Tire (versions)

FIELD: transport.

SUBSTANCE: invention relates to pneumatic tire tread design, predominantly for agricultural vehicles. Tire includes carcass and tread running along circumference of tire carcass, where the mentioned tread contains multiple tread elements located in tread pattern. Tread elements in the mentioned array of tread elements are located with one of two pitches having different lengths and in noise-reducing sequence of pitches.

EFFECT: reduced noise.

36 cl, 5 dwg

 

The technical FIELD

[0001] the Present invention in General relates to tires and, in particular, relates to a tire containing a tread having a pattern of the tread elements arranged in reducing noise sequence of steps.

[0002] the Present invention may find particular application and use in pneumatic tyres for agricultural vehicles (e.g. tractors, harvesters and reaping machines or other machines associated with the agricultural industry, and thus the invention shown and described in this application with particular reference to such cases agricultural use. However, it should be understood that the object of the present invention also applies to a wide class of non-pneumatic tires (for example, solid rubber tires) and is also suitable for a wide variety of other applications and/or uses (for example, in cases of off-road use and forestry). As such a specific reference in this application to pneumatic tires for use in agriculture is only an example and is not a constraint.

[0003] Agricultural machines such as tractors, harvesters and reaping machines, for example, move at increasing distances on the road surface during movement between the is agricultural purpos the agricultural places. To reduce the time of travel of the agricultural machine is becoming more and more speed and capable of rapid movement on the highway (for example, moving at speeds in excess of 65 km/h (40 mph). Because of these and/or other circumstances, the noise and vibration produced by the traditional tires on the specified agricultural and/or other vehicles designed for off-road, while moving on the highway at high speed becomes more and more urgent problem.

[0004] Traditional agricultural and other tires designed primarily for use on the roads, are designed with emphasis on performance, important for the intended use. For example, agricultural tires can be designed with an emphasis on traction properties, the coefficients of voidness tread cleaning characteristics of the tread and/or infiltration into the soil, as well as geometric shapes that increase the mileage of the tyre and its strength.

[0005] for Example, one characteristic of the tread, which is usually associated with the properties of adhesion and sliding wheels, refers to the stiffness of the elements that form the tread of the tire. In particular, the rigidity of the tread elements usually is related to the geometric configuration (i.e. size and shape) of the tread elements. Thus, changes in the size and/or shape of adjacent tread elements lead to corresponding changes of rigidity, which can degrade the performance of the clutch and slide the wheel. As a result, in various designs tires for agricultural purposes and off-road uses a one-step tread pattern, in which each element of the tread is identical to the next element of the tread located on the circumference of the tread pattern.

[0006] In General, it is known the use of a tread of the tire that contains the specified sequence of steps to reduce noise and/or vibrations produced by the tread of the tire during use. This concept is usually taken into consideration when designing a passenger tire (i.e. tires for vehicles intended for the carriage of passengers for which characteristics, such as comfort during the ride and reduced noise and vibration, are significant. However, it should be recognized that the drawings of the protector and the design of the tread element used in the design of passenger tires, in General, are essentially different performance characteristics, unlike characteristics, the priority for agricultural tires or other tires.

[0007] Thus, there are needs of the ü in creating the bus, which contains the protector, reducing noise and/or vibration while providing the necessary performance, usually related to tires used in agricultural and other off-road conditions.

The INVENTION

[0008] One example of a tire according to the present invention may contain the axis of rotation and tread. Protector passes circumferentially around the axis and contains many elements that are located in the tread. The tread elements in the specified set of elements of the tread are arranged with a pitch with one of two different lengths, and these two different step length have a coefficient of the step within the range of from about 1.15 to about 1,40. The tread pattern contains one of the following combinations:

30 steps, of which 17 steps have a first length and 13 steps have a second length;

34 step, of which 19 steps have a first length and 15 steps have a second length;

38 steps, of which 21 has a first length and 17 steps have a second length;

42 step 23 step have a first length and 19 steps have a second length;

46 steps, of which 25 steps have a first length and a 21 step have a second length;

50 steps, of which 28 steps have a first length and 22 step have a second length.

[0009] Another example tires according to the present invention may contain the axis of the rotation is occurring and protector. Protector passes circumferentially around the axis and contains many elements of the tread located in the tread. The tread elements in the specified set of elements of the tread are arranged with a pitch with one of two different lengths, and these two different step length have a coefficient of the step within the range of from about 1.15 to about 1,40. The tread pattern contains one of the following combinations:

31 step 17 of which steps have a first length and 14 steps have a second length;

35 steps, of which 19 steps have a first length and 16 steps have a second length;

39 steps, of which 21 has a first length and 18 steps have a second length;

43 step 24 step have a first length and 19 steps have a second length;

47 steps, 26 of which steps have a first length and a 21 step has a second length.

[0010] an Additional example tires according to the present invention may contain the axis of rotation and tread. Protector passes circumferentially around the axis and contains many elements of the tread located in the tread. The tread elements in the specified set of elements of the tread are arranged with a pitch with one of two different lengths, and these two different step length have a coefficient of the step within the range of from about 1.15 to about 1,40. The tread soda is separated by one of the following combinations:

32 step 18 of which steps have a first length and 14 steps have a second length;

36 steps, 20 steps have a first length and 16 steps have a second length;

40 steps, of which 22 have a first step length and 18 steps have a second length;

44 step 24 step have a first length and 20 steps have a second length;

48 steps, 26 of which steps have a first length and 22 step have a second length.

[0011] Another example of a tire according to the present invention may contain the axis of rotation and tread. Protector passes circumferentially around the axis and contains many elements of the tread located in the tread. The tread elements in the specified set of elements of the tread are arranged with a pitch with one of two different lengths, and these two different step length have a coefficient of the step within the range of from about 1.15 to about 1,40. The tread pattern contains one of the following combinations:

33 step 18 of which steps have a first length and 15 steps have a second length;

37 steps, 20 steps have a first length and 17 steps have a second length;

41 step 23 step have a first length and 18 steps have a second length;

45 steps, of which 25 steps have a first length and 20 steps have a second length;

49 steps, of which 27 steps have a first length and 22 step have a second length.

The QUICK DESCRIPTION of the DRAWINGS

[0012] figure 1 shows a perspective view of one example of a tire according to the present invention, which contains the protector with reducing noise sequence of steps.

[0013] figure 2 shows a view in section of part of the tire shown in figure 1, along the line 2-2.

[0014] figure 3 shows an enlarged view of the tread of the tire shown in figure 1 and 2, along the line 3-3 shown in figure 2, showing features of one example of reducing the noise of the tread pattern according to the present invention.

[0015] figure 4 shows a magnified image of a portion of the protector shown in figure 3, illustrating a portion of one example of reducing the noise of the tread pattern according to the present invention.

[0016] figure 5 shows a graph of the harmonic spectrum obtained by computer-aided modeling, analyzing a specific example tires according to the present invention, shown in comparison with the traditional one-step bus.

DETAILED description of the INVENTION

[0017] the Accompanying drawings are used in this application with the purpose of illustrating examples of implementation of the present invention, but not to its volume. Figure 1-4 shows the pneumatic tire 100 having an axis AH, around which the pneumatic tire is rotated during use. Pneumatic tire 100 includes a frame 102, which pass through the circumferentially around axis AX and has a generally open toroidal shape. Pneumatic tire 100 also includes a protector 104, which is located along the outer circumference of the tire carcass.

[0018] the Pneumatic tire according to the present invention may be of any suitable type, kind, shape and/or design. As shown in figure 2, the frame 102 includes a crown 106, which runs circumferentially around the axis AH. The first sidewall 108 passes radially inner direction from the crown 106 to the first Board 110 and the second sidewall 112, located in the axial direction at a distance from the first sidewall 108, passes radially inner direction from the crown 106 to the second Board 114. Crown 106 together with the first and second side walls 108 and 112 at least partially forms a chamber 116 tyres, suitable for keeping a certain amount of fluid under pressure (e.g. compressed air) in the traditional way, such as, for example, provided by setting the first and second sides 110 and 114 is essentially impermeable to the fluid way on the traditional site of the wheel or rim (not shown).

[0019] it Should be noted that the tire carcass may be of any suitable design (e.g., design with diagonal or radial location of cords), and can be located in any suitable way components and/or elements formed from any podhodyashego the material or combination of materials, known from the prior art. In the arrangement shown in figure 2, for example, the tire carcass 102 includes a housing 118 and belt 120, which runs circumferentially around the casing along the crown 106. The housing 118 includes a core 122 of the first side and the core 124 of the second side, which is located in the axial direction at a distance from the core of the first side. The cores 122 and 124 may be of any suitable design, for example, of conventional construction, containing several turns or coils of wire, forming an infinite loop.

[0020] the Housing 118 of the frame 102 bus also contains at least one layer 126, which passes between the cores 122 and 124. At least one layer of the tire carcass may contain inversions 128, which extend around and cover the cores 122 and 124 of the first and second sides. It should be noted that at least one carcass layer of the tire may be of any suitable design, and may contain any suitable configuration of layers made of suitable materials and/or combinations of materials. For example, at least one of the layers of the tire carcass may contain reinforcing wire 130 and/or at least one of the layers of the tire carcass may contain layers of reinforced material such as, for example, the inner cover layer 132 and the outer covering layer 134.

[0021] As indicated the above, the tire according to the present invention may be of any suitable type and/or species and, as such, may contain a protector of any suitable size, shape, construction and/or location. For example, the tire according to the present invention may contain a tread having a pattern, suitable for agricultural machinery, such as, for example, the tread pattern made by approaching one of the types R1, R1W, R2, R3 or R4. It should be noted that optionally can be used in any other suitable pattern and/or type tread for off-road.

[0022] As shown in Fig.1-4, the protector 104 pneumatic tire 100 passes circumferentially around the frame 102 of the tire in the axial direction between opposite first and second shoulders 136 and 138, through which the whole protector 104 moves in the first and second side walls 108 and 112, respectively. Protector 104 contains several elements or checkers 140, which are located at some distance from each other and thus are separated from each other by empty regions 142. It should be noted that the blank area 142 of the tread may contain open areas of any suitable size and/or shape having any suitable location and/or configuration. For example, a blank area 142 of the protector may include passing around the circumference of the open field and is any at least one of, moreover, these passing around the circumference of the open area sometimes referred to in the prior art as grooves. As another example, a blank area 142 of the protector may include passing in the axial direction of the open area, or any at least one part of it, and mentioned in passing axially open area sometimes referred to in the prior art as gutters.

[0023] in Addition, it should be noted that for items 140 tread and/or blank areas 142 of the tread can be used in any form at least one of an almost infinite diversity of forms and that the forms shown and described in this application are not limiting. As shown in more detail in the configuration example in figure 3, the elements 140 tread have an approximately cross-shaped and include first longitudinal portion 144, an opposing second longitudinal portion 146 located on the circumference at a distance from the first longitudinal side, the first side portion 148 and an opposite second side 150. Additional rounded or curved portion 152 passes between adjacent lateral and longitudinal parts of the tread elements.

[0024] in Addition, several elements of a protector according to the present invention, such as elements 140 tread 104 can be arranged in any pattern of almost infinite variety of figures, which runs around the circumference of the pneumatic tire, and it should be understood that the specific drawing (except for the sequence of steps described below), which is shown and described in this application is only an example. Tread pattern, such as the protector 104, for example, may often contain at least one passing around the circumference of the rows of tread elements, which form an infinite pattern or picture in the form of a closed loop elements of the tread around the outside of the bus.

[0025] In the example arrangement shown in figure 1-4, the elements 140 tread are several circumferential rows which are placed near transversely (i.e. in the axial direction) along the width of the pneumatic tire 100 between the shoulders 136 and 138. Some district located next to each other, figure 3 and 4 show how the district ranks of CR1, CR2 and CR3. If you use at least two circumferential rows of tread elements, the circumferential rows may be transversely located relative to each other in any suitable way. As one example, at least two circumferential series can be transversely located at some distance from each other so that the endless annular groove passes circumferentially around the tread (i.e groove, which runs approximately papamoa line along the tire circumference). As another example, at least two circumferential rows can cross to overlap or otherwise transversely to interact with each other, so infinite, but nikolcheva groove formed between two circumferential rows, runs circumferentially around the tread (i.e., the groove that runs along the curved, wavy, or other indirect line around the circumference of the tire).

[0026] Regardless of the shape and/or pattern of elements that form the tread according to the present invention, at least part of the tread elements has one of two different steps, with which at least one part of the tread elements is located in a circumferential row, passing in a closed loop around the tire in accordance with a given sequence of steps. Used in the present description, the term "step" (which in the prior art can also be known as "the cycle of drawing"), generally interpreted as a section of the tread in the circumferential direction, which is repeated in at least two locations around the outer circumference of the tire. Step typically contains an element of the tread and the adjacent blank area of the tread, which separates the tread element from the next district element of the tire tread, for example, as indicated in figure 4 by the points A1 and A2. Additionally or is under other options implementation step may contain a portion of the first element of the tread, the corresponding residual part of the second tread element and an empty area of the tread located between them, as indicated in figure 4 by the points B1 and B2. Used in the present description, the term "step length" means generally circumferential length of the step. In some cases, the protector may contain elements that are located at a distance of at least two steps, with a corresponding number of at least two of the lengths of the step. The term "coefficient of step" in General means the ratio of the greater length of the step to the lower step length. The term "sequence of steps" in General means a few elements of the tread and adjacent blank areas of the tread (for example, grooves in at least two steps, which are placed in a certain location along the circumference of the tire (i.e. in the circumferential series bus) for forming thereby at least partially tread.

[0027] the tread 104 bus 100 preferably contains elements of the tread having one of only two different steps, which are indicated in figure 3 and 4 as a first step P1 and the second step P2. For the purposes of clarity of description, the first step P1 has a first or shorter length, and the second step P2 is the second or greater length. It should be understood that different lengths of the first and second steps can be achieved by any suitable JV the way. In the example shown in figure 3 and 4, the elements 140A and 140V tread have two different size or two circumferential length TL1 and TL2, respectively (as shown in figure 3). In this case located near empty area of the tread (e.g., trench) can be approximately uniform in width. As another example, the elements of the tread can have essentially the same size or circumferential length with adjacent empty areas of the tread (e.g., grooves)having different width to change the length of two different steps. As an additional example, to change the lengths of the two different steps can be used a combination of the lengths of the tread elements and the widths of the blank areas of the tread (for example, the widths of the grooves).

[0028] If necessary, maintain the properties of adhesion and/or other characteristics of the tire within the desired range of operating characteristics or other reasons can be used first and the second step length for the first and second steps, resulting coefficient may have a value within the range of from about 1.15 to about 1,40. In some cases, you may use the value of the coefficient of the step within the range of from about 1.20 to about 1,24. As a concrete example, for the relationship of the second step length to the first length of the step (i.e. P2/is 1) can be used is approximately 1,22.

[0029] For agricultural and/or other tires, designed for off-road, to which in particular the present invention, can be used tread pattern with 30-50 steps. In addition, such a tread pattern with a number of 30-50 steps preferably formed from a combination of tread elements having one of two different steps, located in the specified sequence. This sequence of steps is used to reduce noise and/or vibration caused by movement of the tread in the surrounding tire air environment and/or the contact elements of the tread and the road surface when the distribution of the energy generated thereby in a wide range of frequencies. As one example, such a pattern may contain at least one district, the number of formed elements of the tread, which has only one of two different steps. In addition, two different step of forming the tread pattern with the number of 30-50 steps, preferably have a length in which the ratio of the pitch is within the range of from about 1.15 to about 1,40.

[0030] as one example, for a tread developed a sequence of 38 steps, which contains 21 step having a first or shorter length (e.g., length P1) of the 17 steps having a second or longer (for example, the length P2). Below is a real example of a sequence of steps to tread, containing 38 steps in which the first step is indicated by one (1), and the second step are indicated by two (2):

1112112112212121221111122222111112222.

[0031] the Above example sequence of steps is an infinite loop or a closed loop of steps, and it should be understood that any element of the step in the sequence may start or end sequence while maintaining essentially of the sequence of steps. In addition, this sequence of steps may help to reduce noise and/or vibration during rotation of the tire in either direction (i.e. clockwise or counterclockwise) around its axis. Thus, it should be understood that the sequence of steps according to the present invention, such as, for example, the above sequence of 38 steps, can also be used in reverse order with any element of the step in the sequence beginning or end of the sequence, while being supported by the specified sequence of steps.

[0032] figure 4 shows a portion of the tread 104, in which the steps indicated by the dashed lines drawn in the axial direction across the tread. Steps, oznaczenie dashed lines, are part of the above sequence of 38 steps, namely, the first four step sequence indicated in figure 4 dimensions P1, P1, P1, P2. In a preferred arrangement each step sequence takes place in the axial direction across the tread, as shown in figure 3 and 4. However, it should be noted that there may be used any other location and/or configuration.

[0033] figure 5 shows the harmonic spectrum, calculated by simulation, which presents the results of the analysis of the 38-step tread, the elements of which are set according to the above sequence. The resulting spectrum of the harmonics shown by the solid line in figure 5, labeled as R. Range of harmonics corresponding to the one-step tread traditional bus presented on figure 5 by the dashed line labeled M From figure 5 it is obvious that the use of the above sequence of steps, such as the 38-step sequence according to the above example, preferably leads to a uniform energy distribution of the noise generated by the bus with the specified pattern in a wide range of frequencies, instead of concentrating in a few harmonic frequencies that occurs when using the raw tire with odnosa the new pattern.

[0034] Also according to the present invention developed other examples of treads for pneumatic tires below. In each of the following examples, the occurrence of the first step are indicated by one (1), and the occurrence of the second step indicated by two (2). In addition, as described above, the following examples of sequences of steps represent an infinite loop or a closed loop of steps, and it should be understood that any element of the sequence can start or finish this sequence, and the sequence can be used in both forward and reverse directions, essentially with the obligatory saving of the order of the steps in the sequence.

[0035] an example of a

The tread pattern can alternately include 30 steps, arranged in sequence, with 17 steps have a first or shorter length (e.g., length P1), and 13 steps have second or extended length (for example, the length P2). Such a set sequence of steps may include first and second steps, arranged in the following order:

122221111122211122111212221111.

[0036] Example Century.

The tread pattern can alternately include 31 step located in the specified sequence, and 17 steps have a first or shorter length (for example, the length of P), and 14 steps have second or extended length (for example, the length P2). Such a set sequence of steps may include first and second steps, arranged in the following order:

1112222121121112221111222121211.

[0037] the Example

The tread pattern can alternately include a 32 step located in the specified sequence, and of these 18 steps have a first or shorter length (e.g., length P1), and 14 steps have second or extended length (for example, the length P2). Such a set sequence of steps may include first and second steps, arranged in the following order:

21111221122221111121122212111221.

[0038] Example D

The tread pattern can alternately include 33 step located in the specified sequence, and of these 18 steps have a first or shorter length (e.g., length P1)and 15 steps have second or extended length (for example, the length P2). Such a set sequence of steps may include first and second steps, arranged in the following order:

112222122111121122211122211221111.

[0039] Example E

The tread pattern can alternately include 34 step located in the specified sequence, and 19 of them steps have a first or shorter length (e.g., length P1)and 15 steps have second or extended length (for example, the length P2). Such a set sequence of steps mo is et to contain the first and second steps, located in the following order:

1122221221111211221211122211221111.

[0040] Example F

The tread pattern can alternately include 35 steps, arranged in sequence, and 19 of them steps have a first or shorter length (e.g., length P1)and 16 steps have second or extended length (for example, the length P2). Such a set sequence of steps may include first and second steps, arranged in the following order:

11111212221112212121122111121222212.

[0041] Example G

The tread pattern can alternately include 36 steps, arranged in sequence, and of these 20 steps to have a first or shorter length (e.g., length P1)and 16 steps have second or extended length (for example, the length P2). Such a set sequence of steps may include first and second steps, arranged in the following order:

111112122221122111121221111222121221.

[0042] the Example N

The tread pattern can alternately include 37 steps, arranged in sequence, and of these 20 steps to have a first or shorter length (e.g., length P1)and 17 steps have second or extended length (for example, the length P2). Such a set sequence of steps may include first and second steps, arranged in the following order:

2221112211112221211112221221211111122.

[0043] Example I

Figure protectorate alternately contain the 39 steps located in the specified sequence, and of those, 21 have a first step or a shorter length (e.g., length P1), and 18 steps have second or extended length (for example, the length P2). Such a set sequence of steps may include first and second steps, arranged in the following order:

222211111212122211121122211122211211112.

[0044] Example J

The tread pattern can alternately include 40 steps, arranged in sequence, and 22 have a first step or a shorter length (e.g., length P1), and 18 steps have second or extended length (for example, the length P2). Such a set sequence of steps may include first and second steps, arranged in the following order:

1111112222211112121221112211221111222212.

[0045] For Example

The tread pattern can alternately include 41 step located in the specified sequence, and of these, 23 have a first step or a shorter length (e.g., length P1), and 18 steps have second or extended length (for example, the length P2). Such a set sequence of steps may include first and second steps, arranged in the following order:

22111112212121122111122221111222111111222.

[0046] Example L

The tread pattern can alternately include 42 step located in the specified sequence, and of these, 23 have a first step or shorter lengths is (for example, the length of P1), and 19 steps have second or extended length (for example, the length P2). Such a set sequence of steps may include first and second steps, arranged in the following order:

111122211221122112112112112222121111122221.

[0047] Example M

The tread pattern can alternately include 43 step located in the specified sequence, and of these, 24 have a first step or a shorter length (e.g., length P1)and 19 steps have second or extended length (for example, the length P2). Such a set sequence of steps may include first and second steps, arranged in the following order:

1222111121122221121111221112222111112221211.

[0048] the Example N

The tread pattern can alternately include 44 step located in the specified sequence, and of these, 24 have a first step or a shorter length (e.g., length P1)and 20 steps have second or extended length (for example, the length P2). Such a set sequence of steps may include first and second steps, arranged in the following order:

22222111121212111222211111222121122211112111.

[0049] an Example Of

The tread pattern can alternately include 45 steps, arranged in sequence, with 25 steps have a first or shorter length (e.g., length P1)and 20 steps have second or extended length (for example, the length P2). This was defined by sledovatelnot steps may include first and second steps, located in the following order:

112222211111221121212211112221211112212221111.

[0050] Example R

The tread pattern can alternately include 46 steps, arranged in sequence, with 25 steps have a first or shorter length (e.g., length P1)and 21 step have a second or extended length (for example, the length P2). Such a set sequence of steps may include first and second steps, arranged in the following order:

2122211111122221211121212111222211211112221112.

[0051] Example Q

The tread pattern can alternately include 47 steps, arranged in sequence, and of these 26 steps have a first or shorter length (e.g., length P1)and 21 step have a second or extended length (for example, the length P2). Such a set sequence of steps may include first and second steps, arranged in the following order:

1221111222111112222211111222122111211211221221.

[0052] Example R

The tread pattern can alternately include 48 steps, arranged in sequence, and of these 26 steps have a first or shorter length (e.g., length P1)and 22 step have a second or extended length (for example, the length P2). Such a set sequence of steps may include first and second steps, arranged in the following order:

122111222111112222211111122221122112121111222211.

[0053] Example S

R is sunok protector may in turn contain 49 steps, located in the specified sequence, and of these 27 steps have a first or shorter length (e.g., length P1)and 22 step have a second or extended length (for example, the length P2). Such a set sequence of steps may include first and second steps, arranged in the following order:

1221112221111122222111111212221122112121111222211.

[0054] Example T

The tread pattern can alternately include 50 steps, arranged in sequence, and 28 steps have a first or shorter length (e.g., length P1)and 22 step have a second or extended length (for example, the length P2). Such a set sequence of steps may include first and second steps, arranged in the following order:

21222111122221211121211211121212211111222111221211.

[0055] in the present description to designate certain elements, components and/or structures (e.g., "first district" and "the second district a number”) ordinal numbers simply represent "different" single elements and do not imply any order or sequence, if the claim is not specifically specified otherwise.

[0056] Although the present invention has been described above with specific implementation options and the main attention was paid to the above structures and structural interrelationships between the component and the described implementation options, it should be understood that can be used in other embodiments, as shown and described above implementations can be made of various modifications without departure from the principles of the present invention. For professionals these modifications and changes will be apparent upon reading and understanding the preceding detailed description. Accordingly, it should clearly be understood that the foregoing description shall be interpreted solely as an illustration, but not limitation. Thus, an object of the present invention should be considered as including all such modifications and changes as they remain within the points of the applied formulas and any equivalents.

1. A tire having an axis of rotation, comprising:
protector passing circumferentially around the specified axis and containing many elements of the tread located in the tread with one of two different step lengths, and these two different step length have a coefficient of the step within the range of from about 1.15 to about 1,40, and the specified pattern contains one of the following combinations:
30 steps, of which 17 steps have a first length and 13 steps have a second length;
34 step, of which 19 steps have a first length and 15 steps have a second length;
38 steps, of which the s 21 has a first length and 17 steps have a second length;
42 step 23 step have a first length and 19 steps have a second length;
46 steps, of which 25 steps have a first length and a 21 step has a second length;
50 steps, of which 28 steps have a first length and 22 step have a second length.

2. The tire according to claim 1, in which the specified pattern contains at least one passing around the circumference of a number of elements of the tread containing 30 steps, of which 17 steps have a first length and marked "1", 13 steps have a second length and marked "2", and the above steps are according to the following sequence of steps: 122221111122211122111212221111.

3. The tire according to claim 1, in which the specified pattern contains at least one passing around the circumference of a number of elements of the tread containing 34 step, of which 19 steps have a first length and marked "1" and 15 steps have a second length and marked "2", and the above steps are according to the following sequence of steps: 1122221221111211221211122211221111.

4. The tire according to claim 1, in which the specified pattern contains at least one passing around the circumference of a number of elements of the tread, containing 38 steps, of which 21 has a first length and marked "1" and 17 steps have a second length and marked "2", and the above steps are according to the following sequence of steps: 11121121122121212211111222221111112222.

5. The tire according to claim 1, in which asany tread pattern contains at least one passing around the circumference of a number of elements of the tread, containing 42 step 23 step have a first length and marked "1" and 19 steps have a second length and marked "2", and the above steps are according to the following sequence of steps: 111122211221122112112112112222121111122221.

6. The tire according to claim 1, in which the specified pattern contains at least one passing around the circumference of a number of elements of the tread containing 46 steps, of which 25 steps have a first length and marked "1" and 21 step has a second length and is marked "2", and the above steps are according to the following sequence of steps: 2122211111122221211121212111222211211112221112.

7. The tire according to claim 1, in which the specified pattern contains at least one passing around the circumference of a number of elements of the tread containing 50 steps, of which 28 steps have a first length and marked "1" and 22 step have a second length and marked "2", and the above steps are according to the following sequence of steps: 21222111122221211121211211121212211111222111221211.

8. A tire having an axis of rotation, comprising:
protector passing circumferentially around the specified axis and containing many elements of the tread located in the tread with one of two different step lengths, and these two different step length have a coefficient of the step within the range of from about 1.15 to about 1,40, and the specified pattern tread, and manual is and contains one of the following combinations:
31 step 17 of which steps have a first length and 14 steps have a second length;
35 steps, of which 19 steps have a first length and 16 steps have a second length;
39 steps, of which 21 has a first length and 18 steps have a second length;
43 step 24 step have a first length and 19 steps have a second length;
47 steps, 26 of which steps have a first length and a 21 step has a second length.

9. The tire of claim 8, in which the specified pattern contains at least one passing around the circumference of a number of elements of the tread, containing 31 step 17 of which steps have a first length and marked "1" and 14 steps have a second length and marked "2", and the above steps are according to the following sequence of steps: 1112222121121112221111222121211.

10. The tire of claim 8, in which the specified pattern contains at least one passing around the circumference of a number of elements of the tread containing 35 steps, of which 19 steps have a first length and marked "1" and 16 steps have a second length and marked "2", and the above steps are according to the following sequence of steps: 11111212221112212121122111121222212.

11. The tire of claim 8, in which the specified pattern contains at least one passing around the circumference of a number of elements of the tread containing the 39 steps, of which 21 has a first length and marked "1" and 18 steps Deut have the Yu long and marked "2", and these steps are according to the following sequence of steps: 222211111212122211121122211122211211112.

12. The tire of claim 8, in which the specified pattern contains at least one passing around the circumference of a number of elements of the tread containing 43 step 24 step have a first length and marked "1" and 19 steps have a second length and marked "2", and the above steps are according to the following sequence of steps: 122211121122221121111221112222111112221211.

13. The tire of claim 8, in which the specified pattern contains at least one passing around the circumference of a number of elements of the tread containing 47 steps, of which 26 have a first step length and marked "1" and 21 step has a second length and is marked "2", and the above steps are according to the following sequence of steps: 12211112221111122222111111222122111211211221221.

14. A tire having an axis of rotation, comprising:
protector passing circumferentially around the specified axis and containing many elements of the tread located in the tread with one of two different step lengths, and these two different step length have a coefficient of the step within the range of from about 1.15 to about 1,40, and the specified pattern contains one of the following combinations:
32 step 18 of which steps have a first length and 14 steps have a second length;
36 Agov, 20 of these steps have a first length and 16 steps have a second length;
40 steps, of which 22 have a first step length and 18 steps have a second length;
44 step 24 step have a first length and 20 steps have a second length;
48 steps, 26 of which steps have a first length and 22 step have a second length.

15. The bus 14, in which the specified pattern contains at least one passing around the circumference of a number of elements of the tread containing 32 step 18 of which steps have a first length and marked "1", 14 steps have a second length and marked "2", and the above steps are according to the following sequence of steps: 2111122112222111112122212111221.

16. The bus 14, in which the specified pattern contains at least one passing around the circumference of a number of elements of the tread, containing 36 steps, 20 steps have a first length and marked "1", 16 steps have a second length and marked "2", and the above steps are according to the following sequence of steps: 111112122221122111121221111222121221.

17. The bus 14, in which the specified pattern contains at least one passing around the circumference of a number of elements of the tread containing 40 steps, of which 22 have a first step length and marked "1", 18 steps have a second length and marked "2", and the above steps are according to the following PEFC is the sequences of steps: 1111112222211112121221112211221111222212.

18. The bus 14, in which the specified pattern contains at least one passing around the circumference of a number of elements of the tread containing 44 step 24 step have a first length and marked "1", 20 steps have a second length and marked "2", and the above steps are according to the following sequence of steps: 22222111121212111222211111222121122211112111.

19. The bus 14, in which the specified pattern contains at least one passing around the circumference of a number of elements of the tread containing 48 steps, 26 of which steps have a first length and marked "1", 22 step have a second length and marked "2", and the above steps are according to the following sequence of steps: 122111222111112222211111122221122112121111222211.

20. A tire having an axis of rotation, comprising:
protector passing circumferentially around the specified axis and containing many elements of the tread located in the tread with one of two different step lengths, and these two different step length have a coefficient of the step within the range of from about 1.15 to about 1,40, and the specified pattern contains one of the following combinations:
33 step 18 of which steps have a first length and 15 steps have a second length;
37 steps, 20 steps have a first length and 17 steps have a second length;
41 step 23 step is to have a first length and 18 steps have a second length;
45 steps, of which 25 steps have a first length and 20 steps have a second length;
49 steps, of which 27 steps have a first length and 22 step have a second length.

21. The tire according to claim 20, in which the specified pattern contains at least one passing around the circumference of a number of elements of the tread containing 33 steps, 18 of which steps have a first length and marked "1", 15 steps have a second length and marked "2", and the above steps are according to the following sequence of steps: 11222212211112112221112221122111 1.

22. The tire according to claim 20, in which the specified pattern contains at least one passing around the circumference of a number of elements of the tread containing 37 step 20 of these steps have a first length and marked "1", 17 steps have a second length and marked "2", and the above steps are according to the following sequence of steps: 2221112211112221211112221221211111122.

23. The tire according to claim 20, in which the specified pattern contains at least one passing around the circumference of a number of elements of the tread, containing 41 step 23 step have a first length and marked "1" 18 steps have a second length and marked "2", and the above steps are according to the following sequence of steps: 22111112212121122111122221111222111111222.

24. The tire according to claim 20, in which the specified pattern contains at least one passing the second circumference, the number of elements of the tread, containing 45 steps, of which 25 steps have a first length and marked "1", 20 steps have a second length and marked "2", and the above steps are according to the following sequence of steps: 112222211111221121212211112221211112212221111.

25. The tire according to claim 20, in which the specified pattern contains at least one passing around the circumference of a number of elements of the tread containing 49 steps, of which 27 steps have a first length and marked "1", 22 step have a second length and marked "2", and the above steps are according to the following sequence of steps: 1221112221111122222111111212221122112121111222211.

26. Tire according to any one of claims 1 to 25, in which the specified ratio of the pitch is within the range of from about 1.20 to about 1,24.

27. Tire according to any one of claims 1 to 25, in which the specified pattern is a pattern for agricultural vehicles, having a configuration similar to one of the following types: R1, R1W, R2, R3, and R4.

28. The tire according to item 27, in which a specified set of elements of the tread contains the set of first elements of the tread and many of the second tread elements, and these first tread elements are approximately the same and the specified second tread elements are approximately equal.

29. Tire according to any one of claims 1 to 25, in which asanee many elements of the tread contains the first set of elements of the tread, passing circumferentially around the specified axis in a first circumferential row, and the second set of elements of the tread, passing circumferentially around the specified axis in the second circumferential row, located next to the specified first district near.

30. The tire according to clause 29, in which the tread elements in said first and second sets are arranged with the first step of a specified sequence of steps, and the first step of the specified first set of tread elements aligned circumferentially with respect to the specified first step, the specified second set of elements of a protector.

31. The tire according to item 30, in which the first step of the specified first set of elements of the tread contains essentially all of the first tread element and essentially all of the first blank area of the tread located on the circle next to the specified first tread element.

32. The tire according to item 30, in which the first step of the specified first set of elements of the tread contains a portion of the first element of the tread corresponding to the residual part of the second tread element located around the circumference near the selected first element of the tread, and essentially the entire blank area of the tread located between the first and second elements of a protector.

33. Tire according to any one of claims 1 to 25, in which the specified set of elements of the tread has one of only two different lengths of the step.

34. Tire according to any one of claims 1 to 25, further containing casing of the tire, passing circumferentially around the specified axis at least partially forming a pneumatic chamber and containing:
two core Board, located in the axial direction at a distance from each other; and
the body of the bus, in the working position is attached between the two cores of the Board, containing the crown and two located in the axial direction at a distance from each other of the side walls connecting the specified crown with specified bead cores.

35. The bus 34, in which the specified protector passes circumferentially around the specified tire casing along at least part of this crown.

36. The bus 34, in which the specified tyre body contains a layer with diagonal arrangement of cords and/or the layer with the radial location of cords.



 

Same patents:

FIELD: transport.

SUBSTANCE: invention relates to tread of tires to be used in winter. Winter tire (1) has tread (2) with relied patter composed of multiple lengthwise grooves (4) and crosswise grooves (5) isolating the blocks (6) extending radially from base surface (3) of tread (2) to make at least one lengthwise row. Every block (6) has two lengthwise lateral surfaces (7) that make the boundaries of two appropriate lengthwise grooves (4) and two crosswise side surfaces (8) that make the boundaries of two appropriate crosswise grooves (5). At least one of units (6) has lateral channels (9) each being formed at side surface (7, 8) of appropriate block (6) to extend from base surface (3) of tread (2) to top surface (10) of block (6) to prevent radial extension of trapped snow from inner section of lateral channel (9).

EFFECT: perfected grip and snow-clad roads.

19 cl, 16 dwg

Pneumatic tire // 2525187

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, namely, to studless tire tread pattern. Tire (1) tread (2) has several (5R) crown blocks (5b) separated by crosswise crown grooves (8), two rows (6R) of mid blocks (6b) separated by mid crosswise grooves (9) and two rows (7R) of shoulder blocks (7b) separated by shoulder crosswise groves (10). Every crown crosswise groove (8) is level in lengthwise direction with one crosswise crown mid groove (9) so that crosswise groove (8) is located in area (Mc) of the mid crosswise groove confined by 1st and 2nd crosswise straight lines (Za and Zb). The latter extend through 1st and 2nd extreme ends (9a, 9b) of the mid crosswise groove (9), respectively. Longitudinal length of crosswise mid groove are (Mc) makes at least 25% but not over 50% of pitch length (P) confined by 1st extreme ends (9a, 9b). Are (Mc) of mid crosswise groove does not overlap anyone shoulder crosswise groove (10).

EFFECT: better bite.

8 cl, 7 dwg, 1 tbl

Pneumatic tire // 2523539

FIELD: transport.

SUBSTANCE: pneumatic tire 1 having excellent snow-running characteristics while keeping control stability and resistance to uneven wear, including tread 2 containing a pair of longitudinal crown grooves running continuously in longitudinal direction of tire at both sides of tire equator C and having edges, where one edge 3m runs in zigzag fashion, so that L-shaped sections 3s of groove edge are continuously interconnected in tire longitudinal direction, and the other edge 3n runs in corrugated manner so that arc-shaped sections of groove edge 3o having arc-shaped convexity towards groove centre are continuously interconnected in tire longitudinal direction where each section 3s of L-shaped groove edge includes long portion 3c inclined at angle of 1 to 20° relative to longitudinal direction, and short portion 3t with longitudinal length less than this value for long portion 3c and inclined in direction opposite to direction of the mentioned long portion 3c relative to longitudinal direction.

EFFECT: improved characteristics.

17 cl, 1 tbl, 10 dwg

FIELD: transport.

SUBSTANCE: tire tread has at least two wearing plies including outer wearing ply and at least one inner wearing ply located at mid tread under outer wearing ply, and at least one outer groove located in outer wearing ply. Besides, said tread features volumetric cavity ratio of 0.25-0.40 in sound state and of about 0.25-0.40 in worn-out state. External side interacting with ground extends along one of inner wearing ply in worn-out tread. Additionally, said tread features contact surface ratio of 0.66-0.72 in sound state and of about 0.56-0.66 in worn-out state.

EFFECT: enhanced performances.

15 cl, 19 dwg

Pneumatic tire // 2521052

FIELD: transport.

SUBSTANCE: invention relates to tread pattern of automobile non-spiked tire with improved noise characteristics. Pneumatic tire includes axially-internal lengthwise rows of crown blocks which rows are located at each side of tire equator, and axially-external lengthwise rows of shoulder blocks which rows are located axially to the outside of axially-internal lengthwise rows. Crown blocks are longitudinally separated by the first and the second interleaving transverse grooves of the crown. Shoulder blocks are longitudinally separated by the first and the second interleaving transverse shoulder grooves. The first transverse shoulder grooves have width of not less than 3.5 mm. The first transverse crown grooves have width of not less than 2.0 mm. The second transverse shoulder grooves include axially-internal slit-shaped portion with width of 0.5 to 2.0 mm and axially-external main portion at least 3.5 mm wide. The second transverse crown grooves include axially-internal slit-shaped portion with width of 0.5 to 2.0 mm and axially-external main portion at least 2.0 mm wide.

EFFECT: better tire noise characteristics without impairment of running characteristics over snow-covered road surface.

9 cl, 5 dwg, 1 tbl

Automotive tire // 2521033

FIELD: transport.

SUBSTANCE: invention relates to automotive winter tire tread design. Tire (1) has tread (2) containing central part (L1) covering from two sides the equatorial plane (7), and two shoulder parts. The central part (L1) is separated from shoulder parts (L2, L3) of tread by two first circumferential grooves (3, 6). At least two second circumferential grooves (4, 5) are located in the central part (L1). The second circumferential grooves (4, 5) determine margins of the central circumferential bar (10) containing multiple sipes (20) located in parallel to each other and at certain distance from each other. The second circumferential grooves (4, 5) have a mid line running as peak-to-valley scallops throughout tire length in direction along circumference. The mid lines with peak-to-valley scallops are mainly matching in phase with each other throughout tire length (1) in direction along circumference.

EFFECT: better operational properties when moving both over snowy and dry and wet road surfaces.

20 cl, 4 dwg, 1 tbl

Pneumatic tire // 2520265

FIELD: machine building.

SUBSTANCE: proposed tire comprises tread zone (A) located from vehicle inner side and tread zone (B) located on vehicle outer side. There are multiple slot-like drain grooves (32A, 32B) extending over tire width and formed in every block (31A, 31B). The number of blocks (31A) in said zone (A) is larger than that of blocks (31B) in said zone (B). Note here that slot-like drain grooves (32B) in blocks (31B) of zone (B) are configured to extend linearly along their depth. Note here that slot-like drain grooves (32A) in blocks (31A) of zone (A) are configured to extend in wavy manner along their depth.

EFFECT: better road grip on dry road and snow.

7 cl, 4 dwg

Pneumatic tire // 2520265

FIELD: machine building.

SUBSTANCE: proposed tire comprises tread zone (A) located from vehicle inner side and tread zone (B) located on vehicle outer side. There are multiple slot-like drain grooves (32A, 32B) extending over tire width and formed in every block (31A, 31B). The number of blocks (31A) in said zone (A) is larger than that of blocks (31B) in said zone (B). Note here that slot-like drain grooves (32B) in blocks (31B) of zone (B) are configured to extend linearly along their depth. Note here that slot-like drain grooves (32A) in blocks (31A) of zone (A) are configured to extend in wavy manner along their depth.

EFFECT: better road grip on dry road and snow.

7 cl, 4 dwg

Pneumatic tire // 2519327

FIELD: transport.

SUBSTANCE: method is executed by means of making multiple wave-shaped grooves (20) in central belt (16) of tread between two ring grooves (14) located with tilt relative to equatorial plane of tire and consisting of central small elements (26) equatorial plane CL and side small elements (28) at two sides of this equatorial plane. In each of side small elements (28), the second transversal groove (40) is made containing wide area (42) and narrow area (44). Reducing fragmentation of rubber and cracking in side small elements (28) is achieved due to formation of area (54) with raised bottom on periphery of the first acute-angled area (50) and formation of the first bevelled area (56A) on sharp end of the first acute-angled area (50).

EFFECT: lower noise level, rubber fragmentation and cracking in tread elements, higher dewatering capability.

4 cl, 3 tbl, 13 dwg

Pneumatic tire // 2508996

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, namely, to tread pattern. Proposed tire comprises multiple circular main grooves extending in tire circumference and multiple running surfaces separated and composed by said circular main grooves in tread zone. Multiple running sections have multiple sipes. At least 90% of sipes located in inner side area represent are 2D sipes and at least 90% of sipes in outer side surface are 3D sipes. Tread zone comprises top and bottom rubber layers. Rubber hardness H1in at -10°C and rubber hardness H2in at 20°C of rubber top layer 151in in inner side area, and hardness H1out at -10°C and hardness H2out at 20°C of rubber top layer 151out in outer side area are related by relationships H1in<H1out and H2in<H2out.

EFFECT: better stability on dry and snowy surface.

18 cl, 9 dwg

Pneumatic tire // 2525187

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, namely, to studless tire tread pattern. Tire (1) tread (2) has several (5R) crown blocks (5b) separated by crosswise crown grooves (8), two rows (6R) of mid blocks (6b) separated by mid crosswise grooves (9) and two rows (7R) of shoulder blocks (7b) separated by shoulder crosswise groves (10). Every crown crosswise groove (8) is level in lengthwise direction with one crosswise crown mid groove (9) so that crosswise groove (8) is located in area (Mc) of the mid crosswise groove confined by 1st and 2nd crosswise straight lines (Za and Zb). The latter extend through 1st and 2nd extreme ends (9a, 9b) of the mid crosswise groove (9), respectively. Longitudinal length of crosswise mid groove are (Mc) makes at least 25% but not over 50% of pitch length (P) confined by 1st extreme ends (9a, 9b). Are (Mc) of mid crosswise groove does not overlap anyone shoulder crosswise groove (10).

EFFECT: better bite.

8 cl, 7 dwg, 1 tbl

Pneumatic tire // 2524522

FIELD: transport.

SUBSTANCE: invention relates to vehicle tread pattern. Pneumatic tire (1) contains tread (2) which includes projections (23) formed by longitudinal grooves made in longitudinal direction of tire and by transversal grooves (24) crossing longitudinal grooves. The transversal grooves (24) in longitudinal direction of tire form multiple pitches (P1, P2 and P3) of tread pattern. In this structure, in the tread (2) shoulder, as tread pattern pitch decreases the volume ratio of transversal grooves (24) in the volume of portion corresponding to tread pattern pitch increases, and in the central zone of tread (2), as tread pattern pitch decreases the volume ratio of transversal grooves in the volume of portion corresponding to tread pattern pitch decreases.

EFFECT: higher stability of vehicle driving while keeping tread uniformity.

4 cl, 5 dwg

Pneumatic tire // 2523539

FIELD: transport.

SUBSTANCE: pneumatic tire 1 having excellent snow-running characteristics while keeping control stability and resistance to uneven wear, including tread 2 containing a pair of longitudinal crown grooves running continuously in longitudinal direction of tire at both sides of tire equator C and having edges, where one edge 3m runs in zigzag fashion, so that L-shaped sections 3s of groove edge are continuously interconnected in tire longitudinal direction, and the other edge 3n runs in corrugated manner so that arc-shaped sections of groove edge 3o having arc-shaped convexity towards groove centre are continuously interconnected in tire longitudinal direction where each section 3s of L-shaped groove edge includes long portion 3c inclined at angle of 1 to 20° relative to longitudinal direction, and short portion 3t with longitudinal length less than this value for long portion 3c and inclined in direction opposite to direction of the mentioned long portion 3c relative to longitudinal direction.

EFFECT: improved characteristics.

17 cl, 1 tbl, 10 dwg

FIELD: transport.

SUBSTANCE: tire has tread (1) including at least one groove (3) of circular orientation and multiple raised elements (21, 22). Note here that every said raised element comprises contact side (11) with crosswise width Lt and lateral walls (210). Note also that there is at least one raised element with multiple noise killing devices. Note that every said device has elongated cavity (4) of total volume Vc to open toward lateral wall (210). Note that said cavity features total length Lc larger than said length Lt and geometry that includes several interconnected parts (40, 41, 42, 43, 44, 45). Note also that length Lc makes the sum of parts of said cavity. Note that every said cavity (4) extends over the entire length Lc with notch (5) extending radially outward out to rolling surface. Note that sum tread sum Ly of lengths in projection in crosswise direction of every cavity is at least 1.5 times larger than the sum Lx of length in projection if the cavity circumferential direction.

EFFECT: perfected noise killing.

9 cl, 8 dwg

Automotive tire // 2521033

FIELD: transport.

SUBSTANCE: invention relates to automotive winter tire tread design. Tire (1) has tread (2) containing central part (L1) covering from two sides the equatorial plane (7), and two shoulder parts. The central part (L1) is separated from shoulder parts (L2, L3) of tread by two first circumferential grooves (3, 6). At least two second circumferential grooves (4, 5) are located in the central part (L1). The second circumferential grooves (4, 5) determine margins of the central circumferential bar (10) containing multiple sipes (20) located in parallel to each other and at certain distance from each other. The second circumferential grooves (4, 5) have a mid line running as peak-to-valley scallops throughout tire length in direction along circumference. The mid lines with peak-to-valley scallops are mainly matching in phase with each other throughout tire length (1) in direction along circumference.

EFFECT: better operational properties when moving both over snowy and dry and wet road surfaces.

20 cl, 4 dwg, 1 tbl

Pneumatic tire // 2520265

FIELD: machine building.

SUBSTANCE: proposed tire comprises tread zone (A) located from vehicle inner side and tread zone (B) located on vehicle outer side. There are multiple slot-like drain grooves (32A, 32B) extending over tire width and formed in every block (31A, 31B). The number of blocks (31A) in said zone (A) is larger than that of blocks (31B) in said zone (B). Note here that slot-like drain grooves (32B) in blocks (31B) of zone (B) are configured to extend linearly along their depth. Note here that slot-like drain grooves (32A) in blocks (31A) of zone (A) are configured to extend in wavy manner along their depth.

EFFECT: better road grip on dry road and snow.

7 cl, 4 dwg

Pneumatic tire // 2519327

FIELD: transport.

SUBSTANCE: method is executed by means of making multiple wave-shaped grooves (20) in central belt (16) of tread between two ring grooves (14) located with tilt relative to equatorial plane of tire and consisting of central small elements (26) equatorial plane CL and side small elements (28) at two sides of this equatorial plane. In each of side small elements (28), the second transversal groove (40) is made containing wide area (42) and narrow area (44). Reducing fragmentation of rubber and cracking in side small elements (28) is achieved due to formation of area (54) with raised bottom on periphery of the first acute-angled area (50) and formation of the first bevelled area (56A) on sharp end of the first acute-angled area (50).

EFFECT: lower noise level, rubber fragmentation and cracking in tread elements, higher dewatering capability.

4 cl, 3 tbl, 13 dwg

FIELD: transport.

SUBSTANCE: tread contains multiple grooved obstructing elements (4) which are formed by and located in circular grooves (2). Herewith, obstructing elements (4) go from bottom (21) of circular groove (2) and blocks at least 70% of cross-section area of circular groove (2). Bending parameter of grooved obstructing elements (4) is determined as E·I/(h3l), where E is module at 10% elongation of material used for grooved obstructing elements, I is inertia moment of grooved obstructing element cross-section, h is height of grooved obstructing element, and l is width of grooved obstructing element, and ranges from 250 Pa to 350 Pa.

EFFECT: providing grooved obstructing elements wear to degree equivalent to tread section wear degree while reducing noise caused by resonance of air columns and maintaining retraction characteristics.

6 cl, 6 dwg, 1 tbl

Pneumatic tire // 2513210

FIELD: transport.

SUBSTANCE: invention relates to tread pattern of tire designed to be used on dry road, ice- and snow-covered roads. Proposed tire comprises unidirectional tread pattern including right and left lengthwise grooves of the crown and crow rib arranged there between. Crown rib has first and second V-like grooves arranged by turns in the tire lengthwise direction. First V-like grooves extend from the left lengthwise groove of the crown. Second V-like grooves extend from the right lengthwise groove of the crown. First and second V-like grooves terminate nearby the rib while their V-like configurations have inflections located, in fact, at tire equator.

EFFECT: stable motion on dry road, ice- and snow-covered roads.

9 cl, 10 dwg, 1 tbl

Pneumatic tire // 2508996

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, namely, to tread pattern. Proposed tire comprises multiple circular main grooves extending in tire circumference and multiple running surfaces separated and composed by said circular main grooves in tread zone. Multiple running sections have multiple sipes. At least 90% of sipes located in inner side area represent are 2D sipes and at least 90% of sipes in outer side surface are 3D sipes. Tread zone comprises top and bottom rubber layers. Rubber hardness H1in at -10°C and rubber hardness H2in at 20°C of rubber top layer 151in in inner side area, and hardness H1out at -10°C and hardness H2out at 20°C of rubber top layer 151out in outer side area are related by relationships H1in<H1out and H2in<H2out.

EFFECT: better stability on dry and snowy surface.

18 cl, 9 dwg

FIELD: transport.

SUBSTANCE: invention relates to car tires suitable for sportsters. Tire comprises tread divided by tire mid surface into first semi-tread (41) extending axially from mid surface to tread first edge (45). Note here that first semi-tread includes the primary circumferential groove (141) opening to rolling surfaces. Besides, tire includes semi-tread (42) extending axially from mid surface to tread second edge (46). Additionally, tire includes extra stiffener (151) composed of multiple radially-oriented thread-like reinforcing elements. Note here that said extra stiffener is located in radial direction from carcass reinforcing element inner side and levelled directly in radial direction relative to the primary circumferential groove.

EFFECT: more uniform wear, longer life, higher stiffness of tire crown zone.

9 cl, 18 dwg

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