Pneumatic tire tread

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

 

The technical field

The present invention relates to a tread for pneumatic tires and, in particular, relates to a tread for a pneumatic tire, which can be supported features water drainage and noise caused by resonance of the pillars of the air can be reduced through education drain blocking elements in circumferential grooves in the tread, can be provided with wear drain blocking elements to the degree equivalent to the degree of wear of the site protector.

The level of technology

The noise caused by the resonance poles of air in circumferential grooves formed in the tread of the tire, as a result of resonance in the tube (air column), formed by a circumferential groove and the road surface, and the resonance frequency depends on the length of the air column formed between the circumferential groove and the road surface.

This noise caused by resonance of the pillars of the air, is manifested in the form of noise inside and outside the vehicle, and its peak often occurs when the frequency component of approximately 1 kHz, and the noise easily reaches the human ear. As a method of reducing noise caused by resonance of the columns of air in the circumferential grooves, known noise reduction by interrupting the air flow in the direction in which the image of the van circumferential groove, by performing so-called drain blocking elements, in other words, protrusions that run from the bottom or walls of a circumferential groove, blocking the entire circumferential groove or most of circumferential grooves. However, the interruption of the air flow in the direction in which the formed ring groove, also causes an interruption in the ring groove of the flow of water that enters the ring groove when driving on the wet surface of the road, and due to the deterioration of water diversion, located between the pneumatic tire and the road surface stability when running on surfaces wet roads is reduced.

Figure 4 of the patent document 1 discloses a technical solution aimed at ensuring as water drainage and reduce noise caused by resonance of the pillars of the air, by posting in the ring groove of the three drain blocking elements arranged at a certain distance from each other and passing respectively from the bottom of the groove and the opposite walls of the groove within the groove.

In addition, figure 3 of the patent document 2 discloses a technical solution aimed at ensuring as water drainage and reduce noise caused by resonance of the pillars of the air, by placing drain blocking elements, which pass from the bottom of the district karakitai way what most of them from the aperture ring groove does not touch the walls of the grooves.

Patent documents

Patent document 1: Japan Patent Kokai 1999-105511; and

Patent document 2: Japan Patent Kokai 2006-341655.

Problems, the solution of which the invention is directed

However, when using the technical solutions disclosed in the above patent document 1 and patent document 2, to ensure the functioning of drain blocking elements drain blocking elements are made narrow in the circumferential direction of the tire and are easily deformed, but there are problems associated with the fact that depending on the material used drain blocking elements, which are easily deformed, not subject to rapid deterioration under repeated bringing them into action, when this occurs the difference between the amount of wear drain blocking element and the magnitude of the wear area of the tread, and the drain blocking element will act on the area of the tread, and drain blocking element will strike the surface of the road, creating an abnormal noise. The occurrence of such abnormal noise contradicts the basic role of drain blocking element described above, namely noise reduction due to the decrease were the ins noise, caused by resonance of the pillars of the air. There is also the problem consists in the fact that due to the fact that drain blocking element acts on the area of the tread, unintended side drain blocking element is fixed in the ground contact and are subject to wear, and drain blocking the item is damaged when you bring it into action.

In conclusion, it should be noted that the present invention is intended to solve problems faced when using the solutions in the prior art described above, and the present invention is to develop a pneumatic tire, in which may be provided with wear drain blocking elements to the extent equivalent to the wear area of the tread, while reducing noise caused by resonance of the pillars of the air, and maintaining the characteristics of the row.

Means of solving problems

To solve the above task, the present invention is a tread for a pneumatic tire having at least one circumferential groove having a bottom portion and opposing sidewalls, at least two ribs adjacent to the circumferential groove, and plenty of drain blocking elements formed in at least one circumferential groove so that is the circumferential groove is interrupted, and drain blocking elements are formed so that they pass from the lower part of the circumferential grooves in the direction perpendicular to the axis of rotation of the tire so that there are gaps between the drain blocking elements and walls, and at least 70% of the cross sectional area of the circumferential groove, in which the mentioned drain blocking elements are formed, is blocked, and the option of bending drain blocking elements, defined as

EIh3l,

where E is the elastic modulus at elongation at 10% of the material used for drain blocking elements, I is the moment of inertia of the cross section of drain blocking element, h is the height of drain blocking element and l is the width of the drain blocking element at least equal to 250 PA and equal to at most 350 PA.

In the present invention configured thus, the drain blocking elements which are formed so that they pass in the radial direction of the tire inside circumferential grooves on its lower part, and that block at least 70% of the cross sectional area of the circumferential grooves provide a change in the length of the air article the forehead, formed between the circumferential groove and the road surface, in comparison with a case in which the drain blocking elements are not formed, and it is easy to shift the peak of the resonance poles of air from the frequency range, which can easily reach the human ear, and the noise caused by resonance of the pillars of the air decreases.

In addition, in the present invention, the configuration is such that the curl parameter drain blocking elements, defined as E·I/(h3l)equal to at most 350 PA, and thus, drain blocking elements are deformed under the action of water pressure, which gets in the ring groove, and may be provided with drainage of water from the ring grooves. In other words, if the parameter of the curve of drain blocking elements exceeds 350 PA, then drain blocking elements become less susceptible to deformation under the action of the pressure of the water that got into the circumferential grooves, and thus, characteristics of drainage impaired.

In addition, in the present invention, the configuration is such that the curl parameter drain blocking elements, defined as E·I/(h3l)equal to at least 250 PA, and thus, when the drain blocking element is in direct contact with the road surface when the passage h is cut the imprint area of the tread when the tire's rolling, there is a possibility of establishment of proper contact pressure between the road surface and drain blocking element without excessive bending that takes place when the distal end portion of the drain blocking element is in contact with the road surface and is subjected to reaction forces, and the result may be provided with wear drain blocking element to the extent equivalent to the amount of wear of the site protector, which has at least two ribs. In other words, if the parameter of the curve of drain blocking elements is less than 250 PA, then drain blocking elements bent under the force of the reaction, when they are in contact with the road surface, the proper contact pressure cannot be generated between the road surface and drain blocking element, and thus, it is impossible to provide wear drain enclosing element to the degree equivalent to the degree of wear of the site protector.

In this document, the curl parameter drain blocking elements is defined as E·I/(h3l). In this case, the E - modulus at elongation at 10% (M10material used for drain blocking elements, l is the width of the drain blocking ele is enta, projected on a surface parallel to the axis of rotation of the tire, and I is the moment of inertia of the cross section. The moment of inertia I of the cross section is defined as

e3l12

for cases in which the above-mentioned drain blocking element has a constant width l in the direction of its height, and drain blocking element has a constant thickness e.

In addition, h is the height of drain blocking element in the direction perpendicular to the axis of rotation of the tire. Thus, the curl parameter drain blocking item: E·I/(h3l) is a complex function of the size of drain blocking element and characteristics of the material used for drain blocking element.

When designing a tread for a pneumatic tire, in which, as described above, is provided depreciation drain blocking element to the extent equivalent to the wear area of the tread, while reducing noise caused by resonance of the pillars of the air, and maintaining the characteristics of the drainage, it was found that the parameter of the curve of drain blocking element

EI h3l

is a parameter suitable for the evaluation of these effects (in particular, the characteristics of the drainage of water and wear characteristics drain blocking element), and through analysis and experiments have established that the effects described above could be obtained in an effective manner, if the parameter was within the range mentioned above (was equal to at least 250 PA and equal to at most 350 PA).

In this document, the term "groove" refers to space that has a certain width and a certain depth and a limited two walls, which under normal conditions of use does not come into contact with each other.

In addition, the term "circumferential groove" refers to a groove, which runs in the circumferential direction of the tire, and covers not only the rectilinear grooves, but the grooves that run around the entire tire in the circumferential direction of the zigzag or wavy.

In addition, a "fingerprint protector" refers to the surface area of the tread that is in contact with the road surface when the tire is mounted on a suitable rim, as defined in industry standards, listed below, and inflated to its design pressure, and prilojeniya load.

In addition, the "standards" are defined industrial standards that apply in the area in which the tire is manufactured or used. Examples of industry standards are: in Europe - “Standards Manual” ETRTO (European technical organization for tire and rim); in the USA “Year Book” TRA (Association for tire and rim); and in Japan - “JATMA Year Book” (manufacturers ' Association the Japan automobile tire). In addition, the concept of "suitable rim" refers to the rim specified in the standards in accordance with the size of the tires, "design pressure" refers to the air pressure established in these standards in accordance with the carrying capacity, and the "design load" refers to the maximum weight that is allowed to load the bus in accordance with these standards.

In addition, the modulus of elasticity of the material" in the present invention refers to the tensile stress (modulus) when the elongation at 10% (M10), obtained by tensile testing of vulcanized rubber mixture at a temperature of 23°C., measured in accordance with JISK6251 (JIS - Japanese industrial standard), and in the present invention the tensile stress at elongation of 10% in the test based on the Japanese industrial standard is used as the value of “E”above. For Paul the treatment of samples for testing unvulcanized rubber mixture is subjected to vulcanization for 40 minutes at a temperature of 150°C and subjected to cutting by using a specified hoteleorotava or annular blanking punch. Samples for testing can be collected from the vulcanized tire. In this case, the resulting rubber mixture is cut into thin portion having a thickness, comprising from 0.4 mm to 10 mm, and subjected to cutting by use of annular blanking plug with an outer diameter in the range from 3 mm to 10 mm elongation test specimens was measured after reduction of stresses in the samples for tests and calculated by dividing the tensile force elongation at 10% of the original cross-sectional area of the sample for testing. Measurements are performed in accordance with JISK6250 and in standard conditions of temperature (23±2°C) and humidity (relative humidity of 50±5%).

In the present invention, the elastic modulus at elongation at 10% (M10material used for drain blocking elements, is preferably from 2.0 MPa to 8.0 MPa. In accordance with the present invention configured thus can be guaranteed water drainage and may be provided with wear drain blocking elements to approximately the same extent as the area of the tread, while reducing noise caused by resonance of the pillars of the air. In other words, if the elastic modulus at elongation at 10% (M10) Matera is Ala, used for drain blocking elements is less than 2.0 MPa, there is an increased risk that drain blocking elements will be bent by contact with the road surface due to the reduced rigidity of the material, and thus, it will be difficult to provide wear drain blocking elements to approximately the same extent as the part of the tread. On the other hand, if the elastic modulus at elongation at 10% (M10material used for drain blocking elements will be greater than 8.0 MPa, due to the higher rigidity of the material will be difficult to ensure flexion drain blocking elements under the action of the pressure of the water that got into the ring groove. Therefore, if the elastic modulus at elongation at 10% (M10material used for drain blocking elements will be defined in the range from 2.0 MPa to 8.0 MPa, it may be provided with drainage and may be provided with wear drain blocking elements to the extent equivalent to the wear area of the tread, while reducing noise caused by resonance of the pillars of the air.

In the present invention the thickness of the drain blocking elements is preferably from 0.5 mm to 0.7 mm In accordance the present invention, configured in this way can be provided with water drainage and may be provided with wear drain blocking elements to the extent equivalent to the wear area of the tread, while reducing noise caused by resonance of the pillars of the air. In other words, if the thickness of the drain blocking elements is less than 0.5 mm, there is an increased risk that drain blocking elements will be bent by contact with the road surface due to the reduced stiffness drain blocking elements, due to their size, and thus, it will be difficult to provide wear drain blocking elements to approximately the same extent as the part of the tread. On the other hand, if the thickness of the drain blocking elements is more than 0.7 mm, due to the higher rigidity of the drain blocking elements, due to their size, would be difficult to ensure flexion drain blocking elements under the action of the pressure of the water that got into the ring groove. Therefore, if the thickness of the drain blocking elements will be defined in the range from 0.5 mm to 0.7 mm, can be provided with water drainage and may be provided with wear drain blocking elements to the extent equivalent the th degree of the wear area of the tread, while reducing noise caused by resonance of the pillars of the air.

In the present invention the material used for drain blocking elements, preferably represents the same material as the material of the tread comprising at least two ribs. In accordance with the present invention configured thus can be provided with water drainage and may be provided with wear drain blocking elements to the extent equivalent to the wear area of the tread, while reducing noise caused by resonance of the pillars of the air, without using a special process during manufacture, because of the special material is not used for the part representing the drain through the element.

In the present invention the material used for drain blocking elements, preferably is a material different from the material of the tread comprising at least two ribs. In accordance with the present invention configured thus can be provided with water drainage and can also be provided with a wear drain blocking elements to the extent equivalent to the wear area of the tread, while ensuring that SN is making noise caused by resonance of the pillars of the air, even if a special material is used to plot the tread which is very important to ensure the operating characteristics when in contact with the ground, since there is a possibility to use for parts, representing a drain blocking element, a suitable material, adapted to its size.

In the present invention, the cross-sectional shape drain blocking element preferably is rectangular.

In accordance with the present invention configured thus can be provided with the actual effectiveness of bending drain blocking elements, because the shape of the cross section of drain blocking element is rectangular, and as a result, the water drainage can be provided more reliably and can be provided with wear drain blocking elements to the extent equivalent to the wear area of the tread, while reducing noise caused by resonance of the pillars of the air.

Advantages of the invention

When using the tread of the pneumatic tire in accordance with the present invention may be provided with wear drain blocking elements to the extent equival nteu wear area of the tread, while reducing noise caused by resonance of the pillars of the air, and maintaining the characteristics of the drainage water.

Brief description of drawings

Figure 1 - schematic view, schematically illustrating a tread for a pneumatic tire in accordance with one embodiment of the present invention;

Figure 2 is an enlarged cross section of the tread for pneumatic tires, when viewed along the line II-II of figure 1.

Figure 3 is an enlarged cross section of the tread for pneumatic tires, when viewed along the line III-III from Fig 1.

4 is a schematic representation that illustrates, similar to figure 2, an enlarged cross section of the tread for pneumatic tires, when viewed along the line II-II of figure 1, this schematically illustrates the state in which the tire is driven on a wet road surface;

5 is a schematic representation that illustrates, similar to figure 3, an enlarged cross section of the tread for pneumatic tires, when viewed along the line III-III from Fig 1, this schematically illustrates the state in which the tire is driven on a wet road surface; and

6 is a schematic representation that illustrates, similar to figure 3, an enlarged cross section of the tread for pneumatic tires, when viewed along the line III-III from Fig 1, this schematically illustrates the situation of the tion, in which section of the projector was worn by approximately 30%.

Embodiments of the inventions

The preferred implementation of the present invention will be described hereinafter with reference to the schematic image.

First, the tread for a pneumatic tire in accordance with one embodiment of the present invention will be described based on Fig 1 - Fig 3.

Figure 1 is a schematic view schematically illustrating a tread for a pneumatic tire in accordance with one embodiment of the present invention, figure 2 is an enlarged cross section of the tread for pneumatic tires, when viewed along the line II-II of figure 1, and figure 3 is an enlarged cross section of the tread for pneumatic tires, when viewed along the line III-III from Fig 1.

First, as shown in figure 1, reference character 1 denotes a tread 1 of a pneumatic tire in accordance with this embodiment, two circumferential grooves 2 having the width W and passing in the circumferential direction of the tire, indicated by the XX', formed in the tread 1, and the ribs 3, limited data circumferential grooves 2 formed in the tread 1. It should be noted that the tire size in this example is 225/55R16. In this embodiment, the width W of the district grooves 2 SOS the place of 14.5 mm

In the schematic image showing the imprint ("trace") 5 tread and the length L of the footprint of the tread when the tire is inflated to its design pressure and the applied design load. It should be noted that in accordance with the document “ETRTO Standard Manual 2010 applicable/suitable rim for a given size is 7J rim, the design pressure is 250 kPa and the computational load is 690 kg, and in this embodiment, the length L of the imprint is 143 mm

Rolling tires columns of air are formed between the road surface and each of the circumferential grooves 2, which pass through the imprint area 5 of the tread, and since the resonant frequency of the circumferential grooves 2 depends on the length of the air column created in a similar way, to change the frequency of the noise caused by the resonance poles of air, the length of the air column must be changed.

As shown in figure 1, many drain blocking elements 4 with a width of l, by which the circumferential grooves 2 can be substantially blocked, is formed in each circumferential groove 2 in order to change the length of the air column. The interval P between the drain blocking elements 4 formed in the same circumferential groove 2, when the formation is made such that it has a smaller size compared to the length L of the printout,so at least one drain blocking element will always be within the imprint of 5 in each circumferential groove 2. In this embodiment of the invention, the width l drain blocking elements 4 is 13.5 mm

In addition, as shown in figure 2 and figure 3, the lower portion 41 of the drain blocking element 4 is connected, as shown in the schematic, with the bottom part 21 of the circumferential grooves 2, and, as shown in figure 3, drain blocking element 4 is designed in such a way that it passes in the radial direction of the tire (the direction perpendicular to the axis of rotation of the tire). In addition, as shown in figure 2, the side surface portion 42 on each side of the drain blocking element 4 is designed in such a way that there is a predetermined gap between the item as a whole except for the connecting portion (41)described above, and the opposite walls 22 of the circumferential grooves 2.

As shown in figure 1, each drain blocking element 4 is formed so that it passes in the direction perpendicular to the direction in which are circumferential grooves 2. Each drain blocking element 4 has a rectangular cross-sectional shape, and a rectangular cross-section has a width l, as described above, and the thickness e (see figure 3).

In addition, the AK is shown in figure 2, drain blocking element 4, when viewed in the longitudinal direction (front view) of a circumferential groove 2, is formed with a rectangular shape and, as shown in figure 2 and figure 3, it has a height h, which is slightly less than the depth D of the circumferential groove 2.

Drain blocking element 4 is formed so that it traverses at least 70% of the cross sectional area of the circumferential grooves 2, and is formed so that it is deformed under the action of hydraulic pressure fluid, such as, mainly, the water that flows in the ring groove 2. In this embodiment, the depth D of the circumferential groove 2 is 8.0 mm, the height h drain blocking element 4 is 7.0 mm, the thickness e drain blocking element 4 is 0.6 mm, and drain blocking element 4 covers approximately 87% of the cross sectional area of the circumferential groove 2.

It should be noted that, for example, in the case of tires for this variant implementation drain blocking element 4 must have a rectangular shape with a height h, component, at least approximately 5.6 mm, so that it overlaps at least 70% of the cross sectional area of the circumferential grooves 2. It should be noted that the invention is not limited to this embodiment, and in that case, if the width W and depth D okrugin the second groove 2 tire change, the height h drain blocking element 4 must be changed accordingly, so that it overlaps at least 70% of the cross sectional area of the circumferential groove 2.

In this embodiment, drain blocking element 4 consists of the same material as the ribs 3 of the tread 1 (tread). It should be noted that drain blocking elements 4 can consist of a material different from the material of the ribs 3.

In addition, in this embodiment, drain blocking elements 4 are formed by using a material that has a modulus at elongation at 10% (M10), amounting to 5.8 MPa. Thus, in the present invention, the parameter of the curve of drain blocking element 4 that is defined (determined) by the expression

EIh3l,

is 304 PA. The value of this parameter bending component 304 PA represents a value that drain blocking element 4 will not bend when only air passes through the circumferential groove 2 when driving on normal dry road surface, causing the air column becomes shorter, and the noise caused by Rezo is the ANS columns of air, reduced. It should be noted that the same effect is achieved if the value of the bend is at least 250 PA and equal to at most 350 PA.

In this case, the E - modulus at elongation at 10% (M10material used for drain blocking element 4, l - the width of the drain blocking element 4, projected on a surface parallel to the axis of rotation of the tire, I is the moment of inertia of the cross section, defined on the basis of the above-mentioned width l drain blocking element 4 and the thickness e drain blocking element 4 as

e3l12,

and h is the height of drain blocking element 4 in the direction perpendicular to the axis of rotation of the tire.

Further, when a tread for a pneumatic tire in accordance with one embodiment of the present invention is driven on a wet road surface, will be described with reference to figure 4 and figure 5.

Figure 4 is an enlarged cross section illustrating the state in which the tread for pneumatic tires, when viewed along the line II-II of figure 1, is driven on a wet road surface, and figure 5 is an enlarged cross-section, illustri the existing condition, in which the tread for pneumatic tires, when viewed along the line III-III from Fig 1, is driven on a wet road surface.

As shown in figure 4 and figure 5, drain blocking element 4 having the curl parameter set equal to 304 PA, as described above, deformed or bent under the action of hydraulic pressure created by a fluid, such as, mainly, the water passing through the circumferential groove 2, when driving on a wet road surface, and as a result of its height is reduced to h*, the major part of the circumferential grooves is released due to the fact that the height decreases, and guaranteed water resistance. It should be noted that the same effect is achieved if the value of the bend is at least 250 PA and equal to at most 350 PA.

Next, after the state of wear of the tread in the tread for a pneumatic tire in accordance with one embodiment of the present invention will be described with reference to Fig.6.

6 is an enlarged cross-section to the state in which the tread for pneumatic tires, when viewed along the line III-III from Fig 1, was worn by approximately 30%.

6 illustrates a state in which after driving/mileage with a given distance, the depth D of the circumferential groove 2 has been reduced due to wear D', which is less than the initial height h drain blocking element 4. After driving/mileage with a specified distance of drain blocking element 4 having the curl parameter set equal to 304 PA, as described above, was worn out so that its distal end portion which is in contact with the road surface was sloping and its height is decreased from its initial height h to h' on the high side and h on the low side, and the height h on the low side is a height approximately the same as the depth D' ring grooves 2. It should be noted that the same effect is achieved if the value of the bend is at least 250 PA and equal to at most 350 PA.

Drain blocking element 4, the parameter of the curve which is described above, was set properly (despite the fact that he is 304 PA in this embodiment, the value of the bending can be equal to at least 250 PA and equal to at most 350 PA), is not deformed by air pressure when rolling while driving on a dry road surface, and it also will not bend. In addition, despite the fact that it is slightly drops or bends under the action of the reaction forces at the entrance of his contact with the road surface, the proper contact pressure is created between the distal end part of Kahn is full-time blocking element 4 and the surface of the road, and he wears out due to sliding within the area of the footprint of the tread in the rolling tires. The result may be provided with wear drain blocking element 4 to the extent equivalent to the wear area of the tread.

It should be noted that changes of this version of the implementation provided that will provide the effect described above, the shape of drain blocking element 4 in the direction of width l (the cross-sectional shape) can be made in the form of a wavy shape so that the element will deform under the action of hydraulic pressure, as described above, so that the contact pressure will be created relative to the road surface; or a surface drain blocking element 4, when viewed in the longitudinal direction (front view) circumferential grooves 2 may be performed, for example, in some degree with a rough part, which provides regulation of the extent to which drain blocking element 4 can be bent; or it can be made with different shape, such as rectangular or trapezoidal shape with corners that are rounded when viewed from the front.

In such cases, if, for example, a wavy or protruding element made as described above, and is ircII section can be calculated by approximation using the constitutive equation, the above-described (e3l/12), using the average thickness e of drain blocking element 4, or may be used in the defining equation for the corresponding moment of inertia of the cross section corresponding to the cross-sectional shape in accordance with this change.

Above has been described particularly preferred implementation of the present invention, but the present invention can be modified and implemented in various embodiments without limitation of the embodiment shown in the schematic.

An example of a variant embodiment of the invention

Next, to clarify the advantages of the present invention will be given an explanation of the results of the tests carried out through the use of the conventional example in which the drain blocking elements are not met, the comparative example made with drain blocking elements, and the pneumatic tire in accordance with option 1 of the implementation of the present invention.

Samples of tires in accordance with the conventional example, comparative example, and option 1 implementation in each case was the tire size 225/55R16, wheel size was 7,0J×16, and the pressure was set to 250 kPa.

(1) wear Characteristics

Samples of unused tyres were with Antonovna when using the above mentioned rims and with the above pressure on four wheels three identical vehicles (cars FR displacement of the engine, components 2000 cm3), which were set in motion in the form of columns of the three vehicles and were approximately 7000 km at a given test site asphalt with one driver in each vehicle, and were measured depth of the remaining grooves and the height of the remaining drain blocking elements.

(2) characteristics of the diversion of water

Samples of unused tires were mounted using the above-mentioned rim and with the above pressure on four wheels vehicles (cars FR displacement of the engine, comprising 4300 cm3), which were set in motion when one driver in each vehicle, in a straight track containing the road surface with asphalt, on which was formed a pool of water with depth, which constitutes approximately 10 mm, and the speed at which the driver in the vehicle felt that the tires are in a state of aquaplaning, is dened as the index, where 100 corresponds to the conventional example. A larger index indicates a more satisfactory response.

(3) characteristics of the noise

Was provided with the rotation of the samples unused tyre by using the above-mentioned rim and the above-mentioned pressure with a speed of 60 km/h on a rotating drum with a diameter of 2.7 m, installed in the anechoic test chamber, and the noise level was measured by using a MIC near the place where the bus was part of the imprint area of the tread. The measured noise present in the form of differences of sound pressure level as compared with the conventional example, for sound pressure level in the frequency band from 0 to 2000 Hz, which was used As filter. A smaller value indicates a more satisfactory response.

Table 1
Option 1 implementationThe most common exampleComparative example
Drain blockingYesNoYes
The thickness of the drain blocking elements (mm)0,6-0,6
The initial height of the drain blocking elements (mm)7,0-7,0
Module (M10) the elasticity of the material drain blocking elements (MPa)5,85,81,3
The parameter curve of drain blocking elements (PA)304-68
The depth of the remaining circumferential grooves (mm)5,55,55,5
The height of the remaining drain blocking elements (high side) (mm)6,0-7,0
The height of the remaining drain blocking elements (low side) (mm)5,5-6,5
Characteristics of the drainage (figure)100100100
Characteristic noise (dB, measured with weighting function (A)0,0+2,00,0

As shown in table 1, it can be confirmed that Cana is full-time blocking elements in the product in accordance with this embodiment are worn to the extent equivalent to the wear area of the tread, while maintaining the characteristics and noise characteristics of the drainage water.

The reference list of items

1 - Tread pneumatic tires

2 is a Circumferential groove

21 - the lower part of the circumferential grooves 2

22 - the Opposite walls of the circumferential grooves 2

3 - Rib

4 - Drain overlap

41 - the lower part of the drain blocking element 4 (the part connected to the lower part 21 of the circumferential grooves 2)

42 is a Side surface portion on both sides of drain blocking element 4

5 - Fingerprint protector

1. A tread for a pneumatic tire having at least one circumferential groove having a bottom portion and opposing sidewalls, at least two ribs adjacent to the circumferential groove, and plenty of drain blocking elements formed in said at least one circumferential groove so that the circumferential groove is interrupted, characterized in that
mentioned drain blocking elements pass from the lower part of the circumferential grooves in the direction perpendicular to the axis of rotation of the tire, so that there are gaps in these walls, and at least 70% of the cross sectional area of the circumferential groove, which is formed by drain blocking the ways, blocked, the curl parameter drain blocking elements, which pass from the lower part of the circumferential grooves in the direction perpendicular to the axis of rotation of the tire, defined as

where E is the modulus at elongation at 10% of the material used for drain blocking elements, I is the moment of inertia of the cross section of drain blocking element, h is the height of drain blocking element and l is the width of the drain blocking element equal to at least 250 PA and equal to at most 350 PA.

2. The protector according to claim 1, characterized in that the module when the elongation at 10% (M10material used for drain blocking elements equal to at least 2.0 MPa and at most equal to 8.0 MPa.

3. The protector according to claim 1 or 2, characterized in that the thickness of the drain blocking elements equal to at least 0.5 mm and at most equal to 0.7 mm

4. The protector according to claim 1 or 2, characterized in that the material used for drain blocking elements, represents the same material as the material of the tread, including the aforementioned at least two ribs.

5. The protector according to claim 1 or 2, characterized in that the material used for drain blocking elements is a material different from the material is and part of the tread, including mentioned, at least two ribs.

6. The protector according to claim 1 or 2, characterized in that the cross-sectional shape drain blocking element is rectangular.



 

Same patents:

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

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, namely, to tread pattern. Tire features tread asymmetric patter wherein ratio of actual area of contact to total area for zone 2o of outer side is larger than that for inner side zone 2i but with minor difference characteristic of water removal for right and left wheel tires. Said tire has tread surface 2 divided by four lengthwise grooves 3 and 4 into central area 5 of contact with soil, mid areas 6,6 of contact with soil and shoulder areas 7,7 of contact with soil. Said mid area 6o and shoulder area 7o in outer side zone 2o are divided by outer mid transverse grooves 8o and outer shoulder transverse grooves 10o into blocks 9o and blocks 11o. Mid transverse grooves 8o are inclined in opposite direction to inclination of shoulder transverse grooves 10o relative to tire axial direction while transverse grooves 8o and 10o are inclined at angle θmo of 5-45° and at angle θso over 0° and not over 40°, respectively.

EFFECT: better stability in rainy and dry weather.

8 cl, 6 dwg, 1 tbl

FIELD: transport.

SUBSTANCE: tread comprises multiple raised elements 10 confined by cutouts. At least one of said raised elements 10 has dents 2 of maximum depth H not larger than tread thickness. This dent is located in major direction confined by the dent track ends on new tread and in minor direction extending in tread depth. Dent 2 has first part 21 and second part 22. Dent first part 21 extends in minor direction between contact side 15 in new state and depth H1 equal to, at least, 40% of maximum depth H while second part 22 extends the first part 21 in tread depth. Note here that said second part 22 extends to depth H2. Dent second part 22 in major direction has at least one first section 221 and one second section 222.

EFFECT: improved performances.

10 cl, 7 dwg

FIELD: transport.

SUBSTANCE: tread 2 has rounded shoulders and is divided by the main lengthwise grooves 3 and crosswise grooves 4 in blocks 5 furnished with pockets 6, each having zigzag part 8. Lengthwise grooves 3 include at least two axially outer lengthwise grooves 3o dividing the tread 2 into shoulders Ysh and crowns Ycr wherein zigzag part 8 of pockets 6sh in shoulders Ysh features larger zigzag amplitude Wsh and larger zigzag pitch Psh that zigzag amplitude Wcr and zigzag pitch Wcr of zigzag part 8 of pockets 6cr in crowns Ycr. Inclination angle θsh of pockets 6sh relative to axial direction is smaller than angle θcr.

EFFECT: improved flotation at dry road at minimum deterioration of performances on snow-covered road.

7 cl, 7 dwg, 1 tbl

Air tire (versions) // 2506171

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, namely, to tread pattern of stud-free tire. One block of air tire has first and second slitted drain grooves. Every said groove extends in tire width direction. Said grooves are regularly spaced apart in tire circumference. First and second said grooves has first parts of slitted rain groove that features linear shape if seen in the plane. The slitted drain groove second part that features zigzag shape if seen in the plane and is connected with slitted drain groove first part. First part of slitted drain groove has two surfaces of slitted and opposed drain groove walls if seen in direction perpendicular to the length of said slitted drain groove. Said first part comprises the ledge arranged on first surface of said walls and recess arranged second surface of said walls to make recess connected with ledge.

EFFECT: better running on ice and snow.

20 cl, 20 dwg, 1 tbl

Pneumatic tire // 2506170

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, namely, to tread pattern of stud-free tire. Proposed tire comprises sets of blocks G composed of polygonal blocks 10 arranged tightly in crown zone 1. Polygonal blocks 10 are confined by grooves 9 including first grooves 9a of W9a width and arranged between polygonal blocks 10 adjoining in tore circular direction. Width W9a of first grooves 9a is larger than width W9b of second grooves 9b located between polygonal blocks 10, adjoining and staggered.

EFFECT: better flotation on ice and snow.

7 cl, 7 dwg, 4 tbl

Pneumatic tire // 2504483

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, namely, to tread pattern. Proposed tread pattern comprises multiple screw transverse grooves with their open ends communicated with one of two circular grooves and their extremities terminate in tread section confined on sides by circular grooves. Every skew transverse groove extends from its open end in first direction in tire circumferential line. Tread patter includes also narrow grooves with their starting parts located in the midst of appropriate skew transverse grooves. Every narrow groove extends in second direction opposite the first one to terminate at tread section. Curved and straight parts are located between open end and extremity nearby each skew transverse groove. Said extremity relates to groove straight part extending in tire circumferential direction. Closed end of narrow groove is shifted in second direction in circumferential direction relative to extremity of skew transverse groove extending there along in second direction.

EFFECT: optimised tire performances at wet road coat, higher wear resistance.

18 cl, 10 tbl, 7 dwg

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, namely, to large truck tire tread. Tire has tread 1 with absolutely new running surface 10 with at least one running path 2 confined by sidewalls located opposite each other. This running part 2 opens discretely to running surface 10 by multiple parts 21 opened outward of the tread. Note here that said open parts 21 have two ends 212 extending under running surface by channels 22 having inlets 221, 222 connected with ends 212 of said open parts 21. Said inlets 221, 222 feature mean area S. Tread is made so that every part 21 opened to sunning surface has closer 4 at every its end to close cross-section of channel inlets 221, 222 in motion and keep passage open.

EFFECT: better braking performances.

10 cl, 10 dwg

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, particularly, to passenger car tire tread patters. Tire tread has grooves 2 directed in circle to confine sets of raised elements that make two edge rows. Edge rows have multiple transverse grooves of definite depth and confined by opposite walls. Multiple transverse grooves of one end row include at least one support block 5 extending from at least one wall to confine said groove. Every support block 5 has active surface 50 to contact with other surface in contact with soil surface. Tread features preset relationships for the sum of areas of active surfaces 50 at maximum length LM in crosswise direction of virtual convex surface surrounding all active surfaces of transverse groove. Besides, it has at least one fluid flow channel between every support block and groove bottom.

EFFECT: better operating performance on wet roads.

8 cl, 8 dwg

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, namely, to tread pattern. Tread has H-deep grooves exposed at tread surface and confined by material surfaces spaced at least 2 mm apart. Multiple grooves 2 have at least one shaped ledge 6 at, at least one of said opposed surfaces. Said shaped ledge is confined by radially outward and radially inward surfaces. Said radially outward surface is located closer to tread surface 10 than radially inward surface. Inner and outer surfaces cross at points A1, A2 of the ledge distant from each other in groove direction. Note here that every of said surfaces of every ledge, radially inner and outer, features such profile in section parallel with confining surfaces that radially outward surface profile length is larger than that of radially inward surface.

EFFECT: better performances in rainy weather.

5 cl, 6 dwg

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

Pneumatic tire // 2508995

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, namely, to tread pattern. Tire tread has circular major grooves extending in tire circumference and contact parts separated and composed on said circular major grooves. Every said central zone contact part and contact parts of right and left shoulder zone has multiple sipes. At least 90% of sipes located in inner side area represent are 2D sipes in central zone and at leas 90% of sipes in outer side surface are 3D sipes in shoulder zone. Every contact parts of right and left shoulder zones has multiple transverse side grooves arranged in definite order in tire circumference. The number N-ce of transverse side grooves in central zone contact part and the number N-sh of transverse side grooves in contact parts of right and left shoulder zones are relates as N-ce>N-sh.

EFFECT: perfected design.

20 cl, 7 dwg

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, namely, to tread pattern. Tire features tread asymmetric patter wherein ratio of actual area of contact to total area for zone 2o of outer side is larger than that for inner side zone 2i but with minor difference characteristic of water removal for right and left wheel tires. Said tire has tread surface 2 divided by four lengthwise grooves 3 and 4 into central area 5 of contact with soil, mid areas 6,6 of contact with soil and shoulder areas 7,7 of contact with soil. Said mid area 6o and shoulder area 7o in outer side zone 2o are divided by outer mid transverse grooves 8o and outer shoulder transverse grooves 10o into blocks 9o and blocks 11o. Mid transverse grooves 8o are inclined in opposite direction to inclination of shoulder transverse grooves 10o relative to tire axial direction while transverse grooves 8o and 10o are inclined at angle θmo of 5-45° and at angle θso over 0° and not over 40°, respectively.

EFFECT: better stability in rainy and dry weather.

8 cl, 6 dwg, 1 tbl

Pneumatic tire // 2504483

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, namely, to tread pattern. Proposed tread pattern comprises multiple screw transverse grooves with their open ends communicated with one of two circular grooves and their extremities terminate in tread section confined on sides by circular grooves. Every skew transverse groove extends from its open end in first direction in tire circumferential line. Tread patter includes also narrow grooves with their starting parts located in the midst of appropriate skew transverse grooves. Every narrow groove extends in second direction opposite the first one to terminate at tread section. Curved and straight parts are located between open end and extremity nearby each skew transverse groove. Said extremity relates to groove straight part extending in tire circumferential direction. Closed end of narrow groove is shifted in second direction in circumferential direction relative to extremity of skew transverse groove extending there along in second direction.

EFFECT: optimised tire performances at wet road coat, higher wear resistance.

18 cl, 10 tbl, 7 dwg

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, particularly, to tire tread with flexible device to decreased noises related with resonance of air flowing along tire grooves all over tire circumference. Tire tread 1 is made from rubber with Shore hardness of at least 65. Said tread has at least one groove of width W and depth D. Said groove 2 is confined by two opposite tread parts connected by groove bottom 21. tread comprises multiple closing membranes 4 formed in at least one groove 2. Every closing membrane 4 closed groove 2 at, at least, 50% of groove cross-section. Note here that every closing membrane 7 has mean thickness not over 2 mm and can bend at fluid passage. Closing membranes 4 are made of material with Shore hardness of not over 62. Note here that said hardness is smaller than that of the tread.

EFFECT: decreased resonance noises.

8 cl, 7 dwg

Pneumatic tire // 2489268

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, namely, to tread pattern. Tire 1A comprises, at least, four lengthwise main grooves 21-24 and multiple rib-like parts 31-35 separated by said main grooves in tread region. Besides, area of outer secondary contact with pavement 32 comprises narrow zigzag groove 321 extending in lengthwise direction to separate outer secondary contact area in transverse direction of the tire. Also, it includes multiple first slits 322 arranged with preset spacing in tire lengthwise direction to extend from outer edge contact area 32 to inner transverse area, out of zigzag narrow groove 321, to keep vent spacing gap.

EFFECT: stable steering, reduced noise.

20 cl, 8 dwg, 4 tbl

Pneumatic tire // 2489267

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, namely, to tread pattern. Propose tire comprises side strips and tread section there between. Two peripheral zigzag-like main grooves extend along tire circle in every zone from tire axial line in tread region. First transverse grooves extend from main inner peripheral groove to pattern end. Second transverse grooves extend to pattern end from outer peripheral main groove. Inner peripheral main groove wall has surface with inclination varying in circle. Outer block located between main grooves has traverse cutout-like groove extending in tire width or from inner, or from outer main groove and closed within outer block. Depth of transverse cut-out groove is smaller than that of the first and second transverse grooves.

EFFECT: higher braking properties on snowy and wet pavement.

20 cl, 7 dwg, 1 tbl

FIELD: transport.

SUBSTANCE: tire comprises tread band including first elastomer material of first rupture strength and multiple circumferential grooves formed in tread. Every said circumferential groove is composed by two lateral walls separated by bottom. At least, one of said grooves comprises protective layer from second elastomer material with second rupture strength applied on, at least, groove bottom. Second rupture strength-to-first rupture strength ratio makes, at least, 1.5.

EFFECT: higher rupture strength.

24 cl, 2 dwg, 2 tbl

Pneumatic tire // 2477226

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, namely, to winter tire tread pattern. Proposed tire has multiple rib-like areas of contact with pavement 3 separated by multiple main grooves 2 extending in tire lengthwise direction and/or block-like areas of contact with pavement 3 separated by multiple main grooves 2 and multiple grouser grooves 4 crossing main grooves 2 on tread surface 11. Surface of contact with pavement 3 has multiple ledges 6 of, at least, two types, that feature different surface areas. Further still, at least, most ledges 6 located by smaller ledge 61 of relatively small surface area are larger ledges 6 of relatively large surface area.

EFFECT: better bite on snow and ice.

12 cl, 6 dwg, 1 tbl

FIELD: tire industry.

SUBSTANCE: proposed tire is provided with tread having two deep circular grooves separating central zone from two side shoulder zones furnished with shoulder blocks. Sum of width values of shoulder zones in tread is either equal to or less than 60% of its summary width. Width of each shoulder zone is not less than 20% of summary width. Each circular groove at side separated from central zone adjoins continuous path from which cross grooves branch to limit shoulder blocks.

EFFECT: increased wear resistance of tire.

10 cl, 9 dwg

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