Pneumatic tyre for vehicle
SUBSTANCE: at maximum height of tire tread pattern, circumferential grooves (1, 2), tilted grooves (9), and transversal grooves (7, 8, 10, 14, 14a, 18) are made, which delimit checkers (4, 6, 12, 15, 17a, 17b) of tread pattern and are respectively provided with multiple slots (19, 20, 21, 22), oriented essentially in transversal direction of tread pattern. Transversal grooves (7, 8, 10, 14, 14a, 18) along their length have less depth than circumferential grooves (1, 2).
EFFECT: better dynamic properties of tire on winter roads without lowering tread rigidity and thus without deterioration of dynamic properties on dry roadway.
7 cl, 4 dwg
The invention relates to a pneumatic tire of a vehicle, in particular for use when driving conditions in the winter, equipped with a treadmill with a tread pattern for maximum tread depth circumferential grooves of the tread pattern of the inclined grooves and the like, as well as with transverse grooves which separate pieces of the tread, each of which is equipped with a number of slits that are oriented transversely or essentially in the transverse direction of the tread pattern.
Such a pneumatic tyre of a vehicle is known, in particular from the description to the document EP-B-0671288. This bus is used treadmill asymmetric tread pattern, which in relation to the vehicle has an internal area of the treadmill and the outer area of the treadmill. The boundary between the elements of the drawings of the tread in the inner area of the treadmill and the outer area of the treadmill relative to the equator of the tire in the assembled condition, the bus is shifted to the outer side, which is directed away from the vehicle. Moreover, the elements of the tread pattern in the inner area of the treadmill and the outer area of the treadmill made accordingly repeated around the circumference of the identical parts of the picture protect the RA, accordingly, diametrically steps, and the total number of steps in the outer area of the treadmill is less than the internal area of the treadmill, with the roll surface in the half of the tread is at least essentially the same. Due to such events is created particularly suitable for use when driving conditions in the winter tyre in which you can take advantage of asymmetric of the tread with different total number of steps in the inner area of the treadmill and in the outer area of the treadmill and simultaneously through the same large proportion of the running surface in the half of the tread should be provided with balanced rigidity of the entire tread, which favorably affects the dynamic characteristics of the bus.
Improvement of the dynamic properties of tyres when driving conditions in the winter time, such as on snow or ice, you can provide a constructive manner by increasing the number of available edges grip the tire with the road and therefore by increasing the number of slots in a checker pattern. However, as a result of increasing the number of slots is reduced stiffness checkers tread, and this adversely affects DIN the chemical properties of tires while driving on dry roadway and stimulates increased wear. For this reason, as a rule, it is impossible to increase the density of the grooves to such an extent that would be desirable.
Therefore, the basis of the invention is to enable the increase in the tire of the specified type density of the slots to a greater extent than it is in practice to improve the dynamic properties of tyres on winter roads without reducing the rigidity of the tread and, thus, without having to put up with dynamic properties on a dry roadway.
The task according to the present invention is solved in that the transverse grooves along its length have a lower depth than the circumferential grooves.
For this reason, in the pneumatic tire made in accordance with the present invention, the transverse grooves in contrast to the accepted practices are not performed with the same or almost the same tread depth as circumferential grooves, and are "raised". This event increases the rigidity of the tread, so that the density of the grooves in the blocks of the tread can be increased accordingly.
When this was revealed advantage in the case of the transverse grooves have a depth which is 30-75% of the tread depth. Thus, depending on the chosen density is asemenea slots in the blocks of the tread is possible to increase the rigidity of the tread and, accordingly, to agree an appropriate way and at the same time to maintain high levels of diversion of water from the tread.
For the ability to divert water and, consequently, to characterize aquaplaning tyre has a positive value if the transverse grooves in the area of the treadmill from the shoulder area will have a greater depth in comparison with the transverse grooves in the middle pane of the treadmill.
The optimal ratio can be provided in the case, if the depth of the transverse grooves in the area of the treadmill from the shoulder area of the tread of the tire will be in the range of 30-60% of the tread depth and the depth of the transverse grooves in the middle pane of the treadmill will be in the range 60-75% tread depth.
In addition, achieved another advantage if in the bottom center of each transverse groove is made in the radial direction of the slot, which runs the entire length of the transverse grooves. These slits in the bottom of each of the transverse grooves have the effect, according to which they can counteract the possible reduction of the footprint length (contact surface of the wheels) - an effect that could occur as a result of insufficient depth of the transverse grooves.
In treadmills, tread, is accomplished according to the present invention, can be provided tread blocks, in which the slits are parallel to the bounding these checkers transverse grooves. In this design, it would be advisable, if the distance between the bounding transverse groove edges checkers and passing near these edges of the slits is smaller than the mutual distance between all held in the blocks of the tread grooves. Due to such execution stiffness checkers tread becomes aligned as "elevated" transverse grooves otherwise would increase the rigidity of the boundary areas checkers tread located near the transverse grooves. Aligned thus the rigidity of checkers tread causes the rolling tires of the same size and tension, respectively, "rollover" of certain parts of the checkers in the footprint of the tire and, thus, uniform pressure distribution.
Other characteristics, advantages and details of the invention will be described in more detail with reference to the drawings, which schematically shows an example embodiment of the invention.
The drawings show:
Figure 1 is a top view of area sweep of the tread according to a variant embodiment of the invention.
Figure 2 is a section along the line b-b In figure 1.
Figure 3 is a sectional view on the line is C-C in figure 1.
4 is a detail of figure 1 on an enlarged scale.
In figure 1 the line a-a indicated the equator of the tire, and the position In the width in contact with the ground part of the tread.
Shown in figure 1 treadmill tread of a car with a winter tread pattern represents asymmetrically performed treadmill tread, which has a certain outer section O and a defined internal site I, so the bus with such a treadmill tread should be mounted on the vehicle so that the inner area I was rotated to the longitudinal axis of the vehicle. However, the invention is in no case prevented asymmetric and/or tied to the direction of movement treadmills protector, and a Jogging trail tread can be performed in any manner. Shown in the example treadmill tread has a tread elements in the form of checkers tread, which is formed by passing and location of the grooves and grooves, as will be discussed in more detail below.
Treadmill tread according to figure 1 provided passing through the circle, essentially right circular groove 1, which in relation to the equator And the bus moved towards the outer shoulder of the tire, while the offset is 5-20% of the width b is the creation of the tread. Circumferential groove 1 forms the border between the outer section O and the inner section I. In the outer section O for the ring groove 1 adjoins passing around the circumference of a series of 3 pieces, which is separated another zigzag circumferential groove 2 from row 5 of the shoulder pieces. Rows 3 and 5 sticks consist of checkers 4, respectively, 6 in which each row 3, 5 checkers are separated from each other in the circumferential direction by using a direct lateral grooves 7, 8. Here we should point out that under transverse grooves shall be interpreted to mean such grooves, which accurately with the transverse direction of the tread form an angle, which is ≤45°. The transverse grooves 7 are inclined to the transverse grooves 8 in the opposite direction and is formed with a transverse direction of the angle α, which in the example shown, the performance is approximately 10°. The transverse grooves 7, 8 come into the field angles of the zigzag in the circumferential groove 2 and offset from each other in the direction of the circumference.
In the inner section I of the tread are inclined grooves 9 at an angle β of approximately 30° relative to the direction of the circumference and each end near the equator of the tire And in the transverse groove 10, which separates from each other two tread blocks 12 average number of 11 pieces in the circumferential direction. Inclined to the skill sets 9 come in every second transverse groove 10, these transverse grooves 10 through the descending inclined groove 9 reach the next inclined grooves 9 and, thus, together with the transverse grooves 10 and the circumferential groove 1, define the configuration of the sticks 12 tread. Their second ends of the inclined grooves 9 come close to the inner shoulder in the transverse grooves 14, which are held between the blocks of the tread 15 shoulder some of the sticks 16. Inclined grooves 9 and here come only every second transverse groove 14, while these transverse grooves 14 are held for incoming transverse groove 9 and go up to the next transverse grooves 9 in the form of transverse grooves 14a. Tread blocks 15 in the shoulder range of draughts 16 as a result of this execution are of different sizes. As a result, between the transverse grooves 9 are still areas of the tread, which are divided respectively into two tread blocks 17a, 17b, which are separated from each other by respective transverse grooves 18. All transverse grooves 10, 14, 14a and 18 in the inner plot I have in the shown embodiment, the direct passage and in the transverse direction of the treadmill is inclined in an identical manner so that they are transverse to the direction form an angle γ of magnitude of about 10°.
Circumferential grooves 1, 2, and inclined grooves 9 have a depth T (2, 3), which corre is there provided (maximum) depth picture of the tread.
Pieces 4 and 6 of the tread in the outer area On the treadmill tread respectively provided with many intersecting slits 19, 20, while the setting in the shoulder pieces 6 slots 19 are oriented in the transverse direction of tracks of the tread and at least in its middle part on the top view is made wavy. Provided in rows 3 checkers 4 of the protector of the slot 20 is made in a similar way, but parallel transverse grooves 7. Also checkers 12, 15, 17a, 17b tread in the inner section I of the tread respectively provided with multiple slits 21, 22, which cross pieces 12, 15, 17a, 17b, protector and, at least in its middle part is made wavy, with the wave form has a smaller amplitude and shorter wavelength compared with the waveform of the slots 19 and 20. The slots 22 in the blocks 15 of the tread shoulder number 16 are held in the transverse direction of the tread, the slits 21 in the following checkers 12, 17a and 17b of the tread, respectively, in parallel transverse grooves 10, 14a and 18, which restrict these checkers 12, 17a, 17b tread.
In the shown embodiment, each piece 4, 6, 12, 15, 17a, 17b of the tread has at least three parallel relative to each other by the slits 19, 20, 21, 22, which have a width of from about 0.4 to 0.6 mm and, at least in some areas reach the maximum tread depth So Shown treadmill tread is density of the slits, which compared to the rest of the densities of the placement of the slits, resulting in significant measure, you can improve the dynamic properties on winter roads, in particular the characteristic of the clutch tires with ice or snow road. However, due to the large density of the slits treadmill tread becomes "unstable", that is, the rigidity of the treadmill is significantly reduced. The invention counteracts this potential reduction in the rigidity of the tread, due to the fact that, as shown in figure 1 and in sections 2 and 3 transverse grooves 7, 8, 10, 14, 14a and 18 are made in a special way.
Figure 3 shows a section along the line C-C in figure 1 and in accordance with, and the cross-section of the grooves 8 in the shoulder series of 5 pieces, and the cross-section of the grooves 14 in shoulder range of 16 pieces. Thus, the transverse grooves 8 and 14 do not reach the maximum depth T of the tread pattern, but only to the depth of T1that is 60-75% of the depth T of the tread. In the shown example embodiment of the invention the transverse grooves 8, 14 limited lateral surfaces of the grooves 23, which are at an angle approximately in the radial direction, respectively, deviate in minor is entrusted least from the radial direction by approximately 5°. Through the curvature of each side surface 23 of the groove enters the bottom of the groove. However, the transverse grooves 8 and 14 on the bottom of the grooves are not continuous, and provided with a slot 24, which emanates from the center of the bottom of the groove along the entire length of the transverse grooves 8 and 14 in the radial direction reaches the depth T of the tread. The slot 24 has a width that is within 0.5 to 1 mm.
Figure 2 shows a section along the line b-b In figure 1 and, respectively, the cross section of the transverse grooves 7, 10, 14a and 18, which are held in the middle part of the tread. As can be seen from figure 2, the transverse grooves 7, 10, 14a and 18 reach the depth of T2that is 30-60% of the tread depth So the Transverse grooves 7, 10, 14a and 18 is limited by lateral surfaces 25a, 25b of the grooves, the side surface 25a of the grooves extend from the surface of the tread, are essentially in the radial direction and moving at an obtuse angle to the second side surface 25b of the groove, which faces toward the center of the bottom of the groove. Also the transverse grooves 7, 10, 14 and 18 are not connected on the bottom of the groove, and here from the center of the bottom of the groove passes in the radial direction, a narrow slot 26 to the depth T of the tread. Also the slots 26 have a width that ranges from 0.5 to 1 mm and pass through the entire length of the transverse Kahn the wok 7, 10, 14a and 18.
Therefore, in the shown preferred embodiment of the invention the transverse grooves 8 and 14 in the side regions of the tread is reduced in its depth to a lesser extent in comparison with the transverse grooves 7, 10, 14a and 18 in the Central region of the tread. For this reason, the depth of the transverse grooves 7, 8, 10, 14, 14a and 18 in the tread, depending on their position in the tread is reduced to varying degrees. This event is to reduce the depth of the transverse grooves 7, 8, 10, 14, 14a and 18 compared with a maximum depth of tread increases the rigidity of the tread and therefore compensate for the potential decrease in the rigidity of the tread due to the increased density of the slits. The slots 24, 26, which are provided in the bottom of each of the transverse grooves 7, 8, 10, 14, 14a and 18 have effect, namely, that they counteract the possible reduction of the footprint length effect, which could occur as a result of insufficient depth of the transverse grooves.
Figure 4 shows a top view of one of the pieces 17b protector together with the two adjacent transverse grooves 18 and 14a in an enlarged scale. Piece 17b of the tread has plenty of passing parallel to each other and transverse grooves 18 and 14a of the PoWPA is it 21. The density of the slits is large, as shown checker 17b tread crossed six slots 21. Passing near the transverse grooves 18 and 14a of the slot 21 are of such length a1from the edge of checkers, limiting the transverse grooves 18 and 14a, which is less in comparison with mutual distance and2held within these outer slits 21 additional slots 21. For this reason, inside checkers 17b tread notches 21 separate pieces 17b tread elements checkers 27b that area compared to the adjacent transverse grooves 18 and 14a elements 27A checkers. This event has a predominant effect is that the wall stiffness checkers 17b tread averaged, because the slots 21 have more depth in comparison with the transverse grooves 14a and 18. Identical in size to the elements 27A checkers and elements 27b checkers would lead to uneven circumferential stiffening elements 27b checkers. The event, which is explained here using checkers 17b tread, preferably is carried out at all those checkers tread, the slits which are parallel to the edge pieces of the tread, which is limited by transverse grooves. Averaged in this way the stiffness of the circle checkers risunki the tread lead rolling tires to equal tensile strength, accordingly, the "overturning" of certain elements 27A, 27b checkers in the length of the tire imprint and consequently a uniform pressure distribution. In the result, the base surface of the individual elements checkers remains as large as possible and, thus, supports the optimal power transmission tires on smooth surfaces. Mentioned isometric stretching and "rollover" of certain elements checkers leads, in addition to isometric deformations slippage and movement of the shift of individual elements checkers in the length of the tire imprint and, thereby, to uniform and less wear.
Shown in the drawing event, which is to the transverse grooves in the side regions of the tread were elevated to a lesser extent compared to the average area of the tread, represents the preferred event, depending on the type of tread treadmill tread according to the invention can be also executed in such a way that the transverse grooves in the Central region of the tread had more depth than those that are located in marginal areas or in the shoulder area, or to the depth of the transverse grooves match. In accordance with the present invented the Yu tire transverse grooves, tread blocks in any case limited to the high density of the slits and made with less depth compared with a maximum depth of tread. These transverse grooves are performed with depth, which corresponds to 30-75% of the maximum tread depth. Tire with tread depth of 8 mm depth of the transverse grooves in the ranks of the shoulder checkers is, for example, 6.5 mm, and the depth of the transverse grooves in the Central region of the tread 3 mm.
The invention is not limited to the depicted and described variants of implementation. Thus, in particular, it is possible to treadmills to combine pieces of the tread or series of checkers tread passing in the circumferential direction of the tape of the tread.
The list of items
Ah - the equator of the tire,
In - width,
I - inside,
O - outside,
1 - ring groove,
2 is a circumferential groove,
3 - the number of checkers tread,
4 - checkers tread,
5 - shoulder number of pieces of the tread,
6 - checkers tread,
7 is a transverse groove,
8 is a transverse groove,
9 is inclined grooves
10 is a transverse groove,
11 - the average number of pieces of the tread,
12 - checkers tread,
14 is a transverse groove,
14a is a transverse groove,
15 - pieces of a picture prot is Chora,
16 - brachial number of pieces of the tread,
17A - checkers tread,
17b - checkers tread,
α - angle,
β - angle,
18 is a transverse groove,
19 - slot,
20 - slot,
21 - slot,
the 22 - slot,
23 - side surface of the groove,
24 - slot,
25A - side surface of the groove,
25b - side surface of the groove,
the 26 - slot,
27A - element checkers
27b is an element checkers
T - tread depth,
1. A pneumatic tyre of a vehicle, in particular for use when driving conditions in the winter, equipped with a treadmill tread with a tread pattern, performed at the maximum depth of the tread circumferential grooves (1, 2), the inclined grooves (9) and similar items, as well as the transverse grooves (7, 8, 10, 14, 14a, 18)separated pieces (4, 6, 12, 15, 17a, 17b) of the tread, each of which is equipped with a number of slots(19, 20, 21, 22), which is oriented essentially in the transverse direction of the tread, and the transverse grooves (7, 8, 10, 14, 14a, 18) along its length have a lower depth than the circumferential grooves (1, 2), characterized in that in the bottom center of each of the transverse grooves (7, 8, 10, 14, 14a, 18) in the radial direction is made a slot (24, 26), which passes through in the her length corresponding transverse grooves (7, 8, 10, 14, 14a, 18).
2. A pneumatic tyre of a vehicle according to claim 1, characterized in that the transverse grooves (7, 8, 10, 14, 14a, 18) have a depth (T1, T2), which is 30%-75% of the depth (T) of the tread pattern.
3. A pneumatic tyre of a vehicle according to claim 1, characterized in that the transverse grooves (8, 14) in the area of the tread side of the shoulder have more depth (T1compared with transverse grooves (7, 8, 10, 18) in the Central region of the tread.
4. A pneumatic tyre of a vehicle according to claim 1, characterized in that the depth (T1) cross grooves (8, 14) in the area of the tread side of the shoulder is 60%-75% of the depth (T) of the tread pattern.
5. A pneumatic tyre of a vehicle according to claim 1, characterized in that the depth (T2) cross grooves (7, 10, 14, 18) in the Central region of the tread is 30%-60% of the depth (T) of the tread pattern.
6. A pneumatic tyre of a vehicle according to claim 1, characterized in that the width of the slots (24, 26) is 0.5-1 mm.
7. Pneumatic tire with means (4, 12, 17a, 17b) of the tread, which are at least three slots (20, 21) parallel to the transverse grooves (7, 10, 14, 18), which restrict these pieces (4, 12, 17a, 17b) of the tread, characterized in that it is Olney according to one of claims 1 to 6, the distance (a1between the edges of the sticks tread, which limit the transverse grooves (7, 10, 14, 18), and located near the edges of the slots (20, 21), is less than the mutual distance (a2between all the other passing in checkers tread (4, 12, 17a, 17b) slots (20, 21).
SUBSTANCE: invention relates to automotive industry, namely, to tread pattern. Proposed tire features tread patter asymmetric about both sides of tire equator. At least, four main grooves extending in along tire circumference make multiple sections. Multiple first inclined grooves arranged at angle to direction in tire circumference are formed on central section located on tire equator. Multiple second inclined grooves are arranged at angle in the same direction are formed at inner intermediate section located on vehicle inner side relative to central section. Every first inclined groove is open at its one end into main groove located between central section and intermediate second of inner side to terminate at opposite side, on central section. Every second inclined groove is open at its one end into main groove located between central section and intermediate second of inner side to terminate at opposite side, at inner side intermediate section.
EFFECT: improved drainage characteristic and wear resistance.
12 cl, 8 dwg, 3 tbl
SUBSTANCE: contact areas constituting tread surface contacting with road surface form circular groove 32 which passes in circumferential direction of tire. In the circular groove 32, flat area 60 and contact area 70 is formed. Flat area 60 of groove represents flat surface of bottom 32a of circular groove 32. Inner contact area 70 protrudes towards tread surface from the bottom 32a of circular groove 32. In the inner contact area 70 group of narrow grooves 80 is formed transversing the tread. Circular groove 32 width in transversal direction of tread is 5-30% of tread surface width in transversal direction of tread.
EFFECT: better traction and breaking properties of tire, as well as better drainage characteristics and preventing slippage on ice- and snow-covered roads.
13 cl, 11 dwg
SUBSTANCE: invention relates to automotive industry. Tread surface 2 has outer zone 2o directed the vehicle outward and including one main lengthwise groove 3 arranged there inside. Internal zone 2i directed the vehicle inward comprises first and second lengthwise grooves 4, 5 arranged there inside. Central area Rc between main lengthwise grooves 3 and 4 are made up of rib 10 extending in lengthwise direction. Outer shoulder zone Ro between main lengthwise groove 3 and edge TEo of contact with soil is made up of set of external blocks 12 separated by main inclined grooves 6. External blocks 12 comprises additional inclined grooves with inclination other than that of inclined grooves 6 to make external blocks 12 divided into first part on tire equator side and second part on the side of contact with soil.
EFFECT: higher wear resistance and better road holding, higher performances on wet road surface.
7 cl, 13 dwg
SUBSTANCE: invention relates to automotive industry. Pneumatic tire comprises inner and outer (relative to vehicle) crown grooves (3i, 3o) arranged on both sides of tire centerline to extend along tire lengthwise direction. Central zone 5 of contact with soil is formed between aforesaid grooves while bent inclined grooves 8 are arranged at central zone 5 of contact with soil. Each said bent inclined groove 8 runs from outer end extending into crown outer lengthwise groove 3o to extend beyond tire centerline and is inclined toward inner side relative to vehicle to vary direction toward inner side relative to vehicle and toward inner end at aforesaid central zone 5. Said bent inclined grooves 8 are interconnected by connection grooves 11 extending in tire lengthwise direction on inner ends. Central contact zone 5 includes central rib 5a surrounded by connection grooves 11 and sections of inclined grooves 8 extending between connection grooves 11, and by crown lengthwise groove 3i. Central rib 5a extends continuously in tire lengthwise direction at recurring increase and decrease in tire width in direction toward tire axis.
EFFECT: better control and water venting.
6 cl, 9 dwg
SUBSTANCE: invention relates to automotive tire to be used on ice- or snow-covered roads. Proposed tire comprises tread 2 including ring shoulder grooves 6c running nearby edges E of contact with soil, and transverse shoulder grooves 7d arranged between said groove 6c and said edge E. Said tire shoulder features such shape that protector outer surface 2a and tire side surface 14 located radially inward and axially outward from aforesaid edge E intersect to form an edge or and angle wherein each shoulder block B4 is furnished with lengthwise lamella 11 in zone running axially inward from said edge E for 2 mm or more, and for 10 mm or less. Tire side surface 14 is furnished with recess 15 located in lengthwise direction in at least a part of raised region produced by the ledge of lengthwise lamella 11 on said surface 14, while radially recessed edge of recess 15 is located in radial position corresponding to zone making 505 to 100% of the depth of lengthwise lamella 11.
EFFECT: preventing wobble, reduced wear.
5 cl, 7 dwg
SUBSTANCE: invention relates to automotive industry. Air tire 1 has tread 2 with four main lengthwise grooves 3 with width HG making, at least, 4 mm to divide said tread into central zone 4 with contact with soil, two medium zones 4m of contact with soil and two shoulder zones 4s of contact of soil. Each of zones 4 c, 4m and 4s consists of rows Bc, Bm and Bs of units divided by crosswise grooves 5. Every said unit 6 comprises plates 7. Axial width Wc of central zone 4 of contact with soil varies from 10 to 15% of width TW of tread contact with soil; axial width Wm of central zone 4m of contact with soil varies from 15 to 22% of width of tread contact with soil and axial width Ws of shoulder zone 4s of contact with soil varies from 15 to 22% of width TW of tread contact with soil. Central zone 4m of contact with soil is divided into axially inner parts 4mi and axially outer part 4mo by the grooved in tire lengthwise direction, groove width Hg varying from 2 to 6 mm.
EFFECT: improved contact of tire with icy and snowy road.
6 cl, 5 dwg, 1 tbl
SUBSTANCE: invention relates to automotive industry. Pneumatic tire half-section obtained by dividing tire tread by treat pattern central line into halves comprises: central main groove 3, lateral main groove, abrupt grooves 7 and central contact section 6 divided into multiple blocks 14 that form a line of blocks 15. Abrupt groove 7 has sloped groove bottom section 8 wherein groove depth increase gradually from central main groove 3 toward first lateral main groove 5. First acute-angles section arranged between central main groove 3 and each abrupt groove 7 has first chamfered section 9, wherein contact section height decreases gradually toward edge 9 from its crest. It has also sloped section 8 of groove bottom and first sloped section 9 located adjoining each other in direction W of tire width.
EFFECT: reduced noise and wear, improved draining properties and higher stability.
11 cl, 7 dwg
SUBSTANCE: proposed invention relates to automotive industry. Central groove (14) directed along circumference is arranged on equator (CL) of tread (12). Note here that first transverse grooves (20) are arranged on both sides of aforesaid central groove that are formed with smaller angle with respect to tire axial direction compared with first transverse groove (20).One end of every first transverse groove (20) and one end of every second transverse groove (22) are connected with shoulder zone groove (18) directed along circumference, while shoulder zone transverse grooves (23) are arranged on outer side of every shoulder zone groove (18) directed along circumference. Every shoulder zone transverse groove (23) runs from jointing part towards tread edge (12E) and is formed at smaller angle to tire axial direction than that of first transverse groove (20).
EFFECT: higher adhesion of tire.
7 cl, 6 dwg
FIELD: motor industry.
SUBSTANCE: tyre has tread surface equipped with multiple circular grooves (2, 4), which pass continuously in circumferential direction. Circular grooves (2, 4) each are equipped with multiple transverse grooves (7, 8), every of which has one end, which communicates to circular groove, and other end that ends in section (7, 8) of contact with earth surface, independently on other circular grooves, at the same time other transverse grooves are communicated to other circular grooves or with tread surface, which contacts with earth. Circular grooves (2, 4) and transverse grooves (7, 8) have, each, width, which is previously selected so that opposite walls of grooves do not contact with each other with such condition of tyre, when it is mounted on suitable standard rim, filled with air at maximum pressure and is loaded with weight, which corresponds to maximum bearing capacity of tyre. Width of specified transverse grooves, at least locally makes at least 30% of width of specified circular grooves. Each of specified transverse grooves has length, which makes at least 40% of length of specified circular grooves extension on specified surface of contact with earth.
EFFECT: reduced level of tyre noise.
6 cl, 10 dwg
FIELD: tire industry; heavy-weight truck tires.
SUBSTANCE: proposed tire tread with relief pattern is formed by two circumferential grooves. Said grooves are limited by two ribs of mean width containing great number of cuts whose contours on contact surface, when non-worn-out, are arranged between two points of intersection A and B, AB segment forming angle α not exceeding 40° in cross direction of tread. Each cut 7 of mean width E contains sequence of sections of cut. Some of said sections of cut over entire surface parallel to contact surface in non-worn-out state and enclosed between surface in non-worn-out state and 2/3 of maximum depth of cut have contours forming mean angle β not exceeding 15° in longitudinal direction of tread.
EFFECT: increased tire life.
8 cl, 7 dwg
SUBSTANCE: invention relates to rodless tire tread pattern for motion on ice and snow. Tread surface has sections of contact with road cover composed of ribs divided by several main grooves, and/or multiple contact sections composed of blocks divided by grooves over tire width. Cutouts or minor openings are made on contact sections as well as multiple ledges with height smaller than depth of said cutouts. Note here that ledges are arranged to make the pattern whereby water drain channel width increases at crossing of water drain channels while water drain channels arranged in the form of mesh between ledges converge in smaller direction of the three directions. Relationship between area of multiple ledges and that of road contact surface (block-shaped) makes 0.5 or larger and 0.9 or smaller.
EFFECT: higher safety and reliability in motion on rod and ice.
5 cl, 5 dwg, 1 tbl
SUBSTANCE: invention relates to non-studded automotive tires. Multiple transverse grooves 18 are made on tread sett surface 10. Grooves 18 have ledges 22 arranged on the surface of groove first wall while recesses 24 are made on groove second wall and shaped to match with said ledges. Contraction of elements 16a of tread sett 16 separated by grooves 18 is decreased due to interaction between ledges 22 and recesses 24. Height H1 of ledges 22 arranged at top part of grooves 18 exceeds height H2 of ledges 22 located at bottom part of said grooves.
EFFECT: reduced excess rigidity, better braking on ice.
20 cl, 5 dwg, 2 tbl
SUBSTANCE: invention relates to automotive industry. Direction of tire rotation is set in pneumatic tire. Multiple narrow grooves are made in tire parts that stay in contact with soil. Each said narrow groove is shaped to, in fact, zigzag line composed of the chain of, in fact, V-like tread sections. Lowerable magnitude of tire parts that stay in contact with soil in direction of tire rotation differs from that of said parts in reverse direction, that is, against external force generated when tires lowers onto soil. Besides, direction of V-parts of every narrow section is set to make said lowerable magnitude of tire parts that stay in contact with soil in direction of tire rotation is smaller than that of said parts in reverse direction.
EFFECT: improved braking properties.
5 cl, 6 dwg, 1 tbl
SUBSTANCE: invention relates to winter tires. Tire comprises two central lengthwise grooves. It comprises also first transverse grooves connected with central lengthwise grooves and have inclination varying to opposite in tire lengthwise direction. It has second transverse grooves extending from central grooves toward edges of tire tread, their inclination opposed to equator both sides across the tire. Two shoulder lengthwise grooves that, along with central lengthwise grooves and second transverse grooves, confine tire blocks. Also its has auxiliary grooves crossing said blocks in lengthwise direction to connect second transverse grooves and extend in direction orthogonal to transverse groove inclination.
EFFECT: better characteristics on snow.
3 cl, 2 dwg
SUBSTANCE: invention relates to automotive industry. Tire carcass ply is laid between two double beads. Breaker ply is recessed on carcass ply outer peripheral side in tread section. Tread is provided with multiple main grooves extending along tire circle. Maximum depth of each main groove varies from 8.5 mm to 15.0 mm. Relationship between height of actual tire profile SH and that of profile SHstd calculated from tire size is set to 0.97≤α≤0.99. Relationship between contact areas makes 65-70% under conditions of measurements whereat air pressure makes 200 kPa and load making 50% of bearing capacity at said air pressure. Mean contact pressure P varies from 300 kPa to 400 kPa.
EFFECT: longer life, efficient braking on moistened surface.
13 cl, 4 dwg, 1 tbl
SUBSTANCE: invention relates to automotive industry. Tire crown 16 has central row 30 of blocks and second rows 32A, 32B arranged on both sides from said central row over the tire width. Central grooves 24P, 24Q of grouser are arranged in central row 30 with alternating directions of inclination relative to direction over tire width. End sections 25P of central groove rear end side of grouser in contact with soil are located in blocks 33.B of second row of blocks 32B while end sections 25Q of rear end side of central groove 24P in contact with soil are located in blocks 33 of second row 32A of blocks.
EFFECT: improved tire performances on ice and snow.
3 cl, 1 dwg
SUBSTANCE: invention relates to automotive tire to be used on ice- or snow-covered roads. Slit-like drain grooves 11X made in rib 5 in the tire equatorial plane (TE) are formed with such shape that degree rib 5 is flattened by external force to, is smaller in tire rotational direction than that in opposite direction. Every block 10 in each shoulder zone 1S has slit-like drain grooves 11Ma in section 10A of the block pressed-in side features such 3D shape that makes block 10 with drain grooves 11Ma, when flattened by external force, smaller in direction of tire rotation compared with direction opposite the tire rotation. Every block 10 in each shoulder zone 1S has slit-like drain grooves 11Ma in section 10A of the block pressed-in side features such 3D shape that makes block 10 with drain grooves 11Ma, when flattened by external force, smaller in direction opposite the tire rotation compared with direction of tire rotation.
EFFECT: better braking properties on ice, reduced wear.
4 cl, 5 dwg
FIELD: automobile industry.
SUBSTANCE: this invention covers tread design of an automobile tyre including tread 2 equipped with at least 6 bulge rows (R1-R4), where each bulge (B) is equipped with slots of min. 3.0 mm depth, while bulge rows include at least 2 rows of crown area (CR) located at crown area Ac stretching from center line (C) of a tire being its center, so that its width is 50% of tread width (TW), and at least 2 bulge rows of shoulder area (Sh) located at each external side from bulge rows of crown area (CR). Lateral grooves 4 equipped in a bulge row are inclined oppositely to the axis with lateral grooves provided in maximum adjoining bulge row.
EFFECT: improvement of tire stability during braking action at icy and snow road surfaces.
4 cl, 8 dwg
FIELD: automobile industry.
SUBSTANCE: this invention covers tread design of an automobile tyre including tread 2. Tread design has a pair of middle annular grooves 3b each of which is located at the distance of 15-20% tread width (TW) from center line (С) of the tread to ensure crown area (CR) between middle grooves 3b and a pair of shoulder areas (Sh) between middle groove 3b and limit (E) of ground contact where (CR) includes rows R1 and R2 of bulges (B) with slots (S) and limited by meander inner annual grooves 3a and lateral grooves 4a and 4b of (CR). Each shoulder area (Sh) includes rows R3 and R4 of bulges (B) with slots (S) and limited by linear outer annual grooves 3c and lateral grooves 4c and 4d of Sh. Gs portion (%) of the grooves area in shoulder (Sh) exceeds Gc portion (%) of the grooves area of crown area (CR), so that Gs-Gc differential is equal to 3-7%.
EFFECT: improvement of tire quality at icy and snow road surfaces.
6 cl, 7 dwg
SUBSTANCE: invention relates to automotive industry. Two first main grooves running along tire circumference are made in tread central zone. Another two main grooves running along tire circumference are made on both outer sides of the first two main grooves. First raised groves and second raised grooves are arranged to alternate along tire circumference so that said first raised grooves run inward in lateral direction of the tires from the end of tread each shoulder zone to communicate with appropriate one of the first main grooves. Second raised groves and second raised grooves are arranged to alternate along tire circumference so that said first raised grooves run inward in lateral direction of the tires from the end of tread each shoulder zone not to communicate with appropriate one of the first main grooves. Tread central rib is made to run between said two first main grooves. Some blocks of shoulder zone are located between every second main groove and appropriate one end of shoulder zones, and some intermediate blocks of shoulder zone are located between second main groove and one adjacent first main groove. Intermediate blocks of shoulder zone incorporated long blocks running along tire circumference for distance equal to that of two intermediate blocks.
EFFECT: improved performances on ice-covered and wet roads.
9 cl, 5 dwg
SUBSTANCE: invention relates to automotive industry. Tire 1 comprises tread 2 with pattern 3 including first and second pattern extending along tire circle to make module 5 with smaller pattern spacing and module 8 with larger pattern spacing. Note here that all modules comprise first groove 15 with initial section 32 and section 34 with larger cross-section, both sections extending from outer axial first end 30 toward opposite axial second end 31. Note here that section 34 is dead section on, at least, it iner axial side in zone of contact spot. Initial section and that with larger cross-section have first width W1 and second width W2, respectively, and feature module 5 W2-to-W1 ratio exceeding that of module 8.
EFFECT: higher tire rod grip.
36 cl, 2 dwg