Air tire with radial cord

FIELD: transport.

SUBSTANCE: proposed tire comprises directed patter defining the direction of tire rotation and at least one crosswise groove on tread surface extending from tread edge and inward in direction over tread width beyond central point P of tread width half. Here this tread edge is located whereat groove wall of expulsion side has of at least one crosswise groove has the ledge. The latter extends towards inlet side groove wall relative to point Q. The latter represents the mid distance, over tread width, from tread edge to point P of tread width half. Note here that said ledge extends from position between points P and Q and inward beyond point Q in direction over the tread width.

EFFECT: higher resistance to abrasive wear.

4 cl, 6 dwg, 1 tbl

 

The object of the present invention is a pneumatic tire with a radial arrangement of cords, and more specifically, a pneumatic tire for construction engineering machines with increased resistance to abrasive wear.

Typically, tires for construction vehicles (dump trucks, etc.), working mainly on construction sites, in mines, etc., to improve the wear resistance have an increased volume of tread rubber provided by increasing the thickness of the tread, or, alternatively, by reducing negative attitudes.

However, since tires for construction vehicles used to operate these vehicles at relatively high speeds, there could be a bus output down due to heat dissipation in the crown area of the tire. Such a failure of the tire was the problem, in particular for the above-mentioned tire with a large volume of tread rubber.

For this reason, has developed technology to increase the wear resistance of the tire without increasing the amount of rubber from the tread (see, for example, patent documents 1, 2).

There is also known a method of creating a tread with directional pattern, and a transverse groove in the form of a parallelogram with the aim of ensuring the possibility of a gradual exit from the Central part of the tread.

When the mouth�Ofce superalloy tires ORR on the front wheel of the vehicle, because of the shift of the belt rolling of the tire, increases the shear stress at the point corresponding to 1/4 of the width of the tread, and there is a significant slippage of the tread at the start of the movement or when you start pushing. However, using the above method, the slippage in the width direction of the tread may be impaired.

Patent document 1: JP 2007-083822 And

Patent document 2: JP 2007-191093 And

However, the wear resistance provided by the above method is insufficient, and thus, it was necessary to further increase the wear resistance.

The present invention for solving the aforementioned problems is aimed at creating a pneumatic tire with a radial arrangement of the cord, with high wear resistance.

To solve the above problems have been thoroughly conducted multiple research.

As a result, the applicant is, by setting the direction of rotation of the tire, and considering separately the input and repulsive side bus, came to the conclusion that the protrusion formed on the wall of the transverse grooves with the repulsive part, provides the desired result.

The present invention was created based on the new information received and its novel aspects.

The first aspect of the present invention is Pneumatics�th tire with a radial arrangement of the cord, containing:

directional pattern, determining the direction of rotation of the tire; and

at least one transverse groove in the tread surface of the tire extending from the edges of the tread and extending inward in the width direction of the tire in the center point P of half the width of the tread, which is the edge of the tread, characterized in that

the wall of the groove on the repulsive side at least one transverse groove has a projection, extending into the side wall of the groove on the input side, and

relative to the point Q representing the middle of the distance (in the direction across the width of the tread) from the edge of the tread to the center point P of half the width of the tread, the said protrusion is located on the position between point P and point Q inside for a point Q in the direction across the width of the tread.

A second aspect of the present invention is a pneumatic tire with a radial arrangement of the cord according to the first aspect, comprising an annular groove extending in the Equatorial plane of the tire in the circumferential direction of the tread, which also contains at least one transverse groove, which moves outward from the specified annular grooves in the width direction of the tread and remains within the surface of the tread.

A third aspect of the present invent�tion is a pneumatic tire with a radial arrangement of the cord according to the second aspect, characterized in that the transverse groove at least partially overlaps the transverse groove when projecting in the circumferential direction of the tire.

In the present description, the term "overlap" refers to the case when the overlap width is 0 mm.

The fourth aspect of the present invention is a pneumatic tire with a radial arrangement of the cord according to the third aspect, characterized in that the overlapping region of the transverse grooves and transverse grooves is from 0 mm to 20 mm in the width direction of the tread.

According to the present invention, it is possible to create a pneumatic tire with a radial arrangement of the cord with excellent abrasion resistance.

The tire according to the present invention is particularly suited for use on construction machines working on construction sites, in mines, etc., the tire which require high wear resistance.

The invention is illustrated by drawings on which is shown:

Fig.1 shows a developed view showing a tread pattern of the tyre according to one possible embodiment of the present invention;

Fig.2 shows a view in section along the line a-A in Fig.1;

Fig.3 presents a detailed view showing the figure protect�RA tire according to another embodiment of the present invention;

Fig.4 shows a developed view showing a tread pattern of the tire according to another possible embodiment of the present invention;

Fig.5 presents a detailed view showing the pattern of control pattern of the tire tread; and

Fig.6 presents a detailed view showing the pattern of the standard sample of tire tread.

Below is a detailed description of the present invention with reference to the accompanying drawings.

It should be noted that the internal structure and the same parameters of the tires are similar to the conventional tire, and therefore their description will be omitted.

Fig.1 shows a developed view showing a tread pattern of the tyre according to one possible embodiment of the present invention.

As shown in Fig.1, the tread pattern is a directional pattern, determining the direction of rotation of the tire. Fig.1 shown by the arrow direction marked "set direction of rotation" is the direction in which to rotate the tire (in other words, the input side of a bus).

In addition, as shown in Fig.1, the tire according to the present invention has at least one transverse groove 2 on the surface of the tread 1 of the tire extending from the edges of THE protector and extending in the direction�of the width of the tread to a point (called 1/4 of the width of the tread), which is located at the point R, which is the middle half of the width of the tread.

In the illustrated embodiment of the invention, the tire has a total of 6 of the transverse grooves 2, three transverse grooves 2 on each half of the width of the tread to the sides of the Equatorial line of the tire to one of the edges of the tread.

Further, the wall 2A of the groove on the repulsive side, at least one of the transverse grooves 2 has a projection 2C, extending into the side wall grooves 2b on the input side.

All six transverse grooves shown embodiment of the invention, the wall 2A on the repulsive side of the transverse grooves 2 are the projections 2C, outstanding in the side wall 2b on the input side.

Here, in the direction across the width of the tread, the point Q is the midpoint (called 3/8 tread width) the distance from the edge protector to the above center point P of half the width of the tread.

In this position, the protrusion 2C protrudes from the position between point P and point Q in the inside direction from the point P in the width direction of the tread.

That is, at least one of the transverse grooves 2 has a narrowed portion at the location of the protrusion 2C. Namely, the width of the transverse grooves in the area where a projection 2C is narrower than the width of the groove in an area where there is no protrusion 2C.

�according to the present invention, as indicated above, it is important that the wall of the groove on the repulsive side, at least one of the transverse grooves, had the ledge to the outstanding wall of the groove on the input side, and that relative to the point Q representing the middle of the distance (in the direction across the width of the tread) from the edge of the tread to the center point P of half the width of the tread, the ledge was located from the position between point P and point Q inside for a point Q in the direction across the width of the tread.

According to the present invention is primarily the task of the direction of rotation of the tire allows to consider separately the input and repulsive side.

In this regard, the surface of the soil makes a significant slippage in the circumferential direction of the tire at the contact surface of the tread divided by the input side of the transverse grooves. Accordingly, the formation of a ledge at the above location and closure of transverse grooves during its contact with the ground gives the possibility of reducing slippage of the contact area of the tread in the circumferential direction of the tire to the point of repulsion. This makes it possible to improve wear resistance of the tire.

In particular, since the protrusion is formed in the above region in the direction across the width of the tread, it is possible to achieve reduction of abrasive isocaproate close to 1/4 of its width.

Fig.2 shows a view in section along the line a-A in Fig.1.

Fig.2 shows the form of transverse grooves or protrusions when installing the tires on the prescribed rim and pumped it with air to a predetermined internal pressure no-load.

As can be seen from Fig.2, the surface 2d of the wall above the ledge is preferably parallel to the cut surface 2b of the wall on the entry side of the transverse grooves 2.

The reason is that when the contact of the tire with the ground surface transverse grooves come into hard contact with each other, thereby further reducing the tyre to slip in the moment of take-off in above-mentioned contact area.

Thus, as shown also in Fig.2, the bottom of the groove is preferably formed so that the 2d projection and the bottom of the grooves are smoothly connected to each other.

It should be noted that "prescribed rim" is a rim specified in the Annual guide JATMA 2008", published by JATMA (the Association of manufacturers of automotive tires Japan), and "specified internal pressure" is an air pressure corresponding to maximum load (maximum load), also specified in the "Annual list of the JATMA 2008". Note that in other countries (outside of Japan), the internal pressure is the pressure of the air inflation corresponding to the maximum on�ruske (maximum capacity) of one wheel, defined by the above standards, and the rim is a standard rim (also "approved rim" or "recommended rim") of the appropriate size, as determined by the above standards. Standards are defined in accordance with industry standards in each area. These standards include, for example, the standards defined by the "Annual guide TRA", published by "Tire and Rim Association Inc." for the United States, or "Collection of normative materials ETRTO European technical organization for tire and rim", produced by ETRTO in Europe.

In addition, as shown in Fig.2, the minimum distance d (mm) between the wall surface 2d of the above ledge and the wall surface 2b on the input side of the transverse groove 2 is preferably from 15% to 30% of the width W (mm) transverse grooves.

The reason is that with minimum distance d is greater than 15% can be obtained good characteristics, such as wear and heat dissipation.

In addition, when the minimum distance d is less than 30% is provided by the closure of the transverse grooves in the moment of contact with the ground, thereby reducing the above-mentioned slippage of the tire in the circumferential direction.

Further, the tread width of 2L (mm) represents the linear distance in width between the two edges prot�ktora when installing the tires on the prescribed rim and when prescribed by internal pressure without load.

At this time, the protrusion is preferably formed in the region in the width direction, comprising the middle half of the width of the tread, and more preferably, in the region in the direction across the width of at least 40% to 60% of the width L (mm) half of the tread from the Equatorial plane CL of the tire.

The reason is that the protrusion formed in the above region, can provide further reduction of abrasive wear in the field about 1/4 of the width of the tread where the greatest slip tread surface in the circumferential direction of the tire.

Also, as shown in Fig.2, the protrusion is preferably located in the region of at least 80% to 100% of the depth H (mm) transverse grooves.

It should be noted that the depth of the transverse grooves is a in depth, which is the indicator of tread wear.

This is because the ledge in this area, effectively reduces slippage around the circumference of the tire at the time of the repulsion of the contact surface with the ground, divided by a transverse groove.

Further, as shown in Fig.1, it is desirable to avoid the formation of an acute angle in the region of the contact surface, having connected with it above the ledge to reduce cracking or chipping of the rubber in the area of the surface conta�TA.

In addition, as shown in Fig.1, the transverse groove 2 preferably is tilted sideways to the specified direction of rotation of the tire from the edge of the tread inward in the width direction of the tread.

The reason is that when the lateral groove is gradually receding from the Equatorial plane of the tire, it also provides the possibility of reducing slippage of the tire in the width direction.

Further, the above-mentioned angle of inclination and transverse grooves is preferably from 5° to 45° relative to the direction across the width of the tread.

In addition, the inner end portion of the transverse grooves in the width direction of the tread is preferably located on the inner side (in the direction across the width of the tread) from the point (0,4 L (mm) from the Equatorial plane CL of the tire to the outside in the width direction of the tread.

As mentioned above, the protrusion is preferably performed in the field (in the direction across the width of the tyre) at least 40% to 60% of the half tread width L (mm) from the Equatorial plane CL of the tire. Accordingly, for the formation of the ledge in this region, the transverse groove preferably runs inside from the point of 0.4 L (mm) outside (in the direction across the width of the tread) from the Equatorial plane CL of the tire.

In addition, as shown in Fig.1, the transverse groove is preferably� perpendicular to the edge of THE tread.

Due to this, the bottom of the transverse grooves can have a greater curvature, which reduces the number of cracks occurring from the bottom of the grooves.

As shown in Fig.3, according to the present invention, it is also preferable to have an annular groove 3 extending in the circumferential direction of the tread in the Equatorial plane CL of the tire, and at least one transverse groove 3A, which departs from the annular groove 3 to the outside in the width direction of the tread and remains within the tread surface 1.

Thus, the air flowing through the annular groove when the tire's rolling may enter a transverse groove, providing increased heat dissipation in the entire Central region in the width direction of the tire, where there is a significant dissipation, and improving the heat resistance of the tire.

Here, when the point R represents the middle (in the direction across the width of the tread) of the region between the Equatorial plane CL of the tire and above the point R, the transverse groove preferably takes place in a region from the position 10 mm inside from the point R in the direction of width.

In addition, when projecting transverse grooves in the circumferential direction of the tire, the transverse groove is preferably at least partially overlaps the transverse groove. In other words, the transverse groove is preferred�Uo comes from the position on the outer edge of the transverse grooves in the width direction of the tread inside the transverse grooves in the width direction of the tread. This provides additional heat dissipation in the Central part (in the width direction) of the tread.

At the moment the length of the overlap E (mm) in the width direction is preferably 20 mm or less, whereby it may be secured stiffness of the contact area with the ground.

In addition, as shown in Fig.3, from the point of view of ensuring the rigidity of the contact area with the ground, the transverse groove and the transverse groove should preferably be parallel to each other.

Further, as shown in Fig.3, the annular groove and the transverse groove is preferably connected to each other at right angles.

This ensures the flow of rubber mass during vulcanization.

It should be noted, in accordance with the present invention, in particular, it is possible to make a tyre with deep grooves with a diameter of 1.5 mm tread or more relating to the protectors of the class E-3 or higher according to the classification of the Association of manufacturers of automotive tires Japan, company "Tire and Rim Association, Inc.", etc.

Samples

In order to determine the beneficial effects of the present invention, samples were manufactured tires 1 and 2 according to the present invention with a projection on the wall of the transverse grooves on the repulsive side, outstanding in the side wall of the groove on the input side.

To�ome, were control samples made of tires with a tread pattern similar to the tread patterns of samples 1 and 2, but without the above-mentioned protrusions (shown in Fig.5).

In addition, as a standard sample was made tyre with a tread pattern shown in Fig.6.

Characteristics of all samples of the tires are shown in table 1.

In this table 1, the term "length transverse grooves" means the length of the transverse grooves in the width direction of the tread. In addition, the term "angle of inclination of the transverse grooves" refers to the angle of inclination of the transverse grooves relative to the direction across the width of the tread. Further, the term "protrusion" means a part, projecting from the walls of the transverse grooves with repulsive side to side in the wall of this groove on the input side, as mentioned above.

It should be noted that the full depth of the transverse grooves of all samples tyres is 68 mm.

Each of the above tires in size 46/90R57 was mounted on a prescribed rim, inflated with air to a predetermined internal pressure and is installed as the front wheel of the vehicle. Then were tested for wear resistance.

Durability

Tests were carried out on a rotating drum to measure the characteristics of the vehicle with each of the three higher�'s samples tyres at 80 km/hour with mileage 30000 km.

Evaluation of wear resistance was performed by measuring the depth of the groove remaining after carrying out the above test on a rotating drum, and a value of the wear resistance was expressed using the index of relative wear resistance of a standard tyre, the index which was taken equal to 100. A lower index value indicates a higher wear resistance of the tire.

The test results are shown in table 1 below.

As can be seen from table 1, the abrasion resistance of samples 1 and 2 is higher than the wear resistance of standard and reference samples.

1. Pneumatic tyre with radial location of the cord that contains:
- directional pattern, determining the direction of rotation of the tire; and
- at least one transverse groove in the tread surface of the tire extending from the edges of the tread and extending inward in the width direction of the tire in the center point P of half the width of the tread, which is the edge of the tread, in which
the wall of the groove on the repulsive side at least one transverse groove has a projection, extending into the side wall of the groove on the input side, and
- relative to the point Q representing the middle distance, in the direction of the tread width, from the edge of the tread to the center point p of the half-width �of rotector, wherein said protrusion is located on the position between point P and point Q inside for a point Q in the direction across the width of the tread.

2. The tire according to claim 1 comprising an annular groove extending in the Equatorial plane of the tire in the circumferential direction of the tread, which also contains at least one transverse groove, which moves outward from the specified annular grooves in the width direction of the tread and remains within the surface of the tread.

3. The tire according to claim 2, in which the transverse groove at least partially overlaps the transverse groove when projecting in the circumferential direction of the tire.

4. The tire according to claim 3 in which the overlapping region of the transverse grooves and transverse grooves is from 0 mm to 20 mm in the width direction of the tread.



 

Same patents:

FIELD: transport.

SUBSTANCE: invention relates to the automotive industry. A tyre frame being a tyre base, and a vulcanised tread which is glued to the tyre frame, are formed separately and connected to each other, forming the tyre. The tread, in its cross (axial) direction, has a set of grooves passing in its longitudinal (circumferential) direction. The tread thickness in the cross section gradually decreases from the equator to the edge from the side of the equator of the extreme external groove located in axial and extreme external area and is gradually increased from the external edge of the extreme external groove outside in the axial direction.

EFFECT: possibility of the regulation of uneven wear of the tread.

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FIELD: transport.

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FIELD: transport.

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EFFECT: better bite.

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Pneumatic tire // 2524522

FIELD: transport.

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FIELD: transport.

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EFFECT: enhanced performances.

15 cl, 19 dwg

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FIELD: transport.

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9 cl, 5 dwg, 1 tbl

Pneumatic tire // 2520265

FIELD: machine building.

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

EFFECT: better road grip on dry road and snow.

7 cl, 4 dwg

Pneumatic tire // 2548308

FIELD: transport.

SUBSTANCE: invention relates to tire tread. Pneumatic tire (10) tread (12) comprises two peripheral main grooves (14) made nearby the tire width centre some 1/3 of width W of the surface of contact with soil from edge (7) of said surface and oriented towards tire circumference. Central tread (16) arranged between two peripheral main grooves (14). Side grooves (18) are made on sides over tore width outside both peripheral main grooves (14). Main crosswise grooves (20) are arranged in side treads (18) extending from peripheral main grooves (14) to edges T of the surface of contact with soil. Side treads (18) include no main grooves to connect adjacent main crosswise grooves (20) with each other.

EFFECT: higher adhesion, better stability of control and acceleration characteristics on ice.

3 cl, 2 dwg, 2 tbl

FIELD: transport.

SUBSTANCE: invention relates to the automotive industry. A tyre frame being a tyre base, and a vulcanised tread which is glued to the tyre frame, are formed separately and connected to each other, forming the tyre. The tread, in its cross (axial) direction, has a set of grooves passing in its longitudinal (circumferential) direction. The tread thickness in the cross section gradually decreases from the equator to the edge from the side of the equator of the extreme external groove located in axial and extreme external area and is gradually increased from the external edge of the extreme external groove outside in the axial direction.

EFFECT: possibility of the regulation of uneven wear of the tread.

6 cl, 7 dwg

Pneumatic tire // 2523539

FIELD: transport.

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

EFFECT: improved characteristics.

17 cl, 1 tbl, 10 dwg

Automotive tire // 2521033

FIELD: transport.

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

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

20 cl, 4 dwg, 1 tbl

Pneumatic tire // 2520265

FIELD: machine building.

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

EFFECT: better road grip on dry road and snow.

7 cl, 4 dwg

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 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

Pneumatic tire // 2507083

FIELD: transport.

SUBSTANCE: invention relates to tread of tires to be used in winter equipped with antiskid studs. Proposed tire comprises tread with lengthwise blocks. Note here that said blocks comprises drilled blocks, each being provided with not-through hole to fit the stud therein. Said not-through hole is shifted towards the edge of drilled block. Raised not-through reinforcing part is made so that wall thickness (t) makes at least 5 mm for wall around said hole. Said blocks including drilled blocks feature identical geometry apart from said raised reinforcing part.

EFFECT: better run on ice and snow, sufficient life.

12 cl, 7 dwg, 1 tbl

Winter tire // 2482971

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, namely, to winter tire tread pattern. Proposed tire comprises tread with circular central region wherein blocks are located as symmetric pattern on opposite sides of circular equatorial plane of the tire. Said blocks located in symmetry on opposite sides of said central plane comprises multiple spaced apart and extending across wavy segments. Separate pairs of adjacent segments are connected by one or several circular grooves. Wavy segments comprise areas of variable depth and one or more deeper area and one or more areas not that deep. Aforesaid circular groove connecting the pair of adjacent wavy segments on opposite ends of the groove cross wavy segments in areas not deep.

EFFECT: better tread adhesion in winter.

15 cl, 11 dwg

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, namely, to winter tire tread pattern. Tread central area comprises reiterating circular row of first V-like recesses arranged at central plane. Note here that every V-like recess comprises first recess branches diverging in first circular direction and reiterating row of second V-like recesses at central plane and including second recess branches diverging in circular direction opposite the first one. Every said V-like recess is overlapped by multiple opposed second V-like recesses. Branches of first V-like recesses feature depth varying with length from 2 to 7 mm at top section of the branch at the center to branch end. Branches of first V-like recesses vary in width, like in length, from narrower top branches to wider medium branches and, further, to narrower end section so that branch volume per unit length does no vary.

EFFECT: better tread adhesion in winter.

18 cl, 11 dwg

Pneumatic tire // 2548308

FIELD: transport.

SUBSTANCE: invention relates to tire tread. Pneumatic tire (10) tread (12) comprises two peripheral main grooves (14) made nearby the tire width centre some 1/3 of width W of the surface of contact with soil from edge (7) of said surface and oriented towards tire circumference. Central tread (16) arranged between two peripheral main grooves (14). Side grooves (18) are made on sides over tore width outside both peripheral main grooves (14). Main crosswise grooves (20) are arranged in side treads (18) extending from peripheral main grooves (14) to edges T of the surface of contact with soil. Side treads (18) include no main grooves to connect adjacent main crosswise grooves (20) with each other.

EFFECT: higher adhesion, better stability of control and acceleration characteristics on ice.

3 cl, 2 dwg, 2 tbl

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