Tire for all-wheel drive off-roader

FIELD: transport.

SUBSTANCE: invention relates to extra-low-pressure tires of transport facilities to be used on transport facilities moving off-the-road and over low-strength soils. The tire contains carcass with shell the thickness of which is made essentially constant and provided with central tread section. The shell thickness is 0.007-0.030 of tire section height.

EFFECT: better grip of off-roader tire over low-strength soils without destruction of surface layer, higher speed of travel on hard-surface roads lower noise.

12 cl, 9 dwg

 

The invention relates to tires of vehicles, primarily to the inflatable pneumatic tires and, in particular, to the low pressure tires, designed for use on all-terrain vehicles moving on the road and soils with low bearing capacity.

Known designs of pneumatic tyres (see, for example, Tires and wheels Vigneras, Evilenko. - M.: Mashinostroenie, 1975. - 184, and article V.A. Petruseva and other Multi-wheel-drive cars on the arched tires or pneumatic with low tire pressure, p.9-10). They are characterized by insufficient adhesive properties and permeability of the soils with low bearing capacity, since these tires have a sub-optimal size, shape and elasticity, and high, more than 0.5 kgf/cm2internal pressure. Moreover, due to the excessive introduction they have devastating effects on the soil.

Pneumatic tire, the width of which exceeds the height of her profile that contains a Board with frame rings, side walls and a running part of the frame of the cord wrapped on the frame ring (Bocharov NF and other vehicles on highly elastic, propellers, M.: engineering, 1974, p.9), has considerable destructive power and high rolling resistance, since the specific pressure in the zone of its contact with g is a flying boot is unevenly distributed because of the high rigidity of the frame.

Monolithic tubeless tire low pressure according to EN 115198 is designed to achieve high flotation and traction properties on soft and moist surfaces in the shape of the arch, however, due to the relatively rigid frame and high protector has a large mass and low-set Board (low profile) does not allow the regulation of the pressure in the tire.

Pneumococci US 2802541, 2966223, 2990026, 3023826, 3024830, 4007801, 4206797, 4359122, 4360073, 4589460, 5078192 and 5946831 have a high load carrying capacity in soft soils, but due to the large width of the running part is difficult to perform suspension and to carry out the steering, they also require special actuator (see, for example, the drive rollers of the trolley according to US 3744585), all this unnecessarily complicates the design.

Bus US 4538657 variable contact patch, able to move across different surfaces, adapting to the specific conditions, however its installation on a dedicated disk limits the scope of its application and reduces functionality.

Widely known propellers made of cells-membranes, without protector (see US 1394328 and 4146992), as well as tires of wheeled vehicles "Chukotka" and "Toros" (see, for example, http://www.ec-arctic.ru). They have low weight and ease of manufacture, however, the scope of these engines is limited due to low coupling properties, h is sufficient stability on hard surfaces and low speed of movement, and thin-walled Luggage prone to punctures.

Tire low pressure for all-terrain vehicles on EN 2095256 is a torus, with a three-layer walls, twined in the meridional direction of the flexible flat ribbon. It is simple to make, but the lack of tread dramatically reduces its functionality.

Propulsion for US 2821949 has a cross vanes on the entire width of the running part, it facilitates the movement on wet surfaces (e.g., swamp), but excludes the movement on hard surfaces.

Performing tyre for US 6401774, 6533007, 6929044 with distinct longitudinal grooves, as well as the separation of the tread longitudinal groove in the middle of the tire for US Des.345950 and 308038, improves traction and self-cleaning, but poorly resists lateral offsets.

In all terrain tire for US Des.384013 Central lug is separated from the peripheral and the hooks of the side walls of the longitudinal grooves, which improves directional stability, but essentially uniform distribution of the tread on the running part reduces the cross.

The tread on US Des. 305630 and 504103 divided into five longitudinal grooves between the lugs, staggered, and the size of the checkers is reduced to one side. This simplifies the manufacturing technology, however, this embodiment reduces the resistance is R in the transverse direction when the movement on the slope.

The location of the grooved faces of the lugs of the tires on EN 39348 and 40529, as well as the Central canal to US 6189586, 6250353, Des.261257 and tires with protection from punctures US 7048022 zigzag improves traction properties, but low elasticity of these tires leads to devastating effects on the soil, and consequently reduces the cross.

The tread pattern on EN 47529, characterized by the alternation of long and short edges over the number in the circumferential direction and location of the ribs on the arc with an angle decrease from 50 to 25° from the center to the edge of the treadmill relative to the Meridian, facilitates purification, but this tyre behaves badly on soils with low bearing capacity.

Coordination of the direction of rotation of the tire and position (direction) of the tread (see EN 41560, 1372778 and US Des. 512957) increases traction properties, in contrast to the uniform distribution of the tread of the running of the US 4253512, 2005139303 and Des. 275383, but does not increase functionality.

The tread pattern for low profile tires on EN 35492 has greatly thinned Central track portion and increasing towards the periphery of the saturation of the tread. This arrangement leads to uneven pressure distribution in the contact patch when driving on lebanesse soils, and prevents the purification and creates increased noise in movement the AI on the solid support surface.

Known pneumatic tyre for snegourotchka on EN 50470, the width of the profile which is equal to or less than the height, consisting of the tread lugs and frame. In this case, the tire is made of rubber coated fabric with the number of layers from one to four, with layers wrapped on the side of the ring, and the inner surface of the frame holes, repeat the configuration and arrangement of the elements of the tread. This embodiment of the inner surface of the tire carcass complicate the technology of its manufacture, and the variable height of the lugs increases rolling resistance.

Also extends the functionality of the protector extra-low pressure tires on EN 52774, lug type "tree", directed at an angle to the Equatorial plane and separated by grooves with edges U-shaped form, wherein the tread grooves are oriented in the longitudinal direction at an angle of 45° to the Equatorial plane, and the grooves of the side lugs are oriented in the longitudinal direction at 90° to the Equatorial plane. Running tread with spaced relative to each other by a lug formed in the transverse ribs on the type of "slash Christmas tree", the position of the lug in the Equatorial zone in each edge at an angle of 45° to the Equatorial is locoste and location of the lugs staggered overlapping depressions between lugs one series promotes self-cleaning, however, insufficient increases performance on soils with low bearing capacity.

Low profile low pressure diagonal pneumatic tire according to EN 74857, the ratio of the width of the profile to which its height is 0,596 at a nominal internal pressure of 0.5-0.6 MPa, consisting of the tread lugs and frame are made of rubber coated fabric, side, layers of cords in which turned up on the side of the ring. In the lunge frame and sides are used nylon cord, between the layers of the frame is placed a rubber layer. This helps keep promotergene bus when the pressure drops below a preset and preserve the carrying capacity of the tires, however, leads to a significant introduction of propulsion in the soil, which reduces permeability and affects its sustainability. Running tread with checkerboard elements forming the Central, two lateral and three shoulder ribs, separated from each other by longitudinal grooves which are symmetrical relative to the center of the treadmill, promotes uniform load distribution in the contact patch, however, this distribution of the elements of the tread width of the running part irrational when driving on soils with varying load capacities and overcome water obstacles. In addition, the drafting of the side edges of the diamond-shaped Shasha is, staggered with respect to the Central rib, the upper and lower faces of the sticks is rotated relative to the axis of rotation at an angle of 45°, and the shoulder ribs formed checkers respectively l-shaped, square and rectangular shape, the side faces are parallel, reduces rolling resistance and improves grip, but greatly complicates the manufacture and reduces directional stability.

While there are numerous embodiments of the carcass and the tread of the tires of low pressure, there is no simple and reliable construction of pneumatic tires with enhanced functionality, capable of without destruction of the surface layer to provide movement of the vehicle on soils with very low bearing capacity, as well as on roads with hard coating to increase the speed and reduce the noise.

Known tubeless pneumatic tire according to EN 2005083, the width of which exceeds the height of her profile that contains a Board with frame rings, side walls and a running part of the frame of the cord wrapped on said frame ring, the thickness of the side walls and the running part of the tire is made constant and is 0,010-0.015 height profile tires. Cord is made of nylon and laid the two intersecting at an angle of 45-60° layers.

It relates to wheeled mover of the vehicle, namely, the tubeless pneumatic tire low pressure, and can be used on the vehicles.

Since the thickness of the side walls and the running part of the tire is made constant and is 0,010-0.015 height of the tire, the pneumatic tire has no destructive effect on the surface move, but it has insufficient traction capabilities on non-cohesive soils. And because of the fact that the cord is made of nylon and laid the two intersecting at an angle of 45-60° layers, the tire has insufficient directional stability on hard surfaces.

The goal is to enhance the functionality of the mover.

Creating a simple and reliable construction of the tire-wheel drive vehicle with enhanced functionality provided by the rational execution of the shell and the location of the tread elements.

For this purpose, the tire-wheel all-terrain vehicle is equipped with a frame containing shell, the thickness of which is maintained essentially constant and component 0,010-0.015 height profile tires, equipped with a Central running part, the thickness of the shell is extended to 0.007-0,030 height profile tires.

The supply of Central running part of the tire-wheel all-terrain vehicle is equipped with a frame containing shell, the thickness of which is maintained essentially constant and accounted for the Commissioner 0,007-0,030 height profile tires, to create simple and reliable design of the pneumatic tire with enhanced functionality, because the execution of shell essentially constant significantly reduces the rolling resistance of propulsion on a variety of surfaces move, while allowing you to expand its functionality.

This also contributes to the fact that the Central track portion divided by a longitudinal groove, parallel to which the grooves between the lugs of the tread the middle of its parts.

Also contributes to the fact that the area of the outer surface of the lug, located directly on the separating grooves, essentially equal to the area of the middle and peripheral parts of the protector.

The location of the grooved faces of the lugs of the median parts of the tread zigzag and combining them with the grooved faces of the lugs of the peripheral part and the separation groove in the longitudinal direction and the location of the faces of the lugs on the radius relative to the Equatorial plane, together with the Department of lug peripheral part of the longitudinal groove from hooks sidewall improves the self-cleaning and extends the functionality of the bus.

The division of Central running of the diagonal grooves coinciding with the grooves faces grundsatz the surface of the median parts, and separating the groove from peripheral lugs, the lugs of the middle part and the separation of each additional grooves, together with access to the shell between the middle lug, and peripheral side portions of the tread grooves separating the Central lug the running part, also extends the functionality of the bus, increasing traction and improving self-cleaning.

Coordination of the direction of rotation of the tire with the direction of the grooves made on the said radii increases traction on non-cohesive soils and contributes to fluctuations in water surface.

Depicted on:

figure 1 - bus (cut);

figure 2 - Board bus;

figure 3 - the tread;

4 is a cross-section of the groove;

5 is a tread pattern (variant);

6 is a drawing of a protector (option);

Fig.7 - tread pattern (variant);

Fig - bus side view;

figure 9 - three-dimensional model of the bus.

Bus 1 (figure 1) four-wheel all-terrain vehicle is equipped with a frame 2 (figure 2) shell 3, the thickness of which is maintained essentially constant and component 0,007-0,030 height profile tires. The bus is equipped with a Central 4 running part.

The division of Central running part 4 longitudinal 5 (3) groove, parallel to which the grooves 6, 7, separating the lugs 8, 9 tread the middle of its parts, let sozdatelyu and reliable design of the tire 1 with enhanced functionality, able without destruction of the surface layer to provide movement in soils with very low bearing capacity, as well as on roads with hard coating to increase the speed and reduce the noise, since the lugs 8, 9 tread the middle of its parts are denser than separated from them by a groove in the lug 10, 11 peripheral parts, which significantly increases the adhesion of propulsion on a variety of surfaces move, while allowing you to extend the functionality. In particular, when the vehicle is on rocky terrain and swamps with wood due to expansion of the shell thickness to 0,030 height profile tires reduced the likelihood of a puncture.

Handling on hard surfaces is ensured by the fact that the area of the outer surface of the lug, located directly on the separating grooves 6, 7, essentially equal to the area median 8, 9 and the peripheral 10, 11 parts of a protector.

The location of the grooves 12, 13 of the faces 14 (figure 4, 5) lug of the median parts of the tread zigzag and combining it with the grooves 15 of the faces 14 of the lug peripheral parts, and the separation groove 16 in the longitudinal direction of the lug peripheral parts of the tread improves the self-cleaning and extends the functionality of the bus. At the same time face 14 is of runesacpe located at radius 17, 18 relative to the Equatorial plane. When the lug 11 of the peripheral part is separated by a longitudinal groove 19 of the hooks 20 of the sidewall.

Central cross country split diagonal grooves 21 (6), coinciding with the grooves 13 of the faces 14 of the lug middle parts. While the middle part has a lug, separated by a groove from the peripheral lugs 10, 11.

Each of the lugs separated by additional grooves 22, 23 (7), oriented in the radial direction 17, 18 and/or the direction perpendicular to it.

Separating the lugs of the Central running of the groove 23 (Fig) enters the membrane between the middle lug, and peripheral side portions of the tread.

Coordination of the direction of rotation of the tire with the direction of the grooves made on the said radii increases traction on non-cohesive soils and contributes to fluctuations in water surface to do this on the side there is a sign 24 (Fig.9) direction of rotation.

Tire on the surfaces of various capacities operates as follows.

At movement on a solid support surface pressure 1 maximum, and the deflection is small, therefore, in contact with the surface of the Central portion of the treadmill, the coefficient of saturation of the tread which is more, che is peripheral. This reduces the rolling resistance, and the Central 5 and parallel longitudinal grooves 6, 7 perform a stabilizing function, simultaneously, through the grooves 13, 15 is diverted water from under the footprint that promotes better grip and prevents aquaplaning.

Following the reduction of the bearing capacity of soil introduction mover increases, it is recommended to reduce the tire pressure to increase the contact patch with the surface. Consequently, the involved peripheral 12, 13 of the tread. Additionally sparse grooves 22, 23 drawing them helps to increase traction and self-cleaning. To exit out of a rut and improve manageability are U-shaped hooks 20 of the side walls.

The coordination of the direction of rotation 24 with the direction of the tread pattern contributes to fluctuations in water-saturated surfaces.

1. The tire-wheel all-terrain vehicle is equipped with a frame containing shell, the thickness of which is maintained essentially constant, characterized in that it is equipped with Central running part, the thickness of the shell is 0,007-0,030 height profile tires.

2. The tire according to claim 1, characterized in that the Central track portion divided by a longitudinal groove, parallel to which the grooves between the lugs of the tread Sredinnyi parts.

3. The tire according to claim 2, characterized in that the area of the outer surface of the lug, located directly on the separating grooves essentially equal to the area of the middle and peripheral parts of the protector.

4. The tire according to claim 3, characterized in that the groove faces of the lugs of the median parts of the tread are arranged zigzag and combined with the grooved faces of the lugs of the peripheral parts.

5. The tire according to claim 4, characterized in that the lugs of the peripheral parts of the tread separated by a groove in the longitudinal direction.

6. The tire according to claim 5, characterized in that the faces of the lugs are located radially relative to the Equatorial plane.

7. The tire according to claim 6, characterized in that the lug peripheral portion separated by a longitudinal groove from hooks sides.

8. Tire according to any one of claims 4 to 7, characterized in that the Central cross-country split diagonal grooves coinciding with the grooved faces of the lugs of the middle parts.

9. The tire of claim 8, wherein the middle part has a lug, separated by a groove from a peripheral lug.

10. The tire according to claim 9, characterized in that each of the lugs divided dopolnitelnye grooves.

11. The tire of claim 10, wherein separating the lugs of the Central running of the groove goes on the shell between GRU is Rosaceae median, peripheral and lateral parts of the protector.

12. Tire according to any one of claims 7, 9-11, characterized in that on the side there is a sign of the direction of rotation coincident with the direction of the grooves made on the said radii.



 

Same patents:

FIELD: transport.

SUBSTANCE: invention relates to automotive tire to be used for travelling over ice and snow. Running surface (10) of non-studded snow tire is positioned so that side grooves (3A, 3B, 3C, 3D, 5) running in axial direction in each of grain blocks (2A, 2B, 2C, 2D) the axial length of side grooves (3A, 3B, 3C, 3D) disclosing in at least one of straight longitudinal grooves (1, 1A, 1B) running adjacent to grain block where side groove is contained is called groove edge element. Ratio of total length of groove edge elements on inner running surface IN to total length of groove edge elements on outer running surface OUT is equal to 1.03-1.3. Ratio of negative outer running surface coefficient OUT to negative inner running surface coefficient IN is equal to 0.85-1.0.

EFFECT: higher grip, as well as driving stability during travelling over ice and snow.

2 cl, 1 dwg

FIELD: machine building.

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EFFECT: higher safety, simplified design, production assembly and disassembly.

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Non-spiked tire // 2440249

FIELD: transport.

SUBSTANCE: invention relates to non-spiked tire for low-rigidity tread. Distance A is measured from section wherein tire ring is divided to position whereat maximum tire width is formed in cross section of tire 10 crossing central axial line whereon pressurised tire is fitted on rim 11. Distance B is measured from position whereat tire ring is divided along tire radial direction. Side profile factor defined as A:B ratio in the state whereat tire is mounted on vehicle varies from 0.52 to 0.55 in direction of semi-segment width on outer side in mounting on vehicle, and from 0.45 to 0.50 in direction of semi-segment width on inner side in mounting on vehicle, or from 0.5 to 0.35 in direction of semi-segment width on outer side in mounting on vehicle, and from 0.45 to 0.48 in direction of semi-segment width on inner side in mounting on vehicle.

EFFECT: better stability in straight run.

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FIELD: transport.

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EFFECT: higher efficiency of antipuncture protection.

16 cl, 4 dwg

FIELD: chemistry.

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EFFECT: disclosed composition has excellent processability during production and heat ageing resistance, high storage modulus and loss tangent.

10 cl, 6 tbl, 8 ex

FIELD: transport.

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FIELD: transport.

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3 cl, 3 dwg

FIELD: machine building.

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EFFECT: simplified design of clutch and facilitation of block disassembly.

2 dwg

FIELD: transport.

SUBSTANCE: invention relates to aircraft engineering and automotive industry. Proposed method and device uses mechanical sealing to eliminate tire puncture by automatic pressing of sealant to tire inner surface originated in tire puncture and pressure drop thanks to extra smaller-diametre inner tube in rubber tubeless tire. Said inner tube is provided with sealing envelope with corrugated surface along its radius to compensate for tube size in working position in tire puncture. Said envelope is made from elastic porous material, for example, silicon, or latex, or foamed rubber, or foamed polyethylene. Said envelope is designed to provide, at normal tire inner pressure, a clearance, and pressing said envelope at pressure drop to tire inner surface at tube inner pressure. Said envelope is provided with protective layer from Kevlar or Teflon to protect inner tube from sharp articles.

EFFECT: tire serviceability after puncture at reduced operating pressure.

2 cl, 1 dwg

Air tire // 2411136

FIELD: transport.

SUBSTANCE: invention relates to air tires, particularly, to air tires for buses and trucks. Proposed air tire comprises two beads arranged in opposition along tire width, carcass arranged between two said beads, and inner lining made on carcass inner side along tire radial direction. Inner tire features modulus higher along tire width than that long tire circumference.

EFFECT: increased life and reliability.

3 cl, 2 dwg, 2 tbl

FIELD: transportation.

SUBSTANCE: invention relates to pneumatic tyres, mainly for the pneumatic tyre wheeled vehicles operating in conditions of impassability, on deformable, viscous and/or loose soil, designed to ensure normal traction of agricultural tractor drive wheel tracks with road. The pneumatic tyre track protector contains tangentially curved grousers, the distance between the said grousers equals the width of the grouser proper.

EFFECT: goof vehicle stability on an inclined surface, higher efficiency and safety.

2 dwg

Pneumatic tire // 2466032

FIELD: transport.

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

Pneumatic tire // 2464180

FIELD: transport.

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

Pneumatic tire // 2462367

FIELD: transport.

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

Pneumatic tire // 2459713

FIELD: transport.

SUBSTANCE: invention relates to automotive tire with tread for winter operating conditions. Set of GB blocks is arranged on, at least, part of tire tread 1 with blocks 3 located nearby each other. Said blocks are formed by grooves 2 and separated one from another. Symbol P (mm) designates characteristic spacing of blocks in said group GB. Symbol W (mm) designated width of set of blocks. Symbol a (pcs) designates quantity of blocks 3 in design area Z of aforesaid group GB. Design area is demarcated by characteristic length of spacing P and width W while symbol N (%) designates negative factor in area Z. Density S of blocks per unit of actual area of contact spot of said group is defined by the formula S=a/{P×W×(1-N/100)} and set in the range of at least 0.003 (pc./mm2) to not over 0.04 (pc./mm2).

EFFECT: higher efficiency on ice.

6 cl, 18 dwg, 4 tbl

Pneumatic tire // 2457956

FIELD: transport.

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

FIELD: transport.

SUBSTANCE: invention relates to automotive tire to be used for travelling over ice and snow. Running surface (10) of non-studded snow tire is positioned so that side grooves (3A, 3B, 3C, 3D, 5) running in axial direction in each of grain blocks (2A, 2B, 2C, 2D) the axial length of side grooves (3A, 3B, 3C, 3D) disclosing in at least one of straight longitudinal grooves (1, 1A, 1B) running adjacent to grain block where side groove is contained is called groove edge element. Ratio of total length of groove edge elements on inner running surface IN to total length of groove edge elements on outer running surface OUT is equal to 1.03-1.3. Ratio of negative outer running surface coefficient OUT to negative inner running surface coefficient IN is equal to 0.85-1.0.

EFFECT: higher grip, as well as driving stability during travelling over ice and snow.

2 cl, 1 dwg

Pneumatic tire // 2454332

FIELD: transport.

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

Pneumatic tire // 2443572

FIELD: transport.

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

Non-studded tire // 2441765

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

Non-studded tire // 2441764

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

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