Pneumatic tire

FIELD: transport.

SUBSTANCE: invention relates to tread pattern of motor tire. Pneumatic tire includes tread (2) with central longitudinal groove (3a), shoulder longitudinal grooves (3b) passing at both sides of central longitudinal groove (3a) and intermediate areas (4a) of ground coupling separated by central longitudinal groove (3a) shoulder longitudinal grooves (3b). Each of areas (4a) of ground coupling includes narrow grooves (5) passing from position spaced to inner side in axial direction of tire from shoulder longitudinal groove (3b); intermediate tilted grooves (6) each one of which goes tilted from narrow groove (5) towards central longitudinal groove (3a) and terminates without connection with central longitudinal groove (3a), and connecting grooves (7), interconnecting intermediate tilted grooves (7) adjacent in longitudinal direction of tire. Connecting grooves (7) are tilted relative to tire longitudinal direction in the same direction as intermediate tilted grooves (6) and at less angle than intermediate tilted grooves (6).

EFFECT: better drainage and antinoise characteristics of tire.

5 cl, 8 dwg, 1 tbl

 

The technical field

The present invention relates to a pneumatic tire capable of meeting the requirements at a high level as noise characteristics, and stability of driving while maintaining the characteristics of the drainage and comfort of driving.

The level of technology

Mainly to improve the drainage characteristics of the tires to increase the capacity of the longitudinal grooves, passing in the longitudinal direction of the tyre, located on the surface of the tread. However, there is a problem in that such longitudinal grooves during movement of the vehicle may experience the resonance of the air channel and noise characteristics deteriorate. Moreover, there is a problem in that the rigidity of the tread is reduced, and the driving stability is deteriorating.

The present applicant has already proposed a pneumatic tire in which the combination of longitudinal grooves, a straight line passing in the longitudinal direction of the bus, and inclined grooves inclined relative to the longitudinal direction of the tire, thereby suppressing the deterioration of driving stability and noise characteristics, thus improving drainage features (see the following patent document 1).

Patent document 1: published patent application of Japan No. 2004-262312.

Objectives of the invention

Characteristics of drainage effectiveness is up to some extent in the above technical solution. However, from the point of view of the silence in the car and trends provide high capacity automotive engine lately need for additional improvement of the noise characteristics and stability of driving.

The present invention was developed taking into account these circumstances and based on the technical reception at which the inclined groove and a narrow longitudinal groove, which have a special shape, combine the intermediate contact area with the ground, which is limited to the Central longitudinal groove, passing in the longitudinal direction of the bus near the equator of the tire, and the shoulder longitudinal groove, passing in the longitudinal direction of the tyre with the axially outer side of the Central longitudinal groove. The main purpose of the present invention is to provide a pneumatic tire capable of meeting the requirements at a high level as noise characteristics, and stability of driving, while maintaining the characteristics of the drainage and comfort of driving.

Means of solving problems inventions

In accordance with the present invention a pneumatic tyre with the prescribed direction of rotation includes protector, equipped with:

one or two Central longitudinal grooves, passing in the longitudinal direction of the tire on the tire equator or on each side of aquat the RA bus;

shoulder longitudinal grooves, each of which runs in the longitudinal direction of the tire on each side of the specified Central longitudinal grooves and

intermediate areas of contact with the ground, each of which is limited to a specified Central longitudinal groove and the shoulder longitudinal groove

where each specified intermediate contact area with the ground is supplied:

a narrow groove, passing linearly and continuously in the longitudinal direction of the tire in position axially remote inside 3-6% of the width of contact of the tread with the ground from the shoulder longitudinal groove;

intermediate inclined grooves, each of which passes from the said narrow grooves in the direction to the said Central longitudinal groove tilted forward in the direction of rotation of the tire, and its axially inner end ends without a connection to the specified Central longitudinal groove, and

the connecting grooves, each of which is located axially within the specified narrow grooves and is held so that connects adjacent intermediate slant grooves in the longitudinal direction of the bus,

each of these connecting grooves has:

the front end in the direction of rotation, coupled with the specified inner end of the intermediate slant groove, and

the rear end in the direction of rotation, connected at a distance, remote axially outward at 3-10 mm from the inner end of the intermediate slant grooves so that each of the connecting groove is inclined in the same direction as specified intermediate inclined groove with respect to the longitudinal direction of the tire at an angle less than the angle of inclination of the intermediate longitudinal grooves.

Technical effects

In the pneumatic tire according to the present invention, the protector includes an intermediate contact area with the ground, limited Central longitudinal groove and the shoulder longitudinal groove, passing in the longitudinal direction. The intermediate contact area with the ground is provided with a narrow groove, passing linearly and continuously in the longitudinal direction of the tire at the position remote from the shoulder longitudinal groove axially inside of the tire at a distance of from 3 to 6% of the width of contact of the tread with the ground. Narrow groove serves as longitudinal grooves to loosen the rigidity of the intermediate contact area with the ground. Also narrow groove can prevent the deterioration of the comfort of driving and improve drainage. A narrow groove can effectively remove the water, located between the intermediate contact area with the ground and the road surface.

Intermediate of the region of ground contact includes an intermediate inclined grooves, tilted and passing from the narrow grooves forward in the direction of rotation of the tire and having an inner end terminating without connection to the Central longitudinal groove. As an intermediate inclined grooves pass through the intermediate contact area with the ground, which has a high contact pressure on the soil, water, situated between the intermediate contact area with the ground and the road surface can be effectively allocated to the axially outside of the tire, as the rotation of the tire. Thus, the characteristics of the drainage can be further improved.

The intermediate contact area with the ground provided with connecting grooves, each of which is located axially inside of the tire relatively narrow groove and connects the adjacent intermediate slant grooves in the longitudinal direction of the tire. Such a connecting groove is useful for weakening the rigidity of the intermediate contact area with the soil and improve the comfort of driving. The front end of the connecting grooves in the direction of rotation is connected with the inner end of the intermediate slant groove. On the other hand, the rear end of the connecting grooves in the direction of rotation is connected at the position remote from the inner end of the intermediate slant groove at a small distance from 3 to 10 mm axially outward of the tire. If e is ω connecting grooves inclined in the same direction, that and the intermediate inclined groove with respect to the longitudinal direction of the bus, and inclined at a smaller angle than the angle of inclination of the intermediate slant grooves. This combination of connecting grooves and an intermediate inclined grooves improves the characteristics of the drainage in the intermediate region of the ground contact side of the equator of the tire, improves the rigidity of the side of the narrow groove and the driving stability.

The air passing through the connecting grooves during rotation of the tire takes place not only along the longitudinal direction of the tire, and part of the air is successively distributed in the intermediate slant groove. Thus, the occurrence of resonance of the air channel, caused by the passage of air through the connecting groove is suppressed and prevented the deterioration of noise characteristics. The air is distributed and held in the intermediate slant groove is diverted into a narrow groove, passing in the longitudinal direction of the tire, the air flow in a narrow groove is changed, and the occurrence of resonance of the air channel can be suppressed.

Thanks to the pneumatic tire of the present invention can simultaneously achieve a high level of drainage characteristics, noise characteristics and comfort of driving.

Brief description of drawings

Figure 1 presents deployed the th tread of a pneumatic tire according to one of embodiments of the present invention.

Figure 2 provides a partial enlarged view of the left half of the specified tread.

Figure 3 presents the cross-section of the grooves of the tread pattern, taken along the line A1-A1.

4 shows the enlarged view of the connecting groove and the intermediate slant groove.

Figure 5 presents the cross section of the protrusion surface of the wall, taken along the line A2-A2.

Figure 6 presents a detailed view of the protector of comparative example 1.

Figure 7 presents a detailed view of the protector of comparative example 2.

On Fig presents a detailed view of the protector of comparative example 3.

Description of designations

2. Protector

3A. A Central longitudinal groove

3b. The shoulder longitudinal groove

4A. The intermediate contact area with the ground

5. Narrow groove

6. The intermediate slant groove

7. The connecting groove

9A. Intermediate unit

11. Shoulder lateral groove

14. Intermediate auxiliary oblique groove

The best option of carrying out the invention

The embodiment of the present invention is described hereinafter with reference to the drawings.

Figure 1 shows the expanded view of the tread of a pneumatic tire (the tire is not fully shown) of the present invention, figure 2 provides a partial enlarged view of the left half of this tread and figure 3 pre is represented by the cross-section, taken along the line A1-A1 in figure 1.

Pneumatic tire according to the present embodiment is a tire for passenger car and has a so-called directional pattern, which identifies the intended direction of rotation F, when the tire is installed on the vehicle. In the case of a directional pattern according to the present embodiment, the right side of the figure and the left side of the drawing essentially linearly symmetric about the equator With tires. Here, the expression "essentially linearly symmetric" should be understood so that it includes the embodiment in which the left and right sides of the figure are the differences caused by changing the pitch or phase shift in the longitudinal direction of the tire.

Pneumatic tire according to the present embodiment contains the protector 2, provided one of the Central longitudinal groove 3A, continuously passing in the longitudinal direction of the tire at the equator With tires, and a pair of shoulder longitudinal groove 3b and 3b, each of which runs continuously in the longitudinal direction of the tire on both sides of the Central longitudinal groove 3A. Thus, the protector 2 is formed with four areas of contact with the ground, including a pair of intermediate regions 4A contact with the ground, limited Central longitudinal groove 3A and the shoulder longitudinal groove 3b, and a pair of shoulder regions 4b of the ground contact between plait the eve of the longitudinal groove 3b and the edge of The contact of the tread with the ground.

A Central longitudinal groove 3A is a straight groove, passing continuously in the longitudinal direction of the tire. Such rectilinear groove has a small resistance to drainage and demonstrates high performance drainage in straight-line motion on a wet road surface. The width W1 of the Central longitudinal groove 3A is not limited in a particular way, but if it is too small, satisfactory drainage characteristics cannot be obtained, and if the width W1 of the groove is too large, noise characteristics may deteriorate. For these reasons, the width W1 of the Central longitudinal groove 3A is preferably not less than 2.5% of the total width TW of contact of the tread with the ground, more preferably not less than 3.0% and preferably not more than 5.5% and, more preferably, not more than 5.0%. The width of the grooves is a width of an opening on the outer surface of the tread 2, measured at a right angle relative to the longitudinal direction of the groove.

Here, the width TW of contact of the tread with the ground" represents the axial distance between Those edges, The contact of the tread with the ground, measured in the conditions under which the tire is mounted on a standard rim and inflated to a normal internal pressure, and the tire is loaded with a standard load.

"Standard rim" is from the battle of the wheel rim, officially established for bus standards organizations, i.e. the "standard rim" defined in the system JATMA (Japan Association of manufacturers of automotive tires), "measuring wheel" in the ETRTO (European technical organization rims and tires) and "design rim"in the system TRA (Association for the rims and tyres North America) or similar

The "normal internal pressure" is the pressure of the air, officially set for each bus standards organizations, i.e. the "maximum air pressure" in the system JATMA, the "inflation pressure" in the system ETRTO and the maximum pressure specified in the table Within loads of tyres at different pressures of the cold pumping system TRA or the like, However, in the case of passenger cars in normal use pressure 180 kPa.

"Standard load" is a load bus, officially set for each bus standards organizations, i.e. the "maximum load capacity" in the system JATMA, the "load capacity" in the system ETRTO and the maximum value presented in the above table, in the system TRA or the like, However, in the case of tires for passenger cars 88% of the maximum load is used as a standard load.

Preferably the Central longitudinal groove 3A provided in the position in which RAS is-being P1 from the edge of The contact of the tread with the ground to the center line of the Central longitudinal groove 3A in the axial direction of the tire is 50% of the width TW of contact of the tread with the ground. The characteristics of the drainage on the equator With tires improve. However, two Central longitudinal grooves 3A and 3A (not shown) may be provided on both sides of the equator With tires. In this case, preferably the above-mentioned distance D1 is approximately 42 to 46% of the total width TW of contact of the tread with the ground. If the distance P1 exceeds 46% of the total width TW of contact of the tread with the ground, the stiffness of the contact area with the ground between the Central longitudinal groove 3A can get worse, and if the distance D1 is less than 42%, may deteriorate the effect of the drainage near the equator With tires.

The shoulder longitudinal groove 3b are also rectilinear grooves passing rectilinearly in the longitudinal direction of the tire, like a Central longitudinal groove 3A so that you can achieve high performance drainage during rectilinear motion. The width W2 of the shoulder longitudinal groove 3b is not limited in a particular way, but to improve the drainage characteristics and noise characteristics, preferably, the width W2 of the groove is not less than 3.5% of the total width TW of contact of the tread with the ground, more preferably not less than 4.0% and, preferably, not more than 6.5% and, more preferably, not more than 6.0%. Tire with high contact pressure on the ground in the shoulder region due to the influence of the profile or under the different characteristics of the tread 2, the width W2 of the shoulder longitudinal groove 3b can be set more than the width W1 of the Central longitudinal groove 3A, to improve drainage characteristics.

To improve the drainage characteristics and noise characteristics with excellent balance, the depths D1 and D2 of the Central longitudinal groove 3A and the shoulder longitudinal groove 3b (shown in Figure 3) should preferably be not less than 6 mm, more preferably not less than 7 mm and, preferably, not more than 10 mm and, more preferably, not more than 9 mm

The shoulder longitudinal groove 3b is preferably provided in the position in which the axial distance P2 between the Central line of the shoulder longitudinal groove 3b and the edge of The contact of the tread with the ground is 17 to 25% of the width TW of contact of the tread with the ground. Thus, the surface of the ground contact of the tread 2 is essentially equally divided into four parts Central longitudinal groove 3A and the shoulder longitudinal groove 3b, the balance of rigidity of the tread 2 remains excellent, and the driving stability can be improved.

As shown in Figure 3, the angular area between the wall 3bw shoulder longitudinal groove 3b and the surface 2A of the ground contact of the tread 2 is preferably cut with the formation of the bevel 17. In particular, the width of the axially-outer bevel 17 tyres (i.e. the bevel from the shoulder region 4b of contact with the ground) establish more. This is sportsouth to prevent stress concentration at the shoulder region 4b of contact with the ground during movement of high velocity, and to suppress uneven wear.

The staging area 4A of the ground contact provided with a narrow groove 5, passing in the longitudinal direction of the bus near the shoulder longitudinal groove 3b, the intermediate inclined grooves 6, tilted and passing from the narrow grooves 5 in the direction towards the Central longitudinal groove 3A, the connecting grooves 7, spaced axially from the inner side from the narrow grooves 5 and connecting adjacent intermediate slant grooves 6 and 6 in the longitudinal direction of the tire, and an intermediate auxiliary oblique grooves 14 provided between adjacent intermediate inclined grooves 6 and 6 in the longitudinal direction of the tire. These grooves 5, 6, 7, and 14 intermediate region 4A in contact with the ground is divided into an inner edge 8, continuously passing in the longitudinal direction of the tire between the connecting grooves 7 and the Central longitudinal groove 3A, the outer edge 10, continuously passing in the longitudinal direction of the tire between the shoulder longitudinal groove 35b and the narrow groove 5, and the number 9 intermediate blocks secured between the inner edge 8 and the outer edge 10, where the intermediate blocks 9A, limited intermediate inclined grooves 6 and 6, are arranged in the longitudinal direction of the tire.

The narrow groove 5 linearly and continuously runs in the longitudinal direction of the bus state is, remote from the shoulder longitudinal groove 3b inside in the axial direction of the tire at a distance K1 (shown in figure 1) from 3 to 6% of the total width TW of contact of the tread with the ground. This passing in the longitudinal direction of the narrow groove 5 weakens the rigidity of the intermediate region 4A of the ground contact and enhances driving comfort. The narrow groove 5 also serves as a groove longitudinal direction with excellent drainage characteristics and effectively diverts water between the staging area 4A of the ground contact and the road surface. Moreover, since the outer edge 10, is formed between the narrow groove 5 and the shoulder longitudinal groove 3b, runs continuously in the longitudinal direction of the tire, the narrow groove 5 is useful for improving the stability of the rectilinear motion when moving with high velocities. The outer edge 10 may be appropriately provided with notches 18, regulatory rigidity.

Here, if the distance K1 (i.e. the width of the external ribs 10) becomes less than 3% of the width TW of contact of the tread with the ground, the transverse rigidity of the outer ribs 10 much worse, and this rubber edges may crack or be subjected to uneven wear. On the other hand, if the distance K1 exceeds 6% of the total width TW of contact of the tread with the ground, the width of the intermediate blocks 9A in Axia enom direction of the tire becomes small, and the driving stability may deteriorate. From this point of view, the distance K1 is preferably not less than 4% of the total width TW of contact of the tread with the ground and, more preferably, not more than 5%.

Moreover, if the width W3 and the depth D3 of the narrow grooves 5 are too small, the driving comfort and drainage characteristics may deteriorate, and if they are too large, the surface of the ground contact and the rigidity of the intermediate region 4A in contact with the ground is reduced, and adhesion characteristics on a dry road surface can deteriorate. From this point of view, the width W3 of the narrow grooves is preferably not less than 0.5% of the total width TW of contact of the tread with the ground, more preferably not less than 1.0% and preferably not more than 2.5% and, more preferably, not more than 2.0%. Similarly, the depth D3 (shown in Figure 3) narrow groove 5 is preferably not less than 55% of the depth D2 of the shoulder longitudinal groove 3b, more preferably at least 60% and preferably not more than 75% and, more preferably, not more than 70%.

As shown in figure 2 on an enlarged scale, of the intermediate slant groove 6 extending from the narrow grooves 5 in the direction towards the Central longitudinal groove 3A tilted forward in the direction of rotation. The intermediate slant groove 6 has an inner end 6t in the axial direction of the tire. Axial-DNAs is Rennie end 6t ends, not connecting with the Central longitudinal groove 3A. Since the intermediate slant groove 6 pass through an intermediate region 4A of the ground contact having a high contact pressure on the ground, the intermediate slant groove 6 effectively drains located between the staging area 4A of the ground contact and the road surface in the shoulder longitudinal groove 3b with the axially outer side, as the rotation of the tire. Thus, this construction can improve the drainage characteristics of the tire.

Also, since the axially inner end 6t of the intermediate slant groove 6 is not connected with a Central longitudinal groove 3A, it is possible to prevent the deterioration of the rigidity of the axially inner side of the intermediate region 4A of the ground contact and to ensure the driving stability. However, if the distance S3 between the axially inner end 6t of the intermediate longitudinal grooves 6 and the Central longitudinal groove is too large, the characteristics of the drainage side of the equator With tyres can deteriorate. If the above distance K3 is too small, the driving stability on a dry road surface may deteriorate. From this point of view, the distance K3 is preferably not less than 3 mm, more preferably not less than 4 mm and preferably not more than 6 mm and, more preferably, not more than 5 mm. P is edocfile width W4 of the intermediate slant groove 6 is from 1 to 3% of the total width TW of contact of the tread with the ground, and the depth D4 (shown in Figure 3) is from 70 to 85% of the depth D2 of the shoulder longitudinal groove 3b.

In this embodiment the intermediate slant groove 6 are curved and extending from the narrow grooves 5 to the inner end of 6t with decreasing angle θ1 from an acute angle relative to the longitudinal direction of the tire, but the intermediate slant groove 6 can undergo without changing this angle. To provide transverse rigidity of the intermediate blocks 9A and sufficient to provide the desired operating characteristics, the angle θ1 of the intermediate slant groove 6 with respect to the longitudinal direction of the tire is preferably not less than 35 degrees, more preferably not less than 40 degrees, preferably not more than 55 degrees and, more preferably, not more than 50 degrees. The angle of the groove represents approximately the angle of the Central line of the groove relative to the longitudinal direction of the bus, however, if the Central line of the groove is curved, the angle of the groove is defined as the angle formed between the tangent to the centre line relative to the longitudinal direction of the tire.

Preferably not less than 20 and not more than 30 intermediate longitudinal grooves 6 are relatively rare around the circumference of the tire in each intermediate region 4A in contact with the ground. Thus, promezhutochnya 9A become more elongated in the longitudinal direction of the tire, which is useful to ensure excellent stability of rectilinear motion and resistance to wear. If the number of intermediate slant groove 6 is less than 20, the drainage characteristics may deteriorate, and if this amount is more than 30, the longitudinal rigidity of the intermediate blocks 9A may deteriorate, and adhesion characteristics on dry roads also deteriorate.

The connecting grooves 7 are axially over the inside of the tire than the narrow groove 5, and connect the adjacent intermediate slant groove 6 in the longitudinal direction of the tire. These connecting grooves 7 is useful for weakening the rigidity of the intermediate region 4A soil contact and improve comfort driving. The front end 7a of the connecting grooves 7 in the direction of rotation is connected with the axially inner end 6t of the intermediate slant groove 6. On the other hand, the rear end 7b in the direction of rotation is connected with the intermediate slant groove 6 at a location remote from the inner end 6t of the axially outside of the tire for a short distance, K4 from 3 to 10 mm, While the connecting groove 7 is inclined in the same direction as the intermediate slant groove 6 with respect to the longitudinal direction of the tire at a smaller angle θ2 than the angle of inclination of the intermediate slant groove 6. In accordance with this combined with einternal grooves 7 and the intermediate slant groove 6 features further improve the drainage by means of a connecting grooves 7, inclined relative to the longitudinal direction of the tire at a slight angle θ2, of the equator With tires that have poor drainage. However, from the shoulder longitudinal groove 3b, where there is a large shear force while the vehicle is in motion on the rotation of the intermediate slant groove 6, which are held under a relatively large angle θ1, improve the lateral rigidity of the intermediate region 4A in contact with the ground.

The connecting grooves 7 formed continuously in the longitudinal direction of the tire through the intermediate slant groove 6. Thus, the characteristics of the drainage near the equator With tires can be significantly improved. The air that passes through the connecting grooves 7 in the course of driving on dry road surface, takes place not only along the longitudinal direction of the tire, and part of the air is distributed in the intermediate slant groove 6 through the rear end 7b. Thus suppress the occurrence of resonance of the air channel, caused by the passage of air through the connecting grooves 7, and prevent the deterioration of noise characteristics. The air is distributed and held in the intermediate slant groove 6, is given in a narrow canal, passing in the longitudinal direction of the tire, and the air flow in the narrow groove 5 is changed and the occurrence of resonance of the air channel mo is et to be suppressed.

Here, if the distance is less than 3 mm K4, the effect of the distribution of air passing through the connecting grooves 7, deteriorating, and noise characteristics are not sufficiently improved. If the distance Q4 exceeds 10 mm, the angle θ2 of the connecting grooves 7 can be increased and the characteristics of the drainage insufficiently improved. From this point of view, the distance Q4 is preferably not less than 5 mm and not more than 8 mm, similarly, the angle 92 of the connecting grooves 7 with respect to the longitudinal direction of the tire is preferably not less than 1 degree and not less than 2 degrees. Preferably, the width W5 of the connecting grooves 7 is approximately 1 to 3% of the total width TW of contact of the tread with the ground, and the depth D5 of the grooves ranges from 70 to 80% of the depth D2 of the shoulder longitudinal groove 3b.

As shown in Figure 4 and 5, which presents a cross-section taken along the line A2-A2, the axially outer wall 7s of each of the connecting grooves 7 preferably provided with a protrusion 12. The protrusion 12 extends toward the center of the groove partially from the wall 7s of the groove and preferably has a length L4 of at least 10 mm in the longitudinal direction of the tire from the front end 7a. More specifically, the protrusion 12 in the present embodiment takes place in the direction of rotation beyond the top 9i intermediate block 9A, formed in the shape of an acute angle and the positioning with the first side of the ground contact according to the direction of rotation. The ledge 12 includes going on a cone surface 12s, which is inclined from the surface 2A of contact with the ground inside in the radial direction of the tire, and the protruding surface 12r of the wall, passing from going on a cone surface 12s to the bottom of the groove radially inward of the tire.

As shown in figure 4, such protrusions 12 to smoothly distribute the water from the road surface near the equator With tires sent the connecting grooves 7 to the intermediate inclined grooves 6, as shown by the arrow In, effectively drains the axially outside of the tire and improve the performance of the drainage. The tabs 12 are also effectively direct the air passing through the connecting grooves 7 in the intermediate slant groove 6, effectively changing the air in the narrow groove 5, additionally suppress the occurrence of resonance of the air channel. The tabs 12 also improve the rigidity near the tops 9i intermediate blocks 9A, where the intermediate slant groove 6 and the connecting grooves 7 intersect, thereby impairing the rigidity, and are useful to improve the stability of driving. For effective manifestation of such effects the width (f) of the protrusion 12 and the wall surface is preferably set to approximately 1 to 2 mm.

Like the outer edge 10 of the inner edge 8 improves the stability of the rectilinear motion when moving with great speed of the I. The inner edge 8 runs in the longitudinal direction of the tire so that its width K2 in the axial direction of the tire periodically increases and decreases due to the bevel of the connecting grooves 7. This inner edge 8 is useful for allocating frequency noise resulting from contact between the tyre and the road surface during movement.

Intermediate unit 9A has a length in the longitudinal direction of the tire is greater than its width in the axial direction of the tire. Each intermediate unit 9A equipped with multiple (two in this embodiment) of the auxiliary oblique grooves 14 essentially parallel to the intermediate inclined grooves 6. Intermediate auxiliary oblique grooves 14 are held to the front side in the direction of rotation, i.e. in the same direction as the direction of the intermediate slant groove 6, when approaching the connection groove 7. Intermediate auxiliary oblique grooves 14 end without connecting with connecting grooves 7. The intermediate unit 9A, which is stretched in the longitudinal direction, in the shape of the crest, and this can prevent the deterioration of characteristics of the drainage and wear characteristics.

If the axial distance between K5 connecting groove 7 and the axially inner end 14t of the auxiliary slant groove 14 becomes by small and is, the stiffness of this area is severely reduced, and tires are unevenly worn or exfoliate. On the contrary, if the distance K5 becomes large, the effects of improving the comfort of driving and resistance to wear and drainage characteristics may deteriorate. From this point of view, the distance K5 preferably set not less than 5 mm, more preferably not less than 6 mm and preferably not more than 10 mm and, more preferably, not more than 9 mm, Preferably a width W6 of the intermediate auxiliary slant groove 14 is from 1 to 13% of the total width TW of contact of the tread with the ground, and the depth D6 of the groove is approximately from 80 to 100% of the depth D4 of the intermediate slant groove. Intermediate unit 9A may be provided with a radial recess 19.

Shoulder lateral grooves 11 extending from the shoulder longitudinal groove 3b to the edge of The contact of the projector with the ground, are located in the shoulder region 4b of contact with the ground. Each of the shoulder lateral groove 11 is inclined in the same direction as the intermediate slant groove 6, and passes from the shoulder longitudinal groove 3b to the rear side in the direction of rotation. Shoulder lateral grooves 11 are held at least to the edge of The contact of the tread with the ground. Thus, the shoulder region 4b of the ground contact is formed as a series of blocks, where the shoulder BL the key 13 in the longitudinal direction of the tire. Shoulder region 4b of contact with the ground can direct the water and the air partially along the shoulder longitudinal groove 3 and can release them from the edge of The contact of the tread with the ground.

Turning the car even outside area of The edge contact of the tread with the ground tire comes into contact with the ground. Therefore, the axially outer end 11t of the shoulder longitudinal groove 11 preferably is located outside the edge of The contact of the tread with the ground. The characteristics of the drainage when driving in turn improve. If each end 11t of the shoulder longitudinal groove 11 provided in the same position in the axial direction of the tire, the frequency noise while driving on the turn overlap each other, and there can be a lot of noise pumping, etc. So to maintain hydrogeochemistry while driving on the turn and improve the noise characteristics provide many kinds, preferably three or more kinds of shoulder lateral grooves 11, with different positions of the outer ends of the 11t in the axial direction of the tire (in this embodiment, three kinds of shoulder lateral grooves 11A, 11B and 11C).

The width W7 and depth D7 of the shoulder lateral grooves 11 are not limited in a particular way, but preferably the width W7 of the grooves is not less than 0.5% of the total width TW of contact of the tread with the ground, more FAV is preferably, not less than 1.0% and preferably not more than 3.5% and, more preferably, not more than 3.0%. Similarly, the depth D7 (shown in Figure 3) shoulder lateral grooves 11 is preferably from about 70 to 90% of the depth D2 of the shoulder longitudinal groove 3b.

In the pneumatic tire according to the embodiment, the ratio of the areas of the tread 2 is preferably from 68 to 72%. If the ratio exceeds 72%, the area of the grooves is reduced, thus, do not reach sufficient performance enhancing drainage. If the ratio is less than 68%, driving stability may deteriorate. The ratio of the areas is the ratio of actual contact area with the ground to the total area (including square grooves) contact surface with the ground, provided a standard rim, normal internal pressure and a standard load.

Although particularly preferred embodiment of the present invention are described in detail, the invention is not limited to the represented embodiment, and the invention can be implemented with various modifications.

Examples

Radial tires for passenger cars with a size of 195/65R15 were made as prototypes with the technical characteristics shown in the table, and had the characteristics of the drainage, driving comfort and noise x the characteristics of each bus. The tires of the examples have a tread pattern provided on Fig As shown in Fig.6, in the tire of comparative example 1, the intermediate contact area with the ground is not provided with a narrow groove. In the tire of comparative example 2, the intermediate contact area with the ground is not provided with connecting grooves. In the tire of comparative example 3, both ends of the connecting grooves are connected with the axially inner ends of the intermediate slant grooves. In comparative example 2, the number of intermediate slant grooves arranged in the longitudinal direction of the tire is increased so that the ratio of the areas becomes the same as in the other examples.

General specifications were as follows:

The width TW of contact of the tread with the ground: 153 mm

Width (W1/TW) of the Central longitudinal grooves: 4%

The depth D1 of the Central longitudinal groove: 7,8 (mm)

Width (W2/TW) shoulder longitudinal grooves: 5%

The depth D2 of the shoulder longitudinal groove: 7,8 (mm)

The testing methods were as follows:

Drainage characteristics

Front-wheel drive passenger car with a front mounted engine displacement of 2000 cm3installed on all four wheels of the test tires (tire pressure 200 kPa, the size of the rim 6,0JJ×15) was tested on an asphalt road surface with a radius of 100 m, equipped with a pool of water depth is Oh 5 mm and a length of 20 m, and measured lateral acceleration (lateral G) on the front wheels during movement in a puddle of water, gradually increasing the speed of entry into a puddle of water, to obtain the mean lateral acceleration in the speed range from 50 to 80 km/h (test lateral aquaplaning). The results are presented in the form of an index based on comparative example 1 taken as 100; the higher the score, the better the results.

The driving stability

The above test vehicle was tested on a dry road surface along the route of testing and driver's test pilot assessed the driving stability on the basis of response when driving on the turn, stiffness, grip, etc. the results of the tests are represented as points on the basis of comparative example 1 taken as 100. The higher the score, the better the performance.

Driving comfort

Like the above tests were performed testing on the basis of the senses of the driver in relation to the impression of rigidity, tremors and swinging stepped on a dry asphalt road surface, the cobblestone floor and on the road, sprinkled with coarse gravel. The test results are represented as points on the basis of comparative example 1 taken as 100. The higher the score, the better driving comfort.

Noise characteristics

When testing the noise characteristics of the above car was tested on a smooth asphalt road surface at a speed of 60 km/h and measured total noise level dB(a) in the vehicle in a fixed location, near the ear of the driver inside the car. The results are presented in the form of an index based on comparative example 1 taken as 100. The higher the score, the better the results.

The test results confirm that the pneumatic tires according to the examples according to the invention retains the characteristics of the drainage and driving comfort, and noise characteristics and the driving stability is significantly improved.

td align="center"> 6,1
EUR. app.1EUR. PREUR. PRApp.1PRPRPRPR
The tread pattern67Fig11111
The ratio of total area (%)7070707070707070
Position (P1/TW) of the Central longitudinal groove5050505050505050
Position (P2/TW) of the shoulder longitudinal groove2121212121212121
Narrow grooveno
Distance (K1/TW) between the narrow groove and the shoulder longitudinal groove (%)- the 4.7the 4.7the 4.7the 4.7the 4.7the 4.7the 4.7
The width (W3/TW) narrow grooves-1,11,11,11,11,13,01,1
The depth D3 of the narrow groove-5,05,05,05,05,05,05,0
The width of the intermediate slant groove (W4/TW)-2,22,22,21,82,22,22,2
The depth D4 of the intermediate slant groove (mm)-6,16,16,16,16,16,1
The angle θ1 of the intermediate slant groove (degrees)4646464646464646
The number of intermediate slant grooves in the longitudinal direction2630262630262626
The connecting grooveno
Distance K5 (mm)7,9-7,97,97,97,97,97,9
The distance K3 (mm) 4,34,34,34,34,34,34,32,0
Distance K4 (mm)5,1--5,15,15,15,15,1
Width (W5/TW) of the connecting grooves (%)1,9-1,91,91,91,91,91,9
The depth D5 of the connecting grooves (mm)the 5.7-the 5.7the 5.7the 5.7the 5.7the 5.7the 5.7
The angle θ2 (degrees)1,7-01,71,71,7 1,71,7
The ledge wall grooves
The length L4 of the projection wall of the groove (mm)24,924,924,924,924,924,924,924,9
Width "f" hanging wall of the groove (mm)1,91,91,91,91,91,91,91,9
Auxiliary oblique groove
Width (W5/TW) Prohm is filling auxiliary slant grooves (%) 2,02,02,02,01,62,02,02,0
The depth D7 of the intermediate auxiliary slant grooves (mm)5,95,95,95,95,95,95,95,9
The number of intermediate auxiliary oblique grooves on one intermediate unit22222222
The number of species of the shoulder lateral grooves33333333
Width (W7/TW) shoulder lateral grooves (%)2,2 2,22,22,22,22,22,22,2
The depth D6 of the shoulder lateral grooves (mm)6,26,26,26,26,26,26,26,2
Characteristics of the drainage (figure)10095989898979998
The driving stability (point)10095100105981009898
The comfort of driving (point)10095100103105103 100103
Noise characteristics (metric)100105102103103103102103

1. Pneumatic tyre with the prescribed direction of rotation, comprising protector, equipped with:
one or two Central longitudinal grooves, passing in the longitudinal direction of the tire on the tire equator or on each side of the tire equator;
shoulder longitudinal grooves, each of which runs in the longitudinal direction of the tire on each side of the specified Central longitudinal grooves, and
intermediate areas of contact with the ground, each of which is limited to a specified Central longitudinal groove and the shoulder longitudinal groove
where each specified intermediate contact area with the ground is equipped with:
a narrow groove, passing linearly and continuously in the longitudinal direction of the tire in position axially remote inside 3-6% of the width of contact of the tread with the ground from the shoulder longitudinal groove;
intermediate inclined grooves, each of which passes from the said narrow grooves in the direction of the criminal code which marks the Central longitudinal groove tilted forward in the direction of rotation of the tire, with its axially inner end ends without a connection to the specified Central longitudinal groove, and
the connecting grooves, each of which is located axially within the specified narrow grooves and is held so that connects adjacent intermediate slant grooves in the longitudinal direction of the tire,
each of these connecting grooves has:
the front end in the direction of rotation, coupled with the specified inner end of the intermediate slant groove, and
the rear end in the direction of rotation, connected at a distance, remote axially outward at 3-10 mm from the inner end of the intermediate slant grooves so that each of the connecting groove is inclined in the same direction as specified intermediate inclined groove with respect to the longitudinal direction of the tire at an angle less than the angle of inclination of the intermediate longitudinal grooves.

2. Pneumatic tire according to claim 1, in which the intermediate region of the ground contact includes:
the outer edge, continuously passing in the longitudinal direction of the tire between the said shoulder longitudinal groove and the narrow groove;
the inner edge, continuously passing in the longitudinal direction of the bus connection between these grooves and the Central longitudinal groove, and
about eroticly row of blocks, in which the intermediate blocks, limited specified intermediate inclined grooves are arranged in the longitudinal direction of the tire.

3. Pneumatic tire according to claim 1, in which the mentioned intermediate contact area with the ground is provided between adjacent intermediate inclined grooves in the longitudinal direction of the tire, at least one intermediate auxiliary slant groove passing from the said narrow grooves in the direction to the said connecting groove tilted forward in the direction of rotation and ends without connecting with connecting groove.

4. Pneumatic tire according to claim 1, in which
the ledge wall, facing into the groove and having a length at least 10 mm in the longitudinal direction of the tire, is provided on the axially outer wall of the specified connection grooves from the specified front edge.

5. Pneumatic tire according to any one of claims 1 to 4, in which
specified protector includes a shoulder region of the ground contact between the said shoulder longitudinal groove and the edge of contact with the ground,
the shoulder region of the ground contact includes a shoulder transverse grooves, each of which passes from the said shoulder longitudinal groove to the specified edge of the ground contact specified in the longitudinal direction, and
shoulder lateral grooves is clucalc different types of shoulder lateral grooves, position the outer ends of which in the axial direction of the tire are different from each other.



 

Same patents:

Pneumatic tire // 2469872

FIELD: transport.

SUBSTANCE: pneumatic tire includes groove (1), outer main grooves (2) and transversal grooves (3), separating multiple tire checkers (5) located in central part of tread (C), and ribs (6) of tire shoulder (S) contain grooves of cleat (4). Transversal grooves (3) located at both sides of central main groove (1) in transversal direction are mutually tilted in opposite sides relative to equator of tire. Tilt angle of transversal grooves (3) to central part (θ1) is sharp. Transversal grooves (3) at both sides of central main groove (1) are located with certain shift relative to each other in longitudinal direction, so that along the whole circumference of tire the longitudinal component of transversal groove (3'), i.e. transversal groove (3) projection on longitudinal direction of tire is located. Checkers (5) and ribs (6) of tread contain slots (7) forming directional pattern.

EFFECT: better tire tread characteristics on wet road surface and on snow, higher wear resistance.

10 cl, 7 dwg, 2 tbl

FIELD: transport.

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

Pneumatic tire // 2468930

FIELD: transport.

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

Pneumatic tire // 2466878

FIELD: transport.

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

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 // 2436685

FIELD: transport.

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

Air tire // 2414361

FIELD: transport.

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

Pneumatic tire // 2408471

FIELD: transport.

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

Pneumatic tire // 2388617

FIELD: transport.

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

Pneumatic tire // 2468930

FIELD: transport.

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

Pneumatic tire // 2466878

FIELD: transport.

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

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 // 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 // 2456168

FIELD: transport.

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

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

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

FIELD: transport.

SUBSTANCE: tire tread comprises multiple patterned elements 30. Note here that tread is divided into three parts, i.e. central part 33, first side 31 and second side 32. Lines of edges (311, 312) of first side patterned elements 31 have profiles not complying with lines of edges (321, 322) of second side 32. Difference between absolute angle of mean direction of every aforesaid line (311, 312) and that of lines (321, 322) makes at least ten degrees but does not exceed twenty degrees.

EFFECT: reduced vibration.

4 cl, 6 dwg

FIELD: transport.

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

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