Pneumatic tire

FIELD: transport.

SUBSTANCE: invention relates to tread pattern of automobile non-spiked tire with improved noise characteristics. Pneumatic tire includes axially-internal lengthwise rows of crown blocks which rows are located at each side of tire equator, and axially-external lengthwise rows of shoulder blocks which rows are located axially to the outside of axially-internal lengthwise rows. Crown blocks are longitudinally separated by the first and the second interleaving transverse grooves of the crown. Shoulder blocks are longitudinally separated by the first and the second interleaving transverse shoulder grooves. The first transverse shoulder grooves have width of not less than 3.5 mm. The first transverse crown grooves have width of not less than 2.0 mm. The second transverse shoulder grooves include axially-internal slit-shaped portion with width of 0.5 to 2.0 mm and axially-external main portion at least 3.5 mm wide. The second transverse crown grooves include axially-internal slit-shaped portion with width of 0.5 to 2.0 mm and axially-external main portion at least 2.0 mm wide.

EFFECT: better tire noise characteristics without impairment of running characteristics over snow-covered road surface.

9 cl, 5 dwg, 1 tbl

 

The technical field

The invention relates to a pneumatic tire, more particularly to a tread pattern suitable for nelipovich tire, comprising four longitudinal row of tread blocks that can improve noise characteristics.

The level of technology

In General, the protector neshipovannyh tires provide plenty of sipes to improve performance on icy roads. In addition, the tread pattern provide the tread grooves (transverse grooves and longitudinal grooves). Such tread grooves form a relatively wide in comparison with grooves for summer tyres, so when driving on snow-covered road surface is relatively large volume of snow could condense in the tread grooves that are in contact with the ground, since a relatively large volume compressed in the tread grooves snow provides a relatively large shear force (hereinafter "the power shift snow in the groove"), and because of this characteristic of the grip (braking, traction) on a snowy road surface is improved.

On the other hand, recently, with the improvement of the rubber mixtures for the protectors nelipovich tires increase the possibility of operating nelipovich tires on dry asphalt road p is the floor. You also need to reduce the noise nelipovich tires along with summer tyres.

If nelipovich tire tread is relatively mild because of the rubber tread and a large number of lamellae, resulting in further noise reduction is more effective reduction of sound pressure level, the so-called resonant noise of the air. Resonant air noise is a loud sound caused by the resonance of the air in the tubular part formed between the wide straight longitudinal groove in the contact area with the ground and the road surface.

If the width of the longitudinal grooves is reduced, the resonance of the air can be suppressed, but inevitable deterioration in running performance on snow and on wet roads.

Brief description of the invention

Therefore, the aim of the present invention is the provision of a pneumatic tire, in which the noise characteristic can be improved without deterioration in performance on snow-covered road surface.

In accordance with the present invention a pneumatic tire comprises a tread provided with at least four longitudinal rows of blocks, comprising the axially inner longitudinal rows of blocks of the crown, located on each side of the tire equator, and the axially outer longitudinal rows of p is echevin blocks, located on the axially outer side from the said axially inner longitudinal rows, where

the crown blocks divided in the longitudinal direction of the first transverse grooves of the crown and the second transverse grooves of the crown, which are arranged alternately in the longitudinal direction, and

shoulder blocks divided in the longitudinal direction of the first shoulder transverse grooves and the second shoulder transverse grooves, which are arranged alternately in the longitudinal direction, and

each first shoulder lateral groove has a width of not less than 3.5 mm along its entire length,

every second of the shoulder lateral groove includes an axially inner narrow portion of a width of from 0.5 to 2.0 mm and an axially outer main portion of a width of not less than 3.5 mm,

each of the first transverse groove of the crown has a width of not less than 2.0 mm along its entire length and

each second transverse groove of the crown includes an axially inner narrow portion of a width of from 0.5 to 2.0 mm and an axially outer main portion of a width of not less than 2.0 mm and greater than the width of the slit part.

In this application various sizes of tires, position etc. refer to the values obtained for the normally inflated unloaded state of the tire, unless otherwise noted.

Normally inflated unloaded condition means that to the being, in which the tire is mounted on a standard rim and inflate to normal internal pressure, but do not load standard load.

Normally inflated loaded condition means a condition in which the tire is mounted on a standard rim and inflate to normal internal pressure and load standard load.

Standard rim means of a wheel rim officially set for tire standards organizations, i.e. JATMA (Japan Association of manufacturers of automotive tyres, Japan and Asia), T&RA (Association for the rims and tyres North America), ETRTO (European technical organization rims and tyres, Europe), STRO (Scandinavian organization for rims and tires, Scandinavia), etc.

Normal pressure and standard load tires represent the maximum air pressure and the maximum load for bus, standardized by the same organization in the table, the air pressure/maximum load or in these specifications. For example, the standard wheel rim is a standard rim" in the JATMA, the "measuring rim" in the system ETRTO, "design rim" in the TRA or the like, the Normal internal pressure represents the "maximum air pressure" in the system JATMA, the "inflation pressure" in the system ETRTO, the maximum pressure given the Noah in the table "Within loads of tyres at different pressures of the cold pumping system TRA or the like The standard load is a "maximum load capacity" in the system JATMA, the "load capacity" in the system ETRTO, the maximum value given in the above table, in the system TRA or the like

However, in the case of tires for passenger cars normal pressure and standard load uniformly set equal to 180 kPa and 88% of the maximum load of the tire, respectively.

The term "width of groove" means the width measured at the top of the groove in the direction perpendicular to the Central line across the width of the groove.

The width TW of the tread is the distance along the axis between the edges Te of the tread, measured during normal inflated unloaded state of the tire.

Edge Te of the tread are axially outer edge of the contact area with the ground (camber angle=0) in normal inflated loaded condition.

Brief description of drawings

Figure 1 shows the cross section of the tread neshipovannyh bus in accordance with the present invention, taken along the line x-X in figure 2.

Figure 2 presents a detailed view of the tread.

Figure 3 presents an enlarged expanded view of the right half of the tread, are presented in figure 1.

4 shows another enlarged detailed view of a protector.

Figure 5(A)-5(C) presents detailed view of the tread of the test tire in comparative examples 1-3.

Description of the preferred embodiments

The embodiment of the present invention is described in more detail below in connection with the accompanying drawings.

In accordance with the present invention a pneumatic tire comprises a tread 2, a pair of spaced apart in the axial direction of the flanges, a pair of sidewalls, the frame is held between the flanges through the protector 2 and the sidewall, and a reinforcing protector breaker located radially outside the carcass in the tread 2, as usual.

A pneumatic tyre in this embodiment is neshipovannyh tire for passenger cars.

As shown in figure 1 and figure 2, the protector 2 is provided with at least three passing continuously the main longitudinal wide straight grooves which includes a pair of fixed axially outer shoulder grooves and at least one main groove 3 of the crown shoulder between the main grooves 4. In this embodiment, at least one main groove 3 of the crown is only one main groove 3 of the crown, located at the equator C bus.

Received the annular shoulder 6 formed between each major shoulder groove 4 and the adjacent edge Te of the tread, comes with a shoulder transverse grooves 10, passing through the entire width of the annular shoulder regions 6, so that they share coleop the EIT shoulder region 6 in the longitudinal direction of the shoulder blocks 6b in the longitudinal row.

The obtained ring-shaped region 5 of the crown, formed between each major shoulder groove 4 and the axially adjacent inner main groove 3 of the crown, provided with transverse grooves 7 of the crown, passing across the width of the annular regions 5 of the crown, dividing the annular region 5 of the crown in the longitudinal direction into blocks 5b crown in a longitudinal row.

Each of the blocks 5b and 6b provided with a zigzag sipes (s).

In order compacted in the main grooves 3 and 4 snow was easily thrown out of them during movement and at the same time, the annular region 5 and 6 could preserve the stiffness, the axial width W1 of the main grooves 3 of the crown and the axial width W2 of the main grooves 4 of the crown preferably set from 3.0 to 8.0% of the total width TW of the tread.

In this embodiment, each of the main grooves 3 and 4 is a straight groove with a constant cross-sectional shape over its entire length. However, it can be used smoothly curved wave-like configuration, rectilinear zigzag configuration, and the like, separately or in combination.

If neshipovannyh tires for passenger cars preferably main grooves 3 of the crown have a depth D1 ranging from 8.0 to 10.0 mm and main shoulder grooves 4 have a depth D2 from 8.0 to 10.0 mm In this particular example, the depth D1 is D2 of the groove is 9.1 mm

When the protector is provided with only one major groove of the crown, as in this embodiment, preferably the Central line G1 of the main grooves 3 of the crown is located at the equator C tire and Central line G2 each major shoulder of the groove 4 is located at an axial distance from Wg2 equator C tire, and the distance Wg2 is preferably not less than 20%, more preferably not less than 23%but not more than 30%, more preferably not more than 28% of the width TW of the tread.

Setting values thus improving the balance of rigidity between the annular area of the crown 5 and the annular shoulder regions 6 and sustainability management can be improved.

Above the shoulder lateral grooves 10 in each row of blocks, as shown in figure 2 and Figure 3 represent the first shoulder transverse grooves 11 and the second shoulder lug grooves 12, which are arranged alternately in the longitudinal direction of the tire.

The first shoulder lateral groove 11 has a width W8 from 3.5 to 10.0 mm along the entire length.

A second transverse shoulder groove 12 formed from the main portion 12a in the width W9 from 3.5 to 10.0 mm, a very narrow slit-like portion 12b essentially constant width W10 from 0.5 to 2.0 mm, passing axially inward from the main part 12a and extending into the main shoulder of the groove 4, and a transition portion 12c, with dinusha the main part 12a and a slit-like portion 12b and having a width, gradually decreasing from the main part 12a to the slit portion 12b.

The transverse grooves 7 of the crown in each row of blocks are the first transverse grooves 8 of the crown and the second lateral grooves 9 of the crown, which are arranged alternately in the longitudinal direction of the tire.

The first transverse groove 9 of the crown has a width W5 from 2.0 to 8.0 mm along the entire length.

The second transverse groove 9 of the crown is formed from the main portion 9a of a width W6 from 2.0 to 8.0 mm, a very narrow slit-like portion 9b is essentially constant width W7 from 0.5 to 2.0 mm, which is smaller than the W6 passing axially inward from the main part 9a and facing to the main groove 3 of the crown, and a transition portion 9c connecting the main portion 9a and a slit-like portion 9b and having a width gradually decreasing from the main part 9a to the slit-like portion 9b.

If the width W5 of the first transverse grooves 8 of the crown is less than 2.0 mm, or the width W6 of the main part 9a of the second lateral grooves 9 of the crown is less than 2.0 mm, the power shift snow in the groove will not be sufficient.

If the width W5 is more than 8.0 mm, or the width W6 is more than 8.0 mm, there is a possibility that the rigidity of the annular region 5 of the crown becomes insufficient, and in this area 5 uneven wear occurs.

Therefore, the width W5 of the first transverse grooves 8 of the crown is not less than 2 mm, preferably, not less than 2.3 mm, more preferably not less than 2.5 mm but not exceeding 8.0 mm, preferably not more than 7.0 mm, more preferably not more than 6.5 mm

The width W6 of the main part 9a of the second lateral grooves 9 of the crown is not less than 2.0 mm, preferably not less than 2.3 mm, more preferably not less than 2.5 mm but not exceeding 8.0 mm, preferably not more than 7.0 mm, more preferably not more than 6.5 mm

For the same reasons, the width W8 of the first lateral shoulder grooves 11 is preferably not less than 4.0 mm, more preferably not less than 5.0 mm, but preferably not more than 9.0 mm, more preferably not more than 8,0 mm

The width W9 of the main part 12a of the second transverse shoulder of the groove 12 is preferably not less than 3.8 mm, more preferably not less than 5.0 mm, but preferably not more than 9.0 mm, more preferably not more than 8,0 mm

The maximum depth of the transverse grooves 7 of the crown and the maximum depth of the transverse shoulder of the groove 10 is from 8.0 to 10.0 mm

The width W7 and W10 slit-like portions 9b and 12b, respectively, are preferably set not more than 2.0 mm, more preferably not more than 1.5 mm, but preferably not less than 1.0 mm, so that a slit-like portion 9b and 12b could block the propagation of the air resonance of sound in the main grooves 3, 4 to the transverse grooves 9, 12, so the image is to reduce the noise.

Setting the width W7 and W10 thus increase the contact area with the ground, as the area of the grooves is reduced by a slit-like portions 9b and 12b, and the force of friction on a dry road surface can be increased. Moreover, due to the increased stiffness, stability control while you are driving on a dry road surface can be improved.

If the width W7 and W10 both slit-like portions 9b and 12b constitute more than 2.0 mm, it becomes difficult to block the propagation of the air resonance of the sound. If the width W7 and W10 represent less than 1.0 mm, the mobility of the blocks 5b, 6b in contact with the ground is very small and the characteristic of throwing the snow is getting worse.

The axial length L3 of the slit portion 9b is preferably not less than 10%, more preferably not less than 15%, but preferably not more than 30%, more preferably not more than 25% of the axial width Wc annular region 5 of the crown.

Axial length L9 of the slit portion 12b is preferably not less than 6%, more preferably not less than 10%, but preferably not more than 24%, more preferably not more than 20% of the axial width Ws annular shoulder 6.

If the axial length L3 and L9 slit-like portions 9b and 12b exceeds the upper limit, the amount of transverse grooves 9, 10 is reduced, and the characteristic snow may deteriorate. If axiallyaligned L3 and L9 smaller than the respective lower limits, the effect of noise reduction may deteriorate.

In this embodiment, as shown in figure 2, each of the transverse grooves 7 (8 and 9) of the crown is a curved groove, consisting of the axially inner portion 7a extending from the main groove 3 of the crown to the main shoulder of the groove 4 with the angle α1 relative to the axial direction of the tire in one longitudinal direction, and an axially outer portion 7b extending from a position located on the axially outer side of the axial center (center line) of the width Wc of the block 5b crown to the main shoulder of the groove 4 with the angle α2 relative to the axial direction of the tire in the opposite longitudinal direction relative to the inner part 7a. Thus, the resistance to the propagation of sound in a transverse groove 7 of the crown increases due to the inflection point between the parts 7a and 7b, and as a result, the noise may be reduced.

To this end, the angle α1 of the inner part 7a and/or the angle α2 outer part 7b is preferably not less than 10 degrees, more preferably not less than 12 degrees.

Here the angle (α1, α2) denotes the angle between the Central line G5 grooves and the axial direction of the tire. However, if the angle α1 and/or the angle α2 is too big(s), stiffness blocks 5b of the crown is reduced, and there will be the chance of uneven wear. Thus, the goal α1 and/or the angle α2 is preferably(s) not more than 30 degrees, more preferably, not more than 25 degrees.

The axial length L2 of the outer part 7b is preferably not less than 5%, more preferably not less than 10%but not more than 25%, more preferably not more than 20% of the width Wc annular region 5 of the crown.

If the axial length L2 is more than 25%, it is difficult to provide the necessary rigidity of the axially inner part of the annular region 5 of the crown, in which the pressure of the soil is high. On the other hand, if the axial length L2 is less than 5%, the resistance to the propagation of sound can not be increased.

Preferably, the first transverse groove 8 of the crown (including both parts, the inner part 7a and the outer part 7b) has a width gradually increasing in a direction axially outward to facilitate the ejection of the compacted into the groove of snow.

In order to axially external output 7o transverse grooves 7 of the crown was not connected with the axially inner output 10i shoulder lateral grooves 10, in other words, the air resonance of the sound coming out of the transverse grooves 7 of the crown, did not spread to the shoulder lateral groove 10, as shown in Figure 3, the longitudinal distance L1 between the first point K1 of intersection and the second point K2 of intersection is preferably set from 0.3 to 0.7 from longitudinal length P1 of the step shoulder lateral grooves 10. the points K1 intersection is the intersection of the centre line G2 of the shoulder main grooves 4 and continue (f) Central line G5 transverse grooves 7 of the crown.

Point K2 of the intersection is the intersection of the center line G2 main shoulder grooves 4 and continuing g the center line G6 of the shoulder lateral grooves 10.

In this embodiment, furthermore, as shown in figure 2 and Figure 3, one narrow longitudinal groove 13 of the crown is located between every two neighboring in the longitudinal direction of the transverse grooves 7 (8 and 9) of the crown, so that in the axial direction blocks 5b crown is divided into two parts: the axially inner section and an axially outer section.

Narrow longitudinal groove 13 of the crown consists of a pair of long parts 13a, passing from the adjacent transverse grooves 7 of the crown in the direction of the center blocks 5b crown in the longitudinal direction, with a slope in the opposite direction at a small angle θ relative to the longitudinal direction of the bus, and the Central part 13b passing between the long portions 13a. Thus, the groove 13 has a zigzag configuration.

In this embodiment two long parts 13a are parallel to each other with the same longitudinal length L6.

Narrow longitudinal groove 13 of the crown passes along the Central line of the width of the annular region 5 of the crown, so that the Central line of the width crosses the center line of the long parts 13a and the Central part 13b of the groove.

The angle 9 is not less than 2.0 degrees, preferred is entrusted, not less than 3 degrees, more preferably not less than 5 degrees but not more than 10 degrees, preferably not more than 8 degrees, more preferably not more than 6.0 degrees.

Thus, the rigidity of the blocks 5b crowns that have a high ground pressure, optimized for driving on icy roads, and the characteristic of the clutch when driving rotation can be improved.

However, if the longitudinal length L5 of the Central part 13b is increased, it becomes difficult to improve the characteristics of the clutch when driving on the turn. On the other hand, if the length L5 is too small, there is a possibility that the rigidity of the annular region 5 of the crown becomes insufficient.

Thus, the longitudinal length L5 of the Central part 13b is preferably not more than 12%, more preferably not more than 10%, but preferably at least 2%, more preferably not less than 4% of the longitudinal length L7 narrow longitudinal grooves 13 of the crown.

To improve the rigidity of the annular region 5 of the crown and characteristics on icy roads with good balance, as shown in Figure 3, the width W3 of the narrow longitudinal grooves 13 of the crown set from 30 to 40% of the width W1 of the main grooves 3 of the crown.

The depth D3 of the narrow longitudinal grooves 13 of the crown is preferably at least 56%, more prepact the tion, at least 61%, but preferably not more than 76%, more preferably not more than 71% of the depth D1 of the main grooves 3 of the crown.

As shown in Figure 4, the second transverse groove 9 of the crown has a longitudinal width W11 on the axially inner edge 13i narrow longitudinal grooves 13 of the crown and the longitudinal width W12 on the axially outer edge 13o narrow longitudinal grooves 13 of the crown, with the width greater than the width W11 W12, whereby the sound from the air injection to the second transverse groove 9 of the crown can be dispersed and weakened with narrow longitudinal groove 3 of the crown, and the noise can be further reduced. Moreover, the power shift snow in the groove increases from the width W11, and the characteristics of the snow better.

Preferably, the width W15 of the second lateral grooves 9 of the crown on the axially outer edge a narrow longitudinal grooves 13 of the crown is not less than 0.6, more preferably not less than 0.7, but not more than 1.0, more preferably not more than 0.8 width W16 of the second lateral grooves 9 of the crown on the axially inner edge 13i narrow longitudinal grooves 13 of the crown.

Moreover, to reduce the noise and increase the rigidity of the annular region 5 of the crown in good balance, as shown in Figure 4, the width W14 of the inner part 7a of the second lateral grooves 9 of the crown at the point of intersection with the outer part 7b site which preferably is not less than 0.6, more preferably not less than 0.7, but not more than 1.0, more preferably not more than 0,9 width W13 outer part 7b of the groove in the place where it goes into the main shoulder groove 4.

As shown in figure 4, to improve the characteristic of the clutch with icy road surface, one edge 9B of the second lateral grooves 9 of the crown is zigzag in part located axially within a relatively narrow longitudinal grooves 13 of the crown.

As shown in figure 3 and 4, the axially outer section of each block 5b crown provided with a notch M in the acute-angled region between B1 narrow longitudinal groove 13 of the crown and the transverse groove 7 of the crown. The notch M has an essentially triangular shape in horizontal projection. In the horizontal projection area A1 of the surface of the recess M is preferably not less than 6%, even more preferably, not less than 11%but not exceeding 26%, even more preferably, not more than 21% of the area A2 of contact with the ground (with the exception of square grooves) blocks 5b crown.

If the surface area is more than 26%, there is a possibility of deterioration of characteristics on icy roads. If this value is less than 6%, it becomes difficult to prevent tearing edge B1 of the block.

In this embodiment, furthermore, as shown in Figure 3, one narrow shoulder longitudinal groove 14 is located between each d is uma adjacent in the longitudinal direction of the transverse grooves 10, separating in the axial direction of the shoulder blocks 6b into two parts: the axially inner section and an axially outer section.

Narrow longitudinal shoulder groove 14 preferably has a width W4 smaller than the width W3 of the narrow longitudinal grooves 13 of the crown, to thereby relatively increase the rigidity of the shoulder blocks 6b. Thus can be obtained a good stability control on dry roads and good stability of control on icy roads. With this purpose, the width W4 of the narrow shoulder of the longitudinal grooves 14 are preferably set from 10 to 20% of the width W1 of the main grooves 3 of the crown. The depth D4 narrow longitudinal shoulder grooves 14 is preferably not less than 6%, more preferably not less than 11%but not exceeding 26%, even more preferably, not more than 21% of the depth D1 of the main grooves 3 of the crown. Narrow longitudinal shoulder grooves 14 in this example are straight grooves. The axial distance between the Central line G4 narrow longitudinal shoulder grooves 14 and edge Te of the tread set from 54 to 74% of the width Ws annular shoulder 6. Thereby optimize the balance of rigidity between the axially outer part and the axially inner part of the annular shoulder 6 for stability control.

In this embodiment the axially outer portion and an axially-the internal portion of the first shoulder transverse grooves 11, located axially outside and inside, respectively, of the point K3 of intersection with a narrow longitudinal shoulder groove 14 are offset in the longitudinal direction on the longitudinal length L12 of not less than 1.0 mm, preferably not less than 2.0 mm

Thus, even in the first shoulder lateral groove 11 provided with a slit part, the air resonance of the sound can be dispersed and weakened in the place of displacement (point K3 of the intersection), and the noise can be lowered. Moreover, the grip with the road surface when driving in rotation increases and the characteristics of the snow can be improved.

However, if the length L12 is too large, you may experience uneven wear of the shoulder blocks 6b.

Thus, the length L12 is preferably not more than 5.0 mm, more preferably not more than 3.0 mm

In addition, as shown in figure 4, width W18 of the axially-inner portion of the first shoulder transverse grooves 11 with the axially inner side of the narrow shoulder longitudinal groove 14 is not less than 0.7, but not more than 1.0 width W17 axially outer part of the first shoulder transverse grooves 11 with the axially outer side of the narrow shoulder longitudinal groove 14.

Comparative tests

Produced and tested tyres, representing studless tires of size 195/65R15 (rim size of 15×6,0J) delegconfig cars.

The test tires had the tread pattern presented in figure 2, and the technical specifications presented in the table. General specifications are as follows:

tread width TW: 166 mm main groove of the crown:

the width W1: 7.2 mm

the depth D1: 9.1 mm main shoulder groove:

the width W2: 7.2 mm

the depth D2: 9.1 mm

Wg2/TW: 24% of the first transverse groove of the crown

the width W5: varies from 2.5 mm to 6.0 mm, the second transverse groove of the crown:

the width W6 of the main part: from 2.5 to 5.3 mm

width W13: 5.3 mm

width W14: 4.0 mm

width W15: 2.7 mm

width W16: 4.0mm first and second transverse grooves of the crown:

the angle α1 of the inner part 13 to 20 degrees

the angle α2 external parts: 15 C of the first shoulder lateral groove:

width W17: 7.2 mm

width W18: 7.9mm second shoulder lateral groove:

the width W9 of the main part: from 3.9 to 5.8 mm narrow longitudinal groove of the crown:

the width W3: 2.5 mm

the width D3: 6,0 mm

the angle θ: 4 degrees narrow longitudinal shoulder groove:

the width W4: 1.25 mm

the width D4: 1.5 mm

L11/Ws: 64%

the length L12: 1.8 mm

The test tires were mounted on the test vehicle (car 2000 cm3, tire pressure 200 kPa) and subjected to the following comparative tests.

Test performance

The test car felt n the snow-covered road surface, icy road surface and a dry asphalt road surface on the route for testing tires, and movement characteristics were evaluated comprehensively with the driver of a test based on the response steering wheel, traction, braking force and traction on snowy and icy pavement and hard imprint on dry pavement.

The results are presented in the table in the form of an index based on comparative example 1 taken as 100, where the higher the value, the better the performance.

Conducting noise tests

In accordance with "test Method the noise characteristics of the tire"defined in Japanese JASO-C606, the test vehicle was taken coasting off the motor at a distance of 50 m at a speed of 60 km/h on a straight-line test route, and the maximum sound level in dB(A) was measured with a microphone set at a height of 1.2 m from the road surface and at a distance of 7.5 m away from the Central line of movement of the Central point of the route.

The results are presented in the table in the form of an index based on comparative example 1 taken as 100, where the higher the value, the better the performance.

1. A pneumatic tire comprising a tread provided with at least four p is dolnymi rows of blocks, including:
the axially inner longitudinal rows of blocks of the crown, located on each side of the tire equator, and
the axially outer longitudinal rows of shoulder blocks, located on the axially outer side from the said axially inner longitudinal rows, where
these crown blocks divided in the longitudinal direction of the first transverse grooves of the crown and the second transverse grooves of the crown, which are arranged alternately in the longitudinal direction, and
these shoulder blocks divided in the longitudinal direction of the first shoulder transverse grooves and the second shoulder transverse grooves, which are arranged alternately in the longitudinal direction, and
each specified first shoulder lateral groove has a width of not less than 3.5 mm along its entire length,
each specified second shoulder lateral groove includes an axially inner narrow portion of a width of from 0.5 to 2.0 mm and an axially outer main portion of a width of not less than 3.5 mm,
each specified first transverse groove of the crown has a width of not less than 2.0 mm along its entire length and
each specified second transverse groove of the crown includes an axially inner narrow portion of a width of from 0.5 to 2.0 mm and an axially outer main portion of a width of not less than 2.0 mm and greater than the width of the slit part.

2. A pneumatic internal line is a mini-bus according to claim 1, in which each of the shoulder blocks and blocks of the crown is equipped with slats.

3. Pneumatic tire according to claim 1, in which each of the first and second transverse grooves of the crown have axially outer part and the axially inner portion that is angled relative to the axial direction of the tire in the opposite direction so that the inflection point between them is located axially outside of the center transverse grooves in the axial direction of the tire.

4. Pneumatic tire according to claim 1, in which passing in the longitudinal direction of the main shoulder grooves that are separated in the axial direction of the axially inner longitudinal row of blocks of the crown from the axially outer longitudinal rows of shoulder blocks that intersect the first and second transverse grooves of the crown at the first point of intersection, and, in addition, the main shoulder grooves intersect the first and second lateral shoulder grooves in the second point of intersection, so that the longitudinal distance between the first intersection and the second intersection point is from 0.3 to 0.7 of the longitudinal length of the step shoulder transverse grooves.

5. Pneumatic tire according to claim 1, in which
each of the blocks of the crown between the first and second transverse grooves of the crown provided with a narrow longitudinal groove of the crown, separating in the axial direction of the blocks of the crown on the axially outside the Yuyu section and the axially inner section, and
narrow longitudinal grooves of the crown includes a pair of long parts and the Central part between them, arranged in the form of a zigzag, so that the long part at an angle of from 2.0 to 10.0 degrees relative to the longitudinal direction of the tire.

6. Pneumatic tire according to claim 5, in which the width of the second transverse grooves of the crown, measured at the axially inner edge of the narrow longitudinal grooves of the crown is greater than the width of the second transverse grooves of the crown, measured at the axially outer edge of the narrow longitudinal grooves of the crown.

7. Pneumatic tire according to claim 5, in which the axially outer section of the blocks of the crown has a sharp edge between the narrow longitudinal groove of the crown and the transverse groove of the crown, and the acute-angled edge provided with a recess, which has an essentially triangular shape in horizontal projection of the crown block.

8. Pneumatic tire according to claim 5, in which
each of the shoulder blocks between the first and second shoulder transverse grooves provided with narrow shoulder longitudinal groove separating in the axial direction of the shoulder block on the axially outer section and an axially inner section, and
narrow longitudinal shoulder groove has a width less than the width of the narrow longitudinal grooves of the crown.

9. Pneumatic tire of claim 8, in which the axially inner portion and an axially outer part of the first the second shoulder lug grooves located axially outside and axially inside, respectively, of the point of intersection of the first shoulder transverse grooves and narrow longitudinal shoulder grooves are offset in the longitudinal direction, and offset in the longitudinal direction is from 1.0 to 2.5 mm



 

Same patents:

Pneumatic tire // 2520265

FIELD: machine building.

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

EFFECT: better road grip on dry road and snow.

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Pneumatic tire // 2519327

FIELD: transport.

SUBSTANCE: method is executed by means of making multiple wave-shaped grooves (20) in central belt (16) of tread between two ring grooves (14) located with tilt relative to equatorial plane of tire and consisting of central small elements (26) equatorial plane CL and side small elements (28) at two sides of this equatorial plane. In each of side small elements (28), the second transversal groove (40) is made containing wide area (42) and narrow area (44). Reducing fragmentation of rubber and cracking in side small elements (28) is achieved due to formation of area (54) with raised bottom on periphery of the first acute-angled area (50) and formation of the first bevelled area (56A) on sharp end of the first acute-angled area (50).

EFFECT: lower noise level, rubber fragmentation and cracking in tread elements, higher dewatering capability.

4 cl, 3 tbl, 13 dwg

FIELD: transport.

SUBSTANCE: tread contains multiple grooved obstructing elements (4) which are formed by and located in circular grooves (2). Herewith, obstructing elements (4) go from bottom (21) of circular groove (2) and blocks at least 70% of cross-section area of circular groove (2). Bending parameter of grooved obstructing elements (4) is determined as E·I/(h3l), where E is module at 10% elongation of material used for grooved obstructing elements, I is inertia moment of grooved obstructing element cross-section, h is height of grooved obstructing element, and l is width of grooved obstructing element, and ranges from 250 Pa to 350 Pa.

EFFECT: providing grooved obstructing elements wear to degree equivalent to tread section wear degree while reducing noise caused by resonance of air columns and maintaining retraction characteristics.

6 cl, 6 dwg, 1 tbl

Pneumatic tire // 2513210

FIELD: transport.

SUBSTANCE: invention relates to tread pattern of tire designed to be used on dry road, ice- and snow-covered roads. Proposed tire comprises unidirectional tread pattern including right and left lengthwise grooves of the crown and crow rib arranged there between. Crown rib has first and second V-like grooves arranged by turns in the tire lengthwise direction. First V-like grooves extend from the left lengthwise groove of the crown. Second V-like grooves extend from the right lengthwise groove of the crown. First and second V-like grooves terminate nearby the rib while their V-like configurations have inflections located, in fact, at tire equator.

EFFECT: stable motion on dry road, ice- and snow-covered roads.

9 cl, 10 dwg, 1 tbl

FIELD: transport.

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

EFFECT: better stability in rainy and dry weather.

8 cl, 6 dwg, 1 tbl

FIELD: transport.

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

EFFECT: improved performances.

10 cl, 7 dwg

FIELD: transport.

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

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

7 cl, 7 dwg, 1 tbl

Air tire (versions) // 2506171

FIELD: transport.

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

EFFECT: better running on ice and snow.

20 cl, 20 dwg, 1 tbl

Pneumatic tire // 2506170

FIELD: transport.

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

EFFECT: better flotation on ice and snow.

7 cl, 7 dwg, 4 tbl

Pneumatic tire // 2504483

FIELD: transport.

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

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

18 cl, 10 tbl, 7 dwg

Automotive tire // 2521033

FIELD: transport.

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

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

20 cl, 4 dwg, 1 tbl

Pneumatic tire // 2520265

FIELD: machine building.

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

EFFECT: better road grip on dry road and snow.

7 cl, 4 dwg

Pneumatic tire // 2513210

FIELD: transport.

SUBSTANCE: invention relates to tread pattern of tire designed to be used on dry road, ice- and snow-covered roads. Proposed tire comprises unidirectional tread pattern including right and left lengthwise grooves of the crown and crow rib arranged there between. Crown rib has first and second V-like grooves arranged by turns in the tire lengthwise direction. First V-like grooves extend from the left lengthwise groove of the crown. Second V-like grooves extend from the right lengthwise groove of the crown. First and second V-like grooves terminate nearby the rib while their V-like configurations have inflections located, in fact, at tire equator.

EFFECT: stable motion on dry road, ice- and snow-covered roads.

9 cl, 10 dwg, 1 tbl

Pneumatic tire // 2508996

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, namely, to tread pattern. Proposed tire comprises multiple circular main grooves extending in tire circumference and multiple running surfaces separated and composed by said circular main grooves in tread zone. Multiple running sections have multiple sipes. At least 90% of sipes located in inner side area represent are 2D sipes and at least 90% of sipes in outer side surface are 3D sipes. Tread zone comprises top and bottom rubber layers. Rubber hardness H1in at -10°C and rubber hardness H2in at 20°C of rubber top layer 151in in inner side area, and hardness H1out at -10°C and hardness H2out at 20°C of rubber top layer 151out in outer side area are related by relationships H1in<H1out and H2in<H2out.

EFFECT: better stability on dry and snowy surface.

18 cl, 9 dwg

Pneumatic tire // 2508995

FIELD: transport.

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

EFFECT: perfected design.

20 cl, 7 dwg

FIELD: transport.

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

EFFECT: improved performances.

10 cl, 7 dwg

FIELD: transport.

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

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

7 cl, 7 dwg, 1 tbl

Air tire (versions) // 2506171

FIELD: transport.

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

EFFECT: better running on ice and snow.

20 cl, 20 dwg, 1 tbl

Pneumatic tire // 2506170

FIELD: transport.

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

EFFECT: better flotation on ice and snow.

7 cl, 7 dwg, 4 tbl

Pneumatic tire // 2504483

FIELD: transport.

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

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

18 cl, 10 tbl, 7 dwg

Automotive tire // 2521033

FIELD: transport.

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

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

20 cl, 4 dwg, 1 tbl

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