Pneumatic tire

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

 

The technical field

The present invention relates to a pneumatic tire made with a number of blocks, which formed lots of blocks aligned in the circumferential direction of the tire, the tread part and is made with lots of slit drainage grooves in each block, and, in particular, relates to a pneumatic tire, whereby as performance characteristics when driving on dry road surfaces, and operational characteristics when driving on snow can be provided with a large size.

The level of technology

In the pneumatic tire for the winter, such as studless tires, lots of circular grooves, which run in the circumferential direction of the tire, and many of transverse grooves which are in the direction of the width of the tire, are formed in the tread part, a lot of blocks separated by circumferential grooves and transverse grooves and multiple slit drainage grooves, passing in the direction of the width of the tire, are formed in each block (see Patent Documents 1-3).

In the pneumatic tire of this type increase the number of transverse grooves and slit drainage grooves, passing in the direction of the width of the tires increases traction on the snow and provides improved performance when driving on snow However there is a problem namely, that an excessive amount of transverse grooves and slit drainage grooves leads to deterioration of operating characteristics when driving on dry road surfaces due to the reduction of the rigidity of the blocks.

In particular, despite the fact that in recent years in relation to operating characteristics when driving on dry road surfaces there is a need to increase the resistance in the steering direction, including the ability to rebuild on another number/change lanes at high speed in driving conditions with a high speed, for example at speeds exceeding 200 km/h, there is also a need for further improved performance when driving on snow, but currently this cannot be achieved with conventional design protector.

Patent documents

Patent Document 1: Publication of unexamined patent application of Japan No. H7-A;

Patent Document 2: Publication of unexamined patent application of Japan No. 2000-A; and

Patent Document 3: Publication of unexamined patent application of Japan No. 2009-A.

BRIEF description of the INVENTION

The problem which must be solved by the inventions

The present invention is to develop a pneumatic tire, whereby as e is sploitation characteristics when driving on dry road surfaces and operational characteristics when driving on snow can be provided with a large size.

Part of the solution

For solving the problem described above, a pneumatic tire in accordance with the present invention, in which when installing tires on the vehicle mounting direction for the inner side and outer side of the tyre set includes a tread portion, forming an annular shape with the passage in the circumferential direction of the tire, the two parts constituting the sidewall and located on both sides of the tread portion, and two side parts located on the inner side of the parts constituting the sidewall in a radial direction of the tire. In such a pneumatic tire formed of at least one row of blocks formed by numerous blocks aligned in the circumferential direction of the tire, respectively, in the zone of the tread portion located on the inner side of the vehicle, and the area of the tread portion located on the outer side of the vehicle; a lot slit drainage grooves, passing in the direction of the width of the tire, is formed in each of the blocks; the number of blocks forming a row of blocks in the zone located on the inner side of the vehicle, is greater than the number of blocks forming a row of blocks in areas which, located on the outer side of the vehicle; and slit drainage grooves formed in the blocks in the area, located on the outer side of the vehicle, made with the design in which they are linearly along the direction of their depth, and slit drainage grooves formed in the blocks in the area, located on the inner side of the vehicle, made with the design in which they are bending/waviness along the direction of their depth.

The EFFECT of the INVENTION

In the present invention performing a larger number of blocks, forming a row of blocks in the zone of the tread part, which is located on the inner side of the vehicle, compared to the number of blocks forming a row of blocks in the area, located on the outer side of the vehicle, provides improved performance when driving on snow due to the design of the tread, in order from the inner side of the vehicle, and also provides improved performance when driving on dry road surfaces, which include the ability to rebuild on another number/change lanes at high speed, due to the design of the tread in the zone, located on the outer side of the vehicle.

is this case an excessive decrease in the rigidity of the blocks in the area, located on the inner side of the vehicle, increasing the number of blocks forming a row of blocks in the zone located on the inner side of the vehicle, no longer creates opportunities sufficient confirmation of those operating characteristics when driving on dry road surfaces that have been improved, as described above. However, the application of construction in which a slit-like drainage grooves formed in the blocks in the area, located on the outer side of the vehicle, are linearly along the direction of their depth, and application of structures, in which slit drainage grooves formed in the blocks in the area, located on the inner side of the vehicle, are bending/waviness along the direction of their depth, provides a reduction reduction of rigidity of the blocks in the zone located on the inner side of the vehicle, which allows to demonstrate the maximum performance when driving on dry road surfaces. In the result as performance characteristics when driving on dry road surfaces, and operational characteristics when driving on snow can be provided with a large size.

In the present invention to provide as the perfo the operating characteristics when driving on dry road surfaces and operational characteristics when driving on snow size is large, it is preferable to use the design below. In other words, the number of blocks forming a row of blocks in the area, located on the outer side of the vehicle, is preferably from 54 to 72, and the number of blocks forming a row of blocks in the zone located on the inner side of the vehicle, is preferably from 72 to 115, and the difference between the number of blocks in the zone located on the inner side of the vehicle, and the number of blocks in the area, located on the outer side of the vehicle, is preferably from 13 to 43. The density of the slit of the drainage grooves of the blocks in the zone located on the inner side of the vehicle, preferably 1.2 to 2 times the density of the slit of the drainage grooves of the blocks in the area, located on the outer side of the vehicle. The boundary between zone located on the inner side of the vehicle, and an area located on the outer side of the vehicle, preferably set in place located at a distance of 30% to 60% of the width of the zone of contact with the ground, from the edge of the zone of contact with the ground with the inner side of the vehicle. The width of the groove defined for arachnoi grooves, which separates the blocks of the shoulder portion in the zone located on the inner side of the vehicle, preferably greater than the width of the groove defined for the transverse groove, which separates the blocks of the shoulder portion in the area located on the outer side of the vehicle, and the difference between the widths of the grooves of the data blocks is preferably from 0.5 mm to 2.0 mm, the Depth of the groove defined for the transverse groove, which separates the blocks of the shoulder portion in the zone located on the inner side of the vehicle, preferably greater than the depth of the groove defined for the transverse groove, which separates the blocks of the shoulder portion in the area located on the outer side vehicle, and the difference between the depth of grooves of the data blocks is preferably from 1.0 mm to 3.0 mm

In addition, to ensure sufficient operational characteristics when driving on snow index STI clutch with snow, pronounced the following expression (1), is preferably not less than 180.

STI=-6,8+2202ρg+672ρs+7,6Dg (1)

Thus ρg: density of grooves (mm/mm2)=total length (mm) of the groove, passing in the direction of the tyre width/overall size (mm2zones of contact with the ground;

ρs: density of the slit drainage grooves(mm/mm 2)=total length (mm) side slit drainage grooves, passing in the direction of the tyre width/overall size (mm2zones of contact with the ground; and

Dg: the average depth of grooves (mm).

In the present invention, the area of the tread portion located on the inner side of the vehicle, and the area of the tread portion located on the outer side of the vehicle, are the zones that are separated in the ground contact area of the tread part. The area of contact with the ground is an area on a circumferential periphery of the tire defined by the width of the zone of contact with the ground. The width of the zone of contact with the ground, represents the maximum linear distance defined in the axial direction of the tire to surface contact with a flat surface, when the standard load is applied to the tire, mounted on a standard rim, and the tire is inflated to a standard inner pressure, and the tire is installed in the position in which it is perpendicular to the flat surface. "Standard rim" is a rim that is set by the standard for each tire in accordance with the standards defined by the organization for standardization, which include standards that are the basis for tires, such as standards manufacturers Association the Japan automobile tire (JATMA) p is euskotren for standard rim, standards Association tyres and rims (TRA) provides for "design rim" and the standards of the European technical organization for tire and rim (ETRTO) provides for "measuring wheel". "The standard internal pressure is the air pressure set by the standards for each tire in accordance with the standards defined by the organization for standardization, which include the standards that underpin the bus, for example JATMA standards define the maximum air pressure, the standards TRA represent the list of maximum values in a table "TIRE ROAD LIMITS AT VARIOUS COLD INFLATION PRESSURES" ("ULTIMATE LOAD BUS AT VARIOUS INFLATION PRESSURES IN the COLD") and ETRTO standards define "INFLATION PRESSURE" (PRESSURE PUMPING), and this pressure is 180 kPa for bus passenger car. "Standard load" is the load defined by the standards for each tire in accordance with the standards defined by the organization for standardization, which include the standards that underpin the bus, for example JATMA standards determine the maximum carrying capacity, the standards TRA define the list of maximum values in a table "TIRE ROAD LIMITS AT VARIOUS COLD INFLATION PRESSURES" ("ULTIMATE LOAD BUS AT VARIOUS INFLATION PRESSURES IN the COLD") and ETRTO standards define the LOAD CAPACITY" ("LOAD CAPACITY"), standard load is a load that corresponds to 88% of the load for bus passenger vehicle.

BRIEF DESCRIPTION of DRAWINGS

Figure 1 is a longitudinal sectional view illustrating a pneumatic tire in accordance with one embodiment of the present invention.

Figure 2 is an expanded view illustrating a tread pattern of a pneumatic tire in accordance with this embodiment of the present invention.

Figure 3 illustrates a typical combination of blocks in the pneumatic tire of the present invention, and figa is a perspective view illustrating the unit in a zone located on the inner side of the vehicle, and FIGU is a perspective view illustrating the unit in the area, located on the outer side of the vehicle.

Figure 4 illustrates another combination of blocks in the pneumatic tire of the present invention, and figa is a perspective view illustrating the unit in a zone located on the inner side of the vehicle, and FIGU is a perspective view illustrating the unit in the area, located on the outer side of the vehicle.

The BEST WAY of carrying out the INVENTION

Below you will find young is data describing the configuration of the present invention with reference to the accompanying drawings. 1 and 2 illustrate a pneumatic tire in accordance with one embodiment of the present invention. A pneumatic tire is a tire that has the specified direction of the mounting when installing the tires on the vehicle when considering directions back and forth. Figures 1 and 2 the designation “IN” refers to the side of the tyre, located on the inner side of the vehicle when the tire is installed on the vehicle, and the designation “OUT” refers to the side of the tire located on the outer side of the vehicle when the tire is installed on the vehicle.

As illustrated in figure 1, the pneumatic tire according to this variant implementation is made with the tread part 1, running in the circumferential direction of the tire for the formation of annular shape, with the two parts 2, which are the sides that are located on both sides of the tread portion 1, and two side parts 3, which are located on the inner side parts 2, representing the side in the radial direction of the tire.

Layer 4 frame placed between the two side parts 3, 3. Layer 4 of the framework includes many of reinforcing cords, passing in the radial direction of the tire, and bent around the core 5 of a bead located in each of the side parts 3, from inside the it side of the tire toward the outside of the tire. As a rule, the cords of the fibers of organic origin are used as a reinforcing cord layer 4 of the frame, but can be used with steel cords. Filling the cord 6 in the Board having a triangular cross-sectional shape, is located on the periphery of the core 5 of a bead.

Meanwhile, many layers brokerage layer 7 are sealed with the outer circumferential periphery-side layer 4 of the carcass in the tread portion 1. Data layers 7 of the belt include many of reinforcing cords, which have a slope relative to the direction along the tire circumference, and the reinforcing cords are located between the layers so that they overlap with each other. In the layers 7 of the breaker angle of the reinforcing cords with respect to the direction along the circumference of the tire is set in the range from, for example, 10° to 40°. Steel cords are preferably used as a reinforcing cord layer 7 of the breaker. In order to improve durability when driving at high speed, at least one layer of the covering layer 8 of the breaker formed by placing the reinforcing cords at an angle not exceeding 5°, relative to the direction along the circumference of the tire, is located on the outer circumferential peripheral side of the layers 7 of the breaker. Closing layer 8 of the belt preferably has a seamless structure, while the material in the form of strips, images of the config, at least one reinforcing cords laid parallel and covered with rubber, wound continuously in the circumferential direction of the tire. In addition, the covering layer 8 of the breaker can be located so that it will close the layer 7 of the breaker in all places in the width direction, or may be located so that it will close only the peripheries of the layer 7 of the breaker from the outside in the width direction. Cords of nylon, aramid or similar organic fibers are preferably used as reinforcing cords cover layer 8 of the breaker.

It should be noted that the internal construction of the tire described above are given as an example of the construction of pneumatic tires, but the internal design of the tyre is not limited to this example.

As illustrated in figure 2, the tread portion 1 is formed of one circumferential narrow groove 11, which passes with a rectilinear shape in the circumferential direction of the tire, many district inclined grooves 12, which are held in the circumferential direction and are at an angle relative to the direction along the tire circumference, three circumferential main grooves 13, 14 and 15, which are rectilinear shape in the circumferential direction of the tire, a lot of the transverse grooves 21, which are held in the width direction is by bus so that they combine the estimated end with the inner side (IN) vehicle district inclined grooves 12, many of the transverse grooves 22, which are in the direction of the width of the tires so that they connect the circumferential inclined groove 12 with a circumferential main groove 13, the multiple cross grooves 23, which are in the direction of the width of the tires so that they connect the circumferential main groove 13 with circumferential main groove 14, the multiple cross grooves 24, which are held in the direction of the width of the tires so that they connect the circumferential main groove 14 with a circumferential main groove 15, and the many cross grooves 25, which are held in the direction of the width of the tires so that they combine the estimated end from the outside (OUT) of the vehicle with circumferential main groove 15.

Grooves 11-15 and grooves 21-25 share many blocks 31A in the area And the tread portion 1, which is located on the inner side of the vehicle, and share many blocks W in that area In the tread part 1, which is located on the outer side of the vehicle. More precisely, in the zone a, located on the inner side of the vehicle, is formed of four rows of blocks formed by multiple blocks 31A, aligned in the circumferential direction of the tire, and in the area located on the outer sides of the vehicle, formed many blocks W aligned in the circumferential direction of the tire. In addition, many of the slit drainage grooves 32A, passing in the direction of the width of the tire, is formed in each of the blocks 31A, and a lot slit drainage grooves 32V, passing in the direction of the width of the tire, is formed in each of the blocks B.

In the pneumatic tire described above, the number of blocks 31A, forming a row of blocks in area And located on the inner side of the vehicle, is greater than the number of blocks B, forming a row of blocks in the district, located on the outer side of the vehicle. In other words, the density of the transverse grooves 21-23 who share units 31A in the area And located on the inner side of the vehicle, relatively more compared to the density of the transverse grooves 24 and 25 which divide blocks B in the area located on the outer side of the vehicle. Therefore, the operational characteristics when driving on snow can be improved due to the design of the tread in the area And located on the inner side of the vehicle, and operational characteristics when driving on dry road surfaces, including the ability to rebuild on another number/change lanes at high speed, can be improved bliod the OC design protector in the area, located on the outer side of the vehicle.

In this case, the number of radio blocks V, forming a row of blocks on a circumferential periphery of the tire in the area located on the outer side of the vehicle, can be set in the range from 54 to 72, and the number of RA units 31A, forming a row of blocks on a circumferential periphery of the tire in the area And located on the inner side of the vehicle, can be set in the range from 72 to 115, and the difference Δ between the number of blocks of the same row in zone a, located on the inner side of the vehicle, and the number of blocks of one row in zone b, with the outer side of the vehicle, (Δ=RA-RV) can be set in the range from 13 to 43. Due to this, as performance characteristics when driving on dry road surfaces, and operational characteristics when driving on snow can be provided with a large size. When the number of RA units 31A in the area And located on the inner side of the vehicle, is less than 72, reduced the effect of improving the operational characteristics when driving on snow, and, on the contrary, when it exceeds 115, reduced the effect of improving the operational characteristics when driving on dry road surfaces. When the number of radio blocks B in the area located on the outer side of the vehicle, is less than 54, reduced E. the effect of improvement of operational characteristics when driving on snow, and, on the contrary, when it exceeds 72, reduced the effect of improving the operational characteristics when driving on dry road surfaces. When the difference Δ number of blocks is less than 13, the effect of ensuring the operational characteristics of both types when a large amount becomes insufficient, and, on the contrary, when it exceeds 43, performance of any of the two types deteriorate.

In the pneumatic tire described above, slit drainage grooves 32V formed in blocks B in the area located on the outer side of the vehicle, have the structure in which they are linearly along the direction of their depth, and slit drainage grooves 32A formed in the blocks 31A in the area And located on the inner side of the vehicle, have the structure in which they are bending/waviness along the direction of their depth.

Figure 3 illustrates a typical combination of blocks in the pneumatic tire of the present invention. On figa slit drainage grooves 32A formed in the block 31A in the area And located on the inner side of the vehicle, have the design in which they pass with a zigzag shape or a wavy shape with bending/waviness along the direction of their length and are zigzag form or valdaora the Noi form with bending/waviness along the direction of their depth. Unit 31A, with the design of this type has a relatively high rigidity when exposed to external forces acting in the circumferential direction of the tire, and its collapse in the circumferential direction of the tire is less likely. Meanwhile figv slit drainage grooves 32V formed in the block B in the area located on the outer side of the vehicle, have the design in which they pass with a zigzag shape or a wavy shape with bending/waviness along the direction of their length and are linearly along the direction of their depth. Block V with the design of this type has a low stiffness when exposed to external forces acting in the circumferential direction of the tire, as compared with the block 31A.

As described above, application design, in which slit drainage grooves 32V formed in the block B in the area located on the outer side of the vehicle, are linearly along the direction of their depth, and application of structures, in which slit drainage grooves 32A formed in the block 31A in the area And located on the inner side of the vehicle, are bending/waviness along the direction of their depth, provides a reduction reduction of rigidity of the blocks in the zone And inside a hundred is ons of the vehicle, that allows you to demonstrate the most superior performance characteristics when driving on dry road surfaces, as described above. In the result as performance characteristics when driving on dry road surfaces, and operational characteristics when driving on snow can be provided with a large size.

Figure 4 illustrates another combination of blocks in the pneumatic tire of the present invention. On figa slit drainage grooves 32A formed in the block 31A in the area And located on the inner side of the vehicle, have the structure in which they are linearly along the direction of their length and are held with a zigzag shape or a wavy shape with bending/waviness along the direction of their depth. Unit 31A, with the design of this type has a relatively high rigidity when exposed to external forces acting in the circumferential direction of the tire, and its collapse in the circumferential direction of the tire is less likely. Meanwhile figv slit drainage grooves 32V formed in the block B in the area located on the outer side of the vehicle, have the structure in which they are linearly along the direction of their length and are linearly along the direction of their depth.

Block V in the region have the design of this type, has a low stiffness when exposed to external forces acting in the circumferential direction of the tire, as compared with the block 31A.

The combination unit 31A, which is located in zone a, located on the inner side of the vehicle and shown in figa, and block V, which is located in zone b, located on the outer side of the vehicle and shown in figv, also reduces the decrease of the rigidity of the blocks in the area And located on the inner side of the vehicle, thereby allowing you to demonstrate maximum performance when driving on dry road surfaces. In the result as performance characteristics when driving on dry road surfaces, and operational characteristics when driving on snow can be provided with a large size.

In the pneumatic tire described above, the density of the slit of the drainage grooves of the block 31A in the area And located on the inner side of the vehicle, preferably 1.2 to 2 times greater than the density of the slit of the drainage grooves of the block B in the area located on the outer side of the vehicle. The density of the slit of the drainage grooves of the block 31A in the area And located on the inner side of the vehicle, provided is employed, a ratio (%) total length side slit drainage grooves 32A, passing in the direction of the width of the tyre, to the total area of the block 31A included in zone a, located on the inner side of the vehicle. Similarly, the density of the slit of the drainage grooves of the block B in the area located on the outer side of the vehicle, represents the ratio (%) total length side slit drainage grooves 32V, passing in the direction of the width of the tire to the total area of the block B included in the district, located on the outer side of the vehicle. The relative increase in density of the slit drainage grooves in area And located on the inner side of the vehicle, provides improved performance when driving on snow. However, too much increase in density of the slit drainage grooves in area And located on the inner side of the vehicle, leads to deterioration of operating characteristics when driving on dry road surfaces.

In the pneumatic tire described above, the width TCW zone soil contact is defined between the edge EA of the zone of contact with the ground with the inner side of the vehicle and the edge EB of the zone of contact with the ground with the outer side of the vehicle and the boundary between zone a, located on the inner side of the TRANS is Ortego means, and the area located on the outer side of the vehicle, preferably set in place P at a distance of 30% to 60% of the width TCW zone of contact with the ground, from the edge EA of the zone of contact with the ground with the inner side of the vehicle. Separation zone And located on the inner side of the vehicle, and zone, located on the outer side of the vehicle, designated by R, defined above, ensures both performance when driving on dry road surfaces, and operational characteristics when driving on snow with a large size. When the width of the zone a, located on the inner side of the vehicle is less than 30% of the width TCW zone of contact with the ground, the effect of improving the operational characteristics when driving on snow becomes insufficient, and, on the contrary, when it exceeds 60%, the effect of improving the operational characteristics when driving on dry road surfaces becomes insufficient.

The width of the groove defined for the transverse groove 21, which divides the blocks 31A shoulder part in area And located on the inner side of the vehicle, preferably exceeds the width of the groove defined for the transverse grooves 25, which divides the blocks 32V shoulder h the STI in the area, located on the outer side of the vehicle, and the difference between the widths of the grooves of the data blocks is preferably from 0.5 mm to 2.0 mm due to this, as performance characteristics when driving on dry road surfaces, and operational characteristics when driving on snow can be provided with a large size. If the transverse groove 21 in the zone a, located on the inner side of the vehicle, will be more narrow in comparison with the prescribed ratio above, the effect of improving the operational characteristics when driving on snow becomes insufficient, and, on the contrary, if it is wider compared with the prescribed value described above, the effect of improving the operational characteristics when driving on dry road surfaces becomes insufficient.

The depth of the groove defined for the transverse groove 21, which divides the blocks 31A shoulder part in area And located on the inner side of the vehicle, preferably greater than the depth of grooves defined for the transverse grooves 25, which divides the blocks W shoulder part in area, located on the outer side of the vehicle, and the difference between the depth of grooves of the data blocks is preferably from 1.0 mm to 3.0 mm due to the operational characteristics when driving on dry road surfaces and operational characteristics when driving on snow can be provided with a large size. If the transverse groove 21 in the zone a, located on the inner side of the vehicle will be less deep compared with the prescribed value described above, the effect of improving the operational characteristics when driving on snow becomes insufficient, and, on the contrary, if it is deeper compared with the prescribed value described above, the effect of improving the operational characteristics when driving on dry road surfaces becomes insufficient.

In addition, in the pneumatic tire described above, to ensure sufficient operational characteristics when driving on snow index STI clutch with snow, pronounced the following expression (1), is preferably not less than 180. When the indicator STI clutch with snow is less than 180, confirmation of appropriate performance characteristics during operation of the tire as winter tyres will be difficult.

STI=-6,8+2202ρg+672ρs+7,6Dg (1)

Thus ρg: density of grooves (mm/mm2)=total length (mm) of the groove, passing in the direction of the tyre width/overall size (mm2zones of contact with the ground;

ρs: density of the slit drainage is grooving (mm/mm 2)=total length (mm) side slit drainage grooves, passing in the direction of the tyre width/overall size (mm2zones of contact with the ground; and

Dg: the average depth of grooves (mm).

It should be noted that the groove used in the computation of density ρg of the location of the grooves has a width constituting not less than 1.6 mm, and the depth component not less than 4 mm Between the slit drainage groove used in the computation of the density ρs of the location of slit drainage grooves has a width, which is less than 1.6 mm, and the depth component not less than 4 mm in Addition, the total area of the zone of contact with the ground is the product of the width TCW zone of contact with the ground and the circumference of the tire.

EXAMPLES

Pneumatic tires having a tire size of 245/40R18, in which the direction of the inner side and outer side of the tire when mounting set during installation, were made for the Conventional Example, Comparative Example 1 and Working Examples 1-8, in which many rows of blocks formed by numerous blocks aligned in the circumferential direction of the tire, are formed respectively in the zone of the tread portion located on the inner side of the vehicle, and the area of the tread portion located on the outer side of the vehicle, many slit drainage grooves, the cat is who pass in the direction of the width of the tyre, formed in each block; the number of blocks forming a row of blocks in the zone located on the inner side of the vehicle, the number of blocks forming a row of blocks in the area, located on the outer side of the vehicle, the design of slit drainage grooves formed in the blocks in the area, located on the inner side of the vehicle, the design of slit drainage grooves formed in the blocks in the area, located on the outer side of the vehicle, the ratio of the density of the slit drainage grooves (the ratio of the densities of the location of slit drainage grooves in the blocks in the area, located on the inner side of the vehicle to the density of the slit drainage grooves in the area located on the outer side of the vehicle, the ratio of the width of the zone located on the inner side of the vehicle, the width of the zone of contact with the soil (%) zone, located on the inner side), the width of the groove defined for the transverse grooves of the shoulder portion in the zone located on the inner side of the vehicle, the width of the groove defined for the transverse grooves of the shoulder portion in the area located on the outer side of the vehicle, the depth of the groove defined for the transverse groove placebo the parts in the zone, located on the inner side of the vehicle, and the depth of the groove defined for the transverse grooves of the shoulder portion in the area located on the outer side of the vehicle, is set such as shown in Table 1.

Data test tires were evaluated in accordance with the following assessment methods to evaluate stability when steering on dry road surfaces and stability in the steering when driving on snow, and the results of their evaluation are also shown in Table 1.

Stability when steering on dry road surfaces:

The test tires were mounted on wheels having rim size 18×81/2J and installed on the test vehicle/vehicle having engine capacity, amounting to 2000 cm3and under the conditions, when the air pressure in the tire was 230 kPa, a driver-test was performed sensory evaluation of stability when steering (the ability to rebuild in a different number/change lanes at speeds in the range of up to 240 km/h) on dry road surfaces. The evaluation results were expressed in terms of the indicator, the indicator for the Conventional Example was 100. The large value of the index indicates a higher resistance when steering on dry road surfaces.

The us is ascioti when the steering when driving on snow:

The test tires were mounted on wheels having rim size 18×81/2J and installed on the test vehicle/vehicle having engine capacity, amounting to 2000 cm3and under the conditions, when the air pressure in the tire was 230 kPa, a driver-test was performed sensory evaluation of resistance in the steering when driving on snow. The evaluation results were expressed in terms of the indicator, the indicator for the Conventional Example was 100. The large value of the index indicates a higher resistance in the steering when driving on snow.

Table 1
Usual
hydrated sample
Comparative example 1Working example 1Working example 2Working example 3Working example 4Working example 5Working example 6Working example 7Working example 8
The number of blocksThe AREA WITH the INNER SIDES of the Sabbath. 6810076100100100100100100100
The AREA FROM the OUTSIDE64726472727272727272
Form delived Noi drainage groovesThe AREA FROM the insideFIGUFIGUFIGAFIGAFIGAFIGAFIGAFIGAFIGAFIGA
The AREA FROM the OUTSIDEFIGUFIGUFIGUFIGU FIGUFIGUFIGUFIGUFIGUFIGU
The ratio of the densities of the location of slit drainage grooves11111,531,51,51,52
Share (%) zone, finding, growing from the inside50505050505065505050
Width (mm) groove defined for the cross-Noah grooves in the shoulder partAREA WITH INTERNAL
HER HAND
8,08,08,08,08,0 8,08,09,09,09,0
The AREA WITH the OUTWARDLY-
HAND
8,08,08,08,08,08,08,07,07,05,0
Depth
(mm) groove defined for the cross-Noah grooves in the shoulder part
AREA WITH INTERNAL
HER HAND
8,58,58,58,58,58,58,58,58,58,5
The AREA WITH the OUTWARDLY-
HAND
8,58,58,58,58,58,58,58,57,56,5
Stability during steering when driving on dry road surfaces100951021001009999102104106
Stability during steering when driving on snow100105103106108110110110110102

As can be seen from Table 1, the tire in accordance with the Working Examples 1-8 had compatibility stability when steering on dry road surfaces and stability in the steering when driving on snow with a large size compared with the Conventional Example. Meanwhile, compared with the Conventional Example, the effect of increasing the stability in steering when driving in the snow was found for tires according to Comparative Example 1 due to the increased number of blocks, forming a row of blocks, and simultaneously with this the m resistance when steering on dry road surfaces decreased.

REFERENCE POSITION

1. A pneumatic tire having a specified direction of the mounting for the inner side and outer side of the tire when installing the tires on the vehicle and containing a tread portion, forming an annular shape with the passage in the circumferential direction of the tire, the two parts constituting the sidewall and located on both sides of the tread portion, and two side parts located on the inner side of the parts constituting the sidewall in a radial direction of the tire; there is at least one row of blocks formed by numerous blocks aligned in the circumferential direction of the tire, respectively, in the zone of the tread part, on the inner side of the vehicle, and the area of the tread portion located on the outer side of the vehicle; a lot slit drainage grooves, passing in the direction of the width of the tire and formed in each of the blocks; and the number of blocks forming a row of blocks in the zone located on the inner side of the vehicle, exceeds the number of blocks forming a row of blocks in the area, located on the outer side of the vehicle; slit drainage grooves formed in the blocks in the area, located on the outer side of the vehicle, made with the design, at which they shall rehadat linearly along the direction their depth, and slit drainage grooves formed in the blocks in the area, located on the inner side of the vehicle, made with the design in which they pass by bending along the direction of their depth.

2. Pneumatic tire according to claim 1, in which the number of blocks forming a row of blocks in the area, located on the outer side of the vehicle, ranging from 54 to 72, the number of blocks forming a row of blocks in the zone located on the inner side of the vehicle ranges from 72 to 115 and the difference between the number of blocks in the zone located on the inner side of the vehicle, and the number of blocks in the area, located on the outer side of the vehicle, is from 13 to 43.

3. Pneumatic tire according to claim 1 or 2, in which the density of the slit of the drainage grooves of the blocks in the zone located on the inner side of the vehicle, 1.2-2 times the density of the slit of the drainage grooves of the blocks in the area, located on the outer side of the vehicle.

4. Pneumatic tire according to claim 1 or 2, in which the boundary between the area located on the inner side of the vehicle, and an area located on the outer side of the vehicle, is set in place located at a distance of 30% to 60% of the width of the zone of contact with the ground, from the edge of the ons soil contact with the inner side of the vehicle.

5. Pneumatic tire according to claim 1 or 2, in which the width of the groove defined for the transverse groove, which separates the blocks of the shoulder portion in the zone located on the inner side of the vehicle, exceeds the width of the groove defined for the transverse groove, which separates the blocks of the shoulder portion in the area located on the outer side of the vehicle, and the difference between the widths of the grooves of the data units is from 0.5 mm to 2.0 mm

6. Pneumatic tire according to claim 1 or 2, in which the depth of the groove defined for the transverse groove, which separates the blocks of the shoulder portion in the zone located on the inner side of the vehicle exceeds the depth of the grooves defined for the transverse groove, which separates the blocks of the shoulder portion in the area located on the outer side of the vehicle, and the difference between the depth of grooves of the data blocks is from 1.0 mm to 3.0 mm

7. Pneumatic tire according to claim 1 or 2, in which the indicator STI clutch with snow, expressed by the formula (1)below is not less than 180:

where ρg: density of grooves (mm/mm2) = total length (mm) of the groove, passing in the direction of the tyre width/overall size (mm2zones of contact with the ground;
ρs: density of the slit drainage Cana the wok (mm/mm 2) = total length (mm) side slit drainage grooves, passing in the direction of the tyre width/overall size (mm2zones of contact with the ground; and
Dg: the average depth of grooves (mm).



 

Same patents:

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

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, namely, to large truck tire tread. Tire has tread 1 with absolutely new running surface 10 with at least one running path 2 confined by sidewalls located opposite each other. This running part 2 opens discretely to running surface 10 by multiple parts 21 opened outward of the tread. Note here that said open parts 21 have two ends 212 extending under running surface by channels 22 having inlets 221, 222 connected with ends 212 of said open parts 21. Said inlets 221, 222 feature mean area S. Tread is made so that every part 21 opened to sunning surface has closer 4 at every its end to close cross-section of channel inlets 221, 222 in motion and keep passage open.

EFFECT: better braking performances.

10 cl, 10 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

Pneumatic tire // 2499680

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, namely, to tread pattern of stud-free tire. Pneumatic tire has cutouts 6 extending over tire width and arranged spaced in direction along tire circumference, at least, in shoulder blocks 5a separated by lengthwise grooves extending in tire circumference and crosswise grooves 3 extending over tire width. Open cutouts 6a ad closed cutouts 6b are arranged in turns while depth of open cutouts 6a is smaller than that of closed cutouts 6b.

EFFECT: better running on icy roads, higher wear resistance.

7 cl, 5 dwg, 1 tbl

FIELD: transport.

SUBSTANCE: invention relates to design of slits in tire tread pattern. Treat layer has treat patter forming annular grooves and crosswise grooves while tread blocks 22 with slits are formed. At least some of said slits 27 in lengthwise direction feature wavy configuration. This allows making at least two main surfaces (272A, 272B) in said slit 27 arranged in line and shifted one relative to the other through preset distance C. Transition zone 272C is located between said main surfaces. Adjacent main surface 272A, 272B incorporated locking elements 28 made up of ledge 281 in one of walls of slit 27 and shaped to truncated cone while opposite wall 271 of said slit has recesses 282 of the same shape. Ledge 281 and recess 282 conjugate when walls 281 of aforesaid slit get pressed together. Invention covers appropriate tire tread and to means used in production of the tire.

EFFECT: improved grip.

9 cl, 11 dwg

FIELD: transport.

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

EFFECT: better stability in rainy and dry weather.

8 cl, 6 dwg, 1 tbl

Up!
1The tread portion
2Part representing a sidewall
3Side part
4The carcass layer
5The core of the Board
6Filling cord bead
7The layer of the breaker
8The covering layer of the breaker
11-15Circumferential grooves
21-25Transverse grooves
31A, 31BBlock
32A, 32BSlit drainage groove
AndArea, located on the inner side of the vehicle
BArea located on the outer side of the vehicle