JP7558779B2 - Pneumatic tires - Google Patents

Description

This disclosure relates to pneumatic tires.

Conventionally, for example, the sidewall of a pneumatic tire has multiple side blocks protruding in the tire width direction and grooves arranged between adjacent side blocks (for example, Patent Document 1). The grooves extend in the tire radial direction so as to divide the adjacent side blocks over the entire length in the tire radial direction.

As a result, for example, the side blocks increase the rubber thickness of the sidewall, improving the protection performance of the sidewall (for example, the performance of suppressing cuts when struck by stones, rocks, etc.). However, in the pneumatic tire of Patent Document 1, the groove width is wide, so the protection performance of the sidewall cannot be sufficiently improved.

JP 2020-44882 A

Therefore, the object of this disclosure is to provide a pneumatic tire that can improve the protection performance of the sidewall.

The tire comprises a sidewall extending in the tire radial direction, and a tread having a tread surface on the outer side in the tire radial direction and connected to the outer end of the sidewall in the tire radial direction, the tread comprises a plurality of width grooves extending to the outer end in the tire width direction, and a plurality of tread blocks partitioned by the plurality of width grooves and arranged in the tire circumferential direction, the plurality of tread blocks including first and second tread blocks adjacent to each other in the tire circumferential direction, the sidewall comprises a plurality of side blocks protruding in the tire width direction and arranged in the tire circumferential direction, the plurality of side blocks are arranged in the tire circumferential direction, and the tread comprises a plurality of width grooves extending to the outer end in the tire width direction, the ... The sidewall further includes a first groove disposed between the first and second side blocks, the first groove extending in the tire radial direction so as to divide the first and second side blocks over the entire length in the tire radial direction, the first side block extending in the tire circumferential direction so as to intersect a first tire meridian plane intersecting the first tread block and intersect a second tire meridian plane intersecting the second tread block, and the width dimension of the first groove is 5% or less of the dimension of the first side block in the tire circumferential direction.

FIG. 1 is a cross-sectional view of a main portion of a pneumatic tire according to an embodiment of the present invention taken along a tire meridian plane. FIG. 2 is a perspective view of a main part of a pneumatic tire according to the embodiment; FIG. 3 is a front view of a main part of the pneumatic tire according to the embodiment; FIG. 4 is a front view of a side block according to the embodiment; An enlarged cross-sectional view of line V-V in FIG.

One embodiment of a pneumatic tire will be described below with reference to Figures 1 to 5. Note that in each figure, the dimensional ratios in the drawing do not necessarily match the actual dimensional ratios, and the dimensional ratios between the drawings do not necessarily match either.

As shown in FIG. 1, a pneumatic tire (hereinafter simply referred to as a "tire") 1 includes a pair of beads 11, sidewalls 12 extending outward in the tire radial direction D2 from each bead 11, and a tread 13 connected to the outer ends of each of the pair of sidewalls 12 in the tire radial direction D2 and having a tread surface 13a on the outer side in the tire radial direction D2 that contacts the ground. The tire 1 is mounted on a rim (not shown).

In each figure, the first direction D1 is the tire width direction D1 that is parallel to the tire rotation axis, the second direction D2 is the tire radial direction D2 that is the diameter direction of the tire 1, and the third direction D3 is the tire circumferential direction D3 that is the direction around the tire rotation axis. The tire equatorial plane S1 is a plane that is perpendicular to the tire rotation axis and is located at the center of the tire width direction D1, and the tire meridian planes S2 and S3 are planes that include the tire rotation axis and are perpendicular to the tire equatorial plane S1.

In the tire width direction D1, the inner side refers to the side closer to the tire equatorial plane S1, and the outer side refers to the side farther from the tire equatorial plane S1. In the tire radial direction D2, the inner side refers to the side closer to the tire rotation axis, and the outer side refers to the side farther from the tire rotation axis. In the tire circumferential direction D3, the first side D31 is also called the first circumferential side D31, and the second side D32 is also called the second circumferential side D32.

The bead 11 includes a bead core 11a formed in an annular shape and a bead filler 11b arranged on the outside of the bead core 11a in the tire radial direction D2. For example, the bead core 11a is formed by stacking rubber-coated bead wires (e.g., metal wires), and the bead filler 11b is formed by tapering hard rubber toward the outside in the tire radial direction D2.

The tire 1 also includes a carcass 14 that is stretched between the pair of bead cores 11a, 11a, and an inner liner 15 that is disposed inside the carcass 14 and faces the internal space of the tire 1 that is filled with air. The carcass 14 and the inner liner 15 are disposed along the inner circumference of the tire, spanning the beads 11, sidewalls 12, and tread 13.

The bead 11 has a rim strip rubber 11c arranged on the outside of the carcass 14 in the tire width direction D1 to form an outer surface that contacts the rim. The sidewall 12 has a sidewall rubber 12a arranged on the outside of the carcass 14 in the tire width direction D1 to form an outer surface.

The tread 13 includes tread rubber 13b that constitutes the tread surface 13a, and a belt 13c that is disposed between the tread rubber 13b and the carcass 14. The belt 13c includes multiple belt plies 13d (four in FIG. 1). For example, the belt ply 13d includes multiple belt cords (e.g., organic fiber or metal) arranged in parallel and a topping rubber that covers the belt cords.

The carcass 14 is composed of at least one carcass ply 14a (two in FIG. 1). The carcass ply 14a is folded back around the bead core 11a so as to wrap around the bead core 11a. The carcass ply 14a also includes a plurality of ply cords (e.g., organic fibers or metal) arranged in a direction substantially perpendicular to the tire circumferential direction D3, and a topping rubber that covers the ply cords.

The inner liner 15 has excellent function of preventing gas from passing through in order to maintain air pressure. In addition, in the sidewall 12, as in this embodiment, the inner liner 15 may be in close contact with the inner periphery of the carcass 14, and no other members may be interposed between the inner liner 15 and the carcass 14.

Also, for example, the distance between the innermost carcass ply 14a and the tire inner surface (the inner surface of the inner liner 15) of the sidewall 12 may be 90% to 180% of the distance of the tread 13. Also, for example, the distance of the sidewall 12 may be 120% to 160% of the distance of the tread 13.

The sidewall 12 has a position 12b on its outer surface that is the same as the position of maximum tire width (specifically, the position of maximum distance W1 between the outer sides of the carcass 14 in the tire width direction D1). Hereinafter, this position 12b will be referred to as the tire maximum width position 12b.

The sidewall 12 also has a position 12c on its outer surface that is the same as the outer end 11d of the bead filler 11b in the tire radial direction D2. Hereinafter, this position 12c will be referred to as the bead end position 12c.

As shown in Figures 1 to 3, the tread rubber 13b has multiple main grooves 13e that extend continuously in the tire circumferential direction D3 over the entire area of the tread surface 13a in the tire circumferential direction D3. The tread rubber 13b also has multiple width grooves 13f that extend to the outer end in the tire width direction D1, and multiple tread blocks 2 that are partitioned by the main grooves 13e and the multiple width grooves 13f that are located on the outermost sides in the tire width direction D1.

As shown in Figures 2 to 4, the sidewall rubber 12a has multiple side blocks 3 that protrude in the tire width direction D1 and are aligned in the tire circumferential direction D3, and first grooves 4 that are arranged between adjacent side blocks 3, 3 in the tire circumferential direction D3. The first grooves 4 extend in the tire radial direction D2 so as to separate the adjacent side blocks 3, 3 over the entire length in the tire radial direction D2.

The side block 3 extends in the tire circumferential direction D3. Specifically, for the first and second tread blocks 2, 2 adjacent to each other in the tire circumferential direction D3, the side block 3 intersects with the first tire meridian plane S2 that intersects with the first tread block 2, and intersects with the second tire meridian plane S3 that intersects with the second tread block 2.

The sidewall rubber 12a may be configured, for example, as in this embodiment, to have a first width convex portion 5a protruding outward in the tire width direction D1 from the first tread block 2 and a second width convex portion 5b protruding outward in the tire width direction D1 from the second tread block 2. Also, the tread block 2 may be configured, for example, as in this embodiment, to have a width recess 2a recessed in the tire width direction D1.

For example, the dimension of the first width convex portion 5a in the tire circumferential direction D3 may increase as it moves outward in the tire radial direction D2. Also, for example, the dimension of the second width convex portion 5b in the tire circumferential direction D3 may increase as it moves inward in the tire radial direction D2. Also, for example, the width recess 2a is connected to the edge of the width convex portions 5a, 5b on the tire circumferential direction D3 side, and is connected to the outer edge of the width convex portions 5a, 5b in the tire radial direction D2.

The sidewall rubber 12a may also have an annular protrusion 6 that protrudes outward in the tire width direction D1 and extends in the tire circumferential direction D3, as in this embodiment. The annular protrusion 6 may extend continuously in the tire circumferential direction D3 over the entire area of the sidewall rubber 12a in the tire circumferential direction D3.

The annular protrusion 6 may be disposed further outward in the tire radial direction D2 than the side block 3, as in this embodiment. The width convex portions 5a, 5b and the width concave portion 2a may be disposed further outward in the tire radial direction D2 than the annular protrusion 6, as in this embodiment. That is, the width convex portions 5a, 5b and the width concave portion 2a may be disposed further outward in the tire radial direction D2 than the side block 3, as in this embodiment.

The side blocks 3, width convex portions 5a, 5b, and width concave portions 2a each have a surface and an edge component. By forming an uneven shape in the portions that come into contact with mud, sand, or rocks, the area that comes into contact with the mud, sand, or rocks is increased, and the surfaces and edges due to the uneven shape make it easier for the tire to come into contact with mud, sand, or rocks in various positions. As a result, the traction performance is improved by forming an uneven shape in the portions that come into contact with mud, sand, or rocks.

For example, when the side blocks 3, width convex portions 5a, 5b, and width concave portions 2a shear mud and sand, traction is generated by the resistance of the shear. Also, for example, when the side blocks 3, width convex portions 5a, 5b, and width concave portions 2a come into contact with rocks, traction is generated by the friction of the contact.

The side blocks 3, width convex portions 5a, 5b, and width concave portions 2a are disposed outward in the tire radial direction D2 from the bead end position 12c (see FIG. 1). For example, it is preferable that the side blocks 3, width convex portions 5a, 5b, and width concave portions 2a are disposed outward in the tire radial direction D2 from the tire maximum width position 12b (see FIG. 1) as in this embodiment.

As a result, the side blocks 3, width projections 5a, 5b, and width recesses 2a can make contact with the ground when the tire 1 sinks due to the weight of the vehicle on muddy or sandy ground and is buried in mud or sand, or when on rocky ground, the tire can make contact with uneven rocks. In other words, the side blocks 3, width projections 5a, 5b, and width recesses 2a make contact with the ground on rough roads such as muddy ground, sand, and rocky ground.

The side blocks 3, width convex portions 5a, 5b, and width concave portions 2a are positioned inward of the tread surface 13a in the tire radial direction D2. As a result, the side blocks 3, width convex portions 5a, 5b, and width concave portions 2a do not come into contact with the ground during normal driving on flat roads.

Here, the configuration of the first groove 4 will be explained with reference to Figures 4 and 5.

As shown in Figures 4 and 5, the first groove 4 extends in the tire radial direction D2, so that adjacent side blocks 3, 3 are separated over the entire length in the tire radial direction D2. This increases the edge components of the side blocks 3, for example, and can improve the traction performance of the side blocks 3.

In addition, by separating adjacent side blocks 3, 3 over the entire length in the tire radial direction D2, the surface area of the side surface of the side block 3 on the tire circumferential direction D3 side is increased. This, for example, can improve the heat dissipation performance of the side block 3 (for example, the performance of suppressing a decrease in durability due to an increase in temperature of the side block 3).

The width dimension W2 of the first groove 4 is 5% or less of the dimension W3 of the side block 3 in the tire circumferential direction D3, and is preferably 4% or less, and more preferably 3% or less. As a result, the width of the first groove 4 is narrow, which improves the protection performance of the sidewall 12.

The width dimension W2 of the first groove 4 is the narrowest width dimension W2 of the width dimensions of the first groove 4. The dimension W3 of the side block 3 in the tire circumferential direction D3 is the largest dimension W3 of the side block 3 in the tire circumferential direction D3.

Next, the configuration of the side block 3 will be explained.

As shown in Figures 4 and 5, the side block 3 has a second groove 3a extending in the tire radial direction D2 in the middle part of the tire circumferential direction D3. The middle part refers to the part that is located in the center of the tire circumferential direction D3 among the parts obtained by dividing the side block 3 into three equal parts in the tire circumferential direction D3.

The side block 3 has a first protrusion 3b and a second protrusion 3c that are partitioned by the second groove 3a. Specifically, the side block 3 has the first protrusion 3b that is disposed on the first circumferential side D31 of the second groove 3a, and the second protrusion 3c that is disposed on the second circumferential side D32 of the second groove 3a.

As a result, the surface area of the side block 3 is increased by the second groove 3a, and the heat dissipation performance of the side block 3 can be improved, for example. In addition, the presence of an edge component by the second groove 3a can improve the traction performance of the side block 3, for example. In addition, for example, if a cut scratch occurs in the first protruding portion 3b, the second groove 3a can prevent the cut groove from extending to the second protruding portion 3c, and therefore the protection performance of the side block 3 can be improved.

The presence of the second groove 3a reduces the thickness of the rubber, which may reduce the protective performance of the side block 3 due to the thickness of the rubber. Therefore, the width dimension W4 of the second groove 3a is set to be equal to or smaller than the width dimension W2 of the first groove 4.

This prevents the width of the second groove 3a from becoming wider, and therefore prevents the protective performance of the side block 3 from being reduced due to the presence of the second groove 3a. Note that the width dimension W4 of the second groove 3a is the narrowest width dimension W4 among the width dimensions of the second groove 3a.

The width dimension of the first groove 4 may be constant (not only the same, but also approximately the same with a difference of ±5%) over the entire length, as in this embodiment. The width dimension of the first groove 4 may be increased, for example, toward the inside in the tire radial direction D2, or may be decreased, for example, toward the inside in the tire radial direction D2.

The width dimension of the second groove 3a may be constant (not only the same, but also approximately the same with a difference of ±5%) over the entire length, as in this embodiment. The width dimension of the second groove 3a may be increased, for example, toward the inside in the tire radial direction D2, or may be decreased, for example, toward the inside in the tire radial direction D2.

In this embodiment, the width dimension W4 of the second groove 3a is the same as the width dimension W2 of the first groove 4, but for example, the width dimension W4 of the second groove 3a may be smaller than the width dimension W2 of the first groove 4. Also, in this embodiment, the second groove 3a is open at the inner end in the tire radial direction D2 and closed at the outer end in the tire radial direction D2. As a result, an edge component exists at the inner end in the tire radial direction D2, which improves, for example, traction performance.

Although not particularly limited, the dimension W5 of the second groove 3a in the tire radial direction D2 is preferably 33% (= 1/3) or more of the dimension W6 of the side block 3 in the tire radial direction D2, and more preferably, for example, 50% (= 1/2) or more, and more preferably, for example, 67% (= 2/3) or more. Note that the dimension W6 of the side block 3 in the tire radial direction D2 is the largest dimension W6 among the dimensions of the side block 3 in the tire radial direction D2.

Also, for example, but not limited to, the direction in which the first groove 4 is inclined relative to the tire radial direction D2 may be the same as the direction in which the second groove 3a is inclined relative to the tire radial direction D2. In this embodiment, the first groove 4 and the second groove 3a are directed toward the first circumferential side D31 as they move inward in the tire radial direction D2. This can improve the traction performance on snow, for example, when the tire 1 rotates toward the first circumferential side D31.

The side block 3 may have low protrusions 3d, 3e with a protrusion height H3 lower than the protrusion heights H1, H2 of the first protrusion 3b and the second protrusion 3c, as in this embodiment. The first low protrusion 3d may be connected to the end of the first protrusion 3b on the first circumferential side D31, and the second low protrusion 3e may be connected to the inner end of the first protrusion 3b and the second protrusion 3c in the tire radial direction D2, for example.

As shown in FIG. 5, the sidewall rubber 12a has a wall body portion 12d, and the side block 3 protrudes outward from the wall body portion 12d in the tire width direction D1. The outer surface of the wall body portion 12d in the tire width direction D1 constitutes the profile surface S4 of the sidewall 12.

For example, as shown in FIG. 1, in the tire meridian cross section, the profile surface S4 of the sidewall 12 may be composed of multiple arcs with different radii of curvature. Note that the protruding height of the side block 3 (each of its parts 3a to 3e) refers to the height protruding in the normal direction of the profile surface S4.

Returning to Figures 4 and 5, the protruding height H2 of the second protruding portion 3c is lower than the protruding height H1 of the first protruding portion 3b. That is, at the same position in the tire radial direction D2, the second protruding portion 3c is disposed further inward in the tire width direction D1 than the first protruding portion 3b. As a result, the rubber thickness of the second protruding portion 3c is thinner than the rubber thickness of the first protruding portion 3b, so that, for example, the rubber weight caused by the side block 3 can be prevented from becoming too large. Therefore, uniformity can be improved.

In addition, the area of the first protrusion 3b as viewed in the tire width direction D1 is larger than the area of the second protrusion 3c as viewed in the tire width direction D1. This increases the area of the first protrusion 3b where the rubber thickness is large, improving the protection effect of the side block 3.

Although not particularly limited, for example, as in this embodiment, the bottom surface of the first groove 4 may coincide with the profile surface S4, and the protruding height of the bottom surface of the first groove 4 may be zero. Note that the first groove 4 may be recessed from the wall main body 12d (profile surface S4), and the bottom surface of the first groove 4 may be positioned inward in the tire width direction D1 from the profile surface S4.

The protruding height of the bottom surface of the second groove 3a is higher than the protruding height of the bottom surface of the first groove 4. That is, at the same position in the tire radial direction D2, the bottom surface of the second groove 3a is disposed further outward in the tire width direction D1 than the bottom surface of the first groove 4. Although not particularly limited, the protruding height H4 of the bottom surface of the second groove 3a may be the same as the protruding height H3 of the second low protrusion 3e, for example, as in this embodiment.

The side block 3 may also have linear protrusions 3f to 3h that extend linearly, as in this embodiment. For example, the first linear protrusion 3f may protrude from the first protrusion 3b and extend in the tire radial direction D2, the second linear protrusion 3g may protrude from the first protrusion 3b and extend in the tire circumferential direction D3, and the third linear protrusion 3h may extend along the inner end of the second low protrusion 3e in the tire radial direction D2 on the second circumferential side D32 of the second low protrusion 3e.

As a result, the surface area of the side block 3 is increased by the linear protrusions 3f-3h, which can improve the heat dissipation performance of the side block 3, for example. In addition, the presence of edge components due to the linear protrusions 3f-3h can improve the traction performance of the side block 3, for example. In addition, the rubber thickness is increased by the linear protrusions 3f-3h, which can improve the protective effect of the side block 3, for example.

The above-mentioned dimensional values, positional relationships, and size relationships were measured when the tire 1 was mounted on a standard rim and inflated to the standard internal pressure under standard no-load conditions. A standard rim is a rim that is determined for each tire 1 by the standard system that includes the standard on which the tire 1 is based. For example, a standard rim is called a standard rim for JATMA, and a "Measuring Rim" is called for TRA and ETRTO.

The normal internal pressure is the air pressure set for each tire 1 by each standard in the standard system including the standard on which tire 1 is based. For JATMA, it is the maximum air pressure, for TRA, it is the maximum value listed in the table "TIRE LOAD LIMITS AT VARIOUS COLD INFLATION PRESSURES", and for ETRTO, it is the "INFLATION PRESSURE".

As described above, in this embodiment, the tire 1 includes a sidewall 12 extending in the tire radial direction D2, and a tread 13 having a tread surface 13a on the outer side of the tire radial direction D2 and connected to the outer end of the sidewall 12 in the tire radial direction D2, the tread 13 includes a plurality of width grooves 13f extending to the outer end of the tire width direction D1, and a plurality of tread blocks 2 partitioned by the plurality of width grooves 13f and arranged in the tire circumferential direction D3, the plurality of tread blocks 2 including first and second tread blocks 2, 2 adjacent to each other in the tire circumferential direction D3, the sidewall 12 includes a plurality of side blocks 3 protruding in the tire width direction D1 and arranged in the tire circumferential direction D3, and the plurality of side blocks 3 includes first and second side blocks 3, 3 adjacent to each other in the tire circumferential direction D3, and the sidewall 12 further includes a first groove 4 disposed between the first and second side blocks 3, 3, and the first groove 4 extends in the tire radial direction D2 so as to divide the first and second side blocks 3, 3 over the entire length in the tire radial direction D2, and the first side block 3 extends in the tire circumferential direction D3 so as to intersect with a first tire meridian plane S2 intersecting the first tread block 2 and intersect with a second tire meridian plane S3 intersecting the second tread block 2, and the width dimension W2 of the first groove 4 is preferably 5% or less of the dimension W3 of the first side block 3 in the tire circumferential direction D3.

With this configuration, the first groove 4 extends in the tire radial direction D2, dividing the first and second side blocks 3, 3 over the entire length in the tire radial direction D2. The width dimension W2 of the first groove 4 is 5% or less of the dimension W3 of the first side block 3 in the tire circumferential direction D3, so the width of the first groove 4 is narrow. This improves the protection performance of the sidewall 12.

Furthermore, as in this embodiment, in the pneumatic tire 1, the first side block 3 preferably has a second groove 3a extending in the tire radial direction D2 at the middle portion in the tire circumferential direction D3, and the second groove 3a is open at the inner end in the tire radial direction D2.

With this configuration, the second groove 3a extends in the tire radial direction D2, so the first side block 3 is divided in the tire circumferential direction D3 by the second groove 3a. As a result, for example, if a cut occurs in the first side block 3, the second groove 3a can prevent the cut groove from extending.

Furthermore, as in this embodiment, in the pneumatic tire 1, it is preferable that the width dimension W4 of the second groove 3a is equal to or smaller than the width dimension W2 of the first groove 4.

With this configuration, the width dimension W4 of the second groove 3a is equal to or smaller than the width dimension W2 of the first groove 4, preventing the width of the second groove 3a from becoming wider. This prevents, for example, the protection performance of the first side block 3 from being reduced by the presence of the second groove 3a.

Furthermore, as in this embodiment, in the pneumatic tire 1, the first side block 3 has a first protruding portion 3b arranged on a first side D31 in the tire circumferential direction D3 relative to the second groove 3a, and a second protruding portion 3c arranged on a second side D32 in the tire circumferential direction D3 relative to the second groove 3a, and it is preferable that the protruding height H2 of the second protruding portion 3c is lower than the protruding height H1 of the first protruding portion 3b.

With this configuration, the protruding height H2 of the second protruding portion 3c is lower than the protruding height H1 of the first protruding portion 3b, so the rubber thickness of the second protruding portion 3c is thinner than the rubber thickness of the first protruding portion 3b. This makes it possible to prevent the rubber weight of the first side block 3 from becoming too large.

Furthermore, in the pneumatic tire 1 of this embodiment, it is preferable that the area of the first protrusion 3b as viewed in the tire width direction D1 is larger than the area of the second protrusion 3c as viewed in the tire width direction D1.

With this configuration, the area of the first protruding portion 3b with the high protruding height H1 in the first side block 3 is increased. This increases the area of the first protruding portion 3b with a thick rubber thickness, which can improve the protection effect of the first side block 3, for example.

The pneumatic tire 1 is not limited to the configuration of the embodiment described above, nor is it limited to the effects described above. Furthermore, the pneumatic tire 1 can of course be modified in various ways without departing from the spirit of the present invention. For example, it is of course possible to arbitrarily select one or more of the configurations, methods, etc. related to the various modified examples described below and adopt them in the configurations, methods, etc. related to the embodiment described above.

(1) In the pneumatic tire 1 according to the above embodiment, the second groove 3a is open at the inner end in the tire radial direction D2 and closed at the outer end in the tire radial direction D2. However, the pneumatic tire 1 is not limited to this configuration.

For example, the second groove 3a may be configured to be closed at the inner end in the tire radial direction D2 and open at the outer end in the tire radial direction D2. Also, for example, the second groove 3a may be configured to be open at the inner end in the tire radial direction D2 and open at the outer end in the tire radial direction D2. Also, for example, the second groove 3a may be configured to be closed at the inner end in the tire radial direction D2 and closed at the outer end in the tire radial direction D2.

(2) In addition, in the pneumatic tire 1 according to the above embodiment, the side block 3 is configured to have a second groove 3a extending in the tire radial direction D2. However, the pneumatic tire 1 is not limited to this configuration. For example, the side block 3 may be configured not to have a second groove 3a extending in the tire radial direction D2.

(3) In addition, in the pneumatic tire 1 according to the above embodiment, the width dimension W4 of the second groove 3a is equal to or smaller than the width dimension W2 of the first groove 4. However, the pneumatic tire 1 is not limited to such a configuration. For example, the width dimension W4 of the second groove 3a may be larger than the width dimension W2 of the first groove 4.

(4) In addition, in the pneumatic tire 1 according to the above embodiment, the protruding height H2 of the second protruding portion 3c is lower than the protruding height H1 of the first protruding portion 3b. However, the pneumatic tire 1 is not limited to such a configuration. For example, the protruding height H2 of the second protruding portion 3c may be higher than the protruding height H1 of the first protruding portion 3b. Also, for example, the protruding height H2 of the second protruding portion 3c may be the same as the protruding height H1 of the first protruding portion 3b.

(5) In addition, in the pneumatic tire 1 according to the above embodiment, the area of the first protruding portion 3b as viewed in the tire width direction D1 is larger than the area of the second protruding portion 3c as viewed in the tire width direction D1. However, the pneumatic tire 1 is not limited to this configuration. For example, the area of the first protruding portion 3b as viewed in the tire width direction D1 may be smaller than the area of the second protruding portion 3c as viewed in the tire width direction D1. Also, for example, the area of the first protruding portion 3b as viewed in the tire width direction D1 may be the same as the area of the second protruding portion 3c as viewed in the tire width direction D1.

(6) In addition, in the pneumatic tire 1, the side blocks 3 may be provided only on one sidewall 12, or may be provided on both sidewalls 12. Although not particularly limited, for example, the side blocks 3 may be provided on at least the sidewall 12 that is disposed on the outside when mounted on a vehicle, out of the pair of sidewalls 12.

1...pneumatic tire, 2...tread block, 2a...width recess, 3...side block, 3a...second groove, 3b...first protrusion, 3c...second protrusion, 3d...first low protrusion, 3e...second low protrusion, 3f...first linear protrusion, 3g...second linear protrusion, 3h...third linear protrusion, 4...first groove, 5a...first width protrusion, 5b...second width protrusion, 6...annular protrusion, 11...bead, 11a...bead core, 11b...bead filler, 11c...rim strip rubber, 11d...outer end, 12...sidewall, 12a...sidewall rubber, 1 2b...Tire maximum width position, 12c...Bead end position, 12d...Wall body, 13...Tread, 13a...Tread surface, 13b...Tread rubber, 13c...Belt, 13d...Belt ply, 13e...Main groove, 13f...Width groove, 14...Carcass, 14a...Carcass ply, 15...Inner liner, D1...Tire width direction, D2...Tire radial direction, D3...Tire circumferential direction, D31...First circumferential side, D32...Second circumferential side, S1...Tire equatorial plane, S2...Tire meridian plane, S3...Tire meridian plane, S4...Profile surface

Claims (3)

A sidewall extending in a radial direction of the tire;
A tread having a tread surface on an outer side in the tire radial direction and connected to an outer end of the sidewall in the tire radial direction,
The tread includes a plurality of width grooves extending to an outer end in a tire width direction, and a plurality of tread blocks partitioned by the plurality of width grooves and arranged in a tire circumferential direction, the plurality of tread blocks including first and second tread blocks adjacent to each other in the tire circumferential direction,
The sidewall includes a plurality of side blocks protruding in the tire width direction and arranged in the tire circumferential direction, the plurality of side blocks including first and second side blocks adjacent to each other in the tire circumferential direction,
the sidewall further comprises a first groove disposed between the first and second side blocks;
The first groove extends in the tire radial direction so as to divide the first and second side blocks over the entire length in the tire radial direction,
the first side block extends in the tire circumferential direction so as to intersect a first tire meridian plane that intersects the first tread block and to intersect a second tire meridian plane that intersects the second tread block,
a width dimension of the first groove is 5% or less of a dimension of the first side block in the tire circumferential direction,
The first side block includes a second groove extending in the tire radial direction in a middle portion in the tire circumferential direction,
The second groove is open at an inner end in the tire radial direction,
The first side block includes a first protruding portion disposed on a first side in the tire circumferential direction relative to the second groove, and a second protruding portion disposed on a second side in the tire circumferential direction relative to the second groove,
A pneumatic tire , wherein a protruding height of the second protruding portion is lower than a protruding height of the first protruding portion . The pneumatic tire according to claim 1 , wherein a width dimension of the second groove is equal to or smaller than a width dimension of the first groove. The pneumatic tire according to claim 1 , wherein an area of the first protrusion as viewed in the tire width direction is larger than an area of the second protrusion as viewed in the tire width direction.

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