JP2022056753A - Pneumatic tire - Google Patents

Abstract

To provide a pneumatic tire capable of making protection performance and traction performance compatible.SOLUTION: A pneumatic tire is equipped with a side wall extending in a tire diametrical direction. The side wall is equipped with a plurality of side blocks projecting in a tire width direction. The plurality of side blocks includes a first side block and a second side block adjacent to each other in a tire circumferential direction. The second side block is equipped with an extending portion that extends in the tire circumferential direction on the inner side in a tire diametrical direction than the first side block. The extending portion is disposed so as to intersect a tire meridian surface intersecting the first side block, and the extending portion separates from the first side block.SELECTED DRAWING: Figure 3

Description

The present disclosure relates to pneumatic tires.

Conventionally, for example, a pneumatic tire includes a sidewall extending in the tire radial direction, and the sidewall includes a plurality of side blocks protruding in the tire width direction. The plurality of side blocks include a first side block and a second side block that are adjacent to each other in the tire circumferential direction (for example, Patent Document 1).

In the pneumatic tire according to Patent Document 1, the sidewall includes a circumferential protrusion extending from the second side block toward the first side block. As a result, the rubber thickness between the first side block and the second side block is increased by the circumferential protrusion, so that the protection performance of the sidewall (for example, when a stone, a rock, etc. collides with each other, a cut scratch is caused. Performance to suppress the occurrence) can be improved.

By the way, in the pneumatic tire according to Patent Document 1, since the circumferential protrusion is connected to the first side block, the surface and edge components of the side block are reduced. This reduces traction performance (eg, the ability to generate traction when the surface or edge components of the side block touch mud, sand, or rock).

Japanese Unexamined Patent Publication No. 2019-73119

An object of the present disclosure is to provide a pneumatic tire that achieves both protection performance and traction performance.

The pneumatic tire includes a sidewall extending in the tire radial direction, the sidewall comprising a plurality of side blocks protruding in the tire width direction, and the plurality of side blocks being adjacent first sides in the tire circumferential direction. The second side block includes a block and a second side block, the second side block includes an extension portion extending in the tire circumferential direction inside the tire radial direction with respect to the first side block, and the extension portion is the first side. Arranged so as to intersect the tire meridional surface intersecting the block, the extension is separated from the first side block.

Cross-sectional view of a main part of a pneumatic tire according to an embodiment on the tire meridional surface Perspective view of the main part of the pneumatic tire according to the same embodiment Side view of the main part of the pneumatic tire according to the same embodiment (tire width direction view) Enlarged sectional view taken along line IV-IV in FIG. Enlarged view of V area in FIG.

Hereinafter, an embodiment of a pneumatic tire will be described with reference to FIGS. 1 to 5. In each drawing, the dimensional ratio of the drawings and the actual dimensional ratio do not always match, and the dimensional ratios between the drawings do not necessarily match.

As shown in FIG. 1, the pneumatic tire (hereinafter, also simply referred to as “tire”) 1 includes a pair of beads 11, a sidewall 12 extending outward from each bead 11 in the tire radial direction D2, and a pair of sidewalls. It is provided with a tread 13 which is connected to the outer end of each tire radial direction D2 and has a tread surface 13a which is in contact with the ground on the outside of the tire radial direction D2. The tire 1 is mounted on a rim (not shown).

In each figure, the first direction D1 is the tire width direction D1 parallel to the tire rotation axis, and the second direction D2 is the tire radial direction D2 which is the diameter direction of the tire 1 and is the third direction. D3 is the tire circumferential direction D3, which is the direction around the tire rotation axis. The tire equatorial plane S1 is a plane orthogonal to the tire rotation axis and is located at the center of the tire width direction D1, and the tire meridional planes S2, S3, S5, and S6 are planes including the tire rotation axis. It is a plane orthogonal to the tire equatorial plane S1.

In the tire width direction D1, the inside is the side close to the tire equatorial plane S1, and the outside is the side far from the tire equatorial plane S1. Further, in the tire radial direction D2, the inner side is the side close to the tire rotation axis, and the outer side is the side far from the tire rotation axis. Further, among the tire circumferential directions D3, the first peripheral side D31 is also referred to as a first circumferential direction side D31, and the second side D32 is also referred to as a second circumferential direction side D32.

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

Further, the tire 1 includes a carcass 14 bridged between the pair of bead cores 11a and 11a, and an inner liner 15 arranged inside the carcass 14 and facing the internal space of the tire 1 filled with air. There is. The carcass 14 and the inner liner 15 are arranged along the inner circumference of the tire over the bead 11, the sidewall 12, and the tread 13.

The bead 11 includes a rim strip rubber 11c arranged on the outside of the carcass 14 in the tire width direction D1 so as to form an outer surface in contact with the rim. The sidewall 12 includes a sidewall rubber 12a arranged outside the carcass 14 in the tire width direction D1 so as to form an outer surface.

The tread 13 includes a tread rubber 13b constituting the tread surface 13a and a belt 13c arranged between the tread rubber 13b and the carcass 14. The belt 13c includes a plurality of (four in FIG. 1) belt plies 13d. For example, the belt ply 13d includes a plurality of belt cords (for example, organic fibers and metals) arranged in parallel and a topping rubber for covering 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 around the bead core 11a so as to involve the bead core 11a. Further, the carcass ply 14a includes a plurality of ply cords (for example, organic fibers and metals) arranged in a direction substantially orthogonal to the tire circumferential direction D3, and a topping rubber for covering the ply cords.

The inner liner 15 has an excellent function of blocking the permeation of gas in order to maintain the air pressure. In the sidewall 12, as in the present embodiment, the inner liner 15 is in close contact with the inner peripheral side of the carcass 14, and no other member is interposed between the inner liner 15 and the carcass 14. It may be configured as.

Further, for example, in the distance between the carcass ply 14a arranged on the innermost peripheral side and the inner peripheral surface of the tire (inner peripheral surface of the inner liner 15), the distance of the sidewall 12 is the distance of the tread 13. It may be 90% to 180%. Further, for example, the distance of the sidewall 12 may be 120% to 160% of the distance of the tread 13.

The sidewall 12 is at the same position in the tire radial direction D2 as well as the position where the tire maximum width is reached (specifically, the position where the maximum distance is among the distances W1 between the outsides of the carcass 14 in the tire width direction D1). 12b is provided on the outer surface. Hereinafter, the position 12b is referred to as a tire maximum width position 12b.

Further, the sidewall 12 is provided on the outer surface with the outer end 11d of the bead filler 11b in the tire radial direction D2 and the same position 12c in the tire radial direction D2. Hereinafter, the position 12c is referred to as a bead end position 12c.

As shown in FIGS. 1 and 2, the tread rubber 13b includes a plurality of main grooves 13e that continuously extend in the tire circumferential direction D3 over the entire area of the tire circumferential direction D3 of the tread surface 13a. The tread rubber 13b is divided by a plurality of sub-grooves 13f extending to the outer end in the tire width direction D1, a plurality of main grooves 13e arranged on the outermost side in the tire width direction D1, and a plurality of sub-grooves 13f. It is equipped with tread blocks 16 and 17.

The plurality of tread blocks 16 and 17 are arranged so as to be arranged in the tire circumferential direction D3. Then, for example, the tread blocks 16 and 17 may include a first tread block 16 and a second tread block 17 that are adjacent to each other in the tire circumferential direction D3 as in the present embodiment.

As in the present embodiment, on the tread surface 13a, the outer end 16a of the first tread block 16 in the tire width direction D1 is inside the tire width direction D1 from the outer end 17a of the second tread block 17 in the tire width direction D1. It may be arranged in. Further, as in the present embodiment, the first tread block 16 and the second tread block 17 may be alternately arranged in the tire circumferential direction D3.

As shown in FIGS. 2 and 3, the sidewall rubber 12a includes a plurality of first and second side blocks 2 and 3 projecting in the tire width direction D1. The first side block 2 and the second side block 3 may be alternately arranged in the tire circumferential direction D3 as in the present embodiment.

The sidewall rubber 12a protrudes in the tire width direction D1 and extends in the tire circumferential direction D3 outside the tire radial direction D2 from the first and second side blocks 2 and 3, as in the present embodiment. May be provided. Further, the sidewall rubber 12a includes a plurality of third and fourth side blocks 5 and 6 protruding in the tire width direction D1 outside the tire radial direction D2 from the annular protrusion 4 as in the present embodiment. May be.

The annular protrusion 4 may extend continuously in the tire circumferential direction D3 over the entire area of the tire circumferential direction D3 of the sidewall rubber 12a as in the present embodiment. It is said that the third side block 5 and the fourth side block 6 are separated from each other in the tire circumferential direction D3 so as to have a gap as in the present embodiment, and the gap communicates with the auxiliary groove 13f. It may be configured. Further, the third side block 5 and the fourth side block 6 may be alternately arranged in the tire circumferential direction D3 as in the present embodiment.

Further, as in the present embodiment, the first tread block 16, the first side block 2 and the third side block 5 may be arranged so as to intersect the common tire meridional surface S2. For example, as in the present embodiment, a part of the third side block 5 overlaps with a part of the first tread block 16 in the tire width direction D1, and a part of the first side block 2 is in the tire radial direction. In D2 view, it may be configured to overlap with a part of the third side block 5.

Further, as in the present embodiment, the second tread block 17, the second side block 3 and the fourth side block 6 may be arranged so as to intersect the common tire meridional surface S3. For example, as in the present embodiment, a part of the fourth side block 6 overlaps with a part of the second tread block 17 in the tire width direction D1, and a part of the second side block 3 is in the tire radial direction. In D2 view, it may be configured to overlap with a part of the fourth side block 6.

As shown in FIGS. 2 to 4, the first side block 2 includes a first low protrusion 2a and a first high protrusion 2b that protrudes higher than the first low protrusion 2a. As a result, a step is formed between the first low protrusion 2a and the first high protrusion 2b. The first high protrusion 2b may be arranged inside the tire radial direction D2 of the first low protrusion 2a as in the present embodiment.

The second side block 3 includes a second low protrusion 3a and a second high protrusion 3b that protrudes higher than the second low protrusion 3a. As a result, a step is formed between the second low protrusion 3a and the second high protrusion 3b. The second high protrusion 3b may be arranged outside the tire radial direction D2 of the second low protrusion 3a as in the present embodiment.

The protruding height of the first low protruding portion 2a may be the same as the protruding height of the second low protruding portion 3a as in the present embodiment, and is different from, for example, the protruding height of the second low protruding portion 3a. May be. Further, the protruding height of the first high protruding portion 2b may be the same as the protruding height of the second high protruding portion 3b as in the present embodiment, and is different from, for example, the protruding height of the second high protruding portion 3b. May be.

The outer end of the second high protrusion 3b in the tire radial direction D2 is located outside the tire radial direction D2 of the outer end of the first high protrusion 2b in the tire radial direction D2. The inner end of the second high protrusion 3b in the tire radial direction D2 is located outside the tire radial direction D2 of the inner end of the first high protrusion 2b in the tire radial direction D2. As a result, a part of the second high protrusion 3b overlaps with the first high protrusion 2b in the tire circumferential direction D3.

As shown in FIG. 4, the sidewall rubber 12a includes a wall main body portion 12d. The side blocks 2, 3, 5, 6 and the annular projecting portion 4 each project from the wall main body portion 12d to the outside in the tire width direction D1. The annular protrusion 4 may protrude higher than each side block 2, 3, 5, 6 as in the present embodiment. The broken line in FIG. 4 indicates the groove bottom of the sub-groove 13f, that is, the inner edge of the tread blocks 16 and 17 in the tire radial direction D2.

Further, 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, in the cross section of the tire meridional surface, the profile surface S4 of the sidewall 12 may be composed of a plurality of arcs having different radii of curvature. The protrusion height of each side block 2, 3, 5, 6 and the annular protrusion 4 means the height of the profile surface S4 protruding in the normal direction.

Each side block 2, 3, 5, 6 and the annular protrusion 4 have surface and edge components. By forming an uneven shape on the part that comes into contact with mud, sand, and rock, the area that comes into contact with mud, sand, and rock becomes large, and the surface and edges due to the uneven shape vary. It makes it easier to touch the mud, sand, and rocks at the location. As a result, the uneven shape is formed in the portion in contact with the mud, sand, and rock, and the traction performance is improved.

For example, when each side block 2, 3, 5, 6 and the annular protrusion 4 shear mud and sand, traction is generated by the resistance of the shear. Further, for example, when each side block 2, 3, 5, 6 and the annular protrusion 4 come into contact with the rock, traction is generated by the friction of the contact.

The side blocks 2, 3, 5, 6 and the annular protrusion 4 are arranged outside the bead end position 12c (see FIG. 1) in the tire radial direction D2. For example, it is preferable that the side blocks 2, 3, 5, 6 and the annular protrusion 4 are arranged outside the tire radial direction D2 with respect to the tire maximum width position 12b as in the present embodiment.

As a result, the tire 1 of each side block 2, 3, 5, 6 and the annular protrusion 4 are settled by the weight of the vehicle in the muddy ground or the sandy ground, and the tire 1 is grounded in the mud or sand. In rocky areas, you can touch uneven rocks. That is, each side block 2, 3, 5, 6 and the annular protrusion 4 touch the ground on a rough road such as a muddy land, a sandy land, and a rocky place.

The side blocks 2, 3, 5, 6 and the annular protrusion 4 are arranged inside the tire radial direction D2 with respect to the tread surface 13a. As a result, the side blocks 2, 3, 5, 6 and the annular protrusion 4 do not touch the ground during normal driving on a flat road.

Here, the second side block 3 and the first side block 2 adjacent to the second side block 3 on the first circumferential direction side D31 will be described with reference to FIG.

As shown in FIG. 5, a part of the first low protrusion 2a is arranged between the first high protrusion 2b and the second side block 3 in the tire circumferential direction D3. As in the present embodiment, a part of the first low protrusion 2a may be arranged between the first high protrusion 2b and the second high protrusion 3b in the tire circumferential direction D3.

The second side block 3 includes an extension portion 3c extending in the tire circumferential direction D3. The extension portion 3c extends inside the tire radial direction D2 from the first side block 2. The extension portion 3c may extend along the edge of the first side block 2 as in the present embodiment. Specifically, the extension portion 3c is parallel to the edge of the first side block 2 (not only completely parallel but also substantially parallel to each other at an angle of intersection of 10 ° or less, as in the present embodiment. ) May be extended.

The extension portion 3c is separated from the first side block 2. That is, the base end portion (first end portion) 3d of the extension portion 3c is in contact with the second high protrusion portion 3b, and the tip end portion (second end portion) 3e of the extension portion 3c is from the first side block 2. is seperated. Further, the extension portion 3c may be provided with a bending portion 3f that bends toward the first side block 2 on the tip end side as in the present embodiment. In FIG. 5, the broken line indicates the boundary between the second low protrusion 3a and the extension 3c.

The extension portion 3c is arranged so as to intersect the tire meridional surface S5 that intersects the first side block 2. Specifically, the tip portion 3e of the extension portion 3c is arranged so as to intersect the tire meridional surface S5 that intersects the first high protrusion portion 2b. The base end portion 3d of the extension portion 3c may be arranged so as to intersect the tire meridional surface S6 intersecting the second high protrusion portion 3b as in the present embodiment.

A part of the extension portion 3c may overlap with the first side block 2 in the tire radial direction D2 as in the present embodiment. Further, the tip portion 3e of the extension portion 3c may overlap with the first high protrusion portion 2b in the tire radial direction D2 as in the present embodiment. Further, the base end portion 3d of the extension portion 3c may overlap with the second high protrusion portion 3b in the tire radial direction D2 as in the present embodiment.

Further, the first high protrusion 2b protrudes higher than the extension 3c. The protruding height of the extension portion 3c may be lower than the protruding height of the second high protruding portion 3b as in the present embodiment. Further, the protruding height of the extension portion 3c may be the same as the protruding height of the second low protruding portion 3a as in the present embodiment.

Further, the first side block 2 and the second side block 3 adjacent to the second peripheral direction D32 side of the first side block 2 are separated from each other in the tire circumferential direction D3. As a result, the sidewall rubber 12a is provided with a groove 7 extending in the tire radial direction D2 between the first side block 2 and the second side block 3. The groove 7 includes a bent portion 7a formed by the extension portion 3c.

Further, the groove 7 has an outer portion 7b arranged outside the tire radial direction D2, an inner portion 7c arranged inside the tire radial direction D2, and an outer portion in the tire radial direction D2 as in the present embodiment. An intermediate portion 7d arranged between the 7b and the inner portion 7c may be provided. The bent portion 7a is formed by inclining the intermediate portion 7d and the inner portion 7c to the opposite side with respect to the tire radial direction D2.

For example, as in the present embodiment, the intermediate portion 7d extends toward the second circumferential direction D32 toward the inside of the tire radial direction D2, and the inner portion 7c extends toward the inside of the tire radial direction D2. It may be configured to extend to the circumferential side D31. Then, the outer portion 7b may extend along the tire radial direction D2 as in the present embodiment.

Further, the width W2 of the outer end of the groove 7 in the tire radial direction D2 is wider than the width W3 of the inner end of the groove 7 in the tire radial direction D2. The width of the outer portion 7b (for example, the average width) is larger than the width of the intermediate portion 7d (for example, the average width) and the width of the inner portion 7c (for example, the average width) as in the present embodiment. , May be wider.

Returning to FIGS. 2 and 3, the second side block 3 may be connected to the adjacent first side block 2 on the second circumferential direction side D32 as in the present embodiment. Specifically, the second low protrusion 3a of the second side block 3 is connected to the first high protrusion 2b of the first side block 2 adjacent on the second circumferential direction side D32 as in the present embodiment. It may have been done. The first side block 2 adjacent to the second peripheral direction side D32 may be separated from the second side block 3 in the same manner as the first side block 2 adjacent to the first peripheral direction side D31.

The above-mentioned dimensional values, positional relationships, magnitude relationships, etc. are measured in a normal state with no load, in which the tire 1 is mounted on a normal rim and filled with a normal internal pressure. A regular rim is a rim defined for each tire 1 in a standard system including a standard on which the tire 1 is based. For example, a standard rim for JATTA and a "Measuring Rim" for TRA and ETRTO. ..

The regular internal pressure is the air pressure defined for each tire 1 in the standard system including the standard on which the tire 1 is based. The maximum value described in "VARIOUS COLD INFLATION PRESSURES", and in the case of ETRTO, it is "INFRATION PRESSURE".

The configuration of the pneumatic tire 1 according to the present embodiment is as described above, and next, the operation of the pneumatic tire 1 according to the present embodiment will be described.

First, the protection performance will be described.

The base end portion 3d of the extension portion 3c and the second high protrusion portion 3b intersect with the common tire meridional surface S6, and the tip portion 3e and the first high protrusion portion 2b of the extension portion 3c have a common tire meridional surface. It intersects with S5. As a result, the extension portion 3c is arranged between the first high protrusion 2b and the second high protrusion 3b in the tire circumferential direction D3. As a result, the rubber thickness between the first side block 2 and the second side block 3, specifically, between the first high protrusion 2b and the second high protrusion 3b can be increased, so that the protection performance is improved. Can be made to.

Further, a groove 7 is provided between the second side block 3 and the first side block 2 adjacent to each other on the second circumferential direction side D32, and the rubber thickness of the groove 7 is thin. On the other hand, since the groove 7 includes the bent portion 7a, the groove 7 extends in the tire circumferential direction D3, so that the region where the rubber thickness is thin is dispersed in the tire circumferential direction D3. As a result, it is possible to suppress the local deterioration of the protection performance in the tire circumferential direction D3.

Further, at a position where the width of the tire 1 is wide, for example, the maximum width position 12b of the tire, the tire 1 easily touches the rock. As a result, the position close to the tire maximum width position 12b, that is, the inner portion of the first and second side blocks 2 and 3 in the tire radial direction D2 easily touches the rock. On the other hand, since the width W3 of the inner end of the groove 7 in the tire radial direction D2 is narrow, it is possible to effectively suppress the deterioration of the protection performance.

Next, the traction performance will be described.

In the tire radial direction D2, the outer end of the second high protrusion 3b is located outside the outer end of the first high protrusion 2b, and the inner end of the second high protrusion 3b is the first high protrusion. It is located outside the inner end of the portion 2b. As a result, the positions of the first high protrusion 2b and the positions of the second high protrusion 3b are dispersed in the tire radial direction D2. Therefore, traction can be effectively generated by the first and second high protrusions 2b and 3b for rocks of various heights.

Further, since the extension portion 3c is separated from the first side block 2, it is possible to suppress the decrease of the surface and edge components of the first and second side blocks 2 and 3. Moreover, the tip portion 3e of the extension portion 3c is arranged in the vicinity of the first high protrusion portion 2b, whereas the first high protrusion portion 2b protrudes higher than the extension portion 3c. As a result, traction can be sufficiently generated in the first high protrusion portion 2b, so that it is possible to prevent the traction generated by the first side block 2 from being lowered by the extension portion 3c.

Further, since the groove 7 extends in the tire radial direction D2, the first side block 2 and the second side block 3 have a surface and an edge component extending in the tire radial direction D2 in a portion adjacent to the groove 7. .. As a result, the first side block 2 and the second side block 3 can generate traction at a portion adjacent to the groove 7. Therefore, the traction performance can be improved.

Further, when the tire 1 touches the ground, the outer portion in the tire radial direction D2 becomes close to the road surface. Therefore, for example, in a muddy ground or a sandy ground, the outer portion in the tire radial direction D2 of the first and second silo blocks 2 and 3. Is prone to contact with mud and sand. On the other hand, the width W2 at the outer end of the groove 7 is wide. As a result, when the first and second side blocks 2 and 3 shear mud and sand in the portion adjacent to the groove 7, the traction caused by the resistance of the shear becomes large. Therefore, it is possible to improve the traction performance in muddy or sandy areas.

As described above, in the pneumatic tire 1 according to the present embodiment, the protection performance is improved, the deterioration of the protection performance is suppressed, the traction performance is improved, and the deterioration of the traction performance is suppressed. ing. Therefore, it is possible to achieve both protection performance and traction performance at the same time.

From the above, the pneumatic tire 1 includes a sidewall 12 extending in the tire radial direction D2 as in the present embodiment, and the sidewall 12 has a plurality of side blocks 2, 3, 5 protruding in the tire width direction D1. , 6, the plurality of side blocks 2, 3, 5, 6 include a first side block 2 and a second side block 3 adjacent to each other in the tire circumferential direction D3, and the second side block 3 includes. An extension portion 3c extending in the tire circumferential direction D3 inside the tire radial direction D2 from the first side block 2 is provided, and the extension portion 3c intersects the tire meridional surface S5 intersecting the first side block 2. As described above, it is preferable that the extension portion 3c is arranged so as to be separated from the first side block 2.

According to such a configuration, the extension portion 3c extends in the tire circumferential direction D3 inside the tire radial direction D2 from the first side block 2. Since the extension portion 3c is arranged so as to intersect the tire meridional surface S5 that intersects the first side block 2, the extension portion 3c causes the rubber from the second side block 3 to the first side block 2. The thickness becomes thicker. This can improve the protection performance.

Moreover, since the extension portion 3c is separated from the first side block 2, it is possible to suppress the decrease of the surface and edge components of the first and second side blocks 2 and 3. As a result, it is possible to prevent the traction performance from deteriorating. Therefore, it is possible to achieve both protection performance and traction performance at the same time.

Further, in the pneumatic tire 1, as in the present embodiment, the sidewall 12 includes a groove 7 extending in the tire radial direction D2 between the first side block 2 and the second side block 3. The groove 7 preferably includes a bent portion 7a formed by the extension portion 3c.

According to such a configuration, since the groove 7 extends in the tire radial direction D2, the first side block 2 and the second side block 3 can generate traction at a portion adjacent to the groove 7. This makes it possible to improve the traction performance.

Moreover, since the groove 7 having a thin rubber thickness includes the bent portion 7a by the extension portion 3c, the region where the rubber thickness is thin is dispersed in the tire circumferential direction D3. As a result, it is possible to suppress the local deterioration of the protection performance in the tire circumferential direction D3.

Further, in the pneumatic tire 1, as in the present embodiment, the width W2 of the outer end of the groove 7 in the tire radial direction D2 is wider than the width W3 of the inner end of the groove 7 in the tire radial direction D2. , Wide configuration is preferable.

According to such a configuration, when the tire 1 touches the ground, the outer portion in the tire radial direction D2 is closer to the road surface, whereas the width W2 of the outer end of the groove 7 is wide, so that the first side block 2 and When the second side block 3 shears mud or sand in a portion adjacent to the groove 7, the traction caused by the resistance of the shearing can be increased. This makes it possible to improve the traction performance.

Further, in the pneumatic tire 1, as in the present embodiment, the first side block 2 has a first low protrusion 2a and a first high protrusion 2b that protrudes higher than the first low protrusion 2a. And, at least a part of the first low protrusion 2a is arranged between the first high protrusion 2b and the second side block 3 in the tire circumferential direction D3, and the extension portion 3c. Is preferably arranged so as to intersect the tire meridional surface S5 that intersects the first high protrusion 2b.

According to such a configuration, since the extension portion 3c is arranged so as to intersect the tire meridional surface S5 intersecting the first high protrusion portion 2b, the extension portion 3c causes the second side block 3 to the first. The rubber thickness up to the first high protrusion 2b of the side block 2 can be increased. This makes it possible to further improve the protection performance.

Further, in the pneumatic tire 1, it is preferable that the first high protrusion 2b protrudes higher than the extension 3c as in the present embodiment.

According to such a configuration, since the first high protrusion 2b protrudes higher than the extension 3c, traction can be sufficiently generated in the first high protrusion 2b. As a result, it is possible to prevent the traction generated by the first side block 2 from being lowered by the extension portion 3c.

Further, in the pneumatic tire 1, as in the present embodiment, the second side block 3 has a second low protrusion 3a and a second high protrusion 3b that protrudes higher than the second low protrusion 3a. The outer end of the second high protrusion 3b in the tire radial direction D2 is outside the tire radial direction D2 from the outer end of the first high protrusion 2b in the tire radial direction D2. The inner end of the second high protrusion 3b in the tire radial direction D2 is located outside the tire radial direction D2 of the inner end of the first high protrusion 2b in the tire radial direction D2. , Is preferable.

According to such a configuration, the position of the first high protrusion 2b of the first side block 2 and the position of the second high protrusion 3b of the second side block 3 are dispersed in the tire radial direction D2. As a result, traction can be effectively generated by the first high protrusion 2b and the second high protrusion 3b for rocks of various heights.

The pneumatic tire 1 is not limited to the configuration of the above-described embodiment, and is not limited to the above-mentioned action and effect. Further, it goes without saying that the pneumatic tire 1 can be modified in various ways within a range that does not deviate from the gist of the present invention. For example, it is of course possible to arbitrarily select one or a plurality of configurations and methods according to the following various modified examples and adopt them in the configurations and methods according to the above-described embodiment.

(1) In the pneumatic tire 1 according to the above embodiment, the width W2 of the outer end of the tire radial direction D2 of the groove 7 is wider than the width W3 of the inner end of the tire radial direction D2 of the groove 7. Is. However, the pneumatic tire 1 is not limited to such a configuration. The width W2 of the outer end of the groove 7 may be narrower than the width W3 of the inner end of the groove 7, for example, or may be the same as the width W3 of the inner end of the groove 7, for example. ..

(2) Further, in the pneumatic tire 1 according to the above embodiment, the first side block 2 includes a first low protrusion 2a and a first high protrusion 2b, and the second side block 3 has a second low. It is configured to include a protruding portion 3a and a second high protruding portion 3b. However, the pneumatic tire 1 is not limited to such a configuration. For example, the first side block 2 may have the same protrusion height over the entire area. Further, for example, the second side block 3 may have the same protrusion height over the entire area.

(3) Further, in the pneumatic tire 1 according to the above embodiment, the extension portion 3c is arranged so as to intersect the tire meridional surface S5 intersecting the first high protrusion portion 2b. .. However, the pneumatic tire 1 is not limited to such a configuration. For example, the extension portion 3c may be configured to be separated from the first high protrusion portion 2b in the tire circumferential direction D3 in the tire radial direction D2.

(4) Further, in the pneumatic tire 1 according to the above embodiment, the first high protrusion 2b is configured to protrude higher than the extension 3c. However, the pneumatic tire 1 is not limited to such a configuration. The extension portion 3c may be configured to protrude higher than the first high protrusion portion 2b, for example, or may be configured to be the same as the protrusion height of the extension portion 3c, for example.

(5) Further, in the pneumatic tire 1 according to the above embodiment, the outer end of the second high protrusion 3b is located outside the outer end of the first high protrusion 2b in the tire radial direction D2. It is a composition. However, the pneumatic tire 1 is not limited to such a configuration. In the tire radial direction D2, the outer end of the second high protrusion 3b may be, for example, at the same position as the outer end of the first high protrusion 2b, or, for example, the first high protrusion 2b. It may be configured to be located inside the outer end.

(6) Further, in the pneumatic tire 1 according to the above embodiment, the inner end of the second high protrusion 3b is located outside the inner end of the first high protrusion 2b in the tire radial direction D2. It is a composition. However, the pneumatic tire 1 is not limited to such a configuration. In the tire radial direction D2, the inner end of the second high protrusion 3b may be, for example, at the same position as the inner end of the first high protrusion 2b, or, for example, the first high protrusion 2b. It may be configured to be located inside the inner end.

(7) Further, in the pneumatic tire 1, the first and second side blocks 2 and 3 may be provided only on the sidewall 12 on one side, and may be provided on both sidewalls 12. It may be configured to be. Although not particularly limited, for example, the first and second side blocks 2 and 3 may be provided at least on the sidewall 12 arranged on the outside when the vehicle is mounted, among the pair of sidewalls 12. good.

1 ... Pneumatic tire, 2 ... 1st side block, 2a ... 1st low protrusion, 2b ... 1st high protrusion, 3 ... 2nd side block, 3a ... 2nd low protrusion, 3b ... 2nd high protrusion 3c ... extension, 3d ... base end, 3e ... tip, 3f ... bent, 4 ... annular protrusion, 5 ... third side block, 6 ... fourth side block, 7 ... groove, 7a ... bent Part, 7b ... outer part, 7c ... inner part, 7d ... middle part, 11 ... bead, 11a ... bead core, 11b ... bead filler, 11c ... rim strip rubber, 11d ... outer end, 12 ... sidewall, 12a ... sidewall Rubber, 12b ... 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 Sub-groove, 14 ... Carcass, 14a ... Carcass ply, 15 ... Inner liner, 16 ... First tread block, 16a ... Outer end, 17 ... Second tread block, 17a ... Outer end, D1 ... Tire width direction, D2 ... Tire radial direction, D3 ... Tire circumference direction, D31 ... First circumference direction side, D32 ... Second circumference direction side, S1 ... Tire equatorial plane, S2, S3, S5, S6 ... Tire meridional plane, S4 ... Profile plane

Claims (6)

With sidewalls extending in the tire radial direction
The sidewalls include a plurality of side blocks protruding in the tire width direction.
The plurality of side blocks include a first side block and a second side block that are adjacent to each other in the tire circumferential direction.
The second side block includes an extension portion extending in the tire circumferential direction inside the tire radial direction with respect to the first side block.
The extension is arranged so as to intersect the tire meridional surface that intersects the first side block.
The extension is a pneumatic tire away from the first side block. The sidewall includes a groove extending in the tire radial direction between the first side block and the second side block.
The pneumatic tire according to claim 1, wherein the groove includes a bent portion formed by the extension portion. The pneumatic tire according to claim 2, wherein the width of the outer end of the groove in the tire radial direction is wider than the width of the inner end of the groove in the tire radial direction. The first side block comprises a first low protrusion and a first high protrusion that protrudes higher than the first low protrusion.
At least a part of the first low protrusion is arranged between the first high protrusion and the second side block in the tire circumferential direction.
The pneumatic tire according to any one of claims 1 to 3, wherein the extension portion is arranged so as to intersect the tire meridional surface intersecting the first high protrusion portion. The pneumatic tire according to claim 4, wherein the first high protrusion protrudes higher than the extension portion. The second side block includes a second low protrusion and a second high protrusion that protrudes higher than the second low protrusion.
The outer end of the second high protrusion in the tire radial direction is located outside the tire radial direction with respect to the outer end of the first high protrusion in the tire radial direction.
The fourth or five claim, wherein the inner end of the second high protrusion portion in the tire radial direction is located outside the tire radial direction with respect to the inner end of the first high protrusion portion in the tire radial direction. Pneumatic tires.

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