CN114604040A - Pneumatic tire - Google Patents

Abstract

The present invention provides a pneumatic tire, wherein a 1 st groove extends along a tire radial direction in a manner of dividing a 1 st side pattern block and a 2 nd side pattern block on the whole length of the tire radial direction, the 1 st side pattern block extends along the tire circumferential direction in a manner of intersecting with a 1 st tire meridian plane intersected with the 1 st tread pattern block and intersecting with a 2 nd tire meridian plane intersected with the 2 nd tread pattern block, the width dimension of the 1 st groove is as follows: the 1 st sidewall block has a dimension in the tire circumferential direction of 5% or less.

Description

Pneumatic tire

Technical Field

The present invention relates to a pneumatic tire.

Background

Conventionally, for example, a side portion of a pneumatic tire includes: a plurality of side blocks projecting in the tire axial direction, and grooves arranged between adjacent side blocks (for example, patent document 1). The groove extends in the tire radial direction so as to divide the adjacent sidewall blocks over the entire length in the tire radial direction.

Accordingly, for example, since the sidewall blocks make the rubber thickness of the sidewall portion thick, the protective performance of the sidewall portion (for example, the performance of suppressing the occurrence of cut when colliding with a stone, a rock, or the like) can be improved. However, in the pneumatic tire according to patent document 1, since the width of the groove is wide, the protection performance of the sidewall portion cannot be sufficiently improved.

Documents of the prior art

Patent literature

Patent document 1: japanese patent laid-open No. 2020 and 44882

Disclosure of Invention

Accordingly, an object of the present invention is to provide a pneumatic tire capable of improving the protection performance of a side portion.

The tire is provided with: a side portion extending in a tire radial direction, and a tread portion having a tread surface on an outer side in the tire radial direction and connected to an outer end of the side portion in the tire radial direction, the tread portion including: a plurality of width grooves extending to an outer end in a tire axial 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: a 1 st tread block and a 2 nd tread block adjacent to each other in the tire circumferential direction, the sidewall portion including: a plurality of sidewall blocks projecting in the tire axial direction and arranged in the tire circumferential direction, the plurality of sidewall blocks including: a 1 st sidewall block and a 2 nd sidewall block adjacent to each other in the tire circumferential direction, the sidewall portion further including: a 1 st groove disposed between the 1 st sidewall block and the 2 nd sidewall block, the 1 st groove extending in the tire radial direction so as to divide the 1 st sidewall block and the 2 nd sidewall block over an entire length in the tire radial direction, the 1 st sidewall block extending in the tire circumferential direction so as to intersect a 1 st tire meridian plane intersecting the 1 st tread block and intersect a 2 nd tire meridian plane intersecting the 2 nd tread block, a width dimension of the 1 st groove being: the 1 st sidewall block has a dimension in the tire circumferential direction of 5% or less.

Drawings

Fig. 1 is a partial cross-sectional view of a tire meridian plane of a pneumatic tire according to an embodiment.

Fig. 2 is a main part perspective view of the pneumatic tire according to the above embodiment.

Fig. 3 is a main part front view of the pneumatic tire according to the above embodiment.

Fig. 4 is a front view of the sidewall block according to the above embodiment.

Fig. 5 is an enlarged sectional end view taken along line v-v of fig. 4.

Description of the reference numerals

1 … pneumatic tire; 2 … tread block; 2a … width recess; 3 … sidewall blocks; 3a … groove 2; 3b …, 1 st projection; 3c … projection 2; 3d … low 1 projection; 3e … low 2 tab; 3f …, 1 st linear projection; 3g … No. 2 linear protrusions; 3h … No. 3 Linear protrusions; 4 … groove 1; 5a … 1 st Width projection; 5b … Width 2 projection; 6 … annular projection; 11 … bead portions; 11a … bead core; 11b … bead filler; 11c … flap rubber; 11d … outer end; 12 … sidewall portions; 12a … sidewall rubber; 12b … tire maximum width position; 12c … bead end positions; 12d … sidewall body portion; 13 … tread portion; 13a … tread surface; 13b … tread band; 13c … belt; 13d … belt ply; 13e … main groove; 13f … width groove; 14 … carcass; 14a … carcass ply; 15 … liner; d1 … tire axial direction; d2 … tire radial direction; d3 … tire circumferential direction; d31 … circumferential side 1; d32 … circumferential side 2; s1 … tire equatorial plane; s2 … tire meridian plane; s3 … tire meridian plane; s4 … contour surface.

Detailed Description

Next, an embodiment of the pneumatic tire will be described with reference to fig. 1 to 5. In the drawings, the aspect ratio does not necessarily coincide with the actual aspect ratio, and the aspect ratio does not necessarily coincide with each other.

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

In each figure, the 1 st direction D1 is: a tire axial direction D1 parallel to the tire rotation axis, and a 2 nd direction D2: the 3 rd direction D3, which is the tire radial direction D2 of the tire 1 in the radial direction, is: the tire circumferential direction D3 which is a direction around the tire rotation axis. The tire equatorial plane S1 is: a plane orthogonal to the tire rotation axis and located at the center position in the tire axial direction D1, and tire meridian planes S2 and S3 are: a plane including the tire rotation axis and orthogonal to the tire equatorial plane S1.

In the tire axial direction D1, the inner side means: the side close to the tire equatorial plane S1, the outer side means: the side away from the tire equatorial plane S1. In the tire radial direction D2, the inner side means: the side close to the axis of rotation of the tire, the outer side, is: the side remote from the axis of rotation of the tire. Further, among the tire circumferential directions D3, the 1 st side D31 is also referred to as the 1 st circumferential side D31, and the 2 nd side D32 is also referred to as the 2 nd circumferential side D32.

The bead unit 11 includes: a bead core 11a formed in an annular shape, and a bead filler 11b disposed outside the bead core 11a in the tire radial direction D2. For example, the bead core 11a is formed by laminating bead wires (e.g., wires) covered with rubber, and the bead filler 11b is formed by tapering hard rubber outward in the tire radial direction D2.

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

The bead unit 11 includes: and a flap rubber 11c disposed outside the carcass 14 in the tire axial direction D1 so as to constitute an outer surface that contacts the rim. The sidewall portion 12 includes: the side rubber 12a is disposed outside the carcass 14 in the tire axial direction D1 so as to constitute an outer surface.

The tread portion 13 includes: a tread rubber 13b constituting the tread surface 13a, and a belt layer 13c disposed between the tread rubber 13b and the carcass 14. The belt layer 13c includes: a plurality of (4 in fig. 1) belt plies 13 d. For example, the belt cord 13d includes: a plurality of belt cords (for example, organic fiber or metal) arranged in parallel, and an upper rubber covering the belt cords.

The carcass 14 is composed of at least 1 (2 in fig. 1) carcass plies 14 a. The carcass ply 14a is folded back around the bead core 11a so as to wind the bead core 11 a. Further, the carcass ply 14a includes: a plurality of cord cords (for example, organic fibers or metal) arranged in a direction substantially orthogonal to the tire circumferential direction D3, and an upper rubber layer covering the cord cords.

The liner 15 has an excellent function of preventing gas from permeating in order to maintain the gas pressure. As in the present embodiment, the sidewall portion 12 may be configured such that: the inner liner 15 is in close contact with the inner circumferential side of the carcass 14, and no other component is present between the inner liner 15 and the carcass 14.

In addition, for example, in the distance between the carcass ply 14a disposed on the innermost circumferential side and the inner circumferential surface of the tire (the inner circumferential surface of the inner liner 15), the distance of the side portion 12 may be 90% to 180% of the distance of the tread portion 13. In addition, for example, the distance of the sidewall portion 12 may be 120% to 160% of the distance of the tread portion 13.

The sidewall 12 includes, on its outer surface: at the same position 12b as the position of the tire maximum width (specifically, the position of the maximum distance among the distances W1 between the outer sides of the carcass 14 in the tire axial direction D1) in the tire radial direction D2. Hereinafter, this position 12b is referred to as a tire maximum width position 12 b.

The sidewall 12 includes, on its outer surface: at the same position 12c in the tire radial direction D2 as the outer end 11D of the bead filler 11b in the tire radial direction D2. Hereinafter, this position 12c is referred to as a bead end position 12 c.

As shown in fig. 1 to 3, the tread rubber 13b includes: a plurality of main grooves 13e continuously extending in the tire circumferential direction D3 over the entire region of the tread surface 13a in the tire circumferential direction D3. Further, the tread rubber 13b includes: a plurality of width grooves 13f extending to the outer end in the tire axial direction D1, and a plurality of tread blocks 2 partitioned by a main groove 13e and the plurality of width grooves 13f arranged on the outermost side in the tire axial direction D1.

As shown in fig. 2 to 4, the side rubber 12a includes: a plurality of side blocks 3 projecting in the tire axial direction D1 and arranged in the tire circumferential direction D3, and a 1 st groove 4 arranged between the side blocks 3, 3 adjacent to each other in the tire circumferential direction D3. The 1 st groove 4 extends along the tire radial direction D2 so as to divide the adjacent side blocks 3 and 3 into segments over the entire length of the tire radial direction D2.

The sidewall blocks 3 extend in the tire circumferential direction D3. Specifically, with respect to the 1 st and 2 nd tread blocks 2, 2 adjacent in the tire circumferential direction D3, the sidewall block 3 intersects the 1 st tire meridian plane S2 intersecting the 1 st tread block 2, and the sidewall block 3 also intersects the 2 nd tire meridian plane S3 intersecting the 2 nd tread block 2.

For example, as in the present embodiment, the side rubber 12a may be configured as: the tire has a 1 st width convex portion 5a protruding from the 1 st tread block 2 in the tire axial direction D1 and a 2 nd width convex portion 5b protruding from the 2 nd tread block 2 in the tire axial direction D1. Further, for example, as in the present embodiment, the tread block 2 may be configured such that: the tire has a width concave portion 2a that is concave in the tire axial direction D1.

For example, the dimension of the 1 st width convex portion 5a in the tire circumferential direction D3 may become larger as it goes toward the outer side in the tire radial direction D2. In addition, for example, the dimension of the 2 nd width convex portion 5b in the tire circumferential direction D3 may become larger as it goes toward the inner side of the tire radial direction D2. For example, the width concave portion 2a is connected to the end edge of the width convex portions 5a and 5b on the side of the tire circumferential direction D3, and is also connected to the end edge of the width convex portions 5a and 5b on the outer side in the tire radial direction D2.

Further, for example, as in the present embodiment, the side rubber 12a may include: an annular protrusion 6 protruding outward in the tire axial direction D1 and extending in the tire circumferential direction D3. The annular protrusion 6 may extend continuously in the tire circumferential direction D3 over the entire region of the side rubber 12a in the tire circumferential direction D3, for example.

Further, for example, as in the present embodiment, the annular protruding portion 6 may be disposed further outward in the tire radial direction D2 than the side blocks 3. For example, as in the present embodiment, the width convex portions 5a and 5b and the width concave portion 2a may be arranged at positions further outward in the tire radial direction D2 than the annular protruding portion 6. That is, the width convex portions 5a and 5b and the width concave portion 2a may be arranged at positions further outward in the tire radial direction D2 than the side blocks 3, for example.

The side block 3, the width convex portions 5a and 5b, and the width concave portion 2a include: composition of the faces or edges. Further, since the concave-convex shape is formed in the portion which comes into contact with the soil, the sand, or the rock, the area which comes into contact with the soil, the sand, or the rock increases, and the surface or the edge of the concave-convex shape easily comes into contact with the soil, the sand, or the rock at various positions. Accordingly, the traction performance can be improved by forming the concave-convex shape in the portion contacting with the soil, the sand, and the rock.

For example, when the side blocks 3, the width convex portions 5a and 5b, and the width concave portion 2a shear soil or sand, drag is generated by resistance of the shear. Further, for example, when the side blocks 3, the width convex portions 5a, 5b, and the width concave portion 2a come into contact with a rock, traction is generated by friction of the contact.

The side blocks 3, the width convex portions 5a and 5b, and the width concave portion 2a are arranged at positions further outward in the tire radial direction D2 than the bead end positions 12c (see fig. 1). For example, the side blocks 3, the width convex portions 5a and 5b, and the width concave portion 2a are preferably arranged at positions outward in the tire radial direction D2 from the tire maximum width position 12b (see fig. 1) as in the present embodiment.

Accordingly, with respect to the side blocks 3, the width convex portions 5a, 5b, and the width concave portion 2a, in a muddy or sand ground, the tire 1 sinks due to the weight of the vehicle, whereby the ground is grounded in a state of being buried in the mud or sand, and in addition, at a rocky place, it can be contacted with a rock having a concave and convex shape. That is, the side blocks 3, the width convex portions 5a, 5b, and the width concave portion 2a contact the ground on a bad road surface such as a muddy ground, a sand ground, and a rocky place.

The side blocks 3, the width convex portions 5a, 5b, and the width concave portion 2a are arranged on the inner side of the tread surface 13a in the tire radial direction D2. Accordingly, the sidewall blocks 3, the width convex portions 5a, 5b, and the width concave portion 2a are not grounded when normally traveling on a flat road.

Here, the structure of the 1 st groove 4 will be described with reference to fig. 4 and 5.

As shown in fig. 4 and 5, the 1 st groove 4 extends in the tire radial direction D2, and the adjacent side blocks 3 and 3 are divided over the entire length in the tire radial direction D2. Accordingly, for example, since the edge component of the side block 3 increases, the traction performance by the side block 3 can be improved.

Further, the adjacent side blocks 3 and 3 are divided into segments in the tire radial direction D2, so that the surface area of the side surface of the side block 3 on the tire circumferential direction D3 side is increased. Accordingly, for example, the heat radiation performance of the side block 3 (for example, performance in which the durability is reduced by an increase in temperature of the side block 3) can be improved.

The width W2 of the 1 st groove 4 is: the dimension W3 of the sidewall block 3 in the tire circumferential direction D3 is 5% or less, for example, preferably 4% or less, and further preferably 3% or less, for example. Accordingly, since the width of the 1 st groove 4 is narrowed, the protection performance of the sidewall portion 12 can be improved.

The width W2 of the 1 st groove 4 is: the narrowest width dimension W2 among the width dimensions of the 1 st groove 4. Further, the dimension W3 of the sidewall block 3 in the tire circumferential direction D3 is: the largest dimension W3 among the dimensions of the sidewall block 3 in the tire circumferential direction D3.

Next, the structure of the side block 3 will be described.

As shown in fig. 4 and 5, the sidewall block 3 includes, in an intermediate portion in the tire circumferential direction D3: and a 2 nd groove 3a extending in the tire radial direction D2. The intermediate portion is: the side blocks 3 are arranged at the center of the tire circumferential direction D3 among the portions trisected in the tire circumferential direction D3.

The sidewall block 3 further includes: a 1 st protrusion 3b and a 2 nd protrusion 3c partitioned by the 2 nd groove 3 a. Specifically, the sidewall block 3 includes: the 1 st projection 3b disposed on the 1 st circumferential side D31 with respect to the 2 nd groove 3a, and the 2 nd projection 3c disposed on the 2 nd circumferential side D32 with respect to the 2 nd groove 3 a.

Accordingly, the surface area of the side block 3 becomes large because of the 2 nd groove 3a, and therefore, for example, the heat radiation performance of the side block 3 can be improved. Further, since the edge component by the 2 nd groove 3a exists, for example, the traction performance by the side block 3 can be improved. In addition, for example, in the case where a cut has occurred in the 1 st protruding portion 3b, the 2 nd groove 3a can suppress the cut groove from extending toward the 2 nd protruding portion 3c, and therefore, the protective performance of the side block 3 can be improved.

In addition, the rubber thickness is reduced due to the presence of the 2 nd groove 3a, and therefore, there is a possibility that: the protective properties of the sidewall blocks 3 due to the rubber thickness. Therefore, the width W4 of the 2 nd groove 3a is: the width W2 of the 1 st groove 4 is not more than.

Accordingly, since the width of the 2 nd groove 3a can be suppressed from increasing, it is possible to suppress: a situation in which the protective performance of the sidewall block 3 is lowered due to the presence of the 2 nd groove 3 a. The width W4 of the 2 nd groove 3a is: the narrowest width dimension W4 among the width dimensions of the 2 nd groove 3 a.

For example, as in the present embodiment, the width of the 1 st groove 4 may be configured as follows: constant over the entire length (not only identical, but also approximately identical covering within ± 5% of the difference). The width of the 1 st groove 4 may be, for example: the tire diameter D2 becomes larger toward the inside, and for example, the tire diameter D2 may be configured such that: becomes smaller toward the inner side of the tire radial direction D2.

For example, as in the present embodiment, the width of the 2 nd groove 3a may be configured as follows: constant over the entire length (not only identical, but also approximately identical covering within ± 5% difference). The width of the 2 nd groove 3a may be: for example, the size of the tire becomes larger as the tire radial direction D2 becomes closer to the inside, and for example, the configuration may be such that: becomes smaller toward the inner side of the tire radial direction D2.

In the present embodiment, the width W4 of the 2 nd groove 3a is the same as the width W2 of the 1 st groove 4, but the width W4 of the 2 nd groove 3a may be smaller than the width W2 of the 1 st groove 4, for example. In the present embodiment, the 2 nd 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. Accordingly, since the edge component is present at the inner end of the tire radial direction D2, traction performance can be improved, for example.

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

For example, although not limited thereto, the direction in which the 1 st groove 4 is inclined with respect to the tire radial direction D2 may be the same as the direction in which the 2 nd groove 3a is inclined with respect to the tire radial direction D2. In the present embodiment, the 1 st groove 4 and the 2 nd groove 3a are directed toward the 1 st circumferential side D31 as they go inward in the tire radial direction D2. Accordingly, for example, when the tire 1 rotates to the 1 st circumferential side D31, the traction performance for snow can be improved.

For example, as in the present embodiment, the sidewall block 3 may include: the projection height H3 is lower than the projection heights H1 and H2 of the 1 st projection 3b and the 2 nd projection 3c, and is lower than the low projections 3d and 3 e. The 1 st low protrusion 3D may be connected to, for example, an end of the 1 st circumferential side D31 of the 1 st protrusion 3b, and the 2 nd low protrusion 3e may be connected to, for example, inner ends of the 1 st protrusion 3b and the 2 nd protrusion 3c in the tire radial direction D2.

As shown in fig. 5, the side rubber 12a includes a sidewall main body 12D, and the sidewall blocks 3 protrude from the sidewall main body 12D outward in the tire axial direction D1. The outer side surface of the sidewall body 12D in the tire axial direction D1 constitutes: contoured surface S4 of sidewall portion 12.

For example, as shown in fig. 1, in a section of the tire meridian plane, the contour surface S4 of the sidewall portion 12 may be constituted by a plurality of arcs having different radii of curvature. The protrusion height of (each portion 3a to 3e of) the side block 3 is: a height of projection toward a normal line direction of the contour surface S4.

Returning to fig. 4 and 5, the projection height H2 of the 2 nd projection 3c is lower than the projection height H1 of the 1 st projection 3 b. That is, at the same position in the tire radial direction D2, the 2 nd protrusion 3c is disposed: further inward in the tire axial direction D1 than the 1 st projecting portion 3 b. Accordingly, since the rubber thickness of the 2 nd projecting portion 3c is thinner than that of the 1 st projecting portion 3b, it is possible to suppress: such as a situation where the rubber weight becomes excessive because of the side blocks 3. Therefore, the degree of balance can be improved.

Moreover, the area of the 1 st projection 3b as viewed in the tire axial direction D1 is larger than the area of the 2 nd projection 3c as viewed in the tire axial direction D1. Accordingly, since the region of the 1 st protruding portion 3b having a large rubber thickness becomes large, the protective effect of the side block 3 can be improved.

Although not particularly limited, for example, as in the present embodiment: the bottom surface of the 1 st groove 4 coincides with the contour surface S4, and the protruding height of the bottom surface of the 1 st groove 4 is zero. Further, the following may be configured: the 1 st groove 4 is recessed from the sidewall body 12D (contour surface S4), and the bottom surface of the 1 st groove 4 is disposed inward of the contour surface S4 in the tire axial direction D1.

The bottom surface of the 2 nd groove 3a protrudes higher than: the height of the bottom surface of the 1 st groove 4. That is, the bottom surfaces of the 2 nd grooves 3a are arranged further outward in the tire axial direction D1 than the bottom surfaces of the 1 st grooves 4 at the same position in the tire radial direction D2. Although not particularly limited, the projecting height H4 of the bottom surface of the 2 nd groove 3a may be the same as the projecting height H3 of the 2 nd low projecting portion 3e, for example, as in the present embodiment.

Further, for example, as in the present embodiment, the side block 3 may include: linear protrusions 3f to 3h extending linearly. For example, it may be configured such that: the 1 st linear protrusion 3f protrudes from the 1 st protrusion 3b and extends in the tire radial direction D2, the 2 nd linear protrusion 3g protrudes from the 1 st protrusion 3b and extends in the tire circumferential direction D3, and the 3 rd linear protrusion 3h extends along the inner end of the 2 nd low protrusion 3e in the tire radial direction D2 on the 2 nd circumferential direction side D32 of the 2 nd low protrusion 3 e.

Accordingly, the surface area of the side block 3 is increased by the linear protrusions 3f to 3h, and therefore, for example, the heat radiation performance of the side block 3 can be improved. Further, since there is an edge component by the linear protrusions 3f to 3h, for example, the traction performance by the side block 3 can be improved. In addition, since the rubber thickness is increased by the linear protrusions 3f to 3h, for example, the protective effect of the side block 3 can be improved.

The dimensional values, positional relationships, dimensional relationships, and the like are measured in a normal state in which the tire 1 is mounted on a normal rim and is under no load filled with normal internal pressure. The regular rim means: in a specification system including a specification under which a tire is based, a rim determined for each tire according to the specification means, for example, a standard rim if JATMA, or a "measurement rim" if TRA and ETRTO.

The normal internal pressure is: in a specification system including the specification to which the tire is subjected, the air pressure determined for each tire 1 in accordance with each specification is the highest air pressure if JATMA, the maximum value described in "tire load limit under various cold inflation pressures" if TRA, and the "inflation pressure" if ETRTO.

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

According to this configuration, the 1 st groove 4 extends along the tire radial direction D2, and the 1 st and 2 nd side blocks 3 and 3 are divided over the entire length in the tire radial direction D2. Further, since the width W2 of the 1 st groove 4 is 5% or less of the dimension W3 of the 1 st sidewall block 3 in the tire circumferential direction D3, the width of the 1 st groove 4 becomes narrow. This can improve the protection performance of the sidewall 12.

Further, as in the present embodiment, in the pneumatic tire 1, it is preferable that the 1 st side block 3 includes, in an intermediate portion in the tire circumferential direction D3: a 2 nd groove 3a extending in the tire radial direction D2, the 2 nd groove 3a being open at an inner end in the tire radial direction D2.

According to this configuration, since the 2 nd groove 3a extends along the tire radial direction D2, the 1 st sidewall block 3 is divided in the tire circumferential direction D3 by the 2 nd groove 3 a. Accordingly, for example, in the case where the 1 st sidewall block 3 has a cut, the 2 nd groove 3a can suppress the extension of the cut groove.

In addition, as in the present embodiment, in the pneumatic tire 1, it is preferable that the width W4 of the 2 nd groove 3a is equal to or less than the width W2 of the 1 st groove 4.

According to this configuration, since the width W4 of the 2 nd groove 3a is equal to or less than the width W2 of the 1 st groove 4, the width of the 2 nd groove 3a can be suppressed from increasing. Accordingly, for example, it is possible to suppress: a situation in which the protective performance of the 1 st sidewall block 3 is lowered due to the presence of the 2 nd groove 3 a.

Further, as in the present embodiment, in the pneumatic tire 1, it is preferable that the 1 st side block 3 includes: a 1 st protrusion 3b disposed on a 1 st side D31 in the tire circumferential direction D3 with respect to the 2 nd groove 3a, and a 2 nd protrusion 3c disposed on a 2 nd side D32 in the tire circumferential direction D3 with respect to the 2 nd groove 3a, wherein a protrusion height H2 of the 2 nd protrusion 3c is lower than a protrusion height H1 of the 1 st protrusion 3 b.

According to this configuration, since the projection height H2 of the 2 nd projection 3c is lower than the projection height H1 of the 1 st projection 3b, the rubber thickness of the 2 nd projection 3c is thinner than the rubber thickness of the 1 st projection 3 b. Accordingly, it is possible to suppress: a situation in which the rubber weight becomes excessive because of the 1 st sidewall block 3.

In addition, as in the present embodiment, in the pneumatic tire 1, it is preferable that the area of the 1 st protruding portion 3b as viewed in the tire axial direction D1 is larger than the area of the 2 nd protruding portion 3c as viewed in the tire axial direction D1.

According to this configuration, in the 1 st sidewall block 3, the area of the 1 st protruding portion 3b having the high protruding height H1 becomes large. Accordingly, since the region of the 1 st protruding portion 3b having a large rubber thickness becomes large, for example, the protective effect of the 1 st sidewall block 3 can be improved.

The pneumatic tire 1 is not limited to the configuration of the above-described embodiment, and is not limited to the above-described operational effects. It goes without saying that the pneumatic tire 1 may be variously modified within a range not departing from the gist of the present invention. For example, it is needless to say that one or more of the configurations, methods, and the like according to various modifications described below may be arbitrarily selected and applied to the configurations, methods, and the like according to the above-described embodiments.

(1) The pneumatic tire 1 according to the above embodiment is configured such that: the 2 nd 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 such a configuration.

For example, the following configuration is possible: the 2 nd groove 3a is closed at the inner end in the tire radial direction D2 and is open at the outer end in the tire radial direction D2. Further, for example, the following may be configured: the 2 nd groove 3a is open at the inner end in the tire radial direction D2 and is also open at the outer end in the tire radial direction D2. Further, for example, the following may be configured: the 2 nd groove 3a is closed at the inner end in the tire radial direction D2, and is also closed at the outer end in the tire radial direction D2.

(2) In addition, the pneumatic tire 1 according to the above embodiment is configured such that: the sidewall block 3 includes a 2 nd groove 3a extending in the tire radial direction D2. However, the pneumatic tire 1 is not limited to such a configuration. For example, the following may be configured: the sidewall block 3 does not include: and a 2 nd groove 3a extending in the tire radial direction D2.

(3) In addition, the pneumatic tire 1 according to the above embodiment is configured such that: the width W4 of the 2 nd groove 3a is: the width W2 of the 1 st groove 4 is not more than. However, the pneumatic tire 1 is not limited to such a configuration. For example, the following may be configured: the width W4 of the 2 nd groove 3a is greater than the width W2 of the 1 st groove 4.

(4) In addition, in the pneumatic tire 1 according to the above embodiment, the configuration may be such that: the projection height H2 of the 2 nd projection 3c is lower than the projection height H1 of the 1 st projection 3 b. However, the pneumatic tire 1 is not limited to such a configuration. For example, the following configuration is possible: the projection height H2 of the 2 nd projection 3c is higher than the projection height H1 of the 1 st projection 3 b. Further, for example, the following may be configured: the projection height H2 of the 2 nd projection 3c is the same as the projection height H1 of the 1 st projection 3 b.

(5) In addition, the pneumatic tire 1 according to the above embodiment is configured such that: the area of the 1 st projection 3b as viewed in the tire axial direction D1 is larger than the area of the 2 nd projection 3c as viewed in the tire axial direction D1. However, the pneumatic tire 1 is not limited to such a configuration. For example, the following may be configured: the area of the 1 st projection 3b as viewed in the tire axial direction D1 is smaller than the area of the 2 nd projection 3c as viewed in the tire axial direction D1. Further, for example, the following may be configured: the area of the 1 st projection 3b as viewed in the tire axial direction D1 is the same as the area of the 2 nd projection 3c as viewed in the tire axial direction D1.

(6) In addition, the pneumatic tire 1 may be configured such that: the sidewall block 3 is provided only on one sidewall 12, and may be configured such that: the side portions 12 are provided on both sides. Although not particularly limited, for example, the following may be employed: the sidewall block 3 is provided at least in a sidewall portion 12 disposed on the outer side at the time of vehicle assembly, among the pair of sidewall portions 12.

Claims (10)

1. A pneumatic tire characterized in that a tire tread is formed,

the pneumatic tire is provided with: a side portion extending in a tire radial direction, and a tread portion having a tread surface on an outer side in the tire radial direction and connected to an outer end of the side portion in the tire radial direction,

the tread portion includes: a plurality of width grooves extending to outer ends in a tire axial 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 includes: a 1 st tread block and a 2 nd tread block adjacent in the tire circumferential direction,

the side wall portion includes: a plurality of sidewall blocks projecting in the tire axial direction and arranged in the tire circumferential direction,

the plurality of sidewall blocks comprising: a 1 st sidewall block and a 2 nd sidewall block adjacent in the tire circumferential direction,

the sidewall portion further includes: a 1 st groove disposed between the 1 st block and the 2 nd sidewall block,

the 1 st groove extends in the tire radial direction so as to divide the 1 st block and the 2 nd sidewall block over the entire length in the tire radial direction,

the 1 st sidewall block extends in the tire circumferential direction so as to intersect a 1 st tire meridian plane intersecting the 1 st tread block and intersect a 2 nd tire meridian plane intersecting the 2 nd tread block,

the width dimension of the 1 st groove is as follows: the 1 st sidewall block has a dimension in the tire circumferential direction of 5% or less.

2. A pneumatic tire according to claim 1,

the 1 st sidewall block includes, in an intermediate portion in the tire circumferential direction: a 2 nd groove extending in a radial direction of the tire,

the 2 nd groove is open at an inner end in the tire radial direction.

3. A pneumatic tire according to claim 2,

the width dimension of the 2 nd groove is as follows: the width of the 1 st groove is less than or equal to the width of the first groove.

4. A pneumatic tire according to claim 2 or 3,

the orientation of the 1 st groove inclined with respect to the tire radial direction is the same as the orientation of the 2 nd groove inclined with respect to the tire radial direction.

5. A pneumatic tire according to claim 2,

the 1 st sidewall block includes: a 1 st protrusion disposed on a 1 st side in the tire circumferential direction with respect to the 2 nd groove, and a 2 nd protrusion disposed on a 2 nd side in the tire circumferential direction with respect to the 2 nd groove,

the 2 nd protrusion has a protrusion height lower than that of the 1 st protrusion.

6. A pneumatic tire according to claim 4,

the 1 st protrusion has an area as viewed in the tire axial direction larger than an area of the 2 nd protrusion as viewed in the tire axial direction.

7. A pneumatic tire according to claim 5 or 6,

the 1 st sidewall block further includes: a linear protrusion extending in a linear shape,

the linear protrusion protrudes from the 1 st protruding portion.

8. A pneumatic tire according to claim 1,

the sidewall portion further includes: a 1 st width convex portion protruding from the 1 st tread block in the tire axial direction.

9. A pneumatic tire according to claim 8,

the sidewall portion further includes: a 2 nd widthwise convex portion projecting from the 2 nd tread block toward the tire axial direction.

10. A pneumatic tire according to claim 8 or 9,

the 1 st tread block includes: a width recess recessed toward the tire axial direction.

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