JP6740061B2 - Pneumatic tire - Google Patents

Description

The present invention relates to a pneumatic tire including a plurality of protrusions that protrude in the tire width direction.

BACKGROUND ART Conventionally, as a pneumatic tire, a pneumatic tire including a plurality of protruding portions protruding in the tire width direction is known (for example, Patent Document 1). According to such a configuration, due to the resistance when the projecting portion shears the mud and the friction between the projecting portion and the rock, the traction performance in the mud or the rocky area is improved, and the rubber thickness is increased, The scratch resistance is improved.

By the way, the weight balance in the tire tends to be uneven due to the presence of the protruding portion. As a result, for example, during tire production (vulcanization), the rubber does not flow smoothly and a chip (bare) occurs with respect to the desired tire shape, or, for example, when the vehicle is mounted, uniformity deteriorates. , It may cause vibration or noise of the vehicle.

JP, 2010-264962, A

Therefore, an object is to provide a pneumatic tire capable of suppressing uneven weight balance.

The pneumatic tire includes a sidewall portion extending in the tire radial direction, a tread portion having a tread surface on the outer side in the tire radial direction, and a tread portion connected to an outer end in the tire radial direction of the sidewall portion, and The tread portion includes a tread rubber arranged on the outer side in the tire radial direction, and at least one belt ply arranged on the inner side in the tire radial direction of the tread rubber, and the tread rubber is an outer side in the tire width direction. A plurality of grooves that extend to the end and a plurality of blocks that are divided into the plurality of grooves and that are arranged in parallel in the tire circumferential direction are provided, and the sidewall portion includes a plurality of protruding portions that protrude in the tire width direction. In the tire width direction view, the protrusion is arranged so that at least a part thereof overlaps one of the plurality of blocks in the tire radial direction, and at least one of the plurality of protrusions is at least one. Inner side of the at least one projecting portion arranged inside the tire radial direction with respect to the position of the outer end in the tire width direction of the belt ply arranged most inside the tire radial direction. A region and an outer region arranged on the outer side in the tire radial direction are divided into, and the sum of the opening areas of the openings in the inner region is larger than the sum of the opening areas of the openings in the outer region. ..

Further, in the pneumatic tire, in the ratio of the total opening area of the openings to the actual surface area of the protrusion, the ratio of the inner region is larger than the ratio of the outer region. Good.

Further, in the pneumatic tire, the depth of the opening in the inner region may be deeper than the depth of the opening in the outer region.

Further, in the pneumatic tire, the protrusion amount of the protrusion in the inner region may be larger than the protrusion amount of the protrusion in the outer region.

As described above, the pneumatic tire has an excellent effect that uneven weight balance can be suppressed.

FIG. 1 is a cross-sectional view of a main part of a pneumatic tire according to an embodiment in a tire meridian plane. FIG. 2 is a front view (a tire radial direction view) of a main part of the pneumatic tire according to the same embodiment. FIG. 3 is a side view (a tire width direction view) of a main part of the pneumatic tire according to the same embodiment. FIG. 4 is an enlarged cross-sectional view of a main part taken along line IV-IV of FIG. FIG. 5 is a main-portion cross-sectional view of the pneumatic tire according to the embodiment on the tire meridian surface, and is a diagram showing the shape when the vehicle comes into contact with the ground. FIG. 6 is a diagram showing a region having an opening area of an opening in the inner region according to the same embodiment. FIG. 7: is a figure which shows the area|region of the opening area of the opening part in the outer region which concerns on the same embodiment. FIG. 8: is a figure which shows the area|region of the actual surface area of the protrusion part in the inside area|region which concerns on the same embodiment. FIG. 9: is a figure which shows the area|region of the actual surface area of the protrusion part in the outer side area which concerns on the same embodiment. FIG. 10: is a figure which shows the protrusion part which concerns on other embodiment. FIG. 11: is a figure which shows the protrusion part which concerns on other embodiment. FIG. 12: is a figure which shows the protrusion part which concerns on other embodiment. FIG. 13: is a figure which shows the protrusion part which concerns on other embodiment.

Hereinafter, one embodiment of the pneumatic tire will be described with reference to FIGS. 1 to 9. In each of the drawings (also in FIGS. 10 to 13), the dimensional ratios of the drawings and the actual dimensional ratios do not always match, and the dimensional ratios of the drawings do not necessarily match. Absent.

As shown in FIG. 1, a pneumatic tire (hereinafter, also simply referred to as “tire”) 1 includes a pair of bead portions 11 having beads 11a. The tire 1 includes a sidewall portion 12 extending from each bead portion 11 to the outside in the tire radial direction D2, and a tread surface that is connected to the outer ends of the pair of sidewall portions 12 in the tire radial direction D2 and is in contact with the ground. And a tread portion 13 having 13a on the outer side in the tire radial direction D2. The tire 1 is mounted on a rim (not shown).

Further, the tire 1 includes a carcass layer 14 spanned between the pair of beads 11a and 11a, and an inner liner 15 disposed inside the carcass layer 14 and facing the internal space of the tire 1 filled with air. I have it. The carcass layer 14 and the inner liner 15 are arranged along the tire inner circumference over the bead portion 11, the sidewall portion 12, and the tread portion 13.

In FIG. 1 (the same applies to the following figures), a first direction D1 is a tire width direction D1 that is parallel to the tire rotation axis, and a second direction D2 is a tire radial direction D2 that is a diametrical direction of the tire 1. The third direction D3 (see, for example, FIGS. 2 and 3) is the tire circumferential direction D3 that is the direction around the tire rotation axis. One side D2a of the second direction D2 is an inner side in the tire radial direction D2, and the other direction side D2b is an outer side in the tire radial direction D2. The tire equatorial plane S1 is a plane orthogonal to the tire rotation axis and located at the center in the tire width direction D1, and the tire meridian plane is a plane including the tire rotation axis and orthogonal to the tire equatorial plane S1. Is a face.

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

The bead portion 11 includes a rim strip rubber 11d arranged outside the carcass layer 14 in the tire width direction D1 so as to form an outer surface that contacts the rim. The sidewall portion 12 includes a sidewall rubber 12a arranged outside the carcass layer 14 in the tire width direction D1 so as to form an outer surface.

The tread portion 13 includes a tread rubber 13b forming a tread surface 13a and a belt portion 13c arranged between the tread rubber 13b and the carcass layer 14. The belt portion 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 or metal) arranged in parallel, and a topping rubber that covers the belt cords.

The carcass layer 14 is composed of at least one (two in FIG. 1) carcass plies 14a. The carcass ply 14a is folded back around the bead 11a so as to wind the bead 11a. The carcass ply 14a includes a plurality of ply cords (for example, organic fibers or metal) arranged in a direction substantially orthogonal to the tire circumferential direction D3, and a topping rubber that covers the ply cords.

The inner liner 15 has an excellent function of blocking the permeation of gas in order to hold the air pressure. In the sidewall portion 12, the inner liner 15 is in close contact with the inner peripheral side of the carcass layer 14, and no other member is interposed between the inner liner 15 and the carcass layer 14.

For example, in the distance between the carcass ply 14a arranged on the innermost side and the tire inner peripheral surface (inner peripheral surface of the inner liner 15), the distance of the sidewall portion 12 is equal to that of the tread portion 13. 90% to 180%. More specifically, the distance of the sidewall portion 12 is 120% to 160% of the distance of the tread portion 13.

The sidewall portion 12 is the same in the tire radial direction D2 as in the tire maximum width position (specifically, in the distance between the outer sides of the carcass layer 14 in the tire width direction D1 that is the maximum distance). Is provided on the outer surface. Hereinafter, the position 12b is referred to as the tire maximum width position 12b.

In addition, the sidewall portion 12 has a position 12c on the outer surface that is the same as the outer end 11e of the bead filler 11c in the tire radial direction D2 in the tire radial direction D2. Hereinafter, the position 12c is referred to as the bead filler outer end position 12c.

Further, the sidewall portion 12 is the same in the tire radial direction D2 as the outer end 13e in the tire width direction D1 of the belt ply 13d that is arranged on the innermost side in the tire radial direction D2 among the plurality of belt plies 13d. The outer surface is provided with the position 12d. Hereinafter, the position 12d will be referred to as a belt end position 12d.

As shown in FIGS. 2 to 4, the tread portion 13 is divided into a plurality of grooves 2 that extend to the outer end in the tire width direction D1 and a plurality of grooves 2, so that the tread portions 13 are arranged in parallel in the tire circumferential direction D3. Block 3 of FIG. In addition, the sidewall portion 12 has a plurality of protruding portions 4 protruding from the profile surface (reference surface) S2 in the tire width direction D1, and an annular shape protruding from the profile surface S2 in the tire width direction D1 and extending along the tire circumferential direction D3. And a protrusion 5.

The protruding portion 4 is arranged at least outside the sidewall portion 12 in the tire radial direction D2. As a result, the projecting portion 4 can be grounded in a state where the tire 1 sinks due to the weight of the vehicle and is buried in mud or sand in a muddy land or sandy land, or can be landed on an uneven rock in a rocky area. That is, the protruding portion 4 is grounded on a bad road such as a muddy land, a sandy land, or a rocky area. The protrusion 4 does not touch the ground during normal traveling on a flat road.

In addition, the protruding portion 4 is arranged outside the bead filler outer end position 12c (see FIG. 1) of the sidewall portion 12 in the tire radial direction D2. Specifically, the protruding portion 4 is arranged outside the tire maximum width position 12b (see FIG. 1) of the sidewall portion 12 in the tire radial direction D2.

The protruding portion 4 is arranged such that at least a part thereof overlaps with one of the plurality of blocks 3 in the tire radial direction D2 when viewed in the tire width direction D1. That is, the protrusion 4 overlaps only one block 3 in the tire radial direction D2 when viewed in the tire width direction D1. Then, for example, in the tire width direction D1 view, the protruding portion 4 is in the tire radial direction D2 in a range of 25% or more (preferably 50% or more, more preferably 75% or more) of the block 3 and the tire circumferential direction D3. overlapping.

The outer end 4a of the protrusion 4 in the tire radial direction D2 is inside the tread surface 13a of the block 3 in the tire radial direction D2. Thus, the tread surface 13a of the block 3 and the outer end 4a of the protrusion 4 in the tire radial direction D2 form an uneven shape.

By the way, due to the presence of the uneven shape, surface and edge components are formed. The uneven shape is formed in the portion that contacts the mud, sand, and rocks, which increases the area of contact with the mud, sand, and rocks. It may be easier to touch the mud, sand, or rock at the location. In this way, the uneven shape is formed in the portion contacting the mud, sand, or rock, so that the traction performance is improved.

The protrusion 4 has openings 6 and 7. As a result, the weight increases due to the presence of the protruding portion 4, while the openings 6 and 7 suppress the increase in weight, so that the uneven weight balance due to the presence of the protruding portion 4 is suppressed. Further, the presence of the openings 6 and 7 increases the components of the surface and the edges, and thus improves the traction performance. The first and second openings 6 and 7 are each formed in a quadrangular shape when viewed in the tire width direction D1.

The openings 6 and 7 are arranged apart from both edges of the protrusion 4 in the tire radial direction D2. Further, the openings 6 and 7 are arranged apart from both end edges of the protrusion 4 in the tire circumferential direction D3. As a result, the rigidity of the protrusion 4 around the openings 6 and 7 can be increased, so that the traction performance of the protrusion 4 can be maintained. For example, the width dimension between the opening edges of the openings 6 and 7 and the end edge of the protrusion 4 is 1.5 mm or more (preferably 2.0 mm or more).

The openings 6 and 7 are arranged so as to include the center of the protrusion 4 in the tire circumferential direction D3. Specifically, the center position of the openings 6, 7 in the tire circumferential direction D3 coincides with the center position of the protrusion 4 in the tire circumferential direction D3. The openings 6 and 7 are line-symmetrical with respect to the center of the protrusion 4 in the tire circumferential direction D3. Accordingly, in the tire circumferential direction D3, it is possible to prevent the weight balance from becoming non-uniform, so that it is possible to prevent the uniformity when the vehicle is mounted from decreasing.

The protruding portion 4 is divided into an inner region 4b arranged inside the tire radial direction D2 and an outer region 4c arranged outside the tire radial direction D2 with respect to the belt end position 12d. In the present embodiment, since the belt end position 12d is the same position as the annular protruding portion 5, the inner region 4b is arranged inside the annular protruding portion 5 in the tire radial direction D2 and the outer region 4c. Is arranged on the outer side in the tire radial direction D2 with respect to the annular protrusion 5.

Further, the protrusion 4 has two openings 6 and 7. Specifically, the protrusion 4 has a first opening 6 arranged inside the tire radial direction D2 and a second opening 7 arranged outside the tire radial direction D2. The first opening 6 is arranged inside the annular protrusion 5 in the tire radial direction D2, and the second opening 7 is arranged outside the annular protrusion 5 in the tire radial direction D2. There is. That is, the first opening 6 is arranged in the inner region 4b, and the second opening 7 is arranged in the outer region 4c.

By the way, as shown in FIG. 5, when the tire 1 mounted on the vehicle is in contact with the ground 20, the tire 1 is deformed due to the weight of the vehicle and the like. In FIG. 5, the two-dot chain line shows the shape before deformation, and the solid line shows the shape after deformation. At this time, the tire 1 generally deforms differently based on the belt end position 12d.

Specifically, the inner region 4b is deformed so as to face the side as indicated by the solid arrow, while the outer region 4c is deformed so as to face the ground 20 as indicated by the dashed arrow. Therefore, the first opening 6 of the inner region 4b advantageously acts on, for example, traction at the time of contact with a rock standing from the ground 20.

Therefore, in the projecting portion 4 having the openings 6 and 7, as shown in FIGS. 6 and 7, the sum A1 of the opening areas of the first openings 6 in the inner area 4b (hatched areas in FIG. 6) is The total area A2 of the second openings 7 in the outer area 4c (hatched area in FIG. 7) is larger than the sum A2. This makes it easier for the rock to come into contact with the surface or edge of the first opening 6, so that friction easily occurs between the first opening 6 and the rock. Therefore, the traction performance on a rocky place can be improved.

Further, as shown in FIGS. 6 to 9, the ratio (A1/) of the sum A1 of the opening areas of the first openings 6 to the actual surface area (hatched area of FIG. 8) A3 of the protrusions 4 in the inner area 4b. A3) is larger than the ratio (A2/A4) of the total area A2 of the opening areas of the second openings 7 to the actual surface area (hatched area of FIG. 9) A4 of the protrusions 4 in the outer area 4c. There is. This makes it easier for the rock to come into contact with the surface or edge of the first opening 6, so that friction is more likely to occur between the first opening 6 and the rock. Therefore, the traction performance on a rocky place can be improved.

Returning to FIG. 4, the depth (maximum depth) of the first opening 6 in the inner region 4b is deeper than the depth (maximum depth) of the second opening 7 in the outer region 4c. As a result, the surface of the first opening 6 becomes large, so that the frictional force between the first opening 6 and the rock becomes large. Therefore, the traction performance on a rocky place can be improved.

Further, the protrusion amount (maximum protrusion amount) of the protrusion 4 in the inner region 4b is larger than the protrusion amount (maximum protrusion amount) of the protrusion 4 in the outer region 4c. Thereby, although the opening area of the first opening 6 is large and the depth of the first opening 6 is deep, the rubber volume of the inner region 4b is secured. Therefore, it is possible to suppress the deterioration of the external damage resistance of the inner region 4b.

As described above, the pneumatic tire 1 according to the present embodiment has the sidewall portion 12 extending in the tire radial direction D2 and the tread surface 13a on the outer side in the tire radial direction D2, and the sidewall portion 12 has the tire radial direction D2. And a tread portion 13 connected to the outer end of the tread rubber 13b. The tread portion 13 is disposed on the outer side in the tire radial direction D2 and the tread rubber 13b is disposed on the inner side in the tire radial direction D2. At least one belt ply 13d, and the tread rubber 13b is divided into a plurality of grooves 2 extending to the outer end in the tire width direction D1 and a plurality of the grooves 2 so that the tread rubber 13b extends in the tire circumferential direction D3. A plurality of blocks 3 that are arranged in parallel, the sidewall portion 12 includes a plurality of protrusions 4 that protrude in the tire width direction D1, and the protrusions 4 are at least partially viewed in the tire width direction D1. Are arranged so as to overlap one of the plurality of blocks 3 in the tire radial direction D2, and at least one of the plurality of protrusions 4 includes at least one opening 6 and 7, and the at least one protrusion The portion 4 includes an inner region 4b arranged on the inner side in the tire radial direction D2 with respect to a position of an outer end 13e of the belt ply 13d arranged on the innermost side in the tire radial direction D2 in the tire width direction D1, and a tire. The total area A1 of the opening areas of the openings 6 in the inner area 4b is divided into the outer area 4c arranged on the outer side in the radial direction D2 and the total area A2 of the opening areas of the openings 7 in the outer area 4c. Bigger than

According to such a configuration, the protruding portion 4 is arranged such that at least a part thereof overlaps one of the plurality of blocks 3 in the tire radial direction D2 when viewed in the tire width direction D1. Therefore, the traction performance is exhibited by the positional relationship (for example, the uneven shape) between the block 3 and the protruding portion 4 in the tire width direction D1.

In addition, the presence of the protruding portion 4 increases the weight of rubber in that portion. Therefore, at least one of the plurality of protrusions 4 has openings 6 and 7. As a result, it is possible to suppress uneven weight balance due to the presence of the protrusions 4. Moreover, traction performance is exhibited by the surfaces and edges of the openings 6 and 7.

By the way, in the sidewall portion 12, generally, the inner side in the tire radial direction D2 is based on the position of the outer end 13e in the tire width direction D1 of the belt ply 13d that is arranged most inside in the tire radial direction D2. The inner region 4b is deformed so as to face the side. Therefore, the sum A1 of the opening areas of the openings 6 in the inner region 4b is larger than the sum A2 of the opening areas of the openings 7 in the outer region 4c.

Thereby, for example, the rock easily contacts the surface or the edge of the opening 6 in the inner region 4b, and thus friction is easily generated between the opening 6 and the rock. Therefore, for example, it is possible to efficiently improve the traction performance particularly in a rocky area.

Further, in the pneumatic tire 1 according to the present embodiment, in the ratio of the sum A1 and A2 of the opening areas of the openings 6 and 7 to the actual surface areas A3 and A4 of the protrusions 4, the inner area 4b of The ratio (A1/A3) is larger than the ratio (A2/A4) of the outer region 4c.

According to such a configuration, in the ratio of the total area A1, A2 of the opening areas of the openings 6, 7 to the actual surface areas A3, A4 of the protruding portion 4, the ratio (A1/A3) of the inner area 4b is the outer area. Since the ratio is larger than the ratio (A2/A4) of 4c, it becomes easy for the rock to come into contact with the surface or the edge of the opening 6 of the inner region 4b, for example. Thereby, for example, friction is more likely to occur between the opening 6 of the inner region 4b and the rock, so that the traction performance in the rocky area can be further effectively improved.

Further, in the pneumatic tire 1 according to the present embodiment, the depth of the opening 6 in the inner region 4b is deeper than the depth of the opening 7 in the outer region 4c.

According to such a configuration, the depth of the opening 6 in the inner region 4b is deeper than the depth of the opening 7 in the outer region 4c, so that the surface of the opening 6 in the inner region 4b becomes large. As a result, for example, the frictional force between the opening 6 of the inner region 4b and the rock becomes large, so that the traction performance in the rocky area can be improved more efficiently.

Further, in the pneumatic tire 1 according to the present embodiment, the protrusion amount of the protrusion 4 in the inner region 4b is larger than the protrusion amount of the protrusion 4 in the outer region 4c.

According to such a configuration, since the protrusion amount of the protrusion 4 in the inner region 4b is larger than the protrusion amount of the protrusion 4 in the outer region 4c, it is possible to reduce the rubber volume of the inner region 4b, for example. Can be suppressed. Thereby, for example, it is possible to suppress the deterioration of the external damage resistance of the inner region 4b.

In addition, the pneumatic tire is not limited to the configuration of the above-described embodiment and is not limited to the above-described operational effects. Needless to say, the pneumatic tire can be variously modified without departing from the scope of the present invention. For example, it is needless to say that one or a plurality of configurations and methods according to various modifications described below may be arbitrarily selected and used for the configurations and methods according to the above-described embodiments.

In the pneumatic tire 1 according to the above-described embodiment, in the ratio of the sum A1, A2 of the opening areas of the openings 6, 7 to the actual surface areas A3, A4 of the protrusions 4, the ratio of the inner area 4b (A1/A3). ) Is larger than the ratio (A2/A4) of the outer region 4c. However, the pneumatic tire is not limited to such a configuration. For example, the ratio (A1/A3) of the inner region 4b may be smaller than the ratio (A2/A4) of the outer region 4c. Further, for example, the ratio (A1/A3) of the inner region 4b may be the same as the ratio (A2/A4) of the outer region 4c.

In the pneumatic tire 1 according to the above embodiment, the depth of the opening 6 in the inner region 4b is deeper than the depth of the opening 7 in the outer region 4c. However, the pneumatic tire is not limited to such a configuration. For example, the depth of the opening 6 in the inner region 4b may be shallower than the depth of the opening 7 in the outer region 4c. Further, for example, the depth of the opening 6 in the inner region 4b may be the same as the depth of the opening 7 in the outer region 4c.

Further, in the pneumatic tire 1 according to the above embodiment, the protrusion amount of the protrusion 4 in the inner region 4b is larger than the protrusion amount of the protrusion 4 in the outer region 4c. However, the pneumatic tire is not limited to such a configuration. For example, the protrusion amount of the protrusion 4 in the inner region 4b may be smaller than the protrusion amount of the protrusion 4 in the outer region 4c. Further, for example, the protrusion amount of the protrusion 4 in the inner region 4b may be the same as the protrusion amount of the protrusion 4 in the outer region 4c.

Further, in the pneumatic tire 1 according to the above-described embodiment, two openings 6 and 7 are provided for one protrusion 4. However, the pneumatic tire is not limited to such a configuration. For example, one opening or three or more openings may be provided for one protrusion 4.

For example, as shown in FIG. 10, one opening 8 may be provided for each protrusion 4. In addition, for example, as shown in FIG. 11, a configuration may be adopted in which three openings 8 are provided for one protrusion 4. Further, for example, as shown in FIG. 12, a configuration may be adopted in which five openings 8 are provided for one protrusion 4.

Further, in the pneumatic tire 1 according to the above embodiment, the openings 6 and 7 are formed in a quadrangular shape when viewed in the tire width direction D1. However, the pneumatic tire is not limited to such a configuration. For example, as shown in FIG. 10, the opening 8 may be formed in a polygonal shape of a pentagon or more when viewed in the tire width direction D1. Further, for example, as shown in FIG. 12, the opening 8 may be formed in a circular shape (a perfect circular shape or an elliptical shape) when viewed in the tire width direction D1. Further, for example, as shown in FIG. 13, the opening 8 may have a triangular shape when viewed in the tire width direction D1.

Further, in the pneumatic tire 1 according to the above-described embodiment, the openings 6 and 7 are provided in all the protrusions 4. However, the pneumatic tire is not limited to such a configuration. For example, the openings 6 and 7 may be provided in at least one of the plurality of protrusions 4. The openings 6, 7 are preferably provided in at least ¼ of the plurality of protrusions 4, more preferably in at least ⅓, and at least ½. It is more preferable that the structure is

In addition, in the pneumatic tire 1 according to the above-described embodiment, the protrusions 4 have the same shape, and the openings 6 and 7 have the same shape. However, the pneumatic tire is not limited to such a configuration. For example, the protrusion 4 may have a plurality of different shapes, and the protrusions 4 may be sequentially arranged in the tire circumferential direction D3. Further, for example, the openings 6 and 7 may have a plurality of different shapes, and the openings 4 and 7 may be arranged on the respective protrusions 4 in order in the tire circumferential direction D3.

Further, in the pneumatic tire 1 according to the above-described embodiment, the openings 6 and 7 are arranged apart from both end edges of the protrusion 4 in the tire radial direction D2. However, the pneumatic tire is not limited to such a configuration. For example, the openings 6 and 7 may be arranged apart from only one edge of the protrusion 4 in the tire radial direction D2.

Further, in the pneumatic tire 1 according to the above-described embodiment, the openings 6 and 7 are arranged separately from both edges of the protrusion 4 in the tire circumferential direction D3. However, the pneumatic tire is not limited to such a configuration. For example, the openings 6 and 7 may be arranged apart from only one end edge of the protrusion 4 in the tire circumferential direction D3.

Further, in the pneumatic tire 1 according to the above-described embodiment, the protrusion 4 is provided on both of the pair of sidewall portions 12. However, the pneumatic tire is not limited to such a configuration. For example, the protrusion 4 may be provided on one of the pair of sidewall portions 12. For example, the protruding portion 4 may be provided at least in the sidewall portion 12 of the pair of sidewall portions 12 which is arranged outside when the vehicle is mounted.

Further, in the pneumatic tire 1, in contrast to the configuration in which the protrusion 4 is provided on both of the pair of sidewall portions 12, the openings 6 and 7 have the protrusion 4 of the sidewall portion 12 on one side. It may be configured to be provided only in the above, or may be provided in the protruding portions 4 of both sidewall portions 12. For example, the openings 6 and 7 may be provided at least in the protruding portion 4 of the sidewall portion 12 of the pair of sidewall portions 12 which is arranged outside when the vehicle is mounted.

DESCRIPTION OF SYMBOLS 1... Pneumatic tire, 2... Groove, 3... Block, 4... Projection part, 4a... Outer end, 4b... Inner area, 4c... Outer area, 5... Annular protrusion part, 6... 1st opening part, 7... 2 openings, 8... openings, 11...beads, 11a...beads, 11b...bead cores, 11c...bead fillers, 11d...rim strip rubber, 11e...outer ends, 12...sidewalls, 12a...sidewalls, 12b... tire maximum width position, 12c... bead filler outer end position, 12d... belt end position, 13... tread portion, 13a... tread surface, 13b... tread rubber, 13c... belt portion, 13d... belt ply, 13e... outer end , 14... Carcass layer, 14a... Carcass ply, 15... Inner liner, 20... Ground, D1... Tire width direction, D2... Tire radial direction, D2a... Tire radial inside, D2b... Tire radial outside Side, D3... tire circumferential direction, S1... tire equatorial plane, S2... profile plane

Claims (4)

A sidewall portion extending in the tire radial direction,
Having a tread surface on the outer side in the tire radial direction, and a tread portion connected to an outer end of the sidewall portion in the tire radial direction,
The tread portion includes a tread rubber arranged on the outer side in the tire radial direction, and at least one belt ply arranged on the inner side in the tire radial direction of the tread rubber,
The tread rubber includes a plurality of grooves extending to the outer end in the tire width direction, and a plurality of blocks arranged in the tire circumferential direction by being divided into the plurality of grooves,
The sidewall portion includes a plurality of protruding portions protruding in the tire width direction,
The protruding portion is arranged so that at least a part thereof overlaps with one of the plurality of blocks in the tire radial direction in a tire width direction view,
At least one of the plurality of protrusions comprises at least one opening,
The at least one projecting portion is an inner region disposed on the inner side in the tire radial direction with respect to a position of an outer end in the tire width direction of the belt ply disposed on the innermost side in the tire radial direction, and a tire radial direction. It is divided into an outer area, which is located outside the
The pneumatic tire, wherein the total opening area of the openings in the inner region is larger than the total opening area of the openings in the outer region. The pneumatic tire according to claim 1, wherein the ratio of the total opening area of the openings to the actual surface area of the protrusions is greater in the inner region than in the outer region. The pneumatic tire according to claim 1 or 2, wherein the depth of the opening in the inner region is deeper than the depth of the opening in the outer region. The pneumatic tire according to any one of claims 1 to 3, wherein a protrusion amount of the protrusion in the inner area is larger than a protrusion amount of the protrusion in the outer area.

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