JP2018039366A - Pneumatic tire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pneumatic tire that can suppress unbalance in weight.SOLUTION: In the pneumatic tire, at least one of a plurality of protruding parts comprises at least one opening part. The at least one protruding part is divided into an inner region which is arranged inside in a tire radial direction and an outer region which is arranged outside in the tire radial direction, with respect to a position at an outer end in a tires width direction of a belt ply arranged innermost in the tire radial direction, where the sum of opening areas of the opening part in the inner region is larger than the sum of opening areas of the opening part in the outer region.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a pneumatic tire including a plurality of protruding portions protruding in the tire width direction.

  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 protrusions shear mud and the friction between the protrusions and the rock, the traction performance in the muddy area and the rocky place is improved, and the increase in the rubber thickness Improved trauma resistance.

  By the way, due to the presence of the protruding portion, the weight balance in the tire tends to be uneven. As a result, for example, during tire manufacture (vulcanization), rubber does not flow smoothly, chipping (bearing) occurs in the desired tire shape, and uniformity is reduced, for example, when the vehicle is mounted. This may cause vehicle vibration and noise.

JP 2010-264962 A

  Then, a subject is providing the pneumatic tire which can suppress the nonuniformity of a weight balance.

  The pneumatic tire includes a sidewall 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 in the tire radial direction of the sidewall portion, The tread portion includes a tread rubber disposed on the outer side in the tire radial direction, and at least one belt ply disposed on the inner side in the tire radial direction of the tread rubber, and the tread rubber is disposed on the outer side in the tire width direction. A plurality of grooves extending to an end; and a plurality of blocks arranged in parallel in the tire circumferential direction by being partitioned into the plurality of grooves, wherein the sidewall portion protrudes in the tire width direction. The protrusion is disposed so that at least a portion thereof overlaps one of the plurality of blocks in the tire radial direction when viewed in the tire width direction. At least one of the projecting portions includes at least one opening, and the at least one projecting portion is located with respect to a position of an outer end in the tire width direction of the belt ply arranged at an innermost position in the tire radial direction. , The inner region disposed inside the tire radial direction and the outer region disposed outside the tire radial direction, the sum of the opening areas of the openings in the inner region is the It is larger than the sum of the opening areas of the openings.

  In the pneumatic tire, in the ratio of the sum of the opening area of the opening to the actual surface area of the protrusion, the ratio of the inner area is larger than the ratio of the outer area. Good.

  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.

  In the pneumatic tire, the protruding amount of the protruding portion in the inner region may be larger than the protruding amount of the protruding portion in the outer region.

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

Drawing 1 is an important section sectional view in the tire meridian surface of the pneumatic tire concerning one embodiment. FIG. 2 is a front view (a view in the tire radial direction) of the main part of the pneumatic tire according to the embodiment. FIG. 3 is a side view (view in the tire width direction) of the main part of the pneumatic tire according to the embodiment. 4 is an enlarged cross-sectional view of a main part taken along the line IV-IV in FIG. FIG. 5 is a cross-sectional view of a main part of the pneumatic tire according to the embodiment on the meridian surface of the tire, and is a diagram illustrating a shape when grounded. FIG. 6 is a diagram showing a region of the opening area of the opening in the inner region according to the embodiment. FIG. 7 is a view showing a region of the opening area of the opening in the outer region according to the embodiment. FIG. 8 is a diagram showing a region of the actual surface area of the protruding portion in the inner region according to the embodiment. FIG. 9 is a diagram showing a region of the actual surface area of the protruding portion in the outer region according to the embodiment. FIG. 10 is a diagram illustrating a protrusion according to another embodiment. FIG. 11 is a diagram illustrating a protrusion according to still another embodiment. FIG. 12 is a diagram illustrating a protrusion according to still another embodiment. FIG. 13 is a diagram illustrating a protrusion according to still another embodiment.

  Hereinafter, an embodiment of a pneumatic tire will be described with reference to FIGS. In each figure (the same applies to FIGS. 10 to 13), the dimensional ratio in the drawing does not necessarily match the actual dimensional ratio, and the dimensional ratio between the drawings does 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 that extends outward from each bead portion 11 in the tire radial direction D2, and a tread surface that is connected to the outer end of each 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. The carcass layer 14 and the inner liner 15 are disposed along the tire inner periphery over the bead portion 11, the sidewall portion 12, and the tread portion 13.

  In FIG. 1 (the same applies to the following drawings), the first direction D1 is a tire width direction D1 parallel to the tire rotation axis, and the second direction D2 is a tire radial direction D2 that is the diameter direction of the tire 1. The third direction D3 (see, for example, FIGS. 2 and 3) is a tire circumferential direction D3 that is a direction around the tire rotation axis. In addition, the one direction side D2a of the second direction D2 is the inner side of the tire radial direction D2, and the other direction side D2b is the outer side of the tire radial direction D2. The tire equatorial plane S1 is a plane orthogonal to the tire rotation axis and located in the center of 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. Surface.

  The bead 11a includes a bead core 11b formed in an annular shape and a bead filler 11c disposed outside the bead core 11b in the tire radial direction D2. For example, the bead core 11b is formed by laminating rubber-coated bead wires (for example, metal wires), 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 disposed 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 12 a that is disposed outside the carcass layer 14 in the tire width direction D <b> 1 so as to form an outer surface.

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

  The carcass layer 14 is composed of at least one (two in FIG. 1) carcass plies 14a. The carcass ply 14a is folded 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 and metals) 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 is excellent in the function of blocking gas permeation in order to maintain 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 peripheral side and the tire inner peripheral surface (the inner peripheral surface of the inner liner 15), the distance of the sidewall portion 12 is equal to the distance 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.

  Note that the sidewall portion 12 is the same in the tire radial direction D2 and the position where the tire has the maximum width (specifically, the position which becomes the maximum distance among the distances between the outer sides of the tire width direction D1 of the carcass layer 14). A position 12b is provided on the outer surface. Hereinafter, the position 12b is referred to as a tire maximum width position 12b.

  Further, the sidewall portion 12 includes 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 a 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 in the belt ply 13d that is disposed most inside the tire radial direction D2 among the plurality of belt plies 13d. The position 12d is provided on the outer surface. Hereinafter, the position 12d is 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 extending to the outer end in the tire width direction D <b> 1 and a plurality of grooves 2, so that a plurality of tread portions 13 are arranged in parallel in the tire circumferential direction D <b> 3. The block 3 is provided. 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 disposed at least outside the sidewall portion 12 in the tire radial direction D2. Thereby, the protrusion 4 can be grounded in a state where the tire 1 sinks due to the weight of the vehicle in a mud or sand and is buried in the mud or sand, or can be grounded on an uneven rock in a rocky place. That is, the protrusion 4 is grounded on rough roads such as muddy ground, sandy land, and rocky ground. Note that the protruding portion 4 is not grounded during normal driving on a flat road.

  Moreover, the protrusion part 4 is arrange | positioned rather than the bead filler outer side edge position 12c (refer FIG. 1) of the sidewall part 12 in the tire radial direction D2. Specifically, the protruding portion 4 is disposed outside the tire radial direction D2 with respect to the tire maximum width position 12b of the sidewall portion 12 (see FIG. 1).

  The protrusion 4 is disposed so that at least a portion thereof overlaps 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 with only one block 3 in the tire radial direction D2 when viewed in the tire width direction D1. For example, the protrusion 4 is 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 in the tire radial direction D2 when viewed in the tire width direction D1. overlapping.

  The outer end 4a of the protruding portion 4 in the tire radial direction D2 is on the inner side of the tire radial direction D2 than the tread surface 13a of the block 3. Accordingly, an uneven shape is formed by the tread surface 13a of the block 3 and the outer end 4a of the protruding portion 4 in the tire radial direction D2.

  By the way, the presence of the concavo-convex shape forms surface and edge components. In addition, by forming uneven shapes in the part that contacts the mud, sand, and rock, the area that contacts the mud, sand, and rock increases, 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. In this way, ruggedness is formed in the portion that contacts mud, sand, and rock, thereby improving traction performance.

  The protrusion 4 includes openings 6 and 7. Thereby, while the weight increases due to the presence of the protruding portion 4, the openings 6 and 7 suppress the increase in weight, and thus the unevenness of the weight balance due to the presence of the protruding portion 4 is suppressed. Further, the presence of the openings 6 and 7 increases the surface and edge components, thereby improving the traction performance. In addition, the 1st and 2nd opening parts 6 and 7 are each formed in square shape by tire width direction D1 view.

  The openings 6 and 7 are arranged away from both end edges of the protrusion 4 in the tire radial direction D2. Furthermore, the openings 6 and 7 are arranged away from both end edges of the protrusion 4 in the tire circumferential direction D3. Thereby, since the rigidity around the openings 6 and 7 of the protrusion 4 can be increased, the traction performance by the protrusion 4 can be maintained. For example, the width dimension between the opening edge of the opening parts 6 and 7 and the end edge of the protrusion part 4 is 1.5 mm or more (preferably 2.0 mm or more).

  Moreover, the opening parts 6 and 7 are arrange | positioned so that the center of the tire peripheral direction D3 of the protrusion part 4 may be included. Specifically, the center position of the openings 6 and 7 in the tire circumferential direction D3 coincides with the center position of the protrusion 4 in the tire circumferential direction D3. And the opening parts 6 and 7 become a line symmetrical shape with respect to the center of the tire circumferential direction D3 of the protrusion part 4. As shown in FIG. Thereby, in tire peripheral direction D3, since it suppresses that a weight balance becomes non-uniform | heterogenous, it can suppress that the uniformity at the time of vehicle mounting | wearing falls.

  The protrusion 4 is divided into an inner region 4b disposed inside the tire radial direction D2 and an outer region 4c disposed 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 protrusion 5, the inner region 4b is disposed more inside the tire radial direction D2 than the annular protrusion 5, and the outer region 4c. Is arranged outside the annular protrusion 5 in the tire radial direction D2.

  Further, the protruding portion 4 includes two openings 6 and 7. Specifically, the protrusion 4 includes a first opening 6 disposed inside the tire radial direction D2 and a second opening 7 disposed outside the tire radial direction D2. The first opening 6 is disposed on the inner side in the tire radial direction D2 with respect to the annular protrusion 5, and the second opening 7 is disposed on the outer side in the tire radial direction D2 with respect to the annular protrusion 5. Yes. In other words, the first opening 6 is disposed in the inner region 4b, and the second opening 7 is disposed in the outer region 4c.

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

  Specifically, the inner region 4b is deformed so as to face sideward as indicated by a solid arrow, while the outer region 4c is deformed so as to face the ground 20 as indicated by a broken arrow. Therefore, the 1st opening part 6 of the inner side area | region 4b acts on the traction at the time of earth | grounding with the rock standing from the ground 20, for example.

  Therefore, in the protruding portion 4 having the openings 6 and 7, as shown in FIGS. 6 and 7, the total sum A1 of the opening area of the first opening 6 (shaded area in FIG. 6) in the inner region 4b is The total area A2 of the opening area of the second opening 7 in the outer region 4c (the shaded region in FIG. 7) is larger. As a result, the rock easily comes into contact with the surface or edge of the first opening 6, so that friction is easily generated between the first opening 6 and the rock. Therefore, the traction performance at the rocky place can be improved.

  Further, as shown in FIGS. 6 to 9, the ratio (A1 / A1) of the total opening area A1 of the first opening 6 to the actual surface area (shaded area in FIG. 8) A3 of the protrusion 4 in the inner region 4b. A3) is larger than the ratio (A2 / A4) of the sum A2 of the opening area of the second opening 7 to the actual surface area (shaded area in FIG. 9) A4 of the protrusion 4 in the outer region 4c. Yes. 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 at the 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. Thereby, since the surface of the 1st opening part 6 becomes large, the frictional force of the 1st opening part 6 and a rock becomes large. Therefore, the traction performance at the rocky place can be improved.

  Further, the protruding amount (maximum protruding amount) of the protruding portion 4 in the inner region 4b is larger than the protruding amount (maximum protruding amount) of the protruding portion 4 in the outer region 4c. Thereby, although the opening area of the 1st opening part 6 is large and the depth of the 1st opening part 6 is deep, the rubber volume of the inner side area | region 4b is ensured. Accordingly, it is possible to suppress a decrease in the damage resistance performance 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 outside the tire radial direction D2, and the tire radial direction D2 of the sidewall portion 12 is included. A tread portion 13 connected to the outer end of the tread portion 13, and the tread portion 13 is disposed inside the tire radial direction D2 of the tread rubber 13b and the tread rubber 13b. At least one belt ply 13d, and the tread rubber 13b is partitioned into the plurality of grooves 2 extending to the outer end in the tire width direction D1 and the plurality of grooves 2, thereby the tire circumferential direction D3. A plurality of blocks 3 arranged in parallel, and the sidewall portion 12 includes a plurality of projecting portions 4 projecting in a tire width direction D1, and the projecting portions Is arranged so that at least a portion thereof overlaps one of the plurality of blocks 3 in the tire radial direction D2 when viewed in the tire width direction D1, and at least one of the plurality of protrusions 4 has at least one opening. The at least one projecting portion 4 is provided in the tire radial direction D2 with respect to the position of the outer end 13e in the tire width direction D1 of the belt ply 13d disposed at the innermost side in the tire radial direction D2. Is divided into an inner region 4b disposed on the inner side of the tire and an outer region 4c disposed on the outer side in the tire radial direction D2, and the sum A1 of the opening area of the opening 6 in the inner region 4b is the outer region. It is larger than the sum A2 of the opening areas of the openings 7 in 4c.

  According to such a configuration, the protruding portion 4 is disposed so that at least a portion 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, uneven shape) of the block 3 and the protrusion 4 in the tire width direction D1.

  Moreover, the rubber weight of the said part becomes large by presence of the protrusion part 4. FIG. Therefore, at least one of the plurality of protrusions 4 includes openings 6 and 7. Thereby, the nonuniformity of the weight balance resulting from presence of the protrusion part 4 can be suppressed. Moreover, the traction performance is exhibited by the surfaces and edges of the openings 6 and 7.

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

  Thereby, for example, since the rock easily comes into contact with the surface or edge of the opening 6 in the inner region 4b, friction is easily generated between the opening 6 and the rock. Therefore, for example, particularly, the traction performance at a rocky place can be improved efficiently.

  Further, in the pneumatic tire 1 according to the present embodiment, 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 projecting portion 4 is that of the inner region 4b. The ratio (A1 / A3) is configured to be larger than the ratio (A2 / A4) of the outer region 4c.

  According to such a configuration, in the ratio of the total opening areas A1 and A2 of the openings 6 and 7 to the actual surface areas A3 and A4 of the protrusion 4, the ratio (A1 / A3) of the inner area 4b is equal to the outer area. Since it is larger than the ratio (A2 / A4) of 4c, for example, the rock easily comes into contact with the surface or edge of the opening 6 of the inner region 4b. Thereby, for example, since friction is more easily generated between the opening 6 of the inner region 4b and the rock, the traction performance at the rocky place can be further effectively improved.

  In the pneumatic tire 1 according to this 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, since 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, the surface of the opening 6 in the inner region 4b becomes larger. Thereby, for example, since the frictional force between the opening 6 in the inner region 4b and the rock increases, the traction performance at the rocky place can be improved more efficiently.

  In the pneumatic tire 1 according to this embodiment, the protruding amount of the protruding portion 4 in the inner region 4b is larger than the protruding amount of the protruding portion 4 in the outer region 4c.

  According to such a configuration, since the protruding amount of the protruding portion 4 in the inner region 4b is larger than the protruding amount of the protruding portion 4 in the outer region 4c, for example, the rubber volume of the inner region 4b is reduced. Can be suppressed. Thereby, the fall of the damage resistance performance of the inner side area | region 4b can be suppressed, for example.

  In addition, a pneumatic tire is not limited to the structure of above-described embodiment, and is not limited to the above-mentioned effect. It goes without saying that the pneumatic tire can be variously modified without departing from the gist 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 employed in the configurations and methods according to the above-described embodiments.

  In the pneumatic tire 1 according to the above embodiment, the ratio of the total area A1 and A2 of the openings 6 and 7 to the actual surface areas A3 and A4 of the protrusion 4 is the ratio (A1 / A3) of the inner region 4b. ) 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.

  Moreover, in the pneumatic tire 1 which concerns on the said embodiment, it is the structure that the depth of the opening part 6 in the inner side area | region 4b is deeper than the depth of the opening part 7 in the outer side area | 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.

  Moreover, in the pneumatic tire 1 which concerns on the said embodiment, it is the structure that the protrusion amount of the protrusion part 4 in the inner side area | region 4b is larger than the protrusion amount of the protrusion part 4 in the outer side area | 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. 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.

  In the pneumatic tire 1 according to the above 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, the structure that the opening part is provided with one or three or more with respect to one protrusion part 4 may be sufficient.

  For example, as shown in FIG. 10, one opening 8 may be provided for one protrusion 4. Further, for example, as shown in FIG. 11, three openings 8 may be provided for one protrusion 4. Further, for example, as shown in FIG. 12, five openings 8 may be provided for one protrusion 4.

  Moreover, in the pneumatic tire 1 which concerns on the said embodiment, it is the structure that the opening parts 6 and 7 are formed in square shape by tire width direction D1 view. 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 as 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 (perfect circular shape, elliptical shape) as viewed in the tire width direction D1. Further, for example, as shown in FIG. 13, the opening 8 may be formed in a triangular shape as viewed in the tire width direction D1.

  Moreover, in the pneumatic tire 1 which concerns on the said embodiment, it is the structure that the opening parts 6 and 7 are provided in all the protrusion parts 4. FIG. 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 and 7 are preferably provided in at least one-fourth of the plurality of protrusions 4, more preferably provided in at least one-third, and provided in at least one-half. The configuration is more preferable.

  Moreover, in the pneumatic tire 1 which concerns on the said embodiment, all the protrusion parts 4 are the same shapes, and it is the structure that all the opening parts 6 and 7 are the same shapes. However, the pneumatic tire is not limited to such a configuration. For example, the protrusion 4 may have a plurality of different shapes and may be arranged in order in the tire circumferential direction D3. Further, for example, the openings 6 and 7 may have a plurality of different shapes, and may be arranged in order in the tire circumferential direction D3 on the respective protrusions 4.

  Moreover, in the pneumatic tire 1 which concerns on the said embodiment, it is the structure that the opening parts 6 and 7 are each arrange | positioned away from both the edges of the tire radial direction D2 of the protrusion part 4. FIG. However, the pneumatic tire is not limited to such a configuration. For example, the structure that the opening parts 6 and 7 are arrange | positioned away only from one edge of the tire radial direction D2 of the protrusion part 4 may be sufficient.

  Moreover, in the pneumatic tire 1 which concerns on the said embodiment, it is the structure that the opening parts 6 and 7 are each arrange | positioned away from both the edges of the tire circumferential direction D3 of the protrusion part 4. FIG. However, the pneumatic tire is not limited to such a configuration. For example, the structure in which the openings 6 and 7 are disposed away from only one end edge of the protrusion 4 in the tire circumferential direction D3 may be employed.

  Moreover, in the pneumatic tire 1 which concerns on the said embodiment, the protrusion part 4 is the structure that it is provided in both of a pair of side wall parts 12. FIG. However, the pneumatic tire is not limited to such a configuration. For example, the protruding portion 4 may be provided on one of the pair of sidewall portions 12. For example, the structure that the protrusion part 4 is provided at least in the side wall part 12 arrange | positioned outside at the time of vehicle mounting among a pair of side wall parts 12 may be sufficient.

  Further, in the pneumatic tire 1, the opening portions 6 and 7 are the protruding portions 4 of the sidewall portion 12 on one side, whereas the protruding portions 4 are provided on both of the pair of sidewall portions 12. It is also possible to have a configuration in which the projections 4 of both sidewall portions 12 are provided. For example, the configuration may be such that the openings 6 and 7 are provided at least on the protruding portion 4 of the sidewall portion 12 that is disposed outside when the vehicle is mounted, of the pair of sidewall portions 12.

DESCRIPTION OF SYMBOLS 1 ... Pneumatic tire, 2 ... Groove, 3 ... Block, 4 ... Projection part, 4a ... Outer end, 4b ... Inner area | region, 4c ... Outer area | region, 5 ... Annular protrusion, 6 ... 1st opening part, 7 ... 1st 2 opening part, 8 ... opening part, 11 ... bead part, 11a ... bead, 11b ... bead core, 11c ... bead filler, 11d ... rim strip rubber, 11e ... outer end, 12 ... sidewall part, 12a ... sidewall rubber, 12b: Maximum tire 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 direction Inward, D2b ... tire radial direction outer side, D3 ... tire circumferential direction, S1 ... tire equatorial plane, S2 ... profile surface of

Claims (4)

Sidewall portions extending in the tire radial direction;
A tread portion on the outer side in the tire radial direction, and a tread portion connected to the outer end in the tire radial direction of the sidewall portion, and
The tread portion includes a tread rubber disposed on the outer side in the tire radial direction, and at least one belt ply disposed 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 parallel in the tire circumferential direction by being partitioned into the plurality of grooves.
The sidewall portion includes a plurality of protruding portions protruding in the tire width direction,
The protrusion is arranged such that at least a portion thereof overlaps one of the plurality of blocks in the tire radial direction when viewed in the tire width direction,
At least one of the plurality of protrusions includes 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 the position of the outer end in the tire width direction of the belt ply disposed on the innermost side in the tire radial direction, and the tire radial direction And an outer area arranged outside the
A pneumatic tire, wherein a sum of opening areas of the openings in the inner region is larger than a sum of opening areas of the openings in the outer region.   2. The pneumatic tire according to claim 1, wherein in the ratio of the total opening area of the opening to the actual surface area of the protrusion, the ratio of the inner region is larger than the ratio of the outer region.   The pneumatic tire according to claim 1, wherein a depth of the opening in the inner region is deeper than a depth of the opening in the outer region. The pneumatic tire according to any one of claims 1 to 3, wherein a protruding amount of the protruding portion in the inner region is larger than a protruding amount of the protruding portion in the outer region.

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