JP2010260418A - Pneumatic tire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pneumatic tire capable of effectively suppressing the temperature rise of, in particular, a tire side part when projection parts are provided on the tire side part. <P>SOLUTION: The pneumatic tire 1 has a plurality of projection parts 100 projecting outwardly in the tread width direction from an outer surface 9 of a tire side part. The projection parts 100 extend along the tire radial direction D, and are arranged along the tire circumferential direction R. A longitudinal groove 110 extending along the tire radial direction D and recessed from the outer surface 9 along the tread width direction W is formed between one projection part 100 and another through hole part 100 adjacent thereto in the tire circumferential direction R. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a pneumatic tire including a plurality of protrusions that protrude from the outer side surface of a tire side portion toward the outer side in the tread width direction.

  Conventionally, in a pneumatic tire mounted on an automobile, in particular, a heavy-duty pneumatic tire mounted on a construction vehicle such as a dump truck, the tire side portion The structure which provides the fin-shaped projection part extended along a tire radial direction is used for the outer side surface of this (for example, patent document 1).

  According to such a protrusion, the air flowing along the tire side part gets over the protrusion and the flow is disturbed. That is, the protrusion causes turbulence in the air flowing along the outer surface of the tire side portion as the pneumatic tire rolls. When the air whose flow has been disturbed touches the tire side portion again, heat dissipation from the tire side portion is promoted.

International Publication No. 2007/032405 (page 6-7, Fig. 2)

  By the way, in a general pneumatic tire, in the bead part, for example, a bead filler is provided and the carcass layer is folded. For this reason, the vicinity of the bead portion is formed thicker in the tread width direction than the other tire side portions. When the protrusions described above are provided in the vicinity of the bead portion of such a pneumatic tire, the temperature of the outer side surface of the tire side portion can be reduced, but there is a concern that the temperature inside the tire side portion cannot be reduced. . For this reason, more effective heat dissipation from the tire side portion has been desired.

  Therefore, the present invention has been made in view of such a situation, and in particular, when a protrusion is provided on the tire side portion, a pneumatic tire capable of effectively suppressing a temperature increase in the tire side portion is provided. The purpose is to do.

In order to solve the above-described problems, the present invention has the following features. First, the first feature of the present invention is a pneumatic system including a plurality of protrusions (protrusion parts 100) protruding outward from the outer surface (outer surface 9) of the tire side part (tire side part 8) in the tread width direction. A tire (pneumatic tire 1), wherein the plurality of protrusions are arranged in a tire radial direction (tire radial direction D).
) Extending along the tire circumferential direction (tire circumferential direction R) and extending along the tire radial direction between the projection and the projection adjacent to the tire circumferential direction. The gist is that a longitudinal groove (longitudinal groove 110) that is recessed from the outer surface along the tread width direction (tread width direction W) is formed.
According to such a feature, the protrusion causes turbulence in the air flowing along the outer side surface of the tire side portion as the pneumatic tire rolls. Moreover, the longitudinal groove formed between the protrusion and the protrusion adjacent to the tire circumferential direction is recessed from the outer surface along the tread width direction. That is, the air flowing along the outer side surface of the tire side portion gets over the protrusions, and the air whose flow is disturbed enters the vertical groove, so that heat radiation inside the tire side portion forming the vertical groove is promoted.

  In addition to the formation of the vertical grooves, the surface area of the tire side portion corresponding to the vertical grooves is increased in addition to the protrusions. For this reason, the heat dissipation effect of the tire side portion is further improved.

  Therefore, when a protrusion is provided on the tire side portion, it is possible to provide a pneumatic tire that can effectively suppress an increase in temperature of the tire side portion. A second feature of the present invention relates to the first feature of the present invention, wherein the width of the longitudinal groove along the tire circumferential direction is the distance between the projection and the projection adjacent to the tire circumferential direction. It is summarized as being from 5% to 95%.

  A third feature of the present invention relates to the first or second feature of the present invention, wherein in the tire circumferential direction, the longitudinal groove is formed so as to overlap the entire region of the protrusion adjacent to the tire circumferential direction. This is the gist.

  According to the characteristics of the present invention, in the case where the tire side portion is provided with the protrusion, it is possible to provide a pneumatic tire that can effectively suppress the temperature rise of the tire side portion.

It is a side wall surface view of the tire side part side in the pneumatic tire concerning the embodiment of the present invention. 1 is a partially exploded perspective view showing a pneumatic tire according to an embodiment of the present invention. It is sectional drawing which shows the pneumatic tire which concerns on embodiment of this invention. It is a partially expanded perspective view which shows the protrusion part and vertical groove of the pneumatic tire which concern on embodiment of this invention. It is sectional drawing which shows the turbulent flow generation state in the projection part and vertical groove of the pneumatic tire which concerns on embodiment of this invention. It is a figure which shows the relationship between the ratio of the height with respect to the space | interval of the projection part of the pneumatic tire which concerns on embodiment of this invention, and a heat transfer rate. It is a figure which shows the relationship between the ratio of the width | variety with respect to the space | interval of the projection part of the pneumatic tire which concerns on embodiment of this invention, and a heat transfer rate. It is sectional drawing which shows the projection part and longitudinal groove of the pneumatic tire which concern on other embodiment of this invention.

  Next, an embodiment of a pneumatic tire according to the present invention and other embodiments will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic and ratios of dimensions are different from actual ones.

  Accordingly, specific dimensions and the like should be determined in consideration of the following description. Moreover, it is a matter of course that portions having different dimensional relationships and ratios are included between the drawings.

[Embodiment]
A pneumatic tire according to an embodiment of the present invention will be described. Specifically, (1) Configuration of pneumatic tire, (2) Detailed configuration of protrusion, (3) Detailed shape of longitudinal groove, (4) Mechanism of turbulent flow generation, and (5) Comparative evaluation will be described. .

(1) Configuration of Pneumatic Tire A configuration of the pneumatic tire 1 according to the present embodiment will be described with reference to the drawings. FIG. 1 is a side wall view of a tire side portion side in a pneumatic tire 1 according to an embodiment of the present invention. FIG. 2 is a partially exploded perspective view showing the pneumatic tire 1 according to the embodiment of the present invention. FIG. 3 is a cross-sectional view showing the pneumatic tire 1 according to the embodiment of the present invention.

  The pneumatic tire 1 is a heavy duty pneumatic tire mounted on a construction vehicle such as a dump truck. As shown in FIGS. 1 to 3, the pneumatic tire 1 includes a bead 3, a carcass 5, an inner liner 7, a tread 13, a belt 15, and a protrusion 100. The pneumatic tire 1 is a tire filled with air at a predetermined pressure, but may be filled with an inert gas such as nitrogen gas instead of air.

(1.1) The bead bead 3 is a portion that fits into the rim flange 17 when the pneumatic tire 1 is fixed to the rim flange 17. The bead 3 has at least a bead core 3a and a bead filler 3b. The bead core 3 a becomes the core of the bead 3. The bead filler 3 b is provided between the carcass 5 in which the bead core 3 a is folded back, and suppresses deformation of the bead 3.

(1.2) Carcass The carcass 5 forms the skeleton of the pneumatic tire 1. The carcass 5 is provided toward the other bead core 3a from the one bead core 3a via the inner side in the tire radial direction of the tread 13 by folding the bead core 3a. The carcass 5 is composed of a carcass cord and rubber.

(1.3) Inner liner The inner liner 7 is formed of a highly airtight rubber layer serving as a tube. The inner liner 7 is provided inside the carcass 5.

(1.4) Belt The belt 15 reinforces the tread 13 while maintaining the shape of the pneumatic tire 1. The belt 15 is provided outside the carcass 5 in the tire radial direction. A plurality of belts 15 are provided, and each belt 15 has a belt shape along the tire circumferential direction R.

(1.5) Tread The tread 13 has a tread pattern and is in contact with the road surface. The tread 13 is provided on the outer side of the belt 15 in the tire radial direction.

(1.6) Protruding portion The protruding portion 100 protrudes from the outer side surface 9 of the tire side portion 8 toward the outer side in the tread width direction. The tire side portion 8 is located between the tread 13 and the bead 3.

(2) Detailed structure of protrusion part The protrusion part 100 of the pneumatic tire 1 which concerns on this embodiment is demonstrated, referring drawings. FIG. 4 is a partially enlarged perspective view showing the protrusion 100 and the longitudinal groove 110 of the pneumatic tire 1 according to the embodiment of the present invention.

  As shown in FIG. 2, the protrusion 100 extends along the tire radial direction D. The protrusions 100 are provided at predetermined pitches P (details will be described later) along the tire circumferential direction R. As shown in FIG. 3, the protrusion 100 is a bead outer position that is a position on the outer side 9 in the tire radial direction of the bead 3 that is in contact with the rim flange 17 from the tire width maximum position P1 that is the position of the tire maximum width TW. It is provided in a range D1 up to P2.

  In the cross section in the tread width direction, a protrusion that is a distance from the innermost protrusion position P3 that is the innermost position in the tire radial direction of the protrusion 100 to the outermost rim position P4 that is the outermost position in the tire radial direction of the rim flange 17 -It is preferable that the distance d between rims is set at 20-200 mm.

  If the protrusion-rim distance d is smaller than 20 mm, the protrusion 100 may be scraped due to contact with the rim flange 17, and the durability of the protrusion 100 may be reduced. On the other hand, if the protrusion-rim distance d is larger than 200 mm, it is insufficient to reduce the temperature in the vicinity of the bead 3 that is originally formed thicker than the outer surface 9 in the other tire side portion 8. May not be reduced efficiently.

  As shown in FIG. 4, the protrusion width w <b> 1 that is the width of the lower side in the cross-sectional shape substantially orthogonal to the extending direction of the protrusion 100 is set to 2 to 10 mm. If the projection width w1 is shorter than 2 mm, the strength of the projection 100 becomes too weak, and the projection 100 is vibrated by the air over the projection 100. That is, the durability of the protrusion 100 itself may be reduced. On the other hand, if the projection width w1 is longer than 10 mm, it is insufficient to reduce the temperature (heat storage temperature) inside the tire side portion 8 where the projection 100 is formed, and the tire temperature can be efficiently reduced. May not be possible.

  The protrusion height h1 that is the height from the outer surface 9 to the position where the protrusion 100 protrudes most is set to 3 to 20 mm. In particular, the projection height h1 is preferably set to 7.5 to 15 mm.

  If the projection height h1 is lower than 3 mm, it is insufficient to accelerate the air flow over the projection 100, and the tire temperature may not be reduced efficiently. On the other hand, if the projection height h1 is higher than 20 mm, it is insufficient to reduce the temperature (heat storage temperature) inside the tire side portion 8 where the projection 100 is formed, and the strength of the projection 100 is weak. In some cases, the problem described above may occur.

  Here, 1.0 ≦ p / h ≦ 20 when the above-described protrusion height h1 is “h”, the pitch P between adjacent protrusions 100 is “p”, and the protrusion width w1 is “w”. 0.0 and 1.0 ≦ (p−w) /w≦100.0 are preferably satisfied.

  In particular, the relationship of 2.0 ≦ p / h ≦ 15.0 is preferable, and the relationship of 4.0 ≦ p / h ≦ 10.0 is more preferable. Moreover, it is preferable to set the relationship of 5.0 ≦ (p−w) /w≦70.0, and it is more preferable to set the relationship of 10.0 ≦ (p−w) /w≦30.0. . The pitch P is a distance between points obtained by dividing the width in the center in the extending direction of the protrusion 100 into two equal parts. Further, (p / h) is measured at an intermediate position from the innermost radial direction of the protrusion 100 (tire width maximum position P1) to the outermost radial direction of the protrusion 100 (bead outer position P2). Shall.

  As described above, the air flow over the protrusions 100 chops the pitch P too finely, that is, if the pitch P is narrowed, the air over the protrusions 100 does not enter the vertical grooves 110 and the pitch P is too wide. Since it becomes equivalent to the case where there is no shape processing of the projection part 100, it is preferable to set to the above numerical range.

  Further, (p−w) / w indicates the ratio of the protrusion width w1 to the pitch P. If this is too small, the ratio of the surface area of the protrusion 100 to the area of the surface on which heat dissipation is desired to be improved becomes equal. It is the same as that. Since the protrusion 100 is made of rubber and cannot be expected to improve heat dissipation due to an increase in surface area, the minimum value of (p−w) / w is defined as 1.0.

  Further, the protrusion 100 preferably satisfies the relationship of 1.0 ≦ h / w ≦ 10 when the protrusion height h1 is “h” and the protrusion width w1 is “w”.

  If the ratio (h / w) of the ratio of the protrusion width w1 to the protrusion height h1 is smaller than 1.0, it is insufficient for accelerating the air over the protrusion 100, and the tire temperature, particularly the bead. In some cases, the temperature in the vicinity of 3 cannot be efficiently reduced. When the value (h / w) of the ratio of the protrusion width w1 (w) to the protrusion height h1 (h) is greater than 10, the temperature inside the tire side part 8 where the protrusion 100 is formed (heat storage temperature) is This is insufficient to reduce the tire temperature, and the tire temperature may not be reduced efficiently.

(3) Detailed Shape of Vertical Groove As shown in FIGS. 2 to 4, a vertical groove 110 is formed between the protrusion 100 and the protrusion 100 adjacent in the tire circumferential direction R. The longitudinal groove 110 extends along the tire radial direction D. The longitudinal groove 110 is recessed from the outer surface 9 along the tread width direction W. Specifically, the vertical groove 110 has a predetermined depth along the tread width direction W. In the tire circumferential direction R, the longitudinal groove 110 is formed so as to overlap the entire region of the protrusion 100 adjacent to the tire circumferential direction R.

  In the tire circumferential direction R, the groove width W2, which is the width of the longitudinal groove 110, is 5% or more and 95% or less of the pitch P between the protrusion 100 and the protrusion 100 adjacent in the tire circumferential direction R.

  The longitudinal groove 110 is formed by a wall portion located on the inner side in the tread width direction than the outer surface 9. Specifically, the vertical groove 110 is formed by a wall surface 112, a bottom side 114, and a wall surface 116. The wall surface 112 and the wall surface 116 are connected to the outer surface 9 and inclined with respect to the inner side in the tread width direction. The base 114 is substantially parallel to the outer surface 9, and both ends are connected to the wall surface 112 and the wall surface 116. The projection height h2 that is the height from the outer side surface 9 to the bottom side 114 of the vertical groove 110 is set to 3 to 20 mm. In particular, the projection height h2 is preferably set to 7.5 to 15 mm.

(4) Mechanism of turbulent flow generation As shown in FIG. 5, the air S1 flowing along the outer side surface 9 of the tire side portion 8 gets over the protrusion 100 as the pneumatic tire 1 rolls, and the flow is disturbed. When the air S <b> 1 touches the tire side portion 8 again, it enters the longitudinal groove 110. That is, the air S <b> 1 whose flow is disturbed enters the inside of the tire side portion 8 by a predetermined depth from the outer side surface 9, and heat dissipation inside the tire side portion 8 is promoted. Furthermore, when the air S1 collides with the protrusion 100, the heat dissipation of the protrusion 100 itself is also promoted.

  Further, the air S2 staying on the inner surface 101 side of the protrusion 100 against which the air S1 hits and the air S3 staying on the outer surface 103 (back surface) side opposite to the inner surface 101 are in the vicinity of the inner surface 101 and the outer surface 103. The heat of the outer side surface 9 of the tire side portion 8 located at the position is taken and merged with the air S1, and the heat radiation of the tire side portion 8 is further promoted.

(5) Comparative Evaluation Next, in order to further clarify the effect of the present invention, comparative evaluation performed using pneumatic tires according to the following comparative examples and examples will be described. Specifically, (5.1) Evaluation method and (5.2) Evaluation result will be described. In addition, this invention is not limited at all by these examples.

(5.1) Evaluation Method Using the pneumatic tires of the comparative examples and examples, (5.1.1) temperature reduction evaluation and (5.1.2) durability evaluation were performed. The pneumatic tires according to comparative examples and examples used for comparative evaluation will be specifically described. In addition, the data regarding a pneumatic tire were measured on the conditions shown below.

・ Tire size: 59 / 80R63
・ Rim size: Rim size corresponding to the tire size described in ETRTO ・ Internal pressure condition: Air pressure corresponding to the maximum load described in ETRTO ・ Load condition: Maximum load described in ETRTO (maximum load capacity)
・ Vehicle type: Heavy-duty dump truck (320-ton dump truck)

  Each pneumatic tire is different in the presence or absence of protrusions and the presence or absence of vertical grooves, and the configuration other than the presence or absence of protrusions and the presence or absence of vertical grooves is the same as the pneumatic tire 1 according to the embodiment. The characteristics of each pneumatic tire are shown below.

  The pneumatic tire according to Comparative Example 1 is different from the pneumatic tire 1 according to the embodiment in that no protrusion is provided on the tire side portion and no vertical groove is formed.

  The pneumatic tire according to Comparative Example 2 is different from the pneumatic tire 1 according to the embodiment in that a protrusion is provided on the tire side portion, but a longitudinal groove is not formed.

  The pneumatic tire according to the example is the same as the pneumatic tire 1 according to the embodiment.

(5.1.1) Temperature reduction evaluation Evaluation method: Each pneumatic tire is mounted on a vehicle, traveled at 15 km / h for 24 hours, and then moved along the tire radial direction D to a position 20 mm from the rim outermost position P4. A thermocouple was inserted into the hole formed in advance, and the temperature of the outer 5 mm in the tread width direction was measured from the folded carcass. The measurement result was calculated from the average value of the temperatures measured at six locations along the tire circumferential direction R.

  The evaluation was performed by calculating a temperature reduction value based on the temperature of the pneumatic tire according to Comparative Example 1.

(5.1.2) Durability Evaluation Next, when the above-described protrusion height h1 is “h”, the pitch P between adjacent protrusions 100 is “p”, and the protrusion width w1 is “w”. FIG. 15 and FIG. 16 show the results of the durability test using turbulent flow generation projections having different p / h and (p−w) / w. The vertical axes of the graphs of FIGS. 15 and 16 indicate the heat obtained by applying a constant voltage to the heater to generate a certain amount of heat and measuring the temperature and wind speed of the tire surface when it is sent by a blower. It is a transmission rate. That is, the greater the heat transfer coefficient, the higher the cooling effect and the better the durability. Here, the heat transfer coefficient of a pneumatic tire (conventional example) without a turbulent flow generation projection is set to “100”.

(5.2) Evaluation Results Table 1 shows the evaluation results using the pneumatic tires according to the comparative examples and examples described above.

  As shown in Table 1, the pneumatic tire according to the example was able to effectively suppress the temperature increase in the tire side portion as compared with the pneumatic tire according to Comparative Examples 1 and 2.

  As shown in FIG. 15, the relationship between the ratio (p / h) of the pitch P of the turbulent flow generation projections and the projection height h1 (p / h) and the durability performance is that p / h is 1.0 or more and 20 The heat transfer coefficient is increased by being within the range of 0.0 or less. By setting p / h in the range of 2.0 to 15.0, the heat transfer rate is better and the durability is higher. For this reason, it is preferable to set the range of 1.0 ≦ p / h ≦ 20.0, and it is particularly preferable to set the range of 2.0 ≦ p / h ≦ 15.0, and 4.0 ≦ p. It can be seen that it is more preferable to set the range of /h≦10.0. As shown in FIG. 16, the relationship between (p−w) / w and the heat transfer coefficient (measured by the same method as the above heat transfer coefficient) is 1.0 ≦ (p−w) /w≦100.0. The heat transfer coefficient is increased by being within the range. In particular, it is preferably set in the range of 5.0 ≦ (p−w) /w≦70.0, and more preferably set in the range of 10.0 ≦ (p−w) /w≦30.0. I understand that.

(6) Action / Effect As described above, the protrusion 100 of the pneumatic tire 1 according to the present embodiment has the air that flows along the outer surface 9 of the tire side portion 8 as the pneumatic tire 1 rolls. Cause turbulence. Further, the longitudinal groove 110 formed between the protrusion 100 and the protrusion 100 adjacent in the tire circumferential direction R is recessed from the outer surface 9 along the tread width direction W. That is, the air flowing along the outer side surface 9 of the tire side portion 8 gets over the protrusion 100 and the air whose flow is disturbed enters the vertical groove 110, so that the inside of the tire side portion 8 forming the vertical groove 110 is formed. Heat dissipation is promoted.

  Further, the formation of the longitudinal groove 110 increases the surface area of the tire side portion 8 corresponding to the longitudinal groove 110 in addition to the protrusion 100. For this reason, the heat dissipation effect of the tire side portion 8 is further improved. Therefore, when the projection part 100 is provided in the tire side part 8, the pneumatic tire 1 which can suppress effectively the temperature rise of the tire side part 8 can be provided especially.

  According to the present embodiment, in the tire circumferential direction R, the groove width W2 of the longitudinal groove 110 is a length that is 5% or more and 95% or less of the pitch P between the projection 100 and the projection 100 adjacent to the tire circumferential direction R. That's it. When the groove width W2 is 5% or more of the pitch P, the heat dissipated inside the tire side portion 8 forming the vertical groove 110 is surely promoted by the air whose flow is disturbed over the protrusions 100. . On the other hand, since the groove width W2 is 95% or less of the pitch P, the air S2 staying on the inner side surface 101 side and the air S3 staying on the outer side surface 103 (back side) opposite to the inner side surface 101 are sufficient. Therefore, the heat radiation of the tire side portion 8 is further promoted.

  According to the present embodiment, in the tire circumferential direction R, the longitudinal groove 110 is formed so as to overlap the entire region of the protrusion 100 adjacent to the tire circumferential direction R. For this reason, the ratio of the air which flows into the vertical groove 110 increases in the air which got over the protrusion part 100 and the flow was disturbed. That is, the heat turbulent in the tire side portion 8 forming the longitudinal groove 110 is further efficiently promoted by the air whose flow is disturbed.

[Other Embodiments]
Although the contents of the present invention have been disclosed through the embodiments of the present invention as described above, it should not be understood that the descriptions and drawings constituting a part of this disclosure limit the present invention. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art.

  For example, the embodiment of the present invention can be modified as follows. The longitudinal groove 110 of the pneumatic tire 1 in the embodiment described above is formed by the wall surface 112, the bottom side 114, and the wall surface 116. The present invention is not limited to this, and may be any shape that is recessed from the outer surface along the tread width direction W as shown in FIG. FIG. 8 is a cross-sectional view showing protrusions and vertical grooves of a pneumatic tire according to another embodiment of the present invention. Specifically, as shown in FIG. 8A, the longitudinal groove 110A may be formed of a wall surface having a curved cross section. Moreover, as shown in FIG.8 (b), the vertical groove 110B may be formed of the inclined surface which inclines in the tread width direction inner side from an outer surface. Further, as shown in FIG. 8C, the longitudinal groove 110C may be formed by a wall surface extending from the outer surface along the tread width direction and a bottom side.

  Further, the protrusion 100 of the pneumatic tire 1 in the above-described embodiment protrudes outward in the tread width direction along the substantially vertical direction from the outer surface 9, but is not limited to this, and extends outward in the tread width direction. It only has to be. Specifically, it may be formed by a curve from the outer surface 9 toward the outer side in the tread width direction. Further, the upper surface of the protrusion 100 may not be formed substantially parallel to the outer surface 9 and may be inclined toward the tire circumferential direction R.

  The pneumatic tire 1 in the above-described embodiment is a heavy-duty pneumatic tire that is mounted on a construction vehicle such as a dump truck. The present invention is not limited to this, and may be used, for example, as a general pneumatic tire for passenger cars. Even in such a general pneumatic tire for a passenger car, the temperature rise of the tire side portion can be effectively suppressed.

  In the tire circumferential direction R, the longitudinal groove 110 in the above-described embodiment is formed so as to overlap the entire region of the protrusion 100 adjacent to the tire circumferential direction R. The present invention is not limited to this, and the longitudinal groove 110 may not overlap the entire region of the protrusion 100 adjacent to the tire circumferential direction R.

  As described above, the present invention naturally includes various embodiments that are not described herein. Therefore, the technical scope of the present invention is defined only by the invention specifying matters according to the scope of claims reasonable from the above description.

D: tire radial direction, P: interval, P1: tire width maximum position, P2: bead outer position, P3: protrusion innermost position, P4: rim outermost position, R: tire circumferential direction, S1, S2, S3 ... air TW: tire maximum width, W: tread width direction, W2: groove width, d: distance between rims, w1: protrusion width, 1 ... pneumatic tire, 3 ... bead, 3a ... bead core, 3b ... bead filler, 5 ... Carcass, 7 ... inner liner, 8 ... tire side portion, 9 ... outer surface, 13 ... tread, 15 ... belt, 17 ... rim flange, 100 ... projection, 101 ... inner surface, 103 ... outer surface, 110 ... longitudinal groove 112, 116 ... wall surface, 114 ... bottom

Claims (3)

A pneumatic tire comprising a plurality of protrusions projecting from the outer side surface of the tire side portion toward the outer side in the tread width direction,
The plurality of protrusions extend along the tire radial direction and are provided at predetermined intervals along the tire circumferential direction.
A pneumatic tire in which a vertical groove extending along the tire radial direction and recessed from the outer surface along the tread width direction is formed between the protrusion and the protrusion adjacent to the tire circumferential direction.   2. The pneumatic tire according to claim 1, wherein, in the tire circumferential direction, the width of the longitudinal groove is 5% or more and 95% or less of an interval between the protrusion and the protrusion adjacent to the tire in the circumferential direction.   The pneumatic tire according to claim 1 or 2, wherein in the tire circumferential direction, the longitudinal groove is formed so as to overlap with an entire region of the protrusion adjacent to the tire circumferential direction.

Images