JP2013139219A - Pneumatic tire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pneumatic tire, which suppresses a relative movement of an installation member with respect to the tire along a circumferential direction, inhibits the installation member from falling away and improves durability of the member.SOLUTION: The pneumatic tire includes an installation member 20 configured detachably by a fitting structure between a groove portion 12 and a projection 21 extending in a tire circumferential direction CD, with respect to a tire sidewall surface 10. On both surfaces including a groove bottom surface 13 (prescribed surface) which is set as a prescribed surface in a groove surface constituting the groove portion 12, and an opposed surface 21a of the installation member 20, which is opposed to the groove bottom surface 13, a plurality of convex portions 40 (linear convex portions 41) protruding to the other end surface are provided, and a plurality of concave portions 50 (linear concave portions 51) which interfere with the convex portions 40 (linear convex portions 41) in the tire circumferential direction CD are provided on the surfaces of the counter members of the plurality of convex portions 40 (linear convex portions 41).

Description

  The present invention relates to a pneumatic tire in which a mounting member is attached to a tire side wall surface.

  In many cases, various mounting members formed in an arc shape or an annular shape are detachably attached to the tire side wall surface extending from the bead portion through the sidewall portion to the tread portion. Examples of the mounting member include a rim protector for protecting the rim flange and a decorative member for dressing up.

  As an example of a mounting member as a rim protector, Patent Document 1 discloses that an arc-shaped rubber protective material as a mounting member is provided with either a protrusion or a groove extending along the tire circumferential direction, and the corresponding groove or protrusion. A tire is disclosed in which the other is formed on the tire side wall surface, and the rubber protective material is mounted on the tire side wall surface by the fitting structure of the protrusion and the groove.

  As an example of a mounting member as a decorative member, Patent Document 2 discloses a tire in which a color member having a color different from that of a tire body is fitted in a groove portion of a tire side wall surface.

JP-A-5-155206 Japanese Patent Laid-Open No. 11-151918

  When running with the mounting member attached to the tire side wall as described above, the mounting member is maintained in the tire circumferential direction while maintaining the fitting state with the tire side wall due to the centrifugal force caused by tire rotation and the expansion and contraction of the tire side wall. There may be relative movement along. In this case, friction is generated between the mounting member and the tire, rubber debris is generated, the groove portion is thinned, and the mounting member is easily dropped.

  Further, due to heat generated by friction, the durability of the mounting member and the tire side wall surface is significantly reduced.

  The present invention has been made paying attention to such problems, and its purpose is to suppress relative movement along the circumferential direction of the mounting member with respect to the tire, to prevent the mounting member from falling off and to be durable. The object is to provide a pneumatic tire with improved performance.

  In order to achieve the above object, the present invention takes the following measures.

  That is, the pneumatic tire of the present invention includes a pair of bead portions, sidewall portions extending outward in the tire radial direction from each of the bead portions, and a tread portion connecting the tire radial outer ends of the sidewall portions, An arcuate or annular mounting member configured to be detachable by a fitting structure of a groove and a protrusion extending in the tire circumferential direction with respect to a tire side wall surface extending from the bead portion through the sidewall portion to the tread portion. A pneumatic tire having at least one of a predetermined surface of the groove surfaces constituting the groove portion and an opposing surface of the mounting member facing the predetermined surface. A plurality of convex portions projecting to the surface of the plurality of convex portions, and a concave portion that interferes with the convex portion in the tire circumferential direction is provided on the mating surface of the plurality of convex portions. And butterflies.

  According to this configuration, since the convex portion and the concave portion interfere with each other in the tire circumferential direction, it is possible to suppress relative movement (rotation) of the mounting member with respect to the tire side wall surface. Therefore, the relative movement of the mounting member is suppressed, the wear of the groove portion is reduced, the falling of the mounting member can be suppressed, and the friction between the mounting member and the tire is suppressed, thereby improving the durability. It becomes possible.

  As the specific configuration, a plurality of linear protrusions extending along a predetermined direction are arranged on both the predetermined surface and the opposing surface, and the predetermined protrusions are arranged between the linear protrusions. It is mentioned that the linear recessed part extended along the direction is formed.

  In order to strengthen the fit between the protrusion and the groove and further suppress the relative movement of the mounting member, the predetermined direction is preferably inclined with respect to the tire circumferential direction.

  In order to achieve both prevention of rotation of the mounting member in one direction of the tire circumferential direction and assembling performance, the linear protrusion has an orthogonal surface orthogonal to the tire circumferential direction on one side of the tire circumferential direction, It is effective to have an inclined surface that is inclined with respect to the tire circumferential direction on the other side in the tire circumferential direction.

  In order to achieve both the prevention of the rotation of the mounting member in both directions in the tire circumferential direction and the assembling property, when the predetermined surface and the facing surface are partitioned into a plurality of regions along the tire circumferential direction, The linear protrusion formed in a part of the first region of the region has an orthogonal surface orthogonal to the tire circumferential direction on one side of the tire circumferential direction, whereas the first of the plurality of regions It is preferable that the said linear convex part formed in area | regions other than an area | region has the orthogonal surface orthogonal to a tire circumferential direction on the other side of a tire circumferential direction.

The tire meridian half section view showing an example of the pneumatic tire concerning the present invention. The tire side view which shows typically the groove part formed in the cyclic | annular swelling part of a tire side wall surface. The figure which shows typically the convex part and recessed part which are formed between protrusion and a groove part. (A) A1-A1 site | part sectional drawing in FIG. (B) The top view which looked at the groove bottom face from the groove depth direction. (C) A2-A2 site | part sectional drawing of (b). The figure which shows typically the convex part and recessed part which are formed between the protrusion and groove part which concern on other embodiment of this invention. The perspective view which shows typically the mounting member which concerns on embodiment other than the above of this invention. The figure which shows typically the groove part and mounting member which concern on embodiment other than the above of this invention. (A) The perspective view which shows a groove part and a mounting member typically. (B) The tire schematic side view showing the arrangement | sequence of a groove part.

  Hereinafter, a pneumatic tire according to an embodiment of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the pneumatic tire includes a pair of bead portions 1, sidewall portions 2 that extend outward from the respective bead portions 1 in the tire radial direction RD, and outer ends in the tire radial direction RD of the sidewall portions 2. And a tread portion 3 connecting the two. The bead portion 1 is provided with an annular bead core 1a formed by covering a converging body such as a steel wire with rubber and a bead filler 1b made of hard rubber. The bead portion 1 is attached to the bead seat 8b of the rim 8, and if the air pressure is normal (for example, the air pressure determined by JATMA), the bead portion 1 is appropriately fitted to the rim flange 8a by the tire internal pressure, and the tire is fitted to the rim 8. Is done.

  In addition, the tire includes a toroidal carcass layer 4 that is arranged so as to be bridged between the pair of beads 1 and extends from the tread portion 3 through the sidewall portion 2 to the bead portion 1. The carcass layer 4 is constituted by at least one carcass ply, and is locked in a state in which an end thereof is wound up via the bead core 1a. An inner liner rubber (not shown) for maintaining air pressure is disposed on the inner peripheral side of the carcass layer 4.

  On the outer periphery of the carcass layer 4 in the tread portion 3, a belt layer 5 that reinforces the carcass layer 4 due to an effect is disposed. The belt layer 5 has two belt plies having cords that extend at a predetermined angle with respect to the tire circumferential direction, and the plies are laminated so that the cords cross in opposite directions. A belt reinforcing layer 7 is disposed on the outer peripheral side of the belt layer 5, and a tread rubber having a tread pattern is disposed on the outer peripheral surface thereof.

  Examples of the raw rubber such as the rubber layer described above include natural rubber, styrene butadiene rubber (SBR), butadiene rubber (BR), isoprene rubber (IR), butyl rubber (IIR), and the like. Used in combination with more than one species. These rubbers are reinforced with fillers such as carbon black and silica, and a vulcanizing agent, a vulcanization accelerator, a plasticizer, an anti-aging agent and the like are appropriately blended.

  In the present embodiment, as shown in FIG. 1, the region from the contact portion with the rim flange 8 a to the tire maximum width portion Wh in the tire side wall surface 10 from the bead portion 1 through the sidewall portion 2 to the tread portion 3. Ar0 is provided with an annular bulging portion 11 bulging outward from the bead portion 1 in the tire width direction WD. In the present embodiment, the tire maximum width portion Wh is also the tire radial direction central portion RC. As shown in FIGS. 2 and 3A, the annular bulging portion 11 has a substantially trapezoidal cross section and extends in an annular shape along the tire circumferential direction CD, and is opposed to the outer peripheral curved surface of the rim flange 8a. An inner peripheral side surface 11a, an outer peripheral side surface 11b that gently connects to the outer wall of the tire maximum width portion Wh, and a top surface 11c that connects the inner peripheral side surface 11a and the outer peripheral side surface 11b.

  As shown in FIG. 1, an annular mounting member 20 is attached to the annular bulging portion 11. As shown in FIGS. 3A and 2, the top surface 11 c of the annular bulging portion 11 is formed with a groove portion 12 that opens toward the outer side in the tire width direction. The groove portion 12 extends in the tire circumferential direction CD and has an annular shape. As shown in FIG. 3A, the mounting member 20 has an annular protrusion 21 that fits into the groove 12 of the annular bulge 11, and is configured to be detachable by the fitting structure of the groove 12 and protrusion 21. Has been.

  As shown in FIG. 3A, the groove portion 12 includes a groove bottom surface 13 and first groove sidewalls 14a and 14a that form a pair from both side ends of the groove bottom surface 13 toward the opening side along the groove depth direction DD. , Second groove side walls 14b and 14b that form a pair from the opening side end of the first groove side wall 14a toward the inner side of the groove along a direction orthogonal to the groove depth direction DD, and the inner side of the second groove side wall 14b. It is comprised from the 3rd groove | channel side wall 14c * 14c which makes a pair which goes to an opening side along groove depth direction DD from an end. That is, the groove side wall 14 constituting the groove portion 12 is constituted by first to third groove side walls 14a, 14b, and 14c, and the groove opening side portion 14s protrudes inward from the groove bottom side portion 14t. Moreover, the groove part 12 has comprised the cross-sectional substantially T shape which has the linear site | part (2nd groove | channel side wall 14b) orthogonal to groove depth direction DD.

  As shown in FIG. 3A, the mounting member 20 has a projection 21 having a substantially T-shaped cross section corresponding to the groove 12 and a head 22 that protrudes from the top surface 11c (tire side wall surface) in the mounted state. The head 22 is formed in the same cross-sectional shape as at least a part of the protrusion 21, and the mounting member 20 as a whole has a cross-sectional shape (substantially H-shaped) in which the protrusion side and the head side are symmetrical. . The mounting member 20 preferably has a hardness equal to or higher than that of the rubber forming the tire side wall surface 10. The material of the mounting member 20 is preferably rich in elasticity, but an appropriate rubber or resin can be used. Examples of the resin material include thermoplastic elastomers (polyester elastomers, polyolefin elastomers, polyamide elastomers, polystyrene elastomers, polyvinyl chloride elastomers, polyurethane elastomers, etc.) and thermosetting elastomers (polyurethane elastomers, etc.). Various colors can be adopted for the mounting member 20, but if a color different from that of the tire side wall surface 10 is adopted, the decorativeness can be improved.

  By the way, in the said structure, the mounting member 20 moves relatively along the tire circumferential direction CD with respect to the tire side wall surface 10 with the groove part 12 and the protrusion 21 fitted by the centrifugal force of the tire and the expansion and contraction of the tire side wall part. There is a risk that.

  Therefore, in order to effectively prevent this relative movement, the following measures are taken. That is, as shown in FIGS. 3A, 3 </ b> B, and 3 </ b> C, the groove bottom surface 13 that is a predetermined surface of the groove surface (groove bottom surface 13 and groove side wall 14) constituting the groove portion 12 is attached. A plurality of convex portions 40 projecting to the mating surface are provided on both surfaces (the groove bottom surface 13 and the facing surface 21a) of the member 20 facing the groove bottom surface 13 which is a predetermined surface. A plurality of concave portions 50 that interfere with the convex portion 40 and the tire circumferential direction CD are provided on the mating surface of the convex portion 40.

  Specifically, the plurality of convex portions 40 are formed by arranging a plurality of linear convex portions 41 extending along a predetermined direction inclined with respect to the tire radial direction RD. In the plurality of recesses 50, a line recess 51 extending along the predetermined direction is formed between the plurality of line protrusions 41. The height of the linear protrusion 41 and the linear recess 51 is 0.3 mm, and the pitch of the linear protrusion 41 (linear recess 51) is set to 1 mm. These linear protrusion 41 and linear recess 51 are knurled in a jagged shape.

  As described above, the pneumatic tire of the present embodiment is opposed to the groove bottom surface 13 of the groove bottom surface 13 or the mounting member 20 of the groove surfaces (the groove bottom surface 13 and the groove side wall 14) constituting the groove portion 12. A plurality of convex portions 40 projecting to the mating surface are provided on both surfaces of the facing surface 21a, and the concave portion 50 interferes with the convex portion 40 and the tire circumferential direction on the mating surface of the plurality of convex portions 40. Is provided. According to this configuration, since the convex portion 40 and the concave portion 50 interfere with each other in the tire circumferential direction CD, the relative movement (rotation) of the mounting member 20 with respect to the tire sidewall surface 10 can be suppressed. Accordingly, the relative movement of the mounting member 20 is suppressed, the wear of the groove portion 12 is reduced, the falling off of the mounting member 20 can be suppressed, and the friction between the mounting member 20 and the tire is suppressed, resulting in durability. It becomes possible to improve the property.

  In the present embodiment, a plurality of linear protrusions 41 extending along a predetermined direction are arranged on both the groove bottom surface 13 and the opposing surface 21a, which are predetermined surfaces, and between the linear protrusions 41. Since the linear recess 51 extending along the predetermined direction is formed, the fitting between the protrusion 21 and the groove 12 is strengthened, and the relative movement of the mounting member 20 can be suppressed.

  In particular, in the present embodiment, since the predetermined direction is inclined with respect to the tire circumferential direction CD, the linear protrusions 41 that can be disposed per unit area of the groove bottom surface 13 and the opposing surface 21a, which are predetermined surfaces, and Since the linear recess 51 can be secured long, the fitting between the protrusion 21 and the groove 12 is further strengthened, and the relative movement of the mounting member 20 can be further suppressed.

[Other Embodiments]
(1) In the present embodiment, as shown in FIG. 3, the line convex part 41 and the line concave part 51 are formed on the groove bottom surface 13 constituting the groove part 12, but the entire groove surface constituting the groove part 12 is formed. May be provided. Moreover, when providing in a part of groove surface, it is possible to provide in various places. For example, as shown in FIG. 4, the linear protrusions 41 and the linear recesses 51 may be provided on the first groove side walls 14a and 14a and the corresponding surfaces 21b. You may provide in the 3rd groove | channel side wall 14c. When it is provided on the second groove side wall 14b, the fitting becomes stronger when the mounting member 20 is about to come off, which is preferable from the viewpoint of preventing the relative movement of the mounting member 20.

  (2) The predetermined direction in which the linear protrusion 41 and the linear recess 51 extend can be variously modified as long as it intersects the tire circumferential direction CD. For example, as shown in FIG. 4, one orthogonal to the tire circumferential direction CD can be mentioned.

  (3) Moreover, in the said embodiment, although the mounting member 20 has comprised cyclic | annular form, circular arc shape may be sufficient. When the mounting member has an arc shape, a plurality of mounting members are preferably provided along the tire circumferential direction. The groove portion 12 and the protrusion 21 may also have an arc shape along the tire circumferential direction.

  (4) Further, in the present embodiment, the protrusion 21 is on the mounting member side and the groove portion 12 is on the tire side wall surface side, but this may be reversed.

  (5) In addition, the position where the mounting member is attached may be any location as long as it is a tire sidewall surface. For example, dressing up may be emphasized by providing the shoulder portion. In order to make the mounting member function as a rim protector as in the present embodiment, it is preferable that the tire side wall surface is within a range of 0 to 50 mm from the contact portion with the rim flange 8a.

  (6) Moreover, in this embodiment, the convex part 40 is provided in both surfaces of the groove bottom face 13 which is a predetermined surface, and its opposing surface 21a, and it is set as the positional relationship which each convex part 40 interferes in the circumferential direction. However, the present invention is not limited to this. That is, a convex portion may be provided only on one of the groove bottom surface which is a predetermined surface and its opposite surface, and a concave portion corresponding to the mating surface may be provided. For example, as shown in FIG. 5, a plurality of dimple-like convex portions (not shown) projecting to the mating surface 21 a are provided on the groove bottom surface 13 which is a predetermined surface among the groove surfaces constituting the groove portion 12. A dimple-like concave portion 52 that interferes with the dimple-like convex portion and the tire circumferential direction CD is provided on the other surface 21a of the dimple-like convex portion. The dimple-like convex portion and the dimple-like concave portion 52 have a partial spherical shape, and preferably have a diameter of φ0.3 mm to φ3.0 mm. Further, the depth of the dimple is preferably 0.15 mm or more.

  (7) Moreover, as shown to Fig.6 (a), you may provide the linear convex part 43 and the linear concave part 53 in the 3rd groove | channel side wall 14c which comprises the groove part 12. FIG. The linear protrusion 43 has an orthogonal surface 43a orthogonal to the tire circumferential direction CD on one side of the tire circumferential direction CD, and an inclined surface 43b inclined with respect to the tire circumferential direction CD on the other side of the tire circumferential direction CD. Have. With this configuration, rotation of the mounting member 20 in one direction of the tire circumferential direction CD is effectively prevented by the orthogonal surface 43a, and rotation of the mounting member 20 in the other direction of the tire circumferential direction CD can be allowed. Therefore, it is possible to achieve both prevention of rotation of the mounting member 20 in one direction of the tire circumferential direction CD and assembling performance.

  (8) In particular, as shown in FIG. 6B, the third groove side wall 14c, which is a predetermined surface, and the facing surface thereof are divided into a plurality of regions Ar1 (Ar2) along the tire circumferential direction CD. The linear protrusion 43 formed in a part of the first region Ar1 has an orthogonal surface 43a orthogonal to the tire circumferential direction on one side (indicated by a counterclockwise arrow) in the tire circumferential direction. On the other hand, the line convex part 43 formed in 2nd area | region Ar2 other than 1st area | region Ar1 among several area | regions makes the orthogonal surface 43a orthogonal to a tire circumferential direction the other side (clockwise rotation) of tire circumferential direction CD. (Shown by arrows). According to this configuration, it is possible to achieve both prevention of rotation of the mounting member 20 in the tire circumferential direction CD in both directions and assembly.

  In order to specifically show the configuration and effects of the present invention, tires of the following examples are mounted on a real vehicle (domestic 3000cc class FR sedan), run on a general road under the load conditions of one passenger, and the mounting member 20 (Ring) rotation (relative movement) and dropout were evaluated. The tire size is 225 / 45R18, and the number of tires evaluated is 24. If the ring (mounting member 20) has moved in the tire circumferential direction by 5 ° or more from the initial position, it is considered to have been rotated. It was considered that.

Comparative Example The mounting member 20 having the cross-sectional projection shown in FIG. 3 was attached to the tire side wall surface in which the cross-sectional groove shown in FIG. 3A was formed. However, the convex part 40 and the recessed part 50 are not formed.

Example 1
The linear protrusion 41 and the linear recess 51 shown in FIG. 4 were provided in the protrusion of the mounting member and the groove on the tire side wall surface of the tire of the comparative example. Other than that, it was the same as the comparative example.

Example 2
For the tire of the comparative example, the line protrusion 41 and the line recess 51 shown in FIG. 3 were provided in the protrusion of the mounting member and the groove on the tire side wall. Other than that, it was the same as the comparative example.

Example 3
For the tire of the comparative example, the dimple-like convex portion shown in FIG. 5 was provided in the groove portion of the tire side wall surface, and the dimple-like concave portion 52 shown in FIG. Other than that, it was the same as the comparative example.

Example 4
For the tire of the comparative example, the linear protrusion 43 and the linear recess 53 shown in FIG. 6 were provided in the protrusion of the mounting member and the groove on the tire side wall. Other than that, it was the same as the comparative example.

  It can be seen that both the number of rotations and the number of dropouts of the ring (mounting member 20) are suppressed in Examples 1 to 4 with respect to the comparative example.

DESCRIPTION OF SYMBOLS 1 ... Bead part 2 ... Side wall part 3 ... Tread part 10 ... Tire side wall surface 12 ... Groove part 13 ... Groove bottom face (predetermined surface)
DESCRIPTION OF SYMBOLS 21 ... Protrusion 20 ... Mounting member 21a ... Opposite surface 40 ... Convex part 41, 43 ... Linear convex part 43a ... Orthogonal surface 43b ... Inclined surface 50 ... Concave part 51, 53 ... Convex concave part RD ... Tire radial direction CD ... Tire circumference Direction Ar1 ... first region Ar2 ... second region

Claims (5)

A pair of bead parts, a sidewall part extending outward in the tire radial direction from each of the bead parts, a tread part connecting the tire radial direction outer ends of the sidewall parts, and the bead part through the sidewall part A pneumatic tire provided with an arcuate or annular mounting member configured to be detachable by a fitting structure of a groove portion and a protrusion extending in the tire circumferential direction with respect to a tire side wall surface reaching the tread portion,
A plurality of convex portions projecting to the mating surface are provided on at least one of the predetermined surfaces of the groove surfaces constituting the groove portion or the opposing surface of the mounting member facing the predetermined surface. A pneumatic tire is provided, wherein a concave portion that interferes with the convex portion in the tire circumferential direction is provided on a surface on the other side of the plurality of convex portions.   A plurality of linear protrusions extending along a predetermined direction are arranged on both the predetermined surface and the opposing surface, and extended along the predetermined direction between the linear protrusions. The pneumatic tire according to claim 1, wherein a linear recess is formed.   The pneumatic tire according to claim 2, wherein the predetermined direction is inclined with respect to the tire circumferential direction.   The said line | wire convex part has an inclined surface which inclines with respect to a tire circumferential direction on the other side of a tire circumferential direction while having the orthogonal surface orthogonal to a tire circumferential direction on one side of a tire circumferential direction. Pneumatic tire described in 2.   When the predetermined surface and the facing surface are partitioned into a plurality of regions along the tire circumferential direction, the linear protrusions formed in some first regions of the plurality of regions are arranged in the tire circumferential direction. While having an orthogonal surface orthogonal to one side in the tire circumferential direction, the linear protrusion formed in a region other than the first region among the plurality of regions has an orthogonal surface orthogonal to the tire circumferential direction. The pneumatic tire according to claim 4, which is provided on the other side in the tire circumferential direction.

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