JP2016078521A - Stud pin and stud tire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain a stable attachment state of a stud pin without rotation.SOLUTION: A stud pin is attached to a pin hole 5 formed on a tread surface. The stud pin comprises a trunk 7, and a flange part 9 formed on one end side of the trunk 7. The flange part 9 includes plural projections 15 in a discontinuous state in a peripheral direction on an annular face 13 on the trunk side. The projections 15 are formed of plural kinds of projections having different radial thickness from each other.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a stud pin and a stud tire.

  Conventionally, as a stud pin, there is one in which a convex portion is provided on an outer edge portion of a flange portion, and the flange portion is anchored to a tread rubber to prevent the collapse (see, for example, Patent Documents 1 and 2).

  However, in the said conventional stud pin, when a convex part is arrange | positioned on the same periphery and it projects in the circumferential direction, these overlap completely. For this reason, the support state in the rotation direction is likely to be insufficient, and it may be rotated by an external force acting during traveling or the like, and may be easily dropped from the tire.

JP 2012-131351 A Japanese Utility Model Publication No. 63-147303

  An object of the present invention is to provide a stud pin capable of maintaining a stable mounting state without rotating, and a stud tire including the stud pin.

As a means for solving the above problems, the present invention provides:
It is a stud pin used by attaching it to a pin hole formed on the tread surface,
The torso,
A collar portion formed on one end side of the body portion;
With
The flange includes a plurality of protrusions that are discontinuous in the circumferential direction on the annular surface on the body side,
The protrusion is configured by a plurality of types having different radial thicknesses, and provides a stud pin.

  With this configuration, when the projections are projected in the circumferential direction, non-overlapping regions that do not overlap each other in the radial direction are formed. Therefore, even when a force that rotates in the circumferential direction is applied with the stud pin mounted on the tire, the rotation can be effectively prevented by the non-overlapping region, and the drop-off from the tire can be effectively prevented. .

  The protrusions preferably have different circumferential lengths of the annular surface.

  It is preferable that the protrusions have different projecting dimensions from the annular surface.

  With this configuration, the non-overlapping region can be further increased, and rotation and dropping off from the tire can be more effectively prevented.

As a means for solving the above problems, the present invention provides:
The tread portion has a pin hole in which the stud pin of any one of the above configurations can be mounted,
A stud tire is provided in which a plurality of recesses in which protrusions of the stud pin are disposed are formed on an inner surface constituting the pin hole.

  According to the present invention, since the plurality of projections having different thicknesses in the radial direction are provided, it is difficult to be displaced in the rotational direction when traveling while being mounted on the tire, and it is possible to effectively prevent the tire from falling off. it can.

It is an expanded view which shows a part of tread surface of the tire which mounts | wears with the stud pin which concerns on this embodiment. (A) is a front view which shows the stud pin of FIG. 1, (b) is the AA sectional view taken on the line. FIG. 3 is a projection view in the circumferential direction of a protrusion formed on the stud pin of FIG. 2. It is sectional drawing of the pin hole of FIG. It is the projection view in the circumferential direction which shows other embodiment of the protrusion formed in the stud pin shown in FIG. It is the projection view in the circumferential direction which shows other embodiment of the protrusion formed in the stud pin shown in FIG. It is the projection view in the circumferential direction which shows other embodiment of the protrusion formed in the stud pin shown in FIG. It is the projection view in the circumferential direction which shows other embodiment of the protrusion formed in the stud pin shown in FIG.

  Embodiments according to the present invention will be described below with reference to the accompanying drawings. In the following description, terms indicating specific directions and positions (for example, terms including “up”, “down”, “side”, “end”) are used as necessary. Is for facilitating understanding of the invention with reference to the drawings, and the technical scope of the present invention is not limited by the meaning of these terms. Further, the following description is merely illustrative in nature and is not intended to limit the present invention, its application, or its use. Furthermore, the drawings are schematic, and the ratio of each dimension is different from the actual one.

  FIG. 1 shows a part of a tread surface 1 of a stud tire according to the present embodiment. In the tread surface 1, main grooves 2 are formed in a plurality of rows in the tire width direction in the tire circumferential direction. Further, on the tread surface 1, lateral grooves 3 are formed in a plurality of rows in the tire circumferential direction in the tire width direction. A plurality of blocks 4 are defined by the main grooves 2 and the lateral grooves 3. A pin hole 5 (see FIG. 4) is appropriately formed in the block 4. A stud pin 6 is attached to each pin hole 5.

  The stud pin 6 is formed by forming aluminum, an aluminum alloy or the like. As shown in FIG. 2, the stud pin 6 is formed in the body portion 7, the narrow neck portion 8 that continues to the lower side thereof, the flange portion 9 (pedestal) that continues further to the lower side, and the central portion of the upper surface of the body portion 7. It is comprised by the protrusion 10 made.

  The body portion 7 has a substantially columnar shape or a substantially quadrangular prism shape, and is formed with inclined surfaces 12a and 12b that gradually decrease in outer diameter size in the protruding direction above and below the outer surface 11, respectively. The outer diameter of the outer side surface 11 is sufficiently larger than the inner diameter of the pin hole 5 and is about twice as large here.

  The collar portion 9 has a larger diameter than the body portion 7, an annular surface 13 is formed on the narrow neck portion 8 side, and a conical surface 14 whose outer diameter gradually decreases toward the lower end surface on the lower half portion. Has been. A plurality of protrusions 15 that are discontinuous and have different radial width dimensions are formed on the annular surface 13 on the same circumference. Here, each protrusion 15 has the same height dimension, has a predetermined length in the circumferential direction, and is arranged in four equal parts. FIG. 3 is a projection view in which the protrusion 15 is projected in the circumferential direction. Of the four protrusions 15, the first protrusion 16 disposed at one of the diagonal positions is formed to have a larger width dimension than the second protrusion 17 disposed at the other diagonal position. Has been. Thereby, when projected in the circumferential direction, a non-overlapping region (indicated by hatching with a two-dot chain line in FIG. 3) protruding from the second protrusion 17 on both sides is obtained on the first protrusion 16.

  As shown in FIG. 4, the pin hole 5 in which the stud pin 6 is mounted includes a retaining portion 18 and an enlarged portion 19 that constitutes the bottom portion thereof. The entrance portion of the retaining portion 18 is tapered so that the stud pin 6 can be easily inserted. The enlarged portion 19 has an inner surface that swells in a circular arc shape. A first recess 20 and a second recess 21 are formed in the enlarged portion 19 at positions corresponding to the first protrusion 16 and the second protrusion 17, respectively. The first recesses 20 are juxtaposed in the tire circumferential direction, and the second recesses 21 are juxtaposed in the tire width direction. Note that the retaining portion 18 and the enlarged portion 19 are inflated when the stud pin 6 is attached.

  Although all the protrusions 15 are projected from the same circumference of the annular upper surface 13, the protruding positions may be displaced in the radial direction. For example, as shown in FIG. 5, the position of the first protrusion 16 can be shifted to the inner diameter side, and the second protrusion 17 can be shifted to the outer diameter side.

  Moreover, although the said protrusion 15 was made to differ in a width dimension, as shown in FIG. 6, you may make it make the protrusion dimension (height) from the annular surface 13 differ. That is, by making the width dimension of the first protrusion 16 and the second protrusion 17 the same, and making the protrusion dimension of the first protrusion 16 larger than the protrusion dimension of the second protrusion 17, the second protrusion 17 A non-overlapping region can be obtained at a higher portion. A first recess 20 and a second recess 21 having different depths are formed on the tire side in accordance with the first and second protrusions 16 and 17 having different protrusion dimensions. Thereby, in the deep part which entered inside from the tread surface 1 of the tire, the second recess 21 does not exist in the circumferential direction of the first recess 20, and the position sufficient when the rotational force acts on the stud pin 6. Demonstrate the effect of slipping.

  Further, although the protrusion 15 has either a width dimension or a protrusion dimension different from each other, the circumferential length (circumferential dimension) may be different as shown in FIG. That is, the circumferential length of the first protrusion 16 is made longer than that of the second protrusion 17. Thereby, when it mounts | wears with a tire, the contact area of the 1st protrusion 16 and the 1st recessed part 20 can be enlarged, and a holding state can be stabilized.

  Furthermore, although the protrusion 15 has a width dimension, a protrusion dimension, or a circumferential dimension different from each other, as shown in FIG. 8, both the width dimension and the protrusion dimension may be different. . That is, by making the width dimension and protrusion dimension of the first protrusion 16 larger than those of the second protrusion 17, a non-overlapping region can be obtained in both the width direction and the protrusion direction. A first recess 20 and a second recess 21 having different widths and depths are formed on the tire side in accordance with the first and second protrusions 16 and 17 having different width dimensions and protrusion dimensions, respectively. As a result, the second recess 21 does not exist in the circumferential direction of the first recess 20 in both the width direction and the depth direction of the tire, and a sufficient misalignment occurs when a rotational force acts on the stud pin 6. Demonstrate the prevention effect.

  Using tires with a tire size of 195 / 65R15, repeatedly turning, braking and starting, PIN rotation suppression performance (rotation angle from the normal mounting position of the stud pin 6) and PIN removal performance (number of dropped stud pins 6) Was evaluated. In the comparative example 1, the stud pin 6 in which the protrusion 15 is not formed in the collar part 9 was used. In Example 1, the stud pin 6 having two types of protrusions 15 having different width dimensions shown in FIG. 3 was used. In Example 2, the stud pin 6 having two types of protrusions 15 having different width dimensions and circumferential length dimensions (circumferential dimensions) shown in FIG. 7 was used. In Example 3, the stud pin 6 having two types of protrusions 15 having different width dimensions, circumferential dimensions, and protruding dimensions shown in FIG. 8 was used. The results of the evaluation test are as shown in Table 1.

PIN回転抑制性能（スタッドピン６の回転角度θ）
×：９°≦θ
△：６°≦θ＜９°
○：３°≦θ＜６°
◎：θ＜３°
PIN抜け性能（スタッドピン６の抜け個数ｘ）
×：８≦ｘ
△：５≦ｘ＜８
○：２≦ｘ＜５
◎：ｘ＜２

PIN rotation suppression performance (rotation angle θ of stud pin 6)
×: 9 ° ≦ θ
Δ: 6 ° ≦ θ <9 °
○: 3 ° ≦ θ <6 °
A: θ <3 °
PIN removal performance (Stud pin 6 removal x)
×: 8 ≦ x
Δ: 5 ≦ x <8
○: 2 ≦ x <5
A: x <2

  As shown in Table 1, in Comparative Example 1, the PIN rotation suppression performance was 9 ° or more, and the PIN removal performance was 8 or more. On the other hand, in Example 1, the PIN rotation suppression performance is 6 ° or more and less than 9 °, the PIN removal performance is 2 or more and less than 5, and in Example 2, the PIN rotation suppression performance is 3 ° or more and less than 6 °, The PIN removal performance was 2 or more and less than 5, and in Example 3, the PIN rotation suppression performance was less than 3 °, and the PIN removal performance was less than 2. That is, it has been clarified that any performance is improved as the non-overlapping region when the projection 15 is projected in the circumferential direction is increased.

  In addition, this invention is not limited to the structure described in the said embodiment, A various change is possible.

  For example, in the above-described embodiment, it has been mentioned that the position provided in the radial direction can be freely set only when the width dimension of the protrusion 15 is different. However, when only the protrusion dimension is different, or the width dimension is different. Similarly, in any case where both the projecting dimensions and the projecting dimensions are different, the positions provided in the radial direction can be freely changed.

  Moreover, in the said embodiment, although the protrusion 15 was provided in four places equally in the circumferential direction of the annular surface 13, it is not necessarily limited to four places, The number can be changed freely. In the case of providing an even number, the one located at the diagonal position may have the same shape, and the one located next to the other may have a different shape. However, if the relationship between adjacent ones is different, the combination of the shapes is free.

DESCRIPTION OF SYMBOLS 1 ... Tread surface 2 ... Main groove 3 ... Lateral groove 4 ... Block 5 ... Pin hole 6 ... Stud pin 7 ... Trunk part 8 ... Narrow neck part 9 ... Girder part 10 ... Projection part 11 ... Outer surface 12a, 12b ... Inclined surface 13 Annular surface 14 ... conical surface 15 ... projection 16 ... first protrusion 17 ... second protrusion 18 ... prevention receiving portion 19 ... enlarged portion 20 ... first recess 21 ... second recess

Claims (4)

It is a stud pin used by attaching it to a pin hole formed on the tread surface,
The torso,
A collar portion formed on one end side of the body portion;
With
The flange includes a plurality of protrusions that are discontinuous in the circumferential direction on the annular surface on the body side,
The stud is formed of a plurality of types having different radial thicknesses.   The stud pin according to claim 1, wherein the protrusions have different circumferential lengths of the annular surface.   3. The stud pin according to claim 1, wherein the protrusions have different projecting dimensions from the annular surface. The tread portion has a pin hole into which the stud pin according to any one of claims 1 to 3 can be attached,
A stud tire characterized in that a plurality of recesses in which protrusions of the stud pin are arranged are formed on an inner surface constituting the pin hole.

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