JP6420111B2 - Stud pin and stud tire - Google Patents

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 the outer pin is rotated by an external force acting during traveling, etc., and the circumferential position of the stud pin is not the target position, or the stud pin is removed from the tire. There is a risk of falling off easily.

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 collar portion includes a plurality of protrusions that are discontinuous in the circumferential direction on the annular upper surface on the trunk portion side,
The protrusion is configured by a plurality of types having a non-overlapping region that does not overlap each other when projected in the circumferential direction.

  With this configuration, even when a force that rotates in the circumferential direction is applied to the tire, rotation can be effectively prevented by the non-overlapping region.

  It is preferable that the protrusions have different protruding directions from the annular upper surface.

  With this configuration, a non-overlapping region can be secured on the protrusion in a narrow region called the annular upper surface of the collar portion.

  It is preferable that the protrusions are composed of an even number of protrusion directions that are alternately different between the outer diameter side and the inner diameter side.

  With this configuration, the protrusions sequentially arranged in the circumferential direction always have non-overlapping regions, and can be reliably prevented from rotating with a simple configuration.

  It is preferable that the protrusion is formed by an arc-shaped protrusion having a predetermined length in the circumferential direction, provided for each quarter of the annular upper surface in the circumferential direction.

  With this configuration, it is possible to sufficiently prevent the rotational movement by sufficiently increasing the rigidity of the protrusion itself.

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.

The stud pin protrusion is disposed at least at a diagonal position, and has an outer diameter side inclined protrusion protruding toward the outer diameter direction,
It is preferable that the recessed part formed in the inner surface which comprises the said pin hole has an outer diameter side inclination recessed part which is formed in the tire circumferential direction, respectively, and the said outer diameter side inclination protrusion is each arrange | positioned.

  With this configuration, it is possible to effectively prevent the stud pin from dropping out of the pin hole, both during traveling and during braking.

  According to the present invention, since the circumferential non-overlapping region is provided between the protrusions, it is possible to effectively prevent the rotation of the stud pin in a state where the stud pin is mounted on the tire. As a result, the peripheral position (orientation) of the stud pin in the circumferential direction can be made appropriate to achieve the target performance, or the fall off from the tire can be effectively prevented to realize a stable mounting state. It becomes possible.

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 circumferential projection of a protrusion formed on the stud pin of FIG. 2. (A) is sectional drawing of the pin hole of FIG. 1, (b) is the circumferential direction projection figure in the recessed part. It is the circumferential direction projection view of the protrusion formed in the stud pin concerning other embodiments. It is a top view which shows the collar part of the stud pin which concerns on other embodiment.

  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 polygonal column shape (for example, a quadrangular prism shape), and inclined surfaces 12a and 12b are formed on the upper and lower sides of the outer surface 11 so that the outer diameter dimension gradually decreases in the protruding direction. . 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 flange portion 9 has a larger diameter than the body portion 7 , an annular upper surface 13 is formed on the narrow neck portion 8 side, and the lower half portion is configured by a conical surface 9 a whose outer diameter dimension gradually decreases toward the lower end surface. ing. A plurality of protrusions 14 that are discontinuous and have different projection angles are formed on the annular upper surface 13 on the same circumference. Here, each protrusion 14 has the same height dimension, has a predetermined length in the circumferential direction, and is arranged in four equal parts. Of the four protrusions 14, the first protrusion 15 disposed at one of the diagonal positions is inclined toward the inner diameter side, and the second protrusion 16 disposed at the other diagonal position is inclined toward the outer diameter side. ing. Each protrusion has an inclination angle of 60 ° with respect to the annular upper surface 13. FIG. 3 is a projected view of the first ridge 15 and the second ridge 16 in the circumferential direction. As is apparent from this figure, a sufficient non-overlapping region (hatched portion in FIG. 3) is formed between the first protrusion 15 and the second protrusion 16. Therefore, when the tire is inserted into the pin hole 5 of the tire as will be described later, the rubber in the tread portion in the non-overlapping region between the first protrusion 15 and the second protrusion 16 effectively prevents the rotational displacement. can do.

  As shown in FIG. 4, the pin hole 5 in which the stud pin 6 is mounted includes a retaining portion 17 and an enlarged portion 18 constituting the bottom portion thereof. The entrance portion of the retaining portion 17 expands in a tapered shape so that the stud pin 6 can be easily inserted. The enlarged portion 18 has an inner surface that swells in a circular arc shape in cross section. The retaining portion 17 and the enlarged portion 18 are inflated when the stud pin 6 is attached.

  A first recess 19 and a second recess 20 are formed in the enlarged portion 18 at positions corresponding to the first and second protrusions 15 and 16 formed on the flange 9 of the stud pin 6. FIG. 4 shows a state before the enlarged portion 18 is inflated.

  In FIG. 4, the first recess 19 is inclined toward the inner diameter side with respect to the vertical line, and the second recess 20 is inclined toward the outer diameter side. The first recess 19 is in a state in which the stud pin 6 is attached to the pin hole 5, and the inclination angle thereof matches the inclination direction of the first protrusion 15. Moreover, the 2nd recessed part 20 corresponds with the inclination-angle of the 2nd protrusion 16 (that is, the 2nd recessed part 20 turns into an outer diameter side inclined recessed part). Thereby, on the tire side, the first recessed portion 19 and the second recessed portion 20 can be arranged so that the non-overlapping area when projected in the circumferential direction of the stud pin 6 attached to the pin hole 5 is increased. That is, when a rotational force is applied to the stud pin 6, the rotation can be effectively prevented.

  Moreover, the 1st recessed part 19 is facing the width direction of a tire, and the 2nd recessed part 20 is facing the circumferential direction of a tire. Accordingly, even when force is applied to the stud pin 6 from the road surface at the start of traveling and braking, the second protrusion 16 extending in the same direction can be supported by the second recess 20 extending in the outer diameter direction. Therefore, it is difficult for the second protrusion 16 to fall off. Therefore, pin omission can be effectively prevented.

  Although all the protrusions 14 are projected from the same circumference of the annular upper surface 13, the protruding positions may be shifted in the radial direction. For example, as shown in FIG. 5, the position of the first protrusion 15 can be shifted to the inner diameter side, and the second protrusion 16 can be shifted to the outer diameter side. In this case, the first ridge 15 and the second ridge 16 do not necessarily need to be inclined and can be parallel to the axis of the stud pin 6.

  Using tires with a tire size of 195 / 65R15, turning, braking, and starting were repeated, and PIN missing evaluation was performed. In the comparative example 1, the stud pin 6 in which the protrusion 14 is not formed on the flange portion 9 is used. In Example 1, as shown in FIG. 2, the stud pin 6 having two sets of protrusions 14 inclined toward the inner diameter side and the outer diameter side is used for the flange portion 9. In Example 2, as shown in FIG. 5, the stud pin 6 having two sets of protrusions 14 on the different circumferences of the collar portion 9 is 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＜未満
○：３°≦θ＜６°
◎：θ＜３°
PIN抜け性能（スタッドピン６の抜け個数ｎ）
×：８≦ｎ
△：５≦ｎ＜８
○：２≦ｎ＜５
◎：ｎ＜２

PIN rotation suppression performance (rotation angle θ of stud pin 6)
×: 9 ° ≦ θ
Δ: 6 ° ≦ θ <less than ○: 3 ° ≦ θ <6 °
A: θ <3 °
PIN removal performance (number of removal of stud pins 6)
×: 8 ≦ n
Δ: 5 ≦ n <8
○: 2 ≦ n <5
A: n <2

  As is clear from Table 1, in Comparative Example 1, the pin rotation after running was 9 ° or more, and pin omission occurred at 8 or more locations, but in Examples 1 and 2, less than 6 °, 5 locations I was able to keep it below. In particular, in Example 1, it could be suppressed to less than 3 ° and 2 or less. In addition to simply making the protruding direction of the protrusion 14 the axial center direction of the stud pin 6, it is possible to exert a further preventing effect by inclining.

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

  In the above embodiment, the inclination angle of the protrusion 14 from the annular upper surface 13 is 60 °, but it can be freely set as long as it does not overlap when projected in the circumferential direction. This is the same even when the position of the annular upper surface 13 from which the protrusion 14 protrudes is not on the same circumference, and the inclination angle can be freely set.

In the above-described embodiment, the number of the protrusions 14 is four. However, as long as it is an even number, it may be 6, 8, or the like. For example, as shown in FIG. 6, the projections 14 at six locations equal intervals in the annular upper surface 13 of the flange 9 is provided, the inclination angle against the annular upper surface 13 of each projection 14, 90 °, 60 ° on the inner diameter side, You may make it be 60 degrees on the outer diameter side. Further, the number of protrusions 14 may be an odd number. In this case, when the projections adjacent to each other are projected in the circumferential direction by changing the inclination angle between the projections 14 sequentially arranged in the circumferential direction or shifting the protruding position from the annular upper surface 13. A non-overlapping region may be formed.

  In the above embodiment, the protrusion dimension of the protrusion 14 from the annular upper surface 13 (the distance to the most protruded position of the protrusion 14) and the radial width dimension are the same, but by projecting them in the circumferential direction by making them different. A non-overlapping region may be formed. The projecting dimension and the width dimension may be different from each other independently, but both may be different, and the inclination angle may be different.

  In the above-described embodiment, the inclination direction of the protrusions 14 is the inner diameter side and the outer diameter side. However, all the protrusions 14 can be inclined in the outer diameter direction. In this case, it is preferable to shift the protruding position of the protrusion 14 in the radial direction. According to this, the protrusion 14 located not only in the tire circumferential direction but also in the width direction can be projected toward the outer diameter direction. Therefore, not only at the start of running and braking, but also when a load from the side acts on the stud pin 6 at cornering, it can function effectively so as to prevent the dropout.

DESCRIPTION OF SYMBOLS 1 ... Tread surface 2 ... Main groove 3 ... Horizontal groove 4 ... Block 5 ... Pin hole 6 ... Stud pin 7 ... Trunk part 8 ... Narrow neck part 9 ... Girder part 10 ... Protrusion part 11 ... Outer surface 12 ... Inclined surface 13 ... Annular upper surface DESCRIPTION OF SYMBOLS 14 ... Protrusion 15 ... 1st protrusion 16 ... 2nd protrusion 17 ... Stop receiving part 18 ... Enlarged part 19 ... 1st recessed part 20 ... 2nd recessed part (outer diameter side inclined recessed part)

Claims (6)

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 collar portion includes a plurality of protrusions that are discontinuous in the circumferential direction on the annular upper surface on the trunk portion side,
The stud is constituted by a plurality of types having a non-overlapping region that does not overlap each other when projected in the circumferential direction.   The stud pin according to claim 1, wherein a protrusion direction of the protrusion differs from the annular upper surface.   3. The stud pin according to claim 2, wherein the protrusion is configured by an even number in which a protruding direction is alternately different between an outer diameter side and an inner diameter side.   4. The stud pin according to claim 3, wherein the protrusion is provided for each quarter section of the annular upper surface in the circumferential direction, and is configured by an arc-shaped protrusion having a predetermined length in the circumferential direction. The tread portion has a pin hole into which the stud pin according to any one of claims 1 to 4 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. The stud pin protrusion is disposed at least at a diagonal position, and has an outer diameter side inclined protrusion protruding toward the outer diameter direction,
The concave portion formed in the inner surface constituting the pin hole has an outer diameter side inclined concave portion that is formed in a tire circumferential direction and in which the outer diameter side inclined protrusion is respectively disposed. Stud tire.

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