JP5838703B2 - Stud pin and its mounting method - Google Patents

Description

The present invention relates to a stud pin and a stud tire in which the stud pin is implanted in a tread portion. The present invention relates to a stud pin that makes it possible and a method of attaching the stud pin.

  In severe winter areas such as Northern Europe and Russia, stud tires are mainly used as winter tires. Conventionally, in stud tires, a plurality of implantation holes for embedding stud pins are provided in a tread portion, and stud pins are embedded in these implantation holes (see, for example, Patent Document 1). The implantation hole is usually formed in a cylindrical shape. On the other hand, as the stud pin, a single flange type stud pin having a flange portion swelled from the shank portion on the bottom side of the columnar shank portion, and a stepped side and a bottom side of the columnar shank portion, respectively. There is a double flange type stud pin having a flange portion that swells more than the shank portion.

  The performance of the stud tire is exhibited by the stud pin embedded in the tread portion. However, when the stud pin falls off, the performance on ice becomes conspicuous, and countermeasures against the pin slippage are an important issue. In particular, a stud pin provided with a flange portion that swells more than the shank portion is difficult to drive straight into the implantation hole, and if the stud pin is unstable, the pin is likely to be pulled out.

JP 2010-70052 A

It is an object of the present invention to provide a stud pin and a method for attaching the stud pin that enable a stud pin to be implanted easily and reliably and improve the holding ability of the stud pin.

  In order to achieve the above object, a stud pin of the present invention includes a cylindrical case inserted into a planting hole formed in a tread portion of a tire, a shank portion inserted into the inside of the case, and a tip of the shank portion. A pin body having a protruding tip portion, and a plurality of through holes are provided at arbitrary height positions of the case, and a movable claw extending in the radial direction of the case is inserted into each through hole, and The shank portion is formed so as to become thinner toward the base end side, and a concave portion for engaging the movable claw is provided on a side surface of the shank portion.

The stud pin mounting method of the present invention for achieving the above object is a method of mounting the stud pin to the stud tire, and a plurality of planting holes for planting the stud pin in the tread portion of the stud tire. After implanting the case with the movable claw in these implantation holes, the shank portion of the pin body is inserted inside the case to expand the movable claw radially outward of the case, it is characterized in that the engagement causes the recess of the shank portion on the basis of the reaction force applied to the movable pawl from the inner wall surface of the implantable hole.

  In the present invention, a cylindrical case and a pin body are provided, a plurality of through holes are provided at arbitrary height positions of the case, and a movable claw extending in the radial direction of the case is inserted into each through hole, and the pin A stud pin is used in which the shank portion of the main body is formed so as to become narrower toward the base end side, and a recess for engaging the movable claw is provided on the side surface of the shank portion. And after planting a case with movable claws in the tread hole, the movable claws are expanded radially outside the case by inserting the shank of the pin body inside the case, and these movable claws are implanted. Based on the reaction force received from the inner wall surface of the hole, it is brought into a state of being engaged with the concave portion of the shank portion. Therefore, compared with the case of the conventional stud pin which provided the flange part swollen rather than the shank part, the implantation operation | work of a stud pin can be performed easily and reliably. In addition, since the movable claw bites into the inner wall surface of the implantation hole and at the same time, the movable claw is engaged with the recess of the shank portion based on the reaction force, the stud pin holding ability can be enhanced.

  In the present invention, a plurality of through holes are provided in at least two locations in the height direction of the case, and movable claws are inserted into the respective through holes, and the movable claws are engaged in at least two locations in the height direction of the shank portion. It is preferable to provide the recessed part to be made. Moreover, it is preferable to incline a through-hole with respect to the radial direction of a case so that the inner side edge part of a movable nail | claw is located in the base end side of a case rather than an outer side edge part. Thereby, the holding | maintenance capability of a stud pin can further be improved.

The case of the stud pin which consists of embodiment of this invention is shown, (a) is a top view, (b) is the II arrow sectional drawing. The pin main body of the stud pin which consists of embodiment of this invention is shown, (a) is a top view, (b) is a side view. It is an expanded view which shows the tread pattern (before stud pin implantation) of the stud tire which consists of embodiment of this invention. It is an expanded view which shows the tread pattern (after stud pin implantation) of the stud tire which consists of embodiment of this invention. It is sectional drawing which shows the implantation process of the stud pin which consists of the case of FIG. 1 and the pin main body of FIG. 2, and shows the state of the stud pin in each process (a), (b). The case of the stud pin which consists of other embodiment of this invention is shown, (a) is a top view, (b) is the VI-VI arrow sectional drawing. The case of the stud pin which consists of other embodiment of this invention is shown, (a) is a top view, (b) is the VII-VII arrow sectional drawing. The case of the stud pin which consists of other embodiment of this invention is shown, (a) is a top view, (b) is the VIII-VIII arrow sectional drawing. The case of the stud pin which consists of other embodiment of this invention is shown, (a) is a top view, (b) is the IX-IX arrow sectional drawing. The case of the stud pin which consists of other embodiment of this invention is shown, (a) is a top view, (b) is the XX arrow sectional drawing. The pin main body of the stud pin which consists of other embodiment of this invention is shown, (a) is a top view, (b) is a side view. It is sectional drawing which shows the state which studded the stud pin which consists of a case of FIG. 10 and the pin main body of FIG. 11 in the tread part. The case of the stud pin which consists of other embodiment of this invention is shown, (a) is a top view, (b) is the XIII-XIII arrow sectional drawing. It is sectional drawing which shows the state which studded the stud pin which consists of the case of FIG. 13 and the pin main body of FIG. 2 in the tread part. It is a side view which shows the conventional stud pin.

  Hereinafter, the configuration of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 shows a stud pin case according to an embodiment of the present invention, and FIG. 2 shows a pin body of a stud pin according to an embodiment of the present invention.

  As shown in FIGS. 1A and 1B and FIGS. 2A and 2B, the stud pin 10 of the present embodiment is composed of a cylindrical case 11 and a pin body 12. A plurality of through holes 11a are formed at arbitrary height positions in the axial direction of the case 11, and plate-like movable claws 11b extending in the radial direction of the case 11 are inserted into the through holes 11a. In the present embodiment, four through holes 11 a are evenly arranged in the circumferential direction of the case 11, and four movable claws 11 b corresponding thereto are attached to the case 11. The movable claw 11b is slidably held in the through hole 11a, and can be provided with a stopper for preventing the drop from the through hole 11a as required.

  On the other hand, the pin main body 12 includes a columnar shank portion 12a inserted into the inside of the case 11, and a tip portion 12b protruding from the tip of the shank portion 12a. The tip portion 12b may be formed integrally with the shank portion 12a, or may be embedded in the tip portion of the shank portion 12a as a separate member formed from a material harder than the shank portion 12a. The shank portion 12a is formed so as to become thinner toward the proximal end side. More specifically, a part or the whole of the shank portion 12a is tapered so that the shank portion 12a gradually becomes thinner toward the base end side. And the recessed part 12c which engages the movable nail | claw 11b is formed in the side surface of the shank part 12a. The recess 12c is preferably continuous in the circumferential direction of the shank portion 12a, but may be intermittently disposed at a position corresponding to the movable claw 11b.

  FIG. 3 shows a tread pattern (before stud pin implantation) of the pneumatic tire according to the embodiment of the present invention, and FIG. 4 shows a tread pattern (after stud pin implantation) of the pneumatic tire according to the embodiment of the present invention. It is.

  As shown in FIG. 3, the tread portion 1 is formed with a plurality of vertical grooves 2 extending zigzag in the tire circumferential direction and a plurality of horizontal grooves 3 extending in the tire width direction. Block 4 is partitioned. Each of the blocks 4 is formed with a plurality of sipes 5 extending in a zigzag shape in the tire width direction. Further, a stud 4 implantation hole 6 is formed in the block 4 located on the shoulder side of the tread portion 1. On the other hand, in FIG. 4, stud pins 10 are embedded in the respective implantation holes 6.

  FIG. 5 shows a process of implanting the stud pin 10 composed of the case 11 of FIG. 1 and the pin body 12 of FIG. When the stud pin 10 is implanted in the implantation hole 6 formed in the tread portion 1, first, as shown in FIG. 5A, the case 11 having the movable claw 11b is implanted in the implantation hole 6. At this time, the movable claw 11 b is moved to the inside of the case 11 so as not to protrude from the outer surface of the case 11. Next, as shown in FIG. 5 (b), by inserting the shank portion 12 a of the pin body 12 into the inside of the case 11, the movable claw 11 b is expanded radially outward of the case 11, and the movable claw 11 b is inserted into the implantation hole 6. Encroach into the inner wall. Then, by pushing the shank portion 12a until the position of the recessed portion 12c is the same as the position of the movable claw 11b, the movable claw 11b is engaged with the recessed portion 12c of the shank portion 12a based on the reaction force received from the inner wall surface of the implantation hole 6. Combine.

  When the stud pin 10 described above is used, the operation of implanting the case 11 into the implantation hole 6 is extremely simple, and the operation of inserting the pin body 12 inside the case 11 is extremely simple. Therefore, compared with the case of the conventional stud pin which provided the flange part swollen rather than the shank part, the implantation operation | work of the stud pin 10 can be performed easily and reliably. Moreover, since the movable claw 11b bites into the inner wall surface of the planting hole 6 and the movable claw 11b is engaged with the recess 12c of the shank portion 12a based on the reaction force, the holding ability of the stud pin 10 can be enhanced. it can.

  6 to 14 show the components of a stud pin according to another embodiment of the present invention. 6 to 14, the same components as those in FIGS. 1 and 2 are denoted by the same reference numerals, and detailed description thereof is omitted.

  6 (a) and 6 (b), two through holes 11a are formed in the case 11, and these two through holes 11a are equally arranged in the circumferential direction of the case 11, and two corresponding plate-like holes are formed. A movable claw 11 b is attached to the case 11. The case 11 shown in FIG. 6 can be used together with the pin body 12 shown in FIG.

  7A and 7B, the case 11 has three through holes 11a, and these three through holes 11a are evenly arranged in the circumferential direction of the case 11, and corresponding to the three plate-like shapes. A movable claw 11 b is attached to the case 11. The case 11 shown in FIG. 6 can be used together with the pin body 12 shown in FIG.

  8 (a) and 8 (b), the case 11 has four through holes 11a, and these four through holes 11a are evenly arranged in the circumferential direction of the case 11 and correspond to four rod-shaped movable members. A claw 11 b is attached to the case 11. The case 11 shown in FIG. 8 can be used together with the pin body 12 shown in FIG.

  9 (a) and 9 (b), the case 11 is formed with four through holes 11a, and these four through holes 11a are evenly arranged in the circumferential direction of the case 11, and corresponding four movable claws 11b. Is attached to the case 11. These movable claws 11b have a bent plate shape. The case 11 shown in FIG. 9 can be used together with the pin body 12 shown in FIG.

  10 (a) and 10 (b), a plurality of through holes 11a are formed at two positions in the height direction of the case 11, and a plate-like movable member extending in the radial direction of the case 11 in each through hole 11a. The claw 11b is inserted. More specifically, four through holes 11a are formed at each height position of the case 11, and these four through holes 11a are evenly arranged in the circumferential direction of the case 11, and the eight movable claws 11b corresponding thereto are provided. Attached to the case 11. The case 11 shown in FIG. 10 can be used together with the pin body 12 shown in FIG. As shown in FIGS. 11A and 11B, recesses 12c for engaging the movable claws 11b are formed at two locations in the height direction of the shank portion 12a of the pin main body 12, respectively. In this case, the stud pin 10 is implanted as shown in FIG. Thus, by disposing the movable claws 11b in at least two places in the height direction of the case 11, the holding ability of the stud pin 10 can be further enhanced.

  13 (a) and 13 (b), four through holes 11a are formed in the case 11, and these four through holes 11a are evenly arranged in the circumferential direction of the case 11, and corresponding four movable claws 11b. Is attached to the case 11. More specifically, a structure is adopted in which the through hole 11a is inclined with respect to the radial direction of the case 11 so that the inner end portion of the movable claw 11b is located closer to the base end side of the case 11 than the outer end portion. Yes. The case 11 shown in FIG. 13 can be used together with the pin body 12 shown in FIG. In this case, the stud pin 10 is implanted as shown in FIG. In this way, by tilting the sliding direction of the movable claw 11b with respect to the radial direction of the case 11, the holding ability of the stud pin 10 can be further enhanced.

  In a pneumatic tire having a tire size of 205 / 55R16 and having a plurality of planting holes for embedding stud pins in the tread portion, conventional examples and implementations in which the structure of stud pins implanted in the planting holes are varied. Tires of Examples 1 to 5 were produced.

  In the tire of Example 1, a stud pin composed of the case of FIG. 1 and the pin body of FIG. 2 was used. In the tire of Example 2, a stud pin composed of the case of FIG. 6 and the pin body of FIG. 2 was used. In the tire of Example 3, a stud pin composed of the case of FIG. 9 and the pin body of FIG. 2 was used. In the tire of Example 4, a stud pin composed of the case of FIG. 10 and the pin body of FIG. 11 was used. In the tire of Example 5, a stud pin composed of the case of FIG. 13 and the pin body of FIG. 2 was used.

  In the tire of the conventional example, as shown in FIG. 15, a stud pin 20 having a flange portion that swells more than the shank portion is used.

  For these tires, the stud pin holding ability was evaluated by the following evaluation method, and the results are shown in Table 1.

Stud pin holding capacity:
The test tire in which the stud pin was implanted was mounted on a vehicle with a displacement of 2500 cc class, and the air pressure was 230 kPa. After traveling 10,000 km on a general road, the number of stud pins dropped from the tread portion was counted. The evaluation results are shown as an index with the conventional example being 100, using the reciprocal of the measured value. The larger the index value, the better the stud pin holding ability.

  As is apparent from Table 1, all of the tires of Examples 1 to 5 were superior in stud pin holding ability compared to the conventional example. In the conventional example, the stud pin is not driven straight into the implantation hole and is in an unstable state, so that the pin is easily pulled out. On the other hand, in Examples 1-5, in addition to the excellent retention capability of the stud pins, the stud pin implantation operation was also easy.

DESCRIPTION OF SYMBOLS 1 Tread part 2 Vertical groove 3 Horizontal groove 4 Block 5 Sipe 6 Planting hole 10 Stud pin 11 Case 11a Through-hole 11b Movable claw 12 Pin main body 12a Shank part 12b Tip part 12c Recessed part

Claims (4)

  A cylindrical case to be inserted into the implantation hole formed in the tread portion of the tire, a shank portion inserted into the case, and a pin body provided with a tip portion protruding from the tip of the shank portion; A plurality of through holes are provided at arbitrary height positions of the case, and a movable claw extending in the radial direction of the case is inserted into each through hole, and the shank portion is formed to be narrowed toward the base end side. And the stud pin which provided the recessed part which engages with the said movable nail | claw on the side surface of the said shank part was provided.   A plurality of through holes are provided in at least two locations in the height direction of the case, the movable claws are inserted into the through holes, and the movable claws are engaged in at least two locations in the height direction of the shank portion. The stud pin according to claim 1, wherein a recessed portion is provided.   The said through-hole was made to incline with respect to the radial direction of the said case so that the inner side edge part of the said movable nail | claw may be located in the base end side of the said case rather than an outer side edge part. The listed stud pin. A method for attaching the stud pin according to any one of claims 1 to 3 to a stud tire, wherein a plurality of implantation holes for embedding the stud pin are provided in a tread portion of the stud tire, and the implantation holes are provided with the stud pins. After planting the case with movable claws, the shank portion of the pin main body is inserted into the case to expand the movable claws outward in the radial direction of the case, and the movable claws are inserted into the implantation holes. mounting method for studs, characterized in that cause engagement based on reaction force received from the wall surface in the recess of the shank portion.

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