JP2994603B2 - Tire with pin device and pin device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tire having a pin device protruding from a tread surface of a tire, and a pin device used for the tire. More specifically, a pin made of a synthetic resin can prevent the generation of asphalt dust. The present invention relates to a tire with a pin device and a pin device.

[0002]

2. Description of the Related Art At present, the use of spiked tires is banned due to regulations on the prevention of dust generation, and the number of drivers shifting from spiked tires to studless tires is increasing even in cold regions. . However, although conventional studless tires have improved braking performance due to repeated improvements, they cannot still exert sufficient grip on frozen roads, which can lead to the occurrence of slip accidents, The ban on the use of spiked tires has been taken seriously in cold climates.

[0003]

Conventionally, many spike devices have been invented in place of metal pins of spiked tires in view of the above circumstances, but most of them hit hard spike pins such as metal and ceramics on the road surface. In this case, since it exerts a grip force, the dust is only reduced, and the generation of dust cannot be fundamentally prevented.

For example, in a conventional spike device, when a spike pin collides with a road surface, the spike pin is elastically immersed toward the inside of the pin mounting hole, so that the spike pin contacts the road surface. The invention has been invented to reduce the impact at the time of dusting to reduce the generation of dust (Japanese Patent Application Laid-Open Nos. 62-18307 and 62-22780).
No. 5).

However, in the spike tire equipped with the above-described spike device, an elastic buffer such as a liquid or a coil spring is provided in a base end side space of the pin fitted in the pin mounting hole so that the pin can be protruded and retracted. Although it is supported, it is necessary to enclose liquid in addition to the pedestal of the pin and to install a spring in order to support the pin so that it can come and go, so the number of parts increases and the structure and manufacturing process become complicated. , Leading to a rise in manufacturing costs.

On the other hand, there is an idea to prevent the generation of dust by using a relatively soft pin such as a synthetic resin in place of the metal pin. However, the pin made of the synthetic resin is early due to an impact at the time of grounding. Since it was worn, it had not yet reached the level of practical use.

An object of the present invention is to prevent the generation of dust by using a synthetic resin pin as the spike pin, to avoid the premature wear of the synthetic resin spike pin, and to obtain good grip characteristics. It is to provide a function rationally at low cost.

[0008]

In order to solve the above-mentioned problems, a tire with a pin device according to the present invention comprises a movable pin made of a synthetic resin material softer than an asphalt road surface and harder than a frozen road surface; A pin device is constituted by a pedestal that integrally attaches and supports the pin and an elastically deformable portion that elastically deforms as a part of the pedestal and supports the movable pin so that the movable pin can be protruded and retracted. Each of the pin devices is fitted into the mounting hole which is recessed at an appropriate interval from the pedestal side, and the tip end of the movable pin of these pin devices is projected from the tire dread surface.

According to the above means, the pin device is constituted by the movable pin, the pedestal for integrally attaching and supporting the movable pin, and the elastically deformable portion which is elastically deformed as a part of the pedestal. The pin device is fitted in a mounting hole recessed in a tread surface of a tire from a pedestal side, and is mounted with a movable pin tip end protruding from the tire tread surface.

When the pin device is grounded during traveling, a load is applied such that the movable pin is pushed into the mounting hole. Due to this load, the elastically deformable portion is elastically deformed as a part of the pedestal, so that the movable pin enters the mounting hole. Further, when the pin device is separated from the road surface, the elastically deformed portion is restored to the original state, and the movable pin that has been immersed in the mounting hole projects from the tire tread surface.

The movable pin is made of a synthetic resin material that is softer than the asphalt road surface and harder than the frozen road surface. Therefore, when the traveling road surface is frozen, the movable pin is pushed into the mounting hole, and at the same time, the movable pin bites into the frozen road surface by the reaction force to exert a grip force. Further, when asphalt is exposed on the traveling road surface, the movable pin collides with the asphalt surface, and at the same time, the elastic deformation portion is elastically deformed, so that the movable pin enters the mounting hole, and the movable pin is Absorbs the impact force it receives.

Further, the tire with a pin device according to claim 2 of the present invention comprises a movable pin made of a synthetic resin material which is softer than an asphalt road surface and harder than a frozen road surface;
A pin device is constituted by a pedestal for mounting and supporting the movable pin, and an elastically deformable portion integrally formed around the movable pin mounting portion of the pedestal and elastically deformable to elastically deform and support the movable pin so as to be able to come and go. The pin devices are fitted into the mounting holes formed in the tire tread surface at appropriate intervals by being recessed from the pedestal side, and the movable pin tips of these pin devices are projected from the tire tread surface.

As described above, the elastically deformable portion integrally formed around the pin mounting portion of the pedestal is elastically and flexibly deformed by the load received via the movable pin, and supports the movable pin so that it can move in and out. The pin device is fitted in a mounting hole recessed in a tread surface of a tire from a pedestal side, and is mounted with a movable pin tip end protruding from the tire tread surface.

When the pin device contacts the ground during traveling, a load is applied such that the movable pin is pushed into the mounting hole. Due to this load, the elastically deformable portion formed around the movable pin mounting portion of the pedestal is elastically and flexibly deformed, and the movable pin is immersed in the mounting hole. When the pin device is separated from the road surface, the deformed elastically deformed portion returns to its original state, and the movable pin that has been immersed in the mounting hole projects from the tire tread surface.

The movable pin is made of a synthetic resin material which is softer than the asphalt road surface and harder than the frozen road surface. Therefore, when the traveling road surface is frozen, the movable pin is pushed toward the inside of the mounting hole by the deformation of the elastic deformation portion, and at the same time, the movable pin bites into the frozen road surface by the reaction force to exert a gripping force. When the asphalt is exposed on the traveling road surface, the movable pin collides with the asphalt surface, and at the same time, the elastically deforming portion of the pedestal is elastically deformed. The impact force received is absorbed.

In the tire with the pin device described above, the movable pin may be detachably attached to the pedestal and supported. In this case, it is possible to remove the movable pin from the pedestal and attach it to the opposite seat while the pin device is mounted in the mounting hole in the tire tread surface. That is, the movable pin can be replaced.

In the tire with the pin device, it is preferable to provide an extension portion extending along the outer peripheral portion of the pedestal in the direction in which the movable pin projects. According to the above-described means, in a state where the pin device is fitted into the mounting hole of the tire tread surface, the rubber pressure at which the extending portion extending along the outer peripheral portion of the base is pressed against the movable pin from the periphery is reduced. As a result, the frictional resistance generated when the movable pin moves in and out can be reduced.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. 1 to 3 show a tire with a pin device embodying the present invention. The tire with the pin device is a tire b composed of a studless tire.
A mounting hole c is recessed in the tread surface b1, and a pin device a is fitted and mounted in each of the mounting holes c. FIG. 1 shows the tread surface b1 of the tire b.
It is expressed as if two pin devices a were attached to the tire, but actually, as in a normal spy tire, many pin devices a were scattered along the tread surface b1 on the outer periphery of the tire b. It is to be attached.

The pin device a includes a movable pin 2 made of synthetic resin.
And a pedestal 1 to which the movable pin 2 is attached and supported. The movable pin 2 is a pin formed in a so-called macaroni pin shape, and has a pin 2a formed in a short cylindrical shape with a flat end, and a male screw portion 2b formed integrally with a lower end of the pin 2a.
It is comprised by these. The male screw portion 2b is for screwing into the female screw 11 of the pedestal 1 mounting portion 1b described later.

The movable pin 2 is formed using a synthetic resin having a predetermined hardness. The movable pin 2 is made of a synthetic resin that is softer than a pavement road surface such as a dry asphalt road surface or a concrete road surface and harder than a frozen road surface d ′ covered by an ice layer. More specifically, the movable pin 2 is made of a synthetic resin suitable for the hardness range described above, for example, a urethane resin, a high heat resistant thermoplastic engineering plastic, a so-called PEEK material, or the like.

In general, the hardness of a pavement road surface such as asphalt or concrete has a shore altitude of 98-10.
About 0. Further, the hardness of the frozen road surface d ′ is Shore hardness 90 to
It is about 93. Therefore, as the synthetic resin constituting the movable pin 2, a resin having a Shore hardness in the range of 90-100 or 93-98 is used. By the way,
Good test results were obtained by using a movable pin 2 having a Shore hardness of 94 to 98 in this example. As the material of the movable pin, any synthetic resin may be used as long as the surface hardness is within the above-described range.
Further, the shape of the movable pin may be arbitrarily changed. For example, the movable pin may be formed in a solid cylindrical shape or a truncated cone shape at the tip.

On the other hand, the pedestal 1 to which the movable pin 2 is attached and supported is integrally formed of a synthetic resin which is appropriately elastically deformed, for example, urethane resin. The pedestal 1 is configured by integrally connecting a ring-shaped outer peripheral portion 1a and a mounting portion 1b provided at a central portion via a substantially plate-shaped elastic deformation portion 3.

The mounting portion 1b is for screwing and supporting the external thread portion 2b of the movable pin 2 and is formed in a substantially short cylindrical shape.
A female screw portion 11 for screwing b is formed, and is provided in a state where the axis is aligned with the center of the pedestal. Outer peripheral portion 1a of base 1
Is formed in a ring shape having a slight height, and the lower edge is bent inward. The outer diameter of the pedestal 1 in this embodiment is 10 to 11 mm, but the dimensions, outer shape, and the like of the pedestal 1 may be arbitrarily changed. In addition, the pedestal 1
May be formed using a metal, FRP, or the like, in addition to the synthetic resin, as long as it can be appropriately elastically deformed.

The outer peripheral portion 1a of the pedestal 1 and the mounting portion 1b
Are integrally connected by an elastic deformation portion 3.
The elastically deformable portion 3 supports the movable pin 2 mounted and supported on the mounting portion 1b so as to be able to protrude and retract, and is configured to surround the periphery of the mounting portion 1b. The elastically deforming portion 3 is formed in a substantially thin plate shape, is divided into three pieces in the circumferential direction through a lightening hole 16, and supports the mounting portion 1b at the center thereof. That is, the elastic deformation part 3 is integrally formed as a part of the pedestal 1.

The elastically deforming portion 3 is formed so as to be inclined upward from the outer peripheral portion 1a of the pedestal 1 toward the mounting portion 1b at the center (FIG. 1A). Elastic deformation part 3
When a load that pushes the movable pin 2 and the mounting portion 1b is applied, the flexible pin is uniformly deformed and deformed, and is folded back to the back of the pedestal 1, that is, the center side of the tire b. 1b is configured to be retracted along the axis of the pedestal 1 (FIG. 1B). When the above-mentioned load is released, the elastically deformable portion 3 returns to its original shape so as to rebound, and the elastically deformable portion 3 is returned to its original shape.
Project again (FIG. 1-a).

Although the elastically deformable portion 3 of the above embodiment is divided into three by forming a lightening hole 16, the number of divided elastically deformable portions is not limited to two.
One or more pieces may be divided. The elastic deformation portion may be configured to surround the entire periphery of the mounting portion 1b without being divided. It is also optional to form a rib, a lightening hole or the like in the elastically deformable portion, and the shape of the elastically deformable portion may be arbitrarily changed.

The pin device a configured as described above is fitted into the mounting hole c which is recessed at regular intervals along the tread surface b1 of the tire b. The mounting hole c is the base 1
The pin device a forcibly expands the mounting hole c and fits in from the pedestal 1 side. In the pin device a fitted into the mounting hole c, the pedestal 1 is completely housed in the mounting hole c, and the tip of the movable pin 2 is
(See FIG. 1).
a). In the case of the present embodiment, the movable pin 2 is set so that the tip end protrudes 1 mm to 2 mm from the tire tread surface b1.

Next, the operation of the tire b with the pin device having the above-described configuration when the tire travels on the dry asphalt road surface d and the frozen road surface d 'will be described. During traveling, when the above-described tire with a pin device rotates and moves on an asphalt road surface d, the distal end portions of the movable pins 2 of the pin devices a projecting from the tire tread surface b1 sequentially collide with the asphalt road surface d. At this moment, the movable pin 2 is pushed into the mounting hole c by the collision force with the road surface d. At the same time, the elastic deformation portion 3 supporting the mounting portion 1b is folded back toward the back of the pedestal 1, and the movable pin 2 is attached to the mounting hole c.
Immerse into the inside (FIG. 1-b). At this time, the movable pin 2 collides with the asphalt road surface d. However, as described above, the movable pin 2 is made of a synthetic resin softer than the asphalt road surface d. There is no need to worry.

As described above, when the movable pin 2 collides with the asphalt road surface d, the elastic deformation of the elastic deformation portion 3 causes
When the movable pin 2 is pushed into the mounting hole c, the impact force applied to the movable pin 2 at the time of touching the ground can be absorbed by the elastic deformation of the elastic deformation portion 3, so that the abrasion of the tip of the movable pin 2 is effectively performed. Can be prevented.

By the way, when a spike pin formed of the same material as that of the movable pin is mounted on a tire with a mounting structure similar to that of a conventional metal spike, the impact force at the time of contact with the ground is directly applied to the spike pin. Because of the action, wear is severe and the required grip force cannot be maintained for a traveling distance of 500 km or more. However, in the pin device a, since the wear of the movable pin 2 is effectively reduced,
The usable mileage can be greatly extended. When the pin device a is released from the contact pressure with the asphalt road surface d, the elastic deformation portion 3 is restored to its original shape so as to rebound, and accordingly, the tip of the movable pin 2 is moved to the tire tread surface b1. Protrude from again. In addition, with the long-term use, the elastic deformation portion 3 may be fatigued and the resilience may decrease, but the necessary resilience may be maintained by applying a tire pressure to the pin device a from the periphery. it can.

When the tire with the pin device a travels on a frozen road surface d ', when the tip of the movable pin 2 collides with the frozen road surface d', the movable pin 2 is harder than the frozen road surface d '. No. 2 penetrates into the frozen layer on the road surface to obtain a good grip force (FIG. 1-c).

At this time, the movable pin 2 is somewhat pushed into the mounting hole c by the elastic deformation portion 3 of the pedestal 1 being flexibly deformed, but is pushed back by the repulsive force of the elastic deformation portion 3. In this case, the gripping force is further improved, and the gripping force is further improved. Also,
The pin device a used in the tire with the pin device described above is easily rotated while being fitted in the mounting hole c by inserting a tool into the hole 5 having a rectangular cross section formed in the tip end surface of the movable pin 2. Thus, it can be attached to and detached from the pedestal 1.

Although the pin device a is configured so that the male screw portion 2b of the movable pin 2 is screwed into the female screw portion 11 of the mounting portion 1b of the pedestal 1, the relationship between the male screw and the female screw is set. May be reversed. That is, a male screw part is provided on the base,
A female screw portion may be provided on the movable pin and screwed together. The above-described pin device a is configured to be detachable by screwing the movable pin 2 to the attachment portion 1b of the pedestal 1. However, the pin device a is configured to detachably attach the movable pin to the attachment portion of the pedestal. The structure is not limited to the screwing with the above-described screws, and any existing structure may be used. For example, like a pin device a2 shown in FIGS. 4 and 5, a support shaft portion 202c is integrally formed at the base end of the pin 202a of the movable pin 202, and the support shaft portion 2c is attached to the mounting portion 201b of the pedestal 201. It may be detachably attached and supported by being inserted into and engaged with the insertion hole 12 formed in the center.

In the pin device a2, an engaging groove 21 is recessed on the outer periphery of the lower part of the support shaft portion 2c of the movable pin 202, and the pedestal 20
1 An engaging claw 13 that fits into the engaging groove 21 is protruded from a lower outer periphery of the fitting hole 12 of the mounting portion 201b, and the support shaft portion 202c is fitted into the fitting hole 12 of the mounting portion 201b. In the fitted state, the engaging claw 13 and the engaging groove 21 are fitted and engaged, and the movable pin 202 is attached and fixed to the pedestal 201.

The movable pin 202 does not come off the pedestal 201 by the load during traveling, but can be forcibly pulled out by grasping it with pliers or a special tool. Although the engaging claw 13 is provided in a ring shape along the peripheral surface of the lower part of the support shaft portion 2c, the engaging claw may be divided into a plurality of pieces along the outer periphery of the movable pin 202. Also, any existing engaging structure between the pedestal 201 and the movable pin 202 is applicable as long as it does not come off due to the impact during traveling and can be forcibly separated using a tool. May be used.

The tire with a pin device shown in FIGS. 6 (a) and 6 (b) has the same structure as that shown in FIGS. 1 to 3, but the pin device a3 of the tire is On the outer peripheral portion of the pedestal 301, an extending portion 14 that extends in a substantially cylindrical shape in the direction in which the movable pin 302 projects is integrally formed.

As described above, when the pedestal 301 is forcibly pushed and fitted into the mounting hole c of the tire tread surface b1, the surrounding rubber is pressed against the pedestal 301 and the movable pin. May not be performed smoothly. However, like the above-described pin device a3, by forming the extension portion 14 on the outer peripheral portion of the pedestal 301, the rubber acting on the movable pin 302, the mounting portion 301b of the pedestal 301, and the elastically deforming portion 303 from the surroundings. The pressure can be effectively reduced. Thereby, the frictional resistance generated when the movable pin 302 comes and goes is reduced, and the operation of the movable pin 302 can be performed smoothly. In addition, the above-described extending portion may be extended in a substantially cylindrical shape along the outer peripheral portion of the pedestal in the direction in which the movable pin projects, and the extending amount and shape may be arbitrarily changed. . Further, the extension may be divided into a plurality of pieces along the outer peripheral direction of the pedestal.

Next, the tire with a pin device shown in FIG. 7 will be described. Pin device a shown in FIGS. 7A and 7B
4 denotes a pedestal 401, a movable pin 402, and an elastic body 404.
It consists of: The pedestal 401 is formed in a substantially disc shape using a synthetic resin that is appropriately elastically deformed, for example, urethane resin. The pedestal 401 has a mounting portion 401b for screwing and mounting the movable pin 402 to the center of the surface.
Are formed integrally, and an outer edge portion 401a is formed integrally with the outer peripheral portion so as to project toward the rear surface side. The pedestal 401 is configured such that a plate-shaped portion around the mounting portion 401b is formed as an elastically deformable portion 403, and the portion 403 is flexibly deformed similarly to the above-described elastically deformable portion 3 of the pin device a (see FIG. 7-b), the movable pin 402 is supported so as to be able to come and go.

On the other hand, the movable pin 402
a and a male screw portion 402b, similar to the above-described embodiments, is softer than a pavement road surface such as a dry asphalt road surface or a concrete road surface and harder than a frozen road surface d 'covered by an ice layer. It is configured using a resin, for example, a urethane resin, a high heat resistant thermoplastic engineering plastic, a so-called PEEK material, or the like.

A hole 405 having a rectangular cross section is formed in the center of the tip end surface of the pin 402a, and a tool is inserted into the hole 405 and rotated. By inserting a tool such as a wrench into the hole 405 and rotating it, the work of attaching and detaching the movable pin 402 to and from the attachment portion 401b of the pedestal 401 can be easily performed. In addition, the above-mentioned hole may be changed corresponding to the tool to be used, and may be, for example, a hexagon or a cross.

The pin device a4 is mounted on the tire tread surface b.
When the fitting 401 is inserted into the mounting hole c, the pedestal 401 and the mounting hole c
The elastic body 404 is interposed between the bottom surface of the elastic member 404 and the bottom surface of the elastic member 404. The elastic body 404 elastically supports the pedestal 401 from the center side of the tire when the pin device a4 is fitted in the mounting hole c, and is an elastic body made of an elastic resin, such as silicone rubber, which is resistant to fatigue. Or it is constituted by rubber or the like.

The pin device a4 is configured such that the elastically deformable portion 403 of the pedestal 401 is elastically deformed so that the movable pin 402
Is supported so that it can come and go freely. However, when the elastic deformation portion 403 is fatigued due to long-term use and the restoring force is reduced, the repulsive force of the elastic body 404 functions to assist the restoration of the elastic deformation portion 403, and the movable pin 402 The structure is such that the return is reliably performed over a long period of time.

Next, a tire with a pin device shown in FIGS. 8A and 8B will be described. The pin device a5 provided in the tire with a pin device includes a pedestal 501, an elastic deformation portion 503 protrudingly formed at the center of the surface of the pedestal, and a movable pin 502 attached to and supported by the elastic deformation portion 503. is there.

The movable pin 502 is made of a synthetic resin that is softer than a pavement road such as a dry asphalt road or a concrete road, and harder than a frozen road d ′ covered by an ice layer, as in the above-described embodiments. And molded integrally. A mounting hole 25 formed by threading a female screw is provided on an end face on the base end side of the movable pin 502.

The pedestal 501 is integrally formed using a relatively soft and highly elastic synthetic resin. Pedestal 501
Is formed in a substantially disk shape, and the supporting portion 5
01b is integrally formed so as to project in a convex shape, and
A shaft-like elastically deforming portion 503 is integrally formed at a central portion of 01b. The elastically deformable portion 503 is provided on the support portion 5.
01b and a smaller diameter than the movable pin 502, and a male screw portion 15 is provided on the outer periphery of the distal end portion. The mounting hole 25 of the movable pin 502 is screwed into the male screw portion 15, and the movable pin 502 is Attach and support. That is, the elastic deformation portion 503 also functions as a mounting portion for the pedestal 501.

In the pin device a5 configured as described above, when the movable pin 502 collides against the road surface d during traveling, the elastic and small-diameter elastic deformation portion 503 is compressed in the axial direction by the collision force. And the movable pin 502 is attached to the mounting hole c as in the case of the pin devices a to a4 described above.
(FIG. 8B). When the impact force is released, the elastically deformed portion 503 that has been compressed and deformed is restored to the original shape, and the movable pin 502 is moved to the tire tread surface b1.
More protruding. In the pin device described above, the movable pin and the pedestal portion may be separately molded and integrally formed.
Further, the cross-sectional shape, the outer diameter, and the length of the elastically deformable portion 503 may be arbitrarily changed.

The pin device a6 shown in FIG. 9 to FIG.
Similar to the pin device a3 shown in FIGS. 6 (a) and 6 (b),
Elastic deformation part 603 and attachment part 601b of movable pin 602
The movable pin 602 is provided on the outer periphery of the base
An extension portion 614 that extends substantially in a cylindrical shape in the direction in which the pedestal 601 is formed is integrally formed, and an elastic body 604 similar to the pin device a4 is provided on the back side of the pedestal 601. A lid 605 is fitted in the opening on the back side.

The movable pin 602 is formed by integrally integrating a hard member 602a made of a hard synthetic resin and a soft member 602b made of a relatively soft synthetic resin. The hard member 602a is formed using a synthetic resin that is softer than a pavement road surface such as a concrete road surface and harder than a frozen road surface d ′ covered with an ice layer, similarly to the movable pins 2 to 502 of the above embodiment. It is. Also,
The soft member 602a is made of a synthetic resin that is softer than the hard member 602a and has good elastic deformation characteristics, and has high wear resistance and shock buffering properties.

The movable pin 602 is connected to the hard member 602a
After molding the hard member 602a, the hard member 602a is fixed at a predetermined position in a mold for molding the movable pin 602, and thereafter, a synthetic resin to be the soft member 602b is injected into the mold, to thereby obtain FIGS. Movable pin 602 as shown at 10
And molded integrally. This is a so-called two-color molding. The hard member 602a and the soft member 602b after molding are firmly joined and integrated via a joint surface formed in irregularities. The movable pin 602 formed in two colors as described above alternates between a hard member 602a, which is relatively hard and exhibits good penetration into the frozen surface, and a soft member 602b, which is relatively soft and has high wear resistance. In addition to exhibiting good grip characteristics on a frozen road surface, it is possible to exhibit characteristics with high wear resistance.

As described above, the hard member 602a is softer than a pavement road surface such as a concrete road surface and has a hardness range that is harder than a frozen road surface d 'covered by an ice layer. The same effect can be obtained by using a material other than the synthetic resin, for example, a soft resin or a synthetic resin mixed with carbon.

[0051]

As described above, the tire with the pin device according to the present invention has a movable pin made of a synthetic resin, a pedestal for mounting and supporting the movable pin, and an elastic deformation as a part of the pedestal, thereby enabling the movable Since it is equipped with a pin device constituted by an elastically deforming portion that supports the pin so that it can freely move in and out, even when the movable pin directly collides with the asphalt when traveling on a road surface where asphalt is exposed, the movable pin is Since it is made of a synthetic resin softer than the asphalt road surface, there is no need to worry about shaving the road surface like a metal spike pin, and the generation of dust can be fundamentally prevented.

Also, when traveling on a frozen road surface, when the tip of each movable pin collides with the frozen road surface, the tip of the movable pin that is harder than the frozen road surface cuts into the frozen road surface to increase the grip force. Demonstrate. At the moment when the movable pin touches the ground, the movable pin is slightly pushed into the mounting hole by the deformation of the elastic deformation part, but at the same time, the resilient force of the elastic deformation part causes the movable pin to bite into the frozen road surface. Get grip.

While traveling on an asphalt road surface, at the moment when the pin device comes into contact with the ground, a part of the elastically deformed portion of the pedestal is deformed via the movable pin, and the movable pin is pushed into the mounting hole to cause an impact force. Therefore, it is possible to effectively prevent the movable pin made of synthetic resin from being worn by the impact force at the time of ground contact. Therefore, even a movable pin made of a synthetic resin can be used for a long time.

Further, since the movable pin is supported so as to be able to protrude and retract by providing an elastically deformable portion as a part of the pedestal, a coil spring or an elastic body is interposed as a separate member on the base end side of the movable pin. Compared with the structure of (1), the structure for elastically supporting the movable pin so as to be able to protrude and retract is greatly simplified, and the function of protruding and retracting the movable pin can be provided at low cost.

According to a second aspect of the present invention, there is provided a tire with a pin device, a movable pin made of synthetic resin, a pedestal for mounting and supporting the movable pin, an elastically deformable portion integrally formed around the movable pin mounting portion of the pedestal, and a pin. The device is configured such that the pin device is fitted and mounted in a mounting hole formed in the tire tread surface, and the tip of the movable pin is projected from the tire tread surface. Therefore, when traveling on a road surface where asphalt is exposed, even if the movable pin directly collides with the asphalt, the movable pin is made of a synthetic resin softer than the asphalt road surface. There is no need to worry about shaving, and the generation of dust can be fundamentally prevented.

Further, when traveling on a frozen road surface, when the tip of each movable pin collides with the frozen road surface, the tip of the movable pin that is harder than the frozen road surface cuts into the frozen road surface to increase the grip force. Demonstrate. At the moment when the movable pin touches the ground, the movable pin is slightly pushed into the mounting hole by the deformation of the elastic deformation part, but at the same time, the resilient force of the elastic deformation part causes the movable pin to bite into the frozen road surface. Get grip.

Further, while traveling on an asphalt road, the elastically deforming portion formed around the mounting portion of the movable pin is flexibly deformed at the moment when the pin device comes into contact with the ground, so that the movable pin is placed inside the mounting hole. The movable pin made of synthetic resin can be effectively prevented from being worn by the impact force at the time of contact with the ground because it is pushed in and can absorb the impact force. Furthermore, since the movable pin is supported so as to be freely retractable by providing an elastically deformable portion integrally deformable around the movable pin mounting portion of the pedestal, a coil spring or an elastic body is provided on the base end side of the movable pin. Compared with the conventional structure provided separately, the structure for elastically supporting the movable pin so that it can reciprocate can be greatly simplified, and the movable pin can be provided with the function of extending and retracting at low cost. .

Further, when traveling on a frozen road surface, when the tip of each movable pin collides with the frozen road surface, the tip of the movable pin that is harder than the frozen road surface cuts into the frozen road surface to increase the grip force. Demonstrate. At the moment when the movable pin touches the ground, the movable pin is slightly pushed into the mounting hole by the deformation of the elastic deformation part, but at the same time, the resilient force of the elastic deformation part causes the movable pin to bite into the frozen road surface. Get grip.

In a tire having a pin device detachably mounted on and supported by a pedestal as in the tire with the pin device according to the third aspect, the movable pin can be moved while the pin device is mounted in the mounting hole in the tire tread surface. The pins can be replaced, and even if the movable pins become worn due to long-term use, they can be easily replaced with new ones.

In a tire having a pin device according to a fourth aspect of the present invention, an extension portion extending in a projecting direction of the movable pin is provided along an outer peripheral portion of the pedestal. The extension extending along the outer peripheral portion of the pedestal when fitted in the mounting hole of the surface can effectively reduce the contact pressure of the rubber pressed against the movable pin from the periphery. As a result, the frictional resistance generated when the movable pin comes and goes can be reduced, and the movable pin can be reliably brought into and out of operation.

The pin device of the present invention has the same effect as that of the tire with the pin device according to any one of claims 1 to 4 described above, by being fitted into a mounting hole recessed in the tread surface of the tire. Can demonstrate.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially cutaway front view showing a tire embodying the present invention, in which (a) is an enlarged longitudinal sectional view showing a protruding pin device, and (b) is a pin which is in contact with an asphalt road surface. FIG. 4 is an enlarged vertical sectional view showing the device, and FIG. 4C is an enlarged vertical sectional view showing the pin device in a state of being grounded on a frozen road surface.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is an exploded perspective view showing the pin device with a part cut away.

FIG. 4 is a longitudinal sectional view showing a pin device in which a movable pin is detachably attached and supported via an engagement structure.

FIG. 5 is an exploded perspective view showing the pin device partially cut away.

FIG. 6A is a longitudinal sectional view showing a pin device provided with an extension on a pedestal, and FIG. 6B is a longitudinal sectional view showing a state in which a movable pin of the pin device is immersed.

7A is a longitudinal sectional view showing a pin device in which an elastic body is interposed on the back surface of a pedestal, and FIG. 7B is a longitudinal sectional view showing a state where a movable pin of the pin device is immersed.

FIG. 8A is a longitudinal sectional view showing a pin device in which an elastically deformable portion is protruded from a pedestal, and FIG. 8B is a longitudinal sectional front view showing a state where a movable pin of the pin device is immersed.

FIG. 9 is a perspective view showing a pin device in which a movable pin is composed of a soft member and a hard member.

FIG. 10 is a vertical sectional front view of the movable pin.

11A is a sectional view taken along line XX in FIG. 9,
(B) It is X'-X 'line sectional drawing.

12A is a longitudinal sectional view showing the pin device, FIG.
(B) is a longitudinal sectional view showing a state where a movable pin of the pin device is immersed.

[Explanation of symbols]

 a, a2 to a5 ... pin device b ... tire b1 ... tread surface c ... mounting hole d ... asphalt road surface d1 ... frozen road surface 1, 201-601 ... pedestal 2, 202-602: movable pin 3, 203-603: elastic deformation portion 1b, 201b-601b: mounting portion 14, 614: extension portion

Continuation of front page (56) References JP-A-1-257607 (JP, A) JP-A-64-32904 (JP, A) JP-A-61-268506 (JP, A) JP-A-62-18307 (JP) JP-A-62-227805 (JP, A) JP-A-10-58924 (JP, A) JP-A-4-358908 (JP, A) JP-A-6-83402 (JP, U) JP-A-6-83402 (JP, U) 1-1107604 (JP, U) Japanese Utility Model Application 1-94102 (JP, U) Japanese Utility Model Application 1-83603 (JP, U) (58) Field surveyed (Int.Cl. ⁶ , DB name) B60C 11/16

Claims (5)

(57) [Claims] 1. A movable pin made of a synthetic resin material that is softer than an asphalt road surface and harder than a frozen road surface, a pedestal that integrally mounts and supports the movable pin,
By elastically deforming as a part of this pedestal, a pin device is constituted by an elastically deforming portion that supports the movable pin so that the movable pin can be protruded and retracted, and the pin device is provided in a mounting hole recessed at an appropriate interval on the tire tread surface. A tire with a pin device, wherein each of the pin devices is fitted and mounted from the pedestal side, and the movable pin tips of these pin devices are projected from the tire dread surface. 2. A movable pin made of a synthetic resin material softer than an asphalt road surface and harder than a frozen road surface, a pedestal for mounting and supporting the movable pin, and a movable pin mounting portion of the pedestal are integrally formed. A pin device is constituted by an elastically deformable portion which supports the movable pin so as to be able to protrude and retract by elastic and flexible deformation, and the pin device is inserted into a mounting hole recessed at an appropriate interval on a tire tread surface from a pedestal side. A tire with a pin device, which is fitted and mounted, and the tip of a movable pin of the pin device is projected from the tire dread surface. 3. The tire with a pin device according to claim 1, wherein the movable pin is detachably attached to and supported on a pedestal. 4. The tire with a pin device according to claim 1, further comprising an extension portion extending along an outer peripheral portion of the pedestal in a projecting direction of the movable pin. 5. A pin device used for the tire with a pin device according to claim 1.