JPH1053009A - Spike pin for tire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain excellent durability and display sufficient anti-skid function by fitting a tip, made of hard rubber or ceramic, into the center part of a shank made of fiber reinforced polycarbonate resin containing Aramid fiber or polyarylate fiber at a specified ratio. SOLUTION: A shank 2 is made of Armid fiber or polyarylate reinforced fiber polycarbonate resin. The content of Aramid fiber or polyarylate fiber is 10-14%. A tip 5 is made of hard rubber of ceramic. A spike pin 1 for a tire consisting of the shank 2 and the tip 5 is formed by pressing an intruding part 7 into a through hole 3 of the shank 2 from the base end side, making a flange part 6 of the tip 5 butt a flange part 4 of the shank 2, and protruding a tip part of the tip 5 slightly from the through hole 3. Wear resistance is thereby excellent, and a non-skid effect can be maintained over a long period of time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spike pin for a tire, and more particularly to a spike pin for a tire which has no problems such as road damage and noise and has excellent durability.

[0002]

Conventionally, a spike pin used for automobile tires for snowy roads has a carbon steel shank having a conical hole in the center, and a frustoconical portion in the shank hole. And a chip made of a cemented carbide or a hardened steel into which is press-fitted. However, when traveling on a road without snow with the tires equipped with the spike pins, the road is severely damaged, causing dust pollution, and generating a large amount of noise.

To solve such problems, Japanese Unexamined Patent Publication No. 59-171705 discloses a frustum-shaped portion of a cemented carbide or hardened steel chip having a frusto-conical portion, and a hole in the center. There is disclosed a snow spike press-fit into a hole of a shank made of glass fiber reinforced polycarbonate resin having a glass fiber content of 20 to 40%. Also,
Japanese Patent Application Laid-Open No. 62-139703 discloses that a frustoconical portion of a cemented carbide or hardened steel chip having a frustoconical portion has a carbon fiber content of 10 to 30 having a hole in the center.
A snow spike press-fit into a hole of a shank made of a carbon fiber reinforced polycarbonate resin is disclosed.
However, in a snow spike formed by press-fitting a cemented carbide or hardened steel tip into such a glass fiber or carbon fiber reinforced polycarbonate resin shank, the wear resistance and strength of the shank are not sufficient.
There has been a problem that the shank is liable to be worn or cracked, so that the chip is likely to come off or fall down. In addition, there is a problem that roads and noise are also caused by cemented carbide or hardened steel chips.

[0004] The problem of dust and noise caused by such metal spike pins has come to be widely taken up in society, and the manufacture, sale and use of spike pins using metal shanks and chips are substantially required. Began to be banned.

For this reason, recently, various spike pins made of resin have been proposed. Japanese Patent Application Laid-Open No. Hei 5-238213 discloses a rubber spike pin which is provided on a side surface of a spike pin formed of hard rubber and which is attached to a tire such that a gap is provided outside the protective film. ing. Japanese Patent Application Laid-Open No. 7-1920 discloses a spike pin made of a mixture of a hard fine member such as sand, ceramic particles, or fiber-reinforced resin particles, a rubber member such as natural rubber or synthetic rubber, and a silicon-based resin. Have been. Furthermore, Japanese Utility Model Application Laid-Open No. 63-82605 discloses a spike pin made of a synthetic resin reinforced with whiskers such as silicon carbide whiskers.

Although the use of such a synthetic resin spike pin has prevented the damage to the road, the synthetic resin spike pin is inferior in abrasion resistance and is severely worn. Since the mechanical strength is not sufficient, cracks and the like are liable to occur and there is a problem that the durability is not sufficient. Further, there is a problem that the slip prevention function is not always sufficient.

[0007] The present invention has been made based on the above problems, and provides a spike pin for a tire which is free from problems such as road damage and noise, has excellent durability, and exhibits a sufficient anti-slip function. With the goal.

[0008]

According to the first aspect of the present invention, there is provided a tire spike pin comprising a hard rubber or ceramic chip having an aramid fiber or polyarylate fiber content of 10%.
It is inserted into the center of a shank made of 強化 40% fiber reinforced polycarbonate resin. By adopting such a means, the tire spike pin is mounted so as to be flush with the outer peripheral surface of the tire, and when the vehicle is driven by an automobile, the rubber tire's ground contact portion is dented by elastic force so that the tire spike pin is recessed. The spike pins protrude accordingly. And
Since the chip is made of hard rubber or ceramic, a better anti-slip effect can be exhibited than a chip made of resin. Moreover, the hard rubber or ceramic chip is superior in abrasion resistance as compared with the synthetic resin, so that the anti-slip effect can be maintained for a long period of time. In addition, since the tip is made of hard rubber or ceramic and the shank is made of fiber reinforced polycarbonate resin, road damage, noise, and the like hardly occur even on a road without snow. Further, the shank is made of a fiber reinforced polycarbonate resin with an aramid fiber or a polyarylate fiber.The aramid fiber or the polyarylate fiber has high strength and excellent wear resistance. The resulting shank has excellent wear resistance, and furthermore has a high mechanical strength, so that cracks and the like are unlikely to occur.As a result, the chip is prevented from falling out or falling due to abrasion or breakage of the shank. It has improved durability as a spike pin for a tire.

According to a second aspect of the present invention, in the tire spike pin, the tip has a truncated conical portion having a taper angle of 1 to 3 degrees toward the outer peripheral surface of the tire when the tire is inserted. By adopting such means, when a load is applied to the hard rubber or ceramic chip, the load is transmitted in the axial direction of the chip and is absorbed to some extent by the tire, so that the aramid fiber or Since a load is hardly applied to a shank made of fiber reinforced polycarbonate resin made of polyarylate fiber, the durability is further improved.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of a spike pin for a tire according to the present invention will be described in detail with reference to FIGS. The spike pin 1 for a tire has a through hole 3 in the center.
Shank 2 having a flange portion 4 formed at the base end portion
And a tip 5 penetrating into the shank 2,
The through-hole 3 has a shape of a truncated cone with a taper angle (β) of 1 to 3 ° tapered from the base end to the tip. The tip 5 has a flange portion 6 and a penetrating portion 7, and the penetrating portion 7 is, like the through-hole 3, tapered from the base end to the tip, and has a frustoconical shape with a taper angle (α) of 1 to 3 °. Part. The through-hole 3 is shorter in the length direction than the penetrating portion 7 of the chip 5, and the diameter of the base end of both is formed such that the penetrating portion 7 is slightly larger.

The shank 2 as described above is made of aramid fiber or polyarylate fiber reinforced polycarbonate resin. The aramid fiber or polyarylate fiber reinforced polycarbonate resin used in the present invention is a polyester of carbonic acid and dihydric phenol or glycol,
Typically, an aramid fiber or a polyarylate fiber is mixed with a polycarbonate resin obtained by a reaction between bisphenol A and phosgene.

The aramid fiber has a toughness and flexibility about five times that of steel at the same weight and is excellent in abrasion resistance and the like. Specifically, Kevlar (registered trademark Dupont) is used. (Made by the company). The polyarylate fiber is basically a polyester of terephthalic acid and / or isophthalic acid and a dihydric phenol, typically a polyarylate resin obtained by reacting terephthalic acid and / or isophthalic acid with bisphenol A. The fibers are tough, have high impact resistance, and are excellent in heat resistance and chemical resistance. Specifically, Vectran (trade name) can be used. When the content of the aramid fiber or the polyarylate fiber as described above is less than 10%, sufficient improvement effect such as abrasion resistance cannot be obtained by the blending thereof, but when the content exceeds 40%, the abrasion resistance and the like become higher. Not only the improvement effect is not obtained but also the moldability is reduced, so that the content is 10 to 40%.

The chip 5 is made of hard rubber or ceramic. The hard rubber is not particularly limited as long as it is harder than the rubber of the tire, and a material obtained by appropriately blending a general rubber additive with ebonite, chloroprene rubber, butyl rubber, or the like can be used. The ceramic is not particularly limited, and zirconia is preferable because it is desirable to have excellent wear resistance and high hardness, but it is preferable to use hard rubber in consideration of damage to the road surface and vibration absorption.

The tire spike pin 1 shown in FIG. 2 comprising the shank 2 and the tip 5 described above press-fits the penetration portion 7 of the tip 5 into the through hole 3 of the shank 2 from the base end side. The tip portion 5A of the chip 5 is slightly projected from the through-hole 3 by abutting the flange portion 6 of the chip 5 against the flange portion 4 of FIG. In addition, the tip 5 is inserted into the cavity of the mold having the shape of the shank 2.
Can be manufactured in advance, and a spike pin 1 for a tire can be manufactured by injecting a fiber-reinforced polycarbonate resin into the outer cavity.

Next, the operation of the above configuration will be described. As shown in FIG. 3, the tire spike pin 1 of the above embodiment is driven into the hole 10A so that the tip 5A of the chip 5 is flush with the outer peripheral surface of the automobile tire 10. The spike pin 1 for a tire is driven into the tire 10 by applying a lubricant to the outer surface of the shank 2 and forming a hole in the tire 10.
Alternatively, the shank 2 may be screwed into the tire 10 while being rotated, or the shank 2 may be gripped by the pinch mechanism up to just before the flange portion 4, and the pinch mechanism may be pressed into the hole 10A formed in the tire 10 and then removed. Good.

When the tire 10 into which the spike pin 1 for a tire is driven is mounted on an automobile and travels,
When the location of the spike pin 1 contacts the ground due to the rotation of the tire 10, the tire 10 is made of rubber. Therefore, the contact point of the tire 10 is dented by elastic force, and as shown in FIG. The tip 5A protrudes from the outer peripheral surface of the tire 10. The tip 5A of the tip 5 bites into snow or the like, thereby exhibiting a slip prevention function. In particular, when the chip 5 is made of hard rubber, an excellent anti-slip function can be exhibited due to the large friction coefficient of the rubber. Further, since the hard rubber is more excellent in abrasion resistance than the fiber reinforced polycarbonate resin which is the material of the shank 2, the anti-slip function can be exhibited for a long time. On the other hand, when the chip 5 is made of ceramic, the ceramic chip 5 having high strength and high hardness cuts into a snowy road, thereby exhibiting an excellent anti-slip function. Further, since the ceramic is more excellent in abrasion resistance than the fiber-reinforced polycarbonate resin which is a material of the shank 2, the anti-slip function can be exhibited for a long time.

When the vehicle travels on a road without snow, the spike pins 1 are directly pressed against the road surface 11. At this time, the edge 2A of the shank 2 first hits the road surface 11, but since the shank 2 is made of polycarbonate resin, the road surface is hardly damaged. Moreover, this polycarbonate resin is reinforced with aramid fiber or polyarylate fiber, and this aramid fiber or polyarylate fiber has high strength, superior toughness and wear resistance as compared with glass fiber or carbon fiber. Therefore, the abrasion of the shank 2 is small, and cracks are hardly generated. After that, the chip 5 hits the road surface. Since the chip 5 is made of hard rubber or ceramic, the road surface is hardly damaged as compared with the chip made of cemented carbide or hardened steel. Particularly, by making the chip 5 made of hard rubber, it is possible to almost eliminate the damage on the road surface. Further, by forming the chip 5 from hard rubber,
This also has the effect of absorbing shock and vibration when the road surface 11 and the spike pin 1 are pressed against each other.

In this embodiment, the penetrating portion 7 of the chip 5 has a taper angle (α) of 1 to 3 ° tapered from the base end toward the tip end, that is, toward the outer peripheral surface of the tire 10.
When a load P1 is applied to the tip of the tip 5 as shown in FIG. 4 and the tip 5 tries to enter deeply, the pressure P2 at this time is changed to the tire 10 as shown in FIG.
And is hardly transmitted to the outer shank 2. Therefore, no extra load is applied to the shank 2 and cracks and the like are less likely to occur. Moreover, by setting such a taper angle (α),
There is also an effect that even if the tip 5 is broken in the shank 2, it is hard to come off. On the other hand, as shown in FIG. 5, if the penetrating portion 7 of the tip 5 is tapered so as to expand from the base end to the tip, a load P1 is applied to the tip of the tip 5 and the tip 5 may penetrate deeply. In this case, the pressure P2 at this time is also applied to the direction in which the through hole 3 of the shank 2 is enlarged, so that cracks and the like are easily generated in the shank 2.

As described above, the spike pin 1 for a tire according to the present embodiment comprises a hard rubber or ceramic chip 5 having an aramid fiber or polyarylate fiber content of 10 to 40.
% Of the shank 2 made of fiber-reinforced polycarbonate resin, so that a better anti-slip effect can be exerted than a chip made of synthetic resin. Moreover, the hard rubber or ceramic chip 5 is superior in abrasion resistance as compared with the synthetic resin.
The anti-slip effect can be maintained for a long time. Further, since the tip is made of hard rubber or ceramic and the shank 2 is made of fiber-reinforced polycarbonate resin, road damage, noise, and the like hardly occur even on a road without snow. Furthermore, since the shank 2 is made of a fiber reinforced polycarbonate resin with an aramid fiber or a polyarylate fiber, it has excellent wear resistance,
In addition, cracks and the like are less likely to occur due to high mechanical strength, and as a result, chips are prevented from falling or falling due to abrasion or breakage of the shank, so that the durability of the tire spike pin 1 is improved. It has become. In particular, since the chip 5 has a truncated conical portion with a taper angle (α) of 1 to 3 ° tapering toward the outer peripheral surface of the tire 10 when the tire is inserted, the chip 5 made of hard rubber or ceramic is used. Even if a load is applied, the load is transmitted in the axial direction of the tip 5 and absorbed by the tire 10, so that the load is less likely to be applied to the shank 2, so that the durability is further improved. .

The tire 10 equipped with the tire spike pin 1 of the present embodiment does not damage the road surface even without snow, has low noise, and has excellent durability. No discomfort when driving. In particular, it is preferable that the tip 5 is made of hard rubber because the effect of absorbing vibration and impact is exhibited. The spike pin 1 for a tire as described above is suitable not only for a normal passenger car but also for a freight transportation vehicle and the like. The diameter of the shank 2 and the like may be appropriately changed according to the vehicle to which the spike pin 1 is applied.

Although the present invention has been described with reference to the accompanying drawings, the present invention is not limited to the first embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, as shown in FIG.
And the penetration part 7 may be formed straight. Further, as shown in FIG.
Instead, the tapered hole 3A may be formed so as to spread from the base end to the tip, and the tip 5 may be formed as a tapered bar which spreads from the base end to the tip.

[0022]

The present invention will be described in more detail with reference to the following specific examples.

Examples 1 and 2 and Comparative Examples 1 and 2 Aramid fiber (Kevlar (registered trademark)) content 30%
The shank 2 as shown in FIG. 1 was manufactured by injection molding using the polycarbonate resin of the above. In addition, the taper angle (β) of the through hole 3 was about 2 °. Also, a hard rubber chip 5 as shown in FIG. 1 in which the taper angle (α) of the penetration portion 7 was 2 ° was manufactured. The tip 5 was press-fitted from the base end side of the shank 2 thus obtained to produce a spike pin for a tire (Example 1). Spike pins for tires were produced in the same manner when polyarylate fibers (Vectran (trade name)) were used instead of aramid fibers (Example 2) and when glass fibers were used (Comparative Example 1).

Further, a spike pin for a tire (Comparative Example 2) was produced by using a glass fiber reinforced polycarbonate resin instead of a hard rubber as a chip.

The spike pin obtained in this way is
Drive 2000 tires per tire and 2000 without snow
When a running test was performed on a kilometer, the spike pins for tires of Examples 1 and 2 showed little wear of the shank 2 and the tip 5, and no breakage or detachment of all spike pins was observed. In the spike pin of Comparative Example 1 in which the shank 2 was formed of a glass fiber reinforced polycarbonate resin, it was observed that the shank 2 was severely worn, and the chip 5 at the center was pulled out or fell. Further, the spike pin of Comparative Example 2 in which the tip 5 was also formed of a glass fiber reinforced polycarbonate resin was inferior in durability due to severe wear of the shank 2 and the tip 5.

The tires equipped with the spike pins of Examples 1 and 2 and Comparative Example 1 have less vibration and noise than the tires equipped with the spike pins of Comparative Example 2, and have a riding comfort close to that of a normal tire. Met. This is probably because the chip 5 was made of hard rubber.

Examples 3 and 4 Spike pins were prepared in the same manner as in Examples 1 and 2, except that a tip made of zirconia ceramic was used instead of a tip made of hard rubber.
4). The spike pins obtained in this manner were hit with 88 pieces per tire, and a running test of 2,000 km was performed in a snow-free state. As a result, wear of both the shank 2 and the tip 5 was small, and all the spike pins No damage or missing was observed.

[0028]

According to the first aspect of the present invention, there is provided a spike pin for a tire, comprising a hard rubber or ceramic chip having a center portion of a shank made of a fiber reinforced polycarbonate resin having an aramid fiber or a polyarylate fiber content of 10 to 40%. Therefore, a hard rubber or ceramic tip can exhibit a good anti-slip effect. Moreover, the hard rubber or ceramic tip is excellent in abrasion resistance, so that the anti-slip effect can be maintained for a long period of time. Further, since no metal is used, road damage, noise, and the like hardly occur. Furthermore, since the shank is made of a fiber-reinforced polycarbonate resin with an aramid fiber or a polyarylate fiber, it has excellent abrasion resistance and furthermore has high mechanical strength,
Cracks are less likely to occur, and chips are prevented from falling off or falling down due to shank wear.
It has improved durability as a spike pin for a tire.

In the tire spike pin of the second aspect, the tip has a truncated conical portion with a taper angle of 1 to 3 ° toward the outer peripheral surface of the tire when the tire is inserted. When a load is applied to a hard rubber or ceramic chip, the load is transmitted in the axial direction of the chip and is absorbed by the tire to some extent, so that the fiber reinforced polycarbonate resin made of aramid fiber or polyarylate fiber is used. Since a load is not easily applied to the shank, the durability is further improved.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a spike pin for a tire according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing a spike pin for a tire according to the embodiment.

FIG. 3 is a cross-sectional view showing a state where the spike pin for a tire of the embodiment is mounted.

FIG. 4 is a sectional view showing a use state of the spike pin for a tire of the embodiment.

FIG. 5 is a cross-sectional view showing a use state of a spike pin for a tire, which is a comparative example with the above-described embodiment.

FIG. 6 is a sectional view illustrating a spike pin for a tire according to a second embodiment of the present invention.

FIG. 7 is a sectional view showing a tire spike pin according to a third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Spike pin for tires 2 Shank 3 Through hole 4 Flange part 5 Tip 6 Flange part 7 Penetration part

Claims (2)

[Claims] 1. A hard rubber or ceramic chip is aramid fiber or polyarylate fiber content of 10 to 40%.
A spike pin for a tire, wherein the spike pin is fitted into the center of a shank made of fiber reinforced polycarbonate resin. 2. The spike pin for a tire according to claim 1, wherein the tip has a frusto-conical portion having a taper angle of 1 to 3 ° tapered toward an outer peripheral surface of the tire when the tire is inserted.