JPH0829645B2 - Tire anti-skid device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a tire slip prevention device which is mounted on the outer periphery of a tire and prevents the tire from slipping when the vehicle is traveling.

BACKGROUND ART AND MEASURES TO BE SOLVED As a vehicle tire anti-skid device used during snowfall or the like, a metal chain mounted on the outer circumference of a tire is generally used. However, the metal chain has drawbacks that it is complicated to mount, makes a lot of noise during traveling, and the chain hits the vehicle body during traveling and damages the vehicle body.

For this reason, a non-slip device made of rubber, urethane elastomer, or the like has been proposed (Japanese Utility Model Publication No. 54-8483). Further, there is a tire slip prevention device in which rubber is stretched in a net shape in order to reduce vibration during traveling.

Since these anti-slip devices made of rubber or the like have a small coefficient of friction, it is necessary to drive spikes made of metal on ice (ice burn). However, the spikes cause the road surface to be damaged when driving on a road surface without snow and ice, which causes damage to the road surface. Therefore, if the friction coefficient of rubber or the like can be increased, spikes can be eliminated or reduced, and in addition to economic merit, road surface damage can be prevented.

In view of the above facts, it is an object of the present invention to provide a tire antiskid device capable of increasing friction with a road surface and reducing the number of driving spikes.

[Summary and Action of the Invention] The present invention is a tire anti-slip device mounted on the outer circumference of a tire to prevent tire slip, wherein the tire anti-slip device partially covers a tread surface of a tire and at least a ground contact surface. It is characterized in that the side is formed of a foamed molded body.

Therefore, in the present invention, it is possible to increase the apparent friction coefficient between the foamed molded product and the tread, increase braking and climbing force, and reduce the number of spikes used.

By using a rubber having a foaming ratio of 1 to 100%, preferably 5 to 30%, the foamed molded article can be appropriately deformed by following fine irregularities on the snow and snow surface. The foamed molded product can be applied not only to the tread contact portion but also to other portions.

[Embodiment of the Invention] FIGS. 1 and 2 show a tire slip prevention device 10 according to a first embodiment of the present invention. This tire anti-skid device 10
As shown in FIG. 3, the outer frame forming reinforcing cords 12 and 14 and the small frame forming reinforcing cords 16 and 18 are filled with rubber to form a main body 20 in which these cords are enclosed. ing. A metal cord made of synthetic resin such as nylon or tetron can be applied to this reinforcing cord.

The main body 20 is formed with a tortoise shell shape continuously in the direction of arrow A,
It is designed to be wound around the tire not shown. Further, a rubber protrusion 22 is extended at the tip of the tortoise shell in a direction perpendicular to the direction of arrow A of the main body 20, and a mounting hole is attached to the protrusion 22.
24 are drilled.

As shown in FIG. 4, a foamed rubber layer is provided on the ground surface side of the main body 20.
It is 21. The foamed rubber layer 21 has a foaming ratio of 1 to 10
0%, that is, the volume of rubber put in the molding die is set to 99 to 50% of the inner volume (cavity volume) of the molding die, and then foamed to improve the adhesion to the snow and snow surface. This rubber foam is vulcanized in the mold (heating about 150 ° C)
For the unvulcanized rubber molded inside, a nitroso type foaming agent, an azo type foaming agent, a hydrazide type foaming agent, etc. are used as an organic foaming agent. These are dispersed in rubber to form fine voids and increase the friction coefficient of the foamed rubber layer 21.

Explaining the arrangement shape of the reinforcing cords in this embodiment, the outer frame forming reinforcing cords 12, 14 pass only within the outer frame portion 20A of the main body 20, and the outer frame forming reinforcing cords 12,
14 are arranged in a sine curve in the same cycle. In this sine curve-shaped maximum amplitude portion, it goes around the mounting hole 24 and proceeds. Mounting hole when molding the tire anti-skid device 10
Since a pin is projected from a mold (not shown) to 24, if the intermediate portion of the outer frame forming reinforcing cords 12, 14 is wound around this pin in a loop, it can be easily sealed in rubber. . Further, in the sine curve-shaped minimum amplitude portion, the outer frame forming auxiliary cords 12 and 14 are arranged to intersect with each other.

In the outer frame portion 20A, a pair of first parts that form a small hexagonal shape similar to the outer frame portion 20A and partially overlap with the outer frame portion 20A
Small frame forming reinforcing cords 16 and 18 are arranged in the small frame portion 20B. These small frame forming reinforcement cords 16 and 18 are also sine curve shaped main body 20 like the outer frame forming reinforcement cords 12 and 14.
Although it is disposed inside, the amplitude thereof is smaller than that of the outer frame forming reinforcing cords 12 and 14, and the cycle thereof is about half that of the outer frame forming reinforcing cords 12 and 14.

Therefore, the small frame forming reinforcing cords 16 and 18 move while intersecting with each other at the intersections of the outer frame forming reinforcing cords 12 and 14 and their intermediate points.

Therefore, the first small frame portion 20B forms a pair of tortoiseshell portions inside the outer frame portion 20A, and the remaining portion of the first small frame portion 20B is formed as a rhombic second small frame portion 20C in the main body 20. I have. The second small frame part 20C is formed such that a part thereof overlaps the first small frame part 20B and another part overlaps the outer frame part 20A.

A large diameter portion 26 is formed in a part of the main body 20, and a spike 28 is embedded in the large diameter portion 26.

As shown in FIG. 5, the tire anti-slip device is in use.
Mount the 10 on the outer circumference of the tire 40. In this installation, one hook part of the hook 42 is hooked to the mounting hole 24, respectively.
Hook the middle part of the endless rope 44 to the other hook part of. The hook 42 may be previously locked so as not to come off the mounting hole 24. A hook 46 is hooked on the rubber protrusion 22A at the end of the rubber protrusion 22 in the longitudinal direction of the main body 20 (direction of arrow A in FIG. 1).

This hook 46 has a pair of hooks 46 as shown in FIG.
A is adapted to be hooked in the mounting holes 24A of both ends 22A of the main body 20, and the base portion is a lube portion 46B, and a plurality of ropes 44 are caulked and gripped by adhesion or the like. For this reason, this hook 46 collects a plurality of ropes 44 and collects these ropes 44 at the time of storage, and eliminates the possibility of being lost when these ropes are scattered.

In addition, since the tension of these ropes is weak with a single rope, it can be easily hooked on each hook 42, but if a plurality of ropes are hooked on the hook 42, a large tension is applied to the hook 42, regardless of centrifugal force etc. , The body 20 is securely held to the outer periphery of the tire 40.

The rope 44 preferably has a structure in which a synthetic fiber such as urethane, thermoplastic rubber (TPR), tetron, or nylon is used as a core material, and an elastic ring is formed by coating the outer periphery of the rope with an elastic elastomer such as rubber. As a result, when the braid is used as in the related art, it becomes hard due to the freezing of the absorbed moisture,
It is possible to eliminate the bite failure when caulking metal fittings such as. In addition, the use of the braid causes rubbing and fluffing, and muddy water is easily absorbed, but this can be solved.

The number of ropes 44 is not limited to the two shown in the figure, and may be three or more. The back side of the tire 40 shown in FIG. 5 is attached using ropes and hooks that do not expand and contract.

Reference symbol T shown in FIG. 1 indicates a corresponding position of the tire shoulder portion when the main body 20 is mounted on a tire.

The mounting force acting on the mounting hole 24 is the outer frame portion 20A, the first small frame portion 20.
Since B has a hexagonal shape, appropriate tension is applied, and the tire anti-slip device 10 surely adheres to the tire outer periphery.

During traveling, the road surface of the main body 20 and the protrusions of the spikes 28 serve as a ground contact surface to prevent tire slippage. In particular, the ladder portion 20D arranged at right angles to the traveling direction is effective in improving the climbing force and the braking force. Since the main body 20 is a combination of large and small turtle shells, the step difference on the outer circumference of the tire is small and vibration during traveling is small.

Since the ground contact portion of the main body 20 is formed of the foamed rubber layer 21 as described above, it is possible to properly fit fine irregularities on ice and snow to increase the friction coefficient and improve the stability. The anti-skid device of this embodiment has twice the frictional force and about half the stopping distance as compared with the case where solid rubber on the ground surface is used on wet ice. Therefore, the number of spikes 28 can be reduced. Further, when running on a dry road surface, since the foamed rubber layer 21 contains fine bubbles, the wear resistance is almost the same as that of the solid rubber, and the durability is sufficient.

The present invention is not limited to the above-described anti-skid device and can be applied to various shapes, and the reinforcing cord arrangement pattern can be modified in various ways. Further, the foamed rubber layer may be provided on the entire area of the main body of the anti-skid device, or may be a foamed molded body other than the foamed rubber.

EFFECTS OF THE INVENTION As described above, the tire anti-skid device of the present invention is characterized in that the tread surface of the tire is partially covered and at least the ground contact surface side is formed of the foamed molded product, so friction with the road surface Has the excellent effect that the number of spikes can be reduced.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of the tire anti-slip device according to the present invention, FIG. 2 is a perspective view of FIG. 1, FIG. 3 is a plan view showing a wire arrangement state in the first embodiment, FIG. Fig. 4 is the first
Fig. IV-IV line sectional view, Fig. 5 is a perspective view showing a state of being mounted on a tire, and Fig. 6 is a perspective view of a hook. 10 …… Tire slip prevention device, 20 …… Main body, 21 …… Foam rubber.

Claims (1)

[Claims] 1. A tire anti-slip device mounted on the outer circumference of a tire to prevent tire slip, wherein the tire anti-slip device partially covers a tread surface of the tire and at least a ground contact surface side is formed of a foamed body. A tire antiskid device characterized by being formed.