JPS61291207A - Antiskid device for tire - Google Patents

Abstract

PURPOSE:To prevent a plurality of strands from sliding one another in a steel cord embedded in a lateral member to be mounted on an outer circumference of a tire, and thereby suppress fatigue due to wear, by arranging the strands in spaced relationship with each other and filling the gap defined between each strand with a filler. CONSTITUTION:The device is formed by a plurality of lateral members 22 to be mounted on an outer circumference of a tire 20. Each lateral member 22 is formed by embedding a steel wire 26 in a rubber 24 as a filler. The steel wire 26 has a plurality of spikes 28 embedded at a longitudinally central portion. The steel wire 26 is formed by twisting a plurality of strands 36. After the strands 36 are twisted to tightly contact with each other, they are slightly untwisted to define a gap, so as to prevent the strands 36 from contacting with each other. Thus, even when a torsional force is applied to the steel wire 26, the strands 36 are prevented from sliding one another, thereby suppressing fatigue due to wear.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vehicle tire anti-slip device that is attached to the outer periphery of a tire to prevent the tire from slipping when the vehicle is moving.

[Background Art and Issues to be Solved] A metal chain attached to the outer circumference of a tire is generally used as a vehicle tire anti-slip device used during snowfall. However, metal chains are complicated to install, generate a lot of noise while the vehicle is running, and have the disadvantage that the chain hits the vehicle body while the vehicle is running, causing damage to the vehicle body.

To eliminate this drawback, a rubber anti-slip device called a ladder type is also used (1983-
No. 8483, Jitko No. 56-20245, Jitko No. 57-
30173, Japanese Patent Publication No. 57-53202), in this rubber anti-slip device, a plurality of cross members are arranged on the outer periphery of the tire in parallel with the tire axis, and the ends of these members are connected with ropes to prevent the outer periphery of the tire. It is designed to be attached to the

In this rubber anti-slip device, the equipment is separated from each other, so it is easy to attach to the tire, makes less noise, and eliminates damage to the vehicle body.

A tire slip prevention device to which this rubber anti-slip device is applied will be described with reference to FIG. 4. The cross member 10 has a substantially U-shape with both longitudinal ends bent to form leg portions 10A. The bent part of this leg ff1lOA has a small radius of curvature with the center part of the cross member lO, or is bent into a square shape to form the leg part 10A.
The tire is fitted so that it matches the shape of the tire's outer circumference. In order to properly place the steel cord 12 buried in this cross member 10 at this bent part, a protrusion that protrudes into the mold and supports the steel cord 12 is required before molding. recess 14 corresponding to
will be formed into the crosspiece lO.

When the tire runs after the cross member 10 is attached to the outer periphery of the tire using the tips of the legs 10A, a large torsional force is generated at the base of the legs 10A due to traction (driving force) during this running. This torsional force becomes concentrated stress due to the presence of the recess 14, and the steel cord 12
This causes the wires to slide against each other, leading to fatigue failure.

The present invention has been made in consideration of the above-mentioned facts, and an object of the present invention is to obtain a tire slip prevention device that does not cause large stress to be concentrated on the buried steel cord even when subjected to torsional force.

[Summary and operation of the invention J The tire slip prevention device according to the present invention includes a plurality of cross members attached to the outer circumference of the tire at predetermined intervals, and these cross members have a plurality of wires twisted together between fillers. This tire slip prevention device has a steel cord embedded therein for reinforcement, and is characterized in that the strands of the steel cord are spaced apart from each other and the filler is interposed therebetween.

Therefore, even when a large torsional force is applied to the cross member, the strands are separated from each other and no sliding wear occurs.
As a result, fatigue waves and breakage are less likely to occur, and it can be used for a long period of time.

[Embodiment of the Invention] Fig. 1.2 shows a tire slip prevention device used in a first embodiment of the present invention. This tire anti-slip device consists of a plurality of cross members 22 attached to the outer circumference of a tire 20.

This cross member 22 has a structure in which a steel wire 26 is embedded in rubber 24 as a filler.

A plurality of (three in this embodiment) spikes 28 are embedded in the longitudinal center of the steel wire 26 . These spikes 28 are dish-shaped and their open ends protrude from the surface 23 of the crosspiece 22, and this protrusion is covered with a thin part integral with the rubber 24. The spikes 28 are in a state where they can be exposed to the surface of the cross member 22 due to wear of this thin portion. In addition, there are spikes 2 in the center of this horizontal member 22.
A protrusion 30 inclined with respect to the longitudinal direction of the cross member 22 is formed between the cross members 22 to improve ground contact.

Leg portions 22B are connected to both ends of the cross member 22 via shoulder portions 22A. As shown in FIG. 2, the width of the cross member 22 gradually decreases from the shoulder portion 22A to the center portion, and is equal in the portion where the three spikes 28 are present, and is equal to the width of the leg portion 22B.
It is narrower than the width dimension of . Therefore, the cross member 22 has a stepped shape at the end portion in the width direction, so that the impact force caused by the traction force can be alleviated.

The state shown in FIG. 1 is the molded state of this embodiment, and the leg portions 22B are in a more open state than when actually attached to the tire 20. That is, the shoulder portion 2.2A has a large curvature R of 20 to 150 mm, and a plurality of small grooves 32 are formed on the inner side of the shoulder portion 22A. Thereby, even when setting the cross member 22 on the outer periphery of the tire 20, the leg portion 22B is configured to easily fit into the outer periphery of the tire 20.

Moreover, a pair of recesses 34 are formed so as to sandwich the small grooves 32 on the plurality of sides. These recesses 34 correspond to projections protruding from the mold for tensioning the steel wire 26 inside the mold during molding.

FIG. 3 shows the cross-sectional shape of the steel wire 26 used in this embodiment. This steel wire 26 has a structure in which a plurality of wires 36 are twisted together, and these wires 36 are twisted together until they come into close contact with each other, and then untwisted by a slight amount. . That is, these strands 36 are spaced apart from each other and placed in the mold with a slight gap between them, and then the rubber 24 is filled. Therefore, the rubber 24 is filled between these wires 36, and the wires 36 are not in close contact with each other. Therefore, even if a twisting force is applied to the steel wire 26, the strands 36 do not slide against each other, so that fatigue due to wear does not occur. .

A hook 3B is hooked onto the tip of the leg portion 22B, and by tightening the hook 38 with a rope 40, the cross member 22 is attached to the outer periphery of the rubber 24.

In the tire slip prevention device of this embodiment configured as described above, since the plurality of cross members 22 have independent shapes, they can be manufactured individually and the mold is small enough to fit a car.

1st R when using! 4, the rope 40 may be attached and tightened by the end hook 38 of the cross member 22.

Although the curvature R of the shoulder portion 22A is large, a plurality of small grooves 32 are formed on the inside of the second curvature portion, so that the shoulder portion 22A can easily adapt to the outer periphery of the tire 20 and be in close contact with it.

During running and braking, the cross members 22 act as anti-slip agents in the traveling direction, and each spike 28 penetrates into the snow and water surfaces to improve braking force. In particular, in this embodiment, since both ends of the center portion of the cross member 22 are made narrow, the contact position of the road surface contact portion is not uniform, and the impact can be alleviated.

In addition, the load due to the driving force is most concentrated on the shoulder portion 22A, but the radius of curvature during forming is large as shown in FIG. Since the structure is such that the steel wires 26 are not close to each other but are separated from each other, and the rubber 24 is inserted between them, fatigue failure due to the sliding of the strands 36 against each other will not occur even if the steel wires 26 are subjected to torsional force. This is less likely to occur, and the life of the cross member 22 can be extended.

[Effects of the Invention] As explained above, the tire slip prevention device according to the present invention includes a plurality of cross members attached to the outer circumference of the tire at predetermined intervals, and these cross members have a plurality of wires between the fillers. A tire slip prevention device in which twisted steel cords are buried for reinforcement purposes, and the wires of the steel cords are spaced apart from each other and the filler is interposed, so that the tire slip prevention device is reliably installed. It has an excellent effect of being able to maintain strong driving force and braking force for a long period of time.

[Brief explanation of the drawing]

Fig. 1 is a sectional view (corresponding to the cross section taken along the line II in Fig. 2) showing an embodiment of the tire slip prevention device according to the present invention, Fig. 2 is a plan view of the cross member in Fig. 1, and Fig. 3 4 is a sectional view taken at right angles to the axis of the steel wire, and FIG. 4 is a sectional view showing a conventional example. 20--Tire, 22-Horizontal material, 24-E-rubber, 26-Fist steel cord, 36-Element wire. Agent Patent Attorney Atsushi Nakajima Figure 2 Figure 3

Claims (1)

[Claims] (1) A tire slipper that is equipped with a plurality of cross members attached to the outer circumference of the tire at predetermined intervals, and in these cross members, steel cords made of multiple strands of wire are embedded between the filling materials for reinforcement. 1. A tire slip prevention device, characterized in that the strands of the steel cord are spaced apart from each other and the filler is interposed therebetween.