JPS6397408A - Nonmetallic tire chain and its manufacture - Google Patents

Abstract

PURPOSE:To improve durability of a chain for preventing slip of cars by forming a tread portion of a reinforcing layer with a flat plate or the like made of plastic and providing a side portion with a cord bonded integrally with the plastic plate of the tread portion. CONSTITUTION:A reinforcing layer 10 arranged in both a tread portion T and a side portion S is formed integrally with a plastic plate 11 of the tread portion T by forming the tread portion T with the plastic plate 11 of a planar shape with a cord 12 having a hook terminal 13 at its both ends and arranged continuously between both side portion S and the tread T. With this constitution, a manufacture becomes simple and moreover durability can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in a non-metallic tire chain used as a skid device when an automobile tire runs on a snowy or icy road surface, and a method for manufacturing the same.

[Conventional technology]

Conventionally, net type chains and ladder type chains have been used as this type of anti-slip device.
As disclosed in Japanese Patent Publication No. 3337, Japanese Patent Publication No. 58-49366, etc., fJ4-shaped core material made of cord is coated with rubber and synthetic resin, and Japanese Patent Publication No. 54307-1987
As disclosed in Japanese Patent Application Publication No. 2003-110016, there is known a structure in which only synthetic resin is molded into a mesh shape.

[Problem that the invention seeks to solve]

Among conventional net-type non-metallic tire chains, those that use cord as a mesh core material have a covering material such as rubber stored in the grooves for forming 8M meshes in the press mold during molding, and the cord is placed on top of this. Sprinkle it around to form a mesh, then fill it with a covering material and press-form it (Japanese Patent Publication No. 13337/1983), or use a core material coated with a covering material in advance to form a mesh in a press mold. A mesh is formed by stretching it into the groove, and this is press-formed (Tokuko Kokō 5)
8-49366).

However, with the former manufacturing method, it takes a lot of time and effort to manually fill the press mold with the covering material and cord and stretch it, making the manufacturing process complicated and reducing work efficiency. In the latter manufacturing method, the mesh forming process in the press mold is more efficient than in the former method, but it requires a separate process to cover the cord with the material to be coated in advance. Therefore, there is a problem that the overall working efficiency is inevitably lowered, and in either case, the product becomes expensive.

In addition, the net type non-metal tire chain mentioned above is
When installing spikes that are necessary to prevent slipping when driving on icy roads, the mesh core material is diagonally crossed and the base is fixed at the bulging intersection and buried in the covering material.
There is a problem in that the fixing strength to the tire chain is low and the spikes cannot be held sufficiently.

On the other hand, tire chains made of synthetic resin molded into a mesh shape do not have manufacturing difficulties or lack of ability to hold spike pins, but are prone to wear because they do not have a covering material. In addition to the problem of poor durability, synthetic resins have high bending rigidity and poor flexibility, so there is a performance problem in that they do not always follow the deflection of the tire 70% of the time.

The purpose of the present invention is to solve the above problems and provide a non-metallic tire chain that can be manufactured in a simple process and has excellent durability and ability to follow tire deflection, and a method for manufacturing the same. shall be.

[Failure to solve the problem]

A non-metallic tire chain according to the present invention is a non-metallic tire chain in which a vulcanized rubber coating layer is provided on the surface of a reinforcing layer having a ground-contacting part and side parts extending on both left and right sides of the ground-contacting part. The grounding portion of the layer is formed as a flat plate or a curved plate made of synthetic resin, and at least a side portion of the reinforcing layer is provided with a cord that is integrally bound to the grounding portion.

Further, in the method of manufacturing a non-metallic tire chain according to the present invention, the ground contact portion in which the cords embedded in the reinforcing layer are formed on at least the side portions on both sides in the width direction is molded into a flat or curved shape by injection molding of a synthetic resin material. Form into a plate shape,
Either the reinforcing layer is covered with a covering material made of unvulcanized rubber material on at least the top and bottom surfaces thereof and then charged into a mold, or the reinforcing layer and the covering material made of unvulcanized rubber material on the top and bottom surfaces are separately molded. The first invention provides a method of adhering a vulcanized rubber coating layer to the surface of the reinforcing layer by heating under pressure after the reinforcing layer is charged into the reinforcing layer. The grounding part in which the cord is embedded is formed into a flat or curved plate shape by injection molding of synthetic resin material, this reinforcing layer is put into a mold, and a coating of unvulcanized rubber material is applied to the surface of the reinforcing layer. The second invention is a method of bonding a vulcanized rubber coating layer to the surface of the reinforcing layer by coating the reinforcing layer by transfer molding and then heating under pressure.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings.

Figure 3 shows an example of a non-metallic tire chain according to the present invention. The non-metallic tire chain shown in the figure is a type of ladder type, and 6 to 10 pieces are connected to each tire for 1 Mi.
used as.

In the figure, two long and large parts parallel to the left and right direction constitute a rock ladder 1, and one short and short part in the middle constitutes a floating ladder 2. The rock ladder 1 and the floating ladder 2 are composed of four arms 3 are connected by.

In the above-mentioned non-metallic tire chain, the central part along the center line perpendicular to the rock ladder 1 is the grounding part T attached to the tread part of the tire, and the part extending on both sides of the grounding part T in the width direction is the part of the tire. It has a side part S that is attached to the side wall part.

A reinforcing layer 10 is provided at each of the grounding part T and side part S of this non-metal tanya chain as shown by broken lines.
The entire surface of the reinforcing layer 10 is covered with a coating layer 20 except for the hook holes 14 at both ends of the side portions (see FIGS. 2 to 4).

The reinforcing layer 10 is molded as a synthetic resin plate 1) with a planar grounding part, and a cord 12 having hook terminals 13 at both ends is continuously arranged between the right side part and the left side part. It is integrally molded with the synthetic resin plate 1) of the grounding part. As the synthetic resin material for the grounding part, it is preferable to use a material having excellent toughness, bending strength, and low-temperature properties, such as polyamide or polyester. Although these synthetic resin materials may be molded alone, they can also be molded with appropriate reinforcing materials mixed therein. The cord 12 is preferably made of steel or other synthetic fibers with high tensile strength such as polyester, nylon, aromatic polyamide, etc., knitted into a wire shape.

For the coating layer 20, it is preferable to use natural rubber or synthetic rubber with excellent abrasion resistance and cold resistance, such as styrene-butadiene rubber (SBR) or natural rubber (NR).
) and styrene-butadiene rubber (SBR) or natural rubber (NR) and styrene-butadiene rubber (SBR).
A mixture of BR) and butyl rubber (TIR) is suitable.

The cross-sectional shapes of the synthetic resin plate 1) of the reinforcing layer 10 and the covering layer 20 can be selected arbitrarily, respectively.
The thickness of the synthetic resin plate 1) of the reinforcing layer 10 varies depending on the strength of the synthetic resin used and the type and size of the tire to be installed.
The thickness of the non-metallic tire chain coated with the coating layer 20 is preferably set to about 6 to 8 mm, depending on the type and size of the tire to be installed.
It is preferable to select an appropriate number within the range of 5 dragons.

Spikes 15 are embedded in the ground contact portion T of the non-metallic tire chain. As shown in FIGS. 2 and 3, this spike 15 is firmly held by the lower part of the shank 16 and the flange 17 being embedded integrally inside the synthetic resin plate 1) of the reinforcing layer 10. The chip 18 is made to protrude from the surface of the covering layer 20 with its upper part covered by the covering layer 20.

When attaching the non-metallic tire chains of the above configuration to tires, the longitudinal center line of one set of non-metal tire chains is aligned with the circumferential center line of the tread portion of the tire, and the ground contact part T is bent. The hook is placed over the tread of the tire, and the side part S is bent and pressed against the sidewall part of the tire.One end of the hook is fixed to the hook hole 14 of the side part S, and the other end of the hook is tied with a connector. and hook it onto a rope stretched in a circular ring around the sidewall of the tire (not shown when the tire is installed).

Next, a method for manufacturing the non-metallic tire chain having the above structure will be explained step by step.

First, the reinforcing layer has a groove for molding a synthetic resin plate, a groove for inserting a cord, a protrusion for forming a hook hole, and a protrusion for forming a hook hole, which have a planar shape shown in FIG. 1 and a predetermined depth, and the shapes shown in FIGS. 3 and 4. The reinforcing layer 10 is molded using an injection mold (not shown) provided with holes for inserting spikes having a hole in a predetermined position.

Code 1 is inserted into the groove for inserting the cord for molding the reinforcing layer of this mold.
2 and inserting the hook terminal 13 into the hook hole molding protrusion, and further inserting the spike 15 into the spike insertion hole, then inject the molten synthetic resin material into the groove for molding the synthetic resin plate and harden it. let As a result, as shown in FIG. 5, a reinforcing layer 10 is formed as a composite body in which the cord 12 is molded integrally with the synthetic resin plate 1) and the spikes 15 are embedded in the synthetic resin plate 1).

Next, the surface of the reinforcing layer 10 is coated with a W material made of a rubber material. In this coating step, a compression molding mold or a transfer molding mold (neither is shown) is used.

These molds are provided with a concave groove for forming a covering layer, a protrusion for forming a hook hole, and a hole for inserting a spike, each having a planar shape shown in FIG. 1 and having a predetermined depth.

When using a compression molding mold, the already formed reinforcing layer 1
00 Surface The surface skin or its upper and lower surfaces are covered with an unvulcanized rubber coating material and inserted into the mold, or the unvulcanized rubber coating material on the lower surface side, the reinforcing layer, and the unvulcanized rubber coating on the upper surface side. The materials are charged into a mold in this order, and at least the upper and lower surfaces of the auxiliary/pre-layer 10 are covered with a covering material, and the mold is pressurized and heated at a predetermined pressure and temperature, and then taken out from the mold to be reinforced. A non-metallic tire chain is obtained in which the coating layer 20 of vulcanized rubber is adhered to the surface of the layer 10.

When using a transfer molding mold, after inserting the existing reinforcing layer 10 into a predetermined position in the mold, unvulcanized rubber + additive is injected into the groove for molding the covering layer to form the reinforcing layer. A coating material of unvulcanized rubber is applied to the surface of 10 by IW. Next, using this mold or another mold for vulcanization, the product is heated under pressure in the same manner as described above, and then the product is taken out from the mold.

In the above embodiment, the case where the reinforcing layer cord was continuous from one side part to the other side part through the grounding part was explained, but the thickness of the synthetic resin plate of the grounding part was increased In the case of molding, the cord may be disposed discontinuously only on the left and right side portions, and one end of the cord may be tied to the synthetic resin plate.

Furthermore, the cord of the reinforcing layer may not only be arranged on the rock ladder as in the illustrated embodiment, but also arranged in a loop between the floating ladder and the arm as necessary. By doing so, the strength of the synthetic resin plate of the grounding portion can be increased.

Furthermore, the synthetic resin plate of the reinforcing layer is not limited to the case where it is formed into a flat plate shape as in the above embodiment, but it can also be formed into a curved shape having a curvature approximately equal to the curvature in the circumferential direction and the width direction of the tread portion of the tire to which it is mounted. It can also be formed into a plate shape. By forming the non-metallic tire chain into a curved plate shape in this manner, the non-metallic tire chain can be securely attached to the tire, and the operation when attaching it to the tire is simplified and the time required for attachment can be shortened.

Further, although spikes are embedded in the non-metallic tire chain of the above embodiment for use on icy roads, the spikes may be omitted when used for use on snowy roads.

Note that the present invention is not limited to the ladder type tire chain of the above embodiment, but can be similarly applied to regular ladder type and net type nonmetallic tire chains.

[Effects of the Invention] As explained above, in the non-metallic tire chain of the present invention, the ground contact portion of the reinforcing layer corrugated by the vulcanized rubber coating layer is formed from synthetic resin into a flat or curved plate shape. Since the reinforcing layer is configured with a cord that is integrally tied to the grounding part at least on the side part, the grounding part has 1f wear resistance compared to conventional ones made only of synthetic resin.
In addition to improved durability, the cords placed on the side parts have high tensile strength and have lower bending rigidity and flexibility than the ground contact part, so they can better follow the deflection of the tire when running. As a result, a non-metallic tire chain with good balance and high performance can be obtained.

Further, according to the method for manufacturing a non-metallic tire chain of the present invention, a composite of a synthetic resin plate and a cord as a reinforcing layer is formed by injection molding, and then a covering material of a rubber material is vulcanized and bonded to the reinforcing layer. Because of this, especially when manufacturing net-type non-metallic tire chains, the forming process for the reinforcing layer is extremely simple compared to conventional ones that use fine cord as the core material, and the reinforcing layer has excellent formability. It becomes possible to form

In addition, the synthetic resin plate of the reinforcing layer of this invention has high bending rigidity, so it has excellent shape retention after molding, and can be easily inserted into a compression mold.
Since it can be easily held in a predetermined position even within a transfer molding mold, it is possible to manufacture a highly accurate product at a low cost even when manufacturing a net type product.

Furthermore, when it is necessary to embed spikes in the non-metallic tire chain of the present invention, they can be inserted and fixed at a predetermined position in the synthetic resin plate during molding of the reinforcing layer, resulting in highly retainable spike performance. It can also be used as a non-metallic tire chain.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the non-metallic tire chain of the present invention, and FIG. 2 is a large section taken along the line A-A in FIG.
The figure is a large cross-sectional view of the B-B line area in Figure 1, and Figure 4 is the C line in Figure 1.
5 is a plan view of the reinforcing layer. In the figure, 10 is a reinforcing layer, 1) is a synthetic resin plate, 12 is a cord, 20 is a covering layer, T is a grounding part, and S is a side part.

Claims (3)

[Claims] (1) In a non-metallic tire chain in which a vulcanized rubber coating layer is provided on the surface of a reinforcing layer having a ground contact part and side parts extending on both sides of the ground contact part in the width direction, the ground contact part of the reinforcing layer is synthesized. 1. A non-metallic tire chain formed as a flat or curved plate made of resin, characterized in that a cord is disposed on at least a side portion of the reinforcing layer and is integrally bound to a synthetic resin plate of a grounding portion. (2) The grounding portions in which the cords are embedded, which are disposed on at least the side portions on both widthwise sides of the reinforcing layer, are formed into a flat or curved plate shape by injection molding of a synthetic resin material, and at least the upper and lower surfaces of this reinforcing layer are formed by injection molding of a synthetic resin material. Either the reinforcing layer and the covering material of unvulcanized rubber material on the upper and lower surfaces are charged into the mold separately and then vulcanized. A method for manufacturing a non-metallic tire chain, which comprises adhering a vulcanized rubber coating layer to the surface of a reinforcing layer by heating under compression. (3) Form the grounding part in which the cords embedded in the side parts of the reinforcing layer at least in the width direction are embedded into the shape of a flat plate or curved plate by injection molding of a synthetic resin material, and then mold this reinforcing layer into a mold. The method is characterized in that the reinforcing layer is charged and the surface of the reinforcing layer is coated with a covering material of unvulcanized rubber material by transfer molding, and then heated under pressure to adhere the vulcanized rubber covering layer to the surface of the reinforcing layer. Method for manufacturing non-metallic tire chains.