JPS6188040A - Toothed belt - Google Patents

Abstract

PURPOSE:To improve the durability by constituting a cloth which is to be adhered on the surface of a toothed part as that the cloth is made by laminating fabric having the superior insulating and wear-resistant characteristics and fabric having the superior adhesive characteristics. CONSTITUTION:A toothed belt 1 has tooth parts 3 formed at specific pitches at the internal side of the belt part 2 thereof and cloth 4 is fit on the surface of the tooth parts 3. The cloth 4 consists of both insulating fiber 6 at one side thereof and other fiber 7 having more superior adhesive characteristics with respect to the material of the body of the belt than the insulating fiber 6 has. The fiber 7 has the double weft yarn constitution. Fiber yarn of aromatic polyamid or the like which has poor adhesiveness to the body of the belt but remarkably superior insulating and wear-resistant characteristics can be used as the contact face with a pulley.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a toothed belt, and more particularly to a toothed belt that is resistant to shear cracks in toothed portions and has excellent durability.

[Technical background of the invention and its problems] Belts, round belts, toothed belts, etc. are widely used as belts for power transmission.
Since it is difficult for t' to occur between the belt and the pulley, it has been increasingly used in recent years.

South Korea 1 belt suffers from the above-mentioned advantages and is often subjected to harsh conditions such as high speeds, high temperatures, and high loads.
1. tD is a serious problem in that the grindstone tends to deteriorate and shear cracks are likely to occur in the toothed part, resulting in damage to the toothed part.

In order to solve such problems, for example,
Publication No. 6277 discloses that a knitted fabric made of heat-resistant aromatic hX polyamide fiber yarn is arranged on the surface of the toothed part of a rubber toothed belt in which a tensile member is embedded, with the one with the greater elongation extending in the longitudinal direction of the belt. A toothed belt has been proposed which is characterized by having a coating attached thereto.

However, in such toothed belts, the knitted fabric made of heat-resistant aromatic polyamide 145<41 yarns is directly attached to the belt body;
Due to the poor adhesion between the belt body and the belt body, if the belt is used for a long period of time, the belt body and the knitted fabric will peel off, so even if expensive aromatic polyamide fibers are used, they are not sufficiently effective! ? There was a serious problem that it could not be done.

[Purpose of the invention]

The present invention is an attempt to solve the problems associated with such conventional techniques, and aims to provide a toothed belt that is less likely to cause shear cracks in the tooth profile and has excellent durability. This object is achieved by dramatically improving the adhesion between the heat-resistant aromatic polyamide fibers attached to the toothed portions of the toothed belt and the belt body.

[Summary of the invention]

The toothed belt according to the present invention has a toothed belt formed with a toothed profile of a constant pitch and a tensile material embedded therein, and one surface of which is made of heat-resistant fiber yarn and the other surface of which is made of heat-resistant fiber yarn. A fabric having a knitted structure or a woven structure made of Il miscellaneous yarn, which has better adhesion to the belt body than heat-resistant fiber yarns, has a toothed surface and a surface made of TlIlt yarn, which has excellent adhesion to the belt body. It is characterized by being placed so that the two are in contact with each other.

As the heat-resistant fibers, aromatic polyamide fibers are particularly preferred, and as the T11 fibers having excellent adhesive properties, heat-resistant polyamide and polyester m fibers are particularly preferred.

[Detailed description of the invention]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A toothed belt according to the present invention will be described below with reference to embodiments shown in the drawings.

FIG. 1 is a cross-sectional view of a toothed belt according to the present invention, and this toothed belt l-1 is constructed by providing a toothed portion 3 with a constant pitch on the inside of a belt base 2. Part 3
A fabric 4 is provided on the surface having the . In some cases, the toothed belt 1 may have a tensile member 5 in the belt base 2. Although the toothed belt 1 described above has toothed portions only on the inner surface, the toothed belt 1 according to the present invention has toothed portions on both sides, which have toothed portions on the outer surface in addition to the inner surface. It may also be a belt.

The material for forming the toothed belt 1 is a synthetic resin or rubber that has high tensile strength and wear resistance. natural rubber,
Styrene-butadiene rubber, nitrile rubber, butyl rubber, etc. are used. Among these, polyurethane resins are particularly preferred.

As the tensile material 5, conventionally known materials are widely used, and fabrics, robes, etc. made of fibers with high tensile strength and low elongation, such as glass fibers, carbon fibers, and aromatic polyamide fibers, are used.

The fabric 4 provided on the surface of the belt 1 having the toothed portion 3 is made of heat-resistant fiber yarn 6 on one side and made of heat-resistant fiber yarn 6 on the other side, as shown in a schematic diagram of FIG. It is composed of fiber yarns 7 that have better adhesion to the material forming the belt body than the heat-resistant T&lI fibers, and has a double weft structure. Then, the fabric 4 is placed on the surface of the toothed belt 1 having the toothed part 3 so that the surface of the toothed belt 1 and the surface of the fabric 4 made of fiber yarn with excellent adhesiveness are in contact with each other. It is being

As the heat-resistant fiber yarn, for example, aromatic polyamide fiber commercially available from DuPont under the name Kevlar is particularly preferred, but other fibers such as heat-resistant polyamide fiber may be used as long as they have excellent heat resistance. I can do it.

Polyamide fibers, polyester fibers, acrylic fibers, and the like are used as fibers with excellent adhesive properties.

Specifically, combinations of aromatic polyamide fibers and polyester I miscellaneous, heat-resistant polyamide fibers and polyester mills, etc.
Combinations of aromatic polyamide fibers and acrylic fibers are preferred.

Further, the structure of the set 11 of the fabric 4 is a knitted structure or a woven structure. As the knitting structure, a simple drawn knitted fabric, a double jersey knitted fabric, etc. can be used.

As for the weaving structure, a layered structure is used in which different systems are used for the warp and weft yarns on the front and back sides, and either a single layered structure or a double layer structure is used, but a completely single layered fabric is used in which the warp and weft yarns on both the front and back sides are made from different systems. It is preferable to have a double structure made by simultaneously folding 2 layers of 2 layers together on top and bottom.

In some cases, the fabric 4 may also have a non-woven structure.

In this way, when the front and back surfaces of the fabric 4 provided on the surface having the toothed part 3 of the toothed belt 1 are made of different materials, and the structure of the fabric 4 is a knitted structure or a woven structure, the threads of each other are physically separated. Because they are tied together, it is possible to select threads by taking into consideration the adhesion between the belt body and the fabric as well as the heat and abrasion resistance of the fabric, without considering the adhesion between the threads. Therefore, it is possible to use fiber threads such as aromatic polyamide, which has excellent heat resistance and abrasion resistance, for the contact surface with the pulley, although it has poor contact properties with the belt body. As the other thread, a thread having better adhesion to the belt body than aromatic polyamide is used, and the surface constituted by this thread is brought into contact with the belt body.

〔Effect of the invention〕

In the present invention, since the fabric on both sides of the belt body is made of different yarns, it is provided on the toothed surface of the belt body, so it has excellent heat resistance and abrasion resistance. An excellent effect can be obtained in that it is possible to use a fabric in which a fiber yarn having poor adhesiveness is used as the contact surface with the belt pulley without considering the adhesiveness between the fiber yarn and the belt body.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the toothed belt according to the present invention, and the second
The figure is a schematic diagram showing the structure of the fabric used for the toothed belt according to the present invention. DESCRIPTION OF SYMBOLS 1... Toothed belt, 2... Belt base, 3... Toothed part, 4... Fabric. Applicant's Representative Inomata Figure 1

Claims (1)

[Claims] 1. On the toothed surface of a toothed belt in which a toothed belt with a constant pitch is formed and a tensile material is embedded, one side is made of heat-resistant fiber yarn and the other side is made of heat-resistant fiber yarn. A fabric having a knitted structure or a woven structure made of fiber threads that have better adhesion to the belt body than heat-resistant fiber threads makes contact between the tooth-shaped surface and the surface made of fiber threads that have excellent adhesive properties. A toothed belt characterized by being provided as follows. 2. Claim 1, characterized in that the heat-resistant fiber yarn is an aromatic polyamide fiber, and the fiber yarn that has better adhesion to the belt body than the heat-resistant fiber yarn is a polyester fiber. Toothed belt described in. 3. The toothed belt according to claim 1 or 2, wherein the fabric has a double layered structure.