JPH11294542A - Toothed belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a meshing sound by forming a tooth fabric with the texture of a woven fabric or a knit fabric applied with no adhesive process by an adhesive and coated with no rubber in a toothed belt having a tooth rubber forming teeth and the tooth fabric covering the face on the side where the teeth are provided. SOLUTION: This toothed belt 1 is provided with a tensile body 2 extending in the longitudinal direction of the belt 1, a tooth rubber 3 forming teeth at a constant pitch in the longitudinal direction of the belt 1, a back rubber 4 provided on the back face side of the tensile body 2 and a tooth fabric 5 covering the face on the side where the teeth of the belt 1 are provided. The tooth fabric 5 is made of the texture of a plain woven fabric, a twill woven fabric, a satin woven fabric or a knit fabric. The tooth fabric 5 is made of the texture of the woven fabric or the knit fabric applied with no adhesive process by an adhesive and coated with no rubber, and tooth crests 6, bottom faces 7 and tooth side faces 8 are formed with the texture. The meshing with a pulley is made smooth, the belt noise is reduced, and a rotation transfer error is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a toothed belt.

[0002]

2. Description of the Related Art In general, since a load from a toothed pulley is applied to a tooth rubber of a toothed belt, the tooth rubber is made of an elastic elastomer material, and the surface thereof is covered with an elastic tooth cloth. . Further, this tooth cloth is generally so-called rubberized, which is immersed in a resorcinol-formalin-rubber latex (RFL) liquid and subjected to an adhesive treatment, and then covered with rubber by a soaking treatment or a spreading treatment. It is.

However, in a toothed belt using a tooth cloth rubberized after the above-described bonding treatment, the rubber coated by the rubberization of the tooth cloth covers the surface of the tooth rubber and is exposed to the outside. As a result, the friction coefficient between the toothed pulley and the toothed pulley increases when the belt is driven, generating noise due to friction when the toothed belt and the toothed pulley mesh with each other, or abrasion of the rubber covering of the tooth cloth caused by the friction. There is a problem that the powder is scattered, and it is unsuitable for use in a place where the noise and the scattering of the rubber powder are disliked. For example, OA such as a printer
(Office automation) It is difficult to use for toothed belts for equipment and other general industries.

On the other hand, JP-A-7-190150 and JP-A-8-35540 disclose that a tooth cloth covering tooth rubber is only bonded with an RFL solution, and that the tooth cloth is not rubberized thereafter. The use of cloth is described.

More specifically, the solid content of resorcin-formaldehyde resin on tooth cloth is set to 30 to 50% by weight.
Alternatively, by adjusting the amount to 20 to 50% by weight, the opening surrounded by the thread of the tooth cloth is made small and difficult to expand, thereby preventing the tooth rubber from being exposed on the surface of the tooth cloth. This is to prevent scattering of rubber wear powder when the belt is used. Further, since there is no rubber coating rubber on the tooth cloth, the solid content of the RFL liquid on the surface of the tooth cloth comes into contact with the toothed pulley, thereby reducing the friction coefficient between the tooth cloth and the toothed pulley. It is intended to reduce noise to prevent the generation of noise and to eliminate the problem of scattering of the coated rubber wear powder.

[0006]

However, an RFL is required for the tooth cloth.
Even if only the processing is performed, the tooth tip surface, the tooth bottom surface, and the tooth side surface are hardened by this, so that the meshing noise with the pulley during belt running becomes large, and the meshing during belt running is not necessarily performed. Since the rotation is not performed smoothly, the rotation transmission error between the driving pulley and the driven pulley also increases, that is, there is a problem that the rotation of the two pulleys is likely to be out of synchronization.

[0007]

The present invention adopts the idea of using soft tooth cloth instead of the conventional idea of using RFL-treated or rubberized tooth cloth, and solves the above problem. Is to solve.

That is, the invention of this application is directed to a tension member extending in the belt length direction, a tooth rubber provided on the inner surface side of the tension member and forming teeth at a constant pitch in the belt length direction, In a toothed belt including a back rubber provided on the back side of the upholstery and a tooth cloth covering a surface on which the teeth of the belt are provided, the tooth cloth is subjected to an adhesive treatment with an adhesive liquid. It is formed of a woven or knitted fabric that is not rubberized and is not rubberized, and the fabric constitutes a tooth tip surface, a tooth bottom surface, and a tooth side surface.

As described above, since the tooth tip surface and the tooth side surface are not covered with rubber or other elastomer and are made of fabric such as woven fabric, the coefficient of friction is small, and the meshing with the pulley becomes smooth. In addition, the meshing noise is reduced, and the rotation transmission error between the pulleys is also reduced. In addition, the fact that the bottom of the tooth is made of a fabric such as a woven fabric means that a cushion effect is obtained by the compressibility of the tooth cloth itself when the tooth tip of the pulley hits that part, The beating sound between the attached belt and the pulley is reduced. Further, distortion of the root portion of the belt at the time of the engagement is reduced by the cushion effect.

Another aspect of the present invention relates to a toothed belt in which a fabric such as a woven fabric forms a tooth tip surface, a tooth bottom surface, and a tooth side surface as described above. Is the eye of the cloth (a gap surrounded by the yarns that make up the cloth.
same as below. ) Partially, and the tooth rubber hardly penetrates into the eyes of the tooth cloth at the bottom of the tooth. As a result, while ensuring the adhesive force between the tooth rubber and the tooth cloth, the friction coefficient on the tooth side surface is reduced to make the engagement with the pulley smooth, and the beating function is given to the tooth bottom to reduce the above-mentioned tapping noise. In addition, it is possible to prevent distortion of the tooth root.

According to still another aspect of the present invention, there is provided a toothed belt in which a fabric such as a woven fabric forms a tooth tip surface, a tooth bottom surface, and a tooth side surface, as described above, wherein the tooth rubber invades the eyes of the tooth cloth. It is characterized in that the degree of graduation gradually decreases from the tooth tip to the tooth bottom. That is, while ensuring the adhesive force between the tooth rubber and the tooth cloth, the friction coefficient on the tooth side surface is reduced to make the meshing with the pulley smooth, and the beating sound is given to the tooth bottom by giving a cushion function. , And prevention of distortion at the root of the tooth.

[0012]

As described above, according to the present invention, in a toothed belt in which a tooth cloth is provided on the side of the belt where teeth are provided, a cloth such as a woven cloth is used as the tooth cloth. ,
Since the dough forms the tooth apex surface, the tooth bottom surface and the tooth side surface, the meshing with the pulley becomes smooth, which is advantageous for reducing belt noise and rotation transmission error, and
The cushion effect is obtained on the tooth bottom, which is advantageous for reducing the tapping sound at the time of the meshing, for reducing the distortion of the belt root, and for prolonging the life of the belt. In particular, the tooth rubber partially penetrates into the eyes of the tooth cloth at the tooth tips and the tooth side surfaces, and the tooth rubber belt where the tooth rubber hardly penetrates into the eyes of the tooth cloth at the tooth bottom, or the tooth rubber. If the degree of penetration of the tooth cloth into the eyes of the tooth cloth is gradually reduced from the tooth tip to the tooth bottom, the above effect can be obtained while securing the adhesive force between the tooth rubber and the tooth cloth. Obtainable.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show a toothed belt 1 according to an embodiment of the present invention. The toothed belt 1 has a tension member 2 extending in the belt length direction and a constant pitch (for example, 1.0 to 3...) Provided on the inner surface side of the tension member 2 in the belt length direction.
A tooth rubber 3 forming teeth at a pitch of 2 mm), a back rubber 4 provided on the back side of the tensile member 2, and a tooth cloth 5 covering a surface of the belt provided with teeth. ing.

The tensile member 2 is provided in a spiral shape. For the tensile member 2, for example, a low elongation and high strength cord made of a material selected from polyester fiber, aliphatic polyamide fiber, aromatic polyamide fiber, rayon fiber, glass fiber, steel wire and the like is used. Tooth rubber 3
The back rubber 4 is made of, for example, natural rubber (NR), styrene butadiene rubber (SBR), chloroprene rubber (C
R), a single material such as nitrile rubber (NBR) or butyl rubber (IIR), or a rubber or polyurethane rubber (U) obtained by appropriately blending these materials.

The tooth cloth 5 is composed of a plain woven fabric such as a canvas, a twill woven fabric, a satin woven fabric or a knitted fabric. Elastic woven fabric woven with warp yarns, or woven fabric woven with warp yarns such as nylon and aramid fibers, with weft yarns made by covering aromatic polyamide fibers and the like with urethane elastic material and having elasticity And the like, but are not limited thereto.

A feature of the present invention is that the tooth cloth 5 is formed of a woven or knitted fabric in which the fabric such as the woven fabric has not been subjected to an adhesive treatment with an adhesive solution such as an RFL solution or rubberized. As shown in FIG. 3, the fabric forms the tooth tip surface 6, the tooth bottom surface 7, and the tooth side surface 8. And
The tooth rubber 3 partially penetrates into the eyes of the tooth cloth 5 at the tooth tips and the tooth side surfaces, and the tooth rubber 3 hardly penetrates into the eyes of the tooth cloth at the tooth bottom. Is characterized in that the degree of penetration into the eyes of the tooth cloth 5 gradually decreases as going from the tooth tip to the tooth bottom.

Such a toothed belt 1 can be manufactured as follows.

The fabric such as the woven fabric is finished in a cylindrical shape and fitted into a mold for forming a toothed belt. In this mold, tooth grooves for forming belt teeth on the surface are formed at a constant pitch over the entire circumference. Next, a cord for a tensile member is spirally wound over the tooth cloth of the mold, and a sheet of unvulcanized rubber is further wound thereon, followed by pressurization and heating from outside.

As a result, a part of the unvulcanized rubber is extruded from the gap between the adjacent cords to the tooth space side of the mold, whereby the woven fabric for the tooth cloth is extended and together with a part of the rubber. Pressed into each tooth space, the unvulcanized rubber is vulcanized. The belt material thus obtained is removed from the mold, and the belt material is cut into a ring, whereby the toothed belt 1 is obtained.

<Evaluation of toothed belt>-Example-A glass cord is used as the tensile member 2, chloroprene rubber is applied to the tooth rubber 3 and the back rubber 4, and a nylon canvas fabric is used for the tooth cloth 5. Thus, a toothed belt was manufactured by the above-described manufacturing method.

Comparative Example A toothed belt was manufactured by using the same material and method as in the example, except that the above-mentioned nylon cloth which had been subjected to an adhesive treatment with an RFL solution and rubberized was used as the tooth cloth 5.

-Belt Noise Test- As shown in FIG. 4, a test belt 15 is wound around a driving pulley 14 and a driven pulley 13, and a set weight SW = 60 kgf is given to the driven pulley 13 so that the belt 1
5 was run at 750 to 4000 rpm, and the noise level was measured with the microphone 16. The width of the test belt 15 is 3
0mm, total length is 840mm, pulleys 13 and 14 have 24 teeth,
The pulley tooth profile is S8M. The distance between the microphone 16 and the pulley 14 is 100 mm.

The results are shown in FIG. According to the figure, the toothed belt of the example has a noise level reduced by about 5 to 10 dBA as compared with the toothed belt of the comparative example. It can be seen that the use of the fabric without rubberization is effective in reducing the belt noise.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a part of a toothed belt according to an embodiment of the present invention.

FIG. 2 is a sectional view showing a part of the belt.

FIG. 3 is an enlarged sectional view showing a part of the belt.

FIG. 4 is a diagram showing a mode of a belt noise test.

FIG. 5 is a graph showing the results of a belt noise test.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Toothed belt 2 Tensile body 3 Tooth rubber 4 Back rubber 5 Tooth cloth 6 Tooth surface 7 Bottom surface 8 Tooth side

Claims (3)

[Claims] 1. A tension member extending in the belt length direction, tooth rubber provided on the inner surface side of the tension member to form teeth at a constant pitch in the belt length direction, and a back surface of the tension member. A toothed belt comprising: a provided back rubber; and a tooth cloth that covers a surface on a side where the teeth of the belt are provided, wherein the tooth cloth is not subjected to an adhesive treatment with an adhesive liquid and is rubberized. A toothed belt formed of unwoven fabric or knitted fabric, wherein the fabric constitutes a tooth tip surface, a tooth bottom surface, and a tooth side surface. 2. The toothed belt according to claim 1, wherein the tooth rubber partially penetrates into the eyes of the tooth cloth at the tooth tip and the tooth side part, and the tooth rubber is formed on the tooth bottom at the tooth bottom part. A toothed belt that hardly penetrates the eyes. 3. The toothed belt according to claim 1, wherein the degree of penetration of the tooth rubber into the eyes of the cloth decreases gradually from the tooth tip to the tooth bottom. Toothed belt.