JP2008115974A - Power transmission belt - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a belt having a long service life by improving the bending fatigue resistance of cover canvas, by freely selecting an angle formed by yarn corresponding to a warp and a weft, by maximally exhibiting a mechanical property of the yarn since the yarn corresponding to the warp and the weft of a weaving base material is arranged without bending, by using a multishaft-inserted warp knitting base material as the cover canvas. <P>SOLUTION: This power transmission belt 1 is provided by covering the periphery with the cover canvas 4 by forming an adhesive rubber layer 2 embedded with a conductor composed of a rope, an extension rubber layer 5 in an upper part of the adhesive rubber layer 2 and a compressed rubber layer 7 in its lower part. In the power transmission belt 1, at least the cover canvas 4 is the multishaft-inserted warp knitting base material. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a power transmission belt, and more particularly, to a power transmission belt having improved bending resistance in a power transmission belt in which a cover canvas is coated around a V belt.

  The cover cloth of the power transmission belt covers the outer periphery of the belt with the woven base material so that the bias direction of the woven base material coincides with the circumferential direction of the belt in order to improve the bending resistance of the belt. A normal weaving base has a bias angle of 90 degrees, and it is necessary to further increase the bias angle in order to increase the bending resistance. A method of mechanically spreading (tenter treatment) or a method using a special loom (Diagonal weaving, bag weaving) has been proposed.

  The use of a canvas having a bias angle of 90 degrees or exceeding this is described in Patent Document 1.

JP 2001-116087

  The present invention solves such problems, and by using a multi-axis inserted warp knitted base material as a cover canvas, the warp and weft yarns of the woven base material are arranged without bending. Therefore, the mechanical properties of the yarn can be maximized, the angle formed by the yarn corresponding to the warp and weft can be freely selected, the bending fatigue resistance of the cover canvas is improved, and a long-life belt is provided. For the purpose.

  The present invention is for power transmission in which an adhesive rubber layer in which a core wire made of a rope is embedded, an extension rubber layer on the upper side of the adhesive rubber layer, and a compression rubber layer on the lower side thereof are arranged and covered with a cover cloth. In the belt, at least the cover cloth is in a power transmission belt which is a multi-axis inserted warp knitted base material.

  A second aspect of the present invention is the power transmission belt according to the first aspect, wherein the multi-axis inserted warp knitted base material has two axes having a crossing angle of 90 degrees to 150 degrees.

  The invention according to claim 3 is the power transmission belt according to claim 1 or 2, wherein the power transmission belt is a V-belt or a V-ribbed belt.

  The present invention is for power transmission in which an adhesive rubber layer in which a core wire made of a rope is embedded, an extension rubber layer on the upper side of the adhesive rubber layer, and a compression rubber layer on the lower side thereof are arranged and covered with a cover cloth. In the belt, at least the cover cloth is a power transmission belt that is a warp knitted base material inserted into multiple axes, so that the mechanical properties of the cover cloth thread can be exhibited to the maximum, and yarns corresponding to warp and weft threads are formed. There is an effect that the angle can be freely selected.

  According to the invention described in claim 2, since the multi-axis inserted warp knitted base material is composed of two axes having a crossing angle of 90 degrees to 150 degrees, the power transmission belt according to claim 1, The belt strength is high, and there is an effect that the bending fatigue resistance is not impaired.

  According to the invention described in claim 3, since the power transmission belt is a V-belt or a V-ribbed belt, the power transmission belt according to claim 1 or 2 is used. By using the warp knitted base material, the mechanical properties of the yarn of the canvas can be expressed and the belt wear resistance and the bending fatigue resistance can be improved.

Hereinafter, the best mode for carrying out the present invention will be described.
FIG. 1 is an overall perspective schematic view of a V-belt according to an embodiment of the present invention. In FIG. 1, a cord 3 is embedded in an adhesive rubber layer in the V-belt, and an extended rubber layer 5 made of the same material as the adhesive rubber layer 2 is bonded to the upper part of the adhesive rubber layer 2. A compression rubber layer 7 is provided below the rubber layer 2, and the entire belt is surrounded by the cover canvas 4.

The cover canvas 4 is configured with a known warp knitted fiber material using a yarn made of cotton, nylon, polyester, vinylon, polyarylate fiber as a base material.
The warp knitted base material is obtained by warping at least two layers of fiber material, and the angle formed by the two layers is preferably 90 to 150 degrees. The first and second layers of the cover canvas have directions inclined at the belt back surface, side surface, and bottom surface as shown in FIG. 2 with respect to the belt longitudinal direction, and the belt longitudinal direction and the first fiber direction. It is preferable that the inclination angle θ1 formed by the belt and the belt longitudinal direction and the inclination angle θ2 formed by the fiber direction of the second layer are the same angle. Further, the crossing angle θ1 + θ2 formed by the fiber direction of the first layer and the fiber direction of the second layer is preferably 90 ° to 150 °.

  The compression rubber layer 7 is formed of two layers of an upper rubber layer 9 and a lower rubber layer 10, and the upper rubber layer 9 is a rubber made of natural rubber, styrene-butadiene rubber, nitrile rubber, chloroprene rubber alone, or a mixture thereof. On the other hand, the lower rubber layer 10 uses a rubber composition such as alkylated chlorosulfonated polyethylene, hydrogenated nitrile rubber, or a mixed polymer of hydrogenated nitrile rubber and unsaturated carboxylic acid metal salt.

  The chlorosulfonated polyethylene has a chlorine content of 15 to 35% by mass, preferably 25 to 32% by mass, and a low density polyethylene chlorosulfonated so that the sulfur content is in the range of 0.5 to 2.5% by mass. It is.

  Hydrogenated nitrile rubber is a rubber obtained by hydrogenating acrylonitrile-butadiene copolymer, and has a hydrogenation rate of 80% or more, and preferably 90% or more for exhibiting heat resistance and ozone resistance characteristics. good. Hydrogenated nitrile rubber having a hydrogenation rate of less than 80% has extremely low heat resistance and ozone resistance. In consideration of oil resistance and cold resistance, the amount of bound acrylonitrile is preferably in the range of 20 to 45%. The iodine value is 10 to 40 g / 100 g.

  For example, short fibers such as aramid, nylon, polyester, vinylon, and cotton may be added to the upper rubber layer 9 and the lower rubber layer 10 so as to be oriented in the belt width direction. Further, it is not necessary to separate the compressed rubber layer 7 into two layers of the upper rubber layer 9 and the lower rubber layer 10, and one layer may be used.

  Examples of the core wire 3 include organic fibers and glass fibers such as polyester fiber, polyamide fiber, and aramid fiber, and these core wires 3 are treated with an isocyanate solution, an epoxy solution, an RFL solution, and a rubber compound adhesive. A twisted cord or the like is used.

  The cover canvas 4 is subjected to RFL treatment, and then the rubber composition is subjected to a fiction coating to form a rubber canvas. The RFL liquid is obtained by mixing an initial condensate of resorcin and formalin into a latex. Examples of the latex used here include chloroprene, styrene / butadiene / vinylpyridine terpolymer, hydrogenated nitrile, NBR, and the like.

Next, the present invention will be specifically described with reference to examples.
(Example)
A rubber having the composition shown in Table 1 was kneaded by a normal method, and a rubber sheet having a predetermined thickness was prepared with a calendar roll. Further, as the cover canvas, two layers of fiber material, which is a known warp knitting using a canvas made of cotton, are used as a base material. The two layers were knitted and the angle between the two layers was 120 degrees.

Then, the strength of the canvas was measured with a test piece having a width of 30 mm and a length of 350 mm under the condition of a tensile speed of 200 mm / min. The results are shown in Table 2. In addition, a Taber abrasion test was performed with the canvas set to a load of 1 kgf, a wear wheel H-18, and a wear frequency of 1,000 times. The composition of the canvas and the results of the Taber abrasion test are shown in Table 2.
In Example 2, the first layer of the canvas was polyethylene terephthalate fiber (PET). The second layer was made of cotton fibers as in Example 1, and was composed of two known warp knitted fiber materials as a base material. The angle formed by the two layers was 120 degrees as in Example 1. And the strength measurement of a canvas and the Taber abrasion test were done like Example 1. Table 2 shows the composition of the canvas, the strength value, and the results of the Taber abrasion test.

As a comparative example, a conventional plain weave fabric is used as the canvas, the warp is cotton and the weft is also cotton as Comparative Example 1, and both warp and weft are mixed with cotton and polyethylene terephthalate (PET). 2. The crossing angle between the warp and the weft was 120 degrees. And the Taber abrasion test was done like the Example. Table 2 shows the composition of the canvas, the strength, and the results of the Taber abrasion test.

  From the results in Table 2, it can be seen that the canvases of Examples 1 and 2 have higher strength and lower wear rate due to Taber abrasion than the canvases of Comparative Examples 1 and 2.

In addition, a chloroprene rubber composition was frictioned on the canvas to obtain a canvas with rubber. A wrapped V-belt (upper width 16.5 mm, thickness 8.0 mm, length 1016 mm) was prepared using the rubber composition of the compression rubber layer shown in the table.

  As the core wire, a polyester filament (PEN) mainly composed of 1,000 denier ethylene-2,6-naphthalate and a 1,000 denier polyethylene terephthalate fiber (PET) are twisted 9.0 times / The untwisted cord with total denier of 24,000 or 26,400 was prepared by twisting in the up and down direction at 10 cm and the number of lower twists of 21.0 times / 10 cm to form a 3 × 8 twisted structure.

  Next, the untreated cord was pre-diped with 5 mass% of a polyisocyanate compound (PAPI-135: manufactured by M & D Kasei Co., Ltd.) with an isocyanate-based adhesive composed of 95 mass% of toluene, and then at about 170 to 180 ° C. After drying and dipping in an RFL solution (100 parts by weight of CR latex, 14.6 parts by weight of resorcin, 9.2 parts by weight of formalin, 1.5 parts by weight of caustic soda, 262.5 parts by weight of water), 200 to 240 ° C. A stretched heat-fixing treatment was performed to obtain a treatment code.

  The manufacturing method of this wrapped V-belt is as follows. That is, after winding a rubber sheet corresponding to a compression rubber layer in which an upper rubber layer having a thickness of 4 mm and a lower rubber layer having a thickness of 1.5 mm are laminated around a mantle, a core wire is spun, and an upper rubber layer and Wrap a rubber sheet corresponding to the same stretched rubber layer. The obtained belt was fitted into a ring mold and then vulcanized to finish a wrapped V belt.

1 is a schematic perspective view of a V belt according to the present invention. 1 is a schematic view of a multi-axis insertion warp canvas according to the present invention. It is the schematic of the plain weave fabric of a comparative example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Power transmission belt 2 Adhesive rubber layer 3 Core wire 4 Cover canvas 5 Stretch rubber layer 7 Compression rubber layer 9 Upper rubber layer 10 Lower rubber layer

Claims (3)

  In a power transmission belt in which an adhesive rubber layer in which a core wire made of a rope is embedded, an extension rubber layer on the upper side of the adhesive rubber layer, and a compression rubber layer on the lower side thereof are covered with a cover cloth. A power transmission belt, wherein the cover cloth is a multi-axis inserted warp knitted base material.   The power transmission belt according to claim 1, wherein the multi-axis inserted warp knitted base material has two axes having an intersecting angle of 90 degrees to 150 degrees.   The power transmission belt according to claim 1 or 2, wherein the power transmission belt is a V-belt or a V-ribbed belt.

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