JPH0559009U - V belt for power transmission - Google Patents

Abstract

(57) [Abstract] [Purpose] An object of the present invention is to provide a V-belt for power transmission, which is excellent in abrasion resistance on the side surface of the belt, crack resistance of the cover canvas, and durability of the belt even when it is run at high temperature and high load. To do. [Structure] An adhesive rubber layer 2 in which a core wire 3 made of a rope with low elongation and high strength is embedded, an expanded rubber layer 5 is arranged on an upper portion of the adhesive rubber layer 2, and a compressed rubber layer 7 is arranged on a lower portion thereof. A V-belt for power transmission in which one or more plies of cover canvas 4 is attached to the bottom surface of the compressed rubber layer 7,
As the warp yarns 8 in the belt width direction, aramid fiber yarns are used, and as the weft yarns 9 in the belt longitudinal direction, at least woolly yarns or stretchable yarns made of urethane elastic yarns are used.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a power transmission V-belt, and more particularly to a power transmission V-belt having improved wear resistance on the side surface of the belt, crack resistance of a cover canvas, and durability.

[0002]

[Prior Art]

 Today, many low-edge type V-belts are used as V-belts for automobiles. In this type of belt, a core made of rope with low elongation and high strength is embedded in the adhesive rubber layer, and the short fiber is underneath. Is provided in the belt width direction, and a stretched rubber layer is provided on the top. Then, a canvas with rubber is laminated on the surface of each of the compressed rubber layer and the expanded rubber layer.

[0003] This belt has a high transmission capacity because it has a larger friction coefficient than a wrapped belt wrapped with a canvas with rubber, and has a characteristic that the lateral pressure of the compressed rubber layer is large and the deformation is small in the pulley groove. have. Furthermore, the required quality of this type of belt is (1) low noise when driving the belt, (2) high lateral pressure resistance of the belt and long life, and (3) belt slip. Is small. Belts with such characteristics are widely used as transmission belts for heavy loads. Of the belt components used here, the cover canvas attached to the compressed rubber layer is made of cotton, nylon, polyester, etc. as warp yarns, weft bias fabrics, multi-axially stretchable Melias fabric, Alternatively, a triaxial woven fabric has been proposed.

[0004]

[Problems to be solved by the device]

 By the way, when conventional belts are run at high temperatures, it is necessary to improve not only the core wire but also the cover canvas. As an example, canvas made of aramid fiber yarn, which has excellent heat resistance and abrasion resistance, has come into use. This dramatically improved the durability of the belt. However, on the other hand, when the belt is run under high temperature and high load, the elasticity of the aramid fiber yarn is small, even if it is a wide-angle bias canvas with an intersection angle of 90 to 120 °. A crack was generated from the cover canvas laminated on the bottom of the compressed rubber layer. The present invention solves such a problem by providing a power transmission V-belt which is excellent in abrasion resistance on the side of the belt, crack resistance of the cover canvas, and durability of the belt even when traveling at high temperature and high load. The purpose is to provide.

[0005]

[Means for Solving the Problems]

 That is, the features of the present invention are that an adhesive rubber layer in which a core wire made of a rope with low elongation and high strength is embedded, an expanded rubber layer is arranged above the adhesive rubber layer, and a compressed rubber layer is arranged below the adhesive rubber layer. Then, in a power transmission V-belt in which at least one ply of cover canvas is attached to at least the bottom of the compressed rubber layer, as the cover canvas, aramid fiber yarn is used as the warp in the belt width direction and at least Woolley is used as the weft in the belt longitudinal direction. A V-belt for power transmission using a yarn containing a stretched yarn made of a processed yarn or a urethane elastic yarn.

[0006]

[Action]

 Such a power transmission V-belt receives a large lateral pressure from at least the pulley. On the bottom surface of the compression rubber layer, aramid fiber yarn is used as the warp in the belt width direction, and at least Woolley yarn or urethane elastic yarn is used as the weft in the belt longitudinal direction. By applying 1 ply or more of the cover canvas using the yarn containing the elastic yarn, the wear resistance in the belt width direction is improved, and the cover canvas is stretched in the belt longitudinal direction. Prevent the occurrence of cracks in the canvas and improve its life.

[0007]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a perspective view of a power transmission belt according to the present invention. The structure of the belt 1 includes an adhesive rubber layer 2 made of a rubber material such as NR, SBR, CR, HNBR or a mixture thereof. A core wire 3 made of a rope with low elongation and high strength is embedded in the core. An expanded rubber layer 5 made of the same material as the adhesive rubber layer 2 is provided above the adhesive rubber layer 2, and a short fiber 6 such as polyamide, polyester, vinylon or cotton is provided below the adhesive rubber layer 2. A compressed rubber layer 7 oriented in the belt width direction is laminated and integrated.

The cover canvas 4 has a plain weave, twill weave, satin weave, etc., and is laminated on at least one ply on the bottom surface of the compression rubber layer 7 or on the bottom surface and the extension rubber layer 5. There is. In this cover canvas 4, as shown in FIG. 2, the warp yarns 8 in the belt width direction (A) are aramid fiber yarns, and the weft yarns 9 in the belt longitudinal direction (B) are at least woolly processed yarns or urethane elastic yarns. It is made up of yarn including elastic yarn.

The warp yarns 8 are, for example, aramid fibers having trade names of Conex, Nomex, Kevlar, Technora, etc., 10 to 200 filaments of 1 to 6 denier are bundled, and 10 to 50 of them are twisted together. Includes denier multifilament yarn or spun yarn. In the case of a multifilament yarn, the abrasion resistance of the belt side face and the lateral pressure resistance in the belt width direction are improved, but on the other hand, the warp 8 becomes stiffer than the weft 9 and the stretchability of the weft 9 is prevented. For that reason, spun yarn is rather preferred. The thickness of this spun yarn is 20-40 count. The density of the warp yarns 8 is 80 to 140 yarns / 5 cm after the cover canvas 4 is heat-treated.

On the other hand, the weft 9 is a stretchable yarn made of urethane elastic yarn or nylon wooly processed yarn, or this stretchable yarn is made of polyamide, polyester such as 6 nylon, 6,6 nylon, 4,6 nylon and 12 nylon, A yarn obtained by twisting filaments such as polyvinyl alcohol and aramid is also included.

Further, according to the present invention, as shown in FIG. 3, a cog belt in which the cog portions 10 and the groove portions 11 extending in the width direction along the longitudinal direction of the compressed rubber layer 7 are alternately arranged at a required pitch may be used. Good.

Hereinafter, the effect of the present invention will be confirmed by a more specific experimental example. Conex (Teijin) 20 count for the warp yarn, 66 nylon (140D / 2) multifilament and 1 spandex (140D / 1) for the weft yarn are aligned and twisted, which is then woven as a plain weave, This canvas was heat-treated with a wins or a circular machine to shrink it, and the warp density was 105 threads / 5 cm. The light canvas was passed through a calendar and friction was performed to obtain a cover canvas (A).

On the other hand, another cover canvas composition is a plain weave in which Conex (Teijinsha) No. 20 count is used for the warp and the weft, and the bias cover canvas (B ) Is a plain weave in which the 20th cotton yarn is used for the warp and the weft, and is a bias-shaped cover canvas (C) in which the intersecting angle of the warp and the weft is 120 °. Table 1 shows the composition of these cover canvases.

[0014]

[Table 1]

An A-type low-edge belt (outer peripheral length 1010 mm) was produced using the cover canvas. A chloroprene rubber composition is used for the compression rubber layer, the adhesive rubber layer, and the extension rubber layer 5, and a polyester fiber rope is used as the core wire, and a 4-ply cover canvas (bottom canvas) is used for the compression rubber layer. ) Was laminated, while a two-ply cover canvas (surface canvas) was used for the stretch rubber layer. The obtained belts were run in running tests 1, 2, and 3, and the amount of wear on the side surface of the belt, the crack generation time of the bottom canvas, and the life of the belt were measured. The results are shown in Table 2.

[0016]

[Table 2]

The running test 1 is a vertical running test in which a belt is stretched around a biaxial pulley composed of a driving pulley having a diameter of φ60 mm and a driven pulley having a diameter of φ60 mm. After running at 3600 rpm and a dead weight of 90 kgf, the belt weight after 100 hours was measured to determine the amount of wear on the side surface of the belt.

In a running test 2, a belt was stretched around a triaxial pulley of a driving pulley having a diameter of 125 mm, a driven pulley having a diameter of 125 mm, and a tension pulley having a diameter of 70 mm, an ambient temperature of 85 ° C., and a rotation speed of the driving pulley. It was run at 4800 rpm, a load of 10 horsepower, and a load of 85 kgf applied to the tension pulley, and the time until the crack in the bottom canvas reaches the core was measured.

Further, the running test 3 was under substantially the same conditions as the running test 2, except that the atmospheric temperature was changed to 95 ° C. and the time until the crack in the bottom canvas reaches the core wire was measured.

As a result, the belt of the present invention has improved wear on the side surface of the belt despite the low warp density of the aramid fiber yarn. This shows the effect of using aramid fiber yarn in the belt width direction. Moreover, it can be seen that the bottom canvas is less likely to crack and the belt life is extended.

[0021]

[Effect of the device]

 As described above, in the power transmission V-belt of the present invention, at least the aramid fiber yarn is used as the warp in the belt width direction and the weft yarn is at least Woolley processed yarn in the belt longitudinal direction on the bottom surface of the compression rubber layer that receives a large lateral pressure from the pulley. Alternatively, by attaching one or more plies of cover canvas using a yarn containing elastic yarn made of urethane elastic yarn, the abrasion resistance in the belt width direction is improved, and the cover canvas is stretchable in the belt longitudinal direction. By giving the effect, it is possible to prevent the occurrence of cracks in the cover canvas and improve its life.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional perspective view of a power transmission V-belt according to the present invention.

FIG. 2 is a partial plan view of a cover canvas used for the power transmission V-belt of the present invention.

FIG. 3 is a partial cross-sectional perspective view of another power transmission V-belt according to the present invention.

[Explanation of symbols]

 1 Power transmission V-belt 2 Adhesive rubber layer 3 Core wire 4 Cover canvas 5 Stretch rubber layer 6 Short fiber 7 Compressed rubber layer 8 Warp 9 Weft

Claims (1)

[Scope of utility model registration request] 1. An adhesive rubber layer in which a core wire made of a rope with low elongation and high strength is embedded, an expanded rubber layer is arranged above the adhesive rubber layer, and a compressed rubber layer is arranged below the adhesive rubber layer, and at least a compressed rubber layer. In a power transmission V-belt having a cover ply of 1 ply or more attached to the bottom surface, a aramid fiber yarn is used for the warp in the belt width direction, and a weft yarn or urethane elastic yarn is used for the weft in the belt longitudinal direction. V-belt for power transmission characterized by using a yarn containing a stretchable yarn