JPH0557484U - V belt for power transmission - Google Patents

Abstract

(57) [Summary] [Object] To provide a power transmission V-belt having a longer life than conventional belts at the same processing cost and molding time as the conventional one by modifying the tension member of the power transmission V-belt. [Structure] In a power transmission V-belt 1, wherein a tension layer 3 is embedded spirally in the longitudinal direction of the belt, and a stretching layer 4 and a compression layer 5 are laminated and attached on both upper and lower sides of the tension layer, respectively. The tensile rope 3 is a flat monofilament having a ratio of major axis to minor axis in the range of 1.5 to 10, and the minor axis of its cross section is made to coincide with the height direction of the V-belt 1. V-belt for power transmission characterized by being embedded.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a power transmission V-belt, and particularly to a power transmission V-belt having a small belt thickness.

[0002]

[Prior Art]

 The V-belt is made of a flexible material such as rubber embedded in a tension rope and is formed into a ring shape and a trapezoidal cross section. It is universal for driving general industrial machinery and automobile auxiliary equipment. Is used for. As shown in FIG. 3, a conventional V-belt generally uses a cord rope formed by twisting multifilament yarns of polyester, nylon, aramid or the like as the tension rope 13 of the transmission belt 10 and its cross section. It has been considered that the shape should be as close to a perfect circle as possible from the viewpoint of bending fatigue resistance and workability. These tensile body ropes 13 are usually used for the belt 10 after being subjected to an adhesive treatment, but in order to further increase the adhesive effect, the adhesive rubber layer 2 between the stretched rubber layer 4 and the compressed rubber layer 5 is used. Used in combination. Considering the life of the belt, the adhesive rubber layer 2 is necessary, and the adhesive rubber thickness is naturally thicker than the thickness of the tension rope 13.

On the other hand, in order to prolong the service life of the belt, it is preferable that the thickness of the belt is thin, and it is difficult to make the thickness of the compression rubber layer 4 thin due to wear, transmission characteristics, etc. Therefore, the adhesive rubber layer 2 can be made thin. Will be needed. If the adhesive rubber layer 2 is thinned, it is inevitably necessary to reduce the thickness of the tensile body rope 13 embedded therein. Even in the case of a belt having no adhesive layer which improves the adhesiveness between the tension rope 13 itself and the stretch rubber layer 4 and the compression rubber layer 5 as another belt structure, the thinner tension layer is preferable. The tensile strength rope 13 is required to have a small thickness in order to improve the flexibility and to improve the belt life.

[0004]

[Problems to be Solved by the Invention] However, in the case of using a conventional tension rope of a perfect circle, the thickness can be reduced by changing the twisting configuration and decreasing the fineness. In order to maintain the strength of the belt, it is necessary to reduce the spinning pitch of the tensile body rope, which increases the length of the tensile body rope per belt, greatly increasing the processing cost and increasing the cost of molding. The disadvantage is that the spinning time also increases. Further, since the cord is a perfect circle, the diameter can be reduced by only a little less than 30% even if the fineness is halved, which is not suitable for thinning the rubber of the adhesive rubber layer or the tensile body layer.

Therefore, an object of the present invention is to provide a transmission V-belt which has a longer life than the conventional one with the same processing cost and molding time as the conventional one by improving the conventional transmission V-belt. To do.

[0006]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, a feature of the present invention is that a tension rope is embedded in a spiral shape in the belt longitudinal direction, and a tension layer and a compression layer are laminated on the upper and lower surfaces of the tension layer, respectively. In the V-belt for power transmission which is adhered, the tensile body rope is a flat monofilament having a ratio of major axis to minor axis in the range of 1.5 to 10 and a minor axis of its cross section. Is a V-belt for power transmission in which the V-belt is buried by being aligned with the height direction of the V-belt.

[0007]

【Example】

 Hereinafter, a specific embodiment of the present invention will be described. FIG. 1 is a sectional view of a V-belt according to a specific embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a power transmission V-belt of the present invention, which is a V-belt usually called a low edge V-belt. Reference numeral 2 denotes a single material such as NR (natural rubber), SBR (styrene / butadiene rubber), CR (chloroprene rubber), BR (butadiene rubber), or an adhesive rubber layer formed by appropriately blending these, and at the central portion. A low-strength, high-strength tensile rope 3, such as polyester, nylon, or aromatic polyamide, is embedded. An expanded rubber layer 4 and a compressed rubber layer 5 are laminated on the upper and lower sides of the adhesive rubber layer 2, respectively, and both layers are mainly made of the same rubber as the adhesive rubber layer 2, but the compressed rubber layer 5 contains short fibers. Since 6 is orientated in the lateral direction of the belt, the hardness is higher than that of the material of the adhesive rubber layer 2.

Needless to say, the short fibers 6 may or may not be included in the stretched rubber layer 4 and the compressed rubber layer 5 as needed. The V-belt 1 of this embodiment is formed in a trapezoidal cross-sectional shape, and canvases 7 and 8 with rubber are laminated and adhered to the uppermost surface, that is, the upper surface of the stretched rubber 4 and the bottom surface of the compressed rubber layer 5. A feature of the embodiment of the present invention is that the tensile member rope 3 embedded in the adhesive rubber layer 2 is a monofilament having a flat cross-sectional shape, and the minor diameter of the monofilament cross section is V-belt. It is embedded in a spiral shape so as to match the height direction of 1. Moreover, the ratio of the major axis to the minor axis of the cross-sectional dimension of this flat monofilament is in the range of 1.5 to 10.

Here, if the ratio of the major axis to the minor axis of the tensile body rope 3 is less than 1.5, the flattening effect is small and the adhesive rubber layer 2 forming the tensile body layer cannot be thinned. On the other hand, when this ratio is 10 or more, when the tensile body ropes 3 are embedded in a spiral shape, the tensile body ropes 3 are likely to overlap each other, and the fiber axis of the tensile body ropes 3 is oblique to the longitudinal direction of the belt. If this happens too much, the strength of the belt will decrease and problems such as overturning and twisting during running will occur, making it impossible to improve the intended belt life.

Although the low edge V-belt has been described as an example of the transmission V-belt, a flat monofilament is used for the tension rope 3 of the V-ribbed belt 1 having V-ribs in the compression layer 5 as shown in FIG. However, the use of flat monofilament as the tension rope is not limited to the belt type. Further, in FIGS. 1 and 2, the monofilament of the tensile body rope 3 having a flat cross section is embedded in the adhesive rubber layer 2, but if there is no problem with the adhesiveness with the tensile body rope, the monofilament is bonded. It goes without saying that a belt structure without a rubber layer may be used.

[0011]

[Effect of the device]

 The power transmission V-belt of the present invention is a flat monofilament rope in which the ratio of the major axis to the minor axis of the tensile rope embedded in the tensile body layer is in the range of 1.5 to 10. Or, it is effective in extending the belt life by reducing the thickness of the tension body layer, and at the same time, it is possible to drastically reduce the rope processing cost by eliminating the need for twisting by changing from conventional multifilament to monofilament. Is.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a low edge V-belt according to a specific embodiment of the present invention.

FIG. 2 is a cross-sectional view of a V-ribbed belt according to another embodiment of the present invention.

FIG. 3 is a cross-sectional view of a conventional low edge V belt.

[Explanation of symbols]

 1 V-belt for transmission 2 Adhesive rubber layer 3 Tensile rope 4 Extension rubber layer 5 Compressed rubber layer 6 Short fibers 7 Canvas with rubber 8 Canvas with rubber

Claims (1)

[Scope of utility model registration request] 1. A V-belt for power transmission in which a tension layer and a compression layer are laminated and laminated on the upper and lower surfaces of a tension layer in which a tension rope is embedded in a spiral shape in the belt longitudinal direction. The tension rope has a ratio of major axis to minor axis of 1.
A V-belt for power transmission, wherein the V-belt is a flat monofilament in the range of 5 to 10, and the cross-section is embedded with its minor axis aligned with the height direction of the V-belt.