JP2908250B2 - V-ribbed belt - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a V-ribbed belt.
More specifically, the present invention relates to a V-ribbed belt used for general industry, automobiles, agricultural equipment, and home appliances.

[0002]

2. Description of the Related Art A V-ribbed belt, which is a kind of power transmission belt, is thinner than a V-belt and therefore has less bending stress. Notable. Also, compared to the V-belt, the V-ribbed belt has many advantages such as a reduction in belt tension caused by sinking into the pulley groove during driving, and thus has a longer belt life, and is used for general industrial purposes. It is steadily expanding for automobiles, agricultural equipment and home appliances.

In this type of V-ribbed belt, a plurality of V-shaped ribs extending in the longitudinal direction of the belt are integrally formed inside a flat belt-shaped tension layer in which a tension rope is embedded in an adhesive rubber layer. What is formed by molding, this tensile body layer is one or more layers of canvas with rubber attached to the back,
Alternatively, a structure in which a rubber layer is simply adhered to the back surface is known.

In this V-ribbed belt, aramid short fibers having a short fiber diameter of 1.5 to 2.0 denier are embedded in a compression rubber layer forming a V-shaped rib while maintaining the orientation in the belt width direction. The purpose is to improve the abrasion resistance by increasing the lateral pressure resistance of the friction transmission part of the belt by making it entangle, and further exposing a part of the buried short fibers to both side walls of the rib transmission part. Thus, these belts are widely known.

[0005]

However, the V-ribbed belt having the above-mentioned structure has a reverse bending pulley diameter of 50 to 7 mm.
When the diameter of the small pulley is 5 mmφ, a crack is generated at the bottom of the rib in a relatively short time. Therefore, in a drive device using the reverse bending small pulley diameter, there is a problem that the bending life of the belt is shortened.

The present invention has been made in view of the above-mentioned situation, and has been accomplished as a result of various studies for solving the problem.
It is an object of the present invention to provide a V-ribbed belt capable of improving a rubber compounding of a compression rubber layer forming a mold rib and greatly improving a belt bending life in a reverse bending small pulley diameter.

[0007]

In order to achieve the above object, the present invention has the following features. That is, a compression rubber layer in which short fibers are oriented and buried in the belt width direction and a plurality of V-shaped ribs extending in the belt longitudinal direction are arranged in parallel on the lower surface of the tensile body layer in which the tensile body in the adhesive rubber layer is embedded. V-ribbed belt having a compression rubber layer of 0.7 to 0.9 denier.
In V-ribbed belt small diameter of short aramid fibers Le is composed of a rubber compound which is embedded in the hydrogenated nitrile rubber
is there.

[0008]

When a small diameter aramid short fiber is oriented and mixed in the width direction of the belt into a compressed rubber layer made of hydrogenated nitrile rubber forming a V-shaped rib of a V-ribbed belt, it is slightly bent when it is reversely bent on a small pulley diameter. Since the space between the small-diameter aramid short fibers is expanded, the bending resistance (bending resistance) of the compressed rubber is reduced, and cracks on the rib bottom surface are less likely to occur.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described in more detail with reference to the accompanying drawings. FIG. 1 is a partial cross-sectional view of a V-ribbed belt according to the present invention. A V-ribbed belt body 1 includes a tension member 2 made of a low-stretch, high-strength rope such as polyester, nylon, aramid, carbon, or glass fiber, and NR. , SBR, CR, NBR, HNBR,
A flat belt-shaped tensile member layer 4 embedded in a single material such as CSM or polyurethane or an adhesive rubber 3 obtained by blending them is disposed at the center. 1 to
A plurality of rubberized canvases 5 are laminated and attached, while the other
A compressed rubber layer 6 is provided under the compressed rubber layer 6, and a plurality of V-shaped ribs 7 extending in the belt longitudinal direction are provided below the compressed rubber layer 6.
And a belt structure having the following.

The compressed rubber layer 6 is a feature of the present invention, and is made of a hydrogenated nitrile rubber (HNBR), and has a very small diameter, that is, a length of 0.7 to 0.9 denier. Aramid short fibers having a length of 1 to 3 mm are rubber 10
It is oriented and mixed so as to be in the belt width direction within the range of 5 to 15 parts by weight with respect to 0 parts by weight.

When the diameter of the short fiber is smaller than 0.7 denier, the dispersion of the short fiber becomes worse because the fiber is elongated and easily entangled. On the other hand, when the diameter is 0.9 denier or more, the bending resistance becomes large, and the crack at the rib bottom is reduced. It occurs early. Further, when the length of the short fiber is less than 1 mm, the reinforcing property is reduced and the lateral pressure resistance is reduced. On the other hand, when the length of the short fiber is 3 mm or more, the dispersibility is deteriorated. Furthermore, if the mixing amount of the small diameter short fibers is less than 5 parts by weight,
On the other hand, when the wear resistance is 15 parts by weight or more, the wear resistance is good, but the cost increases and the dispersibility with rubber also deteriorates.

[0012]

EXPERIMENTAL EXAMPLE Next, a V-ribbed belt (3PK1) shown in FIG.
V-ribbed belt 1 of the present invention in which 10 parts by weight of aramid fiber having a short fiber diameter of 0.8 denier is mixed with 100 parts by weight of rubber in the compressed rubber layer of 100), and 1.5 denier in the compressed rubber layer. A conventional V-ribbed belt 10 in which the same parts by weight of aramid fibers were mixed with a conventional V-ribbed belt 10 having a diameter of 120 mm as shown in FIG.
The belt is suspended between a driving pulley (Dr) and a driven pulley (Dn) having the same diameter as the driving pulley.
The back surface of the belt is pressed by an idler pulley Id having a diameter of 50 mm so that the driving pulley (D) becomes 0 kgf / 3 PK.
r) was run at a rotation speed of 3600 rpm, and the durability life of the belt was measured.

As a result, the durability life of the belt of the present invention is 40
At 0HRS, it was confirmed that the belt had a durability of about 1.4 times that of the conventional belt of 290HRS.

[0014]

As described above, in the V-ribbed belt according to the present invention, a small diameter aramid short fiber is formed on a hydrogenated nitrile rubber as a compressed rubber layer serving as a V-shaped rib so that the orientation direction of the short fiber is in the belt width direction. , The bending life of the belt in a drive device using a small reverse bending pulley diameter can be greatly improved. Furthermore, the use of small pulleys makes it possible to reduce the weight of the entire belt drive device,
Additional effects such as cost reduction can be expected.

[Brief description of the drawings]

FIG. 1 is a partial sectional view of a V-ribbed belt according to the present invention.

FIG. 2 is a schematic diagram showing a running test with a driving device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 V-ribbed belt 2 Tensile body rope 3 Adhesive rubber layer 4 Tensile body layer 5 Canvas with rubber 6 Compressed rubber layer 7 V-shaped rib 8 Small diameter short fiber

Claims (1)

(57) [Claims] 1. A compression method in which short fibers are oriented and buried in a belt width direction and a plurality of V-shaped ribs extending in a belt longitudinal direction are arranged in parallel on a lower surface of a tensile body layer in which a tensile body is buried in an adhesive rubber layer. In a V-ribbed belt having a rubber layer, the compressed rubber layer is composed of a rubber compound in which aramid short fibers having a small diameter of 0.7 to 0.9 denier are embedded in hydrogenated nitrile rubber. V-ribbed belt.