JPH038824Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a V-belt mainly used in transmission devices of automobiles, combines, tractors, etc.

(Prior Art) In recent years, development of belt-type continuously variable transmissions for automobiles, combine harvesters, tractors, etc. has been progressing with the aim of improving operability and fuel efficiency.

The belt used in this transmission requires an extremely high torque transmission capacity, and conventional rubber belts buckle and deform due to high lateral pressure, making them unusable. As a V-belt that improves this point,
A plurality of blocks are engaged with a pair of endless tension bands whose core is a cord made of synthetic or inorganic fibers through engagement grooves on both sides of the bands, and both sides are approximately aligned with the pulley groove surface. A flat inclined surface has been proposed (for example, Japanese Patent Application Laid-Open No. 1989-1999).
(See Publication No. 49151).

(Problems to be solved by the invention) The conventional V-belt described above has many excellent features such as good flexibility, no buckling deformation even when subjected to high lateral pressure, and safety in high-speed operation. However, if the block is made of a material with relatively low thermal conductivity such as high-strength resin or hard rubber, the frictional heat or tension generated at the engagement part between the tension band and the block during operation will increase. There has been a problem in that heat due to repeated bending of the band is accumulated, thermally deteriorating the block material and tension band material and impairing their durability.

In view of the above-mentioned problems of the conventional technology, the present invention provides a tension band with a core body made of strong steel such as maraging steel, and exposes a part of the core body to the outside. The generated heat is efficiently radiated from the exposed portion of the core body, reducing the effects of thermal deterioration on blocks and tension bands, providing a V-belt with excellent durability, and further improving the flexibility of the belt. The purpose is to enable a compact design.

(Means for Solving the Problems) In order to achieve the above object, the solving means of the present invention targets a V-belt in which a plurality of blocks are engaged with a pair of endless tension bands. The tension band includes a core made of strong steel such as maraging steel, and a rubber member that is cast around the core with parts exposed at regular intervals in the longitudinal direction, and is engaged with the block. It consists of. The blocks are arranged in parallel to the tension band at regular intervals in the longitudinal direction so as to expose the core exposed portion of the tension band to the outside.

(Function) The above means works because the core of the tension band is made of strong steel such as maraging steel, and a part (exposed part) of the core is exposed to the outside through the gap between the blocks. The heat generated in the belt is efficiently dissipated to the outside from the exposed portion of the belt through the core body, reducing the effects of thermal deterioration on blocks and tension bands and improving durability. The flexibility of the belt is improved by reducing its thickness by increasing the strength of the body, by exposing a part of the core body, and by providing intervals between the blocks for this purpose.

(Example) Hereinafter, an example of the V-belt of the present invention will be described in detail with reference to the drawings.

The V-belt 1 for a speed change pulley of this embodiment includes a pair of endless tension bands 2 and 3, and these tension bands 2,
3 and a plurality of blocks 4 which are fixed at a constant pitch and at constant intervals in the longitudinal direction.

The tension bands 2 and 3 each have a flat band-shaped core body 9 and 9,
Rubber members 10 and 11 hold the core bodies 9 and 9 in a cast-encased manner with parts exposed at regular intervals in the longitudinal direction, and woven fabric 12 embedded in the upper and lower surfaces of the rubber members 10 and 11. It is composed of. The outer surfaces 2a, 3a of the tension bands 2, 3 have approximately the same slope as the side surfaces 4a, 4b of the block 4, and the inner surfaces 2b, 3b are vertical. The outer surfaces 2a and 3a are connected to a pulley 21 as shown in FIG.
When it is fitted into the groove of the pulley 21 and is not receiving lateral pressure, it protrudes slightly from the side surfaces 4a and 4b of the block 4, but as shown in Fig. 3, when it is fitted into the groove of the pulley 21 and power transmission is performed. Due to the difference in compression Young's modulus, they are flush with the side surfaces 4a and 4b of the block 4, and are in contact with the pulley groove surface.

Strong steel such as maraging steel is used for the core bodies 9, 9 of the tension bands 2, 3, and the tensile strength of the belt,
It has significantly improved resistance to thermal deterioration and thermal conductivity. The core bodies 9, 9 are formed in the shape of a relatively thin flat strip due to their high strength and high rigidity, increasing the area that receives the lateral pressure of the block 4.

The rubber members 10 and 11 are made of well-known synthetic rubber that has a large compressive Young's modulus, has excellent abrasion resistance, and is reinforced with short fibers, so that the core bodies 9 and 9 do not come into contact with the block 4 or the pulley 21. It holds like that. Further, in the upper and lower surfaces of the rubber members 10 and 11, a woven fabric made of spun fibers such as cotton fibers and polyamide fibers having excellent flexibility and abrasion resistance is embedded.

The block 4 has a central base 5 made of a metal material with high thermal conductivity such as an aluminum alloy, and high-strength resin or hard rubber attached to both sides 5a and 5b of the central base 5, which have excellent wear resistance. It is formed from outer parts 6, 6 made of a different material.

Both side surfaces 4a and 4b of the block 4 are inclined so as to form a groove angle α of the speed change pulley 21, and both side surfaces 5a and 4b of the central base 5 form the same angle as the groove angle α.
outer surfaces 6a, 6 of outer parts 6, 6 glued to 5b;
It is formed by a. Top surface 4 of block 4
c and the lower surface 4d are formed into an arch-shaped convex surface and a concave surface, respectively, for the purpose of reducing the weight of the V-belt 1. One of the facing surfaces 4e between the blocks 4, 4 forms a vertical surface, and the other 4f forms a vertical surface upward from the center of the engagement grooves 7, 8 with the tension band, and downward from the same center forms a V-shaped surface. It is an inclined surface forming an angle β corresponding to the minimum pitch diameter used by the belt 1. Further, the outer parts 6, 6 are divided into upper and lower parts by these engaging grooves 7, 8.

In addition, as shown in Fig. 4, block 4
Engagement grooves 7, 8 are formed on both sides of the block 4, respectively, to open on the side surfaces 4a, 4b and engage with the rubber members 10, 11 of the tension bands 2, 3. It is divided into a pillar part and a lower beam part. The upper surfaces 7a, 8a and lower surfaces 7b, 8b of each engagement groove have protruding stripes 7c, 8c, 7d, 8d.
are provided for each. These convex portions 7c,
Corresponding to 8c, 7d, and 8d, grooves are provided on the upper and lower surfaces of the rubber members 10 and 11 of the tension bands 2 and 3 so as to engage with each other. With this configuration, the block 4 and the tension bands 2 and 3 form a power transmission means that restrains and fixes each other in the longitudinal direction of the V-belt 1 and is detachable in the width direction.

As shown in FIG. 5, a V-belt 30 as a modified example of the present invention is made of strong steel in order to expose a part of the core body 32 of the tension band 31 and dissipate the heat generated in the belt 30. The core body 32 is engaged with a block 34 via a rubber member 33 with a cog.
The blocks 34 are spaced apart at regular intervals to expose portions of the core 32. Further, the rubber member 33 with cogs and the block 34 are engaged with each other by arcuate projections and depressions at the lower part. The mutually opposing faces of the blocks 34 are vertical in the upper direction from the center of the tension band 31 and inclined downwardly in a symmetrical manner in the longitudinal direction at an angle β in the embodiment described above. In other respects, the configurations of the central base and the outer portions are almost the same as in the above embodiment, and the heat dissipation is similarly improved by partially exposing the core body 32 and the central base having high thermal conductivity.

(Effect of the invention) In the V-belt configured as above,
The heat generated by the relative sliding friction at the engagement part between the tension band and the block and the repeated bending of the tension band is efficiently transferred to the outside from the exposed part of the core through the strong steel core. Since heat can be dissipated, the effects of thermal deterioration of blocks and tension bands can be reduced and the durability of the belt can be improved. Further, by making the core thinner, exposing the core, and spacing between the blocks, the flexibility of the belt is further improved and a compact design becomes possible.

[Brief explanation of the drawing]

Figures 1 to 5 show an embodiment of the present invention. Figure 1 is a side view of the V-belt, Figure 2 is a sectional view taken along the - line in Figure 1, and Figure 3 shows the V-belt connected to the speed change pulley. A partial cross-sectional view of the V-belt blocks when they are fitted and in a power transmission state; FIG. 4 is a perspective view of the V-belt blocks;
FIG. 5 is a side view of a modified example of the V-belt of the present invention. 1... V belt, 2, 3, 31... Tension band, 4
...Block, 932...Mind-body, 10, 11, 3
3...Rubber member, 30...V belt, 34...Block.

Claims (1)

[Claims for Utility Model Registration] A V-belt consisting of a pair of endless tension bands in which a plurality of blocks are engaged; It consists of a rubber member that is cast around the body with parts exposed at regular intervals in the longitudinal direction and is engaged with the block, and the block exposes the exposed part of the core body of the tension band to the outside. V characterized in that the tension bands are arranged in parallel at regular intervals in the longitudinal direction so as to
belt.