JPH04248043A - V belt for transmitting high load - Google Patents

Abstract

PURPOSE:To improve ability to transmit high load. CONSTITUTION:A block 2 made of a synthetic resin is mounted on and fixed to a plurality of endless core wires in the longitudinal direction. The block 2 has an upper member 2A and a lower member 2B. Core wires 3 are held between the upper member 2A and the lower member 2B. The upper member 2A is coupled with the lower member 2B through a metal pin member in the vertical direction and adhesively secured to the core wires 3. By this, stress generated in the block 2 is reduced.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a V-belt for high-load transmission mainly used in continuously variable transmissions for automobiles.

0002

[Prior Art] Currently, gear-type or hydraulic-type transmissions are used in automobiles, combine harvesters, tractors, etc., but in recent years, belt-type transmissions have been used for the purpose of improving operability and fuel efficiency. Development of a gear transmission is progressing.

The belt used in this belt-type continuously variable transmission requires an extremely high torque transmission ability, and conventional rubber V-belts cannot withstand high lateral pressure and buckle, making them unusable.

Therefore, various high-load transmission V
Belts have been proposed (for example, Japanese Patent Laid-Open No. 46-4861)
No. 1, JP-A-55-27595, JP-A-56-
76745, JP-A-59-77147).

[0005] Also, the applicant also applied
As described in the above publication, a V-belt is proposed in which a plurality of blocks are locked to a pair of endless tension members by engagement of recesses and projections.

[0006]

By the way, in such a V-belt, as shown in FIG.
A plurality of blocks c that are locked are subjected to a pressing force F1 and a shearing force F2, and the maximum tensile stress is generated in the A1 and A2 parts in Fig. 6, and there is a risk that the A1 and A2 parts will break when a high load is applied. There is.

[0007] In order to solve these problems, we have tried embedding a metal reinforcing member in the block, using a high-strength resin material for the block, or changing the shape of the so-called part A, which is the base of the beam. However, improvements in these factors alone have now reached their limits, and no significant improvement in transmission capacity can be expected. Furthermore, when scaling up the belt or using metal reinforcing members, there is a large loss due to increased weight, which poses a problem in terms of belt life.

[0008] An object of the present invention is to provide a V-belt for high-load transmission with improved high-load transmission capability.

[0009]

[Means for Solving the Problems] The invention of claim 1 comprises a plurality of endless core wires and a block made of synthetic resin that is attached and fixed to the core wires in the longitudinal direction, and the side surface of the block is attached to the pulley. A V-belt for high-load transmission that contacts a pulley groove surface, wherein the block has an upper member and a lower member, the core wire is sandwiched between the upper member and the lower member, and the above-mentioned core wire is sandwiched between the upper member and the lower member. The upper member and the lower member are connected via vertical metal pin members and are adhesively fixed to the core wire.

According to the second aspect of the invention, an elastomer member is interposed between the blocks.

[0011]

[Operation] According to the invention of claim 1, the core wire is sandwiched between the upper member and the lower member of the block, and the upper member and the lower member are connected via the vertical metal pin member. Since it is adhesively fixed to the core wire, the stress generated within the block due to load is about half that of the conventional one.

According to the second aspect of the invention, the movement of the blocks is suppressed by the elastomer member between the blocks, and the elasticity of the conventional V-belt is maintained.

[0013]

Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

In FIGS. 1 to 3, reference numeral 1 denotes a V-belt for high-load transmission, and a plurality of blocks 2 whose left and right side surfaces 2a, 2a are in contact with pulley groove surfaces (not shown) of pulleys; It is constituted by a plurality of (for example, 10 to 15) endless core wires 3 that penetrate through the block 2 and are adhesively fixed to the block 2.

[0015] Between the blocks 2 and 2 is an elastomer.
A member 4 is interposed to suppress the movement of the blocks 2, 2 and maintain the elasticity of a conventional V-belt.

Further, as shown in FIGS. 4 and 5, the block 2 is vertically divided into an upper member 2A and a lower member 2B, with the center position of the through hole 5 through which the core wire 3 passes as a boundary. . An upper semicircular hole portion 5a forming the upper part of the through hole 5 is formed on the lower surface side of the upper member 2A, and a lower semicircular hole portion 5b forming the lower portion of the through hole 5 on the upper surface side of the lower member 2B. are respectively recessed at regular intervals in the left and right direction, and both members 2A, 2
By combining B, a through hole 5 through which the core wire 3 passes is formed. Each member 2A, 2B has upper and lower insertion holes 6, 7 into which vertical metal pin members (not shown) are inserted between the semicircular holes 5a, 5b. It is formed by

In manufacturing the above-mentioned V-belt 1 for high-load transmission, as shown in FIGS. 4 and 5, the block 2 is divided vertically into an upper member 2A and a lower member 2B, and the insertion holes 6, A metal pin member (not shown) is inserted into 7, and adhesive is applied between the lower surface of the upper member 2A and the upper surface of the lower member 2B, and the lower surface of the upper member 2A and the upper surface of the lower member 2B are This is done by joining and integrating. Therefore, the upper member 2
A and the lower member 2B are firmly connected by a bonding force that is a combination of the fitting force of the pin member and the adhesive force of the adhesive.

In that case, the endless core wire 3 is inserted into the through hole 5 before joining the upper member 2A and the lower member 2B.
It is necessary to position it inside (the semicircular holes 5a, 5b).

With the above structure, the core wire 3 is sandwiched between the upper member 2A and the lower member 2B of the block 2, and the upper member 2A and the lower member 2B are connected by vertical metal pin members. Since the belt is connected through the intermediary 5 and adhesively fixed to the core wire 3, the tension bands a and b of the conventional belt (see Fig. 6) become the core wire 3, making it more compact and more compact than the conventional belt. Moreover, the block 2 and the core wire 3 are integrated. At the same time, since block 2 does not have a beam structure like block c of conventional belts, extreme stress concentration is less likely to occur, and stress is evenly distributed inside block 2. . It has been confirmed by stress analysis using the finite element method that the stress generated in block c of the conventional belt was about 11 kgf/mm2, but it was reduced to about 6 kgf/mm2.

[0020] In this way, the stress generated in the block 2 in response to the load is about half that of the conventional one, so high load transmission is possible even with a block made only of synthetic resin, reducing the belt weight and extending the belt life. It can be extended. In addition, an elastomer member 4 is interposed between the blocks 2, 2 to suppress movement of the blocks 2, 2, so that the elasticity of the conventional V-belt is maintained. It has become.

[0021]

[Effects of the Invention] As described above, the invention as claimed in claim 1 is such that the core wire is sandwiched between the upper member and the lower member of the block, and the upper member and the lower member are connected through the vertical metal pin member. Since it is bonded and fixed with adhesive to the core wire, the stress generated within the block due to load is about half that of conventional blocks.
High load transmission is possible.

According to the second aspect of the invention, since the movement of the blocks is suppressed by the elastomer between the blocks, the elasticity of the conventional V-belt is maintained.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a V-belt for high-load transmission.

FIG. 2 is a sectional view of a V-belt for high-load transmission.

FIG. 3 is a side view of a V-belt for high-load transmission.

FIG. 4 is a front view of a block of a V-belt for high-load transmission.

FIG. 5 is a side view of a block of a V-belt for high-load transmission.

FIG. 6 is a perspective view of a conventional V-belt for high-load transmission.

[Explanation of symbols]

1 V-belt for high load transmission 2 Block 2A Upper member 2B Lower member 3 Core wire 4 Elastomer member

Claims (2)

[Claims] Claim 1: A V-belt comprising a plurality of endless core wires and a block made of synthetic resin that is attached and fixed to the core wire in the longitudinal direction, and the side surface of the block is in contact with the pulley groove surface of the pulley. The block has an upper member and a lower member, the core wire is sandwiched between the upper member and the lower member, and the upper member and the lower member are provided with a vertical metal pin member. A V-belt for high-load power transmission, characterized in that the V-belt is bonded to the core wire via the core wire and adhesively fixed to the core wire. 2. The V-belt for high-load transmission according to claim 1, wherein an elastomer member is interposed between the blocks.