JPS6235135A - V-belt block - Google Patents

Abstract

PURPOSE:To reduce the elongation and wear of the most inner band by providing a V-belt block with a pair of right and left inclined planes which are located on a band supporting plane and its both sides and brought into contact with a pulley, and positioning the height of the supporting plane at the middle in the longitudinal direction of the inclined plane. CONSTITUTION:A laminated band 2 is composed of plural metal bands 2a-2n which are laminated in thickness direction, and each of blocks 3 comprises a block body 10 and a constructive member 15 which is spanned between the neck parts 13, 14 of the block body 10. A band supporting plane 16 curves slightly outwards and convexly in both width and thickness directions. The central position C of the length of a pair of right and left inclined planes 18, 19 on the both sides of the band supporting plane 16 is made to approximately coincide with the height of the supporting plane 16, and each of the blocks 3 runs together with the band 2 as a pulley rotates to transmit a load through the blocks 3. Thus, the supporting plane 16 rotates with the most inner band 2 as one body, and velocity difference between the band 2a and the block 3 as well as that between each of thin bands 2a-2n therefore become so slight as to cause no practically troublesome wear.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a block for a V-belt used in a V-belt for power transmission.

[Conventional technology]

V-belt (CVT) used in continuously variable transmissions of automobiles, etc.
V-belt 1 shown in FIG.
It is configured as follows. That is, the laminated band 2 includes a plurality of metal bands 2 (approximately 10 to 20 pieces) forming an endless band shape.
A, 2b, . . . , 2n are stacked in the thickness direction, and a large number of metal V-shaped blocks 3' (only some of which are shown) are stacked in the longitudinal direction of the laminated band 2. These blocks 3' are held slidably relative to the laminated band 2 in the longitudinal direction of the band.

The V-belt 1 is stretched between a pair of pulleys 5 and 6 having a fixed distance between their axes, and power is transmitted through each block 3'. One pulley 5 consists of a pair of conical plates facing each other in the axial direction, and the other pulley 6 also consists of a pair of conical plates facing each other in the axial direction. Then, by moving each conical plate relatively in the axial direction of the rotating shafts 8 and 9 by hydraulic control or the like and changing the distance between the conical plates, the contact position of each block 3' is changed in the radial direction of the pulleys 5 and 6. let In this way, the rotation ratio, that is, the gear ratio is changed steplessly, and the belt 1 is stretched without slack. FIG. 3 shows an example of the shape of a conventional block 3'.

[The problem that the invention attempts to solve]

In the conventional V-belt block, as shown in FIG. 3, the bunt support surface 5 is provided on the second part of the block 3', so that the bunt support surface 5 when passing over the pulleys 5 and 6 is The working radius R1 of the block 3' and the working radius R2 of the block 3'
are different from each other.

Therefore, the laminated band 2 and the block 3' move at (circumferential speed) - R (action radius) x ω (angular velocity, constant) according to their respective operating radii. In other words, since the angular velocity Cυ is constant at pulley "2", when passing through pulley "-", the laminated band 2 and block 3' will experience relative slippage if the radius of action of pulleys 5, 6 and the radius of action of block 3' are equal. They rotate as one without any generation, but the circumferential speed V at this time is much faster for those located on the outside. Therefore, when traveling between the pulleys 5.degree. 6, the laminated band 2 and the block 3' slip relative to each other due to the above-mentioned peripheral speed difference. In this way, the laminated band 2 and the block 3' are worn out or stretched at their contact portions, resulting in a shortened lifespan.

Such relative slipping also occurs between the bands 2a, 2b, . , the elongation and wear of the innermost hand 2a become significant.

[Means for solving problems]

INDUSTRIAL APPLICATION This invention is applied to the block for V-belts used by stacking a large number of endless belt-shaped laminated bands in the length direction.

In the present invention, the block includes a band support surface in contact with the laminated band and a pair of left and right sloped surfaces located on both sides of the band support surface and in contact with the boot, and the height of the band support surface is 2. It is characterized in that it is located at the center in the length direction of the foot slope.

[Effect]

In the V-belt block, the distance from the longitudinal center of the inclined surface of the block body, that is, the surface in contact with the pulley, to the center of the bobbin is the radius of action of the block when passing over the pulley. In the V-belt block of the present invention, the position of the band support surface of the block body with which the innermost band contacts coincides with the position of the longitudinal center of the inclined surface, so that the operating radius of the block and The operating radii of the band support surfaces are approximately the same. Therefore, the operating radii of the innermost band and the block that are in contact with the band support surface are almost the same, and the difference in circumferential speed can be eliminated.

Therefore, the relative slip between the innermost band and the block is eliminated when the radius of action is equal to the radius of action of the pulley, and the relative slip is slight even when the radius of action is different from the radius of action of the pulley. In this way, elongation and wear of the innermost band can be significantly reduced compared to conventional V-belts.

〔Example〕

A large number of V-belt blocks 3 shown in FIG. 1 are stacked in the longitudinal direction of the laminated band 2, similar to the prior art shown in FIG. 2.

The laminated band 2 includes a plurality of endless metal bands 2a,
2b...2n are stacked in the thickness direction. Each metal band 2a, 2b...2n has a thickness of, for example, 0.
It is made of stainless steel with a thickness of about 1 mm to 0.2 mm.

The block 3 includes a block body 10 and a block body 10.
The frame consists of a transverse member 15, which is passed between the necks 13, 14 of the frame. The block body 10 and the horizontal member 15 are made of metal, FRP,
It is made of ceramic, cermet, etc., and has a rigidity that does not substantially deform even when a load is applied. In addition, the horizontal member 1
5 also serves as a reinforcing member for the neck portions 13 and 14.

The block body 10 has neck portions 13 provided on both left and right sides.
．． A band support surface 16 is formed between the bands 14 and 14. This band support surface 16 has a curved shape slightly convex outward in the width direction (direction parallel to the paper surface in FIG. 1) and thickness direction (direction perpendicular to the paper surface in FIG. 1). is doing.

Further, on both sides of the block body 10 in the width direction, a pair of left and right approximately square-shaped inclined surfaces 18 and 19 are provided, located on both sides of the band support surface 16.

These inclined surfaces 18,19 abut the inner surfaces of the pulleys.

The position of the band support surface 16 is set so that the center position C of the length of the inclined surface 18, 19 and the height of the band support surface 16 substantially match.

A large number of V-belt blocks 3 having the above structure are stacked in the length direction of the laminated band 2 to constitute a power transmission V-belt, and the blocks 3 are stretched between a pair of pulleys as in the one in FIG. passed on. As the pulley rotates, each block 3 moves integrally with the laminated band 2, and the load is transmitted through the block 3.

The V-belt block 3 has an inclined surface 1 in contact with the pulley.
The distance R3 from the longitudinal center C of 8.19 to the center of the pulley is the effective radius of action of the block 3 when passing over the pulley. The block 3 has a band support surface 1
6 is located at the center C of the inclined surface 18, 19, the radius of action of the block 3 and the radius of action of the band support surface 16 are both R3, which coincide with each other. Since the band support surface 16 and the innermost band 2a rotate together on the boom, the innermost band 2a
The radius of action of a and the block 3 are almost the same.

For this reason, the relative slip between the innermost band 2a and the block 3 due to the difference in radius of action when passing through the boob is eliminated, or even if relative slip occurs, the amount is negligible. In this way, elongation and wear of the innermost band can be significantly reduced compared to conventional V-belts. In addition, each band 2a.

Relative slippage inevitably occurs between bands 2b...20, but this relative speed difference is slight because the thickness of each band 2a, 2b...2n is thin, and wear does not pose a problem in practice.

〔Effect of the invention〕

According to the present invention, there is a great effect in preventing elongation and wear of the innermost hand that contacts the block.

[Brief explanation of drawings]

Fig. 1 is a front view of a V-belt block showing an embodiment of the present invention, Fig. 2 is a schematic side view of a belt transmission device, and Fig. 3 is a schematic side view of a belt transmission device.
The figure is a front view showing a conventional V-belt block. 2... Laminated band, 3... V-belt block, 1
0...Block body, 16...Band support surface, 18
゜19...Slope surface. Applicant's agent Patent attorney Takehiko Suzue Cause 1 Figure 2

Claims (1)

[Claims] This is a V-belt block that is used by stacking a large number of endless band-shaped laminated bands in the length direction. 1. A block for a V-belt, comprising a pair of left and right sloped surfaces that come into contact with the band support surface, and the height of the band support surface is located at a central portion in the length direction of the sloped surface.