JPH063245B2 - Block for V-belt - Google Patents

Description

TECHNICAL FIELD The present invention relates to a V-belt block used for a conductive V-belt.

[Conventional technology]

V-belt (CVT) used for continuously variable transmissions of automobiles
Belt) is a V-belt 1 shown in FIG. 2 as an example.
It is configured like. That is, the laminated band 2 is composed of a plurality of (10 to 20) metal bands 2a, which are endless bands.
2b ... 2n are stacked in the thickness direction, and a large number of metal V-shaped blocks 3 '(only a part is shown) are stacked in the length direction of the laminated band 2. These blocks 3 '
Are held in a slidable manner relative to the laminated band 2 in the length direction of the band.

The V-belt 1 is stretched between a pair of pulleys 5 and 6 having a fixed axial distance, and power is transmitted through each block 3 '. One pulley 5 is composed of a pair of conical plates that axially face each other, and the other pulley 6 is also composed of a pair of conical plates that axially oppose each other. Then, the contact positions of the blocks 3'are changed in the radial direction of the pulleys 5 and 6 by moving the respective conical plates relatively in the axial direction of the rotary shafts 8 and 9 by hydraulic control and changing the distance between the conical plates. 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 the conventional block 3 '.

[Problems to be solved by the invention]

When the V-belt 1 passes over the pulleys 5 and 6, the laminated band 2 and the block 3'have different operating radii γ.
I have

Therefore, the laminated band 2 and the block 3 ′ move at v (circumferential velocity) = γ (acting radius) × ω (angular velocity / constant) according to their respective action radii. That is, since the angular velocity .omega. Is constant on the pulley, the laminated band 2 and the block 3 ', when passing over the pulley, cause relative slip if the acting radius of the block 3'and the acting radius of the pulleys 5 and 6 are equal. However, the peripheral speed v at this time becomes faster as it is located outside. For this reason, when traveling between the pulleys 5 and 6, the laminated band 2
And the block 3'will slide relative to each other. In this way, the laminated band 2 and the block 3 ′ are worn or stretched at their mutual contact portions to cause a reduction in the life.

Such relative slippage also occurs between the bands 2a, 2b ... 2n, but especially the contact portion between the innermost band 2a and the block 3'has a large surface pressure and a large relative speed difference. The elongation and wear of the inner band 2a become remarkable.

[Means for solving problems]

INDUSTRIAL APPLICABILITY The present invention is applied to a V-belt block that is used by stacking a large number of endless belt-shaped laminated bands in the length direction.
In the present invention, the block includes a block main body having inclined surfaces on both sides in the width direction that are in contact with the pulley, and a support member provided on the block main body. At least the block main body has the support member. A first band supporting surface is formed inside the member and is in contact with the first band group, and the supporting member has a second band group or a third band group located outside the first band group. The second band supporting surface is formed so as to be in contact with the fourth band group.

[Action]

The laminated band used for the V-belt block having the above structure is divided into at least a first band group and a second band group positioned outside the band group. The first band group contacts the first band supporting surface provided on the block body, and the second band group contacts the second band supporting surface formed on the supporting member. Thus, at least two bands will be in contact with the block.

Therefore, compared with the conventional V-belt in which only one band is in contact with the block, even if the tension of the entire belt is constant, the number of bands in contact with the block is increased by the number of bands in contact with the block. The surface pressure of is reduced.

〔Example〕

The laminated band shown in FIG. 1 has a first band group 2 and
It is divided into a second band group 2 ′ located outside the band group 2. A large number of blocks 3 are used by stacking them in the length direction of the band groups 2 and 2 '.

The first band group 2 includes a plurality of endless metal bands 2
2a ... 2n are stacked in the thickness direction. The second band group 2'also includes a plurality of endless metal bands 2
A ', 2b' ... 2n 'are stacked in the thickness direction.
Each metal band 2a, 2b ... 2n, 2a ', 2b' ... 2
For example, n'is made of stainless steel having a thickness of about 0.1 mm to 0.2 mm. In the illustrated example, the second band group 2'is wider than the first band group 2. However, the band groups 2 and 2'may have the same width.

The block 3 includes a block body 10, a support member 11 provided on the block body 10, and a lateral member 15 bridged between the neck portions 13 and 14 of the block body 10. Block body 10, support member 11 and lateral member 15
Is made of metal, FRP, ceramics, cermet, etc. and has rigidity that does not substantially deform even when a load is applied. The lateral member 15 also functions as a reinforcing member for the neck portions 13 and 14. On both sides of the block body 10 in the width direction, substantially V-shaped inclined surfaces 18, 19 contacting the inner surface of the pulley are provided.
Is provided.

Further, the block body 10 has a recess 20 located inside the support member 11 and opening in the thickness direction of the block body 10.
Are formed. On both sides of this recess 20, the neck 1
Steps 21 and 22 are formed between 3 and 14. The supporting member 11 is attached to the step portions 21 and 22 by an appropriate holding means.

A first band support surface 25 that contacts the first band group 2 is formed on the bottom of the recess 20.

On the outer surface of the support member 11, the second band group 2 '
A second band support surface 27 is formed so as to come into contact with the second band support surface 27.
The band supporting surfaces 25 and 27 have a curved shape that is slightly outwardly convex in the width direction (direction parallel to the paper surface in FIG. 1) and the thickness direction (direction orthogonal to the paper surface in FIG. 1). Is doing.

The V-belt block 3 having the above-described structure is provided with band groups 2 and 2 '
A plurality of V-belts for transmission are formed by stacking a plurality of them in the lengthwise direction and are stretched between a pair of pulleys as in the case of FIG. Then, as the pulleys rotate, each block 3 travels integrally with the band groups 2 and 2 ', and power is transmitted through the block 3.

According to the V-belt of this embodiment, the first band group 2 located inside is in contact with the first band support surface 25 formed on the block body 10, and the second band group 2 ′ is the support member 11.
It contacts the second band support surface 27 formed on. As a result, the first and second band groups 2, 2'are both supported by the block 3.

Therefore, compared with a conventional V-belt in which only one band is in contact with the block, even if the tension of the entire V-belt is constant, the number of bands in contact with the block is increased. , One of the bands in contact with the block
The surface pressure per sheet decreases. That is, the first band group 2
And the tension distribution of the second band group 2'is equal,
The surface pressure of the innermost band group 2a, 2a 'in contact with the block 3 is half that of the conventional one, and the wear and elongation of the innermost band 2a, 2a' are significantly reduced as compared with the conventional product.

Although the band supporting surfaces 25 and 27 are formed at two places in the above-mentioned embodiment, the band supporting surfaces may be provided at three or more places depending on the case. For example, a third band support surface is formed by adding another support member (not shown) to the outside or the inside of the support member 11 described above, and the third band group is formed on the third band support surface. May be configured to be supported. In this case, the laminated band is divided into three inner band groups, outer band groups, and intermediate band groups, so that the number of bands in contact with the block 3 is three.

〔The invention's effect〕

According to the present invention, since the number of bands that come into contact with the block is plural, the surface pressure of the innermost band can be reduced, which is very effective in preventing wear and elongation of the innermost band.

[Brief description 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 V-belt transmission device, and FIG.
The figure is a front view showing a conventional V-belt block. 2 ... 1st band group, 2 '... 2nd band group, 3 ... V belt block, 10 ... Block main body, 11 ... Support member, 18, 19 ... Inclined surface, 25 ... 1st band support surface,
27 ... Second band support surface.

Claims (1)

[Claims] 1. A V-belt block which is used by stacking a large number of endless belt-shaped laminated bands in the length direction, the block main body having inclined surfaces in contact with pulleys on both sides in the width direction. , A support member provided on the block body, and at least the block body,
A first band supporting surface located inside the support member and in contact with the first band group is formed, and a second band group located outside the first band group is in contact with the support member. A V-belt block having a band supporting surface of 2.