JPH0643857B2 - Block for V-belt - Google Patents

Description

TECHNICAL FIELD The present invention relates to a V-belt block used in a transmission 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 number of metal V-shaped blocks 3'are formed in the length direction of the laminated band 2.
(Only a part is shown) are provided in piles. These blocks 3'are held in a slidable state relative to the laminated band 2 in the band length direction.

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]

In the conventional V-belt block, since the band supporting surface 4 is provided on the upper portion of the block 3'as shown in FIG. 3, the operation of the band supporting surface 4 when passing over the pulleys 5 and 6 is performed. The radius R ₁ and the working radius R ₂ of the block 3 ′ are different from each other.

Therefore, the laminated band 2 and the block 3 ′ move at v (peripheral velocity) = R (action radius) × ω (angular velocity / constant) according to their respective action radii. That is, on the pulley, the angular velocity ω
Therefore, when passing over the pulley, the laminated band 2 and the block 3'are rotated together without causing relative slippage if the working radii of the pulleys 5 and 6 and the working radius of the block 3'are equal to each other. At this time, the peripheral speed v becomes faster as the peripheral position is closer to the 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 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 innermost band 2a becomes remarkable.

Further, since the conventional band supporting surface 4 is located above the friction surface (inclined surface) where the block 3'and the pulley are in contact with each other, the block 3'which is frictionally engaged with the pulley will not rotate. When it moves together, the reaction force generated in the innermost band 2a in contact with the band supporting surface 4 causes a moment in the direction of tilting the block 3 ', which causes unstable behavior of the block 3'on the pulley. May cause.

[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 a pair of left and right necks, a band support surface provided between the necks and in contact with the innermost band, and a pair of left and right blocks positioned on both sides of the block main body and in contact with pulleys. The inclined surfaces have the same length, and the distance from the half of the length of the inclined surface to the center of the pulley when rotating on the pulley is a working radius R ₃ that rotates at the same angular velocity as the pulley and It is characterized in that the band supporting surface is located on the working radius R ₃ .

[Action]

In the V-belt block, the distance from the center in the longitudinal direction of the inclined surface of the block body, that is, the surface in contact with the pulley, to the center of the pulley is the working radius of the block when passing over the pulley. In the V-belt block of the present invention, since the position of the band supporting surface of the block body with which the innermost band is in contact is made to coincide with the position of the central portion in the lengthwise direction of the inclined surface, the action radius of the block, The working radii of the band supporting surfaces are almost the same. Therefore, the working radii of the innermost band that comes into contact with the band supporting surface and the block when rotating on the pulley are substantially the same, and the peripheral speed difference can be eliminated.

Therefore, when the block moves along the straight line between the pulleys, relative slippage due to the difference in peripheral speed between the band supporting surface and the innermost band is eliminated, and the innermost band of the V-belt is compared to the conventional V-belt. Elongation and wear can be greatly reduced. Moreover,
The block supporting surface that is in contact with the innermost band is located at the vertical center of the friction surface between the block and the pulley, and the pair of left and right friction surfaces have the same length, so that the block frictionally engages with the pulley. When the wheel moves with the rotation of the pulley, the reaction force from the innermost band that is in contact with the band support surface is evenly applied to the friction surface between the block and the pulley, and the block driving force on the left and right friction surfaces is also left and right. The behavior of the block on the pulley will be stable, such as being even.

〔Example〕

The V-belt block 3 shown in FIG. 1 is used by stacking a plurality of V-belt blocks 3 in the lengthwise direction of the laminated band 2, as in the prior art shown in FIG.

The laminated band 2 includes a plurality of endless metal bands 2a,
2b ... 2n are stacked in the thickness direction. Each of the metal bands 2a, 2b ... 2n has a thickness of 0.1 mm as an example.
To about 0.2 mm of stainless steel.

The block 3 includes a block body 10 and a block body 10
And a lateral member 15 bridged between the neck portions 13 and 14. The block body 10 and the lateral member 15 are made of metal, FRP,
It is made of ceramics, cermet, etc. and has rigidity that does not substantially deform even when a load is applied. Also, the horizontal member 1
5 also serves as a reinforcing member for the neck portions 13 and 14.

The block body 10 includes a neck portion 1 provided on both left and right sides.
A band support surface 16 is formed between the metal plates 3 and 14. The band support surface 16 has a curved shape that is slightly convex in the width direction (direction parallel to the paper surface in FIG. 1) and thickness direction (direction orthogonal to the paper surface in FIG. 1). Is doing.

Further, a pair of left and right substantially v-shaped inclined surfaces 18 and 19 are provided on both sides of the block main body 10 in the width direction, on both sides of the band supporting surface 16. These inclined surfaces 18, 1
9 contacts the inner surface of the pulley.

The position of the band support surface 6 is set so that the center position C of the length 1 of the inclined surfaces 18 and 19 and the height of the band support surface 16 are substantially the same.

The V-belt block 3 having the above-described structure is provided with a large number of layers in the lengthwise direction of the laminated band 2 to form a V-belt for transmission, and the V-belt block 3 is stretched between a pair of pulleys as in the case of FIG. Passed. Each block 3 travels integrally with the laminated band 2 as the pulleys rotate, and the load is transmitted through the blocks 3.

The V-belt block 3 has an inclined surface 1 that contacts the pulley.
Distance R ₃ of from the central longitudinal portion C to the center of the pulley 8 and 19 becomes a substantial action radius of the block 3 when passed over the pulleys. The block 3 is a band supporting surface 1
Since the height of 6 is located at the central portion C of the inclined surfaces 18 and 19, the working radius of the block 3 and the working radius of the band support surface 16 are both R ₃ and coincide with each other. Since the band supporting surface 16 and the innermost band 2a rotate integrally with each other on the pulley, the innermost band 2
The action radii of a and the block 3 are substantially the same.

For this reason, relative slippage between the innermost band 2a and the block 3 due to the difference in action radius when passing through the pulley is eliminated, or even if relative slippage occurs, the amount thereof becomes small. In this way, the elongation and wear of the innermost band can be significantly reduced as compared with the conventional V belt. It should be noted that a relative slip is inevitably generated between the bands 2a, 2b ... 2n, but the relative speed difference is small due to the thin plate thickness of each band 2a, 2b. do not become.

〔The invention's effect〕

According to the present invention, there is a great effect in preventing the elongation and wear of the innermost band in contact with the block. Moreover, since the band supporting surface is located at the vertical center of the friction surface between the block and the pulley, and the lengths of the pair of left and right friction surfaces are equal to each other, when the block moves on the pulley, the block It is possible to avoid generation of a moment in the falling direction, and since the frictional engagement forces of the block with respect to the pulley are equal to each other on the left and right, the block can move in a stable state on the pulley.

[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 ... Laminated band, 3 ... V-belt block, 10 ...
… Block body, 16 …… Band support surface, 18,19…
… Sloping surface.

Front page continuation (72) Akira Tange Akira Tange, Shinisogo-cho, Isogo-ku, Yokohama, Kanagawa Nihon Hatsujo Co., Ltd. (72) Inventor Kiyo Kurimoto, Shinisogo-cho, Isogo-ku, Yokohama, Kanagawa In-house (56) References JP-A-55-100443 (JP, A) Actual development: S58-54545 (JP, U)

Claims (1)

[Claims] 1. A V-belt block which is used by stacking a plurality of endless band-shaped metal bands in a stacking band in the longitudinal direction, the block comprising a pair of left and right neck portions (13, 14). ) And a neck (1)
A pair of left and right slopes which are located between both sides of the band support surface (16) and the block main body (10) which are provided between the innermost band (2a) and contact with the pulley. It has a surface (18, 19) and when it goes around the pulley, the distance from the half of the length (l) of the inclined surface (18, 19) to the center of the pulley rotates at the same angular velocity as the pulley. action radius R ₃ and becomes and V-belt blocks, characterized in that positions the said band supporting surface (16) on the action radius R ₃ to.