JPS6235137A - Transmission belt - Google Patents

Abstract

PURPOSE:To stabilize the motion of a belt during its early operation by forming convex parts on one plane and concave parts on the other plane in the thickness direction of a block respectively, and making a distance to the tip of the convex part longer than that to the bottom of the concave part to permit the inclination of the convex part. CONSTITUTION:The height of a band supporting plane 16 of a block body 10 is made to coincide approximately with the central position C of the length h of inclined planes 18, 19 on the both sides of the band supporting plane 16. One plane in the thickness direction of the block body 10 and its other plane are provided with a pair of convex parts 21 and a pair of concave parts 22 corresponding to the parts 21 respectively, and the adjacent convex parts 21 fit into the concave parts 22. A distance l1 from the front part of a plane where the convex parts 21 are formed to the tip of the convex parts 21 is made longer than a distance l2 from the rear part of a plane where the concave parts 22 are formed to the bottom of the concave parts 22. Consequently, when the parts 21 have been fitted into the parts 22, the convex parts 21 can oscillate within a certain angle to the concave parts 22. Thus, the acting radius of the block 3 can coincide with that of the supporting plane 16 to prevent the great portion of their relative slip.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a transmission V-belt used in continuously variable transmissions and the like.

[Conventional technology]

Transmission V-belt (CV) used in continuously variable transmissions of automobiles
T-belt) is - for example, 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 stacked in the thickness direction, and a large number of metal blocks 3 (
(Only a portion is shown) These blocks 3
is held in a slidable state relative to the laminated band 2 in the longitudinal direction of the band.

The belt 1 consists of a pair of pulleys 5 having a fixed distance between their axes.
, 6, and power is transmitted through each block 3. One pulley 5 is made up of a pair of conical plates facing each other in the axial direction, and the other boot 96 is also made up of a pair of conical plates facing each other in the axial direction. Then, the contact position of each block 3 is changed in the radial direction of the pulleys 5 and 6 by moving each conical plate relatively in the axial direction of the rotating shafts 8 and 9 by hydraulic control and changing the distance between the conical plates. . In this way, the rotation ratio, that is, the gear ratio is changed steplessly, and the belt 1 is stretched without slack.

[Problem that the invention seeks to solve]

In this type of power transmission belt, power is transmitted through the blocks, so conventionally, load is transmitted between the blocks by bringing the facing surfaces of adjacent blocks into surface contact. Also, for example, JP-A-58-14
As seen in Japanese Patent Application Laid-open No. 9437 and Japanese Unexamined Patent Publication No. 58-34253, in order to position the blocks,
A structure may be adopted in which a convex portion is provided on one surface of the block and a recessed portion is provided at the same position on the other surface, and the convex portion and the recessed portion are fitted in adjacent blocks.

However, in any case, load transmission between the blocks is performed by surface contact between opposing surfaces of the blocks.

[Problem to be solved by the invention 3 As mentioned above, conventionally, load is transmitted by surface contact between blocks, so if the belt is new and has not been run-in sufficiently, , the contact surfaces of the blocks do not fit well with each other, and the blocks may come into contact with each other unevenly or the contact position may become unstable. For this reason, the movement of the belt may become unstable, especially at the beginning of use of the belt.

(c) Means for Solving Problems] The present invention is applied to a power transmission belt comprising an endless laminated band and a large number of blocks stacked one on top of the other in the length direction of the laminated band.

In the present invention, a convex portion is provided on one surface of the block in the thickness direction, and a concave portion that fits with the convex portion provided on an adjacent block is provided on the other surface. and a distance i1 from the foremost part of the surface on which the convex part is provided to the tip of the convex part is made longer than a distance 2 from the rearmost part of the surface on which the concave part is provided to the rear end of the concave part, Furthermore, the recess is shaped to allow the inclination of the convex part due to mutual inclination in the front-rear direction when the blocks run on the pulley, or the inner diameter of the recess is larger than the outer diameter of the convex part. shall be.

[Effect]

In the transmission belt configured as described above, the tip of the convex portion provided on each block abuts against the inner wall of the concave portion of the adjacent block, so that load is transmitted between the blocks via these convex portions and concave portions.

[Example 1] The power transmission V-belt 1 shown in FIG. 1 includes an endless belt-shaped laminated band 2 and a large number of pieces in the length direction of this laminated band 2, similar to the one shown in FIG. It consists of blocks 3 that are stacked one on top of the other.

The laminated band 2 includes a plurality of 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 m to 0.2 m.

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, ceramic, cermet, etc., and have 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 13.14.

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, a pair of left and right substantially V-shaped inclined surfaces 18 and 19 are provided on both sides of the block body 10 in the width direction, 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 (see FIG. 1) of the length h of the inclined surface 18.19 and the height of the band support surface 16 substantially match.

Further, on one surface of the block body 10 in the thickness direction, a pair of convex portions 21 are provided at symmetrical positions. The tip of the convex portion 21 has a hemispherical shape.

Further, on the other surface of the block body 10, a pair of recesses 22 are provided at positions corresponding to the projections 21. A convex portion 21 provided on an adjacent block fits into this concave portion 22 . The recess 22 is a spherical depression.

As shown in FIG. 2, the distance I41 from the frontmost part of the surface where the convex part 21 is provided to the tip of the convex part 21!
1 from the rearmost part of the surface where the recess 22 is provided to the recess 2
The distance to the far end of No. 2 is longer than No. 2. Further, the inner diameter d2 of the recess 22 is larger than the outer diameter d1 of the protrusion 21. Therefore, the convex portion 21 can swing within a certain angular range with respect to the concave portion 22 while remaining fitted into the concave portion 22.

The V-belt 1 having the above structure is stretched between a pair of pulleys in the same way as the one in FIG. Each block 3 moves integrally with the laminated band 2 as the pulley rotates. That is, when the tip of the convex portion 21 of one block 3 hits the inner wall of the concave portion 22 of the adjacent block 3,
One block 3 pushes the other block 3 via the convex portion 21 and the concave portion 22. In this way, force is transmitted between the blocks 3. In addition, the blocks 3 are positioned with respect to each other by fitting the convex portion 21 and the concave portion 22.

When the V-belt 1 runs on the pulleys, the adjacent blocks 3 are slightly inclined in the front-rear direction, as shown in FIG. 3, depending on the radius of action of the pulleys. For this reason, the recess 2
The convex portion 21 that fits into the convex portion 2 is also slightly inclined with respect to the concave portion 22. However, in order to allow the inclination of the convex part 21, the concave part 22 has an inner diameter larger than the outer diameter of the convex part 21, or has a shape with a relief that allows the inclination of the convex part 21. Therefore, there is no problem even if the blocks 3 are tilted in the front-rear direction when passing over the pulleys.

Note that the number of the convex portions 21 and the recessed portions 22 is not limited to two each, but in short, the number of the convex portions 21 and the concave portions 22 is not limited to two, but in short, one is provided so that they are symmetrical when viewed from the front direction of the block 3.
It is sufficient if there are more than one. Furthermore, the tip of the convex portion 21 and the concave portion 22 may have a shape other than a hemisphere.

Furthermore, the above embodiment is extremely effective in preventing wear and elongation of the innermost band 2a for the reasons described below.

In a conventional V-belt block, for example, as shown in FIG.
The operating radius R1 of the block 3' and the operating radius R2 of the block 3' were 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 ω is constant on the pulley, the laminated band 2 and block 3' rotate together without relative slipping when passing through the pulley, but at this time, the circumferential velocity V of the outermost block is smaller. It gets faster.

Therefore, when traveling between the pulleys, the laminated band 2 and the block 3' slide 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 band 2a become significant.

However, according to the V-belt block 3 of the first embodiment described above (the one in FIG. 1), the height of the band support surface 16 is adjusted to the longitudinal center C of the inclined surface 18° 19 in contact with the pulley. Since the radius of action of block 3 is
The operating radii of the band support surfaces 16 are both R and coincide with each other.

Therefore, relative slippage between the innermost band 2a and the block 3 due to the difference in radius of action when passing through the pulleys is almost eliminated, and elongation and wear of the innermost band can be significantly reduced compared to conventional V-belts. .

[Embodiment 2] The laminated band used in the V-belt 1 shown in FIG. 4 is divided into a first band group 2 and a second band group 2' located outside this band group 2. ing.

The first band group 2 includes a plurality of metal bands 2a.

2b...2n are stacked in the thickness direction. The second band group 2' also includes a plurality of metal bands 2a'.

2b'...20' are stacked in the thickness direction.

The block 3 consists of a block body 10, a support member 11 provided on the block body 10, and a transverse member 15 which is stretched between necks 13 and 14 of the block body 10. The block body 10, the support part 11, and the horizontal member 15 are made of metal, FRP, ceramic, cermet, etc.
It has a rigidity that does not substantially deform even when a load is applied. Approximately V-shaped inclined surfaces 18 and 19 are provided on both sides of the block body 10 in the width direction, and are in contact with the inner surface of the pulley.

The block body 10 also has a recess 30 located inside the support member 11 and opening in the thickness direction of the block body 10.
is formed. On both sides of this recess 30, neck portions 13 are provided.
．． Step portions 31 and 32 are formed between the step portions 14 and 14. The support member 11 is attached to the stepped portions 31, 32 by appropriate holding means.

A first band support surface 35 that is in contact with the first band group 2 is formed at the bottom of the recess 30 .

Further, on the outer surface of the support member 11, a second band group 2' is provided.
A second band support surface 37 is formed in contact with the second band support surface 37 .

The block body 10 is provided with a convex portion 21 and a concave portion 22 (paths shown) similar to those described in the first embodiment. As in the case of the first embodiment, the tips of the convex portions 21 come into contact with the inner walls of the concave portions 22 of the adjacent blocks, thereby pushing the adjacent blocks 3 together and transmitting the load.

According to the second embodiment, the first band group 2 located inside is in contact with the first band support surface 35, and the second band group 2' is in contact with the second band support surface 37. That is, the laminated band is divided into two band groups 2.degree. 2', each supported by the block 3.

Therefore, compared to conventional products that have only one band in contact with the block (for example, the one in Figure 6), the number of bands in contact with the block has increased even if the tension of the belt as a whole is constant. By dividing the band, the load shared by each band that comes into contact with the block decreases. That is, if the tension sharing is equal, the innermost band 2a in contact with the block 3;
The surface pressure of band 2a' is half of the conventional one, and the innermost band 2a
.

The wear and elongation of 2a' are significantly reduced compared to conventional products.

〔Effect of the invention〕

According to the present invention, the tips of the protrusions provided on the blocks touch the inner walls of the recesses of the adjacent block, and load is transmitted between the blocks via the protrusions and recesses, so that the opposing surfaces of the blocks are Compared to conventional products that have face-to-face contact, the contact parts of the blocks become more familiar with each other, especially at the beginning of the belt's use.

[Brief explanation of the drawing]

Fig. 1 is a front view of a V-belt block showing the first embodiment of the present invention, Fig. 2 is a side view partially showing the block shown in Fig. 1 in cross section, and Fig. 3 is a tilted block. Fig. 4 is a front view of a V-belt gear showing the second embodiment of the present invention, Fig. 5 is a schematic side view of a transmission device using a V-belt, and Fig. 6 is a conventional one. It is a front view showing an example of the block for V belts of. 1... V-belt for power transmission, 2, 2'... Laminated band,
3... V-belt block, 10... Pro-tsuku body, 16... Band support surface, 18.19... Inclined surface, 21... Convex part, 22... Concave part. Applicant's Representative Patent Attorney Takehiko Suzue Figure 1 Figure 2 Figure 3 Figure 4 C Figure 5 Figure 6

Claims (3)

[Claims] (1) In a power transmission belt consisting of an endless laminated band and a large number of blocks stacked in the length direction of the laminated band, a convex portion is provided on one surface in the thickness direction of the block, and the other side is provided with a convex portion. A recess is provided on the surface of the block that fits with the protrusion provided on the adjacent block, and the recess is provided at a distance l_1 from the frontmost part of the surface where the protrusion is provided to the tip of the protrusion. The distance from the rear end of the surface to the rear end of the recess is longer than l_2, and the recess has a shape that allows the convex part to tilt in the front-rear direction when the block runs on the pulley. Alternatively, a power transmission belt characterized in that the inner diameter of the concave portion is larger than the outer diameter of the convex portion. (2) The block has 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 pulley, and the height of the band support surface is set as above. The power transmission belt according to claim 1, wherein the power transmission belt is located at the longitudinal center of the inclined surface. (3) The block includes a block body having a pair of left and right inclined surfaces that come into contact with the pulley, and a support member attached to the block body, and the block body includes a block body having a support member attached to the block body. the first band in contact with the first band group;
A band support surface is formed on the support member, and a second band support surface that is in contact with a second band group located outside the first band group is formed on the support member. The power transmission belt according to item 1.