JPS5881252A - V-belt for transmission - Google Patents

Abstract

PURPOSE:To prevent drop of the transmission efficiency of a transmission arrangement with V-belt, in which an adjacent block swings round its fulcrum line while passing a curvature, by providing projections and recesses on this fulcrum line so that adjoining blocks are fitted with each other. CONSTITUTION:A V-type transmission belt, in operation while loaded over a drive pulley and a follower pulley, is formed by installing a number of blocks 11 at an endless layered band. Each of the blocks 11 has slope 11a on its both sides for contact with pulley and a groove 11b for engagement with said endless band 4, and at its front and back surfaces are formed vertically stretching parallel surfaces 11C, 11C' and inclined surfaces 11d, 11d' stretching aslant in such a way that the thickness decreases gradually while proceeding downward. A projection 11f and a recess 11g both in the form of a semicircular column are formed on the fulcrum line 11e, 11e' for swinging as the intersection line of abovementioned surfaces 11c, 11c' and 11d, 11d', in which a recess 11g and projection 11f of a block 11 adjoining each other shall be fittable with each other.

Description

[Detailed description of the invention] The present invention relates to a power transmission V-belt.

Examples of conventional power transmission V-belts include those shown in FIGS. 1 to 4. As shown in FIG. 1, a power transmission V-belt 3 is used by being wrapped around a driving pulley 1 and a driven pulley 2.
consists of a layered band 4 and a number of blocks 5 assembled to the layered band 4. Block 5 is the second
It has a shape as shown in Figure 3, and has slopes 5a on both sides that contact the pulleys and grooves 5b for engaging with the layered band 4, and alignment grooves on the front and rear surfaces, respectively. It has a projection 5C and a hole 5d. The front surface of the block 5 (the left side in FIG. 3) consists of a perpendicular surface 5e and a surface 5f inclined with respect to the vertical surface 5e, and both surfaces intersect at a line 5g (note that the block 5 Since it swings as a fulcrum, the line 5g will hereinafter be referred to as a "swinging fulcrum line 5gJ".

However, in the conventional power transmission V-belt as described above, the protrusions 5C and 5d for mutual positioning are located above the swing fulcrum line 5g in Figures 2 and 3 (after assembly, the outer circumference of the transmission V-belt side), when the transmission V-belt wraps around the pulley and becomes curved, the block 5 swings about the swing fulcrum line 5g and the protrusion 5c and hole 5d disengage. There was a problem that the positions of the front and rear blocks 5 were shifted.0 There was no positioning action for the front and rear blocks 5. 4: Then, as shown in FIG. It wraps around the pulley in a state that protrudes to the side (the amount of protrusion is referred to as T1.T).
2. The slope 5a indicated by T3 and T4 did not contact the pulleys 1 and 2, and the coefficient of friction became small, resulting in a decrease in transmission efficiency.

The present invention has been made by focusing on the above-mentioned problems in conventional power transmission V-belts, and solves the above-mentioned problems by providing mutual positioning protrusions and holes on the swing fulcrum line of the block. The purpose is to

Hereinafter, the present invention will be described in figures 5 to 11 of the attached drawings showing embodiments thereof.
This will be explained based on the diagram.

First, the configuration will be explained.

5 and 6 show a block 11 of a transmission bell 10 according to the present invention. The block 11 has on both sides slopes 11a that contact the pulleys and grooves 11b for assembling to the layered band 4.

In addition, the front and rear surfaces of the block 11 (the left side is the front surface and the right side is the rear surface in FIG. 6)'1l18i are both vertical parallel surfaces 11c and 1
1c' and an inclined surface li which is inclined so that the thickness becomes smaller.
Swing fulcrum lines lie and lie', which are lines d and 11d' and intersect on one surface, are at symmetrical positions in the front and rear planes. The front and rear surfaces of the block 11 are provided with a semi-cylindrical protrusion 11f and a semi-cylindrical space 11g, respectively, and the center lines of the semi-cylindrical protrusions 11f and recess 11g are the swing fulcrum lines lie and lie'', respectively. It matches.Protrusion 11
The curvature R1 of the semi-cylinder of f is the curvature R2 of the semi-cylinder of the recess 11g.
The length of the protrusion 1if in the width direction is slightly smaller than the length of the recess 11e in the width direction, so that play is provided between the two. As shown in FIG. 7, a power transmission V-belt lo is constructed by assembling a large number of such blocks 11 to a layered band 4.

Next, the effect will be explained.

As shown in FIG. 7, the transmission V-belt lO
and is wrapped around the driven pulley 2 to transmit power between the driving pulley l and the driven pulley 2. At this time, the portion where the transmission V belt lo is straight (not wrapped around the driving pulley l and the driven pulley 2) part), as shown in Figure 18.

The protrusions 11f and recesses 11g of each block 11 fit into each other, and the parallel surfaces lie and llc' are in contact with each other, and each block 11 moves in a straight line in this aligned state. In the part where the transmission V-belt lO forms a curve (the part where it wraps around the driving pulley l and the driven pulley 2), each block 11 uses the swinging fulcrum lines lie and 11e' as fulcrums, as shown in FIG. It swings according to the radius of curvature of the transmission V-belt. In this case, the center line of the protrusion 11f and the recess 11g is the swing fulcrum line li.
e and 11e', the fit between the protrusion 11f and the recess 11g will not come loose, and no deviation will occur between the front and rear blocks 11 in the outer circumferential direction. As soon as the slope 11a wraps around the pulleys l and 2, the transmission efficiency does not decrease.
Since the length in the width direction of 1g is slightly smaller than the length in the width direction and a slight play is given in the width direction, even if the protrusions 11f and the recesses 11g are uneven in the width direction due to manufacturing errors of the block 11, they will not contact the pulley. When subjected to force, it aligns reliably in the width direction. Furthermore, since the cylindrical projection 11f and the cylindrical recess IIg fit into each other, twisting does not occur between the front and rear blocks 11.

A second embodiment of the present invention is shown in FIGS. 10 and 11. In this embodiment, a semi-cylindrical protrusion 21a and a recess 21b are provided over the entire width of the block 21. The other configurations are similar to the first embodiment. It is clear that this embodiment also provides the same functions and effects as the first embodiment.

As explained above, according to one aspect of the present invention, the protrusions and four parts that are always fitted into adjacent blocks are provided on the swing fulcrum line on the front and rear surfaces of each block, so that the blocks are always aligned. Sufficient frictional force is obtained immediately after the block starts contacting the pulley, and the desired transmission efficiency can be obtained. Further, by providing play in the width direction between the protrusion □ and the recess, manufacturing errors in the block can be absorbed. In addition, by making the protrusions and recesses semi-cylindrical, screws between the blocks can be easily tightened.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing a conventional transmission V-belt, Fig. 2 is a front view of a block of the conventional transmission V-belt, Fig. 3 is a side view of the flock of the transmission V-belt shown in Fig. 2, and Fig. 4 is a diagram showing a conventional transmission V-belt. FIG. 5 is a front view of the block according to the present invention, FIG. 6 is a side view of the block of the transmission V-belt shown in FIG. 5, and FIG. FIG. 8 is a diagram showing the transmission V-belt according to the invention - a straight section, FIG. 9 is a diagram showing the curved section of the transmission V-belt according to the invention, and FIG. FIG. 11 is a front view of a block which is a $2 embodiment of the present invention.
FIG. 2 is a side view of a block of the power transmission V-belt shown in FIG. 10... Transmission V-belt, 11... Block, 11a
***Slope, 1lb --- Groove, llc, 11c'Φ・
・Parallel surface, lld, 11 d,”・O・Slanted surface, lie
, lie”...Swing fulcrum line, 1if・φψ protrusion, l1
g---1! ! Part 7, 21...Flock, 21a...
Φ protrusion, 21b, Φ, recess. Patent Applicant Nissan Motor Co., Ltd. Agent Patent Attorney Toshiyuki Miyauchi Figure 2 Figure 3 5C Figure 4 Figure 5 Figure 6 -

Claims (1)

[Claims] 1. A transmission V-belt consisting of a layered band and a large number of blocks assembled to the layered band, in which the adjacent blocks in the curved portion of the transmission V-belt move along their swing fulcrum line. A transmission V-belt that swings relative to each other as a fulcrum, characterized in that protrusions and recesses are provided on the swinging fulcrum line on the front and rear surfaces of each block so that adjacent blocks are always fitted into each other. 2. When the protrusion and the recess are fitted into each other, the transmission V
Claim 1 in which the belt has play in the width direction
The transmission V-belt 3 according to claim 1 or 2, wherein the protrusion is semi-cylindrical, and the recess is a semi-cylindrical recess corresponding to the protrusion. 4. The transmission V-belt according to claim 3, in which the protrusions and recesses are provided over the entire width of the block.The front and rear surfaces of the block are respectively parallel to the outer peripheral side of the transmission V-belt, and the thickness thereof is reduced. Transmission and motion V tilted to
The transmission V according to any one of claims 1 to 4, wherein the belt is formed of an inclined surface on the inner peripheral side of the belt, and the swing fulcrum line is a line of intersection between the parallel surface and the inclined surface. belt.