JPH0914357A - Block for transmission belt - Google Patents

Abstract

PURPOSE: To reduce manufacturing cost by providing a pair of recessed parts at a position corresponding to a projection on a back surface and fitting projections of following blocks in these recessed parts. CONSTITUTION: A projection 10 is provided on a taper starting line of a tapered surface 6 formed on a front surface lower part of a block 1, and a recessed part 13 is formed on a back surface of the projection 10. A large number of blocks 1A, 1B...1E are laminated and a transmission belt 15 connected by an endless metallic belt 11 is wound around a pulley of a radius R. In a region right of a point P, upper half parts of the blocks 1A, 1B make contact with each other, and the lower part tapered part 6 is in a non-contact state. As the projection 10 is formed on the taper starting line, there is nothing to worry about the projection 10 to be removed from the frontward recessed part 13. In a region left of the point P, as the blocks 1C, 1D, 1E move along a pitch circle, upper half parts of the blocks 1C, 1D, 1E are separated and lower half parts make contact with each other, and accordingly, there is nothing to worry about the projection 10 to be removed from the frontward recessed part 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission belt block suitable for an endless metal belt of a belt type transmission.

[0002]

2. Description of the Related Art No. 10 of Japanese Utility Model Laid-Open No. 61-97646
FIG. 1B shows a plurality of block pieces 2 (... indicates a plurality of pieces. The same applies hereinafter), and a metal band 1 fitted in the left and right grooves of these block pieces 2. , 1 is disclosed. This transmission belt is wound between the pulley 5 and the pulley 6 as shown in FIG. 10 (A), but the portion L in the drawing is the portion not hooked on the pulleys 5 and 6. This L
Since the block pieces 2 ... Float in the air at the location, there is a risk of swinging to the left and right as shown in FIG. 10 (C). When the block pieces 2 ... Swing to the left and right, noise is generated and the block pieces 2 ... wear, which is not preferable.

Therefore, a technique for stopping the swing of the block piece has been researched conventionally, and for example, Japanese Patent Laid-Open No. 1-1359.
Japanese Unexamined Patent Publication No. 4-4 (Japanese Patent Laid-Open No. 4-4)
Japanese Patent No. 344, "High Load Transmission Belt" has been proposed.

In the above, as shown in FIG. 3 of the publication, a protrusion 17 is provided on the upper front surface of the block 10 and a recess 18 is provided on the upper rear surface thereof, and the block 10 is provided as shown in FIG.
Of the lower front surface of the step portion 21, 21 and the lower rear surface of the engaging portion 22,
22 is provided. The protrusion 17 is the recess 1
8 and the step portions 21 and 21 are engaged with the engaging portion 22,
Since the blocks 10 are engaged with each other, the blocks 10 can be connected to each other, and the shaking of the blocks 10 ... Can be suppressed.

As shown in FIG. 2 of the publication, the above is provided with a projection 40a on the upper front surface, a recess 50a on the upper back surface, a lower projection 41a and a notch 42a on the lower portion, and a projection 40a on the upper recess 50a. And the lower protrusion 41a is engaged with the notch 42a to connect the blocks to each other.

[0006]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
21 and the engaging portions 22 and 22 require a large amount of processing and must be precisely finished, which increases the manufacturing cost.

The above is the protrusion 40a on the upper front surface, the recess 50a on the upper rear surface, the lower protrusion 41a and the notch 42a on the lower portion.
However, as is clear from the figure, these projections 40a, recesses 50a, lower projections 41a and notches 42a are formed on the edges of the block, and it is not possible to perform this type of processing by pressing. There is a problem with the ring, which requires extremely high technology, which increases the manufacturing cost. That is, in both of the above, the block is manufactured by cutting out from a thick material or by press working, but in the case of cutting out, the yield is poor due to the large cutting allowance, and in the case of press working it is of good quality. Therefore, the manufacturing cost is increased as described above.

[0008]

While continuing the trial development of a block for a transmission belt, the inventors of the present invention did not make the block into a complicated shape as described above, but swing it with a simpler structure. Based on the finding that motion could be suppressed, we have made various prototypes of blocks with simple shapes, and as a result of operating them, we have found that the objects can be sufficiently achieved with very simple shapes. The specific shape is as follows.

In the transmission belt block according to the first aspect of the present invention, the lower part of the front surface is a side taper surface, and a pair of protrusions are provided on the taper start line of the taper surface and at positions symmetrical to each other with respect to the center line of the block. However, it is characterized in that a pair of recesses are provided at positions corresponding to the protrusions on the back surface, and the protrusions of the next block can be fitted into these recesses.

In the present invention, the taper start line is
It is characterized in that it is formed on the pitch circle of the pulley.

[0011]

In the block of claim 1, the projections on the front surface of the block are fitted in the recesses on the back surface of the front block, and the projections on the front surface of the rear block are fitted in the recesses on the back surface of the block. To connect. Since the protrusion is formed on the taper start line, there is no concern that it will come off from the previous block even when the transmission belt winds around the pulley.

In the block according to the second aspect, since the taper start line is matched with the pitch circle of the pulley, the engagement between the protrusion and the recess is always deep, and the blocks are connected more reliably.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a front view of a transmission belt block according to the present invention, in which a transmission belt block 1 (hereinafter abbreviated as “block 1”) has side taper surfaces 2a, 2 left and right.
a substantially trapezoidal block main body 2 having a, a head 4 protruding from the block main body 2 through a neck portion 3, and a metal band storage groove formed between the head 4 and the block main body 2. 5 and 5, a tapered surface 6 is formed on the lower front surface of the block 1, and protrusions 10 and 10 are provided on the taper start line 7 of the tapered surface 6 at positions separated from the center CL in the width direction of the block. It is a thing. The metal band housing grooves 5, 5 are U-shaped grooves for housing the endless metal bands 11, 11.

FIG. 2 is a sectional view taken along the line 2-2 of FIG. 1. The left side of the figure is the front side and the right side is the back side. The tapered surface 6 and the protrusion 10 are formed on the lower front side, and the recess 13 is formed on the back side. Indicates that it has been done. The recess 13 accommodates the projection of the next block (not shown), but is substantially the same shape as the projection 10 on the front surface.

FIG. 3 is a perspective view of a block according to the present invention. The block body 2 of the block 1, the neck portion 3, the head 4, the metal strip housing grooves 5 and 5, the taper surface 6, the taper start line 7 and the projections. The positional relationship of 10 and 10 is shown. The recesses 13 and 13 are not visible because they are located on the back surface, but the protrusion 1
It is provided at a position corresponding to 0 and 10. The taper angles of the left and right side taper surfaces 2a, 2a of the block body 2 are defined by the taper angle of the belt receiving surface of the pulley.
Further, the taper surface 6 at the lower part of the front surface is defined by the relationship between the pitch circle of the pulley and the thickness of the block 1.

The operation of the block having the above configuration will be described. FIG. 4 is an explanatory view of the operation of the power transmission belt according to the present invention. A large number of blocks 1A, 1B ... 1E (the blocks are the same as the block 1, but for convenience of explanation, A to E are added. .) Is laminated and connected by endless metal strips 11 and 11 (one is not shown because it is at the back), and the transmission belt 15 is wound around a pulley having a radius R. Only a part of the blocks 1 ... Is shown. In the figure, the belt from the points P and P on the left is the belt, and the area from the point P to the right is the area where the belt is not on the pulley. In the area to the right of the point P, the upper half portions of the blocks 1A and 1B of the block 1A and the block 1B are in contact with each other, and the lower tapered portions 6 and 6 are in a non-contact state. Since the protrusion 10 on the front surface of the block is formed on the taper start line, there is no concern that the protrusion 10 will come off from the front concave portion 13.

In the area to the left of points P and P, block 1
As C, 1D, 1E move along the pitch circle, the upper half portions of the blocks 1C, 1D, 1E separate and the lower half portions of the blocks abut each other. Also at this time, since the projection 10 on the front surface of the block is formed on the taper start line, there is no concern that the projection 10 will come off from the front concave portion 13. That is,
In the present invention, since the protrusion 10 is provided on the taper start line 7, the engagement with the concave portion 13 can be ensured regardless of the area on either side of the point P. For this reason, it is not necessary to increase the height of the protrusion 10 so much, and the recess 13 can be made shallow at the same time. Therefore, the process of forming the protrusion 10 and the recess 13 in the block 1 can be easily performed.

Further, in FIG. 1, a pair of protrusions 10, 1
0 is formed at a position L, L away from the center CL in the width direction of the block, but these are endless metal strips 11, 11
It is possible to effectively generate a moment that opposes the swinging moment at a position where the force from is easily received. Also, although there is no problem when the two endless metal strips 11 and 11 uniformly act on the block 1, there is a risk that bending will act on the neck portion 3 in which the actions of both are uneven and a large stress is generated. There is. However, in this embodiment, the endless metal strip 1
Since the projections 10 and 10 are provided in the vicinity of the projections 1 and 11 and these are surely fitted into the recesses 13 and 13 of the front block, the swinging moment of the endless metal strip 11 is well endured, and as a result, It is possible to reduce the stress generated in the neck portion. Therefore, although the protrusions 10 and 10 are on the taper start line 7, the swing of the block 1 can be effectively suppressed.

As is clear from FIG. 4, it is desirable that the taper start line 7 be on the pulley pitch circle.

However, if the pulley is a variable width pulley used in a continuously variable transmission, the pitch circle cannot be uniquely determined. Therefore, in the variable width pulley, an average diameter between the maximum diameter and the minimum diameter is used as a pitch circle, or a frequently used diameter is used as a pitch circle. In this case, the taper start line 7 deviates from the pitch circle during use, but since the deviating distance is small, there is no concern that the protrusion 10 will come off the recess 13. It suffices to adjust the height of the protrusion 10 according to the distance of the deviation. Specifically, if the distance is large, the height of the protrusion 10 is increased.

The block 1 has a protrusion 10 and a recess 13.
Because of the small size, when manufactured by cutting, the cutting allowance is small, the yield is good, the processing time is short, and the processing cost can be saved. Further, in the case of manufacturing by press working, since the drawing amount is small, the mold becomes simple and the cost of the mold becomes low.

[0022]

The present invention has the following effects due to the above configuration. According to another aspect of the transmission belt block of the present invention, a lower portion of the front surface is a tapered surface, and a pair of protrusions are provided on a taper start line of the tapered surface and at positions symmetrical to each other with respect to a center line of the block, and a rear surface of the block. It has a pair of recesses at positions corresponding to the projections, and projections of the next block can be fitted into these recesses, and the projections on the front surface of the block are fitted to the recesses on the back surface of the previous block. The blocks are connected to each other by fitting the projections on the front surface of the subsequent block into the recesses on the back surface of the block. Since the protrusion is formed on the taper start line, there is no concern that it will come off from the previous block even when the transmission belt winds around the pulley. Further, since the projections and recesses are provided on the taper start line, the projections and recesses can be small, and when manufactured by shaving, the cutting allowance is small, the yield is good, the processing time is short, and the processing cost can be saved. Further, in the case of manufacturing by press working, since the drawing amount is small, the mold becomes simple and the cost of the mold becomes low.

In the block of claim 2, since the taper start line is matched with the pitch circle of the pulley, the engagement between the protrusion and the recess is always deep, and the blocks are connected more reliably.

[Brief description of the drawings]

FIG. 1 is a front view of a transmission belt block according to the present invention.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is a perspective view of a block according to the present invention.

FIG. 4 is an explanatory view of the operation of the transmission belt according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Block for transmission belt (block), 2 ... Block main body, 2a ... Side taper surface, 3 ... Neck part, 4 ... Head part, 5 ... Metal band storage groove, 6 ... Tapered surface, 7 ... Taper start line, 10 ... protrusions, 11 ... endless metal bands, 13 ... recesses,
15 ... Transmission belt, CL ... Center of block width direction, R
... radius of pitch circle, T ... block thickness, d ... recess depth, h ... projection height.

Front Page Continuation (72) Inventor Minoru Wada 1-10-1 Shin-Sayama, Sayama City, Saitama Prefecture Honda Engineering Co., Ltd.

Claims (2)

[Claims] 1. A transmission belt block having a pair of left and right side taper surfaces that come into contact with a pulley, and is used by stacking a plurality of endless metal strips in the longitudinal direction, the block being a lower portion of the front surface. Is a tapered surface, has a pair of projections on the taper start line of the tapered surface and at positions symmetrical to each other with respect to the center line of the block, and has a pair of recesses on the back surface at positions corresponding to the projections. , A block for a transmission belt, wherein projections of the next block can be fitted into these recesses. 2. The block for a power transmission belt according to claim 1, wherein the taper start line is formed on a pitch circle of a pulley.