JP2003074642A - High load transmitting v-belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the peak of a noise level generated by contact of each block with a pulley, in a high load transmitting V-belt B comprising tension bands 1 comprising an endless flat belt and many blocks having fitting portions 8 in which the tension bands 1 are fitted, wherein a contact portion at a side of each block is abutted against a belt groove surface V of the pulley. SOLUTION: The blocks are two types of blocks 6 and 7 of different areas of the side contact portions 6a and 7a and different shapes. The blocks 6 and 7 are engaged with the tension bands 1, in an alternate arrangement in a belt length direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high load transmission V-belt, and more particularly to noise reduction measures.

[0002]

2. Description of the Related Art Conventionally, for example, Japanese Patent Laid-Open No. 2000-120.
As shown in Japanese Patent Publication No. 798, etc., a high load transmission V-belt in which a large number of blocks are locked and fixed to a tension band by utilizing the uneven meshing structure of the blocks and the tension band is well known,
For example, it is used in the field of continuously variable transmissions. This kind of V
In the belt, in order to ensure the bending resistance, each block is fixed to the tension band not by adhesion but by physical engagement. This belt is provided with, for example, a pair of left and right tension bands arranged in the belt width direction, and upper and lower recesses as a number of meshed parts arranged in the belt length direction are vertically arranged on the upper and lower surfaces of each tension band. It is provided corresponding to. On the other hand, a pair of cutout groove-shaped left and right fitting portions for fitting the respective tension bands is formed on the belt width direction side portion of each block, and the upper surface of each fitting portion serves as an upper meshing portion. The upper convex portion is provided, and the lower convex portion as a lower meshing portion is provided on the lower surface. Then, the tension bands are press-fitted and fitted into the left and right fitting portions of the blocks, whereby the blocks are engaged and fixed to the tension bands.

[0003]

However, in the above-mentioned prior art, since each block is made of a highly elastic material or the like, when the V belt enters the pulley at a high speed, the block causes the belt groove surface of the pulley to move. There was a problem in that a very loud hitting sound (hereinafter, referred to as belt running noise) was generated by contact with the. That is, the frequency of the belt running noise is closely related to the number of frames of the block, and the frequency (block order) generated in the cycle in which the block contacts the pulley almost determines the noise level of the belt. And V
If all the blocks in one belt have the same shape, the noise level and frequency generated when each block comes into contact with the pulley become exactly the same, and a large noise level peak appears at the frequency obtained from the block order. Occurs.

The present invention has been made in view of the above points, and an object thereof is to improve a block of a V belt for high load transmission, which occurs when each block comes into contact with a pulley. The noise level and the frequency are changed to suppress the peak of the noise level of the frequency obtained from the block order.

[0005]

In order to achieve the above object, in the present invention, the block in the high load transmission V-belt is made of at least two types having different shapes.

[0006] Specifically, in the invention of claim 1, in the tension band composed of an endless flat belt, the tension band is fitted in the tension band at the fitting portion in the length direction of the tension band. A high load transmission V-belt having a plurality of engaged blocks, wherein at least the side surface of each block is in contact with the belt groove surface of the pulley, the block is composed of at least two types having different shapes; To do.

According to the above construction, since the blocks are made of at least two types having different shapes, it is possible to change the noise level and frequency generated when each block comes into contact with the pulley. As a result, resonance at the frequency obtained from the block order of the block is suppressed, and the peak of the noise level can be suppressed. Therefore, the running noise of the V-belt can be reduced.

According to the second aspect of the present invention, the block is composed of at least two types having different side surface areas.

According to the above structure, the noise level and frequency generated when each block comes into contact with the pulley can be easily changed only by changing the area of the side surface of the block, and the running noise of the V-belt is increased. Can be reduced.

According to the third aspect of the invention, a plurality of types of blocks are randomly arranged in the belt length direction. In the invention of claim 4, a plurality of types of blocks are arranged repeatedly in order in the belt length direction.

According to these configurations, the noise level and frequency generated when each block comes into contact with the pulley can be changed more effectively, and the peak of the noise level of the frequency obtained from the block order can be suppressed. Is possible. Therefore, the running noise of the V-belt can be reduced more effectively.

In the invention of claim 5, there are two types of blocks. According to the above configuration, since the blocks are limited to two types, the V-belt can be easily manufactured.

According to the sixth aspect of the invention, the tension band is a pair. This results in a desirable V-belt that reduces running noise.

[0014]

1 shows a high load transmission V-belt B according to an embodiment of the present invention. The V-belt B has a pair of left and right endless tension bands 1 and 1 and the tension band 1. , 1
Blocks 6, 6, ..., 7, 7 continuously engaged and fixed to
It consists of ... and.

Then, as shown in FIG. 2, each tension band 1
Is a shape-retaining layer 1a made of hard rubber, in which a plurality of high-strength and high-elasticity core wires 1b, 1b, ... Made of aramid fiber or the like are spirally arranged and embedded. On the upper surface of the groove-like upper concave portions 2, 2, ...
On the lower surface, lower recesses 3, 3, ... With a constant pitch extending in the belt width direction are formed corresponding to the upper recesses 2, 2 ,. Further, canvas cloths 4 and 4 are adhered to the upper and lower surfaces of the tension band 1 for the purpose of improving its wear resistance.

The hard rubber forming the shape-retaining layer 1a is
For example, a hard rubber excellent in heat resistance and hard to be permanently deformed can be obtained by further strengthening H-NBR rubber reinforced with zinc methacrylate with short fibers such as aramid fiber and nylon fiber. The hardness of this hard rubber requires a rubber hardness of 75 ° or more when measured with a JIS-C hardness meter.

Further, as shown in FIGS. 3 and 4, each of the blocks 6 and 7 is made of a highly elastic hard resin material or the like, and its left and right side surfaces are in contact with the belt groove surface V of the pulley P. , 7a, and the belt angle formed by the left and right contact portions 6a, 6a, 7a, 7a of the blocks 6, 7 is the same as the angle formed by the belt groove surface V.

Further, the contact portions 6a, 7 of each block 6, 7
Notch groove-shaped fitting portions 8, 8 into which the respective tension bands 1 are detachably fitted from the width direction are formed in the substantially central portion in the upper and lower portions of a, that is, the left and right side portions in the belt width direction. That is, each of the blocks 6 and 7 has upper and lower beams 6b and 7b extending in the belt width direction (horizontal direction), lower beams 6c and 7c, and left and right central portions of the both beams 6b, 6c, 7b and 7c which are vertically arranged. The pillars 6d and 7d connected to each other are formed into a substantially H shape, and a fitting portion 8 is formed in a portion surrounded by the pillars 6d and 7d. By pressing and fitting the bands 1 and 1, the block 6
6, ..., 7, 7 ... Are continuously fixed to the tension bands 1, 1.

Specifically, as shown in FIG. 2, on the upper wall surface of each fitting portion 8 in each of the blocks 6 and 7, an upper side formed by a ridge that meshes with each upper concave portion 2 on the upper surface of the tension band 1 is formed. The convex portions 9 are formed on the lower wall surface of the fitting portion 8, and the lower convex portions 10 formed of convex ribs that mesh with the lower concave portions 3 on the lower surface of the tension band 1 are arranged in parallel with each other. By engaging the upper and lower convex portions 9 and 10 of the blocks 6 and 7 with the upper and lower concave portions 2 and 3 of the tension band 1, respectively, the blocks 6, 6, ... Is fixed by press-fitting in the belt longitudinal direction, and in this engaged state, the outer side surface of each tension band 1 and the upper and lower projections 9 and 10 of each block 6 and the upper and lower recesses 2 and 3 of each tension band 1. Power is transmitted and received by meshing with the.

Further, inside the blocks 6 and 7, reinforcing members 11 and 12 made of a lightweight aluminum alloy or the like are embedded so as to be located substantially at the centers of the blocks 6 and 7.
Then, for example, in the upper and lower convex portions 9 and 10 and the contact portions 6a, 6a, 7a and 7a on the left and right side surfaces, which are the meshing portions with the tension band 1, they are embedded in the hard resin and appear on the surface of each block 6, 7. Absent. However, since the other portions do not come into contact with the belt groove surface V of the pulley P, the tension band 1, or the like, they may be exposed on the surface of each block 6, 7.

As shown in FIGS. 3 and 4, as a feature of the present invention, each of the blocks 6 and 7 is composed of two types of blocks, a first block 6 and a second block 7 having different shapes. The two types of blocks 6 and 7 are alternately arranged in the belt length direction.

That is, the above two types of blocks 6, 7
Has a shape in which the vertical heights of the contact portions 6a, 7a on the left and right side surfaces that contact the belt groove surface V of the pulley P are different. Specifically, the left and right end portions of the upper surface of the upper beam portion 6a of the first block 6 are gently inclined toward the lower side toward the side surface, while the second block 7 is inclined.
The same inclination angle β1 is larger than the inclination angle α1 of the first block 6 (α1 <β1). Similarly, the left and right end portions of the lower surface of the lower beam portion 6b of the first block 6 are gently inclined at an inclination angle α2 toward the upper side toward the side surface, but the inclination angle β2 of the second block 7 is , Larger than the inclination angle α2 of the first block 6 (α2
<Β2). As a result, the areas of the blocks 6 and 7 in contact with the belt groove surface V of the pulley P are different from each other, and the contact area of the first block 6 is larger than that of the second block 7. In addition, the inclination angles of the upper and lower surfaces of the reinforcing members 11 and 12 are also different.

Therefore, in the above embodiment, the blocks 6 and 7 are made of two types having different contact areas with the belt groove surface V of the pulley P as described above. Since 7 are arranged alternately in the belt length direction, it is possible to change the noise level and frequency generated when each block 6, 7 comes into contact with the pulley P. As a result, the resonance at the frequency obtained from the block order of each of the blocks 6 and 7 is suppressed, and the peak of the noise level can be suppressed. Therefore, the running noise of the V-belt can be reduced.

Each of the blocks 6 and 7 is composed of at least two types having different side surface areas, and only by changing the side surface area of each block 6, 7, each block 6, 7 can be changed.
The noise level and frequency generated when 7 comes into contact with the belt groove surface V of the pulley P can be easily changed,
It becomes possible to suppress the peak of the noise level.

Further, since each of the blocks 6 and 7 is limited to two types, the V-belt can be easily manufactured.

In the above embodiment, the two types of blocks 6 and 7 are arranged alternately in the belt length direction, but these blocks 6 and 7 may be arranged randomly in the length direction, The same effect as that of the above embodiment can be obtained.

In the above embodiment, the blocks 6 and 7 are used.
Although there are two types, the number may be three or more, and the effect of suppressing the peak of the noise level increases. However, it is desirable to use two types in terms of manufacturing cost. When the number of blocks is three or more, the blocks of three or more may be arranged in sequence in the belt length direction in a repeated manner or randomly, and in any case, the same as in the above embodiment. The effect is obtained.

Further, in the above embodiment, the two types of blocks 6 and 7 in which the contact areas 6a and 7a on the side surfaces are different from each other are used, but the blocks in which the shapes of the other portions are different may be used. However, considering that it can be easily realized,
As in the above embodiment, it is desirable that the contact portions 6a, 7a on the side surfaces have different areas.

In the above embodiment, the tension band 1 is a pair, but the present invention is of course applicable to a high load transmission V-belt having one tension band. is there.

[0030]

EXAMPLES Next, concretely implemented examples will be described. As shown in FIG. 5, as an example, a high load transmission V provided with two types of blocks 6, 6, ..., 7, 7 ... In which the areas of the side contact portions 6a, 7a are different from each other as in the above embodiment. As the belt B, and as a comparative example, a high load transmission V-belt B ′ including only one type of the first blocks 6, 6, ... In the embodiment was prepared. Each of the V belts B and B ′ of these examples and comparative examples was provided with a pulley pitch diameter of 130.
It was wound around a drive pulley Pr consisting of a 64 mm V pulley and a similar driven pulley Pn having a pulley pitch diameter of 65.32 mm. The block pitch of each belt B, B'is 3 m.
m. Then, the driven pulley Pn is connected to the drive pulley Pr.
The belt tension is applied by urging a load of 1338 N in a direction away from the drive pulley Pr, and the drive pulley Pr is rotated at a rotational speed of 1 in this state.
The V belts B and B ′ were driven and rotated at 000 rpm to run between the pulleys Pr and Pn, and the noise was measured.
The measurement microphone M is located 15 mm from the belt back surface on the belt exit side of the driven pulley Pn (marked with X in the figure).
Placed in. The result of frequency analysis of this measured value is shown in FIG.

According to FIG. 6, the block order n of the example and the comparative example is n = 130.64 × π / 3 ×
It became 1000/60 = 2280 Hz, and in the comparative example, the peak of the noise level was seen around this frequency.

On the other hand, the noise level at the block order n of the embodiment having two types of block shapes was reduced by about 15% as compared with the conventional example.

That is, the high load transmission V-belt B of the embodiment has two types of blocks 6, 6, ...
7, the noise level and frequency generated when each of the blocks 6 and 7 comes into contact with the pulley can be changed, whereby the frequency at the frequency determined from the block order of the blocks 6 and 7 can be changed. Resonance was suppressed and it became possible to suppress the peak of the noise level. Therefore, it is understood that the running noise of the block type high load transmission V-belt can be effectively reduced.

[0034]

As described above, according to the V-belt for high load transmission of the invention of claim 1, since the blocks are of at least two types having different shapes, the noise level of the frequency determined from the block order can be improved. Suppresses the peak, V
Belt running noise can be reduced.

According to the second aspect of the present invention, the blocks are at least two types having different side surface areas.
It is possible to easily suppress the peak of the noise level of the frequency obtained from the block order.

In the invention of claim 3, a plurality of types of blocks are randomly arranged in the belt length direction. Further, in the invention of claim 4, a plurality of types of blocks are repeatedly arranged in sequence in the belt length direction. According to these inventions, it is possible to more effectively suppress the peak of the noise level at the frequency obtained from the block order.

According to the invention of claim 5, the V-belt can be easily manufactured by using two types of blocks.

According to the sixth aspect of the present invention, the tension band is a pair, so that it is desirable to reduce V in running noise.
The belt is obtained.

[Brief description of drawings]

FIG. 1 is a perspective view of a high load transmission V-belt according to an embodiment of the present invention.

FIG. 2 is a side view of a V-belt for high load transmission.

3 is a sectional view taken along line III-III in FIG.

4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is a diagram schematically showing a noise test device in an example.

FIG. 6 is an operation diagram showing a noise level measurement result.

[Explanation of symbols]

1 tension band 6 First block 7 Second block 6a, 7a side surface 8 Fitting part B High load transmission V belt V belt groove surface

Claims (6)

[Claims] 1. A tension band composed of an endless flat belt, and a plurality of blocks engaged with the tension band in the length direction of the tension band in a state where the tension band is fitted at a fitting portion. ,
A high load transmission V-belt in which at least a side surface of each block is in contact with a belt groove surface of a pulley, wherein the blocks are at least two types having different shapes. 2. The V-belt for high-load transmission according to claim 1, wherein the block is made of at least two types having different side surface areas. 3. The V-belt for high-load transmission according to claim 1, wherein a plurality of types of blocks are randomly arranged in the belt length direction. 4. The V-belt for high-load transmission according to claim 1, wherein a plurality of types of blocks are repeatedly arranged in sequence in the belt length direction. 5. The high load transmission V-belt according to claim 1, wherein there are two types of blocks. 6. The V-belt for high load transmission according to claim 1, wherein the tension belt comprises a pair of tension bands.