JP2954897B2 - V belt for high load transmission - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a belt-type transmission for automobiles, agricultural machines and general-purpose machines, in which a plurality of blocks are locked in a pair of tension bands on both sides in a belt length direction. The present invention relates to a high-load transmission V-belt, and more particularly to an improvement in a cross-sectional shape of an engagement portion between each block and each tension band.

[0002]

2. Description of the Related Art For example, in a high-load transmission V-belt used in a belt-type continuously variable transmission of an automobile, a large number of blocks are arranged in a pair of endless tension bands arranged on both sides in the belt width direction in the belt length direction. It is locked at equal intervals.

The above-mentioned belt will be specifically described with reference to FIG. In the figure, only the right half of the belt is shown, and the left half is omitted. Each of the blocks A is
An upper beam a arranged on the back side of the belt (upper side in the figure) so as to extend in the belt width direction (left-right direction in the figure), and the upper beam a and a belt on the inner side of the belt (lower side in the figure) A lower beam b arranged to extend in the belt width direction corresponding to the vertical direction in the thickness direction (vertical direction in the figure), and a center pillar c for connecting these upper and lower beams a and b to each other at the center in the belt width direction. And a slit-shaped fitting portion d formed by the two beams a and b and the center pillar c on both sides in the belt width direction. When the band B is fitted, the two belts B are locked at equal intervals in the belt length direction.
In addition, e in the figure is a core wire spirally embedded in the tension band B.

In the conventional high-load transmission V-belt, the cross-sectional shapes of the fitting portion d of each block A and the tension bands B at the fitting portion d are the same. That is, in the illustrated example, each of the blocks A has an upper corner f at a right angle in cross section between the upper beam a and the center pillar c at the fitting portion d. On the other hand, the upper corner g corresponding to the upper corner f of each of the tension bands B has the same right-angle cross section as the upper corner f. Also, each block A
A lower corner h having a right-angle cross section is provided between the lower beam b and the center pillar c in the fitting portion d. On the other hand, the lower corner i corresponding to the lower corner h of each of the tension bands B has the same right-angle cross section as the lower corner h.

When the belt is wound around, for example, two speed change pulleys on the driving side and the driven side to transmit the belt, the belt receives a reaction force from the pulley in each block A, and the belt receives the reaction force. The force is transmitted to the tension bands B, B to apply tension to the tension bands B, B.

[0006]

However, in the above-described conventional high-load transmission V-belt, as the tension is applied to each tension band B as described above, each of the tension belts B is applied as shown by a virtual line in FIG. When the tension band B attempts to deform, the deformation may be restricted by each block A. That is, the upper corner g of each tension band B is equal to the upper corner f of each block A.
The lower corner i of each tension band B is regulated by the lower corner h of each block A. In particular, when the belt is wound around the pulley, the deformation on the inner surface side of the belt is greatly restricted by being sandwiched between each block A and the pulley. Then, there is a problem that the deformation of the tension band B is strongly compressed by the deformation and generates heat, and the belt life is easily shortened due to the deterioration of each tension band B due to such heat generation.

When the belt is manufactured, the operation of inserting the tension bands B into the two fitting portions d, d of each block A in the belt width direction is performed.
Since i has a right-angle cross section, as shown in an exaggerated manner in FIG. 15, when the tension band B has the canvas layers j and k on both upper and lower surfaces, each canvas is inserted when the tension band B is inserted. Layer j,
There is also a disadvantage that k is easily caught on each edge of the upper and lower beams a and b and turned up. In other words, when the belt is used in a turned up state, heat generation and early wear of the tension band B are apt to occur in the turned up portion, and there is also a possibility that the life of the belt may be shortened.

Further, with respect to each of the blocks A, when a tension is applied to the tension band B, the stress generated in each of the blocks A tends to concentrate on the apex of the upper corner portion f, thereby causing early destruction of each of the blocks A. This may also be one of the causes of shortening the life of the belt. In order to prepare for such a situation, as shown in FIG. 16, even when the reinforcing material m made of metal or the like is embedded in each block A, the reinforcing material m is formed by the cross-sectional shape of the upper corner f of the block A. Is greatly restricted, and the generated stress is higher than the restriction, so that it is difficult to sufficiently avoid the stress concentration as described above.

The present invention has been made in view of the above points, and a main object of the present invention is to provide a high-load transmission in which a plurality of blocks are locked at each fitting portion in a pair of tension bands on both sides. In the V-belt, while avoiding stress concentration at the upper corner between the upper beam and the center pillar of each block by adding a device to the engagement shape between the fitting portion of each block and each tension band, To prevent heat generation deterioration due to friction at both upper and lower corners, and to prevent the canvas layer from being turned up when inserted into the fitting portion.
The purpose is to extend the life of the belt.

[0010]

In order to achieve the above object, according to the present invention, the upper corner of each block is formed to have an inclined cross section or an arc of cross section so that stress concentration on the upper corner is reduced. On the other hand, the upper and lower corners of each tension band are inclined or arc-shaped in cross section to form gaps between the upper and lower corners of each block, thereby reducing heat generation due to friction at the corners. At the same time, when the canvas layer is inserted into the fitting portion, it is difficult to turn over.

Specifically, according to the first aspect of the present invention,
An upper beam extending in the belt length direction and having a pair of endless tension bands arranged on both sides arranged in a line in the belt width direction, and an upper beam arranged on the back side of the belt so as to extend in the belt width direction; A lower beam arranged on the inner surface to extend in the belt width direction corresponding to the upper beam and the belt thickness direction, a center pillar connecting these two beams to each other at the center in the belt width direction, and a belt width direction The upper and lower beams have a slit-shaped fitting portion formed by the upper and lower beams and the center pillar, and the tension bands on both sides are fitted to the fitting portions on both sides thereof. A high load transmission V-belt including a plurality of blocks locked at equal intervals in the belt length direction is assumed.

Each of the blocks has an upper corner having a substantially inclined cross section between the upper beam and the center pillar at the fitting portion of the block. On the other hand, the upper corner corresponding to the upper corner of each block in each tension band is
It is assumed that a gap is formed between the upper corner and the upper corner.

In the above configuration, for example, when a high-load transmission V-belt is wound around two speed-change pulleys on the driving side and the driven side to perform belt transmission, the belt is:
The block receives the reaction force from the pulley and transmits the force to the tension band to apply tension to the tension band. The reaction force is applied to the upper and lower beams of each block. The stress generated in each block tends to concentrate mainly on the upper corner between the upper beam and the center pillar in each fitting portion.

At this time, since the upper corner of each of the blocks has a substantially inclined cross section, stress concentration on the upper corner as in the case where the upper corner is perpendicular to the cross section is avoided. Therefore, the premature destruction of each block due to the stress concentration is avoided, and the possibility that the belt life is shortened due to such a failure of the block is prevented. further,
When a reinforcing material is buried in each of the blocks, the restriction on the shape of the reinforcing material is reduced by the amount that the upper corner is substantially inclined in cross section, so that the reinforcement of the block by the reinforcing material is optimized. You.

Since a gap is formed between the upper corner of each block and the upper corner of each tension band, the upper corner of each tension band contacts the upper corner of each block. Things can be suppressed. Therefore, heat generation at the upper corner portion due to friction with the upper corner portion is reduced, so that deterioration of the tension band due to such heat generation is suppressed.

According to a second aspect of the present invention, in the first aspect of the invention, each block has an upper corner portion having a substantially arc-shaped cross section instead of the upper corner portion having a substantially inclined cross section.

In the above configuration, the upper corner of the fitting portion of each block has a substantially arc-shaped cross section. Therefore, stress concentration on the upper corner is avoided. In addition, since a gap is formed between the upper corner of each block and the upper corner of the tension band, the upper corner of each tension band is prevented from contacting the upper corner of each block. . Therefore, also in the present invention, the same operation as in the case of the first aspect of the invention is performed.

According to the third aspect of the present invention, in the first or second aspect,
In the invention, the upper corner of each tension band is formed to have a substantially inclined cross section so as to form a gap between the upper corner of each block.

In the above configuration, the upper corner of each tension band has a substantially inclined cross section forming a gap with the upper corner of each block. Specifically, when the upper corner of the block has a cross-sectional inclination shape in which the inclination angle θ with respect to the side surface of the center pillar is θ = α, the upper corner portion with respect to the end surface of the tension band facing the side surface of the center pillar. Is the angle of inclination θ
= Β> α. Thereby, a gap having a triangular cross section is formed between the upper corner of the block and the upper corner of the tension band. Even if the inclination angle θ is θ = β = α, the length of the inclined surface at the upper corner of the tension band is set to be longer than that at the upper corner of the block, so that a trapezoidal cross section is formed between them. Is formed. On the other hand, when the upper corner of the block has a substantially arc-shaped cross section, a substantially right-angled triangular gap is formed between the upper corner and the upper corner of the tension band. Therefore, the operation of the first aspect of the present invention is specifically performed.

Further, when an upper canvas layer is provided on the back side of the belt of each tension band, when inserting each tension band into the fitting portion of each block, the upper canvas layer is attached to the fitting portion. It is unlikely that it will be caught at the entrance end of the car. This suppresses the occurrence of problems such as early wear of the tension band and heat generation, which are likely to occur in the turned-up portion of the canvas layer.

According to a fourth aspect of the present invention, in the first or second aspect,
In the present invention, it is assumed that the upper corner of each tension band has a substantially arc-shaped cross section so as to form a gap with the upper corner of each block.

In the above configuration, the upper corner of each tension band has a substantially arc-shaped cross section that forms a gap with the upper corner of each block. Therefore, also in the present invention, the same operation as in the case of the third aspect of the invention is performed.

According to a fifth aspect of the present invention, in each of the first to fourth aspects of the present invention, each block has a lower corner portion having a substantially inclined cross section between the lower beam and the center pillar in the fitting portion of the block. . On the other hand, it is assumed that a lower corner corresponding to a lower corner of each block in each tension band is provided so as to form a gap between the lower corner and the lower corner.

In the above configuration, the lower corner between the lower beam and the center pillar in the fitting portion of each block has a substantially inclined cross section. A gap is also formed between the lower corner and the lower corner of each tension band as in the case of the upper corner and the upper corner. Therefore, also in the lower corner, the heat generation deterioration of the tension band due to friction can be suppressed as in the case of the upper corner. In particular, the inner surface of the belt of each tension band may have a gap between the lower corner of the tension band and the lower corner of the block when the belt winds around the pulley and deforms in the direction of spreading in the belt width direction. Since the belt is strongly compressed without being deformed by being sandwiched between the block and the pulley, the belt durability is further enhanced in combination with the operation of the first aspect of the present invention.

According to a sixth aspect of the invention, in the fifth aspect of the invention, each block has a lower corner portion having a substantially arc-shaped cross section instead of the lower corner portion having a substantially inclined cross section.

In the above configuration, the lower corner of the fitting portion of each block has a substantially arc-shaped cross section. A gap is formed between the lower corner and the lower corner of each tension band. Therefore, also in the present invention, the same operation as in the case of the fifth aspect of the invention is performed.

According to a seventh aspect of the present invention, in each of the first to fourth aspects of the present invention, when the cords extending in the belt length direction and arranged in the belt width direction are embedded in each tension band, A lower corner portion having a substantially right-angle cross section is provided between the lower beam and the center pillar in the fitting portion of the block.

In the above configuration, if the lower corner of each block has, for example, an inclined cross section or an arc of a cross section, the load applied to each portion of the core wire by the lower corner becomes non-uniform, and the fitting portion is fitted to the tension band. A component force acts in the direction of exiting from the side,
As a result, there is a possibility that the core wire may be damaged early or the tension band may be damaged early. On the other hand, since the load applied to each portion of the core wire is made uniform, early breakage of the core wire and early breakage of the tension band due to such uneven load are prevented.

According to an eighth aspect of the present invention, in the seventh aspect of the present invention, a lower corner portion corresponding to a lower corner portion of each block in each tension band has a substantially right-angle cross section.

In the above construction, the lower corner of each block has a substantially right-angle cross-section while the lower corner of each tension band has a substantially right-angle cross-section. Although such a gap is not formed, the operation according to the seventh aspect of the invention is specifically and appropriately performed.

According to a ninth aspect of the present invention, in the invention of the seventh aspect, a lower corner corresponding to a lower corner of each block in each tension band is provided so as to form a gap with the lower corner. Shall be

In the above configuration, the lower corner of each block, which is substantially perpendicular to the cross section, and the lower corner of each tension band are also provided.
A gap is formed as in the case of the upper corner of each block and the upper corner of each tension band. Therefore, also in the present invention, the same operation as in the inventions of the fifth and sixth aspects is performed.

According to the tenth aspect, the fifth and sixth aspects are described.
In the invention according to the ninth aspect, the lower corner of each tension band is formed to have a substantially inclined cross section so as to form a gap with the lower corner of each block.

In the above construction, the lower corner of each tension band has a substantially inclined cross section which forms a gap between the lower corner of each block. The action is performed specifically and properly.

Further, when a lower canvas layer is provided on the inner side of the belt of each of the tension bands, when inserting each tension band into the fitting portion of each block, the lower canvas layer is attached to the fitting portion. It is unlikely that it will be caught at the entrance end of the car. As a result, in the same manner as in the third and fourth aspects of the invention, it is possible to suppress the occurrence of problems such as early wear of the tension band and heat generation which are likely to occur in the turned-up portion of the lower canvas layer.

According to the eleventh aspect, in the fifth and sixth aspects,
In the invention according to the ninth aspect, the lower corner of each tension band is formed to have a substantially arc-shaped cross section so as to form a gap with the lower corner of each block.

In the above configuration, the lower corner of each tension band has a substantially inclined cross section that forms a gap with the lower corner of each block. Therefore, also in the present invention, the same operation as in the case of the tenth invention is performed.

According to the twelfth aspect of the present invention, the above-mentioned first to first aspects are described.
In the invention of the first aspect, it is assumed that a gap in a belt width direction is formed between a center pillar of each block and each tension band so as to extend in a belt thickness direction.

In the above arrangement, the gap between each tension band and the center pillar of each block suppresses the contact between each tension band and the center pillar of each block. Heat generation due to friction between them is reduced. Therefore, deterioration of the tension band due to such heat generation is efficiently suppressed.

[0040]

Embodiments of the present invention will be described below with reference to the drawings. (Embodiment 1) FIG. 2 shows the overall structure of a high-load transmission V-belt according to Embodiment 1 of the present invention. Used in forming a belt-type continuously variable transmission by being wound between two drive pulleys on the driving side and the driven side, and a pair of endless ends arranged side by side in the belt width direction. A number of blocks 9, 9, ... are locked and fixed at equal intervals in the belt length direction in the tension bands 1, 1.

Each of the tension bands 1 has an upper rubber layer 2 and a lower rubber layer 3 made of an elastomer, and extends between these rubber layers 2 and 3 substantially in the belt length direction and at a predetermined pitch interval in the belt width direction. And core wires 4 arranged in a spiral so as to be arranged side by side. An upper canvas layer 5 is integrally provided on the upper surface of the upper rubber layer 2, and a lower canvas layer 6 is integrally provided on the lower surface of the lower rubber layer 3. further,
On the upper surface of each of the tension bands 1, there are provided a number of upper surface grooves 7 each having a concave cross-section provided so as to extend in the belt width direction.
However, on the lower surface, a plurality of lower surface grooves 8 each having an arc-shaped cross section are provided at predetermined pitch intervals in the belt length direction (left-right direction in FIG. 2). And it is arranged so that it may correspond to up and down.

On the other hand, each of the blocks 9 has a main body made of synthetic resin or the like, and as shown schematically in FIG.
An upper beam 10 arranged on the back side of the belt (upper side in the figure) so as to extend in the belt width direction (left-right direction in the figure);
The upper beam 10 and a lower beam 11 arranged on the inner surface side of the belt (the lower surface side in the figure) so as to extend in the belt width direction corresponding to the vertical direction in the belt thickness direction (the vertical direction in the figure); A center pillar 12 for connecting the beams 10 and 11 to each other at the center in the belt width direction, and a slit-shaped fitting portion 13 formed on both sides in the belt width direction by the two beams and the center pillar 12 (one side in FIG. Part fitting part 13
Only shown). Both side surfaces of each block, that is, both end surfaces of both the upper and lower beams 10 and 11 are slidable contact portions 14 that slidably contact the groove surfaces of the speed change pulley. Fitting part 1
The upper edge of the upper beam 3, that is, the lower side of the upper beam 10 has a convex shape in cross section projecting downward, and
A downward projecting ridge 15 that engages with the upper surface groove 7 is provided. On the other hand, the lower edge of the fitting portion 13, that is, the upper side of the lower beam 11, has an upwardly protruding ridge 1 which has an arcuate cross-sectional shape and which engages with the lower surface groove 8 of the tension band 1.
6 are provided. In each block 9 formed as described above, as shown in FIG. 3, a reinforcing member 17 is embedded by insert molding.

In this embodiment, each of the blocks 9 is provided with an upper beam 10 at a fitting portion 13 of the block 9.
And a center pillar 12 between the lower beam 11 and the center pillar 1.
2 has a lower corner 9b having a similar cross-sectional slope, while an upper corner 1a corresponding to the upper corner 9a of each of the blocks 9 in each of the tension bands 1 is provided with the upper corner 9a. Inclined so as to form a gap between them (the inclination angle is, for example, 4
5 °) and a lower corner 1b corresponding to the lower corner 9b. A similar cross section is formed so as to form a gap between the lower corner 9b. Specifically, the lengths of the inclined portions of the upper and lower corners 1a of each of the tension bands 1 are set to be longer than the lengths of the inclined portions of the upper and lower corners 9a and 9b of each block 9. A gap having a trapezoidal cross section is formed between them.

The reinforcing member 17 has an arcuate cross-section at portions corresponding to the upper and lower corners 9a and 9b of each block 9, and is close to the inner wall surface of the fitting portion 13 at other portions. Further, it is substantially linear along the inner wall surface.

Next, the upper and lower corners 9a, 9 of each block 9 in the high load transmission V-belt constructed as described above.
b and the respective actions of the upper and lower corners 1a and 1b of each tension band 1 will be described. When the belt is wound around the two speed change pulleys on the drive side and the driven side to perform belt transmission, the belt receives a reaction force from the pulley in each block 9 and transmits the force to each tension band 1. A tension is applied to the tension band 1,
The reaction force mainly acts on the upper beam 10 of each block 9.
Then, the stress generated in each block 9 tends to concentrate mainly on the upper corner 9 a between the upper beam 10 and the center pillar 12 in each fitting portion 13. At this time, since the upper corners 9a of the respective blocks 9 are inclined in cross section, stress concentration on the upper corners as in the case where the upper corners of the respective blocks are rectangular in cross section is avoided.

The upper and lower corners 9 of each block 9
a, 9b and the upper and lower corners 1a, 1b of each tension band 1 have respective gaps formed therebetween.
The upper and lower corners 1a, 1b of the
Contact with 9b is suppressed. Therefore, the upper and lower corners 9
Since the heat generation at the upper and lower corners 1a, 1b due to friction with the a, 9b is reduced, the heat generation deterioration of the tension bands 1, 1 is suppressed.

Further, the upper and lower corners 1a,
Since each of the tension bands 1 is inserted into the fitting portion 13 of each block 9, the upper canvas layer 5 and the lower canvas layer 6 are attached to the respective entrance ends of the fitting portion 13, That is, the lower edge of the sliding contact portion 14 of the upper beam 10 and the lower beam 11
Is hardly caused to be caught by the upper edge of the sliding contact portion 14. As a result, heat generation and early wear of the tension band 1 that are likely to occur at the turned-up portions of the upper canvas layer 5 and the lower canvas layer 6 can be suppressed.

Further, the upper and lower beams 10 and
The connecting portions between the portion arranged on the center pillar 11 and the portion arranged on the center pillar 12 are formed in a smooth sectional shape using the corners 9a and 9b.
Each of the above-mentioned parts can be provided in a state of being close to the fitting part 13, so that sufficient reinforcement for the block body can be performed. That is, as shown in FIG. 16, when the corners e and g of each block A have a right angle in cross section, the reinforcing member k can be used to form both connection portions in a smooth cross section. It is necessary to retreat each part arranged on the beams a and b and the center pillar c from the fitting part d greatly,
This tends to result in insufficient reinforcement of the block body.

Therefore, according to the present embodiment, both sides 1
In a high-load transmission V-belt in which a number of blocks 9, 9,... Are locked in a pair of tension bands 1, 1 at each fitting portion 13, the upper corner 9a of each block 9 has a slanted cross section. On the other hand, the upper and lower corners 1a and 1b of each tension band 1 are formed so as to have a cross-sectional inclination larger than that of the corners 9a and 9b of each block 9 so as to be between the upper corner 1a and the upper corner 9a and the lower corner. Part 1b
A gap is formed between the upper corner 9a of the block 9 and the lower corner 9b, so that stress concentration at the upper corner 9a of each block 9 can be avoided, and the shape of the reinforcing member 17 embedded in each block 9 is reduced. While the regulations can be relaxed and the blocks 9 can be properly reinforced and the early destruction of each block 9 can be prevented beforehand, the upper and lower corners 1 of each tension band 1 can be prevented.
a, 1b, it is possible to suppress heat generation deterioration, and when the tension band 1 is inserted into the fitting portion 13 of each block 9, the upper and lower canvas layers 5, 6 of the tension band 1 are turned up. The generation of heat and early abrasion can be avoided, so that the life of the high load transmission V-belt can be extended.

In the first embodiment, the upper and lower corners 9a and 9b of each block 9 and the upper and lower corners 1a and 1
Although each inclination angle of b is set to 45 °, the value of the inclination angle is not particularly limited, and may be different from each other.

In the first embodiment, each block 9
The upper and lower corners 9a and 9b of each tension band 1 have an inclined cross section, while the upper and lower corners 1a and 1b of each tension band 1 have an inclined cross section. Both or one of the corners has an arcuate cross section. You may do so.

(Embodiment 2) FIG. 4 schematically shows a main part of a high-load transmission V-belt according to Embodiment 2 of the present invention. Lower corner 9b of block 9 and upper and lower corners 1 of each tension band 1
Both a and 1b are inclined in cross section.

In the present embodiment, each of the blocks 9 has an upper corner 9a having an arc-shaped cross section. That is, the lower corner 9b of each block 9 and the upper and lower corners 1 of each tension band 1
a and 1b are both inclined in section, while each block 9
The upper corner 9a has an arc-shaped cross section. Note that the other parts are the same as those in the first embodiment, and a description thereof will not be repeated.

Therefore, according to the present embodiment as well, stress concentration at the upper corner 9a of each block 9 can be avoided, and the restriction on the shape of the reinforcing member 17 embedded in each block 9 is relaxed so that the block 9 can be properly formed. While it is possible to reinforce and prevent the early destruction of each block 9 beforehand, it is possible to suppress the heat generation deterioration at the upper and lower corners 1a and 1b of each of the tension bands 1 and to prevent the fitting portion 13 of each block 9 from being damaged.
When the tension band 1 is inserted into the tension band 1, heat generation and early wear of the tension band 1 due to turning up of the upper and lower canvas layers 5, 6 of the tension band 1 can be avoided. Similarly, the life of the high load transmission V-belt can be extended.

In the second embodiment, each block 9 has an upper corner 9a having an arcuate cross section, while the upper corner 1a of each tension band 1 has an inclined cross section. The corners may be arc-shaped in cross section. In this case, the gap is formed by setting the radius of curvature of the upper corner of each tension band larger than the radius of curvature of the upper corner of each block.

(Embodiment 3) FIG. 5 schematically shows a main part of a high-load transmission V-belt according to Embodiment 3 of the present invention. In this belt, both upper and lower corner portions 1a of each tension band 1 are shown. ,
1b are both inclined in cross section as in the first embodiment. The same parts as those in the first embodiment are denoted by the same reference numerals.

In this embodiment, each block 9
Have an upper corner 9a and a lower corner 9b, each having an arc-shaped cross section. That is, both upper and lower corners 9a and 9b of each block 9 are arc-shaped in cross section, while both upper and lower corners 1
Both a and 1b have an inclined cross section. Note that the other parts are the same as those in the first embodiment, and a description thereof will be omitted.

Therefore, according to the present embodiment, the same effects as those of the first embodiment can be obtained.

In the third embodiment, each block 9 has a lower corner 9b having an arcuate cross section, whereas the lower corner 1b of each tension band 1 has an inclined cross section. The section may have an arc shape. In this case, as described in the second embodiment, the gap is formed by setting the radius of curvature of the lower corner of each tension band larger than the radius of curvature of the lower corner of each block.

(Embodiment 4) FIG. 6 schematically shows a main part of a high-load transmission V-belt according to Embodiment 4 of the present invention. Both upper and lower corners 1a, 1b of the tension band 1 are inclined in cross section. The upper corner 9a of each block 9 is also inclined in cross section.

In the present embodiment, the lower corner 9b of each block 9 has an arc-shaped cross section. That is, the upper corner 9a of each block 9 and the upper and lower corners 1a of each tension band 1,
1b, the lower corner 9b of each block 9 has an arc-shaped cross section. The other parts are the same as in the first embodiment, and a description thereof will not be repeated.

Therefore, according to the present embodiment, the same effects as those of the first embodiment can be obtained.

(Embodiment 5) FIG. 7 schematically shows a main part of a high-load transmission V-belt according to Embodiment 5 of the present invention. In this V-belt, as in the case of Embodiment 1,
Each block 9 has an upper corner 9a having an inclined cross section, and the upper corner 1a of each tension band 1 has an inclined cross section that forms a gap with the upper corner 9a. The lower corner 9b of each block 1 has the same cross-sectional slope as the upper corner 9a, and the lower corner 1b of each tension band 1 is provided so as to form a gap between the lower corner 9b and the tension band 1. And has the same cross section as the upper corner 1a. That is, both upper and lower corners 9a and 9b of each block 9 and both upper and lower corners 1a and 1b of each tension band 1 have inclined cross sections.

In this embodiment, a gap S in the belt width direction is formed between the center pillar 12 of each block 9 and each tension band 1 so as to extend in the belt thickness direction.

Next, the operation of the gap S between the center pillar 12 and each tension band 1 will be described. The contact between the center pillar 12 of each block 9 and each tension band 1 is avoided by the gap S. Therefore, heat generation due to friction between each block 9 and each tension band 1 is greatly reduced. Therefore, the deterioration of the tension band 1 due to such heat generation can be efficiently suppressed.

Therefore, according to the present embodiment, the same effects as those of the first embodiment can be obtained, and the contact of each tension band 1 with the center pillar 12 of each block 9 can be avoided. Heat generation deterioration of the tension band 1 can be further suppressed.

(Embodiment 6) FIG. 8 schematically shows a main part of a high-load transmission V-belt according to Embodiment 6 of the present invention. In this belt, as in the case of the first embodiment, the upper corner 1a of each tension band 1 and the upper corner 9a of each block 9 are formed.
Are both inclined in cross section.

In the present embodiment, unlike the first to fifth embodiments, each of the blocks 9 has a lower corner 9b having a right-angle cross section. On the other hand, the lower corner 1 of each tension band 1
b also has a right-angle cross section.

Next, the operation of the lower corner 9b of each block 9 in the high load transmission V-belt constructed as described above will be described. As schematically shown in FIG. 9, for example,
When the lower corner h of each block A has an inclined cross section,
When a load is applied to the belt inner surface side (lower side in the figure) on the tension band B, the lower corner h is radially outward (upper side in the figure).
Is applied to the portion of the cord e located in the lower corner portion h so as to displace the tension band B in a direction (rightward direction in the figure) to laterally exit the tension band B from the fitting portion d. Premature breakage of the cord e and early breakage of the tension band B are likely to occur. On the other hand, since the lower corner portion 9b of this embodiment has a right-angle cross section, such an effect does not occur, and the load applied to each portion of the core wire 4 is made uniform. The lower corner 9b is formed to have a rectangular cross section in order to prevent the tension band 1 from generating a component force such that the tension band 1 is displaced in the above-described direction. The cross section may have a substantially right-angled shape such as a round shape.

Therefore, according to the present embodiment, the effect of the upper corner 9a of each block 9 and the upper corner 1a of each tension band 1 is the same as that of the first embodiment, while the effect of each tension band 1 is The upper corner portion of each tension band 1 has a lower corner portion 1b corresponding to each block 9
Is in contact with the lower corner 9b as before,
By making the lower corner portion 9b a rectangular shape in cross section, the load applied to each part of the core wire 4 can be made uniform, and therefore, the early breakage of the core wire 4 due to such nonuniform load, Premature breakage of each tension band 1 can be prevented.

(Embodiment 7) FIG. 10 schematically shows a main part of a high-load transmission V-belt according to Embodiment 7 of the present invention.

In the belt, as in the case of the sixth embodiment, each block 9 has an upper corner 9a having an inclined cross section, while the upper corner 1a of each tension band 1 has an inclined cross section. The lower corner 9b of each block 9 and the lower corner 1b of each tension band 1 are both rectangular in cross section.

In this embodiment, each of the tension bands 1
The upper corner portion 1 with respect to the center end surface of the tension band 1 at
is set to be larger than the inclination angle β of the upper corner 9a with respect to the side surface of the center pillar 12 in each block 9 (α> β). A gap having a triangular cross section is formed between the corner and the corner 1a. Note that the other parts are the same as those in the first embodiment, and a description thereof will not be repeated.

Therefore, according to the present embodiment, the same effect as that of the sixth embodiment can be obtained.

(Embodiment 8) FIG. 11 schematically shows a main part of a high-load transmission V-belt according to an eighth embodiment of the present invention.
Each block 9 has an upper corner 9a having an inclined cross section and a lower corner 9b having a right angle in cross section, while the upper corner 1a of each tension band 1 is provided.
Has a slanted cross section that forms a gap with the upper corner 9a of each block 9 described above.

In this embodiment, each of the tension bands 1
Unlike the sixth embodiment, the lower corner portion 1b has an inclined cross section that forms a gap between the lower corner portion 9b of each block 9 described above. That is, the upper corner 9a of each block 9
The upper and lower corners 1a and 1b of each tension band 1 are both inclined in cross section, while the lower corner 9b of each block 9 is formed in a right angle in cross section.

Therefore, according to the present embodiment, the lower corner 9b of each block 9 is made to have a right angle in cross section, and the lower corner 1b of each tension band 1 is made to have an inclined cross section.
Since the gap is formed between the first and second embodiments, the same effect as that of the sixth embodiment can be obtained, in addition to the same effect as that of the sixth embodiment.

In the eighth embodiment, the upper corner 1a of each tension band 1 is inclined in cross section. However, a gap is formed between the upper corner 9a of each block 9 in an arc cross section. It may be.

(Embodiment 9) FIG. 12 schematically shows a main part of a high-load transmission V-belt according to Embodiment 9 of the present invention.
Each block 9 has an upper corner 9a with a cross section inclined and a lower corner 9b with a right angle cross section, while the upper corner 1a of each tension band 1 has a cross section with an inclination.

In this embodiment, each of the tension bands 1
The lower corner 1b has an arc-shaped cross section so as to form a gap with the lower corner 9b of each of the blocks 9. That is, the upper corner 9a of each block 9 and the upper corner 1a of each tension band 1 are both inclined in cross section, while the lower corner 1b of each tension band 1 is arc-shaped in cross section. Lower corner 9b
Has a right-angle cross section.

More specifically, the cross-sectional shape of each of the lower corners 1 a and 1 b is such that the lower surface of the core wire 4 in the tension band 1 and the tension band 1
It has a radius R (<K) smaller than the dimension K in the thickness direction of the belt between itself and the lower surface thereof, and is a 1/4 circular arc which is smoothly connected to the end surface and the lower surface of the tension band 1 respectively.
Note that the other parts are the same as those in the first embodiment, and a description thereof will be omitted.

Therefore, according to the present embodiment, the same effect as that of the eighth embodiment can be obtained.

(Embodiment 10) FIG. 13 schematically shows a main part of a high-load transmission V-belt according to Embodiment 10 of the present invention. The block 9 has a lower corner 9b having a right-angle cross section, and both upper and lower corners 1a and 1b of each tension band 1 have an inclined cross section.

In the present embodiment, each of the blocks 9 has an upper corner 9a having an arc-shaped cross section. That is, the upper corner 9a of each block 9 has an arc-shaped cross-section, while the lower corner 9b has a right-angle cross-section.

Therefore, the present embodiment can provide the same effects as in the eighth embodiment.

In the tenth embodiment, the upper corner 1a of each tension band 1 is inclined in cross section. However, the upper corner 9a of each block 9 is formed to have an arc cross section larger than the radius of curvature of the upper corner 9a. 9a may be formed.

[Combination Pattern of Block and Tension Band]
Here, as a high load transmission V-belt according to the embodiment of the present invention, a combination pattern of a block and a tension band is also shown in Table 1 below. In the table, the combination patterns in the present invention are indicated by “「 ”, and the patterns according to Embodiments 1 to 10 are indicated by the numbers of the embodiments.

[0088]

[Table 1]

[0089]

As described above, according to the first aspect of the present invention, there is provided a high-load transmission V-belt in which a plurality of blocks are locked at a fitting portion in a pair of tension bands on both sides.
The upper corner between the upper beam and the center pillar in the fitting portion of each block has a substantially inclined cross section, and a gap is formed between the upper corner of each tension band and the upper corner. As described above, stress concentration at the upper corners of each of the blocks can be avoided, and when a reinforcing material is embedded in each block, restrictions on the shape of the reinforcing material are relaxed so that the blocks can be properly adjusted. While it is possible to reinforce and prevent the premature destruction of each block, it is possible to suppress heat deterioration due to friction with the upper corner of each tension band, thereby improving belt durability. The service life can be extended.

According to the second aspect of the present invention, the upper corner of each block is formed to have a substantially arcuate cross section instead of a substantially inclined cross section. The same effect can be achieved.

According to the third aspect of the present invention, the upper corner of each tension band has a substantially inclined cross section in which a gap is formed between the upper corner of each block. Not only can the effects of the second invention be specifically obtained, but also when the upper canvas layer is provided on the back side of the belt of each tension band, each tension band is inserted into the fitting portion of each block. In this case, it is possible to make it difficult for the upper canvas layer to be caught by the entrance end of the fitting portion and to be turned over, and to generate troubles such as heat generation and early wear of the tension band easily generated at the turned portion of the upper canvas layer. Can be suppressed.

According to the fourth aspect of the present invention, the upper corner of each tension band is formed in a substantially arc-shaped cross section in which a gap is formed between each tension band and the upper corner of each block. The same effect as in the case of the third aspect of the invention can be obtained.

According to the fifth aspect of the present invention, the lower corner between the lower beam and the center pillar in the fitting portion of each of the blocks has a substantially inclined cross section, and the lower corner of each tension band is connected to the lower corner. Since a gap is formed between the tension bands, the lower corners of the tension bands can also suppress the heat generation deterioration of the tension bands due to friction as in the case of the upper corners, and as a result, Combined with the effects of the first and second aspects of the present invention, the durability of the belt can be further increased and the service life can be further extended.

According to the sixth aspect of the present invention, the lower corners of the respective blocks are formed to have a substantially arc-shaped cross section instead of a substantially inclined cross section. The effect can be achieved.

According to the seventh aspect of the present invention, when the cords are buried in the tension bands, the lower corners of the blocks have a substantially right-angle cross section, so that they are applied to the respective portions of the cords. The load can be made uniform, and early breakage of the core wire and early breakage of the tension band due to such uneven load can be prevented.

According to the eighth aspect of the present invention, the lower corner of each of the tension bands is formed to have a substantially right-angle cross section, so that the effect of the seventh aspect of the invention can be specifically obtained.

According to the ninth aspect of the present invention, the lower corner of each tension band is provided so as to form a gap with the lower corner of each block. Thus, similarly to the case of the fifth and sixth aspects, it is possible to reduce the heat generation deterioration of the lower corner portion of each tension band.

According to the tenth aspect of the present invention, the lower corner of each tension band has a substantially inclined cross section in which a gap is formed between the lower corner and each block. Not only can the effect be obtained specifically, but also when the lower canvas layer is provided on the belt inner surface side of each of the tension bands, when inserting each tension band into the fitting portion of each block, A situation in which the lower canvas layer is caught on the entrance end of the fitting portion and peels off can be made less likely to occur, and therefore, as in the case of the third aspect of the present invention, a tension band easily generated on the peeling portion of the lower canvas layer. The occurrence of problems such as early abrasion and heat generation can be suppressed.

According to the eleventh aspect of the present invention, the lower corner of each of the tension bands has a substantially arc-shaped cross section in which a gap is formed between the lower corner of each block. The same effect as in the case of the invention of Item 10 can be obtained.

According to the twelfth aspect of the present invention, since a gap in the belt width direction is formed between the center pillar of each block and each tension band, the gap between the center pillar of each block and each tension band is formed. Heat generation due to friction can be reduced, and deterioration of the tension band due to such heat generation can be efficiently suppressed.

[Brief description of the drawings]

FIG. 1 is an enlarged cross-sectional view taken along line II of FIG.

FIG. 2 is a perspective view showing the overall configuration of a high-load transmission V-belt according to Embodiment 1 of the present invention.

FIG. 3 is a view for explaining a shape of a reinforcing material of the block;
FIG. 3 is an enlarged sectional view taken along line III-III of FIG.

FIG. 4 is a diagram corresponding to FIG. 1, schematically showing a main part of a high-load transmission V-belt according to a second embodiment of the present invention.

FIG. 5 is a diagram corresponding to FIG. 1, schematically showing a main part of a high-load transmission V-belt according to a third embodiment of the present invention.

FIG. 6 is a diagram corresponding to FIG. 1, schematically illustrating a main part of a high-load transmission V-belt according to a fourth embodiment of the present invention.

FIG. 7 is a diagram corresponding to FIG. 1, schematically illustrating a main part of a high-load transmission V-belt according to a fifth embodiment of the present invention.

FIG. 8 is a diagram corresponding to FIG. 1, schematically illustrating a main part of a high-load transmission V-belt according to a sixth embodiment of the present invention.

FIG. 9 is a diagram corresponding to FIG. 1 for explaining displacement of a tension band in a high-load transmission V-belt in which a lower corner portion of a block has an inclined cross section.

FIG. 10 is a diagram corresponding to FIG. 1, schematically showing a main part of a high-load transmission V-belt according to a seventh embodiment of the present invention.

FIG. 11 is a diagram corresponding to FIG. 1, schematically showing a main part of a high-load transmission V-belt according to an eighth embodiment of the present invention.

FIG. 12 is a diagram corresponding to FIG. 1, schematically showing a main part of a high-load transmission V-belt according to a ninth embodiment of the present invention.

FIG. 13 shows a high-load transmission V according to a tenth embodiment of the present invention.
FIG. 2 is a diagram corresponding to FIG. 1 schematically illustrating a main part of a belt.

FIG. 14 is a diagram corresponding to FIG. 1 schematically and exaggeratedly showing a change in the cross-sectional shape of a tension band of a conventional high-load transmission V-belt.

FIG. 15 is a diagram corresponding to FIG. 1 and schematically and exaggeratedly showing the turning of the upper and lower canvas layers of the tension band.

FIG. 16 is a diagram corresponding to FIG. 3 for explaining the shape of a reinforcing material of a block in a conventional high-load transmission V-belt.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tension band 1a Upper corner 1b Lower corner 4 Core wire 9 Block 9a Upper corner 9b Lower corner 10 Upper beam 11 Lower beam 12 Center pillar 13 Fitting part

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-5-10396 (JP, A) JP-A 5-153839 (JP, A) JP-A 63-152947 (JP, U) JP-A 4-152947 68235 (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) F16G 5/16

Claims (12)

(57) [Claims] 1. A pair of endless tension bands each extending in the belt length direction and arranged in the belt width direction, each being disposed on the back side of the belt so as to extend in the belt width direction. An upper beam, a lower beam disposed on the inner surface side of the belt so as to extend in the belt width direction corresponding to the upper beam and the lower direction of the belt thickness direction, and a center pillar that couples the two beams to each other at the center in the belt width direction And a slit-shaped fitting portion formed by the upper and lower beams and the center pillar on both sides in the belt width direction, and the tension bands on both sides are fitted into the fitting portions on both sides to form the two belts. A high-load transmission V-belt comprising a plurality of blocks locked at equal intervals in a belt length direction in a tension band, wherein each of the blocks includes the upper beam and the center pillar at a fitting portion of the block. An upper corner corresponding to the upper corner of each of the blocks in each of the tension bands is provided so as to form a gap between the upper corner and the upper corner. A high-load transmission V-belt characterized by being provided. 2. The high-load transmission V-belt according to claim 1, wherein each block has an upper corner portion having a substantially arc-shaped cross section instead of an upper corner portion having a substantially inclined cross section. V belt for load transmission. 3. The V-belt for high load transmission according to claim 1, wherein an upper corner of each tension band has a substantially inclined cross section so as to form a gap between the upper corner of each block. A high-load transmission V-belt characterized by being made. 4. The high-load transmission V-belt according to claim 1, wherein the upper corner of each tension band has a substantially arc-shaped cross section so as to form a gap between the upper corner of each block. A high-load transmission V-belt characterized by being made. 5. The V-belt for high load transmission according to claim 1, wherein each block has a lower corner having a substantially inclined cross section between a lower beam and a center pillar at a fitting portion of the block. And a lower corner corresponding to the lower corner of each block in each tension band is provided so as to form a gap between the lower corner and the lower corner. . 6. The high-load transmission V-belt according to claim 5, wherein each block has a substantially arc-shaped lower corner instead of the lower-slope lower corner. For V-belt. 7. The high-load transmission V-belt according to claim 1, wherein core wires extending in the belt length direction and arranged in the belt width direction are embedded in each tension band. A high-load transmission V-belt having a lower corner portion having a substantially right-angle cross section between a lower beam and a center pillar in a fitting portion of the block. 8. The high-load transmission V-belt according to claim 7, wherein a lower corner corresponding to a lower corner of each block in each tension band has a substantially right-angle cross section. For V-belt. 9. The V-belt for high load transmission according to claim 7, wherein a lower corner corresponding to a lower corner of each block in each tension band is provided so as to form a gap between the lower corner and the lower corner. V-belt for high load transmission, characterized in that: 10. The V-belt for high load transmission according to claim 5, wherein a lower corner of each tension band has a substantially inclined cross section so as to form a gap between the lower corner of each block. A high-load transmission V-belt characterized by being made. 11. The high-load transmission V-belt according to claim 5, wherein the lower corner of each tension band has a substantially arc-shaped cross section so as to form a gap between the lower corner of each block. A high-load transmission V-belt characterized by being made. 12. The method of claim 1, 2, 3, 4, 5, 6, 7,
8. The high load transmission V-belt according to 8, 9, 10 or 11, wherein a gap in a belt width direction is formed between a center pillar of each block and each tension band so as to extend in a belt thickness direction. A high-load transmission V-belt characterized by the following: