JPS6135418B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a V-belt transmission device using a metal V-belt.

The applicant of the present application has previously developed a device of this type in which a plurality of V-shaped metal members and a plurality of hollow roller-shaped elastic metal members are mounted on a metal belt member made by laminating a plurality of endless metal plates. are arranged alternately in contact with each other to form a V-belt, which is stretched between a V-pulley on the driving side and a V-pulley on the driven side,
When each of the V-shaped metal members is engaged with the V-groove of the V-pulley and rotates accordingly, tension-side drive is applied to the belt member through each of the V-shaped metal members, causing the belt member to rotate. However, in this case, the belt member would be bent by each V-pulley and repeatedly bent, and each metal plate of the belt member would be bent repeatedly. It is desired to improve the life of the belt member by equalizing the applied bending stress.

In other words, when the thickness of each metal plate is made equal, the metal plate in the inner layer with a smaller rotation radius is subjected to a larger bending stress and fatigues earlier, making it necessary to replace the V-belt.To solve this problem. is desired. The object of the present invention is to obtain a device that meets such demands. A plurality of V-shaped metal members and an elastic A plurality of metal members are arranged alternately in contact with each other to form a V-belt, and this is stretched between a drive-side V-pulley and a driven-side V-pulley to generate power between both pulleys. The V-belt transmission device is characterized in that the thickness of each metal plate of the metal belt member is made thinner as the inner layer.

Next, the present invention will be explained with reference to the illustrated embodiments.

In the drawing, 1 indicates a continuously variable transmission for motorcycles,
The transmission 1 has a V-belt 6 stretched between a V-groove 3 of a V-pulley 2 on the driving side and a V-groove 5 of a V-pulley 4 on the driven side to transmit power between both pulleys 2 and 4. The model shall be

The V-belt 6 is a steel band or other endless metal plate 7.
A plurality of V-shaped metal members 8 and an elastic metal member 9 are placed on a metal belt member 7 formed by laminating a plurality of V-shaped metal members 8.
In this case, each elastic metal member 9 consists of a hollow roller, which is connected to each pair of V-shaped metal members 8, 8 on both outer sides thereof. Each concave surface 10,1 formed on the opposing surface of
0 and the metal from its outer periphery.
The belt member 7 is tightened so that the metal belt member 7 is tightened with each elastic metal member 9.
Each V-shaped metal member 8 is pressed through this, so that these members 7, 9, and 8 are bonded by mutual pressure. In other words, each V-shaped metal member 8 is positioned and fixed on each metal belt member 7, and thus each V-shaped metal member 8 engages with the V-groove 3 of the V-pulley 2 on the drive side. When the belt member 7 rotates along with the rotation, the belt member 7 is given a tension-side drive. Furthermore, during such an operation, when each V-shaped metal member 8 rotates due to engagement with each V-pulley 2, 4, the V-shaped metal members 8 tilt relative to each other; It was done smoothly using rollers.

More specifically, each V-shaped metal member 8 is composed of a relatively thick plate-like block, and is provided with a substantially U-shaped through groove 11 that opens outward, and in which the belt member 7 is connected. Furthermore, a stopper member 13 for preventing slippage is inserted into and engaged between the left and right engaging grooves 12, 12 at the upper part of the through groove 11.
We prepared the following.

Furthermore, each of the above-mentioned V-shaped metal members 8 has one on both outer sides.
It is of a type that is slidably supported inwardly and outwardly between the pair of elastic metal members 9, 9, and is provided with an engaging surface 14 facing the inner circumferential surface of the belt member 7, so that each V-shaped metal When the member 8 engages with each of the V-pulleys 2 and 4, it is pushed by the V-pulleys 2 and 4 and slides outward to engage the engagement surface 1.
4, it is pressed against the belt member 7 and is bound thereto.

More specifically, each V-shaped metal member 8 has concave surfaces 10, 10 on both sides, for example, as clearly shown in FIG.
is engaged with each elastic metal member 9, 9,
In this case, the concave surfaces 10, 10 are formed to be more or less elongated in the inner and outer directions, that is, in the vertical direction in the drawing, so that the member 8
is allowed to slide inward and outward within this range, so that when each V-shaped metal member 8 engages in the V-groove 3 of the V-pulley 2 on the drive side, for example, as shown in the figure, The engagement surface 14 is pushed and slid outward.
The belt member 7 is pressed into contact with the belt member 7 and bound thereto. To further explain this, in the case shown in the figure, the bottom surface of the above-described through groove 11 is the engaging surface 14, and each V-shaped metal member 8 is connected to the V pulley 2,
4, that is, in the straight portion of the V-belt 6, there is some gap 15 between the engagement surface 14 and the belt member 7, but when engaged with each V-pulley 2, 4, That is, at the curved portion of the V-belt 6, each V-shaped metal member 8 slides outward (upward in the drawing) as described above, so that the engagement surface 14 and the belt member 7 are in pressure contact with each other. I made it.

Here, in the above embodiment, as clearly shown in FIGS. 3 and 4, the width of the plurality of metal plates 7a constituting the belt member 7 is made narrower as the inner layer becomes narrower, so that the cross-sectional shape of the belt member 7 is is formed into a stepped V-shape as a whole, and the above-mentioned engaging surface 14 is formed into a stepped V-shape in cross section that substantially matches this, so that each V-shaped metal member 8 is formed outwardly as described above. When the metal plate 7a of the belt member 7 is slid against the belt member 7, each stepped surface of the engagement surface 14 is pressed against the metal plate 7a of the belt member 7, and good bonding between the two surfaces 7 and 8 is achieved. However, the present invention is not limited to this. For example, as shown in FIG. good.

Here, each metal plate 7a of the belt member 7 has a V
Due to the bending of the pulleys 2 and 4, a larger bending moment is applied to the inner layer with a smaller rotation radius.According to the present invention, the thickness of the metal plates 7a is made thinner as the inner layer. Accordingly, the maximum bending stress of these metal plates 7a becomes approximately equal for each metal plate 7a, and the life of the belt member is improved.

To explain this in more detail, the maximum bending stress σmax of the metal plate 7a is expressed as σmax=M/I×t/2, where M is the bending moment, I is the second moment of area, and t is the wall thickness. , the thickness t of the inner layer metal plate 7a is reduced by the increase in bending moment M, so that there is no large difference in maximum bending stress σmax between the inner layer and the outer layer, and the inner layer is reduced by repeated bending. This prevents the metal plate 7a from becoming fatigued earlier than the outer layer.

In this way, according to the present invention, the wall thickness of each metal plate of the metal belt member is made thinner as the inner layer becomes thinner, so that the stress distribution when the belt member is bent by the V-pulley is better balanced, and the belt member This has the effect of improving the lifespan of.

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[Brief explanation of the drawing]

FIG. 1 is a side view of an example of the device of the present invention, FIG. 2 is an enlarged cross-sectional side view of the portion that engages with the drive V-pulley, and FIGS. 3 and 4 are the lines - and - in FIG. 2, respectively. FIG. 5 is a cross-sectional view of a modified example. 2... Drive V pulley, 4... Driven V pulley, 6
... V belt, 7 ... Metal belt member, 7a ...
Metal plate, 8... V-shaped metal member, 9... Elastic metal member. 〓〓〓〓

Claims (1)

[Claims] A V-belt is produced by sequentially and alternately arranging a plurality of V-shaped metal members and a plurality of elastic metal members in contact with each other on a metal belt member formed by laminating a plurality of endless metal plates. In the V-belt transmission device, the V-belt transmission device is configured such that the belt is stretched between a V-pulley on the driving side and a V-pulley on the driven side to transmit power between the two pulleys. A V-belt transmission device characterized in that the wall thickness of the V-belt is as thin as that of the inner layer.