JPS59131052A - Transmission belt - Google Patents

Abstract

PURPOSE:To enable the transmission of high motive power and improve the efficiency of transmission, by composing a transmission belt of an endless ring, numerous blocks continuously fitted on the ring and a coil spring surrounding the ring and the blocks. CONSTITUTION:A transmission belt 3 is composed of an endless ring 8 made of a combined material containing carbon fibers and an elastic material, blocks 9 arranged on the ring along its total circumference, and a spring 10 wound to surround the ring and the blocks along the total circumference. To manufacture the spring 10, a continuous spring material of rectangular cross section is processed into a trapezoidal shape coincident with the inclination of the V- groove a pulley and decreased in the distance between the sides 11 from the top 13 toward the bottom 12. The upper part of each block 9 is provided with a curved surface 94 and vertical surfaces 95 for pinch-holding the ring 8. To manufacture the endless ring 8, plural reinforcing elements 81 made of bundled carbon fibers are arranged and dipped in TPE plastic.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power transmission belt, and is effective when used, for example, in an automatic transmission for a vehicle engine, or (1) for transmitting engine driving force to auxiliary equipment such as a compressor or alternator. be.

The inventors of the present invention previously proposed a V-held in which a block is secured with a metal multilayer ring. However, simply preventing blocks has caused problems, such as the process of cutting and locking the blocks and rings due to misalignment between the respective layers of the rings is complicated.

In addition, in belts that were made up of two parts, a block and a ring, in order to connect the block to the ring, the block -
A locking tool had to be attached to each piece, making processing time-consuming. In addition, as shown in Fig. 4, if the block 90 and the rings 80a and 80b are used and the locking device is eliminated, the rings soa and sob can be used especially when transporting only the belt.
was removed from block 90. In addition, add 2 rings
The use of this block was costly, and the shape of the block 90 was complicated, making processing time-consuming.

It was also known to form a belt from a tension coil spring and a ring (Japanese Unexamined Patent Publication No. 57-65445), but this method lacked strength against the pressure applied to the side surface of the tension coil, and the Both rotations were difficult to drive.

The present invention was devised in view of the above points, and an object of the present invention is to provide a belt capable of transmitting a large amount of power and having good transmission efficiency.

An embodiment of the present invention will be described below based on the drawings.

In FIG. 1, reference numeral 1 denotes a drive pulley which is connected to, for example, a drive shaft 4 of an on-vehicle engine, and rotates in response to the driving force of the engine. The rotation of the drive pulley 1 is transmitted to the driven drive IJ 2 via the transmission belt 3 to rotate a gear group as a transmission or an operating shaft 5 of an auxiliary machine.

FIG. 2 shows the structure of the transmission belt 3. In the figure, 8 is an endless annular ring made of a composite material of carbon fiber and an elastic body (for example, rubber or resin), and 9 is a block made of a composite material of carbon fiber and metal, which are arranged around the entire circumference of the ring 8. Reference numeral 10 denotes a spring made of a spring material sown as to surround the entire circumference of the block 9 and ring 8.

(3) Next, the shape and material of each part will be explained in detail.

First, the spring 10 is connected to the pulley 1.2 as shown in FIG.
In consideration of sliding properties with the block 9 and the block 9, a spring material with a rectangular cross section is continuously machined, and the shape is trapezoidal with the V-shaped groove taper of the pulley.
is narrower, and the pitch e is constant over the entire circumference, making machining easier. It is more effective to set p to a smaller value with respect to the thickness of block 9, since the contact surface with pulleys l and 2 will increase. The material used is a spring material that is resistant to compression.

The shape of block 9 is shown in Figure 5.6.7. The side surface 91 is tapered in the same way as the spring 10 in order to slide on the spring side surface 11, and in FIG.
7 is formed.

In FIG. 7 (cross section), a curved surface 94 is formed as a contact surface for passing the ring 8 on the -L side, and vertical surfaces 95 that sandwich the ring 8 are formed on both sides of this curved surface 94 to face each other. has been done. Therefore, the ring 8 is (4) sandwiched between the vertical surface 95, the curved surface 94, and the upper side 13 of the spring 10. Note that the corners of the block 9 are processed into arc shapes that match the corners of the spring 10. Further, as the material for the block 9, a composite material is used in which carbon fiber sheets are stacked so that the fiber directions are perpendicular to each other and the entire structure is soaked in epoxy resin or polyimide resin.

The ring 8 has a cross section as shown in FIG. In the figure, reference numeral 81 indicates a reinforcing material made by bundling carbon fibers. A plurality of these reinforcing materials 81 are arranged, and in this state, the entire circumference is made of flexible resin TPE (thermo, plastic, elastomer) so that the cross section becomes a rectangle.
It is dipped in water to form an endless ring.

Next, the arrangement of each component will be explained. A large number of blocks 9 are arranged in a spaced manner around the entire circumference of the ring 8 and are surrounded by a spring 10 in this state.

Since the spring 10 slides on the block 9 with a change in the radius of curvature, the block side surface 91 and the spring side surface 11, the block lower (5) lfj 92 and the spring lower surface 12 are designed to move smoothly. The space between the parts is assembled as shown in Fig. 9, taking sliding properties into consideration. Also, spring 1
Both ends 10a and 10b of 0 are welded at the top of the block so that they do not come into contact with the pulley 1.2 (No. 10.11).
(Illustrated) Therefore, in the belt of this example, the ring 8 and the block 9 are locked together by surrounding the entire belt with the spring IO, so there is no need to lock the block 9 and the ring 8 for each block 9. Continuous processing becomes possible.

Further, since the shape of the Pro-7ri 9 is simple, the number of machining steps is reduced, and the time required for machining the block 9 can be reduced.

Next, the operation of the transmission belt constructed as described above will be explained.

When the pulley 12 is rotating at a constant speed ratio, the power transmission is such that the rotation of the drive pulley 1 first reaches the outer surface 1 of the side of the spring IO.
It is transmitted to 10. Therefore, a frictional force is required between the spring side outer surface 110 and the pulley surface, and in this example, a material with a rectangular cross section is used for the spring 10, and the pitch p
By closing them, the contact area is increased and frictional force is obtained. (6) The force transmitted to the spring side outer surface 110 is then transmitted to the block side surface 91.

When the belt 3 is rotating inside the pulley at the minimum radius, the side surfaces 121 of the spring 10 will come into contact at the front and back, and the block 9 will also come into contact at its front and rear surfaces 97, so that inside the pulley 1.2 The spring IO and the block 9 move together and are useful for improving the transmission efficiency.

Furthermore, regarding the contact between the spring 10 and the block 9,
The spring 10 receiving the force from the pulley 1 tries to slide on the pulley slope in the centrifugal direction. On the other hand, since the block 9 is prevented from moving in the centrifugal direction due to centrifugal force by the ring 8,
The spring IO is embedded in the block 9, and the block side surface 91 and the spring side surface 11 are brought into closer contact during rotation, and the two move as one, resulting in highly efficient power transmission.

Transmission of power between the driving pulley 1 and the driven pulley 2 is performed mainly by the ring 8 on the tension side 3a of the bell l-3. Of course, the power is also transmitted on the (7) compression side 3b of the belt 3, and on this compression side 3b, the block 9 contacts with its front and rear surfaces 97, and is transmitted via this block 9.

In conventional healds that were made up of only a spring and a ring, the spring bore all of the compressive force received from the pulley, which resulted in deformation of the spring, resulting in low transmission efficiency or breakage of the spring.

On the other hand, in this example, since the block 9 is disposed within the spring 8 material, the block 9 bears the side pressure applied to the spring 10. Therefore, high loads and high rotations are made possible by using a composite material in which carbon fiber, which has excellent compression resistance and is lightweight, is impregnated with epoxy or polyimide as the block 9 material.

In addition, conventional belts consisting only of blocks and rings require high frictional force between the blocks and pulley surfaces, and the block materials are limited. On the other hand, in the belt of this example, by using the spring 10 with excellent frictional force, the material of the block 9 can be freely selected and has compression resistance, and the lightweight (8) material can be used. .

Further, in this example, since only a tensile force acts on the spring 8, a material having a core of carbon fiber, which has excellent tensile force in the circumferential direction, is used for the spring 8 material.

In the above example, the spring 10 with a square cross section is used, but it is also possible to use a spring 10 with a circular cross section in view of the processing method and the cost I. In that case, it is desirable to increase the number of turns for each block 9 in consideration of contact with the pulley 2 and the inner block 9.

Further, as the material of the ring 8, glass fiber or Kevlar fiber other than carbon fiber may be used. In addition to the above-mentioned welding, the ends 10a and 10b of the spring 10 can be connected by, for example, making two holes in the upper part of the block 9.
This may be done by press-fitting the spring ends 10a, 10b into this direction.

The material of the block 9 may be glass long fibers and aluminum, carbon long fibers and ceramics, glass long fibers and ceramics, glass short fibers and aluminum, glass short fibers and ceramics, or carbon. A composite material consisting of short fibers and aluminum or short carbon fibers and ceramics may also be used. Further, as the material of the block 9, a single ceramic (silicon nitride) which can be operated without lubrication may be used.

Furthermore, in order to facilitate assembly, the spring 10 is attached to the belt 3.
The entire structure may be divided into two parts, and the three parts may be welded or connected to the block 9 by press-fitting or the like.

As described above, the power transmission belt of the present invention has a structure in which a ring and a block are surrounded by a spring, and the spring uses a spring material with a rectangular cross section that has excellent friction characteristics, so that the transmission effect from the pulley can be improved. I can do it. In addition, since the block is made of a lightweight material with high compressive strength against the side pressure from the pulley, high-speed operation under high loads is possible, which also improves transmission efficiency.

Furthermore, since the ring and block are locked together using a spring, there is no need for a special locking tool (10), which has the excellent effect of easy assembly.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing an embodiment of the power transmission belt according to the present invention, Fig. 2 is a cross-sectional view showing the connected state of the blocks shown in Fig. 1, and Fig. 3 shows a part of the trapezoidal spring shown in Fig. 1. FIG. 4 is a cross-sectional view of a conventional belt block, FIG. 5 is a perspective view of the block shown in FIG. 1, FIG. 6 is a side view of the block shown in FIG. 5 is a sectional view in the thickness direction of the block 10 shown in FIG. 8, FIG. 8 is a sectional view showing the ring shown in FIG. 10 is a front view of the spring shown in FIG. 1 without showing the welded lines at the end thereof, and FIG. 11 is a plan view of FIG. 10. 1.2...Pulley, 3...Belt, 8...Link, 9...Block, 10...Spring. Representative Patent Attorney Takashi Okabe (11) 1-\, 376 Figure 10-377-

Claims (3)

[Claims] (1) A flexible and non-stretchable endless annular ring and a large number of blocks successively attached to this ring;
A power transmission belt comprising the block and a coil spring surrounding the ring. (2) The power transmission belt according to claim 1, wherein the block is made of a composite material of carbon IA fiber or glass fiber and metal/resin or ceramics, or made of a single ceramic. (3) 1) The power transmission belt according to claim 1, wherein the ring described in item II is made of an elastic body formed by fitting carbon fibers, glass fibers, or Kevlar fibers into an endless band shape.