JPH05209652A - High-load transmission belt - Google Patents

Abstract

PURPOSE:To change the collision cycle and reduce pitch noises by combining the first and second block bodies having different shapes so that the second block bodies are inserted between the first block bodies, and changing the shape and area of the pulley contact faces of the block bodies. CONSTITUTION:Multiple block bodies 2 are arranged slidably against an endless band 3, e.g. many steel bands, to form a high-load transmission belt 1, and the first and second block bodies 2A, 2B are arranged in turn to form the block bodies 2. The first block body 2A is provided with a main body 6 having a pulley contact face 5, a pillar 7 located nearly at the center section, a head 8 having a arch-shaped outer frame, and a pair of slot sections 9 to be hooked with the band 3, a taper face 20 gradually decreased in thickness downward and a weight reducing hole 25 are provided on both faces of the main body 6, and a cushioning material 35 is filled in it. The second block body 2B has nearly the same diameter as that of the first block body 2A, and all of them are formed in the same thickness.

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 belt, and more particularly to a high load transmission belt used in vehicles such as automobiles and various mechanical transmissions.

[0002]

2. Description of the Related Art Conventionally, power transmission systems for high load transmission belts are generally classified into two types: push transmission and tension transmission. Among them, the push transmission type is a structure in which a plurality of block bodies are attached to an endless multi-layer steel band in a state of being in contact with each other, and these block bodies are slidable, for example, US Pat. No. 3,720,113. It is disclosed in the specification and the like.

This transmission system generally has a structure in which the block body is not fixed to the endless band but slidably arranged on the endless band. When the block body is hung on both the driving and driven pulleys, The block bodies gather on the loose side of the belt, and the block bodies gathered on the loose side of the belt are pushed from the block bodies hanging on the drive pulley to rotate the driven pulley.

In such a block body, a trapezoidal main body having an end face that abuts on a pulley and a triangular head are connected via a pillar, and a slot portion is provided on the left and right of the pillar where endless bands are installed. It has become. The main body has a taper surface on the front surface, the thickness of which gradually decreases downward, and an inclination start line that is the start position of the taper surface is located slightly below the shoulder surface. Generally, the tapered surface allows the block body rotating on the pulley to be inclined in the traveling direction according to the curvature thereof.

[0005]

However, when such a block body enters a driving pulley or a driven pulley, the conventional block body has a uniform shape and weight, so that the block body collides with the pulley at a constant cycle. A sound was generated, which resonated to produce a strange noise, so-called pitch noise. Further, while the belt is running, in the push transmission section where the block body is moved from the drive pulley to the driven pulley, the block bodies come into contact with each other by the pillars and heads located above the inclination start line, and the whole block body receives high surface pressure. However, they have a drawback that the block bodies are easily worn because they vibrate slightly and slide between the contact surfaces. As a method to prevent this wear, it is conceivable to increase the area of the surface pressure part to reduce the surface pressure per unit area, but the increased area of the block body increases the weight and reduces the power transmission capacity of the belt. did.

The present invention addresses such a problem and improves the problem. Particularly, when the block body to be arrayed has been devised, it occurs when the block body enters and abuts on the driving pulley or the driven pulley. It reduces the pitch noise, the collision noise when the blocks come into contact with each other, and the wear on the contact surface due to the microvibration of each block. Furthermore, the weight of each block is reduced and unnecessary tension is given to the endless band. The purpose is to extend the life of the belt.

[0007]

A feature of the present invention is that a plurality of block bodies are formed by forming a head on a main body of the block body through a pillar and providing a slot portion between the main body and the head. In a high-load transmission belt in which endless bands are hung through the slots of the high-load transmission belts that are arranged in parallel with each other with a gap or in close contact with each other, the first block body having a bilaterally symmetrical shape is provided on both sides of the main body. A tapered surface whose thickness gradually decreases is provided, and at least one weight reduction hole is formed in an area defined by the inclined start line that is the starting position of the tapered surface and the left and right pulley contact surfaces and the bottom surface. The hole is filled with a cushioning material and fixed, the through hole is also provided in the head, and the second block body having a symmetrical shape has a tapered surface. The second block body has a uniform thickness, at least one weight reducing hole is provided in the main body, a cushioning material is filled in the hole to fix the hole, and a through hole is provided in the head. The structure is interposed between the block bodies. The present invention also includes the case where the centers of gravity of the first block body and the second block body are installed at positions separated by the same distance from the shoulder surface of each slot portion.

[0008]

In the high load transmission belt of the present invention, the first block body and the second block body are combined so that the second block body is interposed between the first block body and the first block body. A tapered surface whose thickness gradually decreases downward is provided on both sides of the main body of the block body, and the second block body has a constant thickness without a tapered surface. Pitch noise is reduced by changing the area and changing the collision period when each block body enters and abuts the pulley.

Moreover, since at least one weight reducing hole is provided in the main body of the first block body and the second block body, the tension applied to the endless band at the time of high speed rotation of the belt is reduced and the life thereof is reduced. Can be extended.

Further, since the cushioning material is filled and fixed in at least one weight reducing hole provided in the main body, the cushioning material having a relatively large loss coefficient causes a slight vibration generated when the block bodies collide with each other. Absorbs and greatly reduces wear of the high surface pressure portion of the block body.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings. The high load transmission belt 1 shown in FIG. 1 is a main part of the belt according to the present invention, and includes a plurality of block bodies 2.
Are slidably arranged on the endless band 3, for example, a multi-layer steel band.
In this case, the block bodies 2 may be arranged in close contact with each other to apply pretension to the laminated band 3. In the block body 2 used here, the first block body 2A and the second block body 2B are alternately arranged.

As shown in FIG. 2, the first block body 2A has a symmetrical shape, a main body 6 having a pulley abutment surface 5 for engaging the V pulley wall surface 4, and a pillar located substantially at the center. 7, a head 8 having an arch-shaped outer frame, and a pair of slot portions 9 for hanging the endless band 3. The slot 9 has a shoulder surface 10 that carries the endless band 3.

Further, a through hole 12 having a circular shape, an elliptical shape, a rectangular shape, a square shape, or the like is provided at a substantially central portion of the block body head 8. Between the through hole 12 and the R-shaped upper cutout portion 13, Between the through hole 12 and the head top portion 14 and the through hole 1
An oil groove 16 is arranged between the 2 and the protrusion 15. Therefore, the lubricating oil supplied from below the block body near the driven pulley is stored in the space surrounded by the laminated band 3 and the lower cutout portions 17 at both corners of the pillar to form an oil reservoir. Through the side wall 18 of the pillar and the end face 19 of the laminated band to the upper cutout portion 13, and passes through the oil groove 16 opened in the vicinity thereof by centrifugal force while lubricating the head 8 and penetrates it. Accumulated in the hole 12. By passing through the oil groove 16 provided in the head top portion 14 from the through hole 12, the peripheral portion is also lubricated and flows out to the outside of the block body 2A, so that the lubricating function is effectively exhibited.

The tip of the lower cutout portion 17 may be located below the slope start line 21 which is the start position of the tapered surface whose thickness gradually decreases downward, and the lubricating oil It is designed to be taken into the notch. This lubricates between the endless band 3 and the shoulder surface 10,
Wear and heat are suppressed to improve the durability of the endless band 3.

In this embodiment, the through hole 12 provided in the head 8 is used.
Has a diameter of 2 to 3 mm, and the oil groove 16 has a width of 0.4 to 0.8.
mm, and the depth is 0.2 to 0.4 mm, and this degree is optimal from the viewpoint of lubricating performance and the strength of the block body, and the lubricating oil can be held in the through hole 12 and supplied to the normal oil groove 16. It will be possible. The path of the oil groove 16 may be lengthened in order to lubricate the head 8 in a relatively wide range.

Further, as shown in FIG. 3, the first block body 2A has a protrusion 15 arranged on one surface of the pillar 7,
Further, on the other surface of the pillar 7, a groove portion 22 for accommodating the protrusion 15 provided on the pillar 7 of the second block body 2B is arranged.

On the other hand, the front surface and the rear surface of the main body 6 have a tapered surface 20 whose thickness gradually decreases downward, and an inclined start line 21 which is the starting position of the tapered surface has a shoulder surface of the slot portion 9. It is located below 10.
In general, the tapered surface 20 enables a block body rotating on the pulley to be inclined in the traveling direction according to the curvature thereof, and the belt pitch line becomes a line when the first block body 2A rotates on the pulley. , The slope start line 21 where the thickness of the main body starts to decrease.

In the body 6, the body area 24 defined by the linear bottom surface 23, the left and right pulley contact surfaces 5, 5 and the inclination start line 21 is set to have a relatively large area. In this body region 24, one trapezoidal cut-out weight reducing hole 25 is provided. Even if such a weight reducing hole 25 is provided, the bottom surface portion 27 is linearly bridged, and the structure is sufficiently resistant to the compressive force received from the pulley. Therefore, the block body 2 of the present invention
In A, the area of the head 8 area is 1 compared to the conventional one.
Then, the area of the body region 24 is 2 to 5 times larger. If it is outside this range, it is difficult to place the center of gravity 26 of the block body below the inclination start line 21.

FIG. 5 shows another embodiment of the block body 2A according to the present invention, in which a main body region 24 defined by an inclined start line 21, left and right pulley contact surfaces 5, 5 and a linear bottom surface 23 is formed. Are three weight reduction holes 25 cut out in a circle.
Is provided to reduce the weight of the block body 2A, and the bottom body 27 of the block body 6 is linearly bridged by this, so that the block body 6 is sufficiently resistant to the compressive force received from the pulleys. The weight reducing hole 25 is not limited to the circular shape and may be a triangular shape.

The cushioning material 35 is filled and fixed in the weight reducing hole 25 to absorb the minute vibration generated when the block bodies collide with each other, and to greatly wear the high surface pressure portion of the block body. Reduce. The cushioning material 35 has a relatively large loss coefficient, and is made of, for example, a rubber elastic body such as nitrile rubber, chloroprene rubber, hydrogenated nitrile rubber, urethane, ultrahigh molecular weight polyethylene, polytetrafluoroethylene, polyimide, epoxy, or the like. Synthetic resin or metallic material that is more flexible than the block body, such as Ti-50% N
i-based alloy, Fe-50% Co-based alloy, Fe (10-20
%) Cr-based alloys, Cu-40% MnO-based alloys and the like.

Next, the second block body 2 used in the present invention
B has a symmetrical shape as shown in FIGS. 6 to 7, and the front surface and the back surface of the main body 6 do not have a tapered surface whose thickness gradually decreases downward, and the head 8 to the main body 6 have a constant shape. The thickness of the first block body 2A in this respect
Is different from. The main body 6 has a linear bottom surface 23 and has two trapezoidal weight reduction holes 25,
The cushioning material 35 is filled and fixed therein.

Further, the second block body 2B is provided with a through hole 12 having a circular shape, an elliptical shape, a rectangular shape, a square shape or the like at the substantially central portion thereof similarly to the head 8 of the first block body 2A. An oil groove 16 is arranged between the hole 12 and the R-shaped upper notch 13, between the through hole 12 and the head top 14, and between the through hole 12 and the protrusion 15. Pillar 7
The protrusion 15 is arranged on one surface, and the groove 22 for accommodating the protrusion 15 provided on the pillar 7 of the first block body 2A is arranged on the other surface of the pillar 7.

The center of gravity position 26 of the first block body 2A and the second block body 2B in the present invention is located at the same distance from the shoulder surface 10 and is 0.5 mm above and below the shoulder surface 10. It is within 2.0 mm. If the position of the center of gravity of each block body is different within the range of the center of gravity position, the action point of pushing out the block body is also different, the directionality of the pushing force is lost, the block body is easily damaged, and the endless band 3 is cut. Will be done.

When the position of the center of gravity of each block exceeds 0.5 mm above the shoulder surface 10, the energy for the rear block to push the front block increases, but it tends to tilt forward and backward with respect to the traveling direction. Nari, endless band 3
Are rubbed by the edge of the slot portion 9 and the innermost side surface or the outermost side surface of the endless band 3 is easily damaged.

On the other hand, when the position of the center of gravity exceeds 2.0 mm below the shoulder surface 10, the endless band 3 is inserted into the slot portion 9.
Although it is less likely to be rubbed at the edge of the belt, the energy for the rear block body to push the front block body is reduced and the transmission efficiency of the belt is reduced. Therefore, in order to smoothly slide each block body on the endless band 3 in an upright and stable state and increase the energy to push the block body in front, the upper 0.5 mm and the lower 2.0 mm are required. Is.

The first block body 2A and the second block body 2B are formed by heat-treating steel or steel, by diffusing and permeating boron on the surface thereof, or chemically by using titanium nitride, titanium carbide or the like. Alternatively, it may be physically evaporated, or ceramics such as alumina may be bonded to the surface.

[0027]

As described above, in the high load transmission belt of the present invention, the first block body and the second block body having different shapes are provided between the second block body and the first block body. Pitch noise is reduced because the shape and area of the pulley contact surface of each block body is changed by interposing them in an intervening manner so that the collision cycle when each block body enters and contacts the pulley is changed. .. Moreover, since at least one weight reducing hole is provided in the main bodies of the first block body and the second block body, it is possible to reduce the tension applied to the endless band at the time of high speed rotation of the belt and extend its life. You can In addition, since the cushioning material is filled and fixed in at least one weight reducing hole provided in the main body, the cushioning material having a relatively large loss coefficient can reduce collision noise and slight vibration generated when the block bodies collide with each other. Absorbs and greatly reduces wear of the high surface pressure portion of the block body.

[Brief description of drawings]

FIG. 1 is a partial side view of a high load transmission belt according to the present invention.

FIG. 2 is a front view of a first block body used in the high load transmission belt of the present invention.

FIG. 3 is a view of FIG. 2 viewed from the back side.

FIG. 4 is a side view of the first block body.

FIG. 5 is a front view of another first block body according to the present invention.

FIG. 6 is a front view of a second block body used in the high load transmission belt of the present invention.

FIG. 7 is a side view of FIG.

[Explanation of symbols]

 2 Block body 2A 1st block body 2B 1st block body 3 Endless band 6 Main body 7 Pillar 8 Head 10 Shoulder surface 12 Through hole 15 Projection part 20 Tapered surface 21 Inclination start line 25 Weight reduction hole 30 Projection part 31 Groove part 35 cushioning material

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yasutsugu Kunihiro 4-1-2-1, Hamazoe-dori, Nagata-ku, Kobe City Mitsusei Belt Co., Ltd. (72) Inventor Takashi Masuda 4-1-21, Hamazoe-dori, Nagata-ku, Kobe Mitsuboshi Belting Co., Ltd.

Claims (2)

[Claims] 1. A head is formed on a main body of a block body through a pillar, and a plurality of block bodies provided with a slot portion between the main body and the head are arranged in parallel with each other with a gap or in close contact with each other. In the high-load transmission belt in which the endless band is hung through the slot portion, the tapered surface of which the thickness gradually decreases on both surfaces of the main body is formed as the first block body having the symmetrical shape. At least one weight reduction hole is formed in the area defined by the inclined start line that is the start position of the tapered surface and the left and right pulley contact surfaces and the bottom surface, and a cushioning material is filled and fixed in this hole. At the same time, the head is also provided with through holes, and the second block body having a symmetrical shape has a constant thickness without a tapered surface, and at least one weight is attached to the main body. A volume reducing hole is provided, and a shock absorbing material is filled in the hole to fix the hole, and the head is provided with a through hole, and the second block body is interposed between the first block body and the second block body. Characteristic high load transmission belt. 2. The belt for high load transmission according to claim 1, wherein the center of gravity of the first block body and the center of gravity of the second block body are installed at the same distance from the shoulder surface of each slot.