JPH0519703U - High load transmission belt - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent the endless band from premature fatigue and improve the belt life. A head 8 is formed on a main body 6 of a block body via a pillar 7, and a plurality of block bodies 2 each having a slot portion 9 between the main body 6 and the head 8 are in a state of having a gap or closely contacting each other. The belt is a high-load transmission belt in which the endless band 3 is hung through the slot portions 9 of the block bodies 2 arranged side by side, and the surface roughness in the flat regions of the front surface and the rear surface of each block body 2 is 0.04 mm or less. .

Description

[Detailed description of the device]

[0001]

[Industrial application]

 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 transmission devices.

[0002]

[Prior Art]

 The push transmission system generally has a structure in which the block body is not fixed to the band but is slidably arranged on the band. It is possible to rotate the driven pulley by pressing the block bodies that gather on the loose side of the belt from the block bodies that gather and drive. Therefore, in order to regularly introduce the block body into the pulley, a means for regulating and aligning the position of each block body is required. As this method, the protrusions provided on the front surface of each block body are housed in the guide grooves provided on the back surface of the adjacent block body to perform self-alignment.

[0003]

[Problems to be solved by the device]

 In particular, each block body is pushed out of the drive pulley and abuts on the front block body to transmit power, but if the surface roughness of the contact portion of the block body is large, it is difficult to transmit power linearly. , A component force acts to push each block body upward. This gives unnecessary tension to the endless band, causing fatigue of the endless band and early cutting.

Further, each block body rotating on the pulley is inclined in a direction separating from the rear block body according to a winding radius (curvature) around the pulley, but the surface of the contact portion of the block body is inclined. When the surface roughness is large, the block body does not incline above a certain curvature, and the interference between the projection provided on the block body and the guide groove cannot be avoided. The present invention solves such problems, and an object thereof is to prevent early fatigue of the endless band and improve the life of the belt.

[0005]

[Means for Solving the Problems]

 A high load transmission belt, which is a feature of the present invention, has a head 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 have gaps. It is a belt that is placed in parallel with each other or in close contact with each other, and an endless band is hung through the slot part, and the surface roughness in the flat area on the front and rear surfaces of each block is 0.04 mm or less. It is in.

[0006]

[Action]

 In the high load transmission belt of the present invention, if the surface roughness of the front and rear flat areas of each block body is 0.04 mm or less, the block body pushed from the back tends to move linearly. However, since the endless band is not subjected to unnecessary upward tension, the cause of premature fatigue of this band is eliminated and the belt life is improved.

[0007]

【Example】

 Embodiments of the present invention will be described below with reference to the accompanying drawings. The high load transmission belt 1 shown in FIGS. 1 to 4 is configured by slidably arranging a plurality of block bodies 2, an endless band 3, for example, a multi-layer steel band. Of course, the block bodies 2 may be arranged in close contact with each other to apply pretension to the endless band 3.

Each block body 2 used here has a main body 6 having an inclined end surface 5 that abuts against a V-pulley wall surface 4, a pillar 7 located substantially in the center, a chevron-shaped head 8, and an endless band 3. And a pair of slot portions 9 for hanging. The slot portion 9 has a shoulder surface 10 for carrying 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, and a penetrating hole is provided between the through hole 12 and the R-shaped upper notch portion 13. An oil groove 16 is arranged between the hole 12 and the head top 14 and between the through hole 12 and the protrusion 15.

Lubricating oil supplied from below the block body in the vicinity of the driven pulley is stored in a space surrounded by the endless band 3 and the lower cutouts 17 at both corners of the pillar to form an oil sump, From this portion, it moves to the upper notch 13 via the side wall 17 of the pillar and the end surface 19 of the endless band, and the head 8 is lubricated by centrifugal force while passing through the oil groove 16 opened in the vicinity thereof. While being accumulated in the through hole 12. Then, the oil passes through the oil groove 16 provided in the head top portion 14 through the through hole 12 and flows out of the block body 2 while lubricating the surrounding area, so that the lubricating function is effectively exhibited.

In this embodiment, the through hole 12 provided in the head 8 has a diameter of 2 to 3 mm, the oil groove 16 has a width of 0.4 to 0.8 mm and a depth of 0.2 to 0.4 mm. This degree is optimal in terms of lubrication performance and block strength, and it becomes possible to retain the lubricating oil in the through hole 12 and supply it to the normal oil groove 16. The path of the oil groove 16 may be lengthened in order to lubricate the head 8 in a relatively wide range.

In this embodiment, the front surface of the main body 6 has a tapered surface 20 whose thickness decreases downward, and an inclination start line 21 that is the starting position of the tapered surface is located inside the main body 6. It In this embodiment, the pillars 7 of the block body 2 are provided with the projections 15 and the grooves 22 on the back surface at the same positions. With the block body 2 having the protrusions 15 and the groove portions 22, even if the block body enters the pulley and inclines and is displaced to the minimum pulley diameter, these coupling relationships are always maintained and Even when the body 2 is separated from the pulley, this connection state does not change. The positions of the protrusion 15 and the groove 22 are not limited to the pillar 7.

In the present invention, the predetermined surface of the block body 2 is polished so that the surface roughness of the main body 6, the pillar 7 or the head 8 which is a flat area on the front and rear surfaces of the block body 2 is 0.04 mm or less. The surface is machined. This surface roughness is measured with a three-dimensional measuring device. Here, as shown in FIG. 5, a reference position C is provided in the flat area of the block body, and from this position, the height L1 of the top of the protrusion and the recess It means the difference (L1-L2) from the depth L2 of the deepest groove bottom, and the difference is 0.04 mm at the maximum.

When the surface roughness exceeds 0.04 mm, the front block body 2 does not move linearly due to the component force of being pushed upward by the rear block body 2 and does not move to the endless band 3. This is because a strong upward tension is applied, and the endless band 3 is fatigued and cut early.

Next, a high load transmission belt according to the present invention was prototyped, and this was subjected to a running test to investigate the belt life and cause of failure. First, after molding a block body with a thickness of 2.2 mm, an angle of 22 ° and a pitch line width of 24 mm with a mold, the surface roughness in the flat area consisting of the main body, pillars, and head is about 0.10 mm, 0.05 mm, 0. The surface was polished to 0.02 mm, and a belt was produced using this block body and an endless band composed of 6 layers of steel bands. This belt was attached to the transmission case of a 1200 cc vehicle, the vehicle was placed on a chassis dynamo, and the durability of the belt was evaluated by a vehicle speed pattern in which it was repeatedly up and down three times in 6 minutes. The maximum vehicle speed is 140 km / hr and the minimum vehicle speed is 0 km / hr. The results are shown in Table 1, and the belt having a surface roughness of 0.02 mm showed the longest life.

[0016]

[Table 1]

As described above, it is understood that the durability of the belt is improved by reducing the surface roughness in the flat region of the main body of the block body, the pillar, or the head.

[0018]

[Effect of the device]

 As described above, in the high load transmission belt of the present invention, if the surface roughness of the flat area where the block bodies contact each other is 0.04 mm or less, the block bodies collide linearly and endlessly. There is an effect that the durability of the band is further improved without giving unnecessary force to the band.

[Brief description of drawings]

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

FIG. 2 is a diagram of FIG. 1 viewed from the back side.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a side view of FIG.

FIG. 5 is a diagram showing a state of surface roughness in a flat region of a block body.

[Explanation of symbols]

 1 High load transmission belt 2 Block body 3 Endless band 6 Main body 7 Pillar 8 Head

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Takashi Masuda, 4-1-21, Hamazoe-dori, Nagata-ku, Kobe-shi Mitsuboshi Belting Co., Ltd. (72) Kouji Kunihiro 4-1-21, Hamazoe-dori, Nagata-ku, Kobe Mitsuboshi Belting Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A head is formed on a main body of a block body through a pillar, and a plurality of block bodies having 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 a high-load transmission belt in which an endless band is hung through its slot, the surface roughness in the flat regions of the front and rear surfaces of each block is 0.04 mm or less, for high-load transmission. belt.