JPH0527390U - High load transmission belt - Google Patents

Abstract

(57) [Abstract] [Purpose] To prevent the abrasion of the surface of the block body and improve the life of the belt. A head 8 is formed on a main body 6 of a block body 2 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 provided in a state of having a gap or mutually. A high-load transmission belt in which the endless band 3 is hung through the slots 9 in a closely contacted state, and the projection 15 is provided on the surface of the block and the groove 22 is provided at the same position on the back surface thereof. Yes, the block body 2
The surface is subjected to a diffusion coating treatment with a metal element so that the surface hardness of Vickers hardness (HV) is 1,000 or more.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 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]

 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 a detailed document.

This transmission system generally has a structure in which the block body is not fixed to the endless band but is slidably arranged on the endless band, and when it is applied to 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 on the drive pulley to rotate the driven pulley.

[0004]

[Problems to be solved by the device]

 When the belt travels around the drive pulley and the driven pulley, the block body falls down with respect to the inclination start line provided on the main body. In particular, when the driven pulley is rotated, the block body is pushed forward while tilting with respect to the inclination start line, so that the wear around the inclination start line of the block body and the projections and grooves is severe, and the endless band circumference is countered. As a result, the interval between the block bodies becomes large, and it is difficult for the protrusions provided on each block body to be accommodated in the adjacent guide grooves. The present invention solves such a problem, and has found that one of the causes of the problem is wear of the surface of the block body. By preventing this, it is possible to improve the life of the belt. To aim.

[0005]

[Means for Solving the Problems]

 A feature of the present invention is that 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 have a gap or are in close contact with each other. In the high load transmission belt, the endless band is hooked through the slots of the block body, and the protrusion is provided on the surface of the block and the groove is provided at the same position on the back surface of the block. The point is that the surface of the body was diffusion-coated with a metal element so that the body had a Vickers hardness (HV) of 1,000 or more.

[0006]

[Action]

 In the high load transmission belt of the present invention, since the surface of the block body is diffusion-coated with a metal element so that the surface hardness of the block body is 1,000 or more in Vickers hardness (HV), the slopes where the block bodies strongly contact each other are inclined. Wear around the start line and at the protrusions and the grooves is reduced, and the fitting between the protrusions and the grooves provided on each block is maintained for a long time.

[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 FIG. 1 is configured by arranging a plurality of block bodies 2 slidably on 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.

As shown in FIG. 2, each block body 2 used here has a main body 6 having a slanted end surface 5 that abuts against a V-pulley wall surface 4, a pillar 7 located substantially at the center, and a chevron shape. Head 8 and a pair of slot portions 9 for hanging the endless band 3. The slot 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. The lubricating oil supplied from below the block in the vicinity of the driven pulley is stored in the space surrounded by the endless band 3 and the lower notches 17 at both corners of the pillar to form an oil reservoir. While moving between the side wall 17 of the pillar and the end surface 19 of the endless band to the upper cutout portion 13, and passing through the oil groove 16 opened by the centrifugal force to lubricate the head 8, It is accumulated in the through hole 12. By passing through the oil groove 16 provided in the head top portion 14 from the through hole 12 and flowing out to the outside of the block body 2 while also lubricating this periphery, the lubricating function is effectively exhibited.

The front surface of the main body 6 has a tapered surface 20 whose thickness gradually decreases downward, and an inclined start line 21 at the start position of the tapered surface is the same line as the shoulder surface 10 of the slot 9. Located on top. Generally, the tapered surface 20 enables the block body 2 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 block body 2 rotates on the pulley. That is, the slope start line 21 where the thickness of the body starts to decrease.

Further, the pillar 7 of the block body 2 is provided with the projection 15 and the groove 22 on the back surface at the same position. With the block body 2 having the projection 15 and the groove 22 at this position, even if the block body enters the pulley and inclines and is displaced to the minimum pulley diameter, these coupling relationships are always maintained. Even when the block body 2 is separated from the pulley, this coupling state does not change. The positions of the protrusion 15 and the groove 22 may be on the tilt start line 21 of the pillar 7 or in the vicinity thereof.

The surface of the block body 2 is diffusion-coated with a metal element so that the surface hardness has a Vickers hardness (HV) of 1,000 or more. This diffusion coating treatment is a method of permeating and diffusing the metal element from the surface of the block body 2 to the inside so that a large amount of the metal element is contained in the surface layer. The metal elements used include Cr, Si, B, Al, Mo, W, Zn, V, Be, Ti, Ta, etc., but Cr, B, Mo are preferable from the viewpoint of wear resistance and toughness.

On the other hand, other methods for increasing the surface hardness include nitriding, carburizing, PVD method for coating TiN 3, TiC, TiCN, etc., and CVD method, but nitriding has a surface hardness of HV1, It does not exceed 000 and is inferior in abrasion resistance. Further, although carburization increases the surface hardness, it has a problem in toughness. Furthermore, since the PVD method or the CVD method coats the metal surface, the thickness of the block body increases by the amount of the coating, which causes a problem in fitting with the protruding portion 15 and the groove portion 22 of the block body 2.

Next, the high load transmission belt according to the present invention was subjected to a running tester to examine the life and failure phenomena of the belt. First, a block body having a shape shown in FIG. 1 and made of a steel material with a thickness of 2.2 mm, a contact angle with a pulley of 22 °, and a pitch line width of 24 mm was molded with a mold, and then the block body was subjected to the conditions shown in Table 1. Surface treatment was performed. A belt was assembled using this block body and an endless band composed of 6 layers of steel bands having a total thickness of about 1.5 mm. This belt was attached to the transmission case of a 1200 cc vehicle, the vehicle was placed on the chassis dynamo, and the belt was run in a vehicle speed pattern that repeated up and down three times in 6 minutes to evaluate the durability of the belt. The maximum vehicle speed is 140 km / hr and the minimum vehicle speed is 0 km / hr.

[0015]

[Table 1]

The results are shown in Table 2, and the belt having the block body subjected to the diffusion treatment with boron showed the best result.

[0017]

[Effect of the device]

 As described above, in the high load transmission belt of the present invention, since the surface of the block body is diffusion-coated with a metal element so that the surface hardness of the block body is 1,000 or more in Vickers hardness (HV), the block bodies are different from each other. The wear around the slope start line, where strong pressure contact is made, as well as the protrusions and grooves, is reduced, the protrusions provided on each block and the adjacent grooves are kept fitted for a long time, and the belt life is extended.

[Table 2]

[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 view of FIG. 1 viewed from the back side.

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

[Explanation of symbols]

 2 Block body 3 Endless band 6 Main body 7 Pillar 8 Head 10 Shoulder surface 12 Through hole 15 Projection 16 Oil groove 20 Tapered surface 21 Inclination start line 22 Groove

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Fumio Yamashita 4-1-21, Hamazoe-dori, Nagata-ku, Kobe Mitsuboshi Belt 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 hooked through the slot portion and a protrusion is provided on the surface of the block and a groove is provided at the same position on the back surface thereof, the surface hardness of the block is determined by Vickers hardness. A belt for high load transmission, the surface of which is diffusion-coated with a metal element so that the belt has (HV) of 1,000 or more.