JPH0215067Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention is a noise-prevention roller chain that reduces the noise generated when the chain meshes with a sprocket, and is particularly suitable for use in motorcycle drive chains. Regarding prevention roller chain.

(B) Prior art In general, roller chains are based on the fact that when the rollers of the chain mesh with the teeth of a sprocket, the rollers collide with the teeth at a certain speed. A metal-to-metal collision occurs between the rollers and the bushing, which causes the roller to vibrate elastically and the fluid between the roller and the bush to move quickly to one side, causing the fluid in that area to move rapidly. In addition, noise is generated due to the discharge.

Therefore, as shown in Japanese Utility Model Application No. 55-147553, an elastic ring with a circular cross section is interposed between the roller body and the roller link plate, and when the chain meshes with the sprocket, the elastic ring is first inserted. A noise prevention roller chain has been devised that abuts against the teeth of a sprocket and reduces noise generation by elastic deformation of the ring.

(c) Problems that the invention aims to solve By the way, the tips of the sprocket teeth are generally tapered to better accept the chain, and as the chain stretches, etc., the rollers start to mesh with the sprocket teeth. In many cases, the teeth do not come into contact with both ends of the rollers, but since the elastic ring of the above-mentioned noise prevention roller chain has a circular cross section, its protruding top is located on the link plate side, and the sprocket is attached to the ring at the start of engagement. The teeth may not collide, and the noise prevention effect is extremely low. Furthermore, even when the elastic ring comes into contact with the tooth, the roller chain is fitted with the elastic ring in a restrained state, so the elastic ring cannot freely rotate with respect to the bush, and therefore, the elastic ring cannot rotate freely relative to the bush. The elastic ring always collides with the sprocket at the same location, causing local wear and fatigue, and there is a risk that it will break relatively early. Furthermore, since the elastic ring has a circular cross section, when the sprocket first contacts the elastic ring, it is a point contact, and the point contact is located on the link plate side.
The teeth often come into contact with only one of the elastic rings, which is extremely unstable, causing the chain to tilt and its link plate to come into contact with the side of the sprocket, reducing the noise prevention effect. In addition, a ring with a circular cross section has a small cross-sectional area of the part that protrudes from the roller, so the noise absorption energy caused by crushing the protruding part is small, and the noise prevention effect is small, and it is difficult to produce a large noise effect. requires increasing the cross-sectional diameter of the ring, but in this case, there is a constraint on the chain width, so
The metal roller portion becomes small, resulting in a configuration that is extremely disadvantageous in terms of strength. Furthermore, the area where the left and right sides of the elastic ring with a circular cross section contact the roller body and the link plate is extremely small, and due to the engagement of the sprocket, an extremely large surface pressure acts between the roller body and the link plate, resulting in a reduction in elasticity. This causes a decrease in the durability of the ring.

(d) Means for solving the problem The present invention aims to solve the above-mentioned problems, and for example, as shown in Figure 1,
An elastic ring 9 is rotatably disposed on the bush 6 between the roller body 7 and the roller link plate 5, and the cross section of the elastic ring 9 is approximately rectangular. Furthermore, when the roller chain engages with the sprocket, the elastic ring contacts the sprocket first.
The outer diameter of the elastic ring 9 is configured to be larger than the outer diameter of the roller body 7, and the axial length a of the elastic ring is set to be approximately the same as or longer than the axial length b of the roller body. It is characterized by the fact that

(E) Effect Based on the above-described structure, when the roller chain 1 meshes with the sprocket, the elastic rings 9 located on both sides of the roller body 7 first collide with the sprocket teeth with their flat outer peripheral surfaces, and then The roller body 7 comes into contact with it. At this time, even if the sprocket teeth have a tapered shape, the elastic ring 9 having a rectangular cross section and a predetermined thickness and width always collides with the sprocket teeth, and due to the deformation of the elastic ring 9 having a large cross sectional area. In addition, the elastic rings 9 made of flat surfaces contact both sides of the sprocket teeth to prevent the chain from tilting, and the roller body is seated on the bottom of the sprocket teeth in the parallel state. and carry the power transmission load. Furthermore, when the chain 1 enters and leaves the sprocket, the elastic ring 9 rotates with respect to the bush 6, and the position where the elastic ring 9 contacts the sprocket teeth changes sequentially.

(F) Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

As shown in FIG. 1, the noise prevention roller chain 1 consists of pin links and roller links like a general roller chain. That is, a pin link in which both ends of the pin link plates 2, 2 are connected and fixed by pins 3, and both ends of roller link plates 5, 5 are connected and fixed by bushes 6, and rollers 7 are loosely attached to the bushes 6. It consists of fitted roller links, and these links are alternately connected by fitting and inserting pins 3 into bushes 6 to form an endless structure. The roller 7 is composed of a narrow roller body, and an elastic ring having a substantially rectangular cross section and made of an elastic material such as rubber or plastic is located between both ends of the roller body 7 and the roller link plate 5. 9 is rotatably fitted into the bush 6. The thickness of the elastic ring 9 is set to be thicker than that of the roller body 7, and its outer diameter is larger than the outer diameter of the roller body 7, and its inner diameter is also equal to the inner diameter of the roller body 7. Therefore, when the roller chain 1 is engaged with the sprocket 10, after the elastic ring 9 collides with the sprocket 10, the ring 9 is elastically deformed and the roller body 7 comes into contact with the sprocket. It becomes like this. Elastic rings 9 located on both sides of the roller body 7
As shown in FIG. When the chain 1 meshes with the sprocket 10, even if the sprocket teeth 10a have a tapered shape, the elastic ring 9 has a width that ensures reliable contact with the teeth 10a, and a width and thickness that sufficiently serves as a buffer material. In addition, the roller body 7 also has a width sufficient to carry the load. In addition, in Figures 2 and 3, D is the bottom of the sprocket tooth, and S
is the tooth surface.

Since this embodiment has the above-described configuration, as the sprocket 10 rotates in the direction of the arrow A, the rollers 7 of the roller chain 1 sequentially move against the sprocket teeth 1.
0a and power is transmitted. At this time, the roller 7 tries to collide with the bottom D or the tooth surface S of the sprocket tooth 10a at a predetermined speed as shown by the arrow B in FIG.
Before the abutment, the elastic ring 9 touches the sprocket teeth 10.
After the elastic ring 9 deforms and absorbs the energy accompanying the collision with the bush 6,
The roller body 7 is seated on the sprocket teeth 10a and receives the load associated with power transmission. Since the elastic ring 9 rolls in contact with the sprocket teeth 10a and its outer diameter is larger than the outer diameter of the roller body 7, the ring 9 does not undergo elastic deformation on the side opposite to the load side, that is, in the direction of the sprocket outer diameter. Therefore, as the engagement progresses as the sprocket 10 rotates, the elastically deformed portion of the ring 9 on the load side is pushed out and peristals toward the non-deformed side, and the next time the roller 7 collides with the sprocket tooth 10a, elastic ring 9
collides at a different portion from the current collision portion, thereby preventing the elastic ring 9 from becoming sagging due to repeated deformation at the same location.

When the chain 1 enters the sprocket 10, the elastic rings 9, 9 located on both sides of the roller body 7 come into contact with the tapered sprocket teeth 10a with their flat outer peripheral surfaces, and both elastic rings 9, The roller body 7 is seated on the bottom D of the sprocket with the chain 1 kept parallel while the chain 9 is deformed. Furthermore, the elastic ring 9 has a large rectangular cross-sectional area in the portion that protrudes from the roller body 7, and has a large noise energy absorption capacity, and the elastic ring 9 is prevented from being lateralized by collision with the sprocket teeth 10a. Even if it expands in the direction, both linear side surfaces press against the flat surfaces of the roller body 7 and the link plate 5, so that the contact area is large and the pressing surface pressure is small. Further, the steel roller body 7 located in the center portion is seated parallel to the sprocket tooth bottom D, and carries a sufficient transmission load.

In addition, in the above-mentioned embodiment, the roller body 7 made of steel is used.
Although the roller body 7 is loosely engaged with the bush 6 and supported rotatably, the roller body 7 may be press-fitted into the bush 6 and fitted in a non-rotatable manner, as shown in FIG. Thereby, destruction and early wear of the roller body 7 can be prevented.

(g) Effect of the invention As explained above, according to the invention, the elastic rings 9, 9 are located between the roller body 7 and the roller link plate 5, have a substantially rectangular cross section, and have a predetermined shape. Sprocket tooth 1
Even if 0a has a tapered shape, both rings 9,
9 may collide with the sprocket tooth 10a, and the generation of noise caused by the direct collision between the sprocket tooth 10a and the roller body 7 can be reliably prevented, and the flat surfaces of both the left and right rings 9 abut against the sprocket tooth 10a, causing the chain 1 to It is supported in parallel without tilting, and it is possible to prevent the generation of noise caused by the link plate 5 coming into contact with the side surface of the sprocket, and also to prevent the generation of noise caused by the roller body 7 and the roller link plate 5 colliding with each other. Therefore, it is possible to reliably prevent the generation of noise due to direct collision between metals. Further, the elastic rings 9, 9 located between the roller body 7 and the roller link plate 5 also serve as oil seals, and seal lubricating oil between the roller body 7 and the roller link plate 5, thereby sealing the parts between the roller body 7 and the elastic rings 9. In addition to preventing wear, it also prevents fluid from rapidly moving and being discharged from the gap between the bush and the roller, thereby preventing the generation of noise. Further, the cross-sectional area of the portion of the elastic ring 9 that protrudes from the roller body 7 is also rectangular and has a large area, and its noise energy absorption capacity is large. In addition to exhibiting an extremely large noise prevention effect, the area of the protruding portion can be changed without changing the width of the ring 9, and can be freely set without impairing the strength of the chain.
Further, since the elastic ring 9 having a rectangular cross section has both linear side surfaces in contact with the linear side surfaces of the roller body 7 and the roller link plate 5, the elastic ring 9 expands laterally due to the engagement of the sprocket. However, by contacting with a large contact area, reducing the surface pressure, and rotating the elastic ring 9, the contact point with the sprocket tooth 10a changes sequentially, and the durability decreases due to wear of the elastic ring 9, etc. can be prevented.

On the other hand, after the collision energy is absorbed by the elastic rings 9, the roller body 7 seats on the sprocket tooth bottom D in a parallel state, and is located at the center and has a predetermined width. The power transmission load acts almost uniformly as a static load without any impact, and even though the elastic ring 9 is interposed, sufficient power performance and durability can be maintained.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a roller chain showing an embodiment of the present invention, FIG. 2 is a vertical cross-sectional view showing the meshing state of the roller chain, and FIG. 3 is a cross-sectional view thereof.
FIG. 4 is a cross-sectional view showing a roller chain according to another embodiment. 1... Noise prevention roller chain, 2... Pin link plate, 3... Pin, 5... Roller link plate, 6... Bush, 7... Roller body, 9
...Elastic ring, 10...Sprocket, 10a
... Sprocket tooth, a... Axial length (width) of elastic ring, b... Axial length (width) of roller body.

Claims (1)

[Claim for Utility Model Registration] A pin link in which both ends of a pin link plate are connected and fixed with pins, and both ends of a roller link plate are connected and fixed with bushes, and furthermore, a roller body and an elastic ring are arranged side by side on the bushes. In the noise prevention roller chain, the elastic ring connects the roller body to the roller link plate. It is arranged so that it can rotate freely in between.
and the elastic link has a substantially rectangular cross section,
Furthermore, the outer diameter of the elastic ring is configured to be larger than the outer diameter of the roller body so that the elastic ring comes into contact first when the roller chain engages with the sprocket. A noise prevention roller chain characterized in that it is configured to have a length that is approximately the same as or longer than the length in the direction.