JPH0214677Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" This invention relates to a clip-type chain joint that connects both ends of a series of long chains to form an endless chain.

``Prior Art'' Conventionally, the so-called clip type is typified by Utility Model Advertisement No. 15060 of 1930 and is well known, but this will be explained with Figures 3 to 5. , chains (hereinafter referred to as "chains" including roller chains and bushed chains)
It is called. )C is roller link plate 1,1
A roller link R is formed by the bushes 2, 2 and the rollers 3, 3, the bush 2 is connected to the roller link plate 1 by a tight fit, and the roller 3 is rotatably incorporated in the bush 2. The pin link P formed by pin link plates 4, 4 and pins 5, 5 and the roller link R are alternately connected to form a series of lengths, and the pin 5 and bush 2 constitute a bearing part. , the chain C is free to bend at the bearing part, and generally the pin link plate 4 and the pin 5 are said to be tightly fitted with an interference, and both ends of the pin 5 protruding from the pin link plate 4 are not fastened. Ru.
This serially connected chain C is connected at a joint J, so it is used for power transmission in automobiles, motorcycles, and general machinery.When repairing or replacing,
Partial case removal allows easy replacement with tools.

That is, two joint pins 7, 7 are fitted and attached to the lower plate 6 in an upright manner, and the upper plate 8 is loosely fitted to the holes H and H on one end side of the joint pin 7, and the outermost part The clip 9, which looks like a "grip scissors", is fitted into the groove 7' of the pin 7 to prevent the upper plate 8 from escaping outward.
and the bushing 2 in the chain C constitute a bearing part, the chain C is endless and annular, and each bearing part is bendable. However, when power is transmitted through chain C, chain C often moves, and the upper plate 8 is loosely fitted as described above, so it constantly vibrates and shakes due to the movement. Sometimes there are. This is well known in Japanese Utility Model Publication No. 54-31752, in which the main joint part J is attached to the connection of the seal chain, and the entire seal chain is connected to the roller link R.
It was found that when driven with a device connected by a pin link P, the noise was slightly higher in the device using the joint J, which also caused slight vibrations.

``Problems that the invention aims to solve'' In order to improve the service life of a chain, the bearings are the most important factor, but it is also possible to improve the strength of the joints, which are also part of the chain. is important. As described above, the purpose is to eliminate the wobbling caused by minute vibrations in the joint and to prevent fatigue failure of the upper plate resulting from the wobbling.

``Means for solving the problem'' At the ends of a chain with a series of lengths in which roller link plates and pin link plates are connected alternately, a clip is inserted at one end of the joint pin at the joint that connects both ends of the chain. Below the groove to be fitted, and
U located approximately in the center of the upper plate and forming a concave groove.
A letter-shaped housing is provided around the outer periphery of the joint pin, and an elastic body is fitted into the housing so that the elastic body is always in contact with the joint pin within the pin hole of the upper plate.

"Function" Since the elastic body according to the present invention is non-metallic and made of rubber like an O-ring, the upper plate and the joint pin do not come into direct contact with each other, so it serves to cancel out the resonance noise caused by metal contact. When in contact with the joint pin, it acts as a buffer, reducing noise and suppressing vibration.

``Example'' Next, an example will be described based on Figures 1 and 2.
A case in which the publication No. 16408 is applied to a well-known seal chain will be described in detail. Further, in FIGS. 3 to 5, the same reference numerals are used for the same items as those used in the conventional example.

First, in the first embodiment shown in FIG. 1, bushes 2, 2 are fitted and fixed to roller link plates 1, 1, and
The bush 2 has a roller link R with rotatable rollers 3, 3, and pin link P is formed by pin link plates 4, 4 and pins 5, 5, although omitted in the drawing.
The fact that roller links R and pin links P are alternately connected to form a chain C is no different from the conventional example. This bushing 2 slightly protrudes from the roller link plate 1, and an O-ring (there are X-rings, Y-rings, etc., but these are typically referred to as "O-rings") is fitted to the end of the protruding bushing 2, and the roller link R The chain C is sandwiched between the roller link plate 1 in the pin link P and the pin link plate 4 in the pin link P, and the crushing margin of the O-ring 10 is limited by the protruding bush 2.
It is said that In the joint part Ja, the joint pins 7, 7 are attached to the lower plate 6 and stand upright.
One side of the joint pin 7 is provided with a groove 7' into which a clip 9 can be inserted. Furthermore, below the groove 7' of the joint pin 7, at a position where the upper plate 8 is inserted, a U-shaped groove is formed, which is located approximately at the center of the upper plate 8 with respect to its thickness. A housing 7'' is provided, and an elastic body 11 such as an O-ring (it does not have to be a rubber O-ring, but may be made of leather or synthetic resin and has sealing performance) is fitted into the housing 7''. . The upper plate 8 is fitted onto the joint pin 7, and the outermost clip 9 is fitted into the groove 7' to prevent the upper plate 8 from coming off. The pin hole H and the joint pin 7 are fitted with a slight play, and the outer diameter of the elastic body 11 is adjusted so that the joint pin 7 does not directly contact the pin hole H and is held in contact with the elastic body 11. It is larger than the pin diameter.

The second embodiment is the same as the first embodiment except that the housing 7'' is formed into a V-shape so that the elastic body 11 with a relatively small wire diameter can be easily inserted.First embodiment , in the second embodiment the housing 7″
is made into a U or V-shaped diameter, but furthermore, the elastic body 11
Needless to say, the bottom cut may be formed to have a certain radius depending on the wire diameter of the wire.

``Effects'' As described above, in the present invention, the joint pin and the hole in the upper plate are brought into contact with each other through an elastic body, and the upper plate and the joint pin are fitted together using an elastic body, so that the hole and the joint plate are in contact with each other. Even if there is a small gap between them, the upper plate will not shake due to slight vibrations during chain drive, which helps reduce noise, and also prevents the pin hole from coming into contact with the joint pin. When the elastic body acts as a buffer,
Works to prevent fatigue failure from pin holes. When used as a joint for a seal chain as shown in the example, the lubricating oil on the grease filled in the gap between the pin and bushing prevents the leakage of liquefied lubricating oil (agent) due to temperature changes. In the same way that leakage of lubricating oil is completely prevented at the joint portion by the upper plate and the elastic body, it is prevented by the tightness between the ring and the pin and the link plate that is fitted and fixed. In addition, the chain can be repaired and assembled on site as in the conventional example, and the service life of the chain can be extended.

[Brief explanation of the drawing]

FIGS. 1 and 2 show a first embodiment of the present invention,
FIG. 7 is an enlarged partially cutaway cross-sectional side view of the main part of the second embodiment. Figures 3 to 5 show conventional examples,
FIG. 3 is a side view showing the organization of the chain, FIG. 4 is a plan view of FIG. 3, and FIG. 5 is a sectional view of the joint. P...Pin link, R...Roller link, J,
Ja, Jb...Joint part, C...Chain, 7...Joint pin, 7'...Groove, 7''...Housing, 8...
Upper plate, 9...clip, 11...elastic body.

Claims (1)

[Claims for Utility Model Registration] (1) A joint that connects both ends of a chain with roller links and pin links alternately connected to form a continuous chain, with the joint pins standing upright on the lower plate. Fitting and caulking: The upper plate is fitted onto the tip of the joint pin, and a clip is secured to the outside of the upper plate to prevent the upper plate from coming off. By forming a substantially U-shaped housing with a concave groove on the outer peripheral surface of the joint pin at the position where it is fitted, and fitting an elastic body into the housing, and making the outer diameter of the elastic body larger than the diameter of the joint pin, the above-mentioned A chain joint characterized by being in contact with the inner peripheral surface of a pin hole in an upper plate. (2) Utility model registration claim 1, characterized in that the elastic body fitted into the joint pin is an O-ring.
Chain joint described in section.