JPS6131214Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sealing device at the joint of each link of a roller chain.

As shown in FIG. 1, a conventional roller chain used for power transmission has an outer link 2 and an inner link 3, and a bush 4 fitted in a hole in the inner link 3 and a pin that passes through the outer link 2. They are connected to each other via 1. A cavity 7 is provided between the connected pin 1 and the bush 4, and the pin 1 and the bush 4 are configured to swing relative to each other. A gap 5 is provided between both links 2 and 3 to prevent leakage to the outside or to prevent foreign matter from entering the space.
A sealing device has been proposed in which an O-ring 6 made of an elastic material is sandwiched in this gap 5.

However, in this type of conventional sealing device, the space 7 between the lubricant-filled pin 1 and the bush 4 and the outside are connected to both sides 8 of the O-ring 6,
8' and the side surfaces of each link, the chain is rotated by the sprocket and the O-ring 6 receives a fluctuating force, causing the planar contact area to become larger or smaller. When this happens, lubricant leakage and dust etc. are likely to enter. Furthermore, since the O-ring 6 slides in a flat state at this time, it is rapidly worn and damaged.

The present invention was developed in view of the problems in the prior art as described above, and the technical problem is to prevent the annular packing from being worn and damaged even when subjected to fluctuating forces, and to prevent the pin from being damaged. The objective is to retain the lubricant on the side and effectively prevent dust etc. from entering from the outside.

The technical means of the present invention for solving this problem is configured as follows.

That is, it has a pin that swingably connects the outer link and the inner link to each other, and a bushing that is loosely engaged on the outer peripheral surface of the pin, and between the mutually opposing side surfaces of the outer link and the inner link. An annular packing made of elastic material is inserted into the gap between
An annular support part that faces the outer link and the inner link with a convex arcuate cross section and has an elastic force and serves as a support, and a space between the outer peripheral part of the annular support part and the annular support part. a flange portion having an annular groove formed therein and protruding obliquely outward and having respective protrusions in sealing contact with the side surfaces of the outer link and the inner link; and a flange portion having protrusions that project diagonally inward and sealingly contact the outer link side surface and the inner link side surface with an annular groove formed therebetween.

Hereinafter, one embodiment of the present invention will be described based on the drawings. FIG. 2 is a cross-sectional view of the roller chain sealing device of the present invention, in which the outer link 2 and the inner link 3, which are connected to each other by a pin, are fitted into a hole in the inner link 3 and protrude from the outer surface. By arranging the end surface of the bushing 4 to face the inner peripheral surface of the outer link 2, a gap 5 is provided, and an annular packing 10 as shown in the enlarged sectional view of FIG. 3 is disposed within the gap 5. has been done. The annular packing 10 includes an annular support part 11 which is the largest elastic body, has an elliptical cross section, and has an arcuate surface facing the side surfaces of both links 2 and 3, and the annular support part 11. an outer flange portion 15 having a substantially V-shaped cross section extending radially outward from the outer peripheral surface of the annular support portion 11 toward the outer link 2 side surface and the inner link 3 side surface; It consists of an inner flange portion 15' having a substantially V-shaped cross section extending inward toward the side surface of the outer link 2 and the side surface of the inner link 3, and the ends of both the inner and outer flange portions 15, 15' a protrusion 12 that is a seal lip that is flush with or slightly protrudes from the maximum width of the body 11;
12', 16, 16' are formed.

And an annular packing 10 made of rubber-like elastic material.
Both sides of the annular support portion 11 in the axial direction are joined to each side surface of both the inner and outer links 2 and 3, and the protrusion portion 1
2, 12', 16, 16' are in close contact with the side surfaces of both the inner and outer links 2, 3, and the annular grooves 14, 14', 1
7, 17' and the side surfaces of each link 2, 3 form a void. In one embodiment, this cavity is filled with grease. Leakage of the lubricant in the cavity 6 formed between the pin 1 and the bush 4 to the outside is prevented by sealing contact between the projections 12, 12' and both the inner and outer links 2, 3. It constitutes a deterrent effect. Further, the annular groove portions 14, 14'
The sealing effect on the cavity 7 and the prevention of intrusion are further ensured by the grease present in the interiors 17, 17'.

The roller chain sealing device of the present invention having the above-described configuration provides the following effects.

Since the elastic annular support part of the annular packing is connected to the side surfaces of both the inner and outer links, it elastically supports the inner and outer links as they try to approach each other, and prevents the protrusion from losing its sealing force. Prevent it from being bent. In particular, when the annular packing is strongly pressed, since the annular support part is formed into a convex arcuate surface and has an annular groove, the elastically deformed volume of the annular support part will cause the flange side to move on both sides. The protrusion is pressed so as to expand toward the side surface of the link to bring it into strong sealing contact with the side surface of both the inner and outer links. As a result, the inner flange strongly seals the lubricating oil in the empty chamber even when subjected to intense vibration force from both the inner and outer links, and the outer flange prevents moisture, dust, etc. from entering from the outside. It can be strongly prevented. In particular, when the annular support section is compressed to a greater extent and its volume escapes to the flange side, causing the protrusion to come into too strong pressure contact with the side surface of the link, by providing grease or the like in the annular groove, this grease can be applied to the protrusion. As a result of experiments, it can be expected that the sealing performance will be prevented from deteriorating, and the sliding wear of the protrusions will be reduced. In addition, since the annular support part is joined to the side surfaces of both links and is formed with a convex arcuate cross section, it fits easily even when sliding on the side surfaces of both links, minimizing wear. can. In particular, conventional O-rings tend to roll and be damaged due to sliding on both links, but in the case of the present invention, both inner and outer flanges are formed in both radial directions, so the annular support Both flanges can prevent the body from rolling.

As a result, wear can be effectively prevented over a long period of time even if the annular packing is subjected to a violently fluctuating action when the roller chain rotates. In particular, when grease or the like is contained in the annular groove, this grease can prevent wear and tear on the annular support and the protrusion over a long period of time. In this manner, the annular support portion and the protruding portion can dramatically improve both the sealing effect and the wear resistance through their cooperative action.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a roller chain equipped with a sealing device according to the prior art, FIG. 2 is a cross-sectional view of a roller chain equipped with a sealing device according to the present invention, and FIG. It is an enlarged sectional view of packing. 1...Pin, 2...Outer link, 3...Inner link, 5...Gap, 6...O-ring, 7...Vacancy, 8, 8'...O-ring side, 10... Annular packing, 11...Body portion, 12, 12'...
Projection, 13... Center hole, 14, 14'... Annular groove, 15, 15'... Flange, 16, 1
6'... Protrusion, 17, 17'... Annular groove.

Claims (1)

[Utility Model Claims] 1. A structure comprising an outer link 2, an inner link 3, a pin 1 connecting the outer link 2 and the inner link 3 to each other so that they can swing, and a bushing 4 loosely fitted on the outer peripheral surface of the pin 1, an annular packing 10 made of an elastic material inserted into a gap 5 between the opposing side surfaces of the outer link 2 and the inner link 9, an annular support portion 11 which faces the outer link 2 and the inner link 3 with a convex arc-shaped cross section and has elasticity to serve as a support, and a ring-shaped support portion 12 which extends from the outer peripheral portion of the annular support portion 11 to the annular support portion 1
A flange portion 15 having protrusions 12, 12' protruding obliquely outwardly and forming annular grooves 14, 14' between the outer link 2 and the inner link 3 and having protrusions 12, 12' that come into sealing contact with the side surfaces of the outer link 2 and the inner link 3, and a flange portion 15 extending from the inner periphery of the annular support portion 11 to the annular support portion 1
The protrusions 17, 17' protrude obliquely inwardly and form annular grooves 17, 17' between the outer link 2 and the inner link 3. The protrusions 17, 17' protrude obliquely inwardly and make sealing contact with the side surfaces of the outer link 2 and the inner link 3.
2. A sealing device for a roller chain according to claim 1, wherein the annular grooves 14, 14', 17, 17' are grooves for lubricating oil.