JP3230734B2 - Chain connection pin bearing seal device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing device for a bearing between a connecting pin of a chain and a bush.

[0002]

2. Description of the Related Art Conventionally, as a sealing device for a bearing portion between a connecting pin of a chain and a bush, there is known, for example, Japanese Utility Model Publication No. 60-51.
There is a technique disclosed in JP-A-43-43. The technique disclosed in this publication, as shown in FIG.
The seal ring S is mounted on the connecting pin P between the inner plate L2 and the outer plate L1 by the clip C to press the outer plate L1 toward the inner plate L2, thereby sandwiching the seal ring S between the outer plate L1 and the inner plate L2. Press, seal ring S
The sealability is enhanced.

[0003]

In the prior art described above, the connecting pin insertion hole of the outer plate L1 has a diameter larger than the diameter of the connecting pin P, and the connecting pin P is loosely inserted into the pin hole of the outer plate L1. Since the outer plate L1 is inserted, the outer plate L1 can be pushed toward the inner plate L2 by the clip C to pinch the seal ring S between the outer plate L1 and the inner plate L2. It is possible to prevent foreign substances such as powders, dusts, and liquids from entering the connection pin holes of the outer plate L1 from the opposing gap of the plate L2, but from the outer surface of the outer plate L1, a large-diameter connection pin of the outer plate L1. Foreign matter cannot be prevented from entering the play between the hole and the small diameter connecting pin. When the chain is used in a humid atmosphere, liquid foreign matter enters the clearance, corrodes the connecting pin hole of the outer plate L1, breaks the connecting pin hole, and causes a chain cutting accident. There was a concern that this would occur.

[0004]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a method of making at least one end of a connecting pin loosely insert and project into an outer plate.
Both ends of the bush externally fitted to the connecting pin are press-fitted into the inner plate, the first seal member is clamped in the gap between the outer plate and the inner plate, and the end of the connecting pin is loosely inserted and projected to the outer plate. And a pressurizing means for pressing the first seal member between the outer plate and the inner plate and pressing the second seal member against the outer plate of the connecting pin bearing portion. The above-mentioned subject was solved by providing in.

[0005]

The second sealing member is mounted on the protruding end of the connecting pin loosely inserted into the outer plate, and the pressurizing means is mounted on the outside of the second sealing member. The outer plate having the connecting pin loosely inserted by the pressurizing means moves inward while being pressed against the side surface to seal the connecting pin play insertion hole of the outer plate from the outside, and is sandwiched between the outer plate and the inner plate. The pressed first sealing member is pressed to seal the bearing of the connecting pin.

[0006]

FIG. 1 is a partial plan view of a roller chain according to a first embodiment of the present invention, in which a bush 2 is pressed into a pair of opposed inner plates 1A and 1B. The two ends of the bush 2 project outside the inner plates 1A and 1B. A roller R is rotatably fitted on the bush 2 between the pair of inner plates 1A and 1B. One end of the connection pin 3 inserted through the bush 2 is fitted into one outer plate 4A, and the other end of the connection pin 3 is loosely inserted into the other outer plate 4B.

First seal members 5A and 5B are sandwiched between one inner plate 1A and the outer plate 4A and between the other inner plate 1B and the outer plate 4B, respectively. The projecting end of the connecting pin 3 loosely inserted into the outer plate 4B is provided with a split pin or a retaining means 6 such as threading the end of the connecting pin 3 and screwing and fixing a nut.
A washer 7 is provided inside the retaining means 6, and an elastic washer 8 such as a spring washer, a coil spring, or rubber is provided further inside.
, Respectively, and a second seal member 9 is sandwiched between the elastic washer 8 and the outer surface of the outer plate 4B. The retaining means 6, the washer 7, and the elastic washer 8 are configured as pressurizing means for the first and second seal members.

Therefore, the elastic washer 8 presses the second seal member 9 to the outside of the outer plate 4B to seal the connecting pin play insertion hole of the outer plate 4B from the outer surface of the outer plate 4B. Outer plate 4B loosely inserted into 3
Moves while being pressed inwardly on the connecting pin 3 by the elastic washer 8, and presses the first seal members 5 </ b> A and 5 </ b> B between the inner plate and the outer plate to seal the bearing of the connecting pin 3.

FIG. 2 shows a second embodiment of the present invention. FIG. 2 is a plan view of a main part of a roller chain in which both ends of a connecting pin 3 are loosely inserted into outer plates 4A and 4B, respectively. Parts 6A, 6B, washers 7A, 7B, elastic washers 8A, 8B and second seal members 9A, 9B.
Are mounted as in the case of FIG.

FIG. 3 shows a third embodiment of the present invention, in which a roller 10 is interposed between a bush 2 and a connecting pin 3, and the connecting pin 3 is loosely inserted into one outer plate 4B. The same members as those in FIG. 1 are denoted by the same reference numerals.

The roller 10 reduces the frictional resistance in the relative rotation between the bush 2 and the connecting pin 3, and reduces the inner plate 1A,
1B and the outer plates 4A and 4B are lightly bent relatively around the connecting pins 3. Both ends of the roller 10 are lipped via a spacing ring D for preventing the roller 10 from moving in the axial direction. The lip seal member S is supported by the seal member S.
Is provided between the inner plates 1A, 1B and the outer plates 4A, 4B to enhance the sealing performance, prevent the internal lubricating oil from flowing out, and enhance the dustproof, dripproof, and waterproof effects.

FIG. 4 shows a fourth embodiment of the present invention. The difference from the chain shown in FIG. 3 is that both ends of the connecting pin 3 are loosely inserted into a pair of outer plates 4A and 4B, respectively. Is a point. That is, both ends of the connecting pin 3 are loosely inserted into the pair of outer plates 4A, 4B, and the outer plates 4A, 4B
The retaining pin 6 is provided on the connecting pin 3 projecting further outward.
A, 6B, washers 7A, 7B, elastic washers 8A, 8B and second seal members 9A, 9B are mounted respectively.
It has the operation described in FIG.

In the embodiment shown in FIGS. 1 to 4, the first seal members 5A, 5B and the second seal members 9, 9A, 9
B is made of resin, and the resin material is preferably polytetrafluoroethylene having low friction, water resistance, and chemical resistance. Further, an annular groove is formed in the pressure contact surface of the first and second seal members. The material of the elastic seal ring 11 fitted in the concave groove is also preferably a nitrile rubber having low friction, water resistance and chemical resistance. When the elastic seal ring 11 is fitted on the press contact surfaces of the first and second seal members, the sealing performance is more stably maintained. In the above-described embodiment, the case where both ends of the bush protrude outside the inner plate has been described.
In some cases, both ends of the bush do not protrude outside the inner plate. If not, the first seal members 5A, 5B
Is mounted on the peripheral surface of the connecting pin in the gap between the inner plates 1A, 1B and the outer plates 4A, 4B.

[0014]

According to the present invention, a pressurizing means is provided at an end of a connecting pin loosely inserted into an outer plate, and a second seal member is sandwiched between the pressurizing means and an outer surface of the outer plate. Therefore, since the connecting pin play insertion hole of the outer plate can be sealed from the outer surface of the outer plate, there is an effect of dustproof, drip-proof, waterproof, and the like. Not only does not penetrate and prevents corrosion of the play insertion hole, but also the outer plate with the end of the connecting pin loosely inserted is always urged inward by the pressurizing means. Since the first seal member sandwiched between the first and second seal members is always urged to squeeze and maintain a sealing function, the outflow of internal lubricating oil and the intrusion of foreign matter from the outside are prevented, and the lubricating property of the connecting pin bearing portion is reduced. To obtain a highly durable chain by maintaining wear and preventing abrasion It can be.

Further, when the first and second seal members are made of resin, the frictional resistance is reduced and the relative bending action between the outer plate and the inner plate is performed smoothly. If an elastic seal ring is fitted to the resin seal member, the sealing performance is further increased.

[Brief description of the drawings]

FIG. 1 is a partial plan view of a first embodiment of the present invention, which is a partial cross section.

FIG. 2 is a plan view of a main part of a second embodiment of the present invention, which is a partial cross section.

FIG. 3 is a plan view of a main part according to a partial cross section of a third embodiment of the present invention.

FIG. 4 is a plan view of a main part according to a partial cross section of a fourth embodiment of the present invention.

FIG. 5 is an essential part perspective view showing a conventional example.

[Explanation of symbols]

 1A, 1B Inner plate 2 Bush 3 Connecting pin 4A, 4B Outer plate 5A, 5B First seal member 6 Retaining means 7 Washer 8 Elastic washer 9, 9A, 9B Second seal member 11 Elastic seal ring

──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model Sho 52-52578 (JP, U) Japanese Utility Model Sho 52-151259 (JP, U) Japanese Utility Model Sho 53-90344 (JP, U) Japanese Utility Model Sho 55- 28152 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16G 13/00-17/00 B65G 17/00-17/48

Claims (2)

(57) [Claims] 1. A connecting pin bearing portion of a chain, wherein at least one end of a connecting pin is loosely inserted and projected into an outer plate, and both ends of a bush externally fitted to the connecting pin are press-fitted into an inner plate, and the outer plate and the inner plate are inserted. A first seal member is sandwiched in a gap between the plates, a second seal member is attached to an end of the connecting pin that is loosely inserted and protruded into the outer plate, and the first seal member is sandwiched between an outer plate and an inner plate. A bearing seal device wherein pressurizing means for pressing and pressing a second seal member against an outer plate of a connection pin bearing portion is provided at a free insertion end of a connection pin. 2. The bearing seal device according to claim 1, wherein the first seal member and the second seal member comprise a resin washer and an elastic seal ring fitted in a concave groove formed in a press-contact surface of the washer.