JPH0754932A - Seal chain - Google Patents

Abstract

PURPOSE:To provide a seal chain equipped with a seal ring of high reliability which is free from being attacked by an alkali solution for washing, etc. CONSTITUTION:An 0-ring 21 of synthetic rubber to be in tight attachment with the end of a bushing 7 is combined in a single piece with an anti-alkaline ring 22 of plastic to be in tight attachment with a roller link plate 6 and pin link plate 2 in such a condition as fitted in a groove 22 furnished at the inside surface, and thereby a seal ring 20 is formed. Therein the plastic ring 22 covers perfectly the peripheries of the O-ring 21, so that the O-ring 21 is free from risk of hardening upon touching an alkali solution even in case the seal chain is dipped in alkali solution and washed. Therefore, the seal chain has a high reliability because the seal ring 20 exerts its function for a long period of time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is designed to seal a lubricating oil filled in a gap between a pin and a bush by mounting a seal ring between a roller link plate and a pin link plate. The present invention relates to a seal chain used as a service, and more specifically, to a structure of the seal ring.

[0002]

2. Description of the Related Art FIG. 7 is a sectional view of an essential part showing an example of a conventional seal chain.

As shown in the figure, this seal chain 1 has two
A pin link 5 in which two steel pin link plates 2 are connected by pins 3 and two roller link plates 6 are similarly connected by bushes 7, and rollers 9 are rotatably fitted in the bushes 7. Roller link 10
And are alternately connected endlessly. Moreover, the end portion of the bush 7 is projected from the roller link plate 6, and the seal ring 11 is mounted between the roller link plate 6 and the pin link plate 2 so as to surround the projected end portion of the bush 7. By doing so, the lubricating oil filled in the gap between the pin 3 and the bush 7 which is the bearing portion of the seal chain 1 is sealed, and at the same time, dust and the like are prevented from entering the bearing portion from the outside. It is configured.

As the seal ring 11, a ring having a substantially X-shaped cross section formed of synthetic rubber as in the conventional example, or an O-ring made of synthetic rubber is also used.

[0005]

The seal chain is often used in an environment where it is easily contaminated with a lot of dust,
When it becomes dirty, it is washed by immersing it in an alkaline solution.

However, in the conventional seal chain 1 as described above, the seal ring 11 made of synthetic rubber is gradually attacked by the alkaline solution as it is repeatedly washed with the alkaline solution. There is a problem in that the ring 11 finally hardens and cracks occur in the ring 11 and the ring does not function as a seal ring.

Further, depending on the environment in which the seal chain 1 is used, an alkaline solution other than for cleaning may adhere to the seal chain 1, and in that case also the seal ring 11 is damaged.

The present invention has been made to solve this problem, and an object thereof is to provide a highly reliable seal chain having a seal ring which is not attacked by an alkaline solution for cleaning or the like. .

[0009]

In the seal chain (1A) according to the present invention, the seal ring (20) is a synthetic rubber ring (21) which is in close contact with the end of the bush (7), and the synthetic rubber ring (21). 21) and an alkali-resistant synthetic resin ring (22) that is in close contact with the roller link plate (6) and the pin link plate (2) in a state where the groove (22a) provided on the inner peripheral surface is fitted. It is characterized in that it is configured by integrally combining.

Further, in another seal chain (1B) according to the present invention, the seal ring (30) is made of an alkali-resistant synthetic resin and has a substantially circular cross section which is in close contact with the end of the bush (7). An outer peripheral portion (32) having a peripheral portion (31) and a plurality of lips (32a to 32d) closely contacting the roller link plate (6) and the pin link plate (2).
It is composed of and.

[0011]

In the seal ring (20) of the first seal chain (1A), the alkali-resistant synthetic resin ring (2
Since 2) completely covers the outer periphery of the synthetic rubber ring (21), even if the seal chain (1A) is dipped in an alkaline solution for cleaning, the alkali-resistant synthetic resin ring (22) will not be alkaline. The synthetic rubber ring (21) does not cure by being contacted with the alkaline solution only by touching the solution.

The second seal chain (1B)
Since the entire seal ring (30) is made of alkali-resistant synthetic resin, the seal chain (1)
Even when B) is immersed in an alkaline solution for cleaning, it is not attacked by the alkaline solution. Further, the seal ring (30) is provided with lips (32a to 3) of the outer peripheral portion (32).
2d) presses against the pin link plate (2) and the roller link plate (6) due to its elasticity, and reliably seals between the two plates (2, 6).

The reference numerals in the above parentheses are for the purpose of comparison with the drawings and do not limit the structure of the present invention.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. In the drawings of the embodiments, constituent elements that are not different from those of the conventional example shown in FIG. 7 are designated by the same reference numerals, and description thereof will be omitted. <Embodiment 1> FIG. 1 is a sectional view of an essential part of a seal chain according to Embodiment 1 of the present invention, and FIG. 2 is a partially enlarged sectional view of FIG.

As shown in the figure, the characteristic feature of this seal chain 1A is that the seal ring 20 is mounted between the roller link plate 6 and the pin link plate 2 to seal the lubricating oil in the gap between the pin 3 and the bush 7. It is in.

That is, the seal ring 20 is constructed by integrally combining a synthetic rubber ring (for example, a synthetic rubber O-ring) 21 and an alkali-resistant synthetic resin ring 22 located on the outer periphery of the synthetic rubber ring 21. ing.
The synthetic resin ring 22 has a groove portion 22a provided on the inner peripheral surface thereof, and the synthetic rubber ring 2 is provided in the groove portion 22a.
1 is fitted. In addition, in the case of the first embodiment, the synthetic resin ring 22 has four lips 22b to 22e so as to have elasticity, and is formed in a substantially X-shaped cross section.

In the seal ring 20, the inner circumference of the synthetic rubber ring 21 is in close contact with the end of the bush 7, and the two lips 22b, 22c of the synthetic resin ring 22 are provided.
Is attached to the pin link plate 2 and the other two lips 22d,
22e are attached to the roller link plates 6 in close contact with each other.

In the seal ring 20 having the above-mentioned structure, the alkali-resistant synthetic resin ring 22 completely covers the outer periphery of the synthetic rubber ring 21, so that even when the seal chain 1A is immersed in an alkaline solution for cleaning. The synthetic rubber ring 21 does not come into contact with the alkaline solution to be cured only by contacting the alkaline resistant synthetic resin ring 22 with the alkaline solution. Similarly, when an alkaline solution other than for cleaning adheres to the seal chain 1A, the synthetic rubber ring 21 is protected by the synthetic resin ring 22 as well.

Therefore, the seal chain 1A provided with the seal ring 20 having the above-described structure is highly reliable because the seal ring 20 performs its function for a long period of time, and as a result, the cost is low. Further, as in this embodiment, since the synthetic resin ring 22 has the lips 22b to 22e, the seal ring 20 has the lips 22b to 22e.
Elastically presses the pin link plate 2 and the roller link plate 6 together, and the synthetic rubber ring 21 embedded in the synthetic resin ring 22 adheres tightly to the bush 7, and seals between the plates 2 and 6 and the bush 7. Make sure.

Regarding the groove portion 22a of the synthetic resin ring 22 of the seal ring 20, when the lips 22c and 22e on both sides of the groove portion 22a are pressed against the pin link plate 2 and the roller link plate 6, the synthetic rubber is used. In order for the ring 21 to spread easily in the radial direction due to its elasticity,
A gap g may be provided between the bottom surface portion and the synthetic rubber ring 21.

Further, as the synthetic rubber ring 21,
The packing is not limited to the O-ring, but may be a U packing as shown in the sectional view of FIG. 3A or an X ring as shown in the sectional view of FIG. 3B. <Embodiment 2> FIG. 4 is a sectional view of a main part of a seal chain according to Embodiment 2 of the present invention, and FIG. 5 is a partially enlarged sectional view of FIG.

As shown in the figure, in the seal chain 1B according to the second embodiment, the seal ring 30 is entirely made of an alkali-resistant synthetic resin, and has an inner peripheral portion having a substantially circular cross section that comes into close contact with the end portion of the bush 7. 31 and an outer peripheral portion 32 having a plurality of, for example, two lips 32a to 32d on each side, which are in close contact with the roller link plate 6 and the pin link plate 2.

The seal ring 30 having the above-mentioned structure is provided in the outer peripheral portion 3
The two lips 32a to 32d are pressed against the pin link plate 2 and the roller link plate 6 due to their elasticity, and the plates 2 and 6 are reliably sealed.

If a seal ring 30 made entirely of an alkali-resistant synthetic resin is mounted as in the seal chain 1B in the second embodiment, even when the seal chain 1B is immersed in an alkaline solution and washed, Or even if you touch it with an alkaline solution other than for cleaning,
The seal ring 30 is not attacked by the alkaline solution. Therefore, this seal chain 1B is the same as that of the first embodiment.
As with the seal chain 1A, the seal ring 3
0 is highly reliable and can perform its function for a long period of time.

The outer peripheral portion 32 of the seal ring 30 is
However, the present invention is not limited to the one having two lips 32a to 32d on each side, and may have one lip 32a, 32c on each side as shown in the sectional view of FIG.

[0026]

As described above, in the seal chain according to the present invention, the outer periphery of the synthetic rubber O-ring is completely covered with the alkali resistant synthetic resin ring,
Or because the whole is made of alkali-resistant synthetic resin, even if you repeatedly clean the dirty seal chain,
It is not attacked by alkaline solutions for cleaning.
Therefore, the seal ring can fulfill its function for a long time,
It is reliable and at a low cost as a result.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part of a seal chain according to a first embodiment of the present invention.

FIG. 2 is a partially enlarged sectional view of FIG.

3A and 3B are cross-sectional views showing another example of the synthetic rubber ring of the seal ring in the first embodiment of the present invention.

FIG. 4 is a sectional view of a main part of a seal chain according to a second embodiment of the present invention.

5 is a partially enlarged sectional view of FIG.

FIG. 6 is a cross-sectional view showing another example of the outer peripheral portion of the seal ring according to the second embodiment of the present invention.

FIG. 7 is a sectional view of a main part of a seal chain in a conventional example.

[Explanation of symbols]

 1A, 1B Seal chain 2 Pin link plate 3 Pin 6 Roller link plate 7 Bush 20,30 Seal ring 21 Synthetic rubber ring 22 Synthetic resin ring 22a Groove 31 Inner circumference 32 Outer circumference 32a to 32d Lip

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Motohiro Hashimoto 663 Minoshima, Arita-shi, Wakayama Mitsubishi Cable Industries Co., Ltd. (72) Inventor Mamoru Sato 663 Minoshima, Arita-shi, Wakayama Mitsubishi Cable Industries Ltd. Inventor Masahiro Nikami 663 Minoshima, Arita-shi, Wakayama Mitsubishi Cable Industries Co., Ltd. (72) Inventor Atsushi Hosokawa 663 Minoshima, Arita-shi, Wakayama Mitsubishi Cable Industries Co., Ltd.

Claims (2)

[Claims] 1. A pin and a bush are formed by projecting a bush end from a roller link plate and mounting a seal ring between the roller link plate and the pin link plate so as to surround the projected bush end. In a seal chain formed by sealing the lubricating oil filled in the gap, the seal ring is fitted to the bush end portion, and the synthetic rubber ring is fitted to the groove portion provided on the inner peripheral surface. A seal chain comprising a roller link plate and an alkali-resistant synthetic resin ring that are in close contact with the pin link plate in an assembled state and are integrally combined. 2. A pin and a bush are provided by projecting an end of the bush from the roller link plate and mounting a seal ring between the roller link plate and the pin link plate so as to surround the projected bush end. In a seal chain formed by sealing the lubricating oil filled in the gap of the above, the seal ring is made of an alkali-resistant synthetic resin, and has an inner peripheral portion having a substantially circular cross section that is in close contact with the bush end portion, and the roller. A seal chain comprising a link plate and an outer peripheral portion having a plurality of lips that are in close contact with a pin link plate.