Shaft seal device

Abstract

A shaft sealing device having a first seal section, a second seal section, a first back plate, and an engagement ring. The first sealing section has a fitting section fitted in a seal housing, a first seal lip whose inner peripheral surface is sealingly fitted on the outer peripheral surface of a shaft to seal fluid, and a reinforcement ring having reinforcement section for holding the first seal lip and also having a tube section and connection section that are integrally joined to the fitting section. The second seal section is made of resin, placed on the opposite side of the first seal section from the sealed fluid, and has the inner peripheral surface sealingly fitted on the shaft. The first back plate is supported by the reinforcement ring or engagement ring for holding a support section of the second seal section. The engagement ring has a fitting section fitted to a hole forming surface of the seal housing, has a first engagement section engaging with an end face of the seal housing, and has a second engagement section for causing the first engagement section to support the reinforcement ring. The device has a seal between the surface of the engagement ring and the hole forming surface, and the seal has a smaller radial thickness than the reinforcement ring or the engagement ring.

Description

technical field [0001] The present invention relates to a shaft seal device for sealingly blocking a gap between a rotary shaft mounted on a hole forming surface of a cover and the hole forming surface by a sealing fluid. In particular, it relates to a shaft seal device in which a sealing portion made of a rubber-like elastic material and a sealing portion made of a resin material are arranged in parallel to improve pressure resistance against a fluid to be sealed and facilitate installation. Background technique [0002] As related technology of the shaft seal device of the present invention, there is a shaft seal device similar to Patent Document 1 described below. This shaft sealing device is mounted in a bearing mounting hole around a rotating shaft through which a wall of a pump casing penetrates, and seals a to-be-sealed fluid. In addition, the sealed fluid is, for example, cooling water pumped by a pump to cool the radiator. [0003] The shaft sealing device 100 is ...

AI Technical Summary

Problems solved by technology

Since the flange portion 210A must press or machine the outer peripheral surface of the thin-walled metal ring 210, the processing is difficult.

Therefore, making the sealing device 200 unsuitable for mass production

[0007] In addition, since the metal ring 210 is embedded in the installation hole of the cover body 260, the sealed fluid may leak from the joint between the metal ring 210 and the cover body 260.

Furthermore, the accumulation of sealed fluid in the fitting ring between the metal ring 210 and the cover body 260 will cause the metal ring 210 to rust.

In addition, when the sealing device 200 is taken out from the installation hole of the cover body 260 in order to repair the sealing device 200 etc., it becomes difficult to take out the metal ring 210 of the sealing device 200 which is pressed in due to the combination of the two parts.

In addition, when the fitting surface of the ferrule 210 is rusted, it is more difficult to take it out from the cover body 260 due to strong adhesion due to the rust.

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