Apparatus for preventing disengagement of seal member in a boost

Motors: expansible chamber type – Working member position feedback to motive fluid control – Follower type

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F15B 910

Patent

active

055864813

ABSTRACT:
A booster as may be used in a brake of an automobile is provided. Specifically, an improvement of means for sealing between a stepped tubular portion formed on the rear side of a shell and a tubular terminal end of a valve body which extends therethrough is provided. According to the invention, an annular seal member and a bearing are sequentially fitted inside the stepped tubular portion of the shell from the front side and their inner peripheral portions are disposed in sliding contact with the tubular terminal end of the valve body. A plurality of projections are formed on either end face of the seal member or the bearing which opposes each other around its outer periphery. The provision of such projections is effective to prevent the seal member from being disengaged from the step of the stepped tubular portion in the rearward direction.

REFERENCES:
patent: 3845692 (1979-11-01), Takeuchi
patent: 4522108 (1985-06-01), Takeuchi et al.
patent: 4793242 (1988-12-01), Kobayashi
patent: 4846047 (1989-07-01), Uyama et al.
patent: 5146837 (1991-09-01), Inoue
patent: 5337650 (1994-08-01), Uyama

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