Claims
- 1. A master cylinder comprising a housing having an axially extending bore, a pair of pistons movably disposed within the bore and cooperating with a pair of pressure chambers, respectively, to generate fluid pressure therein in response to movement of the pair of pistons within the bore, a sleeve assembly disposed within the bore, the sleeve assembly including an inner surface and an outer surface exposed to fluid pressure generated in one of said pair of pressure chambers, the sleeve assembly including a slot to communicate fluid pressure from the inner surface to the outer surface, and a pair of seals cooperating with the sleeve assembly to seal the latter within the one pressure chamber, characterized by said pair of seals engaging said sleeve assembly at substantially the same axial position so that fluid pressure acting against the inner surface adjacent said pair of seals will be offset by the fluid pressure acting against the outer surface adjacent said pair of seals to reduce deformation of said sleeve assembly in response to fluid pressure, said sleeve assembly having a substantially uniform thickness except for one end thereof which is provided with an enlarged thickness, forming a sliding interface with one of the pistons, said one end substantially adjoining said pair of seals, said housing bore including a wall defining a first shoulder which engages one of said pair of seals, said first shoulder aligning with a second shoulder formed by said sleeve assembly which engages the other of said pair of seals, whereby said first and second shoulders fixedly locate said pair of seals in alignment with said sleeve assembly adjacent said one end and said one end extends away from said pair of seals toward said other pressure chamber.
- 2. The master cylinder of claim 1 further characterized by said housing supporting a reservoir containing fluid therein and defining a port leading from said reservoir to said bore and said sleeve assembly one end including a step and cooperating with the wall of said bore to define an intermediate chamber for communicating fluid from said reservoir to said other pressure chamber.
Parent Case Info
This is a continuation of application Ser. No. 270,428, filed June 4, 1981, now abandoned.
US Referenced Citations (11)
Continuations (1)
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Number |
Date |
Country |
Parent |
270428 |
Jun 1981 |
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