Fluid motor-pump unit

Details Fluid motor-pump unit Fluid motor-pump unit

1979-02-16

1981-10-27

Freeh, William L.

Pumps

Three or more cylinders arranged in parallel, radial, or...

Motor driven

91180, 91503, F04B 116, F04B 1700, F01L 3302

Patent

active

042970865

ABSTRACT:
A fluid motor-pump unit having a circumferentially arranged set of pistons axially reciprocal within a stationary cylinder block, and a rotating valve plate for sequentially porting the pistons between high and low pressure hydraulic ports of an hydraulic system. Apparatus and method are disclosed for dynamically pressure-balancing the rotating valve plate for low friction and low wear operation.

REFERENCES:
patent: Re15756 (1924-02-01), Michell
patent: 3369491 (1968-02-01), Hoffer
patent: 3530893 (1970-09-01), Masuda
patent: 3627451 (1971-12-01), Rouns
patent: 3823557 (1974-07-01), Wagenen et al.
patent: 4168652 (1979-09-01), Rick

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