Self-bleeding hydraulic pumping apparatus

Details Self-bleeding hydraulic pumping apparatus Self-bleeding hydraulic pumping apparatus

1988-09-06

1990-02-06

Green, Randall L.

Motors: expansible chamber type

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

Cylinders parallel to rotation axis

91499, 92 122, 92 70, 92 71, 92107, F01B 300, F01B 1304

Patent

active

048980773

ABSTRACT:
A swash plate type hydraulic pumping assembly (10) including a plurality of pistons (28) axially reciprocated in individual chambers (22) of a rotor (20). Each piston (28) includes a hollowed central cavity (30) supporting a compression spring (54) which urges the piston (28) out of the chamber (22) and toward a camming surface (64) of the swash plate (60). A tube (42) is disposed in the chamber (22) adjacent a hydraulic fluid exhaust port (24) and forms the only flow route for fluid entering or exiting the chamber (22). A top surface (34) in the cavity (30) of the piston (28) is spaced from the exhaust port (24) and collects gas inclusions trapped in the fluid during operation. When the piston (28) is moved in the chamber (22) to a fully compressed position, the top spaced surface (34) is very close to the tube (42) allowing the trapped gas inclusions to be swept away from the top spaced surface (34) and out of the pump assembly (10).

REFERENCES:
patent: 1970133 (1934-08-01), Ferris et al.
patent: 2467916 (1949-04-01), Shepard
patent: 2480069 (1949-08-01), Wright
patent: 2625109 (1953-01-01), Coberly
patent: 3319576 (1967-05-01), Orshansky, Jr.
patent: 3375756 (1968-04-01), Bienaime
patent: 3450058 (1969-06-01), Stein
patent: 3667867 (1972-06-01), Boydell et al.
patent: 3830593 (1974-08-01), Chanal
patent: 4188859 (1980-02-01), Van Wagenen et al.

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