Hydraulic pump having cam driven, spring biased piston

Details Hydraulic pump having cam driven, spring biased piston Hydraulic pump having cam driven, spring biased piston

1993-10-01

1995-03-07

Bertsch, Richard A.

Pumps

Expansible chamber type

Including valve assembly, disassembly, or inspection...

417549, 417554, 277 59, F04B 2104

Patent

active

053952197

ABSTRACT:
A hydraulic pump including a housing having a housing bore with a piston sliding in an axial direction in the bore and a pump chamber being defined in cavity adjacent one end of the piston. A piston drive mechanism is provided in a housing chamber defined in the bore adjacent the other end of the piston. Piston return springs are mounted in the pump chamber biasing the piston towards the piston drive mechanism. An inlet valve is arranged in the pump chamber opening and closing an axial bore in the piston connected to an inlet passage. An outlet valve is set on a downstream side of the pump chamber opening and closing an outlet passage. Two elastic seal members are mounted around a circumference of the piston respectively sealing an area between the pump chamber and the inlet passage and an area between the inlet passage and the housing chamber.

REFERENCES:
patent: 4534711 (1985-08-01), Wakatsuki
patent: 5039283 (1981-08-01), Mergenthaler et al.

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