Hydraulic stop

Details Hydraulic stop Hydraulic stop

1977-05-31

1979-11-27

Freeh, William L.

Pumps

Condition responsive control of drive transmission or pump...

Adjustable cam or linkage

92 85B, F04B 130

Patent

active

041759141

ABSTRACT:
This automatic hydraulic cushioning device for cam plate positioning actuators on variable displacement, axial piston pumps eliminates the noise, vibration, and wear caused by hammering of the positioning actuator on the back plate when the actuator is close to full retraction. A supply of fluid under pressure, which is available at the back plate, is channeled to the cam plate positioning actuator. A valve in the actuator blocks off drainage of the fluid whenever the actuator is close to its fully retracted position. This retained fluid becomes a hydraulic stop and cushion for the actuator thus eliminating the hammering as well as the noise, vibration, and wear which results from the hammering.

REFERENCES:
patent: 2284897 (1942-06-01), Harrington
patent: 2915985 (1959-12-01), Budzich
patent: 3023739 (1962-06-01), Dickson et al.
patent: 3213760 (1965-10-01), Carr
patent: 3554093 (1971-01-01), Lonnemo
patent: 3559538 (1971-02-01), Holder
patent: 3732041 (1973-05-01), Beal et al.

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