Servo-control valve for a linear hydraulic motor

Details Servo-control valve for a linear hydraulic motor Servo-control valve for a linear hydraulic motor

1977-06-30

1980-07-08

Michalsky, Gerald A.

Motors: expansible chamber type

Relatively movable working members with one having motive...

With means interconnecting working members to cause relative...

137595, 13762418, 251213, F15B 1302

Patent

active

042111471

ABSTRACT:
A servo-control valve for a linear hydraulic motor wherein the control valve piston is isolated from the side loading of a cam and roller by employing a cam follower plunger, as a separate detached element coaxial with the piston. The valve piston and the cam follower plunger are maintained in intimate contact due to the constant back pressure applied by the hydraulic system. The plunger is encased in a cylindrical array of balls which are preloaded between the plunger and the piston chamber walls such that the plunger experiences essentially only rolling friction, but no sliding friction, as the plunger moves. This form of preloading of the balls eliminates the backlash associated with clearance around the plunger.

REFERENCES:
patent: 3271087 (1966-09-01), Wieland et al.
patent: 3848515 (1974-11-01), Gardineer et al.

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