Hydraulic actuator for a servomotor with an end lock function

Details Hydraulic actuator for a servomotor with an end lock function Hydraulic actuator for a servomotor with an end lock function

2007-02-07

2009-12-01

Lazo, Thomas E (Department: 3745)

Motors: expansible chamber type

Fluid supply through diverse paths to single expansible chamber

One path includes restriction

C091S459000, C060S422000

Reexamination Certificate

active

07624671

ABSTRACT:
A hydraulic actuator for a hydraulic servomotor (4) is disclosed. The hydraulic servomotor (4) is of a kind having at least one defined end position, and has a first chamber (5) and a second chamber (6) associated therewith. The actuator is connected to a fluid source (2) and a fluid drain (3). The actuator comprises a first valve (7) fluidly connected between the fluid source (2) and the first chamber (5), a second valve (8) fluidly connected between the first chamber (5) and the fluid drain (3), and a third valve (9) fluidly connected between the fluid source (2) and the second chamber (6). The actuator further comprises a flow channel (10, 17), preferably comprising a flow restrictor (12, 18), in fluid communication with the second chamber (6).The valves (7, 8, 9) are such that, in the case of a power cut off, they will prevent a fluid flow out of the first chamber (5), and a fluid flow out of the second chamber (6) takes place via the flow channel (10, 17). This will cause a servomotor piston member (13) to move towards the second chamber (6), thereby moving the hydraulic servomotor (4) to an end position.

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