Hydro-pneumatic actuator with automatic slack adjuster

Details Hydro-pneumatic actuator with automatic slack adjuster Hydro-pneumatic actuator with automatic slack adjuster

F - Mech Eng,Light,Heat,Weapons

15

B

138/84

F15B 15/14 (2006.01) B60T 13/44 (2006.01) B60T 13/58 (2006.01) F16D 65/74 (2006.01)

Patent

CA 1193517

ABSTRACT OF THE DISCLOSURE A hydro-pneumatic actuator for providing a two-stage buildup of the hydraulic output pressure. A primary hydraul- ic piston, to which a pneumatic input piston actuator is con- nected, acts in a larger bore of a hydraulic cylinder to transfer fluid via a central passage in a spring-loaded, dif- ferential area, secondary hydraulic piston, that is coaxially disposed in the hydraulic cylinder in spaced-apart relation- ship with, and downstream of, the primary piston. A larger face of the secondary piston is in the larger bore and the smaller face is in a reduced diameter bore of the hydraulic cylinder, so that a pressure buildup in the hydraulic cylinder effects actuation of the secondary piston to close a check valve and thereby inter-fluid communication between the larger and smaller bores of the hydraulic cylinder via the central passage. The smaller face of the secondary piston is there- fore effective to transmit the hydraulic force with a high gain multiplication factor following attainment of an initial predetermined force with low gain. The arrangement includes a displacement cylinder to meas- ure the pneumatic piston stroke and an expansion chamber into which fluid is drawn from the reservoir when piston stroke is excessive for subsequent transfer to the hydraulic cylinder.

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