Hydraulic actuator and clutch therewith

Details Hydraulic actuator and clutch therewith Hydraulic actuator and clutch therewith

1996-04-03

1997-11-25

Lorence, Richard M.

192 clutches and power-stop control

Clutches

Operators

192110R, 91431, B60K 2304, F16D 2508

Patent

active

056902042

ABSTRACT:
A hydraulic actuator consists of a cylinder and a piston whose primary face is acted on by a working fluid and from whose secondary face protrudes a piston rod, the working fluid being furnished by a pressure fluid source. In order to allow for fast shifting at a precise point in time even at lowest ambient temperatures, a secondary circuit leads from the pressure fluid source via a changeover valve through channels in the wall of the cylinder and through the cylinder space to the secondary side of the piston, the changeover valve being selectively operated in order to allow working fluid to act on the primary side of the piston. By this secondary circuit, the actuator is kept at working temperature.

REFERENCES:
patent: 4007664 (1977-02-01), Popp
patent: 4059042 (1977-11-01), Bridwell et al.
patent: 4703671 (1987-11-01), Jikihara
patent: 5020419 (1991-06-01), Amedei et al.
patent: 5046592 (1991-09-01), Mainquist et al.

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