Hydraulic actuator and clutch therewith
AssigneeSteyr-Daimler-Puch AG
InventorAnton Schonleitner
Life of this patent
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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.
Claims8
A hydraulic actuator comprising a cylinder;
- a piston mounted for axial movement within the cylinder, said piston having a primary face and a secondary face;
- a piston rod projecting from said secondary face;
- a fluid pressure source;
- conduit means including a changeover valve having a first position for selectively circulating working fluid from the fluid pressure source through said conduit means and a primary circuit to act on the primary face of the piston;
- and a secondary circuit for circulating working fluid from the fluid pressure source, through said conduit means and said changeover valve when in a second position to the secondary face of the piston, said secondary circuit includes a plurality of channels formed in a wall of the cylinder.
Lockable differential gear having a clutch with a shiftable coupling half, a hydraulic actuator for operating said shiftable coupling half comprising a cylinder;
- a piston mounted for axial movement within the cylinder, said piston having a primary face and a secondary face;
- a piston rod projecting from said secondary face;
- a fluid pressure source;
- conduit means including a changeover valve having a first position for selectively circulating working fluid from the fluid pressure source through said conduit means and a primary circuit to act on the primary face of the piston;
- and a secondary circuit for circulating working fluid from the fluid pressure source, through said conduit means and said changeover valve when in a second position to the secondary face of the piston, said secondary circuit includes a plurality of channels formed in a wall of the cylinder.
Dependencies are inferred from the claim text.