Hydraulic actuator, especially for selection shaft of three-step planetary gear; has first piston moving in guide formed inside second cylindrical piston, formed as hydraulic cylinder

摘要

The actuator (12) has a first piston (24), which moves in a piston guide between two walls (26,27). The piston guide and the walls are arranged inside a second piston (25), which moves in a second piston guide between two further walls (16,17). The second piston is shaped as a sleeve, whose outer cylinder forms the inner surface of a hydraulic cylinder and whose inner cylinder forms the guide for the first piston.