Hydraulic actuator for servo-assisted mechanical transmission

摘要

A hydraulic actuator (15; 16; 17) for a servo-assisted mechanical transmission; the hydraulic actuator (15; 16; 17) is provided with: at least one actuation chamber (22) adapted to be filled with a pressurized control fluid; and a mobile piston (23) which laterally delimits the actuation chamber (22), slides inside the actuation chamber (22) under the bias of the pressurized control fluid, and is mechanically connected to a control shaft (20); the piston (23) presents: a joint (27), which is formed by metallic material and is mechanically connected to control shaft (20) to transmit the motion to the control shaft (20) itself; and at least one actuation portion (28), which is formed by molded plastic material, is integral with the joint (27) and laterally delimits the actuation chamber (22).