Betätigungseinrichtung für einen hydraulischen Hauptzylinder

摘要

For an automatic hydraulic pressure generator in which a hydraulic master cylinder driven by a computer-controlled motor lets in or takes out a friction clutch, an operation device is provided that can make the piston rod of the hydraulic master cylinder operate at high torque and at high speed and further that is advantageous in durability of its conversion mechanism from rotary motion to linear motion. The operation device 1 for operating a hydraulic master cylinder 3 by motor drive comprises a slider 15 driven by a motor 4 to rotate around a stationary shaft 7 through an actuator gear train 18, 23, 27 for speed reduction; a female screw 19 formed on an inner circumference of said slider 15; a male screw 21 provided on an outer circomference of said stationary shaft 7 and meshing with said female screw 19; a sleeve 9 fixed to a piston rod 6 of said hydraulic master cylinder 3 and being slidable along said stationary shaft 7 in the axial direction; and a slider bearing 16 for coupling said sleeve 9 with said slider 15 so that said sleeve 9 may be rotatable relatively to and movable integrally with said slider 15 in the axial direction.