DEVICE FOR PRODUCING PRESSURE PULSE SEQUENCES FOR USE IN HYDRAULIC SERVOMOTORS AND METHOD FOR PRODUCING LINEAR OR ROTATING MOTIONS BY MEANS OF THESE PRESSURE PULSE SEQUENCES

摘要

Linear or rotary vibrations are produced by hydraulic forces in servo-motors, by feeding to the hydraulic servo-motors a series of hydraulic pressure in pulses. This is done by connecting rapidly and alternately a pipe leading to the servo-motor to the hydraulic pressure and return pipes. Where th servo-motor is double-acting, the pressure impulses can be applied to the opposite sides of the motor in antiphase. At each changeover, a quantity of oil under pressure can be fed to the servo-motor slightly large than that discharged to the return pipe. The actual pressure can be varied during an impulse, so that the amplitude of the vibrations can be controlled.