Hydraulic torque amplifier, particularly for steering devices

摘要

The invention relates to a hydraulic torque amplifier for steering devices or the like. The amplifier has a planetary type piston motor having a rotatable externally toothed inner gear and an orbitable, nonrotatable internally toothed outer gear. The amplifier has input and output shafts rotatably journaled in the amplifier housing in coaxial and axially spaced relation. The valving arrangement includes inner and outer sleeves with the input shaft being fixedly connected to the inner sleeve and the output shaft being fixedly connected to both the inner gear and the outer sleeve.