Abstract: An axial piston machine (1) is described, having a cylinder body (2) that is rotatable relative to a wobble plate (3) and in which several pistons (6) are arranged so as to be axially displaceable, the pistons being supported on a sliding-contact face (4) of the wobble plate 930 by means of slider shoes (9) articulated at the free ends of the pistons, wherein a pressure element (13) holding the slider shoes (9) on the sliding-contact face (4) is provided. It is desirable to reduce internal leakage in an axial piston machine of that kind. For that purpose, a wave spring element (16) is provided between each slider shoe (9) and the pressure element (13).

Abstract: A control system for a two way acting hydraulic servomotor wherein the servomotor is connected in the diagonal of a bridge circuit that includes four magnetic valves with a pair of the valves being normally open in a non-energized condition being connected to the one end of the servomotor and to the container and a second pair of the valves being normally closed in a deenergized condition being connected to the opposite end of the servomotor and to a pressure source. Circuitry provides pulse trains that are modulatable to control the operation of the magnetic valves and thereby the application of pressurized fluid to the opposite ends of the servomotor.

Abstract: The invention relates to a hydraulic system of the type in which a pump unit supplies pressurized fluid to a plurality of bidirectional servomotors. The system includes at least two modules each of which includes a bidirectional servomotor, a control valve and a compensating valve on the upstream side of the control valve. The pump unit includes a feedback loop having a throttle and a pump pressure regulator in series. Each of the modules has a sensing conduit connected to a common header which is operable to sense load pressure at the upstream side of the control valve for controlling the compensating valve in accordance with the load pressure. A pressure divider comparator valve is connected to the header and a point in the feedback loop between the throttle and the pump pressure regulator. The comparator valve is operable to compare the pressure at such point with the pressure in the header and to bleed pressurized fluid from that point to the tank to equalize the pressures.