Valve Unit, Capacity Control System and Axial Piston Machine with Such

Abstract

The invention relates to a hydraulic valve unit for the power or torque regulation comprising a first valve having a control piston displaceably supported in a first valve housing and a second valve coaxially arranged to the first valve and having a pressure piston displaceably supported in a second valve housing. A working pressure applied to a working connection can be reduced to a control pressure applied to a control connection by means of the valve unit in dependence on the position of the control piston. The control piston is preloaded by a setting spring arranged in the first valve. In accordance with the invention, the control piston and the pressure piston are connected to one another with force transmission by an elastic element, with the elastic element being adapted to transmit a force acting on the pressure piston onto the control piston. A first characteristic spring for generating a characteristic for the power or torque regulation is additionally arranged between the control piston and the pressure piston, with the first characteristic spring being adapted to exert a force from a specific displacement of the pressure piston by a first distance onward. The invention further relates to a power regulation system having a valve unit in accordance with the invention and an axial piston machine having such a power regulation system.

Dependencies are inferred from the claim text.