Adjustment Device for a Hydrostatic Piston Machine, and Hydrostatic Axial Piston Machine

摘要

An adjustment device for regulating torque of a hydrostatic piston machine includes a piston delimiting a chamber, a regulation valve, feedback and regulation springs, and a member. The valve has a displaceable slide to enable pressure medium to flow into or out of the chamber, a measurement surface acted on by pressure from the piston machine, and a bore open to the chamber, a side facing the chamber acted on by a chamber pressure in a first direction. The feedback spring exerts force on the slide in the first direction, depending on a position of the piston. The regulation spring exerts force on the slide in a second direction opposite the first direction. The member has a surface as large as the side of the bore such that the chamber pressure exerts force on the slide in the second direction.

主权项

1. An adjustment device for regulating a torque of a hydraulic piston machine with an adjustable swept volume, comprising:
an adjustment piston that defines an adjustment chamber; a regulation valve that includes:
a valve housing that defines a valve bore; anda valve slide arranged in the valve bore, and configured to control inflow and outflow of pressure medium to and from the adjustment chamber, the valve slide having a measurement surface configured and arranged to enable an operating pressure of the piston machine to act on the valve slide at the measurement surface in a first displacement direction;wherein the valve bore is open towards the adjustment chamber such that a face of the valve slide facing towards the adjustment chamber is acted on by an adjustment chamber pressure in the first displacement direction; at least one feedback spring that exerts a feedback force on the valve slide in the first displacement direction, the feedback force being dependent on a position of the adjustment piston; a regulation spring that exerts a further force on the valve slide in a second displacement direction opposite to the first displacement direction; and a compensation surface configured and arranged such that the compensation surface has an area as large as an area of the face of the valve slide acted on by the adjustment chamber pressure, and such that the adjustment chamber pressure generates a force on the valve slide in the second displacement direction.