HYDROSTATIC RADIAL PISTON MACHINE AND PISTON FOR A HYDROSTATIC RADIAL PISTON MACHINE

摘要

A radial piston machine and a piston for a radial piston machine include pistons that are movable in the radial direction and are guided along a lifting surface of a cam ring by a roller. The roller is hydrostatically supported by a pressure groove in a sliding bearing surface of a roller cage. The geometry of the pressure groove is configured such that both the leakage is reduced and the lateral support is improved by enlarging hydrostatic and hydrodynamic surface sections.

主权项

1. A hydrostatic radial piston machine, comprising:
a cylinder block defining a plurality of cylinder bores; and a plurality of pistons guided radially displaceably in the respective cylinder bores and configured to delimit a working space in each case with the cylinder bore, the pistons being supported on a cam ring in each case via a roller such that they carry out a stroke in the case of a relative movement between the cam ring and the cylinder block, wherein the roller is mounted hydrostatically such that it is configured to be rotated on a roller cage configured approximately as a cylinder segment, and a hydrostatic pressure groove formed in a plain bearing face, the hydrostatic pressure groove being in pressure medium connection with the respective working space, and wherein the pressure groove is positioned in such a way that a gap which opens during operation of the radial piston machine between the outer circumference of the roller and the plain bearing face does not pass, or passes only insubstantially, in pressure medium connection with the pressure groove.