Patent ID: 7513189
Filing Date: 2009-04-07
Classification: F04B

Abstract:
1. Hydrostatic piston machine with a cylinder drum, in which a first group of cylinder bores and a second group of cylinder bores are made, the cylinder bores of the first group being connectable to a first hydraulic circuit and the cylinder bores of the second group being connectable to a second hydraulic circuit, the cylinder drum being connected to a drive shaft in a manner locked against relative rotation in order to transmit a rotary movement, and the cylinder bores of the first group and the cylinder bores of the second group being made in the cylinder drum on a common divided circle, the cylinder bores of the first group are being connectable to the first hydraulic circuit via first connecting ducts which open out at an end face of the cylinder drum with a first distance (R 1 ) from the longitudinal axis of the cylinder drum, and the cylinder bores of the second group are being connectable to the second hydraulic circuit via second connecting ducts which open out at the end face of the cylinder drum with a different, second distance (R 2 ) from the longitudinal axis of the cylinder drum, a first kidney control port being connected to the first hydraulic circuit is made in a control plate and extends along a circular arc with a first radius (R 1 ′) corresponding to the first distance (R 1 ) of the mouths of the first connecting ducts from the longitudinal axis of the cylinder drum, a second kidney control port being connected to the second hydraulic circuit is made in the control plate and extends along a circular arc with a different, second radius (R 2 ′) corresponding to the second distance (R 2 ) of the mouths of the second connecting ducts from the longitudinal axis of the cylinder drum, a third kidney control port being connected to the first circuit is made in the control plate and extends along the circular arc with the first radius (R 1 ′), and a fourth kidney control port being connected to the second circuits made in the control plate and extends along the circular arc with the second radius (R 2 ′).