Hydrostatic Axial Piston Machine

摘要

A hydrostatic axial piston machine (1) with a cylinder barrel (2) having at least one piston bore (3) in which is located a power unit piston (4) supported on a cam disk (18). A control surface (5) is stationary relative to the housing and is on a control base (6), against which control surface the cylinder barrel (2) is in contact. In the control base (6) there are a kidney-shaped inlet connection (8) and a kidney-shaped outlet connection (9). The sealing web surface on the control surface 5 on the control base (6) in the vicinity of the inlet connection (8) is reduced, so that in operation as a motor, when there is a pressurization of the inlet connection (8), a reduction of the hydrostatic relief force is achieved. In operation as a motor, a residual application of the cylinder barrel (2) against the control surface (5) from a hold-down force of a hold-down spring (24) that is in an operative connection with the cylinder barrel (2) and/or pressing cylinder compression forces is preserved. In addition or alternatively, the terminal areas of the kidney-shaped inlet connection (8) of the control base (6) have a transitional contour (K) in the shape of a flattened arc in the radially outer area.

主权项

1. A hydrostatic axial piston machine, comprising:
a cylinder barrel rotatable around an axis of rotation; at least one piston bore located in the cylinder barrel; a power unit piston located in the piston bore and supported on a cam disk so that it can move longitudinally; a control surface stationary relative to a housing and located on a control base, against which control surface the cylinder barrel is in contact; a kidney-shaped inlet connection and a kidney-shaped outlet connection in the control base; and a displacement chamber formed between the piston bore and the power unit piston, which during rotation of the cylinder barrel around the axis of rotation is placed in communication alternately with the inlet connection and the outlet connection, wherein the axial piston machine is operable as a pump and as a motor in a same direction of rotation of the cylinder barrel and a same direction of flow of the hydraulic fluid, wherein when the cylinder barrel is driven in pump operation, the axial piston machine takes in hydraulic fluid via the inlet connection and delivers it into the outlet connection, wherein when operated as a motor, the axial piston machine is driven by hydraulic fluid under pressure delivered by the inlet connection, wherein at least one of (i) a sealing web surface on the control surface on the control base in a vicinity of the inlet connection is reduced, so that in operation as a motor, when there is a pressurization of the inlet connection, a reduction of the hydrostatic relief force is achieved, and so that, in operation as a motor, a residual application of the cylinder barrel against the control surface from a hold-down force of a hold-down spring that is in an operative connection with the cylinder barrel and/or pressing cylinder compression forces is preserved, and/or (ii) wherein the terminal areas of the kidney-shaped inlet connection of the control base have a transitional contour in the shape of a flattened arc in the radially outer area.