Axial piston machine of oblique-axle construction with tiltable cylinder

Abstract

An axial piston machine has a control mirror body with a cylinder drum adjustable in both directions from a middle position with zero speed stroke of the pistons. An orifice in a guide surface (which at a given time is connected with a suction duct and a pressure duct) is divided into a pair of orifices connected via connecting ducts with the respective duct. The pair of orifices are symmetrical in the direction of tilt of the mirror member with its middle position in the guide surface. The orifice of each pair which at a given time is located against a momentary tilting direction and not covered by the mirror member is disconnected by a closing device from the associated suction or pressure duct. The constructively possible area of tilt of the mirror member and thereby of the cylinder drum is considerably enlarged. The control mirror member need not cover the entire pressure-side aperture of the guideway in every position of tilt. The invention has utilized the realization that in the middle position of the cylinder drum, that is, when the pistons do not carry out a stroke, neither does a conveyor current occur and that this results in an area in which all orifices in the guideway which lead to the suction and pressure duct may be closed simultaneously without disadvantage. In a practical embodiment of the invention the orifices of each pair of orifices in the guide surface are spaced from each other in the direction of tilt so that in the middle position (zero stroke position) of the control mirror member none of the orifices is connected with the ducts to the control ports in the mirror member.