Axial piston machine

An axial piston machine comprising:

• a rotor having a shaft rotatably mounted in a housing;
• a plurality of cylinders arranged annularly around the rotor;
• a plurality of pistons each disposed within each of the plurality of cylinders, the plurality of pistons structured and arranged to selectively translate within each of the plurality of cylinders;
• wherein each of the plurality of cylinders are in operative communication with i) an inlet opening defined in a cylinder head and ii) at least one outlet opening defined in the housing;
• an auxiliary outlet rotary slide valve operatively connected to the shaft in a rotationally fixed manner, wherein the auxiliary outlet rotary slide valve includes an auxiliary outlet rotary opening structured and arranged to connect to a vent duct of one of the plurality of cylinders, based on an angle of rotation, to vent the one of the plurality of cylinders;
• wherein at least a portion of the auxiliary outlet rotary slide valve comprises a material configured to reduce a sliding friction resistance, the material comprising a carbon containing material or a polymer containing material;
• wherein the auxiliary outlet rotary slide valve includes a metal pot-shaped body having a polymer coating;
• wherein the polymer coating has a matrix of a plastic of polymeric polyimide/amide material, the matrix having a composition of:
• 5-25% by volume of an aluminium powder;
• 2-8% by volume of a fluoropolymer;
• 2-10% by volume of a silane;
• and
• a remainder that is without contaminations.