A hydrostatic axial piston machine is disclosed, in the housing of which a drive shaft is rotatably mounted about an axis of rotation. The housing comprises a pot-like housing part having a first abutment and a cover-like housing part having a second abutment. The two abutments are clamped against one another in a sealing manner. A first fitting pin is inserted precisely into a first fitting recess of the first abutment on the one hand and into a second fitting recess of the second abutment on the other hand. A second fitting pin is provided on a side opposite the axis of rotation, which is inserted precisely into a third fitting recess of the first abutment on the one hand and into a fourth fitting recess of the second abutment on the other hand. The second fitting recess has a radial widening relative to the axis of rotation, whereby the second fitting recess is a slotted hole and/or a fitting groove.

A hydrostatic axial piston machine is disclosed, in the housing of which a drive shaft is rotatably mounted about an axis of rotation. The housing comprises a pot-like housing part having a first abutment and a cover-like housing part having a second abutment. The two abutments are clamped against one another in a sealing manner. A first fitting pin is inserted precisely into a first fitting recess of the first abutment on the one hand and into a second fitting recess of the second abutment on the other hand. A second fitting pin is provided on a side opposite the axis of rotation, which is inserted precisely into a third fitting recess of the first abutment on the one hand and into a fourth fitting recess of the second abutment on the other hand. The second fitting recess has a radial widening relative to the axis of rotation, whereby the second fitting recess is a slotted hole and/or a fitting groove.

One embodiment of a hub feed oil system is used to provide oil to components on the rotating side of an aircraft rotor hub system. A pump is configured so that a portion of the pump rotates with the rotating portion of the rotor system and a portion of the pump is fixed relative to the static portion of the rotor system. Multiple oil channelswith the provision of a variety of different pressuresmay be provided.

An axial piston machine in a slanted axis design with constant displacement volume is disclosed. A tapping opening is arranged in the first reversing region, which can be brought into fluid exchange connection with one of the openings in each case by rotating the cylinder drum. The tapping opening is permanently connected to a pre-compression chamber via a connection channel, which runs completely in the housing. The pre-compression chamber is formed closed with the exception of the connection channel, wherein it is arranged completely in the housing.

An axial piston machine in a slanted axis design with constant displacement volume is disclosed. A tapping opening is arranged in the first reversing region, which can be brought into fluid exchange connection with one of the openings in each case by rotating the cylinder drum. The tapping opening is permanently connected to a pre-compression chamber via a connection channel, which runs completely in the housing. The pre-compression chamber is formed closed with the exception of the connection channel, wherein it is arranged completely in the housing.

A pump or fluid-powered motor may include a housing defining an inlet and an outlet, internal pump components arranged within the housing and operably coupled to a drive shaft having a mechanical coupling mechanism adapted to engage a corresponding mechanical drive mechanism at a mount location. A flange may be secured to the housing and adapted for securing the pump to the mount location and may include a rectangular plate having a through bore and a substantially cylindrical pilot extending therefrom, defining a first diameter, and including a peripheral groove. The flange may also include a plurality of bolt holes extending through the rectangular plate and arranged on a bolt circle with a second diameter. The second diameter may be approximately 240 mm and a distance from a top pair of the bolt holes to a bottom edge of the rectangular plate may be approximately 200 mm.

A pump or fluid-powered motor may include a housing defining an inlet and an outlet, internal pump components arranged within the housing and operably coupled to a drive shaft having a mechanical coupling mechanism adapted to engage a corresponding mechanical drive mechanism at a mount location. A flange may be secured to the housing and adapted for securing the pump to the mount location and may include a rectangular plate having a through bore and a substantially cylindrical pilot extending therefrom, defining a first diameter, and including a peripheral groove. The flange may also include a plurality of bolt holes extending through the rectangular plate and arranged on a bolt circle with a second diameter. The second diameter may be approximately 240 mm and a distance from a top pair of the bolt holes to a bottom edge of the rectangular plate may be approximately 200 mm.

A pump or fluid-powered motor may include a housing defining an inlet and an outlet, internal pump components arranged within the housing and operably coupled to a drive shaft having a mechanical coupling mechanism adapted to engage a corresponding mechanical drive mechanism at a mount location. A flange may be secured to the housing and adapted for securing the pump to the mount location and may include a rectangular plate having a through bore and a substantially cylindrical pilot extending therefrom, defining a first diameter, and including a peripheral groove. The flange may also include a plurality of bolt holes extending through the rectangular plate and arranged on a bolt circle with a second diameter. The second diameter may be approximately 240 mm and a distance from a top pair of the bolt holes to a bottom edge of the rectangular plate may be approximately 200 mm.

A pump or fluid-powered motor may include a housing defining an inlet and an outlet, internal pump components arranged within the housing and operably coupled to a drive shaft having a mechanical coupling mechanism adapted to engage a corresponding mechanical drive mechanism at a mount location. A flange may be secured to the housing and adapted for securing the pump to the mount location and may include a rectangular plate having a through bore and a substantially cylindrical pilot extending therefrom, defining a first diameter, and including a peripheral groove. The flange may also include a plurality of bolt holes extending through the rectangular plate and arranged on a bolt circle with a second diameter. The second diameter may be approximately 240 mm and a distance from a top pair of the bolt holes to a bottom edge of the rectangular plate may be approximately 200 mm.

A pump or fluid-powered motor and a flange may include a pump housing defining an inlet and an outlet and internal pump components arranged within the housing and operably coupled to a drive shaft extending out of an end of the housing and defining a longitudinal axis. A pump flange may be arranged on the end of the housing and comprising a generally rectangular plate having a plurality of bolt holes. The pump flange may also include a pilot projection defining a pilot diameter, a torque pin feature, and a through bore with the drive shaft extending therethrough. The plurality of bolt holes may define a rectangular pattern with an X-spacing a Y-spacing. The torque pin feature may be arranged a distance from the longitudinal axis and on the Y-axis, wherein a ratio of the distance to the pilot diameter ranges from approximately 0.50 to approximately 0.70.