Axial piston pump mounting flange configuration

A hydraulic pump or motor comprising:

• a shaft defining a longitudinal axis, a Y-axis extending upwardly and orthogonally from the longitudinal axis, and an X-axis extending orthogonally to the longitudinal axis, and the Y-axis;
• a housing defining a first longitudinal end, a second longitudinal end, and a cavity that extends from adjacent the first longitudinal end toward the second longitudinal end;
• a plurality of mechanical components including one hydraulic interacting component that are disposed in the cavity;
• and
• an inlet and an outlet that are disposed near the second longitudinal end and that are in communication with the cavity;
• wherein a mounting flange is disposed at the first longitudinal end of the housing, the shaft extends from the cavity past the first longitudinal end of the housing and through the mounting flange, the mounting flange having a square shape with corners and defining a plurality of bolt receiving slots arranged generally in respective corners of the square shape, the plurality of bolt receiving slots having radius centers arranged in a square pattern having four sides each defined by an X dimension and at least one of the bolt receiving slots defines a slot width, and a ratio of the X-dimension to the slot width ranges from 7.00 to 10.2.

A hydraulic pump assembly comprising:

• a shaft defining a longitudinal axis, a Y-axis extending upwardly and orthogonally from the longitudinal axis, and an X-axis extending orthogonally to the longitudinal axis, and the Y-axis;
• a housing defining a first longitudinal end, a second longitudinal end, and a cavity that extends from adjacent the first longitudinal end toward the second longitudinal end;
• a plurality of mechanical components including at least one hydraulic interacting component that are disposed in the cavity;
• and
• an inlet and an outlet that are disposed near the second longitudinal end, and which are in communication with the cavity;
• wherein a mounting flange is disposed at the first longitudinal end of the housing, the shaft extends from the cavity past the first longitudinal end of the housing and through the mounting flange, the mounting flange comprising a rectangular shape and defining a plurality of fastener receiving apertures having radius centers arranged in a rectangular pattern within a boundary of the rectangular shape and with sides parallel to one of the X or Y axis wherein a spacing of the fastener receiving apertures along the X-axis is equal to an X dimension, and a pilot projection that extends longitudinally away from the mounting flange or a pilot recess extending longitudinally into the mounting flange, defining a pilot projection diameter or a pilot recess diameter, and a ratio of the X dimension to the pilot projection diameter ranges from 1.07 to 1.11, or a ratio of the X dimension to the pilot recess diameter ranges from 1.07 to 1.11.