Axial Piston Device

An axial piston device, comprising:

• a cylinder block rotatable integrally with a rotary shaft and having a plurality of cylinder chambers in a region surrounding the rotary shaft;
• a plurality of pistons each slidably contained in a corresponding one of the plurality of cylinder chambers;
• and
• a support configured to position respective protruding ends of the plurality of pistons,
• wherein:
• the cylinder block has a port face orthogonal to an axis of the rotary shaft,
• the cylinder block has a plurality of cylinder ports at the port face that are each continuous with a corresponding one of the plurality of cylinder chambers,
• the axial piston device further comprises a pair of supply/discharge ports adjacent to the port face, each in a shape of a segment of a circle around the rotary shaft, and configured to supply and discharge a fluid through the plurality of cylinder ports in response to the rotation of the cylinder block, and
• the plurality of cylinder ports each have a central point corresponding to a center of gravity in a cross section of a flow path at the cylinder port and are, as viewed along the axis, adjacent to one another along an imaginary circle around the axis, the imaginary circle passing through the respective central points of the plurality of cylinder ports, such that each adjacent two of the plurality of cylinder ports are apart from each other by a first distance along the imaginary circle which first distance differs from a second distance along the imaginary circle by which second distance any other adjacent two of the plurality of cylinder ports are apart from each other.