Bearing restricting device in swash plate hydraulic pump or motor

A swash plate hydraulic pump or motor comprising:

• a housing that includes concave arc surface;
• a shaft rotatably supported by the housing;
• a swash plate with a convex arc surface facing the concave arc surface;
• a support rod rotatably mounted in a bore disposed in the housing;
• a bearing positioned between the convex arc surface and the concave arc surface;
• and
• a restricting pin with one end rotatably received in a bore of the swash plate, an intermediate portion slideably received through a bore of the bearing, and an opposite end slideably received in a bore through the support rod.

A method of operating a swash plate hydraulic pump or motor, comprising the steps of:

• displacing hydraulic fluid by reciprocating pistons by rotating a shaft;
• adjusting a displacement of the pistons by varying an angle of a swash plate relative to a housing;
• keeping a bearing between a convex arc surface of the swash plate and a concave arc surface of the housing by locking the bearing to an intermediate portion of a restricting pin;
• the keeping step including a step of rotationally supporting one end of the restricting pin in a bore of the swash plate;
• and
• the keeping step including slideably receiving an opposite end of the restricting pin through a bore of a support rod rotatably mounted in the housing.