Lubrication system for a pin joint of an engine piston, an engine piston, and a method of lubricating a pin joint of an engine piston

An engine piston assembly comprising:

• a piston body defining:
• a gudgeon pin aperture;
• a piston pooling cavity extending radially outward from the gudgeon pin aperture and defining a channel that extends parallel to a wrist axis defined by the gudgeon pin aperture;
• a piston cooling gallery extending in a circumferential direction about a piston axis of the piston body;
• and
• a piston lubrication passage extending between the piston cooling gallery and the piston pooling cavity;
• and
• a pin journal received in the gudgeon pin aperture of the piston body and defining:
• a journal aperture in fluid communication with the piston pooling cavity;
• and
• a journal pooling cavity in fluid communication with the journal aperture.

A method of lubricating a pin joint of an engine piston, the method comprising:

• receiving, by a piston cooling gallery of the engine piston, a lubricant;
• providing, by a piston lubrication passage of the engine piston that extends from the piston cooling gallery, the lubricant to a piston pooling cavity of the engine piston that extends radially away from a gudgeon pin aperture of the engine piston;
• and
• providing the lubricant to a gudgeon pin disposed within the gudgeon pin aperture by passing the lubricant through a journal lubrication aperture of a journal disposed within the gudgeon pin aperture.