Abstract: A lubricating mechanism of a pin connection pair of an internal combustion engine having a piston, a pin, and a connecting rod. The pin may be mounted in two pin seat portions of the piston such that the pin and one of the two pin seat portions form the pin connection pair. The lubricating mechanism may include a lubricating passage through which a lubricating medium is flowable and an oil outlet orifice communicating with the lubricating passage. The lubricating passage and the oil outlet orifice may be disposed in a piston top portion of the piston. An opening of the oil outlet orifice may face in an axial direction and may be disposed directly below a corresponding portion of the lubricating passage such that the lubricating medium is flowable via the opening directly to a gap defined between the connecting rod and a pin seat portion.

Abstract: A piston may include a splitting internal cooling runner, an end portion recessed inward to form a combustion chamber, and an annular internal cooling runner at least partially surrounding the combustion chamber. A wall of the annular internal cooling runner may partially protrude in a direction away from the end portion to form an annular splitting portion which divides the annular internal cooling runner into an outer half cavity and an inner half cavity.

Abstract: A piston may include a splitting internal cooling runner, an end portion recessed inward to form a combustion chamber, and an annular internal cooling runner at least partially surrounding the combustion chamber. A wall of the annular internal cooling runner may partially protrude in a direction away from the end portion to form an annular splitting portion which divides the annular internal cooling runner into an outer half cavity and an inner half cavity.

Abstract: A lubricating mechanism of a pin connection pair of an internal combustion engine having a piston, a pin, and a connecting rod. The pin may be mounted in two pin seat portions of the piston such that the pin and one of the two pin seat portions form the pin connection pair. The lubricating mechanism may include a lubricating passage through which a lubricating medium is flowable and an oil outlet orifice communicating with the lubricating passage. The lubricating passage and the oil outlet orifice may be disposed in a piston top portion of the piston. An opening of the oil outlet orifice may face in an axial direction and may be disposed directly below a corresponding portion of the lubricating passage such that the lubricating medium is flowable via the opening directly to a gap defined between the connecting rod and a pin seat portion.