Patent ID: 6371061
Filing Date: 2002-04-16
Classification: F01M,F01P,F02F,F05C

Abstract:
A piston assembly for an internal combustion engine, comprising:a piston head supported for reciprocal movement in a piston cylinder between a lowered position and a raised position, said piston head having an open bottom cooling gallery formed in a bottom surface of said piston head; a pair of pin bosses depending from said piston head and having pin bores for supporting a wrist pin of a connecting rod; a piston skirt coupled to said pin bosses for said reciprocal movement with said piston head; a stationary oil spray nozzle extending into said piston skirt and having an outlet positioned for directing a flow of cooling oil along a path toward said cooling gallery; and an oil deflector shield carried by said piston skirt and movable with said piston head relative to said stationary oil spray nozzle between a lowered deflecting position in the path of the cooling oil to substantially obstruct the flow of cooling oil to the cooling gallery and to direct the obstructed flow of cooling oil onto said pin bosses when the piston head is moved to said lowered position, and to a raised unobstructing position substantially out of the path of the flow of cooling oil to cause the cooling oil to be directed into the cooling gallery when the piston head is moved toward said raised position.