Patent ID: 6182630
Filing Date: 2001-02-06
Classification: F02B,F02F,F05C,Y02T

Abstract:
An articulated piston (20) for an internal combustion engine comprising:an upper crown (22) having an upper surface (70), a lower surface (82), and an outer sidewall (68) that defines an outer diameter;a lower crown (24) having an upper surface (90), a lower surface and an outer sidewall (88) and at least one downwardly projecting pin boss (31) for receiving a wrist pin;said upper and lower crowns (22,24) are fabricated from ferrous-based metallic material and are joined together by a plurality of fasteners (50) to form a crown portion and including a separate skirt member (26) fabricated of aluminum-based material coupled in articulated manner to said crown portion;said upper crown (22) having a lower (81) surface including a downwardly projecting, generally annular ridge (80) having at least one locating feature (40);said lower crown (24) having an upper surface (90) including an upwardly projecting, annular ridge (92) for mating engagement with said upper ridge (80) of said upper crown (22);wherein at least one of said upper and lower ridges (80,92) has a boss (32) located adjacent thereto for forming a fastener bore (34,38); andwherein said boss (32) is located radially outwardly of said at least one of said upper and lower ridges (80,92).