Patent ID: 6263849
Filing Date: 2001-07-24
Classification: F01L

Abstract:
A hollow poppet valve for use in an internal combustion engine, said poppet valve comprising a stem portion, a tip portion, a cap portion, and a flared fillet portion defining a transition region between said stem portion and said cap portion; said flared fillet portion having a wall thickness, and a downwardly-extending, generally cylindrical portion defining an inside fillet radius; one of said generally cylindrical portion and said cap portion defining a seat face, adapted for sealing engagement with a valve seat; one of said generally cylindrical portion and said cap portion defining a generally cylindrical, internal surface, and the other of said generally cylindrical portion and said cap portion defining a generally cylindrical, external surface, said internal and external surfaces being generally concentric and closely spaced apart; characterized by:(a) said inside fillet radius being greater than about 0.3 times said wall thickness;(b) a weld consuming substantially the entire axial extent of the interface of said internal and external surfaces; and(c) said generally cylindrical portion and said cap portion cooperating to define an annular, horizontal interface disposed immediately radially inward from said interface of said internal and external surfaces.