Two-piece piston and method of manufacturing the same
AssigneeMetal Leve S.A. Industria e Comercio
InventorsGustavo F. Lorento, Jose A. C. Mendes, Joao A. D. Cullen
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Abstract
A method for the manufacture of a two-piece piston wherein the top portion and the pin boss portion, which define the piston head, are fabricated separately by cold or hot forming, casting or sintering, and joined together by welding such as, for instance, friction welding. The top portion and the pin boss portion may be of the same material or different materials, and obtained by the same method or by different methods.
Claims9
A method for manufacturing a two-piece piston for internal combustion engines, including a head having dependent therefrom a pair of pin bosses for bearing a piston wrist pin, and a skirt portion, comprising the steps of:
- forming a top portion comprising a circular upper plate and a substantially cylindrical leg depending from a periphery of said plate, said circular plate having an outer face and an inner face;
- forming a U-shaped pin boss portion, said boss portion including a base having ends and a pair of arms respectively connected at opposite ends of said base, said arms having holes for a wrist pin, the distance between said arms being less than the diameter of said top portion;
- positioning the base of said boss portion within said cylindrical leg;
- welding said base to said inner face of said top portion;
- and
- machining at least a portion of said substantially cylindrical leg and said wrist pin holes.
Dependencies are inferred from the claim text.