Method for manufacturing internal combustion engine piston

Details Method for manufacturing internal combustion engine piston Method for manufacturing internal combustion engine piston

2005-05-26

2008-09-09

Bryant, David P. (Department: 3726)

Metal working

Method of mechanical manufacture

Prime mover or fluid pump making

C029S888047, C029S888049, C029S888070, C029S888072, C029S888074, C092S16500R, C092S166000

Reexamination Certificate

active

07421782

ABSTRACT:
A method is provided for efficiently manufacturing a high quality internal combustion engine piston having an annular cavity allowing for good circulation of cooling fluid. An annular groove is formed at the circumferential edge of the top face of a piston crown, or at the top of the exterior circumferential face of the crown, and an annular protruding strip is formed as a continuation of an edge of the opening of the annular groove. The protruding strip is bent in the direction of the opening of the annular groove by bringing to bear a pressure roller11, while rotating the main piston body. Consequently, the opening of the annular groove is closed, whereby an annular cavity for circulating cooling fluid is formed so as to surround a pressure receiving recess.

REFERENCES:
patent: 4765167 (1988-08-01), Sampson
patent: 6763575 (2004-07-01), Meigs et al.
patent: 7104183 (2006-09-01), Huang
patent: 2004/0168319 (2004-09-01), Mielke

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