Aluminum base alloy piston for internal combustion engines with

Details Aluminum base alloy piston for internal combustion engines with Aluminum base alloy piston for internal combustion engines with

1985-02-07

1987-01-06

Michalsky, Gerald A.

Expansible chamber devices

Piston

Open-ended hollow skirt type

291565R, 92222, 123193P, F02F 300

Patent

active

046337644

ABSTRACT:
A cast aluminum piston for internal combustion engines having mechanically compacted inner boss bore faces, the structure of the aluminum material disposed below these inner faces having a grain pattern orientated in the circumferential direction of the boss bore over a radial depth of at least 0.1 mm and preferably 0.2 mm. This grain pattern is achieved by rolling at a temperature of at least 350 degrees C. up to 400 degrees C. with simultaneous expansion of the bore diameter by about 0.2 to 0.5 mm.

REFERENCES:
patent: 3324772 (1967-06-01), Wittstock
patent: 4124010 (1978-11-01), Fiedler

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