Piston rings and their manufacture

Details Piston rings and their manufacture Piston rings and their manufacture

1985-08-12

1987-04-07

Goldberg, Howard N.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Forming plural articles

291566, 29DIG31, 277215, 277220, 277193, 277DIG6, 2642972, 264DIG67, 419 66, 425DIG42, B28B 306, B23P 1506

Patent

active

046559833

ABSTRACT:
A piston ring is formed by annular upper and lower parts which contact one another at respective surfaces normal to the axis of the piston ring. The parts can be injection moulded from thermoplastics materials with the parts themselves having no re-entrant portions, so allowing quick and easy manufacture, but with the parts together defining re-entrant portions such as a spring-receiving recess at the inward side of the ring or a pair of spaced oil control rails at the outward side of the ring.

REFERENCES:
patent: 1219270 (1917-03-01), Dunham
patent: 1857254 (1932-05-01), Morton
patent: 2047806 (1936-07-01), Swanson et al.
patent: 2111291 (1938-03-01), Mason
patent: 2918340 (1959-12-01), Knoeble
patent: 3561087 (1971-02-01), Koehler
patent: 3655208 (1972-04-01), Walker
patent: 4465515 (1984-08-01), Mundorff
patent: 4497497 (1985-02-01), Berti

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