Internal combustion engine piston with two compression rings hav

Details Internal combustion engine piston with two compression rings hav Internal combustion engine piston with two compression rings hav

1987-04-24

1989-07-18

Garrett, Robert E.

Expansible chamber devices

With lubricating means

Piston has lubricant retaining or conducting means

277221, 277222, 123193P, F16J 914, F02F 500

Patent

active

048482129

ABSTRACT:
In a reciprocating piston engine, the piston has a top ring and a second ring received in respective ring grooves. The top ring has two end surfaces defining therebetween a gap the open area of which on the side of the combustion chamber, when the top ring abuts against the upper surface of the ring groove, is smaller than an open area of the gap facing a second land clearance when the top ring seats on the lower surface of the ring groove. As the top ring seats on the lower surface of the ring groove during the power stroke when the engine is operated at a high-speed, high-loaded condition, the greater open area of the gap rapidly introduces the combustion pressure into the second land clearance to thereby reduce oil consumption. When the engine works at a low-speed, low-loaded condition, the top ring abuts against the upper surface of the ring groove during the intake and compression strokes, where the smaller open area of the gap reduces the flow of oil from the crankcase to the combustion chamber.

REFERENCES:
patent: 2653065 (1953-09-01), Appleton
patent: 3494262 (1970-02-01), Holcombe
patent: 4111438 (1978-09-01), Longfoot
patent: 4189161 (1980-02-01), Grimm
patent: 4361337 (1982-11-01), Montes
patent: 4362136 (1982-12-01), Lipp
patent: 4475739 (1984-10-01), Nakajima et al.
patent: 4575107 (1986-03-01), Umegawa
Furuhama, S. et al. "Axial Movement of Piston Rings in the Groove", in ASLE Transactions, vol. 15, No. 4, pp. 278-287 (1972).

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