Piston ring set for reciprocating engines

Details Piston ring set for reciprocating engines Piston ring set for reciprocating engines

1996-11-21

1998-07-14

Cuchlinski, Jr., William A.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277221, 277223, F16J 914, F16J 920, F16J 928

Patent

active

057792437

ABSTRACT:
A set of split piston rings for use in a reciprocating engine is disclosed which includes a top ring, an intermediate ring and a scraper ring. The top ring has a first L-shaped end portion which covers two adjacent surfaces of a generally rectangularly shaped second end portion to form a lap joint having an internal air gap which extends between a downwardly opening slot at one end of the lap joint and an upwardly opening slot at the other end thereof. The intermediate ring includes a radially outer surface which forms an arc shaped taper from an upper surface of the ring downwardly and a outwardly to a lower surface thereof. The taper allows the outer surface to slide relatively freely over lubricating oil deposited on a cylinder wall without dragging an excessive amount of oil upwardly during an upward piston movement. The scraper ring includes a continuous friction reducing coating on upper, outer and lower surfaces of a skirt of the ring which maintains its friction reducing character long after the outer surface coating is worn away by rubbing upon a cylinder wall. The coating also enhances the oil wiping action of the scraper ring and remains effective after the outer coating is worn away.

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