Three-piece type oil ring assembly

Details Three-piece type oil ring assembly Three-piece type oil ring assembly

1991-07-02

1993-03-16

Cuchlinski, Jr., William A.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277141, 277216, 267 15, F16J 906

Patent

active

051938200

ABSTRACT:
A three-piece type oil ring assembly adapted to be fitted in an oil ring groove of a piston disposed within a cylinder comprises a spacer expander in the form of a gapped annulus made of section steel having substantially H-shaped radial cross section, and a pair of upper and lower side rails, each in the form of a gapped flat annulus. The spacer expander includes an axially protruding outer portion disposed on the outer circumference thereof and facing the inner surface of the cylinder, an axially protruding inner portion disposed on the inner circumference thereof and facing the innermost wall of the oil ring groove, and an axially flat connecting portion extending between the outer and inner protruding portions. The outer protruding portion has side rail supporting surfaces formed on the upper and lower ends thereof so as to be inclined toward the axially symmetrical centerline thereof along the radial direction at an acute angle with the radial direction. The inner protruding portion has upper and lower side rail pressing surfaces formed so as to be inclined outwardly along the direction from the upper and lower end of the inner protruding portion toward the intersection thereof with the connecting portion at an acute angle with the axial direction. Alternatively, the upper and lower side rail supporting surfaces are not inclined but extending radially for a length of 20% or less of the entire radial length of the spacer expander.

REFERENCES:
patent: 2970022 (1961-01-01), Anderson
patent: 3481611 (1969-12-01), Stratton
patent: 3606355 (1971-09-01), Minegishi
patent: 3663030 (1972-05-01), Miyamoto
patent: 3738668 (1973-06-01), Minegishi
patent: 3768818 (1973-10-01), Minegishi
patent: 4429885 (1984-02-01), Chiba et al.
patent: 4762329 (1988-08-01), Kooroki
patent: 5052698 (1991-10-01), Kimura

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