US 5,964,467 AGranted

Oil control ring of two piece type for internal combustion engine

AssigneeRiken

InventorShinichi Hirata

Life of this patent

Estimating the term…

Loading patent…

Abstract

The oil control ring 1 is provided to attach in an annular groove 10 formed in a piston 2 for internal combustion engine. The spacer expander 4 comprises a base 8, a plurality of supports 6 and a plurality of arms 7. The supports 6 and arms 7 are integrally formed with the base 8 to extend from an outer periphery 8a or inner periphery 8b of the base 8. The supports 6 resiliently urge a side rail 5 mounted on the space expander 4 toward an upper surface 14 of the annular groove 10 so that during upward stroke of the piston 2, the supports 6 can be resiliently deformed to form between the side rail 5 and upper surface 14 of the groove 10 a radial passage through which oil scraped by the side rail can be drained. Each arm 7 is provided with a lug 8 to resiliently urge the side rail 5 in radial and outward direction.

Claims4

Dependent claims

An oil control ring attachable in an annular groove (10) formed in a piston (2) for internal combustion engine, said oil control ring including a spacer expander (4) and a side rail (5) mounted thereon so that said spacer expander (4) elastically urges said side rail (5) toward an inner wall (13) of a cylinder (3);

said spacer expander (4) comprising a base (8), a plurality of supports (6) and a plurality of arms (7), said supports (6) and arms (7) being integrally formed with said base (8) to extend from an outer or inner periphery (8a, 8b) of said base (8);
said supports (6) resiliently urging said side rail (5) toward an upper surface (14) of said annular groove (10) of said piston (2);
each of said arms (7) provided with a lug (9) for resiliently urging said side rail (5) in radial and outward direction;
and
said spacer expander(4) has its Z section including said base (8) and supports (6).

2 more elements

Dependencies are inferred from the claim text.