Piston ring having shape of an ellipse or an elongated circle

Details Piston ring having shape of an ellipse or an elongated circle Piston ring having shape of an ellipse or an elongated circle

1983-05-16

1986-02-18

Garrett, Robert E.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277217, 277220, 92177, F16J 1532

Patent

active

045709459

ABSTRACT:
A piston ring for an internal combustion engine having a piston and a cylinder of an elliptical or oblong circular cross-sectional shape is divided into two or more segments which are connected end to end in a ring. Each of the end-to-end joints between the neighboring segments is so designed as to provide an adequate surface pressure of the piston ring against the cylinder wall when installed in a cylinder. In one embodiment, the piston ring comprises two arc segments each of which has two inward projections projecting from both ends of the segment, respectively. In the installed state, the two inward projections of one arc segment abut against the inward projections of the other segment, respectively, in such a manner that an abutting pair of the inward projections at each joint produce a force which tends to increase a gap clearance between the ends of the segments. In another embodiment, the piston ring comprises two arc segments and two rectilinear segments disposed, in parallel with each other, between the two arc segments to form an oblong circular ring shape. In the installed state, both ends of each arc segment is compressed between the two rectilinear segments so that the two arc segments push the rectilinear segments outwardly so as to increase the distance between the rectilinear segments.

REFERENCES:
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patent: 2073500 (1937-03-01), Sopp
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patent: 2420921 (1947-05-01), Waldes
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patent: 2766085 (1956-10-01), Muller
patent: 3346252 (1967-10-01), Saylor
patent: 3391943 (1968-07-01), Riley
patent: 3738669 (1973-06-01), Andersen et al.
patent: 4256067 (1981-03-01), Fukui

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