Combined oil control ring

Details Combined oil control ring Combined oil control ring

2007-12-11

2007-12-11

Patel, Vishal (Department: 3673)

Seal for a joint or juncture

Seal between relatively movable parts

Piston ring or piston ring expander or seat therefor

C277S465000, C277S472000

Reexamination Certificate

active

10536559

ABSTRACT:
In mounting a combined oil control ring in a ring groove formed in a piston, the combined oil control ring is mounted in a form that an opening between but ends of an oil ring body is widened. In such an operation, it is likely that a coil expander falls off the oil ring body thus making the mounting operation cumbersome. To overcome such a drawback, a relationship L1<L2is established. Here L1means a axial distance between open peripheries of the groove portion and L2means a maximum axial distance between peripheries of the groove portion.

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patent: 9-144881 (1997-06-01), None
patent: 2003-287128 (2003-10-01), None

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