Spacer expander

Details Spacer expander Spacer expander

2007-07-17

2007-07-17

Leslie, Michael (Department: 3745)

Expansible chamber devices

Piston

Nonmetallic portion

C277S473000, C277S477000

Reexamination Certificate

active

11358186

ABSTRACT:
In a combined oil ring having a spacer expander to be installed between a pair of upper and lower side rails, a plurality of axially protruding inner peripheral protruding portions are formed on the inner peripheral side of the spacer expander along its peripheral direction. The inner peripheral protruding portions press the inner peripheral surface of the side rails. On the outer peripheral side of the spacer expander, a plurality of slits are formed, and a plurality of connecting portions are located in the peripheral direction isolated by the slits. On the plurality of connecting portions, axially protruding outer peripheral protruding portions are formed.

REFERENCES:
patent: 4759266 (1988-07-01), Murray
patent: 5052698 (1991-10-01), Kimura
patent: 04-300467 (1992-10-01), None
patent: 05-087240 (1993-04-01), None
patent: 05-106734 (1993-04-01), None
patent: 06-081950 (1994-03-01), None
patent: 05-069289 (2005-03-01), None
patent: WO 2005/019706 (2005-03-01), None

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