Combined oil control ring
AssigneeRiken
InventorsTakayuki ICHIKAWA, Takuma SEKIYA
Life of this patent
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Abstract
A combined oil control ring comprising a pair of annular side rails each having a gap, and an axially corrugated spacer expander arranged between the side rails; the corrugated spacer expander having on the inside seating tabs for pushing inner peripheral surfaces of the side rails; the side-rail-pushing surface of each seating tab being provided with a nitrided layer; an entire surface of each spacer expander except for those provided with the nitrided layer being coated with a plating film; and the plating film having Vickers hardness HV0.01 of 300 or less.
Claims9
A combined oil control ring comprising a pair of annular side rails each having a gap, and an axially corrugated spacer expander arranged between said side rails;
- said corrugated spacer expander having on the inside seating tabs for pushing inner peripheral surfaces of said side rails;
- a side-rail-pushing surface of each seating tab being provided with a nitrided layer;
- an entire surface of each spacer expander except for those provided with said nitrided layer being coated with a plating film;
- and
- said plating film having Vickers hardness HV0.01 of 300 or less;
- wherein in an X-ray diffraction profile of a plating film surface, a texture coefficient of a (200) plane is 1.1 or more.
(canceled)
Dependencies are inferred from the claim text.