Combined oil control ring
US9303765B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 21, 2014 |
| Grant date | Apr 5, 2016 |
| Priority date | — |
| Expiry date | Oct 2, 2034 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16J9/203
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A combined oil control ring comprising a pair of circular side rails each having a gap, and a spacer expander longitudinally sandwiched by the side rails, which has seating tabs for pushing inner surfaces of the side rails on the inner side, a side rail-pushing surface of each seating tab being provided with one or more grooves extending substantially longitudinally; each of the side rail-pushing surfaces including the grooves being provided with a nitride layer, and the depth d (μm) of the grooves, the surface hardness h (micro-Vickers hardness HV0.1) of the nitride layer, and the thickness t (μm) of the nitride layer having micro-Vickers hardness HV0.1 of 700 or more meeting the relation of the0.05≦1000×d/(h×t)≦0.45 (1).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.