Title:
Combination oil control ring
Document Type and Number:
Japanese Patent JP6228452
Kind Code:
B2
Abstract:
A combined oil control ring comprising a pair of circular side rails (3) each having a gap, and a spacer expander (2) longitudinally sandwiched by the side rails, which has seating tabs (6) for pushing inner surfaces of the side rails on the inner side, a side rail-pushing surface (60) 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 meeting the relation of the formula 0.05 ¤ 1000 x d/(h x t) ¤ 0.45, wherein the surface hardness (h) of said nitride layer is 1100-1450.
Inventors:
Akira Kunimoto
Application Number:
JP2013268531A
Publication Date:
November 08, 2017
Filing Date:
December 26, 2013
Export Citation:
Assignee:
Riken Co., Ltd.
International Classes:
F16J9/26; F02F5/00; F16J9/06
Domestic Patent References:
| JP2013087816A | ||||
| JP2013113322A | ||||
| JP2006300224A | ||||
| JP2006292021A | ||||
| JP2003013958A | ||||
| JP61030758U | ||||
| JP2004060873A | ||||
| JP1078768U |
Foreign References:
| WO2011043364A1 | ||||
| WO2005040645A1 | ||||
| WO2014047703A1 | ||||
| US20070098589 |
Attorney, Agent or Firm:
Takaishi Tachibana