Title:
CYLINDER AND PISTON RING ASSEMBLY
Document Type and Number:
WIPO Patent Application WO/2014/103940
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide a cylinder and piston ring assembly, wherein when combining a cylinder obtained from a hyper-eutectic Al-Si alloy with a hard carbon film-coated piston ring, both exhibit excellent abrasion resistance. On at least the outer circumferential sliding surface of the piston ring, a laminated coating film is coated, the laminated coating film: being obtained from a metal layer, a metal-containing hard carbon layer and a metal-free hard carbon layer, in order from the substrate side; and having a Martens hardness (indentation hardness) (HMs) of 5-13 GPa, an indentation elastic modulus (E) of 70-200 GPa, a deformation ratio (Rpe) represented by the ratio (Wp/We) of the plastic deformation energy (Wp) to the elastic deformation energy (We) of 0.45 or less, and a ratio (Tmf/Tm) of the thickness of the metal-free hard carbon layer (Tmf) to the thickness of the metal-containing hard carbon layer (Tm) of 2-8.
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Inventors:
KUNIMOTO AKIRA (JP)
MORONUKI MASAKI (JP)
MORONUKI MASAKI (JP)
Application Number:
PCT/JP2013/084279
Publication Date:
July 03, 2014
Filing Date:
December 20, 2013
Export Citation:
Assignee:
RIKEN KK (JP)
International Classes:
F16J9/26; C23C14/06; C23C16/26; F02F1/00; F02F5/00; F16J10/00
Domestic Patent References:
| WO2011051008A1 | 2011-05-05 | |||
| WO2012100847A1 | 2012-08-02 |
Foreign References:
| JP2013501897A | 2013-01-17 | |||
| JP2007170467A | 2007-07-05 | |||
| US20120205875A1 | 2012-08-16 |
Other References:
"ten-point-averaged roughness", JIS B0601, 2001
JIS B 063 8, 2001
See also references of EP 2940350A4
JIS B 063 8, 2001
See also references of EP 2940350A4
Attorney, Agent or Firm:
TAKAISHI Kitsuma (JP)
Kitsuma Takaishi (JP)
Kitsuma Takaishi (JP)
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