PISTON FOR INTERNAL COMBUSTION ENGINE

Title:

PISTON FOR INTERNAL COMBUSTION ENGINE

Document Type and Number:

WIPO Patent Application WO/2011/115152

Kind Code:

A1

Abstract:

Provided is an aluminium alloy piston (64) for an internal combustion engine. In the internal combustion engine, the piston (64) moves back and forth in a sleeve (62) made of grey cast iron or an aluminium alloy. Further, the piston (64), which is made from silver, silver alloy, copper, or copper alloy, is provided with a film (72) that covers the scoring (68) that is formed on the piston skirt (66) and there are undulations in the surface of the film (66), formed from protrusions (80) and depressions (78). There is a difference of 8-15 μm between the lowest point of the depressions (78) and the highest point of the protrusions (80). The pitch of adjacent protrusions corresponds to the pitch of projections in the scoring (68). In addition, the arithmetic average roughness (Ra) of the protrusion peaks does not exceed 60 nm.

Inventors:

TAKADA RYOTARO (JP)
SARUYAMA MAYUMI (JP)
TSUJII YOSITAKA (JP)

Application Number:

PCT/JP2011/056164

Publication Date:

September 22, 2011

Filing Date:

March 16, 2011

Export Citation:

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Assignee:

HONDA MOTOR CO LTD (JP)
TAKADA RYOTARO (JP)
SARUYAMA MAYUMI (JP)
TSUJII YOSITAKA (JP)

International Classes:

F02F3/00; F02F1/08; F02F1/20; F02F3/10; F16J1/01

Foreign References:

JP2003013799A	2003-01-15
JP2008215222A	2008-09-18
JP2008231943A	2008-10-02
JP2009068584A	2009-04-02
JP2003013802A	2003-01-15

Other References: