PISTON AND ENGINE - NIIGATA POWER SYSTEMS CO LTD

Title:

PISTON AND ENGINE

Document Type and Number:

WIPO Patent Application WO/2011/048864

Kind Code:

A1

Abstract:

Provided is a piston which reduces the amount of the air-fuel mixture to be discharged unburned and prevents piston rings from conglutinating due to heat. In the piston (2) on the outer circumferential surface of which a plurality of circumferential grooves for the piston rings are formed, the relation between the inner diameter (B) of the cylinder (1) and the distance (L) between the top surface of the piston and the top surface of the uppermost circumferential groove (4a) is set to satisfy L/B≤0.1 and a cooling chamber (5a) is formed in vicinity to the uppermost circumferential groove. The dead volume (S) partitioned by the piston, a cylinder liner (11), and the uppermost piston ring (3a) is reduced in size, which reduces the amount of the air-fuel mixture to be trapped therein and discharged unburned. Furthermore, the cooling chamber (5a) makes the uppermost piston ring less likely to conglutinate to the cylinder due to the heat load. Heat efficiency as an engine is also improved more than that in the past.

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Inventors:

GOTO SATORU (JP)
HASHIMOTO TORU (JP)
WATANABE KOICHI (JP)

Application Number:

PCT/JP2010/063442

Publication Date:

April 28, 2011

Filing Date:

August 02, 2010

Export Citation:

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Assignee:

NIIGATA POWER SYSTEMS CO LTD (JP)
GOTO SATORU (JP)
HASHIMOTO TORU (JP)
WATANABE KOICHI (JP)

International Classes:

F02F3/00; F02F3/22; F16J9/00; F16J10/02

Foreign References:

JPH064349U	1994-01-21
JPH03502720A	1991-06-20
JP2005194971A	2005-07-21

Other References: