Title:
筒内噴射式2サイクルエンジン
Document Type and Number:
Japanese Patent JP4046824
Kind Code:
B2
Abstract:
A piston and piston ring assembly has a compression ring and a lubrication control ring. The compression ring substantially seals a combustion chamber from a crankcase chamber. The lubrication control ring is configured with a reverse-taper end surface and a wiping edge. The reverse-taper end surface allows the lubrication control ring to leave a thin lubricant coat on a cylinder wall during a piston downstroke. The wiping edge pulls lubricant upward toward the compression ring during a piston upstroke. The combination of the elements and the elements on their own result in enhanced lubrication of the compression ring and thereby increase the life of the piston ring and reduce the wear on the ring and the cylinder bore.
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Inventors:
Kazutoshi Takashima
Application Number:
JP35452397A
Publication Date:
February 13, 2008
Filing Date:
December 24, 1997
Export Citation:
Assignee:
Yamaha Marine Co., Ltd.
International Classes:
F02B17/00; F02B23/10; F02F5/00; F16J9/20
Domestic Patent References:
| JP58056138U | ||||
| JP49128911U | ||||
| JP63048953U |
Attorney, Agent or Firm:
Haruka International Patent Office