Internal-combustion engines – Particular piston and enclosing cylinder construction – Piston
Patent
1996-07-22
1998-07-21
McMahon, Marguerite
Internal-combustion engines
Particular piston and enclosing cylinder construction
Piston
F02F 500
Patent
active
057822174
ABSTRACT:
A water-cooled, two-stroke crankcase compression internal combustion engine for powering a motor vehicle. The engine includes a piston, piston rings, and cylinder bore arrangement that are constructed to inhibit piston ring sticking by cooling the piston ring gaps by holding them against rotation and spraying fuel from a fuel injector toward the gap for cooling it. In addition, overheating of the small end of the connecting rod is inhibited by surface treating portions of the piston to render them harder and less heat conductive. Scuffing of the piston, piston rings, and cylinder bore are reduced by surface treating the area of the head of the piston around the ring grooves so as to trap and retain lubricant.
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Patent Abstracts of Japan, vol. 11, No. 10 (M-552) (2457) 10 Jan. 1987 & JP-A-61 187 563 (Yamaha) 21 Aug. 1986.
Ito Eiichi
Okubo Akihiko
McMahon Marguerite
Yamaha Hatsudoki Kabushiki Kaisha
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