Four-cycle marine engine

US5899177A · kind A · utility

Assignee

• Outboard Marine Corporation · US

Inventors

• Gregory J. Binversie · Grayslake, US
• George Broughton · Zion, US
• Paul W. Breckenfeld · Kenosha, US
• William D. Dunham · Waukegan, US
• Stephen J. Towner · Libertyville, US
• James A. Nettles · Round Lake, US

Key dates

• Filing date: Oct 8, 1997
• Grant date: May 4, 1999
• Expiry date: Oct 8, 2017

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02B2075/027
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A cylinder block for an internal combustion engine includes a mounting surface having therein a crankcase cavity and a pair of cylinders respectively extending from the cavity in acute angular relation to each other and each including a cylinder wall. The cylinder walls include outer ends having cylinder head mounting surfaces, mixture transfer ports, mixture supply ports, gas discharge ports and a main exhaust gas discharge passage. A passage communicates between the exhaust gas discharge ports and with the main exhaust gas discharge passage. Mixture supply passages extend between the mounting surface and the cylinder head mounting surfaces and include reed valves. Branch passages communicate between the transfer ports in the cylinder walls and the mixture supply passages at respective locations between the cylinder head mounting surfaces and the reed valves. Auxiliary supply passages extend from the mounting surface and communicate with the mixture supply ports in the cylinder walls.