Four-stroke engine with rotary valve control

US6694942B1 · kind B1 · utility

Assignee

• DOLMAR GmbH · DE

Inventors

• Rainer Massmann · Bonn, DE
• Bernhard Auler · Hamburg, DE
• Wolf Burger · Eppelheim, DE

Key dates

• Filing date: May 9, 2002
• Grant date: Feb 24, 2004
• Expiry date: May 10, 2022

Classification

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

Abstract

The invention aims to provide a compact four-stroke engine with rotary valve control and petroil lubrication which has a simplified construction and allows the engine to be used in any position as a result of an improved lubrication system. To this end, the carburetor is directly connected to the inlet opening and the rotary valve is configured in such a way that in a first position it connects the carburetor to the combustion chamber, in a second position it connects the carburetor to the cylinder chamber/crankcase via the overflow conduit and in a third position it connect the cylinder chamber/crankcase to the combustion chamber via the overflow conduit and the combustion chamber to the outlet opening via the conduit. Said rotary valve is in continuous motion during the operation of the combustion engine and the first, second and third positions only occur at corresponding defined moments.