Multiple-position, operator-carried, four-stroke engine

US6568364B2 · kind B2 · utility

Assignee

• MTD Southwest, Inc. · US

Inventors

• Shiro Kawamoto · Gilbert, US
• Harry Gene Richard · Phoenix, US
• John D. Sheldon · Chandler, US
• Yoichi Imgawa · Chandler, US

Key dates

• Filing date: Feb 5, 2002
• Grant date: May 27, 2003
• Expiry date: Feb 5, 2022

Classification

• Technology area (CPC —): General

Abstract

An oil mist generator is connected drivably to the crankshaft for agitating liquid oil in the crankcase to establish a lubricating oil mist. The crankcase, the cam region and the valve chamber form a closed oil mist containment whereby lubricating oil mist is distributed throughout the engine during operation regardless of angular orientation of the engine. The crankshaft ventilation passage establishes lean crankcase gas distribution to the engine air/fuel intake. The crankcase is designed to avoid flow of liquid oil through the crankshaft passage when the engine is not running.