Patent ID: 6394061
Filing Date: 2002-05-28
Classification: F01M,F02B,F02F

Abstract:
A system for lubricating an air-cooled 4-cycle engines comprising:an engine body having an oil storing chamber for storing a lubricating oil therein, said engine body also having a crank chamber, for accommodating a crank portion of a crankshaft therein and a valve-operating chamber, said system sequentially supplying the lubricating oil to said crank chamber and to said valve-operating chamber, wherein said valve-operating chamber and said oil storing chamber are in communication with each other through an oil circulating passage for returning the lubricating oil from said valve-operating chamber to said oil storing chamber, wherein an opening of said oil circulating passage into said oil storing chamber is disposed such that it is exposed above an oil level of the lubricating oil in said oil storing chamber when the engine is in a sideways-fallen state and when the engine is in an inverted state, and wherein, in both said sideways-fallen and said inverted states, said valve-operating chamber is oriented below the oil storing chamber.