Patent ID: 9670807
Date: 2017-06-06
CPC Classifications: F01M

Claim:
1. A breather structure for an internal combustion engine comprising: a breather hole provided in an engine body for mitigating the pressure in the engine body; wherein the engine body is provided with a ball valve including: a valve hole provided in the engine body to communicate with an inner end portion of the breather hole, said valve hole being open to within the engine body; a valve seat formed on an inner surface of the engine body to coaxially surround the valve hole; a guide sleeve coaxially communicating with the valve hole and the valve seat and secured to the engine body at one end portion; and a metallic valve element formed to be ball-like with a predetermined weight and received to be rollable in the guide sleeve for enabling the closing of the valve hole when seated on the valve seat and to be prevented from falling off the other end of the guide sleeve; wherein the ball valve is provided in the engine body so that the valve hole is positioned in a moving range of oil in the engine body depending on an inclination of the engine body; and