Patent ID: 8479692

Claim:
A valve cooling device of an internal combustion engine in which engine oil is circulated in a valve that faces a combustion chamber, wherein the valve includes: a valve umbrella portion that intakes air from a combustion chamber side or opens and closes an exhaust passage end; and a valve stem that extends from the valve umbrella portion to a valve operating chamber side, an inside of the valve stem is formed with an oil introduction channel which extends so as to be parallel to the valve stem and in which one end is opened in an extended direction of the valve stem and other end reaches an inner portion of the valve umbrella portion; and an oil lead-out channel which similarly extends so as to be parallel to the valve stem and in which one end communicates with the other end of the oil introduction channel in the valve umbrella portion and other end is opened to an inner portion of the valve operating chamber, a jet portion that includes a jet oil passage coaxially disposed with the oil introduction channel is provided in the extended direction of the valve stem, and the engine oil is injected from an orifice provided on a tip portion of the jet oil passage to an inner portion of the oil introduction channel, the tip portion of the jet oil passage being apart from the oil introduction channel.