| 摘要 |
PROBLEM TO BE SOLVED: To secure excellent cooling capability of an electric actuator of a valve characteristic variable mechanism and increase displacement flexibility of the electric actuator so that the electric actuator can be compactly disposed on a cylinder head in an internal combustion engine for a vehicle. SOLUTION: A valve device of the internal engine mounted on the vehicle is equipped with the valve characteristic variable mechanism controlling a valve operation characteristic of an engine valve. An electric motor 80 of the valve characteristic variable mechanism is constituted so as to be disposed outside of a valve chamber formed by the cylinder head 12. In the cylinder head 12, an air introduction passage 85 introducing travel wind is formed between a combustion chamber and a valve chamber, and the electric motor 80 is adjacent to the valve chamber in the radial direction of the cylinder axis line L1 and disposed at the position where the travel wind which flows in from an inlet part 85a and circulates through the air introduction passage 85 impinges. COPYRIGHT: (C)2005,JPO&NCIPI
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