| 摘要 |
PROBLEM TO BE SOLVED: To improve operation performance of a switching piece for switching between a valve-rest state and a valve-operation state. SOLUTION: The valve train comprises a switching piece 317, and a coil spring 324 for imparting an urging force to the switching piece 317. The switching piece 317 has a center 317a of rotation eccentric with reference to the axial center of a valve stem 202. The switching piece 317 is rotatably mounted in the manner so that an end face 317b on the rotation center side and a tip face 317c slide along the inside periphery of a housing 302 to section the inside of the housing 302 into a pressure chamber 319 and a gas chamber 320. In the state in which the volume of the pressure chamber 319 is reduced by the urge of the coil spring 324, the switching piece 317 is positioned off the upper part of the valve stem 202 (valve-rest state). In the state in which the switching piece 317 is rotated against the urge of the coil spring 324 by the fluid pressure of the pressure chamber 319, the switching piece 317 is positioned in the upper part of the valve stem 202 (valve-operation state). COPYRIGHT: (C)2006,JPO&NCIPI
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