| 摘要 |
PROBLEM TO BE SOLVED: To prevent occurrence of hammering noise from an engine valve during opening or closing of the engine valve for valve timing control, in a valve operating device of which opening and closing time of engine valve is controlled by valve operating cam oscillating about a camshaft. SOLUTION: A valve characteristic varying mechanism for the valve operating device is provided with the valve operating device cam supported by the camshaft and a drive mechanism for oscillating an interlinking mechanism about the camshaft, the interlinking mechanism oscillating the valve operating cam by a drive cam integral with the camshaft. The engine valve starts to open and close at a cushioning section of the valve operating cam, and the drive mechanism oscillates the valve operating cam through the interlinking mechanism to control an opening and closing time of the engine valve. A cam mountain section of the drive cam has a constant speed section Sc at which a lifting speed is constant, and the constant speed section Sc is set across an angular widthθw where an opening time is included at the most advanced angle positionθeomax (θiomax) at the opening time of the engine valve and where an opening time is included at the most delayed angle positionθeomin (θiomin) of the opening time. COPYRIGHT: (C)2005,JPO&NCIPI
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