| 摘要 |
PURPOSE:To optimize open/close timing of suction/discharge valve by constructing transmission of cam shaft and crank shaft through a helical gear then moving the cam shaft axially in accordance to operating state. CONSTITUTION:Helical gears 5, 6 are employed in a gear mechanism for driving a cam shaft 2 through a crank shaft 1, then it is co-operated with a hydraulic motion mechanism 10 for moving the cam shaft 2 to move the cam shaft 2 axially in accordance to engine rotation to be provided from a rotation sensor 17 thus to rotate cam shaft 2 and to shift cam phase. Consequently open timing of suction valve and close timing of exhaust valve can be optimized under low and high speeds resulting in improvement of fuel consumption and high speed output. |
