| 摘要 |
PROBLEM TO BE SOLVED: To provide a variable valve timing control device, without using a return spring as self-reset driving force to an intermediate lock position, by converting a phase in both ignition timing advance and ignition timing delay directions from the intermediate lock position. SOLUTION: A phase variable control device controls phase conversion being a relative rotational position of a sprocket 1 and a vane rotor 7, and is provided with a power transmission mechanism capable of selecting an ignition timing delay directional lock releasing state of allowing relative rotation of the sprocket 1 and the vane rotor 7 only in one direction, an ignition timing advance directional lock releasing state of allowing only the reverse rotation direction, a both directional lock state of not allowing both directions of one direction and the reverse rotation direction and a both directional lock release state of allowing both directions of the one direction and the reverse rotation direction. A piston 14 is also arranged for switching the both directional lock state and the both directional lock release state. Wedge engagement in the first circumferential direction and wedge engagement of the second circumferential direction are alternately released in a process of shifting to the both directional lock release state from the both directional lock state by driving of the piston 14. COPYRIGHT: (C)2008,JPO&INPIT
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