| 摘要 |
PROBLEM TO BE SOLVED: To mechanically lock a rotor 22 in the most retarded position and the most advanced position with a simple structure. SOLUTION: A hydraulic variable valve timing device comprises a housing 21 and the rotor 22 which relatively rotate by fixed angle, and are rotated by hydraulic pressure supply to an advanced angle side hydraulic pressure chamber 37 and a retarded angle side hydraulic pressure chamber 38 on both sides of a vane 34. In a second lock mechanism 42 locking in the most retarded position during start, a lock key 43 is always energized in an engagement direction by a second coil spring 46, and is separated off of an engagement groove 44 by hydraulic pressure to the advanced angle side. In a first lock mechanism 41 locking the rotor 22 in the most advanced angle position, a lock pin 52 is energized to an outer circumference side by centrifugal force during operation and engages with an engagement hole 53. The lock pin is separated off by spring force of a first coil spring 55 during engine stop. COPYRIGHT: (C)2009,JPO&INPIT
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