| 摘要 |
The present invention relates to a lock mechanism for a valve timing regulation device which regulates the timing of the opening and closing of engine valves, the lock mechanism locks or releases a first rotating body and a second rotating body in response to the operational condition of an engine. The lock mechanism includes a radial groove 32 provided in either the first rotating body 21 or the second rotating body 24 and extending in a radial direction of the rotating body. A locking member 35 is slidably inserted into the radial groove 32, and the locking member is urged towards a center of the rotating body by an urging means 36. An oil pressure is applied to the locking member 35 in a direction opposite to the urging direction. In such a way, it is possible to assemble the locking member 35 onto an end face in an axial direction other than a vane 24a or a shoe 23a in either the first rotating body or the second rotating body, as a result, each vane 24a or each shoe 23a can be formed with approximately the same circumferential length. Thus, it is possible to expand the angular range to be regulated by the valve timing regulation device and to reduce the degree of unbalance in the device by a large amount.
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