| 摘要 |
PROBLEM TO BE SOLVED: To provide a parking control device which is improved in responsiveness without causing the lowering of oil pressure for releasing parking. SOLUTION: In an initial stage for releasing the parking, a large force can be taken out of an output rod 33 fixed to a small-diameter piston 32 since pressure-receiving areas of a large-diameter piston 31 and the small-diameter piston 32 are large, a parking rod cam 15 is driven in this state by a distance equivalent to a moving distance of a parking rod 14 which elastically contacts with a support 17 and a parking pole 18, then the large-diameter piston 31 is stopped, only the small-diameter piston 32 is moved, and thereby the responsiveness for the introduction of oil pressure from an oil-pressure introduction port 36 is improved. In this state, the movement of the small-diameter piston 32 can be linked to the movement of the parking rod 14. Accordingly, since the oil pressure fed to a releasing cylinder 30 is reduced in amount as a whole, the lowering of the oil pressure for releasing the parking is not caused, and thus the favorable responsiveness can be obtained. COPYRIGHT: (C)2009,JPO&INPIT
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