| 摘要 |
PURPOSE:To improve the extent of durability in a lock mechanism, by restoring driving wheels from 2WD to 4WD when all wheels are locked by the lock mechanism at the time of parking shift operation, in case of a device which makes each rotation of these driving wheels checkable by doing the parking shift operation. CONSTITUTION:A transmission 30 transmits power, corresponding to a driving state, to a rear-wheel output shaft 31 via a transfer in addition to shift motion, and also transmits it to a front-wheel output shaft 33 via a 4WD-2WD selector mechanism 32. In this case, the selector mechanism 32 is controlled by a controller 34 according to each output of respective car speed sensors 38-40, each of parking lock sensors 36 and 35 for front and rear wheels, and a 4WD detector 37 additionally installed in an output shaft of the transmission, the rear-wheel output shaft 31 and the front-wheel output shaft 33 each. And, the controller 34 forcibly selects it to two-wheel drive when parking shift operation takes place at time of four-wheel drive, and it is installed so as to be capable of performing such control as maintaining the two-wheel drive for duration till front and rear wheels are locked for parking and their rotations are stopped.
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