PROBLEM TO BE SOLVED: To provide a drive system capable of suppressing an influence of co-rotating torque, in a drive system controlling to switch a wet multiple disc clutch disposed in a multi-stage manner.;SOLUTION: A drive system using a hydraulic circuit includes three-way switch valves 16, 26, and 36 which has a high-pressure extra pressure (extra pressure 1) path, a low-pressure extra pressure (extra pressure 2) path, and clutch fitting pressure path, and switch the pressure of hydraulic oil to be supplied to a first to third clutches 12, 22, and 32 by selecting any one of paths; and a control means 52 which supplies a working fluid of fitting pressure to any one of the plurality of clutches, supplies a working fluid of the extra pressure 1 to a clutch having a transmission mechanism on a one-step lower side than the clutch to which the working fluid of the fitting pressure is supplied, and outputs a switch signal for switching a path supplying a working fluid of the extra pressure 2 to other clutches.;SELECTED DRAWING: Figure 1;COPYRIGHT: (C)2019,JPO&INPIT
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