A transmission mechanism between at least one accessory and engine members for driving the rotor of a rotorcraft, the transmission therebetween being selectively either in isolation or in combination. An intermediate shaft is interposed between a main drive shaft for the rotor and a secondary drive shaft for the accessory, for driving the accessory from an engine member allocated to driving it. This intermediate shaft engages directly on the main shaft and meshes with an accessory drive gear via freewheels to enable the gear to be driven either by the engine member or from the main shaft in the position for combined drive together with the rotor, the rotor being driven by the other engine member or autorotation in the event of both engine members failing.
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