Automatic gearbox power system

The utility model provides an automatic gearbox power system which comprises an engine and a transmission, the engine comprises a flywheel and a flywheel shell which are rotatably connected, the automatic gearbox power system further comprises a torsion damper arranged between the engine and the transmission, the torsion damper comprises a disc body, and a plurality of damper springs are evenly arranged on the disc body in the circumferential direction. The disc body and the flywheel are coaxially arranged, the disc body is fixedly connected with the flywheel, the damping spring abuts against the flywheel, and the torsion damper is connected with the transmission directly or in a split mode. The torsion damper is arranged between the engine and the transmission, compared with an elastic flexible disc, installation is convenient, the torsional rigidity of the combination portion of the engine crankshaft and a transmission system is reduced, and the torsional vibration inherent frequency of the transmission sys