Gear assembly, actuator, stabilizing device and vehicle

The invention discloses a gear assembly, an actuator, a stabilizing device and a vehicle. The gear assembly comprises a first gear, a second gear and a torsion spring. The first gear comprises a first gear body and a first protrusion, the first protrusion is arranged on the first end face of the first gear body, the first protrusion is provided with a first root part, and the first root part is connected with a first abutting piece; the second gear comprises a second gear body and a second bulge; the torsion spring is in a sector ring shape, the two ends, in the circumferential direction of the rotating shaft, of the torsion spring are the first end and the second end respectively, an opening is formed between the first end and the second end, and the first protrusion and the second protrusion are located in the opening and suitable for being matched with the first end and the second end respectively. A first arc-shaped abutting surface is arranged on the side, close to the first end, of the first abutting piece, and the first arc-shaped abutting surface is in line contact with the first end, so that noise can be reduced.