Sometimes in order to shorten the length of the nacelle, the generator is arranged in reverse, and the generator rides on the large axle box. At this time, the input and output shafts of the gear box are on the same side. The gear box is designed as a " U " shape. The bracket is made into one body, with sufficient supporting rigidity, and the weight concentration of each part in the engine room is better. Wind power generation is a key component of the main drive of a wind turbine. The gearbox is located between the wind wheel and the generator to transmit power to increase the speed. It is a heavy-duty gear transmission device that works under the action of irregularly changing directions and instantaneous strong impact loads.