The stable and reliable operation of the gear box, transmission power is high. Gear box external enclosure structure can be manufactured using sound-absorbing materials, reducing noise generated in the process of the gear box. Gearbox own box structure of tie fan can reduce the operating temperature of the gear box. In using the gear box in the process of cleaning of the main gear box problems. Gearbox original to be cleaned using gearbox oil drain system and filter cleaning lubricating oil for gear boxes, without any hardware change gear box, do not add any detergent to ensure safe operation of the gear box, extend the life of the gearbox.