Forced lubrication type yaw gearbox for input bearing

The invention relates to the technical field of fans, in particular to an input bearing forced lubrication type yaw gearbox which comprises a box body provided with a shaft hole, a power input shaft, an oil seal and an input bearing, the power input shaft, the oil seal and the input bearing are installed in the shaft hole, and a lubrication cavity is formed in the part, located between the oil seal and the input bearing, in the shaft hole; an oil storage cavity used for storing lubricating oil is formed in the box body and located below the input bearing. The power input shaft is fixedly connected with a fan blade capable of rotating synchronously with the power input shaft, the fan blade divides the lubricating cavity into an upper lubricating cavity and a lower lubricating cavity, the upper lubricating cavity is communicated with the oil storage cavity through a first liquid flow channel, and the lower lubricating cavity is communicated with the oil storage cavity through a second liquid flow channel. It ca