Lubrication system for low-speed bearing of speed reducer

The utility model relates to a lubricating system of the low-speed bearing of a reducer, which comprises an output shaft, a lubricating device of the bearing of a middle shaft and an oil return device, wherein, the lubricating device includes a plurality of handleless oil cups fixed on the gear of the output shaft, which are arranged along the circumferential direction of the gear, and the opening of each handleless oil cup corresponds to the rotational direction of the gear; the spacial position of an oil plate corresponding to the handleless oil cups is higher than the bearings of the output shaft and the middle shaft, and mutually communicated lubricant channels are arranged between the oil plate and the bearings of the output shaft and the middle shaft; the directions of the openings of two adjacent handleless oil cups are opposite. The utility model has the advantages of simple structure and convenient installation, and moreover, no matter how fast the speed is, which direction the rotation is in and how sticky the lubricant is, the utility model can ensure that sufficient oil can be used to lubricate the bearings.