In recent years, air motors have been widely used in various industries, such as the mining industry, the drilling work of the oil industry, and the drilling of rock holes. The so-called air motor is actually a device that uses the pressure generated after compressed air to convert this pressure into rotating mechanical energy. As the most important part of the air motor, the good working performance of the lubrication system will directly affect the working efficiency of the air motor. Judging from the piston air motors currently used in various industries. Its lubrication system usually adopts the mode of splashing lubrication of oil throwing disc to work, but adopting this lubrication mode will greatly restrict the working efficiency of air motor, and is also not conducive to prolonging the service life of air motor, and the main reason for causing this consequence is that the lubrication system of air motor can not accurately control the amount of lubricating oil in the working process by adopting oil throwing disc splash lubrication. A drilling equipment company has produced a 5×135 air motor, which is mainly used as a power unit for a pneumatic manned winch. For the air motor, if the lubrication system works well, it can minimize the power loss of piston friction and the friction loss at the main bearing in the working process, so that the reliability, economy and power of the air motor can be guaranteed to a large extent. The main function of the air motor lubrication system is to clean and lubricate the parts when the internal parts of the machine are in relative motion. The lubrication system delivers a dose of clean lubricating oil to the surface of the part, which reduces frictional drag and helps reduce machine wear and extend equipment life. In addition to this, the clean oil delivered by the lubrication system helps to clean and cool the equipment parts.