At present, the common mowers abroad are mainly gasoline engine and electric mower. With the market demand, many foreign brand companies have launched intelligent automatic mower, which is especially suitable for the trimming of large grass, especially for the elderly and people who are inconvenient to move. Due to the technical problems, the first generation of automatic mower needs to connect the line on the lawn, which is inconvenient. Now, some companies have launched more advanced intelligent lawn mowers, which can automatically and orderly cut back and forth according to users' requirements Grass, completely replace manual mowing. The air compressor is driven by single-phase series excitation motor. The required speed is obtained by reducing the speed of big and small belt wheels. The connecting rod is driven to make the piston move in the cylinder. The air is compressed into the air inlet. The muffler is more convenient to select and use air. Application scope: decoration, medical treatment, food, automobile exhaust, aerodynamic tools, etc. Innovation: the research on the connecting rod bearing of automobile water pump in our country is relatively late, and there is a big gap with the advanced level of foreign countries. Because the service environment and product structure of pump bearings are different from those of ordinary bearings, the selection of bearing lubricating oil, the formation of oil film and the sealing state will affect the service life of bearings. Therefore, the lubrication and sealing technology of the connecting rod bearing of automobile engine water pump is an urgent technical problem for domestic water pump bearing manufacturers.