Powder metallurgical bearings are made of metal powder and other antifriction materials, powder suppression, sintering, shaping, and oil immersion. They have porous structures. After infiltrating in hot oil, the porosity is full of lubricating oil. When working, they are due to the rotation of the shaft neck. Suction and friction and heat, The metal and oil are heated and expanded, the oil is squeezed out of the pores, and the friction surface is lubricated. After the bearing is cooled, the oil is sucked back into the pores.
Powder metallurgical bearings are in an inactive state. The lubricant is filled with its pores. During operation, the shaft rotation is heated due to friction. The thermal expansion of the bearing tile reduces the pores. Therefore, the lubricant overflows and enters the bearing gap. When the shaft stops rotating, the tile cools, the pores recover, and the lubricant is sucked back into the pores.
Although powder metallurgical bearings may form a complete oil film, in most cases, such bearings are in an incomplete oil film mixed friction state. Oil-bearing bearing tile materials that can be filled with pores using porous properties of materials include: wood, growing cast iron, cast copper alloys, and powder metallurgical wear reduction materials; The affinities between the material and the lubricant can be used to make the lubricating oil evenly dispersed in the material.
The above is an explanation of the application of powder metallurgical bearings. Powder metallurgical bearings can generally be formed at one time without cutting. Costs are lighter than machining, materials are less wasted, and prices are therefore cheaper. It is also in line with the current national policy of promoting energy conservation and is therefore considered a technology that will not be obsolete.