Oil free bearing is divided into solid inlaid bearing, composite bearing, oil bearing and new single lubricating material from product structure:

1. Solid inlaid bearing

It is common to embed solid lubricating materials such as graphite (black lead), polytetrafluoroethylene (PTFE), molybdenum disulfide into alloy materials such as high-strength brass, tin bronze, aluminum bronze, cast iron or GCr15 by inlaying process. It breaks through the limitation that the general sliding bearing relies on oil film lubrication. In the process of using, the solid lubrication and the shaft are rubbed by the friction heat, forming the excellent condition of oil and powder coexisting lubrication, which not only protects the shaft from wear, but also makes the solid lubrication characteristic eternal. The hardness, wear resistance and bearing capacity of high-strength brass are twice as high as that of common copper sleeve.

2. Composite bearing

The common composite bearing is composed of two layers of steel plate and copper powder layer (bimetal), or three layers of steel plate, copper powder layer and self-lubricating material (PTFE, peek, POM) + filling material. The self-lubricating material is bonded to the steel plate by high temperature sintering process, which not only ensures the friction and wear performance of the product working surface, but also ensures the structural stability and bearing capacity of the bearing.

3. Oil bearing

Oil bearing is made of metal material. When it is made, oil is added to the bearing and the lubricating oil is sealed in the bearing. When it is used, the effect of "self lubrication" is realized without adding oil. As the bearing contains oil lubricating oil, it has good lubricity and avoids the work of oil filling maintenance.