Defense and industrial development of rolling bearings to put forward a lot of new requirements, prompted bearing maintains a in structure and materials in continuous improvement and development. At present, maintains a rolling bearings in the role is beyond the keep, isolation, guide roller normal turn role, and in the development and utilization of lubrication oil supply to maintains a new role. Such as high speed bearings, special media work, self-lubrication bearing bearing, as well as a long service life of lubrication bearings, etc.
As bearing speed increase, dense metal materials maintains a already cannot satisfy the requirement of bearing, and density of the metal is only 1/4 to 1/8, wear-resisting, seismic resistance, resistance to radiation, magnetic, corrosion resistant, low friction unique advantages of plastic, into the rolling bearing maintains a list of materials. Phenolic laminated fabric material density is small, high mechanical strength, mechanical processing performance is good, have certain heat temperature and oil absorption, oil leakage, such as performance, it is widely applied to 2 ~ 200 mm diameter of Angle contact ball bearing maintains a. Such as high speed grinding head bearing, machine tool bearing, instrument bearing, the gyroscope bearing, turbines bearing, the supercharger bearing use phenolic laminated fabric material maintains a, including dn value can be as high as 12 x 106 mm r/min.
To metal maintains a can meet the requirements of the host occasions, plastic maintains a show special advantages. As in are not allowed to use oil of liquid oxygen (183 ℃) work in the bearing, equipped with the stamping steel maintains a deep groove ball bearing of 6204 in the 100 kg axial load, 10000 r/min running under 16 min that burn, and with glass fiber reinforced plastic production of ptfe keep frame of Angle contact ball bearing, and in the 100 kg of the axial load, 20000 r/min running under 20 h, still no friction torque increase. Use mos2, ptfe, glass fiber modification of polyimide for bearing maintains a, can be in vacuum radiation work without oil lubrication, has been used in the Apollo spacecraft. Porous oil polyimide maintains a long life in the gyroscope bearing, porous oil phenolic laminated fabric material maintains a communications satellite institution in the bearings, polyimide maintains a high-speed drill in the bearings, glass fiber reinforced polyamide 66 maintains a car in the gear box, differential gear box, the clutch and the wheel hub, water pump and mines in the transmission device, the use effect is very good.
Some companies are large foreign use plastic maintains a, such as SKF companies already have all kinds of bearing plastic maintains a certain range in size chosen for standard maintains a; The company adopted a FAG plastic maintains a bearing which accounts for 30% of production for each car provides more than 50 sets of bearing, most used plastic keep frame. Doors and Windows bearing, high-grade furniture drawer bearing, table wheel bearings, toys bearing are already using engineering plastic production maintains a, have saved a lot of metal, save time, cost reduction, etc special advantages, and it has good self-lubricating performance.




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