Is one of the main parts of the bearing cage, cage of rolling bearings has four basic roles:
1. the separation of rolling elements;
2. the roller itself remains or to keep one ring together;
3. guide the rolling elements roll on the right track;
4. rolling direction, reducing friction.
By its manufacturing technology and by using of material keep frame can is divided into: to low, and carbon steel for material of stamping keep frame; to high strength copper alloy (lead brass, and nickel, and Silicon bronze,), and zinc aluminum, and nodular cast iron, for material of alloy entity keep frame; to polyamide resin for material of engineering plastics keep frame; to phenolic laminated cloth tube for material of phenolic bakelite entity keep frame. Cages with their high efficiency, light material, high strength, wide coverage, and widely used.
Cage design the basic requirements are met on a certain spatial and structural strength maximum load bearing loads and requirements of accuracy and speed of rotation, according to bearing use of working in the host and guide of clearance requirements, determine how the inner and outer diameter or rolling Guide, to determine the structure and main parameters. Rolling bearing in work Shi, due to sliding and caused bearing fever and wear, especially in high-speed running of conditions Xia, due to centrifugal force, and inertia force of role, accelerated has bearing internal scroll body, and both inside and outside ring and keep frame of collision, and friction wear and fever, serious Shi will caused keep frame burns and break, led bearing cannot normal using, keep frame damaged in bearing failure forms in the accounted for is large of proportion, and in keep frame damaged of causes in the, keep frame material bad is main causes one of. Thus, bearing retainer material should have good mechanical strength, and dimensional stability, good plasticity and Machinability, and many other properties.
Due to processing methods specific to the cage or limitations of processing difficulty, taking the load, lubrication, speed, temperature, and other factors, as well as the impact of the market on the high-speed, high-precision bearings, heavy duty, long life, low noise requirements, continuous improvement and development of the technology of bearing cage has become a necessity.



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