Bearing Cage Materail Requirement:
Bearing cage material must have good wear resistance, dimensional stability, good mechanical strength, and perfect adaptation to the operation of the bearing. Therefore, for the selection of cage materials, it is important to consider the operating environment.
Three Common Bearing Cages:
Common bearing cages are as below,
1. Stamped steel cage
2. Brass cage
3. Nylon cage
Stamped Steel Cage:
These lightweight cages have high strength, surface treatment can effectively reduce friction and wear.
The material composition is as follows,
| Steel Code | chemical composition % | ||||||
| JISG 3141 SPCC | carbon | silicon | manganese | phosphorus | sulfur | nickel | chromium |
| < 0.12 | < 0.5 | < 0.04 | < 0.045 | ||||
Brass Cage:
Small and medium-sized bearings use cut brass cages.
But brass cages are not suitable for use in ammonia-cooled compressors, because ammonia causes the brass to crack seasonally, so steel cages should be used instead.
Brass cage chemical composition is as below,
| Standard | Code | chemical composition % | ||||||||
| copper | zinc | manganese | iron | aluminum | tin | nickel | Impurity | |||
| aluminum | silicon | |||||||||
| JIS H 5120 |
CAC301 (HBsC 1) |
55.0 – 60.0 | 33.0 – 42.0 | 0.1 – 1.5 | 0.5 – 1.5 | 0.5 -1.5 | < 1.0 | < 1.0 | < 0.4 | < 1.0 |
| JIS H 3250 |
C 6782 | 56.0 – 60.5 | 0.1 – 1.5 | 0.5 -1.5 | 0.5 -1.5 | – | – | < 0.5 | – | |
Nylon Cage:
According to the types and uses of bearings, nylon cages are used more and more widely.
However, nylon retainers are not suitable for use in environments over +120°C or below -40°C.
Most cast-molded cages use nylon PA66, which may be reinforced with or without glass fiber, and is characterized by a good combination of strength and elasticity.
The life of the nylon cage decreases with the increase in temperature and the aggressiveness of the lubricant.
Therefore, whether the nylon cage is suitable for a specific purpose depends on the operating conditions and the requirements of the life.
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