A bearing’s performance is largely influenced by its components, and one of the most critical elements is the bearing cage. Also known as a retainer or separator, the bearing cage holds the rolling elements in place, ensuring symmetrical spacing and smooth, consistent, and reliable movement. Bearing cages are guided by one of the available surfaces between the inner and outer rings. 

 

The primary purpose of the cage

The primary role of a bearing cage is to maintain equal spacing between the rolling elements (balls, rollers, or needles) and ensure their proper alignment within the bearing. This design helps achieve smoother movement by preventing rolling elements from coming into direct contact with one another, which reduces friction, heat, and wear.

 

Additionally, bearing cages provide stability to the rolling elements, allowing them to rotate in unison with reduced noise and vibration. Other essential functions of bearing cages include: 

 

  • Guiding the Rolling Elements: Ensures they stay on the correct path, reducing slippage and uneven wear. 
  • Lubricant Distribution: Some cages are designed to enhance the distribution of lubricants within the bearing, ensuring consistent performance over time. 
  • Improved Bearing Life: By minimizing friction and maintaining alignment, cages extend the overall lifespan of the bearing. 

 

Classification of bearing cages

Cages can be classified according to the manufacturing process and material:

 

  • Pressed cages that use coldrolled steel  
  • Machined cages that use high tensile strength brass casting or carbon steels  
  • Polyamide cages that use polyamide resins 
  • Phenolic cages 
  • Ceramic or composite cages 

 

Bearing cages types

 

Material selection

Bearing cage material is selected according to the operating conditions. For example, polyamide cages should only be used in the temperature range of -40° to + °120C. Brass cages should not be used in environments with ammonia or at temperatures over 300°C. Both the design and material of the cage have a significant influence on the suitability of a rolling bearing for a particular application. 

 

If you’re looking for guidance in selecting the right bearing cage or have any specific requirements, our team at Codex is here to help. Contact us today to discuss your needs and explore our range of high-quality bearings and components designed to deliver reliable performance across diverse industries. 

 

 

 

Contact us today to discuss your specific requirements.

 

 

Contact us

  • This field is for validation purposes and should be left unchanged.