Bearing Assembly, Greasing & Sealing Line

Selection criteria

Grease-quantity accuracy, cleanliness, shield press force.

Supply chain

Bearing assembly, greasing and sealing lines are mostly built by Chinese automation makers for domestic bearing plants or by the bearing makers themselves. Grease type and fill quantity are set here; specify them on your bearing drawing for consistent noise and life.

Buyer FAQ

How much grease should a sealed motor bearing contain?

Typical fill is about 25–35 % of the bearing's free internal volume, with less for very high speeds. Overfilling raises running temperature and causes leakage; underfilling shortens grease life. Good lines hold fill quantity within about ±10 % by weight, and the grease type should be named on your bearing drawing.

Metal shields (ZZ) or rubber seals (2RS): which should I choose?

ZZ shields are non-contact, so they have low friction and suit high speeds in clean environments. 2RS contact seals keep out dust and water much better but add friction torque and heat and lower the speed limit. Non-contact rubber seals (2RZ type) sit in between. Shield press force must be controlled, because a deformed groove or shield causes noise.

What cleanliness and final checks should the assembly line include?

Rings and balls should be washed and demagnetised before assembly, in a clean, positive-pressure area. Final 100 % checks typically cover radial clearance, rotation feel or noise, vibration grade, grease weight and shield presence. Specify the clearance you need (CN, C3 or CM) for your shaft and housing fits.

Where it is used