Structural Features of Deep Groove Ball Bearings
May 25,2026
Basic Components
It consists of an inner ring, an outer ring, a set of steel balls, and a cage. The steel balls roll between the raceways of the inner and outer rings, while the cage separates the balls and ensures their uniform distribution.
Raceway Design
The raceways of the inner and outer rings are arc-shaped, with a groove radius slightly larger than the steel ball radius. This design enables the bearing to withstand radial loads as well as bidirectional axial loads.
Sealing method
Open bearings: lack a sealed structure and require external lubrication and dust-proofing measures.
Sealed bearing:
Dust cover (ZZ/2Z): Made by stamping steel sheet to prevent dust ingress, but grease may leak slowly.
Contact-type seals (RS/2RS): Made of rubber, they are in direct contact with the inner ring, providing excellent sealing performance but generating relatively high friction.
Non-contact sealing rings (RZ/2RZ): made of rubber, with a clearance maintained between the seal and the inner ring to balance sealing performance and friction.
Deformed structure
Bearing with a retaining groove: The outer ring is equipped with a retaining groove for easy axial positioning.
Ball-feeding-groove bearings: Both the inner and outer rings are equipped with ball-feeding grooves, allowing for the insertion of more steel balls and thereby increasing radial load-carrying capacity; however, axial load-carrying capacity is reduced.
Double-row deep-groove ball bearings consist of two rows of steel balls and can withstand higher radial loads as well as bidirectional axial loads.
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