China deep groove ball bearing
Deep groove ball bearings are capable of operating at high speeds and are widely used radial bearings. These non-separable bearings are available in a wide variety of seal, shield and snap-ring arrangements. It requires little attention or maintenance in service.
Physical Characteristics
- Deep groove ball bearings have deep uninterrupted raceways. This allows them to carry axial loads in both directions at reasonably high speeds.
- The bearing ring grooves are circular arcs made slightly larger than the radius of the ball.
- The balls make point contact with the raceways (elliptical contact when loaded).
- The inner ring shoulders are of equal height (as the outer ring shoulders).
Advantages Of Deep Groove Ball Bearings
- Can sustain radial, axial, or composite loads.
- Can provide both high-running accuracy and high-speed operation.
- Can take the place of high speed angular contact ball bearings.
- Simple design.
- Maintenance free.
- Longer service life.
Application Of Deep Groove Ball Bearings
Deep groove ball bearings are widely used, when
- axial loads from two directions have to be transmitted, and existing space does not allow installation of matched spindle bearings.
- best possible guidance of rotating parts is required and speed is less important.
Buying Tips Selecting Deep Groove Ball Bearings
Before selecting a deep groove ball bearing you should take note of the followings:
- Material - Chrome steel, High temperature steel, ball material
- Maintenance requirements bearing applications
- Service life
- Bearing clearance
- Sealing efficiency
- Contamination exclusion and grease retention
- Low-friction seals for energy saving
Types Of Deep Groove Ball Bearings
Deep Groove ball bearings with an outside diameter less than 9 mm are known as Miniature ball bearings. Deep Groove ball bearings with an outside diameter ~ 9 mm and a bore diameter < 10 mm are known as Extra-small ball bearings. Deep groove ball bearings with seals or shields are standardized. They contain proper amount of grease in advance.
- Small shielded - The smaller shielded bearings have a sheet steel shield forming a long sealing gap. These bearings are preferred for application where the inner ring rotates. The rotation of outer ring may cause spilling of grease.
- Large shielded - The larger shielded bearings do not have a cylindrical section in the shield bore. These bearings are preferred for application where the inner ring rotates. The rotation of outer ring may cause spilling of grease.
- Low friction seal - In the ball bearings with a low friction seal, the lip of the seal forms a narrow gap with the land of the inner ring making it non-rubbing type. These seals allow same quality as in shields with a better sealing. They are made of oil and synthetic rubber with a sheet steel reinforcement. Operating temperature is -40° C to 120° C.
- Sealed ball bearings - In the sealed ball bearings the sealing lips seal against the recesses of the inner ring and the outer diameter of the seal form the outer diameter of the outer ring. They are made of oil and synthetic rubber with a sheet steel reinforcement. Operating temperature is -40° C to 120° C. At higher speeds the grease may leak out.
Deep Groove Ball Bearings Specifications & Standards
- Dimensions - The dimensions are as per the ISO recommendations.
- Alignment - They have limited ability to adjust to alignment problems. There is a permissible level of angular misalignment that will not produce additional stress. It depends on the radial internal clearance, bearing size, internal design and forces acting.
- Tolerance - They are usually meant for normal tolerance but can be enhanced.
- Internal Clearance - The normal radial internal clearance is taken as standard but there may be certain variations. Values confirm to ISO recommendations.
- Cages - There are standard cages but some may have pressed steel cage, glass fiber reinforced, or machined brass cages.
- Minimum Load
Equivalent Dynamic Bearing Load for Bearings with filling slots
P = Fr + Fa
Provided Fa / Fr <= 0, 6 and P < 0, 5 Co.Equivalent Static Bearing Load for Bearings with filling slots
P0 = Fr + 0, 5 Fa
Provided Fa / Fr < 0, 6
