Bearing internal clearance is critical to maintain the bearing’s efficiency during operations. It determines whether rolling elements move in a rolling or sliding motion, significantly affecting the bearing’s mechanical efficiency.
There are two types of bearing clearance.
- Radial Internal Clearance - Movement perpendicular to the bearing axis
- Axial Internal Clearance - Movement along the bearing axis.
Radial Internal Clearance can be calculated by taking the average raceway diameter of the outer ring, subtracting the average raceway diameter of the inner ring, and then doubling and subtracting the ball diameter. Axial play, measured along the bearing axis, is typically about ten times the radial play value.
Proper internal clearance is critical for maintaining a stable load distribution within the bearing, directly impacting the bearing performance by reducing running noise and controlling vibration levels.
How much can bearing internal clearance be?
Ideally, bearing internal clearance should be as low as possible, a few microns and even zero after assembly. The correct clearance degree is determined by several project-specific factors, including application, temperature and load conditions.
Choosing the correct internal clearance ensures optimal bearing performance, reducing the risk of premature failure and enhancing overall efficiency.
What influences the internal bearing clearance?
Internal bearing clearance refers to the freedom of movement of the bearing rings, influenced by several factors.
- The fitting of the inner ring - Slight interference fit causes the inner ring to expand during operation, while the outer ring contracts.
- The fitting of the outer ring - Static loads on the outer ring can press against the inner ring, affecting clearance.
- The temperature difference between the inner and outer ring - Temperature changes affect the expansion of rings, with rolling elements typically assuming the inner ring’s temperature.
Why is the correct bearing C code important?
The bearing’s C code indicates its internal clearance in the machine, which is crucial to preventing excessive clearance. Internal bearing clearance largely determines operational performance, affecting durability, vibration levels, noise generation and heat dissipation. Calculating effective internal bearing clearance ensures selecting the correct C code for bearings.
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