Source: China Bearing Network | Date: February 3, 2014
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24. Roller Grade
The specific combination of roller diameter and shape that defines the grade of a roller.
25. Roundness Deviation
The minimum radial distance between two concentric circles that enclose the measured surface; this represents the roundness error.
26. Cylindricity Error
The minimum radial distance between two coaxial cylinders that contain the measured surface; this is known as the cylindricity error.
27. Spherical Deviation
The deviation from a perfect spherical shape, calculated as the maximum radial distance between the inscribed or circumscribed sphere and the actual surface in the equatorial plane.
28. Radial Runout of Inner Ring (for Radial Bearings)
When the inner ring is rotated at different angles, it refers to the difference between the maximum and minimum radial distances between the outer surface of the bore and a fixed point relative to the outer ring. The angular position of the contact point should be such that the raceway of the outer ring or the inner rib of tapered roller bearings touches the rolling element, ensuring normal relative positioning of bearing components.
29. Radial Runout of Outer Ring (for Radial Bearings)
When the outer ring is rotated at different angles, it refers to the difference between the maximum and minimum radial distances from the outer diameter to fixed points on the outer ring. The contact point should ensure that the outer raceway or the inner rib of tapered roller bearings touches the rolling elements, maintaining proper relative alignment.
30. Radial Clearance (Non-Preloaded Bearings)
This is the average radial distance between one raceway and the opposite side when there is no external load. It includes the displacement of one raceway relative to the other at various angular positions and the movement of the rolling elements under different orientations.
31. Theoretical Radial Clearance (for Radial Contact Bearings)
Calculated as the difference between the outer raceway contact diameter and the inner raceway contact diameter, minus twice the roller diameter.
32. Axial Clearance (Non-Preloaded Bearings)
The average axial distance between one raceway and the opposite end when there is no external load. This accounts for axial displacement of raceways at different angular positions and the movement of rolling elements relative to the raceways.
6. Torque, Load, and Life
Starting Torque: The torque required to initiate rotation of one bearing ring or washer relative to another fixed ring or washer.
Rotational Torque: The torque needed to prevent movement of one ring or washer while the other rotates.
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Bearing Related Knowledge
Understanding the factors that influence bearing life is essential for proper maintenance and selection. Common causes of bearing failure include improper installation, misalignment, contamination, and incorrect lubrication. TIMKEN bearings are widely used in industrial applications due to their high performance and durability. Heat treatment can affect the quality of bearing components, so it's important to follow strict manufacturing standards. Proper packaging is also crucial to protect bearings during transport and storage.
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