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Inner
raceway curvature ratio fi = |
|
where: |
Dw
= ball diameter Ri = inner raceway radius Ro = outer raceway radius |
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Outer raceway
curvature ratio fo = |
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fi, fo values are typically 0.56 ± 0.03 for small bearings where low torque is a primary requirement. It is not necessarily the same for both inner and outer bearing raceways. Raceway curvature ratio is often referred to as a percentage f x 100%.
The total curvature of a bearing is
defined as B = fi
+ fo
- 1
Bearings are assembled with a slight amount of looseness between the balls and the raceways. This allows the bearing to rotate smoothly but also affects the performance of the bearing in a given application. This looseness can be split into two components - radial and axial play. | |
BEARING RADIAL PLAY is the maximum displacement that one bearing ring can be displaced relative to the other ring in a direction perpendicular to the axis of rotation of the bearing. Radial play = ∆r |
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BEARING AXIAL PLAY,
or end play, is the maximum relative displacement of the bearing
rings, in a direction parallel to the axis of rotation. Axial play = ∆a |
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Bearing Radial Play and Bearing Axial Play are interdependent and are determined during the manufacture of the bearing. Typically, bearing radial play is a purchasing specification. |