Contents
How is bearing life rating calculated?
Bearing Rating Life Calculation
- C = Dynamic Capacity (dN or Lbs)
- P = Equivalent Bearing Load (N or Lbs)
- N = Rotating speed in RPM.
- e = 3.0 for ball bearings, 10/3 for roller bearings.
What is a bearing load rating?
The basic dynamic load rating (Cr) of a bearing with rotating inner ring and stationary outer ring is that load of constant direction and magnitude which a sufficiently large sample group of apparently identical bearings can endure for a basic rating life of one million revolutions.
How bearing is measured?
How Bearings Are Sized. Bearings are measured by their inner diameter, outer diameter, and width; the size of a bearing is normally listed as such: ID x OD x W. These measurements are normally taken in millimeters, but can be converted to inches.
What is normal bearing clearance?
As a general rule, a ball bearing should have an almost-zero operational clearance, while needle, spherical, cylindrical and CARB toroidal bearings should always have some residual radial operational clearance. Radial clearance is the play between the ball and raceway perpendicular to the bearing axis.
What is the rated life of bearing?
Average life –median lives of groups of bearings are averaged–somewhere between 4 and 5 times the L10 life. The constant radial load which a group of bearings can endure for a rating life of 1 million revolutions of the inner ring (stationary load and stationary outer ring).
What does 2z mean on a bearing?
2 Z / ZZ – Bearing with a metal seal on both sides. Z – Bearing with a metal seal on one side, one side open. E – Reinforced Design.
What is a line of bearing?
A bearing describes a line as heading north or south, and deflected some number of degrees toward the east or west. A bearing, therefore, will always have an angle less than 90°.
What does 2RS mean on a bearing?
2 rubber seals
The 2RS stands for 2 rubber seals. One on each side of the bearing. So the RS denotes only one side is sealed with a rubber seal and the other is exposed and not sealed.
What does C2 mean on a bearing?
less than standard clearance
C2 – Refers to a “less than standard clearance”. Bearings with this type of clearance are uncommon and have very limited uses. C3 – Refers to a “greater than standard clearance”. This is the most common type of bearing, and is the correct choice for the majority of applications.
What is L10 life of bearing?
In the simplest terms, L10 life is calculating, with 90% reliability, how many hours a bearing will last under a given load and speed. To achieve these calculated lives, it requires the end user to maintain oil quality and contamination to a specified level.