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 /  / How to choose a bearing?

FAQ How to choose a bearing?

To properly choose a ball bearing, the important thing is to take into account several parameters:

 

 


1. Its application

Bearings are everywhere and therefore their applications are varied:

  • - Agriculture (agricultural machinery, tools, ...)
  • - Domestic (turntable, fishing rod, rollers, ...)
  • - Industry (assembly lines, industrial machinery, ...)
  • - Machines (tools, robots, ...)
  • - Vehicles (cars, motorcycles, bicycles, trailers, ...)
  • - Office (fans, ….)

 

The application for which the bearing will be used will therefore be decisive in the choice of the part.

 

 

 

2. The speed of rotation

The ball bearing supports high speeds and reduced loads, while the tapered roller bearing supports higher loads but lower speeds.


The speed limits of a bearing are determined by the operating temperature.


The speed limit can be defined as the highest rotational speed a ride can achieve depending on use, without compromising performance and duration.


The speed limit of bearings depends on several factors, such as: bearing type, load size, tolerance class, cage configuration, work set, lubricant, lubrication and cooling conditions, etc.

 

 

 

 

3. The supported load

2 types of loads are supported by bearings:


- Basic Dynamic Load


This is the maximum permissible load of the bearing capable of providing a nominal service life equal to 1 million revolutions.
It is necessary to calculate the service time necessary to show signs of fatigue on the materials, and on this basis to determine the theoretical duration.


- Static charge


This is the load that applies to the stationary bearing. It corresponds to a contact stress calculated between the rolling body in the most loaded contact and the raceway.
The loads are of simple type and radial, for the radial bearings, of simple type and axial, for
the abutments.

 

 

 

4. Life of bearings

Bearing life is defined as the number of revolutions or hours of operation, which the bearing is able to withstand before signs of fatigue appear on one of the rings, on the raceway or on the rolling elements.

 

 

 

 

5. Nominal fatigue life

The rated fatigue life of an identical bearing or batch of bearings operating under the same service conditions shall be equivalent to at least a 90 degree of reliability.


The average life of a bearing lot is much greater than its nominal duration.


The nominal fatigue life is expressed as L10 (Million revolutions) or L10h (service hour).

 

 

 

6. Bearing tolerance

Bearing tolerances have been standardized both nationally and internationally in accordance with ISO standards.

Bearings are generally manufactured in the P0 tolerance class.

Other parameters can be studied to choose the bearing best adapted to your needs:

  • - The conditions of use and the constraints
  • - The requirements of duration of the machine
  • - The mimics of congestion of the bearing
  • - Negative factors (vibration, shock, heat, dirt, acceptable sound level, etc.)


The choice of bearing is therefore mainly dictated by the dimension and load characteristics to which the bearing is subjected.

 

 

 

And do not hesitate to contact our team who will be happy to inform you by phone

8:30am-7pm UTC+01:00 - Monday to Friday : 02038 087 274

 

 

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