Limiting speed of bearing

Limiting speed of bearing

The speed of the bearing is mainly limited by the temperature rise caused by the frictional heat inside the bearing. When the speed exceeds a certain limit, the bearing will not be able to continue to rotate due to burns, etc. The limit speed of the bearing refers to the limit value at which it can rotate continuously without generating frictional heat that causes burns. Therefore, the limit speed of the bearing depends on various factors such as the type, size and accuracy of the bearing, as well as the lubrication method, the quality and quantity of the lubricant, the material and type of the cage, and the load conditions.

The limit speed given by the bearing manufacturer generally refers to the maximum speed that can be achieved under agreed conditions: such as bearing tolerance is 0 grade; bearing clearance is 0 group; bearing load is 10% of the rated load; lubrication and cooling conditions are normal; radial bearings only bear radial loads, thrust bearings only bear axial loads; outer ring temperature does not exceed 100℃, etc.
Factors affecting the limit speed of the bearing include the size of the external load; the direction of force; the type of lubricant, the amount of lubricant; the bearing manufacturing accuracy, that is, the tolerance grade of the bearing and the size of the bearing clearance, etc.