DINTECHNICAL INFORMATION

Limiting speeds

The limiting speed of a bearing is considered to be the maximum continuous speed, at which there will be no risk of gripping due to temperature rise or excessive heat dissipation of the bearing. This speed is limited by the mechanical or thermal constraints and mainly depends on the following factors:

● ball bearing size

● quantity and viscosity of the lubricant

● cooling

● type of cage

● operating clearance
 

The bearing tables indicate the limiting speed for each type of bearing according to the type of lubricant, for open bearings or bearings with non-contact shields, as well as for arrangements with rubbing seals.

The speeds indicated for greased bearings are valid for lubrication with Klueber Isoflex Super LDS 18 for metric bearings and Exxon Beacon 325 for inch bearings. The grease fills 35% ± 5% of the free space in the bearing.

The speeds indicated for oiled bearings are valid for lubrication by oil circulation.

The following conditions are prerequisite:

● normal load

● brass or steel (Y/J) Cage

● normal clearance and machining quality P0 or P6

● rotating inner ring

● all bearing size

For applications with parameters differing from those above-mentioned, correction factors have to be taken into account in order to define the admissible limiting speed.

* Note:  It is important to mention that the limiting speeds and correction factors are approximations. It is advisable to contact WIB when important criteria such as the lubricant are not mentioned in the table.

ISO

Parameters / Components

Correction
Factor

Cages

Cages for Standard Bearings

Tolerance
Class

P0, P6

1 

P5

1.2 

Kinematic

rotating inner ring

1

rotating outer ring

0.6

Paired Assembly

0.8

Back to
Technical Information Menu