Mounting and Dismounting of Rolling Bearings 

The various bearing types and sizes require different mounting methods. Depending on the individual conditions these can be mechanical, hydraulic or thermal.

 

Mechanical Methods

Bearings with a maximum bore of approximately 80 mm can be mounted cold. The use of a mechanical or hydraulic press is recommended.

 

Thermal Methods

If tight fits are specified for the inner rings on cylindrical shaft seats, the bearings are heated for mounting. Sufficient expansion is obtained when heated between 80 and 100°C. Accurate temperature control is essential in heating the bearings. If the temperature exceeds 120°C there is the risk of alteration of bearing grain structure resulting in a drop of hardness and dimensional instability.

Examples:

Heating Plate

Oil Bath

 Hot Air Cabinet

Induction Heating Device

Induction Coil

 

Hydraulic Method

With the hydraulic method, oil is injected between the mating surfaces. This may be machine oil, or oil containing rust dissolving additives. The oil film greatly reduces the friction between the mating parts which can then be easily displaced in relation to one another without the risk of surface damage. Fretting corrosion can be dissolved by means of kerosene or rust-dissolving additives to the oil.

 

Rolling Bearing Dismounting

If the bearings are intended for re-use, dismounting must be performed most carefully; it is imperative that the extracting tool be applied to the ring to be extracted to prevent the rolling elements from brinelling the raceways. In addition, thin-walled outer rings involve the risk of ring fracture.

 

Mechanical Methods

Small bearings are usually dismounted with the aid of mechanical extracting devices or hydraulic presses. These are applied either directly to the tight-fitted ring or to the mating parts, -such as the labyrinth ring.

 

Thermal Methods:

Heating Ring

Induction Coil

Ring Burner

 

Hydraulic Method

With the hydraulic method, oil is injected between the mating surfaces. The oil film greatly reduces the friction between the mating parts which can then be conveniently displaced in relation to one another without the risk of damaging the mating surfaces

Reference

 CATALOGO NO. Publ. No. WL 80 100/3 EA,Mounting and DismountingFAG Rolling Bearings,,» Germany, 2004.