Withdrawal sleeves are slotted steel sleeves and are used for fastening bearings with a conical bore on cylindrical shafts. Accordingly, they have a cylindrical bore and a tapered outer surface. In contrast to clamping sleeves, withdrawal sleeves are only suitable for being pushed under the bearing. The thread for screwing on a grooved nut, which also takes over the function of the locking element after assembly, is therefore located on the larger cone diameter.
By drawing the bearing onto the sleeve, the bearing clearance is reduced, and a tight fit is produced. As the bearing size increases, the pressing force to be generated also increases. In order to reduce the friction force between the fitting surfaces to be pushed, withdrawal sleeves are designed from a sleeve bore of 140 mm with two hydraulic connections on the thread side – one with access to the oil grooves on the lateral surface, the other with access to the oil grooves on the bore.
Withdrawal sleeves are available in various dimensional series adapted to the bearings to be mounted with a 1:12 or 1:30 taper.
Withdrawal sleeves are standardised in DIN 5416. With the exception of customized adaptations or special designs, KRW withdrawal sleeves comply with the specifications in DIN 5416.
In contrast to a clamping sleeve, a withdrawal sleeve is not supplied with a grooved nut and a locking element as standard. The suitable grooved nut according to DIN 981 as well as the locking element to prevent twisting according to DIN 5406 must be selected on the basis of the thread of the withdrawal sleeve itself and ordered separately.
The nomenclature of a withdrawal sleeve according to DIN 5416 is as follows:
Withdrawal Sleeves DIN 5416 — AH 220: Designation of a withdrawal sleeve with d1 = 95 mm bore diameter and B1 = 45 mm sleeve width for a bearing with d = 100 mm, without oil connection
Withdrawal Sleeves DIN 5416 — AH 3144 H: Designation of a withdrawal sleeve with d1 = 200 mm bore diameter and B1 = 145 mm sleeve width for a bearing with d = 220 mm, with two oil connections on the thread side (suffix H)