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Adapter and Withdrawal Sleeves

Sleeves permit bearings with a tapered bore to be tightly fitted on cylindrical shafts of broad diameter tolerances. In general, the bore taper of such bearings is 1:12. However, Spherical roller bearings of the 240.. and 241.. series have a bore taper of 1:30.

Two principal of sleeve exist:
- Adapter sleeves, which generate a tight fit by driving the bearing along the sleeve.
- Withdrawal sleeves, which generate a tight fit by driving the sleeve into the bore of the bearing.

The latter permit easy dismounting of the bearing by simple application of the appropriate withdrawal nut.

The quality of bearing installation and fit is fundamental to the achievement of the long and reliable service. The cleanliness and suitability of the lubrication are also important factors.

Diameter tolerance: Quality 9 minimum
Form tolerance: Quality 5 minimum

Hydraulic sleeves: Wtih large diameter bearings it is possible to use hydraulic sleeve that is provided with ducts and distribution grooves thereby permitting the injection of pressurised oil between the bearing and the sleeve, and between the sleeve and shaft.

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