​For bearings with tapered bores, the inner ring is always installed with an interference fit. Unlike cylindrical bore bearings, the interference of tapered bore bearings is not determined by the selected shaft fit tolerance, but by the advancement distance of the bearing on the tapered journal, bushing or withdrawal sleeve. The radial internal clearance of the bearing decreases as the bearing advances on the tapered journal. By measuring the reduction, you can determine the degree of interference and the tightness of the fit.

When installing self-aligning ball bearings, CARB toroidal roller bearings, spherical roller timken bearings and high-precision cylindrical roller bearings with tapered bores, determine the radial internal clearance reduction value or the axial clearance on the tapered base. Advancement distance, as a measure of interference. Guidance values for clearance reduction and axial advance distance are found in the relevant product sections.

​Small bearings

Small bearings can use nuts to push them into the tapered base. Where bushings are used, sleeve nuts are used. The small withdrawal sleeve can be pushed into the bearing hole with a nut. The nut can be tightened with a hook wrench or pneumatic wrench. Before starting installation, a little oil should be added to the surface of the journal and sleeve.

Large and medium bearings

The mounting force required for large timken bearings increases significantly and hydraulic nuts and/or oil injection methods should be used.

Both of the above methods can significantly simplify the installation process. The oiling equipment required to operate the hydraulic nut and use the oiling method is available. Detailed information on these products can be found in the relevant sections of the online catalog “Maintenance and Lubrication Products”.

When using a hydraulic nut to install a bearing, it must be positioned on the threaded part of the journal or the thread of the sleeve so that the annular piston is close to the inner ring of the bearing, the nut on the shaft or the retaining ring installed on the shaft end. Oil is forced into the hydraulic nut through the oil pump, moving the piston in the axial direction with the force required for safe and precise installation. Using a hydraulic nut, install the spherical roller bearing to

Using the oil injection method, oil is injected between the Timken bearing and the journal under high pressure to form an oil film. This oil film separates the mating surfaces and significantly reduces the friction between the mating surfaces. This method is generally used when installing bearings directly onto tapered journals, but it is also used to install bearings on adapter sleeves and push-off sleeves specially prepared for the oil injection method. The oil pump or oil injector generates the necessary pressure to inject oil between the mating surfaces through the grooves and oil distribution channels on the shaft or sleeve. When designing the bearing layout, consideration must be given to arranging the necessary grooves and channels on the shaft. The spherical roller bearing is installed on the withdrawal sleeve with an oil groove. By injecting oil into the mating surface and tightening the screws in sequence, the withdrawal sleeve is pressed into the bearing hole.