TIMKEN bearing installation

For tapered bore bearings, the inner ring is always fitted with an interference fit. Unlike cylindrical bore bearings, the interference of tapered bore bearings is not determined by the selected shaft fit tolerance, but is determined by the distance the bearing is propelled on the conical journal, bushing or withdrawal sleeve. Radial internal bearing clearance decreases as the bearing advances on the conical journal. By measuring the decrease value, the degree of interference and the tightness of the fit can be determined.
    When installing self-aligning ball bearings, CARB toroidal roller bearings, spherical roller timken bearings, and high-precision cylindrical roller bearings with tapered bore, determine the radial internal clearance reduction or the axial direction on the cone base Push distance as a measure of the amount of interference. Guidance values ​​for clearance reduction and axial advance distance, see related product section.
Small bearings
    Small bearings can use nuts to advance them to the cone base. In the case of bushings, sleeve nuts are used. The small withdrawal sleeve can be pushed into the bearing bore with a nut. Use a hook wrench or pneumatic wrench to tighten the nut. Before starting installation, add a little oil to the surface of the journal and sleeve.
Large and medium-sized bearings
Large timken bearings require significantly more installation force and should use hydraulic nuts and/or oil injection methods.
Both of the above methods can significantly simplify the installation process. The hydraulic nuts used for operation and the oil filling equipment required for the oil filling method are available. For detailed information on these products, refer to the relevant section of the online catalog “Maintenance and lubrication products”.
When using a hydraulic nut to install a bearing, it must be positioned on the threaded portion of the journal or on the sleeve so that the annular piston abuts against the inner ring of the bearing, the nut on the shaft, or the retaining ring mounted on the shaft end. The oil is pumped into the hydraulic nut by the oil pump to move the piston in the axial direction with the force required for safe and accurate installation. Use a hydraulic nut to mount the spherical roller bearing to
Using the oil injection method, the oil is injected between the timken bearing and the journal under high pressure to form a layer of oil film. This oil film separates the mating surfaces and significantly reduces the friction between the mating surfaces. This method is generally used when mounting the bearing directly on the conical journal, but it is also used for mounting the bearing on adapter sleeves and detachable sleeves that are specially prepared for the oil injection method. The oil pump or lubricator produces the necessary pressure to inject the oil between the mating surfaces through the grooves and the 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 mounted on the withdrawal sleeve with the oil groove, and the withdrawal sleeve is pressed into the bearing hole by injecting oil into the mating surface and tightening the screws one by one.