How to install tapered roller bearings?

The installation of bearings must be carried out under dry and clean environmental conditions. Before installation, carefully inspect the mating surface of the shaft and housing, the end face of the shoulder, the groove, and the processing quality of the connecting surface. All mating surfaces must be carefully cleaned and deburred, and any remaining molding sand must be removed from the unprocessed surface of the casting.

Before installing bearings, they should be cleaned with gasoline or kerosene, dried before use, and ensure good lubrication. Bearings are generally lubricated with grease or oil. When using grease lubrication, high-quality lubricating grease with no impurities, anti-oxidation, rust prevention, extreme pressure and other properties should be selected. The filling amount of lubricating grease should be 30% -60% of the volume of the bearing and bearing housing, and should not be too much. The double row tapered roller bearings with sealed structure and the water pump shaft connecting bearings have been filled with lubricating grease and can be used directly by users without further cleaning.

When installing bearings, equal pressure must be applied on the circumference of the ring end face to press the ring in. Do not use tools such as pliers to directly strike the bearing end face to avoid damaging the bearing. In the case of small interference fit, a sleeve can be used to press the end face of the bearing ring at room temperature, and the sleeve can be tapped with a hammer to evenly press the ring through the sleeve. If installing in large quantities, hydraulic presses can be used. When pressing in, it should be ensured that the outer ring end face is tightly pressed against the outer shell shoulder end face, and the inner ring end face is tightly pressed against the shaft shoulder end face, with no gaps allowed.

When the interference fit is large, oil bath heating or sensor heating bearing methods can be used for installation, with a heating temperature range of 80 ℃ -100 ℃ and a maximum of 120 ℃. At the same time, nuts or other appropriate methods should be used to tighten the bearings to prevent them from contracting in the width direction after cooling, resulting in a gap between the ring and the shaft shoulder. The clearance adjustment should be carried out after the installation of single row tapered roller bearings. The clearance value should be determined specifically based on different operating conditions and the size of the interference fit. If necessary, experiments should be conducted to determine. Double row tapered roller bearings and water pump shaft connecting bearings have their clearance adjusted at the factory and do not need to be adjusted during installation.

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