Installation techniques for small tapered bearings

The installation of small tapered bearings must be carried out in dry and clean environmental conditions. Before installation, the machining quality of the mating surfaces of the shaft and housing, the end faces of the shoulders, grooves and connecting surfaces should be carefully checked. All mating connection surfaces must be carefully cleaned and deburred, and the unmachined surfaces of castings must be clean of molding sand.

Small tapered bearings should be cleaned with gasoline or kerosene before installation, dried before use, and ensure good lubrication. Bearings are generally lubricated with grease, but can also be lubricated with oil. When using grease lubrication, you should choose grease with excellent properties such as impurity-free, anti-oxidation, anti-rust, and extreme pressure. The grease filling amount is 30%-60% of the volume of the bearing and bearing box, and should not be too much. The double-row tapered roller bearings with sealed structure have been filled with grease and can be used directly by the user and cannot be cleaned.

When installing small tapered bearings, uniform pressure must be applied on the circumference of the end face of the ferrule to press the ferrule in. Do not use tools such as hammers to directly hit the end face of the bearing to avoid damaging the bearing. When the interference is small, you can use a sleeve to press the end face of the ferrule at room temperature, tap the sleeve with a hammer, and press the ferrule evenly through the sleeve. If installed in large quantities, a hydraulic press can be used. When pressing in, ensure that the end face of the outer ring is pressed tightly against the end face of the housing shoulder, and that the end face of the inner ring is pressed tightly against the end face of the shaft shoulder. No gaps are allowed.

When the interference is large, oil bath heating or sensor heating can be used to install the bearing. The heating temperature range is 80℃-100℃, and the maximum cannot exceed 129℃. At the same time, nuts or other appropriate methods should be used to tighten the bearing to prevent the bearing from shrinking in the width direction after cooling and causing a gap between the ferrule and the shaft shoulder.

The clearance of small tapered bearings should be adjusted at the end of installation. The clearance value should be specifically determined according to different usage conditions and the size of the interference fit. If necessary, tests should be conducted to confirm. The clearance of double row tapered roller bearings has been adjusted before leaving the factory, and there is no need to adjust it during installation. After the bearing is installed, a rotation test should be carried out. First, it should be used on the rotating shaft or bearing box. If there is no abnormality, then run with power at no load and low speed. Then, depending on the operating conditions, the rotation speed and load should be gradually increased, and the noise, vibration and temperature rise should be detected. If any abnormality is found, the operation should be stopped and checked. It can be put into use only after the operation test is normal.

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