The use and installation precautions of cylindrical roller bearings

Cylindrical roller bearings are widely used in large and medium-sized motors, locomotives, machine tool spindles, internal combustion engines, generators, gas turbines, gearboxes, rolling mills, vibrating screens, and hoisting and transportation machinery. Cylindrical roller bearing models are: skf nj2216ecm/c3, fag n1010-k-m1-sp, timken 419, etc. Installation Precautions First Precautions: The installation of the bearing must be carried out in a dry and clean environment. Before installation, the machining quality of the mating surfaces of the shaft and the housing, the end faces of the shoulders, the grooves and the connecting surfaces should be carefully checked. All mating surfaces must be carefully cleaned and deburred, and unmachined surfaces of castings must be free of sand. Second note: Before the bearing is installed, it should be cleaned with gasoline or kerosene, used after drying, and ensure good lubrication. Cylindrical roller bearings are generally lubricated with grease, but also can be lubricated with oil. When using grease lubrication, the grease with excellent performance such as no impurities, anti-oxidation, anti-rust and extreme pressure should be used. The filling amount of grease is 30%-60% of the bearing and bearing housing volume, and should not be too much. The double row tapered roller bearing with sealed structure and the water pump shaft bearing have been filled with grease, which can be directly used by the user and cannot be cleaned again. The third note: When the bearing is installed, an equal pressure must be applied on the circumference of the end face of the ferrule, and the ferrule must be pressed in. Do not directly hit the end face of the bearing with tools such as a hammer to avoid damage to the bearing. In the case of a small amount of interference, the end face of the bearing ring can be pressed with a sleeve at room temperature, and the sleeve can be hit with a hammer head to press the ring evenly through the sleeve. If installed in large quantities, hydraulic presses can be used. When pressing in, it should be ensured that the end face of the outer ring and the end face of the shoulder of the shell, and the end face of the inner ring and the end face of the shaft shoulder are pressed tightly, and no gap is allowed. Fourth note: When the amount of interference is large, oil bath heating or sensor heating bearing method can be used for installation. The heating temperature range is 80℃-100℃, and the maximum cannot exceed 120℃. At the same time, tighten the bearing with nuts or other suitable methods to prevent the cylindrical roller bearing from shrinking in the width direction after cooling and causing a gap between the ring and the shaft shoulder. Fifth note: After the bearing is installed, a rotation test should be carried out. First, it should be used for the rotating shaft or bearing box. If there is no abnormality, it will be run with power without load and at a low speed, and then gradually increase the rotation speed and load according to the operating conditions, and detect noise. , vibration and temperature rise, if any abnormality is found, the operation should be stopped and checked. It can be delivered for use only after the running test is normal.

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