Timken bearings should be cleaned with gasoline or kerosene before installation, and used after drying, and ensure good lubrication. Bearings are generally lubricated with grease, but can also 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 volume of the cylindrical roller bearing and the bearing housing, and it should not be too much. The double row cylindrical 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. When the bearing is installed, an equal pressure must be applied on the circumference of the end face of the ferrule to press the ferrule in. It is not allowed to directly hit the end face of the Timken 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. Bearings must be installed in dry, clean ambient conditions. 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. When the interference is large, it can be installed by oil bath heating or inductor heating bearing method. 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 bearing from shrinking in the width direction after cooling and causing a gap between the ring and the shaft shoulder. At the end of the bearing installation, the clearance should be adjusted. The clearance value should be determined according to different operating conditions and the size of the interference. When necessary, tests should be carried out to determine. The double row cylindrical roller bearing and the water pump shaft bearing have already adjusted the clearance at the factory, and do not need to be adjusted again during installation. 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 operated with power without load and at low speed, and then gradually increase the rotation speed and load according to the operating conditions, and detect noise, vibration and temperature rise. , found abnormal, should stop the operation and check. It can be delivered for use only after the running test is normal. Contact fatigue failure is one of the most common failure modes of various imported bearings, which is the failure of the imported bearing surface under the repeated action of cyclic contact stress. Contact fatigue spalling on the surface of bearing parts is a process of fatigue crack initiation and propagation to cracks. The initial contact fatigue crack is first generated from the maximum orthogonal shear stress below the contact surface, and then propagates to the surface to form pitting or flaking. The former is called pitting or pitting; the latter is called shallow. layer peeling off. If the initial crack occurs in the boundary area between the hardened layer and the core, resulting in the early spalling of the hardened layer, it is called the spalling of the hardened layer. It is one of the most common failure modes for all types of bearing surfaces. The relative sliding friction between bearing parts leads to the continuous loss of surface metal, which is called sliding friction. Continued wear will change the size and shape of the parts, increase the fitting clearance of the timken bearing, and deteriorate the working surface appearance, thereby losing the rotation accuracy and making the cylindrical roller bearing unable to work normally. The forms of sliding wear can be divided into abrasive wear, adhesive wear, corrosive wear, fretting wear, etc., of which the most common are abrasive wear and adhesive wear.
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