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Installation of tapered roller bearings and water pump shaft bearings

by:JNSN     2021-12-28
The installation of tapered roller bearings and water pump shaft bearings should pay attention to the following aspects:   1. Bearing installation:   The installation of bearings must be carried out under dry and clean environmental conditions. Before installation, carefully check the processing quality of the mating surface of the shaft and the housing, the end surface of the shoulder, the groove and the connecting surface. All mating and connecting surfaces must be carefully cleaned and deburred, and the unprocessed surface of the casting must be cleaned of residual sand.  The bearing should be cleaned with gasoline or kerosene before installation, and used after drying, and ensure good lubrication. The bearing is generally lubricated with grease, but also can be lubricated with oil. When grease lubrication is used, greases with high-quality properties such as no impurities, anti-oxidation, anti-rust, and extreme pressure should be selected. The amount of grease filled is 30%-60% of the volume of the bearing and the bearing box, and should not be too much. The sealed double-row tapered roller bearing and the water pump shaft bearing have been filled with grease and can be used directly by the user without cleaning.   When installing the bearing, an equal pressure must be applied to the circumference of the end face of the ring to press the ring in. It is not allowed to directly knock the end face of the bearing with a tool such as a head to avoid damage to the bearing. In the case of small interference, the end face of the bearing ring can be pressed with a sleeve at room temperature, and the sleeve can be beaten with a shovel to press the ring in evenly through the sleeve. If installed in large quantities, hydraulic presses can be used. When pressing, ensure that the end face of the outer ring and the shoulder end face of the housing, and the end face of the inner ring and the shaft shoulder end face are pressed tightly, and no gap is allowed.   When the interference is large, it can be installed by oil bath heating or induction heating bearing method. The heating temperature range is 80℃-100℃, and the highest can not exceed 120℃. At the same time, use nuts or other appropriate methods to tighten the bearing to prevent the bearing from shrinking in the width direction after cooling and causing a gap between the ring and the shaft shoulder.  Single row tapered roller bearing should be adjusted for clearance at the end of installation. The clearance value should be specifically determined according to different operating conditions and the size of the matching interference. If necessary, it should be tested to determine. The double-row tapered roller bearings and the water pump shaft bearing have been adjusted to the clearance before leaving the factory, so there is no need to adjust them during installation. After the bearing is installed, a rotation test should be carried out. First, rotate the shaft or bearing box by hand. If there is no abnormality, use the power to run at low speed without load, and then gradually increase the rotation speed and load according to the running situation, and detect noise, vibration and temperature rise If abnormality is found, stop the operation and check. It can be delivered to use only after the operation test is normal.   2. Bearing disassembly:    When the bearing is to be used after being removed, an appropriate disassembly tool should be used. When disassembling the inner ferrule with interference fit, only the pulling force can be applied to the ferrule, and it is never allowed to transmit the disassembly force through the rolling element (outer ring), otherwise the rolling element and raceway will be crushed.  3. Bearing service environment:    According to the location of use, service conditions and environmental conditions, the selection of specifications, size and accuracy, matching with appropriate bearings is the prerequisite to ensure bearing life and reliability. 1. Part of use: Tapered roller bearings are suitable for bearing combined radial and axial loads based on radial loads. They are usually paired with two sets of bearings. They are mainly used for automobile front and rear hubs, active bevel gears, and differentials. Transmission parts such as gearboxes and reducers.  2. Allowable speed: Under the environment of correct installation and good lubrication, it is allowed to be 0.3-0.5 times the limit speed of the bearing. Under normal circumstances, 0.2 times the limit speed is the most appropriate.  3. Allowable tilt angle: Tapered roller bearings generally do not allow the shaft to be tilted relative to the housing hole. If tilted, the maximum is not more than 2'.  4. Allowable temperature: Under normal load, the lubricant has high temperature resistance and sufficient lubrication, the general bearing is allowed to work at an ambient temperature of -30℃---150℃.
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