1. How to install tapered roller bearings:
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 cleaned of residual molding sand.
Before installation, the bearing should be cleaned with gasoline or kerosene, used after drying, and ensure good lubrication. The bearing is generally lubricated with grease or oil. When using grease lubrication, the grease with high 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 used directly 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, and it is not allowed to directly hit the end face of the bearing with a hoe or other tool 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 normal temperature, the sleeve can be hit with a hoe, and the ring can be pressed in evenly through the sleeve. If a large number of installations, 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. When the interference is large, it can be installed by oil bath heating or inductor heating bearing method. The heating temperature range is 80°C-100°C, and the maximum cannot exceed 120°C. At the same time, tighten the bearing with nuts or other appropriate methods to prevent the bearing from shrinking in the width direction after cooling and causing a gap between the ring and the shaft shoulder.
The clearance adjustment should be carried out at the end of the installation of the single row tapered roller bearing. 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 tapered roller bearing and the water pump shaft bearing have been adjusted for clearance at the factory, and do not need to be adjusted 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, run it 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. , 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.
2. Bearing disassembly:
When the bearing is to be continued to be used after being removed, an appropriate removal tool should be selected. When disassembling the inner ferrule with interference fit, only the pulling force can be applied to the ferrule, and it is not allowed to transmit the disassembly force through the rolling element (outer ring), otherwise the rolling element and the raceway will be crushed.
3. The use environment of the bearing:
According to the use location, use conditions and environmental conditions, select the size and accuracy, and cooperate with the appropriate bearing is the premise to ensure the bearing life and reliability.
1. Use parts: Tapered roller bearings are suitable for bearing combined radial and axial loads mainly based on radial loads. They are usually used in pairs with two sets of bearings. They are mainly used in front and rear wheel hubs, driving bevel gears, differential gears of automobiles. Gearboxes, reducers and other transmission parts.
2. Allowable rotational speed: Under the environment of correct installation and good lubrication, it is allowed to be 0.3-0.5 times the limit rotational speed of the bearing. - Under normal circumstances, the limit speed of 0.2 times is the most appropriate.
3. Allowable inclination angle: tapered roller bearings generally do not allow the shaft to be inclined relative to the housing hole. If there is an inclination, the maximum shall not exceed 2 degrees.
4. Allowable temperature: Under normal load, and the lubricant has high temperature resistance and sufficient lubrication, the general bearing is allowed to work at an ambient temperature of 30°C---150°C.
4. The installation method of tapered roller bearings
1. Installation method of thrust tapered roller bearing
Thrust cylindrical roller bearings and thrust needle roller bearings are suitable for occasions with low rotational speed, thrust tapered roller bearings with slightly flatter rotational speeds, and thrust bearings mainly bear axial loads in the assembly, and are widely used. Although the thrust bearing installation operation.
2. How are gears and tapered roller bearings assembled?
When designing the gear, there should be an axial positioning step, the outer ring of the bearing is closed, and the outer side of the inner ring is locked with a lock nut, and the pre-tightening force of the lock is set according to the application conditions.
3. How to install and adjust the clearance of tapered roller bearings?
Generally, tapered roller bearings are used, both face-to-face and back-to-back. The size of the clearance should be determined according to the size of the bearing you choose and the transmission accuracy required by the mechanism to select the clearance group! As for the adjustment method, it can be realized by pressing and loosening.