To achieve better performance and long-term use of bearings, first of all, you need to understand the correct installation and disassembly of bearings. Secondly, bearing maintenance is important. The best thing is that without maintenance, rust can occur!

Installation of bearings:

The installation of bearings must be carried out in a clean and tidy condition. Before installation, the mating surface of the shaft and housing, the end face of the shoulder, the groove, and the machining quality of the connecting surface should be carefully inspected. All connecting surfaces must be carefully washed and burrs removed, and the unprocessed surface of castings must be cleaned of molding sand.

Before installing the bearing device, it should be washed clean and applied after cleaning, ensuring good lubrication. The bearings are also lubricated with grease or oil. When using lubrication, lubricating grease with good properties such as impurity free, antioxidant, rust proof, and extreme pressure should be selected. The amount of grease filling should be 30% -60% of the capacity of the bearing and bearing box, and should not be used in moderation. The double row tapered roller bearings with sealed structure and the water pump shaft connecting bearings have been filled with lubricating grease, and users can apply them directly without stopping washing.

When installing the bearing device, equal pressure must be applied on the circumference of the ring end face to press the ring in. Do not use tools such as hammers to directly hit the bearing end face to avoid damaging the bearing. In the case of small interference, a sleeve can be used to press the end face of the bearing ring at room temperature, and a hammer can be used to tap the sleeve. After the process, the sleeve can evenly press the ring in. If there is a large-scale installation, hydraulic presses can be used. When pressing in, it should be ensured that the outer ring end face is tightly pressed against the outer shell shoulder end face, and the inner ring end face is tightly pressed against the shaft shoulder end face, without any gap allowed.

When the interference fit is large, oil bath heating or sensor heating method can be used to install the bearing, with a heating temperature range of 80 ℃ -100 ℃, and the maximum temperature should not exceed 120 ℃. At the same time, use nuts or other appropriate methods to tighten the bearings to prevent tightening in the width direction after cooling, which may cause a gap between the collar and the shaft shoulder.

The scheduling of clearance should be stopped at the end of the tapered roller bearing device. The clearance value should be determined specifically based on different application conditions and the size of the interference fit. If necessary, the test should be stopped to determine. The clearance of the double row tapered roller bearings and the water pump shaft connecting bearings has been adjusted before leaving the factory, and there is no need to adjust them during installation.

The bearing device should stop the rotation test, first used for rotating the shaft or bearing box. If there are no abnormalities, the energy should be used to stop the no-load and low-speed operation. Then, depending on the operation situation, the rotation speed and load should be gradually increased, and noise, vibration, and temperature rise should be detected. If any abnormalities are created, the operation should be stopped and checked. The application can only be delivered after the abnormal operation test.

Dismantling of bearings:

When the bearing is to be inherited for application after removal, appropriate equipment and tools should be selected. The collar of the device with interference fit can only apply tension to the collar, and it is not allowed to transfer the device force through the process of migration to the variant, otherwise both the migration to the variant and the raceway will be crushed.

Maintenance and upkeep of bearings

Care and inspection of bearings

In order to maintain the original function of the bearings in a superior condition as long as possible, it is necessary to take care of, inspect, and prevent them from becoming chaotic, ensuring the reliability of operation, and improving productivity and economy. The homework scale for the best response to the premise of machine operation in Yiyang should be stopped on schedule. The content includes monitoring the operation status, repairing or replacing the smoothing agent, and reflecting on the scheduled assembly.

As an inspection task during operation, there are factors such as the torsional sound, vibration, temperature, and condition of the lubricant in the bearings.

Damage to bearings and countermeasures

As usual, if bearings are accurately applied, they can be applied until their fatigue life is reached. But there will be unexpected premature damage, which is not suitable for application environments. This type of late damage is absolutely related to fatigue and lifespan, and imposes restrictions on the application of virtues known as defects or disorders. It is often caused by carelessness in the device, application, and smoothness, foreign objects invading from the outside, and insufficient research on the thermal effects on the shaft and casing.

For the damage condition of bearings, such as the jamming of the ring guard edge of roller bearings, the reasons can be considered, such as insufficient lubricant, unsuitability, defects in the oil supply and drainage structure, foreign object intrusion, deviation of the bearing device, and excessive deflection of the shaft, which can also be caused by overlapping reasons

Therefore, it is difficult to determine the true cause of the damage by only investigating and visiting the damaged bearings. However, if we know the application machine of the bearing, the application premise, the structure around the bearing, the environment before and after the occurrence of the change, the damage condition of the joint bearing, and several reasons for the assessment, we can prevent similar changes from happening again.

Application of bearings:

The specifications, dimensions, and accuracy are determined based on the application location, application premise, and situation. Matching suitable bearings is a prerequisite for ensuring the bearing's lifespan and reliability.

1. Application area: Conical roller bearings are suitable for bearing combined radial and axial loads mainly based on radial loads. They are usually paired with two sets of bearings and are suitable for transmission parts such as front and rear wheel hubs, active bevel gears, differentials, and reducers of automobiles.

2. Permissible speed: Under the condition of precise and smooth device, it is allowed to be 0.3-0.5 times the maximum speed of the bearing. In the same ordinary abnormal situation, it is most appropriate to use a maximum speed of 0.2 times.

3. Permissible tilt angle: The tapered roller bearing is also ordinary and does not allow the shaft to tilt relative to the housing hole. If there is a tilt, the maximum should not exceed 2 '.

4. Permissible temperature: Under the premise of withstanding abnormal loads, with the lubricant having high temperature resistance and sufficient lubrication, ordinary bearings are allowed to operate at temperatures between -30 ℃ and 150 ℃.

Notes on the application of bearings

(1) Adhere to the cleanliness of bearings and their turnover

Even small dust that cannot be seen by the eyes can have a negative impact on the inlet bearing. Therefore, it is important to maintain cleanliness around the edges to prevent dust from entering the inlet bearings.

(2) Be careful when applying applications

When the axis is subjected to severe impact in the application, scars and indentations may occur, which becomes the cause of the disorder. In severe environments, cracks and fractures may occur, so it is necessary to pay attention.

(3) Apply appropriate manipulation tools

To prevent replacement with existing tooling, appropriate objects must be applied. We often exaggerate the importance of objects because too many customers have applied incorrect objects in the device, causing damage to the inlet bearings. Pay attention to the rusting of bearings

(4) When manipulating bearings, sweat on the hands can become the cause of rust. Pay attention to operating with clean hands, and it is best to wear gloves even if necessary.