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Common problems with bearing installation

When mounting rolling bearings, it is strictly forbidden to strike the end faces of the bearings as well as the non-stressed surfaces directly with a hammer. With the help of presses, sockets or other specialized mounting tools, the bearings should be subjected to even pressure, and the mounting force should not be transmitted through the rolling elements.
The mounting process is smoother if the mounting surfaces are lubricated. If the degree of interference is large, the bearing should be placed in mineral oil, heated to 80 to 90°C, and then mounted as soon as possible. The temperature of the oil should be strictly controlled, not exceeding 100°C, to prevent tempering effects, which may reduce hardness and affect dimensional recovery. When dismantling is impeded, it is recommended to carefully pour hot oil on the inner ring while pulling it outwards with the dismantling tool. The heat will cause the inner ring of the bearing to expand, making it easier to remove it.

Not all bearings require the smallest working clearance, and the appropriate clearance must be selected according to the actual conditions. In the national standard 4604-93, the radial clearance of rolling bearings is divided into five groups, respectively -2 groups, 0 groups, 3 groups, 4 groups, 5 groups, the clearance value in accordance with the order from small to large, of which 0 groups belong to the standard clearance.
Basic radial clearance group for general operating conditions, conventional temperature and commonly used interference fit; in high temperature, high speed, low noise, low friction and other special conditions of work bearing, it is best to use a larger radial clearance; for the precision spindle, machine tool spindle bearings, etc., it is appropriate to use a smaller radial clearance; for roller bearings, you can keep a small amount of work clearance.
In addition, for the separation of the bearing, the clearance does not have practical significance; Finally, the bearing installed on the machine after the working clearance, will be smaller than the original clearance before installation, this is because the bearing in the rotation of the bearing to withstand a certain amount of load, and bearing fit as well as the load will produce the amount of elastic deformation.
To address the problem of sealing defects in bearings with inlaid seals, there are two steps that must be strictly enforced when adjusting them.
Adjust the mounting cap structure of the inlaid seal bearing to both sides of the bearing, start from the installation structure of the equipment bearing to adjust, no need to contact with the bearing directly, in the bearing outside of the dustproof treatment. The sealing effect of this structure is better than the sealing of the bearing itself sold by the bearing agent, which can directly cut off the intrusion path of particulate matter and ensure the cleanliness inside the bearing. At the same time, this structure expands the heat dissipation space of the bearing, and the damage to the anti-fatigue performance of the bearing is smaller.
Although the sealing effect of the external sealing method of the bearing is good, the heat dissipation path will be hindered to a certain extent, so it is necessary to install cooling components. The cooling device can reduce the operating temperature of the lubricant, and after cooling, the natural heat dissipation can prevent the bearing from operating in a high temperature state.