Whether the electric motor bearing is installed or not will directly affect the accuracy, life and performance of the bearing. Therefore, please fully study the bearing installation, that is, please install the bearing according to the operating standards including the following items.

●, clean the bearing and related parts, (for the grease lubricated bearing and both sides with oil seal or dust cover, the seal ring bearing does not need to be cleaned before installation.)

●, check the size and finishing of related parts

●, installation method

The installation of the bearing should be determined according to the bearing structure, size and the matching nature of the bearing components. The pressure should be directly applied to the end face of the ferrule with a tight fit, and the pressure should not be transmitted through the rolling elements. The bearing installation generally adopts the following methods:

a. Press fit

When the inner ring of the bearing and the shaft are tightly fitted, and the outer ring and the bearing seat hole are loosely fitted, the bearing can be press-fitted on the shaft first, and then the shaft together with the bearing is installed into the bearing seat hole. An assembly sleeve (copper or mild steel) made of soft metal material is placed on the end face of the inner ring of the bearing.

The outer ring of the bearing is tightly fitted with the bearing seat hole, and when the inner ring and the shaft are loosely fitted, the bearing can be pressed into the bearing seat hole first. At this time, the outer diameter of the assembly sleeve should be slightly smaller than the diameter of the seat hole.

If the bearing ring is tightly fitted with the shaft and the seat hole, the inner ring and the outer ring should be pressed into the shaft and the seat hole at the same time.

b. Heating coordination

A mounting method that uses thermal expansion to convert a tight fit into a loose fit by heating the bearing or housing. It is a common and labor-saving installation method. This method is suitable for the installation of bearings with large interference. Before hot-loading, put the bearing or the ferrule of the separable bearing into the oil tank and evenly heat it at 80-100 °C, then take it out of the oil and install it on the shaft as soon as possible. To prevent the end face of the inner ring and the shaft shoulder from not fitting tightly after cooling, the bearing can be axially tightened after cooling. When the outer ring of the bearing is tightly fitted with the bearing seat made of light metal, the hot-fitting method of heating the bearing seat can be used to prevent the mating surface from being scratched.

When heating the bearing with the oil tank, there should be a mesh grid at a certain distance from the bottom of the box, or hang the bearing with a hook. The bearing cannot be placed on the bottom of the box to prevent heavy impurities from entering the bearing or uneven heating. There must be a thermometer in the oil tank. Strictly control the oil temperature not to exceed 100 ℃ to prevent the tempering effect and reduce the hardness of the ferrule.