Electric bearing, also known as motor bearings or motor bearings, is specifically used in motor or motor on a special bearing. The bearing used in the motor is a part of the support shaft, which can guide the rotation of the shaft, or it can bear the parts that are idling on the shaft. There are four types of bearings commonly used in motors, namely rolling bearings, plain bearings, plain bearings and oil bearing. The most common motor bearing is a rolling bearing, that is, a bearing with a rolling element.

 

working principle

Motor bearings use smooth metal balls or rollers as well as lubricated inner and outer metal surfaces to reduce friction. These balls or rollers "carry" the load, supporting the motor spindle, so that the motor (rotor) can be smooth rotation.

 

Bearing type of use

Most small and medium-sized motors use rolling bearings. Large and medium models also use roller bearings. Small motor bearings at both ends of the ball bearings (such as deep groove ball bearings). Medium-sized motors are roller bearings (such as cylindrical roller bearings, tapered roller bearings, generally used for high load conditions) at the load end. Ball bearings are used on non-load terminals (but also in the opposite case, eg 1050 kW motors). Roller bearings are lubricated with grease, but are also lubricated with lubricating oil.

 

Bearing installation

Motor bearing installation is good or bad, will directly affect the bearing accuracy, life and performance. Therefore, please fully study the installation of bearings, that is, including the following items, including the operating standards for motor bearing installation.

● Clean the motor bearings and related parts, (for already lubricated bearings and double with oil seal or dust cover, seal bearing installation without cleaning before.

● Check the size and finishing of the relevant parts

 

installation method

The installation of the motor bearing shall be based on the bearing structure, the size and the matching properties of the bearing parts. The pressure shall be directly applied to the end of the ferrule, and the pressure shall not be transmitted through the rolling element. The installation of the motor bearing is generally carried out as follows:

1, press fit

Motor bearing inner ring and the shaft is tight fit, the outer ring and bearing hole is more loose fit, the press can be used to press the motor bearing on the shaft, and then the shaft together with the bearing into the bearing hole, When the inner surface of the motor bearing inner ring, pad a soft metal material to do with the fitting sleeve (copper or mild steel).

Motor bearing outer ring and the bearing hole hole, the inner ring and the shaft for the loose fit, the motor bearing can be pressed into the bearing hole, then the outer diameter of the assembly tube should be slightly smaller than the diameter of the seat hole.

If the motor bearing rings and shaft and seat holes are tight fit, the installation of the inner ring and outer ring to be pressed into the shaft and seat hole at the same time, the structure of the casing should be able to tighten the bearing inner and outer ring end The

 

2, heating with

By heating the motor bearing or bearing, the use of thermal expansion will be tight fit into loose fit with the installation method. Is a common and laborious installation method. This method is suitable for the installation of large motor bearing bearing, hot before the motor bearing or separable bearing rings into the tank evenly heated 80-100 ℃, and then removed from the oil as soon as possible to the shaft , In order to prevent cooling after the inner ring and shoulder fit is not tight, the motor bearing cooling can be followed by axial tightening. Motor bearing outer ring and light metal bearing seat tightly, the use of heating the bearing seat of the hot method, to avoid the mating surface is subject to abrasions.

When the motor is heated by the tank, there shall be a grid at a distance from the bottom of the tank, or the motor bearing shall be hung with a hook. The motor bearing can not be placed on the bottom of the box to prevent the impurity from entering the motor bearing or uneven heating. Must have a thermometer, strictly control the oil temperature shall not exceed 100 ℃, in order to prevent the occurrence of tempering effect, so that the hardness of the ring to reduce.