When the bearing inner ring is forced into the journal, the light will make the raceway at the bottom of the ring track serious wear, heavy in the slide, the outer ring and the ball will have cracks or peeling.

why

The clearance between the ball and the slide is too small, the torque increases, the friction increases, and the working temperature of the bearing is too high, which aggravates the wear and fatigue of the bearing and leads to its failure.

Prevent method

Restore the radial clearance of bearings to reduce the amount of interference.

There are two inspection methods for bearing assembly quality:

Visual method: when the bearing chamber of the motor end cover is installed with the bearing, and the end cover is rotated by hand, if the bearing rotates freely and flexibly, without vibration and rocking up and down, it is deemed qualified.

The plug gauge inspection method: the motor end cover equipped with bearings is assembled on the base stop port, and the radial clearance of the bearing is checked with a 0.03mm thick plug gauge. If the maximum clearance position is just above the middle (the motor is installed horizontally), it is assembled correctly and reliably, otherwise, it is poorly installed.Should be adjusted properly the end cover position, reassembly, until qualified.

2.Bad lubrication

The reason is the serious lack of grease or grease drying aging.Due to the friction heat generated by the motor in high speed operation, the bearing temperature is too high and the oxidation becomes discolored, which is shown as the ball, cage, inner ring and shaft journal of the bearing turn brown or blue.

Prevention method:

According to the motor running time, environmental temperature, load status, grease quality and other four factors, to determine its oil filling and oil change time.

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