The measurement and adjustment method of the bearing clearance

Bearing clearance is one of the important quality index of the rolling bearings, and bearing clearance adjustment is the key to install technology, related to the bearing in the equipment running status. Bearing clearance measuring, testing and adjustment is an important part of bearing used in hope to bring us some practical reference significance in this paper.

What is the bearing clearance?
Rolling bearing inner and outer ring and there is a certain gap between rolling body, so can have relative displacement between inner and outer ring, bearing clearance. And measurement methods, depending on the type of bearing clearance can be classified into radial clearance and axial clearance.



Why do you want to measure and adjust the bearing clearance?
Bearing clearance and its service life is closely linked, under laboratory conditions, the slight negative space, the service life of bearing is highest, but if bearing temperature and installation position not sure, generally recommended to choose large clearance.
Install the bearing clearance, when clearance is too small, rolling bearing temperature, not work properly, can lead to roller jammed; When the clearance is too large, large equipment vibration, will cause the noise of rolling bearings, the appropriate clearance helps the normal work of the rolling bearing.

Bearing clearance measurement methods mainly include: special instrument measuring method, simple measuring method and feeler method. Specific adjustment method: to facilitate the measurement, should be removed before the adjustment on both sides of bearing gland, install the bearing housings, cover up and cover, using a torque wrench fastening bolt bearing four on both sides, tighten in place, after using a feeler gauge measurement, the measured values and standard values of look-up table.
Bearing clearance and life diagram

Bearing clearance measurement
Bearing clearance measurement methods mainly include: special instrument measuring method, simple measuring method and feeler method.
Feeler method is the most commonly used method, when the determination of the bearing clearance, bearing vertical platform, pressure bearing outer ring with the hand, keep the inside and outside the ring did not tilt, turn right or left 1/2-1 ring, inner ring roller is stable. Then around the column of any roller respectively into the upper, using a feeler internal clearance.
Adjust bearing clearance
By changing the relative axial or radial raceway position, to adjust the clearance of the bearing is always working in a stable range, so as to improve its working life. The following adjustment method can be used as reference:

(1) the axial clearance adjustment
Fixing bearing inner ring by the shoulder, on either side of the outer ring by preloaded bearing gland, axial clearance of bearing by prestressing force on both sides of the bearing gland and adjustment, considering the bearing clearance decrease caused by fever, bearing the axial certain clearance shall be maintained.
In practice, the axial clearance due to the interference assembly, with little impact on factors such as load, so the installation, take the original clearance of bearing is a standard to adjust.

(2) the radial clearance adjustment
Bearing radial clearance of bearing the stable operation of play a crucial role, for the radial clearance, can refer to GB/T4604-2006 standards, in the actual operation, only in accordance with the standard adjustment bearing radial clearance on the floor.
Specific adjustment method: to facilitate the measurement, should be removed before the adjustment on both sides of bearing gland, install the bearing housings, cover up and cover, using a torque wrench fastening bolt bearing four on both sides, tighten in place, after using a feeler gauge measurement, the measured values and standard values of look-up table.

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