Test Method for Axial Clearance of Tapered Roller Bearings
What is Bearing Axial Clearance?
Bearing axial clearance is an important technical index in the application of double and four-row tapered roller bearings. It has a direct impact on the service life of bearings. The conversion and adjustment methods of radial clearance and axial clearance of double and four-row tapered roller bearings are provided in “Double-row and Four-row Tapered Roller Bearings Clearance and Adjustment Method”, namely, separate measurement method.
Clearance Test Method
The clearance of double and four-row tapered roller bearings is too small. It is easy to cause serious bearing failure accidents. The host users often need to recheck the axial clearance. When measuring the axial clearance of double and four-row tapered roller bearings according to the “Separate Body Method” stipulated in the standard. The height rule is used to determine the distance between the ring end face and the measuring platform. Various production enterprises and host users explore various alternative measurement methods in practical application. “Integral Method” is widely used by host users.
The measurement practice shows that: When measuring the axial clearance of double and four row tapered roller bearings. The measurement error of “Integral Method” and “Separate Method” is about 0.01~0.10 mm . The difference of measured values obtained by different measurement methods forces bearing manufacturers. To increase the axial clearance value during clearance configuration to “match” the user measurement method. Resulting in the actual clearance of bearings greater than the measured value. Thus reducing the bearing rotation accuracy. Increasing the vibration and noise of bearings during operation. And ultimately reducing the bearing life.
Actual Operation
Some companies adopt the “Bulge Measure Method” in the clearance measurement of double and four row tapered roller bearings without spacer ring. And develop special measuring instruments. The calculation principle of the measurement method is the same as that of the “Separate Body Method” stipulated by the standard. In the measurement, the end face of the ring is positioned without reciprocating leveling.
3 meter stand reading at the same time, measurement 3 times can obtain 3 groups of 9 data. The measurement efficiency is greatly improved. And the accuracy requirements of the measuring platform are relatively low. It is convenient to carry out measurement in the bearing application field. At present, this measurement method has been extended to the clearance measurement of double and four row tapered roller bearings of various structural types.
Many four-row tapered roller bearings are of large size. So the measurement of axial clearance by “Separate body method” is more tedious and time-consuming. The measurement principle of “separate body method” for axial clearance of four-row tapered roller bearings is the same as that of “separate body method” for double-row tapered roller bearings. And “projection method” can also be popularized to improve the measurement efficiency more greatly.
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