Home>Bearing knowledge>How to adjust the clearance by controlling the pre-tightening of the bearing

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The method of controlling the pre-tightening amount of the bias bearing

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Bearings in the process of the device to control the preload amount are mainly angular touch ball bearings, painful bearings, tapered roller bearings, tapered double row cylindrical rollers, etc.; in the final period of these types of bearing devices; To adjust the clearance; that is, to control the preload (load); especially for the shaft of the machine, which has strict requirements on the rotation accuracy, noise and temperature rise; not only the pre-tightening amount (load) adjustment clearance in the initial device And also need to adjust in the application. Pre-tightening control methods are more; the following are several ways to control the pre-tightening amount to adjust the clearance.
(1) Measuring the starting conflict torque of the painful bearing; pre-measuring the relationship between the starting conflict torque of the bearing and the axial load; adjusting the pre-tightening amount by controlling the starting conflicting torque; the shaft of the tapered roller bearing commonly used for the paired device Preload
(2) Measuring the axial displacement of the bearing; pre-measuring the relationship between the axial load and the axial displacement of the tapered bearing; and adjusting the preload by manipulating the axial displacement
(3) Measuring the deformation amount of the pre-tightening spring; pre-measuring the relationship between the load of the spring and the deformation; adjusting the load of the constant pressure preload by controlling the deformation amount
(4) Measuring the tightening torque of the nut; when pre-tightening the bearing with the nut; adjusting the pre-tightening amount with the tightening torque of the steering nut
(5), use the bearing end cover to pad; the end of the bearing will be tightened; the other end of the bearing will not be placed in the gasket; tighten the screw; when the shaft can not be freely changed; clarify that there is no play in the shaft system; Measure the gap between the end cap and the end of the bearing housing; add this value to the required clearance value is the thickness of the gasket
(6), the middle distance sleeve is selected; the length of the inner ring spacer can be calculated from the length of the outer ring of the bearing and the supporting scale; it can also be tested to determine the preloading load of the pain bearing is more difficult; Outside of the test; mostly use the dial gauge to measure the axial direction of the shaft; radial displacement or measure the starting conflict torque to detect; some foreign bearing companies have always been at the optimum value for the preloading load; use special instruments and some layout pairs Tight load is detected and adjusted; the preload load is controlled.

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