1 Measurement and adjustment of radial clearance

In order to ensure that the radial clearance of the inner ring, roller and shaft radial thermal expansion of the running bearing is not too large or too small, to prevent the change of the installation clearance in the later stage, the following measurements should be taken. When the specified installation clearance is not reached, re-adjust to the specified installation clearance according to the regular installation method.

A Heat-mounted bearing requires that the shaft and bearing be isothermally measured again to install the clearance.

B Measure the installation clearance again before installing the lock washer.

C When the hydraulic nut is replaced with a lock nut, the installation clearance is measured again.

D After the oil pressure of the oil pump is unloaded, measure the installation clearance again.

How to install and adjust the spherical roller bearing

2 Spherical positioning and adjustment of spherical roller bearings

(1) Pressing method of inner ring of spherical roller bearing

A tapered shaft is directly press-fitted with a lock nut, end cap, end cap or hydraulic nut;

B tightening the bearing directly with the lock nut or hydraulic nut;

C Retraction Bushing Use a shaft locknut or hydraulic nut to press the relief bushing to mount the bearing.

(2) Setting and implementation of axial clearance

Unit: (10-6) m / ° C

How to install and adjust the spherical roller bearing

Material thermal expansion coefficient

According to the material used for the shaft and the thermal expansion coefficient of the material of the bearing housing (housing) and the working temperature, the axial expansion of the temperature rise is calculated separately. The difference between the expansion of the two is due to the operating temperature difference between the shaft and the housing and the thermal expansion coefficient of the material. The axial misalignment of the inner and outer rings of the bearing caused by the difference. Due to the large thermal expansion force of the metal material, it is irresistible. If the axial preload force of the spherical roller bearing is superimposed on the axial force generated by the thermal expansion of the shaft, the bearing will inevitably be damaged by the huge axial force. The superimposed axial forces are not tolerated even by thrust bearings.

In order to avoid damage to the spherical roller bearing subjected to huge axial force, the axial clearance required for thermal expansion of the shaft must be left between the end cap of the bearing end and the end face of the outer ring of the bearing when the bearing is installed, while ensuring swimming The outer diameter of the end bearing is matched with the small hole of the seat hole to ensure the axial displacement (axial creep) of the swimming end bearing when the shaft is thermally expanded. When a spherical roller bearing with a fixed end at both ends of the shaft is installed, an axial gap should be left between the bearing end cover at both ends of the shaft and the end face of the bearing outer ring. The outer diameter of both ends of the bearing and the seat hole should be small clearance fit. .

After the bearing is installed, the radial installation clearance should be no less than the remaining clearance; the axial installation clearance is not less than the maximum thermal expansion of the shaft, and the axially rotating parts do not interfere with the non-rotating parts when the axial displacement is ensured.

How to install and adjust the spherical roller bearing

In the illustration: When a set of spherical roller bearings is combined with two sets of tapered roller bearings arranged back to back, in order to avoid axial load on the spherical roller bearings, it is recommended that the radial clearance of tapered roller bearings in back-to-back configuration is less than or equal to For the installation clearance of the spherical roller bearing, the outer diameter of the spherical roller bearing and the seat hole should be a small clearance fit, and an axial gap should be left between the bearing end cover and the outer ring end of the spherical roller bearing.