The precision bearing with dust cover is not suitable for the hot-loading method, and the hot-loading temperature does not exceed 80 ℃. If the bearing is heated above 125°C, it is easy to cause partial quenching of the bearing. The bearing must stay for 2 minutes after the bearing is heated in place, otherwise the bearing will spring back by 0.05~0.15mm. The radial oil clearance must be checked when the bearing is cold-fitted. Use a feeler gauge to insert 2/3 to ensure uniform clearance and prevent eccentric load. The tolerance of the inner and outer diameters of the bearing should be checked, otherwise it will easily lead to changes in the radial oil gap and affect the bearing life.

Do a good job of centering, and concentricity affects the life of precision bearings. Europe estimates that 34% is due to alignment. It is not advisable to add too much lubricating oil, which will affect the heat dissipation, and the thickness of the oil film is only 0.2 μm. 36% of the damage was caused by poor lubrication. 16% were bearing failures due to improper installation. Calculation of the amount of refueling: 0.005DB=gp, the amount of side filling GpD=bearing diameter B=bearing width.

The cooperation between the outer ring sealing groove and the sealing ring lip is designed with axial positioning and lateral compression. This method can avoid excessive deformation of the outer ring due to the excessive compression of the outer ring sealing lip, The ovality of the ring is out of tolerance, and it has the characteristics of low assembly pressure and easy assembly. There are generally two ways of matching the inner ring and the sealing lip of the precision bearing, the contact seal in which the inner ring sealing lip is in contact with the inner ring rib, and the non-contact seal in which the inner ring sealing lip and the inner ring rib are in contact.

Compared with the non-contact seal, the contact seal has better dust-proof and grease leakage effect, but its friction torque is large and the temperature rise is high. Considering that the friction torque is large and has an adverse effect on the robot host, the non-contact seal is generally used in the design. structure. In addition, due to the thin wall of the bearing ring, when processing the sealing groove, the inner and outer rings of the bearing are easily deformed. The inner ring rib adopts a grooveless structure, but the sealing gap should be strictly controlled.