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1) to match the requirements of bearing surface of bearing of shaft and hole on the mounting position, the surface roughness is low, shape and position accuracy is better, support rigidity are also more and more high. The surface to surface strengthening treatment, improve rigidity. With very low roughness and high hardness plug, to certain interference in lubrication times gently pressed into and out of a hole, but also conducive to improve the supporting rigidity, necessary clasp similar treatment of shaft neck.
(2) using bearing preloading method to improve the supporting rigidity of ball bearing or tapered roller bearing can take axial preloading method, while the short cylindrical roller bearing can take radial preload method, can significantly improve the bearing rigidity, the bearing clearance or eliminated, or get negative clearance. But the speed is not very high, conditions of temperature rise greatly, the best should state to small negative clearance.
In the pre - tight, should continue to measure the deformation, pay attention to low values in the phase of deformation, deformation increases with the pre tightening load is nonlinear; while in the high stage, with the increase of the load deformation is linear. Once the deformation load appears linear relationship, immediately stop adding pretightening load, now can obtain constant stiffness. Since then, a fixed relationship exists between the axial and radial rigidities, and is not dependent on external load.
Measurement of the deformation, can use such as 1000 header against the appropriate position of the bearing surface or axis, and observe the reading with the method of pretension load changes. Preloading method has its disadvantages, such as the friction torque of bearings increased, Wen Sheng increased, shortened life expectancy, so must consider comprehensively, weigh the pros and cons, choose appropriate preload.
(3) influence the configuration of the configuration of bearings bearing stiffness is also great, generally speaking, the centripetal thrust type ball bearings and roller bearings, in pairs to take the outer ring end face (that is, the larger the pressure line pressure cone tip) configuration, this configuration bearing anti overturning moment large, pre tension when the temperature changes have also little changed.
(4) the bearing in the axial position under the conditions allowed, as the radial support each pivot by two or more bearings, can improve the supporting rigidity. For example, recently in the machine tool spindle component, it is widely used in compact installation axial pre, several sets of radial thrust bearing is bearing the same pivot.