The stress analysis of crankcase

According to the stress analysis of the crankcase, consider the strength, confirm the deformation amount and bearing clearance of crankcase and bearing, calculating miniature linear bearings life, and try to optimize the bearing and axle box.
The maximum deformation of 1.5MW four point contact ball slewing bearing and axle radial fan for 0.07mm. Considering the calculation results of deformation and bearing clearance  and the crankcase as steel body life difference within 5%, this value in practice is not a problem. The life of difference, life is shortened, then, must change the axle box design, improve the rigidity.

Mainstream of bearing types

For bearing types,linear plain bearings and mobile crane bearing is the mainstream, but most of the use of self-aligning roller bearings in the non linear favorable. Non linear spindle generally need to consider the plus or minus 0.5 degrees.
As B type automatic self-aligning roller bearing  is designed by the use of the middle block side guide roller , it is no skew of the maximum load wide in the minimum load to load region , which can run in a stable torque and low fever cases.
In addition,vibration of blade and gear box vibration increasing of the rotor thin wall bearings, there is danger of corrosion and friction .Therefore, optimal bearing selection and clearance and mating and selection of suitable oil is very important.

Study on the thermal characteristics of rotary bearing

The friction heat of spindle bearings significantly influence the speed and the dynamic performance of the rotary bearing unit, is restricting the main factors to improve the machining efficiency and precision.
To build up the heat transfer equations, the friction heat and temperature distribution calculation of bearing, thermal characteristics research of bearing, and its impact on the speed and dynamics is an important topic with theoretical
and practical significance.
In this paper, based on the heat transfer, tribology of agricultural bearings and rotor dynamics as the theoretical basis,taking the GDZ48A type electric spindle as an example, establishes the spindle bearing considering the effect of friction heat and pre tightening mode quasi dynamics analysis model, analyzes the bearing friction torque, motor, load and stiffness, study the influence of thermal characteristic, tower crane bearing design and application parameters on the speed and dynamics, and validated by experiments.

ball and roller combined bearing

ball and roller combined bearing dynamics performance study  including ,
1) dynamic analysis of pseudo bearing, the establishment of improved quasi dynamics analysis method, considering the effect of friction heat and pre tightening mode, calculation of bearing load, motion, displacement, friction torque and friction heat equation.
2) calculation of bearing temperature distribution, using heat transfer theory, the establishment of the spindle unit of heat transfer model, derives the heat transfer resistance and heat transfer equation.
3) thin section bearing operation performance calculation, the effects of example calculation and thermal characteristics, analysis of bearing design parameters and Preload Method on operation performance.