| Tunnel shield is the main machine in the tunnel construction. It must have high reliability, and work stable. The bearing of large tunnel shield always adopts slew bearing, and must support large axial force, tipping moment and radial force at the same time during working. Its loads circumstance is complex, can bring large distortion, and affects the safety of tunnel shield. This paper used theory calculation and finite method to study the carrying capacity, distortion, loads distribution and anticipating life of the tunnel bear.The dimension of three-row roller bearing is large, the amount of roller is quite more, and there is several dozen to hundred of roller in each row. As for the bear that is in large dimension and has many rollers, its contact parts between ring and roller is so many, the contact status is complex, moreover, contact analysis is high nonlinearity analysis. It is difficult to use finite analysis.This paper analyzed force status of bearing's three rows roller under static load firstly, calculated load distribution of three rows roller under axial force, radial force and moment, obtained load, the largest contact stress and distortion values of each roller under loading, and made sure the position and values of the largest load roller.In order to ensure the calculation precision and minish resolve scope, this paper adopts ANSYS finite analysis software, analyzed stress and distortion of the whole bearing under axial, radial force and moment, according to the results that gained, then built finite model for the largest load roller of the first, second and third row, analyzed simulation result. The finite analysis results of load distribution trend, stress and distortion is closer to roller bearing theory calculation results. This research contributes to fatigue life and experimentation study of the bearing. |
