Study To Design Of Larger Bearing Of The Shield Machine

With the rapid development of urban underground track construction, as a special tunnel construction equipment, shield machine is widely used. The drive bearing is one of the key components of shield machine, which relies on import currently and the domestic research is still in its primary stage. The studies of design theory and methods on 3-row roller bearing are as following:This article concludes the traditional bearing design theory and modern bearing design method. Through comparison between traditional design method and modern design method, it is concluded that the use of modern design method in bearing design is necessary. Especially, for large-scale bearing used in specific conditions such as large bearing of shield machine, as no standard could be referred in its structural parameter, traditional design theory of bearing life shall be effectively combined with modern optimized method in design process.By shield cutting wheel drive system structure and working principle, the detailed analysis of driving force has been made by the study target of 3-row roller bearing which is widely used in foreign shield. The parameter optimization model is established by the combination of bearing's force characteristics of shield and design method. Chengdu metro is as the case of solving the optimization problem by MATLAB. The result shows that the method can be effectively define the number and size of the bearing which has positive influence on the study of domestic production of bearings.The comparison of the result of the contact stress analysis of the roller and raceway contact area by ANSYS and the calculated result by traditional Hertz theory verifies the feasibility of 3-row roller bearing contract stress calculation by ANSYSY software, In order to improve bearing's service life, an amendment method of roller is introduced and the best degree of convexity is defined by repeated simulation which makes the edge stress has been effectively improved.