Research On The Control Technology Of Starting Torque Of Aviation Self-lubricating Spherical Plain Bearings Installation

Aerospace self-lubricating spherical plain bearings(hereinafter referred to as SSPBs)have been widely used in aircraft manufacture fields.The starting torque of the bearing is one of the important indicators that affects the swing flexibility and transmission efficiency of the SSPBs,which is related to the safety and service life of the aircraft.There are strict requirements for the starting torque of the SSPBs after installation(mounting and staking)in aircraft manufacturing;therefore,one of the key technologies in the application of SSPBs is that the starting torque of the bearing is reasonably controlled.This paper mainly focuses on the mathematical model of the starting torque of the SSPBs,the fit between the bearing and the housing hole,the staking process of the bearing and the starting torque detection,and reveals the change and the principle of control technology of the starting torque of the SSPBs during installation process.The main research work of this paper is as follows:The formation mechanism of the starting torque of the SSPBs is analyzed,the critical load for the separation of the liner inside the bearing and the outer surface of the inner ring of the bearing is determined,and a mathematical model of the starting torque of the bearing is established.The accuracy of the established mathematical model is verified by experiments,and the model precision is also analyzed by the deterministic coefficients.The influence of the structural parameters of the bearing and the material performance parameters of the self-lubricating liner on the starting torque of the bearing is quantitatively studied,which laid the foundation for the subsequent study of the starting torque of the bearing.The concept of equivalent interference is proposed,and the effect of the fit relationship between the bearing and the housing hole on the starting torque of the bearing is studied by using this concept.A finite element numerical simulation model of the fit between the bearing and the housing hole is constructed,and the influence of the ovality and the surface roughness of the housing hole on the starting torque of the bearing is studied,and these laws are verified by press-fit tests of the SSPBs.These works will be instructive for determining the dimensional tolerance,shape tolerance and surface roughnessof the housing hole in engineering applications.The deformation of the V-groove of the outer ring of the bearing during the staking process is summarized into five basic states,and the optimal deformation state that meets the requirements of starting torque control is analyzed,and the effect of the different roller staking process parameters on the starting torque of the bearing are studied.In order to solve the problem that the starting torque of the bearing changes greatly after the roller staking process,a roller staking tool with an inner tapered rollers is designed.Based on the orthogonal experimental design and numerical simulation method,the influence of the staking load,feeding displacement,rotation speed of the roller tool and feeding speed on the quality of the roller staking process are studied,and the best of process parameters combination is obtained.A static detection method and data processing method for comprehensive evaluating the starting torque of the SSPBs are proposed.A dynamic simulation model of the swing system of the high frequency swing friction and wear testing machine for the SSPBs is constructed,and the influence of the inertia moment of the swing system on the online dynamic detection accuracy of the starting torque is revealed.The online dynamic detection error compensation program of the starting torque of the bearing is written,Error compensation for the dynamic detection of the starting torque of the bearing is realized.The research of this paper provides a theoretical reference for the rational control of the starting torque of the SSPBs during the design and the use of the bearing,and has important engineering and technical value.