Reseach On Mechanic Performance Of Linear Motion Guide

Linear motion guide (LMG) is an important assembly in mechanical transmission. The thesis conducts studies on several primary mechanic performance of LMG and their impact factors.Firstly, a simple and effective FEA model is built without considering the distortion of slider and analyzed by the software ANSYS. the rolling ball's distortion and the static stiffness are obtained. The correction of model is confirmed by comparing data from LMG product specification. Further more, distortion of slider are considered in the proposed model for accuracy of stiffness evaluation.Secondly, author analyzes and syntheses factors of friction force in LMG. Friction force evaluation formulas for each factor are derived in detail. Specially, the oil film thickness under elastohydrodynamic lubrication, as key condition to analyze friction force, is carefully discussed and its evaluation formula is presented.Finally, based on the error averaging effect of LMG, a model for mode analysis is built and simulated by the software ANSYS. Its five modes are found. The rationalty of analysis result is illustrated by comparing with the product trial data.The achievement of the thesis will give meaningful theoretic guidance for further improvement of the mechanic function and for extension of application fields for LMG products.