Research on the existence of boron nitride existence in grease and how it influences the motion resistance of the stud of steering rod
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The design of the steering rod pin for research vehicles has been presented in the article. The aim of described research has been the estimation of values for the coefficient of friction between sphere surfaces of the stud and of its seat, for two cases of grease. A road test has been carried out to estimate the number of relative displacements of the surfaces of the pin and its seat, in the measuring length. The model of the pin - seat assembly has been elaborated using a finite elements method. The unit loading on the pin surface has been calculated in the model. Additionally, the scheme of the research stand for the measurement of friction moment, between mating spherical surfaces of pin and its seat, in reversing motion conditions has been presented. Research on friction moment values between surfaces of the pin and its seat have been made in the stand, for the case of pure lithium grease existence and for the case of lithium grease with the boron nitride additive. Based on calculated unit pressure loading the spherical surface of the pin and on values of measured friction moment, values of friction coefficient between mating surface of the pin and its seat have been estimated. It has been noted a nonlinear dependence of the friction coefficient against the slip speed and hysteresis phenomena.
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