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Abstract
In a transmission system, the cooperative utilization of metal small gears and plastic large gears not only significantly reduced the system weight and noise levels, but also harmonized strength and longevity between the gears of varying sizes. Nevertheless, the existing research on metal-plastic friction remains insufficient. This study focused on the ADC12-POM gear pair, conducted sliding friction tests between polyoxymethylene (POM) plastic balls of different diameters and ADC12 metal plates using a self-made reciprocating friction and wear testing machine. The friction coefficients between the ADC12-POM sliding pairs were evaluated under different load and velocity conditions, and subsequent nonlinear regression analysis using the IBM SPSS software yielded an initial calculation model for the friction coefficients at the contact surfaces of the ADC12-POM gear pair.
By analyzing the Engagement characteristics of gears, we calculated the variations in curvature radius, relative sliding velocity, and load distribution coefficient during the Engagement process. This enabled us to establish a computational model for determining the tooth surface friction coefficient of the ADC12-POM gear pair. Furthermore, we derived the relationship between Engagement efficiency and the friction coefficient and conducted experimental investigations to assess the efficiency of gear Engagement. The deviation between the theoretically calculated Engagement efficiency and the experimental results was approximately 2%, thereby confirming the feasibility of the friction coefficient calculation model.