THE EQUATION DERIVATION AND ANALYSIS OF MESHING EFFICIENCY FOR A STRAIGHT SPUR GEAR PAIR

According to the concept of "Stribeck Curve" proposed by Downson, this paper proposes modified coefficients for the calculation of average friction coefficients for approach and recess. Based on the research of. Buckingham, this paper derives the theoretical meshing efficiency equation of straight spur gear pair. And, based on the involute theorem, the average sliding velocities for approach and recess are obtained. The corresponding modified average friction coefficients for approach and recess are obtained. Finally, according to modified average friction coefficients and meshing efficiency equation, the meshing efficiencies for straight spur gear pair (15,79) are analyzed to be 99.04-99.62%. The best meshing efficiency occurs at pinion speed 800-1500 rpm. Based on the proposed approach, the meshing efficiencies of all spur gear pairs can be analyzed. The results of this paper will contribute to engineers in the design of straight spur gear reducers.