Abstract:Based on the distribution rule of gear machining and assembly errors, an error tooth surface model of involute spur gear was established, and a novel gear load contact analysis algorithm suitable for the presented error tooth surface model was proposed. The influence of different errors on the internal excitation of spur gear pair was investigated. On this basis, a bending-torsion coupling dynamic model of spur gear pair was established, and the dynamic characteristics of the gear system under different errors were analyzed. The results show that the pitch deviation is the main factor affecting the internal excitation of the spur gear pair among the machining errors. Under the action of the pitch deviation, the composite meshing error changes step by step, and the time-varying meshing stiffness changes suddenly when the step value exceeds a certain range. Under the influence of assembly errors, the composite meshing error is a certain value during the whole meshing cycle, and the time-varying meshing stiffness decreases with the increase of the center distance and the misalignment deviation of gear axis. To reduce the peak-to-peak value of the dynamic transmission error of the gear system, the pitch deviation should be reasonably distributed according to the load size, and the eccentric load on the tooth surface caused by the misalignment deviation of gear axis should be avoided.
Key words: spur gear pair; error tooth surface; internal excitation; dynamic characteristics
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