不对称齿距偏差人字齿轮大周期的三维振动特性分析

Here, to reveal effects of asymmetric tooth pitch deviation on transmission of herringbone gears, a large periodic load-bearing contact analysis method for asymmetric tooth pitch deviation herringbone gears was proposed to obtain comprehensive meshing stiffness, axial displacement, comprehensive meshing error and large periodic meshing impact forces of left and right helical gear pairs. The dynamic model of asymmetric pitch deviation herringbone gears was established, and dynamic responses of herringbone gear pairs under different loads and rotating speeds were compared. Effects of asymmetric meshing impacts on dynamic responses of left and right helical gear pairs were analyzed. The results showed that in 3 -D vibration displacement spectra of asymmetric tooth pitch deviation herringbone gears, shaft frequency component is most obvious, meshing frequency and its harmonics are relatively smaller; meshing frequency and its harmonics are more obvious in end-face vibration acceleration spectra, and a series of side frequency bands are distributed on both sides of meshing frequency and its harmonics, with increase in load, amplitudes of meshing frequency and its harmonics in 3-D vibration displacement and 3-D vibration acceleration spectra gradually increase, while amplitudes of side frequency band components gradually decrease; when rotating speed of small wheel exceeds resonance rotating speed, asymmetric meshing impact force gradually plays a dominant role in 3-D vibration acceleration changes of herringbone gear transmission system, meanwhile, the difference in 3-D vibration characteristics between left and right helical gear pairs is more obvious.