关键词: 车辆工程, 怠速爬行异响, 扭转减振特性, 大转角, 异阻尼

Abstract: In the creeping case of vehicle with clutch of manual gearbox, torsion damper is not able to reduce the vibration, due to the configuration of the clutch itself, consequently, which may affect the NVH of vehicle and lead to the abnormal noise. With regard of some domestic diesel SUV, the mechanism of creeping noise was analyzed. Optimization of the torsional vibration characteristics’ curve was carried out by use of adjusting the torsional stiffness of torsion damper, the friction damping, pre-tension torque, stiffness series, etc. In the meantime, vehicle trial was performed to measure the variation of torsional vibration with torsional vibration analyzer and the subjective evaluation of creeping noise was conducted with magnitude estimation. Finally, the strategy of a large turn-angle, variable damping and three-level clutch was acquired to radically solve the problem of creeping noise. The improved method and new configuration proposed is also appropriate to any vehicle with a torsion damper clutch.

Key words: vehicle engineering, creeping noise, torsional vibration characteristics, large turn-angle, variable damping