Research Of New-typed Auto-eliminate Backlash Mechanism For Gear

The new-typed auto-eliminate backlash mechanism is a patent developed by Professor Wang Jinge, It is used between two gears in exact mechanical drive, in order to eliminate instability ,low precision, poor reliability of the gear drive, which are derived from the backlash. Compared with the traditional eliminate backlash mechanism, the characteristic and the excellence of the new-typed auto-eliminate backlash mechanism are as the follows: The new-typed auto-eliminate backlash mechanism consists of spring, slider and pendulum, then the structure is simpleness. Slider has obliquity to ensure that the whole machinery remain in self locking, the adjustable scope of slider'obliquity is great, and it does not vary with location of slider, therefore, the self locking is good. Contacts between gear and slider, slider and pendulum, another gear and pendulum are by areas, then carrying capacity is high. The new-typed auto-eliminate backlash mechanism uses to not the parallel axial gear but the worm and gear, so the suitable scope is wide. According to these reasons, the new-typed auto-eliminate backlash mechanism is applied. At the present time, the research about the new-typed auto-eliminate backlash mechanism have been done to advance the principle, as a new-typed drive, the structure and the important parameters should be designed, the movement and the force should be studied, meanwhile, the static and the dynamic should be analysed.The research of this article is as follows:1 Based on the principle of the new-typed auto-eliminate backlash mechanism, the essential movement and force of the mechanism are analysed , which offers the condition to the design of the structure and finite element analysis.2 After the equations of the movement and the force are optimized by the optimize toolbox of MATLAB, the dimension parameters of slider and pendulum, which are the important component of the new-typed auto-eliminate backlash mechanism, are obtained. Based on the designed dimensions of slider and pendulum and the parameter of the coordinate gear, combining the mechanism design, the spring is designed.3 3D-model of the new-typed gear pair and the new-typed worm pair are established by Pro/E, the dynamic imitation is finished by the mechanic module of Pro/E, interference is validated, a point is chose on the combine area between slider and gear, slider and pendulum, another gear and the pendulum separately, the drawing of the displacements, velocities and accelerations of the three points are gotten.4 Auto-eliminate backlash mechanism and worm pair, established by Pro/E, are lead to ANSYS, then the analysis of contact stress of auto-eliminate backlash mechanism is finished and the stress distribution map is obtained ; the analysis of model of worm pair is finished and ten step frequencies and model patterns are gotten.