机械手表机心擒纵调速机构动力学仿真分析

Dynamics Simulation Analysis for the Escapement Mechanism of the Mechanical Watch Movement

作为机械手表机心的心脏,擒纵调速机构对走时精度有着至关重要的作用,而其运动过程却又十分复杂。鉴于此,基于连续碰撞力模型,建立了该机构的动力学模型,并用ADAMS对其进行了动力学仿真计算。结果表明,本模型能直观地预测在不同擒纵轮输入力矩条件下各零部件的动力学响应,从而计算出机械机心不同时刻的瞬时日差;能够在一定程度上预测机械机心瞬时日差随驱动力矩的变化趋势,且与试验值相比,模拟值具有良好的精度,为进一步改进国产机械手表机心的擒纵调速机构提供了有效的参考。

The escapement mechanism is considered to be the crucial component in a mechanical watch with a complicated motion. A dynamics model of the escapement mechanism is established based on the continuous impact force model,the dynamics simulation and calculation are carried out by using ADAMS. The results show that the dynamics response of each part under different input moment of escapement wheel can be directly predicted by the model,and therefore the corresponding instantaneous daily rate is calculated. Compared with the experimental data,the simulated results are able to predict the trend of the instantaneous daily rates in different driving torques in a moderate precision level. The model could be used to improve the performance of the escapement mechanism in the future.