Abstract:

Based on bi-spring-blade concept,a novel flexible connection mechnism was put forward with detailed analyses of degree-of-
freedom(DOF) and stiffness.Taking advantage of the nature of thin spring blade characterized by perfect out-plane flexibility and in-plane stiffness,the flexible connection
realized direction-independent stiffnesses and allowed the connected body to have 3 DOFs without backlash and hysteresis.The connection is especially well suited for the connected body that is to vary poses or vibrate/sway during operation.Also,it is to be used to eliminate relative rotation of
two bodies with allowed relative precision movements or to be used as coupling mechnism to sychronize rotation of two shafts.The successful application of the novel connection mechanism to precision movements of an optical mirror system introduced an significant stiffness increment,from 3Hz to 9Hz,of the rotary eigenfrequency,meanwhile,
it realizes backlash-free and hysteresis-free motion with 3DOFs at resolution of
10nm class required by the movements of the mirror system.

Key words: mechanism design;flexible connection;stiffness;precision mechanism;degree-of-freedom

摘要：

提出了一种新型的基于双簧片机构的弹性连接装置，并进行了结构、自由度和相关刚度的详细分析讨论。利用薄簧片具有良好的面外弹性（柔性）及良好的面内刚度，设计了无回程间隙的弹性连接机构，允许被连接物有3个自由度的运动,且刚度与方位无关。该机构尤其适用于姿态需要变化和作弹性振动或摆动零部件的支撑连接，也可以用于限制作相对精密运动的两物体之间的相对转动或用于传递两物体之间轴向转动的联轴节装置。在实际光学镜面精密微调系统中的应用表明,该弹性连接机构有效地提高了镜面系统转动模式的对应固有频率（由3Hz提高到9Hz），同时满足镜面调节运动的10nm级运动分辨率无间隙无迟滞的技术要求。

关键词: 机构设计；弹性连接；刚度；精密机械；自由度