两侧不对称单曲柄-双摇杆机构的同步性研究

Research on synchronization of bilateral asymmetric single crank double rocker mechanism

针对传统不对称单曲柄双摇杆机构中两侧摇杆存在相位角差而造成机构运动不平衡的问题,文中对曲柄中存在夹角的不对称单曲柄双摇杆机构进行研究,系统分析其在提高两侧摇杆同步性方面的优势。首先建立不对称单曲柄双摇杆机构的简化模型,基于平面连杆机构基本方程对摇杆同步性进行最优求解,得出极限偏差角最小情况下各杆长的经验公式,并对公式中影响极限偏差角的参数进行了分析。结合工程实际,将不对称曲柄双摇杆机构中曲柄存在夹角和不存在夹角的两种情况进行对比,结果显示,在满足相同杆长条件下,曲柄中存在夹角的机构相比曲柄中不存在夹角的机构在减少左右摇杆相位差角方面更有优势,能提高不对称机构的同步性。

Aiming at imbalance motion of traditional bilateral asymmetric single crank double rocker mechanism（BASCDRM） that caused by phase difference, a BASCDRM with an existed angle in the crank is researched, and its advantages in improving the synchronization of bilateral rockers were systematically analyzed. Firstly, a simplified model of BASCDRM is established. Then, based on the fundamental equations of planar linkage mechanism, the optimal solution of rocker synchronization was obtained, and empirical formula of rockers length was obtained by minimizing extreme deviation angle. At the same time, effects of empirical formula parameters on limit deviation angle were discussed. Considering engineering practice, a comparison was worked out between two kinds of BASCDRMs, results show that a BASCDRM with an existed angle in the crank is superior to a BASCDRM without angle in the crank in reducing phase difference in bilateral rockers, and the synchronism of asymmetric mechanism can be improved.