Knuckle mechanisms have large force gain. The working properties of strait link-knuckle and triangle link-knuckle mechanisms were analyzed and their mathematic models were built up herein. Taking 4000kN servo press as example, the numerical simulations were conducted. The simulation results show that the triangle link-knuckle mechanism has better kinetic-dynamic characteristics. In comparison with common strait link-knuckle mechanism, the required torque reduces by 70.6% and the average velocity of the slide within the nominal pressure stroke reduces by 50% with the same nominal pressures.

以增力较大的肘杆机构为对象,分析了普通直线连杆-等长肘杆和三角连杆-不等长肘杆两种机构的工作特性,建立了它们的动力学和运动学模型。以4000kN伺服压力机为例,采用MATLAB仿真软件对伺服机械压力机传动机构进行了运动学-动力学仿真分析。分析结果表明,三角连杆-不等长肘杆与直线连杆-等长肘杆相比具有更好的动力学和运动学特性：在同等公称压力条件下,三角连杆-不等长肘杆的输入扭矩较直线连杆-等长肘杆的输入扭矩小70.6%,而公称压力行程内前者的平均速度约为后者平均速度的50%。

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伺服压力机, 三角连杆, 动力学, 驱动扭矩

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