Due to the influence of various factors in the planar linkage mechanism, clearances will occur at the kinematic pair unavoidably. The existence of clearances will reduce the kinematic accuracy of mechanisms and have a great influence on reliability of mechanisms. At present, most of researches focus on static reliability of mechanisms or dynamic accuracy reliability of simple mechanisms with a single clearance, while the research on dynamic accuracy reliability of complex multi-link mechanism with several clearances is less. In this paper, a novel modeling and calculation method for dynamic accuracy reliability of complex multi-link mechanism with revolute clearances is proposed, and the impact of different factors on dynamic accuracy reliability of mechanism is researched. Taking 2-DOF 7-bar linkage mechanism as an example, a dynamic model with revolute clearances is derived, and the dynamic accuracy reliability model of mechanism is developed based on stress-strength interference theory. The impact of driving speed, clearance values and friction coefficient at the clearance on dynamic accuracy reliability of mechanism in different variation ranges is studied. The research can not only provide evidence for reliability design of the follow-up mechanism, but also has a reference significance for research on reliability of other mechanisms.

由于平面连杆机构中各种因素的影响，运动副处不可避免地会出现间隙。间隙的存在会降低机构的运动精度，对机构的可靠性有很大影响。目前，研究多集中在机构的静态可靠性或单一间隙的简单机构的动态精度可靠性上，而对多间隙复杂多连杆机构的动态精度可靠性的研究较少。本文提出了一种新的具有旋转间隙的复杂多连杆机构动态精度可靠性建模与计算方法，并研究了不同因素对机构动态精度可靠性的影响。以2-DOF 7连杆机构为例，推导了带旋转间隙的动力学模型，并基于应力-强度干涉理论建立了机构的动态精度可靠性模型。行驶速度、间隙值和研究了间隙处的摩擦系数对不同变化范围内机构动态精度可靠性的影响。该研究不仅可以为随动机构的可靠性设计提供依据，而且对其他机构的可靠性研究也具有参考意义。