差动式行星滚柱丝杠副的运动特性与动力学分析

Kinematics and Dynamic Characteristic Analysis of the Differential Planetary Roller Screw Mechanism

差动式行星滚柱丝杠副是一种将环槽传动与螺纹啮合相结合的机械传动机构。为了探究差动式行星滚柱丝杠副的动态特性,研究一种新型的差动式行星滚柱丝杠副的结构组成与运动原理,建立其三维模型,并将模型导入虚拟样机分析软件中,通过设置合适的连接关系,对三维模型进行运动学及动力学仿真分析。结果表明:虚拟样机中差动式行星滚柱丝杠副的运动过程与运动分析相符合,验证了运动分析的合理性;当在螺母上施加负载时,滚柱与螺母之间的环槽设计使接触力波动更规律;随着负载的持续增大,丝杠与滚柱之间、螺母与滚柱之间的接触力波动也持续增大,加剧了机构内部的磨损情况,缩短了机构的运行寿命。

Differential planetary roller screw mechanism is a kind of mechanical transmission mechanism with high reduction ratio,which combines ring groove drive with thread meshing.In order to explore the dynamic characteristics of differential planetary roller screw,the structure and motion principle of a novel differential planetary roller screw were studied.The 3D model of the differential planetary roller screw mechanism was established,and the model was imported into the virtual prototype analysis software.The appropriate connection relationship was set up,and the kinematics and dynamics analysis of the 3D model was carried out.The results show that the motion in the virtual prototype is consistent with the motion analysis,which verifies the rationality of the motion analysis.When the load is applied to the nut,the ring groove design between the roller and the nut makes the contact force fluctuation more regular;with the load continues to increase,the contact force fluctuation between the screw and the roller,the nut and the roller also continues to increase,which aggravates the wear inside the mechanism and shortens the operating life of the mechanism.