内悬置电动轮的柔性联轴器动力学性能分析  

Dynamic analysis of flexible coupling for an electric wheel with a suspended drive motor

作　　者：罗荣康 俞志豪 吴佩宝 侯之超[1] LUO Rongkang;YU Zhihao;WU Peibao;HOU Zhichao(School of Vehicle and Mobility,Tsinghua University,Beijing 100084,China)

机构地区：[1]清华大学车辆与运载学院,北京100084

出　　处：《清华大学学报（自然科学版）》2024年第1期25-32,共8页Journal of Tsinghua University(Science and Technology)

摘　　要：内悬置电动轮构型可延长电机使用寿命,缓解簧下质量过大造成的舒适性问题。由于轮内空间有限,用于动力传递的柔性联轴器结构和性能直接决定内悬置电动轮的性能。该文提出了一种面向内悬置电动轮的柔性联轴器。该联轴器是由多个连接臂组成的平面并联机构,每个连接臂由2个平行四边形机构串联而成。建立了该联轴器机构的运动学和动力学模型,给出了偏心度、连杆静载荷及动载荷的计算方法。结合一组结构参数,对联轴器的偏心度、连杆静载荷及动载荷进行了定量分析。结果表明:该联轴器允许传动系统在动力传动过程中沿垂向跳动,具有等速传动、占用轴向空间小、偏心行程大以及动载荷小等特点。该联轴器可望推进内悬置电动轮的工程化研发。[Objective]Compared with the commercially available centralized motor drive systems,in-wheel drive motors are installed inside the wheels and provide high transmission efficiency,enhanced control flexibility,and ease of modular vehicle design.In mainstream configurations of in-wheel drive motors,the power and transmission devices are rigidly connected to the chassis,thereby increasing the unsprung mass of the vehicle and the rotational inertia of the wheels.This increase in unsprung mass and rotational inertia results in higher vertical acceleration of the vehicle body and increased dynamic loads on the wheels.Moreover,due to the lack of buffering effect from the centralized driving vehicle's half shaft,the rotational vibration of the wheels and the longitudinal vibration of the vehicle are more prominent.Electric wheels with suspended drive motors can not only extend motor life but also alleviate comfort problems as a result of excessive unsprung mass.Designing flexible coupling within limited wheel space in an electric wheel is a critical challenge.[Methods]In this paper,a flexible coupling was proposed for an electric wheel with a suspended drive motor.The coupling was a planar parallel mechanism composed of several connecting arms,each of which consisted of two parallelogram mechanisms linked in series.As only the rotational joints existed and the stiffness of the input and output disks were high,the analysis assumed that the connecting rod only experienced axial deformation and the input and output disks were treated as rigid bodies.Under these assumptions,kinematic and dynamic models were established for the coupling utilizing the geometric relationships between the rods with the principles of mechanical equilibrium.Coupling eccentricity and the static and dynamic loads of the components were then derived.To demonstrate,a set of parameters were selected for the coupling,and numerical calculations were performed for the eccentricity,static load,and dynamic load of the coupling.[Results]The results show that

关 键 词：电动轮 电机悬置 柔性联轴器 平面并联机构 动力学分析 

分 类 号：TH132.3[机械工程—机械制造及自动化]