关键词: 五连杆悬架；机械原理；自由度；DMU 仿真；汽车底盘；机械运动分析；CATIA

Abstract: This article introduced the structure, mechanical motion principle, suspension motion modeling, and digital mock-up (DMU) model application of the automotive chassis five-link rear suspension. This article analyzed the mechanical motion principle of the automotive five-link rear suspension from a theoretical point of view, calculated the number of components, calculated the number of motion pairs, and calculated the degree of freedom of space. This article detailed the CATIA DMU kinematic modeling process, including input parameters, creating parts, creating constraints, and creating drive simulations. This article used the suspension DMU model to solve the practical problems of automotive chassis design, including checking the clearance of each moving part to prevent part collision interference. Make tire sports envelopes to support body styling. Output the wheel displacement and camber relationship diagram to determine whether the vehicle had excellent kinematic characteristics. Output wheel toe angle and camber adjustment range. Obtain the lever ratio of the movement of the wheel center, spring, and shock absorber, and calculate the load of the suspension part to support the suspension design. This article has a wide application value in the field of automotive design.

Key words: Five-link suspension; Mechanical principle; Degree of freedom; DMU simulation; Automotive chassis; Mechanical motion analysis; CATIA