Synthesis and analysis of the five-link rear suspension system used in automobiles

The paper deals with the optimum kinematic synthesis and analysis of the five-link independent suspension system (also known as “multilink” suspension, mechanism commonly symbolized 5S–5S). The synthesis goal is fulfilling a minimum variation of the wheel track, toe angle and camber angle during jounce and rebound of the wheel. Two solutions obtained by synthesis are analyzed and compared to an existing solution, and the displacement, velocity and acceleration of the wheel carrier relative to the car body are determined, together with the variation of the momentary screw axis and the rear axle roll-center height. Both the kinematic synthesis and the analysis are performed in a simplified, easy to program manner, using a fictitious mechanism that has all the links dismounted from their joints.