THE KINEMATIC OPTIMIZATION OF THE MULTI-LINK SUSPENSIONMECHANISMS USED FOR THE REAR AXLE OF THE MOTOR VEHICLES

摘要

In relative motion to the car body, the rear axle of the motor vehicles (usually, for the off-road and thecommercial vehicles) is guided by spatial mechanisms, on which between axle and chassis a numberof binary links or kinematics chains are interposed (multi-link mechanisms). From kinematic point ofview, the suspension mechanisms of the rear axles have to assure the main motions of the axle,namely the vertical displacement and the roll rotation, with minimum values for the other spatialmotions (the transversal & longitudinal displacements, and the yaw & pitch rotations). In this paper,an analytical method for the kinematic optimization of the multi-link mechanisms used for theguidance of the rear wheel is presented. According to the proposed method, the coordinates of theguiding points on axle are established by constructive criteria. Considering the geometric constraints,for imposed positions of the rear axle, the global coordinates of the joints on car body are determined.