Influence of Front Double Wishbone Independent Suspension Performance on Front Rubber Bushing Stiffness of Lower Control Arm

Abstract

Front double wishbone independent suspension is built according to hard point parameters of a car. After the rubber bushing stiffness of lower control arm is changed, the suspension performance is analyzed and discussed with multi-body dynamics and Suspension Kinematics theory. The conclusion can be drawn as follows: when wheels are hoping, all the stiffness of lower control arm have no effect on camber angle, caster angle and kingpin_incl_angle, and torsion stiffness of rubber bushing has heavy effect on toe angle, but axial, radial stiffness have no effect. While steering, all the stiffness of lower control arm rubber bushing have no effect on camber angle and toe angle, torsion stiffness has no affects on caster angle, axial stiffness has a little and radial stiffness has heavy, axial and torsion stiffness have none on kingpin_incl_angle, but radial stiffness has heavy. During the analyze of traction force and brake force, torsion stiffness of lower control arm rubber bushing has no effect on camber angle, kingpin_incl_angle and toe angle, axial stiffness has a little, and radial stiffness heavy. According to the curve of caster angle VS brake force, radial and axial stiffness of rubber bushing have a little affects on caster angle, but torsion stiffness none.