Active geometry control suspension system of vehicle

An active geometry control suspension system of a vehicle, comprising:

• a toe control mechanism which is configured between a wheel carrier and a sub-frame at a rear wheel side, and actively controls a posture of a vehicle body,
• wherein the toe control mechanism includes:
• an assist link disposed between the wheel carrier and the sub-frame;
• a housing unit integrally formed with the sub-frame and having hinge brackets integrally formed on both sides of a wheel side one surface;
• a guide unit configured to guide a vehicle body side connection portion of the assist link along a predetermined trajectory through cam guiders which slide upward and downward along guide rails disposed on both side surfaces of the housing unit;
• a drive unit configured to engage an actuator which is installed at one side of the housing unit and a screw shaft disposed at one side of an inner portion of the housing unit by a coupler, and transmit rotating driving torque;
• and
• a power transmission unit configured to convert the rotating driving torque of the screw shaft into linear motion and transmit the linear motion to the vehicle body side connection portion of the assist link so that the vehicle body side connection portion of the assist link is raised and lowered along the predetermined trajectory of the guide unit by the rotating driving torque of the screw shaft,
• wherein the power transmission unit includes:
• a slider having a screw hole formed in a vertical direction so as to be screw-coupled to the screw shaft of the drive unit;
• a pair of guide rods disposed at left and right sides and configured to pass through the slider upward and downward at both sides of the screw shaft such that an upper end and a lower end of the guide rods are fixed to upper and lower support members, and to guide the slider without moving the slider;
• and
• a pair of lever arms disposed at left and right sides and disposed at both sides of the vehicle body side connection portion of the assist link such that a wheel side end portion thereof is hingedly connected to the hinge brackets b a hinge pin, and a vehicle body side end portion thereof is connected to both sides of the slider,
• wherein the slider and the lever arms form fork pins on both side surfaces of the slider, and forks on the vehicle body side end portion of the lever arms such that the fork pins and the forks are connected to each other, and bushings are interposed between the fork pins and the forks,
• wherein the bushings have a quadrangular shaped contact portion where the bushings come into contact with the forks, and
• wherein in the contact portion with the forks, an outer surface of the bushings is formed in waveform.