Suspension system for vehicle

A vehicle comprising:

• a vehicle body;
• a lower arm having an A-shaped external shape with three ends, wherein a first end is connected to the vehicle body, a second end is connected to the vehicle body, and a third end is coupled to a wheel of the vehicle;
• a rocker arm housing coupled to the first end of the lower arm through which a rotation axis passes;
• a rocker arm having a first end surrounded by the rocker arm housing and a second end disposed toward a center of the rocker arm housing, the rocker arm being configured to rotate together with the lower arm about the rotation axis;
• a torsion bar having a first end connected to the second end of the rocker arm and a second end extending alongside the rotation axis and then coupled to a vehicle body connection member, the torsion bar being configured to exhibit a torsional force by receiving a rotation of the lower arm through the rocker arm housing and the rocker arm;
• and
• a contact protrusion disposed on the rocker arm housing, the contact protrusion being configured to come into contact with a portion of the rocker arm in accordance with a rotation angle of the rocker arm housing.