A vehicle height control system includes an arm including a first end portion connected to a vehicle body and a second end portion coupled to a wheel, a bearing unit fixed to the vehicle body, a crank coupled to the bearing unit, a push rod including a first end portion connected to the crank and a second end portion connected to the arm, and a spring reaction force variable device coupled to the bearing unit and configured to vary reaction force applied to the crank.

An electrified vehicle, comprising a chassis having a frame, a first tractive element, and a first suspension system coupled with the first tractive element and the chassis. The first suspension system may comprise a first knuckle coupled with the first tractive element, and a first strut-damper coupled with the first knuckle and the chassis, the first strut-damper extending between the chassis and the first knuckle. The first suspension system may also include a first control arm coupled with the first knuckle and the frame member, and a torsion bar coupled with the chassis at a first end of the torsion bar. The torsion bar may extend in a direction substantially parallel with the frame member, where the torsion bar may be configured to support a portion of a mass of the electrified vehicle in response to displacement of the first tractive element relative to the chassis.

An embodiment suspension system for a vehicle includes a rocker arm housing coupled to a first end of a 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 rotatable 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 along the rotation axis and then coupled to a vehicle body connection member, and a contact protrusion disposed on either the rocker arm housing or the rocker arm, the contact protrusion being configured to come into contact with the other of the rocker arm and the rocker arm housing in accordance with a rotation angle of the rocker arm housing.

An embodiment suspension system for a vehicle includes a rocker arm housing coupled to a first end of a 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 rotatable 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 along the rotation axis and then coupled to a vehicle body connection member, and a contact protrusion disposed on either the rocker arm housing or the rocker arm, the contact protrusion being configured to come into contact with the other of the rocker arm and the rocker arm housing in accordance with a rotation angle of the rocker arm housing.

A torsion bar for a vehicle steering system includes a first end region. The torsion bar also includes a second end region. The torsion bar further includes a main body extending about a longitudinal axis of the torsion bar from the first end region to the second end region, wherein the main body defines a plurality of splines circumferentially spaced from each other to form a splined outer surface extending along the entire length of the main body.