The shock absorber is attached to the axle at the bottom and to the chassis at the top. It is a direct-acting, telescopic-type shock absorber.
The coil spring is mounted between the axle housing and the vehicle body.
In this example of the Watts Link suspension, the lower trailing arm assists in maintaining the longitudinal position of the housing.
In addition, the drive torque is transmitted through this arm to the vehicle body.
The axle housing is rigid between each road wheel. This means that any deflection to one side is transmitted to the other side. These control rods are the additional parts for the ‘Watts Link’. Their function is to assist in stabilizing the vehicle against lateral movements.
In other coil-spring rear suspension designs, this is achieved with an angled panhard rod.
The upper trailing arm provides the additional control for the longitudinal movement. These trailing arms are mounted in rubber bushes.