
376 LIGHT AND HEAVY VEHICLE TECHNOLOGY
Figure 23.4 The effect of beam axle suspension of steering
properties: (a) arcs of movement not coincident, unwanted
steering effects (b) arcs coincide, good straight-running
properties
In order to preserve the Ackermann effect on heavy
vehicles with twin-steer axles, the drag link to the
second axle connects to the steering box drop arm at a
lesser radius of swing than the drag link connections to
the first axle, because the wheels on the second axle are
required to steer at reduced angles on turns. Owing to
installation length a two-piece drag link is used in
practice to connect the second axle to th ...