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Ackermann Steering (SMT-TM-36)
Investigate a steering trapezoid.
Investigate the steering geometry according
Adjustment of the track rod lengths.
Read the steering angle on the scales.
Adjustment of the zero position of the
steering angle by locking the mechanism.
Adjustment of the steering angle of the
Measure the steering angle of the outside
Base plate with handles suitable as benchtop
model and for wall mounting.
When it comes to steering, the entire vehicle’s wheel should be exactly on a circular path. To
achieve this, the extensions of all the axles must intersect at the centre of the circle
(Ackermann’s steering principle). This requires that the wheel inside of the curve drives more
than the wheel outside of the circle. This is approximately achieved with a steering trapezoid,
comprising an axle, a track rod and two track-rod arms on the wheels. The SMT-TM-36 unit
can be used to study a steering trapezoid. The experimental unit comprises two track rods
with drag link, two track-rod arms and two steering pins, where, in theory, the wheels are
attached. The length of the axis corresponds to the distance between the steering pins. The
lengths of the two track rods are independently adjustable. To set the zero position of the
steering angle, the mechanism is fixed via a lock on the drag link. The steering angle on the
inside wheel is set; the angle of the outside wheel changes according to the geometry and is
read. The difference between the two angles is the lead angle or relative steering angle. The
difference between the calculated and measured steering angles is the steering error.
Disadvantages of an incorrectly set track rod can be demonstrated. The elements are
mounted on a base plate, which can also be mounted on a wall.