Davis Steering Mechanism
Davis steering gear is shown in Fig. This type of gear has only sliding pairs. Two arms AG and BH are fixed to the stub axles AC and BD respectively. CAG and DBH form two similar bell – crank levers pivoted at A and B respectively. KL is a cross-link which is constrained to slide parallel to AB. The ends of the cross-link KL are pin-jointed to two sliders S1 and S2 as shown in Fig. These sliders are free to slide on links AG and BH respectively. The whole mechanism is in front of the front wheels.
During the straight motion of the vehicle, the gear is in the mid-position, with equal inclination of the arms AG and BH with the verticals at A and B. The steering is achieved by moving cross-link KL to the right or left of the mid-position. The steering gear for taking a right turn is shown in Fig. (below). K′L′ shows the position of the cross link KL while taking a right turn.
Determination of angle α
Let,
x = distance moved by KL from mid position
= KK′ = LL′
y = horizontal distance of points K and L from
A and B respectively
h = vertical distance between AB and KL
α = angle of inclination of track arms AG and BH with
the vertical in mid position
θ, φ = angle turned by stub axles from above figure, we have
y = AK sin α = BL sin α
Generally, b/l = 0.4 to 0.5, so that of α = 11.3° to 14.1°. There will be friction and more wear due to sliding pairs in the Davis steering gear. It fulfills the fundamental equation of gearing in all the positions. However, due to easy wearing, it becomes inaccurate after some time.
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