Davis Steering Gear Mechanism

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The Davis steering gear mechanism consists of a cross-link KL sliding parallel to another link AB. It is connected to the stub axles of the two front wheels using two similar bell crank levers ACK and DBK pivoted at A and B respectively.

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The cross-link KL slides in the bearing and carries pins at its end K and L. The slide blocks are pivoted on these pins and move with the turning of bell crank levers as the steering wheel is operated. When the vehicle runs straight, the gear is said to be in its mid position. The sort arms AK and BL inclined an angle 90 + a to their stub axles AC and BD respectively. The correct steering depends upon the suitable selection of cross-arm single a and is given by

tan α =b/21

b= AB = distance between the pivots of front axles,

l= wheelbase.

The range of b/1 is 0.4 to 0.5, hence angle lies between 11.3 and 14.1°