Ackerman Steering Mechanism and the Davis Steering Gear Mechanism
for any to given points within the solid, their distances remain constant
its center of mass has a null velocity
its total angular momentum remains constant
it rotates about a fixed axis
1) Ackerman Steering Mechanism:
Cars use the Ackermann steering principle. The idea behind the Ackermann steering is that the inner wheel (closer to ICR) should steer for a bigger angle than the outer wheel in order to allow the vehicle to rotate around the middle point between the rear wheel axis
Figure: 1.1 (Ackerman Mechanism)
Advantages of Ackerman Steering Mechanism:
The intention of Ackermann geometry is to avoid the need for tires to slip sideways when following the path around a curve. The geometrical solution to this is for all wheels to have their axles arranged as radii of circles with a common centre point.
Due to its turning pairs, it requires less effort to operate.
Ackermann acquires less wear and tear problems
Applications of Ackerman Steering Mechanism:
Following are the application of Ackerman steering mechanism
1) In Parallel Parking:
Due to smaller turning radius the park and un-parking of vehicle is easily performed to the right and left side.
2) High Speed Lane Changing:
In this is less steering sensitive this requires a lot of concentration from the drivers since he has to judge the space and vehicle behind them.
3) Narrow Road:
Due to rear wheel steering on the narrow road with its tight bends, counter phase steering reduces the turning radius
4) Slippery Road Surface:
Due to rear wheel steering operation on low friction surfaces occurs hence vehicle direction is easier to cont
