Ackermann's Steering principle

Ackermann's Steering Principle

“It’s only after you’ve stepped outside your comfort zone that you begin to change, grow, and transform.”
― Roy T. Bennett 

 

The most basic predominant feature in our vehicles is steering system which is used to control the vehicle while turning it in required directions without losing stability . The steering system which is working under the principle called Ackermann steering geometry . In 1818 , this geometry was patented by Rudolph Ackermann which was discovered by Lankensperger from Germany . It will help the vehicle to overcome the scrubbing and slipping of the wheels while cornering .

 

For better understanding consider a wheel is in moving condition , while moving two motions are generated one is translational motion and other is rotational motion . These both motions should be equal in magnitude and opposite in direction to overcome slipping and scrubbing even in turning conditions .

General construction is two stub axles are provided at the each corner of the front axle to make the wheels to tilt . Track arm is connected between stub axle and track rod . Track rod links steering unit with arm . The axes of these stub axles with front wheels will intersect at a common point or center when turn around . This common center would lie somewhere along rear axle with its extension , because the rear wheel axis is fixed . 

Lets assume , the angle through which the inner wheel turns would be greater than the angle through the outer wheel turns . In most passenger cars , the ratio is between 12:1 and 20:1 . If one complete turn of the steering wheel is 360 degrees then it causes the inner wheel to turn 24 degrees . Thus the ratio is 360:24 .

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