About Ackerman steering gear mechanism, it is much simpler than Davis gear mechanism but there are some differences like
- Entire mechanism is on the back of front wheel on the other hand in Davis, mechanism is in the front of front wheels
- Ackerman steering gear mechanism has turning pairs but Davis has sliding members
The whole mechanism of Ackerman steering gear consists of four bar crank chain ABCD in which two shorter links BC and AD are of equal length and AB and CD are of unequal length. Shorter links are connected by hinge joints.
In this mechanism when vehicle move in the straight direction, longer links moves in the parallel manner and shorter links inclined at some specific angle.
When driver takes a turn say left, the whole four bar mechanism moves in such a way that the lines of front wheel axle meets at instantaneous point I for correct steering and vice versa. In the end, we can say that Ackerman steering gear mechanism is the modification of Davis steering gear mechanism.