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K. Lohith1, Dr. S. R. Shankapal2, M. H. Monish Gowda3 1- M. Sc. [Engg.] Student, 2-President, 3- Assistant professor Automotive and Aeronautical Engineering Department, M. S. Ramaiah School of Advanced Studies, Bangalore – 58.

Production cars are designed to understeer and rarely do they oversteer. If a car could automatically compensate for an understeer/oversteer problem, the driver would enjoy nearly neutral steering under varying operating conditions. Four-wheel steering is a serious effort on the part of automotive design engineers to provide near-neutral steering. Also in situations like low speed cornering, vehicle parking and driving in city conditions with heavy traffic in tight spaces, driving would be very difficult due to vehicle’s larger wheelbase and track width. Hence there is a requirement of a mechanism which result in less turning radius and it can be achieved by implementing four wheel steering mechanism instead of regular two wheel steering. In this project Maruti Suzuki 800 is considered as a benchmark vehicle. The main aim of this project is to turn the rear wheels out of phase to the front wheels. In order to achieve this, a mechanism which consists of two bevel gears and intermediate shaft which transmit 100% torque as well turns rear wheels in out of phase was developed. The mechanism was modelled using CATIA and the motion simulation was done using ADAMS. A physical prototype was realised. The prototype was tested for its cornering ability through constant radius test and was found 50% reduction in turning radius and the vehicle was operated at low speed of 10 kmph. Nomenclature L R a2 δif δof δir δif R1 Wf W C1 C2 wf wr δ δi δo Wheelbase (mm) Turning radius (mm) Distance of CG from rear axle (mm) Inner angle of front tire (degree) Outer angle of front tire (degree) Inner angle of rear tire (degree) Outer angle of rear tire (degree) Distance between instantaneous centre...
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