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# Zero Turning Radius via Four Wheel Steering

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## Meghal Dave

on 1 May 2014

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#### Transcript of Zero Turning Radius via Four Wheel Steering

Amity University Rajasthan,
Jaipur
Submitted By :-
Meghal Dave
Mayank Agarwal

Zero Turning Radius via Four Wheel Steering System

Final Year Project Presentation-2014
Montek Singh Soni
Description:
Our topic is zero turning radius via four wheel steering system. In this, we are designing a setup in which vehicle can actually rotate on its place requiring the minimum possible space to change its direction.
We have designed a prototype of a car in which all four wheels turn in their separate direction (toe in and toe out). These wheels turning movements are controlled by separate arrangements and centripetal force helps in rotation of the vehicle.
Overview
Project description
Objective
Project methodology
Specifications of vehicle
Higlights and Video
Progress chart
Conclusion
Guided By:-
Dr. Ashish Malik
(Asst. Professor,ASET)
Project Description
Objective :

To achieve Zero turning radius in the model of car using arrangement of four wheel steering system.
Our main motive is to generate zero turning radius in the vehicle so that vehicle can actually rotate on its place. It means that the total length of the vehicle will become the turning radius for the vehicle and thus we will achieve our aim.

Brief Description :
Production cars are designed to understeer and rarely do they over steer. If a car could automatically compensate for an understeer/over steer 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 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.
Procedure / Methodology:
There are two running modes involved.

In first mode, front wheels are normally controlled via steering wheels and rear wheels remain straight without facing any toe in or toe out. In this mode, car runs and turns normally .
In second mode, both front wheels toe in and both rear wheels toe out. Each wheel has equal turning radius. In this mode, car rotates on its own place.
Technical Specifications of the vehicle
Type -2 Stroke, Air Cooled, Single Cylinder
Displacement - 71.5 cc
Max. Power @ 5500 rpm - 4.2 Hp
Max. Torque @ 4000 rpm - 5.7 Nm
Compression Ratio - 9 : 1
Battery - 12 V - 5 AH
Fuel Tank Capacity – 1.5ltr
Engine Performance:
Bore : 51mm
Stroke : 43mm
Tyre size : 3.0” * 10”
Length of the vehicle : 1540mm
Width : 960mm
Ground clearance: 160mm
Frame type : Square pipes
Frame material : Cast iron with primer coating
Weight : 112kg
Gears : Automatic
Emission norms : Euro2
Fuel Tank Capacity : 1.5 ltr
Measures & Dimensions :
The engine power is directed to rear right wheel and rest three wheels move according to this wheel.
Front tyres are made to toe in via steering and internal threading of pipe of steering system.
Rear wheels are made to toe out via vertical jack placed between the rear wheels and connected to both the hubs of rims via rod on both of its side.
When jack is made to extend, the tyres are in normal parallel mode but when it is shrinked , tyres come in toe out position.
The centripetal force created by the rear right wheel, rotates all the remaining wheels accordingly and so the vehicle rotates on its place.

Turning Mechanism:
The desired tyres position for Zero turning radius
(i.e. to rotate on its own place)

Final inspection of Screws& Nuts
Coating with Sandpaper
Testing of Prototype
Modifications for Turning Mechanism
Setting of various connections &
Brakes
Engine Overhauling &
Mounting
Fitting of Tyres &
Steering Assembly

Framing the model
Fabrication started
Items collected
Execution of plans