Overview of Vehicle Chassis System:
General construction of chassis, Types of chassis layouts with respect tolocation of Power plant and drive arrangements and their comparison.Stability of vehicle on slope, weight distribution, numerical on above topics.
Frames:
Types of frames, loads acting of frame, cross sections and materials for frames,loading points, sub frames, calculation of cross section of frame members,Testing of frames numerical on above topics
Front axle and Steering Systems:
Front axle:
Types of front axles and stub axles, Axle parts and materials, loads and stresses, Front wheel geometry- calculation of cross sections of front axles. Steering Systems: Condition for correct steering, types of steering gears, power steering, Types of linkages, Ackermann and Davis steering mechanisms, Reversible and Irreversible steering.
Suspension System:
Types of suspension system Constructional details of leaf spring, helper springs, coil springs, torsion bar, rubber springs, plastic springs, air bellows or pneumatic suspension, hydraulic suspension, constructional details of telescopic shock absorbers, independent suspension, front wheel independent suspension, rear wheel independent suspension, types, stabilizer, trouble shooting
Brakes:
Necessity and requirements of brakes, stopping distance and time, brake efficiency, weight transfer, brake shoe theory, determination of braking torque, Classification of brakes, constructional details- Drum brakes, Disc brakes Hydraulic brake system, Pneumatic brakes, Power assisted Braking system, Servo Brakes, Anti-lock Braking system, Retarders, Hill Holders, requirements of brake fluids, requirements and construction of brake shoes, trouble shooting.
Rear Axles:
Construction of rear axles, Types of loads acting on rear axle, Full floating, Three Quarter Floating and Semi – floating axles, Hotchkiss and torque tube drive
Overview of Vehicle Power Trains System:
Outlines of Power Trains, Power train functions, Power train layout and components, Main and Auxiliary functions, Requirements profile, Interrelations: Direction of rotation, Transmission Ratio and Torque, Road Profiles, Load Profiles, Typical Vehicle uses and Driver types, Performance features of Vehicle Transmissions. Design trends in Transmission, Kinematical relations of power trains, Numerical problems.
Matching Engine and Transmission:
Road loads and axle loads, Deriving condition diagram, Ideal transmission and engine-transmissions matching, Total ratio and overall gear ratio Selecting the largest power- train ratio, Selecting the smallest power- train ratio, Selecting the intermediate gears- saw tooth profile, Geometrical gear steps, Progressive gear steps, Numerical problems.
Manual Transmissions:
Manual Transmission Layouts and Components, Basic gear box construction, gear-sets with fixed axles, countershaft transmission and epicyclic gears, schemes for reverse gear. Transmission Power Flows, Numerical problems
Automatic Transmissions:
Level of automation, Gear shift mode, stepped and Continuously Variable Transmissions, synchronizer gear boxes, epi-cycloidal gear boxes, Design and analysis of planetary gear trains, Gear ratios and clutch engagement schedule, Clutch torques in steady state condition, Torque analysis in shifting process, Numerical problems
Course outcomes:
At the end of the course the student will be able to:
CO 1: Differentiate various types of chassis layouts, frames, front axles, springs, rear axles arrangements and other chassis components
CO 2:Explain the construction and working of various chassis components.
CO 3: Design various chassis components.
CO 4:Understand the vehicle power train system, match the ideal and engine transmission and select the power train ratio.
CO 5: Acquire the basic skills required to design and analyse manual and automatic transmission system.
Question paper pattern:
The SEE question paper will be set for 100 marks and the marks scored will be proportionately reduced to 60.
Textbook/ Textbooks
(1) PP.M. Heldt, Automotive Chassis, Chilton & Co. Edition, 1990
(2) N.K. Giri, Automotive Mechanics, Khanna Publications, 8th Edition, 2008
Reference Books
Joseph I Heintner, Automotive mechanics, Affiliate d East West Press, New Delhi/Madras,1967
(2) J. Fenton, Handbook of Automotive Powertrain and Chassis Design Professional Engineering Publishing, London 1 st Edition,1998
(3) Kirpal Singh, Automobile Engineering Vol. I, Standard publications, New Delhi.13th Edition, 2012