AUTOMOTIVE MECHANICS-Automobile engineering 6th sem full syllabus

AUTOMOTIVE MECHANICS

 

Subject Title                           :           AUTOMOTIVE MECHANICS

Sem                                         :           VI

Subject Code                         :           A

Hours Per Week                    :           04

Hours Per Semester              :           64

 

TOPIC ANALYSIS

SL.No

Major Topics

Hours Allotted

Weightage of Marks

1

Performance of IC engines

10

25

2

Gear box

06

15

3

Steering system

04

10

4

Brake system

14

35

5

Springs

06

15

6

Performance of vehicle

15

35

7

Propeller shaft

05

10

8

Tests & Revisions

04

-

 

Total

64

145

 

 

 

 

 

GENERAL EDUCATIONAL OBJECTIVES

 

1.0        Understand the performance parameters of IC engine along with their efficiencies.

2.0        Know the procedure for calculating the different speed and gear ratio’s.

3.0        Know the different types of steering gear mechanism and to calculate different

Parameters of steering.

4.0        Understand the different parameters of the braking phenomena like braking distance, 

Breaking torque, mean lining pressure etc.

5.0        Learn calculating different parameters of the braking phenomenon.

6.0        Know the nomenclature of coil spring and leaf spring.

7.0        Learn calculating different parameters of the coil spring and leaf spring.

8.0        Know different types of forces acting on the vehicle.

9.0        Learn to find different performance parameters of vehicle.

10.0          Know the need of hallow propeller shaft.

11.0          Learn to calculate the torque and power transmitted by the propeller shaft.

 

 

 

CONTENT DETAILS

 

1.0  Performance of IC engines

 

Definition of IP, BP, FP, MEP, IMEP, BMEP, engine torque, piston speed along with mathematical expression – mechanical, thermal, indicated thermal, brake thermal, volumetric, air standard, relative efficiencies – SFC, BSFC, ISFC, A/F, heat balance sheet along with mathematical expression and problems – Morse test with problems – William line method – performance curves.

 

2.0  Gear box

 

Procedure for calculating speed ratio & gear ratio for 3 speed & 4 speed gear box – problems.

 

3.0  Steering system

 

Definition of wheel base, wheel track, overall length, front over hung, rear over hung, turning circle radius – difference between Ackerman & Davis steering gear mechanism – equation for correct steering – expression for turning circle radii – Ackerman steering gear mechanism expression – problems.

 

4.0  Brakes

 

Definition of stopping distance, braking efficiency. Braking torque, leading shoe, trailing shoe – expression for stopping distance – equation for braking torque on leading and trailing shoe – expression for deceleration and load distribution during braking of vehicle – mean lining pressure and heat generated – weight transfer – problems.

 

5.0  Springs

 

Nomenclature of coil springs – stresses in helical coil spring – problems – stresses in semi elliptical leaf spring – definition of over length, effective length, ineffective length, and camber – problems.

 

6.0  Performance of vehicle

 

Mention different types of resistances – state the equations of wind resistance, rolling resistance & gradient resistance – power required for propulsion with mathematical expression – mathematical expression of traction & tractive effort – concept of surplus power –acceleration, gradiability and drawbar pull with mathematical expression – definition of equivalent weight with mathematical expression – expression of maximum acceleration & reactions when vehicle is driven on front wheel, rear wheel and four wheel – problems.

 

 

 

7.0  Propeller shaft

 

Advantages of hollow propeller shaft – equation for calculating torque transmitted by hollow propeller shaft - equation for calculating power transmitted by hollow propeller shaft – problems.

 

 

 

Specific instruction objectives:

 

1.0  Performance of IC engines

 

1.1      Define IP, BP, FP, MEP, IMEP, BMEP, engine torque, piston speed.

1.2       Know the mathematical expressions for above.

1.3       Define dynamometer.

1.4       Mention different types of dynamometer.

1.5       Explain prony brake dynamometer, rope brake dynamometer, hydraulic

Dynamometer and eddy current dynamometer with sketches.

1.6        Define mechanical efficiency, thermal efficiency, indicated thermal efficiency, brake

Thermal efficiency, volumetric efficiency, air standard efficiency, relative

Efficiency, Specific fuel consumption, brake specific fuel consumption, indicated

Specific fuel, Consumption, air fuel ratio, heat balance sheet.

1.7        Know the mathematical expressions for the above.

1.8        Explain heat balance sheet.

1.9        Solve problems to calculate the parameters mentioned above.

1.10          Explain Morse test procedure

1.11          Solve problems on Morse test.

1.12          Explain William line method to find friction power.

1.13          Study engine performance curves.

 

2.0  Gear box

 

2.1        Explain the procedure of calculating speed ratio and Gear ratio for three speed &

Four speed gear box with sketches.

2.2        Solve the problems on gear box to find gear ratio, no of teeth, distance between

Shafts and exact gear ratios.

 

3.0  Steering system

 

3.1        Define the terms, wheel base, track width, overall length, front over hung,

rear over hung, turning circle radius,

3.2        State differences between Ackerman and Davis steering gear mechanism.

3.3        Derive an equation for correct steering.

3.4        Derive an expression to find turning circle radius of all the four wheels.

3.5        Derive an equation to find angle of inside lock and out side lock by Ackerman

Steering gear mechanism by analytical method.

3.6        Solve problems on Ackerman steering gear mechanism.

 

4.0  Brakes

 

4.1       Define the terms

                        4.1.1    Stopping distance and braking efficiency.

                        4.1.2    Braking torque, leading shoe, trailing shoe.

4.2       Derive an equation for stopping distance.

            4.3       Derive the equations for braking torque on leading shoe and trailing shoe of

Internal expanding shoe brake.

4.4              Derive the expressions for deceleration and load distribution on front and rear axle

in case of braking of vehicle, for the following cases.

4.4.1        Rear wheel braking.

4.4.2        Front wheel braking.

4.4.3        All wheel braking.

4.5              Derive an expression to calculate mean lining pressure and heat generated during

braking operation.

4.6              Explain the phenomena of weight transfer during braking.

4.7              Solve simple problems on above.

 

5.0  Springs

 

5.1        Nomenclature of coil spring with equations - solid length, free length, spring index,

Pitch.

5.2        State the equations of stresses & deflection in helical coil spring (circular cross

Section).

5.3        Solve simple problems on coil spring.

5.4        Introduction to design of leaf springs.

5.5        State the equation for bending stress and maximum deflection of semi elliptical leaf

Spring.

5.6        Define overall length & effective length, ineffective length, camber.

5.7        Simple problems on leaf springs.

 

 

 

6.0  Performance of vehicle

 

6.1         Mention different types of resistances.

6.2         State the equation for, wind resistance, rolling resistance and grade resistance.

6.3         Explain power required for propulsion with mathematical expression.

6.4         Explain with mathematical expression of traction and tractive effort.

6.5         Know the concept of surplus power.

6.6         Explain acceleration, gradiability and drawbar pull with mathematical expressions.

6.7         Define equivalent weight with mathematical expression.

6.8         State the expression for maximum acceleration & reactions when vehicle is driven

On front wheel, rear wheel and four wheels.

6.9        Solve simple problems.

 

7.0  Propeller shaft

 

7.1       List the advantages of hollow propeller shaft.

7.2       State an equation for calculating torque transmitted by hollow propeller shaft.

7.3       State an equation for calculating the power transmitted by hollow propeller shaft.

7.4       Solve simple problems.

 

 

REFERENCE BOOKS:

1.         Automotive Mechanics           -           N.K. Giri (Khanna Publishers)

2.         Automobile design Problem   -           R.S. Agarwal

3.         Machine design                       -           R.S. Khurmi & J.K. Gupta (S.Chand Publications)

4.         Machine Design                      -           Sharma & Agarwal

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