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Manual Sequential Transmission System of

AutomobileMACHINE DESIGN PROJECT PRESENTATION

Department Of Mechanica l Engineer ing – Mohammad Al i J innah Univers i ty , I s lamabad

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Group Member Registration NoRasikh Tariq ME 113006

Mehroze Ali Najmi ME 113071

Muhammad Taha ME113085

Zain Talib ME 113108

Muhammad Ali ME 113115

Muhammad Mubbasher Khan ME 113126

Department Of Mechanical Engineer ing – Mohammad Al i J innah Univers i ty, I s lamabad

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Presentation FlowInput Power Calculation

Design of Pinion-Idler-Gear

Bending Fatigue Strength of Pinion-Idler-Gear Mesh

Surface Fatigue Strength of Pinion-Idler-Gear Mesh

Bending Stresses on Pinion

Surface Stresses on Pinion-Idler

Design of Transmission System & Shaft Design

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G

I4I3I2

I1

O4O3O2O1

Pinion

ClutchInput Shaft

Output Shaft

Shifting Fork

Idler

Sprocket to

Wheel

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Input Power Calculation

This is the power that will be delivered to the pinion from the crankshaft of engine.

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Assumptions Full depth pinion and full depth gear with pressure angle = 20°

Diametral pitch==6 (Coarse Pitch)

Minimum number of teeth on pinion=18

Gear Ratio = mG = 1.1

Pinion input angular velocity ωp is 10000 RPM

Table 11.4 (At 20° pressure angle the minimum number of teeth are 18 )

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Pinion-Idler-GearType of Gear Symbol Magnitude

Pinion Teeth Np 18 teethPinion Diameter dp 3 inchesGear Ratio mG 1.1 teethIdler Diameter di 3.3 inchesGear Diameter dg 3.63 inchesIdler Radius ri 1.65 inchesGear Radius rg 1.815 inchesIdler Teeth NI 20 teethGear Teeth NG 22 teethRPM of Idler ωi 9090.909091 RPMRPM of Gear ωg 8264.46281 RPMTorque on Pinion Tp 153.3662335 lb-inTorque on Idler TI 168.7028569 lb-inTorque on Gear TG 185.5731425 lb-inTangential Component on Pinion WtP 102.2441557 lbTangential Component on Idler WtI 102.2441557 lbTangential Component on Gear Wtg 102.2441557 lb

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Bending-Fatigue Strength Life Factor:

Uncorrected Bending-Fatigue Strength

Corrected Bending-Fatigue Strength

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Surface Fatigue Strength Life Factor

Uncorrected Surface-Fatigue Strength

Corrected Surface-Fatigue Strength

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Bending Stresses on Pinion

Factor of Safety

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Surface Stresses on Pinion-Idler Mesh

Factor of Safety

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Design of Transmission SystemInput Shaft Output Shaft

Gear RatioTorque

(lb-in)Diameter

(in) RPM Number of Teeth

Torque(lb-in)

Diameter(in) RPM Number of

Teeth

Mesh I1-O1 67.36 1.31 8264.4 8 185.57 3.63 3000 22 2.75

Mesh I2-O2 98 1.5 8264.4 12 161.98 2.47 5000 20 1.65

Mesh I3-O3 161.9 2.47 8264.4 20 98 1.5 7000 12 1.18

Mesh I4-O4 185.5 3.63 8264.4 22 67.36 1.31 9000 8 0.91

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1 2 3 4

Gear & Torque on Output Shaft

185.573142535134 161.98347107438 98 67.3630507402538

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30

50

70

90

110

130

150

170

190

Gear & Torque on Output Shaft

1 2 3 4

Gear & RPM on Output Shaft 3000 5000 7000 9000

500

1500

2500

3500

4500

5500

6500

7500

8500

9500

Gear & RPM on Output Shaft

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Shaft Design

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3.63 in 2.47 in

GI4I3I2

I1

1.5 in 1.31 in

R2yR1y

A

3 in

5 in

7 in

9 in

11 in

13 inG = GearI4 = 4th Input GearI3 = 3rd Input GearI2 = 2nd Input GearI1 = 1st Input Gear

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0 3 5 7 9 110

200

400

600

800

1000

1200

1400

1600

1800

Shear Magnitude

Length Of Shaft 'X' (In)

Shea

r 'Y

' in

(lb)

18

0 3 5 7 9 110

500

1000

1500

2000

2500

3000

3500

4000

Moment Magnitude

Length Of Shaft 'X' (In)

Mom

ent

in 'Y

' (lb

.in)

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Diameter of Shaft 1.819 inches

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Gear Shifting Mechanism

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Moving Input Shaft

Static Output Shaft but gears are moving

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Input Shaft

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Tuning Fork is engaged

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Thank You!