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Transmission System
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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!