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# Manual Sequential Transmission System of Automobile

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Transmission System

Transmission System

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• 1. Manual Sequential Transmission System of Automobile MACHINE DESIGN PROJECT PRESENTATION 1Department Of Mechanical Engineering – Mohammad Ali Jinnah University, Islamabad
• 2. Group Member Registration No Rasikh Tariq ME 113006 Mehroze Ali Najmi ME 113071 Muhammad Taha ME113085 Zain Talib ME 113108 Muhammad Ali ME 113115 Muhammad Mubbasher Khan ME 113126 2Department Of Mechanical Engineering – Mohammad Ali Jinnah University, Islamabad
• 3. 3
• 4. Presentation Flow Input 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 4
• 5. G I4 I3I2 I1 O4O3O2O1 Pinion Clutch Input Shaft Output Shaft Shifting Fork Idler Sprocket to Wheel 5
• 6. Input Power Calculation 𝑊𝑜𝑟𝑘 𝐶𝑦𝑐𝑙𝑒 = 700 𝑘𝑃𝑎 × 72 𝑐𝑐 = 700 × 10−3 𝑁 𝑚2 × 72 × 10−6 𝑚3 = 5 0.4 𝑁𝑚 𝑃𝑜𝑤𝑒𝑟 = 𝑊𝑜𝑟𝑘 𝐶𝑦𝑐𝑙𝑒 × 𝑟𝑒𝑣 𝑠𝑒𝑐 × 𝑐𝑦𝑐 𝑟𝑒𝑣 = 50.4 × 360 = 18144 𝑤𝑎𝑡𝑡 = 24.32 ℎ𝑝 This is the power that will be delivered to the pinion from the crankshaft of engine. 6
• 7. Assumptions Full depth pinion and full depth gear with pressure angle = 20° Diametral pitch=𝑃𝑑=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 ) 7
• 8. Pinion-Idler-Gear Type of Gear Symbol Magnitude Pinion Teeth Np 18 teeth Pinion Diameter dp 3 inches Gear Ratio mG 1.1 teeth Idler Diameter di 3.3 inches Gear Diameter dg 3.63 inches Idler Radius ri 1.65 inches Gear Radius rg 1.815 inches Idler Teeth NI 20 teeth Gear Teeth NG 22 teeth RPM of Idler ωi 9090.909091 RPM RPM of Gear ωg 8264.46281 RPM Torque on Pinion Tp 153.3662335 lb-in Torque on Idler TI 168.7028569 lb-in Torque on Gear TG 185.5731425 lb-in Tangential Component on Pinion WtP 102.2441557 lb Tangential Component on Idler WtI 102.2441557 lb Tangential Component on Gear Wtg 102.2441557 lb 8
• 9. Bending-Fatigue Strength Life Factor: 𝐾𝐿 = 0.89 Uncorrected Bending-Fatigue Strength 𝑠𝑓𝑏 ′ = 48458 𝑝𝑠𝑖 Corrected Bending-Fatigue Strength 𝑠𝑓𝑏 = 28751.7 𝑝𝑠𝑖 9
• 10. Surface Fatigue Strength Life Factor 𝐶𝐿 = 0.84 Uncorrected Surface-Fatigue Strength 𝑠𝑓𝑐 ′ = 124100 𝑝𝑠𝑖 Corrected Surface-Fatigue Strength 𝑠𝑓𝑐 = 69496 𝑝𝑠𝑖 10
• 11. Bending Stresses on Pinion 𝜎 𝑏 𝑝𝑖𝑛𝑖𝑜𝑛 = 5324.1 𝑝𝑠𝑖 Factor of Safety 𝑁𝑏 𝑝𝑖𝑛𝑖𝑜𝑛 = 3.7 11
• 12. Surface Stresses on Pinion-Idler Mesh 𝜎𝑐 𝑝𝑖𝑛𝑖𝑜𝑛 = 45666.2 𝑝𝑠𝑖 Factor of Safety 𝑁𝑐 𝑝𝑖𝑛𝑖𝑜𝑛−𝑖𝑑𝑙𝑒𝑟 = 2.31 12
• 13. Design of Transmission System Input Shaft Output Shaft Gear Ratio Torque (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 13
• 14. 1 2 3 4 Gear & Torque on Output Shaft 185.5731425 161.9834711 98 67.36305074 0 20 40 60 80 100 120 140 160 180 200 Gear & Torque on Output Shaft 1 2 3 4 Gear & RPM on Output Shaft 3000 5000 7000 9000 0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 Gear & RPM on Output Shaft 14
• 15. Shaft Design 15
• 16. 3.63 in 2.47 in GI4I3 I2 I1 1.5 in1.31 in R2y R1y A 3 in 5 in 7 in 9 in 11 in 13 in G = Gear I4 = 4th Input Gear I3 = 3rd Input Gear I2 = 2nd Input Gear I1 = 1st Input Gear 16
• 17. 0 200 400 600 800 1000 1200 1400 1600 1800 0 3 5 7 9 11 SHEAR'Y'IN(LB) LENGTH OF SHAFT 'X' (IN) Shear Magnitude 17
• 18. 0 500 1000 1500 2000 2500 3000 3500 4000 0 3 5 7 9 11 MOMENTIN'Y'(LB.IN) LENGTH OF SHAFT 'X' (IN) Moment Magnitude 18
• 19. Diameter of Shaft 1.819 inches 19
• 20. Gear Shifting Mechanism 20
• 21. 21 Moving Input Shaft Static Output Shaft but gears are moving
• 22. 22 Input Shaft
• 23. 23 Tuning Fork is engaged
• 24. 24
• 25. 25
• 26. 26
• 27. Thank You! 27