This article explains the process of selecting gears and pinions for power transmission with solved examples. It includes the calculation of actual and design torque, gear ratio, and module. The selected gears and pinions are chosen from available catalogues with their part number, module, pressure angle, rated torque, and material.
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Solution for Problem no. 3 Gear no. 1 as per question no. 2 Given data 1.No. of teeth (Pinion): 66 2.No. of teeth (Gear): 80 3.Power: 40 KW 4.Rpm (Pinion) : 2000 5.Gear ratio: 1.5 6.Factor of Safety: 1.2 Gear Selection: RPM (Gear) = RPM (Pinion)/ Gear ratio =2000/1.2 =1667 Actual Torque to be transmitted: (PowerX9.5488)/Speed (gear) =(40000X9.5488)/1667 =229.12 Nm Design Torque to be transmitted: Actual Torque to be transmitted X Factor of Safety =229.12X1.2 =275 Nm Based on gears available in market, we have selected gear with module 2.5 as same can transmit this amount of torque. Module = 2.5 Module = diameter of gear / no. of teeth No of teeth: 66 No of teeth: 80 PINION GEAR
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Diameter of Gear = Module X no. of teeth = 2.5 X 80 = 200 mm Selected gear from available Catalogue: Part number: GEAHB Module: 2.5 Pressure angle: 20 deg Rated Torque: 396.36 Nm Material: S45C Equivalent Pinion Selection: Actual Torque to be transmitted: (PowerX9.5488)/Speed (pinion) =(40000X9.5488)/2000 =190.9 Nm Design Torque to be transmitted: Actual Torque to be transmitted X Factor of Safety =190.9X1.2 =229 Nm Based on gears available in market, we have selected gear with module 3.0 as same can transmit this amount of torque. Module = 2.5 Module = diameter of gear / no. of teeth Diameter of Gear = Module X no. of teeth = 2.5 X 66 = 165 mm Selected gear from available Catalogue: Part number: GEAHB Module: 2.5 Pressure angle: 20 deg Rated Torque: 404.75 Nm Material: S45C Equivalent
Gear no. 2 as per question no. 2 Given data 1.No. of teeth (Pinion): 50 2.No. of teeth (Gear): 70 3.Power: 40 KW 4.Rpm (Pinion) : 1667 5.Gear ratio: 1.4 6.Factor of Safety: 1.2 Gear Selection: RPM (Gear) = RPM (Pinion)/ Gear ratio =1667/1.4 =1191 Actual Torque to be transmitted: (PowerX9.5488)/Speed (gear) =(40000X9.5488)/1191 =320.7 Nm Design Torque to be transmitted: Actual Torque to be transmitted X Factor of Safety =320.7X1.2 =385 Nm Based on gears available in market, we have selected gear with module 2.5 as same can transmit this amount of torque. Module = 2.5 Module = diameter of gear / no. of teeth Diameter of Gear = Module X no. of teeth = 2.5 x 70 = 175 mm Selected gear from available Catalogue: Part number: GEAHB Module: 2.5 Pressure angle: 20 deg Rated Torque: 442.41 Nm Material: S45C Equivalent Pinion Selection:
Actual Torque to be transmitted: (PowerX9.5488)/Speed (Pinion) =(40000X9.5488)/1667 =229.12 Nm Design Torque to be transmitted: Actual Torque to be transmitted X Factor of Safety =229.12X1.2 =275 Nm Based on gears available in market, we have selected gear with module 2.5 as same can transmit this amount of torque. Module = 2.5 Module = diameter of gear / no. of teeth Diameter of Gear = Module X no. of teeth = 2.5 X 50 = 125 mm Selected gear from available Catalogue: Part number: GEAHB Module: 2.5 Pressure angle: 20 deg Rated Torque: 296.17 Nm Material: S45C Equivalent
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Gear no. 3 as per question no. 2 Given data 1.No. of teeth (Pinion): 40 2.No. of teeth (Gear): 60 3.Power: 40 KW 4.Rpm (Pinion) : 1667 5.Gear ratio: 1.5 6.Factor of Safety: 1.2 Gear Selection: RPM (Gear) = RPM (Pinion)/ Gear ratio =1191/1.5 =794 Actual Torque to be transmitted: (PowerX9.5488)/Speed (gear) =(40000X9.5488)/794 =481 Nm Design Torque to be transmitted: Actual Torque to be transmitted X Factor of Safety =481X1.2 =577.25 Nm Based on gears available in market, we have selected gear with module 3.0 as same can transmit this amount of torque. Module = 3.0 Module = diameter of gear / no. of teeth Diameter of Gear = Module X no. of teeth = 3.0 X 60 = 180 mm Selected gear from available Catalogue: Part number: GEAHB Module: 3.0 Pressure angle: 20 deg Rated Torque: 638.4 Nm Material: S45C Equivalent Pinion Selection:
Actual Torque to be transmitted: (PowerX9.5488)/Speed (pinion) =(40000X9.5488)/1191 =320.7 Nm Design Torque to be transmitted: Actual Torque to be transmitted X Factor of Safety =320.7X1.2 =385 Nm Based on gears available in market, we have selected gear with module 3.0 as same can transmit this amount of torque. Module = 3.0 Module = diameter of gear / no. of teeth Diameter of Gear = Module X no. of teeth = 3.0 X 40 = 120 mm Selected gear from available Catalogue: Part number: GEAHB Module: 3.0 Pressure angle: 20 deg Rated Torque: 386.49 Nm Material: S45C Equivalent
Gear no. 4 as per question no. 2 Given data 1.No. of teeth (Pinion): 41 2.No. of teeth (Gear): 50 3.Power: 40 KW 4.Rpm (Pinion) : 1667 5.Gear ratio: 1.2 6.Factor of Safety: 1.2 Gear Selection: RPM (Gear) = RPM (Pinion)/ Gear ratio =794/1.2 =662 Actual Torque to be transmitted: (PowerX9.5488)/Speed (gear) =(40000X9.5488)/662 =577 Nm Design Torque to be transmitted: Actual Torque to be transmitted X Factor of Safety =577X1.2 =692.3 Nm Based on gears available in market, we have selected gear with module 4.0 as same can transmit this amount of torque. Module = 4.0 Module = diameter of gear / no. of teeth Diameter of Gear = Module X no. of teeth = 4.0 X 50 = 200 mm Selected gear from available Catalogue: Part number: KHK MSGA4-50 Module: 4.0 Pressure angle: 20 deg Rated Torque: 3,650 Nm Material: SCM415 (AISI 4115) Alloy Steel Pinion Selection:
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Actual Torque to be transmitted: (PowerX9.5488)/Speed (Pinion) =(40000X9.5488)/794 =481 Nm Design Torque to be transmitted: Actual Torque to be transmitted X Factor of Safety =481X1.2 =577.25 Nm Based on gears available in market, we have selected gear with module 4.0 as same can transmit this amount of torque. Module = 4.0 Module = diameter of gear / no. of teeth Diameter of Gear = Module X no. of teeth = 4.0 X 41 = 164 mm Selected gear from available Catalogue: Part number: KHK MSGA4-40 Module: 4.0 Pressure angle: 20 deg Rated Torque: 2,290 Nm Material: SCM415 (AISI 4115) Alloy Steel Note: Gears are selected in such a way that inlet and outlet shaft are inline.