DIt is required to design a pair of spur gears with 20° full-depth involute teeth. The input shaft rotates at 720 rpm and receives 5 kW power through a lexible coupling. The speed of the output shaft should be 144 rpm. The pinion as well as the gear are made of steel Fe 410 (S. = 410 N/mm). The service factor.for the application is 1.25. The gears are machined to meet the specifications of Grade 6. %3D [LO 6, 7] (i) Assume suitable number of teeth for the pinion and the gear. (ii) For preliminary calculations, assume the pitch line velocity as 5 m/s and the factor of safety as 2. Estimate the module and select the first preference value of the module. (iii) Using this value of the module, calculate the pitch circle diameters of the pinion and gear and the face width. (iv) Determine static load and the dynamic load by Buckingham's equation. Also calculate the beam strength and the correct value of factor of safety based on beam strength. (v) Using a factor of safety of 2 for wear strength, specify the surface hardness for [Ans. (i) 18 and 90 teeth, (ii) 4.89 or 5 mm, gears. (iii) 90, 450 and 50 mm, (iv) 1473.66, 5993 and 10523.33 N; (fs) = 1.34 (v) 361.33 or 370 BHN]

DIt is required to design a pair of spur gears with 20° full-depth involute teeth. The input shaft rotates at 720 rpm and receives 5 kW power through a lexible coupling. The speed of the output shaft should be 144 rpm. The pinion as well as the gear are made of steel Fe 410 (S. = 410 N/mm). The service factor.for the application is 1.25. The gears are machined to meet the specifications of Grade 6. %3D [LO 6, 7] (i) Assume suitable number of teeth for the pinion and the gear. (ii) For preliminary calculations, assume the pitch line velocity as 5 m/s and the factor of safety as 2. Estimate the module and select the first preference value of the module. (iii) Using this value of the module, calculate the pitch circle diameters of the pinion and gear and the face width. (iv) Determine static load and the dynamic load by Buckingham's equation. Also calculate the beam strength and the correct value of factor of safety based on beam strength. (v) Using a factor of safety of 2 for wear strength, specify the surface hardness for [Ans. (i) 18 and 90 teeth, (ii) 4.89 or 5 mm, gears. (iii) 90, 450 and 50 mm, (iv) 1473.66, 5993 and 10523.33 N; (fs) = 1.34 (v) 361.33 or 370 BHN]

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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