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Question: 6 a a bronze spur pinion with an endurance strength...

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6. a) A bronze spur pinion with an endurance strength of 83 MN/m2, rotates at 600 RPM and drives a cast steel spur gear of endurance strength 103 MN/m2, at a transmission ratio of 4 to 1. The pinion has 16 standard 20° full depth involute teeth of 8 module. The face width of both gears is 90mm i) Determine which gear is the weaker, the pinion or the wheel gear ii) Calculate the pitch line velocity of the meshing gears iii) Calculate the allowable stress in the gear using the correct velocity factor. iv) Use the Lewis equation to determine from the standpoint of strength the force mar mar (3 marks) (4 marks) (2 marks) that can be transmitted between the meshing gear teeth v) Calculate the power that can be transmitted between the gears Lewis form Factor for 20° full depth involute gear profile used for Lewis strength equation No of teeth |y 12 13 14 No of teeth |y No of teeth |y No of teeth |y 0.078 18 0.083 19 0.088 20 0.092 21 0.09423 0.09625 0.098 27 0.100 30 0.102 34 0.10438 0.106 43 0.10850 0.111 60 0.114 75 0.118100 0.122150 0.126300 0.130 Rack 0.134 0.138 0.142 0.146 0.150 0.154 b) What is interference when applied to meshing gears and how can good design avoid interference? (4 marks)

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