The gearbox has 200 full-depth large fillet teeth, double-reduction spur-gear gear set where the input pinion...
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The gearbox has 200⁰ full-depth large fillet teeth, double-reduction spur-gear gear set where the input pinion is to be regarded as the weakest element of the gear set. The gear ratios are such that shaft 1 rotates at four times the speed of shaft 2, and shaft 2 rotates at five times the speed of shaft 3. The life goal is about 5(109) pinion revolutions. The absolute value of the pitch variation is such that the transmission is less accurate. The gear finish is by a hobbing process and the materials are 4140 steels, heat-treated to 302 Brinell, for all gears and shafts. It is recommended that a module is 6mm and a factor of safety of 3 be used for gears. The gearbox is driving a crushing machine and the motor should supply uniform power of 10kW at 19rev/s. For a reliability of 0.99. design the gearbox by: (a) Sizing the gears. (b) Test for bending and surface fatigue on gears. (c) Design the supporting shafts and draw their sketches. (d) Select appropriate bearings. (c) Also determine the output torque and speed. Note: Try and make your design as compact as possible because of space limitations. Show all your workings and clearly state all your assumptions. The gearbox has 200⁰ full-depth large fillet teeth, double-reduction spur-gear gear set where the input pinion is to be regarded as the weakest element of the gear set. The gear ratios are such that shaft 1 rotates at four times the speed of shaft 2, and shaft 2 rotates at five times the speed of shaft 3. The life goal is about 5(109) pinion revolutions. The absolute value of the pitch variation is such that the transmission is less accurate. The gear finish is by a hobbing process and the materials are 4140 steels, heat-treated to 302 Brinell, for all gears and shafts. It is recommended that a module is 6mm and a factor of safety of 3 be used for gears. The gearbox is driving a crushing machine and the motor should supply uniform power of 10kW at 19rev/s. For a reliability of 0.99. design the gearbox by: (a) Sizing the gears. (b) Test for bending and surface fatigue on gears. (c) Design the supporting shafts and draw their sketches. (d) Select appropriate bearings. (c) Also determine the output torque and speed. Note: Try and make your design as compact as possible because of space limitations. Show all your workings and clearly state all your assumptions.
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Related Book For
Intermediate Accounting
ISBN: 978-0071339476
Volume 1, 6th Edition
Authors: Beechy Thomas, Conrod Joan, Farrell Elizabeth, McLeod Dick I
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