The figure shows a double-reduction helical gearset. Pinion 2 is the driver rotating with 1200 rev/min, receiving a torq

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The Figure Shows A Double Reduction Helical Gearset Pinion 2 Is The Driver Rotating With 1200 Rev Min Receiving A Torq 1 (136.38 KiB) Viewed 12 times

The figure shows a double-reduction helical gearset. Pinion 2 is the driver rotating with 1200 rev/min, receiving a torque of T₂ = 150 N-m from its shaft a in the direction shown. Pinion 2 has a normal module of 3 mm/teeth, 14 teeth, and a normal pressure angle of 200 and is cut right-handed with a helix angle of 30°. The mating gear 3 on shaft b has 36 teeth. Gear 4, which is the driver for the second pair of gears in the train, has a normal module of 5 mm/teeth, 15 teeth, and a normal pressure angle of 20⁰ and is cut left-handed with a helix angle of 15º. Mating gear 5 has 45 teeth. a) Find the train value e between the first and last gears 2 and 5. What is the rotational speed and direction of the last gear 5. b) Check whether or not the teeth numbers are appropriate to guard against interference. c) Find the magnitude and direction of the reaction forces exerted on bearings E and F on shaft c if the bearing E can take only radial load while the bearing F is mounted to take both radial and thrust loads. d) Find the bending and contact safety factors for the gears 4 and 5 assuming a face width of 50 mm. Other values can be taken same as in example 14-5 in the textbook. a Dimensions in mm. |80 →80 → E 5 * A 75-40 F 3 2 50 50 B T₂ 1200 rev/min