Question

A step down gear drive is used in a conveyor system. The input pinion is made of 18 teeth runs at 1720 rpm, the driven gear runs at 860 rpm. The gears are supported on less rigid mountings, less accurate gears. The gears are made by hobbing process. Find: (a) The tooth bending strength of both wheels and the maximum power that can be transmitted to the drive (b) By considering surface durability conditions find the_maximum power that can be transmitted to the drive Gear Steel, 280 Bhn Hobbed Conveyor drive with moderate shock 860 rpm Pinion m= 2.5 mm Z = 18 20 full-depth teeth Steel, 340 Bhn Electric moto 1720 rpm Face width of the gear and pinion -35 mm, Module 2.5 mm, pressure angle -20° Sut 420 MPa for pinion, Sut385 MPa for gear If necessary you can make assumptions for the problem. :moderate shock eavy shock Driven machinery uniform medium Sorce of power 090 95% 99% Reliability 1.75 2.0 Factor of safety :108 Life

Answer 1

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