Developing an Auger (Earth Drill) one stage Gearbox System. A comparing study between two planetary gears systems, spur and h

Design & Technology
Pages 56 (14056 words)
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Results The optimal numbers of teeth decided upon were 44 for the ring gear followed by 17 for the planetary gears and 10 for the sun gear. The gears were all scaled relative to each other so that the largest dimensions of the gearbox were not violated. The lubricant was chosen under AGMA 9005-E02 guidelines and it indicated that the lubricant required would be one that lies as close as possible to ISO 1000 grade with a kinematic viscosity of 1632.5 cSt at 40oC.


On the other hand the helical gearbox design would require output bearings of 7309 BE while input bearings of 7209 BE. The gearing materials were found out best to be AISI 304 while the casing ought to be created from cast iron. Cost comparison shows that spur gearbox is much cheaper especially because of the lower cost of the ring spur gear in comparison to the ring helical gear. Therefore the spur gearbox design was chosen as the optimal configuration for the current problem at hand. Summary In order to determine the best possible solution for a gearbox for an auger earth drill an extensive investigation was carried out. The investigation was begun with a literature review of the relevant means to transmit mechanical power such as belts, shafts, torque converters, mechanical couplings and gears. Given the relative advantages of gears in terms of power and speed scaling as well as the cost, it was decided to stick with gears to power an auger earth drill. The commonly used gear types which are spur and helical were dealt with in detail to understand their operational perspectives. Bevels gears were also investigated but rejected early on. ...
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