Bearings The shafts are supported by bearings. Select approriate type and size of bearing based on the following considerations: Load magnitudes Load directions Space limitations The tolerancing between the bearing seat and the shaft needs to be specified as it is in the gear/shaft interface. The bearings need to be mounted on your gearbox casing. Therefore, your gearbox casing needs to be strong enough to resist the shaft support loads. Gearbox Housing The gearbox housing or casing serves the following functions: Support the bearing housings as noted above Contain the lubricant Keep the gears in contact The first two functions are obvious. The last one refers to the requirement of the gearbox to resist the torque. This is either done by designing a flange-mounted gearbox or by fixing the gearbox on the "floor", ie chassis. In this project, there are obvious reasons against using a floor-mounted gearbox. You must be able to figure out what they are. Lubrication Lubricants in a gearbox serve the following functions: reduce the coefficient friction between mating surfaces remove the dissipation heat protect bearings and gears against external contaminants The heat is caused by friction and this corresponds to a loss from your useful power. The gearbox efficiencies typically range from 90% to 98%. The last function needs gaskets and seals at the input and output shafts. You must consider lubrication in your design. This consideration must include choice of lubricant and mode of lubrication. We will cover some aspects of lubrication in the lecture on Tribology. MAIN CLUTCH It is difficult to chang
Posted on: Fri, 16 Aug 2013 19:14:56 +0000
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