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This document is intended as an update towards the progress of our project group in ME344-Machine Design on the manual transmission design project. Our rst assignment was to project values for the spacing between the in-put/mainshafts and the countershaft (c), as well as the diametrical pitch for the gears (P). With these values set as variables, we were able to determine the diameter of each of the twelve gears (d1; d2:::), and number of teeth per gear (N1; N2; :::). Project Statement You are required to design a six-speed gearbox (transmission). A schematic of the gearbox is shown below. The assembly consists of a number of gears distributed on two shafts; the main & the counter shafts. The calculations were then carried out using MathCAD’s Given/Find functionality. Initial guesses of 1 were placed into the \Given” section of the document as well as the c and P values. Units were given in proper locations to insure that proper units were displayed on all answers. The design parameters we have chosen seem to work well with the spirit of this exercise. Checks have ben performed on the calculations to insure that we are seeing viable/accurate numbers. Our nal numbers had a mean deviation of 0.0477 on the nal gear ratios, for a mean deviation percentage of 1.8% with a maximum 4.2% deviation seen on rst gear, the least used (ie used for lower durations than other gears, esp 5th and 6th gears).
Tags:speed gearbox, gear ratios, design parameters, mean deviation, initial guesses
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