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GEARBOX DESIGNIDEASMEE30003
Mim Eguiazarian - David Orlowski - Yasith Dhamsara - Myles O’Donnell
Our TaskDesigning a gearbox to complete given task:
• Pulling a mass of minimum 10kg up a sloped ramp of ~46 degrees
• Must pull the mass for a minimum length of 50cm
• Has to pull the mass up the slope in the quickest amount of time
Is to perform the task utilising only the Motor provided
Theory Relating To The Task• Torque - Lifting potential
• Gear ratios - Transfer of torque
• Shafts
• Bearings
• Lubrication
Analysing the Performance FormulaPerformance is calculated according to the formula:
P = m*g*h m*g*h t*V*I t*D^3
Important factors to minimise - D (longest Axial Distance) t (time taken to travel 50cm)
Must base design around a compromise between the two to obtain greatest performance.
Initial Ideas For DesignKeep it simple
Simple constant mesh arrangement of spur gears with trains - Worried about torque
Planetary gears/Epicyclic gearbox - Compact - May be too difficult
Keep a small footprint for the gearbox
Offset gearbox arrangement
Gearbox Concepts
Key <--· Black - Motor· Grey - Outer casing· Green - Shaft and Shaft Supports · Red, Blue and Yellow - Gears
o Red - Stage 1 Gears with Ratio of 4:1o Blue - Stage 2 Gears with Ratio of 3.5:1o Yellow - Stage 3 Gears with Ratio of 3:1
Overall Ratio: 4*3.5*3 = 42:1
Mooted idea
Initial CalculationsCalculating the Minimum Theoretical torque of the gear shaft needed to lift the weight up the ramp
Initial CalculationsEquations used to calculate the changes in the torque
and angular speeds with the relative gear ratios
ReferencesArticles of Interest
Gear train optimization based on minimum volume/weight design
Golabi, Sa'Id ; Fesharaki, Javad Jafari ; Yazdipoor, MaryamMechanism and Machine Theory, March 2014, Vol.73, pp.197-217[Peer Reviewed Journal]
A practical approach to the optimization of gear trains with spur gears
Marjanovic, Nenad ; Isailovic, Biserka ; Marjanovic, Vesna ; Milojevic, Zoran ; Blagojevic, Mirko ; Bojic, MiloradMechanism and Machine Theory, July, 2012, Vol.53, p.1(16)[Peer Reviewed Journal]
Books of Interest
Fundamentals of Machine Component DesignJuvinall, RC & Marshek, KM, Fundamentals of Machine Component Design, 5th edn, Wiley, 2013
Design Basic of Industrial GearboxesAndrzej Maciejczyk ; Zbigniew Zdziennicki
Websites of Interest
www.engineeringtoolbox.com