B.A.M.SCreative journey Sebastian Oyarce 9736166Andrew Pitsiakkos 9990070

Matthew Holst 2052946Benjamin Strom 7662572

Performance equationm = mass of weight (kg)g = Acceleration due to gravity (m/s^2)h = Height that the weight is lifted (m)V = Voltage supplied ( V) I = Current Supplied ( A)D = Max axial length of the gearbox (m)

Required gear ratio

Since power stays roughly constant throughout the gearbox it is desired to decrease the output torque required in order to increase the output angular speed (which will decrease the time taken to lift the weight) therefore the mass of the block and radius of the shaft were minimised .A safety factor may also need to be included.

Assumptions include:• No friction• Rotational inertia of shaft and gear are relatively 0 in comparison

to mass lifted mg

Tension

• Features a compact gear design

• Uses a single drive shaft and a series of gears to achieve a large reduction, allowing for large weights to be lifted with relative ease.

Hoist Gearbox

https://gifs.com/gif/J6z6O9

First design (half moon)

This design arranges gears in a circular fashion.

Gears glued to the shafts

Second design (Triangular)

Idea came from the half moon design

Only fixed gears are the motor and the last gear in the train

Third design(Planetary gearbox):

http://forums.autodesk.com/autodesk/attachments/autodesk/78/316168/1/sun%20and%20planets.gif

One or two planetary gear systems can be placed in combination with each other to achieve the required torque output.

This gear design minimizes axial length by stacking this gear system to multiply reductions

Very difficult to assemble.

Fourth design (2 Shafts)

Compromise between planetary small axial length and simple design

Gears slip freely on the shafts with the exception of the motor and last gear on the train

Questions?