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I am trying to do an analysis of an electric carjack, i know the load, i know the torque require at the end of the jack(ive calculated it to be 5Nm). i know the typical electric car jack uses 12V 10A pmdc motor (about 3500rpm no load speed and stall torque 0.4Nm).

I know that to maximize the output torque of the motor i need a gearbox that'll give out the optimum mechanical advantage. I dont have any clue how the design of an eletric car jack gearbox which is on the market, but i know the dimensions of it,15x2x4cm, below is the link of my design base on the dimensions.

units are in cm and all the gears are fix to the shaft/motor.

http://img483.imageshack.us/img483/9297/gears23ax2.jpg [Broken]

Anyway, the gear arrangements will increase the motor torque 25times(assume super efficient).and so this will give out 25*0.4=10Nm. Well its larger than the required torque,so it'll work but wait..thats assuming if the gears are 100% efficient, and at stall torque..

So my question is can anybody like suggest any other gear arrangements which gives out more than mine or speculate what are the gear arrangements on the electric car jack on the market right now?

thank you

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# Guessing gearbox arrangements?

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