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Unread 06-18-2017, 02:42 AM
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adios adios is offline
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Help with gear ratios

Hi, guys, I'm sorry to seem like a rookie but my friends and I are having problems understanding gearboxes. From our understanding, the first stage of most drive gearboxes (the tough box) includes two motors each with their own
gear attached to it. Both gears act on the same middle gear. We tried treating it as a planetary gear system without a ring gear but we just got more confused. How do we calculate the ratio of a gearbox with two 10 teeth "planets" that are spinning at the same speed in the same direction as a 40 tooth "sun" gear? Is it a 4:1 ratio (40 for driven/10 for the drive) or 2:1 (40 for driven/adding both 10 tooth gears up.)

I also read that no matter how many motors are added, the speed of the output won't change but the torque will increase. For example, 2 motors mean twice the torque 3 means thrice and so on. I don't really understand how this works, shouldn't adding more motors increase the speed of the output as well?

Thank you so much
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