Gears and CVT |
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zeeshan
Bolt Sorter Joined: Dec/03/2012 Status: Offline Points: 4 |
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Posted: Dec/03/2012 at 4:56am |
Is it a good idea to use 2 constant reduction gears alongwith CVT 1 can be for climbing where high traction is required and other can be for high speed Also how to decide these ratios for high speed its alright but for traction how do I calculate the reduction ratio
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zglazer
Baja Godfather Joined: May/27/2012 Location: Metro Detroit Status: Offline Points: 593 |
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Selecting gearbox ratios is one of the most difficult aspects of drivetrain design and it's something that you'll have to figure out yourself based on the other components in your drivetrain as well as the design aspects and goals for the entire baja vehicle. Whether or not that gives you a two-speed gearbox as an ideal solution will depend on your specific situation.
For selecting ratios, you just need to look at the different physical conditions your baja will be under throughout its life and decide which aspects you want to optimize it for and in what way it should be optimized. I'm not going to be more specific than that because it's a very open-ended problem and there are many different approaches to it. One thing I will say is that traction doesn't depend on your ratio; it's a function of the interaction between your tires and the ground surface as well as the vehicle weight. A larger reduction increases the amount of force you have at the ground which will allow you to take better advantage of the amount of traction you have, but if the reduction is too high then you'll break traction with the ground which isn't desirable. |
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Zack Glazer
McGill Baja Racing Alumnus 2009-2013 http://baja.mcgilleus.ca/ 2012-2013 Drivetrain Designer |
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