worm gears in powertrain of baja buggy |
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deepak123shukla
Double Secret Probation Joined: Jun/07/2015 Location: indore Status: Offline Points: 5 |
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Posted: Jun/07/2015 at 12:16pm |
I was wondering that why cannot we use worm gears in powertrain of a baja buggy.for it can give us large reduction along with reducing overall weight of the assembly. though I have searched abt the worm gears used in automobile;it was in 1960s , so can we retrieve that technology.
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Pedro UFPBaja
Baja Godfather Joined: Mar/03/2010 Location: Brazil Status: Offline Points: 886 |
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Unlike with others types of gear sets, when using worm gear the direction of transmission (input shaft vs output shaft) is not reversible. Will be needed a ratchet or the wheels will lock when the driver stop pushing the throttle. So your system will be unable to perform engine-brake to reduce the speed on deceleration. With a ratchet will be a huge gap on the acceleration curve because the engine and the transmission will first synchronizing again before perform the increase of rpm. Possibly locking the wheels at some time on tre process.
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Nate
Welding Master Joined: Jun/16/2014 Location: Ames, IA Status: Offline Points: 285 |
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You could say that's an advantage having the ability to engine brake... all depends on how you want your car to handle.
http://www.machinerylubrication.com/Read/1080/worm-gears Sounds like lubrication is the reason to not use it. You'll also only have a forward gear, and like pedro said, ratcheting or spraging is the only way to move the car forward when the engine is slowed or stopped. |
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Iowa State University Cyclone Racing 2013 - 2016
Tech Director, DAQ, Media, Manufacturing, Radios 2016 - S&T, Maneuv, & Endurance Driver "Because BAJA" "Because RACECAR" |
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deepak123shukla
Double Secret Probation Joined: Jun/07/2015 Location: indore Status: Offline Points: 5 |
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I thought it may be the lead angle which is the limiting factor by which we can say if the gears will rotate the worm or not.
so if that satisfies I think there is no harm in using. |
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collinskl1
Baja Godfather Joined: Jan/21/2009 Location: Saginaw, MI Status: Offline Points: 1056 |
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Worm gears are certainly able to be backdriven. Deepak is on the right train of thought with the point about the lead angle... certain leads generate a geometry that can't be backdriven.
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Kyle Collins
Lipscomb University Alumni 2x Project Manager Nexteer Automotive Product Engineer, Electronic Power Steering ... and the 8th simple machine: a bigger hammer. |
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Pedro UFPBaja
Baja Godfather Joined: Mar/03/2010 Location: Brazil Status: Offline Points: 886 |
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Well, even with lead angle that allows reverse direction, it's not an efficient configuration, too much friction.
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collinskl1
Baja Godfather Joined: Jan/21/2009 Location: Saginaw, MI Status: Offline Points: 1056 |
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There is certainly an efficiency hit compared to spur gears, but depending on your design space it may be acceptable.
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Kyle Collins
Lipscomb University Alumni 2x Project Manager Nexteer Automotive Product Engineer, Electronic Power Steering ... and the 8th simple machine: a bigger hammer. |
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