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Difference between jackshaft and drivehshaft.

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Legendkaran View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Legendkaran Quote  Post ReplyReply Direct Link To This Post Topic: Difference between jackshaft and drivehshaft.
    Posted: Aug/14/2012 at 5:58am
Can anyone please let me know the difference between jackshaft, driveshaft, dead axle. Can we employ a dead axle with chain drive for transmission?
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Post Options Post Options   Thanks (1) Thanks(1)   Quote sandres913 Quote  Post ReplyReply Direct Link To This Post Posted: Aug/14/2012 at 9:08am
A dead axle isn't connected to any part of the transmission. It rotates freely and is used to increase the load capacity on dump trucks. Can't recommend using that here.

A jackshaft and a driveshaft (or prop shaft) can be the same thing. Think of in a RWD car, the driveshaft connects the transmission to the differential.

If this doesn't answer your question, I suggest some searching and/or reading this: http://en.wikipedia.org/wiki/Drive_shaft
Shaun
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Legendkaran View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Legendkaran Quote  Post ReplyReply Direct Link To This Post Posted: Aug/14/2012 at 10:53am
so can you kindly let me know if swingarm suspension can be used according to the baja 2013 rule book. the rule given in the rule book is as follows:
"The brake(s) on the driven axle must operate through the final drive. Inboard braking through universal joints is permitted.
Braking on a jackshaft or through an intermediate reduction stage is prohibited"
1. Can you please explain what exactly is a jack shaft?
2. What does the above mentioned rule exactly convey?
3. Can we use a braking system consisting of solid axle which is powered      by a chain drive mechanism from the engine?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote sandres913 Quote  Post ReplyReply Direct Link To This Post Posted: Aug/14/2012 at 11:02am
Basically, they don't want you to install a brake on the engine output shaft, inside a transmission, or between the transmission and differential (if present). The only places a brake is permitted is on the final drive, i.e. outboard (mounted at the wheels) or, if you're using a solid axle (no differential), then you can install it on that solid axle.
Shaun
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Legendkaran Quote  Post ReplyReply Direct Link To This Post Posted: Aug/14/2012 at 11:22am
Thank you so much shaun!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote zglazer Quote  Post ReplyReply Direct Link To This Post Posted: Aug/14/2012 at 5:13pm
The final drive is everything that rotates at the same speed as the wheels. That means you can install a brake anywhere after your final reduction stage.
Zack Glazer
McGill Baja Racing Alumnus 2009-2013 http://baja.mcgilleus.ca/
2012-2013 Drivetrain Designer
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Legendkaran Quote  Post ReplyReply Direct Link To This Post Posted: Aug/15/2012 at 2:26am
thank you for the info Zack :-)
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Post Options Post Options   Thanks (0) Thanks(0)   Quote shaggy_ss Quote  Post ReplyReply Direct Link To This Post Posted: Sep/05/2015 at 10:47am
is Inboard braking system preferable over outboard ? 
I have read the pros and cons of it but i am confused whether it would be useful or not... 
what do you'll use?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote frinesi2 Quote  Post ReplyReply Direct Link To This Post Posted: Sep/05/2015 at 1:04pm
Inboard braking means less un-sprung mass, and the possibility of using one rotor and caliper if you're using a spool and you can achieve sufficient braking force that way. Brake line routing can be easier as well. Typically, however, an inboard brake has to be smaller in diameter, otherwise, depending on the position of your output shaft, your rotor will extend below your frame, which could be bad. If you're using CV-joints, the rear wheels won't stop or start moving until all of the play in the splines has been taken up, meaning a delay in braking or acceleration and maybe higher shock loads on your drivetrain splines.

Outboard braking can allow you to use two larger rotors which means much higher braking force. depending on how much room you have in your rims. That might allow you to launch the car at a higher engine RPM in acceleration before you overcome the rear brake's holding power. Any play in the drivetrain will be taken up before you release the brakes which could mean quicker acceleration. Also more braking power means easier wheel-lock during the brake check.  And maybe easier induced oversteer. It also means, however, higher un-sprung mass and the need for flexing brake lines which have to be protected from anything the suspension might hit.

I've used both methods on different cars.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote shaggy_ss Quote  Post ReplyReply Direct Link To This Post Posted: Sep/05/2015 at 1:46pm
which one would you prefer ?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote drvr5 Quote  Post ReplyReply Direct Link To This Post Posted: Sep/05/2015 at 7:50pm
The one that fits your goals better. Neither is better, and many teams have run each successfully. If it isn't obvious which one you should run, you haven't analyzed your car enough.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Xtark Quote  Post ReplyReply Direct Link To This Post Posted: Jun/07/2017 at 1:32pm
Can I mount disk mount on the drive shaft coming from the gearbox for inboard braking?
Will it violate the rule of  "The brake(s) on the driven axle must operate through the final drive?"
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Post Options Post Options   Thanks (0) Thanks(0)   Quote sujandinesh Quote  Post ReplyReply Direct Link To This Post Posted: Jun/08/2017 at 4:01am
Is the drive shaft coming from your gearbox your final drive? 
Yes? Then it does not violate the rule. 
No? Then you need to look for the drive shaft that is your final drive and mount your rotor on that. 
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