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Team 192's 2013 Gearbox

Joey Milia

By: Joey Milia
New: 23-02-2013 22:32
Updated: 23-02-2013 22:32
Views: 3592 times


Team 192's 2013 Gearbox

2013 Drive Gearbox for a WCD
Gear from WCP, Vex, and Martin Gear
Belt and Sprockets from SDP-SI

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23-02-2013 22:40



Unread Re: pic: Team 192's 2013 Gearbox

I was waiting to see this. Always love 192's gearboxes. Can't wait to see this things in-person at SVR.

Just curious - why the tiny output shaft? That looks like it could barely hold a sprocket.



23-02-2013 22:47

Steven Donow


Unread Re: pic: Team 192's 2013 Gearbox

Wow. That's absolutely beautiful. I assume you're using bevel gears?



23-02-2013 22:50

Nuttyman54


Unread Re: pic: Team 192's 2013 Gearbox

I do love that black and red...looks real sharp

Quote:
Originally Posted by Andrew Lawrence View Post
Just curious - why the tiny output shaft? That looks like it could barely hold a sprocket.
If I had to guess, I'd say they're doing something similar to 971's setup last year and putting the last stage of the gearbox on the output shaft and a dead axle wheel.



23-02-2013 22:59



Unread Re: pic: Team 192's 2013 Gearbox

Quote:
Originally Posted by Nuttyman54 View Post
I do love that black and red...looks real sharp



If I had to guess, I'd say they're doing something similar to 971's setup last year and putting the last stage of the gearbox on the output shaft and a dead axle wheel.
Ah, that makes a lot more sense.



23-02-2013 23:07

pmangels17


Unread Re: pic: Team 192's 2013 Gearbox

Is it a worm drive inside or plain bevel gears?



23-02-2013 23:12

Joey Milia


Unread Re: pic: Team 192's 2013 Gearbox

Quote:
Originally Posted by Andrew Lawrence View Post
Just curious - why the tiny output shaft? That looks like it could barely hold a sprocket.
One of the goals of the gearbox was to reduce it's footprint, and that includes the space it takes to install and remove it. To that extent the output shaft is split into two parts, half in the gearbox, other half in the sprocket and wheel. This allows the gearbox to be removed after pulling it only 5/8 of in inch into the robot, instead of the 2-3 inches that would be required otherwise.

More specs,
two speed shifting 17fps and 6fps
Cim to cluster shaft is 3mm GT2 Belt

and yes, there is a bevel gear in there.



24-02-2013 01:52

DampRobot


Unread Re: pic: Team 192's 2013 Gearbox

Just wondering, do you have any idea about the gearbox's efficiency? Just looking at all those shafts makes me wonder if you're loosing some power through all those reductions.

But seriously, that looks like a marvel of smart design and good machining. So many bends and bearing holes, all lining up perfectly...



25-02-2013 21:42

Joey Milia


Unread Re: pic: Team 192's 2013 Gearbox

Quote:
Originally Posted by DampRobot View Post
Just wondering, do you have any idea about the gearbox's efficiency? Just looking at all those shafts makes me wonder if you're loosing some power through all those reductions.
I don't have any hard data on efficiency but it's just a three stage shifting gearbox, one of which is belts from the cims. All stages are in the 98%-99% range, add on the sealed bearings and I would expect an efficiency in the low 90s.



25-02-2013 22:43

sdcantrell56


Unread Re: pic: Team 192's 2013 Gearbox

Quote:
Originally Posted by Joey Milia View Post
I don't have any hard data on efficiency but it's just a three stage shifting gearbox, one of which is belts from the cims. All stages are in the 98%-99% range, add on the sealed bearings and I would expect an efficiency in the low 90s.
How are you getting such high efficiency per stage?



25-02-2013 22:56

Joey Milia


Unread Re: pic: Team 192's 2013 Gearbox

The main reductions are spur and bevel gears, which, when alined properly with accurate tooth profiles and proper lubrication are extremely efficient. Once again I have no measured data to support these estimates, they are based on subjective observations and engineering manuals (mostly engineering manuals).



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