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-   -   pic: Team 192's 2013 Gearbox (http://www.chiefdelphi.com/forums/showthread.php?t=114280)

Joey Milia 23-02-2013 22:39

pic: Team 192's 2013 Gearbox
 

Andrew Lawrence 23-02-2013 22:40

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.

Steven Donow 23-02-2013 22:47

Re: pic: Team 192's 2013 Gearbox
 
Wow. That's absolutely beautiful. I assume you're using bevel gears?

Nuttyman54 23-02-2013 22:50

Re: pic: Team 192's 2013 Gearbox
 
I do love that black and red...looks real sharp

Quote:

Originally Posted by Andrew Lawrence (Post 1239451)
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.

Andrew Lawrence 23-02-2013 22:59

Re: pic: Team 192's 2013 Gearbox
 
Quote:

Originally Posted by Nuttyman54 (Post 1239458)
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.

pmangels17 23-02-2013 23:07

Re: pic: Team 192's 2013 Gearbox
 
Is it a worm drive inside or plain bevel gears?

Joey Milia 23-02-2013 23:12

Re: pic: Team 192's 2013 Gearbox
 
Quote:

Originally Posted by Andrew Lawrence (Post 1239451)
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.

DampRobot 24-02-2013 01:52

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...

Joey Milia 25-02-2013 21:42

Re: pic: Team 192's 2013 Gearbox
 
Quote:

Originally Posted by DampRobot (Post 1239518)
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.

sdcantrell56 25-02-2013 22:43

Re: pic: Team 192's 2013 Gearbox
 
Quote:

Originally Posted by Joey Milia (Post 1240412)
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?

Joey Milia 25-02-2013 22:56

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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