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Old 05-10-2012, 06:00 PM   #1
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Differtionals Explained ( Even I understood this!!)

Was watching the 4wd explained movie posted in the FAQ section, and it reminded me of a video I watched sometime ago.

They explain super clearly using clear cut, non CGI'd models to explain how differential gears work. I thought it would be a helpful friendly first post

Hope it helps!!




***NOTE*** Id skip to 1:50 to get right to the explanation.

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Old 05-10-2012, 06:17 PM   #2
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that was pretty cool.

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Old 05-10-2012, 06:17 PM   #3
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wow. that was great.
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Old 05-10-2012, 06:43 PM   #4
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really neat!
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Old 05-10-2012, 07:06 PM   #5
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Thanks for sharing!
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Old 05-10-2012, 07:15 PM   #6
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Best 9 minutes of my life!
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Old 05-10-2012, 07:17 PM   #7
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awesome
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Old 05-10-2012, 09:27 PM   #8
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great find!
i love those old newsreels
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Old 05-10-2012, 10:26 PM   #9
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I remember watching that vid awhile ago.....best example of an open diff I've ever seen.
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Old 05-11-2012, 04:25 AM   #10
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COOoooooooooL
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Old 05-11-2012, 05:20 AM   #11
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That's a great demo/explanation. I did think the low-speed motorcycle routine at the beginning went on about 2 minutes too long, unless the viewer really has some extra time to spare.
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Old 05-11-2012, 05:43 AM   #12
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very nice
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Old 05-14-2012, 08:04 AM   #13
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This is a great educational video. I had a loose understanding of what the differential did, but this really helped hammer many points home. I now have a better understanding of the conditions why one wheel would not spin, while another would (that always seemed to evade me).

But the bigger thing that this helped me to understand was why not to drive our part-time 4WD system on dry pavement.

As I knew the front/rear axle differentials allowed the driver/passenger- side wheels turn independently, I never understood why 4WD changed it.

As a result of this video, I realized that if I look at the drive shafts as axles, engaging the 4WD system effectively locks them together, thus creating the situation a differential was designed to alleviate.

Ah-ha! A center differential is required to allow the front and rear drive shafts to spin at different speeds.
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Old 05-14-2012, 09:10 AM   #14
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Quote:
Originally Posted by angrymonkey View Post
Best 9 minutes of my life!
You need to get out more.
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Old 05-14-2012, 09:27 AM   #15
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Yes, it's a good basic video, but it's hopelessly outdated and does not cover different types of differentials that are common in 4WD vehicles:

- different types of limited-slip differentials (LSD)

- locking differentials

and most importantly,

- torque sensing / distributing differentials (Torsen).

Torsen distributing differentials are very important because they can distribute torque unevenly between axes / wheels as necessary, and do it instantly, without wheel slippage, like electronic systems do.
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Old 05-14-2012, 09:58 AM   #16
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Thanks for sharing. I remember building some type of a differential out of tinker toys when I was little and this brought back those long lost memories.

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