I like how they start ghost riding the whip at 8:45 https://www.youtube.com/watch?v=K4JhruinbWc#t=519
How a differential gear works (1937) [video]
41–50 of 59 posts
Re: How a differential gear works (1937) [video]
#42If you like videos like this, check out Retrotechtacular on Hackaday. They have a series on mechanical firing computers on navy ship that is nothing short of mech-eng porn, and I mean the classy kind.
I watched that whole series a year ago and was fascinated. I believe it has been posted here before but it's worth repeating.
Re: How a differential gear works (1937) [video]
#43I remember building lego cars which had a differential: http://groups.csail.mit.edu/drl/courses/cs54-2001s/images/le...
Re: How a differential gear works (1937) [video]
#44some may also enjoy a 3d-printed triple gear https://www.youtube.com/watch?v=I9IBQVHFeQs
Does this have any possible practical applications? Or is it just cool?
Re: How a differential gear works (1937) [video]
#45@edferda: props for posting this; the pedagogy here is just terrific!
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Re: How a differential gear works (1937) [video]
#46Nice to follow that with this short video illustrating how one type of locking differential works to eliminate some of the disadvantages of an open differential. https://www.youtube.com/watch?v=MCxqUJCZGNU
So, one wheel starts spinning, and then, at a certain speed, it gets immediately locked into the other wheel which isn't moving at all? How does that not blow up the entire differential?
Re: How a differential gear works (1937) [video]
#47I remember reading through David Macaulay's “The Way Things Work” as a kid, soaking up the illustrations until I understood each one. It was life-changing. However, I remember having trouble with one page in particular -- the one describing differential gears. Of course, video would probably have helped a lot :)
Re: How a differential gear works (1937) [video]
#48Nice to follow that with this short video illustrating how one type of locking differential works to eliminate some of the disadvantages of an open differential. https://www.youtube.com/watch?v=MCxqUJCZGNU
So, one wheel starts spinning, and then, at a certain speed, it gets immediately locked into the other wheel which isn't moving at all? How does that not blow up the entire differential?
For manually operated lockers the axle shafts have to be moving at the same speed or with very little difference in speed to be engaged.
>Only engage the Eaton ELocker™ differential while the vehicle is stationary or operating at speeds of 3 mph or less with minimal wheel slippage.
This specific locker (Eaton G80) is self-engaging up to a set speed which is intended to prevent this from happening, though it has been known to occur.
>The G80 can be very effective when used within its limitations. However its very design can lead it to failure. It requires a certain amount of speed difference between both rear wheels to operate. Basically more slip than you would ever encounter going around a turn, but it will not lock at speeds above roughly 20-30mph. This it where it earned the name "gov-lock". It has a speed governor that operates off centrifugal force inside to govern locking.
When it locks, it locks hard. Imagine one tire sitting still, and suddenly being launched to a speed of 20-25mph. That takes a great deal of force and puts a lot of strain on internals. They have a tendency to break with no warning.
Page also has photos of one that has failed.
http://www.ar15.com/forums/t_1_134/1250761_g80_differential_...
Re: How a differential gear works (1937) [video]
#49This is the best technical education video I've ever seen. If all information were available in such an easy to understand form, the world would be full of geniuses.
The level of effort is astounding. The "support" part holding the spokes looks cast. They couldn't have possibly cast that part specifically for this video... could they?
Re: How a differential gear works (1937) [video]
#50Nice to follow that with this short video illustrating how one type of locking differential works to eliminate some of the disadvantages of an open differential. https://www.youtube.com/watch?v=MCxqUJCZGNU
So, one wheel starts spinning, and then, at a certain speed, it gets immediately locked into the other wheel which isn't moving at all? How does that not blow up the entire differential?
With a hard-locking differential ("lockers", generally used off-road), engagement while one wheel is spinning is ill-advised. They're generally toggled on at low/zero speed by the operator in anticipation of a traction-loss situation.
The variety of differential which does not immediately lock one wheel into another is http://en.wikipedia.org/wiki/Limited-slip_differential .