Looked up how automatic transmissions work

"bob and john" (bobandjohn) 01/28/2016 at 18:17 • Filed to: None

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TL;DR: magic

TheHondaBro > bob and john 01/28/2016 at 18:22

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Dat FWD Z4.

bob and john > TheHondaBro 01/28/2016 at 18:23

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I laughed pretty hard at that too, not gunna lie.

shop-teacher > bob and john 01/28/2016 at 18:24

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Definitely magic.

Saracen > bob and john 01/28/2016 at 18:25

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Logansteno: Bought a VW? > bob and john 01/28/2016 at 18:31

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Can confirm, lots of black magic

Eberle-Hills-Cop > bob and john 01/28/2016 at 18:31

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I’m going to throw up.

Cé hé sin > bob and john 01/28/2016 at 18:31

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Don’t bother looking up something like that. Automatic boxes were not designed by any human agency.

Just as an example, ZF had a six speed which used four sets of gears. They then designed an eight speed, still with the same four gears. Merc have a nine speed. Still four gears. Ford are designing a ten speed. Yes, four gear trains.

gin-san - shitpost specialist > bob and john 01/28/2016 at 18:36

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I clicked play on the video and realized that I’m okay with the “magic” explanation. It’s just different magicks for different gearboxes, i.e. the 4-speed auto (4th gear is an overdrive gear) in my car is like first-year Hogwarts magic, and modern ZF boxes are like magicks done by Aurors who aced their OWLs. A range of magic, but magic nonetheless.

bob and john > gin-san - shitpost specialist 01/28/2016 at 18:37

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i KINDA get it, but i would need to watch the video several times over to understand how the power flow through which gears.

bob and john > Cé hé sin 01/28/2016 at 18:39

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I get manuals no problem .dual clutchs, somewhat. autos are the only one i had NO idea how they work. Still need to watch it again 2 or three tims to get the power flow

Kailand09 > bob and john 01/28/2016 at 18:45

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Thanks for the share. Never bothered to look this up as I’m not as curious on autos, but now looking at it, I find it highly interesting.

I work with gearing quite a bit in my job, maybe I should look into transmission engineering. It’s very intriguing.

I’ve never thought about the reverse, though that makes total sense.

The Compromiser > bob and john 01/28/2016 at 18:47

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I should know. I now have three of them. ..

The Compromiser > bob and john 01/28/2016 at 18:47

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I make transmission parts and still have no idea...

bob and john > The Compromiser 01/28/2016 at 18:49

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dam it man.

BTW, hows the weather down south treating you?

Leon711 > bob and john 01/28/2016 at 18:51

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now look at dual clutch gearboxes

The Compromiser > bob and john 01/28/2016 at 18:53

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Like it’s bitch. Not too cold but metric shittonnes of snow. It rained yesterday and now it’s snowing again. I need some two wheels good time or the family might die... (jk).

bob and john > Leon711 01/28/2016 at 19:02

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DCTs i get (the concept at least. i still find it amazing how they pack 2 sets of gears into 1 box) it was autos i didnt get at all

The Opponaut formerly known as MattP123 > bob and john 01/28/2016 at 19:09

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And how the hell does an old hydraulically controlled auto know when to change gears?

The Opponaut formerly known as MattP123 > bob and john 01/28/2016 at 19:11

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Hondabro?

If only EssExTee could be so grossly incandescent > bob and john 01/28/2016 at 20:09

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that is one tiny-ass engine.

If only EssExTee could be so grossly incandescent > bob and john 01/28/2016 at 20:14

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Here is an awesome explainer of how the torque converter works:

A bit dry at first but it’ll make you completely understand everything if you stick with it.

bob and john > If only EssExTee could be so grossly incandescent 01/28/2016 at 20:17

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i get how the TC works. it was the trans itself i was curious on.

If only EssExTee could be so grossly incandescent > bob and john 01/28/2016 at 20:26

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So complicated that the US army needed two fifteen-minute videos to explain it. That bit about having two inputs is fascinating, it’s like turning a planetary gear into a CVT.

Amoore100 > TheHondaBro 01/28/2016 at 20:44

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With a very, very tiny engine. 0.3 liter?

Jake - Has Bad Luck So You Don't Have To > bob and john 01/28/2016 at 20:48

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Holy fuck that’s awesome. This explains so much of what I was seeing when a coworker was servicing an automatic trans earlier today.

Cé hé sin > bob and john 01/29/2016 at 04:45

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I can understand a three speed. Two gear trains, one provides a low gear. The second gearset speeds up the low gear to give second gear. Lock them together and you get a direct top gear. Take drive from another part of one of them and you get reverse.

It’s only when you go above three gears that elves and witchcraft become involved.

You can buy a Roloff hub gear for your pushbike that’s like one of those old Sturmey Archer gears on steroids and provides 14 speeds from three gear trains.