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Jeep-Short Wheelbase All discussion of short wheelbase Jeeps: CJ, TJ, YJ and JK

 
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post #1 of (permalink) Old 05-11-2005, 04:02 AM Thread Starter
 
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Your mission should you choose to accept it...

Is to explain to me in words of no more then one sylable how an automatic locker functions.

I've been trying to wrap my head around this for ages. Literally... ages. I've almost got it, but there's a question that no one seems to be able to answer.

These pictures helped me a bunch... so
The parts.. very simple.. right?


assembled out of the carrier. looks simple right?


the central guts.


Now.. when the locker sits in the carrier, in ones driveway, the 4 springs and pins inside it push the inner disks out, locking them in the teeth of the outer rings. The inner rings them bind on the center pin, and the carrier is locked.

The rings picture in the first picture hold the two "side" disks against the outside of the carrier so they don't move in or float around.. but allow the inner disks to slide in and out.

NOW.. someone PLEASE explain what forces/device force the center disks together to unlock the differential.

Am I missing something? or is this like voodoo?
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post #2 of (permalink) Old 05-11-2005, 06:55 AM
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Re: Your mission should you choose to accept it...

The lack of power imput alows the locker to slip. Input power from the drive shaft and it locks up. Was that simple enough??
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post #3 of (permalink) Old 05-11-2005, 08:36 AM
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Re: Your mission should you choose to accept it...

The taper of the interlocking gears allows them to slip when there is sufficient traction (ie on pavement). In a low traction situation such as dirt, there isn't enough force to push the gears over each other, so it stays locked.

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post #4 of (permalink) Old 05-11-2005, 08:39 AM
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Re: Your mission should you choose to accept it...

Smoke and mirrors!
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post #5 of (permalink) Old 05-11-2005, 09:00 AM
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Re: Your mission should you choose to accept it...

Maybe a different picture will help....



Click on the picture for more.

[img]/ubbthreads/images/graemlins/40BEER.gif[/img]
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post #6 of (permalink) Old 05-11-2005, 09:03 AM
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Re: Your mission should you choose to accept it...

If you look where the pinion shaft goes between the two inner drive plates, that hole is not round like the pinion shaft but elongated. When power is applied through the axle, the pinion shaft wedges the two inner drive plates apart and into the driven plates.

When you turn a corner, the outside wheel/axle/driven plate spin faster then the inner one. The inner one still has the pinion pressure forcing the drive plate into the driven plate. But the outer wheel's plates move to where the inner plate's notch is centered on the pinion. When it is centered, it can moved inward allowing the two halves of the outer wheel's locker to ratchet past each other.
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post #7 of (permalink) Old 05-11-2005, 01:24 PM Thread Starter
 
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Re: Your mission should you choose to accept it...

Will, you're explanation is the most sense making. [img]/ubbthreads/images/graemlins/grin.gif[/img]

But... does anyone know what force causes the "outer wheels inner plate to move inward allowing the two halves of the outer wheel to ratchet?

(Edit: Because in theory the springs should still be pushing the two halves together, even when the inner plates are centered on the shaft?)


I think I'm just going to sign onto the VooDoo/Smoke and Mirrors theory. [img]/ubbthreads/images/graemlins/grin.gif[/img]
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post #8 of (permalink) Old 05-11-2005, 01:39 PM Thread Starter
 
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Re: Your mission should you choose to accept it...

Oh snap.

This just came to me. I hope I've got this right.

The springs in the locker aren't enough to force the geared potions together and hold them there when the locker is trying to ratchet. It needs the pin in the center to jam the two halfs appart.

As per extinctjeeps blurb.. when the locker is engaged but only wtih the springs and not the center pin, the teeth are shaped in such a way that they can run past one another.


So.

Did I get it'?
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post #9 of (permalink) Old 05-11-2005, 02:27 PM
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Re: Your mission should you choose to accept it...

Yup, you got it now.
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