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 Selectable locker idea

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moparjim
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PostSubject: Selectable locker idea   Wed Feb 01, 2017 10:06 am

I've seen threads about selectable lockers on here and talk about limited slip diffs for transaxles. I believe I've thought of the easiest way to make a selectable locker for a transaxle. It could probably use some refining and a way to make it lower profile, but I don't see how it couldn't work. Sorry for the crude drawing, but it is a quick sketch here at work. The hardest part would be designing the locking mechanism between the two shafts.
As I loaded the picture, I thought if there was a way to make a tube with brass sleeves instead of the pillow blocks, that could make it a little more compact.

Let me know what you guys think.
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CraftsmanQuad19
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PostSubject: Re: Selectable locker idea   Wed Feb 01, 2017 10:46 am

So it would be like an external locker? Thinking outside the box are we? lol! I like it
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moparjim
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PostSubject: Re: Selectable locker idea   Wed Feb 01, 2017 10:56 am

Yes, I got to thinking it would be the easiest route for a true selectable locker. The best thing, it leaves the internals of the trans stock, which helps durability. And, is completely bolt on (in theory) so minimal modifications/machining necessary to make it install on the trans. In theory, it could be made for almost any trans made for tractors. The person would have to notch the frame for the locker axle to clear but other than that, piece of cake.
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sadeoo7
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PostSubject: Re: Selectable locker idea   Wed Feb 01, 2017 10:57 am

i was thincking about something similar but using an electric clutch so i could just flip a switch to lock the rear.
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moparjim
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PostSubject: Re: Selectable locker idea   Wed Feb 01, 2017 11:00 am

I figured this idea could use a posi lock cable like for a pto. One you would pull out and turn 90* to lock the cable in place. just as easy imo.
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moparjim
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PostSubject: Re: Selectable locker idea   Wed Feb 01, 2017 11:13 am

This is what I envisioned using for the coupler. One side would be fixed solid, the other side would slide side to side to engage and disengage. There would be some rotational slop between the two, but it wouldn't be much. There would also be a spring on the end of the cable so it could be engage on the go, and make it easier for it to engage. The only thing for the design using these is you would have to have someone with a lathe cut a groove in the sliding side so a "shift fork" could be made to slide the coupler sleeve in and out of engagement.
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CraftsmanQuad19
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PostSubject: Re: Selectable locker idea   Wed Feb 01, 2017 11:14 am

What if you were to mount the locker shaft to the frame itself instead of the trans. Just put the pillow bearings in the vertical plates in the chassis and run your shaft through
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moparjim
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PostSubject: Re: Selectable locker idea   Wed Feb 01, 2017 11:22 am

That would work as well also. I didn't think of that at first, but now that you mentioned it, it would work better. It could truly be a universal system then, regardless of what trans you have. You could have anything from a hydro to even a foote or spicer trans. The locker shaft would be made from a 1" gokart axle for strength so it would take all the torsional load off the ttrans and in theory make the trans last longer. Good idea bud. The only other thing I would add would be some sort of chain guard or cover, since there would be a lot of mud/dirt/debris thrown around that could jam up the chains.
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CraftsmanQuad19
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PostSubject: Re: Selectable locker idea   Wed Feb 01, 2017 11:41 am

I think if you were to put a chain guard, it would collect mud and jam it up. Leaving it open will be like an atv, the mud can hit it, but to wont stay on it long
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moparjim
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PostSubject: Re: Selectable locker idea   Wed Feb 01, 2017 12:17 pm

True, I guess you could just use the o-ring chain the quads use and basically forget about it. I'm pretty amped up about this now, I might build something for the buildoff just featuring this as the main idea. Credit would be given where its due of course to the design changes from CraftsmanQuad. Just so happens that the Ford I'm building for my buddy is the perfect candidate for this feature.
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PostSubject: Re: Selectable locker idea   Wed Feb 01, 2017 1:08 pm

Glad I could be of assistance Wink

The plan will probably change more down the road too as it is applied. How strong would that shaft have to be anyway? It wouldn't necessarily need to be welded, so could it be just some round stock? There wont be any load on it like an axle, it will be more like a jackshaft, so purely rotational load (torsion?).
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moparjim
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PostSubject: Re: Selectable locker idea   Wed Feb 01, 2017 1:28 pm

Well, I was planning on using a basic 1" gokart axle for cheapness, simplicity, and strength. It's a more common size, will hold up great, and will hold up better being 2 pieces. It'll be overkill for the 3/4" axle transmissions, but at the same time, work fine for the 820's, 633's, and 2300's. I guess there would be an application for the 3/4" sized setup, and I suppose it would hold up ok being a shorter shaft, but I like to err on the side of being overbuilt. The biggest variable would be chain length, due to different mounting locations on the different types of frames on tractors, and how it could be actuated. It could be either cable or lever depending on how much room you have and your personal preference. (I personally like the cable idea). I was going to design it on a plate so it would be easier to mount and less chance of installation error. Also, it would eliminate the possibility of misalignment of the engagement rod.

Just had another brainstorm.... What if it was made to default on? In other words, if something failed with the engagement method, it would automatically engage as a "protection" measure. So, when its disengaged, it would be holding itself out under spring tension.
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CraftsmanQuad19
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PostSubject: Re: Selectable locker idea   Wed Feb 01, 2017 2:15 pm

That could work. i would do a manual lever that actuated it and had a lock on it like a raise/lower lever
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moparjim
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PostSubject: Re: Selectable locker idea   Wed Feb 01, 2017 3:13 pm

I'll keep posting up on this, it will be getting built. I'll try to get a better picture of how it will be set up.
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TheBeal
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PostSubject: Re: Selectable locker idea   Mon Feb 06, 2017 4:45 pm

This may be of some interest for your idea...
2-speed gearbox

Splined shaft would be good.
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