Hi!

Last week I had an idea of a remote controlled gearbox, which is enough compact for vehicles and has definite control:

The special part is the controller, this allows the shifting from 1 to 4 with one hand. You can shift very easily by using this positions:

Neutral/start:

Then 1-2-3-4 gear:

This gearbox sustains high torque too, there weren't any scratches when I tested with XL motor. I was thinking about a gearbox like this since long ago, to have something with four speed to build in my mocs. You don't have to know which gear is momently engaged(like in case of steppers), just select the gear you want. It can shift from any gear to any other one, doesn't matter which is the current gear.

The pictures show everything about the construction and working method. Two gearbox are combined:

Of cousre, the controller motors can be placed in many other way, this is just a quick solution for working.

The ratios are:

first gear: 5:1 reduction

second gear: 3:1 reduction

third gear: 1,666: 1 reduction

fourth gear: 1:1 (no reduction)

--> so it's the same as the popular four speed gearbox.

Folder: http://www.brickshel...ry.cgi?f=518300

This video shows the working, and the shifting times(about 4 sec from 1 to 4) can be also seen:

Edited December 15, 201212 yr by Mbmc

Cool!

Nice solution for the remote as well, very clever

Very cool idea.

Now you need to see if you can implement it in a moc.

Is there any particular reason or advantage to use clutch gears in one gear box and the rack and sliding axle in the other gear box?

Thanks all.

Now you need to see if you can implement it in a moc.

I think it doesn't need a lot of imagination to implement it in a moc. Anyway it's already built in to a truck I'm working on now, and performs well even under 2 kilogramm of weight(load) in the rear axle.

Is there any particular reason or advantage to use clutch gears in one gear box and the rack and sliding axle in the other gear box?

Yes, of course, two of the sliding axle gearbox would be very long. Two of the clutch gear gearbox wouldn't allow to make the current gear ratios(5,3,1.666,1), so this combination is the best compromiss I found. The efficiency is very important for me, in this gearbox there is only two gears in every speed, this is the minimum in a four speed gearbox, which is able to control with simple PF RC. There would be possible to make it shorter without the sliding axle part, and using only clutch gears in shifting, but that wouldn't be so strong and efficient(at least one more gear would be necessary) as now.

Feel free to try it out.

Edited December 16, 201212 yr by Mbmc

Thank you, now is design completely clear to me.

Well done, looking forward to see it in some vehicle.

Yesterday I found an another solution to control the gearbox:

The picture tells everything, I think with this the control is easier and a bit faster, but needs two of the remote controller.

What do you think?

An example of mounting this gearbox into a moc:

http://www.eurobricks.com/forum/index.php?showtopic=80713

I get some request to make instructions, so I made it in LDD:

http://www.brickshelf.com/cgi-bin/gallery.cgi?f=551597

www.brickshelf.com/gallery/mbmc137/Ideas-Technologies/DefiniteGearbox/Instructions/gearboxv3-instructions.lxf

The pictures in the folder show everything, but if you have questions, feel free to ask here.

Important: the placing of gearbox operator motors is just an example.

An example of mounting this gearbox into a moc:

http://www.eurobricks.com/forum/index.php?showtopic=80713

I get some request to make instructions, so I made it in LDD:

http://www.brickshelf.com/cgi-bin/gallery.cgi?f=551597

www.brickshelf.com/gallery/mbmc137/Ideas-Technologies/DefiniteGearbox/Instructions/gearboxv3-instructions.lxf

The pictures in the folder show everything, but if you have questions, feel free to ask here.

Important: the placing of gearbox operator motors is just an example.

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