4 simple manual 4-speed gearboxes with centered input/output

[Didumos69]

I took the time to make instructions for a gearbox concept I had laying around. 4 variations on the same concept, a gear layout I have not yet seen somewhere else.

One of the main objectives: Clutch gears are only used for engaging with driving rings, not for transferring drive over axles running at different speed, which is a common source of friction.

Ratios:

1. 0.33
2. 0.50
3. 0.67
4. 1.00

Centered heavy-duty manual 4-speed gearbox - Rear input (instructions on Rebrickable):

Centered heavy-duty manual 4-speed gearbox - Front input (instructions on Rebrickable):

Centered heavy-duty manual AWD 4-speed gearbox - Rear input (instructions on Rebrickable):

Centered heavy-duty manual AWD 4-speed gearbox - Front input (instructions on Rebrickable):

Edited May 27, 2021 by Didumos69

[gyenesvi]

Nice clean and compact design, especially the one with the differential, I like how symmetric it is. Do I understand correctly that in the one with the differential, the role of the red driving ring and the grey extension ring is just to permanently connect the differential with the blue gear (basically extending the differential)? Those are old pieces from the studful era, right?

Another thing I noticed is that the gear stick when in its leftmost or rightmost position, does not arrive exactly above the main driving rings (there's a half stud offset, right?). Can't that result in missed engagement, if you know what I mean? (can't find better words)

[Didumos69]

  On 5/27/2021 at 6:39 PM, gyenesvi said:

Nice clean and compact design, especially the one with the differential, I like how symmetric it is. Do I understand correctly that in the one with the differential, the role of the red driving ring and the grey extension ring is just to permanently connect the differential with the blue gear (basically extending the differential)? Those are old pieces from the studful era, right?

Another thing I noticed is that the gear stick when in its leftmost or rightmost position, does not arrive exactly above the main driving rings (there's a half stud offset, right?). Can't that result in missed engagement, if you know what I mean? (can't find better words)

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Thanks for your comment!

Your understandings are correct. The red driving ring and lbg extension are indeed older pieces, I wouldn't say from the studful era though. They have been produced until 2014. The changeover catch is indeed half a stud off, but it never fails.

[gyenesvi]

  On 5/27/2021 at 6:54 PM, Didumos69 said:

I wouldn't say from the studful era though. They have been produced until 2014.

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I didn’t know that, I only had them in an old studful set, and assumed their length is designed for studful builds (even lengths), I have never used them in modern builds, nice usage though.

  52 minutes ago, Didumos69 said:

The changeover catch is indeed half a stud off, but it never fails.

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Thanks, that’s great!

[SNIPE]

You can swap the 2L clutch ring and extention ring with a 3L clutch ring right?

[Didumos69]

  On 5/27/2021 at 10:09 PM, SNIPE said:

You can swap the 2L clutch ring and extention ring with a 3L clutch ring right?

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It could, but it will give much more play, with chances of a slipping driving ring, see image (courtesy of @Attika).

[SNIPE]

  On 5/28/2021 at 6:26 AM, Didumos69 said:

It could, but it will give much more play, with chances of a slipping driving ring, see image (courtesy of @Attika).

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Ah ok, interesting.