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7-speed compact gearbox
Today I would like to present a 7-speed + reverse gearbox of my design. I think that some of the solutions used in its construction, are rather unique and others can actually find them useful. Never the less I do hope you'll enjoy visiting this MOC's page. Do leave a comment, and do not hesitate to ask questions.
About this creation
Here are some photos of the creation. Do excuse the quality of some of them, since they were made with an cell phone camera only.

Important!
To make things easier to describe I've given the axles some numbers:

No.1 - Right main axle - can be destinguished by the RED driving ring
No.2 - Center-right main axle - next to the above
No.3 - Center-left main axle - next to the above
No.4 - Left main axle - next to the above
No.5 - Minor axle - first axle placed below all of the above
No.6 - Driving axle - first from the bottom

A look at the front. As you probably already noticed on the main photo, the four axles that hold the transmission driving rings are in this case NOT placed linearly. The gearbox was constructed like that, since I wanted the transmission changeover catch to move along a curve, rather than a line like in most of the designs that I've seen so far. It makes the actual gear change more user friendly and realistic.

A look at the back. This photo makes it clear that the sprockets placed on the four main axles are located at both ends of the gearbox. The ratio is created at the front between axles 1-2; 3-4, and at the back between axles 2-3. Of course they can be placed anywhere you like, but I've noticed that such a placement ensures a smooth work of the gearbox mechanics.

A look at the bottom. Another interesting solution can be seen on this photo. The driving axle (6) is not parallel to the other axles. It's moved aside by 0.5 stud on a length of 7 studs. The cardan axle guarantees that it spins with no greater friction. Such a construction was needed in order for the driving axle sprockets (double 24) to touch all the other sprockets that I wanted it to touch and to avoid touching those that I didnt want it to touch :)

A look at the top. Just like in the previous photo here you can actually see my finger... And all of the driving rings.








Below you can see positions of the shift knob, depending on the gears which we choose( starting from the left: position at R and 1st; 2nd and 3rd; 4th and 5th; 6th and 7th):


Here's a nice close up at the front sprockets, center sprockets, and the changeover system once again:











And a look at each side:











The engine axle can be linked to either of the center axles providing it with different gear ratios.







___________________________________________________

A building instruction was made by Josh Lucas and can be found HERE. Please note that the 6th axle there is parallell to the rest, unlike on the photos You can see here. This way the gearbox also works, but is not as reliable. Also as Josh writes, there are two parts missing, due to the fact that they're not included even in the LDD Universe Mode parts inventory. Don't forget to thank Josh for uploading these, and check out his other projects (He's one of My favourite builders).

___________________________________________________

Gear ratios (when engine axle is linked to main axle number 3):

R:
12/20 = 0.60
12/20 = 0.60
16/24/24 = 0.67

GRR=0.60x0.60x0.67=0.24


1st:
12/20 = 0.60
12/20 = 0.60
16/16/16=1.00
24/24=1.00

GR1=0.60x0.60x1.00x1.00=0.36


2nd:
12/20 = 0.60
16/16/24=0.67

GR2=0.60x0.67=0.40


3rd:
12/20 = 0.60
16/16=1.00
24/24=1.00

GR3=0.60x1.00x1.00=0.60


4th:
16/24=0.67

GR4=0.67


5th:
16/16/16=1.00
24/24=1.00

GR5=1.00


6th:
20/12=1.67
16/16/24=0.67

GR6=1.67x0.67=1.11


7th:
20/12=1.67
16/16/16/16=1.00
24/24=1.00

GR7=1.67x1.00x1.00=1.67

___________________________________________________

Modifications

As most of You know, this transmission was build to match one particular MOC, and therefore not always meets standards for other ones. I've therefore decided to make this section of the page, so that you could see how this particular gearbox can be modded to fit any of your creations. I intend to place photos of my redesigns here and link up pages of other peoples MOCs that contain it. Enjoy.

1. Shrink me!
(If the photos fade a little into blue, don't change your display settings, it's just my lack of photography skills...)

Designed to fit smaller cars. As you can see the axles mounting is completely rearranged. The distances between them are exactly the same though. The "L" beam is a little loose without any frame mountings, an example of some can be found further down the page. I've made all the photos without the 12 and 20 toothed sprockets. So that You could see more details.


A side view. It gives a better idea of the offset axle mounting. Two more photos made from the front-side view angle can be found below. Note that all the axles that extend out are left like that intentionally. That way you can see where the 12 and 20 toothed sprockets can go and where to make some frame mountings...








Remember that the mentioned 12 and 20 toothed sprockets can go either at the front or the back of the gearbox (or both like in the original design). Anywhere you have room.

Some photos of this mod with an example of frame mounting:
















I hope that this mod helped a bit:) Now use your imagination and let me know what can You do with this transmission. Be creative, and stick to the most important rule:

Forget all the rules :)



Comments

 I like it 
  March 2, 2014
You = instant job at LEGO.
 I made it 
  January 4, 2014
Quoting Clayton H I'm kinda new to gearboxes. Can you please tell me where the input is and where the output is please, thanks
Sure :) When looking from the back (2nd photo in the description), the input axle is 2nd from left (one with the 12 tooth sprocket on the outside). The output axle is the one down below.
 I like it 
  December 15, 2013
I'm kinda new to gearboxes. Can you please tell me where the input is and where the output is please, thanks
 I like it 
  April 28, 2013
Same love the small gearbox could you mail me some more pics of the small gearbox thanks agingles@btinternet.com
 I like it 
  April 5, 2013
please could you send me instructions for the smaller gearbox, my computer wont open the link and it is ideal for my next project. i'm at ben.hunt.62@gmail.com
 I like it 
  October 30, 2012
love your two gearboxs do you have any more pictures of the smaller compact gearbox as i would love to include it in my moc. i just can't get my head around how it is put together. if available could you post or send an exploaded view as this may help me and others assemble it. thanks
 I made it 
  October 20, 2012
Haven't been here in a long while due to some intense working :)
Quoting Everyone :)
Firstly. Thank you all for those wonderfull comments that I didn't respond to yet :) Thanks for all of those that have added me to their favourite builders lists. You rock! :D
Quoting Nick Perto
I have updated the link to the LDD model, now it should work just fine. It's in the text right where it was before.
Quoting jon greenland
Dear Jon. As to my gear ratio math, yeah it's kinda mixed up isn't it :) Still pretty simple. A gear ratio of 0.24 in my instructions means that every (1) turn of the input shaft causes the output shaft to rotate 0.24 times. If you want to get it your way just divide 1 over a given GR and you'll get the correct result (in this case 4,17:1).
Quoting Ben Hunt
Ben. Although I've updated the link I've still sended you the instructions liked you asked.
Quoting Daniele Lombardi
Daniele. I did noticed that :) Also a 6+R would take a lot less space (in height). It's 7+R just because I was building a Veyron :P
 I like it 
  September 1, 2012
Your design is awesome! It looks that the first and reverse are on the same axle, but with small changes you can obtain a 6+R gearbox with realistic gears scheme.
 I like it 
  July 25, 2012
hi I was just wondering if you could send me the instructions because when i click the link it says 'file not found' If you could that would be a real help. Im at 'ben.hunt.62@gmail.com'. I will credit your designs in my next creation.
  June 24, 2012
Hey,awesome design but i gotta ask, i don't get the gear ratios , because unless you have 4 overdrive gears canyou resay what the ratios are for example like 2.77:1, that's a real ratio because it takes 2.77 rotations of input shaft to spin the output shaft once which is underdrive i kinda need help with your gear math ,kind of confused that's all .
 I like it 
  January 21, 2012
You really have WAY too much time on your hands. Excellent work!... Did you say this was for smaller cars!?!?
 I like it 
  January 21, 2012
ravishingly beautiful!
 I like it 
  January 10, 2012
This is one of the best things I've seen on Moc. A compact, modern gearbox is usually one of the failings of Lego vehicles but this is fantastic. I'm going right now to make it.
 I like it 
  December 20, 2011
Hey. I can't find the building instructions? When i follow the link from Josh Lucas, this comes up: Page can't be found. I use LDD, are there a building instruction for this? - Thanks
 I like it 
  January 12, 2011
Wow! I just finished building this, and it is amazing! 6th and 7th are a little tough but still it is an amazing piece of engineering. This alone put you in my favourites!
 I like it 
  September 13, 2010
really nice dude
 I like it 
  September 6, 2010
I like what you did there... the only thing bothering me is the dislocated axle mount you mentioned... I don't imagine that to work very smooth under a lot of stress. While this surely isn't a gearbox designed for a R/C model, it's still a flaw that'd be cool to get fixed :p Keep up the awesome work!
 I like it 
  July 9, 2010
very good job i like it smart and many funktions
 I made it 
  July 2, 2010
Quoting Randy Smith "What scale would you say this transmission would fit into? 1:6 maybe? I have built it to try it out but I am not sure if it will fit properly into a standard 1:8 scale car. Have you tried building any mounting brackets to it yet to attach it to a frame?"
I'd say it's about right for a 1:8 to 1:10 scale models. When it comes to mounting. Remember that what you see on the picture is a gearbox as a monolith construction (it even has blocks that are there just so it may stand properly). It is 9 studs high on these photos (without the handle). After building it around with some beams you can get the height down to 7 studs. I place the beams pretty much differently every time, what I most often do is building it oround with a square. Parpendicular beams on the front and rear - axles 2 and 3 go through them, and then i connect them together with two parallel beams. This forms the mantioned square. After that i form a custom mounting construction underneath this square to hold down axles number 5 and 6. -Its shape mostly depends on the number and placement of other mechanisms in the vehicle.
 I like it 
  July 2, 2010
What scale would you say this transmission would fit into? 1:6 maybe? I have built it to try it out but I am not sure if it will fit properly into a standard 1:8 scale car. Have you tried building any mounting brackets to it yet to attach it to a frame?
 I like it 
  July 1, 2010
Brilliant. You've moved the game on with this.
 I like it 
  June 30, 2010
Absolutely brilliant! I'm gonna build it as soon as possible. I'm gonna by the parts via bricklink.com. It would be great if you could post a parts list. That would make the ordering much easier. It's brilliant guys like you that make me love mocpages.
 I made it 
  June 30, 2010
OK I tweaked my LDD thanks to the instructions on the site You've linked. I checked the design, except the intentionally omitted parts, there is only one missing. Here's the tip which: http://img401.imageshack.us/img401/8484/errr.png . When You've posted the instructions I didn't even started to do my own :) Great thanks for the wonderfull job mate.
  June 30, 2010
I checked the file here and was able to open it without errors.
Piotr Pilarski
 I like it 
Josh Lucas
  June 29, 2010
Hey, I created instructions for this in LDD. Could you check to make sure it's accurate? I omitted the half-stud offset on the bottom axle on purpose, since it was unique to your implementation. If it's accurate, feel free to add the file to this page, but I would appreciate it if you give me credit for the instructions. http://mocpages.com/moc.php/210902
Piotr Pilarski
Josh Lucas
  June 29, 2010
I didn't notice your comment that you were working on instructions yourself, but if you want to check mine, you need to unlock extra pieces for LDD by following these instructions: http://www.eurobricks.com/forum/index.php?showtopic=40794
Piotr Pilarski
 I like it 
Mark Legorski
  June 29, 2010
Bravo! Jestem Zdziwiony! Bardzo Ladnie Wykonane!
 I like it 
  June 29, 2010
so er.... what does it do then? it looks pretty neat but can you please make a comment about what it does?
 I like it 
  June 29, 2010
Very nice, its good to see a new gearbox design
 I made it 
  June 29, 2010
The only LEGO CAD software that I've used so far was the "SR 3D Builder". I've downloaded the LDD 3.1.3 (with brick version 114.3) and I'm not able to open the posted file with it ("Parsing the file was aborted due to an error in the file"). Is it an actual error in the file or is it my 'stock' LDD?
 I like it 
  June 29, 2010
I've never seen such a small 7+R gearbox! I'm sure we'll find your idea in a lot of cars, because you explore a new way in the design of LEGO gearboxes! Good work!
 I made it 
  June 29, 2010
Quoting Randy Smith "While this seems like a very interesting concept, That offset gear and axle just do not look right. This design may be compact width wise, but not heigth wise. I think if you worked on this a little longer you could make it even stronger. Still very cool though."
Thank You. Regarding the offset gear I must agree with You. It just doesn't look right. Though I can assure You that it does work brilliant. I've checked how it works under various tensions and it actually does work under a double XL engine MOC with 0.67 engine to gearbox ratio, 2.67 gear ratio and 1.00 differential ratio with 4x4 drive and about 1,5 kg to move :) It just does not fail. Regarding the dimensions. This is not an creation under which I was working. I'm actually building a car and this is its gearbox (its a part of an creation and not an independant creation). The height and distances between the engine and offset axles was not suppose to be minimized :) It was supposed to be right :)
  June 29, 2010
While this seems like a very interesting concept, That offset gear and axle just do not look right. This design may be compact width wise, but not heigth wise. I think if you worked on this a little longer you could make it even stronger. Still very cool though.
 I like it 
  June 29, 2010
Woot! I'm stunned. An amazing creation. Nothing more to say... BRAVO MATE!
 I made it 
  June 29, 2010
Quoting Kieran Shaw "Very very cool, how old are you? I assume your a mechanic or something?"
Some info can be found on my main page. As to my occupation. I work and study at the same time. Im a student of "Mechanical Engineering and Mechanics" at Poznan University of Technology.
 I like it 
  June 29, 2010
Astoung piece of LEGO engineering! You got me to comment on a car-related MOC, and that's no small feat!
 I made it 
  June 29, 2010
Quoting Mr. Inkognito "Excellent! A very complex MOC. Well done on that small amount of space! Have you tried to connect a motor on it? I would also like to see the instrcutions."
Thanks. And yes. I'm always connecting such creations to motors on different stages of the build. Just to make sure that everything works smooth. I didn't make a video since I didn't except such an attention :) I hope I'll have time to make the instructions and the clip still this week.
 I like it 
  June 29, 2010
Very very cool, how old are you? I assume your a mechanic or something?
 I like it 
  June 29, 2010
Excellent! A very complex MOC. Well done on that small amount of space! Have you tried to connect a motor on it? I would also like to see the instrcutions.
 I like it 
  June 29, 2010
Oh My God! Man you just have to post those instructions. You've single handedly made me create My account! This transmission OWNS!
 I made it 
  June 29, 2010
Thank you all for those flattering comments. I can see that actually a lot of other builders are interested in this designs building instructions and part list. No problem. I'll try to find some spare time this week, create them and post.
 I like it 
  June 29, 2010
Very good work!!! The size is impressive... A part list an instructions would be nice. Can you create one?
 I like it 
  June 29, 2010
awesome technic creation ,bravo
Piotr Pilarski
 I like it 
Josh Lucas
  June 28, 2010
This could be a new era in Technic gearboxes.
 I like it 
  June 28, 2010
It's now a long time I haven't seen Lego designing a large scale car built with integrated gearbox. I estimate the last time I've seen Lego doing this kind of stuff was in 1999 or 2000, that's 10 years ago. They should hire you to give a presentation as a 7-speed compact gearbox designer and insert it into their new large scale car model. Tomorrow it's the big day for me to present my Ferrari 599 GTB fous-seater sports sedan for a school course. I added two extra medium engines on te rear wheel to carry the scale car's weight. Now it has in total four medium motors that power the rear wheels and one medium engine that powers the steering compartiment. I think I'll have enough time to put the pictures and a movie on the site during the big holiday period.
 
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