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.
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).
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:
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
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
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 'email@example.com'. I will credit your designs in my next creation.
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 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!
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.
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?
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.
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.
I checked the file here and was able to open it without errors.
I like it
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
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?
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."
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 :)
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.
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.
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.
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.