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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. . 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 :)


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