![]() ![]() Ideally suited to circuit racing, drag racing and rally use it’s designed as a direct replacement for the standard six-speed H-pattern Honda transmission. So they can't make something like me, as it's not representative of the reality.QKE8J is a 5-speed sequential gearkit for the EP3 and FN2 versions of the Honda Civic Type R as well as the DC5 Integra / RSX. I also understand LEGO's choise, because their aim is to show how a real car works. In the video you can see at 0.18, 0:39 and 0:47 that it works (but as the shifter and the gearbox are not fixed, the gearbox can be tilted a bit so it's possible to move a bit the lever even if it doesn't activate another speed). Yes that's correct! On the modelization, it's the black and orange thing that prevents the selector of the 2 speed gearbox from moving to the second gear to the first by the wrong way (and from the second to the first) so after this, you can't move the selector of the 4 speed gearbox. I do think that solution is much nicer then lego's infinite loop, but i understand why lego wouldnt use it in a set, inexperienced users will run into the gearblock and might not understand what is going on, and either force it, and break parts, or think their model is broken. your gearbox would presumabling block on trying to shift up in 8th gear, correct? If I have a moment, I will try with a classic changeover catch, to see if it's possible to get something more compact. (I'll say I wasn't clear at all because it's a hot day. But in my gearbox, there are 2 driving rings with 2 possible positions, and 2 driving rings with 1 position, so it's equivalent to 3 working driving rings. Oops, I meant that for the Chiron, there are 4 driving rings and 2 possible positions by driving ring, so 8 independant positions. ![]() To make a 4x2 with only 3 driving rings, you would need to either make gear op 1:2 between the cross/towball and the orange catch to make the quarter rotation from the towball into a half rotation, or use the traditional red catch and some lever mechanism (which would still require gearing up) How do you mean your design uses four driving rings as well from the pictures? Correct me if im wrong, but yours works by having a 4 speed on one side, which is then routed through a second gearbox which only has two effective ratios, making it a 4x2 effectively? The chiron does exactly the same AFAIK. To finish, a modelization of the mechanic to have a clearer view of the gears:įinally, this is an extremly compact gearbox, easily controllable. To control this gearbox, I used the stepper of the Bugatti Chiron that I compacted a little bit (the piece in red). After some tries, I got a good result, and a perfectly controllable gearbox. ![]() Then I put the number of teeth of the gears I may use in the cases, and I got the final ratios of the gearbox. So in Excel, I recreated the structure of the gearbox using cases in the calculations (for example F3*G3/F4*G4). This means the 6th gear (2-2) must not to be lower than the 4th gear -1-4) or you cannot control the gearbox properly. ![]() Little trick: when you make a double gearbox like this, it's important to be sure that the gears are in the right order. So to change the speeds from the lowest ratio to the highest, the 4 speed gearbox does 1 2 3 4 while the 2 speed gearbox is in first gear then the 4 speed gearbox activates the second speed of the 2 speed gearbox, and it does 1 2 3 4 again. When the changeover catch of the 4 speed gearbox makes one turn, it activates the one of the 2 speed gearbox. There are 2 advantages: firstly the gearing is more compact, and then the shift system is also pretty compact. So I decided to couple a 2 speed gearbox to a 4 speed gearbox. My purpose was to make a gearbox as compact as possible. It's a gearbox I made at the release of the rotary changeover catches. I made it almost a year ago, but I didn't have the time to make its presentation. ![]()
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