And for celebrate it I will show you many information about all my sequential gearboxes until today.
With my latest cars (Caterham Seven and Shelby GT500), I have introduced a new sequential gearbox type, and to avoid problems with how to call this new one, I decide add a new way to call all of them.
Since now the new versions of the sequential gearboxes will be called with ordinal numbers. In this ordinal numbers don't enter other gearboxes types like: dual clutch, planetary or CVT, just normal sequential gearboxes.
|Here you can see, from left to right: 1st Gen gearbox(Veyron) and 2 discarded dual-clutch gearboxes|
Create a gearbox is very hard and it needs a lot of work, here some failed gearboxes before get a functional one, all them built between February and May 2009:
This is a preliminary version of the 1st Gen gearbox with only 5+R speeds.
A fast resume of all generations, type and versions
This was my first sequential gearbox(I think this was the fisrt Lego sequential gearbox with more than 3 speeds, but I am not sure), I designed it in 2009 to be used in my Bugatti Veyron.
The version used in my Veyron is a 7+R speeds. with a little modifitacions you can get a 4 speeds or a 5+R speeds versions.
The main feature that distinguishes this generation is that it has a speed selector in linear motion, and the distance between speeds are 2 studs.
Correct speeds change ratio: ~70%
To can learn more about it here.
In Octuber 2010 I designed a second version with auto-clutch. It worked fine, but I decide not publish it beceause it was too big to be used in any car.
Before to finish the Veyron, I started to develope a new car(the Porsche), and even before I know what car I will build, I wanted to use again a sequential gearbox, but the Veyron's gearbox wasn't an option because it was too big. In the search of a new smaller gearbox I developed many differents prototypes. And this was one of them.
Finally I decided to use a dual-clutch gearbox to be more accurate to the real Porsche.
The main feature that distinguishes this generation is that it has a speed selector in linear motion, and the distance between speeds is only 1 stud.
I have used this gearbox in 3 of my big MOCs until today, all of them with differents speeds configurations and add-ons.
Type 1 - 2 switches(4 speeeds), without auto-stop, without clutch (Mini Cooper)
Correct speeds change ratio: ~90%
Here the Mini's gearbox. It was the first
Type 2 - 3 switches(5+R speeds), with auto-stop, with auto-clutch (Land-Rover Defender 110)
Correct speeds change ratio: ~80-85%
Here the Lad-Rover drivetrain.
This drivetrain also includes a range gearbox and a 2WD/4WD selector, but the sequential gearbox is a normal 2nd Gen gearbox.
Type 3 - 5 switches(9+R speeds), with auto-stop, with auto-clutch (Peterbilt 379)
Correct speeds change ratio: ~80-85%
Here you can see the whole Peterbilt drivetrain. You can se the main gearbox, the drive motors, the range gearbox and the pneumatic module(compresor, compresor control and brakes control). In total 5 PF XL motors and 3 M.
The history of this gearbox is very strange. Like the 2nd Gen, this gearbox was initialy developed as a alternative gearbox for the Porsche, but in this case I couldn't make a good system to generetare the auto-stop mechanism, so I leave it in a box of a while...
The main feature that distinguishes this generation is that it has a speed selector in circular motion.
To reduce the size of the few speeds versions I created two types: one for 2 swtiches and another for 3 and 4 switches.
Type 1 - 2 switches only
This type change one speed for each 90º of the selector switch movement.
Correct speeds change ratio: >95%
I will publish some information about it comming soon.
Type 2 - 3 & 4 switches
This type change one speed for each 45º of the selector switch movement.
This gearbox is specialy recomended for 4 switches, because with only 3 switches the saved space compared to the 2nd Gen is not significant, maybe around 5-10%. But with 4 switches the saved space is more than 20%
Version 1 (V1) - Caterham Seven (with auto-stop, with clutch)
Correct speeds change ratio: ~85-90%
This new gearbox is more reliavable than the 2nd generation, but it still have a little problem, and I need to fix it before publish nothing more about it: it can't support high torque. I could avoid this problem in the Caterham adding an external torque converter, but this is not the ideal way to do it.
Here you can see the Caterham Seven drivetrain.
Version 2 (V2) - Ford Mustang Shelby GT500 (with auto-stop, with clutch)
Correct speeds change ratio: ~90-95%
This is a little bit smaller and more reliavable version of the 3rd gen. And with the torque problem fixed.
Here the Mustang GT500 drivetrain.
For the future I have some ideas for new gearboxes generations, but they are only ideas... nothing more, and I don't know when I will can have a working prototype.
I hope this long explanation can help you to understand my gearboxes family and the high quantity of models developed along the years.