7+R sequential gearbox (DCT)

[Leviathan]

Hi everyone,

Lately, I read topic on Audi R8 from Jeroen Ottens (https://www.eurobricks.com/forum/index.php?/forums/topic/178368-wip-audi-r8/) and it remembers me that I had such a prototype of a sequential gearbox.

It's an improved version of my sequential gearbox used on my Bugatti Chiron 1/8, lighter and more compact. I use 4 orange rotary changeover selectors. 

I just want to say that is only a prototype version unfinished that I wanted to share with you. Please do not judge assembly design, but system core. 

 

How does it works ?

- The main shat is the center one and it's made the dual clutch shaft

- On each side, there is 1 half-gearbox. One with odds speeds (1, 3, 5, 7) and the other one with even speeds (R, 2, 4, 6).

- On main main shaft, there is an offset of 90° between the 2 orange changeover. Its engage only at time one of the half gearbox.

 

The real secret of the gearbox is the offset between each half gearbox. I used a factory wheel with 2 pins with tow ball to create this offset. See the picture below :

Of course, the gearbox has a end stop to prevents 7 to Reverse shifting. 

Ratios ;

R : 1,2
1 : 0,6
2 : 0,75
3 : 1
4 : 1,67
5 : 1,8
6 : 2,1
7 : 3

The reverse speed is too fast. 

I worked to an improved version too, smaller that prototype. The arrow shows the right way to shift up.

 

 

Finally the video to understand the mecanism :

 

 

I hope you will like it !

See you soon ! 

 

 

 

 

[Scoar Sonander]

Nice! Instructions would be great!