BUGATTI T46 Surprofilée 1/8

[Egon]

I have a photo of the gearbox in my gallery

[PROPELLER]

You are welcome Egon! Thank you very much, all references will be useful for me... and others! Can you post the photo in this thread?

[Egon]

Here you go:
And: http://www.ebay.de/itm/Pocher-1-8-Di...0AAOSwImRYW9Tr

[PROPELLER]

Thank you very much Egon! Useful indeed... And it's a T46 chassis! In fact, I have some trouble with this area:




I can't understand this connection...

[koehlerkment]

Hi Dan,

do you mean the two rods? If so, I can explain. They are the selector rods. The bronze cylinders are tubes that contain a spring and a steel ball that fixes the selector rod which has three notches (gear engaged/ neutral/ other gear engaged).

I appreciate your skill.

Regards,

Klaus

[PROPELLER]

Thanks Klaus!
My trouble is not about the rods, but the connection gearbox/main shaft...

[koehlerkment]

This is a device to allow for some flexibility in the connection gear box-driveshaft. The circular plate on the gear box has four raised blocks that engage in corresponding notches on the drive shaft. Both plates are joined by bolts with strong springs on the drive shaft side. I assume that this was necessary because the swivel radius of the torque arm and that of the connection gear box - drive shaft are not identical. This seems a typical Bugatti construction, a Hardy disc or a universal joint would have served equally well.

[koehlerkment]

Perhaps the picture below shows the construction a bit more clearly.

[Trapper]

I would say times, this is a replacement for a cardan shaft, since the transmission is synonymous yes springs. The force could not be transmitted otherwise without limiting the fermentation.

[PROPELLER]

Thank you guys! But I clearly understand the function... I don't understand the different pieces who are put together!

[Roger Zimmermann]

If I'm understanding that strange system correctly, you see the black flange which is welded to the drive shaft. The second flange just behind has fingers which engaged to the 4 recesses from the drive shaft's flange. The second flange is also connected to the first one with 8 or 10 bolts; the bolts are under tension with the springs which can be seen touching the first flange. Therefore, the second flange can oscillate according to the suspension travel. The third flange, the brass/bronze one, is part of the transmission.
From an engineer point of view, just at looking at the picture, this system is....mediocre. Could be that the oscillations were so minimal that the system was doing its job without problem.

[PROPELLER]

Thank you Trapper and Roger!
I never thought to springs... Mediocre I agree. On the other side, leather flange, not better!
If i understand well, it is the system, sorry no CAD at home!

[Roger Zimmermann]

The springs are not between both flanges, but at the back of the drive shaft's flange. When there is an angle between both flanges, the rear one is pulling the bolt/spring assembly.
At least, it's the way I'm understanding the system; just remember I never had a look at a real Bugatti as this make is not my glas of red wine (translation: my cup of tea)!

[Egon]

This site could be a good place to ask the owners of real cars on the questions we never can find: http://www.bugattipage.com/index.htm
And a chance to get more info here

[parryj]

Hi gentlemen!

To John, unfortunately, no secret! Drilling, filling, sanding , hours...

Thanks for looking in,
Dan.

ThanksDan!