Slipping Brake Rotors?

[ringo]

New regulations to ensure that the brake discs rotate at the same speed as the wheels while a two-stage wheel fastener retaining system has been made mandatory.

Just saw this in the article about the changes to the regs for the future. Are teams out there doing this and what are the benfits of brakes that don't rotate at the same speed as the wheels?

How would a system that does this be designed?

[Lycoming]

http://www.f1technical.net/forum/viewto ... ke#p519876

tl;dr a planetary gearset on the hub and probably some sort of aerodynamic benefit.

[ringo]

I see, come to think of it there are vehicles with brakes upstream of the differential.
This would mean a faster brake rotor, but there will also be a smaller force required because of the gear ratio.



The question is why?

Seems related to energy recovery system control..

[Greg Locock]

why ban it? because a vehicle has two primary safety related systems, and both should be as robust as possible. The FMEA for a brake that includes gears, driveshafts etc etc etc is going to be much longer than one for a standard system.

The same argument would apply to a lesser extent with inboard brakes.

[riff_raff]

A friction braking system that rotates at a higher speed than the wheels can have a lower braking torque to absorb the same amount of power. How about adding a tiny multi-disc carbon brake to the transmission input shaft and cutting the size of the two rear wheel brake rotors in half?

[Lycoming]

Yea, but then you put more stress on the driveshaft and all the transmission components. Though, you do reduce caliper torque on the suspension components. Plus, I take it you'd be braking through the differential?

[DaveKillens]

Jochen Rindt died at Monza, and the probable cause of the accident was a failure of one of front brakeshafts on the Lotus 72. While braking from maximum speed on the entry to the famous Parabolica, Rindt’s car snapped to the left, hit the poorly installed safety barriers and was demolished.

Brakes are a critical safety device, and one of the best ways to ensure they do not fail is to keep the system as simple as possible. These days we see brake rotors mounted directly to the wheel hub, nothing can be simpler. Every time you add anything between the brake rotor and wheel hub you increase the chances of failure.

[countersteer]

I don't have a clue what benefit this would have in an F1 car but here's an invention for bikes where it spins the rotors in reverse of the wheel at a higher speed. The idea is to counteract the inertia of the wheel. Nice read anyway....

http://reverserotatingrotors.com/index.html

[PhillipM]

Yea, but then you put more stress on the driveshaft and all the transmission components.

Perhaps, but when you're already harvesting for the ERS through them anyway...