Audi ebike

[grindz145]

He had a bit of exposure on that bridge climb in the Netherlands.

Possibly the most amazing thing I've ever seen. Not even that hard really, but man...

[Bison_69]

Hi Guys...

Check this out.... an outstanding ebike design made by AUDI and controlled with a SmartPhone...
Simply awesome!...
http://www.youtube.com/watch?v=qZcRIKcsFNY&feature=player_embedded

[adrian_sm]

viewtopic.php?f=3&t=39525&hilit=audi

[sk8norcal]

One of the highlights on the Audi stand at the 2012 Wörthersee was the bicycle technology concept known as the Audi e-bike Wörthersee - a sport bike that does not fit into any of the usual categories. It is neither a pedelec nor a conventional bike, but is best described as a high-end pedelec made by Audi for sport, fun and tricks. The Audi e-bike Wörthersee combines the Audi brand's principal competences - design, ultra, connect and e-tron - and explores the limits of what is technically feasible in terms of design, lightweight construction, networking and electric mobility.

This show bike is futuristic at the very first glance - a bike for tomorrow and beyond. All its components, even the pedals, have been shaped by Audi's designers, for instance the 26-inch wheels made from CFRP that weigh only 600 grams (1.32 lb) each and have innovative large-area blade-pattern spokes.

The Audi e-bike Wörthersee's ultra-light carbon-fiber frame weighs only 1,600 grams (3.53 lb). It makes use of bionic principles derived from nature. Material reinforcements are needed only at the points where loads actually occur. The swinging arm for the rear wheel is also made of CFRP. All in all, the Audi e-bike Wörthersee represents the full extent of the brand's expertise in ultra-lightweight design.

The rear wheel is driven by a chain. The electric motor is a permanent magnet synchronous machine; it is located at the lowest point on the frame and drives the bottom bracket shaft directly. Maximum torque at the rear wheel is in the region of 250 Nm (184.39 lb-ft). Peak output from the electric motor is 2.3 kW - a new top value on the e-bike scene. The complete bicycle weighs only 21 kg (46.30 lb), equivalent to a power-weight ratio of 9 kg (19.84 lb) per kilowatt, or 7 kg (15.43 lb) per horsepower - another record-breaking value

[John in CR]

...Peak output from the electric motor is 2.3 kW - a new top value on the e-bike scene. The complete bicycle weighs only 21 kg (46.30 lb), equivalent to a power-weight ratio of 9 kg (19.84 lb) per kilowatt, or 7 kg (15.43 lb) per horsepower - another record-breaking value

Audi was doing great until they started talking about records. At only 2.5 times the weight, my SuperV with 6 times the output (soon to be 7x or 8x with no weight gain, just a program change) has more than double the power to weight ratio of the Audi.

I still love the Audi. I bet Optibike is crapping in their pants. Competition is good. Both Opti and Stealth need to step up their game. Whoever gets to that kind of performance with a price tag well below $3k, wins.

John

[rjoe]

that guy should really strap his helmet on

That guy is one of the best trial champions of the world. This ride was no more risk to him than walking the sidewalk is to you.

Fair enough. I never strap my helmet when I'm walking the sidewalk.

[John in CR]

that guy should really strap his helmet on

That guy is one of the best trial champions of the world. This ride was no more risk to him than walking the sidewalk is to you.

Fair enough. I never strap my helmet when I'm walking the sidewalk.

Other than off road riding everyone is at less risk per mile on their bikes than walking on the sidewalk.

[rjoe]

Has anyone here ever tried mounting a motor like this in place of the bottom bracket?

Would this be do-able with hub motor? I think it's a really elegant solution for mid-drive.

[Tench]

yes seeing this got me thinking whether an hub motor could have a much larger dia spindle fitted so a pedal crank could fit through the centre of it so it could be mounted this way, it is something i shall look further into for a compact mid drive solution, there would be the need for a double freewheel at the front on the concentric shafts for it to be useable as motor drive, pedal drive or both. It does need some thought regarding the wiring exit and the kv/pedal cadence too.

[Miles]

Would this be do-able with hub motor? I think it's a really elegant solution for mid-drive.

The problem is that it will have less than half the available power that it would have in the wheel (assuming that it's to be run in series with the pedals).

[Miles]

For those that haven't seen it before: viewtopic.php?f=28&t=27132

[Tench]

For those that haven't seen it before: http://www.endless-sphere.com/forums/vi ... 28&t=27132

Twin drive chains would be a much simpler solution without the problems, or maybe a different set ot problems.

Anyway regardless of that, i want/need one of these Audi bikes!!

[rjoe]

Would this be do-able with hub motor? I think it's a really elegant solution for mid-drive.

The problem is that it will have less than half the available power that it would have in the wheel (assuming that it's to be run in series with the pedals).

could you expand on this a little, please?

[GCinDC]

awesome. more adoring closeups, from here:











i'd love to see under the covers tho.

[Miles]

could you expand on this a little, please?

Power is the product of torque and speed. Torque output is pretty much determined by motor size. If a motor that runs at >200rpm in the wheel is restricted to running at <100rpm in order to match pedalling cadence, it's speed and therefore its power is halved. If you have a motor in the bottom bracket, it needs a lot of reduction gearing to generate enough torque. Optibike do this with multi stage planetary gearsets, the Audi bike uses a harmonic drive.

[Miles]

Patent application for the Clean Mobile harmonic drive, as used in the Audi fahrrad-wunder......

[bobale]

awesome. more adoring closeups

Holy crap, it looks AWESOME!

[rjoe]

could you expand on this a little, please?

Power is the product of torque and speed. Torque output is pretty much determined by motor size. If a motor that runs at >200rpm in the wheel is restricted to running at <100rpm in order to match pedalling cadence, it's speed and therefore its power is halved. If you have a motor in the bottom bracket, it needs a lot of reduction gearing to generate enough torque. Optibike do this with multi stage planetary gearsets, the Audi bike uses a harmonic drive.

that makes sense. now i understand why you posted that mechanical drawing

[Phoebus]

If this bike ever goes into production, and looks as these photos show, it's going to be expensive as hell. If it's anywhere near Optibike and Stealth in price, this Audi bike would be an absolute steal.

[Jason27]

That bike is just rediculous! .. sp

[Green Machine]

Just the brakes on that bike (brakeforce One) are carbon fiber (mold injected) and cost $800.

[Green Machine]

It seems that Clean Mobile, the maker of the Audi Bikes drive system that miles mentioned might be going bankrupt:

UNTERHACHING, Germany – Electric drivetrain supplier Clean Mobile AG applied for insolvency beginning February. According to the receiver, Dr. Christian Gerloff from the Munich based law firm Ott Gerloff, Clean Mobile has a good chance to survive. Therefore operations are continuing.

Innovative e-drivetrains
Clean Mobile AG was founded in 2006 as a startup R&D company manufacturing: “Innovative e-drivetrains for light vehicles.” The company is located in Unterhaching near Munich and currently employs about 20 people. After an initial success with its fast e-bike kit the company presented an e-bike kit for EPAC’s with up to 25km/h pedal assistance at the 2011 fall shows. Brands such as Corratec, KTM, Third Element and PG Bikes are making use of the Clean Mobile’s e-bike kits.

Search for investors
Receiver Gerloff started, together with KPMG, to look for investors to take over the company. “Clean Mobile is one of the pioneers in e-drivetrain technologies and was developing progressively. Therefore there are good chances to find interested parties looking for innovative technologies in these times where alternative environmental-friendly drivetrains are on the rise.”

[Lock]

It seems that Clean Mobile, the maker of the Audi Bikes drive system that miles mentioned might be going bankrupt:

No date or reference link?

Try here:
http://www.endless-sphere.com/forums/viewtopic.php?f=28&t=17090&start=42

TQ-Group acquired Clean Mobile AG via asset deal

Tuesday, April 17, 2012

By Jo Beckendorff

UNTERHACHING, Germany – Bavarian electric service provider TQ-Systems GmbH acquired the assets of Clean Mobile AG.