New Bafang Crank-Drives

Discussions related to motors other than hub motors.
This includes R/C motors, botttom bracket, roller and geared drives.
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Föppel
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Re: New Bafang Crank-Drives

Post by Föppel » Aug 29, 2016 7:22 am

Hey folks, usualy posting in the Foto/Video and LR-Kit-sections, but think that video belongs in here.
i like the camera-position and how it moves around, but it destroyed my camera by hiting a rock... several times





shot it on the way home, Bike is this one here:
Image
Riding dirty since 1684
Fotos and Videos here : https://endless-sphere.com/forums/viewto ... =6&t=68182
Small-block Kits on 3000W+ here : https://endless-sphere.com/forums/viewt ... 28&t=78861

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tomjasz
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Re: New Bafang Crank-Drives

Post by tomjasz » Aug 30, 2016 5:39 pm

AF7JA wrote:
tomjasz wrote:Do pay attention, if you do, no big deal. I did a thread with some photos and there are others. Do it now when it's easiest.
But back to the question, are people using (auto store sourced) white lithium on the plastic and moly on the metal, or the red grease from the article on everything?

I am a bit concerned with the red grease, it looks like he felt a need to clean off all of the old grease before applying. Is the red grease a grease that does not mix well with others?
Lurking included Bafang lubrication specs here....
ttps://endless-sphere.com/w/index.php/EBike_Motors_Middrive
Thanks Justin_le we're here thanks to you. All the best to the mods for their tireless work keeping it on an even keel.

geofft
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Re: New Bafang Crank-Drives

Post by geofft » Aug 31, 2016 1:41 am

BBS02 V2 48v 750w, 12s lipo.
Q128H (36v 201rpm), KT36/48SVPR 20amp, LCD3, 48v 12s lipo.

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Green Machine
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Re: New Bafang Crank- DRives

Post by Green Machine » Sep 14, 2016 1:29 am

E-Zero wrote:ESrs, this is my way to thank you all for your comments and forum knowledge!
My completed BBS-02 13sLiPo; only pedal activated with cutoff key.
Base is a Rockrider FR-6, 140mm F&R matched with 200mm F&R hydraulic brakes.
In a single world; FUN
It is lovely to ride!
Hope you like it!
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Thanks!
wow that is really a pretty bike and beautiful picutes too.... nice work.

melodious
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Re: New Bafang Crank-Drives

Post by melodious » Oct 06, 2016 6:44 pm

So after about 1000's of miles (my E-odometer turned over :lol: ), my BBS2 has a major problem. It won't pedal anymore. The clutch pawls :?: that engage the main front pedal gear is seized. I was hearing a small ratcheting sound on human power which would disappear as Epower would engage. Didn't think much of it at the time, so I left it alone. I'm not going to try fixing it for the following reasons...

1. The newer designed and higher powered versions are available.
2. My BBS2 had plastic cover plate protecting the nylon gears (located on the right pedaled side). Over time it deteriorated and cracked. I'm hoping the newer versions have repoaced the plastic with metal :?:
3. goto reason 1 :mrgreen:
Surly Ogre rigid 29er, rear 10T MAC @ 50V 25AH & 40A: 30mph road/gravel/hill machine
42" dual diagonal Eskateboard @6s & 90mm wheels
Next: eMTB @10-12s & 8"-12" pneumatic wheels; Got Strapped? d-(',')z

Lurkin
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Re: New Bafang Crank-Drives

Post by Lurkin » Oct 07, 2016 6:49 am

Awesome... feel free to send it to me! :lol:

free-trade
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Re: New Bafang Crank-Drives

Post by free-trade » Oct 11, 2016 8:06 pm

LockH wrote:Luna Cycle just added 2 new photos to the FacePlant forum... with description:
Bafangs top secret new drive is basically a bbshd built into a lighter package for production bike with a torque sensor..... basically 4x the power of the bosch drive in a more robust more affordable unit.
Image
https://www.facebook.com/lunacycle
But this engine fits only for special frames. It is known as Bafang Max Ultra Drive and already on the webside of Bafang.
Every year there is a 24h-Pedelec Race(assistance only until 25kmh, like German Street law) at the famous "Nordschleife of the Nuerburgring Racetrack" organised by Bosch: one team by Bosch itself(Bosch Factory Team or Worksteam? not sure how you call it), many other teams all using the Bosch Performance Line and one single team with Banfang MaxDrive(250W, not the Ultra with 1000W). The Bosch management was not amused by the result of their race :mrgreen: :mrgreen:
A pity that you won't be able to buy one in Europe (Bafang won't sell it, because they think there is no need for a bike you are not allowed to ride, except on your own property.

The problem why we do not have an ebike motor with a torque sensor, which fits for most bikes like the BBS02/BBSHD does, is quite simple:

The torque sensor of most Ebikes(old Bosch, but the new Bosch Performance Line, CX ...has a different solution) is around the axle of the bottom bracket(sorry, I don't know the correct english word for this part),
but you can see one here:

Image

There is no space for this and they are quiet expensive, that's why Bosch changed the torque sensor they used(which they had to buy from FAG) around 2013 and now uses one of their own parts.
But they needed another gearing for this. Negative: if you ride the bike without assistance you can feel that you need more power than with a normal bike.

I made this video when I changed some bearings inside(how stupid is it to use no sealing for a E-MTB for 4600e and the main bearing failed within the first 1000km). It shows how the new torque sensor works.

https://vimeo.com/179562731

The part with the gears can rotate at an axis when you start to pedal(same thing that happens with hub motors and why they need torque arms). I move the part in video like it this.
The torque sensor goes through this part, now it can't move any more, but the sensor measures this force and sends a signal between 0-2.5V to the controller.
It's a sinewave signal, there is a polish developer who build a small controller with bluetooth to generate this signal and can use it as a throttle (and has much more power(over 1200W) by using restitors) :mrgreen:

Some hub motors use a simple sensor at the chain and measure this way how much power comes from the rider, but with a middrive this won't work as it would create an endless loop.
sorry for my poor english, I had to look up many technical terms because english is not my native language

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Allex
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Re: New Bafang Crank-Drives

Post by Allex » Oct 12, 2016 2:56 am

Where can I find this polish guy with his BT throttle?

free-trade
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Re: New Bafang Crank-Drives

Post by free-trade » Nov 04, 2016 8:25 pm

Allex wrote:Where can I find this polish guy with his BT throttle?

Sorry that you had to wait so long for this answer.
I tried to contact him with the PM function in different forums in which I had read that he had a controller that could simulate a throttle for the Bosch middrives after 2013
But they were written half a year ago and after that he was no longer active.
Some weeks later I found his youtube videos and could send him a message.
He told me that he tried to find a certain number of people to start a small production of a much smaller unit.
But his videos only show the function, but no power and speed is shown = not very motivating. The motor looks very slow

But I think the 2016 Bosch CX Middrive has a lot of potential. No problem to ride my fully with 29x2.35" tires with 50km/h(32miles/h) until the battery is empty(draws about 1000W).
I use 45:10 tooth(Front sprocket can be changed from 35 to 60tooth)-
I can climb any hill, it is unbelievable how good the torque sensor works. You don't have to think how much power is needed for the perfect grip/traction.
Just ride and you will directly feel it. (45T:42T Sram XX1). You will forget that you have a motor after a short time.
sometimes I wish there would be a programmable gearsensor (0-15kmh with cut off, >15kmh no cut)
You can write him a message, he told me everything in detail. But like me, his native language is not english...but I could understand everything easily.
He still had 1 controller left, but without the bluetooth function to change the signal with a smartphone app.

https://www.youtube.com/watch?v=i2xuQ17iCMY

free-trade
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Re: New Bafang Crank-Drives

Post by free-trade » Nov 05, 2016 4:30 am

I read every posting and text, I can find about Banfang BBS02 and BBSHD, but I find a lot of different statements and don't know which are true.
There are 50% difference, for example when people write about how fast their bike is(of course fat bike and road bike will lead to different results)

Can someone(or more then one person) tell me how fast will an Ebike with a BBSHD and 52V battery (30-50A const. current) be?
It should be a MTB(Suspension, but for now it will be locked) but with tires that run very good on the streets(Schwalbe Big Apple 29x2.35" or Marathon Supreme 29x2.0" with high pressure, over 2.5bar).

What do you think, how fast can you go with pedalling(PAS and enough gears are available ) and without pedalling(throttle)??
How much Wh should you choose for at least 40km/25miles range(at the coldest day of the year with strong wind :shock: )?

Thank you very much for your help

Triketech
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Re: New Bafang Crank-Drives

Post by Triketech » Nov 06, 2016 10:29 am

I've been expecting Bafang to come out with a Mid Drive that has both torque PAS and a throttle. Just a matter of time.

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