Making an economic electric bike

Cars, buses, bicycles, electric airplanes: all electric transportation that exist. Conversion, engines and electric drives for transport ...
Antond
I learn econologic
I learn econologic
posts: 14
Registration: 19/08/08, 11:51
Location: Amiens




by Antond » 22/08/09, 18:56

That's it, I did everything like Flytox said.

I directly took a steel sheet 3mm thick.
I started by sticking the image that I had printed with tape.
Oily with a drill and Drills worthy of the name (titanium), I cut all around and started to hollow out the pinion.
It gives me that (sorry for the quality of the photos, I only had my phone):
Image

Then I went there with the file to rough it all. And I also had to file the peaks at the tip because the small links in the chain are only 2mm wide.

Image

After I had more than to position my holes, drill, put the small pinion and 2 bolts and it's ready:

Image

Once put on the axis, we can see that it is perfectly aligned:

Image

This chain will finally stop derailing for a yes or for a no!

Thank you all for your advice.

Another question: I will get an electric bike which is equipped with 36V li-ion battery. I don't have the charger that goes with it. I also don't know the condition of the batteries.
Do you advise me to look for a charger (with the risk of realizing that the batteries are dirty) or do you know how I can make one or adapt one?
Or dismantle the battery compartment, transfer them and put in new lead batteries (6 * 12V 7Ah, (3 in series) * 2, 14Kg, 25 €)?
0 x
dirk pitt
Econologue expert
Econologue expert
posts: 2081
Registration: 10/01/08, 14:16
Location: isere
x 68




by dirk pitt » 24/08/09, 10:29

Antond wrote:.... Or dismantle the battery compartment, transfer them and put in new lead batteries


Ah well no, it would be sacrilege if the battery is good.
replace lithium with lead :!:
If you have no idea what condition the battery is in, I recommend the following:
you already measure the total voltage: if they are <34V empty, suspect
if you can, you open the battery and you measure each element which must be> 2.9V

Before investing in a Li-ion charger, you need to know if your battery is good.
you get a 36V li-ion charger loaned and you try a charge cycle.
CAUTION, do not use a LiPo charger which charges a 4.2V per cell, but a Li-ion charger whose maximum voltage is 4.1V per cell. the difference is small but important to avoid damaging the battery.
0 x
Image
Click my signature
User avatar
delnoram
Moderator
Moderator
posts: 1322
Registration: 27/08/05, 22:14
Location: Mâcon-Tournus
x 2




by delnoram » 24/08/09, 10:47

4.1V It was before, the li-ion are also at 4.2V for a long time.

especially check that they have not swollen.
0 x
"Thinking should not it be taught in school rather than to make learning by heart the facts that are not all proven?"
"It's not because they are likely to be wrong they are right!" (Coluche)
Antond
I learn econologic
I learn econologic
posts: 14
Registration: 19/08/08, 11:51
Location: Amiens




by Antond » 30/08/09, 23:16

That's it, I got the bike in question.
I was wrong, the batteries are not lithium but lead.
When I got them back, the batteries were 5V each.
I thought they were dead.
So I put them to charge in a charger which took about 30 hours to recharge a battery. At first it supplied the battery with 6V then gradually increased to 12,8V.
I then reweld them and put them back in the compartment.
I tried the bike which indicated that the battery was charged (3/4).
It did not work, the engine did not start.
So I dismantled it, located the fault (faulty right brake sensor), cut 2 wires and reassembled.
The bike works well, I did a few km (I think between 5 and 10) but it will be necessary that I recharge it at some point ...
I looked at the price of a charger which is around 80 € (double the price that the bike cost me).
So I am thinking of moving towards a switch system that will switch my batteries from series to parallel. This will allow me to recharge the batteries with a conventional 12V charger ...
I also have a bulb which is not very efficient but which consumes a lot at the headlight. I intend to put a diode to replace it. Do you have an idea of ​​the resistance that I have to put to make it work under 36V?
Thank you in advance.
0 x
dirk pitt
Econologue expert
Econologue expert
posts: 2081
Registration: 10/01/08, 14:16
Location: isere
x 68




by dirk pitt » 31/08/09, 09:07

first congratulations for your repair. you already have something that works.
if the battery is not mounted at 13.5V at least, it is surely not badly damaged but good, you can still roll a little.
these batteries have the advantage of not being expensive (within 30 euros each) so you can change them at a lower cost.

for the charger, the best is to buy a cheap 36V lead charger. I bought one from virtual village. it is thereof
that's good enough for this kind of thing.
0 x
Image

Click my signature
Antond
I learn econologic
I learn econologic
posts: 14
Registration: 19/08/08, 11:51
Location: Amiens




by Antond » 31/08/09, 14:47

My battery is not mounted very high because I stopped the charge before. Indeed if the bike did not work, I would not wait 6 days (2 days * 3 batteries) to be clear.
But you must be right, I think they are damaged because they were stored empty for a while.

Your charger looks not bad, the only problem is the socket which is not the same on my bike (It is this socket for mine: http://www.veloselectriques.net/chargeu ... 54e47fb785 )
Ultimately, I can tinker with it and put back a piece of wire that goes over it.

For the price, if I have no choice, I will buy it at full price. The charger also costs in transport and in charger !!!
0 x
Antond
I learn econologic
I learn econologic
posts: 14
Registration: 19/08/08, 11:51
Location: Amiens




by Antond » 02/09/09, 23:18

It's good, I ordered a 36V lead charger for not too expensive (€ 15 + € 3 pdf).
It's not the right plug but for the price, I will disassemble the charger and change the cable ...
I just have to change the batteries.
It's a shame, I'm missing a few centimeters in the battery compartment to be able to accommodate 6 12V 7Ah batteries : Cry: :frown:
0 x
Antond
I learn econologic
I learn econologic
posts: 14
Registration: 19/08/08, 11:51
Location: Amiens




by Antond » 04/09/09, 22:08

dirk pitt wrote:first congratulations for your repair. you already have something that works.
if the battery is not mounted at 13.5V at least, it is surely not badly damaged but good, you can still roll a little.


Mounted at 13,5V, do you mean the battery voltage when it is charging or the battery voltage once the battery is recharged?
0 x
User avatar
quartz
I posted 500 messages!
I posted 500 messages!
posts: 640
Registration: 20/01/07, 14:38
Location: Parisian region




by quartz » 05/09/09, 21:45

Good evening everyone,
Come see HERE, you are going to see a curious bike, not to say snap, and probably not economical !!
Ha these marketers they know how to do it.

A+
0 x
Every minute that passes is an opportunity to change the course of your life.
YouTube page, Dailymotion page, Picasa album, personal Pages, Viktor Schauberger
User avatar
Flytox
Moderator
Moderator
posts: 14138
Registration: 13/02/07, 22:38
Location: Bayonne
x 839




by Flytox » 05/09/09, 22:25

quartz wrote:Good evening everyone,
Come see HERE, you are going to see a curious bike, not to say snap, and probably not economical !!
Ha these marketers they know how to do it.
A+


Indeed, to wallow in braking it must be tip top.
Ouch! Bobo head !! : Mrgreen:

Image
0 x
Reason is the madness of the strongest. The reason for the less strong it is madness.
[Eugène Ionesco]
http://www.editions-harmattan.fr/index. ... te&no=4132

 


  • Similar topics
    Replies
    views
    Last message

Back to "Electric transport: cars, bicycles, public transport, planes ..."

Who is online ?

Users browsing this forum : No registered users and 153 guests