DUAL DRIVE 3speed Freewheel/Sprocket Attachment

[EbikeMaui]

This is to only give you a visual of a system that works great with any 2000 - 4000 rpm 1kw motor.Two freewheels sprockets and side by side for(pedal and motor) The motor wheel sprocket hub clamps onto a freewheel bearing that has no teeth on the od and the freewheel id is splined just like the cog pictured to slide onto the free hub.
Quiet composite Kevlar and carbon fiber sprockets can be purchased for as little as $7. each for sizes up to 92 teeth...
http://tinyurl.com/yj4jv6

 

[Miles]

Thanks for posting these, Randy.

Did you broach the splines into threaded freewheels? Are they a clearance fit or did you press them onto the driver?

 

[Lowell]

Any chance of making one that will support much more power?

 

[EbikeMaui]

Any chance of making one that will support much more power?

I only tested this hub with 1600 watts of power and it has been used to clibmb a volcano several times pushing 300 lb load.I have over 20,000 miles on one hub without a failure.how much more power do you need for a bicycle? To make a moped with no pedals and a 1 speed that does not freewheel there is a single speed driver that can be purchased that locks out the drive in any shimano rear derailer hub for use with a 5 kw programable bldc motor with regen.
If you just want single speed ebike just slide it all on a shimano freehub.actually a 3 cog derailer cassette can take the place of the bmx freewheel for three pedal speeds with one motor speed to 30 mph if needed.
A NICE new feature would be small manual disk clutch in place of the motor drive sprocket bearing and have 3 speeds in the hub that is spragless for regen or coasting optipns and down shifting. More likely to be on a emotorcycle.

 

[EbikeMaui]

Thanks for posting these, Randy.

Did you broach the splines into threaded freewheels? Are they a clearance fit or did you press them onto the driver?

The larger sprocket uses broached automotive transmission bearing and the other is a $6. DICTA FREEWHEEL,They both slide on and are secured with the cassette cap nut.
end of story

 

[Lowell]

I want enough torque to lift he front wheel easily at low speeds, and to do circular burnouts and other tricks. Right now it will only burn out standing over the bike, and wheelies need a bit of help. Doubling the torque to around 300Nm would be a good start.

 

[xyster]

I want enough torque to lift he front wheel easily at low speeds, and to do circular burnouts and other tricks. Right now it will only burn out standing over the bike, and wheelies need a bit of help. Doubling the torque to around 300Nm would be a good start.

How about converting a motorcycle to a Perm'd or ETEK'd bicycle -- including working pedals?

 

[Reid Welch]

Thanks Randy!

Say, if you can someday soon post close-up pictures of these parts,
to make really clear to folks like me who are not so familiar with bike parts:

-picture the assembly of the stacked freewheels
-links and part numbers and more pictures of same.

Anywho, the design is sound. We know that.
And it's your design. You do get the credit

and tell you what: by disclosing details as you are doing,
you vault your reputation up to one notch below or above sainthood.

This is the best revenge, friend.


:wink:

Make it all crystal clear. Because to newbies, your abbreviated description
still lacks for detail. Pictures. Pictures, part numbers and vendors, a total
DIY thread is called for.


thanks!

 

[Lowell]

I want enough torque to lift he front wheel easily at low speeds, and to do circular burnouts and other tricks. Right now it will only burn out standing over the bike, and wheelies need a bit of help. Doubling the torque to around 300Nm would be a good start.

How about converting a motorcycle to a Perm'd or ETEK'd bicycle -- including working pedals?

That would be a waste of a motorcycle in my opinion, and wouldn't really look like an ebike. My idea is to make something slow into something fast, not the other way around.

 

[EbikeMaui]

Thanks Randy!

Say, if you can someday soon post close-up pictures of these parts,
to make really clear to folks like me who are not so familiar with bike parts:

-picture the assembly of the stacked freewheels
-links and part numbers and more pictures of same.

Anywho, the design is sound. We know that.
And it's your design. You do get the credit

and tell you what: by disclosing details as you are doing,
you vault your reputation up to one notch below or above sainthood.

This is the best revenge, friend.


:wink:

Make it all crystal clear. Because to newbies, your abbreviated description
still lacks for detail. Pictures. Pictures, part numbers and vendors, a total
DIY thread is called for.


thanks!

no one likes Diy . Thats why you have hub motors.

 

[TylerDurden]

You da man Ran,

I wuz surfin those damn bearing/freewheel sites for hours & hours over the past few days.

As Mathurin might say: I'm getting edumacated.


8)

 

[EbikeMaui]

You da man Ran,

I wuz surfin those damn bearing/freewheel sites for hours & hours over the past few days.

As Mathurin might say: I'm getting edumacated.


8)

search for a decade and you will still not find everything available !

 

[TylerDurden]

Search for a decade and you will still not find everything available!

Hey, what we can't find, we just have to make... eh?

8)

 

[EbikeMaui]

Search for a decade and you will still not find everything available!

Hey, what we can't find, we just have to make... eh?

8)

Or look harder... http://www.koyousa.com/ http://www.jtekt.co.jp/e/products/bearing08.html
You will be suprised what ebike motors and parts you can find in a wreaking yard.

 

[Miles]

Here are some more links on one-way bearings.

http://www.stieber.net/
http://www.zxz-bearings.com/onewaybrg.htm
http://www.marland.com/products/sprag/sprag-csk.html

These are the best freewheels:
http://www.whiteind.com/ENO-free-specs.html