Retro-Direct gearing systems

What?????? does that have the freewheel on the left side???? Looks like and Escher drawing!!
otherDoc
edit: Ahhh! Two freewheels and they are reversed? Is it like the BMX bikes with the reversable wheels?????
I need a drink!
 
Shepherd Retro-Direct System AD1900

[Illustration from The Dancing Chain - Frank Berto - Publ. Van der Plas 2005 - http://www.thedancingchain.com/]
 

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Ah! eureka! Your the motor that reverses! Thats wierd, but good for electric conversion for 2 speed gears. I dont pedal backwards, thank U!
otherDoc
 
Ya know, if U put a third freewheel on the pedals, the motor could ron in 2 gears at different times for max efficiency, and U would be set up to pedal forward for one of those situations to help the motor, maybe the lower one for hills to reduce amp draw! obviously U would only have one effective gear, and freewheel when the motor is reversed! Howzat!
otherDoc
 
Yes, that would work. But, maybe pedalling backwards isn't as awkward as it seems...?

This system isn't ideal for combined gearing, though...

I envisaged it as a separate drive on the LH side for the motor only. Maybe you could even have an automatic gear change, triggered by a wheel rpm sensor (with generous hysteresis)?

Perhaps the ideal case for the implementation of the retro-direct idea would be a 2 speed geared hub motor 8)
 
voicecoils said:
with two opposing freewheels can you stop peddling? Or does it behave like a fixed gear bike in each direction?
Click to expand...

It freewheels.

Regeneration wouldn't be possible with a retro-direct system.

I like the simplicity of changing gear by reversing drive direction, that's why I thought we could explore the idea to see if we could come up with a practical implementation, for our needs.
 
Miles said:
voicecoils said:
Also (I think I'm right, here) you can't "back-drive" it, so it would be difficult to isolate the motor when you wanted to used pedal-power only.
I like the simplicity of changing gear by reversing drive direction, that's why I thought we could explore the idea to see if we could come up with a practical implementation, for our needs.
Click to expand...
Click to expand...

Just use a freewheel at the drive connection to the wheel.
 
Here's some more:

http://www.m-gineering.nl/retrog.htm

http://www.youtube.com/watch?v=MejbEGsqUzE

http://myspace.voo.be/pcoupard/retrodirect_drive/

http://www.freebase.com/view/guid/9202a8c04000641f8000000004e386d1

http://www.youtube.com/watch?v=DT-2H_aWrkg
 
Brainstorm!!! Oogah! What about a Shlumpf(sp?) drive type situation on the bottom bracket that reversed the pedaling to forward when U kicked it in! You could then have multi gears on those freewheels, and not have to pedal backwards! Just a passing thought in a clouded brain! U still would need a bottom bracket freewheel.
otherDoc
 
No gears in the BB drive except forward and reverse! Hey! I said it was a brainstorm, not necessarily a GOOD idea! :)
otherDoc
 
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