Instructables

Spring loaded bicycle braking system , Does double duty as a Propulsion aid through gears . Feasible??

  Basic Idea: When used to help slow(not primary brakes) a strong coil or spring is tightened to aid slowing. When maximum amount of tightness is reached the coil disengages somehow, The coil could be kept in the tight state until released for use for a burst of propulsion through reverse gears
. Totally non-electric and light. It would be ideal for stop-and -go bike commuters , up and down hilly areas ,etc.     
   Same idea could used for smaller cars, motorcycles,etc. Has this been used before ? Feasible ? Any critiquing of the concept is welcomed .

Picture of Spring loaded bicycle braking system , Does double duty as a Propulsion aid through gears .   Feasible??
cdubnbird4 years ago
 how about simply regenerative electric braking?  stick a motor on there and when you break have it proportionally increase the load on the motor therefore slowing you down and charging a presumed battery.  going up the hill let the motor use what puny little energy it collected while braking to give you the tiniest aid.  ha cool idea but i don't really think it's meant for bikes
BtheBike (author)  cdubnbird4 years ago
Thanks CD. I actually already have an e-bike with regen braking . Its great and it prompted me to brainstorm an all mechanical design. 
The inner tube has elasticity which can be loaded using a flywheel of small weight
the small diameter spinner can also have weighted levers which expand at sufficient speed, (like a governor flywheel). If you put the flywheel to spin horizontally more stability would be achieved by its gyroscopic effect.
So the spinning part can be a smaller size winch or ratchet that is a mechanical device that allows continuous linear or rotary motion, while the bungee corded inner-tubes can stretch in a vertical triangle spiral like a coil spring, releasing its energy into a gear sprocket which acts as a transmitting point of acceleration.
BtheBike (author)  prepositional1 year ago
there is a flywheel bike designed already and its great although too heavy for what I'm thinking . This http://www.youtube.com/watch?v=UHPrOloikVE&feature=related design is more similar to what i had in mind .
My idea is to use the entire radius of the wheel, loading springs in between spokes, compressing with a full wheel size coil spring activated gear.
akaleeroy2 years ago
Can anyone contribute the calculations for this stop and go scenario? Sorry, I was abducted by aliens and all my high school math & physics have been erased from memory.

70kg rider on 12kg 26inch wheeled bicycle stops at a traffic light on a 10% slope, then shifts into most convenient low gear.

When the light turns green, what kind of force is required of the spring/coil so that the extra boost is worthwhile to the cyclist?
orksecurity4 years ago
It sounds like you're trying to invent mechanical regenerative braking.

I suspect the required hardware would weigh enough to cost you more energy than it could save. But that's just a guess.
BtheBike (author)  orksecurity4 years ago
Ork , yes, prototypes are often too bulky for their own good.  I'm not so mechanically inclined but I would think the heaviest thing would be a strong spring or coil . The rest would be pins and cables like any brake system plus a reverse gear like any freewheel cassette. Just my guess of course too .
And I think it would be a mechanical nightmare, but when I'm riding stop and go it would be nice to have a help getting back up to speed.
rickharris4 years ago
Public transport systems in hilly country have used a form of regenerative braking where the energy from braking is put into spinning up a fly wheel.

BUT as said the hardware would probably far out weigh the advantage.