Regenerative braking for bicycle

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    Bicycle Braking
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Discussion Overview

The discussion revolves around the concept of regenerative braking for bicycles, specifically exploring methods to store kinetic energy during braking. Participants consider various mechanisms, including torsion springs and compressed air, and discuss the implications of weight and design challenges associated with these systems.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant proposes using torsion springs to store kinetic energy during braking but expresses difficulty in designing a gear system to facilitate energy recovery for acceleration.
  • Another participant raises concerns about the added weight of such a system potentially negating the benefits of regenerative braking, questioning whether the bicycle is engine-powered or pedal-powered.
  • A third participant suggests using a flywheel with a rubber cone to capture kinetic energy, proposing a mechanism to disengage the system when stopped and re-engage it for energy use.
  • There is a mention of an existing thread that may provide additional insights or related discussions, although the relevance is not elaborated upon.

Areas of Agreement / Disagreement

Participants express differing views on the feasibility and practicality of regenerative braking systems for bicycles, with no consensus reached on the best approach or the implications of added weight.

Contextual Notes

Participants do not fully address the assumptions regarding the types of bicycles being discussed, nor do they resolve the potential mathematical or engineering challenges involved in the proposed systems.

iamthegelo
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Hi,

I was wondering about the idea of having torsion springs as a means to store kinetic energy when braking in a bike. I've thought about using compressed air but I am having troubles designing a gear system for both so that you can get the energy back to accelerate from rest.

Can anyone give me some inputs? Me and my group are stuck.

Thanks
 
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Such a system would add weight. Would not the extra weight negate any benefit of the regenerative system. Also what kind of bike. engine powered or pedal powered. If its pedal powered I have no troble accelerating my pedal bikes. Thats what gearing is for.
 
I know people should be encouraged to think about new ideas, but I can't resist posting this...

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(see this PF thread: https://www.physicsforums.com/showthread.php?t=79028&page=275 )
 
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Use a flywheel with a rubber cone attached to it. Mount the assembly on a track that will keep the surface of the cone in contact with one of the tires. Design a mechanism that will allow you to disengage the system when stopped and re-engage when you want to use the stored KE.

The added weight becomes transparent once the vehicle is up to speed the first time.
 

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