Comments on: Compressor pneumatic bike http://bicycledesign.net/2008/02/compressor-pneumatic-bike/ The blog about industrial design in the bike industry Fri, 03 Jul 2015 01:27:56 +0000 hourly 1 By: Tom Waxman http://bicycledesign.net/2008/02/compressor-pneumatic-bike/comment-page-1/#comment-39277 Tue, 11 Feb 2014 16:08:54 +0000 http://bicycledesign.net/2008/02/compressor-pneumatic-bike/#comment-39277 its a concept previously administered to
steam engines and steam power transmition,
Consider this :
As the rider Pedels forward , two pneumatic
piston pumps which are pinion attached to the designed rotary pedal crank arms ( one for each side , pumps / pistons are horizontally opposed )
these piston pumps continuesly work in unison stroke by stroke , filling the bike frame
with compressed air. The pumps are also designed to be pistons. As the bike frame tank reaches capacity a reserve capacity tank no 2 located in the drink bottle holder fills with air and becomes the primary tank, a computer controller decides when to open and shut
four solenoid valves.
At 30km an hour for 5-10 mins the riders tanks have built up 300psi.
Now for the cool part , The controller detects minimum pressure acheived based on
air input and bike speed , and the reverse flow system from the filled tanks is opened.
a crank angle sensor tells the controller to open the reverse flow too the pump/pistons.
The rider is still compressing air with the other pump/piston.
The rider now has 300 psi of air , pushing the rotary pedal crank arm forward releiving the amount of actual power/ torque required from the riders legs.

not perpetual , the rider has to pedal too move forward but
but instead of the riders legs doing all the work the piston/pumps
releive some 30-40% of energy required to keep the bicycle moving.!

thought this up in my brain a while ago and have been workin on designs.
use this free infomation to change the way we ride!.

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By: ACB http://bicycledesign.net/2008/02/compressor-pneumatic-bike/comment-page-1/#comment-11835 Wed, 08 Sep 2010 07:41:42 +0000 http://bicycledesign.net/2008/02/compressor-pneumatic-bike/#comment-11835 Old post, but worth a shot, well as fellow ID here, I’d say it’s a growing process of Innovation, but to say that compressed air generates continuous motion for the bike (most unlikely), many factors needs to be re-considered (super vacuum formed metal?I’d say it’s metal forging…expensive) that’d be like filling a tank of compressed air size of a hummer (takes a while,just to go round a block) you’d be pedaling to nowhere,good job though of generating “out of the box” innovation,you’d never know where you could pick up where somebody else left behind

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By: linear actuator http://bicycledesign.net/2008/02/compressor-pneumatic-bike/comment-page-1/#comment-3283 Fri, 14 Aug 2009 07:22:06 +0000 http://bicycledesign.net/2008/02/compressor-pneumatic-bike/#comment-3283 Pneumatic tools usually requires compressed air. Now that's pretty impressive

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By: Anonymous http://bicycledesign.net/2008/02/compressor-pneumatic-bike/comment-page-1/#comment-3146 Tue, 16 Jun 2009 19:16:35 +0000 http://bicycledesign.net/2008/02/compressor-pneumatic-bike/#comment-3146 Leave the drive train alone. That would be spinning your wheels. For pure regenerative braking, efficiency doesn't matter. The energy your storing was 100% inefficient to start with. What is important is the component weight. If the added components could be transparent to normal riding until engaged (during braking), it would be a win for sure. Time to get clever with materials and triggering mechanisms. As to thermals, stopping at a light and then reclaiming the energy seconds later gives the gas little time to transfer heat outside the system. The tricky part would be the non linear response of the system.

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By: Justin http://bicycledesign.net/2008/02/compressor-pneumatic-bike/comment-page-1/#comment-1351 Tue, 04 Mar 2008 21:13:00 +0000 http://bicycledesign.net/2008/02/compressor-pneumatic-bike/#comment-1351 It would add an interesting element to racing…the ability to store energy. If you could do a bunch of work before a hill climb to store energy then open a throttle to zip up the hill that’d be pretty awesome. The strategy would totally change.

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By: Anonymous http://bicycledesign.net/2008/02/compressor-pneumatic-bike/comment-page-1/#comment-1346 Thu, 28 Feb 2008 04:05:00 +0000 http://bicycledesign.net/2008/02/compressor-pneumatic-bike/#comment-1346 I have been working on a concept like this myself. Not using compressed air though. I think for about 3 lbs I can build a regenerative brake system with 94% effeciency.

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By: Andy Cochrane http://bicycledesign.net/2008/02/compressor-pneumatic-bike/comment-page-1/#comment-1286 Wed, 13 Feb 2008 21:55:00 +0000 http://bicycledesign.net/2008/02/compressor-pneumatic-bike/#comment-1286 i like the idea of regenerative braking in bikes, and this design is really interesting in approach- the efficiency issue would need to be worked out for sure. i wonder what a hydraulic drive train would be like (it would be heavier than a chain) in conjunction with some sort of air compression for energy storage… might that solve some of the efficiency issues?

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By: Richard http://bicycledesign.net/2008/02/compressor-pneumatic-bike/comment-page-1/#comment-1267 Thu, 07 Feb 2008 02:58:00 +0000 http://bicycledesign.net/2008/02/compressor-pneumatic-bike/#comment-1267 I actually graduated with James, and I know that the 25% efficiency was simply a base figure, and not at all meant to be the actual working efficiency.
Actual figures would be much higher; the 25% was a “worst possible scenario” figure. He’s got more research that backs his design up, maybe he could provide the higher end of the spectrum for skeptics.

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By: Hallian http://bicycledesign.net/2008/02/compressor-pneumatic-bike/comment-page-1/#comment-1261 Mon, 04 Feb 2008 20:20:00 +0000 http://bicycledesign.net/2008/02/compressor-pneumatic-bike/#comment-1261 I certainly like the thinking, I heard somewhere that the urban cyclist uses somewhere in the region of 70-80% of their energy accelerating again after having to top at lights or slow down for pedestrians/ traffic etc. A regenerative solution would certainly be useful but using a compressible medium in the drive I am certain is not practical. The bike would feel horrible to ride if nothing else. How about hydraulic drive with some kind of accumulator re-gen?

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By: jimmythefly http://bicycledesign.net/2008/02/compressor-pneumatic-bike/comment-page-1/#comment-1259 Mon, 04 Feb 2008 19:23:00 +0000 http://bicycledesign.net/2008/02/compressor-pneumatic-bike/#comment-1259 I’d love to have some sort of regenerative braking, I can’t stand hitting ared light and feeling like I’m just wasting all that energy into heat on my brake pads. All the solutions seem to end up too heavy, where the energy gained wouldn’t offset the extra weight. (electric, flywheels, this).

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