Hybridization spring! Bicycle Mechanical Assistance

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izentrop
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Re: Spring hybridization! Bike with Mechanical Assistance




by izentrop » 16/04/16, 01:03

A "greenness" which paid off quite a bit http://www.kisskissbankbank.com/le-velo ... -accelerer? 8) . Not seen the rest?
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Re: Spring hybridization! Bike with Mechanical Assistance




by raymon » 16/04/16, 06:52

A "greenness" which paid off quite a bit http://www.kisskissbankbank.com/le-velo ... -accelerate? 8) . Not seen the rest?

Good method to destroy a discussion indeed it would have been better to go to a bank we lend money so easily today!
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Re: Spring hybridization! Bike with Mechanical Assistance




by raymon » 16/04/16, 08:26

There a study of the different types of flywheel, chemical, pneumatic and spring hybridization:
http://sycomoreen.free.fr/syco_francais ... dim%B0.pdf
Spiral springs are rather well placed in the final ranking!
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Re: Spring hybridization! Bike with Mechanical Assistance




by izentrop » 16/04/16, 16:31

He looks serious the president http://startsquare.io/ils-l-ont-fait/it ... ardi-cussc
1st prototype
manufacture of the metal mechanism
4 200 €
carbon fiber spring manufacturing
2 600 €
test bench
200 €

A total of € 7,
with € 3 of personal contribution,
and your precious help,
this 1st prototype will be produced


Depending on your donations, a finished product may be available for Christmas (look well under the tree).

Thank you very much for your participation in this fabulous project,

Bruno Civardi
spiers-carbone.com

http://www.kisskissbankbank.com/le-velo ... -accelerer

Christmas of what year ??
They got the money in November 2014
Any news on this first prototype ??

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With 115 Nm ??? ... What assumptions if the project does not see the light of day.
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chatelot16
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Re: Spring hybridization! Bike with Mechanical Assistance




by chatelot16 » 16/04/16, 20:38

the spring is really a means of storage of shabby energy ... in the genre a spring watch must be wound every day and a battery watch takes one year before changing batteries, despite the quality of the battery watch much lower than the quality of the spring watch

there is a real classification of efficiency of current storage means: best electric battery ... weaker compressed air ... even weaker spring

compressed air and spring still have the advantage of a less limited number of cycles than the batteries but that is not enough to make them useful
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Re: Spring hybridization! Bike with Mechanical Assistance




by Grelinette » 16/04/16, 22:37

In my opinion, it is ridiculous to compare this energy recovery spring system with other energy storage and restitution systems such as batteries: it is impossible for it to provide autonomy equal to the most basic VAE.

This system with spring reminds me of the little children's cars that rub on the ground to tighten the internal spring and let go: the car starts suddenly at full speed but stops 1 or 2 m further!

On the other hand, starting from the principle that when starting the battery of a VAE is very stressed (as well as the calves of the cyclist *), this system with spring would perhaps be very complementary to the electric motor of a VAE, exactly like the system on the mower as described Macro, but the additional weight on board, and price, risks being a handicap for the success of the system.

(* Some pedelecs even have a small start help button which adds power to start easier and faster)

... I add, that as a regular cyclist to go to work, and given the deplorable state of French roads with holes and bumps every 10 meters, it would surely be more efficient to design a recovery system from energy from shock absorbers! ... : Cheesy:
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Re: Spring hybridization! Bike with Mechanical Assistance




by izentrop » 17/04/16, 01:22

Grelinette wrote: this spring system might be very complementary to the electric motor of a pedelec,
More profitable and easier to switch the engine to a generator when braking. All pedelecs should be designed on this principle and there would be no additional cost.
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Re: Spring hybridization! Bike with Mechanical Assistance




by raymon » 17/04/16, 07:54

there is a real classification of efficiency of current storage means: best electric battery ... weaker compressed air ... even weaker spring

You should read carefully the 2nd link that I put and you will see that the spring is not so ridiculous as that. I find the cost / efficiency particularly unattractive.
http://sycomoreen.free.fr/syco_francais ... dim%B0.pdf
By choosing a maximum radius of 25 cm, an increase
radius ation 2,875 cm / turn (i.e. 8 turns),
an initial average radius of 2 cm, a thickness h of
12 mm and a depth b of 10 cm, we obtain:
L = 6,79 m, K = 445,25 Nm / rad, the volume of the spring
t: 19635 cm
3
And for a rotation of 2.5 turns:
6994.
rap
CN m
=
and E = 54 J equivalent to a revival at 931 km / h
.
i.e. 5500w for 10 seconds

Izentrop I linked a spring system for a bike that I found on the net you can think what you want from the designer of the bike I don't care the discussion here is not whether this person is a crook or not, thank you not to pollute the discussion. Who wants to drown his dog accuses him of rabies.
I find this system interesting a bit like the Peugeot hybriair which both have the advantage of simplicity and reasonable cost.
http://altmob.com/fr_FR/l-energie-vient-de-l-air
http://www.usinenouvelle.com/article/hy ... le.N307190
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Re: Spring hybridization! Bike with Mechanical Assistance




by Grelinette » 17/04/16, 11:48

izentrop wrote:
Grelinette wrote: this spring system might be very complementary to the electric motor of a pedelec,
More profitable and easier to switch the engine to a generator when braking. All pedelecs should be designed on this principle and there would be no additional cost.

It is true that it is curious that very few pedelecs are equipped with a system making it possible to generate current under braking.
I read on this subject that a good generator is a bad engine and vice versa, and consequently such a system adds an additional cost to the bicycle which does not compensate for the gain in energy recovered ... (the specialists will confirm or not this argument ).

(But the commercial sirens may be that it is currently more lucrative to sell battery upgrades or more powerful batteries than a recovery system! ...)

Anyway, trying to break free from "all battery" by a little mechanics (flagship argument of the designer: rarefaction of lithium + polluting recycling) is an ecological argument that holds, especially if the system is simple, efficient and economical.
In addition, when the battery is empty (*), this system can still assist the cyclist.

(* I bought a VAE and I see that the manufacturers' data regarding autonomy is like cars: largely over-evaluated! : Evil:
My bike equipped with a 9 Ah battery planned to travel 40 to 60 km ... I don't know how they evaluated this autonomy but I am far from the account, even in normal use).
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Re: Spring hybridization! Bike with Mechanical Assistance




by dirk pitt » 17/04/16, 11:55

Grelinette wrote:My bike equipped with a 9 Ah battery planned to travel 40 to 60 km ... I don't know how they evaluated this autonomy but I am far from the account, even in normal use).


if it's 9Ah at 36V, it's 324Wh which is a bit tight for 50kms unless it doesn't go up too much. but it is possible
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