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Post by noakira on Aug 14, 2011 22:42:37 GMT 1
Possible Hybrid type Project ?
Has anybody ever thought about wrapping an electric motor around the rear driveshaft ?
Basically it wouldn't be used to solely drive the bike more like a top up on the power for when cruising, reduce the over revs of the engine therefore saving fuel. It would be on a button that would be pressed to activate the motor whilst easing back on the throttle but still cruising at the same speed. It could be swapped out with the horn button, nicely placed.
It just seems it would be an easy conversion to wrap an 18 / 24v high torque power drill type motor around the rear driveshaft.
Obviously you would have to mount another battery in a rear top box or somewhere. Could have it so its plugged into an optimate on a nightly basis.
Just a thought ?
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Post by De Graaf van Salland on Aug 15, 2011 8:20:48 GMT 1
Nice idea, But I would say that you'd use the electric motor more when accelerating, not when cruising. All the hybrid cars also use a combination of petrol power and electric power during acceleration. When they're cruising (which hardly uses any power at all) the battery is re-charged. But I like the idea. Just think that you'll be able to keep up the power when you're shifting gear. There is, of course, also the downside: a lot more weight attached to your rear wheel. That could unbalance the bike (perhaps you could balance the weight of the motor on the left with the weight of the battery on the right ?), but you'd also have to accelerate and decelerate these weights. That could undo the positive effect of the additional power  If you achieve a 10% increase of power, but also a 10% increase in weight, then there is no nett effect. What could cause problems is the effect of the mass rotation around the drive shaft. When braking you'll have to stop the rotation of this (additional) mass as well. I would love to see someone trying out this idea. GvS |
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Post by noakira on Aug 15, 2011 21:55:34 GMT 1
"What could cause problems is the effect of the mass rotation"
My thoughts exactly. Some how you need the drive shaft to rotate freely within the electric motor windings with it only engaging when the button is pressed. Avoids the winding being spun all the time when its only being used perhaps for 10% of a journey. So you would have the driveshaft - windings - magnets all floating maybe until required.
You say about cruising not using much power ? As an example, your doing 70mph (6500rev) on the motorway, you ease back on the throttle, possibly even coast with clutch handle depressed then engage the electric motor. So revs are at tick over (1100rev) but the bike is still being propelled at 60-70mph. Until you hit an encline that is. The longer the bike cruises beyond the normal coast distance the more fuel and greater mpg will be acheived.
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Post by De Graaf van Salland on Aug 16, 2011 9:38:53 GMT 1
"What could cause problems is the effect of the mass rotation" My thoughts exactly. Some how you need the drive shaft to rotate freely within the electric motor windings with it only engaging when the button is pressed. Avoids the winding being spun all the time when its only being used perhaps for 10% of a journey. So you would have the driveshaft - windings - magnets all floating maybe until required. That would mean that you'd also have to fit an electric clutch You say about cruising not using much power ? As an example, your doing 70mph (6500rev) on the motorway, you ease back on the throttle, possibly even coast with clutch handle depressed then engage the electric motor. So revs are at tick over (1100rev) but the bike is still being propelled at 60-70mph. Until you hit an encline that is. The longer the bike cruises beyond the normal coast distance the more fuel and greater mpg will be acheived. I would estimate that an added electric motor could only generate a maximum of about 10% of the power that the normal petrol engine can generate. So using only the electric motor while doing 70 mph on a motorway is not an option in my view. And have you thought about the housing of such an electric motor ? Our NTV's have a single-side mounted rear wheel, so all the forces between the rear wheel and the bike's frame are passed through the house of the drive shaft. This is a cast-aluminium part, so very difficult to modify. In my opinion you would have to split this part in two: a front- and rear-end; and put 'your' electric motor in between. This means that all the forces (as mentioned above) must pass through the house of the added electric motor........ I still like the idea. But when it comes to a practical implementation of the idea, I personally see a lot of obstacles. GvS |
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Post by noakira on Aug 20, 2011 8:30:50 GMT 1
Gvs your right, it was more the concept and the fact that the rear section un-bolts which lent itself to an easy "bolt in motor" section. Obviously you would have to cast a whole new swing arm (shortened to allow for the bolt in motor) front section.
The main obstacle I see even before this is that the Revere is just too much of a heavy lump, with its metal frame and heavy industrial build. Your 10% would be wasted just overcoming friction created by the bike itself.
So.... Honda Bros 400cc possible with a motor mounted on the bump on the pro-arm and linked with a second chain wrapped around another 23 teeth cog bolted to the rear cog !
Hypermiling Honda's !
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Post by rj2para (Bisto) on Aug 20, 2011 9:02:19 GMT 1
The Bros frame would also be lighter.
You could always fit Batteries like ED to the lighter frame.
How about then fitting a very small cc motor to power a generator to top up the batteries to give you range.
No idea technically on the size of small motor just thought small would give economy.
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Post by noakira on Feb 16, 2013 19:51:14 GMT 1
Its been a while since I posted but been looking at Pedelec's lately as there gonna be big this year and what should I come across "Protanium" shaft drive bike ! www.protanium.com/4.htmlThe model in the video is a bit suspect, they must have got there teenage son to mock it up. He seems to struggle with relative anatomy ;D I wonder if Honda have seen this ...... Shaft drive electric hybrid NC700ex with a battery that slids into the petrol tank space, remember I said it here first ! |
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