powdersummit
New Member
My ultimate goal is to build a kit for a full suspension downhill bike that has climbing ability and a decent top speed on the flat. I love the idea of electric and running it through the crank derailleur system but I don't like the idea of having to drop $400+ on batteries to get any range. A small 4 stroke is cheaper, has more range and doesn't involve expensive electronics that can go "POOF!" Now the problem is how do I get the power to the crank when I can't place the motor in the frame because of the size? A series of belts and chains would be complicated and would be bike independent.
Solution: Hydraulic drive! I've thought it out and here's how I'd do it. Honda GX35 or EHO35 on a rear or front rack setup, geared down 2:1 with the clutch still being used to a small hydraulic gear pump. From there run hydraulic lines down to the front crank area where you have another larger displacement motor with a freewheel on the shaft, from there have a 2:1 reduction to a freewheel crank. The return line from the pump/motor would then go through a small filter into a small reservoir to be run back through the system. There would be no valves in the system due to the fact you are using the clutch on the motor to regulate if the system is moving or not and the bike speed would depend on rpm and which gear you were in on your derailleur.
You would have to work through the numbers on the total reduction depending on what size pump/motors you were using and how much reduction to have from the motor to the crank but that isn't that difficult.
The idea would work in theory in my screwed up head but I'd like to hear what some of you have to say. I still need to work out the numbers for fluid velocity and reservoir tank size.
Carl
Solution: Hydraulic drive! I've thought it out and here's how I'd do it. Honda GX35 or EHO35 on a rear or front rack setup, geared down 2:1 with the clutch still being used to a small hydraulic gear pump. From there run hydraulic lines down to the front crank area where you have another larger displacement motor with a freewheel on the shaft, from there have a 2:1 reduction to a freewheel crank. The return line from the pump/motor would then go through a small filter into a small reservoir to be run back through the system. There would be no valves in the system due to the fact you are using the clutch on the motor to regulate if the system is moving or not and the bike speed would depend on rpm and which gear you were in on your derailleur.
You would have to work through the numbers on the total reduction depending on what size pump/motors you were using and how much reduction to have from the motor to the crank but that isn't that difficult.
The idea would work in theory in my screwed up head but I'd like to hear what some of you have to say. I still need to work out the numbers for fluid velocity and reservoir tank size.
Carl