I thought I would start another thread on the Keystone bike, I would like this thread basically to be about the Friction Drive System along with theories and experiments.
Since I've never built one before this will probably be a trial and error thang.
Any advice and comments are welcomed.
There are friction drive systems available, basically those gas/electric add-ons that you mount on the rear wheel, some of them seem too work pretty good. In my case I need a drive system that uses pedal power and electric power working together but individually, if that makes sense lol.
I have several ideals and Cadcam drawings along with 3d object building tools all available to help build this thing.
I'm going to start with some drawings to set a general idea on the gears layout. also in building it I haven't taken too much thought about the gear ratio, basically I'm gonna look at it like an rc car set up.
Multi gears, with one gear turning in reverse, I did give that issue plenty of thought, it would of been weird pedalling backwards to go forward
.
Since electric motors turn counter clock wise, I'm able to chain it up direct to a freewheel that is attached to the friction wheel. The pedal part of it is a little more complicated, it will require three gears to turn the friction drive counter clock wise so the wheel will turn clockwise, looking at it from the right side of the bike.
To do that looking at the right side of the bike, I will need a top gear on the unit to be very strong, since it will take most of the torque while peddling, instead of the chain pulling on the rear of the friction gear, it will pull from the front, the third gear will be a simple chain tensioner, as illustrated in the pics. Note the friction gear will need two freewheels attached to its axle to work, I hope.
Since I've never built one before this will probably be a trial and error thang.
Any advice and comments are welcomed.
There are friction drive systems available, basically those gas/electric add-ons that you mount on the rear wheel, some of them seem too work pretty good. In my case I need a drive system that uses pedal power and electric power working together but individually, if that makes sense lol.
I have several ideals and Cadcam drawings along with 3d object building tools all available to help build this thing.
I'm going to start with some drawings to set a general idea on the gears layout. also in building it I haven't taken too much thought about the gear ratio, basically I'm gonna look at it like an rc car set up.
Multi gears, with one gear turning in reverse, I did give that issue plenty of thought, it would of been weird pedalling backwards to go forward
.Since electric motors turn counter clock wise, I'm able to chain it up direct to a freewheel that is attached to the friction wheel. The pedal part of it is a little more complicated, it will require three gears to turn the friction drive counter clock wise so the wheel will turn clockwise, looking at it from the right side of the bike.
To do that looking at the right side of the bike, I will need a top gear on the unit to be very strong, since it will take most of the torque while peddling, instead of the chain pulling on the rear of the friction gear, it will pull from the front, the third gear will be a simple chain tensioner, as illustrated in the pics. Note the friction gear will need two freewheels attached to its axle to work, I hope.
