I've been searching in vain for a 2 speed transmission for quite a while
now. Are these devices available off-the-shelf?
lyle sloan wrote:
Here is the idea from the other thread.
A two speed select using a double sided compensator
design.
The design is pretty versatile and again simple. The
first and second gears are freewheeling. The chain for
both of them can go to the wheel or to a motor shaft
as per your needs or materials on hand. The selector
clutch or pawl moves between gears on a keyed shaft
and rotates with the keyed shaft. It has three
positions: 1st, neutral, 2nd. It engages by pressing
against either gear. The third sprocket has a chain
that goes to the wheel or motor shaft (per your needs)
and is firmly attached to the keyed shaft.
http://img.photobucket.com/albums/v424/slodown27/concepts/2speedclutchusingcompensator.jpg
Selection engagement can be a lever like on a VW
clutch or 2 hydraulic brake cylinders that engage 2
brake calipers (one going one way then one going the
other) like from gokarts. I figure adjust so that the
brakes dont grab and, well, brake. Ensure that a
disconnect switch activates when switching gears or in
neutral so that the motor doesnt over rev. If the
motor is off, there shouldnt be much drag when
engaging or the sudden grab like with a dogleg.
http://img.photobucket.com/albums/v424/slodown27/concepts/selection.jpg
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