This idea is an easily detachable power pod for any type of
cycle, able to lean with the machine and rise and fall with road
undulations and be raised when no power is required.
for any comments.
The attempt is to design an add on device that is:
- Easily attachable by sliding the pod onto a prefixed
mount and applying a clip. This mount could be designed
to fit almost any cycle rear fork as a bolt on mount or
welded on as part of the frame.
- Not much wider than the bike it is affixed to and
probably not any longer.
- Has a small drive wheel, possibly 12"-16". This
allows for less gearing down. I estimate with a standard
weed trimmer motor only a 4 or 5:1 gearbox will be
needed. (Purchased from Scooter suppliers) The wheel
could also have internal gearing of about 3 gears (EG
Sturmey and Archer) if more range is required.
- The weight of the unit should give the required grip on
the road. If not, the arm length could be experimented on
so the unit drives itself onto the road as a result of
the applied power giving additional grip as needed.
- Be able to be bump started. The motor could have no
clutch for this to work - if the drive wheel can't get
enough grip becuase of motor compression it may be easy
to put downward pressure on the motor unit with your foot
because of the position.
- Speed can be accurately predicted when fitted to any size
bike and is not dependent on a certain bike wheel size as
in hub motors for example.
- A bike handbrake lever can be used to raise/lower the pod
onto the road. Some levers are sold EG from Greenspeed that
have a locking pin - when the lever is pressed in, the
locking pin can be engaged making the lever a handbrake
and in this case raising the pod drive wheel off the
- The unit ought be designed so as not to be fouled by the
motion of the pedals.
- The design is probably most suited to petrol powered
motors as all the power items are removed in one action.
This is assuming batteries on an electric unit would not
be mounted on the pod because of their size. (which may
not be the case though)
The Arm could be:
- Single length tube - this requires the drive wheel be
mounted on one side, not always easy using normal bike
axles but possible using a hardened bolt. See http://www.ihpva.org/people/tstrike/building/frntwhl.htm
- 2 tubes. This may be a little hard to route the chain so
the chain doesn't foul on the arm. Experimentation
The unit placement is close to where a normal bike stand is
usually positioned so may interfere with it's operation.
There just may be a little sideways force applied to the bike
when motor power is applied as the unit is not mounted directly
There may be some bounce of the unit with irregular road surfaces
necessitating the inclusion of a spring and/or shock absorber to
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