J
[email protected]
Guest
Frank Krygowski writes:
>> This is a dead design. Let it rest in peace.
> Except that I've got a live one or two, with applications in mind.
> I'm interested in the real extent of the problem, and if justified,
> possible solutions.
As I suggested, take the planet pins (axles) and grind a one degree
funnel shaped taper on their stepped ends being careful to not take
off any more of the case hardening than needed. Then do the same for
the four leading faces of the "clutch, only so far in to where the
pins bear on it. That place should be obvious from polish markings
from use. 1 degree is about 0.0175inch per inch. Since this is a
matter of less than 1/10 inch it isn't much depth but it is a greater
angle than the elastic disengagement angle.
If you haven't had a failure and you don't intend to pedal hard while
standing at significant speed, it may never be a problem, especially
if your pedaling doesn't produce continuous torque. In that case the
clutch can home between each pedal stroke and will never pop out, as
it doesn't with most users (and I suppose the justification for not
changing the design) although the S5 hub did. However, that was
necessary because it uses only three planets but uses the same driver
parts with four quadrants.
Jobst Brandt
>> This is a dead design. Let it rest in peace.
> Except that I've got a live one or two, with applications in mind.
> I'm interested in the real extent of the problem, and if justified,
> possible solutions.
As I suggested, take the planet pins (axles) and grind a one degree
funnel shaped taper on their stepped ends being careful to not take
off any more of the case hardening than needed. Then do the same for
the four leading faces of the "clutch, only so far in to where the
pins bear on it. That place should be obvious from polish markings
from use. 1 degree is about 0.0175inch per inch. Since this is a
matter of less than 1/10 inch it isn't much depth but it is a greater
angle than the elastic disengagement angle.
If you haven't had a failure and you don't intend to pedal hard while
standing at significant speed, it may never be a problem, especially
if your pedaling doesn't produce continuous torque. In that case the
clutch can home between each pedal stroke and will never pop out, as
it doesn't with most users (and I suppose the justification for not
changing the design) although the S5 hub did. However, that was
necessary because it uses only three planets but uses the same driver
parts with four quadrants.
Jobst Brandt