[EVDL List]

Hi Mark - Fair enough.

Having posted my diatribe, I came across this interesting info...

http://www.rotaryaviation.com/PSRU%20Zen%20Part%202.html

... which intimates that the clutch pressure plate springs' purpose
are 2-fold... 1/ to remove torsional resonance between ICE and
transmission (clearly eliminated in the EV scenario as there is no
engine - but does the motor provide its own vibrations which might
lead to the same issue???) and 2/ to absorb transmission drive-line
shocks - from 'popping' clutches (...), stomping throttles, hitting
pot holes etc.

Flywheels are pointless as you say and yes, HP hogs, as you put it.
Unfortunately, if you want to keep the clutch then you need one, tho
no-where near as heavy a one as you need to keep the ICE from stalling
at idle.

MW


[quote] Mark Grasser wrote:

>
>>>> As for having a rigid coupling (aside from the above) there is
>>>> ample
> evidence that not having some form of shock absorption in the drive
> train that would normally be provided by the springs in the pressure
> plate causes premature wear failure of splines and/or gearbox/diff
> components. Why would the manufacturers put them in there otherwise?
> <<<
>
> Martin,
> I will let you have the other three although you will hear from
> others that
> shift without a clutch. Personally I believe an automatic is the way
> to go
> or as in my Fiero, I am direct coupled to the differential.
>
>
> ANYWAY, I see no reason for the springs in the disc as I am pretty
> sure they
> are more there to cushion the vibration caused by the pulses between
> the
> firing of the cylinders when use with an ICE. With a motor you have
> constant
> power during the rotation and you also have much less rotating
> forces due to
> the small diameter of the armature. Also there is a lot less mass
> there to
> begin with. I just don't see the need for it, for that matter there
> is no
> need for the flywheel either. It is also there to cushion the pulses
> of the
> ICE cylinder.
>
> In automotive racing the thing to do is to use a lightweight aluminum
> flywheel as it is then easier to increase the revs of the motor. (iron
> flywheels are horsepower hogs)
>
> Mark Grasser



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