[MV] Re: Pre-selective gearboxes and clutches

Douglas Greville (dgrev@apollo.ruralnet.net.au)
Sat, 06 Jun 1998 09:49:16 +0930

Andreas

> no hydrodynamic converter and only a normal clutch. This clutch is
> used to bring the vehicle in motion and later to change the gears.
> So you have a real good old clutch and clutch pedal on these trucks.

I see. Good idea.

> You can also combine a preselective gearbox with a hydrodymamic
> converter.
> In this case you need a small extra clutch to cut of the engine torque
> during the gear shift. This small clutch is only a "Gear change
> clutch"
> and not designed to be used to bring the vehicle in motion. If you do
> this, the small clutch will be ruined soon.

As far as I can tell the Ferret does not use this system either, but
instead has a "bus bar" (for lack of a simpler term) which through
linkages puts pressure on only the band that corresponds to the
required gear. When the pedal is pushed the bar moves away from the
bands, the linkages alter to suit the pre selective gear and when
the pedal is let out pressure is put onto the required band. Thus each
band serves as a type of clutch (and as you say, are only small and
easily ruined).

This is why you are not allowed to leave a Ferret parked in neutral
as the bar springs will weaken, there will then be too little
"clamping" pressure to the band and it will burn out.

Regards
Doug

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M8 Ferret

dgrev@ruralnet.net.au

Web Armour site at: http://Fast.to/DG

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