Quote:
Originally Posted by RogerM
Forget the idlers ... far too small in mass to have a major effect over the other components listed!
It is all about the rotation of the top shaft.
External idler
anticlockwise direction;
pinion, topshaft, diff/shafts/wheels
clockwise direction;
both idler gears
4 gear internal
anticlockwise direction;
pinion, 1st idler, diff/shafts/wheels
clockwise direction;
topshaft, 2nd idler
Quite a bit of mass in the topshaft assmebly ....
If it doesn't make sense draw a quick picture .... I will try to later if I can get it to upload.
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Ahh yes!! So if we take the layshaft assembly and the diff as the major rotational components;
In the 4 gear gearbox setup their rotational moment is subtracted from each other - as the two assemblies are rotating in different directions.
In the idler setup, the rotational forces are added - as the two assemblies are roatating in the same direction.
Food for thought Roger! Thanks