2 piece driveshaft tech Q's?
Posted: Tue Sep 23, 2003 2:47 pm
Okay, I'm after serious driveshaft tech. No recommendations for a one piece shaft. 2 piece rear driveshaft in an '86 hilux. Now correct me if i'm wrong, but the theory behind the two piece is to act as a 'double cardan', only with the trunions spaced out over the distance to the centre bearing. No manual states the correct phases for the ears of the flanges - as to how they line up or how straight the total assembly is to be. common sense has told me to set up the ears for the front half to act as the double cardan (to create the equal accell and decell speeds in the trunion bearings), got the shafts as inline as possible by lowering the centre bearing a bit, but have yet to parallel the flanges - tcase to diff pinion - with some caster wedges.
Q1: is the centre bearing height critical to vibes, or is it there to help position the output flange for the 'double cardan' effect?
Q2: does the front uni joint require any vibe compensation (accell and decell balancing) or does the centre bearing stabilise the rotating assembly by the flexible nature of it's mounting (isolating rubber bush between bearing and mount)
I will get a custom shaft made (thick wall) for the rear, with a longer spline/overall length to account for the rear diff back mod. This way I will have a reliable heavy duty shaft for trail use, and can still use a cheaper standard length shaft as a spare.
Q1: is the centre bearing height critical to vibes, or is it there to help position the output flange for the 'double cardan' effect?
Q2: does the front uni joint require any vibe compensation (accell and decell balancing) or does the centre bearing stabilise the rotating assembly by the flexible nature of it's mounting (isolating rubber bush between bearing and mount)
I will get a custom shaft made (thick wall) for the rear, with a longer spline/overall length to account for the rear diff back mod. This way I will have a reliable heavy duty shaft for trail use, and can still use a cheaper standard length shaft as a spare.