simond
Western Thunderer
Peter,
indeed, didn’t it just! I’d put myself in both categories, but as I said in the original post, this vehicle is well outside my field.
I entirely missed the two longitudinal links connecting the underside of the axle to the chassis rails, which would effectively stabilise the axle fore & aft. Indeed, without shackles at both ends of the leaf springs, the axle would be forced to rotate as it moved up & down relative to the chassis. As these links are more or less in the same plane as the brake pull rods, they will prevent any inadvertent self-servo, or anti-servo action.
The rear axle is apparently pivoted (the UJ effectively forms a ball joint) at the rear of the gearbox. It must therefore move in an arc as it rises & falls, and therefore the springs must not constrain it in the fore & aft direction, so they must have shackles at both ends. The UJ prevents fore & aft movement, and reacts the axle torque under acceleration and braking, and I suspect also establishes the rear roll axis.
Think it all makes sense now.
cheers
Simon
indeed, didn’t it just! I’d put myself in both categories, but as I said in the original post, this vehicle is well outside my field.
I entirely missed the two longitudinal links connecting the underside of the axle to the chassis rails, which would effectively stabilise the axle fore & aft. Indeed, without shackles at both ends of the leaf springs, the axle would be forced to rotate as it moved up & down relative to the chassis. As these links are more or less in the same plane as the brake pull rods, they will prevent any inadvertent self-servo, or anti-servo action.
The rear axle is apparently pivoted (the UJ effectively forms a ball joint) at the rear of the gearbox. It must therefore move in an arc as it rises & falls, and therefore the springs must not constrain it in the fore & aft direction, so they must have shackles at both ends. The UJ prevents fore & aft movement, and reacts the axle torque under acceleration and braking, and I suspect also establishes the rear roll axis.
Think it all makes sense now.
cheers
Simon