What specifically, is the design principle behind the Helical shape of gears in a synchromesh transmission?
Are the Helical gear designed, in any known vehicle, to disengage? Is that why the gears are helical? To make the engage/disengage smoother?
As far as I know, the helicals on any synchomesh don't ever disengage. Their linkage with the dog-clutch/blocking ring/mesh cone -- Basically the dog-clutch teeth is the only part that disengages. Once the dog-teeth disengage, that will allow the entire helical to free-wheel on the mainshaft. But the helical teeth NEVER come apart.