Quote:
Originally Posted by navanodd
Makes sense, helical cut gears can generate a lot of axial force.
The primary reason that racing gearboxes use straight cut gears is so that stronger, heavy transmission casings are not required to hold the axial load.
|
Not only that, the really clever bit is that if the worm wheel drives the worm gear it does so in the opposite direction to the applied torque. When that happens the worm gear is generating axial force opposing the axial force that the driving torque applies. The worm gear then moves away from the case allowing it to rotate. When one wheel differentiates in speed it reduces the torque bias force at the worm gear thus allowing the differentiation.
That's why you get no unusual gear wear in a Torsen. When it differentiates it unloads the gears that would otherwise bias the torque. At least, that's how it appears to me now that I think it through to the end. I'm not an engineer.