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> BYD builds a unit with an integrated motor, differential, axle, and wheel hubs So wait, the whole axle is solid then? Like a 1960s pickup truck but with all
by ErroneousBosh 5mo ago
> BYD builds a unit with an integrated motor, differential, axle, and wheel hubs
So wait, the whole axle is solid then? Like a 1960s pickup truck but with all the weight of the motor and gearbox hanging off it too?
That must give it ridiculous unsprung weight.
- serf 5mo agoit's not really like a 'live axle' from an older truck, it's more like a de-Dion style suspension (or dead axle). https://en.wikipedia.org/wiki/De_Dion_suspension https://en.wikipedia.org/wiki/De_Dion_suspension you still see these in velocipede-style vehicles commonly. and to your point : a dead axle is an effort to reduce unsprung weight compared to a live axle; it also lets you actually use alignment as a remediation for asymmetry issues rather than just pre-delivery straightening.
- ErroneousBosh 5mo agoAh, like on my old Volvo 340 ;-) They were fun, all that weight at the back (the diff and gearbox were bolted together under the rear floor) gave it excellent balance. Bit of a shame all that 50/50 weight distribution was only pushed along by a 1.4 Renault engine then, I guess. Have you ever seen the Jaguar IRS setup? It's more like a twin-wishbone suspension *but the driveshaft is the upper link!* It's in compression and stops the hub tilting out, and the rear brakes are inboard to reduce weight even further.
- numpad0 5mo agoLooks like they do in-hub motor for buses and in-differential(like everyone else) for passenger cars?
- sephamorr 5mo agoOn the platforms I've worked with, the weight isn't the issue so much as the quantity of expensive and vibe sensitive parts that are unsprung.