3 ms·
There is obviously a threshold, that where the unsprung part of the transmission is heavier than the motor itself. That's why brakes are in the wheel and not in
by usrusr 7y ago
There is obviously a threshold, that where the unsprung part of the transmission is heavier than the motor itself. That's why brakes are in the wheel and not inboard working through the axle (which would have to be massively beefed up to handle the enormous braking power). Do they reach that threshold? Probably not, but it's worth noting that they are getting closer and that as a consequence application-specific preference shifts.
- leoedin 7y agoOff topic, but there are a few cars with inboard brakes. The Hummer H1 is one.
- dsfyu404ed 7y agoBecause it has portals at the knuckle and finding a way to put brakes on that without massive rims would result in some janky packaging compromise. Also with the vehicle weight, wheel and tire size they run having the brakes benefit from the portal reduction sure doesn't hurt.
- drewbt 7y agoPerhaps the an in hub motor could be integrated with braking and a KERS system.
- usrusr 7y agoMaximising regenerative braking is always a goal with BEV. If there was a design tradeoff that allowed to somehow massively sacrifice efficiency for very low low specific mass and extreme heat tolerance, we might see the discs replaced with in-wheel "harvesting brakes" in addition to inboard high efficiency cruise motors. But #1 I doubt that kind of tradeoff exists, at least not in sufficient magnitude, and #2 it would probably be quite uneconomic to exploit, lots of lower hanging fruits to pick first.