Unrelated comment, but holy shit I am a huge fan of the M8. So wild to see you on Lemmy, and this comment section is exactly what I’m here for.
Comment on Behold The Hyundai Uni Wheel. Transportation May Never Be The Same
trash80@lemmy.dbzer0.com 11 months agoThis mechanism does not allow angular deflection between the motor and hub, as it’s shown, without a CV joint. Lateral displacement, yes, but not angular - as in it can’t steer.
The axis of the motor doesn’t need to be parallel to the axis of the wheel.
If the axis of the motor is vertical, you could use a ring and pinion gear to transfer the torque to the driveshaft running out to the wheel, and have the steering wheels pivot around the axis of the motor.
dubble_deee@lemmy.world 11 months ago
trash80@lemmy.dbzer0.com 11 months ago
TIL there is a musician with the moniker of Trash80… en.wikipedia.org/wiki/Trash80
Sorry to disappoint, but I picked my username because of the TRS-80.
techland.time.com/2012/08/03/trs-80/
Please Don’t Call It Trash-80: A 35th Anniversary Salute to Radio Shack’s TRS-80
BearOfaTime@lemm.ee 11 months ago
But you need a CV or Universal on that drive shaft to accommodate suspension travel (or steering if needed on that wheel).
trash80@lemmy.dbzer0.com 11 months ago
What for? The axis of the driveshaft would always be parallel to the axis of the wheel and perpendicular to the axis of the motor.
Look at this hand drill:
The hand crank is the electric motor. If you rotate the drill about the hand crank axis, you don’t change any angles between the drivetrain components and don’t need CV or universal joints
BearOfaTime@lemm.ee 11 months ago
Suspension movement still requires flex in the shaft. There’s no way around it unless the engine moves with the suspension
trash80@lemmy.dbzer0.com 11 months ago
There’s no way around it unless the engine moves with the suspension
Yes, there is.
Take a conventional front engine, rear wheel drive drivetrain. Rotate the drive train 90 degrees about the rear axle, as if the automobile has its nose in the air, with the driveshaft oriented vertically.
You can steer the vehicle by rotating the entire axle around the axis of the driveshaft, though it isn’t perfect or space efficient, it would require no universal or CV joints. It would behave sort of like a vehicle with an articulated frame.
The axle could be fixed vertically with uni wheels at the ends of the halfshafts allowing the wheels to travel vertically independent from the axle.
Do you understand so far?
snooggums@kbin.social 11 months ago
Now imagine there is a handle sticking out of the crankshaft that needs to rotate around the shaft with the hand crank as it gets turned. That is the motor.
The video never showed the motor moving along with wheels turning, only the up and down part. In fact, when they showed space savings they showed the motors as stationary with no clear way to turn.
trash80@lemmy.dbzer0.com 11 months ago
Now imagine there is a handle sticking out of the crankshaft that needs to rotate around the shaft with the hand crank as it gets turned. That is the motor.
What are you referring to as the crankshaft?
barsoap@lemm.ee 11 months ago
With how small the motor is you could also pivot it alongside with the wheel, after all, something pivoting with the wheel doesn’t mean that it has to be unsprung.
XeroxCool@lemmy.world 11 months ago
The steering wheels’ hubs rotate in two directions. The steering action rotates through a vertical axis while the typical suspension rotates in a front-to-back axis pinned approximately through the other side of the car. So unless they abandoned common suspension design to let tires lean in turns more than a reasonable amount, there needs to be an allowance for angular deflection. A pinion gear arrangement sounds like it would take up a lot of the space they’re trying to save but still not solve the multi-axis problem found at all 4 wheels. I’m trying to not take their video so literally but it’s not like it’s a dealership rep spouting incomplete info here