...
| Expand | ||
|---|---|---|
| ||
The point shown below is the origin of the XV-RSU021-Motor Wheel Assembly, also the same as the origin of the XV-WHE001-Rim in the assmbly  Also, I hope this sketch helps, but from a side view, the circular wheel is ‘centered’ between the top and bottom face of the trailing arm (green), and also centered between the two bolts (red).  Either way, just make sure in your new CAD, the wheel perfectly overlaps with the wheel in the old CAD |
Weight Limitation
The rear hub + trailing arm assembly, in it’s entirety, should not weigh more than the original assembly’s weight with the electric motor.
The final trailing arm assembly (after your rear hub design has been added to the assembly) should not weigh more than the original assembly with a motor, because then it wouldn’t make sense to use it.
You should keep this in mind during your initial design, but do not make it a priority. A lot of mass optimization usually happens during the FEA stage, where you can identify areas of low stress (not worried about it breaking there) and thus you can get rid of some material.
Symmetry
Ideally, the design of the rear hub should allow it to be mounted on either the left or right side trailing arm without any issues.
We are aiming to collect data to help guide our design for MS16. Being able to swap the motor between wheels can help us better understand how our lap times and efficiency are effected by having a motor on different sides of the car (when considering a track with more left or right hand turns). The original motor mount is already symmetrical for both sides. Take a look at how the motor mount attachment to the trailing arm looks right now and try to replicate it.
Degrees of Freedom
The wheel shall only be allowed to spin about the lateral axis, and must be fixed in all other degrees of freedom, relative to the trailing arm
...
| Expand |
|---|
this is complicated we will cover this in a future week 😇 As an estimate, a single rear wheel of the car can experience 1-2kN of force, so that gives you a ballpark of how much force we’re talking about. Anyway, don’t worry about this for now, you need do do concept design and then CAD before we even talk about running sims. |
Performance
The hub
...
should exhibit minimal rotational
...
friction
There should be minimal frictional friction losses that occur just due to the wheel spinning. This is a given, no one likes squeaky wheels.
...