Specification for timing belt pulley on large CIM?

What FP product did this motor come off of, and how was it used? I am having trouble visualizing how the assembly would work installed in a power wheels vehicle. It seems if the belt breaks, the metal bar would slam into the
the shaft, and grind a nice groove while placing a no-no side load to the shaft.

Also, I was always taught that belts are fairly inefficient as a method for transferring power, especially for a vehicle. Maybe FIRST got all these motors
because they were recalled!

But that aside, they look like they can do some heavy lifting. Gear these babies right, and you'll be able to launch your entire robot through the center goal.