- A large cargo trike with a payload capacity of 600 lbs. creates some formidable stresses on the frame. With a front frame that provides step-through access, the driver inadvertently applies lots of twisting and torsion loads on the front end.
- This is due in part to the rigid 3-wheeled chassis, that doesn’t have the side-to-side freedom that a bicycle has.
- Among many improvements we learned from the prototype, going from 1 x 1 to 2 x 2 square steel tubes in the front frame has yielded a much stiffer and stronger frame.
- We also added side plates to create a box beam.
- The box beam is well anchored to the rear flat-bed frame. Step-through frame is essential for easy mount/dismount. The frames have now been powdercoated.
- SHIFT Urban Cargo Delivery in Vancouver, BC is getting the blue, and orange is our default color. Note that just the front frames are color; the rest of the vehicle is black, including the front fork. This affords a nice contrast, and provides companies with an opportunity to use branding colors.
On this version of the Truck Trike, we decided to create bolt-on dropouts for mounting the rear wheels. This renders them replaceable, as we wish to be able to fit different hub motors for research purposes. In this way we can test many different wheel/motor combinations, and only the dropout is changed – no cutting or welding needs to be done.
We’ll be using the same motorcycle level hydraulic brakes, Italian-made Grimeca brand, as when we upgraded the original prototype.
Besides general component assembly, installation of wiring and the rear hydraulic brakes are the last big tasks.