The automotive differential is something every automobile has: this ingenious mechanism transmits power from the drive shaft at 90° to the driving wheels, while allowing them to rotate at different speeds when the driving conditions call for it, such as during a turn.
This is a motorized model of the most basic kind of automotive differentials, known as the open differential. Unlike most 3D-printable differential models out there, this one is equipped with a hypoid, not bevel, pinion/ring gear pair.
The model is powered by a 6V electric motor equipped with a speed reducer. It requires an external power source, such as four AA batteries in a holder, or an old 6V phone charger with stripped wires.
Please visit http://www.otvinta.com/download09.html for detailed and illustrated assembly instructions.
The pinion needs ample support to ensure smooth meshing with the ring gear. We use Simplify3D and had to add support manually to cover all teeth, No other part needs support beyond the default amount.
You need to print 2 wheels, 2 side gears, 2 spider gears, and 1 of all other parts.
Tutorial: How to Model and Test the Automotive Differential in Blender
We have created a tutorial on how to design the automotive differential in Blender 3D.
Tutorial: How to Model a Hypoid Gear Drive in Blender
We have also created a tutorial on how to design hypoid gears. The Hypoid drive is similar to the bevel drive but the axes of the pinion and gear do not intersect.