The pistons are all attached by their connecting rods to a reciprocator which rotates as a result of the movement of the pistons and is itself attached to the crankshaft which rotates in the opposite direction. As the pistons move through their strokes, they also move past the ports, injectors and spark plugs, eliminating the need for valves. It’s a very ingenious arrangement.
The axial engine has a number of interesting features:
- The counter rotating components generate very low vibration
- Only 3 injectors and plugs for 5 cylinders plus no valve train reduces the parts count
- It is designed to run on a wide variety of fuels
- Lighter and more compact than similar displacement conventional engines
Watch the videos to see the internals in motion and how it works and also note the balanced coin on the running engine as it is repeatedly revved.
Source: Duke Engineering