Animated Engines - Gnome Rotary
Here is relative reciprocation (piston moves "up and down"within the cylinder), but no reciprocating parts, yet it retains the closed chamber efficiency of the normal configuration.
The only piston in cylinder design that has the big end of the con rods rotating (versus oscillating) on the crank journal.
The Le Rhone had slipper rods, which oscillated independently around a groove in the master rod.
Ancient designs, preceeding WW1 but unique inthe fact that they are not reciprocating engines. Even the valvespring tension was augumented by the centrifugal force of the rotating block and cylinders around the fixed crank. Originally designed for better lowspeed air cooling they tripled aircraft speed in 4 years. Many thought those g forces would scramble the pilots brain.
In a modern application like my patented drive hydraulic pressure passes through the "journal" to the cylinder chamber area. The con rods are reversed and do not oscillate relative to the pistons, side loads making piston skirts necessary do not exist.
regards
Mech