In Russia, a rotary-piston internal combustion engine with intermittent rotor rotation has been patented. The developers abandoned complex eccentric assemblies and unbalanced mechanisms in the unit.
The design is based on a round housing with four vane-pistons mounted in pairs with a 180-degree offset on two supporting discs. They form four working chambers in which the intake, compression, power, and exhaust strokes occur simultaneously.
Each disc is located on its own shaft. The shafts are connected to the control and power take-off mechanism through a system of output and synchronizing gears. This arrangement ensures coordinated piston movement and stable force transmission.
Unlike previous solutions, the new engine uses a ratchet gear and locking "pawls" to control rotation. This makes it possible to set intermittent rotor motion without complex lever systems and four-bar linkages.
Valve timing is performed using curvilinear protrusions on the rotor. They open and close the intake and exhaust valves at precisely the required moments of the cycle. At the same time, the ignition protrusion sequentially sends impulses to the spark plugs.
In one full rotor revolution, the engine performs four working cycles and returns to its initial position. At the same time, oscillatory power is taken from one shaft, and rotational power from the other.
The authors of the development emphasize that the design practically lacks parts with eccentricity. This reduces vibrations, improves smoothness of operation, and increases the unit's service life.