Rotary piston internal combustion engine

Details Rotary piston internal combustion engine Rotary piston internal combustion engine

1992-11-25

1994-10-25

Koczo, Michael

Internal-combustion engines

Rotary

With compression volume means in uninterrupted communication...

123229, 123232, F02B 5300

Patent

active

053579232

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention relates to a rotary piston internal combustion engine as known, for example, from the European patent 0 223 798.
The fundamental principle of the rotary piston internal combustion engine, generically taken into consideration, has a series of advantages, which include not only the out-of-balance-free running of the rotary piston, which is required particularly for high speeds, but also the functionally coordinated size of the working spaces. The peripheral contour of the rotary piston, which in each case is to run out to a sharp edge and produce with these sharp edges a leakproof contact with the other rotary piston, creates difficulties in the case of the known rotary piston internal combustion engine. Moreover, the valve functions present difficulties, since they presume high gas speeds. The periodically changing pressure relationships, moreover, led to pulsations in the combustion chambers, which have a disadvantageous effect on the continuous supplying of expansion gas. The highly inclined contour of the rotary piston, which runs out to a sharp edge, also contributes to these difficulties.


SUMMARY OF THE INVENTION

It is therefore the object of the invention to provide a rotary piston internal combustion engine, which makes a more compact configuration of the rotary, pistons possible and, at the same time, permits the valve openings to be designed with a large area and smoothes the pulsations in the combustion chamber.
Pursuant to the invention, this objective is accomplished by a rotary piston internal combustion engine. The design of at least one rotary piston system with two piston rotors, revolving symmetrically to a common axis, opens up a path to more highly rounded and more compact piston shapes, which produce a whole series of advantages, such as a uniform temperature distribution, a uniform cooling, a more uniform wear at the peripheral surfaces and relatively long sealing gaps, which therefore function like a labyrinth. The effectiveness of the running of the engine is improved significantly by reducing the air pulsation in the combustion chamber, since the amount of gas, expanding per operating cycle, is distributed among two inlet and two outlet cycles. Last, but not least, it is also achieved that the more compact piston shape with predominantly radially directed end surfaces permit simpler valve opening shapes at the control bodies, with which critical flows and high flow losses can be avoided, which result from the high gas velocities when filling and emptying the working spaces of the internal combustion engine.
The design of a piston system as a double piston system furthermore permits this system to transfer the compression as well as the expansion of gases into partial regions of its annular space, so that the other system basically need act only as shut-off piston rotor.
Moreover, the double piston system can be connected by control bodies phasewise, on the one hand, with a discharge duct to the combustion chamber and, on the other, with a hot-gas duct from the combustion chamber, so that a working space with a compressing action is opened up to the combustion chamber between a piston rotor and the shut-off piston at the end of its compression phase and this combustion chamber is provided with compressed gas (compressed air), while on the other side an expansion space between the other piston rotor and the shut-off piston is connected at the start of its expansion phase by way of the control bodies with the combustion chamber and, with that, receives gas under high pressure that is able to work.
The control bodies may comprise lateral rotary disk valves with control openings. In particular, however, the control bodies comprise a hollow hub, which has axially running control slots and carries the piston rotors. The supply or discharge of gas by way of the hollow hub opens the way to simple control openings of large area, the hollow hub acting together with a cylindrical rotary disk valve. When this revolving cylindrical rotary disk valve en

REFERENCES:
patent: 2070631 (1937-02-01), Sunderland
patent: 4487176 (1984-12-01), Kosheleff
patent: 5101782 (1992-04-01), Yang

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