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Abstract
The invention relates to a rotary piston engine having at least two rotary pistons, both being formed as gear wheels mounted in a rotatable fashion on mutually perpendicular axes in a housing providing a closed seal for the pistons on both faces as well as around their circumferences, and being at one point in a sliding, mutually sealing engagement of gear teeth with each other. The following features are proposed according to the invention for a novel engine system:
1. The at least two rotary pistons have different diameters,
2. The teeth forming the individual pistons make contact at an angle of 45 in each case and have slightly helical flanks.
3. The tooth spaces which form chambers for carburetion and compression and the working chamber have an inside contour precisely matching the shape of teeth.
4. Each tooth is assigned a through flow bore, the latter forming a combustion chamber and being incorporated in the rotary piston, which bore opens into an outlet on the circular surface areas of the rotary piston which lie opposite each other, a closed seal being provided through certain angles of rotation for the bore at these points by means of opposing housing walls which enclose one rotary piston in a sandwich arrangement,
5. Ahead of the tooth engagement point lies a first connecting duct for each rotary piston in the aforementioned housing walls. This duct provides a flow connection between the tooth space rotating past it and a throughflow bore and fills the latter with compressed air or a fuel mixture
6. Behind the tooth engagement point lies a second connecting duct for each rotary piston in the aforementioned housing walls, which duct provides a flow connection between the throughflow bore rotating past it and one of the subsequent tooth spaces, into which the charge in the throughflow bore expands.
The aforementioned housing walls incorporate exhaust opening both before and after the tooth engagement point as well as intake opening lying opposite the exhaust opening, with the intake openings being connected to an air intake or a fuel mixture intake, which openings are flow connected in sequences to the tooth spaces passing by.
2.Background
The internal combustion, piston engine has been known long enough for almost all possible variations on it to be tried, yet there are combinations of its various components that are under exploited due to the overwhelming emphasis has placed on shaft power output. This popular emphasis has overshadowed some basic and viable aspects of I.C. engine design that are potentially useful in future products. This is especially true when the favorable economics of modern computer techniques are combined with the most desirable attributes of basic, piston-operated, I.C. Engines.
Introduction
When the digital techniques of almost instantaneous computer control combine with certain aspects of an engine design that has no inertial components, it is fair to call the resulting engine a Digital Engine. Such a 5-Phase Rotary Piston Engine is described here whereby there is no flywheel, crankshaft or connecting rod incorporated in the design. All the power is taken out from the straight piston stroke, which combines the advantages of the 5-phase method with the advantages of a sub fractional horsepower motor.
This is achieved by the creation of numerous small combustion chambers combined with the introduction of a "preparation phase" as a fifth phase. The digital engine therefore offers not only a considerable lengthening of the period available for mixture preparation and combustion but also substantially complete fuel combustion with a very good weight-to-power ratio. The digital engine is suitable for the usage of alternative fuel, especially for the usage of hydrogen.
Objective
The objective of the present invention was to develop a rotary piston engine displaying the advantages of a very low capacity engine, i.e. enabling near-complete fuel combustion and minimizing emissions of exhaust gases.
According to the invention, therefore, the carburetion process is isolated in time and space from the standard processes encountered in conventional internal combustion engines in that a separate carburetion cycle is created. This is achieved by an arrangement of sequentially operating combustion chambers in a rotary piston. During a compression cycle in a tooth space. The compressed medium is pressed into a combustion chamber, which is also incorporated in the rotary piston and subsequently remains closed for the aforementioned carburetion cycle.
The pressure required for the subsequent work cycle is generated by the forward combustion chamber in the rotary piston, in which the entire carburetion process and the combustion process have just been completed. The combustion chambers incorporated in the rotary piston are linked in sequence via ducts formed in the engine housing to working volumes formed by the tooth spaces.
According to the invention, a large number of vary small combustion chambers are therefore created, and at the same time sufficient time and space is provided for carburetion and combustion of the combustible mixture. This improves the energy yield and reduces emissions of harmful pollutants. In terms of design, it is also advantageous that the rotary piston engine according to the invention does not require a crankshaft, connecting rods or valves.
Any type of fuel is suitable for operation of the rotary piston engine according to the invention, in particular hydrogen or alcohol, or fuel mixtures such as naphtha with water. Here it is advantageous if the throughflow bores forming the combustion chambers are equipped with catalysts or inserts for flameless combustion. When using hydrogen, water injection can be utilized, whereas nickel insert is suitable for Water-Water mixture.
In order to extend the service life, it is advantageous if the throughflow bores forming the combustion chambers and possibly also the secondary connecting ducts are coated with a layer of heat insulating material.