Pressure reducer for rotary internal combustion engine

Abstract

A pressure reducer for a rotary internal combustion engine comprises a housing ( 1 ) accommodating a first shaft ( 6 ) and a second shaft ( 8 ) running parallel to each other through the housing ( 1 ), and a first rotor ( 7 ) on the first shaft ( 6 ) and a second rotor ( 9 ) on the second shaft ( 8 ). The first rotor ( 7 ) and the second rotor ( 9 ) are configured in a meshing arrangement, when the first shaft ( 6 ) and the second shaft ( 8 ) rotate in counter direction to each other. The first rotor ( 6 ) comprises several radial extensions ( 10 ) having convex shaped outer flanks ( 11 ), and the second rotor ( 9 ) comprises several radial wings ( 13 ) defining indentations ( 14 ) between two wings ( 13 ) having a concave shaped surface ( 15 ). A pressure expansion chamber ( 17 ) is defined by a volume between a convex shaped flank ( 11 a ) of an extension ( 10 a ) of the first rotor ( 7 ) and a concave shaped surface ( 15 a ) of an indentation ( 14 a ) of the second rotor ( 9 ), such that an outer tip ( 12 a ) of the radial extension ( 10 a ) abuts on the concave shaped surface ( 15 a ) of the indentation ( 14 a ) and an outer edge ( 16 a ) of the indentation ( 14 a ) abuts on the convex shaped flank ( 11 a ) of the extension ( 10 a ). In rotation the tip ( 12 a ) slides over the concave surface ( 15 a ) of the indentation ( 14 a ) and the edge ( 16 a ) of the indentation ( 14 a ) slides along the convex flank ( 11 a ), thereby expanding the volume of the pressure expansion chamber ( 17 ).

1 . A pressure reducer for a rotary internal combustion engine comprising:
 a housing accommodating a first shaft and a second shaft running parallel to each other through the housing,   a first rotor on the first shaft and a second rotor on the second shaft, wherein the first rotor and the second rotor are configured in a meshing arrangement, when the first shaft and the second shaft rotate in counter direction to each other,   the first rotor comprising several radial extensions having non-circular convex shaped outer flanks, and   the second rotor comprising several radial wings defining indentations between two wings having a non-circular concave shaped surface,   
       wherein
 said first and second rotors are arranged in said housing and the non-circular convex shaped outer flanks and non-circular concave shaped surface of the extensions and indentations are configured in such a way that, upon meshing of a said extension in a said indentation a pressure expansion chamber is defined between a convex shaped flank said extension of the first rotor and a concave shaped surface of said indentation of the second rotor, 
 said convex shaped flank of said extension and said concave shaped surface said indentation contacting each other simultaneously upon meshing at only two distinct contact points at an outer tip of the radial extension on the concave shaped surface on the one end and at an outer edge of the indentation on the convex shaped flank of the extension the other end. 
 
     
     
         2 . The pressure reducer according to  claim 1 , wherein the housing comprises an inlet opening culminating in an inlet chamber defined by a convex flank of the first rotor, a concave surface of the second rotor and a first inner surface of the housing. 
     
     
         3 . The pressure reducer according to  claim 1 , wherein on the opposite side of the inlet opening the housing comprises an outlet opening out of an outlet chamber defined by a convex flank of the first rotor and a concave surface of the second rotor and a second inner surface of the housing opposing the first inner surface. 
     
     
         4 . The pressure reducer according to  claim 1 , wherein the housing has a first portion of at least half cylindrical shape housing the first rotor and a second portion of at least half cylindrical shape housing the second rotor, wherein the first portion and the second portion are connected. 
     
     
         5 . The pressure reducer according to  claim 1 , wherein the number of indentations on the second rotor is larger than the number of extensions on the first rotor. 
     
     
         6 . The pressure reducer according to  claim 1 , wherein the first shaft and the second shaft are designed to rotate with different velocity. 
     
     
         7 . The pressure reducer according to  claim 1 , wherein the abutting concave surfaces and convex flanks are lubricated. 
     
     
         8 . The pressure reducer according to  claim 1 , wherein meshing toothed wheels are fixed on the first shaft and on the second shaft for synchronizing the revolting movement of the shafts. 
     
     
         9 . A rotary internal combustion engine comprising the pressure reducer according to  claim 1 . 
     
     
         10 . The rotary internal combustion engine according to  claim 9 , wherein the inlet chamber is connected to a combustion chamber of the engine.