Internal Combustion Engine

Abstract

The invention concerns an internal combustion engine in which, instead of conventional valves, a rotary slide valve ( 1 ) for opening and closing at least one gas exchange opening is assigned to each cylinder ( 33, 34 ). The rotary slide valve ( 1 ) is provided in the form of a double-walled tube with two channels ( 40, 44 ), which are separated from one another, for leading away exhaust gases and for supplying air or a fuel vapor mixture, whereby the channels are provided with radial channels ( 41, 42, 38, 45, 46 ) that directly lead to openings on the outer lateral surface of the rotary slide valve ( 1 ) and, depending on the rotational position, connect one or more of the cylinders ( 33, 34 ) to the intake or exhaust channels ( 10, 11 ). In order to obtain a reliable sealing and to prevent the rotary slide valve ( 1 ) from bending, the invention provides that, on the side opposite a channel ( 36 ) of a cylinder ( 33, 34 ), a pressure plate ( 6 ) is retained in a manner that enables it to be displaced in an axial direction of the cylinder ( 33, 34 ) inside a cylindrical space ( 50 ) of the cylinder head ( 2 ). The end of the cylindrical space ( 50 ) facing away from the rotary slide valve ( 1 ) is, via a pressure channel ( 15, 17, 20 ) leading through the cylinder head ( 13 ), connected to the area of the cylinder ( 33, 34 ) opposite the pressure plate ( 6 ), this area adjoining the cylinder head ( 13 ).

1 . An internal-combustion engine with at least one cylinder ( 33  and  34 ), a movable piston, the cylinder ( 33  and  34 ) of which is covered by a cylinder head ( 13 ) provided with intake ports and exhaust ports ( 10 ,  11 ), at which a rotary slide valve ( 1 ) for opening and closing of at least one gas exchange opening per cylinder ( 33  and  34 ) is provided, the rotary slide valve ( 1 ) being designed as a double-walled tube with two passages  8  ( 40 ,  44 ) separated from each other; the inner cylindrical passage ( 40 ) of the tube being particularly provided for discharging exhaust gases and the shell passage ( 44 ) particularly being provided for supply of air or a fuel/vapor mixture, the passages ( 40 ,  44 ) being provided with radial passages ( 41  and  42  and  38 ,  45  and  46 ) leading directly to openings in the outer shell surface of the rotary slide valve ( 1 ) and connecting, depend on their turned positions, one or several of the cylinders ( 33  and  34 ) with the intake or exhaust ports ( 10 ,  11 ) and furthermore the rotary slide valve ( 1 ) being rotatably mounted in a chamber ( 30 ) of the cylinder head ( 13 ) which is basically perpendicular to the axis of the at least one cylinder ( 33  and  34 ) with one passage ( 36 ) per cylinder ( 33  and  34 ) end in this chamber, 
     characterized in that a pressure plate ( 6 ) abutting the rotary valve ( 1 ) with its surface is moveably mounted in axial direction of the cylinder ( 33  and  34 ) in a cylindrical chamber ( 50 ) of the cylinder head ( 2 ) on the side of the chamber ( 30 ) opposite a passage ( 36 ) of a cylinder ( 33  and  34 ), the end turned away from the rotary slide valve ( 1 ) of the cylindrical chamber ( 50 ) being connected to the area adjacent to the cylinder head of the cylinder situated opposite of the pressure plate ( 6 ) by means of a pressure passage ( 15 ,  17 ,  20 ) running through the cylinder head ( 13 ). 
   
   
       2 . The internal-combustion engine according to  claim 1 , characterized in that the pressure passage ( 20 ) is filled with a fluid, e.g. with oil and in that a membrane is provided at the entrance of the pressure passage ( 20 ) on the side of the cylinder. 
   
   
       3 . The internal-combustion engine according to  claim 1 , characterized in that the rotary slide valve ( 1 ) can be driven intermittently, preferably by means of a Geneva movement, so that the turning positions of a radial passage ( 41  and  42 ,  45  and  46 ) also directed at a cylinder opening are preserved with full cross section for pre-selectable time intervals. 
   
   
       4 . The internal-combustion engine according to  claim 1 , characterized in that at least the inner passage ( 40 ) is formed by a ceramic tube. 
   
   
       5 . The internal-combustion engine according to  claim 1 , characterized in that the cylinder head ( 13 ) is designed in two parts, the chamber ( 30 ) for holding the rotary slide valve ( 1 ) being formed by depressions having a semicircular profile.