Cylinder heads for internal combustion engines

Claim 1

AN AIR-COOLED CYLINDER HEAD OF BOX-LIKE FORMATION COMPRISING A BASE PLATE IN WHICH ARE PROVIDED AN INLET AND AN EXHAUST PORT, AN UPPER PORTION CONSTITUTING A ROCKER BOX, CONNECTING WALLS RIGIDLY LINKING SAID BASE PLATE AND UPER PORTION, THERE BEING INTAKE AND EXHAUST CHANNELS PROVIDED IN SAID WALLS AND COMMUNICATING WITH SAID PORTS, SAID BASE PLATE, SAID ROCKER BOX AND SAID CONNECTING ALLS FORMING TOGETHER AN INTEGRAL STRUCTURE AND DEFINING A CENTRAL COOLING AIR CHANNEL EXTENDING FROM A POINT NEAR THE CENTER OF SAID CYLINDER HEAD TO A COOLING AIR OUTLET SIDE OF SAID CYLINDER HEAD, SAID HEAD COMPRISING FURTHER AN AUXILIARY COMBUSTION CHAMBER HAVING A LOWER FACE, THERE BEING A COUNTERFACE ON SAID BASE PLATE, MEANS FASTENING SAID CHAMBER WITH ITS LOWER FACE DETACHABLY IN CONTACT WITH THE CONTERFACE ON SAID BASE PLATE, SAID LOWER FACE LYING ON A COOLING AIR INLET SIDE OF SAID HEAD, SAID LOWER FACE HAVING AN AREA WHICH IS A SMALL FRACTION OF THE WHOLE OUTER SURFACE OF SAID AUXILIARY COMBUSTION CHAMBER, GUIDE WALLS ON SAID INLET SIDE OF SAID HEAD, SAID GUIDE WALLS BEING IN SPACED RELATIONSHIP WITH THE WHOLE OUTER SURFACE OF SAID AUXILIARY COMBUSTION CHAMBER AND PARTIALLY SURROUNDING SAID AUXILIARY CHAMBER, SAID GUIDE WALLS BEING INTERGRAL WITH SAID CONNECTING WALLS AND EXTENDING IN THE DIRECTION OF THE INCOMING COOLING AIR STREAM, THERE BEING INNER COOLING AIR PASSAGES PORVIDED BETWEEN SAID GUIDE WALLS AND THE WALLS OF SAID COMBUSTION CHAMBER, SAID INNER PASSAGES EXTENDING FROM SAID COOLING AIR INLET SAID OF SAID CYLINDER HEAD TO SAID POINT NEAR THE CENTER OF SAID CYLINDER HEAD AND THUS SURROUNDING SAID AUXILIARY CHAMBER, SAID HEAD COMPRISING FURTHERMORE OUTER SURFACES ON SAID CONNECTING WALLS AND SAID GUIDE WALLS, SAID OUTER SURFACES FORMING PARTS OF THE WALLS OF OUTER COOLING AIR CHANNELS WHICH EXTEND FROM SAID COOLING AIR INLET SIDE OF SAID HEAD TO SAID COOLING AIR OUTLET SIDE OF SAID HEAD, SAID INNER PASSAGES HAVING A LOWER PORTION AND AN UPPER PORTION, SAID LOWER PORTION CONSTITUTING A COOLING AIR DUCT EXTENDING FROM SAID COOLING AIR INLET SIDE OF SAID BASE PLATE OVER THE SURFACE OF SAID BASE PLATE NEAR SAID CONTERFACE AROUND SAID CHAMBER AND COMMUNICATING WITH SAID CENTRAL CHANNEL, SAID UPPER PORTION LYING IN THE VICINITY OF SAID ROCKER BOX, SAID GUIDE WALLS HAVING LATERAL OPENINGS ONLY IN THE VICINITY OF SAID ROCKER BOX, SAID OPENINGS CONNECTING SAID UPPER PORTION WITH SAID OUTER CHANNELS, MEANS FOR DIRECTING AN UPPER PART OF SAID INCOMING COOLING AIR STREAM WHICH FLOWS THROUGH SAID UPPER PORTION OF SAID INNER PASSAGES TO FLOW CHIEFLY FROM SAID UPPER PORTION THROUGH SAID OPENINGS INTO SAID OUTER COOLING AIR CHANNELS, MEANS FOR DIRECTING A LOWER PART OF SAID INCOMING COOLING AIR STREAM WHICH FLOWS THROUGH SAID LOWER PORTION OF SAID INNER PASSAGES TO FLOW CHIEFLY FROM SAID LOWER PORTION INTO SAID CENTRAL CHANNEL, AND MEANS FOR COOLING SAID AUXILIARY CHAMBER UNDER THE INFLUENCE OF SAID UPPER AND LOWER PARTS OF SAID INCOMING COOLING AIR STREAM, SAID MEANS FOR COOLING SAID AUXILIARY CHAMBER BEING CONSTITUTED BY FINS PROTRUDING FROM SAID CHAMBER, SAID FINS LYING SUBSTANTIALLY IN PLANES WHICH APPEAR TO BE PERPENDICULAR TO THE CYULINDER AXIS IN A TRANSVERSE SECTION OF SAID HEAD AND APPEAR INCLINED WITH RESPECT TO SAID AXIS IN A LONGITUDINAL SECTION OF SAID HEAD, SO AS TO POINT TOWARDS SAID ROCKER BOX.