Air-cooled cylinder head, in particular for internal combustion engines

Claim 1

AIR-COOLED CYLINDER HEAD FOR AN INTERNAL COMBUSTION ENGINE, IN PARTICULAR AN IN-LINE ENGINE, OF THE OVER-HEAD VALVE TYPE FORMED AS AN INTEGRAL CASTING AT LEAST INCLUDING A CYLINDER HEAD BOTTOM, TWO GAS DUCTS AND COOLING FINS, AND PROVIDED WITH A PAN FORMING A ROCKER ARM CHAMBER AND BEING A PART OF THE INTEGRAL CASTING OR A MOUNTED PART, ON WHICH CYLINDER HEAD AT LEAST TWO SPOTS ESPECIALLY SUBJECTED TO HIGH THERMAL STRESSES AND THEREFORE PREFERABLY TO BE COOLED ARE POSITIONED IN THE MAIN DIRECTION OF THE COOLING-AIR STREAM ONE APPROXIMATELY AFTER THE OTHER, ONE OF SAID SPOTS LYING ABOUT AT THE NARROWEST PASS BETWEEN THE GAS DUCTS AND ANOTHER ONE BEING A PROJECTION FROM THE CYLINDER HEAD BOTTOM, AND WHEREBY BETWEEN THE AFOREMENTIONED PORTIONS AND PARTS THERE ARE ARRANGED CHANNELS FOR COOLING AIR BY WHICH A MAIN COOLING AIR STREAM IS DIVIDED INTO AT LEAST ONE CENTRAL PARTIAL STREAM AND INTO OUTER PARTIAL STREAMS, CHARACTERIZED BOTH IN THAT AT LEAST A PART OF THE CENTRAL PARTIAL STREAM HEATED AT THE FIRST SPOT WHICH IS ESPECIALLY SUBJECTED TO THERMAL STRESSES AND THEREFOR PREFERABLY TO BE COOLED IS BRANCHED OFF AND CONDUCTED OUTWARDLY TO BECOME PART OF AN OUTER PARTIAL STREAM, AND IN THAT AT LEAST A PART OF A COMPARATIVELY COOL OUTER PARTIAL STREAM IS BRANCHED-OFF BEFORE SAID PART BRANCHED-OFF FROM THE CENTRAL PARTIAL STREAM COMBINES WITH SAID OUTER PARTIAL STREAM AND IS CONDUCTED INWARDLY TO INNER COOLING AIR CHANNELS TO BECOME AT LEAST PART OF A CENTRAL PARTIAL STREAM AT A PLACE BEHIND THE BRANCH-OFF OF SAID PART OF THE CENTRAL PARTIAL STREAM, THUS SWEEPING A SECOND SPOT WHICH IS ESPECIALLY SUBJECTED TO THERMAL STRESSES AND THEREFORE PREFERABLY TO BE COOLED.