Gear pump

Claim 1

A GEAR PUMP, ESPECIALLY FOR USE AS A PRESSURE PRODUCER IN AUTOMATICALLY SHIFTED CHANGE-SPEED GEARS FOR MOTOR VEHICLES HAVING A HOUSING MEANS INCLUDING AN INLET, AN OUTLET, AND A PUMPING CHAMBER, COMPRISING: AN EXTERNALLY TOOTHED GEAR WHEEL ROTATABLY MOUNTED ECCENTRICALLY OF SAID PUMPING CHAMBER AND AN INTERNALLY TOOTHED GEAR WHEEL SURROUNDING SAID EXTERNALLY TOOTHED GEAR WHEEL WITH A PORTION THEREOF INTERMESHED THEREWITH AND A PORTION THEREOF SPACED THEREFROM, A RELATIVELY FIXED CRESCENT PORTION DISPOSED BETWEEN SAID SPACED PORTIONS OF SAID TWO GEAR WHEELS, PRESSURE SPACE MEANS BETWEEN SAID TWO GEAR WHEELS ADJACENT ONE END OF SAID FIXED CRESCENT PORTION ASSOCIATED WITH THE OUTLET OF SAID PUMP, AND EQUALIZATION CHANNEL MEANS EXTENDING BETWEEN SAID PRESSURE SPACE MEANS AND THE TOOTH GAPS IN THE EXTERNALLY TOOTHED GEAR WHEEL SPACED FROM AND MOVING IN THE DIRECTION TOWARD SAID PRESSURE SPACE MEANS, WHITHC TOOTH GAPS ARE OTHERWISE CLOSED TO SAID PRESSURE SPACE MEANS BY SAID FIXED CRESCENT PORTIONS, THE EQUALIZATION CHANNEL MEANS BEING IN THE FORM OF A GROOVE ARRANGED ON THE INSIDE SURFACE OF SAID FIXED CRESCENT PORTION FACING AND IN COMMUNICATION ONLY WITH SAID PRESSURE SPACE MEANS AND SAID EXTERNALLY TOOTHED GEAR WHEEL, THE EQUALIZATION CHANNEL MEANS BEING IN CONSTANT COMMUNICATION OVER THE ENTIRE LENGTH THEREOF WITH THE TOOTH GAPS PASSING THE SAME AND HAVING A CONSTANTLY DECREASING DEPTH STARTING FROM THE PRESSURE SPACE MEANS AND GOING IN A DIRECTION OPPOSITE THE NORMAL DIRECTION OF ROTATION OF SAID GEAR WHEELS FOR A DISTANCE AT LEST GREATER THAN THE WIDTH OF A TOOTH GAP.