Gear machine with a different from the circular low pressure port

The invention relates to a gear unit with two outer engagement meshing gears (50) which are surrounded by a housing having opposite a high and a low pressure port (33). According to the invention an imaginary boundary line (80) two toothed wheels (50) on the inner peripheral surface of the housing associated with that intersects the end (65) of the Druckausgleichsfase (64), wherein they (parallel to the line of contact (83) between the tooth tips (56) of the gears 50) and the inner peripheral surface (31), wherein the cutting edge (85) between the two boundary lines (80) is disposed, wherein the minimum distance (81) between the cutting edge (85) and the boundary lines (80) at least one pitch of the gears (50), wherein the cross-sectional shape of the low pressure port (33) in such a manner deviating from the circular shape, that its the Zahnrader (50) covering the cross-sectional area (79) is greater than the gears (50) covering the cross-sectional area of ​​an imaginary circular low pressure port (82), having the same minimum distance (81) to the boundary lines (80).