Spur gear transmission with at least two toothed spur gears (1, 2), the toothings of which are in meshing engagement with each other and which are each rotatable via an axis of rotation (3, 4); 1.1 with a covering wall which surrounds the two spur gears (1, 2) in the circumferential direction and in the direction of the axes of rotation (3, 4); wherein 1.2 the covering wall has an inner contour which is adapted to the outer diameters of the spur gears (1, 2) in such a manner that two annular gaps (6, 7) which merge into each other are produced between the covering wall and the spur gears (1, 2), wherein one annular gap (6, 7) is arranged at least substantially concentrically with respect to each axis of rotation (3, 4); wherein 1.3 the covering wall surrounds the two spur gears (1, 2) in the circumferential direction only over a part of the circumference thereof such that a part of the outer circumference of the two spur gears (1, 2) or of at least one of the two spur gears (1, 2) protrudes outward out of the covering wall; wherein part of the two spur gears (1, 2) or of the one spur gear (1, 2) which protrudes out of the covering wall is positioned on the lower side of the spur gears (1, 2); wherein the covering wall has cooling, in particular cooling bores for the passage of a cooling medium, surface-increasing ribs on the outer side and/or a cooling medium sprinkling device; characterized in that, by means of the cooling of the covering wall, a greater heat flow is removed from the spur gears (1, 2) and/or the toothing thereof than with a lubricating medium flow, in particular lubricating oil flow, with which the meshing engagement of the toothing is lubricated and which is conducted through the annular gaps (6, 7). 1.1 with a covering wall which surrounds the two spur gears (1, 2) in the circumferential direction and in the direction of the axes of rotation (3, 4); wherein 1.2 the covering wall has an inner contour which is adapted to the outer diameters of the spur gears (1, 2) in such a manner that two annular gaps (6, 7) which merge into each other are produced between the covering wall and the spur gears (1, 2), wherein one annular gap (6, 7) is arranged at least substantially concentrically with respect to each axis of rotation (3, 4); wherein 1.3 the covering wall surrounds the two spur gears (1, 2) in the circumferential direction only over a part of the circumference thereof such that a part of the outer circumference of the two spur gears (1, 2) or of at least one of the two spur gears (1, 2) protrudes outward out of the covering wall; wherein part of the two spur gears (1, 2) or of the one spur gear (1, 2) which protrudes out of the covering wall is positioned on the lower side of the spur gears (1, 2); wherein the covering wall has cooling, in particular cooling bores for the passage of a cooling medium, surface-increasing ribs on the outer side and/or a cooling medium sprinkling device; characterized in that, by means of the cooling of the covering wall, a greater heat flow is removed from the spur gears (1, 2) and/or the toothing thereof than with a lubricating medium flow, in particular lubricating oil flow, with which the meshing engagement of the toothing is lubricated and which is conducted through the annular gaps (6, 7).