Spur gear transmission

A spur gear transmission, comprising:

• at least two toothed spur gears rotatably disposed about a respective axis of rotation and having toothings in meshing engagement with one another, each said spur gear having a given outer diameter;
• an enveloping wall at least partially enclosing said two spur gears in a circumferential direction and in a direction of the axis of rotation;
• said enveloping wall having an inner contour adapted to the given outer diameters of said spur gears, forming two ring-shaped gaps between said enveloping wall and said spur gears that merge into one another, with each said ring-shaped gap being arranged at least substantially concentrically with respect to a respective said axis of rotation;
• a lubricating device configured to conduct a lubricant flow into said toothings of said spur gears;
• and
• a cooling device configured to conduct a coolant flow through one or more cooling ducts running within said enveloping wall and/or along an outside of said enveloping wall.