the longitudinal extent of the motor shaft 11 the inner annular region 30 preferably has an inclination 36 of approximately greater than 5 u00b0 with respect to a radial to the longitudinal extent of the motor shaft 11 a radially circumferential drip edge 32 is formed where the outer annular regions 23 and 31 adjoin one another in the exemplary embodiments of fig4 to 6 the outer diameter 33 of the inner annular region 25 is smaller than the outer diameter 34 of the inner annular region 30 the oil that passes through the filter disks 17 u2032 to 17 u2032 u2033 from the annular depression 27 runs completely on the inner annular region 30 to the motor shaft 12 and along the latter into the interior of the motor housing 10 thus while there have shown and described and pointed out fundamental novel features of the invention as applied to a preferred embodiment thereof it will be understood that various omissions and substitutions and changes in the form and details of the devices illustrated and in their operation may be made by those skilled in the art without departing from the spirit of the invention for example it is expressly intended that all combinations of those elements and or method steps which perform substantially the same function in substantially the same way to achieve the same results are within the scope of the invention moreover it should be recognized that structures and or elements and or method steps shown and or described in connection with any disclosed form.