Patent ID: 7404779

Claim:
A planetary transmission for machine tools, the planetary transmission comprising: a drive shaft that is connected to a sun gear; an output shaft connected to a planetary carrier and mounted over a transmission housing by an external bearing and an internal bearing, both of the external bearing and the internal bearing being separated from one another by a piston ring; an axial bearing; an interior gear which rotates over an interior gear bearing and is located in the transmission housing, an axially displaceable sliding collar; and a lubrication circuit in the transmission; the housing being provided with an oil intake ( 13 ) that is connected to an oil pump located outside the transmission, the oil intake ( 13 ) supplies an oil flow over an oil line ( 16 ) to the external bearing ( 5 ) of the output shaft ( 3 ), the piston ring ( 8 ) is located between the external bearing ( 5 ) and the internal bearing ( 6 ), the oil intake ( 13 ) serves as an oil passage, in which the external bearing ( 5 ) is connected through an oil feeding circuit with the axial bearing ( 9 ), and the axial bearing ( 9 ) is connected with a cavity ( 17 ) in the interior gear bearing ( 11 ), the cavity ( 17 ) is encapsulated through a wall section ( 18 ) of the transmission housing to an existing oil discharge ( 14 ).