Patent ID: 7438325

Claim:
A rotating passage feed ( 1 ) for connecting, on one side, pressure means conduits ( 17 ) arranged in a shaft ( 3 ) and, on the other side, pressure means connections ( 6 ), through which fluid pressure means are guided, the pressure means conduits and the pressure means connections rotating relative to each other, comprising: a shaft ( 3 ), at least one pressure means conduit ( 17 ) comprising a channel extending axially within the shaft ( 3 ), a radial bore hole ( 22 ) for each of the pressure means conduits ( 17 ) extending from a surface of the shaft ( 3 ) to the pressure means conduit ( 17 ), wherein the bore holes ( 22 ) of the different pressure means conduits ( 17 ) are offset relative to each other in an axial direction, a connecting part ( 5 ), which surrounds the shaft ( 3 ) in a region of the bore holes ( 22 ), wherein the connecting part ( 5 ) comprises a ring groove in a region of each of the bore holes ( 22 ), which completely covers a respective one of the bore holes ( 22 ), so that a ring channel ( 8 ) is produced together with the shaft ( 3 ), a pressure means connection ( 6 ) for each of the pressure means conduits ( 17 ), which is in pressure-tight connection with one of the ring channels ( 8 ) and supplies the respective channel with pressure means, and sealing rings ( 25 ), which seal the ring channels ( 8 ) from each other, a central sleeve ( 9 ) is attached between the connecting part ( 5 ) and the shaft ( 3 ), the central sleeve is connected in a pressure-tight and non-rotatable manner to the connecting part ( 5 ) and has first cylindrical ring sections ( 18 ), having an outer surface provided with ring-shaped openings ( 12 ) spaced regularly in a peripheral direction, the openings ( 12 ) are covered completely by the ring grooves of the connecting part, the first cylindrical ring sections ( 18 ) are separated in the axial direction from each other by second cylindrical ring sections ( 19 ), which have no openings, the radial bore holes ( 22 ) are formed as elongated holes and have a length which is selected so that in each position of the shaft ( 3 ) relative to the central sleeve ( 9 ) at least one opening ( 12 ) is completely aligned with the radial bore hole ( 22 ), and the sealing rings ( 25 ) are attached in recesses in the shaft ( 3 ) and interact with the second cylindrical ring sections ( 19 ) of the central sleeve ( 9 ).