| 摘要 |
<p>The apparatus serves to pass an arbitrary pressure medium from a stationary housing (1) to a rotating shaft (4) provided with supply bores (3) in such a manner that there is little leakage or noise and the apparatus is ventable. Sliding pads (8) rest on a lateral contact face (12) of an indexing ring (13) rotating with the shaft (4) and axially displaceable thereon. The sliding pads (8) are supported in an axially displaceable manner on hollow pistons (7) secured to the housing (1). The indexing ring (13) has pins (19) for guiding and coupling it, which are supported in axial bores (21), provided with springs (22), of a shaft ring (16) secured on the shaft (4). The indexing ring (13) has axial check valves (23), each having a valve plug (25) whose end face (29) is located in the plane of the contact face (12) of the indexing ring (13) for the sliding pads (8). The valve chambers (30) of the check valves (23) are connected via bores (32) with discharge points in the other lateral face (14) of the indexing ring (13), opposite which are sealing faces (15) of the shaft ring (16) which communicate via bores (18) with the supply bores (3) of the shaft (4). In the pressurized state, the sliding pads (8) rest on the contact face (12) of the indexing ring (13), pressing it against the shaft ring (16) and carrying the pressure medium into the shaft (4). In the unpressurized state, the indexing ring (13) lifts up from the shaft ring (16) and ventilates the rotating parts. Because of the smoothness of the end faces (29) of the valve plugs (25) and of the contact face (12) of the indexing ring (13) for the sliding pads (8), there are no compression losses and thus no noise or leakage occurs.</p> |
