| 摘要 |
The invention concerns a rotary transmission leadthrough for transferring pressurized working fluid from a stationary machine part (1) to a rotating machine part (2) and/or vice versa, with a housing (11) which is associated with the stationary machine part (1), a shaft (2) which is associated with the rotating machine part and extends into the housing (11) and optionally also through the latter, and with at least one bush (3) which is accommodated in the housing (11), closely surrounds the shaft (2) and is mounted in the housing (11) such that the bush (3) is sealed and can move in a radially resilient manner. The inner surface of the bush (3) and the generated surface of the shaft (2) are equipped with sealing surfaces (38, 28) which slide one on top of the other, and the bush (3) has at least one radial bore (31) which is connected to at least one radial bore (23) in the shaft (2) via a peripheral annular duct (32) on the generated surface of the shaft (2) and/or the inner face of the bush (3) for the passage of pressurized working fluid through the bush (3) to a fluid line (22) which extends axially in the shaft (2) and is connected to the radial bore (23) in the latter. According to the invention, in order to provide a rotary transmission leadthrough which displays the above-mentioned features and permits a further increase in the shaft diameter, the relative speeds of the surfaces sliding one on top of the other and/or the pressures, in particular also changing pressures, at which working fluid can be delivered, a pressure-relief device is provided in that the bush (3) has at least one radial bore (5) which is separate from the fluiddelivery bore (31) and extends to a pressure-relief duct (34) which is formed either on the inner surface of the bush (3) and/or on the outer surface of the shaft (2) and on which pressurized fluid can act. |
