| 摘要 |
The invention refers to a mechanical automotive fluidic pump (10) with a driving means (30) and a pump wheel (88), both being connectable by a hydraulic coupling (60) which is a magneto-rheological coupling (60). The coupling (60) is provided with a rotatable driving clutch element (39, 41) being permanently connected to the driving means (30), a rotatable driven clutch element (29) being permanently connected to the pump wheel (22) and a magneto-rheological liquid (62) filling a working gap (42, 44) between the two elements (29,39,41). According to the invention a magnet arrangement (36) with a permanent magnet (54) magnetically affecting the working gap (42, 44) and with an electromagnet (50) magnetically affecting the working gap (42, 44) are provided, whereby the electromagnet (50) is arranged to compensate the magnetic field (70) caused by the permanent magnet (54) in the working gap (42, 44) when the electromagnet (50) is active. If the electromagnet fails, the coupling remains engaged connected so that the coupling is failsafe. |
