MECHANICAL COMBUSTION-ENGINE-DRIVEN FLUID PUMP

摘要

The invention refers to a mechanical combustion-engine-driven fluid pump (10) comprising an input shaft (20) which is directly driven by the combustion engine (12), a pumping unit (18) with a pump rotor (19), and a clutch (16) between the input shaft and the pump rotor, the clutch comprises an input clutch body (24) and an output clutch body (22) and transfers the rotation of the input clutch body to the output clutch body in the engaged clutch state. The clutch is a combined magneto-rheological eddy-current clutch. The clutch comprises a closed clutch liquid gap (26) between the two clutch bodies, the clutch liquid gap being filled with a magneto-rheological clutch liquid (28), an electroconductive element (50) co-rotating with the output clutch body, and a shiftable permanent magnet element (30) being provided co-rotating with the input clutch body. The shiftable permanent magnet element is shiftable between an engaged position wherein the permanent magnet element's magnetic field penetrates the clutch liquid gap with high magnetic flux and the permanent magnet element is close to the electroconductive element, and a disengaged position wherein the magnet element's magnetic field penetration flux in the clutch liquid gap is less than in the engaged position and the permanent magnet element is remote from the electroconductive element. An actuator (42) is provided for moving the permanent magnet element between its engaged and its disengaged position.