| 主权项 |
1. A regulatable coolant pump of an internal combustion engine, comprising a pump housing in which a pump shaft with an associated impeller is rotatably mounted, that conveys a coolant into an outlet of the coolant pump, a volume flow of the coolant pump being adjustable by a cover that at least one of externally surrounds the impeller at least in some regions or blocks an inlet flow to the coolant pump, the cover is hydraulically displaceable by an actuator between two end positions, the actuator including:
a solenoid in contact with a piston that is moveable into a piston pressure chamber via actuation of the solenoid in order to generate high pressure pulses of a pressure medium, a return spring that acts to return the piston to an initial position, a plunger chamber in communication with the pressure chamber via a communication path in order to receive the high pressure pulse of the pressure medium, a plunger located in the plunger chamber, a check valve located in the communication path to prevent a backflow of the pressure medium from the plunger chamber;wherein the plunger is connected to the cover so that upon actuation of the solenoid, the cover is moved by the pressure medium acting on the plunger to an actuated end position in which the impeller is surrounded at least in some regions or the inlet flow to the coolant pump is blocked. |
