Abstract: A controllable coolant pump of internal combustion engines, including a pump housing, a drivable pump shaft rotatably in the pump housing, an impeller fixed on a free end of the pump shaft, and a pressure-difference-driven actuator to drive at least one piston rod guided in a piston rod bore of the pump housing, which includes a control spool at the impeller-side end of the piston rod, and which is guided in the piston rod bore by a guide bushing which is a portion of a sealing device which seals off a pump space carrying coolant with respect to the pressure-difference-driven actuator. The sealing device includes two seals which are spaced apart from one another, are on one end of the guide bushing, and include a static sealing area surrounding the guide bushing on the circumferential side and a dynamic sealing area adjoining the static sealing area.

Abstract: A controllable coolant pump of internal combustion engines includes a pump housing, a drivable pump shaft rotatably mounted in the pump housing, an impeller non-rotatably fixed on a free end of the pump shaft, and a pressure-difference-driven actuator to drive at least one piston rod which is guided in a piston rod bore of the pump housing and includes a control spool valve held at the impeller-side end of the piston rod. The control spool valve is set up to variably cover an outflow region of the impeller. The piston rod is guided in the piston rod bore by a guide bushing which is a portion of a sealing device which seals off a pump chamber carrying the coolant with respect to the pressure-difference-driven actuator.

Abstract: An electrical screw spindle coolant pump is suitable for conveying a coolant circuit or other corrosive, liquid media. The electrical screw spindle coolant pump has a spindle housing with a spindle chamber and an axially adjacent motor housing. The motor housing has a motor chamber, in which a dry-running electric motor is arranged separated from the flow current. The motor housing has a thermal transition portion through which the flow current flows. The thermal transition portion is arranged between the motor chamber and a component boundary of the motor housing to the spindle housing.