Axial through-shaft actuator arrangement

A variably actuatable water pump, comprising:

• a housing having a pump chamber, an inlet leading to the pump chamber and an outlet from the pump chamber;
• a hollow drive shaft extending through the housing from a drive side of the water pump to the pump chamber, with a drive wheel connected to a drive side end of the hollow drive shaft;
• a variable flow impeller assembly located in the pump chamber, including an axially fixed impeller part connected to the hollow drive shaft and an axially movable impeller part, movable relative to the axially fixed impeller part from a first position in which blades connected to one of the impeller parts are exposed, in order to pump coolant from the inlet to the outlet, to a second position in which the blades are covered, in order to prevent pumping of the coolant;
• a cup actuator assembly axially movable on the hollow drive shaft, including an actuator plate, an actuating pin extending through the hollow drive shaft having a first end that is connected to the axially movable impeller part and a second end that is connected to the actuator plate on the drive side, and an actuator connected to the actuator plate that variably displaces the actuator plate in an axial direction of the hollow drive shaft to move the axially movable impeller part, via the actuating pin, between the first and second positions.