Water pump for vehicle

Abstract

The present disclosure provides a water pump for a vehicle including an impeller with an impeller discharging port configured to pump and discharge coolant, a shroud movably installed to open and close the impeller discharging port, a first pushing unit configured to push the shroud in a direction of opening the impeller discharging port, and a second pushing unit configured to push the shroud in a direction of closing the impeller discharging port.

What is claimed is: 
     
         1 . A water pump for a vehicle, comprising:
 an impeller with an impeller discharging port that is configured to pump and to discharge coolant;   a shroud movably installed and configured to open and to close the impeller discharging port;   a first pushing unit configured to push the shroud in a direction of opening the impeller discharging port; and   a second pushing unit configured to push the shroud in a direction of closing the impeller discharging port.   
     
     
         2 . The water pump for the vehicle of  claim 1 , wherein:
 a drive shaft is provided in the impeller; and   a pulley is connected with the drive shaft.   
     
     
         3 . The water pump for the vehicle of  claim 2 , wherein the shroud is movably installed in an axial direction along the drive shaft. 
     
     
         4 . The water pump for the vehicle of  claim 1 , wherein the first pushing unit comprises a spring disposed between the impeller and the shroud. 
     
     
         5 . The water pump for the vehicle of  claim 1 , wherein the second pushing device comprises:
 a wax connected with the shroud through a pushrod, the wax configured to expand or contract depending on a heat amount; and   a heater selectively configured to supply heat to the wax.   
     
     
         6 . The water pump for the vehicle of  claim 5 , wherein the heater is connected to an engine control unit and controlled by an operating signal of the engine control unit. 
     
     
         7 . The water pump for the vehicle of  claim 6 , wherein the engine control unit is configured to apply the operating signal to the heater such that the heater heats up the wax when an engine warms up. 
     
     
         8 . The water pump for the vehicle of  claim 6 , wherein the engine control unit is configured to apply the operating signal to the heater corresponding to a rotation speed of the engine, a load, and an ambient temperature.