Cooling system for internal combustion engine and thermostat device

Abstract

A cooling system for an internal combustion engine includes a thermostat device including: a first inflow port connected with a second outflow passage; a second inflow port connected with a third outlet passenger; a valve controlling a flow rate of the coolant from the radiator, a thermostatic element that opens and closes the valve according to a temperature of the coolant; an outflow portion through which the coolant flows to the internal combustion engine; a guide portion that guides the coolant flowing through the second inflow port toward the thermostatic element; a slit flowing out the coolant to the outflow portion from between the guide portion and the thermostatic element; and an electric water pump configured to circulate a coolant.

What is claimed is: 
     
         1 . A cooling system for an internal combustion engine comprising:
 a radiator connected with the internal combustion engine via a first outflow passage;   a thermostat device connected with the radiator via a second outflow passage, connected with the internal combustion engine, the thermostat device being connected with the first outflow passage via a third outflow passage,   the thermostat device including
 a first inflow port connected with the second outflow passage, 
 a second inflow port connected with the third outflow passage, 
 a valve controlling a flow rate of a coolant from the radiator, 
 a thermostatic element that opens and closes the valve according to a temperature of the coolant, 
 an outflow portion through which the coolant flows to the internal combustion engine, 
 a guide portion that guides the coolant flowing through the second inflow port toward the thermostatic element, and 
 a slit flowing out the coolant from between the guide portion and the thermostatic element to the outflow portion; and 
   an electric water pump configured to circulate the coolant.   
     
     
         2 . The cooling system according to  claim 1 , wherein the electric water pump is provided such that the coolant from the outflow portion of the thermostat device flows into the electric water pump. 
     
     
         3 . The cooling system according to  claim 1 , wherein
 the thermostat device includes a coil spring that biases the valve to close, and a frame supports a lower end portion of the coil spring, and   the slit is provided on the frame.   
     
     
         4 . The cooling system according to  claim 2 , wherein the thermostat device is mounted on upper portion of the electric water pump. 
     
     
         5 . A thermostat device for being provided in a cooling system that cools an internal combustion engine,
 the cooling system including
 a radiator connected with the internal combustion engine via a first outflow passage, 
 a thermostat device connected with the radiator via a second outflow passage, connected with the internal combustion engine, the thermostat device being connected with the first outflow passage via a third outflow passage, and 
 an electric water pump configured to circulate a coolant, 
   the thermostat device comprising:
 a first inflow port connected with the second outflow passage; 
 a second inflow port connected with the third outflow passage; 
 a valve controlling a flow rate of the coolant from the radiator; 
 a thermostatic element that opens and closes the valve according to a temperature of the coolant; 
 an outflow portion through which the coolant flows to the internal combustion engine; 
 a guide portion that guides the coolant flowing through the second inflow port toward the thermostatic element; 
 a coil spring biasing the valve to close; and 
 a frame supporting a lower end portion of the coil spring, having a slit that flows out the coolant from between the guide portion and the thermostatic element to the outflow portion.