Patent ID: 8807095

Claim:
An engine cooling device comprising: an engine provided with a cylinder block, a cylinder head, and a cooling medium flow passage which is a single system as a whole and which causes a cooling medium to flow from the cylinder block to the cylinder head, wherein the cooling medium flow passage branches into at least two inner paths within the cylinder block, and the inner paths are joined together within the cylinder head, wherein the inner paths that are joined together within the cylinder head are first joined at a joining point that is at an outlet portion of the cooling medium inside the cylinder head, a switching portion that is provided to at least one of the inner paths, and permits or prohibits flow of the cooling medium through based on a pressure of the cooling medium which is a state quantity that is used for estimating an increase in the temperature of the cylinder, the switching portion increases a flow rate of the cooling medium by permitting the flow of the cooling medium, when the state quantity indicates that the temperature of the cylinder head is higher than the first predetermined temperature, a cooling medium pressure-feeding portion to change the flow rate of the cooling medium that is pressure-fed, and a control portion that controls the cooling medium pressure-feeding portion to increase the flow rate of the cooling medium pressure that is pressure-fed as the temperature of the cylinder head increases, based on the temperature of the cylinder head.