Patent ID: 8171896

Claim:
A cooling structure of an internal combustion engine, comprising: a cooling water introducing port provided on one end side of a cylinder block; and a water jacket provided so as to surround a cylinder bore wall, wherein cooling water is introduced from the cooling water introducing port into the water jacket, the cooling water is branched to flow to a portion on an intake side and a portion on an exhaust side of the water jacket of the cylinder block of the internal combustion engine, and the cooling water is supplied from a cylinder block side to a cylinder head side, the cooling structure of the internal combustion engine, further comprising a first regulation portion that regulates a flow of the cooling water supplied to the cylinder head side, wherein the first regulation portion is provided with a first wall portion that divides the flow of the cooling water from the cooling water introducing port between a flow at a portion on the exhaust side and a flow at a portion other than the portion on the exhaust side, and regulates the flow of the cooling water to the portion other than the portion on the exhaust side, and the portion other than the portion on the exhaust side includes a portion on the intake side and a portion on the cylinder head side.