WATER SUPPLY PORT STRUCTURE OF RADIATOR

PROBLEM TO BE SOLVED: To easily detach a cap (radiator cap) with a pressure regulating valve. SOLUTION: The present invention is a water supply port structure of a radiator, comprising a water supply port member 20 equipped with a water supply port 66 closed by the cap 22 with a pressure regulating valve and a valve seat 86 arranged at a lower part inside the water supply port 66 and contacting the pressure regulating valve 76 so as to be separated from the valve 76, for supplying cooling water to the radiator. The water supply port member 20 comprises a water-supply passage 50 extending downward from a start-end side opening whose opening edge is the valve seat 86 and communicating with the inside of the radiator, and a pressure regulating passage 52 equipped with a start-end side opening at a portion between the water supply port 66 and the valve seat 86 and extending downward from the opening along the water-supply passage 50 to communicate with the inside of a reserving tank. COPYRIGHT: (C)2010,JPO&INPIT