| 摘要 |
PURPOSE: A radiator having improved cooling water charge function is provided to exclude a spring by using a plastic float, to improve plasticity by using a plastic material, to reduce the production cost by excluding a sealer, and to prevent damage on a radiator by directly inducing cooling water when vacuum pressure is generated in the radiator. CONSTITUTION: A radiator cap(3) is mounted on a neck part(2) of a radiator upper tank(1) to tightly close the radiator upper tank. The radiator cap has a pressure valve(5) supported on a compression spring(4) rebounding in the direction resistant to the internal pressure. The pressure valve is adhered to a valve seat(6) to isolate the inside of the upper tank from the outside. A vacuum valve(7) installed in the center of the pressure valve comprises a shaft part(8) and upper and lower valve members(9,10). Valve seats(11,12) are opened and closed selectively. The vacuum valve is formed by injecting plastic. According to the specific gravity lower than that of the cooling water, the vacuum valve floats on the surface of the cooling water.
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