Abstract: A reserve tank has a tank body integrally formed with a fan shroud with an opening portion and a cover member for covering the opening portion of the tank body. The inside of the tank body is shaped such that a molding die for forming the inside of the tank body can be removed through the opening portion when the tank body is integrally formed with the fan shroud by an injection molding method. The tank body has a concave part around the opening portion and the cover member has a projection for fitting into the concave part to provide a sealing structure. Accordingly, the reserve tank is integrated with the fan shroud without deteriorating moldability and with sealing reliability.

Abstract: An axial flow fan device capable of reducing the stagnant flow at the root area of blades. These blades 18 are arranged so that they extend radially from a boss portion 14 so that they are circumferentially spaced along the circumference of the boss portion 14. Each of the blades 18 has an arc shaped cross section having a bending ratio value .alpha., that is a ratio of the bending height h of the arc shape to the length l of the chord of the arc shape. The value of the bending ratio rapidly increases from the middle portion of the blade to the root portion. The value of the bending ratio at the root portion is about 12%.