Abstract: A ratio (Nc/Lc), in a condenser core portion, of the number of louvers to a width of a condenser cooling fin, and a ratio (Nr/Lr), in a radiator core portion, of the number of louvers to a width of a radiator cooling fin satisfy that the ratio in one core portion, out of the condenser and the radiator core portions, a required radiation amount of which is larger than that of the other core portion is larger than the ratio in the other core portion. Thus, in the core portion having a small required radiation amount, the number of louvers relative to the width of the cooling fin is small thereby decreasing the heat transfer ratio. However, by this, the air flow resistance in this core portion decreases thereby increasing an air flow amount. Thus, the radiation amount of the core portion of which required radiation amount is large increases.

Abstract: According to the present invention, a first tube is constructed by connecting a plate material into a tubular shape. In the manufacturing process, after an inner fin is disposed around an outer wall of a second tube, the first tube is disposed around the second tube, and the first tube and the second tube are fixed by connecting the plate material in such a manner that the inner fin is in contact with the both tubes. In this way, the inner fin and both tubes are certainly contacted closely to each other without enlarging the second tube.

Abstract: A double heat exchanger includes a radiator having a radiator tank and a radiator core portion, and a condenser having a condenser tank and a condenser core portion. The radiator tank and the condenser tank are integrally connected by a connection portion protruding from the radiator and the condenser tanks toward the radiator and condenser core portions. Therefore, the connection portion is cooled by air passing through the radiator and condenser core portions. Thus, the connection portion restricts heat from the radiator tank from being transmitted to the condenser tank through the connection portion, thereby preventing heat-exchanging capacity of the condenser from being decreased in the double heat exchanger.

Abstract: There is disclosed an aluminum alloy tube whose outer surface is covered with a filler alloy by metal-spraying, wherein the base material of the tube has an uneven rough surface with the depth of 10 &mgr;m or more, and the difference between the highest projection of the base material surface and the highest projection of the filler alloy layer covering it is 3 to 25 &mgr;m; a heat exchanger, which is assembled by using the tubes; and a method of metal-spraying, which comprises metal-spraying an aluminum alloy filler powder in a melted state, by the high-velocity flame metal-spraying process, in which the filler contains 15 to 50% Si by weight, and the powder is mainly made up of particles whose diameter is 10 &mgr;m to 70 &mgr;m. The aluminum alloy tube is excellent in brazability and corrosion resistance, and by using the tube, it is possible to assemble a heat exchanger without allowing locally filler-unbonded parts to be formed.

Abstract: A radiator includes a core portion, a header tank, a side plate attached to the core portion and a bracket through which the radiator is mounted to a vehicle. The bracket is separately formed from the header tank, and is connected to the side plate through a bolt. As a result, the radiator is readily mounted to a vehicle of a different model by only changing an attachment position of the bracket to the radiator, without modifying the header tank. Further, the bracket includes a coolant receiving portion disposed to face a drain outlet of the header tank with a predetermined gap therebetween. Therefore, coolant discharged from the header tank collides with the coolant receiving portion to reduce its dynamic pressure. As a result, coolant drained from the radiator is restricted from being scattered.

Abstract: According to the present invention, a pin-disposed portion where a pin member for mounting a heat exchanger on a vehicle is disposed is structured such that an inner edge shape of a cross section of the pin-disposed portion draws a four-sided closed curved line. The pin member passes through an inner space of the pin-disposed portion and is connected to the pin-disposed portion at plural positions. In this way, the pin-disposed portion constructs a shell structure which is superior in a mechanical strength. Further, because the pin member is connected to the pin-disposed portion at plural positions while passing through the space, the shell structure of the pin-disposed portion can be made more rigid.

Abstract: A first cooling fin and a second cooing fin are separated to have a predetermine clearance, and a plurality of connecting portions for partly connecting the first and second cooling fins are formed. When the first and second cooling fins are unfolded, the length E of each the connecting portion in parallel with the longitudinal direction of the first and second cooling fins is equal to 5% or less of the length F between the adjacent connecting portions. Further, the first cooling fin is projected from the condenser tube toward the radiator tube side with a projection length Lc being in a range of 1.7 to 7.0 mm.

Abstract: A cooling fan apparatus having a cooling fan, a fan shroud and a screen. The screen comprises a bell mouth ring and a screen portion. A bell mouth ring is disposed in front of the fan shroud by a predetermined distance. The screen portion comprises a plurality of rings and a radial grid disposed around the rings at the periphery of the screen.

Abstract: A fan apparatus for preventing the occurrence of a burble on a surface of a blade while the resistance to air flow into the fan is increased and the generated noise is kept small. Each fan of the blade has a first area which extends from the bottom portion of the blade to the intermediate portion and a second area from the intermediate portion of the blade to the top portion of the blade. The setting angle of the blade is a first, predetermined angle at the first area of the blade but is increased at the second area of the blade. Further, the chord length of the blade gradually increases from the bottom to the top of the blade. Additionally, a first wing axis of the blade in the first area is not parallel to a second wing axis of the blade at the second area but, rather, the second wing axis is inclined towards the rotational direction of the fan apparatus.