Abstract: A plurality of angle portions 2c of the fins on an upstream side and those on a downstream side of an air flow are provided so as to be substantially symmetrical with each other. Due to this, bending forces are continuously exerted on a thin plate-like fin material in a direction where the bending deformation of the fin material is cancelled, during the fin forming process. Accordingly, when the angle portions 2c are formed it can be prevented in advance that the fin material 11 is deformed in a state where the repeated deformations of the fin material 11 are accumulated in the same direction.

Abstract: A heat exchanger includes a plurality of flat tubes stacked with each other, and a tank connected at an end of each tubes to communicate with the tubes. The tank includes a tube joint part having a plurality of tube inserting holes, and a plurality of ribs extending in a tube width direction on the tube joint part. The ends of the ribs are positioned outside of the ends of the tube inserting holes. The tube joint part has a deformation allowable portion at an outside of the ends of the ribs so as to allow the tube joint part to be deformed in a tube longitudinal direction. The tube joint part has a plurality of approximately V-shaped cross-sections, in which the tube inserting hole and the rib are provided without a flat face therebetween.

Abstract: A heat exchanger module includes a first heat exchanger disposed at a downstream air side of second and third heat exchangers. In the heat exchanger module, walls are formed in reinforcement plates of the second and third heat exchangers, to be approximately perpendicular to a cooling air flow direction. Further, communication holes through which air passes are provided in the walls of the reinforcement plates. Accordingly, a sufficient amount of air for heat exchange can be supplied to the first heat exchanger, while the second and third heat exchangers can be reinforced enough by the reinforcement plates.

Abstract: A heat exchanger, in which louver wall surfaces (3c) are twisted at a predetermined angle (?1) with respect to a plurality of flat portions (3a) of fins (3) and an inter-louver path (5) is formed between the adjacent louver wall surfaces (3c), is disclosed. The center points (3d) of some louver wall surfaces (31c) are displaced from the center points (3d) of the other louver wall surfaces (32c) along the cooling water flow direction (X1). As a result, the real louver pitch height (HLP) is increased beyond the louver pitch heights (HLP1, HLP2) of the louver wall surfaces (31c, 32c), respectively. Even in the case where the louver width (L) is reduced, therefore, the cooling air can be caught by the louver wall surfaces (3c).

Abstract: A heat exchanger with louvers twisted by a predetermined angle with respect to flat parts of fins and with louver passages formed between adjoining louvers, wherein step differences projecting out to the louver passage side are provided at the louvers. According to this, when cooling air flows through the louver passages, the flow of the cooling air is disrupted by the step differences and temperature boundary layers are destroyed, so the local heat conductivity is again raised at the locations of the step differences.

Abstract: A protruding portion protruding toward the outside a tank is formed on a core plate in a range corresponding to a straight portion of a flat tube inserted and joined to the core plate. Due to this structure, a joining portion of the tube to the core plate is three-dimensionally formed and a joining portion length is extended. Therefore, thermal stress generated in the tube can be diffused from the joining portion of the tube to the core plate.

Abstract: A projection portion (145) protruding from a bottom surface 8141a) on a core portion side towards the center of the core portion (130) is formed in a core plate (140). A bond portion (142a) between a tube (132) and the core plate (140) is arranged closer to the center side of the core portion (130) than the bottom surface (141a) and at substantially the same position in a tube longitudinal direction X with respect to a push surface (143a) of a packing (150). Therefore, even when a load in a direction intersecting at right angles the tube longitudinal direction is applied to a formation portion of a fitting groove portion (143), the occurrence of a bending moment can be suppressed.

Abstract: A heat exchanger has a tank communicated with tubes at longitudinal-direction ends of the tubes. A first plate member of the tank has a core plate portion connected with the tubes and two side wall portions facing each other, which are constructed of a metal plate material. The second plate member of the tank has an opposite wall portion facing the core plate portion and two cap portions facing each other, which are constructed of a metal plate material. The core plate portion has a protrusion-shaped cross section in the longitudinal direction of the tubes. The first plate member and the second plate member are integrated by brazing. An inner surface of one of the plate members contacts an end surface of other of the plate members, and a fillet is formed between an extension portion of the one plate member and a shear droop of the other plate member.

Abstract: A fan shroud 4 is assembled to a cooling module in such a way that the fan shroud 4 covers brackets 3 that have been assembled to the cooling module, that is, a radiator 1 and a condenser 2 and, at the same time, snap fits 3h and a vehicle body prevent the fan shroud 4 from being detached from the brackets 3. In this way, it is possible to easily assemble the cooling module and the fan shroud 4 and, therefore, it is also possible to improve the workability in assembling or disassembling the cooling module and the fan shroud 4.

Abstract: Brackets 3 made of resin are provided between the radiator 1 and the condenser 2, and the heat exchangers 1 and 2 are secured to the brackets 3, so that heat transfer from the radiator 1 to the condenser 2 can be restricted and reduction of the cooling efficiency of the condenser 2 can be prevented. The radiator 1 and the condenser 2 are assembled with and secured to the brackets 3 so that the position of the condenser 2 with respect to the radiator 1 can be easily determined. Therefore, the assembling of the cooling module can be facilitated and no heat exchange between the radiator 1 and the condenser 2 can be restricted due to a predetermined space provided between the core 1c of the radiator 1 and the core 2c of the condenser 2.

Abstract: A heat exchanger with the ends of tubes (10) connected by being inserted into a tank (2) is disclosed. Insertion holes are formed in a protrusion (210) convex outward of the tank (2) along the tube length (X). The junction length ratio B/A is not less than 1.15, where A is the outer peripheral surface length of the tubes (10) and B the peripheral length of the junction between the tubes (10) and the tank (2). The larger the junction length ratio, the more the stress generated in the tubes (10) is distributed and reduced. Especially in the case where the junction length ratio is not less than 1.15, the stress is reduced by one half as compared with the junction length ratio of 1.0.

Abstract: A wave-shaped portion 5b, the profile of which is formed into a wave-shape, is provided on the core plate 5, and tubes are brazed to the core plate 5 under the condition that the tubes are inserted into holes 5c formed in bent portions 5a. Due to the above structure, even when a pitch between the tubes is reduced, it is possible to ensure a sufficiently high mechanical strength of the core plate 5. Accordingly, the occurrence of a big difference in the mechanical strength between the core plate 5 and the tubes can be suppressed. Therefore, stress concentration at a joint portion of the core plate 5 and the tubes can be prevented. As a result, the mechanical strength of a radiator and the reliability (durability) of the joint portion of the core plate 5 and the tubes can be enhanced.

Abstract: The object of the present invention is to provide a heat exchanger which can prevent the tubes from being damaged by the heat stress caused by the temperature difference between the reinforcement members and the tubes of the core portion. A heat exchanger comprises a core portion having a plurality of tubes 12a and fins 12b which are arrange so as to be alternately laid in layers. In the core portion 12, the tubes 12a are arranged at the outermost ends in the piling direction V of the tubes 12a and the fins 12b and the inserts (14) which reinforce the core portion 12 are fixed to the tubes (12a) and tanks (11, 13).

Abstract: In the fin 112 on the front grille side which is an upstream side of the air current, there is provided a reinforcing portion 112c formed when the fin 112 is made into a wave-shape. By this reinforcing portion 112c, it is possible to prevent the core portion 110 (fin 112) from being deformed by water at high pressure. Therefore, it is possible to reduce the thickness of the fin 112 while the deformation of the fin 112 is prevented even if washing is conducted with water at high pressure.

Abstract: A tapered section and a flange section which constitute reinforcements are provided on mounting members to which a blower (fan shroud) is to be attached. The reinforcements are provided on the sides of the reinforcements which are in contact with a longer side wall surface of a rectangular tank. According to this structure, it is possible to prevent the longer side wall surface from deforming, while mitigating the concentration of stress to the joint portions between the mounting members and the longer side wall surface. Therefore, the mechanical strength, reliability and durability of the header tank can be improved without increasing the mass (weight) and production cost of the radiator.

Abstract: Separators are prevented from being moved from a correct position before completion of soldering. After calking portions 31a, 32a, 43 are plastically deformed and the separator 31, 32 are mechanically fixed on a header tank 40 by calking, the separators 31, 32 are coupled to the header tank 40 by soldering. Thereby, as the separators 31, 32 are prevented from being moved from the correct position with respect to the header tank 40 before completion of soldering, it is possible to prevent defects in soldering where gaps are created in coupled portions.

Abstract: A heat exchanger module includes a first heat exchanger disposed at a downstream air side of second and third heat exchangers. In the heat exchanger module, walls are formed in reinforcement plates of the second and third heat exchangers, to be approximately perpendicular to a cooling air flow direction. Further, communication holes through which air passes are provided in the walls of the reinforcement plates. Accordingly, a sufficient amount of air for heat exchange can be supplied to the first heat exchanger, while the second and third heat exchangers can be reinforced enough by the reinforcement plates.

Abstract: A wave-shaped portion 5b, the profile of which is formed into a wave-shape, is provided on the core plate 5, and tubes are brazed to the core plate 5 under the condition that the tubes are inserted into holes 5c formed in bent portions 5a. Due to the above structure, even when a pitch between the tubes is reduced, it is possible to ensure a sufficiently high mechanical strength of the core plate 5. Accordingly, the occurrence of a big difference in the mechanical strength between the core plate 5 and the tubes can be suppressed. Therefore, stress concentration at a joint portion of the core plate 5 and the tubes can be prevented. As a result, the mechanical strength of a radiator and the reliability (durability) of the joint portion of the core plate 5 and the tubes can be enhanced.

Abstract: A plurality of angle portions 2c of the fins on an upstream side and those on a downstream side of an air flow are provided so as to be substantially symmetrical with each other. Due to this, bending forces are continuously exerted on a thin plate-like fin material in a direction where the bending deformation of the fin material is cancelled, during the fin forming process. Accordingly, when the angle portions 2c are formed it can be prevented in advance that the fin material 11 is deformed in a state where the repeated deformations of the fin material 11 are accumulated in the same direction.

Abstract: A double heat exchanger for a vehicle air conditioner has a first radiator for cooling engine coolant, a second radiator for cooling electronic-parts coolant for cooling electronic parts of the vehicle and a condenser disposed at an upstream air side of the first and second radiators. The condenser has a condenser core and a cooler through which refrigerant discharged from the condenser core flows. The second radiator is disposed opposite the cooler so that air having passed through the cooler passes through the second radiator. Therefore, a difference between a temperature of air passing through the second radiator and a temperature of electronic-parts coolant flowing through the second radiator is increased, and electronic-parts coolant is sufficiently cooled. As a result, the electronic parts are sufficiently cooled without increasing a size of the second radiator.