Abstract: An aluminum alloy heat exchanger having a tube composed of a thin aluminum alloy clad material, wherein, in the clad material, one face of an aluminum alloy core material containing Si 0.05–1.0 mass % is clad with an Al—Si-series filler material containing Si 5–20 mass %, and the other face is clad with a sacrificial material containing Zn 2–10 mass % and/or Mg 1–5 mass %, and wherein an element diffusion profile of the clad material by EPMA satisfies (1) and/or (2): L-LSi-LZn?40(?m) ??(1) L-LSi-LMg?5(?m) ??(2) wherein L is a tube wall thickness (?m); LSi is a position (?m) indicating an amount of Si diffused from the filler material; and LZn and LMg each represent a region (?m) indicating an amount of Zn or Mg diffused from the sacrificial material, respectively; and a method of producing the heat exchanger.

Abstract: An aluminum alloy heat exchanger having a tube composed of a thin aluminum alloy clad material, wherein, in the clad material, one face of an aluminum alloy core material containing Si 0.05-1.0 mass % is clad with an Al—Si-series filler material containing Si 5-20 mass %, and the other face is clad with a sacrificial material containing Zn 2-10 mass % and/or Mg 1-5 mass %, and wherein an element diffusion profile of the clad material by EPMA satisfies (1) and/or (2): L-LSi-LZn?40 (?m)??(1) L-LSi-LMg?5 (?m)??(2) wherein L is a tube wall thickness (?m); LSi is a position (?m) indicating an amount of Si diffused from the filler material; and LZn and LMg each represent a region (?m) indicating an amount of Zn or Mg diffused from the sacrificial material, respectively; and a method of producing the heat exchanger.

Abstract: An aluminum alloy heat exchanger having a tube composed of a thin aluminum alloy clad material, wherein, in the clad material, one face of an aluminum alloy core material containing Si 0.05-0.

Abstract: A partly damaged aluminum heat exchanger such as an aluminum radiator is repaired by closing a hole in the damaged portion with an acrylic resin adhesive material. A certain area around the damaged portion is pressed down to form a cup-shaped depressed portion. The adhesive material is supplied to the depressed portion so that it is retained therein. Then, the adhesive material is hardened by curing it under the room temperature. The hardened adhesive material completely closes the hole with a sufficient thickness and strength because it is retained in the depressed portion. The adhesive material is cured in a relatively short time because the acrylic resin is used as the adhesive material.

Abstract: An aluminum alloy fin material for brazing which is composed of an aluminum alloy comprising above 0.1 wt % to 3 wt % of Ni, above 1.5 wt % to 2.2 wt % of Fe, and 1.2 wt % or less of Si, and at least one selected from the group consisting of 4 wt % or less of Zn, 0.3 wt % or less of In, and 0.3 wt % or less of Sn, and further comprising, optionally, at least one selected from the group consisting of co, Cr, Zr, Ti, Cu, Mn, and Mg in given amounts, the balance being unavoidable impurities and aluminum, wherein a ratio of the grain length in the right angle direction/the grain length in the parallel direction is 1/30 or less, an electric conductivity is 50 to 55 %IACS, and a tensile strength is 170 to 280 MPa.

Abstract: An aluminum alloy brazing sheet having a four-layered structure, of sheet thickness 0.2 mm or less, and having a core alloy, a filler alloy of an Al—Si alloy on one surface of the core alloy, a sacrificial anode material of an Al—Zn alloy on the other surface of the core alloy, and an intermediate layer between the core alloy and sacrificial anode material, wherein the core alloy is composed of an Al alloy containing given amounts of Si, Fe, Mn, and Cu, with the balance being made of Al and unavoidable impurities, and wherein the intermediate layer is composed of an Al alloy containing given amounts of Si, Fe, Mn, and Cu, with the balance being made of Al and unavoidable impurities.

Abstract: A core material of an aluminum brazing sheet restricts Mg to less than 0.3 wt % and Fe to not more than 0.2 wt %, and contains more than 0.2 wt % and not more than 1.0 wt % of Cu, 0.3 to 1.3 wt % of Si, 0.3 to 1.5 wt % of Mn and the balance of Al and inevitable impurities. A brazing filler material is formed on one surface of the core material by Al—Si based aluminum alloy. Also, a cladding material is formed on the other surface of the core material, and contains less than 0.2 wt % of Si, 2.0 to 3.5 wt % of Mg, not less than 0.5 wt % and less than 2.0 wt % of Zn and the balance of Al and inevitable impurities. Further, the value (cladding material hardness)/(the core material hardness) that is a ratio of the hardness of the cladding material to the hardness of the core material is not more than 1.5.

Abstract: An aluminum alloy brazing sheet having a four-layered structure, of sheet thickness 0.2 mm or less, and having a core alloy, a filler alloy of an Al—Si alloy on one surface of the core alloy, a sacrificial anode material of an Al—Zn alloy on the other surface of the core alloy, and an intermediate layer between the core alloy and sacrificial anode material, wherein the core alloy is composed of an Al alloy containing given amounts of Si, Fe, Mn, and Cu, with the balance being made of Al and unavoidable impurities, and wherein the intermediate layer is composed of an Al alloy containing given amounts of Si, Fe, Mn, and Cu, with the balance being made of Al and unavoidable impurities.

Abstract: A core material of an aluminum brazing sheet restricts Mg to less than 0.3 wt. % and Fe to not more than 0.2 wt. %, and contains more than 0.2 wt. % and not more than 1.0 wt. % of Cu, 0.3 to 1.3 wt. % of Si, 0.3 to 1.5 wt. % of Mn and the balance of Al and inevitable impurities. A brazing filler material is formed on one surface of the core material by Al-Si based aluminum alloy. Also, a cladding material is formed on the other surface of the core material, and contains less than 0.2 wt. % of Si, 2.0 to 3.5 wt. % of Mg, not less than 0.5 wt. % and less than 2.0 wt. % of Zn and the balance of Al and inevitable impurities. Further, the value (cladding material hardness)/(the core material hardness) that is a ratio of the hardness of the cladding material to the hardness of the core material is not more than 1.5.

Abstract: An aluminum alloy fin material for brazing which is composed of an aluminum alloy comprising above 0.1 wt % to 3 wt % of Ni, above 1.5 wt % to 2.2 wt % of Fe, and 1.2 wt % or less of Si, and at least one selected from the group consisting of 4 wt % or less of Zn, 0.3 wt % or less of In, and 0.3 wt % or less of Sn, and further comprising, optionally, at least one selected from the group consisting of Co, Cr, Zr, Ti, Cu, Mn, and Mg in given amounts, the balance being unavoidable impurities and aluminum, wherein a ratio of the grain length in the right angle direction/the grain length in the parallel direction is 1/30 or less, an electric conductivity is 50 to 55% IACS, and a tensile strength is 170 to 280 MPa.

Abstract: An aluminum alloy clad material for heat exchangers exhibiting superior strength after brazing and excellent corrosion resistance is provided. The aluminum alloy clad material comprises a sacrificial anode material which is clad on one side of a core material, wherein the core material comprises an aluminum alloy comprising 0.3-2.0% of Mn, 0.25-1.0% of Cu, 0.3-1.1% of Si, and 0.05-0.35% of Ti with the remaining portion consisting of aluminum and impurities, the sacrificial anode material comprises an aluminum alloy comprising 1.5-8% of Zn, 0.01-0.8% of Si, and 0.01-0.3% of Fe with the remaining portion consisting of aluminum and impurities, and the total number of particles of Si compounds and Fe compounds with a particle diameter (circle equivalent diameter) of 1 &mgr;m or more present in the sacrificial anode material matrix is 2×104 or less per 1 mm2. The clad material is suitably used as a tube material or header plate material for automotive heat exchangers such as a radiator or heater core.

Abstract: A pair of header plates securely brazed with a pair of side plates without causing any buckling to tubes and any deformation to the header plates. First, each tube is press-fitted into a corresponding press-fitting hole in the header plates, and at the same time, the end parts of a pair of side plates make contact with the pair of header plates. Second, flaring pins are press fitted into the end parts of the tubes in such a way that the end parts of the tubes disposed near either side of a core assembly are flared to an angle of approximately 180.degree. and the end parts of the tubes disposed in the central part of the core assembly are flared to an angle within a range from approximately 60.degree. to approximately 80.degree.. Third, cores, etc. are hung from either of the upper header plates, whichever is disposed at the upper side, and then this assembly is brazed. At this time, large widening parts with an angle of approximately 180.degree. can prevent the upper header plate from sliding downwards.

Abstract: An aluminum alloy composite material for brazing has a core member, an Al--Si filler member clad on one surface of the core member and an aluminum alloy cladding member clad on the other side of the core member. The core member is made of an aluminum alloy containing 0.3 to 1.3 wt. % of Si, 0.3 to 1.5 wt. % of Mn, 0.02 to 0.3 wt. % of Ti, and, as required, 0.3 wt. % or less of Cr and 0.2 wt. % or less of Zr, the content of Mg being restricted to 0.2 wt. % or less and the content of the Cu being restricted to 0.2 wt. % or less as an impurity. The cladding member is made of an aluminum alloy containing 0.3 to 3 wt. % of Mg, 5 wt. % or less of Zn, 0.1 to 1.0 wt. % of Si. The thickness of the core member is preferably, 2.5 times or more greater than that of the filler member, falling within a range of 0.1 to 1 mm.

Abstract: A clad aluminum alloy material having high strength and high corrosion resistance for a heat exchanger, which is composed of a core material made of an aluminum alloy consisting of 0.3 to 2.0% of Mn, 0.25 to 0.8% of Cu, 0.05 to 1.0% of Si and 0.5% or less of Mg with the balance consisting of Al and unavoidable impurities; a sacrificial anode material bonded to one surface of the core material, the sacrificial anode material being made of an aluminum alloy consisting of 1.0 to 2.5% of Mg and 0.05 to less than 0.20% of Si with the balance consisting of Al and unavoidable impurities; and a cladding bonded to the other surface of the core material, the cladding being made of a brazing filler metal consisting of an Al-Si-base aluminum alloy. In the clad aluminum alloy materials, the core material may further include 0.35% or less of Ti and the sacrificial anode material may further include 3.0% or less of Zn or at least one member selected from the group consisting of 0.2% or less of In, 0.2% or less of Sn and 0.

Abstract: In order to cool an engine effectively, an engine oil temperature is detected by an oil temperature sensor. When the engine oil temperature is above a predetermined valve, the cooling fluid being introduced into the engine is divided into two streams. One stream is introduced into a cylinder head and the other stream is introduced into a cylinder block. The amount of cooling fluid being introduced into the cylinder block is controlled according to the engine oil temperature.

Abstract: A cooling device for an internal combustion engine has an additonal water pump and a bypass conduit which bypasses the additional water pump. When the amount of heat radiation of the radiator is insufficient, the additional water pump is driven by an electric motor. When the additional water pump is not necessary, the bypass conduit is opened, so that the cooling fluid bypasses the additional pump.

Abstract: A radiator cap sets on a filler neck of an automotive radiator tank. The radiator cap has an inner cap rotatably connected with an outer cap, a pressure valve operatively connected with the inner cap in such a manner that the pressure valve can move vertically so that the pressure valve opens the filler neck when the pressure within the radiator tank increases up to a predetermined pressure. The radiator cap further includes a coil spring provided between the inner cap and the pressure valve for biasing the pressure valve toward the filler neck. Since the connecting point between the coil spring and the pressure valve is lower than the connecting point between a sealing portion of the pressure valve and the filler neck, a rotating moment which returns the pressure valve horizontally is generated when the pressure valve is inclined, preventing the pressure valve from inclining.

Abstract: A radiator for an automotive engine has a filler neck having a coolant pass therein. The filler neck has both an inner tubular member and an outer tubular member so that the coolant pass is formed between the inner surface of the outer tubular member and the outer surface of the inner tubular member. The coolant pass is connected with a connecting pipe in order to introduce the coolant within the coolant pass toward the connecting pipe. The coolant introduced into the connecting pipe is, then, flows toward a reserve tank.Since all coolant flowing toward the connecting pipe is orientated its vector while passing through the coolant pass, the coolant can be introduced into the connecting pipe smoothly.