Abstract: In a corrugated fin type heat exchanger a flat tube can be replaced, to improve heat exchange performance thereof. A characteristic part of the heat exchanger lies in a projection having been formed on the ascending surface and the descending surface of the corrugated fin of respective tube elements.

Abstract: To mitigate thermal stress concentration in the vicinity of a flow-volume limiting portion in a stacked plate heat exchanger to thereby prevent fatigue breaking due to the same. The flow-volume limiting portion is also provided with opening portions that are similar to those in flow paths to reduce rigidity difference from flow path portions.

Abstract: In a header plateless type heat exchanger, to suppress temperature rise at an apical portion of a tube into which exhaust gas at high temperatures or the like flows, to thereby improve durability. A recessed groove portion 4c recessed inward with narrow width is formed on outer face side of each of a pair of plates, in parallel to a swelling portion 4 and in the approximately same length.

Abstract: An axial-flow fan includes a fan motor provided with a projecting rotary shaft, and a fan having a bowl-like shaped boss part to be fitted over an end part on a rotary shaft side of the fan motor via a space and having many fan blades projected in a radial pattern on an outer periphery of the boss part, in which a plurality of air holes are formed in a shaft line direction of the rotary shaft, adjacently to the rotary shaft and intensively in a central portion of the boss part; a blade air current is generated in one direction of the shaft line by the many fan blades; and a central portion air current is formed by discharging air passing through an inside of the space in the other direction of the shaft line through the air hole. Then, the rotary shaft is cooled with the central portion air current.

Abstract: Respective gaps between a pair of vertical outer surfaces parallel to a pressing direction of a punch and inner surfaces of a cavity portion of a die facing the same, at positions at both ends in a longitudinal direction of the cross-section of the punch, are set smaller than respective gaps between outer surfaces parallel to the pressing direction of the punch and inner surfaces of the cavity portion of the die facing the same, at positions at both ends in a width direction of the cross-section. Burring height formed by pressing a punch for burring toward the cavity portion to insert the punch into the same is generally proportional to these gap values, and therefore the burring height at ends in the major axis direction becomes lower than that in the minor axis direction.

Abstract: A structure of a drawn cup-type heat exchanger of improved pressure tightness is provided. A drawn cup-type heat exchanger is configured by stacking in plural number a long and thin tube element containing an inner fin inside a pair of cup plates. The cup plates have a flat containing portion containing the inner fin and a pair of cup portions communicating with both end portions of the containing portion; a circulation hole for communicating fluid into each of tube elements to be stacked is formed in the cup portions; and, to position both end portions in a longitudinal direction of the inner fin to be contained in front of the circulation hole of the cup portions, a corner portion is formed at at least one end portion in a width direction at both extremities in a longitudinal direction of the containing portion.

Abstract: To provide a plate laminate type heat exchanger that is capable to be temporarily fixed easily and surely before brazing assembly and can be fabricated with good accuracy. In a plate laminate type heat exchanger using a cladding material cladded with a brazing material, in each of laminated plates, a round hole penetrating in a laminate direction is formed; a thin and long fixing pin is inserted into the round hole so as to communicate each of plates; the fixing pin is fixed to the round hole by expansion of the outer diameter only at one end part in the longitudinal direction of the fixing pin; and each of plates is temporarily fixed integrally.

Abstract: A multi-plate oil cooler with high joining strength with an inner fin while suppressing a usage amount of a nickel brazing filler, even when ferrite-based stainless steel with low wettability for a nickel brazing filler is used for a plate is provided. A plate made from a ferrite-based stainless steel plate and an inner fin made from a pure iron plate or a carbon steel plate are joined with a nickel brazing filler to form a multi-plate oil cooler. In general, a structure body is provided wherein a ferrite-based stainless steel and pure iron or a carbon steel are joined with a nickel brazing filler.

Abstract: A machining method for a burred flat hole includes first an overhang portion is formed in a flat hole-forming region in a metal plate in a first step, subsequently a flat hole portion is formed in the overhang portion in a second step, and finally burring is formed on the peripheral edge portion of the hole portion in a third step. Accordingly, when burring is to be formed, overhanging machining and perforating machining have been substantially completed, and therefore pressing force of a punch for burring machining can be set to the minimum value necessary for burring formation.

Abstract: In a laminated core type heat sink in which a plate is formed by arranging a plurality of slits in parallel to a metal flat plate and by laminating the plate in large numbers, the thickness of a second plate positioned second in the lamination direction from an end lid to which a semiconductor is attached is made greater than thickness of a first plate other than the second plate.

Abstract: Conditions are found for a heat sink having the highest heat exchange performance on the basis of mutual relationship among thickness of each plate, slit pitch, and horizontal rib, in a laminated heat sink core in which numerous parallel slits are punched in a plate, slender vertical ribs are disposed therebetween and the plate is laminated.

Abstract: A packing is held between a tank body and a header plate to secure sealing. Therewith, the width in a longer axis direction of an opening of a flat tube is wider and the width of the tank body is relatively narrow, resulting in a compact tank structure. A number of tooth parts protrude from the tank body at regular intervals, a tube end release part is formed between the tooth parts, and a side edge in a longitudinal axis direction of an opening of the flat tube is positioned therein. The tooth part, a flange part, a seal face of the header plate and a peripheral wall form a packing accommodation part, and a tip edge of the tooth part is seated on an edge of a convex part. The packing is arranged between the packing accommodation part and the seal face.

Abstract: A heat sink made from laminated plates and formed with spaced apart ribs and slits positioned so as to control circulation of refrigerant over the heat sink during cooling of an object by the heat sink.

Abstract: To provide a structure of a heat exchanger core that enables the outer periphery of an stacked body 8 including an assembly of flat tubes to be held in a previously fastened state and is excellent in mass-productivity, external frame portions of a pair of frame bodies are fitted onto both ends of a bulging portion of the stacked body of the flat tubes, and, in the state where the stacked body is restrained, a casing is additionally fitted onto the outer periphery of the stacked body.

Abstract: An exhaust gas heat exchanger having stacked flat tubes includes a stacked tube body configured by stacking a plurality of flat tubes in multiple tiers with spaces therebetween and arranged inside a case; exhaust gas flows in from a first end part of the stacked tube body in a tube axis direction, circulates through each flat tube, and flows out from the a second end part; and cooling water from the case is supplied to the first end part to circulate along an exterior surface side of each flat tube. The cooling water is introduced into the tubes from two locations of the case and in mutually opposite directions which are parallel to flat surfaces of the tubes and vertical in the axis direction of the flat tubes.

Abstract: A corrugated fin heat exchanger is provided in which the direction in which louvers are cut and raised is inclined in one direction only, and in which heat transfer performance is improved above that of conventional fins. To accomplish this, the relationship H>Qup/(Qup?1)×?H is satisfied. H represents the core height of the heat exchanger, Qup represents the ratio of the amount of heat exchanged per corrugation between one-directional louver fins and multi-directional louver fins in an airflow part, and ?H represents the amount of increase in a heat transfer reduction region of a heat exchanger core as a result of changing from multi-directional louver fins to one-directional louver fins.

Abstract: In order to prevent deformation of a side member due to thermal stress in a heat exchanger in which water for cooling a high-temperature body circulates, a side member is formed in the shape of a groove, the cross section of which has side wall parts and a base part along the entire length in the lengthwise direction of a main body part, and both ends of the side member in the lengthwise direction are provided with a stepped part, which is formed as a step toward the outside of a core, and one or more brace-like ribs, which integrally connect the tip end and the base part of the stepped part in a slanting manner.

Abstract: A flat tube for a header-plateless heat exchanger has an inner plate and an outer plate that are each press-molded from a metal plate and are curved/folded into a groove shape comprising a groove bottom section and two side wall sections. Both plates are such that the outer plate is fitted to the outside of the inner plate in a manner such that the groove bottom sections oppose each other, and an expanded opening in the thickness direction is formed at both ends of the plates.

Abstract: A heat exchanger is formed by a plurality of heat exchanger units each including a respective small tank at each end of a core, the units being stacked in a thickness direction of the cores, and oil is supplied to finned tubes constituting the core of each of the units via a header. Each of the tanks has an opening for communicating with the header which opening is at a position on the length of the tank different from that of each of the adjacent tanks.

Abstract: In order to improve sealing performance when the open end of a tank is swaged and thereby secured inside an annular groove the surface of which is formed in a substantially rectangular shape with a seal material between the groove an the tank, flange parts protrude in a fan shape at the four corners of the seal material, and those flange parts are pressed by the corner sections of the annular groove, thereby preventing the seal material from moving in the corner sections.