Abstract: In a core structure of a heat exchanger, tubes and corrugated fins are alternately arranged between sheet plates arranged opposite to each other with a predetermined space interposed therebetween. End portions of the tubes are inserted into tube holes formed respectively in each of the top and bottom sheet plates to be fixed. On the sheet plates, there are provided connection portions having wall portions slanting from main body portions thereof toward the tube holes. When a thickness of the tubes is 0.13 mm to 0.

Abstract: A corrugated fin for a composite heat exchanger for motor vehicles include a condenser portion and a radiator portion. The radiator portion is larger in fin width than the condenser portion. The condenser portion and the radiator portion have respectively first and second louvers formed corresponding to the fin widths. The first and second louvers respectively have first and second louver slats inclined in a direction which is different for each of the condenser portion and the radiator portion to oppose each other, and an inclination angle of the second louver slats is smaller than an inclination angle of the first louver slats.

Abstract: In a cooling system for a water-cooled internal combustion engine and a control method applicable to the control system, a pump to circulate a coolant to the water-cooled engine and a heat exchanger is drivingly controlled in such a manner that, when a temperature of the coolant detected by a temperature detector indicates a value higher than a predetermined target temperature, a flow state of the coolant circulated within a plurality of tubes arranged within the heat exchanger falls within a predetermined range including at least one of a transition range between a laminar flow range and a turbulence flow range and a part of the turbulence flow range which is placed in vicinity to the transition range (corresponding to 1800 through 6000 in Reynolds number) and the coolant is circulated through the pump into the water-cooled engine and the heat exchanger by a predetermined flow quantity.

Abstract: In a fin forming step, fins of heat exchangers are formed into a connected state where the fins are connected to each other via a parting portion. In a fin attaching step, the fins in the connected state are temporarily attached to the respective heat exchangers. In a fin fixing step, an integrated heat exchanger in which the fins are temporarily attached is passed through a heating oven to braze the fins to the respective heat exchangers. In a fin separating step W4, the fins in the connected state of the respective heat exchangers are separated from each other in the parting portion. Therefore, each of the heat exchangers can independently perform a heat exchanging operation without being affected by heat conduction from the other heat exchanger via the fins.

Abstract: A water-cooled type engine cooling apparatus includes: an oil cooler that circulates cooling water flowing out of a water-cooled type engine; a water temperature detection unit that detects temperature of the cooling water; a switching unit that switches the oil cooler from an operating state to a halt state, and vice versa; and a switching control unit that controls switching of the switching unit. The switching control unit controls the switching unit to switch the oil cooler into the halt state when the temperature detected by the water temperature detection unit is lower than a preset temperature, and controls the switching unit to switch the oil cooler into the operating state when the temperature detected by the water temperature detection unit is not lower than the preset temperature.

Abstract: In a cooling system for a water-cooled internal combustion engine and a control method applicable to the control system, a pump to circulate a coolant to the water-cooled engine and a heat exchanger is drivingly controlled in such a manner that, when a temperature of the coolant detected by a temperature detector indicates a value higher than a predetermined target temperature, a flow state of the coolant circulated within a plurality of tubes arranged within the heat exchanger falls within a predetermined range including at least one of a transition range between a laminar flow range and a turbulence flow range and a part of the turbulence flow range which is placed in vicinity to the transition range (corresponding to 1800 through 6000 in Reynolds number) and the coolant is circulated through the pump into the water-cooled engine and the heat exchanger by a predetermined flow quantity.

Abstract: A corrugated fin comprises a first part which is interposed between paired first tubes, a second part which is interposed between paired second tubes and a third part through which the first and second parts are integrally connected. The third part of the corrugated fin is formed with louvers which extend in a direction perpendicular to upper and lower folded edge portions of the first and second parts. Each of the louvers is of a half-louver type including an elongate flat portion which is bent up or down along a lower edge thereof from a major portion of the third part and two generally triangular supporting portions which support longitudinal ends of the elongate flat portion from the major portion.

Abstract: A core structure of an integral heat-exchanger comprises at least two first heat exchanger tubes which extend in parallel with each other; at least two second heat exchanger tubes which extend in parallel with each other, the second heat exchanger tubes juxtaposed with the first heat exchanger tubes; and a corrugated fin including a corrugated first part interposed between the first heat exchanger tubes, a corrugated second part interposed between the second heat exchanger tubes and a flat connection part arranged between the corrugated first and second parts. The corrugated first part of the fin is formed with a plurality of first louvers each extending substantially between the two first heat exchanger tubes. The corrugated second part of the fin is formed with a plurality of second louvers each extending substantially between the two second heat exchanger tubes. The innermost one of the second louvers is positioned away from the innermost end of the corrugated second part of the fin by a given length.

Abstract: A warning device for a distance between cars, for measuring a distance between a car and an object in front of the car, judging the possibility of danger on the basis of distance data thus obtained, and generating an alarm in the case where it is judged to be dangerous. The warning device provides a first alarm (a rear-end collision alarm) generated in a condition of alert which necessitates deceleration or braking, and a second alarm (an alarm for a distance between cars) generated in a condition of alert which does not necessitate deceleration nor braking, the first and second alarms, respectively, being judged by separate formulae for determining. Accordingly, it is possible to positively generate an alarm when deceleration or braking is necessitated. Further, the warning device discriminates a kind of an object being measured (a moving body, obstruction, guardrail or the like) to judge danger according to the kind of the discriminated object.