Abstract: A circulating path 12 is provided for circulating a heat transfer medium across the cooling section 6A and an exhaust heat exchanger 9. The circulating path 12 is communicated to an output heat exchanger which is mounted on a hot water storage. The heat transfer medium is circulated by a pump 10 from the exhaust heat exchanger 9 to the oil heat exchanger 5 and the cooling section 6A. The heat transfer medium to be introduced into the exhaust heat exchanger 9 is so controlled in the flow rate that a temperature of the water vapor in the exhaust gas is declined to a temperature lower than the dew point. The heat transfer medium when having received heat directly from the exhaust gas and heat generated by condensation of the exhaust heat is conveyed to the cooling section 6A where its temperature soars up further.

Abstract: A compact cooling system includes a mounting panel adapted to receive a plurality of at least three cooling units, a cooling fan, and a fan drive mechanism. The mounting panel supports the fan and drive mechanism in a manner allowing rotation of the fan about the axis of rotation. A front side of the mounting panel is adapted for receiving and supporting the cooling units in a pattern defining a cantilevered, tubular polygonal solid disposed about the fan. The mounting panel includes a convex central region extending into the tubular polygonal solid and receiving the drive mechanism in operative connection to the fan. By virtue of this arrangement, a very compact cooling system is provided. The tubular polygonal shape of the cooling units, when mounted on the mounting panel, forms an air duct for directing a flow of cooling air induced by the fan through the cooling units.

Abstract: A heat exchanger has oil core plates and coolant core plates disposed in alternating, stacked relationship. Flow passages are provided between adjacent plates, so that the oil flow passages alternate with the coolant flow passages, and the oil can flow from an oil inlet opening of each oil plate, and through the oil flow passage to an oil outlet opening, and coolant can flow from a coolant inlet opening of each coolant plate through the coolant flow passage to a coolant outlet opening. The oil inlet openings are adjacent one end of the plates, and the oil outlet openings are spaced from the oil inlet openings, with a passageway for flow of the oil between upstanding bosses of the coolant plates on opposed sides of each oil plate and extending from a gap in an upstanding flange of the oil plate to the oil outlet opening.

Abstract: A stacked plate-type heat exchanger including a plurality of dish-shaped heat exchanger plates arranged one next to the other to form a nested heat exchanger plate stack. A plurality of first and second fluid flow channels are formed between the heat exchanger plates for first and second fluids respectively, and first fluid and second fluid chambers are formed in the stack in communication with the first and second fluid channels respectively. An end plate for the heat exchanger has an end plate central planar portion and a peripheral flange projecting from the end plate central planar portion, the peripheral flange of the end plate projecting in an opposite direction and sealably nested within the peripheral flange of a final heat exchanger plate in the plate stack.

Abstract: Optimization of the efficiency of a compact cooling system for air cooling of at least two different heat exchange fluids is obtained in a construction including three heat exchangers (10), (12), (14) arranged in a housing-like shape with an open center. A radial fan (44) is located within the housing and is rotatable about an axis (42). A front panel (36) having an air inlet (38) on the axis (44) abuts a corresponding one of the opposed sides (26), (62) of each of the heat exchangers while a rear panel abuts the other of the opposed sides (64) of each of the heat exchangers (10), (12), (14) and journals the fan (44) for rotation about the axis (44).

Abstract: An apparatus to regulate and control the temperature of an axle assembly for a vehicle. A heat pipe is inserted though the axle housing cover, the heat pipe travels the length of the cover. Near the lower region of the carrier and beneath the lubricating fluid level, the heat pipe bends to continue in the horizontal direction. Disposed about the terminal end of the heat pipe below the lubricating fluid line are a series of cooling fins. Heat generated within the lubricating fluid that is heated during operation conduit is dissipated via the cooling fins.

Abstract: In a transmission-fluid cooling system of an automatic transmission of an automotive vehicle equipped with a water-cooled oil cooler and an air-cooled oil cooler connected in series to each other, a first bypass valve is provided to permit working fluid to circulate therevia through oil passages in the transmission, bypassing the water-cooled oil cooler and the air-cooled oil cooler, only when a working-fluid temperature is less than or equal to a predetermined temperature and the line pressure is greater than or equal to a predetermined pressure. Also provided is a second bypass valve that opens to permit the working fluid to circulate via the water-cooled oil cooler and the second bypass valve through the oil passages in the transmission, bypassing only the air-cooled oil cooler, only when the working-fluid temperature is less than or equal to a preset temperature value.

Abstract: A heat exchanger for cooling oil with water includes (a) oil and water chambers alternately arranged to form a core portion; (b) a through hole formed in the core portion to allow an oil flow therethrough; (c) first and second oil passages communicating with the oil chambers; (d) a blocking plate for blocking a part of these oil passages; and (e) a cover member covering one side of the core portion. The through hole has one end as one of oil inlet and outlet, and the first oil passage has one end as the other. The cover member has an oil passage extending between the other end of the through hole and at least one of the other end of the first oil passage and an end of the second oil passage.

Abstract: In a transmission-fluid cooling system of an automatic transmission of an automotive vehicle equipped with a water-cooled oil cooler and an air-cooled oil cooler connected in series to each other, a first bypass valve is provided to permit working fluid to circulate therevia through oil passages in the transmission, bypassing the water-cooled oil cooler and the air-cooled oil cooler, only when a working-fluid temperature is less than or equal to a predetermined temperature and the line pressure is greater than or equal to a predetermined pressure. Also provided is a second bypass valve that opens to permit the working fluid to circulate via the water-cooled oil cooler and the second bypass valve through the oil passages in the transmission, bypassing only the air-cooled oil cooler, only when the working-fluid temperature is less than or equal to a preset temperature value.

Abstract: A heat exchanger has a plurality of oil core plates, and a plurality of coolant core plates, with each plate having an oil inlet opening adjacent one end of the plate, an oil outlet opening spaced from the oil inlet opening towards an opposed end of the plate, a coolant inlet opening, and a coolant outlet opening, and with the coolant inlet and outlet openings being adjacent the opposed end of the plate. Each oil core plate has an inwardly inclined, upstanding flange surrounding the oil inlet opening in the plate except for a portion thereof adjacent the one end of the plate at which a gap is provided in the flange. The oil outlet opening in the plate extends to adjacent the opposed end of the plate, and a further inwardly inclined, upstanding flange surrounds the oil outlet opening in the plate except adjacent the opposed end of the plate at which a further gap or gaps are provided in the further flange.

Abstract: The invention relates to a heat exchanger, particularly of cross-current design, through which at least two separate media can flow. It comprises plates which are stacked on one another and which are spaced apart from one another in some areas and are in contact with one another in other areas, so that flow paths are formed between respectively adjacent plates in a heat exchange region. The plates have apertures adjacent to the heat exchange region, and the plates are spaced apart from one another by means of shaped-out portions of the plates. Areas succeeding one another about the circumference of the plates have apertures, and these areas are alternately shaped out in opposite directions from the plane of the plates.

Abstract: A turbulator (60A-60K) is provided for use in the heat exchange units (34) of heat exchangers. The turbulator (60A-60K) includes a sheet (62A, 62C) of material. The sheet (62A, 62C) includes a plurality of strand-like rows (64A, 64C) of alternating crests (66A, 66C) and valleys (68A, 68C). The crests (66A, 66C) and valleys (68A, 68C) in each row (64A, 64C) are offset with respect to the crests (66A, 66C) and valleys (68A, 68C) in any immediately adjacent row (64A, 64C). Each of the rows (64A, 64C) has an interface with any immediately adjacent row (64A, 64C). The interfaces are perforated so that valleys (68A, 68C) in each row (64A, 64C) are in fluid communication with immediately adjacent crests (66A, 66C) in any immediately adjacent row (64A, 64C) and crests (66A, 66C) in each row (64A, 64C) are in fluid communication with any immediately adjacent valleys (68A, 68C) in any immediately adjacent row (64A, 62C).

Abstract: An oil cooler comprises an inner water pipe, an outer oil pipe, a strainer pipe sleeved between oil pipe and water pipe, and a connector mechanism at either end of oil cooler and including a hollow cylindrical connector having a passage coupled to water pipe, a ring groove, a plurality of first O-ring grooves, an abutment groove adjacent ring groove, and an oil channel connected to strainer pipe, a ring fitted in ring groove, and a plurality of first O-rings fitted in O-ring grooves. The invention adopts a snapping mechanism to secure oil pipe to the cylindrical connector, thus eliminating potential crack in welded portion of pipes and end connectors and leakage. Moreover, it is easy to assemble, durable, and high in cooling efficiency.

Abstract: An oil cooler comprises an inner water pipe, an outer oil pipe, a strainer pipe sleeved between oil pipe and water pipe, and a connector mechanism at either end of oil cooler and including a hollow cylindrical connector having a passage coupled to water pipe, a ring groove, a plurality of first O-ring grooves, an abutment groove adjacent ring groove, and an oil channel connected to strainer pipe, a ring fitted in ring groove, and a plurality of first O-rings fitted in O-ring grooves. The invention adopts a snapping mechanism to secure oil pipe to the cylindrical connector, thus eliminating potential crack in welded portion of pipes and end connectors and leakage. Moreover, it is easy to assemble, durable, and high in cooling efficiency.

Abstract: A heat exchanger made of aluminum includes a plurality of first plates and a plurality of second plates stacked alternately in the direction along the thickness thereof. The first plates and the second plates each constitute a three-layer structure. A first sacrificing material layer is clad on the side surface of a first core member making up each of the first plates nearer to a cooling water path and a second sacrificing material layer is clad on the side surface of a second core member making up each of the second plates nearer to the cooling water path. A first brazing material layer is clad on the side surface of the first core member nearer to an oil path, and a second brazing material layer is clad on the side surface of the second core member nearer to the oil path.

Abstract: A system and method for providing a transmission fluid heat exchanger which is external to an engine radiator, an in-line with respect to radiator hose coupled to the engine radiator.

Abstract: A heat exchanger tube for use in a vehicle, including a tube extending in an axial direction and having an end. The end has a first and second appendage attached to it. The first and second appendages are spaced from one another such that the second appendage does not form an enclosed space with the first appendage.

Abstract: A compact cooling system includes a mounting panel adapted to receive a plurality of at least three cooling units, a cooling fan, and a fan drive mechanism. The mounting panel supports the fan and drive mechanism in a manner allowing rotation of the fan about the axis of rotation. A front side of the mounting panel is adapted for receiving and supporting the cooling units in a pattern defining a cantilevered, tubular polygonal solid disposed about the fan. The mounting panel includes a convex central region extending into the tubular polygonal solid and receiving the drive mechanism in operative connection to the fan. By virtue of this arrangement, a very compact cooling system is provided. The tubular polygonal shape of the cooling units, when mounted on the mounting panel, forms an air duct for directing a flow of cooling air induced by the fan through the cooling units.

Abstract: A heat exchanger assembly designed for use as a fluid cooler formed of a first metal that includes a dissimilar metal connection allowing the exchanger to be utilized and reliably secured to another structure formed of a second metal. The assembly provides an easy way to cool engine exhausts, oil or another fluid flowing through the exchanger by transferring its heat to a cooling fluid flowing around the exchanger, or vice versa. The exchanger of the assembly is formed from a number of heat exchanger modules. In an embodiment intended particularly to cool diesel engine exhaust for a turbocharger, a steel or stainless steel exhaust inlet/outlet cap which is exposed to the high temperature exhaust is demountably attached to an all-aluminum heat exchange unit connected to the engine cooling system. The high temperature exhaust and the engine coolant follow generally parallel vertical paths through the heat exchanger in a generally U-shaped path that permits a short compact construction.

Abstract: An oil cooler for an internal combustion engine includes an oil circuit and a cooling circuit arranged in a housing with inlet opening and outlet openings. The housing has a generally annular, C-shaped structure which forms a central, axial cylindrical bore and a radially extending slot. The housing is attached to an annular plate. The bore may receive engine components, such as shafts and the like.

Abstract: A heat exchanger has a core provided with passages for a liquid to keep cool and passages for a cooling medium, a first collection tank for supplying the liquid, a second collection tank for withdrawing the liquid, at least one third collection tank, the core being divided into at least two sections through which the liquid successively flows and which are interconnected by the at least one third collection tank, one of the sections being connected with the first collection tank, while the other of the sections being connected with the second collection tank, a bypass line connected with the third collection tank and in parallel with the other sections, and structure for activating and deactivating the bypass lines.

Abstract: There is disclosed a heat exchanger made of an aluminum alloy having a radiator part (10) and an oil cooler part (11) in combination and manufactured integrally by the brazing method, wherein a refrigerant tank (13) for covering and sealing the oil cooler part is made of an aluminum alloy, an aluminum alloy containing Si in an amount from more than 7.0 wt % to 12.0 wt %, Fe in an amount from more than 0.05 wt % to 0.5 wt %, Cu in an amount from more than 0.4 wt % to 8.0 wt %, Zn in an amount from more than 0.5 wt % to 10.0 wt %, and the balance of aluminum and inevitable impurities is used as a filler material of brazing sheets that are used for the oil cooler part and are brazed in the tank, and the refrigerant tank is assembled integrally with the radiator part and the oil cooler part by brazing with the brazing material.

Abstract: An oil cooler for an internal combustion engine includes an oil circuit and a cooling circuit arranged in a housing with inlet opening and outlet openings. The housing has a generally annular, C-shaped structure which forms a central, axial cylindrical bore and a radially extending slot. The housing is attached to an annular plate. The bore may receive engine components, such as shafts and the like.

Abstract: A convectively-cooled hydraulic fluid tank system comprises a hydraulic fluid tank and a fluid cooler incorporated into the hydraulic fluid tank. The fluid cooler includes a vortex chamber having a wall made of a heat conductive material. An inlet is provided to direct incoming pressurized hydraulic fluid tangentially onto the inner surface of the vortex chamber wall to create a swirled flow of hydraulic fluid against the inner surface of the wall. A cooling structure extends from an exterior surface of the vortex chamber wall to promote heat dissipation.

Abstract: The present invention relates to a plate heat exchanger and its method of construction. A pair of round corrugated heat transfer plates provide a cassette with the corrugations of one heat exchanger plate angled relative to the other so as to form angular channels for fluid flow of a primary fluid and a secondary fluid. A plurality of the corrugated cassettes are contained within a housing and are provided with a pair of port holes. The housing is in the form of a cylindrical shell and includes a bottom cover member and a top cover member. The cylindrical shell has an inlet nozzle and an outlet nozzle on opposed sides of the shell for the secondary fluid while the top cover member is provided with an inlet nozzle and an outlet nozzle for a primary fluid. The nozzles of the top cover member are aligned with port holes formed in each of the cassettes. Depending on the type of use, either the portholes or the cassette outer edge may be welded, with gaskets used alternately on the fouling side(s).

Abstract: A heat exchanger having a plurality of stacked plate pairs consisting of face-to-face mating plates with each plate having a peripheral flange and annular inner and outer primary bosses. Each boss has a portion thereof located in a common first plane with the peripheral flange. An annular secondary boss has a portion thereof located in a second plane spaced from the first plane. Intermediate areas between the inner and outer primary bosses have spaced-apart portions to form inner flow passages. Both the primary and secondary bosses have openings formed therein for the passage of heat exchanging fluids. In back-to-back plate pairs, the secondary bosses are joined and the openings therein communicate to define a manifold for a second of these fluids. The inner and outer primary bosses include radially extending ribs formed about the circumference of each boss and extending substantially across the boss.

Abstract: A turbulator (60A-60K) is provided for use in the heat exchange units (34) of heat exchangers. The turbulator (60A-60K) includes a sheet (62A, 62C) of material. The sheet (62A, 62C) includes a plurality of strand-like rows (64A, 64C) of alternating crests (66A, 66C) and valleys (68A, 68C). The crests (66A, 66C) and valleys (68A, 68C) in each row (64A, 64C) are offset with respect to the crests (66A, 66C) and valleys (68A, 68C) in any immediately adjacent row (64A, 64C). Each of the rows (64A, 64C) has an interface with any immediately adjacent row (64A, 64C). The interfaces are perforated so that valleys (68A, 68C) in each row (64A, 64C) are in fluid communication with immediately adjacent crests (66A, 66C) in any immediately adjacent row (64A, 64C) and crests (66A, 66C) in each row (64A, 64C) are in fluid communication with any immediately adjacent valleys (68A, 68C) in any immediately adjacent row (64A, 64C).

Abstract: A refrigerant fluid is placed within a driveline component, and in particular an axle housing. This refrigerant fluid is received within a sealed reservoir such that it is sealed from the typical lubricant in the driveline component. The lubricant heats the refrigerant through a housing such that the refrigerant vaporizes within the driveline component housing, thus cooling the lubricant. The vaporized refrigerant travels to a cooling chamber mounted remotely from the reservoir. The cooled refrigerant is cooled to a liquid state, and then returned to the reservoir. Preferably the cooling chamber is positioned on the vehicle frame vertically above the driveline component.

Abstract: A circulating path 12 is provided for circulating a heat transfer medium across the cooling section 6A and an exhaust heat exchanger 9. The circulating path 12 is communicated to an output heat exchanger which is mounted on a hot water storage. The heat transfer medium is circulated by a pump 10 from the exhaust heat exchanger 9 to the oil heat exchanger 5 and the cooling section 6A. The heat transfer medium to be introduced into the exhaust heat exchanger 9 is so controlled in the flow rate that a temperature of the water vapor in the exhaust gas is declined to a temperature lower than the dew point. The heat transfer medium when having received heat directly from the exhaust gas and heat generated by condensation of the exhaust heat is conveyed to the cooling section 6A where its temperature soars up further.

Abstract: A heat exchanger for cooling oil with water includes (a) oil and water chambers alternately arranged to form a core portion; (b) a through hole formed in the core portion to allow an oil flow therethrough; (c) first and second oil passages communicating with the oil chambers; (d) a blocking plate for blocking a part of these oil passages; and (e) a cover member covering one side of the core portion. The through hole has one end as one of oil inlet and outlet, and the first oil passage has one end as the other. The cover member has an oil passage extending between the other end of the through hole and at least one of the other end of the first oil passage and an end of the second oil passage.

Abstract: A heat exchanger and method of transferring heat between fluids is disclosed using a plurality of stacked plate pairs consisting of face-to-face, mating, ringlike plates, each plate having an outer peripheral flange, an annular inner boss located in a common plane with the peripheral flange, and an offset intermediate area located between the peripheral flange and the inner boss. The peripheral flanges and inner bosses in the mating plates are joined together. The intermediate areas have outwardly disposed joined intermediate bosses having aligned inlet and outlet openings forming manifolds for the flow of a first heat exchange fluid circumferentially through the plate pairs from the inlet manifold to the outlet manifold. The heat exchanger also has a header enclosing either the inner bosses or the outer peripheral flanges to cause all of a second heat exchange fluid to pass between the plate pairs transversely relative to the flow of the first heat exchange fluid.

Abstract: An assembly (oil cooler unit), under the state where first and second plates (130, 140) prevent a heat exchange core (110) from falling from a casing (120), is provisionally assembled, and this oil cooler unit is dipped in a flux to apply the flux. A seal surface plate (150) is then assembled to the second plate (140) and is brazed by heat-brazing in an inert gas atmosphere. Since a flux residue on the seal surface plate (150) can be drastically reduced in this manner after brazing is complete, the seal surface plate (150) can secure predetermined surface texture even after brazing is complete while the number of process steps necessary for applying the flux is reduced.

Abstract: A liquid cooling system 10 for cooling liquids including a housing 11, a housing cover 12, and a liquid cooler 13. The housing 11 is sealingly fastened to the housing cover 12. The liquid cooler 13 is composed of cooling plates 19 stacked one on another. The cooling plates 19 sealingly separate a liquid space 20 from a coolant space 21. The coolant spaces 21 are connected by openings 26 which are disposed on projections 27 on the plates 19. In the housing 11 there is a liquid inlet 15, a liquid outlet 16, a coolant inlet 17 and a coolant outlet 18. The liquid inlet 15 leads into a housing volume 14 on an uncooled side 31 which is formed by the housing 11 and the liquid cooler 13. The uncooled side 31 lies opposite a cooled side 32 which communicates with a return passage 22 extending through the liquid cooler 13. The liquid inlet 15 is sealingly separated by a seal arrangement 25 from the coolant inlet 17 and coolant outlet 18.

Abstract: A motor vehicle combined heat exchanger has a tube bank linked to two manifolds and divided into an oil cooler having tubes for oil, and a condenser having tubes for a cooling fluid. The two types of tubes are different and possess respective hydraulic diameters related by the following inequality: 0.8 mm2≦DHa×DHb≦3.00 mm2 where the hydraulic diameter (DH) of a tube is defined by the formula DH=4S/P, in which S designates the area of the internal cross-section of the tube (expressed in mm2) and P the internal perimeter, or “wet perimeter”, of the tube (expressed in mm).

Abstract: A beaded plate and method of making same for a heat exchanger includes a plate having a generally planar first surface and opposed second surface. The beaded plate also a plurality of first beads extending generally perpendicular to the first surface of the plate and a plurality of second beads extending generally perpendicular to the second surface of the plate. The first beads have a generally arcuate end surface and the second beads have a generally planar end surface.

Abstract: The aluminum plate oil cooler includes a plurality of pairs of plates that are secured along their perimeter to define an oil flow path. The plates include embossed regions that are formed to provide inlet and outlet ports for the oil. Top and bottom reinforcement plates are positioned at the top and bottom of the plurality of pairs of plates. An internal center is positioned between the plates to increase the heat transfer area and turbulate the oil within the oil cooler. An external center is positioned between each of the plurality of pairs to increase the thermal transfer area on the coolant side of the oil cooler. The external center covers the entire surface of the plates and includes holes formed to correspond with the embossed regions on the plates.

Abstract: A heat exchanger having a plurality of stacked plate pairs consisting of face-to-face mating plates with each plate having a peripheral flange and annular inner and outer primary bosses. Each boss has a portion thereof located in a common first plane with the peripheral flange. An annular secondary boss has a portion thereof located in a second plane spaced from the first plane. Intermediate areas between the inner and outer primary bosses have spaced-apart portions to form inner flow passages. Both the primary and secondary bosses have openings formed therein for the passage of heat exchanging fluids. In back-to-back plate pairs, the secondary bosses are joined and the openings therein communicate to define a manifold for a second of these fluids. The inner and outer primary bosses include radially extending ribs formed about the circumference of each boss and extending substantially across the boss.

Abstract: A liquid cooling system 10 for cooling liquids including a housing 11, a housing cover 12, and a liquid cooler 13. The housing 11 is sealingly fastened to the housing cover 12. The liquid cooler 13 is composed of cooling plates 19 stacked one on another. The cooling plates 19 sealingly separate a liquid space 20 from a coolant space 21. The coolant spaces 21 are connected by openings 26 which are disposed on projections 27 on the plates 19. In the housing 11 there is a liquid inlet 15, a liquid outlet 16, a coolant inlet 17 and a coolant outlet 18. The liquid inlet 15 leads into a housing volume 14 on an uncooled side 31 which is formed by the housing 11 and the liquid cooler 13. The uncooled side 31 lies opposite a cooled side 32 which communicates with a return passage 22 extending through the liquid cooler 13. The liquid inlet 15 is sealingly separated by a seal arrangement 25 from the coolant inlet 17 and coolant outlet 18.

Abstract: There is disclosed a heat exchanger made of an aluminum alloy having a radiator part (10) and an oil cooler part (11) in combination and manufactured integrally by the brazing method, wherein a refrigerant tank (13) for covering and sealing the oil cooler part is made of an aluminum alloy, an aluminum alloy containing Si in an amount from more than 7.0 wt % to 12.0 wt %, Fe in an amount from more than 0.05 wt % to 0.5 wt %, Cu in an amount from more than 0.4 wt % to 8.0 wt %, Zn in an amount from more than 0.5 wt % to 10.0 wt %, and the balance of aluminum and inevitable impurities is used as a filler material of brazing sheets that are used for the oil cooler part and are brazed in the tank, and the refrigerant tank is assembled integrally with the radiator part and the oil cooler part by brazing with the brazing material.

Abstract: Oil passages 113 through which oil passes are formed with plates 111, 112 composed of aluminum or an aluminum alloy in an oil cooler, according to the present invention, that is a heat exchanger with an extended life. Moreover, fins 123a composed of a material having a corrosion potential more negative than those of the plates 111, 112 are arranged in cooling water passages 123 through which cooling water, for exchanging heat with oil, passes. A sacrificial corrosive layer 301 having a corrosion potential more negative those of the plates 111, 112 and the fins 123a is formed on each of the surfaces on the sides of the cooling water passages 123 of the plates 111, 112. As a result, the sacrificial corrosive layer 301 is preferentially corroded, and not only the plates 111, 112 but also the fins 123a can be protected. Consequently, the pressure-proof strength of the oil cooler can be maintained, and the product life can be improved.

Abstract: An oil cooler is fixed to an engine via an installation stay provided around an outer periphery of the oil cooler. Thus, the load applied to a core portion is reduced, and the load is dispersed on entire portion of the oil cooler. Thus, the respective stresses applied to respective portions of the oil cooler are very small, and a deformation of the core portion is prevented. Furthermore, since the respective stresses on any portion of the oil cooler is reduced, it is possible to make the oil cooler with aluminum whose strength is lower than that of iron. Furthermore, since the thickness of the installation stay can be reduced, difference in the thermal expansion quantity caused by difference in coefficients of linear expansion of the bolt and the installation stay is significantly reduced, and the loose bolt of the bolt caused by difference in coefficients of linear expansion is prevented.

Abstract: An oil cooler has a tube disposed in a cooling water passage and defining an oil passage therein, an oil side inner fin brazed to an inside wall of the tube in the oil passage, and a water side inner fin brazed to an outside wall of the tube in the cooling water passage. The thickness Tw of the water side inner fin is thicker than the thickness To of the oil side inner fin. The water side and oil side inner fins are corrugated fins.

Abstract: Described is an oil filtration apparatus that includes external vanes 120 and associated outer flow passages 140 for allowing a heat exchange to occur between oil passing therein and cool air that passes by the vanes. A manually rotatable valve 154 is provided at one end of the filtration apparatus for controlling the flow of oil through the manifold. In a first position, the valve allows oil to flow through the outer flow passages through the end cap 152 and into an inner flow passage 142 where it is filtered before flowing through a central passage 134 and out the flow manifold. In a second position, the outer flow passages are blocked so that oil flows directly into the inner flow passage. A pressure sensitive valve 164 is provided in the end cap so that when the filter becomes clogged, oil is diverted directly to the central flow passage bypassing the filter.

Abstract: An assembly (oil cooler unit), under the state where first and second plates (130, 140) prevent a heat exchange core (110) from falling from a casing (120), is provisionally assembled, and this oil cooler unit is dipped in a flux to apply the flux. A seal surface plate (150) is then assembled to the second plate (140) and is brazed by heat-brazing in an inert gas atmosphere. Since a flux residue on the seal surface plate (150) can be drastically reduced in this manner after brazing is complete, the seal surface plate (150) can secure predetermined surface texture even after brazing is complete while the number of process steps necessary for applying the flux is reduced.

Abstract: A transmission fluid cooling system includes a cooler-bypass unit having a banjo bolt relief valve. The banjo bolt relief valve includes a head portion and a body portion. A relief valve is incorporated into the body portion. A valve seat is formed between the head portion and body portion. A ball is biased against the valve seat toward the head portion by a spring within the body portion. When the transmission fluid is cool and viscous, pressure buildup in the head portion overcomes the spring bias of the ball against the valve seat, permitting the flow of transmission fluid through the cooler-bypass unit, bypassing the transmission fluid cooling unit.

Abstract: A heat exchanger is disclosed having a plurality of stacked plate pairs or tubes, each having a predetermined internal cold flow resistance. A bypass conduit is included in the stack of plate pairs or tubes. The bypass conduit includes a central row of spaced-apart, mating dimples defining longitudinal flow channels on either side of the dimples for bypass flow through the bypass conduit under cold flow conditions. The longitudinal flow channels have a height and width such that the cold flow resistance therethrough is less than the cold flow resistance through the stacked plate pairs or tubes. In normal or hot flow conditions, the dimples create flow resistance by forcing the fluid flowing through the bypass conduit to change velocity and direction. This forces more oil to flow through the stacked plate pairs or tubes increasing heat transfer performance.

Abstract: Arrangement in a heat exchanger, for example a retarder oil cooler, constructed from plates with alternating cooling water and oil ducts between them. The plates surrounding the cooling water ducts are provided with converging inward bends in the form of nipples, which are intended to keep the said plates at a distance from one another. Between the plates surrounding the oil ducts there is a so-called turbulator, which on the one hand serves to increase the surface and on the other is designed to make the flow turbulent. The arrangement is characterized in that the oil ducts situated outermost in the cooler each comprise elements designed to reduce the flow through these compared to the flow in other oil ducts. An improved thermal equilibrium is thereby achieved in the outermost ducts, which gives a reduced risk of thermal fatigue, especially in the inward bends converging in the cooling water ducts in the form of nipples. The service life of the heat exchanger is thereby prolonged.

Abstract: A cooling system for an off-highway vehicle includes a heat exchanger (e.g., an engine coolant or hydraulic oil heat exchanger) and a fan mechanism for flowing air along a flow path through the heat exchanger. In the improvement, the fan mechanism is a centrifugal fan mechanism and is substantially the sole means for flowing air along the flow path. That is, there is substantially no ram-urged air. The mechanism includes a housing and a fan in the housing. The fan has forward curved blades, thereby to reduce system noise. A preferred fan has a depth-to-diameter ratio not in excess of about 0.4 and, most preferably, not in excess of about 0.25. An alternate embodiment includes what might be termed a split-discharge arrangement wherein air blown by the fan is discharged along two paths.

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 tube-block-type heat transfer device has a tube block consisting of several tubes arranged side-by-side, having spacing elements which are inserted between two adjacent flat tube end areas respectively, and have in each case at least one connection duct along each transverse side of the tube block. The tubes are sealed off on the end side and are provided with transverse openings in their two end areas, which transverse openings are in a connection-duct-forming connection with spacing element transverse openings. At least one pair of separation spacing elements 5a, 5b situated opposite one another in the same space between two tubes have a closed construction so that, on each transverse side of the tube block, at least two mutually separated connection ducts is are formed so that several fluids can flow separately through pertaining tube block sections. The heat transfer device is especially useable as an oil/air cooler for motor vehicles for cooling engine and transmission oil.