JP6126358B2 - Multi-plate oil cooler - Google Patents

Description

  The present invention relates to a multi-plate oil cooler, and more particularly to a stacked structure of multi-plate oil coolers.

  As an oil cooler for cooling engine oil or the like with water, LLC or the like, a so-called multi-plate oil cooler in which a large number of thin plates are stacked and an oil flow path and a cooling water flow path are alternately configured is known. Yes. The oil cooler is brazed in a furnace with a brazing material or the like provided on the surface of the plate.

  A conventional multi-plate oil cooler is disclosed in Patent Document 1, for example. The heat exchanger in such an oil cooler is configured by alternately stacking two types of plates including a first plate and a second plate. The outer peripheral portions of the first and second plates have a tapered fitting shape (referred to as an outer peripheral taper) that is sequentially stacked in order to close the oil flow path and the cooling water flow path. The first and second plates have a central communication hole for returning oil to the engine block or the like at the central portion, and have a tapered fitting shape (referred to as an inner peripheral taper) around the communication hole. .

  When a plurality of plates are stacked, the oil flow path and the cooling water flow path are isolated from each other by the sequentially fitted inner peripheral taper portion, and a continuous passage in the stacking direction for returning the oil after heat exchange to the engine block is configured. Is done.

JP 2002-332818 A

  In the conventional oil cooler described above, the first and second plates have a tapered fitting shape not only on the outer periphery but also on the inner periphery, and the plates are sequentially fitted on both the outer periphery taper and the inner periphery taper. Therefore, when a plurality of plates are stacked, even if a slight processing error occurs, the floating tends to occur at either the outer peripheral taper or the inner peripheral taper. That is, one taper portion (for example, outer peripheral taper) is in close contact with the entire circumference of the taper portion (for example, outer peripheral taper) of another adjacent plate, while the other taper portion (for example, inner peripheral taper) is Although it contacts a part of the taper part (for example, inner circumference taper) of other adjacent plates, it does not contact the other part. As a result, when a plurality of plates laminated as described above are brazed in a furnace, there is a problem that the non-contact portion is not sufficiently brazed.

In the present invention, a plurality of first plates and second plates having the same outer shape are alternately stacked, and oil flow paths and cooling water flow paths are alternately formed between adjacent plates. In the multi-plate oil cooler in which an independent oil passage through which oil flows in the laminating direction is formed by opening portions provided at predetermined positions of each plate in the laminating direction,
The first plate and the second plate are brazed to each other while the peripheral portions rising in a tapered shape are sequentially fitted,
Around the opening, a first sealing portion formed by brazing a first plate and a second plate adjacent to each other with an oil passage interposed therebetween, and a cooling water passage with each other The second sealing portion formed by brazing the adjacent first plate and second plate in an annular shape is arranged so as to be double in plan view,
Each of the first plate and the second plate includes an inner peripheral boss projecting into the oil flow path in the opposite directions along the periphery of the opening, and the inner peripheral boss An outer peripheral boss part that protrudes into the cooling water flow path in a direction opposite to the inner peripheral boss part continuously from the outer peripheral edge, and a transition part between the outer peripheral boss part and the inner peripheral boss part is , Extending vertically from the inner peripheral edge of the outer peripheral boss portion to the outer peripheral edge of the inner peripheral boss portion,
The inner peripheral boss of each of the adjacent first plate and second plate is brazed together to form the first sealing portion, and each of the adjacent first plate and second plate The outer peripheral bosses are brazed together to form the second sealing part, and the first sealing part and the second sealing part are parallel to the plate surface perpendicular to the stacking direction. and have a bonding surface having a constant width,
A fin plate having an opening corresponding to the opening of the plate is disposed in the oil flow path, and an edge of the opening is an annular space formed between two outer peripheral bosses. It is located inside and close to the transition part .

  In the present invention, the first plate and the second plate stacked on each other are positioned by sequentially fitting the peripheral portions rising in a tapered shape. Around the opening provided at a predetermined position of the first plate and the second plate, the oil flow path between the plates is sealed by the first sealing portion, and between the plates by the second sealing portion. The cooling water channel is sealed. Therefore, an oil passage extending in the stacking direction is configured. This oil passage is isolated from both the oil passage and the cooling water passage.

  Here, since the first sealing portion and the second sealing portion have joint surfaces parallel to the plate surface, their positions are not constrained in the parallel direction of the plate. Even if there is a dimensional error in the parallel direction, the error is absorbed.

  According to the present invention, even when there is a processing error in the position of the opening when positioned by the fitting of the peripheral edge, the plate does not float during brazing, and good brazing is realized. Can do.

1 is a perspective view of an embodiment of an oil cooler according to the present invention. The disassembled perspective view of the 1st and 2nd core plate in an oil cooler. Sectional drawing along the diagonal of an oil cooler. Sectional drawing of the oil cooler along a different diagonal. The expanded sectional view of the center part of a core plate .

  Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. In the following description, in order to facilitate understanding, terms such as “upper”, “lower”, “top”, and “bottom” are used on the basis of the posture of FIG. 1, but the oil cooler 10 of the present invention is used. Is not limited to the mounting posture of FIG.

  First, the basic configuration of the oil cooler 10 will be described. As shown in FIG. 1, the oil cooler 10 includes a core portion 1 that performs heat exchange between oil and cooling water, and an upper surface of the core portion 1. A relatively thick top plate 2 to be attached and a bottom plate 3 to be attached to the lower surface of the core portion 1 are roughly constituted.

  As shown in FIGS. 2 and 3, the core portion 1 is formed by alternately laminating a large number of first core plates 5 and second core plates 6 having a common basic shape. 6, the oil flow path 7 and the cooling water flow path 8 are alternately configured. In the illustrated example, a cooling water flow path 8 is configured between the lower surface of the first core plate 5 and the upper surface of the second core plate 6, and the lower surface of the second core plate 6 and the upper surface of the first core plate 5. An oil passage 7 is formed between the two. A fin plate 11 is sandwiched between each oil flow path 7.

  The first core plate 5 and the second core plate 6 are formed by press-molding a thin plate material made of an aluminum alloy, and as shown in FIG. Oil communication holes 12 are formed at two locations, and cooling water communication holes 13 are formed at two locations on different diagonal lines. In the first core plate 5, the periphery of the oil communication hole 12 is formed as a boss portion 14 so as to protrude toward the cooling water flow path 8, and the periphery of the cooling water communication hole 13 is defined as the boss portion 15. It is formed one step higher so as to protrude to the oil flow path 7 side. Similarly, in the second core plate 6, the periphery of the cooling water communication hole 13 is formed as a boss part 15 so as to protrude toward the oil flow path 7, and the periphery of the oil communication hole 12 is the boss part 14. Is formed so as to protrude to the cooling water flow path 8 side. Accordingly, the two kinds of core plates 5 and 6 are alternately combined, so that a constant interval for forming the flow paths 7 and 8 is maintained between the core plates 5 and 6.

  Here, the boss portions 14 around the oil communication holes 12 in the first core plate 5 are respectively joined to the boss portions 14 around the oil communication holes 12 in the adjacent second core plate 6. The two oil passages 7 communicate with each other and are isolated from the cooling water passage 8 between them. In this way, in a state where a large number of core plates 5 and 6 are joined, the oil flow paths 7 communicate with each other through a large number of oil communication holes 12, and the oil flows up and down in the core portion 1 as a whole. It will be able to flow in the direction.

  In each oil flow path 7, one of the pair of oil communication holes 12 serves as an oil inlet, and the other serves as an oil outlet. In the example shown in the figure, as shown in FIG. 3, one of the pair of oil communication holes 12 is blocked in the two core plates 5 and 6 at the middle portion and the uppermost portion of the core portion 1 in the stacking direction. The oil flows as a whole while making a U-turn left and right.

  Further, the cooling water communication hole 13 has the same configuration as that of the oil communication hole 12, and the boss portion 15 around the cooling water communication hole 13 in the second core plate 6 is adjacent to the first core plate 5. Are connected to the boss portions 15 around the cooling water communication hole 13, whereby the upper and lower cooling water flow paths 8 communicate with each other and are isolated from the oil flow path 7 between them. Therefore, in the state where a large number of core plates 5 and 6 are joined, the cooling water flow paths 8 communicate with each other via the large number of cooling water communication holes 13, and the cooling water flows vertically in the core portion 1 as a whole. To be able to flow through.

  The peripheral portions 5a and 6a of the respective core plates 5 and 6 are bent upward and are tapered outward, and in the state where the respective core plates 5 and 6 are stacked, the respective peripheral portions 5a and 6a are in close contact with each other.

  A central oil communication hole 17 is formed in a circular shape at the center of each of the core plates 5 and 6, and an inner peripheral boss 30 that is concentric along the periphery of the central oil communication hole 17 and An outer peripheral boss portion 32 is provided. In a state where the core plates 5 and 6 are laminated, the inner peripheral boss portion 30 and the outer peripheral boss portion 32 are in surface contact with the corresponding inner peripheral boss portion 30 and outer peripheral boss portion 32 in the adjacent core plates 5 and 6, respectively. A central oil passage 18 extending in the stacking direction is formed by overlapping the central oil communication holes 17 sequentially. Details of the inner peripheral boss portion 30 and the outer peripheral boss portion 32 of the core plates 5 and 6 will be described later.

  Further, a large number of protrusions 16 projecting toward the cooling water flow path 8 are formed on the core plates 5 and 6. The protrusion 16 has a truncated cone shape, and its height is equal to the height of the boss 14 described above, and in the assembled state, the top of the protrusion 16 of the first core plate 5 and the protrusion of the second core plate 6. The tops of the parts 16 are joined together by brazing. The protrusion 16 has a function of generating turbulent flow in the flow of cooling water and improving heat exchange efficiency, and contributes to improving the rigidity of the entire core portion 1. 3 and 4, the protrusion 16 is not shown.

  In the illustrated embodiment, the protrusions 16 are provided on both the core plates 5 and 6, but the protrusions 16 may be provided only on one of the core plates 5 and 6. In this case, the tops of the protrusions 16 provided on one core plate are joined to the plate surface of the other core plate by brazing.

  The fin plates 11 sandwiched between the oil flow paths 7 are substantially square shapes corresponding to the core plates 5 and 6, and correspond to the oil communication holes 12 and the cooling water communication holes 13 at four locations on the diagonal lines thereof. An opening (not shown) is formed in the opening, and an opening (not shown) corresponding to the central oil communication hole 17 is formed in the center. These openings are slightly larger than the communication holes 12, 13, and 17 so as to have a slight margin with respect to the bosses 15 and 30.

  As shown in FIGS. 3 and 4, the top plate 2 is further laminated on the top of the core portion 1. The top plate 2 includes a cooling water introduction pipe 21 that communicates with one of the pair of cooling water communication holes 13 at the top of the core section 1 and a cooling water discharge pipe 22 that communicates with the other. Further, the top plate 2 has a bulging portion 23 along one diagonal line, and by this bulging portion 23, one oil communication hole 12 at the top of the core portion 1 and the upper end of the central oil passage 18 are mutually connected. A communication path 19 that communicates is configured.

  As described above, a relatively thick bottom plate 3 having sufficient rigidity is laminated on the lower portion of the core portion 1. The bottom plate 3 includes an oil inlet 25 that opens corresponding to one of the oil communication holes 12 at the lowermost part of the core 1, and an oil outlet 26 that opens corresponding to the central oil passage 18.

  Accordingly, as the oil flow, oil that has become hot due to lubrication of each part of the internal combustion engine is introduced from the oil inlet 25 of the bottom plate 3 to the respective oil flow paths 7 of the core part 1, and adjacent cooling water flow paths. 8 is cooled by exchanging heat with the cooling water flowing through 8, and flows to the central oil passage 18 via the communication passage 19 by the bulging portion 23 of the top plate 2 and finally, the oil outlet of the bottom plate 3 26 is returned to the internal combustion engine side. It is also possible to reverse the oil flow so that high temperature oil is introduced into the central oil passage 18 and heat exchange is performed in the core portion 1 and then returned to the internal combustion engine from the lowermost oil communication hole 12. is there. Further, the cooling water is distributed from the cooling water introduction pipe 21 to the respective cooling water flow paths 8 through the cooling water communication holes 13 arranged vertically, and the inside of each cooling water flow path 8 from the one cooling water communication hole 13 to the other. It flows toward the cooling water communication hole 13 and finally flows out to the cooling water discharge pipe 22.

  The numerous core plates 5 and 6, the fin plate 11, the top plate 2, and the bottom plate 3 described above are joined and integrated with each other by brazing. Specifically, each of these parts is formed using a so-called clad material in which a brazing filler metal layer is coated on the surface of an aluminum alloy base material, and each part is heated in a furnace in a temporarily assembled state at a predetermined position. By doing so, it is brazed together.

  Note that the core plates 5 and 6 positioned at the uppermost and lowermost portions of the core portion 1 are general core plates 5 and 6 positioned at an intermediate portion of the core portion 1 due to the relationship with the top plate 2 and the bottom plate 3. It has a slightly different configuration.

  Next, with reference to FIG. 2 and FIG. 5, the structure of the center part of the core part 1 is demonstrated.

  As shown in FIG. 2, the first core plate and the second core plates 5, 6 have one circular central oil communication hole 17 in the central portion. Around the central oil communication hole 17, an annular inner peripheral boss part 30 along the peripheral edge of the central oil communication hole 17 and an annular outer peripheral boss part 32 positioned outside the inner peripheral boss part 30 are provided. It has been. The inner peripheral boss portion 30 and the outer peripheral boss portion 32 are concentric circles adjacent to each other.

  As shown in FIG. 5, in the first core plate 5, the inner peripheral boss portion 30 is formed so as to be one step higher from the plate surface toward the upper side, and protrudes to an intermediate position of the height of the oil flow path 7. ing. On the other hand, the outer peripheral boss portion 32 is formed so as to be lowered by one step from the plate surface toward the lower side, and protrudes to an intermediate position of the cooling water flow path 8. The outer peripheral boss part 32 and the inner peripheral boss part 30 are substantially continuous, and the transition part 34 between them is substantially perpendicular from the inner peripheral edge of the outer peripheral boss part 32 to the outer peripheral edge of the inner peripheral boss part 30. Extending in the direction.

  On the other hand, in the second core plate 6, the outer peripheral boss portion 32 is formed so as to be one step higher from the plate surface toward the upper side, and protrudes to an intermediate position of the cooling water flow path 8. On the other hand, the inner peripheral boss portion 30 is formed so as to be one step lower from the plate surface toward the lower side, and protrudes to an intermediate position of the height of the oil flow path 7. Similar to the first core plate 5, the outer peripheral boss part 32 and the inner peripheral boss part 30 are substantially continuous, and a transition part 34 between them is formed from the inner peripheral edge of the outer peripheral boss part 32 to the inner peripheral part. The boss portion 30 extends substantially vertically to the outer peripheral edge.

  Thus, the inner peripheral boss part 30 and the outer peripheral boss part 32 of the first and second core plates 5 and 6 protrude to the opposite sides with respect to the plate surface. And the inner peripheral boss part 30 and the outer peripheral boss part 32 in the first core plate 5 and the inner peripheral boss part 30 and the outer peripheral boss part 32 in the second core plate 6 are vertically symmetrical as shown in FIG. It is configured.

  The top portions of the inner peripheral boss portion 30 and the outer peripheral boss portion 32 of the first and second core plates 5 and 6 are both flat and parallel to the plate surfaces of the core plates 5 and 6. Therefore, the inner peripheral boss portion 30 of the first core plate 5 is in surface contact with the inner peripheral boss portion 30 of the adjacent second core plate 6 so as to define the oil flow path 7, and the first core The outer peripheral boss part 32 of the plate 5 is in surface contact with the outer peripheral boss part 32 of the adjacent second core plate 6 so as to define the cooling water flow path 8 together. These contact surfaces are finally brazed together.

  Therefore, in the present embodiment, an annular first sealing portion that seals the oil flow path 7 is constituted by the inner peripheral boss portion 30, and an annular shape that seals the cooling water flow passage 8 by the outer peripheral boss portion 32. A second sealing portion is configured. These first and second sealing portions are concentric in a plan view when the core portion 1 is viewed from above, that is, are arranged in an inner and outer double.

  In this embodiment, as shown in FIG. 5, the inner peripheral boss 30 of the first core plate 5 and the inner peripheral boss 30 of the adjacent second core plate 6 are the first and second They are surface-bonded to each other at an intermediate position of the height of the oil passage 7 defined by the core plates 5 and 6. Similarly, the outer peripheral boss portion 32 of the first core plate 5 and the outer peripheral boss portion 32 of the adjacent second core plate 6 have a cooling water flow defined by the first and second core plates 5 and 6. They are surface-bonded to each other at an intermediate position at the height of the path 8. That is, the distance from the plate surface of the first core plate 5 to the top surface of the inner peripheral boss portion 30 and the distance from the plate surface of the second core plate 6 to the top surface of the inner peripheral boss portion 30 are equal to each other. The distance from the plate surface of one core plate 5 to the top surface of the outer peripheral boss portion 32 is equal to the distance from the plate surface of the second core plate 6 to the top surface of the outer peripheral boss portion 32.

  When the plurality of core plates 5 and 6 are stacked, the central oil communication holes 17 are sequentially overlapped, and as a result, a central oil passage 18 penetrating through the core portion 1 is formed. As described above, the central oil passage 18 is a passage through which the cooled oil flows in the vertical direction. Further, the cooling water flow path 8 is held between the core plates 5 and 6 at regular intervals by the outer peripheral boss portion 32 of the core plates 5 and 6 and the boss portion 14 around the oil communication hole 12 in the core plates 5 and 6. The oil flow path 7 is held at regular intervals between the core plates 5 and 6 by the inner peripheral boss portion 30 of the core plates 5 and 6 and the boss portion 15 around the cooling water communication hole 13 in the core plates 5 and 6. .

  Thus, by providing two continuous boss portions 30 and 32 concentrically around the central oil communication hole 17 of the core plate, the central oil passage 18 and the oil flow path 7 and the cooling are formed in the central portion of the core plate. In addition to being isolated from the water flow path 8, the individual oil flow paths 7 and the cooling water flow paths 8 can be sealed.

  The first core plate 5 and the second core plate 6 are positioned with respect to each other by fitting the peripheral portions 5a and 6a having a tapered shape. Even if the central axis of the central oil communication hole 17 is deviated (when there is a dimensional error in the parts), since the planar boss portions 30 and 32 are in surface contact with each other, the horizontal misalignment is caused. This can be tolerated, and good brazing can be achieved.

  Further, since the floating of the core plates 5 and 6 is reduced at the time of brazing, positioning means by other jigs or the like can be minimized.

  Further, the central portion of the core plate is not the conventional tapered shape but the surface contact shape of the boss portions 30 and 32, so that the central portion of the uppermost core plates 5 and 6 adjacent to the top plate 2 is the core plate. Since it does not protrude high from the surface, the height of the bulging portion 23 of the top plate 2 can be lowered, and as a result, the height of the entire oil cooler can be lowered. In particular, in the illustrated example, as shown in FIG. 3, since the uppermost second core plate 6 does not include the outer peripheral boss portion 32, the height of the bulging portion 23 may be minimized. it can.

  As mentioned above, although one Example of this invention was described, this invention is not restricted to the said Example, A various change is possible.

DESCRIPTION OF SYMBOLS 1 Core part 2 Top plate 3 Bottom plate 5 1st core plate 6 2nd core plate 5a, 6a Peripheral part 7 Oil flow path 8 Cooling water flow path 11 Fin plate 12 Oil communication hole 13 Cooling water communication hole 14 Boss part 15 Boss portion 17 Central oil communication hole 18 Central oil passage 30 Inner peripheral boss portion 32 Outer peripheral boss portion 34 Transition portion

Claims (1)

A plurality of first plates and second plates having the same outer shape are alternately stacked, oil channels and cooling water channels are alternately formed between adjacent plates, and predetermined plates In the multi-plate oil cooler in which an independent oil passage through which oil flows in the laminating direction is formed by opening portions provided at positions being continuous in the laminating direction,
The first plate and the second plate are brazed to each other while the peripheral portions rising in a tapered shape are sequentially fitted,
Around the opening, a first sealing portion formed by brazing a first plate and a second plate adjacent to each other with an oil passage interposed therebetween, and a cooling water passage with each other The second sealing portion formed by brazing the adjacent first plate and second plate in an annular shape is arranged so as to be double in plan view,
Each of the first plate and the second plate includes an inner peripheral boss projecting into the oil flow path in the opposite directions along the periphery of the opening, and the inner peripheral boss An outer peripheral boss part that protrudes into the cooling water flow path in a direction opposite to the inner peripheral boss part continuously from the outer peripheral edge, and a transition part between the outer peripheral boss part and the inner peripheral boss part is , Extending vertically from the inner peripheral edge of the outer peripheral boss portion to the outer peripheral edge of the inner peripheral boss portion,
The inner peripheral boss of each of the adjacent first plate and second plate is brazed together to form the first sealing portion, and each of the adjacent first plate and second plate The outer peripheral bosses are brazed together to form the second sealing part, and the first sealing part and the second sealing part are parallel to the plate surface perpendicular to the stacking direction. and have a bonding surface having a constant width,
A fin plate having an opening corresponding to the opening of the plate is disposed in the oil flow path, and an edge of the opening is an annular space formed between two outer peripheral bosses. A multi-plate type oil cooler which is located inside and close to the transition portion .

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