JP2011140915A - Oil cooler - Google Patents

Abstract

An object of the present invention is to achieve both a reduction in the thickness of the mounting base and securing of strength while the mounting base can be brazed to the core.
An oil cooler includes a core part 1 that performs heat exchange between oil and cooling water, and a plate-like mounting base part 2 that is brazed and joined to the bottom surface of the core part 1. It is fixed to the cylinder block 3 with bolts at the outer periphery. The mounting base 2 is divided into two divided plates 31 and 32 that are brazed and joined to each other on the mating surface 30. A steel reinforcing plate 33 having high strength is sandwiched between both plates. A concave portion 35 that is recessed in a direction away from the reinforcing plate 33 is formed in a corner portion of the plate accommodating portion 34 in which the reinforcing plate 33 is fitted with the mating surface 30, and a brazing fillet is formed in the concave portion 35. Let
[Selection] Figure 1

Description

  The present invention relates to an oil cooler used for cooling, for example, lubricating oil for an internal combustion engine or hydraulic oil for an automatic transmission.

  In Patent Document 1, for example, as an oil cooler for lubricating oil of an internal combustion engine or hydraulic oil for an automatic transmission, a large number of core plates are stacked to alternately configure an oil flow path and a cooling water flow path. A water-cooled oil cooler having a core portion is disclosed. In this oil cooler, a plate-like base plate as a mounting base is brazed to the bottom surface of the core portion, and is fastened to the cylinder block side by a plurality of bolts at the outer peripheral portion of the base plate. The core plate and the base plate constituting the oil cooler are formed of a material such as an aluminum alloy that is lightweight and can be brazed.

  Oil is supplied to the core from the cylinder block side through the oil communication passage formed through the base plate, and heat exchange is performed with the cooling water passage while flowing through the oil passage in the core. Similarly, it is returned to the cylinder block side through an oil communication passage formed through the base plate.

JP 2002-332818 A

  As described above, the base plate in the oil cooler having the conventional configuration is fixed to the cylinder block with the bolt at the outer peripheral portion, and the oil flows through the oil communication passage formed at a position closer to the center than the fixed position. Therefore, when a high oil pressure acts on the oil communication passage, a stress that pushes up the central portion of the base plate is generated. If the base plate bends due to this, a problem such as oil leakage or a decrease in fixing force is caused. There is a fear. In particular, when the oil filter housing chamber is recessed in the mounting seat surface on the cylinder block side to which the base plate is mounted as in Patent Document 1, the pressure receiving area of the base plate becomes large, and the above-described base plate It becomes easy to produce the deflection of. Further, even when the bolt fixing position on the base plate is far away from the core portion, the base plate is likely to bend.

  If the thickness of the base plate is excessively increased in order to prevent such deflection of the base plate, the height direction dimension of the oil cooler increases and the material cost increases. Further, if the base plate is formed of a material such as iron or stainless steel, which is superior in strength to the aluminum alloy, it cannot be brazed to the aluminum alloy constituting the core portion.

  Accordingly, an object of the present invention is to provide a novel oil cooler that can achieve both the thinning of the mounting base and the securing of strength while allowing the mounting base to be brazed to the core.

  Accordingly, the present invention provides a core part in which a large number of core plates are laminated, and an oil flow path and a cooling water flow path are alternately formed between them, and a plate that is brazed and joined to the bottom surface of the core part with a joint surface. In an oil cooler that is fastened to a mounting seat surface of a device in which oil is used by a plurality of bolts on the outer periphery of the mounting base, the mounting base is orthogonal to the joint surface Two divided plates that are brazed and joined to each other at a mating surface along the direction, and a reinforcing plate made of a material that is stronger than the two divided plates. It is characterized in that it is sandwiched between the two divided plates in a state of being fitted into a plate accommodating portion that is recessed in the mating surface of the divided plates.

  In order to ensure brazing joining between the two divided plates, preferably, a concave portion that is recessed in a direction away from the reinforcing plate is formed in a corner portion of the plate housing portion with the mating surface. ing. In this case, an appropriate fillet (filled portion) in which only the two divided plates are brazed and joined is formed in the recessed portion that is separated from the reinforcing plate, and the two divided plates are more reliably connected to each other. It can be brazed. Moreover, in the part in which the recessed part in a plate accommodating part is not formed, a reinforcement plate can be hold | maintained firmly, without wobbling because a reinforcement plate fits without gap substantially.

  In a preferred example of the oil cooler, the oil that connects the two divided plates and the reinforcing plate to the core-side oil passage that opens to the bottom surface of the core portion and the device-side oil passage that opens to the mounting seat surface of the device. A communication passage is formed through. In this case, the base plate may bend due to the high pressure of the oil in the oil communication path. However, according to the present invention, it is possible to ensure sufficient strength against the deflection by using the reinforcing plate. It becomes.

  According to the present invention, since the high-strength reinforcing plate is sandwiched between the two divided plates constituting the mounting base, the strength can be improved without excessively increasing the thickness of the mounting base. It is possible to achieve both the thinning of the mounting base and the securing of strength. In addition, since the reinforcing plate is held in a state where it is fitted in the plate receiving portion recessed in the mating surface, the two divided plates can be brazed and joined together with the core portion, and the reinforcing plate is joined separately. There is no need to do.

Sectional drawing which shows the oil cooler which concerns on one Example of this invention. The top view which shows the lower side division | segmentation plate of the said Example alone. Sectional drawing which expands and shows the recessed part vicinity of FIG. Sectional drawing which shows the vicinity of the recessed part which concerns on the other Example of this invention.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an oil cooler according to an embodiment of the present invention. The oil cooler is configured to be directly attached to a cylinder block 3 of an internal combustion engine as a device in which oil is used, and includes a core portion 1 that performs heat exchange between the oil and cooling water, and the core portion 1. And a plate-like mounting base 2 located at the bottom of the.

  The core unit 1 is formed by laminating a large number of core plates 5, and oil flow paths 6 and cooling water flow paths 7 are alternately formed between the core plates 5. Specifically, the core plate 5 has a substantially rectangular shape as a whole, and oil communication holes 8 are formed at two locations on the diagonal, and at two locations on different diagonals, at the top of the core portion 1. A cooling water communication hole (not shown) communicating with the attached cooling water pipe 9 is formed as an opening. The core plate 5 is divided into two types, that is, the above-described oil communication hole 8 and the cooling water communication hole are formed one step higher as the boss portion 10 and the flat plate, and these two types of core plates 5 are provided. The plates 5 are alternately combined, so that a certain interval serving as a flow path is maintained between the core plates 5. And between the two adjacent core plates 5, the respective oil communication holes 8 are in positions that are coincident with each other, and the core plates are adjacent so that the periphery of the boss portion 10 surrounds each oil communication hole 8. 5 is joined. As a result, the oil flow paths 6 communicate with each other through a large number of oil communication holes 8, and the oil can flow vertically in the core portion 1 as a whole. Although the cooling water communication holes are not shown in FIG. 1, the cooling water communication holes have exactly the same configuration so that the cooling water flows vertically in the core portion 1 and also flows in the respective cooling water flow paths 7. It has become.

  A fin plate 11 is sandwiched between each oil flow path 6. The peripheral edge 5a of the core plate 5 is tapered, and the peripheral edges 5a are in close contact with each other when the core plates 5 are stacked. In addition, a tapered cylindrical portion 5b protruding in a substantially conical shape is provided at the center portion of each core plate 5, and a plurality of tapered cylindrical portions 5b sequentially overlap each other so as to penetrate the core portion 1 vertically. A central oil passage 14 is formed. The central oil passage 14 does not communicate with the oil flow path 6 between the core plates 5.

  A top plate 15 is laminated on the uppermost core plate 5 of the core portion 1. The top plate 15 is attached with the cooling water pipe 9 and closes one oil communication hole 8. And the top plate 15 has the bulging part 15a along one diagonal line, and, thereby, the upper communication path 16 which connects the other oil communication hole 8 and the upper end of the center oil path 14 is comprised. .

  A relatively thick plate-like mounting base 2 having sufficient rigidity is laminated under the lowermost core plate 5. The mounting base portion 2 has a flange portion 17 on the outer peripheral portion extending outward from the core plate 5, and the flange portion 17 is fastened to the flat mounting seat surface 3 a of the cylinder block 3 by a plurality of bolts 18. It is supposed to be fixed.

  In addition, the mounting base 2 is formed with a first oil communication passage 19 and a second oil communication passage 20 penetrating in the plate thickness direction. The first oil communication passage 19 includes a first oil passage (device-side oil passage) 21 that opens to the mounting seat surface 3 a of the cylinder block 3, and a central oil passage (core-side oil passage) 14 that opens to the bottom surface of the core portion 1. The second oil communication passage 20 includes a second oil passage (device-side oil passage) 22 that opens to the mounting seat surface 3a of the cylinder block 3 and an oil communication hole (core) that opens to the bottom surface of the core portion 1. Side oil passage) 8. The oil that has become hot due to lubrication of each part of the internal combustion engine is introduced from the first oil passage 21 into the core portion 1 through the first oil communication passage 19, and is passed through the central oil passage 14 and the communication passage 16 to one oil. After flowing from the communication holes 8 to a number of oil flow paths 6 and exchanging heat with the cooling water flowing through the cooling water flow paths 7, it is cooled and then passed through the second oil communication paths 20 from the other oil communication holes 8. Finally, it flows to the second oil passage 22.

  In addition, seal rings 23 and 24 for preventing oil leakage are respectively provided at the opening peripheral edge of the first oil passage 21 and the opening peripheral edge of the second oil passage 22.

  Next, the structure of the mounting base 2 which is a characteristic configuration of the present embodiment will be described with reference to FIGS. This attachment base 2 is brazed and joined to each other at a mating surface 30 along the direction orthogonal to the joint surface 2a to be joined to the bottom surface of the core portion 1, that is, the direction perpendicular to the plate thickness (the left-right direction in FIG. 1). The plate 31 and the upper divided plate 32 are divided, and between these two divided plates 31, 32, a material mainly composed of iron or stainless steel having higher strength than the divided plates 31, 32 is used. The plate-shaped reinforcing plate 33 is sandwiched.

  The dividing plates 31 and 32 are thin plate-like members having the same outer shape, and are formed of an aluminum alloy material that can be brazed, like the core plate 5 and the like. That is, the above-described many core plates 5, fin plates 11, top plate 15, cooling water pipe 9, and divided plates 31, 32 are made of an aluminum alloy or a clad material having a brazing material layer formed on its surface, By brazing inside, each part is joined integrally.

  The bolt holes 18a through which the bolts 18 pass are formed through the flange portions 17 of the divided plates 31 and 32, respectively, and the oil communication passages 19 and 20 are reinforced with the divided plates 31 and 32, respectively. The plate 33 is formed so as to penetrate the plate 33, and each of the divided plates 31 and 32 is joined with the reinforcing plate 33 interposed therebetween, so that each constitutes one hole / communication path.

  In each of the divided plates 31 and 32, a plate housing portion 34 into which the reinforcing plate 33 is fitted is recessed in the mating surface 30. In this embodiment, shallow plate-type plate accommodating portions 34a and 34b are formed on both divided plates 31 and 32, respectively. The total of the depth (height) dimensions in the plate thickness direction of both plate accommodating portions 34a and 34b is substantially equal to the plate thickness direction dimension of the reinforcement plate 33 so that the reinforcement plate 33 does not wobble up and down. More specifically, the dimensions are set to be slightly larger.

  One first plate accommodating portion 34a formed in the lower divided plate 31 is equivalent to the outer shape of the reinforcing plate 33 and more precisely slightly larger so that the reinforcing plate 33 can be fitted with substantially no gap. Dimension is formed. On the other hand, the other second plate housing portion 34 b formed on the upper divided plate 32 is formed to be slightly larger than the outer shape of the first plate housing portion 34 a and the reinforcing plate 33. As a result, as shown in FIG. 3, the inner wall surface 37 in the second plate housing portion 34 b is retracted in a direction away from the reinforcing plate 33 than the inner wall surface 36 in the first plate housing portion 34 a, and the upper divided plate 32. A concave portion 35 that is recessed in a direction away from the reinforcing plate 33 is formed at a corner portion of the second plate housing portion 34 b with the mating surface 30.

  Accordingly, a corner portion where the lower divided plate 31 and the upper divided plate 32 are in direct contact with each other at a position away from the reinforcing plate 33 is formed in the concave portion 35, and the corner portion is brazed at the time of brazing. A suitable braze fillet 38 is formed. By such a brazing fillet 38, the two divided plates 31 and 32 can be reliably brazed and joined without being affected by the reinforcing plate 33 that is not brazed. Further, the reinforcing plate 33 is fitted into the first plate housing portion 34a of the lower divided plate 31 without the recess 35 with substantially no gap, so that the reinforcing plate 33 wobbles in the plate housing portion 34 after the brazing joint. The oil communication paths 19 and 20 formed in the divided plates 31 and 32 and the reinforcing plate 33 are not shifted from each other.

  And since the reinforcing plate 33 with high strength is sandwiched between the two divided plates 31 and 32 constituting the mounting base 2, the strength of the mounting base 2 is improved without excessively increasing the thickness. Thus, the attachment base 2 can be made thin and the strength can be ensured. Thereby, even when high pressure is received from the oil flowing in the central first oil passage 21, the deflection of the mounting base 2 is suppressed, and the mounting seat surface 3a of the cylinder block 3 through the seal rings 23, 24 It is possible to maintain good sealing performance.

  Further, since the reinforcing plate 33 is held in a state of being fitted to the plate accommodating portion 34 that is recessed in the mating surface 30, the two divided plates 31 and 32 can be brazed and joined together with the core portion 1. The reinforcing plate 33 does not need to be separately joined, and its manufacture is extremely easy.

  Further, when the reinforcing plate 33 made of a high strength material such as iron is exposed to the outside, the reinforcing plate 33 is likely to be corroded due to a potential difference at the contact portion with the aluminum alloy. The liquid is contained between the two divided plates 31 and 32 in a liquid-tight manner, and the brazing fillet 38 formed in the concave portion 35 reliably blocks entry of water or the like into the plate housing portion 34. Therefore, corrosion of the reinforcing plate 33 is not caused.

  FIG. 4 shows another embodiment of the plate accommodating portion and the recess. In this embodiment, the plate accommodating portion 41 is formed only on one lower divided plate 31, and the mating surface 30 of the other upper divided plate 32 is a flat surface. For this reason, the lower divided plate 31 is thicker than the upper divided plate 32 by the amount of the plate accommodating portion 41.

  A concave portion 42 that is recessed in a direction away from the reinforcing plate 33 is formed at a corner portion of the plate accommodating portion 41 with the mating surface 30. That is, the concave portion 42 is formed by forming the inner wall surface of the plate accommodating portion 41 in a stepped manner.

  Even in this case, an appropriate braze fillet 43 is formed at the corner of the recess 42 where the two divided plates 31 and 32 are in contact with each other, as in the embodiment of FIGS. Thus, both the divided plates 31 and 32 can be firmly brazed and joined, so that the penetration of water or the like into the plate accommodating portion 41 can be reliably blocked.

  As described above, the present invention has been described based on the specific embodiments. However, the present invention is not limited to the above-described embodiments, and includes various modifications and changes. For example, the oil flow may be reversed from that in the above embodiment, and the oil may be introduced from the second oil passage 22 to the core portion 1 and discharged to the first oil passage 21.

  Furthermore, in the above-described embodiment, the oil is introduced into and discharged from the core portion 1 by providing the first and second oil communication passages in the attachment base portion 2, but the oil communication passage is formed on the top plate 15 side, Even when cooling water and oil are introduced and discharged intensively on the mounting plate 15 side, if the mounting base 2 is subjected to vibration from oil, cooling water, etc., it is necessary to make the mounting base thick. In this case, the present invention can be effectively implemented as a vibration countermeasure.

  Moreover, in the said Example, although the bolt hole 18a which fixes the attachment base 2 was penetrated and formed in the position which avoids the reinforcement plate 33 in the attachment base 2, it forms so that a bolt hole may be penetrated and formed in a reinforcement plate. The reinforcing plate may be enlarged. In this case, the fastening force by the bolt can be further increased.

DESCRIPTION OF SYMBOLS 1 ... Core part 2 ... Mounting base 3 ... Cylinder block 5 ... Core plate 6 ... Oil flow path 7 ... Cooling water flow path 8 ... Oil communication hole (core side oil path)
14 ... Central oil passage (core side oil passage)
DESCRIPTION OF SYMBOLS 18 ... Bolt 19 ... 1st oil communication path 20 ... 2nd oil communication path 21 ... 1st oil path (apparatus side oil path)
22 ... Second oil passage (device side oil passage)
DESCRIPTION OF SYMBOLS 31 ... Lower side division plate 32 ... Upper side division plate 33 ... Reinforcement plate 34 ... Plate accommodating part 35 ... Recessed part 41 ... Plate accommodating part 42 ... Recessed part

Claims (3)

Laminating a large number of core plates, a core part that alternately constitutes an oil flow path and a cooling water flow path between them, a plate-like mounting base that is brazed and joined to the bottom surface of the core part with a joint surface, In an oil cooler that is fastened to a mounting seat surface of a device in which oil is used by a plurality of bolts at the outer peripheral portion of the mounting base,
The mounting base is
Two divided plates that are brazed to each other at a mating surface along the orthogonal direction of the joint surface;
A reinforcing plate made of a material having a higher strength than the two divided plates,
The oil cooler is characterized in that the reinforcing plate is sandwiched between the two divided plates in a state where the reinforcing plate is fitted in a plate housing portion recessed in the mating surface of the two divided plates.   2. The oil cooler according to claim 1, wherein a concave portion that is recessed in a direction away from the reinforcing plate is formed at a corner portion of the plate housing portion with the mating surface.   The two divided plates and the reinforcing plate are formed with an oil communication passage through which a core-side oil passage that opens to the bottom surface of the core portion communicates with a device-side oil passage that opens to the mounting seat surface of the device. The oil cooler according to claim 1 or 2, wherein the oil cooler is provided.

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