JP5629487B2 - oil cooler - Google Patents

Description

  The present invention relates to an oil cooler.

  An oil cooler is known in which an oil flow path and a cooling water flow path are alternately formed in the stacking direction by laminating a plurality of plate members and brazing the outer peripheral portion (see, for example, Patent Document 1). In this oil cooler, a U-turn portion is provided in the middle of the oil flow path, and fins are provided between the inlet port and the U-turn portion and between the U-turn portion and the outlet port.

JP 2009-103360 A

  In the above-described oil cooler, since the oil flow is reversed at the U-turn portion, if the volume of the U-turn portion is too small, the flow resistance becomes excessively high, resulting in a problem that the oil flow is deteriorated. Moreover, if the volume of the U-turn portion is sufficiently secured, the flow path resistance can be kept low, but the U-turn portion needs to be expanded in the surface direction, resulting in a problem that the oil cooler is enlarged.

  This invention is made | formed in view of such a situation, The objective is to attain size reduction, flowing oil smoothly.

In order to achieve the above object, the present invention provides an oil flow path through which oil flows between the plate members, and a cooling means for cooling the oil by laminating a plurality of plate members and joining outer peripheral portions. The cooling water flow path through which the cooling water flows is alternately formed, and the oil flow path is provided with an oil inlet through which the oil flows and an oil outlet through which the oil is discharged, and the oil flowing through the oil flow path An oil cooler comprising a heat transfer member that transfers the heat of the plate to the plate member, wherein the plate member is provided between the oil inlet and the oil outlet, and flows into the oil inlet side A weir section that partitions the side flow path and the discharge side flow path on the oil discharge port side, and is provided between the inflow side flow path and the discharge side flow path, and the oil flowing from the inflow side flow path is U Tar Is not flowed to the discharge side flow path, and a U-turn portion of the plan view semicircular ends of the U-turn portion side of the weir portion, the U end of the turn portion side of the heat transfer member A part of oil that is provided closer to the oil inlet and the oil outlet than the part and flows through the inflow side channel is discharged from the inflow side channel without passing through the U-turn part. Forming a bypass part for flowing into the side flow path, wherein the heat transfer member is disposed in each of the inflow side flow path and the discharge side flow path, and is not disposed in the U-turn part; and The first portion on the inflow side flow channel side and the second portion on the discharge side flow channel side are connected by a third portion arranged in the bypass portion .

According to the oil cooler of the present invention, a part of the oil that has flowed through the inflow side passage flows directly to the discharge side passage through the bypass portion without going to the U-turn portion when the dam portion is exceeded. In this way, by flowing a part of the oil from the inflow side flow path to the discharge side flow path without passing through the U turn part, it is possible to secure a flow rate of oil that tends to be insufficient only by the U turn part. That is, the oil flow rate can be secured without extending the U-turn portion in the surface direction. Therefore, it is possible to reduce the size while flowing the oil smoothly.

  Further, the amount of oil flowing from the inflow side flow path to the discharge side flow path can be adjusted at the position of the end portion of the weir portion on the U-turn portion side. For this reason, it is sufficient to determine the position of the end of the weir (the length of the weir) according to the viscosity of the oil to be cooled, and it is easy to deal with various oils having different viscosities.

Furthermore, since the 3rd part of a heat-transfer member is arrange | positioned at a bypass part , the rigidity of a bypass part can be improved with a 3rd part . In addition, the heat transfer area can be increased.

  In the above-described oil cooler, the plate member is configured in a rectangular shape in plan view, and a cooling water inlet and a cooling water inlet into the corner of the outer corner of the U-turn portion and the cooling water flow into the cooling water flow path. It is preferable that a cooling water discharge port for discharging cooling water from the water flow path is provided. In this oil cooler, the cooling water inflow port and the cooling water discharge port are provided in the corner portions that are not used in the U-turn portion, so that the limited space can be effectively utilized.

  According to the present invention, it is possible to reduce the size while flowing oil smoothly.

It is a figure which illustrates typically the positional relationship of an oil cooler, an oil filter, and an engine block. It is an external appearance perspective view of an oil cooler. It is a disassembled perspective view of an oil cooler. It is a disassembled perspective view of the state decomposed | disassembled for every plate unit. It is a disassembled perspective view of the state decomposed | disassembled for every plate. It is a disassembled perspective view of one plate unit. (A) is an external appearance perspective view of an oil cooler. (B) is sectional drawing of an oil cooler. It is a figure which shows the flow of oil. It is a figure which shows the flow of a cooling water.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the oil cooler 1 of this embodiment is attached to the engine block 3 via a case 2 made of aluminum die cast. An oil filter 4 is also attached to the case 2. Further, the case 2 is also provided with a flow path for cooling water (not shown). Therefore, the oil cooler 1 exchanges heat between the oil from the engine block 3 supplied through the case 2 and the cooling water, and returns the cooled oil to the engine block 3.

  As shown in FIG. 2, the oil cooler 1 is attached in a liquid-tight state to a mounting block 5 provided in the case 2. The oil cooler 1 is formed by laminating a plurality of plate members and joining necessary portions. That is, as shown in FIG. 3, the oil cooler 1 is formed by laminating and integrally joining plate members including a top flange 11, a top plate 12, a plate assembly group 13, a bottom plate 14, and an outer reinforcement 15. It is produced by.

  The top flange 11 is a portion joined to the case 2 and is formed of a rectangular metal plate material. In this embodiment, it is comprised with the board | plate material made from SUS by which the four corners were chamfered.

  And four openings which penetrate a plate | board thickness direction are provided in the inner side of the short side direction and the long side direction from the four corners of the top flange 11. Of these openings, two openings provided on one end side (the right side in FIG. 3) in the long side direction constitute oil outflow ports 11a and 11b through which oil flows. In the present embodiment, the lower opening in FIG. 3 is used as the oil inlet 11a, and the upper opening is used as the oil outlet 11b. Further, the two openings provided on the other end side in the long side direction (left side in FIG. 3) constitute cooling water outlets 11c and 11d through which the cooling water flows. In the present embodiment, the upper opening in FIG. 3 is used as the cooling water inlet 11c, and the lower opening is used as the cooling water outlet 11d.

  In addition to these four openings, a plurality of through-holes 11e for fixing with screws are formed in the peripheral portion of the top flange 11.

  The top plate 12 is a plate-like member disposed between the plate assembly group 13 and the top flange 11, and has a planar shape that is slightly smaller than the planar shape of the top flange 11.

  Openings are provided at the four corners of the top plate 12, respectively. Of these openings, two openings provided on one end side in the long side direction constitute oil outlets 12a and 12b through which oil flows. As with the top flange 11, the lower opening in FIG. 3 is used as the oil inlet 12a, and the upper opening is used as the oil outlet 12b. Also, the two openings provided on the other end side in the long side direction constitute cooling water outlets 12c and 12d through which the cooling water flows. That is, the upper opening in FIG. 3 is used as the cooling water inlet 12c, and the lower opening is used as the cooling water outlet 12d.

  Further, a ridge 12e (striped protrusion) is provided between the cooling water inlet 11c and the cooling water outlet 11d in the top plate 12 along the long side direction. The ridges 12e are provided in series from the short side closer to the cooling water outlets 12c and 12d to before the oil outlets 12a and 12b. In addition, the top plate 12 is provided with a plurality of protrusions 12f having the same height as the protrusions 12e in the same direction as the protrusions 12e.

  The top plate 12 is joined to the surface of the plate assembly group 13 (specifically, the surface of a female plate 22 described later) by brazing. That is, the peripheral portion of the top plate 12 is joined to the peripheral portion of the plate assembly group 13, and the protrusions 12 e and the protrusions 12 f are joined to the surface of the plate assembly group 13. The oil inlet / outlet ports 12a and 12b are joined to the surface of the plate assembly group 13 in a liquid-tight state. Thereby, a cooling water flow path through which cooling water flows is formed between the top plate 12 and the surface of the plate assembly group 13. That is, a series of flow paths are formed that return to the cooling water outlet 11d after making a U-turn at a location beyond the ridge 12e from the cooling water inlet 11c.

  As shown in FIG. 4, the plate assembly group 13 is produced by laminating a plurality of plate assemblies 21 (plate units). The plate assembly 21 is a plate-like member having an oil passage formed therein, and has a rectangular shape in plan view. Specifically, it has the same planar shape as the top plate 12 and has a thickness corresponding to the oil flow path provided inside. The plate assembly 21 is also provided with oil outlets 21a and 21b and cooling water outlets 21c and 21d at its four corners. These plate assemblies 21 are integrated in a stacked state. In the integrated state, a cooling water passage through which cooling water flows is formed between the plate assemblies 21. This cooling water channel is formed in the same shape as the cooling water channel formed between the top plate 12 and the plate assembly group 13. The plate assemblies 21 constituting the plate assembly group 13 will be described later.

  As shown in FIG. 3, the bottom plate 14 is a plate-like member disposed between the plate assembly group 13 and the outer reinforcement 15, and its planar shape is rectangular like the planar shape of the plate assembly group 13. Has been. On the bottom plate 14, protrusions 14 a and protrusions 14 b are formed toward the plate assembly group 13 side. Further, unlike the top plate 12, the bottom plate 14 is not provided with an oil outflow inlet or a cooling water outflow inlet, and an oil inflow port 21 a opened on the surface of the plate assembly group 13 or the like. A protrusion 14c that closes the oil outlet 21b is provided.

  The bottom plate 14 is joined to the plate assembly group 13 by brazing, and forms a cooling water flow path through which cooling water flows between the bottom plate 14 and the plate assembly group 13. That is, the outer peripheral portion of the bottom plate 14 is joined to the outer peripheral portion of the plate assembly group 13, and the protrusions 23 e and the protrusions 23 h formed on the surface of the plate assembly group 13 are formed on the surface of the bottom plate 14. A series of cooling water flow paths are formed which are joined to the ridges 14a and the protrusions 14b, make a U-turn from the cooling water inlet 21c over the tips of the ridges 14a and 23e, and return to the cooling water outlet 21d.

  The outer reinforcement 15 is a member joined to the surface of the bottom plate 14 and is provided to obtain a predetermined rigidity. The outer reinforcement 15 is made of the same rectangular metal plate as the bottom plate 14 in plan view. In this embodiment, it is comprised by the plate-shaped member made from SUS.

Next, the plate assembly 21 will be described.
As shown in FIG. 5, a female plate 22 (first plate) on the top plate 12 side, a mail plate 23 (second plate) on the bottom plate 14 side, and the female plate 22 and the mail plate 23 are arranged. The fins 24 (heat transfer members) are provided. The female plate 22 and the mail plate 23 are joined to each other by brazing. The fins 24 are housed in an internal space formed between the female plate 22 and the mail plate 23. This internal space corresponds to an oil passage through which oil flows.

Next, the female plate 22 will be described.
As shown in FIG. 6, the female plate 22 is a plate-like member that has the same rectangular shape as the top plate 12 in plan view. Similarly to the top plate 12, openings are also provided at the four corners of the female plate 22, and the two openings provided on one end side in the long side direction serve as oil outflow inlets 22a and 22b. Two openings provided on the other end side in the side direction serve as cooling water outflow ports 22c and 22d. Regarding the oil outlets 22a and 22b, the lower opening in FIG. 6 is used as the oil inlet 22a, and the upper opening is used as the oil outlet 22b. Regarding the cooling water outlet, the upper opening in FIG. 6 is used as the cooling water inlet 22c, and the lower opening is used as the cooling water outlet 22d.

  Between the cooling water inlet 22c and the cooling water outlet 22d in the female plate 22, a first protrusion 22e protruding toward the top plate 12 is provided along the long side direction. The first protrusions 22e are provided in series from the short side closer to the cooling water outlets 22c and 22d to the front side of the oil outlets 22a and 22b. This 1st protrusion 22e functions as a dam part which divides a cooling water flow path in the joining state of each plate member.

  Between the oil inlet 22a and the oil outlet 22b in the female plate 22, a second protrusion 22f protruding toward the bottom plate 14 is provided along the long side direction. The second protrusions 22f are provided in a series from the short side closer to the oil outflow ports 22a and 22b to the middle in the long side direction. As will be described later, the second ridge 22f is joined to the second ridge 23f on the mail plate 23 side in the joined state of each plate member, and functions as a dam section that divides the oil flow path. That is, the region on the oil inflow port 22a side becomes the oil inflow side flow channel and the region on the oil outflow port 22b side becomes the oil outflow side flow channel with the formation position of the second protrusion 22f as a boundary.

  A U-turn portion 22g is provided in the inner region of the cooling water outlets 22c and 22d in the female plate 22 adjacent to the outlet. The U-turn portion 22g is a portion that causes the oil that has flowed through the inflow side flow path to U-turn and flow into the outflow side flow path. The U-turn portion is formed as a substantially semicircular region in plan view, and a ¼ arc-shaped protrusion is provided on the bottom plate 14 side in this region. Specifically, it is a substantially semi-circular ridge formed of two 1/4 arc-shaped ridges, and three pairs of ridges having different radii are provided concentrically.

  And the bypass part 22h is formed between the U-turn part 22g and the 2nd protrusion 22f by positioning the edge part of the 2nd protrusion 22f mentioned above in the near side rather than the U-turn part 22g. The bypass part 22h is a part for allowing a part of the oil flowing through the inflow side flow path to flow from the inflow side flow path to the discharge side flow path without passing through the U-turn part 22g.

Next, the mail plate 23 will be described.
As shown in FIG. 6, the mail plate 23 is a plate-like member that has the same rectangular shape as the female plate 22 in plan view. In the same manner as the female plate 22, oil outlets 23 a and 23 b and cooling water outlets 23 c and 23 d are provided at four corners of the mail plate 23.

  Between the cooling water inlet 23c and the cooling water outlet 23d in the mail plate 23, a first protrusion 23e protruding toward the bottom plate 14 is provided along the long side direction. The first protrusions 23e are provided in series from the short side closer to the cooling water outlets 23c and 23d to the front side of the oil outlets 23a and 23b. Between the oil inlet 23a and the oil outlet 23b in the mail plate 23, a second protrusion 23f protruding toward the top plate 12 is provided along the long side direction. The second protrusions 23f are provided in a series from the short side closer to the oil outlets 23a and 23b to the middle in the long side direction. The second ridge 23f is joined to the second ridge 22f on the female plate 22 side, and functions as a dam section that divides the oil flow path.

  In the inner region of the cooling water outlets 23c and 23d in the mail plate 23, a U-turn portion 23g is provided adjacent to the outlets 23c and 23d. The U-turn portion 23g is formed as a substantially semicircular region in plan view, and a 1/4 arc-shaped protrusion is provided on the top plate 12 side in this region. Each protrusion is configured in the same manner as each protrusion provided on the U-turn portion 22g of the female plate 22. The tops of the protrusions of the U-turn portion 23g on the mail plate 23 side and the protrusions of the U-turn portion 22g on the female plate 22 side are joined to each other in the joined state of the plate members.

Next, the fin 24 will be described.
As shown in FIG. 6, the fin 24 has a rectangular wave-like cross-sectional shape, and forms a plurality of grooves through which oil flows. In addition, a plurality of holes are formed so that oil can go back and forth between the grooves. The fins 24 are produced by processing a SUS plate material, for example. The fin 24 includes a first portion 24a having a substantially rectangular shape corresponding to the inflow side flow passage, a second portion 24b having a substantially rectangular shape corresponding to the outflow side flow passage, and a third portion 24c corresponding to the bypass portion 22h. And have. That is, the fin 24 has a structure in which the first portion 24a and the second portion 24b are connected by the third portion 24c at the position of the bypass portion 22h. And about the 1st part 24a, the through-hole 24d is provided in the part corresponding to the oil inflow ports 22a and 23a, and about the 2nd part 24b, the through-hole 24e is provided in the part corresponding to the oil outflow ports 22b and 23b. It has been. Further, in the fin 24, the portions corresponding to the second ridge 22f of the female plate 22 and the second ridge 23f of the mail plate 23 are arranged so that the first portion 24a and the second portion 24b are spaced apart from each other. It has become. For this reason, in the joined state of each plate member, the oil outflow ports 22a, 22b, 23a, 23b are arranged facing the respective through holes 24d, 24e, and both the second protrusions 22f, 23f are formed. The dam portion is disposed in the gap between the first portion 24a and the second portion 24b. In other words, the dam portion is provided on the oil inlet / outlet side of the end of the fin 24 on the U-turn portion 22g, 23g side.

  The thickness of the fin 24 is equal to the height of the internal space formed by the female plate 22 and the mail plate 23. For this reason, in the joined state of each plate member, the fin 24 is brought into contact with each of the female plate 22 and the male plate 23. Further, the streak-like grooves of the fins 24 are provided in the long side direction of the female plate 22 and the mail plate 23. In addition, the fin 24 is provided with a plurality of holes that allow the grooves to communicate with each other. For this reason, the oil flowing in from the oil inflow ports 22a and 23a flows along the grooves of the fins 24 and also flows into the adjacent grooves through the holes. As a result, the oil flows while spreading in the oil flow path.

  Each plate member mentioned above, ie, top flange 11, top plate 12, plate assembly 21 (female plate 22, mail plate 23), bottom plate 14, and outer reinforcement 15 are joined by brazing. That is, the outer peripheral part of each plate member is joined, and the protrusions provided on each plate are also joined. Thereby, as shown to Fig.7 (a), it integrates and the oil cooler 1 is completed.

  In this oil cooler 1, as shown in FIG. 7B, an oil flow path 31 through which oil flows and a cooling water flow path 32 through which cooling water flows are alternately formed in the stacking direction of the plate members. For this reason, heat exchange occurs between the oil and the cooling water, and the oil is discharged in a cooled state. That is, as shown by the arrow in FIG. 8, the oil flows out from the oil outlet 22b through the oil inlet 22a, through the inflow channel, the U-turn portion 22g, and the outlet channel. Further, as shown in FIG. 9, the flow of the cooling water is regulated by a weir portion such as a first protrusion, and the cooling water outlet port passes through a substantially U-shaped cooling water passage in plan view from the cooling water inlet port 23 c. It flows out from 23d. Thus, the cooling water discharge side flow path is provided on the same side as the oil inflow side flow path, and the cooling water inflow side flow path is provided on the same side as the oil discharge side flow path. Therefore, the temperature difference between the oil and the cooling water can be secured over the entire flow path, and heat can be exchanged efficiently between the oil and the cooling water.

  In the present embodiment, the weir portion formed by the second protrusions 22f and 23f is provided in front of the end portions of the fins 24 on the U-turn portions 22g and 23g side. Part of the oil that has flowed through the side flow path does not go to the U-turn parts 22g and 23g when it passes over the weir part, but flows into the discharge side flow path through the bypass part 22h. In this way, by flowing a part of the oil from the inflow side flow path to the discharge side flow path without passing through the U turn parts 22g and 23g, the flow rate of the oil that tends to be insufficient only by the U turn parts 22g and 23g can be obtained. It can be secured. That is, since the flow path resistance can be suppressed by the bypass portion 22h without extending the U-turn portions 22g and 23g in the surface direction, the required flow rate of oil can be ensured. Therefore, the oil cooler 1 can be reduced in size while flowing oil smoothly.

  Further, the amount of oil flowing from the inflow side flow path to the discharge side flow path is determined by the position of the end portion on the U-turn part second protrusions 22g, 23g side (that is, the weir part) in the weir part (second protrusions 22f, 23f). Length). For this reason, it is sufficient to determine the length of the weir portion according to the viscosity of the oil to be cooled, and it is easy to deal with various oils having different viscosities.

  Furthermore, in this embodiment, the 3rd part 24c which connects the 1st part 24a and the 2nd part 24b of the fin 24 is provided in the position of the bypass part 22h (position on the U-turn part side from the weir part). Therefore, the rigidity of the bypass portion 22h can be increased by the third portion 24c. In addition, the heat transfer area can be increased.

  In addition, in the present embodiment, each plate assembly 21 is configured in a rectangular shape in plan view, and the cooling water inlets 22c and 23c and the cooling water discharge ports are provided at the corners outside the U-turn portions 22g and 23g. Since 22d and 23d are provided, it is possible to effectively utilize the corner space that is not used in the U-turn portions 22g and 23g but is a dead space.

  Although one embodiment of the present invention has been described above, this embodiment is intended to facilitate understanding of the present invention and is not intended to limit the present invention. The present invention can be changed and improved without departing from the gist thereof, and includes equivalents thereof.

  For example, in the above-described embodiment, the first portion 24a and the second portion 24b are connected by the third portion 24c with respect to the fin 24, but the first portion 24a and the second portion are not provided without the third portion 24c. You may comprise 24b as a separate member.

  In the above-described embodiment, the plate members are joined by brazing, but may be joined using other joining methods such as adhesion.

  Each plate member may be made of a material other than SUS. For example, you may produce using aluminum.

  Moreover, regarding the flow path of oil or cooling water, the direction of flow may be reversed by exchanging the inlet and the outlet. Further, the cooling water flow path may flow in one direction from one end side to the other end side in the longitudinal direction of the rectangular plane.

DESCRIPTION OF SYMBOLS 1 ... Oil cooler, 2 ... Case, 3 ... Engine block, 4 ... Oil filter, 5 ... Mounting block, 11 ... Top flange, 11a ... Oil inlet, 11b ... Oil outlet, 11c ... Coolant inlet, 11d ... Cooling Water outlet, 11e ... through hole, 12 ... top plate, 12a ... oil inlet, 12b ... oil outlet, 12c ... cooling water inlet, 12d ... cooling water outlet, 12e ... ridge, 12f ... protrusion, 13 ... plate assembly Group, 14 ... bottom plate, 14a ... ridge, 14b ... projection, 14c ... projection, 15 ... outer reinforcement, 21 ... plate assembly, 22 ... female plate, 22a ... oil inlet, 22b ... oil outlet, 22c ... Cooling water inlet, 22d ... Cooling water outlet, 22e ... First ridge, 22f ... Second ridge, 22g ... U-ter Part, 22h ... bypass part, 23 ... mail plate, 23c ... cooling water inlet, 23d ... cooling water outlet, 23e ... first protrusion, 23f ... second protrusion, 23g ... U-turn part, 23h ... protrusion, 24 ... Fin, 24a ... 1st part, 24b ... 2nd part, 24c ... 3rd part, 24d ... Through-hole, 24e ... Through-hole, 31 ... Oil flow path, 32 ... Cooling water flow path

Claims (2)

By laminating a plurality of plate members and joining the outer peripheral portions, an oil passage through which oil flows and a cooling water passage through which cooling water for cooling the oil flows alternately between the plate members Forming,
The oil passage is provided with an oil inlet through which the oil flows and an oil outlet through which the oil is discharged, and a heat transfer member that transmits heat of the oil flowing through the oil passage to the plate member An oil cooler,
The plate member is
A dam portion provided between the oil inlet and the oil outlet, and partitioning the inlet side channel on the oil inlet side and the outlet side channel on the oil outlet side;
A U-turn part having a semicircular shape in a plan view , provided between the inflow side flow path and the discharge side flow path, causes the oil flowing from the inflow side flow path to U-turn and flow to the discharge side flow path; Have
End of the U-turn portion side of the dam portion,
A part of the oil that has been provided in a position closer to the oil inlet and the oil outlet than the end of the heat transfer member on the U-turn portion side and has flowed through the inflow side passage is Form a bypass part to flow from the inflow side flow path to the discharge side flow path without passing through the turn part,
The heat transfer member is
A first portion on the inflow side flow channel side and a second portion on the discharge side flow channel side are disposed in each of the inflow side flow channel and the discharge side flow channel, and are not disposed in the U-turn portion. Are connected by a third portion arranged in the bypass portion . The plate member is
Cooling water that is configured in a rectangular shape in plan view and that discharges the cooling water from the cooling water inlet and the cooling water inlet that allows the cooling water to flow into the cooling water passage at the corners outside the U-turn portion. The oil cooler according to claim 1, wherein a discharge port is provided.