JP7025913B2 - Oil cooler - Google Patents

Description

The present invention relates to a so-called multi-plate laminated oil cooler used for cooling, for example, lubricating oil for an internal combustion engine or hydraulic oil for an automatic transmission.

A general heat exchanger has a structure in which two media exchange heat and each medium has one outlet. For example, when the medium to be cooled is a heat exchanger in which engine oil is used, the cooled engine oil is discharged from one oil discharge port of the heat exchanger and enters the engine (internal engine). The engine oil introduced into the engine is used for cooling and lubricating each part through the oil passage in the engine block.

Here, when the heat exchanger has only one oil outlet, the engine oil having one temperature is supplied to each part of the engine, so that the oil having a temperature suitable for each part and each part should be supplied. Was impossible.

Further, in recent years, engine oil tends to have a high oil temperature with the aim of reducing friction for improving fuel efficiency. Further, around the piston, the piston may be cooled by a piston oil jet in order to suppress knocking. It is desirable that the engine oil used for the piston oil jet has a lower temperature for cooling the piston.

Therefore, in Patent Document 1, the piston cooling system is branched from the main lubrication circuit, a cooler is arranged in the passage after the branch, and the engine oil having a lower temperature than the engine oil in the main lubrication circuit is used for the oil jet. The possible configurations are disclosed.

Japanese Patent No. 2573773

However, in Patent Document 1, since the cooler is arranged in the piston cooling system branched from the main lubrication circuit, a separate cooler is required to cool the engine oil in the main lubrication circuit. In this case, a total of two coolers must be provided, which causes problems such as poor mountability and complicated engine oil circulation circuit.

In the oil cooler of the present invention, oil is introduced in an oil cooler having a heat exchange section in which a large number of core plates are laminated and an oil flow path between plates and a refrigerant flow path between plates are alternately configured between each core plate. A single oil inlet, a plurality of oil outlets for discharging the oil introduced from the oil inlet , a first refrigerant inlet into which the first refrigerant is introduced, and the first refrigerant are discharged. A first refrigerant discharge port, a second refrigerant introduction port into which a second refrigerant having a lower temperature than the first refrigerant is introduced, and a second refrigerant discharge port from which the second refrigerant is discharged. Each oil path from the oil introduction port to each oil discharge port is formed by the inter-plate oil flow path, and the first refrigerant path from the first refrigerant introduction port to the first refrigerant discharge port and the first refrigerant path. 2 The second refrigerant path from the refrigerant introduction port to the second refrigerant discharge port is configured by the inter-plate refrigerant flow path, and the amount of heat exchange of oil differs for each oil path from the oil introduction port to each oil discharge port. At the same time, the first refrigerant path and the second refrigerant path become independent cooling systems, the first refrigerant circulates in a predetermined first cooling circuit, and the second refrigerant circulates. 1 It is characterized in that it circulates in a predetermined second cooling circuit independent of the cooling circuit .

According to the present invention, it is possible to supply oil cooled to different temperatures by one oil cooler 1 to desired portions without complicating the oil circulation circuit.

An exploded perspective view of the oil cooler according to the first embodiment of the present invention. The plan view of the oil cooler in 1st Embodiment of this invention. A perspective view showing a part of the fin plate in an enlarged manner. Explanatory drawing which shows typically the cross section along the line AA of FIG. Explanatory drawing which shows typically the cross section along the line BB of FIG. An exploded perspective view of an oil cooler according to a second embodiment of the present invention. The plan view of the oil cooler in the 2nd Example of this invention. FIG. 7 is a cross-sectional view taken along the line CC of FIG. FIG. 6 is a cross-sectional view taken along the line DD of FIG. The explanatory view which shows the outline of the oil cooler of the 3rd Example of this invention schematically. The explanatory view which shows the outline of the oil cooler of the 4th Example of this invention schematically. The explanatory view which shows the outline of the oil cooler of the 5th Example of this invention schematically. The explanatory view which shows the outline of the oil cooler of the 6th Example of this invention schematically. The explanatory view which shows the outline of the oil cooler of the 7th Example of this invention schematically.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In the following description, for convenience of explanation, terms such as "top", "bottom", "top", and "bottom" are used with reference to the posture of FIG. 1, but the present invention is limited thereto. is not it.

FIG. 1 is an exploded perspective view of the oil cooler 1 according to the first embodiment of the present invention. FIG. 2 is a plan view of the oil cooler 1 according to the first embodiment of the present invention.

The oil cooler 1 which is a heat exchanger cools the engine oil of an internal combustion engine mounted on a vehicle, for example.

The oil cooler 1 is provided on a heat exchange unit 2 that exchanges heat between oil and cooling water as a refrigerant, a relatively thick top plate 3 attached to the upper surface of the heat exchange unit 2, and a lower surface of the heat exchange unit 2. It is roughly composed of a relatively thick bottom plate 4 to be attached.

In the heat exchange unit 2, a large number of first core plates 6 having a common basic shape and a large number of second core plates 7 are alternately laminated, and between the first core plate 6 and the second core plate 7. , The plate-to-plate oil flow path 9 and the plate-to-plate cooling water flow path 10 (plate-to-plate refrigerant flow path) are alternately configured.

In the oil cooler 1 of the first embodiment, eight inter-plate oil flow paths 9 and seven inter-plate cooling water flow paths 10 are formed in the heat exchange unit 2.

In the illustrated example, an interplate oil flow path 9 is formed between the lower surface of the first core plate 6 and the upper surface of the second core plate 7, and the upper surface of the first core plate 6 and the lower surface of the second core plate 7 are formed. An inter-plate cooling water flow path 10 is configured between the plates. A substantially square fin plate 8 is arranged in each plate-to-plate oil flow path 9.

In FIG. 1, the numbers of the first core plate 6, the second core plate 7, and the fin plate 8 are partially omitted.

A large number of first and second core plates 6 and 7, a top plate 3, a bottom plate 4, and a large number of fin plates 8 are joined to each other by brazing and integrated. Specifically, each of these parts is formed by using a so-called clad material in which a brazing material layer is coated on the surface of an aluminum alloy base material, and each part is temporarily assembled in a predetermined position and heated in a furnace. By doing so, it is brazed integrally.

The first core plate 6 and the second core plate 7 located at the uppermost portion and the lowermost portion of the heat exchange portion 2 are located at the intermediate portion of the heat exchange portion 2 due to the relationship with the top plate 3 and the bottom plate 4. The configuration is slightly different from the general first core plate 6 and second core plate 7.

The fin plate 8 in FIG. 1 is schematically drawn, and is formed as, for example, an offset type corrugated fin as shown in FIG.

That is, the fin plate 8 is a corrugated fin formed by bending one base material into a rectangular or U-shape at regular pitch intervals, and is particularly from an offset type corrugated fin in which the corrugated positions are displaced by half a pitch for each width. It has become.

The oil cooler 1 has an oil introduction portion 17 as a single oil introduction port for introducing oil and a plurality of oil discharge ports for discharging oil at the lower end, which is one end in the core plate stacking direction (vertical direction). It has a first oil discharge part 18a and a second oil discharge part 18b.

Further, the oil cooler 1 has a cooling water introduction unit 19 as a refrigerant introduction port for introducing cooling water and a refrigerant discharge port for discharging cooling water at the upper end, which is one end in the core plate stacking direction (vertical direction). It has a cooling water discharge unit 20 of the above.

21 in FIG. 1 is a cooling water introduction pipe connected to the cooling water introduction unit 19, and 22 in FIG. 1 is a cooling water discharge pipe connected to the cooling water discharge unit 20.

The first core plate 6 and the second core plate 7 are press-molded from a thin base material of an aluminum alloy, and form a substantially square shape as a whole, and have three oil passage holes 15 and two cooling water passage holes 16. have.

The oil passage hole 15 is composed of a first oil passage hole 25 located in the center of the core plate and a pair of second oil passage holes 26 located on the diagonal line of the core plate symmetrical with respect to the first oil passage hole 25. It has become.

The first oil passage hole 25 constitutes an oil return passage 24 (see FIGS. 4 and 5) that penetrates the heat exchange portion 2 in the core plate stacking direction and communicates with the second oil discharge portion 18b.

The second oil passage hole 26 is located on the outer edge of the core plate.

Further, in the second core plate 7 located at an intermediate position in the core plate stacking direction, one of the pair of second oil passage holes 26 is closed to form an oil blocking portion 28, and the other second oil passage hole 26 is an orifice 29. The opening diameter is relatively small.

Further, 30 in FIGS. 1 and 4 shows oil in which one of the pair of second oil passage holes 26 of the second core plate 7 located above the second core plate 7 having the oil closing portion 28 and the orifice 29 is closed. It is a closed part.

Due to these oil blockages 28 and 30, the eight plate-to-plate oil flow paths 9 are the upper side oil flow path group 12a composed of the upper two plate-to-plate oil flow paths 9 and the central two plate-to-plate oil flow paths. It is divided into an intermediate oil flow path group 12c composed of 9 and a lower oil flow path group 12b composed of four lower plate-to-plate oil flow paths 9. The intermediate oil flow path group 12c communicates with the lower oil flow path group 12b via the orifice 29.

Then, the upper oil flow path group 12a, the intermediate oil flow path group 12c, and the lower side oil flow path group 12b are connected in series. The inter-plate oil flow paths 9 in each oil flow path group are substantially connected in parallel with each other.

As shown in FIG. 4, the oil introduced from the oil introduction section 17 changes the flow direction in the heat exchange section 2 in a direction orthogonal to the core plate stacking direction, and is discharged from the first oil discharge section 18a. Further, a part of the oil introduced from the oil introduction unit 17 flows in the core plate stacking direction while changing the flow direction in a direction orthogonal to the core plate stacking direction and making a U-turn, and flows to the uppermost portion of the heat exchange unit 2. The oil is discharged from the second oil discharge unit 18b via the oil return passage 24. The arrow in FIG. 4 indicates the flow of oil.

More specifically, the oil introduced from the oil introduction section 17 has the first oil path 11a shown by a solid line from the lower oil flow path group 12b to the first oil discharge section 18a, and the lower oil flow path group 12b. Heat exchange is performed through either of the intermediate oil flow path group 12c and the second oil path 11b indicated by the broken line leading to the second oil discharge portion 18b via the upper oil flow path group 12a.

Since the oil flowing through the second oil passage 11b exchanges heat not only in the lower oil flow path group 12b but also in the intermediate oil flow path group 12c and the upper oil flow path group 12a, only the lower oil flow path group 12b The amount of heat radiation (heat exchange amount) is larger than that of the oil flowing through the first oil path 11a, and it is possible to cool the oil to a lower temperature. That is, in the first oil path 11a and the second oil path 11b, the second oil path 11b has more opportunities for heat exchange, and the amount of heat dissipated (heat exchange amount) of the oil differs for each path. .. In the first embodiment, the temperature of the oil discharged from the first oil discharge unit 18a corresponding to the second oil discharge port is the temperature of the oil discharged from the second oil discharge unit 18b corresponding to the first oil discharge port. Is higher than.

The oil flowing through the second oil path 11b flows in the heat exchange section 2 in the direction orthogonal to the core plate stacking direction, makes a U-turn, and flows in the core plate stacking direction as a whole, and is the most of the heat exchange section 2. It reaches the upper part, flows into the oil return passage 24 through the bulging portion 27 formed in the top plate 3, and is discharged from the second oil discharging portion 18b.

That is, the oil flowing through the second oil path 11b flows in the core plate laminating direction as a whole while making a U-turn left and right in the heat exchange portion 2.

The oil heat-exchanged in the first oil path 11a discharged from the first oil discharge section 18a is supplied to each section from the main gallery (not shown) as oil for cooling and lubricating the entire internal combustion engine (engine). Lubrication.

The oil that has been heat-exchanged in the second oil path 11b discharged from the second oil discharge unit 18b is used for cooling a piston or the like that requires oil having a lower temperature in the internal combustion engine (engine).

The cooling water passage hole 16 is located on the outer edge of the core plate and is formed from the first cooling water passage hole 31 and the second cooling water passage hole 32 formed on the diagonal line of the core plate which are symmetrical with respect to the center of the core plate. It has become. The cooling water passage hole 16 is formed on a diagonal line of the core plate, which is different from the oil passage hole 15.

In the heat exchange section 2, the first cooling water passage hole 31 is located directly below the cooling water introduction section 19. In the heat exchange unit 2, the second cooling water passage hole 32 is located directly below the cooling water discharge unit 20.

As shown in FIG. 5, one cooling water flow path group 13 (refrigerant flow path group) is configured by the seven inter-plate cooling water flow paths 10. The inter-plate cooling water flow paths 10 in the cooling water flow path group 13 are connected to each other in parallel. That is, in the heat exchange unit 2, the seven plate-to-plate cooling water flow paths 10 are connected in parallel with each other. The cooling water flow path group 13 discharges the cooling water introduced from the cooling water introduction unit 19 from the cooling water discharge unit 20. That is, the path through which the cooling water flows from the cooling water introduction section 19 to the cooling water discharge section 20 via the cooling water flow path group 13 corresponds to the cooling water path 14 (refrigerant path).

The cooling water introduced from the cooling water introduction unit 19 changes the direction of flow in the heat exchange unit 2 in a direction orthogonal to the core plate stacking direction, and is discharged from the cooling water discharge unit 20 on the opposite side.

In the first core plate 6, the periphery of each second oil passage hole 26 is formed as a boss portion 35 so as to project one step higher toward the inter-plate cooling water flow path 10 side, and the first and second cooling water passage holes are formed. The periphery of 31 and 32 is formed as a boss portion 38 one step higher so as to project toward the oil flow path 9 between the plates. Further, in the first core plate 6, the periphery of the first oil passage hole 25 is formed as a boss portion 36 one step higher so as to project to both the inter-plate cooling water flow path 10 side and the inter-plate oil flow path 9 side. There is.

In the second core plate 7, the periphery of the first and second cooling water passage holes 31 and 32 is formed as a boss portion 38 so as to protrude toward the inter-plate oil flow path 9 side, and each second oil is formed. The periphery of the passage hole 26 is formed as a boss portion 35 one step higher so as to project toward the inter-plate cooling water flow path 10 side. Further, in the second core plate 7, the periphery of the first oil passage hole 25 is formed as a boss portion 36 one step higher so as to project to both the inter-plate cooling water flow path 10 side and the inter-plate oil flow path 9 side. There is.

Therefore, by alternately combining the first core plate 6 and the second core plate 7, an inter-plate oil flow path 9 and an inter-plate cooling water flow path are provided between the first core plate 6 and the second core plate 7. A constant interval of 10 is maintained.

The boss portion 35 around the second oil passage hole 26 in the first core plate 6 is joined to the boss portion 35 around the second oil passage hole 26 in one of the adjacent second core plates 7. As a result, the upper and lower plate-to-plate oil flow paths 9 communicate with each other and are isolated from the plate-to-plate cooling water flow paths 10 between the two. Therefore, in a state where a large number of first core plates 6 and second core plates 7 are joined, basically, the oil flow paths 9 between the plates communicate with each other through a large number of second oil passage holes 26. At the same time, oil can be circulated in the heat exchange section 2 in the core plate stacking direction as a whole.

The boss portions 38 around the first and second cooling water passage holes 31 and 32 in the second core plate 7 are the bosses around the first and second cooling water passage holes 31 and 32 of one of the adjacent first core plates 6. Each is joined to the portion 38. As a result, the upper and lower plate-to-plate cooling water flow paths 10 communicate with each other and are isolated from the plate-to-plate oil flow paths 9 between the two. Therefore, in a state where a large number of first core plates 6 and a second core plate 7 are joined, the cooling water flow paths 10 between the plates are connected to each other through a large number of first and second cooling water passage holes 31 and 32. In addition to communicating with each other, cooling water can flow through the heat exchange unit 2 in the core plate stacking direction as a whole.

The boss portion 36 around the first oil passage hole 25 in the first core plate 6 is joined to the boss portion 36 around the first oil passage hole 25 in the adjacent upper and lower second core plates 7.

The boss portion 36 around the first oil passage hole 25 in the second core plate 7 is joined to the boss portion 36 around the first oil passage hole 25 in the adjacent upper and lower first core plates 6.

Therefore, in a state where a large number of first core plates 6 and second core plates 7 are joined, oil that penetrates the heat exchange portion 2 in the core plate stacking direction by each first oil passage hole 25 and each boss portion 36. The return passage 24 is configured. The oil return passage 24 does not directly communicate with the inter-plate oil flow path 9 between the first core plate 6 and the second core plate 7.

Further, the first core plate 6 and the second core plate 7 are formed with a large number of protrusions 43 protruding toward the inter-plate cooling water flow path 10.

The fin plate 8 sandwiched between the plate-to-plate oil flow paths 9 is formed with openings 44 corresponding to the three oil passage holes 15 and the two cooling water passage holes 16 at five locations. Each opening 44 is formed larger than the respective passage holes 15 and 16 so as to have some margin for the corresponding boss portions 35, 36 and 38.

As described above, the top plate 3 is laminated on the uppermost portion of the heat exchange portion 2. The top plate 3 has a cooling water introduction unit 19 communicating with the first cooling water passage hole 31 at the top of the heat exchange unit 2 and a cooling water discharge unit communicating with the second cooling water passage hole 32 at the top of the heat exchange unit 2. 20 and the above-mentioned bulging portion 27 are provided.

As described above, a relatively thick bottom plate 4 having sufficient rigidity is laminated on the lowermost portion of the heat exchange portion 2. The bottom plate 4 communicates with the oil introduction portion 17 communicating with one of the pair of oil passage holes 26, 26 at the bottom of the heat exchange portion 2 and the other of the pair of oil passage holes 26, 26 at the bottom of the heat exchange portion 2. A first oil discharge unit 18a is provided, and a second oil discharge unit 18b communicating with the first oil passage hole 25 at the lowermost part of the heat exchange unit 2 is provided.

The bottom plate 4 is attached to a cylinder block or the like (not shown) via a gasket or the like (not shown) that can seal around the oil introduction portion 17, the first oil discharge portion 18a, and the second oil discharge portion 18b.

In such an oil cooler 1 of the first embodiment, since the amount of heat dissipated (heat exchange amount) of oil differs between the first oil path 11a and the second oil path 11b, the oil is discharged from the second oil discharge unit 18b. The temperature of the oil can be made lower than the temperature of the oil discharged from the first oil discharge unit 18a.

Further, the oil cooler 1 exchanges heat of oil having a relatively large flow rate and a small temperature drop allowance in the first oil path 11a, and has a relatively small flow rate and a large temperature drop allowance in the second oil path 11b. Oil heat exchange can be performed.

Therefore, it is possible to supply oil cooled to different temperatures by one oil cooler 1 to each desired portion without complicating the oil circulation circuit.

More specifically, for example, it is possible to supply oils having different temperatures for lubricating each part in the internal combustion engine and for cooling the piston of the internal combustion engine. Therefore, the internal combustion engine is in an efficient state in terms of friction and combustion by reducing friction by lubricating oil with a relatively high temperature and suppressing knocking by cooling the piston with cooling oil having a relatively low temperature. It is possible to keep the temperature at a high level, and it is possible to improve fuel efficiency as a whole.

By providing the orifice 29, it is possible to set so that a required amount of low-temperature oil is discharged from the second oil discharge unit 18b. For example, lower temperature oil is required for cooling the piston of an internal combustion engine, but the amount (flow rate) required is smaller than that of oil for cooling or lubricating the entire internal combustion engine (engine). Therefore, the size (diameter) of the opening diameter of the orifice 29 may be set as necessary.

The setting position of the orifice 29 is not limited to the connecting portion between the intermediate oil flow path group 12c and the lower oil flow path group 12b, and for example, the outlet side of the upper oil flow path group 12a, that is, the uppermost portion. It may be provided in the first oil passage hole 25 or the second oil passage hole 26 of the first core plate 6 or the second oil passage hole 26 of the second core plate 7.

Further, it is also possible to use a normal second oil passage hole 26 without providing the orifice 29.

Hereinafter, other examples of the present invention will be described. The same components as those in the first embodiment described above are designated by the same reference numerals, and duplicate description will be omitted.

The oil cooler 50 of the second embodiment of the present invention will be described with reference to FIGS. 6 to 9.

FIG. 6 is an exploded perspective view of the oil cooler 50 in the second embodiment. FIG. 7 is a plan view of the oil cooler 50 in the second embodiment. FIG. 8 is a cross-sectional view taken along the line CC of FIG. FIG. 9 is a cross-sectional view taken along the line DD of FIG.

The oil cooler 50 of the second embodiment, which is a heat exchanger, is a multi-plate laminated heat exchanger similar to the oil cooler 1 of the first embodiment described above, but two of them are used with respect to the oil cooler 50. The first cooling water and the second cooling water having different temperatures are supplied from an independent cooling circuit. The first cooling water as the first refrigerant circulates in a predetermined first cooling circuit (not shown). The second cooling water as the second refrigerant circulates in a predetermined second cooling circuit (not shown), and has a lower temperature than the first cooling water when it is introduced into the oil cooler 50.

The oil cooler 50 is configured so that the first cooling water and the second cooling water do not merge inside.

That is, the oil cooler 50 has a first cooling water introduction unit 51 into which the first cooling water is introduced, and a first cooling water discharge unit 52 that discharges only the first cooling water introduced from the first cooling water introduction unit 51. A second cooling water introduction unit 53 into which the second cooling water is introduced, and a second cooling water discharge unit 54 for discharging only the second cooling water introduced from the second cooling water introduction unit 53. ing.

Further, in the oil cooler 50, among the introduced oils, the oil cooled by the first cooling water is discharged from the first oil discharge unit 55, and the oil cooled by the second cooling water is discharged from the second oil discharge unit 56. It has been discharged.

That is, the oil cooler 50 discharges the oil introduction unit 17 into which the oil is introduced, the first oil discharge unit 55 into which the oil cooled by the first cooling water is discharged, and the oil cooled by the second cooling water. It has a second oil discharge unit 56 and the like.

The oil cooler 50 has a heat exchange unit 2 that exchanges heat between oil and cooling water, a relatively thick top plate 3 that is attached to the upper surface of the heat exchange unit 2, and a comparison that is attached to the lower surface of the heat exchange unit 2. It is roughly composed of a thick bottom plate 4 and a thick bottom plate 4.

In the heat exchange unit 2, a large number of first core plates 6 having a common basic shape and a large number of second core plates 7 are alternately laminated, and between the first core plate 6 and the second core plate 7. , The plate-to-plate oil flow path 9 and the plate-to-plate cooling water flow path 10 (plate-to-plate refrigerant flow path) are alternately configured.

In the oil cooler 50 of the second embodiment, six inter-plate oil flow paths 9 and five inter-plate cooling water flow paths 10 are formed in the heat exchange unit 2.

In the illustrated example, an interplate oil flow path 9 is formed between the lower surface of the first core plate 6 and the upper surface of the second core plate 7, and the upper surface of the first core plate 6 and the lower surface of the second core plate 7 are formed. An inter-plate cooling water flow path 10 is configured between the plates. A substantially square fin plate 8 is arranged in each plate-to-plate oil flow path 9.

A large number of first and second core plates 6 and 7, a top plate 3, a bottom plate 4, and a large number of fin plates 8 are joined to each other by brazing and integrated.

The first core plate 6 and the second core plate 7 located at the uppermost portion and the lowermost portion of the heat exchange portion 2 are located at the intermediate portion of the heat exchange portion 2 due to the relationship with the top plate 3 and the bottom plate 4. The configuration is slightly different from the general first core plate 6 and second core plate 7.

The fin plate 8 in FIG. 6 is schematically drawn, and is formed as, for example, an offset type corrugated fin as shown in FIG.

The oil cooler 50 has an oil introduction portion 17 as an oil introduction port for introducing oil and a first oil discharge port as an oil discharge port for discharging oil at the lower end which is one end in the core plate stacking direction (vertical direction). It has a portion 55, and has a second oil discharge portion 56 as an oil discharge port for discharging oil at the upper end, which is an end portion on one side in the core plate stacking direction (vertical direction).

Further, the oil cooler 50 has a first cooling water introduction section 51 and a first cooling water discharge section 52 at the lower end, which is one end in the core plate stacking direction (vertical direction), and has a core plate stacking direction (vertical direction). ), A second cooling water introduction unit 53 and a second cooling water discharge unit 54 are provided at the upper end, which is one end of the above.

Reference numeral 57 in FIG. 6 is a second cooling water introduction pipe connected to the second cooling water introduction unit 53. 58 in FIG. 6 is a second cooling water discharge pipe connected to the second cooling water discharge unit 54. Reference numeral 59 in FIG. 6 is a second oil discharge pipe connected to the second oil discharge unit 56.

The first core plate 6 and the second core plate 7 are press-molded from a thin base material of an aluminum alloy, and form a substantially square shape as a whole, and have three oil passage holes 15 and two cooling water passage holes 16. have.

The oil passage hole 15 is composed of a first oil passage hole 25 located in the center of the core plate and a pair of second oil passage holes 26 located on the diagonal line of the core plate symmetrical with respect to the first oil passage hole 25. It has become.

The first oil passage hole 25 constitutes an oil return passage 24 (see FIGS. 8 and 9) that penetrates the heat exchange portion 2 in the core plate stacking direction.

In this second embodiment, although the oil return passage 24 is configured by the first oil passage hole 25, the upper end and the lower end of the oil return passage 24 are closed by the top plate 3 and the bottom plate 4, respectively, and the oil is removed. It does not function as a flow path for cooling water.

The second oil passage hole 26 is located on the outer edge of the core plate.

The first core plate 6 at the uppermost portion in the core plate stacking direction is formed so that one of the pair of second oil passage holes 26 is an orifice 60 and the opening diameter is relatively small.

One of the pair of second oil passage holes 26 is closed in the second core plate 7 at the intermediate position in the core plate stacking direction to form the oil closed portion 61.

Due to the oil blockage 61, the six inter-plate oil flow paths 9 are separated from the upper oil flow path group 12a including the upper two plate-to-plate oil flow paths 9 and the lower four plate-to-plate oil flow paths 9. It is divided into a lower oil flow path group 12b.

The upper oil flow path group 12a and the lower oil flow path group 12b are connected in parallel. The inter-plate oil flow paths 9 in each oil flow path group are substantially connected in parallel with each other.

Further, in FIGS. 6 and 9, 62 closes the first cooling water passage hole 31 and the second cooling water passage hole 32 of the first core plate 6 and the second core plate 7 at the intermediate positions in the core plate stacking direction. It is a cooling water blockage.

Due to these cooling water blocking portions 62, the five inter-plate cooling water flow paths 10 are the upper cooling water flow path group 63a composed of the upper two inter-plate cooling water flow paths 10 and the lower three inter-plate cooling water flow paths. It is divided into a lower cooling water flow path group 63b composed of 10.

The upper cooling water flow path group 63a and the lower cooling water flow path group 63b do not communicate with each other and are independent of each other. The inter-plate cooling water flow paths 10 in each cooling water flow path group are substantially connected in parallel with each other.

As shown in FIG. 8, the oil introduced from the oil introduction section 17 changes the flow direction in the heat exchange section 2 in a direction orthogonal to the core plate stacking direction, and is discharged from the first oil discharge section 55. Further, a part of the oil introduced from the oil introduction section 17 changes the flow direction in a direction orthogonal to the core plate stacking direction, and is discharged from the second oil discharge section 56. The arrow in FIG. 8 indicates the flow of oil.

More specifically, the oil introduced from the oil introduction section 17 passes through the first oil path 11a shown by the solid line from the lower oil flow path group 12b to the first oil discharge section 55, and the upper flow path group. 2 Heat exchange is performed through one of the second oil paths 11b shown by the broken line leading to the oil discharge section 56.

Since the oil flowing through the second oil path 11b exchanges heat with the second cooling water having a low temperature, the oil flowing through the first oil path 11a exchanges heat with the first cooling water having a relatively high temperature. Compared to this, the amount of heat radiation (heat exchange amount) is large, and it is possible to cool to a lower temperature. That is, in the first oil path 11a and the second oil path 11b, the temperature of the refrigerant whose heat is exchanged is lower in the second oil path 11b, and the amount of heat dissipated (heat exchange amount) of the oil is different for each path. different. In the second embodiment, the temperature of the oil discharged from the first oil discharge unit 55 is higher than the temperature of the oil discharged from the second oil discharge unit 56.

The oil heat-exchanged in the first oil path 11a discharged from the first oil discharge section 55 is supplied to each section from the main gallery (not shown) as oil for cooling and lubricating the entire internal combustion engine (engine). Lubrication.

The oil that has been heat-exchanged in the second oil path 11b discharged from the second oil discharge unit 56 is used for cooling a piston or the like that requires oil having a lower temperature in the internal combustion engine (engine).

The cooling water passage hole 16 is located on the outer edge of the core plate and is formed from the first cooling water passage hole 31 and the second cooling water passage hole 32 formed on the diagonal line of the core plate which are symmetrical with respect to the center of the core plate. It has become.

The first cooling water passage hole 31 located below the cooling water blocking portion 62 in the core plate stacking direction communicates with the first cooling water introduction portion 51, and is connected to the cooling water blocking portion 62 in the core plate stacking direction. Those located on the upper side communicate with the second cooling water introduction unit 53.

The second cooling water passage hole 32 located below the cooling water blocking portion 62 in the core plate stacking direction communicates with the first cooling water discharging portion 52, and is connected to the cooling water blocking portion 62 in the core plate stacking direction. Those located on the upper side communicate with the second cooling water discharge unit 54.

That is, due to the four cooling water blocking portions 62, the five inter-plate cooling water flow paths 10 are between the upper cooling water flow path group 63a including the upper two inter-plate cooling water flow paths 10 and the lower three plates. It is divided into a lower cooling water flow path group 63b including a cooling water flow path 10.

The upper cooling water flow path group 63a and the lower cooling water flow path group 63b are independent of each other and do not communicate with each other. That is, the oil cooler 50 is configured to be able to supply cooling water from cooling systems independent of each other. The inter-plate cooling water flow paths 10 in each oil flow path group are connected to each other in parallel.

The upper cooling water flow path group 63a discharges the cooling water introduced from the second cooling water introduction unit 53 from the second cooling water discharge unit 54.

The lower cooling water flow path group 63b discharges the cooling water introduced from the first cooling water introduction unit 51 from the first cooling water discharge unit 52.

In this second embodiment, since the lower temperature second cooling water is introduced from the second cooling water introduction unit 53, the first cooling water introduction unit 51 is the first refrigerant introduction port and the first cooling water discharge unit 52. Corresponds to the first refrigerant discharge port, the second cooling water introduction unit 53 corresponds to the second refrigerant introduction port, and the second cooling water discharge unit 54 corresponds to the second refrigerant discharge port.

As shown in FIG. 9, the path through which the cooling water flows from the first cooling water introduction section 51 to the first cooling water discharge section 52 via the lower cooling water flow path group 63b is the first cooling water path (first). It corresponds to the refrigerant path) 64. Further, the path from the second cooling water introduction section 53 to the second cooling water discharge section 54 via the upper cooling water flow path group 63a is shown by a broken line, and the cooling water flow path is the second cooling water path (second refrigerant path). Corresponds to 65.

The cooling water introduced from the first cooling water introduction section 51 changes the direction of flow in the heat exchange section 2 in a direction orthogonal to the core plate stacking direction, and is discharged from the first cooling water discharge section 52 on the opposite side. .. Further, the cooling water introduced from the second cooling water introduction unit 53 changes the direction of flow in the heat exchange unit 2 in a direction orthogonal to the core plate stacking direction, and is discharged from the second cooling water discharge unit 54 on the opposite side. Will be done.

In the first core plate 6, the periphery of each second oil passage hole 26 is formed as a boss portion 35 so as to project one step higher toward the inter-plate cooling water flow path 10 side, and the first and second cooling water passage holes are formed. The periphery of 31 and 32 is formed as a boss portion 38 one step higher so as to project toward the oil flow path 9 between the plates. Further, in the first core plate 6, the periphery of the first oil passage hole 25 is formed as a boss portion 36 one step higher so as to project to both the inter-plate cooling water flow path 10 side and the inter-plate oil flow path 9 side. There is.

In the second core plate 7, the periphery of the first and second cooling water passage holes 31 and 32 is formed as a boss portion 38 so as to protrude toward the inter-plate oil flow path 9 side, and each second oil is formed. The periphery of the passage hole 26 is formed as a boss portion 35 one step higher so as to project toward the inter-plate cooling water flow path 10 side. Further, in the second core plate 7, the periphery of the first oil passage hole 25 is formed as a boss portion 36 one step higher so as to project to both the inter-plate cooling water flow path 10 side and the inter-plate oil flow path 9 side. There is.

Therefore, by alternately combining the first core plate 6 and the second core plate 7, an inter-plate oil flow path 9 and an inter-plate cooling water flow path are provided between the first core plate 6 and the second core plate 7. A constant interval of 10 is maintained.

The boss portion 35 around the second oil passage hole 26 in the first core plate 6 is joined to the boss portion 35 around the second oil passage hole 26 in one of the adjacent second core plates 7. As a result, the upper and lower plate-to-plate oil flow paths 9 communicate with each other and are isolated from the plate-to-plate cooling water flow paths 10 between the two. Therefore, in a state where a large number of first core plates 6 and second core plates 7 are joined, the oil flow paths 9 between the plates communicate with each other through a large number of second oil passage holes 26, and as a whole, the oil flow paths 9 are communicated with each other. Oil can flow in the heat exchange section 2 in the core plate stacking direction.

The boss portions 38 around the first and second cooling water passage holes 31 and 32 in the second core plate 7 are the bosses around the first and second cooling water passage holes 31 and 32 of one of the adjacent first core plates 6. Each is joined to the portion 38. As a result, the upper and lower plate-to-plate cooling water flow paths 10 communicate with each other and are isolated from the plate-to-plate oil flow paths 9 between the two. Therefore, in a state where a large number of first core plates 6 and a second core plate 7 are joined, the cooling water flow paths 10 between the plates are connected to each other through a large number of first and second cooling water passage holes 31 and 32. Communicate.

The boss portion 36 around the first oil passage hole 25 in the first core plate 6 is joined to the boss portion 36 around the first oil passage hole 25 in the adjacent upper and lower second core plates 7.

The boss portion 36 around the first oil passage hole 25 in the second core plate 7 is joined to the boss portion 36 around the first oil passage hole 25 in the adjacent upper and lower first core plates 6.

Therefore, in a state where a large number of first core plates 6 and second core plates 7 are joined, oil that penetrates the heat exchange portion 2 in the core plate stacking direction by each first oil passage hole 25 and each boss portion 36. The return passage 24 is configured. However, in this second embodiment, both ends of the oil return passage 24 are blocked by the top plate 3 and the bottom plate 4, and are not used as a fluid flow path.

Further, the first core plate 6 and the second core plate 7 are formed with a large number of protrusions 43 protruding toward the inter-plate cooling water flow path 10.

The fin plate 8 sandwiched between the plate-to-plate oil flow paths 9 is formed with openings 44 corresponding to the three oil passage holes 15 and the two cooling water passage holes 16 at five locations. Each opening 44 is formed larger than the respective passage holes 15 and 16 so as to have some margin for the corresponding boss portions 35, 36 and 38.

As described above, the top plate 3 is laminated on the uppermost portion of the heat exchange portion 2. The top plate 3 has a second cooling water introduction portion 53 communicating with the first cooling water passage hole 31 at the uppermost portion of the heat exchange portion 2 and a second cooling water passage hole 32 communicating with the second cooling water passage hole 32 at the uppermost portion of the heat exchange portion 2. A cooling water discharge unit 54 and a second oil discharge unit 56 communicating with an orifice 60, which is one of a pair of second oil passage holes 26, 26 at the uppermost portion of the heat exchange unit 2, are provided.

As described above, a relatively thick bottom plate 4 having sufficient rigidity is laminated on the lowermost portion of the heat exchange portion 2. The bottom plate 4 communicates with the oil introduction portion 17 communicating with one of the pair of oil passage holes 26, 26 at the bottom of the heat exchange portion 2 and the other of the pair of oil passage holes 26, 26 at the bottom of the heat exchange portion 2. In the first oil discharge unit 55, the first cooling water introduction unit 51 communicating with the first cooling water passage hole 31 at the bottom of the heat exchange unit 2, and the second cooling water passage hole 32 at the bottom of the heat exchange unit 2. It is provided with a first cooling water discharge unit 52 that communicates with the first cooling water discharge unit 52.

Even in such a second embodiment, the same effect as that of the first embodiment described above can be obtained.

Further, in the oil cooler 50 of the second embodiment, since the cooling water can be supplied from the cooling systems independent of each other, it is possible to supply the oil at a lower temperature, and each part is set to the optimum temperature according to the application. Can be cooled.

The oil cooler 70 of the third embodiment of the present invention will be described with reference to FIG. FIG. 10 is an explanatory diagram schematically showing an outline of the oil cooler 70 of the third embodiment. In FIG. 10, the solid line arrow indicates the oil flow, and the broken line arrow indicates the cooling water flow.

The oil cooler 70 of the third embodiment, which is a heat exchanger, has substantially the same configuration as the oil cooler 50 of the second embodiment described above, but has a first oil discharge portion 55 via the lower oil flow path group 12b. A control valve 71 capable of controlling the oil flow rate is provided at a connection portion between the first oil path 11a leading to the oil path 11a and the second oil path 11b leading to the second oil discharge section 56 via the upper flow path group.

For example, as for the oil supplied to the piston of the internal combustion engine, it is desirable to supply oil having a lower temperature for cooling in the normal state, but it is possible to reduce the emission of particulate matter in the exhaust immediately after the start of the cooler. It is desirable to raise the temperature of the piston quickly. That is, in a state such as when the cold machine is started, the temperature rise of the piston is rather hindered by supplying cold oil to the piston of the internal combustion engine, and the exhaust performance deteriorates.

Therefore, in this third embodiment, the flow rate of the low-temperature oil discharged from the second oil discharge unit 56 is variably controlled by the control valve 71.

Therefore, in the oil cooler 70 of the third embodiment, a required amount of cold oil can be supplied from the second oil discharge unit 56 when necessary.

Further, also in the oil cooler 70 of the third embodiment, substantially the same action and effect as those of the oil coolers 1 and 50 of the first and second embodiments described above can be obtained.

The oil cooler 75 of the 4th embodiment of the present invention will be described with reference to FIG. FIG. 11 is an explanatory diagram schematically showing an outline of the oil cooler 75 of the fourth embodiment. In FIG. 11, the arrow indicated by the solid line indicates the flow of oil, and the arrow indicated by the broken line indicates the flow of cooling water.

The oil cooler 75 of the fourth embodiment, which is a heat exchanger, has substantially the same configuration as the oil cooler 50 of the second embodiment described above, but the second oil path 11b makes a U-turn in the core plate stacking direction. The oil is configured to flow and flow to the second oil discharge portion 56.

Further, the second oil path 11b of the fourth embodiment flows into the main passage 76 that exchanges heat with the second cooling water and the oil flows into the second oil discharge section 56 without exchanging heat with the second cooling water. One of the oil that has flowed through the main passage 76 and the oil that has flowed through the bypass passage 77 is provided in the second oil discharge portion 56 at the confluence of the bypass passage 77 and the main passage 76 and the bypass passage 77. It has a switching valve 78 for selecting and flowing in.

The main passage 76 is mainly composed of an inter-plate oil flow path 9. The bypass passage 77 is mainly composed of a second oil passage hole 26 and a boss portion 35 around the second oil passage hole 26.

In the oil cooler 75 of the fourth embodiment, the oil cooled by the first cooling water through the lower oil flow path group 12b, the lower oil flow path group 12b, and the upper oil flow path group 12a are provided. After that, either the first cooling water or the oil cooled by the second cooling water can be selected and discharged from the second oil discharge unit 56.

For example, immediately after starting the internal combustion engine, the oil supplied to the piston of the internal combustion engine is stopped. After the internal combustion engine is started, in a situation where the temperature of the engine oil rises due to the temperature rise of the cooling water, the oil cooled by the first cooling water is discharged to the second oil by passing through the lower oil flow path group 12b. It is supplied from the portion 56 to the piston. Then, when it becomes necessary to cool the piston further due to the subsequent rise in the piston temperature, the first cooling water and the second cooling water are used by passing through the lower oil flow path group 12b and the upper oil flow path group 12a. The cooled oil is supplied to the piston from the second oil discharge unit 56.

As described above, in the oil cooler 75 of the fourth embodiment, oil having a temperature suitable for the situation can be supplied from the second oil discharge unit 56 to the piston or the like.

Further, also in the oil cooler 75 of the fourth embodiment, substantially the same action and effect as those of the oil coolers 1 and 50 of the first and second embodiments described above can be obtained.

The oil cooler 80 of the fifth embodiment of the present invention will be described with reference to FIG. FIG. 12 is an explanatory diagram schematically showing an outline of the oil cooler 80 of the fifth embodiment. In FIG. 12, the arrow indicated by the solid line indicates the flow of oil, and the arrow indicated by the broken line indicates the flow of cooling water.

The oil cooler 80 of the fifth embodiment, which is a heat exchanger, has substantially the same configuration as the oil cooler 50 of the second embodiment described above, but the oil that has exchanged heat with the first cooling water and the second cooling water. It is configured so that the oil obtained by mixing the heat exchanged oil with the oil in an appropriate ratio can be discharged from the second oil discharge unit 56.

The second oil path 11b of the fifth embodiment has a main passage 81 that exchanges heat with the second cooling water, and the oil flows into the second oil discharge unit 56 without exchanging heat with the second cooling water. The bypass passage 82, which is provided at the confluence of the main passage 81 and the bypass passage 82, is provided in the second oil discharge section 56 by mixing the oil flowing through the main passage 81 and the oil flowing through the bypass passage 82. It has a control valve 83 that can flow.

In the oil cooler 80 of the fifth embodiment as described above, oil having an arbitrary temperature can be supplied from the second oil discharge unit 56 to the piston or the like.

Further, also in the oil cooler 80 of the fifth embodiment, substantially the same action and effect as those of the oil coolers 1 and 50 of the first and second embodiments described above can be obtained.

The oil cooler 85 of the sixth embodiment of the present invention will be described with reference to FIG. FIG. 13 is an explanatory diagram schematically showing an outline of the oil cooler 85 of the sixth embodiment. In FIG. 13, the arrow shown by the solid line indicates the flow of oil, and the arrow indicated by the broken line indicates the flow of cooling water.

The oil cooler 85 of the sixth embodiment, which is a heat exchanger, has substantially the same configuration as the oil cooler 50 of the second embodiment described above. 1 It is configured so that oil can flow into the oil discharge portion 55. That is, it is possible to change the oil temperature of the oil discharged from the first oil discharge unit 55.

The oil cooler 85 of the sixth embodiment includes a second bottom plate 86 and a control valve 88 for opening and closing a bypass passage 87 formed in the second bottom plate 86 between the bottom plate 4 and the heat exchange portion 2. have.

The bypass passage 87 is formed so that one end communicates with the oil introduction portion 17 and the other end communicates with the first oil discharge portion 55.

In the oil cooler 85 of the sixth embodiment as described above, in a situation where it is not necessary to cool the oil discharged from the first oil discharge section 55, the oil introduced from the oil introduction section 17 is diverted to the bypass passage 87. It is possible to prevent overcooling of the oil discharged from the first oil discharge unit 55.

Further, also in the oil cooler 85 of the sixth embodiment, substantially the same action and effect as those of the oil coolers 1 and 50 of the first and second embodiments described above can be obtained.

The oil cooler 90 of the 7th embodiment of the present invention will be described with reference to FIG. FIG. 14 is an explanatory diagram schematically showing an outline of the oil cooler 90 of the seventh embodiment. In FIG. 14, the arrow indicated by the solid line indicates the flow of oil, and the arrow indicated by the broken line indicates the flow of cooling water.

The oil cooler 90 of the seventh embodiment, which is a heat exchanger, has substantially the same configuration as the oil cooler 50 of the second embodiment described above, but the first cooling water introduced into the first cooling water introduction unit 51. And the flow rate of the second cooling water introduced into the second cooling water introduction unit 53 can be controlled.

The oil cooler 90 of the seventh embodiment has a first cooling water control valve 91 capable of adjusting the flow rate of the first cooling water and a second cooling water control valve 92 capable of adjusting the flow rate of the second cooling water. is doing. The first cooling water control valve 91 is arranged at a position adjacent to the first cooling water introduction portion 51. The second cooling water control valve 92 is arranged at a position adjacent to the second cooling water introduction unit 53. The first cooling water control valve 91 and the second cooling water control valve 92 correspond to the refrigerant control valve.

In the oil cooler 90 of the seventh embodiment as described above, the temperature of the oil discharged from the first oil discharge unit 55 is optimized by controlling the flow rate of the first cooling water with the first cooling water control valve 91. It can be adjusted to the temperature. Further, by controlling the flow rate of the second cooling water with the second cooling water control valve 92, the temperature of the oil discharged from the second oil discharge unit 56 can be adjusted to the optimum temperature.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments and can be modified in various ways. For example, the heat exchange unit 2 so that both the oil and the cooling water introduced into the heat exchange unit 2 flow in the core plate stacking direction while changing the flow direction in the direction orthogonal to the core plate stacking direction and making a U-turn. May be formed.

1 ... Oil cooler 2 ... Heat exchange part 3 ... Top plate 4 ... Bottom plate 6 ... First core plate 7 ... Second core plate 9 ... Plate-to-plate oil flow path 10 ... Inter-plate cooling water flow path 11a ... First oil path 11b ... Second oil path 12a ... Upper side oil flow path group 12b ... Lower side oil flow path group 12c ... Intermediate oil flow path group 13 ... Cooling water flow path group 14 ... Cooling water path 15 ... Oil passage hole 16 ... Cooling water passage hole 17 ... Oil introduction part 18a ... First oil discharge part 18b ... Second oil discharge part 19 ... Cooling water introduction part 20 ... Cooling water discharge part 23 ... Swelling part 24 ... Oil return passage 25 ... First oil passage hole 26 ... 2nd oil passage hole 28 ... Oil blockage 29 ... orifice 30 ... Oil blocker 31 ... 1st cooling water passage hole 32 ... 2nd cooling water passage hole 50 ... Oil cooler 51 ... 1st cooling water introduction section 52 ... 1st Cooling water discharge part 53 ... Second cooling water introduction part 54 ... Second cooling water discharge part 55 ... First oil discharge part 56 ... Second oil discharge part 60 ... orifice 61 ... Oil closing part 62 ... Cooling water closing part 63a ... Upper side cooling water flow path group 63b ... Lower side cooling water flow path group 64 ... First cooling water path 65 ... Second cooling water path

Claims (5)

In an oil cooler having a heat exchange section in which a large number of core plates are laminated and an oil flow path between plates and a refrigerant flow path between plates are alternately configured between each.
A single oil inlet where oil is introduced, and
Multiple oil outlets that discharge the oil introduced from the above oil inlet , and
The first refrigerant introduction port into which the first refrigerant is introduced, and
The first refrigerant discharge port from which the first refrigerant is discharged and the
A second refrigerant introduction port into which a second refrigerant having a lower temperature than the first refrigerant is introduced,
It has a second refrigerant discharge port from which the second refrigerant is discharged, and has a second refrigerant discharge port .
Each oil path from the oil inlet to each oil discharge port is formed by the inter-plate oil flow path.
The first refrigerant path from the first refrigerant introduction port to the first refrigerant discharge port and the second refrigerant path from the second refrigerant introduction port to the second refrigerant discharge port are configured by the inter-plate refrigerant flow path.
The amount of heat exchange of oil differs for each oil path from the oil introduction port to each oil discharge port, and the first refrigerant path and the second refrigerant path become independent cooling systems.
The first refrigerant circulates in a predetermined first cooling circuit.
The oil cooler is characterized in that the second refrigerant circulates in a predetermined second cooling circuit independent of the first cooling circuit . The plurality of oil discharge ports are a first oil discharge port and a second oil discharge port.
A first oil path from the oil introduction port to the first oil discharge port and a second oil path from the oil introduction port to the second oil discharge port are formed by the inter-plate oil flow path.
The oil cooler according to claim 1, wherein the temperature of the oil discharged from the first oil discharge port is lower than the temperature of the oil discharged from the second oil discharge port. The oil cooler according to claim 1 or 2 , wherein each of the first refrigerant path and the second refrigerant path is provided with a refrigerant control valve capable of controlling the flow rate of the introduced refrigerant. The oil cooler according to any one of claims 1 to 3 , wherein the oil path is provided with an orifice for adjusting the flow rate of oil discharged from each of the oil discharge ports. The oil cooler according to any one of claims 1 to 3 , wherein the oil path is provided with a control valve capable of controlling the flow rate of oil discharged from each of the oil discharge ports.

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