JP4614830B2 - Oil cooler - Google Patents

Description

  The present invention relates to an oil cooler, and more particularly to an oil cooler accommodated in a radiator tank.

Conventionally, a technique for accommodating an oil cooler in a radiator tank is known (see Patent Documents 1 to 3).
Such an oil cooler has a heat exchange part in which a passage is formed by stacking a plurality of elements in a state where the end portions of the element part are in communication with each other, and a pipe attachment hole provided in the radiator tank. It is configured to have a cylindrical pipe connector that faces and a connection pipe that faces the passage through the pipe connector. Normally, the connection pipe has a seal member interposed between the pipe connector and the pipe connector. The connection pipe is fixed by screwing into the pipe connector.
JP 2001-272195 A Japanese Patent Application Laid-Open No. 2002-195783 Japanese Patent No. 324539

  However, in the conventional invention, there is a problem that it takes much time to manage the tightening torque when the connection pipe is screwed to the pipe connector and the management of the biting of the seal member.

In addition, since the pipe connector is a dedicated part corresponding to only one type of connection pipe, there is a problem in that it is necessary to design and manufacture each time the connection pipe has a different diameter, resulting in high costs.
Accordingly, there has been a demand to make the pipe connector a common part that can accommodate connection pipes of various diameters.

  Furthermore, in the conventional invention, since the heat exchange part and the tank are fixed using a separate member from the pipe connector, the number of parts increases, and the pipe connector, the heat exchange part, and the tank are highly accurate. If not assembled, there was a problem that it would lead to poor brazing or oil leakage.

  The present invention has been made paying attention to the above-mentioned problems, and the object of the present invention is to easily fix the connection pipe to cope with connection pipes of various diameters, and at the same time, without using a separate member. An object of the present invention is to provide an oil cooler including a pipe connector capable of fixing an exchange part and a tank.

In order to solve the above-mentioned problem, in the invention according to claim 1, a heat exchange part in which a passage is formed by stacking a plurality of elements in a state where the end parts of the element part are in communication with each other, and a pipe attachment provided in the radiator tank A cylindrical pipe connector provided facing the passage through the outermost element portion of the heat exchange part in a state of passing through the hole, and a connection pipe provided facing the passage via the pipe connector In the oil cooler, a diameter-enlarged portion is formed on the connection pipe, and at least one part of the enlarged-diameter portion is accommodated on one end side of the pipe connector, and the enlarged-diameter portion is added to the seat. Providing a first holding part for fastening and holding the connection pipe;
A second holding part that holds the heat exchange part by expanding the diameter and crimping a part of the heat exchange part to a radiator tank is provided on the other end side of the pipe connector.

  In the first aspect of the present invention, the heat exchange part in which a passage is formed by laminating a plurality of elements in a state where the end parts of the element part are in communication with each other, and the pipe mounting hole provided in the radiator tank are passed through. In an oil cooler comprising a cylindrical pipe connector provided facing the passage through the outermost element portion of the heat exchange part in a state, and a connection pipe provided facing the passage via the pipe connector, A diameter-expanded portion is formed on the connection pipe, and the pipe connector is seated on a radiator tank in a state where at least a part of the diameter-expanded portion is accommodated at one end of the pipe connector. A second holding part for holding the heat exchanging part by expanding the diameter and crimping a part of the heat exchanging part to the radiator tank on the other end side of the pipe connector. Due to the provision of the connection pipe easily fixed at the same time can correspond to the connection pipe of various diameters, without using a separate member, it can be fixed heat exchange unit and the tank.

  Hereinafter, examples of the oil cooler of the present invention will be described.

Example 1 will be described below.
1 is an overall view showing an oil cooler according to a first embodiment of the present invention, FIG. 2 is an enlarged exploded view (partially sectional view) of a main part of the first embodiment, and FIG. 3 is an enlarged sectional view of a main part of the first embodiment. 4 is a view showing a part of the inner fin of the first embodiment, FIG. 5 is a plan view of the locking member of the first embodiment, FIG. 6 is a sectional view taken along the line S6-S6 of FIG. 5, and FIG. The top view which shows the pipe connector of the present Example 1, FIG. 8 is the same front view, FIG. 9 is sectional drawing in the S9-S9 line | wire of FIG.

  FIGS. 10 to 13 are diagrams for explaining a temporary assembly of the oil cooler along the line S10-S10 in FIG. 3, and FIG. 14 is a diagram for explaining how the oil cooler is accommodated in the radiator tank along the line S10-S10 in FIG.

First, the overall configuration will be described.
As shown in FIGS. 1 to 3, the oil cooler A of the present embodiment includes a heat exchanging portion 1, connection pipes 2 and 2, a side wall 3 of a radiator tank, and pipe connectors 4 and 4.
Since the oil cooler A of the first embodiment has a bilaterally symmetric shape, only the connection pipe 2 side is mainly illustrated and described.

The heat exchanging part 1 is constituted by alternately laminating a plurality of element parts 5 and annular sheets S1, and each element part 5 has shells 6 and 7 whose peripheral edges are formed in a substantially dish shape. 4 is formed by overlapping in the middle with the wavy inner fin 8 shown in FIG.
In addition, although the offset fin is employ | adopted for the inner fin 8 of the present Example 1, it is not this limitation.

As shown in FIG. 2, cylindrical end portions 6a projecting upward are formed at both end portions of the shell 6, while cylindrical end portions 7a projecting downward are formed at both end portions of the shell 7. ing.
Further, the opening width of the cylindrical portion 6 a of the shell 6 is formed larger than the outer diameter width of the cylindrical portion 7 a of the shell 7, so that the cylindrical portion 7 a of the shell 7 of the adjacent element portion 5 is replaced with the cylindrical portion of the shell 6. It is possible to fix by caulking in a state fitted to 6a.

  In addition, each element portion 5 protrudes in the laminating direction and has a projection portion 9 for maintaining the interval between the adjacent element portions 5, and a dimple groove 10 that suppresses deformation of the element portion 5 when the oil cooler is brazed. Are formed along the longitudinal direction of the element portion 5.

  Therefore, as shown in FIG. 3, passages R <b> 1 are formed on both sides of the heat exchanging portion 1 to bring the element portions 5 into communication with each other.

  In addition, the cylindrical portion 6a of the shell 6 in the element portion 5a at the outermost end on one side of the heat exchange portion 1 is a lower portion of the substantially cylindrical locking member 11 shown in FIGS. 2, 5, and 6 with the sheet S1 interposed therebetween. The cylindrical seating plate 12 shown in FIG. 2 is secured by a plurality of (four in this embodiment) claw portions 11b that are fixed by crimping by the cylindrical portion 11a formed on the locking member 11. The outer peripheral lower step portion 12b is fixed by caulking.

  On the other hand, a disk-shaped patch plate 13 that is crimped and fixed to the cylindrical portion 7 a of the shell 7 is attached to the element portion 5 b at the outermost end on the other side of the heat exchange portion 1.

  The connecting pipe 2 is formed with an enlarged diameter portion 2a having an enlarged diameter at a lower middle portion thereof, and the enlarged diameter portion 2a has a pipe mounting hole 3a provided in a side wall 3 (corresponding to the radiator tank) of the radiator tank. The pipe connector 4 is provided so as to face the passage R1 of the heat exchanging portion 1 in a penetrating state.

As shown in FIGS. 7 to 9, the pipe connector 4 is formed in a substantially cylindrical shape, and at one end thereof, the pipe connector 4 is seated on the side wall 3 of the radiator tank in a state in which the enlarged diameter portion 2 a is accommodated, and the diameter of the pipe connector 4 is reduced. Then, a first holding portion 4a for holding the connection pipe 2 is provided by caulking so as to wrap the outer periphery of the enlarged diameter portion 2a, and on the other end side, the diameter is increased and the inner peripheral side upper step portion 12a of the seating plate 12 is provided. Is attached to the side wall 3 of the radiator tank, and a second holding portion 4b for holding the heat exchanging portion 1 via the locking member 11 is provided.
In the first embodiment, the first holding portion 4a of the pipe connector 4 is crimped so as to wrap around the outer periphery of the enlarged diameter portion 2a of the connection pipe 2, but a part of the enlarged diameter portion 2a is attached to the pipe connector 4. A caulking structure that holds the outer periphery of the enlarged diameter portion 2a so as to be pressed by the pipe connector 4 from the side surface may be adopted.

Moreover, the 1st holding | maintenance part 4a of the present Example 1 is formed in the state divided into 8 by the eight notch grooves 4c, and, thereby, the adhesiveness with the enlarged diameter part 2a is improved.
Of course, the number of notches 4c formed is not limited to eight, and the length of the first holding portion 4a can be selected as appropriate.

  Moreover, the thickness of the 2nd holding | maintenance part 4b is considered to make the opening diameter of the pipe attachment hole 3a in the side wall 3 of a radiator tank as small as possible by forming it thinner than the 1st holding | maintenance part 4a.

  In addition, in the oil cooler A of the first embodiment, all the components including the side wall 3 of the radiator tank are made of aluminum, and the contact portion of each component is coated with a brazing material (brazing sheet) on at least one side. Yes.

  In order to temporarily assemble such an oil cooler A, first, as shown in FIG. 2, a pair of shells 6 and 7 are overlapped in an intermediate state with the inner fins 8 interposed therebetween, so that the element portion 5 The heat exchange section 1 is formed by laminating a plurality of sheets (5 layers in the first embodiment) alternately with the sheet S1.

  Next, on both sides of the heat exchanging section 1, after placing the patch plate 13 on the element section 5b at the outermost end on the other side, a punch (not shown) is press-fitted into the passage R1 of the element section 5 from the element section 5a side. By doing so, the diameter of the cylindrical portion 7a of the shell 7 in the adjacent element portions 5 is expanded and fixed to the cylindrical portion 6a of the shell 6 by caulking. At this time, the annular inner annular portion 13a provided on the inner side of the patch plate 13 is expanded in diameter by the tip of the punch and is fixed by crimping to the cylindrical portion 7a of the shell 7 of the element portion 5b.

  Next, the locking member 11 and the seating plate 12 are swaged and fixed to both sides of the element part 5a which is the outermost end of the heat exchange part 1, and these three parts are fixed.

  Next, as shown in FIGS. 10 and 11, on both sides of the heat exchanging portion 1, the pipe connector 4 is inserted into the pipe mounting hole 3a so that the first holding portion 4a is seated on the side wall 3 of the radiator tank. By extending the diameter of the second holding portion 4b of the pipe connector 4 with the heat exchanging portion 1 facing the pipe mounting hole 3a, and fixing it to the upper peripheral portion 12a on the inner peripheral side of the seating plate 12, these three To fix.

  Next, as shown in FIGS. 12 and 13, the expanded diameter portion 2 a of the connection pipe 2 is reduced in diameter in a state of being accommodated in the first holding portion 4 a of the pipe connector 4, so that the outer periphery of the expanded diameter portion 2 a is wrapped. The temporary assembly of the oil cooler A is completed by fixing both by fastening.

  At this time, the first holding portion 4a is in close contact with the enlarged-diameter portion 2a evenly by the notch groove 4c without deviation.

  Further, some gaps X1 and X2 are formed between the connection pipe 2 and the pipe connector 4, and both are fixed by caulking, so that the pipe connector 4 has various diameters (for example, 8φ to 8φ). 10φ) connection pipe 2 can be crimped and held.

  Moreover, since the connection pipe 2 is fixed using the pipe connector 4, it can respond to the connection pipe 2 of various diameters, and at the same time, the heat exchange part 1 is fixed to the side wall 3 of the radiator tank without using a separate member. it can.

  Here, in the conventional invention, there is a problem that it takes much time and effort to manage the tightening torque when screwing the connecting pipe into the pipe connector and to manage the biting of the seal member.

  In addition, since the pipe connector is a dedicated part corresponding to only one type of connection pipe, there is a problem in that it is necessary to design and manufacture each time the connection pipe has a different diameter, resulting in high costs.

  Further, in the conventional invention, since the heat exchange part and the tank are fixed by using a separate member from the pipe connector, the number of parts increases, and the pipe connector, the heat exchange part 1 and the tank are highly accurate. If it was not assembled with, there was a problem that it would lead to poor brazing or oil leakage.

  On the other hand, in the oil cooler A of the first embodiment, as described above, the first holding portion 4a of the pipe connector 4 crimps and fixes the enlarged-diameter portion 2a, while the second holding portion 4b is the seating plate 12. Since the second holding part 4b for holding the heat exchanging part 1 is provided by crimping the inner peripheral side upper step part 12a to the side wall of the tank, the first holding part 4a can correspond to the connection pipes 2 of various diameters. The connector 4 can be used as a common part.

  Further, the heat exchanging unit 1 and the tank can be satisfactorily fixed without using separate parts by the second holding unit 4b.

  Furthermore, since the first holding part 4a and the second holding part 4b are both caulked and fixed, the oil cooler A can be temporarily assembled by an easy operation.

  The oil cooler A including the side wall 3 of the radiator tank temporarily assembled as described above is brazed and fixed integrally by being heat-treated in a heating furnace (not shown).

  Next, as shown in FIG. 14, the side wall 3 of the radiator tank is fitted with the remaining U-shaped side wall 14 of the radiator tank in a state in which the oil cooler A is accommodated to form a radiator tank body 15 having a rectangular cross section. Then, it is brazed and fixed again in a state where it is temporarily assembled with the core portion and the like constituting the radiator.

  In the first embodiment, the side wall 3 of the radiator tank and the oil cooler A are heat-processed and fixed by brazing, and then the oil cooler A is accommodated in the radiator tank and heat-treated together with each component of the radiator. Although the case of brazing and fixing has been described, the first heat treatment may be omitted.

  The oil cooler A configured as described above causes the engine or AT oil to flow from the connection pipe 2 on one side into the passage R1 of the heat exchange unit 1, and then circulates in the element portions 5 in the longitudinal direction. While flowing into the passage R <b> 1 on the other side connection pipe 2 side, the cooling circuit discharges heat from the inner fin 8 and the cooling water in the radiator tank for cooling and then discharges from the other connection pipe 2.

The effects will be described below.
As described above, in the oil cooler A of the first embodiment, the heat exchanging portion 1 in which the passage R1 is formed by stacking a plurality of the end portions of the element portion 5 in communication with each other, A cylindrical pipe connector 4 provided facing the passage R1 through the outermost element portion 5a of the heat exchange section 1 in a state of passing through a pipe mounting hole 3a provided in the side wall 3 of the radiator tank; In the oil cooler A provided with the connection pipe 2 provided facing the passage R1 through 4, a diameter-expanded portion 2 a having an enlarged diameter is formed in the connection pipe 2, and at least one of the diameter-expanded portions 2 a is formed on one end side of the pipe connector 4. A first holding portion 4a for holding the connection pipe 2 by caulking the enlarged-diameter portion 2a is provided on the side wall 3 of the radiator tank in a state where a part thereof is accommodated. Shi Since the second holding portion 4b for holding the heat exchanging portion 1 is provided by crimping a part of the heat exchanging portion 1 to the side wall 3 of the radiator tank, the connecting pipe 2 can be easily fixed and the connecting pipe 2 having various diameters. At the same time, the heat exchange unit 1 and the tank can be fixed without using a separate member.

  In addition, since all the components including the radiator tank are made of aluminum and are integrally brazed and fixed in a temporarily assembled state, it is not necessary to fix the connection pipe 2 in a later process, and this type of oil cooler A Efficient productivity can be realized.

  Although the embodiments of the present invention have been described above, the specific configuration of the present invention is not limited to the embodiments, and the present invention includes any design changes that do not depart from the gist of the invention. It is.

  For example, a sheet may be interposed between the pipe connector and the connection pipe. In the case of the present embodiment, since there is no screw groove or the like in the pipe connector, there is no factor that causes the sheet to be deformed or bite as in the conventional invention, and it can be mounted properly.

1 is an overall view illustrating an oil cooler according to a first embodiment of the present invention. FIG. 2 is an enlarged exploded view (partial cross-sectional view) of a main part of the first embodiment. FIG. 3 is an enlarged cross-sectional view of a main part of the first embodiment. It is a figure which shows a part of inner fin of the present Example 1. FIG. It is a top view of the locking member of the present Example 1. It is sectional drawing in the S6-S6 line of FIG. It is a top view which shows the pipe connector of the present Example 1. It is a front view which shows the pipe connector of the present Example 1. FIG. It is sectional drawing in the S9-S9 line | wire of FIG. It is a figure explaining the temporary assembly of the oil cooler in the S10-S10 line of FIG. It is a figure explaining the temporary assembly of the oil cooler in the S10-S10 line of FIG. It is a figure explaining the temporary assembly of the oil cooler in the S10-S10 line of FIG. It is a figure explaining the temporary assembly of the oil cooler in the S10-S10 line of FIG. It is a figure explaining the accommodation in the radiator tank of the oil cooler in the S10-S10 line | wire of FIG.

Explanation of symbols

R1 passage S1 seat X1, X2
DESCRIPTION OF SYMBOLS 1 Heat exchange part 2 Connection pipe 2a Expanded diameter part 3 Radiator tank wall part 3a Pipe attachment hole 4 Pipe connector 4a First holding part 4b Second holding part 4c Notch groove 5 Element part 5a, 5b (Outermost end) element Portions 6 and 7 Shells 6a and 7a Cylindrical portion 8 Inner fin 9 Protruding portion 10 Dimple groove 11 Locking member 11a Cylindrical portion 11b Claw portion 12 Seating plate 12a Inner peripheral side upper step portion 12b Outer peripheral side lower step portion 13 Patch plate 13a Inner annular portion 14 Remaining U-shaped side wall 15 Radiator tank body

Claims (2)

A heat exchange part in which a passage is formed by laminating a plurality of elements in a state where the end parts of the element part communicate with each other;
A cylindrical pipe connector provided facing the passage through the outermost element part of the heat exchange part in a state of passing through the pipe mounting hole provided in the radiator tank,
In an oil cooler comprising a connection pipe provided facing the passage through the pipe connector,
Forming an enlarged diameter portion in the connection pipe;
One end side of the pipe connector is seated on a radiator tank in a state in which at least a part of the enlarged diameter portion is accommodated, and a first holding portion that holds the connection pipe by crimping the enlarged diameter portion is provided.
2. An oil cooler characterized in that a second holding part for holding a heat exchange part is provided on the other end side of the pipe connector by expanding the diameter and crimping a part of the heat exchange part to a radiator tank. The oil cooler according to claim 1, wherein
An oil cooler characterized in that all components including the radiator tank are made of aluminum, and are integrally brazed and fixed in a state where all of them are temporarily assembled.

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