JP3183523B2 - Pipe tank for aluminum heat exchanger with built-in oil cooler and method of manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe tank of an aluminum heat exchanger having a built-in oil cooler and a method of manufacturing the pipe tank.

[0002]

2. Description of the Related Art Conventionally, as a heat exchanger made of aluminum with a built-in oil cooler, as disclosed in Japanese Utility Model Application Laid-Open No. 2-72326, for example, a radiator tank is formed of aluminum and is provided in the radiator tank. One equipped with an oil cooler made of aluminum,
As disclosed in Japanese Patent Application Laid-Open No. 0821, there is known a radiator tank formed of a resin material and an oil cooler mounted in the radiator tank.

FIG. 6 shows a mounting structure of a double-tube oil cooler in an aluminum radiator in which a radiator tank is formed of a resin material. After baking the cooler 1 in another step and brazing the inner pipe 4, the outer pipe 5, the connector 7, the oil cooler pipe 9, and the like, the oil cooler pipe 9 is inserted into the pipe insertion hole 11 of the resin tank 3 while the oil is cooled. The cooler 1 is interposed in the resin tank 3, and a washer 13 and a nut 15 are screwed to the oil cooler pipe 9 via an O-ring to fix the oil cooler 1 to the resin tank 3. After the attachment of the oil cooler 1 is completed, the oil cooler 1 is built in the radiator 19 by caulking and fixing the resin tank 3 to the radiator core 17.

[0004]

Recently, however, there has been proposed an aluminum radiator in which a cylindrical pipe made of aluminum is used for a radiator tank and the pipe tank is brazed integrally with a radiator core. ing. However, in such a pipe tank, the oil cooler cannot be attached by the method as shown in FIG. 6, and there is no other way but to insert the oil cooler from one of the openings at both ends and attach the oil cooler to the pipe tank.

When the oil cooler is inserted into the pipe tank when the oil cooler pipe is inserted into the oil cooler body including the inner pipe and the outer pipe, the oil cooler is inserted into the pipe tank. In addition, even if the oil cooler pipe is to be inserted later, an O-ring is required for the seat, and it is impossible to braze both ends of the pipe tank together because of the O-ring. There has been a demand for a structure of a pipe tank incorporating an oil cooler and a method of manufacturing the same.

The present invention has been devised in view of such circumstances, and a pipe tank of a simple aluminum heat exchanger having a built-in oil cooler and such a pipe tank can be easily prepared without using a jig. An object of the present invention is to provide a method for manufacturing a pipe tank that can be manufactured.

[0007]

In order to achieve the above object, a pipe tank of an aluminum heat exchanger including an oil cooler according to the present invention is provided with a plurality of tube insertion holes for inserting tubes of a heat exchanger core. And an aluminum cylindrical pipe provided with an oil cooler pipe insertion hole through which the oil cooler pipe is inserted, and an aluminum double-tube oil cooler mounted in the cylindrical pipe and comprising an inner pipe and an outer pipe The main body and an oil passage attached to both ends of the oil cooler main body, the oil cooler pipe mounting hole and an oil passage communicating with the oil cooler pipe mounting hole and leading oil between the inner pipe and the outer pipe of the oil cooler main body. The connector is provided with two aluminum pipes which are inserted through the pipe insertion holes of the tubular pipe and are inserted into the oil cooler pipe mounting holes of the connector. Oil cooler pipe, and an aluminum cap for closing both ends of the cylindrical pipe, the connector has a projection formed on the back side of the surface on which the oil cooler pipe mounting hole is formed, It is characterized in that it is formed to have the same size as the inner diameter of the tubular pipe.

[0008] Further, the method for manufacturing a pipe tank of the present invention comprises:
An aluminum cylindrical pipe provided with a plurality of tube insertion holes for inserting tubes of the heat exchanger core and an oil cooler pipe insertion hole for inserting an oil cooler pipe,
An aluminum double-tube oil cooler main body, which is mounted in the cylindrical pipe and includes an inner pipe and an outer pipe, and is attached to both ends of the oil cooler main body, and is provided with an oil cooler pipe mounting hole and the oil cooler pipe mounting. A connector provided with an oil passage communicating with the hole to introduce oil between the inner pipe and the outer pipe of the oil cooler main body, and an oil cooler pipe mounting of the connector through the pipe insertion hole of the cylindrical pipe. The connector includes two aluminum oil cooler pipes inserted into the holes, and an aluminum cap for closing both ends of the cylindrical pipe. The connector has a surface on which an oil cooler pipe mounting hole is formed. A protrusion of the aluminum heat exchanger having a built-in oil cooler having a projection formed on the back side of the cylinder and having the same size as the inner diameter of the cylindrical pipe. At the time of manufacturing the tank, the connector formed with the same size as the inner diameter of the tubular pipe is attached to both ends of the oil cooler body including the inner pipe and the outer pipe, and the oil cooler body is expanded by expanding the inner pipe. After temporarily assembling them and inserting them into the cylindrical pipe, two oil cooler pipes are inserted into the oil cooler pipe insertion holes of the cylindrical pipe, and the insertion-side ends of the oil cooler pipes are connected to the oil cooler pipe of the connector. It is inserted into the mounting hole, and both ends of the cylindrical pipe are closed with aluminum caps, and these are integrally brazed in the furnace.

[0009]

According to the pipe tank of the present invention, the connector provided with the projection reliably positions and supports the oil cooler body in the tubular pipe. If this is used, for example, as a radiator tank for a radiator for a vehicle, the cooling water cooled by the radiator core flows down into the pipe tank and is returned to the engine from the outlet pipe. The oil that has flowed into the oil cooler body from the oil cooler pipe is cooled by the cooling water in the pipe tank while flowing between the inner pipe and the outer pipe as in the conventional case, and is then transferred from the oil cooler pipe to the torque converter side. Will be leaked to

According to the method for manufacturing a pipe tank according to the present invention, connectors formed to have the same dimensions as the inner diameter of the cylindrical pipe are attached to both ends of the oil cooler body including the inner pipe and the outer pipe. After expanding the inner pipe and temporarily assembling the oil cooler main body, inserting these into the tubular pipe, inserting two oil cooler pipes into the oil cooler pipe insertion holes of the tubular pipe, and A pipe tank incorporating an oil cooler by inserting the insertion end into the oil cooler pipe mounting hole of the connector, closing both ends of the tubular pipe with aluminum caps and brazing them together in a furnace. Will be manufactured.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 4 show an embodiment of a pipe tank according to the present invention. In the figures, reference numeral 21 denotes a circular cylindrical pipe made of aluminum, and the cylindrical pipe (hereinafter referred to as “pipe”) 21. 2 are provided with two oil cooler pipe insertion holes 27 and 29 through which two right and left oil cooler pipes 23 and 25 are inserted. As shown in FIG. A plurality of tube insertion holes 33 for inserting the tube 31 of the octopus are provided in a row, and the openings at both ends thereof are closed with aluminum caps 35. Also, pipe 2
An outlet pipe mounting hole 37 is burred at one end side of the oil cooler pipe insertion holes 27 and 29 on one end side, and an aluminum outlet pipe 39 is inserted into the outlet pipe mounting hole 37. I have. A double-tube oil cooler 41 is mounted in the pipe 21 as shown in FIGS.

The oil cooler 41 has an oil cooler body 49 having a double pipe structure comprising an inner pipe 43 and an outer pipe 45 formed of straight pipes, and an inner fin 47 interposed therebetween. It is composed of aluminum oil cooler pipes 23, 25 attached to both ends via forged connectors 51, 53. As shown in FIGS. 2 and 4, the connector 51 into which the one oil cooler pipe 23 is inserted has a cross-sectional shape in which a projecting portion 57 in which the mounting hole 55 of the oil cooler pipe 23 is formed is provided on the outer periphery. It has a connector main body 59 having a shape, and a flat plate projection 61 provided to extend on the opposite side to the protruding portion 57, and the total length L is set to a size corresponding to the inner diameter of the pipe 21. .

A through hole 63 through which the inner tube 43 passes is formed in the connector body 59 in the axial direction of the pipe 21, and is larger than the outer diameter of the inner tube 43 and larger than the inner diameter of the outer tube 45. Circular recess 65 having a small diameter
Are formed inside the connector main body 59 with the same central axis as the through hole 63, and the mounting hole 55 and the concave portion 65 are connected to each other via an oil passage 67.

Further, as shown in FIG. 4, an annular projection 69 having the same outer diameter as the inner diameter of the outer tube 45 is formed integrally with the opening edge of the concave portion 65. The end 45a of the 45 is engaged. The oil flowing from the oil cooler pipe 23 attached to the mounting hole 55 is introduced between the inner pipe 43 and the outer pipe 45 via the oil passage 67 and the recess 65.

As shown in FIG. 1, the other connector 5
3 is formed in a shape symmetrical to the connector 51, and the inner tube 43 and the outer tube 45 are similarly attached to the connector 53. And the oil cooler pipe 23
The oil introduced between the inner pipe 43 and the outer pipe 45 from
The oil flows out of the oil cooler pipe 25 through the concave portion 71 of the connector 53 and the oil passage 73.
The two connectors 51, which contact the inner circumference of the pipe 21,
The end of the pipe 53 is formed in an arc shape along the inner peripheral surface of the pipe 21 so that the connectors 51 and 53 can be easily pressed into the pipe 21.

In FIG. 1, reference numeral 75 denotes a flat plate projection formed on the connector 53, and reference numeral 77 denotes a mounting hole for the oil cooler pipe 25. The pipe tank 79 configured as described above is manufactured as follows according to an embodiment of the method of the present invention. First, after penetrating the inner tube 43 clad with the brazing material R on the outside through the through hole 63 of the one connector 51, the end portion 45 of the outer tube 45 clad with the brazing material R on the inside.
a is engaged with the annular projection 69 of the connector 51 to close the end 45a of the outer tube 45. An inner fin 47 is interposed between the inner tube 43 and the outer tube 45, and the inner tube 43 and the outer tube 4 are interposed.
A connector 53 is attached to the other end of the connector 5, and the oil cooler body 49 and the connectors 51 and 53 are temporarily fixed via the inner pipe 43. At this time, it is necessary that the mounting holes 55 and 77 of both connectors 51 and 53 be located in the same direction.

Then, as shown in FIG. 5, an oil cooler body 49 having connectors 51 and 53 attached to both ends is inserted from one end of the pipe 21 in which the brazing material R is clad on the outer surface. At this time, since the connectors 51 and 53 have dimensions matching the inner diameter of the pipe 21, press-fitting them as shown in FIG. 2 ensures the positioning of the oil cooler body 49. Thereafter, the mounting holes 55,77 of the connector 51 and 53 is matched to the oil cooler pipe insertion holes 27 and 29, the oil cooler pipes 23 and 25 that clad brazing material R to the outer surface the Oiruku
Are inserted into the mounting holes 55 and 77 from the roller pipe insertion holes 27 and 29 . By inserting the oil cooler pipes 23 and 25 into the mounting holes 55 and 77 in this manner, the oil cooler 41 is
Is temporarily attached to the pipe 21. The openings at both ends of the pipe 21 are closed with caps 35 clad with the brazing material R, and outlet pipes 39 clad with the brazing material R are inserted into outlet pipe mounting holes 37. Radiator temporarily assembled into
By inserting the taco tubes 31 and baking them in a furnace and brazing them together, an aluminum radiator having a pipe tank 79 with an oil cooler 41 built therein is produced.

Thus, the pipe tank 79 according to this embodiment
Is configured in this manner, the flat plate projections 61, 75
Is provided, the oil cooler main body 49 is reliably positioned and supported in the pipe 21. If this is used, for example, as a radiator tank of a radiator for a vehicle, the cooling water cooled by the radiator core flows down into the pipe tank 79 and is returned from the outlet pipe 39 to the engine. And, from the oil cooler pipe 23, the oil cooler body 49
The oil flowing into the inner pipe 43 and the outer pipe 4
5 and is cooled by the cooling water in the pipe tank 79 while flowing down, and flows out from the oil cooler pipe 25 to the torque converter side.

Therefore, according to the present embodiment, when the aluminum pipe 21 is adopted as the radiator tank and used as the pipe tank 79, the pipe tank 7 is used.
Since the oil cooler 41 can be built in the cylinder 9 with a simple structure, the way to actively use the pipe tank 79 as a radiator tank is opened. or,
In the method for manufacturing the pipe tank 79 according to the present embodiment,
As described above, after inserting the oil cooler main body 49 with the connectors 51 and 53 attached to both ends into the pipe 21,
The mounting holes 55 and 77 of the connectors 51 and 53 are matched with the oil cooler pipe insertion holes 27 and 29, and the oil cooler pipes 23 and 25 are connected to the oil cooler pipe insertion holes 27 and 2 respectively.
9 to the mounting holes 55 and 77, the openings at both ends of the pipe 21 are closed with caps 35, and these are baked to produce a pipe tank 79 having the oil cooler 41 built therein. Can be easily manufactured.

According to this embodiment, the connector 5
Since the oil cooler body 49 and the oil cooler pipe 23 are connected to the connectors 51 and 53, the oil cooler main body 49 and the oil cooler pipe 23 are connected to the connectors 51 and 53, respectively. ,
When the oil cooler pipes 23 and 25 are inserted, the flat plate projections 61 and 75 receive the force when the oil cooler pipes 23 and 25 are inserted, so that the oil cooler pipes 23 and 25 can be securely attached.

In addition, according to the present embodiment, the oil cooler 41 can be temporarily attached to the pipe 21 without the need for a jig, so that workability is good, and a mounting nut or the like is unnecessary as in the prior art. Further, there is an advantage that the oil cooler 41 can be integrally brazed to the pipe 21 simultaneously with the radiator core without brazing alone. Incidentally, the embodiment of the above manufacturing method is the same as that of the oil cooler 41 at the same time as the radiator core.
However, the oil cooler 41 and the pipe 21 may be brazed separately from the radiator core. Further, in each of the above embodiments, a circular cylindrical pipe is used as the pipe 21, but the pipe 21 is not limited to a circular shape.

Further, in the above embodiment, the brazing material R is clad on the outside of the inner tube 43 and the inside of the outer tube 45 and brazed together. 4
It is also possible to interpose them inside the furnace 5 and braze them together in the furnace.

[0023]

As described above, according to the pipe tank of the aluminum heat exchanger incorporating the oil cooler according to the present invention, an aluminum pipe is adopted as the tank of the heat exchanger and the pipe tank is used. In the case of using the oil tank, the oil cooler can be built in the pipe tank with a simple structure, so that the way to actively use the pipe tank as a tank of the heat exchanger is opened.

According to the method for manufacturing a pipe tank according to the present invention, the pipe tank can be easily manufactured, and the connector is formed to have the same size as the inner diameter of the pipe. By press-fitting the oil cooler into the pipe, the oil cooler body can be positioned reliably, and when inserting the oil cooler pipe into the connector,
Since the flat plate projection receives the force when the oil cooler pipe is inserted, the oil cooler pipe can be securely mounted.

In addition, according to the manufacturing method of the present invention, the oil cooler can be temporarily attached to the pipe without the need for a jig, so that workability is good, and a mounting nut or the like is unnecessary as in the conventional case. And there is an advantage that the oil cooler can be integrally brazed to the pipe tank without brazing alone.

[Brief description of the drawings]

FIG. 1 is a sectional view of a pipe tank according to one embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a sectional view taken along line III-III in FIG. 1;

FIG. 4 is an enlarged sectional view of the connector.

FIG. 5 is a perspective view illustrating a method for manufacturing a pipe tank.

FIG. 6 is a perspective view showing a conventional method of attaching an oil cooler to a resin tank.

[Explanation of symbols]

 21 Pipe 23, 25 Oil cooler pipe 31 Tube 33 Tube insertion hole 35 Cap 41 Oil cooler 43 Inner tube 45 Outer tube 49 Oil cooler body 51, 53 Connector 55, 77 Mounting hole 61, 75 Flat protrusion 67, 73 Oil passage 79 Pipe tank

Continued on the front page (72) Inventor Kuniaki Oki 5-24-15 Minamidai, Nakano-ku, Tokyo Cal Sonic Corporation (72) Inventor Takashi Beppu 5-24-15 Minamidai, Nakano-ku, Tokyo Cal Sonic Corporation (56) References JP-A-57-90594 (JP, A) JP-A-59-81496 (JP, A) JP-A-59-71071 (JP, U) JP-A-58-122735 (JP, U) No. 61-26777 (JP, Y2) (58) Fields investigated (Int. Cl. ⁷ , DB name) F28F 9/00-9/26

Claims (2)

(57) [Claims] A plurality of tube insertion holes (33) for inserting tubes (31) of a heat exchanger core and oil cooler pipe insertion holes (27, 29) for inserting oil cooler pipes (23, 25) are provided. Aluminum tubular oil cooler body (49), which is made up of an aluminum tubular pipe (21) and an inner pipe (43) and an outer pipe (45) mounted in the tubular pipe (21). ) Is attached to both ends of the oil cooler body (49), and communicates with the oil cooler pipe mounting holes (55, 77) and the oil cooler pipe mounting holes (55, 77) to transfer oil to the oil cooler body (49). Connectors (51, 53) provided with oil passages (67, 73) to be drawn in and out between an inner pipe (43) and an outer pipe (45); and a pipe insertion hole (20) for the tubular pipe (21). 27, 29) through the connector (5
1, 53) Oil cooler pipe mounting holes (55, 77)
The connector (51) comprises two aluminum oil cooler pipes (23, 25) inserted into the connector (25, 25), and an aluminum cap (35) for closing both ends of the cylindrical pipe (21). , 53) are formed with projections (61, 75) on the back side of the surface on which the oil cooler pipe mounting holes (55, 77) are formed, so that the tubular pipe (2, 53) is formed.
A pipe tank (79) of an aluminum heat exchanger incorporating an oil cooler (41), which is formed to have the same size as the inner diameter of (1). 2. A plurality of tube insertion holes (33) for inserting tubes (31) of a heat exchanger core and oil cooler pipe insertion holes (27, 29) for inserting oil cooler pipes (23, 25). Aluminum tubular oil cooler body (49), which is made up of an aluminum tubular pipe (21) and an inner pipe (43) and an outer pipe (45) mounted in the tubular pipe (21). ) Is attached to both ends of the oil cooler body (49), and communicates with the oil cooler pipe mounting holes (55, 77) and the oil cooler pipe mounting holes (55, 77) to transfer oil to the oil cooler body (49). Connectors (51, 53) provided with oil passages (67, 73) to be drawn in and out between an inner pipe (43) and an outer pipe (45); and a pipe insertion hole (20) for the tubular pipe (21). 27, 29) through the connector (5
1, 53) Oil cooler pipe mounting holes (55, 77)
The connector (51) comprises two aluminum oil cooler pipes (23, 25) inserted into the connector (25, 25), and an aluminum cap (35) for closing both ends of the cylindrical pipe (21). , 53) are formed with projections (61, 75) on the back side of the surface on which the oil cooler pipe mounting holes (55, 77) are formed, so that the tubular pipe (2, 53) is formed.
When manufacturing a pipe tank (79) of an aluminum heat exchanger containing an oil cooler (41) formed to the same size as the inner diameter of 1), the pipe is composed of an inner pipe (43) and an outer pipe (45). The connectors (51, 53) having the same dimensions as the inner diameter of the tubular pipe (21) are attached to both ends of the oil cooler body (49), and the inner pipe (4) is mounted.
3) is expanded to temporarily assemble the oil cooler body (49), and after inserting these into the tubular pipe (21), two oil cooler pipes (23, 25) are connected to the tubular pipe (23). 21) Oil cooler pipe insertion hole (27,
29), and the end on the insertion side is connected to the connector (5).
1, 53) Oil cooler pipe mounting holes (55, 77)
A method for producing a pipe tank (79), characterized in that both ends of a cylindrical pipe (21) are closed with aluminum caps (35) and these are integrally brazed in a furnace.