JP2002130982A - Structure for installation of oil cooler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the workability in a tube-expanding work, while restraining increase in man-hours in installation of an oil cooler. SOLUTION: An oil tube 110 is subjected to a burring work, and the tube is partly extended out of a radiator tank 220. An annularly extended part 114 of the tube is expanded, and the oil tube 110 is caulked to the tank 220, in this state one end of a connection pipe 130 is expanded and caulked to the oil tube 110. Thus, the connection pipe 130 can be expanded without holding the tube 110 with an exclusive jig in the case of expansion of the pipe 130. Accordingly workability of the expansion can be improved, while restraining the man-hours in the installation of the oil cooler.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure for an oil cooler built in a radiator tank.
It is effective when applied to the mounting structure of an oil cooler for a vehicle.

[0002]

2. Description of the Related Art As a mounting structure of an oil cooler built in a radiator tank, for example, Japanese Unexamined Patent Publication No. Hei.
In the invention described in the above publication, a connection pipe connecting an oil cooler and an external pipe is expanded to fix the cable to an outer cylinder of the oil cooler.

[0003] The term "expansion" refers to the act of plastically deforming a pipe so as to increase the outer diameter of the pipe.

[0004]

Since the connecting pipe connects the oil cooler and the external pipe, the connecting pipe needs to be fixed to the oil cooler while passing through the inside and outside of the radiator tank.

However, in the invention described in the above-mentioned publication, the outer cylinder of the oil cooler is not fixed to the radiator tank by a mechanical connecting means such as caulking, so that when the connecting pipe is expanded, the outer cylinder is not fixed. It is necessary to perform pipe expansion work while holding the outer cylinder with a dedicated jig so that the pipe does not separate from the radiator tank, and there is a problem that workability of the pipe expansion work is poor.

[0006] To solve this problem, if the pipe expansion operation is performed after brazing the outer cylinder to the radiator tank, it is not necessary to hold the outer cylinder with a special jig when performing the pipe expansion work on the connection pipe. In this method, apart from the brazing step for joining the outer cylinder to the radiator tank, a brazing step for closing a minute gap generated in a fixing portion between the connection pipe and the outer cylinder occurs, so that the oil cooler A new problem arises in that the number of steps (time) required for mounting the device increases.

SUMMARY OF THE INVENTION In view of the foregoing, it is an object of the present invention to improve the workability of a pipe expanding operation while suppressing an increase in man-hours (time) when installing an oil cooler.

[0008]

According to the present invention, in order to achieve the above object, according to the first aspect of the present invention, a part of an oil tube (110) constituting a passage through which oil flows is formed by a radiator tank (110). 220) The oil tube (110) is extended to the outside and brazed in a state where the oil tube (110) is fixed to the radiator tank (220) by caulking so as to expand the annular extension (114). Furthermore, one end of a metal connection pipe (130) connecting the oil tube (110) and the external pipe is brazed while being inserted into the oil tube (110).

Accordingly, the oil tube (110) has a structure fixed by caulking to the radiator tank (220). Therefore, when the connection pipe (130) is expanded, the oil cooler (oil tube (110)) is subjected to a dedicated treatment. The connection pipe (130) can be expanded without holding it with a tool.

Therefore, it is possible to improve the workability of the pipe expanding operation while suppressing an increase in the number of steps (time) when installing the oil cooler.

According to a second aspect of the present invention, one end of the connection pipe (130) is connected to an oil tube (11).
It is desirable to expand the tube while inserting it into 0).

According to the third aspect of the present invention, the extension portion (11
4) has an outer diameter dimension (D1) on the side of the root portion (114a) of the inner wall (22) of the radiator tank (220).
It is characterized in that it is formed to be larger than the outer dimension (D2) on the 0a) side.

As a result, the root (114a) of the extension (114) is connected to the inner wall (2) of the radiator tank (220).
20a), it is possible to prevent a predetermined gap between the inner wall (220a) of the radiator tank (220) and the oil cooler (oil tube (110)).

Therefore, the radiator tank (220)
The cooling water can reliably flow between the inner wall (220a) and the oil cooler (oil tube (110)), so that the heat transfer area between the oil cooler and the cooling water can be prevented from decreasing. .

According to the fourth aspect of the present invention, the extension portion (11)
4) has an outer diameter dimension (D1) on the side of the root portion (114a) of the inner wall (22) of the radiator tank (220).
It is characterized by being formed in a stepped shape so as to be larger than the outer dimension (D2) on the 0a) side.

Thus, a predetermined gap can be secured between the inner wall (220a) of the radiator tank (220) and the oil cooler (oil tube (110)), similarly to the third aspect of the invention. .

According to a fifth aspect of the present invention, the extension portion (114) is formed by the brazing material coated on the outer surface of the radiator tank (220).
The connecting pipe (130) is brazed to the connecting portion (11) by the brazing material coated on the inner surface of the extending portion (114).
It is desirable to be brazed in 4).

According to the sixth aspect of the present invention, a part of the oil tube (110) constituting the passage through which the oil flows is extended to the outside of the radiator tank (220), and the extended annular extension portion is provided. A first caulking step of caulking and fixing the oil tube (110) to the radiator tank (220) by expanding the oil tube (114);
10) and a metal connection pipe (13)
A second caulking step of caulking and fixing the connection pipe (130) to the oil tube (110) by expanding the pipe while inserting one end of the oil pipe (0) into the oil tube (110), and an outer surface of the radiator tank (220). The extension (114) is formed by the brazing material coated on the radiator tank (220).
And a brazing step of brazing the connecting pipe (130) to the extension (114) with a brazing material coated on the inner surface of the extension (114).

Thus, the oil tube (110) has a structure fixed by caulking to the radiator tank (220). Therefore, when the connecting pipe (130) is expanded, the oil cooler (oil tube (110)) is subjected to a dedicated treatment. The connection pipe (130) can be expanded without holding it with a tool.

Therefore, it is possible to improve the workability of the pipe expanding operation while suppressing an increase in the number of steps (time) when installing the oil cooler.

Incidentally, the reference numerals in parentheses of the above means are examples showing the correspondence with specific means described in the embodiments described later.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment)
An example in which the oil cooler mounting structure according to the present invention is applied to an oil cooler mounting structure for cooling oil such as engine oil for lubricating a sliding portion in an engine (not shown) or fluid for automatic transmission (ATF). FIG. 1 shows an oil cooler 100 according to the present embodiment.
FIG. 2 is a perspective view showing a state in which radiator 200 is stored in radiator 200.
Abbreviated as cooling water. ), And an aluminum radiator tank (hereinafter abbreviated as a tank) 220 disposed at both ends in the longitudinal direction of the radiator tube 210 and communicating with the plurality of radiator tubes 210. The oil cooler 100 is housed in the tank 220 in a state where the longitudinal direction of the oil cooler 100 matches the longitudinal direction of the tank 220.

FIG. 2 is a view showing the oil cooler 100 before being assembled to the tank 220, and FIG. 3 is a sectional view of the oil cooler 100 shown in FIG. The oil cooler 100 cools the oil by arranging a flat oil tube 110 through which the oil flows in the tank 220 as shown in FIG. 3 to exchange heat between the oil and the cooling water. It is.

Reference numeral 120 denotes oil and the oil tube 1
10 is an inner fin that increases the heat transfer area between the oil tube 10 and the oil and the oil tube 110, and in the present embodiment, the plate-like segment 121 that is substantially parallel to the minor diameter direction is an oil fin. Offset fins provided in a staggered manner in the longitudinal direction of the tube 120 are employed.

Here, the oil tube 110 is brazed to aluminum first and second plates 111 and 112 which have been pressed into a predetermined shape in a state where the inner fins 120 are disposed between the two plates 111 and 112. It is constituted by the above.

The second plate 112 is provided with an annular burring portion 112a formed by burring and extending toward the first plate 111, and the first plate 111 is provided with an annular burring portion 112a. A concave portion 111a which is depressed to the side and has a through hole formed in the bottom thereof is provided by press working.

Then, as shown in FIG. 4, after the burring portion 112a is made to pass through a through hole formed at the bottom of the concave portion 111a, a part of the burring portion 112a is radiated outside the through hole. Plastically deformed so as to spread toward the surface, and fixed by caulking. Then, the inner plates of the first and second plates 111 and 112 are covered with a brazing material clad (coated) with the inner fins 1 and 112.
20 were joined by brazing.

In this embodiment, since the oil cooler 100 is constituted by the two oil tubes 110, both ends in the longitudinal direction are part of the oil tube 110 as shown in FIG. To the adjacent oil tube 110 side, and the raised ridge 113
Are brought into contact with each other, and a gap δ1 for flowing cooling water between adjacent oil tubes 110 is secured.

Incidentally, a through-hole into which the burring portion 113a formed on the other-side raised portion 113 is inserted is formed in the raised portion 113 on one side of the adjacent oil tube 110, and the first and second plates are formed. Similarly to 111 and 112, after a part of the burring portion 113a is plastically deformed so as to expand toward the outside of the through hole and caulked and fixed, the two tubes 110 (the raised portions 113) are brazed.

As shown in FIG. 3B, a portion of the oil cooler 100 (oil tube 110) corresponding to the raised portion 113 has a tank 220
An annular extension (burring portion) 11 extending toward the side
4 are formed integrally by burring, and the extending portion 114 extends through the through hole 221 formed in the tank 220 to the outside of the tank 220 as shown in FIG. It is plastically deformed so as to expand (expand) and is caulked.

At this time, the extending portion 114 is
The outer diameter dimension D1 on the 14a side is larger than the outer dimension D2 on the inner wall 220a side of the tank 220 so as to have a stepped portion 114b so as to have a stepped shape.

Reference numeral 130 denotes an aluminum connection pipe for connecting the oil cooler 100 (oil tube 110) and an external pipe (not shown).
One end of the tube 30 is expanded and caulked while being inserted into the oil tube 110.

Next, a method of mounting the oil cooler 100 will be described in the order of the steps.

The oil tube 11 to which the first and second plates 111 and 112 and the inner fin 120 are brazed.
0 (in the state shown in FIGS. 2 and 3) is inserted into the through-hole 221 and expanded so as to expand the end of the oil cooler 100 (oil tube 110).
Is fixed to the tank 220 by caulking (first caulking process).

Next, one end of the connection pipe 130 is inserted into the oil tube 110, and
The connection pipe 130 is caulked and fixed to the oil tube 110 by expanding the end of the 30 on the oil tube 110 side (second caulking step).

Then, the extension 114 is brazed to the tank 220 with the brazing material coated on the outer surface of the tank 220, and the connecting pipe is brazed with the brazing material coated on the inner surface of the extension 114 (first plate 111). 130 is brazed to the extension 114 (brazing step).

In this brazing step, the radiator 2 such as the radiator tube 210 and the tank 220 is used.
The parts making up 00 are also brazed at the same time.

Next, the features of this embodiment will be described.

According to this embodiment, the extending portion 114 is formed in the tank 220, penetrates the through hole 221, and
The oil cooler 100 (the oil tube 110) is fixed to the tank 220 by swaging.

Therefore, when expanding the connection pipe 130, the connection pipe 130 can be expanded without holding the oil cooler 100 (oil tube 110) with a dedicated jig. The workability of the pipe expansion work can be improved while suppressing an increase in the number of man-hours (time).

The extending portion 114 has a base portion 114.
The outer diameter dimension D1 on the a side is the inner wall 22 of the tank 220.
Since it is formed so as to be larger than the outer dimension D2 on the 0a side, it is possible to prevent the root portion 114a of the extension portion 114 from contacting the inner wall 220a of the tank 220.

Accordingly, the inner wall 220a of the tank 220
A predetermined gap δ2 can be ensured between the oil cooler 100 (oil tube 110) and the oil cooler 100 (oil tube 110), so that the cooling water is reliably circulated between the inner wall 220a of the tank 220 and the oil cooler 100 (oil tube 110). Thus, it is possible to prevent the heat transfer area between the oil cooler 100 and the cooling water from being reduced.

(Second Embodiment) In the first embodiment, the oil cooler 100 is constituted by a plurality of oil tubes 110 formed in a flat shape. However, in this embodiment, as shown in FIG. Inner tube (inner tube) 115 and outer tube (outer tube) 1 arranged coaxially with inner tube 115
And a double-cylinder oil cooler 10 comprising
0 is adopted. In the present embodiment, the oil flows through the space between the outer cylinder 116 and the inner cylinder 15, and the outer cylinder 116 has the extension 114.

(Other Embodiments) In the above embodiment, the extension portion 114 was caulked while the first and second plates 111 and 112 and the inner fin 120 were brazed. However, the present invention is not limited to this. Instead, the first and second plates 111 and 112 and the inner fin 120 may be brazed together with the connection pipe 130, the radiator tube 210, the tank 220, and the like during the brazing step.

In the above-described embodiment, brazing is performed by using a brazing material clad on the surface of the aluminum material (the brazing material is pressed against the aluminum material by high pressure).
The present invention is not limited to this, and may be brazed with a brazing material coated by, for example, coating or spraying.

In the above embodiment, the connection pipe 1
One end of the connection pipe 130 is inserted into the oil tube 110 and expanded to fix one end of the connection pipe 130 to the oil tube 110. However, the present invention is not limited to this. By press-fitting the side into the oil tube 110, the connection pipe 130
May be temporarily fixed to the oil tube 110.

[Brief description of the drawings]

FIG. 1 is a perspective view of a radiator employing an oil cooler mounting structure according to an embodiment of the present invention.

FIG. 2 is a two-view drawing of the oil cooler according to the first embodiment of the present invention.

FIG. 3A is a sectional view taken along line AA of FIG. 2A;
FIG. 2B is a sectional view taken along line BB of FIG.

FIG. 4 is an enlarged view of a burring portion of FIG.

FIG. 5 is a sectional view showing an oil cooler mounting structure according to the first embodiment of the present invention.

FIG. 6 is a cross-sectional view illustrating an oil cooler mounting structure according to a second embodiment of the present invention.

[Explanation of symbols]

100: oil cooler, 110: oil tube, 11
4 ... extension part, 130 ... connecting pipe.

Claims (6)

[Claims] An oil cooler mounted in a metal radiator tank (220) for exchanging heat between cooling water and oil in the radiator tank (220). Constituent oil tube (11
0) is extended outside the radiator tank (220), and the extended annular extension (11) is extended.
4) Expand the oil tube (110)
Is fixed to the radiator tank (220) by brazing, and one end of a metal connection pipe (130) connecting the oil tube (110) and an external pipe is connected to the oil tube (130). 110) An oil cooler mounting structure characterized in that it is brazed while being inserted to the inside. 2. One end of the connection pipe (130)
The oil cooler mounting structure according to claim 1, wherein the pipe is expanded while being inserted into the oil tube (110). 3. An outer diameter dimension (D1) of the extension part (114) at a root part (114a) side is larger than an outer diameter dimension (D2) at an inner wall (220a) side of the radiator tank (220). The mounting structure for an oil cooler according to claim 1, wherein the mounting structure is formed as follows. 4. The extension (114) has an outer diameter dimension (D1) on the root (114a) side larger than an outer dimension (D2) on the inner wall (220a) side of the radiator tank (220). The oil cooler mounting structure according to claim 1 or 2, wherein the mounting structure is formed in a stepped shape. 5. The extension (114) is brazed to the radiator tank (220) by a brazing material coated on an outer surface of the radiator tank (220), and is attached to an inner surface of the extension (114). The connection pipe (130) is brazed to the extension (114) by a coated brazing material.
The oil cooler mounting structure according to any one of the above. 6. An oil cooler mounted in a metal radiator tank (220) for exchanging heat between cooling water and oil in the radiator tank (220), the method comprising: Constituent oil tube (11
0) is extended to the outside of the radiator tank (220), and the oil tube (110) is connected to the radiator tank (220) so as to expand the annular extension (114). A first caulking step of caulking and fixing; expanding the pipe while inserting one end side of a metal connection pipe (130) connecting the oil tube (110) and an external pipe into the oil tube (110); A second caulking step of caulking and fixing the connection pipe (130) to the oil tube (110); and the extending portion (114) being formed of a brazing material coated on the outer surface of the radiator tank (220). ) And brazing the inner surface of the extension (114) with the connecting pipe (130) to the extension (114). Mounting of the oil cooler, characterized by having a brazing step of brazing the 14).