JP2002195783A - Oil cooler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the manufacturing cost of an oil cooler. SOLUTION: A tube 110 is constituted of first and second plates 111 and 112, coated with a brazing material on the inner wall side, and the first and second plates 111 and 112 are brazed, while being caulked (temporary fixed) at a caulking part 111d and at a burring part. Since a jig for holding an assembling state is not required at the brazing process, investment in the facility and manufacturing labor can be reduced, resulting in cost reduction in the manufacture of an oil cooler 100.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an oil cooler built in a radiator tank, and is effective when applied to an oil cooler for a vehicle.

[0002]

2. Description of the Related Art For example, in an oil cooler described in JP-A-63-36885, a flat tube through which oil flows is formed by brazing two plates press-formed in a predetermined shape. The tubes are arranged so as to be substantially parallel to each other with a predetermined gap through which the cooling water flows between the tubes.

[0003]

By the way, when brazing the plates constituting the tube, after assembling the plates so as to be laminated, until the brazing is completed (at the time of the brazing process), It is necessary to hold (maintain) the assembled state by using a tool such as a wire.

However, this means requires a jig and a tool for maintaining the assembled state, and requires a step of mounting the jig before the brazing process. Since the removal step occurs, capital investment and manufacturing man-hours increase, and it is difficult to reduce the manufacturing cost of the oil cooler.

[0005] In view of the above, an object of the present invention is to reduce the production cost of an oil cooler.

[0006]

According to the present invention, in order to achieve the above object, according to the first aspect of the present invention, an oil which exchanges heat with cooling water in a radiator tank (220) flows and a predetermined amount of oil flows. First and second tubes (110a, 110a, 110a, 110a) extending substantially parallel to each other with a gap between them.
b) an oil cooler comprising:
0a, 110b) are tubes (110a, 110b)
The first plate is formed by brazing two plate members (111, 112) each having a surface corresponding to the inner wall surface covered with a brazing material in a state in which a part thereof is plastically deformed and fixed by caulking. Of the two plate members (111, 112) constituting the tube (110a), a plate member (112) located on the second tube (110b) side and a second tube (110)
The plate material (111) located on the first tube (110a) side of the two plate materials (111, 112) constituting b) means that at least one of the plate materials (111) is plastically deformed. Characterized by being fixed by swaging.

[0007] This eliminates the need for jigs and tools that maintain the assembled state during the brazing process, thereby reducing capital investment and manufacturing man-hours, and reducing the manufacturing cost of the oil cooler 100.

According to the second aspect of the present invention, two plate members (111, 112) constituting the first tube (110a) are provided.
Of the plate material (1) located on the second tube (110b) side
12) and the first tube (110) of the two plates (111, 112) constituting the second tube (110b).
The plate material (111) located on the a) side corresponds to both tubes (1).
Communication part (110c) for communicating between 10a and 110b)
Wherein at least one of the plate members (111) is plastically deformed and fixed by caulking.

Thus, the first and second tubes (110a, 110b) are not brought into contact with each other unnecessarily,
Since the two plates (111, 112) can be fixed by caulking, the gap between the tubes (110a, 110b) is not reduced, and the tubes (110a, 110b) are not reduced.
, The first and second plates (111, 112) can be fixed by caulking.

According to the third aspect of the present invention, the oil for heat exchange with the cooling water in the radiator tank (220) circulates, and the first and second oils extend substantially parallel to each other with a predetermined gap. An oil cooler including two tubes (110), wherein both tubes (110a, 110
b) are two plates (111, 1) in which the brazing material is coated on the surfaces corresponding to the inner wall surfaces of the tubes (110a, 110b).
12) is formed by brazing in a state where a part thereof is plastically deformed and fixed by caulking, and two plate members (111, 11) constituting the first tube (110a) are formed.
The plate member (112) located on the second tube (110b) side of 2) and the second tube (110b) 2
The first tube (11) of the plate materials (111, 112)
The plate (111) located on the 0a) side is a communicating part (110) for communicating between both tubes (110a, 110b).
In (c), a part of one of the plate members (111) is plastically deformed into a substantially U-shape, and is fixed by caulking so as to sandwich the plate member (112) on the other side.

Accordingly, in the brazing step, no jig or tool for maintaining the assembled state is required, so that capital investment and manufacturing man-hours can be reduced, and the manufacturing cost of the oil cooler 100 can be reduced.

In addition, the first and second tubes (11
The first and second plates (111, 112) can be caulked and fixed without bringing the tubes (110a, 110b) into contact with each other, so that the gap between the tubes (110a, 110b) is not reduced, and the tubes (110a, 110b) are not reduced. , The first and second plates (111, 112) can be fixed by caulking.

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

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present embodiment, the oil cooler according to the present invention cools oil such as engine oil for lubricating sliding parts in an engine (not shown) and fluid (ATF) for automatic transmission. FIG. 1 is a perspective view showing a state in which an oil cooler 100 according to the present embodiment is housed in a radiator 200, and FIG.
Is an aluminum radiator tube 210 through which engine cooling water (hereinafter abbreviated as cooling water) flows, and an aluminum radiator tube 210 disposed at both ends in the longitudinal direction of the radiator tube 210 and communicated with a plurality of radiator tubes 210. Radiator tank (hereinafter abbreviated as tank) 2
20 and the oil cooler 10
No. 0 is stored in the tank 220 with its longitudinal direction coinciding with 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. Then, as shown in FIG. 3, the oil cooler 100 separates two flat oil tubes (hereinafter abbreviated as tubes) 110 through which oil flows, with a predetermined gap δ1. By disposing in the tank 220 so as to extend substantially parallel to each other in this state, the oil and the cooling water exchange heat to cool the oil.

Hereinafter, the tube 110 on the upper side of the paper is referred to as a first tube 110a, and the tube 1 on the lower side of the paper is referred to as a first tube 110a.
10 is referred to as a second tube 110b, and both tubes 11
The tubes 110 are generally referred to as 0a and 110b.

Further, 120 increases the heat transfer area between the oil and the tube 110, and also increases the oil and the tube 1
In the present embodiment, an offset fin in which plate-like segments 121 substantially parallel to the minor diameter direction are provided in a staggered manner in the longitudinal direction of the tube 110 is used. Is adopted.

Here, the tube 110 is connected to the tube 11
The first and second plates 111 and 112 are formed by pressing a aluminum plate having a brazing material coated (cladded) on a surface corresponding to an inner wall surface of the aluminum plate.
And the inner fin 12 between the plates 111 and 112.
This is configured by brazing in a state where 0 is provided.

At this time, as shown in FIG.
First and second plates 111 constituting the tube 110a,
112, the second plate 112 located on the second tube 110b side, and the first tube 11 of the first and second plates 111, 112 constituting the second tube 110b.
The first plate 111 located on the side of the tube 0a is connected to one of the plates (in the present embodiment, the second plate 110a) in the communicating portion 110c for communicating between the tubes 110a and 110b.
A part of the first plate 111) of the tube 110b is substantially U
The other side of the plate material (in this embodiment,
The second tube 112 of the first tube 110a is sandwiched and fixed by swaging. Hereinafter, a portion plastically deformed (crimped) into a U-shape is referred to as a crimping portion 110d.
Call.

Incidentally, in this embodiment, the communication portion 110c
As shown in FIG. 2 (b), a total of two locations are provided on both ends in the longitudinal direction of the tube 110.
As shown in (b), the stepped portions 111 are attached to the plates 111 and 112 of the adjacent tubes 110 at the communicating portion 110c.
a and 112a are formed to secure the gap δ1.

The second plate 112 is provided with an annular burring portion 112a formed by burring and extending toward the first plate 111. The first plate 111 has a second 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, the burring portion 112a is passed through a through hole formed at the bottom of the concave portion 111a, and then the burring portion 112a is formed.
a is plastically deformed so as to expand toward the outside of the diameter of the through hole, and caulked and fixed.
The two plates 111 and 112 and the inner fin 120 are brazed and joined with a brazing material clad (coated) on the inner surfaces of the first and second 112.

Incidentally, in a portion of the oil cooler 100 (tube 110a) corresponding to the communication portion 110c,
As shown in FIG. 3B, an annular extending portion (burring portion) 114 part of which extends toward the tank 220 is integrally formed by burring.
14 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 that a part of it is expanded (expanded) and caulked.

At this time, the extension part 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 (tube 110) to an external pipe (not shown). One end of the connection pipe 130 is inserted into the tube 110. It is expanded in the state and fixed by caulking.

Next, a method of manufacturing the oil cooler 100 and a method of attaching the oil cooler 100 to the tank 220 will be described in the order of the steps.

1. Method of manufacturing oil cooler First and second plates 111 and 112 and inner fin 1
20 are sequentially laminated to assemble the oil cooler 100 (lamination assembling step). Next, after penetrating the burring portion 112a into a through hole formed at the bottom of the concave portion 111a, a part of the burring portion 112a is directed to the outside of the through hole as shown in FIG. While being plastically deformed so as to expand, it is fixed by caulking (first caulking step), and the caulking portion 110d is caulked in a U-shape (second caulking step).

Then, the first and second plates 111 and 112 and the inner fin 120 temporarily fixed in the first and second caulking steps are heated in a furnace and brazed (first brazing step). At this time, the first and second plates 111 and 112 and the inner fin 120 are brazed and joined with the brazing material coated on the inner wall of the tube 110.

2. Method of attaching oil cooler 100 to tank 220 First and second plates 111 and 112 and inner fin 1
20 is inserted into the through hole 221 of the tube 110 (in the state shown in FIGS. 2 and 3) to which the brazing tube 20 has been brazed, and the end thereof is expanded to expand the oil cooler 100 (the tube 110). Is fixed to the tank 220 (third caulking process).

Next, one end of the connection pipe 130 is inserted into the tube 110, and the end of the connection pipe 130 on the tube 110 side is expanded to fix the connection pipe 130 to the tube 110 (fourth 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 connection pipe is formed with the brazing material coated on the inner surface of the extension 114 (first plate 111). 130 is brazed to the extension 114 (second brazing step).

In the 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 (effects) of this embodiment will be described.

In the present embodiment, the first and second plates 111 and 112 constituting the tube 110 are
In addition, since the brazing is performed while being fixed (temporarily fixed) by the burring portion 112a, no jig or tool for maintaining the assembled state is required in the first brazing step. Therefore, the capital investment and the number of manufacturing steps can be reduced, so that the manufacturing cost of the oil cooler 100 can be reduced.

In the case where a plurality of tubes 110 are provided, it is necessary to connect the plurality of tubes 110 to any one of the portions. , 2 plates 1
By caulking and fixing 11, 112, the first and second
The first and second plates 111 and 112 can be caulked and fixed without bringing the tubes 110a and 110b into contact with each other. Therefore, the first and second plates 111 and 112 constituting the tube 110 can be caulked and fixed without reducing the gap δ1 between the tubes 110.

The extending portion 114 is formed in the tank 220, penetrates the through hole 221, extends to the outside of the tank 220, and is caulked to the tank 220, so that the oil cooler 100 (oil tube 110) is The structure is fixed 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).

Further, the extension 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.

In the second brazing step, the oil cooler 100 is reheated while the first and second plates 111 and 112 are caulked and fixed at the caulking portion 111d and the burring portion 112a. It is possible to prevent the oil cooler 100 from being disassembled.

Therefore, the inner wall 220a of the tank 220
A predetermined gap δ2 (see FIG. 5) can be secured between the oil cooler 100 and the oil cooler 100 (the oil tube 110).
0 (oil tube 110), the cooling water can be reliably circulated, and the heat transfer area between the oil cooler 100 and the cooling water can be prevented from decreasing.

Further, since the gap δ1 is also provided between the tubes 110, it is possible to prevent the heat transfer area between the oil cooler 100 and the cooling water from being reduced.

(Other Embodiments) In the above embodiment, two tubes 110 are used. However, the present invention is not limited to this, and three or more tubes may be used.

In the above embodiment, the tube 11
However, the present invention is not limited to this. For example, the first and second plates 111 and 112 forming the tubing 110 may be expanded.
The first and second plates 111 and 112 may be caulked so as to be curled in a U-shape.

In the above-described embodiment, the extension portion 114 is caulked while the first and second plates 111 and 112 and the inner fin 120 are brazed. However, the present invention is not limited to this. 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 process.

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.

[Explanation of symbols]

100 ... oil cooler, 110 ... tube, 110a ...
1st tube, 110b ... 2nd tube, 111 ... 1st
Plate (plate material), 112... Second plate (plate material).

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B23K 1/00 330 B23K 1/00 330H

Claims (3)

[Claims] An oil for heat exchange with cooling water in a radiator tank (220) flows, and first and second tubes (110a, 110b) extending substantially parallel to each other with a predetermined gap therebetween. The two tubes (110a, 110b) include two plates (111, 112) each having a surface corresponding to the inner wall surface of the tubes (110a, 110b) covered with a brazing material. A part thereof is plastically deformed and brazed in a state of being caulked and fixed, and the second tube (111, 112) constituting the first tube (110a) is formed by the second tube ( 110
b) and the two plate members (111, 11) constituting the second tube (110b).
The plate member (111) located on the first tube (110a) side in 2) is characterized in that at least one of the plate members (111) is caulked and fixed by plastically deforming a part thereof. Oil cooler. 2. A plate member (112) located on the second tube (110b) side of the two plate members (111, 112) constituting the first tube (110a), and the second tube (110b). ), The first tube (110) of the two plate members (111, 112).
The plate material (111) located on the a) side corresponds to both tubes (1).
Communication part (110c) for communicating between 10a and 110b)
The oil cooler according to claim 1, wherein at least one of the plate members (111) is fixed by caulking by plastically deforming at least one of the plate members (111). 3. A first and a second tube (110) extending through the radiator tank (220) and substantially in parallel with each other in a state in which oil that exchanges heat with the cooling water in the radiator tank (220) flows and has a predetermined gap. An oil cooler, wherein the two tubes (110a, 110b) each include two plate members (111, 112) each having a surface corresponding to the inner wall surface of the tubes (110a, 110b) covered with a brazing material. The second tube (110) of the two plate members (111, 112) constituting the first tube (110a) is formed by brazing in a state where the portion is plastically deformed and fixed by caulking.
b) and the two plate members (111, 11) constituting the second tube (110b).
The plate material (111) located on the first tube (110a) side in 2) means both tubes (110a, 110).
b) In the communicating portion (110c) for communicating between them, a part of one of the plate members (111) is plastically deformed into a substantially U-shape and fixed by caulking so as to sandwich the other plate member (112). An oil cooler characterized in that: