JP2003314761A - Connection structure of pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To restrain a pipe from rotating in tentatively fixing it. <P>SOLUTION: The pipe 8 is tentatively fixed to a pipe joint 9 by crimp parts 9b plastically deformed so as to project from the tip side to the root side of a flange part 8a. Thereby, in crimping work for forming the crimp parts 9b, force to rotate the pipe 8 does not act on the pipe 8, so that the pipe 8 is hardly rotated in tentatively fixing the pipe 8. Accordingly, in mounting a radiator 1 relative to this application on a vehicle, a problem that the connection position between another pipe connected to the pipe 8 and the pipe 8 is displaced is hardly caused, so that a problem where workability for connecting the pipe 8 to the other pipe is remarkably deteriorated barely occurs. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection structure between a built-in device built in a tank filled with a fluid and a pipe arranged outside the tank, and an oil cooler built in a tank of a radiator. It is effective when applied to a connection structure with piping connected to this oil cooler.

[0002]

[Prior Art and Problems to be Solved by the Invention]
In the invention described in Japanese Patent Publication No. 001-221048, the oil cooler is provided with a joint in which a male screw is formed, a nut is assembled to the joint from the outside of the tank material, and the tank material is sandwiched between the joint and the nut to put the oil cooler on the tank. It is fixed.

At this time, the pipe connected to the oil cooler is sandwiched between the nut and the joint, temporarily fixed to the joint, and then joined to the joint by brazing.

However, in the invention described in the above publication, since the pipe is temporarily fixed to the joint by tightening the nut in the joint, when the nut is rotated and tightened, the pipe is likely to rotate together with the nut.

At this time, in the case where the pipe is a bent pipe that is bent, if the pipe rotates during temporary fixing, the connection position with other pipes connected to this pipe shifts, so that this pipe And the workability of connecting to other piping will be significantly reduced.

In view of the above points, the present invention firstly provides a novel pipe connecting structure different from the conventional one, and secondly, suppresses the pipe from rotating during temporary fixing. To aim.

[0007]

In order to achieve the above-mentioned object, the present invention provides a built-in device (7) and a tank (7) built in a tank (6) filled with a fluid. 6) A connection structure with a pipe (8) arranged outside, so that the wall member (6c) arranged outside the tank (6) and constituting the tank (6) is sandwiched together with the built-in device (7). Has a joint (9) joined to the built-in device (7), and a flange-shaped flange portion (8a) protruding outward in the radial direction on the side of the pipe (8) connected to the joint (9). The joint (9) is plastically deformed so as to project from the tip side of the flange portion (8a) to the root side, and the caulking portion (9b) located on one side of the flange portion (8a) and the flange (9b). The crimping portion (9
b) and a seating surface (9c) located on the opposite side are provided, and the flange part (8a) is fixed between the caulking part (9b) and the seating surface (9c). The pipe (8) is brazed to the joint (9).

As a result, when forming the caulked portion (9b), a force for rotating the pipe (8) does not act on the pipe (8), so that the pipe (8) is temporarily fixed when the pipe (8) is temporarily fixed. It rarely rotates.

Therefore, according to the present invention, it is possible to obtain a novel piping connection structure different from the conventional one, and
Since the problem that the connection position between the pipe (8) and the other pipe connected to the pipe (8) is displaced is unlikely to occur, the workability of connecting the pipe (8) and the other pipe is significantly reduced. Almost no problems such as storage occur.

According to the second aspect of the invention, at least the seat surface (9c) and the flange portion (8a) are brazed, and the soldering state of the seat surface (9c) and the flange portion (8a) is visually inspected. It is characterized in that a hole (9f) that can be formed is provided.

As a result, it is possible to prevent the defective soldering from being shipped accidentally.

According to the third aspect of the present invention, when the hole (9f) is viewed from the outside in the radial direction of the pipe (8), the hole (9f) is formed.
The seat edge (9c) side of the opening edge portion of is substantially coincident with the seat surface (9c) of the seat surface (9c).

As a result, since the brazing portion can be visually checked, the defective brazing can be surely found.

In the invention according to claim 4, the pipe (8)
Is characterized by being a bent pipe.

Incidentally, the reference numerals in the parentheses of the above-mentioned respective means are examples showing the correspondence with the concrete means described in the embodiments described later.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION In this embodiment, the present invention is applied to a connection structure of an oil cooler built in a tank of a vehicle radiator and a pipe connected to the oil cooler.

FIG. 1 is a front view of the radiator 1, FIG. 2 is a three-sided view of the core side tank material, and FIG.
Is a cross-sectional view taken along the line AA and the line BB in FIG. 2, FIG. 3B is a side view of FIG. 3A, and FIG. 4 is a cross-sectional view of the oil cooler 7.

In FIG. 1, a tube 2 is a flat tube through which cooling water flows, and fins 3 formed in a wave shape are joined to the flat surface of the tube 2 to increase the heat transfer area with air.

The side plates 4 extend in parallel with the tubes 2 and reinforce the core 5 composed of the tubes 2 and the fins 3. At both longitudinal ends of the tubes 2, tanks 6 communicating with the tubes 2 are arranged. Has been done.

The tank 6 on the left side of the drawing is for supplying cooling water to each tube 2, and the right side of the drawing is for collecting and collecting the cooling water after heat exchange, and the oil cooler 7
Is built in the tank 6 on the right side of the drawing.

Incidentally, the oil cooler 7 according to this embodiment.
Is to cool the oil by exchanging heat between engine oil or ATF (automatic transmission fluid) and cooling water.

Here, the tank 6 is composed of a tank body 6a in the shape of a rectangular tube and a cap 6b for closing the longitudinal end portion of the tank body 6a. The tank body 6a is, as shown in FIG. It is configured by combining two tank materials 6c press-formed in an L or J shape.

The tubes 2, fins 3, side plates 4 and tanks 6 are all made of aluminum,
These are integrally joined by brazing. By the way,
"Brazing" refers to a technique for joining a base material using a brazing material or solder so as not to melt the base material, as described in "Connecting / Joining Technology" (Tokyo Denki University Press).

Further, the insertion hole 6d is a hole into which the tube 2 is inserted, the connection pipe 6e connects the radiator 1 and a pipe connecting the engine, and the pipe 8 is for oil connected to the oil cooler 7. Is the tube of.

Here, as shown in FIGS. 3 and 4, the oil cooler 7 is a flat tube 7a, 2 made of a combination of two plate members press-molded into a predetermined shape.
A tube-tube joint 7b for connecting the two tubes 7a to communicate the two tubes 7a, an oil cooler 7,
That is, it is composed of a nipple 7c for communicating the inside of the tube 7a with the pipe 8 side, a reinforcing plate 7d for increasing the bending rigidity of the tube 7a, and the like.

A fin 7e for increasing the heat transfer area with oil is arranged in the tube 7a, and in the present embodiment, the tube 7a, the tube-to-tube joint 7b, the nipple 7c, the reinforcing plate 7d and the fin 7e. 7e is made of aluminum and integrally joined by brazing.

By the way, the collar 7f is a ring-shaped one in which both sides of the collar are covered with a brazing material, and the nipple 7c and the tube 7a, the tube-to-tube joint 7b and the tube 7a are brazed by the collar 7f, and the fin 7e. Is fin 7e
It is joined to the inner wall of the tube 7a by the brazing material coated on both the front and back sides.

The pipe joint 9 is used to temporarily mechanically fix the pipe 9 to the nipple 7c. The pipe joint 9 is screwed to a female screw 7g formed on the inner peripheral surface of the nipple 7c. A male screw 9a is formed.

On the side of the pipe 8 connected to the pipe joint 9, there is provided a flange-shaped flange portion 8a which projects radially outward over the entire outer circumference thereof, while the pipe joint 9 has As shown in FIG. 3 (b), the flange portion 8a
Of the caulking portion 9 located on one side of the flange portion 8a by being plastically deformed into a substantially V shape so as to project from the tip end side to the root side.
b, and a seat surface 9c that is located on the opposite side of the crimped portion 9b with the flange portion 8a interposed therebetween and that faces the flange portion 8a, as shown in FIG. 3 (a).

Between the flange portion 8a and the seat surface 9c, a ring-shaped collar 9d whose front and back surfaces are coated with a brazing material is arranged, and the pipe 8 is connected to the pipe joint 9 via the collar 9d. It is brazed to.

By the way, the bearing surface 9 of the pipe joint 9
As shown in FIG. 4, the cylindrical tubular portion 9e extending from the c toward the flange portion 8a is provided with a hole portion 9f penetrating the tubular portion 9e. In the present embodiment, the number of the hole portions 9f is 9f. And the number of pipes 8
When the hole 9f is viewed from the outside in the radial direction, the seating surface 9c side of the opening edge of the hole 9f is substantially aligned with the seating surface 9c.
The hole 9f is a deformed hole having a substantially 8-shape with a substantially central portion in the major axis direction constricted.

Next, a procedure for assembling the pipe connection structure according to this embodiment will be described.

First, as shown in FIG. 3 (a), before brazing two tank materials 6c, the nipple 7c is placed in a position corresponding to the inside of the tank 6 with the nipple 7c. Of the tank material 6c from the outside of the tank 6, that is, the outside of the tank material 6c by tightening the piping joint 9 into the nipple 7c so that the tank material 6c is sandwiched between the piping joint 9 and the nipple 7c, that is, the oil cooler 7. Then, the oil cooler 7 is temporarily fixed to the tank material 6c, that is, the tank 6.

Next, with the collar 9d arranged on the seat surface 9c, the tip of the hole 9f of the tubular portion 9e is pressed toward the pipe 8 with the collar 9d in contact with the flange portion 8a. Then, a part of the tubular portion 9e is plastically deformed to form the caulked portion 9b. As a result, the flange portion 8a is sandwiched between the caulking portion 9b and the seat surface 9c and mechanically fixed, and the pipe 8 is caulked and fixed to the pipe joint 9.

After that, after the other tank material 6c, the cap 6b, the tube 2, etc. are assembled to the tank material 6c to which the oil cooler 7 is temporarily fixed, the tank 6, the core 5, the side plate 4, etc. are fixed by a jig such as a wire. While maintaining the assembled state, the whole radiator 1 including the oil cooler 7 is brazed by heating in a furnace.

Next, the features of this embodiment will be described.

In this embodiment, the caulking portion 9 is plastically deformed so as to project from the tip end side of the flange portion 8a to the root side.
Temporarily fix the pipe 8 to the pipe joint 9 with b, and
During caulking work for forming the caulking portion 9b, a force for rotating the pipe 8 does not act on the pipe 8, so that the pipe 8 hardly rotates when the pipe 8 is temporarily fixed.

Therefore, when the radiator 1 according to the present embodiment is mounted on a vehicle, the problem that the connection position of the pipe 8 with other pipes connected to the pipe 8 is not likely to occur is unlikely to occur. There is almost no problem that the workability of connecting with other piping is significantly reduced.

When the hole 9f is seen from the outside of the pipe 8 in the radial direction, the seat surface 9c side of the opening edge of the hole 9f is made to substantially coincide with the seat surface 9c, so that the flange 8a is formed.
It is possible to directly visually check the brazing state between the pipe joint 9 and the pipe joint 9, and it is possible to prevent the radiator 1 having a defective brazing from being shipped accidentally.

In this embodiment, since the collar 9d is arranged between the flange portion 8a and the seat surface 9c, when the hole 9f is seen from the radial outside of the pipe 8, the opening of the hole 9f is opened. The bearing surface 9c side of the edge portion is the flange portion 8a and the collar 9
It is desirable to set so as to match the contact surface with d.

(Other Embodiments) In the above-mentioned embodiment, the crimp portion 9b is provided at four places in the embodiment, but the present invention is not limited to this, and, for example, as shown in FIG. The caulking portion 9b may be provided in two places.

In the above embodiment, the hole 9f is provided in the tubular portion 9e, and the caulking portion 9b is formed by pressing the tip side of the tubular portion 9e from the hole 9f toward the pipe 8 side. The present invention is not limited to this, and the tubular portion 9e is provided with a plurality of notches that extend in the axial direction, and the notches are bent from the notches to project from the tip end side of the flange portion 8a to the root side. The crimped portion 9b may be provided.

In the above embodiment, the collar 9d is arranged between the flange portion 8a and the seat surface 9c. However, the collar 9d is abolished, and the flange portion 8a is provided by means such as placement brazing, thermal spraying or brush coating of brazing material. Alternatively, a brazing material may be arranged on the seat surface 9c and the flange portion 8a and the seat surface 9c may be directly brazed.

In the above-described embodiment, the present invention is applied to the connection structure of the oil cooler built in the tank of the vehicle radiator and the pipe connected to this oil cooler, but the application of the present invention is not limited to this. It is not limited to.

In the above embodiment, the pipe 8 is a bent pipe that is bent (see FIG. 2), but the application of the present invention is not limited to this, and straight pipe is adopted as the pipe 8. May be.

[Brief description of drawings]

FIG. 1 is a front view of a radiator according to an embodiment of the present invention.

FIG. 2 is a trihedral view of a core-side tank material according to the embodiment of the present invention.

3A is a cross-sectional view taken along the line AA and the line BB in FIG. 2, and FIG. 3B is a side view of FIG.

FIG. 4 is a sectional view of an oil cooler according to an embodiment of the present invention.

5 (a) is a cross-sectional view showing a connection structure in the AA cross section and the BB cross section in FIG. 2, and FIG. 5 (b) is (a).
FIG.

[Explanation of symbols]

6 ... Tank, 6c ... Tank material, 7 ... Oil cooler, 7c
... Nipple, 8 ... Piping, 8a ... Flange part, 9 ... Piping joint, 9
c ... Seating surface, 9d ... Collar, 9e ... Cylindrical portion, 9f ... Hole portion.

Claims (4)

[Claims] 1. A connection structure of a built-in device (7) built in a tank (6) filled with a fluid and a pipe (8) arranged outside the tank (6), the tank (6) Placed on the outside of the tank (6)
A joint (9) joined to the built-in device (7) so as to sandwich the wall member (6c) constituting the device together with the built-in device (7), and the joint (9) in the pipe (8) A flange-shaped flange (8a) protruding outward in the radial direction on the connection side with
The joint (9) is plastically deformed so as to project from the tip end side of the flange part (8a) to the root side, and the caulking part (9b) located on one side of the flange part (8a).
And the crimp portion (9) with the flange portion (8a) interposed therebetween.
b) and a seat surface (9c) located on the opposite side, and further, the flange portion (8a) is sandwiched between the caulking portion (9b) and the seat surface (9c) and fixed. The connection structure of the pipe, wherein the pipe (8) is brazed to the joint (9) in the opened state. 2. At least the seating surface (9c) and the flange portion (8a) are brazed, and the brazing state of the seating surface (9c) and the flange portion (8a) can be visually checked. The pipe connection structure according to claim 1, wherein a hole (9f) capable of being formed is provided. 3. The seat surface (9c) side of the opening edge of the hole (9f) is the seat surface when the hole (9f) is viewed from the outside in the radial direction of the pipe (8). The pipe connection structure according to claim 2, wherein the seating surface (9c) of (9c) substantially matches. 4. The pipe connection structure according to any one of claims 1 to 3, wherein the pipe (8) is a bent pipe.