JP2000249491A - Tank for heat exchanger and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance pressure tightness of a tank by forming a step offset to the upper surface side at the circumferential part of a tank forming member under a state where a click is not yet tightened to the outer fringe part facing the outer end face of the circumferential part of the tank forming member thereby imparting a high durability against deformation to the bent click. SOLUTION: A recess or a cut 9 is made previously in the direction along the outer end face 4b at the circumferential part 4a of a tank forming member 4 on the inner surface side at the boundary of a click 6 and the outer fringe part 3b. The part of the click 6 is then pushed stepwise from the side to form a step where the part of the click 6 is offset to the upper surface side at the circumferential part 4a of the tank forming member 4 with respect to the outer fringe part 3b. The click 6 formed at the step is bend to the upper surface side at the circumferential part 4a of the tank forming member 4 to complete a tightened structure. Since the click 6 formed stepwise is bent and tightened, inner root part of the click 6 can be bent substantially perpendicularly to the outer fringe part 3b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger tank and a method of manufacturing the same, and more particularly, to a method of forming a tank using a seat plate on a heat exchanger core side and a tank forming member disposed opposite to the seat plate. The present invention relates to an improvement in the structure of a caulked portion of both members.

[0002]

2. Description of the Related Art In a heat exchanger for a vehicle such as an intercooler, a radiator, an oil cooler or the like, a tank is provided with a seat plate joined to, for example, a heat exchanger core side and a seat plate attached to the seat plate. It is formed by caulking a tank forming member disposed so as to face the outer peripheral portion. Usually, a gasket is interposed between the peripheral edge of the tank forming member and the peripheral edge of the seat plate in order to ensure sealing performance.

The caulked portion of such a heat exchanger tank is formed, for example, as shown in FIG. The tank forming member 1 is attached to the seat plate 102 joined to the heat exchanger core portion 101.
The gasket 105 is interposed between the periphery 103 a of the tank forming member 103 and the periphery 102 a of the seat plate 102.
A claw 106 is formed at the tip of the peripheral portion 102a of the seat plate 102 (FIG. 4A). The claw 106 is bent toward the upper surface of the peripheral portion 103a of the tank forming member 103 and caulked ( FIG. 4 (B)). Figure 4 shows the state after crimping.
As shown in (C), simply bending the claw 106 formed as an extension of the peripheral edge portion 102a of the seat plate 102 as described above may not be able to fully bend the claw 106. The caulking may be insufficient and a sufficiently high pressure resistance of the tank may not be obtained.

Further, as described above, the claw 1 having a simple plate shape is used.
06 is simply bent, for example, as shown in FIG.
As shown in the figure, a larger or smaller R portion 107 is formed inside the bent base of the claw 106. This R section 107
Is the peripheral portion 103a of the tank forming member 103 around it.
And a gap may be generated between them, and caulking may be insufficient. Furthermore, the bent nail 10
The point at which 6 starts contacting the upper surface of the peripheral portion 103a of the tank forming member 103 is separated from the bent base of the claw 106. As a result, the point of action of the force existing after the point at which the contact starts and acting on the pawl 106 from the tank forming member 103a due to the internal pressure of the tank 104 and trying to lift the pawl 106 in the anti-bending direction. Then, the distance between the fulcrum regarding the force, that is, the bent base portion, increases, and the moment increases, so that the claw 106 is easily lifted. The lifting of the claws 106 lowers the pressure resistance.

To solve such a problem, Japanese Utility Model Laid-Open Publication No.
Japanese Patent Publication No. 84 proposes a structure in which a groove is formed in advance at the base of a caulking claw. In this proposal, for example, as shown in FIGS.
Grooves 203, 303 are formed at the roots of the claws 202, 302 provided at the distal ends of the first peripheral portions 201a, 301a, so that the claws 202, 302 can be easily bent into a predetermined shape.

However, in the structure in which the concave groove 203 is provided on the outer surface side as shown in FIG. 5A, when the claw 202 is bent toward the upper surface side of the tank forming member 204 and the caulking is performed, the R portion 205 is still inside the claw 202. The problem of being formed remains. Also, as shown in FIG.
In the structure where is provided, after the claw 302 is bent toward the upper surface side of the tank forming member 304, a folding surface 305 formed at the boundary between the claw 302 and the peripheral portion 301a extends obliquely upward. When a force that causes the claw 302 to lift is applied to the crimped claw 302, the fulcrum 306 of the deformation of the claw 302 rises because the folding surface 305 extends obliquely upward.
The distance 308 between the reference numeral 07 and the fulcrum 306 becomes longer, the arm of the moment becomes longer, and the resistance to lifting of the claw 302 decreases accordingly.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to focus on the problems in the prior art as described above, and to receive a deforming force applied to a crimped claw with high strength. Another object of the present invention is to provide a heat exchanger tank and a method for manufacturing the same, which can realize high pressure resistance of the tank.

[0008]

In order to solve the above-mentioned problems, a heat exchanger tank according to the present invention comprises a seat plate provided on a heat exchanger core portion side and a gasket interposed at a peripheral portion thereof. A tank for a heat exchanger in which a tank forming member is disposed to face and a claw provided on a peripheral portion of a seat plate is bent toward an upper surface side of a peripheral portion of the tank forming member to fix the tank forming member to a seat plate and fix the same. , The claw, at the periphery of the seat plate,
An outer edge portion facing the outer edge surface of the tank forming member peripheral edge portion is formed in a stepped portion offset to the upper surface side of the tank forming member peripheral edge portion in a state before crimping.

In this heat exchanger tank, a recess or notch extending in the direction along the outer end surface of the peripheral portion of the tank forming member is formed in advance between the claw and the outer edge portion.
The claw may be offset at the concave or cut portion.

[0010] Further, it is preferable that, in a state where the claw is bent, R of the inside bent portion between the claw and the outer edge is substantially zero.

Further, in this heat exchanger tank,
In a state where the claw is bent, a fold surface formed to extend inwardly between the claw and the outer edge portion in a thickness direction extends substantially in the same direction as the inner side plate surface of the outer edge portion. It can be structured.

[0012] In the method for manufacturing a heat exchanger tank according to the present invention, a tank forming member is opposed to a seat plate provided on the heat exchanger core side with a gasket interposed at a peripheral edge portion. In a method for manufacturing a heat exchanger tank in which a claw provided on a peripheral portion is bent toward the upper surface side of the peripheral portion of the tank forming member to caulk and fix the tank forming member to the seat plate, The outer edge of the portion facing the outer edge of the tank forming member is formed at a step offset to the upper surface of the tank forming member, and then the nail is bent toward the upper surface of the tank forming member. And crimping.

In this method, before forming the step portion,
A recess or notch is formed between the claw and the outer edge to extend in a direction along the outer end surface of the tank forming member peripheral portion, and the claw is offset at the recess or cut to form the step. You may make it. Alternatively, the claw can be formed in a stepped shape before swaging without forming such a concave streak or cut.

In the heat exchanger tank and the method for manufacturing the same according to the present invention as described above, the claw formed on the stepped portion offset to the upper surface side of the peripheral portion of the tank forming member before crimping is formed. When bent to the upper surface side of the peripheral portion of the tank forming member, as shown in an embodiment described later, it becomes possible to caulk without substantially forming an R portion at the base of the claw. Further, the folded surface formed between the bent claw and the outer edge of the seat plate can be formed so as to extend in substantially the same direction as the inner side plate surface of the outer edge. As a result, the distance between the fulcrum and the point of application of the force to lift the bent claw, which is caused by the tank internal pressure, is kept to a minimum, the moment is kept small, and the claw has a high deformation resistance. Performance is ensured. Therefore, the pressure resistance of the tank is also kept high.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 and FIG.
1 shows a heat exchanger tank according to an embodiment of the present invention and a method for manufacturing the same. In FIG. 1, reference numeral 1 denotes a heat exchanger tank, and the tank 1 includes a heat exchanger core 2
The seat plate 3 is provided on the side, and the tank forming member 4 is disposed opposite to the seat plate 3. Peripheral part 3 of seat plate 3
A gasket 5 is interposed between a and the peripheral portion 4a of the tank forming member 4 to seal this portion. The peripheral edge 3a of the seat plate 3 has an outer edge 3b that rises facing the outer end face 4b of the peripheral edge 4a of the tank forming member 4, and a suitable number of claws 6 are further extended on the tip side of the outer edge 3b. Has been established.

The claw 6 is bent toward the upper surface side of the peripheral portion 4a of the tank forming member 4 and, with the gasket 5 interposed, the peripheral portion 4a of the tank forming member 4 with respect to the peripheral portion 3a of the seat plate 3.
a is caulked and fixed. R of the inner bent portion 7 between the bent claw 6 and the outer edge portion 3b is substantially 0, and in the present embodiment, is bent substantially at a right angle.

Further, a folded surface 8 is formed between the claw 6 and the outer edge portion 3b so as to extend in the plate thickness when the claw 6 is bent. This folding surface 8
In the present embodiment, extends in the same direction as the inner side plate surface of the outer edge portion 3b.

The formation of the caulking portion structure as described above is performed, for example, as shown in FIGS. 2 (A), 2 (B) and 2 (C). In FIG. 2 (A), first, on the inner surface side of the boundary between the claw 6 and the outer edge 3b, a concave streak or cut 9 (extending in the direction along the outer end surface 4b of the peripheral edge 4a of the tank forming member 4 ( Hereinafter, these will be referred to as concave streaks 9). Next, as shown in FIG. 2 (B), the portion of the claw 6 is stepped from the side, and the portion of the claw 6 is offset from the outer edge 3b toward the upper surface of the peripheral portion 4a of the tank forming member 4. Formed in the part. The claw 6 formed in this step is bent toward the upper surface side of the peripheral portion 4a of the tank forming member 4 as shown in FIG. 2C, and the crimping structure shown in FIG. 1 is completed.

However, at the time of forming the step portion, FIG.
As shown in comparison with FIGS. 3A and 3B, a method of forming the ridges 9 and the like on the base of the nail 6 as described above and then forming the ridges 9 on the step (FIG. 3A), A method of forming the step-shaped claw 6a directly by the step-pressing process without forming the step 9 (FIG. 3)
(B)), and in the latter case, the caulking step in FIG. 2 is started from the step shown in FIG. 2 (B). Furthermore, it is also possible to form the step-shaped claw at a stroke in the step of processing the seat plate.

In the above-described heat exchanger tank and the method of manufacturing the same according to the present invention, since the stepped claw 6 is bent and crimped, as shown in FIG. 1 and FIG. The inner root portion of the claw 6 can be bent substantially at right angles to the outer edge portion 3b, and the R of this portion is set to substantially 0, and the outer end surface 4b and the peripheral edge portion 4a of the tank forming member 4 are set.
A large gap can be prevented from being generated with respect to the upper surface.

Further, since the folding surface 8 can be formed on a surface extending substantially in the same direction as the inner side plate surface of the outer edge portion 3b,
Any position between the fulcrum of the force for lifting the claw 6 in the anti-bending direction due to the tank internal pressure, which is constituted by the upper end of the surface 8, and any position between the claw 6 and the upper surface of the peripheral portion 4a. Is minimal.

Therefore, the moment expressed by the product of the force at the point of action and this distance (the length of the arm of the moment) is also minimized, and the claw 6 has a structure that is extremely difficult to deform (raise up). 1, the pressure resistance is greatly improved.

[0023]

As described above, according to the heat exchanger tank and the method of manufacturing the same of the present invention, the caulking claw provided on the seat plate side is offset to the upper surface side of the peripheral portion of the tank forming member. Since the step-shaped claw is formed by bending and caulking, the R at the base of the bent claw can be made substantially zero, and the folding surface formed at the base of the claw Can be oriented in an optimal direction, and the bent claw can have extremely high resistance to deformation. As a result, the pressure resistance of the tank can be significantly improved.

[Brief description of the drawings]

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

FIG. 2 is a process chart showing a method for manufacturing the tank of FIG. 1;

FIG. 3 is a partial side view showing an example of a step formation structure of a nail.

FIG. 4 is a schematic configuration diagram showing a conventional caulking structure.

FIG. 5 is a schematic configuration diagram showing another conventional caulking structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heat exchanger tank 2 Heat exchanger core part 3 Seat plate 3a Peripheral edge of the seat plate 3b Outer peripheral edge of the perimeter of the seat plate 4 Tank forming member 4a Peripheral edge of the tank forming member 4b Outer end surface of the peripheral edge of the tank forming member 5 Gasket 6, 6a Claw 7 Inside bent part 8 Folding surface 9 Concave or cut

Claims (6)

[Claims] 1. A seat plate provided on a heat exchanger core side,
The tank forming member is disposed facing the peripheral portion with a gasket interposed therebetween, and the claw provided on the peripheral portion of the seat plate is bent toward the upper surface side of the peripheral portion of the tank forming member to thereby form the tank forming member against the seat plate. In the heat exchanger tank fixed by caulking, the claw, in the state before caulking, with respect to the outer edge of the seat plate peripheral edge facing the outer end surface of the tank forming member peripheral edge,
A heat exchanger tank formed in a step portion offset to the upper surface side of a peripheral portion of a tank forming member. 2. A groove or notch extending in a direction along an outer end surface of a peripheral portion of a tank forming member is formed in advance between the claw and an outer edge, and the claw is formed at the recess or notch. 2. The heat exchanger tank of claim 1, wherein the tanks are offset. 3. The heat exchanger tank according to claim 1, wherein R of the inside bent portion between the claw and the outer edge portion is substantially 0 when the claw is bent. 4. A folded surface formed between the claw and an outer edge portion so as to extend inward in a sheet thickness in a state where the claw is bent, is substantially the same as an inner side plate surface of the outer edge portion. The heat exchanger tank according to any one of claims 1 to 3, which extends in a direction. 5. A seat plate provided on the heat exchanger core portion side,
The tank forming member is disposed facing the peripheral portion with a gasket interposed therebetween, and the claw provided on the peripheral portion of the seat plate is bent toward the upper surface side of the peripheral portion of the tank forming member to thereby form the tank forming member against the seat plate. In the method for manufacturing a heat exchanger tank to be caulked and fixed, the claw is offset on the upper surface side of the tank forming member peripheral edge portion with respect to an outer edge portion of the seat plate peripheral edge portion facing the outer end surface of the tank forming member peripheral edge portion. A method for manufacturing a tank for a heat exchanger, comprising: forming a stepped portion; and then bending and crimping a claw to an upper surface side of a peripheral portion of a tank forming member. 6. A step or a notch extending in the direction along the outer end surface of the peripheral portion of the tank forming member is formed between the claw and the outer edge before the step is formed, and the notch or the notch is formed in the notch or the notch. Offsetting the claw to form the step portion;
A method for producing a heat exchanger tank according to claim 5.