JPH0715665Y2 - Joining structure of metal members - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joining structure for joining metal members by brazing, and more particularly to a joining structure for metal members capable of improving liquid tightness.

[0002]

2. Description of the Related Art Many brazing methods for joining metal members by heating and melting a brazing material having a melting point lower than that of any of the metal members to be joined and filling the gaps between the metal members with each other are performed. It is performed in the metal processing field. Figure 10
FIG. 1 is an example of a joining structure of metal members by brazing, and shows a case where it is applied to a reservoir tank that stores oil for power steering of an automobile, for example. In the figure,
Reference numeral 1 denotes a reservoir tank, and 2 denotes a bracket for holding the reservoir tank 1. Bracket 2
Is bent in a substantially V shape, and one side surface thereof is in close contact with the end portion of the reservoir tank 1. The reservoir tank 1 and the bracket 2 are provided with holes 1a and 2a. Pipe-shaped bushes 3 forming oil passages are inserted into the holes 1a and 2a.

When the reservoir tank 1, the bracket 2 and the bush 3 are joined by brazing, a ring-shaped brazing material 4 is set on the outer periphery of the bush 3. In this state, each member is put in a furnace and heated. Reservoir tank 1
When the bracket 2 and the bush 3 are heated, the molten brazing filler metal 4 flows into the gap at the joint, and the gap is filled with the molten brazing filler metal. When the gap between the members is filled with the brazing material, the members are unloaded from the furnace. When the brazing filler metal 4 penetrates into the gap, metal bonding is performed due to the wetting phenomenon, so that the reservoir tank 1 and the bracket 2 taken out of the furnace
The bush 3 is firmly joined.

[0004]

[Problems to be Solved by the Invention] However, FIG.
In the case of the joint structure shown in, the liquid-tightness (hermeticity) of the joint
There was a problem as a configuration for maintaining. 11 is shown in FIG.
It shows a partially enlarged view of. Conventionally, FIG.
Even if the brazing filler metal 4 flows into the A joining portion of No. 1, the brazing filler metal 4 does not flow into the B joining portion due to variations in the processing accuracy of the joining members. In this case, by injecting the brazing material 4 between the one side surface 1b of the reservoir tank 1 and the one side surface 2b of the bracket 2, the liquid tightness can be improved. It was difficult to make a liquid-tight structure due to generation. That is, since the reservoir tank 1 and the bracket 2 are joined by spot welding before being put into the furnace, the reservoir tank 1
The amount of the gap between the bracket 2 and the bracket 2 varies greatly due to the influence of spot welding. When the variation in the gap is large, the amount of the gap may be too large with respect to the amount of the brazing filler metal, and the brazing filler metal is not completely filled in the joint surface, resulting in pinholes. On the contrary, if the gap amount is smaller than the amount of the brazing filler metal, the surplus brazing filler metal protrudes from the range of the joint surface L, resulting in dripping of the brazing filler metal, resulting in poor appearance. Thus, the liquid tightness of the joint portion by brazing is important for preventing oil leakage.

It is an object of the present invention to provide a metal member joining structure which can improve the liquid-tightness of a joining portion and can prevent deterioration of the appearance of the joining member due to wax dripping.

[0006]

MEANS FOR SOLVING THE PROBLEMS The joining structure of metal members according to the present invention for achieving this object is as follows. A first metal member and a second metal member that are overlapped with each other, and a brazing material that is placed on the side of one of the first metal member and the second metal member and is in a molten state by a heating source. And the molten metal is formed on the metal member of the first metal member and the second metal member on the side where the brazing material is arranged, and the molten brazing material is provided between the first metal member and the second metal member. A hole formed between the first metal member and the second metal member for allowing the inflow, and a gap for radially spreading the molten brazing material flowing in through the hole outward by a capillary phenomenon; And a second metal member, which is formed on at least one of the metal member and the second metal member, and which is located outside the hole and prevents diffusion of the molten brazing material in the radial direction by the gap. Characteristic metal member joining structure.

[0007]

In the joining structure of the metal members thus configured, the first metal member and the second metal member are superposed, and the brazing material is arranged on one of the metal members. When the first metal member and the second metal member are heated by the heating source in this state, the brazing filler metal melts, and the molten brazing filler metal passes through the holes formed in the metal member and the first metal member and the second metal member.
Flows into the gap between the metal members. The molten brazing material from the holes surely diffuses outward in the radial direction due to the capillary phenomenon due to this gap. Since at least one of the first metal member and the second metal member is formed with a recess located outside the hole, diffusion of the molten brazing filler metal radially outward due to the capillary phenomenon is caused by the recess. Blocked by. Therefore, between the hole and the recess, which are the joining range,
The molten brazing filler metal is surely filled, and the first metal member and the second metal member are joined by the wetting phenomenon of the molten brazing filler metal. Further, since the joining of the first metal member and the second metal member is made more reliable, even if the amount of the brazing material is increased with respect to the gap amount, the brazing material protruding from the joining portion is stored in the concave portion. The deterioration of the external appearance of the joining member due to the conventional drooling is prevented.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of a metal member joining structure according to the present invention will be described below with reference to the drawings.

First Embodiment FIGS. 1 to 5 show a first embodiment of the present invention.
In particular, it shows an example applied to a reservoir tank that stores oil used for power steering of an automobile.
As shown in FIG. 4 and FIG. 5, reference numeral 11 denotes a reservoir tank formed in a cylindrical shape as a first metal member. One end of the reservoir tank 11 has a flat surface 11a.
And the other is formed on the inclined surface portion 11b. A bracket 12 as a second metal member is attached to the end of the reservoir tank 11 and is bent in a substantially V shape. That is, the bracket 12 is the reservoir tank 11
Are overlaid on. A hole 12a is formed in the bracket 12, and the hole 12a is the hole 1 of the reservoir tank 11.
Aligned with 1c. Aligned holes 11
Bushings 13 in which oil passages 13a are formed are inserted into c and 12a. A return pipe 14 for returning the stored oil is provided on the side surface of the reservoir tank 11.
Is installed. A cover 15 is attached to the other end of the reservoir tank 11.

The reservoir tank 11 is a thin steel plate (JI
S, SCP28F) is produced by press molding, and the bracket 12 is also made of thin steel plate (JIS, SP).
(C28C) is manufactured by press molding. The bush 13 is manufactured by machining a round steel bar (SS41). When the reservoir tank 11 is press-molded, the recess 16 extending in the circumferential direction is formed in the inclined surface portion 11b. The recess 16 has a hole 1 into which the bush 13 is inserted.
It is located on the outer circumference of 1c. The recess 16 is recessed inward of the reservoir tank 11 and has a circular cross section.

Next, the operation of the first embodiment will be described. As a preparation step for the brazing operation, first, the bracket 12 is superposed on the reservoir tank 11, and the bracket 12 is attached to the reservoir tank 11 by spot welding. In this state, the holes 11c and 12a are aligned so that the bush 13 can be inserted. Next, the bush 13 is inserted into the holes 11c and 12a. When the bush 13 is inserted, a ring-shaped brazing material 18 is set on the outer circumference of the bush 13. In this state, the reservoir tank 11, the bracket 12 and the bush 13 are put in a gas furnace as a heating source. 800-10 in the furnace
The temperature is 00 ° C, and this heat causes the reservoir tank 1
1, the bracket 12 and the bush 13 are heated. When each metal member is heated to a high temperature, the brazing filler metal 18 set on the outer periphery of the bush 13 melts, and the brazing filler metal 18 flows into the gap between the joints due to the capillary phenomenon.

The hole 12a of the bracket 12 and the bush 13
The brazing filler metal that has passed through the gap between and then flows into the gap between the reservoir tank 11 and the bracket 12, and diffuses radially outward due to the capillary phenomenon. Here, a concave portion 1 extending in the circumferential direction is formed on the inclined surface portion 11b of the reservoir tank 11.
Since 6 is formed, the diffusion of the molten brazing material 18 due to the capillary phenomenon is prevented from unnecessarily expanding. That is, since the capillary phenomenon is a phenomenon in which the liquid enters the narrow gap, the capillary phenomenon does not occur when a large space is formed by forming the recess 16. Therefore, if the amount of the brazing material 18 is set to such an extent that the gap between the joint surface of the reservoir tank 11 and the joint surface of the bracket 12 is surely filled, the pinhole due to the shortage of the brazing material at the joint portion. Does not occur, and the liquid-tightness of the joint is improved. Further, in consideration of variations in metal working conditions, the joint surface of the reservoir tank 11 and the bracket 12
Even when the amount of the brazing material 18 with respect to the amount of the gap between the joining surface and the joining surface is increased, the brazing material 18 protruding from the joining portion is stored in the concave portion 16, so that the appearance of the joining member due to the conventional drooping of the brazing material is reduced. Deterioration is prevented. When brazing of the reservoir tank 11, the bracket 12 and the bush 13 is completed by heating in the furnace, these are carried out of the furnace and transferred to the next step.

Second Embodiment FIG. 6 shows a second embodiment of the present invention. The second embodiment is different from the first embodiment in the position of the recess, and the other portions are the same as those in the first embodiment.
The same reference numerals as those in the embodiment are used to omit the description of the corresponding portions, and only different portions will be described. The same applies to other embodiments described later. In the first embodiment, the recess 16 is formed in the reservoir tank 11, but in the present embodiment, the recess 16 is formed in the bracket 13. The recess 16 in the present embodiment is formed by press molding.
The recess 16 faces the inclined surface 11b of the reservoir tank 11 and is recessed in a direction away from the inclined surface 11b. In the second embodiment having such a configuration, the size of the bracket 12 is smaller than that of the reservoir tank 11, so the condition for press-forming the recess 16 is better than that of the first embodiment. Other functions are the same as in the first embodiment.

Third Embodiment FIG. 7 shows a third embodiment of the present invention. In the first and second embodiments, the recess is formed in a ring shape extending in the circumferential direction, but in this embodiment, the reservoir tank 11 is formed.
This is dealt with by projecting a part of the inclined surface 11b as the joint surface 11d. That is, in this embodiment, a part of the inclined surface 11b is projected as the joint surface 11d to form the concave portion 21 on the outer peripheral portion thereof.
In the third embodiment having such a configuration, the recess 21 prevents the diffusion of the molten brazing material due to the capillary phenomenon from unnecessarily increasing. Further, even when the brazing material runs off from the joint portion, the brazing material can escape into the recess 21. Since the concave portion 21 is a portion that is difficult to see from the outside, deterioration of the external appearance is prevented even if wax drips occur. FIG. 8 shows a modification of the third embodiment. In this modified example, a part of the bracket 12 facing the inclined surface 11b of the reservoir tank 11 is projected as the joint surface 12d. Even in the case of such a configuration, the recess 21 can be formed and the same effect as that of the third embodiment can be obtained.

Fourth Embodiment FIG. 9 shows a fourth embodiment of the present invention. The first to third embodiments have been applied to the reservoir tank for the power steering of the automobile, but this embodiment shows an example in which two metal members are joined by brazing. As shown, the first metal member 31 and the second metal member 31
The metal member 32 is made of a steel plate, and the second metal member 32 is superposed on the first metal member 31.
The first metal member 31 is provided with a hole 33 for allowing the brazing material to flow therein. The outer periphery of the hole 33 of the first metal member 31 is radially outside the molten brazing filler metal flowing into the gap between the joint surface 31a of the first metal member 31 and the joint surface 32a of the second metal member 32. A recess 34 is formed to prevent the diffusion toward one side. As described above, in the fourth embodiment configured as described above, the molten brazing filler metal is supplied from the hole 33 to both metal members 3
It flows into the gap between 1 and 32 and diffuses outward in the radial direction due to the capillary phenomenon. However, since the concave portion 34 is formed in the first metal member 31, the diffusion of the brazing filler metal does not occur in the concave portion 34.
Blocked by. This embodiment can cope with joining when metal members are different and cannot be welded, and moreover, pinholes due to lack of brazing material can be reliably prevented. Compared to this, it is possible to greatly increase the value.

[0016]

According to the present invention, a brazing material which is in a molten state by a heating source is arranged on the metal member side of either one of the first metal member and the second metal member which are superposed, A hole for allowing the molten brazing material to flow between the first metal member and the second metal portion is formed in the metal member of the first metal member and the second metal member on the side where the brazing material is arranged, The molten brazing filler metal that has flowed in through the hole due to the gap formed between the first metal member and the second metal member is diffused outward in the radial direction by the capillary phenomenon, and the first metal member and the second metal member. At least one of them is provided with a concave portion which is located outside the hole and which prevents diffusion of the molten brazing filler metal outward in the radial direction due to the gap, so that the molten brazing filler metal can be reliably filled in a predetermined joining range, It is possible to improve the liquid tightness of the joint portion. Further, even when an excess amount of molten brazing material is supplied to ensure reliable joining, the excess brazing material protruding from the joining portion is stored in the concave portion, so deterioration of the external appearance of the joining member due to brazing sag is prevented. be able to.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of a metal member joining structure according to a first embodiment of the present invention.

FIG. 2 is a perspective view of a reservoir tank in FIG.

3 is a cross-sectional view taken along the line III-III in FIG.

FIG. 4 is an assembled perspective view of the reservoir tank of FIG.

5 is an exploded perspective view of the reservoir tank of FIG.

FIG. 6 is a cross-sectional view of an essential part of a metal member joining structure according to a second embodiment of the present invention.

FIG. 7 is a sectional view of an essential part of a metal member joining structure according to a third embodiment of the present invention.

8 is a cross-sectional view showing a modified example of FIG.

FIG. 9 is a sectional view of an essential part of a metal member joining structure according to a fourth embodiment of the present invention.

FIG. 10 is a sectional view showing an example of a conventional joining structure of metal members by brazing.

11 is a partially enlarged cross-sectional view of FIG.

[Explanation of symbols]

 11 1st metal member (reservoir tank) 12 2nd metal member (bracket) 13 Bush 16 Recessed part 18 Brazing material 21 Recessed part 31 1st metal member (steel plate) 32 2nd metal member (steel plate) 34 Recessed part

Claims (1)

[Scope of utility model registration request] 1. A first metal member and a second metal member which are superposed on each other.
Metal member, a brazing material which is arranged on the side of one of the first metal member and the second metal member and which is in a molten state by a heating source, the first metal member and the second metal member. Of the metal member on the side on which the brazing material is arranged, and the molten brazing material is used as a first metal member and a second metal member.
Formed between the first metal member and the second metal member, and the molten brazing material flowing from the hole is diffused radially outward by a capillary phenomenon. A gap and a recess formed in at least one of the first metal member and the second metal member and located outside the hole, and preventing diffusion of the molten brazing filler metal in the radial direction by the gap. And a joining structure for metal members.