JP2000301323A - Structure of joining parts by brazing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the manufacturing cost of a bolt-integrated type flange to which a bolt has been joined on a mounting flange part by brazing. SOLUTION: A width across flat 123 is formed on a portion coming into contact with the force-fitting hole of a bolt 120. Joining by brazing is performed while the bolt 120 has been force-fitted into the force-fitting hole of a flange part 121. Consequently, while preventing the bolt 120 from dropping out from the flange part 121 during a brazing process, a sufficient quantity of a brazing filler metal can be supplied between the external wall of the bolt 120 and the internal wall of the force-fitting hole by the brazing filler metal sucked by the width across flat 123. Therefore, since it is not necessary to form a 'spot facing', the bolt 120 and the flange part 121 can be strongly joined by brazing while reducing a manufacturing cost.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brazing structure of a brazed joint product in which a rod-shaped pin member is brazed to a plate-shaped plate member, and a bolt is brazed to a mounting flange portion of an oil cooler. It is effective when applied to the bolt integrated flange.

[0002]

2. Description of the Related Art Conventionally, a bolt is brazed to a flange while the head of the bolt is submerged in a mounting flange (hereinafter, referred to as a flange), and the bolt is joined in a furnace (during a brazing process). 9) In order to prevent the bolt from falling off the flange, as shown in FIG. 9, a "borebo" is formed on the flange 121, and the head of the bolt 120 is sunk into the "borebo". Was brazed.

[0003]

However, according to the above-mentioned means, since a "borebore" is formed in the flange, the number of man-hours for manufacturing the flange (manufacturing cost) is large, so that the manufacturing cost of the bolt-integrated flange is reduced. Has the problem of being difficult. In view of the above, an object of the present invention is to reduce the manufacturing cost of a brazed product in which a pin member such as a bolt is brazed to a plate member such as a mounting flange.

[0004]

According to the present invention, in order to achieve the above object, according to the first and third aspects of the present invention, a press-fit hole (P) in which a pin member (120) is press-fitted into a plate member (121). 122) is provided, the pin member (120) is press-fitted into the press-fit hole (122), and the press-fit hole (12) is brought into contact with the outer wall of the pin member (120).
At least one side of the inner wall surface of 2) and the outer wall of the pin member (120) that is in contact with the inner wall of the press-fit hole (122) is continuous from one end side to the other end side in the longitudinal direction of the pin member (120). It is characterized in that grooves (123, 125) which are connected to each other are provided.

[0005] Since the brazing is performed while the pin member (120) is pressed into the press-fitting hole (122) of the plate member (121), the pin member (120) is connected to the plate member (120) during the brazing process. 121) can be prevented from falling off. Therefore, when the pin member (120) is press-fitted into the press-fit hole (122) such that one end side of the pin member (120) is flush with the plate member (121), a "counterbore" is formed in the plate member (121). Without doing
One end of the pin member (120) is connected to the plate member (121).
The pin member (120) can be brazed and joined to the plate member (121) in a state where the pin member (120) is sunk inside.

As a result, the number of manufacturing steps required for joining the pin member (120) and the plate member (121) can be reduced, so that the manufacturing cost of the brazed joint product can be reduced. Further, since a gap is formed between the outer wall of the pin member (120) and the inner wall of the press-fit hole (122) by the grooves (123, 125), the outer wall of the pin member (120) and the inner wall of the press-fit hole (122) are formed. And a sufficient amount of brazing material can be supplied.

Therefore, since the pin member (120) and the plate member (121) can be firmly brazed, the reliability (durability) of the brazed product can be improved. According to the second and third aspects of the present invention, the plate member (121) is provided with the press-fit hole (122) into which the pin member (120) is press-fitted, and the pin member (120) is press-fit into the press-fit hole (122). And a pin member (12) that contacts the inner wall of the press-fit hole (122).
In the outer wall of (0), grooves (123, 12) extending continuously from one end of the pin member (120) in the longitudinal direction to the other end are provided.
5) is provided.

Thus, as in the first aspect of the present invention, the reliability (durability) of the brazed joint can be improved while reducing the manufacturing cost of the brazed joint. According to the third aspect of the present invention, the grooves (123, 12
5) is characterized in that the pin member (120) is formed to extend linearly from one end side in the longitudinal direction to the other end side.

Thus, the grooves (123, 12) can be easily formed.
5) can be formed. According to the fourth aspect of the present invention, the plate member (121) is provided with the press-fit hole (122) into which the pin member (120) is press-fitted.
A pin member (120) is press-fitted into the press-fit hole (122), and a portion of the outer wall () of the pin member (120) that comes into contact with the inner wall of the press-fit hole (122) has a pin member (120). Is characterized in that a two-face width (123) extending continuously from one end side in the longitudinal direction to the other end side is provided.

As a result, one end of the pin member (120) sinks into the plate member (121) without forming a "borebore" on the plate member (121), similarly to the first aspect of the present invention. Pin member (120)
Can be brazed to the plate member (121), so that the manufacturing cost of the brazed product can be reduced.

Further, a gap is formed between the outer wall of the pin member (120) and the inner wall of the press-fitting hole (122) by the two-sided width (123), so that the outer wall of the pin member (120) and the press-fitting hole (122) are formed. ), A sufficient amount of brazing material can be supplied to the inner wall, and the reliability (durability) of the brazed product can be improved. Incidentally, the reference numerals in parentheses of the above means are examples showing the correspondence with specific means described in the embodiments described later.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment)
A brazing product structure according to the present invention is used for a water-cooled engine
Abbreviated as engine. The oil cooler 100 is arranged in a water jacket (cooling water passage) of the engine and cools the engine oil.

FIG. 1 is a perspective view of an oil cooler 100. Reference numeral 110 denotes a well-known laminated heat exchange core in which a plurality of stainless steel plates 111 are laminated in the thickness direction to form an engine oil passage. is there. By the way,
The plate 111 constituting the heat exchange core 110 is integrally brazed by a brazing material (copper in the present embodiment) coated (plated or clad) on both front and back surfaces of the plate 111.

Reference numeral 120 denotes an iron mounting bolt (pin member) for fixing the oil cooler 100 to the inner wall of the water jacket. Reference numeral 121 denotes a substantially rhombic plate to which the mounting bolt 120 (hereinafter abbreviated as bolt 120) is joined. SPH
It is a flange portion (plate member) made of E (hot rolled steel plate). Here, as shown in FIG. 2, the bolt 120 is a columnar member such as an embedded bolt (stat bolt) having no flange portion (projection) projecting from a cylindrical portion such as a head.

On the other hand, as shown in FIG. 3, a press-fit hole 122 into which the bolt 120 is press-fitted is formed in the flange portion 121, and a side of the bolt 120 opposite to the screw portion 120a is press-fitted and fixed in the press-fit hole 122. ing. In FIG. 3, for easy understanding, the diameter of the press-fit hole 122 is sufficiently larger than the diameter of the bolt 120, but in the present embodiment, the diameter of the bolt 120 and the press-fit hole 122 is large. The fitting tolerance employs an intermediate fit in which the press-fit hole 122 side is H7 and the bolt 120 side is n6.

The press-fit hole 122 of the bolt 120
As shown in FIG. 4, a two-plane width extending from one end side of the bolt 120 in the longitudinal direction (opposite side of the screw portion 120a) to the other end side (the side of the screw portion 120a) is provided at a portion that comes into contact with the inner wall of the bolt. (Shaded portions in FIG. 4) 123 are formed. Here, the “two-sided width 123” refers to a recessed portion extending from one end side in the longitudinal direction of the bolt 120 toward the other end side while being depressed from the outer wall surface of the bolt 120 toward the center thereof. Not groove).

Next, a procedure for assembling the bolt 120 and the flange portion 121 will be described. First, as shown in FIG. 3, a bolt 120 is press-fitted into a press-fitting hole 122 of a flange portion 121 (press-fitting step), and the flange portion 121 and the plate 11 are pressed.
In the state where the brazing sheet 130 is interposed between the heat exchange core 110 and the heat exchange core 110 (the plate 1),
11) and brazing together (brazing step).

By the way, the brazing sheet 130 is
As is well known, it refers to a brazing material (in the present embodiment, copper) formed into a thin film. In the brazing step, the heat exchange core 110, the bolt 120, and the flange 121
As shown in FIG. 5, the threaded portion 120a of the bolt 120 is
Is heated in a state where is positioned on the lower side.

As a result, the brazing sheet 130 disposed between the flange portion 121 and the plate 111 brazes the flange portion 121 to the plate 111 and, as shown in FIG. 6, melts the brazing material. Part of the (brazing sheet 130) flows into the gap δ formed by the two flat surfaces 123 due to gravity and capillary action, and the bolt 120 and the flange portion 121 are firmly brazed and joined.

If the gap δ is too large, the bolt 1
In this embodiment, since the sufficient brazing material cannot be supplied between the outer wall of the press-fit hole 20 and the inner wall of the press-fitting hole 122, and there is a high possibility of causing troubles such as brazing.
It is selected to be 5 mm or less. Next, features of the present embodiment will be described.

In this embodiment, since the brazing is performed while the bolt 120 is pressed into the press-fit hole 122 of the flange 121, the bolt 120 can be prevented from falling off from the flange 121 during the brazing process. Therefore, one end side of the bolt 120 (the side opposite to the screw portion 120a,
Hereinafter, it is called the head side. If the bolt 120 is press-fitted into the press-fit hole 122 so that) is flush with the flange portion 121,
The bolt 120 can be brazed to the flange 121 with the head side of the bolt 120 sunk into the flange 121 without forming a “borebore” in the flange 121.

The bolt 120 and the flange 12
Since the number of man-hours required for joining with the oil cooler 100 can be reduced, the manufacturing cost of the oil cooler 100 can be reduced. In addition, a small gap δ is formed between the outer wall of the bolt 120 and the inner wall of the press-fit hole 122 due to the two-sided width 123, so that a sufficient amount of solder is provided between the outer wall of the bolt 120 and the inner wall of the press-fit hole 122. Material can be supplied. Therefore, the bolt 120 and the flange portion 121 can be firmly joined by brazing.

(Second Embodiment) In this embodiment, a bolt 1
As shown in FIG. 7, a knurling portion 124 is provided on a portion of the outer wall 20 that contacts the inner wall of the press-fit hole 122, as shown in FIG. Accordingly, a sufficient amount of brazing material can be supplied more reliably between the outer wall of the bolt 120 and the inner wall of the press-fit hole 122, so that the bolt 120 and the flange portion 121 can be more firmly brazed. it can.

(Third Embodiment) In this embodiment, as shown in FIG. 8, instead of the two-sided width 123, the bolt 120 is depressed from the outer wall surface toward the center thereof, and
20 from one end (head side) to the other end (screw 1
A plurality of grooves (slits, splines) 125 are formed continuously and extending toward (20a side).

(Other Embodiments) In the above-described embodiment, a two-sided width 123, a knurled portion 124, or a groove 125 is formed in a portion of the outer wall of the bolt 120 that contacts (opposes) the inner wall of the press-fit hole 122. However, in the present invention, the width across flats 123, the knurled portion 124 or the groove 125 may be formed on at least one of the contact portions (opposed portions) between the outer wall of the bolt 120 and the inner wall of the press-fit hole 122. A two-sided width 123, a knurl portion 124 or a groove portion 125 may be formed on the inner wall of the press-fit hole 122.

In the third embodiment, the groove 125 is
While the bolt 120 continuously and linearly extends from one longitudinal end to the other end of the bolt 120, it continuously extends spirally from one longitudinal end of the bolt 120 to the other end. It may be formed as follows. Furthermore, in the above-described embodiment, the present invention has been described by taking the example of joining the bolt 120 and the flange 121 as an example. However, the present invention is not limited to this, and a square rod-shaped pin member and a plate-shaped plate member It can also be applied to other brazed articles such as brazed articles.

[Brief description of the drawings]

FIG. 1 is a perspective view of an oil cooler employing a brazed joint product structure according to the present invention.

FIG. 2 is a front view of the bolt according to the first embodiment.

FIG. 3 is a cross-sectional view showing a state where a bolt is pressed into a flange portion.

FIG. 4A is a front view of a bolt head according to the first embodiment, and FIG. 4B is a side view of FIG.

FIG. 5 is an explanatory diagram showing an arrangement state of an oil cooler in a furnace.

FIG. 6 is a cross-sectional view showing a state in which a bolt is pressed into a flange portion.

7A is a front view of a bolt head according to a second embodiment, and FIG. 7B is a side view of FIG.

FIG. 8A is a front view of a bolt head according to a third embodiment, and FIG. 8B is a side view of FIG.

FIG. 9 is a cross-sectional view showing a state in which a bolt is inserted into a flange in the related art.

[Explanation of symbols]

120: bolt (pin member), 121: mounting flange part (plate member), 123: width across flats, 130: brazing sheet.

Claims (4)

[Claims] 1. A brazed joint structure in which a rod-shaped pin member (120) is brazed to a plate-shaped plate member (121), wherein the pin member (120) is attached to the plate member (121).
The pin member (120) is press-fitted into the press-fit hole (122) while the press-fit hole (122) for press-fitting is provided. The inner wall surface of the hole (122) and the press-fit hole (122)
At least one of the outer walls of the pin member (120) in contact with the inner wall of the pin member (120) has grooves (123, 125) continuously connected from one longitudinal end to the other end of the pin member (120). A brazed joint structure, characterized in that: 2. A brazing structure for a brazed joint product in which a rod-shaped pin member (120) is brazed to a plate-shaped plate member (121), wherein the plate member (121) is attached to the pin member (120). )
Is provided, and the pin member (120) is press-fitted into the press-fitting hole (122), and further, the pin that comes into contact with the inner wall of the press-fitting hole (122). The pin member (120) is provided on an outer wall of the member (120).
Characterized in that grooves (123, 125) continuously extending from one longitudinal end to the other longitudinal end are provided. 3. The pin portion (123, 125) is formed so as to extend linearly from one longitudinal end to the other longitudinal end of the pin member (120). 3. The brazed joint structure according to 2. 4. A brazing structure for a brazed joint product in which a cylindrical pin member (120) is brazed to a plate-shaped plate member (121), wherein the plate member (121) is attached to the pin member (121). 120)
The pin member (120) is press-fitted into the press-fit hole (122), and the pin member (120) is further press-fitted into the outer wall of the pin member (120). A portion of the pin member (120) that comes into contact with the inner wall is provided with a two-plane width (123) that continuously extends from one end side in the longitudinal direction of the pin member (120) to the other end side. Brazed joint structure.