JP4708895B2 - Brazing member and manufacturing method thereof - Google Patents

Description

  The present invention relates to a brazing member typified by a heat exchanger such as an oil cooler of an internal combustion engine. In the present specification, for clarity, “wax” such as brazing is described as “low”.

As disclosed in Patent Document 1, a brazing member in which a plurality of metal plates having brazing material layers on the surface are joined by brazing is suitably used for an oil cooler for an internal combustion engine or the like. In brazing, in order to stabilize the brazing state, a brazing jig that is put into a furnace together with a temporary assembly in which parts constituting the brazing member are temporarily assembled is used. The brazing jig adjusts the gap between the pair of lower base and upper base that sandwich the temporary assembly in the stacking direction and the metal plate generated by melting of the brazing material, that is, keeps the close state of each part. A pressure jig such as a spring or a weight that pressurizes the lower base and the upper base in a direction close to each other with a predetermined pressure is provided.
Japanese Utility Model Publication No. 5-88770

  However, in a configuration using a brazing jig that is placed in the furnace together with each part of the brazing member, the brazing jig is repeatedly exposed to high temperatures, so the dimensional accuracy decreases due to thermal deformation of the brazing jig. May be incurred. In addition, the brazing jig may be brazed with a brazing member that is a product. Furthermore, since the brazing jig is inevitably heated in the furnace, energy for the heating is wasted.

  The present invention has been made in view of such problems, and a main object of the present invention is to provide a new brazing member that does not require a brazing jig and a manufacturing method thereof.

A plurality of plates having a brazing material layer on the surface are laminated, and the brazing material layer is melted by heating at the time of brazing, so that adjacent plates in the laminating direction are brazed together with a reduction in the dimension of the core in the laminating direction. A core part attached,
A metal first housing and a second housing larger than the plate sandwiching the core portion in the stacking direction;
Before brazing, the first and second housings are pressed in the laminating direction across the core part, and elastically deformed so as to bulge out convexly on the radial center side where the core part exists. the first projecting radially outward than the outer peripheral portion of the second housing, in a state of being elastically deformed to a proper size state after brazing respect the stacking direction, these first, outer peripheral portion of the second housing A temporary fixing part that fixes the other and restrains the relative position in the stacking direction ;
have.

  According to the present invention, the first housing and the second housing are temporarily fixed by the temporary fixing portion before brazing, so that the first and second housings can be connected to the core portion without using a brazing jig. On the other hand, a predetermined compression pressure along the stacking direction can be applied. Accordingly, it is possible to omit the brazing jig, and it is not necessary to maintain or replace the brazing jig, and it is not necessary to assemble / disassemble the brazing jig. As a result of this reduction, the amount of heat consumed in the furnace is reduced, and the number of brazing members to be entered can be increased.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In order to facilitate understanding, in the following description, for the sake of convenience, the directions of “up” and “down” are used with reference to the postures of FIGS.

  1 to 4 show a first embodiment in which the present invention is applied to an oil cooler 10 as a brazing member attached to a cylinder block of an internal combustion engine. This oil cooler 10 itself is described in Japanese Patent Application Laid-Open No. 10-196367 and Japanese Patent Application Laid-Open No. 7-269321 by the applicant of the present application, and only a brief description will be given here.

  3 and 4, the oil cooler 10 includes a core portion 14 in which a plurality of metal plates 12 such as stainless steel are stacked, and oil chambers and cooling water chambers are alternately formed between the metal plates 12. There are provided a first housing 16 and a second housing 17 made of metal such as stainless steel for housing the core portion 14 so as to sandwich the core portion 14 in the stacking direction P of the metal plate 12 (vertical direction in FIG. 3). Yes. The core portion 14 penetrates in the stacking direction P and communicates with the oil chambers, and also communicates with the cooling water chambers through the metal plate 12 in the stacking direction P. A pair of cooling water passages (not shown) is formed.

  The first housing 16 is formed in a substantially bottomed cylindrical shape having one end opened, and the first and second cooling water pipes 22 and 23 are attached to the cylindrical portion 16A, and the outer surface of the bottom portion 16B having a disk shape is illustrated on the outer surface. A stainless steel mounting sheet 24 having a mounting seating surface 24A for the outer oil filter is mounted. The second housing 17 has a substantially disk shape, and its outer peripheral edge portion 17A is joined to the opening peripheral edge portion 16C of the cylindrical portion 16A of the first housing 16 so as to close the opening portion of the first housing 16. The outer peripheral edge portion 17A of the second housing 17 is bent into a shape projecting downward in a substantially channel shape so as to follow and closely contact the inner peripheral surface of the opening peripheral edge portion 16C of the first housing 16 Has been. A packing guide 30 that holds the O-ring 28 is fixed to the second housing 17.

  A distance piece 32 and a water guide 34 are disposed between the core portion 14 and the housing 16 so as to define a first gap D1 and a second gap D2 through which cooling water flows. . The water guide 34 has a substantially bottomed cylindrical shape, and an upper bottom portion 34A is joined to the uppermost surface of the core portion 14 by brazing, and a flange portion 34B projecting radially outward from a lower opening end portion. The flange portion 34B is joined to the inner peripheral surface of the housing 16 by brazing. The distance piece 32 is interposed between the bottom portions 16B and 34A so as to secure a gap between the bottom portion 16B of the first housing 16 and the bottom portion 34A of the water guide 34.

  Such an oil cooler 10 has an oil filter attached to the seating surface 24A of the mounting seat 24, and the oil filter and a hollow bolt (not shown) penetrating the through hole 36 of the oil cooler 10 through the O-ring 28. Then, the second housing 17 is fastened and fixed to the cylinder block in a liquid-tight manner.

  The engine lubricating oil fed from the engine side enters each oil chamber defined between the metal plates 12 from one first oil passage 18 and flows along the circumferential direction in each oil chamber. The oil is sent to the second oil passage 19 and sent to the oil filter through holes (not shown) formed in the distance piece 32 and the housing bottom 16B and a plurality of holes 24B formed in the mounting sheet 24. The oil filtered by the oil filter is returned to the engine side through the inside of the hollow bolt. In addition, the cooling water flowing in from the first cooling water pipe 22 enters the cooling water chambers through the first gap D1 through the one cooling water passage and flows in the circumferential direction through the cooling water chambers. It is sent out to the second cooling water pipe 23 through the cooling water passage and the second gap D2. And the oil which flows through an oil chamber is made suitable temperature with the cooling water which flows through each cooling water chamber.

  Many parts constituting the oil cooler 10 such as the metal plate 12 and the distance piece 32 described above are made of a clad material provided with a brazing material layer on both surfaces of a base material, and are brazed to each part by heating in a furnace. Joining is performed.

  A brazing procedure according to a comparative example using the brazing jig 2 will be described with reference to FIG. In general, as in this comparative example, the brazing jig 2 is assembled into the temporary assembly 1A in which the parts before brazing are assembled, placed in a furnace, and heated in the furnace to braze each part. Done. The brazing jig 2 adjusts the gap generated by the melting of the brazing material with the pair of lower base 3 and upper base 4 that sandwich the temporary assembly 1A in the stacking direction P, that is, the intimate state of each part. A pressurizing jig that pressurizes the lower base 3 and the upper base 4 with a predetermined pressure in the compression direction close to each other is provided. The pressurizing jig includes a center shaft 5 that passes through the temporary assembly 1A, the lower base 3, and the upper base 4, a stopper pin 6 that is attached to one end of the center shaft 5 and contacts the upper base 4, and a center shaft 5 A spring 7 is provided at the other end and pressurizes the lower base 3 toward the upper base 4 with a predetermined pressure of, for example, an initial load of about 800 kg. In the oil cooler 1 after brazing, the dimension in the stacking direction P is reduced by a predetermined amount α due to melting of the brazing material, as compared with the temporary assembly 1A before brazing.

  On the other hand, in the present embodiment, as shown in FIGS. 1 and 2, the dimension in the stacking direction P is a normal dimension after brazing for the temporary assembly in which the parts before brazing are assembled. Thus, using an appropriate jig such as a spring or a weight, in the stacking direction P at a load / pressure equal to or higher than the initial load (load necessary for obtaining brazing stability) in the comparative example. The first and second housings 16 and 17 are fixed by welding or the like at the temporary fixing portion 40 in a state in which the pressure is applied and the pressure is maintained, that is, in a state of being elastically deformed to the normal dimension state after brazing. , 17 are temporarily fixed in the stacking direction P. That is, the relative position in the stacking direction P of both 16 and 17 is constrained. As shown in FIG. 2, the temporary fixing portions 40 are provided at a plurality of locations at appropriate intervals in the circumferential direction along the opening peripheral edge portion 16 </ b> C of the first housing 16. In the first embodiment, the temporary fixing portion 40 is fixed to both 16 and 17 by welding such as spot welding or YAG laser welding.

  When the pressure is released after the temporary fixing, an intermediate molded body 11 as shown in FIGS. 1 and 2 is obtained. In the intermediate molded body 11, particularly in the stacking direction P, the first and second housings 16 and 17 are elastically deformed so as to bulge convexly on the radial center side, corresponding to the thickness of the brazing material layer of each component. Due to the repulsive stress / restoring force that the first and second housings 16, 17 return to their original shapes, the core part 14, the distance piece 32, and the water guide 34 sandwiched in the stacking direction P are along the stacking direction P. A predetermined compression pressure, that is, a load / pressure equivalent to the initial load acts. Therefore, without using the brazing jig 2 as in the above comparative example, the core portion 14, the distance piece 32, the water guide 34, etc. sandwiched in the stacking direction P by the first and second housings 16 and 17, A predetermined compression pressure can be applied in the same manner as when the brazing jig 2 is used. Therefore, when this intermediate molded body 11 is put in the furnace alone and heated, the above-described balance between the deformation due to thermal expansion and the gap due to the melting of the brazing material at the brazing temperature due to the temperature rise in the furnace, The gap correcting action works in the same way as when the brazing jig 2 is used, and brazing performance equal to or higher than that when the brazing jig 2 is used can be obtained. Thus, since the brazing jig 2 can be omitted, maintenance and replacement of the brazing jig 2 are not necessary, and work such as assembly / disassembly of the brazing jig 2 is not necessary, and The amount of heat consumed in the furnace is reduced by the reduction of the brazing jig 2 and the number of furnaces can be increased.

  In particular, in the first embodiment, appropriate distances D1 and D2 are secured between the first housing 16 and the core portion 14 by the distance piece 32 and the water guide 34, so that FIG. As schematically shown in FIG. 2, the first housing 16 can be elastically deformed relatively easily.

  Further, in the configuration in which the temporary fixing is performed by welding as in the first embodiment, the peripheral edge portion 16C of the opening of the first housing 16 is sufficiently secured so as to sufficiently secure the stacking direction P dimension that can be welded without impairing the press-fitting workability. The dimension of the outermost wall surface 17B of the outer peripheral edge portion 17A of the second housing 17 which is opposed to the inner surface of the second housing 17 and stably slides to become a sliding surface (sliding portion) is set.

  5 and 6 show an oil cooler 10A according to a second embodiment of the present invention. In the embodiments described later, the same components as those in the first embodiment described above are denoted by the same reference numerals, and redundant descriptions are omitted as appropriate. In the second embodiment, a plurality of temporary fixing portions 40A provided at appropriate intervals along the circumferential direction are used to crimp the opening peripheral edge portion 16C of the first housing 16 to the outer peripheral edge portion 17A of the second housing 17. They differ from the first embodiment in that both are combined and temporarily fixed in the stacking direction P. More specifically, as in the first embodiment, the first housing 16 and the second housing 17 are pressed in the stacking direction P with a predetermined pressure in a state where the parts before brazing are assembled. In the state, the bent piece portion 41 formed on the opening peripheral edge portion 16C of the first housing 16 is bent radially inward in each temporary fixing portion 40A so as to be wound around the outer peripheral edge portion 17A of the second housing 17. To be joined. Also in the second embodiment, a predetermined pressure can be applied to the core portion 14 and the like sandwiched between the first housing 16 and the second housing 17, so that the brazing jig 2 is not used. The attachment process can be performed.

  7 and 8 show a so-called housingless oil cooler 10B according to a third embodiment of the present invention. Such a housingless type oil cooler itself is known as described in Japanese Patent Laid-Open No. 10-185462, and detailed description thereof is omitted here. The housingless oil cooler 10B includes a core portion 14 in which a plurality of metal plates 12 are stacked and adjacent metal plates 12 are brazed, and a first housing 46 and a first housing 46 sandwiching the core portion 14 in the stacking direction P. 2 housing 47. However, in the third embodiment, both the first and second housings 46 and 47 have substantially the same disk shape as the metal plate 12, and the outer periphery of the core portion 14 is exposed outside without being covered by the housing. ing. That is, the first and second housings 46 and 47 can also be referred to as the outermost layer plate of the core portion 14.

  And in this 3rd Example, the temporary fix part 40B which temporarily fixes these members to the lamination direction P is provided over the outer peripheral part of the 1st, 2nd housings 46 and 47, and the outer peripheral part of the core part 14. Yes. The temporary fixing portions 40B are set at a plurality of locations at appropriate intervals in the circumferential direction. Specifically, for a temporary assembly in which each part is temporarily assembled before brazing, using an appropriate jig such as a spring or a weight so that the dimension in the stacking direction P becomes a regular dimension after brazing, In the stacking direction P with a predetermined pressure (a pressure corresponding to the above initial load (about 800 kg)) and in the state where this pressurization is maintained, that is, in the state of being elastically deformed to the normal dimension after brazing, In the stop portion 40B, the outer peripheral portions of the first and second housings 46 and 47 and the core portion 14 are fixed along the stacking direction P by YAG welding or the like.

  Also in the third embodiment, a predetermined compression along the stacking direction P is applied to the core portion 14 held by the first and second housings 46 and 47 as in the first and second embodiments. Since the pressure acts, the brazing process can be favorably performed without using the brazing jig 2.

  The characteristic technical ideas of the present invention that can be understood from the above description will be listed with reference to the above-described embodiments. However, the present invention is not limited to the above embodiments. For example, not only the oil cooler attached to the cylinder block of the internal combustion engine as in the above embodiment, but also an oil cooler attached to a transmission case of an automatic transmission, a heat exchanger other than an oil cooler, and other than a heat exchanger The present invention can also be applied to various brazing members.

  (1) A core part 14 in which a plurality of plates 12 are laminated and adjacent plates 12 are brazed together in the lamination direction P, and the first housing 16 (46) and the second housing 16 sandwiching the core part 14 in the lamination direction P A housing 17 (47), and a temporary fixing portion 40 (40A, 40B) for temporarily fixing the first and second housings 16, 17 (46, 47) in the stacking direction P before brazing. That is, the intermediate molded body 11 is formed by temporarily fixing the first and second housings 16 and 17 (46, 47) in a state in which they are pressurized in the stacking direction P, and the intermediate molded body 11 is heated. Brazing can be performed without using the brazing jig 2.

  (2) Preferably, as in the first and second embodiments, the first housing 16 has a substantially bottomed cylindrical shape having a cylindrical portion 16A surrounding the outer periphery of the core portion 14, and the temporary fixing portion 40 (40A). Is provided along the connecting portion between the opening peripheral edge portion 16C of the cylindrical portion 16A and the outer peripheral edge portion 17A of the second housing 17. In the temporary fixing part 40 (40A), temporary fixing is performed by welding or caulking, for example.

  (3) When the first and second housings 46 and 47 are substantially plate-like shapes arranged at both ends in the stacking direction P of the core portion, as in the housingless type oil cooler of the third embodiment, What is necessary is just to temporarily fix the outer peripheral part of the 1st, 2nd housings 46 and 47 and the outer peripheral part of the core part 14 along the lamination direction P in the part 40B.

Sectional drawing which shows the intermediate molded object of the oil cooler which concerns on 1st Example of this invention. The side view which shows the intermediate molded object of the said 1st Example. Sectional drawing which shows the oil cooler of the said 1st Example. The top view which shows the oil cooler of the said 1st Example. Sectional drawing of the oil cooler which concerns on 2nd Example of this invention. The bottom view of the oil cooler of the second embodiment. Sectional drawing of the housingless type oil cooler which concerns on 3rd Example of this invention. The side view of the oil cooler of the said 3rd Example. Explanatory drawing which shows the brazing procedure of the oil cooler which concerns on a comparative example.

Explanation of symbols

10, 10A, 10B ... Oil cooler (brazing member)
DESCRIPTION OF SYMBOLS 11 ... Intermediate molded object 12 ... Metal plate 14 ... Core part 16 ... 1st housing 16A ... Cylindrical part 16C ... Opening peripheral part 17 ... 2nd housing 17A ... Outer peripheral part 40, 40A, 40B ... Temporary fixing part 46 ... 1st Housing 47 ... second housing

Claims (4)

A plurality of plates having a brazing material layer on the surface are laminated, and the brazing material layer is melted by heating at the time of brazing, so that adjacent plates in the laminating direction are brazed together with a reduction in the dimension of the core in the laminating direction. A core part attached,
A metal first housing and a second housing larger than the plate sandwiching the core portion in the stacking direction;
Before brazing, the first and second housings are pressed in the laminating direction across the core part, and elastically deformed so as to bulge out convexly on the radial center side where the core part exists. the first projecting radially outward than the outer peripheral portion of the second housing, in a state of being elastically deformed to a proper size state after brazing respect the stacking direction, these first, outer peripheral portion of the second housing A temporary fixing part that fixes the other and restrains the relative position in the stacking direction ;
A brazing member comprising: The first housing has a substantially bottomed cylindrical shape having a cylindrical portion surrounding the outer periphery of the core portion,
The brazing member according to claim 1, wherein the temporary fixing portion is provided along a connecting portion between an opening peripheral edge portion of the cylindrical portion and an outer peripheral edge portion of the second housing. The first and second housings have a substantially plate shape disposed at both ends of the core portion in the stacking direction,
2. The brazing member according to claim 1, wherein in the temporary fixing portion, an outer peripheral portion of the first and second housings and an outer peripheral portion of the core portion are fixed along a stacking direction. A plurality of plates having a brazing material layer on the surface are laminated, and the brazing material layer is melted by heating at the time of brazing, so that adjacent plates in the laminating direction are brazed together with a reduction in the dimension of the core in the laminating direction. A core part attached,
A metal first housing and a second housing larger than the plate sandwiching the core portion in the stacking direction;
In a method of manufacturing a brazing member having
Before brazing , the first and second housings are pressed in the laminating direction across the core part, and elastically deformed so as to bulge out convexly on the radial center side where the core part exists. the first projecting radially outward than the outer peripheral portion of the second housing, in a state of being elastically deformed to a proper size state after brazing respect the stacking direction, these first, outer peripheral portion of the second housing Fixing each other, forming an intermediate molded body that restrains the relative position in the stacking direction ,
A method for producing a brazing member, characterized in that brazing is performed by heating the intermediate formed body.

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