JPH0487726A - Manufacture for core part of housingless type oil cooler - Google Patents

Abstract

PURPOSE:To fix plates to a circulating pipe and mutually braze the plates under this condition so as to thoroughly ensure the accuracy of a product after soldering by forming the plates and the circulating pipe with aluminum, and also, after the circulating pipe is inserted into a through hole, expanding the circulating pipe outward. CONSTITUTION:A circulating pipe (oil outflow pipe) 65 consisting of aluminium is inserted into through holes of plate 33 and 35 consisting of aluminum. And then, the circulating pipe 65 is expanded outward by bulging process. Thereby, the respective plates 33 and 35 are fixed to the circulating pipe 65 to matually braze the plates 33 and 35 under this condition, and thus the core part 31 of a housingless type oil cooler is formed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method of manufacturing a core part of an oil cooler,
In particular, the present invention relates to a method of manufacturing a core portion of a housingless oil cooler formed by laminating plate members.

[Conventional technology]

Conventionally, as a housingless type oil cooler formed by laminating plate members, for example,
Those disclosed in Japanese Utility Model Publication No. 5870, Japanese Utility Model Application Publication No. 63-74973, etc. are known.

FIG. 5 shows this type of housingless oil cooler, and the core part 11 of this oil cooler is, for example,
It is constructed by stacking a first plate 13 and a second plate 15 made of stainless steel, and forming cooling water passages 17 and oil passages 19 alternately between these plates X3 and 15.

However, since the core part 11 of such a conventional housingless type oil cooler is made up of a large number of laminated plates 13, 15 made of stainless steel, its weight becomes very heavy, and from the viewpoint of overall weight reduction of the automobile, For example, it is desired to develop a lightweight core using an aluminum cladding material.

[Problem to be solved by the invention]

However, when forming the core part 11 of such a conventional housing-less oil cooler from an aluminum clad material, there is a problem in that brazing may make it difficult to ensure sufficient accuracy in the subsequent product. be.

That is, to manufacture such an aluminum oil cooler, for example, after assembling the plates 13, 15, etc., apply non-corrosive flux to this, dry it, and heat it in a furnace. However, the relative positional relationship of each part may be distorted during transportation or heating in a furnace, etc., and brazing may be difficult. There is a risk that it will be difficult to ensure product accuracy.

The present invention solves the above-mentioned problems, and an object of the present invention is to provide a method for manufacturing a core portion of a housingless oil cooler, which can sufficiently ensure product accuracy after brazing.

[Means to solve the problem]

The method for manufacturing the core part of a housingless oil cooler according to the present invention includes stacking a plurality of plates each having a through hole formed in the center, and alternately forming cooling water passages and oil passages between these plates. In the method for manufacturing a core part of a housingless oil cooler, the core part of a housingless oil cooler is formed by inserting a distribution pipe for circulating oil into the through hole, wherein the plate and the distribution pipe are formed of aluminum, and the distribution pipe is inserted into the through hole. After fitting, the plate is fixed to the circulation pipe by expanding the circulation pipe outward, and in this state, the plates are brazed to each other. In a method for manufacturing a core part of a housingless oil cooler, a distribution pipe made of aluminum is inserted into a through hole of a plate made of aluminum, and then the distribution pipe is expanded outward by, for example, bulge processing.
This fixes each plate to the flow pipe, and in this state the plates are brazed to each other.

〔Example〕

Hereinafter, the details of the method of the present invention will be explained with reference to the drawings and an embodiment thereof.

FIG. 1 is a longitudinal cross-sectional view showing a housing-less oil cooler manufactured by an embodiment of the method for manufacturing a core part of a housing-less oil cooler of the present invention, and FIG. 2 is an exploded perspective view of FIG. 1. FIG. 3 is a longitudinal sectional view showing details of section B in FIG. 1.

In FIGS. 1 and 2, reference numeral 31 indicates a core portion formed by alternately stacking first plates 33 and second plates 35.

At the top of this core part 31 is a tank part 41 made up of an upper casing 37 and a lower casing 39 made of aluminum.
is formed.

Through holes 42, 43, and 44 are formed in the centers of the upper casing 37 and the lower casing 39, respectively, and
A cooling water inflow pipe 45 through which cooling water flows in, and a cooling water outflow pipe 47 through which cooling water flows out are opened in the upper casing 37 .

On the other hand, below the core part 31, a lower plate 49 made of aluminum is provided. Reinforcement plate 51. For installation, the plates 53 are arranged in sequence,
Through holes 55, 56, 57 are formed in the center of these plates, and oil inlet holes 59 are formed on both sides of the through holes 55, 56, 57.

Furthermore, through holes 61.6 are provided in the centers of the first plate 33 and the second plate 35 that form the core portion 31, respectively.
3 is formed, and in these through holes 61 and 63, an oil outflow pipe 6 made of aluminum and forming an oil outflow passage is formed.
5 is inserted.

Moreover, the first plate 33 and the second plate 35 include
Four through holes are formed at an angle (for example, 90 degrees) from the center, and two opposing through holes are the cooling water passage holes 67.
The other two opposing through holes are oil passage holes 69.
It is said that

A second plate 35 is provided between each of the first plates 33.
are arranged, and the first plate 33 and the second plate 33 are arranged.
A large number of protrusions 34 and 36 are formed on the plate body 77 and 83 of the plate 33 to improve heat exchange efficiency.

In this embodiment, the first plate 33 and the second plate 35 are formed by press-molding a clad material made of aluminum, and the clad material is a core material (for example, JIS 3003) as shown in FIG. ) 71 is formed with sacrificial corrosion N73 (e.g., JIS7072.5005, etc.), and the other side is formed with a brazing metal layer (e.g., JIS4343).
．． 4045) 75.

A cylindrical portion 79.81 is integrally formed on the outer peripheral edge of the plate main body 77 of the first plate 33 and the edge of the through hole so that the sacrificial corrosion layer 73 is formed on the inside.

On the other hand, protrusions 85 and 87 are integrally formed along the outer peripheral edge of the plate body 83 of the second plate 35 and the edge of the through hole, protruding toward the plate body 77 side of the first plate 33, and forming the sacrificial corrosion layer 73 on the inside. It is formed.

As shown in FIGS. 1 and 3, the brazing material layer 75 on the outside of the protrusion 85. It is brazed to the corrosion layer 73 and the first plate 33
A cooling water passage 89 is formed by the sacrificial corrosion layer 73 inside the second plate 35 and the sacrificial corrosion layer 73 inside the second plate 35 . Brazing material layer 75. and first plate 3
An oil passage 91 is formed by the sacrificial corrosion layer 73 inside the cylindrical portion 79 and 81 of No. 3.

Further, in this embodiment, the cylindrical portion 79 of the first plate 33
A large diameter portion 93 is formed on the open end side, and a small diameter portion 95 is formed on the plate main body 77 side.

The large diameter portion 93 of the upper first plate 33 is fitted and brazed to the small diameter portion 95 of the adjacent lower first plate 33.

In the housingless type oil cooler configured as described above, the cooling water is supplied to the cooling water inlet pipe 45 at the upper part of the core part 31.
After flowing into the tank part 41 from the oil passage, it passes through the cooling water passage holes 67 of the first plate 33 and the second plate 35 and fills each cooling water passage 89, and then heat exchanges with the oil in the oil passage 91, and the oil flows into the tank part. The cooling water flows out from the cooling water outflow pipe 47 of 41.

On the other hand, the oil flows through the oil inflow hole 59 at the bottom of the core part 31.
After flowing into the core part 31 through the oil passage hole 67 and filling the oil passage 91, heat is exchanged with the cooling water in the cooling water passage 89, and flows into the tank part 41. After being purified by an oil filter (not shown) disposed above the oil filter 41, the oil flows out through an oil outflow pipe 65.

The housing-less oil cooler configured as described above is manufactured as described below using an embodiment of the method for manufacturing the core portion of a housing-less oil cooler of the present invention.

That is, first, the protruding portions 85.87 of the second plate 35 are fitted into the cylindrical portions 79.8 of the first plate 33, and
After this, the large diameter portion 93 of the first plate 33 is fitted into the small diameter portion 95 of the other first plate 33.

After this, play) 33.Through hole 61 in the center of 35
．． An oil outflow pipe 65, which is a distribution pipe, is fitted into 63.

Then, for example, by hydraulic bulging, the oil outflow pipe 65, which is a distribution pipe, is expanded outward, whereby each plate 33, 35 is firmly fixed to the oil outflow pipe 65, and the core part 31 is formed. be done.

In this hydraulic bulging process, since the oil outflow pipe 65, which is a flow pipe, is formed of aluminum, it can be easily expanded at a relatively low pressure.

After this, upper and lower casings 37° 39, lower plate 49. Reinforcement plate 51. For attachment, a plate 53 or the like is attached. A non-corrosive flux is then applied to this.
This is dried, then heated in a furnace,
Each part is brazed and the product is manufactured.

Therefore, in the method for manufacturing the core portion of a housingless type oil cooler as described above, the plates 33, 35 and the oil outflow pipe 65, which is a distribution pipe, are formed of aluminum, and the oil outflow pipe 65 is made of aluminum.
．． After fitting into the through hole 61.63 at the center of the oil outflow pipe 65, the plate 33.35 is fixed to the oil outflow pipe 65 by expanding the oil outflow pipe 65 outward. Since the core part 31 is assembled by brazing with each other, the relative positional relationship of each part will not be disturbed during later transportation or heating in a furnace, and brazing can be done later. It becomes possible to ensure sufficient product accuracy.

In addition, in the embodiment described above, an example was described in which the oil outflow pipe 65, which is a distribution pipe, was expanded by bulge processing, but the present invention is not limited to such an embodiment, and for example, a pipe expansion jig, etc. It goes without saying that the tube may be expanded by mechanical means.

In addition, in the above embodiment, the case where the core part 31 is firmly fixed by expanding the oil outflow pipe 65 has been described. After assembling the plates 53 and the like at the same time, all parts can be firmly fixed by expanding the oil outflow pipe 65.7 After that, the mutually contacting parts can be brazed in a furnace. In the case of , 2, the relative positional relationship of each part will not be disturbed during subsequent transportation, heating in a furnace, etc., and brazing can sufficiently ensure the accuracy of the subsequent product.

〔Effect of the invention〕

As described above, in the method for manufacturing the core part of the housingless oil cooler of the present invention, the plate and the distribution pipe are formed of aluminum, and after the distribution pipe is inserted into the through hole, the distribution pipe is expanded outward. By doing this, the plates are fixed to this distribution pipe, and the plates are brazed to each other in this state, so the assembly of the core part can be done later during transportation or heating in the furnace, etc. Brazing has the advantage that the relative positional relationship of each part will not be disturbed, and that subsequent product accuracy can be sufficiently ensured.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view taken along line II-II in FIG. 2, showing a housing-less oil cooler manufactured using an embodiment of the method for manufacturing a core portion of a housing-less oil cooler according to the present invention. . FIG. 2 is an exploded perspective view of the housing-less oil cooler shown in FIG. 1. FIG. 3 is a longitudinal sectional view showing details of section B in FIG. 1. FIG. 4 is an enlarged cross-sectional view of the cladding material forming the first plate and second plate of FIG. FIG. 5 is a longitudinal sectional view showing a conventional housingless oil cooler. [Explanation of symbols of main parts] 31...Core part 33...First plate 35...Second plate 65...Oil outflow pipe (distribution pipe) 89...Cooling water passage 91...・Oil passage. Figure Figure Figure Figure

Claims (1)

[Claims] (1) A plurality of plates with a through hole formed in the center are stacked, cooling water passages and oil passages are alternately formed between these plates, and a distribution pipe for flowing oil is installed in the through hole. In the method of manufacturing a core part of a housing-less type oil cooler by inserting the core part, the plate and the distribution pipe are formed of aluminum, and the steps include:
After inserting the distribution pipe into the through hole, by expanding the distribution pipe outward, the distribution pipe has the following properties:
A method of manufacturing a core portion of a housingless oil cooler, comprising fixing the plates and brazing the plates to each other in this state.