JPH051890A - Core for housingless type oil cooler - Google Patents

Abstract

PURPOSE:To prevent the pitting of surfaces of plates, which form the passage of cooling water, by a method wherein the passage of cooling water is formed of a sacrifice corrosion layer on the inside of a first plate and another sacrifice corrosion layer on the inside of a second plate. CONSTITUTION:Second paltes 35 are arranged respectively between first plates 33 while a cooling water passage 89 is formed of a sacrifice corrosion layer 73 on the inside of the first plate 33 and another sacrifice corrosion layer 73 on the inside of the second plate 35. On the other hand, an oil passage 91 is formed of a brazing material layer 75 on the outside of a second plate 35, another brazing material layer 75 on the outside of the first plate 33 and the sacrifice corrosion layer 73 on the inside of the tubular sections 79, 81 of the first plate 33. Cooling water flows from a cooling water inflow pipe 45 into the inlet tank 40A of cooling water, then, passes through the cooling water passage holes 67 of the first plate 33 and the second plate 35 to fill respective cooling water passages 89, then, heat exchange is effected between oil in an oil passage 91 and flows out of an outflow tube. The pitting of the surfaces forming the flow passage of the cooling water can be prevented surely by the sacrifice corrosion layers 73.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil cooler core portion, and more particularly to a housingless oil cooler core portion formed by laminating plate members.

[0002]

2. Description of the Related Art Conventional housingless oil coolers formed by laminating plate members are disclosed, for example, in Japanese Utility Model Publication No. 62-125870 and Japanese Utility Model Publication No. 63-7497.
The one disclosed in Japanese Patent Publication No. 3 etc. is known.

FIG. 16 shows a housingless oil cooler of this type. The core portion 11 of the oil cooler is shown in FIG.
Is formed by stacking a first plate 13 and a second plate 15 made of stainless steel, for example.
The cooling water passages 17 and the oil passages 19 are alternately formed between the portions 15.

Since the core portion 11 of such a conventional housingless oil cooler has a large number of plates 13 and 15 made of stainless steel, the weight of the core portion 11 is very heavy, and the total weight of the automobile is reduced. From the aspect, it is desired to develop a lightweight core portion using, for example, an aluminum clad material.

[0005]

However, the core portion 11 of such a conventional housingless oil cooler is used.
However, there is a problem as described below when the is simply formed of an aluminum clad material.

That is, in the aluminum clad material used for such a purpose, as shown in FIG. 17, the sacrificial corrosion layer 23 is formed on one side of the core material 21, and the brazing material on the other side of the core material 21. The layer 25 is formed. When such a clad material is pressed, the first plate 13 and the second plate 15 shown in FIG. 18 are formed, and when these plates 13 and 15 are laminated, When the space X is used as a cooling water passage, the cooling water passage is formed by the sacrificial corrosion layer 23 inside the second plate 15 and the brazing material layer 25 outside the first plate 13, so that this cooling water passage is formed. In addition, for example, when the cooling water that corrodes the highly corrosive clad material is circulated, there is a problem that the brazing material layer 25 outside the first plate 13 causes pitting corrosion, and the holes easily penetrate the plate.

On the other hand, when the space Y is used as a cooling water passage, the cooling water passage is formed as a sacrificial corrosion layer 23 inside the first plate 13.
And the brazing material layer 25 on the outer side of the second plate 15, for example, when the cooling water that corrodes the highly corrosive clad material flows through this cooling water passage, There is a problem that the brazing material layer 25 causes pitting corrosion, and the holes easily penetrate the plate.

That is, in the core portion 11 of the conventional housingless oil cooler, the plates 13 and 15 are
When the plates 13 and 15 are arranged in consideration of the brazing, the brazing material layer 25 of one of the plates 13 and 15 is always located in the cooling water passage.
Causes a pitting corrosion and penetrates, resulting in a problem that the life is shortened.

Further, as shown in FIGS. 19 and 20,
Sacrificial corrosion layer 23 and brazing material layer 25 of the same foam type
In the plate formed by reversing, the sacrificial corrosion layer 23 side faces the fitting adhesive portion and cannot be joined.

The present invention has solved the above problems and provides a core portion of a housingless oil cooler capable of reliably preventing pitting corrosion on the surface of the plate which becomes the cooling water passage. To aim.

[0011]

A core portion of a housingless type oil cooler according to claim 1 is formed by laminating a plurality of plates and alternately forming cooling water passages and oil passages between these plates. In a core portion of a housingless oil cooler, the plate includes a first plate made of an aluminum clad material in which a sacrificial corrosion layer is formed on one side of the core material and a brazing material layer is formed on the other side of the core material. The second plate is composed of two types of plates, and the second plate is arranged between the first plate and the first plate.
A tubular portion is integrally formed on the outer peripheral edge of the plate body of the plate so that the inside is a sacrificial corrosion layer, and on the other hand, along the outer peripheral edge of the plate body of the second plate, the plate body side of the first plate The brazing material layer on the outside of the protrusion is brazed to the sacrificial corrosion layer on the inside of the tubular portion. is there.

The core portion of the housingless oil cooler of claim 2 is a housingless oil cooler in which a plurality of plates are laminated and cooling water passages and oil passages are alternately formed between these plates. In the core part,
The plate, a sacrificial corrosion layer is formed on one side of the core material,
It is composed of two types of plates, a first plate and a second plate, which are made of an aluminum clad material on which a brazing material layer is formed on the other side of the core material, and the second plate is arranged between the first plate and A tubular portion is integrally formed on the outer peripheral edge of the plate body of the first plate so that the inner side is the brazing material layer, while the plate of the first plate is formed along the outer peripheral edge of the plate body of the second plate. A protruding portion is integrally formed so as to protrude to the side opposite to the main body so that the inner side serves as a sacrificial corrosion layer, and the brazing material layer on the outer side of the protruding portion is brazed to the brazing material layer on the inner side of the tubular portion. It will be.

According to a third aspect of the present invention, in the core portion of the housingless oil cooler according to the first or second aspect, the cylindrical portion of the first plate has a large diameter portion on the opening end side and a small diameter portion on the plate body side. Is formed, and the large diameter portion is adjacent to the other first portion.
It is brazed to the small diameter portion of the plate in a fitted state.

The core portion of the housingless oil cooler of claim 4 forms an oil passage between the inner side of the first plate and the outer side of the second plate in the second aspect, and inner fins are provided in the oil passage. It accommodates

[0015]

In the core portion of the housingless oil cooler of claim 1, a cooling water passage is formed by the sacrificial corrosion layer inside the first plate and the sacrificial corrosion layer inside the second plate. An oil passage is formed by the outer brazing material layer and the outer brazing material layer of the second plate.

In the core portion of the housingless oil cooler of the second aspect, the oil passage is formed between the brazing material layer inside the first plate and the brazing material layer outside the second plate, and the oil passage of the first plate is formed. A cooling water passage is formed by the outer sacrificial corrosion layer and the inner sacrificial corrosion layer of the second plate.

According to a third aspect of the present invention, in the core portion of the housingless oil cooler according to the first or second aspect, the sacrificial corrosion layer inside the large diameter portion of the tubular portion of the first plate is adjacent to the other first plate. Is fitted and fixed to the brazing material layer on the outside of the small-diameter portion of, and brazed in this state.

In the core portion of the housingless oil cooler according to the fourth aspect, the inner fins are housed in the oil passage to improve the heat exchange efficiency.

[0019]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an enlarged view showing details of the B part of FIG.
2 is an enlarged view showing details of the C portion of FIG. 3, and FIG. 3 shows a housingless oil cooler in which an embodiment of the core portion of the housingless oil cooler of the present invention is arranged.
FIG. 4 is a vertical sectional view taken along line II-III, FIG. 4 is an exploded perspective view of FIG. 3, and FIG. 5 is a sectional view showing a state where the housingless oil cooler of FIG. 3 is attached to an engine.

3 to 5, reference numeral 31 indicates a core portion formed by alternately stacking first plates 33 and second plates 35. An upper casing 37 made of aluminum clad with a brazing material on the inner surface and a lower casing 39 clad with a brazing material on the outer surface are arranged on the upper portion of the core portion 31. Is formed,
The upper and lower casings 37 and 39 and the first plate 33 form a cooling water inlet tank 40A and an outlet tank 40B.

A cooling water passage hole 67 of the first plate 33 is formed in each of the inlet tank 40A and the outlet tank 40B. A through hole 42 is formed in the center of the upper casing 37, and a through hole 43 is formed in the center of the lower casing 39.
An oil passage hole 69 of the first plate 33 is formed near the through hole 43, and another oil passage hole 69 of the first plate 33 is closed by the lower surface of the lower casing 39.

A cooling water inflow pipe 45 for inflowing cooling water and a cooling water outflow pipe 47 for outflowing the cooling water are opened in the upper casing 37. On the other hand, below the core portion 31, a lower plate 49 made of aluminum whose upper surface is clad with a brazing material, a reinforcing plate 51 having a brazing material clad on its upper surface, and a mounting plate 53 having a brazing material clad on its upper surface.
Are sequentially arranged, and these plates have through holes 55,
56 and 57 are formed.

On the side of the through holes 55, 56 and 57, an oil inflow hole 59 is formed which opens one oil passage hole 69 of the second plate 35, and the other oil of the second plate 35 is oil. The passage hole 69 is closed by the lower plate 49.

Further, the cooling water passage holes 67, 67 of the second plate 35 are also closed by the lower plate 49. Also,
A packing 97 is attached to the lower portion of the attachment plate 53.

Further, through holes 61 and 63 are respectively formed in the centers of the first plate 33 and the second plate 35 forming the core portion 31, and the through holes 61 and 63 are formed in the through holes 61 and 63 as shown in FIG. A core part reinforcing tube 65 made of aluminum with a brazing material clad is inserted through the outside.

As shown in FIG. 5, an oil return pipe 62A made of, for example, a stud bolt and fixed to a bracket 60A of the engine and forming an oil outflow passage is inserted into the core reinforcing pipe 65.

A screw portion 66A is formed on the oil return pipe 62A, and a nut 66B is formed on the screw portion 66A.
The core portion 31 is fixed by screwing. Four through holes are formed in the first plate 33 and the second plate 35 at an angle (for example, 90 degrees) from the center, and two opposing through holes serve as cooling water passage holes 67. The two through holes facing each other are the oil passage holes 69.

A second space is provided between the first plates 33.
The plate 35 is arranged, and the first plate 3
3 and the plate bodies 77 and 83 of the second plate 35 have projections 34 and 3 for improving heat exchange efficiency, respectively.
A large number of 6 are formed to project.

However, 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
As shown in FIG. 6, a core material (for example, JIS3003) 7
1 to one side of the sacrificial corrosion layer 73 (for example, JIS7072,
5005), and a brazing material layer (for example, JI) on the other side.
S4343, 4045) 75 are formed.

Cylindrical portions 79 and 81 are integrally formed on the outer peripheral edge of the plate body 77 of the first plate 33 and the edge of the through hole so that the sacrificial corrosion layer 73 is formed inside. on the other hand,
Along the outer peripheral edge of the plate body 83 of the second plate 35 and the edge of the through hole, the plate body 77 of the first plate 33 is formed.
The protruding portions 85 and 87 are integrally formed so as to protrude to the side and have the sacrificial corrosion layer 73 inside.

Then, as shown in FIGS. 1 to 3, the brazing material layer 75 on the outer side of the projecting portions 85, 87 of the second plate 35 is on the inner side of the cylindrical portions 79, 81 of the first plate 33. The sacrificial corrosion layer 73 is brazed.

Sacrificial corrosion layer 73 inside the first plate 33
And a sacrificial corrosion layer 73 inside the second plate 35 form a cooling water passage 89, and a brazing material layer 75 outside the second plate 35, a brazing material layer 75 outside the first plate 33, and An oil passage 91 is formed by the sacrificial corrosion layer 73 inside the tubular portions 79 and 81 of the first plate 33.

Also, in this embodiment, the first plate 33
The large diameter portion 93 is formed on the open end side of the cylindrical portion 79 and the small diameter portion 95 is formed on the plate body 77 side. And
The large diameter portion 93 of the upper first plate 33 is brazed to the small diameter portion 95 of the adjacent lower first plate 33 in a fitted state.

In the housingless oil cooler described above, non-corrosive flux is applied to each component in advance and dried, and then the tubular portions 79, 81 of the first plate 33.
, The projections 85 and 87 of the second plate 35 are fitted to each other, and the large diameter portion 93 of the first plate 33 is fitted to the small diameter portion 95 of the other first plate 33.
After the core portion reinforcing pipe 65 is inserted into the through holes 61 and 63 at the center of 35 to form the core portion 31, the upper and lower casings 37 and 3 are formed.
9, the lower plate 49, the reinforcing plate 51, the mounting plate 53, etc. are attached, these are heated in a furnace, and each component is brazed.

In the housingless oil cooler described above, the cooling water flows into the cooling water inlet tank 40A from the cooling water inflow pipe 45 at the upper portion of the core portion 31, and then the first plate 33 and the second plate 35. After filling each cooling water passage 89 through the cooling water passage hole 67, heat is exchanged with the oil in the oil passage 91, and the cooling water outlet tank 4 is provided.
It flows out from the cooling water outflow pipe 47 of 0B.

On the other hand, as shown in FIG. 5, oil flows from the engine-side oil inlet passage 60B through the oil inlet hole 59 in the lower portion of the core portion 31 into the core portion 31, and then the oil passage hole 69. After filling each oil passage 91, the heat is exchanged with the cooling water in the cooling water passage 89, the heat flows into the oil outlet tank 38A, and the oil is purified by the oil filter 64A arranged above the oil outlet tank 38A. After that, the oil passes through the oil return pipe 62A and flows out from the oil outlet passage 62B to the engine side.

Thus, in the core portion of the housingless oil cooler configured as described above, the plate has the sacrificial corrosion layer 73 formed on one side of the core material 71 and the brazing material on the other side of the core material 71. First plate 33 and second plate 35 made of an aluminum clad material on which the layer 75 is formed
The second plate 35 is arranged between the first plates 33, and the outer peripheral edge of the plate body 77 of the first plate 33 has a cylindrical shape so that the inner side becomes the sacrificial corrosion layer 73. The part 79 is integrally formed, while the second part
Along the outer peripheral edge of the plate body 83 of the plate 35, a protruding portion 85 is integrally formed so as to protrude toward the plate body 77 side of the first plate 33 and the sacrificial corrosion layer 73 is formed inside.
The brazing material layer 75 on the outside of the protruding portion 85 is attached to the tubular portion 7
9 is brazed to the sacrificial corrosion layer 73 on the inner side, the cooling water passage 89 is formed by the sacrificial corrosion layer 73 inside the first plate 33 and the sacrificial corrosion layer 73 inside the second plate 35.
Is formed, the cooling water passage 8 of the plates 33 and 35 is formed.
It is possible to reliably prevent pitting corrosion on the surface of No. 9.

In this embodiment, the cooling water tank 4
The brazing material layer 75 side of the first plate 33 is located on the 0A and 40B sides, but the first passage is the cooling water passage 89.
Therefore, there is no problem even if pitting corrosion occurs in the first plate 33.

In the core portion of the housingless oil cooler described above, the large diameter portion 93 is formed on the opening end side of the tubular portion 79 of the first plate 33, and the small diameter portion 95 is formed on the plate body 77 side. One large diameter portion 93 of the first plate 33
Is fitted to the small-diameter portion 95 of another adjacent first plate 33, it is possible to reliably assemble the first plate 33 and the second plate 35 before brazing, and after brazing. It is possible to improve the product accuracy of.

7 to 10 show another embodiment of the present invention. In these figures, reference numeral 131 is formed by alternately stacking first plates 133 and second plates 135. It shows the core part.

A tank portion 141 is formed above the core portion 131 by an upper casing 137 and a lower casing 139 made of aluminum. Upper casing 1
Through holes 142, 143, and 144 are formed in the centers of the lower casing 37 and the lower casing 139, and the upper casing 137 has a cooling water inlet pipe 1 through which cooling water flows.
45 and a cooling water outflow pipe 147 for flowing out the cooling water are opened.

On the other hand, below the core portion 131, a lower plate 149 made of aluminum, a reinforcing plate 151, and a mounting plate 1 are provided.
53 are sequentially arranged. Further, through holes 161 and 163 are formed in the centers of the first plate 133 and the second plate 135 forming the core portion 131, respectively.
A core reinforcement tube 165 made of aluminum is inserted into the through holes 161 and 163.

Further, four through holes are formed in the first plate 133 and the second plate 135 at an angle (for example, 90 degrees) from the center, and two opposing through holes are cooling water passage holes. 167, and the other two through holes facing each other are the oil passage holes 169.

The second plates 135 are disposed between the first plates 133, and the plate body 183 of the second plate 135 is formed with a large number of protrusions 134 for improving heat exchange efficiency. Has been done.

However, in this embodiment, the first plate 133 and the second plate 135 are formed by press-molding a clad material made of aluminum, and the clad material is made of a core material (for example, as shown in FIG. 11). , JIS300
3) The sacrificial corrosion layer 173 (for example, JIS
7072, 5005, etc.) and a brazing material layer (for example, JIS4343, 4045) 175 is formed on the other side.

The plate body 177 of the first plate 133
The outer side is the sacrificial corrosion layer 1 on the outer peripheral edge and the through hole edge.
Cylindrical parts 179 and 181 are integrally formed so as to be 73.

On the other hand, along the outer peripheral edge of the plate main body 183 of the second plate 135 and the edge of the through hole, the first plate 133 protrudes to the side opposite to the plate main body 177, and the inner side serves as the sacrificial corrosion layer 173. 185 and 187 are integrally formed.

Then, the protruding portion 18 of the second plate 135
5, the brazing material layer 175 on the outer side of the first plate 133 is brazed to the brazing material layer 175 on the inner side of the tubular portions 179, 181 of the first plate 133, and the brazing material layer 175 on the inner side of the first plate 133. And the brazing material layer 175 on the outer side of the second plate 135 form an oil passage 189, and the sacrificial corrosion layer 173 on the inner side of the second plate 135 and the sacrificial corrosion layer 173 on the outer side of the first plate 133 cool. A water passage 191 is formed.

The inner fin 190 made of aluminum is brazed in the oil passage 189. Further, in this embodiment, the first plate 13
The cylindrical portion 179 of No. 3 has a large diameter portion 193 on the opening end side.
A small diameter portion 195 is formed on the plate body 177 side.

The large diameter portion 193 of the upper first plate 133 is brazed to the small diameter portion 195 of the adjacent lower first plate 133 in a fitted state. In the housingless oil cooler described above, the cooling water is the core portion 1
After flowing into the tank part 141 from the cooling water inflow pipe 145 above the first plate 133, the first plate 133 and the second plate 1
35 cooling water passage holes 167, and each cooling water passage 191.
After being filled with water, the heat is exchanged with the oil in the oil passage 189, and the oil flows out from the cooling water outflow pipe 47 of the tank 141.

On the other hand, the oil flows into the core portion 131 from the oil inflow hole 159 in the lower portion of the core portion 131, passes through the oil passage hole 169, fills the oil passage 189, and then the cooling water in the cooling water passage 191. After being heat-exchanged with each other and flowing into the inside of the tank part 141 and being purified by, for example, an oil filter (not shown) arranged above the tank part 141, the oil outflow passage formed inside the core reinforcing pipe 165 is It leaks outside the street.

In the housingless oil cooler described above, non-corrosive flux is applied to each component in advance, and the flux is dried, and then the inner fins 190 are provided in the tubular portions 179 and 181 of the first plate 133. After accommodating the first plate 133, the protrusions 185 and 187 of the second plate 135 are fitted to the first plate 133, and the large diameter portion 193 of the first plate 133 is fitted to the small diameter portion 195 of the other first plate 133. After the oil outflow pipe 165 is inserted into the through holes 161 and 163 at the center of the plates 133 and 135 to form the core portion 131, the upper and lower casings 13
7, 139, lower plate 149, reinforcing plate 151, mounting plate 1
It is manufactured by attaching 53 etc., heating these in a furnace, and brazing each part.

Thus, in the core portion of the housing-less type oil cooler configured as described above, the sacrificial corrosion layer 173 is formed on one side of the core member 171 to form the core member 1.
The first plate 133 and the second plate 135 are made of an aluminum clad material on which the brazing material layer 175 is formed on the other side of 71, and the second plate 135 is arranged between the first plates 133. In addition, the tubular portion 179 is integrally formed on the outer peripheral edge of the plate body 177 of the first plate 133 so that the brazing filler metal layer 175 is formed on the inner side thereof, while the outer peripheral edge of the plate body 183 of the second plate 135 is formed along the outer peripheral edge. And the inner side of the sacrificial corrosion layer 17 protrudes to the side opposite to the plate body 177 of the first plate 133.
Since the protruding portion 185 is integrally formed so as to be 3 and the brazing material layer 175 on the outer side of the protruding portion 185 is brazed to the brazing material layer 175 on the inner side of the cylindrical portion 179, the plates 133, 135 Pitting on the surface that becomes the cooling water passage 191 can be reliably prevented.

That is, in the core portion of the housingless oil cooler of this embodiment, the cooling water passage 191 is formed by the sacrificial corrosion layer 173 outside the first plate 133 and the sacrificial corrosion layer 173 inside the second plate 135. Since it is formed, it is possible to reliably prevent pitting corrosion on the surfaces of the plates 133 and 135 that become the cooling water passages 191.

Further, in the core portion of the housingless oil cooler of this embodiment, the brazing material layer 175 inside the first plate 133 and the brazing material layer 1 outside the second plate 135.
Since the oil passage 189 is formed between the inner fin 190 and the inner fin 190, the inner fin 190 is accommodated in the oil passage 189, so that the inner fin 190 can be accommodated in the oil passage 189 without lowering the assembling property. .

Further, in the core portion of the housingless oil cooler of this embodiment, the large diameter portion 193 is provided on the opening end side of the tubular portion 179 of the first plate 133, and the plate body 1 is provided.
The small diameter portion 195 is formed on the 77 side, and the first plate 1 on one side is formed.
The large diameter portion 193 of 33 is attached to another adjacent first plate 13
Since the first plate 133 before the brazing and the second plate 135 before the brazing can be reliably assembled, the product accuracy after the brazing can be improved. Becomes

Further, in the core portion of the housingless oil cooler of this embodiment, the brazing material layer 175 inside the first plate 133 and the brazing material layer 1 outside the second plate 135.
Since an oil passage 189 is formed between the inner fin 190 and the inner fin 190, the inner fin 190 made of aluminum is easily and surely brazed to the first plate 133 and the second plate 135. It becomes possible to do.

12 and 13 show another embodiment of the present invention, in which the present invention is applied to an oil cooler for an automatic transmission. In the figure, reference numeral 241 indicates a rectangular core portion formed by laminating a plurality of aluminum plates.

In the core portion 241, the oil inflow side stud bolt 243 into which the oil from the automatic transmission flows in and the oil flow out to the automatic transmission at predetermined intervals on the center line in the long axis direction. The oil outflow side stud bolt 245 is inserted.

The core portion 241 is fixed to a housing (not shown) of the automatic transmission by these stud bolts 243 and 245. Plate-side oil passages 249 and 251 are formed at diagonal corners of the core portion 241.

These plate side oil passages 249, 2
Reference numeral 51 denotes an oil inflow side stud bolt 243 and an oil outflow side stud bolt 2 via oil tank portions 253 and 255 formed to project to the front side of the core portion 241.
45 are communicated with each other.

In this embodiment, the cooling water inflow pipe 257 and the cooling water outflow pipe 259 are connected to the other diagonal corners of the core portion 241. Core part 24
1 includes a first plate 261 and a second plate 261 as shown in FIG.
It is formed by alternately stacking the plates 263.

First plate 261 and second plate 263
Is made of an aluminum clad material on which a brazing material layer and a sacrificial corrosion layer are formed, like the first plate and the second plate shown in FIG. 1. The configuration of the first plate 261 and the second plate 263 is It is almost the same as the core portion shown in FIG.

A cooling water passage 265 and an oil passage 26 are provided between the first plate 261 and the second plate 263.
7 are formed. A protrusion 269 protruding inward is formed on the first plate 261, and an inner fin 271 is housed in the oil passage 267.
The heat exchange efficiency is improved.

Also in the core portion of the oil cooler for an automatic transmission constructed as described above, it is possible to obtain substantially the same effect as that of the embodiment shown in FIG. In this embodiment, the first plate and the second plate may of course have the same configuration as that of the first plate and the second plate shown in FIG.

Further, in this embodiment, the oil passage 2
Instead of accommodating the inner fin 271 in 67, FIG.
As shown in FIG. 5, the second plate 263 may be formed with a protrusion 273 protruding outward.

In the above-mentioned embodiment, the core portion is formed in a circular shape or a quadrangular shape, but the present invention is not limited to such an embodiment. Of course, it is also good.

Further, it goes without saying that the cooling water tank may be arranged below the core portion and the oil inlet may be arranged above the core portion.

[0069]

As described above, in the core portion of the housingless oil cooler according to the first aspect, the sacrificial corrosion layer inside the first plate and the sacrificial corrosion layer inside the second plate make the cooling water passage. As a result, the pitting corrosion of the surface of the plate that becomes the cooling water passage can be reliably prevented.

In the core portion of the housingless oil cooler of the second aspect, since the cooling water passage is formed by the sacrificial corrosion layer on the outer side of the first plate and the sacrificial corrosion layer on the inner side of the second plate, It is possible to reliably prevent pitting corrosion on the surface serving as the cooling water passage.

In the core portion of the housingless oil cooler according to the third aspect, the first plate and the second plate before brazing can be reliably assembled, and the product accuracy after brazing can be improved. it can.

In the core portion of the housingless oil cooler of the fourth aspect, there is an advantage that the inner fin can be housed in the oil passage without lowering the assembling property.

[Brief description of drawings]

FIG. 1 is an enlarged view showing details of section B in FIG. 3;

FIG. 2 is an enlarged view showing details of section C in FIG.

FIG. 3 is a vertical cross-sectional view taken along line III-III of FIG. 4 showing a housingless oil cooler having an embodiment of the core portion of the housingless oil cooler of the present invention.

FIG. 4 is an exploded perspective view showing the housingless oil cooler of FIG.

5 is a cross-sectional view showing a state in which the housingless oil cooler of FIG. 3 is attached to an engine.

FIG. 6 is an enlarged cross-sectional view showing a clad material forming the first plate and the second plate of FIG.

7 is a vertical cross-sectional view showing details of a VII portion in FIG.

8 is a vertical cross-sectional view taken along line VIII-VIII in FIG. 10 showing a housingless oil cooler having an embodiment of the core portion of the housingless oil cooler of the present invention.

9 is an exploded perspective view showing a core portion of the housingless oil cooler of FIG. 8. FIG.

10 is a top view showing the housingless oil cooler of FIG. 8. FIG.

FIG. 11 is an enlarged cross-sectional view showing a clad material forming the first plate and the second plate of FIG.

FIG. 12 is a top view showing an embodiment in which the present invention is applied to an oil gear for an automatic transmission.

13 is a cross-sectional view of FIG.

FIG. 14 is a cross-sectional view showing details of a main part of FIG.

FIG. 15 is a top view showing another embodiment in which the present invention is applied to an oil gear for an automatic transmission.

FIG. 16 is a vertical cross-sectional view showing a conventional housingless oil cooler.

FIG. 17 is an explanatory diagram showing an aluminum clad material.

FIG. 18 is a vertical cross-sectional view showing an enlarged part A when the core part of the housingless oil cooler of FIG. 16 is formed of an aluminum clad material.

FIG. 19 is a vertical cross-sectional view showing, in an enlarged manner, another example of the portion A when the core portion of the housingless oil cooler of FIG. 16 is formed of an aluminum clad material.

FIG. 20 is an enlarged vertical cross-sectional view showing still another example of the portion A when the core portion of the housingless oil cooler of FIG. 16 is formed of an aluminum clad material.

[Explanation of symbols]

31,131 Core part 33,133 1st plate 35,135 Second plate 71,171 core material 73,173 Sacrificial corrosion layer 75,175 brazing material layer 77,83,177,183 Plate body 79,179 Cylindrical part 85,185 protrusion 89,189 Cooling water passage 91,191 oil passage 93,193 Large diameter part 95,195 Small diameter part 190 Inner fin

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hiroyuki Yoshida             Carso 5-24-15 Minamidai, Nakano-ku, Tokyo             Inside Nikku Co., Ltd.

Claims (4)

[Claims] 1. A housingless structure in which a plurality of plates (33, 35) are laminated, and cooling water passages (89) and oil passages (91) are alternately formed between these plates (33, 35). In the core portion of the expression type oil cooler, the plate (33, 35) has a sacrificial corrosion layer (73) formed on one side of the core material (71) and a brazing material layer (75) on the other side of the core material (71). ) Formed of an aluminum clad material and a second plate (3)
5) two types of plates (33, 35), the second plate (35) is arranged between the first plates (33), and the plate body (77) of the first plate (33) is A cylindrical part (79) is integrally formed on the outer peripheral edge so that the inner side becomes the sacrificial corrosion layer (73), while the second part is formed.
Along the outer peripheral edge of the plate body (83) of the plate (35), the plate body (7) of the first plate (33) is provided.
7), the protrusion (85) is integrally formed so that the sacrificial corrosion layer (73) is formed on the inside, and the brazing material layer (75) on the outside of the protrusion (85) is formed on the tubular portion. A core portion of a housingless oil cooler characterized by being brazed to a sacrificial corrosion layer (73) which is the inside of (79). 2. A housingless structure in which a plurality of plates (133, 135) are laminated, and cooling water passages (191) and oil passages (189) are alternately formed between these plates (133, 135). In the core of the oil cooler, the plate (133, 135) is connected to the core (1
71), a sacrificial corrosion layer (173) is formed on one side, and a brazing material layer (175) is formed on the other side of the core material (171).
3) and the second plate (135), two types of plates (133, 135), and the first plate (13
The second plate (135) is arranged between the first plate (133) and the plate body (17) of the first plate (133).
A tubular part (179) is integrally formed on the outer peripheral edge of the second plate (135) so that the brazing filler metal layer (175) is formed on the inner side of the outer peripheral edge of the plate body (183). The plate body (1) of the first plate (133).
77) and the sacrificial corrosion layer on the inside (173)
So that the brazing material layer (175) on the outer side of the protruding portion (185) is formed on the brazing material layer (175) on the inner side of the tubular portion (179). The core part of a housingless oil cooler characterized by being brazed. 3. The cylindrical portion (79, 179) of the first plate (33, 133) has a large diameter portion (93, 1) on the opening end side.
93), the small diameter portion (95, 195) is formed on the plate body (77, 177) side, and the large diameter portion (93, 19).
The housingless oil according to claim 1 or 2, wherein 3) is brazed to the small diameter portion (95, 195) of another adjacent first plate (33, 133) in a fitted state. Core part of the cooler. 4. An oil passage (189) between the inside of the first plate (133) and the outside of the second plate (135).
The inner fin (190) is housed in the oil passage (189).
The core part of the described housingless oil cooler.