JPH09210578A - Core section of housing-less type oil cooler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the extremity end surface of a dimple projected from a plate to a cooling water passage to be positively brazed against an opposing plate by a method wherein a brazing material layer is formed outside sacrifying corrosion layers in the first plate and the second plate at a core section and the extremity end surface of the dimple is brazed to either the second or the first plate. SOLUTION: A first plate 33 and a second plate 35 are alternatively laminated up to form a core section. A cooling water passage 89 and an oil passage 91 are alternatively formed between the first plate 33 and the second plate 35 and at the same time the first plate 33 and the second plate 35 facing against a sacrifying corrosion layer 73 are oppositely faced against a cooling water passage 89, and then either the first plate 33 or the second plate 35 is formed with a dimple 34 projected toward the cooling water passage 89. Then, the extremity end surface of the dimple 34 projected from the first plate 33 to the cooling water passage 89 is brazed to the second plate 35 by a brazing material layer 74 formed outside the sacrifying corrosion layer 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 Conventionally, as a core portion of a housingless oil cooler formed by laminating plate members, one disclosed in, for example, Japanese Patent Application Laid-Open No. 5-1890 is known. FIG. 12 shows a main part of a core portion of a housingless oil cooler disclosed in this publication, in which the first plate 11 and the second plate 13 are alternately laminated to form a first plate. Cooling water passages 15 and oil passages 17 are alternately formed between 11 and the second plate 13.

In the first plate 11 and the second plate 13, an aluminum clad having a sacrificial corrosion layer 21 formed on one side of the core material 19 and a brazing material layer 23 formed on the other side of the core material 19 is formed. The material is used, and the sacrificial corrosion layer 21 side of the first plate 11 and the second plate 13 faces the cooling water passage 15. In addition, the first plate 11 has
In order to stir the cooling water and improve the heat exchange efficiency, dimples 25 projecting toward the cooling water passage 15 are formed.

In the core portion of the housingless oil cooler described above, the first plate 11 and the second plate 13 are provided.
Since the side of the sacrificial corrosion layer 21 of is opposed to the cooling water passage 15, it is possible to prevent pitting corrosion on the surfaces of the first plate 11 and the second plate 13 that become the cooling water passage 15.

[0005]

However, in the core portion of such a conventional housingless oil cooler, the sacrificial corrosion layer 13 side of the first plate 11 and the second plate 13 is opposed to the cooling water passage 15. Therefore, the tip end surface of the dimple 25 formed on the first plate 11 cannot be brazed to the second plate 13 side, and the tip end surface of the dimple 25 is only in contact with the second plate 13. When a high pressure is applied to the cooling water passage 15, there is a possibility that sufficient pressure resistance cannot be obtained.

Further, a minute gap is formed between the tip end surface of the dimple 25 and the second plate 13, and there is a possibility that crevice corrosion will occur. The present invention has been made to solve such a conventional problem, and is a housingless type in which the tip end surfaces of the dimples protruding from the plate toward the cooling water passage can be easily and surely brazed to the opposing plate. The purpose is to provide the core part of the oil cooler.

[0007]

According to another aspect of the present invention, there is provided a housing-less oil cooler having a core portion, wherein 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 first plate and the second plate made of the clad material are alternately laminated, the cooling water passage and the oil passage are alternately formed between the first plate and the second plate, and the first plate and the second plate are formed. In a core portion of a housingless oil cooler, wherein the sacrificial corrosion layer side of the plate is opposed to the cooling water passage, and the first plate or the second plate is formed with dimples protruding toward the cooling water passage, A brazing material layer is formed on the outer side of the sacrificial corrosion layer of the first plate and the second plate, and the tip surface of the dimple is brazed to the second plate or the first plate. Characterized in that it comprises.

In the core portion of the housingless oil cooler of claim 2, 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 1st plate and the 2nd plate are laminated alternately, the cooling water passage and the oil passage are alternately formed between the 1st plate and the 2nd plate, and the 1st plate is formed.
A core of a housingless oil cooler in which the sacrificial corrosion layer side of the plate and the second plate is opposed to the cooling water passage, and dimples protruding toward the cooling water passage side are formed in the first plate or the second plate. Part, the sacrificial corrosion layer of the first plate and the second plate is formed of an aluminum alloy in which silicon and zinc are added to aluminum, and the tip surface of the dimple is brazed to the second plate or the first plate. It is characterized by

(Operation) In the core portion of the housingless oil cooler according to the first aspect, the sacrificial corrosion layer side of the first plate and the second plate is arranged on the cooling water passage side and formed outside the sacrificial corrosion layer. By the material layer, the tip end surfaces of the dimples protruding from the first plate or the second plate toward the cooling water passage are brazed to the second plate or the first plate.

In the core portion of the housingless oil cooler of the second aspect, the sacrificial corrosion layer side of the first plate and the second plate is arranged on the cooling water passage side, and is made of an aluminum alloy in which silicon and zinc are added to aluminum. Due to the sacrificial corrosion layer, the tip surface of the dimple protruding from the first plate or the second plate toward the cooling water passage is
It is brazed to the second plate or the first plate.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 is an enlarged view showing details of a B portion in FIG. 3, FIG. 2 is an enlarged view showing a detail of a C portion in FIG. 3, and FIG. 3 is a first embodiment of a core portion of a housingless oil cooler of the present invention. 4 is a longitudinal sectional view taken along line III-III of FIG. 4 showing a housingless oil cooler in which is arranged, FIG. 4 is an exploded perspective view of FIG. 3, and FIG. 5 is a housingless oil cooler of FIG. It is sectional drawing which shows a state.

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 the brazing material on the outer surface are arranged on the upper portion of the core portion 31. The upper casing 37 and the lower casing 39 provide an oil outlet tank 38A. Is formed,
The upper and lower casings 37 and 39 and the first plate 33 form an inlet tank 40A and an outlet tank 40B of the cooling water.

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. The upper casing 37 has a through hole 42 at the center thereof, and the lower casing 39 has a through hole 43 at the center thereof.
An oil passage hole 69 of the first plate 33 is formed near the through hole 43, and the other oil passage hole 69 of the first plate 33 is closed by a 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, a lower plate 49 made of aluminum with a brazing material clad on the upper surface, a reinforcing plate 51 with a brazing material clad on the upper surface, and a mounting plate 53 with a brazing material clad on the upper surface are formed below the core portion 31.
Are sequentially arranged, and these plates have through holes 55,
56 and 57 are formed.

On the side of the through holes 55, 56, 57, an oil inflow hole 59 is formed in which one oil passage hole 69 of the second plate 35 opens, 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.

A packing 97 is attached to the lower portion of the attachment plate 53. Further, through holes 61 and 63 are formed in the centers of the first plate 33 and the second plate 35 that form the core portion 31, respectively, and these through holes 61 and 63 are located outside as shown in FIG. Core reinforcement tube 65 made of aluminum clad with brazing material
Is inserted.

As shown in FIG. 5, an oil return pipe 62A made of, for example, a stud bolt, fixed to a bracket 60A of the engine and forming an oil outflow passage, is inserted through the core reinforcing pipe 65. A screw portion 66A is formed on the upper portion of the oil return pipe 62A, and the core portion 31 is fixed by screwing a nut 66B into the screw portion 66A.

First plate 33 and second plate 35
, Four through holes are formed at an angle (for example, 90 degrees) from the center, two opposing through holes are cooling water passage holes 67, and other two opposing through holes are formed. It is an oil passage hole 69. The second plates 35 are arranged between the first plates 33, respectively.
Plate body 7 of plate 33 and second plate 35
A large number of dimples 34 and 36 for improving heat exchange efficiency are formed on the parts 7 and 83, respectively.

However, in this embodiment, the first plate 33 and the second plate 35 are formed by press-molding a clad material made of aluminum. As shown in FIG. 6, this clad material is a core material made of an aluminum alloy in which manganese is added to aluminum (for example,
JIS 3003) 71 is provided on one side with a sacrificial corrosion layer 73 (for example, JIS 7072, 5005, etc.) made of an aluminum alloy in which zinc is added to aluminum, and on the outside of the sacrificial corrosion layer 73, aluminum in which silicon is added to aluminum is used. A brazing material layer made of an alloy (for example, JI
S4343, 4045), while a brazing filler metal layer (for example, JIS4343, 404) made of an aluminum alloy in which silicon is added to aluminum is formed on the other side of the core material 71.
5) 75 is 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 inner side serves as the brazing material layer 74 on the sacrificial corrosion layer 73 side. On the other hand, the plate body 83 of the second plate 35
Along the outer peripheral edge and the through hole edge, the protruding portions 85 and 87 are integrally formed so as to protrude toward the plate body 77 side of the first plate 33 and become the brazing material layer 74 on the sacrificial corrosion layer 73 side inside. .

Then, as shown in FIGS. 1 to 3, the brazing material layer 75 on the outer side of the protruding 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 brazing material layer 74 on the side of the sacrificial corrosion layer 73 is brazed. The brazing material layer 74 on the side of the sacrificial corrosion layer 73 inside the first plate 33 and the brazing material layer 74 on the side of the sacrificial corrosion layer 73 inside the second plate 35 form a cooling water passage 89. The brazing material layer 75 on the outer side of the plate 35, the brazing material layer 75 on the outer side of the first plate 33, and the brazing material layer 74 on the side of the sacrificial corrosion layer 73 on the inner side of the tubular portions 79, 81 of the first plate 33 are used as oil. A passage 91 is formed.

Also, in this embodiment, the first plate 3
The third cylindrical portion 79 has a large diameter portion 93 formed on the opening end side and a small diameter portion 95 formed on the plate body 77 side. 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 and 81 of the first plate 33 are attached to the protruding portions 85 of the second plate 35. , 8
7 is fitted, and the large diameter portion 93 of the first plate 33 is further fitted.
Is fitted to the small diameter portion 95 of the other first plate 33, the core portion reinforcing pipe 65 is inserted into the through holes 61 and 63 at the centers of these plates 33 and 35 to form the core portion 31, and then the upper and lower casings are formed. 37, 39, 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 in 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.
The cooling water flows out from the cooling water outflow pipe 47 of OB.

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 first plate 3
The sacrificial corrosion layer 73 side of the third and second plates 35 is arranged on the cooling water passage 89 side, and the brazing material layer 74 formed on the outside of the sacrificial corrosion layer 73 projects from the first plate 33 to the cooling water passage 89 side. Since the tip end surface of the dimple 34 is brazed to the second plate 35, the first plate 3
The tip end surface of the dimple 34 protruding from the cooling water passage 89 side can be easily and surely brazed to the second plate 35.

Therefore, even when a high pressure acts on the cooling water passage 89, sufficient pressure resistance can be obtained. Further, since a minute gap is not formed between the tip end surface of the dimple 34 and the second plate 35, it is possible to reliably eliminate the possibility of crevice corrosion.

7 to 10 show a second embodiment of the present invention. In these figures, reference numeral 131
Indicates a core portion formed by alternately stacking the first plate 133 and the second plate 135.

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 center of the lower casing 137 and the lower casing 139, respectively.
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 at the centers of the first plate 133 and the second plate 135 forming the core portion 131, respectively.
A core part 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. First plate 1
The second plates 135 are respectively arranged between the 33, and the plate body 18 of the second plate 135 is arranged.
3 includes dimples 134 for improving heat exchange efficiency.
Are formed so as to project.

However, in this embodiment, the first plate 133 and the second plate 135 are formed by press-molding a clad material made of aluminum. As shown in FIG. 11, this clad material is a sacrificial corrosion layer made of an aluminum alloy in which silicon and zinc are added to aluminum on one side of a core material (for example, JIS3003) 171 made of an aluminum alloy in which manganese is added to aluminum. 173 (for example, an aluminum alloy obtained by adding 1 to 5% by weight of zinc to JIS4343 or 4045) 175 is formed, while a brazing material layer (for example, JIS4343, 4 is formed on the other side of the core material 171).
045) 175 is formed.

The plate body 177 of the first plate 133
The outer periphery and the through-hole edge of the
The cylindrical portions 179 and 181 are integrally formed so as to form 73. On the other hand, the plate body 18 of the second plate 135
Along the outer peripheral edge and the through hole edge of the first plate 13
The protrusions 185 and 187 are integrally formed so as to protrude on the side opposite to the plate body 177 of No. 3 and the inside has a sacrificial corrosion layer 173.

Then, the protruding portion 18 of the second plate 135
The brazing material layer 175 inside the first plate 133 is brazed to the brazing material layer 175 inside the cylindrical portions 179 and 181 of the first plate 133. And an oil passage 189 formed by the brazing material layer 175 outside the second plate 135, and cooled by the sacrificial corrosion layer 173 inside the second plate 135 and the sacrificial corrosion layer 173 outside the first plate 133. A water passage 191 is formed.

The inner fin 190 made of aluminum is brazed in the oil passage 189. In addition, in this embodiment, the first plate 1
The cylindrical portion 179 of 33 has a large diameter portion 193 on the opening end side.
However, a small diameter portion 195 is formed on the plate body 177 side. Then, the large diameter portion 19 of the upper first plate 133
3 is the small diameter portion 19 of the adjacent lower first plate 133.
5 is brazed in a fitted state.

In the housingless oil cooler described above, the cooling water is the cooling water inflow pipe 14 above the core portion 131.
After flowing into the tank portion 141 from 5, the first plate 13
3 and the cooling water passage holes 167 of the second plate 135 and each cooling water passage 191 is filled, and then the oil passage 18
The heat is exchanged with the oil in the tank 9 and flows out from the cooling water outflow pipe 47 of the tank 141.

On the other hand, oil flows into the core portion 131 from the oil inflow hole 159 below 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 dried, and then the inner fins 190 are placed in the cylindrical 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 and the like, heating them in a furnace, and brazing each part.

Thus, in the core portion of the housingless oil cooler configured as described above, the first plate 1
33 and the side of the sacrificial corrosion layer 173 of the second plate 135 are arranged on the side of the cooling water passage 191. Since the tip end surface of the dimple 134 protruding to the first plate 133 is brazed to the first plate 133, the tip end surface of the dimple 134 protruding from the second plate 135 to the cooling water passage 191 side can be easily attached to the first plate 133,
Brazing can be done reliably.

In the second embodiment described above, an example was described in which only the sacrificial corrosion layer 173 was formed of an aluminum alloy in which silicon and zinc were added to aluminum, but the present invention is limited to this embodiment. However, the brazing material layer 175 may also be formed of an aluminum alloy in which silicon and zinc are added to aluminum. In this case, since the same aluminum alloy is arranged on both sides of the core material 171, the brazing material layer 175 is It is not necessary to consider the front and back, and the assembling property can be improved.

[0040]

As described above, in the core portion of the housingless oil cooler according to the first aspect of the present invention, the tip surface of the dimple projecting from the first plate or the second plate toward the cooling water passage is the sacrificial corrosion layer. Since it is brazed to the second plate or the first plate by the brazing material layer formed on the outer side of the second plate, the tip surface of the dimple protruding from the first plate or the second plate toward the cooling water passage is The first plate can be brazed easily and securely.

In the core portion of the housingless oil cooler of the second aspect, the tip end surface of the dimple protruding from the first plate or the second plate toward the cooling water passage is an aluminum alloy in which silicon and zinc are added to aluminum. The sacrificial corrosion layer consisting of the second plate or the first
Since the plate is brazed, the tip end surface of the dimple protruding from the first plate or the second plate toward the cooling water passage can be brazed easily and reliably to the second plate or the first plate.

[Brief description of drawings]

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

FIG. 2 is an enlarged view showing details of a portion C in FIG. 3;

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. 3;

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

FIG. 6 is an enlarged sectional view showing a clad material forming a first plate and a second plate of FIG. 3;

FIG. 7 is a longitudinal sectional view showing details of a VII section in FIG. 8;

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

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

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

FIG. 11 is an enlarged sectional view showing a clad material forming the first plate and the second plate of FIG. 7;

FIG. 12 is a cross-sectional view showing a main part of a core portion of a conventional housingless oil cooler.

[Explanation of symbols]

 33,133 1st plate 35,135 2nd plate 71,171 Core material 73,173 Sacrificial corrosion layer 74,75,175 Brazing material layer 89,189 Cooling water passage 91,191 Oil passage

Claims (2)

[Claims] 1. The sacrificial corrosion layer (7) is provided on one side of the core material (71).
3) is formed, and the first plate (33) and the second plate (35) made of an aluminum clad material on which the brazing material layer is formed on the other side of the core material (71) are alternately laminated, The cooling water passages (89) and the oil passages (91) are alternately formed between the first plate (33) and the second plate (35), and the first plate (33) and the second plate (35) are formed as described above. The sacrificial corrosion layer (73) side is opposed to the cooling water passage (89), and the first plate (3
3) or the second plate (35) in the cooling water passage (8
9) In the core portion of the housingless oil cooler formed with the dimples (34) protruding toward the side, the first plate (33) and the second plate (35)
A brazing material layer (74) is formed on the outside of the sacrificial corrosion layer (73), and the tip end surface of the dimple (34) is brazed to the second plate (35) or the first plate (33). The core part of the housingless oil cooler, which is characterized in that 2. The sacrificial corrosion layer (1) on one side of the core material (171).
73) and a first plate (133) and a second plate (135) made of an aluminum clad material on which a brazing material layer (175) is formed on the other side of the core material (171).
Are alternately laminated to form the first plate (133) and the second plate.
Cooling water passages (191) and oil passages (189) are alternately formed between the plates (135), and the first plate (133) and the second plate (135) are formed.
The side of the sacrificial corrosion layer (173) of the cooling water passage (19
In a core part of a housingless oil cooler, which is opposed to 1) and has a dimple (134) formed on the first plate (133) or the second plate (135) protruding toward the cooling water passage (191). , The first plate (133) and the second plate (13)
5) The sacrificial corrosion layer (173) is formed of an aluminum alloy in which silicon and zinc are added to aluminum, and the tip surface of the dimple (134) is formed on the second plate (135) or the first plate (133). The core part of a housingless oil cooler characterized by being brazed.