JPH10196367A - Oil cooler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oil cooler, facilitate manufacture and reduce weight. SOLUTION: An oil cooler 40 comprises a core part 48 to alternately form oil chambers 44 and cooling water chambers 46 between first plates 42 plurally laminated and a housing 50 to contain the core part 48. A housing 50 is integrally molded out of an aluminum alloy and gaps D3 and D4 having size enough to allow a flow of cooling water are partitioned between the core part 48 and the housing 50. First and second protrusions partially protruding to the inside are formed on the inner surface of the housing 50.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil cooler which is provided, for example, in an engine for an automobile, and which makes an oil for lubricating the engine an appropriate temperature.

[0002]

2. Description of the Related Art FIGS. 6 to 8 show a conventional oil cooler 10, which is a first oil cooler 10 made of stainless steel.
A plurality of plates 12 are stacked, and these first plates 12
A core portion 14 in which an oil chamber and a cooling water chamber are alternately formed.
And a substantially cylindrical stainless steel housing 16 for accommodating the core portion 14.
2 and a pair of oil passages 18 and 19 (FIG. 7) penetrating in the laminating direction and communicating with each oil chamber.
A pair of cooling water passages 20, 21 (FIG. 8) penetrating in the stacking direction of the two and communicating with the respective cooling water chambers are formed.

The housing 16 is formed in a substantially cylindrical shape whose one end is open, and a pair of cooling water pipes 22 and
At the same time, a stainless steel mounting sheet 24 having a mounting seat surface 24a for mounting an oil filter (not shown) is mounted on the outer surface of the bottom portion 16b.
A second plate 26 made of stainless steel is fitted so as to close the opening of the housing 16, and a packing guide 30 holding an O-ring 28 is provided outside the second plate 26.

[0004] Between the core portion 14 and the housing 16,
The distance piece 32 and the water guide 34 are provided so as to define the gaps D1 and D2 through which the cooling water can flow, and to prevent the cooling water from bypassing between the gaps D1 and D2. That is, the distance piece 32 is interposed between the inner surface of the housing bottom portion 16b and the uppermost surface of the core portion 14, and the water guide 34 joins the upper and lower surfaces to the upper surface of the core portion 14 and the side surfaces of the inner periphery of the housing 16. And a structure that partitions the waterway.

[0005] Such an oil cooler 10 has a through-hole 3 of the oil filter and the oil cooler 10 with the oil filter attached to the seating surface 24a of the mounting sheet 24.
6 is fastened and fixed to the engine block from the second plate 26 side via the O-ring 28 by a hollow bolt (not shown) penetrating the engine block.

As shown in FIG. 7, the engine lubricating oil sent from the engine enters each oil chamber from one oil passage 18 and flows in each oil chamber along the circumferential direction. To the oil passage 19. Then the above oil is distance piece 3
It is sent to the inside of the mounting sheet 24 through the holes formed in the housing 2 and the housing bottom 16b, and is sent out to the oil filter through the plurality of holes 24b formed in the mounting sheet 24. Thereafter, the oil filtered by the oil filter is returned to the engine through the inside of a hollow bolt (not shown).

On the other hand, as shown in FIG. 8, the cooling water flowing from the cooling water pipe 22 flows through one of the gaps D1 defined between the core portion 14 and the housing 16 into the cooling water passage 2.
After passing through each cooling water chamber through the cooling water chamber 21 and flowing in the circumferential direction through each cooling water chamber, it is sent out to the cooling water pipe 23 through the other cooling water passage 21 and the gap D2. The cooling water flowing through each of the cooling water chambers is configured so that the oil flowing through the oil chamber is adjusted to an appropriate temperature.

[0008]

The conventional oil cooler 10 includes a distance piece 32 and a water guide 3.
4. Since many members such as the second plate 26 and the packing guide 30 are required, the structure becomes complicated, and the assembling at the time of manufacturing becomes complicated and the weight becomes heavy.

Also, the housing 16, the cooling water pipes 22, 2
3, since each member such as the mounting sheet 24 and the second plate 26 is made of stainless steel, the weight becomes very heavy, which is not preferable from the viewpoint of reducing the weight of the vehicle.

Therefore, if each member such as the housing 16 and the mounting sheet 24 is formed of an aluminum alloy, the mounting sheet 2 which requires strength especially when tightening the oil filter is used.
4 remains uneasy about the rigidity. Also, the seating surface 24 of the mounting sheet 24 that makes a metal touch with a metal oil filter during manufacturing.
There is a problem that a is apt to be scratched and causes oil leakage due to the scratch.

[0011]

The inventions of claims 1 to 4 have been made to solve the above-mentioned problems.

That is, the invention according to claim 1 is an oil cooler having a core portion in which an oil chamber and a cooling water chamber are alternately formed between a plurality of stacked plates, and a housing for accommodating the core portion. Was integrally formed with an aluminum alloy, and a projection partly projecting inward was formed on the inner surface of the housing so as to form a gap through which cooling water could flow between the core portion and the housing. It is characterized by:

According to a second aspect of the present invention, the housing has an outer cylinder portion and a bottom portion, and the first projection portion is formed on the inner surface of the bottom portion so as to partially protrude inward. A pair of second protrusions that partially protrude inward on the inner peripheral surface.

According to a third aspect of the present invention, a mounting sheet having a mounting surface for mounting on an oil filter is formed on a side surface on the side opposite to the mounting surface of an Al-Zn-Mg aluminum alloy, in which an intermediate layer and a brazing material layer are formed in this order. It is characterized in that it is made of a three-layered clad material of an aluminum alloy and brazed to the outer surface of the housing from the brazing material layer side.

According to a fourth aspect of the present invention, a tubular cooling water pipe brazed to the outer tubular portion of the housing and communicated with the gap is provided with a sacrificial material layer, a core material, and a sacrificial material when viewed from the inner peripheral side. And a brazing material layer formed of a four-layer clad material of an aluminum alloy formed in this order.

[0016]

According to the first aspect of the present invention, since the housing is integrally formed of an aluminum alloy, the weight is reduced as compared with a conventional case made of stainless steel. Further, since a projection is formed on the inner surface of the housing so as to partially protrude inward to form a gap between the housing and the core, as in the above-described conventional example,
The distance piece and the water guide as separate members are not required, that is, the number of components is reduced, the structure is simplified, and the assembling at the time of manufacturing becomes easy.

According to the second aspect of the present invention, the first protrusion partly projecting inward from the inner surface of the housing bottom is provided.
In addition to functioning as the distance piece in the above-described conventional example, a pair of second protrusions partially projecting inward from the inner peripheral surface of the outer cylindrical portion function as a water guide in the above-described conventional example, and the housing and the core portion Since the gap is defined between the distance pieces, the distance piece and the water guide are not required. That is, the number of parts is reduced, the structure is simplified, and the assembling at the time of manufacturing is facilitated.

According to the third aspect of the present invention, the Al-Zn-Mg aluminum alloy constituting the mounting sheet has a so-called age-hardening property, and can obtain a strength equivalent to that of mild steel after a certain period of time after heating. Therefore, the hardness and rigidity of the mounting sheet are improved to such an extent that the mounting sheet can be applied to the oil cooler. That is, it is possible to suppress the occurrence of scratches on the mounting seat surface that comes into contact with the oil filter at the time of assembly, and thus to prevent liquid leakage due to the scratches.

Further, since the mounting sheet is made of a three-layer clad material of aluminum alloy, the weight is reduced as compared with the case where the mounting sheet is made of stainless steel or the like. Furthermore, since the brazing material layer is formed on the outside, it can be brazed integrally with the housing made of an aluminum alloy, and the manufacture thereof is facilitated.

According to the fourth aspect of the present invention, since the cooling water pipe is made of a four-layer clad material of an aluminum alloy, the weight is reduced as compared with a case where the cooling water pipe is made of stainless steel or the like. In addition, since the brazing material layer is formed on the outer peripheral side, it can be brazed integrally with the housing made of an aluminum alloy, which facilitates the production. And, since the sacrificial material layers are provided on both surfaces of the core material, while preventing pitting due to the cooling water flowing inside the sacrificial material layers on the inner peripheral surface side, the sacrificial material layers on the outer peripheral surface side
For example, it is also possible to effectively prevent pitting corrosion caused by water that inevitably invades the rubber hose attached to the cooling water pipe. That is, it is possible to effectively prevent a decrease in strength and water leakage due to pitting.

[0021]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

1 to 3 show an oil cooler 40 according to an embodiment of the present invention. The oil cooler 40 has a plurality of first plates 42 stacked and
A core portion 48 in which flat oil chambers 44 and cooling water chambers 46 are alternately formed, and a housing 5 for accommodating the core portion 48
0.

Each first plate 42 is formed in an annular dish shape having an outer peripheral flange and an inner peripheral flange, and is formed of an aluminum alloy clad material in which a sacrificial material layer or a brazing material layer is clad on both surfaces of a core material. I have. The first plate 42
Are two types of plates 4 having different shapes that are alternately stacked.
2a and 42b. The core portion 48 has four passages 52 to which penetrate the first plate 42 in the stacking direction.
55 are formed at every 90 degrees, and a pair of opposed oil passages 52 and 53 (see FIG. 1) communicate with the oil chambers 44 every other stage, and the other pair of opposed coolant passages 5 are formed.
4, 55 (see FIG. 2) communicate with the cooling water chambers 46 every other stage. Heat transfer fins 56 are interposed in each oil chamber 44, and a plurality of embossed portions 58 are formed on the surface of one plate 42a constituting the upper surface of the cooling water chamber 46 in FIG. Thus, the width of the oil chamber 44 and the cooling water chamber 46 is made uniform in the plane direction while increasing the rigidity of the core portion 48 in the stacking direction.

The housing 50 is formed in a substantially cylindrical shape having one end opened, and has a mounting hole 5 formed in an outer cylindrical portion 50a.
A pair of cooling water pipes 60 and 61 are fixed to the first and the 51 by brazing, and a mounting sheet 6 having a mounting seat surface 62a for mounting an oil filter (not shown) on the outer surface of the bottom 50b.
2 is fixed by brazing, and the opening 64 of the housing 50 is closed by the second plate 66.

4 and 5 show the housing 50 alone.
FIG. 4 is a view from the bottom 50b side, and FIG. 5 is a view from the opening side. In this embodiment, each part of the housing 50 is integrally formed of an aluminum alloy by a well-known cold forging (impact molding) method of an aluminum alloy. That is, the outer cylinder 50a, the bottom 50b, and the through-hole 6 are formed.
8 and an inner cylindrical portion 50c which is integrally formed. As shown in FIG. 4, two grooves 70 with which the legs 62b of the mounting sheet 62 engage are formed concentrically on the outer surface of the bottom portion 50b.

On the inner surface of the bottom portion 50b, as shown in FIG. 5, one oil passage hole 78 is formed, and in addition, a first protruding portion 72 which partially protrudes inward is formed. . That is, as shown in FIG. 2, the bottom portion 50 b is formed such that the first protrusion 72 becomes thick and abuts and brazes on the uppermost surface of the core portion 48, and at the portion 74 other than the first protrusion 72, Gaps D3 and D4 are formed between the uppermost surface of the core portion 48.

On the other hand, as shown in FIGS. 1 and 5, on the inner peripheral surface of the housing outer cylindrical portion 50a, a pair of second projecting portions 76 partially protruding toward the inner peripheral side, that is, toward the core portion 48, are provided in the width direction. And is formed in a belt-like shape to abut on the outer periphery of the core portion 48.
Be brazed. That is, the first protrusion 72 functions as a distance piece of the above-described conventional example, and
The projection 76 functions as a water guide of the above-described conventional example, and forms gaps D3 and D4 between the inner peripheral surface of the outer cylindrical portion 50a and the outer peripheral surface of the core portion 48. The bypass is prevented.

Referring again to FIGS. 1 to 3, the mounting sheet 62 is made of a JIS 7000-based Al-Zn-Mg aluminum alloy 82 such as JIS 7N01 as shown in FIG.
A three-layer clad material of a thin aluminum alloy having an intermediate layer 84 and a brazing material layer 86 formed in this order on the side surface on the side opposite to the seating surface 62a is formed in a substantially annular dish shape by press molding. Here, the intermediate layer 84 is made of Al such as JIS3003.
-Mn aluminum alloy, the brazing material layer 86 is JIS4
JIS4000A represented by 045 and 4343
1.0-2.0 l-Si aluminum alloy or zinc
It is formed of an aluminum alloy to which weight% is added. The mounting sheet 62 is attached to the housing bottom 50 from the brazing material layer 86 side.
b is brazed to the outer surface.

As shown in the enlarged view of FIG. 2, each of the cooling water pipes 60 and 61 has a sacrificial material layer 88 and a core material 9 as viewed from the inner peripheral side.
0, a sacrificial material layer 92, and a brazing material layer 94 are formed in a substantially cylindrical shape by a four-layer clad material of an aluminum alloy formed in this order. Here, the sacrificial material layers 88 and 92 are made of, for example, JIS.
7072 or an aluminum alloy such as pure aluminum (A1070), and the core material 90 is made of Al such as JIS3003.
-Mn aluminum alloy, brazing material 94 is JIS
JIS 4000 type Al-S such as 4045 and 4343
It is made of an i-aluminum alloy material or an aluminum alloy obtained by adding 1.0 to 2.0% by weight of zinc thereto. In each of the cooling water pipes 60 and 61, a brazing material layer 94 on the outer peripheral side is brazed to the inner walls of the mounting holes 51 and 51 of the housing outer tubular portion 50a. (Not shown) is attached.

The second plate 66 is made of an aluminum alloy and is formed in an approximately inseparable substantially annular shape. The second plate 66 is fitted on the inner and outer cylindrical portions 50c and 50a of the housing 50 on the inner and outer peripheral surfaces thereof. The opening is closed. Further, a taper 66a corresponding to the outer and inner peripheral flanges of the first plate 42 at the lowest stage of the core portion 48 is formed on the side surface of the second plate 66 on the core portion 48 side. The outer peripheral surface of the plate 42 is pressed and fitted. The second plate 66 has a seat surface 66b attached to an engine block (not shown),
A packing groove 66c in which an O-ring (not shown) is provided is formed on the entire circumference of the seat surface 66b. Reference numeral 66d in FIG. 1 is an oil inlet hole communicating with one oil passage 52.

In such an oil cooler 10, the oil filter is attached to the seating surface 62 a of the mounting sheet 62, and the engine block from the second plate 26 side through the hollow bolt 96 penetrating the oil filter and the oil cooler 40. Is fastened and fixed. At this time, the space between the seat surface 66b of the second plate 66 and the mounting surface on the engine block side is appropriately sealed by the O-ring provided in the packing groove 66c of the second plate 66.

In the oil cooler 40 having such a structure, the oil for engine lubrication sent from the engine side is supplied from the oil inlet hole 66d of the second plate 66 through the oil passage 52 to each oil as shown in FIG. Room 44
After flowing into each oil chamber 44 along the circumferential direction, it is sent out to the other oil passage 53. Then, the oil is sent to the inside of the mounting sheet 62 through an oil passage hole 78 formed in the housing bottom 50b,
The oil is sent out to the oil filter through the hole 62c of the mounting sheet 62. Thereafter, the oil filtered by the oil filter is returned to the engine side through an oil return passage 96a in the hollow bolt 96.

On the other hand, as shown in FIG. 2, the cooling water flowing from one cooling water pipe 60 passes through a cooling water passage 54 from one gap D3 defined between the core portion 48 and the housing 50. To enter each cooling water chamber 46,
After passing through the cooling water passage 6 in the circumferential direction, it is sent to the cooling water pipe 61 through the cooling water passage 55 and the other gap D4. The cooling water flowing in each cooling water chamber 46 is configured so that the oil flowing in the oil chamber 44 is appropriately heated.

Next, a method of manufacturing the oil cooler 40 will be described. First, the first plate 4 constituting the core portion 48
2, heat transfer fins 44, housing 50, cooling water pipe 60,
A non-corrosive flux is applied to the surface of each member such as 61, the mounting sheet 62 and the second plate 66, and then dried. Next, the above-mentioned members are heated in a furnace for a predetermined time in a state of being assembled and held as shown in FIGS. 1 and 2 using a holding jig (not shown). Thereby, the oil cooler 40 in which the members are integrally brazed and fixed is manufactured.

According to the present embodiment as described above, the following effects can be obtained.

First, the first part of the oil cooler 40
Plate 42, housing 50, cooling water pipes 60, 61,
Since each member such as the mounting sheet 62 and the second plate 66 is formed of an aluminum alloy, the weight is significantly reduced as compared with a case where each member is formed of an iron-based metal such as stainless steel.

Second, the first and second projections 72 and 76 are formed on the inner surface of the housing 50 to form the gaps D3 and D4 between the housing 50 and the core 48. As described above, the distance piece and the water guide as separate members are unnecessary, that is, the number of parts is reduced, the structure is simplified, and the assembling at the time of manufacturing is facilitated.

Third, the mounting sheet 62 is made of Al-Zn-
Since the intermediate layer 84 and the brazing material layer 86 are formed of an aluminum alloy material in which the intermediate layer 84 and the brazing material layer 86 are formed in this order on the side surface on the side opposite to the seating surface 62a of the Al-Zn-Mg aluminum alloy 82 made of a Mg aluminum alloy material, it is lightweight and strong. It will be excellent.

More specifically, the Al-Zn-Mg aluminum alloy material such as 7N01 constituting the Al-Zn-Mg aluminum alloy 82 has a so-called age hardening property, is cooled in a furnace after brazing, and further cooled at room temperature. After 1-2 weeks have passed, strength equivalent to mild steel is obtained. For example, JIS3003
While the tensile strength of the aluminum alloy of JIS7N01 is 8 to 10 kg / mm2, the tensile strength of the aluminum alloy of JIS7N01 is 52 to 58 kg / mm2.
A strength several times as high as Kg / mm2 can be obtained. As a result, the hardness and rigidity of the mounting sheet 62 are improved, and for example, scratches generated on the mounting seat surface 62a that comes into contact with the oil cooler at the time of manufacturing are reduced, thereby preventing damage, liquid leakage, and the like due to the scratches. it can.

Further, since the brazing material layer 86 is formed on the outer surface of the mounting sheet 62 on the core portion 48 side, the brazing material 86 can be integrally brazed with the housing 50 made of an aluminum alloy, thereby facilitating the manufacture. In other words, the above Al-Zn-
The Al-Zn-Mg aluminum alloy 82 constituting the Mg aluminum alloy 82 has a characteristic that brazing is difficult due to the effect of Mg contained therein, and cannot be used as it is for an oil cooler. In this embodiment, Al-Zn-Mg
By forming a three-layer structure in which an intermediate layer 84 and a brazing material layer 86 are clad on one side surface of the aluminum alloy 82, brazing to the housing 50 is possible, that is, the mounting sheet 62 is applicable to the oil cooler 40. .

Fourth, since each of the cooling water pipes 60 and 61 is made of a four-layer clad material of an aluminum alloy and a brazing material layer 94 is formed on the outer peripheral surface, the housing 50 made of an aluminum alloy is formed.
Can be integrally brazed, and its manufacture becomes easy. Also,
Since the sacrificial material layers 88 and 92 are provided on both surfaces of the core material 90, pitting corrosion due to cooling water flowing inside the sacrificial material layer 88 on the inner peripheral surface side is prevented, and the sacrificial material layer 92 on the outer peripheral surface side is used, for example. Pitting corrosion due to water that inevitably invades the rubber hose attached to the cooling water pipes 60 and 61 can also be effectively prevented. That is, it is possible to effectively prevent a decrease in strength and water leakage due to pitting.

Fifth, since the second plate 66 having the packing groove 66c is integrally formed of an aluminum alloy, the number of parts is smaller than that of the conventional case where the end plate and the packing guide are provided separately. As a result, the structure is simplified, and the assembling at the time of manufacture becomes easy.

[Brief description of the drawings]

FIG. 1 is a sectional view on an oil passage side of an oil cooler according to an embodiment of the present invention.

FIG. 2 is a sectional view of the oil cooler of FIG. 1 on a cooling water passage side.

FIG. 3 is a top view of the oil cooler of FIG. 1;

FIG. 4 is a front view of the housing of the oil cooler of FIG. 1 as viewed from the bottom alone;

FIG. 5 is a front view of the housing of FIG. 4 viewed from the opening side alone;

FIG. 6 is a top view showing a conventional oil cooler.

FIG. 7 is a cross-sectional view of the oil cooler of FIG. 6 on the oil passage side.

8 is a sectional view of the oil cooler of FIG. 6 on the side of a cooling water passage.

[Explanation of symbols]

 40 oil cooler 42 first plate 44 oil chamber 46 cooling water chamber 48 core 50 housing 50a outer cylinder 50b bottom 60, 61 cooling water pipe 62 mounting seat 62a mounting seat 72 1st projection part 76 ... 2nd projection part 82, 90 ... Core material 84 ... Intermediate layer 86, 94 ... Brazing material layer 88, 92 ... Sacrificial material layer D3, D4 ... Gap

Claims (4)

[Claims] 1. An oil cooler having a core portion in which oil chambers and cooling water chambers are alternately formed between a plurality of stacked plates, and a housing for accommodating the core portion, wherein the housing is integrally formed of an aluminum alloy. Molded, and
An oil cooler, wherein a projection partly projecting inward is formed on an inner surface of the housing so as to form a gap through which cooling water can flow between the core portion and the housing. 2. The housing has an outer cylinder portion and a bottom portion, and a first projection partly projecting inward is formed on an inner surface of the bottom portion, and an inner projection surface is formed on an inner peripheral surface of the outer cylinder portion. 2. The oil cooler according to claim 1, wherein a pair of second protrusions that partially protrude are formed. 3. An aluminum sheet having an intermediate layer and a brazing material layer formed in this order on a side surface of the Al-Zn-Mg aluminum alloy opposite to the mounting seat surface. 3. The oil cooler according to claim 1, wherein the oil cooler is made of a three-layer clad material and is brazed to the outer surface of the housing from the brazing material layer side. 4. A sacrificial material layer, a core material, a sacrificial material layer, and a brazing material layer, when viewed from the inner peripheral side, a tubular cooling water pipe brazed to an outer cylindrical portion of the housing and communicated with the gap. 3. The oil cooler according to claim 1, wherein said oil cooler is a four-layer clad material of an aluminum alloy formed in this order.