JPH08291981A - Oil cooler for aluminum automobile - Google Patents

Abstract

PURPOSE: To improve the heat radiating performance by concentrically disposing a pair of cooling water entrance/exit pipe and a double tube oil cooler, and specifying the ratio of the sectional area of the oil inner tube of the cooler inserted into the inner tube to the total sectional area of the cooling water passage. CONSTITUTION: The ratio of the sectional area of the oil inner tube 51 of a double tube oil cooler 5 in which the centerline CL1 of a pair of cooling water entrance/exit pipe 60 coincides with the centerline CL2 of the oil inner tube 51 of a double tube oil cooler 50 and which is inserted into the oil inner tube inserting hole 32 to the total sectional area of a cooling water passage 34 is 1:0.5 to 1:1.4. The sum of the sectional area of the tube 51 and the total sectional area of the passage 34 is equal to or larger than the water entrance/exit passage sectional area of the pipe 60. Thus, the cooling water flows uniformly around the cooler 50 to improve the heat radiating performance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aluminum oil cooler for automobiles, which is attached to a pipe connecting a radiator tank and an engine.

[0002]

2. Description of the Related Art Conventionally, as this type of oil cooler for automobiles, an oil cooler with a built-in pipe is known as disclosed in Japanese Utility Model Publication No. 59-130023, Honda Matrito Service Manual, Suzuki Every Service Manual, etc. Has been. 14 to 17 show these oil coolers with built-in pipes. In these figures, only one side is shown for convenience.

In FIGS. 14 and 15, reference numeral 1 denotes an outer cylinder. A funnel-shaped cooling water inlet / outlet pipe 2 is provided at both ends of the outer cylinder 1.
Is attached. A double pipe type oil cooler 3 including an inner oil pipe 4, an outer oil pipe 5 and an inner fin 6 arranged between the outer pipe 1 and the outer pipe 1 has a center line C ₁ of the cooling water inlet / outlet pipe 2. It is attached at a position offset from the center line C ₂ .

A bulging portion 7 is formed at both ends of the double-tube oil cooler 3, and an oil inlet / outlet pipe 8 is attached so as to communicate with the bulging portion 7 and an insertion hole 10 for the outer cylinder 1 is formed.
Projecting from. The insertion hole 10 of the outer cylinder 1 is formed in the bulging portion 9 provided in the outer cylinder 1. The bulging portion 9 has a substantially similar shape so that the bulging portion 7 of the double-tube oil cooler 3 can be fitted therein.

Reference numeral 11 is a cooling water hose. 16 and 17 show another example, in which the seat 12 is added to the oil cooler with a built-in pipe of FIGS. 14 and 15.
The oil cooler with built-in piping shown in FIGS. 14 to 17 is made of brass, copper, or the like.
Soldered or hard brazed.

Further, in order to prevent corrosion from the outside, coating or surface treatment is applied.

[0007]

However, FIG. 14 to FIG.
The oil cooler with a built-in pipe shown in 7 has the following drawbacks.

(1) Center line C of the double-tube oil cooler 3
_{Since 1} is attached at a position offset from the center line C _{2 of the} cooling water inlet / outlet pipe 2, it is difficult for the cooling water to flow uniformly. Therefore, there is a problem that the heat dissipation performance is poor. (2) Since it is made of a material having a large specific gravity such as brass and copper, the weight is heavy. (3) Since it is brazed with solder or hard brazing, the brazing work is complicated and it is not suitable for mass production.

(4) External coating and surface treatment are required, and the cost is high. (5) In order to surely bond the outer cylinder 1 and the double-tube oil cooler 3 to each other, it is necessary to form the outer cylinder 1 into a shape corresponding to the shape of the abutting portion, which is troublesome. The present invention has been made to solve such conventional problems, and an object thereof is to provide an aluminum oil cooler for automobiles, which improves heat dissipation performance, is suitable for mass production, and can be reduced in weight. .

[0010]

According to the invention of claim 1, an outer cylinder arranged between two seats, a double pipe type oil cooler arranged between both seats, and outer ends of both seats are provided. It consists of a funnel-shaped cooling water inlet / outlet pipe to be arranged and an oil inlet / outlet pipe attached to both seats. Both seats have an inner oil pipe insertion hole and an inner oil pipe insertion hole provided at the center. A cooling water passage provided around and an oil inlet / outlet which is orthogonal to the oil inner pipe insertion hole and is provided with an oil inlet / outlet pipe,
It is composed of an oil passage that is concentric with the oil inner pipe insertion hole and communicates with the double pipe oil cooler. The ratio of the cross-sectional area of the oil inner pipe of the double-pipe type oil cooler inserted into the oil inner pipe insertion hole to the total cross-sectional area of the cooling water passage is 1: 0.5 to 1: 1.4. It is characterized by that.

According to a second aspect of the present invention, the sum of the sectional area of the oil inner pipe and the total sectional area of the cooling water passage of the double pipe type oil cooler inserted through the oil inner pipe insertion hole is the cooling water inlet / outlet pipe. The water inlet / outlet passage sectional area is equal to or larger than that.

[0012]

In the aluminum oil cooler for automobiles according to the first and second aspects, when the cooling water flowing between the radiator and the engine flows from the cooling water inlet / outlet pipe, the oil inner pipe and the cooling water passage are connected to each other. It flows out from the cooling water inlet / outlet pipe on the downstream side.

During this time, the cooling water that has entered the oil inner pipe is
It flows evenly around the built-in double-tube oil cooler and flows inside the double-tube oil cooler. on the other hand,
When oil such as transmission oil is guided from the oil inlet / outlet pipe through the oil inlet / outlet of the seat to the oil passage, it flows into the oil passage, and the oil inner pipe, oil outer pipe, and inner fin of the double-tube oil cooler The oil flows into the oil passage composed of, and flows down toward the other sheet while being disturbed and stirred by the inner fins.

At this time, the heat of the oil transmitted through the oil inner pipe and the oil outer pipe is radiated by the cooling water. And
The oil is returned from the oil inlet / outlet of the other sheet through the oil inlet / outlet pipe.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on the embodiments shown in the drawings.

1 to 5 show an embodiment of an aluminum oil cooler for automobiles according to the first and second aspects. In the figure, 20 represents an outer cylinder made of aluminum.
The outer cylinder 20 has an outer sacrificial material (JIS A7072).
Al--Zn alloy) and a brazing material (Al--Si--Zn alloy) having a sacrificial corrosion effect are laminated inside by means such as a clad.

The outer cylinder 20 is arranged between two sheets 30. Both sheets 30 are cylindrical base materials 3 made of an aluminum material (JIS A3003 etc.) that can be integrally brazed.
No. 1 is formed, and an oil inner pipe insertion hole 32 for inserting the oil inner pipe 51 of the double-pipe type oil cooler 50 and fixing the oil inner pipe 51 at the time of brazing is provided in the central portion.

The oil inner pipe insertion hole 32 is formed in the base material 31.
The oil passage 33 is located on the one side surface 31a side and is located concentrically with the inner oil pipe insertion hole 32 on the rear side thereof and communicates with the aluminum double pipe oil cooler 50.
Are formed. The oil passage 33 is open to the other side surface 31 b side of the base material 31, has an inner diameter larger than that of the inner oil pipe insertion hole 32, and has an oil passage 54 of the double-tube oil cooler 50 and the oil inlet / outlet pipe 40. It distributes oil to and.

Four cooling water passages 34 having an arcuate cross section are provided to penetrate the base material 31 around the inner oil pipe insertion hole 32. An oil inlet / outlet 35 is provided which is orthogonal to the oil inner pipe insertion hole 32 and communicates with the oil passage 33. An oil inlet / outlet pipe 40 made of aluminum having a brazing material having a sacrificial corrosion effect laminated on the outside is inserted into the oil inlet / outlet 35, and fixed at the time of brazing.

On the side of the other side surface 31b of the base material 31, there is provided an annular projection portion 36 into which the tip of the oil outer pipe 52 of the double pipe oil cooler 50 is fitted and fixed at the time of brazing. On one side surface 31a of the base material 31, there is provided an annular step portion 37 into which the tip 60a of the aluminum-made funnel-shaped cooling water inlet / outlet pipe 60 is fitted and which is fixed during brazing. Further, on the other side surface 31b of the base material 31, there is provided an annular step portion 38 into which the front end 20a of the outer cylinder 20 is fitted and which is fixed during brazing.

The funnel-shaped cooling water inlet / outlet pipe 60 made of aluminum is provided on the outside with a sacrificial material (JIS A707).
2) and a brazing material having a sacrificial corrosion effect (Al—Si—Zn alloy) are laminated inside by means of a clad or the like. The aluminum funnel-shaped cooling water inlet / outlet pipe 60 is provided with a bead portion 61 for fixing the cooling water hose 70.

Double pipe oil cooler 5 made of aluminum
0 is an inner oil pipe 51 in which a brazing material having a sacrificial corrosion effect is laminated on the outside and a sacrificial material (Al-Zn alloy such as JIS A7072) is laminated on the inside by means such as a clad,
A brazing material with a sacrificial corrosion effect inside and a sacrificial material outside (J
(Al-Zn alloy such as IS A7072) is inserted between the oil outer pipe 52 and the oil inner pipe 51 and the oil outer pipe 52, which are laminated by means such as a clad, and the oil inner pipe 51 when brazing. Aluminum material that can be integrally brazed to the outer oil pipe 52 (JIS
A3003) and the inner fin 53.

Here, the center line CL _{1 of} both cooling water inlet / outlet pipes 60 and the oil inner pipe 51 of the double pipe type oil cooler 50.
The ratio of the center line CL ₂ matches, the total cross-sectional area SC of the cross-sectional area SA and four cooling water passage 34 of the oil within the pipe 51 is inserted into the oil in the pipe insertion hole 32 double pipe type oil cooler 50 Is 1: 0.5 to 1: 1.4. Further, the double-tube type oil cooler 50 inserted through the oil inner tube insertion hole 32.
Cross-sectional area SC ₁ of the total cross-sectional area SC (4 one cooling water passage 34 of the cross-sectional area SA of the oil in the tube 51 the cooling water passage 34 to SC ₄
The sum of the water inlet / outlet passage 60 of the cooling water inlet / outlet pipe 60 is equal to or larger than the sum.

A hose 80 for circulating oil such as a transmission is attached to the oil inlet / outlet pipe 40. Next, a method of manufacturing the aluminum oil cooler for automobiles according to this embodiment will be described. First, the inner fin 53 is inserted into the oil outer pipe 52. Next, after covering the oil outer pipe 52 with the outer cylinder 20, the two sheets 3
The oil outer tube 52 is press-fitted into the annular protrusion 36 of 0, and the tip 20a of the outer cylinder 20 is press-fitted into the annular step portion 38 of both seats 30.

Next, the oil inner pipe 51 is inserted into the oil inner pipe insertion holes 32 of both sheets 30. Then, the inner oil pipe 51 is expanded from the one side surface 31a of the seat 30. As a result, the two sheets 30, the outer cylinder 20, the oil outer tube 52, and the inner fin 53 are fixed by the oil inner tube 51. Next, the tip 60a of the cooling water inlet / outlet pipe 60 is press-fitted into the annular step portion 37 of both sheets 30.

Next, the oil inlet / outlet ports 35 of both seats 30
Then, the aluminum oil inlet / outlet pipe 40 is press-fitted. With the above, the temporary assembly is completed. The temporarily assembled structure is assembled by expanding the tube and press-fitting, so that it will not be easily disassembled in the carrying step. Next, according to a conventional method, the brazing material, which is carried into the brazing apparatus and fired here and clad in each material, is melted to bond the materials to be bonded together.

The corrosive flux is applied by means such as coating or dipping at any time during the assembly process. The operation of the present embodiment configured as described above will be described. The cooling water flowing between the radiator (not shown) and the engine (not shown) flows from the cooling water inlet / outlet pipe 60 through the cooling water hose 70. Then, it flows out from the cooling water inlet / outlet pipe 60 on the downstream side via the oil inner pipe 51 and the four cooling water passages 34.

During this time, the cooling water that has entered the oil inner pipe 51 flows through the inside of the double-tube oil cooler 50, and the cooling water that has entered the four cooling water passages 34 does not change. Flowing outside. On the other hand, oil such as transmission oil is guided from the oil inlet / outlet pipe 40 via the hose 80 to the oil passage 33 via the oil inlet / outlet 35 of the seat 30.

The oil that has flowed into the oil passage 33 is the inner oil pipe 51 and the outer oil pipe 5 of the double-tube oil cooler 50.
2 and the inner fin 53
And flows down toward the other sheet 30 while being disturbed and agitated by the inner fins 53. On this occasion,
The heat of the oil transmitted through the oil inner pipe 51 and the oil outer pipe 52 is radiated by the cooling water.

Then, the oil is returned from the oil inlet / outlet 35 of the other sheet 30 through the oil inlet / outlet pipe 40 and the hose 80. As described above, in the present embodiment, the outer cylinder 20 arranged between the two seats 30, the double-tube oil cooler 50 arranged between the seats 30, and the outer end portions of the seats 30 are arranged. The cooling water inlet / outlet pipe 60 and the oil inlet / outlet pipe 40 attached to both seats 30 are provided. The both seats 30 have an oil inner pipe insertion hole 32 provided at the center and an oil inner pipe. Insertion hole 3
2, a cooling water passage 34, an oil inlet / outlet 35 for attaching the oil inlet / outlet pipe 40 orthogonal to the oil inner pipe insertion hole 32, and an oil inlet / outlet pipe 32 located concentrically with the oil inner pipe insertion hole 32. The cooling water inlet / outlet pipe 60 is composed of an oil passage 33 communicating with the heavy pipe type oil cooler 50.
Center line CL ₂ of the center line CL ₁ and the oil within the pipe 51 of the double pipe type oil cooler 50 is matched, the oil in the pipe insertion hole 32
Oil pipe 5 of the double pipe type oil cooler 50 inserted in the
The ratio of the cross-sectional area SA of 1 to the total cross-sectional area SC of the cooling water passage 34 is 1: 0.5 to 1: 1.4, so that the cooling water flows evenly in the outer cylinder 20 and flows. Water resistance can be reduced and cavitation can be prevented. Also, the heat dissipation performance is improved.

In particular, the cross-sectional area S of the inner oil pipe 51 of the double-tube type oil cooler 50 inserted through the inner oil pipe insertion hole 32.
When the ratio of A1 to the total cross-sectional area SA2 of the four cooling water passages 34 is 1: 0.5 to 1: 1.4, the heat radiation performance may be maximized as shown in FIG. It has been confirmed.

Also, by using brazing materials of all materials, the components can be brazed integrally with the sheet 30. Since corrosion is prevented by the material not only on the cooling water side but also on the outside, painting and surface treatment are unnecessary. Since parts other than the oil inlet / outlet pipe 40 and the cooling water inlet / outlet pipe 60 can be integrally assembled by expanding the oil inner pipe 51, temporary fixing by a spot or the like at the time of assembling becomes unnecessary, and an assembling jig or temporary fixing is unnecessary. Work can be abolished. In addition, they can be assembled as a unit, the binding force is kept stable even in the furnace, and the brazing property is improved.

FIG. 7 shows a modification of the seat 30. FIG.
In the embodiment shown in FIG. 4, the case where four cooling water passages 34 are provided has been described. However, the cross-sectional area SA1 of the oil inner pipe 51 of the double pipe oil cooler 50 inserted into the oil inner pipe insertion hole 32 and four If the ratio of the total cross-sectional area SA2 of the cooling water passage 34 is 1: 0.5 to 1: 1.4, FIG.
As described above, one cooling water passage 34 may be used.

Therefore, the number of the cooling water passages 34 is not particularly limited as long as the heat radiation performance and the inside / outside flow rate ratio have the above relationship. FIG. 8 shows another embodiment of the aluminum oil cooler for automobiles according to claims 1 and 2. In the present embodiment, the fitting portion between the seat 30 and the outer cylinder 20 is attached to the annular projection 381 provided on the seat 30 by the outer cylinder 20.
The fitting portion between the seat 30 and the cooling water inlet / outlet pipe 60 is formed by fitting with the leading end 20a of the cooling water inlet / outlet pipe 60 to the annular projection 371 provided on the seat 30.
This is done by fitting a.

Further, the outer oil pipe 52 of the double pipe oil cooler 50 is fitted inside the annular projection 36 of the seat 30. Of course, the oil inner and outer pipes and the water inlet / outlet pipe are provided with a brazing material having a sacrificial corrosion effect on the side fitted with the seat 30.

Also in this embodiment, the same operational effects as those of the above embodiment can be obtained. 9 to 12 show modified examples of the seat 30. In FIG. 9, the outer diameter of the seat 30 is substantially a kamaboko shape. In this sheet 30,
By providing a hole for mounting the bracket on the flat surface portion, the bracket can be mounted on the mounting surface of the vehicle.

FIG. 10 shows a rail 30 on the side of the seat 30.
a is provided. This rail 30a may be one. The rail 30a can be attached to a bracket provided on the vehicle, or the bracket 30d provided with a brazing material can be inserted into the rail 30a to integrally braze the bracket 30d in the furnace. In FIG. 11, the seat 30 has a polygonal shape such as a quadrangle, and the bracket mounting hole 30b is provided.
Is provided.

FIG. 12 shows an example of attachment of the seat shown in FIG. The bracket 90 is mounted by screwing the bolt 91 into the bracket mounting hole 30b of the seat 30. The bracket 90 is attached to the vehicle body via bolts 92. In FIG. 13, the seat 30 has a box cross section and the fitting portion of the cooling water inlet / outlet pipe 60 is rectangular.

In the above embodiment, the inner fin 53 is used.
Although the case of using is explained, it can be omitted.

[0040]

As described above, according to the inventions described in claims 1 and 2, since the aluminum is integrally brazed, the brazing work can be simplified and suitable for mass production. Made of aluminum, so conventional brass,
It is much lighter than a copper oil cooler. Assembly work of each part is easy and work efficiency is improved. The use of aluminum material, which has a sacrificial corrosion effect, eliminates the need for painting and surface treatment. Cooling water flows evenly around the double-tube oil cooler with built-in cooling water, improving heat dissipation performance.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part showing an embodiment of an aluminum oil cooler for automobiles according to claims 1 and 2.

FIG. 2 is a longitudinal sectional view of FIG.

FIG. 3 is a front view of the aluminum oil cooler for automobiles of FIG. 1 viewed from a cooling water inlet / outlet port.

FIG. 4 is a front view of the seat of FIG.

5 is a side view of the aluminum automobile oil cooler of FIG. 1. FIG.

FIG. 6 is a diagram showing the relationship between the heat dissipation performance and the internal / external flow rate ratio of the aluminum automobile oil cooler of FIG. 1.

FIG. 7 is a front view showing a modified example of the seat of FIG.

FIG. 8 is a cross-sectional view of essential parts showing a modified example of the aluminum oil cooler for automobiles of FIG. 1.

9 is a perspective view showing a modified example of the seat of FIG. 1. FIG.

FIG. 10 is a perspective view showing a modified example of the seat of FIG.

11 is a perspective view showing a modified example of the seat of FIG.

12 is a perspective view showing a mounting example of a mounting bracket of the seat of FIG. 11. FIG.

FIG. 13 is a perspective view showing a modified example of the seat of FIG.

FIG. 14 is a cross-sectional view of an essential part showing a conventional automobile oil cooler.

15 is a vertical cross-sectional view of FIG.

FIG. 16 is a sectional view of an essential part showing a conventional oil cooler for an automobile.

FIG. 17 is a vertical sectional view of FIG.

[Explanation of symbols]

 20 outer cylinder 30 seat 32 oil inner pipe insertion hole 33 oil passage 34 cooling water passage 35 oil inlet / outlet 40 oil inlet / outlet pipe 50 double pipe type oil cooler 51 oil inner pipe 52 oil outer pipe 53 inner fin 54 oil passage 60 Cooling water inlet / outlet pipe

Claims (2)

[Claims] 1. An outer cylinder (20) arranged between two seats (30), a double pipe type oil cooler (50) arranged between both seats (30) and both seats (30). A funnel-shaped cooling water inlet / outlet pipe (60) arranged at the outer end and an oil inlet / outlet pipe (4) attached to both seats (30).
0) and both sheets (30) have an inner oil pipe insertion hole (32) provided at the center and a cooling water passage (34) provided around the inner oil pipe insertion hole (32). , Oil inner tube insertion hole (3
2) An oil inlet / outlet (35) orthogonal to 2) for attaching an oil inlet / outlet pipe (40) and an oil inner pipe insertion hole (32)
It is located concentrically with and is a double-tube oil cooler (5
0) and an oil passage (33) communicating with each other, and the centers of both the cooling water inlet / outlet pipes (60) and the oil inner pipe (51) of the double-tube oil cooler (50) coincide with each other. Cross-sectional area (SA) of the oil inner pipe (51) of the double pipe type oil cooler (50) inserted through the insertion hole (32)
And the total cross-sectional area (SC) of the cooling water passage (34),
An aluminum oil cooler for automobiles, which has a ratio of 1: 0.5 to 1: 1.4. 2. The cross-sectional area (SA) of the oil inner pipe (51) of the double-tube oil cooler (50) inserted into the oil inner pipe insertion hole (32) and the total cross-sectional area of the cooling water passage (34). (S
The aluminum oil cooler for an automobile according to claim 1, wherein the sum of (C) is equal to or larger than the water inlet / outlet passage sectional area (SB) of the cooling water inlet / outlet pipe (60).