JPH07280468A - Water-cooled oil cooler - Google Patents

Abstract

PURPOSE:To improve a heat exchanging efficiency by a simple structure by forming an inlet reservoir chamber communicating with one end side of an oil passage and an outlet reservoir chamber communicating with the other end side, and providing an inlet pipe connected to the inlet chamber and an outlet pipe connected to the outlet chamber CONSTITUTION:Oil liquid introduced from, an inlet pipe 35 to an inlet reservoir chamber 33 is fed through a spiral oil passage 30 along a guide plate 32 to an outlet reservoir chamber 34, guided from an outlet pipe 36 and circulated in a hydraulic circuit. Cooling water introduced from an inlet 26a in an inner pipe 26 is fed through a cooling water passage 31, and guided from an outlet 26b, and circulated in a cooling system. The oil in the passage 30 is heat exchanged with cooling water in the passage 31 through a tube wall of the pipe 26 and the plate 32 to be cooled. Since a groove 37 is formed at a tube wall of the pipe 26, a contact area of the oil with the water is increased to increase an exchanging heat quantity, thereby improving a cooling efficiency.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-cooled oil cooler for cooling an oil liquid such as hydraulic oil of an automatic transmission of an automobile.

[0002] Generally, an oil cooler is provided in a hydraulic circuit of an automatic transmission of an automobile in order to cool working oil such as a torque converter. As an oil cooler of this type, for example, as shown in FIG. 7, a water-cooled oil cooler 3 built in a lower tank 2 of an engine cooling radiator 1 is known. In FIG. 7, 4 is an upper tank,
Reference numeral 5 is a radiator core, 6 is a radiator cap, 7 is a cooling water inlet, and 8 is a cooling water outlet.

As shown in FIGS. 8 and 9, a water-cooled oil cooler 3 has a cylindrical outer pipe 10 on the outer periphery of a cylindrical inner pipe 9 having both ends closed and an oil liquid passage 9a formed therein. Provided with inner pipe 9 and outer pipe
It has a double pipe structure in which a cooling water passage 10a is formed between the cooling water passage 10a and the cooling water passage 10. At both ends of the inner pipe 9, the outer pipe
An inlet pipe 11 and an outlet pipe 12 penetrating the pipe wall of 10 are connected, and a cooling water inlet 13 and a cooling water outlet 14 are formed at both ends of the outer pipe 10. Further, cooling fins 15 are provided on the inner peripheral portion of the wall of the inner pipe 10.

The inlet pipe 11 and the outlet pipe 12 are connected to a hydraulic circuit (not shown) of the automatic transmission, and the cooling water inlet 13 and the cooling water outlet 14 are connected to a cooling water passage (not shown) of the radiator 1. )It is connected to the. Then, the hydraulic fluid (about 110 ° C.) of the automatic transmission is circulated to the oil liquid passage 9a in the inner pipe 9 through the inlet pipe 11 and the outlet pipe 12, and the engine cooling water (80 Cooling water inlet 13 and cooling water outlet
The hydraulic oil is circulated to the cooling water passage 10a in the outer pipe 10 via 14 and heat-exchanged via the pipe wall of the inner pipe 9 and the cooling fins 15 to cool the working oil.

In addition, as a water-cooled oil cooler,
For example, as shown in FIG. 10, there is one that is mounted on an oil filter mounting portion (not shown) of an engine to cool the engine lubricating oil. As shown in FIG. 10, the oil cooler 16 includes a core 19 having an annular lubricating oil passage 17 and a cooling water passage 18, which are laminated (four layers) to supply lubricating oil to a lubricating oil inlet 20 and a lubricating oil outlet (not shown). ) To the lubricating oil passage 17, and the cooling water is supplied to the inlet pipe 21 and the outlet pipe.
The lubricating oil is circulated through the cooling water passage 18 via 22 and exchanges heat to cool the lubricating oil. A cooling fin 23 is provided in the lubricating oil passage 17 in order to increase the amount of heat exchanged.

[0006]

However, in the conventional water-cooled oil cooler 3 having a double pipe structure shown in FIGS. 7 to 9, it is necessary to reduce the size in order to store it in the lower tank 2 of the radiator 1. In order to increase the cooling efficiency, cooling fins 15 are provided on the inner peripheral portion of the inner wall of the inner pipe 9. Therefore, there is a problem that the number of parts increases, the structure becomes complicated, and the number of assembling steps and the manufacturing cost increase. Further, the oil cooler 16 shown in FIG. 10 also has a similar problem because it has a large number of parts and a complicated structure because a plurality of cores 19 provided with the cooling fins 23 are laminated.

The present invention has been made in view of the above points, and an object thereof is to provide a water-cooled oil cooler having a simple structure and excellent heat exchange efficiency.

[0008]

In order to solve the above-mentioned problems, a water-cooled oil cooler according to a first aspect of the invention has a cylindrical outer pipe whose both ends are closed in a pipe wall in a substantially axial direction. A groove is formed along the outer circumference of which a spiral guide plate is wound to insert a cylindrical inner pipe, and both ends are extended to the outside of the outer pipe, and a spiral is formed between the outer pipe and the inner pipe. -Shaped oil liquid passage, an inlet pool chamber communicating with one end side of the oil liquid passage, and an outlet pool chamber communicating with the other end side, and an inlet pipe and the outlet pool chamber connected to the inlet pool chamber It is characterized in that an outlet pipe connected to is provided.

The water-cooled oil cooler according to a second aspect of the present invention has a cylindrical outer pipe whose both ends are closed,
A spiral groove portion is formed on the pipe wall, and the both ends are extended to the outside of the outer pipe by inserting a cylindrical inner pipe around which a spiral guide plate having a U-shaped cross section is wound on the outer periphery, Between the outer pipe and the inner pipe,
The groove and the guide plate form a spiral oil liquid passage, and an inlet reservoir chamber communicating with one end side of the oil liquid passage and an outlet reservoir chamber communicating with the other end side are formed, and the inlet reservoir is formed. An inlet pipe connected to the chamber and an outlet pipe connected to the outlet reservoir chamber are provided.

[0010]

With this configuration, according to the water-cooled oil cooler of the first aspect, the cooling water is circulated through the inner pipe, and the inlet pipe and the outlet pipe pass through the inlet reservoir chamber and the outlet reservoir chamber. When the oil is circulated in the oil liquid passage, the cooling water and the oil exchange heat through the inner wall of the inner pipe and the guide plate, whereby the oil is cooled. At this time, since the spiral oil liquid passage is formed by the guide plate, the entire length of the oil liquid passage is sufficiently long and the oil is appropriately agitated.
The groove portion of the pipe wall of the inner pipe increases the contact area between the cooling water and the oil, and further, the inlet reservoir chamber and the outlet reservoir chamber make the oil flow in the oil passage uniform to increase the heat exchange amount.

Further, according to the water-cooled oil cooler of the second aspect, in addition to the above, the oil passage is formed by the guide plate having a U-shaped cross section and the spiral groove portion of the pipe wall of the inner pipe. As a result, the contact area between the cooling water and the oil increases, and the amount of heat exchanged increases.

[0012]

Embodiments of the present invention will now be described in detail with reference to the drawings.

The first embodiment will be described with reference to FIGS. 1 and 2. As shown in FIGS. 1 and 2, the water-cooled oil cooler 24 has a double pipe structure in which an inner pipe 26 is inserted into a cylindrical outer pipe 25, and both ends of the outer pipe 25 are covered with a lid member 28. , 29 are attached and closed, and both end openings of the inner pipe 26 penetrate the lid members 28, 29 and extend to the outside to form an inlet 26a and an outlet 26b. Then, the outer pipe 25 and the inner pipe 26
An oil liquid passage 30 is formed between the inner pipe 26 and the inner pipe 26, and a cooling water passage 31 is formed inside the inner pipe 26.

A spiral guide plate 32 is provided between the outer pipe 25 and the inner pipe 26. In addition, at both ends inside the outer pipe 25, the guide plates 32
Between the cover member and the lid members 28 and 29, an inlet pool chamber 33 and an outlet pool chamber
34 are formed. An inlet pipe 35 communicating with the inlet reservoir chamber 33 and an outlet pipe 36 communicating with the outlet reservoir chamber 34 are connected to the pipe walls at both ends of the outer pipe 25.

A plurality of groove portions 37 are formed on the pipe wall of the inner pipe 26 substantially along the axial direction. The groove 37 is
It may be formed in a spiral shape as shown by a chain double-dashed line in FIG. A spiral guide plate 32 is wound around the outer peripheral portion of the inner pipe 26, and the oil liquid passage 30 is spirally formed by the guide plate 32. The inlet reservoir chamber 33 is communicated with one end of the spiral oil liquid passage 30 and the outlet reservoir chamber 34 is communicated with the other end.

The guide plate 32 has a plurality of groove portions on the inner peripheral side.
It is fitted to 37 and joined to the inner pipe 26 so that heat can be easily transferred between the guide plate 32 and the inner pipe 26. Further, the guide plate 32 includes the lid member 28,
It is arranged separately from 29, and the volumes of the inlet reservoir chamber 33 and the outlet reservoir chamber 34 are sufficiently large with respect to the spiral oil liquid passage 30 formed by the guide plate 32.

Each member such as the outer pipe 25, the inner pipe 26, the guide plate 32, etc. is preferably made of an aluminum alloy or the like which has excellent thermal conductivity, is relatively inexpensive, and is easy to work, and is joined by brazing. Also, the guide plate 32
Can be formed into a spiral shape by joining a plurality of members formed in, for example, a substantially annular shape or an arc shape, and by using a material having a large ductility, the inner pipe can be integrally formed.
It can also be wrapped around 26.

The inlet pipe 35 and the outlet pipe 36 are connected to a hydraulic circuit (not shown) such as an automatic transmission, and an oil liquid such as hydraulic oil is introduced from the inlet pipe 35 into the inlet reservoir chamber 33, and the oil liquid passage 30 And is sent to the outlet pool chamber 34, and further circulated through the outlet pipe 36. Further, the inlet 26a and the outlet 26b of the inner pipe 26 are connected to a cooling system (not shown) such as an engine, and the cooling water is passed through the cooling water passage 31.
It is designed to circulate and circulate.

The operation of this embodiment having the above-mentioned structure will be described below.

The oil liquid introduced from the inlet pipe 35 into the inlet sump chamber 33 is a spiral oil liquid passage along the guide plate 32.
It flows through 30 and is sent to the outlet pool chamber 34, and is led out from the outlet pipe 36 and circulates in the hydraulic circuit. Further, the cooling water introduced into the inner pipe 26 from the inlet 26a flows through the cooling water passage 31, is led out from the outlet 26b, and circulates in the cooling system. Then, the oil liquid in the oil liquid passage 30 is cooled by exchanging heat with the cooling water in the cooling water passage 31 via the pipe wall of the inner pipe 26 and the guide plate 32.

At this time, the oil liquid is introduced and led out through the inlet reservoir chamber 33 and the outlet reservoir chamber 34 having a sufficiently large volume, so that the flow in the oil liquid passage 30 is made uniform. Further, the spiral guide plate 32 lengthens the entire length of the oil liquid passage 30 and generates an appropriate turbulent flow to stir the oil liquid. Further, since the groove portion 37 is formed in the pipe wall of the inner pipe 26, the contact area with the oil liquid and the cooling water is increased, the heat exchange amount is increased, and the cooling efficiency is improved.

Next, a second embodiment of the present invention will be described with reference to FIGS. The second embodiment is different from the water-cooled oil cooler 24 of the first embodiment only in the inner pipe and the guide plate. Therefore, the same members are designated by the same reference numerals and different parts will be described below. Only the details will be explained.

As shown in FIGS. 3 and 4, in the water-cooled oil cooler 38 of the second embodiment, a cylindrical inner pipe 39 is inserted into the outer pipe 25 so that the inlet 39a and the outlet 39b at both ends are exposed to the outside. A cooling water passage 31 is formed inside the inner pipe 39, and an oil liquid passage 30 is formed between the outer pipe 25 and the inner pipe 39.

A spiral groove 40 is formed on the wall of the inner pipe 39 located inside the outer pipe 25. A guide plate 41 having a substantially U-shaped cross section (see FIG. 5) is provided between the outer pipe 25 and the inner pipe 38, and is wound spirally along the groove 39 of the inner pipe 38. .

In the guide plate 41, one side 41a of the center of the U-shaped cross section faces the groove 40 and is joined to the outer peripheral portion of the pipe wall of the inner pipe 39, and the ends of the two sides 41a and 41b at both ends are the outer pipe. It is provided so as to contact the inner peripheral portion of the tube wall of 25. The guide plate 41 is provided with a flange portion 41d that comes into contact with the inner peripheral surface of the outer wall of the outer pipe 25 at the tip of one side 41c of the end portion of the U-shaped cross section.
The guide plates 41 are positioned in a spiral shape by abutting one side 41b of the end of the adjacent U-shaped cross section.

The oil passage 30 is formed in a spiral shape by the guide plate 41, and the passage 30a formed in the groove 40 of the inner pipe 39 and the U-shaped cross section of the guide plate 41 are formed inside. It is partitioned into three passages, a passage 30b formed and a passage 30c formed outside the U-shaped cross section of the guide plate 41. The guide plate 41 is provided with a cut-and-raised portion 42 having an opening for communicating the passage 30a and the passage 30b on one side of the center of the U-shaped cross section.
Further, a plurality of communication holes 43 for communicating the passage 30b and the passage 30c are provided on one side 41b of the end portion. As shown in FIG. 6, the guide plate 41 may be provided with a plurality of communication holes 44 instead of the cut-and-raised portions 42 for communicating the passages 30a and 30b.

Similar to the first embodiment, each member such as the outer pipe 25, the inner pipe 26, the guide plate 41, etc. is made of an aluminum alloy or the like which has excellent thermal conductivity, is relatively inexpensive and is easy to process, It is good to connect by brazing. The guide plate 41 can be formed in a spiral shape by joining a plurality of members formed in, for example, a semicircle, and by using a material having large ductility, the inner plate can be integrally formed.
It can also be wrapped around 39.

The operation of the second embodiment constructed as above will be described below.

Similar to the first embodiment, the oil liquid introduced from the inlet pipe 35 into the inlet sump chamber 33 is an oil liquid passage consisting of spiral passages 30a, 30b, 30c along the groove 40 and the guide plate 41. It flows through 30 and is sent to the outlet pool chamber 34, is led out from the outlet pipe 35, and circulates in the hydraulic circuit. Also, the entrance
The cooling water introduced from 39a into the inner pipe 39 flows through the cooling water passage 31, is led out from the outlet 39b, and circulates in the cooling system. Then, the oil liquid in the oil liquid passage 30 is cooled by exchanging heat with the cooling water in the cooling water passage 31 via the tube wall of the inner pipe 39 and the guide plate 41.

At this time, the flow of the oil liquid in the oil liquid passage 30 is made uniform by the inlet pool chamber 33 and the outlet pool chamber 34. The spiral groove 40 and the guide plate 41 increase the overall length of the oil liquid passage 30, and generate an appropriate turbulent flow to agitate the oil liquid. Cut-and-raised part 42 of guide plate 41
(Or the communication hole 44) and the communication hole 43
Since the passages 30a, 30b, 30c forming the passage are communicated with each other, the stirring of the hydraulic oil is smoothly performed. Further, since the groove portion 40 is formed in the pipe wall of the inner pipe 26 and the oil liquid passage 30 is partitioned by the guide plate 41 having a U-shaped cross section, the contact area with the hydraulic oil and the cooling water is reduced. As a result, the amount of heat exchanged is increased and the cooling efficiency of the oil liquid is improved.

In the first and second embodiments, no cooling fin is used, the structure is simple and the number of parts is small.
Since an inexpensive material such as an aluminum alloy can be used, the assembling work can be performed continuously from the brazing in the furnace, and the assembling man-hour and the manufacturing cost can be reduced. Further, it is possible to reduce the size and weight by improving the cooling efficiency and using a lightweight material such as an aluminum alloy.

[0032]

As described above in detail, in the water-cooled oil cooler according to the first aspect of the present invention, since the spiral oil liquid passage is formed by the guide plate, the total length of the oil liquid passage becomes sufficiently long and the oil Is moderately agitated, the contact area between the cooling water and oil is increased by the groove on the inner wall of the inner pipe, and the oil flow in the oil passage is made uniform by the inlet and outlet collection chambers for replacement. The amount of heat increases. Further, according to the water-cooled oil cooler of claim 2, in addition to the above, the oil liquid passage is formed by the guide plate having a U-shaped cross section and the spiral groove portion of the pipe wall of the inner pipe. The contact area between the cooling water and the oil increases, and the amount of heat exchanged increases. As a result, the cooling efficiency can be improved. Further, since the cooling fin is not used, the structure is simple and the number of parts is small, there is an excellent effect that the number of assembling steps and the manufacturing cost can be reduced.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a side surface of a first embodiment of the present invention.

FIG. 2 is a vertical sectional view taken along the line AA of FIG.

FIG. 3 is a vertical sectional view of a side surface of a second embodiment of the present invention.

4 is a vertical cross-sectional view taken along the line BB of FIG.

5 is a vertical cross-sectional view of the guide plate of the device of FIG.

6 is a longitudinal sectional view of another embodiment of the guide plate of the apparatus of FIG.

FIG. 7 is a front view of a radiator having a conventional water-cooled oil cooler with a double-pipe structure.

8 is a side view of the water-cooled oil cooler of the apparatus of FIG.

9 is a vertical cross-sectional view taken along the line CC of FIG.

FIG. 10 is a vertical cross-sectional view of a side surface of a water-cooled oil cooler mounted on an oil filter mounting portion of an engine.

[Explanation of symbols] 24 Water-cooled oil cooler 25 Outer pipe 26 Inner pipe 30 Oil passage 32 Guide plate 33 Inlet pool chamber 34 Outlet pool chamber 35 Inlet pipe 36 Outlet pipe 37 Groove 38 Water-cooled oil cooler 39 Inner pipe 40 Groove 41 Guide plate

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[Procedure amendment]

[Submission date] June 1, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0001

[Correction method] Change

[Correction content]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-cooled oil cooler for cooling an oil liquid such as hydraulic oil of an automatic transmission of an automobile.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] 0002

[Correction method] Change

[Correction content]

In general, an oil cooler is provided in a hydraulic circuit of an automatic transmission of an automobile to cool working oil such as a torque converter. As an oil cooler of this type, for example, as shown in FIG. 7, a water-cooled oil cooler 3 built in a lower tank 2 of an engine cooling radiator 1 is known. In FIG. 7, 4 is an upper tank,
Reference numeral 5 is a radiator core, 6 is a radiator cap, 7 is a cooling water inlet, and 8 is a cooling water outlet.

[Procedure 3]

[Document name to be amended] Statement

[Name of item to be corrected] 0003

[Correction method] Change

[Correction content]

As shown in FIGS. 8 and 9, the water-cooled oil cooler 3 has a cylindrical outer pipe 10 on the outer periphery of a cylindrical inner pipe 9 having both ends closed and an oil liquid passage 9a formed therein. A cooling water passage 10a is provided between the inner pipe 9 and the outer pipe 10 ,
It has a double pipe structure in which a cooling water passage 10b is formed inside the pipe 9 . An inlet pipe 11 and an outlet pipe 12 penetrating the wall of the outer pipe 10 are connected to both ends of the inner pipe 9, and a cooling water inlet 13 and a cooling water outlet 14 are formed at both ends of the outer pipe 10. There is. A cooling fin 15 is provided on the inner peripheral portion of the inner wall of the inner pipe 9 .

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0004

[Correction method] Change

[Correction content]

The inlet pipe 11 and the outlet pipe 12 are
Connected to the hydraulic circuit of the automatic transmission (not shown),
The cooling water inlet 13 and the cooling water outlet 14 are connected to the radiator 1
Is connected to a cooling water passage (not shown). And
Inlet pipe 11 for hydraulic fluid (about 110 ° C) of automatic transmission
The engine cooling water (about 80 ° C.) which is circulated through the oil liquid passage 9 a in the inner pipe 9 via the outlet pipe 12 and the outlet pipe 12 and cooled by the radiator 2
And the cooling water passage inside the outer pipe 10 and the cooling water passage inside the inner pipe 9 via the cooling water outlet 14.
The working oil is circulated in the passage 10b and heat-exchanged through the wall of the inner pipe 9 and the cooling fins 15 to cool the working oil.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0018

[Correction method] Change

[Correction content]

[0018] The inlet pipe 35 and the outlet pipe 36 is self
It is connected to a hydraulic circuit (not shown) such as a dynamic transmission , introduces an oil liquid such as hydraulic oil into the inlet sump chamber 33 from the inlet pipe 35, circulates the oil liquid passage 30 and sends it to the outlet sump chamber 34,
Further, it is adapted to circulate through the outlet pipe 36. Further, the inlet 26a and the outlet 26b of the inner pipe 26 are connected to a cooling system (not shown) such as an engine, and the cooling water is circulated through the cooling water passage 31.

[Procedure correction 6]

[Document name to be amended] Statement

[Correction target item name] Figure 8

[Correction method] Change

[Correction content]

FIG. 8 is a conventional double pipe attached to a cooling water pipe of an engine .
It is a side view of the water-cooled oil cooler of a structure .

[Procedure Amendment 7]

[Document name to be corrected] Drawing

[Correction target item name] Figure 9

[Correction method] Change

[Correction content]

[Figure 9]

Claims (2)

[Claims] 1. A cylindrical inner pipe, in which a groove portion is formed along a pipe wall in a substantially axial direction and a spiral guide plate is wound around an outer periphery, is inserted into a cylindrical outer pipe whose both ends are closed. Then, both ends are extended to the outside of the outer pipe, and between the outer pipe and the inner pipe, a spiral oil liquid passage, an inlet reservoir chamber communicating with one end side of the oil liquid passage, and the other end side. And an outlet pipe connected to the inlet reservoir and an outlet pipe connected to the outlet reservoir, the water-cooled oil cooler. 2. A cylindrical outer pipe in which both ends are closed, a spiral groove is formed in the pipe wall, and a spiral guide plate having a U-shaped cross section is wound around the outer periphery of the cylindrical outer pipe. The inner pipe is inserted to extend both ends to the outside of the outer pipe, and the groove and the guide plate form a spiral oil liquid passage between the outer pipe and the inner pipe, and the oil liquid passage An inlet pool chamber communicating with one end side of the inlet and an outlet pool chamber communicating with the other end side thereof, and an inlet pipe connected to the inlet reservoir chamber and an outlet pipe connected to the outlet reservoir chamber are provided. A water-cooled oil cooler.