KR20070114873A - Heat exchanger for transmission oil of vehicle and process of the same - Google Patents

Abstract

A heat exchanger for transmission oil of a vehicle and a manufacturing method thereof are provided to connect an inlet pipe and an outlet pipe with a heat exchanger pipe without using nuts and washers. A radiator tank(20) is provided with a pair of fixing holes which are spaced apart from each other, and a pair of ring-shaped packing(40) are installed in the fixing holes. A heat exchanger pipe(60) is installed in the radiator tank, and a pair of connection caps(80) are connected to both ends of the heat exchanger pipes. An inlet pipe(100) is connected to a hole of the connection cap at one end of the heat exchanger pipe, and an outlet pipe(120) is connected to a hole of the connection cap at the other end of the heat exchanger pipe.

Description

Heat exchanger for automobile transmission oil and manufacturing method thereof {Heat Exchanger for Transmission Oil of Vehicle and Process of The Same}

1 is an exploded perspective view showing an embodiment of a heat exchanger for a vehicle transmission oil according to the present invention.

Figure 2 is an assembled cross-sectional view showing an embodiment of a heat exchanger for a vehicle transmission oil according to the present invention.

Figure 3 is a partially enlarged assembly cross-sectional view showing an embodiment of a heat exchanger for a vehicle transmission oil according to the present invention.

Figure 4 is an assembled cross-sectional view showing another embodiment of the inlet pipe and the outlet pipe in one embodiment of a heat exchanger for a vehicle transmission oil according to the present invention.

Figure 5 is an assembled cross-sectional view showing yet another embodiment of the inlet pipe and the outlet pipe in one embodiment of a heat exchanger for a vehicle transmission oil according to the present invention.

Figure 6 is an enlarged cross-sectional view showing another embodiment of the packing in one embodiment of a heat exchanger for a vehicle transmission oil according to the present invention.

Figure 7 is an enlarged cross-sectional view showing another embodiment of the packing in one embodiment of a heat exchanger for a vehicle transmission oil according to the present invention.

8 is an exploded perspective view showing another embodiment of the heat exchanger for a vehicle transmission oil according to the present invention.

9 is an assembled cross-sectional view showing another embodiment of the heat exchanger for a vehicle transmission oil according to the present invention.

10 is a partially enlarged assembled sectional view showing another embodiment of the heat exchanger for automobile transmission oil according to the present invention.

11 is a block diagram showing an embodiment of a method for manufacturing a heat exchanger for a vehicle transmission oil according to the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger for automotive transmission oils, and more particularly, to a heat exchanger for automotive transmission oils, which reduces the risk of corrosion that is likely to occur in the gaps between parts and enables free design of the size or structure of the radiator tank.

In general, a vehicle is provided with a heat exchanger such as an oil cooler (Oil Cooler) for cooling or heating the transmission oil to maintain a proper temperature for the smooth operation of the transmission oil.

The oil cooler is mainly inserted into the tank of the radiator is installed, the cooling of the transmission oil is made as the heat exchanger in contact with the cooling water inside the radiator.

Conventional oil cooler is a heat exchanger pipe is inserted into the radiator tank and the oil flow therein is formed therein and the inlet and outlet are formed at predetermined intervals, the inlet pipe is installed at the inlet of the heat exchanger pipe, It consists of an outlet pipe installed in the outlet of the heat exchange pipe.

The inlet pipe and the outlet pipe are installed to be approximately vertically connected to both end sides of the heat exchange pipe.

The inlet pipe and the outlet pipe as described above are exposed to the outside through through holes respectively formed in one side of the radiator tank and fixed to the radiator tank by using nuts and washers.

The conventional oil cooler configured as described above is exposed to the salinity, moisture, atmosphere, etc., because the exposed portion is exposed to the outside by the installation of nuts and washers on the outside of the radiator tank for fixing the inlet pipe and the outlet pipe, There is a high possibility of corrosion caused by salt, moisture and harmful components in the air in the gaps between the parts.

Therefore, the oil cooler and the radiator tank are provided with factors that reduce the service life such as damage and failure.

Furthermore, when the under cover installed in the lower part of the engine room of the vehicle is removed for reasons such as manufacturing cost reduction and fuel economy improvement of the automobile, there is a possibility of corrosion.

In addition, since the inlet and outlet pipes are inserted into the radiator tank while the inlet and outlet pipes are fixed to the heat exchange pipe, the oil cooler is limited in size and structure when designing a tank of the radiator such that the opening width of the radiator tank is large.

Therefore, the design of the radiator tank is difficult and it is not easy to change to a new structure or size.

In addition, since a relatively large number of parts are required for fixing the inlet and outlet pipes and maintaining the air tightness of the radiator tank, the manufacturing cost is increased.

An object of the present invention is to solve the above problems, by minimizing the number of parts exposed to the outside of the radiator tank, the number of parts is reduced while the risk of corrosion is eliminated, so as to extend the life and to reduce the production cost and productivity It is to provide a heat exchanger for automotive transmission oil which can be improved.

In addition, another object of the present invention is that the inlet pipe and the outlet pipe is connected by a fixed screw method can be designed in a variety of structures, such as miniaturization or slimming of the radiator tank, so that the production of heat exchanger for automotive transmission oil can be improved productivity and cost reduction It is to provide a method.

The heat exchanger for automobile transmission oil proposed by the present invention includes a radiator tank in which a pair of fixing holes are formed at predetermined intervals, a pair of ring-shaped packings respectively installed in the pair of fixing holes, and an inside of the radiator tank. A heat exchange pipe installed at an inner side of the heat exchange pipe and having a flow path through which oil moves, a pair of connection caps connected to both ends of the heat exchange pipe, respectively, and a connection hole formed therein, and the fixing at the outside of the radiator tank. An inlet pipe connected to a connection hole of a connection cap installed at one end of the heat exchange pipe through a hole and having a flange portion, and installed at the other end of the heat exchange pipe through the fixing hole from the outside of the radiator tank; Exit wave is connected to the connecting hole of the connecting cap and the flange portion is formed This is done, including if.

 In the radiator tank, a pair of assembling grooves may be formed around the fixing hole.

The packing is formed in a vertical portion provided on the inner surface of the fixing hole and bent outwardly from one end of the vertical portion, the flange portion in the periphery of the fixing hole and the inlet and outlet pipes on the outer surface of the radiator tank. A first contact part installed in close contact with the first contact part, and a first contact part formed by being bent outwardly from the other end of the vertical part and installed in close contact between the fixing hole and the connection cap on the inner side of the radiator tank. It is made of wealth.

In the packing, a pair of assembling protrusions, which are assembled to the assembling grooves of the radiator tank, may be formed on surfaces of the first and second contacting portions facing each other.

In the inlet pipe and the outlet pipe, the flange portion may be formed integrally with each of the first supporting protrusions that surround the outer side of the packing and protrude toward the radiator tank.

In the connection cap, it is also possible to form a single body around the connection hole to surround the outer side of the packing, and each of the second support protrusions protruding toward the radiator tank.

Instead of the first support protrusion and the second support protrusion, it is also possible that a pair of support protrusions are formed around the fixing hole of the radiator tank, respectively.

The heat exchange pipe includes an inner tube formed in a cylindrical shape and a cylindrical outer shape formed to have a larger diameter than the inner tube and installed to surround the outer circumferential surface of the inner tube at a predetermined interval.

A core is installed between the inner tube and the outer tube.

In the central portion of the connecting cap is formed a through hole for inserting and fixed to both ends of the inner tube respectively, and the communication hole for connecting the connecting hole and the space between the inner tube and the exterior in the heat exchange pipe around the through hole Is formed.

 The connection hole of the connection cap and one end of the inlet pipe and the outlet pipe are respectively screwed together.

In the present invention, the inner tube may be formed longer than the outer tube in the heat exchange pipe, and the inner tube and the outer tube may be inserted into and fixed in the connection cap, and a through hole formed of a small diameter portion and a large diameter portion may be formed.

The inner tube is inserted and fixed to the small diameter portion, and the outer appearance is inserted and fixed to the large diameter portion, and the connection hole is formed at one side.

In addition, the present invention proposes a method for manufacturing a heat exchanger for a transmission oil for a vehicle, the tank forming step of forming a radiator tank having a pair of fixed holes by injection molding, and after forming an inner tube and an outer tube and a core, a core between the inner tube and the outer tube. A first assembly step of assembling the heat exchange pipe by installing a second assembly step, and a second assembly step of assembling the connection caps at both ends of the heat exchange pipe after forming a connection cap to form a connection hole in which a female screw part is formed at one side. And a brazing step of integrally fixing the inner tube, the exterior and the core in the heat exchange pipe through brazing, and integrally fixing both ends and the connection cap of the inner tube and the exterior, and an inlet having a male screw portion formed at one end thereof, respectively. An inlet and outlet forming step of forming a pipe and an outlet pipe, respectively; and in a fixing hole of the radiator tank. A packing installation step of installing a pair of packings respectively, and a coupling step of coupling the male threaded portions of the inlet pipe and the outlet pipe to the connection hole female threaded portion of the connection cap by passing the packing from the outside of the radiator tank. Is done.

Next, a preferred embodiment of a heat exchanger for a vehicle transmission oil and a method of manufacturing the same according to the present invention will be described in detail with reference to the accompanying drawings.

First, an embodiment of a heat exchanger for an automotive transmission oil according to the present invention is a radiator tank 20 in which a pair of fixing holes 12 are formed at predetermined intervals, respectively, as shown in FIGS. A pair of ring-shaped packings 40 respectively provided in the fixing holes 10 of the heat exchanger, heat exchange pipes 60 installed in the radiator tank 10, and both ends of the heat exchange pipes 60. A pair of connection caps 80 connected to each other and installed at one side, and a connection hole 86 is formed at one side thereof, and a connection hole 86 of the connection cap 80 installed at one end of the heat exchange pipe 60. And the inlet pipe 100 having the flange portion 102 formed thereon, and the connecting hole 82 of the connection cap 80 installed at the other end of the heat exchange pipe 60, and the flange portion 122 being connected to the inlet pipe 100. The outlet pipe 120 is formed.

The radiator tank 20 is made of a synthetic resin like the radiator tank which is generally widely used.

The packing 40 is formed in a ring shape having a cross-section having an approximately "c" shape so as to surround a corner of the fixing hole 22 of the radiator tank 20.

The packing 40 is perpendicular to the vertical portion 42 which is installed to contact the inner surface of the fixing hole 22 and along the plate surface around the fixing hole 22 at one end of the vertical portion 42. The first contact portion 44 formed by bending toward the second contact portion 46 formed by bending at an approximately right angle along the plate surface around the fixing hole 22 at the other end of the vertical portion 42. )

The first contact portion 44 is formed on the outer surface of the radiator tank 20 by the flanges 102 and 122 around the fixing hole 22 and in the inlet pipe 100 and the outlet pipe 120. ) Are installed in close contact with each other.

The flanges 102 and 122 of the inlet pipe 100 and the outlet pipe 120 are formed in the radiator tank 20 with the peripheral portions of the fixing holes 22 interposed therebetween.

The second close contact portion 46 is installed in close contact with each other between the fixing holes 102 and 122 and the pair of connecting caps 80 on the inner surface of the radiator tank 20.

As shown in FIG. 6, a pair of assembling protrusions 45 and 47 may be formed on the surfaces of the first and second contact portions 44 and 46, which face each other.

When the assembling protrusions 45 and 47 are formed as described above, in the radiator tank 20, a pair of assembling grooves in which the assembling protrusions 55 and 57 are assembled around the fixing hole 22 ( 25) and 27 are formed respectively.

As shown in FIG. 7, the packing 50 may be disposed inside the fixing hole 22 to perform airtight holding.

For example, the packing 50 has a connection portion 52 formed at a predetermined distance from the inner surface of the fixing hole 22 and a state in which both ends of the connection portion 52 are kept at a predetermined distance from each other. The edges extending and formed in contact with the inner surface of the fixing hole 22 and the outer surface thereof are connected to the flange portions 102 and 122 of the inlet pipe 100 and the outlet pipe 120 and the connection caps. It is also possible to include a pair of close contact portions 56 which are in contact with the peripheral surface of the connection hole 86 of 80, respectively.

The heat exchange pipe 60 installed in the radiator tank 20 is formed to have a larger diameter than the inner tube 62 and the inner tube 62 and surrounds the outer circumferential surface of the inner tube 62 at a predetermined interval. It consists of an appearance 64 to be installed.

The inner tube 62 and the outer tube 64 are formed using a cylindrical aluminum pipe and are formed to be formed long along the longitudinal direction of the radiator tank 20.

An aluminum core 66 is installed between the inner tube 62 and the outer shell 64 in the same manner as is generally used for an oil cooler.

The inner tube 62, the outer shell 64, and the core 66 are integrally fixed through brazing.

Although the inner tube 62, the outer shell 64, and the core 66 have been described as being made of aluminum, the present invention is not limited thereto, and may be made of copper, stainless steel, synthetic resin, or the like.

In the heat exchange pipe 60 as described above, the transmission oil is transferred between the inner tube 62 and the outer shell 64. The coolant is transferred to the inner side of the inner tube 62 and the outer side of the outer side 64.

The space between both ends of the inner tube 62 and the outer end 64 is sealed by installing the connecting cap 80.

In the connection cap 80, a through hole 82 through which the coolant passes is formed at the center portion, and both ends of the inner tube 62 are inserted into one end of the through hole 82, respectively, by welding or the like. It is fixed integrally.

A communication hole 84 is formed around the through hole 82 to connect the space between the inner tube 62 and the exterior 64 and the connection hole 86 in the heat exchange pipe 60.

The connection hole 86 is screwed to one end of the inlet pipe 100 and the outlet pipe 120, respectively. For example, male threaded portions 107 and 127 are formed at one end of the inlet pipe 100 and outlet pipe 120, and the male threaded portion is formed at the connection hole 86 of the connection cap 80. Female threaded portions 87 which are coupled to 107 and 127 are formed, respectively.

The connection hole 86 is formed to protrude in a boss shape at a predetermined height from one side of the connection cap 80.

Although not shown in the drawing, the connection cap 80 may be provided with a male thread portion, and the inlet pipe 100 and the outlet pipe 120 may be formed with a female thread portion coupled with the male thread portion.

The connection cap 80 as described above may be made of the same material as the heat exchange pipe 60 (for example, aluminum, copper, stainless steel, synthetic resin, etc.).

The inlet pipe 100 and the outlet pipe 120 are installed outside the radiator tank 20, and one end thereof is connected to the connection hole 86 of the connection cap 80 through the fixing hole 22. do.

The portion of the inlet pipe 100 and the outlet pipe 120 that is exposed to the outside of the radiator tank 20 is a hose for connection with a vehicle transmission, like the inlet pipe and the outlet pipe which are generally widely used (not shown in the drawings). And the like).

Since the inlet pipe 100 and the outlet pipe 120 as described above are always exposed to the outside, the risk of corrosion is easily exposed, so the material having excellent corrosion resistance against salt, moisture, and harmful components in the air (for example, copper Or stainless steel, synthetic resin, etc.).

In the inlet pipe 100 and the outlet pipe 120 may be made of the same material as the heat exchange pipe 60 or the connection cap 80, in the case of a material having a relatively low corrosion resistance coating to compensate for this. It can also be used.

In the flange portions 102 and 122 of the inlet pipe 100 and the outlet pipe 120 as described above, the outer circumferential surface blocks the space generated between the fixing holes 22 of the radiator tank 20 and the It is in close contact with the packing 40.

As shown in FIG. 4, in one embodiment of the heat exchanger for an automotive transmission oil according to the present invention made as described above, the flanges 102 and 122 of the inlet pipe 100 and the outlet pipe 120 are described above. The first support protrusions 103 and 123 protruding toward the radiator tank 20 are integrally formed, respectively, and the second support protruding toward the radiator tank 20 on one side of the pair of connection caps 80. It is also possible for the protrusions 83 to be formed integrally with each other.

In the above, the first supporting protrusions 103, 123 and the second supporting protrusions 83 are formed in a ring shape to surround the outer side of the packing 40.

In the heat exchanger for a vehicle transmission oil according to an embodiment of the present invention made as described above, as shown in FIG. 5, the radiator tank 20 is fixed instead of the first support protrusion 103 and the first support protrusion 123. It is also possible for the pair of support protrusions 23 to surround the outside of the packing 40 around the hole 22 to be integrally formed.

The support protrusion 23 is formed to protrude toward the flange portions 102, 122 and the connection cap 80 of the inlet pipe 100 and the outlet pipe 120, respectively.

And another embodiment of the heat exchanger for a vehicle transmission oil according to the present invention as shown in Figures 8 to 10, the heat exchange pipe 70 has an inner tube 72 is formed longer than the appearance 74, the connection cap ( The inner tube 72 and the outer tube 74 are inserted into and fixed to the 90, and the through connecting holes 92 formed of the small diameter portion 93 and the large diameter portion 94 are formed.

In the heat exchange pipe 70, the exterior 74 is formed to have a larger diameter than the inner tube 72 and is installed to surround the outer circumferential surface at predetermined intervals except for both ends of the inner tube 72.

The inner tube 72 is inserted into the small diameter portion 93 and fixed through welding or the like.

One side of the large diameter portion 94 is formed with a connection hole 96 connected to one end of the inlet pipe 100 and the outlet pipe 120.

The connection hole 96 can be implemented in the same configuration as the connection hole 86 of the above-described embodiment.

In the above, both ends of the exterior 74 are inserted into one end of the connection hole 96 and are integrally fixed by welding or the like.

In the above, the small diameter portion 93 is formed with a diameter approximately the same as the outer diameter of the inner tube 72, the large diameter portion 94 is formed with a diameter of the same size as the outer diameter of the outer appearance (74).

In the other embodiment of the heat exchanger for a vehicle transmission oil according to the present invention described above it can be carried out in the same configuration as the embodiment of the heat exchanger for a vehicle transmission oil, except for the above configuration, and a detailed description thereof will be omitted.

And one embodiment of the heat exchanger manufacturing method for a vehicle transmission oil according to the present invention, as shown in Figures 1 to 3 and 11, the tank forming step (P10) to form the radiator tank 20, and the heat exchange pipe The first assembly step (P20) for assembling (60), and the second assembling step (P30) for assembling at both ends of the heat exchange pipe 60 after forming the connection cap 80, and the heat exchange Brazing step (P40) for integrally fixing the pipe 60 and the connection cap 80, the inlet and outlet forming step (P50) for forming the inlet pipe 100 and the outlet pipe 120, respectively, and the radiator tank ( Packing installation step (P60) for installing each of the ring-shaped packing 40 in the fixing hole 22 of the 20, and the inlet pipe 100 and the outlet pipe 120 and the connecting cap 80 to couple It comprises a coupling step (P80).

In the tank forming step (P10), the radiator tank 20 is formed by injection molding.

In the first assembling step (P20), the inner tube 62, the outer tube 64, and the core 66 are formed, respectively, and a core 66 is installed between the inner tube 62 and the outer shell 64.

When the connection cap 80 is formed in the second assembling step P30, a connection hole 86 having a female screw part 87 is formed at one side of the connection cap 80.

In the brazing step P40, the heat exchange pipe 60 and the connection cap 80 are passed through a brazing furnace and fixed integrally.

That is, the heat exchange pipe 60 and the connection cap 80 are assembled through a brazing furnace to fix the inner tube 62, the exterior 64, and the core 66 integrally in the heat exchange pipe 60. Both ends of the inner tube 62 and the exterior 64 and the connection cap 80 is integrally fixed.

In the inlet and outlet forming step (P50), the male screw portion 107, 127 is formed at one end of the inlet pipe 100 and the outlet pipe 120, respectively.

In the packing installation step (P60) it is possible to install the packing 40 to surround the corner of the fixing hole 22 or to be installed on the inner surface of the fixing hole 22.

In the coupling step (P70), the heat exchange pipe 60 and the connection cap 80 is located inside the radiator tank 20 and the inlet pipe 100 and the outlet pipe 120 are outside the radiator tank 20. Through the packing 40 from the side is screwed with the female screw portion 87 formed in the connection hole 86 of the male screw portion 107, 127 and the connecting cap 80.

In the above, a preferred embodiment of a heat exchanger for a vehicle transmission oil and a method for manufacturing the same according to the present invention have been described, but the present invention is not limited thereto, and various modifications are made within the scope of the claims and the detailed description of the invention and the accompanying drawings. It is possible to carry out by way of example, which also falls within the scope of the present invention.

According to the heat exchanger for automobile transmission oil according to the present invention made as described above, since the nut and washer for fixing the inlet pipe and the outlet pipe are not necessary, the number of parts exposed to the outside of the radiator is reduced.

Therefore, the risk of corrosion is reduced by reducing the gap where salinity or moisture is likely to remain, and thus the possibility of defects such as product failure or breakage is lowered and the service life is extended.

In addition, since the inlet pipe and the outlet pipe are screw-connected with the connection cap in a state where the inlet pipe and the outlet pipe are installed outside the radiator tank, the inlet pipe and the outlet pipe are fixed to the radiator tank in a state in which the inlet pipe and the outlet pipe are integrally fixed to the heat exchange pipe. Design becomes easy and simple.

In other words, since the heat exchange pipe and the connection cap are inserted through the opening of the radiator tank, there is no part protruding to the side of the heat exchange pipe so that the width of the tank of the radiator can be reduced.

Therefore, it is not necessary to manufacture a radiator tank larger than necessary, and it becomes possible to miniaturize and slim down.

According to the heat exchanger for an automobile transmission oil according to the present invention, the inlet pipe and the outlet pipe and the connection cap is screwed to each other connected to each other fixed to the radiator tank and the number of parts is reduced by maintaining the airtightness of the radiator tank by the packing to reduce the manufacturing cost This is possible.

Furthermore, it is possible to improve productivity since manufacturing processes such as connection and assembly of each component are reduced.

According to the heat exchanger for a vehicle transmission oil according to the present invention, since the parts installed inside the radiator tank use a material having a relatively low price, such as aluminum, and the parts installed exposed to the outside use various materials having high corrosion resistance, It is possible to overcome the limitations of weight reduction and cost reduction.

Claims (10)

A radiator tank in which a pair of fixing holes are formed at predetermined intervals, A pair of ring-shaped packings respectively installed in the pair of fixing holes, Is installed inside the radiator tank and a flow path for oil movement therein is formed and the heat exchange pipe, A pair of connection caps installed at both ends of the heat exchange pipe and having connection holes formed at one side thereof, An inlet pipe connected to a connection hole of a connection cap at one end of the heat exchange pipe through the fixing hole at an outer side of the radiator tank, and having a flange portion; And an outlet pipe connected to a connection hole of a connection cap installed at the other end of the heat exchange pipe through the fixing hole at an outer side of the radiator tank and having a flange portion. The method according to claim 1, The packing is formed vertically installed on the inner surface of the fixing hole and bent at an angle from one end of the vertical portion to the outside, and around the fixing hole and the inlet and outlet pipes on the outer surface of the radiator tank. A first contact part installed in close contact with the flange part, and bent at an angle from the other end of the vertical part to the outside at an angle, and installed in close contact with the fixing hole and the connection cap on the inner side of the radiator tank. Heat exchanger for a vehicle transmission oil consisting of a second contact portion to be. The method according to claim 2, In the radiator tank, a pair of assembling grooves are formed around the fixing hole, The heat exchanger for an automotive transmission oil in the packing is provided with a pair of assembling projections are assembled to the assembly grooves of the radiator tank, respectively, on the surfaces facing each other the first and second contact portion. The method according to claim 1, The packing may be formed at a predetermined distance from the inner surface of the fixing hole, and at both ends of the connecting portion, each side of which is formed to extend and maintains a predetermined distance from each other, the inner surface of the fixing hole. And a pair of closely contact portions each of which is in contact with the outer surface of the inlet pipe and the outlet pipe and the flange portion of the inlet pipe and the outlet pipe, and the surface of the connecting hole of the connecting cap, respectively. The method according to claim 1, In the inlet pipe and the outlet pipe, the flange portion is formed integrally with each of the first supporting protrusions which surround the outer side of the packing and protrude toward the radiator tank. The heat exchanger for an automotive transmission oil in the connection cap is formed around the connection hole, each of which is formed integrally with a second support protrusion protruding toward the radiator tank. The method according to claim 1, The radiator tank heat exchanger for a vehicle transmission oil is formed around the fixing hole formed around the outside of the packing and a pair of support protrusions protruding toward the flange and the connecting cap of the inlet pipe and the outlet pipe, respectively. The method according to claim 1, The heat exchange pipe includes an inner tube formed in a cylindrical shape, a larger diameter than the inner tube, a cylindrical outer shape installed to cover the outer circumferential surface of the inner tube at a predetermined interval, and a core installed between the inner tube and the outer tube. and, The connecting cap has a through hole in which both ends of the inner tube are inserted into and fixed to a central portion thereof, and a communication hole connecting the connecting hole and the space between the inner tube and the exterior of the heat exchange pipe is formed around the through hole. Heat exchanger for automotive transmission oil formed. The method according to claim 1, The heat exchange pipe includes an inner tube formed in a cylindrical shape and a cylindrical outer shape formed to have a larger diameter than the inner tube and installed to surround the inner tube at predetermined intervals except for both ends thereof. The connecting cap is formed by penetrating the center portion of the through-hole connecting the inner tube and the exterior is inserted and the connection hole is formed on one side, The through connection hole is a heat exchanger for a vehicle transmission oil consisting of a small diameter portion to which both ends of the inner tube are respectively inserted and fixed, and a large diameter portion to which both ends of the exterior are respectively inserted and fixed to one end and connected to the connection hole. group. The method according to claim 1, The connection hole of the connection cap and the inlet pipe and the outlet pipe are respectively screwed heat exchanger for a transmission oil. A tank forming step of forming a radiator tank in which a pair of fixing holes are formed by injection molding; A first assembling step of assembling a heat exchange pipe by installing a core between the inner tube and the outer body after forming the inner tube and the outer body and the core; A first assembling step of assembling the connection caps at both ends of the heat exchange pipe after forming a connection cap such that a connection hole formed with a female thread is formed at one side; A brazing step of integrally fixing the inner tube, the outer tube and the core in the heat exchange pipe through brazing and integrally fixing both ends and the connection cap of the inner tube and the outer tube; An inlet and outlet forming step of forming an inlet pipe and an outlet pipe, each of which has an external thread formed at one end thereof; A packing installation step of installing a pair of ring-shaped packings in the fixing holes of the radiator tank; And a coupling step of engaging the male threaded portion of the inlet pipe and the outlet pipe through the packing from the outside of the radiator tank and engaging with the female threaded portion of the connection hole of the connection cap.

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