KR100681291B1 - Structure for connecting pipe connector to oil cooler contained aluminum radiator - Google Patents

Abstract

The present invention provides a pipe connector connection structure of an oil cooler built in an aluminum radiator, in particular, an oil cooler that can easily perform a connection operation between an oil cooler and a pipe connector, and can also improve the leakage preventing effect of transmission oil and cooling water. Disclosed is a pipe connector connection structure. According to the present invention, both of the outer pipe 62 of the oil cooler 60 communicates with the oil flow path of the oil cooler, and an inner thread is formed on the inner circumferential surface thereof, and a support rib 65 is formed on the outer circumferential surface to be in close contact with the inner wall surface of the lower header tank. The bosses 64 are each formed. In the pipe connector, a male thread portion and an end portion of the pipe connector which are engaged with the female thread portion are bent toward the outer wall surface of the lower header tank on the outer circumferential surface of one end thereof so as to contact the outer wall surface of the lower header tank. A clad ring 80 is interposed between the outer wall surface of the lower header tank and the inner surface of the joining rib, and the lower header tank 20, the boss 64, and the pipe are fused by brazing of the clad ring 80. The contact portion of the connector 70 is joined in a liquid tight structure.

Oil Cooler, Radiator, Radiator, Oil Cooling, Transmission Oil

Description

STRUCTURE FOR CONNECTING PIPE CONNECTOR TO OIL COOLER CONTAINED ALUMINUM RADIATOR}

1 is a perspective view showing a part of the aluminum radiator to which the pipe connector connection structure of the oil cooler is applied according to the present invention;

2 is a cross-sectional view showing a pipe connector connection structure of an oil cooler embedded in an aluminum radiator according to the present invention;

3 is a cross-sectional view showing an example of a pipe connector connection structure of a conventional oil cooler, and

4 is a cross-sectional view showing another example of a pipe connector connection structure of a conventional oil cooler.

<Description of Symbols for Main Parts of Drawings>

20: lower header tank 60: oil cooler

61: inner tube 62: outer tube

63: Inner Pin 64: Boss

65: support rib 70: pipe connector

71: bonded rib 80: clad ring

The present invention relates to an oil cooler used for oil cooling of a vehicle transmission, and more particularly, to a pipe connector connection structure of an oil cooler integrally embedded in an aluminum radiator.

Since there are many mechanical friction parts in the transmission of automobiles, oil is put inside the transmission housing to promote lubrication of the mechanical friction parts. In this lubrication process, the transmission oil must be cooled because the temperature is increased by frictional heat, and when the temperature is increased, the viscosity decreases so that lubrication cannot be performed.

Oil cooler for cooling transmission oil can be divided into built-in oil cooler built in radiator and external oil cooler installed outside radiator. It is used.

The radiator built-in oil cooler is built in the lower header tank of the radiator, and is formed in the form of a double pipe having an inner tube, an outer tube, and an inner pin installed in an oil passage between the inner and outer tubes. The oil cooler also has two pipe connectors which are arranged on both sides of the oil passage through the lower header tank of the radiator. The oil inlet pipe and the oil outlet pipe connected to the transmission are connected to the pipe connector, respectively. Therefore, the oil discharged from the transmission flows into the oil passage of the oil cooler through the oil inlet pipe and the oil inlet pipe connector, flows through the oil passage, and then returns to the transmission through the oil outlet pipe connector and the oil outlet pipe. In this process, the heat of oil flowing through the oil channel is transferred to the cooling fins, and the heat transmitted to the cooling fins is cooled by the radiator and flows to the lower header tank, which is lost to the cooling water flowing around the outer tube and the inside of the inner tube. The oil passing through the oil cooler may be returned to the transmission in a cooled state.

As a representative of such a radiator built-in oil cooler, the thing of Unexamined-Japanese-Patent No. 5-163944 is mentioned. The oil cooler is to be built in the lower header tank made of a synthetic resin, in the prior art, a pipe connector connection structure in which the coupling between the pipe connector 120 and the oil cooler 110 in the lower header tank 100 of the radiator (See FIG. 3) and a pipe connector connection structure (see FIG. 4) in which the pipe connector 220 is coupled to the oil cooler 210 near the wall of the lower header tank 200 of the radiator.

In the former case, the connection between the pipe connector 120 and the oil cooler 110 is made in the lower header tank 100 to simplify the connection structure, while the pipe connector 120 is connected to the lower header tank 100. Since the portion that penetrates through has a liquid-tight structure through a post-processing process such as pressing, for example, there is a high possibility that the coolant flowing through the lower header tank 100 will leak. That is, due to the characteristics of the vehicle, the fluctuation of the radiator is severe, but the lower header tank 100 is made of synthetic resin, so the liquid-tight structure according to the above method is inevitably vulnerable to the fluctuation of the radiator. In addition, such a pipe connector connection structure cannot be employed at all in an oil cooler built in an aluminum radiator.

On the other hand, in the latter case, since many parts such as O-rings, flat washers, spring washers, and nuts are required to fix the oil cooler 210 to the lower header tank 200 in a liquid tight state, the connection work of the pipe connector 220 is required. This difficult, high production cost, and even more parts, oil leakage is likely to occur in the connection portion between the pipe connector 220 and the oil cooler 210.

The present invention has been made in view of the above-mentioned conventional problems, and can be easily connected to the pipe connector of the oil cooler, the oil embedded in the aluminum radiator which can also improve the leakage preventing effect of the transmission oil and cooling water. Its purpose is to provide a cooler pipe connector connection structure.

In order to achieve the above object, the present invention, the oil cooler made of a double pipe type having an inner pin installed in the lower header tank of the aluminum radiator and installed in the oil pipe between the inner tube, the outer tube and the inner and outer tubes. A pipe connector connection structure of an oil cooler embedded in an aluminum radiator for connecting a pipe connector connected to a transmission side oil inlet pipe and an oil outlet pipe through one wall of the lower header tank on both sides thereof: On both sides of the outer tube of the boss, which is in communication with the oil flow path of the oil cooler, the inner threaded surface is formed with a female thread, and the outer circumferential surface is formed with a support rib in close contact with the inner wall surface of the lower header tank; One end portion of each pipe connector is formed with a male screw portion engaged with the female screw portion, and an end portion thereof is bent toward an outer wall surface of the lower header tank to form a joining rib contacting the outer wall surface of the lower header tank; The clad ring is interposed between the outer wall surface of the lower header tank and the inner surface of the joining rib, and the contact parts of the lower header tank, the boss and the pipe connector are joined in a liquid-tight structure by fusion by brazing of the clad ring. It features.

According to the pipe connector connection structure of the oil cooler embedded in the aluminum radiator according to the present invention configured as described above, the installation of the oil cooler in the lower header tank so that the bosses are exposed to the outside of the lower header tank and the joint of the pipe connector Insert the clad ring into the rib, fasten the pipe connectors to the exposed bosses, and then braze the radiator assembly. As a result, a liquid-tight structure is achieved in which cooling water and oil do not leak.

Other features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings. Prior to this, the terms or words used in the present specification and claims are defined in the technical spirit of the present invention on the basis of the principle that the inventor can appropriately define the concept of the term in order to explain his invention in the best way. It must be interpreted to mean meanings and concepts.

1 shows an example of an aluminum radiator to which a pipe connector connection structure of an oil cooler according to the present invention is applied. The aluminum radiator is stacked between upper and lower header tanks 10 and 20, a plurality of tubes 30 connecting the upper and lower header tanks 10 and 20, and the tubes 30. The heat transfer fins 40 and both side plates 50 and 50 for reinforcing the outermost sides of the heat transfer fins 40 and the tubes 30 are provided. The upper header tank 10 is provided with a cooling water inlet 12 and a radiator cap 14, and the lower header tank 20 is provided with a cooling water outlet 22.

The lower header tank 20 of the radiator includes an oil cooler 60 for cooling the transmission oil, as shown, and an oil inlet pipe (not shown) for introducing transmission oil into the oil cooler 60. And two pipe connectors 70 and 70 for connecting an oil outlet pipe (not shown) to the oil cooler 60 through one wall surface of the lower header tank 20. That is, one of the two pipe connectors 70 and 70 is for introducing oil into the oil cooler 60 and the other is for draining oil from the oil cooler 60.

As shown in FIG. 2, the oil cooler 60 may have an inner pin 63 installed in an oil passage formed between an inner tube 61, an outer tube 62, and the inner and outer tubes 61 and 62. It has a, both between the inner tube 61 and the outer tube 62 is formed in the form of a closed double tube.

According to the present invention, the bosses 64 are provided at both sides of the outer tube 62 of the oil cooler 60 so as to communicate with the oil passage of the oil cooler 60. The boss 64 has a female thread formed on its inner circumferential surface, and its end is arranged to penetrate the wall surface of the lower header tank 20. In addition, a support rib 65 is formed on the outer circumferential surface of the boss 64 to be in close contact with the inner wall surface of the lower header tank 20.

Meanwhile, in order to allow the pipe connectors 70 to communicate with the oil passages of the oil cooler 60 by connecting the pipe connectors 70 to the bosses 64, the pipe connectors 70 in the present invention. The outer circumferential surface of one end portion is formed with a male screw portion that is engaged with the female screw portion of each boss 64 exposed to the outside of the wall surface of the lower header tank 20. In addition, one end portion of the pipe connector 70 is bent to the outer wall surface of the lower header tank 20 is bent end ribs 71 are formed in contact with the outer wall surface of the lower header tank (20).

The clad ring 80 is interposed between the outer wall surface of the lower header tank 20 and the inner surface of the joining rib 71, and the lower header tank 20 is fused by brazing of the clad ring 80. 20), the contacts of the boss 64 and the pipe connector 70 are joined to each other.

Next, a method of connecting the pipe connectors 70 to the oil cooler 60 by the pipe connector connection structure of the oil cooler built in the aluminum radiator according to the present invention will be described.

First, the oil cooler 60 is disposed inside the lower header tank 20 so that the bosses 64 of the oil cooler 60 are exposed to the outside of the lower header tank 20. Then, the clad ring 80 is inserted into the joining rib 71 of the pipe connector 70 (that is, the side facing the wall surface of the lower tank tank 20), and is exposed out of the wall surface of the lower header tank 20. The pipe connectors 70 are fastened to the bosses 64, respectively. When the pipe connector 70 is completely coupled to the boss 64, the clad ring 80 inserted inside the joining rib 71 is in close contact with the outer wall surface of the lower header tank 20, and the support rib of the boss 64 ( 65 is in close contact with the inner wall surface of the lower header tank 20. When the radiator assembly in which the oil coolers 60 and the pipe connectors 70 are assembled in the brazing furnace is brazed, the clad ring 80 inserted into the joining rib 71 is melted to lower the lower header tank 20. As the fluid cools and flows toward the contact portions of the oil cooler 60 and the pipe connector 70, the gaps of these contact portions are joined in a completely sealed state. Therefore, leakage of the cooling water and the oil in the brazing joint does not occur.

Then, the radiator is installed in the engine room and then the oil inlet pipe and the oil outlet pipe connected to the transmission side are connected to the pipe connectors 70 connected to the oil cooler 60.

In the pipe connector connection structure of the oil cooler built in the aluminum radiator according to the present invention configured as described above, the clad ring 80 is fitted inside the joining rib 71 of the pipe connector 70, the pipe connector 70 , The contact portion of the lower header tank 20, the boss 64 of the oil cooler 60, and the pipe connector 70 is formed by fusion of the clad ring 80. Since it is joined in a liquid-tight structure, the connection work with the pipe connector 70 can be easily performed as well as the leakage preventing effect of the transmission oil and cooling water can be improved.

In addition, since the contact portion of the lower header tank 20, the boss 64 of the oil cooler 60 and the pipe connector 70 is firmly bonded, the strength at this junction is increased, so that the durability of the radiator can be improved.

On the other hand, while the above has been shown and described with respect to preferred embodiments of the present invention, the present invention is not limited to the above-described embodiment, the field to which the invention belongs without departing from the spirit of the invention claimed in the claims below. Of course, anyone skilled in the art can make various modifications, as well as such modifications are within the scope of the claims.

Claims (1)

One side of the lower header tank on both sides of the oil cooler, which is formed in the lower header tank of the aluminum radiator and has a double pipe type having inner pins installed in the inner pipe, the outer pipe and the oil flow path formed between the inner and outer pipes. In the pipe connector connection structure of the oil cooler built in the aluminum radiator for connecting the pipe connector to the transmission side oil inlet pipe and the oil outlet pipe through the wall, respectively, On both sides of the outer tube of the oil cooler, bosses communicating with the oil flow path of the oil cooler and having a female thread portion formed on the inner circumferential surface thereof and supporting ribs adhered to the inner wall surface of the lower header tank on the outer circumferential surface thereof; One end portion of each pipe connector is formed with a male screw portion engaged with the female screw portion, and an end portion thereof is bent toward an outer wall surface of the lower header tank to form a joining rib contacting the outer wall surface of the lower header tank; The clad ring is interposed between the outer wall surface of the lower header tank and the inner surface of the joining rib, and the contact parts of the lower header tank, the boss and the pipe connector are joined in a liquid-tight structure by fusion by brazing of the clad ring. A pipe connector connection structure of an oil cooler embedded in an aluminum radiator.

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