KR20070058945A - Oil cooler for automatic transmission - Google Patents

Abstract

An oil cooler for automatic transmission is provided to reduce largely weight of a product by forming an internal pipe, an external pipe, an inner pin, and a boss with a stainless material. An internal pipe(24) is inserted into an external pipe(22). A space part is formed between the internal pipe and the external pipe. Both ends of the space part are sealed. An inner pin(28) is inserted into the space part. A tube and a boss(30) are formed at both ends of the external pipe in order to circulate oil. A copper-plated inner pin is attached between the internal pipe and the external pipe in order to braze inner and outer circumferential surfaces of the internal pipe and the external pipe by using copper composition as a welding material.

Description

Oil Cooler for Automatic Transmission {Oil Cooler for Automatic Transmission}

1 is a view showing an oil cooler for an automatic transmission in one embodiment of the present invention.

Figure 2 is a side cross-sectional view of the C-C of FIG.

3 is a side cross-sectional view of the D-D of FIG.

4 is a view showing another embodiment of the oil cooler for an automatic transmission of FIG.

5 is a side cross-sectional view of E-E of FIG.

6 is a side cross-sectional view of the F-F of FIG.

7 is a view showing an oil cooler of the automatic transmission according to the prior art.

8 is a side cross-sectional view of A-A of FIG.

9 is a side cross-sectional view of B-B of FIG. 8;

* Brief description of the symbols in the main part of the drawing *

20: Oil Cooler for Automatic Transmission

22: appearance pipe

24: inner pipe

26: Space part

28: inner pin

30: Boss

31: Copper plate

32: welding ring

The present invention relates to an oil cooler for an automatic transmission, and more particularly, using an inner pin mounted on a space portion between an inner pipe and an outer pipe as a stainless material, and copper plating on the inner pin to melt the plated copper during brazing welding. The present invention relates to an oil cooler for an automatic transmission in which a solid material is welded to the circumferential surfaces of an inner pipe and an outer pipe so that the work process can be improved and the quality and reliability of a product can be greatly improved.

In general, copper plating on stainless steel has been mainly used for building exterior materials, and our company has applied brazing welding to automotive parts using copper (cu) plated on stainless steel. In addition, if a thin copper plate is interposed inside and outside of the inner pin without brazing the inner pin, and the brazing is welded, the thin copper plate (0.02t) is melted inside and outside to weld the inner pipe and the outer pipe to each other.

In addition, stainless steel bosses mounted on both ends of the outer pipe are forged, processed, and then mounted, and all parts of the oil cooler are made of stainless steel, and brazing welding is performed using copper (CU) as a welding material. In addition, the stainless steel plate is drawn to the press, and the specification of the threaded processing of the screw part is also mounted, thereby lowering the manufacturing cost.

The present invention will be made clear that the present invention is an invention of utility model registration application No. 2002-0019957 and the utility model holder No. 2001-0000318 previously filed by the present applicant.

As is well known, automatic transmissions are generally used by selectively supplying hydraulic pressure to friction elements, such as clutches or brake members, which hold the rotating elements in a planetary gear set, thereby selectively operating any rotating element in a transmission composed of several gears. It is connected to the output shaft of the transmission and fixed to the case of the transmission, and the shift is automatically made according to the driving state of the vehicle (for example, the vehicle speed and the throttle valve open state).

The oil used in the automatic transmission transmits power in the torque converter of the automatic transmission, lubricates rotating elements such as gears and bearings, and hydraulic oil is used for various hydraulic mechanisms, that is, valves, clutches, and brakes. Cooling action is performed on each sliding part of the transmission, and is stored in the oil pan connected to the lower side of the transmission case and is supplied to various valve mechanisms and hydraulic operation elements through the oil pump.

Therefore, the oil acting as described above is very important to maintain the temperature below a certain temperature because it engages the clutch and lubricates and cools each part. In particular, the temperature of the oil has a great effect on the oil level. When the oil temperature increases, the oil level becomes high, and when the oil level increases, the oil amount becomes excessive and an overflow occurs, which causes the automatic transmission to smoothly. It did not work.

However, the conventional oil cooling device of the automatic transmission does not consider any of the above temperature characteristics, and after the inner pipe and the inner pipe are equipped with a component called inner pin, the inner pin is not welded with the inner and outer pipes, so cooling efficiency is improved. There was a problem of being lowered.

In addition, inner and outer pipes could be brazed by applying a lower melting point welding material to the inner pins on the inside and outside, and the bosses mounted on both sides of the outer pipe were also used for oxygen welding or high frequency welding. There was a problem that many people and time are required to manufacture the oil cooler because the acid treatment should be performed again due to the appearance oxidation.

7 is a view showing the oil cooler of the automatic transmission according to the prior art, Figure 8 is a side cross-sectional view showing A-A of Figure 7, Figure 9 is a side cross-sectional view showing the B-B of FIG.

Referring to the drawings; In the conventional oil cooler (1), the inner pipe (3) is inserted into the outer pipe (2), the space portion (4) is formed between them, both ends are sealed, the inner space portion (4) The pin 5 is inserted (loaded) and the tube 7 and the boss 6 are mounted in communication with the space 4 so that oil can be circulated at both ends of the outer pipe 2.

By the way, the conventional oil cooler (1) is formed of copper (Cu) or aluminum (Al) in neglecting the characteristics of each component in forming the oil cooler, the inner pipe (3) and the outer pipe (2) It was formed so that the inner pin 5 could be mounted.

The oil cooler manufactured by using copper (Cu) mainly used C2600 (0.6t) or C1220 (0.6t) for the outer pipe (2), the inner pipe (3) and the inner pin (5). The boss 6 and the tube 7 used copper of C3602. However, since the brass of C2600 is a mixture of copper (Cu) and zinc (Zn) at a ratio of 70: 30%, the thermal conductivity is low, thereby reducing cooling efficiency and easily corroding.

The inner pin 5 mounted on the space is not welded with the inner and outer pipes 3 and 2 so that the cooling efficiency is lowered. The outer pipes 2 and the boss 6 are torch welded. The both ends closed portion 8 may be formed by argon and oxygen welding to form an argon welding portion 8-1 and an oxygen welding portion 8-2, or may form a brazing welding and welding material coating welding portion.

The welding of the both ends of the closed part 8 has a problem in that it is cumbersome to perform acid treatment with carbonized foreign matters, and manual production must be performed by manual welding. Therefore, productivity and quality are deteriorated.

In the process of welding the exterior pipe 2 and the boss 6, the boss 6 must be welded in a state of placing the hole in the exterior pipe 2, so that the boss is not firmly supported during welding and the boss is separated. There was.

In addition, an oil cooler manufactured using aluminum (Al) was manufactured by using the outer pipe (2), the inner pipe (3) and the inner pin (5) mainly as aluminum (1.0t) of A3003. The tube 7 used aluminum of A6061. As described above, the oil cooler manufactured using aluminum has a problem of low thermal conductivity, low cooling efficiency of the oil, as well as low corrosion resistance and easy corrosion.

When the boss 6 is fixed, all brazing welding is performed while it is in the furnace, so that productivity can be improved, but after welding, it is not easy to identify the appearance. There was a problem done. In the process of using the aluminum material, there was a problem that the corrosion occurs in the boss area active contact with the outside air and cracks. There was also a problem that the boss is detached during movement in the brazing furnace because the boss is not firmly mounted during brazing welding while the boss is seated on the exterior pipe.

In addition, the oil cooler manufactured by using a combination of stainless steel (STS) and copper (CU), which are our inventions, was manufactured by using the outer pipe and the boss as stainless steel (STS), and the inner pipe and inner pin used copper (CU). It was. In order to weld the inner pin to the inner pipe and the outer pipe, the oil cooler manufactured as described above is manufactured due to the hassle of applying a welding material having a lower melting point (BNi: imported welding material) to the inner and outer sides of the inner pin. There was a problem that required a lot of people and time.

In addition, there is a problem in that the welding material falls off during the process of mounting the inner pipe and the outer pipe by hand after coating the welding material.

In addition, the welding material is not uniformly welded, so it is not welded partially, and the efficiency decreases. Also, since the internal and external pipes are made of dissimilar materials (STS & CU), corrosion resistance decreases due to dislocation corrosion due to dissimilar metal joining. There was a problem.

In order to solve the problems of the prior art made as described above, an object of the present invention is to form the inner pipe, the outer pipe, the inner pin, the boss and the like made of stainless steel and brazing welding with copper (CU) welding material This improves the productivity and makes it easy to identify the welding condition after welding, so that the inflow of defective products can be easily cut off, thereby providing the oil cooler for the automatic transmission, which can greatly improve the work process and the product quality and reliability. do.

The present invention for achieving the above technical problem,

An inner pipe is inserted into the outer pipe, a space is formed therebetween, and inner pins are inserted into the space, both ends are sealed, and both ends of the outer pipe are provided with a tube and In the oil cooler for an automatic transmission, the boss is provided in communication with the space,

Provides an oil cooler for an automatic transmission, wherein an inner pin, which is pre-plated with copper, is inserted between the inner pipe and the outer pipe so that the copper component is used as a welding material during brazing welding on the outer and inner circumferential surfaces of the inner pipe and the outer pipe. do.

In the following description of the present invention, detailed descriptions of well-known functions or configurations will be omitted if it is determined that the detailed description of the present invention may unnecessarily obscure the subject matter of the present invention.

In addition, terms to be described below are terms set in consideration of functions in the present invention, which may vary depending on the intention or custom of the producer, and the definitions should be made based on the contents throughout the present specification.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a view showing an oil cooler for an automatic transmission according to an embodiment of the present invention, Figure 2 is a side cross-sectional view showing a C-C of Figure 1, Figure 3 is a side cross-sectional view showing a D-D of FIG.

Referring to the drawings; The oil cooler 20 for an automatic transmission has an inner pipe 24 inserted into the outer pipe 22 so that a space 26 is formed therebetween, and an inner pin 28 is formed in the space 26. It is inserted (loaded), and both ends form a sealing part 27 to be sealed, and a tube (not shown) and a boss 30 are provided at both ends of the outer pipe 22 so that oil can flow. It is provided in communication with (26).

In the oil cooler 20 for an automatic transmission, cylindrical inner and outer pipes 22 and 24 were formed using stainless steel (STS) having a thickness of 0.3t, and between the inner and outer pipes 22 and 24. In the space portion 26 is formed.

An inner pin copper plating welding part 28-2 is formed in the space part 26 to which the inner pin 28 made of stainless steel (STS) having a thickness of 0.1t to 0.2t is copper plated and mounted on the front surface. The opposing surface 22 at both ends of the 22 and the outer pipe 24 is formed with a sealing portion 27 which is integrally coupled by the brazing welding portion 8-3.

Then, both ends of the outer pipe 24 are drilled to make the boss 30 communicate with the space 26, and then the copper washer 32 is mounted between the boss 30 and the outer pipe 24. It is fixed by pressing.

For reference, the copper plate material 31 and the copper washer 32 are described by giving names for convenience of description of the drawings, and are used as welding materials by melting during brazing welding.

In particular, the inner pipe 22, the outer pipe 24, the inner pin 28, the boss 30 are all formed of stainless (STS) material, and the inner pin 28 mounted inside the copper plating is mounted and welded Therefore, it is not necessary to perform the normal brazing welding (BRAZING FURNACE WELDING) in which a large amount of welded material is put in a furnace to perform welding at the same time.

Furthermore, since the present invention is copper plated and mounted on the inner pin 28 mounted between the inner pipe 24 and the outer pipe 22, the copper components plated during the brazing welding are melted with the welding material, so that the inner pipe 24 and the outer pipe are welded. (22) It is welded firmly to the circumferential surface.

The inner pin 28 may be provided by rolling a copper plate material which is melted during brazing welding in advance so that the inner pin 28 melts during brazing welding and is attached between the inner pipe 24 and the outer pipe 22.

On the other hand, the present invention may be variously modified and may take various forms in applying the above configuration.

And it is to be understood that the invention is not limited to the specific forms referred to in the above description, but rather includes all modifications, equivalents and substitutions within the spirit and scope of the invention as defined by the appended claims. It should be understood that.

The structure and operation of the oil cooler for an automatic transmission made as described above will be described in more detail as follows.

The outer pipe 22 and the inner tube pipe 24 formed in a cylindrical shape using stainless are molded, and the inner pin 28 is inserted into the space 26 between the inner pipe 24 and the outer pipe 22. The opposing surfaces of both the outer pipe 22 and the inner tube pipe 24 are integrally coupled to each other so as to be sealed.

In the combined state as described above, a hole is formed at both ends of the outer surface of the outer pipe 22 to fix the boss 30 in communication with the space 26, and the boss 30 is connected to the outer pipe 22. It is formed of the same material, that is, stainless, and welded to the external pipe 22 by the copper washer 32 therebetween.

In particular, in fixing the boss 30 to the outer pipe 22, ordinary brazing welding is performed in which a welding material is placed in a furnace to perform welding at the same time, thereby welding the acid treatment step without performing the welding.

Figure 4 is a view showing another embodiment of the oil cooler for an automatic transmission of Figure 1, Figure 5 is a side cross-sectional view showing the E-E of Figure 4, Figure 6 is a side cross-sectional view showing the F-F of FIG.

Referring to the drawings; A tube (not shown) coupled to the boss 30-1 on one side of the boss 30-1 is also formed of stainless steel having the same material as that of the boss 30-1. It is also integrally machined and mounted without joining the tubes. In addition, the inner pin (28-1) is rolled through the copper plate material 31 on the inner and outer sides, and then melted during brazing welding, the welding is airtight.

The boss 30-1 is formed by drawing molding a stainless plate, and is mounted by processing a screw portion (not shown).

The copper plate material 31 and the copper washer 32 are described by giving a name for convenience of description of the drawings, and are used as welding materials by melting during brazing welding.

As described above, according to the present invention, in manufacturing the oil cooler 20-1, the material of each component is manufactured in stainless steel (STS) to be molded to a thin thickness, thereby greatly improving thermal conductivity, corrosion resistance, and productivity. In addition, the thickness of the inner pipe (24-1) and the outer pipe (22-1) is formed into 0.3t thinner than brass (0.6t) and aluminum (0.6t) to actively heat exchange with the outside air, thereby cooling The efficiency is improved.

In addition, copper plated copper is used as the welding material by brazing welding the inner pin 28-1 mounted on the inner space 26-1, and thus the external pipes 24-1 and 22 are used. Inner pin (28-1) is hermetically welded to the circumferential surface of -1) and the inner pin (5) is not welded with the inner and outer pipes (3) and (2) like conventional brass. Is improved.

In addition, as the welding agent is applied to and mounted on the existing inner pin 5, the welding material is partially welded off, and thus the welding efficiency is improved.

Therefore, in the present invention, in particular, the inner pipe 24, the outer pipe 22, the inner pin 28, the boss 30 are all made of stainless material and by about 35% lower than the conventional copper oil cooler by reducing the thickness Product weight is reduced and productivity is improved by welding both ends, boss mounting and inner pin mounting at the same time through furnace brazing.

As described above, since the inner pipe, the outer pipe, the boss, and the inner pin are made of thin stainless steel, the product weight is reduced by about 35% compared to the brass, and the welding can be surely improved while improving corrosion resistance and corrosion resistance. The thermal conductivity is increased to improve the cooling efficiency.

In addition, by brazing welding the stainless steel oil cooler, it is possible to mass-produce the oxygen treatment step after oxygen welding, thereby improving productivity.

Since the boss is projected to the boss so that the boss does not escape from the external pipe during the brazing welding, the boss is squeezed at both ends of the external pipe so that the boss is firmly welded without being detached during the brazing welding.

The cost is reduced by drawing-molded and mounted in the form of an existing boss using a plate press.

 In addition, the cumbersome process of diluting the welding material (Bni: imported welding material) to the existing inner pin and then applying it with a brush is omitted, thereby improving productivity.

After brazing welding, it is easy to identify the welding condition, so that the defects can be searched out quickly, which improves the reliability of the product, and also allows the use of copper plating that can be manufactured domestically without importing welding materials. Product quality and reliability are improved.

Claims (4)

An inner pipe is inserted into the outer pipe to form a space between them, and both ends are sealed, and inner spaces are inserted (loaded) in the space, and oil is distributed at both ends of the outer pipe. In the oil cooler for an automatic transmission provided with a tube and a boss in communication with the space, An oil cooler for an automatic transmission, characterized in that the inner pipe and the outer circumferential surface of the inner pipe and the outer pipe when the brazing welding the copper component is attached to the inner pipe and the inner pipe with a copper plated inner pin beforehand. The method according to claim 1, The oil cooler for an automatic transmission, characterized in that the welding is pressed together with the copper washer that is melted during the brazing welding the communication hole of the outer pipe. The method according to claim 1, The inner pin is an oil cooler for an automatic transmission, characterized in that the copper plate material is rolled in advance so as to be melted during brazing welding on the inner and outer surfaces to be attached between the inner pipe and the outer pipe. The method according to claim 1, The boss is formed by drawing a stainless plate, the oil cooler for an automatic transmission, characterized in that the threaded portion is formed.

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