KR100559567B1 - Oil cooling system for automatic transmission - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic transmission oil cooling system, wherein an air-cooled oil cooler that is cooled by heat exchange with outside air is used as a main cooler, and a water-cooled oil cooler that is cooled by heat exchange with coolant in a radiator tank is used as an auxiliary cooler. The air-cooled oil cooler is changed to the front of the upper part of the radiator where the airflow is increased in front of the existing condenser to improve the cooling performance, and the hollow tube structure that reduces the oil resistance and heat transfer amount of the water-cooled oil cooler. It relates to an automatic transmission oil cooling system composed of.

According to the present invention, instead of reducing the heat transfer amount of the water-cooled oil cooler, the oil resistance is reduced, and at the same time, the cooling performance of the air-cooled oil cooler is improved, so that the engine cooling performance can be improved without degrading the performance of the entire system. Reduced heat transfer to the engine coolant eliminates the need for additional radiator and fan capacities, while increasing the oil flow rate and flow rate increases the cooling efficiency of the entire cooling system. In addition, since the air-cooled oil cooler does not overlap with the condenser, there is no heat transfer to the condenser, thereby improving performance of the condenser and the air conditioner.

Automatic Transmission, Oil Cooling System, Air Cooled Oil Cooler, Water Cooled Oil Cooler, Hollow Tube

Description

Oil cooling system for automatic transmission             

1 is a perspective view showing an installation state of an automatic transmission oil cooling system according to the present invention;

Figure 2 is a plan view schematically showing a connection state of the air-cooled oil cooler and water-cooled oil cooler in the present invention,

Figure 3 is a front view showing the air-cooled oil cooler and its mounting structure in the present invention,

Figure 4 is a view showing the structure of a water-cooled oil cooler in the present invention,

5 is a view for explaining the amount of air passing through the radiator by the electric fan,

6a and 6b is a view showing a conventional water-cooled oil cooler,

7 is a perspective view showing a conventional automatic transmission oil cooling system employing a water-cooled oil cooler and an air-cooled oil cooler together;

8 is a plan view schematically illustrating a connection state of a conventional water-cooled oil cooler and an air-cooled oil cooler.

 <Explanation of symbols for the main parts of the drawings>

1: condenser 2: intercooler

3: radiator 3a: radiator tank

5: automatic transmission 6: electric fan

10: air-cooled oil cooler 11a, 11b: header

12 tube 13 heat sink

14 mounting structure 14a fastening bracket

14b: mounting bracket 20: water-cooled oil cooler

25: hollow tube 26: fitting portion

27a: groove 27b: protrusion

30: oil hose

The present invention relates to an automatic transmission oil cooling system, and more particularly, to an air-cooled oil cooler in which air is cooled by heat exchange with outside air as a main cooler, and a water-cooled oil cooler in which a cooling is performed by heat exchange with cooling water in a radiator tank. It is configured as an auxiliary cooler, but changes the position of the air-cooled oil cooler in front of the upper part of the radiator where the ventilation volume is increased in front of the existing condenser to improve the cooling performance, and the structure of the water-cooled oil cooler to reduce the oil resistance and heat transfer amount The present invention relates to an automatic transmission oil cooling system composed of possible hollow tube structures.

In general, the oil of the automatic transmission is filled in the oil pan installed in the lower part of the transmission case, and is sucked by the oil pump and supplied to the torque converter and the valve body to act as a working fluid, and also supplied to various driving parts to serve as lubricating oil do.

The oil of the automatic transmission absorbs heat generated by slips between the engine and the automatic transmission, fluid friction in the flow paths supplied to the torque converter and the respective actuators, or mechanical friction of the actuators, thereby increasing the temperature. .

Therefore, the vehicle is equipped with a separate cooling system to prevent excessively rising the temperature of the oil for the automatic transmission, such as an oil cooler designed to release the heat of the oil outside and an oil hose connecting the oil cooler and the automatic transmission, etc. It is composed.

In general, the system employs a system in which the automatic transmission oil is circulated through the oil hose to the radiator to radiate heat by the temperature difference between the coolant and the oil. Thus, the oil cooler that radiates heat by the temperature difference between the coolant and the oil is called a water-cooled oil cooler. .

This water-cooled oil cooler is installed in the tank of the radiator long along its length direction, and is a double-pipe oil cooler that employs double pipes and inner pins largely according to its shape and structure, and laminated oil that uses a plurality of laminated tubes. It is divided into coolers.

This will be described in more detail with reference to the accompanying drawings.

6A shows a double tube oil cooler, and FIG. 6B shows a stacked oil cooler.

As shown, the double tube oil cooler 20a has an inner tube 22 inserted into the outer tube 21 and an inner pin 23 between the outer tube 21 and the inner tube 22. ) Is installed inside the radiator tank (3a), the coolant inside the outer tube 21 and the inner tube 22, the inner pin (23) between the outer tube 21 and the inner tube (22) Oil flows through this installed space.

In this structure, when the oil passes through the space where the inner pin 23 is installed, the heat of the oil is transferred to the cooling water through the inner pin 23 and the inner tube 22 / the outer tube 21 to cool the oil. It is meant to be built.

Since the oil flows in the space in which the inner pin 23 is installed, the double tube oil cooler 20a has a disadvantage in that the oil resistance is very large, the heat dissipation amount is small, and the pressure drop of the oil is very large.

On the other hand, the stacked oil cooler 20b has a structure in which a plurality of tubes 24 are stacked, so that oil flows through each tube 24, and the oil flows into the tube 24 from the inside of the radiator tank 3a. When this passes, heat of the oil is transferred to the cooling water outside the tube 24 so that the oil is cooled.

The laminated oil cooler 20b has a heat dissipation amount and a small oil resistance compared to the double tube oil cooler 20a, but has a disadvantage in that the manufacturing cost is high.

On the other hand, air-cooled oil coolers in addition to water-cooled oil coolers can be used to release more heat from oil in vehicles with heavy loads, such as taxis, large passenger cars, vehicles with trailers, and vehicles that have to run mainly on ramps. It may be added.

This air-cooled oil cooler is a cooler in which heat is radiated due to a temperature difference between outside air and oil.

The air-cooled oil cooler includes a plate type and a parallel flow type, and includes a plurality of tubes through which oil flows, and heat dissipation fins welded between the tubes. The oil is cooled by heat transfer between the oil flowing inside the tube and the outside air passing through the surface of the heat sink fins.

7 is a perspective view showing a conventional automatic transmission oil cooling system employing a water-cooled oil cooler and an air-cooled oil cooler together, and FIG. 8 is a plan view schematically illustrating a connection state of the water-cooled oil cooler and the air-cooled oil cooler.

As shown, the air-cooled oil cooler 10 includes a condenser 1 for cooling and condensing air conditioner refrigerant, an intercooler (installed only in a diesel vehicle) 2 for cooling the intake air, and cooling of the engine coolant. It is installed in the front space in the engine room together with the radiator (3) in charge of the air, similarly to the outside air forcibly sucked by the traveling wind flowing into the engine room from the front of the body and the electric fan (not shown in the rear of the radiator) Cooling is achieved by.

The air-cooled oil cooler 10 and the water-cooled oil cooler 20 are connected in series with respect to the automatic transmission 5 through an oil hose 30. FIG. 8 shows that the oil of the automatic transmission 5 is an air-cooled oil cooler ( 10) after passing through the water-cooled oil cooler 20 to the automatic transmission 5 is shown, the order of the air-cooled oil cooler and the water-cooled oil cooler may be reversed.

In addition, in a typical vehicle, the capacitor 1, the intercooler 2, the radiator 3, and the electric fan (not shown) are mounted in front of the vehicle body in front and rear directions, and the air-cooled oil cooler 10 is installed. Directly below the condenser 1, the outside air, which has passed through the air-cooled oil cooler 10, passes through the condenser 1, the intercooler 2, and the radiator 3 in this order.

However, the conventional automatic transmission oil cooling system made as described above has the following problems.

First, the trade-off between the engine cooling performance and the automatic transmission cooling performance shows that the larger the capacity of the water-cooled oil cooler and the smaller the oil resistance, the better the cooling performance of the automatic transmission oil, but the heat transfer from the radiator to the cooling water, which is a heat exchange medium. As a result, the cooling water temperature deteriorates.

Due to this tradeoff, it is necessary to increase the capacity of the radiator and the electric fan.

For example, if a laminated oil cooler with a large heat dissipation rate and a low oil resistance is applied, the oil temperature is improved by 10 to 15 ° C compared to a double tube oil cooler with a high oil resistance, thereby improving the automatic transmission cooling performance. Increasing the amount of heat transfer to the coolant side increases the engine cooling water temperature by 3 to 5 ° C., which deteriorates the engine cooling performance. Therefore, there is a problem that the capacity of the radiator and the electric fan must be further increased.

For reference, due to the heat transfer to the radiator coolant side, even though the automatic transmission vehicle has the same capacity as the manual transmission vehicle, the cooling water temperature is 5 ~ 10 ℃ high.

In addition, the oil resistance of the existing water-cooled oil cooler is very large, and when the air-cooled oil cooler is applied simultaneously to further improve cooling performance, the oil flow rate and flow rate are reduced due to excessive oil resistance, resulting in low overall cooling system efficiency. .

Therefore, a vehicle having a large amount of engine cooling performance and a margin of automatic transmission oil temperature applies a stacked oil cooler having a low oil resistance, thereby improving oil cooling performance by increasing oil flow rate and circulation amount. The engine cooling performance deteriorates due to the inverse relationship of.

In addition, when the existing water-cooled oil cooler, especially the double-pipe oil cooler 20a, is applied, the oil flows in the space where the inner pin 23 is installed, so the oil resistance and the pressure drop of the oil are very large, so that the required power of the automatic transmission There is a problem of worsening fuel economy due to the increase.

In addition, since the water-cooled oil cooler 20 is used as the main cooler and the air-cooled oil cooler 10 is used as the auxiliary cooler, the capacity of the water-cooled oil cooler is inevitably increased, thereby deteriorating engine cooling performance. Of course, there is a problem of increasing the size and weight of the radiator tank (3a) and the cost of the mounting space.

In addition, the conventional air-cooled oil cooler 10 is an optional item and smaller in size than other heat exchangers, that is, the condenser 1, the intercooler 2, the radiator 3, and the like. It is installed on the front side, and the cooling performance deteriorates due to the irrationality of the installation position.

That is, as shown in Fig. 6 and 7, the air-cooled oil cooler 10 is located in front of the condenser 1, the outside air (pass through the air-cooled oil cooler (oil temperature: 125 ~ 145 ℃) temperature rises (passing 70 ° C.) does not cool the air conditioner refrigerant (50 to 70 ° C.) inside the condenser 1 but rather heats the air conditioner cooling performance.

That is, although the temperature of the automatic transmission oil is much higher than the temperature of the air conditioner refrigerant, by placing the air-cooled oil cooler 10 in front of the condenser 1, the condenser region immediately behind the oil cooler is as much as the area occupied by the oil cooler. It becomes an invalid area which is not made | formed, and this becomes a factor which reduces the cooling performance of a capacitor eventually.

In particular, increasing the capacity of the air-cooled oil cooler further worsens the air-conditioning cooling performance (in the case of an automatic transmission vehicle compared to a manual transmission vehicle, the cooling performance is deteriorated by about 1 to 2 ° C), and therefore, there is a limitation in increasing the capacity of the air-cooled oil cooler, thus minimizing With the size and capacity of the air-cooled oil cooler has no choice but to mount.

Furthermore, in the related art, the air-cooled oil cooler 10 is installed downward in front of the condenser 1, and when the sub-cooled condenser is applied, the installation position of the air-cooled oil cooler (lower in front of the condenser) is the amount of heat dissipation in the condenser. It is located in front of this largest part.

That is, the capacitor 1 cools and condenses the refrigerant in the gas phase and discharges it as a liquid refrigerant. In the sub-cooling capacitor, the refrigerant passes first through the upper portion of the capacitor 1 and condensation is performed. After passing through the tank 31, the liquid refrigerant which has not been liquefied is separated from the liquid refrigerant in the receiver tank 31, and the liquid refrigerant is immediately discharged from the receiver tank 31. 1) It flows into the lower part, that is, the sub cool area, is cooled and then discharged as a liquid refrigerant.

Therefore, in the sub-cooled capacitor, the largest heat dissipation amount is the sub-cooled area under the capacitor with a relatively small area, and this sub-cooled area is the part which additionally cools the refrigerant that has not been liquefied and finally discharges it. Because of this, cooling degradation and heat shielding have a big impact on the overall performance of the capacitor.

Nevertheless, conventionally, since the air-cooled oil cooler is located directly in front of the sub cool area of the condenser, there is a problem that the overall performance of the condenser and the cooling performance of the air conditioner are greatly reduced.

Accordingly, the present invention has been invented to solve the above problems, instead of reducing the heat transfer resistance of the water-cooled oil cooler, by reducing the oil resistance, and at the same time improving the cooling performance of the air-cooled oil cooler, without degrading the performance of the entire system. It is possible to improve the automation cooling performance, reduce the heat transfer to the engine coolant, improve the engine cooling performance without increasing the radiator and fan capacity, and minimize the heat transfer from the air-cooled oil cooler to the condenser. It is an object of the present invention to provide an automatic transmission oil cooling system and an engine cooling system that can solve various problems.

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

The present invention provides an air-cooled oil cooler in which cooling is performed by heat exchange with an outside air, a water-cooled oil cooler in which cooling is performed by heat exchange with cooling water in a radiator tank, and an oil connecting the two oil coolers in series with an automatic transmission. In automotive transmission oil cooling system including a hose,

The air-cooled oil cooler is formed to be formed to the left and right to be horizontally disposed in front of the radiator in front of the radiator, but is installed in a parallel structure so as not to overlap with the intercooler and condenser in front of the radiator, wherein the water-cooled oil cooler has a single heat exchange part in the radiator The hollow pipe structure is characterized in that the structure is connected to the oil hose through the single hollow pipe fittings.

In particular, the air-cooled oil cooler is installed to the upper side of the radiator, characterized in that arranged in parallel with the intercooler or capacitor in front of the radiator.

In addition, the air-cooled oil cooler is characterized in that it has a mounting structure between the two radiator tanks for mounting the front of the radiator.

In addition, the mounting structure, characterized in that consisting of each mounting bracket is welded protruding side to side headers of the air-cooled oil cooler, and the mounting bracket is installed in each radiator tank and coupled to the fastening bracket in the corresponding direction. .

In addition, the surface of the single hollow tube of the water-cooled oil cooler is characterized in that the embossed structure formed with a plurality of concave groove (dimple) to increase the contact area with the cooling water.

In addition, the surface of the single hollow tube of the water-cooled oil cooler is characterized in that the embossed structure formed with a plurality of convex protrusions to increase the contact area with the cooling water.

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

The present invention relates to an automatic transmission oil cooling system, in order to solve various problems in the related art, the air-cooled cooler is made long in the horizontal direction and installed in the front position just in front of the radiator, and at the same time through the structure of the water-cooled cooler oil resistance and heat transfer amount The main focus is the change to a hollow tube that can be shrunk.

1 is a perspective view showing an installation state of an automatic transmission oil cooling system according to the present invention, Figure 2 is a plan view schematically showing a connection state of the air-cooled oil cooler and the water-cooled oil cooler in the present invention.

In addition, Figure 3 is a front view showing an air-cooled oil cooler and its mounting structure in the present invention, Figure 4 is a view showing the structure of a water-cooled oil cooler in the present invention.

As shown in the drawing, the automatic transmission oil cooling system according to the present invention, like the conventional configuration, is made of the air-cooled oil cooler 10 which is cooled by heat exchange with the outside air, and the engine coolant in the radiator tank 3a. It comprises a water-cooled oil cooler 20 is cooled by heat exchange, and an oil hose 30 connecting the oil coolers 10 and 20 to the automatic transmission 5.

In addition, the cooling system of the present invention improves the cooling performance of the air-cooled oil cooler 10 as compared to the prior art and uses it as the main cooler, and uses the water-cooled oil cooler 20 as an auxiliary cooler, air-cooled oil cooler (10) ) And the water-cooled oil cooler 20 are connected to the automatic transmission 5 through the oil hose 30.

2 shows an example in which the oil of the automatic transmission 5 passes through the air-cooled oil cooler 10 and then flows through the water-cooled oil cooler 20 to the automatic transmission 5 again. The air-cooled oil cooler and the water-cooled oil cooler The order of may be reversed.

In the cooling system of the present invention, the air-cooled oil cooler 10 is formed to have a long left and right structure and is horizontally disposed in front of the radiator 3.

Here, the air-cooled oil cooler 10 is installed above or below the radiator 3 and arranged in parallel so as not to overlap with the intercooler 2 or the condenser 1 in front of the radiator 3.

More preferably, the air-cooled oil cooler 10 is installed to the upper side of the radiator 3, characterized in that arranged in parallel with the intercooler 2 or the condenser 1 in front of the radiator (3).

Looking at the detailed structure, the plurality of tubes (12) in which the oil flows between the left and right headers (11a, 11b) are arranged in parallel and long connected in the horizontal direction, the heat radiation fins in the space between each tube (12) (13) has a structure provided by welding.

In this structure, the oil flowing into the one header 11a through the oil hose 30 flows in parallel along the tube 12 and is cooled by outside air passing through the surface of the heat dissipation fin 13, and then the opposite header 11b. After collected in the discharge through the oil hose (30).

Thus, the overall structure is the same as a conventional parallel flow type oil cooler, but the tube 12 through which the oil flows is formed longer from side to side, so that the oil path during cooling is longer.

In addition, the air-cooled oil cooler 10 of the present invention has a mounting structure (14) between the radiator tank (3a) for the front mounting of the radiator (3), which is welded side protruding to both header (11a, 11b) Each fastening bracket 14a and a radiator tank 3a are provided with an assembly unit, and the fastening bracket 14a is bolted to each of the mounting brackets 14b.

That is, the air-cooled oil cooler 10 is fixed to a position in front of the radiator 3 by mounting the two headers 11a and 11b to the respective radiator tanks 3a in the corresponding direction by the mounting structure 14. Will be.

The air-cooled oil cooler 10 of the present invention is installed in front of the radiator 3 in front of the radiator 3 long in the horizontal direction, most preferably installed in front of the radiator upper portion of the air passing amount by the electric fan, that is, the air volume of the fan most. .

As shown in FIG. 5, when the electric fan 6 mounted behind the radiator 3 is driven, the amount of air forced to be sucked by the electric fan 6 from the front and passed through the radiator 3 is radiator 3. ) It gradually increases from the lower side to the upper side.

In addition, in the upper end portion of the radiator 3, the air passage amount is large, but in the cross flow type radiator, the cooling efficiency is the lowest portion.

Therefore, when the air-cooled oil cooler 10 of the present invention is installed in the upper portion of the radiator 3 having the largest fan air flow rate, the cooling performance of the air-cooled oil cooler can be further increased by increasing the passage air volume without deteriorating the performance of the radiator. In addition, it is possible to solve the noise problem of the electric fan (6) generated by passing a lot of air in the upper portion of the relatively low ventilation resistance than the lower portion of the radiator having a large ventilation resistance.

Referring to FIG. 1, it can be seen that the air-cooled oil cooler 10 of the present invention is mounted directly to both radiator tanks 3a by the mounting structure 14 and mounted directly in front of the upper part of the radiator 3.

1 illustrates an example of a diesel vehicle in which the intercooler 2 is mounted. In the case of the diesel vehicle, the air-cooled oil cooler 10 is disposed in parallel above the intercooler 2 and installed in front of the radiator 3.

At this time, the condenser 1 reduces the vertical height slightly through high efficiency, so that the air-cooled oil cooler 10 is positioned at a position higher than the condenser 1, and the front of the air-cooled oil cooler 10 is connected to the condenser 1. In order not to be covered by the air, the outside air forcedly sucked by the driving wind or the electric fan passes through the radiator 3 immediately after passing through the air-cooled oil cooler 10 without passing through the condenser 1.

If the vehicle does not have the intercooler 2, the air-cooled oil cooler 10 is disposed in parallel above the condenser 1 and installed in front of the radiator 3.

As described above, only the radiator 1 is located behind the air-cooled oil cooler 10, and when the air-cooled auto oil cooler 10 and the condenser are mounted in parallel, the amount of air passing through the oil cooler is in the same way as the conventional condenser front mounting method. Compared with, the heat dissipation amount and the cooling performance of the air-cooled oil cooler 10 can be increased by increasing the flow rate of the oil cooler.

In the related art, the air-cooled oil cooler is installed in front of the sub-cooling area to greatly reduce the overall performance of the condenser, and the installation position of the air-cooled oil cooler in the cooling system of the present invention is changed to a position that does not overlap with the condenser. At this time, even if the upper and lower heights of the capacitor 1 are reduced as described above, the overall performance of the capacitor can be reduced or rather improved.

On the other hand, when describing the water-cooled oil cooler according to the present invention.

As shown in FIG. 4, the water-cooled oil cooler 20 of the present invention is inserted into the radiator tank 3a in the longitudinal direction in the radiator tank 3a as in the prior art, and particularly, a portion where heat exchange is performed inside the radiator tank 3a. It is configured in the form of a single hollow tube.

That is, the oil hose 30 is connected to both ends of the single hollow tube 25 through the fitting portion 26, and the inner pin is not installed therein.

As a preferred embodiment, the surface of the hollow tube 25 forms a plurality of concave grooves (dimple; 27a) or a plurality of convex protrusions (27b) to form an embossed structure, thereby increasing the contact area with the cooling water And facilitate turbulent flow of the boundary layer around the surface.

In this structure, the oil introduced into the hollow tube 25 through the oil hose 30 on one side flows along the hollow tube 25 to transfer heat to the coolant outside the hollow tube, thereby cooling.

As such, the water-cooled oil cooler 20 of the present invention having a single hollow tube structure has a simple circular pipe structure without inner pins installed, and thus has low oil resistance and reduces heat transfer to the cooling water.

As a result, by applying a hollow tube type oil cooler whose heat transfer amount to the cooling water is reduced compared to the conventional lamination type, the heat transfer amount to the cooling water is reduced, so that the performance of the engine cooling system can be improved, and the engine cooling performance and the automatic transmission cooling are reduced. The trade-off between performance can be improved.

In this way, the cooling system according to the present invention is based on the combination of the air-cooled oil cooler 10 and the water-cooled oil cooler 20 made as described above, the operation and effect will be described as follows.

First, as described above, the water-cooled oil cooler 20 of the present invention can improve the engine cooling performance because the amount of heat transfer to the cooling water is small, and improve the trade-off between the engine cooling performance and the automatic transmission cooling performance. To be able.

In addition, in the cooling system of the present invention, since the efficiency of the air-cooled oil cooler 10 is increased and the capacity of the water-cooled oil cooler 20 is reduced to improve the automatic transmission cooling performance, the amount of heat transfer to the engine cooling water temperature is small. There is no need for increased radiator and fan capacity.

In addition, in the water-cooled oil cooler 20 of the present invention, the hollow tube structure is applied, so that the outer diameter is smaller than that of the conventional double tube oil cooler, but the cross-sectional area of the oil passage is increased, and the oil flow rate is small because there is no inner pin, so the oil flow resistance is small. The overflow will be increased.

By increasing the oil flow rate and flow rate of the water-cooled oil cooler 20, it is possible to increase the flow rate and flow rate of the entire automatic transmission cooling system, and as a result, the efficiency of the entire cooling system is increased without deteriorating engine cooling performance.

In the state where the flow rate and flow rate of the oil are increased as described above, the air-cooled oil cooler 10 is installed in front of the upper part of the radiator 3 in order to increase the amount of forced heat exchange by the electric fan 6. It is possible to increase the passing air volume of (10), thereby increasing the heat radiation amount of the air-cooled oil cooler to further improve the automatic transmission cooling performance.

In addition, since the oil pressure drop is reduced by the adoption of the hollow tube type oil cooler 20, the fuel efficiency is improved by reducing the required power of the automatic transmission 5.

In addition, since the hollow tube type oil cooler 20 of the present invention is smaller in size than the conventional double tube type or laminated type oil cooler, it is possible to reduce the size of the radiator tank 3a, which is a mounting space, when applied to the radiator tank. And it is possible to reduce the weight and cost by reducing the size of the header.

In particular, since the hollow tube type oil cooler 20 is simpler in structure than the conventional water-cooled oil cooler, the manufacturing cost is low, and thus, the oil cooler itself can reduce the cost.

In addition, the thickness of the radiator 3 can be reduced by reducing the heat transfer amount to the cooling water, thereby reducing the cost of slimming the radiator.

In addition, by preventing the air-cooled oil cooler 10 from overlapping with the capacitor 1 in the air passing direction, there is no heat transfer to the capacitor, and consequently, the performance of the capacitor can be improved as compared with the conventional capacitor front mounting method. Bar air conditioner performance of the vehicle can be improved.

Thus, in the cooling system of the present invention, the air-cooled oil cooler 10 is used as the main cooler, the water-cooled oil cooler is used as the auxiliary cooler 20, and the insufficient cooling performance of the water-cooled oil cooler 20 is air-cooled oil cooler 10. Compensated by improving the cooling performance.

In the present invention, the air-cooled oil cooler 10 has a large amount of heat dissipation in comparison with the size, and has a small thickness, which is advantageous in terms of mounting performance.

As described above, according to the automatic transmission oil cooling system according to the present invention, the air-cooled oil cooler that is cooled by heat exchange with the outside air is used as the main cooler, and the water-cooled type that is cooled by heat exchange with the cooling water in the radiator tank. The oil cooler is configured as an auxiliary cooler, but the position of the air-cooled oil cooler is changed from the front of the existing condenser to the front of the upper part of the radiator, where the airflow is increased, to improve the cooling performance, and the structure of the water-cooled oil cooler provides oil resistance and electrical resistance. By constructing a hollow tube structure capable of reducing calories, the following effects are obtained.

1) Instead of reducing the heat transfer capacity of the water-cooled oil cooler, the oil resistance is reduced, and at the same time, the cooling performance of the air-cooled oil cooler is improved, so that the automatic transmission cooling performance can be improved without degrading the performance of the entire system. It is possible to improve the trade-off between the cooling performance and the automatic transmission.

2) Reduced heat transfer to the engine coolant eliminates the need for additional radiator and fan capacities, and reduces radiator and fan capacities compared to the prior art, resulting in cost savings and noise reduction.

3) The oil flow rate and flow rate are increased by decreasing the oil resistance of the water-cooled oil cooler, and the cooling efficiency of the whole system is increased by increasing the oil flow rate and the flow rate of the whole cooling system.

4) Since the oil pressure drop is reduced by adopting the hollow tube oil cooler, the fuel efficiency is improved.

5) The hollow tube type oil cooler is small in size and simple in structure, which makes it possible to reduce the size of the radiator tank, which is the mounting space, and to reduce the weight and cost by reducing the size of the radiator tank and the header. Cost reduction is also possible.

6) Since the air-cooled oil cooler does not overlap with the capacitor, there is no heat transfer to the capacitor, and consequently, the performance of the condenser and the air conditioner can be improved.                     

Claims (6)

An automobile including an air-cooled oil cooler that is cooled by heat exchange with outside air, a water-cooled oil cooler that is cooled by heat exchange with cooling water in a radiator tank, and an oil hose that connects the two oil coolers in series with an automatic transmission. In transmission oil cooling system, The air-cooled oil cooler is formed to be formed to the left and right to be horizontally disposed in front of the radiator in front of the radiator, but is installed in a parallel structure that does not overlap with the intercooler and condenser in front of the radiator, wherein the water-cooled oil cooler is a single hollow heat exchange part in the radiator An automatic transmission oil cooling system, characterized in that the tubular structure has a structure in which an oil hose is connected to both ends of the single hollow tube through a fitting part. The method according to claim 1, The air-cooled oil cooler is installed above or below the radiator, the automatic transmission oil cooling system, characterized in that disposed in parallel with the intercooler or condenser in front of the radiator. The method according to claim 1, And the air-cooled oil cooler has a mounting structure between both radiator tanks for front mounting of the radiator. The method according to claim 3, The mounting structure, Automatic transmission oil cooling system, characterized in that consisting of a mounting bracket that is welded protruding side to side headers of both sides of the air-cooled oil cooler, and a mounting bracket is installed in each radiator tank and coupled to the fastening bracket in the corresponding direction. The method according to claim 1, A single hollow tube surface of the water-cooled oil cooler is an automatic transmission oil cooling system, characterized in that the embossed structure formed with a plurality of concave grooves (dimple) for increasing the contact area with the cooling water and the heat dissipation performance through turbulent flow formation of the boundary layer . The method according to claim 1, And a single hollow tube surface of the water-cooled oil cooler has an embossed structure in which a plurality of convex protrusions are formed to increase the contact area with the cooling water.

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