JPH068712U - Oil cooler - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the cooling performance of an oil cooler cooled by engine cooling water. [Structure] A cooling water pool 8 is formed by a partition wall 7 at a lower rear portion of a high temperature side tank 2 of a radiator to which engine cooling water is fed from an engine, and a heat exchange pipe 10 is installed in the cooling water pool 8 for heat generation. The high temperature oil flowing through the exchange pipe 10 is cooled by boiling and evaporating the cooling water staying in the cooling water pool 8.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an oil cooler attached to a vehicle engine or the like.

[0002]

[Prior art]

 The conventional oil cooler that cools the vehicle's engine lubrication oil and auto transmission oil, when the air-cooled type is installed in front of the radiator, reduces the wind speed of the radiator, increases the wind speed unevenness, and increases the temperature of the air flowing into the radiator. As a result, there are drawbacks such as rising, long oil piping to the front of the radiator, and in the case of the water cooling type installed in the radiator lower tank or near the oil filter, the amount of cooling water received by cooling the oil increases, However, in the case of an oil cooler that is cooled by forced convection heat transfer, any of the above problems will occur. Was unavoidable.

[0003]

[Problems to be solved by the device]

 The present invention aims to improve the cooling performance of an oil cooler cooled by an engine coolant.

[0004]

[Problems to be solved by the device]

 For this reason, the oil cooler according to the present invention is partitioned in the high temperature side tank of the radiator to which the engine coolant is supplied from the engine or adjacent to the high temperature side tank, and at least the upper part communicates with the high temperature side tank. The engine cooling liquid pool in which the engine cooling liquid stays and the heat exchange element installed in the engine cooling liquid pool to guide the oil are provided. Inside the engine cooling liquid pool described above by the oil flowing in the heat exchange element. It is configured so that the engine coolant that accumulates in the engine will boil and evaporate.

[0005]

[Effect] That is, since the engine cooling liquid from the radiator high temperature side tank is accumulated in the engine cooling liquid pool, the high temperature oil flowing in the heat exchange element cools the engine cooling liquid in the engine cooling liquid pool. The liquid can easily boil and evaporate to cool the oil well, and the steam generated in the engine cooling liquid pool flows into the high temperature side tank from the upper part of the engine cooling liquid pool, The engine coolant is replenished from the high temperature side tank.

[0006]

【Example】

 Hereinafter, embodiments of the present invention shown in the drawings will be specifically described. 1 and 2, a radiator 1 attached to the front of the vehicle has a steam-water mixture formed by boiling engine cooling water from an on-board engine (not shown) or an unsaturated portion above the tank 2 on the high temperature side. High temperature cooling water is sent through the passage 3 and cooled by the finned tubes 4 of the radiator 1 which are arranged substantially horizontally, and the cooling water is sent back from the lower part of the low temperature side tank 5 to the engine through the return passage 6. Be done.

A cooling water pool 8 partitioned by a partition wall 7 is provided integrally with the high temperature side tank 2 at a lower rear portion of the high temperature side tank 2, and the upper end of the cooling water pool 8 is connected to the inside of the high temperature side tank 2. While the passage 9 is provided, the heat exchange pipes 10 and 11 are installed in the cooling water pool 8, the high temperature oil that lubricates the engine is introduced to the heat exchange pipe 10, and the heat exchange pipe 11 has an automatic transmission. The high temperature oil flowing out of the cooling water is guided through the heat exchange pipes 10 and 11 and is cooled by the cooling water in the cooling water reservoir 8.

At this time, since the cooling water stays in the cooling water pool 8, the cooling water in contact with the heat exchange pipes 10 and 11 is easily heated by the heat received from the high temperature oil to be boiled and evaporated to be cooled. The water vapor generated in the water pool 8 rises and passes through the communication passage 9 and is discharged into the high temperature side tank 2. At the same time, the cooling water flows into the cooling water pool 8 from the high temperature side tank 2 through the communication passage 9. Will be replenished. That is, since the oil in the heat exchange pipes 10 and 11 is cooled by the boiling heat transfer of the cooling water, the heat transfer coefficient is very large and the cooling performance of the oil by the cooling water is excellent. The oil can be cooled effectively even when the temperature difference with the cooling water is small.

Further, since the steam generated by heating the oil in the cooling water pool 8 flows to the high temperature side tank 2 and the heat radiation amount of the oil is supplied to the high temperature side tank 2, the heat radiation performance of the finned tube 4 is increased. However, the engine can be cooled even better.

Further, since the oil guided to the heat exchange pipes 10 and 11 is cooled by boiling and evaporating the cooling water in the cooling water reservoir 8, there is an advantage that the temperature is stabilized, and at the time of starting the engine. When the temperature of the oil is relatively low, as described above, the oil in the heat exchange pipes 10 and 11 can be heated relatively quickly by the cooling water in the cooling water reservoir 8, so that the lubricity of the engine is improved. As a result, friction loss of each part is reduced and the fuel efficiency of the engine can be easily improved.

A small hole for communicating the inside of the high temperature side tank 2 with the cooling water reservoir 8 is appropriately provided at an appropriate middle portion or a lower portion of the partition wall 7 to cool the cooling water reservoir by cooling the oil in the heat exchange pipes 10 and 11. When the water vapor generated in 8 is discharged into the high temperature side tank 2 through the communication passage 9, the cooling water flows from the high temperature side tank 2 into the cooling water pool 8 through the small holes, and the cooling water is discharged. By facilitating replenishment, the above-mentioned release of water vapor can be further smoothed. Needless to say, the pool of cooling water may be provided beside the high temperature side tank or inside the high temperature side tank.

Next, another embodiment shown in FIG. 3 will be described. In this case, the engine cooling water is supplied from the engine to the high temperature side tank 21 of the downflow type radiator 20, and the cooling water cooled by the finned tube 22 of the radiator 20 is supplied from the lower temperature side tank (not shown) to the engine. Although returned, the cooling water reservoir 24 is partitioned by the partition wall 23 in the high temperature side tank 21, and several small holes 25 are provided on the upper surface of the partition wall 23. Further, a meandering heat exchange pipe 30 is installed in the cooling water pool 24, and the high temperature oil that lubricates the engine or the high temperature oil flowing out from the auto transmission circulates in the heat exchange pipe 30 to cool the inside of the cooling water pool 24. It is cooled by water.

Since the cooling water is retained in the cooling water pool 24 by the partition wall 23, the cooling water in contact with the heat exchange pipe 30 is easily heated by the heat received from the high-temperature oil and boiled to evaporate. The water vapor generated in 1 rises and passes through the small holes 25, mixes into the cooling water in the high temperature side tank 21 and abruptly condenses, while it cools into the cooling water pool 24 from the high temperature side tank 21 through the small holes 25. Since water is replenished, it is possible to obtain the same effect as that of the above embodiment. It should be noted that by appropriately forming fine pores on the side surface or the lower surface of the partition wall 23, the cooling water is replenished from the fine pores into the cooling water reservoir 24 as the water vapor flows out from the cooling water reservoir 24, and the water vapor flows out. You can make it easier.

[0014]

[Effect of device]

 In the oil cooler according to the present invention, the high temperature oil introduced into the heat exchange element is cooled by the engine cooling liquid staying in the engine cooling liquid pool, and the engine cooling liquid can be easily boiled and evaporated. Therefore, the cooling power of the oil by the engine cooling liquid is extremely large, so that the oil can be effectively cooled and the oil temperature can be stabilized.

[Brief description of drawings]

1 is a vertical cross-sectional view of a main part of an embodiment of the present invention, which is an enlarged cross-sectional view taken along the line II of FIG.

FIG. 2 is an overall perspective view of the above embodiment.

FIG. 3 is a schematic vertical cross-sectional view of a main part in another embodiment of the present invention.

[Explanation of symbols]

 1 Radiator 2 High Temperature Side Tank 7 Partition Wall 8 Cooling Water Reservoir 9 Communication Passage 10 Heat Exchange Pipe 11 Heat Exchange Pipe 20 Radiator 21 High Temperature Side Tank 23 Partition Wall 24 Cooling Water Pool 25 Small Hole 30 Heat Exchange Element

Front Page Continuation (72) Inventor Tetsuji Ukita 5-3-8 Shiba, Minato-ku, Tokyo Inside Mitsubishi Motors Corporation

Claims (1)

[Scope of utility model registration request] 1. A radiator in which engine cooling liquid is fed from an engine is partitioned in a high temperature side tank or adjacent to the high temperature side tank, and at least an upper portion communicates with the high temperature side tank and the engine cooling liquid stays there. An engine cooling liquid pool and a heat exchange element installed in the engine cooling liquid pool for guiding oil are provided, and the engine cooling liquid staying in the engine cooling liquid pool is boiled by the oil flowing in the heat exchange element. Oil cooler configured to evaporate.