JPH068710U - 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 is supplied little by little to a lower portion of an oil cooler 13 by a pipe 15 branched from a cooling water passage in a cylinder head 14 of an engine 10, so that the oil cooler 1
When the high temperature oil in the oil flow path in 3 is cooled by the cooling water, the cooling water boils and evaporates, and the generated steam is sent from the upper part of the oil cooler 13 to the cooling water outlet 22 of the engine 10 by the pipe 21. It is sent to a radiator with cooling water.

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]

 As shown in FIG. 3, a conventional oil cooler 2 attached to a vehicle engine 1 and cooled by engine cooling water is attached to a bracket 4 fixed to a cylinder block 3, and a cylinder head 5 is attached. The cooling water is guided by a pipe 6 branched from a cooling water passage (not shown) inside, and the lubricating oil inside is cooled by the cooling water, while flowing out from the cooling water outlet 7 of the engine 1. The cooled cooling water is guided to a radiator (not shown) to be cooled, and returned from the cooling water inlet 8 to the cooling water passage in the engine 1 through the pump 9. However, the cooling water that has cooled the oil in the oil cooler 2 is pipe 10. Was returned to the cooling water inlet 8 and was sucked into the pump 9.

However, in this case, a large differential pressure is generated between the cylinder head 5 and the inlet of the pump 9 in order to positively flow the cooling water in the oil cooler 2 to obtain a large cooling water flow velocity. However, it is practically difficult to exert sufficient oil cooling capacity in the oil cooler 2, and the cooling water heated by the oil in the oil cooler 2 enters the cooling water inlet 8. Since the temperature of the cooling water sucked into the pump 9 is increased, the cooling water in the pump 9 causes boiling under reduced pressure, cavitation may occur, and the pump 9 may be eroded.

[0004]

[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.

[0005]

For this reason, the oil cooler according to the present invention is provided with an engine cooling liquid passage in the engine, which is branched from the engine cooling liquid passage, and through which the engine cooling liquid is led little by little. At least a part of the cooling liquid is immersed in the cooling liquid, and the oil flow path for boiling and evaporating the cooling liquid and the steam generated by the boiling of the engine cooling liquid flow into the engine cooling liquid passage from the engine to the radiator. It has a conduit.

[0006]

[Action]

 Therefore, the oil flowing in the oil flow passage immersed in the engine cooling liquid is sufficiently cooled by the engine cooling liquid by boiling and evaporating the engine cooling liquid, and the steam generated from the engine cooling liquid flows through the pipeline. Is guided to the engine coolant passage from the engine to the radiator and cooled by the radiator.

[0007]

【Example】

 Hereinafter, embodiments of the present invention will be specifically described. 1 and 2, an oil cooler 13 is attached to a bracket 12 fixed to a cylinder block 11 of a vehicle engine 10, and a pipe 15 branched from an engine cooling water passage (not shown) in a cylinder head 14 is connected to the oil cooler 13. The unsaturated cooling water communicating with the lower part of the engine and flowing into the oil cooler 13 by the pipe 15 has a small head difference between the engine cooling water passage and the oil cooler 13, or a small inner diameter of the pipe 15, Alternatively, a throttle (not shown) installed in the pipe 15 or a control mechanism that appropriately adjusts the flow area of the cooling water depending on the temperature of the cooling water is supplied little by little to the lower part of the oil cooler 13 and stored. The oil passage 16 in the oil cooler 13 is immersed in the cooling water.

On the other hand, the bracket 12 is provided with a guide path 17 and a return path 18 for oil that lubricates the engine 10, or high temperature oil that has flowed out from an auto transmission (not shown). The relatively high temperature oil fed to the flow passage 16 is cooled by the surrounding cooling water while flowing through the oil flow passage 16 as shown by the arrow, and the cooling water is boiled and evaporated. The oil is filtered by a filter paper 20 of an oil filter 19 which is fitted in the oil cooler 13 and is guided to an oil pan or the like (not shown) of the engine 10 through a return path 18.

The water vapor generated by heating the cooling water stored in the oil cooler 13 with the high temperature oil flows into the pipe 21 from the upper portion of the oil cooler 13 without staying in the oil cooler 13, and from the engine 10. The cooling water is led to a radiator (not shown) to the radiator and is sent to the radiator together with the cooling water flowing from the engine 10 to the cooling water outlet 22.

That is, since the oil flowing through the oil passage 16 in the oil cooler 13 is cooled by boiling and evaporating the cooling water, the cooling performance of the oil cooler 13 is significantly improved as compared with the conventional one. However, since the oil can be cooled sufficiently and easily, the oil cooler 13 can be downsized and manufactured at low cost, and the space for installing the oil cooler 13 can be small, so that it can be installed in a vehicle engine. The profit is especially large.

Further, since the steam generated by heating the oil in the oil cooler 13 is guided to the cooling water outlet 22 of the engine 10, the temperature of the cooling water sent from the cooling water outlet 22 to the radiator is in the oil cooler 13. Since the amount of heat radiated from the oil is increased as compared with the conventional case, the heat radiation performance of the radiator is also improved, and the engine 10 can be cooled more favorably.

Further, the cooling water is supplied little by little to the oil cooler 13 by the pipe 15, and since the cooling water does not evaporate by boiling until the cooling water reaches the boiling point, the cooling of the oil cooler 13 is performed while the cooling water is at a relatively low temperature. Since the performance is small, the oil cooler 13 does not strongly cool the oil when the engine 10 is started. Therefore, the oil temperature rises quickly and the friction loss of each part of the engine 10 is reduced, so that the fuel consumption of the engine 10 is easy. Can be improved.

[0013]

[Effect of device]

 In the oil cooler according to the present invention, the oil flowing in the oil passage is cooled by boiling and evaporating the surrounding engine coolant, so that the cooling performance is very good and the oil can be cooled effectively. At the same time, the heat recovered from the oil can be efficiently dissipated by the radiator, and the engine can be cooled well to improve the engine performance.

[Brief description of drawings]

FIG. 1 is a schematic layout diagram of an embodiment of the present invention.

FIG. 2 is an enlarged vertical cross-sectional view of a main part of the above embodiment.

FIG. 3 is a schematic layout diagram of a conventional device.

[Explanation of symbols]

 10 engine 12 bracket 13 oil cooler 15 pipe 16 oil flow path 17 oil guide path 18 oil return path 19 oil filter 21 pipe 22 cooling water outlet

 ─────────────────────────────────────────────────── ─── Continuation of front page (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 pipe branching from an engine cooling liquid passage in an engine to guide the engine cooling liquid, and at least a part of the pipe being immersed in the engine cooling liquid guided by the pipe to be cooled by the cooling liquid. An oil cooler having an oil passage for boiling and evaporating the cooling liquid, and a pipe for introducing steam generated by boiling of the engine cooling liquid to an engine cooling liquid passage from the engine to the radiator.