JP2589794Y2 - Internal combustion engine cooling system - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling device for an internal combustion engine.

[0002]

2. Description of the Related Art Conventionally, various cooling devices have been provided in vehicles in order to lower the temperature of an engine, oil, intake air and the like.

[0003] For example, in a water-cooled engine, the engine is cooled by circulating cooling water with a water pump in a water jacket provided around the outside of a cylinder. The cooling water heated by the cooling is supplied to a radiator. The heat is exchanged by the air from the vehicle and the cooling fan. The engine automatically controls the amount of cooling water flowing to the radiator by opening and closing the thermostat valve because the engine may malfunction if it gets too cold.

In recent years, a radiator with a built-in oil cooler that incorporates an oil cooler for cooling engine oil, torque converter oil, and the like in a lower tank of the radiator and cools the oil with cooling water flowing in the radiator has been widely used. Furthermore, in many vehicles equipped with a turbocharger, various means are used to lower the temperature of the engine, oil, intake air, and the like, such as lowering the intake air temperature by installing an intercooler.

[0005]

By the way, the oil cooler built in the lower tank cannot perform necessary heat exchange unless a considerable amount of cooling water is circulated through the radiator, and cannot sufficiently fulfill the oil cooling function.

Therefore, while the temperature of the cooling water in the engine is low and the thermostat valve is closed, the cooling water circulates in the engine and does not flow into the radiator, so that the function as the oil cooler is sufficient. Therefore, there is a possibility that the oil may be deteriorated early.

[0007] Conventionally, many intercoolers have an independent path separate from the engine as shown in FIG.
The cooling water W is forcibly circulated between the dedicated sub radiator 1 and the intercooler 3 by the water pump 5, and the intake air A sent from the turbocharger to the combustion chamber is actively cooled by the cooling water W. In the figure, reference numeral 7 denotes a turbocharger compressor.

However, by providing an independent path separate from the engine as described above, a dedicated sub-radiator 1 and the like must be provided, and the structure is complicated, and there are problems in terms of space and cost. Was.

The present invention has been made in view of such circumstances, and by improving the conventional cooling device as described above,
An object of the present invention is to provide a cooling device for an internal combustion engine that prevents early deterioration of oil while maintaining a cooling function of an engine, and also suppresses a cost increase due to mounting an intercooler.

[0010]

To achieve such object, according to an aspect of, devised according to claim 1, between the oil cooler internal radiator and the internal combustion engine with a built-in oil cooler to Roatan click, cooled equipped with thermostat In a cooling device for an internal combustion engine provided with a water circulation system,
Equipped with an outlet directly on the lower tank of the radiator
Sub-cooling water circulation with return port on upper tank side of radiator
An annulus is formed, and a thermostat is
The cooling water in the sub-cooling water circulation system
Attach a water pump to control
When an intercooler is installed downstream of the heat pump,
The water pump is installed on the front side of the internal combustion engine.
With, those were Attach the intercooler to the top of the internal combustion engine.

The invention according to claim 2 is based on claim 1.
In the cooling device for an internal combustion engine described above,
The return port and the outlet are arranged near the diagonal line of the radiator.

[0012]

According to the first aspect of the present invention, regardless of whether the cooling water is introduced into the radiator from the internal combustion engine by opening and closing the thermostat, the cooling water in the lower tank is supplied to the water pump on the side of the auxiliary cooling water circulation system. As a result, the coolant is forcibly circulated between the sub-cooling water circulation system and the radiator, so that heat exchange with the high-temperature intake air is performed by the intercooler, and heat exchange with the oil cooler is performed by the lower tank. And vice
Returned to the radiator via the return port of the cooling water circuit
The cooling water is heat-exchanged by the radiator core,
And heat exchange of the oil cooler is performed.
The auxiliary cooling water circulation system is directly connected to the lower tank of the radiator.
Equipped with an outlet to take out cooling water directly from the lower tank
Water flow required for the intercooler
It will be secured by the pump.

[0013] Further, according to the invention according to claim 2, the cooling water returned from the sub cooling water circulation pathway of the return port to the radiator, after being heat-exchanged in the radiator core, oil cooler flows into the lower tank It flows over the entire circumference and heat exchange with the oil cooler is performed well.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic view of a cooling device according to an embodiment of the present invention, and FIG. 2 is a side view of an engine equipped with the cooling device.
Radiator with built-in oil coolers 13 and 15 on one side of lower tank 11
The outlet pipes 21 and 23 are inserted through the outlet pipes 7 and 19.

As in the prior art, a cooling water circulation system provided with a thermostat or a water pump is provided between the radiator 9 and the engine 25. That is,
A cooling water inlet pipe 29 and an outlet pipe 31 are inserted into the upper tank 27 and the lower tank 11 of the radiator 9, and each pipe 29, 31 is connected to the engine 25 via a cooling water passage pipe such as a radiator hose. ing. The cooling of the engine 25 is achieved by forcibly circulating the cooling water in the water jacket with a water pump mounted on the engine 25 side. When the cooling water reaches a certain temperature, the thermostat valve is opened and the high temperature Cooling water is introduced from the inlet pipe 29 to the upper tank 27 of the radiator 9 via a cooling water passage pipe.

The high-temperature cooling water introduced into the upper tank 27 is cooled by the traveling wind and the wind of the cooling fan 34 when flowing down the radiator core 33, and
To the engine via an outlet pipe 31 and a cooling water passage pipe. Also, the engine 25
As long as the temperature of the cooling water inside is low and the thermostat valve is closed, the cooling water bypasses the radiator 9 and circulates in the engine 25 in the same manner as in the related art.

In this embodiment, in addition to the conventional structure as described above, as shown in FIG. 1, a sub-cooling water circulation system 39 equipped with a water pump 35 and an intercooler 37 is provided.
Is provided on the radiator 9 independently of the cooling water circulation system. As shown in FIG. 2, the water pump 35 is mounted on the front side of the engine 25, and the intercooler 37 is mounted on the upper part of the engine 25. Installed.

That is, in FIG. 1 , reference numeral 41 denotes an inlet pipe (return port) of the sub-cooling water circulation path 39 inserted in the upper tank 27 separately from the inlet pipe 29, and reference numeral 43 denotes a sub-cooling inserted in the lower tank 11. in the outlet pipe of the water circulation path 39 (outlet), both pipes 41 and 43 as shown that are disposed in the vicinity of the diagonal line L of the radiator 9. Between the outlet pipe 43 and inlet pipe 41, through the cooling water passage tube 45 and the U <br/> Otaponpu 35 and the intercooler 37 are sequentially arranged, from the engine 25 by the opening and closing of the thermostat valve Regardless of whether the cooling water is introduced into the radiator 9 or not, the cooling water in the lower tank 11 pumped by the water pump 35 is sent to the intercooler 37, and the intercooler 37 supplies high-temperature intake air from the turbocharger. After being used for heat exchange with the radiator 9, the heat is returned to the radiator 9 again through the cooling water passage pipe 45 and the inlet pipe 41.

The cooling water returned to the radiator 9 is
After being cooled by the radiator core 33, it flows into the lower tank 11 to exchange heat with the oil coolers 13 and 15, and is again turned on by the water pump 35.
The cooling water is sent to the radiator 9 and the auxiliary cooling water circulation system 3 by a water pump 35.
Forcibly circulate through 9 spaces. FIG.
Inside, 47 is a fan shroud.

Since the cooling device for an internal combustion engine according to the present embodiment is configured as described above, the water pump mounted on the cooling water circulation system forcibly circulates the cooling water in the water jacket as in the conventional case. The engine 25 is cooled. Then, when the cooling water reaches a certain temperature, the thermostat valve opens, so that the high-temperature cooling water is introduced into the radiator 9 from the inlet pipe 29 through the cooling water passage pipe, and after the radiator 9 exchanges heat,
The refrigerant is returned to the engine 25 through the outlet pipe 31 and the cooling water passage pipe.

On the other hand, regardless of whether the cooling water is introduced from the engine 25 into the radiator 9 by opening and closing the valve of the thermostat, the cooling water in the lower tank 11 is supplied to the sub-cooling water circulation system 39 by the water pump 35 and the radiator. 9, the heat exchange with the high-temperature intake air is performed in the intercooler 37, and the heat exchange with the oil coolers 13 and 15 is performed in the lower tank 11. So
Thus, the sub-cooling water circulation path 39 is connected to the cooling water circulation
It is not a structure bypassed from the ring road, but a radiator 9
The outlet pipe 43 into the lower tank 11
The cooling water was taken directly from the lower tank 11.
And the flow rate required for the intercooler 37 is
35.

In this embodiment, the inlet pipe 41
And the outlet pipe 43 are arranged in the vicinity of the diagonal line L of the radiator 9, so that cooling water flows over the entire circumference of the oil coolers 13 and 15, and the oil is cooled well.

As described above, in the present embodiment, the cooling water is supplied to the radiator 9 by the water pump 35 regardless of whether the cooling water is introduced from the engine 25 into the radiator 9 by opening and closing the valve of the thermostat. Since the forced circulation was always performed between the water circulation paths 39, the lower tank 1
The active heat exchange between the oil in the oil coolers 13 and 15 and the cooling water built in 1 is made possible, and the deterioration of the oil can be prevented.

According to the present embodiment, the function of the intercooler 37 can be maintained, of course, while the original function of the radiator 9 for cooling the engine 25 is not impaired at all. Since the radiator 9 used for cooling the engine 25 is also used as a radiator for cooling the intercooler 37, there is no need to provide a dedicated sub-radiator as in the conventional case, and the conventional problems in space and cost can be solved. Was. Also, already
As described above, this embodiment is arranged on the front side of the engine 25.
Attach the water pump 35, and
Since the intercooler 37 is attached,
Even if an additional 39 is arranged, the
We play effective use of pace. Furthermore, this embodiment
Circulates the cooling water of the engine 25 through the sub-cooling water circulation path 39.
Lower tank 1 of radiator 9 without bypassing the system
1 and the outlet pipe 43 is inserted into it to cool the cooling water.
Cooling water circulation because it was taken out directly from tank 11
Cooling water flows only to the engine 25 through the system
This results in a compact water pump without
35 ensures the required flow rate for the intercooler 37
Have the advantage that you can.

In the above embodiment, the inlet pipe 41 for the sub-cooling water circulation system 39 is inserted into the upper tank 27 separately from the cooling water inlet pipe 29. However, as in the radiator 49 shown in FIG. The inlet pipe 29 and the outlet pipe 31 are arranged on a diagonal line of the sub-cooling water circulation system 3.
And inserting the 9 side of the inlet pipe 51, the Inre'
The top pipe 51 is also used as a return port of the sub cooling water circulation system path 39.
Good.

Thus, the intended purpose can be achieved also by the cooling device using the radiator 49 as in the above embodiment.

[0027]

As described above, according to the first aspect of the present invention, regardless of whether the cooling water is introduced into the radiator from the internal combustion engine by opening and closing the valve of the thermostat, the cooling water is supplied to the water. Because the pump constantly forced circulation between the radiator and the sub-cooling water circulation system, active heat exchange between the oil in the oil cooler built into the lower tank and the cooling water became possible, preventing deterioration of the oil. became.

According to the present invention, of course, the function of the intercooler can be maintained as well as the function of the radiator for cooling the engine, and the radiator used for cooling the internal combustion engine can be maintained. Since it is also used as a cooling radiator for the intercooler, there is no need to provide a dedicated sub radiator as in the past,
Conventional problems such as space and cost can be solved. Also, the present invention provides a warp on the front side of the internal combustion engine.
With an intercooler on top of the internal combustion engine
Since it is installed, additional cooling water circulation system is added and installed
However, due to the layout of the internal combustion engine, effective use of space
Plays. Furthermore, the present invention provides a sub-cooling water circulation system.
Without bypassing the cooling water circuit of the internal combustion engine.
An outlet is provided in the lower tank of the eta to cool the cooling water.
The cooling water circulation system
Cooling water does not flow only to the internal combustion engine side
As a result, even with a compact water pump
It is possible to secure the flow rate necessary for the intercooler.
Have a point.

According to the invention of claim 2, in addition to the above-mentioned effects, there is an effect that the oil in the oil cooler can be reliably cooled.

[Brief description of the drawings]

FIG. 1 is a schematic view of a cooling device for an internal combustion engine according to an embodiment of the present invention.

FIG. 2 is a side view of an engine equipped with the cooling device shown in FIG.

FIG. 3 is a front view of a radiator used in another embodiment of the present invention.

FIG. 4 is a schematic view of an independent path of a conventional intercooler.

[Explanation of symbols]

 9, 49 Radiator 11 Lower tank 13, 15 Oil cooler 25 Engine 27 Upper tank 29, 41, 51 Inlet pipe 31, 43 Outlet pipe 35 Water pump 37 Intercooler 39 Secondary cooling water circulation system 45 Cooling passage tube

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F01P 3/20 F01P 3/18 F01P 7/16 502 F01P 11/04 F01P 11/08 F02B 29/04

Claims (2)

(57) [Scope of request for utility model registration] Between 1. A built-in oil cooler to Roatan click oil cooler built radiator and the internal combustion engine, At a cooling system of an internal combustion engine provided with a cooling water circulation system passage fitted with a thermostat, the cooling water circulating system passage And independently radiier
Equipped with an outlet directly in the lower tank of the radiator,
Forming sub-cooling water circulation system with return port on upper tank side
The sub-cooling water circulation system is used to open and close the thermostat.
Regardless, forcibly circulate the cooling water in the sub-cooling water circulation system
Attach the water pump, and further
Install an intercooler on the downstream side and
Pump on the front side of the internal combustion engine.
A cooling apparatus for an internal combustion engine, characterized in that the cooler was Installing the top of the internal combustion engine. 2. A return port and an outlet of the sub-cooling water circulation system ,
2. The cooling device for an internal combustion engine according to claim 1, wherein the cooling device is arranged near a diagonal line of the radiator.