JP2003074348A - Cooling device of internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase a combustion performance and a fuel consumption performance with a simple structure by rapidly increasing the temperature of a cylinder block 12 when a machine is cooled, and rapidly reduce a friction by rapidly increasing the temperature of engine oil. SOLUTION: The cylinder block 11 and a cylinder head 12 are installed, parallel with each other, on the downstream side of a water pump. A radiator 13 and an oil cooler (auxiliary heat exchanger) 14 are installed, parallel with each other, on the upstream side of the water pump. A cooling water regulating valve 30 is installed to cut out a block side outlet passage 21 for cooling water flowing out of the cylinder block 11 and cut out an auxiliary inlet passage 24 for cooling water flowing into an oil cooler 14.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a cooling device for an internal combustion engine.

[0002]

2. Description of the Related Art In an environment where the engine oil is frequently used at high speed such as Europe and the Middle East, the temperature of the engine oil may be too high. Therefore, a cooling device for an internal combustion engine is known in which an oil cooler (sub heat exchanger) for cooling engine oil is arranged in a circuit in which cooling water circulates. FIG. 4 shows a circuit configuration of a cooling device for an internal combustion engine described in Japanese Utility Model Laid-Open No. 6-37523. As shown in the figure, a radiator 7 is arranged on the upstream side of the water pump 1 for supplying cooling water, and an oil cooler 2, a cylinder block 3 and a cylinder head 4 are provided on the downstream side of the water pump 1. Are arranged in series.
A thermostat valve 5 is interposed between the cylinder head 4 and the radiator 7, and the thermostat valve 5
When the temperature is low, the cooling water is circulated through the bypass passages 9 and 6 to shut off the flow of the cooling water to the engine (internal combustion engine) including the cylinder block 3 and the cylinder head 4 and the radiator 7. It is designed to accelerate the temperature rise.

[0003]

However, in the circuit configuration in which the cylinder block 3 and the cylinder head 4 are connected in series, the temperature rise of the cylinder block is delayed even if the flow to the engine is shut off when the engine is cold. Fuel consumption may be reduced. Therefore, a cylinder head and a cylinder block are installed side by side on the downstream side of the water pump, and for example, by blocking the flow of only the cylinder block at the time of cooling, the temperature rise of the cylinder block is accelerated, warming up is promoted, and fuel consumption is improved. A two-system type cooling device is known.

However, even in such a two-system type cooling device, if the cooling water circulates through the oil cooler at the time of cooling, etc., the temperature rise of the engine oil will be delayed and the friction will increase. In addition, since the cooling water constantly circulates in the oil cooler, the heat capacity increases and there is concern that the heater performance will deteriorate.

The present invention has been made in view of the above problems, and it is an object of the present invention to provide a novel cooling device for an internal combustion engine, which has a simple structure and can quickly raise the temperature of the cylinder block when the engine is cold. It has one purpose.

Another object of the present invention is to raise the temperature of the cylinder block and the temperature of the engine oil when the engine is cold, etc., with a simple structure.

[0007]

A cooling device for an internal combustion engine according to the present invention is provided with a water pump for supplying cooling water to a cooling water circulation circuit in which the cooling water circulates, and a water pump arranged in parallel downstream of the water pump. A cylinder block and a cylinder head, and a radiator and an auxiliary heat exchanger that are arranged in parallel on the upstream side of the water pump. Further, it is characterized by having a cooling water regulating valve for blocking the block side outlet passage of the cooling water flowing out from the cylinder block and at the same time blocking the sub inlet passage of the cooling water flowing into the sub heat exchanger.

[0008] Typically, the cooling water regulating valve includes a first valve body that opens and closes the block side outlet passage, a second valve body that opens and closes the sub inlet passage, and the first valve body and the second valve body. Valve bodies are installed at intervals from each other, and actuating bodies move along a block-side outlet passage and a sub-inlet passage arranged substantially on the same axis. That is, it has a simple structure in which both the first valve body and the second valve body are attached to one actuating body.

More preferably, the cooling water regulating valve is a thermostat valve having a simple structure which operates according to the water temperature.

The sub heat exchanger is typically an oil cooler that cools engine oil, or an EGR valve that is cooled and heated by cooling water.

[0011]

As described above, according to the present invention, the cooling water flow of the cylinder block and the cooling water of the sub heat exchanger such as an oil cooler are provided when the cooling water has a low temperature even though the structure is simple. The flow and the flow can be interrupted simultaneously and individually. Therefore, it is possible to quickly raise the temperature of the cylinder block to improve the combustion performance and fuel efficiency performance, and at the same time, quickly raise the temperature of the oil cooler, that is, the engine oil to reduce the friction quickly.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a cooling device for an internal combustion engine according to the present invention will be described below with reference to the drawings.

FIG. 3 shows the construction of a cooling water circulation circuit through which cooling water circulates. At the downstream side of the water pump 10 that supplies the cooling water, the cylinder head 11 to be cooled is provided.
And a cylinder block 12 are arranged side by side, and a radiator 13 for cooling the cooling water is provided upstream of the water pump 10.
And an oil cooler 14 for cooling the engine oil are arranged in parallel. Radiator 13 and water pump 10
A temperature-sensitive auxiliary thermostat 15 is provided between the auxiliary thermostat 15 and the radiator 13.
A bypass passage 16 is connected to branch off the upstream side of the radiator 13 and bypass the radiator 13. In the present embodiment, the block outlet passage 22 of the cooling water flowing out from the cylinder block 12 is blocked, and at the same time the oil cooler 14 is blocked.
A cooling water adjusting valve 30 is provided to shut off the sub-inlet passage 24 for the cooling water flowing into the cooling water adjusting valve 30.

FIGS. 1 and 2 are cross-sectional views of the vicinity of the cooling water adjusting valve 30. The head outlet passage 21 of the cooling water flowing out from the cylinder head 11 is connected to a main inlet passage 23 of the cooling water flowing into the radiator 13. The block outlet passage 22 and the sub-inlet passage 24 are connected to the connecting portions 25 of the passages 21 and 23, respectively. That is, the downstream opening end 22 a of the block outlet passage 22 is open on the inner wall surface of the connecting portion 25, and the upstream opening end 24 a of the sub inlet passage 24 is open. These block outlet passage 22 and auxiliary inlet passage 24
And are arranged in series on substantially the same axis with the connecting portion 25 interposed therebetween.

The cooling water adjusting valve 30 is a so-called thermostat valve, which operates according to the water temperature and operates the first rod 3.
It has a heat sensitive portion 32 for driving 1 to move back and forth. A second rod 33 is fixed to the heat-sensitive portion 32, and the heat-sensitive portion 32 and the second rod 33 are arranged on substantially the same axis along the block outlet passage 22 and the sub-inlet passage 24. It operates as one actuating body 40 that moves integrally along the. A first valve body 34 that opens and closes the downstream opening end 22a of the block outlet passage 22 is attached to the heat-sensitive portion 32, and an upstream opening end 24a of the auxiliary inlet passage 24 is opened and closed to the second rod 33. Second valve body (bottom valve) 3
5 is attached. That is, the first valve body 34 and the second valve body 35 are attached to the actuation body 40 with a space therebetween.

More specifically, the valve seat portion 37 provided on the housing 36 of the cooling water adjusting valve 30 is provided with the downstream opening end portion 22.
It is attached to a. This valve seat portion 37 has the above-mentioned first
A spring 38 is interposed between the housing 36 and the first valve body 34 so that the valve body 34 can be seated well. The spring for the second valve body 35 is not shown.

The second valve body 35 is set so as to enter the auxiliary inlet passage 24 when the valve is opened as shown in FIG.
The outer diameter of the second valve body 35 is set to be smaller than the inner diameter of the auxiliary inlet passage 24 and further the outer diameter of the first valve body 34.

Cylinder head 11 as when starting the cold machine
In a low temperature state where the temperature of the cooling water flowing out from the cylinder block 12 on the engine outlet side is lower than a predetermined set temperature, as shown in FIG. 1, the first rod 31 is pulled toward the heat sensitive portion 32 side, and the first valve body At the same time that the downstream opening end 22a of the block outlet passage 22 is closed by 34, at the same time as the second valve body 3
5, the upstream opening end 24a of the sub inlet passage 24 is closed. Thereby, while the cooling water circulates through the cylinder head 11 and the head outlet passage 21, the flow of the cooling water through the cylinder block 12 and the oil cooler 14 is blocked simultaneously and individually.

In this way, by blocking the flow of the cooling water through the cylinder block 12, the cylinder block 12 of the engine in which the cylinder (not shown) is formed is formed.
The temperature can be raised rapidly, and the warm-up performance of the engine is improved, so that combustion performance and fuel efficiency performance can be improved. At the same time, the supply of the cooling water to the oil cooler 14 is also cut off, so that the engine oil can be quickly raised in temperature, the friction can be quickly reduced, and the cooling water is not circulated in the oil cooler 14. Since the heat capacity is reduced, the water temperature can be raised quickly and the heater performance can be improved. In such a low temperature state, since the temperature of the engine oil is generally low, it is not necessary to cool the oil cooler 14, and even if the cooling water flow passing through the oil cooler 14 is cut off as described above, there is no problem. Absent.

Further, even when both valve bodies 34 and 35 are closed as described above, the connecting portion 25 in which the cooling water constantly circulates from the head outlet passage 21 to the main inlet passage 23.
Since the heat-sensitive part 32 is disposed in the, the water temperature can be sensed appropriately.

When the temperature of the cooling water on the engine outlet side reaches a predetermined set temperature and is in a state after warming up, as shown in FIG.
The first rod 31 projects from the heat-sensitive portion 32. Since the tip of the first rod 31 is in contact with the housing 36, the actuating member 40 including the heat sensitive portion 32 and the second rod 33 is provided.
Moves downward in FIG. As a result, the first valve body 34 and the second valve body 35 open simultaneously. As a result, the block outlet passage 22 and the main inlet passage 23 (and the auxiliary inlet passage 24)
And the cooling water circulate in the cylinder block 12, the cylinder block 12 is appropriately cooled. Further, the head outlet passage 21 (and the block outlet passage 22) and the sub inlet passage 24 communicate with each other, and the oil cooler 14
By circulating the cooling water inside, the oil cooler 14 is appropriately cooled.

As described above, in this embodiment, the thermostat type cooling water adjusting valve 30 having a simple structure in which the two valve bodies 34 and 35 are attached to the one operating body 40 is used to cool the engine when the engine is started. At the same time, the cylinder block 12 can be quickly heated to improve combustion performance and fuel efficiency, and at the same time, the oil cooler 14, that is, the engine oil can be quickly heated to reduce friction. .

Although the cooling water adjusting valve 30 of this embodiment is a thermostat valve, the present invention is not limited to this. For example, an electromagnetic on-off valve is also possible.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of essential parts showing a cold state in a cooling device for an internal combustion engine according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of essential parts showing a state after warming up in the cooling device of FIG.

FIG. 3 is a configuration diagram showing a circuit configuration of a cooling device according to the present embodiment.

FIG. 4 is a configuration diagram showing a circuit configuration of a cooling device according to a conventional example.

[Explanation of symbols]

10 ... Water pump 11 ... Cylinder head 12 ... Cylinder block 13 ... Radiator 14 ... Oil cooler 21 ... Head exit passage 22 ... Block exit passage 23 ... Main entrance passage 24 ... Sub entrance passage 30 ... Cooling water adjustment valve 34 ... First valve body 35 ... Second valve body 40 ... Actuator

Claims (4)

[Claims] 1. A water pump for supplying cooling water to a cooling water circulation circuit in which cooling water circulates, a cylinder block and a cylinder head arranged in parallel on the downstream side of the water pump, and an upstream side of the water pump. In a cooling device for an internal combustion engine, which is provided with a radiator and a sub heat exchanger arranged in parallel, a block side outlet passage of the cooling water flowing out from the cylinder block is blocked, and at the same time, a cooling water sub flow flowing into the sub heat exchanger is A cooling device for an internal combustion engine, comprising a cooling water regulating valve for shutting off an inlet passage. 2. The cooling water regulating valve includes a first valve body that opens and closes the block side outlet passage, a second valve body that opens and closes the sub inlet passage, and the first valve body and the second valve body. 2. An internal combustion engine according to claim 1, further comprising: an actuating member that is mounted at a distance from each other and that moves along a block-side outlet passage and a sub-inlet passage that are arranged on substantially the same axis. Cooling system. 3. The cooling device for an internal combustion engine according to claim 1, wherein the cooling water regulating valve is a thermostat valve that operates according to the water temperature. 4. The sub heat exchanger is an oil cooler for cooling engine oil.
4. A cooling device for an internal combustion engine according to any one of 3 above.