JPS6142082B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cooling device for a water-cooled engine.

A water-cooled engine is equipped with a radiator in front of the engine and a cooling fan located behind the radiator, and the radiator is cooled by the air blown by the cooling fan and the running air, thereby cooling the engine. The above-mentioned radiator has a so-called down-flow type structure in which a heat sink tank having a cooling water inlet at one end and a lower tank having a cooling water outlet at the end opposite to the inlet are connected by a heat dissipation pipe. Many things are used. Further, there are two types of cooling fans: engine-driven ones that are interlocked with the drive shaft of the engine, and electric-powered ones.

Incidentally, in modern automobiles, the space in the engine room is becoming narrower due to weight reduction, etc., and due to this, the layout of the radiator and cooling fan may be subject to restrictions. especially,
In FF (front engine, front drive) cars, it is difficult to use an engine-driven cooling fan because the engine's drive shaft is placed sideways to the car body.
Electric type devices are often used, and due to space constraints in the engine room, they are usually placed on one side of the radiator. In this case, due to space constraints related to the arrangement of the engine, transmission, etc., the cooling fan is often provided at a position biased towards the cooling water inlet side of the radiator.

Conventionally, when a cooling fan was installed in a position that was biased towards the cooling water inlet side of the radiator,
Mainly during low-speed operation, the heat dissipation effect of the cooling water in the radiator is significantly reduced, causing the engine to easily overheat, which is a major problem. In other words, the cooling water that flows into the radiator after being heated by the engine is cooled by the forced air flow from the cooling fan and the running wind while moving from the above-mentioned atsupa tank to the lower tank through the heat radiation pipe. In this case, the cooling water passing through the heat dissipation pipes in the area where the cooling fan is not located is only cooled by the running wind. However, since the flow resistance in the Atsupa tank is small, the cooling water tends to flow linearly from the inlet side to the other end, and as a result, the closer the radiator tube is to the end opposite to the inlet, the cooler it becomes. Water tends to flow a lot. Therefore, according to the arrangement of the cooling fan with respect to the radiator, a large amount of cooling water flows into the heat dissipation pipe in the part where the cooling fan is not located.
The amount of cooling water flowing into the heat sink where the cooling fan is located decreases. For this reason, the cooling effect of the cooling fan itself is not sufficient for much of the cooling water, and there is a risk that the heat dissipation efficiency of the cooling water in the radiator will be significantly reduced, especially when the vehicle is running at low speeds with little wind.

Note that a publicly known example of radiator improvement is described in Japanese Utility Model Application Publication No. 132338/1983, but this is not intended to improve the cooling efficiency of the radiator itself, but rather to improve the cooling efficiency of the radiator itself. This secondary function has been improved by focusing on the fact that it also serves as a cooling device for electronic devices around the engine. That is, in the radiator shown in this known example, the running wind passing through a part of the radiator also serves to cool the equipment around the engine, and in this case,
If the wind from the vehicle is heated too much as it passes through the radiator, the high-temperature wind may be sent to the equipment and cause heat damage to the equipment, so the heat exchange effect in the area through which this wind passes is suppressed. In this sense, the flow rate of cooling water in this area is simply restricted. Therefore, no consideration is given to the positional relationship between the cooling fan and the radiator and the cooling efficiency of the cooling fan.

In view of these circumstances, the present invention provides a cooling type engine in which a cooling fan is disposed at a position biased toward the cooling water inlet side of the radiator, and in which the heat dissipation pipe of the radiator is installed in a portion where the cooling fan is not located. To provide a water-cooled engine cooling device that can increase the cooling efficiency of the cooling water by the cooling fan and reliably prevent engine overheating even when driving at low speeds by controlling the amount of cooling water flowing into the engine. .

That is, in the present invention, a first tank having a cooling water inlet at an end thereof and a second tank having a cooling water outlet at an end opposite to the inlet are arranged to face each other. In a water-cooled engine equipped with a radiator in which tanks are connected by heat dissipation pipes, and a cooling fan disposed at a position biased towards the inlet side of the radiator, a cooling fan is provided in the cooling water passage of the first tank. The present invention is characterized by the provision of a flow rate distribution means for controlling the amount of cooling water flowing into the heat dissipation pipes of the radiator in the non-located portions.Hereinafter, embodiments of the present invention will be described with reference to the drawings.

In Figures 1 to 3, 1 is a radiator;
2 is a cooling fan. The radiator 1 includes a first tank (atsupa tank) 11 having a cooling water inlet 12 and a second tank having a cooling water outlet 14.
tank (lower tank) 13, both tanks 11,
A large number of parallel heat dissipation tubes 15 that communicate and connect the 13...
and heat dissipation fins 16 protruding from the outer periphery of the heat dissipation tubes 15. The inlet 12 is provided at one end of the first tank 11, that is, the left end in FIG. and are connected to the inflow pipe 12' and the outflow pipe 14', respectively. Cooling water passes through the engine's water jacket and thermostat (not shown), and then flows into the inlet port 1.
2 into the first tank 11, flows through the heat radiation pipes 15 to the second tank 13, and is then sent out from the outlet 14 to a water pump (not shown). Further, the cooling fan 2 is FF
In this type of automobile, an electric fan is usually used, and is installed on the back side of the portion of the radiator 1 that is biased towards the inlet 12 side. That is, a shroud 3 is attached to the rear surface of the left half of the radiator 1 when viewed from the side shown in FIG. 2, and a cooling fan 2 is installed within the shroud 3.

In the cooling water passage 11 of the first tank 11 of the radiator 1, a flow pressure of the cooling water is provided as a flow rate distribution means for controlling the amount of cooling water flowing into the heat radiation pipes 15 of the radiator 1 in the portion where the cooling fan 2 is not located. A fluid pressure valve 17 is provided that swings in response to. The flow pressure valve 17 is for reducing the flow rate of cooling water to the heat radiation pipes 15 in the portion where the cooling fan 2 is not located when the flow rate of the cooling water flowing in from the inlet port 12 is small. Specifically, near the center of the cooling water passage 11' in the first tank 11, the upper end of the fluid pressure valve 17, which has an appropriate weight, is rotatably supported by a fixed bearing 18. Fluid pressure valve 17
When the flow pressure of the cooling water in the cooling water passage 11' on the left side is low, the flow pressure valve 17 hangs down due to its own weight and blocks the flow of cooling water in this part, and when the flow pressure of the cooling water increases, the flow pressure of the cooling water increases accordingly. The fluid pressure valve 17 is configured to be pushed open.

Next, the operation of the apparatus of the present invention will be explained based on this embodiment.

The cooling water flowing into the first tank 11 from the inlet 12 provided at one end of the first tank 11 flows through the cooling water passage 11' of the first tank 11 from the inlet 12 side to the other end. At the same time, the water gradually branches off and flows into the heat dissipation pipe 15. In this case, the flow rate of the cooling water to the portion where the cooling fan 2 is not located is restricted by the fluid pressure valve 17 as a flow rate distribution means provided in the cooling water passage 11'.

In particular, according to the fluid pressure valve 17, when traveling at low speed, the heat dissipation pipe 15 in the portion where the cooling fan 2 is located
Most of the cooling water flows to ..., increasing the cooling effect. That is, when the vehicle is idling or traveling at a low speed similar to idling, the cooling effect in the portions of the heat dissipation pipes 15 where the cooling fan 2 is not located is poor because there is little wind while the vehicle is idling. On the other hand, at this time, since the flow pressure of the cooling water flowing into the radiator 1 is low, the flow pressure valve 17
The cooling water passage 11' is drooped down due to its own weight and almost blocks the cooling water passage 11'. As a result, as shown by the solid line arrows in FIGS. 2 and 3, most of the cooling water is transferred to the cooling fan 2.
The air flows into the heat dissipation pipe 15 in the portion where the cooling fan 2 is located, and is sufficiently cooled by the forced air flow of the cooling fan 2.

Furthermore, when running at a relatively high speed, as the flow pressure of the cooling water increases, the flow pressure valve 17 opens and moves to the side where the cooling fan 2 is not located, as shown by the two-dot chain line in FIGS. 2 and 3. Cooling water also flows, but at this time there is also a lot of wind when the vehicle is running, so that a sufficient cooling effect can be obtained from the wind when the vehicle is running. By changing the opening degree of the fluid pressure valve 17 according to the flow pressure of the cooling water corresponding to the traveling speed, efficient cooling can be performed that matches the strength of forced air and blown air by the cooling fan 2. It will be carried out.

FIG. 4 shows another embodiment of the present invention, in which a baffle plate 19 is provided in the cooling water passage 11' of the first tank 11 of the radiator 1 as a flow rate distribution means provided in the cooling water passage 11'. It is protruding from the The arrangement position of the baffle plate 19 and other configurations are the same as in the first embodiment.

Even with this structure, the cooling water passage 11' of the first tank 11 is narrowed by the baffle plate 19, so that the amount of cooling water flowing to the part where the cooling fan 2 is not located is suppressed. The amount of cooling water distributed to the heat dissipation pipe 15 in the portion where is located is increased.

FIG. 5 shows yet another embodiment of the present invention, in which the above-mentioned first
In addition to the fluid pressure valve 17 used in the embodiment, a bimetal 20 is provided to control the opening degree of the fluid pressure valve 17 depending on the cooling water temperature. The bimetal 20 has a curved plate shape with one end fixed to the fixed bearing 18 and the other end fixed to the fluid pressure valve 17, and is configured to open the fluid pressure valve 17 when the cooling water temperature is low. Furthermore, this bimetal 20 has spring properties so that the flow pressure valve 17 can be opened and closed in response to the flow pressure of the cooling water.

According to this structure, the opening and closing action of the flow pressure valve 17 according to the flow pressure of the cooling water is basically the same as in the first embodiment, but even when the flow pressure of the cooling water is low, the flow pressure of the cooling water is When the temperature is lower than that during normal operation, the fluid pressure valve 17 is forcibly opened. This serves to prevent overcooling during warm-up operation and to promote warm-up operation. This structure is not so necessary when an electric fan is used as the cooling fan 2 and the electric fan is controlled according to the cooling water temperature, but even in front-wheel drive vehicles, the cooling fan may be engine-driven. Furthermore, even in FR (front engine, rear drive) type automobiles, an engine-driven cooling fan may be installed in the arrangement shown in FIGS. 1 and 2, so this method is effective in these cases.

As explained above, according to the cooling device of the present invention, in a water-cooled engine in which a cooling fan is provided at a position biased toward the cooling water inlet side of the radiator, the heat dissipation pipe of the radiator in the portion without the cooling fan is unnecessary. Even during low-speed operation with little wind, a large amount of cooling water can be flowed through the heat dissipation pipes in the area that receives forced air from the cooling fan to sufficiently enhance the heat dissipation effect. Therefore, the cooling efficiency of the cooling water in the radiator is greatly increased, and the engine has excellent effects such as being able to reliably prevent overheating.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a perspective view of a radiator and a cooling fan, Fig. 2 is a partially cutaway elevational view of the same, and Fig. 3 is an enlarged vertical sectional view of the main part.
FIG. 4 is an enlarged vertical sectional view of the main part showing another embodiment;
FIG. 5 is an enlarged vertical cross-sectional view of the main part showing still another embodiment. 1...Radiator, 2...Cooling fan, 11...
...Radiator first tank, 12...Cooling water inlet, 13...Second tank, 14...Cooling water outlet, 15...Radiator pipe, 17...Flow pressure valve, 19...
Batsuful board.

Claims (1)

[Scope of Claims] 1. A first tank having a cooling water inlet at an end thereof and a second tank having a cooling water outlet at an end opposite to the inlet are arranged to face each other. In the water-cooled engine, the water-cooled engine includes a radiator in which both tanks are connected by a heat dissipation pipe, and a cooling fan disposed at a position biased toward the inlet side of the radiator.
A cooling device for a water-cooled engine, characterized in that a cooling water passage of a tank is provided with a flow rate distribution means for controlling the amount of cooling water flowing into a heat radiation pipe of a radiator in a portion where a cooling fan is not located. 2 The flow distribution means receives the flow pressure of the cooling water in the cooling water passage of the first tank and distributes the flow of cooling water to the heat dissipation pipe of the radiator in a portion where the cooling fan is not located when the flow rate of the cooling water flowing in from the inlet is small. The cooling device for a water-cooled engine according to claim 1, characterized in that the cooling device is a fluid pressure valve that reduces the flow rate of cooling water.