JPH0874576A - Cooling system - Google Patents

Abstract

PURPOSE: To shorten a span of water filling time at the change of cooling water, and to make both water filling and air bleeding operations advanceable from the side of a radiator, in such a system constitution that the radiator and an engine body are largely apart from each other and there is a hanging part in a pipeline lying between both of them. CONSTITUTION: This cooling system cools an engine body 7 in circulating a flow of cooling water through pipes 14 and 15 and so on in space between this engine body 7 and a radiator 12. A reservoir tank 18 with a filler hole 20 for water filling is set up upwards the radiator 12 and interconnected. This cooling system is provided with a pipe 25 interconnecting an interval between an uppermost part of a water passage in the engine body 7 and the reservoir tank 18, while a hanging part 25a being lower than the water passage of the engine body and an uppermost position of the allowable water level of the reservoir 18 is installed in the point midway in the pipe 25. In addition, a selector valve 26 for selectively interconnecting the water passage in the engine body to the reservoir tank 18 and the atmosphere is installed in the midway of the pipe 25.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-cooling type cooling device provided for an engine of an automobile or the like, and more particularly to a cooling device with improved cooling water pouring.

[0002]

2. Description of the Related Art Conventionally, for example, an engine for an automobile is provided with a water cooling type cooling device. This device is equipped with a radiator for heat exchange, a pump for water pressure feeding, piping and the like. Then, by operating the pump in conjunction with the operation of the engine, the cooling water is forcibly circulated through the water passage provided between the engine body, the pipe and the radiator. By the circulation of the cooling water, the engine body is cooled by the cooling water, and the radiator dissipates the heated water. In this device, the cooling water deteriorates with the passage of time, and therefore the cooling water is replaced as needed.

Here, in order to replace the cooling water, if the cooling device is of a type in which the water passage is completely sealed, it is provided on the upper part of a radiator (the same tank having a reservoir tank) or the like. Water will be injected from the injection port. In this case, since air has accumulated in the water passage, it is necessary to remove the air. Therefore, normally, water is once poured until the radiator is filled with cooling water, and then the air accumulated in the engine body and the water passage is gradually moved to the radiator side (reservoir tank side). This allows
The water level in the radiator (reservoir tank) drops,
Since the water level in the engine body rises, the cooling water is injected into the radiator (reservoir tank) by that amount, and then the engine is operated again to inject the cooling water into the water passage. By repeating this procedure, the entire water passage is filled with cooling water. Therefore, when replacing the cooling water, it takes time to remove air, and as a result, the water injection time is long.

Therefore, a cooling device for coping with such a problem is disclosed in Japanese Utility Model Laid-Open No. 57-81432. In this cooling device, as shown in FIG. 4, the water passage 4 that is closed between the engine body 41 and the radiator 42.
3 are formed. The engine body 41 and the radiator 42 are provided with inlets 46 and 47 that are opened and closed by caps 44 and 45, respectively. In the engine main body 41, an air vent hole 48 that connects the water passage 43 and the atmosphere is provided near the inlet 46. This hole 48 can be opened and closed according to the operation of the cap 44. Here, it is assumed that the injection port 47 of the radiator 42 is located higher than the injection port 46 of the engine body 41.

In this structure, in order to inject the cooling water into the cooling device, the caps 44 and 45 of both the engine body 41 and the radiator 42 are removed in advance, and both the injection ports 46 and 4 are introduced.
7 and the hole 48 are opened. Then, by pouring water from the inlet 47 of the radiator 42, the water is circulated from the radiator 42 to the engine body 41. At this time, the air accumulated in the water passage 43 of the engine main body 41 is pushed out to the atmosphere through the hole 48, and the air is satisfactorily removed. After that, after the water passage 43 of the engine body 41 is filled with the cooling water, the inlet 44 is filled with the cap 44.
6 and the hole 48 are closed. And the inlet 4 of the radiator 42
Water is continuously supplied from 7, and when the radiator 42 is filled with cooling water, the inlet 47 is closed with the cap 45. In this way, by using both the inlet 47 of the radiator 42 and the hole 48 of the engine main body 41 for bleeding air, the time required for bleeding air is shortened, and thus the time required for water injection is shortened.

[0006]

However, in the configuration of the conventional cooling device described above, the engine body 41 and the radiator 4 are arranged.
When 2 and 2 were arranged far apart from each other, the water injection work became inconvenient. Particularly, in a so-called "one-box car", the engine body is arranged under the floor of the vehicle body (especially under the seat), the radiator is arranged on the front side of the vehicle body, and the two are connected by a relatively long pipe. Moreover, it is necessary to secure a space for placing a foot adjacent to the seat between the engine body and the radiator, and therefore, it is necessary to provide a low floor. As a result, between the radiator and the engine body, the piping must be routed to a position lower than the highest position of the allowable water level in both.

Therefore, such a "one-box car"
When the conventional cooling device is applied to the radiator, the inlet of the radiator and the inlet of the engine body are isolated from each other, and the caps of both inlets cannot be operated from the radiator side, that is, the front side of the vehicle body. Have difficulty. Therefore, in order to operate the cap of the engine body, it is necessary to provide a special handling hole under the floor of the vehicle body and use it, or use a handling hole originally provided for repairing the engine body. Here, a hood that can be opened and closed corresponding to the radiator is provided on the front side of the vehicle body. Therefore, when exchanging the cooling water, it is necessary to operate the two caps with the hood opened and the handling hole opened, which is not good in terms of workability.

The present invention has been made in view of the above-mentioned circumstances, and an object thereof is to dispose a radiator and an engine body at a great distance from each other, and a pipe between them has a low hanging portion. In the configuration, when replacing the cooling water, it is possible to shorten the water injection time,
Moreover, it is an object of the present invention to provide a cooling device that enables both water injection and air bleeding operations from the radiator side.

[0009]

In order to achieve the above object, in the present invention, the engine body is cooled by circulating cooling water through a water passage between the engine body and the radiator. Is a water-cooling type cooling device, which is arranged above the radiator and communicates with the radiator, and also communicates between a tank having an injection port for water injection and the uppermost part of the water passage in the engine body and the tank. In a cooling device that is provided with a pipe, and the pipe is provided with a water passage in the engine body and a hanging portion that is arranged at a position lower than the uppermost position of the allowable water level in the tank, in the engine body in the middle of the pipe. The purpose is to provide selective communication means for selectively communicating the water passage of (1) with the tank and the atmosphere.

[0010]

According to the above construction, when the cooling water is replaced,
The water passage in the engine body is communicated with the atmosphere by the selective communication means. In this state, by injecting cooling water from the inlet of the tank, the cooling water flows from the radiator to the engine body through the water passage. Then, the air accumulated in the water passage in the engine body is pushed out to the atmosphere from the pipe through the selective communication means.

After that, when the cooling water comes out to the atmosphere from the selective communication means, the selective communication means is switched to communicate the water passage in the engine body with the tank. In this state,
Among the cooling water circulating in the water passage between the engine body and the radiator, a part of the cooling water flowing through the water passage in the engine body returns to the tank through the pipe.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the cooling device of the present invention is applied to a "one box car" and embodied will be described in detail below with reference to FIGS.

1 and 2 are schematic configuration diagrams showing a cooling device arranged in a "one box car". In this example,
A seat 3 is provided on the floor 2 of the vehicle body 1, and a radiator room 4 is provided on the front side of the vehicle body 1. Further, on the front side of the seat 3, a floor 2a is formed so as to fall downward so as to secure a footrest space 5 for a seated person to place his / her feet. A hood 6 that covers the radiator room 4 in an openable and closable manner is provided on the front side of the vehicle body 1.

An engine body 7 is disposed below the floor 2 corresponding to the seat 3. Here, the engine body 7 includes a cylinder block 7a and a cylinder head 7b. The uppermost part of the engine body 7 is arranged higher than the floor 2a corresponding to the footrest space 5. Inside the engine body 7, a water passage (not shown) such as a water jacket for circulating cooling water is formed. The inlet portion 8 of this water passage is provided in the lower front portion of the engine body 7, and the inlet portion 8 is provided with a pump 9 for pumping cooling water. The pump 9 is driven in association with the operation of the engine. Further, the outlet portion 10 of the water passage is the engine body 7
It is provided on the upper front side of. The inlet 8 and the outlet 10 are connected by a communication passage 11. Since a thermostat is provided in the communication passage 11, it is not normally in a communication state.

A radiator 12 for heat exchange and a fan 13 for cooling the radiator 12 are arranged in the radiator room 4. The fan 13 is driven by an electric motor (not shown). As a method of driving the fan 13, there are a type of driving by a propeller shaft extending from the engine body 7 and a type of driving by a hydraulic motor. First and second main pipes 14 and 15 are arranged between the radiator 12 and the engine body 7. The first main pipe 14 is connected between the outlet 16 of the radiator 12 and the inlet 8 of the engine body 7. The second main pipe 15 is connected between the outlet portion 10 of the engine body 7 and the inlet portion 17 of the radiator 12. Both pipes 14 and 15 together with the water passage in the radiator 12 and the engine body 7 constitute a water passage for circulating cooling water. A part of both pipes 14 and 15 is provided with an outlet 10 of the engine body 7 and an inlet 17 of the radiator 12.
It is located lower than. In particular, the middle of the second main pipe 15 is arranged around the lower side of the floor 2a corresponding to the footrest space 5. In this routing part, a part of the pipe 15 hangs downward,
That portion is called a hanging portion 15a.

Therefore, the cooling water that has passed through the radiator 12 flows to the engine body 7 through the first main pipe 14, passes through the water passage in the engine body 7, and then returns to the radiator 12 through the second main pipe 15. It is possible.

A reservoir tank 18 is arranged near the radiator 12. This reservoir tank 18 is arranged above the radiator 12, and the connection pipe 1
It communicates with the inlet part 17 of the radiator 12 through 9. In addition, the reservoir tank 18 has an inlet 2 for water injection.
0 is provided, and a cap 21 that closes the inlet 20 is detachably attached. A cap 21 having a function of a pressure valve is attached to the injection port 20. According to the cap 21, when the pressure in the reservoir tank 18 becomes equal to or higher than a predetermined value, the reservoir tank 18
The inside of is communicated with the atmosphere through the communication pipe 22. Cooling water is injected into the reservoir tank 18 from the inlet 20 when the cooling water of the cooling device is replaced. The reservoir tank 18 has a function of absorbing a change in liquid volume due to a change in temperature of the cooling water and a function of a gas-liquid separator for separating air contained in the cooling water.

A two-way valve 23 is provided in the middle of the connecting pipe 19.
Is provided. This two-way valve 23 has one flow path 23
a and one check valve 23b. Then, when the cooling water flows from the reservoir tank 18 to the radiator 12, the check valve 23b opens, and the check valve 23b and the flow path 23a.
Cooling water flows through. On the other hand, when the cooling water flows from the radiator 12 to the reservoir tank 18, the check valve 2
3b is closed and the cooling water flows only through the flow path 23a.

Further, the engine body 7 and the reservoir tank 1
A first bypass pipe 24 and a second bypass pipe 25 as a pipe in the invention are arranged between the first bypass pipe 24 and the first bypass pipe 8. The first bypass pipe 24 is connected between the reservoir tank 18 and the inlet portion 8 of the engine body 7. The second bypass pipe 25 is connected between the outlet portion 10 of the engine body 7 and the reservoir tank 18, and connects the uppermost part of the water passage in the engine body 7 and the reservoir tank 18. . Both pipes 24, 2
Reference numeral 5 constitutes a water passage in the reservoir tank 18 and the engine body 7, together with a water passage for circulating cooling water. The middle of both pipes 24, 25 is routed under the floor 2a corresponding to the footrest space 5 and is located at a position lower than the uppermost position of the allowable water level in the water passage in the engine body 7 and the reservoir tank 18. Have been routed to. In this routed portion, as with the second main pipe 15, a part of both pipes 24, 25 hangs downward, so that part is referred to as a hanging portion 24a, 25a.
Here, the inner diameters of both bypass pipes 24 and 25 are set relatively smaller than the inner diameters of both main pipes 14 and 15. The inner diameters of both bypass pipes 24 and 25 are set to be substantially the same as the diameter of the flow path 23a of the two-way valve 23.

Therefore, the cooling water in the reservoir tank 18 is passed through the first bypass pipe 24 to the engine body 7.
To the second after passing through the water passage in the engine body 7.
It is possible to return to the reservoir tank 18 through the bypass pipe 25.

A major feature of the cooling device of this embodiment is that, at a position adjacent to the reservoir tank 18, some switching valve 26 constituting the selective communication means of the present invention is provided in the middle of the second bypass pipe 25. Is provided. The switching valve 26 is for selectively connecting the water passage in the engine body 7 to the reservoir tank 18 and the atmosphere. The switching valve 26 is a three-way valve, and a second bypass pipe 25 extending from the outlet 10 of the engine body 7 is connected to the first port 26a of the switching valve 26. A second bypass pipe 25 extending from the reservoir tank 18 is connected to the second port 26b. Furthermore, the third port 26c is open to the atmosphere. In the switching valve 26, the bent flow path 2
6d is provided, and both ends of the flow path 26d are provided at each port 26
It is possible to selectively communicate with a to 26c. The switching valve 26 is provided with a lever 27 protruding outward. Then, by operating the lever 27, as shown in FIG. 1, a first position for communicating the internal flow path 26d with the first and second ports 26a, 26b, and
As shown in FIG. 2, it is possible to switch between the flow path 26d and the second position where the flow path 26d communicates with the first and third ports 26a and 26c.

The above is the basic configuration of the cooling device in this embodiment. In this cooling device, drain holes (not shown) are provided on the lower side of the radiator 12 and the engine body 7, and drain caps for closing both holes are provided. Then, by removing those caps, the cooling water can be drained from the water passage of the cooling device.

Therefore, in the above structure, in order to use the cooling device for normal use, as shown in FIG.
The flow passage 26d of No. 6 is switched to the first position, and the water passage in the engine body 7 is connected to the reservoir tank 18 through the second bypass pipe 25 and the switching valve 26. In this state, when the engine is operated and the pump 9 is operated,
Cooling water is forcedly circulated through the water passage between the engine body 7, the main pipes 14 and 15 and the radiator 12. By the circulation of the cooling water, the engine body 7 is cooled by the cooling water, and the radiator 12 dissipates the heated water. At this time, part of the cooling water in the radiator 12 returns to the reservoir tank 18 through the connection pipe 19 and the two-way valve 23 due to the pressure balance in the cooling device. The cooling water in the reservoir tank 18 passes through the first bypass pipe 24 and the engine body 7
Flows to. Due to the pressure balance in the cooling device, part of the cooling water in the engine body 7 is
5 and the switching valve 26 to return to the reservoir tank 18.

On the other hand, in the structure of this cooling device, in order to exchange the cooling water, the cooling water is completely drained in advance from the above-mentioned two drain holes. Then, as shown in FIG.
The flow path 26d of the switching valve 26 is switched to the second position, and the water passage in the engine body 7 is connected to the atmosphere through the second bypass pipe 25 and the switching valve 26. In this state,
When cooling water is injected from the injection port 20 of the reservoir tank 18, a part of the cooling water is connected to the connection pipe 19 and the two-way valve 2.
3 to the radiator 12. The cooling water that has flowed to the radiator 12 flows to the engine body 7 through both main pipes 14 and 15. Furthermore, a part of the cooling water injected into the reservoir tank 18 is partially removed from the first bypass pipe 24.
Through to the engine body 7. Then, the air accumulated in the water passage in the engine body 7 is pushed out to the atmosphere through the second bypass pipe 25 and the switching valve 26 based on the water pressure applied to the reservoir tank 18. The air can be pushed out even if the hanging portions 15a, 24a, 25a are provided in the middle of the pipes 15, 24, 25. As a result, the air accumulated in the water passage of the cooling device can be easily removed in a short time. At this time, it is not necessary to operate the engine to drive the pump 9.

After that, when the cooling water starts to flow from the switching valve 26 to the atmosphere, the switching valve 26 is switched to the first position to connect the water passage in the engine body 7 to the reservoir tank 18. By this operation, the cooling device is returned to the normal use condition.

As described above, in the cooling device applied to the "one-box car" of this embodiment, the radiator 12 and the engine body 7 are arranged at a great distance from each other, and further, between each of them 12, 7. Pipes 15, 24, 2
5 has a low position for the hanging portions 15a, 24a, 25a.
There is. However, nevertheless, according to this cooling device, since the air can be easily removed as described above, the water injection time can be significantly shortened when the cooling water is replaced. Moreover, both the work of injecting water from the inlet 20 of the reservoir tank 18 and the operation of the switching valve 26 for venting and releasing the air can be performed from the radiator room 4 side. In that sense, it is possible to improve work efficiency related to replacement of cooling water.

In addition, in this embodiment, when pouring water into the reservoir tank 18, the cooling water flows through both the flow path 23a and the check valve 23b of the two-way valve 23.
A large amount of cooling water can be flowed to the radiator 12. Therefore, in that sense, the time for injecting the cooling water can be further shortened. In the two-way valve 23, when the cooling water flows from the radiator 12 to the reservoir tank 18, the cooling water flows only in the flow path 23a, so that the flow path 23a functions as a throttle when the cooling device is normally used. . As a result, a large amount of cooling water does not return from the radiator 12 to the reservoir tank 18.

The present invention can be embodied in the following other embodiments. In another example below,
It is possible to obtain the same actions and effects as those of the above-mentioned embodiment. (1) In the above embodiment, the single switching valve 26 provided in the middle of the second bypass pipe 25 constitutes the selective communication means in the present invention. On the other hand, as shown in FIG. 3, the auxiliary pipe 2 is provided in the middle of the second bypass pipe 25.
5b is connected in a T shape, and the first and second two-way valves 29, 30 provided in the middle of the pipes 25, 25b constitute a selective communication means. When the water passage in the engine body 7 is communicated with the reservoir tank 18, the first
In the case of opening the two-way valve 29 and closing the second two-way valve 30 to connect the water passage in the engine body 7 to the atmosphere,
The two-way valve 29 may be closed and the second two-way valve 30 may be opened.

(2) In the above embodiment, the reservoir tank 1
Although the two-way valve 23 is provided in the connecting pipe 19 between the radiator 8 and the radiator 12, this can be omitted. (3) In the embodiment, the cooling device is applied to the "one-box car" and is embodied. However, the invention is not limited to this, and the engine body and the radiator are widely separated from each other like a bus or a truck. It can be embodied by arranging it, particularly by applying it to a vehicle in which the engine body is arranged under the floor.

Although the respective embodiments of the present invention have been described above, it is noted that the respective embodiments include the following various embodiments relating to the technical idea described in the scope of claims. The effect is described in.

(A) In the invention described in claim 1, a two-way valve for increasing the flow of cooling water from the tank to the radiator more than the flow of cooling water from the radiator to the tank is provided between the radiator and the tank. Cooling device provided.

According to this structure, the water injection time can be further shortened when the cooling water is replaced in the cooling device. In this specification, means, members and the like relating to the constitution of the invention are defined as follows.

(A) The radiator means a heat exchanger for lowering the temperature of the cooling water received from the engine body.

[0034]

According to the first aspect of the present invention, the uppermost portion of the water passage in the engine body and the tank above the radiator are communicated with each other, and the water passage in the engine body and the allowable water level of the tank are connected. A selective communication means for selectively communicating the water passage in the engine body with the tank and the atmosphere is provided in the middle of the pipe having the hanging portion with respect to the uppermost position.

Accordingly, the cooling water flows from the radiator to the engine body through the water passage by injecting the cooling water from the inlet of the tank by connecting the water passage in the engine body to the atmosphere by the selective communication means. At this time, the air accumulated in the water passage in the engine body is pushed out to the atmosphere from the pipe through the selective communication means. After that, by switching the selective communication means to communicate the water passage in the engine body with the tank, a part of the cooling water in the engine body returns to the tank through the pipe. As a result, the radiator and the engine body are arranged at a large distance from each other, and even in a configuration having a low hanging portion in the pipe between them,
It is possible to shorten the water injection time when replacing the cooling water,
Moreover, the effect of being able to perform both water injection and air bleeding operations from the radiator side is demonstrated.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a cooling device provided for a “one-box car” according to an embodiment of the present invention.

[Fig. 2] Similarly, according to one embodiment, "one box car"
It is a schematic block diagram which shows the cooling device arrange | positioned at.

FIG. 3 is a schematic view showing another selective communication means in the second bypass pipe according to another embodiment of the present invention.

FIG. 4 is a cross-sectional view showing a conventional cooling device.

[Explanation of symbols]

Reference numeral 7 ... Engine body, 12 ... Radiator, 14 ... First main pipe, 15 ... Second main pipe (14 and 15 form a water passage), 18 ... Reservoir tank, 25
... second bypass pipe as piping, 25a ... hanging portion, 26 ... switching valve as selective communication means, 29 ... first two-way valve, 30 ... second two-way valve (29 and 30 are selective communication means) Is configured).

Claims (1)

[Claims] 1. A water-cooled cooling device configured to cool an engine body by circulating cooling water through a water passage between the engine body and the radiator, the cooling device being disposed above the radiator. A tank having an inlet for water injection and communicating with a radiator, and a pipe communicating between the tank and the uppermost part of the water passage in the engine body, wherein the pipe contains water in the engine body. In a cooling device provided with a hanging portion that is disposed at a position lower than the uppermost position of the allowable water level in the passage and the tank, in the middle of the pipe, a water passage in the engine body, the tank and the atmosphere. A cooling device comprising selective communication means for selectively communicating with the cooling device.