JP2001295650A - Cooling device for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problems of low flexibility in the deign of coaxial in-line arrangement with an engine, a radiator and a cooling fan. SOLUTION: In this cooling device, the engine 10 and the cooling fan 18 are arranged in an in-line state, while the radiator 19 is installed on a face part which is crosswise to the in-line arrangement.

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, and is used for an engine of a construction machine such as a tractor engine and a backhoe.

[0002]

2. Description of the Related Art As described on page 270 of a biological production machine handbook (edited by the Japan Society of Agricultural Machinery, published by Corona Co., Ltd.), "The tractor engine is water-cooled for heavy-load operation, low-speed operation, and stationary operation. The cooling water pump is a centrifugal impeller and is provided coaxially with the cooling fan, sucks cooling water from the lower part of the radiator (radiator), pressurizes it, and pressurizes the crankcase and cylinder head. Into the water jacket inside.
When the temperature of the water cooled in the combustion chamber or the like is 82 ° C. or higher, the water returns to the radiator from above through a thermostat provided at the tip of the water manifold. The radiator radiator uses louverless corrugated fins that are less clogged by dust and insects. A pressure type is used for the radiator cap. 4, the engine 1 is surrounded by a hood (engine cover) 3 that defines an engine room 2, and a cooling fan 4 is provided in front of the engine 1 via a winding transmission 5. A radiator 6 is provided in front of the cooling fan 4.

In the conventional example shown in FIG. 4, when the cooling fan 4 is driven, outside air (air) is sucked in from the front grill portion 3A of the bonnet as shown by arrow A and heat is exchanged by the core (radiator plate) of the radiator 6. And a cooling device of a type that flows down into the engine room 2 as shown by arrow A-1 (hereinafter referred to as a suction-type cooling device). Alternatively, a cooling device of the type in which the air in the engine room 2 flows as indicated by arrow B by driving the cooling fan 4 to perform heat exchange with the core of the radiator 6 and discharge as indicated by arrow B-1 (hereinafter referred to as B-1) , A discharge type cooling device).

[0004]

SUMMARY OF THE INVENTION A suction cooling device is
There is a problem that heat is easily stored in the engine room 2 and an operator (driver or the like) is exposed to a hot environment. On the other hand, the discharge-type cooling device has a problem that the exhaust noise is a noise factor. Furthermore, in both models, the radiator, cooling fan, and engine are coaxially arranged (on the common axis) in series, so there is no freedom in designing the cooling system, and the design is uniform. There were challenges.

Also, since the radiator and the cooling fan are arranged in series and are close to each other, the two are relatively displaced by vibration (vibration caused by driving the engine, vibration during running (including work), etc.) or bending of the fan shaft. There is a possibility that they may interfere with each other, and if there is such interference, one or both of them may be damaged or cannot be driven, and the frequency of maintenance (correction work or the like) increases. An object of the present invention is to provide a cooling device for an internal combustion engine that has solved the above-mentioned problems.

[0006]

The present invention comprises an engine (10) housed in an engine room (13), a radiator (19) and a cooling fan (18),
The engine (10) is driven by the driving of the cooling fan (18).
In order to achieve the above-mentioned object, the following technical measures are taken in a cooling device for an internal combustion engine configured to cool the engine. That is, the cooling device for an internal combustion engine according to claim 1 includes an air intake port (12A) in an engine cover body (12) that defines an engine room (13), and is provided side by side with the engine cover body (12). A shroud (14) is provided, and a communication path (15) for communicating the inside of the shroud (14) with the engine room (13) is provided, and the cooling fan is provided in an exhaust port (17) formed in the shroud (14). (18) is arranged to be driven around the horizontal axis,
The radiator (19) is disposed on a surface of the shroud (14) intersecting with the axis of the cooling fan (18),
The air intake (12) is driven by driving the cooling fan (18).
Air flows into the engine room (13) from A) and is introduced into the shroud (14) through the communication passage (15).
The radiator flow passing through the radiator (19) is introduced into the shroud (14), and the two systems of introduced air are discharged from the air outlet (17).

[0007] With this configuration, by driving the cooling fan (18), outside air enters the engine room (13) from the air inlet (12A) formed in the engine cover (12). The engine (10) is introduced as shown by arrow C and flows down in the engine room (13).
Is air-cooled and introduced into the shroud (14) through the communication path (15) as shown by arrow D. On the other hand, in the radiator (19), outside air is introduced into the shroud (14) and heat-exchanged as shown by an arrow E, sent to a water jacket or the like of the engine (10), and cooled by water.
On the other hand, the introduced air (mixed airflow) of the two systems is supplied to the exhaust port (1).
It is discharged as indicated by arrow F from 7).

The radiator (19) is provided with a cooling fan (1).
The shroud (14) is disposed on the surface of the shroud (14) that intersects (intersects) with the axis of 8). Therefore, the upper portion (ceiling surface), the side portion (left or right surface portion) or the lower portion (bottom surface) of the shroud (14). Etc., and the degree of freedom of design is expanded.
In a tractor, a backhoe or the like, it can be disposed at the best position according to equipment such as a driver's seat, tanks such as a fuel tank, a battery, and a control valve. An engine (10) and a cooling fan (18) according to claim 1 above.
It is recommended that they are opposed to each other via a shroud (14).

As described above, since the engine (10), the cooling fan (18) and the radiator (19) are not arranged in series on the common axis, mutual interference between the cooling fan (18) and the radiator (19) is achieved. Is eliminated, and the cause of failure and the frequency of maintenance can be reduced. In the above-mentioned claim 1 or 2, it is recommended that a cylindrical portion (20) surrounding the exhaust air flow extends in the exhaust air direction in the exhaust air outlet (17) (claim 3). As a result, noise can be suppressed even in a discharge type.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a cooling device for an internal combustion engine according to the present invention will be described below with reference to the drawings. In FIG. 1, an engine 10 is mounted (mounted) on a base 11 and housed in an engine room 13 defined by an engine cover 12. The base 11
Is a vehicle body or a front axle frame for agricultural traveling vehicles such as tractors, riding rice transplanters, combiners, and the like; and for a turning type work vehicle (construction machine) such as a backhoe or a crane vehicle, the vehicle rotates around the vertical axis. And the like.

Although it is recommended that the engine 10 be mounted on the base 11 via an elastic support such as a rubber mount, the support means (connecting means) may be a fastening means such as a bolt. good. The engine cover body 12 that defines the engine room 13 is made of a sheet metal or a resin plate (including a reinforcing fiber), and has an air intake port 12A for taking in outside air into the engine room 13. Reference numeral 12 denotes a structure that is detachable from the base 11 or that a fixed cover is partially fixed to the base 11 and a movable cover that can be opened and closed with a hinge or the like with respect to the fixed cover. Therefore, it is desirable to consider the maintainability.

It is desirable to attach a dust collector such as a louver or a mesh to the air inlet 12A, but it is not necessary to attach the dust collector. When this collector is mounted, it is desirable to use a rotating type and a sliding type.
A shroud (a box body having an air guide passage) 14 is provided in parallel with the engine cover body 12.
4A and the engine room 13
A communication path 15 is formed in either the shroud or the engine cover body (the wall plate 16 that partitions them).

The shroud 14 is made of the same material (same quality) as the engine cover body 12 described above.
The dust collector attached to the above-mentioned intake 12A can be attached to the communication path 15 (it may not be attached). The shroud 14 has a circular exhaust port 17 formed therein, and the exhaust port 17 has a discharge-type cooling fan 18.
Is decorated. The cooling fan 18 is
A is disposed so as to be driven by the engine 10 around the horizontal axis, and a radiator 19 is disposed on a surface of the shroud 14 intersecting with the axis of the cooling fan 18.
In the first embodiment shown in FIG. 1, a radiator 19 is provided on the ceiling surface of the shroud 14.

When the cooling fan 18 is driven to rotate, outside air is introduced from the air inlet 12A into the engine room 13 as indicated by reference numeral C, cools the engine 10 by air, and transmits the air through the communication passage 15. As shown by D, the air reaches the air guide path 14A. On the other hand, as shown by the reference numeral E, the outside air flows to the radiator 19 as a core (radiator) of the radiator 19.
, Heat is exchanged, and is discharged through the exhaust port 17 as shown by the symbol F. As shown in FIG. 1, the engine 10 and the cooling fan 18 are arranged to face each other via the shroud 14, and the exhaust port 17 has a cylindrical portion 20 surrounding the exhaust air flow F extending in the exhaust air direction. ,
Even when the cooling fan 18 is provided inside the shroud 14 and is of a discharge type, noise, vibration noise, and the like due to fan driving are blocked by the cylindrical portion 20.

FIG. 2 shows a second embodiment of the present invention, and the location of the radiator 19 is different from that of FIG.
That is, in FIG. 2, the radiator 19 is mounted on the right side surface of the shroud 14 in the drawing. As described above, the mounting portion of the radiator 19 is arbitrary, and the degree of freedom of design is improved here. Therefore, the radiator 19 can be mounted on the left side surface, the bottom surface, and the like.

The air inlet 12A and the communication passage 15 may be formed one by one, but one may be formed as one and the other as a plurality, or both may be formed as a plurality. The cooling fan 18 may be driven by an engine power via a winding transmission or may be directly driven by a fan motor. FIG. 3 shows another disclosed technique, in which dust or the like adheres to the front surface of the radiator 19 (insect screen or the like) and is removed. That is, a discharge type fan 21 that is driven to rotate by an electric motor or the like is attached to the rear of the radiator 19, and this fan 21 is not normally driven to rotate, but is used when the engine cover body 12 is opened to perform maintenance or the like. By detecting the open state with a switch or the like and activating the electric motor, the fan 21 is driven to remove dust and the like adhering to the front surface of the radiator 19 as indicated by reference numeral G.

That is, during normal operation, the fan 21 is stopped, the heat is exchanged by the radiator 19 by the driving of the cooling fan 18, and the heat is passed through the engine room 13 and discharged to the outside. When servicing the engine 10 and the like, the engine 10 is idled for a predetermined time, and the fan 21 is driven for a predetermined time by this signal to remove dust adhering to the radiator 19, and to maintain the cover body 12 for maintenance. Therefore, even when the fan 21 is opened, the fan 21 is driven.

The technique disclosed in FIG. 3 can be applied to the present invention.

[0019]

According to the present invention, the problem that the arrangement positions of the engine, the radiator and the cooling fan are uniform and the degree of freedom of design is small can be solved at once.

[Brief description of the drawings]

FIG. 1 is a side view showing a first embodiment of the present invention.

FIG. 2 is a front view showing a second embodiment of the present invention.

FIG. 3 is a side view showing another disclosed technology.

FIG. 4 is a side view of a conventional example.

[Explanation of symbols]

 Reference Signs List 10 engine 12 engine cover body 12A air intake 13 engine room 14 shroud 15 communication passage 17 exhaust port 18 cooling fan 19 radiator

Claims (3)

[Claims] An engine (10) housed in an engine room (13), a radiator (19) and a cooling fan (18) are provided, and the engine (10) is driven by the cooling fan (18). In a cooling device for an internal combustion engine configured to cool, an engine cover (12) defining an engine room (13) is provided with an air intake (12A), and is provided side by side with the engine cover (12). A shroud (14) is provided, a communication passage (15) for communicating the inside of the shroud (14) with the engine room (13) is provided, and the cooling fan (17) is formed in an exhaust port (17) formed in the shroud (14). 18) to be driven around the horizontal axis,
The radiator (19) is disposed on a surface of the shroud (14) intersecting with the axis of the cooling fan (18),
The air intake (12) is driven by driving the cooling fan (18).
Air flows into the engine room (13) from A) and is introduced into the shroud (14) through the communication passage (15).
And a radiator flow that has passed through the radiator (19) is introduced into the shroud (14), and the two systems of introduced air are discharged from the exhaust port (17). . 2. An engine (10) and a cooling fan (18).
2. The cooling device for an internal combustion engine according to claim 1, wherein the cooling device and the cooling device are opposed to each other via a shroud (14). 3. 3. The exhaust port (17) provided with a cooling fan (18) has a cylindrical portion (20) surrounding the exhaust air flow extending in the exhaust air direction. Or 2
3. The cooling device for an internal combustion engine according to claim 1.