JPH06115364A - Engine cooling construction of working truck - Google Patents

Abstract

PURPOSE:To offer the engine cooling construction of a working truck capable of allowing high temperature air apt to be filled in an engine room to escape smoothly. CONSTITUTION:A centrifugal fan 5 to inhale cooling air into an engine cooling radiator 4 is provided, between an engine and the radiator 4 arranged inside an engine room 2 in such a manner that its rotating disc 6 may face the radiator 4, and a fan shroud 9 is provided to guide the wind generated by the centrifugal fan 5 so as to blow it toward exhaust outlets 11a, 11b, on lateral walls 1A, 1B in the engine room 2. An air blasting guide 12 to guide the wind blown out from the fan shroud 9 to the exhaust outlets 11a, 11b is extended into the engine room 2 through the upper part of the exhaust outlets 11a, 11b on the lateral walls 1A, 1B and, in addition, a gap 13 is provided for wind flow on the upper end of exhaust blowoff ports 10a, 10b formed on the wind blasting guide 12 and the fan shroud 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a centrifugal fan for sucking cooling air into the radiator between an engine arranged in an engine room and an engine cooling radiator, the rotary disk of which is a rotary disk. The present invention relates to an engine cooling structure for a work vehicle, which is provided so as to face a radiator and is provided with a fan shroud for guiding the wind generated by the centrifugal fan so as to be blown out toward an exhaust port on a lateral side wall of the engine room.

[0002]

2. Description of the Related Art Conventionally, in an engine cooling structure for a work vehicle such as an agricultural tractor, an exhaust port of a fan shroud and an exhaust port on a side wall of an engine room are connected to each other. The air in the engine room is guided to the fan shroud together with the air introduced from the front of the engine room, and is discharged to the outside by the centrifugal fan.

[0003]

Therefore, in the above-described conventional structure, the air having a high temperature around the engine in the engine room does not reach the outside by the centrifugal fan until the radiator flows. Since it was designed to be discharged, the high temperature air does not flow smoothly because it has to bypass the fan shroud, etc. Therefore, the high temperature air is apt to stay in the engine room. However, there has been a demand for a more effective means for escaping the hot air to the outside. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an engine cooling structure for a work vehicle capable of smoothly releasing high-temperature air, which tends to stay in the engine room, to the outside.

[0004]

In order to achieve the above object, an engine cooling structure for a work vehicle according to the present invention is provided with the radiator between an engine and an engine cooling radiator arranged in an engine room. A centrifugal fan for sucking cooling air is provided in the state that its rotating disk faces the radiator, and the air blown by the centrifugal fan is blown out toward the exhaust port on the side wall of the engine room. A fan shroud that guides the fan shroud is provided, and a blower guide that guides the blown air from the fan shroud to the exhaust port extends into the engine room from a position above the exhaust port of the lateral side wall, and An air flow gap is provided between the guide and the upper end of the exhaust air outlet formed in the fan shroud. . The operation and effect of this characteristic configuration are as follows.

[0005]

That is, since there is a gap for air flow between the blower guide and the upper end of the exhaust air outlet formed in the fan shroud, the air blown by the centrifugal fan is discharged from the fan shroud. Due to the ejection effect when the air is blown from the engine room toward the exhaust port on the side wall of the engine room, the air above the engine room is drawn into the exhaust path through the gap without being obstructed by the fan shroud, etc. Will be discharged to.

[0006]

Therefore, particularly in the engine room, high temperature air around the engine, which is apt to stagnate in the upper portion, is provided with a gap between the guide provided above the air outlet and the upper end of the air outlet of the fan shroud. Since it can be smoothly discharged to the outside by the simple structure provided, the temperature in the engine room can be kept relatively low, and the cooling performance for the engine can be improved.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 5 shows an agricultural tractor as an example of the work vehicle. In this agricultural tractor, a water-cooled engine 3 is provided in an engine room 2 inside a bonnet 1 provided at the front of the tractor with the crankshaft facing forward and backward, and an engine cooling radiator 4 is located in front of the engine 3. The centrifugal fan 5 for sucking the cooling air into the radiator 4 is provided between the engine 3 and the radiator 4 with its rotating disk 6 facing the radiator 4. A large number of fins 7 for wind generation are juxtaposed on the rotating disk in a protruding state toward the radiator 4, and the engine 3 and the centrifugal fan 5 are linked by a fan belt 8.

As shown in FIGS. 1, 2 and 4, the centrifugal fan 5 is surrounded by a fan shroud 9, and an air intake port is formed at a portion of the fan shroud 9 facing the radiator 4. , Fan shroud 9
An air passage 10 for sending the airflow generated by the centrifugal fan 5 to the outside of the hood 1 on both sides in the left-right direction of the
A and 10B are formed. Left and right side walls 1 of bonnet 1
An exhaust port 11 with a grill for discharging cooling air is provided in A and 1B.
a and 11b are provided corresponding to the air passages 10A and 10B, respectively. Then, the cylindrical blower guide 1 is directed toward the inside of the engine room 2 so as to surround the exhaust ports 11a and 11b.
2 and 12 are provided in a protruding manner, and exhaust air outlets 10a and 10b for ejecting exhaust air toward the exhaust air outlets 11a and 11b at both left and right ends of the fan shroud 9 are provided with the air guides 12 and 1.
Blower guide 12,12
And the fan shroud 9 are provided with air gap guides 12, 12.

With the above-described structure, as shown in FIG. 2, the centrifugal fan 5 blows air so that the air flows in the centrifugal direction, and the blown air flow is guided by the fan shroud 9 and the air passages 10A, 10B. By being discharged to the outside of the bonnet 1 through the hood 1, cooling air is introduced into the bonnet 1 from the front of the bonnet 1 so as to cool the radiator 4, and the cooling air that has cooled the radiator 4 is also introduced. It will be introduced into the fan shroud 9. At this time, the exhaust air outlets 10a, 1 of the fan shroud 9
The air in the engine room 2 is sucked into the air guides 12 and 12 through the gap 13 due to the ejection effect that the air pressure in the air guides 12 and 12 is lowered from the inside of the engine room 2 by the exhaust air blown from 0b.
The exhaust air from the fan shroud 9 is sent to the outside of the bonnet 1. In particular, the upper portions of the blower guides 12, 12 and the exhaust air outlets 10a, 10b of the fan shroud 9
Since the upper side of the engine room 2 is located between the upper end of the engine room 2 and the upper end of the engine room 2, it becomes easy to discharge the air, which becomes hot and tends to stay above the engine room 2, through the gap 13.

Next, the drive structure of the centrifugal fan 5 will be briefly described. As shown in FIGS. 1 and 3, the engine 3
A pair of drive pulleys are continuously provided on the crankshaft of, and a drive pulley of the drive pulleys, which is close to the engine 3,
The belt 17 for driving the water pump extends over the driven pulley 16 connected to the drive shaft 15 of the water pump 14.
The fan belt 8 is stretched over a drive pulley farther from the engine 3 and a fan driven pulley 18 integrally connected to the rotating disk 6 of the centrifugal fan 5. Then, the driven pulley 18 for the fan
Is connected to and supported by the driven pulley 16 via a bearing 20 and a support bracket 21 in a state in which the rotation axis P thereof matches the rotation axis of the drive shaft 15. Further, the driven pulley 16 and the fan driven pulley 18 are set to have appropriate belt winding diameters so that the water pump 14 and the centrifugal fan 5 are driven at predetermined rotational speeds. In the figure, reference numeral 22 is a tension pulley.

It should be noted that reference numerals are given in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configuration of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view showing an engine cooling structure.

FIG. 2 is a vertical sectional front view showing an engine cooling structure.

FIG. 3 is a vertical sectional side view showing a transmission structure for a centrifugal fan and a water pump.

FIG. 4 is a perspective view showing a fan shroud.

FIG. 5 is an overall side view showing an agricultural tractor.

[Explanation of symbols]

 1A, 1B Side wall 2 Engine room 3 Engine 4 Engine cooling radiator 5 Centrifugal fan 6 Rotating disc 9 Fan shroud 10a, 10b Exhaust air outlet 11a, 11b Exhaust outlet 12 Air guide 13 Gaps

Claims (1)

[Claims] 1. A centrifugal fan for sucking cooling air into the radiator (4) between an engine (3) and an engine cooling radiator (4) arranged in an engine room (2). 5) is provided with its rotating disk (6) facing the radiator (4), and the air blown by the centrifugal fan (5) is applied to the side wall (1A) of the engine room (2). , (1B) exhaust port (11
a) a fan shroud (9) for guiding the air to blow out toward (a), (11b), and blown air from the fan shroud (9) is exhausted through the exhaust ports (11a), (1).
The blower guide (12) for guiding to 1b) is provided with the exhaust ports (11a), (11) of the lateral side walls (1A), (1B).
Exhaust air outlets (10a), (1) extending from above the b) into the engine room (2) and formed in the air blow guide (12) and the fan shroud (9).
0b) is an engine cooling structure for a work vehicle in which a gap (13) for air flow is provided between the upper end and the upper end.