JPH09166022A - Engine cooler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce engine noises and to improve a cooling performance. SOLUTION: In a cooler provided with a radiator 32 having a cooling fan 5 for sucking cooling wind in an engine 1, an auxiliary cooling fan 5a rotated by an electric motor 5b is provided in the surface of the radiator 32 in a side opposite the side having the cooling fan 5 and this auxiliary cooling fan 5a is actuated when the temperature of cooling water or the temperature of equipment to be cooled exceeds a set value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine cooling device equipped with a radiator having a cooling fan.

[0002]

2. Description of the Related Art Conventionally, a cooling device for a water-cooled engine mounted on a work machine such as a power shovel or a tractor cools cooling water by a radiator having a cooling fan driven by the power of the engine, and the front face of the radiator. The equipment to be cooled such as a hydraulic oil cooling device (oil cooler) of a hydraulic device installed in the above and a condenser for an air conditioner are cooled by suction air from the cooling fan.

[0003]

The cooling device having the conventional structure as described above is set to cool by cooling one cooling fan at a high speed even when the engine is overheated and overloaded. Therefore, there is a drawback in that the wind noise of the cooling fan becomes a big noise because it is rotating at a high speed even in a work under a low load which is usually performed.

Further, in the case where the equipment to be cooled is provided on the front surface of the radiator, since the equipment to be cooled serves as an air intake path resistance of the radiator, the cooling fan must be rotated at a high speed correspondingly. There is.

[0005]

SUMMARY OF THE INVENTION An engine cooling apparatus of the present invention for solving the above-mentioned conventional problems is an engine 1
A radiator 3 having a cooling fan 5 for sucking cooling air into the radiator 3
In the cooling device equipped with 2, the motor 5b is provided on the radiator 32 surface opposite to the side where the cooling fan 5 is installed.
The auxiliary cooling fan 5a that is rotated by is provided, and is configured to be operated when the temperature of the cooling water or the equipment to be cooled exceeds a set value.

[0006]

Embodiments of the present invention will now be described with reference to the drawings. Reference numeral 1 denotes a diesel engine mounted on a power shovel A shown as an embodiment of a working machine, which is a cooling case 1a in which a known piston mechanism or the like is installed.
A cooling device 3 for cooling the cooling water in the cooling chamber 2 to a constant temperature is provided in front of the engine body 1c including the (cylinder block) and the crankcase 1b.

In the cooling device 3, a delivery passage 30 and a return passage 31 are provided on the upper and lower sides of the cooling chamber 2 so as to extend forward, and the passage 3
0 and 31 are connected by a radiator 32, and a bypass passage 4 that connects the attachment base side of these passages 30 and 31 is provided to circulate the cooling water in the cooling chamber 2 when the engine is operating. 5 is the radiator 32
Is a cooling fan that faces the back of the fan to blow air, and a passive pulley 51 that is belt-transmitted from the drive pulley 10 provided so as to project from the crankcase 1b on the fan shaft 50.
And a water supply pump 52 is attached to the end of the shaft. Then, by rotating the water supply pump 52 in the pump chamber 53 formed at the lower side base of the bypass passage 4 and the return passage 31, the cooling water is cooled from the upper portion of the cooling chamber 2 through the radiator 32 and the bypass passage 4. The chamber 2 is returned to the lower side.

Reference numeral 6 denotes a thermostat valve installed in the water supply passage 30 slightly above the position where the bypass passage 4 is attached. This thermostat valve 6 is similar to the conventional thermostat valve in that the cooling water is cooled to a set temperature as the engine operates. When it is sensed that the temperature rises to 1, the valve 6 is automatically opened to operate so that the high temperature water in the cooling chamber 2 is sent to the radiator 32 via the water supply passage 30. When the temperature is low, the valve 6 is closed to operate mainly for circulation from the bypass passage 4.

A sensor 7 for detecting a rise in the temperature of the cooling water is installed downstream of the thermostat valve 6, and when the sensor 7 detects the temperature of the cooling water above a set value, the harness 7a is installed. Auxiliary cooling fan 5 which will be described later
While rotating a, the operation of the engine 1 is automatically stopped by further increasing the temperature to prevent troubles such as seizure of the engine.

An air cooler 5c (shroud) surrounding the outer periphery of the radiator 32 of the cooling device 3 is provided, and an oil cooler for cooling the working oil of the hydraulic device in the vicinity of the radiator 32 is provided inside. 35
Also, the auxiliary cooling fan 5a rotated by the electric motor 5b is mounted with the condenser 36 for the air conditioner interposed.

The auxiliary cooling fan 5a is connected to a power source 5v through a controller 5d by the circuit shown in FIG. 2B, and the controller 5d is provided with the sensor 7 and the oil temperature sensor 35a of the oil cooler 35, and the controller 5d. An air conditioner switch 36a that operates by the operation of the air conditioner capacitor 36 is connected. As a result, when the cooling water and the hydraulic oil rise in temperature above a set value or when the air conditioner condenser 36 is operated, the electric motor 5b is operated via the controller 5d, the auxiliary cooling fan 5a is rotated, and the oil is cooled. The air is blown to the cooler 35 and the radiator 32 so that they are satisfactorily cooled together with the suction air of the cooling fan 5.

The cooling device 3 constructed as described above operates the auxiliary cooling fan 5a when the cooling water temperature rises abnormally when the engine 1 is overloaded, or when the oil cooler 35 and the condenser 36 are cooled. As a result, cooling assistance can be accurately performed on the front side of the radiator 32.
Therefore, the cooling water during the normal operation in the low load region can be satisfactorily cooled by rotating the cooling fan 5 in a state where the rotation of the cooling fan 5 is set to a relatively low speed. It is possible to reduce noise and the like, and it is possible to smoothly perform comfortable work while cooling the engine 1 satisfactorily in a state where the rotation speed of the cooling fan 5 that is constantly rotated is reduced.

Further, the auxiliary cooling fan 5a can be provided in a wide space portion of the radiator 32 on the side opposite to the cooling fan 5 with a sufficient installation space and a simple structure.
Next, a power shovel A which is an embodiment of a working machine equipped with the engine 1 will be described with reference to FIG. This power shovel A is provided with a bucket working unit 8b from the front on a machine base 8 having a crawler type traveling device 8a in which a crawler 82 is stretched between a driving wheel 80 and an idle wheel 81, and a driver seat behind the bucket working unit 8b. 8c and an engine portion 9 that houses the engine 1 are arranged.

A wheel tire 83 is detachably attached to the left and right drive wheels 80 and idler wheels 81 of the crawler type traveling device 8a through attachment flanges 80a and 81a on the drive and idler shafts. The machine base 8 can be swiftly moved. FIG.
As shown in (A) and (B), the exhaust pipe 91 of the engine 1 installed in the engine cover 90 of the engine unit 9 is
The end portion side is inserted into the lead-out pipe 92 so as to form a lead-out gap H, and an ejector effect is generated by the flow of the exhaust gas e that is vigorously discharged from the end portion, so that (A) The hot air h on the side of the engine 1 where the other end opening of the outlet pipe 92 shown in the figure is located is configured to be guided and discharged.

It should be noted that by disposing the opening of the lead-out pipe 92 at a portion outside the engine portion 9 where a high temperature atmosphere is likely to occur, heat radiation from this portion can be performed easily and satisfactorily. Further, as shown in FIG. 4, a bumper 85 also serving as a weight installed in the rear portion of the machine base 8 is rotatably supported on both sides of the machine base 8 by pivot shafts 8s in a divided state. The other side is connected to a hydraulic cylinder (reciprocating mechanism) 8b provided on the machine base 8. As a result, the left and right bumpers 85, 85 are swung by the extension of the hydraulic cylinder 8b from the dotted line bumper posture to the rearward spread posture shown by the solid line, and the front weight and the rear weight are smoothly and easily leveled. Since it is possible to balance the machine body at any time, good work can be performed stably.

[0016]

According to the invention of claim 1, the radiator 32 is provided.
Is provided on the other side of the normally rotating cooling fan 5 so that the auxiliary cooling fan 5a that is operated and rotated by a temperature rise higher than a set temperature is constantly rotated and cooled in a low rotation range suitable for normal operation. Therefore, it is possible to reduce noise caused by the cooling fan 5 and perform comfortable driving work.

The auxiliary cooling fan 5a is heated when the temperature rises above a set value during overloading or cooling of the equipment to be cooled.
Can be rotated to cool the engine 1 and the equipment to be cooled well.

[Brief description of the drawings]

FIG. 1 is a side view of a power shovel.

2A is a side sectional view of an engine cooling device, FIG.
(B) is a circuit diagram of an auxiliary cooling fan.

3A is a plan sectional view of an engine room, and FIG. 3B is a plan sectional view of an exhaust system.

FIG. 4 is a plan view showing a configuration of a weight section.

[Explanation of symbols]

 1 Engine 2 Cooling Chamber 3 Cooling Device 5 Cooling Fan 5a Auxiliary Cooling Fan 5b Motor 7 Sensor 32 Radiator 35 Oil Cooler 36 Condenser A Power Shovel (Work Machine)

Claims (1)

[Claims] 1. A cooling device having a radiator 32 having a cooling fan 5 for sucking cooling air in an engine 1, wherein a motor 5b rotates a surface of a radiator 32 opposite to a side where the cooling fan 5 is installed. A cooling device for an engine, characterized in that an auxiliary cooling fan 5a is provided, and the auxiliary cooling fan 5a is configured to be operated when the temperature of the cooling water or the equipment to be cooled exceeds a set value.