JPH0450431A - Air cooling type intake air cooling device of engine with superchrger for construction machine - Google Patents

Abstract

PURPOSE:To improve cooling efficiency and make a device small by providing an air cooling type intake air cooling device. while being opened the atmosphere in an air intake port part for cooling air of a radiator. CONSTITUTION:Cooling air flows into a sealed engine room 3 from a cooling air intake port 2a provided on a bonnet 2 via an air cooling type intake air cooling device 5. The efficinecy of the air cooling intake air cooling device 5 is improved, and since the cooling air in a laminar flow condition is also aupplied to a radiator 4, the efficiency of the radiator 4 is also improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an air-cooled charge air cooling device for a supercharged engine for construction machinery.

(Prior Art) A conventional air-cooled charge air cooling device housed in a closed engine room of a supercharged engine for construction machinery will be described with reference to FIG.

FIG. 2 shows an embodiment using a wheeled Shiroper dozer, in which an engine 1 is installed in an engine room 13 inside a bonnet 12 at the rear of the vehicle, and a push-out cooling fan 1a is installed in front of the engine 1. Push-out cooling fan 1
In front of a is an air-cooled supply air cooler 15 and a radiator 4.
are arranged side by side.

The engine room 13 is covered with a bonnet 12 equipped with a cooling air intake port 2a on the top surface, and the cooling air A generated by the extrusion type cooling fan 1a installed at the front of the engine 1 flows into the bonnet 12. The engine 1 enters the engine housing chamber 13 through the provided cooling air intake 12a.
Air-cooled supply air is cooled by the extruded cooling fan 1a! 15 and the radiator 4, and at this time, it exchanges heat with the intake air and cooling water and is discharged to the atmosphere.

On the other hand, the intake air of the engine 1 is introduced from a pre-cleaner 6 installed outside the engine room 13, enters the compressor chamber of the supercharger 8 via the air cleaner 7, is pressurized and heated, and is cooled by air-cooled charge air cooling. After passing through the container 15 and exchanging heat with the cooling air A, the air is supplied to the intake manifold 1b of the engine 1.

(Problems to be Solved by the Invention) Intake air in a supercharged engine is pressurized by a supercharger and raised in temperature, but it is necessary to reduce the intake air temperature in order to improve engine output and prevent exhaust emissions. As a countermeasure to this problem, intake air is cooled, but in the case of air cooling, according to the conventional technology, as shown in Figure 2, an air-cooled supply air cooler is installed in parallel immediately in front of the radiator, or in parallel immediately after the radiator. The method is adopted. In both of the above cases, air resistance increases because two coolers are stacked in series, reducing the efficiency of both the air-cooled supply air cooler and the radiator, and it is difficult to obtain the necessary cooling effect. It is necessary to increase the capacity of both the air-cooled supply air cooler and the radiator, which poses problems such as increased cost, increased weight, and increased size of the device.

The present invention focuses on the above-mentioned conventional problems and provides a method of arranging an air-cooled charge air cooler at an effective position to achieve the objective.

(Means for Solving the Problems) In order to achieve the above object, only the front opening of the radiator of a water-cooled engine equipped with a push-out cooling fan and the rear part of the cooling air intake of the radiator are opened to the atmosphere. In a supercharged engine for construction machinery installed in a closed engine room formed by It is something.

(Function) With the above configuration, cooling air flows into the sealed engine compartment from the cooling air intake provided on the bonnet via the air-cooled charge air cooler. The efficiency of the radiator is improved, and since laminar cooling air is also supplied to the radiator, the efficiency of the radiator is also improved.

(Example) An embodiment of the present invention will be explained with reference to FIG.

Fig. 1 shows an embodiment using a wheeled perdozer. In Fig. 1, the engine 1 is installed in a sealed engine room 3 within the bonnet 2 at the rear of the vehicle, and in front of the engine 1 is a push-out type cooling system. A fan 1a is installed, a radiator 4 is installed in front of the extrusion type cooling fan la,
It is opened to the atmosphere via the radiator 4.

Further, an air-cooled charge air cooler 5 is installed behind the engine 1 installed in the engine room 3, and a cooling air intake 2a is provided in the bonnet 7) 2 above the air-cooled charge air cooler 5. The engine room 3 is open to the atmosphere through the air-cooled intake air cooler 5.

Cooling air A is generated by the rotation of a push-out cooling fan 1a mounted in front of the engine 1, is introduced from a cooling air intake 2a provided in the bonnet 2, and passes through an air-cooled charge air cooler 5. It exchanges heat with the intake air and further heats the engine 1.
The water passes through the outer circumference of the cooling water, reaches the push-out cooling fan 1a, and then passes through the radiator 4, where it exchanges heat with the cooling water and is discharged into the atmosphere.

On the other hand, the intake air of the engine 1 is introduced from a pre-cleaner 6 installed outside the engine room 3, passes through an air-cooled charge air cooler 5 via an air cleaner 7, exchanges heat with cooling air, and then cools the engine. The air is supplied to the intake manifold 1b.

(Effect of the invention) With the above configuration, atmospheric air directly passes through the air-cooled supply air cooler, and since there is no air-cooled supply air cooler before and after the radiator unlike in the prior art, the cooling efficiency is improved. Therefore, it is possible to provide a cooling device that contributes to miniaturization of the device and cost reduction.

[Brief explanation of drawings]

FIG. 1 is a side view of a wheeled displacement perdozer equipped with a device according to the present invention, and FIG. 2 is a side view of a wheeled displacement perdozer equipped with a device according to the prior art. 1...Engine 1a...Extrusion type cooling fan 2...Bonnet 3...Engine compartment 4...Radiator 5... Air-cooled charge air cooler 6...Pre-cleaner 7...Air cleaner 8...Supercharger

Claims (1)

[Claims] A supercharger for construction machinery installed in a closed engine room formed by opening only the front opening of a radiator of a water-cooled engine equipped with an extrusion type cooling fan and the rear part of the cooling air intake of the radiator to the atmosphere. In the machine engine,
An air-cooled charge air cooling device for a supercharged engine for construction machinery, characterized in that an air-cooled charge air cooler is opened to the atmosphere at the cooling air intake portion of the radiator.