JPS6341542Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cooling air intake device formed in an engine enclosure, and more particularly to a cooling air intake device for an engine that can reduce engine noise.

Conventionally, an enclosing device for an engine of an earthmoving vehicle or a construction machine, etc., has been formed by, for example, a hood 2, a side guard 4, a dart board 6, a radiator guard 8, a radiator grill 10, an under guard 12, etc., as shown in FIG. is common. The engine has a cooling system in which air is sucked in through openings in the hood or side guards and is discharged to the front of the vehicle using a cooling fan. However, this causes engine noise and other mechanical noise to be dissipated through the air intake openings of the hood or side guard, creating problems in terms of noise control.

The present invention has been made to eliminate the above-mentioned conventional drawbacks, and for this reason, the present invention provides a cooling air intake system for an engine in which the hood has a double structure consisting of an outer plate and an inner plate over almost the entire surface of the engine hood. An intake duct is formed therebetween, and one end of the intake duct is closed, and outside air intake ports are provided near the one end on both sides of the upper surface of the hood, and the other end of the duct is closed over almost the entire width of the hood. The duct is opened into the engine room, sound-absorbing material is placed over almost the entire inner or outer surface of the duct, cooling air is sucked in by the air blown by the radiator cooling fan, and the sucked cooling air flows into the engine room from the bottom of the engine room. It is characterized in that it is mixed with a portion of the cooling air that is recirculated into the engine room.

The content of the present invention will be explained below with reference to embodiments shown in the accompanying drawings.

Figures 2 and 3 show the case where the present invention is applied to an engine enclosure device for an earthmoving vehicle. In the figures, 1 is an engine, 3 is a cooling fan, 5 is a radiator core, 2 is a hood, and 4 is a side guard,
6 is the dash board, 8 is the radiator guard, 1
2 is under guard, 14 is radiator guard 8
16 indicates a silencer device assembled to the radiator guard 8 in front of the silencing louver device 14.

As shown in the figure, the hood 2 has an outer plate 18 and an inner plate 2 over almost the entire surface of the hood.
It has a double structure with 0 and an intake duct 22 between it.
It is said that The front end of the duct 22 is closed by a plate 24, and the rear end is an opening 28 communicating with the engine room 26 over almost the entire width of the hood. Near the front end of the duct 22, the left and right corners of the hood 2, that is, both upper and side surfaces, are formed of punching metal 30, and the punching metal is connected to the duct 2 from outside the vehicle.
A suction port 32 for sucking cooling air is formed in the inside of the air conditioner 2 . A sound absorbing material 34 is stretched over almost the entire inner and outer surfaces of the duct 22.

The silencing louver device 14 includes a plurality of horizontal louvers 36, and these louvers 36 are attached to a fixed frame (not shown), and the fixed frame is detachably attached to the opening 9 of the radiator guard 8. As shown in FIG. 4, each horizontal louver is formed by surrounding a sound absorbing material 38 with a punching metal 40 having a sufficient aperture ratio.
installed at an angle to the flow of noisy air discharged by the Furthermore, as shown in FIG. 2, the louvers 36 have different cross-sectional shapes; the horizontal louver 36a directs noise air upward, the horizontal louver 36b directs noise air downward, and the wedge-shaped horizontal louver 36c directs noise air downward. Its shape allows some of the noisy air to be exhausted upwards and the rest downwards. The spacing and number of louvers are such that the amount of ventilation is sufficient to prevent the engine from overheating.
In addition, it is determined for each vehicle so that a sufficient sound absorption effect can be achieved.

The radiator silencer device 16 is installed slightly separated from the louver device 14 so as to form a space 42 between the radiator silencer device 16 and the louver device 14. The radiator silencer device 16 has a width that is almost the same as the width of the radiator guard 8 so as to cover almost the entire surface of the radiator guard 8, its upper end extends to the same height as the hood 2, and its lower end extends to the under guard 12. It is smoothly combined with the sloping bottom surface of the The radiator silencer device is composed of an outer substantially planar plate 44 and a sound absorbing material 46 stretched over the entire inner surface of the plate 44. A plurality (1 to 3) of vertical partition plates 48 are installed to divide the space 42 formed by the device 16, the radiator guard 8, and the silencing louver device 14 into several rooms to enhance the silencing effect. It is detachably attached to the outer plate 44. The partition plate 48 is formed by surrounding a sound absorbing material with punched metal having a sufficient aperture ratio. The upper end of the space 42 formed by the present device 16 is an opening 50 through which noisy air is discharged to the outside of the vehicle. is covered by. The space section 4
The lower end of 2 is smoothly connected to the under guard 12 in order to guide a part of the noise air to the guide path 54 formed by the under guard 12 having a double structure.

The under guard 12 has a double structure with an inner plate 56 and an outer plate 58 to form a guideway 54, and an entrance 60 of the guideway 54 is connected to the lower end of the upper space 42, and an outlet 62 is connected to the lower end of the upper space 42. It opens into the engine room 26. A sound absorbing material may be provided on the inner and outer surfaces of the guideway 54 to enhance the sound absorbing effect.

In the figure, 64 indicates a radiator tank, 66 indicates a hydraulic tank, 68 indicates an opening for an air cleaner, and 70 indicates an opening for a muffler.

Next, to describe the operation of the above-mentioned embodiment, cooling air is supplied from outside the vehicle to the duct 22 through the cooling air intake port 32 of the hood 2 due to the blowing action of the cooling fan 3.
through the duct 22 and into the opening 28.
It is sucked into the engine room 26. In this case, since the cooling air intake ports 32 are provided on both sides of the upper surface of the hood 2, a large intake area can be obtained, and since the opening 28 extends over almost the entire width of the hood 2, the intake area can be increased. The resistance is small and it is easy to take in a sufficient amount of cooling air. Since the opening 28 is separated from the cooling air intake port 32 by the duct 22 covered with a sound absorbing material 34,
The noise in the engine room 26 is absorbed and reduced by the sound absorbing material 34 while being radiated outside the vehicle through the duct 22. Since the sound absorbing material extends over almost the entire surface of the duct 22, a large sound absorbing area can be obtained and a good sound absorbing effect can be obtained. In addition, by providing sound absorbing material on the inner and outer surfaces of the duct 22 in this way, it is possible to reduce the reverberation of noise on the iron plate surface, and it is also possible to prevent the generation of chatter noise due to the vibration of the plates 18 and 20. can.

Cooling air sucked into the engine room 26 through the opening 28 passes around the engine 1 and is discharged to the radiator core 5 by the cooling fan 3. Since the gap between the radiator core 5 and the exhaust gas 72 and 74 is closed, most of the noisy air discharged by the cooling fan 3 flows through the radiator core 5.
and is guided to the silencing louver device 14.

The silencing louver device 14 has a sound absorbing effect on the noisy air discharged by the cooling fan 3, but as described above, since each louver 36 is angled with respect to the flow of the noisy air, a good sound absorbing effect cannot be obtained. Moreover, since the cross-sectional shapes of each louver 36 are different, the noise air is dispersed vertically.

Noise air that has passed through the silencing louver device 14 is guided to a radiator silencer device 16 in front of the louver device 14. The radiator silencer device 1
6 uses a sound-absorbing material 46 to muffle the noisy air and at the same time guide the noisy air along the space 42, discharge a part of it to the outside of the vehicle from the upper opening 50, and the rest to the guideway 54 from the lower end entrance 60. lead. At this time, the sound absorbing material 46 prevents the plate 44 from chattering noise caused by collision of noisy air or vibration of the vehicle body.

The noise air guided into the guideway 54 from the space 42 is introduced into the engine room 26 from the outlet 62 through the guideway 54, where it is combined with the cooling air taken in from the cooling air intake port 32 of the hood 2. Mix again from the cooling fan 3 to the radiator core 5,
It is circulated through the silencing louver device 14 and the radiator silencer device 16. As a result, part of the noise air discharged from the radiator silencer device 16 to the outside of the vehicle is routed through the guideway 54 and returned to the engine room 26.
It is possible to reduce the noise that is recirculated inside the vehicle and emitted to the outside of the vehicle. Also, at this time, the cooling air flowing in from the opening 28 above the engine room 26 and the air recirculated from the lower part of the engine room mix well, so that the entire engine room can be evenly and efficiently cooled. Further, since the under guard 12 has a double structure, there is an advantage that noise in the engine compartment is not easily transmitted to the outside of the vehicle.

FIG. 5 shows a modification of the present invention, in which the rear end of the duct 22 is closed by a plate 24', and an engine room 2 is provided in the front part of the duct 22.
6, and a cooling air intake port 32' is provided at the rear of the hood 22, but this modified example also has the same effect as the previous example. Obtainable.

As described above, according to the present invention, the engine hood has a double structure to form a duct, one end of the duct is closed, an outside air intake port is provided in the hood near the one end, and the other end of the duct is closed. Since the duct is opened to the engine room and the duct is covered with sound absorbing material, it is possible to minimize noise emission from the engine cooling air intake to the outside of the engine enclosure.

Moreover, the duct is constructed by forming a double structure with an outer plate and an inner plate over almost the entire surface of the engine hood, and the above-mentioned outside air inlet is provided on both sides of the upper surface of the hood and on both sides. Since the opening is opened into the engine room over almost the entire width of the hood, not only is the intake resistance low and cooling air can be easily introduced into the engine room, but also the cooling air can be drawn in from above the engine room through the opening. The cooling air is well mixed with the air recirculated into the engine room from the lower part of the engine room, and the cooling air can be efficiently applied to the entire engine for effective cooling. Furthermore, the structure of the duct is simple, and since the cooling air is sucked in by the blowing action of the radiator cooling fan, there is no need to provide a dedicated fan for sucking the cooling air, simplifying the overall structure. be able to.

The device of this invention is applicable to engines other than earthmoving vehicles.
For example, it can be applied to an enclosing device for the engine of a construction machine. Furthermore, the present invention is also applicable to engine enclosure devices of general structure that do not have special structures such as the radiator silencer device and the double-layered underguard shown here.

[Brief explanation of the drawing]

Fig. 1 is a side view of an earthmoving vehicle equipped with a conventional engine enclosure device, Fig. 2 is a side view of the internal structure of an embodiment of the engine enclosure device equipped with a cooling air intake device according to the present invention, and Fig. 3 2 is a partially omitted and partially sectional plan view of the device shown in FIG. 2, FIG. 4 is a sectional view of a louver, and FIG. 5 is a side partial sectional view showing a modification of the device of the present invention. 1... Engine, 2... Hood, 3... Cooling fan, 4... Side guard, 5... Radiator core, 8... Radiator guard, 12... Under guard, 14... Sound deadening louver device, 16... Radiator silencer device, 22... duct, 26...
...engine room, 28...opening, 32...intake port, 34...sound absorbing material, 36a, 36b, 36c...
... Louver, 42 ... Space, 44 ... Plate, 46 ... Sound absorbing material, 50 ... Opening, 54 ... Taxiway, 56, 58 ... Plate, 60 ... Entrance,
62...Exit.

Claims (1)

[Claims for Utility Model Registration] (1) In a cooling air intake device for an engine, the hood has a double structure with an outer plate and an inner plate over almost the entire surface of the engine hood, and an intake duct is formed therebetween. One end of the duct is closed, and outside air inlets are provided near the one end on both sides of the upper surface of the hood, and the other end of the duct is opened to the engine room over almost the entire width of the hood. Sound-absorbing material is placed over almost the entire interior or exterior surface,
An engine characterized in that cooling air is sucked in by air blown by a radiator cooling fan, and the sucked cooling air is mixed with a portion of the cooling air that is recirculated from the lower part of the engine room into the engine room. cooling air intake device. (2) The device according to item 1, wherein the outside air intake port is provided at the front or rear of the engine hood.