JPS6035543B2 - engine enclosure device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an engine enclosure device, and more particularly to an engine enclosure device capable of reducing engine noise.

The enclosing device for the engine of the follower, earthmoving wheel, construction machine, etc.
For example, as shown in Fig. 1, a hood 2, a side guard 4,
It is generally formed by a dashboard 6, a radiator guard 8, a radiator bulge 10, an under guard 12, and the like.

The engine has a cooling system in which the air sucked in through the openings of the hood or side guards is discharged in front of the wheels and the like using a cooling fan. However, because of this, engine noise and other mechanical noises are radiated from the air intake port of the hood or side guard, or are discharged together with the exhaust air from the front port of a vehicle, etc. Completely enclosing the front, sides, and top of the engine compartment virtually eliminates these noises, but sealing the engine compartment in this way restricts the engine cooling system and can cause overheating. . Therefore, several methods have been proposed to obtain suitable noise attenuation characteristics at the same time without impairing the cooling characteristics of the engine. These methods include, for example, installing sound absorbing material on the inside of the hood, side guards, and under guards, or using a radiator mask or radiator siren to guide and discharge noisy air discharged by a cooling fan in front of the radiator guard to above the wheels, etc. These methods include installing a special air flow passage in the engine room and using sound absorbing material stretched inside the passage to absorb sound. However, the conventional method described above cannot effectively prevent the emission of engine noise from the cooling air intake opening, and the noise attenuation of the exhaust air cannot be achieved by simply releasing the noisy air above the wheels using a radiator mask. It was not sufficient, and there were still problems with noise countermeasures, such as the radiator silencer, which protrudes so much in front of the vehicle track that it does not match the entire south of the vehicle.

The present invention has been made to eliminate the above-mentioned conventional drawbacks.
For this reason, the present invention has a hood with a double structure to form a duct, an intake horizontal structure that sucks cooling air into the engine room through the duct, a noise-reducing louver device installed at the closing part of the radiator guard, and a noise-reducing louver device installed at the closing part of the radiator guard. A radiator silencer device is provided at the front to form a space between the radiator silencer device and the silencing louver device, and a device for recirculating a part of the exhaust air discharged from the silencing louver device into the space into the engine room. The vehicle is characterized by being equipped with an underguard device for the vehicle structure, which minimizes noise emission to the outside of the engine enclosure device, and provides a sense of unity with the vehicle track.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 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 a 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 side guard, 6 is dashboard, 8 is radiator guard, 12 is under guard, 14
16 shows a silencer device installed in the closed portion of the radiator guard 8, and 16 shows a silencer device assembled to the radiator guard B in front of the noise reduction louver device 14.

As shown in the figure, the hood 2 has a double structure including an outer plate 18 and an inner plate 20, and an intake duct 22 is formed between the outer plate 18 and the inner plate 20. The front end of the duct 22 is closed by a plate 24, and the rear part is connected to the engine room 2.
It is said to be the Sekiguchi section 28 where 61 stations pass through. Near the front end of the duct 22, the left and right corners of the hood 2 are formed with punched metal 30', and the punched metal is provided with an intake port 3 for sucking cooling air into the duct 22 from outside the vehicle.
form 2. A sound absorbing material 34 is stretched over almost the entire inner and outer surfaces of the duct 22. The self-silencing louver device 14 includes a plurality of horizontal louvers 36, and these louvers 36 are attached to a fixed frame (not shown).
The fixed frame is detachably attached to the entrance part 9 of the radiator guard 8.

As shown in FIG. 4, each Zenigata louver is formed by surrounding a sound-absorbing material 38 with a punching metal 40 having a sufficient opening ratio, and is designed to prevent noise from flowing from the cooling fan 3. It is installed at a certain angle. In addition, as shown in FIG. 2, the louvers 36 have different cross-sectional shapes, with the horizontal louver 36a directing the noisy air upward, and the horizontal louver 36b directing the noisy air downward. The Zenigata louver 3c is shaped so that a part of the noisy air can be discharged upward and the rest can be discharged downward. The spacing and number of the louvers are determined for each axle so that the engine has sufficient ventilation to prevent overheating and to exhibit a sufficient sound absorption effect. The radiator silencer device 16 is installed at a distance 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 includes a radiator guard 8
Its inside is almost the same as the inside of the radiator guard 8 so as to cover almost the entire surface of the radiator guard 8, and its upper end extends to the same height as the hood 2, and its lower end is smoothly connected to the slanted bottom surface of the under guard 12. ing. 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 of (1 to 3) vertical partition plates 48 are installed to partition 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. outer plate 4
4 is removably attached. The partition plate 48 is formed by surrounding a sound absorbing material with punched metal having a sufficient aperture ratio. Space portion 42 formed by this device 16
The upper end is an open part 50 through which noisy air is discharged to the outside of the vehicle, and the entrance part 50 is covered with a punched metal or the like 52 having a sufficient opening ratio to prevent foreign matter from entering from outside the vehicle. The lower end of the space 42 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 as a double structure. The above-mentioned under guard 12 is an internal plate 5.
6 and an external plate 58 to form a guideway 54, an inlet 60 of the guideway 54 is connected to the lower end of the space 42, and an outlet 62 is closed to the engine frame 26. There is. 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 7 indicates an opening for a muffler.

Next, to describe the operation of the above-mentioned embodiment, cooling air is drawn into the duct 22 from outside the vehicle through the cooling air intake port 32 of the hood 2 by the blowing action of the cooling fan 3, and passes through the duct 22 to the opening 28. It is drawn into the engine frame 26. 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 inside the engine room 26 is dissipated by the sound absorbing material 34 while being dissipated to the outside of the vehicle through the duct 22. Sound is absorbed and reduced. Since the sound absorbing material is stretched 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 also to prevent the generation of chatter noise due to the vibration of the plates 18 and 20. can. Open above□
Cooling air drawn into the engine room 26 from the section 28 passes around the engine 1 and is discharged to the evagator core 5 by the cooling fan 3.

Since the gap between the radiator core 5 and the buffs 72 and 74 is closed, most of the noisy air discharged by the cooling fan 3 passes through the radiator core 5 and is guided to the silencing louver device 14. The silencing louver device 14 is the cooling fan 3
As mentioned above, each louver 36 is angled with respect to the flow of the noisy air, so a good sound absorption effect can be obtained.
Further, since the cross-sectional shapes of each louver 36 are different, the noisy air is dispersed vertically. Noise air passing through the silencing louver device 14 is guided to a radiator silencer device 16 in front of the louver device 14.

The radiation silencer device 16 uses a sound absorbing material 46 to muffle the noisy air, and at the same time guides the noisy air along the space 42, and discharges a part of it to the outside of the vehicle from the upper entrance 50, and the rest to the lower end entrance. 60 to the guideway 54.
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. Space part 4
Noise air guided into the concession route 54 from the concession route 5
4 and is introduced into the engine room 26 from the outlet 62, where it interacts with the cooling air taken in from the cooling air intake port 32 of the hood 2, and returns from the cooling fan 3 to the radiator core 5, the silencing louver device 14, and the radiator. It is circulated with the silencer device 16.

As a result, part of the noise air discharged from the radiator silencer device 16 to the outside of the vehicle can be recirculated into the engine frame 26 through this device, thereby reducing the noise discharged to the outside of the vehicle. Furthermore, since the under guard 12 has a double structure, there is an advantage that noise is less likely to pass through the engine frame 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 opening 28' leading to the engine room 26 is provided at the front of the duct 22. Although a cooling air intake port 32' is provided at the rear of the hood 22, the same effects as those of the previous embodiment can be obtained with this modification.

FIG. 6 shows another modification of the present invention, in which a part of the outer plate 58 is removed near the exit 62 of the guideway 54 formed by the double-layered underguard 12. As shown in the figure, it is formed by a punching plate 78 having a large number of small holes 76, thereby providing a discharge port penetrating to the outside of the vehicle.

This provides the following advantages over the previous embodiments. {1' Since a part of the air recirculated to the engine room 26 is discharged to the outside of the vehicle, this is advantageous in terms of preventing engine overheating.

{2- Due to the air outlet outside the vehicle, the air ventilation condition in the taxiway 54 is improved, and the amount of downward air that is branched by the muffling louver device 14 is increased, which is then discharged upward by the radiator silencer device 16. The amount of noise generated can be reduced.

(3) ÷Since the noise level behind the general wheels (on the opposite side from the engine) is low, the noise level behind the wheels will increase even if the noisy air is discharged toward the rear of the lower side of the car than in this modification. is hardly a problem.

t4- Most of the air discharged from the air outlet of this modification to the rear of the lower side of the vehicle is absorbed by the sand and the like adhering to the ground or the wheel suspension device, and the noise is reduced.

FIG. 8 shows still another modification of the present invention, in which an air cooler 80 is installed in the guideway 54 formed by the double-layered underguard 12.
Thereby, the air recirculated into the engine room 26 through the yield path 54 can be cooled, and overheating of the engine can be more effectively prevented.

FIG. 9 shows still another modification of the present invention, in which a space 42 formed by the radiator silencer device 16 and a guideway 54 formed by the double-layer underguard 12 are connected. A portion of the outer plate 58 of the radiator guard near the connection part is provided with a number of small holes 8 that can be opened by means of a hinge 82, as shown in FIG.
4, thereby forming an air exhaust port penetrating to the outside of the vehicle at the bottom of the space 42.

As a result, for the same reasons as in the modified example shown in Fig. 6, (1) it is advantageous in terms of preventing engine overheating, and (2) the ventilation condition in the taxiway 54 is improved, and noisy air is discharged downward from the vehicle. Since the sound is absorbed by the ground, there is an advantage that the noise level does not substantially increase.Furthermore, in this modified example, foreign matter such as soil and stones that have entered through the upper closed part 50 of the radiator silencer device 16 are removed from the plate. Opening 86 provides the advantage of easy evacuation. FIG. 11 shows still another modification of the present invention, in which the radiator silencer device 1
As shown in the figure, the plate 44 of No. 6 is recessed rearward from near the center to the bottom, and a portion of the silencing louver device 14 and the under guard 12 are modified accordingly.

As a result, the work equipment mounting frame and radiator silencer device 1 are installed in front of the wheel in the earthmoving wheel.
This is to avoid interference with 6. Although not particularly shown, the horizontal louver 3 of the sound deadening louver device 14
6, the installation of the horizontal louver 36 is not a fixed type but a variable type in order to provide the louver angle that provides the most appropriate noise air flow depending on the environmental changes such as the season of use and the place of use of the vehicle. You can also.

Further, although not specifically mentioned, other configurations of the modified example shown in FIGS. 5 to 11 can be the same as the configuration of the embodiment shown in FIGS. 2 to 4.

As described above, according to the present invention, it is possible to obtain an engine enclosure device that can minimize noise emission to the outside of the engine enclosure device without losing engine cooling characteristics and has a sense of unity with the vehicle.

The device of the present invention can also be applied to an enclosing device for engines other than earthmoving vehicles, such as construction machinery engines.

[Brief explanation of the drawing]

FIG. 1 is a side view of an earthmoving wheel 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 according to the present invention, and FIG. 3 is the same figure 2. FIG. 4 is a sectional view of the louver, FIG. 5 is a side partial sectional view showing a modification of the device of the present invention, and FIG. 6 is a partial cross-sectional view of the device of the present invention. FIG. 7 is a partial cross-sectional side view showing another modification of the device; FIG. 7 is a view taken along the line blood-skin in FIG. 6; FIG. 8 is a diagram showing still another modification of the device of the present invention. , FIG. 9 is a view similar to FIG. 6 showing still another modification of the device of the present invention, FIG. 10 is a view taken along the line X-X in FIG. 9, and FIG. FIG. 2 is a diagram similar to FIG. 2 showing a further 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 frame, 28...
Sekiguchi, 32... Suction port, 34... Sound absorbing material, 36a, 36b, 36c... ...Luba, 42
...Space part, 44...Plate, 46
...Sound absorbing material, 50...Opening, 54...
... Taxiway, 56, 58...Plate, 60...
...Inlet, 62...Outlet, 76, 84...Discharge port, 8
0...Air cooler. Figure 2, figure 4, figure 3, figure 5, figure 3, hair, figure 8, bag? Illustrated scroll/o-illustration'' drawing

Claims (1)

[Scope of Claims] 1. In an engine enclosure device having a hood, a radiator guard, a side guard, and an under guard, the hood has a double structure to form a duct, one end of the duct is closed, and the duct is closed near the one end. An outside air intake port is provided in the hood, the other end of the duct is opened to the engine room, a sound absorbing material is provided on the duct, a sound-absorbing louver device is installed in the opening of the radiator guard, and the sound-deadening louver device is provided. A radiator silencer device that covers almost the entire surface of the radiator guard is provided with a space between it and the silencing louver device in front of the radiator. An engine enclosure device characterized in that the under guard is connected to an entrance of a guideway formed in a double structure, and further the outlet of the guideway is opened to an engine room. 2. The device according to item 1, wherein the outside air inlet provided in the hood is provided at the front or rear of the hood. 3. The silencing louver device includes a plurality of horizontal louvers installed at an angle with respect to the flow of noisy air discharged from the engine room, and the louvers are configured to have a fixed angle or an adjustable angle with respect to the flow of noisy air. The device of paragraph 1. 4. The device according to item 1, wherein the radiator silencer device is composed of a plate with a sound-absorbing material stretched on the inner surface, and the plate is substantially flat over the entire silencer device, or is recessed rearward from near the center to the bottom. . 5. The device according to item 1, wherein the under guard is provided with a noisy air outlet at the bottom of the space. 6. The device of item 1, wherein an air cooler is provided within the guideway. 7. The device according to item 1, wherein the under guard is provided with a noisy air outlet near the exit of the guideway.