JP3783373B2 - Engine room sound absorber - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sound absorbing blade disposed in an outside air suction portion provided on a wall surface of an engine room, and more particularly to a sound absorbing blade in an engine room having two different directions of outside air suction portions.
[0002]
[Prior art]
Conventionally, various proposals have been made for sound absorbing blades for reducing engine room noise. As techniques close to the present invention, there are JP-A-57-137616, JP-A-56-116520, JP-A-64-1150, and JP-A-6-144422.
[0003]
(1) In Japanese Patent Laid-Open No. 57-137616, cooling air discharged by a cooling fan of an engine cools a radiator, passes through a silencer louver device of a radiator guard, and is formed between the radiator silencer device. It is discharged into the space. A part of the cooling exhaust air is discharged from the exhaust port at the upper part of the space, and the rest is discharged to the air duct of the double structure engine under guard connected to the lower part of the space. A switching device is provided at the end of the air guide path, and the cooling exhaust air is returned to the engine room via the outlet to increase the silencing effect by operating the opening and closing plate, or it is discharged outside to enhance the cooling effect. I can do it.
[0004]
(2) In Japanese Patent Application Laid-Open No. 56-116520, each sound absorbing louver attached to the frame is disposed so as to be inclined such that its front edge is higher than its rear edge. As a result, an air exhaust passage directed obliquely upward toward the front of the vehicle is formed by a gap between each pair of adjacent sound absorbing louvers. For this reason, the noise air discharged from the engine room by the cooling fan is not discharged to the front of the vehicle, collides with the sound absorbing louver at one end through the sound absorbing grille, and is reduced and decelerated there, then along the passage To be discharged. For this reason, the noise air discharged from the sound absorbing grille does not soar light weight materials such as pulverized coal or chips in front of the sound absorbing grille handled by the vehicle.
[0005]
(3) In Japanese Utility Model Application No. 64-1150, a plurality of sound absorbing louvers arranged in parallel are connected to each other with pins, and the interval can be adjusted by changing the inclination of the sound absorbing louver. However, when the heat balance is deteriorated during work, the interval between the sound absorbing louvers can be increased to reduce the flow resistance of the cooling air. It can be dissipated upward.
[0006]
(4) Japanese Patent Laid-Open No. 6-144022 discloses a configuration of a traveling work vehicle in which exhaust air from a radiator opening is discharged from an engine bonnet, and a splitter silencer is installed in close contact with the radiator opening. Installed on the hood side to prevent the cooling air inside the engine bonnet from wrapping around, install the radiator so that the center of the cooling fan shaft is above the center of the cooling pump shaft, and split the exhaust air from the radiator opening It is assumed that the sound is discharged downward by a silencer.
[0007]
[Problems to be solved by the invention]
However, according to the configuration proposed in Japanese Patent Application Laid-Open No. 57-137616, the opening / closing plate is operated in accordance with the driving situation to enhance the silencing effect or the cooling effect, which is troublesome. Further, when the open / close plate is closed, the hot air is recirculated, and there is a problem that the cooling effect is reduced.
[0008]
According to the configuration proposed in Japanese Patent Laid-Open No. Sho 56-116520, each sound absorbing louver is disposed obliquely upward so as to prevent the powdered charcoal or chips from being raised by exhaust air, and is applied to the outside air suction portion. There is no particular advantage in this case. In particular, due to the vehicle body structure, a sufficient intake area cannot be ensured with only the outside air suction portion from one direction, and application is difficult when the outside air suction portion is provided in two different directions.
[0009]
According to the configuration proposed in Japanese Utility Model Laid-Open No. 64-1150, it is necessary to operate the sound absorbing louver when noise is reduced and when the cooling effect is enhanced. In addition, as in the previous section, it is difficult to apply to the outside air suction part from two different directions.
[0010]
According to the configuration proposed in Japanese Patent Laid-Open No. 6-144022, the splitter silencer is closely attached to the radiator opening and attached to the engine bonnet side to prevent the cooling air from entering. Therefore, it is difficult to apply to the outside air suction part from two different directions.
[0011]
The present invention has been made paying attention to the above-mentioned problems. When used in an engine room having an outside air suction portion from two different directions, the present invention has a large silencing effect, a low airflow resistance and a high cooling effect. The object is to provide a sound absorbing blade.
[0015]
[Means, actions and effects for solving the problems]
In order to achieve the above object, a first aspect of the present invention is a sound absorbing device that is disposed in an outside air suction portion provided on a wall surface of an engine room of a construction machine and that reduces engine noise. The sound absorbing device has a sound absorbing blade arranged in parallel in the vertical direction. The lower side with a long air passage length is a split type sound absorbing device, and the upper side with a short air passage length is a cell type sound absorbing device. The width of the sound absorbing blade of the cell type sound absorbing device is made narrower than the width of the sound absorbing blade of the split type sound absorbing device, and the width of the sound absorbing blade of the split type sound absorbing device is sequentially adjusted according to the round shape of the vehicle body in plan view. In addition to the change, the pitch between the sound absorbing blades is set to an unequal pitch in proportion to the width of the sound absorbing blade.
[0016]
According to the first aspect of the present invention, the present invention can be effectively applied to a round-shaped vehicle body in a plan view such as an upper swing body of a hydraulic excavator. In addition, since the pitch between the sound absorbing blades in the narrow part of the sound absorbing blade is reduced, the surface area of the sound absorbing blade with respect to the passing air volume of this part is increased, the sound absorbing effect is improved, and the sound absorbing performance with other parts is made almost the same. And the overall silencing effect is increased.
[0017]
According to a second aspect of the present invention, in the engine room sound absorbing device according to the first aspect of the invention, the pitch between the sound absorbing blades is matched with the pitch of the vertical lattice of the exterior grill of the vehicle body.
[0018]
According to the second aspect of the invention, the air flow is smoothed to reduce the intake resistance, and the cooling efficiency is improved.
[0019]
According to a third aspect of the present invention, there is provided a sound absorbing device that is disposed in an outside air suction portion provided on a wall surface of an engine room of a construction machine and that reduces engine noise. An outside air suction portion is provided on the side and above the engine room. It has sound absorbing blades arranged in parallel in the vertical direction, the lower side with a long air passage length is configured as a split type sound absorbing device, and the upper side with a short air passage length is configured as a cell type sound absorbing device. The width of the sound absorbing blade of the device is narrower than the width of the sound absorbing blade of the split type sound absorbing device, and the width of the sound absorbing blade of the split type sound absorbing device is sequentially changed according to the round shape of the vehicle body in plan view, and between the sound absorbing blades An unequal cell structure is used in which the pitch is equal and the narrow portion is increased in inverse proportion to the width.
[0020]
According to the third invention, since the number of cells is increased in inverse proportion to the width of the sound absorbing blade of the split type sound absorbing device, the surface area of the sound absorbing blade is increased with respect to the passing air volume in the narrow portion, and the silencing effect is increased. The sound absorption performance of this part can be made substantially the same.
[0021]
According to a fourth aspect of the present invention, in the engine room sound absorbing device according to any one of the first to third aspects, the sound absorbing blade is formed by integrally molding a hard sound absorbing material.
[0022]
According to the fourth invention, since the sound absorbing blade is an integrally molded product of a hard sound absorbing material (such as a hard sponge), good sound absorbing performance can be obtained.
[0023]
According to a fifth aspect of the present invention, in the engine room sound absorbing device according to any one of the first to third aspects, the sound absorbing blade is formed by attaching a sound absorbing material to both surfaces of a core plate material.
[0024]
According to the fifth aspect of the invention, the bending strength is high and the production of the sound absorbing blade is extremely easy. The core plate material is preferably a sound insulating or breathable plate.
[0025]
According to a sixth aspect of the present invention, in the engine room sound absorbing device according to any one of the first to third aspects of the invention, the sound absorbing blade includes a sound absorbing material enclosed in a plate having air permeability.
[0026]
According to the sixth aspect of the invention, since the sound absorbing material is included in the air-permeable plate material (for example, punching metal or expanded metal), the selection range of the sound absorbing material is widened and the strength of the sound absorbing blade is improved.
[0028]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiments of a multi-way sound absorbing blade according to the present invention will be described below in detail with reference to FIGS.
[0029]
In general, the structure of the sound absorbing blade 13 includes a cell type sound absorbing device 11 in which a sound absorbing plate 14 is combined in a cylindrical shape as shown in FIG. 1, and a split type sound absorbing device 12 in which the sound absorbing blades 13 are arranged in parallel as shown in FIG. There are two types. The cell-type sound absorbing device 11 has a long ridge line with respect to the air passage area. Therefore, even if the length L of the cell type sound absorbing device 12 is short, the surface area of the sound absorbing plate 14 with respect to the passing air volume becomes large, and the sound absorbing performance is good. Since the split type sound absorbing device 12 has few obstacles, the ventilation resistance is small. In order to improve the sound absorbing performance, the width W of the sound absorbing blade 13 is increased, or the pitch P is decreased to increase the surface area of the sound absorbing blade 13 with respect to the passing air volume.
[0030]
FIG. 3 is a side sectional view of the engine room 1. In the engine room 1, a multi-way sound absorbing device 10, a radiator 2, and an engine 3 are sequentially arranged from the front. A side surface outside air suction part 4 and a top surface outside air suction part 5 are provided on the front surface and front upper surface of the engine room 1.
[0031]
FIG. 4 is a perspective view of the sound absorbing device 10 of the first embodiment. As shown in FIG. 3, the air passage length L of the upper surface outside air suction portion 5 is shorter than the air passage length W of the side surface outside air suction portion 4 (width of the sound absorbing blade 13). As shown in FIG. 4, the plurality of sound absorbing blades 13 are arranged in parallel in the vertical direction, the lower part constitutes a split type sound absorbing device 12, and the upper part has a front sound absorbing plate 14a and a rear sound absorbing plate 14b in the front and rear. Are arranged to constitute the cell type sound absorbing device 11. That is, the air passing length L of the cell type sound absorbing device 11 is shorter than the width W of the sound absorbing blade 13. The sound absorbing blade 13 is formed by integrally molding a hard sound absorbing material 20 (for example, a hard sponge).
[0032]
Next, other embodiments of the sound absorbing blade 13 will be described with reference to FIGS. FIG. 5 is a perspective view of the sound absorbing blade 13a of the second example, in which the sound absorbing material 20 is pasted on both surfaces of the sound insulating or breathable core plate material 21, which has a high bending strength and is easy to manufacture.
[0033]
FIG. 6 is a perspective view of the sound absorbing blade 13b of the third example, in which the sound absorbing material 20 is enclosed by a plate 22 having air permeability (for example, punching metal or expanded metal). Therefore, the strength is high and the selection range of the sound absorbing material 20 is wide.
[0034]
FIG. 7 is a perspective view of the sound absorbing blade 13c of the fourth example, in which the sound absorbing material 20 is pasted on both sides of a breathable core plate material 23 (for example, punching metal, expanded metal, punched metal net [trade name], etc.). It has good sound absorption performance.
[0035]
The above example can also be applied to the front sound absorbing plate 14a and the rear sound absorbing plate 14b.
[0036]
Next, the operation will be described with reference to FIG. Since the engine room 1 is provided with the side surface outside air suction part 4 and the top surface outside air suction part 5, a sufficient outside air suction area can be secured. Noise that leaks outside through the side outside air suction portion 4 is sufficiently reduced because the width W of the sound absorbing blade 13 that passes therethrough is long. In addition, since the split type sound absorbing device 12 is used, the ventilation resistance is small and the cooling performance is improved. Although the upper surface outside air intake section 5 has a short passage length L but constitutes the cell type sound absorbing device 11, the sound absorbing performance is improved, and the sound absorbing performance can be made substantially the same as that of the split type sound absorbing device 12. Improves sound absorption performance.
[0037]
FIG. 8 is a perspective view of the sound absorbing device 10a of the second embodiment, and the air passage length L of the upper surface outside air suction portion 5 is larger than the air passage length W of the side surface outside air suction portion 4. Therefore, the upper part is configured as the split type sound absorbing device 12, and the lower part is configured as the cell type sound absorbing device 11. Since the operation and effect are the same as those of the first embodiment, description thereof is omitted.
[0038]
FIG. 9 is a side sectional view of the engine room 1 of the hydraulic excavator of the construction machine, and FIG. 10 is a plan sectional view thereof. In the engine room 1, a multi-way sound absorbing device 10b, a radiator 2, and an engine 3 are sequentially arranged from the side. In the case of a hydraulic excavator, the engine room 1 is generally located at the rear part of the upper swing body, and therefore a counterweight 6 is arranged. For this reason, it is difficult to enlarge the side surface outside air suction part 4, and the side surface outside air suction part 4 is used in combination with the top surface outside air suction part 5. Moreover, from the relationship with the radiator 2, the air passage length L of the upper surface outside air suction portion 5 is shorter than the air passage length W of the side surface outside air suction portion 4. Also, the outside air suction width B at the top of the sound absorbing device 10b is narrower than the width W at the bottom from the viewpoint of the external shape. The sound absorbing device 10b has a plurality of sound absorbing blades 13 arranged in parallel in the vertical direction, the lower part thereof constitutes a split type sound absorbing device 12, and the upper part is provided with a front sound absorbing plate 14a and a rear sound absorbing plate 14b, and is a cell type. The sound absorbing device 11 is configured.
[0039]
As shown in FIG. 10, the rear part of the upper swing body of the excavator has a round shape. Accordingly, the engine room 1 has a round shape, and the width W of the sound absorbing blade 13 of the split type sound absorbing device 12 is sequentially changed from WA to WX in accordance with the round shape. Reference numeral 7 denotes an exterior grill that can be freely opened and closed.
[0040]
FIG. 11 is a perspective view of the split type sound absorbing device 12 below the sound absorbing device 10b, and FIG. 12 is a front view. As described above, the width W of the sound absorbing blade 13 sequentially changes between WA and WX, and WA> WX. Therefore, the sound absorption performance is reduced on the WX side. Therefore, the pitch P between the sound absorbing blades 13 is changed in proportion to the width W of the sound absorbing blades 13. That is, the range between PA and PX is sequentially changed so that PA> PX. Thereby, the surface area of the sound absorbing blade 13 with respect to the passing air volume becomes substantially equal, and the sound absorbing performance of each part becomes substantially the same, improving the overall sound absorbing performance.
[0041]
The split type sound absorbing device 12 as shown in FIG. 11 can be applied to both the suction side and the discharge side as indicated by arrows.
[0042]
FIG. 13 is a view taken in the direction of arrow A in FIG. The pitches PA to PX of the sound absorbing blade 13 and the pitches CA to CX of the vertical lattice 8 of the exterior grill 7 are matched.
[0043]
FIG. 14 is a plan sectional view of the sound absorbing blade 13. The thickness T1 of the front end portion of the sound absorbing blade 13 is made thinner than the thickness T of the rear portion, and a tapered portion 24 is provided. The thickness T1 of the front end portion of the sound absorbing blade 13 is substantially the same as the width D of the vertical lattice 8 of the exterior grill 7, and since the position is aligned as described above, the intake air flows smoothly as indicated by the arrows. Reduce ventilation resistance.
[0044]
FIG. 15 is a perspective view showing a mounting state of the sound absorbing blade 13, and FIG. 15 and 16, the lower end portion of the sound absorbing blade 13 is inserted into a lower holder 31 provided on the floor surface 30 of the engine room 1, and the upper portion of the rear edge of the sound absorbing blade 13 is attached to the front surface of the radiator 2. The upper holder 32 is inserted and supported. Therefore, as shown in FIG. 16, the exterior grille 7 can be opened, and the sound absorbing blade 13 can be inserted from the side surface outside air suction portion 4 and reversed to be attached at the position indicated by the thin two-dot chain line. Therefore, the replacement work of the sound absorbing blade 13 is extremely easy.
[0045]
FIG. 17 is a perspective view showing another embodiment of the split type sound absorbing device 12, and FIG. 18 is a front view thereof. The width W of the sound absorbing blade 13 changes sequentially from WA to WX (WA> WX), but the pitch P is the same. Then, the sound absorbing blade 13 is provided with a lateral sound absorbing plate 16 at a portion where the width W is small to constitute the cell type sound absorbing device 11. The pitch Q of the lateral sound absorbing plate 16 changes from QA to QX (QA> QX) in proportion to the width W of the sound absorbing blade 13. That is, the number of cells increases in inverse proportion to the width W of the sound absorbing blade 13. Since the function and effect are the same as those described with reference to FIGS. 11 and 12, a description thereof will be omitted.
[Brief description of the drawings]
FIG. 1 is a perspective view of a cell type sound absorbing device.
FIG. 2 is a perspective view of a split type sound absorbing device.
FIG. 3 is a side cross-sectional view of an engine room.
FIG. 4 is a perspective view of the first embodiment of the sound absorbing device.
FIG. 5 is a perspective view of a second example of a sound absorbing blade.
FIG. 6 is a perspective view of a third example of a sound absorbing blade.
FIG. 7 is a perspective view of a fourth example of a sound absorbing blade.
FIG. 8 is a perspective view of a second embodiment of the sound absorbing device.
FIG. 9 is a side sectional view of an engine room of a construction machine.
FIG. 10 is a plan sectional view of the same.
FIG. 11 is a perspective view of a split type sound absorbing device of the sound absorbing device.
FIG. 12 is a front view of the same.
FIG. 13 is a front view of the engine room of the construction machine.
FIG. 14 is a plan sectional view of a sound absorbing blade.
FIG. 15 is a perspective view showing a support state of the sound absorbing blade.
FIG. 16 is a drawing showing a method for replacing a sound absorbing blade.
FIG. 17 is a perspective view of another embodiment of the split type sound absorbing device.
FIG. 18 is a front view of the same.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Engine room 2 Radiator 3 Engine 4 Side surface outside air suction part 5 Upper surface outside air suction part 6 Counterweight 7 Exterior grille 8 Vertical lattice 10, 10a, 10b Sound absorber 11 Cell type sound absorber 12 Split type sound absorbers 13, 13a, 13b, 13c Sound absorbing blade 14a Front sound absorbing plate 14b Rear sound absorbing plate 16 Horizontal sound absorbing plate 20 Sound absorbing material 21, 23 Core plate material 22 Plate material 31 Lower holder 32 Upper holder

Claims (6)

In the sound absorbing device (10) that is disposed in the outside air suction portion (4, 5) provided on the wall surface of the engine room (1) of the construction machine and reduces engine noise,
Outside air intakes (4, 5) are provided on the side and above the engine room (1),
The sound absorbing device (10) has a sound absorbing blade (13) arranged in parallel in the vertical direction,
The lower side with a long air passage length is a split type sound absorber (12),
The upper side with a short air passage length is configured as a cell-type sound absorber (11).
The width (B) of the sound absorbing blade (13) of the cell type sound absorbing device (11) is made narrower than the width (W) of the sound absorbing blade (13) of the split type sound absorbing device (12),
The width (W) of the sound absorbing blade (13) of the split type sound absorbing device (12) is sequentially changed in accordance with the round shape of the vehicle body in plan view, and the pitch (P) between the sound absorbing blades (13) is changed to the sound absorbing blade ( The engine room sound absorbing device is characterized by having an unequal pitch in proportion to the width (W) of 13). In the engine room sound absorbing device according to claim 1 ,
A sound absorbing device for an engine room, wherein the pitch between the sound absorbing blades (13) and the pitch of the vertical lattice of the exterior grill of the vehicle body are matched. In the sound absorbing device (10) that is disposed in the outside air suction portion (4, 5) provided on the wall surface of the engine room (1) of the construction machine and reduces engine noise,
Outside air intakes (4, 5) are provided on the side and above the engine room (1),
The sound absorbing device (10) has a sound absorbing blade (13) arranged in parallel in the vertical direction,
The lower side with a long air passage length is a split type sound absorber (12),
The upper side with a short air passage length is configured as a cell-type sound absorber (11).
The width (B) of the sound absorbing blade (13) of the cell type sound absorbing device (11) is made narrower than the width (W) of the sound absorbing blade (13) of the split type sound absorbing device (12),
The width (W) of the sound absorbing blade (13) of the split type sound absorbing device (12) is sequentially changed according to the round shape of the vehicle body in plan view,
The pitch (P) between the sound-absorbing blades (13) is the same pitch, and the narrow part of the width (W) has an unequal cell structure that increases the number of cells in inverse proportion to the width (W). The engine room sound absorber. In the engine room sound absorbing device according to any one of claims 1 to 3,
The sound absorbing blade (13) is formed by integrally molding a hard sound absorbing material (20). In the engine room sound absorbing device according to any one of claims 1 to 3,
The sound absorbing blade (13) is formed by adhering a sound absorbing material (20) to both surfaces of a core plate material (21). In the engine room sound absorbing device according to any one of claims 1 to 3,
The sound-absorbing blade (13) includes a sound-absorbing material (20) enclosed in a plate member (22) having air permeability.

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