JPH0451058Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a noise prevention device applied to a work vehicle such as a skid steer type shovel loader.

(Prior Art) Conventionally, as work vehicles such as skid steer type shovel loaders, those shown in FIGS. 5 and 6, for example, have been known.

The work vehicle 100 includes an engine room 102 formed inside the rear of a vehicle body 101, an engine 103 provided in the engine room 102,
Inside the rear of the vehicle body 101 and in the engine room 10
2, an air passage 106 is formed in front of the vehicle body 10 and has an inlet 104 on the front side and an outlet 105 on the upper side, and
Left and right vertical plates 107 provided on both rear sides of 1
A fan 108 provided in the middle of the air passage 106 and rotationally driven by the engine 103, a radiator 109 provided near the outlet 105 of the air passage 106, and an appropriate number of cut and raised pieces 110 and openings 111 are formed. A plate-shaped radiator cover 112 is provided to cover the outlet 105 of the air passage 106.
It has the following.

In such a work vehicle 100, when the engine 103 is started, the fan 108 is rotated.
This allows external air (cooling air) to flow through air passage 1.
06 → air passage 106 → radiator 109 → outlet 105 of air passage 106 → opening 111 of radiator cover 112 and is discharged into the atmosphere.

However, the cooling air is accompanied by the noise of the engine 103 and the wind noise of the fan 108 in the air passage 106, and this is guided especially by the cut and raised pieces 110 of the radiator 112 and is discharged only diagonally upward to the rear. Therefore, the rear noise becomes extremely loud compared to the noise from the other three directions (front noise, left side noise, right side noise), and there is a problem that the surrounding noise centered on the so-called work vehicle 100 is not uniform. Ta.

(Problems that the invention attempts to solve) This invention was created in view of the problems mentioned above and to solve them, and its purpose is to:
To provide a noise prevention device for a working vehicle, which equalizes ambient noise mainly from the working vehicle.

(Means for Solving the Problems) The noise prevention device for a work vehicle of the present invention has an engine room formed inside the rear of the vehicle body, an engine provided in the engine room, and an engine inside the rear of the vehicle body. An air passage formed at the front of the room with an inlet on the front side and an outlet on the upper side, vertical plates on the left and right sides installed on both sides of the rear of the vehicle body to protrude above the outlet of the air passage, and in the middle of the air passage a fan provided in the engine and rotationally driven by the engine;
In a work vehicle equipped with a radiator provided near the outlet of an air passage, the upper wall is recessed in the middle from both left and right ends, and the front portions of both left and right ends abut against the left and right vertical plates, and the front end of the upper wall. The front wall is perpendicular to the top wall and its left and right ends are in contact with the left and right vertical plates, the back wall is suspended from the rear end of the upper wall, the sound absorbing material is attached to the inner surface of each wall, and an inlet formed below the enclosed internal space and connected to the outlet of the air passage; an upper outlet formed between the rear portions of the left and right ends of the upper wall and the left and right vertical plates; and an upper outlet formed between the left and right vertical plates of the upper wall; The feature lies in the provision of a noise prevention device consisting of both ends and a rear exit formed between the left and right vertical plates.

(Function) When the engine is started, the fan is rotated.

Due to the rotation of the fan, external air (cooling air) is
It is discharged into the atmosphere through the inlet of the air passage → the air passage → the radiator → the outlet of the air passage → the inlet of the noise prevention device → the internal space of the noise prevention device → the upper and rear exits of the noise prevention device.

At this time, the cooling air is accompanied by engine noise and fan wind noise in the air passage.

However, after the cooling air accompanied by noise flows into the internal air from the entrance of the noise prevention device, it collides with the upper wall and is diverted to the left and right, and the cooling air that has been diverted to each branch is divided into left and right branches. The air collides with the vertical plate again, changes its direction, and is discharged to the outside through the upper and rear exits, so due to these two collisions and the sound-absorbing material affixed to the inner surface of each wall, the cooling air accompanies it. Noise is effectively attenuated.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 is a side view showing only the main parts of a work vehicle to which a noise prevention device according to an embodiment of the present invention is applied. FIG. 2 is a perspective view thereof. Figure 3 is its plan view. FIG. 4 is a perspective view showing only the noise prevention device.

The noise prevention device 1 is applied to a work vehicle 100, and main parts thereof include an upper wall 2, a front wall 3, a rear wall 4, a sound absorbing material 5, an inlet 6, an upper outlet 7, and a rear outlet 8.

The work vehicle 100 includes an engine compartment 102 formed inside the rear of the vehicle body 101, an engine 103 provided in the engine compartment 102, and an engine compartment 103 located inside the rear of the vehicle body 101 and in front of the engine compartment 102. An air passage 106 with an outlet 105 on the upper side of the inlet 104, left and right vertical plates 107 provided on both rear sides of the vehicle body 101 so as to protrude above the outlet 105 of the air passage 106, and an air passage 107 provided in the middle of the air passage 106. engine 103
It has a fan 108 that is rotationally driven by a radiator 108 and a radiator 109 provided near the outlet 105 of the air passage 106.

In this example, the skid steer type shovel loader is used, that is, a shovel loader that can turn on the spot, and left and right wheels 113 are installed at the front and rear of the vehicle body 101.
At the top of the front half of the vehicle body 101, a driver's seat (not shown) and a head guard 114 surrounding it are mounted on a vertical plate 107.
Left and right booms 115 are pivotally connected to the upper part of the base end so as to be tiltable and extend forward, and between the vertical plate 107 and the boom 115 are left and right boom sills 1.
16, a bucket (not shown) is pivotally connected to the tip of each boom 115 so as to be able to move up and down, and a bucket cylinder (not shown) is connected between the boom 115 and the bucket.
However, each is provided separately.

Specifically, the air passage 106 is approximately J
An inlet 104 is formed in the form of a mold on both sides of the head guard 114, and a fan 108 is formed in the form of a white fan and is disposed below the air passage 106.

The upper wall 2 is recessed in the middle from both left and right ends, and the front portions of the left and right ends abut against the left and right vertical plates 107.

In this example, the flat plate is bent into a V-shape in front, and the rear portions of both left and right ends are cut out.

The front wall 3 is vertically installed on the front end of the upper wall 2, and its left and right ends abut against the left and right vertical plates 107.

In this example, the upper part of the flat plate is cut out in a V-shape in correspondence with the upper wall 2, and is connected to the front end of the upper wall 2 by welding.

The rear wall 4 is vertically installed at the rear end of the upper wall 2.

In this example, the upper part of the flat plate is cut out in a V-shape in correspondence with the upper wall 2, and is connected to the rear end of the upper wall 2 by welding.

The sound absorbing material 5 is attached to the inner surface of each wall 2, 3, 4.

In this example, polyurethane foam of a predetermined thickness is attached.

The inlet 6 is formed below the interior space 9 surrounded by each wall 2, 3, 4 and is connected to the outlet 1 of the air passage 106.
05.

The upper outlet 7 is formed between the rear portions of the left and right ends of the upper wall 2 and the left and right vertical plates 107.

The rear exit 8 is formed between the left and right ends of the rear wall 4 and the left and right vertical plates 107.

Incidentally, mounting walls 10 extending forward and backward are connected to the lower portions of the front wall 3 and the rear wall 4, respectively, and an appropriate number of notches 11 are cut in these, so that the rear wall 4 A through hole 1 for inserting the muffler 117 in part
2 is drilled.

Thus, the so-called exhaust duct consisting of the upper wall 2, the front wall 3, the rear wall 4, and the sound absorbing material 5 has an inlet 6 that is connected to the air passage 106 instead of the conventional radiator cover 112.
It is arranged between the left and right vertical plates 107 to communicate with the outlet 105 of the vehicle, and is attached to the vehicle body 101 using the notch 11 with a mounting bolt 13.

After installation, the upper outlet 7 and the rear outlet 8 are connected to each other depending on the relationship with the left and right vertical plates 107, thereby completing the noise prevention device 1.

Next, the operation will be explained based on such a configuration.

When the engine 103 is started, the fan 108 is rotated, so that the outside air (cooling air) is
Inlet 104 of air passage 106 → Air passage 106 →
Radiator 109 → outlet 105 of air passage 106
-> Inlet 6 -> Internal space 9 -> Upper outlet 7 and rear outlet 8 to be discharged into the atmosphere.

The cooling air is supplied to the engine 1 at the air passage 106.
The noise from the 03 and the wind noise from the fan 108 are included.

However, the cooling air accompanied by noise is
After flowing into the internal space 9, it collides with the upper side 2, branches to the left and right, and changes direction.

The branched cooling air is guided by the upper wall 2, front wall 3, and rear wall 4, then collides with the left and right vertical plates 107 to change direction, and is guided by the left and right vertical plates 107 to the upper outlet 7. and is discharged to the outside from the rear exit 8.

Therefore, the noise accompanying the cooling air is effectively attenuated by the two collisions and the sound absorbing material 5.

The Ministry of Construction certifies vehicles with low-noise specifications, and the standards are evaluated based on ambient noise (average noise in front, rear, left and right directions), and are set at 77 dB or less.

Therefore, when we conducted an experiment based on these standards, we found that the front noise was 69 (70), the left and right side noise was 74 (76), the rear noise was 78 (81), and the ambient noise was 78 (81). It was 73,75 (75,75). However, the unit is
dB, figures in brackets are for the conventional case.

As is clear from the above experimental results, rear noise is
It can be seen that the noise has been reduced by a relatively large amount compared to the noise from the other three directions, and along with this, the ambient noise fully satisfies the standards of the Ministry of Construction.

Although the upper wall 2 is V-shaped from the front in the previous embodiment, the upper wall 2 is not limited to this, and may be approximately U-shaped from the front, for example.

In the previous embodiment, the front wall 3 and the rear wall 4 are provided with a mounting wall 10 having a notch 11, but the mounting wall 10 is not limited to this, and may be omitted, for example.

In the previous embodiment, the sound absorbing material 5 is provided on each wall 2, 3, 4.
Although it is attached only to the inner surface of the vertical plate 107, the present invention is not limited to this, and it may also be attached to the inner surfaces of the left and right vertical plates 107, for example.

The upper outlet 7 and the rear outlet 8 are, in the previous embodiment,
Although they are connected, they are not limited to this, and may be separated, for example.

(Effects of the invention) As described above, according to the present invention, the following excellent effects can be achieved.

(1) A noise prevention device consisting of a top wall, front wall, rear wall, sound absorbing material, entrance, upper exit, and rear exit is installed, so ambient noise mainly from work vehicles can be equalized.

(2) The upper wall is recessed in the middle, so the rear view from the driver's seat is not obstructed.

(3) Since the upper wall is recessed in the middle, the cooling air that flows in from the inlet is evenly divided and guided in the left and right directions.

(4) Since the vertical plate of the work vehicle is used, the structure of the noise prevention device is simplified.

(5) Since it is installed in place of the conventional radiator cover, it can be easily installed without modifying the work vehicle.

Therefore, it can also be applied to existing vehicles.

[Brief explanation of the drawing]

FIG. 1 is a side view showing only the main parts of a work vehicle to which a noise prevention device according to an embodiment of the present invention is applied. FIG. 2 is a perspective view thereof. Figure 3 is its plan view. FIG. 4 is a perspective view showing only the noise prevention device. FIG. 5 is a side view showing only the main parts of a conventional work vehicle. FIG. 6 is a perspective view thereof. 1...Noise prevention device, 2...Top wall, 3...Front wall, 4...Rear wall, 5...Sound absorbing material, 6...Inlet, 7
...Upper exit, 8...Rear exit.

Claims (1)

[Scope of utility model registration request] An engine room formed inside the rear of the vehicle body, an engine installed in the engine room,
An air passage is formed inside the rear of the car body and in front of the engine room, with an inlet on the front side and an outlet on the upper side, and vertical air passages on the left and right sides of the car body that protrude above the outlet of the air passage. In a work vehicle that has a plate, a fan installed in the middle of an air passage and rotated by an engine, and a radiator installed near the outlet of the air passage, the left and right sides are recessed in the middle from both left and right ends. A top wall whose front portions at both ends abut the left and right vertical plates, a front wall that hangs from the front end of the top wall and whose left and right ends abut the left and right vertical plates, and a front wall that hangs from the rear end of the top wall. sound-absorbing material affixed to the inner surface of each wall, an inlet formed below the internal space surrounded by each wall and connected to the outlet of the air passage, and the left and right ends of the upper wall. It is characterized by a noise prevention device comprising an upper outlet formed between the rear portion and the left and right vertical plates, and a rear outlet formed between the left and right ends of the rear wall and the left and right vertical plates. Noise prevention device for work vehicles.