JPH08135532A - Intake noise reducing device - Google Patents

Abstract

PURPOSE: To facilitate production and reduce cost by installing a suction port on the upper part of a rear pipe of a head guard installed erectedly at the rear of a body, installing an exhaust port on the lower part of it, and also installing a silencer interconnected to the exhaust port integrally inside the body at a position located at the upper part of a rear tire. CONSTITUTION: An intake noise reducing device l applied to a load handling vehicle such as an engine fork lift, etc., is installed erectedly at the rear of a body 2, and utilizes a rear pipe 3 which constitutes a head guard 16 in which a path 15 is formed. Also a suction port 4 interconnected to the path 15 is formed on the upper part of the rear pipe 3, and an exhaust port 5 interconnected to the path is formed on the lower part of it. Then a silencer 6 is provided integrally inside the body 2 at a position located on the upper side of a rear tire 12, and interconnected to the exhaust port 15. In addition, an air cleaner 7 is installed by interconnecting it with the silencer 6, its inlet is connected to the outlet of the silencer 6 through a conduit 19, and its outlet is connected to an engine 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of an intake noise reduction device applied to an engine type cargo handling vehicle such as a forklift truck.

[0002]

2. Description of the Related Art Conventionally, as this type of intake noise reducing device, for example, Japanese Utility Model Publication No. 61-176021, Japanese Utility Model Publication No. 62-119393 and Japanese Utility Model Publication No. 62-120025 are available.
Those described in Japanese Patent Publications and the like are known. The intake noise reduction device is basically a vehicle body, a rear pipe of a head guard that is erected on the rear side of the vehicle body and has a passage formed therein, and an intake port that is provided above the rear pipe and communicates with the passage. And a discharge port that is provided below the rear pipe and communicates with the passage, an air cleaner that communicates with the discharge port, and a muffler provided inside the rear pipe. However, since a muffler is provided inside the rear pipe of the head guard, such a device is complicated and costly to manufacture.

[0003]

SUMMARY OF THE INVENTION The present invention was devised to solve the above problems in view of the above problems, and the purpose thereof is to facilitate the production and reduce the cost. An object is to provide a device for reducing intake noise.

[0004]

SUMMARY OF THE INVENTION An intake noise reduction device of the present invention basically comprises a vehicle body, a rear pipe of a head guard which is erected on the rear side of the vehicle body and has a passage formed therein, and a rear pipe. An inlet provided at the top and communicating with the passage,
An exhaust port provided at a lower portion of the rear pipe and communicating with the passage, a silencer integrally provided inside the vehicle body located above the rear tire and communicated with the exhaust port, and an air cleaner communicated with the silencer, The feature is that it is composed of.

[0005]

[Function] Outside air is sucked into the intake port → passageway → exhaust port → silencer → air cleaner → engine. The intake sound is discharged in the reverse order of engine → air cleaner → silencer → exhaust port → passage → intake port. At this time, the suction noise is reduced by the muffler. Since the muffler is integrally provided inside the vehicle body located above the rear tire, it is easy to manufacture and the cost can be reduced.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a vertical sectional side view showing an intake noise reduction device according to a first embodiment of the present invention. FIG. 2 is a longitudinal rear view of FIG. The intake noise reduction device 1 includes a vehicle body 2, a rear pipe 3,
The intake port 4, the discharge port 5, the muffler 6, and the air cleaner 7 constitute the main part, and in this example, it is applied to an engine type forklift. The vehicle body 2 forms a basic part of the intake noise reduction device 1. In this example, the vehicle body 2 is composed of left and right side plates 8 having a substantially C-shaped cross section, and an appropriate connecting member 9 for connecting them. Are tanks that utilize these (fuel tank on the left and hydraulic oil tank on the right)
10 are formed. Inside the vehicle body 2 is an engine 11
However, a front tire and a cargo handling device (neither shown) are provided on the front side, and a rear tire 12 and a counterweight 1 are provided on the rear side.
3 and bonnets 14 are provided on the upper rear side. A space S is formed inside each side plate 8 of the vehicle body 2 located behind each tank 10 and above each rear tire 12 to form a so-called dead space. The rear pipe 3
The head guard 16 is provided upright on the rear side of the vehicle body 2 and has a passage 15 formed therein. In this example, the head guard 16 has a square pipe shape and the passage 15 is formed inside. The head card 16 includes left and right front pipes (not shown) that are erected on the front side of the vehicle body 2, left and right rear pipes 3 that are erected on the rear side of the vehicle body 2, and a top frame body provided above them. 17
And consists of. The suction port 4 is provided above the rear pipe 3 and communicates with the passage 15. In this example, the suction port 4 is formed on the upper right side of the right rear pipe 3. The discharge port 5 is provided below the rear pipe 3 and communicates with the passage 15. In this example, the discharge port 5 is formed below the lower rear pipe 3 on the right side. The muffler 6 is integrally provided inside the vehicle body 2 located above the rear tire 12 and communicates with the discharge port 5. In this example, the muffler 6 is formed in the space S on the right side to reduce pulsating noise. It is a resonator (expansion room). That is, the muffler 6 has a box-like shape having front, rear, left, right, upper, and lower walls and an entrance formed in the upper wall. 10 rear plates are used respectively, and the inlet is connected to the discharge port 5 by the communication pipe 18. The air cleaner 7 is communicated with the silencer 6, and in this example, the inlet is connected to the outlet of the silencer 6 by the conduit 19 and the outlet is connected to the engine 11.

Next, the operation will be described based on such a configuration. The outside air is sucked into the suction port 4, the passage 15, the discharge port 5, the silencer 6, the air cleaner 7, and the engine 11. The intake sound is discharged in the reverse order of engine 11 → air cleaner 7 → silencer 6 → exhaust port 5 → passage 15 → intake port 4. At this time, a suction sound (pulsation sound) is generated by the muffler (resonator) 6.
Is reduced. Since the muffler 6 is integrally provided inside the side plate 8 of the vehicle body 2 located behind the tank 10 and above the rear tire 12, it can be produced simultaneously with the vehicle body 2 and is easy to produce and at a low cost. It can be reduced.

Next, a second embodiment of the present invention will be described with reference to FIG. In the second embodiment, the discharge port 5 is connected to the rear pipe 3
3 is different from the first embodiment in that it is formed in the lower part of the above, that it is directly connected to the outlet 5 and the inlet of the silencer 6, and that the communication pipe 18 is omitted. By doing so, the structure is simplified and piping is facilitated by the amount that the communication pipe 18 is omitted.

Although the suction port 4, the discharge port 5, and the muffler 6 are provided on the right side in the above-mentioned embodiment, the invention is not limited to this and may be provided on the left side, for example.

[0010]

As described above, according to the present invention,
The following excellent effects can be achieved. (1) Car body, rear pipe, inlet, outlet, silencer,
Since it is composed of an air cleaner, and in particular, the silencer is integrally provided inside the vehicle body located above the rear tire, the manufacture is easy and the cost can be reduced. (2) Since the silencer is integrally provided inside the vehicle body located above the rear tire, the strength of the vehicle body can be improved.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing an intake noise reduction device according to a first embodiment of the present invention.

FIG. 2 is a vertical sectional rear view of FIG.

FIG. 3 is a view similar to FIG. 2 showing a second embodiment of the present invention.

[Explanation of symbols]

1 ... Intake noise reduction device, 2 ... Car body, 3 ... Rear pipe, 4
... Intake port, 5 ... Exhaust port, 6 ... Silencer, 7 ... Air cleaner, 8 ... Side plate, 9 ... Connecting material, 10 ... Tank, 11 ... Engine, 12 ... Rear tire, 13 ... Counterweight, 1
4 ... Bonnet, 15 ... Passage, 16 ... Head guard, 1
7 ... Top frame, 18 ... Communication pipe, 19 ... Conduit, S ... Space.

Claims (1)

[Claims] 1. A vehicle body, a rear pipe of a head guard standing upright on the rear side of the vehicle body and having a passage formed therein, an intake port provided above the rear pipe and communicating with the passage, and provided below the rear pipe. The exhaust port connected to the passage, the silencer integrally provided inside the vehicle body above the rear tire and connected to the exhaust port, and the air cleaner communicated to the silencer. Characteristic intake noise reduction device.