JPS595621Y2 - Noise prevention device for industrial vehicles - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a noise prevention device for reducing noise from the rear of an industrial vehicle such as a forklift.

Generally, in the case of a forklift, an engine room is provided in the center of the vehicle body, and hot air within the engine room is released outside through an opening provided in a weight at the rear of the vehicle body.

Therefore, the noise generated in the engine room during vehicle operation from the engine, valve train, fan, etc. is emitted to the outside through the opening, causing noise pollution not only to the driver but also to surrounding workers. Become.

For this reason, various noise prevention measures have been taken in the past, but conventional noise prevention devices have the problem of easily causing engine overheating.

The present invention has been made in view of the above-mentioned conventional problems, and aims to provide a noise prevention device for industrial vehicles that can reduce noise without causing engine overheating.

Hereinafter, illustrated embodiments embodying the present invention will be described in detail.

This example is applied to a forklift, and the first
As shown in the figure, an engine 3, a cooling fan 4, a radiator 5, etc. are housed in an engine room 2 formed approximately in the center of the vehicle body 1, and a weight 6 provided at the rear of the vehicle body is installed. An opening 7 is provided through the engine room 2 to release hot air from the engine room 2 to the outside.

As shown in FIGS. 1 to 4, in a forklift truck having the above-mentioned body structure, a plurality of strip-shaped weights are attached to the front surface of the weight 6 that constitutes the rear wall surface of the engine compartment 2. A soundproof board 8 is suspended like a curtain with a suitable gap (or no gap) so as to close the entrance of the opening 7.

That is, the sound insulating board 8 is constructed by pasting together a sound absorbing material 9 made of felt and a sound insulating material 10 made of rubber, and providing a large number of small holes 11 therein. The upper end of the hanging rod 12 is fixed to the hanging rod 12 while facing the weight 6, and both ends of the hanging rod 12 are rotated seven times via a pusher 15 by a bracket 14 fixed to the upper front surface of the weight 6 with a bolt 13. Possibly supported.

On the other hand, a cover 18 is attached to the rear end of the engine hood 16 that covers the upper part of the engine room 2 to form an escape port 17 for dispersing noise air over the entire width of the engine room 2. The cover 18 is sloped so as to guide noise air obliquely upward, and a sound absorbing material 19 is adhered to the sloped inner surface.

Note that the force bar 18 may be formed integrally with the engine hood 16.

The noise prevention device of this embodiment is constructed as described above, and therefore, the noisy air as indicated by the arrow in the figure, which is blown out by the cooling fan 4 as the engine 3 is driven, flows through the opening 7.
By colliding with the soundproof board 8 suspended at the entrance of
As a result of the sound being absorbed by the sound absorbing material 9 and being insulated by the sound insulating material 10,
The noise emitted into the atmosphere will be significantly reduced.

However, when the engine speed is low and the wind force generated by the cooling fan 4 is weak, such as when the engine is idling, the noisy air is emitted through the gaps between the soundproof plates 8 or through the small holes 11, as well as from the upper part of the engine hood 16. Escape shaped into 1
In this case, the noisy air collides with the sound-absorbing material 19 on the inner surface of the cover 18 and is absorbed, as shown by the arrow in the figure. released diffusely.

Further, when the wind force of the noisy air blown out by the cooling fan 4 is large during high-speed operation of the engine, the soundproof plate 8 is rotated rearward together with the hanging rod 12 to a position corresponding to the magnitude of the wind force. Allow air flow.

That is, according to this device, the noise emitted to the outside from the engine room 2 can be reduced without impairing the cooling effect in the engine room 2, regardless of the speed of the engine.

Note that the vent 17 in the above embodiment can be omitted if the soundproof plate 8 is set to respond even to weak wind force such as during idling.

Next, another embodiment of the soundproof board 8 of the present invention will be described.

In the example shown in FIG. 5, a locking hook 20 made of a leaf spring is provided at the upper end of the soundproof board 8, and the soundproof board 8 is attached to the hanging rod 12 using this locking hook 20. Therefore, the soundproof board 8 can be easily attached and removed, and replacement work can be easily carried out when the soundproof board 8 is damaged by heat.

Further, in the example shown in FIG. 6, each sound insulation board 8 is attached to the upper end of the sound insulation board 8 through a cylinder part 21 so as to be individually rotationally displaced with respect to the hanging rod 12, and furthermore, in the example shown in FIG. The example shown in
A notch 18a of an appropriate length is provided in the lower part of a single board, and the lower part is made into a soundproof board 8 that can be independently displaced.

Furthermore, although not shown in the drawings, by adding appropriate flexibility to the soundproofing board 8 itself, it is possible to configure it so that it responds to the wind force of the noisy air by its own deflection displacement. In this case, the upper end of the soundproof plate 8 can be directly fixed to the front surface of the weight 6 with bolts or the like, which further simplifies the structure.

As detailed above, the present invention is a sound insulating board formed by superimposing sound absorbing material and sound insulating material for use in industrial vehicles in which air in the engine room is released to the outside through an opening provided at the rear of the vehicle body. are suspended from the opening so as to be displaced independently according to the wind force of the noisy air flowing through the opening. Therefore, according to the present invention, the cooling effect of the engine room is not hindered. After solving the problem of engine overheating, it is possible to exhibit an effective noise prevention effect.

Further, since the device of the present invention has a simple structure, it is easy to assemble and maintain, and has the advantage that it can be easily installed in existing vehicles without any special processing.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; Fig. 1 is a partially sectional side view of a forklift equipped with this device, Fig. 2 is a perspective view showing the main parts, Fig. 3 is a front view showing a soundproof plate, and Fig. Figure 4 is the third
The sectional view taken along the line IV-TV in the figure and FIGS. 5 to 7 are explanatory diagrams showing other embodiments of the soundproof board. 1... Vehicle body, 2... Engine room,
6... Weight, 7... Opening, 8.
...Soundproofing board, 9...Sound absorbing material, 10...
...Sound insulation material, 12...Hanging rod.

Claims (1)

[Scope of utility model registration request] A plurality of soundproof boards made by bonding sound-absorbing and sound-insulating materials are attached to an opening cut through the rear of the car body so as to communicate with the engine room, each of which is installed independently in response to the wind force flowing through the opening. A noise prevention device for an industrial vehicle, characterized by being suspended so as to be displaced.