JPH0312600Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a soundproofing device for a vehicle, such as a soundproofing device for a cargo handling vehicle.

Traditionally, cargo handling vehicles, especially large forklifts,
In a truck, the vehicle body 1 is
Generally, a vehicle is equipped with a diesel engine 2 inside and a driver's cab 3 in the upper part of the vehicle body 1.

In the above configuration, vibrations and noise caused by the diesel engine 2 in the driver's cab 1 have become a serious problem.

The present invention was made to solve the above problems, and aims to provide a device that prevents the above vibrations and noise by using a lead plate with a U-shaped cross section.

The present invention will be described below with reference to FIGS. 2 and 3. The device of the present invention includes a driver's cab 3 whose lower surface is fixed to the upper surface of a frame 4 of a vehicle body 1.
A soundproofing material 5 is provided between the lower surface of the frame 4 and the upper surface of the frame 4.
is inserted, and the soundproofing material 5 has a U-shaped cross section lead plate 6,
The rubber plate 7 is inserted between the upper and lower flanges 6a and 6b of the lead plate 6.

In this embodiment, the soundproofing material 5 is used in the driver's cab 3.
It is not inserted into the entire floor surface of the frame 4, but is inserted only into the part where the frame 4 contacts the upper surface of the constituent channel 8.

Next, to explain the operation, vibrations caused by the diesel engine 2 installed inside the vehicle body 1 are transmitted to the lead plate 6, which is soft and deformable and has a U-shaped cross section, of the soundproofing material 5, and the upper and lower brim 6a, 6b of the lead plate 6. Since the vibration is absorbed by the elastic deformation of the highly elastic rubber plate 7 inserted so as to be sandwiched therebetween, the vibration and its vibration noise are significantly reduced, and the interior of the operator's cab 3 becomes quiet. As shown in FIG. 4, it is also possible to consider an example in which a soundproofing material 5, which is simply a lead plate 6 laminated on a rubber plate 7, is inserted between the lower surface of the driver's cab 3 and the upper surface of the frame 4. Since the outer end of the rubber plate 7 is not covered by the lead plate 6, there is a possibility that some of the internal noise may be transmitted through the rubber plate 7 and leak out of the vehicle.

In contrast, in the present invention, the lead plate 6 is formed with a U-shaped cross section that is open on the inside. The outside wall 6c absorbs and blocks internal noise, reducing leakage of internal noise to the outside of the vehicle. Here, the arrows in FIGS. 3 and 4 indicate the sound transmission path.

As is clear from the above description, according to the present invention, the soundproofing material is composed of a lead plate with a U-shaped cross section that is open on the inside, and a rubber plate inserted between the upper and lower brim of the lead plate. As a result, the vibrations and noise from the engine are absorbed, significantly reducing the vibrations and noise in the driver's cabin, and the internal noise that is trying to escape to the outside of the vehicle through the rubber plate is absorbed by the outer wall of the panel. It has the excellent effect of reducing the leakage of internal noise to the outside of the vehicle by absorbing and blocking it.

[Brief explanation of drawings]

Figure 1 is an overall side view of a forklift truck, Figure 2 is an exploded perspective view of the installation of the driver's cab and frame, Figure 3 is a sectional view of the soundproofing material of the present invention, and Figure 4 is another example of the soundproofing material of the present invention. FIG. 2 is a cross-sectional view of a soundproofing material showing a proposed example. 1...Vehicle body, 3...Driver's cab, 4...Frame,
5... Soundproofing material, 6... Lead plate, 6a, 6b... Tsuba,
7...Rubber plate.

Claims (1)

[Scope of utility model registration request] A driver's cab is provided with a lower surface fixed to the upper surface of a vehicle body frame, and a soundproofing material is inserted between the entire circumference of the lower surface of the driver's cabin and the top surface of the frame, and the soundproofing material has a U-shaped cross section with an open inside. 1. A soundproofing device for a vehicle, comprising a lead plate and a rubber plate inserted so as to be sandwiched between the upper and lower brim of the lead plate.