JPS5849851Y2 - Noise reduction device for tilt-type vehicles - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a noise reduction device for a tilt-type cab vehicle.

Conventionally, as a countermeasure to the noise generated by engines, etc., a method has been proposed to surround the engine with a sound insulating wall.
For example, in the case of a tilt-cab vehicle, the cab is tilted forward for engine maintenance and inspection, so the sound insulation walls installed on the sides and rear of the engine are the upper sound insulation board on the cab side and the frame. It needs to be divided into the lower side and the sound insulation board.

A conventional example will be explained with reference to FIGS. 1 and 2. Reference numeral 1 indicates a tilt-type cab, 2 a frame, and 3 a cab floor.

Reference numeral 4 denotes an upper sound insulation plate, which is fixed to the lower surface of the cab floor 3, and 4a represents an upper sound insulation part.

5 is a lower sound insulating plate that covers the sides and rear of the engine 6 (FIG. 2) and is fixed to the frame 2, and 5a is a lower sound insulating part.

The details of the sound insulation parts 4a and 5a are as shown in FIG.
c and a U-shaped groove 5d is formed.

5eid This is a hole for draining water formed in the sound insulation part 5a.

In the sound insulation part 4a, an inverted U-shaped groove 4d is formed by the lower end 4b of the upper sound insulation plate 4 and the upper sound insulation material 4c, and as shown in the figure, the sound insulation parts 4a and 5a have a gap between them. They are separated and regrouped.

According to the conventional example, when the cab 1 is in the normal position, a multi-layered sound insulating wall is formed by the sound insulating parts 4a and 5a, and the noise generated from the engine etc. is prevented from leaking to the outside due to the silencer action of the multi-layered sound insulating wall. However, since the grooves 4d and 5d of the upper sound insulation part 4a and the lower sound insulation part 5a extend continuously in the longitudinal direction, the noise from the engine, etc. is spread out in the longitudinal direction of these grooves. However, the problem was that the sound insulation effect was not sufficient.

The present invention was devised to eliminate the drawbacks of the prior art described above, and its purpose is to provide a sufficient sound insulation effect against noise generated from engines etc. To provide a vehicle noise reduction device that does not deform, has good ventilation between the inside and outside of an engine room, and has an excellent heat dissipation property.

In short, the present invention provides a plurality of partition plates in the groove of one sound insulation part to divide the groove in the longitudinal direction, and provides a plurality of relief grooves for the partition plates in the other sound insulation part, and also provides a plurality of relief grooves for dividing the groove in the longitudinal direction. The device is characterized in that at least one surface of the section is covered with a sound absorbing material.

The present invention will be explained below based on embodiments shown in the drawings.

In Figure 3, 7 is a tilt cab, 8 is a frame,
9 is the cab floor.

Reference numeral 10 denotes an upper sound insulation plate, which is fixed to the lower surface of the cab floor 9, and 9.10a represents a sound insulation part.

11 is a lower sound insulating plate that covers the sides and rear of the engine 12 (FIG. 4) and is fixed to the frame 8, and 11a is a lower sound insulating part.

The details of the sound insulation parts 10a and 11a are as shown in FIG. 4 and FIG.
An upper sound insulating material 10c and a sound insulating member 10e having an inverted U-shaped groove 10d are fixed to the upper sound insulating material 10c, and the sound insulating member 10e includes the lower end 10b of the upper sound insulating plate 10, the upper sound insulating material 10c, and the outer wall of the sound insulating member 10e. A plurality of partition plates 10g and 10h are provided in the longitudinally continuous groove 10f and the similar groove 10d of the sound insulating member 10e, respectively, to divide these grooves in the longitudinal direction.
are arranged alternately in the longitudinal direction, as shown in FIG.

Further, the sound insulation part 11a includes an upper end portion 11b of the lower sound insulation plate 11.
A lower sound insulating member 11c and a sound insulating member 11e having a U-shaped longitudinally continuous groove 11d are fixed to the lower sound insulating member 11e, and a partition plate 10g of the upper sound insulating part 10a is attached to the lower sound insulating member 11e.
A plurality of relief grooves 11f for each of the grooves 10h and 10h are formed along the longitudinal direction, as shown in FIG.

Further, the surface of at least one of the sound insulation parts 10a and 11a is covered with a sound absorbing material AM that is welded or the like.

Moreover, these sound insulation parts may have the partition plates 10g and 10h as lower sound insulation parts, and the groove parts 11f side as upper sound insulation parts.

Furthermore, the configurations of the sound insulation parts 10a and 11a can be modified in various ways in addition to the configurations shown in FIGS. 4 and 5. One example is the configuration shown in FIGS. 6 and 7. , and by turning the sound insulating member 10'e with the open side of the member having an E-shaped cross section facing downward, the shapes shown in FIGS. 4 and 5 can be obtained.
The sound insulating material 10c shown in the figure can also serve as the sound insulating member 10e.

In addition, in FIGS. 6 and 7, the same parts and parts as in the embodiment shown in FIGS. 4 and 5 are given the same reference numerals.
The illustration of the sound absorbing material is omitted.

The present invention is constructed as described above, and its operation will be explained below.

When the cab 7 is in the normal position, a multi-layered sound insulating wall is formed by the sound insulating parts 10a or 10'a and 11a, and the noise generated from the engine etc. is reduced by the silencer action of these multi-layered sound insulating walls.
and 10h or 10'g and 1σh, the noise is prevented from spreading in the longitudinal direction, and these sound insulation parts 1
Noise is absorbed by the action of the sound absorbing material AM, which covers the surface of at least one of the sound insulation parts of 0a or 10'a and 11a by welding or the like, and a sufficient sound insulation effect is obtained. Since the sound insulating parts 10 are arranged in a non-contact state with
a and 11a are not deformed, good ventilation between the inside and outside of the engine room is maintained, and heat dissipation is also improved.

Since the present invention is constructed and operates as described above, it is possible to obtain a sufficient sound insulation effect against the noise generated from the engine, etc., and the sound insulation part is not deformed by vibration or other factors, and the engine Good ventilation between the inside and outside of the room is maintained, and a number of significant effects such as favorable heat dissipation and cooling of the engine can be obtained.

[Brief explanation of the drawing]

Figures 1 and 2 relate to a conventional example; Figure 1 is a side view showing the tilted state of a tilt-type cab vehicle; Figure 2 is a cross-sectional view of the main part of the sound insulation plate in normal operation, taken in the direction of arrow A in Figure 1; , Figure 3~
Fig. 7 shows an embodiment of the present invention, Fig. 3 is a side view showing the tilted state of a tilt-type cab vehicle, and Fig. 4 shows the main part of the sound insulation board that can be pressed in normal conditions, as viewed from arrow B in Fig. 3. 5 is a perspective view of the sound insulation part in a tilted state, FIG. 6 is a diagram corresponding to FIG. 4 regarding an embodiment different from that shown in FIG. 5, and FIG. 7 is a diagram corresponding to FIG. FIG. 3 is a perspective view of the sound insulation part of the example shown in FIG. 8 is the frame, 9 is the cab floor, 10 is the upper sound insulation board,
10a, 11a, 10'a are sound insulation parts, 10g. 10h, 10'g, and 10'h are partition plates, 11 is a lower sound insulating plate, 11f is an escape groove, 12 is an engine, and AM is a sound absorbing material.

Claims (1)

[Scope of utility model registration request] A lower sound insulating board is installed on the frame of the tilt-type cab vehicle to cover the sides and rear of the engine, and the lower surface of the cab floor is
An upper sound insulating board facing the lower sound insulating board is fixed to the lower sound insulating board, and a sound insulating part is provided at the opposing part of the lower sound insulating board and the upper sound insulating board with a gap therebetween, and one side A groove is provided in the sound insulation part of the groove, and a plurality of partition plates are provided in the groove to divide the groove in the longitudinal direction, and a plurality of relief grooves for the partition plates are provided in the other sound insulation part. A noise reduction device for a tilt-type cab vehicle, characterized in that at least one surface of the vehicle is coated with a sound-absorbing material.