JPH04349081A - Sound insulating and vibration suppressing structure of car - Google Patents

Abstract

PURPOSE:To enhance the effect of shutting the transmissive sound and effect of suppressing vibration by applying a sound-insulating and vibro-suppressing structure to the dash panel of a car, and therewith preventing generation of void in an asphalt sheet layer. CONSTITUTION:An asphalt sheet layer 4 is put fully between a pair of panels 5, 6 having projecting and recessed parts to form a dash panel 1. The asphalt sheet layer 4 is constructed by arranging sub-asphalt sheet 8 and main asphalt sheet 7 made of a foaming material between the two panels 5, 6 in such a way that the inner surfaces of the convex and concave parts are covered and a gap (t) stretching across the thickness having an approx. constant thickness is provided between each asphalt sheet 7, 8 and the panels 5, 6, and by heating this to a certain temp., the asphalt sheets 7, 8 are allowed to foam so as to fill the gap (t).

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a soundproofing and vibration damping structure for a vehicle to isolate noise and vibration, and in particular, when a wall material is constructed by filling a layer of asphalt sheet between a pair of panels, it is possible to The effect of blocking transmitted sound by preventing the occurrence of
The present invention also relates to improvements in the structure of wall materials that can improve vibration suppression effects.

0002

[Prior Art] For example, soundproofing and vibration-damping wall materials are used in dash panels and floor panels that separate the engine compartment and passenger compartment of automobiles to prevent noise and vibrations from being transmitted into the passenger compartment. It has a structure in which soundproofing and vibration damping material is filled between a pair of panels made of steel plates. In addition, the above soundproofing and vibration damping materials are inexpensive, soundproofing,
An asphalt sheet layer with a high vibration-damping effect is adopted, and soundproofing and vibration-damping wall materials using this asphalt sheet layer were proposed in Utility Model Application Publication No. 63-50755 and Utility Model Application Publication No. 63-95978. There are things that have been done. When manufacturing soundproofing and damping wall materials using such an asphalt sheet layer, conventionally, the methods shown in FIGS. 6 and 7 are generally employed. This is achieved by disposing an asphalt sheet 22 made of a flat foam material between an outer panel 20 and an inner panel 21, and
The asphalt sheet 22 is sandwiched between the layers and foamed to form the asphalt sheet layer 22.
′ is formed. Here, if both the panels 20, 21 have cup-shaped protrusions 23, if the asphalt sheet 22 is sandwiched as is, the panels will easily deform or float due to poor followability. Therefore, conventionally, the above asphalt sheet 2
A large number of slits 24 are formed in portions corresponding to the two convex portions 23.

0003

[Problems to be Solved by the Invention] However, in the conventional soundproofing and damping wall material using the asphalt sheet 22, as shown in FIG. A problem arises in that a space 25 is likely to be formed at the corner portion where the transmission occurs, and as a result, the effect of blocking transmitted sound and the effect of suppressing vibration are reduced. This is considered to be because the volume of the asphalt sheet 22 does not increase much in the plane direction even if it is foamed.

The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide a sound insulation and vibration damping structure for a vehicle that can improve sound insulation and vibration damping effects by eliminating the space in the asphalt sheet. It is said that

[0005]

[Means for Solving the Problems] Therefore, the present invention provides a soundproofing and vibration damping structure for a vehicle in which an asphalt sheet layer is filled between a pair of panels having uneven parts, in which the asphalt sheet layer is made of a foam material. A main asphalt sheet and a sub-asphalt sheet are arranged between the above two panels so as to cover the inner surface of one of the panels and leave a gap in the thickness direction between the inner surface of the other panel, and in this state The main asphalt sheet and the sub-asphalt sheet are foamed to fill the gap. Here, arranging the main and sub asphalt sheets so as to cover one panel and leaving a gap between them and the other panel means, for example, as shown in FIG. Part 3 of inner panel 3
a, and is arranged so that a gap t is created between the sheet portion 7a and the part 2a of the outer panel 2, and a sub-asphalt sheet is used to cover the part 2b of the outer panel 2 with its sheet portion 8b, and , which means that the sheet portion 8b and the part 3b of the inner panel 3 are arranged so that a gap t is formed between them.

[0006]

[Operation] In manufacturing the wall material of the soundproofing and vibration damping structure according to the present invention, the foamed main and sub-asphalt sheets are covered on the inner surface of either one of the panels, and a thickness is Arrange so that there is a gap in the direction. When both asphalt sheets are heated, the asphalt sheet expands in the thickness direction, and the gap is filled with the volume increase in the thickness direction during foaming. Shaking wall material is obtained. As a result, the conventional space can be eliminated, and the effect of blocking transmitted sound and suppressing vibration can be improved accordingly.

[0007]

Embodiments Hereinafter, embodiments of the present invention will be explained with reference to the drawings. 1 to 5 are diagrams for explaining a soundproofing and vibration damping structure according to an embodiment of the present invention. In this embodiment, the case where the structure is applied to a dash panel of an automobile will be explained as an example.

In the figure, reference numeral 1 is a dash panel that separates the engine room and the passenger compartment, and this is assembled by spot welding an outer panel 2 and an inner panel 3 made of steel plates, and an asphalt sheet is placed between both panels 2 and 3. It is constructed by filling the layer 4 without any gaps. The outer panel 2 and the inner panel 3 are respectively formed with cup-shaped protrusions 5 and 6 that bulge outward, and the protrusion 6 of the inner panel 3 corresponds to the protrusion 5 of the outer panel 2.
Located within. This cup portion is also filled with the asphalt sheet layer 4 without any gaps.

The asphalt sheet layer 4 is formed by foaming a main asphalt sheet 7 and a sub-asphalt sheet 8 made of a foamable material, and is manufactured by the following procedure.

[0010] An outer panel 2 and an inner panel 3 are formed by press working, and a main asphalt sheet 7 and a sub-asphalt sheet 8 are arranged between the two panels 2 and 3 (see FIG. 1). Here, the main asphalt sheet 7 has a large number of radially extending slits 9 formed in portions thereof corresponding to the convex portions 6 (Fig. 3
reference). Further, the sub-asphalt sheet 8 is a chrysanthemum-shaped sheet formed by integrally forming a triangular sheet portion 8b extending radially around the outer periphery of a circular portion 8a (see FIG. 2). First, the slit 9 portion of the main asphalt sheet 7 is fitted into the convex portion 6 of the inner panel 3, and each sheet portion 7a of the main asphalt sheet 7 is placed over the outer peripheral wall 6a of the convex portion 6. As a result, the triangular sheet portion 7a surrounds the outer peripheral wall 6a of the convex portion 6 of the inner panel 3. Next, cover the sub-asphalt sheet 8 so that its circular part 8a is located on the outer bottom surface 6b of the convex part 6, and each sheet part 8b is located as much as possible between each sheet part 7a of the outer peripheral wall 6a (
(See Figure 4). As a result, the circular portion 8a covers the outer bottom surface 6b of the convex portion 6 of the inner panel 3, and each sheet portion 8b covers the portion between the sheet portions 7a of the outer peripheral wall 6a. In this case, the sheet portion 8b of the sub-asphalt sheet 8 and the sheet portion 7a of the main asphalt sheet 7 may overlap to some extent. Next, each asphalt sheet 7, 8 is sandwiched between both panels 2, 3 so that the convex part 6 of the inner panel 3 is located within the convex part 5 of the outer panel 2, and both panels 2, 3 are spot welded together. Join by. As a result, the above outer panel 2
, the inner surface of the inner panel 3 is covered with a main asphalt sheet 7 and a sub-asphalt sheet 8. Further, a certain gap t is provided between the sheet portion 7a of the main asphalt sheet 7 and the outer panel 2, and a certain gap t is provided between the sheet portion 8b of the sub-asphalt sheet 8.
A certain gap t is provided between the gap and the inner panel 3 (see FIG. 1(b) and FIG. 5). This gap t is approximately the same as the thickness of each of the asphalt sheets 7 and 8.

[0011]Then, the above-mentioned dash panel 1 is placed on the left side,
Attach to the vehicle body by spot welding both right ends to the left and right inner surfaces of the vehicle body. Next, the dash panel 1 is heated in a car body paint baking process. This baking step is carried out at a temperature of approximately 170° C., which is above the foaming temperature of the sheet. Therefore, in this step, the asphalt sheets 7 and 8 are foamed and expanded in the thickness direction, and the gap t is filled by the increase in volume during foaming. As a result, the asphalt sheet layer 4 is filled over the entire surface between the panels 2 and 3 without any gaps (see FIG. 1(c)).

[0012] According to this embodiment, the foamed main asphalt sheet 7 and sub-asphalt sheet 8 are used, and these asphalt sheets 7 and 8 are combined to cover the surface of the convex portion 6 of the inner panel 3. At the same time, since a predetermined gap t was provided between the two and the asphalt sheets 7 and 8 were heated and foamed, the gap t could be completely filled by the expansion of the asphalt sheets 7 and 8, and both panels The asphalt sheet layer 4 can be filled over the entire surface between two and three, and as a result, the effect of blocking transmitted sound and suppressing vibration can be improved. Further, in this embodiment, since the above-mentioned asphalt sheets 7 and 8 can be heated at the same time in the painting baking process, an increase in cost can be suppressed. In addition, in the above embodiment, the case where it is applied to a dash panel was explained as an example, but the soundproofing and the soundproofing of the present invention
The scope of application of the vibration damping wall material is of course not limited to this, and it can be widely used as a wall material for suppressing noise and vibration in automobiles.

[0013]

[Effects of the Invention] As described above, the soundproofing of a vehicle according to the present invention,
According to the vibration damping structure, a main asphalt sheet and a sub-asphalt sheet made of a foam material are arranged so as to cover the uneven parts between both panels, with a substantially constant gap between them, Since the asphalt sheet and the sub-asphalt sheet are foamed to fill the above-mentioned gaps, the asphalt sheet layer can be filled over the entire surface between the two panels without any gaps, and the effect of suppressing noise and vibration can be improved.

[Brief explanation of drawings]

FIG. 1 is a process diagram showing a method for manufacturing a dash panel (soundproofing and damping wall material) according to an embodiment of the present invention.

FIG. 2 is a plan view showing the sub-asphalt sheet of the above embodiment.

FIG. 3 is a plan view showing slits formed in the main asphalt sheet of the above embodiment.

FIG. 4 is an exploded perspective view showing a state in which a main asphalt sheet and a sub-asphalt sheet are attached to the convex portion of the inner panel of the above embodiment.

FIG. 5 is a sectional view taken along line V-V in FIG. 1(b).

FIG. 6 is a process diagram showing a conventional method of manufacturing a soundproofing and damping wall material.

FIG. 7 is a perspective view showing a conventional asphalt sheet.

[Explanation of symbols] 1 Dash panel (soundproofing, damping wall material) 2 Outer panel 3 Inner panel 4 Asphalt sheet layer 5 Convex portion of outer panel 6 Convex portion of inner panel 7 Main asphalt sheet 8 Sub-asphalt sheet t Gap

Claims (1)

[Claims] In a vehicle soundproofing and vibration damping structure in which an asphalt sheet layer is filled between a pair of panels having uneven parts, the asphalt sheet layer has a main asphalt sheet and a sub-asphalt sheet made of a foamable material between the two panels. The main asphalt sheet and the sub-asphalt sheet are foamed in such a manner that the inner surface of one of the panels is covered and a gap is created in the thickness direction between the inner surface of the other panel and the inner surface of the other panel. A soundproof and vibration damping structure for a vehicle characterized by being constructed by filling gaps.