JP2009190533A - Dash inner silencer structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dash inner silencer structure capable of tightly attaching a dash inner silencer to a dash panel, and insulating panel radiation noise that is generated from the dash panel. <P>SOLUTION: The dash inner silencer 5 is composed of a base plate 5a that is attached to the dash panel 2 for partitioning an engine compartment of an automobile from a cabin and has a rough plate-shape and elasticity, and felt bodies 5b, 5c that are attached to a surface and a back face of the base plate 5a respectively is constituted such that a peripheral part of a bolt insertion hole 5d in the base plate 5a may be formed to be thicker than the other parts, and the noise is insulated by eliminating a clearance between the dash panel 2 and the dash inner silencer 5. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a structure of a dash inner silencer that is disposed on a dash panel that partitions an engine room and a vehicle compartment of an automobile and blocks noise.

  Conventionally, in an automobile in which an engine room is provided either before or after the passenger compartment, a dash panel that defines the engine compartment and the passenger compartment is disposed between the engine compartment and the passenger compartment. As shown in FIG. 6, stud bolts 104 for mounting the dash inner silencer 105 are perpendicular to the plate surface of the dash panel 102 at predetermined positions on the surface on the passenger compartment side near the upper end of the dash panel 102. It is erected. In the figure, Up represents upward and Fr represents forward.

  As shown in FIG. 7, the conventional dash inner silencer 105 includes a thin, substantially plate-like substrate 105a having elasticity, and a felt layer composed of felt bodies 105b and 105c respectively attached to the front and back surfaces of the substrate 105a. Composed. The dash inner silencer 105 is provided with a bolt insertion hole 105 d for receiving the stud bolt 104 at a portion corresponding to the position of the stud bolt 104 erected on the plate surface of the dash panel 102. The dash inner silencer 105 configured as described above is configured such that the stud bolt 104 erected from the plate surface of the dash panel 102 is inserted into the bolt insertion hole 105d so that the stud inner silencer 105 can be attached to the dash panel 102. .

  That is, the conventional dash inner silencer 105 is supported only by friction between the outer peripheral surface of the stud bolt 104 and the inner peripheral surface of the bolt insertion hole 105d of the dash inner silencer 105. Further, since the dash inner silencer 105 between the stud bolts 104 in the vehicle width direction bends due to the elasticity or softness of the dash inner silencer 105, the dash inner silencer 105 and the dash panel 102 are as shown in FIG. A gap was generated and was not necessarily in close contact.

In addition, in the prior art, there is a fixing method in which a dash inner silencer is attached to a stud bolt, and then a nut is screwed and fastened to the stud bolt, but a nut screwing operation is required. A typical example of such a conventional dash inner silencer 105 is given in Patent Document 1.
JP 2007-131149 A

  However, since a gap 110 is formed between the dash panel 102 and the dash inner silencer 105, sound is transmitted through the air in the gap 110 and is transmitted to the passenger compartment side, which causes noise to the passenger. It has been found.

  The present invention was created in view of the above-mentioned problems, and the dash inner silencer is closely connected to the dash panel simply by inserting the bolt insertion hole previously formed in the dash inner silencer into the stud bolt as in the conventional case. It is an object of the present invention to provide a dash inner silencer structure that can be attached and can be effectively insulated.

  In order to achieve the above object, a dash inner silencer structure of the present invention is a dash inner silencer that is attached to a dash panel that partitions an engine room and a vehicle compartment of an automobile and that blocks noise caused by vibration of the dash panel, It consists of a plate-like elastic substrate and a felt layer attached to the front and back surfaces of the substrate, and the substrate and the felt layer receive stud bolts erected substantially perpendicular to the plate surface of the dash panel. The board is characterized in that the peripheral part of the bolt insertion hole is formed thicker than the other parts.

  The thickness of the peripheral portion of the bolt of the substrate is preferably about the thickness of the felt layer attached to the surface of the substrate.

  The bolt insertion hole formed in the substrate preferably has a retaining portion whose hole diameter is narrowed to one end side.

  According to the present invention, in the dash inner silencer, the peripheral portion of the bolt insertion hole drilled in the elastic substrate with the felt layers attached to the front and back surfaces is formed thicker than other substrate surfaces. As a result, the contact area between the inner peripheral surface of the bolt insertion hole and the outer peripheral surface of the stud bolt to be received is increased, and the retaining effect is enhanced. An effect of bringing the silencer into close contact with the dash panel is brought about. Therefore, no additional work such as nut fastening work is required, and the engine system noise and road noise that have come off to the passenger compartment side are blocked by the gap between the dash panel and the dash inner silencer, and the noise reduction effect in the passenger compartment is obtained. It is done.

  Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to FIGS. The dash inner silencer structure 1 of this embodiment is attached to a dash panel 2 that partitions an engine room (not shown) and a vehicle compartment (not shown) of an automobile (not shown), and insulates noise caused by vibration of the dash panel 2. Is for. Note that Up, Fr, and LH in the figure represent the upper, front, and left sides, respectively.

  As shown in FIG. 1, the dash panel 2 has a width extending over the vehicle width, is formed in a substantially rectangular shape having a height extending from the lower end of the front window glass 3 to the lower surface of the vehicle body, and is provided at the front of the vehicle. It is a metal substantially plate-like member disposed between a room and a vehicle room set at the rear of the engine room. As shown in FIG. 2, the upper end of the dash panel 2 has a vertical cross section bent into a mountain shape, and an inclined surface 2a on the front side of the vehicle is formed along the glass surface below the front window glass 3. The side inclined surface 2b is formed to be substantially vertical. A plurality of stud bolts 4 are erected vertically from the plate surface of the dash panel 2 at an appropriate interval in the vehicle width direction on the inclined surface 2b on the mountain-shaped passenger compartment side near the upper end of the dash panel 2. .

  A dash inner silencer 5 is attached to the plate surface of the dash panel 2 on the passenger compartment side downward from an upper position where the stud bolt 4 is erected.

  In the upper part of the engine room, a hood 6 that can freely open and close the upper part of the engine room is disposed. A cowl top garnish 7 extends in the vehicle width direction near the rear end of the hood 6 and near the lower end of the front window glass 3. One end of the cowl upper front panel 8 is fixed to the lower end of the cowl top garnish 7, and the other end is fixed to the vicinity of the upper part of the dash panel 2. The upper part of the dash panel 2, the cowl top garnish 7, and the cowl upper front panel 8. Thus, a cylindrical cowl box 9 extending in the vehicle width direction is formed.

  The dash inner silencer 5 has a three-layer structure in which a felt layer, an elastic layer, and a felt layer are laminated in this order from the passenger compartment side, as shown in FIG. The elastic layer is a substrate 5a made of, for example, vinyl chloride having elasticity. The felt layers attached to the front and back of the substrate 5a are made of felt bodies 5b and 5c having appropriate thickness.

  As shown in FIGS. 3 and 4, a bolt insertion hole 5 d that penetrates the front and back of the dash inner silencer 5 is formed in a portion corresponding to the stud bolt 4 of the dash inner silencer 5. The periphery of the bolt insertion hole 5d portion of the substrate 5a is projected from the surface of the substrate 5a in the shape of a truncated cone, and is thicker than the surface of the substrate 5a. The bolt insertion hole 5d formed in the substrate 5a is formed with a retaining portion 5e in which the hole diameter at the end on the vehicle compartment side is narrowed.

  The thickness of the substrate 5a is set to a constant thickness except for the periphery of the bolt insertion hole 5d. The felt body 5c attached to the surface of the board 5a on the passenger compartment side is set to a thickness corresponding to the upper end from the lower end of the truncated cone portion of the bolt insertion hole 5d, and the periphery of the bolt insertion hole 5d is the cone of the board 5a. It is formed in an inverted truncated cone shape corresponding to a trapezoid. The felt body 5b attached to the surface of the substrate 5a on the dash panel 2 side is set to an appropriate constant thickness.

  The dash inner silencer 5 of the present embodiment is thickened by forming the peripheral portion of the bolt insertion hole 5d of the elastic substrate 5a in a truncated cone shape as shown in FIG. The retaining portion 5e that increases the contact area between the outer peripheral surface of the stud bolt 4 and the inner peripheral surface of the bolt insertion hole 5d and constricts the inner diameter of one end of the bolt insertion hole 5d to a small diameter, thereby exhibiting a retaining effect. By being formed, it is possible to easily attach the dash panel 2 to the dash panel 2 and to prevent the stud bolt 4 from coming off from the bolt insertion hole 5d or play due to vibration.

  Therefore, even if the stud bolt 4 is not screwed with a nut or the like and fastened to the dash panel 2, the bolt insertion hole 5d is difficult to be removed from the stud bolt 4, and a stable mounting state can be maintained. In addition, a gap is not generated between the bolt insertion hole 5d and the stud bolt 4, and the dash inner silencer 5 can be brought into close contact with the dash panel 2 by the support effect. . Therefore, a gap is not formed between the dash inner silencer 5 and the dash panel 2, and noise caused by vibration of the dash panel 2 that has entered the vehicle compartment can be sounded and reduced by passing through this gap.

  As described above, in the dash inner silencer 5 of the present invention, the peripheral portion of the bolt insertion hole 5d of the dash inner silencer 5 is formed thicker than the other portions of the substrate 5a, and the stud bolt of the dash panel 2 is formed. By increasing the contact area between the outer peripheral surface of 4 and the inner peripheral surface of the bolt insertion hole 5d of the dash inner silencer 5, the closeness of the dash inner silencer 5 to the dash panel 2 can be improved. The noise due to the vibration of the panel 2 is insulated and reduced, and can be implemented in various forms without departing from the gist thereof.

It is the figure seen from the vehicle front which shows the arrangement | positioning state of the dash panel of this embodiment. It is an enlarged view of the partial cross section of FIG. 1A which shows the structure of the dash inner silencer of this embodiment. It is an enlarged view of the B section of FIG. It is a figure which shows the state before the assembly | attachment of the stud bolt of the dash panel shown in FIG. 3, and the bolt insertion hole part of a dash inner silencer. It is a figure which shows the expanded cross section of FIG. 2C view. It is an expanded sectional view near the upper end part of a dash panel which shows the composition of the conventional dash inner silencer. It is an enlarged view of the D section of FIG. It is a figure which shows the expanded cross section of FIG. 6E view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Dash inner silencer structure 2 Dash panel 2a Vehicle front side inclined surface 2b Vehicle rear side inclined surface 3 Front window glass 4 Stud bolt 5 Dash inner silencer 5a Substrate 5b Felt body 5c Felt body 5d Bolt insertion hole 5e Retaining part 6 Hood 7 Cowl top garnish 8 Cowl upper front panel 9 Cowl box 102 Dash panel 104 Stud bolt 105 Dash inner silencer 105a Substrate 105b Felt body 105c Felt body 105d Bolt insertion hole 110 Gap

Claims (3)

A dash inner silencer that is attached to a dash panel that partitions an engine room and a vehicle compartment of an automobile, and that blocks noise caused by vibration of the dash panel,
It consists of a substrate having a substantially plate-like elasticity, and a felt layer attached to the front and back surfaces of the substrate,
The substrate and the felt layer have bolt insertion holes for receiving bolts that are erected substantially perpendicular to the plate surface of the dash panel,
The dash inner silencer structure, wherein the board has a peripheral portion of the bolt insertion hole formed thicker than other portions.   2. The dash inner silencer structure according to claim 1, wherein the thickness of the peripheral portion of the bolt of the substrate is about the thickness of a felt layer attached to the surface of the substrate.   3. The dash inner silencer structure according to claim 1, wherein the bolt insertion hole formed in the substrate has a retaining portion whose hole diameter is narrowed to a small diameter on one end side. 4.