JPS593137B2 - How to make double soundproof walls for vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a double soundproof wall that can prevent the noise and vibrations of an automobile engine from propagating into the interior of a vehicle or outside the vehicle, particularly a soundproof wall for a car's dashboard panel or a truck's engine room. The present invention relates to a method for manufacturing a double soundproof wall for a vehicle, which is suitable for application to the manufacturing of a vehicle.

The present applicant previously proposed a method for manufacturing a double soundproof wall for a vehicle in Japanese Patent Application No. 13724715/1983. That is, to explain the above manufacturing method with reference to FIGS. 1 to 5, in FIG. 1, 1 is a first plate member (hereinafter referred to as an inner member) forming the inner wall of the dash panel of the present invention, and in FIG. The second plate member (
(hereinafter referred to as the outer member), and both members 1 and 2 have control cable pipe through holes a) Brake master cylinder mounting hole b) Heater hot water hose through hole C) Steering handlebar 5 Shaft through hole d Necessary holes such as the above are provided in correspondence with each other, and the member 2 is also provided with a plurality of gas vent holes e that are necessary when manufacturing this dash panel. Further, both members 1 and 2 are provided with a plurality of driving beads f and a peripheral edge g that are joined to each other by a phase 30 when the two members 1 and 2 form a double wall as shown in the figure. 3 in FIG. 3 is a thermally foamable sound insulation material sheet (hereinafter referred to as sound insulation material) interposed between the above-mentioned two members 1 and 2, and is a plate-shaped sheet made of foamed rubber, foamed resin, etc. 35 The sound insulation material 3 is It has the property of causing a foaming phenomenon when heated and increasing its volume.

Further, the sound insulating material 3 is provided with holes corresponding to the respective holes provided in the two members 1 and 2, and an escape hole h for the joint portion of the driving bead f. To make a duplex panel for a double soundproof wall using the above manufacturing method, the above three members 1
, 2, and 3 are integrally formed in the following manner.

First, the member 1 forming the inner wall and the member 2 forming the outer wall are butted together using a suitable jig, and the sound insulating material 3 is interposed between the two members 1, 2. The sound insulating material 3 is held between part g and the plurality of driven bead parts.

Then, the peripheral edge portions and the implanted bead portion f are welded by spot welding to integrate the members 1, 2, and 3. (
(See Figure 4) Then, when the integrated member is placed in a suitable heating means such as a heat furnace and the sound insulating material 3 is heated and foamed, the gap between both members 1 and 2 is completely filled with the sound insulating material. A duplex soundproof panel is obtained, which is filled with a double soundproof wall and has a soundproof material sealed between both members.

(See FIG. 6.) As shown in FIG. Since the cable member is simply inserted, there is relatively little resistance between the electric wire 10 and the sound insulating material 3, which causes the cable member to easily slip out from both the inner and outer members 1 and 2.

The present invention was devised to solve the above-mentioned drawbacks.
In the double structure wall in which a first plate-like member and a second plate-like member are joined at their peripheral edges to form a hollow part, a gas venting hole is provided in both the first and second plate-like members, and a control cable is provided. A hole for the insertion of cable members such as pipes and electric wires, and a recessed part sunken toward the inside of the hollow part so as to connect with each other are formed, and the thermally foamable sound insulating member housed in the hollow part has the above-mentioned structure. An escape hole for spot welding is provided corresponding to the recessed part, and when the two plate members are joined, the thermally foamable sound insulating member is held in the recessed part, the peripheral edge part is joined, and the recessed part is The part is spot welded to make a hermetically sealed state, and the cable member has approximately the same outer diameter as the cable member to be inserted into the cable member insertion hole, and an uneven part is formed in the same outer diameter part in the axial direction. The formed dummy rod is loosely inserted into the hole for insertion of the cable member, inserted into and supported by the sound insulation member, and after foaming the thermally foamable sound insulation member, the dummy rod is pulled out from the hole and replaced. The object of the present invention is to provide a method for manufacturing a double soundproof wall for a vehicle, characterized in that the cable member is configured to be inserted through the same hole.

Next, the present invention will be specifically explained based on the embodiments shown in FIGS. 7 to 9.

Note that the same parts or members as in FIGS. 1 to 6 above are given the same reference numerals as those used in the respective figures.

Reference numeral 5 denotes a dummy rod that is inserted into a wire through hole 6 formed in the inner member 1, the sound insulating material 3, and the outer member 2, and has an outer diameter that is approximately equal to the outer diameter of the wire. A thread groove 7 is formed on the outer diameter portion.

In the state shown in FIG. 7, the sound insulation material 3 is foamed,
Holding the pull-out ring 8 provided at the end of the dummy rod 5,
When the dummy rod 5 is pulled out from the through hole 6 while being rotated, a threaded groove shaped portion 9 corresponding to the threaded groove 7 of the dummy rod is formed near the through hole 6 of the sound insulating material 3, as shown in FIG. It is formed. When the electric wire 10 is press-fitted into the through hole 6 from this state, the electric wire 10 is crimped with the thread groove shaped part 9, so that the electric wire 10 can be prevented from coming out of the through hole 6 as much as possible, and the watertightness of the dash panel is ensured. It produces the effects that can be achieved. In the above explanation, the case of electric wires has been explained, but it goes without saying that the present invention can also be applied to various control cables and prevention of cable pipes from being pulled out.

In this embodiment, the dummy rod is provided with a threaded groove, but instead of this, a simple ring-shaped uneven groove or a large number of mere protrusions may be provided to form an uneven shape.

As described above, in the present invention, before foaming the thermally foamable sound insulating member,
The outer diameter of the dummy rod that is inserted through and supported by the cable member insertion hole and the sound insulating member is approximately the same as the diameter of the cable member, and has an uneven portion in the axial direction of the dummy rod, so that after foaming, The diameter of the hole after pulling out the dummy rod will be smaller by the depth of the same unevenness, so when the cable member is press-fitted into the hole, the fixing force of the cable member to the sound insulation member can be further strengthened. As a result, it is possible to suppress the rope member from coming off, and moreover, it exhibits an excellent effect of ensuring air-water tightness.

[Brief explanation of the drawing]

Figures 1 to 6 relate to the method of manufacturing a dash panel using the already proposed method. Figures 1 to 3 are perspective views of the external appearance of each part when applied to the manufacture of a dash panel, and Figure 4 is a case where the above parts are integrated. FIG. 5 is a longitudinal sectional view of a certain part of the product, FIG. 6 is a perspective view of the appearance of the dash panel, and FIG. 7 is a hole through which a wire passes when inserting a dummy rod in an embodiment of the present invention. Longitudinal sectional view at 6, No. 8
The figure shows the state in which the above dummy rod is removed after foaming the sound insulation material.
FIG. 9 is a longitudinal sectional view similar to the one shown in the figure, and is a longitudinal sectional view when the electric wire 10 is press-fitted into the through hole 6 in the state shown in FIG. 8. 5...Dummy rod, 7...Thread groove, 10
······Electrical wire.

Claims (1)

[Claims] 1. In a double structure wall in which a hollow portion is formed by joining a first plate-like member and a second plate-like member at their peripheral edges, the first and second
A hole for degassing, a hole for inserting a cable member such as a control cable pipe or an electric wire, and a recessed part sunken toward the inside of the hollow part so as to abut each other are formed in both plate-like members, and the above-mentioned An escape hole for spot welding is provided in the thermally foamable sound insulating member housed in the hollow part in correspondence with the recessed part,
When joining the two plate members, the thermally foamable sound insulating member is held in the recess, the peripheral edges are joined, the recess is spot welded to seal, and the cable member is inserted into the hole. A dummy rod having approximately the same outer diameter as the cable member to be inserted into the hole and having a concavo-convex portion formed in the axial direction on the same outer diameter is loosely inserted into the cable member insertion hole. After the thermally foamable sound insulating member is inserted into and supported by the sound insulating member and foamed, the dummy rod is pulled out from the hole, and the cable member is inserted into the hole instead. Features: How to make double soundproof walls for vehicles.