JP3294718B2 - Dashboard insulator mounting structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insulator mounting structure for a dashboard.

[0002]

2. Description of the Related Art Although a dashboard is provided between an engine room and a vehicle compartment, vibrations and sounds generated in the engine room easily enter the vehicle compartment through the dashboard. In particular, there is a possibility that vibrations and sounds transmitted through the dashboard may enter the vehicle interior through the cowl box 8 together with the outside air introduced from the opening of the cowl top grill. To prevent this, the dashboard is provided with an insulator for isolating vibration and sound.

For example, Japanese Unexamined Utility Model Publication No. 58-143752, "Engine Room Insulator" has been proposed. According to FIG. 2 of the publication, a dash lower 2 and a cowl top 4 are disclosed.
A panel insulator 10 covers the entire surface of the panel (which roughly corresponds to a dashboard).

[0004]

However, in the above prior art, since the entire surface of the dash lower 2 and the cowl top 4 is covered with the panel insulator 10, the mounting range of the insulator is widened and the mounting work is troublesome.

An object of the present invention is to simplify the mounting of an insulator on the dashboard.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a dashboard for separating an engine room and a vehicle compartment from a lower portion of a dashboard erected from a floor of the vehicle compartment and an upper end of the lower portion of the dashboard. A wiper drive mechanism for driving a wiper at an upper surface of the upper part of the dashboard and at a substantially central position in a vehicle width direction. An insulator mounting structure for a dashboard, wherein an insulator for blocking vibration and sound is mounted on a lower surface of the vehicle and at a portion where the wiper driving mechanism is not disposed.

[0007]

The vibration and sound from the engine room to the vehicle compartment are blocked by the insulator attached to the lower surface of the dashboard. However, the wiper drive mechanism mounting portion where the insulator is not mounted is shut off by the heavy wiper drive mechanism. This allows the insulator to be only partially installed.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings should be viewed in the direction of the reference numerals,
“Front”, “rear”, “left”, and “right” follow directions viewed from the driver. FIG. 1 is a sectional view of a front portion of a vehicle body to which a dashboard according to the present invention is attached.
Reference numeral 1 denotes an engine room 2 at the front (left side in this figure) of the vehicle body 1 and a compartment 3 at the rear (right side in this figure). The dashboard 11 includes a dashboard lower part 12 erected from the floor 4 of the passenger compartment 3 and a dashboard lower part 1.
2 and a dashboard upper portion 13 extending from the upper end portion to the engine room 2 side.

A front window 5 is attached to a front upper portion of the vehicle compartment 1, and a cowl top grille 6 extending forward of the vehicle body 1 is disposed below the front window 5. On the other hand, the dashboard upper part 13 has the cowl top grill 6
And a front portion 14a of the cowl top grille 6 having a substantially horizontal portion 14 opposed to the lower surface of the cowl top grille 6. A wiper drive mechanism (shown by imaginary lines) 21 is disposed on the upper surface of the horizontal portion 14, and an insulator 17 for isolating vibration and sound is provided on the lower surface of the horizontal portion 14 and on a portion where the wiper drive mechanism 21 is not disposed. Is installed.

The wiper drive mechanism 21 drives a wiper (not shown) for wiping the glass surface of the front window 5 through a link mechanism, and is composed of a motor, a speed reduction mechanism, and the like. In order to secure a space for disposing the wiper drive mechanism 21 between the dashboard upper part 13 and the cowl top grille 6, the horizontal part 14 is provided with the wiper drive mechanism 2
The portion where 1 is disposed is formed so as to be lowered to a height H indicated by an imaginary line in this figure. In addition, 7 is a hood and 8 is a cowl box. The cowl box 8 includes a cowl box lower portion 8a and a cowl box upper portion 8b.

FIG. 2 is a plan view of a front portion of a vehicle body to which a dashboard according to the present invention is attached. In this figure, an engine room 2 is shown on the left and a cabin 3 is shown on the right. The wiper drive mechanism (shown by imaginary lines) 21 is disposed at a substantially central position in the vehicle width direction, and the insulators 17 are attached to both left and right sides of the vehicle width direction where the wiper drive mechanism 21 is not disposed (the hatched portions in this figure). Have been. Reference numeral 6b denotes a hole formed in the cowl top grill 6 for passing the link mechanism of the wiper drive mechanism 21.

FIG. 3 is a sectional view of a dashboard insulator mounting structure according to the present invention. A back panel 18 to which an insulator 17 is mounted is fixed to the lower surface of the horizontal portion 14.

Next, a method of mounting the insulator 17 will be described. First, the sheet-like insulator 17 is attached to the back panel 18. Next, the back panel 18 is welded to the lower surface of the horizontal portion 14 (not shown). Upper dashboard 1 with insulator 17
By heating 3 in a heating furnace, the insulator 17 is foamed and the insulator 17 is welded to the lower surface of the horizontal portion 14 and the back panel 18.

As a result, the insulator 17 made of a foam is completely adhered to the lower surface of the horizontal portion 14 and the back panel 18. Therefore, the horizontal portion 14 is suppressed from being resonated by vibration and sound generated in the engine room 2, so that the vibration-proof effect and the sound-proof effect are improved. Also, the heat insulating effect is improved. Further, in the welding process of assembling the vehicle body 1 by welding and connecting the vehicle body members, the dashboard upper portion 13 to which the insulator 17 is attached can be simultaneously welded and connected. For this reason, the work is easier than in the case where the insulator 17 is attached to the dashboard upper part 13 with the clip on the vehicle body assembly line, which is the conventional method.

Next, the operation of the dashboard insulator mounting structure having the above-described structure will be described with reference to FIG. The outside air introduced from the opening of the cowl top grill 6 passes through the upper side of the dashboard upper part 13 and is taken into the passenger compartment 3 via an air conditioner (not shown) in the cowl box 8. Vibrations and sounds from the engine room 2 to the vehicle room 3 pass through the upper part 13 of the dashboard. The dashboard upper part 13 is provided with a wiper drive mechanism 21 at the center and insulators 17 at both left and right ends. Vibration and sound passing right and left are cut off by the insulator 17, and vibration and sound passing through the central portion are cut off for the following reason.

In general, a heavy object (an object having a large weight per unit area) has a high effect of attenuating vibration and sound and is easy to block. The wiper drive mechanism 21 is heavy, and vibrations and sounds transmitted from the engine room 2 via the horizontal portion 14 are attenuated by the wiper drive mechanism 21. For this reason, the portion where the wiper drive mechanism 21 is disposed can block vibration and sound without attaching the insulator 17.

Further, since the wiper drive mechanism 21, which is a heavy object, is disposed substantially at the center of the horizontal portion 14 in the vehicle width direction, resonance of the entire horizontal portion 14 due to vibration and sound generated in the engine room 2 is suppressed. Therefore, the vibration-proof effect and the sound-proof effect are improved.

[0018]

As described above, according to the present invention, the wiper drive mechanism is disposed on the upper surface of the dashboard and substantially at the center in the vehicle width direction, and the wiper drive mechanism is not disposed on the lower surface of the dashboard upper portion. By installing an insulator to block vibration and sound in the part, vibration and sound from the engine room to the vehicle compartment are blocked by the insulator, and vibration and sound in the central part without insulator are heavy wipers. Since it is attenuated by the drive mechanism,
Vibration and sound can be cut off without attaching an insulator to the portion where the wiper drive mechanism is disposed. Therefore, since it is not necessary to mount the insulator on the entire upper surface of the dashboard, the installation of the insulator is simple.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a front part of a vehicle body to which a dashboard according to the present invention is attached.

FIG. 2 is a plan view of a front portion of a vehicle body to which a dashboard according to the present invention is attached.

FIG. 3 is a cross-sectional view of a dashboard insulator mounting structure according to the present invention.

[Explanation of symbols]

1 ... body, 2 ... engine room, 3 ... car room, 4 ... floor, 5 ... front window, 6 ... cowl top grill,
11: Dashboard, 12: Lower part of the dashboard, 1
3 Upper part of dashboard, 14 horizontal part, 17 insulator, 18 back panel, 21 wiper drive mechanism.

Continuation of the front page (56) References JP-A-6-40351 (JP, A) JP-A 5-22268 (JP, U) JP-A 61-9353 (JP, U) JP-A 64-9854 (JP) , U) Japanese Utility Model Showa 58-143752 (JP, U) Japanese Utility Model Application Hei 5-44710 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B60R 13/08 B60H 1/28

Claims (1)

(57) [Claims] 1. A dashboard for separating an engine room and a vehicle compartment from a dashboard lower portion erected from the floor of the vehicle compartment and a dashboard upper portion extending from the upper end of the dashboard lower portion to the engine room side. Make up,
A wiper drive mechanism for driving the wiper is disposed on the upper surface of the dashboard and at a substantially central position in the vehicle width direction,
An insulator mounting structure for a dashboard, wherein an insulator for blocking vibration and sound is mounted on a lower surface of an upper portion of the dashboard and on a portion where the wiper driving mechanism is not arranged.