JPH0769246A - Front floor tunnel part structure for vehicle - Google Patents

Abstract

PURPOSE:To provide a front floor tunnel part structure for vehicle by which a noise by solid propagation or air propagation or the like can be reduced. CONSTITUTION:A front floor panel 11 has a plane part 11a and a tunnel part 11b extending upward in the longitudinal direction of a vehicle almost in the center part in the vehicle width direction of the plane part 11a, and an engine mount member 12 is fixed in the longitudinal direction of the vehicle on the underside of the front floor panel 11 by striding over both in a boundary part between the tunnel part 11b and the plane part 11a. A tunnel reinforce 17 is fixed to the upper side of the tunnel part 11b so as to cover a surface of the tunnel part 11b, and the tunnel reinforce 17, the front floor panel 11 and the engine mount member 12 are fastened together in a three-sheeted shape.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a tunnel portion provided on a front floor of a vehicle, and more particularly to a structure of an engine mount portion.

[0002]

2. Description of the Related Art Conventionally, as this type, for example, there is one shown in FIGS. In the figure, reference numeral 1 is a front floor panel, and this front floor panel 1
Has a flat surface portion 1a and a tunnel portion 1b formed in the vehicle width direction central portion of the flat surface portion 1a along the vehicle front-rear direction. The tunnel portion 1b is formed so as to bulge upward, and the engine mount bracket 2 is disposed in the tunnel portion 1b by welding both end portions 2a. The support member 3 is screwed to the engine mount bracket 2.

A transmission 5 is supported by the support member 3 via an insulator 4.

Reference numeral 6 in FIG. 6 is an insulator.

Other examples of this type include, for example, Japanese Utility Model Laid-Open No. 61-147651 and Japanese Utility Model Laid-Open No. 61-17917.
There is one as described in Japanese Patent Laid-Open No. 6.

[0006]

However, in such a conventional device, both end portions 2a of the engine mount bracket 2 are simply welded and arranged inside the tunnel portion 1b. The rigidity of the tunnel portion 1b itself is low, noise is likely to be generated in the tunnel portion 1b due to solid propagation from the transmission 5 and the like, and noise generated in the vehicle interior through the tunnel portion 1b due to air propagation is also large.

[0007] Therefore, an object of the present invention is to provide a vehicle front floor tunnel structure for reducing noise generated by solid propagation, air propagation and the like.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems. A front floor panel is a flat portion and a substantially central portion in the vehicle width direction of the flat portion. And a tunnel portion formed by bulging,
On the lower side of the front floor panel, an engine mount member is fixed along the front-rear direction of the vehicle straddling the tunnel section and the flat section at both sides, and on the upper side of the tunnel section. The structure is characterized in that a tunnel reinforcement is fixed so as to cover the top of the tunnel, and a vehicle front floor tunnel structure is formed in which the tunnel reinforcement, the front floor panel, and the engine mount member are struck three times.

An insulator may be interposed between the tunnel reinforcement and the front floor panel.

[0010]

[Operation] According to such means, by hitting three pieces of the tunnel reinforcement, the front floor panel, and the engine mount member, the tunnel reinforcement on the upper side of the front floor panel and the engine mount member on the lower side are hit. By continuously connecting the front floor panel with the front floor panel interposed, the rigidity of this portion can be improved, and the supporting rigidity of the transmission or the like can be improved.

Therefore, the rigidity of the tunnel portion can be improved to reduce the noise generated by the solid propagation, and the tunnel reinforcement and the engine mount member can be connected continuously to reduce the noise caused by the air propagation. .

Further, by interposing an insulator between the tunnel reinforcement and the front floor panel, the sound insulation can be further improved.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

1 and 2 show a first embodiment of the present invention.

First, the structure will be described. In the figure, reference numeral 11 is a front floor panel.
Has a flat surface portion 11a and a tunnel portion 11b formed in the vehicle width direction central portion of the flat surface portion 11a along the vehicle front-rear direction.

The tunnel portion 11b is formed so as to bulge upward and has a generally U-shaped cross section from the pair of vertical wall portions 11c and the upper surface portion 11d.

The tunnel portion 11b and the plane portion 1 are
On the lower surface side of both lower corners 11e at the boundary position with 1a,
The engine mount member 12 is arranged along the vehicle front-rear direction. This engine mount member 1
As shown in FIG. 2, 2 has a substantially L-shaped cross section and has a predetermined length in the vehicle front-rear direction. As shown in FIG. 1, the upper edge 12a is a vertical wall portion of the tunnel portion 11b. 11c,
Further, the lower end edge portion 12b is joined to the flat surface portion 11a, so that the lower end edge portion 12b is provided so as to straddle between the tunnel portion 11b and the flat surface portion 11a. The rear end portion 12c of the engine mount member 12 is extended and fixed to the position where the second cross member 19 is disposed.

This pair of engine mount members 1
As shown in FIG. 1, a support member 13 is screwed to and installed on the frame 2, and the transmission 14 is supported by the support member 13 via an insulator 15.

Further, a tunnel reinforcement 17 is provided on the tunnel portion 11b via a mel sheet 16 as an "insulator". The tunnel reinforcement 17 has a shape substantially conforming to that of the tunnel portion 11b so as to cover the tunnel portion 11b. ing.

Furthermore, this tunnel reinforcement 17
An instrument stay bracket 18 for attaching an instrument panel (not shown) is joined to the.

According to this structure, the tunnel reinforcement 17, the front floor panel 11, and the engine mount member 12 are struck three times, whereby the tunnel reinforcement 17 above the front floor panel 11 is struck.
By connecting the lower engine mount member 12 and the lower engine mount member 12 with the front floor panel 11 interposed therebetween, the rigidity of this portion can be improved,
The support rigidity of the transmission 14 and the like can be improved.

Therefore, since the support rigidity of the transmission 14 can be improved, it is possible to reduce the sound generated by the solid propagation.

Further, over a predetermined length in the front-rear direction of the vehicle,
Since the engine mount member 12 and the tunnel reinforcement 17 are continuous with the front floor panel 11 interposed, it is possible to reduce sound transmission due to air propagation.

Further, since the mel sheet 16 is interposed between the tunnel reinforcement 17 and the front floor panel 11, the sound and vibration performance is further improved. This mel sheet 16 is used for the front floor panel 11
It becomes possible to intervene by disposing the tunnel reinforcement 17 on the upper side.

FIG. 3 shows a second embodiment of the present invention.

In this embodiment, the tunnel reinforcement 2 is used.
The shape of 7 is different from that of the first embodiment.

That is, this tunnel reinforcement 2
7 extends downward from the tunnel reinforcement 17 of the first embodiment, and the lower end portion 27a has a front floor panel 1
1 and the lower end edge portion 12b of the engine mount member, three sheets are struck, and the middle portion 27b is the front floor panel 1
Three sheets are struck together with 1 and the member upper edge 12a for the engine mount.

A mel sheet 16 is interposed between the two intermediate portions 27b as in the first embodiment, and a closed cross-section portion 28 is formed between the intermediate portion 27b and the lower end portion 27a.

By forming the closed cross section 28 in this way, both the rigidity and the sound insulation are improved as compared with the first embodiment.

The other structure and operation are the same as those of the first embodiment, and the explanation thereof will be omitted.

Further, FIG. 4 shows a third embodiment of the present invention.

In this embodiment, the closed cross section 28 of the second embodiment is used.
Inside the tunnel reinforcement 27, Mel sheet 2
9 are provided.

Therefore, the sound insulation performance and the like are improved as compared with the second embodiment.

Since the other structure is the same as that of the second embodiment, its explanation is omitted.

[0035]

As described above, according to the present invention, by hitting three pieces of the tunnel reinforcement, the front floor panel, and the engine mount member, the tunnel reinforcement on the upper side of the front floor panel and the lower portion of the front panel are hit. By continuously connecting the engine mount member on the side with the front floor panel interposed therebetween, the rigidity of this portion can be improved and the noise generated by solid propagation can be reduced. The noise due to air propagation can be reduced by connecting the tunnel reinforcement and the engine mount member in series.

Further, by interposing an insulator between the tunnel reinforcement and the front floor panel, the sound insulation can be further improved, which is a practically useful effect.

[Brief description of drawings]

FIG. 1 is a sectional view of a portion corresponding to line AA of FIG. 2 showing a first embodiment of the present invention.

FIG. 2 is an exploded perspective view showing the same embodiment.

FIG. 3 is a sectional view corresponding to FIG. 1 showing a second embodiment of the present invention.

FIG. 4 is a sectional view corresponding to FIG. 1 showing a third embodiment of the present invention.

FIG. 5 is a perspective view of a floor showing a conventional example.

FIG. 6 is a sectional view taken along the line BB of FIG. 5 showing the conventional example.

FIG. 7 is a side view of a tunnel portion showing the conventional example.

[Explanation of symbols]

 11 Front floor panel 11a Plane part 11b Tunnel part 12 Engine mount member 17,27 Tunnel reinforcement 16,29 Mel seat (insulator)

Claims (2)

[Claims] 1. A front floor panel has a flat surface portion and a tunnel portion which is formed at a substantially central portion of the flat surface portion in a vehicle width direction so as to bulge upward along a vehicle front-rear direction. On the lower side, the engine mount member is fixed along the vehicle front-rear direction across the both at the boundary between the tunnel portion and the plane portion, and on the upper side of the tunnel portion, the upper portion of the tunnel portion is fixed. A front floor tunnel structure for a vehicle, characterized in that a tunnel reinforcement is fixed so as to cover it, and three pieces of the tunnel reinforcement, a front floor panel, and an engine mount member are struck. 2. The front floor tunnel portion structure for a vehicle according to claim 1, wherein an insulator is interposed between the tunnel reinforcement and the front floor panel.