JP7288000B2 - Body front structure - Google Patents

Description

The present invention relates to a front body structure of a vehicle such as an automobile.

For example, Patent Literature 1 discloses a front side frame whose rear end of the vehicle extends to a floor panel via a bent portion that slopes downward from the upper side of the vehicle toward the rear side of the vehicle. ing.

JP 2013-151225 A

By the way, the vehicle front portion of the front side frame is located above the floor panel and is provided so as to be offset (bent) outward in the vehicle width direction. Therefore, stress acts on the vehicle front portion of the front side frame in a direction inclined outward in the vehicle width direction centering on the bent portion. In order to suppress this stress, further improvements in vehicle body accuracy and vehicle body rigidity are required.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a vehicle body front structure capable of suppressing stress acting in a direction that inclines outward in the vehicle width direction around a bent portion. aim.

To achieve the above object, the present invention provides a front side frame extending in the longitudinal direction of the vehicle , a dashboard that separates the power unit chamber and the passenger compartment, and a dashboard that is provided on the floor along the longitudinal direction of the vehicle. and a tunnel side frame composed of a front tunnel side frame and a rear tunnel side frame. In the inclined surface, the front side frame has a bent portion that bends along the inclined surface so as to be located lower than the vehicle toward the rear of the vehicle when viewed from the side, and is lower than the bent portion. A vehicle front portion of the front side frame located forward of the vehicle is bent upward and outward in the vehicle width direction, and a vehicle rear portion of the front side frame located rearward of the vehicle relative to the bent portion extends along the floor surface. and the vehicle rear end of the vehicle rear portion of the front side frame extends further rearward of the vehicle than the vehicle rear end of the front tunnel side frame. The vehicle rear end of the portion has a vehicle width direction outer bent portion that bends toward the vehicle width direction outer side toward the vehicle rear side.

According to the present invention, it is possible to obtain a vehicle body front structure capable of suppressing stress acting in a direction that inclines outward in the vehicle width direction about the bent portion.

1 is a bottom view of a vehicle body front portion of a vehicle to which a vehicle body front portion structure according to an embodiment of the present invention is applied, viewed from below the vehicle body; FIG. FIG. 4 is a cross-sectional view showing an inclined surface provided on the dashboard lower and a bent portion of the front side frame; It is the perspective view which looked at the dashboard from the vehicle interior side. FIG. 2 is a partially enlarged bottom view of FIG. 1; FIG. 3 is a cross-sectional view taken along line VV of FIG. 2; FIG. 3 is a cross-sectional view taken along line VI-VI of FIG. 2;

Next, embodiments of the present invention will be described in detail with reference to the drawings as appropriate. In each figure, "front and back" indicates the longitudinal direction of the vehicle, "left and right" indicates the width direction of the vehicle (horizontal direction), and "up and down" indicates the vertical direction of the vehicle (vertical direction).

As shown in FIG. 1, a vehicle body front portion 10 of a vehicle to which the vehicle body front portion structure according to the embodiment of the present invention is applied has a pair of left and right front sides extending in the vehicle front-rear direction on both left and right sides along the vehicle width direction. A frame 12, a pair of left and right upper members 14 arranged on the outside of each front side frame 12 in the vehicle width direction and extending in the vehicle front-rear direction on the upper side, and a floor panel ( A pair of left and right side sills 16 are arranged on both left and right sides of a front floor panel 15 and extend along the longitudinal direction of the vehicle.

Further, the vehicle body front portion 10 includes a damper housing 18 spanned between the front side frame 12 and the upper member 14 and a damper base 20 fixed to the upper end of the damper housing 18 .

As shown in FIG. 1, a dashboard 24 is provided at the vehicle rear of each damper housing 18 to separate the power unit chamber 22 from the vehicle interior. As shown in FIG. 3, the dashboard 24 includes a body portion 26, a dashboard lower portion 28 provided below the body portion 26, and the dashboard lower portion 28 disposed on the interior side of the vehicle, extending in the vehicle width direction. A pair of left and right dashboard cross members 30 extend along the dashboard cross member 30 .

The dashboard lower 28 faces the power unit chamber 22 and has an inclined surface 32 that slopes down from the front of the vehicle toward the rear of the vehicle (see FIG. 2). A pair of left and right dashboard cross members 30 are arranged along the vehicle width direction on the cabin side of the inclined surface 32 of the dashboard lower 28 (see FIG. 3).

As shown in FIG. 2 , the front side frame 12 is bent along the sloped surface 32 of the dashboard lower 28 so as to be positioned lower toward the rear of the vehicle when viewed from the side. It has a bent portion 34 .

At the inclined surface 32 of the dashboard lower 28, the front side frame 12 has an opening 36 that opens upward and has a hat-shaped cross section perpendicular to the axis. As shown in FIG. 5 , the front half portion of the front side frame 12 located in front of the vehicle with respect to the bent portion 34 has a vertically elongated rectangular shape in a vertical section. At the vehicle rear portion of the front side frame 12 along the inclined surface 32 of the dashboard lower 28, the left and right side walls 38 are provided with stepped portions 40 each having a stepped shape (see FIGS. 5 and 6).

A vehicle front portion of the front side frame 12 located in front of the vehicle relative to the curved portion 34 has a curved portion 42 that is curved upward and outward in the vehicle width direction (see FIG. 1). On the other hand, the vehicle rear portion of the front side frame 12 positioned at the vehicle rear side of the bent portion 34 extends horizontally and vehicle rearward along the floor surface of the floor panel 15, and the vehicle front tunnel side frame 44, which will be described later, extends toward the vehicle rear side. It extends further to the rear of the vehicle than the rear end 44a (see FIG. 1). That is, the vehicle rear end 12a of the front side frame 12 is located at the rear of the vehicle relative to the vehicle rear end 44a of the front tunnel side frame 44 (see FIG. 1).

The front side frame 12 is configured in an arch shape (see the thick dashed line in FIG. 1) with the bent portion 34 as the apex T when viewed from the bottom.

In a cross section perpendicular to the axis of the front side frame 12, the front half has a vertically elongated rectangular shape on the side of the front tunnel side frame 44 (see FIG. 5), and the rear half extends from the front tunnel side frame 44 toward the rear of the vehicle. It is provided so as to change into a horizontally long rectangular shape (see FIG. 6). That is, the front side frame 12 is provided so that the aspect ratio (horizontal:vertical) varies between the front half portion and the rear half portion.

The inclined surface 32 of the dashboard lower 28 has a floor joint portion 46 joined to the front end of the floor panel 15 outside the front tunnel side frame 44 in the vehicle width direction (see FIG. 1). In addition, the inclined surface 32 of the dashboard lower 28 has a tunnel joint portion 50 joined to the front end of a tunnel portion 48 (described later) inside the front tunnel side frame 44 in the vehicle width direction (see FIG. 1). When viewed from the bottom, the floor joint portion 46 and the tunnel joint portion 50 are arranged so that the tunnel joint portion 50 is positioned in front of the vehicle, and the floor joint portion 46 is positioned in the rear of the vehicle, and are offset in the longitudinal direction of the vehicle. (see Figure 1).

The inclined surface 32 of the dashboard lower 28 is continuously fixed to the front side frame 12 along the longitudinal direction of the front side frame 12 . For example, in FIG. 4, "x" marks indicate joints by spot welding, and halftone dots indicate joints by adhesive.

As shown in FIG. 1, the inclined surfaces 32 of the dashboard lower 28 are arranged on both sides in the vehicle width direction with the tunnel portion 48 interposed therebetween. The vehicle rear end 12a of the front side frame 12 and the vehicle rear end 44a of the front tunnel side frame 44 protrude (protrude) toward the vehicle rear from the vehicle rear end 28a of the dashboard lower 28 (FIGS. 1 and 4). 3).

Between the pair of left and right front side frames 12 , a tunnel portion 48 extending along the vehicle front-rear direction is provided by the lower end portion of the dashboard lower 28 and the floor panel 15 . A pair of left and right tunnel side frames 52 extending along the vehicle front-rear direction are arranged on the bottom surface of the floor panel 15 on both sides of the tunnel portion 48 in the vehicle width direction. Each tunnel side frame 52 is composed of two members, a front tunnel side frame 44 in front of the vehicle and a rear tunnel side frame 54 in the rear of the vehicle. A vehicle front end of the tunnel portion 48 is positioned in front of the vehicle relative to the bent portion 34 (see FIG. 1).

The vehicle rear end 12a of the vehicle rear portion of the front side frame 12 has a vehicle width direction outer bent portion 56 that bends toward the vehicle width direction outer side toward the vehicle rear side. The vehicle width direction outer bent portion 56 is disposed rearward of the vehicle relative to the vehicle rear end 44a of the front tunnel side frame 44 (see FIG. 1). The vehicle rear end 12a of the vehicle rear portion of the front side frame 12 is connected to the vehicle front end of the floor frame 49 (see FIG. 1).

A dashboard cross member 30 and an outrigger 58 are arranged in front of the bending portion 34 with respect to the vehicle. The front side frames 12 are supported by dashboard cross members 30 and outriggers 58, respectively.

A side sill 16 extending along the vehicle front-rear direction is provided outside the front side frame 12 in the vehicle width direction. An outrigger 58 that is joined to the vehicle front end of the side sill 16 is arranged on the inclined surface 32 of the dashboard lower 28 provided on the vehicle front side of the bent portion 34 . An inner frame connecting member 60 that is joined to the vehicle front end of the front tunnel side frame 44 is arranged on the opposite side of the outrigger 58 with the front side frame 12 interposed therebetween. The outriggers 58 and the inner frame connecting member 60 are arranged along the vehicle width direction.

The vehicle body front portion 10 of the vehicle to which the vehicle body front portion structure according to the present embodiment is applied is basically configured as described above, and the effects thereof will be described below.

In this embodiment, a dashboard lower 28 provided below the dashboard 24 has an inclined surface 32 that slopes down from the front of the vehicle toward the rear of the vehicle. At this inclined surface 32, the front side frame 12 has a bent portion 34 that bends along the inclined surface 32 so as to be positioned downward toward the rear of the vehicle when viewed from the side. A vehicle front portion of the front side frame 12 located in front of the vehicle relative to the bent portion 34 has a bent portion 42 that bends upward and outward in the vehicle width direction. A vehicle rear portion of the front side frame 12 located behind the bent portion 34 extends horizontally and toward the vehicle rear along the floor surface of the floor panel 15 . A vehicle rear end 12 a of the vehicle rear portion of the front side frame 12 extends further toward the vehicle rear than the vehicle rear end 44 a of the front tunnel side frame 44 .

In the present embodiment, in the front side frame 12, the vehicle rear end 12a of the vehicle rear portion of the bent portion 34 is extended further to the vehicle rear side than in the conventional art, so that the front side frame 12 can move toward the vehicle with the bent portion 34 as the center. It is possible to suppress the stress acting in the direction in which the front portion inclines outward in the vehicle width direction. Thereby, the positional accuracy of the vehicle front end of the front side frame 12 can be improved.

Further, in the present embodiment, the vehicle rear end 12a of the vehicle rear portion of the front side frame 12 is extended rearward of the vehicle beyond the vehicle rear end 44a of the front tunnel side frame 44 so that the joint position with the other frame is positioned at the vehicle front and rear. By offsetting in the direction, the joining positions of the front side frame 12, the front tunnel side frame 44, and other frames can be shifted in the vehicle longitudinal direction. By shifting the joint position of each frame, the floor rigidity can be improved by reducing the rigidity reduction area in the front-rear direction of the floor. Furthermore, in this embodiment, since addition of a new reinforcing material or the like is unnecessary, weight reduction can be achieved without increasing the manufacturing cost.

Further, in the present embodiment, a tunnel portion 48 extending along the vehicle front-rear direction is provided by the lower end portion of the dashboard lower 28 and the floor panel 15 . A vehicle front end of the tunnel portion 48 is located forward of the vehicle relative to the bent portion 34 of the front side frame 12 . In the present embodiment, by arranging the vehicle front end of the tunnel portion 48 in front of the vehicle with respect to the bent portion 34, the front collision load is received and absorbed by the tunnel portion 48 together with the front side frames 12 and the front tunnel side frames 44. be able to.

Further, in the present embodiment, the vehicle rear end 12a of the vehicle rear portion of the front side frame 12 has a vehicle width direction outer bent portion 56 that bends toward the vehicle width direction outer side toward the vehicle rear side. In this embodiment, by providing the vehicle width direction outer bent portion 56, the rear tunnel side frame 54 connected to the vehicle rear end 44a of the front tunnel side frame 44 passes through the center of the floor panel 15 in the vehicle longitudinal direction. can be placed. Thereby, in this embodiment, the rigidity and strength of the floor panel 15 can be improved.

Furthermore, in the present embodiment, the vehicle width direction outer bent portion 56 is arranged behind the vehicle rear end 44 a of the front tunnel side frame 44 . As a result, in the present embodiment, it is possible to suppress the occurrence of a break point in the vehicle rear portion of the front side frame 12 in the vicinity of the vehicle rear end 44 a of the front tunnel side frame 44 .

Furthermore, in the present embodiment, side sills 16 extending along the vehicle front-rear direction are provided outside the front side frames 12 in the vehicle width direction. An outrigger 58 that is joined to the vehicle front end of the side sill 16 is arranged on the inclined surface 32 of the dashboard lower 28 provided on the vehicle front side of the bent portion 34 . An inner frame connecting member 60 that is joined to the vehicle front end of the front tunnel side frame 44 is arranged on the opposite side of the outrigger 58 with the front side frame 12 interposed therebetween. The outriggers 58 and the inner frame connecting member 60 are arranged along the vehicle width direction.

In this embodiment, by arranging the outriggers 58 and the inner frame connecting member 60 in the vehicle width direction on the inclined surface 32 of the dashboard lower 28, the bent portion 34 that is vulnerable to the frontal collision load can be reinforced. As a result, in this embodiment, the reinforcement of the bent portion 34 allows the front side frame 12 to receive and absorb a greater frontal impact load.

Furthermore, in the present embodiment, the front side frame 12 is configured in an arch shape with the bent portion 34 as the apex T when viewed from the bottom. As a result, in the present embodiment, the power unit chamber 22 can be expanded by expanding the vehicle front portion of the front side frame 12 outward in the vehicle width direction. In addition, the rigidity and strength of the floor panel 15 can be improved by extending the vehicle rear portion of the front side frame 12 outward in the vehicle width direction and passing through the center of the floor panel 15 .

Furthermore, in the present embodiment, the front side frame 12 has a longitudinally elongated rectangular shape in the front half portion on the side of the front tunnel side frame 44, and changes to a laterally elongated rectangular shape toward the rear of the vehicle. is configured as In the present embodiment, since the front half portion of the front side frame 12 has a longitudinal rectangular cross-section on the front tunnel side frame 44 side, the outriggers 58 and the inner frame connecting member 60 can be easily arranged. In addition, in this embodiment, the longitudinal cross-section of the rear half portion of the front side frame 12 has a horizontally long rectangular shape, so that a desired ground clearance below the floor can be secured.

Furthermore, in this embodiment, the inclined surface 32 of the dashboard lower 28 has a floor joint portion 46 joined to the floor panel 15 outside the front tunnel side frame 44 in the vehicle width direction. It has a tunnel joint portion 50 joined to the tunnel portion 48 inside the front tunnel side frame 44 in the vehicle width direction. The floor joint portion 46 and the tunnel joint portion 50 are arranged so that the tunnel joint portion 50 is positioned at the front of the vehicle and the floor joint portion 46 is positioned at the rear of the vehicle and are offset in the longitudinal direction of the vehicle.

In this embodiment, the floor joint 46 and the tunnel joint 50, which are weak points of floor rigidity in the longitudinal direction of the vehicle, are offset in the longitudinal direction of the vehicle, thereby improving the rigidity of the vehicle body and achieving weight reduction. can do.

Furthermore, in this embodiment, the inclined surface 32 of the dashboard lower 28 is continuously fixed to the front side frame 12 along the longitudinal direction of the front side frame 12 . As a result, in this embodiment, the bent portion 42, which is the weak portion of the front side frame 12 against the frontal collision load, can be reinforced.

Furthermore, in this embodiment, the inclined surfaces 32 of the dashboard lower 28 are arranged on both sides in the vehicle width direction with the tunnel portion 48 interposed therebetween. The vehicle rear end 12a of the front side frame 12 and the vehicle rear end 44a of the front tunnel side frame 44 each protrude from the vehicle rear end 28a of the dashboard lower 28 toward the rear of the vehicle. Accordingly, in this embodiment, the front floor assembly having the rear tunnel side frame 54 can be mounted from above the vehicle, thereby facilitating the assembly work.

Furthermore, in this embodiment, the inclined surface 32 of the dashboard lower 28 is reinforced by arranging the dashboard cross member 30 along the vehicle width direction on the cabin side of the inclined surface 32 of the dashboard lower 28 . can improve frontal collision performance.

Furthermore, in this embodiment, the dashboard cross member 30 and the outriggers 58 are arranged in front of the bending portion 34 with respect to the vehicle. The front side frame 12 is supported by this dashboard cross member 30 and outriggers 58 . As a result, in the present embodiment, the frontal impact load input from the front of the vehicle can be smoothly transmitted from the dashboard cross member 30 and the outriggers 58 to the side sill 16 on the outer side in the vehicle width direction.

Furthermore, in this embodiment, the front side frame 12 has an opening 36 that opens upward and has a hat-shaped cross section perpendicular to the axis. At the vehicle rear portion of the front side frame 12 along the inclined surface 32 of the dashboard lower 28, left and right side walls 38 forming a hat-shaped cross section are provided with stepped portions 40 each having a stepped shape. In this embodiment, the stepped shape of the stepped portion 40 can increase the bending strength, improve frontal collision performance, and achieve weight reduction.

10 Vehicle front 12 Front side frame 12a Vehicle rear edge (of front side frame) 15 Floor panel 16 Side sill 22 Power unit compartment 24 Dashboard 28 Dashboard lower 28a Vehicle rear edge of (dashboard lower) 30 Dashboard cross member 32 Tilt Surface 34 Bent portion 36 Opening 38 Side wall 40 Stepped portion 44 Front tunnel side frame 44a Vehicle rear end (of front tunnel side frame) 46 Floor joint 48 Tunnel section 50 Tunnel joint 54 Rear tunnel side frame 56 Outer joint in vehicle width direction Part 58 Outrigger 60 Inner frame connecting member T Vertex

Claims (12)

a front side frame extending in the longitudinal direction of the vehicle;
a dashboard that separates the power unit room and the vehicle room;
a tunnel side frame provided along the vehicle front-rear direction on the floor surface and comprising a front tunnel side frame and a rear tunnel side frame,
A dashboard lower provided below the dashboard has an inclined surface that slopes down from the front of the vehicle toward the rear of the vehicle,
In the inclined surface, the front side frame has a bent portion that bends along the inclined surface so as to be positioned downward toward the rear of the vehicle when viewed from the side, and
a vehicle front portion of the front side frame located in front of the vehicle relative to the bent portion is bent upward and outward in the vehicle width direction;
A vehicle rear portion of the front side frame positioned to the vehicle rear of the bent portion extends horizontally and vehicle rearward along the floor surface, and
the vehicle rear end of the vehicle rear portion of the front side frame extends further to the vehicle rear than the vehicle rear end of the front tunnel side frame;
The vehicle body front structure, wherein the vehicle rear end of the vehicle rear portion of the front side frame has a vehicle width direction outer bent portion that bends toward the vehicle width direction outer side toward the vehicle rear side. In the vehicle body front structure according to claim 1 ,
A tunnel portion extending along the vehicle front-rear direction is provided by the lower end portion of the dashboard lower and the floor panel,
The vehicle body front portion structure, wherein a vehicle front end of the tunnel portion is located in front of the vehicle with respect to the bent portion. In the vehicle body front structure according to claim 1 ,
The vehicle body front portion structure, wherein the vehicle width direction outer bent portion is arranged at the vehicle rear side of the vehicle rear end of the front tunnel side frame. In the vehicle body front structure according to claim 1,
A side sill extending along the vehicle front-rear direction is provided outside the front side frame in the vehicle width direction,
disposing an outrigger joined to a vehicle front end of the side sill on the inclined surface of the dashboard lower provided in front of the vehicle of the bent portion;
an inner frame connecting member joined to the vehicle front end of the front tunnel side frame is arranged on the opposite side of the outrigger with the front side frame interposed therebetween;
The vehicle body front structure, wherein the outriggers and the inner frame connecting members are arranged along the width direction of the vehicle. In the vehicle body front structure according to claim 1,
The vehicle body front portion structure, wherein the front side frame is configured in an arch shape with the bent portion as the apex when viewed from the bottom. In the vehicle body front structure according to claim 1,
A vehicle body front structure, wherein an axis-perpendicular section of the front side frame presents a vertically elongated rectangular shape on the front tunnel side frame side in the front half portion, and changes into a horizontally elongated rectangular shape toward the rear of the vehicle. In the vehicle body front structure according to claim 1,
the inclined surface of the dashboard lower has a floor joint portion joined to the floor panel outside the front tunnel side frame in the vehicle width direction;
having a tunnel joint portion joined to the tunnel portion on the inner side in the vehicle width direction of the front tunnel side frame;
The floor joint portion and the tunnel joint portion are arranged such that the tunnel joint portion is positioned in front of the vehicle, and the floor joint portion is positioned in the rear portion of the vehicle and are offset in the vehicle front-rear direction. Body front structure. In the vehicle body front structure according to claim 1,
The vehicle body front structure, wherein the inclined surface of the dashboard lower is continuously fixed to the front side frame along the longitudinal direction of the front side frame. In the vehicle body front structure according to claim 1,
The inclined surfaces of the dashboard lower are arranged on both sides in the vehicle width direction with the tunnel portion interposed therebetween,
The vehicle body front structure, wherein the vehicle rear ends of the front side frames and the vehicle rear ends of the front tunnel side frames each project from the vehicle rear end of the dashboard lower toward the vehicle rear. In the vehicle body front structure according to claim 1,
A vehicle body front structure, wherein a dashboard cross member is arranged along the vehicle width direction on the cabin side of the inclined surface of the dashboard lower. In the vehicle body front structure according to claim 1,
Disposing a dashboard cross member and an outrigger in front of the vehicle at the bent portion,
The vehicle body front structure, wherein the front side frame is supported by the dashboard cross member and the outrigger. In the vehicle body front structure according to claim 1,
The front side frame has an opening that opens upward and has a hat-shaped cross section perpendicular to the axis,
1. A vehicle body front structure, wherein a stepped portion having a stepped shape is provided on each of right and left side walls at a vehicle rear portion of said front side frame along said inclined surface of said dashboard lower.

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