JP2022168398A - Vehicle body front part structure - Google Patents

Abstract

To avoid an engine deformed toward a vehicle rear side at the time of input of a collision load from getting caught on a bent portion of each front side frame.SOLUTION: A vehicle body front part structure includes a power unit 34 disposed on an inner side in a vehicle width direction of each of front side frames 12. A slider surface 36 inclined to the inner side in the vehicle width direction toward a vehicle rear side is formed on a side surface of the power unit 34, which is located opposed to the front side frame 12. The front side frame 12 includes: a bent portion 50 bent so as to be located on an outer side in the vehicle with direction toward a vehicle front side as viewed from the bottom; and an inclined surface 52 disposed on the inner side in the vehicle width direction of the bent portion 50 and inclined to the inner side in the vehicle width direction toward the vehicle rear side. The slider surface 36 and the inclined surface 52 are disposed to be at least partially overlapped with each other in a vehicle front-rear direction as viewed in the vehicle width direction.SELECTED DRAWING: Figure 1

Description

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

For example, Japanese Laid-Open Patent Publication No. 2004-100001 discloses a technical concept in which, when a head-on collision load is input, the driving device slides down along a partition wall formed of an inclined surface that slopes downward toward the rear of the vehicle, thereby protecting the occupant. there is

Japanese Patent No. 2855411

By the way, in a vehicle in which a transversely mounted engine is mounted in an engine room in front of the vehicle, bent portions are provided in intermediate portions of the left and right front side frames so as to spread outward in the vehicle width direction compared to other portions.

When the transversely mounted engine retreats rearward of the vehicle due to the pressing force of the frontal collision load, the rear end of the transversely mounted engine is caught by the bent portions of the left and right front side frames, making it difficult to secure a desired crash stroke.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and is capable of avoiding the engine, which is displaced toward the rear of the vehicle, from being caught by the bent portions of the front side frames when a collision load is input. The purpose is to provide a part structure.

In order to achieve the above object, the present invention includes a front side frame extending in the vehicle front-rear direction, and a power unit disposed inside the front side frame in the vehicle width direction. On the vehicle rear end side of the side surface facing the side frame, there is formed a slider surface that slopes inward in the vehicle width direction toward the rear of the vehicle. A curved portion that is bent so as to be located on the outer side in the vehicle width direction as far as possible, and a slope that slopes toward the inner side in the vehicle width direction toward the rear of the vehicle is provided on the inner side of the curved portion in the vehicle width direction, The slider surface and the slope are arranged so that at least a part of them overlap in the vehicle front-rear direction when viewed in the vehicle width direction.

According to the present invention, it is possible to obtain a vehicle body front structure capable of avoiding the engine, which is displaced toward the rear of the vehicle, from being caught by the bent portions of the front side frames when a collision load is input.

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. 2 is a perspective view showing a slope provided on the inside in the vehicle width direction of the bent portion of the front side frame shown in FIG. 1 ; FIG. 4 is a cross-sectional view showing an inclined surface provided on the dashboard lower; It is an enlarged bottom view showing a floor skeleton mechanism connected to the front side frame. It is the perspective view which looked at the dashboard from the vehicle interior side. FIG. 4 is a side view showing a state where the front end portion of the front side frame and the front end portion of the lower member are connected; FIG. 6B is a cross-sectional view along line VI-VI of FIG. 6A; FIG. 4 is a side view showing a first reinforcing plate and a second reinforcing plate provided on the front side frame; 4 is a cross-sectional view of the front end portion of the front side frame; FIG. FIG. 4 is a partially broken perspective view showing a state in which the front end portions of the front side frames and the front end portions of the upper member are respectively connected by bumper beam extensions; FIG. 10 is a perspective view showing a state in which bumper beam extensions are removed from the state shown in FIG. 9; FIG. 4 is a partial imaginary side view showing a sub-frame provided below the vehicle of the front side frame; 12 is a bottom view showing the first protrusion, the second protrusion, etc. shown in FIG. 11; FIG. FIG. 11 is a bottom view showing a state in which a collision load is input from the front of the vehicle and the power unit has moved backward to the rear of the vehicle;

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 vehicle width direction outer side of each front side frame 12 and extending in the vehicle front-rear direction on the upper side, and a lower member 16 branching downward at the vehicle front end of each upper member 14. including.

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 an engine room 22 from the vehicle compartment. As shown in FIG. 5, 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 cloths 30 extending along the vehicle. The dashboard lower 28 faces the engine room 22 and has an inclined surface 32 that slopes downward from the front of the vehicle toward the rear of the vehicle (see FIG. 3).

As shown in FIG. 1, in the engine room 22, for example, a power unit 34 in which an engine and a transmission are integrally unitized and arranged side by side along the vehicle width direction is arranged. A slider surface 36 is provided at the rear end portion on one side of the power unit 34 . The slider surface 36 is formed of an inclined surface that slopes from the outside in the vehicle width direction toward the inside in the vehicle width direction from the vehicle front to the vehicle rear when viewed from the bottom.

In other words, a slider surface 36 that inclines inward in the vehicle width direction toward the rear of the vehicle is formed on the vehicle rear end side of the side surface of the engine or transmission that constitutes the power unit 34 that faces the front side frame 12 . there is

In this embodiment, the slider surface 36 is provided only on one side of the rear end portion of the power unit 34 in the vehicle width direction. good. Further, in this embodiment, a transverse engine is used as the engine, but the invention is not limited to this, and a longitudinal engine may be used.

As shown in FIG. 6B, the front side frame 12 has an opening 38 that opens outward in the vehicle width direction, and has a frame main body portion (main body portion) 40 having a substantially U-shaped cross section perpendicular to the axis. and a back plate 44 that closes the opening 38 of the main body 40 and forms a hollow body 42 that extends in the longitudinal direction of the vehicle. The frame body portion 40 is provided with an upper flange portion 46a and a lower flange portion 46b, and is joined to the back plate 44 via the upper flange portion 46a and the lower flange portion 46b.

As shown in FIG. 8, the front end side of the frame main body 40 includes an upper wall 48a provided on the ceiling surface, an inner wall 48b bent downward from the upper wall 48a and provided on the inner side in the vehicle width direction, and the inner wall 48b. has an inclined wall 48c continuous to the lower end of the . The back plate 44 connects the upper wall 48 a and the inclined wall 48 c of the frame main body 40 to form the hollow body 42 .

As shown in FIG. 1, the front end side of the front side frame 12 is provided with a bent portion 50 that bends so as to widen outward in the vehicle width direction (lower member 16 side) toward the front side. Further, the lower member 16 is bent so as to approach the vehicle width direction inner side (front side frame 12 side) toward the front side.

As shown in FIG. 2 , slopes 52 are provided on the vehicle width direction inner sides of the bent portions 50 of the front side frames 12 . When viewed from the side, the slope 52 inclines from the outside in the vehicle width direction to the inside in the vehicle width direction from the front to the rear of the vehicle. The slider surface 36 of the power unit 34 and the inclined surface 52 of the front side frame 12 are arranged so that at least a portion thereof overlaps along the vehicle front-rear direction when viewed in the vehicle width direction (see FIG. 1).

As shown in FIG. 1 , a floor frame mechanism 54 that has an L shape in bottom view and is connected to the front side frame 12 is arranged behind the vehicle on the slope 52 . As shown in FIG. 4, the floor frame mechanism 54 comprises a cross member 56 extending along the vehicle width direction, and a tunnel side frame 58 having a hat-shaped axial cross section and extending toward the rear of the vehicle. It is configured. A vehicle width direction outer end of the cross member 56 is connected to a vehicle front end of a rear end 60 of the front side frame 12 . A vehicle width direction inner end of the cross member 56 is connected to a vehicle front end of the tunnel side frame 58 .

The floor frame mechanism 54 is arranged on the inclined surface 32 (see FIG. 3) of the dashboard lower 28 facing the engine room 22 . Further, the floor frame mechanism 54 is continuously fixed (bonded) to the inclined surface 32 of the dashboard lower 28 together with 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. 7, at the vehicle rear portion of the front side frame 12, a first reinforcing plate 62 having an L-shaped cross-section perpendicular to the axis is superimposed on the inner lower ridgeline of the front side frame 12 and extends along the longitudinal direction. is provided. A second reinforcing plate 64 is provided at the vehicle front portion of the front side frame 12 so as to be offset outward in the vehicle width direction toward the front end. A vehicle front end 62a of the first reinforcing plate 62 and a vehicle rear end 64a of the second reinforcing plate 64 are aligned along the vehicle front-rear direction.

That is, as shown in FIG. 7, the vehicle rear end 64a of the second reinforcing plate 64 arranged in the vehicle front portion and the vehicle front end 62a of the first reinforcing plate 62 arranged in the vehicle rear portion are arranged in the vehicle front-rear direction. are arranged side by side in contact with each other. In the present embodiment, the first reinforcing plate 62 having an L-shaped axial cross section is used, but the present invention is not limited to this. may be used.

As shown in FIG. 8 , the second reinforcing plate 64 is inclined outward in the vehicle width direction from the inner wall of the frame body portion 40 of the front side frame 12 toward the front of the vehicle, and has a closed cross section 66 between itself and the back plate 44 . constitutes The space including the closed cross-section 66 continues (communicates) with the hollow body 42 on the vehicle rear side formed by the frame main body 40 and the back plate 44 .

9 and 10, the vehicle front end of the second reinforcing plate 64 is aligned in the vehicle front-rear direction with the wall surface 70 of the bumper beam extension 68 provided at the vehicle front end of the front side frame 12. is doing. As shown in FIG. 9, the wall surface 70 is configured to divide the interior of the cylindrical bumper beam extension 68 into left and right sides. Furthermore, the material or cross-sectional shape of the first reinforcing plate 62 can be changed according to the weight of the vehicle body.

As shown in FIG. 11, a sub-frame 72 is arranged below each front side frame 12 of the vehicle. The sub-frames 72 have, for example, a parallelepiped shape when viewed from the bottom, and include a pair of left and right vertical frames extending along the vehicle front-rear direction, and a pair of left and right vertical frames extending along the vehicle width direction and connecting the pair of left and right vertical frames. and a lateral frame.

The sub-frame 72 is attached to each front side frame 12 by a front fastening portion 74 and a rear fastening portion 76 arranged in the longitudinal direction of the vehicle.

Also, the sub-frame 72 is provided with a front fastening portion 74 having a first projection 78a, a steering gear box element 80 having a second projection 78b, and a rear fastening portion 76 having a third projection 78c. ing. Further, the front side frames 12 and the floor frame mechanism 54 are brought into contact with the first convex portion 78a, the second convex portion 78b, and the third convex portion 78c when a frontal collision load is input, and the sub-frame 72 is moved. It has a first slide portion 82a, a second slide portion 82b, and a third slide portion 82c that guide the vehicle downward (see FIG. 11).

As shown in FIG. 11, the first slide portion 82a, the second slide portion 82b, and the third slide portion 82c are respectively the first protrusion 78a, the second protrusion 78b, and the third protrusion 78c. is located at the rear of the vehicle, and is composed of an inclined surface that slopes downward from the upper side of the vehicle toward the rear side of the vehicle from the front side of the vehicle. This inclined surface has a function of guiding the sub-frame 72 downward of the vehicle when a frontal collision load is applied.

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 the present embodiment, a slider surface 36 is formed on the vehicle rear end side of the side surface of the power unit 34 facing the front side frame 12 so as to incline inward in the vehicle width direction toward the rear of the vehicle. The front side frame 12 has a bent portion 50 that bends so as to be positioned outward in the vehicle width direction toward the front of the vehicle when viewed from the bottom. A slope 52 is formed on the inner side of the bent portion 50 in the vehicle width direction and is inclined toward the inner side of the vehicle toward the rear of the vehicle. The slider surface 36 and the slope 52 are arranged so that at least a part thereof overlaps in the vehicle front-rear direction when viewed in the vehicle width direction.

In this embodiment, when a collision load F is input from the front of the vehicle and the power unit 34 retreats to the rear of the vehicle, the slider surface 36 slides on the slope 52 on the inner side of the bent portion 50 of the front side frame 12 in the vehicle width direction, causing the power unit 34 to slide. Furthermore, the vehicle can be moved backward (see FIG. 13). As a result, in the present embodiment, the power unit 34 can be prevented from being caught by the bent portion 50 of the front side frame 12, and the crash stroke at which the front side frame 12 is deformed can be increased.

In addition, in the present embodiment, a floor frame mechanism 54 that is connected to the front side frame 12 and has an L shape when viewed from the bottom is arranged behind the vehicle on the slope 52 . In this embodiment, the floor frame mechanism 54 can prevent the power unit 34 from moving backward when the collision load F is input, and can preferably prevent the power unit 34 from entering the vehicle interior.

Furthermore, in this embodiment, the floor frame mechanism 54 is arranged on the inclined surface 32 of the dashboard lower 28 on the engine room 22 side. As a result, in this embodiment, the power unit 34 can be restrained from retreating by the inclined surface 32 of the dashboard lower 28 when the collision load F is input, and the power unit 34 can be preferably prevented from entering the vehicle compartment.

Furthermore, in this embodiment, the floor skeleton mechanism 54 is continuously fixed to the inclined surface 32 of the dashboard lower 28 together with the front side frame 12 . As a result, in the present embodiment, the joint between the floor frame mechanism 54 and the dashboard 24 can be strengthened to reliably prevent the power unit 34 from retreating.

Furthermore, in this embodiment, a dashboard cloth 30 is arranged along the vehicle width direction on the interior side of the inclined surface 32 of the dashboard lower 28 . In this embodiment, the dashboard cloth 30 reinforces the rigidity and strength of the dashboard 24, so that frontal collision performance when a collision load is input from the front of the vehicle can be improved.

Furthermore, in this embodiment, a sub-frame 72 is arranged below the front side frame 12 . The subframe 72 includes a front fastening portion 74 having a first projection 78a, a steering gear box element 80 having a second projection 78b, and a rear fastening portion 76 having a third projection 78c. It is The front side frame 12 and the floor skeleton mechanism 54 are provided with a first slide portion 82a, a second slide portion 82b and a third slide portion corresponding to the first protrusion 78a, the second protrusion 78b and the third protrusion 78c, respectively. 82c.

When a frontal collision load (flat collision load) is input, the subframe 72 is pressed by the retreating power unit 34, the front fastening portion 74 and the rear fastening portion 76 are separated from the vehicle body, and the first convex portion 78a and the second convex portion 78a are separated from each other. The portion 78b and the third convex portion 78c slide down sequentially or continuously by the first slide portion 82a, the second slide portion 82b and the third slide portion 82c, so that the entire sub-frame 72 slides down toward the floor. there is In particular, even if the sub-frame 72 has a complicated concave-convex shape, the sub-frame 72 will continue to slide down during the whole process of a head-on collision because one of the projections slides down on one of the slides while the sub-frame 72 slides down. can slide off.

Furthermore, in the present embodiment, at the vehicle rear portion of the front side frame 12, a first reinforcing plate 62 having an L-shaped axial perpendicular section is superimposed on the inner lower ridge line of the front side frame 12 and extends along the longitudinal direction. is provided. A second reinforcing plate 64 is provided at the vehicle front portion of the front side frame 12 so as to be offset outward in the vehicle width direction toward the front of the vehicle. The first reinforcing plate 62 and the second reinforcing plate 64 are arranged in alignment along the vehicle front-rear direction.

In this embodiment, the minute wrap collision load is transmitted from the second reinforcing plate 64 to the first reinforcing plate 62 . Thus, in the present embodiment, the front side frame 12 deforms together with the first reinforcing plate 62, so that the minute lap collision load can be absorbed.

Furthermore, in the present embodiment, the front side frame 12 includes a frame main body portion 40 having a substantially U-shaped cross section having an opening 38 on the outside in the vehicle width direction, and a frame main body portion 40 that closes the opening 38 in the vehicle front-rear direction. and a back plate 44 forming an elongated hollow body 42 . The second reinforcing plate 64 is inclined outward in the vehicle width direction from the inner wall of the frame body 40 toward the front of the vehicle, and forms a closed cross section 66 with the back plate 44 . The space surrounded by the closed cross section 66 continues (communicates) with the hollow body 42 at the rear portion of the front side frame 12 .

As a result, in the present embodiment, a small wrap collision load is transmitted from the closed cross-section 66 at the front portion of the front side frame 12 to the hollow body 42 at the rear portion, and deformation of the rear portion of the front side frame 12 can be accelerated.

Furthermore, in the present embodiment, the vehicle front end portion of the second reinforcing plate 64 is aligned in the vehicle front-rear direction with the wall surface 70 of the bumper beam extension 68 provided at the vehicle front end portion of the front side frame 12 .

As a result, when a minute wrap collision load is input, the minute wrap collision load is transmitted from the wall surface 70 of the bumper beam extension 68 to the frame body portion 40 of the front side frame 12 via the second reinforcing plate 64 . As a result, in the present embodiment, deformation of the ridgelines (upper ridgelines and lower ridgelines) of the front side frames 12 can be facilitated.

Furthermore, in this embodiment, the material or cross-sectional shape of the first reinforcing plate 62 can be changed according to the weight of the vehicle body. The first reinforcing plate 62 can change the strength of the front side frame 12 while maintaining the same plate thickness. The same front side frame 12 can be applied to .

REFERENCE SIGNS LIST 10 vehicle body front 12 front side frame 28 dashboard lower 30 dashboard cloth 32 inclined surface 34 power unit 36 slider surface 38 opening 40 frame main body (main body)
42 hollow body 44 back plate 48a upper wall 48b inner wall 48c inclined wall 50 bent portion 52 slope 54 floor skeleton mechanism 62 first reinforcing plate 64 second reinforcing plate 66 closed section 68 bumper beam extension 70 wall surface 72 subframe 74 front fastening portion 76 Rear fastening portion 78a First convex portion 78b Second convex portion 78c Third convex portion 80 Steering gear box element 82a First slide portion 82b Second slide portion 82c Third slide portion F Collision load

Claims (9)

a front side frame extending in the longitudinal direction of the vehicle;
a power unit arranged inside the front side frame in the vehicle width direction,
A slider surface is formed on a vehicle rear end side of a side surface of the power unit facing the front side frame, the slider surface being inclined inward in the vehicle width direction toward the rear of the vehicle,
The front side frame has a bent portion that bends so as to be positioned outward in the vehicle width direction toward the front of the vehicle when viewed from the bottom,
A slope is provided on the inner side of the bending portion in the vehicle width direction so as to be inclined toward the inner side in the vehicle width direction toward the rear of the vehicle,
The vehicle body front structure, wherein the slider surface and the inclined surface are arranged such that at least a portion thereof overlaps in the vehicle front-rear direction when viewed in the vehicle width direction. In the vehicle body front structure according to claim 1,
A vehicle body front structure, wherein an L-shaped floor skeleton mechanism connected to the front side frame when viewed from the bottom is arranged on the vehicle rear of the slope. In the vehicle body front structure according to claim 2,
The vehicle body front structure, wherein the floor frame mechanism is arranged on the inclined surface of the dashboard lower. In the vehicle body front structure according to claim 3,
The vehicle body front structure, wherein the floor frame mechanism is continuously fixed to the inclined surface of the dashboard lower together with the front side frame. In the vehicle body front structure according to claim 1,
A vehicle body front structure, wherein a dashboard cloth is arranged along the vehicle width direction on the vehicle interior side of the inclined surface of the dashboard lower. In the vehicle body front structure according to claim 1,
A subframe is arranged below the front side frame,
The subframe has a front fastening portion having a first projection, a steering gearbox element having a second projection, and a rear fastening portion having a third projection,
The front side frame and the floor frame member have a first slide portion, a second slide portion, and a third slide portion corresponding to the first protrusion, the second protrusion, and the third protrusion, respectively;
When a frontal collision load is input, the first protrusion, the second protrusion and the third protrusion slide down continuously on the first slide, the second slide and the third slide. A vehicle body front structure characterized by: In the vehicle body front structure according to claim 1,
A first reinforcing plate having an L-shaped axial cross-section or a U-shaped axial cross-section is provided at the vehicle rear portion of the front side frame along the longitudinal direction so as to overlap the inner ridge line of the front side frame,
A second reinforcing plate offset outward in the vehicle width direction toward the front of the vehicle is provided at the vehicle front portion of the front side frame,
The vehicle body front structure, wherein the first reinforcing plate and the second reinforcing plate are arranged in alignment along the vehicle front-rear direction. In the vehicle body front structure according to claim 7,
The front side frame is composed of a main body portion having a substantially U-shaped cross-section having an opening on the outside in the vehicle width direction, and a back plate presenting a hollow body extending in the vehicle front-rear direction and closing the opening of the main body portion,
The second reinforcing plate is inclined outward in the vehicle width direction from the inner wall of the main body toward the front of the vehicle, and forms a closed cross section with the back plate,
The vehicle body front structure, wherein the closed section is continuous with the hollow body. In the vehicle body front structure according to claim 7,
The vehicle body front structure, wherein the second reinforcing plate is aligned with the wall surface of the bumper beam extension in the longitudinal direction of the vehicle.

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