JP7063193B2 - Vehicle front structure - Google Patents

Description

The present invention relates to a vehicle front structure.

A structure is known in which a dash cross member is provided on the rear side of the front side member in the front part of the vehicle (see Patent Documents 1 to 4). For example, Patent Document 1 below discloses a structure in which a pair of left and right front side members are connected to each other by a dash cross member. Briefly, in this prior art, the lower part of the rear end side of the front side member is inclined toward the lower side of the vehicle and extends toward the rear side of the vehicle, and the dash cross member is joined to the tip portion thereof.

Chinese Patent Publication No. 106005013 Japanese Unexamined Patent Publication No. 2001-171556 Japanese Patent Application Laid-Open No. 2003-191862 Japanese Unexamined Patent Publication No. 2001-030961

However, in the above-mentioned prior art, since the dash cross member is arranged on the lower side of the vehicle than the portion extending along the vehicle front-rear direction in the front side member, the collision load is effectively applied from the front side member to the dash cross member at the time of a frontal collision. Cannot be communicated.

In consideration of the above facts, it is an object of the present invention to obtain a vehicle front structure capable of effectively transmitting a collision load from a front side member to a dash cross member in the event of a frontal collision.

The vehicle front structure of the present invention according to claim 1 is arranged outside the vehicle front portion in the vehicle width direction, and has a front side member extending along the vehicle front-rear direction and a vehicle rear side of the front side member. The front side member has a dash cross member arranged adjacent to the vehicle and extended along the vehicle width direction, and the front side member is a corner formed by an upper wall portion, a lower wall portion, and a pair of left and right side wall portions. The dash cross member includes a tubular portion and a partition wall portion that separates the internal space of the square tubular portion in the vehicle vertical direction, and the dash cross member has a closed cross-sectional structure portion extending along the vehicle width direction, and the closed portion is provided. The cross-sectional structure includes a front wall portion that constitutes the front surface of the dash cross member, a rear wall portion that constitutes the rear surface of the dash cross member and is arranged so as to face the front wall portion in the front-rear direction of the vehicle. The first wall portion, the second wall portion, and the third wall, which are juxtaposed in the vehicle vertical direction and connect the front wall portion and the rear wall portion , respectively, and extend along the vehicle front-rear direction in the vehicle side view, respectively. The first wall portion includes a portion , the outer portion in the vehicle width direction is arranged on the rear side of the vehicle of the upper wall portion, and the front end is set at the height position of the rear end of the upper wall portion. In the second wall portion, a portion outside in the vehicle width direction is arranged on the vehicle rear side of the partition wall portion, the front end is set at the height position of the rear end of the partition wall portion, and the third wall portion is the vehicle width. The portion outside the direction is arranged on the rear side of the vehicle on the lower wall portion, and the front end is set at the height position of the rear end of the lower wall portion.

According to the above configuration, the dash cross member extending along the vehicle width direction is arranged adjacent to the vehicle rear side of the front side member extending along the vehicle front-rear direction. Therefore, the collision load input to the front side member at the time of frontal collision is transmitted to the dash cross member.

Further, in the closed cross-sectional structure portion extending along the vehicle width direction in the dash cross member, the front wall portion constituting the front surface of the dash cross member and the front wall portion constituting the rear surface of the dash cross member and the vehicle. The rear wall parts arranged facing each other in the front-rear direction and the front wall parts and the rear wall parts arranged side by side in the vertical direction of the vehicle are connected to each other and extended along the front-rear direction of the vehicle from the side view of the vehicle. One wall part, a second wall part and a third wall part are included. Here, in the first wall portion, the outer portion in the vehicle width direction is arranged on the vehicle rear side of the upper wall portion of the front side member, and the front end is set at the height position of the rear end of the upper wall portion of the front side member. ing. Therefore, a part of the collision load at the time of a frontal collision is satisfactorily transmitted from the upper wall portion of the front side member to the first wall portion of the dash cross member. Further, in the second wall portion, the outer portion in the vehicle width direction is arranged on the rear side of the vehicle partition portion of the front side member, and the front end is set at the height position of the rear end of the partition wall portion of the front side member. Therefore, a part of the collision load at the time of a frontal collision is satisfactorily transmitted from the partition wall portion of the front side member to the second wall portion of the dash cross member. Further, in the third wall portion, the outer portion in the vehicle width direction is arranged on the vehicle rear side of the lower wall portion of the front side member, and the front end is set at the height position of the rear end of the lower wall portion of the front side member. There is. Therefore, a part of the collision load at the time of a frontal collision is satisfactorily transmitted from the lower wall portion of the front side member to the third wall portion of the dash cross member.

The vehicle front structure of the present invention according to claim 2 is arranged inside the vehicle width direction with respect to the front side member in the configuration according to claim 1, and at least a part thereof is below the vehicle front side with respect to the front side member. The dash cross member is provided with a power unit facing portion facing the power unit in the vehicle front-rear direction at an intermediate portion in the vehicle width direction of the closed cross-section structure portion, and the power unit facing portion in the closed cross-section structure portion. The range including the portion is configured as a continuum of a plurality of closed cross-sectional portions having a triangular shape when viewed from the side of the vehicle. The "triangular shape" here includes the shape of a triangle in a strict sense, and is not strictly a triangle, for example, a shape in which the corners of a triangle are chamfered. It also includes shapes that look like triangles when viewed as a whole. Further, the "continuum of a plurality of closed cross-section portions" refers to a continuous body in which a plurality of closed cross-section portions are continuously formed.

According to the above configuration, the dash cross member includes a power unit and a power unit facing portion facing the vehicle in the front-rear direction in the middle portion in the vehicle width direction of the closed cross-sectional structure portion. Therefore, when the power unit that has received the collision load at the time of a frontal collision moves to the rear side of the vehicle, the power unit comes into contact with the power unit facing portion of the dash cross member. Here, the range including the power unit facing portion in the closed cross-section structure portion is configured as a continuum of a plurality of closed cross-section portions having a triangular shape when viewed from the side of the vehicle. Therefore, even if the power unit moved to the rear side of the vehicle comes into contact with the power unit facing portion of the dash cross member, the deformation of the dash cross member is suppressed, and the displacement of the power unit and the dash cross member to the vehicle interior side is effectively suppressed. Will be.

As described above, according to the vehicle front structure of the present invention, there is an excellent effect that the collision load can be effectively transmitted from the front side member to the dash cross member at the time of a frontal collision.

It is a top view which simplifies the vehicle front structure which concerns on one Embodiment of this invention. It is a perspective view which shows a part of the skeleton part of the vehicle front structure of FIG. It is an enlarged vertical sectional view which shows the state which cut along the 3-3 line of FIG. 1 in an enlarged manner. It is an enlarged vertical sectional view which shows the state which cut along the 4-4 line of FIG. 1 in an enlarged manner.

The vehicle front structure according to the embodiment of the present invention will be described with reference to FIGS. 1 to 4. In these figures, the arrow FR appropriately shown indicates the front side of the vehicle, the arrow UP indicates the upper side of the vehicle, and the arrow W indicates the width direction of the vehicle. Further, as the vehicle of the present embodiment, an electric vehicle is applied as an example.

(Structure of Embodiment)
FIG. 1 shows a simplified plan view of the vehicle front structure according to the present embodiment. As shown in FIG. 1, a bumper reinforcement 14 (hereinafter, abbreviated as "bumper RF14") extending along the vehicle width direction is arranged on the front end side of the vehicle body front portion 10. The bumper RF14 has a closed cross-sectional structure extending along the vehicle width direction.

Further, on the outer side of the front portion 10 of the vehicle body in the vehicle width direction, the front side member 20 is arranged on the rear side of the vehicle with respect to the portion of the bumper RF 14 outside in the vehicle width direction. The front side member 20 is provided symmetrically in the front portion 10 of the vehicle body and extends along the front-rear direction of the vehicle. In this embodiment, the front end portion of the front side member 20 is directly joined to the bumper RF14. The front end portion of the front side member 20 may be joined to the bumper RF14 via an intervening member such as a crash box.

The front side member 20 is made of an aluminum alloy (in a broad sense, made of metal) as an example, and is an extruded product formed into a substantially constant cross-sectional shape by extrusion molding of an aluminum alloy material. FIG. 2 is a perspective view showing a part of the skeleton portion of the vehicle front structure. As shown in FIG. 2, the front side member 20 includes a square tube portion 20X formed by an upper wall portion 22, a lower wall portion 24, and a pair of left and right side wall portions 26. The upper wall portion 22 and the lower wall portion 24 are arranged substantially parallel to each other so as to face each other in the vertical direction of the vehicle, and extend along the front-rear direction of the vehicle and extend along the width direction of the vehicle. The pair of left and right side wall portions 26 connect the outer ends of the upper wall portion 22 and the lower wall portion 24 in the vehicle width direction and the inner ends in the vehicle width direction in the vehicle vertical direction, and are connected in the vehicle front-rear direction. It is extended along. Further, the front side member 20 includes a partition wall portion 28 that separates the internal space of the square cylinder portion 20X in the vertical direction of the vehicle. The partition wall portion 28 extends along the vehicle front-rear direction and extends along the vehicle width direction.

As shown in FIG. 1, a suspension member 52 is attached to the front side member 20 in a suspended state. Further, the power unit 50 is arranged inside the front side member 20 in the vehicle width direction. In the present embodiment, the power unit 50 includes a motor and does not include an engine, and is attached to a suspension member 52 as an example. FIG. 4 shows an enlarged vertical sectional view of the state cut along the line 4-4 of FIG. 1. In addition, in FIG. 4, the position of the front side member 20 on the right side of the vehicle from the cutting position of the 4-4 line of FIG. 1 is shown by a two-dot chain line. Further, in FIG. 4, the power unit 50 is shown in a simplified manner. As shown in FIG. 4, the power unit 50 is located on the lower side of the vehicle with respect to the front side member 20.

On the other hand, FIG. 3 shows an enlarged vertical sectional view of a state cut along the line 3-3 of FIG. 1. As shown in FIGS. 1 to 3, a dash cross member 30 is adjacent to the rear side of the front side member 20 on the vehicle rear side, and the dash cross member 30 extends along the vehicle width direction. Has been done.

The dash cross member 30 is made of an aluminum alloy (in a broad sense, made of metal) as an example, and is an extruded product formed into a substantially constant cross-sectional shape (see FIGS. 3 and 4) by extrusion molding of an aluminum alloy material. ing. The dash cross member 30 has a closed cross-section structure 30X (see FIGS. 3 and 4) extending along the vehicle width direction. Further, as shown in FIG. 3, the dash cross member 30 includes an upper flange portion 30A extending from the upper rear end portion of the closed cross-section structure portion 30X to the upper side of the vehicle, and is below the closed cross-section structure portion 30X. It is provided with a lower flange portion 30B extending from the rear end portion to the rear side of the vehicle. The upper flange portion 30A is joined to the lower end portion of the dash panel 18 separating the power unit chamber 12 and the vehicle compartment 60, and the lower flange portion 30B is joined to the front end portion of the floor panel 62 constituting the bottom portion of the vehicle compartment 60. There is.

The closed cross-section structure portion 30X includes a front wall portion 32 and a rear wall portion 34, and has a first wall portion 36 and a second wall portion 38 which are a plurality of connecting wall portions connecting the front wall portion 32 and the rear wall portion 34. , A third wall portion 40, a fourth wall portion 42, a fifth wall portion 44, a sixth wall portion 46, and a seventh wall portion 48. The front wall portion 32 and the rear wall portion 34 are arranged so as to face each other in the front-rear direction of the vehicle and substantially parallel to each other. Further, the upper end portion of the front wall portion 32 and the upper end portion of the rear wall portion 34 are connected by the first wall portion 36, and the lower end portion of the front wall portion 32 and the lower end portion of the rear wall portion 34 are connected to the seventh wall portion 48. Connected by. Then, in the space surrounded by the front wall portion 32, the rear wall portion 34, the first wall portion 36, and the seventh wall portion 48, the second wall portion 38, the third wall portion 40, the fourth wall portion 42, and the fifth wall portion are formed. A portion 44 and a sixth wall portion 46 (hereinafter, abbreviated as “second wall portion 38 to sixth wall portion 46”) are formed. The second wall portion 38 to the sixth wall portion 46 are constituent parts that can be grasped as ribs.

The upper portion 32A of the front wall portion 32 and the upper portion 34A of the rear wall portion 34 are arranged at the same height positions as the front side member 20. The entire area of the upper portion 32A of the front wall portion 32 and the upper half 34A1 of the upper portion 34A of the rear wall portion 34 extend along the vehicle vertical direction in the vehicle side view. The inclined portions 32B and 34B constituting the front wall portion 32 and the rear wall portion 34 on the lower side of the vehicle with respect to the upper portions 32A and 34A are inclined toward the rear side of the vehicle toward the lower side of the vehicle. Further, the lower half 34A2 of the upper portion 34A of the rear wall portion 34 is curved in a vehicle side view so as to gently connect the upper half 34A1 of the upper half 34A of the rear wall portion 34 and the inclined portion 34B of the rear wall portion 34. ..

The first wall portion 36, the second wall portion 38, and the third wall portion 40 are arranged side by side in the vertical direction of the vehicle, and extend along the front-rear direction of the vehicle in the side view of the vehicle. In the present embodiment, as an example, the first wall portion 36 is slightly inclined toward the rear side of the vehicle toward the upper side of the vehicle. In the first wall portion 36, the outer portion in the vehicle width direction is arranged on the vehicle rear side of the upper wall portion 22 of the front side member 20, and the front end 36F is the height of the rear end 22R of the upper wall portion 22 of the front side member 20. It is set to the position. Further, in the second wall portion 38, a portion outside in the vehicle width direction is arranged on the vehicle rear side of the partition wall portion 28 of the front side member 20, and the front end 38F is the height of the rear end 28R of the partition wall portion 28 of the front side member 20. It is set to the position. Further, in the third wall portion 40, a portion outside the vehicle width direction is arranged on the vehicle rear side of the lower wall portion 24 of the front side member 20, and the front end 40F is the rear end 24R of the lower wall portion 24 of the front side member 20. It is set to the height position. The closed cross-section structure portion 30X has two closed cross-section portions 30S by the upper portion 32A of the front wall portion 32, the upper portion 34A of the rear wall portion 34, the first wall portion 36, the second wall portion 38, and the third wall portion 40. (In other words, a cross-sectional portion having a hollow closed space) is continuously formed up and down.

Further, the fourth wall portion 42 connects the vertical intermediate portion of the inclined portion 32B of the front wall portion 32 and the lower near portion of the portion of the rear wall portion 34 to which the third wall portion 40 is connected. , The vehicle is tilted upward toward the rear side of the vehicle when viewed from the side of the vehicle. The fifth wall portion 44 connects the lower vicinity portion of the portion of the front wall portion 32 to which the fourth wall portion 42 is connected and the vertical intermediate portion of the inclined portion 34B of the rear wall portion 34, and is a vehicle. It extends along the front-rear direction of the vehicle when viewed from the side. The sixth wall portion 46 connects the lower end portion of the front wall portion 32 and the lower vicinity portion of the portion of the rear wall portion 34 to which the fifth wall portion 44 is connected, and is connected to the rear side of the vehicle when viewed from the side of the vehicle. It is tilted toward the upper side of the vehicle. Further, the seventh wall portion 48 connecting the lower end portion of the front wall portion 32 and the lower end portion of the rear wall portion 34 extends along the vehicle front-rear direction in the vehicle side view. In the present embodiment, the rear end of the third wall portion 40 and the upper end of the fourth wall portion 42 are separated from each other, and the lower end of the fourth wall portion 42 and the front end of the fifth wall portion 44 are separated from each other. Although the rear end of the wall portion 44 and the upper end of the sixth wall portion 46 are separated from each other, they may be in contact with each other without being separated from each other.

As shown in FIG. 4, the dash cross member 30 includes a power unit 50 and a power unit facing portion 30T facing in the vehicle front-rear direction in the middle portion of the closed cross-section structure portion 30X in the vehicle width direction. The range including the power unit facing portion 30T in the closed cross-section structure portion 30X is the inclined portion 32B of the front wall portion 32, the inclined portion 34B of the rear wall portion 34, the third wall portion 40, the fourth wall portion 42, and the fifth wall portion 44. , The sixth wall portion 46 and the seventh wall portion 48 are configured (in a truss shape) as a continuum 30R of a plurality of triangular closed cross-sectional portions 30H (in other words, a cross-sectional portion having a hollow closed space) when viewed from the side of the vehicle. Has been done.

As shown in FIGS. 2 and 3, a connecting member 54 for connecting the front side member 20 and the dash cross member 30 is provided on the rear side of the front side member 20. As an example, the connecting member 54 is a cast product (in other words, made of die-cast) made of an aluminum alloy material. As an example, the connecting member 54 covers the rear portion of the front side member 20 over the entire circumference and is joined to the upper and lower surfaces and the side surface of the rear portion of the front side member 20. Further, in the connecting member 54, a portion extending from the rear end side of the portion covering the rear portion of the front side member 20 is joined to a portion outside the vehicle width direction of the dash cross member 30.

(Action / effect of embodiment)
Next, the operation and effect of the above embodiment will be described.

The collision load at the time of a frontal collision is input to the front side member 20 from the bumper RF14 shown in FIG. Further, in the present embodiment, since the dash cross member 30 is arranged adjacent to the vehicle rear side of the front side member 20, the collision load input to the front side member 20 at the time of a frontal collision is transmitted to the dash cross member 30. Will be done.

Further, in the present embodiment, the closed cross-sectional structure portion 30X shown in FIG. 3 extending along the vehicle width direction in the dash cross member 30 is juxtaposed in the vehicle vertical direction and is located in front of and behind the vehicle in the vehicle side view. A first wall portion 36, a second wall portion 38, and a third wall portion 40 extending along the direction are included. Here, in the first wall portion 36, a portion outside in the vehicle width direction is arranged on the vehicle rear side of the upper wall portion 22 of the front side member 20, and the front end 36F is the rear end 22R of the upper wall portion 22 of the front side member 20. It is set to the height position of. Therefore, a part of the collision load at the time of a frontal collision is satisfactorily transmitted from the upper wall portion 22 of the front side member 20 to the first wall portion 36 of the dash cross member 30. Further, in the second wall portion 38, the outer portion in the vehicle width direction is arranged on the vehicle rear side of the partition wall portion 28 of the front side member 20, and the front end 38F is the height of the rear end 28R of the partition wall portion 28 of the front side member 20. It is set to the position. Therefore, a part of the collision load at the time of a frontal collision is satisfactorily transmitted from the partition wall portion 28 of the front side member 20 to the second wall portion 38 of the dash cross member 30. Further, in the third wall portion 40, a portion outside the vehicle width direction is arranged on the vehicle rear side of the lower wall portion 24 of the front side member 20, and the front end 40F is the rear end 24R of the lower wall portion 24 of the front side member 20. It is set to the height position. Therefore, a part of the collision load at the time of a frontal collision is satisfactorily transmitted from the lower wall portion 24 of the front side member 20 to the third wall portion 40 of the dash cross member 30.

By providing the first wall portion 36, the second wall portion 38, and the third wall portion 40 described above, the collision from the front side member 20 is suppressed while the cross-sectional deformation (cross-sectional collapse) of the dash cross member 30 is suppressed at the time of a frontal collision. The load can be effectively received by the dash cross member 30. Further, in the first wall portion 36, the second wall portion 38, and the third wall portion 40, the collision load is satisfactorily transmitted to the rear side of the vehicle.

As described above, according to the vehicle front structure of the present embodiment, the collision load can be effectively transmitted from the front side member 20 to the dash cross member 30 at the time of a frontal collision.

Further, in the present embodiment, the front side member 20 can be efficiently deformed to absorb the collision energy by suppressing the cross-sectional deformation of the dash cross member 30 at the time of a frontal collision.

Further, in the present embodiment, the dash cross member 30 includes a power unit 50 and a power unit facing portion 30T facing in the vehicle front-rear direction in the vehicle width direction intermediate portion of the closed cross-section structure portion 30X shown in FIG. Therefore, when the power unit 50 that has received the collision load at the time of a frontal collision moves to the rear side of the vehicle, the power unit 50 comes into contact with the power unit facing portion 30T of the dash cross member 30 as shown by the two-dot chain line in FIG.

Here, the range including the power unit facing portion 30T in the closed cross-section structure portion 30X is configured as a continuous body 30R of a plurality of closed cross-section portions 30H having a triangular shape when viewed from the side of the vehicle. Therefore, even if the power unit 50 moved to the rear side of the vehicle comes into contact with the power unit facing portion 30T of the dash cross member 30, the deformation of the dash cross member 30 is suppressed. Therefore, the power unit 50 is received by the dash cross member 30, and the displacement of the power unit 50 and the dash cross member 30 toward the vehicle interior 60 side is effectively suppressed.

(Supplementary explanation of the embodiment)
In the above embodiment, the entire power unit 50 is located below the front side member 20 of the vehicle, but as a modification of the above embodiment, a part of the power unit is located below the front side member (20). A configuration located on the lower side can also be adopted.

Further, in the above embodiment, the dash cross member 30 includes the power unit facing portion 30T, but as a modification of the above embodiment, the dash cross member does not have a portion corresponding to the power unit facing portion 30T of the above embodiment. obtain. Further, in the above embodiment, the range including the power unit facing portion 30T in the closed cross-section structure portion 30X is configured as a continuous body 30R of a plurality of triangular closed cross-section portions 30H in the vehicle side view, but in the vehicle side view. It is also possible to adopt a configuration that does not include the continuous body 30R of a plurality of triangular closed cross-sectional portions 30H.

Further, in the above embodiment, the power unit 50 is configured not to include an engine and includes a motor, but the power unit may be configured to include an engine and a motor, or may be configured not to include a motor and to include an engine. It may be composed of.

The above-described embodiment and the above-mentioned modification can be combined and implemented as appropriate.

Although an example of the present invention has been described above, the present invention is not limited to the above, and it is needless to say that the present invention can be variously modified and implemented within a range not deviating from the gist thereof. ..

10 Front side of vehicle body 20 Front side member 20X Square tube 22 Upper wall 22R Rear end of upper wall 24 Lower wall 24R Rear end of lower wall 26 Side wall 28 Partition 28R Rear end of partition 30 Dash cross member 30H Closed section 30R Continuum 30T Power unit facing part 30X Closed section structure
32 Front wall
34 Rear wall
36 First wall part 36F Front end of first wall part 38 Second wall part 38F Front end of second wall part 40 Third wall part 40F Front end of third wall part 50 Power unit

Claims (2)

The front side member, which is located outside the vehicle width direction at the front of the vehicle body and extends along the vehicle front-rear direction,
A dash cross member arranged adjacent to the vehicle rear side of the front side member and extending along the vehicle width direction, and a dash cross member.
Have,
The front side member includes a square cylinder portion formed by an upper wall portion, a lower wall portion, and a pair of left and right side wall portions, and a partition wall portion that separates the internal space of the square cylinder portion in the vertical direction of the vehicle.
The dash cross member has a closed cross-sectional structure portion extending along the vehicle width direction, and the closed cross-sectional structure portion includes a front wall portion constituting the front surface of the dash cross member and the dash cross member. The rear wall portion that constitutes the rear surface and is arranged so as to face the front wall portion in the front-rear direction of the vehicle and the rear wall portion that is arranged side by side in the vertical direction of the vehicle to connect the front wall portion and the rear wall portion, respectively, and the side surface of the vehicle. A first wall portion, a second wall portion, and a third wall portion extending in the front-rear direction of the vehicle are included, respectively, and the first wall portion has a portion outside the vehicle width direction as the upper wall. The front end of the portion is arranged on the rear side of the vehicle and the front end is set at the height position of the rear end of the upper wall portion. The front end is set at the height position of the rear end of the partition wall portion, and in the third wall portion, the outer portion in the vehicle width direction is arranged on the vehicle rear side of the lower wall portion, and the front end is the lower wall portion. The front structure of the vehicle, which is set at the height position of the rear end. It has a power unit that is arranged inside the vehicle width direction with respect to the front side member and at least a part thereof is located below the vehicle with respect to the front side member.
The dash cross member includes a power unit facing portion facing the power unit in the vehicle front-rear direction at an intermediate portion in the vehicle width direction of the closed cross-section structure portion, and the range including the power unit facing portion in the closed cross-section structure portion is a vehicle side surface. The vehicle front structure according to claim 1, which is configured as a continuum of a plurality of closed cross-sections having a triangular shape in view.

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