JP5652726B2 - Body front structure - Google Patents

Description

  The present invention relates to a structure of a vehicle body front portion of a vehicle.

Conventionally, an engine room is provided in the front part of the vehicle body of the vehicle, and a front upper member (lamp support member) and a front lower member extending in the vehicle width direction are provided on the vehicle front side of the engine room. Members such as (radiator support member) are disposed. The front upper member and the front lower member are provided at the upper and lower positions of the vehicle. The heat exchanger (radiator, condenser) is supported by the front upper member and the front lower member and is disposed at the front of the vehicle body. Yes. Further, the front upper member and the front lower member are connected by a front brace extending in the vehicle vertical direction near the center in the vehicle width direction of the front portion of the vehicle body. On the other hand, some vehicles have a front body structure in which a front bumper member is not provided.
When the pedestrian's leg hits from the front of the vehicle against the vicinity of the center in the vehicle width direction of the front part of the vehicle body having such a structure, a load from the front brace side was applied to the pedestrian's leg.

When a load is applied from the front brace side, the leg part of the pedestrian, particularly the part below the knee, is swung in the vehicle front-rear direction. Thereby, the angle change of the knee becomes large, and there is a concern that the load on the knee increases.
Therefore, in the conventional vehicle body front structure, there is a storage position that covers the vehicle front of the bumper reinforcement and an operation position that is disposed below the storage position and protrudes forward of the vehicle from the bumper reinforcement. Some have a movable bumper (see, for example, Patent Document 1). According to this vehicle front structure, the bumper moved to the operating position hits the pedestrian's leg, so that the input load can be absorbed and bending occurring between the upper part and the lower part of the leg is suppressed. It is supposed to be possible.

JP 2005-132258 A

However, in the conventional structure of the front part of the vehicle body described above, the position of the bumper is set based on the vehicle speed data. When the vehicle speed is low or high, the bumper is positioned at the storage position, and the medium speed In some cases, the bumper is in the operating position. Therefore, when the vehicle speed is low or high, the pedestrian's leg will hit the front of the vehicle in the same manner as before, and there is a risk that bending occurring between the upper part and the lower part of the leg cannot be suppressed. was there.
It has been found that in order to protect the pedestrian's legs, it is important to keep the legs that hit the front brace straight.

  The present invention has been made in view of such a situation, the purpose is to deform the vertical intermediate portion of the front brace when the leg of the pedestrian hits the front brace of the front of the vehicle body, By controlling the position of the front upper member, front brace and front lower member in the longitudinal direction of the vehicle, the legs are kept straight, efficiently absorbing the load on the legs, reducing local loads, An object of the present invention is to provide a structure of a front part of a vehicle body that can more reliably reduce the bending of a part.

In order to solve the above-described problems of the prior art, according to the present invention, a front upper member and a front lower member extending in the vehicle width direction are disposed on the vehicle front side of an engine room, and the front upper member and the front The lower member is a structure of the front part of the vehicle body that is connected by a front brace extending in the vehicle vertical direction.
The upper part of the front brace is connected to the front surface of the front upper member, and the lower part of the front brace is connected to the front surface of the front lower member, and the front lower member is more vehicle than the front upper member. located in front of the front brace, vertically intermediate portion between the front upper member and the front lower member is formed in a curved shape protruding to the front of the vehicle, in front of the front brace A convex bead portion directed toward the front of the vehicle is provided in the vehicle vertical direction, and the bead portion is directed downward from the curved vertical middle portion protruding forward of the vehicle in a direction away from the radiator when viewed from the front of the vehicle. A bent portion formed by connecting the front brace to the front upper member To the vehicle widthwise center of the vehicle width direction center of the connecting portion to the front lower member of said front brace is arranged offset in a direction away from the radiator.

  In the present invention, the front surface of the front upper member connected to the front brace is formed in a shape recessed toward the rear of the vehicle as viewed from above the vehicle.

Furthermore, in the present invention, the lower portion of the curved shape of the front brace below the intermediate portion in the vertical direction is disposed in front of the vehicle with respect to the front surface of the radiator.

Furthermore, in the present invention, the curved middle portion of the front brace projecting forward of the vehicle is set at a knee height position of the leg portion.

As described above, in the structure of the vehicle body front portion according to the present invention, the front upper member and the front lower member extending in the vehicle width direction are disposed on the vehicle front side of the engine room, and the front upper member and the front lower member are arranged. The members are connected by a front brace extending in the vehicle vertical direction, and the upper portion of the front brace is connected to the front surface of the front upper member, and the lower portion of the front brace is: The front lower member is connected to the front surface of the front lower member, and the front lower member is located in front of the vehicle with respect to the front upper member. Of the front braces, the front lower member is located between the front upper member and the front lower member. The middle part of the direction is formed in a curved shape that protrudes forward of the vehicle. When the pedestrian's legs extending in the direction come from the front of the vehicle toward the front brace, the part below the knee contacts the convex middle of the front lower member and the front brace, The upper and lower intermediate portions below the convex curved shape located on the front surface of the brace receive the legs, then the upper and lower intermediate portions are deformed and retracted, and the upper portion of the legs moves to the rear of the vehicle and moves to the front upper member. Will come into contact. At this time, the front upper member, the deformation position of the intermediate portion in the vertical direction, which is the convex curved shape of the front brace, and the front lower member are arranged obliquely. Along with this, the upper part of the leg is positioned rearward of the vehicle with respect to the lower part and is kept obliquely linear.
Therefore, according to the structure of the front part of the vehicle body of the present invention, when the leg part of the pedestrian hits the front brace of the front part of the vehicle body, the middle part in the vertical direction of the front brace is deformed, and the front upper member, the front brace and By controlling the positional relationship of the front lower member, it becomes possible to support the leg part in a straight line, absorb the load by the leg part efficiently, reduce the local load on the leg part, Bending can be reduced.
Moreover, in the structure of the present invention, a convex bead portion that extends toward the front of the vehicle is provided on the front surface of the front brace in the vertical direction of the vehicle, and the bead portion is an intermediate portion in the vertical direction of the curved shape that protrudes forward of the vehicle. The front brace is formed so as to be bent downward in the direction away from the radiator when viewed from the front of the vehicle, with respect to the vehicle width direction center of the connecting portion of the front brace to the front upper member. The vehicle width direction center of the connecting part to the member is offset in the direction away from the radiator, so the load from the pedestrian's legs is applied to the lower bead part of the front brace, and the front brace In addition to deformation to the rear of the vehicle, deformation that twists to the opposite side of the radiator also occurs. Thereby, the absorption performance of the load from a leg part improves, and the local load to a leg part can be relieve | moderated more.

In the structure of the present invention, the front surface of the front upper member connected to the front brace is formed in a shape recessed toward the rear of the vehicle as viewed from above the vehicle. When coming into contact with the front upper member, the upper part is not displaced left and right in the vehicle width direction, and is stably maintained at the connection position with the front brace. Thereby, since the effect which supports a leg part in a straight line improves, the effect of local load relaxation to a leg part and the effect of relaxation of a leg part can be improved further.

Furthermore, in the structure of the present invention, the lower portion of the curved shape of the front brace is positioned in front of the vehicle relative to the front surface of the radiator, so that the legs of the pedestrian are the front bumper and the bumper grille. Even when pushing the bumper net backward and applying a load to the front brace, the front brace can be loaded before the front bumper, bumper grille, or bumper net touches the radiator and distorts asymmetrically. It is possible to promote the deformation of the intermediate portion in the vertical direction of the convex curve shape, and to further exert the effect of supporting the leg portion linearly.

  Also, in the structure of the present invention, the curved upper and lower direction middle portion of the front brace protruding forward of the vehicle is set at the height position of the knee of the leg, so among the legs of the pedestrian, The load from the leg can be received firmly by bringing the hard knee joint into contact with a portion having a large backward deformation. Moreover, as the deformation of the curved shape of the front brace progresses in the middle portion in the vertical direction, it is possible to maintain the effect of supporting the leg portion in a straight line, and a pedestrian protection structure can be obtained with certainty.

It is a perspective view showing appearance of a front part of a vehicle body to which a structure according to an embodiment of the present invention is applied. It is a perspective view which shows the internal structure of the vehicle body front part of FIG. FIG. 3 is a side view showing a front brace and its peripheral parts at the front of the vehicle body in FIG. 2. FIG. 3 is a front view of the front part of the vehicle body of FIG. 2 as viewed from the front of the vehicle. It is a top view which shows the vehicle front part of FIG.

Hereinafter, the present invention will be described in detail based on illustrated embodiments.
1 to 5 show the structure of a vehicle body front portion according to an embodiment of the present invention.

As shown in FIGS. 1 to 5, an engine room E is provided inside a vehicle body front portion 1 of a vehicle to which the structure according to the embodiment of the present invention is applied. A front upper member (lamp support member) 2 and a front lower member (radiator support member) 3 extending in the vehicle width direction are arranged.
In addition, the vehicle body front portion 1 is provided with a pair of left and right side members 4 that extend along the vehicle front-rear direction and are arranged at intervals on the left and right sides in the vehicle width direction. The front upper member 2 is disposed on the upper side in the vicinity of the front end portion of the side member 4, and the left and right headlamps 5 are supported by the front upper member 2 and the like. Further, the front lower member 3 is disposed below the front end portion of the side member 4, and the lower portions of the front end portions of the side members 4 located on the left and right sides are connected by the front lower member 3 and the like. ing. The front upper member 2 and the front lower member 3 are connected to each other by lamp support braces 6 that extend in the vehicle vertical direction and are arranged on the left and right sides of the vehicle front portion 1.

That is, the front upper member 2 and the front lower member 3 of the present embodiment are provided at the vertical position of the vehicle in the vehicle body front portion 1, and the front upper member 2 and the front lower member 3 serve as a heat exchanger such as a radiator 7. Is disposed on the front part 1 of the vehicle body in a state in which is supported. However, a front bumper member is not provided in front of the side member 4 in the vehicle body front portion 1 of the present embodiment.

Further, in the vicinity of the center of the vehicle body front portion 1 according to the present embodiment in the vehicle width direction, as shown in FIGS. 2 to 4, the front upper member 2 and the front lower member 3 extend along the vehicle vertical direction. It is connected by a front brace (hood lock brace) 8. The upper portion 8 a of the front brace 8 of the present embodiment is connected to the front surface of the front upper member 2, and the lower portion 8 b of the front brace 8 is connected to the front surface of the front lower member 3.

Of the front brace 8, the vertical middle portion 8c between the front upper member 2 and the front lower member 3 is formed in a convex curved shape in a vehicle side view protruding toward the front of the vehicle. A portion below the intermediate portion 8 c in the vertical direction formed in this curved shape is disposed in front of the vehicle with respect to the front surface of the radiator 7. The front lower member 3 is located on the vehicle front side with respect to the front upper member 2 in the vehicle front-rear direction. Moreover, the intermediate portion 8c in the vertical direction formed in a curved shape is set at the height position of the knee La of the leg portion L of the pedestrian described later.
For this reason, the positional relationship in the vehicle front-rear direction of the constituent members in the structure of the vehicle body front portion 1 of the present embodiment is such that the front brace 8 has a convexly curved middle portion 8c in the convex curved shape and the front lower member 3 from the front of the vehicle to the rear of the vehicle. The front upper member 2 is arranged in this order, or the front lower member 3, the convexly curved middle portion 8 c of the front brace 8, and the front upper member 2 are arranged in this order. The vertical middle portion 8c and the front lower member 3 may have the same position in the vehicle longitudinal direction.

On the other hand, as shown in FIG. 5, the front surface of the front upper member 2 to which the upper portion 8a of the front brace 8 is connected is formed in a shape recessed toward the rear of the vehicle as viewed from above the vehicle. Thereby, when the upper part of the leg part L of the pedestrian described later contacts the front upper member 2, the recessed part of the front surface of the front upper member 2 receives the upper part of the leg part L, and the upper part of the leg part L Is stably supported at the connecting position with the upper portion 8a of the front brace 8 without being shifted to the left and right in the vehicle width direction.

Further, the vehicle width direction central axis C2 of the connecting portion to the front lower member 3 to which the lower portion 8b of the front brace 8 is connected is the center in the vehicle width direction of the connecting portion to the front upper member 2 to which the upper portion 8a of the front brace 8 is connected. The shaft C1 is offset from the radiator 7 in the direction away from the radiator 7 (the vehicle outer side). In addition, on the front surface of the front brace 8, a convex bead portion 9 directed toward the front of the vehicle is provided in the vehicle vertical direction. The bead portion 9 is formed to bend downward in a direction away from the radiator 7 when viewed from the front of the vehicle (vehicle outer side) from a curved vertical intermediate portion 8c protruding forward of the vehicle.
Thereby, when the upper part of the leg part L of the pedestrian described later contacts the front brace 8, the load from the leg part L is applied to the bead part 9 on the front surface of the front brace 8, and the front brace 8 is While deforming toward the rear, it is configured to cause a deformation that twists to the side opposite to the position where the radiator 7 is disposed.

In addition, in the vehicle body front part 1 of this embodiment, it is comprised so that the pedestrian's leg part L extended corresponding to a vehicle up-down direction may be located in the vehicle front of the front brace 8. FIG. In the structure of this embodiment, the leg part of the human body model for collision analysis made based on the average physique of an adult male is used as the leg part L of the pedestrian. However, the present invention is not limited to this. . Moreover, it is applicable also to other rod-shaped objects other than the pedestrian's leg part L as a collision object.

When the pedestrian's leg portion L hits the front brace 8 of the vehicle body front portion 1 having the structure of the embodiment of the present invention thus configured and having no front bumper member from the front of the vehicle. Of the legs L, the relatively hard knee La comes into contact with the vertically middle portion 8c of the front convex curve of the front brace 8 located in front of the vehicle. As a result, the intermediate portion 8c in the vertical direction of the front brace 8 is deformed in a straight line, and the upper portion 8a of the front brace 8 moves rearward of the vehicle around the lower portion 8b of the front brace 8 connected to the front lower member 3. The front brace 8 is received by the front upper member 2, and the front brace 8 is arranged in an oblique straight line.
As a result, the leg portion L of the pedestrian hitting the front brace 8 is received and supported by the front surfaces of the front brace 8 and the front upper member 2 in an inclined state where the upper portion is located on the rear side of the vehicle, and is supported. (See FIGS. 2 and 3).

Therefore, in the structure of the vehicle body front portion 1 according to the embodiment of the present invention, the leg portion L of the pedestrian (particularly, the knee La at the bending point in the leg and the joint is hard) is the vehicle body. When hitting the front brace 8 of the front part 1, before the bumper net or the like comes into contact with the radiator 7 and is distorted, the convexly curved middle portion 8c protruding forward of the vehicle is deformed, and the front upper member located at the rear of the vehicle The brace upper part 8a, the brace intermediate part 8c, and the brace lower part 8b connected to the front lower member 3 located in front of the vehicle are arranged in an oblique straight line, and the leg portion L of the pedestrian is an oblique straight line. Therefore, the load from the front brace 8 to the pedestrian's leg L can be efficiently absorbed and relaxed, the local load on the leg L can be avoided, and the leg L can be bent. The It can be quite reduced.

Further, according to the structure of the vehicle body front portion 1 according to the embodiment of the present invention, when the upper portion of the leg portion L of the pedestrian comes into contact with the front upper member 2, the upper portion 8a of the front brace 8 is connected. Due to the presence of the concave front surface of the member 2, the upper portion of the leg portion L is not shifted left and right in the vehicle width direction, so that it can be stably received at the connecting position with the upper portion 8a of the front brace 8, and the leg portion L is linear. It is possible to improve the supporting effect.
Furthermore, according to the structure of the vehicle body front portion 1 according to the embodiment of the present invention, the convex bead portion 9 is formed on the front surface of the front brace 8 by bending in the direction away from the radiator 7, and the upper portion 8 a of the front brace 8. The vehicle width direction central axis C2 of the connecting portion to the front lower member 3 of the lower portion 8b of the front brace 8 is offset in the direction away from the radiator 7 with respect to the vehicle width direction central axis C1 of the connecting portion of the front upper member 2 to the front upper member 2. When the load from the leg portion L of the pedestrian is applied to the bead portion 9 of the front brace 8, the front brace 8 is twisted to the side opposite to the radiator 7 while being deformed rearward of the vehicle. The load from the leg L can be absorbed more greatly.

  While the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications and changes can be made based on the technical idea of the present invention.

DESCRIPTION OF SYMBOLS 1 Vehicle body front part 2 Front upper member 3 Front lower member 7 Radiator 8 Front brace 8a Upper part 8b Lower part 8c Vertical direction intermediate part 9 Bead part C1 Center part C2 of the connection part to a front upper member Connection to a front lower member Part of vehicle width direction central axis E Engine room L Pedestrian leg La Knee

Claims (4)

A front upper member and a front lower member extending in the vehicle width direction are disposed on the vehicle front side of the engine room, and the front upper member and the front lower member are connected by a front brace extending in the vehicle vertical direction. In the structure of the front part of the car body,
The upper part of the front brace is connected to the front surface of the front upper member, and the lower part of the front brace is connected to the front surface of the front lower member, and the front lower member is more vehicle than the front upper member. The front brace of the front brace is located at the front, and an intermediate portion in the vertical direction between the front upper member and the front lower member is formed in a curved shape protruding forward of the vehicle ,
A convex bead portion that extends toward the front of the vehicle is provided on the front surface of the front brace in the vertical direction of the vehicle, and the bead portion extends forward from the middle portion of the curved shape that protrudes toward the front of the vehicle. The vehicle width of the connecting portion of the front brace connected to the front lower member with respect to the vehicle width direction center of the connecting portion of the front brace to the front upper member is formed by bending in a direction away from the radiator as viewed The structure of the front part of the vehicle body, characterized in that the direction center is offset in a direction away from the radiator .   The structure of the front portion of the vehicle body according to claim 1, wherein a front surface of the front upper member to which the front brace is connected is formed in a shape recessed toward the rear of the vehicle as viewed from above the vehicle.   The structure of the front portion of the vehicle body according to claim 1 or 2, wherein a portion of the front brace that is lower than a middle portion in the vertical direction is disposed in front of the vehicle with respect to the front surface of the radiator. The front side of the vehicle body according to any one of claims 1 to 3, wherein the curved middle portion of the front brace projecting forward of the vehicle is set at a knee height position of a leg portion. Part structure.

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