JP6623676B2 - Vehicle front structure - Google Patents

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle front structure including a bumper member disposed at a vehicle front and extending in a vehicle width direction.

  BACKGROUND ART A vehicle front structure such as an automobile includes, for example, left and right side members extending in a vehicle front-rear direction, a front cross member, and a crash box as a shock absorbing member (for example, Patent Document 1).

  The front cross member is a member arranged at the front of the vehicle and extending in the vehicle width direction, and connects the front ends of the left and right side members. The crash boxes are arranged in front of both ends of the front cross member. In Patent Literature 1, it is described that the crash box absorbs the impact by being crushed and deformed sequentially from the front to the rear in response to the impact from the front of the vehicle.

JP 2009-73309 A

  However, in the case of a front body structure using a crash box, in the event of an offset collision where the impact force is concentrated on either the left or right side of the front of the vehicle, the structure of the crash box becomes complicated and the weight and weight are reduced in order to ensure sufficient shock absorption performance There is a problem that the manufacturing cost increases.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a vehicle front structure capable of efficiently absorbing shock at the time of an offset collision with a simple configuration.

  In order to solve the above-mentioned problem, a typical configuration of a vehicle front structure according to the present invention is a vehicle front structure including a bumper member arranged in a vehicle front portion and extending in a vehicle width direction, and a rear side of both ends of the bumper member. A pair of side members respectively arranged in the vehicle front-rear direction, and a pair of absorbers respectively arranged in front of both ends of the bumper member, wherein the absorber is located outside of the side member in the vehicle width direction when viewed from the vehicle front side. It is characterized by being arranged at a position straddling the outer side surface.

  In the above configuration, at the time of an offset collision in which the impact force is concentrated on one of the left and right sides of the front of the vehicle, a load is applied so that the bumper member bends and the pair of side members is drawn inward. Therefore, by arranging the absorber at a position straddling the outside surface of the side member in the vehicle width direction, the load can be transmitted to the outside surface of the side member via the absorber. That is, according to the above configuration, in addition to the load that pulls the side member inward as the bumper member bends, a load that acts to bend the side member outward through the absorber can be transmitted. Therefore, according to the above configuration, with the simple configuration in which the absorber is disposed at a predetermined position, the side member is unlikely to bend inward or outward during an offset collision, buckling toward the rear side of the vehicle, and efficiently absorbing shock. Becomes possible.

  The center of the absorber in the vehicle width direction may be located outside the outer surface of the side member in the vehicle width direction. Thereby, most of the load received by the absorber at the time of the offset collision is transmitted to the outer surface of the side member from the vehicle outer side in the vehicle width direction than the outer surface of the side member. Therefore, the load acting to bend the side member outward can be transmitted more reliably to the side member.

  The above-described absorber has a plate-shaped front portion that protrudes most toward the front of the vehicle, and two plate-shaped legs that extend rearward from the upper and lower edges of the front portion and connect the front portion and the bumper member. The edges of the two legs on the inside of the vehicle may be inclined so as to be located on the inside of the vehicle toward the rear of the vehicle. Thus, when a load is applied to the front portion of the absorber at the time of the offset collision, the inner edges of the two leg portions of the absorber are hardened, and the absorber is unlikely to fall into the interior of the vehicle. Therefore, the load can be reliably transmitted to the outer surface of the side member.

  The front portion of the absorber may have a vertically long shape in which the length in the vehicle width direction is shorter than the length in the vehicle vertical direction. Here, it is assumed that the space between the absorber and another member existing outside the absorber is narrow. Even in such a case, if the front portion of the absorber is vertically long, the absorber is arranged at a position straddling the outer surface of the side member in the vehicle width direction as viewed from the front side of the vehicle while securing the area of the front portion. it can. Further, since the area of the front part of the absorber can be secured, a local load is not applied to the pedestrian leg at the time of collision, and the pedestrian leg protection performance can be secured.

  It is preferable that the outer surface of the side member has a fragile portion having lower rigidity than the periphery. Accordingly, when a load is transmitted to the outer surface of the side member via the absorber at the time of the offset collision, the outer surface of the side member is more easily bent than the surroundings. Therefore, the side members buckle reliably toward the rear side of the vehicle, enabling efficient shock absorption.

  According to the present invention, it is possible to provide a vehicle front structure capable of efficiently absorbing an impact at the time of an offset collision with a simple configuration.

It is a figure showing the body frame of the vehicle front structure in this embodiment. FIG. 2 is a view on arrow A of the vehicle front structure of FIG. 1. FIG. 2 is a view on arrow B of the vehicle front structure of FIG. 1. FIG. 2 is a view as viewed in the direction of the arrow C of the vehicle front structure in FIG. 1. FIG. 3 is a view illustrating a behavior of the vehicle front structure in FIG. 2 at the time of an offset collision. FIG. 4 is a diagram illustrating a behavior when the impactor having the vehicle front structure illustrated in FIG. 3 collides.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, other specific numerical values, and the like shown in the embodiments are merely examples for facilitating the understanding of the invention, and do not limit the present invention unless otherwise specified. In the specification and the drawings, elements having substantially the same function and configuration will be denoted by the same reference numerals, and redundant description will be omitted. Elements not directly related to the present invention will be omitted. I do.

  FIG. 1 is a diagram illustrating a vehicle body skeleton of a vehicle front structure according to the present embodiment. Hereinafter, arrows X and Y shown in the drawings indicate the front of the vehicle and the outside in the vehicle width direction, respectively. As shown in FIG. 1, the vehicle body skeleton of the vehicle front structure 100 is formed by joining a plurality of vehicle body structural members. Note that the skeleton of the vehicle front structure 100 described in detail below is merely an example for facilitating understanding, and is not limited to this.

  In the vehicle front structure 100, the upper frame in the vehicle width direction is constituted by a hood lock member 102, and below the hood lock member 102, a bumper member 104 located at the vehicle front and extending in the vehicle width direction is disposed. I have.

  A pair of apron side members 110, 112 extending in the vehicle front-rear direction are arranged behind both ends 106, 108 of the bumper member 104. Both ends 114, 116 of the hood lock member 102 in the vehicle width direction and a pair of apron side members 110, 112 are joined by a pair of lamp support braces 118, 120 extending in the vehicle vertical direction.

  Below the bumper member 104, a lower cross member 122 extending in the vehicle width direction is disposed as a lower frame in the vehicle width direction. Both ends 124, 126 of the lower cross member 122 in the vehicle width direction and both ends 106, 108 of the bumper member 104 in the vehicle width direction are joined by a pair of radiator support braces 128, 130 extending in the vehicle vertical direction. In addition, a lower absorber 132 extending in the vehicle width direction is disposed on the front surface of the lower cross member 122.

  The vehicle front structure 100 further includes a pair of bumper member absorbers 134 and 136. The pair of bumper member absorbers 134 and 136 are disposed on the front sides of both ends 106 and 108 of the bumper member 104, respectively. These members form the skeleton of the vehicle front structure 100.

  Here, in the vehicle front structure 100, at the time of an offset collision in which the impact force is concentrated on one of the left and right sides of the front of the vehicle, a load is applied so that the bumper member 104 bends and the pair of apron side members 110 and 112 are drawn inward. Therefore, in the present embodiment, a configuration is adopted in which the pair of bumper member absorbers 134 and 136 are arranged at positions that straddle the outer side surfaces 138 and 140 of the pair of apron side members 110 and 112 in the vehicle width direction when viewed from the vehicle front side. Then, the load can be transmitted to the outer side surfaces 138 and 140 of the pair of apron side members 110 and 112 (see FIG. 2).

  FIG. 2 is a view on arrow A of the vehicle front structure 100 of FIG. FIG. 3 is a view on arrow B of the vehicle front structure 100 of FIG. FIG. 4 is a view on arrow C of the vehicle front structure 100 of FIG. Hereinafter, of the pair of bumper member absorbers 134 and 136, the bumper member absorber 134 disposed on the right side of the vehicle will be described. However, the bumper member absorber 136 disposed on the left side of the vehicle has the same configuration. Each drawing mainly shows a region D surrounded by a dotted line in FIG. However, in FIG. 2, the lower cross member 122 and the lower absorber 132 are omitted.

  As shown in FIG. 2, the bumper member absorber 134 is disposed at a position straddling the outer side surface 138 of the apron side member 110 on the outer side in the vehicle width direction indicated by a dotted line E in the drawing. Further, the center 142 of the bumper member absorber 134 in the vehicle width direction is located outside the outer side surface 138 of the apron side member 110 in the vehicle width direction.

  The bumper member absorber 134 is a plate-shaped member, and has a plate-shaped front portion 144 that protrudes the most toward the front of the vehicle, and two plate-shaped legs 146 and 148, as shown in FIG. The two legs 146 and 148 extend from the upper and lower edges of the front part 144 to the rear side of the vehicle, respectively, and connect the front part 144 and the bumper member 104. As an example, the bumper member absorber 134 of this embodiment has a plate thickness of 1.8 mm, a length La of the front portion 144 in the vehicle vertical direction of 40 mm, and a length Lb of the two legs 146 and 148 in the vehicle front-rear direction. Was set to about 36 mm.

  Further, as shown in FIG. 3, the outer side surface 138 of the apron side member 110 has a fragile portion 150 having lower rigidity than the periphery. Fragile portion 150 includes a plurality of holes 152 and a plurality of beads 154 extending in the vehicle up-down direction so as to be orthogonal to the direction in which the load received from the front of the vehicle is transmitted.

  As shown in FIG. 4, the front portion 144 of the bumper member absorber 134 has a vertically long shape in which the length in the vehicle width direction is shorter than the length in the vehicle vertical direction. As shown in FIG. 2, the inner edges 156, 158 of the two legs 146, 148 are inclined so as to be located closer to the rear of the vehicle. As an example, the inner edges 156, 158 of the two leg portions 146, 148 are inclined outward by 15 degrees or more with respect to the vehicle longitudinal direction.

  FIG. 5 is a diagram showing the behavior of the vehicle front structure 100 of FIG. 2 at the time of an offset collision. First, a description will be given of a case where “10 msec” shown in FIG. 5B has elapsed from the moment “0 msec” (msec means millisecond) at the time of the offset collision shown in FIG. . In this case, in the vehicle front structure 100, in addition to the load F that pulls the apron side member 110 inward as the bumper member 104 bends, the load G is transmitted to the outside of the apron side member 110 via the bumper member absorber 134. .

  As a result, the outer side surface 138 of the apron side member 110 is deformed like a region H as shown in FIG. Further, when “20 msec” elapses from the time of the offset collision, the apron side member 110 buckles toward the rear side of the vehicle as shown in a region I of FIG.

  Therefore, according to the vehicle front structure 100, the apron side member 110 is unlikely to bend inward or outward during an offset collision with a simple configuration in which the bumper member absorber 134 is disposed at a position straddling the outer side surface 138 of the apron side member 110. Buckling toward the rear side of the vehicle, enabling efficient shock absorption.

  The center 142 of the bumper member absorber 134 in the vehicle width direction is located outside the outer surface 138 of the apron side member 110 in the vehicle width direction. For this reason, most of the load received by the bumper member absorber 134 at the time of the offset collision is transmitted to the outer surface 138 of the apron side member 110 from the vehicle width direction outside the outer surface 138 of the apron side member 110. Therefore, according to the vehicle front structure 100, the load acting to bend the apron side member 110 outward can be transmitted to the apron side member 110 reliably.

  The inner edges 156, 158 of the two legs 146, 148 of the bumper member absorber 134 are inclined so as to be located closer to the rear of the vehicle. For this reason, when the front part 144 of the bumper member absorber 134 receives a load at the time of an offset collision, the bumper member absorber 134 becomes hard to fall on the inner edges 156 and 158 of the two legs 146 and 148 and fall down inside the vehicle. The load can be reliably transmitted to the outer side surface 138 of the apron side member 110.

  Further, the outer surface 138 of the side member has a weak portion 150. Therefore, when a load is transmitted to the outer surface 138 of the apron side member 110 via the bumper member absorber 134 at the time of an offset collision, the outer surface 138 of the apron side member 110 is more easily bent than its surroundings. Therefore, the apron side member 110 reliably buckles toward the rear side of the vehicle, enabling efficient shock absorption.

  Further, the front portion 144 of the bumper member absorber 134 has a vertically long shape in which the length in the vehicle width direction is shorter than the length in the vehicle vertical direction. Here, in the vehicle front structure 100, it is assumed that the space between the bumper member absorber 134 and another member such as a fender panel (not shown) existing outside the vehicle of the bumper member absorber 134 is narrow. Even in such a case, if the front portion 144 of the bumper member absorber 134 is vertically long, the outer surface 138 of the apron side member 110 when viewed from the front side of the vehicle is secured while securing the area of the front portion 144. The bumper member absorber 134 can be arranged at a position straddling the direction.

  Since the area of the front portion 144 of the bumper member absorber 134 can be secured, local load is not applied to the pedestrian leg at the time of the offset collision, and the pedestrian leg protection performance can be secured. Hereinafter, the pedestrian leg protection performance test for the vehicle front structure 100 will be described.

  FIG. 6 is a diagram illustrating a behavior when the impactor 160 of the vehicle front structure 100 in FIG. 3 is caused to collide. Here, the impactor 160 simulates a pedestrian leg, and includes an upper limb 162, a knee 164, and a lower limb 166, and a sensor (not shown) is attached to each part.

  In the pedestrian leg protection performance test, the impactor 160 collides with the vehicle front structure 100 from the front of the vehicle, and based on the measurement value of the sensor of the impactor 160, the injury value of the tibia due to the tibia bending moment, the rear of the knee, The damage value of knee shear is verified by the amount of extension of the cruciate ligament (PCL) and the anterior cruciate ligament (ACL). In the present embodiment, the dimensional difference Lc in the vehicle front-rear direction between the front portion 144 of the bumper member absorber 134 of the vehicle front structure 100 and the front end 168 of the lower absorber 132 is set to 40 mm or less.

  First, a case where “20 msec” shown in FIG. 6B has elapsed from the moment “0 msec” at the start of the pedestrian leg protection performance test shown in FIG. 6A in the vehicle front structure 100 will be described. In this case, the lower leg 166 of the impactor 160 moves toward the front end 168 of the lower absorber 132 and collides with the front end 168 of the lower absorber 132 as indicated by an arrow J in FIG. However, since the dimensional difference Lc is equal to or less than 40 mm, the repulsive force of the lower absorber 132 to jump up the lower limb 166 is small (see the arrow K in FIG. 6B).

  On the other hand, the upper limb portion 162 of the impactor 160 has a small repulsive force even when the lower limb portion 166 collides with the front end 168 of the lower absorber 132, so that the upper limb portion 162 faces the vehicle rearward and downward as shown by the arrow L in FIG. And move quickly. If the upper limb 162 moves quickly along the arrow L before the lower absorber 132 jumps up the lower limb 166, the posterior cruciate ligament (PCL) and the anterior cruciate ligament (ACL) of the knee extend. Therefore, the injury value of the shearing of the knee is deteriorated.

  Therefore, in the present embodiment, by setting the thickness of the bumper member absorber 134 to 1.8 mm as described above, the lower leg 166 of the impactor 160 moves toward the bumper member absorber 134 (arrow in FIG. 6B). M), so as not to be crushed by collision. As a result, as shown in FIG. 6C, when “40 msec” has elapsed from the start of the pedestrian leg protection performance test, the impactor 160 causes the lower leg 166 to jump up by the bumper member absorber 134 in addition to the lower absorber 132. As a result (see arrows K and N in the figure), the posture of the lower limb 166 with respect to the upper limb 162 moving quickly along the arrow L could be maintained. Thereby, according to the present embodiment, it was possible to suppress the deterioration of the injury value due to the shearing of the knee.

  Further, even in a situation where the bumper member absorber 134 cannot be crushed, the lower part 166 of the impactor 160 can be received in a wide range by forming the front portion 144 in a vertically long shape having a length La of 40 mm or more in the vehicle up-down direction. Injury value can be suppressed. If the length Lb of the two legs 146 and 148 in the vehicle front-rear direction is approximately 90% (about 36 mm) of the length La of the front portion 144 in the vehicle vertical direction, the length Lb may be slightly affected by the load from the impactor 160. It is possible to deform and absorb the collision energy.

  As described above, according to the present embodiment, at the time of an offset collision, the pair of apron side members 110 and 112 can be securely buckled toward the rear side of the vehicle to enable efficient shock absorption, Leg protection performance can also be secured.

  As described above, the preferred embodiments of the present invention have been described with reference to the accompanying drawings, but it is needless to say that the present invention is not limited to such examples. It is obvious that those skilled in the art can conceive various changes or modifications within the scope of the claims, and these naturally belong to the technical scope of the present invention. I understand.

  INDUSTRIAL APPLICATION This invention can be utilized for the vehicle front structure provided with the bumper member arrange | positioned at the vehicle front and extending in the vehicle width direction.

100: Vehicle front structure, 102: Food lock member, 104: Bumper member, 106, 108: Both ends of bumper member, 110, 112: Apron side member, 114, 116: Both ends of food lock member, 118, 120: Lamp support Members, 122: lower cross member, 124, 126: both ends of the lower cross member, 128, 130: radiator support brace, 132: lower absorber, 134, 136: bumper member absorber, 138, 140: outer surface of the apron side member, 142 center of bumper member absorber, 144 front part, 146, 148 leg part, 150 weak part, 152 hole part, 154 bead, 156, 158 inside edge of the leg part, 160 ... impactor, 162: upper limb, 164: knee, 166: lower limb 168 ... the front end of the lower absorber

Claims (3)

In a vehicle front structure including a bumper member disposed in a vehicle front portion and extending in a vehicle width direction,
A pair of side members arranged at the rear side of both ends of the bumper member and extending in the vehicle front-rear direction,
A pair of absorbers respectively arranged on the front side of both ends of the bumper member,
The absorber is disposed at a position straddling the outer side surface of the side member in the vehicle width direction, as viewed from the vehicle front side, and protrudes most forward of the vehicle, and the length in the vehicle width direction is greater than the length in the vehicle vertical direction. also has a front plate of that having a short longitudinal shape, and two leg portions of the respective upper and lower edges extending in the vehicle rear side connecting the said the said front bumper member plate-like front portion,
A vehicle front structure, wherein edges of the two legs on the vehicle interior side are inclined so as to be located on the vehicle interior side toward the rear side of the vehicle.   The vehicle front structure according to claim 1, wherein a center of the absorber in the vehicle width direction is located outside of an outer surface of the side member in a vehicle width direction. The outer surface of the side member of the vehicle front structure according to claim 1 or 2, characterized in that it has a low brittle portion rigidity than surrounding.

Images