Brevet FR3090533A1 — publié le 20200626

Description Titre de l'invention : VEHICLE FRONT PORTION STRUCTURE Domaine technique [0001] The present invention relates to a vehicle front portion structure that is capable of more reliably absorhing an impact load at the central section of a vehicle. Technique antérieure [0002] A bumper beam structure is conventionally known in which an impact absorbing member is coupled to the front of a bumper beam body (bumper member) made of steel in order to absorb an impact applied to a vehicle body upon application of an impact load from the front of the vchicic body (Sec Patent Litcraturc 1). Problème technique [0003] However, in a vehicle front portion structure, rigid bodies such as a radiator and a hood latch are arranged at the center of the vehicle front portion. Thus, there is still room for improvement in structure so that it is capable of more reliably absorbing an impact, particularly at the central section of the vehicle. 100041 An ohject of the present invention is to provide a vehicle front portion structure that is capable of more reliably absorbing an impact load applied from the front side of a vehicle, particularly, an impact load at the central section of the vehicle. Solution technique 100051 In order to solve the problems descrihed ahove, the present invention is a vehicle front portion structure including: a bumper member arranged in a vehicle width direction on a back side of a bumper body; and a pair of radiator support members that are arranged on opposite sides of a radiator positioned at rear of the bumper member, and that support the humper member, in which: an impact absorhing member is arranged in front of the bumper member in the vehicle width direction; the impact absorbing member has an upper surface portion and a hottom surface portion that are joined respectively to an upper surface and a bottom surface of the bumper member, and includes a front surface portion extending toward a back side of the humper body; the front surface portion and the upper surface portion of the impact absorbing member are formed to be connected hy an inclined surface extending obliquely downward to front, and the front surface portion and the hottom surface portion of the impact absorbing member are formed to be connected by an inclined surface extending obliquely upward to front; a gap portion is provided Between the impact absorhing member and the bumper member; and the front surface portion of the impact ahsorbing member protrudes more forward toward a vehicle-width-direction center in plan view, and the inclined surface is formed to hecome wider in a vertical direction toward the 2 vehicle-width-direction center. Avantages apportés 100061 According to the present invention, the front surface portion of the impact absorbing member protrudes more forward toward the vehicle-width-direction center in plan view, and the inclined surface is formed to become wider in a vertical direction toward the N'aide-width-direction center. Therefore, a structure that is capable of more rcliably absorbing an impact particularly at the central section of the vchicic upon application of an impact from the forward sidc of the vchicic can be obtained. Brève description des dessins Fig. 1 [0007] [fig.1] Figure 1 is an exploded perspective view of a vehicle fi-ont portion structure according to an embodiment of the present invention with a front bumper body removed. Fig. 2 [0008] [fig.2] Figure 2 is a front view of the vehicle tiont portion structure illustrated in Figure 1 with the fi-ont bumper body removed. Fig. 3 [0009] [fig.3] Figure 3 is a perspective view of the vehicle front portion structure illustrated in Figure 1 with a radiator removed. Fig. 4 [0010] [fig.4] Figure 4 is a cross-sectional vicw taken along line A-A of Figure 1. Fig. 5 [0011] [fig.5] Figure 5 is a cross-sectional vicw taken along line B-B of Figure 1. Fig. 6 [0012] [fig.6] Figure 6 is a conceptual cross-sectional vicw for describing impact absorbing effects upon a collision. Description des modes de réalisation [0013] Hereinafter, an embodiment of the present invention is described in detail with reference to the drawings. [0014] Figure 1 is an exploded perspective view of a vehicle front portion structure according to the embodiment of the present invention with a front bumper body removed. Figure 2 is a front view of the vehicle front portion with the front bumper body removed. Figure 3 is a perspective view of the vehicle front portion structure illustrated in Figure 1 with a radiator removed. Figure 4 is a diagram for illustrating a cross section taken along line A-A of Figure I. Figure 5 is a diagram for illustrating a cross section taken along line B-B of Figure I. 10015] In Figure I to Figure 5, reference sign I denotes a front bumper body located on the 3 front surface of a vehicle. At the central portion of the front bumper body 1, a gridpattern radiator grille portion 1 A is providcd, through which cooling air is drawn to cool a radiator (to be described later) arranged on the rcar side of the front bumper body 1. The radiator grille portion l A is dividcd into an upper side and a lower side with respect to the central portion of the front bumper body 1. An upper grille portion 1A1 is providcd on the upper side, and a lower grille portion 1 A2 is providcd on the lower [0016] On the rcar side of the front bumper body 1, a vehicle body front portion 2 that forms an engine compartment is providcd. The vehicle body front portion 2 is constituted hy right and loft side mcmbers 3 and 3 that arc respectively located in a longitudinal direction of the vehicle, radiator support members 4 and 4 that arc located in a vertical direction on the right and the loft of the front end portion of the vehicle, and that are respectively supported hy the tip end portions of the side members 3 and 3 at the intermediate position on the rcar surface portion of the radiator support members 4 and 4, an upper member 5 that is located in a vehicle width direction, and that connects the upper end portions of the radiator support mcmbers 4 and 4 to cach other, a lower member 6 that is located in the vehicle width direction on the lower surface side, and that connects the lowcr end portions of the radiator support mcmbers 4 and 4 to cach other, and a bumper member 7 that is arranged in the vehicle width direction on the pack side of the but-riper body 1, and that is supported at the opposite end portions of the bumper member 7 respectively by the radiator support members 4 and 4 at the intermediate position of their front end portions. At the rear of the bumper member 7, a radiator 8 that cools the engine in the engine compartment is located and is supported by the upper member 5 and the lower member 6. The radiator 8 is cooled by a cooling fan (not illustrated) and cooling air introduced through the grille portion 1A. [0017] The bumper member 7 is formed with a closed cross-sectional shape SI by joining two members that are a plate-like front member 71 and a plate-like rear member 72 that are elongated in the vehicle width direction. Upper (lange portions 71a and 72a of the front member 71 and the rear member 72 are fmmed by both being bent toward the rear of the vehicle and joined to each other by spot welding or the like. Lower flange portions 71b and 72b extend downward by being bent downward, and are joined to each other by spot welding or the like. [0018] An impact absorbing member 9 that is elongated in the vehicle width direction is joined to the tiont surface of the bumper member 7 by spot welding. The impact absorbing member 9 is fmmed into a generally trapezoidal shape in cross section which is convex toward the front, and has an opening on the rear side. An upper flange portion 9a on the upper surface side of the impact absorbing member 9 is joined to the upper flange portions 71a and 72a of the front member 71 and the rear member 72 with these three plates spot-welded together. A lower flangc portion 9h is joined to the lower flangc portions 71 h and 72h of the front member 71 and the rcar member 72 with thesc three plates spot-welded together. The impact absorbing member 9 is formed with a closed cross-seetional shapc S2 between this impact absorbing member 9 and the bumper member 7. [0019] As illustrated in Figure 1, Figure 2, and Figure 5, the impact absorbing member 9 is provided with an upper inclincd surface 9d extending obliquely downward toward the front between the upper end of a front surface portion 9c and the upper flangc portion 9a, and is also providcd with a lower inclincd surface 9c extending obi iqucly downward toward the rcar between the lower end of the front surface portion 9c and the lower flangc portion 9h. The upper inclincd surface 9d and the lower inclincd surface 9c arc formed with a grcater length Ll of the upper inclincd surface 9d and the lower inclincd surface 9c to a vehicle-width-direction central portion 9f of the front surface portion 9c such that the vehicle-width-direction central portion 9f protrudes most forward. The upper inclincd surface 9d and the lower inclincd surface 9c arc formed with the grcater length Ll to the vehicle-width-direction central portion 9f. Thus, the front surface portion 9c is formcd in a rclationship of: H1 (a vertical width ncar the vehicle-width-direction central portion)