JP2018008626A - Vehicle front structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent impact absorption performance due to a hood from being deteriorated by a damper stay.SOLUTION: A bonnet hood 20 includes an outer panel 21 composing the outer surface of a vehicle, and an inner panel 23 mounted inside the outer panel 21. A damper stay 50 includes: a rear end part 51 supported on a vehicle side; a front end part 52 located on the front side from the rear end part 51 when the bonnet hood 20 is at a closed position, and supported on the side of the inner panel 23. A bead part 28 functioning as a starting point of deformation and extending forward the inner panel 23 is formed on the rear side of a front-side bracket 40 supporting the front end part 52 in the inner panel 23 and adjacent to the front-side bracket.SELECTED DRAWING: Figure 2

Description

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

  An engine room for mounting an engine is provided at a front portion of a vehicle such as a so-called FR car or FF car, and a hood for opening and closing an upper opening of the engine room is provided (see, for example, Patent Document 1). ).

  As shown in FIG. 5, the conventional bonnet hood 120 has an outer panel 121 and an inner panel 123. A pair of left and right hinges that swingably support the hood hood 120 are provided between the rear end of the hood hood 120 and the vehicle body. A damper stay 150 that urges the hood 120 from the closed position toward the open position is attached between the hood 120 and the vehicle body. As the damper stay 150, a gas spring is mainly used. The damper stage 150 has a rear end portion 151 supported on the vehicle body side, and a front end portion 152 that is positioned in front of the rear end portion 151 and supported on the inner panel 123 side when the hood hood 120 is in the closed position. doing.

Japanese Patent Laying-Open No. 2005-22502

  By the way, as shown by an arrow A in FIGS. 5 and 6, for example, when a pedestrian's head H collides with the upper surface of the hood 120, it is attached to the inner panel 123 as shown by an arrow B in FIG. Thus, a force to rotate counterclockwise about the front end portion 152 acts on the bracket 140 that supports the front end portion 152 in a swingable manner. At this time, the hood hood 120 is in the closed position, and the damper stay 150 cannot be further contracted. Therefore, the deformation of the outer panel 121 and the inner panel 123 is hindered by the damper stay 150, and the impact absorption performance by the bonnet hood 120 may be impaired.

  Such a problem is not limited to the structure provided with the hood hood that opens and closes the upper opening of the engine room, but commonly occurs in the structure including the hood that opens and closes the upper opening of the accommodating portion provided in the front portion of the vehicle. .

  The objective of this invention is providing the front part structure of the vehicle which can suppress that the impact-absorbing performance by a hood is impaired by a damper stage.

  A vehicle front structure for achieving the above object is provided between a hood that opens and closes an upper opening of a housing portion provided at a vehicle front portion, a rear end portion of the hood, and a vehicle body. A hinge that is swingably supported, a hood support that is provided on the vehicle body and supports a front end portion of the hood at a closed position of the hood, and is swingably supported by the hood and the vehicle body, and the hood And a damper stay that biases from the closed position toward the open position. The hood includes an outer panel that constitutes an outer surface of the vehicle, and an inner panel provided on the inner side of the outer panel. The damper stay is supported at a vehicle body side, and the hood is closed. A front end portion that is positioned on the front side of the rear end portion and is supported on the inner panel side at the time of the position, and on the rear side of the front support portion that supports the front end portion of the inner panel A stress concentration portion serving as a starting point of deformation extending forward of the inner panel is formed adjacent to the front support portion.

  According to this configuration, when a pedestrian collides with the upper surface of the hood toward the front support portion that supports the front end portion of the damper stay, the impact force is input to the inner panel via the outer panel. At this time, since the front end portion and the rear end portion of the hood are supported by the hood support portion and the hinge, respectively, stress concentrates on the stress concentration portion of the inner panel, and the inner panel extends forward from the stress concentration portion. . That is, the front part of the inner panel relative to the stress concentration part is displaced forward. Accordingly, the damper stay is allowed to extend forward, and the deformation of the hood can be prevented from being inhibited by the damper stay. Therefore, it is possible to suppress the impact absorption performance by the hood from being damaged by the damper stay.

  In the vehicle front structure, the inner panel includes an attachment wall portion to which the front support portion is attached, a vertical wall portion extending upward from a rear end of the attachment wall portion, and the vertical wall portion. And a rear wall portion whose upper and lower intervals with the outer panel are made smaller than those of the mounting wall portion, and the stress concentration portion is formed between the vertical wall portion and the rear wall portion. It is preferable to form between them.

  According to this configuration, when the inner panel extends forward from the stress concentration portion, the vertical wall portion is pushed forward of the vehicle. For this reason, the front support part is greatly pushed forward by the height of the vertical wall part. Thereby, a damper stay can be extended greatly and a deformation | transformation of a hood can be accelerated | stimulated. Therefore, the impact absorption performance by the hood can be enhanced.

  In the vehicle front structure, the stress concentration portion includes a bead portion that extends along the vehicle width direction and protrudes toward the outer panel side, or a through hole that extends along the vehicle width direction. It is preferable.

  According to this configuration, the stress concentration portion can be easily formed by forming the bead portion or the through hole extending along the vehicle width direction on the inner panel.

  ADVANTAGE OF THE INVENTION According to this invention, it can suppress that the shock absorption performance by a hood is impaired by a damper stage.

The top view which shows the front part of the vehicle with which the front part structure was applied about one Embodiment of the front part structure of a vehicle. FIG. 2 is a cross-sectional view taken along line 2-2 of FIG. It is sectional drawing for demonstrating the effect | action of the embodiment, Comprising: Sectional drawing which shows the deformation | transformation aspect of a bonnet hood when a pedestrian's head collides with a bonnet hood. Sectional drawing which shows the modification of the front part structure of a vehicle. Sectional drawing which shows the front part structure of the vehicle centering on the conventional bonnet hood. Sectional drawing which shows the deformation | transformation aspect of a bonnet hood when a pedestrian's head collides with the conventional bonnet hood.

Hereinafter, an embodiment will be described with reference to FIGS.
As shown in FIG. 1, an engine room 10 is provided at the front of the vehicle. Further, the vehicle is provided with a hood hood 20 that opens and closes the upper opening 11 of the engine room 10. The left-right direction when viewing the front from the rear of the vehicle is referred to as “left-right direction”. Further, the front structure of the vehicle is symmetrical. Therefore, the configuration provided on the right side is provided on the left side in the same manner as the right side. In the following, the description of the left side structure is omitted, and the description of the left side structure is omitted.

  As shown in FIG. 2, a hinge 13 is attached to the upper surface of the cowl side panel 12 constituting the inner surface of the engine room 10 so as to swingably support the rear end portion of the hood hood 20.

  As shown by a two-dot chain line in the figure, the vehicle is provided with a radiator core support 14 that supports a radiator core (not shown). An elastic member 15 is provided on the upper surface of the radiator core support 14. The elastic member 15 is made of, for example, a rubber material. The radiator core support 14 and the elastic member 15 constitute a hood support portion 16 that supports the front end portion of the hood hood 20 at the closed position of the hood hood 20.

  A strut tower 17 is formed integrally with the cowl side panel 12. A damper stay 50 is provided between the strut tower 17 and the bonnet hood 20 to urge the bonnet hood 20 from the closed position toward the open position.

Next, the structure of the bonnet hood 20, particularly the structure of the outer part in the vehicle width direction will be described.
As shown in FIG. 2, the hood hood 20 includes an outer panel 21 that constitutes the outer surface of the vehicle, and an inner panel 23 that is provided inside the outer panel 21. The outer panel 21 and the inner panel 23 are made of a metal material such as an aluminum alloy, for example. The outer panel 21 and the inner panel 23 have their outer edge portions 22 and 24 joined to each other by hemming.

The outer panel 21 has a cross-sectional shape curved so as to be positioned on the upper side toward the rear side.
The inner panel 23 includes a front wall portion 25, a mounting wall portion 26, a vertical wall portion 27, a bead portion 28, and a rear wall portion 29 in order from the front side. The front wall portion 25 extends downward while being bent. The mounting wall portion 26 extends along the front-rear direction of the vehicle. The vertical wall portion 27 is bent from the rear end of the mounting wall portion 26 and extends upward. The bead portion 28 extends along the vehicle width direction over a predetermined width and protrudes toward the outer panel 21 side. The rear wall portion 29 has a lower vertical distance from the outer panel 21 than the mounting wall portion 26. The vertical wall portion 27 and the rear wall portion 29 are inclined in the front-rear direction of the vehicle so as to be positioned on the upper side toward the rear side. However, the inclination angle of the vertical wall portion 27 with respect to the longitudinal direction of the vehicle is larger than the maximum inclination angle of the rear wall portion 29.

Next, the configuration of the damper stay 50 will be described. In FIG. 2, a cross-sectional structure of the damper stay 50 is schematically shown.
As shown in FIG. 2, the damper stay 50 is a known gas spring having a bottomed cylindrical cylinder 53 and a piston rod 54 that is partially inserted into the cylinder 53 and can be displaced in the axial direction. The reaction force of the gas sealed in 53 is used as a spring force.

  In the present embodiment, the rear mounting portion 55 is connected to the bottom of the cylinder 53. The front end portion of the rear attachment portion 55, that is, the rear end portion 51 of the damper stay 50 is supported by the rear bracket 30 fixed to the strut tower 17 so as to be swingable.

  A front mounting portion 56 is connected to the tip of the piston rod 54. The front mounting portion 56, that is, the front end portion 52 of the damper stay 50 is swingably supported by the front bracket 40 fixed to the rear end portion of the mounting wall portion 26 of the inner panel 23.

Therefore, the front end portion 52 of the damper stay 50 is located on the front side of the rear end portion 51 when the bonnet hood 20 is in the closed position.
Next, the operation of this embodiment will be described.

  As indicated by an arrow A in FIG. 3, when the pedestrian's head H collides with the upper surface of the hood 20 toward the front bracket 40, the impact force is input to the inner panel 23 via the outer panel 21. At this time, since the front end portion 52 and the rear end portion 51 of the bonnet hood 20 are supported by the hood support portion 16 and the hinge 13, respectively, stress concentrates on the bead portion 28 of the inner panel 23, and the inner panel 23 is beaded. The portion 28 extends forward from the starting point. That is, a portion of the inner panel 23 in front of the bead portion 28 is displaced toward the front. Thereby, the forward extension of the piston rod 54 of the damper stay 50 is permitted, and the deformation of the bonnet hood 20 can be suppressed from being inhibited by the damper stay 50.

As described above, in this embodiment, the bead portion 28 functions as a stress concentration portion serving as a starting point of deformation extending in front of the inner panel 23.
According to the vehicle front structure according to the present embodiment described above, the following effects can be obtained.

  (1) The damper stay 50 is supported on the vehicle body side, and the front end portion 51 is positioned on the front side of the rear end portion 51 when the hood 20 is in the closed position, and is supported on the inner panel 23 side. And have. On the rear side of the front bracket 40 that supports the front end portion 52 of the inner panel 23 of the bonnet hood 20, a bead portion 28 serving as a stress concentration portion that extends to the front of the inner panel 23 is adjacent to the front bracket 40. Is formed.

According to such a structure, it can suppress that the impact-absorbing performance by the bonnet food | hood 20 is impaired by the damper stay 50 by having the said effect | action.
(2) The inner panel 23 is positioned behind the vertical wall 27, the mounting wall 26 to which the front bracket 40 is mounted, the vertical wall 27 extending upward from the rear end of the mounting wall 26. In addition, the rear wall portion 29 has a vertical distance from the outer panel 21 that is smaller than the mounting wall portion 26. The bead portion 28 as a stress concentration portion is formed between the vertical wall portion 27 and the rear wall portion 29.

  According to such a configuration, when the inner panel 23 extends forward from the bead portion 28, the vertical wall portion 27 is pushed forward of the vehicle. For this reason, the front bracket 40 is largely pushed forward by the height of the vertical wall portion 27. Thereby, the damper stay 50 can be extended greatly and the deformation | transformation of the hood hood 20 can be accelerated | stimulated. Therefore, the impact absorption performance by the hood hood 20 can be enhanced.

(3) The stress concentration portion is constituted by a bead portion 28 that extends along the vehicle width direction and protrudes toward the outer panel 21 side.
According to such a configuration, the stress concentration portion can be easily formed by forming the bead portion 28 extending along the vehicle width direction on the inner panel 23.

<Modification>
In addition, the said embodiment can also be changed as follows, for example.
-The stress concentration part which concerns on this invention is not limited to the bead part 28 illustrated in the said embodiment. For example, as shown in FIG. 4, a through hole 228 that extends along the vehicle width direction across the vertical wall portion 27 and the rear wall portion 29 of the inner panel 23 may be formed. In this case, the through hole 228 functions as a stress concentration portion. Although not shown in the drawings, a thin portion having a partially reduced thickness may be extended along the vehicle width direction across the vertical wall portion 27 and the rear wall portion 29. In this case, the thin portion functions as a stress concentration portion.

  -The height of the vertical wall part 27 can also be changed suitably. Further, the vertical wall portion 27 can be omitted. In this case, a stress concentration part such as a bead part may be formed between the mounting wall part 26 and the rear wall part 29.

  DESCRIPTION OF SYMBOLS 10 ... Engine room (accommodating part), 11 ... Upper opening, 12 ... Cowl side panel, 13 ... Hinge, 14 ... Radiator core support, 15 ... Elastic member, 16 ... Hood support part, 17 ... Strut tower, 20 ... Bonnet hood 21 ... Outer panel, 22 ... Outer edge part, 23 ... Inner panel, 24 ... Outer edge part, 25 ... Front wall part, 26 ... Mounting wall part, 27 ... Vertical wall part, 28 ... Bead part (stress concentration part), 29 ... Rear wall portion, 30 ... rear bracket, 40 ... front bracket (front support portion), 50 ... damper stay, 51 ... rear end portion, 52 ... front end portion, 53 ... cylinder, 54 ... piston rod, 55 ... rear side mounting portion 56: Front mounting portion, 228: Through hole.

Claims (3)

A hood that opens and closes an upper opening of a housing portion provided in a front portion of the vehicle, a hinge that is provided between a rear end portion of the hood and the vehicle body, and supports the hood so as to be swingable; A hood support portion that supports a front end portion of the hood at the closed position of the hood, and a damper stage that is swingably supported by the hood and the vehicle body and biases the hood from the closed position toward the open position; In the vehicle front structure comprising:
The hood includes an outer panel that constitutes an outer surface of the vehicle, and an inner panel provided on the inner side of the outer panel,
The damper stay has a rear end portion supported on the vehicle body side, and a front end portion located on the front side of the rear end portion and supported on the inner panel side when the hood is in the closed position. ,
On the rear side of the front support portion that supports the front end portion of the inner panel, a stress concentration portion that is a starting point of deformation extending forward of the inner panel is formed adjacent to the front support portion.
Vehicle front structure. The inner panel is located on the mounting wall portion to which the front support portion is mounted, a vertical wall portion extending upward from a rear end of the mounting wall portion, and a rear side of the vertical wall portion, and the outer panel. And a rear wall portion whose upper and lower intervals are made smaller than the mounting wall portion,
The stress concentration portion is formed between the vertical wall portion and the rear wall portion.
The vehicle front structure according to claim 1. The stress concentration portion is configured by a bead portion extending along the vehicle width direction and projecting toward the outer panel side, or a through hole extending along the vehicle width direction.
The front part structure of the vehicle according to claim 1 or 2.

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