JP2008174108A - Hood structure of automobile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hood structure of an automobile equipped with a hood hinge reinforcement capable of securing torsional rigidity and flexural rigidity of a hood and adjusting impact force for easing impact on a head of a pedestrian between an outer panel and an inner panel of a hood side part. <P>SOLUTION: The hood structure is attached to the hood hinge reinforcement 5 constituted by the outer panel 1a and the inner panel 1b and having rear end both sides extended in the longitudinal direction of the hood between the outer panel 1a and the inner panel 1b of the hood side part by a hood hinge bolt 7 through a hinge arm 6 so as to be opened and closed with respect to the vehicle body. In the hood hinge reinforcement 5, the vicinity of the hood hinge bolt 7 is a groove like channel type cross section forming flange walls 8 and 9 on inner and outer sides of the vehicle, and a part positioned above a suspension tower of a front wheel is an L shaped angle type cross section by a bottom surface of the hood hinge reinforcement 5 and a flange wall 8a of the vehicle inner side. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an automobile hood structure having improved pedestrian protection performance.

  The hood of an automobile has a hood hinge reinforcement extending between the outer panel and the inner panel of the hood side (feeder part) in the front and rear direction of the hood. A hood hinge bolt is attached to the vehicle body via a hinge arm so as to be opened and closed.

  The hood hinge reinforcement is a reinforcing member for torsional rigidity of the hood and bending rigidity at the time of opening and closing. The form of this hood hinge rein hose men is a groove-shaped channel type cross-sectional shape with protector flange walls formed on the inside and outside so that the pedestrian's head does not hit the hood hinge bolt, and the impact of the hood side part Extends ahead of the hood to increase initial pedestrian head deceleration.

However, the conventional hood hinge reinforcement has the following problems.
(1) The groove-shaped channel-shaped hood hinge reinforcement has a protector-like flange wall that is effective for protecting the pedestrian by increasing the deceleration of the pedestrian head at the initial stage of impact. If the flange wall is not crushed, the effective clearance to the bottom is shortened.
(2) Design designs related to the merchandise of automobiles tend to lower the hood and fender. As a result, the clearance with the upper member, apron, front wheel suspension tower, etc., which are the hard structures below it, is reduced, and there is a difficulty in the effectiveness of impact force absorption (kinetic energy absorption) to mitigate the impact, and walking It is necessary to achieve both personal protection performance and other performance (torsional rigidity and flexural rigidity of the hood).
(3) Due to the lack of space between the outer panel and inner panel of the hood side, it is difficult to provide a structure such as a fold notch for crushing the flange wall of the hood hinge reinforcement.
(4) Therefore, from the above three points, if there is no hood hinge reinforcement, the pedestrian's head at the beginning of impact will collide with a hard structure without sufficient deceleration, but the impact damage with the bottom will increase. On the other hand, when the hood hinge reinforcement is present, the effective clearance is short, and the bottom impact of the pedestrian's head eventually becomes large (two points in FIG. 6). Chain line b). That is, both do not reduce the pedestrian head injury value (HIC).
JP 2001-233248 A JP 2002-337742 A Japanese Patent Laid-Open No. 2005-239092

  The object of the present invention is to adjust the impact force (kinetic energy absorption) for securing the torsional rigidity and the flexural rigidity of the hood between the outer panel and the inner panel of the hood side part, and to reduce the impact of the pedestrian head. An object of the present invention is to provide an automobile hood structure having a hood hinge reinforcement.

  In order to achieve the above object, the present invention, as set forth in claim 1, is composed of an outer panel that constitutes the outer surface of the hood body and an inner panel that is disposed below the outer panel. A hood structure in which a hood hinge reinforcement that extends in the front-rear direction of the hood between an outer panel and an inner panel of the hood side portion is attached to a vehicle body via a hinge arm by a hood hinge bolt so as to be opened and closed. The hinge reinforcement has a groove-shaped channel-shaped cross section with a flange wall formed inside and outside the vehicle at the periphery of the hood hinge bolt, and the portion located at the top of the suspension tower of the front wheel is an L-shaped angle-shaped cross section. It is characterized by having a shape.

  According to the present invention, the form of the hood hinge reinforcement described above enables effective clearance between the hood and the fender parting portion and the bottom of the pedestrian head impact bottom while satisfying both the torsional rigidity and the bending rigidity of the hood. This makes it possible to adjust the balance of the energy absorption performance of the pedestrian and to reduce the impact damage and head damage value (HIC) on the head during the impact process of the pedestrian head.

  The best mode for carrying out the present invention will be described below with reference to the drawings. 1 to 3, reference numeral 1 denotes an automobile hood, which is composed of an outer panel 1a constituting the outer side of the vehicle body and an inner panel 1b arranged below the outer panel 1a. A hood hinge reinforcement 5 extending in the front-rear direction of the hood 1 between the outer panel 1a and the inner panel 1b of the feeder 3) is detachably attached to the vehicle body via a hinge arm 6 with a hood hinge bolt 7. It has been. Reference numeral 4 denotes a suspension tower for the front wheels.

  Therefore, the present invention is characterized in the form of the hood hinge reinforcement 5 in the above structure, and the details thereof will be described below with reference to FIGS. 4 and 5.

  As shown in FIG. 4, the hood hinge reinforcement 5 has a groove-like channel-shaped cross-sectional shape in which the periphery A of the hood hinge bolt 7 portion is formed with a flange wall 8 inside the vehicle and a flange wall 9 outside the vehicle. A portion B located at the top of the suspension tower 4 is continuous with the flange wall 8 inside the vehicle, and has a flange wall 8a inside the vehicle that is lower than the height of the flange wall 8 inside the vehicle. It is the form made into the L-shaped angle type cross-sectional shape which does not have. As shown in FIG. 5, the flange wall 8 on the vehicle inner side and the flange wall 9 on the vehicle outer side have a height H2 that is lower than the height H1 of the vehicle inner flange wall 8 as shown in FIG. <H1 is desirable.

  Since the present invention has the structure as described above, the hood hinge bolt 7 has a groove-like channel-shaped cross section formed with a flange wall 8 inside the vehicle and a flange wall 9 outside the vehicle. Protect it from hitting the hinge bolt.

  The upper portion of the suspension tower 4 (or the upper portion of the apron) where the effective clearance is insufficient has a flange wall 8a on the vehicle inner side lower than the height of the flange wall 8 on the vehicle inner side, and there is no flange on the vehicle outer side (the flange on the vehicle outer side). An effective clearance is ensured by forming an L-shaped angle-shaped cross-sectional shape.

  The reason why the hood has a flange wall 8a on the vehicle inner side lower than the height of the flange wall 8 on the vehicle inner side and has no flange on the vehicle outer side (the flange on the vehicle outer side is cut) is an L-shaped angle-shaped cross section. The bottom surface of the hinge reinforcement 5 and the flange wall 8a on the inner side of the vehicle have little influence on the clearance between the hood 1 and the parting part of the fender 3, and the impact is not limited to local deformation, but a wider range of inner panels. 1b is deformed, and the amount of decrease in the initial impact deceleration is reduced.

  In addition, since the bottom surface of the hood hinge reinforcement 5 and the flange wall 8a on the inside of the vehicle have an L-shaped angle-shaped cross-sectional shape, the torsional rigidity and the bending rigidity of the hood 1 are reduced and walking is reduced. Person protection performance can be satisfied.

  In the case of the present invention, as shown by the solid line c in FIG. 6, the energy absorption before bottoming and the effective clearance can be adjusted in a well-balanced manner, and the impact on the head during the impact process of the pedestrian head Damage, head damage value (HIC) is reduced.

  As described above, in the present invention, the pedestrian protection performance in the area can be improved by improving the conventional problems in the hood side part (fender parting part), and the overall pedestrian protection score level (J- NCAP, Euro-NCAP).

The perspective view which shows the principal part of this invention The front view which shows the principal part of this invention The perspective view of the inner panel which shows the principal part of this invention The perspective view of the hood hinge reinforcement used for this invention Sectional view of part A in Fig. 4 of the hood hinge reinforcement Comparison of deceleration vs. stroke waveform between conventional and present invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hood 1a Outer panel 1b Inner panel 3 Fender 4 Suspension tower 5 Hood hinge reinforcement 6 Hinge arm 7 Hood hinge bolt 8 Flange wall inside the vehicle 8a Flange wall inside the vehicle 9 Flange wall outside the vehicle

Claims (1)

  It consists of an outer panel that forms the vehicle body outer surface of the hood and an inner panel that is arranged below the outer panel, and both rear end sides extend between the outer panel and the inner panel of the hood side portion in the front-rear direction of the hood. The hood hinge reinforcement is attached to the hood hinge reinforcement so that it can be opened and closed by a hood hinge bolt via a hinge arm. 1. A hood structure for an automobile, wherein the groove-shaped channel-shaped cross-sectional shape is formed, and the portion of the front wheel located above the suspension tower is an L-shaped angle-shaped cross-sectional shape.

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