JP6090206B2 - Bumper cover retainer, radiator grille and vehicle front structure - Google Patents

Description

  The present invention relates to a bumper cover retainer, a radiator grill, and a vehicle front structure.

  At the front of the vehicle, a radiator grill disposed on the upper part of the front bumper cover is attached to the radiator support upper via a bumper cover retainer disposed on the rear side of the radiator grill.

  By the way, in recent years, in order to reduce the impact on the pedestrian's leg at the time of frontal collision of the vehicle with respect to the pedestrian, a structure has been adopted for the vehicle that deforms the front bumper cover and the like rearward at the time of the collision. At this time, it has been proposed that the bumper cover retainer is deformed to move the bumper cover to the rear of the vehicle (see Patent Document 1).

  In recent years, a pressure chamber has been installed on the vehicle rear side of the front bumper cover, and by detecting deformation (pressure fluctuation) of the pressure chamber at the time of a pedestrian collision, it is possible to quickly detect a pedestrian collision and lift the hood. In some cases, a structure (hereinafter referred to as “pop-up hood”) that reduces the impact on the pedestrian's head is employed.

JP 2007-1546 A

  Considering the improvement of pedestrian protection in the pop-up hood as described above, it is preferable to increase the deformation amount of the bumper cover retainer in order to increase the deformation amount of the pressure chamber and improve the detection sensitivity of the pedestrian collision. .

  On the other hand, the bumper cover retainer supports the radiator grille and the front bumper cover, and the support rigidity in the vertical direction of the vehicle is preferably high.

  Thus, in the bumper cover retainer, there is room for improvement in order to improve the rigidity in the vehicle vertical direction while increasing the amount of deformation in the vehicle front-rear direction.

  In view of the above facts, the present invention provides a bumper cover retainer, a radiator grille, and a vehicle front structure that increase the amount of deformation at the time of vehicle longitudinal load input while ensuring a predetermined rigidity in the vehicle vertical direction. Objective.

In the invention of claim 1, a bumper cover retainer main body that holds at least the radiator grille and extends in the vehicle width direction on the vehicle rear side of the radiator grille;
A grill mounting portion to which the upper end portion side of the radiator grill is attached in the bumper cover retainer body, a vehicle body mounting portion to be attached to the vehicle body on the vehicle rear side of the grill mounting portion in the bumper cover retainer body, and the bumper cover retainer body And a bumper cover retainer body provided on the vehicle rear side of the grille mounting portion and on the vehicle front side of the vehicle body mounting portion and having a locally lower rigidity with respect to the input load in the vehicle longitudinal direction than other portions. A reinforcing portion that is provided closer to the vehicle body attachment portion than the fragile portion and has a locally higher rigidity against an input load in the vehicle vertical direction than other portions, and a front bumper cover attached to the lower end side of the radiator grille The front end of the front side member on the vehicle rear side of the front bumper cover And a pressure chamber arranged on the vehicle front side of the front bumper reinforcement provided.

  The bumper cover retainer of the present invention is provided with a weak portion that is locally lower in rigidity with respect to the vehicle longitudinal load than the other portions between the grill attachment portion and the vehicle body attachment portion of the bumper cover retainer body in the vehicle longitudinal direction. . Accordingly, when a vehicle longitudinal load is input from the radiator grill at the time of a frontal collision of the vehicle, the bumper cover retainer body is deformed starting from the weakened portion, and the deformation amount of the bumper cover retainer body is increased.

  On the other hand, the bumper cover retainer is provided with a reinforcing portion against the vehicle vertical direction load on the vehicle body mounting portion side of the bumper cover retainer body with respect to the weak portion. In other words, by supporting the radiator grille and the front bumper cover, a reinforcing part with locally higher rigidity against the vehicle vertical load than the other parts is provided on the side of the vehicle body mounting part where the moment due to the vehicle vertical load is large. Therefore, displacement in the vehicle vertical direction can be effectively suppressed.

  As described above, the bumper cover retainer of the present invention is provided with the weakened portion closer to the grill attaching portion than the reinforcing portion on the vehicle body attaching portion side, thereby suppressing the weakened portion from damaging the function of the reinforcing portion. Therefore, it is possible to increase the amount of deformation in the vehicle front-rear direction when a vehicle front-rear direction load is input while ensuring a predetermined support rigidity for the front bumper cover and the radiator grille.

  According to a second aspect of the present invention, in the first aspect of the present invention, the weakened portion is a portion where the bumper cover retainer body is bent in a direction perpendicular to the vehicle front-rear direction.

  In this bumper cover retainer, since the fragile portion is a portion where the bumper cover retainer body is bent in a direction perpendicular to the vehicle longitudinal direction, the amount of deformation of the bumper cover retainer body when the vehicle longitudinal load is input increases and the fragile portion is weak. Processing of part formation is easy.

  According to a third aspect of the present invention, in the first or second aspect of the invention, the reinforcing portion is a bead in which the bumper cover retainer main body extends in the vehicle front-rear direction and protrudes in the vehicle vertical direction.

  In this bumper cover retainer, the reinforcing portion extends in the vehicle front-rear direction and is a bead that protrudes from the bumper cover retainer body in the vehicle vertical direction. Easy to process.

  According to a fourth aspect of the present invention, there is provided a radiator grill disposed at the front end portion of the vehicle and extending in the vehicle width direction, provided on the vehicle rear side of the radiator grill, and for mounting the radiator grill on the vehicle body side. A bumper cover retainer according to any one of 3 above.

  In this vehicle front structure, since the radiator grille is attached to the bumper cover retainer according to any one of claims 1 to 3, sufficient rigidity for supporting the vehicle vertical load from the radiator grill is ensured and the vehicle longitudinal load input is provided. The amount of deformation with respect to can be increased.

In a fifth aspect of the present invention, a radiator grill body that is disposed at the front end portion of the vehicle and extends in the vehicle width direction is provided on the vehicle rear side of the radiator grill body, and the upper end portion side of the radiator grill body is directed to the vehicle body side. A mounting portion for mounting, a vehicle body mounting portion that is mounted on the vehicle body side at the mounting portion, and a radiator that is provided closer to the radiator grill body than the vehicle body mounting portion at the mounting portion. A weaker portion that is locally lower than the portion, and a reinforcing portion that is provided closer to the vehicle body mounting portion than the weakened portion in the mounting portion and has a locally higher rigidity with respect to the input load in the vehicle vertical direction than the other portions, A front bumper cover attached to a lower end side of the radiator grill body, and a front side member on a vehicle rear side of the front bumper cover. It comprises a pressure chamber arranged on the vehicle front side of the front bumper reinforcement provided at the front end of, the.

  In the radiator grill of the present invention, the mounting portion provided on the vehicle rear side of the radiator grill main body has a rigidity with respect to the vehicle longitudinal direction load on the vehicle front side of the vehicle body mounting portion and on the vehicle rear side of the radiator grill main body. Since a weaker portion is provided that is locally lower than the front portion of the vehicle, when a load in the longitudinal direction of the vehicle is input from the radiator grill body, the attachment portion is deformed starting from the weak portion, and the radiator grill (attachment portion) The amount of deformation increases.

  Further, the attachment portion is provided with a reinforcing portion against the vehicle vertical load on the vehicle body attachment portion side of the weak portion. In other words, the mounting part supports the radiator grille body, so that the moment due to the vehicle vertical load acting on the mounting part becomes large. Since the part is provided, the vehicle vertical displacement can be effectively suppressed.

  As described above, in the radiator grill of the present invention, the weak portion is suppressed from damaging the function of the reinforcing portion by providing the weak portion on the front side of the vehicle with respect to the reinforcing portion on the vehicle body attaching portion side in the attaching portion. Therefore, it is possible to increase the amount of deformation in the vehicle front-rear direction of the mounting portion when the vehicle front-rear direction load is input while securing the support rigidity of the mounting portion with respect to the front bumper cover and the radiator grille body.

  According to a sixth aspect of the present invention, the radiator grill is attached to the vehicle body via the vehicle body attachment portion of the radiator grill according to the fifth aspect.

  In this vehicle front part structure, since the radiator grille is attached to the vehicle body via the radiator grille body attachment part according to claim 5, sufficient support rigidity of the attachment part against the vehicle vertical load from the radiator grill body is sufficiently secured. In addition, the amount of deformation of the mounting portion with respect to the vehicle longitudinal load input can be increased.

  Since the present invention is configured as described above, it is possible to ensure a large amount of deformation in the vehicle front-rear direction when a load is input in the vehicle front-rear direction while ensuring a predetermined support rigidity in the vehicle vertical direction.

It is a perspective view of the bumper cover retainer concerning a 1st embodiment of the present invention. It is a longitudinal section showing the vehicle front part structure concerning a 1st embodiment of the present invention. It is a longitudinal cross-sectional view which shows the deformation | transformation state at the time of the vehicle front-back direction load input of the vehicle front part structure which concerns on 1st Embodiment of this invention. It is a schematic diagram explaining the effect | action of the moment by the vehicle up-down direction load with respect to the bumper cover retainer which concerns on 1st Embodiment of this invention. It is a longitudinal cross-sectional view which shows the vehicle front part structure which concerns on 2nd Embodiment of this invention.

[First Embodiment]

  A bumper cover retainer and a vehicle front structure according to a first embodiment of the present invention will be described with reference to FIGS. Hereinafter, in each figure, the arrow FR indicates the front of the vehicle, the arrow UP indicates the vehicle upper direction, and the arrow W indicates the vehicle width direction. Various members are disposed on the bumper cover retainer, but members not related to the gist of the present invention are not shown.

  As shown in FIG. 2, a front bumper 10 is disposed at the front of the vehicle. The front bumper 10 includes a front bumper cover 12 extending along the vehicle width direction. As shown in FIG. 2, the front bumper cover 12 is divided into an upper cover 12A and a lower cover 12B.

  Front bumper reinforcements 14A and 14B are disposed on the vehicle rear side of the front bumper cover 12 at a predetermined distance from the upper cover 12A and the lower cover 12B. The front bumper reinforcements 14A and 14B are rectangular in cross section and joined to the front end of the front side member 16 at both ends in the vehicle width direction.

  A front end portion of the hood 20 for opening and closing the engine room 18 is disposed on the vehicle upper side of the front bumper reinforcement 14A. The hood 20 is formed of a hood outer panel 22 and a hood inner panel 24.

  A radiator grill 26 is disposed on the vehicle upper side of the upper cover 12A at the center of the front bumper cover 12 in the vehicle width direction. The radiator grille 26 includes a main body 28 having an opening, a mounting portion 30 for fastening to the upper cover 12A on the lower end side of the main body 28, and a main body 28 for fastening to a bumper cover retainer 42 described later. And an attachment portion 32 extending from the upper end to the vehicle rear side.

  Holes 34 and 36 are formed in the attachment part 30 and the upper cover 12A of the radiator grill 26, and the attachment part 30 and the upper cover 12A are fastened by bolts 38 and nuts 40 inserted through the holes 34 and 36.

  As shown in FIG. 2, a bumper cover retainer (grill retainer) 42 is disposed on the upper end side of the radiator grill 26 and on the vehicle rear side.

  As shown in FIG. 1, the bumper cover retainer 42 is provided on a vehicle body side extending in the vehicle width direction and on both the vehicle width direction both ends and the center of the vehicle rear side, not shown in more detail. Mounting portions 46A to 46C for mounting directly on a vertical column or the like of the radiator support upper via a bracket.

  The main body 44 is a portion to which the radiator grille 26 (attachment portion 32) is attached, and a plurality of projecting fastening portions 48A to 48E are formed on an upper portion of a flat plate extending in the vehicle width direction. Fastening holes 50A to 50E are formed in the fastening parts 48A to 48E, respectively. The bolts 54 inserted through the holes 50A to 50E of the fastening portions 48A to 48E and the hole 52 (see FIG. 1) of the mounting portion 32 of the radiator grille 26 are fastened with nuts 56, whereby the bumper cover retainer 42 is attached to the radiator. A grill 26 is attached.

  As for attachment part 46A, 46B, the hole parts 58A-58C are provided in the fastening parts 57A-57C for attaching to the radiator support upper (or the bracket for attaching to a radiator support upper) which is not illustrated in the vehicle rear end side.

  In addition, ribs 60A and 60B projecting upward from the vehicle in the main body portion 44 are formed in the attachment portions 46A and 46B so as to extend in the vehicle front-rear direction to the fragile portions 62A and 62B described later. The ribs 60A and 60B locally improve the rigidity against the vehicle vertical load.

  Further, on the main body 44 (vehicle front) side of the mounting portions 46A and 46B, fragile portions 62A and 62B are formed by bending a plate body forming the bumper cover retainer 42 in the vehicle vertical direction. Due to the fragile portions 62A and 62B, the rigidity with respect to the vehicle longitudinal load is locally reduced.

  As shown in FIG. 2, between the front bumper reinforcement 14B and the lower cover 12B, a front bumper lower absorber 64 having a substantially rectangular cross section is attached to the front bumper reinforcement 14B via a support member 66B. ing. On the other hand, between the upper cover 12A and the front bumper reinforcement 14A, a front bumper upper absorber 68 is disposed on the front side of the vehicle, and a substantially rectangular pressure chamber 70 is formed on the rear side of the vehicle. The absorbers 64 and 68 reduce the impact on a pedestrian or the like by being deformed when a vehicle front-rear direction load is input to the front bumper cover 12, and the pressure chamber 70 is caused by pressure fluctuation due to the deformation. While detecting the collision of a pedestrian etc., it reduces the impact to a pedestrian by changing.

  The operation of the bumper cover retainer 42 and the vehicle front structure thus formed will be described.

  When the impactor collides with the front part of the vehicle, the upper cover 12A and the lower cover 12B of the front bumper cover 12 are displaced in the approaching direction, and move to the vehicle rear side accordingly. Further, the vehicle longitudinal load is input from the radiator grill 26 to the fastening portions 48A to 48E of the bumper cover retainer 42.

  Here, between the fastening portions 48A, 48E of the bumper cover retainer 42 and the attachment portions 46A, 46B with respect to the radiator support upper, weak portions 62A, 62B are formed by bending the plate body in the vehicle vertical direction. The rigidity in the vehicle front-rear direction is locally lower than the other parts. Therefore, the bumper cover retainer 42 is deformed starting from the fragile portions 62A and 62B, and the deformation amount of the bumper cover retainer 42 in the vehicle front-rear direction is increased (see FIGS. 2 to 3).

  That is, as shown in FIG. 3, due to the deformation of the fragile portions 62A and 62B of the bumper cover retainer 42, the vehicle front side portions (fastening portions 48A to 48E) of the bumper cover retainer 42 from the fragile portions 62A and 62B. Displace to the side. As a result, the upper cover 12A can sufficiently move to the rear of the vehicle. As a result, the pressure chamber 70 pressed by the front bumper upper absorber 68 is largely crushed between the support member 66A and the detection sensitivity of the pedestrian collision can be improved.

  On the other hand, the bumper cover retainer 42 supports the radiator grille 26 and the front bumper cover 12 via the fastening portions 48A to 48E, but the moment due to the vehicle vertical load acting from the fastening portions 48A and 48E acts to the maximum. Since the ribs 60A and 60B are provided on the fastening portions 57A and 57B of the mounting portions 46A and 46B to be deformed, deformation in the vehicle vertical direction is suppressed.

  That is, as shown in FIG. 4, the distance between the fastening portion 48E and the fastening portion 57B will be described with a simple schematic diagram. The distance X and the moment M from the fastening portion 48E that is the input position of the vehicle vertical load Fv to the fastening portion 57B are as follows. Proportional relationship (M = Fv × X). Therefore, by providing the rib 60B at the position of the fastening portion 57B in the vehicle front-rear direction where the largest moment M acts, the vehicle vertical direction rigidity can be strengthened most effectively.

  On the other hand, since the vehicle longitudinal load Fh acting from the fastening portions 48A to 48E acts as an axial force on the attachment portions 46A to 46C, the vehicle longitudinal direction position X in the attachment portions 46A to 46C is any position. The same force is applied. Therefore, in order not to impair the reinforcing action of the ribs 60A and 60B, the fragile portions 62A to 62B are formed by bending the plate body in the vehicle vertical direction on the vehicle front side (main body portion 44) side of the ribs 60A and 60B in the mounting portions 46A and 46B. 62C is provided to reduce the rigidity in the longitudinal direction of the vehicle.

  Thus, by forming the ribs 60A and 60B and the fragile portions 62A and 62B on the bumper cover retainer 42, the mutual action is prevented from being canceled, and the vehicle is improved in rigidity against the vehicle vertical direction load. A reduction in rigidity with respect to the longitudinal load, that is, an increase in deformation can be achieved. As a result, the amount of deformation of the radiator grill 26 fastened to the bumper cover retainer 42 and the upper cover 12A fastened to the radiator grill 26 can be increased, and the amount of deformation (the amount of deformation) of the pressure chamber 70 can be increased. As a result, the amount of deformation of the pressure chamber 70 with respect to a pedestrian collision can be increased and detection sensitivity can be improved.

  In this embodiment, the ribs 60A and 60B are provided on the mounting portions 46A and 46B at both ends in the vehicle width direction of the bumper cover retainer 42, and the weak portions 62A and 62B are formed on the mounting portions 46A and 46B. If a reinforcement part and a weak part are formed in one fastening part, it corresponds to this invention.

  In the present embodiment, the present invention is applied to the vehicle front structure having the pressure chamber 70, but it is needless to say that the present invention can be applied to a vehicle front structure having no pressure chamber.

  In the present embodiment, the fragile portions 62A and 62B are formed by bending the plate constituting the bumper cover retainer 42 in the vehicle vertical direction in the vehicle side view, but in the direction perpendicular to the vehicle longitudinal direction. If it is good. For example, it may be bent in the vehicle width direction in plan view.

  Further, in the present embodiment, the fragile portions 62A and 62B are formed by bending a flat plate, but may be any one that locally lowers the vehicle longitudinal rigidity, and may be a flat plate bending or notch. Furthermore, in the present embodiment, the ribs 60A and 60B may be any member that locally improves the rigidity in the vehicle vertical direction, such as a flange.

[Second Embodiment]

  Next, a radiator grille and a vehicle front structure according to a second embodiment of the present invention will be described with reference to FIG. In addition, the same referential mark is attached | subjected to the component similar to 1st Embodiment, and the detailed description is abbreviate | omitted.

  As shown in FIG. 5, the radiator grill 26 according to the present embodiment has a mounting portion 80 (corresponding to the bumper cover retainer of the first embodiment) formed integrally with the main body portion 28 on the vehicle rear side of the main body portion 28. It is a thing.

  The attachment portion 80 is formed on the vehicle rear side from the upper end portion of the radiator grill 26. Moreover, the attachment part 80 has the main-body part 44 and attachment part 46A-46C extended in a vehicle width direction similarly to the bumper cover retainer 42 of 1st Embodiment. Further, ribs 60A and 60B are formed on the side of the fastening portions 57A and 57B to be attached to the radiator support upper in the mounting portions 46A and 46B, and the weakened portion 62A is closer to the main body portion 28 side of the mounting portions 46A and 46B than the ribs 60A and 60B. , 62B are formed.

  Thus, even when the attachment portion 80 is integrally formed with the radiator grille 26 (the radiator grille 26 is directly attached to the vehicle body), the configuration of the attachment portion 80 (attachment portions 46A and 46B) can be devised. Further, the support rigidity in the vehicle vertical direction can be ensured while the rigidity in the vehicle front-rear direction of the mounting portion 80 is reduced (the amount of deformation is increased).

12 Front bumper cover 26 Radiator grill 28 Main body (radiator grill main body)
42 Bumper cover retainer 44 Body (Bumper cover retainer body)
46A-46C Mounting part (Bumper cover retainer body)
48A to 48E Fastening part (grill mounting part)
57A-57C Fastening part (vehicle body attachment part)
60A, 60B rib (reinforcement part)
62A, 62B Weak part 80 Mounting part

Claims (6)

A bumper cover retainer body that holds at least the radiator grille and extends in the vehicle width direction on the vehicle rear side of the radiator grille;
A grill attaching portion to which an upper end portion side of the radiator grill is attached in the bumper cover retainer body;
A vehicle body attachment portion attached to the vehicle body side on the vehicle rear side of the grill attachment portion in the bumper cover retainer body;
In the bumper cover retainer main body, a fragile portion that is provided on the vehicle rear side of the grill mounting portion and on the vehicle front side of the vehicle body mounting portion, and has a locally lower rigidity with respect to an input load in the vehicle front-rear direction than other portions,
In the bumper cover retainer main body, a reinforcing portion that is provided closer to the vehicle body mounting portion than the fragile portion and has locally higher rigidity with respect to an input load in the vehicle vertical direction than other portions;
A front bumper cover attached to the lower end side of the radiator grill;
A pressure chamber disposed on a vehicle front side of a front bumper reinforcement provided at a front end portion of a front side member on a vehicle rear side of the front bumper cover;
Bumper cover retainer.   2. The bumper cover retainer according to claim 1, wherein the weakened portion is a portion obtained by bending the bumper cover retainer main body in a direction orthogonal to a vehicle front-rear direction.   The bumper cover retainer according to claim 1 or 2, wherein the reinforcing portion is a bead in which the bumper cover retainer main body extends in the vehicle front-rear direction and protrudes in the vehicle vertical direction. A radiator grill disposed at the front end of the vehicle and extending in the vehicle width direction;
The bumper cover retainer according to any one of claims 1 to 3, wherein the bumper cover retainer according to any one of claims 1 to 3 is provided on a vehicle rear side of the radiator grill and is attached to the vehicle body side.
A vehicle front structure comprising: A radiator grill body disposed at the front end of the vehicle and extending in the vehicle width direction;
An attachment portion that is provided on the vehicle rear side of the radiator grill body, and for attaching the upper end portion side of the radiator grill body to the vehicle body side;
A vehicle body attachment portion attached to the vehicle body side in the attachment portion;
A fragile portion that is provided closer to the radiator grill body than the vehicle body mounting portion in the mounting portion, and has a locally lower rigidity with respect to an input load in the vehicle longitudinal direction than other portions;
A reinforcing portion that is provided closer to the vehicle body mounting portion than the fragile portion in the mounting portion, and has locally higher rigidity with respect to an input load in the vehicle vertical direction than other portions;
A front bumper cover attached to the lower end side of the radiator grill body;
A pressure chamber disposed on a vehicle front side of a front bumper reinforcement provided at a front end portion of a front side member on a vehicle rear side of the front bumper cover;
Radiator grill with   The vehicle front part structure which attaches the said radiator grille to a vehicle body via the vehicle body attachment part of the radiator grille of Claim 5.

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