JP2006256463A - Front bumper structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a front bumper capable of improving protecting performance of a leg portion of a pedestrian at the time of frontal collision with the pedestrian, without causing disadvantage such as an increase in vehicle body weight. <P>SOLUTION: An energy absorbing member 18 of a front bumper 10 is offset and disposed in a vehicular lower side to a front bumper reinforce 20. Therefore, a center position Q of a distribution of stress generated in the energy absorbing member 18 is separated from a knee position X at the time of the frontal collision to the pedestrian, so that the protecting performance of the leg portion of the pedestrian can be improved. The structure changes the layout of the energy absorbing member 18, so that a special mounting bracket or the like is not needed, and disadvantage such as an increase in weight is prevented. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a front bumper structure that includes an energy absorbing member that is interposed between a front bumper cover and a front bumper reinforcement and absorbs predetermined energy at the time of a frontal collision.

  In recent years, techniques for protecting a pedestrian's leg at the time of a frontal collision with a pedestrian have been actively developed.

  For example, in Patent Document 1 below, a mounting bracket formed in a substantially L shape in a side view is attached to the lower part of a front bumper reinforcement having a rectangular cross section from the rear side, and the lower part of the mounting bracket is long in the vehicle width direction. The structure which arrange | positions the energy absorption member made into the shape of a scale is disclosed.

According to the above configuration, the lower side of the mounting bracket (the part below the lower surface of the front bumper reinforcement) is offset from the front surface of the front bumper reinforcement to the rear side of the vehicle. The thickness can be increased in the longitudinal direction of the vehicle, and the amount of energy absorption can be increased. Further, since the distance from the front bumper reinforcement to the front bumper cover is not increased, there is no restriction on the layout of the members.
JP 11-291844 A

  However, according to the above-described prior art, a mounting bracket is separately required to increase the thickness of the energy absorbing member, which increases the number of parts, leading to an increase in cost and an increase in the weight of the vehicle body. . In particular, when this configuration is adopted, an increase in vehicle body weight is inevitable because sufficient strength must be imparted to the mounting bracket.

  Moreover, with this type of technology, further improvement in the protection performance of the pedestrian's legs is expected in the event of a frontal collision with the pedestrian.

  In consideration of the above facts, the present invention can provide a front bumper structure that can improve the protection performance of a pedestrian's leg at the time of a frontal collision with a pedestrian without incurring disadvantages such as an increase in vehicle weight. Is the purpose.

  The front bumper structure according to the first aspect of the present invention includes a front bumper cover disposed along the vehicle width direction at a front end portion of the vehicle, and a front bumper cover spaced apart from the vehicle rear side of the front bumper cover. A front bumper reinforcement formed in a long shape along the direction, and interposed between the front bumper cover and the front bumper reinforcement and disposed along the front bumper reinforcement, a load exceeding a predetermined value is applied to the rear side of the vehicle. A longitudinal bumper structure that includes a long energy absorbing member that deforms and absorbs energy by acting, and has a distribution of stress in the vehicle vertical direction generated in the energy absorbing member during a frontal collision. If the center position matches the height of the energy absorbing member to the height of the front bumper reinforcement, When the vehicle is fully wrapped in the vertical direction of the vehicle, the shape and arrangement of the energy absorbing member are set such that the energy absorbing member is lowered to the vehicle lower side than the center position of the stress distribution generated in the energy absorbing member. Bumper structure.

  A front bumper structure according to a second aspect of the present invention is the front bumper structure according to the first aspect, wherein at least the lower end of the energy absorbing member is extended to the vehicle lower side than the lower surface of the front bumper reinforcement. It is a feature.

  The front bumper structure according to a third aspect of the present invention is the front bumper structure according to the second aspect of the present invention, wherein the energy absorbing member is configured such that the energy absorbing member has an upper end lower than an upper surface of the front bumper reinforcement. And the lower end is set at a position lower than the lower surface of the front bumper reinforcement.

  The front bumper structure according to a fourth aspect of the present invention is the front bumper structure according to the second or third aspect, wherein the energy absorbing member is located at a lower end lower than a lower surface of the front bumper reinforcement. The lower end of the front bumper reinforcement is extended to the lower surface side of the front bumper reinforcement.

  A front bumper structure according to a fifth aspect of the present invention is the front bumper structure according to the fourth aspect of the present invention, wherein the energy absorbing member is extended from the lower end portion of the energy absorbing member to the vehicle rear side so as to be on the lower surface side of the front bumper reinforcement. The arranged rear extension is connected to the lower surface of the front bumper reinforcement.

  The effect | action of this invention of Claim 1 is as follows.

  In general, the height of the energy absorbing member is determined by the height of the front bumper reinforcement, and the height of the front bumper reinforcement is determined by the height of the front side member. Then, the arrangement | positioning height of an energy absorption member becomes high, and there exists a tendency for the load input point to a leg part of a pedestrian from an energy absorption member to approach a pedestrian's knee.

  For example, when the height of the energy absorbing member is adjusted to the height of the front bumper reinforcement and the vehicle is fully wrapped in the vertical direction of the vehicle, when the front collision with the pedestrian occurs, the energy absorbing member is slightly below the knee of the pedestrian's leg. There is a possibility of inputting a collision load (collision reaction force) on the side. The center position in the vehicle vertical direction of the stress distribution generated in the energy absorbing member at this time is a position that is ½ of the height. However, here, the cross-sectional shape of the energy absorbing member is assumed to be a symmetrical shape such as a rectangular cross-section, and the hardness is uniform.

  From the above, when the height of the energy absorbing member is adjusted to the height of the front bumper reinforcement and the vehicle is fully wrapped in the vertical direction of the vehicle, the stress distribution of the energy absorbing member is relatively close to the pedestrian's leg knee. The center position of exists.

  On the other hand, in the present invention, the center position of the stress distribution in the vehicle vertical direction generated in the energy absorbing member during the frontal collision is lowered to the vehicle lower side than the center position of the stress distribution of the energy absorbing member for comparison. Since the shape and arrangement of the energy absorbing member are set, the center position of the stress distribution generated in the energy absorbing member during the frontal collision with the pedestrian moves away from the pedestrian's leg. For this reason, the foot wiping property (the effect of touching the pedestrian's leg) that rotates the pedestrian's leg around the knee is improved, and the burden on the pedestrian's leg is reduced accordingly. That is, the protection performance of the leg part of a pedestrian is improved.

  Moreover, in the present invention, the center position of the stress distribution in the vehicle vertical direction generated in the energy absorbing member is moved away (separated) by the shape and arrangement of the energy absorbing member. No separate parts are required.

  According to the second aspect of the present invention, since at least the lower end of the energy absorbing member is extended to the vehicle lower side than the lower surface of the front bumper reinforcement, the stress distribution in the vehicle vertical direction generated in the energy absorbing member correspondingly. Is lowered to the vehicle lower side.

  According to the third aspect of the present invention, the upper end of the energy absorbing member is set at a position lower than the upper surface of the front bumper reinforcement, and the lower end is set at a position lower than the lower surface of the front bumper reinforcement. Further, the center position of the stress distribution in the vehicle vertical direction generated in the energy absorbing member can be lowered to the vehicle lower side.

  Moreover, in the case of this invention of Claim 3, since the lower end part of an energy absorption member is not supported by front bumper reinforcement, when the collision load to a vehicle rear side is input into an energy absorption member, in the said lower end part A shearing force is generated at the lower surface of the front bumper reinforcement. Since the lower end portion of the energy absorbing member is pulled and deformed by the shearing force, a new energy absorbing effect is generated.

  In addition, the fact that the upper end portion of the energy absorbing member exists at a position lower than the upper surface of the front bumper reinforcement means that the energy absorbing member does not exist on the front side of the upper end portion of the front bumper reinforcement. Here, when the pedestrian's foot is paid at the time of a frontal collision with the pedestrian, the knee of the leg is the upper end of the energy absorbing member as a result of the rotational movement of the leg (the shin part below the knee) around the knee. Come down to the side. However, in the case of the present invention, since the energy absorbing member does not exist in that portion, the local reaction force input from the energy absorbing member to the pedestrian's knee can be reduced.

  According to the fourth aspect of the present invention, the lower end portion of the energy absorbing member is set at a position lower than the lower surface of the front bumper reinforcement, and the lower end portion is extended to the lower surface side of the front bumper reinforcement. The energy absorption effect by deform | transforming the formed part is also acquired. In particular, during a frontal collision with a pedestrian, when the heel is tilted toward the vehicle, more collision load is input from the leg portion to the lower end portion of the energy absorbing member. In the present invention, such a collision load can be effectively absorbed.

  According to this invention of Claim 5, since the back extension part extended from the lower end part of the energy absorption member to the vehicle rear side and arrange | positioned at the lower surface side of the front bumper reinforcement is connected with the lower surface of the front bumper reinforcement. When a frontal collision with a pedestrian occurs, a shearing force is generated at the connection site. For this reason, the said boss | hub part can receive the load input into the back extension part of the energy absorption member from a pedestrian's leg part (it can utilize for a deformation | transformation of a back extension part).

  As described above, in the front bumper structure according to the first aspect of the present invention, the center position of the vehicle vertical stress distribution generated in the energy absorbing member at the time of a frontal collision is assumed that the energy of the front bumper reinforcement depends on the height. The shape and arrangement of the energy absorbing member are set so that when the height of the absorbing member is adjusted and the vehicle is fully wrapped in the vertical direction of the vehicle, the energy absorbing member falls below the center position of the stress distribution generated in the energy absorbing member. Therefore, it has the outstanding effect that the protection performance of the leg part of a pedestrian at the time of front collision with a pedestrian can be improved, without causing disadvantages, such as an increase in a vehicle body weight.

  The front bumper structure according to the second aspect of the present invention is the front bumper structure according to the first aspect of the present invention, wherein at least the lower end portion of the energy absorbing member is extended to the vehicle lower side from the lower surface of the front bumper reinforcement. The center position of the stress distribution in the vehicle vertical direction generated in the absorbing member can be lowered to the vehicle lower side, and as a result, the protection performance of the leg part of the pedestrian can be further enhanced than the invention of claim 1. It has the effect.

  The front bumper structure according to the third aspect of the present invention is the front bumper structure according to the second aspect of the present invention, wherein the upper end portion of the energy absorbing member is set at a position lower than the upper surface of the front bumper reinforcement, and the lower end portion is the front bumper reinforcement. Therefore, the center position of the stress distribution in the vehicle vertical direction generated in the energy absorbing member can be lowered further than in the invention according to claim 2, and the energy absorbing member is utilized by utilizing the shearing force. The reaction force that is locally input from the energy absorbing member to the pedestrian's knee can be reduced. As a result, according to this invention, it has the outstanding effect that the protection performance of a pedestrian's leg part can be improved further.

  The front bumper structure according to a fourth aspect of the present invention is the front bumper structure according to the second or third aspect, wherein the lower end of the energy absorbing member is set at a position lower than the lower surface of the front bumper reinforcement, and the lower end Is extended to the lower surface side of the front bumper reinforcement, so that the energy absorbing performance on the lower end side of the energy absorbing member can be enhanced.

  A front bumper structure according to a fifth aspect of the present invention is the front bumper structure according to the fourth aspect of the present invention, wherein the rear extension portion extended from the lower end portion of the energy absorbing member to the vehicle rear side and disposed on the lower surface side of the front bumper reinforcement is provided. Since it is connected to the lower surface of the front bumper reinforcement, an energy absorption effect using the shearing force generated at the connection part at the time of frontal collision with a pedestrian is added, and as a result, energy absorption performance on the lower end side of the energy absorbing member It has the outstanding effect that it can raise further.

[First Embodiment]
Hereinafter, a first embodiment of a front bumper structure according to the present invention will be described with reference to FIGS. In these drawings, an arrow FR appropriately shown indicates the vehicle front side, and an arrow UP indicates the vehicle upper side.

  FIG. 3 is a side view showing the appearance of the front end portion of the vehicle to which the front bumper structure according to this embodiment is applied. FIG. 1 shows the entire structure including the main part of the front bumper structure in a longitudinal sectional view.

  As shown in these drawings, a front bumper 10 is disposed at the front end of the vehicle. A radiator grill 12 is disposed on the upper side of the front bumper 10 and a hood 14 is disposed on the upper side.

  The front bumper 10 is disposed in a belt shape along the vehicle width direction as a whole, and a front bumper cover 16, an energy absorbing member 18, and a front bumper reinforcement 20 are arranged in this order from the front side.

  The front bumper cover 16 has a three-dimensional shape in which both end portions in the longitudinal direction (vehicle width direction) are gently bent toward the vehicle rear side, constitutes a design surface, and is disposed at the front end portion of the vehicle. Yes.

  A long front bumper reinforcement 20 is disposed on the vehicle rear side of the front bumper cover 16 so as to follow the planar shape of the front bumper cover 16. The front bumper reinforcement 20 is formed as a high-strength member having a vertical cross-sectional shape of “day”. In addition, the front end portions of the pair of left and right front side members 22 arranged with the longitudinal direction of the vehicle in the longitudinal direction on both sides of the front portion of the vehicle body are directly or directly at the both end portions of the front bumper reinforcement 20 in the longitudinal direction. Are connected through. Therefore, the load at the time of frontal collision input to the front bumper reinforcement 20 is transmitted (flows) to the left and right front side members 22.

  Between the front bumper cover 16 and the front bumper reinforcement 20 is interposed an energy absorbing member 18 which is formed in a long shape in the vehicle width direction and has a solid rectangular cross-sectional shape. The energy absorbing member 18 is made of a foam material made of an elastic material, and has the same height as the front bumper reinforcement 20. The energy absorbing member 18 is disposed in contact with the front surface of the front bumper reinforcement 20.

  Here, as shown in FIGS. 1 and 2B, the energy absorbing member 18 described above is disposed at a position offset by a predetermined distance from the upper surface 20A of the front bumper reinforcement 20 to the vehicle lower side. More precisely, the upper end portion 18A of the energy absorbing member 18 is disposed at a position lower than the upper surface 20A of the front bumper reinforcement 20 by a predetermined distance, and the lower end portion 18B of the energy absorbing member 18 is the lower surface of the front bumper reinforcement 20. It is arranged at a position lower than 20B. In other words, the lower end portion 18B of the energy absorbing member 18 extends from the lower surface 20B of the front bumper reinforcement 20 to the vehicle lower side.

(Operation and effect of this embodiment)
Next, the operation and effect of this embodiment will be described.

  The state shown in FIG. 1 is a state immediately after the frontal collision of the vehicle with the impactor (impactor) 24 seen on the pedestrian's leg. 1 includes an upper part 24A corresponding to the thigh and a lower part 24B corresponding to the shin part, and both of them can be rotated around a bent part 24C corresponding to the knee. . Further, the X-ray added in FIG. 1 represents the position (height) of the knee of the occupant's leg.

  If the energy absorbing member 26 shown in FIG. 2A is used instead of the energy absorbing member 18 of the present embodiment shown in FIG. 1, that is, the energy absorbing member 26 is at the height of the front bumper reinforcement 20. When the front bumper reinforcement 20 and the energy absorbing member 26 are fully wrapped in the vertical direction of the vehicle when the height of the vehicle is matched, the case where the vehicle collides frontally with the collision body 24 is shown in FIG. Thus, since the center position P of the stress distribution generated in the energy absorbing member 26 is at a position that is ½ of the height of the energy absorbing member 26, it is compared with the bent portion 24C of the collision body 24 as can be seen from FIG. The collision reaction force acts at a position close to the target.

  On the other hand, in the front bumper structure according to the present embodiment, the energy absorbing member 18 having the same shape is arranged offset to the vehicle lower side with respect to the front bumper reinforcement 20, so that as shown in FIG. The center position Q of the stress distribution in the vehicle vertical direction generated in the energy absorbing member 18 at the time of a frontal collision exists at a position that is ½ of the height of the energy absorbing member 18, and as a result, the energy absorbing member for comparison described above. The vehicle is lowered to the vehicle lower side by a height δ from the center position P of the 26 stress distribution. That is, when viewed with the collision body 24 as a reference, the center position Q of the stress distribution of the energy absorbing member 18 is located at a position away from the bent portion 24C corresponding to the knee. For this reason, the lower portion 24B of the collision body 24 is easily rotated in the direction of arrow A in FIG. 1 around the bent portion 24C. Replacing this with the pedestrian's leg improves the foot-wiping property (the effect of touching the pedestrian's leg) that rotates the pedestrian's leg in the direction of arrow A in FIG. Therefore, the burden on the knee of the leg of the pedestrian is reduced. That is, the protection performance of the leg part of a pedestrian is improved.

  Moreover, in the front bumper structure according to the present embodiment, the center position Q of the stress distribution in the vehicle vertical direction generated in the energy absorbing member 18 due to the shape and arrangement of the energy absorbing member 18 is moved away (separated) from the bent portion 24C. Therefore, there is no need for a separate part such as a mounting bracket as in the prior art.

  As mentioned above, according to the front bumper structure concerning this embodiment, the protection performance of the pedestrian's leg part at the time of front collision with a pedestrian can be improved, without causing disadvantages, such as an increase in body weight.

  In the front bumper structure according to the present embodiment, the upper end portion 18A of the energy absorbing member 18 is set at a position lower than the upper surface 20A of the front bumper reinforcement 20 and the lower end portion 18B is formed from the lower surface 20B of the front bumper reinforcement 20. Therefore, for example, a front bumper structure in which the upper end is flush with the upper surface 20A of the front bumper reinforcement 20 and only the lower end is set lower than the lower surface 20B of the front bumper reinforcement 20 (described later). Compared to the embodiment shown in FIG. 7, the center position Q of the vehicle vertical stress distribution generated in the energy absorbing member 18 can be further lowered to the vehicle lower side (Operation 1).

  Furthermore, since the lower end portion 18B of the energy absorbing member 18 is not supported by the front bumper reinforcement 20, when a collision load to the rear side of the vehicle is input to the energy absorbing member 18, the front bumper reinforcement 20 at the lower end portion 18B is A shearing force S is generated at the position of the lower surface 20B. That is, as shown in FIG. 4A, in the state immediately after the frontal collision with the collision body 24, the collision load from the collision body 24 to the energy absorbing member 18 is input to the rear side of the vehicle with a uniform distribution in the vehicle vertical direction. Thus, the energy absorbing member 18 performs predetermined elastic deformation (compression deformation) and absorbs energy at the time of collision. Subsequently, as shown in FIG. 4B, when the relative stroke of the collision body 24 toward the rear side of the vehicle further proceeds, the energy absorbing member 18 is thickened by the collision body 24 and the front surface 20C of the front bumper reinforcement 20. Further compression is performed in the vertical direction (vehicle longitudinal direction). For this reason, a shearing force S toward the vehicle front side is generated at the base of the lower end portion 18B of the energy absorbing member 18 (that is, the portion intersecting the lower surface 20B of the front bumper reinforcement 20). Then, as shown in FIGS. 4B and 4C, the energy absorbing member 18 is pulled and deformed by the shearing force S to the front side of the vehicle, and new energy absorption by the shearing force S is applied to the energy absorbing member 18. An effect occurs (operation 2).

  Moreover, the fact that the upper end portion 18A of the energy absorbing member 18 exists at a position lower than the upper surface 20A of the front bumper reinforcement 20 means that the energy absorbing member 18 does not exist on the front surface 20C side of the upper end portion of the front bumper reinforcement 20. become. Here, when the lower portion 24B of the collision body 24 is paid during the frontal collision with the collision body 24, the bending portion 24C of the collision body 24 absorbs energy as a result of the rotational movement of the lower portion 24B of the collision body 24 around the bending portion 24C. The member 18 swings down toward the upper end 18A side (in the direction of arrow B in FIG. 1). However, in the case of the front bumper structure according to the present embodiment, since the upper end portion 18A of the energy absorbing member 18 does not exist in that portion, the local reaction force input from the energy absorbing member 18 to the bent portion 24C of the collision body 24. Can be reduced (Operation 3).

  As a result of the above three actions, according to the front bumper structure according to the present embodiment, the protection performance of the pedestrian's legs during a frontal collision can be further enhanced.

  In addition, when the energy absorption amount of the energy absorption member 18 is reduced as compared to the case of the full wrap arrangement due to the offset arrangement of the energy absorption member 18, the reduction amount is increased by increasing the firing magnification of the energy absorption member 18. It is possible to secure the same amount of energy absorption as in the case of the full wrap arrangement.

[Second Embodiment]
Next, a second embodiment of the front bumper structure according to the present invention will be described with reference to FIGS. 5 and 6. Note that the same components as those in the first embodiment described above are denoted by the same reference numerals and description thereof is omitted.

  The embodiment shown in FIG. 5 is characterized in that the longitudinal cross-sectional shape of the energy absorbing member 30 is formed in an L shape in order to improve the energy absorbing member 18 according to the first embodiment.

  That is, the upper end portion 30A of the energy absorbing member 30 is set at a position lower than the upper surface 20A of the front bumper reinforcement 20, and the lower end portion 30B of the energy absorbing member 30 is positioned lower than the lower surface 20B of the front bumper reinforcement 20. Is set. Further, the lower end portion 30B of the energy absorbing member 30 extends to the vehicle rear side, and is disposed in contact with the lower surface 20B of the front bumper reinforcement 20. Hereinafter, the portion extended to the vehicle rear side is referred to as “rear extension portion 30C”. The extension length of the rear extension 30 </ b> C to the vehicle rear side is set to the middle part (near the middle point) in the front-rear direction of the lower surface 20 </ b> B of the front bumper reinforcement 20.

  Also with the above configuration, since the configuration of the front bumper structure according to the first embodiment is followed as it is, the functions and effects of the front bumper structure according to the first embodiment can be obtained in the same manner.

  In addition, in the case of this embodiment, the lower end portion 30B of the energy absorbing member 30 is set to a position lower than the lower surface 20B of the front bumper reinforcement 20, and the lower end portion 30B is extended to the lower surface 20B side of the front bumper reinforcement 20. Therefore, the energy absorption effect by deform | transforming the said extended part (backward extension part 30C) at the time of front collision is also acquired. In particular, as shown in FIG. 5, when the lower end portion of the lower portion 24B of the collision body 24 corresponding to the saddle is tilted toward the vehicle at the time of a frontal collision with the collision body 24, the lower portion 24B of the collision body 24 More collision load is input to the lower end portion 30B of the energy absorbing member 30. In the front bumper structure according to the present embodiment, not only the lower end 30B but also the rear extension 30C can be elastically deformed, so that the collision load can be effectively absorbed. As a result, according to the present embodiment, the energy absorbing performance on the lower end portion 30B side of the energy absorbing member 30 can be enhanced.

  In the embodiment shown in FIG. 6, a truncated cone-shaped boss 40 is set on the upper surface of the rear extension 30 </ b> C of the L-shaped cross-section energy absorbing member 30 shown in FIG. 5, and this boss 40 is used as a front bumper reinforcement. It is characterized in that it is fitted into a through hole 42 provided in the bottom wall portion of 20.

  That is, a through hole 42 having a predetermined diameter passing through the bottom wall portion is formed in the vicinity of the middle portion in the front-rear direction of the bottom wall portion of the front bumper reinforcement 20. On the other hand, the rear extension 30 </ b> C of the energy absorbing member 30 is integrally formed with a truncated cone-shaped boss 40 whose outer diameter is set to be the same as or slightly smaller than the inner diameter of the through hole 42. Is formed. When the energy absorbing member 30 is assembled to the front bumper reinforcement 20, the boss portion 40 is fitted into the through hole 42 from below (connected state).

  The boss 40 and the through hole 42 are broadly defined as “a connection that connects a rear extension provided at the lower end of the energy absorbing member and extending toward the vehicle rear side to the front bumper reinforcement (the lower end thereof). It is an element grasped as “part”.

  Also with the above configuration, since the configuration of the front bumper structure according to the first embodiment is followed as it is, the functions and effects of the front bumper structure according to the first embodiment can be obtained in the same manner. Moreover, the effect | action and effect with which the energy absorption member 30 shown by FIG. 5 is provided are obtained similarly.

  In addition, in the case of this embodiment, a rear extension 30 </ b> C that extends from the lower end 30 </ b> B of the energy absorbing member 30 to the vehicle rear side and is disposed on the lower surface 20 </ b> B side of the front bumper reinforcement 20 is provided on the lower surface 20 </ b> B of the front bumper reinforcement 20. Since the boss portion 40 and the through hole 42 are connected in the vehicle front-rear direction, a shear force S ′ is generated in the boss portion 40 that is the connection portion at the time of a frontal collision with the collision body 24. For this reason, the boss portion 40 can receive a load on the vehicle rear side input from the collision body 24 to the rear extension 30C of the energy absorbing member 30 (utilize the deformation of the rear extension 30C). As a result, according to the present embodiment, the energy absorbing performance on the lower end portion 30B side of the energy absorbing member 30 can be further enhanced.

[Supplementary explanation of this embodiment]
In the first and second embodiments described above, the upper end portions 18A and 30A of the energy absorbing members 18 and 30 are set at a position lower than the upper surface 20A of the front bumper reinforcement 20, but the first and second embodiments are described. As shown in FIG. 7, the invention includes the case where the upper end portion 50 </ b> A of the energy absorbing member 50 is set to the same height as the upper surface 20 </ b> A of the front bumper reinforcement 20. Also in this case, since the lower end 50B is set at a position lower than the lower surface 20B of the front bumper reinforcement 20, the center position of the stress distribution is the stress distribution of the energy absorbing member 26 shown in FIG. It becomes lower than the center position.

  Moreover, in 1st, 2nd embodiment mentioned above, although the cross-sectional shape of the energy absorption members 18, 30, and 50 was made into the rectangle or L shape, you may employ | adopt not only this but another shape.

It is a longitudinal cross-sectional view which shows the whole structure containing the principal part of the front bumper structure which concerns on 1st Embodiment. (A) is a longitudinal sectional view when a full wrap arrangement is adopted, and (B) is a longitudinal sectional view when an offset arrangement is adopted. It is a side view which shows the external appearance of the front-end part of the vehicle to which the front bumper structure shown by FIG. 1 was applied. It is explanatory drawing for demonstrating an effect | action at the time of front collision with a pedestrian. It is a longitudinal cross-sectional view corresponding to FIG.2 (B) which shows the principal part of the front bumper structure which concerns on 2nd Embodiment. It is a longitudinal cross-sectional view which shows the modification of the energy absorption member shown by FIG. It is a longitudinal cross-sectional view corresponding to FIG.2 (B) which shows the modification which aligned the upper end part with the upper surface of the front bumper reinforcement.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Front bumper 16 Front bumper cover 18 Energy absorption member 18A Upper end part 18B Lower end part 20 Front bumper reinforcement 20A Upper surface 20B Lower surface 24 Colliding body 24A Upper part 24B Lower part 24C Bending part 26 Energy absorption member 30 Energy absorption member 30A Upper end part 30B Lower end part 30C Rear extension 40 Boss 42 Through hole 50 Energy absorbing member 50B Lower end

Claims (5)

A front bumper cover disposed along the vehicle width direction at the front end of the vehicle, and a front bumper reinforcement spaced apart on the vehicle rear side of the front bumper cover and formed in a long shape along the vehicle width direction And a long shape that is interposed between the front bumper cover and the front bumper reinforcement and is arranged along the front bumper reinforcement to absorb energy by deforming when a load greater than a predetermined value acts on the vehicle rear side. A front bumper structure configured to include an energy absorbing member of
When the center position of the stress distribution in the vehicle vertical direction generated in the energy absorbing member at the time of a frontal collision is matched with the height of the energy absorbing member to the height of the front bumper reinforcement and fully wrapped in the vertical direction of the vehicle, The shape and arrangement of the energy absorbing member were set so as to fall to the vehicle lower side than the center position of the stress distribution generated in the energy absorbing member
Front bumper structure characterized by that. The energy absorbing member has at least a lower end extended to the vehicle lower side than the lower surface of the front bumper reinforcement,
The front bumper structure according to claim 1. The energy absorbing member has an upper end set at a position lower than the upper surface of the front bumper reinforcement, and a lower end is set at a position lower than the lower surface of the front bumper reinforcement.
The front bumper structure according to claim 2. The energy absorbing member has a lower end set at a position lower than the lower surface of the front bumper reinforcement, and the lower end extends to the lower surface side of the front bumper reinforcement.
The front bumper structure according to claim 2 or 3, wherein the front bumper structure is provided. A rear extension that is extended from the lower end of the energy absorbing member to the vehicle rear side and disposed on the lower surface side of the front bumper reinforcement is connected to the lower surface of the front bumper reinforcement.
The front bumper structure according to claim 4.

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