JP2016022940A - Bumper for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve accuracy of discrimination whether or not a collision body with a front bumper is a pedestrian.SOLUTION: In an absorber 30 mounted to a front bumper 12 provided with a pedestrian collision detection device 10, a front end 34A of a spacer portion 34 is positioned closer to a rear side of a vehicle than a front end 32A of a main body portion 32, and an opening portion 28 is provided on a connection portion 36 connecting the spacer portion 34 and the main body portion 32. On this account, when the front bumper 12 collides with a pedestrian, the connection portion 36 is easily deformed. Accordingly, the spacer portion 34 is displaced to the rear side of the vehicle, and deformation of a chamber member 20 can be increased. Therefore, a difference between output values of a pressure detector 24 when the front bumper 12 collides with the pedestrian and when the front bumper 12 collides with an object body other than the pedestrian can be increased. Consequently, accuracy of discrimination whether or not a collision body with the front bumper 12 is the pedestrian can be improved.SELECTED DRAWING: Figure 1

Description

    The present invention relates to a vehicle bumper equipped with a pedestrian collision detection device.

  The vehicle bumper described in Patent Document 1 below discloses a configuration in which an absorber is disposed between a bumper cover and a chamber member. This absorber is comprised by the absorber main-body part which comprises a lower part, and the spacer part integrally shape | molded via the connection part above this absorber main-body part.

  Here, by disposing the front end of the spacer portion on the vehicle rear side from the front end of the absorber main body portion, the amount of deformation of the chamber member when a collision body other than a pedestrian collides with the bumper can be reduced. That is, by increasing the difference between the amount of deformation of the chamber when the pedestrian and the bumper collide, the accuracy of determining whether or not the colliding body is a pedestrian is increased. In addition, as a vehicle bumper structure provided with the collision detection device, there are those described in Patent Documents 2 to 4 below.

JP 2014-084068 A JP 2010-179668 A JP 2011-143825 A JP 2014-104805 A

  However, since the vehicle body bumpers of Patent Documents 1 to 4 are all connected to the absorber main body portion and the spacer portion at the connecting portion in the vehicle width direction, the load when the pedestrian and the bumper collide is the spacer. It is also transmitted to the main body part of the absorber through the part. That is, a part of the load applied from the pedestrian is not transmitted to the chamber member. Therefore, there is room for further improvement in order to improve the collision object discrimination accuracy by efficiently transmitting the load applied by the pedestrian to the chamber member and deforming the chamber member.

  An object of the present invention is to provide a vehicular bumper that can improve the accuracy of determining whether or not a collision object is a pedestrian in consideration of the above facts.

  The bumper for a vehicle according to claim 1 is disposed on a front side of the bumper reinforcement extending in the vehicle width direction and on the vehicle front side of the bumper reinforcement, and is disposed along the bumper reinforcement with the vehicle width direction as a longitudinal direction. A hollow sensor member, a pressure detector connected to the hollow sensor member and outputting a signal corresponding to a pressure change of the hollow sensor member, and a walking based on a signal connected to the pressure detector and output from the pressure detector A bumper cover that extends in the vehicle width direction on the vehicle front side of the bumper reinforcement, is interposed between the bumper reinforcement and the bumper cover, and is hollow. Provided with an absorber having a main body arranged with the vehicle width direction as a longitudinal direction on the vehicle lower side of the sensor member, A spacer portion that is integrally formed and interposed between the hollow sensor member and the bumper cover on the vehicle upper side of the main body portion, and that has a front end disposed on the vehicle rear side from the front end of the main body portion, and the main body portion and the spacer portion. In addition to connecting in the vertical direction of the vehicle, it has a connecting portion provided with an opening that penetrates or is aligned in the thickness direction of the absorber.

  2. The vehicle bumper according to claim 1, wherein the absorber is disposed between the bumper cover and the bumper reinforcement on the vehicle lower side of the hollow sensor member, and the spacer is disposed between the bumper cover and the hollow sensor member. The parts are connected to each other by a connecting part, and the connecting part is provided with an opening.

  Here, when the pedestrian (the leg portion) collides with the front bumper, the pedestrian falls to the rear side of the vehicle, and therefore, a load is applied to the front portion of the vehicle from the pedestrian toward the lower rear side of the vehicle. And a hollow sensor member deform | transforms by pressing the spacer part of an absorber via a bumper cover, and the signal according to the pressure change of a hollow sensor member is output to a collision determination part.

  On the other hand, when a front bumper collides with an object other than a pedestrian (for example, a roadside marker or a road obstacle such as a post cone), the bumper cover is deformed to the rear side of the vehicle and transmits a load to the absorber. Here, since the front end of the main body portion is located in front of the vehicle compared to the front end of the spacer portion, the collision body hits the main body portion before the spacer portion, and the main body portion is compressed and deformed in the vehicle longitudinal direction. Transmit load to reinforcement.

  Thereafter, when the main body is further compressed, the load from the object also acts on the spacer, and compresses and deforms the hollow sensor member via the spacer. And the signal according to the pressure change of a hollow sensor member is output to a collision determination part from a pressure detector.

  As described above, when the object other than the pedestrian collides with the front bumper, the initial load is absorbed by the main body of the absorber, so the deformation amount of the hollow sensor member is smaller than when the pedestrian collides, The detected pressure value is also reduced. It is determined whether or not the collision object to the bumper is a pedestrian based on such a difference in pressure value.

  Here, when the opening is provided in the connection portion, the load transmitted to the main body portion when the vehicle collides with the pedestrian is reduced. That is, the load from the pedestrian can be efficiently transmitted to the spacer portion of the absorber. For this reason, it is easy to displace the spacer part toward the vehicle rear side, and the deformation amount of the hollow sensor member can be increased (the detected pressure value can be increased). Therefore, the difference in pressure value between the case where the vehicle collides with a pedestrian and the case where the vehicle collides with an object other than the pedestrian can be increased, and the determination accuracy of whether or not the colliding body is a pedestrian can be improved. it can.

  A vehicle bumper according to a second aspect is the invention according to the first aspect, wherein at least a part of the opening is provided at a position including a boundary between the main body and the connection.

  When the pedestrian and the front bumper collide, a load is applied to the spacer portion from the pedestrian toward the lower rear side of the vehicle. Here, a bending moment is applied to the connection part away from the point where the load acts, and a higher bending moment acts on the boundary between the body part and the connection part (the lower end part of the connection part) farthest away. By disposing the opening at this position, the spacer portion can be displaced rearward more efficiently and the amount of deformation of the hollow sensor member can be increased, so that the collision object discrimination accuracy can be improved.

  According to a third aspect of the present invention, in the vehicle bumper according to the first or second aspect, the opening includes a plurality of opening holes arranged side by side in the vehicle width direction.

  By configuring the opening with a plurality of opening holes provided side by side in the vehicle width direction, the rigidity of the connecting portion can be changed to adjust the amount of displacement of the spacer portion toward the rear of the vehicle.

  According to a fourth aspect of the present invention, in the vehicle bumper according to any one of the first to third aspects, a license plate is attached to the front surface of the bumper cover, and at least a part of the opening is at the front of the vehicle. It is arranged in an area that overlaps the license plate visually.

  The area where the license plate of the bumper cover is attached has higher strength than other areas, and even when a pedestrian collides with the area, the bumper cover is less likely to be displaced than other areas. The transmitted load is reduced. By arranging the opening in this region, the spacer can be efficiently displaced toward the vehicle rear side even when the load applied to the spacer is relatively small.

  According to a fifth aspect of the present invention, in the vehicle bumper according to the fourth aspect, at least a part of the opening extends outward in the vehicle width direction from a region overlapping the license plate in a front view of the vehicle.

  In the vehicle bumper according to claim 5, the opening is disposed so as to straddle the license plate having a higher strength than other regions in the vehicle width direction, so that the spacer can be used even when the license plate is displaced rearward. The load can be efficiently transmitted to the part to displace the spacer part toward the vehicle rear side.

  The bumper for a vehicle according to claim 6 is arranged on the front side of the bumper reinforcement extending in the vehicle width direction and on the vehicle front side of the bumper reinforcement, and is arranged with the vehicle width direction as a longitudinal direction along the bumper reinforcement. A hollow sensor member, a pressure detector connected to the hollow sensor member and outputting a signal corresponding to a pressure change of the hollow sensor member, and a signal connected to the pressure detector and output from the pressure detector A collision determination unit that determines whether or not the vehicle has collided with a pedestrian, a bumper cover that extends in the vehicle width direction on the vehicle front side of the bumper reinforcement, and is interposed between the bumper reinforcement and the bumper cover, The absorber member arranged with the vehicle width direction as the longitudinal direction on the vehicle lower side of the hollow sensor member is configured separately from the absorber member. In addition, the vehicle is mounted on the vehicle body or the bumper cover via the mounting portion, and is disposed between the front end of the hollow sensor member and the rear surface of the bumper cover, and the front end is located on the vehicle rear side from the front end of the absorber member. And a spacer member extending in the width direction.

  In the vehicle bumper according to claim 6, a spacer member separate from the absorber member is attached to a position separated from the absorber above the absorber member disposed between the bumper cover and the bumper reinforcement. Yes. Here, in the case of collision with a pedestrian, the spacer member can be displaced rearward without being affected by the absorber member, so that the hollow sensor member can be efficiently deformed.

  As described above, the vehicular bumper according to the first aspect has an excellent effect that it is possible to accurately determine whether or not the colliding object is a pedestrian.

  The bumper for a vehicle according to claim 2 has an excellent effect of improving the discrimination accuracy when a pedestrian collides.

  The vehicle bumper according to claim 3 has an excellent effect that the displacement amount of the spacer portion can be easily adjusted by changing the rigidity of the connection portion by the opening portion, and the discrimination accuracy can be improved. Have.

  The vehicle bumper according to claim 4 has an excellent effect that the discrimination accuracy can be improved even when the pedestrian collides with the position where the license plate is attached.

  The vehicular bumper according to claim 5 has an excellent effect that the discrimination accuracy when the vehicle collides with the pedestrian at the position where the license plate is attached can be further improved.

  The vehicle bumper according to claim 6 has an excellent effect that it is possible to accurately determine whether or not the collision object is a pedestrian.

It is the sectional side view which looked at the vehicle front part provided with the bumper for vehicles which concerns on 1st Embodiment from the vehicle side. (A) is the perspective view which looked at the vehicle center part of the absorber shown by FIG. 1 from the vehicle rear side, (B) is a rear view of the opening part shown by (A). It is a sectional side view corresponding to Drawing 1 showing a state at the time of vehicles and objects other than a pedestrian colliding concerning a 1st embodiment. It is a sectional side view corresponding to Drawing 1 showing the state at the time of vehicles and a pedestrian colliding concerning a 1st embodiment. It is a perspective view corresponding to Drawing 2 (A) concerning a 2nd embodiment which looked at a vehicle central part of an absorber from vehicles back. It is a sectional side view corresponding to Drawing 4 showing the state at the time of vehicles and a pedestrian colliding concerning a 2nd embodiment.

(First embodiment)
Hereinafter, the vehicle bumper including the pedestrian collision detection apparatus 10 according to the first embodiment will be described with reference to FIGS. In each figure, an arrow FR appropriately shown indicates the vehicle front side, and an arrow UP indicates the vehicle upper side.

  As shown in FIG. 1, a pedestrian collision detection device 10 is applied to a front bumper 12 as a vehicle bumper disposed at the front end of a vehicle. It is determined whether or not. Here, when it is determined that the pedestrian collides, for example, a pedestrian protection device such as a hood airbag or a pop-up hood can be activated. This will be specifically described below.

  The front bumper 12 includes a bumper reinforcement (hereinafter referred to as “bumper RF”) 14 which is a bumper skeleton member. The bumper RF14 has a front wall 14A that constitutes the front surface of the vehicle and a rear wall 14B that constitutes the rear surface of the vehicle. The front wall 14A and the rear wall 14B are connected in the vehicle front-rear direction by an upper wall 14C and a lower wall 14D, respectively, on the vehicle vertical direction end portion side. A plurality of reinforcing portions 14E are arranged in parallel between the upper wall 14C and the lower wall 14D, and similarly connect the front wall 14A and the rear wall 14B in the vehicle longitudinal direction.

  The bumper RF14 extends in the vehicle width direction, and the rear wall 14B is connected to a front end of a pair of left and right front side members (not shown) or a crash box (not shown) attached to the front ends of the front side members. Is supported against. The bumper RF 14 is made of a metal material such as iron or aluminum.

  The front bumper 12 includes a bumper cover 16 that forms the front surface of the vehicle. The bumper cover 16 covers the bumper RF14 from the front side of the vehicle, and is fixed to the vehicle body by fixing means (not shown). Further, a bumper grill 18 that constitutes a part of the bumper cover 16 is provided at the center of the bumper cover 16 in the vehicle width direction, and a license plate 40 is attached to the lower side of the bumper grill 18 in the vehicle. The bumper cover 16 is formed of, for example, resin.

  Between the bumper RF14 and the bumper cover 16, an absorber 30 extending in the vehicle width direction is interposed as will be described later. The bumper cover 16 is curved toward the vehicle rear side from the center in the vehicle width direction toward the outside in the vehicle width direction as viewed from above the vehicle. By changing the thickness of the absorber 30 in the vehicle width direction corresponding to the shape of the bumper cover 16, the distance in the vehicle front-rear direction between the bumper cover 16 and the absorber 30 is made substantially constant. The absorber 30 may be curved toward the vehicle rear side along the bumper cover 16 toward the outside in the vehicle width direction so that the distance in the vehicle front-rear direction between the bumper cover 16 and the absorber 30 is substantially constant. .

  Between the bumper RF14 and the bumper cover 16, a chamber member 20 as a hollow sensor member is disposed along the front wall 14A of the bumper RF14 in the longitudinal direction. Note that the positions at both ends in the longitudinal direction of the chamber member 20 substantially coincide with the positions at both ends of the bumper RF14. The pressure chamber 22 has a communication hole that communicates with the atmosphere at a position not shown. That is, in the normal state (before the collision), the pressure chamber 22 in the internal space of the chamber member 20 is at atmospheric pressure.

  When the collision body and the front bumper 12 collide from the front of the vehicle, the chamber member 20 is compressed, so that the volume of the pressure chamber 22 is reduced while allowing air to escape from the communication hole. At this time, the pressure in the pressure chamber 22 changes dynamically.

  A pressure change in the pressure chamber 22 caused by the collision is detected by a pressure sensor 24 as a pressure detector connected to the pressure chamber 22. Furthermore, the pressure sensor 24 outputs a signal corresponding to the detected internal pressure to the ECU 26 corresponding to the collision determination unit. In this ECU 26, the collision load is calculated based on the signal.

  In addition, a signal corresponding to the collision speed is input to the ECU 26 from a speed sensor (not shown), and the collision speed is also calculated. And while calculating | requiring the effective mass of a collision body from the calculated collision load and collision speed, it is judged whether an effective mass exceeds a threshold value, and it is judged whether a collision body is a pedestrian. ing.

  Between the bumper RF14 and the bumper cover 16, an absorber 30 is disposed with the vehicle width direction as a longitudinal direction. The absorber 30 includes a main body portion 32 constituting a lower portion of the absorber 30, a spacer portion 34 constituting an upper portion, and a connection portion extending in the vehicle width direction by connecting the main body portion 32 and the spacer portion 34 in the vehicle vertical direction. 36 is integrally formed with foamed resin, and is fixed to the vehicle body at one end in the vehicle width direction (not shown) as an example.

  The main body 32 constituting the lower part of the absorber 30 is provided between the bumper cover 16 and the bumper RF14 on the vehicle lower side of the chamber member 20, and is disposed adjacent to the rear surface of the bumper cover 16 and the front wall 14A of the bumper RF14. Has been. Further, at the height of the bumper cover 16 that coincides with the main body portion 32 in the vehicle vertical direction, a part of the bumper cover 16 (may be provided separately) protrudes toward the vehicle rear side, and the front surface of the main body portion 32. And an adjacent protrusion 42 is provided. Further, the bumper cover 16 protrudes forward of the vehicle on the vehicle upper side of the protruding portion 42, and a gap G <b> 1 is provided between the absorber 30 and the bumper cover 16.

  The spacer portion 34 constituting the upper portion of the absorber 30 is provided between the bumper cover 16 and the chamber member 20 on the vehicle upper side of the main body portion 32, and between the rear surface of the bumper cover 16 and the front surface of the chamber member 20. Intervened. In addition, on the rear surface of the bumper cover 16, a block-shaped protruding member 44 (which may be formed integrally with the bumper cover 16) is disposed obliquely above the vehicle front side of the spacer portion 34.

  A plurality of ribs 46 are provided on the rear surface 34 </ b> B of the spacer portion 34 in the vehicle width direction, and the vehicle rear side surface of the ribs 46 is disposed adjacent to the front surface 20 </ b> A of the chamber member 20. Furthermore, from the upper end of the spacer part 34, the extension part 48 extended from the front surface 20A of the chamber member 20 to the vehicle rear side is provided.

  Furthermore, the spacer part 34 is arrange | positioned between the front end 32A and the rear end 32B of the main-body part 32 in the vehicle front-back direction. In other words, the front end 34 </ b> A of the spacer portion 34 is positioned behind the vehicle from the front end 32 </ b> A of the main body portion 32 and ahead of the vehicle from the rear end 32 </ b> B of the main body portion 32.

  The vehicle upper side portion of the main body portion 32 and the vehicle lower side portion of the spacer portion 34 are connected in the vehicle vertical direction by a connection portion 36, and the connection portion 36 extends in the vehicle width direction as shown in FIG. Yes.

  Further, as shown in FIG. 2B, a plurality of opening holes 38 penetrating in the thickness direction of the absorber 30 are provided in the vehicle width direction at positions overlapping the license plate 40 in the connection portion 36 when the vehicle is viewed from the front. In the present embodiment, three openings are formed to be arranged. Furthermore, each opening hole 38 is formed in the connection part 36 so that the boundary (the lower end part of a connection part) of the main-body part 32 and the connection part 36 may be included.

  The opening hole 38 has a substantially rectangular shape with the vehicle width direction as a longitudinal direction, and is arranged in the vehicle width direction symmetrically with respect to the center of the vehicle. In the present embodiment, the openings 28 (all of the opening holes 38) are all disposed in the region where the license plate 40 is attached as viewed from the front of the vehicle.

  Next, the operation and effect of the first embodiment will be described.

(When an object other than a pedestrian collides with the front bumper 12)
The case where the front bumper 12 including the pedestrian collision detection device 10 configured as described above and an object other than a pedestrian (for example, a roadside marker, a road obstacle such as a post cone) collide with each other will be described with reference to FIG. explain.

  When an object other than a pedestrian collides with the front bumper 12, a load on the rear side of the vehicle (indicated by an arrow F <b> 1 in FIG. 3) is applied to the bumper cover 16, so that the bumper cover 16 is deformed to the absorber 30. Transmit load. Here, since the front end 32A of the main body portion 32 is disposed in front of the vehicle from the front end 34A of the spacer portion 34, the main body portion 32 is ahead of the spacer portion 34 with respect to a load applied substantially horizontally in the vehicle longitudinal direction. The impact load is received, and the load is transmitted to the bumper RF14 while being compressed and deformed.

  Further, since the bumper cover 16 is provided with a protruding portion 42 protruding toward the vehicle rear side, the load applied from the object to the bumper cover 16 is efficiently transmitted to the main body portion 32 positioned on the vehicle rear side. be able to. That is, it is difficult for the load to be transmitted to the spacer portion 34, and the deformation of the chamber member 20 is suppressed.

(When pedestrian and front bumper 12 collide)
Next, the case where the pedestrian and the front bumper 12 collide will be described with reference to FIG. When the front bumper 12 and the pedestrian (its leg) collide, the pedestrian having a higher center of gravity than the bumper tends to fall to the rear side of the vehicle. Therefore, a load is applied to the bumper cover 16 mainly from the pedestrian toward the lower rear side of the vehicle (this is indicated by an arrow F2 in FIG. 4). The bumper cover 16 is deformed obliquely downward on the rear side of the vehicle, and is displaced toward the rear side of the vehicle by pressing the spacer portion 34. The spacer 34 displaced toward the vehicle rear side presses the chamber member 20 to compress and deform the chamber member 20, and the pressure sensor 24 outputs a signal corresponding to the pressure value of the pressure chamber 22.

  Here, on the rear side of the bumper cover 16 on the vehicle upper side of the spacer portion 34, a protruding member 44 protruding toward the vehicle rear side (a protruding portion corresponding to the protruding member 44 is integrated with the bumper cover 16 in a broad sense as described later) This is an element grasped as a “load input member” including the structure formed in the above. When colliding with a pedestrian, the bumper cover 16 is deformed diagonally downward to the rear of the vehicle as described above. Along with this, the projecting member 44 attached to the rear surface of the bumper cover 16 is also displaced obliquely downward to the rear of the vehicle and presses the spacer portion 34, thereby efficiently transmitting the load applied from the bumper cover 16 to the spacer portion 34. can do. At this time, the main body portion 32 enters the gap G1 located on the vehicle upper side of the protruding portion 42 provided on the bumper cover 16, so that load transmission from the bumper cover 16 to the main body portion 32 is suppressed.

  When a load is applied from the bumper cover 16 to the spacer portion 34 via the protruding member 44, the spacer portion 34 is displaced toward the vehicle rear side while the connecting portion 36 is deformed or broken as shown in FIG. Compared with the main body 32, 34 is largely displaced toward the vehicle rear side. Further, in the present embodiment, since the opening portion 28 is provided in the connection portion 36, the connection portion 36 is likely to be deformed or broken. That is, the displacement amount of the spacer portion 34 toward the vehicle rear side can be increased, and the detection pressure can be increased by increasing the deformation amount of the chamber member 20. As described above, by increasing the difference from the detected pressure when colliding with an object other than a pedestrian, it is possible to improve the determination accuracy of whether or not the colliding body is a pedestrian.

  Here, a high bending moment acts on the lower end portion 36A of the connecting portion. By disposing the opening 28 at this position, the spacer portion 34 can be displaced rearward more efficiently and the amount of deformation of the chamber member 20 can be increased, so that the collision object discrimination accuracy can be improved. it can.

  Furthermore, as shown in FIG. 1, the opening 28 is arranged in a region where the license plate 40 is attached in a vehicle front view. The license plate 40 is generally made of metal, and when the pedestrian collides with the area, the load is dispersed by the license plate 40, so that the deformation of the bumper cover 16 is suppressed. That is, the load applied from the bumper cover 16 to the spacer portion 34 is reduced. Therefore, by arranging the opening 28 in the connection portion 36 in the region, the connection portion 36 is easily deformed or broken even when the load applied from the bumper cover 16 is low, and the spacer portion 34 is moved to the rear of the vehicle. The amount of displacement can be increased.

  In the present embodiment, the opening 28 is all disposed in the region where the license plate 40 is attached as viewed from the front of the vehicle. However, the opening 28 extends outside the license plate 40 in the vehicle width direction. May be. In this case, the effect that the spacer part 34 can be displaced to the vehicle rear side more efficiently by the license plate 40 displaced to the vehicle rear side is obtained.

  From the above viewpoint, the thickness of the connecting portion 36 in the vehicle front-rear direction is reduced in order to easily cause deformation or breakage of the connecting portion 36 and increase the amount of displacement of the spacer portion 34 toward the vehicle rear side. Can be considered. For example, the connecting portion 36 can be thinly formed by resin injection molding or the like. However, if the thickness of the connecting portion 36 is reduced, it is easy to deform in the vehicle vertical direction simultaneously with the vehicle longitudinal deformation. That is, the rigidity of the absorber 30 in the vertical direction of the vehicle decreases.

  Further, in the present embodiment, the absorber 30 is made of foamed resin, and the main body portion 32, the connection portion 36, and the spacer portion 34 are integrally formed. In the case of forming an elongated part shape with such a foamed resin, a certain amount of thickness (foaming agent flow path) is required in order to cause foaming to flow in and foam. That is, when foamed resin is used as the material, the thinness of the connecting portion 36 has a manufacturing limit.

  Therefore, as in the present embodiment, by providing the opening portion 28 in the connecting portion 36, the connecting portion 36 ensures the rigidity of the absorber 30 in the vehicle vertical direction, and the spacer portion when a collision with a pedestrian occurs. The displacement of the vehicle 34 in the vehicle longitudinal direction can be facilitated.

  Furthermore, the opening 28 can be used as an air flow path toward the vehicle rear side. For example, the traveling wind from the front side of the vehicle can be taken in and passed through the opening 28 provided in the absorber 30 and introduced into a radiator (not shown) on the rear side of the vehicle. In that case, it has the effect that the cooling performance of a radiator can be improved.

  In addition, when the absorber 30 is formed by foam molding, it is also possible to provide a long opening hole 38 in the vehicle width direction in the connection portion 36 located between the main body portion 32 and the spacer portion 34. Difficult due to technical constraints.

  Therefore, in the present embodiment, the opening 28 is constituted by a plurality of opening holes 38, and a part of the connecting portion 36 is disposed between the opening holes 38 to form a flow path for the foaming agent. Therefore, not only can the opening 28 long in the vehicle width direction be configured, but also an effect that the absorber 30 having the longitudinal direction in the vehicle width direction can be formed of foamed resin as a single member is obtained.

  Further, by configuring the opening portion 28 with a plurality of opening holes 38, the arrangement and shape of each opening hole 38 and the arrangement in the vehicle width direction can be changed to adjust the rigidity of the connecting portion 36. Further, since the main body portion 32 and the spacer portion 34 are connected in the vertical direction of the vehicle between each opening hole 38 (a part of the connection portion is configured), the absorber 30 has a certain rigidity in the vertical direction of the vehicle. The displacement amount of the spacer portion 34 in the vehicle front-rear direction can be adjusted while maintaining.

  In the above-described embodiment, it is sufficient that at least one opening hole 38 constituting the opening 28 is provided, and the shape is not limited to a rectangle. Also, when a plurality of opening holes 38 are provided, the shape and size of each opening hole 38 may be different. Further, the arrangement of the opening holes 38 is not limited to left-right symmetry.

  Moreover, although the protrusion member 44 was comprised as another member attached to the rear surface of the bumper cover 16, it is not restricted to this, A part of bumper cover 16 may protrude in the vehicle rear side.

(Second Embodiment)
Next, the vehicle bumper according to the second embodiment will be described with reference to FIG. 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 second embodiment is characterized in that the absorber is divided into upper and lower parts and is constituted by separate members with respect to the first embodiment. Hereinafter, the shape and arrangement of the absorber in the second embodiment will be described.

  As shown in FIG. 5, the absorber 70 according to the second embodiment is configured by separately arranging an absorber member 72 and a spacer member 74 that are separately formed in the vehicle vertical direction.

  The absorber member 72 is disposed between the bumper RF14 and the bumper cover 16 with the vehicle width direction as a longitudinal direction, and is fixed to the vehicle body at both ends (not shown) in the vehicle width direction as an example. In this embodiment, the absorber member 72 is formed of a foamed resin.

  The absorber member 72 is disposed between the bumper cover 16 and the bumper RF14 below the chamber member 20 in the vehicle, and is disposed adjacent to the rear surface of the bumper cover 16 and the front wall 14A of the bumper RF14.

  As an example, the spacer member 74 is disposed between the bumper cover 16 and the chamber member 20 above the absorber member 72 as shown by a two-dot chain line in FIG. 1, and the rear surface of the bumper cover 16 and the front surface 20A of the chamber member 20 are arranged. It is interposed and fixed to the back surface of the bumper cover 16 by bonding. Note that the fixing method and the fixing position are not limited to this, and the spacer member 74 may be fixed to a member to be attached such as a vehicle body by fixing means other than adhesion on both ends of the vehicle.

  The spacer member 74 is disposed between the front end 72A and the rear end 72B of the absorber member 72 in the vehicle longitudinal direction. That is, the front end 74 </ b> A of the spacer member 74 is located behind the vehicle from the front end 72 </ b> A of the absorber member 72 and ahead of the vehicle from the rear end 72 </ b> B of the absorber member 72.

  Further, an extended portion 48 extending from the front surface 20 </ b> A of the chamber member 20 toward the vehicle rear side is provided from the upper end of the spacer member 74. A plurality of ribs 46 are provided in the vehicle width direction on the rear surface of the spacer member 74, and the end surface of the rib 46 at the rear end of the vehicle is disposed adjacent to the front surface 20 </ b> A of the chamber member 20.

  Next, the operation and effect of the second embodiment will be described.

(When an object other than a pedestrian collides with the front bumper 12)
When an object other than a pedestrian collides with the front bumper 12, the object collides with the vehicle substantially horizontally in the vehicle front-rear direction, and the bumper cover 16 also deforms substantially horizontally in the vehicle front-rear direction. Here, since the front end 72A of the absorber member 72 is disposed in front of the vehicle from the front end 74A of the spacer member 74, the absorber member 72 is positioned before the spacer member 74 with respect to a load applied substantially horizontally in the vehicle front-rear direction. The impact load is received, and the load is transmitted to the bumper RF14 while being compressed and deformed.

  In addition, since the bumper cover 16 is provided with a protruding portion 42 that protrudes toward the vehicle rear side at a height corresponding to the absorber member 72, the load applied from the object is efficiently applied to the absorber member 72 located on the vehicle rear side. Can communicate. That is, the load is hardly transmitted to the spacer member 74, and the deformation of the chamber member 20 is suppressed.

(When pedestrian and front bumper 12 collide)
On the other hand, when the front bumper 12 and the pedestrian (its leg) collide, the pedestrian tries to fall down to the vehicle rear side. Therefore, a load acts on the bumper cover 16 mainly from the pedestrian toward the lower rear side of the vehicle. Then, the bumper cover 16 is deformed obliquely downward on the rear side of the vehicle, and the spacer member 74 is displaced toward the rear side of the vehicle (the obliquely lower side of the vehicle rear). The spacer member 74 displaced toward the vehicle rear side presses the chamber member 20 to compress and deform the chamber member 20, and the pressure sensor 24 outputs a signal corresponding to the pressure value inside the chamber member 20.

  Here, in the present embodiment, the spacer member 74 is disposed separately from the absorber member 72 and spaced apart in the vehicle vertical direction, so that it can be displaced to the vehicle rear side independently of the absorber member 72. For this reason, the displacement amount of the spacer member 74 toward the vehicle rear side can be increased, and the detection pressure can be increased by increasing the deformation amount of the chamber member 20. That is, by increasing the difference from the detected pressure when colliding with an object other than a pedestrian, it is possible to improve the determination accuracy of whether or not the colliding body is a pedestrian.

  On the other hand, when the spacer member 74 is displaced independently of the absorber member 72, the displacement direction of the spacer member 74 changes depending on the direction of the load applied by the pedestrian. That is, there is a concern that the position in the vehicle vertical direction when the spacer member 74 is displaced rearward of the vehicle and hits the chamber member 20 is not stable. However, in the present embodiment, an extending portion 48 extending from the upper end of the spacer member 74 to the vehicle rear side from the front surface 20A of the chamber member 20 is provided. For this reason, the extension part 48 is displaced to the vehicle rear side while pressing the chamber member 20 from the vehicle upper side, and the effect that the deformation of the chamber member 20 can be stabilized is obtained.

  Furthermore, by forming the spacer member 74 and the absorber member 72 separately, it is possible to easily mold them with resins having different foaming rates. As an example, the hardness can be increased by reducing the foaming rate of the absorber member 72 as compared to the spacer member 74. In this case, since the amount of compression of the absorber member 72 when an object other than a pedestrian collides can be suppressed and more load can be transmitted to the bumper RF 14, the amount of displacement of the spacer member 74 toward the rear of the vehicle is reduced. be able to. That is, the collision object discrimination performance can be improved. Thus, by changing each foaming rate, it has the effect that discrimination performance can be adjusted easily.

  In the present embodiment, the absorber member 72 and the spacer member 74 are both formed of foamed resin. However, the present invention is not limited to this. Either one or both of the absorber member 72 and the spacer member 74 may be molded by another manufacturing method / material such as resin injection molding.

  Note that the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

  For example, in each of the above embodiments, a chamber member is used as the hollow sensor member, but a tube-type hollow sensor may be used. In this case, the tube is attached to the rear surface of the spacer portion 34 or the spacer member 74. And when a pedestrian collides with the front bumper 12, a tube is displaced to the vehicle rear side with the spacer part 34 or the spacer member 74, and it presses against the bumper RF14 and compresses and deforms.

12 Front bumper (vehicle bumper)
14 Bumper reinforcement 16 Bumper cover 20 Chamber member (hollow sensor member)
24 Pressure sensor (pressure detector)
26 ECU (collision determination unit)
28 Opening 30 Absorber 32 Main Body 34 Spacer 36 Connection 38 Opening Hole 40 License Plate 70 Absorber 72 Absorber Member 74 Spacer Member

Claims (6)

Bumper reinforcement extending in the vehicle width direction,
A hollow sensor member that is disposed on the vehicle front side of the bumper reinforcement and that has a vehicle width direction as a longitudinal direction along the bumper reinforcement,
A pressure detector connected to the hollow sensor member and outputting a signal corresponding to a pressure change of the hollow sensor member;
A collision determination unit that is connected to the pressure detector and determines whether or not the vehicle has collided with a pedestrian based on a signal output from the pressure detector;
A bumper cover extending in the vehicle width direction on the vehicle front side of the bumper reinforcement;
The absorber is interposed between the bumper reinforcement and the bumper cover, and has an absorber having a main body disposed in the vehicle width direction as a longitudinal direction on the vehicle lower side of the hollow sensor member,
The absorber is
A spacer portion formed integrally with the main body portion and interposed between the hollow sensor member and the bumper cover on the vehicle upper side of the main body portion, and having a front end disposed on the vehicle rear side from the front end of the main body portion; ,
The main body portion and the spacer portion are connected in the vehicle vertical direction, and a connection portion provided with an opening penetrating in the thickness direction of the absorber,
A vehicle bumper characterized by comprising:   The vehicle bumper according to claim 1, wherein at least a part of the opening is provided at a position including a boundary between the main body and the connection.   The vehicle bumper according to claim 1, wherein the opening is configured by a plurality of opening holes provided side by side in the vehicle width direction.   4. The license plate according to claim 1, wherein a license plate is attached to a front surface of the bumper cover, and at least a part of the opening is disposed in a region overlapping the license plate in a front view of the vehicle. Vehicle bumper.   5. The vehicle bumper according to claim 4, wherein at least a part of the opening extends outward in a vehicle width direction from a region overlapping with the license plate in a front view of the vehicle. Bumper reinforcement extending in the vehicle width direction,
A hollow sensor member that is disposed on the vehicle front side of the bumper reinforcement and that has a vehicle width direction as a longitudinal direction along the bumper reinforcement,
A pressure detector connected to the hollow sensor member and outputting a signal corresponding to a pressure change of the hollow sensor member;
A collision determination unit that is connected to the pressure detector and determines whether or not the vehicle has collided with a pedestrian based on a signal output from the pressure detector;
A bumper cover extending in the vehicle width direction on the vehicle front side of the bumper reinforcement;
An absorber member interposed between the bumper reinforcement and the bumper cover, and disposed on the vehicle lower side of the hollow sensor member with a vehicle width direction as a longitudinal direction;
The absorber member is configured separately from the absorber member, and is attached to the vehicle body or the bumper cover via an attachment portion, and is disposed between the front end of the hollow sensor member and the rear surface of the bumper cover, and the front end is further connected to the absorber member. A spacer member positioned on the vehicle rear side from the front end and extending in the vehicle width direction;
Bumper for vehicles with

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