JP2015003620A - Bumper for vehicle equipped with pedestrian collision detection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the collision detection accuracy and prevent a reaction force on a pedestrian from being increased.SOLUTION: In a front bumper 12 comprising a collision determination system 10, a rib 26 is formed in an upper wall 18 and a lower wall 22 of a chamber member 16, and a horizontal dimension H2 of a front zone portion 30 (rear zone portion 32) of the chamber member 16 zoned by the rib 26 is equal to or less than a vertical dimension V. The rib 26 prevents an upper partition part 18A (lower partition part 22A) of the upper wall 18 (lower wall 22) from being displaced upward (downward). As a result, in the chamber member 16, the front zone portion 30 and the rear zone portion 32 are mainly deformed, which prevents a negative pressure from being produced in a pressure chamber 28. Since a vulnerability to crush of the front zone portion 30 can be set approximately equal to that of the rear zone portion 32, the bumper can prevent the reaction force of the entire chamber member 16 from being increased and prevent the output value from a pressure sensor 40 from being temporarily decreased.

Description

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

  In the pedestrian collision detection device described in Patent Document 1 below, the chamber member is configured to include a front part and a rear part, and the upper wall and the lower wall in the rear part are rib-shaped extending in the vehicle front-rear direction. Is formed. For this reason, the rear part of the chamber member is configured to be less crushed (not easily deformed) than the front part. Furthermore, the length in the vertical direction of the front part is set to be equal to or longer than the length in the front-rear direction. That is, the front portion is formed in a square shape or a rectangular shape whose longitudinal direction is the vertical direction in a side view.

  When the chamber member is compressed and deformed in the front-rear direction, the front portion set in the above dimensional relation is preferentially deformed, and therefore generation of negative pressure in the chamber member is suppressed. Thereby, since the output value output from a pressure sensor is suppressed temporarily becoming low (it becomes a negative pressure), the collision detection accuracy in a pedestrian collision detection apparatus can be improved. In addition, there exists a thing described in the following patent documents 2-patent documents 4 as a pedestrian collision detection apparatus.

JP 2013-14292 A JP 2010-47170 A JP 2009-208642 A JP 2011-246075 A

  However, in the pedestrian collision detection device, as described above, the rear portion of the chamber member is configured not to be crushed (not easily deformed), and thus the reaction force when the rear portion is deformed is increased. For this reason, we are anxious about the reaction force which acts on a collision body (pedestrian's leg part) becoming high. In addition, since the rear portion is configured not to be crushed, the crushing (deformation) of the chamber member becomes unstable, and the output value output from the pressure sensor becomes small.

  In view of the above fact, the present invention provides a vehicle bumper including a pedestrian collision detection device that can suppress an increase in reaction force acting on a pedestrian while improving collision detection accuracy. Objective.

  The bumper for vehicles provided with the pedestrian collision detection device according to claim 1 is arranged with the vehicle width direction as the longitudinal direction adjacent to the vehicle front-rear direction outer side surface of the bumper reinforcement arranged with the vehicle width direction as the longitudinal direction. And a chamber member whose inside is a pressure chamber, a pressure detector that outputs a signal corresponding to a pressure change in the pressure chamber, and a collision with a pedestrian based on the signal output by the pressure detector A collision determination unit that determines whether the chamber member is located, a bumper cover that is disposed on the vehicle longitudinal direction outside of the chamber member, and an absorber interposed between the bumper reinforcement, and an upper wall and a lower wall of the chamber member By dividing at least one side into a plurality of wall portions in the vehicle front-rear direction, the length in the vehicle front-rear direction of each wall portion is the length of the chamber member in the vehicle vertical direction. While the lower has a suppressing displacement suppression portion displacement in the said chamber member vertical outer portion separated in the upper wall and the lower wall.

  In the vehicular bumper provided with the pedestrian collision detection device according to claim 1, the bumper reinforcement is arranged with the vehicle width direction as a longitudinal direction. In addition, the vehicle front-rear outer side surface of bumper reinforcement (the front side surface for bumper reinforcement provided at the front of the vehicle and the rear side surface for bumper reinforcement provided at the rear of the vehicle) A chamber member is provided adjacent to. The chamber member is disposed with the vehicle width direction as a longitudinal direction, and the inside of the chamber member is a pressure chamber.

  Further, a bumper cover is provided outside the chamber member in the vehicle front-rear direction, and an absorber is interposed between the bumper cover and the bumper reinforcement. Thereby, the absorber and the chamber member are covered with the bumper cover.

  Here, the displacement suppressing portion divides at least one of the upper wall and the lower wall of the chamber member into a plurality of wall portions in the vehicle front-rear direction, so that the length in the vehicle front-rear direction of each wall portion is the vehicle vertical direction of the chamber member. The length is less than or equal to. That is, at least one of the upper wall and the lower wall is configured to include a portion (hereinafter referred to as a partitioning portion) partitioned by the displacement suppressing portion and a plurality of wall portions. Thus, the chamber member is partitioned into a plurality of parts in the vehicle front-rear direction with the partition part as a boundary, and one side of the partitioned part is constituted by the wall part. For this reason, since the length in the vehicle front-rear direction in each compartment is equal to or less than the length in the vehicle up-down direction, the shape of the compartment in the side view is, for example, a square or a rectangle whose longitudinal direction is the vehicle up-down direction.

  Then, displacement of the partitioning portion of at least one of the upper wall and the lower wall to the outside in the vertical direction of the chamber member (the vehicle upper side with respect to the upper wall and the vehicle lower side with respect to the lower wall) is suppressed by the displacement suppression unit. ing. For this reason, when the chamber member is compressively deformed in the vehicle front-rear direction, each partition portion set mainly in the above dimensional relationship is deformed, so that the generation of negative pressure in the pressure chamber is suppressed. Thereby, since the output value output from a pressure detector is suppressed temporarily becoming low, the collision detection precision in a pedestrian collision detection apparatus can be improved.

  Further, by setting the easiness of crushing in each partition part to be approximately the same, it is possible to suppress an increase in the rigidity of the entire chamber member in the vehicle front-rear direction, and it is possible to deform each partition part substantially simultaneously. As a result, it is possible to suppress an increase in the reaction force of the entire chamber member when the chamber member is compressed and deformed in the vehicle longitudinal direction, and it is possible to suppress an output value from the pressure detector from being reduced. Thereby, it can suppress that the reaction force which acts on a pedestrian becomes high.

  A vehicle bumper comprising the pedestrian collision detection device according to claim 2 is the vehicle bumper according to claim 1, wherein the displacement suppression portion is provided on at least one of the upper wall and the lower wall. It is formed in a rib shape extending in the width direction.

  In the vehicular bumper provided with the pedestrian collision detection device according to claim 2, the upper wall portion and the lower wall portion provided with the displacement suppressing portion are defined as the delimiter portions. And since the thickness of the said partition part becomes thick compared with the thickness of each wall part, the rigidity of a partition part becomes high compared with the rigidity of each wall part. Thereby, the displacement to the chamber member up-down direction outer side of the said division | segmentation part can be suppressed with a simple structure.

  A bumper for a vehicle provided with the pedestrian collision detection device according to claim 3, according to the invention according to claim 2, further comprising a cover arranged to face the upper wall in the vehicle vertical direction, and the absorber is It has an opposing part arranged facing the lower wall in the up-and-down direction of the vehicle, and the displacement suppression part is configured to be able to contact the opposing cover or the opposing part.

  In the vehicle bumper provided with the pedestrian collision detection device according to claim 3, the cover is disposed to face the upper wall on the upper side of the vehicle on the upper wall, and the opposing portion of the absorber is located on the lower side of the vehicle on the lower wall. It is arranged facing the lower wall. And the displacement suppression part is comprised so that contact | abutting with the opposing part of the cover or absorber which opposes is possible. For this reason, the displacement of the partition part (displacement suppressing part) to the outside in the vertical direction of the chamber member is also suppressed by the cover or the absorber. Thereby, suppression of the displacement with respect to a division part can be stabilized.

  A bumper for a vehicle provided with the pedestrian collision detection device according to claim 4 is the invention according to claim 1, further comprising a cover arranged to face the upper wall in the vehicle vertical direction, It has a facing portion that is arranged to face the lower wall in the vehicle vertical direction, and the displacement suppression portion is provided in at least one of the cover and the facing portion, and is formed in a rib shape extending in the vehicle width direction. And it is comprised so that abutment with the said upper wall or the said lower wall which opposes is possible.

  In the vehicle bumper provided with the pedestrian collision detection device according to claim 4, the cover is disposed on the upper side of the vehicle on the upper side of the vehicle so as to face the upper wall, and the opposite portion of the absorber is provided on the lower side of the vehicle on the lower side. It is arranged facing the lower wall. A displacement suppressing portion is provided on at least one of the cover and the absorber (opposing portion), and the displacement suppressing portion is formed in a rib shape extending in the vehicle width direction and abuts against the opposing upper wall or lower wall. It is configured to be possible.

  As a result, a portion of the chamber member (upper wall, lower wall) that comes into contact with the displacement suppression portion is defined as a partition portion, and the displacement of the partition portion to the outside in the vertical direction of the chamber member is suppressed by the cover or the absorber. Therefore, the displacement of the partitioning portion in the vertical direction outside the chamber member can be suppressed using the cover and the absorber.

  The bumper for vehicles provided with the pedestrian collision detection device according to claim 5 is the vehicle bumper according to claim 1, wherein the displacement suppressing portion connects the upper wall and the lower wall inside the chamber member. To do.

  In the vehicle bumper provided with the pedestrian collision detection device according to claim 5, since the displacement suppressing portion connects the upper wall and the lower wall inside the chamber member, the partition member has an outer side in the vertical direction. Can be effectively suppressed.

  According to the vehicle bumper provided with the pedestrian collision detection device according to claim 1, it is possible to suppress an increase in reaction force acting on the pedestrian while improving collision detection accuracy.

  According to the bumper for vehicles provided with the pedestrian collision detection device according to claim 2, the displacement of the partitioning portion in the vertical direction outside of the chamber member can be suppressed with a simple configuration.

  According to the vehicle bumper provided with the pedestrian collision detection device according to claim 3, it is possible to stabilize the suppression of the displacement with respect to the partition portion.

  According to the vehicle bumper provided with the pedestrian collision detection device according to the fourth aspect, the displacement of the partitioning portion in the vertical direction outside of the chamber member can be suppressed using the cover and the absorber.

  According to the vehicle bumper provided with the pedestrian collision detection device according to claim 5, it is possible to effectively suppress the displacement of the partition portion to the outside in the vertical direction of the chamber member.

It is a typical side sectional view (1-1 line expanded sectional view of Drawing 2) showing the schematic structure of the front bumper provided with the collision judging system concerning a 1st embodiment. It is the partially broken top view seen from the vehicle upper side which shows the front bumper provided with the collision determination system shown by FIG. FIG. 2 is a schematic side cross-sectional view (side cross-sectional view corresponding to FIG. 1) showing a state in which the chamber member shown in FIG. 1 is compressed and deformed in the vehicle longitudinal direction. It is a typical sectional side view (side sectional view corresponding to FIG. 1) which shows the schematic structure of the front bumper provided with the collision determination system which concerns on 2nd Embodiment. It is a typical sectional side view (5-5 line expanded sectional view of FIG. 6) which shows the schematic structure of the front bumper provided with the collision determination system which concerns on 3rd Embodiment. FIG. 6 is a partially cutaway plan view of a front bumper provided with the collision determination system shown in FIG. It is a top view corresponding to FIG. 2 which shows another example of the shape of the rib shown by FIG. It is a top view corresponding to FIG. 2 which shows another example of the shape of the rib shown by FIG.

(First embodiment)

  Hereinafter, the front bumper 12 including the collision determination system 10 according to the first embodiment will be described with reference to FIGS. The collision determination system 10 corresponds to the pedestrian collision detection device of the present invention, and the front bumper 12 corresponds to the vehicle bumper of the present invention. In addition, an arrow FR appropriately shown in the drawings indicates the vehicle front side, an arrow RH indicates the vehicle right side (one side in the vehicle width direction), and an arrow UP indicates the vehicle upper side.

  As shown in FIGS. 1 and 2, the collision determination system 10 is applied to a front bumper 12 disposed at the front end of a vehicle (automobile) so as to determine whether or not there is a collision with the front bumper 12. It has become. This will be specifically described below.

  The front bumper 12 includes a bumper reinforcement (hereinafter referred to as “bumper R / F”) 14 which is a bumper skeleton member. The bumper R / F 14 is made of, for example, a metal material such as iron or aluminum, and is configured as a skeleton member arranged with the vehicle width direction as a longitudinal direction. Further, the bumper R / F 14 is supported with respect to the vehicle body across the front ends of a pair of left and right front side members 15 (see FIG. 2) constituting the skeleton member on the vehicle body side. Further, both side portions of the bumper R / F 14 in the vehicle width direction are inclined toward the vehicle rear side toward the both sides in the vehicle width direction in plan view.

  A chamber member 16 made of a resin material is provided on the outer side in the vehicle front-rear direction of the bumper R / F 14, that is, on the front side of the vehicle. The chamber member 16 is configured as a hollow structure arranged with the vehicle width direction as a longitudinal direction, and the internal space of the chamber member 16 is a pressure chamber 28. The chamber member 16 is fixedly attached to the front surface 14A (vehicle front-rear direction outer surface) of the bumper R / F 14, and both side portions of the chamber member 16 in the vehicle width direction are along the bumper R / F 14 in plan view. The vehicle is inclined toward the vehicle rear side as it goes to both sides in the vehicle width direction. The both ends in the longitudinal direction of the chamber member 16 are set at positions substantially coincident with the both ends of the bumper R / F 14.

  Further, in the chamber member 16, the horizontal dimension H1 in the vehicle front-rear direction is set larger than the vertical dimension V in the vehicle vertical direction at portions excluding both ends in the vehicle width direction (portions shown by the grid pattern in FIG. 2). Has been. That is, the chamber member 16 is formed in a substantially rectangular shape having the longitudinal direction in the vehicle front-rear direction as a whole in a side sectional view. The horizontal dimension H1 is set to be equal to or less than the vertical dimension V at both ends of the chamber member 16 in the vehicle width direction. Further, the thickness of each of the upper wall 18, the front wall 20, the lower wall 22, and the rear wall 24 of the chamber member 16 is set to be the same.

  Further, the upper wall 18 and the lower wall 22 of the chamber member 16 are integrally formed with ribs 26 as “displacement suppressing portions”, respectively, in portions excluding both ends in the vehicle width direction. The ribs 26 are formed in a substantially trapezoidal cross section in a side sectional view, and are respectively located on the upper and lower sides of the chamber member 16 from the upper wall 18 and the lower wall 22 (on the vehicle upper side and the lower wall 22 with respect to the upper wall 18) It protrudes to the lower side of the vehicle. Further, the rib 26 is disposed in the vehicle front-rear direction center portion of the upper wall 18 and the lower wall 22 in a side cross-sectional view of the chamber member 16 in the vehicle width direction center portion, and substantially along the vehicle width direction in plan view. It extends in a straight line. The longitudinal ends of the ribs 26 intersect the front wall 20 of the chamber member 16 in plan view.

  Thereby, a part of the upper wall 18 and the lower wall 22 (parts excluding both ends in the vehicle width direction) is partitioned in the vehicle front-rear direction by the pair of ribs 26. The portions of the upper wall 18 and the lower wall 22 that are partitioned by the ribs 26 (portions where the ribs 26 are formed) are respectively grasped as the upper partitioning portion 18A and the lower partitioning portion 22A (in the broad sense, “partitioning portions”). Element). Further, portions of the upper wall 18 and the lower wall 22 excluding the upper partitioning portion 18A and the lower partitioning portion 22A are respectively a first wall portion 18B and a second wall portion 22B as “wall portions”. And the horizontal dimension H2 of the vehicle front-back direction of each 1st wall part 18B and each 2nd wall part 22B is set to below the vertical dimension V of the vehicle up-down direction of the chamber member 16 by the side sectional view along a vehicle front-back direction. Has been.

  For this reason, a part of the chamber member 16 (a part excluding both ends in the vehicle width direction) is divided into two parts in the vehicle front-rear direction by the pair of ribs 26. And these divided parts are respectively located in the front compartment part 30 (the part on the vehicle front side from the two-dot chain line A shown in FIG. 1) and the rear compartment part 32 (the two-dot chain line B shown in FIG. 1 on the vehicle rear side). Part). Further, since the front partition part 30 and the rear partition part 32 are configured to include the first wall part 18B and the second wall part 22B, the shapes of the front partition part 30 and the rear partition part 32 in a side view are square or It is a rectangle whose longitudinal direction is the vehicle vertical direction.

  Further, the chamber member 16 has rigidity capable of maintaining its shape (hollow cross-sectional shape) in a state of being fixedly attached to the bumper R / F 14 as described above, and communicates with the atmosphere at a position not shown. Communication holes. Accordingly, normally (statically), the pressure chamber 28 is at atmospheric pressure. The chamber member 16 receives a relatively low compressive load from the front side of the vehicle and is crushed while allowing air to escape from the communication hole, so that the volume of the pressure chamber 28 is reduced while dynamically changing the internal pressure of the pressure chamber 28. It has become.

  Further, as shown in FIG. 1, the collision determination system 10 includes a pressure sensor 40 as a “pressure detector”, and the pressure sensor 40 is electrically connected to an ECU 42 as a “collision determination unit”. ing. The pressure sensor 40 outputs a signal corresponding to the pressure in the pressure chamber 28 to the ECU 42. The ECU 42 is configured to calculate the collision load based on the output signal of the pressure sensor 40. The ECU 42 is electrically connected with a collision speed sensor (not shown). The collision speed sensor outputs a signal corresponding to the collision speed with the collision body to the ECU 42, and the ECU 42 calculates the collision speed based on the output signal of the collision speed sensor. Then, the ECU 42 determines the effective mass of the collision object from the calculated collision load and collision speed, determines whether the effective mass exceeds a threshold value, and determines whether the collision object to the front bumper 12 is a pedestrian. Whether it is a person other than a pedestrian (for example, a roadside marker, a post cone, etc.) is determined.

  An absorber 44 is provided on the vehicle front side of the bumper R / F 14 on the vehicle lower side of the chamber member 16. The absorber 44 is made of a foamed resin material, that is, urethane foam. The absorber 44 is formed in a long shape with the vehicle width direction as a longitudinal direction, and is formed in a substantially rectangular shape in a side sectional view. The absorber 44 is disposed along the bumper R / F 14 in a plan view, and is fixed (contacted) to the front surface 14A of the bumper R / F 14 at the rear end. Further, the upper surface 44A of the absorber 44 corresponds to a facing portion of the present invention, and the upper surface 44A is disposed to face the lower surface of the lower wall 22 of the chamber member 16 in the vehicle vertical direction. A gap G1 is formed between the lower surface of the lower wall 22 and the upper surface 44A of the absorber 44. When the bumper cover 46 described later presses the chamber member 16 and the chamber member 16 is deformed, The gap G <b> 1 is formed so that the lower wall 22 (second wall portion 22 </ b> B) of the chamber member 16 does not interfere with the absorber 44.

  The front bumper 12 includes a bumper cover 46 made of a resin material or the like. The bumper cover 46 is disposed so as to face both the chamber member 16 and the absorber 44 on the vehicle front side, and is fixedly supported to the vehicle body at a portion not shown. A gap G <b> 2 is formed between the bumper cover 46 and the chamber member 16. That is, the bumper cover 46 is deformed and presses the chamber member 16 in a collision between a collision object such as a pedestrian and the vehicle (bumper cover 46). Further, both side portions in the vehicle width direction of the bumper cover 46 are inclined toward the rear side of the vehicle as it goes to both sides in the vehicle width direction in plan view.

  Next, functions and effects in the present embodiment will be described.

  In the front bumper 12 provided with the collision determination system 10 configured as described above, when a pedestrian (its leg) collides with a vehicle (bumper cover 46), the pedestrian falls on the hood of the vehicle. Therefore, a collision load mainly acts on the bumper cover 46 from the pedestrian diagonally downward to the rear of the vehicle. For this reason, the bumper cover 46 is deformed so as to fall down toward the chamber member 16 and presses the chamber member 16. As a result, the chamber member 16 is compressed and deformed in the vehicle front-rear direction, and the pressure in the pressure chamber 28 changes.

  Then, the pressure sensor 40 outputs a signal corresponding to the pressure change in the pressure chamber 28 to the ECU 42, and the ECU 42 calculates the collision load based on the output signal of the pressure sensor 40. Further, the ECU 42 calculates the collision speed based on the output signal of the collision speed sensor. Thereby, ECU42 calculates | requires the effective mass of a collision body from the calculated collision load and collision speed, judges whether an effective mass exceeds a threshold value, and the collision body to the front bumper 12 is a pedestrian. It is determined whether or not.

  On the other hand, in a collision between a collision body other than a pedestrian and the vehicle (bumper cover 46), the collision body enters substantially horizontally with respect to the bumper cover 46. Therefore, a collision load mainly on the rear side of the vehicle is applied to the bumper cover 46. Works. For this reason, the bumper cover 46 is deformed toward the chamber member 16 and presses the chamber member 16 substantially horizontally. As a result, the chamber member 16 is compressed and deformed in the vehicle front-rear direction, and the pressure in the pressure chamber 28 changes.

  Here, a rib 26 is integrally formed on each of the upper wall 18 and the lower wall 22 of the chamber member 16, and the upper wall 18 (lower wall 22) is formed at two first positions in the vehicle front-rear direction by the rib 26. It is divided into wall portions 18B (second wall portions 22B). The horizontal dimension H2 of the first wall 18B (second wall 22B) is set to be equal to or less than the vertical dimension V of the chamber member 16. That is, the horizontal dimension H2 of the front partition part 30 (the rear partition part 32) of the chamber member 16 partitioned by the pair of ribs 26 is set to be equal to or less than the vertical dimension V of the chamber member 16.

  Furthermore, as described above, since the rib 26 is formed integrally with the upper partition 18A (lower partition 22A), the upper partition 18A (lower partition 22A) on the upper wall 18 (lower wall 22). ) Is set to be thicker than the thickness of the first wall 18B (second wall 22B). For this reason, the rigidity of the upper partition 18A (lower partition 22A) is higher than the rigidity of the first wall 18B (second wall 22B). Thereby, in the upper wall 18 (lower wall 22), the displacement of the upper partition 18A (lower partition 22A) to the vehicle upper side (vehicle lower side) is suppressed. As a result, as shown in FIG. 3, when the chamber member 16 is compressed and deformed in the vehicle front-rear direction, the front compartment portion 30 and the rear compartment portion 32 set in the above dimensional relationship are mainly deformed. The generation of negative pressure at 28 is suppressed. Thereby, since it is suppressed that the output value output from the pressure sensor 40 becomes low temporarily, the collision detection precision in the collision determination system 10 can be improved.

  Further, as described above, in the upper wall 18 (lower wall 22), displacement of the upper partitioning portion 18A (lower partitioning portion 22A) to the vehicle upper side (vehicle lower side) is suppressed, The easiness of crushing of the front partition part 30 and the rear partition part 32 can be set substantially equal. For this reason, it can suppress that the rigidity of the chamber member 16 whole in the vehicle front-back direction becomes high, and can deform | transform the front division site | part 30 and the rear division site | part 32 substantially simultaneously. As a result, an increase in the reaction force of the entire chamber member 16 when the chamber member 16 is compressed and deformed in the vehicle front-rear direction can be suppressed, and an output value from the pressure sensor 40 can be suppressed from decreasing. Thereby, it can suppress that the reaction force which acts on a pedestrian becomes high.

  Further, the rib 26 is provided integrally with the chamber member 16. For this reason, the displacement of the upper partition 18A (lower partition 22A) to the vehicle upper side (vehicle lower side) can be suppressed with a simple configuration.

(Second Embodiment)

  Hereinafter, a second embodiment will be described with reference to FIG. The front bumper 12 including the collision determination system 100 according to the second embodiment is configured similarly to the front bumper 12 including the collision determination system 10 according to the first embodiment except for the following points. Has been. In addition, the same code | symbol is attached | subjected to the member comprised similarly to the collision determination system 10 which concerns on 1st Embodiment.

  That is, in the second embodiment, the cover 102 is provided on the vehicle upper side of the chamber member 16. The cover 102 is formed in a substantially long plate shape in which the vehicle width direction is the longitudinal direction, and is disposed with the plate thickness direction being the vehicle vertical direction. And although illustration is abbreviate | omitted, the cover 102 is being fixed to bumper R / F14 in the rear-end part. Thereby, pebbles or the like that have entered the vehicle upper side of the chamber member 16 from the bumper cover 46 are prevented from hitting the chamber member 16.

  Further, the tip (upper end) of the rib 26 provided on the upper wall 18 of the chamber member 16 is in contact with the lower surface of the cover 102, and the tip of the rib 26 provided on the lower wall 22 of the chamber member 16. The (lower end) is in contact with the upper surface 44A of the absorber 44. For this reason, the displacement of the chamber member 16 in the vertical direction outside the pair of ribs 26 (the upper partitioning portion 18 </ b> A and the lower partitioning portion 22 </ b> A) is also suppressed by the cover 102 and the absorber 44. Thereby, also in 2nd Embodiment, there can exist an effect | action and effect similar to 1st Embodiment.

  In the second embodiment, as described above, the displacement of the chamber member 16 in the vertical direction outside of the upper partitioning portion 18A and the lower partitioning portion 22A is also suppressed by the cover 102 and the absorber 44. The suppression of the displacement with respect to the upper partition portion 18A and the lower partition portion 22A can be stabilized.

  In the second embodiment, the pair of ribs 26 are provided on the chamber member 16, and the ribs 26 are in contact with the cover 102 and the absorber 44, respectively. Instead of this, the ribs 26 may be provided integrally with the cover 102 and the absorber 44 so that the ribs 26 abut on the upper partitioning portion 18A of the upper wall 18 and the lower partitioning portion 22A of the lower wall 22. .

  In the second embodiment, the tip of the rib 26 is in contact with the cover 102 and the absorber 44, but a slight gap is provided between the tip of the rib 26 and the cover 102 and the absorber 44. May be.

  Furthermore, in the first embodiment and the second embodiment, ribs 26 are formed on the upper wall 18 and the lower wall 22 of the chamber member 16, but the upper wall 18 and the lower wall 22 of the chamber member 16 are formed. The ribs 26 may be formed only on one side. In the second embodiment, when the rib 26 is formed on the cover 102 and the absorber 44, the rib 26 may be formed on only one of the cover 102 and the absorber 44.

(Third embodiment)

  A third embodiment will be described with reference to FIGS. The front bumper 12 including the collision determination system 200 according to the third embodiment is configured similarly to the front bumper 12 including the collision determination system 10 according to the first embodiment except for the following points. Has been. In addition, the same code | symbol is attached | subjected to the member comprised similarly to the collision determination system 10 which concerns on 1st Embodiment.

  That is, in the third embodiment, the pair of ribs 26 are omitted from the chamber member 16. A plurality of partition columns 202 as “displacement suppressing portions” are integrally formed in the chamber member 16, and the partition columns 202 are arranged at predetermined intervals in the vehicle width direction. The partition column 202 is formed in a substantially cylindrical shape, is arranged with the axial direction being the vehicle vertical direction, and connects the upper wall 18 and the lower wall 22.

  As shown in FIG. 5, the horizontal dimension H <b> 2 of the first wall portion 18 </ b> B and the second wall portion 22 </ b> B is equal to or less than the vertical dimension V of the chamber member 16 in a side sectional view passing through the axis of the partition column 202. Is set. Thereby, in the third embodiment, the chamber member 16 is partitioned into the front partition part 30 and the rear partition part 32 in the vehicle front-rear direction by the plurality of partitioning columns 202, and the front partition part 30 and the rear The partition part 32 communicates between the partition pillars 202. And since the horizontal dimension H2 of the front division site | part 30 (back division site | part 32) is set to the vertical dimension V or less, also in 3rd Embodiment, the effect | action and effect similar to 1st Embodiment are obtained. Can play.

  In the third embodiment, since the partition column 202 is provided inside the chamber member 16, the displacement of the upper partition 18A (lower partition 22A) to the vehicle upper side (vehicle lower side) is effective. Can be suppressed.

  In the third embodiment, the partitioning column 202 is integrally provided inside the chamber member 16, but the chamber member 16 and the partitioning column 202 may be configured as separate members.

  Further, in the first embodiment and the second embodiment, the ribs 26 are formed on the portions of the chamber member 16 excluding both ends in the vehicle width direction. However, the ribs 26 are flat corresponding to the chamber members 16 of various vehicles. The shape of the rib 26 in view may be changed as appropriate.

  For example, as shown in FIG. 7, when the horizontal dimension H1 of the chamber member 16 is set to be larger than the vertical dimension V in the vehicle width direction, the rib 26 extends over the entire area of the chamber member 16 in the vehicle width direction. May be formed. In this case, you may set so that the shape of the front division site | part 30 and the rear division site | part 32 in a side sectional view may become fixed over a vehicle width direction. Thereby, the difference of the output change of the pressure sensor 40 in each site | part of the vehicle width direction of the chamber member 16 can be made small.

  Further, as shown in FIG. 8, when the horizontal dimension H1 at both end portions in the vehicle width direction of the chamber member 16 (the white portions in FIG. 8) is set to the vertical dimension V or less, the vehicle width direction The ribs 26 may be provided in portions other than the both end portions, and both end portions in the longitudinal direction of the ribs 26 may be inclined toward the vehicle rear side toward the vehicle width direction both sides. In this case, the horizontal dimension H1 (see FIG. 8) of both ends in the vehicle width direction of the chamber member 16 is the same as the horizontal dimension H2 of the first wall portion 18B defined by the ribs 26 extending linearly in plan view. As such, the position in the vehicle width direction at both longitudinal ends of the ribs 26 may be set. That is, the horizontal dimension H2 is set so as to decrease toward both sides in the vehicle width direction at both ends in the vehicle width direction of the first wall portion 18B (portions shown in a lattice shape in FIG. 8). Thereby, also in this case, the difference in the output displacement of the pressure sensor 40 in each part of the chamber member 16 in the vehicle width direction can be reduced.

  Furthermore, in the first to third embodiments, the chamber member 16 is partitioned into two partition parts in the vehicle front-rear direction by the ribs 26 or the partition pillars 202. You may divide into three or more division parts in the direction. For example, in the first embodiment, a pair of ribs 26 are provided on the upper wall 18 and the lower wall 22 so as to be aligned in the vehicle front-rear direction, and the chamber member 16 is partitioned into three partition parts in the vehicle front-rear direction. Also good.

In the first to third embodiments, the example in which the collision determination systems 10, 100, and 200 are applied to the front bumper 12 is shown. However, the present invention is not limited to this, and for example, The above configurations may be reversed and applied to the rear bumper.

10 Collision determination system (pedestrian collision detection device)
12 Front bumper (vehicle bumper)
14 Bumper reinforcement 16 Chamber member 18 Upper wall 18B 1st wall part 22 Lower wall 22B 2nd wall part 26 Rib (displacement suppression part)
28 Pressure chamber 40 Pressure sensor (pressure detector)
42 ECU
44 Absorber 44A Upper surface of the absorber (opposite part)
46 Bumper cover 100 Collision determination system (pedestrian collision detection device)
102 Cover 200 Collision determination system (pedestrian collision detection device)
202 Partition (displacement suppression part)
H2 horizontal dimension (length in the longitudinal direction of the vehicle)
V Vertical dimension (length in the vertical direction of the vehicle)

Claims (5)

A chamber member that is disposed with the vehicle width direction as the longitudinal direction adjacent to the vehicle front-rear direction outer side surface of the bumper reinforcement disposed with the vehicle width direction as the longitudinal direction;
A pressure detector that outputs a signal corresponding to a pressure change in the pressure chamber;
A collision determination unit that determines whether or not the vehicle has collided with a pedestrian based on a signal output by the pressure detector;
An absorber interposed between the bumper cover and the bumper reinforcement disposed outside the chamber member in the vehicle longitudinal direction; and
By dividing at least one of the upper wall and the lower wall of the chamber member into a plurality of wall portions in the vehicle front-rear direction, the length of each wall portion in the vehicle front-rear direction is made equal to or shorter than the length of the chamber member in the vehicle vertical direction. And a displacement suppression unit that suppresses displacement of the portion partitioned by the upper wall and the lower wall to the outside in the vertical direction of the chamber member,
Bumper for vehicles provided with the pedestrian collision detection apparatus which has.   2. The vehicle bumper provided with the pedestrian collision detection device according to claim 1, wherein the displacement suppressing portion is provided on at least one of the upper wall and the lower wall and is formed in a rib shape extending in a vehicle width direction. A cover disposed opposite to the upper wall in the vehicle vertical direction;
The absorber has a facing portion arranged to face the lower wall in the vehicle vertical direction,
The bumper for vehicles provided with the pedestrian collision detection apparatus of Claim 2 comprised so that the said displacement suppression part could contact | abut with the said cover or the said opposing part which opposes. A cover disposed opposite to the upper wall in the vehicle vertical direction;
The absorber has a facing portion arranged to face the lower wall in the vehicle vertical direction,
The displacement suppressing portion is provided in at least one of the cover and the facing portion, is formed in a rib shape extending in the vehicle width direction, and is configured to be able to contact the facing upper wall or the lower wall. A vehicle bumper comprising the pedestrian collision detection device according to Item 1.   The bumper for vehicles provided with the pedestrian collision detection device according to claim 1 in which said displacement control part connects said upper wall and said lower wall inside said chamber member.

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