JP5994666B2 - Bumper for vehicle equipped with pedestrian collision detection device - Google Patents

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, a chamber member is arranged on the front side of the bumper reinforcement. In addition, a bumper absorber is disposed between the bumper reinforcement and the bumper cover. The bumper absorber includes a main body portion disposed on the vehicle member lower side of the chamber member and a gap filling portion disposed on the vehicle member front side of the chamber member. And.

  For example, in a collision between a pedestrian and a vehicle (bumper cover), the gap filling portion presses the chamber member, and the pressure in the pressure chamber (inside the chamber member) changes. Further, the pressure sensor outputs a signal corresponding to the pressure change in the pressure chamber to the ECU, and the ECU determines whether or not the collision object against the bumper cover is a pedestrian.

JP 2011-143825 A

  However, in the pedestrian collision detection device, the pressure sensor outputs when the pedestrian and the vehicle collide and when the vehicle collides with a vehicle other than the pedestrian (for example, a roadside marker or a post cone). If the difference between the output values is small, there is a possibility that the collision object with the vehicle cannot be distinguished well. Thereby, in the said pedestrian collision detection apparatus, there exists room for improvement in this point.

  An object of the present invention is to provide a vehicular bumper including a pedestrian collision detection device that can satisfactorily determine a collision object with a vehicle in consideration of the above facts.

  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 A deformation suppressing unit that is provided near one or the other and suppresses buckling deformation of one of the upper wall and the lower wall with respect to a load in the vehicle longitudinal direction; It has.

  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.

  In a collision between a pedestrian and a vehicle (bumper cover), since the pedestrian falls on the hood of the vehicle, a collision load from the pedestrian to the bumper cover is obliquely downward with respect to the vehicle longitudinal direction. Works. For this reason, the bumper cover is deformed so as to fall down to the chamber member side and presses the chamber member. Thereby, a collision load obliquely downward with respect to the longitudinal direction of the vehicle acts on the chamber member, the chamber member is deformed, and the pressure in the pressure chamber changes. And a pressure detector outputs the signal according to the pressure change of a pressure chamber to a collision determination part, and a collision determination part determines whether the collision body to a vehicle is a pedestrian.

  On the other hand, in a collision between a collision object other than a pedestrian (for example, a roadside marker, a post cone, etc.) and the vehicle, the collision object enters substantially horizontally with respect to the bumper cover. The impact load is applied. For this reason, the bumper cover is deformed to the chamber member side and presses the chamber member substantially horizontally. Thereby, a collision load inward in the vehicle longitudinal direction acts on the chamber member, the chamber member is deformed, and the pressure in the pressure chamber changes.

  Here, the deformation suppressing part is provided in the vicinity of one or both of the upper wall and the lower wall of the chamber member, and the buckling deformation of one of the upper wall and the lower wall with respect to the load in the vehicle longitudinal direction is the deformation suppressing part. It is suppressed by.

  For this reason, when a collision load inward in the vehicle longitudinal direction acts on the chamber member, the upper wall and the lower wall of the chamber member try to buckle and deform, but the deformation suppressing portion suppresses the buckling deformation of the upper or lower wall. Is done. For this reason, compared with the case where a deformation | transformation suppression part is abbreviate | omitted, the deformation amount of a chamber member can be made small. Thereby, the difference in the deformation amount of the chamber member between the case where the pedestrian and the vehicle collide and the case where the collision body other than the pedestrian collides with the vehicle becomes large. As a result, it is possible to satisfactorily identify the collision object with the vehicle.

  The vehicular bumper provided with the pedestrian collision detection device according to claim 2 is the vehicular bumper provided with the pedestrian collision detection device according to claim 1, wherein the deformation suppressing portion includes the upper wall and the lower wall. The thickness of one of the upper wall and the lower wall is set to be larger than the thickness of the other of the upper wall and the lower wall.

  In the vehicle bumper provided with the pedestrian collision detection device according to claim 2, the deformation suppressing portion is integrally provided on one of the upper wall and the lower wall of the chamber member. One thickness dimension is set larger than the other thickness dimension of the upper wall and the lower wall of the chamber member. For this reason, one of the upper wall and the lower wall is reinforced by the deformation suppressing portion, and one buckling deformation of the upper wall and the lower wall with respect to the load in the vehicle longitudinal direction is suppressed by the deformation suppressing portion. Thereby, it is possible to reinforce one of the upper wall and the lower wall of the chamber member with a simple configuration while suppressing an increase in the number of parts.

  The vehicular bumper provided with the pedestrian collision detection device according to claim 3 is the vehicular bumper provided with the pedestrian collision detection device according to claim 1, wherein the deformation suppressing portion is separated from the chamber member. Is formed in a plate shape that is close to the vehicle upper side of the upper wall and the plate thickness direction is arranged in the vehicle vertical direction, and the vehicle longitudinal front inner end portion of the deformation suppressing portion is the bumper reinforcement. It is fixed to.

  In the vehicle bumper provided with the pedestrian collision detection device according to claim 3, the deformation suppressing portion is configured separately from the chamber member. The deformation suppressing portion is formed in a plate shape, and is arranged close to the vehicle upper side of the upper wall and with the plate thickness direction being the vehicle vertical direction, and the vehicle longitudinal front inner end portion of the deformation suppressing portion is a bumper reinforcement. It is fixed to the mentament.

  For this reason, in a collision between a collision body other than a pedestrian and the vehicle (bumper cover), the bumper cover is deformed toward the deformation suppressing portion side and the chamber member side and presses both of them. The wall buckling deformation is suppressed by the deformation suppressing portion. Furthermore, since this collision load acts in a direction substantially orthogonal to the plate thickness direction of the deformation suppressing portion, the collision load on the obliquely lower side with respect to the vehicle front-rear direction is a deformation suppressing portion. The deformation suppressing portion is configured to be difficult to be deformed as compared with the case (when acting on). Thereby, the difference of the deformation amount of the chamber member between when the pedestrian and the vehicle collide and when the collision body other than the pedestrian collides with the vehicle can be increased. As a result, it is possible to satisfactorily identify the collision object with the vehicle.

  And as above-mentioned, the deformation | transformation suppression part is comprised separately from the chamber member. For this reason, the existing chamber member can be used. In addition, for example, the deformation amount of the chamber member can be easily adjusted by appropriately changing the thickness of the deformation suppressing portion.

  The vehicle bumper provided with the pedestrian collision detection device according to claim 4 is the vehicle bumper provided with the pedestrian collision detection device according to claim 3, wherein the deformation suppressing portion extends in the vehicle front-rear direction. A plurality of slit holes are formed, and the slit holes are arranged side by side in the vehicle width direction.

  In the vehicle bumper provided with the pedestrian collision detection device according to claim 4, a plurality of slit holes extending in the vehicle front-rear direction are formed in the deformation suppressing portion, and the plurality of slit holes are arranged in the vehicle width direction. . For this reason, when the bumper cover tilts toward the deformation suppressing portion and presses the deformation suppressing portion in a collision between the pedestrian and the vehicle (bumper cover), the deformation suppressing portion moderates to the vehicle lower side following the inclination of the bumper cover. Bends and deforms. Thereby, compared with the case where a slit hole is abbreviate | omitted in a deformation | transformation suppression part, the deformation amount of the deformation | transformation suppression part at the time of a collision with a pedestrian and a vehicle can be enlarged.

  Further, a portion between the slit holes in the deformation suppressing portion extends in the vehicle front-rear direction. For this reason, even if it provides a slit hole in a deformation | transformation suppression part, the fall of the buckling-proof deformation load of the deformation | transformation suppression part with respect to the load of a vehicle front-back direction can be suppressed. As described above, when the deformation suppressing portion is configured separately from the chamber member, the collision object with the vehicle can be more satisfactorily determined.

  The vehicular bumper provided with the pedestrian collision detecting device according to claim 5 is the vehicular bumper provided with the pedestrian collision detecting device according to claim 3 or 4, wherein an upper surface of the deformation suppressing portion is provided on the upper surface of the deformation suppressing portion. A groove that extends in the vehicle width direction and is open to the upper side of the vehicle is formed.

  In the vehicle bumper provided with the pedestrian collision detection device according to claim 5, a groove portion extending in the vehicle width direction is formed on the upper surface of the deformation suppressing portion. For this reason, when a load obliquely downward with respect to the vehicle front-rear direction acts on the deformation suppressing portion when the pedestrian and the vehicle (bumper cover) collide, the deformation suppressing portion bends and deforms starting from the groove. That is, the deformation suppressing portion can be easily bent and deformed in the groove portion with respect to the collision between the pedestrian and the vehicle.

  On the other hand, when a collision load inward in the vehicle front-rear direction acts on the deformation suppressing portion at the time of a collision between a collision object other than a pedestrian and the vehicle (bumper cover), the collision load is received by a portion excluding the groove portion of the deformation suppressing portion. it can. Thereby, with respect to the collision between the collision body other than the pedestrian and the vehicle, the deformation suppression unit receives the collision load, thereby suppressing the deformation of the chamber member. Therefore, in this case as well, the collision object with the vehicle can be distinguished more satisfactorily.

  A vehicle bumper comprising the pedestrian collision detection device according to claim 6 is the vehicle bumper comprising the pedestrian collision detection device according to any one of claims 3 to 5, wherein the deformation suppression is performed. The position in the vehicle front-rear direction at the outer end in the vehicle front-rear direction of the portion coincides with the vehicle front-rear direction outer side surface of the chamber member, or is set to the vehicle front-rear direction outer side of the chamber member front-rear direction outer side surface.

  In the vehicle bumper provided with the pedestrian collision detection device according to the sixth aspect, the outer end in the vehicle front-rear direction of the deformation suppressing portion is disposed at a position that coincides with the outer front surface in the vehicle front-rear direction of the chamber member. Or the vehicle front-back direction outer side end of a deformation | transformation suppression part protrudes in the vehicle front-back direction outer side rather than the vehicle front-back direction outer side surface of a chamber member. For this reason, it is suppressed that a chamber member deform | transforms ahead of a deformation | transformation suppression part in the collision with collision bodies other than a pedestrian, and a vehicle (bumper cover). Thereby, the deformation amount of the chamber member can be reduced by effectively utilizing the deformation suppressing unit against the collision between the collision body other than the pedestrian and the vehicle.

  According to the vehicle bumper provided with the pedestrian collision detection device according to claim 1, it is possible to satisfactorily discriminate the collision object with the bumper cover.

  According to the vehicle bumper provided with the pedestrian collision detection device according to claim 2, it is possible to reinforce one of the upper wall and the lower wall of the chamber member with a simple configuration while suppressing an increase in the number of parts.

  According to the vehicle bumper provided with the pedestrian collision detection device according to the third aspect, the existing chamber member can be used, and the deformation amount of the chamber member can be easily adjusted.

  According to the vehicle bumper provided with the pedestrian collision detection device according to the fourth aspect, the collision object with the vehicle can be more satisfactorily determined when the deformation suppressing portion is configured separately from the chamber member.

  According to the vehicle bumper provided with the pedestrian collision detection device according to claim 5, when the deformation suppressing portion is configured separately from the chamber member, the collision body with the vehicle can be more satisfactorily distinguished.

  According to the vehicle bumper provided with the pedestrian collision detection device according to claim 6, the deformation suppression unit is effectively used for the collision between the collision body other than the pedestrian and the vehicle, and the deformation amount of the chamber member is reduced. Can be small.

It is a typical sectional side view which shows the schematic structure of the front bumper provided with the collision determination system which concerns on a 1st form. It is a typical sectional side view which shows the state which the front bumper shown by FIG. 1 and the pedestrian collided. It is a typical sectional side view which shows the schematic structure of the front bumper provided with the collision determination system which concerns on a 2nd form. It is a perspective view which shows the collision determination system shown by FIG. It is a perspective view which shows the collision determination system which concerns on a 2nd form.

(First embodiment)

  Hereinafter, the front bumper 12 including the collision determination system 10 according to the first exemplary embodiment will be described with reference to the drawings. 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 FIG. 1, the collision determination system 10 is applied to a front bumper 12 disposed at the front end of a vehicle (automobile) to determine whether or not there is a collision with the front bumper 12. Yes. 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 (not shown) constituting the skeleton member on the vehicle body side. And although illustration is abbreviate | omitted, the vehicle width direction both sides part of bumper R / F14 inclines to the vehicle rear side as it goes to vehicle width direction both sides by planar 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 disposed with the vehicle width direction as a longitudinal direction, and is fixedly attached to the front surface 14A (vehicle front-rear direction outer surface) of the bumper R / F 14. Further, both side portions of the chamber member 16 in the vehicle width direction are inclined toward the vehicle rear side toward the both sides in the vehicle width direction along the bumper R / F 14 in a plan view. 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, a deformation suppressing portion 26 (portion on the vehicle upper side with respect to the two-dot chain line in FIG. 1) is integrally formed on the vehicle upper side of the upper wall 18 of the chamber member 16. In other words, the deformation suppressing portion 26 is integrally formed from the front end portion to the rear end portion of the upper wall 18 of the chamber member 16 in a side view, and the thickness dimension of the upper wall 18 is equal to the front wall of the chamber member 16. 20, the thickness of the lower wall 22 and the rear wall 24 is set larger than the thickness dimension. Thereby, it is comprised so that the buckling load of the upper wall 18 may be suppressed with respect to the load of the vehicle front-back direction. That is, the deformation load of the upper wall 18 with respect to the load in the vehicle longitudinal direction is set larger than the deformation load of the lower wall 22 with respect to the load in the vehicle longitudinal direction. In addition, the thickness dimension of each of the front wall 20, the lower wall 22, and the rear wall 24 of the chamber member 16 is set to be the same.

  The chamber member 16 has a 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 is communicated with the atmosphere at a position not shown. It has a communication hole. Therefore, normally (statically), the pressure chamber 28 which is the internal space of the chamber member 16 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.

  Furthermore, the collision determination system 10 includes a pressure sensor 30, and the pressure sensor 30 is electrically connected to an ECU 32 as a collision determination unit. The pressure sensor 30 outputs a signal corresponding to the pressure in the pressure chamber 28 to the ECU 32, and the ECU 32 calculates the collision load based on the output signal of the pressure sensor 30. The ECU 32 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 object to the ECU 32, and the ECU 32 calculates the collision speed based on the output signal of the collision speed sensor. Then, the ECU 32 obtains the effective mass of the collision object from the calculated collision load and collision speed, determines whether the effective mass exceeds the 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 34 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 34 is made of a foamed resin material, that is, urethane foam or the like. The absorber 34 is formed in a long shape with the vehicle width direction as a longitudinal direction, and is formed in a substantially C shape that is open to the rear side of the vehicle in a side sectional view. The absorber 34 is disposed along the bumper R / F 14 in plan view, and is fixed (contacted) to the front surface 14A of the bumper R / F 14 at the rear end. Further, a gap G <b> 1 is formed between the lower surface of the lower wall 22 of the chamber member 16 and the upper surface of the absorber 34. The gap G1 is formed so that the lower wall 22 of the chamber member 16 does not interfere with the absorber 34 when the bumper cover 36 described later presses the chamber member 16 and the chamber member 16 is deformed.

  The front bumper 12 includes a bumper cover 36 made of a resin material or the like. The bumper cover 36 is disposed on the vehicle front side of the chamber member 16 and the absorber 34 so as to face both of them, and is fixedly supported to the vehicle body at a portion not shown. A gap G <b> 2 is formed between the bumper cover 36 and the chamber member 16. That is, the absorber 34 is not interposed between the bumper cover 36 and the chamber member 16, and the bumper cover 36 is deformed and the chamber is deformed in a collision between a collision object such as a pedestrian and the vehicle (bumper cover 36). It is comprised so that the member 16 may be pressed. Then, both side portions of the bumper cover 36 in the vehicle width direction are inclined toward the vehicle rear side toward the both sides in the vehicle width direction in plan view. Thereby, the dimension in the vehicle front-rear direction of the gap G2 at the vehicle width direction center of the front bumper 12 is set wider than the dimension in the vehicle front-rear direction of the gap G2 at both ends in the vehicle width direction of the front bumper 12.

  Furthermore, an extension 38 constituting the design of the vehicle is assembled on the front side of the bumper cover 36, and the bumper cover 36 is covered with the extension 38 from the front side of the vehicle. The extension 38 may be omitted.

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

  In the front bumper 12 including the collision determination system 10 configured as described above, the absorber 34 is provided on the vehicle lower side of the chamber member 16, and the bumper cover 36 is provided on the vehicle front side of the chamber member 16 and the absorber 34. It has been.

  In a collision between the pedestrian and the vehicle (bumper cover 36), the pedestrian falls over the hood of the vehicle, so that a collision load mainly acts on the bumper cover 36 obliquely downward from the rear of the vehicle. (See arrow A in FIG. 2). For this reason, the bumper cover 36 is deformed so as to fall down toward the chamber member 16 and presses the chamber member 16. As a result, a collision load on the rear lower side of the vehicle acts on the chamber member 16 to deform the chamber member 16 and change the pressure in the pressure chamber 28.

  Further, the pressure sensor 30 outputs a signal corresponding to the pressure in the pressure chamber 28 to the ECU 32, and the ECU 32 calculates the collision load based on the output signal of the pressure sensor 30. Further, the ECU 32 calculates the collision speed based on the output signal of the collision speed sensor. Thus, the ECU 32 obtains the effective mass of the collision object from the calculated collision load and collision velocity, determines whether the effective mass exceeds the threshold value, and the collision object 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 a vehicle (bumper cover 36), the collision body enters substantially horizontally with respect to the bumper cover 36. Therefore, a collision load mainly on the rear side of the vehicle is applied to the bumper cover 36. Works. For this reason, the bumper cover 36 is deformed to the chamber member 16 side (vehicle rear side) and presses the chamber member 16 and the absorber 34 substantially horizontally. As a result, a collision load to the rear side of the vehicle acts on the chamber member 16 and the absorber 34, the chamber member 16 and the absorber 34 are deformed, and the pressure in the pressure chamber 28 changes.

  Here, a deformation suppressing portion 26 is integrally provided on the upper wall 18 of the chamber member 16, and the plate thickness dimension of the upper wall 18 is set larger than the plate thickness dimension of the lower wall 22. That is, the upper wall 18 is reinforced by the deformation suppressing unit 26, and the buckling deformation of the upper wall 18 is suppressed by the deformation suppressing unit 26 with respect to the load in the vehicle longitudinal direction.

  When a collision load on the diagonally lower rear side of the vehicle acts on the chamber member 16 at the time of a collision between the pedestrian and the vehicle (bumper cover 36), the upper wall 18 is deformed so as to fall down on the lower side of the vehicle, and the front wall 20 The entire chamber member 16 is deformed so that the lower wall 22 is folded (see FIG. 2). Thereby, compared with the case where the deformation | transformation suppression part 26 is abbreviate | omitted in the upper wall 18 (when the thickness dimension of the upper wall 18 is set equal to the thickness dimension of the lower wall 22), the chamber member 16 of FIG. The amount of deformation can be made comparable.

  On the other hand, if a collision load on the rear side of the vehicle acts on the chamber member 16 when a collision object other than a pedestrian collides with the vehicle (bumper cover 36), the upper wall 18 and the lower wall 22 of the chamber member 16 will buckle and deform. And However, as described above, since the upper wall 18 is reinforced by the deformation suppressing portion 26 and the buckling deformation of the upper wall 18 is suppressed by the deformation suppressing portion 26 with respect to the vehicle longitudinal direction load, Buckling deformation is suppressed. Thereby, compared with the case where the deformation | transformation suppression part 26 is abbreviate | omitted in the upper wall 18, the deformation amount of the chamber member 16 can be made small. Therefore, the difference in the deformation amount of the chamber member 16 between the case where the pedestrian and the vehicle collide and the case where the collision body other than the pedestrian collides with the vehicle becomes large, and is output from the pressure sensor 30 to the ECU 32. The difference in output value increases. As a result, it is possible to satisfactorily identify the collision object with the vehicle.

  Further, as described above, the deformation suppressing portion 26 is integrally provided on the upper wall 18 of the chamber member 16. For this reason, the upper wall 18 can be reinforced with a simple configuration while suppressing an increase in the number of parts.

  In the first embodiment, the deformation suppressing portion 26 is integrally provided on the upper wall 18 of the chamber member 16. Instead, the deformation suppressing portion 26 is integrally provided on the lower wall 22 of the chamber member 16, and the thickness dimension of the lower wall 22 is compared with the thickness dimension of the upper wall 18, the front wall 20, and the rear wall 24. You may set large.

  Even in this case, when a collision load on the diagonally lower rear side of the vehicle acts on the chamber member 16 at the time of collision between the pedestrian and the vehicle (bumper cover 36), the upper wall 18 is deformed so as to fall down on the lower side of the vehicle, The entire chamber member 16 is deformed so that the front wall 20 and the lower wall 22 are folded. Thereby, the deformation amount of the chamber member 16 can be made to be the same as the deformation amount of the chamber member when the deformation suppressing portion 26 is omitted in the lower wall 22.

  On the other hand, if a collision load on the rear side of the vehicle acts on the chamber member 16 when a collision object other than a pedestrian collides with the vehicle (bumper cover 36), the upper wall 18 and the lower wall 22 of the chamber member 16 will buckle and deform. However, the buckling deformation in the lower wall 22 is suppressed by the deformation suppressing unit 26. Thereby, compared with the case where the deformation | transformation suppression part 26 is abbreviate | omitted in the lower wall 22, the deformation amount of the chamber member 16 can be made small. Therefore, the difference in the deformation amount of the chamber member 16 between the case where the pedestrian and the vehicle collide and the case where the collision body other than the pedestrian collides with the vehicle becomes large, and is output from the pressure sensor 30 to the ECU 32. The difference in output value increases. As a result, it is possible to satisfactorily identify the collision object with the vehicle.

  Further, in the first embodiment, the deformation suppressing portion 26 is integrally formed on the entire upper wall 18 of the chamber member 16, and the thickness of the entire upper wall 18 is larger than the thickness of the entire lower wall 22. It is set large. Alternatively, the deformation suppressing part 26 may be formed in a plurality of ribs extending in the vehicle front-rear direction, and the rib-shaped deformation suppressing part 26 may be formed integrally with the upper wall 18 or the lower wall 22. Even in this case, the buckling deformation of the upper wall 18 or the lower wall 22 can be suppressed with respect to the vehicle longitudinal load.

(Second Embodiment)

  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, as shown in FIGS. 3 and 4, in the second embodiment, the deformation suppressing portion 26 in the upper wall 18 of the chamber member 16 is omitted, and the upper wall 18, the front wall 20, and the lower wall 22 are omitted. And the thickness dimension of each of the rear wall 24 is set to the same dimension.

  Further, a reinforcing plate 102 as a deformation suppressing portion is provided close to the vehicle upper side of the chamber member 16. That is, the reinforcing plate 102 is configured as a member separate from the chamber member 16. The reinforcing plate 102 is formed in a substantially long plate shape, and is arranged with the longitudinal direction in the vehicle width direction and the plate thickness direction in the vehicle vertical direction, and between the reinforcing plate 102 and the upper wall 18. A gap G3 is formed.

  And the rear-end part of the reinforcement plate 102 is arrange | positioned at the vehicle upper side of bumper R / F14, and is being fixed to the upper end part of bumper R / F14 with fastening members, such as the volt | bolt 110. Thereby, the reinforcing plate 102 protrudes from the bumper R / F 14 to the front side of the vehicle in a side view.

  The reinforcing plate 102 has a plurality of slit holes 104 formed therethrough. The slit hole 104 extends in the vehicle front-rear direction and is arranged side by side in the vehicle width direction. Further, the position of the front end 102 </ b> A of the reinforcing plate 102 in the vehicle front-rear direction coincides with the front surface 20 </ b> A of the (front wall 20) of the chamber member 16.

  In a collision between the pedestrian and the vehicle (bumper cover 36), the bumper cover 36 is deformed so as to fall toward the reinforcing plate 102 and the chamber member 16 and presses the front end portion of the reinforcing plate 102. As a result, a collision load to the rear lower side of the vehicle acts on the front end portion of the reinforcing plate 102, and the reinforcing plate 102 is bent and deformed downward. Then, the reinforcing plate 102 presses the chamber member 16 and the chamber member 16 is deformed.

  On the other hand, in a collision between a collision body other than a pedestrian and a vehicle (bumper cover 36), the bumper cover 36 is deformed toward the reinforcing plate 102 and the chamber member 16 so that the front end 102A and the chamber member 16 of the reinforcing plate 102 are substantially omitted. Press horizontally. For this reason, buckling deformation of the upper wall 18 is suppressed by the reinforcing plate 102 with respect to the load on the rear side of the vehicle. Since this collision load acts in a direction substantially orthogonal to the thickness direction of the reinforcing plate 102, a collision load between the pedestrian and the vehicle (the collision load on the diagonally lower rear side of the vehicle is applied to the front end of the reinforcing plate 102). The reinforcing plate 102 is configured to be less likely to be deformed than when it is applied. Thereby, the difference of the deformation amount of the chamber member 16 when the pedestrian and the vehicle collide and when the collision body other than the pedestrian collides with the vehicle can be increased. As a result, it is possible to satisfactorily identify the collision object with the vehicle.

  A plurality of slit holes 104 extending in the vehicle front-rear direction are formed in the reinforcing plate 102, and the slit holes 104 are arranged in the vehicle width direction. For this reason, when the bumper cover 36 tilts toward the reinforcing plate 102 and presses the reinforcing plate 102 when the pedestrian collides with the vehicle (bumper cover 36), the reinforcing plate 102 follows the tilt of the bumper cover 36 and the bottom of the vehicle. It bends and deforms moderately to the side. Thereby, compared with the case where the slit hole 104 is abbreviate | omitted in the reinforcement plate 102, the deformation amount of the reinforcement plate 102 at the time of a collision with a pedestrian and a vehicle can be enlarged.

  Furthermore, the part between each slit hole 104 in the reinforcement plate 102 is extended in the vehicle front-back direction. For this reason, even if the slit hole 104 is provided in the reinforcing plate 102, it is possible to suppress a decrease in the buckling deformation load of the reinforcing plate 102 with respect to the load in the vehicle longitudinal direction. As described above, when the reinforcing plate 102 and the chamber member are configured separately, the collision object with the vehicle can be distinguished more satisfactorily.

  Further, the position of the front end 102 </ b> A of the reinforcing plate 102 in the vehicle front-rear direction coincides with the front surface 20 </ b> A of the chamber member 16. For this reason, the bumper cover 36 presses the reinforcing plate 102 and the chamber member 16 substantially simultaneously in the collision between the collision object other than the pedestrian and the vehicle (bumper cover 36). Accordingly, since the chamber member 16 is prevented from being deformed before the reinforcing plate 102, the reinforcing plate 102 is effectively used against a collision between a collision body other than a pedestrian and a vehicle. The amount of deformation can be reduced.

  In the second embodiment, a slit hole 104 extending in the vehicle front-rear direction is formed through the reinforcing plate 102. However, the slit hole 104 may be formed so as to open to the vehicle front side or the vehicle rear side. Good.

(Third embodiment)

  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 100 according to the second 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 100 which concerns on 2nd Embodiment.

  That is, as shown in FIG. 5, the slit hole 104 of the reinforcing plate 102 is omitted in the third embodiment. Further, a groove portion 202 opened to the upper side of the vehicle is formed on the upper surface of the reinforcing plate 102. The groove 202 has a substantially V-shaped cross section and extends along the vehicle width direction. Furthermore, the groove part 202 is arrange | positioned at the vehicle front side of bumper R / F14 by planar view.

  In the collision between the pedestrian and the vehicle (bumper cover 36), as in the second embodiment, the bumper cover 36 is deformed so as to fall down to the reinforcing plate 102 side and the chamber member 16 side, and the reinforcing plate The front end of 102 is pressed. As a result, the collision load obliquely downward on the rear side of the vehicle acts on the front end portion of the reinforcing plate 102, and the reinforcing plate 102 is bent and deformed downward from the groove portion 202. That is, the reinforcing plate 102 can be easily bent and deformed in the groove portion 202 against a collision between the pedestrian and the vehicle.

  On the other hand, in a collision between a collision object other than a pedestrian and a vehicle (bumper cover 36), the bumper cover 36 is deformed to the reinforcing plate 102 side and the chamber member 16 side to reinforce as in the second embodiment. The front end 102A of the plate 102 and the chamber member 16 are pressed substantially horizontally. For this reason, a collision load to the rear side of the vehicle acts on the reinforcing plate 102 and the chamber member 16. When a collision load to the rear side of the vehicle acts on the reinforcing plate 102, the collision load can be received by a portion of the reinforcing plate 102 excluding the groove 202. Thereby, with respect to the collision between the collision body other than the pedestrian and the vehicle, the deformation of the chamber member 16 is suppressed by the reinforcement plate 102 receiving the collision load. Therefore, also in the third embodiment, the difference in deformation amount of the chamber member 16 between the case where the pedestrian and the vehicle collide and the case where the collision body other than the pedestrian collides with the vehicle can be increased. As a result, it is possible to satisfactorily identify the collision object with the vehicle.

  In the third embodiment, the cross-sectional shape of the groove 202 is formed in a V shape, but the cross-sectional shape of the groove 202 is not limited to this. For example, the cross-sectional shape of the groove 202 may be formed in a semicircular shape opened to the upper side of the vehicle.

  Further, in the second embodiment and the third embodiment, the position of the front end 102 </ b> A of the reinforcing plate 102 in the front-rear direction of the vehicle coincides with the front surface 20 </ b> A of the chamber member 16. Instead, the front end 102 </ b> A of the reinforcing plate 102 may be disposed on the vehicle front side with respect to the front surface 20 </ b> A of the chamber member 16. In this case, the bumper cover 36 presses the reinforcing plate 102 before the chamber member 16 in the collision between the collision body other than the pedestrian and the vehicle (bumper cover 36). Accordingly, even in this case, the chamber member 16 is prevented from being deformed before the reinforcing plate 102, so that the reinforcing plate 102 is effectively used against a collision between a collision object other than a pedestrian and a vehicle. The deformation amount of the chamber member 16 can be reduced.

  In the second embodiment and the third embodiment, the gap G3 is formed between the reinforcing plate 102 and the chamber member 16, but the lower surface of the reinforcing plate 102 and the upper wall of the chamber member 16 are formed. The reinforcing plate 102 may be arranged so that the upper surface of 18 comes into contact with the upper surface.

  Further, in the first to third embodiments, the absorber 34 is not interposed between the bumper cover 36 and the chamber member 16, and a collision object such as a pedestrian and the vehicle (bumper cover 36). The bumper cover 36 is configured to press the chamber member 16 at the time of a collision. Instead, a spacer part formed integrally with the absorber 34 is disposed between the bumper cover 36 and the chamber member 16 so that the bumper cover 36 presses the chamber member 16 through the spacer part. It may be configured. In this case, the upper end of the spacer portion is disposed on the vehicle upper side than the upper wall of the chamber member 16.

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.

Furthermore, you may combine 2nd Embodiment and 3rd Embodiment. That is, a plurality of slit holes 104 and groove portions 202 may be formed in the reinforcing plate 102.

10 Collision determination system (pedestrian collision detection device)
12 Front bumper (vehicle bumper)
14 Bumper R / F (Bumper reinforcement)
16 Chamber member 18 Upper wall 20 Front wall 20A Front surface (vehicle front-rear direction outer surface)
26 Deformation suppression unit 28 Pressure chamber 30 Pressure sensor 34 Absorber 36 Bumper cover 100 Collision determination system (pedestrian collision detection device)
102A front end (vehicle front-rear direction outer end)
102 Reinforcement plate (deformation suppression part)
104 slit hole 200 collision determination system (pedestrian collision detection device)
202 Groove

Claims (6)

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
A deformation suppressing portion that is provided near one of the upper wall and the lower wall of the chamber member or in the vicinity thereof, and suppresses buckling deformation of one of the upper wall and the lower wall with respect to a load in the vehicle longitudinal direction;
Bumper for vehicles provided with a pedestrian collision detection device. The deformation suppressing portion is integrally provided on one of the upper wall and the lower wall;
The vehicular bumper provided with the pedestrian collision detection device according to claim 1, wherein a thickness dimension of one of the upper wall and the lower wall is set larger than a thickness dimension of the other of the upper wall and the lower wall. .   The deformation suppression unit is formed in a plate shape that is formed separately from the chamber member, and is disposed close to the vehicle upper side of the upper wall and with the plate thickness direction being the vehicle vertical direction, and the deformation suppression unit The vehicle bumper provided with the pedestrian collision detection device according to claim 1, wherein an inner end portion in the vehicle front-rear direction is fixed to the bumper reinforcement.   The vehicle including the pedestrian collision detection device according to claim 3, wherein the deformation suppressing portion includes a plurality of slit holes extending in the vehicle front-rear direction, and the slit holes are arranged side by side in the vehicle width direction. For bumpers.   The bumper for vehicles provided with the pedestrian collision detection apparatus of Claim 3 or Claim 4 in which the groove part extended in the vehicle width direction and opened to the vehicle upper side was formed in the upper surface of the said deformation | transformation suppression part.   A position in the vehicle front-rear direction at the vehicle front-rear direction outer end of the deformation suppressing portion is set to be coincident with a vehicle front-rear direction outer side surface of the chamber member or set to a vehicle front-rear direction outer side with respect to the vehicle front-rear direction outer surface of the chamber member. A vehicle bumper comprising the pedestrian collision detection device according to any one of claims 3 to 5.

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