JP2015131508A - Bumper structure for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bumper structure for a vehicle capable of reliably detecting a collision with a pedestrian, while securing performance of protecting legs of the pedestrian.SOLUTION: A front bumper 12 having a bumper structure S1 for a vehicle has a pressure tube 18 that is disposed on a vehicle's lower side and a vehicle's front side of a bumper reinforcement 14, along a vehicle width direction, the pressure tube 18 producing output changing when pressed. The front bumper 12 has an absorber 20 on the vehicle's front side of the bumper reinforcement 14, and the pressure tube 18 is disposed between the bumper reinforcement 14 and the absorber 20. At a lower side of the absorber 20, there is formed a protrusion 24 a front surface of which protrudes from a general surface 20B toward the vehicle's front side. At a part, above the pressure tube 18, of the absorber 20, there is formed an inclined part 26 cut out to a vehicle's lower side so that the length in a vehicle vertical direction becomes shorter from a top surface 20C toward a vehicle's rear side, in a vehicle's side sectional view.

Description

  The present invention relates to a vehicle bumper structure.

  Patent Document 1 below discloses a structure in which a pressure tube is disposed between a front surface of a bumper reinforcement and a foamed resin absorber along the vehicle width direction, and pressure sensors are connected to both ends of the pressure tube in the vehicle width direction. Has been. In this structure, a collision with a pedestrian is determined by detecting a pressure change accompanying a deformation of the pressure tube by a pressure sensor at the time of collision between the pedestrian and the vehicle. In addition, there exists a thing described in patent document 2, 3 as a structure provided with the pedestrian collision detection sensor.

International Publication No. 2012/113362 JP 2007-216804 A JP 2007-118830 A

  In the structure described in Patent Document 1, the absorber needs to be arranged as far down in the vertical direction of the vehicle as possible when considering the protection of pedestrian legs during a vehicle collision. Therefore, since the center of gravity of the pedestrian is positioned above the vertical direction of the vehicle with respect to the pressure tube, the rotation mode is such that the pedestrian falls on the hood at the time of collision, and the load is difficult to transmit to the pressure tube. On the other hand, if the absorber is weakened, the sensitivity of the pressure sensor increases, and it is conceivable that an output is generated even on a roadside marker such as a roadside marker that is not desired to be detected, and the pressure sensor detects a collision.

  In view of the above fact, an object of the present invention is to provide a vehicular bumper structure capable of more reliably detecting a collision with a pedestrian while securing a pedestrian's leg protection performance.

  A bumper structure for a vehicle according to a first aspect of the present invention is provided on a lower side in a vehicle vertical direction of a bumper reinforcement extending along a vehicle width direction, and in a vehicle width direction on a vehicle front side of the bumper reinforcement. The pedestrian collision detection sensor, which is disposed along the pedestrian collision detection sensor whose output changes when pressed, and the bumper reinforcement is disposed on the vehicle front side, and the pedestrian collision detection sensor is interposed between the bumper reinforcement. An absorber arranged in a state where the absorber is disposed, a protrusion formed on a lower side of the vehicle in the vertical direction of the vehicle, and a front surface of the vehicle in the front-rear direction protruding from the general surface to the vehicle front side, and the pedestrian collision detection sensor in the absorber It is formed on the upper side in the vertical direction of the vehicle, and from the upper surface in the vertical direction of the vehicle to the rear side of the vehicle in a sectional view of the vehicle Having a notched cutout portion of the vehicle lower side to be shorter in length in the vehicle vertical direction Te.

  According to a second aspect of the present invention, in the vehicular bumper structure according to the first aspect, the vehicle is disposed in a boundary region between the protrusion and the general surface of the absorber along the vehicle width direction and is concave on the vehicle rear side. A recessed portion that is recessed is formed.

  According to a third aspect of the present invention, in the vehicle bumper structure according to the second aspect, the bumper cover disposed on the vehicle front side of the absorber is a bumper corner portion on the vehicle width direction outer side, and the vehicle is viewed from the vehicle side sectional view. The concave portion is provided in the absorber at the bumper corner portion, and the general surface above the vehicle in the absorber is the shape of the bumper cover. And the vehicle is inclined so as to have an upward slope toward the rear side of the vehicle.

  According to a fourth aspect of the present invention, in the vehicle bumper structure according to any one of the first to third aspects, regions having different hardness are set in a part of the absorber.

  According to a fifth aspect of the present invention, in the vehicle bumper structure according to the fourth aspect, a portion having a different expansion ratio is provided in a part of the absorber.

  A sixth aspect of the present invention is the vehicle bumper structure according to the fourth or fifth aspect, wherein the absorber is provided with a hard portion along the vehicle front-rear direction on the vehicle lower side of the pedestrian collision detection sensor. ing.

  A seventh aspect of the invention is the vehicle bumper structure according to the fourth or fifth aspect, wherein the absorber is provided with a hard portion on the vehicle front side of the pedestrian collision detection sensor.

  According to the first aspect of the present invention, a pedestrian along the vehicle width direction on the vehicle front side of the bumper reinforcement is disposed on the lower side in the vehicle vertical direction of the bumper reinforcement extending along the vehicle width direction. A collision detection sensor is arranged. An absorber is provided on the vehicle front side of the bumper reinforcement, and a pedestrian collision detection sensor is interposed between the absorber and the bumper reinforcement. The absorber is provided with a protrusion on the lower side in the vertical direction of the vehicle, the front of the vehicle in the front-rear direction protruding from the general surface to the front side of the vehicle. In this structure, since the protrusion is formed on the lower side of the absorber, the pedestrian's leg protection performance can be ensured.

  Further, the absorber has a length in the vehicle vertical direction that is shorter in the vehicle vertical direction from the upper surface in the vehicle vertical direction to the vehicle rear side in the vehicle side sectional view than the pedestrian collision detection sensor. A cutout portion cut out on the vehicle lower side is provided. As a result, when the pedestrian falls to the hood at the time of a collision with the vehicle, the load is transmitted in a direction along the notch portion of the absorber, thereby transmitting the load more reliably to the pedestrian collision detection sensor. be able to. For this reason, the collision with a pedestrian can be detected more reliably by the pedestrian collision detection sensor whose output changes when pressed. In addition, when a road obstacle such as a roadside marker collides with the vehicle, the transmission of the load to the pedestrian collision detection sensor can be reduced by pushing down the road obstacle with a protrusion on the lower side of the absorber. For this reason, it can suppress that a collision is detected by the pedestrian collision detection sensor at the time of a collision with the obstacle on a road.

  According to the second aspect of the present invention, the concave portion that is disposed along the vehicle width direction and is recessed in the vehicle rear side is formed in the boundary region between the protrusion and the general surface of the absorber. Thereby, at the time of a collision with a pedestrian and a vehicle, a load is received in the upper part side from the concave part of an absorber, and a load is transmitted to a collision detection sensor. In addition, when a road obstacle collides with a vehicle, a load is received below the concave portion of the absorber, so that the load is not easily transmitted to the pedestrian collision detection sensor. For this reason, discrimination of a pedestrian and an obstacle on a road by a pedestrian collision detection sensor becomes more reliable.

  According to the third aspect of the present invention, the bumper cover on the vehicle front side of the absorber is curved at the bumper corner portion toward the vehicle rear side and the vehicle upper side in the vehicle side sectional view. Further, in the bumper corner portion, the absorber is provided with a concave portion, and the general surface above the vehicle in the absorber is inclined so as to be inclined upward toward the vehicle rear side along the shape of the bumper cover. Yes. As a result, it is possible to receive a load on the general surface side of the absorber at the time of a collision with a pedestrian, and to receive a load on the lower side from the concave portion of the absorber at the time of a collision with an obstacle on the road. It is possible to improve the collision discrimination performance of road obstacles.

  According to the fourth aspect of the present invention, regions having different hardness are set in a part of the absorber. Thereby, it becomes possible to transmit a load to a collision detection sensor more effectively with a simple configuration.

  According to the fifth aspect of the present invention, a part having a different expansion ratio is provided in a part of the absorber. Accordingly, it is possible to transmit the load to the collision detection sensor more effectively with a simple configuration, and it is possible to easily manufacture the absorber.

  According to the sixth aspect of the present invention, the absorber is provided with a hard portion along the vehicle front-rear direction on the vehicle lower side of the pedestrian collision detection sensor. As a result, the load transmission range can be divided between the upper part of the absorber and the lower part of the hard part.

  According to the seventh aspect of the present invention, the absorber is provided with a hard portion on the vehicle front side of the pedestrian collision detection sensor. Thereby, at the time of a collision with a pedestrian and a vehicle, a pedestrian collision detection sensor can be pressed in the hard part of an absorber.

  As described above, the vehicular bumper structure according to the first aspect of the present invention is excellent in that it can detect a collision with a pedestrian more reliably while ensuring the leg protection performance of the pedestrian. Has an effect.

  The vehicular bumper structure according to the second aspect of the present invention has an excellent effect that the collision discrimination performance by the pedestrian collision detection sensor can be improved.

  The bumper structure for a vehicle according to the third aspect of the present invention has an excellent effect that the collision determination performance by the pedestrian collision detection sensor can be improved at the bumper corner portion.

  The vehicle bumper structure according to the fourth aspect of the present invention has an excellent effect that a load can be more effectively transmitted to the collision detection sensor with a simple configuration.

  The vehicle bumper structure according to the fifth aspect of the present invention has an excellent effect that the load can be more effectively transmitted to the collision detection sensor with a simple configuration and the manufacture is easy.

  The vehicle bumper structure according to the sixth aspect of the present invention has an excellent effect that the load transmission range can be divided between the upper side and the lower side of the hard part of the absorber.

  The vehicle bumper structure according to the seventh aspect of the present invention has an excellent effect that the pedestrian collision detection sensor can be pressed at a hard part of the absorber.

It is a sectional side view which shows the vehicle width direction center part of the front part of the vehicle to which the bumper structure for vehicles which concerns on 1st Embodiment was applied. It is a sectional side view which shows typically the state which the front bumper shown in FIG. 1 collided with the collision body which simulated the leg part of the pedestrian. It is a sectional side view which shows typically the state which the front bumper shown in FIG. 1 collided with the obstacle on the road. It is a perspective view which shows the absorber used for the bumper structure for vehicles which concerns on 2nd Embodiment. It is a sectional side view which shows the bumper corner part of the front part of the vehicle to which the bumper structure for vehicles which concerns on 3rd Embodiment was applied. It is a sectional side view shown in the state which expanded some bumper structures for vehicles concerning a 4th embodiment. It is a sectional side view shown in the state which expanded some bumper structures for vehicles concerning 5th Embodiment. It is a sectional side view shown in the state which expanded some bumper structures for vehicles concerning a 6th embodiment. It is a sectional side view shown in the state which expanded a part of bumper structure for vehicles concerning 7th Embodiment. It is a sectional side view shown in the state which expanded some bumper structures for vehicles concerning 8th Embodiment. (A) is a side sectional view schematically showing a state in which a front bumper to which a vehicular bumper structure according to a comparative example is applied collides with a collision body that simulates a pedestrian's leg, and (B) It is a sectional side view showing typically the state where the front bumper to which the bumper structure for vehicles concerning a comparative example was applied collided with the obstacle on the road.

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

  FIG. 1 is a side sectional view showing a vehicle width direction central portion of a front portion of a vehicle to which the vehicle bumper structure according to the present embodiment is applied. As shown in this figure, a front bumper 12 to which the vehicle bumper structure S1 of the present embodiment is applied is provided at the front of a vehicle 10 of an automobile.

  The front bumper 12 includes a bumper reinforcement 14 which is a bumper skeleton member. The bumper reinforcement 14 is made of, for example, a metal material such as iron or aluminum, and is configured as a skeleton member that extends along the vehicle width direction. The bumper reinforcement 14 is bridged between the front end portions of a pair of left and right front side members (not shown) constituting the skeleton member on the vehicle body side. Moreover, although illustration is abbreviate | omitted, the vehicle width direction both sides part of the bumper reinforcement 14 is inclined to the vehicle rear side as it goes to the vehicle width direction both sides by planar view.

  The front bumper 12 includes a pressure tube 18 as a pedestrian collision detection sensor disposed on the vehicle front side of the bumper reinforcement 14. The front bumper 12 includes an absorber 20 disposed on the vehicle front side of the bumper reinforcement 14, and a pressure tube 18 is interposed between the absorber 20 and the bumper reinforcement 14.

  The pressure tube 18 is provided on the lower side in the vehicle vertical direction of the front surface 14A of the bumper reinforcement 14 (a position corresponding to a part of the lower half portion). The pressure tube 18 has a substantially long shape and is arranged with the vehicle width direction as a longitudinal direction. The pressure tube 18 is formed of a resin material and is configured as a hollow structure having a substantially cylindrical cross section. The pressure tube 18 can be crushed and deformed by pressing from the outside.

  A groove 22 that is recessed toward the front side of the vehicle is formed on the rear surface portion 20A of the rear side of the absorber 20 in the vehicle front-rear direction. The groove portion 22 of the absorber 20 is disposed substantially along the vehicle width direction. With the pressure tube 18 inserted in the groove portion 22 of the absorber 20, the rear surface portion 20 </ b> A of the absorber 20 is attached to the front surface 14 </ b> A of the bumper reinforcement 14. Although not shown, in the present embodiment, the protrusions provided at both ends of the rear surface portion 20A of the absorber 20 in the vehicle width direction are recessed portions provided at both ends of the front surface 14A of the bumper reinforcement 14 in the vehicle width direction. By being engaged, the rear surface portion 20 </ b> A of the absorber 20 is fixed in contact with the front surface 14 </ b> A of the bumper reinforcement 14. In addition, the attachment structure to the bumper reinforcement 14 of the absorber 20 is not limited to this, It can change.

  A pressure sensor (not shown) constituting a part of the pedestrian collision detection sensor is connected to both ends of the pressure tube 18 in the vehicle width direction. When the pressure tube 18 is deformed by pressing, a signal corresponding to a pressure change in the pressure tube 18 is output from the pressure sensor to an ECU (not shown) as a collision determination unit. The ECU calculates the collision load based on the output signal of the pressure sensor. Further, a collision speed sensor (not shown) is electrically connected to the ECU. The collision speed sensor outputs a signal corresponding to the collision speed with the colliding body to the ECU, and the ECU calculates the collision speed based on the output signal of the collision speed sensor. Then, the ECU obtains the effective mass of the collision object from the calculated collision load and collision velocity, determines whether the effective mass exceeds a threshold value, and determines whether the collision object to the front bumper 12 is a pedestrian. It is determined whether the obstacle is on the road (for example, a roadside marker or a post cone). In this embodiment, the case where the effective mass exceeds the threshold value and the collision object is determined to be a pedestrian is expressed as “the pressure sensor is turned on” for convenience. The case where the effective mass does not exceed the threshold value is expressed as “the pressure sensor is turned off” for convenience.

  The absorber 20 is formed with a protrusion 24 whose front surface in the vehicle front-rear direction protrudes from the general surface 20B toward the vehicle front side on the lower side in the vehicle vertical direction. Here, the general surface 20 </ b> B is a portion that constitutes a main portion on the upper side from the vehicle vertical direction intermediate portion on the front surface of the absorber 20. The absorber 20 has a configuration in which a difference in the front-rear direction is provided between the general surface 20B and the front surface of the protrusion 24 in a vehicle side sectional view. The protrusion 24 is provided in the vehicle vertical direction lower than the position of the pressure tube 18 (position of the groove 22) in the vehicle side sectional view.

  Further, the absorber 20 has a length in the vehicle vertical direction that is shorter from the upper surface 20C in the vehicle vertical direction toward the vehicle rear side in a vehicle side sectional view than the pressure tube 18 in the upper side in the vehicle vertical direction. An inclined portion 26 is formed as a cutout portion cut out on the vehicle lower side. In other words, the inclined portion 26 is formed such that the length from the lower surface 20D of the absorber 20 to the upper end gradually decreases from the upper surface 20C of the front portion of the absorber 20 toward the vehicle rear side. In the present embodiment, the lower surface 20D of the absorber 20 is disposed substantially horizontally in the vehicle front-rear direction (slightly inclined obliquely downward to the rear of the vehicle), and the position (height) of the upper end portion of the absorber 20 is It has changed. More specifically, the inclined portion 26 is an inclined surface inclined obliquely downward from the upper surface 20C of the front portion of the absorber 20 toward the vehicle rear side.

  The rear end portion of the inclined portion 26 of the absorber 20 extends near the rear surface portion 20 </ b> A on the upper side of the groove portion 22. Thereby, the contact area of the rear surface portion 20 </ b> A of the absorber 20 with the front surface 14 </ b> A of the bumper reinforcement 14 is configured such that the lower side of the pressure tube 18 is larger than the upper side of the pressure tube 18. The absorber 20 is formed of a foamed resin material, and for example, urethane foam or the like is used.

  By providing a protrusion 24 projecting forward of the vehicle on the lower side of the absorber 20, a load is received at the lower portion of the absorber 20 when it collides with a pedestrian's leg or an obstacle on the road. Further, when the pedestrian falls into the hood side of the vehicle 10 at the time of collision between the pedestrian and the vehicle 10, pressure is received by receiving a load obliquely downward along the inclined portion 26 on the upper side of the absorber 20. The tube 18 is crushed (see FIG. 2).

  The front bumper 12 includes a bumper cover 30 on the vehicle front side of the absorber 20. The bumper cover 30 is disposed substantially along the vehicle vertical direction at the center in the vehicle width direction. The bumper cover 30 is disposed so as to be opposed to the absorber 20 with a gap between them when viewed from the side of the vehicle, and is fixedly supported to the vehicle body at a portion not shown. The bumper cover 30 has a shape protruding toward the vehicle front side in the vicinity of the position where the protrusion 24 of the absorber 20 is provided. Although not shown in the drawings, both sides of the bumper cover 30 in the vehicle width direction are formed to bend toward the vehicle rear side toward the both sides in the vehicle width direction in plan view.

  An extension 32 constituting the design of the vehicle is assembled on the front side of the bumper cover 30, and the bumper cover 30 is covered with the extension 32 from the front side of the vehicle. The extension 32 may be omitted.

  A radiator grill 34 is provided on the vehicle upper side of the vehicle vertical direction center portion of the bumper cover 30. The radiator grill 34 is disposed substantially along the vehicle vertical direction. A hood 36 that covers a power unit chamber (not shown) of the vehicle 10 from the upper side of the vehicle is provided on the upper side of the radiator grille 34.

  Furthermore, a lower absorber 40 extending substantially along the vehicle front-rear direction is provided on the vehicle lower side of the absorber 20 and the bumper reinforcement 14 on the lower side of the front portion of the vehicle 10. In the present embodiment, the front end portion of the lower absorber 40 is disposed on the vehicle front side with respect to the front end portion (projecting portion 24) of the absorber 20, but is not limited to this configuration. Further, the lower end portion of the bumper cover 30 is provided with a protruding portion 42 that protrudes in a substantially C shape on the front side of the vehicle with a gap between the front end portion of the lower absorber 40. By providing the projecting portion 42, the pedestrian can surely easily fall down on the hood 36 side when colliding with the pedestrian.

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

  As shown in FIG. 1, in the front bumper 12 to which the vehicle bumper structure S <b> 1 is applied, a pressure tube 18 arranged along the vehicle width direction is provided on the lower side of the front surface 14 </ b> A of the bumper reinforcement 14. Yes. The absorber 20 is attached to the front surface 14 </ b> A of the bumper reinforcement 14, and the pressure tube 18 is interposed between the absorber 20 and the bumper reinforcement 14 by inserting the pressure tube 18 into the groove portion 22 of the absorber 20. Has been. On the lower side of the absorber 20 in the vehicle vertical direction, a protrusion 24 whose front surface projects from the general surface 20B to the vehicle front side is formed. Further, the absorber 20 is notched on the vehicle lower side so that the length in the vehicle up-down direction becomes shorter from the upper surface 20C toward the vehicle rear side in the vehicle side sectional view, in the upper side of the pressure tube 18. An inclined portion 26 is formed. In the present embodiment, the inclined portion 26 is an inclined surface inclined obliquely downward from the upper surface 20C of the front portion of the absorber 20 toward the vehicle rear side.

  In such an absorber 20, the load is applied when the pressure tube 18 is to be deformed (when the pressure sensor is to be turned on) or when the pressure tube 18 is not desired to be deformed (when the pressure sensor is to be turned off). The transmission range can be divided. That is, in the case of a collision with a road obstacle such as a pedestrian's leg protection performance or a roadside marker, a load is received in the vehicle longitudinal direction (arrow A direction) at the lower part of the absorber 20 provided with the protrusions 24. Thereby, the leg protection performance of a pedestrian can be ensured at the lower part of the absorber 20. When the pedestrian falls to the hood 36 at the time of collision between the pedestrian and the vehicle 10, the pressure tube 18 is received by receiving a load in the direction along the inclined portion 26 (in the direction of arrow B) at the upper part of the absorber 20. Can be crushed.

  FIG. 2 schematically shows a case where the front bumper 12 of the vehicle 10 collides with a collision body 50 simulating a pedestrian's leg. As shown in FIG. 2, when the front bumper 12 collides with the collision body 50, the collision body 50 hits the vicinity of the protrusion 24 of the absorber 20, so that the upper side of the absorber 20 is the rear side of the vehicle with the lower side of the absorber 20 as a fulcrum. (Refer to the solid line in FIG. 2). That is, in the mode in which the pedestrian falls to the hood 36 side, the load is transmitted in the direction along the inclined portion 26 of the absorber 20 and the vicinity of the groove portion 22 of the absorber 20 is crushed. For this reason, a load can be effectively transmitted by the pressure tube 18, and the deformation | transformation of the pressure tube 18 becomes large.

  In this embodiment, the area where the rear surface portion 20A of the absorber 20 above the pressure tube 18 (groove portion 22) hits the bumper reinforcement 14 is such that the rear surface portion 20A of the absorber 20 below the pressure tube 18 (groove portion 22) is bumpy reinforcement. It is smaller than the area corresponding to 14. For this reason, the upper side of the groove part 22 of the absorber 20 tends to be crushed. Thereby, the deformation of the pressure tube 18 is increased, and the pressure sensor connected to the pressure tube 18 is turned on. Thereby, it can detect that the vehicle 10 collided with the pedestrian by ECU which is not illustrated (it can discriminate | determine that a collision body is a pedestrian).

  FIG. 3 schematically shows a case where the front bumper 12 of the vehicle 10 collides with a road obstacle 52 such as a roadside marker. As shown in FIG. 3, when the front bumper 12 collides with the road obstacle 52, the road obstacle 52 hits the vicinity of the protrusion 24 on the lower side of the absorber 20, thereby causing the road obstacle 52 to protrude into the protrusion 24 of the absorber 20. It can be pushed down with. In that case, compared with FIG. 2, the rotation of the upper side of the absorber 20 to the vehicle rear side is less. Further, since the pressure tube 18 (groove portion 22) is provided on the vehicle upper side from the position of the protrusion 24 of the absorber 20 in the vehicle side sectional view, the deformation near the groove portion 22 of the absorber 20 is small, and the pressure tube 18 The transmission of load to can be reduced.

  In such a front bumper 12, by arranging the protrusion 24 of the absorber 20 on the lower side of the front surface 14A of the bumper reinforcement 14 in a vehicle side sectional view, it is possible to ensure the pedestrian's leg protection performance. . Moreover, when the pedestrian falls to the hood 36 side by providing the inclined portion 26 on the upper side of the absorber 20 in a vehicle side cross-sectional view, a load can be transmitted to the pressure tube 18 and protect the pedestrian's legs. Compatibility with performance can be realized.

  Further, in the front bumper 12, the deformation state of the pressure tube 18 (sensitivity of the pressure sensor) can be adjusted by the allowance of the protrusion 24 from the general surface 20B of the absorber 20. For example, it is possible to more effectively divide the load transmission range by increasing the allowance (protrusion direction difference) of the protrusion 24 from the general surface 20B of the absorber 20.

  FIG. 11 shows a front bumper 202 at the front of a vehicle 200 to which the vehicle bumper structure S100 of the comparative example is applied. As shown in FIGS. 11A and 11B, in the front bumper 202, an absorber 204 having a substantially rectangular cross section is attached to the lower side of the front surface 14 </ b> A of the bumper reinforcement 14. . The absorber 204 is formed so that the dimension in the vehicle front-rear direction is longer than the dimension in the vehicle vertical direction in a vehicle side sectional view. The other configuration than the absorber 204 is the same as the configuration of the front bumper 12 shown in FIG.

  As shown in FIG. 11A, when the front bumper 202 of the vehicle 200 collides with a collision body 50 simulating a leg part of a pedestrian, the center of gravity of the collision body 50 is on the upper side (upward in the vehicle vertical direction from the hood 36). Therefore, the collision body 50 rotates in the direction of arrow C around the center of gravity. That is, the pedestrian falls into the hood 36 side and the load is difficult to be transmitted to the absorber. For this reason, in the front bumper 202 of the comparative example, the absorber 204 is weakened (softened) than the absorber 20 shown in FIG. Thereby, the pressure tube 18 is deformed by the deformation of the absorber 204 at the time of collision with the collision body 50. Thereby, the pressure sensor connected to the pressure tube 18 is turned on, and a collision with a pedestrian is detected.

  On the other hand, as shown in FIG. 11B, when the front bumper 202 of the vehicle 200 collides with the obstacle 52 on the road, the absorber 204 is weakened, so that the absorber 204 is easily deformed. For this reason, the pressure tube 18 is deformed by the deformation of the absorber 204. Therefore, even in the case of a road obstacle 52 where the pressure tube 18 is not desired to be crushed, the pressure sensor may be turned on. That is, since the range of the absorber 204 to which the load is transmitted is substantially the same for the collision object 50 (pedestrian) and the obstacle 52 on the road, it is difficult to generate the output difference of the pressure sensor. Actually, the pedestrian falls into the hood 36 as shown by the arrow C in FIG. 11A, and the road obstacle 52 moves to the absorber 204 or the like as shown by the arrow D in FIG. 11B. Despite the different modes that are pushed down, you cannot take advantage of the differences.

  On the other hand, in the front bumper 12 to which the vehicle bumper structure S1 of this embodiment is applied, the transmission of the load of the absorber 20 is performed when the pressure tube 18 is desired to be deformed and when the pressure tube 18 is not desired to be deformed. The range can be divided. That is, in the case of a collision between the road obstacle 52 and the vehicle 10, the road obstacle 52 can be pushed down by the protrusion 24 of the absorber 20, and load transmission to the pressure tube 18 is reduced. When the pedestrian falls to the hood 36 at the time of a collision between the pedestrian and the vehicle 10, the pressure tube 18 is received by receiving a load in the direction along the inclined portion 26 (in the direction of arrow B) on the upper side of the absorber 20. Can be crushed. For this reason, discrimination of a pedestrian and a road obstacle becomes more reliable.

[Second Embodiment]
Next, a second embodiment of the vehicle bumper structure according to the present invention will be described with reference to FIG. In addition, about the same component as 1st Embodiment mentioned above, the same number is attached | subjected and the description is abbreviate | omitted.

  FIG. 4 is a perspective view of the absorber 60 used in the front bumper to which the vehicle bumper structure S2 is applied. As shown in FIG. 4, on the front side of the absorber 60 in the vehicle front-rear direction, a recessed portion 62 that is recessed in the vehicle rear side is formed in the boundary region between the lower protrusion 24 and the upper general surface 20B. Is formed. The concave portion 62 of the absorber 60 is disposed substantially along the vehicle width direction.

  By providing the concave portion 62 in the absorber 60, it is possible to more effectively divide the transmission range of the load of the absorber 60 depending on whether the pressure tube 18 (see FIG. 1) is to be deformed or not. That is, at the time of a collision between the pedestrian and the vehicle, the load is transmitted to the pressure tube 18 disposed in the groove portion 22 by receiving a load above the concave portion 62 of the absorber 60. In addition, when a road obstacle collides with the vehicle, a load is received on the lower side of the concave portion 62 of the absorber 60, so that the pressure tube 18 disposed above the protrusion 24 in the vehicle vertical direction in the vehicle side sectional view. The load is difficult to be transmitted to For this reason, the pressure tube 18 can be more appropriately deformed at the time of a collision between the pedestrian and the vehicle, and the discrimination between the pedestrian and the obstacle on the road becomes more reliable.

  The size of the concave portion 62 in the vehicle vertical direction and the depth of the concave portion 62 in the vehicle front-rear direction are not limited to the present embodiment, and can be changed.

[Third Embodiment]
Next, a third embodiment of the vehicle bumper structure according to the present invention will be described with reference to FIG. In addition, about the same component as 1st and 2nd embodiment mentioned above, the same number is attached | subjected and the description is abbreviate | omitted.

  FIG. 5 is a side sectional view showing a bumper corner portion on the outer side in the vehicle width direction of the front bumper 72 of the vehicle 70 to which the vehicle bumper structure S3 is applied. As shown in FIG. 5, at the vehicle width direction end of the front bumper 72, the bumper cover 80 disposed on the vehicle front side of the absorber 74 is directed toward the vehicle rear side and the vehicle upper side in a vehicle side sectional view. It has a curved shape. That is, the bumper cover 80 is formed so as to bend obliquely upward as it goes toward the vehicle rear side. Although not shown, the bumper cover 80 is formed so as to bend toward the rear side of the vehicle as it goes outward in the vehicle width direction in the vehicle plan view.

  On the front side of the absorber 74 in the vehicle front-rear direction, a concave portion 76 that is recessed in the vehicle rear side is formed in a boundary region between the lower projection 24 and the upper general surface 78. The concave portion 76 is disposed along the vehicle width direction. In the present embodiment, the concave portion 76 is set only at the bumper corner portion of the absorber 74.

  A general surface 78 on the upper side of the absorber 74 (above the concave portion 76) is inclined so as to rise upward toward the vehicle rear side along the shape of the bumper cover 80 disposed on the vehicle front side of the absorber 74. The shape is made. A gap is formed between the general surface 78 and the protrusion 24 of the absorber 74 and the bumper cover 80.

  In such a front bumper 72, when the bumper corner portion of the front bumper 72 collides with a pedestrian, the load is transmitted to the pressure tube 18 by receiving a load at an upper side portion including the general surface 78 of the absorber 74. Is done. Further, when the bumper corner portion of the front bumper 72 collides with an obstacle on the road, the load is hardly transmitted to the pressure tube 18 because the load is received on the lower side of the concave portion 76 of the absorber 74. For this reason, the collision discrimination performance of the pedestrian and the obstacle on the road at the bumper corner can be improved.

In addition, in this embodiment, although the recessed part 76 is set only in the bumper corner part of the absorber 74, it is not limited to this. For example, the structure provided with the recessed part 76 in the vehicle width direction full width of an absorber may be sufficient.
In the present embodiment, the general surface 78 of the absorber 74 has a planar shape inclined toward the vehicle rear side, but is not limited to the planar shape, and is curved along the shape of the bumper cover 80. It is good also as a shape to do.

[Fourth Embodiment]
Next, a fourth embodiment of the vehicle bumper structure according to the present invention will be described with reference to FIG. In addition, about the same component as 1st-3rd embodiment mentioned above, the same number is attached | subjected and the description is abbreviate | omitted.

  FIG. 6 is a side sectional view showing a part of the front bumper 92 to which the vehicle bumper structure S4 is applied. As shown in FIG. 6, the front bumper 92 includes an absorber 94 in which regions having different hardness are set in part. More specifically, the absorber 94 is formed so that the upper side portion 94A including the position of the groove portion 22 into which the pressure tube 18 is inserted is softened in the vehicle side sectional view, and the lower portion below the upper side portion 94A. The side portion 94B is formed to be harder than the upper side portion 94A. Further, a protrusion 96 is provided on the front side of the lower side portion 94B of the absorber 94 so as to protrude forward from the general surface 20B on the front side of the upper side portion 94A. Further, the lower surface 20D of the absorber 92 is inclined more greatly below the vehicle from the front end portion toward the rear end portion than the lower surface 20D of the absorber 20 shown in FIG.

  The absorber should be as soft as possible against deformation of the pressure tube 18. For road obstacles, the absorber should be as hard as possible. For this reason, in this embodiment, by changing the foaming magnification of the upper part 94A and the lower part 94B of the absorber 94, the upper part 94A of the integrally formed absorber 94 is softened, and the lower part 94B is It is harder than the upper part 94A. For example, the expansion ratio of the upper side portion 94A is set to 30 times, and the expansion ratio of the lower side portion 94B is set to 20 times. Here, the expansion ratio means a value obtained by dividing the density of an unfoamed material by the density of the foamed material, and “times” is used as a unit.

  In such a front bumper 92, by softening the upper portion 94 </ b> A of the absorber 94, the upper portion 94 </ b> A of the absorber 94 can be deformed and a load can be transmitted to the pressure tube 18 when the vehicle collides with a pedestrian. . Further, by making the lower part 94B of the absorber 94 harder than the upper part 94A, the road obstacle can be pushed down by the protrusion 96 of the absorber 94 when the vehicle and the road obstacle collide. Therefore, in such an absorber 94, it is possible to transmit the load to the pressure tube 18 more effectively with a simple configuration, and it is possible to easily manufacture the absorber 94.

[Fifth Embodiment]
Next, a fifth embodiment of the vehicle bumper structure according to the present invention will be described with reference to FIG. In addition, about the same component as 1st-4th embodiment mentioned above, the same number is attached | subjected and the description is abbreviate | omitted.

  FIG. 7 is a side sectional view showing a part of the front bumper 102 to which the vehicle bumper structure S5 is applied. As shown in FIG. 7, the front bumper 102 includes an absorber 104 in which regions having different hardness are set in part. More specifically, the absorber 104 includes an upper side portion 104A including a position where the groove portion 22 is formed in a vehicle side cross-sectional view, a lower side portion 104B including a protrusion 96 protruding toward the vehicle front side, An intermediate portion 104C as a hard portion disposed substantially along the vehicle front-rear direction is provided between the side portion 104A and the lower side portion 104B. That is, the intermediate part 104C is formed to be harder than the upper part 104A and the lower part 104B. The front end portion of the intermediate portion 104C extends to the upper base side of the protrusion 96, and the rear end portion of the intermediate portion 104C is located below the groove portion 22. That is, the rear end portion of the intermediate portion 104 </ b> C is disposed on the vehicle lower side from the pressure tube 18. In the present embodiment, the rear side of the intermediate portion 104C from the vehicle front-rear direction intermediate portion in the vehicle side sectional view is arranged substantially horizontally.

  In this embodiment, the intermediate part 104C of the absorber 104 formed integrally by changing the foaming magnification of the upper part 104A and the lower part 104B of the absorber 104 and the intermediate part 104C is changed to the upper part 104A and the lower part. It is harder than the part 104B. For example, the upper part 104A and the lower part 104B are set to substantially the same expansion ratio (for example, 20 to 30 times), and the intermediate part 104C is set to have a foaming ratio of about 15 times. In addition, the numerical value of a foaming ratio is not limited to these, It can change.

In such an absorber 104, by providing an intermediate part 104C that is harder than these parts between the upper part 104A and the lower part 104B, the load transmission of the upper part 104A and the lower part 104B can be made independent. Can do. For example, at the time of the collision between the vehicle and the pedestrian, only the upper side portion 104A above the intermediate portion 104C of the absorber 104 can be mainly deformed and the load can be transmitted to the pressure tube 18. Further, when the vehicle and the road obstacle collide, the road obstacle can be pushed down by the protrusion 96 of the lower side portion 104B below the intermediate portion 104C of the absorber 104. Furthermore, at the time of a collision between the vehicle and an obstacle on the road, it is possible to suppress load transmission to the vicinity of the groove portion 22 of the upper side portion 104A by the intermediate portion 104C of the absorber 104.
Therefore, such an absorber 104 can transmit a load to the pressure tube 18 more effectively at the time of a collision between a vehicle and a pedestrian with a simple configuration, and the absorber 104 can be easily manufactured.

[Sixth Embodiment]
Next, a sixth embodiment of the vehicle bumper structure according to the present invention will be described with reference to FIG. In addition, about the same component as 1st-5th embodiment mentioned above, the same number is attached | subjected and the description is abbreviate | omitted.

  FIG. 8 is a side sectional view showing a part of the front bumper 112 to which the vehicle bumper structure S6 is applied. As shown in FIG. 8, the front bumper 112 includes an absorber 114 in which regions having different hardnesses are set in part. More specifically, the absorber 114 includes an upper side portion 114A including a position where the groove portion 22 is formed in a vehicle side sectional view, a lower side portion 114B including a protrusion 96 protruding toward the front side of the vehicle, An intermediate portion 114C as a hard portion disposed substantially along the vehicle front-rear direction is provided between the side portion 114A and the lower side portion 114B. That is, the intermediate part 114C is formed to be harder than the upper part 114A and the lower part 114B. The intermediate portion 114C is arranged so as to be inclined obliquely downward from the front end portion in the vehicle front-rear direction toward the rear end portion in the vehicle side sectional view. In the present embodiment, the front end portion of the intermediate portion 114C is located in the boundary region between the protrusion 96 and the general surface 20B, and the rear end portion of the intermediate portion 114C is located below the groove portion 22. The rear end portion of the intermediate portion 114 </ b> C is disposed on the vehicle lower side than the pressure tube 18.

  In the present embodiment, by changing the expansion ratio of the upper side portion 114A and the lower side portion 114B of the absorber 114 and the intermediate portion 114C, the intermediate portion 114C of the integrally formed absorber 114 is changed to the upper side portion 114A and the lower side portion 114A. It is harder than the part 114B. In the present embodiment, the expansion ratios of the upper part 114A and the lower part 114B are set to be approximately the same, but the present invention is not limited to this, and the expansion ratios of the upper part 114A and the lower part 114B may be changed. .

In such an absorber 114, by providing an intermediate part 114C that is harder than these parts between the upper part 114A and the lower part 114B, the load transmission of the upper part 114A and the lower part 114B can be made independent. Can do. At that time, the intermediate portion 114C is arranged so as to be inclined obliquely downward in the vehicle toward the vehicle rear side in the vehicle side sectional view, so that the position (height) of the groove portion 22 and the projection 96 and the general surface Even when it is disposed at substantially the same position (height) as the boundary region of 20B, the load transmission of the upper side portion 114A and the lower side portion 114B can be made independent.
Therefore, with such an absorber 114, it is possible to transmit the load to the pressure tube 18 more effectively with a simple configuration, and it is possible to easily manufacture the absorber 114.

  Instead of the absorber 114 of the present embodiment, the absorber 22 may be arranged such that the position of the groove portion 22 is located on the vehicle lower side with respect to the boundary region between the protrusion 96 and the general surface 20B in the vehicle side sectional view. Even in this case, the rear end portion of the intermediate portion of the absorber is disposed below the groove portion 22, so that the load transmission of the upper portion and the lower portion of the absorber can be made independent.

  In the fifth and sixth embodiments, the intermediate part of the absorbers 104 and 114 is set to a foaming ratio that is harder than the foaming ratio of the upper part and the lower part. However, the present invention is not limited to this. It is not a thing. For example, intermediate portions of the absorbers 104 and 114 may be integrally formed by insert molding a harder resin than the upper side portion and the lower side portion.

[Seventh Embodiment]
Next, a seventh embodiment of the vehicle bumper structure according to the present invention will be described with reference to FIG. In addition, about the same component as 1st-6th embodiment mentioned above, the same number is attached | subjected and the description is abbreviate | omitted.

  FIG. 9 is a side sectional view showing a part of the front bumper 122 to which the vehicle bumper structure S7 is applied. As shown in FIG. 9, the front bumper 122 includes an absorber 124 in which regions having different hardness are set in part. More specifically, the absorber 124 is formed such that the upper side portion 124A including the position where the groove portion 22 is formed is softened in a vehicle side sectional view, and the lower side portion 124B below the upper side portion 124A is upper. It is formed to be harder than the side portion 124A. Further, in the upper portion 124A of the absorber 124, a hard portion disposed so as to be inclined obliquely downward in the vehicle from the upper side of the general surface 20B toward the vicinity of the groove portion 22 on the rear side of the vehicle in a vehicle side sectional view. As a hard part 124C is provided. The hard portion 124C is formed to be harder than other portions of the upper portion 124A of the absorber 124, and is disposed along the inclined portion 26 in a vehicle side sectional view. The rear end portion of the hard portion 124 </ b> C is disposed on the vehicle front side of the pressure tube 18. The hard portion 124 </ b> C is not formed around the groove portion 22 so as not to hinder deformation of the absorber 124 near the groove portion 22.

  In the present embodiment, the expansion ratio of the hard part 124C of the absorber 124 and the expansion ratio of the lower part 124B of the absorber 124 are changed from the expansion ratio of other parts of the upper part 124A of the absorber 124. Thereby, the hard part 124C and the lower part 124B of the integrally formed absorber 124 are made harder than the other parts of the upper part 124A.

  In addition, a protrusion 126 that protrudes from the general surface 20B on the front side of the vehicle to the front side of the vehicle is provided at the lower portion of the absorber 124. In the present embodiment, the protrusion 126 of the absorber 124 is configured such that the amount of protrusion to the front of the vehicle is greater than the protrusion 24 of the absorber 20 of the first embodiment.

In such a front bumper 122, an upper portion 124A of the absorber 124 is provided with a hard portion 124C arranged so as to be inclined obliquely downward from the upper side of the general surface 20B toward the vicinity of the groove 22 on the vehicle rear side. ing. Accordingly, the hard portion 124C of the absorber 124 is not easily deformed at the time of collision between the vehicle and the pedestrian, so that the vicinity of the groove portion 22 of the absorber 124 can be crushed by the hard portion 124C and the pressure tube 18 can be pressed directly.
Further, by making the lower part 124B of the absorber 124 harder than the upper part 124A, the road obstacle can be pushed down by the protrusion 126 of the absorber 124 when the vehicle and the road obstacle collide.

  Further, even when the lower part 124B of the absorber 124 is made harder than the upper part 124A, the amount of protrusion on the vehicle front side of the protrusion 126 of the absorber 124 is increased to absorb the impact and protect the leg of the pedestrian. Performance can be ensured. In such an absorber 124, a load can be more effectively transmitted to the pressure tube 18 with a simple configuration, and the absorber 124 can be easily manufactured.

[Eighth Embodiment]
Next, an eighth embodiment of the vehicle bumper structure according to the present invention will be described with reference to FIG. In addition, about the same component as 1st-7th embodiment mentioned above, the same number is attached | subjected and the description is abbreviate | omitted.

  FIG. 10 is a side sectional view showing a part of the front bumper 132 to which the vehicle bumper structure S8 is applied. As shown in FIG. 10, the front bumper 132 includes an absorber 134 in which regions having different hardness are set in part. More specifically, the upper portion 134A of the absorber 134 is arranged along the vehicle vertical direction from the vehicle longitudinal direction intermediate portion of the inclined portion 26 toward the front side position of the groove portion 22 in the vehicle side sectional view. A hard part 134B is provided as a hard part. The hard part 134B is formed to be harder than the other part of the absorber 134, and is disposed so as to intersect with the inclined part 26 in a vehicle side sectional view. The hard portion 134B is not formed around the groove portion 22 so as not to hinder the deformation of the absorber 134 in the vicinity of the groove portion 22. The rear end portion of the hard portion 134B is disposed on the vehicle front side of the pressure tube 18.

  In the present embodiment, the hard part 134B of the integrally formed absorber 134 is made harder than the other parts by changing the foaming ratio of the hard part 134B of the absorber 134 with the foaming ratio of the other part of the absorber 134. Yes.

  In such a front bumper 132, the hard portion 134B is sandwiched between the periphery of the groove portion 22 of the absorber 134 and the portion on the front portion side of the absorber 134, so that an output to the pressure tube 18 at the time of a collision between the vehicle and the pedestrian is performed. It is easy to come out. For example, when a load is transmitted along the inclined portion 26 at the time of a collision between a vehicle and a pedestrian, the load may escape around the groove portion 22 in the vicinity of the pressure tube 18. On the other hand, in the absorber 134 of this embodiment, the pressure tube 18 can be firmly pressed by the hard part 134B by providing the hard part 134B around the groove part 22. For this reason, the load can be transmitted to the pressure tube 18 more effectively with a simple configuration, and the absorber 134 can be easily manufactured.

  In the seventh and eighth embodiments, the hard parts of the absorbers 124 and 134 are set to a foaming ratio that is harder than the foaming ratios of the other parts of the absorbers 124 and 134, but the present invention is not limited to this. It is not something. For example, the hard portions of the absorbers 124 and 134 may be integrally formed by insert molding a harder resin than the other portions of the absorbers 124 and 134.

  In addition, in the 1st-8th embodiment, although the pressure tube 18 is provided as a pedestrian collision detection sensor, it is not limited to a pressure tube. For example, as the pedestrian collision detection sensor, a sensor such as a chamber type or an optical fiber type whose output changes when pressed (can be sensed by pressing) may be used.

  Moreover, in 1st-8th embodiment, although the inclination part 26 is provided as a notch part of the upper part side of an absorber, it is not limited to the inclination part 26. As shown in FIG. That is, the cutout portion may have a shape cut out on the vehicle lower side so that the length in the vehicle vertical direction becomes shorter from the upper surface in the vehicle vertical direction toward the vehicle rear side in the vehicle side sectional view. For example, the notch may be a curved surface that is notched so as to be concavely curved from the upper surface of the absorber toward the rear side of the vehicle, or the notch portion of the absorber may be curved from the upper surface of the absorber toward the rear side of the vehicle. It is good also as a notch part of the hollow shape, step shape, or substantially rectangular shape formed so that a rear-end corner | angular part might be notched. In that case, it is preferable to make the hollow part of a notch part into a smooth surface. That is, the upper part of the absorber may have any shape that can crush the vicinity of the pressure tube by receiving a load obliquely below the vehicle along the notch.

10 Vehicle 14 Bumper reinforcement 18 Pressure tube (pedestrian collision detection sensor)
20 Absorber 20B General surface 20C Upper surface 22 Groove portion 24 Projection portion 26 Inclined portion (notch portion)
60 Absorber 62 Concave part 70 Vehicle 74 Absorber 76 Concave part 78 General surface 80 Bumper cover 94 Absorber 94A Upper part (parts with different expansion ratios)
94B Lower part (parts with different expansion ratios)
96 Protrusion 104 Absorber 104C Intermediate part (hard part)
114 Absorber 114C Intermediate part (hard part)
124 Absorber 124A Upper part (parts with different expansion ratios)
124B Lower part (parts with different expansion ratios)
124C Hard part (hard part)
126 Projection 134 Absorber 134B Hard part (hard part)
S1 Bumper structure for vehicle S2 Bumper structure for vehicle S3 Bumper structure for vehicle S4 Bumper structure for vehicle S5 Bumper structure for vehicle S6 Bumper structure for vehicle S7 Bumper structure for vehicle S8 Bumper structure for vehicle

Claims (7)

A bumper reinforcement extending along the vehicle width direction is provided on the lower side of the vehicle vertical direction of the bumper reinforcement, arranged along the vehicle width direction on the vehicle front side of the bumper reinforcement, and output by pressing. A changing pedestrian collision detection sensor;
An absorber disposed on the vehicle front side of the bumper reinforcement, and disposed with the pedestrian collision detection sensor interposed between the bumper reinforcement and the bumper reinforcement;
A protrusion formed on the lower side of the vehicle in the vertical direction of the absorber, and a front surface of the vehicle front-rear direction protruding from the general surface to the vehicle front side;
It is formed on the upper side of the vehicle in the vertical direction of the pedestrian collision detection sensor in the absorber so that the length in the vertical direction of the vehicle becomes shorter from the upper surface in the vertical direction of the vehicle toward the rear side of the vehicle in a sectional view of the vehicle. A notch cut out on the vehicle lower side;
A bumper structure for vehicles.   2. The vehicle bumper according to claim 1, wherein a concave portion that is disposed along a vehicle width direction and is recessed in a concave shape on a vehicle rear side is formed in a boundary region between the protrusion and the general surface in the absorber. Construction. The bumper cover disposed on the vehicle front side of the absorber is a bumper corner portion on the outer side in the vehicle width direction, and has a curved shape toward the vehicle rear side and the vehicle upper side in a vehicle side cross-sectional view.
At the bumper corner portion, the concave portion is provided in the absorber, and the general surface above the vehicle in the absorber is inclined so as to rise upward toward the vehicle rear side along the shape of the bumper cover. The bumper structure for vehicles according to claim 2 made into shape.   The vehicular bumper structure according to any one of claims 1 to 3, wherein regions having different hardness are set in a part of the absorber.   The vehicular bumper structure according to claim 4, wherein a part having a different expansion ratio is provided in a part of the absorber.   The vehicle bumper structure according to claim 4 or 5, wherein the absorber is provided with a hard portion along a vehicle front-rear direction on a vehicle lower side of the pedestrian collision detection sensor.   The vehicular bumper structure according to claim 4 or 5, wherein the absorber is provided with a hard portion on a vehicle front side of the pedestrian collision detection sensor.

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