JP2019014461A - Vehicular bumper - Google Patents

Abstract

To increase deformation stroke amount in a vehicle longitudinal direction of a bumper absorber when receiving a collision load.SOLUTION: A vehicular bumper 20 includes a bumper reinforce 40, a bumper absorber 30 and a bumper cover 21. The bumper absorber 30 is alternately provided with a portion H which receives a collision load and is crushed and a portion which hardly receives the collision load and is hardly crushed in a vehicle width direction when the collision load is applied to the bumper cover 21. A gap between the portion H which is crushed by the collision load and the portion which is hardly crushed is configured to be broken.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a bumper for a vehicle including a bumper reinforcement supported by a vehicle body, a bumper absorber for a cushioning material, and a bumper cover.

  A technique related to a conventional vehicle bumper is described in Patent Document 1. The vehicle bumper of Patent Document 1 is a front bumper 100 of a vehicle. 10 and 11, the front bumper 100 includes a bumper reinforcement 102 supported by the vehicle body, a bumper absorber 104 that absorbs a collision load, and a bumper cover 106 that covers the bumper absorber 104 and the like.

JP 2007-216804 A

  In the front bumper 100 described above, when the bumper cover 106 is recessed rearward due to a collision load, the front surface of the bumper absorber 104 is recessed together with the bumper cover 106. Here, the bumper cover 106 is harder than the bumper absorber 104 and is not easily deformed. Therefore, when a collision load is applied, a wider range than the range in which the collision load is applied becomes depressed. As a result, the collision load can be received in a relatively wide range between the bumper cover 106 and the bumper absorber 104. For this reason, the deformation stroke amount of the bumper absorber 104 in the vehicle front-rear direction is small, and the impact load absorption efficiency is low.

  The present invention has been made to solve the above problems, and the problem to be solved by the present invention is to increase the deformation stroke amount of the bumper absorber in the longitudinal direction of the vehicle when subjected to a collision load. It is to be.

  The above-described problems are solved by the inventions of the claims. The invention of claim 1 is a vehicle bumper comprising a bumper reinforcement connected to a vehicle body, a bumper absorber of a cushioning material provided in front of the bumper reinforcement, the bumper absorber, and a bumper cover covering the bumper reinforcement. In the bumper absorber, when a collision load is applied to the bumper cover, a portion that is crushed by receiving the collision load and a portion that is hard to receive the collision load and hardly crushed are alternately arranged in the vehicle width direction. It is provided, and it is comprised so that between the said crushing site | part and the site | part which is hard to crush by the said collision load may fracture | rupture.

  According to the present invention, the bumper absorber is provided with the portions to be crushed and the portions to be hardly crushed alternately in the vehicle width direction. When a collision load is applied to the bumper cover, the collapsing portion of the bumper absorber receives the collision load in a concentrated manner and becomes crushed. Further, the crushing part and the part that is hard to crush are broken by the collision load. For this reason, compared with the case where the wide range of the said bumper absorber is crushed, the deformation | transformation stroke amount in the vehicle front-back direction of a bumper absorber can be enlarged.

  According to the invention of claim 2, when a plurality of pressing parts harder than the bumper absorber are provided at intervals in the vehicle width direction between the bumper cover and the bumper absorber, and a collision load is applied to the bumper cover Further, the pressing portion is configured to press a pressed portion on the surface of the bumper absorber, and the pressed portion side or the surface of the bumper absorber is pressed against the pressed portion of the bumper absorber and the others by the collision load. Breaking means for breaking between these parts is provided.

  For this reason, when a collision load is applied to the bumper cover, a plurality of pressing portions provided at intervals in the vehicle width direction press the pressed portion of the bumper absorber. That is, the collision load is concentrated and applied to the pressed part of the bumper absorber, and the pressed part of the bumper absorber is easily crushed. On the other hand, parts other than the pressed part of the bumper absorber are not easily crushed. Then, by the action of the breaking means, the pressed portion of the bumper absorber and the other portion are broken.

  According to the invention of claim 3, the pressing portion is a convex portion provided in front of the bumper absorber, and the breaking means is a groove portion formed between the pressed portion of the bumper absorber and the other portion. For this reason, when a collision load is applied to the bumper cover, the convex portion surely presses the pressed portion of the bumper absorber. Then, the bumper absorber breaks in the vehicle front-rear direction starting from the groove, so that only the pressed part is crushed in the vehicle front-rear direction.

  According to invention of Claim 4, a press part is a convex part in the to-be-pressed part of the surface of a bumper absorber, and a fracture | rupture means is a groove part formed between the to-be-pressed part of the said bumper absorber, and other parts. is there. For this reason, when a collision load is applied to the bumper cover, the convex portion surely presses the pressed portion of the bumper absorber. Then, the bumper absorber breaks in the vehicle front-rear direction starting from the groove, so that only the pressed part is crushed in the vehicle front-rear direction.

  According to the invention of claim 5, the pressing part is a convex part provided in front of the bumper absorber, and the breaking means protrudes from the tip of the convex part on both sides in the vehicle width direction of the convex part. Is a wedge-shaped member. For this reason, when a collision load is applied to the bumper cover, the wedge-shaped member of the bumper cover breaks between the pressed portion of the bumper absorber and the other portion, and the convex portion surely presses the pressed portion of the bumper absorber. It comes to press.

  According to the present invention, it is possible to increase the deformation stroke amount of the bumper absorber in the vehicle front-rear direction when receiving a collision load.

It is a side view of a vehicle provided with the bumper for vehicles (front bumper) concerning Embodiment 1 of the present invention. It is a model longitudinal cross-sectional view of the bumper for vehicles which concerns on this embodiment. It is a plane sectional view (III-III arrow sectional view of Drawing 2) of a bumper for vehicles. It is the IV section enlarged view of FIG. It is the perspective view which looked at the bumper absorber from the left front. It is a plane sectional view showing operation of a bumper cover and a bumper absorber when a leg part of a pedestrian collides. 6 is a plan sectional view of a vehicle bumper according to a first modification. FIG. It is a perspective view showing the bumper absorber of the vehicle bumper which concerns on the example 2 of a change. It is a plane sectional view of the bumper for vehicles concerning example 3 of a change. It is a plane sectional view of the conventional vehicular bumper. It is a longitudinal cross-sectional view of the conventional vehicle bumper.

Embodiment 1
Hereinafter, the vehicle bumper according to the first embodiment of the present invention will be described with reference to FIGS. The vehicle bumper according to the present embodiment is the front bumper 20 of the passenger car 10 shown in FIG. Here, the front, rear, left, right, and top and bottom shown in the figure correspond to the front, back, left, right, and top and bottom of the passenger car 10 including the front bumper 20 according to the present embodiment.

<About the outline of the front structure of the passenger car 10>
Before describing the front bumper 20, the front structure of the passenger car 10 will be briefly described. As shown in FIG. 3, a pair of front side members 14 extending in the vehicle front-rear direction are provided on the left and right sides of the engine room 12 at the vehicle body front portion of the passenger car 10. Crash boxes 16 are attached substantially coaxially to the front end positions of the left and right front side members 14, respectively. The left and right crash boxes 16 are connected to the left and right ends of the front bumper 20. The crash box 16 is configured to absorb a collision load by being crushed between the front bumper 20 and the side member 14 at the time of a forward collision of the passenger car 10.

<About the configuration of the front bumper 20>
As shown in FIG. 2, the front bumper 20 includes a bumper reinforcement 40, a bumper absorber 30, a bumper cover 21, a bumper grill 23, and a tube sensor 50 of a pedestrian collision detection device. As shown in FIG. 3, the bumper reinforcement 40 is a beam-like member extending in the vehicle width direction, and the left and right ends of the bumper reinforcement 40 are connected to the left and right crash boxes 16. The bumper reinforcement 40 is made of, for example, an aluminum alloy, and includes an upper rectangular tube portion 41 and a lower rectangular tube portion 43 provided on the upper and lower sides as shown in FIG.

  As shown in FIGS. 2 and 3, a bumper absorber 30 is attached to the front face of the upper rectangular tube portion 41 of the bumper reinforcement 40. The bumper absorber 30 is, for example, a cushioning material made of styrene foam, and is formed in a beam shape having a substantially square cross section as shown in FIG. The bumper absorber 30 is arranged so as to extend in the vehicle width direction, so that the bumper absorber 30 covers the front surface of the upper rectangular tube portion 41 of the bumper reinforcement 40 over the entire vehicle width direction. A storage groove 32 for storing the tube sensor 50 is formed on the rear end surface of the bumper absorber 30 so as to extend in the vehicle width direction.

  The tube sensor 50 is housed in the housing groove 32 of the bumper absorber 30 so as to extend between the bumper absorber 30 and the bumper reinforcement 40 in the vehicle width direction. A pressure sensor (not shown) that detects the internal pressure of the tube sensor 50 is connected to the tube sensor 50. That is, the pressure sensor is configured to detect a pressure change when the tube sensor 50 is crushed in response to a collision load. And the said pedestrian collision detection apparatus is comprised so that it can determine whether the leg part of the pedestrian collided with respect to the front bumper 20 with the pressure signal value of a pressure sensor.

  As shown in FIGS. 1, 2, etc., the bumper cover 21 is a member that constitutes the external design of the front bumper 20, and is configured to cover the bumper absorber 30 and the bumper reinforcement 40. The inner side of the lower end of the bumper cover 21 is supported by a lower absorber 35. Further, a bumper grille 23 serving as a decorative member is attached to the bumper cover 21 at the center position as an air intake port. Here, the bumper cover 21 and the bumper grille 23 are made of resin and are sufficiently hard with respect to the bumper absorber 30 as a buffer material.

<About the collision load absorption structure of the front bumper 20>
On the inner wall surfaces of the bumper cover 21 and the bumper grille 23 of the front bumper 20, the gap between the bumper cover 21 and the bumper absorber 30 and the bumper grille are located at the same height as the bumper absorber 30 as shown in FIGS. A gap filling material 22 for filling a gap between the bumper absorber 30 and the bumper absorber 30 is provided. The gap member 22 includes a large number of convex portions 220 at equal intervals in the vehicle width direction. The convex portion 220 is a square protrusion having a trapezoidal cross-sectional shape, and is set so that the thickness dimension in the vertical direction is larger than the thickness dimension in the vertical direction of the bumper absorber 30 as shown in FIG. Further, as shown in FIGS. 3 and 4, a pressed portion H is provided on the front surface 31 of the bumper absorber 30 at a position corresponding to each convex portion 220 of the gap member 22. As a result, when a collision load is applied to the bumper cover 21 or the bumper grille 23, the tip surface 223 of the convex portion 220 of the gap member 22 presses the pressed portion H of the corresponding bumper absorber 30. In FIG. 4, the bumper cover 21 and the like are omitted.

  Further, as shown in FIGS. 4 and 5, a vertical groove portion 311 extending in the vertical direction is formed on the front surface 31 of the bumper absorber 30 between the pressed portion H and other portions. That is, the vertical groove 311 is formed at a position where the pressed part H is sandwiched from both sides in the vehicle width direction. The longitudinal groove 311 is formed in a triangular cross section, and the bottom of the longitudinal groove 311, that is, the portion corresponding to the apex of the triangle is aligned with the position of the corner 224 of the tip surface 223 of the convex portion 220. Therefore, when the bumper cover 21 or the bumper grille 23 (hereinafter simply referred to as the bumper cover 21) receives the collision load and presses the pressed portion H of the bumper absorber 30 through the convex portion 220 of the gap member 22. The bumper absorber 30 breaks in the vehicle front-rear direction starting from the longitudinal groove 311.

  Here, the width dimension of the convex part 220 (tip surface 223) of the gap member 22 and the gap dimension of the adjacent convex part 220 are set to the width dimension W1 and the gap dimension W0 as shown in FIG. Yes. Here, the width dimension W1 and the gap dimension W0 are, for example, that a collision load when a small animal (kg) such as a cat collides at a predetermined speed is applied to the pressed portion H of the bumper absorber 30 via the convex portion 220. Is set to a value such that the pressed portion H is not crushed. Further, the width dimension W1 and the gap dimension W0 are, for example, a bumper absorber in which a collision load F when a leg portion (mass below the knee = 8.5 kg) of a 6-year-old dummy doll collides at a predetermined speed via the convex portion 220. It is set to such a value that when pressed to 30 pressed parts H, the pressed part H is crushed well toward the rear of the vehicle. Then, when the pressed part H is crushed rearward of the vehicle, the bumper absorber 30 breaks in the vehicle front-rear direction starting from the longitudinal groove 311. That is, the bumper cover 21 and the bumper grille 23 correspond to the bumper cover of the present invention, and the gap member 22 corresponds to the pressing portion of the present invention. Further, the longitudinal groove portion 311 of the front surface 31 of the bumper absorber 30 corresponds to the breaking means of the present invention.

  When a collision load is applied to the front bumper 20, the tube sensor 50 provided between the bumper absorber 30 and the bumper reinforcement 40 is crushed, and the pressure at this time is detected by the pressure sensor. In the pedestrian collision detection device, a value larger than the pressure signal value of the pressure sensor when the small animal collides and a value smaller than the pressure signal value of the pressure sensor when the leg of the 6-year-old dummy doll collides. It is set as the reference pressure value. Then, the pedestrian collision detection device determines that the pedestrian has collided when the pressure signal value of the pressure sensor becomes larger than the reference pressure value, and an operation signal for the actuator that lifts the engine hood 18 (see FIG. 2) Is output.

<Operation of front bumper 20>
Next, the operation of the front bumper 20 when a pedestrian's leg collides with the front bumper 20 will be described with reference to FIG. When a collision load F due to the collision of the pedestrian's legs is applied to the front bumper 20, the bumper cover 21 is pressed against the pressed portion H of the front surface 31 of the bumper absorber 30 via the tip surface 223 of the convex portion 220 of the gap member 22. Press. As a result, the pressed part H of the bumper absorber 30 is crushed rearward of the vehicle, and the bumper absorber 30 breaks in the vehicle front-rear direction between the pressed part H and the other parts starting from the longitudinal groove 311. That is, only the pressed part H of the bumper absorber 30 is crushed rearward from the other part.

  When the pressed portion H of the bumper absorber 30 is crushed, the tube sensor 50 provided between the bumper absorber 30 and the bumper reinforcement 40 is crushed, and the pressure at this time is detected by the pressure sensor. In this case, since the pressure signal value of the pressure sensor becomes larger than the reference pressure value, the pedestrian collision detection apparatus operates the actuator to lift the engine hood 18. This makes it difficult for the head of the pedestrian to hit the engine or the like in the engine room 12. When the small animal collides with the front bumper 20, the bumper absorber 30 is not crushed and the pressure signal value of the pressure sensor is smaller than the reference pressure value, so that the actuator does not operate.

<Advantages of the front bumper 20 according to this embodiment>
According to the front bumper 20 according to the present embodiment, when a collision load F is applied to the bumper cover 21, a plurality of convex portions 220 (pressing portions) provided at intervals in the vehicle width direction are pressed portions of the bumper absorber 30. Press H. Further, the vertical groove portion 311 (breaking means) of the bumper absorber 30 breaks so that the pressed portion H of the bumper absorber 30 and the other portion are cut. That is, when a collision load F is applied to the bumper cover 21, the collision load F is concentrated and applied to the pressed portion H of the bumper absorber 30, and only the pressed portion H of the bumper absorber 30 is in the vehicle rearward direction. It becomes crushed. For this reason, the deformation stroke amount of the bumper absorber 30 in the vehicle rear direction can be increased as compared with a case where the wide range of the bumper absorber 30, that is, the pressed portion H and its periphery are crushed. Thereby, the absorption efficiency of the collision load of the front bumper 20 improves.

[Example of change]
The present invention is not limited to the above embodiment, and can be modified without departing from the present invention. For example, in this embodiment, as shown in FIGS. 3 and 4, a gap member 22 is provided inside the bumper cover 21, and a convex portion 220 that presses the pressed portion H of the bumper absorber 30 against the gap member 22. The example which provides is shown. However, it is also possible to omit the gap member 22 and bond a hard pressing resin plate 34 to the pressed portion H of the bumper absorber 30 as shown in FIG. Thereby, when a collision load is applied to the front bumper 20, the collision load is applied to the pressed portion H of the bumper absorber 30 via the bumper cover 21 and the pressing resin plate 34. Instead of adhering the hard pressing resin plate 34 to the pressed portion H of the bumper absorber 30, a portion corresponding to the pressing resin plate 34 may be formed of expanded polystyrene having a foaming ratio harder than that of the main body of the bumper absorber 30. That is, the pressing resin plate 34 corresponds to the pressing portion and the convex portion of the present invention.

  Moreover, in this embodiment, as shown in FIG. 5, the example which forms the vertical groove part 311 extended in an up-down direction between the to-be-pressed part H of the bumper absorber 30 and other parts was shown. However, as shown in FIG. 8, it is also possible to form a lateral groove portion 315 extending in the vehicle front-rear direction between the pressed portion H of the bumper absorber 30 and the upper and lower surfaces between the other portions. In the present embodiment, the vertical groove portion 311 is formed in a portion excluding the upper end edge and the lower end edge of the bumper absorber 30. However, the bumper absorber 30 may be formed from the upper end to the lower end. Moreover, although the example which forms the horizontal groove part 315 in the part except the front-end edge and rear-end edge of the bumper absorber 30 was shown in FIG. 8, it is also possible to form from the front end of the bumper absorber 30 to a rear end.

  Moreover, in this embodiment, as shown in FIG. 5, FIG. 8, the example which provides the groove parts 311 and 315 between the to-be-pressed site | part H of the bumper absorber 30 and the other site | part was shown. However, as shown in FIG. 9, the groove portions 311 and 315 of the bumper absorber 30 are omitted, and wedge-shaped members 226 that protrude from the tip of the convex portion 220 are provided on both sides of the convex portion 220 of the gap member 22 in the vehicle width direction. It is also possible to provide it. Moreover, although the vehicle bumper provided with the tube sensor 50 is illustrated in the present embodiment, the present invention can also be applied to a vehicle bumper that does not include the tube sensor 50.

20 ... Front bumper (vehicle bumper)
21 ... Bumper cover 23 ... Bumper grill (bumper cover)
22... Gap material (pressing part)
220 ... convex part (pressing part)
223... Tip end surface 224... Corner 226... Wedge-shaped member (breaking means)
30 ... Bumper absorber 31 ... Front 311 ... Vertical groove (breaking means)
315 ... Horizontal groove (breaking means)
34 ... Pressing resin plate (pressing part, convex part)
H: Pressed part 40 ... Bumper reinforcement 50 ... Tube sensor

Claims (5)

A bumper reinforcement that is connected to a vehicle body, a bumper absorber that is provided in front of the bumper reinforcement, and a bumper cover that covers the bumper absorber and the bumper reinforcement.
In the bumper absorber, when a collision load is applied to the bumper cover, a portion that is crushed due to the collision load and a portion that is difficult to be crushed due to the collision load are alternately provided in the vehicle width direction. And a bumper for a vehicle configured to break between the crushing portion and the crushing portion by the collision load. The vehicle bumper according to claim 1,
Between the bumper cover and the bumper absorber, a plurality of pressing portions harder than the bumper absorber are provided at intervals in the vehicle width direction, and when the collision load is applied to the bumper cover, the pressing portion is It is a configuration that presses the pressed portion of the surface of the bumper absorber,
A vehicular bumper provided with breaking means for breaking between a pressed portion of the bumper absorber and the other portion by the collision load on the pressing portion side or the surface of the bumper absorber. The vehicle bumper according to claim 2,
The pressing part is a convex part provided in front of the bumper absorber,
The vehicle breaker, wherein the breaking means is a groove formed between a pressed portion of the bumper absorber and other portions. The vehicle bumper according to claim 2,
The pressing portion is a convex portion in a pressed portion on the surface of the bumper absorber,
The vehicle breaker, wherein the breaking means is a groove formed between a pressed portion of the bumper absorber and other portions. The vehicle bumper according to claim 2,
The pressing part is a convex part provided in front of the bumper absorber,
The vehicle bumper is a wedge-shaped member provided so that the breaking means protrudes from the tip of the convex portion on both sides in the vehicle width direction of the convex portion.

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