JP2007331649A - Shock absorbing structure for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide simply constructed shock absorbing structure for a vehicle, which reduces a shock to a collision object when the vehicle collides against the collision object such as a pedestrian. <P>SOLUTION: The shock absorbing structure for a vehicle is provided with: a shock absorbing material 2, which is arranged on the back side of a bumper fascia 1 with a gap G between the bumper fascia 1 and it; and a driving means pushing the shock absorbing material 2 by using a retraction force when the bumper fascia 1 retracts to bring the shock absorbing material 2 into contact with the back side of the bumper fascia 1. The driving means is provided with: a rack 6, in which one end is fixed to the back face of the bumper fascia 1 while the other end is arranged toward the vehicle rear side; a gear 7 installed to a side member 5 freely rotationally to mesh with the rack 6, and an arm 9 connected to the gear 7 to be freely rock around the gear 7. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an impact absorbing device for a vehicle suitable for alleviating an impact on an impacted object when the vehicle collides with an impacted object such as a pedestrian.

Conventionally, a shock absorber made of foamed resin or the like has been installed behind the bumper fascia in the front part of the vehicle, and when the vehicle collides with a pedestrian or the like while the vehicle is running, together with the bumper fascia using the biasing force of the coil spring There has been proposed a vehicle impact absorbing device in which an impact absorbing material is pushed forward to alleviate an impact on a pedestrian or the like (for example, see Patent Document 1).
JP 2004-74972 A

  However, the above-described conventional technology requires means for detecting that the vehicle has collided with an impacted object such as a pedestrian (for example, a pre-crash laser sensor), which complicates the configuration and increases costs. It is a factor.

  An object of the present invention is to provide a shock absorbing structure for a vehicle having a simple configuration that can alleviate an impact on a collided object such as a pedestrian when the vehicle collides forward.

  In order to solve the above-described problems, the present invention provides an impact absorbing material disposed with a gap between the bumper fascia on the back side of the bumper fascia, and when the bumper fascia recedes during a front collision, And driving means for pushing the shock absorbing material forward of the vehicle using the force to contact the back surface of the bumper fascia.

  According to the above configuration, the bumper fascia retreats at the time of the front collision, but by using the retreating force, the driving means pushes the shock absorber toward the front of the vehicle and brings the shock absorber into contact with the back surface of the bumper fascia. Thereby, the impact at the time of the front impact is absorbed by the impact absorbing material, and the impact on the pedestrian or the like can be mitigated.

  According to the present invention, it is possible to realize a shock absorbing structure for a vehicle having a simple configuration that can alleviate an impact on a collided object when the vehicle collides with a collided object such as a pedestrian. It becomes.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIGS. 1 and 2 show a shock absorber for a vehicle according to the present invention. FIG. 1 is a cross-sectional view of a front part of a vehicle near a bumper fascia, and FIG. 2 is a view of SA-SA in FIG. It is sectional drawing along a line. In FIG. 1, the upper part is the vehicle front side, and in FIG. 2, the left side is the vehicle front side.

  As shown in FIG. 1, a bumper fascia 1 is installed in the front part of the vehicle, and a shock absorber 2 is disposed on the back side of the bumper fascia 1 with a gap G between the bumper fascia 1 and the bumper fascia 1. The front side surface of the shock absorber 2 is formed in a shape that substantially matches the back surface shape of the bumper fascia 1.

  The shock absorber 2 is disposed along the cross member 3 disposed in the vehicle width direction, and is disposed so that the rear end side wraps (overlaps) the cross member 3. That is, as shown in FIG. 2, two cross members 3 are provided at the top and bottom, and the rear end portion of the shock absorbing material 2 is inserted between the two cross members 3. A shock absorber support member 4 is provided on the rear end surface 2A of the shock absorber 2, and the shock absorber support member 4 is sandwiched between two upper and lower cross members 3. Thereby, the shock absorbing material 2 is fixed to the cross member 3. In this embodiment, the distance L between the rear end surface 2A of the shock absorber 2 and the front end surface 3A of the cross member 3 is the wrap length.

  Moreover, as shown in FIG. 1, the side member 5 is provided in the right-and-left two places along the vehicle width direction in the rear-end surface 3B of the cross member 3. As shown in FIG. These two side members 5 are arranged at right angles to the cross member 3.

  One end of a rack 6 is fixed to the back surface of the bumper fascia 1, and the other end of the rack 6 is disposed toward the rear of the vehicle. The rack 6 has a plurality of teeth formed in the rear part thereof along the front-rear direction, and the plurality of teeth mesh with a gear 7 attached to the side member 5. The gear 7 is rotatable about the support shaft 8.

  The gear 7 is coupled with an arm 9 that is bent in a dogleg shape. At the normal time, the tip end 9 </ b> A side of the arm 9 is disposed in the vehicle width direction along the shock absorber support member 4. A roller 10 is rotatably attached to the tip 9A of the arm 9.

  In the present embodiment, the rack 6, the gear 7 and the arm 9 constitute a driving means.

  Next, the operation of this embodiment will be described with reference to FIG.

  When the vehicle collides with a collision object 11 such as a pedestrian, a gap G is formed between the back surface of the bumper fascia 1 and the shock absorber 2 as shown in FIG. Further, the distal end portion 9 </ b> A of the arm 9 is disposed in the vehicle width direction along the shock absorber support member 4.

  When the bumper fascia 1 collides with the collision object 11 (front collision), as shown in FIG. 3B, the bumper fascia 1 retreats in the direction of arrow A, and accordingly, the rack 6 moves in the direction of arrow B (rear of the vehicle). ) To rotate the gear 7 in the direction of arrow C. As the gear 7 rotates in the direction of arrow C, the arm 9 swings about the support shaft 8, and the roller 10 abuts against the shock absorber support member 4 to move the shock absorber 2 in the direction of arrow D (front of the vehicle). Push to. The shock absorber 2 is in close contact with the back surface of the bumper fascia 1. Thereby, the impact applied to the colliding object 11 at the time of the front collision is absorbed by the shock absorber 2, and the colliding object 11 can be protected from the impact.

  In FIG. 3, a one-dot chain line circle is a rotation trajectory of the roller 10 (the outer periphery of the roller 10) when there is no rack 6 or the like.

  According to the present embodiment, the shock absorbing material 2 is pushed forward of the vehicle by using the force when the bumper fascia 1 moves backward, and the shock absorbing material 2 is brought into contact with the back surface of the bumper fascia 1. The impact applied to the collision object 11 at the time of the front collision can be reduced with a simple configuration.

  FIG. 4 shows a comparison between the effect of the present invention and the effect of the conventional example. A gap G (about 10 mm) is provided between the bumper fascia 1 and the shock absorber 2 in order to absorb the assembly variation of the parts including the vehicle body (the rack 6 and the gear 7) and the dispersion of the individual parts. ing. Since this gap G exists, conventionally, as shown by the broken line in the figure, after the bumper fascia 1 collides with the collision object 11, the bumper fascia 1 is in contact with the shock absorbing material 2. It took time, and during this time, there was a dead time during which the collision object 11 was not protected.

  On the other hand, in the present invention, the shock absorber 2 is pushed out forward of the vehicle simultaneously with the retreat of the bumper fascia 1, so that even if there is a gap G, as shown by the solid line in the figure, the bumper fascia It does not take much time until 1 comes into contact with the shock absorber 2. That is, according to the present invention, as shown by the arrow E in the figure, the dead time for not protecting the collision object 11 can be greatly shortened.

  In FIG. 4, the range of the symbol F indicates that the idling time decreases, and the range of the symbol G indicates that the reaction force rising time of the shock absorber 2 decreases.

  FIG. 5 shows a second embodiment. In the present embodiment, as a driving means, a first rack 11 having one end fixed to the back surface of the bumper fascia 1 and the other end arranged rearward of the vehicle, and a first rack that is rotatably attached to the side member 5. 11, a gear 7 that meshes with 11, and a second rack 12 that has one end fixed to the shock absorber 2 (in this embodiment, the shock absorber support member 4) and the other end meshed with the gear 7.

  In the above configuration, the first rack 11 moves to the rear of the vehicle as the bumper fascia 1 moves backward at the time of a front collision, and the gear 7 rotates, and the second rack 12 moves to the front of the vehicle by the rotation of the gear 7. To push the shock absorber 2 forward of the vehicle. The shock absorber 2 is in close contact with the back surface of the bumper fascia 1. Thereby, the impact applied to the colliding object 11 at the time of the front collision is absorbed by the shock absorber 2, and the colliding object 11 can be protected from the impact.

  According to the present embodiment, since the reverse stroke amount of the first rack 11 and the forward stroke amount of the second rack 12 are equal at the time of the front collision, the gap G between the bumper fascia 1 and the shock absorber 2 is reduced. The shock absorber 2 can be brought into close contact with the back surface of the bumper fascia 1 at the midpoint.

  FIG. 6 shows a third embodiment. In this embodiment, as a driving means, a first rod 13 having one end attached to the back surface of the bumper fascia 1 and the other end arranged rearward of the vehicle, and one end of the shock absorber 2 (in this embodiment, shock absorption). A second rod 14 attached to the material support member 4) and having the other end disposed toward the rear of the vehicle, and the other end of the first rod 13 and the other end of the second rod 14 attached to the side member 5. And a connecting member 15 for connecting the two.

  One end of the first rod 13 is attached to the back surface of the bumper fascia 1 via a hinge 16, and one end of the second rod 14 is attached to the shock absorber support member 4 via a hinge 17.

  The central part of the connecting member 15 is rotatably attached to the side member 5 via a support shaft 18. The other end of the first rod 13 is attached to the connecting member 15 by a pin 19, and the other end of the second rod 14 is attached to the connecting member 15 by a pin 20.

  In the above configuration, when the bumper fascia 1 is retracted during the front collision, the first rod 13 moves rearward of the vehicle to rotate the connecting member 15 in the arrow H direction. The rod 14 moves forward of the vehicle and pushes the shock absorber 2 forward of the vehicle. The shock absorber 2 is in close contact with the back surface of the bumper fascia 1. Thereby, the impact applied to the colliding object 11 at the time of the front collision is absorbed by the shock absorber 2, and the colliding object 11 can be protected from the impact.

  According to the present embodiment, compared to the first and second embodiments, a rack and gears are unnecessary, and the configuration is simplified.

  FIG. 7 shows a fourth embodiment. In the present embodiment, as a driving means, a first cylinder device 21 and a second cylinder device 22 attached to the side member 5, a flow path 23 that connects the cylinders of both cylinder devices 21 and 22, and one end Is attached to the back surface of the bumper fascia 1, the other end is connected to the piston 21A of the first cylinder device 21, and one end is the shock absorber 2 (in this embodiment, the shock absorber support member 4). And a second rod 25 having the other end connected to the piston 22A of the second cylinder device 22 is provided.

  One end of the first rod 24 is attached to the back surface of the bumper fascia 1 through a hinge 26, and one end of the second rod 25 is attached to the shock absorber support member 4 through a hinge 27.

  In the above configuration, when the bumper fascia 1 moves backward in the front collision, the first rod 24 moves rearward of the vehicle and presses the piston 21A of the first cylinder device 21, and the pressing force is transmitted via the flow path 23. When the piston 22A of the second cylinder device 22 is driven by being transmitted to the second cylinder device 22, the second rod 25 moves forward of the vehicle and pushes the shock absorber 2 forward of the vehicle. The shock absorber 2 is in close contact with the back surface of the bumper fascia 1. Thereby, the impact applied to the colliding object 11 at the time of the front collision is absorbed by the shock absorber 2, and the colliding object 11 can be protected from the impact.

  According to the present embodiment, the moving speed of the second rod can be changed by adjusting the inner diameters of the first cylinder device 21 and the second cylinder device 22.

  FIG. 8 shows a fifth embodiment. In this embodiment, as a driving means, a female screw portion 3C formed on the cross member 3 at the front of the vehicle body, a male screw portion 28A formed on one end side, and the male screw portion 28A are screwed into the female screw portion 3C. A stay 28 having a ball screw 29 on the end side and two rods 30 having one end attached to the back side of the bumper fascia 1 and the other end connected to a nut portion 29A of the ball screw 29 are provided.

  In the above configuration, when the bumper fascia 1 moves backward in the front collision, the rod 30 moves rearward of the vehicle and presses the nut portion 29A of the ball screw 29, so that the nut portion 29A moves in the direction of arrow I. When the nut portion 29A moves in the direction of arrow I, the stay 28 rotates in the direction of arrow J. Further, the stay 28 moves in the direction of arrow K (front of the vehicle) by screwing the female screw portion 3C and the male screw portion 28A. The shock absorber 2 is pushed forward of the vehicle. The shock absorber 2 is in close contact with the back surface of the bumper fascia 1. Thereby, the impact applied to the colliding object 11 at the time of the front collision is absorbed by the shock absorber 2, and the colliding object 11 can be protected from the impact.

  Although the embodiments of the present invention have been described in detail with reference to the drawings, each of the above embodiments is only an example of the present invention, and the present invention is not limited only to the configuration of each of the above embodiments. . Needless to say, changes in design and the like within the scope of the present invention are included in the present invention.

It is a principal part block diagram of the shock absorber for vehicles by Example 1. FIG. It is sectional drawing along the SA-SA line of FIG. The operation | movement of the impact absorber for vehicles of FIG. 1 is demonstrated, (a) is a figure which shows the mode before a collision, (b) is a figure which shows the mode after a collision. It is a figure which shows the relationship between the reaction force at the time of a collision, and time. It is a principal part block diagram of the shock absorber for vehicles by Example 2. FIG. FIG. 6 is a main part configuration diagram of a vehicle shock absorber according to a third embodiment. FIG. 10 is a configuration diagram of a main part of a vehicle shock absorber according to a fourth embodiment. FIG. 10 is a configuration diagram of a main part of a vehicle shock absorber according to a fifth embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bumper fascia 2 Shock absorber 3 Cross member 3C Female thread part 4 Shock absorber support member 5 Side member 6 Rack 7 Gear 9 Arm 11 1st rack 12 2nd rack 13 1st rod 14 2nd rod 15 connection Member 21 First cylinder device 22 Second cylinder device 23 Flow path 24 First rod 25 Second rod 28 Stay 28A Male thread portion 29 Ball screw 29A Nut portion 30 Rod G Gap

Claims (7)

A shock absorber disposed on the back side of the bumper fascia with a gap between the bumper fascia,
Drive means that pushes the shock absorbing material forward of the vehicle using the retreating force when the bumper fascia retreats at the time of a front collision, and abuts the shock absorbing material against the back surface of the bumper fascia. A vehicle shock absorber.   2. The impact absorbing device for a vehicle according to claim 1, wherein the impact absorbing material is disposed so as to overlap a cross member at a front portion of a vehicle body. The drive means has one end attached to the back side of the bumper fascia and the other end arranged toward the rear of the vehicle, a gear that is rotatably attached to a side member and meshes with the rack, and is connected to the gear. With a swingable arm around the gear,
The rack moves to the rear of the vehicle as the bumper fascia retreats at the time of a front collision, and rotates the gear, and the arm swings by pushing the gear to push the shock absorber forward. The impact absorbing device for a vehicle according to claim 1 or 2, characterized by the above. The driving means includes a first rack having one end attached to the back side of the bumper fascia and the other end arranged toward the rear of the vehicle, a gear rotatably attached to a side member and meshing with the first rack; A second rack having one end fixed to the shock absorber and the other end meshing with the gear;
When the bumper fascia moves backward in the front collision, the first rack moves rearward of the vehicle and rotates the gear, and the rotation of the gear moves the second rack forward of the vehicle and absorbs the shock. The vehicle impact absorbing device according to claim 1 or 2, wherein the material is pushed forward of the vehicle. The drive means includes a first rod having one end attached to the back side of the bumper fascia and the other end arranged rearward of the vehicle, and one end attached to the shock absorber and the other end arranged rearward of the vehicle. A second rod, and a connecting member rotatably attached to a side member and connecting the other end of the first rod and the other end of the second rod,
As the bumper fascia moves backward during a front collision, the first rod moves rearward of the vehicle to rotate the connecting member, and the second rod moves forward of the vehicle by the rotation of the connecting member. The vehicle impact absorbing device according to claim 1 or 2, wherein the impact absorbing material is pushed forward of the vehicle. The driving means includes a first cylinder device and a second cylinder device attached to a side member, a flow path connecting the cylinders of the two cylinder devices to each other, and one end attached to the back surface of the bumper fascia. A first rod having an end connected to the piston of the first cylinder device, and a second rod having one end attached to the shock absorber and the other end connected to the piston of the second cylinder device. Prepared,
As the bumper fascia moves backward during a front collision, the first rod moves rearward of the vehicle and presses the piston of the first cylinder device, and the pressing force is applied to the second through the flow path. The first rod is moved to the front of the vehicle by pushing the piston of the second cylinder device by being transmitted to the cylinder device, and pushes out the shock absorbing material to the front of the vehicle. Or a shock absorber for a vehicle according to 2; The driving means includes a female screw portion formed on the cross member at the front of the vehicle body, a male screw portion formed on one end side, the male screw portion screwing into the female screw portion, and a ball screw provided on the other end side. And a rod having one end attached to the back side of the bumper fascia and the other end connected to the nut portion of the ball screw,
When the bumper fascia retreats at the time of a front collision, the rod moves to the rear of the vehicle and presses the nut portion of the ball screw, so that the stay rotates around its axis, while the female screw portion and the male screw portion 3. The vehicle impact absorbing device according to claim 1, wherein the rotating stay moves forward of the vehicle and pushes the impact absorbing material forward of the vehicle.

Images