JP2005324654A - Body front structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform energy absorption with an appropriate reaction force level immediately after a collision with a pedestrian's lower limb, and at the time of rebound, the front part of a vehicle body that can surely jump up the lower leg and effectively suppress the knee bending Provide structure.
A bumper impact absorbing member 11 is provided at a collision load input portion of a bumper reinforcement 1, and a spoiler impact absorbing member 12 is provided at a collision load input portion of a spoiler reinforcement 2, and a spoiler reinforcement. 2 is provided with a front / rear position control means 15 for pushing the reaction force generation mechanism 14 against the input load and the spoiler reinforcement 2 forward of the vehicle body, so that when the vehicle body front end collides with a pedestrian's lower limb, the spoiler The reinforcement 2 is pushed forward in the vehicle body with a reaction force by the reaction force generation mechanism 14 and the pedestrian's lower leg part is flipped up in a direction away from the vehicle to prevent an increase in curvature at the knee position of the pedestrian.
[Selection] Figure 2

Description

  The present invention relates to a vehicle body front structure, and more particularly to a vehicle body front structure provided with a spoiler reinforcement disposed below a bumper reinforcement.

  A bumper portion extending in the vehicle width direction is provided at the front end portion of the vehicle, but there is a bumper portion provided with a spoiler portion (lower protruding portion) below, and an impact is applied to the front ends of the bumper portion and the spoiler portion. An absorbing member is provided to provide a buffer function at the time of a frontal collision.

In this case, the lower shock absorbing member provided in the spoiler part is set to be stronger than the upper shock absorbing member provided in the bumper part, and the lower shock absorbing member absorbs the shock when the front side of the vehicle collides with a pedestrian. However, the pedestrian's lower leg (lower knee) is flipped up, leading the pedestrian to the hood without being caught under the vehicle body, thereby reducing damage to the pedestrian's knee joint. (For example, refer to Patent Document 1).
JP 2002-274430 A (3rd page, FIG. 1)

  However, in a general vehicle pedestrian accident with a spoiler, the lower limbs collide with the front part of the vehicle at the beginning of the collision, and then the upper body moves along the front structure of the vehicle. At that time, the lower leg part is decelerated by the reaction force of the bumper part and spoiler part, while the upper leg part above the knee moves along the front structure of the vehicle. Slower against. As a result, a change in relative position occurs between the lower leg and upper leg, and the entire lower leg is in a deformation mode that is largely curved around the knee.

  On the other hand, in the conventional vehicle body front part structure shown in Patent Document 1, the knee bending deformation mode can be reduced. The function of reducing the curvature of the knee is achieved in synchronization with the rearward movement.

  In order to effectively raise the lower leg part, it is ideal that the upper leg part and the lower leg part are in conflicting movements around the knee in the second half of the collision. This is achieved by making the deformation amount of the inner spoiler part smaller than that of the bumper part.

  However, such conventional technology focuses only on the energy absorption stroke and does not consider the reaction force control during rebound. As a result, the absolute deformation difference between the bumper and spoiler is used to rebound. Sometimes, the spoiler part is positioned in front of the vehicle body relative to the bumper part to achieve the lower limb flip-up mode.

  In order to achieve such characteristics, it is necessary to increase the rigidity of the spoiler part relative to the rigidity of the bumper part, which may increase the reaction force in the spoiler part. Therefore, the bumper part needs to be deformed to a relatively optimal position, so that it has a flexible structure, affecting the pedestrian's damage resistance performance, and using the spring element of the shock absorbing member mainly to absorb the shock. Therefore, the initial deceleration does not rise steeply, so it takes time to generate a sufficient reaction force, and in the phenomenon that occurs in a short time at the time of collision, the effect of raising the lower leg is sufficiently obtained I can't.

  Accordingly, the present invention is a vehicle body that absorbs energy at an appropriate reaction force level immediately after a collision with a pedestrian's lower limb, and can effectively curb the knee part by repelling the lower leg part reliably during rebound. A front structure is provided.

  According to the present invention, a bumper reinforcement that extends in the vehicle width direction at the front end of the vehicle body and a spoiler reinforcement that is positioned below the bumper reinforcement and extends in the vehicle width direction are provided. A bumper impact absorbing member is provided at the force impact load input portion, and a spoiler impact absorbing member is provided at the spoiler rain force impact load input portion. The main feature is that a front / rear position control means for pushing the reaction force generation mechanism and the spoiler reinforcement to the front of the vehicle body is provided.

  According to the present invention, when the front end of the vehicle body collides with a pedestrian's lower limb, the spoiler part shock absorbing member interferes with the pedestrian's lower leg part, and the bumper part shock absorbing member interferes with the pedestrian's knee part. Thus, reaction force is generated in the lower leg and knee while absorbing the collision energy by the respective impact absorbing members.

  The load is transmitted to the spoiler reinforcement by the bottom of each impact absorbing member, and the spoiler reinforcement is pushed forward by the front and rear position control means with the reaction force by the reaction force generation mechanism, The lower leg part is flipped up in the direction away from the vehicle, and the knee part moment applied by the movement of the upper leg part is offset by the jumping movement of the lower leg part, thereby preventing an increase in curvature at the knee position.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  1 to 7 show a first embodiment of a vehicle body front part structure according to the present invention, FIG. 1 is a perspective view schematically showing the vehicle body front part structure, FIG. 2 is a longitudinal sectional view of the vehicle body front part, and FIG. Is a longitudinal sectional view schematically showing the detailed structure of the spoiler part, FIG. 4 is a schematic view showing the reaction force characteristics of the spoiler part, and FIG. 5 shows the impact modes at the time of a pedestrian collision in order from (a) to (c). FIG. 6 is a schematic diagram illustrating the reaction force characteristics of the bumper part and the spoiler part, and FIG. 7 illustrates the operation of this embodiment according to (a) to (c). It is a schematic diagram shown in comparison.

  The vehicle body front portion structure of the first embodiment includes a bumper reinforcement 1 extending in the vehicle width direction at the front end portion of the vehicle body as shown in FIGS. 1 and 2, and a vehicle positioned below the bumper reinforcement 1. And a spoiler reinforcement 2 extending in the width direction. The bumper reinforcement 1 has bumper stays 4 at the front ends of a pair of left and right side members 3 extending in the vehicle longitudinal direction on both sides in the vehicle width direction of the front portion of the vehicle body. The spoiler reinforcement 2 is connected to the first cross member 5 coupled to the lower side of the front end portion of the side member 3 via a spoiler stay 6, and the spoiler reinforcement 2 has a collision load. Is provided with a spoiler control means 10 that pushes the spoiler reinforcement 2 forward of the vehicle body during rebound while absorbing energy with a large reaction force at the time of input. That.

  As shown in FIG. 2, a bumper impact absorbing member 11 is provided at a collision load input portion (front end surface) of the bumper reinforcement 1, and a spoiler portion is provided at a collision load input portion (front end surface) of the spoiler reinforcement 2. An impact absorbing member 12 is provided, and the front side of each of the impact absorbing members 11 and 12 is entirely covered with a bumper fascia 13. In FIG. 2, Wf is a front wheel.

  The bumper reinforcement 1 is a bumper part B including a bumper part impact absorbing member 11, and the spoiler reinforcement 2 is a spoiler part S including a spoiler part impact absorbing member 12.

  As shown in FIG. 3, the spoiler control means 10 is a front-rear position for pushing the reaction force generating mechanism 14 against the input load and the spoiler reinforcement 2 forward of the vehicle body to the spoiler stay 6 as a vehicle body side attachment portion of the spoiler reinforcement 2. Control means 15 is provided.

  Further, the spoiler part impact absorbing member 12 is made thinner than the bumper part impact absorbing member 11 to reduce its energy absorption amount.

  The front / rear position control means 15 is incorporated in a spoiler stay 6 interposed between the spoiler reinforcement 2 and the first cross member 5, and is configured as a cylinder device 20 that pushes the bumper reinforcement forward of the vehicle body by introducing high-pressure fluid pressure. .

  The cylinder device 20 includes a cylinder main body 21 constituted by a hollow spoiler stay 6 itself, a piston 22 slidably fitted into a rear inner portion of the cylinder main body 21 with an airtight structure via a piston ring 22a, A piston rod 24 projecting forward of the cylinder body 21 from a flange portion 23 movably fitted to the front inside of the body 21 is provided, and the spoiler reinforcement 2 is coupled to the front end of the piston rod 24.

  A pressure chamber 25 sealed between the piston 22 and the rear end wall 21a is formed inside the rear portion of the cylinder body 21, and the pressure chamber 25 is attached to the center of the rear end wall 21a. The gas discharge port 26a of the inflator 26 is faced, the pressure chamber 25 is expanded by the gas pressure generated by the inflator 26, and the piston 22 is instantaneously moved forward (leftward in the figure).

  The cylinder device 20 maintains a cylinder internal pressure after introducing a high-pressure fluid pressure at a substantially constant pressure, and pressure as a moving reaction force holding means for controlling the reaction force when the spoiler reinforcement 2 moves forward substantially constant. A valve 27 is provided.

  The pressure valve 27 is provided on the rear end wall 21a so as to face the pressure chamber 25, and adjusts the pressure in the pressure chamber 25 that is expanded by the gas pressure of the inflator 26 to a substantially constant pressure.

  Further, as shown in FIG. 2, the front / rear position control means 15 receives a load detection sensor 28 as a collision load detection means input to the bumper reinforcement 1 and a collision detection signal from the load detection sensor 28 to receive a spoiler reinforcement. And a timing control means 29 for controlling the timing of moving 2 forward.

  That is, the load detection sensor 28 is connected to the inflator 26 via the timing control means 29, and when a predetermined load is input to the bumper reinforcement 1, the detection signal is sent to the inflator at a timing preset by the timing control means 29. The inflator 26 generates high pressure gas and supplies it to the pressure chamber 25.

  Further, as shown in FIG. 3, the reaction force generation mechanism 14 is incorporated in the cylinder main body 21 and is made of a honeycomb-like member interposed between the piston 22 and the flange 23, or a light alloy or resin. The cushioning member 30 is made of a foam material.

  The shock-absorbing member 30 is formed in a single piece with a predetermined thickness along the inner shape of the cylinder main body 21, and a large number of the single pieces are stacked to fill the space between the piston 22 and the flange 23.

  When the inflator 26 is operated, the piston 22 instantaneously moves forward, and the pressing force is transmitted to the flange portion 23 and the piston rod 24 via the buffer member 30, and the piston rod 24 causes the spoiler rain. The force 2 is pushed forward of the vehicle body.

  Between the flange 23 and the front end wall 21b of the cylinder body 21, a resin cushioning material 31 for preventing excessive pushback is interposed.

  The reaction force characteristics of the reaction force generation mechanism 14 are as follows. By selecting the material of the buffer member 30 as shown in FIG. It is set so that the substantially constant reaction force is maintained (B portion) until the bumper shock absorbing member 11 of the force 1 is bottomed (C portion). In the figure, the reaction force characteristic of the conventional spoiler is shown by a broken line.

  With the above configuration, according to the present embodiment, as shown in FIG. 5, when the front end of the vehicle body collides with the lower limb L of the pedestrian, the spoiler shock absorbing member 12 interferes with the lower leg L1 of the pedestrian, and the bumper The impact-absorbing member 11 interferes with the pedestrian's knee Lk, and a reaction force is generated in the lower leg Ll and knee Lk while absorbing impact energy by the impact-absorbing members 12 and 11. .

  When the impact absorbing member 12 bottoms out, a load is transmitted to the spoiler reinforcement 2, and the spoiler reinforcement 2 is caused to react with the spoiler reinforcement 2 by the front / rear position control means 15 (see FIG. 3). While pushing the vehicle body forward, the pedestrian's lower leg L1 is moved away from the vehicle, that is, the vehicle jumps forward, and the moment of the knee Lk applied by the movement of the upper leg Lu due to the movement of the lower leg Ll is increased. This cancels out and prevents an increase in curvature at the knee position.

  That is, when an external force is input to the bumper facer 13, the load is transmitted to the bumper reinforcement 1 and the spoiler reinforcement 2 via the bumper impact absorbing member 11 and the spoiler impact absorbing member 12.

  In the initial stage of the collision, the spoiler part impact absorbing member 11 is set to have a smaller amount of impact energy absorption than the bumper part impact absorbing member 12, so that it quickly bottoms out and the load is quickly transmitted to the spoiler reinforcement 2. As described above, since the load is transmitted to the spoiler reinforcement 2 and the piston rod 24 (see FIG. 3) which have a mass with respect to the lower limb L and become a strength member, the deceleration of the lower limb L is as if it is a rigid body. Stand up suddenly like a collision.

  However, since the buffer member 30 disposed at the rear end of the piston rod 24 is crushed and deformed by the transmitted load, the spoiler portion S moves backward with respect to the vehicle as the buffer member 30 is crushed.

  As a result, the spoiler part S immediately raises a reaction force after the collision, and then deforms under a constant reaction force as shown in FIG. 6 by the reaction force generation mechanism 14 using the buffer member 30 so as to be substantially rectangular. Perform shock absorption characteristics of the shape.

  Also, since the reaction force of the spoiler part B rises faster than the bumper part B, the lower leg Ll is decelerated with respect to the knee part Lk, and a mode that can reduce the curvature of the knee part Lk at the initial stage of the collision is realized. it can.

  In addition, when the collision speed V is high at the time of pedestrian collision, the deformation of the bumper part impact absorbing member 11 increases, and the reaction force of the bumper part B increases correspondingly. The knee portion Lk is suddenly decelerated and moves to rebound.

  The increase in the reaction force at this time is detected by the load detection sensor 28, and the inflator 26 provided in the cylinder body 21 of the front / rear position control means 15 is operated to push out the spoiler reinforcement 2 to the lower leg Ll. Speed is applied in the direction of repulsion from the vehicle, and the lower leg Ll is flipped up, and the moment of the knee Lk is offset by the jumping-up movement, thereby preventing an increase in curvature at the knee position.

  Therefore, in this embodiment, since it has the front-rear position control means 15 that can quickly move the lower leg Ll forward in the second half of the collision, the time and amount of deformation for absorbing the shock in the first half of the collision can be taken more than before. As a result, the reaction force level can be lowered to an optimum level.

  For this reason, in the present embodiment, much of the impact energy that had to be borne by the bumper part B can be absorbed by the spoiler part B in the present embodiment, and a more balanced impact absorption becomes possible.

  Further, in the present embodiment, when an excessive external force such as a collision with the vehicle is input, the reaction force increases as the spoiler reinforcement 2 bottoms on the spoiler stay 6 and acts as a load transmission path to the vehicle body frame. . At this time, the spoiler part S at the time of an excessive load input can be obtained from the prior art by configuring the parts other than the intentionally deformed parts such as the spoiler part impact absorbing member 12 and the reaction force generating mechanism 14 with a large rigidity. Can also provide a vehicle body front structure that acts as a strong load transmission path and has excellent collision safety performance.

  In the vehicle body front part structure of the present embodiment, when the lower limb L of the pedestrian collides with the bumper part B and the spoiler part S as shown in FIG. 7 (a), the knee part Lk and the lower leg part as shown in FIG. 7 (b). Ll is optimally absorbed by the bumper part B and the spoiler part S, and the upper leg Lu curves from the knee part Lk to the hood edge part F as shown in (c), but the spoiler part S moves forward. As a result, the lower leg L1 jumps forward, and the bending moment of the upper leg Lu is offset.

  On the other hand, when the lower leg L of the pedestrian collides with the bumper part B and the spoiler part S as shown in FIG. 7 (d), the bumper part B with which the knee part Lk interferes as shown in FIG. The spoiler part S having a large deformation amount and a small reaction force and interfering with the crus L1 has a small deformation amount and a correspondingly large reaction force. As shown in FIG. Even when Lu is curved in the direction of the hood edge portion F, it is not possible to obtain the effect of raising the lower leg Ll.

  By the way, in addition to the said effect in this embodiment, since the said spoiler part impact-absorbing member 12 made the energy absorption amount smaller than the said bumper part impact-absorbing member 11, the load input into the spoiler part S is after a collision. Immediately after transmitting the load to the spoiler reinforcement 2, the reaction force generation mechanism 14 provided in the spoiler stay 6 can be effectively operated. In addition, since the spoiler part S has a relatively fast deceleration rising relative to the bumper part B, the collision speed of the crus Ll is relatively low with respect to the knee part Lk at the time of a collision with a pedestrian. Immediately after that, the behavior of raising the lower leg Ll is realized.

  The front / rear position control means 15 controls the load detection sensor 28 that detects the collision load input to the bumper reinforcement 1 and the timing for moving the spoiler reinforcement 2 forward in response to the collision detection signal of the load detection sensor 28. Timing control means 29 for controlling the front / rear position control means 15 according to the load input to the bumper part B, that is, the timing for operating the inflator 26 can be accurately controlled. L1 can be effectively raised up.

  Further, the reaction force characteristics of the reaction force generation mechanism 14 are as shown in FIG. 4 until the bumper part impact absorbing member 11 of the bumper reinforcement 1 is bottomed after rising to a substantially constant reaction force when a collision load is input. Since the substantially constant reaction force is maintained, the reaction force characteristic becomes a substantially rectangular graph, and an optimum reaction force level can be obtained, and the shock absorption in the spoiler portion S is most efficient. The shock can be effectively absorbed immediately after the collision by increasing the rise of the load.

  Furthermore, since the reaction force generation mechanism 14 is formed by the cushioning member 30 made of a honeycomb-shaped member or a foam material made of a light alloy or resin, it is possible to easily obtain an optimum reaction force characteristic with a simple structure. Can do.

  Further, the front / rear position control means 15 is composed of a cylinder device 20 that is interposed between the spoiler reinforcement 2 and the first cross member 5 and pushes the bumper reinforcement 2 forward of the vehicle body by introducing high-pressure gas pressure. It is possible to generate a large pressing force that pushes the spoiler reinforcement 2 ahead of the load received from the portion Ll, and thus it is possible to surely raise the lower leg Ll.

  Furthermore, the cylinder device 20 is provided with a pressure valve 27 that maintains the cylinder internal pressure after introducing the high-pressure gas pressure at a substantially constant pressure and controls the reaction force when moving the spoiler reinforcement 2 forward. Therefore, it is possible to easily generate a substantially rectangular reaction force characteristic in which the reaction force when the lower leg Ll is flipped up by the spoiler portion S is made constant.

  FIG. 8 shows a second embodiment of the present invention, in which the same components as those in the first embodiment are denoted by the same reference numerals and redundant description is omitted, and FIG. 8 schematically shows the detailed structure of the spoiler part. FIG.

  The vehicle body front structure of the second embodiment basically has the same configuration as that of the first embodiment, and a spoiler stay in which the front / rear position control means 15a is interposed between the spoiler reinforcement 2 and the first cross member 5. 6 is configured as a cylinder device 20a that pushes the bumper reinforcement 2 forward of the vehicle body by introducing a high-pressure gas pressure from the inflator 26.

  The present embodiment is particularly different from the first embodiment in that the reaction force generation mechanism 14a is interposed between the spoiler reinforcement 2 and the cylinder device 20a on the vehicle body side and buckled when a collision load is input. The hollow member 32 is formed with a bead portion 32a serving as a deformation starting point.

  By the way, as shown in FIG. 8, the cylinder device 20 a connects the piston 22 disposed inside the rear of the cylinder body 21 and the flange 33 disposed inside the front with a rod 34, and the flange 33 is connected to the cylinder body 21. It can protrude from the front end.

  The flange portion 33 is normally locked by a stopper 35 penetrating the cylinder body 21 and is driven by receiving a signal from a load detection sensor 28 (see FIG. 2) provided in the bumper portion B at the time of a collision. The stopper 36 is released by the actuator 36. In addition, a cushioning material 31 a that prevents pushback is fixed to the inner periphery of the front end of the cylinder body 21.

  In the pressure chamber 25 formed between the piston 22 and the rear end wall 21a, an inflator 26 and a pressure sensor 27 are provided in the same manner as in the first embodiment, and a load detection sensor 28 provided in the bumper portion B is provided. Is input to the inflator 26 via the timing control means 29 (see FIG. 3).

  In the cylinder device 20a thus formed, the rear end of the hollow member 32 constituting the reaction force generating mechanism 14a is integrally coupled to the front end surface of the flange portion 33, and a spoiler is connected to the front end of the hollow member 32. Reinforce 2 is combined.

  Therefore, according to the second embodiment, when a collision occurs in the front part of the vehicle body as in the first embodiment, the inflator 26 operates to introduce the high-pressure gas pressure into the pressure chamber 25, and the piston 22 and this The heel 33 is protruded forward by releasing the stopper 35 so that the spoiler reinforcement 2 is pushed forward through the hollow member 32 so that the lower leg Ll of the pedestrian is flipped up. It has become.

  At this time, the hollow member 32 is buckled and crushed by the input load from the bead portion 23a to generate an appropriate reaction force. The reaction force characteristic at this time is shown in FIG. It is set in advance so that the rectangular characteristics shown can be obtained.

  As described above, in this embodiment, the reaction force generation mechanism 14a is formed by the hollow member 32, and the hollow member 32 is disposed outside the cylinder device 20a. Therefore, the configuration of the cylinder device 20a is compared with that of the first embodiment. And can be simplified.

  9 and 10 show a third embodiment of the present invention. The same components as those in the first and second embodiments are denoted by the same reference numerals and redundant description is omitted. FIG. 9 is a spoiler. FIG. 10 is a reaction force characteristic diagram using a spring.

  The vehicle body front structure of the third embodiment basically has the same configuration as that of the first embodiment, but particularly different from the first and second embodiments, as shown in FIG. A spring urging device 40 that interposes the means 15b between the spoiler reinforcement 2 and the first cross member 5 (see FIG. 1) on the vehicle body side and pushes the bumper reinforcement 2 forward by the spring reaction force of the spring 41. It is formed by.

  The spring 41 is used in a large displacement region with respect to the spring natural length and includes a plurality of springs arranged in parallel with each other.

  That is, the spring urging device 40 includes a bottomed cylindrical cylinder main body 42 provided with a rear end wall 42a. A piston 43 is slidably disposed in the rear of the cylinder main body 42, and the cylinder main body 42 is provided. A flange portion 44 is disposed inside the front of the piston 43 and the piston 43 and the flange portion 44 are connected by a plurality of rods 45.

  Further, an intermediate wall 46 through which the rod 45 is slidably passed is fixed to the intermediate portion of the cylinder body 42 in the front-rear direction, and between the intermediate wall 46 and the flange portion 44, each intermediate wall 46 is fixed. A plurality of springs 47 are arranged in a compressed state by being fitted on the rod 45, and an urging force in the extending direction of these springs 47 is applied to the flange portion 44. The intermediate wall 46 has a function of limiting the forward movement amount of the piston 43, and a cushioning material 31b for preventing pushback is provided on the rear surface thereof.

  The flange portion 44 is locked by a stopper 48 penetrating the cylinder body 42 as in the second embodiment, and receives a signal from the load detection sensor 28 (see FIG. 2) provided in the bumper portion B at the time of collision. The stopper 48 is unlocked by the electric actuator 49 that is driven.

  Further, in this embodiment, the reaction force generation mechanism 14b is formed in a columnar shape with a light alloy foam material 50, and the rear end of the columnar foam material 50 is integrally coupled to the front end surface of the flange portion 44, and A spoiler reinforcement 2 is connected to the front end.

  Therefore, according to the third embodiment, when a collision occurs at the front part of the vehicle body as in the first embodiment, the electric actuator 49 is operated and the stopper 48 releases the locking of the flange portion 44. The heel 44 is moved forward by the urging force of the spring 41 to push the spoiler reinforcement 2 together with the columnar foam material 50 forward, so that the lower leg Ll of the pedestrian is flipped up.

  At this time, the columnar foam material 50 generates a reaction force while being crushed by an input load. However, even in the reaction force characteristic in this case, the columnar foam material 50 is set in advance so as to obtain the rectangular characteristic shown in FIG. is there.

  Thus, in this embodiment, since the spring 41 is used to push out the spoiler reinforcement 2, it is not necessary to use an inflator as in the first and second embodiments, so the configuration of the front / rear position control means 15b is simpler. Can be

  Further, since the spring 41 is used in a large displacement region with respect to the natural length of the spring and includes a plurality of the springs arranged in parallel with each other, a spring reaction force in which the influence of the displacement amount is reduced can be used. It becomes easy to obtain the rectangular reaction force characteristic shown in FIG. 10, and the spring region used at this time is the P section shown in FIG.

  By the way, the vehicle body front structure of the present invention has been described by taking the first to third embodiments as examples, but the present invention is not limited to these embodiments, and various other embodiments are adopted without departing from the gist of the present invention. can do.

1 is a perspective view schematically showing a vehicle body front portion structure in a first embodiment of the present invention. It is a longitudinal cross-sectional view of the vehicle body front part in 1st Embodiment of this invention. It is a longitudinal cross-sectional view which shows typically the detailed structure of the spoiler part in 1st Embodiment of this invention. It is a schematic diagram which shows the reaction force characteristic of the spoiler part in 1st Embodiment of this invention. It is explanatory drawing which shows the impact mode at the time of the pedestrian collision in 1st Embodiment of this invention later on to (a)-(c). It is the schematic diagram which wrote together the reaction force characteristic of the bumper part and spoiler part in 1st Embodiment of this invention. It is a schematic diagram which shows the effect | action of this embodiment by (a)-(c) compared with the conventional (d)-(f). It is a longitudinal cross-sectional view which shows typically the detailed structure of the spoiler part in 2nd Embodiment of this invention. It is a longitudinal cross-sectional view which shows typically the detailed structure of the spoiler part in 3rd Embodiment of this invention. It is a reaction force characteristic view using a spring in a 3rd embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bumper reinforcement 2 Spoiler reinforcement 10 Spoiler control means 11 Bumper part impact-absorbing member 12 Spoiler part impact-absorbing member 14, 14a, 14b Reaction force generation mechanism 15, 15a, 15b Front-rear position control means 20 Cylinder apparatus 27 Pressure valve (movement) Reaction force holding means)
28 Load detection means (impact load detection means)
29 Timing control means 30 Buffer member 32 Hollow member 32a Bead part 40 Spring urging device 41 Spring

Claims (11)

In a vehicle body front structure comprising a bumper reinforcement that extends in the vehicle width direction at the front end of the vehicle body, and a spoiler reinforcement that is positioned below the bumper reinforcement and extends in the vehicle width direction.
A vehicle body front structure characterized in that the spoiler reinforcement is provided with a spoiler control means that pushes the spoiler reinforcement to the front of the vehicle body while absorbing energy when a collision load is input. In a vehicle body front structure comprising a bumper reinforcement that extends in the vehicle width direction at the front end of the vehicle body, and a spoiler reinforcement that is positioned below the bumper reinforcement and extends in the vehicle width direction.
A bumper part impact absorbing member is provided at the bumper reinforcement impact input part, and a spoiler impact absorbing member is provided at the spoiler reinforcement input part.
A vehicle body front structure characterized in that a reaction force generation mechanism against an input load and a front / rear position control means for pushing the spoiler reinforcement to the front of the vehicle body are provided at a vehicle body side attachment portion of the spoiler reinforcement.   The vehicle body front part structure according to claim 2, wherein the spoiler part impact absorbing member has a smaller amount of energy absorption than the bumper part impact absorbing member.   The front-rear position control means comprises a collision load detection means input to the bumper reinforcement, and a timing control means for controlling the timing of moving the spoiler reinforcement forward in response to a collision detection signal of the detection means. The vehicle body front part structure according to claim 2 or 3, characterized by the above.   The reaction force characteristic of the reaction force generation mechanism is that after starting up to a substantially constant reaction force when a collision load is input, the bumper reinforcement of the bumper reinforcement maintains the substantially constant reaction force until it bottoms out. The vehicle body front part structure according to any one of claims 2 to 4.   The vehicle body front structure according to any one of claims 2 to 5, wherein the reaction force generation mechanism is formed of a honeycomb-shaped member or a buffer member made of a foam material made of a light alloy or a resin. .   7. The front / rear position control means is a cylinder device that is interposed between the spoiler reinforcement and the vehicle body side and pushes the bumper reinforcement forward of the vehicle body by introducing a high-pressure fluid pressure. The vehicle body front structure described in one.   The cylinder device is provided with a movement reaction force holding means for holding the cylinder internal pressure after introducing the high-pressure fluid pressure at a substantially constant pressure and controlling the reaction force when moving the spoiler reinforcement forward. The vehicle body front part structure according to claim 7.   The reaction force generation mechanism is a hollow member that is interposed between the spoiler reinforcement and the vehicle body side and has a bead portion that becomes a buckling deformation starting point when a collision load is input. The vehicle body front part structure as described in any one.   The front / rear position control means is a spring urging device that is interposed between the spoiler reinforcement and the vehicle body side and pushes the bumper reinforcement forward by the spring reaction force of the spring. Body front structure. The vehicle body front part structure according to claim 10, wherein the spring is used in a large displacement region with respect to a spring natural length and includes a plurality of springs arranged in parallel to each other.

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