JP5983072B2 - Auto body front structure - Google Patents

Description

  The present invention relates to a front body structure of a vehicle equipped with a collision detection sensor for detecting a vehicle collision and operating a safety device such as an airbag.

  In order to deploy an airbag at the time of a vehicle collision, it is common to provide a collision detection sensor that detects an impact at the time of the vehicle collision. At this time, a structure is known in which a generally rectangular member is used when viewed from the front-rear direction of the vehicle, and a collision detection sensor is attached to the center of the upper member extending in the vehicle width direction. (See, for example, Patent Document 1).

  Thus, at the time of a frontal collision of the vehicle, not only the collision mode (center collision, pole collision) in which the central part in the vehicle width direction receives an impact by a pole-shaped obstacle such as a utility pole, but also one side in the vehicle width direction is obstructed by the obstacle Even in a collision mode (offset collision) that receives an impact, the collision detection sensor can detect the collision of the vehicle via a quadrangular member.

JP 2003-63445 A

  However, the above-described conventional vehicle body front structure requires a quadrangular member, which increases the structure and causes an increase in vehicle weight.

  In order to prevent this, in order to be able to cope with an offset collision without using a square member, a collision detection sensor is provided on each of the pair of left and right side members extending in the vehicle longitudinal direction on both sides in the vehicle width direction. It is possible to install. However, in this case, collision detection at the center in the vehicle width direction becomes insufficient, and two collision detection sensors are required on the left and right, resulting in an increase in cost.

  Therefore, the present invention provides a vehicle body front structure that can detect a collision with higher sensitivity even in a form in which an obstacle collides with a vehicle width direction central portion and one side in the vehicle width direction with a simpler structure. It is aimed.

  In the vehicle body front structure according to the present invention, a pair of left and right side members are provided along the vehicle front-rear direction on both sides in the vehicle width direction of the front end of the vehicle body, a front panel is provided above the side member, and the side members and A pair of left and right stays that bridge the front panel are provided, and a bar that extends along the vehicle width direction and connects the pair of left and right stays is provided. A collision detection sensor is provided for detecting a vehicle collision by relative movement along. And the lower end of the said stay is attached to the upper surface of the said side member.

  According to the vehicle body front structure of the present invention, since it is not necessary to provide two collision detection sensors on the left and right, the structure is simpler. Further, even when the obstacle collides with the center in the vehicle width direction and one side in the vehicle width direction, the collision can be detected with higher sensitivity. That is, in the case of an offset collision in which an obstacle collides with one side in the vehicle width direction at the front end of the vehicle, the stay on one side collapses in the front-rear direction, the bar moves obliquely backward, and the collision detection sensor also moves backward. In the case of a center collision in which an obstacle collides with the center in the vehicle width direction at the front end of the vehicle and in the case of a full wrap collision, the stays on the left and right sides are crushed while the collision detection sensor moves backward together with the bar.

1 is a perspective view showing a front end of a vehicle according to an embodiment of the present invention. It is a perspective view of the vehicle front end which shows the state which removed the front bumper from FIG. FIG. 3 is an exploded perspective view of FIG. 2. It is the disassembled perspective view which expanded the principal part of FIG. It is a side view of the stay by the embodiment of the present invention. It is the side view which looked at FIG. 2 from the vehicle left side.

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

  As shown in FIG. 1, a front bumper 3 extending along the vehicle width direction is disposed at the lower part of the front end of the vehicle 1. A grille 5 is provided at the center of the front bumper 3 in the vehicle width direction, and headlamps 7 are disposed at both left and right ends of the grille 5. When the vehicle is traveling, traveling wind flows from the grill 5 into the front space 9 of the vehicle. Further, on the rear side of the grill 5 of the front bumper 3, a bar 11 shown in FIG.

  As shown in FIGS. 2 and 3, a front panel 13 (dash panel) is disposed along the vehicle width direction and the vertical direction at the upper part of the front portion of the vehicle. As shown in FIGS. 2 and 3, below the front panel 13, a pair of left and right side members 15 are extended along the vehicle front-rear direction on the left and right sides in the vehicle width direction. Further, a cross member 17 extending in the vehicle width direction is coupled to the front portion of the side member 15, and a bumper reinforcement 19 extending in the vehicle width direction is disposed on the front side of the side member 15. ing. On both sides of the front panel 13 in the vehicle width direction, a pair of left and right stay mounting portions 23 and 24 for attaching the stay 21 are formed.

  As shown in FIGS. 2, 3, 4 and 5, the stay 21 is extended along the vehicle front-rear direction as viewed from the side, and the tongue pieces 25 and 27 at the rear end thereof are stay mounting portions of the front panel 13. The upper leg portion 29 attached to the upper and lower leg portions 24, the central leg portion 31 extending downward from the front end of the upper leg portion 29, and the lower end of the central leg portion 31 from the lower end toward the rear of the vehicle. It is comprised from the lower leg part 33 inclined and extended in the downward direction.

  As shown in FIGS. 4 and 5, the upper leg portion 29 is branched into a first branch portion 35 and a second branch portion 37. Specifically, in plan view, the first branch portion 35 extends toward the rear of the vehicle, and the second branch portion 37 extends obliquely inward in the vehicle width direction toward the rear of the vehicle. Thus, the 1st branch part 35 and the 2nd branch part 37 are branched so that it may mutually space apart in the vehicle width direction as it goes to the vehicle rear. In the present embodiment, a notch 39 serving as a fragile portion is formed on the inner side in the vehicle width direction of the front end of the second branch portion 37. By this notch 39, when a predetermined collision load is input to the bar 11, the second branch portion 37 is bent starting from the notch 39. Further, a flange 41 that is bent and extends downward is formed on the outer side in the vehicle width direction of the front portion of the first branch portion 35, and no flange is formed on the rear portion. The second branch portion 37 is formed with a flange 43 extending downward inward in the vehicle width direction over substantially the entire length in the longitudinal direction. Furthermore, tongue pieces 25 and 27 that are bent and extend upward are formed at the rear ends of the first branch portion 35 and the second branch portion 37. The tongue piece 25 of the first branch portion 35 is attached to the stay attaching portion 23, and the tongue piece 27 of the second branch portion 37 is attached to the stay attaching portion 24.

  The central leg 31 is bent from the front end of the upper leg 29 and extends downward, and is formed in a rectangular shape that is horizontally long when viewed from the front. The central leg 31 is provided with a pair of left and right bolts 45 that protrude toward the front of the vehicle.

  The lower leg 33 extends obliquely downward from the lower end of the central leg 31 toward the rear of the vehicle in a side view. The lower end of the lower leg 33 is formed in a tongue piece 47 that is bent and extends downward. In addition, flanges 49 that are bent downward and extend in the vehicle width direction on both sides of the lower leg portion 33 are formed over substantially the entire length in the front-rear direction (longitudinal direction).

  In order to attach the stay 21 to the front panel 13, bolt holes of the tongue pieces 25, 27 of the stay 21 are inserted into bolts provided on the front panel 13 and fastened, and provided on a mounting bracket 51 of the side member 15 described later. The bolt hole of the tongue piece 47 is inserted into the bolt and fastened.

  As shown in FIG. 3, a long bar 11 extending along the vehicle width direction is connected to the pair of left and right stays 21. The bar 11 includes a pair of fixed brackets 53 provided at both left and right ends, and a bar main body 55 disposed between the fixed brackets 53 and joined to the fixed bracket 53. The bar body 55 is integrally formed from cylindrical cylindrical portions 57 disposed on both sides in the vehicle width direction and flat portions 59 that connect the inner ends of the cylindrical portions 57 in the vehicle width direction. The cylindrical portion 57 is formed in a cylindrical shape having a circular cross section, and extends obliquely and obliquely toward the vehicle rear side as it goes inward in the vehicle width direction in plan view. The flat portion 59 is formed flat by crushing a cylinder in the front-rear direction, and extends along the vehicle width direction. As described above, the bar 11 is formed in the cylindrical portion 57 that is cylindrical on both sides in the vehicle width direction, and is formed in the flat portion 59 that crushes the cylinder in the front-rear direction at the center in the vehicle width direction. A collision detection sensor 61 is attached to the front side of 59. The collision detection sensor 61 detects that the vehicle has collided when a collision load is input to the bar 11 during a frontal collision of the vehicle and an acceleration is generated by relative movement to the rear of the vehicle relative to the vehicle body. To do. This detection signal is sent to an operating device (not shown) so that an airbag or the like is operated. In order to attach the bar 11 to the stay 21, the bolt hole of the fixing bracket 53 is inserted into the bolt 45 provided on the central leg 31 of the stay 21 and fastened.

  Further, as shown in FIG. 6, a pillar panel 63 is disposed along the vertical direction outside the side member 15 and the front panel 13 in the vehicle width direction. Is formed. A floor panel 66 is disposed below the passenger compartment 65. A front end portion of the side member 15 is set in a first area 67, and a rear side of the first area 67 is set in a second area 69. The side member 15 is formed in a rectangular cross section, and a plurality of beads 71 recessed inward are formed at four corners in the first region 67 at predetermined intervals in the vehicle front-rear direction. With these beads 71, the crushing load that collapses in the front-rear direction in the first region 67 is set lower than the crushing load in the second region 69. And the attachment bracket 51 by which side view was formed in L shape is fastened to the upper surface of the 2nd area | region 69. As shown in FIG. A tongue piece 47 formed at the lower end of the lower leg portion 33 of the stay 21 is fastened to the mounting bracket 51 via a bolt. The rigidity of the mounting bracket 51 is set larger than the rigidity of the lower leg portion 33 of the stay 21.

  Below, the effect by this embodiment is demonstrated.

(1) A pair of left and right side members 15 extending along the vehicle front-rear direction on both sides in the vehicle width direction at the front end of the vehicle body, a front panel 13 disposed above the side member 15, and the side member 15 And a pair of left and right stays 21 that bridge the front panel 13, a bar 11 that extends along the vehicle width direction and connects the pair of left and right stays 21, and a central portion in the vehicle width direction of the bar 11. A collision detection sensor 61 for detecting a vehicle collision by relative movement along the vehicle longitudinal direction with respect to the vehicle body. The lower end of the stay 21 is attached to the upper surface of the side member 15.

  Accordingly, the collision can be detected with higher sensitivity even in a form in which the obstacle collides with the vehicle width direction central portion and one side in the vehicle width direction with a simpler structure. That is, in any of the offset collision, the center collision, and the full lap collision, the collision detection sensor 61 can move backward with respect to the vehicle body together with the bar 11 to accurately detect the collision of the vehicle. Specifically, in the case of an offset collision in which an obstacle collides with one side in the vehicle width direction at the front end of the vehicle, the stay 21 on one side collapses in the front-rear direction and the bar 11 moves rearward obliquely, causing the collision detection sensor 61 to move rearward. Moving. In the case of a center collision in which an obstacle collides with the center in the vehicle width direction at the front end of the vehicle and in the case of a full lap collision, the collision detection sensor 61 moves backward together with the bar 11 and the stays 21 on both the left and right sides are crushed. Further, since the lower end of the stay 21 is attached to the upper surface of the side member 15, the front part of the side member 15 disposed in front of the attachment position is crushed and deformed to absorb the collision energy when the vehicle collides. However, the crushing deformation is not inhibited by the stay 21.

(2) The stay 21 extends in the vehicle front-rear direction in a side view, and has an upper leg 29 on which rear end tongue pieces 25 and 27 are attached to the front panel 13, and the upper leg 29. A central leg 31 extending downward from the front end of the vehicle and a lower leg 33 extending obliquely downward from the lower end of the central leg 31 toward the rear of the vehicle. A tongue piece 47 configured and provided at the lower end of the lower leg 33 is attached to a mounting bracket 51 on the upper surface of the side member 15.

  Therefore, when the vehicle travels, the upper leg 29 and the lower leg 33 absorb the vibration of the central leg 31, so that the vibration of the bar 11 and the collision detection sensor 61 is also suppressed. On the other hand, when the vehicle collides at high speed, the upper leg 29 is crushed and deformed in the vehicle front-rear direction, and the lower leg 33 supports the central leg 31 to rotate the central leg 31. To prevent movement. That is, when the lower leg 33 extends obliquely downward toward the front of the vehicle, the lower leg 33 cannot support the central leg 31 and the central leg 31 rotates downward about the rear end of the upper leg 29. Therefore, according to the present invention, the bar 11 and the collision detection sensor 61 attached to the central leg 31 are surely attached to the vehicle body when the vehicle has caused an offset collision or a center collision during high-speed traveling. On the other hand, it is possible to accurately detect a collision by moving backward.

(3) The side member 15 has a front first region 67 and a second region 69 disposed on the vehicle rear side of the first region 67, and the side member 15 extends in the vehicle front-rear direction in the first region 67. The crushing load is set to be smaller than the crushing load in the vehicle front-rear direction in the second region 69, and the lower end of the stay 21 is attached to the mounting bracket 51 on the upper surface of the second region 69 of the side member 15.

  Therefore, when the vehicle collides during low-speed traveling, the first region 67 of the side member 15 is crushed and deformed to absorb the collision energy. However, since the stay 21 is attached to the second region 69, this crushing is performed. The deformation is not hindered by the stay 21.

(4) The upper leg portion 29 of the stay 21 has a first branch portion 35 and a second branch portion 37 that are separated from each other in the vehicle width direction from the front end toward the rear of the vehicle in plan view.

  Therefore, since the rigidity when vibration is input to the stay 21 in the vehicle width direction is improved, the vibration of the bar 11 and the collision detection sensor 61 during the traveling of the vehicle is further suppressed.

(5) A notch 39 that is a fragile portion is formed in the second branch portion 37.

  Accordingly, when a collision load is input to the bar 11, the second branch portion 37 in which the notch 39 is formed easily breaks starting from the notch 39, so that the bar 11 to which the collision detection sensor 61 is attached moves backward. Is performed efficiently and collision detection is performed well. In the present embodiment, the notch 39 is formed in the second branch portion 37, but it may be formed in the first branch portion 35.

(6) A mounting bracket 51 is fixed to the upper surface of the side member 15, and a tongue piece 47 provided at the lower end of the lower leg 33 of the stay 21 is attached to the mounting bracket 51. The rigidity of the mounting bracket 51 is set larger than the rigidity of the lower leg portion 33 of the stay 21.

  Therefore, when the vehicle collides during high speed traveling, the mounting bracket 51 is not easily deformed, and the lower leg portion 33 of the stay 21 is efficiently crushed and deformed. Therefore, the rearward movement of the bar 11 attached with the collision detection sensor 61 is efficiently performed, and the collision can be accurately detected.

(7) The bar 11 is formed in a cylindrical portion 57 that is cylindrical on both sides in the vehicle width direction, and is formed in a flat portion 59 that crushes the cylinder in the front-rear direction at the center in the vehicle width direction. The collision detection sensor 61 is attached to the above.

  Therefore, since the front surface and the rear surface of the flat portion 59 are flat, it is easy to install the collision detection sensor 61. Further, since the flat portion 59 is lower in rigidity than the cylindrical portion 57, when the obstacle hits the central portion in the vehicle width direction, the flat portion 59 of the bar 11 is deformed and moved to the rear side of the vehicle, and the collision detection sensor. 61 becomes easy to move to the back of vehicles efficiently.

(8) As shown in FIG. 4, the flange 41 is formed in the front part in the 1st branch part 35 of the upper leg part 29 of the stay 21, and the flange is not formed in the rear part. The lower leg 33 is formed with a flange 49 over almost the entire length.

  Accordingly, since the portions where the flanges 41 and 49 are formed have high rigidity, when a collision load is input to the stay 21, the rear portion of the first branch portion 35 is first crushed and deformed, and then the first branch portion. The front part of the part 35 and the lower leg part 33 are crushed and deformed.

(9) On the rear side of the grill 5 of the front bumper 3, a bar 11 is disposed so as to face the both sides, and both sides of the bar in the vehicle width direction are formed in the cylindrical portion 57. Therefore, the air flowing into the front space portion 9 from the grill 5 is less likely to be blocked by the cylindrical portion 57.

DESCRIPTION OF SYMBOLS 11 ... Bar 13 ... Front panel 15 ... Side member 21 ... Stay 29 ... Upper leg part 31 ... Center side leg part 33 ... Lower leg part 35 ... First branch part 37 ... Second branch part 39 ... Notch (fragile part) )
DESCRIPTION OF SYMBOLS 51 ... Mounting bracket 57 ... Cylindrical part 59 ... Flat part 61 ... Collision detection sensor 67 ... 1st area | region 69 ... 2nd area | region

Claims (8)

A pair of left and right side members extending along the vehicle longitudinal direction on both sides in the vehicle width direction of the front end of the vehicle body;
A front panel disposed above the side member;
A pair of left and right stays that bridge the side member and the front panel;
A bar extending along the vehicle width direction and connecting the pair of left and right stays;
A collision detection sensor that is attached to the center of the bar in the vehicle width direction and detects a vehicle collision by relative movement along the vehicle longitudinal direction with respect to the vehicle body;
The vehicle body front structure according to claim 1, wherein a lower end of the stay is attached to an upper surface of the side member.   The stay is extended in the vehicle front-rear direction and has a rear end attached to the front panel in a side view, and a central side extending downward from the front end of the upper leg. A leg part and a lower leg part extending obliquely downward from the lower end of the central leg part toward the rear of the vehicle, the lower end of the lower leg part being the upper surface of the side member The vehicle body front structure according to claim 1, wherein the vehicle body front structure is attached to the vehicle body. The side member has a front first region and a second region disposed on the vehicle rear side of the first region,
The vehicle front-rear direction crush load in the first region is set smaller than the vehicle front-rear direction crush load in the second region,
The vehicle body front part structure according to claim 1, wherein a lower end of the stay is attached to an upper surface of the second region of the side member. The side member has a front first region and a second region disposed on the vehicle rear side of the first region,
The vehicle front-rear direction crush load in the first region is set smaller than the vehicle front-rear direction crush load in the second region,
The vehicle body front part structure according to claim 2, wherein a lower end of the stay is attached to an upper surface of the second region of the side member. The upper leg of the stay is a plan view, according to claim 2 or 4 and having a first branch portion extending away from each other in the vehicle width direction and the second branch portion toward the front end to the rear of the vehicle The vehicle body front structure described in 1. 6. The vehicle body front structure according to claim 5 , wherein a weak portion is formed in the first branch portion or the second branch portion. A mounting bracket is fixed to the upper surface of the side member, and the lower end of the lower leg portion of the stay is attached to the mounting bracket,
The vehicle body front structure according to any one of claims 2, 4 , 5 , and 6 , wherein the rigidity of the mounting bracket is set to be greater than the rigidity of the lower leg portion of the stay. . The bar is formed in a cylindrical portion having a cylindrical shape on both sides in the vehicle width direction, and a central portion in the vehicle width direction is formed in a flat portion that crushes the cylinder in the front-rear direction, and the collision detection sensor is attached to the flat portion. The vehicle body front portion structure according to any one of claims 1 to 7 , wherein the vehicle body front portion structure is provided.

Images