JP5675852B2 - Auto body front structure - Google Patents

Description

  The present invention includes a bumper beam disposed in front of a front wheel in a left-right direction, a vehicle body member disposed below the bumper beam, an impact absorbing member connecting the bumper beam and the vehicle body member, and the impact absorbing member. The present invention relates to a vehicle body front structure including a bumper face covering the vehicle.

  Such a front body structure of an automobile is known from Japanese Patent Application Laid-Open No. 2004-228561.

Vehicle body front structure of the vehicle, if the obstacle is the front of the automobile collides, as the shock absorbing member constituted by bending in a direction forwardly projecting metal plates in a plurality of polygonal line collapse at a collision load variations In this case, the impact absorbing member is crushed and the pressure receiving area is increased to absorb the impact applied to the obstacle, and the impact absorbing member is deformed to protrude downward. By doing so, it is possible to prevent the obstacle from being caught in the lower surface of the vehicle body.
Japanese Unexamined Patent Publication No. 2010-162949

  However, if the lower surface of the shock absorbing member is covered with the bumper face of the front bumper, even if the shock absorbing member tries to deform at the time of frontal collision with an obstacle, it cannot interfere with the bumper face and deform freely. There is a possibility that the desired shock absorbing performance may not be exhibited.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to make it possible to exhibit a desired shock absorbing performance even when the shock absorbing member interferes with the bumper face.

In order to achieve the above object, according to the present invention, a bumper beam disposed in the left-right direction in front of a front wheel, a vehicle body member disposed below the bumper beam, and the bumper beam and the vehicle body member are connected. a plate-shaped shock absorbing member for, and a bumper face covering the shock-absorbing member, the impact absorbing member includes an upper end mounting portion fixed to the bumper beam, and a top portion extending forwardly from the upper end mounting portion A front surface portion extending downward from the upper surface portion, a lower surface portion extending rearward from the front surface portion, and a lower end mounting portion for fixing a rear end of the lower surface portion to the vehicle body member, and from the front wheel to the bumper face The lower surface portion disposed along the approach slope line extending to the lower surface is divided into a front lower surface portion and a rear lower surface portion by a bent portion extending in the left-right direction and bent downward. And, in the vehicle body front structure of an automobile in which the front lower surface portion by the bent portion is bent when the front collision of the vehicle overhangs downward, the shock absorbing member, the front lower surface portion and the rear lower surface A fragile portion that is deformed or broken by the impact absorbing member that is deformed at the time of a frontal collision of the vehicle is formed at a lower portion of the bumper face that faces the lower side of the vehicle. The fragile portion is a first tier that extends in the left-right direction. And a pair of left and right second tier lines extending in the front-rear direction from both ends of the first tier line, and formed in an H shape, the first tier line extending along the bent portion and It is formed so as to extend outward in the left and right directions from the left and right ends of the bent portion, and the front-rear direction distance between the first tier line and the bent portion is between the first tier line and the front lower surface portion. front end The front-rear direction distance and the front-rear direction distance between the first tear line and the rear end of the rear lower surface are set shorter than each other. When deformed downward as the bumper face is the first pressed back surface downward by the bent portion, the vehicle body front of an automobile opening to isosamples broken in the second tear line and the first feature A structure is proposed .

Incidentally, in response to the weak portions of the first tear line 13a and the second tear line 13 b is the invention of the embodiment corresponds to the vehicle body member of the present invention under member 17 of the embodiment, the previous embodiments subordinates surface portion 20d and the rear lower surface portion 20e corresponds to corresponds to the lower surface portion of the present invention.

  According to the first configuration of the present invention, when the automobile collides front with an obstacle and a collision load is input from the bumper face to the shock absorbing member, the shock absorbing member is crushed in the front-rear direction and absorbs the collision energy. At that time, the upper surface, the front surface, and the front lower surface portion of the shock absorbing member are deformed so as to form one surface extending in the vertical direction, thereby increasing the pressure receiving area and reducing the impact applied to the obstacle. In addition, it is possible to prevent the obstacle from being caught in the lower surface of the vehicle body by bending the bent portion of the lower surface portion and projecting the front lower surface portion downward.

When the impact absorbing member is deformed by the input of a collision load, there is a possibility that the free deformation of the impact absorbing member may be hindered by interfering with the bumper face facing the lower surface, but the impact absorbing member deformed on the bumper face since the fragile portion pressed to deform or break in the is formed, that the bumper face is deformed or broken so as to follow the deformation of the impact absorbing member, it is possible to prevent the deformation of the impact absorbing member is inhibited .

In addition , the fragile part of the bumper face is formed in an H shape having a first tier line extending in the left-right direction and a pair of left and right second tier lines extending in the front-rear direction from both ends of the first tier line. Therefore, the shock absorbing member can be freely deformed by cutting the bumper face along the first and second tear lines .

FIG. 1 is a perspective view of a front part of a vehicle body. (First embodiment) 2 is a cross-sectional view taken along line 2-2 of FIG. (First embodiment) FIG. 3 is an exploded perspective view of the main part of FIG. (First embodiment) FIG. 4 is a view in the direction of arrows 4 in FIG. (First embodiment) FIG. 5 is a diagram for explaining the operation at the time of a frontal collision of an automobile. (First embodiment) FIG. 6 corresponds to FIG. (Embodiment of the first and second reference) FIG. 7 is a perspective view of the front part of the vehicle body. ( Third embodiment of reference ) 8 is a cross-sectional view taken along line 8-8 in FIG. ( Third embodiment of reference ) FIG. 9 is an exploded perspective view of the main part of FIG. ( Third embodiment of reference ) FIG. 10 is a view in the direction of arrow 10 in FIG. ( Third embodiment of reference ) FIG. 11 is a perspective view of the bumper face with the lid open. ( Third embodiment of reference ) FIG. 12 is an explanatory view of the action at the time of a frontal collision of an automobile. ( Third embodiment of reference ) FIG. 13 corresponds to FIG. ( Fourth Reference Embodiment)

13 Bumper face 13a First Tier Line (fragile part)
13b Second Tier Line (Vulnerable Department )
1 7 Under member (body member)
19 Bumper beam 20 Shock absorbing member 20a Upper end mounting portion 20b Upper surface portion 20c Front surface portion 20d Front lower surface portion (lower surface portion)
20e Rear lower surface (lower surface)
20f Lower end mounting part
2 2 before wheel
A approach sloping line d bent part

  Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. In the present specification, the front-rear direction and the left-right direction are defined with reference to an occupant seated in a driver seat.

First embodiment

  As shown in FIGS. 1 and 2, a thin synthetic resin is connected to the front of the front grill 11 and the left and right front fenders 12 and 12 at the front of the body of an SUV (Sports Utility Vehicle) type vehicle. The bumper face 13 formed integrally with is arranged. A frame-shaped bulkhead 14 that is disposed at the front of the vehicle body and supports a radiator (not shown) is connected to the front ends of the left and right front side frames 15 and 15 and has left and right stays 16 and 16 extending in the vertical direction. An under member 17 is provided that connects the lower ends of the stays 16 and 16 and extends in the left-right direction.

A bumper beam 19 is supported in front of the front wheels 22 via the left and right brackets 18 and 18 on the front surfaces of the left and right stays 16 and 16 of the bulkhead 14. A plate-like impact absorbing member 20 formed by bending a metal plate is supported by the bumper beam 19 extending in the left-right direction and the under member 17 extending in the left-right direction. The lower, front and upper sides of the shock absorbing member 20 and the bumper beam 19 are covered with the bumper face 13.

  As shown in FIGS. 2 and 3, the shock absorbing member 20 is bent by five bent portions a, b, c, d, e extending in parallel with each other in the left-right direction. The upper surface mounting portion 20a, the upper surface portion 20b, the front surface portion 20c, the front lower surface portion 20d, the rear lower surface portion 20e, and the lower end mounting portion 20f are divided. Brackets which are fixed to the front surface of the bumper beam 19 with bolts 23 and nuts 24, and whose lower end mounting portions 20f are provided on the upper surface of the under member 17 positioned below and behind the bumper beam 19 with bolts 25 and nuts 26. 27.

The upper surface portion 20b extends from the bent portion a of the lower end of the upper mounting portion 20a extending in the vertical direction before the lower, front part 20 c extends substantially downward from the bent portion b of the front end of the upper surface portion 20b, the front lower surface portion 20d extends rearward and downward from the bent portion c at the lower end of the front surface portion 20c, and the rear lower surface portion 20e extends rearward and downward from the bent portion d at the rear end of the front lower surface portion 20d at a lower angle. The attachment portion 20f extends downward in the vertical direction from the bent portion e at the rear end of the rear lower surface portion 20e. Upper surface portion 20b of the shock absorbing member 20, the front portion 20 c, the front lower surface portion 20d and the rear lower surface portion 20e is bent portion b, c, are bent convexly outward in d. Further, the front lower surface portion 20 d and the rear lower surface portion 20 e are arranged along the approach slope line A extending from the front wheel 22 to the lower surface of the bumper face 13.

As shown in FIGS. 3 and 4, the lower portion of the bumper face 13 facing the front lower surface portion 20d and the rear lower surface portion 20e of the shock absorbing member 20 is easily breakable weakened portion by an external force are formed. That is, the lower portion of the bumper face 13, a first tear line 13a extending in the lateral direction, the pair of second tear line 13b extending in the longitudinal direction from the left and right end portions of the first tear line 13a, 13b and the "H" It is formed in a letter shape. The first and second tier lines 13a, 13b, and 13b are composed of perforations laser-processed from the back side of the bumper face 13, and the perforations are formed to a depth that does not reach the front side of the bumper face 13. This prevents the first and second tear lines 13a, 13b, 13b from being exposed to the surface of the bumper face 13 and deteriorating the aesthetic appearance.

The first tear line 13a is formed so as to extend along the bent portion d and to the left and right outer sides from the left and right ends of the bent portion d, and is also bent with the first tear line 13a. The front-rear direction distance between the parts d is shorter than any of the front-rear direction distance between the first tear line 13a and the front end of the front lower surface part 20d and the front-rear direction distance between the first tear line 13a and the rear end of the rear lower surface 20e. Is set. That is, the first and second tier lines 13a, 13b, and 13b of the bumper face 13 are opposed to each other below the front lower surface portion 20d and the rear lower surface portion 20e of the shock absorbing member 20 through a slight distance. In addition, the size is set to cover the entire front lower surface 20d and rear lower surface 20e of the shock absorbing member 20.

  Next, the operation of the first embodiment of the present invention having the above configuration will be described.

As shown in FIG. 5, when the automobile collides with an obstacle such as a pedestrian in front, the thin synthetic resin bumper face 13 is easily buckled by the collision load, and the collision load is applied to the front portion 20 c of the shock absorbing member 20. input. The front lower surface portion 20d and the rear lower surface portion 20e are connected via a fragile bent portion d, and the front and rear lengths of the front lower surface portion 20d and the rear lower surface portion 20e are larger than the front and rear direction length of the upper surface portion 20b. The upper three bent portions a, b, c are deformed so that the angle increases, and the lower two bent portions d, e are deformed so that the angle decreases. Thus, the positions of the middle three bent portions b, c, d move backward and downward.

As a result, upper surface portion 20b, the front portion 20 c and the front lower surface portion 20d is to move backward while deployed in a plane which extends substantially vertically, to ensure a stroke for absorbing the collision load, and receives the collision load By securing a wide pressure-receiving area, the impact applied to the pedestrian can be reduced. Since the front lower surface portion 20d moves downward while standing, the gap between the bent portion d at the lower end of the front lower surface portion 20d and the road surface is reduced, and the pedestrian's body is caught in the lower surface of the vehicle body. Can be prevented.

Meanwhile, when the impact absorbing member 20 is deformed downward, since the lower portion of the bumper face 13 thereunder are located close, bent portion d of the shock absorbing member 20 interferes with the rear surface of the bumper face 13 As a result, the free deformation of the shock absorbing member 20 is hindered and the shock absorbing effect may not be sufficiently exhibited.

However, according to this embodiment, the shock absorbing member 20 in the collision load frontal collision Tokiniso the vehicle is deformed downwardly bent portion d as the vertex, bumper pushed back surface downward by the bent portion d face 13, a first weak, by second Te Iarain 13a, 13b, and broken in 13b opening, the impact absorbing member 20 disposed thereabove is deformed downward without being obstructed by the bumper face 13 Thus, the shock absorbing performance of the shock absorbing member 20 can be maximized.

Next, first and second reference embodiments of the present invention will be described with reference to FIG.
First and second embodiments of the Reference]
FIG. 6 (A) shows a second embodiment of the present invention, where the fragile portion of the bumper face 13 includes a first tier line 13c extending in the left-right direction and front and left ends of the first tier line 13c. A pair of second tier lines 13d, 13d extending in the direction is formed in a “U” shape. As in the first embodiment, the first and second tier lines 13c, 13d, and 13d are constituted by perforations laser-processed from the back side of the bumper face 13, and the perforations of the bumper face 13 are formed. By forming at a depth that does not reach the surface side, the first and second tear lines 13c, 13d, and 13d are prevented from being exposed to the surface of the bumper face 13 and deteriorating the appearance.

Also according to the first reference embodiment, when the shock absorbing member 20 is deformed downward by the collision load of the frontal collision, the bumper face 13 whose back surface is pushed downward by the bent portion d becomes the fragile first. , by second Te Iarain 13c, 13d, and broken at 13d opening, it is possible to shock absorbing member 20 disposed thereabove is deformed downward without being obstructed by the bumper face 13, the shock absorbing member 20 The shock absorbing performance can be maximized.

FIG. 6B shows a second reference embodiment of the present invention, in which a fragile portion of the bumper face 13 is formed along a front-rear direction at two positions spaced apart in the left-right direction. 13e, 13e.

  When the shock absorbing member 20 is deformed downward by the collision load of the frontal collision, the bumper face 13 whose rear surface is pushed downward by the bent portion d is broken starting from a pair of fragile slits 13e and 13e, and finally The fracture surface grows so as to connect the pair of slits 13e and 13e to each other, so that the shock absorbing member 20 disposed above can be deformed downward without being obstructed by the bumper face 13, and the shock absorbing member 20 shock absorbing performance can be maximized.

Next, a third reference embodiment of the present invention will be described with reference to FIGS.
[ Third Reference Embodiment]
As shown in FIGS. 7 to 11, the bottom of the bumper face 13 facing the front lower surface portion 20d and the rear lower surface portion 20e of the shock absorbing member 20 is formed with a U-shaped opening 13f, the opening 13f A rectangular lid 21 that can be closed without a gap is formed integrally with the bumper face 13. The lid 21 constitutes a part of the bumper face 13, and the front edge of the lid 21 is swingably connected to the front edge of the opening 13 f of the bumper face 13 by a first hinge 21 a formed thin. Since the bumper face 13 and the lid 21 are integrally formed of polypropylene, the first hinge 21a has sufficient flexibility. In addition, since the first hinge 21a is configured with a thin part of the bumper face 13, the number of parts can be reduced and the cost can be reduced as compared with the case of providing a separate hinge.

  The lid 21 includes second and third hinges 21b and 21c formed by thin portions extending in parallel with the first hinge 21a. The lid 21 has the first surface P, the first hinge by the first to third hinges 21a to 21c. Divided into two surfaces Q and a third surface R. The lid 21 is bent at the first to third hinges 21a to 21c, so that the first surface P to the third surface R are curved so as to follow the curvature of the bumper face 13, and the opening 13f of the bumper face 13 is formed as a gap. It can be closed without.

  Two first locking claws 13g, 13g are formed on the back surface of the bumper face 13 adjacent to the front of the first hinge 21a, and two second locking claws are formed on the back surface of the first surface P of the lid 21. 21d and 21d are formed, and on the back surface of the third surface R of the lid 21, three third locking claws 21e are formed. The first locking claws 13g, 13g of the bumper face 13 and the second locking claws 21d, 21d of the lid 21 are locked to four slits 20g formed in the front lower surface portion 20d of the shock absorbing member 20, The third locking claws 21e of the lid 21 are locked to slits 17a formed in the under member 17.

Next, the operation of the third embodiment of the present invention having the above configuration will be described.

However, according to the present embodiment, as shown in FIG. 12, when the shock absorbing member 20 is deformed downward by the collision load of the frontal collision, the back surface of the lid 21 is pushed downward by the bent portion d, and the bumper When the face 13 and the lid 21 move relative to the shock absorbing member 20 and the under member 17, the first locking claws 13g and 13g of the bumper face 13 and the second locking claws 21d and 21d of the lid 21 absorb the shock. The lid 21 is separated from the slit 20g of the front lower surface portion 20d of the member 20, and the third locking claw 21e of the lid 21 is separated from the slit 17a of the under member 17, so that the lid 21 is a first hinge at the front edge. It swings downward around 21a to open the opening 13f of the bumper face 13.

  Thereby, the shock absorbing member 20 disposed above the lid 21 can be deformed downward without being obstructed by the bumper face 13, and the shock absorbing performance of the shock absorbing member 20 can be maximized.

At this time, since the first hinge 21 a extends in the left-right direction along the front edge of the lid 21, the shock absorber 20 can be freely deformed by largely opening the lid 21 around the front edge. In addition, since the lid 21 is fixed to the shock absorbing member 20 and the under member 17, the lid 21 is securely held in the closed position at the normal time, and at the time of collision, the deformation of the shock absorbing member 20 and the shock absorbing member 20 and the under member 17 are prevented . The fixation of the lid 21 is released by relative movement, and the lid 21 can be reliably opened.

Next, a fourth reference embodiment of the present invention will be described with reference to FIG.
[ Fourth embodiment]
In the third reference embodiment, the left and right side edges of the lid 21 are separated from the opening 13f of the bumper face 13, but in the fifth embodiment shown in FIG. It is connected to the opening 13f of the face 13 through tearable lines 21f and 21f. The tear lines 21f and 21f are composed of perforations laser-processed from the back surface side of the bumper face 13, and the perforations are formed to a depth that does not reach the front surface side of the bumper face 13, so that the tear lines 21f and 21f, 21f is prevented from being exposed to the surface of the bumper face 13 and deteriorating the appearance.

According to the fourth embodiment, when the shock absorbing member 20 is deformed downward by the collision load of the frontal collision, the back surface of the lid 21 is pushed downward by the bent portion d, whereby the tear line 21f, 21f is broken and the lid 21 is opened as in the third embodiment. Thereby, the shock absorbing member 20 can be deformed downward without being obstructed by the bumper face 13, and the shock absorbing performance of the shock absorbing member 20 can be maximized.

  The embodiments of the present invention have been described above, but various design changes can be made without departing from the scope of the present invention.

  For example, the vehicle body member that fixes the lower end mounting portion 20f of the shock absorbing member 20 is not limited to the under member 17 of the bulkhead 14 of the embodiment.

  In the embodiment, the bumper face 13 pushed by the shock absorbing member 20 is broken, but the bumper face 13 may be deformed without breaking.

In the reference embodiment, the lid 21 is formed integrally with the bumper face 13, but the lid 21 may be formed as a separate member with respect to the bumper face 13 and connected to the bumper face 13 via a hinge. .

Claims (1)

A bumper beam (19) disposed in front of the front wheel (22) in the left-right direction, a vehicle body member (17) disposed below the bumper beam (19), the bumper beam (19), and the vehicle body member ( 17) a plate-like shock absorbing member (20) for connecting, and a bumper face (13) covering the shock absorbing member (20),
The impact absorbing member (20) includes an upper end mounting portion (20a) fixed to the bumper beam (19), an upper surface portion (20b) extending forward from the upper end mounting portion (20a), and the upper surface portion (20b). ), A lower surface portion (20d, 20e) extending rearward from the front surface portion (20c), and a rear end of the lower surface portion (20d, 20e) to the vehicle body member (17). A lower end mounting portion (20f) for fixing,
The lower surface portions (20d, 20e) disposed along the approach slope line (A) extending from the front wheel (22) to the lower surface of the bumper face (13) are folded in a lateral direction and bent downward. The bent portion (d) is divided into a front lower surface portion (20d) and a rear lower surface portion (20e), and the front lower surface portion (20d) is bent by bending the bent portion (d) at the time of a vehicle frontal collision. ) Projecting downward in the car body structure,
The shock absorbing member (20), the lower portion of the front lower surface portion (20d) and said rear underside the bumper face (13) facing the lower (20e), said shock absorber to be deformed during a frontal collision of the vehicle member (20) pushed by the deformation or fracture brittle portion (13a, 13 b) is formed,
The fragile portions (13a, 13b) include a first tier line (13a) extending in the left-right direction and a pair of left and right second tier lines (13b) extending in the front-rear direction from both ends of the first tier line (13a). Having an H-shape,
The first tear line (13a) is formed so as to extend along the bent portion (d) and to the left and right outer sides from the left and right ends of the bent portion (d).
The front-rear direction distance between the first tear line (13a) and the bent part (d) is the front-rear direction distance between the first tear line (13a) and the front end of the front lower surface part (20d), and It is set shorter than any of the distance in the front-rear direction between the first tier line (13a) and the rear end of the rear lower surface (20e),
When the impact absorbing member (20) is deformed downward with the bent portion (d) as a vertex due to the collision load at the time of a frontal collision of the vehicle, the bumper face is pushed downward by the bent portion (d). (13) the first, front body structure for an automobile, wherein an opening to isosamples broken in the second tear line (13a, 13b).

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