JP5913082B2 - Shock absorbing member - Google Patents

Description

  The present invention relates to an impact absorbing member used in a vehicle.

  The vehicle may have an impact absorbing function from the viewpoint of protecting the vehicle body and the collision object when another vehicle or an installation on the road (hereinafter referred to as a collision object) collides. preferable. For this reason, it is known that an impact absorbing member is used for a bumper of a vehicle, particularly at the front and rear of the vehicle.

  Patent Document 1 below discloses an impact energy absorber attached to bumper reinforcement. This impact energy absorber is a hollow body and is located between the bumper and the bumper reinforcement. The impact energy absorber is crushed by the load acting on the vehicle body when the impact energy absorber collides with the collision target. As a result, the impact energy absorber can absorb the collision energy and can mitigate the impact acting on the collision target or the vehicle body.

  Patent Document 2 listed below discloses a collision energy absorbing mechanism disposed between a bumper and a chassis. This collision energy absorption mechanism includes a pantograph-shaped link mechanism and a plastic energy absorption element. When an impact force is applied to the bumper, the link mechanism is deformed to reduce the impact. As described above, the structure disclosed in the following Patent Document 3 is known as the one that absorbs shock using the pantograph shape, and the pantograph shape is formed by integral molding of the metal plate. A configuration in which the bent portion is used as an energy absorbing element that plastically deforms to mitigate the impact is also known.

  The impact absorbing member as described above is advantageous in that its deformation amount can be set large in view of its performance. Therefore, the pantograph shape is widely used not only for the bumper but also for the impact absorbing member.

JP 2004-284464 A JP 54-117877 A Japanese Patent Laid-Open No. 11-20579

  However, the following problems exist in providing a pantograph-shaped impact absorbing member between the bumper and the vehicle body.

  In other words, the shock absorbing member used for the bumper is required to be easily deformable to the extent that the shock can be mitigated in the event of a vehicle collision. Rigidity is required. Also, in the pantograph shape, a bent part is formed in the middle of the pair of leg parts constituting the pantograph shape. However, when the shock absorbing member is deformed due to a vehicle collision, the rigidity other than the bent part is not easily deformed. Is required.

  In order to satisfy the above requirements, it is conceivable to secure rigidity by giving a sufficient thickness to the legs constituting the pantograph shape. However, when the thickness of the leg portion increases, the leg portion and the bent portion, or the leg portions easily interfere with each other at the time of deformation, and it becomes difficult to obtain a large amount of deformation.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an impact-absorbing member that can achieve both a sufficient amount of deformation and rigidity at the time of impact absorption.

  The shock absorbing member according to the present invention includes a main body portion that extends along one direction and includes a pair of leg portions, and a one-end-side fixing portion that is coupled to the main body portion at one end side in the extending direction of the main body portion. And the other end side fixing portion connected to the main body portion on the other end side in the extending direction of the main body portion, and the main body portion is deformed by a load acting between the one end side fixing portion and the other end side fixing portion. A pair of leg portions constituting the main body portion, a pair of vertical wall portions facing each other, a first bendable portion formed on the vertical wall portion, and at least one of the vertical wall portions And a second bendable portion formed on the flange portion. The leg portion is tertiary with respect to a load acting between the one end side fixing portion and the other end side fixing portion. Originally deformed.

  In this shock absorbing member, rigidity is ensured by the vertical wall portion and the flange portion of the leg portion. At the same time, the ease of deformation is ensured by the first bendable portion of the vertical wall portion and the second bendable portion of the flange portion. That is, the leg portion can be bent in the direction in which the vertical wall portions face each other, and can also be bent in the side edge direction of the vertical wall portion. Therefore, the deformation of the leg portion is three-dimensionally deformed with respect to the load acting between the one end side fixing portion and the other end side fixing portion, and the deformation of the leg portion is not easily restricted, and a sufficient amount of deformation is ensured. Has been.

  Further, the one end side fixing portion is fixed to the vehicle body of the vehicle, the other end side fixing portion is fixed to the bumper of the vehicle, and the pair of leg portions face each other with the vertical wall portions spaced apart from each other in the width direction of the vehicle body. The one end side fixing portion and the other end side fixing portion may be different in the vertical position. In this case, since the vertical position of the one end side fixing portion and the other end side fixing portion is different, the above three-dimensional deformation is more likely to occur.

  Further, the leg portion is made of a metal plate material, and the flange portion of the leg portion extends from the upper edge of the vertical wall portion to either the inner side or the outer side in the width direction of the vehicle body, and the vertical flange portion. A lower flange portion extending from the lower edge of the wall portion to the other of the inner side and the outer side in the width direction of the vehicle body, and the second bendable portion is formed in the upper flange portion. May be. In this case, the leg part including the upper flange part and the lower flange part can be formed by press molding.

  Further, the pair of leg portions may be in a pantograph shape, and the second bendable portion may be a weak portion made of a groove or a ridge formed in the flange portion. .

  ADVANTAGE OF THE INVENTION According to this invention, the impact-absorbing member which can satisfy | fill both sufficient deformation amount and rigidity at the time of impact absorption is provided.

FIG. 1 is a partial cross-sectional view showing a part of a vehicle according to an embodiment of the present invention. FIG. 2 is a top view showing a fixed state of each bumper mounting member with respect to the applicator in the vehicle of FIG. FIG. 3 is a schematic perspective view of the bumper mounting member shown in FIGS. FIG. 4 is a plan view (top view) of the bumper mounting member of FIG. FIG. 5 is a side view of the bumper mounting member of FIG.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description, the same reference numerals are used for the same elements or elements having the same function, and redundant description is omitted.

  As shown in FIG. 1, the vehicle 1 employs a bumper mounting member 3 as an impact absorbing member. Further, an applicator 5 as a bumper fixing portion extends in the width direction (the left-right direction of the vehicle body) on the vehicle body 1a of the vehicle 1.

  The applicator 5 is fixed to the radiator support 9 by a bracket 7. A radiator 11 is disposed in the radiator support 9. The radiator support 9 is fixed to the vehicle body frame 13. A mounting flange 17b of the radiator grille 17 is fixed to the body frame 13 by a fixing pin 15a. The radiator grille 17 is positioned below the bonnet 19 in the vehicle 1 and includes a grill body 17 facing the front of the vehicle 1 and a mounting flange 17b connected by the grill body 17 and a fixing pin 15b. Yes.

  The bumper mounting member 3 is disposed between the applicator 5 and the front bumper 21 so as to extend in the front-rear direction of the vehicle body 1a. As shown in FIG. 2, in this vehicle 1, three bumper attachment members 3 arranged in the width direction are attached to the applicator 5.

  As shown in FIGS. 3, 4 and 5, the bumper mounting member 3 is made of a single metal plate (rigid plate). The bumper mounting member 3 includes a first end side fixing portion 30, the other end side fixing portion 34, and a main body portion 36 which are integrally formed by bending the metal plate material by press working.

  The one end side fixing portion 30 is a portion connected to the front bumper 21 on the vehicle front side (front bumper 21 side) of the main body portion 36, and includes an upper wall 31 extending substantially in the horizontal direction. The upper wall 31 has an insertion hole 31a through which the fixing pin 15c is inserted. As shown in FIG. 1, the bumper mounting member 3 and the front bumper 21 are connected by the fixing pin 15c.

  The one end side fixing part 30 is also provided with side walls 32A, 32B extending downward from the left and right edges of the upper wall 31, and a lower flange provided to be bent at right angles in a direction away from the lower ends of the side walls 32A, 32B. A portion 33 is provided.

  The other end side fixing portion 34 is provided with an upper wall 35 extending along the substantially horizontal direction on the rear side (applitainer 5 side) of the main body portion 36. The other end-side fixing portion 34 is fixed to the applicator 5 by spot-welding the upper wall 35 to the upper surface 51 of the applicator 5 (location indicated by x in the figure). Reference numeral 35 a is a hole used for positioning when the upper wall 35 is welded to the upper surface 51 of the applicator 5.

  The position H1 of the upper wall 31 of the one end side fixing portion 30 and the position H2 of the upper wall 35 of the other end side fixing portion 34 described above are different with respect to the vertical direction of the vehicle body 1a as shown in FIG. More specifically, the upper wall 31 of the one end side fixing portion 30 is located higher than the upper wall 35 of the other end side fixing portion 34.

  The main body portion 36 extends along the front-rear direction of the vehicle body 1a between the one end side fixing portion 30 and the other end side fixing portion 34 described above.

  The main body portion 36 includes a pair of leg portions 37 extending in the front-rear direction of the vehicle body. Each leg portion 37 includes vertical wall portions 37 </ b> A and 37 </ b> B, an upper flange portion 38, and a lower flange 39.

  Each of the pair of vertical wall portions 37A and 37B is in an upright position along the vertical direction of the vehicle body 1a and continuously extends from the side walls 32A and 32B of the one-end-side fixing portion 30 along the longitudinal direction of the vehicle body 1a. Yes. More precisely, as shown in FIG. 5, the vertical wall portions 37 </ b> A and 37 </ b> B are equal to the upper wall 31 of the one end side fixing portion 30 higher than the upper wall 35 of the other end side fixing portion 34. The vehicle body 1a extends obliquely with respect to the front-rear direction. Both vertical wall portions 37A and 37B are opposed to each other with respect to the left-right direction of the vehicle body 1a and are arranged to be symmetrical.

  The upper flange portion 38 is provided on the upper side of each of the vertical wall portions 37A and 37B so as to be bent at a right angle in a direction approaching each other from the upper side edge of the vertical wall portions 37A and 37B. The upper wall 31 continuously extends along the front-rear direction of the vehicle body 1a. However, as shown in FIG. 5, the upper flange portion 38 is similar to the vertical wall portions 37 </ b> A and 37 </ b> B, because the upper wall 31 of the one end side fixing portion 30 is higher than the upper wall 35 of the other end side fixing portion 34. However, it extends inclining with respect to the longitudinal direction of the vehicle body 1a. Such an upper flange portion 38 ensures the rigidity of the leg portion 37.

  The lower flange portion 39 is provided on the lower side of each of the vertical wall portions 37A and 37B so as to be bent at right angles in a direction away from the upper side edges of the vertical wall portions 37A and 37B. 30 extends continuously from the lower flange portion 33 along the longitudinal direction of the vehicle body 1a. However, as shown in FIG. 5, the lower flange portion 39 is similar to the upper flange portion 38 as much as the upper wall 31 of the one end side fixing portion 30 is higher than the upper wall 35 of the other end side fixing portion 34. The vehicle body 1a extends with an inclination relative to the front-rear direction. Also by such a lower flange portion 39, the rigidity of the leg portion 37 is ensured similarly to the upper flange portion 38. A fixing flange portion 39 a that is fixed to a support surface 53 that extends forward from the lower edge of the front end surface 52 of the applicator 5 is provided on the rear side of the lower flange portion 39. The fixing flange portion 39a is spot welded to the support surface 53 of the applicator 5 (location indicated by x in the figure).

  Further, each of the vertical wall portions 37A, 37B is provided with three bendable portions (first bendable portions) 37a, 37b, 37c, and each upper flange portion 38 has three bendable portions ( (Second bendable parts) 38a, 38b, 38c are provided.

  Each of the bendable portions 37a, 37b, 37c of the vertical wall portions 37A, 37B is more than the other portion so as to be a starting point of bending in the left-right direction of the vehicle body 1a when a load in the front-rear direction of the vehicle body 1a is applied. It is a part formed as a fragile part that can be easily deformed. Of the bendable portions 37a, 37b, 37c, the bendable portion 37a located on the foremost side is a portion that is formed at the boundary with the side walls 32A, 32B of the one-end-side fixing portion 30 and is bendable in the direction of the valley fold ( Groove portion) and extends over the entire height of the vertical wall portions 37A and 37B. Of the bendable portions 37a, 37b, and 37c, the bendable portion 37c located on the rearmost side also extends over the entire height of the vertical wall portions 37A and 37B, which can be bent in the direction of the valley fold, like the bendable portion 37a. It is a groove. Of the bendable portions 37a, 37b, and 37c, the bendable portion 37b located in the middle is a portion (a ridge portion) that can be bent in the direction of the mountain fold.

  According to the three bendable portions 37a, 37b, and 37c provided on the vertical wall portions 37A and 37B, when a longitudinal load on the vehicle body 1a is applied, the vertical wall portions 37A and 37B are arranged in the vertical direction of the vehicle body 1a. Is bent in the left-right direction of the vehicle body 1a in a plan view of a plane orthogonal to the plane (surface stretched in the front-rear direction and the left-right direction). More specifically, the vertical wall portions 37A and 37B have the bendable portion 37a and the bendable portion 37b positioned at the other end side from the state of the connecting line L1 that connects the bendable portions 37a, 37b, and 37c shown in FIG. It moves to the position of the bendable part 37a ′ and the bendable part 37b ′ on the fixed part 34 side, and bends so as to be in the state of the connecting line L2.

  Each of the bendable portions 38a, 38b, 38c of each upper flange portion 38 is deformed more than the other parts so that it becomes a starting point that bends in the vertical direction of the vehicle body 1a when a load in the longitudinal direction of the vehicle body 1a is applied. It is a part formed as an easy fragile part. These bendable portions 38a, 38b, and 38c are provided at positions approximately corresponding to the bendable portions 37a, 37b, and 37c of the vertical wall portions 37A and 37B. Of the bendable portions 38a, 38b, and 38c, the bendable portion 38a located at the foremost side is a portion (groove portion) formed at the boundary with the upper wall 31 of the one end side fixing portion 30 and bendable in the direction of the valley fold. ) Extending over the entire width of the upper flange 38. Of the bendable portions 38a, 38b, and 38c, the bendable portion 38c located at the rearmost side is also a groove portion that can be bent in the direction of the valley fold and extends over the entire width of the upper flange portion 38, similarly to the bendable portion 38a. Yes, and formed at the boundary with the upper wall 35 of the other end side fixing portion 34. Of the bendable portions 38a, 38b, and 38c, the bendable portion 38b that is located in the middle is a portion that can be bent in the direction of the mountain fold (protrusion).

  According to the three bendable portions 38a, 38b, and 38c provided with the upper flange portions 38, the upper flange portions 38 are orthogonal to the left-right direction of the vehicle body 1a when a longitudinal load on the vehicle body 1a is applied. In the plan view of the surface to be bent (the surface stretched in the front-rear direction and the vertical direction), the vehicle body 1a is bent in the vertical direction. More specifically, as shown in FIG. 5, in the upper flange portion 38, the positions of the bendable portions 38a, 38b, 38c are all moved upward, and the bendable portions 38a ′, 38b ′, 38c ′ are positioned. And bent so as to be in the state of the connecting line L3.

  As described above, the bumper mounting member 3 is fixed to the upper retainer 5 by spot welding at the upper wall 35 and the fixing flange portion 39a of the other end side fixing portion 34, as shown in FIG. As shown in FIG. 1, the rear end of the front bumper 21 is placed on the upper wall 31 of the one end side fixing portion 30 of each bumper mounting member 3, and the front bumper 21 and each bumper mounting member 3 are fixed to the fixing pin 15c. Fixed by. That is, the front bumper 21 is fixed in a state of being orthogonal to each bumper mounting member 3, and each one end side fixing portion 30 supports the front bumper 21 from below the vehicle body 1a. Thus, each bumper mounting member 3 connects the applicator 5 and the front bumper 21, and the front bumper 21 is fixed to the vehicle body 1 a below the radiator grill 17. In addition, the other structure in this vehicle 1 is the same as that of a well-known vehicle.

  In the vehicle 1, when a collision object collides with the front bumper 21, a load F directed toward the rear side of the vehicle body 1 a acts on each bumper mounting member 3 as shown in FIG. 3. Then, in each bumper attachment member 3, it bends in the left-right direction of the vehicle body 1a starting from the bendable portions 37a, 37b, 37c of the vertical wall portions 37A, 37B. That is, when the load F acts on the front bumper 21, each of the bumper mounting members 3 bends the pair of vertical wall portions 37 </ b> A and 37 </ b> B as if the pantograph is folded, and the one end side fixing portion 30 is It deform | transforms so that the other end side fixing | fixed part 34 and by extension, the applicator 5 may adjoin. Due to this deformation, the peak of the load acting on the vehicle body and the impacted body is reduced, and the impact is alleviated.

  At the same time, each bumper mounting member 3 is deformed starting from the bendable portions 38a, 38b, 38c of the upper flange portion 38. At this time, the upper flange portion 38 bends before and after the bendable portion 38b without overlapping. Therefore, a situation in which the upper flange portions 38 interfere with each other during the bending of the leg portion 37 is avoided, and the deformation of the leg portion 37 is hardly restricted. Therefore, it is easy to ensure a sufficient amount of deformation at the time of shock absorption and has excellent shock absorption.

  As described above, in the bumper mounting member (impact absorbing member) 3 described above, rigidity is ensured by the vertical wall portions 37 </ b> A and 37 </ b> B and the upper flange portion 38 of the leg portion 37. At the same time, ease of deformation is ensured by the bendable portions 37a, 37b, 37c of the vertical wall portions 37A, 37B and the bendable portions 38a, 38b, 38c of the upper flange portion 38. That is, the leg portion 37 can be bent in the direction in which the vertical wall portions 37A and 37B face (vehicle width direction), and can also be bent in the side edge direction (vertical direction) of the vertical wall portions 37A and 37B. ing.

  Thus, since the leg portion 37 of the bumper mounting member 3 is three-dimensionally deformed with respect to the load F, the deformation is caused by the interference of the leg portion 37 itself (for example, the interference between the upper flanges 38) at the time of absorbing the impact. Is not restricted, and a sufficient amount of deformation is ensured with little crushing residue. Therefore, even if the upper flange portion 38 or the lower flange portion 39 is formed on the leg portion 37, the deformation amount of the leg portion 37 is not impaired, and the peak of the load acting on the vehicle body or the impacted body is kept low. High shock absorption can be realized.

  In particular, in the bumper mounting member 3, the position H1 of the upper wall 31 of the one end side fixing portion 30 is above the position H2 of the upper wall 35 of the other end side fixing portion 34 in the vertical direction of the vehicle body 1a. The one-end-side fixing portion 30 is easily deformed in a direction to ride on the other-end-side fixing portion 34, and the above-described three-dimensional deformation is more likely to occur.

  In addition, this invention is not limited to the said embodiment, A various deformation | transformation is possible. For example, the flange portion is not necessarily provided on both the upper side and the lower side of the leg portion, and may be provided only on the upper side or the lower side. Further, the shape of the bendable portion as the weak portion provided in the leg portion or the flange portion is not limited to the groove portion or the ridge portion, but may be any other shape (for example, a notch) as long as it can be bent. Good.

  In the embodiment described above, there are three bendable parts formed on the leg part and the flange part, but the number can be increased or decreased as appropriate. The fixing between the impact absorbing member and the vehicle body (for example, the applicator) is not limited to the spot welding described above, and a known fixing method such as fixing with a bolt / nut can be employed.

  Further, the impact absorbing member is not necessarily provided on the front bumper side, and can be appropriately applied to the rear bumper side.

  DESCRIPTION OF SYMBOLS 1 ... Vehicle, 1a ... Vehicle body, 3 ... Bumper attachment member (shock absorbing member), 30 ... One end side fixing part, 34 ... Other end side fixing part, 36 ... Main part, 37 ... Leg part, 37A, 37B ... Vertical wall , 37a, 37b, 37c ... bendable part, 38 ... upper flange part, 38a, 38b, 38c ... bendable part, 39 ... lower flange part.

Claims (5)

A main body portion extending along one direction and configured by a pair of leg portions, one end side fixing portion connected to the main body portion at one end side in the extending direction of the main body portion, and an extension of the main body portion An impact that deforms the main body portion by a load acting between the one end side fixing portion and the other end side fixing portion. An absorbent member,
The pair of leg portions constituting the main body portion,
A pair of vertical wall portions facing each other;
A first bendable portion formed on the vertical wall portion;
A flange portion extending from at least one side edge of the vertical wall portion;
A second bendable part formed on the flange part,
The said leg part is an impact-absorbing member which deform | transforms three-dimensionally with respect to the load which acts between the said one end side fixing | fixed part and the said other end side fixing | fixed part. The one end side fixing portion is fixed to a vehicle bumper , and the other end side fixing portion is fixed to a vehicle body of the vehicle;
The pair of leg portions are arranged so that the vertical wall portions are spaced apart from each other in the width direction of the vehicle body,
The impact absorbing member according to claim 1, wherein the one end side fixing portion and the other end side fixing portion have different vertical positions.
The leg is made of a metal plate,
The flange portion of the leg portion is
An upper flange portion extending from the upper edge of the vertical wall portion to either the inner side or the outer side in the width direction of the vehicle body;
A lower flange portion extending from the lower edge of the vertical wall portion to the other of the inner side and the outer side in the width direction of the vehicle body,
The impact absorbing member according to claim 2, wherein the second bendable part is formed in the upper flange part.   The impact-absorbing member according to any one of claims 1 to 3, wherein the pair of legs has a pantograph shape.   The impact-absorbing member according to any one of claims 1 to 4, wherein the second bendable portion is a fragile portion including a groove portion or a ridge portion formed in the flange portion.

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