JP5251692B2 - Vehicle framework - Google Patents

Description

  The present invention relates to a vehicle skeleton member used for vehicle skeleton formation.

  Conventionally, vehicle skeleton members used for vehicle skeleton formation have been studied. An example of such a member is an impact absorbing member disclosed in Patent Document 1. This shock absorbing member is used for forming a skeleton in the front portion of the vehicle. Moreover, it is set as the shape of a hollow rectangular parallelepiped, and has an isosceles triangle-shaped opening whose opening width gradually decreases from the front to the rear of the vehicle on the left and right side surfaces and the top and bottom surfaces.

  When the impact absorbing member receives an impact load from the front to the rear of the vehicle, the portion having a wide opening width on the front side of the vehicle is greatly deformed. In this way, the portion of the vehicle front side is greatly deformed, so that the impact load is absorbed mainly by the portion of the front side.

JP 2007-45296 A

  However, in the shock absorbing member disclosed in Patent Document 1, the portion on the vehicle front side of the surface provided with the opening is mainly deformed, and the portion on the vehicle rear side maintains a relatively high rigidity. . For this reason, the deformation with respect to the impact load as a whole is insufficient, and a sufficient impact absorbing effect may not be obtained.

  Then, the subject of this invention is providing the frame member for vehicles which can be easily crushed with respect to an impact load, and can acquire sufficient impact absorption effect.

A vehicle skeleton member according to the present invention that has solved the above-mentioned problems is a vehicle skeleton member used for vehicle skeleton formation, has a long shape, is formed in a hollow shape by a plurality of face plate portions , and is longitudinally a body portion which cross section perpendicular forms a polygonal shape, a pair of seat屈誘Department spaced apart along the longitudinal direction of the body portion is formed in the main body portion, it is between the pair of seat屈誘Department The at least one face plate portion is formed with a fragile portion having a substantially polygonal opening , and the other face plate portions are not formed with a fragile portion .

In order to obtain a sufficient impact absorbing effect in the vehicle skeleton member, it is necessary to collapse the weakened portion formed in the main body as a whole. In the vehicle skeleton member of the present invention, the pair of buckling induction portions that are separated from each other in the longitudinal direction of the main body is formed on the main body. Therefore, when an impact load is applied in the longitudinal direction of the main body, buckling occurs. Buckling occurs from the induction part. When such buckling occurs, a load is transmitted to the fragile part formed between the buckling induction parts, and the fragile part is crushed as a whole. Therefore, it is easy to be crushed with respect to an impact load, and a sufficient impact absorption effect can be obtained. Moreover, since the opening part is formed in the weak part, the width | variety of the surplus thickness in the periphery of an opening part is narrowed. Therefore, the crushing resistance in the fragile part when the fragile part is crushed is reduced. For this reason, crushing of a weak part can be promoted further.
In the impact absorption in the vehicle skeleton member, it is preferable that the crushing direction can be controlled in accordance with the position where the vehicle skeleton member is provided. Usually, the direction of crushing changes according to the width and area of the surplus in the part where crushing occurs. In the vehicle skeleton member of the present invention, the width and area of the excess wall around the opening can be adjusted by making the opening substantially polygonal. Therefore, the direction of crushing can be controlled.
Furthermore, the crushing resistance in each surface can be made different by providing the surface in which a weak part is formed, and the surface in which a weak part is not formed. Therefore, the direction of crushing can be controlled.

In addition, the main body portion is formed by four face plate portions, the cross section perpendicular to the longitudinal direction has a rectangular shape, and the weak portion is formed only on the two face plate portions facing each other. Can do.

Further, the main body portion is formed by four face plate portions, and a cross section perpendicular to the longitudinal direction thereof is rectangular, and the weak portion can be formed in only one face plate portion. .

Further, the seat屈誘Department of a pair may be a mode that is formed on the ridge line extending in the longitudinal direction of the main body portion.

  The ridge line extending in the longitudinal direction of the main body has a higher strength against a collision load than that of the flat surface, and most of the impact load F is transmitted in a concentrated manner. In the vehicle skeleton member of the present invention, since the buckling induction portion is formed on the ridgeline, the strength of the ridgeline is partially reduced, and most of the impact load is concentrated on the portion where the strength is reduced. Therefore, the buckling induction part tends to be a buckling base point that induces buckling before the weak part. Therefore, it can be more easily crushed against an impact load.

  Moreover, it is preferable that the frame member for vehicles of this invention is used as a front side member of a vehicle.

  According to this aspect, when an impact load acts on the front portion of the vehicle, a sufficient impact absorbing effect can be obtained at the front portion of the vehicle.

  The vehicle skeleton member according to the present invention is easily crushed against an impact load, and a sufficient impact absorbing effect can be obtained.

It is a perspective view of the front side member concerning a reference form. It is a perspective view which shows the crushing state when the front side member of FIG. 1 receives the impact load. It is a perspective view of the front side member concerning a 1st embodiment. It is a perspective view which shows the crushing state when the front side member of FIG. 3 receives the impact load. It is a perspective view of the front side member concerning a 2nd embodiment. It is a perspective view of the front side member which concerns on 3rd Embodiment.

Hereinafter, a vehicle skeleton member according to a reference embodiment and an embodiment of the present invention will be described in detail. In each form state, elements having the same function are denoted by the same reference numerals, and redundant description will be omitted. In the following description of the shape states, skeletal member for a vehicle, provided along the vehicle longitudinal direction at the front of the vehicle, it will be described when used as a front side member.

FIG. 1 is a perspective view of a front side member according to a reference embodiment. The front side member which concerns on a reference form is used for frame | skeleton formation of a vehicle front part. The front side member is provided along the vehicle front-rear direction at the front portion of the vehicle. As shown in FIG. 1, the main body 1 of the front side member M1 is formed in a hollow shape by an upper surface plate 2, a left side surface plate 3, a right side surface plate 4, and a bottom surface plate 5, all of which are made of steel plates. Further, the front side member M1 has a long shape along the vehicle longitudinal direction. A cross section perpendicular to the vehicle front-rear direction of the main body portion 1 formed in this way has a rectangular shape.

  A pair of beads 7 are formed on the ridge lines 6 on both sides of the top plate 2 so as to be separated along the vehicle longitudinal direction. Similarly, a pair of beads 7 are formed on the ridge lines 6 on both sides of the bottom plate 5 so as to be spaced apart in the vehicle longitudinal direction. The bead 7 formed on the ridge line 6 on both sides of the top plate 2 and the bead 7 formed on the ridge line 6 on both sides of the bottom plate 5 have substantially the same position in the vehicle front-rear direction. Each bead 7 corresponds to a buckling induction part.

  Further, weak portions are formed between the beads 7 on each surface of the top plate 2, the left side plate 3, the right side plate 4, and the bottom plate 5. A substantially square opening 8 is formed in the fragile portion. In other words, the opening 8 is formed so as to be surrounded by the bead 7 on the surface including the bead 7. By forming the opening 8 in the fragile portion in this manner, the remaining portions of the top plate 2, the left side plate 3, the right side plate 4, and the bottom plate 5 are narrowed.

  A case where an impact load in the vehicle front-rear direction is applied to the main body 1 of the front side member M1 having such a configuration will be described. FIG. 2 is a perspective view showing a collapsed state when the front side member M1 receives an impact load. As shown in FIG. 2, when an impact load F acts on the main body 1 of the front side member M1 from the front of the vehicle, first, buckling occurs with the bead 7 formed on each ridge line 6 as a base point. By this buckling, the stress transmitted through the main body 1 is transmitted from the bead 7 to the weakened part formed between the beads 7.

  Here, the width of the surplus around the opening 8 is narrowed. Therefore, the weakened portion has a low strength against the stress transmitted by the impact load F. In other words, the vulnerable part is easily crushed. Therefore, when the stress due to the impact load F is transmitted to the fragile portion, the stress acts intensively on the excess space around the opening 8. Due to the concentrated action of the stress, the weak part is crushed as a whole. A sufficient impact absorbing effect can be obtained in the front side member M1 by the overall crushing of the fragile portion.

Thus, in the front side member M1 of the reference form, the bead 7 has a function of inducing buckling when the impact load F acts in the vehicle front-rear direction. Moreover, the weak part has a function which promotes crushing.

As described above, in the front side member M1 of the reference embodiment, the pair of beads 7 that are separated from each other in the longitudinal direction of the main body 1 that is the longitudinal direction of the main body 1 are formed in the main body 1 so When the load F acts, buckling occurs with the bead 7 as a base point. When such buckling occurs, a load is transmitted to the fragile portion formed between the beads 7, and the fragile portion is crushed as a whole. Therefore, the impact load F is easily crushed, and a sufficient impact absorption effect can be obtained.

  Moreover, since the opening part 8 is formed in the weak part, the width | variety of the surplus thickness in the periphery of the opening part 8 is narrowed. Therefore, the crushing resistance in the fragile part when the fragile part is crushed is reduced. For this reason, crushing of a weak part can be promoted further.

  Further, the ridge line 6 extending in the vehicle front-rear direction has a higher strength against the collision load F than that of the flat portion such as the upper surface plate 2, and most of the impact load F is transmitted in a concentrated manner. In the front side member M1, since the bead 7 is formed on the ridgeline 6, the strength of the ridgeline 6 is partially reduced, and most of the impact load F is concentrated on the portion where the strength is reduced. Therefore, the bead 7 tends to be a buckling base point that induces buckling before the fragile portion. Therefore, it can be more easily crushed against the impact load F.

  Moreover, according to the front side member M1, when the impact load F acts on the front part of the vehicle, a sufficient impact absorption effect can be obtained at the front part of the vehicle.

FIG. 3 is a perspective view of the front side member according to the first embodiment. The front side member M2 according to the first embodiment is different from the front side member M1 shown in FIG. 1 in that the weakened portion is formed only on the top surface plate 2 and the bottom surface plate 5. In the front side member M2, the left side plate 3 and the right side plate 4 are not formed with weak portions. The other points are the same as those of the front side member M1.

  When an impact load F acts on the main body 1 of the front side member M2 from the front of the vehicle, buckling occurs with the bead 7 formed on each ridge line 6 as a base point as shown in FIG. By this buckling, the stress transmitted through the main body 1 is transmitted from the bead 7 to the fragile portions formed on the top plate 2 and the bottom plate 5, the left side plate 3, and the right side plate 4.

  Here, in the top surface plate 2 and the bottom surface plate 5, the width of the margin around the opening 8 is narrowed. Therefore, the strength of the top surface plate 2 and the bottom surface plate 5 is lower than that of the left side surface plate 3 and the right side surface plate 4 where the fragile portion is not formed. Further, in the left side plate 3 and the right side plate 4, the entire surface becomes surplus and the crushing resistance increases. Therefore, when the stress due to the impact load F is transmitted, the left side plate 3 and the right side plate 4 are only slightly deformed. On the other hand, in the top plate 2 and the bottom plate 5, the fragile portion is crushed. A sufficient impact absorbing effect can be obtained by this crushing. In this case, as shown in FIG. 4, the weak part surrounded by the bead 7 is crushed upward.

  Thus, in the front side member M2 of this embodiment, the crushing resistance in each surface can be made different by providing the surface in which a weak part is formed, and the surface in which a weak part is not formed. Therefore, the direction of crushing can be controlled.

Further, as an embodiment of the present invention, a front side member M3 according to a second embodiment as shown in FIG. 5 may be used. In the front side member M3, a weak portion is formed only on the upper surface plate 2. An opening 9 having a substantially parallelogram shape is formed in the fragile portion. Furthermore, it can also be set as the front side member M4 which concerns on 3rd Embodiment as shown in FIG. In the front side member M4, a fragile portion is formed only on the upper surface plate 2. A substantially regular hexagonal opening 10 is formed in the fragile portion.

  In the front side member M3 and the front side member M4, since the weak portion is formed only on the upper surface plate 2, the upper surface plate 2 is largely crushed when an impact load is applied from the front of the vehicle. For this reason, the main body 1 is bent so as to protrude downward. A sufficient impact absorbing effect can be obtained by this bending. Moreover, since the opening 9 and the opening 10 are different in the width and area of the surplus remaining in the periphery, the crushing direction of the upper surface plate 2 can be changed.

  In this way, by making the opening portion into a substantially polygonal shape such as a parallelogram or a substantially hexagonal shape, it is possible to adjust the width and area of the excess wall around the openings 9 and 10. By adjusting the width and area of the surplus, the crushing resistance on the surface on which the openings 9 and 10 are formed can be made different, so that the crushing direction can be controlled.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment. For example, although the case where the cross section perpendicular | vertical to the vehicle front-back direction of the main body part 1 was a rectangular shape was demonstrated in the said embodiment, a pentagon and a hexagon may be sufficient, for example. Moreover, although the said embodiment demonstrated the case where the bead 7 was formed in each of the ridgeline 6 of the both sides of the upper surface board 2, and the ridgeline 6 of the both sides of the bottom face board 5, only the ridgeline 6 of the both sides of the upper surface board 2 was demonstrated. A pair of beads 7 may be formed, or a combination of other surfaces.

  Further, the opening formed between the beads 7 may reach the ridge line 6. Further, the buckling induction portion is not limited to the bead 7 but may be one in which the ridge line 6 is curved in an R shape, or may be formed so as to cross over a flat portion such as the upper surface plate 2. Good. Furthermore, the vehicle skeleton member of the present invention may be used for forming the skeleton of the rear bumper at the rear of the vehicle, or may be provided along the vehicle front-rear direction or the vertical direction. Furthermore, a plurality of buckling induction portions may be provided at arbitrary locations.

  DESCRIPTION OF SYMBOLS 1 ... Main-body part, 2-5 ... surface, 6 ... Ridge line, 7 ... Bead (buckling induction part), 8-10 ... Opening part, M1-M4 ... Front side member (skeleton member for vehicles).

Claims (5)

A vehicle skeleton member used for vehicle skeleton formation,
It has a long shape, is formed in a hollow shape by a plurality of face plate portions, and includes a main body portion whose cross section perpendicular to the longitudinal direction forms a polygonal shape ,
A pair of buckling induction parts that are separated along the longitudinal direction of the main body part is formed in the main body part,
Between the pair of buckling induction portions, at least one face plate portion is formed with a weak portion having a substantially polygonal opening , and the other face plate portion is formed with the weak portion. A skeletal member for a vehicle, characterized in that there is no . The main body portion is formed by four face plate portions, and a cross section perpendicular to the longitudinal direction has a rectangular shape,
The skeleton member for a vehicle according to claim 1, wherein the fragile portion is formed only on two facing face plate portions. The main body portion is formed by four face plate portions, and a cross section perpendicular to the longitudinal direction has a rectangular shape,
The vehicle skeleton member according to claim 1, wherein the fragile portion is formed only on one face plate portion. Before Symbol pair of seat屈誘Department, the formed longitudinally extending ridge of the body portion, the vehicle frame member according to any one of claims 1 to 3.   The vehicle skeleton member according to any one of claims 1 to 4, which is used as a front side member of the vehicle.

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