JP5552994B2 - Side member structure - Google Patents

Description

  The present invention relates to a side member structure installed on a vehicle body.

  As a conventional side member structure, for example, as described in Patent Document 1, a structure in which a plurality of concave beads extending in a direction perpendicular to the longitudinal direction of the side member is provided on the side member is known.

JP-A-55-136660

  In the above prior art, when a load is input to the side member in the longitudinal direction, the side member is deformed into a bellows shape by the concave bead, so that the impact can be absorbed. However, when a load is input to the side member in an oblique direction, compression of the surface portion side to which the load is input is promoted, and the side member is not uniformly deformed in the longitudinal direction. Have difficulty.

  An object of the present invention is to provide a side member structure that can sufficiently absorb an impact even when a load is input to the side member in an oblique direction.

The side member structure of the present invention is provided on the side member so as to extend in a direction perpendicular to the longitudinal direction of the side member of the cylindrical body having a rectangular cross section, and the front end portion of the side member extends from the longitudinal direction of the side member. a plurality of first fold line portion for deforming bending of the side member when the load is applied, is provided to the side member so as to extend obliquely to the longitudinal direction of the side members, the side at the front end of the side member and a second fold line portions more for the modified broken by the first fold line portion is deformed folding the side members in different directions when a load from the oblique direction with respect to the longitudinal direction of the member is inputted, first The broken line portion is a concave groove formed on the outer wall surface or inner wall surface of the side member over the entire circumference, and the second broken line portion is a pair of inner wall surfaces facing the side member. Is a concave groove formed continuously in a wavy shape along the longitudinal direction of the side member on a pair of opposed outer wall surfaces, and the position of the inflection portion of the second broken line portion is the position of the plurality of first bent line portions. It corresponds to the position .

In side member structure of the present invention, when a load from longitudinal Saidomen bar to the front end portion of the side members is input, along a first fold line extending in a direction perpendicular to the longitudinal direction of the side member The side member is folded and deformed. On the other hand, when a load from an oblique direction with respect to the longitudinal direction of the side member is input to the front end portion of the side member , the side member is folded along the second fold line portion extending obliquely with respect to the longitudinal direction of the side member. And deform. For this reason, even when a load is input to the side member in an oblique direction, the side member is crushed in a stable manner as in the case where the load is input to the side member in the longitudinal direction, so that the shock is sufficiently absorbed. Can do.

Further, by making the first broken line portion and the second bent line portion into concave grooves, the side members can be easily folded along the first bent line portion and the second bent line portion, and the first bent line portion and the second bent line portion can be easily formed. Can be formed.

Furthermore, when a load is input to the side member in an oblique direction, the side member is folded and deformed along the wavy second broken line portion, so that the side member is more stably crushed.

  According to the present invention, even when a load is input to the side member in an oblique direction, an impact can be sufficiently absorbed as in the case where a load is input to the side member in the longitudinal direction.

It is a perspective view showing an outline of one embodiment of a side member structure concerning the present invention. FIG. 2 is a development view of an outer wall surface and an inner wall surface of the side member shown in FIG. 1. It is a perspective view which shows the general appearance of the conventional general side member structure as a comparative example. It is sectional drawing which shows the deformation | transformation direction of the side member in which the broken line groove | channel shown in FIG. 1 was formed. It is an expanded view and sectional drawing when a side member is folded in accordion shape.

  Preferred embodiments of the side member structure according to the present invention will be described below in detail with reference to the drawings.

  FIG. 1 is a perspective view showing an overview of an embodiment of a side member structure according to the present invention. In the same figure, the side member structure of this embodiment is a structure of the front side member arrange | positioned so that it may extend in the front-back direction at the left-right both sides of a vehicle body. In the following description, the front side member is simply referred to as a side member.

  The side member 1 is a cylindrical body having a rectangular cross section. The side member 1 has a pair of outer wall surfaces 2a and a pair of outer wall surfaces 2b, a pair of inner wall surfaces 3a and a pair of inner wall surfaces 3b. Each inner wall surface 3a faces each other, and each inner wall surface 3b faces each other. Each outer wall surface 2a is a surface opposite to each inner wall surface 3a, and each outer wall surface 2b is a surface opposite to each inner wall surface 3b.

  FIG. 2A is a development view of the outer wall surfaces 2a and 2b, and FIG. 2B is a development view of the inner wall surfaces 3a and 3b. 1 and 2, a plurality of broken line grooves 4 extending in a direction perpendicular to the longitudinal direction of the side member 1 are formed on each outer wall surface 2a. The broken line groove 4 is a groove having a V-shaped cross section (see FIG. 4) for bending and deforming the side member 1 when a load is input to the side member 1. Each broken line groove | channel 4 is arrange | positioned at equal intervals.

  A plurality of broken line grooves 5 extending in the direction perpendicular to the longitudinal direction of the side member 1 are formed in each outer wall surface 2b. The broken line groove 5 is a groove having a V-shaped cross section for bending and deforming the side member 1 when a load is input to the side member 1. Each broken line groove 5 is arranged at equal intervals every other broken line groove 4 so as to be connected to the broken line groove 4.

  A plurality of broken line grooves 6 extending in a direction perpendicular to the longitudinal direction of the side member 1 are formed in each inner wall surface 3b. The broken line groove 6 is a groove having a V-shaped cross section for bending and deforming the side member 1 when a load is input to the side member 1. Each broken line groove 6 is formed at a position corresponding to the center of each adjacent broken line groove 5. That is, each broken line groove 6 is arranged at equal intervals every other broken line groove 4.

  Each inner wall surface 3 a is formed with two broken line grooves 7 extending in a wave shape along the longitudinal direction of the side member 1. Each broken line groove 7 is a groove having a V-shaped cross section for bending and deforming the side member 1 in a direction different from the bending deformation caused by the broken line grooves 4 to 6 when a load is input to the side member 1.

  Each broken line groove 7 extends in an oblique direction with respect to the longitudinal direction of the side member 1. Specifically, each broken line groove 7 extends at an angle of 45 degrees with respect to the longitudinal direction of the side member 1 from the edge of the inner wall surface 3a (inner corner of the side member 1) toward the center of the inner wall surface 3a. ing. At this time, the position of the inflection part (mountain and valley) of the wavy broken line groove 7 corresponds to the position of each broken line groove 4.

  FIG. 3 is a perspective view showing an overview of a conventional side member structure as a comparative example. In FIG. 3, the above-mentioned broken line grooves 4 to 7 are not formed in the side member 10.

  When the load F1 from the longitudinal direction of the side member 10 is input to the front end of the side member 10, the side member 10 is deformed (axially compressed) in the longitudinal direction. However, when the load F2 from the oblique direction with respect to the longitudinal direction of the side member 10 is input to the front end of the side member 10, the side member 10 is simply crushed obliquely, so the input load F2 The deformation of the side member 10 is not stable.

  On the other hand, in the present embodiment, a plurality of broken line grooves 4 to 6 extending in a direction perpendicular to the longitudinal direction of the side member 1 are formed in the side member 1 and extending obliquely with respect to the longitudinal direction of the side member 1. Since a plurality of wavy broken line grooves 7 are formed in the side member 1, the following effects can be obtained.

  That is, when the load F1 from the longitudinal direction of the side member 1 is input to the front end of the side member 1, the side member 1 is folded along the broken line grooves 4 to 7 and deformed. At this time, as shown in FIG. 4, the side member 1 is folded to the opening side of the broken line grooves 4 to 7 starting from the bottom of the broken line grooves 4 to 7. Therefore, as a result, the side member 1 is compressed into an accordion shape.

  On the other hand, when a load F2 from an oblique direction with respect to the longitudinal direction of the side member 1 is input to the front end of the side member 1, the side member 1 is first folded along the broken line groove 7 and deformed. And since the side member 1 is further folded along the broken line grooves 4-7 and deform | transformed, it comes to compress as an accordion shape as a result.

  Thus, regardless of the direction in which the input load acts, the side member 1 buckles and deforms in an accordion shape, so that the deformation of the side member 1 is stabilized and the impact can be absorbed sufficiently.

Here, a developed view when the side member 1 is folded into an accordion shape is shown in FIG. 5A, and the AA sectional view and the BB sectional view of FIG. Shown in (c). There is the following relationship between the dimensions b, d before deformation of the side member 1 and the dimensions b ′, d ′ after deformation. Note that λ is a buckling wavelength.
b ′ = b−λ
d ′ = d−λ

  In order for the side member 1 to be folded into an accordion shape, the deformed dimensions b 'and d' must not be negative.

  Further, when only the broken line grooves 4 to 6 extending in the direction perpendicular to the longitudinal direction of the side member 1 are formed in the side member 1, the load F <b> 1 from the longitudinal direction of the side member 1 is input to the front end of the side member 1. When this is done, the side member 1 will collapse into a bellows shape. For this reason, the surplus space generated by the folding of the side member 1 remains as it is.

  In the present embodiment, the side member 1 is crushed into an accordion shape as described above by forming the broken line groove 7 extending obliquely with respect to the longitudinal direction of the side member 1 in the side member 1. It becomes difficult to produce surplus due to the folding of 1. Thereby, since the deformation of the side member 1 is performed satisfactorily, the deformation state of the side member 1 can be further stabilized.

  Furthermore, since the fold line grooves 4 and 5 are formed on the outer wall surfaces 2a and 2b of the side member 1, and the fold line grooves 6 and 7 are formed on the inner wall surfaces 3b and 3a of the side member 1, the side member 1 is folded. The direction can be controlled with good balance.

  The present invention is not limited to the above embodiment. For example, in the above-described embodiment, the inclination angle of the broken line groove 7 with respect to the longitudinal direction of the side member 1 is 45 degrees, but the inclination angle of the broken line groove 7 is not particularly limited to 45 degrees. For example, in order to cope with load input to the side member 1 on the opposite side, the front end of the side member 1 with respect to the longitudinal direction of the side member 1 (the longitudinal direction of the vehicle body) and the vehicle width direction center of the bumper at the front of the vehicle body The angle of the connecting line may be set to the inclination angle of the broken line groove 7.

  In the above embodiment, the fold line grooves 4 and 5 are formed on the outer wall surfaces 2a and 2b of the side member 1, and the fold line grooves 6 and 7 are formed on the inner wall surfaces 3b and 3a of the side member 1, respectively. 1 is formed on only one of the inner wall surface and the outer wall surface of the side member 1, and similarly, a broken line groove extending obliquely with respect to the longitudinal direction of the side member 1 is formed. It may be formed only on one of the inner wall surface and the outer wall surface of the side member 1.

  Further, in the above embodiment, the fold line grooves 4 to 7 are formed in the side member 1 in order to bend and deform the side member 1 when a load is input to the side member 1, but in order to bend and deform the side member 1. This structure is not limited to a concave groove. For example, by providing convex beads on the side member 1, regions (thick regions and thin regions) having different thicknesses may be formed on the side members 1. Further, the hardness of the side member 1 may be partially changed by forming a plurality of small holes in series with the side member 1, forming a notch in the side member 1, or quenching. In short, any structure that can easily bend and deform the side member 1 may be used.

  DESCRIPTION OF SYMBOLS 1 ... Side member, 2a, 2b ... Outer wall surface, 3a, 3b ... Inner wall surface, 4-6 ... Broken line groove | channel (1st broken line part), 7 ... Broken line groove | channel (2nd broken line part).

Claims (1)

A cylindrical member having a rectangular cross section is provided on the side member so as to extend in a direction perpendicular to the longitudinal direction of the side member, and a load from the longitudinal direction of the side member is input to a front end portion of the side member . A plurality of first broken lines for sometimes bending and deforming the side member;
Provided in the side member so as to extend obliquely with respect to the longitudinal direction of the side member, and when a load from an oblique direction with respect to the longitudinal direction of the side member is input to the front end portion of the side member, A plurality of second broken line portions for bending and deforming the side member in a direction different from the bending deformation by the first broken line portion ,
The first broken line portion is a concave groove formed on the outer wall surface or the inner wall surface of the side member over the entire circumference,
The second broken line portion is a concave groove continuously formed in a wave shape along the longitudinal direction of the side member on a pair of opposed inner wall surfaces or a pair of opposed outer wall surfaces of the side member,
The side member structure , wherein a position of the inflection portion of the second broken line portion corresponds to a position of the plurality of first broken line portions .

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