JP5157809B2 - Suspension member structure for vehicles - Google Patents

Description

  The present invention relates to a vehicle suspension member structure.

Conventionally, the following is known as a suspension member structure for vehicles (for example, refer to patent documents 1). That is, Patent Document 1 discloses a structure having a subframe that supports a front wheel via a lower arm.
Japanese Unexamined Patent Publication No. 2004-114413 (FIGS. 1 and 2) JP-A-6-298121 JP-A-8-85473

  However, in the example described in Patent Document 1, for example, when a colliding body directly collides with the front wheel from the front side in the vehicle front-rear direction, a rotational moment acts on the lower arm, and the connection portion with the lower arm in the subframe is applied. When the load is input to the inner side in the vehicle width direction, the sub frame folds horizontally (the sub frame folds so that the connecting portion with the lower arm is located on the inner side in the vehicle width direction with respect to both ends of the sub frame in the vehicle longitudinal direction). ) May occur.

  And when a side fold occurs in the subframe in this way, the front wheels are moved rearward in the vehicle front-rear direction and inward in the vehicle width direction, and the passenger compartment may be deformed accordingly.

  The present invention has been made in view of the above-described facts. For example, even when a collision body directly collides with a wheel, the wheel is prevented from being moved to one side in the vehicle front-rear direction and inside in the vehicle width direction. An object of the present invention is to provide a suspension member structure for a vehicle that can be used.

In order to solve the above-mentioned problem, the suspension member structure for a vehicle according to claim 1 is disposed on the inner side in the vehicle width direction with respect to the wheels and extends in the vehicle front-rear direction, and at least one side in the vehicle front-rear direction has a support portion. A suspension side member supported by the vehicle body via the vehicle, a connecting portion for connecting the suspension arm for supporting the wheel to the suspension side member on the other side in the vehicle longitudinal direction with respect to the support portion so as to be rotatable in the vehicle vertical direction, A bead that is formed in a concave shape in an upper wall or a lower wall of a vehicle front-rear direction intermediate portion between the connecting portion and the support portion of the suspension side member, and extends in the vehicle width direction, and the vehicle front-rear direction of the suspension side member And the bead is formed between the connecting portion and the bead. And a bulging portion which bulges formed on the upper wall or the lower wall, the connecting portion, a first connecting the suspension arm to the suspension side members in the vehicle longitudinal direction on both sides with respect to the rotational axis of the wheel The bead is configured as a connecting portion and a second connecting portion, and the end of the bead in the vehicle width direction is open to the inside of the suspension side member in the vehicle width direction, and the end of the vehicle width direction outside is the upper wall or the lower wall And the bulging portion extends from the vehicle width direction inner side of the upper wall or the lower wall to the vehicle width direction inner side and the vehicle width direction outer side of the upper wall or the lower wall. It has the ridgeline which goes to the area | region between these edge parts .

  The vehicle suspension member structure of the present invention can be applied to the front or rear suspension member of the vehicle. In the present invention, the vehicle suspension member structure is the front side of the vehicle. When the vehicle suspension member structure is applied to the rear suspension member of the vehicle, the vehicle suspension member structure corresponds to the vehicle front-rear direction front side.

  In the vehicle suspension member structure according to claim 1, for example, when a collision body directly collides with a wheel from the other side (for example, the front side) in the vehicle front-rear direction, the vehicle is moved to one side (for example, the rear side) in the vehicle front-rear direction. Load is input. The load input to the wheels is transmitted to the connecting portion via the suspension arm, whereby the load is input to the suspension side member from the connecting portion to one side in the vehicle front-rear direction.

  Here, in the vehicle suspension member structure according to the first aspect, the concave bead is formed on the upper wall or the lower wall of the vehicle front-rear direction intermediate portion of the suspension side member so as to extend in the vehicle width direction. . In other words, this bead is bent vertically on the suspension side member (the suspension side member so that the middle part in the vehicle front-rear direction between the connecting part and the supporting part of the suspension side member is located below the connecting part and the supporting part in the vehicle front-rear direction). The suspension side member is set so as to be the starting point of the member being folded. Moreover, since the bulging part is formed in the upper wall or lower wall in which this bead was formed, in this suspension side member, the yield strength difference arises in the cross section by the bead and the bulging part.

  Therefore, as described above, when a load is input to the suspension side member from the connecting portion to one side in the vehicle front-rear direction (for example, the rear side), the suspension side member is induced to bend vertically from the bead. Is done.

  When a vertical fold occurs at the suspension side member starting from the bead, the wheel is moved to one side (for example, the rear side) of the vehicle in the longitudinal direction of the vehicle along with the vertical folding of the suspension side member. Moving to one side and the inside in the vehicle width direction is suppressed.

  Thus, according to the suspension member structure for a vehicle according to claim 1, for example, even when a collision body directly collides with the wheel, the wheel is moved to one side in the vehicle front-rear direction and inside in the vehicle width direction. Can be suppressed.

In the suspension member structure for a vehicle according to claim 1 , for example, when a collision body directly collides with a wheel from the other side (for example, the front side) in the vehicle front-rear direction, the vehicle front and rear with respect to the wheel after the initial stage of the collision. A load is input to one side of the direction (for example, the rear side).

Here, in the vehicle suspension member structure according to claim 1, the suspension arm are connected by first connection portion and a second connection portion to the suspension side members in the longitudinal direction on both sides the vehicle relative to the axis of rotation of the wheel.

  Therefore, as described above, when a load is input to one side of the vehicle in the longitudinal direction of the vehicle (for example, the rear side), the rotational moment acts on the suspension arm, and the suspension side member A load is input to the inner side in the vehicle width direction from the two connecting portions.

However, in the suspension member structure for a vehicle according to the first aspect , the bead is configured such that an end portion on the outer side in the vehicle width direction terminates at an intermediate portion in the vehicle width direction on the upper wall or the lower wall. That is, in other words, the region between the end of the bead on the upper wall or the lower wall and the end on the outer side in the vehicle width direction is left as a remaining portion without a bead.

  Therefore, as described above, even when a load is input to the suspension side member from the second connecting portion to the inside in the vehicle width direction, the proof strength is secured in the remaining portion without the bead. Lateral folding (suspension side member folding inward in the vehicle width direction starting from the bead) is suppressed.

Thus, according to the vehicle suspension member structure according to claim 1, for example, an impact body to the wheels is the vehicle longitudinal direction other side (e.g., front side) in the collision initial stage of a collision directly from the suspension side members It is possible to suppress the occurrence of lateral folding.

Further, in the vehicle suspension member structure according to claim 1 , in the middle of the collision after the collision has progressed from the initial stage of the collision described above, for example, the wheel rides on the collision body, so that the suspension arm is moved upward in the vehicle vertical direction. It is rotated. In this case, when the rotation of the suspension arm in the vehicle vertical direction is restricted by the connecting portion, a torsional moment acts on the suspension side member around the vehicle longitudinal axis.

Here, in the vehicle suspension member structure according to claim 1 , the bulging portion extends from the inner side in the vehicle width direction on the upper wall or the lower wall toward the one side in the vehicle front-rear direction from the end of the bead and the outer side in the vehicle width direction. It has a ridge line toward the region between the ends.

  Therefore, as described above, when a torsional moment is applied to the suspension side member around the vehicle longitudinal axis, a load is transmitted along the ridgeline of the bulging portion. Then, the load transmitted along the ridge line of the bulging portion causes the above-described remaining portion to be collapsed, and the vertical folding of the suspension side member starting from the bead is more effectively induced.

Thus, according to the suspension member structure for a vehicle of the first aspect , the vertical folding of the suspension side member starting from the bead is more effective after the middle stage of the collision in which the collision has progressed from the initial stage of the collision. Can be triggered.

  As described above in detail, according to the present invention, for example, even when a collision body directly collides with a wheel, it is possible to suppress the wheel from moving to one side in the vehicle front-rear direction and inside in the vehicle width direction.

  Hereinafter, an embodiment of a suspension member structure for a vehicle according to the present invention will be described with reference to the drawings.

  FIG. 1 shows a front portion of a vehicle 12 to which a vehicle suspension member structure 10 according to an embodiment of the present invention is applied.

  The vehicle 12 is, for example, a small vehicle with an extremely short overhang. Further, the front suspension member 14 provided in the vehicle 12 is configured to be bilaterally symmetric, and only the left half of the front suspension member 14 is shown in FIG.

  In addition, an arrow FR, an arrow LH, and an arrow UP shown in each figure indicate the front side in the vehicle front-rear direction, the outer side in the vehicle width direction (left side), and the upper side in the vehicle vertical direction, respectively.

  As shown in this figure, the vehicle suspension member structure 10 is applied to a front suspension member 14. The front suspension member 14 is configured in a frame shape (well shape) having a suspension side member 16 and a pair of front and rear suspension cross members 18 and 20.

  The suspension side member 16 is disposed on the inner side in the vehicle width direction with respect to the front wheel 22 and extends in the vehicle front-rear direction. The front side in the vehicle front-rear direction of the suspension side member 16 is supported by a front side member (not shown) via the first support portion 24, and the rear side of the suspension side member 16 in the vehicle front-rear direction via the second support portion 26. Are supported by the above-mentioned front side member.

  The wheel 22 is supported by a suspension arm 28 (lower arm), and the inner side in the vehicle width direction of the suspension arm 28 is branched into a first arm 30 and a second arm 32. The first arm 30 and the second arm 32 are arranged side by side in the vehicle front-rear direction.

  The first arm 30 is coupled to the suspension side member 16 by the first coupling portion 34 so as to be rotatable in the vehicle vertical direction, and the second arm 32 is coupled to the suspension side member 16 by the second coupling portion 36. It is connected so that it can rotate in the vertical direction.

  The first connecting part 34 and the second connecting part 36 are positioned on both sides in the vehicle front-rear direction with respect to the rotation axis L when the wheel 22 is traveling straight, and between the first support part 24 and the second support part 26 in the vehicle front-rear direction. Is located.

  A bead 38 is formed on the upper wall 16 </ b> A of the suspension side member 16 at the intermediate portion in the vehicle longitudinal direction between the second connecting portion 36 and the second support portion 26. Furthermore, a bulging portion 40 is formed on the upper wall 16A of the suspension side member 16 between the second connecting portion 36 and the bead 38 in the vehicle front-rear direction.

  Here, FIG. 2 shows a vehicle front-rear direction intermediate portion of the suspension side member 16 in an enlarged perspective view of a main portion, and FIG. 3 shows a vehicle front-rear direction intermediate portion of the suspension side member 16 as a main portion. It is shown in an enlarged plan view.

  As shown in these drawings, the bead 38 is formed in a concave shape on the upper wall 16A of the suspension side member 16, and is formed so as to extend in the vehicle width direction. Further, the bead 38 has an end 38A on the inner side in the vehicle width direction that opens toward the inner side in the vehicle width direction of the suspension side member 16, and an end 38B on the outer side in the vehicle width direction terminates at an intermediate portion in the vehicle width direction on the upper wall 16A. It is configured. That is, a region between the terminal end (end portion 38B) of the bead 38 and the end portion (ridge line 16C) on the outer side in the vehicle width direction on the upper wall 16A is left as a remaining portion 42 without the bead 38.

  On the other hand, the bulging portion 40 is formed to bulge upward in the vehicle vertical direction on the upper wall 16A of the suspension side member 16, and is formed in a substantially triangular shape in plan view. The bulging portion 40 has a ridge line 40C, 40D (a ridge line corresponding to a hypotenuse of a triangle) that is a boundary between the bulging end surface 40A and the side surface 40B, and the ridge line 40C on the vehicle width direction outer side is the rear side in the vehicle front-rear direction. The vehicle is configured so as to go from the vehicle width direction inner side (vehicle width direction center portion) of the upper wall 16A toward the above-described remaining portion 42 as it goes to the above.

  FIG. 4 shows the above-described second connecting portion 36 in a cross-sectional view. As shown in this figure, the second connecting portion 36 includes a support wall portion 44 coupled to the suspension side member 16 and an upper wall portion 46 supported by the support wall portion 44. Yes.

  In the second connecting portion 36, when the suspension arm 28 is turned upward by a predetermined angle or more in the vehicle vertical direction, the upper wall portion 46 interferes with the suspension arm 28, and the suspension arm 28 is moved upward in the vehicle vertical direction. It is set as the structure which controls rotation to. Further, the above-described first connecting portion 34 is configured similarly to the second connecting portion 36.

  In the embodiment of the present invention, the above-described bead 38, the bulging portion 40 (including the ridge line 40C), and the remaining portion 42 constitute a vertical folding inducing portion in the present invention.

  Next, the operation and effect of the vehicle suspension member structure 10 according to the embodiment of the present invention will be described.

  First, in order to clarify the operation and effect of the vehicle suspension member structure 10 according to the embodiment of the present invention, a vehicle suspension member structure 110 according to a comparative example will be described. FIG. 9 shows a vehicle suspension member structure 110 according to a comparative example.

  The vehicle suspension member structure 110 according to this comparative example is configured such that the above-described bead 38 and the bulging portion 40 are omitted from the vehicle suspension member structure 10 according to the above-described embodiment of the present invention. .

  However, in the vehicle suspension member structure 110 according to this comparative example, for example, when a front collision occurs in the vehicle 112 and the collision body 50 directly collides with the front wheel 122 from the front side in the vehicle front-rear direction, the suspension member 128 rotates. Along with the action of the moment M3, a load F5 is input to the suspension side member 116 from the second connecting portion 136 to the inside in the vehicle width direction.

  Then, the suspension side member 116 is laterally folded (the suspension side member 116 is folded so that the second connecting portion 136 is located on the inner side in the vehicle width direction with respect to the first support portion 124 and the second support portion 126). There is a fear.

  Further, when the suspension side member 116 is laterally folded as described above, the wheels 122 are moved rearward in the vehicle front-rear direction and inward in the vehicle width direction, and accordingly, the passenger compartment 148 may be deformed.

  On the other hand, the vehicle suspension member structure 10 according to the embodiment of the present invention has the following advantageous effects over the vehicle suspension member structure 110 according to the comparative example described above.

  That is, as shown in FIG. 1, in the vehicle suspension member structure 10 according to an embodiment of the present invention, for example, a frontal collision occurs in the vehicle 12, and the collision body 50 is directly on the wheel 22 from the front side in the vehicle longitudinal direction. In the case of a collision, a load F1 is input to the wheel 22 on the rear side in the vehicle front-rear direction after the initial collision.

  Here, in the vehicle suspension member structure 10 according to the embodiment of the present invention, the suspension arm 28 is connected to the suspension side member 16 on the both sides in the vehicle front-rear direction with respect to the rotation axis L of the wheel 22 and the second connection 34 and the second connection. The parts 36 are connected.

  Therefore, as described above, when the load F1 is input to the rear side in the vehicle front-rear direction with respect to the wheel 22, the second moment with respect to the suspension side member 16 is accompanied by the rotational moment M1 acting on the suspension arm 28. A load F2 is input from the connecting portion 36 to the inside in the vehicle width direction.

  However, in the vehicle suspension member structure 10 according to the embodiment of the present invention, the bead 38 has an end 38B on the outer side in the vehicle width direction at the middle in the vehicle width direction on the upper wall 16A, as shown in FIGS. It is set as the structure which terminates in a part. And the area | region between the terminal end (end part 38B) of the bead 38 in 16 A of upper walls and the edge part (ridgeline 16C) of the vehicle width direction outer side is left as the remaining part 42 without the bead 38. FIG.

  Therefore, as described above, even when the load F2 is input to the suspension side member 16 from the second connecting portion 36 to the inside in the vehicle width direction, the remaining portion 42 (including the ridge line 16C) without the bead 38 has a yield strength. Therefore, the lateral folding of the suspension side member 16 (the suspension side member 16 folding inward in the vehicle width direction starting from the bead 38) is suppressed.

  Further, in the vehicle suspension member structure 10 according to the embodiment of the present invention, when the load F1 is input to the rear side in the vehicle longitudinal direction with respect to the wheel 22, as described above, the load F1 input to the wheel 22 is input. Is transmitted to the first connecting portion 34 and the second connecting portion 36 via the suspension arm 28, whereby the rear side in the vehicle front-rear direction from the first connecting portion 34 and the second connecting portion 36 to the suspension side member 16. The load F3 is input to.

  Here, in the vehicle suspension member structure 10 according to the embodiment of the present invention, the concave bead 38 is formed on the upper wall 16A of the vehicle front-rear direction intermediate portion of the suspension side member 16 so as to extend in the vehicle width direction. Has been.

  That is, the bead 38 is folded vertically of the suspension side member 16 (the intermediate portion in the vehicle front-rear direction between the second connection portion 36 and the second support portion 26 of the suspension side member 16 is the second connection portion 36 and the second support portion 26. The suspension side member 16 is set so as to be a starting point for the suspension side member 16 to be folded so as to be positioned on the lower side in the vehicle front-rear direction (see FIG. 5).

  Further, since the bulging portion 40 is formed on the upper wall 16A where the bead 38 is formed, in the suspension side member 16, there is a difference in yield strength between the bead 38 and the bulging portion 40. .

  Therefore, as described above, when the load F3 is input to the suspension side member 16 from the first connecting portion 34 and the second connecting portion 36 to the rear side in the vehicle front-rear direction, the bead 38 is attached to the suspension side member 16. A vertical fold as a starting point is induced.

  Furthermore, in the vehicle suspension member structure 10 according to one embodiment of the present invention, for example, the wheel 22 rides on the collision body 50 after the collision has progressed from the initial stage of the above-described collision, whereby the suspension arm 28 is moved. Is rotated upward in the vehicle vertical direction.

  In this case, the upper wall portion 46 of the second connecting portion 36 shown in FIG. 2 interferes with the suspension arm 28, and the rotation of the suspension arm 28 upward in the vehicle vertical direction is restricted (the first connecting portion). Similarly, the torsional moment M2 acts on the suspension side member 16 around the vehicle longitudinal axis.

  Here, in the vehicle suspension member structure 10 according to the embodiment of the present invention, the bulging portion 40 extends from the vehicle width direction inner side (vehicle width direction center portion) of the upper wall 16A toward the rear side in the vehicle front-rear direction. A ridge line 40 </ b> C directed to the remaining portion 42 is provided.

  Therefore, as described above, when the torsional moment M2 acts on the suspension side member 16 around the vehicle longitudinal axis, the load F4 is transmitted along the ridge line 40C of the bulging portion 40 accordingly. Is done. The remaining portion 42 (including the ridge line 16C) is collapsed by the load F4 transmitted along the ridge line 40C of the bulged part 40, and the vertical folding of the suspension side member 16 starting from the bead 38 is further increased. Effectively triggered.

  When the vertical folding (see FIG. 5) occurs at the suspension side member 16 with the bead 38 as the starting point, as shown in FIG. The wheel 22 is moved as it is, and the movement of the wheel 22 to the rear side in the vehicle front-rear direction and to the inner side in the vehicle width direction is suppressed.

  Thus, according to the vehicle suspension member structure 10 according to the embodiment of the present invention, for example, in the initial stage of the collision in which the collision body 50 directly collides with the wheel 22 from the front side in the vehicle front-rear direction, the suspension side member 16 Further, it is possible to more effectively induce the vertical folding of the suspension side member 16 with the bead 38 as a starting point after the middle stage of the collision in which the collision has progressed from the initial stage of the collision.

  Then, by causing the suspension side member 16 to bend vertically with the bead 38 as a starting point, for example, even when the collision body 50 directly collides with the wheel 22, the wheel 22 is rearward in the vehicle front-rear direction and in the vehicle width direction inner side. It can suppress moving. Thereby, even if it is the vehicle 12 whose overhang is extremely short, it can suppress that the compartment 48 deform | transforms.

  Here, FIG. 7 shows a comparison of shock absorbing performance between the vehicle 12 to which the vehicle suspension member structure 10 according to the embodiment of the present invention is applied and a conventional vehicle.

  In this figure, a graph G1 shows a vehicle 12 to which the vehicle suspension member structure 10 according to one embodiment of the present invention is applied, and a graph G2 shows a conventional vehicle. The vertical axis represents the load F input to the collision body at the time of the vehicle collision, and the horizontal axis represents the deformation amount S accompanying the vehicle collision.

  In addition, the conventional vehicle is not a type in which the overhang is extremely short like the vehicle according to the embodiment of the present invention, but a type in which the overhang is sufficiently secured. This type of vehicle is usually configured to absorb shock by a front side member during a frontal collision.

  As shown in FIG. 7, according to the vehicle suspension member structure 10 according to the embodiment of the present invention, as described above, the suspension side member 16, the suspension arm 28, Since the impact is absorbed by the wheels 22, the load at the initial stage of the collision can be ensured in the same manner or more than in the conventional vehicle.

  As mentioned above, although one Embodiment of this invention was described, this invention is not limited above, Of course, it can change and implement variously within the range which does not deviate from the main point. .

  For example, in the above embodiment, the vehicle suspension member structure 10 is applied to the front suspension member 14 provided in the front portion of the vehicle 12, but is applied to the rear suspension member provided in the rear portion of the vehicle 12. Also good.

  In the above embodiment, the bead 38 and the bulging portion 40 are formed on the upper wall 16A of the suspension side member 16, but are formed on the lower wall 16B of the suspension side member 16 as shown in FIG. May be. In this case, the second connecting portion 36 may also be provided on the lower wall 16 </ b> B of the suspension side member 16, or may be provided on the side wall of the suspension side member 16. Even if comprised in this way, there can exist an effect similar to the above.

  Moreover, in the said embodiment, although the bulging part 40 was formed in the substantially triangular shape by planar view, if it is the shape which has the ridgeline 40C, you may be formed in the other shape.

1 is a plan view showing a front portion of a vehicle to which a vehicle suspension member structure according to an embodiment of the present invention is applied. FIG. 2 is an enlarged perspective view of a main part of a vehicle front-rear direction intermediate part in the suspension side member shown in FIG. 1. FIG. 2 is an enlarged plan view of a main part of a vehicle front-rear direction intermediate portion in the suspension side member shown in FIG. 1. FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. It is a figure explaining a mode that the suspension side member shown by FIG. 1 bends vertically. It is a figure explaining a mode that the suspension side member shown by FIG. 1 bends vertically. It is a figure which shows the comparison of the shock absorption performance of the vehicle to which the suspension member structure for vehicles which concerns on one Embodiment of this invention was applied, and the conventional vehicle. It is a figure which shows the modification of the suspension member structure for vehicles which concerns on one Embodiment of this invention. It is a figure explaining a mode that a suspension side member is folded sideways in the suspension member structure for vehicles concerning a comparative example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Suspension member structure 16 for vehicles Suspension side member 22 Wheel 24 First support part 26 Second support part (support part)
28 Suspension arm 34 First connection part (connection part)
36 Second connecting part (connecting part)
38 beads (longitudinal folding induction part)
40 Swelling part (vertical folding induction part)
40C Ridge 42 Remaining part (vertical folding induction part)

Claims (1)

A suspension side member that is disposed on the vehicle width direction inner side with respect to the wheels, extends in the vehicle front-rear direction, and at least one side in the vehicle front-rear direction is supported by the vehicle body via the support part,
A connecting portion for connecting a suspension arm for supporting the wheel to the suspension side member so as to be rotatable in the vehicle vertical direction on the other side in the vehicle longitudinal direction with respect to the support portion;
A bead that is formed in a concave shape in an upper wall or a lower wall of the vehicle front-rear direction intermediate portion between the coupling portion and the support portion in the suspension side member, and extends in the vehicle width direction;
A bulging portion that is located between the connecting portion and the bead in the vehicle front-rear direction of the suspension side member, and that is bulged on the upper wall or the lower wall on which the bead is formed;
Equipped with a,
The connecting portion is a first connecting portion and a second connecting portion that connect the suspension arm to the suspension side member on both sides in the vehicle front-rear direction with respect to the rotation axis of the wheel,
The bead is configured such that an end portion on the inner side in the vehicle width direction opens to the inner side in the vehicle width direction on the suspension side member, and an end portion on the outer side in the vehicle width direction terminates at an intermediate portion in the vehicle width direction on the upper wall or the lower wall. And
The bulging portion has a ridge line from the inner side in the vehicle width direction on the upper wall or the lower wall toward the region between the terminal end of the bead and the outer end portion in the vehicle width direction as it goes to one side in the vehicle longitudinal direction. Configured,
Suspension member structure for vehicles.

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