JP5867318B2 - Body front structure - Google Patents

Description

  The present invention relates to a vehicle body front structure.

  When the bumper reinforcement outer end in the vehicle width direction is deformed by a collision load input from the front of the vehicle body and hits the front wheel, the front attachment point of the suspension arm of the front wheel is detached from the side member. A configured vehicle body front structure has been conventionally proposed (see, for example, Patent Document 1).

JP 2003-146246 A

  The front wheel from which the front attachment point of the suspension arm is detached from the side member rotates about the rear attachment point of the suspension arm and hits the outrigger from the outside in the vehicle width direction. Direction).

  However, in the case of a vehicle not provided with an outrigger, the front wheel may directly hit the rocker from the outside in the vehicle width direction, and in this case, it is difficult to transmit the collision load in the axial direction of the rocker.

  Therefore, an object of the present invention is to obtain a vehicle body front part structure that can suppress the front wheels from hitting the rocker from the outside in the vehicle width direction when a collision load is input from the front side of the vehicle body.

In order to achieve the above object, the vehicle body front structure according to claim 1 of the present invention has one end portion supported by the suspension member and the other end portion supporting the front wheel so that the vehicle body collides from the front side of the vehicle body. A first lower arm configured so that the one end is detached from the suspension member when a load is input, and one end is connected to the suspension member, and the other end is connected to the first lower arm. It is connected, and a second lower arm you place in a state of being abutted against the vehicle body front side of the rocker by the front wheel was translated into the rear of the vehicle body outer side while supporting the withdrawal has been the first lower arm from said suspension member, It is characterized by having.

According to the first aspect of the present invention, when the collision load is input from the front side of the vehicle body, the first lower arm is detached from the suspension member. Then, the front wheel supported by the first lower arm is translated parallel to the vehicle body rear outside by the second lower arm, and is disposed in a state of being abutted against the vehicle body front side of the rocker.

Therefore, the front wheel is prevented or prevented from hitting the rocker from the outside in the vehicle width direction, and the collision load input from the front side of the vehicle body is transmitted to the rocker in the axial direction via the front wheel.

In the vehicle body front structure according to claim 2 of the present invention, when one end is supported by the suspension member and the other end supports the front wheel, when a collision load is input from the front side of the vehicle A first lower arm configured to be detached from the suspension member; and one end connected to the suspension member and the other end connected to the first lower arm from the suspension member. the front wheel withdrawal has been while supporting the first lower arm by translating the rear of the vehicle body outer side is characterized in Rukoto that Yusuke second lower arm to place in the vehicle width direction outer side of the rocker, the.

According to the second aspect of the present invention , the first lower arm is detached from the suspension member when a collision load is input from the front side of the vehicle body. Then, the front wheel supported by the first lower arm is translated parallel to the rear outer side of the vehicle body by the second lower arm, and is arranged on the outer side in the vehicle width direction of the rocker .

Therefore, the front wheel is prevented or prevented from hitting the rocker from the outside in the vehicle width direction, and the collision load input from the vehicle body front side is absorbed on the vehicle body front side than the rocker. Accordingly, it is Ru is suppressed or prevented that the collision load is transmitted to the rocker.

Note that “parallel” in the present invention includes not only exact parallelism but also approximate parallelism. In addition, the "vehicle rear outer" in the present invention, in the vehicle width direction outer side, and that means the rear side of the vehicle body.

The vehicle body front part structure according to claim 3 is the vehicle body front part structure according to claim 1 or claim 2, wherein the second lower arm is constituted by two rods arranged in parallel. It is characterized by that.

According to invention of Claim 3 , the 2nd lower arm is comprised by the two rods located in a line in parallel. That is, the second lower arm are that constitute a parallel link mechanism. Therefore, the mechanism for translating the front wheel supported by the first lower arm to the rear outer side of the vehicle body is simplified .

According to the first aspect of the present invention, when a collision load is input from the front side of the vehicle body, it is possible to suppress the front wheels from hitting the rocker from the outside in the vehicle width direction . the collision load, Ru can be transmitted to the rocker axially through the front wheels.

According to the invention of claim 2, when a collision load is input from the front side of the vehicle body, the front wheel can be prevented from hitting the rocker from the outside in the vehicle width direction and input from the front side of the vehicle body. The collision load can be absorbed on the front side of the vehicle body from the rocker .

Therefore, according to the invention according to claim 2, it is possible collision load inputted from the vehicle front side is inhibited or prevented from being transmitted to the rocker.

According to the invention which concerns on Claim 3 , the mechanism which translates the front wheel supported by the 1st lower arm to the vehicle body back outer side can be simplified .

It is a top view which shows the state of the front wheel which concerns on 1st Embodiment before a vehicle carries out a micro lap collision with a barrier. It is a principal part expansion perspective view which shows the attachment structure which concerns on 1st Embodiment of the 1st lower arm with respect to a suspension member. It is a top view which shows the behavior of the front wheel which concerns on 1st Embodiment after a vehicle carries out a micro lap collision with a barrier. It is a top view which shows the behavior of the front wheel which concerns on 2nd Embodiment after a vehicle carries out a micro lap collision with a barrier.

  Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings. For convenience of explanation, an arrow UP appropriately shown in each drawing is an upward direction of the vehicle body, an arrow FR is a forward direction of the vehicle body, and an arrow IN is an inner side of the vehicle width direction. In addition, in the following description, when the front-rear, up-down, left-right directions are indicated without special mention, the front-rear direction of the vehicle body, the up-down direction of the vehicle body, the left-right direction of the vehicle body (the vehicle width direction) To do.

<First Embodiment>
First, the first embodiment will be described. As shown in FIG. 1, a front side member 14 having a rectangular closed cross-sectional shape extending in the longitudinal direction of the vehicle body is provided at the front portion of the vehicle 12 on the right side and the left side of the vehicle (outward in the vehicle width direction). ) A pair is arranged at a predetermined interval. A front bumper reinforcement 16 having a rectangular closed cross section and extending in the vehicle width direction is installed between the front end portions of the pair of left and right front side members 14.

  A suspension member (subframe) 18 whose longitudinal direction is the vehicle width direction is disposed on the vehicle body rear side of the front bumper reinforcement 16. An end of the suspension member 18 in the vehicle width direction and an end on the front side of the vehicle body (hereinafter referred to as “attached portion 20”) is an inner side in the vehicle width direction of the first lower arm 30 constituting a strut suspension as an example. An end portion (hereinafter referred to as “attachment portion 32”) is attached.

  As shown in FIG. 2, the attachment portion 32 of the first lower arm 30 is formed in a cylindrical shape having a through hole 32 </ b> A in which the vehicle body longitudinal direction is the axial direction. In addition, a pair of projecting plates 22 projecting outward in the vehicle width direction are formed on the mounted portion 20 of the suspension member 18 with a predetermined gap in the vehicle longitudinal direction. A mounting portion 32 of the first lower arm 30 is arranged between the pair of protruding plates 22.

  Further, a substantially “U” -shaped cutout 24 is formed in the center of the front end of each protruding plate 22, with the outer side in the vehicle width direction opened. The opening width of the notch 24 in the vertical direction of the vehicle body is formed to be slightly larger than the diameter of a male screw portion of a flange bolt 56 described later. Therefore, the attachment portion 32 of the first lower arm 30 is attached to the attached portion 20 of the suspension member 18 as follows.

  That is, the attachment portion 32 of the first lower arm 30 is disposed between the pair of protruding plates 22 in the attachment portion 20 of the suspension member 18. At this time, the cutout portion 24 of each protruding plate 22 and the through hole 32A of the attachment portion 32 are communicated. Then, the male screw portion of the flange bolt 56 is inserted from the vehicle body front side (or vehicle body rear side) into the cutout portion 24 of the protruding plate 22, the through hole 32A of the mounting portion 32, and the cutout portion 24 of the protruding plate 22 in order. 58.

  As a result, the attachment portion 32 of the first lower arm 30 is attached so as to be detached from the attachment portion 20 when a force is applied to the attachment portion 20 of the suspension member 18 outward in the vehicle width direction. Further, as shown in FIG. 1, a front wheel 60 is supported by an outer end portion in the vehicle width direction of the first lower arm 30 (hereinafter referred to as “support portion 34”). 50 is arranged on the front side of the vehicle body.

  One rod as a second lower arm 40 that constitutes a strut suspension together with the first lower arm 30 at the vehicle width direction outer side of the suspension member 18 and at the rear side of the vehicle body (hereinafter referred to as “the pivoted support portion 26”). 42 end portions in the vehicle width direction (hereinafter referred to as “the pivot portion 46”) are pivotally connected.

  Similarly, the vehicle width of the other rod 44 serving as the second lower arm 40 is provided in the vicinity of the pivoted portion 26 and on the inner side in the vehicle width direction of the pivoted portion 26 (hereinafter referred to as “the pivoted portion 28”). A direction inner end (hereinafter referred to as “pivot 48”) is pivotally connected.

  Further, the outer ends in the vehicle width direction of the rods 42 and 44 (hereinafter referred to as “pivot support portions 52 and 54”) are respectively pivotally supported in the middle portions of the first lower arm 30 (hereinafter referred to as “pivot support portions 36 and 38”). It is connected. Specifically, the pivotal support portion 52 of the rod 42 is pivotally connected to the pivoted support portion 36 at a substantially central portion in the longitudinal direction of the first lower arm 30, and the pivotal support portion 54 of the rod 44 is connected to the mounting portion 32 of the first lower arm 30. It is pivotally connected to a pivoted portion 38 at a substantially intermediate portion between the pivoted portion 36 and the pivoted portion 36.

  That is, by this, the suspension member 18, the two rods 42 and 44 constituting the second lower arm 40, and the first lower arm 30 constitute a parallel link mechanism.

  Next, the operation of the vehicle body front structure 10 according to the first embodiment configured as described above will be described.

  That is, as shown in FIG. 1, an explanation will be given of the operation when a so-called minute lap collision occurs in which the outer end in the vehicle width direction of the front bumper reinforcement 16 on the outer side in the vehicle width direction collides with the barrier W from the front side member 14. To do.

  When the vehicle 12 collides with the barrier W with a minute lap, as shown in FIG. 3, the outer end portion in the vehicle width direction of the front bumper reinforcement 16 is deformed toward the rear side of the vehicle body, and then the front wheel 60 becomes the barrier W. There may be a collision. In this case, since the first lower arm 30 is applied with a force toward the outside in the vehicle width direction, the mounting portion 32 is detached from the mounted portion 20 of the suspension member 18.

  The first lower arm 30 from which the mounting portion 32 is detached from the mounted portion 20 is supported by the two rods 42 and 44 constituting the second lower arm 40 and is located on the rear side outside the vehicle body, that is, on the vehicle width direction outside, and the vehicle body rear side. Translated sideways. In other words, the front wheel 60 supported by the first lower arm 30 has a parallel link mechanism constituted by the suspension member 18, the two rods 42 and 44 (second lower arm 40), and the first lower arm 30. It is translated in the width direction outside and to the vehicle body rear side.

  The front wheel 60 that has been translated parallel to the vehicle width direction outside and the vehicle body rear side is disposed along the vehicle body front-rear direction in a state of being abutted against the vehicle body front side of the rocker 50. That is, the front wheel 60 is disposed so as to be sandwiched between the barrier W and the rocker 50 as shown in FIG. Therefore, the front wheel 60 is suppressed or prevented from hitting the rocker 50 from the outside in the vehicle width direction.

  A part of the collision load input when the vehicle 12 collides with the barrier W in a minute lap is transmitted in the axial direction of the rocker 50 via the front wheel 60 (specifically, the wheel of the front wheel 60: not shown). . Here, the rocker 50 is a vehicle body skeleton member in the vehicle 12, and has high strength and rigidity against a collision load input from the vehicle longitudinal direction (axial direction).

  Therefore, even if a collision load is transmitted in the axial direction of the rocker 50 through the front wheel 60 during a minute lap collision, a strong axial reaction force against the collision load is obtained, and deformation of the rocker 50 is suppressed or prevented. Therefore, the deformation of the passenger compartment is suppressed or prevented at the time of the minute lap collision of the vehicle 12.

Second Embodiment
Next, a second embodiment will be described. In addition, the same code | symbol is attached | subjected to the site | part equivalent to 1st Embodiment, and detailed description is abbreviate | omitted.

  As shown in FIG. 4, in the vehicle body front structure 10 according to the second embodiment, the front wheel 60 supported by the first lower arm 30 separated from the suspension member 18 is moved parallel to the rear rear side of the vehicle body. The rocker 50 is arranged on the outer side in the vehicle width direction. Specifically, in the vehicle body front structure 10 according to the second embodiment, as an example, the length of the suspension member 18 in the vehicle longitudinal direction at the vehicle width direction outer side portion and the length of the second lower arm 40 (rods 42 and 44). Is longer than the case of the first embodiment.

  In the vehicle body front structure 10 according to the second embodiment shown in FIG. 4, the length and shape of the first lower arm 30, the pivotal support portions 46, 48, 52, 54 (respective pivotal support portions 26, 28, 36, The position 38) is the same as in the first embodiment. However, the length and shape of the first lower arm 30, the positions of the pivotal support portions 46, 48, 52, 54 (respective pivotal support portions 26, 28, 36, 38) are different from those in the first embodiment, The front wheel 60 may be arranged outside the rocker 50 in the vehicle width direction.

  Next, the operation of the vehicle body front structure 10 according to the second embodiment configured as described above will be described.

  When the vehicle 12 collides with the barrier W in a minute lap, as shown in FIG. 4, the outer end in the vehicle width direction of the front bumper reinforcement 16 is deformed toward the rear side of the vehicle body, and then the front wheel 60 becomes the barrier W. There may be a collision. In this case, since the first lower arm 30 is applied with a force toward the outside in the vehicle width direction, the mounting portion 32 is detached from the mounted portion 20 of the suspension member 18.

  The first lower arm 30 from which the mounting portion 32 is detached from the mounted portion 20 is supported by the two rods 42 and 44 constituting the second lower arm 40 and is located on the rear side outside the vehicle body, that is, on the vehicle width direction outside, and the vehicle body rear side. Translated sideways. In other words, the front wheel 60 supported by the first lower arm 30 has a parallel link mechanism constituted by the suspension member 18, the two rods 42 and 44 (second lower arm 40), and the first lower arm 30. It is translated in the width direction outside and to the vehicle body rear side.

  Then, the front wheels 60 that are translated in the vehicle width direction outside and to the vehicle body rear side are arranged on the vehicle width direction outside of the rocker 50 along the vehicle body front-rear direction. That is, as shown in FIG. 4, the front wheel 60 does not hit the rocker 50 (it is prevented or prevented from hitting the rocker 50 from the outside in the vehicle width direction). Therefore, deformation of the rocker 50 is suppressed or prevented.

  The collision load input when the vehicle 12 collides with the barrier W in a minute lap is absorbed by a part of the vehicle body front side that is disposed on the vehicle front side of the rocker 50. That is, since the front wheel 60 is disposed on the outer side in the vehicle width direction of the rocker 50, the front wheel 60 does not prevent the crash stroke on the vehicle body front side. Therefore, the deformation of the passenger compartment is suppressed or prevented at the time of the minute lap collision of the vehicle 12.

  The vehicle body front structure 10 according to the present embodiment has been described with reference to the drawings. However, the vehicle body front structure 10 according to the present embodiment is not limited to the illustrated one, and the gist of the present invention is described. The design can be changed as appropriate without departing from the scope. For example, the mechanism for moving the front wheel 60 parallel to the vehicle width direction outside and the vehicle body rear side is not limited to the parallel link mechanism including the two rods 42 and 44 (second lower arm 40) arranged in parallel. Absent.

  Further, the configuration of the attached portion 20 in the suspension member 18 is not limited to the configuration in which the cutout portion 24 is formed at the center of the front end portion of the protruding plate 22. For example, when a weak portion having a thin plate thickness is formed at the center of the front end portion of the protruding plate 22 and a force is applied to the first lower arm 30 outward in the vehicle width direction, the weak portion is broken, A configuration may be adopted in which the attachment portion 32 of the first lower arm 30 is detached from the attached portion 20.

  Further, a notch portion or a fragile portion (both not shown) may be formed in the attachment portion 32 of the first lower arm 30 so that the attachment portion 32 is detached from the attached portion 20. In addition, as described above, the vehicle body front structure 10 according to the present embodiment is a structure that is effective against micro-lap collision, but it is needless to say that the structure is also effective against offset collision.

DESCRIPTION OF SYMBOLS 10 Car body front part structure 18 Suspension member 30 1st lower arm 32 Attachment part (one end part)
34 Supporting part (other end part)
40 Second lower arm 42 Rod 44 Rod 46 Pivot (one end)
48 Pivot (one end)
50 Rocker 52 Pivot (other end)
54 Pivot (other end)
60 front wheels

Claims (3)

The first end is supported by the suspension member, the other end supports the front wheel, and the first end is separated from the suspension member when a collision load is input from the front side of the vehicle body. 1 lower arm,
One end portion is connected to the suspension member is connected to the other end of the first lower arm, the front wheel while supporting the first lower arm that is separated from the suspension member by translating the rear of the vehicle body outer side a second lower arm you place in a state of being abutted against the vehicle body front side of the rocker,
The vehicle body front part structure characterized by having. The first end is supported by the suspension member, the other end supports the front wheel, and the first end is separated from the suspension member when a collision load is input from the front side of the vehicle body. 1 lower arm,
One end is connected to the suspension member, the other end is connected to the first lower arm, and the front wheel is moved parallel to the rear rear side while supporting the first lower arm detached from the suspension member. A second lower arm disposed outside the rocker in the vehicle width direction;
Vehicle body front structure characterized Rukoto to have a. Said second lower arm, the vehicle body front structure according to claim 1 or claim 2, characterized that you have been composed of two rods which are arranged in parallel.

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