JP2016043853A - Vehicle front part structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make compatible both the maintenance of fastening with a suspension member of a suspension arm at pothole traveling and the release of the fastening with the suspension member of the suspension arm at a fine lap collision.SOLUTION: A front-side lower fastening part 52 which is arranged at an end part of a front-side lower arm 50 extending to an inside oblique front side in a vehicle width direction is bolt-fastened into a front-side lower bracket 22 of a suspension member 20. A salient part 66 which is formed at an outer cylinder 62 constituting a bush 60 of the front-side lower fastening part 52 of the front-side lower arm 50 moves to a non-lap position which is not overlapped from a lap position in a position which is overlapped on a vertical wall part 26 of the front-side lower bracket 22 accompanied by the rotation of the front-side lower arm 50 (front-side lower fastening part 52) by the movement of front wheels 14 to lower positions.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vehicle front structure.

  A structure is known in which a suspension arm (lower arm) constituting a suspension device is fastened to a bracket provided on a suspension member via a bush (see, for example, Patent Document 1 and Patent Document 2).

  Here, a large load may be applied to the front wheel on the vehicle rear side in a state where the front wheel enters the hole (pot hole) and moves downward. Thus, even when a large load is applied to the front wheels during the pothole traveling, the suspension arm is configured to maintain the fastening with the suspension member.

  However, at the time of a minute lap collision in which a front collision occurs on the outer side in the vehicle width direction than the front side member, the fastening of the suspension arm with the suspension member may be released in order to suppress the movement of the front wheels in the vehicle width direction. It may be desirable.

  Therefore, there was room for improvement in this respect.

JP 2008-007063 A JP2013-49321A

  In view of the above facts, the present invention aims to achieve both the maintenance of fastening with the suspension member of the suspension arm during pothole travel and the release of fastening with the suspension member of the suspension arm during a minute lap collision. .

  The vehicle front structure according to claim 1 is disposed on the inner side in the vehicle width direction of the front suspension device that supports the front wheels, and constitutes the front suspension device with a bracket provided on a suspension member that supports the front suspension device. A suspension arm extending obliquely forward inward in the vehicle width direction; a fastening portion provided at a front end portion of the suspension arm, the suspension arm being fastened in the bracket so as to be rotatable in the vertical direction; It is formed in a convex shape from the fastening portion toward the vertical wall portion on the vehicle rear side of the bracket, and is viewed in the direction of the rotation axis as the suspension arm rotates due to the front wheel moving to a position below the traveling road surface. A protrusion that moves from a lapping position that overlaps the vertical wall to a non-lapping position that does not overlap It is equipped with a.

  According to the first aspect of the present invention, the fastening portion provided at the end of the suspension arm extending obliquely forward inward in the vehicle width direction is fastened in the bracket of the suspension member. The projecting part provided in the fastening part of the suspension arm is seen in the direction of the rotation axis as the suspension arm rotates as the front wheel enters the hole (pot hole) and moves to a position below the traveling road surface. The vehicle moves from a lap position that overlaps the vertical wall portion on the vehicle rear side to a non-lap position that does not overlap.

  Here, at the time of a minute lap collision that collides frontward on the vehicle width direction outside of the front side member, the protruding portion at the lap position of the fastening portion at the front side end portion of the suspension arm due to the collision load input to the front wheel, The shared load (tensile load) of the suspension arm increases by contacting the vertical wall portion of the bracket on the vehicle rear side. As the shared load (tensile load) increases, a part of the suspension arm is broken and the fastening with the suspension member is released.

  On the other hand, when the front wheel enters the hole (pot hole) and moves to a position below the traveling road surface, the suspension arm rotates. As the suspension arm rotates, the protrusion of the fastening portion rotates from the lap position to the non-lap position. Therefore, even when a load is applied to the front wheel on the front wheel during pothole travel, the protruding portion of the fastening portion at the front end of the suspension arm is in the non-wrap position, and the protruding portion is the vertical wall portion on the vehicle rear side of the bracket. Do not touch. Therefore, since the shared load (tensile load) of the suspension arm does not increase, the fastening with the suspension member is maintained.

  Therefore, both the maintenance of fastening with the suspension member of the suspension arm during pothole traveling and the release of fastening with the suspension member of the suspension arm at the time of a minute lap collision are compatible.

  According to the first aspect of the present invention, it is possible to achieve both the maintenance of fastening with the suspension member of the suspension arm during pothole traveling and the release of fastening with the suspension member of the suspension arm during a minute lap collision.

It is a bottom view of the vehicle front part structure concerning one embodiment of the present invention. It is a perspective view of the fastening part of the front lower arm and suspension member of the vehicle front part structure concerning one Embodiment of this invention. (A) is an enlarged plan view of a fastening portion between a front lower arm and a suspension member of a vehicle front structure according to an embodiment of the present invention, and (B) is a perspective view of a front lower fastening portion of the front lower arm. (A) is a perspective view of a fastening portion between the front lower arm and the suspension member in a state where the protruding portion is at the lap position, and (B) is a diagram for explaining an increase in the shared load of the front lower arm at the time of a minute lap collision 1 is a bottom view corresponding to FIG. (A) is a perspective view of a fastening portion between the front lower arm and the suspension member in a state where the protruding portion is in a non-lap position, and (B) is for explaining an increase in the shared load of the front lower arm during pothole traveling It is a bottom view corresponding to FIG.

  A vehicle front structure according to an embodiment of the present invention will be described with reference to FIGS. In these drawings, an arrow FR appropriately shown indicates the front side in the vehicle front-rear direction, an arrow UP indicates the vehicle vertical direction upper side, and an arrow OUT indicates the vehicle width direction outer side. Moreover, in each figure, although only one side of the vehicle width direction is shown, it is the same structure except that the opposite side is also symmetrical.

<Structure>
As shown in FIG. 1, suspension members (subframes) 20 are disposed below a pair of front side members 12 that extend in the vehicle front-rear direction provided on both sides of the vehicle body front portion 10 in the vehicle width direction. Yes. FIG. 1 is a bottom view as seen from the lower side to the upper side in the vehicle vertical direction.

  The suspension member (subframe) 20 has a frame shape (cross-girder type) when viewed from below, and a front slat type multi-link suspension device 30 that supports the front wheels 14 is provided outside the suspension member 20 in the vehicle width direction. Yes.

  The multi-link suspension device 30 includes a suspension body 32, a front lower arm 50 and a rear lower arm 40 that extend from the suspension body 32 and are fastened to the suspension member 20, and a front upper arm 42 and a rear upper arm 44. Yes.

  The front lower arm 50 extends from the main body side fastening portion 34 bolted to the suspension main body 32 to the front side in the vehicle width direction, and a front lower fastening portion 52 is provided at the tip. The front lower fastening portion 52 is bolted to the front lower bracket 22 formed on the suspension member 20.

  As shown in FIGS. 1 to 3, the front lower fastening portion 52 of the front lower arm 50 has a structure in which a bush 60 is press-fitted into a ring-shaped cylindrical portion 54. The bush 60 has an outer cylinder 62 and a bush tube 64 provided in the outer cylinder 62. As shown in FIG. 3B, a through hole 64A through which a bolt to be fastened is formed is formed at the center of the bush tube 64. Further, the through hole 64A has an axis G (see FIGS. 1 and 3A) as a direction in which the front side of the vehicle is inclined outward in the vehicle width direction with respect to the vehicle longitudinal direction. In addition, the protrusion part 66 currently formed in the bush 60 is mentioned later.

  As shown in FIGS. 1, 2, and 3A, the front lower bracket 22 formed on the suspension member 20 is in the direction of the axis G of the front lower fastening portion 52 of the front lower arm 50 (FIGS. 1 and 3 (A))) has a pair of vertical wall portions 24, 26 facing each other. A front lower fastening portion 52 of the front lower arm 50 is disposed between the vertical wall portion 24 and the vertical wall portion 26 of the front lower bracket 22 and is bolted.

  As shown in FIG. 1, the rear lower arm 40 extends inwardly in the vehicle width direction from a main body side fastening portion 36 with the suspension main body 32, and a rear lower fastening portion 46 is provided at a tip portion. The rear lower fastening portion 46 is bolted to the rear lower bracket 28 formed on the suspension member 20 in the same manner as the front lower fastening portion 52 of the front lower arm 50 described above. The rear lower fastening portion 46 and the rear lower bracket 28 have substantially the same structure as the front lower fastening portion 52 and the front lower bracket 22 of the front lower arm 50 except for the protrusion 66 described later.

  As shown in FIGS. 1 to 3, the outer cylinder 62 constituting the bush 60 of the front lower fastening portion 52 of the front lower arm 50 is convex toward the vertical wall portion 26 on the vehicle rear side of the front lower bracket 22. The protrusion 66 is formed.

  In addition, as shown in FIG. 2, the lower portion of the vehicle rear side of the longitudinal wall portion 26 on the vehicle rear side of the front lower bracket 22 is notched obliquely on the vehicle rear side. In addition, the part which the imaginary line (two-dot broken line) in FIG. 2 was notched is shown, and this notch part is made into the notch part 26A.

  As shown in FIGS. 2 and 4A, when the front wheel 14 (see FIG. 1) in a normal running and stopped state is in the standard range, the bush 60 of the front lower fastening portion 52 of the front lower arm 50 is configured. The protrusion 66 formed on the outer cylinder 62 is at least partially overlapped with the vertical wall 26 of the front lower bracket 22 when viewed from the direction of the axis G.

  However, as shown in FIG. 5A, when the front wheel 14 is inserted into a hole (pot hole) and moved downward from the traveling road surface, the front lower arm 50 (front lower fastening portion 52) is The angle changes by rotating around the shaft center G (bolt fastening portion). As a result, the bush 60 of the front lower fastening portion 52 rotates, and the protrusion 66 does not overlap the vertical wall portion 26 of the front lower bracket 22 when viewed from the axial center G direction (notch portion 26A ( (See FIG. 2)).

  2 and 4A, the position where the protrusion 66 of the front lower fastening portion 52 of the front lower arm 50 overlaps with the vertical wall portion 26 of the front lower bracket 22 is defined as a lap position. A position where the protruding portion 66 does not overlap the vertical wall portion 26 is defined as a non-wrapping position.

<Action and effect>
Next, the operation and effect of this embodiment will be described.

  A front lower fastening portion 52 provided at an end portion of the front lower arm 50 extending obliquely forward inward in the vehicle width direction is bolted to the front lower bracket 22 of the suspension member 20. The protrusion 66 formed on the outer cylinder 62 constituting the bush 60 of the front lower fastening portion 52 of the front lower arm 50 rotates the front lower arm 50 (front lower fastening portion 52) when the front wheel 14 moves downward. Accordingly, the lap position that overlaps the vertical wall portion 26 of the front lower bracket 22 shown in FIGS. 2 and 4A moves to the non-wrap position that does not overlap the vertical wall portion 26 shown in FIG. 5B.

(Small lap collision)
At the time of a minute lap collision in which a front collision occurs on the outer side in the vehicle width direction from the front side member 12, the protrusion 66 of the front lower fastening portion 52 of the front lower arm 50 is at the lap position as shown in FIG. The protrusion 66 comes into contact with the vertical wall 26 on the vehicle rear side of the front lower bracket 22 by the collision load F <b> 1 input to the front wheel 14.

  As a result, the shared load (tensile load S1) of the front lower arm 50 shown in FIG. 4B increases. Further, since the shared load (tensile load S1) of the front lower arm 50 is increased, the main body side fastening portion 34 with the suspension main body 32 on the vehicle rear side of the front lower arm 50 is broken, and the suspension member of the front lower arm 50 is substantially obtained. The fastening with 20 is released.

  Thus, buckling due to an increase in the compression force L1 acting on the rear lower arm 40 is avoided by releasing the fastening of the front lower arm 50 to the suspension member 20 at an early stage during the minute lap collision. As a result, the front wheel 14 is prevented from entering the vehicle width direction inside, and the front wheel 14 is prevented from entering a cabin (vehicle compartment) (not shown).

  Note that before the rear lower arm 40 buckles due to an increase in the compressive force L1, an increase in the shared load (tensile load S1) of the front lower arm 50 in a minute lap collision causes the suspension body 32 on the vehicle rear side of the front lower arm 50 to be in contact with the suspension body 32. The main body side fastening portion 34 is designed to be broken.

(Pothole running)
When traveling on a road surface or the like having a hole (pot hole) formed due to a cracked crack or a defective drainage, that is, when traveling in a pot hole, the front wheel 14 enters the hole (pot hole) and the front wheel 14 is more than the traveling road surface. When moved to the lower position, as shown in FIG. 5A, the front lower arm 50 (front lower fastening portion 52) rotates around the axis G (bolt fastening portion) and changes its angle. As a result, the bush 60 of the front lower fastening portion 52 rotates and the protruding portion 66 moves to a non-wrapping position (notch portion 26A (see FIG. 2)) that does not overlap the vertical wall portion 26 of the front lower bracket 22. .

  Therefore, when the front wheel 14 in the pothole traveling is in the lower position, even if the load F2 is applied to the front wheel 14 on the vehicle rear side, the protrusion 66 of the front lower fastening portion 52 of the front lower arm 50 is in the non-lap position. There is no contact with the vertical wall portion 26 of the front lower bracket 22 on the vehicle rear side. Therefore, since the shared load (tensile load S2) of the front lower arm 50 does not increase, the fastening with the suspension member 20 is maintained.

(Summary)
Thus, both the fastening maintenance with the suspension member 20 of the front lower arm 50 during pothole traveling and the release of the fastening with the suspension member 20 of the front lower arm 50 during a minute lap collision are compatible.

<Others>
The present invention is not limited to the above embodiment.

  For example, in the above-described embodiment, the protruding portion 66 is formed on the outer cylinder 62 that constitutes the bush 60 of the front lower fastening portion 52 of the front lower arm 50, but is not limited thereto. A projecting portion may be formed on the annular portion constituting the front lower fastening portion 52 of the front lower arm 50.

  Further, for example, the vehicle front structure according to the present embodiment has been described as being configured symmetrically, but may not be configured symmetrically. That is, although the present invention is applied to both the left and right front lower arms 50, the present invention may be applied to only one of the left and right front lower arms 50.

  Furthermore, it cannot be overemphasized that it can implement with a various aspect in the range which does not deviate from the summary of this invention.

14 Front wheel 20 Suspension member 22 Front lower bracket (bracket)
30 Multilink suspension device (front suspension device)
50 Front lower arm (suspension arm)
52 Front lower fastening part (fastening part)
66 Protrusion G Center axis (Rotating shaft)

Claims (1)

A bracket disposed on the vehicle width direction inner side of the front suspension device that supports the front wheels, and provided on a suspension member that supports the front suspension device;
A suspension arm that constitutes the front suspension device and extends diagonally forward inward in the vehicle width direction;
A fastening portion provided at a front side end portion of the suspension arm, the suspension arm being inserted and fastened into the bracket so as to be rotatable in a vertical direction;
It is formed in a convex shape from the fastening portion toward the vertical wall portion on the vehicle rear side of the bracket, and in the direction of the rotation axis along with the rotation of the suspension arm due to the front wheel moving to a position below the traveling road surface. A protrusion that moves from a lap position that overlaps the vertical wall portion as seen to move to a non-lap position that does not overlap;
A vehicle front structure comprising:

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