JP4923026B2 - Suspension arm support structure - Google Patents

Description

  The present invention relates to a suspension arm support structure, and more particularly to a support structure for an automobile rear suspension.

  As a rear-wheel suspension device for a front-wheel drive vehicle, for example, an H-type torsion beam suspension is known in which intermediate portions of left and right trailing arms are connected by a torsion beam. In a vehicle equipped with an H-type torsion beam type suspension, the front ends of left and right suspension arms (trailing arms) are normally swingably supported on a body frame (rear frame or the like) of the body.

The suspension arm support structure uses a support bracket including a pair of support walls arranged at a predetermined interval, and the front ends of the left and right suspension arms are pivotally supported between the pair of support walls via a support shaft. There is something like that. In order to improve the rigidity of the suspension arm support structure, one support wall is joined to the cross member, and one end of the support shaft is fixed by a support member joined in the cross member. (For example, patent document 1).
JP 2006-168607 A

  However, depending on the vehicle body layout, the support bracket may be disposed away from the cross member. In this case, there is a problem that the support wall and the cross member cannot be joined. Moreover, the structure which provides a support member in a cross member, and joins a support member and a support shaft is complicated, and there exists a problem that manufacturing cost becomes high.

  The present invention has been made in view of the above problems, and provides a suspension arm support structure having high structural strength and applicable to various vehicle body layouts.

  In order to solve the above-mentioned problems, a first aspect of the present invention includes an inner support wall (21) joined to a vehicle body frame (rear frame 2), and a vehicle width relative to the inner support wall on the vehicle body frame. One end is disposed between the outer support wall (22) joined to the outer side in the direction at a predetermined interval, and between the inner support wall and the outer support wall, and penetrates the inner support wall and the outer support wall. The suspension arm (trailing arm 10) supported by the supporting bolt (pivot bolt 24) to be swingable is disposed on the inner side of the inner support wall in the vehicle width direction, and one end (upper end portion 23a) is provided on the vehicle body frame. The stiffener (23) having the other end (lower end portion 23b) joined to the inner support wall and the stiffener and the inner support wall are disposed between the stiffener and the inner support wall. Held in Na, characterized in that the threaded portion of the support bolt and a nut (25) to be screwed.

  According to this configuration, since the closed cross-sectional structure is formed by the stiffener, the vehicle body frame, and the inner support wall, the structural strength of the suspension arm support structure is improved. Further, since the inner support wall, the outer support wall, and the stiffener are joined to the rear frame, the inner support wall, the outer support wall, and the stiffener can be arranged at any positions without being influenced by the layout of the middle cross member and the like. Furthermore, since the nut can be made into one part in a state where it is fixed to the stiffener in advance, it is easy to join the stiffener to the rear frame and the inner support wall, and the assembling workability is improved. Further, the manufacturing cost can be reduced.

  In a second aspect based on the first aspect, the inner support wall is joined to a lower portion (bottom portion 2c) of the vehicle body frame, and the stiffener has one end at a side portion (inner side in the vehicle width direction of the vehicle body frame). It is characterized by being joined to the wall 2d).

  According to this configuration, since the upper end of the inner support wall and the upper end of the stiffener are separated from each other, the area of the closed cross-sectional structure formed by the stiffener, the vehicle body frame, and the inner support wall is enlarged, and the suspension arm is supported. The structural strength of the structure is improved.

  According to a third aspect of the present invention, in any one of the first to second aspects, the stiffener bulges toward the side where the periphery of the portion where the nut is fixed approaches or separates from the inner support wall. It is characterized by.

  According to this configuration, the stiffness of the stiffener is improved, and the structural strength of the suspension arm support structure is improved.

  According to a fourth invention, in any one of the first to third inventions, the outer support wall is joined to a member (side sill 4) constituting a vehicle body side wall.

  According to this configuration, the structural strength of the outer support wall is reinforced by the members constituting the vehicle body side wall, and the structural strength of the suspension arm support structure is improved.

  According to a fifth invention, in any one of the first to third inventions, the other end of the nut is in contact with the inner support wall.

  According to this configuration, the structural strength of the closed cross-sectional structure formed by the stiffener, the vehicle body frame, and the inner support wall is improved, and the structural strength of the suspension arm support structure is improved.

  With the above configuration, the structural strength of the suspension arm support structure can be improved by the stiffener. The stiffener can be arranged at an arbitrary position regardless of the layout of the cross member or the like, so that the degree of freedom of the vehicle body layout is expanded.

  Hereinafter, an embodiment in which the present invention is applied to an automobile equipped with an H-type torsion beam suspension will be described in detail with reference to the drawings. 1 is a side view showing a rear portion of an automobile according to the embodiment, FIG. 2 is a view taken along the arrow II in FIG. 1, FIG. 3 is a view taken along the arrow III in FIG. 2, and FIG. It is IV-IV sectional drawing of. In the following description, the vehicle traveling direction is defined as the forward direction, and the left-right direction is defined with reference to the state of facing the traveling direction.

  As shown in FIGS. 1 to 3, an automobile 1 according to the present embodiment has a rear frame 2, 3, side sills 4, 5, a middle cross member 6, a rear floor panel 8, an H-type torsion beam type as a vehicle body structural material at the rear lower part thereof. A suspension 9 is provided.

  The rear frames 2 and 3 are extended so as to go inward in the vehicle width direction as they proceed rearward. Further, the rear frames 2 and 3 include horizontal portions 2a and 3a whose bottom surfaces are horizontal, and an inclined kick-up portion 2b which is inclined upward toward the rear behind the horizontal portions 2a and 3a. The front end of the rear frame 2 is joined to a middle cross member 6 extending in the vehicle width direction. The left and right ends of the middle cross member 6 are joined to the inner side walls 4a of the side sills 4 and 5 that extend in the front-rear direction and form the side portions of the vehicle body. The rear floor panel 8 is supported by the rear frames 2 and 3 and the middle cross member 6, and both side portions thereof are joined to the side sills 4 and 5. Each member is joined by welding (spot welding or the like).

  The suspension 9 includes left and right trailing arms 10 and 11, a torsion beam 12 that connects intermediate portions of the trailing arms 10 and 11, and left and right suspension support portions 13 that swingably support the trailing arms 10 and 11. 14, a pair of left and right coil springs 15 as suspension springs, a pair of left and right dampers 16 and the like, and supports the left and right wheels 17 and 18.

  Hereinafter, the configuration of the suspension support portions 13 and 14 will be described with reference to FIGS. Since the suspension support portions 13 and 14 have a symmetrical structure, only the suspension support portion 13 on the left side of the vehicle body will be described. The suspension support portion 13 includes an inner support wall 21, an outer support wall 22, a stiffener 23, a pivot bolt (support bolt) 24, and a nut 25 as main components. The inner support wall 21, the outer support wall 22, and the stiffener 23 are press-formed products made of steel plates.

  The inner support wall 21 includes a flange portion 21a formed by bending an upper end portion thereof toward the outer support wall 22 and a bolt hole 21b into which the pivot bolt 24 is inserted. As shown in FIG. 4, the rear frame 2 includes a bottom portion 2c, an inner wall 2d erected on the inner side in the vehicle width direction of the bottom portion 2c, and an outer wall 2e erected on the outer side in the vehicle width direction of the bottom portion 2c. It has a U-shaped cross-sectional shape, and has a flange 2f welded to the lower surface of the rear floor panel 8 at the upper ends of the inner wall 2d and the outer wall 2e. The inner support wall 21 is disposed substantially parallel to the longitudinal direction of the rear frame 2, and the flange portion 21 a is welded to the bottom portion 2 c of the kick-up portion 2 b of the rear frame 2, thereby standing up with respect to the rear frame 2. It is installed. At this time, the position is adjusted so that the flange portion 21 a of the inner support wall 21 is disposed at the intermediate portion in the width direction of the bottom portion 2 c of the rear frame 2. Further, as shown in FIGS. 2 and 3, the inner support wall 21 has a front end portion 21 c welded to the inner wall 4 a of the side sill 4.

  As shown in FIG. 4, the outer support wall 22 is bent so that its upper end portion 22a is welded to the outer wall 2e of the rear frame 2 and its lower end portion 22b is located on the outer side in the vehicle width direction with respect to the upper end portion 22a. Is formed. A lower end portion 22 b of the outer support wall 22 is welded to the inner wall 4 a of the side sill 4, and a closed cross-sectional structure is formed by the outer support wall 22, the side sill 4, the rear floor panel 8, and the rear frame 2. Bolt holes 22 c are formed in the outer support wall 22 at positions facing the bolt holes 21 b of the inner support wall 21. Bolt holes 4 b are formed in the side sill 4 at positions corresponding to the bolt holes 22 c of the outer support wall 22. As shown in FIG. 2, the front portion of the outer support wall 22 is bent inward in the vehicle width direction, and the front end portion 22 d is welded to the side portion of the inner support wall 21.

  2 to 4, the stiffener 23 has its upper end 23a welded to the vicinity of the lower end of the inner wall 2d of the rear frame 2, and its lower end 23b welded to the lower end 21d of the inner support wall 21. Yes. Thus, a closed cross-sectional structure is formed by the rear frame 2, the inner support wall 21, and the stiffener 23. The stiffener 23 has a bolt hole 23c formed at a position facing the bolt hole 21b of the inner support wall 21, and a nut 25 is welded to the inner support wall 21 side of the bolt hole 23c. The nut 25 is a plate nut having a flange portion 25 a at one end, and is welded to the stiffener 23 at the other end.

  The stiffener 23 includes a bulging portion 23d in which the periphery of the bolt hole 23c bulges in a direction different from the nut 25 side. Thereby, in a state where the stiffener 23 is welded to the rear frame 2 and the inner support wall 21, the flange portion 25 a of the nut 25 comes into contact with the inner support wall 21. At this time, the nut 25 and the bolt hole 21b of the inner support wall 21 coincide with each other.

  The stiffener 23 includes a bead 23e extending radially from the bolt hole 23c, a bead 23f extending downward from the upper end 23a, and the like.

  A cylindrical portion 10a is formed at the front end of the trailing arm 10, and a bush 30 is attached to the cylindrical portion 10a. The bush 30 includes an outer collar 31 that is press-fitted into the cylindrical portion 10 a and an inner collar 33 that is coaxially connected to the inside of the outer collar 31 via a bush rubber 32. The length of the inner collar 33 is adjusted to be equal to the distance between the bolt hole 21 b of the inner support wall 21 and the bolt hole 22 c of the outer support wall 22.

  As shown in FIG. 4, the pivot bolt 24 penetrates the washer 35, the bolt hole 4 b of the side sill 4, the bolt hole 22 c of the outer support wall 22, the inner collar 33, and the bolt hole 21 b of the inner support wall 21 from the side sill 4 side. And screwed into the nut 25. As a result, the trailing arm 10 is pivotally supported by the pivot bolt 24 via the bush 30.

  The side sill 4 and the outer support wall 22 are fastened by screwing the pivot bolt 24 and the nut 25, the inner support wall 21 and the nut 25 are fastened, and the inner support wall 21, the stiffener 23, the rear frame 2, and the like. The structural strength of the closed cross-sectional structure formed by is improved.

  Next, the function and effect of the embodiment configured as described above will be described. Since the inner support wall 21 in the present embodiment is joined to the rear frame 2 and the stiffener 23 to form a closed cross-sectional structure, the structural strength is improved. Similarly, since the outer support wall 22 is joined to the rear frame 2, the rear floor panel 8, and the side sill 4 to form a closed cross-sectional structure, the structural strength is improved.

  The joint portion between the inner support wall 21 and the rear frame 2 is disposed at the intermediate portion in the width direction of the bottom portion 2c of the rear frame 2, and is separated from the joint portion between the stiffener 23 and the rear frame 2, thereby providing an inner support wall. The closed cross-sectional structure formed by 21, the rear frame 2 and the stiffener 23 becomes wider in the width direction of the rear frame 2 to increase the area and improve the structural strength. In the present embodiment, the closed cross-sectional structure formed by the inner support wall 21, the rear frame 2, and the stiffener 23 has a substantially triangular cross section.

  Since the stiffener 23 includes a bulging portion 23d and beads 23e and 23f and is three-dimensionally formed, strength and rigidity are improved. By using the nut 25 having the flange portion 25a as the nut 25 coupled to the tip of the pivot bolt 24, the contact area between the inner support wall 21 and the nut 25 is expanded, and the structural strength is improved.

  Since the nut 25 can be made as one part in a state where it is fixed to the stiffener 23 in advance, it is easy to join the stiffener 23 to the rear frame 2 and the inner support wall 21 and the assembling workability is improved. Further, when the trailing arm 10 is fixed to the suspension support portion 13, there is no need to fix the nut 25, so that the workability of attaching the pivot bolt 24 is improved.

  Although the description of the specific embodiment is finished as described above, the present invention is not limited to the above embodiment and can be widely modified. For example, the inner support wall 21 and the outer support wall 22 may be provided with beads to improve the structural strength of each member. The configuration of other devices can be appropriately changed without departing from the spirit of the invention.

It is a side view which shows the rear part of the motor vehicle which concerns on embodiment. It is an II arrow directional view in FIG. FIG. 3 is a view taken in the direction of arrow III in FIG. 2. It is IV-IV sectional drawing of FIG.

Explanation of symbols

  1: Automobile, 2, 3: Rear frame, 4, 5: Side sill, 6: Middle cross member, 8: Rear floor panel, 9: H-type torsion beam suspension, 10, 11: Trailing arm, 13, 14: Suspension support Part, 21: inner support wall, 22: outer support wall, 23: stiffener, 23a: upper end part, 23b: lower end part, 23d: bulging part, 23e, 23f: bead, 24: pivot bolt, 25: nut, 30 :bush

Claims (5)

An inner support wall that is joined to the body frame at the upper end and is erected on the body frame ;
An outer support wall joined to the vehicle body frame at an upper end with a predetermined interval on the outer side in the vehicle width direction with respect to the inner support wall;
One end is disposed between the inner support wall and the outer support wall, and the suspension arm is swingably supported by a support bolt that penetrates the inner support wall and the outer support wall;
Wherein disposed in the vehicle width direction inner side of the inner support wall, along with the upper end portion is joined to the body frame, the lower end is joined to the lower end of the inner support wall, a substantially triangular with the body frame and the inner support wall A stiffener forming a closed cross-sectional structure of
A plate nut welded to a portion of the stiffener facing the inner support wall at the other end provided with a flange portion ;
With
The stiffener bulges to the side where the periphery of the portion where the plate nut is welded is separated from the inner support wall,
The support bolt passes through the inner support wall and is screwed to the plate nut, whereby the plate nut abuts on the inner support wall at the flange portion, and the plate nut and the inner support wall are fastened. Suspension arm support structure characterized by being made . The inner support wall is joined to a lower portion of the body frame,
The suspension arm support structure according to claim 1, wherein the one end of the stiffener is joined to a side portion of the body frame in the vehicle width direction. The suspension arm support structure according to claim 1 , wherein the outer support wall is joined to a member constituting a side wall of the vehicle body. 4. The stiffener according to claim 1, wherein a hole is formed in a portion where the plate nut is welded, and a bead extends radially from the hole. 5. The suspension arm support structure according to the item. The suspension arm is supported by the support bolt via a bush,
The bush has an inner collar supported by the support bolt, an outer collar supported by the suspension arm, and a bush rubber provided between the inner collar and the outer collar,
The said support bolt penetrates the said outer side support wall, the said inner collar, and the said inner side support wall, and is screwed together to the said plate nut, The Claim 1 characterized by the above-mentioned. Suspension arm support structure.

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