JP2019059438A - Mounting structure for vehicular suspension - Google Patents

Abstract

To provide a mounting structure for a vehicular suspension, which is able to improve torsion rigidity of a mounting member.SOLUTION: A mounting structure for a vehicular suspension comprises: a vehicle rear member having a bottom part 111 and a pair of upward extending parts 112; a bracket 20 having side parts 21 suspending from both ends, in a vehicle width direction, of the bottom part 111, and a bent part 22 connected to front ends of the pair of side parts 21 and directed in forward and backward directions of the vehicle; a support shaft 31 allowed to communicate with the pair of side parts 21; and an auxiliary rigid member 40 having a first auxiliary rigid part 41 and a second auxiliary rigid part 42. A first hollow area 51 crossing the boundary between the upward extending parts 112 and the side parts 21 and extending in the forward and backward directions of the vehicle is provided between the upward extending parts 112 and side parts 21 and the first auxiliary rigid part 41. A second hollow area 52 extending in a vertical direction of the vehicle and communicating with a front end of the first hollow area 51 is provided between the boundary between the side parts 21 and bent part 22 and the boundary between the first auxiliary rigid part 41 and the second auxiliary rigid part 42.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a mounting structure of a front end of a trailing arm that constitutes a rear suspension of a vehicle.

  A front end of a trailing arm that constitutes a rear suspension of a vehicle is attached to a groove-shaped bracket joined in a state of being suspended from a vehicle rear member (such as a rear side member). A support shaft arranged along the vehicle width direction is fixed to the bracket, and a front end of the trailing arm is supported by the support shaft so as to be rotatable around the vehicle width direction. . Patent Document 1 discloses an example of the mounting structure of such a trailing arm.

  When the vehicle turns or the like, a twist around the vehicle vertical direction acts on a support shaft that supports the front end of the trailing arm. Therefore, a twisting moment caused by the twist acts on the brackets located on both sides of the support shaft in the vehicle width direction. If the amount of deformation of the bracket is increased due to the torsion moment causing the bracket to be deformed, there is a concern that the stability of the vehicle steering may be reduced. Therefore, among the brackets, a bracket positioned outward in the vehicle width direction can be joined to a vehicle rear member such as a rocker panel to improve the torsional rigidity. On the other hand, the bracket located inward in the vehicle width direction may take measures to increase the member thickness and strength of the bracket in order to improve the torsional rigidity. However, such measures have the problem of causing an increase in vehicle weight and production cost.

JP, 2014-184883, A

  An object of the present invention is to provide a mounting structure for a vehicle suspension capable of improving the torsional rigidity of a mounting member with a relatively simple structure.

  According to the present invention, there is provided a vehicle rear member having a bottom portion facing downward of the vehicle and extending in the longitudinal direction of the vehicle, and a pair of upright portions erecting upward from the both widthwise ends of the bottom portion. The vehicle rear member has a pair of side portions extending from both ends in the vehicle width direction along the longitudinal direction of the vehicle, and a bending portion connected to the front end of each side portion and facing the longitudinal direction of the vehicle A bracket, a support shaft in communication with the pair of the side portions and rotatably supporting the front end of the trailing arm in the vehicle width direction, and the upright standing at least one of the vehicle width direction inward and outward A stiffener having a first stiffener joined to both the part and the side, and a second stiffener connected to the front end of the first stiffener and joined to the inflector; And the standing portion and the A first hollow region extending across the boundary between the rising portion and the side portion in the vehicle vertical direction and extending in the vehicle longitudinal direction is provided between the side portion and the first stiffening portion, It extends in the vertical direction of the vehicle between the boundary between the side portion and the refracting portion and the boundary between the first stiffening portion and the second stiffening portion, and leads to the front end of the first hollow area. There is provided a mounting structure for a vehicle suspension characterized in that a second hollow area is provided.

  A first hollow area and a second hollow area are provided between the vehicle rear member and the bracket that constitute the mounting structure of the vehicle suspension according to the present invention and the stiffener. The first hollow region is provided between the upright portion and the side portion and the first stiffening portion when viewed from the front-rear direction of the vehicle. The first hollow region straddles the boundary between the rising portion and the side portion in the vehicle vertical direction, and extends in the vehicle longitudinal direction. The second hollow area is provided between the boundary between the side portion and the refracting portion and the boundary between the first stiffening portion and the second stiffening portion when viewed from the vertical direction of the vehicle. The second hollow area extends in the vertical direction of the vehicle and communicates with the front end of the first hollow area. The first hollow area and the second hollow area form an L-shaped closed cross-sectional structure between the bracket and the stiffener as viewed from the vehicle width direction. The closed cross-sectional structure can improve the torsional rigidity of the bracket. Therefore, according to the mounting structure for a vehicle suspension according to the present invention, it is possible to improve the torsional rigidity of the mounting member (bracket) with a relatively simple structure.

  Other features and advantages of the present invention will become more apparent from the detailed description given below based on the attached drawings.

FIG. 1 is a perspective view of an example of a vehicle body to which a mounting structure for a vehicle suspension according to the present invention is applied. It is a top view of an example of the vehicle body to which the attachment structure shown in FIG. 1 is applied. It is sectional drawing in alignment with the III-III line of FIG. It is sectional drawing in alignment with the IV-IV line of FIG. It is sectional drawing in alignment with the VV line | wire of FIG. It is a perspective view of the bracket (inner side bracket) which comprises the attachment structure shown in FIG.

  DESCRIPTION OF EMBODIMENTS A mode for carrying out the present invention (hereinafter, referred to as “embodiment”) will be described based on the attached drawings.

  A mounting structure for a vehicle suspension according to an embodiment of the present invention (hereinafter referred to as “mounting structure A”) will be described based on FIGS. 1 to 6. The mounting structure A is constituted by the rear side member 11, the bracket 20, the support shaft 31 and the stiffener 40. In the present embodiment, the rear side member 11 corresponds to the "vehicle rear member" recited in the claims of the present invention. Further, in the present specification, the mounting structure A of the right rear wheel of the vehicle will be described. Among these drawings, FIG. 1 is a view looking from the inside in the vehicle width direction toward the right side. FIG. 2 shows the rear side member 11 which is transmitted through the rear side member 11 for convenience of understanding and which is transmitted by an imaginary line (two-dot chain line). FIG. 4 is a cross-sectional view taken along an alternate long and short dash line shown in FIG.

  Here, for convenience of explanation, let u pr shown in these figures be upward in the vehicle, dw be vehicle downward, fr be vehicle forward, rr be vehicle backward, rh be vehicle right and l h be vehicle left. . In the following description, when the upper and lower sides are used without any special description, the upper and lower sides of the vehicle in the vertical direction are referred to. Moreover, when using front and rear without special mention, it points to the front and rear of the vehicle front-back direction.

  As shown in FIGS. 1 to 3, the rear side member 11 is joined to the right end of a rear floor panel (not shown) located at the rear of the vehicle and extends in the vehicle longitudinal direction. The rear side member 11 is also joined to the left end of the rear floor panel. As shown in FIGS. 1 and 3, the rear side member 11 has a bottom 111 and a pair of uprights 112. The bottom portion 111 faces downward of the vehicle and extends in the longitudinal direction of the vehicle. The pair of upright portions 112 stand upright from the both ends of the bottom portion 111 in the vehicle width direction toward the upper side of the vehicle. The pair of upright portions 112 includes an inner upright portion 112A and an outer upright portion 112B. The inner rising portion 112 </ b> A is located at an inner end (left end) in the vehicle width direction of the bottom portion 111. The outer rising portion 112 </ b> B is located at the outer end (right end) of the bottom portion 111 in the vehicle width direction. The inner rising portion 112A and the outer rising portion 112B are spaced apart from each other and opposed to each other in the vehicle width direction. At the rear of the vehicle, a closed cross-sectional structure is formed by the rear floor panel and the rear side member 11. For this reason, the rear side members 11 constitute a pair of left and right skeletal structures at the rear of the vehicle.

  The rocker panel 12 is located outward in the vehicle width direction with respect to the rear side member 11, as shown in FIGS. The upper end of the rocker panel 12 is joined to the outer standing portion 112 B of the rear side member 11.

  As shown in FIGS. 1 to 5, the bracket 20 is joined to the bottom portion 111 of the rear side member 11 and hangs downward from both ends of the rear side member 11 in the vehicle width direction. The bracket 20 has a pair of side portions 21, a bent portion 22, a top portion 23 and a hooked portion 24. In the present embodiment, the bracket 20 is composed of an inner bracket 20A and an outer bracket 20B, which are separated from each other. The inner bracket 20A drops from the vehicle width direction inner end (left end) of the bottom portion 111 toward the lower side of the vehicle. The inner bracket 20A has an inner portion 211, an inner refracting region 221, and an inner region 231. Further, the outer bracket 20B is dropped from the outer end (right end) of the bottom portion 111 in the vehicle width direction toward the lower side of the vehicle. The outer bracket 20B has an outer portion 212, an outer refracting region 222, an outer region 232, and a barbed portion 24.

  As shown in FIGS. 1 to 4, the pair of side portions 21 hangs downward from both ends in the vehicle width direction of the bottom portion 111 of the rear side member 11 along the longitudinal direction of the vehicle. The pair of side portions 21 includes an inner portion 211 (inner bracket 20A) and an outer portion 212 (outer bracket 20B). The inner portion 211 is located at the inward end (left end) of the bottom portion 111 in the vehicle width direction. The outer side portion 212 is located at the outer end (right end) of the bottom portion 111 in the vehicle width direction. The inner portion 211 and the outer portion 212 are spaced apart from each other in the vehicle width direction and face each other. The inside portion 211 is provided with a mounting hole 211A penetrating in the vehicle width direction. The outer side portion 212 is provided with a mounting hole 212A penetrating in the vehicle width direction. The central position and size of the mounting hole 212A correspond to the mounting hole 211A.

  As shown in FIG. 1, FIG. 2 and FIG. 4, the refracting portion 22 is connected to the front ends of the pair of side portions 21 and faces in the vehicle longitudinal direction. The refractive portion 22 has an inner refractive area 221 (inner bracket 20A) and an outer refractive area 222 (outer bracket 20B). The inward refracting region 221 is connected to the front end of the inboard portion 211 and extends outward in the vehicle width direction. The outer refracting area 222 is connected to the front end of the outer portion 212 and extends inward in the vehicle width direction. The inner refraction area 221 and the outer refraction area 222 are separated from each other in the vehicle width direction.

  As shown in FIGS. 2, 3 and 5, the top 23 is connected to the upper end of the pair of side portions 21 and joined to the bottom 111 of the rear side member 11. The top 23 has an inner area 231 (inner bracket 20A) and an outer area 232 (outer bracket 20B). The inner region 231 extends outward in the vehicle width direction from the upper end of the inner portion 211 and is directed in the vertical direction of the vehicle. The outer region 232 extends inward in the vehicle width direction from the upper end of the outer portion 212 and faces in the vertical direction of the vehicle. The inner area 231 and the outer area 232 are separated from each other in the vehicle width direction.

  As shown in FIGS. 1 to 3, the hook-like portion 24 extends outward in the vehicle width direction from the lower end of the outer side portion 212 of the outer bracket 20B, and then hangs downward in the vehicle. The hooked portion 24 is joined to the rocker panel 12 from the inside in the vehicle width direction.

  As shown in FIG. 6, in the inner bracket 20A, the boundary between the inner portion 211 and the inner region 231, the boundary between the inner portion 211 and the inner refractive region 221, and the boundary between the inner refractive region 221 and the inner region 231. The notch surface 25 (hatching area | region) which straddles each of is formed. Due to the formation of the notched surface 25, the boundary between the inner portion 211 and the inner region 231 is concaved obliquely downward with respect to the vehicle width direction when viewed from the vehicle longitudinal direction as shown in FIG. 3. It has become. Further, as shown in FIG. 4, the boundary between the inner portion 211 and the inward refracting region 221 is concaved obliquely rearward with respect to the vehicle width direction when viewed from the vertical direction of the vehicle. Furthermore, as shown in FIG. 5, the boundary between the inward refracting region 221 and the inward region 231 is recessed downward obliquely with respect to the longitudinal direction of the vehicle when viewed from the vehicle width direction.

  The support shaft 31 is in communication with the pair of side portions 21 of the bracket 20 as shown in FIGS. 3 and 4. Specifically, the support shaft 31 is in communication with both the attachment hole 211A of the inner portion 211 (inner bracket 20A) and the attachment hole 212A of the outer portion 212 (outer bracket 20B). The support shaft 31 is, for example, a bolt and a nut. The support shaft 31 penetrates a gap provided between the pair of side portions 21 in the vehicle width direction. The tip end portion 321 located at the front end of the trailing arm 32 is accommodated in the gap. The tip end portion 321 is supported by the support shaft 31. The support shaft 31 supports the tip end portion 321 rotatably around a vehicle width direction (around the support shaft 31 in the axial direction). In the present embodiment, the trailing arm 32 is a lower control arm. Further, as shown in FIGS. 3 and 4, an auxiliary bracket 29 is sandwiched between the outer side portion 212 of the outer bracket 20B and the support shaft 31 in the vehicle width direction. The auxiliary bracket 29 is penetrated by the support shaft 31 in the vehicle width direction. The auxiliary bracket 29 improves the bending rigidity of the outer portion 212 while reducing the bearing pressure acting on the outer portion 212 by the support shaft 31.

  The stiffener 40 is, as shown in FIGS. 1 to 4, a part of the upright portion 112 of the rear side member 11 positioned at least one inward and outward in the vehicle width direction and the side 21 of the bracket 20. It covers both sides and is located forward of the pair of refracting portions 22 of the bracket 20 in the vehicle. The stiffener 40 has a first stiffening portion 41 and a second stiffening portion 42. The first stiffening portion 41 is joined to both the upstanding portion 112 and the side portion 21 positioned at least one inward and outward in the vehicle width direction. In the present embodiment, the first stiffening portion 41 is joined to both the inner standing portion 112A and the inner portion 211 (inner bracket 20A). The first stiffening portion 41 covers a part of the inner standing portion 112A and the inner portion 211 from the inside in the vehicle width direction. The first stiffening portion 41 is penetrated by the support shaft 31 in the vehicle width direction. The second stiffening portion 42 is connected to the front end of the first stiffening portion 41 and faces in the vehicle longitudinal direction. The second stiffening portion 42 is joined to the bending portion 22 connected to the side portion 21 to which the first stiffening portion 41 is joined. In the present embodiment, the second stiffening portion 42 is joined to the inner refraction area 221 (inner bracket 20A). The inward refracting region 221 is covered by the second stiffening portion 42 from the front of the vehicle. The second stiffening portion 42 has a first joint 421 and a second joint 422. The first joint portion 421 extends from the upper end of the second stiffening portion 42 toward the front of the vehicle, and is joined to the bottom portion 111 of the rear side member 11. The second joint portion 422 extends from the outer end (left end) of the second stiffening portion 42 in the vehicle width direction toward the front of the vehicle, and is joined to the rocker panel 12. For this reason, the outer refraction area 222 (outside bracket 20B) is also covered by the second stiffening portion 42 from the front of the vehicle. In the present embodiment, the second stiffening portion 42 is also joined to the outer refraction area 222.

  As shown in FIG. 3, when viewed from the longitudinal direction of the vehicle, the rising portion 112 (the inner rising portion 112A) and the side portion 21 (the inner portion 211 of the inner bracket 20A) of the rear side member 11 and the first stiffener 40 A first hollow area 51 is provided between the stiffening portion 41 and the first hollow area 51. The first hollow area 51 is surrounded by the upright portion 112, the side portion 21 and the first stiffening portion 41. The first hollow region 51 straddles the boundary between the upright portion 112 and the side portion 21 in the vehicle vertical direction, and extends in the vehicle longitudinal direction. Further, as shown in FIG. 4, when viewed from the vertical direction of the vehicle, the boundary between the side portion 21 (inner portion 211) and the refracting portion 22 (inner refracting region 221 of the inner bracket 20A) and the first stiffening portion 41. A second hollow region 52 is provided between the two and the boundary between the second stiffening portion 42 of the stiffener 40 and the second stiffening portion 42. The second hollow area 52 is surrounded by these two boundaries. The second hollow area 52 extends in the vertical direction of the vehicle and communicates with the front end of the first hollow area 51. Furthermore, in the present embodiment, as shown in FIG. 5, a third portion is provided between the second stiffening portion 42 and the boundary between the refracting portion 22 (the inner refracting region 221) and the top portion 23 (the inner region 231). A hollow area 53 is provided. The third hollow region 53 is surrounded by the bottom portion 111 of the rear side member 11, the bending portion 22 and the second stiffening portion 42. The third hollow area 53 extends in the vehicle width direction and communicates with the upper end of the second hollow area 52.

  Next, the operation and effect of the mounting structure A will be described.

  A first hollow area 51 and a second hollow area 52 are provided between the rear side member 11 and the bracket 20 (inner bracket 20A) constituting the mounting structure A and the stiffener 40. The first hollow area 51 is provided between the rising portion 112 of the rear side member 11 and the side portion 21 of the bracket 20 and the first stiffening portion 41 of the stiffening member 40 when viewed from the longitudinal direction of the vehicle. . The first hollow region 51 straddles the boundary between the upright portion 112 and the side portion 21 in the vehicle vertical direction, and extends in the vehicle longitudinal direction. Further, the second hollow region 52 is a boundary between the side portion 21 and the refracting portion 22 of the bracket 20 and the first stiffening portion 41 and the second stiffening portion 42 of the stiffening member 40 when viewed from the vertical direction of the vehicle. And the boundary between the The second hollow area 52 extends in the vertical direction of the vehicle and communicates with the front end of the first hollow area 51. The first hollow area 51 and the second hollow area 52 form an L-shaped closed cross-sectional structure between the bracket 20 and the stiffener 40 as viewed in the vehicle width direction. The closed cross-sectional structure is relatively rigid and can reduce the torsional stress transmitted to the bracket 20. Therefore, the torsional rigidity of the bracket 20 can be improved by the closed cross-sectional structure. Therefore, according to the mounting structure A, it is possible to improve the torsional rigidity of the mounting member (bracket 20) with a relatively simple structure.

  In the present embodiment, both the first hollow area 51 and the second hollow area 52 can be obtained by providing the cutout surface 25 in the bracket 20 (inner bracket 20A). Besides this, a bead protruding in the vehicle width direction is provided in the first stiffening portion 41, and a bead protruding in the diagonally forward direction with respect to the vehicle width direction is at the boundary between the first stiffening portion 41 and the second stiffening portion 42. Also by providing, both the 1st hollow area 51 and the 2nd hollow area 52 can be obtained.

  In the present embodiment, a third hollow area 53 is provided between the boundary between the bent portion 22 and the top 23 of the bracket 20 and the second stiffening portion 42 of the stiffener 40. The third hollow area 53 extends in the vehicle width direction and communicates with the upper end of the second hollow area 52. By adopting such a configuration, the torsional rigidity of the bracket 20 can be further improved. Further, in the present embodiment, the second stiffening portion 42 is joined to the rocker panel 12 at the second joint portion 422. By adopting such a configuration, the torsional rigidity of the bracket 20 can be further improved, and the stiffener 40 can resist bending in the longitudinal direction of the vehicle accompanying acceleration and deceleration of the vehicle.

  In the present embodiment, the bracket 20 is composed of the inner bracket 20A and the outer bracket 20B which are separated from each other, but they may be integrated.

  In the present embodiment, the first stiffening portion 41 of the stiffener 40 is the upright portion 112 (inner upright portion 112A) of the rear side member 11 positioned inward in the vehicle width direction and the side portion 21 of the bracket 20 (inner bracket 20A). It is the structure joined to both of inner side part 211). Other than this, the first stiffening portion 41 is configured to be joined to the upright portion 112 (outside upright portion 112B) and the side portion 21 (outer side portion 212 of the outer bracket 20B) located outward in the vehicle width direction It is also good. Furthermore, the first stiffening portion 41 is disposed both inward and outward in the vehicle width direction, and is joined to one upright portion 112 and side portion 21 and the other upright portion 112 and side portion 21, respectively. The configuration may be different.

  In the present specification, the mounting structure A of the right rear wheel of the vehicle is described, but the mounting structure A according to the present invention can also be applied to the left rear wheel of the vehicle.

  The present invention is not limited to the embodiments described above. The specific configuration of each part of the present invention can be varied in design in many ways.

A: Mounting structure 11: Rear side member (vehicle rear member)
111: Bottom portion 112: Standing portion 112A: Inner standing portion 112B: Outer standing portion 12: Rocker panel 20: Bracket 20A: Inner bracket 20B: Outer bracket 21: Side portion 211: Inner portion 211A: Mounting hole 212: Outer portion 212A A: Mounting hole 22: Refracting portion 221: Inner refracting region 222: Outer refracting region 23: Top 231: Inner region 232: Outer region 24: Wedge portion 25: Notched surface 29: Auxiliary bracket 31: Support shaft 32: Trailing arm 321: tip portion 40: stiffener 41: first stiffener 42: second stiffener 421: first joint 422: second joint 51: first hollow zone 52: second hollow zone 53: first 3 hollow area

Claims (1)

A vehicle rear member having a bottom portion facing downward of the vehicle and extending in the longitudinal direction of the vehicle, and a pair of upright portions standing upright toward the upper side of the vehicle from both ends in the vehicle width direction of the bottom portion;
The vehicle rear member has a pair of side portions that drop from both ends in the vehicle width direction of the bottom along the vehicle longitudinal direction, and a bending portion connected to the front ends of the pair of side portions and facing the vehicle longitudinal direction With joined brackets,
A support shaft which is in communication with the pair of the side portions and rotatably supports the front end of the trailing arm about the vehicle width direction;
It connects to the front end of the first stiffening portion joined to both the rising portion and the side portion located at least one in the vehicle width direction inward and outward, and is connected to the front end of the first stiffening portion and to the bending portion A stiffener having a joined second stiffener,
A first hollow region straddling the boundary between the rising portion and the side portion in the vehicle vertical direction and extending in the vehicle longitudinal direction between the rising portion and the side portion and the first stiffening portion is provided. Provided
It extends in the vertical direction of the vehicle between the boundary between the side portion and the inflecting portion and the boundary between the first stiffening portion and the second stiffening portion, and at the front end of the first hollow region. A mounting structure for a suspension for a vehicle, characterized in that a second hollow region is provided.

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