JP2012180056A - Trailing arm support structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a size and weight of a trailing arm support structure by improving a rigidity thereof.SOLUTION: This trailing arm support structure is arranged in a side sill extension 4. In the side sill extension, a corner ridge part 45 includes a recessed part 49 recessed to a vehicle outer side and an upper side and delimited by a recessed part upper wall part 51 and a recessed part sidewall part 52; a bracket 65 mounted with a support shaft 75 between the recessed part sidewall part and itself is welded to an in-vehicle side face of an in-vehicle sidewall part on the upper side of the recessed part; and the bracket includes a seating 67 around the support shaft, and a plurality of reinforcing beads 70 each extending from a peripheral part 68 of the seating to a joint part to the recessed part sidewall part and convexed to the side opposite to the recessed part side. The side sill extension has reinforcing beads 57 each extending from the in-vehicle sidewall part to the recessed part upper wall part, and convexed to the side opposite to the bracket and to the side opposite to the recessed part.

Description

  The present invention relates to a trailing arm support structure, and more particularly to a structure that pivotally supports a front end portion of a trailing arm on a vehicle body frame.

  Brackets that form a pair of opposing side walls project from the left and right sides of the body frame of the automobile, a support shaft is fixed between the pair of side walls, and the front ends of the left and right trailing arms are connected to the support shaft via bushes. A trailing arm support structure is known in which a trailing arm is pivotally supported on a vehicle body frame by pivotally supporting the frame (for example, Patent Document 1).

Patent No. 4075445

  In the trailing arm support structure as described above, if one end of the support shaft is fixed to a side sill that forms a part of the vehicle body frame and only the other end is fixed to the bracket, the bracket can be reduced in size, and further the tray The overall size of the ring arm support structure can be reduced. In order to further reduce the size and weight of such a trailing arm support structure, it is necessary to increase the rigidity of the bracket alone and the rigidity of the trailing arm support structure formed by the bracket and the side sill. is there.

  The present invention has been made in view of the above background, and it is an object of the present invention to increase the rigidity of the trailing arm support structure and to reduce the size and weight.

  In order to solve the above problems, the present invention is provided at the rear end (4) of the side sill (2) extending in the vehicle longitudinal direction on both sides of the vehicle body in order to support the front end of the trailing arm (90). In the trailing arm support structure, the side sill has a substantially square shape including an upper wall portion (43), a vehicle inner side wall portion (41), a lower wall portion (42), and a vehicle outer side wall portion (5) in the front portion. The rear end portion of the rear end portion has a corner ridge portion (45) formed between the vehicle interior side wall portion and the lower wall portion, which is recessed toward the vehicle outer side and the upper side. A concave portion (49) defined by a wall portion (51) and a concave side wall portion (52) extending from the concave upper wall portion to the lower wall portion, and the vehicle interior side wall portion above the concave portion. The vehicle inner side surface extends downward and faces the concave side wall portion, and the concave portion A bracket (65) to which a support shaft (75) that pivotally supports the front end of the trailing arm is joined to a wall portion, and the bracket is connected to the trailing arm around a portion to which the support shaft is attached. And a plurality of brackets that protrude from the edge (68) of the seat to the joint portion with the vehicle interior side wall and that protrude to the side opposite to the recess side. The side sill has a reinforcing bead (70), and the side sill extends from the vehicle interior side wall portion above the concave portion to the concave upper wall portion, and is convex on the side opposite to the bracket and on the side opposite to the concave side. It has a reinforcing bead (57).

  According to this configuration, since the front end portion of the trailing arm is received in the concave portion formed in the side sill, each configuration can be arranged at high density to effectively use the space. Moreover, the bracket reinforcement bead and the side sill reinforcement bead can reinforce the recesses of the bracket and the side sill, thereby increasing the rigidity of the trailing arm support structure. Thereby, thickness reduction and size reduction of a bracket are attained.

  Another aspect of the present invention is characterized in that each of the bracket reinforcement beads is disposed at a distance from each other, and the bracket is welded to the inner wall of the vehicle between adjacent bracket reinforcement beads.

  According to this configuration, the rigidity of the joint portion between the bracket and the side sill can be increased.

  According to another aspect of the present invention, each of the bracket reinforcing beads and each of the portions of the side sill reinforcing beads provided on the side wall portion of the vehicle are arranged to face each other, and the bracket reinforcing beads and the side sill reinforcing A closed cross section is formed by a portion of the bead provided on the inner wall portion of the vehicle.

  According to this configuration, a closed cross-sectional structure can be formed by the bracket and the side sill, and the rigidity of the trailing arm support structure can be increased.

  Another aspect of the present invention is characterized in that the seat has a disk shape and bulges toward the side wall of the recess at the peripheral edge (68).

  According to this configuration, the rigidity of the bracket can be increased.

  In another aspect of the present invention, the rear end of the recess side wall is connected to the vehicle outer wall (5) by a lid member (61) that closes the rear end of the side sill except for the recess. It is characterized by.

  According to this structure, the rigidity of the recessed part of a side sill can be improved.

  According to the above configuration, the rigidity of the trailing arm support structure can be increased, and the size and weight of the bracket can be reduced.

An exploded perspective view of the left side of the vehicle body as viewed from the outside of the vehicle An exploded perspective view of the left side of the vehicle body as viewed from the inside of the vehicle Perspective view of side sill extension viewed from outside An exploded perspective view of the side sill extension and side sill stiffener viewed from the outside of the vehicle Perspective view of the trailing arm support structure as seen from the rear Bottom view showing the rear structure of the vehicle The perspective view which looked at the trailing arm support structure from the direction of arrow VII of FIG. The perspective view which looked at the trailing arm support structure from the direction of arrow VIII of FIG. IX-IX sectional view of FIG. XX sectional view of FIG.

  Hereinafter, an embodiment in which a trailing arm support structure of the present invention is applied to a vehicle body 1 of an automobile will be described in detail with reference to the drawings. In the following description, the forward direction of the vehicle body is defined as the front, the left / right direction is determined based on this, and the upper vertical direction is defined as the upper direction. In addition, since the vehicle body 1 to be described below is generally left-right symmetrical, only the left half portion will be described, and description of the same configuration of the right half portion will be omitted. Further, each element of the vehicle body 1 described below is formed by press forming a steel plate unless otherwise specified.

  As shown in FIGS. 1 and 2, a vehicle body 1 of a four-door vehicle has a pair of left and right side sills 2 extending in the front-rear direction on both lower side portions. The side sill 2 reinforces the side sill 2 and the side sill extension 4 connected to the rear end of the side sill inner panel 3, the side sill outer panel 5, and the side sill 2. Side sill stiffener 6.

  Each of the side sill inner panel 3 and the side sill extension 4 has a hat shape in which the cross-sectional shape opens toward the vehicle outer side and has flanges at the upper and lower edges. The side sill outer panel 5 has a hat shape in which a cross-sectional shape opens toward the vehicle inner side and has flanges at upper and lower edges. The side sill inner panel 3, the side sill extension 4, and the side sill outer panel 5 have upper and lower edge flanges joined together to form a closed section. The side sill stiffener 6 is interposed between the side sill inner panel 3 and the side sill extension 4 and the id sill outer panel 5.

  In the present embodiment, the side sill inner panel 3 and the side sill extension 4 are formed of separate members. However, in another embodiment, the side sill inner panel 3 and the side sill extension 4 may be formed of a single member.

  The pair of left and right side sill inner panels 3 and side sill extensions 4 are connected to each other by a center floor cross member 8, a middle floor cross member 9 and a front floor 10.

  The front ends of a pair of left and right rear frames 11 are joined to the upper part of the rear end portion of each side sill extension 4. The rear frame 11 has a kick-up portion 12 that extends from the joint portion of the side sill extension 4 to the vehicle interior and obliquely upward and rearward, and a horizontal portion 13 that extends substantially rearward from the rear end of the kick-up portion 12. Yes. The rear frame 11 is formed of a U-shaped rear frame lower 15 whose cross section opens upward, and a rear frame upper 16 that closes the upper opening of the rear frame lower 15 to form a closed cross section. The pair of left and right rear frames 11 are connected to each other by a rear floor panel 17, a middle floor cross member 9, and a middle seat cross member 18 (see FIG. 6) disposed below the rear floor panel 17.

  A rear inner panel 21 is joined to the outer side of the rear frame 11 in the vehicle width direction along the rear frame 11. The rear inner panel 21 constitutes a rear side wall of the vehicle body 1 and includes a wheel house portion 22 that houses a rear wheel 93 (see FIG. 6) and a damper mounting seat 23 that supports an upper end of a rear damper (not shown). Yes.

  As shown in FIG. 1, the side sill outer panel 5 is combined with a rear side outer panel 26 that forms a rear outer shell of the vehicle body 1, a center pillar stiffener 27, and the like to constitute an outer panel assembly 31. The outer panel assembly 31 is pre-assembled with side sill stiffeners 6 and center pillar stiffeners.

  As shown in FIG. 3, the front portion of the side sill extension 4 includes a vehicle inner wall portion 41 extending in the vertical direction, a lower wall portion 42 extending horizontally from the lower edge of the vehicle inner wall portion 41 to the vehicle outer side, and the vehicle inner wall wall. It has an upper wall portion 43 (see FIG. 4) that extends horizontally from the upper edge of the portion 41 to the outside of the vehicle, and is formed in a U-shaped cross section. A corner ridge 45 bent at a right angle is formed at the boundary between the vehicle interior side wall 41 and the lower wall 42. A flange portion 46 extending downward is formed on the outer edge of the lower wall portion 42, and a flange portion 47 extending upward is formed on the outer edge of the upper wall portion 43.

  The rear part of the side sill extension 4 is widened so that the width gradually increases inward and upward as the vehicle moves rearward. Further, the rear part of the side sill extension 4 has a shape in which a corner ridge 45 is recessed outward and upward, and is provided with a recess 49 on the inner side and in the lower part. The concave portion 49 is defined by a concave upper wall portion 51 that is continuous with the vehicle interior side wall portion 41 and a concave portion side wall portion 52 that is continuous with the concave portion upper wall portion 51 and is continuous with the lower wall portion 42. The concave upper wall portion 51 is arranged so as to be inclined downward as it goes forward, and its front end is continuous with the lower wall portion 42. A corner ridge 53 that is bent at a right angle is formed at the boundary between the concave upper wall 51 and the vehicle inner wall 41.

  The front end portion of the rear frame lower 15 is joined to the rear end portion of the concave upper wall portion 51 and the vehicle interior side wall portion 41 of the side sill extension 4. The upper wall portion 43 of the rear end portion of the side sill extension 4 is cut off. The part of the upper wall portion 43 cut off is closed by a rear frame upper 16 that extends forward from the rear frame lower 15. The front end of the rear frame upper 16 is joined to the rear end of the upper wall portion 43 and the vehicle interior side wall portion 41.

  A plurality of reinforcing beads 56 (two in the present embodiment) are formed on the vehicle interior side wall 41 of the side sill extension 4 so as to bulge outward from the vehicle and extend in the front-rear direction. A plurality of (three in this embodiment) reinforcing beads 57 are formed on the vehicle interior side wall 41 and the concave upper wall 51 at the rear of the side sill extension 4 so as to straddle the corner ridge 53. Each reinforcing bead 57 bulges outward in the vehicle inner wall 41 and bulges upward in the concave upper wall 51 and extends in a direction perpendicular to the ridgeline of the corner ridge 53. Each reinforcing bead 56, 57 is formed by press forming a steel plate.

  As shown in FIGS. 4 and 5, when the side sill outer panel 5 is joined to the side sill extension 4, the opening formed at the rear end of the side sill 2 is closed by the end plate 61. The end plate 61 is disposed so that the main surface faces in the front-rear direction, and has a flange portion 62 that is bent rearward at the peripheral edge portion excluding the upper edge portion. The end plate 61 has a flange portion 62 joined to the vehicle outer surface of the rear frame lower 15, the vehicle outer surface of the recessed side wall portion 52, the upper surface of the lower wall portion 42, and the inner surface of the side sill outer panel 5. Joined to the lower edge of the front end of the wheel house portion 22 of the inner panel 21, the rear end of the side sill 2 is closed. The end plate 61 is joined to the side sill stiffener 6 at the front surface thereof.

  A bearing hole 63 is formed in the recess side wall portion 52 and the flange portion 62 of the end plate 61 joined to the recess side wall portion 52 so as to penetrate both members coaxially and in the same shape.

  As shown in FIGS. 5 and 6, a bracket 65 is joined to the vehicle interior side surface of the vehicle interior side wall 41 at the rear portion of the side sill extension 4. The bracket 65 is a press-formed product of a steel plate, has a substantially plate shape, and is joined to the vehicle interior side surface of the vehicle interior side wall portion 41 by welding at an upper portion thereof. The bracket 65 extends so as to cover the right side of the recess 49 downward and rearward from the joint portion with the vehicle interior side wall portion 41. A lower portion of the bracket 65 has a bearing hole 66 that faces the concave side wall portion 52 via a gap and is coaxial with the bearing hole 63. A circular planar receiving seat 67 is formed around the bearing hole 66 as a portion facing a front end portion of a trailing arm 90 described later. The seat 67 protrudes from the upper part of the bracket 65 to the vehicle outer side (left side) at the peripheral edge 68 and is formed in a stepped manner.

  As shown in FIGS. 7 and 8, a plurality (three in this embodiment) of reinforcing beads 70 extending from the peripheral edge 68 of the receiving seat 67 to the upper edge 69 are formed on the upper portion of the bracket 65. Each reinforcing bead 70 bulges to the side (the vehicle inner side, the right side) opposite to the vehicle interior side wall 41 side. Further, as shown in FIGS. 9 and 10, each reinforcement bead 70 is opposed to the reinforcement bead 57 of the vehicle interior side wall 41 and extends along the reinforcement bead 57 with the bracket 65 attached to the vehicle interior side wall 41. So that they are spaced apart from each other. As a result, as shown in FIG. 10, the reinforcing bead 70 and the portion of the reinforcing bead 57 provided on the vehicle interior side wall 41 coincide with each other to form a closed cross-sectional structure.

  As shown in FIGS. 5, 6, and 10, the side edge 71 extending from the peripheral edge 68 of the receiving seat 67 to the upper edge 69 in the bracket 65 is convex on the vehicle inner side (the side opposite to the vehicle inner wall 41). It is curved in an arc shape and is formed so that the end surface faces the outside of the vehicle.

  As shown in FIG. 7 and FIG. 10, the bracket 65 is configured so that the bracket 65 has a portion of the vehicle interior side wall 41 at a portion between the reinforcement beads 70 and a portion between the reinforcement beads 70 and the side edge portions 71. It is welded to the inner side of the car. That is, the welded portions are dispersed by the reinforcing beads 70 and are staggered. You may perform a welding location by arbitrary number and area in each part.

  As shown in FIG. 9, a weld nut 74 is welded to a portion of the bearing hole 66 of the bracket 65 facing the vehicle inside. In the recess side wall 52, the bearing hole 63 of the end plate 61 and the bearing hole 66 of the bracket 65, a support shaft 75 having a male screw at the distal end and a hexagonal columnar head at the proximal end is provided on the end plate 61 side. It is inserted from (vehicle outside). The support shaft 75 is fixed to the bracket 65, the recessed side wall portion 52, and the end plate 61 by screwing the front end portion thereof to the weld nut 74. The front end portion of the trailing arm 90 is supported on the support shaft 75 via the bush 76. The bush 76 is, for example, rubber interposed between the inner cylinder 81 supported by the support shaft 75, the outer cylinder 82 arranged coaxially with the inner cylinder 81, and the inner cylinder 81 and the outer cylinder 82. And a flexible member 83. The outer cylinder 82 is received in a bush receiving hole 92 of a connecting portion 91 provided at the front end of the trailing arm 90, and is fixed by welding or the like.

  The trailing arm 90 includes an axle (not shown) that extends rearward and supports the rear wheel 93. The trailing arms 90 are provided as a pair of left and right, and are connected to each other by a cross beam 94 extending in the vehicle width direction.

  As described above, the trailing arm support structure including the side sill extension 4 and the bracket 65 supports the trailing arm 90 rotatably on the vehicle body 1 including the side sill 2.

  Since the trailing arm support structure of the present embodiment has a structure in which one end of the support shaft 75 is supported by the side sill extension 4 and the other end is supported by the bracket 65, when forming a bracket that supports both ends of the support shaft 75. In comparison, the bracket 65 can be reduced in size and weight. Further, since the concave portion 49 is formed in the side sill extension 4 and the front end of the trailing arm 90 is accommodated in the concave portion 49, each member can be arranged at high density, and the space can be effectively used.

  The bracket 65 has increased rigidity by bending the peripheral edge 68 of the receiving seat 67, forming the reinforcing bead 70, and bending the side edge 71. Further, the bracket 65 is further enhanced in rigidity by connecting the reinforcing bead 70 and the side edge portion 71 to the peripheral edge portion 68, respectively.

  On the other hand, the rigidity of the side sill extension 4 is enhanced by forming the recess 49 and providing the reinforcing beads 56 and 57. In particular, since the reinforcing beads 57 are arranged so as to straddle the corner ridges 53, the effect of increasing the rigidity is great. Further, the rigidity of the side sill extension 4 is also achieved by connecting the rear end portion of the side sill extension 4 to the side sill outer panel 5 forming the vehicle outer side wall portion of the side sill 2 by an end plate 61 that closes the rear end of the side sill 2. Has been enhanced. In particular, in the portion where the bearing hole 63 is formed, the steel plate is doubled by the concave side wall portion 52 of the side sill extension 4 and the flange portion 62 of the end plate 61, and the support rigidity of the support shaft 75 is enhanced. .

  Further, with the bracket 65 being welded to the vehicle interior side wall 41 of the side sill extension 4, as shown in FIG. 10, the reinforcing bead 70 of the bracket 65 and the reinforcing bead 57 of the side sill extension 4 form a plurality of closed cross sections. Therefore, the rigidity of the bracket 65 and the side sill extension 4 is increased.

  As described above, in the trailing arm support structure of the present embodiment, the rigidity of the bracket 65 and the side sill extension 4 is enhanced by the various structures described above, so that the bracket 65 can be reduced in size, weight, and thickness. .

  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. In particular, the location of the reinforcing beads 56, 57, and 70 can be changed as appropriate.

  DESCRIPTION OF SYMBOLS 1 ... Vehicle body, 2 ... Side sill, 3 ... Side sill inner panel, 4 ... Side sill extension, 5 ... Side sill outer panel, 6 ... Side sill stiffener, 11 ... Rear frame, 21 ... Rear inner panel, 31 ... Outer panel assembly, 41 ... Car interior side wall Part, 42 ... lower wall part, 43 ... upper wall part, 45 ... corner ridge part, 49 ... recessed part, 51 ... recessed part upper wall part, 52 ... recessed part side wall part, 53 ... corner ridge part, 56 ... reinforcing bead, 57 ... Reinforcement beads (side sill reinforcement beads), 61 ... end plate, 62 ... collar, 63 ... bearing hole, 65 ... bracket, 66 ... bearing hole, 67 ... seat, 68 ... peripheral edge, 69 ... upper edge, 70 ... reinforcement Bead (bracket reinforced bead), 71 ... side edge, 75 ... support shaft, 76 ... bush, 90 ... trailing arm

Claims (5)

In order to support the front end of the trailing arm, a trailing arm support structure provided at the rear end of the side sill extended in the vehicle longitudinal direction on both sides of the vehicle body,
The side sill has a substantially square cross section including an upper wall portion, a vehicle inner wall portion, a lower wall portion, and a vehicle outer wall portion at a front portion, and a rear end portion is formed between the vehicle inner wall portion and the lower wall portion. The corner ridge portion is recessed outward and upward, and is defined by a concave upper wall portion that is continuous with the vehicle inner side wall, and a concave side wall portion that extends from the concave upper wall portion to the lower wall portion. Having a recess
A support shaft that extends downward and faces the recess side wall portion and pivotally supports the front end of the trailing arm is attached to the vehicle inner side surface of the vehicle inner wall portion above the recess. The bracket is joined,
The bracket has a receiving seat facing the front end of the trailing arm around a portion to which the support shaft is attached, and extends from an edge of the receiving seat to a joint portion with the vehicle interior side wall. It has a plurality of bracket reinforcement beads that are convex on the side opposite to the side,
The side sill has a side sill reinforcing bead that extends from the inner wall portion of the vehicle above the concave portion to the upper wall portion of the concave portion and is convex on the side opposite to the bracket and on the side opposite to the concave portion side. Trailing arm support structure.   2. The trailing arm support according to claim 1, wherein each of the bracket reinforcing beads is disposed at a distance from each other, and the bracket is welded to the inner wall of the vehicle between adjacent bracket reinforcing beads. Construction.   Each of the bracket reinforcing beads and each of the portions of the side sill reinforcing beads provided on the inner side wall of the side sill are arranged so as to face each other, and provided on the inner side wall of the bracket reinforcing bead and the side sill reinforcing bead. The trailing arm support structure according to claim 1, wherein a closed section is formed by the formed portion.   4. The trailing arm according to claim 1, wherein the seat has a disk shape and bulges toward the side wall of the concave portion at a peripheral edge thereof. 5. Support structure.   The rear end of the recess side wall is connected to the vehicle outer wall by a lid member that closes the rear end of the side sill except for the recess. The trailing arm support structure according to one item.

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