JP2020001674A - Lower vehicle-body structure of vehicle - Google Patents

Abstract

To provide a lower vehicle-body structure of a vehicle capable of improving the support stiffness of a suspension supporting portion and contributing to the reduction of floor vibration.SOLUTION: Arm front-end supporting portions 20, each supporting a front end portion 12 of a trailing arm 11 of a rear suspension 10, are formed on lower portions of rear frames 6 extending in a vehicle longitudinal direction, and each arm front-end supporting portion 20 includes a U-shape portion 21 including an outer wall portion 30r, an inner wall portion 23 and a front wall portion 24 with a rear side being open when viewed from the bottom. The arm front-end supporting portion 20 has thereon forming an extending outer wall portion 30f extending from the outer wall portion 30r to a front side of the front wall portion 24. These outer wall portion 30r and extending outer wall portion 30f are formed by a side sill inner 3a joined to each rear side frame 6. Also, each arm front-end supporting portion includes an extending inner wall portion 40 extending from the inner wall portion 23 to the front side of the front wall portion 24 and joined to the rear side frame 6.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a rear suspension, and more particularly to a lower body structure of a vehicle in which a front end of an arm of a torsion beam type suspension is supported below a rear floor constituting a surface extending in a vehicle longitudinal direction and a vehicle width direction.

  The front end of the rear suspension, in particular, the torsion beam type suspension is supported below the rear suspension by a support mechanism (40) between the left and right vertical surfaces (31) and (32). There is known a configuration provided in an arm support bracket (30) that supports the arm (see, for example, Patent Document 1).

  The arm support bracket (30) is formed in a U-shape whose rear end is open when viewed from below by bridging the front ends of the vertical surfaces (31) and (32) in the vehicle width direction with a reinforcing member (35). With this configuration, it is possible to improve the support rigidity of the front end of the arm, particularly the lateral rigidity, that is, the rigidity against lateral (vehicle width) vibration input from the arm to the vehicle body via the arm support bracket (30). It can be expected to improve the straight running stability at the time.

  On the other hand, the vibration in the vehicle front-rear direction and the vertical direction input from the arm through the arm support bracket (30) causes noise due to floor vibration, and hitherto a reinforcing bead or patch is applied to the vibrating portion. As with the lateral vibrations, the vibration input amount itself is also reduced by the arm support bracket (30) close to the vibration input point to the vehicle body, as with the lateral vibrations and the vertical vibrations. It is considered more preferable to do so.

  Patent Literature 1 does not disclose such an idea at all, and in addition to further improving the support rigidity of the suspension support portion, among the vibrations input from the vibration input point to the vehicle body, particularly in the vehicle longitudinal direction and the vertical direction There is room for improvement in the reduction of floor vibrations due to the reduction in the vibration input amount of.

JP 2007-283888 A

  The present invention has been made in view of such a problem, and an object of the present invention is to provide a lower vehicle body structure of a vehicle that can improve the support rigidity of a suspension support portion and contribute to a reduction in floor vibration.

  According to the present invention, an arm front end support portion for supporting a trailing arm front end of a rear suspension is formed at a lower portion of a left and right rear frame which forms a closed cross section extending in a vehicle front-rear direction. A lower body structure of a vehicle having a U-shaped portion whose rear wall is open when viewed from the bottom with an outer wall portion, an inner wall portion in a vehicle width direction inner side, and a front wall portion, wherein the arm front end support portion includes the outer wall portion And an extended outer wall portion extending forward from the front wall portion, and the outer wall portion and the extended outer wall portion are constituted by side sill inners joined to the rear frame, while the inner wall is And an extended inner wall portion extending forward from the front wall portion and joined to the rear frame.

  According to the above configuration, the support rigidity of the arm front end support portion (suspension support portion) can be improved. As a result, the vibration (load) at the arm front end support portion as an input source of the vibration (load) input to the vehicle body from the rear wheels via the rear suspension can be reduced, which can contribute to floor vibration reduction. .

  As an aspect of the present invention, the inner wall portion is formed of a first gusset member, the front wall portion is formed of a second gusset member, and the first gusset member includes the extended inner wall portion. And are integrally formed.

  According to the above configuration, the support rigidity of the arm front end support portion in the vehicle front-rear direction can be further improved.

  As an aspect of the present invention, a first gusset reinforcing bead is formed from the inner wall portion of the first gusset member to the extended inner wall portion.

  According to the configuration, the rigidity between the inner wall portion and the extended inner wall portion of the first gusset member can be improved.

  As an aspect of the present invention, a lower end of the first gusset member is provided with a first gusset reinforcing flange portion that is bent outward in the vehicle width direction from the inner wall portion to the extended inner wall portion.

  According to the configuration, by providing the first gusset member with the first gusset reinforcing flange at the lower end from the inner wall to the extended inner wall, the rigidity of the first gusset member can be improved.

  As an aspect of the present invention, the extended inner wall portion is formed by a gusset member formed of a member different from the inner wall portion.

  According to the above configuration, the stiffness of the arm front end support portion (suspension support portion) is improved by the gusset member and the extended outer wall portion formed of the side sill inner, and particularly the vehicle vertical direction from the vibration input source and the vehicle. Floor vibration can be effectively reduced by reducing the amount of vibration input to the vehicle body in the front-rear direction.

  As an aspect of the present invention, the gusset member includes an inner wall extending portion extending forward from the inner wall portion, and a front wall extending portion extending forward from the front wall portion and continuous with the inner wall extending portion via a ridge line. It is something.

  According to the above configuration, the rigidity of the entire gusset member can be improved by forming the gusset member into a shape including the ridge line.

  As an embodiment of the present invention, the gusset member includes a reinforcing flange portion bent downward from an outer end in the vehicle width direction of the front wall extension portion.

  According to the above configuration, the rigidity of the front wall extension can be improved by forming the reinforcing flange that is bent downward from the outer end of the front wall extension on the front wall extension of the gusset member.

  As an aspect of the present invention, the gusset member includes a reinforcing bead extending from the inner wall to the rear frame at the inner wall extension.

  According to the above configuration, by forming the inner wall extension of the gusset member with the reinforcing bead, the rigidity of the inner wall extension can be improved.

  As an aspect of the present invention, a rear frame rain is provided in the rear frame, and the rear frame rain includes a rain lower wall inner portion disposed inside a lower wall of the rear frame in a vehicle width direction; A lower portion of the rain inner wall disposed at the lower portion, wherein the inner wall extending portion sandwiches the rear frame together with the lower portion of the rain inner wall, and the front wall extending portion sandwiches the rear frame together with the inner portion of the lower rain wall. Are joined together as follows.

  According to the above configuration, the rigidity of the joint between the gusset member and the rear frame can be improved by the rear frame rain.

  As an aspect of the present invention, a joint member is provided in the rear frame at a position near the front of the gusset member.

  According to the above configuration, the space between the gusset member and the side sill can be reinforced by the joint member.

  According to the present invention, the support rigidity of the suspension support portion can be improved, and it can contribute to a reduction in floor vibration.

FIG. 2 is a perspective view showing a main part of a lower vehicle body structure on the right side of the vehicle according to the embodiment, as viewed from below and from the center in the vehicle width direction. FIG. 2 is a bottom view showing a main part of the lower vehicle body structure of the embodiment. The principal part enlarged view of FIG. FIG. 3 is a sectional view taken along the line AA in FIG. 2. Sectional drawing along the BB line of FIG. Arrow sectional drawing along the DD line of FIG. FIG. 5A is a cross-sectional view taken along the line EE in FIG. 4, and FIG. 5B is a cross-sectional view taken along the line FF in FIG. FIG. 3 is a sectional view taken along the line CC of FIG. 2. FIG. 10 is a perspective view showing a main part of a lower vehicle body structure on the right side of the vehicle according to another embodiment, as viewed from below and from the center in the vehicle width direction. The bottom view showing the important section of the lower body structure of other embodiments. Sectional drawing along the BB line of FIG. FIG. 3 is a sectional view taken along the line AA in FIG. 2. FIG. 3 is a sectional view taken along the line CC of FIG. 2.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
In the figure, the arrow F indicates the front of the vehicle, the arrow R indicates the right side of the vehicle, the arrow L indicates the left side of the vehicle, and the arrow U indicates the upper side of the vehicle. Also, for the left side of the vehicle in FIG. 2, the illustration of the rear suspension and the rear wheel house is omitted, and in FIG. 4 and FIG. 12, the inner wall portions of the rear frame upper and the rear frame lower are indicated by phantom lines. It shall be illustrated. In addition, “x” marks in the figure indicate spot welded portions, and the lower vehicle body structure of the vehicle of the present embodiment is a symmetrical shape, so that it will be described based on the configuration on the right side of the vehicle unless otherwise indicated. I do.

  In the lower vehicle body structure of the vehicle according to the present embodiment, a floor panel 1 (see FIG. 2) that forms a floor surface of a vehicle compartment is provided, and the floor panel 1 projects into the vehicle interior at a substantially central portion in the vehicle width direction. A tunnel portion 2 extending in the front-rear direction (see FIG. 1) is integrally formed.

  As shown in FIGS. 1 and 2, side sills 3 as vehicle body strength members are joined and fixed to both sides of the floor panel 1. The side sill 3 shows a cross section orthogonal to the vehicle front-rear direction. For example, as shown in FIG. 7A, the side sill 3 includes a side sill inner 3a and a side sill rain 3b, and has a closed cross section extending in the vehicle front-rear direction. A side sill outer 3c as a design panel forming a part of the body side is joined to 3b from the outside in the vehicle width direction.

  A pair of left and right floor frames 19 extending in the vehicle front-rear direction is fixedly connected to the lower surface of the floor panel 1 between the tunnel portion 2 and the side sill 3.

  As shown in FIGS. 1 and 2, a rear floor panel 5 constituting a rear floor of a vehicle body is integrally connected to a rear portion of the above-mentioned floor panel 1 via a kick-up portion 4 which rises upward. On both sides of the rear floor panel 5, rear side frames 6 extending in the vehicle front-rear direction are provided.

  A front portion 5F of the rear floor panel 5 (hereinafter, referred to as a "rear floor front portion 5F") constitutes a bottom surface of the rear seat, and as shown in FIGS. The rear floor rear portion 5R ") constitutes a luggage compartment floor, and a concave portion 5a which also serves as a spare tire pan or other parts which is recessed downward is integrally formed at a middle portion in the vehicle width direction.

  As shown in FIGS. 1 and 2, a rear cross member 8 that bridges a pair of left and right rear side frames 6 in the vehicle width direction is disposed on each of the upper and lower sides of the rear floor panel 5.

  Specifically, a front rear cross member 8f extending in the vehicle width direction and connecting the rear side frames 6 on both sides in the vehicle width direction is joined and fixed to the front of the rear floor front portion 5F from the lower surface side of the rear floor front portion 5F. I have.

  A rear cross member upper (not shown) and a rear cross member lower 8md (see FIGS. 1 and 2) are provided at the upper and lower portions of the rear floor panel 5 at the boundary between the rear floor front portion 5F and the rear floor rear portion 5R. Each is fixedly joined by spot welding or the like. Each of these is an intermediate rear cross member 8m (so-called No. 4 cross member) extending in the vehicle width direction and connecting the rear side frames 6 on both sides in the vehicle width direction. , And between the rear cross member lower 8 md and the rear floor panel 5, a closed cross section that overlaps in the vertical direction is formed.

  Further, as shown in FIG. 1, a rear rear cross member 8r extends in the vehicle width direction so as to cross the recess 5a of the rear floor rear portion 5R and connects the rear side frames 6 on both sides in the vehicle width direction. (A so-called No. 4.5 cross member) is joined and fixed from the lower surface side of the rear floor rear portion 5R. A closed cross section extending in the vehicle width direction is formed between the rear rear cross member 8r and the rear floor panel 5.

  As shown in FIGS. 1 and 2, a rear wheel house 7 is provided outside the rear side frame 6 in the vehicle width direction (only the right side of the vehicle is shown). The rear wheel house 7 is configured by joining a rear wheel house outer 7b and a rear wheel house inner 7a.

  The rear portion of the side sill 3 extends until it reaches the front portion of the rear wheel house 7 disposed further rearward than the position corresponding to the rear end of the floor panel 1, and the rear ends of the side sill inner 3a and the side sill rain 3b are It is joined to the front of the rear wheel house inner 7a.

  That is, the rear portion of the side sill 3 and the rear wheel house 7 are disposed adjacent to the rear side frame 6 on the outer side in the vehicle width direction.

  As shown in FIGS. 4 to 6, FIGS. 7A, 7 </ b> B, and 8, the above-described rear side frame 6 has a closed cross section extending in the vehicle front-rear direction from the kick-up portion 4 to the rear end of the rear floor panel 5. 60 s is formed as a vehicle body side rigid member having the rear floor side panel 61 (also referred to as a “rear side frame upper 61”) and disposed below the rear floor side panel 61 over the entire longitudinal direction of the vehicle. A rear side frame lower 62 and the like are provided.

  The rear floor side panel 61 is a panel that forms the upper surface of the rear side frame 6 and also forms both sides of the rear floor panel 5 (see FIG. 1).

  As shown in FIGS. 6, 7 (a), (b), and 8, the rear side frame lower 62 is a vehicle extending in the up-down direction while being inclined downward to the outside in the vehicle width direction on the inner side in the vehicle width direction of the rear side frame 6. The width inner wall (6a) is integrally formed with a lower wall (6c) extending substantially horizontally outward from the lower end of the vehicle width inner wall (6a) in the vehicle width direction. The lower wall portion (6c) forms a vehicle width inner wall portion 6a and a lower wall portion 6c of the rear side frame 6, respectively.

  In this example, as shown in FIGS. 6, 7 (a) and 7 (b), the rear side frame lower 62 further includes a rear side frame lower upper component 62u and a rear side frame lower lower part. The vehicle width inner wall portion 6a of the rear side frame 6 is composed of the lower side rear frame lower member 62d and the vehicle width inner wall portion of the lower rear side frame lower member 62d. You.

  The above-mentioned rear floor side panel 61 and rear side frame lower 62 are formed with joining flange portions 61a, 62a at inner ends in the vehicle width direction, respectively (see FIGS. 6, 7 (a), (b) and 8). The outer flange 5ca of the vehicle width direction center portion 5c of the rear floor panel 5, which is located on the inner side in the vehicle width direction from the rear floor side panel 61, is sandwiched by the joining flange portions 61a, 62a for spot welding or the like. (See FIG. 2).

  The rear floor side panel 61 and the rear side frame lower 62 are also formed with joining flanges 61b, 62b at the outer ends in the vehicle width direction, respectively, and these joining flanges 61b, 62b are wider than the rear side frame 6. It is joined to the inner panel of the vehicle body component arranged outside in the direction.

  In this example, the joining flange portions 61b and 62b are joined to the side sill inner 3a as the inner panel of the vehicle body part at a portion corresponding to the side sill 3 in the vehicle front-rear direction of the rear side frame 6 (FIG. 7A). b)), at a portion corresponding to the rear wheel house 7, it is joined to a rear wheel house inner 7a as the inner panel of the vehicle body component.

  Thus, the rear side frame 6 has a closed cross section 60 s extending in the vehicle front-rear direction between the rear floor side panel 61 and the rear side frame lower 62 and the inner panel of the vehicle body component disposed outside in the width direction.

As shown in FIG. 1, the rear side frame 6 is joined to the rear end of the above-mentioned floor frame 19, the front end of which is joined and fixed to the lower surface of the floor panel 1, and corresponds to the rear floor front portion 5F in the vehicle longitudinal direction. As shown in FIGS. 1 and 2, the front part is formed as an inclined part 6 s that is inclined upward and extends rearward, and the rear part corresponding to the rear floor rear part 5 </ b> R is substantially horizontally linearly formed in the vehicle rear direction. It is configured as a linear portion 6f extending.
As shown in FIG. 1, the inclined portion 6 s is inclined upward from the front end to the rear corresponding to the rising height of the kick-up portion 4.

  As shown in FIG. 2, the rear wheel house 7 (shown only on the right side of the vehicle) is disposed in the vehicle front-rear direction from the rear portion of the inclined portion 6s of the rear side frame 6 to the straight portion 6f, and at the front of the inclined portion 6s. The rear portion of the inclined portion 6s extends in such a manner as to incline so as to detour the rear wheel house 7 inward in the vehicle width direction. The portion 6f extends linearly rearward of the vehicle from the rear end of the inclined portion 6s.

  As shown in FIG. 1, the inclined portion 6 s is arranged so that the rear floor front portion 5 </ b> F is located above the floor panel 1 via the kick-up portion 4, so that the front portion 5 </ b> F is located forward with respect to the rear floor front portion 5 </ b> F. It is formed to project downward. Thus, the lower portion of the inclined portion 6s below the lower surface of the rear floor front portion 5F is erected with respect to the rear floor front portion 5F so that the vehicle width inner wall portion 6a of the inclined portion 6s becomes a vertical wall shape.

  Thus, below the rear floor front portion 5F, the inclined portions 6s of the pair of right and left rear side frames 6, which protrude below the lower surface of the rear floor front portion 5F, and the front rear cross member 8f (the kick-up portion 4). The intermediate rear cross member 8m forms a space 9s surrounded by the vehicle bottom view, and at least the upper portion of the fuel tank 9 is stored in the space 9s (see FIG. 2). The fuel tank 9 is supported on the vehicle body side using a pair of left and right tank bands 9a and 9b (see FIG. 1). In this example, the front portions of the tank bands 9a, 9b are fastened and fixed to the front rear cross member 8f, and the rear portions of the tank bands 9a, 9b are fastened and fixed to the intermediate rear cross member 8m.

On the other hand, the rear portion of the side sill 3 extends horizontally in the vehicle front-rear direction so that the lower surface thereof maintains substantially the same height as the lower surface of the floor panel 1, as shown in FIG.
As a result, as shown in the figure, the rear portion of the side sill 3 disposed adjacent to the inclined portion 6s on the outer side in the vehicle width direction projects downward with respect to the lower surface of the inclined portion 6s inclined upward toward the rear. The vehicle width inner wall portion 30 (hereinafter, referred to as a “side sill kick-up portion 30”) of the downwardly projecting portion is erected downwardly in a vertical wall shape with respect to the lower surface of the inclined portion 6 s.

  In this example, the side sill kick-up portion 30 is formed so that the length of the downwardly protruding portion becomes longer toward the rear side in accordance with the shape of the inclined portion 6s which is inclined upward toward the rear side with respect to the rear floor front portion 5F. I have.

  As shown in FIGS. 1 and 2, the rear suspension 10 (only the right side of the vehicle is shown) of the present embodiment is a torsion beam type suspension, and a trailing arm 11 provided on the rear suspension 10 has a front end 12 The arm front end is provided below the inclined portion 6s of the rear side frame 6 via the shaft member 13 (see FIG. 8) so that the rear part swings up and down around the arm front end portion 12 (hereinafter referred to as the "arm front end portion 12"). It is supported by the support 20.

  Here, reference numeral 14 in FIGS. 1 and 2 denotes a torsion bar having a U-shaped cross section for connecting the left and right (only the right side of the vehicle is shown) trailing arms 11, and similarly, reference numeral 15 denotes a torsion bar 14; Reference numeral 16 denotes a plate-shaped spring lower end receiving member in which a flat spring lower end receiving surface (not shown) is formed upward at a corner portion between the trailing arm 11 and a portion behind the torsion bar 14. Shows a spring upper end receiving member joined to the lower surface of the rear side frame 6 above the spring lower end receiving member 15 with the flat spring upper end receiving surface 16a facing downward. It should be noted that illustration of a damper or the like that is interposed between the upper end of the rear wheel house 7 and the rear end of the trailing arm 11 and that can expand and contract in the vertical direction is omitted.

As shown in FIG. 8, a supported structure 120 that is supported by the arm front end support portion 20 via a bolt 131 and a nut 132 as the shaft member 13 is formed at the arm front end portion 12.
As shown in FIG. 8, the supported structure 120 has an inner cylinder 121 inserted through the shaft member 13, a rubber member 122 surrounding the inner cylinder 121, and an outer cylinder 123 provided on the outer periphery of the rubber member 122. It is composed.

  As shown in FIG. 3, the arm front end support portion 20 surrounds the inner and outer sides and the front side in the vehicle width direction with respect to the arm front end portion 12, and is disposed in a U-shape as viewed from the lower side of the vehicle. A U-shaped portion 21 (also referred to as an “arm front end support main body portion 21”) is provided.

  The U-shaped portion 21 includes a vehicle width inner wall portion 23 and a vehicle width outer wall portion 30r which are disposed in a vertical wall shape on the inner and outer sides in the vehicle width direction with respect to the arm front end portion 12, and a front side with respect to the arm front end portion 12. The front wall portion 24 bridges the vehicle width outer wall portion 30r and the vehicle width inner wall portion 23 in the vehicle width direction.

  As shown in FIG. 8, the vehicle width inner wall portion 23 and the vehicle width outer wall portion 30r are formed with through holes 23h and 3h, respectively, through which the shaft member 13 is inserted, and are formed by the peripheral edges of the through holes 23h and 3h. The arm front end portion 12 is pivotally supported via a shaft member 13 bridged between the inner and outer wall portions 23 and 30r.

  The tip of the bolt 131 as the shaft member 13 is fastened by a nut 132. The fastening portion between the tip of the bolt 131 and the nut 132 corresponds to a protruding portion that protrudes from the vehicle width inner wall portion 23 toward the fuel tank 9. The nut cap 133 made of an elastic member such as rubber is used for the fuel tank 9. Seen from the side (see FIG. 8).

  As shown in FIG. 3, the vehicle width inner wall portion 23 forms a surface extending in the vehicle front-rear direction below the lower surface of the rear side frame 6, and has a linearly extending upper end at an upper end thereof above the lower surface of the rear side frame 6. The joining flange portion 23a that joins to the vehicle width inner wall portion 6a of the rear side frame 6 is integrally formed.

  As shown in FIGS. 3 to 5, the front wall portion 24 forms a surface extending in the vehicle width direction below the lower surface of the rear side frame 6, and has an upper end at the upper end thereof so as to be joined to the lower surface of the rear side frame 6 so as to be able to be joined to the front of the vehicle. The extending joining flange portion 24a is integrally bent.

  Further, as shown in FIG. 3, the front wall portion 24 is integrally formed with a joint flange portion 24b extending forward of the vehicle so as to be joined to the side sill kick-up portion 30 of the side sill inner 3a at the outer end in the vehicle width direction. Have been.

  The vehicle width outer wall portion 30r is located on the rear side of the front wall portion 24 in the vehicle front-rear direction of the side sill kick-up portion 30, in other words, with respect to the vehicle width inner wall portion 23, across the arm front end portion 12 in the vehicle width direction. It is formed in a facing portion facing outside.

  Further, the vehicle width inner wall portion 23 and the front wall portion 24 are integrally formed by an arm front end support bracket 25 made of one member.

  In the arm front end support bracket 25, the front end of the vehicle width inner wall portion 23 and the vehicle width direction inner end of the front wall portion 24 are integrally connected, and a ridge line 25a (bent portion) extending mainly in the vertical direction is interposed therebetween. The ridgeline 25a is formed of a single steel material so that the cross section (orthogonal cross section) in the direction perpendicular to the extending direction of the ridgeline 25a is continuous. That is, the vehicle width inner wall portion 23 and the front wall portion 24 are disposed at substantially right angles, and the arm front end support bracket 25 is formed in a substantially L-shape when viewed from the bottom of the vehicle.

  As shown in FIGS. 3 and 8, in addition to the U-shaped portion 21, a brace member 80, a reinforcing member 90, an extended vehicle width outer wall portion 30 f and a gusset member 40 And

  As shown in FIGS. 3 and 8, the brace member 80 includes a reinforcing member 90 disposed below the arm front end portion 12 and adjacent to the vehicle width inner wall portion 23 of the U-shaped portion 21 and a lower surface of the side sill inner 3a. This prevents the opening of the U-shaped portion 21 which is bridged to and opened downward.

  As shown in FIGS. 2, 3, and 8, the reinforcing member 90 is a member that serves both to support the brace member 80 and to reinforce the U-shaped portion 21, particularly, the vehicle width inner wall portion 23. On the other hand, it is disposed adjacent to the vehicle width direction outer side (arm front end portion 12 side) so as to substantially overlap in a vehicle side view.

  As shown in FIGS. 2, 3, and 8, the reinforcing member 90 is a member that serves both to support the brace member 80 and to reinforce the U-shaped portion 21, particularly, the vehicle width inner wall portion 23. On the other hand, it is disposed adjacent to the vehicle width direction outer side (arm front end portion 12 side) so as to substantially overlap in a vehicle side view.

  As shown in FIG. 8, the brace member 80 has an inner end in the vehicle width direction corresponding to the arm front end 12 in the reinforcing member 90 when viewed from the side of the vehicle, by a brace attachment portion 81 including a bolt 81 a and a nut 81 b. It is fastened and fixed below.

  Specifically, as shown in FIGS. 3 and 4, the inner end in the vehicle width direction of the brace member 80 corresponds to a corner between the lower edge and the rear edge of the inner wall portion 23 of the reinforcing member 90 in the vehicle side view. Are mounted via bolts 81a and nuts 81b.

  As shown in FIG. 8, in a brace mounting portion 81 of the reinforcing member 90 corresponding to a mounting position of an inner end in the vehicle width direction of the brace member 80, a tip end portion of a bolt 81a is fastened to a nut 81b. The portion is disposed so as to protrude from the reinforcing member 90 to the fuel tank 9 provided on the inner side in the vehicle width direction.

  As shown in FIGS. 3, 4, and 8, the corners of the vehicle width inner wall 23 are reinforced to secure an arrangement space for the bolt 81 a and the nut 81 b in the brace attachment portion 81. A covering portion 42c which bulges inward in the vehicle width direction corresponding to the length of the member 90 projecting inward in the vehicle width direction, and covers a fastening portion of the brace attachment portion 81 from the fuel tank 9 side in a vehicle side view. It is provided as.

  As shown in FIG. 3, the gusset member 40 and the extended vehicle width outer wall portion 30 f are both extended forward with respect to the front wall portion 24 of the U-shaped portion 21, and each has a vehicle width below the rear side frame 6. In each of the inner and outer sides in the direction, the front wall portion 24 and the lower surface of the rear side frame 6 extend therebetween so as to bridge therebetween.

  Specifically, as shown in FIG. 3, the extended vehicle width outer wall portion 30f is a portion of the side sill kick-up portion 30 of the side sill inner 3a on the front side of the front wall portion 24, in other words, an inner wall extension of the gusset member 40, which will be described later. It is formed in a vertical wall shape at a portion facing the protrusion 41 (see FIG. 7B). As shown in FIG. 3 and FIG. 6, the extension flange portion 24 b of the front wall portion 24 is joined to the rear end of the extension vehicle width outer wall portion 30. The portions 62b are joined (see FIGS. 5 to 7 (a) and (b)), and extend in the up-down direction and the front-rear direction between the joining flange portions 24b and 62b so as to bridge the joining flange portions 24b and 62b.

  As shown in FIG. 3, the gusset member 40 extends upward from the front lower portion of the vehicle width inner wall portion 23 of the U-shaped portion 21 to the front upper side, and is joined to the vehicle width direction inner lower portion of the rear side frame 6. An inner wall extending portion 41 extending forward and upward from the vehicle width inner wall portion 23 and a front wall extending portion 42 extending forward and upward from the front wall portion 24 are provided.

  In the gusset member 40, the front lower end of the inner wall extension 41 and the vehicle width direction inner end of the front wall extension 42 are integrally connected via a ridge line 40a (bent portion), and the gusset member 40 extends in the extending direction of the ridge line 40a. It is formed of one steel material so that orthogonal cross sections orthogonal to each other are continuous. The inner wall extension 41 and the front wall extension 42 are disposed substantially at right angles. The ridge 40a extends continuously from the rear lower end to the front upper end of the gusset member 40 between the inner wall extension 41 and the front wall extension 42.

  The inner wall extending portion 41 is integrally formed with a rear lower end joining flange portion 41a extending rearward from the front wall portion 24 so as to be joined to the vehicle width inner wall portion 23 at the rear lower end, and a rear side at the front upper end. A front upper end joining flange portion 41b extending upward from the lower surface of the rear side frame 6 is formed integrally with the vehicle width inner wall portion 6a of the frame 6 so as to be joined thereto.

  The front wall extension portion 42 has a rear lower end joining flange portion 42a that extends downward so as to be joined to the front wall portion 24 at the rear lower end and is integrally formed with the front lower end of the rear side frame 6 at the front upper end. A front upper end joining flange portion 42b extending forward so as to be joined to the lower wall portion 6c) is bent integrally.

  In the gusset member 40, the rear lower end joining flange portions 41 a and 42 a of the inner wall extending portion 41 and the front wall extending portion 42 are formed by the front lower portion of the vehicle width inner wall portion 23 of the U-shaped portion 21 and the front wall portion 24. The front upper end joining flange portions 41b and 42b of the inner wall extending portion 41 and the front wall extending portion 42 are respectively joined to the lower portion in the width direction inner side and the front wall portion 24 of the U-shaped portion 21 in the inclined portion 6s. Are respectively joined to the front position with an interval.

  Thereby, the gusset member 40 extends so as to surround the corner portion between the front wall portion 24 and the lower surface of the rear side frame 6 located on the front side with respect to the front wall portion 24 from below and forwardly when viewed from the side of the vehicle. I have.

  The inner wall extending portion 41 is formed to be substantially the same surface shape through the vehicle width inner wall portion 23 and the vehicle width inner wall portion 6a of the rear side frame 6, and connects the rear lower end joining flange portion 41a and the front upper end joining flange portion 41b. A reinforcing bead 43 extending so as to be connected is provided.

  The reinforcing bead 43 is formed so that a part of the inner wall extending portion 41 is protruded inward in the vehicle width direction with respect to the periphery. Further, the reinforcing bead 43 extends in an arch shape so that the intermediate portion detours forward and downward as viewed from the side of the vehicle upward from the front end (base end) side of the rear lower end joining flange portion 41a to the front. The front upper end continuously extends until reaching the lower end (front end) side of the front upper end joining flange portion 41b at an intermediate position of the front upper end joining flange portion 41b in the vehicle front-rear direction.

  The gusset member 40 includes a reinforcing flange portion 44 that is formed to protrude downward by bending the outer end of the front wall extension portion 42 downward.

  The reinforcing flange portion 44 is continuously formed between the front wall extension portion 42 including the rear lower end joining flange portion 42a and the front upper end joining flange portion 42b.

  As shown in FIGS. 4 to 8, the rear side frame as a reinforcing member of the rear side frame 6 is provided on the periphery of the rear side frame 6 of the present embodiment in the vehicle front-rear direction, that is, at least a closed section 60 s inside the inclined portion 6 s. The rain 50 and the node members 71, 72, 73 (bulk head) are provided.

  As shown in FIGS. 6 to 8, the rear side frame rain 50 is disposed at the inside corner and on the lower side in the vehicle width direction in the closed cross section 60 s of the rear side frame 6, as shown in FIGS. 4 to 6. And extends along the vehicle front-rear direction from the front part to the rear part of the inclined part 6s.

  As shown in FIG. 6, the rear side frame rain 50 includes a rain lower wall inner portion 51 extending in the vehicle width direction so as to be connectable to a lower wall portion 6 c of the rear side frame 6 from an upper surface thereof, and a vehicle width inner wall portion 6 a of the rear side frame 6. The lower inner wall portion 51 is integrally formed with a lower inner wall portion 52 extending upward from an inner end in the vehicle width direction of the lower inner wall portion 51 so as to be connectable from the outer surface in the vehicle width direction.

  As shown in FIGS. 4 and 6, a plurality of joint members 71, 72, 73 (bulk heads) are arranged at intervals in the vehicle front-rear direction on the inclined portion 6 s of the rear side frame 6. , A front node member 71 disposed at the front of the inclined portion 6s, an intermediate node member 72 disposed behind the front node member 71, and a rear node member disposed behind the intermediate node member 72 73.

  As shown in FIGS. 4 and 5, the front side joint member 71 is located closer to the front of the gusset member 40 in the closed cross section 60 s of the inclined portion 6 s extending along the vehicle front-rear direction. It is arranged at a position that coincides with the front upper end joining flange portion 42b in the vehicle front-rear direction. Further, in this example, as shown in the figure, the intermediate joint member 72 is disposed at a position coinciding with the front wall portion 24 in a closed cross section 60 s of the inclined portion 6 s extending along the vehicle front-rear direction, and at the rear side. The joint member 73 is disposed at a position coinciding with the arm front end 12 in a closed cross section 60 s extending along the vehicle front-rear direction of the inclined portion 6 s.

  As shown in FIGS. 4 to 6, the front-side joint member 71 has a panel-shaped joint main body wall portion 71 a (an orthogonal plane in the vehicle longitudinal direction) that partitions a closed cross section 60 s of the inclined portion 6 s extending in the vehicle longitudinal direction. 5 and 6), a vehicle width outer edge joining flange portion 71b (see FIG. 5) bent and formed to extend forward from the vehicle width direction outer end of the joint body wall portion 71a, and the joint body wall. A vehicle width inner edge joining flange portion 71c (see FIGS. 4 and 6) bent and formed to extend forward from the vehicle width direction inner end of the portion 71a, and extends forward from the lower end of the joint body wall portion 71a. It is integrally formed with the lower edge joining flange 71d (see FIG. 6) bent as described above.

  As shown in the figure, the intermediate joint member 72 includes a panel-shaped joint main body wall 72a (see FIGS. 5 and 6) that forms an orthogonal plane in the vehicle front-rear direction similarly to the front side joint member 71, and the joint main body. A vehicle width outer edge joining flange portion 72b bent and formed to extend forward from the vehicle width direction outer end of the wall portion 72a, and bent so as to extend forward from the vehicle width direction inner end of the joint body wall portion 72a. A formed vehicle width inner edge joining flange portion 72c (see FIGS. 4 and 6), and a lower edge joining flange portion 72d (see FIG. 6) bent and formed so as to extend forward from the lower end of the joint body wall portion 72a. Further, it is integrally formed with an upper edge joining flange portion 72e which is bent and formed so as to extend rearward from the upper end of the node main body wall portion 72a.

  As shown in the figure, the rear side joint member 73 bridges between the side sill inner 3a and the lower wall 6c of the rear side frame 6, and downwards from the front and rear edges of the joint main body wall 73a. It has a front wall 73b (see FIG. 6) and a rear wall 73c (see FIGS. 4 and 5) which extend, and the lower wall of the side sill inner 3a and the rear side frame 6 are provided at the upper and lower edges of the joint body wall 73a. Joint flange portions 73d and 73e are formed to be joined to the portion 6c, respectively. Further, joining flange portions 73f and 73g are formed at the outer ends in the vehicle width direction of the front wall portion 73b and the rear wall portion 73c, and extend to the front and rear sides to join to the side sill inner 3a.

  As shown in FIG. 6, the front side joint member 71 has a vehicle width outer edge joining flange portion 71b joined to the side sill inner 3a from the vehicle width direction inside, and a vehicle width inner edge joining flange portion 71c has a vehicle width of the rear side frame 6. It is joined to the inner wall portion 6a from the outside in the vehicle width direction, and the lower edge joining flange portion 71d is joined to the lower wall portion 6c of the rear side frame 6 from above.

  As shown in FIG. 6, the vehicle width inner edge joining flange portion 71c is joined to the vehicle width inner wall portion 6a of the rear side frame 6 from outside in the vehicle width direction, and a lower portion of the vehicle width inner edge joining flange portion 71c is The rear side frame 6 is joined to the vehicle width inner wall 6a of the rear side frame 6 via the upper portion of the lower portion 52 of the inner wall of the rear frame. That is, the lower portion of the vehicle width inner edge joining flange portion 71c, the upper portion of the rain inner wall lower portion 52 of the rear side frame rain 50, and the vehicle width inner wall portion 6a of the rear side frame 6 are joined by spot welding or the like.

  On the other hand, as shown in the figure, the upper portion of the vehicle width inner edge joining flange portion 71c is directly joined to the vehicle width inner wall portion 6a of the rear side frame 6, and this joining portion is located at the upper portion of the rear side frame lower 62 (car). This corresponds to a joint between an upper component 62u constituting the upper portion of the width inner wall portion 6a) and a lower component 62d constituting the lower portion of the rear side frame 6. That is, the three joint members 62u and 62d on the upper and lower sides of the rear side frame lower 62 are joined to the vehicle width inner edge joint flange portion 71c of the front side joint member 71 by spot welding or the like.

  As shown in FIG. 6, the front upper end joining flange portion 42b of the front wall extension portion 42 of the gusset member 40 is joined to the lower wall portion 6c of the rear side frame 6 from below, and the rear side frame rain 50 The lower wall inner part 51 is joined to the lower wall part 6c of the rear side frame 6 from above. That is, the front flange portion, the lower wall portion 6c of the rear side frame 6, and the rain lower wall inner portion 51 cooperate with the front upper end joining flange portion 42b and the rain lower wall inner portion 51 to sandwich the lower wall portion 6c. Are joined by spot welding or the like.

  As shown in FIG. 7A, the front upper end joining flange portion 41b of the inner wall extending portion 41 of the gusset member 40 is joined to the vehicle width inner wall portion 6a of the rear side frame 6 from the vehicle width direction inside, The lower portion 52 of the inner wall of the rear side frame rain 50 is joined to the inner wall portion 23 of the vehicle from the outside in the vehicle width direction. That is, the front upper end joining flange portion 41b, the vehicle width inner wall portion 6a, and the rain inner wall lower side portion 52 sandwich the vehicle width inner wall portion 6a in cooperation with the front upper end joining flange portion 41b and the rain inner wall lower side portion 52. Thus, three sheets are joined by spot welding or the like.

  As shown in FIG. 7B, the intermediate joint member 72 has upper and lower vehicle width outer edge joining flange portions 72b joined to the side sill inner 3a from the vehicle width direction inside. Of these, the lower vehicle width outer edge joint flange portion 72b is joined to the side sill inner 3a via a joint width portion 62b of the rear side frame lower 62 in the vehicle width direction outside.

  That is, the lower vehicle width outer edge joining flange portion 72b on the lower side of the intermediate joint member 72, the vehicle width inner wall portion of the side sill inner 3a, and the joining flange portion 62b are joined by spot welding or the like.

  Further, as shown in FIG. 7B, the intermediate joint member 72 has a lower edge joining flange portion 72d joined to the lower wall portion 6c of the rear side frame 6 from above. On the other hand, at this joint, the joint flange 24a of the front wall 24 provided on the U-shaped portion 21 is joined to the lower wall 6c of the rear side frame 6 from below. That is, the lower edge joining flange portion 72d, the lower wall portion 6c, and the joining flange portion 24a are joined by spot welding or the like.

  Further, as shown in the figure, the intermediate joint member 72 has a vehicle width inner edge joining flange portion 72c joined to the vehicle width inner wall portion 6a of the rear side frame 6 from the vehicle width direction outside. On the other hand, at this joint, the lower part 52 of the rain inner wall of the rear side frame rain 50 is bonded to the vehicle width inner wall part 6a of the rear side frame 6 from outside in the vehicle width direction. The side part 52 and the vehicle width inner wall part 6a are joined by spot welding or the like.

  As shown in FIG. 6, the upper edge joining flange portion 72e of the intermediate node member 72 is joined to the rear floor side panel 61 from below.

  As shown in FIGS. 1 and 2, the lower vehicle body structure of the vehicle according to the present embodiment described above has a left and right rear side frame 6 (rear frame) forming a closed section 60 s (see FIGS. 4 to 8) extending in the vehicle front-rear direction. ), An arm front end support portion 20 for supporting an arm front end portion 12 as a front end of the trailing arm 11 of the rear suspension 10 is provided. The arm front end support portion 20 has a vehicle width outer wall portion 30r on the outside in the vehicle width direction. A lower vehicle body structure of a vehicle having a U-shaped portion 21 whose rear is open when viewed from the bottom with an (outer wall), a vehicle width inner wall 23 (inner wall) inside the vehicle width direction, and a front wall 24, The arm front end support portion 20 has an extended vehicle width outer wall portion 30f (extended outer wall portion) formed forward of the front wall portion 24 (see FIGS. 1 to 3), and has the vehicle width outer wall portion 30r and the extended vehicle width outer wall portion 30r. Departure width outer wall 30f is It comprises a side sill inner 3a joined to the frame 6 from the outside in the vehicle width direction, and has a gusset member 40 extending forward from the vehicle width inner wall portion 23 to the front wall portion 24 and joined to the rear side frame 6. (Refer especially to FIGS. 1 to 3 and FIG. 3).

  According to the above configuration, the U-shaped portion 21 provided on the arm front end support portion 20 includes, among the vibrations input to the arm front end support portion 20 from the arm front end portion 12 as the vibration input points, particularly the vehicle body in the vehicle width direction. The amount of vibration input to the motor can be effectively reduced.

  Further, in this embodiment, the arm front end support portion 20 includes an extended vehicle width outer wall portion 30f formed by the side sill inner 3a and a gusset member 40, and the extended vehicle width outer wall portion 30f and the gusset member 40 Is joined to the rear side frame 6 as a vehicle body rigid member having a closed cross section 60 s both in the vehicle front-rear direction, and thus the support rigidity of the arm front end portion 12 is determined by the extended vehicle width outer wall portion 30 f and the gusset member 40. Of the vibration input from the vibration input point, in particular, the amount of vibration input to the vehicle body in the vertical direction of the vehicle and the longitudinal direction of the vehicle can be effectively reduced, for example, floor vibration can be effectively reduced. can do.

  Further, in the present embodiment, the vehicle width outer wall portion 30r and the extended vehicle width outer wall portion 30f that form a part of the arm front end support portion 20 are configured by using the side sill inner 3a, so that a highly rigid member is formed. The support rigidity of the front end of the trailing arm 11 can be increased without separately providing.

  As an aspect of the present invention, the gusset member 40 includes an inner wall extending portion 41 extending forward from the vehicle width inner wall portion 23, and a front wall extending forward from the front wall portion 24 and continuous with the inner wall extending portion 41 through the ridge line portion 40a. This is provided with an extension part 42 (see FIGS. 3, 6, 7A and 7B).

  According to the above configuration, the rigidity of the entire gusset member 40 can be improved by forming the gusset member 40 into a shape including the ridge 40a.

  Specifically, a load in the vehicle front-rear direction acts on the arm front end support portion 20 due to, for example, a pulling force acting on the rear wheels (not shown) acting on the rear wheels during traveling. Is formed to include a ridge line portion 40a extending with a vehicle longitudinal direction component, whereby the arm front end support portion 20 can be reinforced particularly against such a load in the vehicle longitudinal direction.

  As an aspect of the present invention, the gusset member 40 is provided with a reinforcing flange portion 44 that is bent downward from the outer end of the front wall extension portion 42 in the vehicle width direction (see FIGS. 3 to 7A and 7B). ).

  According to the above configuration, the rigidity of the front wall extension 42 can be improved by forming the reinforcing flange 44 on the front wall extension 42 of the gusset member 40.

  As an aspect of the present invention, the gusset member 40 is provided with the reinforcing bead 43 on the inner wall extension portion 41 extending from the vehicle width inner wall portion 23 to the front upper end joining flange portion 41b as a joining portion from the rear side frame 6 ( 3 and 4).

  According to the above configuration, by providing the reinforcement bead 43 on the inner wall extension 41 of the gusset member 40, the rigidity of the inner wall extension 41 can be improved.

As an embodiment of the present invention, a closed side section 60s inside the rear side frame 6 is provided with a rear side frame rain 50 (rear frame rain) (see FIGS. 4 to 8). 5 and 6, and a lower portion 52 of the rain inner wall (see FIG. 4) disposed below the vehicle inner wall 6a (inner wall). , See FIG. 6).
The front upper end joining flange 42b of the front wall extension 42 is together with the rain lower wall inner part 51 (see FIG. 6), and the front upper end joining flange 41b of the inner wall extension 41 is together with the rain inner wall lower side 52 (FIG. 7). (Refer to (a)), and are joined so as to sandwich the lower wall portion 6c and the vehicle width inner wall portion 6a of the rear side frame 6, respectively.

  According to the above configuration, the rigidity of the joint between the gusset member 40 and the rear side frame 6 can be improved by the rear side frame rain 50.

  As an aspect of the present invention, a closed section 60s in the rear side frame 6 at a position near the front of the gusset member 40 is provided with a front side joint member 71 (joint member) (see FIGS. 4 to 6).

  According to the above configuration, the space between the gusset member 40 and the side sill 3 can be reinforced by the front side joint member 71. In particular, among the vibrations input from the arm front end portion 12 as the vibration input point to the arm front end support portion 20, it is possible to increase the projecting force of the gusset member 40 particularly against the vibration in the vertical direction of the vehicle.

(Modification of arm front end support)
Subsequently, an arm front end support portion 20A of the second embodiment according to a modification of the arm front end support portion 20 (hereinafter, referred to as “arm front end support portion 20 of the first embodiment”) provided in the above-described lower vehicle body structure of the vehicle. Will be described with reference to FIGS.
However, the same components as those of the arm front end support portion 20 of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  As shown in FIGS. 9 to 12, the arm front end support portion 20A has an extended vehicle width inner wall joined to the inclined portion 6s of the rear side frame 6 forward of the vehicle width inner wall portion 23A of the U-shaped portion 21A. A part 26 is formed. The extended vehicle width inner wall portion 26 is integrally formed with the vehicle width inner wall portion 23A by a first gusset member 27 made of one member, and extends forward from the front wall portion 24A of the first gusset member 27. Part.

  That is, the U-shaped portion 21A of the second embodiment is similar to the U-shaped portion 21 of the first embodiment (see FIG. 3) in that the vehicle width inner wall portion 23A and the front wall portion 24A are formed by ridge lines 25a (bent portions). 9), the vehicle width inner wall portion 23A is formed by the first gusset member 27, the front wall portion 24A is formed by the second gusset member 28, and the vehicle width inner wall portion 23A is formed by separate members. Make up. Further, the arm front end support portion 20A of the second embodiment does not include the gusset member 40 (see FIG. 3) provided in the arm front end support portion 20 of the first embodiment.

  The extended vehicle width inner wall portion 26 continuously extends forward from the front end of the vehicle width inner wall portion 23A, and substantially the entirety thereof is formed to protrude below the lower surface of the inclined portion 6s of the rear side frame 6.

  As shown in FIGS. 9 and 12, the lower end of the extended vehicle width inner wall portion 26 extends in the vehicle front direction so as to form a continuous smooth ridge line from the lower end of the vehicle width inner wall portion 23A. More specifically, the lower end of the extended vehicle width inner wall portion 26 has a higher lower end in the forward direction so that the projecting length gradually decreases downward from the rear end to the front portion of the extended vehicle width inner wall portion 26 toward the front. It is formed to be inclined.

  The first gusset member 27 is substantially entirely formed of a vehicle width inner wall portion 23A and an extended vehicle width inner wall portion 26, and extends across the front wall portion 24A along the vehicle width direction inner end below the rear side frame 6. It is formed of a steel plate extending in the vehicle longitudinal direction and the vertical direction.

As shown in the figure, the first gusset member 27 has an upper end joining flange portion 27a that can be joined to the rear side frame 6 formed on the entire upper end thereof in the vehicle front-rear direction.
The upper end joining flange portion 27a of the first gusset member 27 is joined to a lower portion of the vehicle width inner wall portion 23A of the rear side frame 6 at a plurality of places in the vehicle front-rear direction by spot welding or the like from the inside in the vehicle width direction (FIG. 12 and 13). In this example, the upper end joining flange portion 27a is joined to the portions corresponding to the vehicle width inner wall portion 23A and the extended vehicle width inner wall portion 26 in the vehicle front-rear direction, respectively, at four locations, for a total of eight locations.

  Here, as shown in FIGS. 9 and 10, the reinforcing member 90 described above is disposed adjacent to the vehicle width inner wall portion 23A of the first gusset member 27 on the outside in the vehicle width direction so as to substantially overlap in a vehicle side view. 9 to 12 and an upper wall portion 92 extending outward from the upper end of the vehicle width inner wall portion 91 in the vehicle width direction and joined to the lower surface of the rear side frame 6. Have been.

  9, 11 and 12, the vehicle width inner wall 23A of the first gusset member 27 and the vehicle width inner wall 91 of the reinforcing member 90 are formed at a plurality of positions by spot welding or the like. It is joined over s1 (eight places in this example).

  Among these joint portions s1, a plurality of joint portions s1f between the vehicle width inner wall portion 23A of the first gusset member 27 and each of the front edges 23Aa, 91a of the vehicle width inner wall portion 91 of the reinforcing member 90 are provided in the vertical direction. (Three places in this example) are formed (see FIGS. 9 and 12).

Further, in the arm front end support portion 20A of this example, as described above, the gusset member 40 of the first embodiment (see FIG. 3) is not provided in front of the U-shaped portion 21A (see FIGS. 9 to 11). Also, the extended vehicle width inner wall portion 26 of the first gusset member 27 is joined to the rear side frame 6 only to the vehicle width inner wall portion 6a (see FIGS. 9 and 12), and the lower wall portion 6c (lower surface) ) Are not joined (see FIG. 9).
Accordingly, in the present embodiment, as shown in FIGS. 11 and 12, the closed section 60s in the rear side frame 6 is provided with the gusset member 40 and the extended vehicle width inner wall section 26 from the lower wall section of the rear side frame 6. It does not include the front node member 71 (see FIGS. 5 and 6) that receives the tension load applied to 6c, but includes only the intermediate node member 72 and the rear node member 73.

  As shown in FIGS. 9 and 12, the first gusset member 27 has a plurality (two in this example) of first gusset reinforcing beads 45 (45u, 45d) arranged at intervals on the upper and lower sides. ing.

  Each of the upper and lower first gusset reinforcing beads 45 is formed so as to protrude inward in the vehicle width direction with respect to the inner surface of the first gusset member 27 in the vehicle width direction (FIG. 13 shows the lower first gusset reinforcing bead). Only the bead 45d is shown) and extends substantially horizontally and linearly in parallel in the vehicle front-rear direction (see FIGS. 9 and 12).

  Among the first gusset reinforcing beads 45 on the upper and lower sides, the lower first gusset reinforcing bead 45d (hereinafter, referred to as “first gusset lower reinforcing bead 45d”) is the upper first gusset reinforcing bead 45u (hereinafter, referred to as “first gusset lower reinforcing bead 45d”). , "The first gusset upper reinforcement bead 45u").

  Specifically, the first gusset lower reinforcement bead 45d straddles the front wall portion 24A in a vehicle side view so that the front end reaches the vehicle width inner wall portion 23A and the rear end reaches the extended vehicle width inner wall portion 26. Is formed.

  In this example, the first gusset upper reinforcement bead 45u extends in the vehicle front-rear direction at the vehicle width inner wall portion 23A to a position corresponding to the front wall portion 24A in the vehicle side view, but is not limited thereto. At least one of the upper and lower first gusset reinforcing beads 45u and 45d may be formed so as to straddle the front wall portion 24A in a vehicle side view.

  As shown in FIGS. 9 to 11 and 13, the first gusset member 27 has a lower end that extends from the rear end of the vehicle width inner wall 23 </ b> A to the front end of the extended vehicle width inner wall 26 in the vehicle width direction. The first gusset reinforcing flange portion 46 that is bent in the direction is formed in a continuous eaves shape.

  As shown in FIGS. 9, 11, and 12, the first gusset reinforcing flange portion 46 formed at the front portion of the extended vehicle width inner wall portion 26 has a top surface on a lower surface of the inclined portion 6 s of the rear side frame 6. It extends along the lower surface of the inclined portion 6s so as to contact the inner end in the width direction (particularly, see FIGS. 11 and 12).

  As shown in FIGS. 9 to 12, the second gusset member 28 is substantially entirely formed of a front wall portion 24 </ b> A, and is formed of a steel plate extending in the vehicle width direction and the vertical direction.

  As shown in FIGS. 11 and 12, the second gusset member 28 has a vehicle width inner edge joining flange portion 28a extending rearward in the vehicle width direction at the vehicle width direction inner end of the front wall portion 24A. It is bent integrally. The vehicle width inner edge joining flange portion 28a is joined to the periphery 91a of the front edge of the vehicle width inner wall portion 91 of the reinforcing member 90 from the outside in the vehicle width direction by spot welding or the like (see the same drawing).

  That is, at the joint s1f described above, the periphery 23Aa of the front edge of the vehicle width inner wall 23A of the first gusset member 27, the periphery 91a of the front edge of the vehicle width inner wall 91 of the reinforcing member 90, and the second gusset member 28 Three pieces are joined to the vehicle width inner edge joining flange 28a of the (front wall 24A) by spot welding or the like (particularly, see FIGS. 9, 11, and 12).

  Further, as shown in FIGS. 9 to 11, the second gusset member 28 extends toward the vehicle front in the vehicle width direction outer end and upper end of the front wall 24 </ b> A, similarly to the front wall 24 of the first embodiment. The joining flange portions 28b and 28c are bent integrally with the front wall portion 24A.

  As shown in FIGS. 10 and 11, of these connecting flange portions 28 b and 28 c, the outer end connecting flange portion 28 b in the vehicle width direction is connected to the extended vehicle width outer wall portion 30 f of the side sill kick-up portion 30 of the side sill inner 3 a. Joined from the inside in the vehicle width direction.

  Here, in this example, as shown in FIGS. 9 and 11, a portion corresponding to the second gusset member 28 (the front wall portion 24 </ b> A) in the vehicle front-rear direction of the internal space 30 s (closed cross section) of the side sill kick-up portion 30. Has a side sill node member 75 for reinforcing the side sill 3.

  As shown in FIG. 9, the side sill joint member 75 is integrally formed with a main body portion 75a (see FIGS. 9 and 11), a lower end joining flange portion 75b, an upper end joining flange portion 75c, and a vehicle width inner end joining flange portion 75d. Have been. Each of these joining flange portions 75b, 75c, 75d is formed integrally with the main body portion 75a so as to extend rearward from the end corresponding to each of the main body portions 75a to the vehicle.

  As shown in FIG. 9, the lower end joining flange portion 75b, the upper end joining flange portion 75c, and the vehicle width inner end joining flange portion 75d of the side sill joint member 75 are respectively connected to the lower wall portion 3ad of the side sill inner 3a (FIGS. 9 and 11). ), The upper wall portion 3au (see the same drawing), and the inner wall portion (30f) (see the same drawing) in the vehicle width direction from the side facing the internal space 30s of the side sill kick-up portion 30.

  That is, the vehicle width inner end joining flange portion 75d of the side sill node member 75, the vehicle width direction inner wall portion (30f) of the side sill inner 3a, and the vehicle width direction outer end joining flange portion 28b of the second gusset member 28 are: Three sheets are joined by spot welding or the like (see FIG. 9).

  As shown in FIGS. 9 and 10, the lower vehicle body structure of the vehicle according to the present embodiment described above has a left and right rear side frame 6 (rear frame) forming a closed cross section 60 s (see FIGS. 11 to 13) extending in the vehicle front-rear direction. ), An arm front end support portion 20A for supporting an arm front end portion 12 as a front end of the trailing arm 11 of the rear suspension 10 is provided. The arm front end support portion 20A has a vehicle width outer wall portion 30r on the outside in the vehicle width direction. A lower vehicle body structure of a vehicle including a U-shaped portion 21A whose rear is open when viewed from the bottom with an (outer wall), a vehicle width inner wall 23A (inner wall) inside the vehicle width direction, and a front wall 24A, The arm front end support portion 20A is formed with an extended vehicle width outer wall portion 30f (extended outer wall portion) extending forward from the vehicle width outer wall portion 30r from the front wall portion 24A. Delay The vehicle width outer wall portion 30f is constituted by a side sill inner 3a joined to the rear side frame 6, while extending from the vehicle width inner wall portion 23A forward from the front wall portion 24A and joined to the rear side frame 6. A departure width inner wall portion 26 (extended inner wall portion) is formed (see FIGS. 9 to 13).

  According to the above configuration, since the support rigidity of the arm front end support portion 20A that supports the arm front end portion 12 of the rear suspension 10 can be improved, vibration input from the rear wheels to the vehicle body via the rear suspension 10 (input) Load) can be effectively reduced in the arm front end support portion 20A as an input source of the vibration, which can contribute to floor vibration reduction.

  Further, in the present embodiment, the vehicle width inner wall portion 23A is formed of a first gusset member 27 (first gusset member), and the front wall portion 24A is formed of a second gusset member 28 (second gusset member). The first gusset member 27 is integrally formed including the extended vehicle width inner wall portion 26 (see FIG. 3).

  According to the above configuration, the support rigidity in the vehicle front-rear direction of the arm front end support portion 20A that supports the arm front end portion 12 of the rear suspension 10 can be further improved.

  More specifically, the arm front end support portion 20 of the first embodiment includes a vehicle width inner wall portion 23 and a front wall portion 24 provided on the arm front end support portion 20 (the U-shaped portion 21 of the arm front end support portion 20). As described above, it is integrally formed by the arm front end support bracket 25 made of one member (particularly, see FIG. 3). According to this configuration, among the vibrations (loads) input from the rear wheels to the vehicle body via the rear suspension 10, particularly, the vibrations acting in the vehicle width direction are transmitted to the arm front end support portion 20 as an input source of the vibrations. In this case, an advantageous configuration can be obtained.

  On the other hand, the arm front end support portion 20A of the second embodiment includes the vehicle width inner wall portion 23A and the extended vehicle width inner wall portion 26 provided on the arm front end support portion 20A, as described above, and is formed of one member. It is formed integrally with the first gusset member 27 (see especially FIGS. 9 to 12). Thereby, among the vibrations (loads) input to the vehicle body from the rear wheels via the rear suspension 10, particularly the vibrations (loads) acting in the vehicle front-rear direction are transmitted to the arm front end support portion 20A as an input source of the vibrations. Can be effectively suppressed.

  By the way, as in the present embodiment, as the rear suspension 10, a torsion beam type (trailing arm) in which an arm front end support portion 20 (pivot bearing) for supporting the trailing arm 11 (swing arm) is disposed forward of the rear wheel. Is adopted, the input vibration (input load) to the arm front end support portion 20 which is the vibration input point (load input point) from the rear wheel to the vehicle body, particularly the input vibration in the vehicle longitudinal direction. It is clear that the size is likely to be large.

  For this reason, like the arm front end support portion 20A of the second embodiment, the vehicle width inner wall portion 23A and the extended vehicle width inner wall extending forward from the vehicle width inner wall portion 23A and joined to the rear side frame 6. By adopting a configuration including the first gusset member 27 integrally formed with the portion 26, the arm front end support portion 20A as a vibration input point (load input point) is protected against vibration acting in the vehicle longitudinal direction. Advantageously, the vibration (load) input to the vehicle body from the rear wheels via the rear suspension 10 can be effectively reduced even when the torsion beam type is adopted as the rear suspension 10.

  In the present embodiment, as shown in FIGS. 9 to 13, the first gusset member 27 is formed on each upper end of the vehicle width inner wall 23 </ b> A and the extended vehicle width inner wall 26 when joining to the rear side frame 6. The joining flange portion 27a is joined to the vehicle width inner wall portion 6a of the rear side frame 6 by spot welding or the like.

  Thus, the first gusset member 27 in which the vehicle width inner wall portion 23A and the extended vehicle width inner wall portion 26 are integrally formed is not joined to the lower surface (lower wall portion 6c) of the rear side frame 6, but is supported at the arm front end. When a load in the vehicle front-rear direction is input to the portion 20A, a strong joining state with the rear side frame 6 can be maintained, and the total number of spot welds to the rear side frame 6 can be reduced.

  Further, in the present embodiment, since the first gusset member 27 is not joined to the lower surface of the rear side frame 6, the first gusset member 27 is closed at a position corresponding to the front end of the first gusset member 27 on the closed section 60s. In order to reinforce the space between the first gusset member 27 and the side sill 3, for example, a reinforcing joint member such as the front joint member 71 (FIGS. 5 and 6) provided in the first embodiment may be omitted. As a result, it is possible to reduce the manufacturing cost and the weight of the vehicle body (see FIGS. 11 and 12).

  In the present embodiment, the first gusset lower reinforcement bead 45d (first gusset reinforcement bead) is formed from the vehicle width inner wall portion 23A of the first gusset member 27 to the extended vehicle width inner wall portion 26. (See FIGS. 9, 12, and 13).

  According to the above configuration, the rigidity of the first gusset member 27 between the vehicle width inner wall portion 23A and the extended vehicle width inner wall portion 26 can be improved. That is, it is possible to further enhance the integration between the vehicle width inner wall portion 23A and the extended vehicle width inner wall portion 26.

  In the present embodiment, a first gusset reinforcing flange 46 is provided at the lower end of the first gusset member 27 and is bent outward in the vehicle width direction from the vehicle width inner wall 23A to the extended vehicle width inner wall 26. (See FIGS. 9 to 11 and 13).

  According to the above configuration, the first gusset member 27 is formed by forming the first gusset reinforcing flange portion 46 at the lower end of the first gusset member 27 from the vehicle width inner wall portion 23A to the extended vehicle width inner wall portion 26. Rigidity can be improved.

  The present invention is not limited to the configuration of the above-described embodiment, but can be formed in various embodiments.

3a: Side sill inner 6: Rear side frame (rear frame)
6a: Inner wall width of rear side frame (inner wall of rear frame)
6c: Lower wall of rear side frame (lower wall of rear frame)
10 Rear suspension 11 Trailing arm 12 Arm front end (Trailing arm front end)
20, 20A ... arm front end support portions 21, 21A ... U-shaped portions 23, 23A ... vehicle width inner wall portion (vehicle width direction inner wall portion)
24, 24A ... front wall part 26 ... extended car width inner wall part (extended inner wall part)
27 ... first gusset member (first gusset member)
28: second gusset member (second gusset member)
30r: vehicle width outer wall (outer wall in the vehicle width direction outside)
30f ... Extended car width outer wall (Extended car width outer wall)
40 gusset member 40a ridge 41 inner wall extension 42 front wall extension 43 reinforcing bead 44 reinforcing flange 45d first gusset lower reinforcing bead (first gusset reinforcing bead)
46: first gusset reinforcing flange 50: rear side frame rain (rear frame rain)
51 ... Rain lower wall inner part 52 ... Rain inner wall lower part 60s ... Closed section 61 ... Rear floor side panel (rear side frame upper)
71 ... front side joint member (joint member)

Claims (10)

An arm front end support portion for supporting a trailing arm front end of a rear suspension is formed at a lower portion of a left and right rear frame which forms a closed cross section extending in the vehicle front-rear direction. A lower vehicle body structure of a vehicle including a U-shaped portion that is open rearward when viewed from below with an inner wall portion and a front wall portion on the inner side in the vehicle width direction,
The arm front end support section,
An extended outer wall portion extending forward from the front wall portion from the outer wall portion is formed, and the outer wall portion and the extended outer wall portion are constituted by side sill inners joined to the rear frame,
On the other hand, a lower vehicle body structure of a vehicle having an extended inner wall portion extending from the inner wall portion to the front side from the front wall portion and joined to the rear frame. The inner wall portion is formed of a first gusset member, and the front wall portion is formed of a second gusset member,
The lower vehicle body structure of a vehicle according to claim 1, wherein the first gusset member is integrally formed including the extended inner wall portion. The lower vehicle body structure of a vehicle according to claim 2, wherein a first gusset reinforcing bead is formed from the inner wall portion of the first gusset member to the extended inner wall portion. The lower part of the vehicle according to claim 2 or 3, further comprising a first gusset reinforcing flange that is bent outward in the vehicle width direction from the inner wall to the extended inner wall at a lower end of the first gusset member. Body structure. The lower vehicle body structure of a vehicle according to claim 1, wherein the extending inner wall portion is formed by a gusset member that is formed separately from the inner wall portion. 6. The gusset member according to claim 5, further comprising an inner wall extension extending forward from the inner wall, and a front wall extension extending forward from the front wall and continuous with the inner wall extension through a ridge line. 7. Lower body structure of the vehicle. The lower body structure of a vehicle according to claim 6, wherein the gusset member includes a reinforcing flange portion that is bent downward from an outer end in the vehicle width direction of the front wall extension portion. 8. The lower vehicle body structure according to claim 6, wherein the gusset member includes a reinforcing bead extending from the inner wall to a joint portion between the inner wall and the rear frame. 9. A rear frame rain is provided in the rear frame, and the rear frame rain is disposed below a lower inner wall portion of the rear frame disposed inside a lower wall of the rear frame in a vehicle width direction. It is composed of the rain inner wall lower side,
9. The apparatus according to claim 6, wherein the inner wall extension is joined together with the lower part of the rain inner wall, and the front wall extension is joined with the inner part of the lower rain wall so as to sandwich the rear frame, respectively. 9. A lower body structure of the vehicle as described. The lower vehicle body structure of a vehicle according to any one of claims 5 to 9, further comprising a joint member in the rear frame at a position near a front portion of the gusset member.

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