JP7192024B2 - Body bottom structure - Google Patents

Description

The present invention relates to a vehicle body bottom structure.

BACKGROUND ART As a vehicle body bottom structure, there is known one in which an upper cover (hereinafter referred to as a rear bumper) and an undercover are attached to the vehicle body. Specifically, the vehicle body bottom structure is configured such that, for example, a recess is formed in a rib of a rear bumper or an undercover, and the recess is engaged with an engagement hole of the vehicle body. According to this configuration, when the rear bumper and the undercover are attached to the vehicle body, movement of the rear bumper and the undercover can be restricted by engaging the concave portion with the engaging hole of the vehicle body.
Therefore, the position of the undercover can be aligned with the rear bumper. As a result, the undercover can be attached to the rear bumper by fastening the fastening member to the rear bumper (see Patent Document 1, for example).

Japanese Patent No. 6014820

However, in the vehicle body bottom structure of Patent Document 1, it is necessary to form recesses in the ribs of the rear bumper in order to engage the ribs of the rear bumper with the engagement holes of the vehicle body. As a result, the shape of the rib becomes complicated, making it difficult to manufacture the rear bumper.

SUMMARY OF THE INVENTION An object of the present invention is to provide a vehicle body bottom structure that facilitates assembly of an undercover without providing a rear bumper or an undercover with a complicated structure.

In order to solve the above problems, the present invention proposes the following means.
(1) A vehicle body bottom structure according to the present invention includes a bracket (for example, the brackets 13 and 14 in the embodiment) provided in the vehicle body and having a fixing hole (for example, the fixing hole 37 in the embodiment), and the bracket is engaged with the bracket. temporary holding portions (for example, temporary holding portions 48 and 49 of the embodiment) and first fixing holes (for example, first fixing holes 51 and 52 of the embodiment) that are aligned with the fixing holes ( For example, the undercover 17 of the embodiment) and a rear bumper (for example, the a rear bumper 16) and a connecting member that engages with the second fixing hole, the first fixing hole, and the fixing hole to connect the undercover and the rear bumper to the bracket (for example, in the embodiment); of clips 18, 19).

According to this configuration, the temporary holding portion (tongue piece) is formed in the undercover. By engaging (hooking) the temporary holding portion with the bracket, the undercover can be temporarily held with respect to the bracket. In this state, the first fixing hole of the undercover is aligned with the fixing hole of the bracket. Furthermore, by fixing the front portion of the undercover temporarily held by the bracket to the floor panel of the vehicle body, the undercover is maintained in a state of being supported by the vehicle body.

Next, by moving the rear bumper from the rear side of the vehicle body toward the front side of the vehicle body, the second fixing hole of the rear bumper is aligned with the first fixing hole of the undercover. Therefore, the fixing hole of the bracket, the first fixing hole of the undercover, and the second fixing hole of the rear bumper are aligned. A coupling member is engaged with the aligned fixing hole, the first fixing hole, and the second fixing hole.
As a result, the undercover and the rear bumper are connected to the bracket by a connecting member (such as a clip), and the undercover and the rear bumper are assembled to the bracket.

Thus, by forming the temporary holding portion in the undercover and positioning the undercover to the bracket by the temporary holding portion, the undercover and the rear bumper can be attached to the bracket (i.e., the vehicle body) without providing a complicated structure for the rear bumper. ) can be assembled.
Further, by engaging the temporary holding portion of the undercover with the bracket, the undercover can be temporarily held in a state of being positioned with respect to the bracket. This facilitates the work of assembling the undercover.

Furthermore, a simple fixing structure such as a clip can be used as a coupling member that engages with the fixing hole, the first fixing hole, and the second fixing hole. As a result, the undercover and the rear bumper can be assembled to the bracket (vehicle body) simply by inserting the clips into the fixing hole, the first fixing hole, and the second fixing hole, further improving the ease of assembly of the undercover. be able to.

(2) The temporary holding portion is partitioned from the undercover by a slit (for example, the slit 72 in the embodiment) formed in the undercover, and is formed to be elastically deformable (for example, the tongue in the embodiment). 48, 49), the tongue having a flat portion (e.g. flat portion 65 in the embodiment) that engages the bracket and an inclined portion (e.g. Embodiment ramps 66).

According to this configuration, the flat portion and the inclined portion are formed on the tongue piece as the temporary holding portion. By providing the tongue over the inclined portion and the flat portion, the rigidity of the tongue can be increased. As a result, when the tongue is elastically deformed and engaged with the bracket (hooked so as to be sandwiched), the tongue can be made difficult to break, and assembling of the undercover and the rear bumper can be further improved.

(3) The bracket may have a tip portion (for example, the bottom plate tip portion 38 of the embodiment) that is formed in an inclined shape and engages the flat portion.

Here, when the tongue piece is elastically deformed and engaged with the bracket, for example, the tongue piece arranged below the bracket is elastically deformed upward. With the tongue piece raised to a predetermined position, the bracket slides under the tongue piece. Therefore, the tip of the bracket is pressed downward by the restoring force of the tongue, and the tip is sandwiched between the tongue and the undercover. As a result, the tongue engages with the bracket while being hooked so as to sandwich the bracket together with the undercover.

Therefore, the tip of the bracket is inclined. Therefore, when the bracket slips under the tongue piece, the inclined tip portion can be smoothly slid along the tongue piece. As a result, the tongue piece can be easily engaged with the tip portion, and the assembling properties of the undercover and the rear bumper can be further improved.

(4) The undercover may be a molded product made of resin, and the tongue piece may be provided by forming the U-shaped slit in a plan view in the undercover.

According to this configuration, for example, the tongue piece can be provided simply by molding the undercover by sheet stamping molding and forming a U-shaped slit in the molded undercover. As a result, the undercover provided with the tongue piece (that is, the temporary holding portion) can be manufactured at low cost.
In addition, the rear bumper does not need to have ribs on the rear bumper to engage the rear bumper with the vehicle body as in the prior art. As a result, the weight of the rear bumper (that is, the vehicle body bottom structure) can be reduced.

(5) The undercover may have at least two of the first fixing holes, and may have the temporary holding portion near the first fixing holes.

According to this configuration, the undercover has at least two first fixing holes, and the temporary holding portion (that is, tongue) is arranged in the vicinity of the first fixing holes. Therefore, the bracket can form a fixing hole in the vicinity of the tip with which the temporary holding portion is engaged. As a result, even if the length of the portion of the bracket having the tip portion and the fixing hole is shortened, the first fixing hole can be aligned with the fixing hole while the temporary holding portion is engaged with the tip portion. can. Therefore, it is possible to reduce the weight of the bracket (that is, the vehicle body bottom structure).
Furthermore, rigidity can be ensured by shortening the length of the portion of the bracket that has the tip portion and the fixing hole. As a result, deformation of the bracket can be suppressed when the temporary holding portion is engaged with the front end portion of the bracket, and assembling properties of the undercover and the rear bumper can be further improved.

(6) The inclined portion may be located at the rear end portion of the undercover (for example, the rear end portion 44a of the flat portion of the undercover in the embodiment) and may be formed with an upward slope toward the rear of the vehicle body.

According to this configuration, the rear end portion of the undercover is formed with high rigidity in order to ensure the rigidity of the undercover. Therefore, by forming the inclined portion of the tongue (that is, the temporary holding portion) at the rear end portion of the undercover, the rigidity of the tongue can be increased.
In addition, the slanted portion is formed to have an upward slope toward the rear of the vehicle body. As a result, for example, the air flowing below the inclined portion through the lower surface side of the undercover can be rectified by the inclined portion, and the rectified air can flow toward the rear of the vehicle body from the inclined portion.

(7) The undercover has a plurality of beads (for example, the plurality of beads 53, 54, 55 of the embodiment) that are spaced apart in the width direction of the vehicle and extend in the longitudinal direction of the vehicle body. At least one of the plurality of beads may include an extension bead (for example, the first extension bead 54 of the embodiment) that extends to a position overlapping the bracket in the longitudinal direction of the vehicle body.

According to this configuration, a plurality of beads are formed on the undercover, and at least one extended bead among the plurality of beads extends to a position overlapping the bracket in the longitudinal direction of the vehicle body (vehicle traveling direction). Therefore, the extension beat can overlap the temporary holding portion of the undercover in the longitudinal direction of the vehicle body. Thereby, the temporary holding portion can be reinforced by the extension bead. Therefore, the undercover can be easily supported by the bracket in a state where the temporary holding portion is engaged with the bracket.

(8) A front end portion (for example, a front end portion 55a in the embodiment) of the plurality of beads gradually extends toward the front side of the vehicle body as it separates from the temporary holding portion in the vehicle width direction, thereby reinforcing the undercover. Other extension beads (for example, the second extension bead 55 of the embodiment) may be included.

According to this arrangement, the beads included other extension beads. The other extension bead has a front end that gradually extends in an inclined manner forward of the vehicle body as it separates from the temporary holding portion in the vehicle width direction (as it separates). Therefore, the portion of the undercover that is separated from the temporary holding portion in the vehicle width direction can be reinforced with another extension bead. As a result, the overall strength and rigidity of the undercover can be secured, and the undercover can be stably held by the bracket and rear bumper.

(9) The plurality of beads are raised above the undercover, and the undercover is a drainage formed between adjacent beads among the plurality of beads and on the lowest side of the undercover. It may also have holes (eg, drain hole 56 in the embodiment).

According to this configuration, a drainage hole is formed between adjacent beads, and the drainage hole is arranged on the lowermost side (lowermost portion) of the undercover. Thus, the beads can act like a gutter. As a result, the water on the upper surface of the undercover can be guided to the drainage holes by the beads, and can be drained well from the drainage holes.

(10) The bracket includes a vertical plate portion (for example, the vertical plate portion 33 in the embodiment) provided on the vehicle body, and a bottom plate portion (for example, the bottom plate portion 34 in the embodiment) provided with the fixing hole and the tip portion. ) and a convex portion (for example, the convex portion 35 of the embodiment) formed across the vertical plate portion and the bottom plate portion.

Here, when the tongue piece is elastically deformed and engaged with the bracket, for example, the tongue piece arranged below the bottom plate portion is elastically deformed upward. With the tongue piece raised to a predetermined position, the tip of the bottom plate slides under the tongue piece. Therefore, the tip of the bottom plate portion is pressed downward by the restoring force of the tongue, and the tip is sandwiched between the tongue and the undercover. As a result, the tongue piece engages with the tip portion while hooking the bottom plate portion (specifically, the tip portion) together with the undercover.

Therefore, a convex portion is formed across the vertical plate portion and the bottom plate portion 34 of the bracket. Therefore, the strength and rigidity of the bracket can be enhanced. This makes it possible to impart rigidity to the tip of the bottom plate portion of the bracket so that the tongue piece (that is, the undercover) can be temporarily held by the bottom plate portion of the bracket. In this manner, the provisional holding state of the tongue piece (undercover) can be maintained at the tip of the bottom plate portion, so that it is possible to further improve the ease of assembly of the undercover and the rear bumper.

According to the present invention, the assembly work of the undercover can be facilitated without providing a complicated structure to the rear bumper.

BRIEF DESCRIPTION OF THE DRAWINGS It is the perspective view which looked at the vehicle body bottom part structure of one Embodiment which concerns on this invention from the front left side. FIG. 2 is a perspective view of the bottom body structure of FIG. 1 cut along line II-II in a state where a rear panel is provided. It is the perspective view which expanded the III section of FIG. FIG. 4 is an exploded perspective view of the vehicle body bottom structure of FIG. 3 ; FIG. 10 is a perspective view showing an undercover provided in the vehicle body bottom structure of one utility model; 6 is an enlarged perspective view of a VI portion of FIG. 5; FIG. FIG. 7 is a perspective view of the tongue of FIG. 6 elastically deformed upward; FIG. 2 is a perspective view of the vehicle body bottom structure of FIG. 1 as seen from above; It is sectional drawing explaining the assembly|attachment procedure which arrange|positions the undercover of one Embodiment to an assembly|attachment position from the downward direction, and pushes up a tongue piece. It is sectional drawing explaining the assembly|attachment procedure which temporarily holds the undercover of one Embodiment with a tongue piece. It is sectional drawing explaining the assembly|attachment procedure which inserts a clip in the 2nd fixing hole of one Embodiment, a 1st fixing hole, and a fixing hole. FIG. 4 is a perspective view showing a state in which the undercover and rear bumper of one embodiment are attached to the bracket with clips.

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the accompanying drawings. In the drawings, arrow FR indicates the front of the vehicle, arrow UP indicates the upper side of the vehicle, and arrow LH indicates the left side of the vehicle.
<Car body bottom structure>
As shown in FIGS. 1 and 2, the vehicle body bottom structure 10 includes, for example, a rear panel (vehicle body) 12, a plurality of brackets 13 and 14, a rear bumper beam 15, a rear bumper face (rear bumper) 16, and an underside. It comprises a cover 17 and a plurality of coupling members (clips in this embodiment) 18 and 19 . Hereinafter, the rear bumper face 16 may also be referred to as the "rear bumper 16".

<Rear panel>
The rear panel 12 has a right end portion 12a fixed to the rear end portion of the right rear frame (not shown) and a left end portion fixed to the rear end portion of the left rear frame (not shown). That is, the rear panel 12 is a member that extends over the respective ends of the right rear frame and the left rear frame and partitions the rear part of the luggage compartment of the vehicle. That is, the rear panel 12 is a member forming part of the vehicle body.
The right rear frame and the left rear frame extend in the longitudinal direction of the vehicle body on the outside in the vehicle width direction of the vehicle body, and have high strength and rigidity as part of the frame members of the vehicle body.

A plurality of (two in the embodiment) brackets 13 and 14 are provided on the rear panel 12 . The two brackets 13 and 14 are spaced apart in the vehicle width direction at the lower portion 12b of the rear panel 12. As shown in FIG. The number of brackets 13 and 14 can be selected arbitrarily.
Note that the two brackets 13 and 14 are generally the same members. Therefore, the same reference numerals are assigned to the parts of the two brackets 13 and 14, and the bracket 13 on the right side in the vehicle width direction of the two brackets 13 and 14 will be described as a representative example.

<Rear bumper>
A rear bumper beam 15 is arranged behind the vehicle body of the rear panel 12 . A right end portion 15 a of the rear bumper beam 15 is fixed to the rear end portion of the right rear frame via the right extension 22 and the rear panel 12 . The rear bumper beam 15 has a left end portion 15b fixed to the rear end portion of the left rear frame via the left extension 23 and the rear panel 12 . That is, the rear bumper beam 15 extends in the vehicle width direction and spans the right extension 22 and the left extension 23 .

The rear bumper 16 is provided behind the rear bumper beam 15 by, for example, attaching the central portion 16 a of the bumper to the rear bumper beam 15 . Further, the rear bumper 16 has, for example, a bumper right side portion 16b extending from a right end portion of a bumper central portion 16a to a lower side of a left rear fender (not shown). Further, the rear bumper 16 has a bumper left side portion 16c extending from the left end portion of the bumper center portion 16a to the bottom side of the right rear fender (not shown).

The rear bumper 16 has a plurality (two in the embodiment) of projecting pieces 25 and 26 (see FIG. 4 for the projecting piece 25, the projecting piece 26 is not shown) and a plurality (two in the embodiment) of the second Fixing holes 27 and 28 (see FIG. 4 for the second fixing hole 27, the second fixing hole 28 is not shown).
The two protruding pieces 25, 26 are provided below bottom plate portions 34 (described later) of the two brackets 13, 14 with a gap in the vehicle width direction at the lower end portion 16d of the bumper central portion 16a. The two protruding pieces 25 and 26 protrude forward of the vehicle body along the bottom plate portions 34 of the two brackets 13 and 14, respectively. The two second fixing holes 27 and 28 penetrate vertically through the two protrusions 25 and 26 . The number of projecting pieces 25, 26 and second fixing holes 27, 28 can be arbitrarily selected.
The two projecting pieces 25, 26 and the two second fixing holes 27, 28 are generally the same parts. Therefore, of the two projecting pieces 25 and 26 and the two second fixing holes 27 and 28, the projecting piece 25 and the second fixing hole 27 on the right side in the vehicle width direction will be described below as representative examples.

<Bracket>
As shown in FIGS. 2 to 4 , the bracket 13 has a vertical plate portion 33 , a bottom plate portion 34 and a convex portion 35 . The vertical plate portion 33 is provided vertically in the lower portion 12b of the right end portion 12a of the rear panel 12 . The vertical plate portion 33 has, for example, a lower end portion 33 a protruding downward from the lower portion 12 b of the bracket 13 . A bottom plate portion 34 is bent from a lower end portion 33a of the vertical plate portion 33 toward the rear of the vehicle body.

The bottom plate portion 34 has a bottom plate flat portion 36 , a fixing hole 37 , and a bottom plate tip portion (tip portion) 38 . The bottom plate flat portion 36 extends rearward of the vehicle body from the lower end portion 33a of the vertical plate portion 33 along the upper surfaces of raised portions 46 and 47 of the undercover 17, which will be described later. The bottom plate flat portion 36 and the vertical plate portion 33 are generally bent in an L shape when viewed from the side. A fixing hole 37 is formed in the bottom plate flat portion 36 .

The fixing hole 37 penetrates vertically in the center of the bottom plate flat portion 36 . The fixing hole 37 is vertically aligned with first fixing holes 51 and 52 (described later) formed in the raised portions 46 and 47 and a second fixing hole 27 formed in the projecting piece 25 of the rear bumper 16 . are placed in the same position. A bottom plate tip portion 38 is formed at the tip of the bottom plate flat portion 36 .

The bottom plate front end portion 38 extends upward from the front end of the bottom plate flat portion 36 on the rear side of the vehicle body toward the rear of the vehicle body. The bottom plate tip portion 38 engages with a temporary holding portion 48 (described later) of the undercover 17 .

In the bent portion 39 of the vertical plate portion 33 and the bottom plate flat portion 36, a convex portion 35 is formed across the lower end portion 33a of the vertical plate portion 33 and the base end portion of the bottom plate flat portion 36. As shown in FIG. Specifically, the convex portion 35 protrudes in the shape of an inclined rib toward the upper rear side of the vehicle body, and is formed, for example, in a triangular shape when viewed from the side. Therefore, the bending portion 39 between the vertical plate portion 33 and the bottom plate flat portion 36 is reinforced by the convex portion 35, and the strength and rigidity of the bracket 13 are enhanced.

<Undercover>
As shown in FIGS. 1, 4 and 5, the undercover 17 is attached to the bottom plate portions 34 of the two brackets 13 and 14 and the two projecting pieces 25 and 26 (the projecting piece 26 is not shown) of the rear bumper 16. are combined.
The undercover 17 has a rear end portion arranged along the lower end portion 16d of the bumper central portion 16a in a state of being arranged below the vehicle body. The undercover 17 is, for example, a resin molded product molded by sheet stamping molding.
The undercover 17 includes an undercover flat portion 44, an undercover inclined portion 45, a plurality of (two in the embodiment) raised portions 46 and 47, and a plurality (two in the embodiment) temporary holding portions 48 and 49. , at least two (two in the embodiment) first fixing holes 51 , 52 , a plurality of beads 53 , 54 , 55 , and a plurality of drainage holes 56 .

The undercover flat portion 44 is formed in the rear half portion of the undercover 17 and is formed substantially flat with respect to the vehicle front-rear direction and the vehicle width direction. A rear end portion 44a (that is, a rear end portion of the undercover 17) of the undercover flat portion 44 extends in the vehicle width direction along the lower end portion 16d of the bumper central portion 16a. In addition, the undercover flat portion 44 has a first front end portion 44b and a second front end portion 44c at its front end.
The first front end portion 44b is located in the range between the two raised portions 46, 47 in the vehicle width direction of the front end portion of the undercover flat portion 44. As shown in FIG. The first front end portion 44b extends in the vehicle width direction. The second front end portion 44c is located on the left outer side in the vehicle width direction of the front end portion of the undercover flat portion 44 with respect to the range of the two raised portions 46 and 47 in the vehicle width direction. The second front end portion 44c extends obliquely forward of the vehicle body toward the left outer side in the vehicle width direction.

An undercover inclined portion 45 is formed at the front end portion of the undercover flat portion 44 (that is, the first front end portion 44b and the second front end portion 44c). The undercover inclined portion 45 is inclined upward from the front end portion of the undercover flat portion 44 toward the front of the vehicle body.

Further, raised portions 46 and 47 are formed at the right end portion and the central portion of the rear end portion 44a of the undercover flat portion 44, respectively. Two raised portions 46 and 47 are raised upward from the undercover flat portion 44 . The two raised portions 46 , 47 each have a raised flat portion 61 and a raised ramp portion 62 .
The two protuberances 46 and 47 are generally symmetrical members. Therefore, the raised flat portion 61 and the raised inclined portion 62 forming the two raised portions 46 and 47 are given the same reference numerals and described.
The raised flat portion 61 is formed flat along the undercover flat portion 44 . The raised inclined portion 62 is formed with an upward slope from the rear side of the raised flat portion 61 toward the rear of the vehicle body.

Temporary holding portions 48 and 49 are formed on the two raised portions 46 and 47, respectively. The two temporary holding portions 48 and 49 are substantially symmetrical members. Therefore, the temporary holding portion 48 on the right side in the vehicle width direction of the two temporary holding portions 48 and 49 will be described below as a representative example. Also, the two raised portions 46 and 47 will be described with the raised portion 46 on the right side in the vehicle width direction as a typical example.

As shown in FIGS. 3 and 6 , the temporary holding portion 48 is formed by forming a U-shaped slit 72 in plan view in the raised flat portion 61 and the raised inclined portion 62 . and the raised ramp 62 . Both end portions 72a of the slit 72 are positioned on the protruding inclined portion 62 with a space therebetween in the vehicle width direction. In the slit 72, a pair of vertical slits 72b extend from both end portions 72a toward the front of the vehicle body to the protruding flat portion 61 with a certain interval in the vehicle width direction. Further, the slits 72 are formed by connecting the front ends of a pair of vertical slits 72b with a horizontal slit 72c. The lateral slit 72c extends in the vehicle width direction.

That is, the temporary holding portion 48 has both side sides separated from the raised flat portion 61 and the raised inclined portion 62 by a pair of vertical slits 72b, and a distal end side separated from the raised flat portion 61 by the horizontal slit 72c. In addition, the temporary holding portion 48 is connected to the protruding inclined portion 62 at the proximal end 48a.
In this manner, the temporary holding portion 48 is formed in a substantially rectangular tongue shape by being partitioned from the raised flat portion 61 and the raised inclined portion 62 . That is, the temporary holding portion 48 is formed as a tongue piece. Hereinafter, the temporary holding portion 48 may also be referred to as a "tongue piece 48".
The tongue piece 48 is formed in a generally rectangular shape along the slit 72 .

Here, the undercover 17 is molded by sheet stamping molding as described above. Furthermore, the tongue piece 48 can be provided only by forming a U-shaped slit 72 in a plan view in the undercover 17 . Thereby, the undercover 17 provided with the tongue piece 48 can be manufactured at low cost.

The tongue piece 48 has a flat portion 65 , an inclined portion 66 and a bent portion 67 . The flat portion 65 is formed by being partitioned from the raised flat portion 61 by the slit 72 . Therefore, the flat portion 65 is formed flat along the undercover flat portion 44 in the same manner as the raised flat portion 61 .
The sloped portion 66 is formed by being separated from the raised sloped portion 62 by a slit 72 . Therefore, similarly to the protruding inclined portion 62, the inclined portion 66 is formed with an upward slope from the rear end (that is, the bent portion 67) of the flat portion 65 toward the rear of the vehicle body. The rear end of the flat portion 65 corresponds to the rear side of the raised flat portion 61 . That is, the inclined portion 66 is formed at the rear end portion 44 a of the undercover flat portion 44 .
The inclined portion 66 is formed in an upwardly inclined state toward the rear of the vehicle body so as to separate from the bottom plate portion 34 of the bracket 13 . Therefore, the inclined portion 66 is formed to have an upward slope with respect to the flat portion 65 .

Here, the rear end portion 44a of the undercover flat portion 44 is formed with high rigidity in order to ensure the rigidity of the undercover 17. As shown in FIG. Therefore, by forming the inclined portion 66 of the tongue piece 48 at the rear end portion 44a of the undercover flat portion 44, the rigidity of the tongue piece 48 can be increased.
In addition, the inclined portion 66 is formed to have an upward slope toward the rear of the vehicle body. As a result, for example, the air flowing below the inclined portion 66 via the lower surface side of the undercover 17 can be rectified by the inclined portion 66, and the rectified air can flow from the inclined portion 66 to the rear of the vehicle body.

Further, the inclined portion 66 is formed in an upwardly inclined state toward the rear of the vehicle body so as to separate from the bottom plate portion 34 of the bracket 13 . Therefore, the tongue piece 48 is formed in a V shape with the flat portion 65 and the inclined portion 66 . Therefore, the tongue piece 48 has a bent portion 67 formed by the intersection of the flat portion 65 and the inclined portion 66 . The bent portion 67 extends so as to be inclined in the longitudinal direction of the vehicle body with respect to the width direction of the vehicle. Therefore, a large area is ensured for the flat portion 65 .
The reason why the bent portion 67 of the tongue piece 48 is inclined in the longitudinal direction of the vehicle body to secure a large area of the flat portion 65 will be described later in detail.
Further, by forming the tongue piece 48 in a V shape with the flat portion 65 and the inclined portion 66, the length of the tongue piece 48 in the front-rear direction of the vehicle body can be reduced compared to, for example, the case where the entire tongue piece is formed flat. can be kept short.
The reason why the length in the front-rear direction of the vehicle body is shortened by forming the tongue piece 48 in a V-shape will be described in detail later.

As shown in FIGS. 3, 4, and 7, the tongue piece 48 is formed to be elastically deformable in the vertical direction (that is, in the direction of arrow A) about the base end 48a. The tongue piece 48 engages with the bottom plate tip portion 38 of the bracket 13 in a state of being elastically deformed upward. Specifically, when the tongue piece 48 is elastically deformed upward about the base end 48a, the tip end 38a of the bottom plate distal end portion 38 comes into contact with the tip end 38a of the bottom plate distal end portion 38 with the restoring force of the tongue piece 48. downwards. Therefore, the bottom plate tip portion 38 (that is, the bottom plate portion 34 of the bracket 13 ) is sandwiched between the tongue piece 48 and the raised flat portion 61 . As a result, the tongue piece 48 engages with the bottom plate portion 34 in a state of being hooked so as to sandwich the bottom plate portion 34 together with the raised flat portion 61 .

Here, as shown in FIGS. 6 and 7, both ends 72a of the slit 72 are positioned on the protruding inclined portion 62. As shown in FIG. Therefore, both end portions 72 a of the slit 72 are arranged at positions higher than the raised flat portion 61 . As a result, the supporting shaft (that is, the proximal end 48 a ) for elastically deforming the tongue piece 48 can be arranged at a position higher than the raised flat portion 61 . The reason why the support shaft (base end 48a) of the tongue piece 48 is arranged at a position higher than the raised flat portion 61 will be described in detail later.

Further, as shown in FIGS. 4 to 6, the two raised flat portions 61 are formed with first fixing holes 51 and 52, respectively. The two first fixing holes 51, 52 are formed in the same shape. Therefore, the first fixing hole 51 on the right side in the vehicle width direction of the two first fixing holes 51 and 52 will be described below as a representative example.
The first fixing hole 51 is positioned in the protruded flat portion 61 in front of the vehicle body with respect to the flat portion 65 of the tongue 48 and in the vicinity of the flat portion 65, and penetrates in the vertical direction. In other words, the tongue 48 is provided near the first fixing hole 51 .
The first fixing hole 51 is arranged at a position vertically aligned with the fixing hole 37 formed in the bottom plate portion 34 of the bracket 13 and the second fixing hole 27 formed in the projecting piece 25 of the rear bumper 16 . ing.

As shown in FIGS. 5 and 8, the undercover flat portion 44 and the undercover inclined portion 45 of the undercover 17 are formed with a plurality of beads 53 , 54 , 55 . A plurality of beads 53 , 54 , 55 . and extends in the front-rear direction of the vehicle body (that is, the traveling direction of the vehicle body). The plurality of beads 53 , 54 , 55 . extension bead) 55;

The plurality of base beads 53 are formed, for example, on the front side of the vehicle body between the two protuberances 46 and 47, and are further formed in the center between the two protuberances 46 and 47 in the vehicle width direction. For example, the front ends 53 a of the plurality of base beads 53 are formed on the undercover slope 45 so that the front ends 53 a are inclined along the undercover slope 45 . Therefore, the plurality of base beads 53 are enhanced in strength and rigidity.

The two first extension beads 54 are formed between the two protrusions 46 and 47 and in the vicinity of the two protrusions 46 and 47 in the vehicle width direction. As with the base bead 53 , the front ends 54 a of the two first extension beads 54 are formed on the undercover slope 45 so that the front ends 54 a are inclined along the undercover slope 45 . there is Therefore, the plurality of base beads 53 are enhanced in strength and rigidity.
Further, the two first extension beads 54 extend rearward of the vehicle body to a position where the rear end portion 54b overlaps the two brackets 13, 14 and the two raised portions 46, 47 in the vehicle longitudinal direction (that is, the vehicle traveling direction). extended. Therefore, the two first extension beads 54 overlap the two tongue pieces 48 and 49 (the tongue piece 49 is the temporary holding portion 49) in the longitudinal direction of the vehicle body. The two tongues 48 , 49 are thereby reinforced with the first extension bead 54 .

Each of the plurality of second extension beads 55 has a front end portion 55a that gradually increases toward the front of the vehicle body along the second front end portion 44c as it separates leftward in the vehicle width direction from the tongue piece 49 (that is, as it separates). extended. Therefore, the portion of the undercover 17 that is separated from the tongue piece 49 to the left outer side (in the vehicle width direction) in the vehicle width direction is reinforced by the plurality of second extension beads 55 to increase strength and rigidity.

A plurality of drainage holes 56 are formed between adjacent beads among the plurality of beads 53 , 54 , 55 . Further, the plurality of drain holes 56 are, for example, the boundary between the undercover flat portion 44 and the undercover inclined portion 45 (that is, the first front end portion 44b) and the vicinity of the boundary portion (that is, the second front end 44c). is formed in
Here, the vicinity of the first front end portion 44b and the second front end portion 44c forms the lowest portion (lowermost side) of the undercover 17. As shown in FIG. Therefore, the plurality of drain holes 56 are arranged at the lowest portion (lowermost side) of the undercover 17 . As a result, the plurality of beads 53 , 54 , 55 . As a result, water can be drained well from each drain hole 56 .

As shown in FIGS. 3 to 5 and 8, two projecting pieces 25 (projecting piece 26 is not shown) of the rear bumper are provided with second fixing holes 27 and 28 (the second fixing hole 28 is not shown) are formed. Fixing holes 37 are formed in the bottom plate portions 34 (specifically, the flat bottom plate portions 36) of the two brackets 13 and 14, respectively. Furthermore, the two ridges 46 and 47 of the undercover are each formed with a first fixing hole 51 .
Two first fixing holes 51 and 52 are arranged below the two fixing holes 37 so as to be aligned in the vertical direction. Also, two second fixing holes 27 and 28 are arranged below the two first fixing holes 51 and 52 so as to be vertically aligned with each other.

A clip 18 is engaged with one of the two second fixing holes 27 and 28, one of the two first fixing holes 51 and 52, and one of the two fixing holes 37 from below. A clip 19 is engaged with the other of the two second fixing holes 27 and 28, the other of the two first fixing holes 51 and 52, and the other of the two fixing holes 37 from below. That is, in the embodiment, two clips 18 and 19 are illustrated as multiple fastening members.
An undercover 17 and a rear bumper 16 are connected to certain brackets 13, 14 (ie, the vehicle body) by two clips 18,19.

<Assembly procedure>
Next, an assembly procedure for assembling the undercover 17 to the vehicle body of the vehicle body bottom structure 10 will be described with reference to FIGS. 9 to 11. FIG.
As shown in FIG. 9, the undercover 17 is placed at the assembly position from below. As a result, the raised flat portion 61 of the undercover 17 abuts against the bottom plate portion 34 of the bracket 13 from below. The first fixing hole 51 of the raised flat portion 61 is aligned with the fixing hole 37 of the bottom plate portion 34 from below. The tongue piece 48 of the undercover 17 is positioned below the bottom plate tip portion 38 of the bottom plate portion 34 . In this state, the tongue piece 48 is pushed up from below with a pressing force F1.
Here, a large area of the flat portion 65 is secured by inclining the bent portion 67 (see also FIG. 6) of the tongue piece 48 in the longitudinal direction of the vehicle body. Therefore, when pushing up the tongue piece 48, the tongue piece 48 can be easily lifted even if the pushing finger is slightly displaced in the longitudinal direction of the vehicle body.

As shown in FIG. 10, the tongue piece 48 is elastically deformed by the upward force F1 and pushed up to a predetermined position as indicated by an arrow B with the base end 48a as an axis.
Here, the proximal end 48 a (that is, the support shaft) of the tongue piece 48 is arranged at a position higher than the raised flat portion 61 . Therefore, when the tongue piece 48 is pushed up, the necessary amount of push-up of the tongue piece 48 can be ensured while the amount of elastic deformation of the tongue piece 48 is kept small. This makes it difficult for the tongue piece 48 to break when the tongue piece 48 is pushed up.
With the tongue piece 48 pushed up to a predetermined position, the bottom plate tip portion 38 of the bottom plate portion 34 elastically deformed together with the tongue piece 48 is restored to its original shape by the restoring force of the bottom plate portion 34 and moves downward from the tongue piece 48 . dive in. Here, the tip end portion 38 of the bottom plate which is inserted under the tongue piece 48 is formed in an inclined shape. Therefore, the tip end portion 38 of the bottom plate can be smoothly slid along the tongue piece 48 and smoothly slipped under the tongue piece 48 .

A protrusion 35 is formed across the vertical plate portion 33 and the bottom plate portion 34 of the bracket 13 . Therefore, the strength and rigidity of the bracket 13 are enhanced. As a result, when the elastically deformed bottom plate portion 34 restores its original shape, the restoring force of the bottom plate portion 34 is increased, and the bottom plate tip portion 38 can be slipped under the tongue piece 48 more smoothly.

As shown in FIG. 11, the push-up force F1 (see FIG. 9) is released from the tongue piece 48 in a state where the bottom plate tip portion 38 of the bottom plate portion 34 is slipped under the tongue piece 48 . The flat portion 65 of the tongue piece 48 contacts the tip 38a of the bottom plate tip portion 38, and presses the tip 38a of the bottom plate tip portion 38 downward by the restoring force F2 of the tongue piece 48. As shown in FIG.

Here, the proximal end 48 a (that is, the support shaft) of the tongue piece 48 is arranged at a position higher than the raised flat portion 61 . Therefore, the restoring force of the tongue piece 48 can be efficiently transmitted to the tip 38 a of the bottom plate tip portion 38 , and the holding force of the bottom plate tip portion 38 can be secured by the restoring force of the tongue piece 48 . As a result, the tip end portion 38 of the bottom plate is suitably sandwiched between the flat portion 65 and the raised flat portion 61 of the tongue piece 48 , and the tongue piece 48 is temporarily held by the tip end portion 38 of the bottom plate.

A protrusion 35 is formed across the vertical plate portion 33 and the bottom plate portion 34 of the bracket 13 . Therefore, the strength and rigidity of the bracket 13 are enhanced. As a result, the bottom plate distal end portion 38 of the bottom plate portion 34 can be provided with rigidity that allows the tongue piece 48 (that is, the undercover 17 ) to be temporarily held by the bottom plate portion 34 of the bracket 13 . That is, the temporary holding state of the tongue piece 48 (undercover 17 ) can be maintained by the bottom plate front end portion 38 .

As a result, the tongue piece 48 engages with the bottom plate tip 38 while hooking the bottom plate 34 (specifically, the bottom plate tip 38 ) together with the raised flat portion 61 of the undercover 17 . Therefore, the rear end portion of the undercover 17 (the rear end portion 44a of the undercover flat portion 44) is temporarily held by the rear panel 12 (that is, the vehicle body) via the bracket 13. As shown in FIG. In this state, the front end portion of the undercover 17 is fastened to a floor panel (not shown) of the vehicle body with a fastening member such as a clip. Therefore. The entire undercover 17 is temporarily held under the vehicle body.

As shown in FIG. 11 , the projecting piece 25 of the rear bumper 16 is arranged below the raised flat portion 61 while the undercover 17 is temporarily held on the lower side of the vehicle body. The second fixing holes 27 of the arranged protruding piece 25 are aligned with the first fixing holes 51 of the raised flat portion 61 and the fixing holes 37 of the bottom plate portion 34 from below. In this state, the clip 18 is inserted from below into the second fixing hole 27, the first fixing hole 51 and the fixing hole 37 as indicated by an arrow C. As shown in FIG.

Here, as shown in FIGS. 11 and 12, the length L of the tongue piece 48 in the longitudinal direction of the vehicle body is kept short by being formed in a V shape. Therefore, it is possible to prevent the tongue piece 48 from interfering with the tip portion 18 a of the clip 18 protruding from the fixing hole 37 . Thereby, the clip 18 can be easily inserted into the second fixing hole 27 , the first fixing hole 51 and the fixing hole 37 .
Therefore, the clip 18 engages the second fixing hole 27 , the first fixing hole 51 and the fixing hole 37 , and the raised flat portion 61 is coupled to the bottom plate portion 34 and the projecting piece 25 . As a result, the undercover 17 and the rear bumper 16 are attached to the bracket 13, completing the procedure for attaching the undercover 17 to the vehicle body.

As described above, according to the vehicle body bottom structure 10 of the embodiment, as shown in FIGS. 3 and 4, the tongue piece 48 is formed on the undercover 17 as a temporary holding portion. The undercover 17 can be temporarily held on the bracket 13 by engaging (hooking) the tongue piece 48 with the bottom plate tip portion 38 of the bracket 13 . In this state, for example, the first fixing hole 51 of the undercover 17 is vertically aligned with the fixing hole 37 of the bracket 13 . Furthermore, by fixing the front end portion of the undercover 17 temporarily held by the bracket 13 to the floor panel of the vehicle body, the undercover 17 is kept in a state of being temporarily held by the vehicle body.

Next, by moving the rear bumper 16 from the rear side of the vehicle body toward the front side of the vehicle body, the second fixing holes 27 of the rear bumper 16 are vertically aligned with the first fixing holes 51 of the undercover 17 . Therefore, fixing hole 37 of bracket 13, first fixing hole 51 of undercover 17, and second fixing hole 27 of rear bumper 16 are vertically aligned. The clip 18 is engaged with the aligned fixing hole 37 , first fixing hole 51 and second fixing hole 27 .
As a result, the undercover 17 and the rear bumper 16 are coupled to the bracket 13 with the clips 18 , and the undercover 17 and the rear bumper 16 are assembled to the bracket 13 .

Thus, the undercover 17 is formed with the tongue 48 and the undercover 17 is positioned on the bracket 13 by the tongue 48 . Accordingly, the undercover 17 and the rear bumper 16 can be assembled to the bracket 13 (that is, the vehicle body) without providing the rear bumper 16 with a complicated structure.
Further, by engaging the tongue piece 48 of the undercover 17 with the bracket 13 , the undercover 17 can be temporarily held in a state of being positioned with respect to the bracket 13 . This facilitates the work of assembling the undercover 17 .

Furthermore, a simple fixing structure such as a clip 18 can be used as a connecting member that engages with the fixing hole 37, the first fixing hole 51, and the second fixing hole 27, for example. As a result, the undercover 17 and the rear bumper 16 can be assembled to the bracket 13 (vehicle body) simply by inserting the clips 18 into the fixing holes 37, the first fixing holes 51, and the second fixing holes 27. can further improve the assemblability.

In addition, the rear bumper 16 does not need to have ribs on the rear bumper and engage the rear bumper with the vehicle body with the ribs as in the prior art. As a result, the weight of the rear bumper 16 (that is, the vehicle body bottom structure) can be reduced.

A proximal end 48 a (that is, a support shaft) of the tongue piece 48 is arranged at a position higher than the protruding flat portion 61 . Therefore, when the tongue piece 48 is pushed up, the necessary amount of push-up of the tongue piece 48 can be ensured while the amount of elastic deformation of the tongue piece 48 is kept small. As a result, when the tongue 48 is pushed up, the tongue 48 is less likely to break, and the assembly of the undercover 17 and the rear bumper 16 can be further improved.

Further, the tip end portion 38 of the bottom plate with which the tip end of the tongue piece 48 abuts is formed in an inclined shape. Therefore, when the tip end portion 38 of the bottom plate of the bracket 13 slips under the tongue piece 48 , the tip end portion 38 of the inclined bottom plate can be smoothly slid along the tongue piece 48 . As a result, the tongue piece 48 can be easily engaged with the tip end portion 38 of the bottom plate, and the ease of assembly of the undercover 17 and the rear bumper 16 can be further improved.

In addition, a first fixing hole 51 is formed in the undercover 17 and a tongue 48 is arranged near the first fixing hole 51 . Therefore, the bottom plate portion 34 of the bracket 13 can form the fixing hole 37 in the vicinity of the bottom plate tip portion 38 with which the flat portion 65 of the tongue piece 48 is engaged. As a result, even if the length of the bottom plate portion 34 having the bottom plate tip portion 38 and the fixing hole 37 in the bracket 13 is shortened, the flat portion 65 of the tongue piece 48 is engaged with the bottom plate tip portion 38 . A first fixing hole 51 can be aligned with the fixing hole 37 . Therefore, the weight of the bracket 13 (that is, the vehicle body bottom structure 10) can be reduced.

Furthermore, the rigidity of the bracket 13 can be ensured by shortening the length (specifically, in the longitudinal direction of the vehicle body) of the bottom plate portion 34 having the bottom plate tip portion 38 and the fixing hole 37 in the bracket 13 . As a result, deformation of the bottom plate portion 34 of the bracket 13 can be suppressed when the tongue piece 48 is engaged with the tip portion 38 of the bottom plate of the bracket 13, and the ease of assembly of the undercover 17 and the rear bumper 16 can be further improved. can.

Further, as shown in FIGS. 5 and 8, a plurality of beads 53, 54, 55 are formed on the undercover 17, and among the plurality of beads 53, 54, 55, two first extensions are formed. The bead 54 extends to a position overlapping the bracket 13 in the longitudinal direction of the vehicle body. Therefore, the two first extension beads 54 can overlap the two tongues 48 of the undercover 17 in the longitudinal direction of the vehicle body. This allows the two tongues 48 to be reinforced with the two first extension beads 54 . Therefore, the undercover 17 can be easily supported by the bracket 13 in a state where the tongue piece 48 is engaged with the tip end portion 38 of the bottom plate of the bracket 13 .

Furthermore, the plurality of beads 53 . . . , 54 . The front ends 55a of the plurality of second extension beads 55 gradually extend toward the front of the vehicle body in an inclined manner as they move away from the tongue piece 49 to the left outer side in the vehicle width direction. Therefore, the portion of the undercover 17 that is separated from the tongue 49 to the left outer side in the vehicle width direction can be reinforced by the plurality of second extension beads 55 . As a result, the strength and rigidity of the undercover 17 as a whole can be secured, and the undercover 17 can be stably held by the bracket 13 and the rear bumper 16 .

In addition, as shown in FIGS. 3 and 4, a protrusion 35 is formed across the vertical plate portion 33 and the bottom plate portion 34 of the bracket 13, thereby increasing the strength and rigidity of the bracket. As a result, the bottom plate distal end portion 38 of the bottom plate portion 34 can be provided with rigidity that allows the tongue piece 48 (that is, the undercover 17 ) to be temporarily held by the bottom plate portion 34 of the bracket 13 . In this manner, the temporary holding state of the tongue piece 48 (undercover 17) can be maintained by the bottom plate front end portion 38, so that the undercover 17 and the rear bumper 16 can be assembled more easily.

In addition, by increasing the strength and rigidity of the bracket 13 with the convex portion 35, when the elastically deformed bottom plate portion 34 is restored to its original shape, the restoring force of the bottom plate portion 34 is increased, and the tip end portion 38 of the bottom plate is moved to the tongue portion 48. can be smoothly slipped under the As a result, the tongue piece 48 can be easily engaged with the tip end portion 38 of the bottom plate, and the ease of assembly of the undercover 17 and the rear bumper 16 can be further improved.

The technical scope of the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.
For example, in the above embodiment, the clips 18 and 19 are used as the fastening members, but the fastening members are not limited to the clips 18 and 19 . Alternatively, other fastening members such as bolts, nuts or rivets may be used.

In the above embodiment, the brackets 13, 14, the clips 18, 19, the second fixing holes 27, 28, and the temporary holding portions (tongues) 48, 49 are provided. The number is not limited to two. As another example, the numbers of brackets 13, 14, clips 18, 19, second fixing holes 27, 28, and temporary holding portions (tongues) 48, 49 may be arbitrarily selected.

Furthermore, in the above embodiment, an example in which two first extension beads 54 are provided has been described, but the number of first extension beads 54 is not limited to two. As another example, the number of first extension beads 54 may be arbitrarily selected.

In addition, it is possible to appropriately replace the constituent elements in the above-described embodiment with well-known constituent elements without departing from the spirit of the present invention, and the modifications described above may be combined as appropriate.

10 Vehicle bottom structure 13, 14 Bracket 17 Under cover 16 Rear bumper 18, 19 Clip (fastening member)
27, 28 Second fixing hole 33 Vertical plate portion 34 Bottom plate portion 35 Convex portion 37 Fixing hole 38 Bottom plate tip (tip)
44 undercover flat portion 44a rear end (rear end of undercover)
48, 49 Temporary holding part (tongue piece)
51, 52 First fixing holes 53..., 54..., 55... Plural beads 54 First extension bead (extension bead)
55 second extension bead (other extension bead)
55a Front end portion 56 Drainage hole 65 Flat portion 66 Inclined portion 72 Slit

Claims (10)

a bracket provided on the vehicle body and having a fixing hole;
an undercover having a temporary holding portion that engages with the bracket and a first fixing hole that is aligned with the fixing hole;
a rear bumper having a second fixing hole aligned with the first fixing hole;
a coupling member engaged with the second fixing hole, the first fixing hole, and the fixing hole to couple the undercover and the rear bumper to the bracket;
A vehicle body bottom structure characterized by: The temporary holding part is
The undercover is separated from the undercover by a slit formed in the undercover, and consists of a tongue formed to be elastically deformable,
The tongue piece
a flat portion that engages with the bracket and an inclined portion that is inclined with respect to the flat portion;
The vehicle body bottom structure according to claim 1, characterized in that: The bracket has a distal end portion that is formed in an inclined shape and engages the flat portion,
The vehicle body bottom structure according to claim 2, characterized in that: The undercover is
A molded article made of resin,
The tongue piece
provided by forming the U-shaped slit in a plan view in the undercover,
The vehicle body bottom structure according to claim 2, characterized in that: The undercover is
having at least two of the first fixing holes;
Having the temporary holding portion in the vicinity of the first fixing hole,
The vehicle body bottom structure according to claim 1, characterized in that: The inclined portion is
Located at the rear end of the undercover and formed upward toward the rear of the vehicle body,
The vehicle body bottom structure according to claim 2, characterized in that: The undercover is
having a plurality of beads formed at intervals in the width direction of the vehicle and extending in the longitudinal direction of the vehicle body;
The plurality of beads are
at least one of which extends to a position overlapping the bracket in the longitudinal direction of the vehicle body,
The vehicle body bottom structure according to claim 1, characterized in that: The plurality of beads are
Another extension bead for reinforcing the undercover, the front end portion of which gradually extends to the front side of the vehicle body as it separates from the temporary holding portion in the vehicle width direction,
The vehicle body bottom structure according to claim 7, characterized in that: The plurality of beads are
raised above the undercover,
The undercover is
Drainage holes formed between adjacent beads among the plurality of beads and on the lowermost side of the undercover,
The vehicle body bottom structure according to claim 7, characterized in that: The bracket is
a vertical plate portion provided on the vehicle body;
a bottom plate portion provided with the fixing hole and the tip portion;
a convex portion formed across the vertical plate portion and the bottom plate portion;
The vehicle body bottom structure according to claim 3, characterized in that:

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