JP2019166988A - Vehicle body lower structure - Google Patents

Abstract

An object of the present invention is to prevent under-floor traveling wind (a so-called under-floor flow) from rising into a rear wheel house and from entering the rear wheel from the outer edge of the arm cover in the vehicle width direction, thereby suppressing the flow from entering the rear wheel. Accordingly, it is an object of the present invention to provide a vehicle body underside structure capable of suppressing turbulence in a wake of a vehicle body. A torsion beam type rear suspension comprising a pair of left and right trailing arms and a torsion beam connecting the right and left trailing arms is provided. A plate-shaped rectifying arm cover 50 is mounted below the trailing arm 41 so as to cover the lower part of the trailing arm 41 when viewed from the underside of the vehicle body. The outer edge is provided with an extension portion 50A that enters the rim 11R of the rear wheel 11. [Selection diagram] FIG.

Description

  The present invention relates to a vehicle body lower surface structure, and more specifically, includes a torsion beam type rear suspension including a pair of left and right trailing arms and a torsion beam connecting them, and a floor underflow for rectification covering the vehicle lower surface in front of the rear suspension. The present invention relates to a vehicle body lower surface structure to which a cover is attached.

  Generally, a torsion beam type rear suspension is known as a structure for suspending a pair of left and right rear wheels. This torsion beam type rear suspension includes a pair of left and right trailing arms extending in the vehicle front-rear direction, and a torsion beam extending in the vehicle width direction and connecting them.

  For the purpose of suppressing the inflow of under-floor running wind into the rear wheel house, a structure in which a plate-like rectifying under cover that covers the torsion beam type rear suspension under the trailing arm of the torsion beam type rear cover as viewed from the bottom of the vehicle body is considered. .

  Providing the above-mentioned under cover can suppress the underfloor traveling wind from entering the wheel house, but the traveling wind flowing along the under cover is sucked out by the side flow of the vehicle body having a high flow velocity. As a result, it has been found that there is a flow that rises and enters the wheel (rear wheel) from the outer edge of the undercover in the vehicle width direction.

  This flow component is sucked out by the side flow of the vehicle body having a high flow velocity, flows out from the spoke surface of the rear wheel to the side surface of the vehicle body, and becomes a factor disturbing the vehicle body rear flow.

By the way, Patent Document 1 discloses a structure in which a rectifying under cover is attached to a lower part of a trailing arm so as to cover the lower part of the trailing arm in a vehicle having a torsion beam type rear suspension.
Patent Document 2 discloses a structure including a torsion beam type rear suspension and a rectifying rear under cover provided on the lower surface of the rear vehicle body.

  However, none of the above-mentioned Patent Documents 1 and 2 discloses the point of focusing on the flow that rises and enters the wheel (rear wheel) from the outer edge in the vehicle width direction of the under cover that covers the lower part of the trailing arm. .

Japanese Patent No. 5235220 JP 2017-39354 A

  Therefore, the present invention blocks the flow of the under floor traveling wind (so-called under-floor flow) from rising into the rear wheel house and entering the rear wheel from the outer edge of the arm cover in the vehicle width direction. Therefore, an object of the present invention is to provide a vehicle body bottom surface structure that can suppress the disturbance of the vehicle body wake.

  The vehicle body lower surface structure according to the present invention includes a torsion beam type rear suspension comprising a pair of left and right trailing arms and a torsion beam connecting them, and a rectifying floor under cover for covering the vehicle lower surface is attached to the front of the rear suspension. A plate-like rectifying arm cover is attached to the lower part of the trailing arm so as to cover the lower surface of the vehicle body when viewed from the lower surface of the vehicle body. It has an extension part that goes into the rim.

  According to the above configuration, the underfloor wind (so-called under-floor flow) ascends and enters the rear wheel house is blocked by the arm cover and moved rearward along the arm cover. Thus, the flow that rises and enters the rear wheel from the outer edge in the vehicle width direction can be suppressed by the above-described extension, thereby suppressing the turbulence of the vehicle body wake.

  In one embodiment of the present invention, the rear end side of the floor under cover and the front end side of the arm cover are arranged in close proximity to each other as viewed from the bottom of the vehicle body, and the rear end portion of the floor under cover is outside the vehicle. The outer edge and the outer edge of the front end of the arm cover on the outer side of the arm cover bypass the front inner surface of the rear wheel and continue in the vehicle front-rear direction.

  According to the above configuration, it is possible to prevent the wind passing along the bottom surface of the floor under cover from rising and flowing into the wheel house after the floor under cover is finished in cooperation with the arm cover. .

In an embodiment of the present invention, the extension portion is configured in a cantilever shape projecting toward the rim side of the rear wheel from the vehicle outer side end portion of the trailing arm, and at least the extension portion of the arm cover. A vertical wall portion extending upward is provided on the outer edge in the vehicle width direction.
According to the said structure, even if the extension part of the said arm cover is a cantilever structure, the intensity | strength ensuring of an arm cover can be aimed at by the said vertical wall part.

  According to this invention, the underfloor traveling wind (so-called under-floor flow) is prevented from rising and entering the rear wheel house, and the flow of rising and entering the rear wheel from the outer edge of the arm cover in the vehicle width direction is suppressed. Thus, there is an effect that the disturbance of the wake of the vehicle body can be suppressed.

Side view of a vehicle provided with a vehicle body bottom surface structure of the present invention Bottom view of the main part of FIG. Enlarged view of the left side of the vehicle in FIG. Side view showing related structure between floor undercover and arm cover Cross-sectional view taken along the line AA in FIG. The main part enlarged bottom view which shows the flow of the underfloor running wind of a present Example (A) is a bottom perspective view showing the flow of the underfloor traveling wind of the present embodiment, (b) is a bottom perspective view showing the flow of the underfloor traveling wind of the comparative example.

  The underfloor wind (so-called under-floor flow) is prevented from rising into the rear wheel house and entering the rear wheel from the outer edge of the arm cover in the vehicle width direction. For the purpose of suppressing turbulence in the wake, a torsion beam type rear suspension comprising a pair of left and right trailing arms and a torsion beam connecting them is provided. Is attached to the lower part of the trailing arm, and a plate-like rectifying arm cover is attached to the lower part of the trailing arm as viewed from the lower surface of the vehicle body. This is achieved by having an extension that goes into the rim of the wheel.

An embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a side view of a vehicle having the vehicle body bottom surface structure, FIG. 2 is a bottom view of the main part of FIG. 1, FIG. 3 is an enlarged view of the left side of the vehicle in FIG. FIG. 5 is a cross-sectional view taken along the line AA in FIG. 3, and FIG. 6 is an enlarged bottom view of the main part showing the flow of the underfloor traveling wind according to the present embodiment. 7A is a bottom perspective view showing the flow of the underfloor traveling wind of this embodiment, and FIG. 7B is a bottom perspective view showing the flow of the underfloor traveling wind of the comparative example.

As shown in FIG. 1, a front door 2 as a side door that closes the front door opening 1 at the front of the vehicle in an openable and closable manner and a side door that closes the rear door opening 3 at the rear of the vehicle in an openable and closable manner. The rear door 4 is provided.
The above-described front door 2 includes a door outer handle 5, and similarly, the above-described rear door 4 also includes a door outer handle 6.

  As shown in FIG. 1, a front fender panel 7 that covers the side of the engine room is provided at the front portion of the front door 2 described above, and is located below the front fender panel 7 in correspondence with the position of the front wheel 8. The front wheel house 9 is integrally provided.

As shown in FIG. 1, a rear fender panel 10 that covers the side of the cargo compartment is provided at the rear of the rear door 4 described above. House 12 is provided integrally.
In FIG. 1, reference numeral 13 denotes a door mirror, and reference numeral 14 denotes a rear bumper face formed so as to go from the rear portion of the vehicle to the left and right vehicle side portions.

As shown in FIG. 2, a side sill 15 is provided between the lower end of the rear edge of the front wheel house 9 and the lower end of the front edge of the rear wheel house 12.
The side sill 15 is a vehicle body strength member having a side sill closed cross section extending in the vehicle front-rear direction by joining and fixing the side sill outer and the side sill inner 15A.

  As shown in FIG. 2, resin garnishes 16, 16 are attached to the pair of left and right side sills 15, 15 so as to cover the side sills 15 between the front and rear wheel houses 9, 12.

  A tire deflector 17 is provided at the rear end of the garnish 16 so as to face the front part of the rear wheel 11 in the rear wheel house 12, and a side flow flowing on the side of the vehicle body enters the rear wheel house 12. In order not to enter, the side flow is once directed to the outside of the vehicle and then deflected so as to reattach to the outer surface of the tire wheel.

  Here, as shown in FIG. 5, the rear wheel house 12 described above is formed by joining and fixing a wheel house outer 12 </ b> A and a wheel house inner 12 </ b> B, and the rear wheel 11 of the rear wheel house 12. A wheel house mudguard 12C is disposed on the surface on the opposite side.

  As shown in FIG. 5, the floor panel 18 that forms the bottom of the passenger compartment and the cargo compartment is formed by continuously forming a front floor panel, a rear seat pan, and a rear floor panel including a cargo compartment recess in the vehicle front-rear direction. is there.

  As shown in FIG. 2, the above-described side sill 15 extending in the vehicle front-rear direction from the above-described front floor panel to the middle portion in the front-rear direction of the rear seat pan is joined and fixed to the side portion in the vehicle width direction of the floor panel 18.

  As shown in FIGS. 2 and 5, a rear side frame 19 extending in the vehicle front-rear direction from the middle part in the front-rear direction of the rear seat pan to the rear end of the rear floor panel is provided. As shown in FIG. 5, the rear side frame 19 includes a rear side frame upper 20 and a rear side frame lower 21. Between the rear side frame upper 20 and the rear side frame lower 21, a vehicle front-rear direction is provided. An extending rear side frame closed section S1 is formed.

  As shown in FIG. 2, a rear cross member 22 extending in the vehicle width direction is horizontally mounted between the pair of left and right rear side frames 19, 19 at a position corresponding to the rear of the center portion of the rear wheels 11, 11. A cross member 22 connects the pair of left and right rear side frame lowers 21 and 21 in the vehicle width direction.

On the other hand, as shown in FIG. 2, an exhaust pipe 30 (so-called exhaust pipe) that guides exhaust gas discharged from the exhaust port and exhaust manifold of the engine to the rear of the vehicle is provided in the tunnel portion at the lower part of the floor. The exhaust pipe 30 is provided with a catalytic converter 31, and a silencer 32 as a silencer is connected to the rear end of the exhaust pipe 30 extending to the rear position of the rear cross member 22. On both the left and right sides, L-shaped tail pipes 33, 33 extending in the vehicle width direction and then extending rearward of the vehicle are attached.
The space between the outer side in the front vehicle width direction of the silencer 32 and the corner portion of the tail pipe 33 is covered with a rectifying cover 34 from below.

As shown in FIG. 2, floor undercovers 35 and 36 for rectification that cover the lower surface of the vehicle body except for the tunnel portion are provided. Each of the pair of left and right floor undercovers 35 and 36 has a flat rectifying surface on the bottom surface.
Further, these floor undercovers 35, 36 are formed such that a front floor undercover 35 and a rear floor undercover 36 are continuous in the vehicle front-rear direction.

As shown in FIG. 2, a torsion beam type rear suspension 40 for suspending a pair of left and right rear wheels 11, 11 is provided.
The rear suspension 40 includes a pair of left and right trailing arms 41, 41 extending in the vehicle front-rear direction, and a torsion beam 42 (torsion bar spring) that extends and connects the trailing arms 41, 41 in the vehicle width direction. I have.

As shown in FIG. 5, the torsion beam 42 described above is formed in an internal hollow closed cross-sectional structure.
Further, as shown in the figure, the above-described trailing arm 41 is formed in a closed cross-sectional structure by joining and fixing a trailing arm outer 43 and a trailing arm inner 44.

  A lower spring seat (not shown) joined and fixed to both the inner side in the vehicle width direction of the trailing arm 41 and the rear surface portion of the torsion beam 42, and an upper portion fixed to the lower surface of the rear side frame lower 21 in the rear side frame 19 A coil spring 46 as a suspension spring is stretched between the spring seat 45 and the spring seat 45.

  Further, as shown in FIGS. 4 and 5, a damper 47 is provided between the rear end side upper part of the above-described trailing arm 41 and the vehicle body side (a damper mounting part at the upper part of the wheel arch in the rear wheel house 12). Is stretched.

As shown in FIGS. 2 and 3, a plate-like rectifying arm cover 50 that covers the trailing arm 41 from below is attached to the lower portion of the trailing arm 41 as viewed from the bottom of the vehicle body.
Here, the floor undercovers 35 and 36 described above are rectifying covers that cover the lower surface of the vehicle body from below in front of the rear suspension 40.

  As shown in FIGS. 5, 6, and 7 (a), the above-described arm cover 50 uses a mounting member such as bolts 51, 52, and 53 and a bracket, and a lower surface or lower spring of the trailing arm 41. The arm cover 50 is attached to the lower surface of the seat so that the arm cover 50 is displaced together with the trailing arm 41.

  The above-described bolt 51 is positioned on the outer side in the front vehicle width direction of the arm cover 50, the bolt 52 is positioned on the middle in the front-rear direction and on the inner side in the vehicle width direction of the arm cover 50, and the bolt 53 is positioned in the rear vehicle width direction of the arm cover 50. Located outside.

As shown in FIGS. 6 and 7A, when the above-described bolts 51, 52, 53 are used as attachment members, the heads of these bolts 51, 52, 53 are the lower surface of the arm cover 50, that is, The bolts 51, 52, and 53 disposition portions are formed in concave portions 54, 55, and 56 that are recessed upward so as not to protrude downward from the rectifying surface.
On the other hand, as shown in FIG. 5, the rear wheel 11 includes a rim 11R and a tire 11T.

  As shown in FIGS. 3, 6, and 7 (a), the arm cover 50 described above includes an extension portion 50 </ b> A whose outer edge in the vehicle width direction enters the rim 11 </ b> R of the rear wheel 11 when the vehicle body is viewed from below.

  As shown in FIG. 6, in this embodiment, the above-described extension portion 50A has entered the rim 11R to a position that is approximately 18 to 20% of the rim width, but this amount of entry is limited to the above numerical value. is not.

  As a result, as shown in FIG. 7A, the above-mentioned arm cover 50 blocks the underfloor traveling wind (see the thick arrow in the same figure) from rising into the rear wheel house 12, and the above mentioned arm cover 50. After reattaching to the arm cover 50, the arm cover 50 moves rearward along the arm cover 50, and rises from the outer edge of the arm cover 50 in the vehicle width direction into the rear wheel 11 (particularly, the rim 11R) to enter. The flow is suppressed by the above-described extension portion 50A, and the flow into the rear wheel 11 is suppressed, so that the turbulence of the wake of the vehicle body is suppressed.

  FIG. 7B is a bottom perspective view showing the flow of the underfloor traveling wind of the comparative example, and for convenience of explanation, the same reference numerals as those of the embodiment shown in FIG. In FIG. 7A, phantom lines β1 and β2 indicate the shapes of the comparative example (see FIG. 7B), and in FIG. 7B, phantom lines α1 and α2 indicate the embodiment (see FIG. 7). The shape of (a) is shown.

  In contrast to the configuration of the embodiment shown in FIG. 7A, when the extension 50A does not exist in the arm cover 50 as shown in the comparative example in FIG. As shown, the underfloor traveling wind that flows along the under cover 50 is sucked out by the side flow of the vehicle body having a high flow velocity, and thus enters the rim 11R of the rear wheel 11 from the outer edge in the vehicle width direction of the under cover 50. A flow that rises and enters is generated. On the other hand, in the embodiment shown in FIG. 7A, the flow that rises and enters the rear wheel 11 from the outer edge of the arm cover 50 in the vehicle width direction can be suppressed by the above-described extension portion 50A. It is.

  As shown in FIG. 5, the extension portion 50 </ b> A of the arm cover 50 protrudes outward in the vehicle width direction from the trailing arm outer 43 of the trailing arm 41 when the vehicle body is viewed from below.

  As shown in FIG. 6, the rear end portion 36 a of the floor under cover 36 located in front of the front edge 50 a of the extension portion 50 </ b> A of the arm cover 50 described above is opposed to and close to the vehicle in the vehicle front-rear direction. The floor under cover 36 is formed with a floor under cover extension 36A.

  The gap between the lower wheel housing 12 and the rear wheel house 12 is communicated between the extension portion 50A of the arm cover 50 and the floor under cover extension portion 36A (that is, the inner edge of the tire 11T of the rear wheel 11 and the floor). The gap between the rear end portion 36a of the undercover 36 and the front end portion 51a of the arm cover 50 is reduced, and the entry of the underfloor wind into the rear wheel house 12 is suppressed. It is configured to suppress the flow turbulence.

  Further, as shown in the bottom view of FIG. 6, the rear end side 36b of the floor under cover 36 and the front end side 50b of the arm cover 50 are opposed to and parallel to each other when viewed from the bottom of the vehicle body. The rear outer edge 36c of the rear end portion of the extension 36A of the floor under cover 36 and the outer outer edge 50c of the front end portion of the extension 50A of the arm cover 50 are enveloped in the tire 11T of the rear wheel 11. The front wheel 11 is formed so as to bypass the front inner surface of the tire 11T of the rear wheel 11 and continue in the vehicle front-rear direction.

  Thus, the underfloor traveling wind passing along the lower surface of the floor under cover 36 flows up into the wheel house 12 after the floor under cover 36 is finished, and the floor under cover 36 and the arm cover 50 It is configured to prevent it by cooperation.

  As shown in FIGS. 5 and 6, the extension portion 50 </ b> A of the arm cover 50 described above is a cantilever projecting toward the rim 11 </ b> R side of the rear wheel 11 from the vehicle outer side end portion of the trailing arm outer 43 of the trailing arm 41. A vertical wall portion 50d extending upward is provided on the outer edge in the vehicle width direction of at least the extension portion 50A of the arm cover 50.

In this embodiment, as shown in FIG. 5, a vertical wall portion 50e extending upward is also provided at the inner edge in the vehicle width direction of the arm cover 50 described above. Here, the above-described arm cover 50 is formed of a synthetic resin such as polypropylene, and the above-described vertical wall portions 50d and 50e are formed integrally with the arm cover main body.
Thereby, even if the extension part 50A of the arm cover 50 described above has a cantilever structure, the vertical wall part 50d is configured to ensure the strength of the arm cover 50.

  In the figure, 60 is a rear under cover for rectifying the bottom surface of the silencer 32 and the bottom surface of the rear bumper face 14, 61 is a fuel tank, and 62 is interposed between the silencer 32 and the floor panel 18 side. Insulator for preventing heat damage.

In the figure, arrow F indicates the front of the vehicle, arrow R indicates the rear of the vehicle, arrow IN indicates the inner side in the vehicle width direction, arrow OUT indicates the outer side in the vehicle width direction, and arrow UP indicates the upper side of the vehicle. Indicates.
Further, in the above-described embodiment, the left side structure of the vehicle is exemplified as the vehicle body bottom surface structure, but the right side structure of the vehicle is formed in the same manner as that on the left side of the vehicle.

  As described above, the vehicle body lower surface structure of the above embodiment includes the torsion beam type rear suspension 40 including the pair of left and right trailing arms 41 and the torsion beam 42 connecting them, and covers the vehicle body lower surface in front of the rear suspension 40. The undercarriage structure of the vehicle body is provided with a rectifying floor under cover 36, and a plate-like rectifying arm cover 50 is attached to the lower portion of the trailing arm 41 so as to cover the underside of the vehicle body as viewed from the underside of the vehicle body. Is provided with an extension 50A whose outer edge in the vehicle width direction enters the rim 11R of the rear wheel 11 when the vehicle body is viewed from below (see FIGS. 3, 6, and 7A).

  According to this configuration, the underfloor wind (so-called under-floor flow) is prevented from rising and entering the rear wheel house 12 by the arm cover 50 and moving rearward along the arm cover 50. The flow that rises and enters the rear wheel 11 from the outer edge of the arm cover 50 in the vehicle width direction can be suppressed by the extension portion 50A, thereby suppressing the turbulence of the vehicle body wake.

  In one embodiment of the present invention, the rear end side 36b of the floor under cover 36 and the front end side 50b of the arm cover 50 are disposed in close proximity to each other when viewed from the bottom of the vehicle body. The rear outer edge 36c of the rear end portion and the outer outer edge 50c of the front end portion of the arm cover 50 bypass the front inner surface of the rear wheel 11 and continue in the vehicle front-rear direction (see FIGS. 3 and 6). ).

  According to this configuration, the wind passing along the lower surface of the floor under cover 36 is prevented in cooperation with the arm cover 50 from flowing up into the wheel house 12 after the floor under cover 36 is finished. can do.

  In one embodiment of the present invention, the extension portion 50A is configured in a cantilever shape projecting toward the rim 11R side of the rear wheel 11 from the vehicle outer end portion of the trailing arm 41, and the arm cover 50 is A vertical wall portion 50d extending upward is provided at least on the outer edge of the extension portion 50A in the vehicle width direction (see FIG. 5).

  According to this configuration, even if the extension portion 50A of the arm cover 50 has a cantilever structure, the strength of the arm cover 50 can be secured by the vertical wall portion 50d.

  As described above, the present invention includes a torsion beam type rear suspension including a pair of left and right trailing arms and a torsion beam connecting them, and a floor undercover for rectification covering the lower surface of the vehicle body is provided in front of the rear suspension. This is useful for the mounted underbody structure.

11. Rear wheel 11R ... Rim 36 ... Floor under cover 40 ... Rear suspension 41 ... Trailing arm 42 ... Torsion beam 50 ... Arm cover 50A ... Extension 50d ... Vertical wall

Claims (3)

It has a torsion beam type rear suspension consisting of a pair of left and right trailing arms and a torsion beam connecting them,
A vehicle body lower surface structure in which a rectifying floor under cover for covering the vehicle lower surface is attached to the front of the rear suspension,
A plate-like rectifying arm cover is attached to the lower part of the trailing arm to cover the lower surface of the vehicle body,
The vehicle body lower surface structure characterized in that the arm cover includes an extension part whose outer edge in the vehicle width direction enters the rim of the rear wheel as viewed from the lower surface of the vehicle body. The rear end side of the floor under cover and the front end side of the arm cover face each other in close proximity when viewed from the bottom of the vehicle body,
2. The rear outer side outer edge of the floor under cover and the outer outer edge of the front end of the arm cover bypass the front inner side surface of the rear wheel and continue in the vehicle front-rear direction. The vehicle body bottom structure as described. The extension portion is configured in a cantilever shape projecting toward the rim side of the rear wheel from the vehicle outer side end portion of the trailing arm,
The vehicle body lower surface structure according to claim 1 or 2, wherein a vertical wall portion extending upward is provided at an outer edge in the vehicle width direction of at least the extension portion of the arm cover.

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