JP6451787B2 - Car undercover mounting structure - Google Patents

Description

  The present invention relates to an undercover mounting structure for an automobile in which an undercover is mounted on a lower surface of a vehicle from a kick-up portion in front of a fuel tank to a position immediately before an exhaust silencer disposed below a cargo floor.

In general, it is known to provide an under cover on the lower surface of a vehicle to rectify the underfloor traveling wind to improve aerodynamic performance.
If the above-mentioned under cover is provided from the kick-up part in front of the fuel tank to the position immediately before the exhaust silencer arranged below the cargo floor, the aerodynamic performance is improved along with the expansion of the rectification range of the underfloor running wind, While it is possible to achieve both improvement, the length of the undercover in the vehicle front-rear direction becomes long, and sufficient rigidity cannot be ensured only with the undercover.
Therefore, it is conceivable to provide a frame material that supports the undercover to the vehicle body. However, when the frame material is increased in size, there is a concern that the weight significantly increases.

  By the way, Patent Document 1 discloses a structure in which a reinforcing frame having a hat cross-sectional shape extending in the vehicle front-rear direction is integrally attached to the upper surface of the under cover, and the under cover is attached to the vehicle body via the reinforcing frame. However, since the length in the vehicle front-rear direction of the pair of reinforcing frames positioned on the left and right of the upper surface of the undercover is long, there is room for improvement in terms of securing the supporting rigidity of the reinforcing frame to the vehicle body.

JP 2009-286157 A

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an undercover mounting structure for an automobile that can secure the supporting rigidity of the undercover and the reinforcing member while reducing the weight of the reinforcing member.

An undercover mounting structure for an automobile according to the present invention is an undercover mounting structure for an automobile in which an undercover is attached to the lower surface of a vehicle over a position immediately before an exhaust silencer disposed below a cargo floor from a kick-up portion in front of a fuel tank. A reinforcing member is provided on the upper surface side of the under cover, extending from the front end of the under cover to the rear end of the under cover, and attached to the strength member of the vehicle body at both front and rear end positions. comprising a short intermediate support member from the reinforcing member to be attached to the vehicle body member located in the vehicle width direction side, the under cover is one that is supported by the reinforcing member.

  According to the above-described configuration, it is possible to secure the support rigidity of the undercover and the reinforcing member by reducing the weight of the reinforcing member and reinforcing the reinforcing member having a long front and rear length with the intermediate support member.

  In an embodiment of the present invention, the vehicle body member located on the side in the fuel tank vehicle width direction is a suspension support member extending from the rear side frame toward the vehicle lower side.

According to the above configuration, since the suspension support member described above extends from the rear side frame toward the vehicle lower side, the length of the intermediate support member can be shortened as much as possible.
Further, the suspension support member can be reinforced by the intermediate support member, and the fuel tank can be protected by the intermediate support member when a side collision load is input.

  In one embodiment of the present invention, a second reinforcing member whose front end is supported by the fuel tank is provided in parallel with the reinforcing member, and a midway portion in the vehicle longitudinal direction of the second reinforcing member is used as the reinforcing member. It has a connecting part to be connected.

  According to the said structure, the support rigidity improvement of a 2nd reinforcement member can be aimed at in the above-mentioned connection part.

  In one embodiment of the present invention, the rear end of the reinforcing member and the second reinforcing member are connected, and a rear end supporting member supported by the vehicle body is provided.

  According to the above configuration, it is possible to achieve both the improvement of the supporting rigidity of the rear end of the reinforcing member and the second reinforcing member and the improvement of the mounting strength of these members to the vehicle body.

  In an embodiment of the present invention, the rear end of the reinforcing member is connected to an undercover portion adjacent to the rear end of the reinforcing member, and a rear end supporting member supported by the vehicle body is provided.

  According to the said structure, the support rigidity improvement of an undercover rear end can be aimed at.

  In an embodiment of the present invention, the rear end support member is provided with an opening and a reinforcing bead extending in the vertical direction.

  According to the above configuration, the rigidity of the rear end support member can be maintained with the reinforcing bead while reducing the weight of the rear end support member at the opening.

  In one embodiment of the present invention, an exhaust pipe is provided in the vicinity of the fuel tank, and a heat insulator is provided between the fuel tank and the exhaust pipe, and the heat insulator overlaps with the under cover. The heat insulator is supported by the mounting portion of the under cover at the overlap portion.

  According to the said structure, the heat leak from the overlap part of an undercover and a heat insulator can be suppressed.

  According to the present invention, there is an effect that it is possible to ensure the supporting rigidity of the under cover and the reinforcing member while reducing the weight of the reinforcing member.

Bottom view showing the undercover mounting structure of an automobile Bottom view of undercover mounting structure with solid lines showing left and right undercovers and heat insulator The perspective view which shows the reinforcement member unit in the state seen from diagonally upward of the vehicle Bottom view of reinforcing member unit Bottom view of heat insulator The perspective view which shows the attachment structure of the intermediate support member of the vehicle left side The perspective view which shows the attachment structure of the intermediate support member of the vehicle right side FIG. 2 is a cross-sectional view taken along the line AA in FIG. FIG. 2 is a cross-sectional view of the main part along the line BB in FIG. FIG. 2 is a cross-sectional view of the main part along the line CC in FIG. FIG. 2 is a cross-sectional view of the main part along the line DD in FIG.

The purpose of reducing the weight of the reinforcement member and ensuring the support rigidity of the undercover and the reinforcement member is to cover the underside of the vehicle from the kick-up portion in front of the fuel tank to the position just before the exhaust silencer located below the cargo floor. An undercover mounting structure for an automobile to which is attached, a reinforcing member that extends from the front end of the undercover to the rear end of the undercover and that is attached to the strength member of the vehicle body at both front and rear positions is provided on the upper surface side of the undercover. the middle portion of the vehicle front-rear direction of the reinforcing member, comprises a short intermediate support member from the reinforcing member to be attached to the vehicle body member located on the fuel tank vehicle width direction side, the configuration of the under cover is Ru is supported on the reinforcing members Realized.

An embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a bottom view of the undercover mounting structure in which the left and right undercovers are shown in phantom lines, and FIG. 2 is an undercover mounting structure in which the left and right undercovers and the heat insulator are shown by solid lines. 3 is a perspective view showing the reinforcing member unit as viewed obliquely from above the vehicle, FIG. 4 is a bottom view of the reinforcing member unit, and FIG. 5 is a bottom view of the heat insulator.

  6 is a perspective view showing the attachment structure of the intermediate support member on the left side of the vehicle as viewed from the lower front of the vehicle, and FIG. 7 shows the attachment structure of the intermediate support member on the right side of the vehicle as viewed from the lower front of the vehicle. It is a perspective view shown.

  8 is a cross-sectional view taken along the line AA in FIG. 2, FIG. 9 is a cross-sectional view taken along the line BB in FIG. 2, and FIG. 10 is a cross-sectional view taken along the line C-- in FIG. FIG. 11 is a cross-sectional view of the main part along the line C, and FIG. 11 is a cross-sectional view of the main part along the line DD in FIG.

As shown in FIGS. 1, 9, and 11, a floor panel 1 that forms a floor surface of a passenger compartment is provided, and the floor panel 1 projects in the vehicle interior in the vehicle width direction center and extends in the vehicle front-rear direction. The tunnel portion 2 is integrally or integrally formed, and tunnel members 3 and 3 extending in the vehicle front-rear direction along the tunnel portion 2 are bonded and fixed to the lower left and right sides of the tunnel portion 2. A closed cross section extending in the vehicle longitudinal direction is formed between the lower portion of the tunnel portion 2.
As shown in FIGS. 1, 2, 6, and 7, side sill inner sections 4 and side sill outers 5 are joined and fixed to the left and right side portions of the floor panel 1 described above, and side sill closed sections extending in the vehicle front-rear direction are provided. The provided side sill 6 is provided.

  As shown in FIGS. 9 and 11, a kick-up portion 9 that rises upward from the rear end of the floor panel 1 to the front end of the rear floor 8 is provided in front of the fuel tank 7 and extends rearward from the upper end of the kick-up portion 9. As described above, the rear floor 8 is continuously provided.

  A front portion of the rear floor 8 is set to a rear seat pan 10, and the fuel tank 7 is disposed below the rear seat pan 10 as shown in FIGS. 9 to 11. On the other hand, the rear portion of the rear floor 8 is set as a cargo compartment floor, and as shown in FIGS. 1 and 2, an exhaust silencer 11 as an exhaust silencer is disposed below the cargo compartment floor.

  As shown in FIGS. 6, 7, and 8, the left and right sides of the above-described rear floor 8 are provided with rear side closed cross sections 14 that are joined and fixed to the rear side frame upper 12 and the rear side frame lower 13 to extend in the vehicle front-rear direction. A rear side frame 15 is provided.

  As shown in FIG. 1, the front end portion of the rear side frame 15 is provided so as to overlap the rear end portion of the side sill 6, while the rear end of the rear side frame 15 is provided at the rear end of the rear side frame 15 as shown in FIGS. A set plate 16 for attaching the crash can is provided.

  As shown in FIGS. 9, 10, and 11, a cross member 17 (so-called No. 3) extending in the vehicle width direction is formed between the rear surface of the kick-up portion 9 in the vertical direction and the lower surface of the front end portion of the rear floor 8. A cross member closed section 18 is formed between the cross member 17 and the opposing member.

  As shown in the figure, a cross member upper 19 and a cross member lower 20 (so-called No. 4) extending in the vehicle width direction are provided on the upper and lower surfaces of the rear floor 8 at positions separated from the cross member 17 on the vehicle rear side. A cross member closed section 21 extending in the vehicle width direction is formed between the cross member upper 19 and the rear floor 8, and the cross member lower 20 and the rear floor 8 are also formed in the vehicle width direction. An extending cross member closed section 22 is formed, and the upper and lower cross member closed sections 21 and 22 are overlapped in the vertical direction.

A rear cross member 23 (so-called No. 4.5 cross member) that extends in the vehicle width direction is attached to the lower surface portion of the rear floor 8 at a position further away from the cross member lower 20 on the vehicle rear side. A rear cross member closed section 24 extending in the vehicle width direction is formed between the rear cross member 23 and the rear floor 8 described above.
Here, the cross member 17, the cross member upper 19, the cross member lower 20, and the rear cross member 23 described above are all vehicle body strength members that connect the left and right rear side frames 15 in the vehicle width direction.

  Incidentally, the left and right rear wheels 25, 25 (see FIG. 2) of this embodiment are suspended by a torsion beam type rear suspension.

  As shown in FIG. 1, the torsion beam type rear suspension includes left and right trailing arms 26, 26 and a torsion beam 27 that connects the left and right trailing arms 26, 26 in the vehicle width direction. 26 is supported by a suspension support member 28 that is L-shaped in bottom view and extends from the rear side frame 15 toward the vehicle lower side.

  As shown in FIGS. 6 and 7, the suspension support member 28 described above is joined to the side wall 13 a on the inner side in the vehicle width direction of the rear side frame lower 13, the vertical wall 28 a extending downward from the side wall 13 a, and the rear side frame lower 13. A front wall 28b joined to the lower wall 13b and extending downward from the lower wall 13b. The vertical wall 28a and the front wall 28b are integrally connected in an L shape in a bottom view, and The outer end 28c in the vehicle width direction of the wall 28b is joined and fixed to the side sill inner 4. As shown in FIG. 1, these suspension support members 28 are positioned on the side of the fuel tank 7 in the vehicle width direction. It is a vehicle body member. In FIGS. 6 and 7, reference numeral 29 denotes a trailing bush.

  An engine is mounted in an engine room formed in front of a dash lower panel (not shown), and an exhaust port of the engine extends through the exhaust manifold and below the floor panel 1 to the rear of the vehicle. An exhaust path 30 (see FIGS. 1 and 2) is connected in communication.

  As shown in FIGS. 1 and 2, the exhaust path 30 described above connects the catalytic converter 31 located in the tunnel portion 2, the downstream of the catalytic converter 31, and the upstream of the exhaust silencer 11 described above, and a fuel tank. 7 and an exhaust pipe 32 disposed close to the lower surface recess 7a.

In this embodiment, as shown in FIGS. 1 and 2, the exhaust pipe 32 is bent from the downstream end of the catalytic converter 31 to the right outside in the vehicle width direction and then upstream of the exhaust silencer 11 as viewed from the bottom of the vehicle. On the side, it is formed in a bent shape that returns to the center in the vehicle width direction again.
The exhaust silencer 11 is connected to a pair of tail pipes 33, 33 that are bent in an L shape from both outer ends of the exhaust silencer 11 in the vehicle width direction and extend rearward of the vehicle.

  As shown in FIG. 2, a heat insulator 34 is provided between the lower part of the fuel tank 7 and the upper part of the exhaust pipe 32, and heat of the exhaust pipe 32 is transmitted to the fuel tank 7 by the heat insulator 34. It is configured to suppress this.

  As shown in FIGS. 2 and 5, the heat insulator 34 extends in the front-rear direction of the vehicle from the rear part of the catalytic converter 31 to a position just before the torsion beam 27, and is provided with a lower surface recess 7 a (see FIG. 1) and an exhaust of the fuel tank 7. The lower surface recess 34a corresponding to the bent shape of the tube 32 is provided.

As shown in FIGS. 5 and 10, another heat insulator 35 extending from the upper side of the rear portion to the upper side of the vehicle is provided at the rear portion of the heat insulator 34, and the rear portion of the fuel tank 7 is moved by the heat insulator 35. It is configured so as to prevent heat damage to the fuel tank 7 by being spaced apart.
As shown in FIG. 5, the two heat insulators 34 and 35 are formed so as to be connected by joint fastening portions 36 and 37.

  As shown in FIGS. 1 and 2, a rectifying cover 38 that covers the rear end of the trailing arm 26 from below is provided. Further, a rectifying cover 39 is provided at the outer end of the exhaust silencer 11 in the vehicle width direction and at the front of the tail pipe 33. The lower surface of the exhaust silencer 11 is formed in a flat shape, and the lower surfaces of the above-described covers 38 and 39 are formed in a flat shape. Together with the undercovers 40 and 50 described later, these elements 38, 39 and 11 are also configured to rectify the underfloor traveling wind.

  As shown in FIGS. 1 and 2, the vehicle extends from the kick-up portion 9 in front of the fuel tank 7 (in this embodiment, further forward of the kick-up portion 9) to the position immediately before the exhaust silencer 11 disposed below the cargo compartment floor. Undercovers 40 and 50 are attached to the lower surface, and these undercovers 40 and 50 are configured to rectify the underfloor traveling wind over a wide range.

The undercovers 40 and 50 are made of compressed PET (Polyethylene terephthalate) fibers for the purpose of reducing the weight. Further, each of the under covers 40 and 50 is formed in a substantially flat shape over the entire lower surface thereof as shown in FIGS. 8 to 11 in order to ensure the rectification property of the underfloor traveling wind.
The above-described under covers 40 and 50 are formed in a left and right divided structure so as to avoid the exhaust pipe 32.

As shown in FIG. 2, the under cover 40 on the left side of the vehicle includes a plurality of attachment portions 41, 42, 43 to the vehicle body, and attachment portions 44, 45 to a rear end support member 67 described later.
Of the attachment parts 41 to 43 to the vehicle body, the attachment parts 41 and 42 at the front end part are attached to the floor panel 1 side, and the attachment part 43 at the middle outer side in the vehicle front-rear direction is attached to the side sill inner 4.

As shown in FIG. 2, the under cover 50 on the right side of the vehicle includes mounting portions 51, 52, 53 for a plurality of vehicle bodies, and mounting portions 54, 55 for a rear end support member 68 described later.
Of the attachment parts 51 to 53 to the vehicle body, the attachment parts 51 and 52 at the front end part are attached to the floor panel 1 side, and the attachment part 53 at the intermediate outer side in the vehicle front-rear direction is attached to the side sill inner 4.

As shown in FIGS. 1 and 2, a reinforcing member unit 60 that supports the undercovers 40, 50 is provided between the upper surfaces of the undercovers 40, 50 and the vehicle body.
The reinforcing member unit 60 extends from the front end of the undercovers 40, 50 to the rear end of the undercovers 40, 50 as shown in a perspective view from above in FIG. 3 and a bottom view in FIG. A pair of left and right reinforcing members 61, 62 attached to the strength member of the vehicle body at both end positions, and extending outward from the middle of the vehicle longitudinal direction of each of the reinforcing members 61, 62 in the vehicle width direction and shorter than the reinforcing members 61, 62 Intermediate support members 63, 64, a second reinforcement member 65 that extends in the front-rear direction of the vehicle in parallel with the left side reinforcement member 61, and whose front end is supported by the fuel tank 7, and the vehicle of the second reinforcement member 65 A connecting member 66 as a connecting portion for connecting the midway portion in the front-rear direction and the corresponding position of the reinforcing member 61 in the vehicle width direction, and the rear ends of the reinforcing member 61 on the left side of the vehicle and the second reinforcing member 65 are connected to each other in the vehicle width. And the rear lower end support member 67 supported by the vehicle body and the rear end of the reinforcing member 62 on the right side of the vehicle are connected to the lower portion in the vehicle width direction and from the connection portion to the inner side in the vehicle width direction. A rear end support member 68 that extends and has an upper portion supported by the vehicle body.

  As shown in FIG. 6, the intermediate support member 63 on the left side of the vehicle has a mounting piece 63 a on the outside in the vehicle width direction. The mounting piece 63 a uses a mounting member 69 such as a bolt or a nut, and the fuel tank 7. Is attached to a front wall 28b of a suspension support member 28 as a left-side vehicle body member located on the side in the vehicle width direction.

  As shown in FIG. 7, the intermediate support member 64 on the right side of the vehicle has a mounting piece 64 a on the outside in the vehicle width direction. The mounting piece 64 a uses a mounting member 70 such as a bolt and a nut to attach the fuel tank 7. Is attached to a front wall 28b of a suspension support member 28 as a right body member located on the side in the vehicle width direction.

As shown in FIGS. 6 and 7, the pair of left and right reinforcing members 61 and 62, the second reinforcing member 65, and the connecting member 66 are all formed in a gate shape in cross section for the purpose of achieving light weight and high rigidity. ing.
As shown in FIG. 1, the front end portions of the pair of left and right reinforcing members 61 and 62 are attached to the floor panel 1 immediately before the kick-up portion 9, and these reinforcing members 61 and 62 and the second reinforcing member 65 are attached. The rear end portion is attached to the lower wall portion of the rear cross member 23 via the rear end support members 67 and 68.

  That is, as shown in FIGS. 3 and 4, the rear end support member 67 on the left side of the vehicle extends in the vehicle width direction and the vertical direction. The rear end support member 67 has two rear end support members 67 aligned in the vehicle width direction. Openings 71 and 72 are formed, and a plurality of mounting holes 73... Are formed in the upper end bent pieces 67 a and 67 b extending rearward from the upper end of the rear end support member 67. The upper end bent pieces 67a and 67b are attached to the lower wall portion of the rear cross member 23 using bolts and nuts inserted into the rear cross member 23 (see FIG. 6).

  Similarly, as shown in FIGS. 3 and 4, the rear end support member 68 on the right side of the vehicle extends in the vehicle width direction and the vertical direction. The rear end support member 68 has an opening 74 formed therein. A plurality of attachment holes 75 are formed in the upper end bent pieces 68a, 68b extending rearward from the upper end of the rear end support member 68, and bolts and nuts inserted into these attachment holes 75 are used. The upper bent pieces 68a and 68b are attached to the lower wall portion of the rear cross member 23 (see FIG. 7).

  As shown in FIG. 3, bent pieces 67 c and 67 d extending forward of the vehicle are integrally formed on both sides in the vehicle width direction of the rear end support member 67 on the left side of the vehicle, and the vehicle is also formed at the lower end of the rear end support member 67. A bent piece 67e extending forward is integrally formed, and the bent piece 67e is connected and fixed to the rear ends of the reinforcing members 61 and 65 using bolts and nuts 76 and 77 (see FIG. 4). Further, as shown in FIG. 3, the rear end support member 67 is integrally formed with a plurality of reinforcing beads 78 extending in the vertical direction.

  As shown in FIG. 3, folding pieces 68c and 68d extending forward of the vehicle are integrally formed on both sides in the vehicle width direction of the rear end support member 68 on the right side of the vehicle, and the vehicle is also formed at the lower end of the rear end support member 68. A bent piece 68e extending forward is integrally formed, and the bent piece 68e is connected and fixed to the rear end of the reinforcing member 62 using bolts and nuts 79 (see FIG. 4). Further, as shown in FIG. 3, a plurality of reinforcing beads 80 extending in the vertical direction are integrally formed on the rear end support member 68.

  As shown in FIG. 3, the reinforcing beads 78, 80 integrally formed on the left and right rear end support members 67, 68 are located above the rear end support members 67, 68, respectively. Corresponding to the folding direction of 67b, 68a, 68b, it bulges toward the rear of the vehicle, and the one located below the rear end support members 67, 68 is the folding of the folding pieces 67e, 68e on the lower end side. Corresponding to the direction, it bulges forward in the vehicle.

  Further, as shown in FIGS. 3, 6, and 7, the mouth portions of the openings 71, 72, and 74 formed in the rear end support members 67 and 68 described above are directed to the vehicle front side. The bulging annular bulging portions 71a, 72a, 74a are integrally formed, and combined with the formation of the bent pieces 67a-67e, 68a-68e, the rear end support members 67, 68 are lightweight and highly rigid. It is configured to plan.

  By the way, the above-described heat insulator 34 is provided so as to overlap the inner side in the vehicle width direction of the undercovers 40 and 50 as shown in FIGS. 2, 10 and 11. In OL2, the heat insulator 34 is supported on the attachment portion of the undercovers 40, 50.

  In FIG. 10, which is a cross-sectional view taken along the line CC of FIG. 2, the attachment portion of the under cover 40 is a retainer 81 formed integrally or integrally with the lower surface of the rear portion of the fuel tank 7. The part is a specific retainer 82 joined and fixed to the lower surface of the reinforcing member 62 in FIG. The retainer 82 is formed in a hat cross-sectional shape in the reverse direction.

  In the overlap portion OL1 shown in FIG. 10, four members, ie, a lower end of the heat insulator 35, a front end of the second reinforcing member 65, the heat insulator 34, and the under cover 40 are connected to a retainer 81, that is, a fuel, using bolts and nuts 83. The lower part of the tank 7 is integrally supported.

  In the overlap portion OL2 shown in FIG. 11, the two members of the heat insulator 34 and the under cover 50 are integrally supported by the reinforcing member 62 via the retainer 82 using bolts and nuts 84.

  As shown in FIGS. 9, 10, and 11, the rear end support members 67 and 68 described above include the rear ends of the reinforcing members 61 and 62 and the second reinforcing member 65, and the rear of the reinforcing members 61, 62, 65. The connecting portions 44, 45, 54, 55 (see FIG. 2) of the undercovers 40, 50 adjacent to the ends are connected, and the upper ends thereof are supported by the vehicle body (see the rear cross member 23).

  As shown in FIG. 4, a plurality of retainers 85 are joined and fixed to the lower surface of the pair of left and right reinforcing members 61 and 62 and the lower surface of the connecting member 66, in addition to the specific retainer 82, as shown in FIG. As shown in FIGS. 9 and 11, the undercovers 40 and 50 are attached to and supported by the plurality of retainers 85 using bolts and nuts 86 (attachment members). The plurality of retainers 85 are formed in a hat cross-sectional shape in the reverse direction.

  In FIG. 1, reference numeral 91 denotes a floor frame that is joined and fixed to the lower surface of the floor panel 1 and extends in the vehicle front-rear direction, and 92 is a tank band for supporting the fuel tank 7 on the vehicle body. In the figure, arrow F indicates the front of the vehicle, arrow R indicates the rear of the vehicle, arrow UP indicates the upper side of the vehicle, and arrow OUT indicates the outward in the vehicle width direction.

  As described above, the undercover mounting structure for an automobile according to the above embodiment extends from the kick-up portion 9 in front of the fuel tank 7 to the lower surface of the vehicle over the position immediately before the exhaust silencer 11 disposed below the cargo floor (see the rear portion of the rear floor 8). An undercover mounting structure for an automobile to which an undercover 40, 50 is mounted, which extends from the front end of the undercover 40, 50 to the rear end of the undercover 40, 50 on the upper surface side of the undercover 40, 50, And a pair of left and right reinforcing members 61 and 62 attached to the strength member of the vehicle body (specifically, refer to the floor panel 1 and the lower wall portion of the rear cross member 23 immediately before the lower end of the kick-up portion 9). A vehicle body member (suspension) located in the vehicle width direction side of the fuel tank 7 in the vehicle longitudinal direction of the members 61 and 62 In which with an intermediate support members 63, 64 is shorter than the reinforcing member 61 and 62 attached to the reference support member 28) (FIGS. 1, 2, 6, see Fig. 7).

  According to this configuration, while reducing the weight of the reinforcing members 61 and 62, the reinforcing members 61 and 62 having a long front and rear length are reinforced by the intermediate support members 63 and 64, and the undercovers 40 and 50 and the reinforcing members 61 and 62 are thereby strengthened. It is possible to ensure the supporting rigidity.

  In one embodiment of the present invention, the vehicle body member located on the side of the fuel tank 7 in the vehicle width direction is a suspension support member 28 extending from the rear side frame 5 toward the vehicle lower side (see FIG. 6, see FIG.

According to this configuration, since the suspension support member 28 described above extends from the rear side frame 15 toward the vehicle lower side, the lengths of the intermediate support members 63 and 64 can be made as short as possible.
In addition, the suspension support member 28 can be reinforced by the intermediate support members 63 and 64, and the fuel tank 7 can be protected by the intermediate support members 63 and 64 when a side collision load is input.

  In one embodiment of the present invention, a second reinforcing member 65 whose front end is supported by the fuel tank 7 is provided in parallel with the reinforcing members 61 and 62, and the second reinforcing member 65 is arranged in the vehicle longitudinal direction. A connecting portion (see the connecting member 66) for connecting the portion to one reinforcing member 61 of the pair of left and right reinforcing members 61, 62 is provided (see FIGS. 3 and 4).

  According to this configuration, it is possible to improve the support rigidity of the second reinforcing member 65 by the above-described connecting portion (connecting member 66).

  In one embodiment of the present invention, the rear end of the reinforcing member 61 and the second reinforcing member 65 is connected, and a rear end support member 67 supported by the vehicle body (see the rear cross member 23) is provided. (See FIGS. 3 and 4).

  According to this configuration, it is possible to achieve both improvement in the supporting rigidity of the rear ends of the reinforcing member 61 and the second reinforcing member 65 and the improvement in the mounting strength of the members 61 and 65 with respect to the vehicle body.

  In one embodiment of the present invention, the rear ends of the reinforcing members 61 and 62 are connected to the undercovers 40 and 50 adjacent to the rear ends of the reinforcing members 61 and 62, and the vehicle body (see the rear cross member 23). The rear end support members 67 and 68 are supported by (see FIGS. 9, 10, and 11).

  According to this configuration, the support rigidity of the rear ends of the undercovers 40 and 50 can be improved.

  In one embodiment of the present invention, openings 71, 72, 74 are formed in the rear end support members 67, 68, and reinforcing beads 78, 80 extending in the vertical direction are provided (see FIG. 3).

  According to this configuration, it is possible to maintain the rigidity of the rear end support members 67 and 68 with the reinforcing beads 78 and 80 while reducing the weight of the rear end support members 67 and 68 with the openings 71, 72 and 74. it can.

  In one embodiment of the present invention, an exhaust pipe 32 is provided in the vicinity of the fuel tank 7, and a heat insulator 34 is provided between the fuel tank 7 and the exhaust pipe 32, and the heat insulator 34 is The heat insulator 34 is provided so as to overlap with the undercovers 40 and 50, and the heat insulator 34 is supported on the mounting portions of the undercovers 40 and 50 in the overlap portions OL1 and OL2 (FIGS. 2, 10, and FIG. 11).

  According to this configuration, heat leakage from the overlap portions OL1 and OL2 between the undercovers 40 and 50 and the heat insulator 34 can be suppressed.

In the correspondence between the configuration of the present invention and the above-described embodiment,
The cargo floor of this invention corresponds to the rear part of the rear floor 8 of the embodiment,
Similarly,
The vehicle body member located on the side of the fuel tank vehicle width direction corresponds to the suspension support member 28,
The connecting portion corresponds to the connecting member 66,
The vehicle body that supports the rear end support member corresponds to the rear cross member 23,
The present invention is not limited to the configuration of the above-described embodiment.

  As described above, the present invention is useful for an undercover mounting structure for an automobile in which an undercover is mounted on the lower surface of a vehicle from a kick-up portion in front of a fuel tank to a position immediately before an exhaust silencer disposed below a cargo floor.

7 ... Fuel tank 9 ... Kick-up part 11 ... Exhaust silencer 15 ... Rear side frame 23 ... Rear cross member (vehicle body)
28. Suspension support member (vehicle body member)
32 ... Exhaust pipe 34 ... Heat insulator 40, 50 ... Under cover 61, 62 ... Reinforcement member 63, 64 ... Intermediate support member 65 ... Second reinforcement member 66 ... Connection member (connection part)
67, 68 ... rear end support members 71, 72, 74 ... openings 78, 80 ... reinforcing beads OL1, OL2 ... overlap portions

Claims (7)

An undercover mounting structure for an automobile in which an undercover is mounted on the lower surface of a vehicle over a position immediately before an exhaust silencer disposed below a cargo floor from a kick-up portion in front of a fuel tank,
On the upper surface side of the under cover, a reinforcing member is provided that extends from the front end of the under cover to the rear end of the under cover and is attached to the strength member of the vehicle body at both front and rear positions.
The vehicle longitudinal direction intermediate portion of the reinforcing member comprises a short intermediate support member from the reinforcing member to be attached to the vehicle body member located on the fuel tank vehicle width direction side, the under cover is supported on the reinforcing members <br /> Car undercover mounting structure. 2. The undercover mounting structure for an automobile according to claim 1, wherein the vehicle body member positioned on the lateral side in the fuel tank vehicle width direction is a suspension support member extending from the rear side frame toward the vehicle lower side. In parallel with the reinforcing member, a second reinforcing member whose front end is supported by the fuel tank is provided,
The undercover mounting structure for an automobile according to claim 1 or 2, further comprising a connecting portion for connecting a midway portion in the vehicle longitudinal direction of the second reinforcing member to the reinforcing member. The undercover mounting structure for an automobile according to claim 3, further comprising a rear end support member that is connected to the rear end of the reinforcing member and the second reinforcing member and is supported by a vehicle body. The undercover mounting structure for an automobile according to claim 1 or 2, further comprising a rear end support member that is connected to the rear end of the reinforcing member and an undercover portion adjacent to the rear end of the reinforcing member and supported by the vehicle body. . The undercover mounting structure for an automobile according to claim 4 or 5, wherein an opening is formed in the rear end support member and a reinforcing bead extending in the vertical direction is provided. An exhaust pipe is provided close to the fuel tank,
A heat insulator is provided between the fuel tank and the exhaust pipe,
The heat insulator is provided so as to overlap the under cover,
The undercover mounting structure for an automobile according to any one of claims 1 to 6, wherein a heat insulator is supported by a mounting portion of the undercover in an overlap portion.

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