Vehicle lower structure

Abstract

Provided is a vehicle lower structure capable of suppressing deformation of a lower dash panel toward the inside of the vehicle. The vehicle lower structure includes a floor panel (2) that is disposed between a floor tunnel (1) and a lower side member (3), and a front pillar (4) that extends in the up-down direction of the vehicle from a front end portion (3a) of the lower side member (3). The vehicle lower structure includes a lower dash panel (7) disposed on the front side (2a) of the floor panel (2), and a lower dash panel cross member (8) that extends in the vehicle width direction on the lower end side of the lower dash panel (7). An end portion (14) on the inner side in the vehicle width direction of the lower dash panel cross member (8) is joined to the floor tunnel (1), and an end portion (15) on the outer side in the vehicle width direction is joined to the front pillar (4).

Description

TECHNICAL FIELD

[0001] The present application relates to a vehicle lower structure. BACKGROUND

[0002] In the past, a floor reinforcement of a vehicle is disposed between a floor panel and a cowl cross member in a vehicle up-down direction, and is joined with the floor panel and a front side member rear portion. In addition, the floor reinforcement is disposed on a lower side of the cowl cross member (see, for example, Patent Document 1). Thereby, the floor reinforcement is not divided by the cowl in a vehicle front-rear direction, and a collision load transmitted from the front side member rear portion is transmitted to the floor reinforcement.

[0003] PRIOR ART DOCUMENT

[0004] PATENT DOCUMENT

[0005] Patent Document 1: Japanese Patent No. 6337860 SUMMARY

[0006] PROBLEMS TO BE SOLVED BY THE INVENTION

[0007] However, in the structure in which the cowl cross member is linked with the lower side member, a moment with the lower side of the cowl as a center is generated due to a load input to the lower cowl at the time of a slight overlap collision or an oblique collision. Therefore, there is a problem that deformation of the lower cowl into the interior side occurs, and there is room for further improvement.

[0008] An object of the present application is to provide a vehicle lower structure capable of suppressing deformation of a lower cowl into an interior side.

[0009] MEANS FOR SOLVING THE PROBLEMS

[0010] In order to solve the foregoing problems, a vehicle lower structure of the present application includes a floor tunnel disposed at a vehicle width direction central portion, extending in a vehicle front-rear direction, a lower side member extending in the vehicle front-rear direction on an outer side of the floor tunnel in the vehicle width direction, and a floor panel stretched between the floor tunnel and the lower side member. In addition, the vehicle lower structure includes a front pillar extending in a vehicle up-down direction from a front end portion of the lower side member, a lower cowl disposed on a front side of the floor panel, and a lower cowl cross member extending in the vehicle width direction on a lower end side of the lower cowl. An end portion on an inner side of the lower cowl cross member in the vehicle width direction is linked with the floor tunnel, and an end portion on an outer side in the vehicle width direction is linked with the front pillar.

[0011] EFFECT OF THE INVENTION

[0012] According to the present application, it is possible to provide a vehicle lower structure capable of suppressing deformation of a lower cowl into an interior side. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1is a perspective view of a vicinity of a pillar on a left side in a vehicle cabin, which is a vehicle lower structure of an embodiment of the present application, which is observed by omitting a vehicle body interior member.

[0014] Figure 2 is a sectional view of a position along a line II-II in FIG. 2, which shows a configuration of the vehicle lower structure. Figure 1

[0015] Figure 3 is an end view of a position along a line III-III in FIG. 3, which shows a configuration of the vehicle lower structure. Figure 1

[0016] Figure 4 is a sectional view of a position along a line IV-IV in FIG. 4, which shows a positional relationship of the floor frame and the front side frame in a main part of the configuration of the vehicle lower structure. Figure 1

[0017] is a sectional view of a position along a line V-V in FIG. 5, which shows a configuration of the vehicle lower structure, which shows a joint relationship of the lower dash panel and the floor frame and the front side frame. Figure 5 Figure 4

[0018] Explanation of Reference Numerals

[0019] 1 floor tunnel

[0020] 2 floor panel

[0021] 2a front side

[0022] 3 lower longitudinal beam

[0023] 3a front end portion

[0024] 4 front pillar

[0025] 7 lower dash panel

[0026] 7a front surface

[0027] 8 lower dash panel cross member

[0028] 14 (inner side) end portion

[0029] 15 (outer side) end portion DETAILED DESCRIPTION

[0030] One embodiment of the present application will be explained below with reference to appropriate drawings. The same reference numerals are assigned to the same constituent elements, and repeated explanation is omitted.

[0031] As shown in FIG. 1, a vehicle lower structure 1 of an embodiment of the present application includes a floor tunnel 1a, a floor panel 2, a lower longitudinal beam 3, a front pillar 4, a lower dash panel 7, a lower dash panel cross member 8, and a front side frame 9. Figure 1 ​​​​As shown, the vehicle lower structure of the embodiment includes a floor tunnel 1 disposed at a vehicle width direction central portion and extending in a vehicle front-rear direction, and a lower side member 3 extending in the vehicle front-rear direction at a vehicle width direction outer side of the floor tunnel 1.

[0032] Further, the vehicle lower structure includes a floor panel 2 stretched between the floor tunnel 1 and the lower side member 3, and a front pillar 4 extending in a vehicle up-down direction from a front end portion 3a of the lower side member 3.

[0033] A cross-sectional shape of the floor tunnel 1 in the vehicle width direction is formed in a substantially hat shape.

[0034] Further, the floor panel 2 is formed in a flat plate shape and provided in a pair of left and right. Each floor panel 2 is joined in the vehicle up-down direction with a horizontal flange provided extending from both sides in the vehicle width direction of the floor tunnel 1. Further, a vehicle width direction outer side edge of the floor panel 2 is connected with the lower side member 3.

[0035] The lower side member 3 is disposed at left and right outer side edges in the vehicle width direction. Further, the lower side member 3 is disposed in parallel with the floor tunnel 1 in the front-rear direction. The lower side member 3 has a hollow cross section in a substantially square shape.

[0036] The front pillar 4 has a pillar outer member 5 having a horizontal cross-sectional shape formed in a substantially hat shape, and a pillar inner member 6 formed in a flat plate shape. Further, the pillar outer member 5 is joined with the pillar inner member 6 in the vehicle width direction. Thus, the front pillar 4 is internally formed with a hollow portion 5a having a horizontal cross-sectional shape formed in a substantially trapezoidal shape (see Figure 3 ).

[0037] Further, as shown in Figure 3 , the pillar outer member 5 of the embodiment is disposed such that a front edge 5b is curved inward in the vehicle width direction and overlaps a front surface 7a of a lower front cowl panel 7. Further, the front edge 5b is joined with the front surface 7a in the vehicle front-rear direction.

[0038] As shown in Figure 4 , the vehicle lower structure of the embodiment is provided with a pair of left and right lower front cowl panel cross members 8 extending in the vehicle width direction at a lower end side of the lower front cowl panel 7. Note that, here, the configuration on the left side of the floor tunnel 1 of the vehicle is explained with the floor tunnel 1 of the vehicle as the vehicle width direction center, and the explanation of the right side which is similarly configured is omitted in part.

[0039] Further, an end portion 14 at an inner side in the vehicle width direction of each lower front cowl panel cross member 8 is joined with the floor tunnel 1. Further, an end portion 15 at an outer side in the vehicle width direction of the lower front cowl panel cross member 8 is joined with the front pillar 4.

[0040] Further, in the embodiment, as shown in Figure 2 , the lower front cowl panel cross member 8 is formed in a substantially hat shape indicated by a broken line in the drawing. Further, a closed cross section 19 is formed between the lower front cowl panel cross member 8 and the lower front cowl panel 7 (seeFigure 5 ).

[0041] The lower cowl cross member 8 has a convex portion 8a and front and rear flange portions 8b, 8d. The front and rear flange portions 8b, 8d of the lower cowl cross member 8 extend from the convex portion 8a and are joined to the lower cowl 7.

[0042] Further, as shown in Figure 1 , the floor panel 2 has a floor frame 10 extending in the vehicle front-rear direction between the floor tunnel 1 and the lower longitudinal members 3. The floor frame 10 is provided on the left and right sides of the floor tunnel 1. Left and right flanges extending in the vehicle width direction are provided from both side edges of each floor frame 10 and are joined to the upper surface side of the lower cowl 7 and the floor panel 2.

[0043] The vehicle width direction cross section of the floor frame 10 is formed in a substantially hat shape. Thus, the floor frame 10 extends the interior space in the vehicle front-rear direction between the lower cowl 7 and the upper surface of the floor panel 2.

[0044] Further, as shown in Figure 4 , the front end portion of the floor frame 10 is joined to the upper surface 9 of the lower cowl cross member 8. In the embodiment, the front end portion of the floor frame 10 is joined to the vehicle width direction middle position of the lower cowl cross member 8 and is formed in a substantially T shape in plan view.

[0045] The front end portion of the embodiment is provided with a first joining portion 11 joined to the upper surface portion 8c of the convex portion 8a and a second joining portion 12 joined to the upper surface 8e of the flange portion 8b.

[0046] That is, the front end portion of the floor frame 10 is joined to the upper surface 9 (see Figure 2 ) of the lower cowl cross member 8 formed with a step at two different height positions in the vertical direction.

[0047] In detail, as shown in Figure 2 , the vehicle lower portion structure of the embodiment is provided with a tongue-shaped first joining portion 11 extending from the vehicle width direction middle portion toward the front of the vehicle at the front end portion of the floor frame 10. The first joining portion 11 is provided extending from the upper surface of the floor frame 10.

[0048] Further, on the left and right sides of the first joining portion 11, a pair of second joining portions 12 are provided extending from the left and right flanges from positions lower than the first joining portion 11 in the vehicle vertical direction. The second joining portions 12 overlap and are joined to the upper surface 8e of the rear side flange portion 8d of the convex portion 8a from above.

[0049] Further, as shown in Figure 4As shown, a reinforcing rib portion 13 formed along the longitudinal direction is provided on the upper surface of the floor frame 10 at a position rearward of the flange portion 8d in plan view. The reinforcing rib portion 13 is provided in a groove shape extending toward the rear along the vehicle longitudinal direction on the upper surface of the floor frame 10. The reinforcing rib portion 13 of the embodiment differs in the width direction dimension of the groove according to the position in the vehicle longitudinal direction, and the desired rigidity and shape are set corresponding to the large and small opening holes.

[0050] As shown in Figure 2 , the lower dash panel cross member 8 has a convex portion 8a that forms a closed section 19 with the lower dash panel 7. In addition, end portions on the vehicle width direction outer side of the lower dash panel cross member 8 have convex portions 8s, 8t that branch the convex portion 8a into two. The convex portions 8s, 8t are each formed with a closed section 20, 21. Also, the lower dash panel cross member 8 has front and rear flange portions 8b, 8d that engage with the lower dash panel 7 on the front and rear sides of the convex portion 8a.

[0051] In which, as shown in Figure 4 , the convex portion 8a on the front pillar 4 side is continuously provided with the convex portions 8s, 8t that branch into two, and the closed section 19 inside is in communication with the closed sections 20, 21 in the vehicle width direction.

[0052] The convex portion 8a of the embodiment branches into the convex portions 8s, 8t on the front pillar 4 side. The convex portions 8s, 8t expand in the front-rear direction as they trend toward the front pillar 4 side. A substantially sector-shaped valley portion 8u is formed between the convex portions 8s, 8t.

[0053] The interval W2 between the front end 8f and the rear end 8g of the convex portions 8s, 8t is set to widen as they trend toward the front pillar 4 side, compared to the interval Wl between the front end 8h and the rear end 8j of the convex portion 8a on the floor tunnel 1 side (Wl < W2).

[0054] Also, in the embodiment, the convex portions 8s, 8t expand between them as the valley portion 8u trends from the floor tunnel 1 side toward the front pillar 4 side. Thus, the convex portions 8s, 8t that branch into two are able to expand the interval W2 between the front end 8f and the rear end 8g in a state in which the width dimension in each vehicle longitudinal direction is substantially maintained to be the same size as the continuously provided convex portion 8a.

[0055] In addition, as shown in Figure 5 , the lower dash panel 7 has a wheel house portion 22 (see Figure 1Furthermore, the lower front bulkhead beam 8 extends with its end portion 15 curving upwards toward the vehicle. The protruding portions 8s and 8t of the end portion 15 are disposed on the inner side of the wheel arch portion 22, engaging the front and rear flange portions 8b and 8d and the valley portion 8u with the wheel arch portion 22. Additionally, the lower front bulkhead beam 8 has a connecting portion 16 extending from the flange portion 8b at the front end, through the valley portion 8u, to the flange portion 8d at the rear end. The connecting portion 16 engages with the inner side of the wheel arch portion 22.

[0056] Next, use Figure 3 The following describes the plate assembly around the front pillar 4 in the implementation method. For example... Figure 3 As shown, the outer end 15 of the lower front bulkhead beam 8 in the vehicle width direction joins the inner side of the pillar member 6 in the vehicle width direction via the rear edge 7b of the lower front bulkhead 7. Furthermore, the front edge 5b of the pillar member 5 joins the front surface 7a of the lower front bulkhead 7 in the vehicle longitudinal direction.

[0057] And, as Figure 4 As shown, in this embodiment, the front side frame 23 of the vehicle's lower structure extends towards the front of the lower front bulkhead 7 in the vehicle's longitudinal direction. The floor frame 10 is arranged in a manner that aligns with the front side frame 23 in the vehicle's longitudinal direction.

[0058] In addition, such as Figure 5 As shown, a front upper frame 24 is provided on the outer side of the front frame 23 in the vehicle width direction and above the front frame 23.

[0059] The front end of the front upper frame 24 is connected to the front end of the front frame 23. Furthermore, as... Figure 1 As shown, the front upper frame 24 is connected to a portion of the wheel arch portion 22. The wheel arch portion 22 has a shock absorber mount 22a integrally provided on the inner side of the front upper frame 24 in the vehicle width direction. The upper part of the shock absorber (not shown) is mounted on the shock absorber mount 22a.

[0060] In addition, such as Figure 5 As shown, the rear end of the front upper frame 24 is fastened to the upper part of the outer pillar member 5 of the front pillar 4 via the upper joint 27.

[0061] Additionally, the lower front bulkhead crossbeam 8 is positioned along the upper surface of the lower front bulkhead 7. The lower front bulkhead crossbeam 8 connects the outer end 15 in the vehicle width direction to the middle portion of the front pillar 4 in the vertical direction of the vehicle.

[0062] Additionally, the front frame 23 is joined to the lower front bulkhead 7 via the lower joint 26. Furthermore, in this embodiment, the front upper frame 24 is joined to the front pillar 4 via the upper joint 27.

[0063] Further, the end portion 15 of the lower cowl cross beam 8 is joined between the lower side joint portion 26 and the upper side joint portion 27 in the vehicle up-and-down direction.

[0064] Next, the effect of the vehicle lower structure of the embodiment will be described.

[0065] As shown in Figure 1 , the vehicle lower structure of the embodiment includes a floor tunnel 1 disposed at a vehicle width direction central portion and extending in a vehicle front-and-rear direction, and a lower side frame 3 extending in the vehicle front-and-rear direction at a vehicle width direction outer side of the floor tunnel 1. In addition, the vehicle lower structure includes a floor panel 2 stretched between the floor tunnel 1 and the lower side frame 3, and a front pillar 4 extending in a vehicle up-and-down direction from a front end portion 3a of the lower side frame 3.

[0066] Further, the vehicle lower structure includes a lower cowl 7 disposed at a front side 2a of the floor panel 2, and a lower cowl cross beam 8 extending in the vehicle width direction at a lower end side of the lower cowl 7. Further, an end portion 14 of the lower cowl cross beam 8 at a vehicle width direction inner side is joined to the floor tunnel 1, and an end portion 15 at a vehicle width direction outer side is joined to the front pillar 4.

[0067] Therefore, the vehicle lower structure of the embodiment can suppress deformation of the lower cowl 7 toward the inside of the room.

[0068] In detail, the floor tunnel 1 of the lower cowl 7 is joined to the front pillar 4 by means of the lower cowl cross beam 8. The front pillar 4 extends in the vehicle up-and-down direction. Therefore, the lower cowl cross beam 8 can be joined to the front pillar 4 in the vehicle up-and-down direction, as compared with the case where the lower cowl cross beam 8 is joined to the front end portion 3a of the lower side frame 3.

[0069] Thus, for example, in a vehicle offset collision, an oblique collision, as shown in Figure 5 , a load is input to the front side frame 23 or the front side upper frame 24 at one of the left and right sides. The front pillar 4 transmits the load applied from the joint portion 26 and the joint portion 27 disposed separately in the up-and-down direction to the lower cowl cross beam 8 toward the rear of the vehicle. At this time, the joint portion of the end portion 15 provided at the outer side of the lower cowl cross beam 8 is connected between the joint portion 26 and the joint portion 27.

[0070] Therefore, the load input from the front side frame 23 or the front side upper frame 24 is transmitted to the floor tunnel 1 via the lower cowl cross beam 8. Therefore, a portion of the lower side frame 3 located in front of the lower cowl 7, for example, a lower portion of the lower cowl 7, is not concentrated with the load, and a moment having the lower portion of the lower cowl 7 as an origin is not generated. Thus, deformation of the lower cowl 7 into the inside of the room can be suppressed.

[0071] In addition, as shown in Figure 1As shown, the floor panel 2 is provided with a floor frame 10 extending in the vehicle front-rear direction between the floor tunnel 1 and the lower longitudinal beam 3. The floor frame 10 has a first engagement portion 11 engaged with the upper surface 9 of the lower cowl cross beam 8.

[0072] The first engagement portion 11 of the floor frame 10 is engaged with the upper surface 9 of the lower cowl cross beam 8. Thereby, the first engagement portion 11 presses from above so as not to cause deformation in which the lower cowl cross beam 8 is rolled upward and the lower cowl 7 is tilted toward the interior side.

[0073] Therefore, the collision load transmitted to the lower cowl cross beam 8 is dispersedly transmitted to the floor frame 10. Thus, it is possible to suppress deformation of the lower cowl 7 and the lower cowl cross beam 8 toward the interior side.

[0074] In detail, in the vehicle lower structure of the embodiment, the load transmitted from the front side frame 23 to the lower cowl cross beam 8 is linearly transmitted to the floor frame 10 in the vehicle front-rear direction. In addition, the load is dispersedly transmitted to the front pillar 4 and the floor tunnel 1 via the lower cowl cross beam 8 and the lower cowl 7. Thus, it is possible to suppress deformation of the lower cowl 7 toward the interior side.

[0075] Further, in the embodiment, as shown in Figure 4 , the front end portion of the floor frame 10 is engaged at a vehicle width direction intermediate position of the lower cowl cross beam 8 and formed in a substantially T shape in plan view. Thus, it is possible to balanceably transmit the load from the lower cowl 7 and the lower cowl cross beam 8 to the floor frame 10 and suppress deformation of only one side.

[0076] As shown in Figure 2 , the lower cowl cross beam 8 has a convex portion 8a forming a closed section 19 (see Figure 5 ) with the lower cowl 7. In addition, the lower cowl cross beam 8 has front and rear flange portions 8b, 8d extending from the convex portion 8a and engaged with the lower cowl 7.

[0077] As shown in Figure 4 , the floor frame 10 is provided with the first engagement portion 11 engaged with the upper surface portion 8c of the convex portion 8a and the second engagement portion 12 engaged with the upper surface 8e of the flange portion 8b.

[0078] Thereby, the lower cowl cross beam 8 and the floor frame 10 are engaged at two or more positions by the first engagement portion 11 and the second engagement portion 12. Thus, the load input to the lower cowl cross beam 8 is reliably transmitted to the floor frame 10.

[0079] In addition, the step formed in the height direction between the upper surface portions 8c, 8e can be made to interfere with the front portion of the floor frame 10 formed between the first joint portion 11 and the second joint portion 12. Thus, when the load is input to the lower dash panel beam 8, for example, the deformation of the lower dash panel beam 8 in the direction of rolling up and the direction of retreating is suppressed. Therefore, the deformation of the lower dash panel 7 and the lower dash panel beam 8 toward the inside of the vehicle cabin can be more reliably suppressed.

[0080] The floor frame 10 is provided with a reinforcing rib portion 13 formed along the long dimension direction at a position further rearward than the flange portion 8b in plan view.

[0081] As such, by the floor frame 10 being provided with the reinforcing rib portion 13, the bending rigidity of the floor frame 10 in the long dimension direction is increased, and the bending deformation of the floor frame 10 is reduced. Therefore, the deformation of the lower dash panel beam 8 toward the inside of the vehicle cabin can be suppressed.

[0082] As shown in FIG. 1, the lower dash panel beam 8 includes a convex portion 8a that forms a closed cross section 19 with the lower dash panel 7 and a flange portion 8b that is joined to the lower dash panel 7. Figure 2

[0083] In the embodiment, the interval W2 between the continuously provided front end 8f and the rear end 8g of the convex portion 8a of the lower dash panel beam 8 is enlarged as it approaches the front pillar 4. Thus, the load input to the front pillar 4 due to the offset collision or the oblique collision is efficiently transmitted to the lower dash panel beam 8. Therefore, the local load concentration of the floor tunnel 1 and the floor frame 10 can be avoided, and the deformation of the lower dash panel 7 toward the inside of the vehicle cabin can be suppressed.

[0084] As shown in FIG. 1, the lower dash panel 7 has a wheel house portion 22 (see FIG. 2) fastened to the front pillar 4 on the vehicle width direction outer side. Figure 5 Figure 1 Thus, the continuously provided end portions 15 of the front pillar 4 side of the convex portion 8a are respectively joined to the inner side surface of the wheel house portion 22 through the front and rear flange portions 8b, 8d. In the embodiment, the valley portion 8u formed between the convex portions 8s, 8t is further joined to the inner side surface of the wheel house portion 22.

[0085] Thus, the load input to the front pillar due to the offset collision or the oblique collision is transmitted to the lower dash panel beam 8 by the two or more convex portions 8s, 8t without being concentrated. Therefore, the load is dispersed to the floor tunnel 1 and the floor frame 10 via the lower dash panel beam 8, and the deformation of the lower dash panel 7 can be suppressed.

[0086] Thus, the load input to the front pillar due to the offset collision or the oblique collision is transmitted to the lower dash panel beam 8 by the two or more convex portions 8s, 8t without being concentrated. Therefore, the load is dispersed to the floor tunnel 1 and the floor frame 10 via the lower dash panel beam 8, and the deformation of the lower dash panel 7 can be suppressed. ​​

[0087] Further, the convex portion 8a of the embodiment branches into two convex portions 8s, 8t that engage with the valley portion 8u of the wheel house portion 22.

[0088] Therefore, the valley portion 8u widens between the convex portions 8s, 8t as it approaches the front pillar 4 side from the floor tunnel 1 side. Therefore, the width dimension of each convex portion 8s, 8t can be set to be the same as the convex portion 8a. Further, the valley portion 8u can engage with the inner side surface of the wheel house portion 22. Thus, compared to a case in which the end portion is widened with one convex portion, for example, the rigidity can be increased in correspondence with the increase in the number of convex portions.

[0089] As shown in Figure 3 , the front pillar 4 has a pillar inner member 6 that forms a hollow portion 5a and a pillar outer member 5. Further, the end portion 15 on the vehicle width direction outer side of the lower cowl cross member 8 engages with the pillar inner member 6 by the lower cowl 7. Further, the pillar outer member 5 engages with the front surface 7a of the lower cowl 7.

[0090] In this way, the plate group of the lower cowl cross member 8 and the front pillar 4 of the vehicle lower structure of the embodiment is optimized. For example, the number of panels that engage and the thickness can be homogenized, and the portion in which the input load is concentrated can be reduced.

[0091] Thus, in a side collision, an oblique collision, the load can be efficiently transmitted from the front pillar 4 to the lower cowl cross member 8. Therefore, the load is dispersed to the floor tunnel 1 and the floor frame 10, and the deformation of the lower cowl 7 can be suppressed.

[0092] As shown in Figure 4 , the front side frame 23 extends in the vehicle front-rear direction on the front side of the lower cowl 7, and the floor frame 10 is disposed in a manner arranged in the vehicle front-rear direction with the front side frame 23.

[0093] Therefore, in a side collision, an oblique collision, the floor frame 10 and the front side frame 23 can smoothly transmit and disperse the load that is input in a straight line from the front to the rear. Therefore, the deformation of the lower cowl 7 and the lower cowl cross member 8 is further suppressed.

[0094] As shown in Figure 5 , the front side upper frame 24 is disposed on the vehicle width direction outer side of the front side frame 23. The front side upper frame 24 is fastened to the outer side surface of the pillar outer member 5 of the front pillar 4 (see Figure 1 ) by the engagement portion 27, higher than the front side frame 23 and on the upper side.

[0095] The lower cowl cross member 8 engages the front pillar 4 at an intermediate position in the vehicle up-down direction of at least a portion of the end portion 15 on the vehicle width direction outer side.

[0096] Thus, the end portion 15 of the lower cowl cross member 8 is joined to the front pillar 4 between the joint portion 26 and the joint portion 27 between the front side frame 23 and the lower cowl 7.

[0097] Thus, in a side collision, an oblique collision, a load input from the front side frame 23 is efficiently transmitted to the lower cowl cross member 8. In addition, a load input from the front side upper frame 24 via the front pillar 4 is efficiently transmitted to the lower cowl cross member 8. Thus, deformation of the lower cowl 7 toward the inside of the vehicle cabin can be suppressed.

[0098] In addition, a load in the upward direction applied to the shock absorber seat 22a of the wheel house portion 22 from the shock absorber is transmitted to the lower cowl cross member 8 via the front pillar 4. Thus, deformation of the lower cowl 7 toward the inside of the vehicle cabin can be suppressed.

[0099] The present application is not limited to the above-described embodiments, and various modifications can be made. The above-described embodiments are examples for clearly and easily explaining the present application, and are not limited to having all the configurations described. In addition, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, or the configuration of another embodiment can be added to the configuration of one embodiment. In addition, a part of the configuration of each embodiment can be deleted, or other configurations can be added / replaced. Possible modifications of the above-described embodiments are, for example, as follows.

[0100] The left and right pair of lower cowl cross members 8, 8 of the embodiment each join the inner end portion 14 to the left and right side surfaces of the floor tunnel 1, and join the outer end portion 15 to the inner surface of the wheel house portion 22. However, the present application is not particularly limited thereto.

[0101] For example, the end portions 14, 14 formed on the inner side in the vehicle width direction of each of the left and right lower cowl cross members 8 and joined to the floor tunnel 1 can be integrally joined to each other. In this case, the lower cowl cross member 8 continuously passes through substantially the entire width range in the vehicle cabin, and deformation of the lower cowl 7 can be suppressed.

[0102] That is, at least the end portion 15 on the outer side in the vehicle width direction is joined to the front pillar 4, and the shape, number, and joining method of the joining portion of the lower cowl cross member 8 can be arbitrary.

[0103] In addition, in the embodiment, the front pillar 4 side of the convex portion 8a of the lower cowl cross member 8 is provided with the convex portions 8s, 8t arranged in the wheel house portion 22 and branched into two. However, the present application is not particularly limited thereto. For example, one, a plurality of convex portions branched into three or more can be provided.

[0104] That is, the convex portion can be configured so that the interval between the front end and the rear end of the convex portion widens as it approaches the side of the front pillar 4 and is joined to the front pillar 4, or can not be provided in the wheel cover portion 22. In this way, the shape, the number, and the joining position of the branched convex portions are not particularly limited by the description of the embodiments.

Claims

1. A vehicle substructure comprising: The floor passage is located in the center of the vehicle width direction and extends along the front-to-back direction of the vehicle. The lower longitudinal beam extends along the vehicle's longitudinal direction on the outer side of the floor passage in the vehicle width direction; A base plate, which is installed between the floor channel and the lower longitudinal beam; A front pillar that extends from the front end of the lower longitudinal beam along the vertical direction of the vehicle; The lower front bulkhead is disposed on the front side of the floor plate and has a wheel arch portion that engages with the front pillar on the outer side in the vehicle width direction; as well as The lower front bulkhead crossbeam extends along the vehicle width direction at the lower end of the lower front bulkhead. The vehicle's lower structure is characterized by the following features: The inner end of the lower front bulkhead crossbeam in the vehicle width direction is connected to the floor passage, and the outer end in the vehicle width direction is connected to the front pillar. The lower front bulkhead crossbeam includes a convex portion forming a closed cross section between itself and the lower front bulkhead, and a flange portion extending from the convex portion and engaging with the lower front bulkhead. As the convex portion moves towards the anterior pillar side, the distance between the front end and the rear end of the convex portion widens. The front pillar side of the convex portion is disposed on the wheel cover portion, and the branch is at least two or more.

2. The vehicle substructure according to claim 1, characterized in that, The floor plate has a floor frame that extends in the longitudinal direction of the vehicle between the floor passage and the lower longitudinal beam.

3. The vehicle substructure according to claim 2, characterized in that, The lower front bulkhead crossbeam has a convex portion forming a closed cross section between itself and the lower front bulkhead, and a flange portion extending from the convex portion and engaging with the lower front bulkhead. The floor frame is provided with a first joint that engages with the upper surface of the convex portion and a second joint that engages with the upper surface of the flange portion.

4. The vehicle substructure according to claim 3, characterized in that, The floor frame has reinforcing ribs that are formed along the longitudinal direction at a position located behind the flange when viewed from above.

5. The vehicle substructure according to claim 1, characterized in that, The front pillar has an inner pillar member disposed on the inner side in the vehicle width direction, and an outer pillar member disposed on the outer side in the vehicle width direction, forming a closed cross section with the inner pillar member. The outer end of the lower front bulkhead beam in the vehicle width direction is joined to the internal pillar member via the lower front bulkhead. The front end of the external column member engages with the front surface of the lower front panel.

6. The vehicle substructure according to claim 4, characterized in that, It also features a front side frame that extends in the longitudinal direction and whose rear end engages with the lower front bulkhead. The floor frame is configured to be aligned with the front side frame in the longitudinal direction of the vehicle.

7. The vehicle substructure according to claim 6, characterized in that, It has a front upper frame, which is disposed on the outside and above the front frame in the vehicle width direction and is fastened to the front pillar. In the vertical direction of the vehicle, at least a portion of the outer end of the lower front bulkhead beam in the vehicle width direction engages with the front pillar between the joint where the front side frame engages with the lower front bulkhead and the joint where the front side upper frame engages with the front pillar.

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