Vehicle front structure

Abstract

The vehicle front structure comprises: a power unit, which is mounted on the front of the vehicle; a pair of left and right front side frames, which extend in the front-to-rear direction of the vehicle on both sides of the vehicle width direction relative to the power unit and support the power unit; a pair of left and right front longitudinal beams, which extend in the front-to-rear direction of the vehicle on the upper side of the vehicle of the pair of left and right front side frames, and the rear ends of the pair of left and right front longitudinal beams are respectively connected to the pair of left and right front side frames; a cross beam, which is arranged on the rear side and obliquely upper side of the vehicle of the power unit, and is spanned between the pair of left and right front longitudinal beams in the vehicle width direction, and supports the driver's seat of the vehicle; and a diagonal brace reinforcement, which is spanned in a diagonal brace shape between at least one of the pair of left and right front longitudinal beams and the cross beam.

Description

Technical Field

[0001] The invention relates to a vehicle front structure. Background Art

[0002] Japanese Patent Application Laid-Open No. 2002-308151 discloses a technology related to a cab-type vehicle in which a cab is fixed to a chassis frame.

[0003] In this prior art, a front cross beam is provided at the front end of the cab floor along the vehicle width direction, and a step portion is provided at the middle portion of the cab floor in the vehicle front-rear direction along the vehicle width direction, so that the rear portion of the cab floor is higher than the front portion of the cab floor. A driver's seat is provided at the rear portion of the floor, and an engine is provided below the rear portion of the floor.

[0004] In the above-mentioned prior art, when the front of the vehicle collides (hereinafter referred to as a frontal collision of the vehicle), a load is applied toward the rear side of the vehicle. If the front cross member is deformed, the load is input to the power unit, which may damage the power unit. Summary of the invention

[0005] The present disclosure takes the above-mentioned facts into consideration and provides a vehicle front structure that can reduce the load input to a power unit and suppress damage to the power unit during a frontal collision of the vehicle.

[0006] Means for solving problems

[0007] The vehicle front structure of the first scheme of the present disclosure comprises: a power unit, which is mounted on the front of the vehicle; a pair of left and right front side frames, which extend in the front-to-rear direction of the vehicle on both sides of the vehicle width direction relative to the power unit and support the power unit; a pair of left and right front longitudinal beams, which extend in the front-to-rear direction of the vehicle on the upper side of the vehicle of the pair of left and right front side frames, and the rear end portions of the pair of left and right front longitudinal beams are respectively connected to the pair of left and right front side frames; a cross beam, which is arranged on the rear side and obliquely upper side of the vehicle of the power unit, and is spanned between the left and right front longitudinal beams in the vehicle width direction, and supports the driver's seat of the vehicle; and a diagonal brace reinforcement, which is spanned in a diagonal brace shape between at least one of the pair of left and right front longitudinal beams and the cross beam.

[0008] In the vehicle front structure of the first scheme, a power unit is mounted at the front of the vehicle, and a pair of left and right front side frames extend in the vehicle front-rear direction on both sides of the power unit in the vehicle width direction, respectively, and the power unit is supported by the pair of left and right front side frames.

[0009] A pair of left and right front side beams extend in the vehicle front-rear direction on the vehicle upper side of the pair of left and right front side frames, and rear ends of the pair of left and right front side beams are connected to the pair of left and right front side frames.

[0010] In addition, a cross beam is provided on the rear side and obliquely above the power unit of the vehicle. The cross beam is spanned between a pair of left and right front longitudinal beams in the vehicle width direction. The driver's seat of the vehicle is supported by the cross beam.

[0011] Here, a diagonal brace reinforcement is provided between at least one of the pair of left and right front longitudinal beams and the cross beam in a diagonal brace shape. By providing the diagonal brace reinforcement between the front longitudinal beam and the cross beam, the front longitudinal beam and the cross beam are reinforced.

[0012] Thus, in the present disclosure, when a load toward the front side of the vehicle is input to the driver's seat due to inertia during a frontal collision of the vehicle, deformation of the cross beam supporting the driver's seat can be suppressed. In the present invention, since the cross beam is disposed on the rear side of the vehicle and obliquely above the power unit, by suppressing the deformation of the cross beam, interference between the cross beam and the power unit caused by the deformation of the cross beam can be suppressed.

[0013] In the vehicle front structure of the second scheme, in the vehicle front structure of the first scheme, the power unit is constructed to include: a motor, which is supported on the pair of left and right front side frames and can make the vehicle move; and a drive unit, which is arranged above the vehicle of the motor and controls the drive of the motor.

[0014] In the vehicle front structure of the second scheme, the power unit is configured to include a motor and a drive unit. The motor is supported by a pair of left and right front side frames, and the vehicle can be driven by the motor. On the other hand, the drive unit is arranged above the vehicle of the motor, and the drive unit is used to control the drive of the motor.

[0015] The vehicle front structure of the third scheme is, in the vehicle front structure of the first scheme or the second scheme, the driver's seat is arranged to be offset to one side in the vehicle width direction relative to the center of the vehicle in the vehicle width direction, and the connection portion connected to the cross beam in the diagonal brace reinforcement arranged at least on one side in the vehicle width direction and the driver's seat are overlapped when viewed from the front of the vehicle.

[0016] In the vehicle front structure of the third scheme, the driver's seat is arranged offset to one side in the vehicle width direction relative to the center of the vehicle in the vehicle width direction. In addition, the connecting portion connected to the cross beam in the diagonal brace reinforcement arranged at least on one side in the vehicle width direction and the driver's seat are arranged to overlap when viewed from the front of the vehicle.

[0017] By arranging the driver's seat to be offset to one side in the vehicle width direction relative to the center of the vehicle in the vehicle width direction, deformation of the crossbeam supporting the driver's seat can be suppressed when a load toward the front side of the vehicle is input to the driver's seat due to inertia during a frontal collision of the vehicle, compared to a case where the driver's seat is arranged in the center of the vehicle in the vehicle width direction.

[0018] In addition, in the present invention, the connecting portion of the diagonal brace reinforcement member connected to the cross beam and the driver's seat are arranged to overlap when viewed from the front of the vehicle. Therefore, when the front collision of the vehicle occurs, if a load toward the rear side of the vehicle is applied to the front longitudinal beam, the load toward the rear side of the vehicle will act on the driver's seat side via the connecting portion. Thus, in the present invention, a part of the load toward the front side of the vehicle that acts on the driver's seat due to inertia when the vehicle hits the front can be offset. As a result, the load toward the front side of the vehicle that acts on the driver's seat can be reduced.

[0019] The vehicle front structure of the fourth scheme is, in the vehicle front structure of the first scheme or the second scheme, a pair of left and right diagonal brace reinforcements are respectively provided in a diagonal brace shape between each of the pair of left and right front longitudinal beams and the cross beam, and each connection portion of the pair of left and right diagonal brace reinforcements connected to the cross beam and the driver's seat are overlapped when viewed from the front of the vehicle.

[0020] In the vehicle front structure of the fourth scheme, a pair of left and right diagonal brace reinforcements are respectively provided between the left and right front longitudinal beams and the cross beam in a diagonal brace shape. Therefore, compared with the case where the diagonal brace reinforcement is provided between only one of the front longitudinal beams and the cross beam, the front longitudinal beam and the cross beam can be further strengthened. Thus, even if a load toward the front side of the vehicle is input to the driver's seat due to inertia during a frontal collision of the vehicle, deformation of the cross beam can be further suppressed.

[0021] Here, in the present disclosure, the connection portion connected to the cross beam in the pair of left and right diagonal bracing reinforcements and the driver's seat are arranged to overlap when viewed from the front of the vehicle. Therefore, when the vehicle collides from the front, if a load toward the rear side of the vehicle is applied to the front longitudinal beam, the load toward the rear side of the vehicle will act on the driver's seat through the connection portion.

[0022] Therefore, in the present disclosure, the load acting on the driver's seat toward the rear side of the vehicle is increased compared to the case where the connection portion connected to the cross beam in only one diagonal brace reinforcement overlaps with the driver's seat when viewed from the front of the vehicle. As a result, a part of the load acting on the driver's seat toward the front side of the vehicle during a frontal collision of the vehicle can be further effectively offset, and the load acting on the driver's seat toward the front side of the vehicle due to inertia can be further reduced.

[0023] A vehicle front structure according to a fifth aspect is the vehicle front structure according to any one of the first to fourth aspects, wherein the diagonal reinforcement is arranged to overlap with the power unit in a vehicle front-rear direction when viewed from the side of the vehicle.

[0024] In the vehicle front structure of the fifth aspect, since the diagonal reinforcement is arranged to overlap with the power unit in the vehicle front-rear direction when viewed from the side of the vehicle, the power unit can be protected from impact from the side of the vehicle.

[0025] Effects of the Invention

[0026] As described above, according to the vehicle front structure of the first aspect, it is possible to reduce the load input to the power unit at the time of a frontal collision of the vehicle and suppress damage to the power unit.

[0027] According to the vehicle front structure of the second aspect, it is possible to reduce at least the load input to the drive unit during a frontal collision of the vehicle and suppress damage to the drive unit.

[0028] According to the vehicle front structure of the third aspect, the load acting on the driver's seat toward the front side of the vehicle during a frontal collision of the vehicle can be reduced, thereby reducing the load input to the power unit.

[0029] According to the vehicle front structure of the fourth aspect, the load acting on the driver's seat toward the front side of the vehicle during a frontal collision of the vehicle can be further reduced, thereby further reducing the load input to the power unit.

[0030] According to the vehicle front structure of the fifth aspect, the load input to the power unit can be further reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Features, advantages, and technical and industrial significance of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings, in which like reference numerals represent like elements, and in which:

[0032] Figure 1 It is a plan view showing the front portion of a vehicle to which the vehicle front portion structure according to the present embodiment is applied.

[0033] Figure 2 It is along Figure 1 The cross-sectional view is shown along line AA.

[0034] Figure 3 FIG. 1 is a diagram showing a modified example of the front portion of a vehicle to which the vehicle front portion structure of the present embodiment is applied. Figure 2 The corresponding cross-sectional view. DETAILED DESCRIPTION

[0035] Hereinafter, a vehicle front structure 10 according to an embodiment of the present disclosure will be described with reference to the accompanying drawings. In addition, in each figure, a part of the figure marks may be omitted for ease of viewing the drawings. In addition, the arrows FR, LH, and UP appropriately recorded in each figure respectively indicate the front of the vehicle (direction of travel), the left of the vehicle, and the top of the vehicle. Hereinafter, when only the front and rear, left and right, and up and down directions are used for description, unless otherwise specified, the front and rear of the vehicle front and rear direction, the left and right of the vehicle left and right direction (vehicle width direction), and the up and down of the vehicle up and down direction are indicated.

[0036] (Structure of the front structure of the vehicle)

[0037] First, the structure of the vehicle front structure 10 according to the present embodiment will be described.

[0038] like Figure 1 , Figure 2 As shown, a vehicle 12 to which the vehicle front structure 10 of the present embodiment is applied is a vehicle having a frame structure in which a body 16 having a cab is fixed to the upper side of a ladder frame 14, and is, for example, a shared vehicle such as a bus. Although not shown in the figure, the body 16 of the vehicle 12 has a substantially rectangular parallelepiped shape. For example, the vehicle 12 is an electric car. First, the skeleton structure of the vehicle 12 will be described in general.

[0039] The above-mentioned ladder frame 14 includes left and right (a pair of) side frames 18 and a plurality of cross beams 20, 22. The left and right side frames 18 extend in the front-rear direction at both sides of the vehicle 12 in the vehicle width direction. The plurality of cross beams 20, 22 are arranged at intervals in the front-rear direction and extend in the vehicle width direction. In addition, the left and right side frames 18 are connected in the vehicle width direction by the plurality of cross beams 20, 22.

[0040] The left and right side frames 18 are composed of left and right front side frames 24, left and right center side frames 26, and left and right rear side frames (not shown). The left and right front side frames 24 extend in the front-to-back direction at both sides of the front portion of the vehicle 12 in the vehicle width direction. The left and right center side frames 26 extend in the front-to-back direction at both sides of the front portion of the vehicle 12 in the vehicle width direction. The left and right rear side frames extend in the front-to-back direction at both sides of the rear portion of the vehicle 12 in the vehicle width direction.

[0041] In addition, the front side frame 24, the central side frame 26 and the rear side frame are formed into a square tube shape by steel, for example, and have a rectangular closed cross section when viewed from the front and rear directions. In addition, a plurality of cross beams not shown are also provided between the left and right central side frames 26 and between the left and right rear side frames.

[0042] Front portions 24F of the left and right front side frames 24 extend linearly in the front-rear direction, and the front-rear middle portions of the front portions 24F are connected in the vehicle width direction by the cross member 22. Although not shown, suspension towers are fixed to the outer side surfaces of the front portions 24F in the vehicle width direction.

[0043] The front side portion of the rear portion 24R of the left and right front side frames 24 is formed into a kick portion 25 that is inclined downwardly toward the rear side, and the rear side portion extends linearly in the front-to-rear direction. Each kick portion 25 is formed to be bent in a substantially crank shape when viewed from the side of the vehicle, and each kick portion 25 is provided with curved portions 25F and 25R at the front and rear of the vehicle. The curved portion 25F provided at the front side is convexly curved toward the upper side and the rear side, and the curved portion 25R provided at the rear side is convexly curved toward the lower side and the front side. The front portion of each kick portion 25 is connected in the vehicle width direction by a cross beam 22. In addition, the front end portion of the left and right central side frames 26 is connected to the rear end portion of each kick portion 25.

[0044] A motor 32 for driving the vehicle 12 is disposed between the left and right front side frames 24. The motor 32 is supported by the left and right front side frames 24 via the cross beams 20, 22, a support member (not shown), and the like. In addition, a control unit (drive unit) 34 for controlling the power supplied to the motor 32 is disposed above the motor 32. The control unit 34 is supported by the left and right front side frames 24 via a pair of support frames 35 that are installed between the left and right front side frames 24 and are arranged at the front and rear of the vehicle, and the motor 32 and the control unit 34 constitute a power unit 30.

[0045] The vehicle body 16 supported from below by the ladder frame 14 of the above structure has a floor panel 38 constituting a floor portion of the vehicle interior 36. The floor panel 38 includes a front floor panel 40 constituting a floor portion of the front portion of the vehicle interior 36, a center floor panel 42 constituting a floor portion of the middle portion in the front-rear direction of the vehicle interior 36, and a rear floor panel (not shown) constituting a floor portion of the rear portion of the vehicle interior 36. The front floor panel 40, the center floor panel 42, and the rear floor panel are formed of, for example, steel plates.

[0046] The front portion of the front floor panel 40 is formed as a driver's seat floor portion 40F extending in the front-rear direction and the vehicle width direction. The rear portion of the front floor panel 40 is formed as an inclined portion 40R inclined at a downward slope toward the vehicle rear side.

[0047] The driver's seat floor portion 40F is disposed upwardly away from the front portion 24F of the left and right front side frames 24, and the inclined portion 40R is disposed upwardly away from the rear portion 24R of the left and right front side frames 24. In addition, the control unit 34 described above is disposed below the driver's seat floor portion 40F.

[0048] The front end of the center floor panel 42 is connected to the rear end of the inclined portion 40R. The center floor panel 42 extends in the front-rear direction and the vehicle width direction. A battery (not shown) for storing power for supplying to the aforementioned motor 32 is arranged below the center floor panel 42. A step difference is provided between the driver's seat floor portion 40F and the ordinary floor portion (other floor portion) 42A formed by the center floor panel 42, and the driver's seat floor portion 40F is located at a position higher than the ordinary floor portion 42A.

[0049] The front floor panel 40 is supported by the left and right front side frames 24 via a pair of left and right front longitudinal beams 48. The left and right front longitudinal beams 48 extend in the front-rear direction at the upper side and the outer side in the vehicle width direction relative to the left and right front side frames 24. The left and right front longitudinal beams 48 are manufactured by, for example, stamping a steel plate, and are joined to the lower surface of the front floor panel 40 by welding or the like, so as to form a closed cross section extending in the vehicle front-rear direction between the front floor panel 40 and the front floor panel 40.

[0050] The front portions 48F of the left and right front longitudinal beams 48 extend linearly in the front-to-rear direction and are joined to the lower surface of the driver's seat floor portion 40F of the front floor panel 40. The rear portions 48R of the left and right front longitudinal beams 48 are respectively provided with recoil portions 49 that are inclined at a downward slope toward the rear side and are respectively joined to the lower surface of the inclined portion 40R of the front floor panel 40. Each recoil portion 49 is formed to be bent in a substantially crank shape when viewed from the side of the vehicle, and each recoil portion 49 is provided with curved portions 49F and 49R at the front and rear of the vehicle. The curved portion 49F provided at the front side is curved convexly toward the upper side and the rear side, and the curved portion 49R provided at the rear side is curved convexly toward the lower side and the front side.

[0051] In addition, a front cross member 50 extending in the vehicle width direction is arranged at the front end portions of the left and right front longitudinal beams 48. The front cross member 50 is made of, for example, a steel plate and has a hat-shaped cross section that is open to the front side when viewed from the vehicle width direction. At the front end portions of the left and right front longitudinal beams 48, for example, a flange portion that overlaps with the rear surface of the front cross member 50 is provided, and the flange portion is fixed to the rear surface of the front cross member 50 by bolt fastening or the like. Thus, the front end portions of the left and right front longitudinal beams 48 are connected in the vehicle width direction by the front cross member 50.

[0052] The two ends of the front cross beam 50 in the vehicle width direction are supported by the front ends of the left and right front side frames 24 via the front side pillar members 52 provided on the left and right. The left and right front side pillar members 52 are formed by, for example, stamping a steel plate and are in a box shape with the front side and the upper side open. Each front side pillar member 52 is fixed to the front cross beam 50 by, for example, welding, bolting, etc., by a flange portion (not shown) formed at the upper end thereof. The lower ends of each front side pillar member 52 are fixed to the front side frames 24 via brackets (not shown).

[0053] The front end of each recoil portion 49 in the left and right front longitudinal beams 48 is supported by the left and right front side frames 24 via the rear side pillar members 56 provided on the left and right. The left and right rear side pillar members 56 are formed by, for example, stamping a steel plate and are in a box shape with the center side and the upper side open in the vehicle width direction. Each rear side pillar member 56 has a flange portion formed at its upper end fixed to the front end of each recoil portion 49 by, for example, welding. The lower end of each rear side pillar member 56 is fixed to the front side frame 24 via a bracket not shown in the figure.

[0054] The left and right front longitudinal beams 48 are supported from below by the left and right front side frames 24 via the front cross beam 50, the front side pillar member 52, the rear side pillar member 56, etc. The front floor panel 40 is supported from below by the left and right front longitudinal beams 48. An instrument panel 60 is placed and fixed on the upper surface of the front portion of the front floor panel 40.

[0055] The front end portions of the respective recoil portions 49 in the left and right front longitudinal beams 48 are connected in the vehicle width direction by a seat cross beam (cross beam) 62. The seat cross beam 62 is formed into a square tube shape, for example, from steel, and extends in the vehicle width direction. Both ends of the seat cross beam 62 in the vehicle width direction are connected to the front end portions of the respective recoil portions 49 by welding or the like. The rear end portion of the driver's seat floor portion 40F is connected to the upper surface of the seat cross beam 62 by welding or the like, and the seat cross beam 62 supports the front end portion of the seat frame 64 from the lower side.

[0056] The seat frame 64 is a frame that supports the driver's seat 66 provided on the right side of the vehicle 12 from the lower side. The seat frame 64 includes a pair of left and right vertical portions 64V extending in the up-down direction and a horizontal portion 64H extending rearward from the upper ends of the left and right vertical portions 64V. A diagonal brace portion 64B is provided between the lower end of the vertical portion 64V and the middle portion in the front-rear direction of the horizontal portion 64H in a diagonal brace shape.

[0057] A fixing portion 70 is provided at the lower end of the vertical portion 64V. The lower end of the vertical portion 64V is fixed to the rear end of the driver's seat floor portion 40F and the seat cross beam 62 by bolt fastening or other methods via the fixing portion 70. On the other hand, the rear end of the horizontal portion 64H is fixed to the middle portion in the vertical direction of a pair of left and right pillars 68 erected from the front end of the center floor panel 47. The left and right pillars 68 are formed into a square cylinder shape, for example, from steel, and extend in the vertical direction and are arranged at intervals in the vehicle width direction. A longitudinal wall portion 69 is provided between the left and right pillars 68 along the vehicle width direction, and a plurality of passenger seats are provided on the rear side of the longitudinal wall portion 69, although not shown in the figure.

[0058] As described above, the rear portions 24R and 48R of the left and right front side frames 24 and the left and right front longitudinal beams 48 disposed above and below are provided with the recoil portions 25 and 49 inclined downwardly toward the rear side. The recoil portions 25 and 49 are located on the rear side of the pair of left and right vertical portions 64V constituting the front end portion of the seat frame 64.

[0059] Here, in the present embodiment, diagonal brace reinforcements 72 and 74 having substantially the same length are respectively provided on the inner side of the left and right front longitudinal beams 48 in the vehicle width direction, between the left and right front longitudinal beams 48 and the seat cross beam 62, in a diagonal brace shape (the angle formed with the seat cross beam 62 is approximately 45 degrees). As described above, the driver's seat 66 is disposed on the right side of the vehicle 12, and the connecting portion 72A between the diagonal brace reinforcement 72 and the seat cross beam 62 is arranged to overlap with the driver's seat 66 when viewed from the front of the vehicle. The connecting portion 72B between the diagonal brace reinforcement 72 and the front longitudinal beam 48 is arranged to overlap with the power unit 30 in the vehicle front-rear direction when viewed from the side of the vehicle. Therefore, the diagonal brace reinforcement 72 and the power unit 30 are arranged to overlap when viewed from the side of the vehicle. The connecting portion 74A between the diagonal brace reinforcement 74 and the seat cross beam 62 is arranged to the left of the center in the vehicle width direction. The connecting portion 74B between the diagonal brace reinforcement 74 and the front side member 48 overlaps with the power unit 30 in the vehicle front-rear direction when viewed from the side of the vehicle. Therefore, the diagonal brace reinforcement 74 and the power unit 30 overlap when viewed from the side of the vehicle.

[0060] (Functions and effects of the vehicle's front structure)

[0061] Next, the operation and effects of the vehicle front structure 10 according to the present embodiment will be described.

[0062] like Figure 1 , Figure 2As shown, in the vehicle front structure 10 of the present embodiment, a power unit 30 is mounted on the vehicle front 11 , and on both sides of the vehicle width direction relative to the power unit 30 , left and right front side frames 24 extend respectively in the vehicle front-rear direction, and the power unit 30 is supported by the left and right front side frames 24 .

[0063] Furthermore, on the vehicle upper side of the left and right front side frames 24, a pair of left and right front longitudinal beams 48 extend in the vehicle front-rear direction, respectively, and rear ends (recoil portions 49) of the pair of left and right front longitudinal beams 48 are respectively connected to the pair of left and right front side frames 24. In addition, a seat cross beam 62 is provided on the vehicle rear side and obliquely above the power unit 30, and the seat cross beam 62 is spanned between the pair of left and right front longitudinal beams 48 in the vehicle width direction. Furthermore, a driver's seat 66 of the vehicle 12 is supported by the seat cross beam 62.

[0064] In addition, in the present embodiment, the left and right front side frames 24 and the rear portions 24R and 48R of the left and right front longitudinal beams 48 are provided with the recoil portions 25 and 49 that are inclined with a downward slope toward the rear side, respectively. Therefore, when the vehicle 12 is hit from the front, stress is concentrated on the bent portions 25F, 25R, 49F, and 49R of the recoil portions 25 and 49, and the recoil portions 25 and 49 are deformed starting from the bent portions 25F, 25R, 49F, and 49R. The collision load can be absorbed by this deformation.

[0065] In the present embodiment, as described above, the rear ends (recoil portions 49 ) of the pair of left and right front side members 48 are respectively connected to the pair of left and right front side frames 24 , so that deformation at the respective recoil portions 25 , 49 can be stabilized.

[0066] Here, in the present embodiment, diagonal brace reinforcements 72 and 74 are respectively provided between the left and right front longitudinal beams 48 and the seat cross beam 62 in a diagonal brace shape. Thus, in the present embodiment, the front longitudinal beam 48 and the seat cross beam 62 are reinforced. Therefore, in the present embodiment, when a load toward the front side of the vehicle is input to the driver's seat 66 due to inertia during a frontal collision of the vehicle 12, deformation of the seat cross beam 62 supporting the driver's seat 66 can be suppressed.

[0067] In the present embodiment, the seat cross beam 62 is provided on the vehicle rear side and obliquely above the power unit 30. Therefore, by suppressing the deformation of the seat cross beam 62, interference between the seat cross beam 62 and the power unit 30 caused by the deformation of the seat cross beam 62 can be suppressed. As a result, in the present embodiment, damage to the power unit 30 can be suppressed.

[0068] In the present embodiment, the power unit 30 is configured to include a motor 32 capable of driving the vehicle 12 and a control unit 34 for controlling the driving of the motor 32, and the control unit 34 is disposed above the motor 32. In the present embodiment, since the deformation of the seat cross beam 62 disposed on the vehicle rear side of the power unit 30 is suppressed at the time of a frontal collision of the vehicle 12, it is possible to at least reduce the load input to the control unit 34 due to the deformation of the seat cross beam 62 at the time of a frontal collision of the vehicle 12, thereby suppressing damage to the control unit 34.

[0069] In addition, in the present embodiment, the driver's seat 66 is provided on the right side of the vehicle 12. That is, the driver's seat 66 is arranged to be offset to one side in the vehicle width direction relative to the center in the vehicle width direction of the vehicle 12. Therefore, in the present embodiment, as a comparative example, although not shown in the figure, when a load toward the front side of the vehicle is input to the driver's seat 66 due to inertia during a frontal collision of the vehicle 12, the deformation of the seat cross member 62 supporting the driver's seat 66 can be suppressed.

[0070] Furthermore, in the present embodiment, when a frontal collision of the vehicle 12 occurs, if a load toward the vehicle rear side is applied to the front longitudinal beam 48, a portion of the collision load input to the front longitudinal beam 48 is transmitted to the seat cross beam 62 via the diagonal reinforcement 72, and then dispersed in the vehicle width direction along the seat cross beam 62. In other words, a portion of the collision load input in the vehicle front-rear direction can be converted into a load transmitted in the vehicle width direction.

[0071] Here, in the present embodiment, the connecting portion 72A of the diagonal reinforcement 72 connected to the seat cross member 62 and the driver's seat 66 are arranged to overlap when viewed from the front of the vehicle. Therefore, in the present embodiment, when a load toward the rear side of the vehicle is applied to the front longitudinal member 48 during a frontal collision of the vehicle 12, the load toward the rear side of the vehicle is applied to the driver's seat 66 side via the connecting portion 72A. Therefore, in the present embodiment, a part of the load toward the front side of the vehicle acting on the driver's seat 66 due to inertia during a frontal collision of the vehicle 12 can be offset. As a result, the load toward the front side of the vehicle acting on the driver's seat 66 can be reduced.

[0072] As described above, in the present embodiment, the diagonal reinforcement members 72 and 74 are respectively provided between the left and right front longitudinal beams 48 and the seat cross beam 62. Thus, the left and right front longitudinal beams 48 and the seat cross beam 62 are reinforced to suppress the deformation of the seat cross beam 62 supporting the driver's seat 66, but the present invention is not limited to this as long as the deformation of the seat cross beam 62 can be suppressed.

[0073] For example, in the present embodiment, the driver's seat 66 is provided on the right side of the vehicle 12. Therefore, it is sufficient to provide at least the diagonal brace reinforcement 72 on the right side of the vehicle 12, and although the rigidity is lower than when the left and right front longitudinal beams 48 and the seat cross beam 62 are reinforced, it is not necessarily necessary to provide the diagonal brace reinforcements 72 and 74.

[0074] In addition, in the present embodiment, the diagonal brace reinforcements 72 and 74 are set to have substantially the same length. However, depending on the position of the driver's seat 66 , the diagonal brace reinforcements 72 and 74 do not necessarily need to have the same length.

[0075] (Variation of this embodiment)

[0076] In the above embodiment, if Figure 2 As shown, the driver's seat 66 is disposed on the right side of the vehicle 12, but may also be disposed on the right side of the vehicle 12. Figure 3 As shown, the driver's seat 66 is provided in the center portion in the width direction of the vehicle 12. In this case, left and right brace reinforcements 76 and 78 are provided between the left and right front longitudinal members 48 and the seat cross member 62 in a brace-like manner.

[0077] Here, since the connecting portions 76A and 78A of the left and right diagonal brace reinforcements 76 and 78 and the driver's seat 66 are arranged to overlap when viewed from the front of the vehicle, the diagonal brace reinforcements 76 and 78 are formed to be larger than the diagonal brace reinforcements 72 and 74 (see Figure 2 )long.

[0078] Thus, in the present embodiment, the driver's seat 66 is provided in the center portion in the width direction of the vehicle 12, and the connecting portions 76A, 78A of the left and right diagonal reinforcements 76, 78 and the driver's seat 66 are respectively set to overlap each other when viewed from the front of the vehicle.

[0079] Thus, as a comparative example, although not shown, by reinforcing the center portion of the seat cross beam 62 in the longitudinal direction, deformation of the seat cross beam 62 can be further suppressed, compared with a case where the diagonal reinforcement members 76 and 78 are provided on both end sides of the seat cross beam 62 in the vehicle width direction. As a result, even if a load toward the vehicle front side is input to the driver's seat 66 due to inertia during a frontal collision of the vehicle 12, deformation of the seat cross beam 62 can be further suppressed.

[0080] Here, in this embodiment, the connecting parts 76A, 78A of the left and right diagonal reinforcements 76, 78 and the driver's seat 66 are arranged to overlap when viewed from the front of the vehicle. Therefore, in this embodiment, a load toward the vehicle rear side acts on the driver's seat 66 via the connecting parts 76A, 78A.

[0081] Therefore, as a comparative example, although not shown in the figure, the load acting on the driver's seat toward the vehicle rear side increases compared to the case where only the connecting portion 76A of the diagonal brace reinforcement 76 connected to the seat cross member 62 and the driver's seat 66 are arranged to overlap when viewed from the front of the vehicle. As a result, a part of the load acting on the driver's seat 66 toward the vehicle front side due to inertia during a frontal collision of the vehicle 12 can be further effectively offset, and the load acting on the driver's seat 66 toward the vehicle front side due to inertia can be further reduced.

[0082] The present invention can be implemented with various modifications without departing from the gist of the invention. The scope of rights of the present invention is of course not limited to the above-described embodiments.

Claims

1. A vehicle front structure, comprising: A power unit, wherein the power unit is mounted on the front of the vehicle; A pair of left and right front side frames, the pair of left and right front side frames extending in the vehicle front-to-back direction on both sides of the vehicle width direction relative to the power unit and supporting the power unit, the front side portion of each rear portion of the pair of left and right front side frames forming a recoil portion inclined at a downward slope toward the rear side, the rear side portion extending linearly in the front-to-back direction, the recoil portion being formed to be bent in a crank shape when viewed from the side of the vehicle; A pair of left and right front longitudinal beams, the pair of left and right front longitudinal beams extending in the front-to-rear direction of the vehicle on the upper side of the pair of left and right front side frames, the rear end portions of the pair of left and right front longitudinal beams are respectively connected to the pair of left and right front side frames, the front portions of the pair of left and right front longitudinal beams each extend straight in the front-to-rear direction, and the rear portions are provided with a recoil portion inclined at a downward slope toward the rear side, the recoil portion being formed to be bent in a crank shape when viewed from the side of the vehicle; a cross member disposed on the vehicle rear side and obliquely above the power unit, spanning between the pair of left and right front longitudinal members in the vehicle width direction, and supporting a driver's seat of the vehicle; and A diagonal brace reinforcement is provided in a diagonal brace shape and is spanned between at least one of the pair of left and right front side members and the cross member.

2. The vehicle front structure according to claim 1, The power unit is composed of: a motor supported by the pair of left and right front side frames and capable of driving the vehicle; as well as A drive unit is disposed above the vehicle of the motor and controls the driving of the motor.

3. The vehicle front structure according to claim 1 or 2, The driver's seat is arranged to be offset to one side in the vehicle width direction relative to the center of the vehicle in the vehicle width direction, and the connection portion connected to the cross beam in the diagonal support reinforcement arranged at least on one side in the vehicle width direction and the driver's seat are overlapped when viewed from the front of the vehicle.

4. The vehicle front structure according to claim 1 or 2, A pair of left and right diagonal brace reinforcements are respectively arranged between the pair of left and right front longitudinal beams and the cross beam in a diagonal brace shape. Each connection portion of the pair of left and right diagonal reinforcements connected to the cross member and the driver's seat are arranged to overlap when viewed from the front of the vehicle.

5. The vehicle front structure according to claim 1 or 2, The diagonal brace reinforcement is arranged to overlap with the power unit in the vehicle front-rear direction when viewed from the side of the vehicle.

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