Vehicle front structure

Abstract

The present invention provides a vehicle front structure, comprising: a power unit, which is arranged at the front of the vehicle; left and right front side frames, which extend along the front-rear direction of the vehicle at both sides of the vehicle width direction opposite to the power unit, constitute the front part of the ladder frame of the vehicle, support the power unit, and have a lower bent portion inclined downwardly toward the rear side of the vehicle formed at the rear part of each of the left and right front side frames; and left and right front longitudinal beams, which extend along the front-rear direction of the vehicle at the upper side of the vehicle of the left and right front side frames, are supported by the left and right front side frames, constitute a part of the vehicle body, and have an upper bent portion inclined downwardly toward the rear side of the vehicle formed at the rear part of each of the left and right front longitudinal beams.

Description

Technical Field

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

[0002] In the cab-over truck described in Japanese Patent Application Publication No. 2007-168556, an engine disposed below a cab is supported by the front portion of a chassis frame. A floor member constituting a part of the frame of the cab is disposed above the front portion of the chassis frame. The floor member extends in the front-rear direction of the vehicle, and the front end and the rear end are supported by the chassis frame.

[0003] In the above-mentioned prior art, an engine is mounted on the front part of the chassis frame. However, when a power unit including an electric motor is mounted instead of the engine, an electronic unit for controlling the power supplied to the electric motor is sometimes mounted above the electric motor. In such a vehicle, it is considered that when the front part of the chassis frame deforms upward during a head-on collision, for example, the electronic unit supported by the front part of the chassis frame may collide with the cab and be damaged. Since high-voltage power is supplied to the electronic unit, it is necessary to take measures to prevent the above-mentioned damage. Summary of the invention

[0004] The present disclosure takes the above-mentioned facts into consideration and achieves a vehicle front structure capable of preventing a power unit from colliding with a vehicle body at the time of a frontal collision.

[0005] The vehicle front structure of the first scheme of the present disclosure comprises: a power unit, which is arranged at the front of the vehicle; left and right front side frames, which extend in the front-rear direction of the vehicle at both sides in the vehicle width direction corresponding to the power unit, constitute the front part of the frame of the vehicle, support the power unit, and have a lower bent portion inclined downhill toward the rear side of the vehicle formed at the rear part of each of the left and right front side frames; and left and right front longitudinal beams, which extend in the front-rear direction of the vehicle at the upper side of the vehicle of the left and right front side frames, are supported on the left and right front side frames, constitute a part of the vehicle body, and have an upper bent portion inclined downhill toward the rear side of the vehicle formed at the rear part of each of the left and right front longitudinal beams.

[0006] In the first scheme, when the vehicle collides head-on, the left and right front side frames and the left and right front longitudinal beams are deformed at the lower bend and the upper bend. The collision load can be absorbed by this deformation. Moreover, by the above-mentioned deformation, the left and right front side frames and the left and right front longitudinal beams are displaced toward the upper and oblique rear side of the vehicle in a state of being parallel or substantially parallel to each other. At this time, the power unit disposed between the left and right front side frames and supported by the left and right front side frames and the vehicle body, a part of which is constituted by the left and right front longitudinal beams, are displaced toward the upper and oblique rear side of the vehicle together. Thereby, the power unit can be prevented from colliding with the vehicle body.

[0007] A vehicle front structure according to a second aspect of the present disclosure is a structure according to the first aspect, wherein the vehicle body includes a floor member that is disposed above the power unit in the vehicle and supported by the left and right front side members to constitute a floor portion of a vehicle compartment.

[0008] In the second embodiment, when the vehicle is hit head-on, the left and right front side frames and the left and right front longitudinal beams are deformed at the upper and lower bent portions. As a result, the power unit supported by the left and right front side frames and the floor member disposed above the power unit and supported by the left and right front longitudinal beams are displaced toward the upper and oblique rear side of the vehicle. As a result, the power unit can be prevented from colliding with the floor member.

[0009] A vehicle front structure according to a third aspect of the present disclosure is the first aspect or the second aspect, and includes a cross member connecting front end portions of the upper bent portions in a vehicle width direction.

[0010] In the third aspect, the front ends of the upper bent portions of the left and right front side members are connected in the vehicle width direction by the cross member. This can stabilize the deformation of the upper bent portions of the left and right front side members, for example.

[0011] A vehicle front structure according to a fourth aspect of the present disclosure is a structure according to the third aspect, and includes a seat frame having a front end portion supported by the cross member and supporting a seat of the vehicle.

[0012] In the fourth embodiment, the front end of the seat frame supporting the seat of the vehicle is supported by the cross beam. When the vehicle is hit head-on, the left and right front longitudinal beams are deformed at the upper bending portion, and the cross beam, the left and right front longitudinal beams and the seat frame are displaced to the upper and oblique side of the rear of the vehicle, that is, to the side opposite to the collision object with the vehicle. As a result, the seat supported by the seat frame can be moved back to the side opposite to the collision object.

[0013] The vehicle front structure of the fifth scheme of the present disclosure is based on any one of the first to fourth schemes, and is provided with a deformation portion at the front of the left and right front side frames that is compressed and deformed in the front-to-rear direction of the vehicle when the vehicle is in a head-on collision. The front portions of the left and right front longitudinal beams and each of the deformation portions are connected by left and right connecting parts, and the left and right connecting parts are constructed to be more easily plastically deformed than the left and right front longitudinal beams with respect to the collision load of a head-on collision.

[0014] In the fifth scheme, a deformation portion that is compressed and deformed in the front-to-back direction of the vehicle when the vehicle is in a head-on collision is provided at the front portion of the left and right front side frames, and each deformation portion and the front portion of the left and right front longitudinal beams are connected by left and right connecting parts. Thus, the front portion of the left and right front longitudinal beams is supported on the left and right deformation portions via the left and right connecting parts. The left and right connecting parts are configured to be more easily plastically deformed with respect to the collision load of a head-on collision than the left and right front longitudinal beams, and therefore plastically deform when the left and right deformation portions are compressed and deformed. Therefore, even if the left and right connecting parts are connected to the left and right deformation portions, it is possible to prevent the compression deformation of the left and right deformation portions from being hindered by the left and right connecting parts. Thus, the deformation stroke of the left and right deformation portions can be set longer in the front-to-back direction of the vehicle. Moreover, the left and right connecting parts are also used as collision load absorbing parts. With the above structure, the collision load absorption performance can be improved.

[0015] As described above, according to the vehicle front structure of the present disclosure, it is possible to prevent the power unit from colliding with the vehicle body during a head-on collision. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Embodiments of the present disclosure will be described in detail based on the following drawings.

[0017] Figure 1 It is a side view showing a partial structure of the front portion of a vehicle to which the vehicle front portion structure according to the embodiment is applied.

[0018] Figure 2 Yes Figure 1 The structure shown is a cross-sectional view showing a state in which the structure is cut slightly closer to the center in the vehicle width direction than the front side frame on the left side of the vehicle.

[0019] Figure 3 It is a top view showing a partial structure of the front portion of the vehicle.

[0020] Figure 4 This is a perspective view showing a partial structure of the front portion of the vehicle as viewed from the lower side at an oblique rear left side of the vehicle.

[0021] Figure 5 This is a perspective view showing a partial structure of the front portion of the vehicle as viewed from the upper side obliquely on the front left side of the vehicle.

[0022] Figure 6 The perspective view shows the partial structure of the front part of the vehicle when viewed from the upper side of the left oblique front of the vehicle. Figure 5 Compared to the enlarged scale figure.

[0023] Figure 7 This is a perspective view showing a partial structure of the front portion of the vehicle as viewed from the upper side at an oblique rear left side of the vehicle.

[0024] Figure 8 It is used to describe the deformation of the front part of the vehicle during a frontal collision. Figure 1 A schematic side view corresponding to a portion of the diagram. DETAILED DESCRIPTION

[0025] Below, refer to Figures 1 to 8 The vehicle front structure 10 of one embodiment of the present disclosure is described below. It should be noted that in the various figures, some of the figure marks are sometimes omitted due to the ease of viewing the figures. In addition, the arrows FR, LH, and UP appropriately recorded in the various figures represent the front of the vehicle (the direction of travel), the left side of the vehicle, and the top of the vehicle, respectively. In the following, when the front and rear, left and right, and up and down directions are simply used for description, unless otherwise specified, they represent 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.

[0026] (structure)

[0027] like Figures 1 to 8 As shown, a vehicle 12 to which the vehicle front structure 10 of the present embodiment is applied is a so-called frame vehicle in which a body 40 is supported by a ladder frame 14, and is a bus as an example. Although not shown in the figure, the body 40 of the vehicle 12 has a substantially rectangular parallelepiped shape. The vehicle 12 is an electric car as an example. First, the skeleton structure of the vehicle 12 is described in general.

[0028] The above-mentioned ladder frame 14 includes a pair of left and right side frames 16 and a plurality of cross beams 22, 24. The left and right side frames 16 extend in the front-rear direction at both sides of the vehicle 12 in the vehicle width direction. The plurality of cross beams 22, 24 are arranged at intervals in the front-rear direction and extend in the vehicle width direction. The left and right side frames 16 are connected in the vehicle width direction by the plurality of cross beams 22, 24.

[0029] The left and right side frames 16 are composed of left and right front side frames 18, left and right center side frames 20, and left and right rear side frames (not shown). The left and right front side frames 18 extend in the front-to-back direction at both sides of the front part of the vehicle 12 in the vehicle width direction. The left and right center side frames 20 extend in the front-to-back direction at both sides of the center part 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 part of the vehicle 12 in the vehicle width direction. The front side frame 18, the center side frame 20, and the rear side frame are formed into a square tube shape by, for example, steel, and have a closed cross-section that is rectangular when viewed from the front-to-back direction. It should be noted that a plurality of cross beams, not shown in the figure, are also provided between the left and right center side frames 20 and between the left and right rear side frames.

[0030] The front portion 18F of the left and right front side frames 18 extends linearly in the front-to-back direction. The front end portion of each front portion 18F (i.e., the front end portion of the left and right front side frames 18) is a deformation portion 18F1 that undergoes axial compression deformation in the front-to-back direction when the vehicle 12 is subjected to a head-on collision. A plurality of reinforcing ribs 19 extending in the up-down direction are formed on the left and right side surfaces of each deformation portion 18F1 in the front-to-back direction as an example. As a result, each deformation portion 18F1 is more fragile with respect to the load in the front-to-back direction than other portions of each front portion 18F. The middle portions of each front portion 18F in the front-to-back direction are connected in the vehicle width direction by a cross beam 22. In addition, a suspension tower 26 is fixed to the outer side surface in the vehicle width direction of each front portion 18F.

[0031] The front portion of the rear portion 18R of the left and right front side frames 18 is a lower bent portion 18R1 that is inclined downwardly toward the rear side, and the rear portion extends in a straight line in the front-to-rear direction. Each rear portion 18R is bent into a substantially crank shape at the bent portions 181 and 182 on the front and rear sides of the lower bent portion 18R1. The front bent portion 181 is bent to bulge toward the upper side and the rear side, and the rear bent portion 182 is bent to bulge toward the lower side and the front side. The front portion of each lower bent portion 18R1 (i.e., the front portion of each rear portion 18R) is connected in the vehicle width direction by a cross beam 24. The front end portion of the left and right central side frames 20 is coupled to the rear end portion of each rear portion 18R.

[0032] An electric motor 32 ( Figures 4 to 7 The motor 32 is supported on the left and right front side frames 18 via the cross beams 22, 24, support members not shown, etc. An electronic unit 34 for controlling the power supplied to the motor 32 is arranged above the motor 32. The electronic unit 34 is supported on the left and right front side frames 18 via a support frame 36. The support frame 36, as an example, has a pair of front and rear cross-bracing frame parts (the reference numerals are omitted) spanned between the left and right front side frames 18 and a pair of left and right side frame parts (the reference numerals are omitted) spanned between the front and rear cross-bracing frame parts, and has a ladder shape when viewed from above. The motor 32 and the electronic unit 34 constitute the power unit 30.

[0033] The vehicle body 40 supported from below by the ladder frame 14 of the above structure includes a floor panel 44 constituting a floor portion of a vehicle cabin 42 and a pair of left and right front longitudinal beams 48. The floor panel 44 includes a front floor panel 46 constituting a floor portion of the front portion of the vehicle cabin 42, a center floor panel 47 constituting a floor portion of a middle portion in the front-rear direction of the vehicle cabin 42, and a rear floor panel (not shown) constituting a floor portion of the rear portion of the vehicle cabin 42. The front floor panel 46, the center floor panel 47, and the rear floor panel are formed of, for example, steel plates.

[0034] The front portion of the front floor panel 46 is a driver's seat floor portion 46F extending in the front-to-back direction and the vehicle width direction. The rear portion of the front floor panel 46 is an inclined portion 46R inclined downwardly toward the rear side of the vehicle. The driver's seat floor portion 46F is separately arranged on the upper side relative to the front portion 18F of the left and right front side frames 18, and the inclined portion 46R is separately arranged on the upper side relative to the rear portion 18R of the left and right front side frames 18. The aforementioned electronic unit 34 is arranged below the driver's seat floor portion 46F. The front end portion of the central floor panel 47 is coupled to the rear end portion of the inclined portion 46R. The central floor panel 47 extends in the front-to-back direction and the vehicle width direction. A battery (not shown) storing power for supplying to the aforementioned motor 32 is arranged below the central floor panel 47. The high-voltage power supplied from the battery to the electronic unit 34 is controlled by the electronic unit 34 and supplied to the motor 32.

[0035] The front floor panel 46 is supported on the left and right front side frames 18 via a pair of left and right front longitudinal beams 48. The left and right front longitudinal beams 48 constitute a part of the vehicle body 40, and extend in the front-to-back direction at the upper side corresponding to the left and right front side frames 18 and at the outer side in the vehicle width direction. 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 46 by welding or the like. In detail, each front longitudinal beam 48 has a hat-shaped cross section that opens to the upper side when viewed from the front-to-back direction, and is joined to the lower surface of the front floor panel 46 at the left and right flange portions (the reference numerals are omitted) provided at the upper end. Thus, a closed cross section extending in the front-to-back direction of the vehicle is formed by each front longitudinal beam 48 and the front floor panel 46.

[0036] The front portion 48F of the left and right front longitudinal beams 48 extends linearly in the front-to-back direction and is joined to the lower surface of the driver's seat floor portion 46F of the front floor panel 46. The rear portion 48R of the left and right front longitudinal beams 48 is an upper bent portion 48R inclined downwardly toward the rear side of the vehicle and is joined to the lower surface of the inclined portion 46R of the front floor panel 46. Each upper bent portion 48R is bent into a substantially crank shape at the bent portions 481 and 482 on the front and rear sides. The bent portion 481 on the front side is bent to bulge toward the upper side and the rear side, and the bent portion 482 on the rear side is bent to bulge toward the lower side and the front side.

[0037] A front cross member 50 extending in the vehicle width direction is disposed 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 toward the front side when viewed in the vehicle width direction. A flange portion that overlaps with, for example, the rear surface of the front cross member 50 is provided at the front end portions of the left and right front longitudinal beams 48, 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 via the front cross member 50.

[0038] Both ends of the front cross beam 50 in the vehicle width direction are supported on the front ends of the left and right front side frames 18 (i.e., each deformation portion 18F1) via the left and right front side column components 52. The left and right front side column components 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 column component 52 is fixed to the front cross beam 50 by means of welding, bolting, etc., such as a flange portion not shown formed at the upper end. The lower end of each front side column component 52 is fixed to the front side frame 18 via a bracket 54. Each bracket 54 is fixed to the outer surface of each deformation portion 18F1 in the vehicle width direction by means of welding, etc. Each front side column component 52 is placed on the upper surface of each bracket 54 and fixed to each bracket 54 by means of bolting, etc.

[0039] The front end of each upper bent portion 48R in the left and right front longitudinal beams 48 is supported on the left and right front side frames 18 via the left and right rear side column components 56. The left and right rear side column components 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 column component 56 fixes a flange portion formed at the upper end to the front end of each upper bent portion 48R by welding or other means. The lower end of each rear side column component 56 is fixed to the front side frame 18 via a bracket 58. Each bracket 58 is fixed to the outer surface of the front end of each upper bent portion 48R in the vehicle width direction by welding or other means. Each rear side column component 56 is placed on the upper surface of each bracket 58 and fixed to each bracket 58 by bolt fastening or other means.

[0040] The left and right front longitudinal beams 48 are supported from below by the left and right front side frames 18 via the above-mentioned front cross beam 50, front side pillar member 52, bracket 54, rear side pillar member 56, and bracket 58. Furthermore, the front floor panel 46 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 46.

[0041] The front end portions of the upper bent portions 48R of the left and right front longitudinal beams 48 are connected to the seat cross beam 62 (see Figure 2 as well as Figure 3 ) and are connected in the vehicle width direction. The seat cross beam 62 is equivalent to the "cross beam" in the present disclosure. The seat cross beam 62 is formed into a square tube shape by, for example, steel, and extends in the vehicle width direction. Both ends of the seat cross beam 62 in the vehicle width direction protrude outward in the vehicle width direction compared to the left and right front longitudinal beams 48. The seat cross beam 62 is connected to the front end of each upper side bent portion 48R by welding or the like. The rear end of the driver's seat floor portion 46F is connected to the upper surface of the seat cross beam 62 by welding or the like. The seat cross beam 62 supports the front end of the seat frame 64 from the lower side.

[0042] The seat frame 64 is a frame that supports the driver's seat 66, which is a seat of the vehicle 12, from the lower side. The seat frame 64 includes a pair of left and right vertical portions 641 extending in the up-down direction and a horizontal portion 642 extending rearward from the upper ends of the left and right vertical portions 641. An oblique portion 643 is provided in an oblique manner between the lower end of the vertical portion 641 and the middle portion in the front-rear direction of the horizontal portion 642. The lower end of the vertical portion 641 is fixed to the rear end of the driver's seat floor portion 46F and the seat cross member 62 by bolt fastening or the like. The rear end of the horizontal portion 642 is fixed to the middle portion in the up-down direction of a pair of left and right pillars 68 erected from the front end of the center floor panel 47.

[0043] The left and right pillars 68 are formed into a square tube shape by, for example, steel, extending in the up-down direction and arranged at intervals in the vehicle width direction. A plurality of passenger seats 70 are arranged on the rear side of the left and right pillars 68. The plurality of passenger seats 70 are arranged in the vehicle width direction and fixed to the left and right pillars 68 via brackets or the like. It should be noted that, although not shown in the figure, a plurality of passenger seats not shown in the figure are also provided in the rear part of the vehicle room 42.

[0044] like Figure 1 , Figure 2 , Figures 4 to 8 As shown, the deformed portion 18F1 of the left and right front side frames 18 and the front portions 48F of the left and right front longitudinal beams 48 are connected by left and right connecting members 72. Figure 4 as well as Figure 7 As shown, the left and right connecting members 72 include upper fixing portions 74 fixed to the front portions 48F of the left and right front longitudinal beams 48, and lower fixing portions 76 fixed to the left and right front side pillar members 52 and the bracket 54. Figure 5 ), an intermediate connecting portion 78 connecting the upper fixing portion 74 and the lower fixing portion 76. The upper fixing portion 74, the lower fixing portion 76, and the intermediate connecting portion 78 are manufactured by press-forming a steel plate, for example.

[0045] Each connecting member 72 is arranged at the vehicle rear of the front side pillar member 52 in an uphill tilted posture toward the vehicle rear side, and is bridged in an oblique manner between the front side pillar member 52 and the middle portion in the front-rear direction of the front portion 48F of the front longitudinal beam 48. The connecting member 72 forms the middle connecting portion 78 and its periphery into an L-shaped cross section (i.e., an open cross-sectional shape). The connecting member 72 is configured to be more easily plastically deformed than the front longitudinal beam 48 with respect to the collision load of the frontal collision of the vehicle 12.

[0046] (Function and Effect)

[0047] Next, the operation and effects of this embodiment will be described.

[0048] In the vehicle front structure 10 having the above structure, the left and right front side frames 18 constituting the front part of the ladder frame 14 of the vehicle 12 extend in the front-rear direction at both sides in the vehicle width direction corresponding to the power unit 30, and support the power unit 30. On the upper sides of the left and right front side frames 18, the left and right front longitudinal beams 48 extend in the front-rear direction. The left and right front longitudinal beams 48 are supported by the left and right front side frames 18, and constitute a part of the vehicle body 40.

[0049] The rear portions 18R, 48R of the left and right front side frames 18 and the left and right front longitudinal beams 48 have a lower bent portion 18R1 and an upper bent portion 48R that are inclined downwardly toward the rear side of the vehicle. Therefore, when the vehicle 12 is hit head-on, stress is concentrated on the bent portions 181, 182, 481, 482 of the lower bent portion 18R1 and the upper bent portion 48R, and the lower bent portion 18R1 and the upper bent portion 48R are deformed at these bent portions 181, 182, 481, 482 (see FIG. 1 ). Figure 8 The front side frame 18 and the front side member 48 are indicated by two-dot chain lines in the figure. The collision load can be absorbed by this deformation.

[0050] Furthermore, by the above deformation, the left and right front side frames 18 and the left and right front longitudinal beams 48 are displaced to the upper and oblique rear side of the vehicle in a state of being parallel or substantially parallel to each other. At this time, the power unit 30 disposed between the left and right front side frames 18 and supported by the left and right front side frames 18 and the vehicle body 40, a part of which is constituted by the left and right front longitudinal beams 48, are displaced to the upper and oblique rear side of the vehicle together. Thus, the power unit 30 can be prevented from colliding with the vehicle body 40.

[0051] Furthermore, in the present embodiment, the vehicle body 40 has a front floor panel 46, which is disposed above the vehicle of the power unit 30 and supported by the left and right front longitudinal beams 48, constituting the floor portion of the vehicle interior 42. When the power unit 30 is displaced obliquely upward to the rear of the vehicle as described above, the front floor panel 46 is displaced obliquely upward to the rear of the vehicle together with the power unit 30. This prevents the electronic unit 34 of the power unit 30 from colliding with the lower surface of the front floor panel 46, thereby preventing damage to the electronic unit 30 caused by the collision. Furthermore, the front floor panel 46 ( Figure 8 The vehicle occupants can be easily protected by retreating to the upper and oblique rear side of the vehicle (not shown in the figure), i.e., to the side opposite to the collision object with which the vehicle collides.

[0052] In the present embodiment, the front end portions of the upper bent portions 48R of the left and right front longitudinal beams 48 are connected by the seat cross beam 62 (see Figure 2 as well as Figure 3) and are connected in the vehicle width direction. Thus, for example, the deformation of each upper bent portion 48R in the left and right front longitudinal beams 48 can be stabilized.

[0053] Furthermore, the seat cross beam 62 supports the front end of the seat frame 64 supporting the driver's seat 66 of the vehicle 12. When the vehicle 12 is hit head-on, the left and right front longitudinal beams 48 are deformed at the upper bent portions 48R, and the seat cross beam 62 is displaced toward the upper and oblique rear side of the vehicle together with the left and right front longitudinal beams 48 and the seat frame 64. As a result, the driver's seat 66 supported by the seat frame 64 can be moved away toward the side opposite to the collision object.

[0054] Furthermore, in the present embodiment, a deformation portion 18F1 that is compressed and deformed in the front-to-rear direction of the vehicle when the vehicle is subjected to a frontal collision is provided at the front portion of the left and right front side frames 18, and each deformation portion 18F1 and the front portion of the left and right front longitudinal beams 48 are connected by the left and right connecting members 72. Thus, the front portion of the left and right front longitudinal beams 48 is supported by the left and right deformation portions 18F1 via the left and right connecting members 72. As a result, the support rigidity of the front portion 48F of the left and right front longitudinal beams 48 for the front floor panel 46 can be increased under normal circumstances.

[0055] Moreover, the left and right connecting members 72 are configured to be more easily plastically deformed with respect to the collision load of the frontal collision than the left and right front longitudinal beams 48, and therefore plastically deform when the left and right deforming parts 18F1 are compressed and deformed. Therefore, even if the left and right connecting members 72 are connected to the left and right deforming parts 18F1, it is possible to prevent the compression deformation of the left and right deforming parts 18F1 from being hindered by the left and right connecting members 72. Thus, the deformation stroke of the left and right deforming parts 18F1 can be set longer in the front-rear direction. Moreover, the left and right connecting members 72 are also used as collision load absorbing members. With the above structure, the collision load absorption performance can be improved.

[0056] Furthermore, the left and right connecting members 72 are arranged to be inclined upwardly toward the rear side of the vehicle. Therefore, the upper end portions of the left and right connecting members 72 can be connected to the middle portion in the front-to-rear direction of the front portion 48F of the left and right front longitudinal beams 48. Thus, the bending of the middle portion in the front-to-rear direction of the front portion 48F can be suppressed by the left and right connecting members 72 under normal circumstances. As a result, the support rigidity of the front portion 48F for the front floor panel 46 can be effectively improved.

[0057] Furthermore, in the present embodiment, both ends in the vehicle width direction of the front cross member 50 connected to the front ends of the left and right front longitudinal members 48 are supported by the deformation portions 18F1 of the left and right front side frames 18 via the left and right front side pillar members 52. The left and right connecting members 72 are arranged behind the left and right front side pillar members 52 and are spanned in an oblique manner between the left and right front side pillar members 52 and the left and right front longitudinal members 48. Thus, the left and right front side pillar members 52 and the left and right front longitudinal members 48 can be reinforced by the oblique left and right connecting members 72 in normal times.

[0058] It should be noted that, in the above-mentioned embodiment, the left and right connecting members 72 are structured to include a portion formed into an open cross-section shape, but the present invention is not limited thereto, and the structure of the left and right connecting members can be appropriately changed. It is also possible to form a structure in which the left and right connecting members are manufactured by, for example, a cylindrical material.

[0059] Furthermore, in the above-described embodiment, the front end portions of the upper bent portions 48R of the left and right front longitudinal members 48 are connected in the vehicle width direction, and the front end portions of the seat frames 64 are supported by the seat cross beam 62. However, the present invention is not limited thereto. The arrangement positions of the cross beam connecting the left and right front longitudinal members 48 in the vehicle width direction and the seat frames can be changed as appropriate.

[0060] Furthermore, in the above-described embodiment, the driver's seat 66 is supported by the seat frame 64, but the present invention is not limited thereto, and the seat supported by the seat frame may be other than the driver's seat (eg, a passenger seat).

[0061] Furthermore, in the above-mentioned embodiment, the left and right connecting members 72 are provided between the left and right front column members 52 (column members) and the left and right front longitudinal beams 48 in an oblique manner, but the present invention is not limited thereto. For example, a structure may be formed in which the lower ends of the left and right connecting members are connected to the deformation portions of the left and right front side frames without passing through the left and right column members.

[0062] In addition, the present disclosure can be implemented with various modifications within the scope of the present disclosure. Furthermore, it is needless to say that the scope of rights of the present disclosure is not limited to the above-mentioned embodiments.

Claims

1. A vehicle front structure comprising: A power unit is arranged at the front of the vehicle; Left and right front side frames extend in the front-rear direction of the vehicle at both sides in the vehicle width direction corresponding to the power unit, constitute the front part of the frame of the vehicle, support the power unit, and have a lower side bent portion inclined downhill toward the rear side of the vehicle formed at the rear part of each of the left and right front side frames; and The left and right front longitudinal beams extend in the front-rear direction of the vehicle at the upper side of the left and right front side frames, are supported by the left and right front side frames, and constitute a part of the vehicle body, and an upper side bending portion inclined downwardly toward the rear side of the vehicle is formed at the rear portion of each of the left and right front longitudinal beams. A deformation portion is provided at the front portion of the left and right front side frames so as to be compressed and deformed in the front-rear direction of the vehicle when the vehicle is hit head-on. The front portions of the left and right front longitudinal beams and the respective deformation portions are connected by left and right connecting members, and the left and right connecting members are configured to be more easily plastically deformed than the left and right front longitudinal beams with respect to a collision load of a frontal collision. A front cross member extending in the vehicle width direction is arranged at the front end portions of the left and right front longitudinal members. Both ends of the front cross member in the vehicle width direction are supported by the deformation portions via left and right front side pillar members. The left and right connecting members are respectively arranged at the vehicle rear side of the front side pillar member to be inclined upward toward the vehicle rear side, and are bridged in an oblique manner between the front side pillar member and the front-rear middle portion of the front side member.

2. The vehicle front structure according to claim 1, in, The vehicle body includes a floor member that is disposed above the power unit in the vehicle and supported by the left and right front side members to constitute a floor portion of a vehicle compartment.

3. The vehicle front structure according to claim 1 or 2, in, The vehicle front structure includes a cross member connecting front end portions of the upper bent portions in a vehicle width direction.

4. The vehicle front structure according to claim 3, in, The vehicle front structure includes a seat frame whose front end portion is supported by the cross member and supports a seat of the vehicle.

5. The vehicle front structure according to claim 1 or 2, in, The left and right front side frames constitute a part of the ladder frame.

6. The vehicle front structure according to claim 1 or 2, in, The power unit includes an electric motor and an electronic unit. The electronic unit is disposed on an upper side of the vehicle with respect to the electric motor and controls electric power supplied to the electric motor.

7. The vehicle front structure according to claim 4, in, The seat is a driver's seat.

8. The vehicle front structure according to claim 1, in, The connecting member includes a portion formed in an open cross-sectional shape.

Images