JP6477530B2 - Vehicle skeleton structure - Google Patents

Description

  The present invention relates to a vehicle skeleton structure.

  2. Description of the Related Art An automobile body structure including a fiber reinforced resin member is known (see Patent Document 1 and Patent Document 2). For example, Patent Document 1 below discloses a vehicle body structure in which a dash panel lower or the like is made of a fiber reinforced resin. Briefly describing this structure, a hollow front inclined portion is integrally extended from the front portion of the vehicle body floor to the front upper side, and a core for increasing the strength at the time of a frontal collision is inside the front inclined portion. Has been placed. In addition, a solid front wall is erected from the front end of the front inclined portion, and a lower end of a dash panel lower made of a fiber-reinforced resin is joined to the front wall. Furthermore, the mounting base is fixed so that it may straddle from the front surface of a front wall to the front surface of a front side inclination part, and this mounting base supports the front side frame. In such a structure, the collision load at the time of frontal collision is transmitted from the front side frame to the front inclined portion with increased strength via the mounting base, so that the collision load is dispersed and the side sill (rocker) side or The collision load is transmitted to the floor tunnel side. And thereby, the collision load which should be borne by the dash panel lower made of fiber reinforced resin is kept small.

Japanese Patent Laying-Open No. 2015-182587 Japanese Patent Laying-Open No. 2015-193362

  By the way, although the vehicle body structure disclosed in Patent Document 1 includes a floor tunnel portion, there is a vehicle that does not include a floor tunnel portion from the viewpoint of, for example, vehicle space expansion. For example, in such a vehicle, It is desirable to transmit the collision load at the time of frontal collision more efficiently to the rocker (side sill) side than in the case of the vehicle body structure disclosed in Patent Document 1. Further, according to the above prior art, there is room for improvement in that the load is efficiently transmitted to the rocker side when, for example, a load is applied to bend the front side frame outward in the vehicle width direction at the time of a frontal collision. .

  An object of the present invention is to obtain a vehicle skeleton structure capable of efficiently transmitting a collision load at the time of a frontal collision to the rocker side in consideration of the above fact.

  The vehicle skeleton structure according to the first aspect of the present invention includes a rocker disposed at a lower end portion of a side portion of a cabin with a vehicle longitudinal direction as a longitudinal direction, and an upper side of a dash portion that separates the cabin and the power unit chamber. A dash panel made of fiber-reinforced resin, and a closed cross-sectional structure extending in the vehicle width direction and connected to the dash panel by forming a lower side of the dash portion, and a portion outside the vehicle width direction In addition, a metal dash cross member fixed with the rear side lower portion being abutted against the rocker, and a vehicle front-rear direction at the side of the power unit chamber is disposed as a longitudinal direction, and the metal dash cross member projects against the dash cross member. The front side member fixed in the contact state, and the lower outer plate of the front pillar erected from the front end side of the rocker to the vehicle upper side A main body portion that is configured and joined to the rocker; and a front-side extension portion that extends from the main body portion to the vehicle front oblique vehicle width direction inner side and is joined to the side surface portion of the front side member on the vehicle width direction outer side. And a metal front pillar lower outer panel.

  According to the above configuration, the metal dash cross member is connected to the lower end side of the fiber reinforced resin dash panel, and the dash cross member has a closed cross-sectional structure extending in the vehicle width direction so that the vehicle front side The rigidity against the load from the side is increased. The dash cross member is fixed in a state where the front side member is abutted against the dash cross member, and the lower part on the rear side of the dash cross member on the outer side in the vehicle width direction is fixed in a state where it is abutted against the rocker. For this reason, the collision load at the time of the frontal collision is transmitted from the front side member to the rocker via the dash cross member, so that the load for deforming the fiber reinforced resin dash panel is reduced.

  The metal front pillar lower outer panel has a main body part joined to the rocker, and a front extension part extending from the main body part toward the vehicle front diagonally in the vehicle width direction is an outer side in the vehicle width direction of the front side member. It is joined to the side part. Therefore, at the time of a frontal collision, the front side member can be supported from the outside in the vehicle width direction by the front pillar lower outer panel. Therefore, when a load acts to bend the front side member outward in the vehicle width direction, the load is supported by the front pillar lower outer panel, and deformation of the front side member in the vehicle width direction outside is suppressed. Is stably transmitted. Further, when a collision load is transmitted from the front side member to the front extension portion of the front pillar lower outer panel at the time of a frontal collision, the load is transmitted to the rocker via the main body portion of the front pillar lower outer panel.

  A vehicle skeleton structure according to a second aspect of the present invention is the vehicle skeleton structure according to the first aspect, wherein the front extension portion is an adjacent portion on a lower side of a portion of the dash cross member where the front side member is abutted. And a second fixed portion fixed to the lower surface portion side of the front side member.

  According to the above configuration, the front side member is supported more stably by the front pillar lower outer panel at the time of a frontal collision, so that the collision load input to the front side member can be transmitted more stably.

  The vehicle skeleton structure according to a third aspect of the present invention is the vehicle skeleton structure according to the first or second aspect, wherein an upper first ridge line is formed at an upper end edge of the front side member on the outer side in the vehicle width direction, A lower first ridge line is formed at the lower end edge of the front side member in the vehicle width direction outside, an upper second ridge line is formed at the upper end edge of the rocker in the vehicle width direction outer side, and the rocker in the vehicle width direction outer side. A lower second ridge line is formed at a lower edge of the upper pillar, and the front pillar lower outer panel is continuously disposed on the upper first ridge line and continuously disposed on the upper second ridge line; And a lower third ridge line continuously disposed on the lower first ridge line and continuously disposed on the lower second ridge line.

  According to the above configuration, a part of the collision load at the time of the frontal collision is transmitted from the upper first ridge line of the front side member to the upper second ridge line of the rocker via the upper third ridge line of the front pillar lower outer panel. Further, the other part of the collision load at the time of the frontal collision is transmitted from the lower first ridge line of the front side member to the lower second ridge line of the rocker via the lower third ridge line of the front pillar lower outer panel. Thus, at the time of a frontal collision, the collision load can be efficiently transmitted from the front side member to the rocker via the front pillar lower outer panel.

  As described above, according to the vehicle skeleton structure of the present invention, there is an excellent effect that the collision load at the time of the frontal collision can be efficiently transmitted to the rocker side.

1 is a perspective view showing a vehicle body provided with a vehicle skeleton structure according to an embodiment of the present invention. It is a disassembled perspective view which decomposes | disassembles and shows a part of left side of the vehicle body of FIG. It is a bottom view which shows a part of vehicle body of FIG. It is a side view which shows a part of vehicle body of FIG. FIG. 2 is a side view showing a part of the vehicle body of FIG. 1 with a front pillar lower outer panel and the like removed. FIG. 6 is an enlarged side sectional view showing a state cut along line 6-6 in FIG. 1. FIG. 2 is a perspective view showing the dash portion of the vehicle body of FIG. 1 and its surroundings as seen from the obliquely rear side above the vehicle. FIG. 2 is a plan view showing a part of the vehicle body of FIG. 1 as viewed from above the vehicle with a cowl, a dash panel and the like removed. It is a perspective view which expands and shows the simple substance of the dash cross gusset reinforcement shown by FIG.

  A vehicle skeleton structure according to an embodiment of the present invention will be described with reference to FIGS. In these drawings, an arrow FR appropriately shown indicates the vehicle front side, an arrow UP indicates the vehicle upper side, and an arrow W indicates the vehicle width direction. Hereinafter, when simply using the front-rear, up-down, left-right directions, the front-rear direction in the vehicle front-rear direction, the up-down direction in the vehicle up-down direction, and the left-right direction in the traveling direction are indicated unless otherwise specified.

(Configuration of the embodiment)
FIG. 1 is a perspective view of a vehicle body having a vehicle skeleton structure according to an embodiment of the present invention. In FIG. 1, illustration of constituent members such as the upper part of the vehicle body and the front end part of the vehicle body is omitted as appropriate for the sake of clarity. Further, the vehicle skeleton structure of the present embodiment is basically symmetrical. An automobile (vehicle) 10 including the vehicle body 12 shown in FIG. 1 is an electric automobile as an example. In the automobile 10, a power unit chamber 14 and a cabin (vehicle compartment) 16 are separated by a dash portion (a vehicle body cabin front wall) 18.

  The bottom of the cabin 16 is constituted by a vehicle body floor 20. The vehicle body floor 20 is made of carbon fiber reinforced resin (CFRP) as an example. The front end portion of the vehicle body floor 20 is connected to the rear end portion of the dash portion 18 that forms the front wall of the cabin 16. In the present embodiment, in order to expand the space of the cabin 16, the tunnel skeleton portion is not provided in the vehicle width direction center portion of the vehicle body floor 20.

  FIG. 3 shows a bottom view of a part of the vehicle body 12 as viewed from the vehicle lower side. As shown in FIG. 3, a battery unit 80 (in the drawing, only the outline is simplified by a two-dot chain line) is disposed below the vehicle body floor 20. The battery unit 80 includes a battery (storage battery) (not shown) that stores electric power for driving an electric motor (not shown) for running the electric vehicle. The battery unit 80 accommodates the battery (not shown) in a battery case, and is attached to the lower surface side of the vehicle body 12 via a connecting member (not shown). In the present embodiment, the vehicle 10 is an electric vehicle, but the battery unit 80 is similarly provided in the case of a hybrid vehicle, for example.

(Configuration of rockers, etc.)
As shown in FIG. 1, a metal rocker (also referred to as “side sill”) 22 is disposed at the lower end of the side portion of the cabin 16 with the vehicle front-rear direction as a longitudinal direction. The rocker 22 is a skeleton member having a closed cross-sectional structure extending in the vehicle front-rear direction, and is disposed in a range including the lower edge side of the side door opening. The pair of left and right rockers 22 are connected in the vehicle width direction by a floor cross member 23. A plurality of floor cross members 23 are provided in the vehicle front-rear direction.

  In FIG. 2, a part of the left side of the vehicle body 12 is shown in an exploded perspective view. In FIG. 2, an arrow LH indicates the left side of the vehicle. Further, in FIG. 2, in order to show the cross-sectional structure of the rocker 22, the rocker 22 is shown in a state in which an intermediate portion in the vehicle front-rear direction is broken. As shown in FIG. 2, the rocker 22 includes a pair of left and right side wall portions 22B constituting a side surface, an upper wall portion 22A that connects the upper ends of the pair of left and right side wall portions 22B in the vehicle width direction, and a pair of left and right side wall portions. A lower wall portion 22C that connects the lower ends of 22B in the vehicle width direction. An upper ridge line 22L as an upper second ridge line is formed on the upper end edge of the rocker 22 on the outer side in the vehicle width direction, and a lower ridge line 22M as a lower second ridge line on the lower end edge of the rocker 22 on the outer side in the vehicle width direction. Is formed.

  Note that the upper wall portion 22A is a bent wall portion whose center in the vehicle width direction is set on the vehicle upper side with respect to both sides and is formed in an inverted V shape when viewed from the front of the vehicle. The rocker 22 includes a lateral rib 22D that connects the pair of left and right side wall portions 22B in the vehicle width direction, a vehicle width direction center portion (bent portion) of the upper wall portion 22A, and a vehicle width direction center portion of the lower wall portion 22C. And a vertical rib 22E that connects the vehicle in the vertical direction of the vehicle.

  FIG. 5 is a side view of a part of the front side of the vehicle body 12 with the front pillar lower outer panel 32 (see FIGS. 2 and 4) and the interposition member 74 (see FIG. 2), which will be described in detail later, removed. ing. As shown in FIG. 5, a notch 22 </ b> K is formed on the front end side of the rocker 22. An inclined end surface 22Kx that is inclined toward the vehicle rear side toward the vehicle lower side is formed on the front end surface upper portion 22K1 of the side wall portion 22B of the rocker 22 by the cutout portion 22K. Further, the front end surface lower portion 22K2 of the side wall portion 22B of the rocker 22 is an end surface that hangs downward from the lower end of the inclined end surface 22Kx by the notch portion 22K. That is, the front end surface lower portion 22K2 of the side wall portion 22B of the rocker 22 is located on the vehicle rear side from the upper end of the front end surface of the side wall portion 22B of the rocker 22.

(Outline of front pillar)
From the front end side of the rocker 22, a metal front pillar (also referred to as “A pillar”) 24 is erected on the vehicle upper side. Although not shown, the upper portion of the front pillar 24 is configured by a front pillar upper that is inclined toward the vehicle rear side toward the vehicle upper side, and the lower portion of the front pillar 24 is a front pillar lower extending substantially in the vehicle vertical direction. 26.

  As shown in FIG. 2, the front pillar lower 26 includes a front pillar lower inner panel 28 disposed on the vehicle interior side, and a front pillar lower reinforcement 30 disposed on the vehicle exterior side of the front pillar lower inner panel 28. And. In the following description, the front pillar lower inner panel 28 is abbreviated as “pillar lower inner 28”, and the front pillar lower reinforcement 30 is abbreviated as “pillar lower RF 30”.

  The pillar lower inner 28 is formed in a substantially hat shape whose opening is directed outward in the vehicle width direction in a plan view, and the pillar lower RF30 is formed in a substantially hat shape whose opening is directed inward in the vehicle width in a plan view. Has been. The front and rear flange portions of the pillar lower inner 28 and the pillar lower RF 30 are joined to each other by welding, thereby forming a skeleton portion having a closed cross-sectional shape extending substantially along the vehicle vertical direction. A lower flange portion 28A that is bent and extended inward in the vehicle width direction is formed at the lower end portion of the pillar lower inner 28. The lower flange portion 28A is formed on the inner side in the vehicle width direction of the upper wall portion 22A of the rocker 22. It is joined to this part by welding.

  A main body 34 of the front pillar lower outer panel 32 is disposed outside the passenger compartment of the pillar lower RF 30. In the following description, the front pillar lower outer panel 32 is abbreviated as “pillar lower outer 32”. The pillar lower outer 32 is made of metal (in this embodiment, made of aluminum die cast), and the main body 34 of the pillar lower outer 32 constitutes a lower outer plate of the front pillar 24 (an outer plate of the front pillar lower 26).

(Composition of pillar lower outer)
The upper part 34U of the main body part 34 of the pillar lower outer 32 is formed in a substantially hat shape with the opening directed inward in the vehicle width direction in a plan view, and the front and rear flange parts are formed on the front and rear flange parts of the pillar lower inner 28 and the pillar lower RF30. They are joined by welding. On the front side of the upper part 34U of the main body 34 of the pillar lower outer 32, a plurality of reinforcing ribs 34R are juxtaposed in the vehicle vertical direction.

  A lower portion 34L of the main body portion 34 of the pillar lower outer 32 includes an upper wall portion 34A, a side wall portion 34B, and a lower wall portion 34C. 34 A of upper walls are provided in the rear-end part side in the lower part 34L of the main-body part 34 of the pillar lower outer 32, are piled up on the vehicle width direction outer side part of the upper wall part 22A of the rocker 22, and are joined by welding. The side wall part 34B is overlapped with the side wall part 22B arranged outside the passenger compartment of the rocker 22 and joined by welding. Further, the upper surface portion of the lower wall portion 34C is joined by welding to the lower surface portion of the lower portion 74C of the interposed member 74 shown in the lower left in the drawing, and the upper surface portion of the lower portion 74C of the interposed member 74 is the lower wall portion 22C of the rocker 22. It is joined to the lower surface part of this by welding. That is, the lower wall portion 34 </ b> C of the pillar lower outer 32 is fixed to the lower wall portion 22 </ b> C of the rocker 22 through the interposition member 74. The intervening member 74 connects the upper part 74A and the lower part 74C disposed substantially along the vehicle longitudinal direction, and connects the rear end side of the upper part 74A and the front end side of the lower part 74C to the vehicle rear side as a whole. And an intermediate portion 74B arranged so as to be inclined to the side.

  In addition, the pillar lower outer 32 includes a front side extending portion 36 that extends from the main body portion 34 to the inside in the vehicle front oblique vehicle width direction. The front extending portion 36 includes a front wall portion 36C that forms a front surface facing outward in the vehicle front oblique vehicle width direction, and an upper wall portion 36B that is bent and extended from the upper end of the front wall portion 36C to the vehicle rear side. And a lower wall portion 36D as a first fixed portion that is bent and extended from the lower end of the front wall portion 36C toward the vehicle rear side. The front wall portion 36C has a portion on the outer side in the vehicle width direction that is curved obliquely forward inward in the vehicle width direction, and as a whole, inclines inward in the vehicle width direction toward the front side of the vehicle. Curved forward. Further, the upper wall portion 36B and the lower wall portion 36D are long components that are inclined inward in the vehicle width direction toward the vehicle front side as a whole in a vehicle plan view. The rear end of the lower wall portion 36D in the front extending portion 36 is continuous with the front end of the lower wall portion 34C of the main body portion 34 described above.

  In addition, a vertical wall portion 36A that is bent and extended from the rear end of the upper wall portion 36B to the vehicle upper side is formed, and the terminal on the vehicle width direction inner side of the upper wall portion 36B is bent to the vehicle upper side. An extended upper flange portion 36F is formed. Further, a first front flange portion 36G is continuously formed on the front end side of the front wall portion 36C, and a second front flange portion 36H as a second fixed portion is continuously formed on the front end side of the lower wall portion 36D. Is formed. The joining of the vertical wall portion 36A, the upper flange portion 36F, the first front flange portion 36G, and the second front flange portion 36H will be described later.

  Further, the pillar lower outer 32 has an upper ridge line 32L serving as an upper third ridge line and a lower third ridge line extending from the front end side of the front extending portion 36 to the rear end side of the main body portion 34 at a portion outside the vehicle width direction. A side ridgeline 32M is provided. On the front end side of the upper ridge line 32L and the lower ridge line 32M, first curved portions 32L1 and 32M1 that are curved toward the outer side in the vehicle width direction toward the vehicle rear side are set. In addition, second curved portions 32L2 and 32M2 that are curved toward the vehicle rear side toward the outer side in the vehicle width direction are set in the vehicle longitudinal direction intermediate portion of the upper ridge line 32L and the lower ridge line 32M. The rear ends of the first curved portions 32L1, 32M1 and the front ends of the second curved portions 32L2, 32M2 are connected in a straight line and are inclined outward in the vehicle width direction toward the vehicle rear side. Further, the upper ridge line 32L and the lower ridge line 32M extend along the vehicle front-rear direction on the vehicle rear side from the rear ends of the second curved portions 32L2, 32M2. 4, the upper ridge line 32L of the pillar lower outer 32 is continuously arranged on the upper ridge line 22L of the rocker 22, and the lower ridge line 32M of the pillar lower outer 32 is continuous with the lower ridge line 22M of the rocker 22. Is arranged.

(Dash configuration)
Next, the dash part 18 will be described. FIG. 6 shows an enlarged side sectional view taken along line 6-6 of FIG. As shown in FIG. 6, the upper side of the dash portion 18 is constituted by a dash panel 38, and the lower side of the dash portion 18 is constituted by a dash cross member 40 connected to the dash panel 38. The dash panel 38 is a plate-like member made of fiber reinforced resin (made of carbon fiber reinforced resin (CFRP) in the present embodiment), and the general portion 38A extends in a substantially vehicle vertical direction and a substantially vehicle width direction. As the resin used for the fiber reinforced resin material, for example, various known thermoplastic resins can be used. For the reinforcing fiber contained in the fiber reinforced resin material, various known fibers such as glass fiber and metal fiber may be used instead of carbon fiber.

  Both side portions 38S in the vehicle width direction of the general portion 38A of the dash panel 38 shown in FIG. 7 are inclined toward the vehicle rear side toward the outer side in the vehicle width direction. Further, the upper end portion of the dash panel 38 is coupled to the cowl 54. The cowl 54 has a bowl shape, extends substantially in the vehicle width direction along the lower edge of the windshield (not shown), and connects the pair of left and right front pillars 24. The cowl 54 has a function of separating air and water entering the cabin 16, and a wiper mechanism (not shown) is housed in the cross section.

  As shown in FIG. 6, the adhesive is applied to the lower end portion of the general portion 38 </ b> A of the dash panel 38 with the upper flange portion 42 </ b> F constituting the front upper end portion of the dash cross member 40 being overlapped from the vehicle front side. And are fastened with a fastener. In the figure, a fastening line is indicated by a one-dot chain line 39 instead of the fastener. Further, an L-shaped attachment portion 38B that is bent and extended from the lower end of the general portion 38A of the dash panel 38 to the vehicle rear side and further bent and extended to the vehicle lower side is formed. The L-shaped attachment portion 38B is joined by an adhesive in a state where the upper end portion 40A of the dash cross member 40 is overlapped.

  The dash cross member 40 is a member made of metal (made of steel, aluminum alloy, etc.), and is formed by aluminum extrusion as an example in the present embodiment, and has a closed cross-sectional structure extending in the vehicle width direction. Yes. The dash cross member 40 includes a front wall portion 42 that constitutes the front surface, and a rear wall portion 44 that constitutes the rear surface and is disposed opposite to the front wall portion 42. The front wall portion 42 and the rear wall portion 44 are bent in a crank shape in a side view of the vehicle. The upper part 42A and the lower part 42C of the front wall part 42 and the upper part 44A and the lower part 44C of the rear wall part 44 extend substantially in the vehicle vertical direction as viewed from the side of the vehicle. Further, a portion connecting the upper portion 42A and the lower portion 42C in the front wall portion 42 is an inclined portion 42B inclined toward the vehicle rear side toward the vehicle lower side in a side view of the vehicle, and similarly, the upper portion 44A and the lower portion 44C in the rear wall portion 44. The part which connects is made into the inclination part 44B which inclined to the vehicle rear side toward the vehicle lower side by the vehicle side view. In other words, the lower portion 42C of the front wall portion 42 is disposed on the vehicle rear side with respect to the upper portion 42A, and the lower wall portion 44 of the front wall portion 44 is disposed on the vehicle rear side with respect to the upper portion 44A.

  The front end portion of the upper flange portion 42F of the dash cross member 40 shown in FIG. 2 on the outer end portion in the vehicle width direction has an end portion 36A1 on the inner side in the vehicle width direction of the vertical wall portion 36A of the front extension portion 36 of the pillar lower outer 32. Are joined by welding. The lower surface portion of the lower wall portion 48 of the dash cross member 40 is joined to the upper surface portion of the lower portion 74C of the interposed member 74 by welding. Accordingly, the lower wall portion 34C of the pillar lower outer 32 is also fixed to the lower wall portion 48 of the dash cross member 40 via the lower portion 74C of the interposition member 74. Further, in the dash cross member 40, a portion from the inclined portion 42B to the lower portion 42C of the front wall portion 42 is joined to the upper surface portion of the intermediate portion 74B of the interposed member 74 by welding. The lower surface portion of the intermediate portion 74B of the interposed member 74 is joined to the upper surface portion of the lower wall portion 36D of the pillar lower outer 32 by welding.

  As shown in the partially enlarged view of FIG. 3, the intermediate portion 74B of the interposition member 74 is configured to include a portion on the inner side in the vehicle width direction from the lower wall portion 36D of the pillar lower outer 32 in a bottom view. Supplementally, the intermediate portion 74 </ b> B of the interposition member 74 is also disposed, for example, in the adjacent portion on the lower side of the portion 40 </ b> X where the front side member 60 is abutted in the dash cross member 40. Further, the intermediate portion 74B of the interposition member 74 is joined to the dash cross member 40 also at a portion on the inner side in the vehicle width direction from the lower wall portion 36D of the pillar lower outer 32 in a bottom view. Accordingly, the lower wall portion 36D of the front extension portion 36 of the pillar lower outer 32 is adjacent to the lower side of the portion 40X where the front side member 60 is abutted with the dash cross member 40 via the intermediate portion 74B of the interposition member 74. It is being fixed to the front part 42P side (refer the range of the double-headed arrow A of FIG.3 and FIG.5) from the part to the site | part 40Y abutted against the rocker 22.

  FIG. 8 is a plan view showing a part of the vehicle body 12 as viewed from above the vehicle. FIG. 8 shows a state in which the cowl 54 (see FIG. 1), the dash panel 38 (see FIG. 1), and the like are removed to make the drawing easier to see. As shown in FIG. 8, the front portion of the portion of the dash cross member 40 on the outer side in the vehicle width direction is inclined toward the rear side of the vehicle toward the outer side in the vehicle width direction in the vehicle plan view. In FIG. 8, the front portion of the portion of the dash cross member 40 on the outer side in the vehicle width direction is approximately the same as a line indicating the front end side of a dash cross gusset reinforcement 72 (hereinafter referred to as “dash cross gusset RF 72”). I'm doing it.

  As shown in FIG. 6, the front end portion of the vehicle body floor 20 is joined to the upper surface (rear surface) of the rear end portion of the inclined portion 44 </ b> B of the rear wall portion 44 of the dash cross member 40 by welding. As shown in FIG. 5, the rear upper surface (rear surface) of the inclined portion 44B of the rear wall portion 44 of the dash cross member 40 is abutted against the inclined end surface 22Kx of the front end surface upper portion 22K1 in the side wall portion 22B of the rocker 22. The rear surface of the lower portion 44C of the rear wall portion 44 is fixed in a state of being abutted against the front end surface lower portion 22K2 of the side wall portion 22B of the rocker 22. That is, the dash cross member 40 is fixed in a state in which the lower portion on the rear surface side is abutted against the rocker 22 at a portion outside the vehicle width direction.

  Further, as shown in FIG. 6, in the dash cross member 40, the upper end portion of the front wall portion 42 and the upper end of the rear wall portion 44 are connected in the vehicle front-rear direction by the upper wall portion 46. The lower end of the portion 42 and the lower end of the rear wall portion 44 are connected by the lower wall portion 48 in the vehicle front-rear direction. The upper flange portion 42F of the dash cross member 40 constitutes the upper end portion of the front wall portion 42, and is a portion that protrudes to the vehicle upper side from the upper wall portion 46. In addition, the front end portion of the battery unit 80 is fastened to the lower wall portion 48 using bolts 52A and nuts 52B. Further, the dash cross member 40 includes a lateral rib 50A that connects the inclined portion 42B of the front wall portion 42 and the inclined portion 44B of the rear wall portion 44 in the vehicle front-rear direction, and the inclined portion 42B and the rear wall portion 44 of the front wall portion 42. Vertical ribs 50B connecting the inclined portions 44B to the vehicle vertical direction.

(Configuration of front side members, etc.)
On the other hand, a power unit (not shown) is accommodated in the power unit chamber 14 set on the vehicle front side with respect to the dash portion 18 shown in FIG. A pair of left and right front side members 60 are disposed on both sides (side portions) in the vehicle width direction below the power unit chamber 14 with the vehicle front-rear direction as the longitudinal direction. The front side member 60 will be described later.

  Although not shown in FIG. 1, as shown in FIG. 8, a bumper reinforcement 58 (hereinafter abbreviated as “bumper RF 58”) is provided at the front end portion of the front side member 60 via an interposition member 56. It is fixed. The bumper RF58 is a metal skeleton member disposed on the front end side of the vehicle body 12 with the vehicle width direction as a longitudinal direction. The central portion of the bumper RF 58 in the vehicle width direction and the rear portions of the pair of left and right front side members 60 are connected by a pair of left and right diagonal members 62. The oblique member 62 is inclined outward in the vehicle width direction toward the vehicle rear side in a plan view of the vehicle and extends linearly. The pair of left and right diagonal members 62 may be formed as separate left and right bodies or may be formed as a single body on the left and right.

  The oblique member 62 is coupled to the bumper RF 58 by a coupling member 64 and is coupled to the front side member 60 by a coupling member 66. The connecting members 64 and 66 are made of die-cast metal (for example, aluminum alloy), and include fitted portions 64A and 66A in which the end portions of the oblique members 62 are fitted and joined. Reinforcing ribs 64B and 66B are formed on the outer peripheral sides of the fitted portions 64A and 66A. In addition, the connecting member 64 includes a mating portion 64C that is superimposed on the bumper RF58 and joined by welding. Further, the connecting member 66 includes an alignment portion 66C (see FIG. 2) that is overlapped with the front side member 60 in the vehicle width direction inner surface and the upper surface and joined by welding.

  A connecting member 66 shown in FIG. 2 includes a rear flange portion 66D joined to the front surface of the dash cross member 40 by welding. Further, the connecting member 66 includes an outer upper flange portion 66E joined by welding to the upper flange portion 36F on the inner side in the vehicle width direction of the front extension portion 36 of the pillar lower outer 32.

  Further, as shown in FIG. 1, an apron upper member 68 is disposed on the outer side in the vehicle width direction and on the upper side of the front side member 60. The apron upper member 68 extends in the vehicle front-rear direction on the front side of the upper portion of the front pillar lower 26. A suspension tower 70 is provided between the front side member 60 and the apron upper member 68.

  The front side member 60 is a metal member, and is formed by aluminum extrusion as an example in the present embodiment. The front side member may be a steel press product. As shown in FIG. 2, the front side member 60 has a closed cross-sectional structure extending in the vehicle front-rear direction. The front side member 60 includes a pair of left and right side wall portions 60B constituting the side surface, an upper wall portion 60A that connects the upper ends of the pair of left and right side wall portions 60B in the vehicle width direction, and a lower end of the pair of left and right side wall portions 60B. A lower wall portion 60C connected in the width direction.

  An upper ridge line 60L as an upper first ridge line is formed on the upper end edge of the front side member 60 on the outer side in the vehicle width direction, and a lower first ridge line is formed on the lower end edge of the front side member 60 on the outer side in the vehicle width direction. A lower ridge line 60M is formed. The front side member 60 includes a lateral rib 60D that connects the pair of left and right side wall portions 60B in the vehicle width direction, and a vertical rib 60E that connects the upper wall portion 60A and the lower wall portion 60C in the vehicle vertical direction. Yes.

  As shown in FIG. 5, the rear end portion of the front side member 60 is fixed in a state of being abutted against the front surface of the upper portion 42 </ b> A in the front wall portion 42 of the dash cross member 40. Further, as shown in FIG. 1, the first front flange portion 36G of the front extension portion 36 of the pillar lower outer 32 is joined to the side surface portion 60S of the front side member 60 on the vehicle width direction outer side by welding. 2 is joined to the lower surface 60F of the lower wall 60C of the front side member 60 shown in FIG. 2 by welding, so that the upper surface of the upper part 74A of the interposed member 74 shown in the lower side in the figure is joined. The lower surface part of 74A is joined to the upper surface part of the 2nd front flange part 36H of the front side extension part 36 of the pillar lower outer 32 by welding. That is, the second front flange portion 36 </ b> H of the front extension portion 36 of the pillar lower outer 32 is fixed to the lower surface portion 60 </ b> F side of the front side member 60. 4, the upper ridge line 32L of the pillar lower outer 32 is continuously arranged on the upper ridge line 60L of the front side member 60, and the lower ridge line 32M of the pillar lower outer 32 is a lower ridge line of the front side member 60. It is continuously arranged at 60M.

(Configuration of dash cross gusset RF)
On the other hand, as shown in FIG. 7, dash cross gussets RF72 as reinforcing members are disposed on both sides of the dash cross member 40 on the vehicle interior side in the vehicle width direction. As shown in FIG. 8, the dash cross gusset RF72 extends outward in the vehicle width direction from a portion corresponding to the vehicle rear side of the front side member 60 to a portion adjacent to the front portion of the rocker 22.

  FIG. 9 is a perspective view showing an enlarged state of the single unit of the dash cross gusset RF72 shown in FIG. 7 and FIG. In the drawing, an arrow UP, an arrow FR, and an arrow W indicate directions in a state where the dash cross gusset RF72 is joined to the dash cross member 40 (see FIG. 8) or the like. As shown in FIG. 9, the dash cross gusset RF72 includes a vertical wall portion 72A in which a bead 72X is formed, and an upper wall portion 72B that is bent and extended from the upper end of the vertical wall portion 72A to the vehicle front side. It has. As shown in FIG. 7, the vertical wall portion 72 </ b> A is disposed corresponding to the rear surface portion of the rear wall portion 44 of the dash cross member 40, and the upper wall portion 72 </ b> B is the upper surface of the upper wall portion 46 of the dash cross member 40. It arrange | positions corresponding to a part.

  As shown in FIG. 9, the dash cross gusset RF72 includes an upper flange portion 72C that is bent and extended from the front end of the upper wall portion 72B to the vehicle upper side. Further, the dash cross gusset RF72 includes an inner flange portion 72D that is bent and extended substantially inward in the vehicle width direction from a terminal on the vehicle width direction inner side of the vertical wall portion 72A, and a vehicle rear side from the lower end of the vertical wall portion 72A. A lower flange portion 72E that is bent and extended. As shown in FIG. 7, the upper flange portion 72 </ b> C is overlapped with the lower end side rear surface of the general portion 38 </ b> A of the dash panel 38 and joined by welding, and the inner flange portion 72 </ b> D and the lower flange portion 72 </ b> E are connected to the dash cross member 40. It is joined to the rear surface by welding.

  As shown in FIG. 9, the dash cross gusset RF72 includes a first outer flange portion 72F extending from the terminal on the vehicle width direction outer side of the upper wall portion 72B to the vehicle upper side, and a vehicle width direction of the vertical wall portion 72A. A second outer flange portion 72G extending from the outer terminal to the vehicle rear side. In the dash cross gusset RF72, the portion from the first outer flange portion 72F to the second outer flange portion 72G is the inner surface in the vehicle width direction of the pillar lower inner 28 (see FIG. 7) and the front end portion of the rocker 22 (see FIG. 7). In the vehicle width direction inner side (the upper surface and the vehicle width direction inner side surface).

(Operation and effect of the embodiment)
Next, the operation and effect of the above embodiment will be described.

  In the present embodiment, a metal dash cross member 40 is connected to the lower end side of the fiber reinforced resin dash panel 38 shown in FIG. 5, and the dash cross member 40 is a closed cross section extending in the vehicle width direction. By providing the structure, rigidity against a load from the front side of the vehicle is enhanced. Then, the metal front side member 60 is fixed to the dash cross member 40 while being abutted against the dash cross member 40, and the rear side lower portion of the dash cross member 40 at the outer side in the vehicle width direction is abutted against the rocker 22. It is fixed in the state. For this reason, the collision load at the time of a frontal collision is transmitted from the front side member 60 to the rocker 22 via the dash cross member 40, so the load for deforming the dash panel 38 made of fiber reinforced resin is reduced.

  Further, as shown in FIG. 4, the metal pillar lower outer 32 has a main body part 34 joined to the rocker 22 and a front side extension part extending from the main body part 34 toward the vehicle front diagonally in the vehicle width direction. 36 is joined to the side surface portion 60S of the front side member 60 on the outer side in the vehicle width direction. For this reason, the front side member 60 can be supported by the pillar lower outer 32 from the outside in the vehicle width direction at the time of a frontal collision. Therefore, when a load is applied to bend the front side member 60 outward in the vehicle width direction, the load is supported by the pillar lower outer 32, and deformation of the front side member 60 outward in the vehicle width direction is suppressed. Is stably transmitted. Further, when a collision load is transmitted from the front side member 60 to the front extension 36 of the pillar lower outer 32 at the time of a frontal collision, the load is transmitted to the rocker 22 via the main body 34 of the pillar lower outer 32.

  Further, in the present embodiment, the front side member 60 abuts the lower wall portion 36D of the front extension portion 36 of the pillar lower outer 32 shown in FIG. 3 via the intermediate portion 74B of the interposition member 74. It is fixed to the front surface part 42P side (refer to the range of the double-headed arrow A in FIGS. 3 and 5) from the adjacent part on the lower side of the formed part 40X to the part 40Y abutted against the rocker 22. The second front flange portion 36 </ b> H of the front extension portion 36 of the pillar lower outer 32 is fixed to the lower surface portion 60 </ b> F side of the front side member 60. For this reason, the front side member 60 is more stably supported by the pillar lower outer 32 at the time of a frontal collision, so that the collision load input to the front side member 60 can be transmitted more stably.

  As shown in FIG. 4, in the present embodiment, the upper ridge line 32 </ b> L of the pillar lower outer 32 is continuously disposed on the upper ridge line 60 </ b> L of the front side member 60 and is continuously disposed on the upper ridge line 22 </ b> L of the rocker 22. Has been. For this reason, a part of the collision load at the time of the frontal collision is transmitted from the upper ridge line 60L of the front side member 60 to the upper ridge line 22L of the rocker 22 via the upper ridge line 32L of the pillar lower outer 32. Further, the lower ridge line 32M of the pillar lower outer 32 is continuously disposed on the lower ridge line 60M of the front side member 60 and is continuously disposed on the lower ridge line 22M of the rocker 22. For this reason, another part of the collision load at the time of the frontal collision is transmitted from the lower ridge line 60M of the front side member 60 to the lower ridge line 22M of the rocker 22 via the lower ridge line 32M of the pillar lower outer 32. Thus, at the time of a frontal collision, a collision load can be efficiently transmitted from the front side member 60 to the rocker 22 via the pillar lower outer 32.

  Further, in the present embodiment, as shown in FIG. 8, the vehicle from the portion corresponding to the vehicle rear side of the front side member 60 to the portion adjacent to the front end portion of the rocker 22 is located on the vehicle interior side of the dash cross member 40. A dash cross gusset RF72 that extends outward in the width direction and is joined to the dash cross member 40 and the rocker 22 is disposed. For this reason, a part of the collision load at the time of the frontal collision is transmitted from the front side member 60 to the dash cross gusset RF72 via the dash cross member 40, and further transmitted from the dash cross gusset RF72 to the front end portion of the rocker 22. Therefore, deformation of the dash cross member 40 at the time of a frontal collision can be suppressed as compared with a configuration in which the dash cross gusset RF72 is not disposed, and a collision load at the time of a frontal collision can be more efficiently transmitted to the rocker 22 side.

  As described above, according to the vehicle skeleton structure of the present embodiment, the collision load at the time of a frontal collision can be efficiently transmitted to the rocker 22 side. As a result, the deformation of the cabin 16 can be effectively suppressed.

(Supplementary explanation of the embodiment)
The vehicle skeleton structure of the above embodiment is basically configured symmetrically, and a case has been described in which the front extension portions 36 of the pillar lower outer 32 shown in FIG. 1 and the like are provided on the left and right sides of the vehicle body. However, for example, a configuration in which the front extension portion (36) is provided only on the left side of the vehicle body or a configuration in which the front extension portion (36) is provided only on the right side of the vehicle body may be employed.

  In the above embodiment, the notch 22K is formed on the front end side of the rocker 22 shown in FIG. 5 and the like. For example, the notch (22K) is not formed on the front end side of the rocker, and The cross member may be configured to be fixed in a state where the cross member is located on the outer side in the vehicle width direction and the lower portion on the rear side is abutted against such a rocker.

  In the above embodiment, the lower wall portion 36D of the front extension 36 of the pillar lower outer 32 shown in FIG. 3 is brought into contact with the front side member 60 at the dash cross member 40 via the intermediate portion 74B of the interposition member 74. It is fixed to the front part 42P side (refer to the range of the double-headed arrow A in FIGS. 3 and 5) from the adjacent part on the lower side of the formed part 40X to the part 40Y butted against the rocker 22, but it extends forward A configuration in which the lower wall portion 36D is not provided in the portion can also be adopted. Moreover, in the said embodiment, although the 2nd front flange part 36H of the front side extension part 36 of the pillar lower outer 32 is being fixed to the lower surface part 60F side of the front side member 60, such a 2nd front is carried out to a front side extension part. A configuration in which the flange portion 36H is not provided can also be adopted.

  As a modification of the above embodiment, a portion corresponding to the lower wall portion 36D of the front extension 36 shown in FIG. 2 is directly fixed to the front surface 42P side of the dash cross member 40 without the interposition member 74 interposed therebetween. Such a configuration can also be adopted. Similarly, as a modification of the above-described embodiment, the portion corresponding to the second front flange portion 36H of the front side extension portion 36 shown in FIG. 2 is directly on the lower surface portion 60F side of the front side member 60 without the interposition member 74 interposed therebetween. It is also possible to adopt a configuration that is fixed to.

  As a modification of the above embodiment, the front pillar lower outer panel may not include the upper ridge line continuously disposed on the upper ridge line 60L of the front side member 60 shown in FIG. The upper ridge line continuously arranged on the ridge line 22L may not be provided. As a modification of the above embodiment, the front pillar lower outer panel may not include the lower ridge line continuously arranged on the lower ridge line 60 </ b> M of the front side member 60, or the lower ridge line 22 </ b> M of the rocker 22. It is not necessary to provide the lower ridge line continuously arranged in the.

  Furthermore, the concept of “continuously arranged on the ridge line” according to claim 3 includes, in addition to the case of being arranged completely continuously on the ridge line, for example, the ridge line (60L, 60M) as in the above embodiment. , 22L, 22M) including a case where it is arranged so as to be continuous through a step corresponding to the plate thickness of the pillar lower outer (32), that is, it is grasped as being substantially continuously arranged on the ridgeline. It is.

  In addition, the said embodiment and the above-mentioned some modification can be implemented combining suitably.

  Although an example of the present invention has been described above, the present invention is not limited to the above, and it is needless to say that various modifications can be made without departing from the spirit of the present invention. .

14 Power unit room 16 Cabin 18 Dash part 22 Rocker 22L Upper ridge line (upper second ridge line)
22M Lower ridgeline (lower second ridgeline)
24 Front Pillar 32 Front Pillar Lower Outer Panel 32L Upper Edge Line (Upper Third Edge Line)
32M Lower ridgeline (lower third ridgeline)
34 Main body part 36 Front side extension part 36D Lower wall part (first fixed part)
36H Second front flange (second fixed part)
38 dash panel 40 dash cross member 40X part where front side member is abutted 40Y part where abutting against rocker 42P front part 60 front side member 60F lower part 60L upper edge line (upper first edge line)
60M Lower ridgeline (lower first ridgeline)
60S Front side member lateral side of vehicle width direction outside

Claims (3)

A rocker disposed at the lower end of the side of the cabin with the longitudinal direction of the vehicle as the longitudinal direction;
A dash panel made of fiber reinforced resin that constitutes an upper side of a dash portion that separates the cabin and the power unit chamber;
The lower portion of the dash portion is configured to be connected to the dash panel, and has a closed cross-sectional structure extending in the vehicle width direction. The lower portion on the rear side of the vehicle width direction is abutted against the rocker. A metal dash cross member fixed in the
A front side member that is disposed in the side of the power unit chamber with the longitudinal direction of the vehicle as a longitudinal direction and fixed in a state of being abutted against the dash cross member;
A lower outer plate of the front pillar that is erected from the front end side of the rocker to the vehicle upper side, and a main body portion joined to the rocker, and extends from the main body portion to the vehicle front diagonally in the vehicle width direction. And a front extension member joined to a side surface portion of the front side member on the vehicle width direction outer side, and a metal front pillar lower outer panel,
A vehicle skeleton structure.   The front-side extension portion is fixed to the front side from the adjacent portion below the portion where the front side member is abutted to the portion abutted against the rocker in the dash cross member. The vehicle skeleton structure according to claim 1, further comprising a portion and a second fixed portion fixed to a lower surface portion side of the front side member. An upper first ridge line is formed at the upper end edge of the front side member in the vehicle width direction, and a lower first ridge line is formed at the lower end edge of the front side member in the vehicle width direction,
An upper second ridge line is formed at the upper end edge of the rocker in the vehicle width direction, and a lower second ridge line is formed at the lower end edge of the rocker in the vehicle width direction,
The front pillar lower outer panel is continuously disposed on the upper first ridge line and continuously disposed on the upper third ridge line and continuously on the lower first ridge line. The vehicle skeleton structure according to claim 1, further comprising: a lower third ridge line continuously disposed on the lower second ridge line.