Vehicle front structure

Abstract

A vehicle front structure is provided with a battery unit (18) below a floor of a passenger compartment (22), and a battery-side extension member (50) is provided protruding on a lower surface of a front portion of a case of the battery unit (18). A member-side extension member (34, 34) is provided protruding at a position in a rear end edge of a suspension member (16) that opposes the battery-side extension member (50) in a vehicle front-rear direction.

Description

[0001] This application is a divisional application of the patent application with application number 2019105903784, application date 2019-07-02, and invention name "Vehicle front structure". TECHNICAL FIELD

[0002] The present application relates to a vehicle front structure. BACKGROUND

[0003] In an electric vehicle in which a rotary electric machine is provided as a drive source, a battery unit is mounted. For example, in Patent Literature 1, a battery unit is mounted under a floor (under the floor) of a vehicle cabin.

[0004] On the circuit, a power conversion unit is provided between the rotary electric machine and the battery unit, the power conversion unit including a DC / DC converter that performs step-up / step-down, and an inverter that performs AC / DC conversion. The rotary electric machine and the power conversion unit are mounted on an engine bulkhead in front of the vehicle.

[0005] In addition, front wheels are provided on both sides of the engine bulkhead, and a suspension member that is a frame member that suspends the front wheels is provided below the engine bulkhead. In the case where the battery unit is mounted under the floor, the suspension member is disposed in front of the battery unit.

[0006] PRIOR ART DOCUMENTS

[0007] PATENT LITERATURE

[0008] Patent Literature 1: International Publication No. 2014 / 034377 SUMMARY

[0009] However, at the time of a front collision of the vehicle (hereinafter, appropriately referred to as a frontal collision), the suspension member is pushed back by an obstacle. At this time, the suspension member can collide with the battery unit, causing damage to the battery unit. Therefore, an object of the present application is to provide a vehicle front structure that can avoid a collision between the suspension member and the battery unit at the time of a frontal collision.

[0010] The present application relates to a vehicle front structure. The vehicle front structure is provided with a battery unit disposed under a floor of a passenger compartment, and a suspension member disposed forward of the battery unit in a forward direction of the passenger compartment. A floor-side expansion member is provided on a lower surface of at least one of a lower portion of a front wall of the passenger compartment and a floor panel that constitute the floor, and protrudes forward of a front surface of the battery unit. The floor-side expansion member has a front end inclined surface that is located on a lower side. A battery-side expansion member is provided on a lower rear side of the front surface of the battery unit, and protrudes forward of a front end inclined surface that is located on a lower side. A member-side expansion member is provided on a position of a rear end edge of the suspension member that is opposed to the floor-side expansion member in a vehicle front-rear direction, and protrudes forward of a rear end inclined surface that is located on a rear side.

[0011] According to the above structure, when the suspension member retreats at the time of a frontal collision, the member-side expansion member first collides with the floor-side expansion member. Furthermore, when the suspension member further retreats, the member-side expansion member collides with the battery-side expansion member, and a rear surface of the suspension member moves toward the lower side, so that collision with the battery unit can be avoided.

[0012] Furthermore, in the above application, the lower end of the floor-side expansion member can be located on a lower side than the upper end of the battery-side expansion member.

[0013] According to the above structure, after the floor-side expansion member collides with the member-side expansion member, the suspension member enters toward the lower side and the rear side (toward the lower side obliquely) along the inclination of the opposed surface, and the floor-side expansion member is lifted. Thus, the inclined surface of the member-side expansion member is opposed to the inclined surface of the battery-side expansion member, and both slide so that collision of the suspension member with the battery unit can be prevented.

[0014] Furthermore, in the above application, the opposed surface of the member-side expansion member can be inclined more horizontally than the opposed surfaces of the pair of floor-side expansion members.

[0015] There is a case where, because of the support structure of the suspension member, the rear end of the suspension member inclines toward the lower side at the time of a frontal collision, that is, the opposed surface of the member-side expansion member retreats toward the lower side. Therefore, by previously inclining the opposed surface of the member-side expansion member more horizontally than the opposed surfaces of the floor-side expansion members, the opposed surface of the member-side expansion member can be made parallel to the opposed surfaces of the floor-side expansion members at the time of retreat of the suspension member.

[0016] Further, a vehicle front structure according to another aspect of the present application includes a battery unit disposed below a floor of a passenger compartment, and a suspension member disposed forward of the battery unit in a forward direction of the passenger compartment, a battery-side expansion member being provided protruding at a front portion of the battery unit, the battery-side expansion member having a front end inclined surface on a lower side thereof located rearward, and a member-side expansion member being provided protruding at a position of a rear end edge of the suspension member opposite to the battery-side expansion member in a vehicle longitudinal direction, the member-side expansion member having a rear end inclined surface on a lower side thereof located rearward.

[0017] According to the above structure, in a case where the suspension member moves rearward, the member-side expansion member collides with the battery-side expansion member, and the suspension member enters downward and rearward (obliquely downward) along the inclination of the opposite surface. Thus, collision of the suspension member with the battery unit can be prevented.

[0018] Further, in the above aspect, the battery unit can include a battery pack and a case housing the battery pack, the battery-side expansion member can be provided on a front lower surface of the case, and a peripheral portion of the battery-side expansion member in the case can be in a hollow state.

[0019] According to the above structure, in a case where the member-side expansion member collides with the battery-side expansion member, even if the case is deformed, since no component is mounted at the position, the component is not damaged and the impact can be absorbed.

[0020] According to the present application, collision of the suspension member with the battery unit at the time of a frontal collision can be avoided. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 A perspective view for illustrating a vehicle front structure according to the present embodiment.

[0022] Figure 2 An exploded perspective view for illustrating a vehicle front structure according to the present embodiment.

[0023] Figure 3 A perspective view for illustrating a rear portion of a vehicle front structure according to the present embodiment.

[0024] Figure 4 A Figure 3 A side sectional view of A-A of FIG.

[0025] Figure 5 A side view for explaining a movement condition of a suspension member at the time of a frontal collision.

[0026] Figure 6A side view (1 / 2) for explaining the state of the periphery of the member-side extension member, the floor-side extension member, and the battery-side extension member at the time of a head-on collision.

[0027] Figure 7 A side view (2 / 2) for explaining the state of the periphery of the member-side extension member, the floor-side extension member, and the battery-side extension member at the time of a head-on collision.

[0028] Figure 8 A view for showing a state in which the upper side of the battery unit is open.

[0029] Figure 9 A view for showing the connection of the suspension member with the vehicle body side using a bracket.

[0030] Figure 10 A side view for exemplifying a vehicle front structure according to another aspect of the embodiment. DETAILED DESCRIPTION

[0031] In Figure 1 , a perspective view of a vehicle front structure according to the embodiment is exemplified, and in Figure 2 , an exploded perspective view is exemplified.

[0032] Further, in Figures 1-10 , a vehicle front-rear direction is shown by an axis indicated by a reference symbol FR, a vehicle width direction (vehicle width direction) is shown by an axis indicated by a reference symbol RW, and an up-down direction is shown by an axis indicated by a reference symbol UP. The symbol FR is an abbreviation of Front, and the front-rear direction axis FR takes the front direction of the vehicle as the positive direction. The symbol RW is an abbreviation of Right Width, and the width direction axis RW takes the right width direction as the positive direction. Further, the height axis UP takes the upward direction as the positive direction.

[0033] As Figure 1 indicated, these FR axis, RW axis, and UP axis are orthogonal to each other. Hereinafter, in the description of the vehicle front structure according to the embodiment, the description is appropriately made with reference to these three axes. For example, the "front end" refers to the end portion of an arbitrary member on the positive direction side of the FR axis, and the "rear end" refers to the end portion of the arbitrary member on the negative direction side of the FR axis. The "width inner side" relatively refers to the inner side in the width direction of the vehicle along the RW axis, and the "width outer side" relatively refers to the outer side in the width direction of the vehicle along the RW axis. Further, the "width direction" refers to the vehicle width direction unless specifically indicated. Furthermore, the "upper side" relatively refers to the positive direction side of the UP axis, and the "lower side" relatively refers to the negative direction side of the UP axis.

[0034] Figure 1 , Figure 2The illustrated vehicle front structure is mounted on an electric vehicle in which a rotary electric machine 10 is provided as a drive source. The vehicle front structure includes front side members 12, 12, a high-voltage system assembly 14, a suspension member 16, and a battery unit 18.

[0035] The front side members 12, 12 are a pair of frame members provided on both widthwise sides (left and right) of the vehicle and each extend rearward from a front end of the vehicle. For example, the front side members 12, 12 extend from an engine bulkhead 20 at the front of the vehicle to a front portion of a passenger compartment 22 behind the engine bulkhead 20.

[0036] The high-voltage system assembly 14 and the suspension member 16 are mounted on the engine bulkhead 20. The high-voltage system assembly 14 is an assembly in which a plurality of high-voltage devices are assembled. The high-voltage system assembly 14 is configured by assembling the rotary electric machine 10, a charger 24, and a power conversion unit 26 on a bulkhead cross member 28.

[0037] The rotary electric machine 10 is a drive source of the vehicle and is assembled, for example, below the bulkhead cross member 28. The rotary electric machine 10 is configured by, for example, a permanent magnet synchronous motor.

[0038] The charger 24 and the power conversion unit 26 are assembled above the bulkhead cross member 28. The charger 24 is connected to, for example, a charging port not shown and is capable of being charged from a charging stand or the like outside the vehicle.

[0039] The power conversion unit 26 is connected between the rotary electric machine 10 and the battery unit 18 to perform power conversion. For example, the power conversion unit 26 is configured to include an inverter that performs AC / DC conversion of power and a DC / DC converter that performs step-up / down of power. The power conversion unit 26 houses the inverter and the DC / DC converter in a box having, for example, a rectangular parallelepiped shape. Further, a high-voltage cable 30 connected to the battery unit 18 is connected to a rear surface of the box. In addition, a high-voltage cable (not shown) connected to the rotary electric machine 10 is connected to a bottom surface of the box.

[0040] The bulkhead cross member 28 is a frame member fixed to the pair of front side members 12, 12. The bulkhead cross member 28 is, for example, a substantially L-shaped frame member and has an opening penetrating vertically formed at a center thereof. At the opening, a high-voltage cable (not shown) connecting the rotary electric machine 10 and the power conversion unit 26 is disposed.

[0041] The high voltage electric system assembly 14 is assembled with the rotary electric machine 10, the charger 24, and the electric power conversion unit 26 on the bulkhead cross member 28. In the assembly process of the vehicle, the high voltage electric system assembly 14 is lifted, for example, from below. Also, after the bulkhead cross member 28 is aligned with the upper and lower positions of the front side members 12, 12, the bulkhead cross member 28 is coupled to the front side members 12, 12 by means of a bracket not shown. By this assembly, as shown in Figure 1 the electric power conversion unit 26 is disposed at a position higher than the front side members 12.

[0042] The suspension member 16 is disposed below the high voltage electric system assembly 14 including the electric power conversion unit 26. Also, as shown in Figure 1 the suspension member 16 is disposed in front of the battery unit 18. That is, the suspension member 16 is in a positional relationship in which the height positions (the up and down direction positions) of the suspension member 16 and the battery unit 18 are aligned.

[0043] The suspension member 16 is a frame member that suspends a front wheel not shown. The suspension member 16 is in a substantially cross shape, and the width direction both sides of the front end portion and the width direction both sides of the rear end portion are in a shape that protrudes to the width direction outer sides. Support members 32A, 32B are coupled to the both sides of the protruding front end portion and the both sides of the protruding rear end portion. The support members 32A, 32B are also coupled to the bottom surface of the front side members 12. That is, the suspension member 16 is suspended and supported by the front side members 12 via the support members 32A, 32B.

[0044] Also, a pair of member side extensions 34, 34 (member side expansion members) are provided at the rear end of the suspension member 16. As shown in Figure 4 the member side extensions 34 are mounted to the rear surface upper end 16B from the upper surface rear end 16A of the suspension member 16, and are coupled at the rear end of the suspension member 16 in a state of being hooked in a hook shape.

[0045] For example, the member side extensions 34 are substantially box-shaped rigid members made of a metal material such as aluminum, and are in a closed cross-sectional structure in which the opening of the box is covered by the upper surface rear end 16A and the rear surface upper end 16B of the suspension member 16.

[0046] The member side extensions 34 can be coupled to the suspension member 16 by a coupling member such as a bolt and a nut, or can be joined to the suspension member 16 by welding or the like. Also, as a part of the suspension member 16, that is, the member side extensions 34 can be formed by machining the rear end so as to be raised upward.

[0047] The member side extensions 34 are provided protruding upward from the upper surface of the suspension member 16. Also, as shown inFigure 1 The member-side extensions 34, 34 are provided at positions in the rear end edge 16C of the suspension member 16 that are opposed to the floor-side extensions 36, 36 (floor-side expansion members) in the vehicle front-rear direction. Further, the suspension member 16 extends rearward on both sides thereof in the vehicle width direction to thereby constitute an extension portion 16D. Thus, the rear end edge 16C of the suspension member 16 provided with the member-side extensions 34, 34 is located on the front side compared to the extension portion 16D of the rear edge end on both sides in the vehicle width direction. Referring to Figure 4 The member-side extensions 34, 34 are provided on a ridge line that defines the boundary between the upper surface rear end 16A and the rear surface upper end 16B of the suspension member 16. Further, referring to Figure 3 The member-side extensions 34, 34 are provided along the vehicle width direction in a manner that separates the high-voltage cable 30.

[0048] Referring to Figure 4 On the member-side extensions 34, an opposed surface 34A is formed that is opposed to the floor-side extensions 36 in the vehicle front-rear direction. The opposed surface 34A is an inclined surface that inclines downward toward the rear of the vehicle. As will be described later, by providing the opposed surface 34A as an inclined surface, it is possible to cause the suspension member 16 to fall downward when a frontal collision occurs.

[0049] Further, in this example, the inclined angle θ1 of the opposed surface 34A of the member-side extensions 34 with respect to the horizontal plane is configured to be greater than the inclined angle θ2 of the opposed surface 36A of the floor-side extensions 36 with respect to the horizontal plane (θ1 > θ2). In other words, the opposed surface 34A of the member-side extensions 34 is inclined closer to the horizontal compared to the opposed surface 36A of the floor-side extensions 36. However, it is not necessarily the case that θ1 > θ2, and it can also be the case that θ1 = θ2, θ1 < θ2.

[0050] Thus, by providing the opposed surface 34A of the member-side extensions 34 as a structure that is laid down closer to the horizontal compared to the opposed surface 36A of the floor-side extensions 36, as will be described later, when the rear end of the suspension member 16 inclines downward and the opposed surface 34A of the member-side extensions 34 faces downward at the time of a frontal collision, the opposed surface 36A of the floor-side extensions 36 and the opposed surface 34A of the member-side extensions 34 are aligned parallel when viewed in side view.

[0051] Referring to Figure 1 The passenger compartment 22 is divided by a floor panel 38 and a passenger compartment front wall 40. The passenger compartment front wall 40 has an upper panel, i.e., a passenger compartment front wall upper portion 40A, and a lower panel, i.e., a passenger compartment front wall lower portion 40B.

[0052] The upper portion 40A of the front wall of the passenger compartment is disposed substantially vertically. The upper end of the lower portion 40B of the front wall of the passenger compartment is connected to the lower end of the upper portion 40A, and further extends from there in a curved shape in a side view, and is curved in a circular arc shape or an inclined shape from the vertical, and the rear end thereof is substantially horizontal, and is connected to the front end of the floor panel 38.

[0053] The lower portion 40B of the front wall of the passenger compartment functions as a so-called toe board on which the feet of an occupant seated on the front seat are placed. Due to such a function, the floor of the passenger compartment 22 is composed of the lower portion 40B of the front wall of the passenger compartment and the floor panel 38.

[0054] A floor tunnel 39 is formed at the widthwise center of the lower portion 40B of the front wall of the passenger compartment and the floor panel 38. In the case where an internal combustion engine is mounted on the vehicle, an exhaust pipe passes through this floor tunnel 39. On the other hand, in an electric vehicle in which no internal combustion engine is mounted, since no exhaust pipe is required, it is possible to arrange, for example, a battery ECU 42 that performs monitoring or control of a battery, and the like in the floor tunnel 39.

[0055] Further, with reference to Figure 3 , the floor tunnel 39 is reinforced by a reinforcing member called a tunnel reinforcement 44. The tunnel reinforcement 44 covers the floor tunnel 39, and extends to the floor areas (upper surfaces of the lower portion 40B of the front wall of the passenger compartment and the floor panel 38) on both sides of the floor tunnel 39 in the widthwise direction. As shown in Figure 3 , the floor side extenders 36, 36 are arranged below this extension portion. That is, the floor side extenders 36, 36 are arranged below the portion of at least one of the lower portion 40B of the front wall of the passenger compartment and the floor panel 38, on the upper surface of which the reinforcing member (tunnel reinforcement 44) is provided.

[0056] Returning to Figure 1 , a battery unit 18 is arranged below the floor of the passenger compartment, that is, below the floor panel 38. The battery unit 18 includes a box-shaped case 18B, and a battery group 18C arranged inside thereof. The battery group 18C includes a plurality of battery cells (single cells), which are constituted by, for example, lithium ion secondary batteries, nickel-hydrogen secondary batteries, or all-solid batteries. For example, a plurality of these battery cells are connected in parallel to constitute a battery pack, and a plurality of battery packs are connected in series to constitute the battery group 18C. Further, in this example, the battery ECU 42 is also arranged inside the case 18B (below the floor tunnel).

[0057] The battery unit 18 is arranged below the front end portion (refer to Figure 4A high-voltage cable 30 is connected at the width direction center of the high-voltage system assembly 14. The high-voltage cable 30 is disposed extending upward and forward from the front surface 18A of the battery unit 18, and is connected to the power conversion unit 26 of the high-voltage system assembly 14. For example Figure 1 As illustrated, the high-voltage cable 30 is disposed reaching obliquely upward toward the front when viewed from the side with the left side set as the front of the vehicle. Further, the high-voltage cable 30 supplies electric power from the battery group 18C to the rotating electric machine 10.

[0058] On the lower surface of the floor panel, which is a portion of the floor constituting the vehicle cabin 22, i.e., the lower portion 40B of the vehicle cabin front wall, a pair of floor side extenders 36, 36 (floor side expansion members) is provided. The floor side extenders 36, 36 are provided forward of the front surface 18A of the battery unit 18. For example, as illustrated in Figure 4 The floor side extender 36 is mounted on the lower surface of the lower portion 40B of the vehicle cabin front wall in such a manner that at least the opposing surface 36A opposing the member side extender 34 is made to be forward of the front surface 18A of the battery unit 18.

[0059] Further, although in the example of Figure 1 the floor side extenders 36, 36 are provided on the lower surface of the lower portion 40B of the vehicle cabin front wall, the present embodiment is not limited to such a manner. In general, it is only necessary to provide the floor side extenders 36, 36 on the lower surface of the floor of the vehicle cabin 22 that is forward of the front surface 18A of the battery unit 18. Specifically, it is only necessary to provide the floor side extenders 36, 36 on the lower surface of at least one of the lower portion 40B of the vehicle cabin front wall and the floor panel 38 that constitute the floor of the vehicle cabin 22, which is forward of the front surface 18A of the battery unit 18. For example, the floor side extenders 36, 36 can be provided on the lower surface of the floor panel 38, or the floor side extenders 36, 36 can be provided on the lower surfaces of both the lower portion 40B of the vehicle cabin front wall and the floor panel 38.

[0060] The floor side extender 36 is protrusively provided from the lower surface of the lower portion 40B of the vehicle cabin front wall toward the lower side in such a manner that the opposing surface 36A and the opposing surface 34A of the member side extender 34 oppose each other in the vehicle front-rear direction. For example, the floor side extenders 36, 36 are rigid members of substantially box shape constituted by a metal material such as aluminum, and are formed into a closed cross-sectional structure by covering the opening of the box with the lower portion 40B of the vehicle cabin front wall.

[0061] Referring to Figure 4The opposing surface 36A of the floor side extension 36 is inclined downward toward the rear of the vehicle. As described later, this inclined surface functions as a sliding surface for allowing the suspension member 16 to fall downward at the time of a frontal collision. The angle of inclination θ2 is determined in accordance with the amount by which the suspension member is to fall.

[0062] Alternatively, the angle of inclination θ2 of the opposing surface 36A of the floor side extension 36 with respect to the horizontal plane can be greater than the angle of inclination θ1 of the opposing surface 34A of the member side extension 34 with respect to the horizontal plane.

[0063] Referring to Figure 3 The floor side extensions 36, 36 are provided on the lower surface of the lower portion 40B of the front wall of the passenger compartment in a manner so as to straddle the high voltage cable 30. For example, the floor side extensions 36, 36 are provided at the boundary between the floor surface of the passenger compartment 22 and the floor tunnel 39.

[0064] <Structure of battery side extension>

[0065] Referring to Figure 4 In the obliquely lower rear of the floor side extensions 36, 36, a battery side extension 50, 50 (battery side extension member: only one is shown in the drawing) is provided in a manner so as to be mounted on the lower surface of the front portion of the case 18B of the battery unit 18. The front end of this battery side extension 50 is located forward of the front surface of the battery unit 18. Further, the battery side extension 50 has an inclined surface 50A on the front side corresponding to the opposing surface 34A of the member side extension 34. The member side extension 34 travels rearward, and causes the opposing surface 36A of the floor side extension 36 to slide toward the lower rear, and in the case of further moving rearward, opposes the member side extension 34 and guides it further toward the lower rear. Thus, it is possible to prevent the suspension member 16 and its accompanying components from colliding with the battery unit 18 and damaging the battery group 18C, and the like. Further, at this time, the battery side extension 50 moves toward the upper side rear.

[0066] The function of the battery side extension 50 is very similar to that of the floor side extension 36, and it is possible to use the same material and provide the same shape. Since the floor side extension 36 moves upward due to the collision of the member side extension 34 with the floor side extension 36, the battery side extension 50 is also lifted upward, but since the member side extension 34 moves toward the lower side, the angle of the inclined surface 50A can be substantially the same as θ2. Further, since the manner of deformation differs depending on the structure of the lower portion 40B of the front wall of the passenger compartment, and the like, it is only necessary to appropriately provide the most suitable shape. Further, since the mounting portion of the battery side extension 50 has a margin toward the rear, it is only necessary to provide a longer shape to the rear portion compared to the floor side extension 36.

[0067] Here, a figure showing the state in which the upper side of the battery unit 18 is opened is shown in Figure 8 Thus, the battery ECU 42 is disposed on the front side of the case 18B, and the battery group 18C is disposed on the rear side. In addition, the battery-side extension member 50 is attached to the lower surface side of both sides of the lower side of the case 18B. Further, the battery-side extension member 50 can also be attached to one side instead of both sides of the lower side of the case 18B. Moreover, no components are disposed on the floor surface of the case 18B on which the battery-side extension member 50 is attached, and thus this portion is hollow. That is, the components such as the battery ECU 42 are disposed at a position offset in the vehicle width direction. Therefore, even if the member-side extension member 34 collides with the battery-side extension member 50 and the battery-side extension member 50 moves upward, the influence on the components can be reduced. Further, the case 18B is generally a basket shape and is closed on the upper side.

[0068] <Structure of bracket>

[0069] Referring to Figure 2 At the rear end of both sides in the vehicle width direction of the suspension member 16, an elongated plate-shaped extension portion 16D extending rearward is formed. Further, one end of the bracket 60 is fixed to the extension portion 16D.

[0070] Figure 9 The combined state of the bracket 60 is shown. Thus, the front end of the bracket 60 is bolted on the basis of being welded to the extension portion 16D of the suspension member 16, and the rear end is bolted to the lower surface of the side face member 12. Therefore, by the bracket 60, it is also possible to suppress the movement of the suspension member 16 toward the battery unit 18. Further, as long as it is a member on the vehicle body side that has strength, the rear end of the bracket 60 can also be attached to other components instead of being attached to the side face member.

[0071] Here, there are cases in which a platform such as a chassis is shared by a vehicle with a high vehicle height and a vehicle with a low vehicle height. In this case, differences occur in the height difference between the vehicle body side and the suspension member 16. The bracket 60 is a member that connects the suspension member 16 and the vehicle body side, and by changing the shape of the bracket 60, adjustment for platform sharing by the vehicle with a high vehicle height and the vehicle with a low vehicle height can be performed.

[0072] <Behavior at the time of vehicle frontal collision>

[0073] Referring to Figures 4-7 The behavior at the time of vehicle frontal collision of the vehicle front structure according to the present embodiment will be described. As Figure 5As shown, when the vehicle front collides with a barrier 46, the front end of the front side member 12 will be bent by the barrier and will be deformed (bend). With this bending deformation, the support member 32A that supports the suspension member 16 on the front side member 12 will retreat. Along with this, the front end of the suspension member 16 will be lifted upward, and the rear end thereof will be tilted downward.

[0074] With the tilt of the rear end of the suspension member 16, the opposing surface 34A of the member-side extension 34 is set to face downward, and the opposing surface 34A and the opposing surface 36A of the floor-side extension 36 become parallel when viewed in side view. While maintaining this parallel state, the suspension member 16 further retreats, and as a result, as exemplified in FIG. 6, the opposing surface 34A of the member-side extension 34 collides with the opposing surface 36A of the floor-side extension 36. In addition, even if the rear end of the suspension member 16 is not tilted downward, as long as the suspension member 16 moves rearward and the opposing surface 34A of the member-side extension 34 collides with the opposing surface 36A of the floor-side extension 36, the same action condition will occur. Figure 6

[0075] At this collision, on the floor-side extension 36 that receives the collision of the member-side extension 34, such a load that is embedded into the passenger compartment is input. Here, as described above, the floor-side extension 36 is provided at the lower portion of the passage reinforcement 44 of the reinforcement member. In other words, the floor-side extension 36 is lined with the passage reinforcement 44. Therefore, the load of the floor-side extension 36 toward the passenger compartment 22 will be received and blocked by the passage reinforcement 44, and thus the entry of the floor-side extension 36 into the passenger compartment 22 is suppressed.

[0076] When the front collision further progresses, the opposing surface 34A of the member-side extension 34 and the opposing surface 36A of the floor-side extension 36 that are the inclined surfaces will guide the suspension member 16 downward. That is, the member-side extension 34 slides downward and rearward relative to the floor-side extension 36, and thus the suspension member 16 will fall downward and rearward. Therefore, the entry of the suspension member 16 into the passenger compartment 22 can be avoided.

[0077] When the suspension member 16 moves downward and rearward, as exemplified in FIG. 7, the opposing surface 34A of the member-side extension 34 collides with the opposing surface 36A of the floor-side extension 36. In addition, even if the rear end of the suspension member 16 is not tilted downward, as long as the suspension member 16 moves rearward and the opposing surface 34A of the member-side extension 34 collides with the opposing surface 36A of the floor-side extension 36, the same action condition will occur. Figure 7 ​As shown in the example, the facing surface 34A of the member-side extension 34 collides with the inclined surface 50A of the battery-side extension 50. The inclined surface 50A of the battery-side extension 50 becomes approximately aligned with the opposing surface 34A of the advancing member-side extension 34. As a result, the member-side extension 34 is guided downward and rearward by the inclined surface 50A, causing the suspension member 16 to move further downward and rearward. Although the extension portion 16D of the suspension member 16 and other components may deform significantly at this point, the further downward and rearward movement of the suspension member 16 prevents the suspension member 16 from colliding with the battery unit 18 and the high-voltage cable 30.

[0078] In this way, by arranging the battery side extension 50 on the lower surface of the front portion of the box 18B of the battery unit 18 below and behind the floor side extension 36, the component side extension 34 collides with the floor side extension 36 and the battery side extension 50 in sequence, thereby guiding the suspension component 16 downward and rearward, thereby avoiding intrusion into the vehicle cabin and collision with the battery unit 18 and the high-voltage cable 30.

[0079] <Other aspects of this embodiment>

[0080] Here, although both the floor-side extension 36 and the battery-side extension 50 are provided in the above-described embodiment, the floor-side extension 36 may be omitted.

[0081] That is, Figure 10 As shown, the inclined surface 50A of the battery-side extension 50 is positioned opposite the facing surface 34A of the member-side extension 34. Therefore, when the suspension member 16 moves rearward due to a head-on collision, the facing surface 34A of the member-side extension 34 is guided downward and rearward by the inclined surface 50A of the battery-side extension 50, thereby preventing the suspension member 16 from entering the vehicle cabin and colliding with the battery unit 18.

Claims

1. A vehicle front structure comprising: a battery unit disposed under the floor of the vehicle compartment; a suspension member provided forward of the vehicle cabin and in front of the battery unit; A floor side expansion member is provided protrudingly on the lower portion of the front wall of the vehicle compartment or the lower surface of the floor panel constituting the floor, in front of the front surface of the battery unit. The floor side expansion member has a front end inclined surface with its lower side located rearward. A battery-side expansion member is protrudingly provided on the front surface of the battery unit and at the rear lower portion of the floor-side expansion member. The battery-side expansion member has a front end inclined surface with its lower side located rearward. The rear end edge of the suspension member has a rear end inclined surface with the lower side located rearward, The front end slope of the floor-side expansion member faces the rear end slope of the suspension member in the vehicle front-rear direction and overlaps with the rear end slope of the suspension member in the vehicle front-rear direction. At least a portion of the front end slope of the battery-side expansion member faces the rear end slope of the suspension member in the vehicle front-rear direction. The lower end of the floor-side expansion member is located below the upper end of the front end slope of the battery-side expansion member.

2. The vehicle front structure according to claim 1, wherein: The area of ​​the surface facing the rear end inclined surface of the suspension member is larger on the front end inclined surface of the floor-side extension member than on the front end inclined surface of the battery-side extension member.

3. The vehicle front structure according to claim 1 or 2, wherein: The battery unit is connected to a high-voltage cable extending forward at the front end. The battery-side expansion member, the floor-side expansion member, and the rear end inclined surface of the suspension member are each provided with a pair. A pair of the floor-side expansion members is provided along the vehicle width direction so as to sandwich the high-voltage cable.

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