Vehicle underfloor structure

Abstract

The utility model provides a vehicle underfloor structure which can prevent a floor beam from being in contact with the upper surface of a battery module during side collision. A vehicle underfloor structure is provided with: a tunnel reinforcement extending in the front-rear direction of a vehicle; a floor cross member extending in the width direction of the vehicle from both side surfaces of the tunnel reinforcement; a plurality of battery modules arranged at the lower part of the floor cross member; a battery beam extending in the width direction between the plurality of battery modules; a support member disposed above the battery beam and having two protruding portions formed in the width direction, the protruding portions protruding upward; and a skeleton member configured to straddle the protrusion in the front-back direction.

Description

Technical Field

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

[0002] Conventionally, research has been underway to develop battery protection structures for vehicles such as battery-powered electric vehicles (BEVs) and plug-in hybrid electric vehicles (PHEVs).

[0003] Japanese Patent Application Laid-Open No. 2023-046945 describes a battery pack in which an intermediate frame supporting an upper case is disposed above an upper cross member disposed in each gap between adjacent battery modules. A damper serving as an impact-absorbing member is disposed on the upper surface of the intermediate frame.

[0004] In addition, a tunnel reinforcement extends in the vehicle's front-to-rear direction at the center of the vehicle's width. Furthermore, floor cross members extend from both sides of the tunnel reinforcement in the vehicle's width direction. The tunnel reinforcement and floor cross members are positioned on top of the battery.

[0005] In previous structures, in the event of a side collision, the floor cross member could rotate and deform starting from the tunnel reinforcement, causing the floor cross member to contact the upper surface of the battery (battery module).

[0006] Alternatively, a support member (middle bracket) may be arranged on the battery cross member (upper cross member) to support the floor cross member. However, since the support position varies depending on the size of the battery, the lower surface of the floor cross member may not be properly supported. Utility Model Content

[0007] The present disclosure has been made in view of the above circumstances, and an object thereof is to provide a vehicle underfloor structure that can prevent a floor cross member from contacting an upper surface of a battery module during a side collision.

[0008] The vehicle underfloor structure disclosed herein comprises: a tunnel reinforcement extending in the front-to-rear direction of the vehicle; a floor cross member extending from both side surfaces of the tunnel reinforcement in the width direction of the vehicle; a plurality of battery modules arranged below the floor cross member; a battery cross member extending in the width direction between the plurality of battery modules; a support member arranged above the battery cross member and having two protrusions protruding upward in the width direction; and a frame member arranged to span the protrusions in the front-to-rear direction.

[0009] According to the present disclosure, it is possible to realize a vehicle underfloor structure capable of preventing a floor cross member from contacting an upper surface of a battery module during a side collision.

[0010] In the above-described vehicle underfloor structure, the framework members are located immediately below both ends of the tunnel reinforcement in the width direction.

[0011] In the above-mentioned vehicle underfloor structure, the protrusion and the frame member are formed with recessed portions and convex portions that fit into each other. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic structural diagram of the vehicle underfloor structure involved in the embodiment.

[0013] Figure 2 For Figure 1 The cross-sectional view corresponding to line AA.

[0014] Figure 3 It is a partial enlarged view of the protrusion of the support component. DETAILED DESCRIPTION

[0015] The vehicle underfloor structure according to the embodiment of the present disclosure will be described with reference to the accompanying drawings. Components in the following embodiments include those that can be easily replaced by those skilled in the art or are substantially the same.

[0016] The vehicle underfloor structure according to the present embodiment is a structure for protecting a battery disposed under the floor of a vehicle such as a battery-equipped electric vehicle (BEV) or a plug-in hybrid electric vehicle (PHEV).

[0017] Figure 1 It is a schematic structural diagram of the vehicle underfloor structure involved in the embodiment. Figure 2 For Figure 1 The cross-sectional view corresponding to the AA line. Figure 1 and Figure 2 As shown, the vehicle underfloor structure 1 has a channel reinforcement 2, a floor cross member 3, a battery module 4 (see Figure 2 ), battery beam 5, support member 6, frame member 7, battery cover 8 (refer to Figure 2 ) and floor pan 9 (refer to Figure 2 ). In addition, Figure 1 Only the outlines of the tunnel reinforcement 2, floor cross member 3, and frame member 7 are shown, while the battery module 4, battery cover 8, and floor pan 9 are omitted. The following description assumes that the front-to-rear direction of the vehicle is direction D1, and the width direction of the vehicle is direction D2.

[0018] The tunnel reinforcement 2 has a trapezoidal cross section and extends in the center of the vehicle along the direction D1.

[0019] The floor cross member 3 has a trapezoidal cross section and extends in the direction D2 from both side surfaces of the tunnel reinforcement 2. A plurality of floor cross members 3 are provided at predetermined intervals along the direction D1.

[0020] The battery modules 4 are disposed below the floor cross member 3. The plurality of battery modules 4 are arranged along the direction D1 with the battery cross member 5 interposed therebetween.

[0021] The battery cross beam 5 extends along the direction D2 between the battery modules 4. A plurality of battery cross beams 5 are provided at predetermined intervals along the direction D1.

[0022] The support member 6 is disposed above the battery beam 5. The support member 6 has two protrusions 6a formed thereon, which protrude upward in the direction D2.

[0023] The frame member 7 is arranged across the protrusion 6a in the direction D1 and is located directly below both ends of the channel reinforcement 2 in the direction D2.

[0024] Figure 3 This is a partial enlarged view of the protrusion of the supporting component. Figure 3 As shown, a recessed portion 6b and a convex portion 7a that fit into each other are formed on the front end of the protrusion 6a and the frame member 7.

[0025] The battery cover 8 protects the battery module 4 .

[0026] The floor pan 9 supports the floor cross members 3 .

[0027] According to the vehicle underfloor structure 1 described above, when the floor cross member 3 rotates and deforms during a side collision, the frame member 7 receives the load from the floor cross member 3, thereby preventing the floor cross member 3 from contacting the upper surface of the battery module 4. In particular, the frame member 7 is located directly below both ends of the tunnel reinforcement 2 in direction D2, thereby preventing the end of the floor cross member 3 on the tunnel reinforcement 2 side from contacting the upper surface of the battery module 4.

[0028] Furthermore, according to the vehicle underfloor structure 1, since the frame member 7 extends in the direction D1, it is possible to prevent the floor cross member 3 from contacting the upper surface of the battery module 4 regardless of the position of the battery cross member 5. Therefore, the vehicle underfloor structure 1 can be used in vehicles equipped with any battery, regardless of the battery size.

[0029] Furthermore, according to the vehicle underfloor structure 1, since the recessed portion 6b and the convex portion 7a that fit together are formed on the front end of the protrusion 6a and the frame member 7, it is possible to prevent the frame member 7 from shifting due to the load from the floor cross member 3, thereby preventing the floor cross member 3 from contacting the upper surface of the battery module 4.

[0030] Those skilled in the art will readily derive further effects and variations. Therefore, the broader aspects of the present invention are not limited to the specific details and representative embodiments described above. Therefore, various modifications may be made without departing from the spirit or scope of the general utility model concept as defined by the appended claims and their equivalents.

Claims

1. A vehicle underfloor structure, characterized in that: have: a channel reinforcement member extending in a front-to-rear direction of the vehicle; a floor cross member extending from both sides of the tunnel reinforcement in the width direction of the vehicle; a plurality of battery modules disposed at a lower portion of the floor beam; a battery cross beam extending along the width direction between the plurality of battery modules; A supporting member is arranged above the battery beam and is formed with two protrusions protruding upward along the width direction; as well as The frame member is arranged to straddle the protrusion in the front-rear direction.

2. The vehicle underfloor structure according to claim 1, wherein: The frame member is located directly below both ends of the channel reinforcement in the width direction.

3. The vehicle underfloor structure according to claim 1, wherein: The protrusion and the frame member are formed with recessed portions and convex portions that fit into each other.

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