Vehicle underfloor structure

Abstract

The present invention provides a vehicle underfloor structure capable of preventing a floor cross member from coming into contact with the upper surface of a battery module in the event of a 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, in vehicles such as battery-equipped electric vehicles (BEVs) and plug-in hybrid electric vehicles (PHEVs), structures for protecting batteries have been studied.

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

[0004] In addition, the tunnel reinforcement extends in the front-rear direction of the vehicle at the center of the width direction of the vehicle. In addition, the floor cross member extends in the width direction of the vehicle from both sides of the tunnel reinforcement. The tunnel reinforcement and the floor cross member are arranged on top of the battery.

[0005] In the previous structure, in the event of a side collision, the floor cross member may 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 disposed 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. Summary of the invention

[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 involved in the present disclosure includes: a channel reinforcement extending in the front-to-rear direction of the vehicle; a floor beam extending from both side surfaces of the channel reinforcement in the width direction of the vehicle; a plurality of battery modules arranged at the lower portion of the floor beam; a battery beam extending in the width direction between the plurality of battery modules; a supporting component arranged above the battery beam and having two protrusions protruding upward in the width direction; and a frame component arranged to cross 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 directly 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 the recessed portion and the convex portion that fit together. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

[0015] The vehicle underfloor structure according to the embodiment of the present disclosure will be described with reference to the drawings. In addition, the constituent elements 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-mounted electric vehicle (BEV) or a plug-in hybrid electric vehicle (PHEV).

[0017] Figure 1 It is a schematic structural diagram of a vehicle underfloor structure involved in an 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 beam 3, and a battery module 4 (see Figure 2 )、Battery beam 5、support component 6、frame component 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, the floor cross member 3 and the frame member 7 are shown, and the battery module 4, the battery cover 8 and the floor pan 9 are omitted. In addition, the front-rear direction of the vehicle is set as direction D1, and the width direction of the vehicle is set as direction D2 for description below.

[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 in the direction D1.

[0020] The battery module 4 is disposed under 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 so as to protrude upward in the direction D2.

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

[0024] Figure 3 It 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 together are formed at 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 crossbeam 3 .

[0027] According to the vehicle underfloor structure 1 described above, when the floor cross member 3 is rotated and deformed 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 the 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] In addition, according to the vehicle underfloor structure 1, since the frame member 7 extends in the direction D1, the floor cross member 3 can be prevented 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 for vehicles equipped with any battery regardless of the size of the battery.

[0029] In addition, 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 being displaced by 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 can easily derive further effects and variations. Therefore, the broader aspects of the present invention are not limited to the specific details and representative embodiments as described above. Therefore, various changes may be made without departing from the spirit or scope of the general inventive concept 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-rear direction of the vehicle; a floor cross member extending from both sides of the channel reinforcement member in a width direction of the vehicle; a plurality of battery modules disposed at the 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, characterized in that: 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, characterized in that: The protrusion and the frame member are formed with recessed portions and convex portions that fit into each other.

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