WO2023085162A1 - Vehicle body substructure - Google Patents

Vehicle body substructure Download PDF

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Publication number
WO2023085162A1
WO2023085162A1 PCT/JP2022/040771 JP2022040771W WO2023085162A1 WO 2023085162 A1 WO2023085162 A1 WO 2023085162A1 JP 2022040771 W JP2022040771 W JP 2022040771W WO 2023085162 A1 WO2023085162 A1 WO 2023085162A1
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Prior art keywords
vehicle
width direction
vehicle width
panel
vehicle body
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PCT/JP2022/040771
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French (fr)
Japanese (ja)
Inventor
正敏 吉田
明男 杉本
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株式会社神戸製鋼所
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Publication of WO2023085162A1 publication Critical patent/WO2023085162A1/en

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60KARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K1/00Arrangement or mounting of electrical propulsion units
    • B60K1/04Arrangement or mounting of electrical propulsion units of the electric storage means for propulsion
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B62LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62DMOTOR VEHICLES; TRAILERS
    • B62D25/00Superstructure or monocoque structure sub-units; Parts or details thereof not otherwise provided for
    • B62D25/20Floors or bottom sub-units

Definitions

  • the present disclosure relates to a vehicle body lower structure.
  • Electric vehicles such as electric vehicles need to be equipped with large-capacity batteries in order to ensure a sufficient cruising range, but they also require a spacious cabin.
  • many electric vehicles have a large-capacity battery housed in a large battery case and mounted on the entire underfloor of the passenger compartment.
  • Patent Document 1 discloses a vehicle body lower structure in which a large battery case is arranged on the entire underfloor of the vehicle compartment, and a pair of side sills are arranged on both sides of the battery case in the vehicle width direction. Reinforcing members are arranged in the pair of side sills, and the reinforcing members receive a load in the vehicle width direction (side impact load) applied at the time of a vehicle side collision. A pair of side sills are joined to the floor cross member and the battery case, and the side impact load is also received by the floor cross member and the battery case.
  • Patent Document 1 a large battery case is placed on the entire underfloor of the passenger compartment, and the battery case receives a side impact load. Moreover, the structure for protecting the battery by providing a cross member extending in the vehicle width direction inside the battery case is complicated. Also, a gap is inevitably created between the pair of side sills outside the battery case and the cross member inside the battery case. Therefore, the generation timing of the reaction force against the side impact load is delayed, and high energy absorption efficiency cannot be ensured. Therefore, there is room for improvement in terms of load bearing performance as well.
  • An object of the present disclosure is to secure high battery protection performance and load bearing performance against side impact load with a simple structure in a vehicle body lower structure that stores a battery under the floor of the vehicle compartment like an electric vehicle.
  • the present disclosure includes a floor panel that forms a floor surface of a vehicle compartment, a pair of side sills that extend in the vehicle front-rear direction, a plurality of cross members that extend in the vehicle width direction below the floor panel and connect the pair of side sills, a side sill reinforcing member that reinforces each of the pair of side sills from the inside and overlaps with the plurality of cross members in the vehicle vertical direction; and a battery pack disposed thereon.
  • the side impact load can be received by the plurality of cross members. Furthermore, since the plurality of cross members overlap the side sill reinforcing member in the vertical direction of the vehicle, the side impact load received by the side sill reinforcing member can be transmitted to the plurality of cross members. Therefore, it is possible to ensure high load bearing performance against the side impact load. Moreover, since the space between the pair of side sills in the vehicle width direction is maintained by the plurality of cross members, damage to the battery pack arranged between the pair of side sills in the event of a vehicle side collision can be suppressed.
  • the battery pack includes battery cells and preferably has waterproof performance. In this way, a large-sized battery case that would be placed on the entire underfloor of the passenger compartment is not required, and high battery protection performance against side impact loads and load bearing performance can be ensured with a simple structure.
  • the battery pack may be arranged between the plurality of cross members in the vehicle front-rear direction and joined to the plurality of cross members.
  • the battery pack is arranged between the plurality of cross members.
  • a plurality of cross members are provided outside the battery pack. Therefore, the structure can be simplified as compared with the case where a plurality of cross members are provided inside the battery case. Also, since the battery pack is joined to the plurality of cross members, the battery pack can be easily installed.
  • the vehicle body lower structure may further include an undercover that covers the lower surface of the battery pack.
  • the undercover can exert a shock-absorbing function on the bottom surface of the vehicle and protect the battery pack from flying stones and the like from the road surface.
  • the undercover also functions as a rectifying plate, air resistance can be reduced.
  • the side sill reinforcing member may have a closed cross-sectional shape that defines a plurality of buffer spaces aligned in the vehicle width direction in a cross section perpendicular to the vehicle front-rear direction.
  • the plurality of buffer spaces are collapsed in order from the outside in the vehicle width direction, thereby exhibiting high energy absorption efficiency.
  • the side sill reinforcing member may be an extruded profile, and each of the pair of side sills includes an inner panel made of steel plate arranged on the inner side in the vehicle width direction and an outer panel made of steel plate arranged on the outer side in the vehicle width direction.
  • the inner panel may include an inner upper panel arranged on the upper side in the vehicle width direction and an inner lower panel arranged on the lower side in the vehicle width direction, the inner upper panel and the inner lower panel being:
  • the plurality of cross members may be spaced apart in the vertical direction of the vehicle so as to form openings, and the plurality of cross members are extruded members extending from the openings into the pair of side sills, and the side sill reinforcing members. may be joined.
  • Each of the pair of side sills may include a steel plate inner panel disposed on the vehicle width direction inner side and a steel plate outer panel disposed on the vehicle width direction outer side, and the plurality of cross members are made of steel plate. and may be joined to the inner panel.
  • Each of the pair of side sills may include an inner panel arranged inside in the vehicle width direction and an outer panel arranged outside in the vehicle width direction,
  • the side sill reinforcement may be configured as an extruded profile integral with the inner panel.
  • the floor panel may have a convex shape at the central portion in the vehicle width direction.
  • the convex shape of the floor panel ensures high load-bearing performance against a frontal collision of the vehicle. Normally, if a floor panel is formed in a convex shape, there is a risk that the load-bearing performance against side impact loads will decrease. Therefore, the above configuration functions effectively with its demerits suppressed.
  • a side view of an electric vehicle. 1 is a perspective view of a vehicle body lower structure according to a first embodiment; FIG. The top view of the vehicle body lower part structure which concerns on 1st Embodiment.
  • FIG. 4 is a cross-sectional view taken along line AA of FIG. 3; FIG. 4 is a cross-sectional view taken along line BB of FIG. 3;
  • electric vehicle 1 is a vehicle that runs by driving a motor (not shown) with electric power supplied from battery pack 10 .
  • the electric vehicle 1 may be an electric vehicle, a plug-in hybrid vehicle, or the like.
  • the type of vehicle is not particularly limited, and may be passenger cars, trucks, work vehicles, or other types of mobility. In the following description, the electric vehicle 1 is a passenger car type electric vehicle.
  • the electric vehicle 1 has a motor, high-voltage equipment, etc. (not shown) mounted on the front part 20 of the vehicle body.
  • the electric vehicle 1 has a compartment R in the vehicle body central portion 30 .
  • a plurality of battery packs 10 are stored in substantially the entire underfloor of the vehicle compartment R in a vehicle body lower structure 100 that constitutes the lower side of the vehicle compartment R.
  • each of the plurality of battery packs 10 has a waterproof case that seals the battery cells.
  • the front-rear direction of the electric vehicle 1 is indicated by the X direction
  • the up-down direction is indicated by the Z direction.
  • the width direction of the electric vehicle 1 is indicated by the Y direction in FIG. 2 and subsequent drawings.
  • the vehicle body lower structure 100 constitutes the lower frame of the vehicle body central portion 30 of the electric vehicle 1. As shown in FIG. In FIGS. 2-5, a portion of the underbody structure 100 is shown. Actually, the vehicle body lower structure 100 shown in FIGS. 2 to 5 has a shape symmetrical in the vehicle width direction with respect to the center line CL, and the same shape continues in the vehicle longitudinal direction beyond the breaking line BL. Note that FIG. 3 shows a state in which a floor panel 110, which will be described later, is removed.
  • the vehicle body lower structure 100 includes a floor panel 110 forming a floor surface of a vehicle interior R, a pair of side sills 120 extending in the vehicle front-rear direction, and extending in the vehicle width direction below the floor panel 110 to connect the pair of side sills 120 . and a plurality of cross members 130 .
  • floor panel 110 is made of steel plate.
  • the upper surface of the floor panel 110 is flat and constitutes the floor surface of the passenger compartment R.
  • Vehicle width direction end portions of the floor panel 110 are bent upward and welded to inner panels 121 of the pair of side sills 120, which will be described later.
  • the battery pack 10 is arranged below the floor panel 110 and between the pair of side sills 120 in the vehicle width direction.
  • a reinforcing member called a floor cross member is arranged on the floor panel.
  • a plurality of cross members 130 arranged under the floor panel 110 can ensure sufficient load bearing performance, so the floor cross members are omitted.
  • each of the pair of side sills 120 has a steel plate inner panel 121 arranged on the vehicle width direction inner side and a steel plate outer panel 122 arranged on the vehicle width direction outer side.
  • Inner panel 121 and outer panel 122 generally have a hat shape in cross section perpendicular to the vehicle front-rear direction.
  • the inner panel 121 and the outer panel 122 are welded together at both ends in the vertical direction of the vehicle to define a side sill space S1 inside.
  • a side sill reinforcing member 123 made of an aluminum alloy extruded shape is arranged in the side sill space S1.
  • the side sill reinforcing member 123 reinforces each of the pair of side sills 120 from the inside.
  • the side sill reinforcing member 123 contacts the inner panel 121 on the inner side in the vehicle width direction, and contacts the outer panel 122 on the outer side in the vehicle width direction.
  • the side sill reinforcing member 123 is joined to at least one of the inner panel 121 and the outer panel 122 by dissimilar material joining such as SPR (Self Piercing Rivet).
  • the side sill reinforcement 123 may be adjacent to the inner panel 121 or outer panel 122 without abutting them.
  • the side sill reinforcing member 123 may be joined to at least one of the inner panel 121 and the outer panel 122 via a bracket (not shown).
  • the side sill reinforcing member 123 has a closed cross-sectional shape defining a plurality of buffer spaces S11 to S13 arranged in the vehicle width direction in a cross section perpendicular to the vehicle front-rear direction.
  • Each of the plurality of buffer spaces S11-S13 may have any shape.
  • the side sill reinforcing member 123 is arranged so as to overlap with the plurality of cross members 130 in the vertical direction of the vehicle.
  • the side sill reinforcing member 123 and the plurality of cross members 130 overlap each other by 50% or more in size in the vertical direction of the vehicle.
  • the side sill reinforcing member 123 and the plurality of cross members 130 are arranged so as to substantially overlap (80% or more of each other) in the vertical direction of the vehicle.
  • the plurality of cross members 130 are made of steel plate and joined to the inner panel 121 .
  • the joining is, for example, MIG (Metal Inert Gas) welding.
  • the joining may be other joining means such as RSW (Resistance Spot Welding). This also applies to welding of subsequent members.
  • each of the plurality of cross members 130 has the same shape, and is a rectangle partitioned in the vehicle vertical direction in a cross section perpendicular to the vehicle width direction.
  • each of the plurality of cross members 130 may not have the same shape, and the cross-sectional shape may also be any shape.
  • the battery pack 10 is arranged between the plurality of cross members 130 in the longitudinal direction of the vehicle.
  • Battery pack 10 is joined to a plurality of cross members 130 .
  • the battery pack 10 has a flange portion 11 extending in the vehicle front-rear direction on its lower surface, and is joined to the lower surfaces of the plurality of cross members 130 at the flange portion 11 .
  • the joint may be a mechanical joint such as a bolt so that it can be detached during replacement.
  • the battery pack 10 is bolted from below for easy attachment and detachment.
  • a steel plate undercover 140 that covers the lower surface of the battery pack 10 is provided in the vehicle body lower structure 100 .
  • the undercover 140 is welded to the pair of side sills 120 so that a gap G is provided between the undercover 140 and the battery pack 10 in the vertical direction of the vehicle.
  • the undercover 140 is a sheet of plate material and is arranged over the entire vehicle body lower structure 100 .
  • the undercover 140 may be individually provided for each battery pack 10 .
  • the vehicle body lower structure 100 of this embodiment has the following advantages.
  • a plurality of cross members 130 joined to a pair of side sills 120 are arranged under the floor of the passenger compartment R (under the floor panel 110), so that the side impact load can be received by the plurality of cross members 130. Furthermore, since the plurality of cross members 130 overlap the side sill reinforcing member 123 in the vertical direction of the vehicle, the side impact load received by the side sill reinforcing member 123 can be transmitted to the plurality of cross members 130 . Therefore, it is possible to ensure high load bearing performance against the side impact load.
  • the battery pack 10 is arranged between a plurality of cross members 130 .
  • a plurality of cross members 130 are provided outside the battery pack 10 . Therefore, the structure can be simplified as compared with the case where a plurality of cross members 130 are provided inside the battery case. Moreover, since the battery pack 10 is joined to the plurality of cross members 130, the battery pack 10 can be easily installed.
  • the undercover 140 can exert the shock absorbing function of the bottom surface of the electric vehicle 1, and can protect the battery pack 10 against flying stones from the road surface.
  • the undercover 140 also functions as a rectifying plate, it is possible to reduce air resistance.
  • the plurality of buffer spaces S11 to S13 of the side sill reinforcing member 123 are crushed in order from the outside in the vehicle width direction, thereby exhibiting high energy absorption efficiency.
  • the pair of side sills 120 and the plurality of cross members 130 are both made of steel plate, so a specific design using a commonly used steel plate can be realized.
  • a vehicle body lower structure 100 of a second embodiment shown in FIGS. 6 and 7 differs from that of the first embodiment in the configuration of a plurality of cross members 130, a pair of side sills 120, and a side sill reinforcing member 123.
  • FIG. The configuration other than this is substantially the same as the first embodiment. Therefore, the description of the parts shown in the first embodiment may be omitted. 6 and 7 correspond to FIGS. 2 and 5 of the first embodiment, respectively.
  • the side sill reinforcing member 123 and the inner panel 121 are integrally configured as an aluminum alloy extruded shape.
  • the integrally formed side sill reinforcing member 123 and inner panel 121 have buffer spaces S11 to S13 as in the first embodiment.
  • the outer panel 122 is made of the same steel plate as in the first embodiment.
  • the inner panel 121 (side sill reinforcing member 123) and the outer panel 122 are joined by dissimilar metals using SPR or the like at both ends in the vertical direction of the vehicle.
  • the plurality of cross members 130 have the same shape as in the first embodiment, but are made of aluminum alloy extruded profiles.
  • the plurality of cross members 130 are welded to the inner panel 121 (side sill reinforcing member 123) at both end portions in the vehicle width direction.
  • the floor panel 110 and the undercover 140 may be made of the same steel plate as in the first embodiment, or may be made of an aluminum alloy plate material.
  • both the inner panel 121 (side sill reinforcing member 123) and the plurality of cross members 130 in the vehicle body lower part structure 100 are extruded members. Specific design using materials can be realized.
  • a vehicle body lower structure 100 of a third embodiment shown in FIGS. 8 and 9 differs from that of the first embodiment in the configuration of a plurality of cross members 130, a pair of side sills 120, and a side sill reinforcing member 123.
  • FIG. The configuration other than this is substantially the same as the first embodiment. Therefore, the description of the parts shown in the first embodiment may be omitted. 8 and 9 correspond to FIGS. 2 and 5 of the first embodiment, respectively.
  • the inner panel 121 includes an inner upper panel 121a made of a steel plate arranged on the vehicle width direction upper side, and an inner lower panel 121b arranged spaced downward from the inner upper panel 121a.
  • An opening 121c extending in the vehicle front-rear direction is defined by the inner upper panel 121a and the inner lower panel 121b.
  • the plurality of cross members 130 are extruded profiles made of aluminum alloy.
  • a plurality of cross members 130 extend into the pair of side sills 120 from the openings 121 c and are welded to the side sill reinforcing members 123 .
  • the floor panel 110 and the undercover 140 may be made of the same steel plate as in the first embodiment.
  • the floor panel 110 is welded to the inner upper panel 121a, and the undercover 140 is bolted to the inner lower panel 121b.
  • the floor panel 110 and the undercover 140 may be plate materials made of aluminum alloy.
  • the floor panel 110 is joined to the inner upper panel 121a by dissimilar metals, and the undercover 140 is joined to the inner lower panel 121b by dissimilar metals.
  • both the side sill reinforcing member 123 and the plurality of cross members 130 are extruded profiles, so a specific design using general-purpose extruded profiles can be realized. .
  • the floor panel 110 has a convex shape (convex portion 111) at the central portion in the vehicle width direction.
  • FIG. 10 shows only half of the convex portion 111 in the vehicle width direction, the convex portion 111 actually has a convex shape symmetrical in the vehicle width direction.
  • the convex shape of the floor panel 110 can ensure high load-bearing performance against a frontal collision of the vehicle. Normally, if the floor panel is formed in a convex shape, the load-bearing performance against the side impact load may decrease, but as described above, the multiple cross members 130 ensure high load-bearing performance against the side impact load. Therefore, the configuration of this modified example functions effectively with its demerit suppressed.
  • (Aspect 1) a floor panel forming the floor surface of the passenger compartment; a pair of side sills extending in the longitudinal direction of the vehicle; a plurality of cross members extending in the vehicle width direction below the floor panel and connecting the pair of side sills; a side sill reinforcing member that reinforces each of the pair of side sills from the inside and is arranged to overlap the plurality of cross members in the vertical direction of the vehicle; a battery pack disposed between the pair of side sills in the vehicle width direction below the floor panel.
  • (Aspect 2) The vehicle body lower structure according to aspect 1, wherein the battery pack is arranged between the plurality of cross members in the vehicle front-rear direction and is joined to the plurality of cross members.
  • the side sill reinforcement is an extruded profile
  • Each of the pair of side sills includes a steel plate inner panel disposed on the vehicle width direction inner side and a steel plate outer panel disposed on the vehicle width direction outer side
  • the inner panel includes an inner upper panel arranged on the upper side in the vehicle width direction and an inner lower panel arranged on the lower side in the vehicle width direction
  • the inner upper panel and the inner lower panel are spaced apart in the vertical direction of the vehicle so as to form an opening
  • the lower portion of the vehicle body according to any one of aspects 1 to 4, wherein the plurality of cross members are extruded members extending from the opening into the pair of side sills, and are joined to the side sill reinforcing members. structure.
  • Each of the pair of side sills includes a steel plate inner panel disposed on the vehicle width direction inner side and a steel plate outer panel disposed on the vehicle width direction outer side, The vehicle body lower part structure according to any one of modes 1 to 4, wherein the plurality of cross members are made of steel and are joined to the inner panel.
  • each of the pair of side sills includes an inner panel arranged on the inner side in the vehicle width direction and an outer panel arranged on the outer side in the vehicle width direction, The vehicle body lower part structure according to any one of modes 1 to 4, wherein the side sill reinforcing member is configured as an extruded profile integrally with the inner panel.

Abstract

A vehicle body substructure 100 comprises: a floor panel 110 that constitutes a floor surface of a vehicle cabin R; a pair of side sills 120 that extend in the front-back direction of the vehicle; a plurality of cross members 130 that extend in the vehicle width direction below the floor panel 110 so as to connect the pair of side sills 120; a side-sill reinforcement member 123 that reinforces the side sills 120 from the inner side and is disposed so as to overlap the cross members 130 in the vertical direction of the vehicle; and a battery pack that is disposed below the floor panel 110 and between the side sills 120 in the vehicle width direction.

Description

車体下部構造Underbody structure
 本開示は、車体下部構造に関する。 The present disclosure relates to a vehicle body lower structure.
 電気自動車などの電動車両は、十分な航続距離を確保するために大容量のバッテリーを搭載する必要がある一方で広い車室が求められている。これらの要求を両立するため、多くの電気自動車では大容量のバッテリーを大型のバッテリーケースに格納して車室床下全面に搭載している。 Electric vehicles such as electric vehicles need to be equipped with large-capacity batteries in order to ensure a sufficient cruising range, but they also require a spacious cabin. In order to satisfy both of these demands, many electric vehicles have a large-capacity battery housed in a large battery case and mounted on the entire underfloor of the passenger compartment.
 特許文献1では、車室床下全面に大型のバッテリーケースを配置し、バッテリーケースの車両幅方向両外側に一対のサイドシルを配置した車体下部構造が開示されている。一対のサイドシル内には補強材が配置されており、車両側面衝突時に付加される車両幅方向の荷重(側突荷重)は補強材で受けられる。また、一対のサイドシルはフロアクロスメンバおよびバッテリーケースと接合されており、側突荷重はフロアクロスメンバおよびバッテリーケースでも受けられる。 Patent Document 1 discloses a vehicle body lower structure in which a large battery case is arranged on the entire underfloor of the vehicle compartment, and a pair of side sills are arranged on both sides of the battery case in the vehicle width direction. Reinforcing members are arranged in the pair of side sills, and the reinforcing members receive a load in the vehicle width direction (side impact load) applied at the time of a vehicle side collision. A pair of side sills are joined to the floor cross member and the battery case, and the side impact load is also received by the floor cross member and the battery case.
特開2020-55473号公報JP 2020-55473 A
 特許文献1の構造では、車室床下全面に大型のバッテリーケースを配置し、バッテリーケースで側突荷重を受けるため、バッテリー保護性能の観点から好ましくなく、改善の余地がある。また、バッテリーケース内に車両幅方向に延びるクロスメンバを設けることでバッテリーを保護する構造は複雑である。また、バッテリーケース外の一対のサイドシルと、バッテリーケース内のクロスメンバとの間には必然的に隙間が生じる。従って、側突荷重に対する反力の発生タイミングが遅れ、高いエネルギー吸収効率を確保できない。よって、耐荷重性能の観点でも改善の余地がある。 In the structure of Patent Document 1, a large battery case is placed on the entire underfloor of the passenger compartment, and the battery case receives a side impact load. Moreover, the structure for protecting the battery by providing a cross member extending in the vehicle width direction inside the battery case is complicated. Also, a gap is inevitably created between the pair of side sills outside the battery case and the cross member inside the battery case. Therefore, the generation timing of the reaction force against the side impact load is delayed, and high energy absorption efficiency cannot be ensured. Therefore, there is room for improvement in terms of load bearing performance as well.
 本開示は、電動車両のように車室床下にバッテリーを格納する車体下部構造において、単純な構造で側突荷重に対する高いバッテリー保護性能および耐荷重性能を確保することを課題とする。 An object of the present disclosure is to secure high battery protection performance and load bearing performance against side impact load with a simple structure in a vehicle body lower structure that stores a battery under the floor of the vehicle compartment like an electric vehicle.
 本開示は、車室床面を構成するフロアパネルと、車両前後方向に延びる一対のサイドシルと、前記フロアパネルの下方で車両幅方向に延びて前記一対のサイドシルを接続する複数のクロスメンバと、前記一対のサイドシルのそれぞれを内側から補強し、車両上下方向において前記複数のクロスメンバと重複して配置されたサイドシル補強材と、前記フロアパネルの下方で前記一対のサイドシルの車両幅方向の間に配置されたバッテリーパックとを備える、車体下部構造を提供する。 The present disclosure includes a floor panel that forms a floor surface of a vehicle compartment, a pair of side sills that extend in the vehicle front-rear direction, a plurality of cross members that extend in the vehicle width direction below the floor panel and connect the pair of side sills, a side sill reinforcing member that reinforces each of the pair of side sills from the inside and overlaps with the plurality of cross members in the vehicle vertical direction; and a battery pack disposed thereon.
 この構成によれば、車室床下(フロアパネルの下)に一対のサイドシルと接合される複数のクロスメンバが配置されているため、複数のクロスメンバによって側突荷重を受けることができる。さらに、複数のクロスメンバは、サイドシル補強材と車両上下方向において重複して配置されているため、サイドシル補強材で受けた側突荷重を複数のクロスメンバに伝達できる。従って、側突荷重に対する高い耐荷重性能を確保できる。また、一対のサイドシルの車両幅方向の間隔は複数のクロスメンバによって維持されるため、一対のサイドシルの間に配置されたバッテリーパックが車両側面衝突時に損傷することを抑制できる。従って、高いバッテリー保護性能を確保できる。ここで、バッテリーパックとは、バッテリーのセルを含み、好ましくは防水性能を有する。このようにして、車室床下の全面に配置されるような大型のバッテリーケースを不要にし、単純な構造で側突荷重に対する高いバッテリー保護性能および耐荷重性能を確保できる。 According to this configuration, since a plurality of cross members joined to a pair of side sills are arranged under the floor of the passenger compartment (under the floor panel), the side impact load can be received by the plurality of cross members. Furthermore, since the plurality of cross members overlap the side sill reinforcing member in the vertical direction of the vehicle, the side impact load received by the side sill reinforcing member can be transmitted to the plurality of cross members. Therefore, it is possible to ensure high load bearing performance against the side impact load. Moreover, since the space between the pair of side sills in the vehicle width direction is maintained by the plurality of cross members, damage to the battery pack arranged between the pair of side sills in the event of a vehicle side collision can be suppressed. Therefore, high battery protection performance can be ensured. Here, the battery pack includes battery cells and preferably has waterproof performance. In this way, a large-sized battery case that would be placed on the entire underfloor of the passenger compartment is not required, and high battery protection performance against side impact loads and load bearing performance can be ensured with a simple structure.
 前記バッテリーパックは、車両前後方向において前記複数のクロスメンバの間に配置され、前記複数のクロスメンバに接合されていてもよい。 The battery pack may be arranged between the plurality of cross members in the vehicle front-rear direction and joined to the plurality of cross members.
 この構成によれば、バッテリーパックは複数のクロスメンバの間に配置されている。換言すれば、バッテリーパック外に複数のクロスメンバを設けている。従って、バッテリーケース内に複数のクロスメンバを設ける場合と比べて構造を単純化できる。また、複数のクロスメンバにバッテリーパックが接合されているため、バッテリーパックを簡易に設置できる。 According to this configuration, the battery pack is arranged between the plurality of cross members. In other words, a plurality of cross members are provided outside the battery pack. Therefore, the structure can be simplified as compared with the case where a plurality of cross members are provided inside the battery case. Also, since the battery pack is joined to the plurality of cross members, the battery pack can be easily installed.
 前記車体下部構造は、前記バッテリーパックの下面を覆うアンダカバーをさらに備えてもよい。 The vehicle body lower structure may further include an undercover that covers the lower surface of the battery pack.
 この構成によれば、アンダカバーによって車両底面の衝撃緩衝機能を発揮でき、路面からの飛び石などに対してバッテリーパックを保護できる。また、アンダカバーは整流板としても機能するため、空気抵抗も低減できる。 With this configuration, the undercover can exert a shock-absorbing function on the bottom surface of the vehicle and protect the battery pack from flying stones and the like from the road surface. In addition, since the undercover also functions as a rectifying plate, air resistance can be reduced.
 前記サイドシル補強材は、車両前後方向に垂直な断面において、車両幅方向に並ぶ複数の緩衝空間を画定する閉断面形状を有してもよい。 The side sill reinforcing member may have a closed cross-sectional shape that defines a plurality of buffer spaces aligned in the vehicle width direction in a cross section perpendicular to the vehicle front-rear direction.
 この構成によれば、側突荷重を受けた際に複数の緩衝空間が車両幅方向外側から順に潰れることによって高いエネルギー吸収効率を発揮できる。 According to this configuration, when a side impact load is received, the plurality of buffer spaces are collapsed in order from the outside in the vehicle width direction, thereby exhibiting high energy absorption efficiency.
 前記サイドシル補強材は、押出形材であってもよく、前記一対のサイドシルのそれぞれは、車両幅方向内側に配置された鋼板製のインナパネルと、車両幅方向外側に配置された鋼板製のアウタパネルとを含んでもよく、前記インナパネルは、車両幅方向上側に配置されたインナアッパパネルと、車両幅方向下側に配置されたインナロアパネルとを含んでもよく、前記インナアッパパネルおよびインナロアパネルは、開口部を形成するように車両上下方向に離間して配置されてもよく、前記複数のクロスメンバは、前記開口部から前記一対のサイドシル内にまで延びる押出形材であり、前記サイドシル補強材と接合されてもよい。 The side sill reinforcing member may be an extruded profile, and each of the pair of side sills includes an inner panel made of steel plate arranged on the inner side in the vehicle width direction and an outer panel made of steel plate arranged on the outer side in the vehicle width direction. The inner panel may include an inner upper panel arranged on the upper side in the vehicle width direction and an inner lower panel arranged on the lower side in the vehicle width direction, the inner upper panel and the inner lower panel being: The plurality of cross members may be spaced apart in the vertical direction of the vehicle so as to form openings, and the plurality of cross members are extruded members extending from the openings into the pair of side sills, and the side sill reinforcing members. may be joined.
 前記一対のサイドシルのそれぞれは、車両幅方向内側に配置された鋼板製のインナパネルと、車両幅方向外側に配置された鋼板製のアウタパネルとを含んでもよく、前記複数のクロスメンバは、鋼板製であり、前記インナパネルと接合されてもよい。 Each of the pair of side sills may include a steel plate inner panel disposed on the vehicle width direction inner side and a steel plate outer panel disposed on the vehicle width direction outer side, and the plurality of cross members are made of steel plate. and may be joined to the inner panel.
 前記一対のサイドシルのそれぞれは、車両幅方向内側に配置されたインナパネルと、車両幅方向外側に配置されたアウタパネルとを含んでもよく、
 前記サイドシル補強材は、前記インナパネルと一体的に押出形材として構成されてもよい。
Each of the pair of side sills may include an inner panel arranged inside in the vehicle width direction and an outer panel arranged outside in the vehicle width direction,
The side sill reinforcement may be configured as an extruded profile integral with the inner panel.
 これらの構成によれば、車体下部構造において汎用的に使用される鋼板ないしアルミニウム合金などの押出形材を使用した具体的な設計を実現できる。 With these configurations, it is possible to realize a specific design using extruded members such as steel plates or aluminum alloys that are commonly used in the lower body structure.
 前記フロアパネルは、車両幅方向の中央部において凸形状を有してもよい。 The floor panel may have a convex shape at the central portion in the vehicle width direction.
 この構成によれば、フロアパネルの凸形状によって、車両前方衝突に対する高い耐荷重性能を確保できる。通常、フロアパネルに凸形状を形成すると、側突荷重に対する耐荷重性能が低下するおそれがあるが、前述のようにして複数のクロスメンバによって側突荷重に対しては高い耐荷重性能が確保されているため、上記構成はデメリットが抑制されて有効に機能する。 According to this configuration, the convex shape of the floor panel ensures high load-bearing performance against a frontal collision of the vehicle. Normally, if a floor panel is formed in a convex shape, there is a risk that the load-bearing performance against side impact loads will decrease. Therefore, the above configuration functions effectively with its demerits suppressed.
 本開示によれば、電動車両のように車室床下にバッテリーを格納する車体下部構造において、単純な構造で側突荷重に対する高いバッテリー保護性能および耐荷重性能を確保できる。 According to the present disclosure, it is possible to ensure high battery protection performance and load bearing performance against side impact load with a simple structure in a vehicle body lower structure that stores a battery under the floor of the passenger compartment like an electric vehicle.
電動車両の側面図。A side view of an electric vehicle. 第1実施形態に係る車体下部構造の斜視図。1 is a perspective view of a vehicle body lower structure according to a first embodiment; FIG. 第1実施形態に係る車体下部構造の平面図。The top view of the vehicle body lower part structure which concerns on 1st Embodiment. 図3のA-A線に沿った断面図。FIG. 4 is a cross-sectional view taken along line AA of FIG. 3; 図3のB-B線に沿った断面図。FIG. 4 is a cross-sectional view taken along line BB of FIG. 3; 第2実施形態に係る車体下部構造の斜視図。The perspective view of the vehicle body lower part structure which concerns on 2nd Embodiment. 第2実施形態に係る車体下部構造の断面図。Sectional drawing of the vehicle body lower part structure which concerns on 2nd Embodiment. 第3実施形態に係る車体下部構造の斜視図。The perspective view of the vehicle body lower part structure which concerns on 3rd Embodiment. 第3実施形態に係る車体下部構造の断面図。Sectional drawing of the vehicle body lower part structure which concerns on 3rd Embodiment. 第3実施形態の変形例に係る車体下部構造を示す斜視図。The perspective view which shows the vehicle body lower part structure which concerns on the modification of 3rd Embodiment.
 以下、添付図面を参照して本発明の実施形態を説明する。 Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
(第1実施形態)
 図1を参照して、電動車両1は、バッテリーパック10から供給される電力によって不図示のモータを駆動させて走行する車両である。例えば、電動車両1は、電気自動車またはプラグインハイブリッド車等であり得る。車両の種類については、特に限定されず、乗用車、トラック、作業車、またはその他のモビリティ等であり得る。以下では、電動車両1として乗用車タイプの電気自動車の場合を例に挙げて説明する。
(First embodiment)
Referring to FIG. 1, electric vehicle 1 is a vehicle that runs by driving a motor (not shown) with electric power supplied from battery pack 10 . For example, the electric vehicle 1 may be an electric vehicle, a plug-in hybrid vehicle, or the like. The type of vehicle is not particularly limited, and may be passenger cars, trucks, work vehicles, or other types of mobility. In the following description, the electric vehicle 1 is a passenger car type electric vehicle.
 電動車両1は、車体前部20に不図示のモータや高電圧機器等を搭載している。また、電動車両1は、車体中央部30に車室Rを有している。電動車両1は、車室Rの下側を構成する車体下部構造100において、車室Rの床下の概ね全面に複数のバッテリーパック10を格納している。好ましくは、複数のバッテリーパック10のそれぞれは、バッテリーセルを密閉した防水ケースを有している。なお、図1中、電動車両1の前後方向をX方向で示し、上下方向をZ方向で示している。以降の図でも同表記とし、図2以降で電動車両1の幅方向をY方向で示す。 The electric vehicle 1 has a motor, high-voltage equipment, etc. (not shown) mounted on the front part 20 of the vehicle body. In addition, the electric vehicle 1 has a compartment R in the vehicle body central portion 30 . In the electric vehicle 1, a plurality of battery packs 10 are stored in substantially the entire underfloor of the vehicle compartment R in a vehicle body lower structure 100 that constitutes the lower side of the vehicle compartment R. As shown in FIG. Preferably, each of the plurality of battery packs 10 has a waterproof case that seals the battery cells. In FIG. 1, the front-rear direction of the electric vehicle 1 is indicated by the X direction, and the up-down direction is indicated by the Z direction. The same notation is used in subsequent figures, and the width direction of the electric vehicle 1 is indicated by the Y direction in FIG. 2 and subsequent drawings.
 図2~5を参照して、車体下部構造100は、電動車両1の車体中央部30の下部の骨格を構成する。図2~5では、車体下部構造100の一部が示されている。実際には、図2~5に示す車体下部構造100は、中心線CLについて車両幅方向に対称な形状を有し、車両前後方向にも破断線BLを超えて同様の形状が続いている。なお、図3では、後述するフロアパネル110が取り外された状態が示されている。 2 to 5, the vehicle body lower structure 100 constitutes the lower frame of the vehicle body central portion 30 of the electric vehicle 1. As shown in FIG. In FIGS. 2-5, a portion of the underbody structure 100 is shown. Actually, the vehicle body lower structure 100 shown in FIGS. 2 to 5 has a shape symmetrical in the vehicle width direction with respect to the center line CL, and the same shape continues in the vehicle longitudinal direction beyond the breaking line BL. Note that FIG. 3 shows a state in which a floor panel 110, which will be described later, is removed.
 車体下部構造100は、車室Rの床面を構成するフロアパネル110と、車両前後方向に延びる一対のサイドシル120と、フロアパネル110の下方で車両幅方向に延びて一対のサイドシル120を接続する複数のクロスメンバ130とを備える。 The vehicle body lower structure 100 includes a floor panel 110 forming a floor surface of a vehicle interior R, a pair of side sills 120 extending in the vehicle front-rear direction, and extending in the vehicle width direction below the floor panel 110 to connect the pair of side sills 120 . and a plurality of cross members 130 .
 図2を参照して、本実施形態では、フロアパネル110は、鋼板製である。フロアパネル110の上面は、平坦であり、車室Rの床面を構成する。フロアパネル110の車両幅方向端部は、上方へ向かって折り曲げられ、一対のサイドシル120の後述するインナパネル121と溶接されている。バッテリーパック10は、フロアパネル110の下方で一対のサイドシル120の車両幅方向の間に配置されている。なお、本実施形態とは異なるが、一般の車体下部構造では、フロアパネルの上にはフロアクロスメンバと称される強度部材が配置される。しかし、本実施形態ではフロアパネル110の下に配置された複数のクロスメンバ130によって十分な耐荷重性能を確保できるため、当該フロアクロスメンバは省略されている。 Referring to FIG. 2, in this embodiment, floor panel 110 is made of steel plate. The upper surface of the floor panel 110 is flat and constitutes the floor surface of the passenger compartment R. As shown in FIG. Vehicle width direction end portions of the floor panel 110 are bent upward and welded to inner panels 121 of the pair of side sills 120, which will be described later. The battery pack 10 is arranged below the floor panel 110 and between the pair of side sills 120 in the vehicle width direction. Although different from the present embodiment, in a general vehicle body lower structure, a reinforcing member called a floor cross member is arranged on the floor panel. However, in this embodiment, a plurality of cross members 130 arranged under the floor panel 110 can ensure sufficient load bearing performance, so the floor cross members are omitted.
 図2,5を参照して、一対のサイドシル120のそれぞれは、車両幅方向内側に配置された鋼板製のインナパネル121と、車両幅方向外側に配置された鋼板製のアウタパネル122とを有している。インナパネル121およびアウタパネル122は、車両前後方向に垂直な断面において概ねハット形を有している。インナパネル121およびアウタパネル122は、車両上下方向の両端部を互いに溶接され、内部にサイドシル空間S1を画定している。 2 and 5, each of the pair of side sills 120 has a steel plate inner panel 121 arranged on the vehicle width direction inner side and a steel plate outer panel 122 arranged on the vehicle width direction outer side. ing. Inner panel 121 and outer panel 122 generally have a hat shape in cross section perpendicular to the vehicle front-rear direction. The inner panel 121 and the outer panel 122 are welded together at both ends in the vertical direction of the vehicle to define a side sill space S1 inside.
 本実施形態では、サイドシル空間S1には、アルミニウム合金製の押出形材からなるサイドシル補強材123が配置されている。サイドシル補強材123は、一対のサイドシル120のそれぞれを内側から補強している。サイドシル補強材123は、車両幅方向の内側においてインナパネル121と当接し、車両幅方向の外側においてアウタパネル122と当接している。サイドシル補強材123は、SPR(Self Piercing Rivet)などの異材接合によってインナパネル121およびアウタパネル122の少なくとも一方と接合されている。代替的には、サイドシル補強材123は、インナパネル121またはアウタパネル122と当接せずに近接していてもよい。このとき、サイドシル補強材123は、図示しないブラケットを介してインナパネル121およびアウタパネル122の少なくとも一方と接合されてもよい。 In this embodiment, a side sill reinforcing member 123 made of an aluminum alloy extruded shape is arranged in the side sill space S1. The side sill reinforcing member 123 reinforces each of the pair of side sills 120 from the inside. The side sill reinforcing member 123 contacts the inner panel 121 on the inner side in the vehicle width direction, and contacts the outer panel 122 on the outer side in the vehicle width direction. The side sill reinforcing member 123 is joined to at least one of the inner panel 121 and the outer panel 122 by dissimilar material joining such as SPR (Self Piercing Rivet). Alternatively, the side sill reinforcement 123 may be adjacent to the inner panel 121 or outer panel 122 without abutting them. At this time, the side sill reinforcing member 123 may be joined to at least one of the inner panel 121 and the outer panel 122 via a bracket (not shown).
 本実施形態では、サイドシル補強材123は、車両前後方向に垂直な断面において、車両幅方向に並ぶ複数の緩衝空間S11~S13を画定する閉断面形状を有している。複数の緩衝空間S11~S13のそれぞれは、任意の形状であり得る。 In this embodiment, the side sill reinforcing member 123 has a closed cross-sectional shape defining a plurality of buffer spaces S11 to S13 arranged in the vehicle width direction in a cross section perpendicular to the vehicle front-rear direction. Each of the plurality of buffer spaces S11-S13 may have any shape.
 また、サイドシル補強材123は、車両上下方向において複数のクロスメンバ130と重複して配置されている。好ましくは、サイドシル補強材123および複数のクロスメンバ130は、車両上下方向の大きさにおいて互いに50%以上重複している。本実施形態では、図5に示すように、サイドシル補強材123および複数のクロスメンバ130は、車両上下方向において概ね全体(互いに80%以上)が重複して配置されている。 In addition, the side sill reinforcing member 123 is arranged so as to overlap with the plurality of cross members 130 in the vertical direction of the vehicle. Preferably, the side sill reinforcing member 123 and the plurality of cross members 130 overlap each other by 50% or more in size in the vertical direction of the vehicle. In the present embodiment, as shown in FIG. 5, the side sill reinforcing member 123 and the plurality of cross members 130 are arranged so as to substantially overlap (80% or more of each other) in the vertical direction of the vehicle.
 本実施形態では、複数のクロスメンバ130は、鋼板製であり、インナパネル121と接合されている。当該接合は、例えばMIG(Metal Inert Gas)溶接である。代替的には、当該接合は、RSW(Resistance Spot Welding)など他の接合手段であってもよい。これは以降の各部材の溶接に関しても同様である。また、複数のクロスメンバ130のそれぞれは、すべて同じ形状であり、車両幅方向に垂直な断面において車両上下方向に仕切られた矩形である。ただし、複数のクロスメンバ130のそれぞれは、同じ形状でなくてもよく、断面形状も任意の形状であり得る。 In this embodiment, the plurality of cross members 130 are made of steel plate and joined to the inner panel 121 . The joining is, for example, MIG (Metal Inert Gas) welding. Alternatively, the joining may be other joining means such as RSW (Resistance Spot Welding). This also applies to welding of subsequent members. Further, each of the plurality of cross members 130 has the same shape, and is a rectangle partitioned in the vehicle vertical direction in a cross section perpendicular to the vehicle width direction. However, each of the plurality of cross members 130 may not have the same shape, and the cross-sectional shape may also be any shape.
 図2,4を参照して、車両前後方向において複数のクロスメンバ130の間には、バッテリーパック10が配置されている。バッテリーパック10は、複数のクロスメンバ130に接合されている。図示の例では、バッテリーパック10は下面において車両前後方向に延出したフランジ部11を有し、フランジ部11において複数のクロスメンバ130の下面に接合されている。当該接合は、交換時に着脱可能なように,例えばボルトなどの機械的接合であり得る。好ましくは、バッテリーパック10は容易に着脱できるように下側からボルト接合されている。 2 and 4, the battery pack 10 is arranged between the plurality of cross members 130 in the longitudinal direction of the vehicle. Battery pack 10 is joined to a plurality of cross members 130 . In the illustrated example, the battery pack 10 has a flange portion 11 extending in the vehicle front-rear direction on its lower surface, and is joined to the lower surfaces of the plurality of cross members 130 at the flange portion 11 . The joint may be a mechanical joint such as a bolt so that it can be detached during replacement. Preferably, the battery pack 10 is bolted from below for easy attachment and detachment.
 本実施形態では、車体下部構造100において、バッテリーパック10の下面を覆う鋼板製のアンダカバー140が設けられている。アンダカバー140は、アンダカバー140とバッテリーパック10との間には車両上下方向に隙間Gが設けられるように一対のサイドシル120に溶接されている。アンダカバー140は、1枚の板材であり、車体下部構造100の全体にわたって配置されている。代替的には、アンダカバー140は、個々のバッテリーパック10に対して個別に設けられてもよい。 In this embodiment, a steel plate undercover 140 that covers the lower surface of the battery pack 10 is provided in the vehicle body lower structure 100 . The undercover 140 is welded to the pair of side sills 120 so that a gap G is provided between the undercover 140 and the battery pack 10 in the vertical direction of the vehicle. The undercover 140 is a sheet of plate material and is arranged over the entire vehicle body lower structure 100 . Alternatively, the undercover 140 may be individually provided for each battery pack 10 .
 本実施形態の車体下部構造100は、以下の利点を有している。 The vehicle body lower structure 100 of this embodiment has the following advantages.
 車室Rの床下(フロアパネル110の下)に一対のサイドシル120と接合される複数のクロスメンバ130が配置されているため、複数のクロスメンバ130によって側突荷重を受けることができる。さらに、複数のクロスメンバ130は、サイドシル補強材123と車両上下方向において重複して配置されているため、サイドシル補強材123で受けた側突荷重を複数のクロスメンバ130に伝達できる。従って、側突荷重に対する高い耐荷重性能を確保できる。また、一対のサイドシル120の車両幅方向の間隔は複数のクロスメンバ130によって維持されるため、一対のサイドシル120の間に配置されたバッテリーパック10が車両側面衝突時に損傷することを抑制できる。従って、高いバッテリー保護性能を確保できる。このようにして、車室Rの床下の全面に配置されるような大型のバッテリーケースを不要にし、単純な構造で側突荷重に対する高いバッテリー保護性能および耐荷重性能を確保できる。 A plurality of cross members 130 joined to a pair of side sills 120 are arranged under the floor of the passenger compartment R (under the floor panel 110), so that the side impact load can be received by the plurality of cross members 130. Furthermore, since the plurality of cross members 130 overlap the side sill reinforcing member 123 in the vertical direction of the vehicle, the side impact load received by the side sill reinforcing member 123 can be transmitted to the plurality of cross members 130 . Therefore, it is possible to ensure high load bearing performance against the side impact load. In addition, since the space between the pair of side sills 120 in the vehicle width direction is maintained by the plurality of cross members 130, damage to the battery pack 10 arranged between the pair of side sills 120 in the event of a vehicle side collision can be suppressed. Therefore, high battery protection performance can be ensured. In this way, a large-sized battery case that would be placed on the entire underfloor of the passenger compartment R is not required, and high battery protection performance against side impact loads and load bearing performance can be ensured with a simple structure.
 また、バッテリーパック10は複数のクロスメンバ130の間に配置されている。換言すれば、バッテリーパック10外に複数のクロスメンバ130を設けている。従って、バッテリーケース内に複数のクロスメンバ130を設ける場合と比べて構造を単純化できる。また、複数のクロスメンバ130にバッテリーパック10が接合されているため、バッテリーパック10を簡易に設置できる。 Also, the battery pack 10 is arranged between a plurality of cross members 130 . In other words, a plurality of cross members 130 are provided outside the battery pack 10 . Therefore, the structure can be simplified as compared with the case where a plurality of cross members 130 are provided inside the battery case. Moreover, since the battery pack 10 is joined to the plurality of cross members 130, the battery pack 10 can be easily installed.
 また、アンダカバー140によって電動車両1の底面の衝撃緩衝機能を発揮でき、路面からの飛び石などに対してバッテリーパック10を保護できる。また、アンダカバー140は整流板としても機能するため、空気抵抗も低減できる。 In addition, the undercover 140 can exert the shock absorbing function of the bottom surface of the electric vehicle 1, and can protect the battery pack 10 against flying stones from the road surface. In addition, since the undercover 140 also functions as a rectifying plate, it is possible to reduce air resistance.
 また、側突荷重を受けた際にサイドシル補強材123の複数の緩衝空間S11~S13が車両幅方向外側から順に潰れることによって高いエネルギー吸収効率を発揮できる。 In addition, when receiving a side impact load, the plurality of buffer spaces S11 to S13 of the side sill reinforcing member 123 are crushed in order from the outside in the vehicle width direction, thereby exhibiting high energy absorption efficiency.
 車体下部構造100において、一対のサイドシル120および複数のクロスメンバ130がともに鋼板製であるため、汎用的に使用される鋼板を使用した具体的な設計を実現できる。 In the vehicle body lower structure 100, the pair of side sills 120 and the plurality of cross members 130 are both made of steel plate, so a specific design using a commonly used steel plate can be realized.
(第2実施形態)
 図6,7に示す第2実施形態の車体下部構造100は、複数のクロスメンバ130と、一対のサイドシル120と、サイドシル補強材123とに関する構成が第1実施形態と異なる。これに関する構成以外は、第1実施形態と実質的に同じである。従って、第1実施形態にて示した部分については説明を省略する場合がある。なお、図6,7は、第1実施形態の図2,5にそれぞれ対応している。
(Second embodiment)
A vehicle body lower structure 100 of a second embodiment shown in FIGS. 6 and 7 differs from that of the first embodiment in the configuration of a plurality of cross members 130, a pair of side sills 120, and a side sill reinforcing member 123. FIG. The configuration other than this is substantially the same as the first embodiment. Therefore, the description of the parts shown in the first embodiment may be omitted. 6 and 7 correspond to FIGS. 2 and 5 of the first embodiment, respectively.
 本実施形態では、サイドシル補強材123およびインナパネル121が一体的にアルミニウム合金製の押出形材として構成されている。一体的に形成されたサイドシル補強材123およびインナパネル121は、第1実施形態と同様に緩衝空間S11~S13を有している。アウタパネル122は、第1実施形態と同じ鋼板製である。インナパネル121(サイドシル補強材123)およびアウタパネル122は、車両上下方向の両端部においてSPRなどを用いて異種金属接合されている。 In this embodiment, the side sill reinforcing member 123 and the inner panel 121 are integrally configured as an aluminum alloy extruded shape. The integrally formed side sill reinforcing member 123 and inner panel 121 have buffer spaces S11 to S13 as in the first embodiment. The outer panel 122 is made of the same steel plate as in the first embodiment. The inner panel 121 (side sill reinforcing member 123) and the outer panel 122 are joined by dissimilar metals using SPR or the like at both ends in the vertical direction of the vehicle.
 本実施形態では、複数のクロスメンバ130は、第1実施形態と形状は同じであるが、アルミニウム合金製の押出形材からなる。複数のクロスメンバ130は、車両幅方向の両端部においてインナパネル121(サイドシル補強材123)と溶接されている。 In this embodiment, the plurality of cross members 130 have the same shape as in the first embodiment, but are made of aluminum alloy extruded profiles. The plurality of cross members 130 are welded to the inner panel 121 (side sill reinforcing member 123) at both end portions in the vehicle width direction.
 フロアパネル110およびアンダカバー140は、第1実施形態と同じ鋼板製であってもよいし、アルミニウム合金製の板材であってもよい。 The floor panel 110 and the undercover 140 may be made of the same steel plate as in the first embodiment, or may be made of an aluminum alloy plate material.
 本実施形態の車体下部構造100によれば、車体下部構造100において、インナパネル121(サイドシル補強材123)および複数のクロスメンバ130がともに押出形材であるため、汎用的に使用される押出形材を使用した具体的な設計を実現できる。 According to the vehicle body lower part structure 100 of the present embodiment, both the inner panel 121 (side sill reinforcing member 123) and the plurality of cross members 130 in the vehicle body lower part structure 100 are extruded members. Specific design using materials can be realized.
(第3実施形態)
 図8,9に示す第3実施形態の車体下部構造100は、複数のクロスメンバ130と、一対のサイドシル120と、サイドシル補強材123とに関する構成が第1実施形態と異なる。これに関する構成以外は、第1実施形態と実質的に同じである。従って、第1実施形態にて示した部分については説明を省略する場合がある。なお、図8,9は、第1実施形態の図2,5にそれぞれ対応している。
(Third Embodiment)
A vehicle body lower structure 100 of a third embodiment shown in FIGS. 8 and 9 differs from that of the first embodiment in the configuration of a plurality of cross members 130, a pair of side sills 120, and a side sill reinforcing member 123. FIG. The configuration other than this is substantially the same as the first embodiment. Therefore, the description of the parts shown in the first embodiment may be omitted. 8 and 9 correspond to FIGS. 2 and 5 of the first embodiment, respectively.
 本実施形態では、インナパネル121は、車両幅方向上側に配置された鋼板製のインナアッパパネル121aと、インナアッパパネル121aから下方へ離間して配置されたインナロアパネル121bとを含んでいる。インナアッパパネル121aとインナロアパネル121bとによって、車両前後方向に延びる開口部121cが画定されている。 In this embodiment, the inner panel 121 includes an inner upper panel 121a made of a steel plate arranged on the vehicle width direction upper side, and an inner lower panel 121b arranged spaced downward from the inner upper panel 121a. An opening 121c extending in the vehicle front-rear direction is defined by the inner upper panel 121a and the inner lower panel 121b.
 本実施形態では、複数のクロスメンバ130は、アルミニウム合金製の押出形材である。複数のクロスメンバ130は、開口部121cから一対のサイドシル120内にまで延び、サイドシル補強材123と溶接されている。 In this embodiment, the plurality of cross members 130 are extruded profiles made of aluminum alloy. A plurality of cross members 130 extend into the pair of side sills 120 from the openings 121 c and are welded to the side sill reinforcing members 123 .
 フロアパネル110およびアンダカバー140は、第1実施形態と同じ鋼板製であってもよい。この場合、フロアパネル110はインナアッパパネル121aと溶接され、アンダカバー140はインナロアパネル121bとボルト接合されている。代替的には、フロアパネル110およびアンダカバー140は、アルミニウム合金製の板材であってもよい。この場合、フロアパネル110はインナアッパパネル121aと異種金属接合され、アンダカバー140はインナロアパネル121bと異種金属接合される。 The floor panel 110 and the undercover 140 may be made of the same steel plate as in the first embodiment. In this case, the floor panel 110 is welded to the inner upper panel 121a, and the undercover 140 is bolted to the inner lower panel 121b. Alternatively, the floor panel 110 and the undercover 140 may be plate materials made of aluminum alloy. In this case, the floor panel 110 is joined to the inner upper panel 121a by dissimilar metals, and the undercover 140 is joined to the inner lower panel 121b by dissimilar metals.
 本実施形態の車体下部構造100によれば、サイドシル補強材123および複数のクロスメンバ130がともに押出形材であるため、汎用的に使用される押出形材を使用した具体的な設計を実現できる。 According to the vehicle body lower part structure 100 of the present embodiment, both the side sill reinforcing member 123 and the plurality of cross members 130 are extruded profiles, so a specific design using general-purpose extruded profiles can be realized. .
 また、図10に示す第3実施形態の変形例の車体下部構造100では、フロアパネル110は、車両幅方向の中央部において凸形状(凸部111)を有している。図10では、凸部111の車両幅方向における半分のみが示されているが、実際には凸部111は車両幅方向に対称的な凸形状を有している。 Further, in the vehicle body lower portion structure 100 of the modification of the third embodiment shown in FIG. 10, the floor panel 110 has a convex shape (convex portion 111) at the central portion in the vehicle width direction. Although FIG. 10 shows only half of the convex portion 111 in the vehicle width direction, the convex portion 111 actually has a convex shape symmetrical in the vehicle width direction.
 本変形例の車体下部構造100によれば、フロアパネル110の凸形状によって、車両前方衝突に対する高い耐荷重性能を確保できる。通常、フロアパネルに凸形状を形成すると、側突荷重に対する耐荷重性能が低下するおそれがあるが、前述のようにして複数のクロスメンバ130によって側突荷重に対しては高い耐荷重性能が確保されているため、本変形例の構成はデメリットが抑制されて有効に機能する。 According to the vehicle body lower part structure 100 of this modified example, the convex shape of the floor panel 110 can ensure high load-bearing performance against a frontal collision of the vehicle. Normally, if the floor panel is formed in a convex shape, the load-bearing performance against the side impact load may decrease, but as described above, the multiple cross members 130 ensure high load-bearing performance against the side impact load. Therefore, the configuration of this modified example functions effectively with its demerit suppressed.
 以上より、本発明の具体的な実施形態および変形例について説明したが、本発明は上記形態に限定されるものではなく、この発明の範囲内で種々変更して実施することができる。例えば、個々の実施形態および変形例の内容を適宜組み合わせたものを、この発明の一実施形態としてもよい。 Although the specific embodiments and modifications of the present invention have been described above, the present invention is not limited to the above embodiments, and can be implemented with various modifications within the scope of the present invention. For example, an embodiment of the present invention may be an appropriate combination of the contents of individual embodiments and modifications.
 本開示の内容をまとめて以下の通り記載する。
(態様1)
 車室床面を構成するフロアパネルと、
 車両前後方向に延びる一対のサイドシルと、
 前記フロアパネルの下方で車両幅方向に延びて前記一対のサイドシルを接続する複数のクロスメンバと、
 前記一対のサイドシルのそれぞれを内側から補強し、車両上下方向において前記複数のクロスメンバと重複して配置されたサイドシル補強材と、
 前記フロアパネルの下方で前記一対のサイドシルの車両幅方向の間に配置されたバッテリーパックと
 を備える、車体下部構造。
(態様2)
 前記バッテリーパックは、車両前後方向において前記複数のクロスメンバの間に配置され、前記複数のクロスメンバに接合されている、態様1に記載の車体下部構造。
(態様3)
 前記バッテリーパックの下面を覆うアンダカバーをさらに備える、態様1または態様2に記載の車体下部構造。
(態様4)
 前記サイドシル補強材は、車両前後方向に垂直な断面において、車両幅方向に並ぶ複数の緩衝空間を画定する閉断面形状を有している、態様1から態様3のいずれか1態様に記載の車体下部構造。
(態様5)
 前記サイドシル補強材は、押出形材であり、
 前記一対のサイドシルのそれぞれは、車両幅方向内側に配置された鋼板製のインナパネルと、車両幅方向外側に配置された鋼板製のアウタパネルとを含み、
 前記インナパネルは、車両幅方向上側に配置されたインナアッパパネルと、車両幅方向下側に配置されたインナロアパネルとを含み、
 前記インナアッパパネルおよびインナロアパネルは、開口部を形成するように車両上下方向に離間して配置され、
 前記複数のクロスメンバは、前記開口部から前記一対のサイドシル内にまで延びる押出形材であり、前記サイドシル補強材と接合されている、態様1から態様4のいずれか1態様に記載の車体下部構造。
(態様6)
 前記一対のサイドシルのそれぞれは、車両幅方向内側に配置された鋼板製のインナパネルと、車両幅方向外側に配置された鋼板製のアウタパネルとを含み、
 前記複数のクロスメンバは、鋼板製であり、前記インナパネルと接合されている、態様1から態様4のいずれか1態様に記載の車体下部構造。
(態様7)
 前記一対のサイドシルのそれぞれは、車両幅方向内側に配置されたインナパネルと、車両幅方向外側に配置されたアウタパネルとを含み、
 前記サイドシル補強材は、前記インナパネルと一体的に押出形材として構成されている、態様1から態様4のいずれか1態様に記載の車体下部構造。
(態様8)
 前記フロアパネルは、車両幅方向の中央部において凸形状を有している、態様1から態様7のいずれか1態様に記載の車体下部構造。
The contents of the present disclosure are summarized as follows.
(Aspect 1)
a floor panel forming the floor surface of the passenger compartment;
a pair of side sills extending in the longitudinal direction of the vehicle;
a plurality of cross members extending in the vehicle width direction below the floor panel and connecting the pair of side sills;
a side sill reinforcing member that reinforces each of the pair of side sills from the inside and is arranged to overlap the plurality of cross members in the vertical direction of the vehicle;
a battery pack disposed between the pair of side sills in the vehicle width direction below the floor panel.
(Aspect 2)
The vehicle body lower structure according to aspect 1, wherein the battery pack is arranged between the plurality of cross members in the vehicle front-rear direction and is joined to the plurality of cross members.
(Aspect 3)
The vehicle body lower structure according to aspect 1 or aspect 2, further comprising an undercover that covers the lower surface of the battery pack.
(Aspect 4)
The vehicle body according to any one of modes 1 to 3, wherein the side sill reinforcing member has a closed cross-sectional shape defining a plurality of buffer spaces arranged in the vehicle width direction in a cross section perpendicular to the vehicle front-rear direction. undercarriage.
(Aspect 5)
The side sill reinforcement is an extruded profile,
Each of the pair of side sills includes a steel plate inner panel disposed on the vehicle width direction inner side and a steel plate outer panel disposed on the vehicle width direction outer side,
The inner panel includes an inner upper panel arranged on the upper side in the vehicle width direction and an inner lower panel arranged on the lower side in the vehicle width direction,
The inner upper panel and the inner lower panel are spaced apart in the vertical direction of the vehicle so as to form an opening,
The lower portion of the vehicle body according to any one of aspects 1 to 4, wherein the plurality of cross members are extruded members extending from the opening into the pair of side sills, and are joined to the side sill reinforcing members. structure.
(Aspect 6)
Each of the pair of side sills includes a steel plate inner panel disposed on the vehicle width direction inner side and a steel plate outer panel disposed on the vehicle width direction outer side,
The vehicle body lower part structure according to any one of modes 1 to 4, wherein the plurality of cross members are made of steel and are joined to the inner panel.
(Aspect 7)
each of the pair of side sills includes an inner panel arranged on the inner side in the vehicle width direction and an outer panel arranged on the outer side in the vehicle width direction,
The vehicle body lower part structure according to any one of modes 1 to 4, wherein the side sill reinforcing member is configured as an extruded profile integrally with the inner panel.
(Aspect 8)
The vehicle body lower portion structure according to any one of modes 1 to 7, wherein the floor panel has a convex shape at a central portion in the vehicle width direction.
 本出願は、出願日が2021年11月15日である日本国特許出願、特願第2021-185718号を基礎出願とする優先権主張を伴う。特願第2021-185718号は参照することにより本明細書に取り込まれる。 This application is accompanied by a priority claim based on a Japanese patent application, Japanese Patent Application No. 2021-185718, whose filing date is November 15, 2021. Japanese Patent Application No. 2021-185718 is incorporated herein by reference.
  1 電動車両
  10 バッテリーパック
  11 フランジ部
  20 車体前部
  30 車体中央部
  100 車体下部構造
  110 フロアパネル
  111 凸部
  120 サイドシル
  121 インナパネル
  121a インナアッパパネル
  121b インナロアパネル
  121c 開口部
  122 アウタパネル
  123 サイドシル補強材
  130 クロスメンバ
  140 アンダカバー
  R 車室
  S1 サイドシル空間
  S11~S13 緩衝空間
  G 隙間
Reference Signs List 1 electric vehicle 10 battery pack 11 flange portion 20 vehicle front portion 30 vehicle center portion 100 vehicle body lower structure 110 floor panel 111 convex portion 120 side sill 121 inner panel 121a inner upper panel 121b inner lower panel 121c opening 122 outer panel 123 side sill reinforcement 130 cloth Member 140 Undercover R Vehicle interior S1 Side sill space S11-S13 Buffer space G Gap

Claims (15)

  1.  車室床面を構成するフロアパネルと、
     車両前後方向に延びる一対のサイドシルと、
     前記フロアパネルの下方で車両幅方向に延びて前記一対のサイドシルを接続する複数のクロスメンバと、
     前記一対のサイドシルのそれぞれを内側から補強し、車両上下方向において前記複数のクロスメンバと重複して配置されたサイドシル補強材と、
     前記フロアパネルの下方で前記一対のサイドシルの車両幅方向の間に配置されたバッテリーパックと
     を備える、車体下部構造。
    a floor panel forming the floor surface of the passenger compartment;
    a pair of side sills extending in the longitudinal direction of the vehicle;
    a plurality of cross members extending in the vehicle width direction below the floor panel and connecting the pair of side sills;
    a side sill reinforcing member that reinforces each of the pair of side sills from the inside and is arranged to overlap the plurality of cross members in the vertical direction of the vehicle;
    a battery pack disposed between the pair of side sills in the vehicle width direction below the floor panel.
  2.  前記バッテリーパックは、車両前後方向において前記複数のクロスメンバの間に配置され、前記複数のクロスメンバに接合されている、請求項1に記載の車体下部構造。 The vehicle body lower structure according to claim 1, wherein the battery pack is arranged between the plurality of cross members in the vehicle front-rear direction and is joined to the plurality of cross members.
  3.  前記バッテリーパックの下面を覆うアンダカバーをさらに備える、請求項1に記載の車体下部構造。 The vehicle body lower structure according to claim 1, further comprising an undercover that covers the lower surface of the battery pack.
  4.  前記バッテリーパックの下面を覆うアンダカバーをさらに備える、請求項2に記載の車体下部構造。 The vehicle body lower structure according to claim 2, further comprising an undercover that covers the lower surface of the battery pack.
  5.  前記サイドシル補強材は、車両前後方向に垂直な断面において、車両幅方向に並ぶ複数の緩衝空間を画定する閉断面形状を有している、請求項1に記載の車体下部構造。 The vehicle body lower structure according to claim 1, wherein the side sill reinforcing member has a closed cross-sectional shape defining a plurality of buffer spaces arranged in the vehicle width direction in a cross section perpendicular to the vehicle front-rear direction.
  6.  前記サイドシル補強材は、車両前後方向に垂直な断面において、車両幅方向に並ぶ複数の緩衝空間を画定する閉断面形状を有している、請求項2に記載の車体下部構造。 The vehicle body lower part structure according to claim 2, wherein the side sill reinforcing member has a closed cross-sectional shape defining a plurality of buffer spaces arranged in the vehicle width direction in a cross section perpendicular to the vehicle front-rear direction.
  7.  前記サイドシル補強材は、車両前後方向に垂直な断面において、車両幅方向に並ぶ複数の緩衝空間を画定する閉断面形状を有している、請求項3に記載の車体下部構造。 The vehicle body lower part structure according to claim 3, wherein the side sill reinforcing member has a closed cross-sectional shape defining a plurality of buffer spaces arranged in the vehicle width direction in a cross section perpendicular to the vehicle front-rear direction.
  8.  前記サイドシル補強材は、車両前後方向に垂直な断面において、車両幅方向に並ぶ複数の緩衝空間を画定する閉断面形状を有している、請求項4に記載の車体下部構造。 The vehicle body lower part structure according to claim 4, wherein the side sill reinforcing member has a closed cross-sectional shape defining a plurality of buffer spaces arranged in the vehicle width direction in a cross section perpendicular to the vehicle front-rear direction.
  9.  前記サイドシル補強材は、押出形材であり、
     前記一対のサイドシルのそれぞれは、車両幅方向内側に配置された鋼板製のインナパネルと、車両幅方向外側に配置された鋼板製のアウタパネルとを含み、
     前記インナパネルは、車両幅方向上側に配置されたインナアッパパネルと、車両幅方向下側に配置されたインナロアパネルとを含み、
     前記インナアッパパネルおよびインナロアパネルは、開口部を形成するように車両上下方向に離間して配置され、
     前記複数のクロスメンバは、前記開口部から前記一対のサイドシル内にまで延びる押出形材であり、前記サイドシル補強材と接合されている、請求項1から請求項8のいずれか1項に記載の車体下部構造。
    The side sill reinforcement is an extruded profile,
    Each of the pair of side sills includes a steel plate inner panel disposed on the vehicle width direction inner side and a steel plate outer panel disposed on the vehicle width direction outer side,
    The inner panel includes an inner upper panel arranged on the upper side in the vehicle width direction and an inner lower panel arranged on the lower side in the vehicle width direction,
    The inner upper panel and the inner lower panel are spaced apart in the vertical direction of the vehicle so as to form an opening,
    9. A cross member as claimed in any one of the preceding claims, wherein the plurality of cross members are extruded profiles extending from the opening into the pair of side sills and joined with the side sill stiffeners. Underbody structure.
  10.  前記一対のサイドシルのそれぞれは、車両幅方向内側に配置された鋼板製のインナパネルと、車両幅方向外側に配置された鋼板製のアウタパネルとを含み、
     前記複数のクロスメンバは、鋼板製であり、前記インナパネルと接合されている、請求項1から請求項8のいずれか1項に記載の車体下部構造。
    Each of the pair of side sills includes a steel plate inner panel disposed on the vehicle width direction inner side and a steel plate outer panel disposed on the vehicle width direction outer side,
    The vehicle body lower structure according to any one of claims 1 to 8, wherein the plurality of cross members are made of steel and are joined to the inner panel.
  11.  前記一対のサイドシルのそれぞれは、車両幅方向内側に配置されたインナパネルと、車両幅方向外側に配置されたアウタパネルとを含み、
     前記サイドシル補強材は、前記インナパネルと一体的に押出形材として構成されている、請求項1から請求項8のいずれか1項に記載の車体下部構造。
    each of the pair of side sills includes an inner panel arranged on the inner side in the vehicle width direction and an outer panel arranged on the outer side in the vehicle width direction,
    The vehicle body lower part structure according to any one of claims 1 to 8, wherein the side sill reinforcing member is configured as an extruded profile integrally with the inner panel.
  12.  前記フロアパネルは、車両幅方向の中央部において凸形状を有している、請求項1から請求項8のいずれか1項に記載の車体下部構造。 The vehicle body lower structure according to any one of claims 1 to 8, wherein the floor panel has a convex shape at the central portion in the vehicle width direction.
  13.  前記フロアパネルは、車両幅方向の中央部において凸形状を有している、請求項9に記載の車体下部構造。 The vehicle body lower part structure according to claim 9, wherein the floor panel has a convex shape at the central portion in the vehicle width direction.
  14.  前記フロアパネルは、車両幅方向の中央部において凸形状を有している、請求項10に記載の車体下部構造。 The vehicle body lower part structure according to claim 10, wherein the floor panel has a convex shape at the central portion in the vehicle width direction.
  15.  前記フロアパネルは、車両幅方向の中央部において凸形状を有している、請求項11に記載の車体下部構造。 The vehicle body lower part structure according to claim 11, wherein the floor panel has a convex shape at the central portion in the vehicle width direction.
PCT/JP2022/040771 2021-11-15 2022-10-31 Vehicle body substructure WO2023085162A1 (en)

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JP2018187986A (en) * 2017-04-28 2018-11-29 トヨタ自動車株式会社 Vehicle lower structure
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JPH0867151A (en) * 1994-08-30 1996-03-12 Nissan Motor Co Ltd Battery mounting structure for electric vehicle
JP2017196952A (en) * 2016-04-26 2017-11-02 トヨタ自動車株式会社 Battery mounting structure of vehicle
JP2018090021A (en) * 2016-11-30 2018-06-14 トヨタ自動車株式会社 Vehicle body lower part structure
JP2018187986A (en) * 2017-04-28 2018-11-29 トヨタ自動車株式会社 Vehicle lower structure
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