WO2022168873A1 - 車両側部構造 - Google Patents
車両側部構造 Download PDFInfo
- Publication number
- WO2022168873A1 WO2022168873A1 PCT/JP2022/004064 JP2022004064W WO2022168873A1 WO 2022168873 A1 WO2022168873 A1 WO 2022168873A1 JP 2022004064 W JP2022004064 W JP 2022004064W WO 2022168873 A1 WO2022168873 A1 WO 2022168873A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- locker
- vehicle
- rocker
- transmission member
- width direction
- Prior art date
Links
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 9
- 230000035939 shock Effects 0.000 claims abstract description 9
- 239000010959 steel Substances 0.000 claims abstract description 9
- 230000005540 biological transmission Effects 0.000 claims description 43
- 239000011324 bead Substances 0.000 claims description 16
- 229920003002 synthetic resin Polymers 0.000 claims description 4
- 239000000057 synthetic resin Substances 0.000 claims description 4
- 229910000838 Al alloy Inorganic materials 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 229910052782 aluminium Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 229910052987 metal hydride Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D21/00—Understructures, i.e. chassis frame on which a vehicle body may be mounted
- B62D21/15—Understructures, i.e. chassis frame on which a vehicle body may be mounted having impact absorbing means, e.g. a frame designed to permanently or temporarily change shape or dimension upon impact with another body
- B62D21/157—Understructures, i.e. chassis frame on which a vehicle body may be mounted having impact absorbing means, e.g. a frame designed to permanently or temporarily change shape or dimension upon impact with another body for side impacts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D25/00—Superstructure or monocoque structure sub-units; Parts or details thereof not otherwise provided for
- B62D25/02—Side panels
- B62D25/025—Side sills thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D27/00—Connections between superstructure or understructure sub-units
- B62D27/02—Connections between superstructure or understructure sub-units rigid
- B62D27/023—Assembly of structural joints
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT 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
- B60K1/00—Arrangement or mounting of electrical propulsion units
- B60K1/04—Arrangement or mounting of electrical propulsion units of the electric storage means for propulsion
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT 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
- B60K1/00—Arrangement or mounting of electrical propulsion units
- B60K1/04—Arrangement or mounting of electrical propulsion units of the electric storage means for propulsion
- B60K2001/0405—Arrangement or mounting of electrical propulsion units of the electric storage means for propulsion characterised by their position
- B60K2001/0438—Arrangement under the floor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
- B60Y2306/00—Other features of vehicle sub-units
- B60Y2306/01—Reducing damages in case of crash, e.g. by improving battery protection
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D25/00—Superstructure or monocoque structure sub-units; Parts or details thereof not otherwise provided for
- B62D25/20—Floors or bottom sub-units
- B62D25/2009—Floors or bottom sub-units in connection with other superstructure subunits
- B62D25/2036—Floors or bottom sub-units in connection with other superstructure subunits the subunits being side panels, sills or pillars
Definitions
- the embodiments disclosed in the present application relate to vehicle side structures.
- Japanese Patent Application Laid-Open No. 2020-29150 discloses a technique in which rockers (also called side sills) as part of the vehicle frame structure extending in the longitudinal direction on the side of the lower part of the vehicle body are all made of extruded aluminum alloy material. It is The locker has a structure in which a plurality of small cylindrical spaces extending in the front-rear direction are joined with the interior divided into small sections. It is designed to absorb the collision energy by being crushed by.
- lockers made of extruded aluminum alloy materials such as those described above tend to have a complicated partition structure in a small space in order to efficiently absorb impact loads. Therefore, it is desired to provide a structure that uses at least a part of a material different from the aluminum alloy extruded material and that can efficiently transmit the impact load to the impact absorbing member.
- One aspect is a vehicle side structure, which includes a rocker extending in the longitudinal direction of the vehicle and an impact absorbing member adjacent to the rocker that absorbs the impact energy from the outer side in the vehicle width direction.
- the locker consists of a steel plate locker inner panel with a hat-shaped cross section that opens outward in the vehicle width direction, and a steel locker outer panel with a hat-shaped cross section that opens inward in the vehicle width direction.
- a cylindrical internal space is formed by joining them with their openings facing each other.
- the lower surface of the rocker is positioned lower on the outer side than on the inner side in the vehicle width direction to form a stepped shape, thereby forming a downwardly extending space in the inner space of the rocker.
- a shock absorbing member is disposed adjacent to the downwardly extending space on the inner side in the vehicle width direction, and in the downwardly extending space, an elongated shape extending along the rocker and a locker inner panel and the rocker is provided. It has a load transmission member that forms a closed cross section by being joined to any one of the outer panels. An impact load from the outer side in the vehicle width direction is transmitted to the impact absorbing member through the load transmission member.
- the load transmission member forms a closed cross section by joining with the locker inner panel.
- the load transmission member is joined to the lower end surface of the locker inner panel.
- the load transmission member forms a closed cross-sectional portion with a side wall surface facing the outer locker panel, an upper wall surface extending from the side wall surface to the inner locker panel, and a lower wall surface extending from the side wall surface to the inner locker panel.
- the rocker outer panel has a pair of first members extending in the longitudinal direction of the vehicle at positions adjacent to the upper side and the lower side of the side wall surface and projecting toward the inner space side of the locker at a height overlapping the load transmission member. Beads are provided.
- the load transmission member is joined to the rocker outer panel to form a closed cross section.
- the load transmission member includes a plurality of second beads that extend along the vehicle width direction and are spaced apart in the vehicle front-rear direction.
- the load transmission member has a joint that is spot welded to the locker inner panel or the rocker outer panel.
- the shock absorbing member is configured with a honeycomb structure in which a plurality of synthetic resin cylindrical bodies are joined.
- the rocker can be made of a material different from the aluminum alloy extruded material, and the impact load can be efficiently transmitted to the impact absorbing member in the event of a collision in the vehicle width direction.
- FIG. 2 is a cross-sectional view schematically showing the lower portion of the vehicle body according to one embodiment from the front side in the vehicle front-rear direction.
- FIG. 2 is a perspective view of a structure including a locker on the left side of the vehicle body lower portion of FIG. 1;
- Figure 3 is an exploded perspective view of the structure of Figure 2;
- FIG. 3 is a cross-sectional view schematically showing a state in which an impact load is applied to the rocker of the structure shown in FIG. 2;
- FIG. 11 is a cross-sectional view schematically showing a state in which an impact load is applied to a locker having a structure according to another embodiment;
- FIG. 1 is a cross-sectional view schematically showing the lower part of the vehicle body from the front side as one embodiment.
- the vehicle is, for example, an electric vehicle, a gasoline hybrid vehicle, a fuel cell hybrid vehicle, or the like, which runs using an electric motor (motor) (not shown) as a drive source. (not shown)), a battery pack 80 as a battery for storing electric power to be supplied to the electric motor is mounted.
- Aluminum frames 90 extend along the vehicle front-rear direction on both sides of the battery pack 80 in the vehicle width direction.
- the aluminum frame 90 is formed in a cylindrical shape by, for example, extruding or drawing from an aluminum alloy.
- the battery pack 80 normally incorporates a plurality of battery modules and a battery ECU (Electronic Control Unit), is unitized as a battery system so as to be mounted on a vehicle, and is formed in a flat box shape, for example.
- a battery module is configured by connecting a plurality of battery cells (cells) that can be discharged and charged.
- a battery cell is, for example, a storage battery such as a lithium-ion battery or a nickel-metal hydride battery.
- a battery ECU is an electronic control unit for the battery pack 80 .
- a floor panel (not shown) extends along the width direction of the vehicle and the front-rear direction of the vehicle on the lower portion of the vehicle body.
- Rockers 10 and 20 extend in the longitudinal direction of the vehicle at both ends of the floor panel in the vehicle width direction.
- a cross member (not shown) spans across the vehicle width direction between the left and right rockers 10 and 20 on the floor panel.
- a shock absorbing member 70 is arranged between each rocker 10, 20 and the aluminum frame 90, respectively.
- FIG. 2 is a perspective view showing a portion of the left side of the vehicle side structure.
- FIG. 3 is an exploded perspective view showing a portion of the left side of the vehicle side structure.
- FIG. 4 is a cross-sectional view schematically showing a state in which an impact load F is input to the locker 20 of the vehicle to which the vehicle side structure is applied.
- the rockers 10 and 20 extend in the vehicle front-rear direction on the sides in the vehicle width direction and function as part of the frame structure of the vehicle.
- the left and right lockers 10 and 20 generally have symmetrical structures, the left locker 20 will be used as a representative to describe the detailed configuration, and a detailed description of the locker 10 will be omitted.
- the locker 20 has a cylindrical inner space 22 formed by overlapping and joining a locker inner panel 30 and a locker outer panel 40 with their openings facing each other. is doing.
- the locker inner panel 30 is made of steel and has a hat-shaped cross section with an opening on the outer side in the vehicle width direction.
- the locker inner panel 30 can be configured with a hat-shaped cross section having, from top to bottom, an upper flange surface 31, an upper end surface 32, a side wall surface 33, a lower end surface 34, a standing surface 35, and a lower flange surface 36. can.
- the upper flange surface 31 extends in the vertical direction of the vehicle and is joined to an upper flange surface 41 of a locker outer panel 40 which will be described later.
- the upper end surface 32 bends from the lower edge of the upper flange surface 31 and extends inward in the vehicle width direction.
- the side wall surface 33 bends from the inner edge of the upper end surface 32 and extends downward in the vehicle vertical direction.
- the lower end surface 34 bends from the lower edge of the side wall surface 33 and extends outward in the vehicle width direction.
- the standing surface 35 bends from the outer edge of the lower end surface 34 and extends downward in the vehicle vertical direction.
- the lower flange surface 36 extends from the standing surface 35 and is joined to a lower flange surface 46 of the rocker outer panel 40, which will be described later.
- the rocker outer panel 40 is made of steel and has a hat-shaped cross section with an opening on the inner side in the vehicle width direction.
- the rocker outer panel 40 can be configured with a hat-shaped cross section having, from top to bottom, an upper flange surface 41, an upper end surface 42, a side wall surface 43, a lower end surface 44, and a lower flange surface 46.
- the upper flange surface 41 extends in the vertical direction of the vehicle and is joined to the upper flange surface 31 of the locker inner panel 30 described above.
- the upper end surface 42 bends from the lower edge of the upper flange surface 41 and extends outward in the vehicle width direction.
- the side wall surface 43 bends from the outer edge of the upper end surface 42 and extends downward in the vehicle vertical direction.
- the lower end surface 44 bends from the lower edge of the side wall surface 43 and extends inward in the vehicle width direction.
- the lower flange surface 46 bends from the inner edge of the lower end surface 44 and extends downward in the vehicle vertical direction, and is joined to the lower flange surface 36 of the locker inner panel 30 described above.
- the locker inner panel 30 and the locker outer panel 40 are overlapped with their openings facing each other. Then, the upper flange surface 31 and the upper flange surface 41 are joined by spot welding, for example. Also, the lower flange surface 36 and the lower flange surface 46 are joined by spot welding, for example.
- the locker 20 thus forms a cylindrical internal space 22 .
- the side wall surface 43 of the locker outer panel 40 is set longer than the side wall surface 33 of the locker inner panel 30 . That is, the length of the side wall surface 43 of the locker outer panel 40 is approximately the same length as the total length of the side wall surface 33 and the standing surface 35 of the locker inner panel 30 . Therefore, looking at the positional relationship in the vertical direction of the vehicle, the lower end face 34 of the locker inner panel 30 is positioned relatively higher, and the lower end face 44 of the locker outer panel 40 is positioned lower. Therefore, the inner space 22 of the rocker 20 has a stepped shape in which the outer lower surface in the vehicle width direction extends downward relative to the inner lower surface of the lower surface of the locker 20, thereby forming a downwardly extending space 24. have.
- a load transmission member 60 is provided in the downward extension space 24 .
- the load transmission member 60 has an elongated shape extending along the rocker 20 and is joined to either the locker inner panel 30 or the rocker outer panel 40 to form a closed cross section. As one embodiment, the load transmission member 60 forms a closed cross section by being joined to the locker inner panel 30 .
- the load transmission member 60 has an upper joint surface 61 , an upper wall surface 62 , a side wall surface 64 , a lower wall surface 66 , and a lower joint surface 67 . Constructs a closed section.
- the cross-section of the load transmission member 60 itself taken in the vehicle width direction can generally be a sideways U-shape, and specifically can be configured as follows.
- the upper joint surface 61 is joined to the lower end surface 34 of the locker inner panel 30 by spot welding.
- the upper wall surface 62 extends from the upper joint surface 61 and extends from the locker inner panel 30 side toward the locker outer panel 40 side.
- the side wall surface 64 is bent from the outer edge of the upper wall surface 62 to face the locker outer panel 40 with a gap therebetween.
- the lower wall surface 66 is bent from the lower edge of the side wall surface 64 and folded back toward the locker inner panel 30 side.
- the lower joint surface 67 is bent from the lower wall surface 66 to face the standing surface 35 of the locker inner panel 30 and is joined to the standing surface 35 by spot welding.
- the load transmission member 60 also has a plurality of beads 68 extending in the vehicle width direction spaced apart in the vehicle front-rear direction.
- the rocker outer panel 40 has upper side walls extending in the longitudinal direction of the vehicle and protruding toward the inner space 22 of the rocker 20 at positions adjacent to the upper side and the lower side of the side wall surface 64 of the load transmission member 60 so as to sandwich the side wall surface 64 of the load transmission member 60 .
- a bead 43a and a lower bead 43b are provided.
- the upper bead 43 a and the lower bead 43 b project further inward in the vehicle width direction than the side wall surface 64 and are formed to have a height so as to overlap the load transmission member 60 .
- the impact absorbing member 70 has a function of absorbing impact energy from the outer side in the vehicle width direction by adjoining the rocker 20 .
- the impact absorbing member 70 is arranged between the downward extension space 24 of the locker 20 and the aluminum frame 90 .
- the impact absorbing member 70 can be made of synthetic resin, for example, and can be formed in a box shape as a whole.
- the shock absorbing member 70 can be configured with a honeycomb structure in which a plurality of hollow cylindrical bodies 72 extending in the vehicle width direction are joined together. For example, it is configured with a honeycomb structure in which regular hexagonal hollow cylindrical bodies 72 are joined.
- FIG. 4 is a cross-sectional view schematically showing a state in which an impact load F is input to the rocker 20 of the vehicle to which the vehicle side structure described above is applied.
- part of the impact load F exerted from the outer side in the vehicle width direction is transmitted from the side wall surface 43 of the rocker 20 to the lower portion of the impact absorbing member 70 through the lower end surface 44 .
- the side wall surface 43 of the rocker 20 and the side wall surface 64 of the load transmission member 60 come into contact with each other, a portion of the impact load F is transmitted to the upper portion of the impact absorption member 70 through the upper wall surface 62 and through the lower wall surface 66.
- the locker 20 can have a simple structure made of steel plate, unlike an aluminum alloy extruded material.
- the rocker 120 and the load transmission member 160 can be transformed into various forms.
- the locker 120 may vary in the form of flanges that join the locker inner panel 130 and the locker outer panel 140 together.
- the lower flange surfaces 136 and 146 may be bent toward each other and overlapped and joined.
- Various forms can be applied to the upper flange surfaces 131 and 141 as well.
- the load transmission member 160 may be a member that forms a closed cross section by being joined to the rocker outer panel 40 .
- the rocker 120 may be provided with a structure similar to that of the upper bead 43a and the lower bead 43b.
- the load transmission member 160 may be provided with a configuration similar to that of the bead 68 .
- the impact load F received when the pole collides with the side of the vehicle is distributed over the entire impact absorbing member 70 in both the vertical and longitudinal directions via the rocker 120 and the load transmission member 160. transmitted.
- the locker 20 forms the tubular inner space 22 with the steel plate inner panel 30 and the locker outer panel 40 having a hat-shaped cross section.
- the lower surface of the rocker 20 is positioned lower on the outer side in the vehicle width direction than on the inner side, thereby forming a stepped shape.
- a shock absorbing member 70 is arranged adjacent to the downwardly extending space 24 on the inner side in the vehicle width direction, and in the downwardly extending space 24, an elongated body extending along the rocker 20 is provided. and has a load transmission member 60 that forms a closed cross-sectional portion by being joined to either the locker inner panel 30 or the rocker outer panel 40 .
- the rocker 20 can be made of a material different from the aluminum alloy extruded material, and the impact load F can be efficiently transmitted to the impact absorbing member 70 in the event of a collision in the vehicle width direction.
- the load transmission member 60 forms a closed cross section by being joined to the locker inner panel 30, so that the arrangement position of the closed cross section in the downward extension space 24 can be easily set. Therefore, it is possible to provide a structure in which the impact load F can be transmitted to the impact absorbing member 70 more efficiently.
- the load transmission member 60 is joined to the lower end surface 34 of the locker inner panel 30, so that the load transmission member 60 is joined along the direction (horizontal direction) in which the impact load F is exerted.
- the structure can be such that the member does not easily fall down.
- the load transmission member 60 includes a side wall surface 64 facing the locker outer panel 40 , an upper wall surface 62 extending from the side wall surface 64 to the locker inner panel 30 , and a lower wall surface 66 extending from the side wall surface 64 to the locker inner panel 30 . constitutes a closed cross section.
- the locker outer panel 40 is provided with upper and lower beads 43 a and 43 b that extend in the vehicle front-rear direction and protrude toward the interior space 22 of the locker 20 at positions adjacent to the upper and lower sides of the side wall surface 64 .
- the upper bead 43 a and the lower bead 43 b are formed to have a height so as to overlap the load transmission member 60 . Therefore, the vertical tilt of the load transmission member 60 can be suppressed.
- the load transmission member 60 is joined to the rocker outer panel 40 to form a closed cross section. Therefore, depending on the shape of the downward extension space, the load transmission member 60 can be joined to the rocker outer panel side, and the degree of freedom in design can be improved.
- the load transmission member 60 is formed with a plurality of beads 68 that extend along the vehicle width direction and are spaced apart in the vehicle front-rear direction. can be improved.
- the load transmission member 60 has an upper joint surface 61 and a lower joint surface 67 that are spot-welded to the locker inner panel 30 or the rocker outer panel 40, the joints can be efficiently joined. can.
- the weight of the impact absorbing member 70 can be reduced by configuring the impact absorbing member 70 with a honeycomb structure in which a plurality of cylindrical bodies 72 made of synthetic resin are joined.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Body Structure For Vehicles (AREA)
- Arrangement Or Mounting Of Propulsion Units For Vehicles (AREA)
Abstract
Description
図1は、ひとつの実施形態としての、車体下部を前側から模式的に示した断面図である。図1に示すように、車両は、例えば、図示しない電動機(モータ)を駆動源として走行する、電動自動車、ガソリンハイブリッド車、燃料電池ハイブリッド車等であり、車体下部のフロアを構成するフロアパネル(不図示)の下方に電動機へ供給される電力を蓄電するバッテリとしての電池パック80が搭載されている。また、電池パック80の車両幅方向の両側には、車両前後方向に沿ってアルミニウムフレーム90が延在している。アルミニウムフレーム90は、例えば、アルミニウム合金により押し出し加工、引き抜き加工などによって筒状に形成されている。
電池パック80は、通常、複数の電池モジュールと電池ECU(Electronic Control Unit)を内蔵し、電池システムとして車載可能にユニット化されたものであり、例えば、扁平な箱形状に形成される。電池モジュールは、放電・充電が可能な電池セル(単電池)を複数接続して構成される。電池セルは、例えば、リチウムイオン電池、ニッケル水素電池などの蓄電池である。電池ECUは、電池パック80のための電子制御ユニットである。
車体下部には、車両幅方向及び車両前後方向に沿ってフロアパネル(不図示)が延在している。フロアパネルの車両幅方向の両端には、車両前後方向に沿ってロッカー10、20がそれぞれ延在している。フロアパネルの上には、左右のロッカー10、20の間において、車両幅方向に沿ってクロスメンバ(不図示)が架け渡されている。各ロッカー10、20とアルミニウムフレーム90の間には、それぞれ衝撃吸収部材70が配設されている。
図2は、車両側部構造の左側の一部を示した斜視図である。図3は、車両側部構造の左側の一部を示した分解斜視図である。図4は、車両側部構造が適用された車両のロッカー20に衝撃荷重Fが入力された状態を模式的に示した断面図である。ロッカー10、20は、車幅方向の側方において車両前後方向に延在して車両の骨格構造の一部として機能されるものである。ここで、左右のロッカー10、20は通常、互いに対称的な構造であるため、代表して詳細構成を左側のロッカー20を用いて説明することとし、ロッカー10についての詳細説明は省略する。図2から図4に示すように、ロッカー20は、ロッカーインナパネル30と、ロッカーアウタパネル40とが互いの開口を対向させた状態で重ね合わせて接合されることで筒状の内部空間22を構成している。
荷重伝達部材60は、ロッカー20に沿って延在する長尺状であると共にロッカーインナパネル30又はロッカーアウタパネル40のいずれかと接合されることで閉断面部を構成する。ひとつの実施形態として、荷重伝達部材60は、ロッカーインナパネル30と接合されることで閉断面部を構成する。荷重伝達部材60は、上方接合面61、上壁面62と、側壁面64と、下壁面66と、下方接合面67を有しており、ロッカーインナパネル30と接合されて下方延長空間24内に閉断面部を構成する。
衝撃吸収部材70は、ロッカー20と隣接することで車幅方向の外方側からの衝突エネルギーを吸収する機能を有する。衝撃吸収部材70は、ロッカー20の下方延長空間24とアルミニウムフレーム90の挟まれた位置に配設されている。衝撃吸収部材70は、例えば合成樹脂製とし、全体として箱型形状に形成することができる。ひとつの実施形態として、衝撃吸収部材70は、車幅方向に延びる中空の筒状体72が複数結合したハニカム構造で構成することができる。例えば、正六角形の中空の筒状体72が結合したハニカム構造で構成される。
図4は、上述の車両側部構造が適用された車両のロッカー20に衝撃荷重Fが入力された状態を模式的に示した断面図である。ここで、車幅方向の外方側から及ぼされる衝撃荷重Fの一部は、ロッカー20の側壁面43から下端面44を通じて衝撃吸収部材70の下側部分に伝達される。また、衝撃荷重Fの一部は、ロッカー20の側壁面43と荷重伝達部材60の側壁面64が接触すると、上壁面62を通じて衝撃吸収部材70の上側部分に伝達されるとともに、下壁面66を通じて衝撃吸収部材70の中段部分に伝達される。ポール等の幅の狭い障害物が車両側面に衝突した場合に受ける衝撃荷重Fはロッカー20の長さ方向の一部に局所的に集中するが、上述の実施形態の車両側部構造であれば、その荷重Fがロッカー20と荷重伝達部材60とを介して上下、前後の両方向について衝撃吸収部材70の全体に分散して伝達されるため、効率よく衝突エネルギーを吸収することができる。また、ロッカー20は、アルミニウム合金の押出材とは異なり鋼板製による簡素な構造によって骨格を構成できる。
図5に示すように、ロッカー120や荷重伝達部材160は、様々な形態に変形することができる。例えば、ロッカー120は、ロッカーインナパネル130とロッカーアウタパネル140を互いに接合するフランジの形態を変形することができる。一つの実施形態として、下方フランジ面136、146のように互いに近接する方向に屈曲して重ね合わせて接合する形態であってもよい。上方フランジ面131、141も同様に、種々の形態を適用できる。また別の実施形態として、荷重伝達部材160は、ロッカーアウタパネル40と接合されることで閉断面部を構成する部材であってもよい。また、ロッカー120には、上方ビード43a、下方ビード43bと同様の構成を設けてもよい。荷重伝達部材160には、ビード68と同様の構成を設けてもよい。これらの実施形態であっても、ポールが車両側面に衝突した場合に受ける衝撃荷重Fはロッカー120と荷重伝達部材160とを介して上下、前後の両方向について衝撃吸収部材70の全体に分散して伝達される。
最後に上記実施形態の利点を挙げる。
Claims (8)
- 車両側部構造であって、
車両前後方向に延在したロッカーと、
前記ロッカーと隣接する衝撃吸収部材とを有し、
前記ロッカーは、車幅方向の外方側が開口したハット状断面で構成された鋼板製のロッカーインナパネルと、車幅方向の内方側が開口したハット状断面で構成された鋼板製のロッカーアウタパネルとが互いの開口を対向させた状態で接合されることで筒状の内部空間を形成しており、
前記ロッカーの下面が車幅方向の外方側において内方側よりも下方に位置することで段差形状とされ、これにより前記ロッカーの内部空間に下方延長空間が形成されており、
前記衝撃吸収部材が前記下方延長空間に対し車幅方向の内方側に隣接して配置されており、
前記下方延長空間内には、前記ロッカーに沿って延在する長尺状であると共に前記ロッカーインナパネルと前記ロッカーアウタパネルのいずれかと接合されることで閉断面部を形成する荷重伝達部材を有し、
車幅方向の外方側からの衝撃荷重が前記荷重伝達部材を通じて前記衝撃吸収部材に伝達される、車両側部構造。 - 請求項1に記載の車両側部構造であって、前記荷重伝達部材は、前記ロッカーインナパネルと接合されることで前記閉断面部を形成している車両側部構造。
- 請求項2に記載の車両側部構造であって、前記荷重伝達部材は、前記ロッカーインナパネルの下端面と接合されている車両側部構造。
- 請求項2または請求項3に記載の車両側部構造であって、
前記荷重伝達部材は、前記ロッカーアウタパネルと対向する側壁面と、前記側壁面から前記ロッカーインナパネルまで延在する上壁面と、前記側壁面から前記ロッカーインナパネルまで延びる下壁面によって、前記閉断面部を形成しており、
前記ロッカーアウタパネルには、前記側壁面の上側と下側に隣接した位置において、車両前後方向に沿って延び前記ロッカーの内部空間側に前記荷重伝達部材と重なる高さで突出する一対の第1のビードが設けられている、車両側部構造。 - 請求項1に記載の車両側部構造であって、前記荷重伝達部材が前記ロッカーアウタパネルと接合されることで閉断面部を形成している車両側部構造。
- 請求項1から請求項5のいずれか1項に記載の車両側部構造であって、前記荷重伝達部材は、車幅方向に沿って延び車両前後方向に間隔を隔てて配置された複数の第2のビードを備えている、車両側部構造。
- 請求項1から請求項6のいずれか1項に記載の車両側部構造であって、前記荷重伝達部材は、前記ロッカーインナパネルまたは前記ロッカーアウタパネルに対しスポット溶接で接合された接合部を有する車両側部構造。
- 請求項1から請求項7のいずれか1項に記載の車両側部構造であって、前記衝撃吸収部材は、合成樹脂の複数の筒状体が結合されたハニカム構造で構成されている車両側部構造。
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