WO2023188517A1 - Structure inférieure pour véhicule - Google Patents

Structure inférieure pour véhicule Download PDF

Info

Publication number
WO2023188517A1
WO2023188517A1 PCT/JP2022/042135 JP2022042135W WO2023188517A1 WO 2023188517 A1 WO2023188517 A1 WO 2023188517A1 JP 2022042135 W JP2022042135 W JP 2022042135W WO 2023188517 A1 WO2023188517 A1 WO 2023188517A1
Authority
WO
WIPO (PCT)
Prior art keywords
vehicle
side sill
cross member
width direction
reinforcement
Prior art date
Application number
PCT/JP2022/042135
Other languages
English (en)
Japanese (ja)
Inventor
湧哉 舘野
祐太郎 陸川
Original Assignee
三菱自動車工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 三菱自動車工業株式会社 filed Critical 三菱自動車工業株式会社
Publication of WO2023188517A1 publication Critical patent/WO2023188517A1/fr

Links

Images

Classifications

    • 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

Definitions

  • the present invention relates to a vehicle lower structure.
  • the present invention has been devised in view of the above circumstances, and an object of the present invention is to provide a vehicle lower structure that is advantageous in suppressing vehicle body deformation in both frontal collisions and side collisions. .
  • an embodiment of the present invention includes a side sill extending in the longitudinal direction of the vehicle and provided on both sides of the vehicle width direction, and a side sill extending along the side sill and joined to the side sill.
  • a side sill reinforcement, and a front cross member and a rear cross member that extend in the vehicle width direction at intervals in the longitudinal direction of the vehicle and whose ends are coupled to the side sill reinforcement, the side sill reinforcement comprising:
  • the lower structure of the vehicle extends from the front of the front cross member to the rear of the rear cross member, and the side sill is spaced from the connection point of the side sill reinforcement and the rear cross member to the rear of the vehicle. It is characterized by a weak part provided at the reinforcement location.
  • the strength and rigidity of the side sill against the load input from the front of the vehicle during a frontal collision of the vehicle is increased. can be ensured. Furthermore, by providing a weak part in the side sill reinforcement that is located away from the connection point between the side sill reinforcement and the rear cross member to the rear of the vehicle, the bending point of the side sill in the event of a side collision is displaced to the rear of the vehicle from the connection point. This is advantageous in ensuring that the load input during a side collision is received by the cross member. Therefore, this is advantageous in suppressing vehicle body deformation due to both frontal collisions and side collisions.
  • FIG. 1 is a plan view showing a lower structure of a vehicle according to an embodiment.
  • FIG. 2 is a perspective view of a side sill, a B-pillar, a front cross member, and a rear cross member to which side sill reinforcements are joined, viewed from the inside in the vehicle width direction.
  • FIG. 3 is an enlarged perspective view of a joint portion between a side sill, a rear cross member, and a B pillar. It is a sectional view of a part where a side sill and a side sill reinforcement are joined.
  • FIG. 2 is an explanatory diagram illustrating the relationship between a load F1 input at the time of a side collision and a reaction force F2 of a rear cross member.
  • the symbol UP indicates the upper side of the vehicle
  • the symbol FR indicates the front of the vehicle
  • the symbol IN indicates the inside in the vehicle width direction
  • the symbol OUT indicates the outside in the vehicle width direction.
  • the vehicle is an electric vehicle whose drive source is an electric motor driven by electric power supplied from a battery
  • the present invention is of course applicable to vehicles other than electric vehicles. It is.
  • a vehicle body 10 to which this embodiment is applied is a monocoque body in which a body and a chassis are integrated.
  • the lower part of the vehicle body 10 includes a floor panel 12, a center tunnel 14, a pair of side sills 16, an A pillar 18, a B pillar 20, a C pillar 22, a front cross member 24, a rear cross member 26, It is configured to include a side sill reinforcement 28.
  • the center tunnel 14, the pair of side sills 16, the A-pillar 18, the B-pillar 20, the C-pillar 22, the front cross member 24, the rear cross member 26, and the side sill reinforcement 28 are vehicle frame members. Function.
  • the floor panel 12 is constituted by a panel member extending in the vehicle longitudinal direction and the vehicle width direction, and a cutout 1202 for arranging a drive source such as an electric motor or an engine is provided in the front part of the floor panel 12.
  • the center tunnel 14 protrudes upward at the center of the front part of the floor panel 12 in the vehicle width direction and extends in the vehicle longitudinal direction, and its rear end is connected to the rear cross member 26.
  • the pair of side sills 16 are provided on both sides of the floor panel 12 in the vehicle width direction, extending from the front to the rear of the floor panel 12 in the longitudinal direction of the vehicle.
  • the front cross member 24 is a place where the front leg of a front seat (not shown) is attached
  • the rear cross member 26 is a place where the rear leg of the front seat is attached.
  • the lower parts of the front cross member 24 and the rear cross member 26 are joined to the upper surface of the floor panel 12, and the inner ends of the front cross member 24 and the rear cross member 26 in the vehicle width direction are joined to the center tunnel 14, The outer end in the width direction is connected to the side sill 16.
  • a battery (not shown) is arranged below the floor panel 12 between the front cross member 24 and the rear cross member 26 at the center of the floor panel 12 in the vehicle width direction.
  • a covering portion 30 is provided to protrude upward from other portions of the floor panel 12.
  • the A-pillar 18, the B-pillar 20, and the C-pillar 22 are each provided upwardly from a portion of the pair of side sills 16 spaced apart from each other in the longitudinal direction of the vehicle.
  • the side sill 16 includes a side sill inner wall 1602 facing inward in the vehicle width direction, a side sill outer wall 1604 facing outward in the vehicle width direction, and a side sill lower wall facing downward and joined to the floor panel 12. 1606 and an upwardly facing side sill top wall 1608.
  • the B pillar 20 is attached to the side sill 16 by joining the lower end flange 2002 to the side sill inner wall 1602, the side sill outer wall 1604, and the side sill upper wall 1608.
  • a pillar 18 and a C-pillar 22 are also attached to the side sill 16.
  • an opening 2004 for arranging a seat belt retractor (not shown) is provided at the lower end of the inner surface of the B-pillar 20 facing inward in the vehicle width direction.
  • the side sill reinforcement 28 is provided to extend along the side sill 16 and to be joined to the inside of the side sill 16.
  • the side sill reinforcement 28 extends from the front of the front cross member 24 to the rear of the rear cross member 26 of the vehicle.
  • the side sill reinforcement 28 has a U-shape, and has a reinforcement inner surface 2802 joined to the inner surface of the side sill inner wall 1602 and a reinforcement upper surface 2804 joined to the inner surface of the side sill upper wall 1608. , and a reinforcement lower surface 2805 joined to the inner surface of the side sill lower wall 1606.
  • both ends of the rear cross member 26 in the vehicle width direction are joined to the reinforcement inner side surface 2802 via a flange 2602. Therefore, both ends of the rear cross member 26 in the vehicle width direction is coupled to the reinforcement inner surface 2802 via the side sill inner wall 1602 of the side sill 16.
  • the rear end 2810 of the side sill reinforcement 28 is located at the rear of the vehicle from the joining point X between the side sill 16 and the B-pillar 20, and more specifically, the rear end 2810 is located at the rear of the vehicle from the flange 2002 of the B-pillar 20 that is joined to the side sill 16. positioned.
  • a weak portion 32 having lower strength than other portions is provided at a portion of the side sill reinforcement 28 that is spaced toward the rear of the vehicle from the joint portion X between the side sill 16 and the rear cross member 26.
  • the weakened portion 32 includes a bent portion 34 extending vertically toward the outer side in the vehicle width direction on the reinforcement inner surface 2802.
  • the weakened portion 32 is composed of a bent portion 34 that is convex outward in the vehicle width direction, but the weakened portion 32 is formed of a bent portion 34 that is convex outward in the vehicle width direction, and Various conventionally known structures can be adopted as the fragile part 32, such as a thin part where part of the side surface 2802 is thinner than other parts, or a part where an opening is provided or the wall thickness is cut out. be.
  • the fragile portion 32 is provided within the width of the opening 2004 along the vehicle longitudinal direction when viewed from the vehicle width direction.
  • the breaking point is the point where the side sill 16 breaks due to the load input from the side of the vehicle when a pole collides with the intermediate portion between the front cross member 24 and the rear cross member 26 from the side of the vehicle, a so-called pole side collision. do.
  • a weak portion 32 having lower strength than other portions is provided at a portion of the side sill reinforcement 28 that is spaced toward the rear of the vehicle from the connection point X between the side sill reinforcement 28 and the rear cross member 26.
  • F1 is the input load of the pole that is input to the side sill 16 at the time of a side collision with the pole.
  • F2 is a reaction force applied from the rear cross member 26 to the side sill 16 during a pole side collision.
  • L1 is the distance from the pole to the connection point X between the side sill reinforcement 28, the rear cross member, and the rear cross member in the longitudinal direction of the vehicle, and this distance L1 is constant.
  • L2 is the distance from the joining point X of the side sill reinforcement 28 and the rear cross member to the bending point P.
  • the balance of moments around the bending point P can be expressed using the following formula.
  • F1(L1+L2)-F2 ⁇ L2 0...(1)
  • F2 F1(L1+L2)/L2...(2).
  • F2 (F1 ⁇ L1)/L2+F1 (3).
  • the reaction force F2 of the rear cross member 26 decreases. Therefore, the load that is input in the event of a side collision with a pole is reliably received by the rear cross member 26, and the deformation of the side sill 16 inward in the vehicle width direction is suppressed, which is advantageous in preventing the pole from entering. Therefore, without increasing the wall thickness of the side sill reinforcement 28 or the rear cross member 26, that is, without increasing weight or deteriorating fuel efficiency, it is possible to suppress vehicle body deformation due to both frontal collisions and pole side collisions. It will be advantageous above.
  • the lower end of the B-pillar 20 is coupled to the side sill 16, and the rear end 2810 of the side sill reinforcement 28 is located at the rear of the vehicle from the coupling point X between the side sill 16 and the B-pillar 20.
  • the side sill reinforcement 28 is more advantageous in ensuring the strength and rigidity of the side sill reinforcement 28 against a frontal collision, and it is more advantageous in suppressing deformation of the side sill 16, that is, deformation of the vehicle body, due to a frontal collision.
  • an opening 2004 for arranging a seat belt retractor is formed at the lower part of the B-pillar 20, and when viewed from the vehicle width direction, there is a weak point within the width of the opening 2004 along the longitudinal direction of the vehicle.
  • a section 32 is provided. Therefore, the area within the width of the opening 2004 is a place where stress is concentrated in the event of a side collision, and if the weakened part 32 spaced from the connection point X to the rear of the vehicle is provided at the place where such stress is concentrated, the side sill 16
  • the bending point P which is the bending point, can be placed closer to the fragile portion 32.
  • the weakened portion 32 may be provided at such a location, but as in the present embodiment, the weakened portion 32 is provided within the width range of the opening 2004 along the vehicle longitudinal direction when viewed from the vehicle width direction. This is more advantageous in achieving the effect of displacing the bending point P to the rear of the vehicle than the joining point X between the side sill 16 and the B-pillar 20, and is more advantageous in suppressing vehicle body deformation due to a pole side collision.
  • the weakened portion 32 is constituted by a bent portion 34 that is convex in the vehicle width direction and extends in the vertical direction on the inner surface of the side sill reinforcement 28 in the vehicle width direction. Therefore, compared to the case where the fragile part 32 is formed of a thin part or a cutout part, the structure of the fragile part 32 can be simplified, which is advantageous in reducing costs.
  • the battery when viewed from above, the battery is disposed between the front cross member 24 and the rear cross member 26, so that deformation of the side sill 16, that is, deformation of the vehicle body 10, is prevented in the event of a side collision with a pole.
  • This is advantageous in protecting the battery because it can prevent the pole from entering.
  • Vehicle body 12 Floor panel 1202 Notch 14 Center tunnel 16 Side sill 1602 Side sill inner wall 1604 Side sill outer wall 1606 Side sill lower wall 1608 Side sill upper wall 18 A pillar 20 B pillar 2002 Flange 2004 Opening 22 C pillar 24 Cross member (front cross member ) 26 Cross member (rear cross member) 2602 Flange 28 Side sill reinforcement 2802 Reinforcement inner surface 2804 Reinforcement upper surface 2810 Rear end 30 Covering portion 32 Weak portion 34 Bent portion X Connection location (connection point) P break point

Abstract

Cette structure inférieure pour un véhicule comprend : des bas de caisse latéraux qui s'étendent dans une direction avant-arrière du véhicule et qui sont disposés des deux côtés dans une direction de largeur du véhicule ; des renforts de bas de caisse latéraux qui s'étendent le long des bas de caisse latéraux et qui sont joints aux bas de caisse latéraux ; et un élément transversal côté avant et un élément transversal côté arrière qui s'étendent dans la direction de la largeur du véhicule et qui présentent des parties d'extrémité jointes aux renforts de bas de caisse latéraux. Les renforts de bas de caisse latéraux sont des structures inférieures du véhicule, et s'étendent depuis l'avant de l'élément transversal côté avant vers l'arrière de l'élément transversal côté arrière. Des parties fragiles sont disposées dans des parties des renforts de bas de caisse latéraux espacés en direction de l'arrière du véhicule à partir de parties de jonction des renforts de bas de caisse latéraux et de l'élément transversal côté arrière.
PCT/JP2022/042135 2022-03-28 2022-11-11 Structure inférieure pour véhicule WO2023188517A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2022-051470 2022-03-28
JP2022051470 2022-03-28

Publications (1)

Publication Number Publication Date
WO2023188517A1 true WO2023188517A1 (fr) 2023-10-05

Family

ID=88199961

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2022/042135 WO2023188517A1 (fr) 2022-03-28 2022-11-11 Structure inférieure pour véhicule

Country Status (1)

Country Link
WO (1) WO2023188517A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002120766A (ja) * 2000-10-11 2002-04-23 Mitsubishi Motors Corp 車両のサイドシル構造
JP2003312549A (ja) * 2002-04-17 2003-11-06 Nissan Motor Co Ltd 車体骨格フレームの補強構造
JP2010247795A (ja) * 2009-04-20 2010-11-04 Mazda Motor Corp 車両の下部車体構造
JP2011057146A (ja) * 2009-09-11 2011-03-24 Daihatsu Motor Co Ltd 車両の車体側部構造

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002120766A (ja) * 2000-10-11 2002-04-23 Mitsubishi Motors Corp 車両のサイドシル構造
JP2003312549A (ja) * 2002-04-17 2003-11-06 Nissan Motor Co Ltd 車体骨格フレームの補強構造
JP2010247795A (ja) * 2009-04-20 2010-11-04 Mazda Motor Corp 車両の下部車体構造
JP2011057146A (ja) * 2009-09-11 2011-03-24 Daihatsu Motor Co Ltd 車両の車体側部構造

Similar Documents

Publication Publication Date Title
EP1808362B1 (fr) Carrosserie de véhicule
JP4286884B2 (ja) 自動車の車体構造
EP2740651A1 (fr) Structure latérale de carrosserie de véhicule
JP2010173562A (ja) 車両の側部車体構造
JPWO2013172132A1 (ja) 車体前部構造
EP2783951B1 (fr) Superstructure de carrosserie de véhicule
JP2008284936A (ja) 自動車の側部車体構造
CN108974133B (zh) 车身前部构造
JP3876279B2 (ja) 自動車のピラー補強構造
CN109562794B (zh) 车身构造
US20200298915A1 (en) Vehicle lower portion structure
CN110884567B (zh) 车辆的前部车身结构
WO2023188517A1 (fr) Structure inférieure pour véhicule
JP2014040209A (ja) 車両の車体下部構造
JP7177816B2 (ja) 車体前部構造
KR100280940B1 (ko) 자동차의 차체 하부 보강구조
CN113173139A (zh) 车辆的车身结构
JP2002331959A (ja) 自動車の後部車体構造
CN114056436B (zh) 车辆的前部车身结构
JP3900143B2 (ja) 自動車のピラー構造
JP7376853B2 (ja) 車両の前部車体構造
CN114056433B (zh) 车辆的下部车身结构
US20230311995A1 (en) Rear part structure of vehicle body
US20230311798A1 (en) Vehicle body rear structure
US20240034141A1 (en) Vehicle body rear structure

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 22935646

Country of ref document: EP

Kind code of ref document: A1

DPE1 Request for preliminary examination filed after expiration of 19th month from priority date (pct application filed from 20040101)