WO2015049988A1 - Structure de plancher inférieur de véhicule - Google Patents

Structure de plancher inférieur de véhicule Download PDF

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Publication number
WO2015049988A1
WO2015049988A1 PCT/JP2014/074605 JP2014074605W WO2015049988A1 WO 2015049988 A1 WO2015049988 A1 WO 2015049988A1 JP 2014074605 W JP2014074605 W JP 2014074605W WO 2015049988 A1 WO2015049988 A1 WO 2015049988A1
Authority
WO
WIPO (PCT)
Prior art keywords
vehicle
inclined surface
main body
cover main
surface portion
Prior art date
Application number
PCT/JP2014/074605
Other languages
English (en)
Inventor
Keita Ito
Masahiro Ishikawa
Yutaka Yamada
Masato Kanbe
Original Assignee
Toyota Jidosha Kabushiki Kaisha
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 Toyota Jidosha Kabushiki Kaisha filed Critical Toyota Jidosha Kabushiki Kaisha
Publication of WO2015049988A1 publication Critical patent/WO2015049988A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D35/00—Vehicle bodies characterised by streamlining
    • B62D35/02—Streamlining the undersurfaces
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
    • Y02T10/82—Elements for improving aerodynamics
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
    • Y02T10/88—Optimized components or subsystems, e.g. lighting, actively controlled glasses

Definitions

  • the present invention relates to a vehicle underfloor structure.
  • an object of the present invention is to obtain a vehicle underfloor structure that can realize both ensuring of the flow adjusting effect on the airflow that flows at the vehicle lower side of a vehicle body floor and ensuring of space at the vehicle lower side of the vehicle body floor.
  • a vehicle underfloor structure relating to a first aspect of the present invention comprises: a vehicle body floor; an undercover having, at a vehicle vertical direction lower side of the vehicle body floor and at a predetermined interval from the vehicle body floor, a cover main body portion that extends in a vehicle transverse direction and a vehicle longitudinal direction; and an inclined portion that is provided integrally from a vehicle longitudinal direction front side end portion of the cover main body portion, and that is formed in a shape that is convex toward a vehicle lower front side, and that is structured to include a plurality of inclined surface portions that are inclined from a vehicle upper front side toward a vehicle lower rear side.
  • a supplementary angle of an angle formed by the cover main body portion and one inclined surface portion that is adjacent to the cover main body portion, and a supplementary angle of an angle formed by the one inclined surface portion and an inclined surface portion that is adjacent at a vehicle front side of the one inclined surface portion are each smaller than 45°.
  • the inclined portion is structured by three of the inclined surface portions.
  • the undercover in the invention relating to any one of the first through third aspects, can be disposed at a predetermined interval from a tire, that is disposed at a vehicle longitudinal direction front side of the inclined portion, such that a vehicle part can be disposed between the inclined portion and the tire.
  • the cover main body portion extends in the vehicle transverse direction and the vehicle longitudinal direction, at the vehicle vertical direction lower side of the vehicle body floor at a predetermined interval from the vehicle body floor. Therefore, a space is formed between the undercover and the vehicle body floor, and various members can be placed in this space.
  • the inclined portion that is formed in a shape that is convex toward the vehicle lower front side, is provided integrally with the cover main body portion from the vehicle longitudinal direction front side end portion of the cover main body portion.
  • This inclined portion is structured to include plural inclined surface portions that are inclined from the vehicle upper front side toward the vehicle lower rear side. Therefore, a space can be sufficiently ensured between the undercover and the vehicle body floor, and airflow, that flows from the vehicle front side, can be adjusted in a direction along the inclined portion, and this airflow can be made to flow along the cover main body portion.
  • the supplementary angle of the angle formed by the cover main body portion and the inclined surface portion that is adjacent to the cover main body portion, and the supplementary angle of the angle formed by an inclined surface portion and the inclined surface portion that is adjacent at the vehicle front side of the aforementioned inclined surface portion are set to angles that are smaller than 45°. Due thereto, of the velocity components of the airflow that flows along an inclined surface portion, the proportion of the velocity component, in the direction along the cover main body portion or the inclined surface portion that is adjacent at the vehicle rear side of that inclined surface portion, can be made to be large.
  • the inclined portion is structured by three inclined surface portions. Due thereto, the direction of the flow of the airflow, that flows along the inclined portion, can be changed gradually.
  • the undercover can be disposed at a predetermined interval such that a vehicle part can be disposed between the inclined portion and a tire that is disposed at the vehicle longitudinal direction front side of the inclined portion. Due thereto, a vehicle part can be disposed between the inclined portion and the tire that is disposed at the vehicle longitudinal direction front side of the inclined portion.
  • the vehicle underfloor structure relating to the first aspect of the present invention has the excellent effect that ensuring of the flow adjusting effect on the airflow that flows at the vehicle lower side of the vehicle body floor, and ensuring of a space at the vehicle lower side of the vehicle body floor, can both be realized.
  • the vehicle underfloor structure relating to the second aspect of the present invention has the excellent effect that separation of the airflows that flow along the inclined surface portions and the cover main body portion can be suppressed or prevented.
  • the vehicle underfloor structure relating to the third aspect of the present invention has the excellent effect that the airflow that flows along the inclined portion can be merged gently with the airflow that flows at the vehicle lower side of the undercover, and an increase in traveling resistance (air resistance) due to disturbance of this airflow can be suppressed or prevented.
  • the vehicle underfloor structure relating to the fourth aspect of the present invention has the excellent effect that the space formed between the inclined portion and a tire, that is disposed at the vehicle longitudinal direction front side of the inclined portion, can be utilized effectively.
  • Fig. 1 is an enlarged sectional view showing main portions of a vehicle underfloor structure relating to a first embodiment (an enlarged sectional view showing main portions of Fig. 2).
  • Fig. 2 is an enlarged sectional view showing the vehicle underfloor structure relating to the first embodiment (an enlarged sectional view showing a state cut along line 2-2 of Fig. 4).
  • Fig. 3 is a perspective view showing the vehicle underfloor structure relating to the first embodiment.
  • Fig. 4 is a bottom view that is seen from a vehicle lower side and shows the vehicle
  • underfloor structure relating to the first embodiment.
  • Fig. 5 is an enlarged sectional view showing main portions of a vehicle underfloor structure relating to a second embodiment.
  • Fig. 6 is a cross-sectional view showing a modified example of the vehicle underfloor structure relating to the second embodiment.
  • FIG. 1 A first embodiment of a vehicle underfloor structure relating to the present invention is described hereinafter by using Fig. 1 through Fig. 4.
  • arrow FR that is shown appropriately in these drawings indicates the vehicle front side
  • arrow UP indicates the vehicle upper side
  • arrow OUT indicates the vehicle transverse direction outer side.
  • rockers 14 that structure portions of a vehicle body skeleton, extend along the vehicle longitudinal direction at the vehicle transverse direction both end portions of a vehicle body 12.
  • the rocker 14 is made into a closed cross-sectional structure that has a rectangular cross-section, by an outer panel 16 that structures the vehicle transverse direction outer side of the rocker 14, and an inner panel 18 that structures the vehicle transverse direction inner side of the rocker 14. Note that, in Fig. 3, that rockers 14 are illustrated in a simplified manner.
  • a floor panel 22 extends in the vehicle longitudinal direction between the left and right rockers 14, and a vehicle body floor 20 of the vehicle body 12 is structured by this floor panel 22.
  • the floor panel 22 is structured by a plate material that is rectangular in plan view, and the vehicle transverse direction both end portions of this floor panel 22 are bent and made into flange portions 22A.
  • the floor panel 22 is fixed to the rockers 14 due to the flange portions 22 A being joined by spot welding or the like to the vehicle lower sides of the inner panels 18. Note that front tires 24 are disposed at the vehicle front sides of the rockers 14, and rear tires 26 are disposed at the vehicle rear sides of the rockers 14.
  • An energy absorbing member 28 is provided at the vehicle lower side of the rocker 14.
  • This energy absorbing member 28 is formed in a rectangular parallelepiped shape that extends in the vehicle longitudinal direction by extrusion molding an aluminum material, and can absorb collision energy at the time of a side collision. Note that the energy absorbing member 28 is mounted by unillustrated bolts or the like to the surface at the vehicle lower side of the rocker 14.
  • the vehicle underfloor structure is structured to include an undercover 30.
  • the vehicle lower sides of the floor panel 22 and the energy absorbing members 28 are covered by the undercover 30.
  • the structure of the vehicle undercover structure, that centers on the undercover 30 that is a main portion of the present invention, is described in detail.
  • the undercover 30 is formed to integrally include a cover main body portion 32, a front cover portion 36, and inclined portions 38.
  • the cover main body portion 32 is formed in the shape of a rectangular plate that extends in the vehicle transverse direction and the vehicle longitudinal direction as seen in plan view, and is disposed at the vehicle lower sides of the energy absorbing members 28 in a horizontal state with respect to the vehicle body floor 20. Namely, the cover main body portion 32 is disposed at the vehicle lower side of the vehicle body floor 20 with a predetermined interval between the cover main body portion 32 and the vehicle body floor 20, and a space 62 is formed by this cover main body portion 32 and the vehicle body floor 20.
  • the vehicle rear side end portion of the cover main body portion 32 is disposed so as to be offset, by a predetermined distance toward the vehicle rear side, from the vehicle rear side end portions of the energy absorbing members 28.
  • the vehicle transverse direction both end portions of the cover main body portion 32 are disposed so as to be offset, by a predetermined distance toward the vehicle transverse direction inner side, from the vehicle transverse direction outer side end portions of the energy absorbing members 28.
  • the vehicle transverse direction outer sides of the energy absorbing members 28 are in a state of being exposed as seen from the vehicle lower side.
  • the cover main body portion 32 is set so as to be in a state of being close to a road surface 54 at the time when the vehicle travels.
  • the front cover portion 36 is provided integrally with the cover main body portion 32 from the vehicle transverse direction central portion of an end portion 32A at the vehicle longitudinal direction front side of the cover main body portion 32.
  • This front cover portion 36 is structured in a U-shape whose vehicle upper side is open as seen in a longitudinal sectional view, by a lower wall portion 36A that faces the vehicle lower side and a pair of side wall portions 36B that face the vehicle transverse direction outer sides.
  • the lower wall portion 36A is formed in the shape of a trapezoidal plate as seen in plan view, and more concretely, is formed in the shape of a trapezoidal plate whose side at the upper side is made to be the vehicle front side and that is set so as to be symmetrical with respect to the vehicle transverse direction center of the cover main body portion 32.
  • This lower wall portion 36A is provided at the end portion 32 A at the vehicle longitudinal direction front side of the cover main body portion 32, in a state of being inclined from the vehicle upper front side toward the vehicle lower rear side.
  • the side wall portions 36B are provided at the vehicle transverse direction outer side both end portions of the lower wall portion 36A along these end portions so as to be substantially V-shaped as seen in plan view.
  • the vehicle front side end portions are set so as to run along the vehicle vertical direction
  • the vehicle upper side end portions are set so as to run along the vehicle body floor 20
  • the side wall portions 36B are formed in quadrangular plate shapes that extend toward the vehicle lower rear side as seen in side view.
  • the inclined portions 38 are provided at the vehicle transverse direction outer sides of the side wall portions 36B. Note that, as shown in Fig. 2, mounting holes 34, that are shaped as cylindrical tubes having covers and whose vehicle lower sides are open, are provided at plural places of the front cover portion 36 and the cover main body portion 32, and unillustrated insert-through holes are provided in the centers of cover portions 34A of these mounting portions 34.
  • an unillustrated reinforcing member is provided at the vehicle lower side of the vehicle body floor 20, and unillustrated screw holes, that correspond to the insert-through holes of the cover portions 34A, are provided in this reinforcing member and the energy absorbing members 28. Further, fastening members, such as unillustrated screws or the like, are inserted-through these insert-through holes from the vehicle lower side, and, due to the fastening members being screwed-together with these screw holes, the undercover 30 is fixed to the vehicle lower side of the vehicle body floor 20.
  • the inclined portions 38 are provided integrally with the cover main body portion 32 from the vehicle transverse direction outer side portions of the end portion 32A at the vehicle longitudinal direction front side of the cover main body portion 32.
  • the inclined portion 38 is formed in a shape that is convex toward the vehicle lower front side by an inclined surface portion 40, an inclined surface portion 42, and an inclined surface portion 44 that are inclined from the vehicle upper front side toward the vehicle lower front side and are formed in rectangular plate shapes, respectively.
  • the inclined surface portion 40 is disposed adjacent to the cover main body portion 32 at the end portion 32 A of the cover main body portion 32, and the supplementary angle of the angle formed by the inclined surface portion 40 and the cover main body portion 32 is set to ⁇ 1; and the width of the inclined surface portion 40 as seen in side view is set to Li.
  • the inflection portion (the end portion 32A) of this inclined surface portion 40 and the cover main body portion 32 is set so as to be further toward the vehicle rear side than the vehicle front side end portion of the energy absorbing member 28.
  • the inclined surface portion 40 is disposed such that this inclined surface portion 40 and the front side of the energy absorbing member 28 overlap as seen from the vehicle lower side.
  • the inclined surface portion 42 is disposed adjacent to the inclined surface portion 40 at the vehicle front side end portion of the inclined surface portion 40, and the supplementary angle of the angle formed by the inclined surface portion 42 and the inclined surface portion 40 is set to ⁇ 2 , and the width of the inclined surface portion 42 as seen in side view is set to L 2 .
  • the inclined surface portion 44 is disposed adjacent to the inclined surface portion 42 at the vehicle front side end portion of the inclined surface portion 42, and the supplementary angle of the angle formed by the inclined surface portion 44 and the inclined surface portion 42 is set to ⁇ 3 , and the width of the inclined surface portion 44 as seen in side view is set to L 3 . Further, the angle of inclination of the inclined surface portion 44 with respect to the vehicle vertical direction is set to ⁇ 4 .
  • the ratio of Ly, L 2 and L 3 is set to Lf.L 2 :L 3 - 1 :2:2, or in other words, Li is set to a short length as compared with L 2 and L 3 .
  • a predetermined interval D is ensured between the inclined surface portion 38 and the front tire 24, and a predetermined length of the rocker 14 is exposed as seen from the vehicle lower side (hereinafter, this portion is called the "exposed portion 14A").
  • a jack-up point 46 is set at the exposed portion 14 A, and this jack-up point 46 is exposed from the vehicle lower side.
  • the cover main body portion 32 extends in the vehicle transverse direction and the vehicle longitudinal direction, at the vehicle lower side of the vehicle body floor 20 and with a predetermined interval between the cover main body portion 32 and the vehicle body floor 20. Therefore, the space 62 is formed between the under cover 30 and the vehicle body floor 20, and the energy absorbing members 28 can be disposed in this space 62.
  • the inclined portion 38 is formed, by the plural inclined surface portions, in a shape that is convex toward the vehicle lower front side. If the inclined portion 38 were to be structured by a single inclined surface portion, there would be cases in which the space at the vehicle lower side of the vehicle body floor 20 would not be able to be utilized effectively. To describe this more concretely, in a case in which the inclined portion 38 were to be structured by a single inclined surface portion such as imaginary line K shown in Fig. 1, the length in the vehicle longitudinal direction of the energy absorbing member 28 would have to be made to be shorter in order to prevent interference of the vehicle front side end portion of the energy absorbing member 28 with the inclined portion 38.
  • the inclined portions 38 are formed in a shape that is convex toward the vehicle lower front side, by the inclined surface portion 40, the inclined surface portion 42, and the inclined surface portion 44. Due thereto, the space 62 between the undercover 30 and the vehicle body floor 20 can be ensured sufficiently, and accordingly, the space at the vehicle lower side of the vehicle body floor 20 can be utilized effectively.
  • airflow W l5 that flows from the vehicle front side at the vehicle lower side of the vehicle body floor 20, can be adjusted by the undercover 30.
  • the airflow Wj that is adjusted toward the inclined portion 38 flows along the inclined surface portion 40, the inclined surface portion 42 and the inclined surface portion 44 of the inclined portion 38, and is adjusted so as to run along the cover main body portion 32. Further, the airflow is merged with airflow W 2 , that flows in a vicinity of the road surface 54, so as to become a single airflow W 3 , and this airflow W 3 flows along the cover main body portion 32.
  • a flow path 56 is formed by the inclined portion 38, the cover main body portion 32 and the road surface 54.
  • a flow entrance 58 of this flow path 56 is structured to include the vehicle upper side end portion of the inclined surface portion 44 and the road surface 54, and the cross-sectional area of this flow entrance 58 is set to be Ai .
  • a flow exit 60 of the flow path 56 is structured to include the vehicle rear side end portion of the cover main body portion 32 and the road surface 54, and the cross-sectional area of this flow exit 60 is set to be A 2 .
  • the relationship between the cross-sectional area Ai and the cross-sectional area A 2 is set to be Ai > A 2 .
  • the cover main body portion 32 is set in a state of being near the road surface 54 at the time when the vehicle travels, and therefore, the flow velocity V 2 of the airflow W 3 that flows at the vehicle lower side of the cover main body portion 32 can be increased sufficiently. Accordingly, a low pressure (negative pressure) region is formed at the vehicle lower side of the cover main body portion 32 due to
  • the inclined portions 38 that are formed in shapes that are convex toward the vehicle front lower side, are provided integrally with the cover main body portion 32 from the end portion 32A at the vehicle longitudinal direction front side of the cover main body portion 32 of the undercover 30.
  • the inclined portions 38 are structured by the plural inclined surface portions (the inclined surface portions 40, the inclined surface portions 42, and the inclined surface portions 44) that are inclined from the vehicle upper front sides toward the vehicle lower rear sides.
  • the space 62 can be sufficiently ensured between the undercover 30 and the vehicle body floor 20, and the airflow ⁇ that flows from the vehicle front side can be adjusted in directions along the inclined portions 38, and this airflow Wi can be made to flow along the cover main body portion 32.
  • ensuring of the flow adjusting effect on the airflow that flows at the vehicle lower side of the vehicle body floor 20, and ensuring of the space 62 at the vehicle lower side of the vehicle body floor 20, can both be realized.
  • the supplementary angle Q ⁇ of the angle that is formed by the cover main body portion 32 and the inclined surface portion 40 that is adjacent to the cover main body portion 32, is set to an angle that is less than 45°.
  • the supplementary angle ⁇ 2 of the angle that is formed by the inclined surface portion 40 and the inclined surface portion 42 that is adjacent at the vehicle front side of this inclined surface portion 40
  • the supplementary angle ⁇ 3 of the angle that is formed by the inclined surface portion 42 and the inclined surface portion 44 that is adjacent at the vehicle front side of this inclined surface portion 42, are set to angles that are smaller than 45°.
  • the proportion of the velocity component in the direction along the cover main body portion 32 can be made to be large. Further, among the velocity components of the airflow that flows along an inclined surface portion, the proportion of the velocity component in the direction along the inclined surface portion, that is adjacent at the vehicle rear side of the aforementioned inclined surface portion, can be made to be large. As a result, separation of the airflows, that flow along the inclined surface portion 40, the inclined surface portion 42, the inclined surface portion 44 and the cover main body portion 32, can be suppressed or prevented.
  • the inclined portion 38 is structured by the three inclined surface portions (the inclined surface portion 40, the inclined surface portion 42 and the inclined surface portion 44). Due thereto, the direction of the flow of the airflow Wi, that flows along the inclined portion 38, can be changed gradually, and as a result, the airflow Wi that flows along the inclined portion 38 can be merged gently with the airflow W 2 that flows at the vehicle lower side of the undercover 30, and an increase in traveling resistance (air resistance) caused by disturbance of this airflow W 2 can be suppressed or prevented.
  • the undercover 30 can be placed so as to be apart by the predetermined interval D such that vehicle parts can be placed between the inclined portions 38 and the front tires 24 that are disposed at the vehicle longitudinal direction front sides of these inclined portions 38. Due thereto, the jack-up points 46 can be disposed between the inclined portions 38 and the front tires 24 that are disposed at the vehicle longitudinal direction front sides of these inclined portions 38. As a result, the spaces, that are formed between the inclined portions 38 and the front tires 24 that are disposed at the vehicle longitudinal direction front sides of these inclined portions 38, can be utilized effectively.
  • the flow path 56 is formed by the inclined portions 38, the cover main body portion 32 and the road surface 54, and the cover main body portion 32 is set so as to be in a state of being near the road surface 54 at the time when the vehicle travels. Therefore, downforce can be generated at the vehicle 10, and as a result, the ground contacting ability at the time when the vehicle travels, of the front tires 24 and the rear tires 26, can be improved.
  • this second embodiment has features in the point that an inclined portion 80 is structured by two inclined surface portions, and the point that a curved surface portion 86 is provided at the vehicle rear side of the inclined portion 80.
  • the inclined portion 80 in the present embodiment is structured by an inclined surface portion 82 and an inclined surface portion 84 that are basically structured similarly to the inclined surface portions of the first embodiment.
  • the inclined surface portion 82 is disposed adjacent to the cover main body portion 32 at the front end 32A at the vehicle longitudinal direction front side of the cover main body portion 32, and the supplementary angle of the angle formed by this inclined surface portion 82 and the cover main body portion 32 is set to ⁇ 1; and the width of the inclined surface portion 82 as seen in side view is set to St.
  • the curved surface portion 86 that is formed in a circumferential shape that is convex toward the vehicle upper front side, is provided at the vehicle rear side end portion of the inclined surface portion 82, and the cover main body portion 32 is disposed at a position that is a predetermined height higher than the vehicle rear side end portion of the inclined surface portion 82, by an amount corresponding to the amount by which this curved surface portion 86 is provided.
  • the supplementary angle ⁇ ! of the angle formed by the inclined surface portion 82 and the cover main body portion 32, and the supplementary angle ⁇ 2 of the angle formed by the inclined surface portion 84 and the inclined surface portion 82 are 30°, and are set to be large angles as compared with ⁇ through ⁇ 3 in the first embodiment.
  • the inclination angle ⁇ 3 , with respect to the vehicle vertical direction, of the inclined surface portion 84 is set to an angle that is larger than the inclination angle ⁇ 4 , with respect to the vehicle vertical direction, of the inclined surface portion 44 in the first embodiment.
  • the inclined portion 80 can, overall, exhibit a flow adjusting effect that is similar to that of the inclined portion 38 of the first embodiment, and as a result, operation/effects that are similar to those of the above-described first embodiment are obtained in the present embodiment as well.
  • the curved surface portion 86 is provided at the vehicle rear side end portion of the inclined surface portion 82, and this curved surface portion 86 is formed in a circumferential shape that is convex toward the vehicle upper front side. Therefore, the flow path of the airflow Wi, that flows at the vehicle lower side of the undercover 30, is extended by an amount corresponding to the amount over which the airflow flows along the curved surface portion 86, and the flow velocity of this airflow Wi becomes faster. As a result, a low pressure (negative pressure) region is formed at the vehicle lower side of the curved surface portion 86, and downforce can be generated at the vehicle 10.
  • the cover main body portion 32 is disposed so as to be horizontal with respect to the vehicle body floor 20. However, as shown in Fig. 6, the cover main body portion 32 may be disposed in a state in which the inclination angle thereof with respect to the vehicle body floor 20 is set to a.
  • the portion, at the vehicle lower side of the cover main body portion 32, of the flow path 56 enlarges gradually. Therefore, the pressure of the airflow W 3 , that flows at the vehicle lower side of the cover main body portion 32, increases due to Bernoulli's theorem, and the air at the vehicle lower side of the cover main body portion 32 can be pushed-out to the vehicle rear side. As a result, a low pressure (negative pressure) region is formed at the vehicle front side of the cover main body portion, and downforce can be generated at the vehicle 10.
  • the inclination angle ⁇ 3 , with respect to the vehicle vertical direction, of the inclined surface portion 84 becomes larger by an amount corresponding to the amount by which the cover main body portion 32 is inclined with respect to the vehicle body floor 20 (changes from 30° to 30°+a). Due thereto, traveling resistance (air resistance) due to the inclined surface portion 84 can be reduced.
  • the values of ⁇ through ⁇ 4 and Li through L 3 may be changed appropriately within ranges in which the above-described operation/effects are obtained.
  • the cover main body portion 32 is formed in a rectangular plate shape, and is disposed so as to be horizontal with respect to the vehicle body floor 20.
  • a structure that is similar to that of the second embodiment may be applied.
  • the values of ⁇ through ⁇ 3 and Si and S 2 may be changed appropriately within ranges in which the above-described operation/effects are obtained.
  • the jack-up points 46 are in states of being exposed as seen from the vehicle lower side.
  • the jack-up points 46 may be made to be exposed only at times when the jack-up points 46 are used.
  • the jack-up points 46 may be made to be able to be exposed by making the undercover 30 be a moveable structure.
  • the undercover 30 is structured so as to be fixed to the vehicle lower side of the vehicle body floor 20, but there may be a structure in which the position and the angle of this undercover 30 can be changed by an actuator or the like.
  • the shapes of the inclined portion 38 and the inclined portion 80 are not limited to those of the above-described embodiments, and the inclined portion 38 or the inclined portion 80 may be provided over the entire end portion 32A at the vehicle longitudinal direction front side of the cover main body portion 32. Further, the number of inclined surface portions also may be changed appropriately provided that it is within a range in which the above-described operation/effects are obtained. Note that the inclined portion
  • the inclined portion 38 and the inclined portion 80 have a flow adjusting effect even if the length, in the vehicle transverse direction, of the inclined portion 38 or the inclined portion 80 is a short length.

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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)

Abstract

Une structure de plancher inférieur de véhicule comprend : un plancher de caisse de véhicule (22); un revêtement inférieur (30) ayant, au niveau d'un côté inférieur dans la direction verticale du véhicule du plancher de caisse de véhicule (22), et à un intervalle prédéterminé par rapport au plancher de caisse de véhicule (22), une partie de corps principale de revêtement (32) qui s'étend dans une direction transversale du véhicule et une direction longitudinale du véhicule; et une partie inclinée (38) qui est agencée d'un seul tenant à partir d'une partie d'extrémité de côté avant dans la direction longitudinale du véhicule de la partie de corps principale de revêtement (32), et qui est formée sous une forme qui est convexe vers un côté avant inférieur de véhicule, et qui est structurée de façon à comprendre une pluralité de parties de surface inclinées (40, 42, 44), qui sont inclinées à partir d'un côté avant supérieur de véhicule vers un côté arrière inférieur de véhicule.
PCT/JP2014/074605 2013-10-04 2014-09-08 Structure de plancher inférieur de véhicule WO2015049988A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2013209544A JP5842892B2 (ja) 2013-10-04 2013-10-04 車両床下構造
JP2013-209544 2013-10-04

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WO2015049988A1 true WO2015049988A1 (fr) 2015-04-09

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WO (1) WO2015049988A1 (fr)

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JP7375613B2 (ja) * 2020-03-02 2023-11-08 マツダ株式会社 車両の下部車体構造

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