JP6057294B2 - Auto body structure - Google Patents

Description

  The present invention relates to a vehicle body structure of an automobile in which a side sill having a hollow closed cross section made of FRP is connected to an outer end in a vehicle width direction of a floor panel made of FRP, and an energy absorbing member is disposed inside the side sill.

  A car body with a floor panel, rocker (side sill), front pillar lower, dash panel lower, rear pillar, etc. is molded integrally with CFRP, and a wave-shaped energy absorbing member is placed inside the side sill, allowing input to the side sill. A device that absorbs a collision load of a side collision is known from Patent Document 1 below.

Japanese Patent No. 4840072

  By the way, when a columnar object such as a pole standing upright on the road surface collides with the side sill made of CFRP, a concentrated heavy load is input to the outer wall in the vehicle width direction of the side sill, so the CFRP on the outer wall in the vehicle width direction has high strength. Even if it is set, the concentrated heavy load cannot be withstood, and the portion where the columnar object collides may be locally broken. As described above, when the outer wall in the vehicle width direction of the side sill is locally broken, the collision energy cannot be efficiently transmitted to a wide range of the energy absorbing member inside the side sill, and the inner wall in the vehicle width direction of the energy absorbing member or the side sill. There is also a possibility that the columnar object may fit into the floor panel due to local breakage.

  This invention is made | formed in view of the above-mentioned situation, and it aims at improving energy absorption performance when a columnar object collides with the side sill of a motor vehicle.

In order to achieve the above object, according to the invention described in claim 1, a side sill having a hollow closed cross section made of FRP is connected to the outer end of the floor panel made of FRP in the vehicle width direction, and energy is stored inside the side sill. A vehicle body structure in which an absorbing member is disposed, wherein a load transmitting member made of a metal hollow closed cross section extending in the front-rear direction is disposed on the outer surface of the side sill in the vehicle width direction , and inside a door positioned above the side sill. A vehicle body structure is proposed in which the lower end of the arranged door beam is overlapped with the load transmission member in a side view .

  According to a second aspect of the present invention, in addition to the configuration of the first aspect, the load transmitting member includes a horizontal wall connecting the outer wall in the vehicle width direction and the inner wall in the vehicle width direction. A vehicle body structure is proposed.

  According to the invention described in claim 3, in addition to the structure of claim 2, the inside of the side sill is partitioned into an upper space and a lower space by a horizontal partition, and the horizontal wall is higher than the partition. A vehicle body structure is proposed that is aligned in the vertical direction.

  According to a fourth aspect of the present invention, in addition to the configuration of the third aspect, the energy absorbing member is a corrugated plate member disposed in each of the upper space and the lower space. A vehicle body structure is proposed.

According to the invention described in claim 5, in addition to the configuration of any one of claims 1 to 4, the load transmitting member is arranged over the entire length of the side sill, A vehicle body structure is proposed in which the outer wall in the vehicle width direction of the load transmitting member is covered with a center pillar lower made of cast aluminum that forms at least the lower part .

  The upper energy absorbing member 25 and the lower energy absorbing member 26 of the embodiment correspond to the energy absorbing member of the present invention, and the front door 31 and the rear door 33 of the embodiment correspond to the door of the present invention.

According to the structure of Claim 1, the side sill of the hollow closed cross section made of FRP is connected to the vehicle width direction outer end of the floor panel made of FRP, and the energy absorbing member is arranged inside the side sill. Since a metal hollow closed cross-section load transmission member extending in the front-rear direction is arranged on the outer surface of the side sill in the vehicle width direction, even if a local collision load is input to the load transmission member due to a side collision with a pillar, When the load transmitting member has bending deformation, the collision load can be transmitted to a wide range in the front-rear direction of the side sill to efficiently absorb energy. Moreover, the lower end of the door beam placed inside the door located above the side sill is overlapped with the load transmission member in side view, so that the collision load of the side collision input to the door is transmitted to the load transmission member via the door beam. By doing so, the movement of the door into the vehicle interior can be prevented.

  According to the second aspect of the present invention, since the load transmitting member includes a horizontal wall that connects the outer wall in the vehicle width direction and the inner wall in the vehicle width direction, the strength of the load transmitting member is increased and the collision load is more efficiently converted into the side sill. Can communicate.

  According to the third aspect of the present invention, the interior of the side sill is partitioned into an upper space and a lower space by a horizontal partition, and the horizontal wall is aligned with the partition in the height direction. It is possible to transmit a large impact load to the side sill more efficiently.

  According to the configuration of claim 4, the energy absorbing member is composed of a corrugated plate member disposed in each of the upper space and the lower space. Therefore, the corrugated plate member is crushed by a collision load and has a large energy absorbing effect. Can be demonstrated.

According to the fifth aspect of the present invention, the load transmission member is disposed over the entire length of the side sill, and the outer pillar in the vehicle width direction of the load transmission member is covered with the center pillar lower made of cast aluminum that constitutes at least the lower part of the center pillar. Therefore, it is possible to prevent the center pillar from moving into the vehicle interior by transmitting the collision load of the side collision input to the lower part of the center pillar to the load transmitting member via the high-strength center pillar lower .

The top view of the automobile body made from CFRP. FIG. FIG. 3 is a sectional view taken along line 3-3 in FIG. 1. FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. FIG. Action explanatory drawing at the time of a side collision with a columnar thing.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. In the present specification, the front-rear direction, the left-right direction (vehicle width direction), and the up-down direction are defined with reference to an occupant seated in the driver's seat.

  As shown in FIGS. 1 and 2, a bathtub-like cabin 11 integrally formed of CFRP (carbon fiber reinforced resin) includes a floor panel 12 and left and right sides extending in the front-rear direction along the left and right sides of the floor panel 12. A pair of side sills 13, 13, a pair of left and right front pillar lowers 14, 14 rising from the front ends of the left and right side sills 13, 13, and a dash connecting the front end of the floor panel 12 and the front ends of the left and right front pillar lowers 14, 14. The panel lower 15, the floor tunnel 16 extending rearward from the rear surface of the dash panel lower 15 in the vehicle width direction center portion of the floor panel 12, and the pair of left and right center pillars 17 rising from the middle portion in the front-rear direction of the left and right side sills 13, 13. , 17 and a pair of left and right rear pillars 18, 1 standing from the rear ends of the left and right side sills 13, 13. A pair of left and right front pillar uppers 19, 19 extending rearward and upward from the upper ends of the left and right front pillar lowers 14, 14, and rearwardly extending from the rear ends of the left and right front pillar uppers 19, 19, The roof side rails 20 and 20 are connected to the upper ends of the left and right rear pillars 18 and 18 through the upper ends of 17.

  As shown in FIGS. 3 to 5, the cabin 11 has joint flanges 21 a and 22 a (see FIG. 4) in which an outer skin 21 located outside the vehicle body and an inner skin 22 located inside the vehicle body are formed on the outer periphery thereof. The floor panel 12 and the dash panel lower 15 are each provided with a corrugated core material 23 sandwiched between an outer skin 21 and an inner skin 22.

  The side sill 13 includes a lower wall 13a formed of an outer skin 21, a side wall 13b formed of an inner skin 22, an upper wall 13c, and a side wall 13d. The side sill 13 is made of CFRP and connects the pair of side walls 13b and 13 together. The upper and lower partitions 24 partition the top and bottom. In the space above the partition wall 24 of the side sill 13, an upper energy absorbing member 25 made of CFRP that is bent zigzag in a side view is disposed, and in the space below the partition wall 24 of the side sill 13 in a side view. A CFRP lower energy absorbing member 26 bent in a zigzag manner is disposed. The upper end of the upper energy absorbing member 25 is connected to the lower surface of the upper wall 13 c of the side sill 13, and the lower end is connected to the upper surface of the partition wall 24. The upper end of the lower energy absorbing member 26 is connected to the lower surface of the partition wall 24, and the lower end is connected to the upper surface of the lower wall 13 a of the side sill 13.

  A reinforcing member 27 made of a metal pipe having a trapezoidal cross section is disposed below the partition wall 24 of the side sill 13 and connected to the floor panel 12 so as to be sandwiched between the outer skin 21 and the inner skin 22. A load transmitting member 28 made of a metal such as aluminum is fixed to the side wall 13d of the side sill 13 in the vehicle width direction by adhesion. The load transmitting member 28 is disposed over the entire length of the side sill 13, and is arranged in the vehicle width direction inside a rectangular cross section composed of an upper wall 28a, a lower wall 28b, a vehicle width direction outer wall 28c, and a vehicle width direction inner wall 28d. It has a letter-shaped cross section in which a horizontal wall 28e that connects the outer wall 28c and the vehicle width direction inner wall 28d in the horizontal direction is disposed. The horizontal wall 28e extending in the horizontal direction of the load transmitting member 28 is arranged so as to be aligned at the same height as the partition wall 24 extending in the horizontal direction of the side sill 13.

  The center pillar 17 includes a center pillar upper 29 made of CFRP and a center pillar lower 30 made of cast aluminum. The left and right center pillar uppers 29 and 29 and the roof arch 35 are integrally formed in an inverted U shape. The center pillar lower 30 includes a plurality of reinforcing ribs 30a extending in the horizontal direction in a recess opened toward the inner side in the vehicle width direction, and a side sill fitting portion 30b having an inverted U-shaped cross section at the lower end thereof, and an inverted L A load transmission member fitting portion 30c having a letter-shaped cross section, and the side sill fitting portion 30b is fitted and bonded to the upper wall 13c of the side sill 13 and the upper portions of both side walls 13b and 13d, and is fitted to the load transmission member. The center pillar lower 30 is firmly connected to the side sill 13 by fitting and bonding the portion 30c to the upper wall 28a and the vehicle width direction outer wall 28c of the load transmitting member 28.

  As shown in FIG. 2, the front door 31 is disposed in the door opening surrounded by the front half of the side sill 13, the front pillar lower 14, the front pillar upper 19, the front half of the roof side rail 20, and the center pillar 17, The door beam 32 attached to the front door 31 in the front-down direction has a front end overlapping the front end of the load transmitting member 28 and a rear end overlapping the center pillar lower 30 in a side view. A rear door 33 is disposed in a door opening surrounded by the rear half of the side sill 13, the rear pillar 18, the rear half of the roof side rail 20, and the center pillar 17. In the side view, the rear end overlaps with the rear end of the load transmitting member 28, and the front end overlaps with the center pillar lower 30.

  Next, the operation of the embodiment of the present invention having the above configuration will be described.

  When the collision load of the side collision is input to the side sill 13, the upper energy absorbing member 25 and the lower energy absorbing member 26 disposed inside the side sill 13 are crushed and a part of the collision energy is absorbed, and the remainder of the collision energy is the side sill. 13 is dispersed and absorbed in the floor panel 12. However, as shown as a comparative example in FIG. 6 (B), when a intensive collision load is input to the side sill 13 due to a side collision with a columnar object 36 such as a pole, a utility pole, or a standing tree, the ductility is low. Since the CFRP side sill 13 is locally crushed, the collision load cannot be distributed to the upper energy absorbing member 25 and the lower energy absorbing member 26, and the side sill 13 breaks at once and the columnar object 36 is fitted into the vehicle interior. there's a possibility that.

  However, as shown in FIG. 6A as an embodiment, the load transmission member 28 made of a metal such as aluminum having higher ductility than the CFRP is disposed along the side wall 13d on the outer side in the vehicle width direction of the side sill 13. The load transmitting member 28 is deformed in an arc shape toward the inner side in the vehicle width direction due to a side collision with the columnar object 36, and the upper energy absorbing member 25 and the lower energy absorbing member 26 of the side sill 13 pushed by the load transmitting member 28 are Crush over a wide area. Thereby, collision energy can be absorbed efficiently, complete destruction of the side sill 13 can be prevented, and the columnar object 36 can be prevented from being fitted into the vehicle interior.

  Further, the load transmitting member 28 is a hollow closed cross-section member that includes a horizontal wall 28e that connects the vehicle width direction outer wall 28c and the vehicle width direction inner wall 28d. In addition to being able to efficiently transmit to the side sill 13, the horizontal wall 28e of the load transmitting member 28 is aligned in the height direction with the horizontal partition wall 24 that divides the interior of the side sill 13 into an upper space and a lower space. The local collision load input to the load transmitting member 28 can be transmitted to the side sill 13 more efficiently.

  Moreover, since the upper energy absorbing member 25 and the lower energy absorbing member 26 of the side sill 13 are formed of corrugated plate members respectively disposed in the upper space and the lower space partitioned by the partition wall 24, the corrugated plate members are caused by a collision load. Can exhibit a large energy absorption effect.

  Further, the load transmission member 28 is disposed over the entire length of the side sill 13 and covers the outer wall 28c in the vehicle width direction of the load transmission member 28 with a center pillar lower 30 made of cast aluminum that forms the lower part of the center pillar 17 (FIG. 4). Reference), by transmitting the collision load of the side collision input to the lower part of the center pillar 17 to the load transmission member 28 via the high-strength center pillar lower 30, the movement of the center pillar 17 into the vehicle interior is prevented. Can do.

  One end side of the door beams 32 and 34 disposed inside the front door 31 and the rear door 33 located above the side sill 13 is overlapped with the load transmission member 28 in a side view, and the other end side is a center pillar lower in a side view. 30, the collision load of the side collision input to the front door 31 and the rear door 33 is transmitted to the load transmission member 28 and the center pillar lower 30 via the door beams 32 and 34, so that the front door 31 and the rear door 33 can be prevented from moving into the passenger compartment.

  The embodiments of the present invention have been described above, but various design changes can be made without departing from the scope of the present invention.

  For example, the FRP of the present invention is not limited to the CFRP of the embodiment, and may be another type of FRP such as GFRP (glass fiber reinforced resin).

  Further, the energy absorbing member of the present invention is not limited to the corrugated plate-like upper energy absorbing member 25 and lower energy absorbing member 26 of the embodiment, and may be of any structure such as a honeycomb material. It need not be divided into two parts.

  The material of the load transmission member 28 is not limited to aluminum, and may be other types of metals such as iron.

12 Floor panel 13 Side sill 17 Center pillar 24 Bulkhead 25 Upper energy absorbing member (energy absorbing member)
26 Lower energy absorbing member (energy absorbing member)
28 Load transmission member 28c Vehicle width direction outer wall 28d Vehicle width direction inner wall 28e Horizontal wall 30 Center pillar lower 31 Front door (door)
32 Door beam 33 Rear door (door)
34 Door beam

Claims (5)

A vehicle in which a side sill (13) having a hollow closed cross section made of FRP is connected to an outer end in the vehicle width direction of a floor panel (12) made of FRP, and an energy absorbing member (25, 26) is arranged inside the side sill (13). Body structure,
Inside the door (31, 33) located above the side sill (13) is a metal hollow closed cross-section load transmission member (28) extending in the front-rear direction on the outer surface of the side sill (13) in the vehicle width direction. A vehicle body structure for an automobile characterized in that the lower end of the door beam (32, 34) disposed on the vehicle is overlapped with the load transmission member (28) in a side view .   The vehicle body structure according to claim 1, wherein the load transmission member (28) includes a horizontal wall (28e) connecting the outer wall (28c) in the vehicle width direction and the inner wall (28d) in the vehicle width direction. .   The side sill (13) is divided into an upper space and a lower space by a horizontal partition wall (24), and the horizontal wall (28e) is aligned with the partition wall (24) in a height direction. The vehicle body structure according to claim 2.   The vehicle body structure according to claim 3, wherein the energy absorbing members (25, 26) are corrugated plate-like members respectively disposed in the upper space and the lower space. The load transmission member (28) is disposed over the entire length of the side sill (13), and the load transmission member (28) is a center pillar lower (30) made of cast aluminum that constitutes at least the lower part of the center pillar (17). The vehicle body structure according to any one of claims 1 to 4, wherein the outer wall (28c) in the vehicle width direction is covered .

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