JP6523390B2 - Energy absorption structure of floor panel - Google Patents

Description

  In the present invention, an energy absorbing member is disposed along the outer end in the vehicle width direction of a floor panel of an automobile, and a vehicle width of a load support frame in which an inner end portion in the vehicle width direction of the energy absorbing member is disposed inside the floor panel. The present invention relates to an energy absorbing structure of a floor panel joined to a direction outer end.

  The outer end of the floor panel of the car body floor made of carbon fiber reinforced resin is made thicker in the vertical direction, and an energy absorbing member made of carbon fiber reinforced resin in the form of a hexagonal column in which the axis is arranged in the vehicle width direction It is known from the following patent document 1 that by collapsing the energy absorbing member in the axial direction (vehicle width direction) at the time of a side collision of an automobile to absorb collision energy.

WO2015 / 129110

  By the way, when the energy absorption member of a hexagonal column crushes in the vehicle width direction by the collision load of a side collision, the above-mentioned conventional one breaks the collision energy by breaking the energy absorption member along the six ridges of the hexagonal column. Although it absorbs, the six surfaces sandwiched by the six ridges of the energy absorbing member are deformed out of plane so as to creep up and can not efficiently absorb the collision energy, and hence sufficient energy absorption There was a possibility that the effect was not exhibited.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to enhance the energy absorbing effect of an energy absorbing member disposed along the outer end in the vehicle width direction of a floor panel.

In order to achieve the above object, according to the invention described in claim 1, an energy absorbing member is disposed along the vehicle width direction outer end of a floor panel of an automobile, and the vehicle width direction inner end of the energy absorbing member Energy absorbing structure of a floor panel joined to an outer end of a load support frame disposed inside the floor panel in the vehicle width direction, wherein the energy absorbing member extends in a flat plate shape in the vehicle width direction and the front and rear direction a plurality of fiber-reinforced resin sheet, formed of a laminate of a plurality of connecting members sandwiched between said plurality of fiber-reinforced resin sheet, said plurality of fiber-reinforced resin sheet, the end positioned in the vertical direction outer end A floor panel energy absorbing structure is proposed which includes a part plate material and an intermediate plate material located in the middle in the vertical direction, and the plate thickness of the end plate material is smaller than the plate thickness of the intermediate plate material.

According to the second aspect of the invention, in addition to the configuration of the first aspect , the connection member and the intermediate member can be obtained by bending the end portions of the upper and lower end plate members in the vehicle width direction and overlapping one another. A floor panel energy absorbing structure characterized in that a plate material is enclosed is proposed .

  According to the configuration of the first aspect, a load supporting frame in which the energy absorbing member is disposed along the vehicle width direction outer end of the floor panel of the automobile, and the vehicle width direction inner end of the energy absorbing member is disposed inside the floor panel. When the collision load of the side collision is input to the energy absorbing member, the energy absorbing member pressed against the load supporting frame is crushed in the vehicle width direction to absorb the collision energy. At this time, the energy absorbing member is formed of a laminate of a plurality of fiber reinforced resin plate members extending in a flat plate shape in the vehicle width direction and the front and rear direction and a plurality of connecting members sandwiched between the plurality of fiber reinforced resin plate members. Thus, the fiber-reinforced resin plate material constrained in the vertical direction by the connecting member fractures the aggregate without out-of-plane deformation and the matrix resin fractures, thereby efficiently absorbing the collision energy. In particular, since the fiber-reinforced resin sheet is flat, it is easy to manufacture and lightweight, and there is no loss of energy absorption effect due to breakage of only the ridge portion as in the conventional hexagonal cross section. The fiber-reinforced resin sheet buckles the entire portion subjected to the load to exhibit a high energy absorption effect.

Also, a plurality of fiber-reinforced resin sheet material, and an end plate positioned vertically outer end, and a middle plate located vertically intermediate, the thickness of the end plate is smaller than the thickness of the intermediate plate Therefore, the plate thickness of the end plate easily susceptible to out-of-plane deformation is reduced because only one side is restrained by the connecting member, and the end plate is buckled before out-of-plane deformation to ensure energy absorption effect. it can.

Further, according to the configuration of the second aspect , the connecting member and the intermediate plate material are enclosed by bending the end portions of the upper and lower end plate members in the vehicle width direction and overlapping each other, so that the bent end plate members Not only is it possible to form the end face of the energy absorbing member and join the energy absorbing member to the load supporting frame easily and firmly, but also to prevent the laminated fiber reinforced resin plate material and the connecting member from peeling off each other The energy absorption effect can be secured .

It is a vehicle width direction sectional view of a floor panel of a car. First Embodiment It is an enlarged view of the energy absorption member of FIG. First Embodiment It is a partial perspective view of an energy absorption member. First Embodiment It is a sectional view of a fiber reinforced resin board material. First Embodiment It is a figure which shows the destruction state of the energy absorption member at the time of a side collision. First Embodiment It is a sectional view of a fiber reinforced resin board material. Second Embodiment It is a perspective view of an energy absorption member and a load support frame. Third Embodiment It is line 8-8 in FIG. 7 sectional drawing. Third Embodiment

First embodiment

  Hereinafter, a first embodiment of the present invention will be described based on FIGS. 1 to 5. In the present specification, the front-rear direction, the left-right direction (vehicle width direction), and the up-down direction are defined based on the occupant seated in the driver's seat.

  FIG. 1 is a cross-sectional view of a left end portion of a vehicle body floor 11 basically made of carbon fiber reinforced resin, cut in the vehicle width direction and viewed from the front, and the floor panel 12 of the vehicle body floor 11 is outside the vehicle ) And the inner skin 14 on the vehicle body inner side (upper side) are bonded by bonding at bonding flanges 13a and 14a obtained by bending the outer ends in the vehicle width direction upward. The floor panel 12 includes a vehicle width direction inner portion 12a having a small thickness in the vertical direction and a vehicle width direction outer portion 12b having a large thickness in the vertical direction. The outer skin 13 and the inner skin 14 are provided on the vehicle width direction inner portion 12a. A pair of upper and lower corrugated plate members 15, 15 sandwiched between them is disposed, and an energy absorbing member 16 for absorbing collision energy of a side collision is disposed in the vehicle width direction outer portion 12b. A load supporting frame 17 extending in the front-rear direction is disposed between the core members 15 and 15 and the energy absorbing member 16 at the boundary between the inner portion 12a and the vehicle width direction outer portion 12b. A side sill 18 having a hollow closed cross section and extending in the front and rear direction is adhered to the upper surface of the vehicle width direction outer portion 12b, and the joint flanges 13a and 14a of the outer skin 13 and the inner skin 14 bent upward are side sills. It is bonded to the 18 vehicle width direction outer surface.

  As shown in FIGS. 2 and 3, the energy absorbing member 16 includes seven fiber reinforced resin plates 19a, 19a, 19b,..., And six sheets between the fiber reinforced resin plates 19a, 19a, 19b,. It is comprised by the laminated body which laminated | stacked board | plate-like connection members 20 ... made from aluminum alloy by adhesion | attachment. The connecting members 20 are ham cam structures in which a large number of short hexagonal columns are continuous in the front-rear direction and the vehicle width direction, and the axes of the hexagonal columns are arranged to face in the vertical direction. The fiber-reinforced resin plates 19a, 19a, 19b,... Are composed of two end plate members 19a, 19a positioned at both ends in the vertical direction and five intermediate plate members 19b positioned at the middle in the vertical direction. The both end portions of the end plate members 19a and 19a in the vehicle width direction are bent in the vertical direction and bonded so as to overlap each other so as to wrap ... and the intermediate plate members 19b.

  As shown in FIG. 4, in the fiber-reinforced resin boards 19a, 19a, 19b,..., UD (uni-direction) in which a large number of carbon continuous fibers 21 are aligned in one direction, the orientation direction of the carbon continuous fibers 21 is alternated. It is a carbon fiber reinforced resin member embedded in the inside of the matrix resin 22 which consists of thermosetting resin and which was laminated | stacked shifting by 90 degrees. The thickness t1 of the end plate 19a is greater than the thickness t2 of the intermediate plate 19b by setting the number of stacked UDs of the end plate 19a to, for example, 3 layers and the number of stacked UDs of the intermediate plate 19b to 6 layers, for example. It is getting smaller. The vertical thickness t3 of the connecting member 20 is set larger than the sum of the thickness t1 of the end plate 19a and the thickness t2 of the intermediate plate 19b, and the sum of the thicknesses t2 of the two intermediate plates 19b. Is also set large.

  The energy absorbing member 16 configured in this way is housed inside the vehicle width direction outer portion 12b of the floor panel 12, and the upper surface, the lower surface and the outer surface of the vehicle width direction are the inner surfaces of the outer skin 13 and the inner skin 14 of the floor panel 12. The end plate members 19a and 19a bent in the vertical direction, which is the inner surface in the vehicle width direction, are bonded to the outer surface in the vehicle width direction of the load support frame 17.

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

  When a car makes a side collision and a collision load is input to the outer end of the energy absorbing member 16 in the vehicle width direction, the energy absorbing member 16 supported on the load support frame 17 at the inner end in the vehicle width buckles to absorb the collision energy . FIG. 5 shows a broken state of the energy absorbing member 16 when a pole 26 such as a utility pole or a standing tree makes a side collision, the energy absorbing member 16 buckles in an arc along the cross sectional shape of the pole 26, and its seat The fiber reinforced resin plate members 19a, 19a, 19b,... And the connecting members 20,.

  At this time, if the fiber-reinforced resin plates 19a, 19a, 19b... Are out-of-plane deformed so as to bend in the vertical direction, sufficient energy absorbing performance can not be obtained because the carbon continuous fibers 21 and the matrix resin 22 are not finely crushed. . However, according to the present embodiment, since the fiber reinforced resin plate members 19a, 19a, 19b ... extending in a flat plate shape in the vehicle width direction and in the front and back direction are sandwiched by the connecting members 20, deformation in the vertical direction is restricted. The portion of the fiber-reinforced resin plates 19a, 19a, 19b,... Receives a load inward in the vehicle width direction, and the portion subjected to the load is reliably buckled inward in the vehicle width direction without any out-of-plane deformation. 21 and the matrix resin 22 are finely crushed to exhibit the maximum energy absorption effect. Moreover, since the fiber-reinforced resin plate members 19a, 19a, 19b... Are formed in a flat plate shape, their manufacture is easy.

  The intermediate plate 19b has upper and lower surfaces bonded to the connecting members 20, 20, but the end plate 19a has a problem that it is easily out-of-plane deformed in the vertical direction since only upper and lower surfaces are bonded to the connecting member 20. . However, according to the present embodiment, since the thickness t1 of the end plate 19a is set smaller than the thickness t2 of the intermediate plate 19b, the out-of-plane deformation is caused because the thickness t1 is small when the collision load is input. The end plate member 19a that is easy to do can be reliably buckled to ensure the energy absorption effect.

  Further, since the connecting members 20 are hollow members having a honeycomb structure which are easily crushed by a collision load in the vehicle width direction, the connecting members 20 do not inhibit the buckling of the fiber reinforced resin plates 19a, 19a, 19b,. Not being absorbed by fragments of the fiber reinforced resin plates 19a, 19a, 19b ... that are buckled in the space of the crushed connecting members 20 ... are pushed by the fragments and the fiber reinforced resin plates 19a, 19a, 19b ... are faces It is possible to prevent external deformation.

  In particular, the thickness t3 of the connecting member 20 in the vertical direction is larger than t1 + t2 or t2 + t2 which is the sum of the plate thicknesses of the two fiber reinforced resin plates 19a, 19a, 19b ... sandwiching it, the fiber reinforced resin plate 19a, The fragments generated by crushing 19a, 19b... Can be reliably absorbed by the connecting members 20.

  Further, the energy absorbing member 16 superposes the bent end portions of the upper and lower end plate members 19a and 19a in the vehicle width direction and wraps the connecting members 20 ... and the intermediate plate members 19b ... The end face of the energy absorbing member 16 can be configured by the bent portion. As a result, the energy absorbing member 16 can be easily and firmly fixed to the load support frame 17, and the energy absorbing member 16 is prevented from being tilted up and down with respect to the vehicle width direction due to the collision load. , 19a, 19b... Can be promoted to further enhance the energy absorption effect. Moreover, since the fiber-reinforced resin plates 19a, 19a, 19b,... And the connecting members 20,... Are firmly integrated, the fiber-reinforced resin plates 19a, 19a, 19b,. It can prevent and make it buckle more certainly.

  Further, since the matrix resin 22 of the fiber reinforced resin plate members 19a, 19a, 19b,... Is a thermosetting resin which is high in hardness and difficult to be deformed compared to a thermoplastic resin, the matrix resin 22 is separated from the carbon continuous fiber 21 by a collision load. The buckling of the fiber-reinforced resin plates 19a, 19a, 19b... Is promoted and the energy absorbing effect is improved. Moreover, since the aggregate of the fiber-reinforced resin plate members 19a, 19a, 19b... Is the carbon continuous fiber 21 having high strength, the fiber-reinforced resin plate members 19a, 19a, 19b. Demonstrate energy absorption effect.

Second embodiment

  Next, a second embodiment of the present invention will be described based on FIG.

  In the first embodiment, the plate thicknesses of the five intermediate plate members 19b are all set to be the same, but in the second embodiment, the plate thicknesses of the intermediate plate members 19b change stepwise. That is, the number of stacked UDs of the five intermediate plate members 19b is as follows: the innermost intermediate plate member 19b is six layers, the outer two intermediate plate members 19b and 19b are five layers, and the outermost two The number of intermediate plate members 19b and 19b is four, and each exceeds three layers, which is the number of layers of UD of the two end plate members 19a and 19a.

  Also in the present embodiment, the fiber reinforced resin sheet 19a is formed by reducing the sheet thickness of the seven fiber reinforced resin sheets 19a, 19a, 19b,... , 19a, 19b,... Can be achieved to enhance the energy absorption effect.

Third embodiment

  Next, a third embodiment of the present invention will be described based on FIGS. 7 and 8. FIG.

  The energy absorbing member 16 of the third embodiment does not wrap the intermediate plate members 19b and the connecting members 20 with the end plate members 19a and 19a, and the end surfaces of the end plate members 19a and 19 are the end surfaces of the intermediate plate members 19b and The end faces of the connecting members 20 are cut in the same plane.

  Both ends in the front-rear direction of the energy absorbing member 16 are vertically sandwiched by a pair of upper and lower L-shaped metal support members 23 and 23 and fastened by a plurality of bolts 24. The pair of support members 23 is fastened to the outer surface in the vehicle width direction of the load support frame 17 by a plurality of bolts 25.

  According to the present embodiment, when a collision load inward in the vehicle width direction is input to the energy absorbing member 16 due to a side collision, the energy absorbing member 16 firmly fixed to the load support frame 17 by the support members 23. Since the fiber-reinforced resin plates 19a, 19a, 19b... Are prevented from being deformed out of plane, the fiber reinforced resin plates 19a, 19a, 19b. Moreover, by using the support members 23, the energy absorbing member 16 can be fixed to the load support frame 17 easily and firmly.

  As mentioned above, although embodiment of this invention was described, this invention can perform various design changes in the range which does not deviate from the summary.

  For example, although fiber reinforced resin board material 19a, 19a, 19b ... of embodiment is made from carbon fiber reinforced resin, it may be made from other kinds of fiber reinforced resin, such as glass fiber reinforced resin.

  The number of laminated layers of the fiber reinforced resin plates 19a, 19a, 19b and so on and the connecting members 20 is not limited to the embodiment, and it is sufficient if at least three layers of fiber reinforced resin plate and at least two layers of connecting members.

  Further, the connecting member of the present invention is not limited to the honeycomb structure of the embodiment.

12 floor panel 16 energy absorption member 17 load support frame 19a fiber reinforced resin plate material, end plate material 19b fiber reinforced resin plate material, intermediate plate material 20 connection member 21 carbon continuous fiber 22 matrix resin 23 support member

Claims (2)

An energy absorbing member (16) is disposed along the vehicle width direction outer end of the floor panel (12) of the automobile, and the vehicle width direction inner end of the energy absorbing member (16) is placed inside the floor panel (12). An energy absorbing structure of a floor panel joined to an outer end in a vehicle width direction of the arranged load support frame (17),
The energy absorbing member (16) is sandwiched between a plurality of fiber reinforced resin plate members (19a, 19b) extending in a flat plate shape in the vehicle width direction and the front and rear direction and the plurality of fiber reinforced resin plate members (19a, 19b) Composed of a laminate of a plurality of connecting members (20) ,
The plurality of fiber reinforced resin plate materials (19a, 19b) include an end plate material (19a) positioned at the outer end in the vertical direction and an intermediate plate material (19b) positioned in the middle in the vertical direction, and the end plate material (19a) The energy absorption structure of a floor panel characterized in that the thickness of) is smaller than the thickness of the intermediate plate (19b) . The connection member (20) and the intermediate plate member (19b) are enclosed by bending the end portions in the vehicle width direction of the upper and lower end plate members (19a) and overlapping each other. The energy absorption structure of the floor panel of item 1 .

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