JP2014054963A - Floor structure of automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance an energy absorbing effect by preventing separation of an energy absorbing member from side sill sections when a floor of an automobile is molded through RTM molding.SOLUTION: A floor 11 of an automobile including side sill sections 13 on both sides in a vehicle width direction of a floor panel section 12 is molded of carbon fiber-reinforced resin through RTM molding. Each of the side sill sections 13 includes a hollow side sill outer fence 25b and an energy absorbing member 26 held in the side sill outer fence 25b. The energy absorbing member 26 has top and bottom surfaces and inside and outside surfaces, which are covered with the side sill outer fence 25b. Therefore, the energy absorbing member 26 is surely collapsed and an energy absorbing effect can be secured by preventing separation of the energy absorbing member 26 from the side sill fence 25b at an input time of collision load, even if mold release agent is contained in resin impregnated in the carbon fiber during RTM molding.

Description

  The present invention relates to an automobile floor structure in which an automobile floor having side sill portions on both sides in the vehicle width direction of a floor panel portion is RTM-molded with carbon fiber reinforced resin.

  In an automobile floor made of carbon fiber reinforced resin, the lower wall of the rocker (side sill) that houses the energy absorbing member and the outer edge of the floor panel in the vehicle width direction are bonded together and the inside of the rocker in the vehicle width direction Japanese Patent Application Laid-Open Publication No. 2004-228561 discloses a method in which the side wall of the cross member and the outer end of the cross member in the vehicle width direction are bonded together.

  An automobile floor cloth (floor panel) is made up of a vertical member made of solid carbon fiber reinforced resin, an EA cloth and a horizontal cloth filled with urethane foam inside a carbon fiber reinforced resin outer shell, A structure sandwiched between sandwich panels is known from Patent Document 2 below.

  In addition, the outer member of the automobile side member (side sill) is configured with a hollow closed cross-section by combining an inner member, an outer member, and a center member formed from a prepreg made of carbon fiber impregnated with resin. Patent Document 3 listed below is known.

  It is known from Patent Document 4 below that a release agent is added to a thermosetting resin used in an RTM (resin transfer molding) method, which is one of the methods for molding a fiber-reinforced thermosetting resin.

Japanese Patent No. 4840072 Japanese Patent No. 4788539 Japanese Patent No. 485315 Japanese Patent Laid-Open No. 5-117346

  By the way, what is described in Patent Document 1 described above is that when a side impact collision load is input to the side sill, the load is applied to the adhesion portion between the side wall of the side sill in the vehicle width direction and the outer end of the cross member in the vehicle width direction. There is a possibility that the side sill collapses inward in the vehicle width direction and the internal energy absorbing member cannot sufficiently exhibit the energy absorbing effect.

  In addition, in the above-mentioned Patent Document 2, there is a difference in rigidity between the portion where the EA cloth and the horizontal cloth including the foamed urethane foam are present and the portion where the floor cloth is not present. May not be distributed efficiently.

  Further, in the above-mentioned Patent Document 3, since the inner member and the outer member constituting the outline of the side sill have joints, the fibers are interrupted at the upper wall and the lower wall of the side sill, and the foamed urethane foam is removed from the side sill. Since it cannot be firmly held inside, the energy absorption effect may be reduced.

  Moreover, when the side sill which accommodates an impact-absorbing member inside is shape | molded by the RTM method, when a mold release agent is added in resin as described in the said patent document 4, the joint part of fibers, fiber, and energy absorption member There is a possibility that the bonding strength of the bonded portion is weakened by the release agent, and when the collision load of the side collision is input to the side sill, the bonded portion is separated and a desired energy absorption effect cannot be obtained.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to enhance the energy absorption effect so that the energy absorbing member does not fall off from the side sill part when an automobile floor is RTM molded.

  In order to achieve the above object, according to the first aspect of the present invention, there is provided a vehicle floor structure in which an automobile floor having side sill portions on both sides in the vehicle width direction of the floor panel portion is RTM molded with carbon fiber reinforced resin. The side sill portion includes a hollow side sill outer shell and an energy absorbing member held inside the side sill outer shell, and the energy absorbing member is covered by the side sill outer shell on the upper and lower surfaces and the inner and outer surfaces in the vehicle width direction. A characteristic automobile floor structure is proposed.

  According to the invention described in claim 2, in addition to the configuration of claim 1, there is provided a vehicle floor structure characterized in that the carbon fiber of the floor panel portion and the carbon fiber of the side sill outline are continuous. Proposed.

  According to the invention described in claim 3, in addition to the configuration of claim 2, the floor panel portion includes a lower floor panel lower wall and an upper floor panel upper wall, and the floor panel lower wall And the carbon fiber of any one of the upper walls of the floor panel is continuous with the carbon fiber of the side sill outer shell, and the side sill outer shell forms an open cross section that opens in the outer wall on the outer side in the vehicle width direction. A structure is proposed.

  According to a fourth aspect of the present invention, in addition to the configuration of the second aspect, the floor panel portion includes a lower floor panel lower wall and an upper floor panel upper wall, and the floor panel lower wall Further, a floor structure of an automobile is proposed in which any one of the carbon fibers of the upper wall of the floor panel is continuous with the carbon fibers of the side sill outline, and the side sill outline forms a closed cross section.

  According to the invention described in claim 5, in addition to the configuration of claim 2, the floor panel portion includes a lower floor panel lower wall and an upper floor panel upper wall, and the floor panel lower wall And the carbon fiber of the floor panel upper wall is continuous with the carbon fiber of the side sill shell, and the end of the carbon fiber of the side sill shell is the other of the floor panel lower wall and the floor panel upper wall. An automobile floor structure is proposed which is connected to the end of carbon fiber.

  According to the invention described in claim 6, in addition to the structure of any one of claims 3 to 5, a floor core is joined between the floor panel lower wall and the floor panel upper wall. A characteristic automobile floor structure is proposed.

  According to the invention described in claim 7, in addition to the structure of any one of claims 1 to 6, a structure in which the energy absorbing member is wrapped in the preform of the side sill outer shell is formed in the mold. An automobile floor structure is proposed which is characterized in that it is set to RTM and molded in RTM.

  According to the configuration of the first aspect, the floor of the automobile including the side sill portions on both sides in the vehicle width direction of the floor panel portion is RTM-molded with the carbon fiber reinforced resin. The side sill portion is composed of a hollow side sill outer shell and an energy absorbing member held inside the side sill outer shell, and the energy absorbing member covers the upper and lower surfaces and the inner and outer surfaces in the vehicle width direction by the side sill outer shell. Even if a release agent is included in the resin to be impregnated, the energy absorbing member is prevented from separating from the side sill shell, so that the energy absorbing member is reliably crushed when a collision load is input to ensure the energy absorbing effect. can do.

  According to the second aspect of the present invention, since the carbon fiber of the floor panel and the carbon fiber of the side sill outline are continuous, the carbon fiber of the floor panel and the carbon fiber of the side sill outline are prevented from being separated. The strength of the floor can be increased.

  According to the third aspect of the present invention, the floor panel portion comprises a lower floor panel lower wall and an upper floor panel upper wall, and the carbon fiber of either the floor panel lower wall or the floor panel upper wall is a side sill. Since it is continuous with the carbon fiber of the outer shell, it is possible to increase the strength of the floor by preventing any one of the carbon fiber of the floor panel lower wall and the floor panel upper wall and the carbon fiber of the side sill shell from being divided. In addition, since the side sill outer shell has an open cross section that opens in the outer wall on the outer side in the vehicle width direction, the area of the outer wall on the outer side in the vehicle width direction of the side sill outer shell, which is difficult to obtain a collision load transmission effect, is reduced by the amount of the opening. be able to.

  According to the fourth aspect of the present invention, the floor panel portion includes a lower floor panel lower wall and an upper floor panel upper wall, and the carbon fiber of either the floor panel lower wall or the floor panel upper wall is a side sill. Since it is continuous with the carbon fiber of the outer shell, it is possible to increase the strength of the floor by preventing any one of the carbon fiber of the floor panel lower wall and the floor panel upper wall and the carbon fiber of the side sill shell from being divided. Moreover, since the side sill outer shell forms a closed cross section, the strength of the side sill outer shell can be increased and the energy absorbing member can be held more firmly.

  According to the fifth aspect of the present invention, the floor panel portion includes a lower floor panel lower wall and an upper floor panel upper wall, and the carbon fiber of either the floor panel lower wall or the floor panel upper wall is a side sill. Since it is continuous with the carbon fiber of the outer shell, it is possible to increase the strength of the floor by preventing any one of the carbon fiber of the floor panel lower wall and the floor panel upper wall and the carbon fiber of the side sill shell from being divided. In addition, since the end of the carbon fiber of the side sill outer wall is connected to the end of the other carbon fiber of the floor panel lower wall and the floor panel upper wall, the structure of the carbon fiber is eliminated by eliminating the bifurcated portion. be able to.

  According to the configuration of claim 6, since the floor core is joined between the floor panel lower wall and the floor panel upper wall, the strength of the floor panel portion can be increased by the floor core and the damage at the time of collision can be reduced.

  According to the seventh aspect of the present invention, since the energy absorption member encased in the preform of the side sill outline is set in the mold and RTM molded, the side sill outline and the energy absorption member are firmly bonded without bonding. It can be integrated to increase productivity.

The perspective view of the floor made from CFRP of a car. The figure which shows the manufacturing process of a floor. FIG. 3 is a sectional view taken along line 3-3 in FIG. 1. Explanatory drawing of RTF method. The figure which shows other embodiment of the structure of an outer skin and an inner skin. The figure which shows other embodiment of the structure of an outer skin and an inner skin. The figure which shows other embodiment of the structure of an energy absorption member. The figure which shows other embodiment of the structure of a side sill core. The figure which shows other embodiment of the structure of an energy absorption member. The figure which shows other embodiment of the shape of an energy absorption member.

First embodiment

  Hereinafter, a first embodiment 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 FIG. 1, an automobile floor 11 basically composed of carbon fiber reinforced resin (CFRP) includes a floor panel portion 12 and a pair of left and right sides extending in the front-rear direction along the left and right edges of the floor panel portion 12. The side sill parts 13 and 13 are connected between the front wall part 14 rising from the front end of the floor panel part 12 and the rear ends of the left and right side sill parts 13 and 13 so as to connect the front ends of the left and right side sill parts 13 and 13. Thus, it has a rear wall portion 15 rising from the rear end of the floor panel portion 12, and is formed in a bathtub shape as a whole. The floor panel portion 12 has a rear portion that is one step higher than the front portion with a kick-up portion 12a extending in the vehicle width direction, and extends in the front-rear direction at the center portion in the vehicle width direction of the front portion. A floor tunnel portion 12b connecting the kick-up portion 12a is formed.

  As shown in FIG. 2, the floor 11 is configured by assembling an outer skin assembly 21, an inner skin assembly 22, a floor core 23, and a plurality of nuts 24. The outer skin assembly 21 constitutes a lower surface of the floor panel portion 12 (floor panel lower wall 25a), an outer shell of the side sill portions 13 and 13 (side sill outer shell 25b), a front surface of the front wall portion 14, a rear surface of the rear wall portion 15, and the like. CFRP outer skin 25, energy absorbing members 26 and 26 housed in side sill shells 25b and 25b of outer skin 25, and a plurality of metal inserts 27. The energy absorbing member 26 is composed of a hollow structure 28 formed into a rectangular hollow closed section with CFRP, and a side sill core 29 made of urethane foam filled in the hollow structure 28 (FIG. 8 ( A)).

  The outer skin 25 is manufactured by the RTM (resin transfer molding) method. That is, as shown in FIG. 4, a preform formed by molding carbon fibers as a reinforcing material for the outer skin 25 into a predetermined shape is set in the cavity between the lower mold 30a and the upper mold 30b of the mold 30, and the inside of the cavity is set. By injecting and heating the resin while evacuating, the CFRP outer skin 25 is integrally formed. At this time, by setting the metal inserts 27 (see FIG. 2) for assembling the vehicle body parts to the floor 11 in the cavity, the metal inserts 27 can be integrated with the outer skin 25.

  The hollow structure 28 of the energy absorbing member 26 is molded by a RTM method using a CFRP preform knitted in a cylindrical shape, and a side sill core 29 made of urethane foam is filled therein. When the outer skin 25 is molded by the RTM method, the energy absorbing member 26 sub-assembled in this way is set in the cavity in a state of being wrapped in the preform of the outer skin 25, so that the outer skin 25 25.

  As shown in FIG. 2, the inner skin assembly 22 includes an inner skin 31 made of CFRP that constitutes the upper surface of the floor panel portion 12 (the floor panel upper wall 31 a, the rear surface of the front wall portion 14, the front surface of the rear wall portion 15, and the like). And the plurality of metal inserts 32. The inner skin 31 is formed by the RTM method in the same manner as the outer skin 25 described above, and the metal inserts 32 are set in the cavity at that time, The metal inserts 32 can be integrated with the inner skin 31.

  The floor core 23 is integrally formed of foamed urethane in the present embodiment, but the material thereof is arbitrary, and it may be an aluminum honeycomb material, or a wave made of CFRP or GFRP (glass fiber reinforced resin). A board etc. may be sufficient.

  And the floor 11 is completed by assembling | attaching the outer skin 25, the inner skin 31, the floor core 23, and several nut 24 ... which incorporated the energy absorption members 26 and 26 by adhesion | attachment.

  As shown in FIG. 3, the outer skin 25 is integrally provided with a floor panel lower wall 25a and a side sill outer wall 25b, and the side sill outer wall 25b extends downward from the outer end in the vehicle width direction of the floor panel lower wall 25a. And an inner wall b extending upward from the outer end in the vehicle width direction of the floor panel lower wall 25a, an upper wall c extending outward in the vehicle width direction from the upper end of the inner wall b, and extending downward from the outer end in the vehicle width direction of the upper wall c. An outer wall d and an outer wall d extending upward from the outer end in the vehicle width direction of the lower wall a are provided and configured to have a rectangular cross section. The two outer walls d, d are divided vertically, and an opening e extending in the front-rear direction is formed between the two outer walls d, d on the outer surface of the side sill outer shell 25b in the vehicle width direction. The hollow structure 28 is exposed. The outer end in the vehicle width direction of the inner skin 31 is connected to the inner surface in the vehicle width direction of the inner wall b of the side sill shell 25b.

  FIG. 3 (A) shows the orientation of the preform fibers of the outer skin 25. Of the fibers f1 and f2 extending in the vehicle width direction of the floor panel lower wall 25a, the fibers f1 are formed on the bottom wall a of the side sill shell 25b. It extends outward in the vehicle width direction, and further extends downward on the outer wall d. Further, the fiber f2 extends upward on the inner wall b of the side sill outer shell 25b, and further extends the upper wall c and the upper outer wall d outward and downward in the vehicle width direction.

  FIG. 3B shows another example of the fiber orientation of the preform of the outer skin 25, and the added fiber f3 is an outer wall d, a lower wall a, an inner wall b, and an upper wall on the lower side of the side sill shell 25b. c and the upper outer wall d. Thereby, the strength of the side sill portion 13 of the floor 11 can be further increased.

  As described above, according to the present embodiment, the side sill portion 13 of the floor 11 includes the hollow side sill outer shell 25b and the energy absorbing member 26 held therein, and the energy absorbing member 26 is formed by the side sill outer shell 25b. Since the upper and lower surfaces and the inner and outer surfaces in the vehicle width direction are covered, even if the resin impregnated into the carbon fiber during RTM molding contains a release agent and the adhesion between the side sill shell 31b and the energy absorbing member 26 is weakened, It is possible to prevent the energy absorbing member 26 from being separated from the side sill shell 25b when a collision load is input, and to surely crush the energy absorbing member 26 to ensure the energy absorbing effect.

  Further, since the fibers f1 and f2 of the preform are continuous at the connecting portion between the floor panel lower wall 25a of the outer skin 25 and the side sill outline 25b, the floor panel portion 12 and the side sill portion 13 are firmly integrated. The strength of the floor 11 can be increased. Moreover, since the side sill shell 25b has an opening e between the outer walls d, d on the outer side in the vehicle width direction, the area of the outer walls d, d, where it is difficult to obtain a collision load transmission effect, is reduced by the amount of the opening e to reduce weight. Can do.

Other embodiments

  The present invention has a number of embodiments in addition to the first embodiment described above, and these embodiments will be described in order below.

  FIG. 5 shows another embodiment of the outer skin 25 and the inner skin 31.

  FIG. 5A corresponds to the first embodiment described above, and the side sill outer shell 25b is formed integrally with the floor panel lower wall 25a of the outer skin 25, but the embodiment shown in FIG. In this embodiment, the side sill shell 31b is formed integrally with the floor panel upper wall 31a of the inner skin 31, and the outer end in the vehicle width direction of the floor panel lower wall 25a is connected to the lower surface of the lower wall a of the side sill shell 31b. . Also according to the embodiment shown in FIG. 5 (B), the same effect as the first embodiment can be achieved.

  Further, in the first embodiment shown in FIG. 5 (A), the outer walls d and d of the side sill outer shell 25b are divided into two to form an opening e, but in the embodiment shown in FIG. 5 (C), One outer wall d is connected to the lower wall a and the upper wall c, and the side sill outline 25b forms a closed cross section. The embodiment shown in FIG. 5D is a modification of the above embodiment, and the side sill outline 31 b is formed integrally with the inner skin 31 instead of the outer skin 25. According to these embodiments, since the side sill outlines 25b and 31b form a closed cross section, the strength of the side sill outlines 25b and 31b can be increased and the energy absorbing member 26 can be held more firmly.

  Further, in the first embodiment shown in FIG. 5A, the floor panel lower wall 25a is connected to the lower wall a and the inner wall b of the side sill outer shell 25b, but the embodiment shown in FIG. The floor panel lower wall 25a is connected only to the lower wall a of the side sill shell 25b, and the inner wall b is connected to the floor panel upper wall 31a. The embodiment shown in FIG. 5F is a modification of the above embodiment, and the side sill outline 31 b is formed integrally with the inner skin 31 instead of the outer skin 25. According to these embodiments, the ends of the carbon fibers of the side sill shells 25b and 31b are connected to only one of the carbon fibers of the floor panel lower wall 25a or the floor panel upper wall 31a. The structure can be simplified by eliminating the branching portion.

  5A to 5F, the carbon fiber of the floor panel lower wall 25a or the floor panel upper wall 31a is used as the side sill shell 25b or the side sill shell 25b at the connecting portion of the floor panel portion 12 and the side sill portion 13. It continues to the carbon fiber of the side sill shell 31b.

  FIG. 6 shows a modification of the embodiment shown in FIG.

  5A to 5F, the inner skin 31 is separated into the left and right in the floor tunnel portion 12b, and the floor core 23 is also separated into the left and right in that portion. In the embodiment of (F), the inner skin 31 and the floor core 23 are not separated left and right in the floor tunnel portion 12b, and the floor tunnel portion 12b has a three-layer structure of the outer skin 25, the floor core 23, and the inner skin 31. Yes.

  6 (A) to 6 (F), the carbon fiber of the floor panel lower wall 25a or the floor panel upper wall 31a is used as the side sill outer shell 25b or the side sill shell 25b at the connecting portion of the floor panel portion 12 and the side sill portion 13. It continues to the carbon fiber of the side sill shell 31b.

  6A to 6F, the strength of the floor panel portion 12 near the floor tunnel portion 12b can be further increased.

  FIG. 7 shows another embodiment of the energy absorbing member 26.

  Although the hollow structure 28 of the first embodiment has a simple rectangular cross section, a lattice-shaped partition wall having various shapes may be formed inside the hollow structure 28. Further, the energy absorbing member 26 of the first embodiment includes the side sill core 29, but the side sill core 29 may be eliminated and the energy absorbing member 26 may be configured with only the hollow structure 28. Further, although the side sill core 29 of the first embodiment is made of urethane foam, as shown in FIG. 8B, the side sill core 29 may be configured by combining CFRP or GFRP plate materials.

As shown in FIG. 7A, the energy absorbing member 26 having only the hollow structure 28 without the side sill core 29 can be manufactured by any of the following manufacturing methods.
(1) Using the tubular preform of the hollow structure 28 manufactured by the braiding method, the hollow structure 28 made of fiber-reinforced resin is manufactured by the RTM method.
(2) The hollow structure 28 made of fiber reinforced resin is manufactured by pultrusion molding.
(3) The hollow structure 28 is manufactured by assembling a plurality of fiber reinforced resin members formed by the RTM method by bonding.
(4) The hollow structure 28 is manufactured by assembling together a plurality of fiber-reinforced resin members that have been hot-press molded.

As shown in FIG. 7B, the energy absorbing member 26 having the side sill core 29 inside the hollow structure 28 can be manufactured by any of the following manufacturing methods.
(1) A tubular preform of a hollow structure 28 is manufactured by a braiding method using a side sill core 29 made of urethane foam as a core, and an energy absorbing member 26 is manufactured by impregnating the preform with a resin by the RTM method. .
(2) The energy absorbing member 26 is manufactured by inserting the side sill core 29 made of urethane foam into the hollow structure 28 made of fiber reinforced resin manufactured by pultrusion molding.
(3) The energy absorbing member 26 is manufactured by bonding the side sill core 29 made of fiber reinforced resin to the inside of the hollow structure 28 manufactured by assembling and manufacturing a plurality of fiber reinforced resin members molded by the RTM method.
(4) A fiber reinforced resin side sill core 29 is integrally formed on one of a plurality of fiber reinforced resin members formed by the RTM method, and the plurality of fiber reinforced resin members are assembled by bonding to manufacture an energy absorbing member 26. To do.
(5) The hollow structure 28 is manufactured by assembling a plurality of warm press-molded fiber reinforced resin members by bonding, and the energy absorbing member 26 is manufactured by bonding a side sill core 29 made of fiber reinforced resin therein.

  Next, an embodiment of a method for manufacturing the energy absorbing member 26 having the hollow structure 28 having a “day” -shaped cross section will be described with reference to FIG. 9.

The energy absorbing member 26 in FIG. 9A is composed of a hollow structure 28 that does not have the side sill core 29, and can be manufactured by the following manufacturing method.
(1) After forming the hollow structure 28 by the RTM method in a state where the hollow portion of the preform is filled with lost wax as a core, the lost wax is removed to produce the hollow structure 28.

In the energy absorbing member 26 of FIG. 9B, a hollow structure 28 having no side sill core 29 is formed in an “E” -shaped cross section, and its opening is a separate member made of CFRP or GFRP. It can be manufactured by any of the manufacturing methods shown below.
(1) After manufacturing the hollow structure 28 having an "E" -shaped cross section by the RTM method, the plate 28a is bonded to the opening to manufacture the hollow structure 28.
(2) After manufacturing the hollow structure 28 having the “E” -shaped cross section by warm press molding, the plate 28a is bonded to the opening to manufacture the hollow structure 28.

The energy absorbing member 26 shown in FIG. 9C has a hollow structure 28 formed in a “day” -shaped cross section and filled with a side sill core 29 made of urethane foam. Can be manufactured.
(1) The energy absorbing member 26 is manufactured by impregnating a resin by a RTM method into a preform of a hollow structure 28 having a “day” -shaped cross section filled with a side sill core 29 made of urethane foam.

The energy absorbing member 26 in FIG. 9 (D) has a hollow structure 28 formed in an “E” -shaped cross section and filled with a side sill core 29 made of urethane foam. It can be manufactured by either of these.
(1) The energy absorbing member 26 is manufactured by impregnating a resin by a RTM method into a preform of a hollow structure 28 having an E-shaped cross section filled with a side sill core 29 made of urethane foam.
(2) After manufacturing the hollow structure 28 having a cross-section of “E” shape by warm press molding, a side sill core 29 made of urethane foam is inserted through the opening and bonded to form the hollow structure 28. To manufacture.

The energy absorbing member 26 in FIG. 9 (E) has a hollow structure 28 formed in an “E” -shaped cross section and filled with a side sill core 29 made of urethane foam. The opening is closed with a plate 28a and can be manufactured by any of the following manufacturing methods.
(1) A preform of a hollow structure 28 having an E-shaped cross section filled with a urethane foam side sill core 29 is impregnated with a resin by the RTM method, and then a plate is formed in the opening of the hollow structure 28 The energy absorbing member 26 is manufactured by bonding 28a.
(2) A hollow structure 28 having a cross section of “E” shape is manufactured by warm press molding, and a side sill core 29 made of urethane foam is bonded from the opening, and then a plate is formed on the opening of the hollow structure 28. The energy absorbing member 26 is manufactured by bonding 28a.

  FIG. 10 shows another embodiment of the energy absorbing member 26.

  FIG. 10A corresponds to the above-described first embodiment, and the energy absorbing member 26 is arranged so as to fill the entire inner space of the side sill outer shell 25b. In the embodiment shown in FIG. 10 (B), the energy absorbing member 26 is disposed only in the front-rear direction intermediate portion of the inner space of the side sill outer shell 25b. In the embodiment shown in FIG. The member 26 is divided into three parts and arranged at the front, middle, and rear of the internal space of the side sill shell 25b.

  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 shape and material of the hollow structure 28 and the side sill core 29 of the energy absorbing member 26 are not limited to the embodiment.

DESCRIPTION OF SYMBOLS 11 Floor 12 Floor panel part 13 Side sill part 23 Floor core 25a Floor panel lower wall 25b Side sill outer wall 26 Energy absorption member 30 Mold 31a Floor panel upper wall 31b Side sill outer wall d Outer wall

Claims (7)

An automotive floor structure in which an automobile floor (11) having side sill portions (13) on both sides in the vehicle width direction of the floor panel portion (12) is RTM-molded with carbon fiber reinforced resin,
The side sill portion (13) includes a hollow side sill shell (25b, 31b) and an energy absorbing member (26) held inside the side sill shell (25b, 31b). The energy absorbing member (26) A vehicle floor structure characterized in that the upper and lower surfaces and the inner and outer surfaces in the vehicle width direction are covered by side sill shells (25b, 31b).   The automobile floor structure according to claim 1, wherein the carbon fiber of the floor panel (12) and the carbon fiber of the side sill shell (25b, 31b) are continuous.   The floor panel (12) includes a lower floor panel lower wall (25a) and an upper floor panel upper wall (31a), and the floor panel lower wall (25a) and the floor panel upper wall (31a) One of the carbon fibers is continuous with the carbon fiber of the side sill outline (25b, 31b), and the side sill outline (25b, 31b) forms an open cross section that opens at the outer wall (d) on the outer side in the vehicle width direction. The automobile floor structure according to claim 2.   The floor panel (12) includes a lower floor panel lower wall (25a) and an upper floor panel upper wall (31a), and the floor panel lower wall (25a) and the floor panel upper wall (31a) The automobile floor structure according to claim 2, wherein one of the carbon fibers is continuous with the carbon fiber of the side sill outline (25b, 31b), and the side sill outline (25b) forms a closed cross section.   The floor panel (12) includes a lower floor panel lower wall (25a) and an upper floor panel upper wall (31a), and the floor panel lower wall (25a) and the floor panel upper wall (31a) One of the carbon fibers is continuous with the carbon fiber of the side sill outline (25b, 31b), and the end of the carbon fiber of the side sill outline (25b, 31b) is the floor panel lower wall (25a) and the floor panel upper wall. The automobile floor structure according to claim 2, wherein the floor structure is connected to an end portion of the other carbon fiber of any one of (31 a).   The automobile floor according to any one of claims 3 to 5, wherein a floor core (23) is joined between the floor panel lower wall (25a) and the floor panel upper wall (31a). Construction.   Any one of claims 1 to 6, wherein a preform in which the energy absorbing member (26) is wrapped in a preform of the side sill shell (25b) is set in a mold (30) and RTM molded. The automobile floor structure according to claim 1.

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