JP7211025B2 - structural member - Google Patents

Description

The present invention relates to structural members.

Members made of various materials are sometimes used as structural members for automobiles, aircraft, and industrial machinery. For example, structural members that include portions made of fiber-reinforced resin may be used. Patent Documents 1 and 2 disclose examples of using a member including a portion made of fiber-reinforced resin as a structural member that constitutes the vehicle body of an automobile.

In Patent Document 1, the panel member connected to the side sill and the second floor frame is composed of a panel-shaped viscoelastic member made of synthetic resin and a carbon fiber member embedded inside the viscoelastic member. It is disclosed to configure.

Patent Literature 2 discloses that a band plate material for reinforcing the rigidity of the lower portion of the vehicle body of an automobile is made of carbon fiber reinforced resin.

As disclosed in these documents, high rigidity can be obtained by forming the constituent members from fiber reinforced resins such as carbon fiber reinforced resins.

JP 2015-174611 A JP 2017-61170 A

However, with the techniques disclosed in Patent Documents 1 and 2, there is a problem in obtaining a high vibration damping effect when a bending load is input while suppressing an increase in mass. That is, since the members disclosed in Patent Documents 1 and 2 are solid members in which carbon fibers are embedded inside, high flexural rigidity can be obtained, but the flexural rigidity in the plate thickness direction is not fully utilized. In order to improve the torsional rigidity, it is necessary to increase the thickness of the member. Therefore, with the techniques disclosed in Patent Documents 1 and 2, an attempt to improve torsional rigidity and obtain a high vibration damping effect results in an increase in mass.

It should be noted that the above-described problems are the same in various structural bodies, not limited to vehicle bodies such as automobiles. Similar problems also exist in structural members using materials other than fiber-reinforced resin.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a structural member capable of obtaining a high vibration damping effect when a bending load is applied while suppressing an increase in mass. and

A structural member according to an aspect of the present invention is a long structural member that extends in a predetermined direction, and includes a hollow bar member formed to extend in the longitudinal direction of the structural member, the bar member comprising the bar member. When the member is viewed in a cross section in a direction orthogonal to the longitudinal direction , the outer peripheral wall of the bar member has an open cross-sectional shape with an opening in a part, and the inner space of the bar member has an opening along the outer peripheral wall. In the cross-sectional view, the bar member has a rectangular cross section and the outer peripheral wall has a corner portion The inner closed cross section is provided with the corners of the quadrangular cross section as ridgelines, and the opening is formed so as to extend continuously over the longitudinal direction of the outer peripheral wall.

In the structural member configured as described above, the bar member has an open cross-sectional shape, not a closed cross-sectional shape, so that torsional rigidity can be controlled.

In addition, in the structural member having the above configuration, since the portion along the outer peripheral wall in the internal space has an internal closed cross section, it is possible to more reliably control the torsional rigidity when a bending load is input while suppressing an increase in mass. It has a high vibration damping effect.

Further, in the structural member having the above configuration, since the internally closed cross-sectional portion is provided with the corner portion as the ridge line, high strength can be obtained. In addition, even in the structural member having the above configuration, since the portion along the outer peripheral wall in the internal space has an internal closed cross section, it is possible to more reliably control the torsional rigidity when a bending load is input while suppressing an increase in mass. It has a high vibration damping effect.

Further , in the structural member having the above configuration, the inner closed cross-section is provided with each corner of the quadrangular cross-section as the ridge line, so that even higher strength can be obtained. In addition, even in the structural member having the above configuration, since the portion along the outer peripheral wall in the internal space has an internal closed cross section, it is possible to more reliably control the torsional rigidity when a bending load is input while suppressing an increase in mass. It has a high vibration damping effect.
Therefore, with the structural member having the above configuration, it is possible to obtain a high vibration damping effect when a bending load is input while suppressing an increase in mass.
In the above description, "having a hollow structure" means that the bar member itself has a hollow structure. It also includes a configuration.
In the above description, the term "corner" means not only a form without rounded corners, but also a form with rounded corners of R15 or less.

A structural member according to an aspect of the present invention is a long structural member that extends in a predetermined direction, and includes a hollow bar member formed to extend in the longitudinal direction of the structural member, the bar member comprising the bar member. When the member is viewed in a cross section in a direction orthogonal to the longitudinal direction, the outer peripheral wall of the bar member has an open cross-sectional shape with an opening in a part, and the inner space of the bar member has an opening along the outer peripheral wall. In the cross-sectional view, the outer peripheral wall of the bar member has five or more corners. The inner closed cross section is provided with the corner as a ridgeline, and the opening is formed so as to extend continuously along the longitudinal direction of the outer peripheral wall.
Even with the structural member having the above configuration, it is possible to obtain a high vibration damping effect when a bending load is input while suppressing an increase in mass.
In the above description, the phrase "having a hollow structure" means that the bar member itself has a hollow structure. It also includes the configured configuration.
Also, in the above description, the term "corner" means not only a shape without rounded corners, but also a shape with rounded corners of R15 or less.

A structural member according to an aspect of the present invention is a long structural member that extends in a predetermined direction, and includes a hollow bar member formed to extend in the longitudinal direction of the structural member, the bar member comprising the bar member. When the member is viewed in cross section in a direction orthogonal to the longitudinal direction, the outer peripheral wall of the bar member has an open cross-sectional shape with an opening in part, and the inner space of the bar member has the above- mentioned An inner closed cross-sectional portion having a closed cross-sectional shape is provided along the outer peripheral wall at a position different from the opening, and in the cross-sectional view, the bar member has a substantially circular cross-section and a substantially elliptical cross-section. It has either a cross section or a substantially medium circular cross section, and the opening is formed so as to be continuous over the longitudinal direction of the outer peripheral wall.
In the structural member configured as described above, the bar member has an open cross-sectional shape, not a closed cross-sectional shape, so that torsional rigidity can be controlled.
In addition, in the structural member having the above configuration, since the portion along the outer peripheral wall in the internal space has an internal closed cross section, it is possible to more reliably control the torsional rigidity when a bending load is input while suppressing an increase in mass. It has a high vibration damping effect.
Therefore, with the structural member having the above configuration, it is possible to obtain a high vibration damping effect when a bending load is input while suppressing an increase in mass.
In the above description, the phrase "having a hollow structure" means that the bar member itself has a hollow structure. It also includes the configured configuration.

In the structural member according to the aspect described above, in the cross-sectional view, the opening may be provided only at one location on the outer peripheral wall.
In the structural member according to the above aspect, in the cross-sectional view, the openings are provided at a plurality of locations on the outer peripheral wall, and each of the openings provided at the plurality of locations has the openings. An adhesive layer is further provided for connecting the ends of the outer peripheral wall to each other, and in the cross-sectional view, the openings provided at the plurality of locations are the first openings provided at positions separated from each other and the first openings provided at positions separated from each other. 2 openings, wherein the first opening is the distance between the ends of the outer peripheral wall that constitutes the first opening, and the first distance is the distance between the ends of the outer peripheral wall that constitutes the second opening. It may be provided so as to be wider than the second interval, which is the interval between the ends.
In the structural member according to the aspect described above, the inner space of the inner closed cross-section portion may be polygonal or arc-shaped in the cross-sectional view.

In the structural member according to the above aspect, in the cross-sectional view, the bar member includes an outer shell component having a wall forming the outer peripheral wall, and an inner shell component accommodated in the internal space of the outer shell component. and the inner closed cross-sectional portion may be provided between the inner wall surface of the outer shell constituting member and the outer wall surface of the inner shell constituting member.

In the structural member configured as described above, a bar member having an inner closed cross-sectional portion in a portion along the outer peripheral wall in the inner space is formed by combining the outer shell member and the inner shell member accommodated in the inner space. Therefore, as compared with the case of using an integrally structured bar member, it is possible to avoid complicated work at the time of manufacturing, and it is possible to reduce the manufacturing cost.

A structural member according to an aspect of the present invention is a long structural member that extends in a predetermined direction, and includes a hollow bar member formed to extend in the longitudinal direction of the structural member, the bar member comprising the bar member. When the member is viewed in a cross section in a direction orthogonal to the longitudinal direction, the outer peripheral wall of the bar member has an open cross-sectional shape with an opening in a part, and the inner space of the bar member has an opening along the outer peripheral wall. The outer shell forming member has an inner closed cross-sectional portion having a closed cross-sectional shape at a position different from the opening, and in the cross-sectional view, the bar member has a wall that constitutes the outer peripheral wall. and an inner shell component accommodated in the internal space of the outer shell component, wherein the internal closed cross-sectional portion comprises an inner wall surface of the outer shell component and an outer wall surface of the inner shell component. and, in the cross-sectional view, the outer shell constituent member is made up of a plurality of constituent members, the inner shell constituent member is made up of a plurality of constituent members, and the inner closed The cross-sectional portion is provided between the inner wall surface of the outer shell constituting member and the outer wall surface of the inner shell constituting member. The inner two constituent members are arranged so that an outer opening of the outer shell constituent member is provided between the ends, and the opening is the outer opening, and in the cross-sectional view, Two of the plurality of constituent members constituting the inner shell constituent member are arranged such that the inner opening of the inner shell constituent member is provided between the ends thereof, and the outer opening is and each of the outer opening and the inner opening is formed so as to be continuous in the longitudinal direction.

In the structural member configured as described above, the bar member has an open cross-sectional shape, not a closed cross-sectional shape, so that torsional rigidity can be controlled.
In addition, in the structural member having the above configuration, since the portion along the outer peripheral wall in the internal space has an internal closed cross section, it is possible to more reliably control the torsional rigidity when a bending load is input while suppressing an increase in mass. It has a high vibration damping effect.
Further, in the structural member having the above configuration, the combination of the outer shell forming member and the inner shell forming member accommodated in the inner space has an inner closed cross-sectional portion along the outer peripheral wall of the inner space. Since the bar member is configured, it is possible to avoid complicated work at the time of manufacturing and to reduce the manufacturing cost, as compared with the case where the bar member has an integral structure.
In addition, in the structural member having the above configuration, each of the outer shell constituent member and the inner shell constituent member is composed of a plurality of constituent members, which is advantageous in avoiding complicated operations during manufacturing. It is possible to reduce manufacturing costs.
Therefore, even with the structural member having the above configuration, it is possible to obtain a high vibration damping effect when a bending load is input while suppressing an increase in mass.
In the above description, the phrase "having a hollow structure" means that the bar member itself has a hollow structure. It also includes the configured configuration.

In the structural member according to the aspect described above, in the cross-sectional view, the outer shell constituting member is composed of a first bar constituting member and a second bar constituting member, each of which has a hat-shaped cross-sectional shape and is arranged to face each other. , The inner shell forming member may be composed of a third bar forming member and a fourth bar forming member, each of which has a hat-shaped cross-sectional shape, and which are arranged to face each other.

In the structural member having the above configuration, the outer shell member is formed by combining the two bar members, and the inner shell member is formed by combining the two bar members. can be avoided. That is, compared to the case where one member constitutes the outer shell constituent member and the one member constitutes the inner shell constituent member, the outer shell constituent member can be formed by assembling two prefabricated bar constituent members respectively. Since the member and the inner shell forming member can be configured, it is possible to avoid complicated work at the time of manufacturing.

The structural member according to the above aspect further includes a connecting portion that connects between one end portions of the first bar component member and the second bar component member and between the other end portions in the cross-sectional view, The first bar component and the second bar component are opposed to each other such that a first gap is provided between the one ends and a second gap narrower than the first gap is provided between the other ends. The internal space is provided with a first internal closed cross section on the one end side and a second internal closed cross section on the other end side, and the first internal The closed cross-sectional area of the closed cross-sectional portion may be larger than the closed cross-sectional area of the second internal closed cross-sectional portion.

In the structural member having the above configuration, the closed cross-sectional area of the first internal closed cross-sectional area is changed to the second internal space in accordance with the width of the first distance between the one end portions and the second distance between the other end portions. Since the closed cross-sectional area is larger than the closed cross-sectional area of the closed cross-sectional portion, it is possible to balance the torsional rigidity of the entire bar member when a bending load is input. Therefore, with the structural member having the above configuration, a higher vibration damping effect can be obtained.

In the structural member according to the aspect described above, the bar member may be made of fiber-reinforced resin.

In the structural member having the above configuration, since the bar member is made of fiber-reinforced resin, it is excellent in ensuring high flexural rigidity.

In addition, in the structural member according to the above aspect, the bar member is made of a fiber-reinforced resin in which 50% or more of the reinforcing fibers are oriented in the longitudinal direction from the viewpoint of ensuring high bending rigidity and high vibration damping effect. desirable from

In the structural member described above, it is possible to obtain a high vibration damping effect when a bending load is input while suppressing an increase in mass.

It is a model bottom view which shows the undersurface structure of the vehicle body which concerns on 1st Embodiment. It is a schematic bottom view showing a partial configuration of the bottom surface of the vehicle body. FIG. 2 is a schematic perspective view showing the configuration of the interior of the vehicle body; FIG. 4 is a schematic perspective view showing the configuration of a reinforcing member; FIG. 5 is a view showing the VV cross section of FIG. 4, and is a schematic cross-sectional view showing the structure of the bar member in the reinforcing member. FIG. 4 is a schematic diagram showing the configuration of a bar-constituting member; (a) is a schematic cross-sectional view showing the configuration of a bar member according to a comparative example, and (b) is a schematic cross-sectional view showing the configuration of a bar member according to a reference example. 4 is a graph showing strain energy per unit mass in each of Examples, Reference Examples, and Comparative Examples. (a) is a schematic cross-sectional view showing a configuration of a corner according to Modification 1, (b) is a schematic cross-sectional view showing a configuration of a corner according to Modification 2, and (c) is a modification FIG. 11 is a schematic cross-sectional view showing the configuration of a corner portion according to Example 3; (a) is a schematic cross-sectional view showing the configuration of a bar member according to a second embodiment, and (b) is a schematic cross-sectional view showing the configuration of a bar member according to a third embodiment. (a) is a schematic cross-sectional view showing the configuration of a bar member according to a fourth embodiment, and (b) is a schematic cross-sectional view showing the configuration of a bar member according to a fifth embodiment. (a) is a schematic cross-sectional view showing the configuration of a bar member according to a sixth embodiment, and (b) is a schematic cross-sectional view showing the configuration of a bar member according to a seventh embodiment. (a) is a schematic cross-sectional view showing the configuration of a bar member according to an eighth embodiment, and (b) is a schematic cross-sectional view showing the configuration of a bar member according to a ninth embodiment. FIG. 3 is a schematic diagram showing a simple spring model of a vehicle body; 4 is a graph showing the relationship between the rigidity of a carbon fiber reinforced resin member and the strain energy accumulated therein.

[Study on the relationship between torsional rigidity and vibration damping in structural members]
First, the inventors of the present application studied the relationship between the torsional rigidity and the vibration damping performance of a structural member including a portion made of fiber-reinforced resin. The results of the study will be described below.

The inventors of the present application have diligently studied the relationship between torsional rigidity and vibration damping performance when a structural member including a portion made of fiber-reinforced resin is employed in a vehicle body.

In the vehicle body, the behavior modes of the vehicle body that affect the ride comfort felt by the occupants are mainly classified into the following two behavior modes.

<First vehicle body mode> A vehicle body torsional mode associated with torsional deformation, which is a torsional displacement motion of the entire vehicle body caused by a phase delay based on a torsional moment about the center axis of the vehicle body when the vehicle turns. This is the vehicle body mode.

<Second vehicle body mode> This is a film vibration mode associated with bending deformation, which is a vertical displacement movement due to the floor panel when running on a bump on the road surface or when running on a rough road surface, and is related to vibration. mode.

Carbon fiber reinforced resin, which is a type of fiber reinforced resin, is an anisotropic material, and by arranging the fibers in the fiber reinforced resin in one direction in the longitudinal direction, the torsional loss coefficient has a higher value than the bending loss coefficient. Since it is an anisotropic material, it is desirable to further enhance the vibration damping ability (strain energy storage ability) possessed by the strip material disclosed in Patent Document 2 above.

That is, even if the carbon fiber reinforced resin constituting the strip material disclosed in Patent Document 2 has a high strain energy storage capacity as a physical property of the material itself, the strip material is connected to the floor panel (or to the floor panel). When performing the same deformation behavior as the frame member), the strain energy dissipation ability corresponding to the torsional deformation accompanying the behavior is high, and the strain energy dissipation ability corresponding to bending deformation is low. However, it is difficult to effectively utilize and use up the vibration damping ability to be used.

Based on the above matters, the inventors of the present application conducted a first verification analysis on the strain energy storage capacity of carbon fiber reinforced resin. This will be described with reference to FIGS. 14 and 15. FIG.

As shown in FIG. 14, when looking at the overall structure of the vehicle body with respect to strain energy, in a normal vehicle body structure, a vehicle body mechanism with a spring constant Kb, a carbon fiber reinforced resin portion with a spring constant Kcf, and a coupling with a spring constant Kj. It can be expressed as a simple spring model in which a member system mechanism consisting of parts and are connected in parallel.

Therefore, the inventors of the present application obtained the correlation between the rigidity of the carbon fiber reinforced resin portion and the accumulated strain energy by numerically analyzing the simple spring model shown in FIG.

As shown in FIG. 15, as a result of numerical analysis conducted by the inventors of the present application, the strain energy accumulated in the carbon fiber reinforced resin portion decreases as the stiffness increases, except for the region where the stiffness is extremely low. , we have obtained knowledge of physical properties that the peak point of strain energy exists in a portion with low rigidity.

As for the vehicle body as a whole, there is a possibility that the decrease in rigidity will impair the sense of security in which the phase delay of the vehicle body vibration is not caused, leading to a decrease in ride comfort. That is, it is important to ensure both the rigidity of the vehicle body and the increase in strain energy accumulated and dissipated in the carbon fiber reinforced resin portion.

An embodiment of the present invention proposed based on the above findings will be described below. In addition, the form described below is an example of the present invention, and the present invention is not limited to the following forms except for its essential configuration.

1 to 3, "Fr" indicates the front of the vehicle, "Re" indicates the rear of the vehicle, "Le" indicates the left of the vehicle, and "Ri" indicates the right of the vehicle. This is the direction based on the forward direction of the vehicle when it is assumed.

[First embodiment]
1. Structure of the Underside of the Vehicle Body 1 and the Interior of the Vehicle Interior 1b The structure of the undersurface of the vehicle body 1 and the interior of the vehicle interior 1b according to the present embodiment will be described with reference to FIGS. 1 to 3. FIG. FIG. 1 is a schematic bottom view showing the configuration of the bottom surface of the vehicle body 1, FIG. 2 is a schematic bottom view showing the configuration of a part of the bottom surface of the vehicle body 1, and FIG. It is a schematic perspective view showing the.

The vehicle body 1 of the vehicle according to this embodiment is a monocoque vehicle body. As shown in FIGS. 1 to 3, the vehicle body 1 includes a floor panel 2 that forms the lower surface (bottom surface) of the vehicle interior 1b, a dash panel 3 that separates the engine room 1a and the vehicle interior 1b, and a panel in front of the dash panel 3. A pair of left and right front side frames 4 provided so as to extend toward and a pair of left and right rear side frames 5 provided to extend rearward from the rear side end portion of the floor panel 2. - 特許庁

The dash panel 3 is provided so as to extend upward from the front end portion of the floor panel 2 .

Further, the vehicle body 1 includes a pair of left and right side sills 6 disposed at both left and right end portions of the floor panel 2, and a pair of left and right hinge pillars 7 provided to extend upward from the respective front end portions of the pair of left and right side sills 6. A pair of left and right center pillars 8 provided to extend upward from intermediate portions of the pair of left and right side sills 6, and a pair of left and right hinge pillars 7 provided to extend obliquely rearward from the upper end portions of the hinge pillars 7. A pair of left and right front pillars 9 and a pair of left and right roof side rails 10 provided to extend rearward from respective rear end portions of the pair of left and right front pillars 9 are provided.

The pair of left and right roof side rails 10 are joined to the center pillar 8 at its upper end portion and its rear end portion.

As shown in FIGS. 1 to 3, the floor panel 2 of the vehicle body 1 is provided with a tunnel portion 11 having a substantially rectangular shape when viewed from below. The tunnel portion 11 extends in the front-rear direction (Fr-Re direction) at a central portion in the vehicle width direction (Le-Ri direction) and is provided in a state of protruding from the vehicle interior 1b.

A pair of left and right tunnel frame portions 12 each extending in the front-rear direction (Fr-Re direction) are provided at both left and right end portions of the tunnel portion 11 . Each of the pair of left and right tunnel frame portions 12 has a substantially hat-shaped cross section, and cooperates with the lower surface of the floor panel 2 to form a substantially rectangular closed structure extending substantially parallel to the front-rear direction (Fr-Re direction). constitutes a cross section.

Between each of the pair of left and right side sills 6 and each of the pair of left and right tunnel frame portions 12 is provided a floor frame 13 extending in the front-rear direction (Fr-Re direction) and having a substantially hat-shaped cross section. It is Each of the floor frames 13 is disposed so as to extend outward from the vehicle body 1 as it goes toward the rear side (Re side) of the vehicle body 1, and cooperates with the lower surface of the floor panel 2 in the front-rear direction (Fr-Re direction). ), forming a substantially rectangular closed cross-section extending substantially parallel to the .

A front end portion of each floor frame 13 is joined to a rear end portion of the front side frame 4 .

The floor panel 2 includes cross members 14 and 15 extending in the left-right direction (Le-Ri direction) while bridging the tunnel portion 11 in the passenger compartment 1b. Each of the cross members 14 and 15 has a substantially hat-shaped cross section. Each of the cross members 14 and 15 has a substantially rectangular shape extending in the left-right direction (Le-Ri direction) from the side wall portion of the tunnel portion 11 to the side wall portion of the side sill 6 in cooperation with the upper surface of the floor panel 2 . constitutes a cross section.

The cross member 14 is disposed at a position corresponding to an intermediate portion between the hinge pillar 7 and the center pillar 8, and is joined to the front side wall portion of the cross member 14 with the floor panel 2 sandwiched between the front end portion of the floor frame 13. The rear end portion of the upper frame 16 is joined.

The cross member 15 is arranged substantially parallel to the cross member 14 and arranged at a position corresponding to the center pillar 8 .

A pair of left and right front seats (not shown) are arranged in the compartment 1b. Each seat has a seat frame (not shown) for securing the strength and rigidity of the seat, and is slidable on a pair of left and right seat rails 17 .

As shown in FIG. 3, of the pair of right and left seat rails 17, the outer seat rail 17 in the vehicle width direction has a front end portion (front seat mounting portion) fixed to the outer portion of the cross member 14 in the vehicle width direction. A rear end portion (rear seat mounting portion) is fixed to an outer portion of the cross member 15 in the vehicle width direction.

Of the pair of left and right seat rails 17, the inner seat rail 17 in the vehicle width direction has a front end portion (front seat mounting portion) fixed to an inner portion of the cross member 14 in the vehicle width direction, and a rear end portion (rear seat). mounting portion) is fixed to the inner portion of the cross member 15 in the vehicle width direction.

A plurality of reinforcing members 21 to 27 are arranged on the lower side of the floor panel 2. As shown in FIG.

2. Configuration of Reinforcing Members 21 to 27 and Attachment Configuration to Members of Vehicle Body 1 The configuration of the reinforcement members 21 to 27 and the attachment configuration to members of the vehicle body 1 will be described with reference to FIGS. 2 and 4. FIG. FIG. 4 is a schematic perspective view showing the configuration of the reinforcing member 21 (an example of the reinforcing members 21 to 27).

As shown in FIG. 2, in the vehicle body 1 according to this embodiment, a plurality of reinforcing members 21 to 27 are arranged in a symmetrical manner. The reinforcing member 21 spans between the side sill 6 on the right side of the vehicle body 1 and the tunnel frame portion 12 and is fixed at a fixing point P to each.

The reinforcing member 22 is bridged between the left and right tunnel frame portions 12 while straddling the tunnel portion 11, and is fixed at a fixing point P to each. The reinforcing member 23 spans between the side sill 6 on the left side of the vehicle body 1 and the tunnel frame portion 12, and is fixed at a fixing point P to each.

The reinforcement member 24 spans between the left side sill 6 of the vehicle body 1 and the tunnel frame portion 12 on the front side of the vehicle body 1 relative to the reinforcement member 23, and is fixed at a fixing point P to each. The reinforcing member 25 spans between the left and right tunnel frame portions 12 while straddling the tunnel portion 11, and is fixed to each of them at a fixing point P. As shown in FIG.

The reinforcing member 26 is bridged between the left and right tunnel frame portions 12 while straddling the tunnel portion 11 on the rear side of the vehicle body 1 relative to the reinforcing member 25, and is fixed at a fixing point P to each. The reinforcing member 27 connects the rear end portion of the reinforcing member 26 to one end of each of the reinforcing member 22 and the reinforcing member 21 , and is fixed to the tunnel frame portion 12 at a fixing point P. As shown in FIG.

In this embodiment, among the reinforcing members 21 to 27, the reinforcing members 22, 25, and 26 are arranged as tunnel members that bridge the tunnel section (floor tunnel).

As shown in FIG. 4, the reinforcing member 21 includes a bar member 210 extending along the Y direction, which is one direction, and fixing members 211 and 212 fixed to both ends of the bar member 210, respectively. and The fixing members 211 and 212 are provided with holes 211a and 212a through which bolts are inserted (arrows A and B). The fixing members 211 and 212 are members for fixing the reinforcing member 21 to each part of the vehicle body 1 by fastening bolts.

The bar member 210 is, as described above, an elongated member extending along the Y direction and having a substantially cylindrical shape.

Although not shown in FIG. 4, the reinforcing members 22 to 27 also have the same configuration as the reinforcing member 21. As shown in FIG. However, the length, cross-sectional size, and the like of the elongated cylindrical portion are appropriately set according to the location of use with respect to the vehicle body 1 .

Here, in the reinforcing members 21 to 27 according to the present embodiment, the main portion of the bar member 210 is constructed using carbon fiber reinforced plastics (CFRP). A specific configuration will be described later.

3. Cross-Sectional Configuration of Bar Members of Reinforcing Members 21 to 27 Cross-sectional configurations of bar members of reinforcing members 21 to 27 will be described with reference to FIGS. 5 and 6. FIG. FIG. 5 is a view showing a VV cross section of FIG. 4, and FIG. 6 is a schematic diagram showing the structure of bar constituent members 213 to 216 that are constituent elements of the bar member 210. As shown in FIG. 5 shows the bar member 210 of the reinforcing member 21 as an example, each bar member of the reinforcing members 22 to 27 has substantially the same cross-sectional configuration.

As shown in FIG. 5, the bar member 210 in the reinforcing member 21 is a hollow structure member having an internal space 210a, and has a substantially closed cross-sectional shape (not a completely closed cross-sectional shape, but narrow intervals in the cross section). It has an open cross-sectional shape). In the inner space of the bar member 210, inner closed cross-sectional portions 210b to 210e having a closed cross-sectional shape are provided along the outer peripheral wall of the bar member 210. As shown in FIG. In this embodiment, the internal closed cross-sections 210b and 210d correspond to the "first internal closed cross-section", and the internal closed cross-sections 210c and 210e correspond to the "second internal closed cross-section".

Specifically, the bar member 210 is composed of four bar constituent members 213 to 216 and two adhesive layers 217 and 218. As shown in FIG. Each of the bar constituent members 213-216 is constructed using CFRP. As shown in FIG. 6, each of the bar constituent members 213 to 216 is composed of resin 2131 as a base material and carbon fiber 2132 as a reinforcing material. In this embodiment, as an example, 50% or more of the carbon fibers are oriented in the longitudinal direction (the Y direction in FIG. 4).

In this embodiment, the bar constituent member 213 corresponds to the "first bar constituent member", the bar constituent member 214 corresponds to the "second bar constituent member", and the bar constituent member 215 corresponds to the "third bar constituent member". , and the bar constituent member 216 corresponds to the “fourth bar constituent member”. Further, in this embodiment, the bar constituent member 213 and the bar constituent member 214 constitute the "outer shell constituent member", and the bar constituent member 215 and the bar constituent member 216 constitute the "inner shell constituent member". there is

Returning to FIG. 5, in a cross section (a cross section perpendicular to the longitudinal direction), the bar constituent member 213 is composed of outer peripheral walls 213c to 213e and flanges 213f and 213g. In other words, the bar constituent member 213 has a substantially hat-shaped cross section. The portion where the outer peripheral wall 213c and the outer peripheral wall 213d meet is a rounded corner portion 213a (the portion indicated by the arrow C1), and the portion where the outer peripheral wall 213c and the outer peripheral wall 213e meet is also rounded. The corner portion 213b has a rounded corner (the portion indicated by the arrow C2).

Similarly, in cross section, the bar component 214 is composed of outer peripheral walls 214c to 214e and flanges 214f and 214g. In other words, the bar constituent member 214 also has a substantially hat-shaped cross-sectional shape. The portion where the outer peripheral wall 214c and the outer peripheral wall 214d meet is a rounded corner portion 214a (the portion indicated by arrow C3), and the portion where the outer peripheral wall 214c and the outer peripheral wall 214e meet is also rounded. The corner portion 214b has a . (portion indicated by an arrow C4).

In cross section, the bar component member 215 is composed of inner walls 215a to 215e and has a substantially hat-shaped cross section. Similarly, the bar-constituting member 216 is composed of inner walls 216a to 216e and has a substantially hat-shaped cross section.

The bar-constituting member 213 and the bar-constituting member 214 are arranged such that the flange portions 213f and 214f face each other with a gap (opening) G1 therebetween, and the flange portions 213g and 214g face each other with a gap (opening) G2 therebetween. They are arranged in a state of facing each other. As a result, in the bar member 210, the bar constituent member 213 and the bar constituent member 214 have a quadrangular cross-sectional shape. In this embodiment, the interval G1 corresponds to the "first interval" and the interval G2 corresponds to the "second interval". The interval G1 and the interval G2 are set so as to satisfy the following relationship.
G1>G2 (Equation 1)
The bar-constituting member 215 and the bar-constituting member 216 face each other in the inner space 210a such that the inner wall 215a and the inner wall 216a face each other with a gap therebetween, and the inner wall 215c and the inner wall 216c face each other with a gap therebetween. placed within.

The adhesive layer 217 is formed to connect the flange portion 213 f of the bar component 213 and the flange portion 214 f of the bar component 214 . The inner wall 215a of the bar component 215 and the inner wall 216a of the bar component 216 are also fixed to the flange portion 213f of the bar component 213 and the flange portion 214f of the bar component 214 by the adhesive layer 217 .

The adhesive layer 218 is formed to connect the flange portion 213g of the bar component 213 and the flange portion 214g of the bar component 214 to each other. The inner wall 215c of the bar constituent member 215 and the inner wall 216c of the bar constituent member 216 are also fixed to the flange portion 213g of the bar constituent member 213 and the flange portion 214g of the bar constituent member 214 by the adhesive layer 218 .

The adhesive layers 217 and 218 are made of a resin material such as a silicone adhesive, and have lower rigidity than the resin 2131 of the bar constituent members 213-216. In addition, in the present embodiment, each of the adhesive layers 217 and 218 corresponds to a “connecting portion”.

Further, in the present embodiment, the flange portion 213f of the bar component member 213 corresponds to "one end portion", and the flange portion 213g corresponds to "the other end portion". Similarly, the flange portion 214f of the bar-constituting member 214 corresponds to "one end", and the flange portion 214g corresponds to "the other end".

The inner closed cross-section portion 210b of the bar member 210 is surrounded by the inner wall surfaces of the outer peripheral walls 213c and 213d of the bar component member 213 and the outer wall surfaces of the inner walls 215a and 215b of the bar component member 215. provided as a ridgeline. The inner closed cross-sectional portion 210b has an X-direction dimension of W1 and a Z-direction dimension of H1.

The inner closed cross-sectional portion 210c of the bar member 210 is surrounded by the inner wall surfaces of the outer peripheral walls 213c and 213e of the bar component member 213 and the outer wall surfaces of the inner walls 215c and 215d of the bar component member 215. provided as a ridgeline. The inner closed cross-sectional portion 210c has an X-direction dimension of W2 and a Z-direction dimension of H2.

The inner closed cross-sectional portion 210d of the bar member 210 is surrounded by the inner wall surfaces of the outer peripheral walls 214c and 214d of the bar component member 214 and the outer wall surfaces of the inner walls 216a and 216b of the bar component member 216. provided as a ridgeline. The inner closed cross-sectional portion 210d has an X-direction dimension of W3 and a Z-direction dimension of H3.

The inner closed cross-sectional portion 210e of the bar member 210 is surrounded by the inner wall surfaces of the outer peripheral walls 214c and 214e of the bar component member 214 and the outer wall surfaces of the inner walls 216c and 216d of the bar component member 216. provided as a ridgeline. The inner closed cross-sectional portion 210e has an X-direction dimension of W4 and a Z-direction dimension of H4.

The dimensions W1 to W4 and H1 to H4 of the internal closed cross sections 210b to 210e are set so as to satisfy the following relationships.
H1≈H3 (Equation 2)
H2≈H4 (equation 3)
H1<H2 (equation 4)
H3<H4 (Equation 5)
W1≈W3 (Equation 6)
W2≈W4 (Equation 7)
W1>W2 (Equation 8)
W3>W4 (equation 9)
As shown in (Equation 2) to (Equation 9) above, in the bar member 210 according to the present embodiment, the closed cross-sectional areas of the inner closed cross-section portions 210b and 210d are equal to the closed cross-sectional areas of the inner closed cross-section portions 210c and 210e. It is set larger than the area. That is, in the cross section of FIG. 5, the closed cross-sectional areas of the internal closed cross-sectional portions 210b and 210d on the side (right side in the X direction) with a relatively wide gap G1 are on the side with a relatively narrow gap G2 ( The closed cross-sectional area is set larger than the closed cross-sectional areas of the internal closed cross-sectional portions 210c and 210e on the left side in the X direction).

Further, as shown in (Equation 8) and (Equation 9) above, the center Ax2 of the bar constituent members 215 and 216 in the X direction is X with respect to the center Ax1 of the bar constituent members 213 and 214 in the X direction. direction is offset to the left.

4. Strain Energy per Unit Mass of Bar Member 210 The strain energy per unit mass of the bar member 210 according to this embodiment will be described with reference to FIGS. 7 and 8. FIG. 7A is a schematic cross-sectional view showing a cross-sectional structure of a bar member 910 according to a comparative example, and FIG. 7B is a schematic cross-sectional view showing a cross-sectional structure of a bar member 810 according to a reference example. FIG. 8 is a graph showing the strain energy per unit mass of the bar member according to the example in comparison with the comparative example and the reference example.

(Example)
The bar member according to the embodiment is the bar member 210 having the cross-sectional configuration shown in FIG.

(Comparative example)
The bar member 910 according to the comparative example is a solid bar member having a rectangular cross section, as shown in FIG. 7(a). It should be noted that the bar member 910 is also made of carbon fiber reinforced resin as in the embodiment.

(Reference example)
A bar member 810 according to the reference example has a substantially closed cross-sectional shape of a hollow structure. As shown in FIG. 7B, the bar member 810 is composed of two bar constituent members 813 and 814 and adhesive layers 817 and 818. As shown in FIG. The bar constituent members 813 and 814 are made of carbon fiber reinforced resin as in the embodiment. Further, in the bar member 810 according to the reference example, an internal closed cross-sectional portion is not formed in the internal space 810a.

Further, in the bar member 810 according to the reference example, the distance between the bar constituent member 813 and the bar constituent member 814 is substantially the same on both sides in the X direction.

The adhesive layers 813 and 814 are made of silicone resin or the like, like the adhesive layers 217 and 218 of the bar member 210 according to the embodiment.

(strain energy per unit mass)
As shown in FIG. 8, the strain energies E210 and E810 per unit mass are higher in the bar members 210 and 810 according to the example and the reference example than in the bar member 910 according to the comparative example. Specifically, the strain energy E810 per terminal mass of the bar member 810 according to the reference example is twice or more the strain energy E910 per unit mass of the bar member 910 according to the comparative example. .

Moreover, the strain energy E210 per terminal mass of the bar member 210 according to the example shows a value that is six times or more the strain energy E910 per unit mass of the bar member 910 according to the comparative example.

5. Effect Since the reinforcing members 21 to 27 according to the present embodiment are provided with the bar member 210 having the bar constituent members 213 to 216 made of carbon fiber reinforced resin, they have high flexural rigidity. Moreover, since the bar member 210 has a substantially closed cross-sectional shape and is not a completely closed cross-section, the torsional rigidity can be controlled.

Furthermore, in the reinforcing members 21 to 27 according to the present embodiment, the internal closed cross-sectional portions 210b to 210e are provided along the outer peripheral walls 213c to 213e and 214c to 214e in the internal space 210a. , the torsional rigidity can be controlled more reliably when a bending load is applied, and a high vibration damping effect can be obtained.

Therefore, in the reinforcing members 21 to 27 according to the present embodiment, it is possible to secure high bending rigidity while suppressing an increase in mass, and to obtain a high vibration damping effect when a bending load is input.

Further, in the reinforcing members 21 to 27 according to the present embodiment, the internally closed cross-sectional portions 210b to 210e are provided with the corners 213a, 213b, 214a, and 214b as ridge lines, so high strength can be obtained.

Further, in the reinforcing members 21 to 27 according to the present embodiment, the four bar constituent members 213 to 216 constitute the bar member 210 having the internal closed cross-section portions 210b to 210e in the internal space 210a. cumbersome work can be avoided. That is, the bar member 210 is formed by assembling the four prefabricated bar constituent members 213 to 216 compared to the case of forming a bar member having an internal closed cross section in the internal space with one member. Therefore, complicated work in manufacturing can be avoided.

In addition, in the reinforcing members 21 to 27 according to the present embodiment, the closed cross-sectional areas of the inner closed cross-sections 210b and 210d on the right side in the X direction are changed to the inner closed cross-sections on the left side in the X direction in accordance with the width of the gap G1 and the gap G2. Since it is made larger than the closed cross-sectional areas of 210c and 210e, it is possible to balance the torsional rigidity of the bar member 210 as a whole when a bending load is input. Therefore, the reinforcing members 21 to 27 according to this embodiment can obtain a higher vibration damping effect.

Further, in the reinforcement members 21 to 27 according to the present embodiment, the bar constituent members 213 to 216 of the bar member 210 are made of carbon fiber reinforced resin, which is excellent in ensuring high bending rigidity.

6. Modified Examples of Corners of Bar Constituent Members Although the corners 213a, 213b, 214a, and 214b of the bar constituent members 213 and 214 of the bar member 210 are described as having rounded corners, the following modified examples are provided. can also be adopted.

(Modification 1)
As shown in FIG. 9(a), a corner 313a of the bar component 313 according to Modification 1 is a non-rounded corner (arrow D1).

(Modification 2)
As shown in FIG. 9(b), a corner 413a of the bar component 413 according to Modification 2 has rounded corners on both the outer peripheral side and the inner peripheral side (arrows D2, D3). . The curvature radius R1 of the corner portion 413a is 15 mm or less (for example, 4 mm to 10 mm or less).

(Modification 3)
As shown in FIG. 9(c), the corner 513a of the bar component 513 according to Modification 3 has a rounded corner on the outer peripheral side (arrow D4) and a non-rounded corner on the inner peripheral side (arrow D4). D5).

Note that the radius of curvature R2 on the outer peripheral side of the corner portion 513a is also 15 mm or less (for example, 4 mm to 10 mm or less).

[Second embodiment]
The configuration of the bar member 610 according to the second embodiment will be described with reference to FIG. 10(a). FIG. 10(a) is a schematic cross-sectional view showing the cross-sectional configuration of the bar member 610 according to this embodiment.

As shown in FIG. 10(a), a bar member 610 according to this embodiment is composed of two bar constituent members 613 and 614 and two adhesive layers 617 and 618. As shown in FIG. The bar constituent members 613 and 614 are members made of CFRP having a substantially hat-shaped cross-sectional shape, like the bar constituent members 213 and 214 described above.

The bar component 613 is composed of three outer walls 613c-613e, two flanges 613f and 613g, and four inner walls 613i-613l.

The bar component 614 is also composed of three outer walls 614c to 614e, two flanges 614f and 614g, and four inner walls 614i to 614l.

Similar to the bar constituent members 213 and 214 according to the first embodiment, the bar constituent member 613 and the bar constituent member 614 have a flange portion 613f and a flange portion 614f facing each other with a gap therebetween. The flange portion 613g and the flange portion 614g are arranged to face each other so as to face each other with a space therebetween. An adhesive layer 617 is formed between the flange portions 613f and 614f, and an adhesive layer 618 is formed between the flange portions 613g and 614g.

The bar member 610 also has a substantially closed cross-sectional shape with an internal space 610a, and four internal closed space portions 610b-610e are provided along the outer peripheral walls 613c-613e and 614c-614e. In the bar member 610 according to the present embodiment as well, the internally closed cross-sectional portion 610b is provided with the corner portion 613a as a ridgeline, the internally closed cross-sectional portion 610c is provided with the corner portion 613b as a ridgeline, and the internally closed cross-sectional portion 610d is provided with the corner portion 613b as a ridgeline. The portion 614a is provided as a ridgeline, and the internally closed cross-sectional portion 610e is provided with a corner portion 614b as a ridgeline.

Also in the bar member 610 according to the present embodiment, the inner closed cross-section portions 610b and 610d are adjusted according to the width of the distance between the flange portions 613f and 614f and the distance between the flange portions 613g and 614g. is larger than the closed cross-sectional areas of the inner closed cross-sectional portions 610c and 610e.

The bar member 610 according to the present embodiment is composed of two bar constituent members 613, 614 and two adhesive layers 617, 618, but the same effect as the bar member 210 according to the first embodiment can be obtained. can be done.

Also, for the corner portions 613a, 613b, 614a, 614b, it is possible to employ the same variation configurations as in the first to third modifications.

[Third Embodiment]
The configuration of the bar member 710 according to the third embodiment will be described with reference to FIG. 10(b). FIG. 10(b) is a schematic cross-sectional view showing the cross-sectional configuration of the bar member 710 according to this embodiment.

As shown in FIG. 10(b), the bar member 710 according to this embodiment is also composed of two bar constituent members 713 and 714 and two adhesive layers 717 and 718. As shown in FIG. The bar constituent members 713 and 714 are members made of CFRP having a substantially hat-shaped cross-sectional shape, like the bar constituent members 213 and 214 and the bar constituent members 613 and 614 .

The bar component 713 is composed of three outer walls 713c to 713e, two flanges 713f and 713g, and three inner walls 713i, 713j and 713m.

The bar-constituting member 714 is composed of three outer peripheral walls 714c to 714e and two flange portions 714f and 714g. The bar component 714 according to this embodiment does not have an inner wall.

As in the first embodiment and the second embodiment, the bar constituent member 713 and the bar constituent member 714 have a flange portion 713f and a flange portion 714f facing each other with a gap therebetween, and a flange portion 713g and a flange portion 714g. are arranged to face each other so that they are spaced apart from each other. An adhesive layer 717 is formed between the flange portions 713f and 714f, and an adhesive layer 718 is formed between the flange portions 713g and 714g.

The bar member 710 has a substantially closed cross-sectional shape having an internal space 710a, and one internal closed space portion 710f is provided along the outer peripheral wall 713c. In the bar member 710 according to the present embodiment, unlike the first embodiment and the second embodiment, the internally closed cross-sectional portion 710f is not provided with corner portions 713a, 713b, 714a, and 714b as ridgelines.

Also in the bar member 710 according to the present embodiment, the configuration in which the interval between the flange portions 713f and 714f is wider than the interval between the flange portions 713g and 714g is similar to the above-described configuration. It is the same as the first embodiment and the second embodiment.

In the bar member 710 according to the present embodiment, the inner closed cross-sectional portion 710f is provided without forming the corners 713a, 713b, 714a, and 714b as ridgelines. Effects similar to those of the embodiment can be obtained.

[Fourth embodiment]
The configuration of the bar member according to the fourth embodiment will be described with reference to FIG. 11(a). FIG. 11(a) is a schematic cross-sectional view showing a cross-sectional configuration of a bar constituent member 720 that constitutes the bar member according to this embodiment. Note that the bar member according to the present embodiment does not have an adhesive layer.

As shown in FIG. 11(a), the bar component 720 according to this embodiment is a member made of CFRP and having a substantially U-shaped cross section. The bar component 720 is composed of three outer walls 720c to 720e and four inner walls 720j to 720m. The bar component 720 has an opening 720b below in the Z direction.

The bar-constituting member 720 has an internal space 720a formed therein, and two internal closed space portions 720h to 720i are provided along the outer peripheral walls 720c to 720e. In the bar-constituting member 720 according to the present embodiment as well, the internally closed cross-sectional portion 720h is provided with the corner portion 720f as the ridgeline, and the internally closed cross-sectional portion 720i is provided with the corner portion 720g as the ridgeline. The internal closed cross-sectional portion 720h is composed of outer peripheral walls 720c, 720d and inner walls 720j, 720k. The internal closed cross-section portion 720i is composed of outer peripheral walls 720c, 720e and inner walls 720l, 720m.

Also in the bar component 720 according to the present embodiment, the width of the inner closed cross-sectional portion 720h and the inner closed cross-sectional portion 720i can be increased.

The same effects as those of the bar member 210 according to the first embodiment can be obtained with the bar member including the bar constituent member 720 according to the present embodiment.

Further, in the bar member according to the present embodiment, since the bar component member 720 having an opening downward in the Z direction is adopted, even if water splashes as shown by arrow E, the opening 720b can be Water and mud are discharged to the outside, and it is difficult for water and mud to remain in the internal space 720a. Therefore, the bar member according to this embodiment has excellent corrosion resistance and high weather resistance.

For the corner portions 720f and 720g, it is possible to employ variations similar to those of Modifications 1 to 3 described above.

[Fifth embodiment]
The configuration of the bar member according to the fifth embodiment will be described with reference to FIG. 11(b). FIG. 11(b) is a schematic cross-sectional view showing the cross-sectional configuration of a bar constituent member 730 that constitutes the bar member according to this embodiment. It should be noted that the bar member according to this embodiment also does not have an adhesive layer, like the bar member according to the fourth embodiment.

As shown in FIG. 11(b), the bar component 730 according to the present embodiment is a member made of CFRP having a substantially U-shaped cross section. The bar component 730 is composed of three outer walls 730c to 730e and two inner walls 730j and 730k. The bar constituent member 730 also has an opening 730b downward in the Z direction, like the bar constituent member 720 according to the fourth embodiment.

The bar-constituting member 730 has an internal space 730a inside, and two internal closed space portions 730h and 730i are provided along the outer peripheral walls 730c to 730e. In the bar-constituting member 730 according to the present embodiment as well, the internally closed cross-sectional portion 730h is provided with the corner portion 730f as the ridgeline, and the internally closed cross-sectional portion 730i is provided with the corner portion 730g as the ridgeline. The internal closed cross-section portion 730h is composed of outer peripheral walls 730c and 730d and an inner wall 730j. The internal closed cross-section portion 730i is composed of outer peripheral walls 730c and 730e and an inner wall 730k.

Also in the bar component 730 according to the present embodiment, the width of the inner closed cross-sectional portion 730h and the inner closed cross-sectional portion 730i may be increased.

The bar member including the bar constituent member 730 according to the present embodiment can also obtain the same effect as the bar member 210 according to the first embodiment, and also has high corrosion resistance in the same manner as the bar member according to the fourth embodiment. Excellent, high weather resistance.

Furthermore, since the bar component 730 according to the present embodiment has the triangular closed inner cross-sectional portions 730h and 730i, it is possible to efficiently suppress the angle change of the ridgeline portion.

For the corner portions 730f and 730g, it is possible to employ variations similar to those of Modifications 1 to 3 described above.

[Sixth Embodiment]
The configuration of the bar member according to the sixth embodiment will be described with reference to FIG. 12(a). FIG. 12(a) is a schematic cross-sectional view showing the cross-sectional configuration of a bar component member 740 that configures the bar member according to this embodiment. The bar member according to the present embodiment may have an adhesive layer as in the first embodiment and the like, or may not have an adhesive layer as in the bar member according to the fourth embodiment. good too.

As shown in FIG. 12(a), the bar component 740 according to the present embodiment is a member made of CFRP having a substantially rectangular cross-sectional shape. The bar component 740 is composed of five outer walls 740c to 740g and four inner walls 740p to 740s. The bar component 740 has an opening 740b between the outer peripheral wall 740e and the outer peripheral wall 740f on the right side in the X direction. The portions of the outer peripheral walls 740e and 740f that face the opening 740b may be flange-shaped as in the first embodiment.

An internal space 740a is formed inside the bar component 740, and four internal closed space portions 740l to 740o are provided along the outer peripheral walls 740c to 740g. In the bar component 740 according to the present embodiment as well, the internal closed cross-sectional portion 740l is provided with the corner portion 740h as a ridgeline, the internal closed cross-sectional portion 740m is provided with the corner portion 740i as a ridgeline, and the internal closed cross-sectional portion 740n is provided with a corner portion 740i as a ridgeline. The corner portion 740j is provided as a ridgeline, and the internally closed cross-sectional portion 740o is provided with a corner portion 740k as a ridgeline. The internal closed cross-section portion 740l is composed of outer peripheral walls 740c and 740e and an inner wall 740p. The internal closed cross-sectional portion 740m is composed of outer peripheral walls 740c and 740g and an inner wall 740q. The internal closed cross-section portion 740n is composed of outer peripheral walls 740d and 740f and an inner wall 740r. The internal closed cross-section portion 740o is composed of outer peripheral walls 740d and 740g and an inner wall 740s.

In the bar component member 740 according to the present embodiment as well, the inner closed cross-section portion 740l and the inner closed cross-section portions 740l to 740o can be widened and narrowed.

The bar member including the bar constituent member 740 according to the present embodiment can also obtain the same effects as the bar member 210 according to the first embodiment, and, similarly to the fifth embodiment, the triangular inner closed cross-sectional portion By having 740l to 740o, it is possible to highly efficiently suppress the angle change of the ridgeline portion.

Note that, for the corner portions 740h to 740k, it is possible to adopt the variation configurations similar to those of Modifications 1 to 3 described above.

[Seventh embodiment]
The configuration of the bar member according to the seventh embodiment will be described with reference to FIG. 12(b). FIG. 12(b) is a schematic cross-sectional view showing the cross-sectional configuration of a bar constituent member 750 that constitutes the bar member according to this embodiment. The bar member according to the present embodiment may have an adhesive layer as in the first embodiment and the like, or may not have an adhesive layer as in the bar member according to the fourth embodiment. good too.

As shown in FIG. 12(b), the bar component 750 according to this embodiment is a member made of CFRP and having a substantially square cross-sectional shape. The bar component member 750 is composed of five outer peripheral walls 750c to 750g and four inner walls 750p to 750s formed so as to be continuous with each other. The bar component 750 also has an opening 750b between the outer peripheral wall 750e and the outer peripheral wall 750f on the right side in the X direction. The portions of the outer peripheral walls 750e and 750f that face the opening 750b may be flange-shaped as in the first embodiment.

An internal space 750a is formed inside the bar component 750, and four internal closed space portions 750l to 750o are provided along the outer peripheral walls 750c to 750g. In the bar-constituting member 750 according to the present embodiment, the inner closed cross-sectional portion 750l is provided with the corner portion 750h as a ridgeline, the inner closed cross-sectional portion 750m is provided with the corner portion 750i as a ridgeline, and the inner closed cross-sectional portion 750n is provided with the corner portion 750i as a ridgeline. The corner portion 750j is provided as a ridgeline, and the internally closed cross-sectional portion 750o is provided with a corner portion 750k as a ridgeline. The internal closed cross-section portion 750l is composed of outer peripheral walls 750c and 750e and an inner wall 750p. The internal closed cross-sectional portion 750m is composed of outer peripheral walls 750c and 750g and an inner wall 750q. The internal closed cross-section portion 750n is composed of outer peripheral walls 750d and 750f and an inner wall 750r. The internal closed cross-section portion 750o is composed of outer peripheral walls 750d and 750g and an inner wall 750s.

Also in the bar component member 750 according to the present embodiment, the inner closed cross-sectional portions 750l to 750o can be widened and narrowed.

The bar member including the bar constituent member 750 according to the present embodiment can also obtain the same effect as the bar member 210 according to the first embodiment, and, similarly to the sixth embodiment, the triangular inner closed cross-sectional portion By having 7501 to 750o, it is possible to highly efficiently suppress the angle change of the ridgeline portion.

For the corner portions 750h to 750k, it is possible to employ the same variation configurations as those of the first to third modifications.

[Eighth embodiment]
The configuration of the bar member according to the eighth embodiment will be described with reference to FIG. 13(a). FIG. 13(a) is a schematic cross-sectional view showing a cross-sectional configuration of a bar constituent member 760 that constitutes the bar member according to this embodiment. The bar member according to the present embodiment may have an adhesive layer as in the first embodiment and the like, or may not have an adhesive layer as in the bar member according to the fourth embodiment. good too.

As shown in FIG. 13(a), the bar component 730 according to this embodiment is a member made of CFRP having a substantially polygonal cross-sectional shape with a partially recessed portion. The bar component member 760 is composed of outer peripheral walls 760c to 760o and four inner walls 760ac, 760bb, 760cb, and 760db. The bar component 760 also has an opening 760b between the outer peripheral wall 760m and the outer peripheral wall 760n on the right side in the X direction. Incidentally, portions of the outer peripheral walls 760m and 760n facing the opening 760b may be flange-shaped as in the first embodiment.

An internal space 760a is formed inside the bar component 760, and four internal closed space portions 760ab, 760ba, 760ca, and 760da are provided along the outer peripheral walls 760c to 760o. In the bar component 760 according to the present embodiment, the internal closed cross-sectional portion 760ab is provided with three corners 760p, 760aa, and 760z as ridgelines (F ₁ , F ₁₂ , F ₁₁ ), and the internal closed cross-sectional portion 760ba is Three corner portions 760q to 760s are provided as ridgelines (F ₂ to F ₄ ), and an internally closed cross-sectional portion 760ca is provided with three corner portions 760t to 760v as ridgelines (F ₅ to F ₇ ). The portion 760da is provided with three corners 760w to 760y as ridgelines (F ₈ to F ₁₀ ).

The internal closed cross section 760ab is composed of outer peripheral walls 760d, 760m, 760g and an inner wall 760ac. The internal closed cross-section portion 760ba is composed of outer peripheral walls 740i, 740n, 760l and an inner wall 760bb. The internal closed cross-section portion 760ca is composed of outer peripheral walls 760h, 760k, 760o and an inner wall 760cb. The internal closed cross-section portion 760da is composed of outer peripheral walls 760c, 760f, 760o and an inner wall 760db.

Also in the bar component 760 according to the present embodiment, the inner closed cross-sectional portions 760ab, 760ba, 760ca, and 760da can be widened and narrowed.

The bar member provided with the bar constituent member 760 according to the present embodiment can also obtain the same effect as the bar member 210 according to the first embodiment, and the 12 ridges are formed as indicated by arrows F ₁ to F ₁₂ . By providing it, bending strength is improved. That is, by providing many ridge lines, it is possible to suppress the bending of the bar constituent member 760 and improve the bending strength.

For the corner portions 760p to 760z and 760aa, it is possible to employ the same variation configurations as those of the first to third modifications.

[Ninth Embodiment]
The configuration of the bar member according to the ninth embodiment will be described with reference to FIG. 13(b). FIG. 13(b) is a schematic cross-sectional view showing the cross-sectional configuration of a bar constituent member 770 that constitutes the bar member according to this embodiment. The bar member according to the present embodiment may have an adhesive layer as in the first embodiment and the like, or may not have an adhesive layer as in the bar member according to the fourth embodiment. good too.

As shown in FIG. 13(b), the bar component 770 according to this embodiment is a member made of CFRP having a substantially elliptical or substantially oval cross-sectional shape. The bar component 770 is composed of an outer peripheral wall 770c and six inner walls 770f to 770k. The bar component member 770 also has an opening 770b on the right side in the X direction. Note that the cross-sectional shape of the bar-constituting member 770 may be a substantially circular cross-section.

The bar-constituting member 770 has an internal space 770a formed therein, and two internal closed space portions 770d and 770e are provided along the outer peripheral wall 770c. The internal closed cross-sectional portion 770d is composed of an outer peripheral wall 770c and three inner walls 770f to 770h. The internal closed cross-section portion 770e is composed of an outer peripheral wall 770c and three inner walls 770i to 770k. The inner walls 770f and 770i are arc-shaped along the outer peripheral wall 770c with a space therebetween.

In addition, in the bar component member 770 according to the present embodiment as well, it is possible to make the inner closed cross-sectional portion 770d and the inner closed cross-sectional portion 770e wide and narrow.

The bar member including the bar component member 770 according to the present embodiment can also obtain the same effects as the bar member 210 according to the first embodiment, and is improved in torsional strength. That is, in the bar component member 770, by adopting a structure in which the component parts are arranged at equal distances L ₁ to L ₄ with respect to the torsion center Ax ₇₇₀ , the stress is evenly applied to the outermost part where the stress is the highest. It can be distributed, and the occurrence of local decrease in strength can be suppressed.

[Other Modifications]
In the first embodiment to the ninth embodiment, the reinforcing members 21 to 27 used to reinforce the lower surface of the vehicle body 1 are used as an example of structural members made of fiber-reinforced resin, but the present invention is limited to this. does not receive For example, it can be used as a strut tower bridging between left and right suspension towers in the vehicle width direction.

In addition, in the present invention, the same effect as described above can be obtained by adopting a member having the above configuration as the structural member itself, in addition to the member for reinforcing a certain portion. For example, in the case of a vehicle body, it can be applied to roof side rails, center pillars, and even front pillars.

Moreover, the structural member having the above configuration can be applied not only to the vehicle bodies of automobiles, but also to various structural bodies (for example, industrial equipment, etc.).

In addition, in the above-described first to seventh embodiments, the bar members 210, 610, 710, 720, 730, 740, and 750 adopt substantially rectangular cross-sections. It is not limited to this. For example, the cross-sectional shape is not limited to a square, but may be a circle, an ellipse, an oval, or a polygonal cross section that is more polygonal than triangular or pentagonal.

Further, in the first to third embodiments, the bar members 210, 610, 710 are configured by the plurality of bar constituent members 213 to 216, 313, 413, 513, 613, 614, 713, 714. However, the present invention is not limited to this. For example, it is possible to employ a bar member integrally formed with one member.

Further, in the first embodiment to the ninth embodiment, the carbon fiber reinforced resin is adopted as an example of the fiber reinforced resin, but the present invention is not limited to this. For example, glass fiber reinforced resin (GFRP), aramid fiber reinforced resin (ArFRP), silicon carbide fiber reinforced resin (SiCFRP), and fiber reinforced resin using metal fibers such as non-ferrous metals can be used. be.

In addition, in the present invention, the bar-constituting member can be constructed using materials other than fiber-reinforced resin, such as aluminum alloys and steel materials.

Furthermore, in the present invention, one of the outer peripheral wall, which is the outer shell component, and the inner wall, which is the inner shell component, is configured using a fiber reinforced resin, and the other is configured using a material other than the fiber reinforced resin. can also

1 car body 21-27 reinforcement member (structural member)
210, 610, 710 Bar member 210a, 610a, 710a Internal space 210b to 210e, 610b to 610e, 710f, 720h, 720i, 730h, 730i, 740l to 740o, 750l to 750o, 760ab, 760ba, 760ca, 760da, 770d, 770e Internal closed section 213-216, 313, 413, 513, 613, 614, 713, 714, 720, 730, 740, 750, 760, 770 Bar component 213a-213b, 214a-214b, 313a, 413a, 513a , 613a-613b, 614a-614b, 713a-713b, 714a-714b, 720f, 720g, 730f, 730g, 740h-740k, 750h-750k, 760p-760z, 760aa Corners 213c-213e, 214c-214e, 613c- 613e, 614c to 614e, 713c to 713e, 714c to 714e, 720c to 720e, 730c to 730e, 740c to 740g, 750c to 750g, 760c to 760o, 770c Peripheral wall 215a to 215e, 216a to 216e, 613i to 613l, 614 ~ 614l, 713j ~ 713m, 720j ~ 720m, 730j, 730k, 740p ~ 740s, 750p ~ 750s, 760ac, 760bb, 760cb, 760db, 770f ~ 770k Inner wall 217 ~ 218, 617 ~ 618, 717 ~ 718 Adhesive layer (connection part)
2131 member (resin)
2132 carbon fiber (reinforced fiber)

Claims (11)

A long structural member extending in a predetermined direction,
a hollow bar member formed to extend in the longitudinal direction of the structural member ;
When the bar member is viewed in cross section in a direction orthogonal to the longitudinal direction, the outer peripheral wall of the bar member has an open cross-sectional shape with an opening in part,
an internal closed cross-sectional portion having a closed cross-sectional shape in a portion along the outer peripheral wall in the inner space of the bar member and at a position different from the opening ;
In the cross-sectional view, the bar member has a rectangular cross section, the outer peripheral wall has corners,
The internally closed cross-sectional part is provided with the corners of the quadrangular cross-section as ridgelines,
The opening is formed so as to be continuous in the longitudinal direction of the outer peripheral wall,
Structural member. A long structural member extending in a predetermined direction,
a hollow bar member formed to extend in the longitudinal direction of the structural member ;
When the bar member is viewed in cross section in a direction orthogonal to the longitudinal direction, the outer peripheral wall of the bar member has an open cross-sectional shape with an opening in part,
an internal closed cross-sectional portion having a closed cross-sectional shape in a portion along the outer peripheral wall in the inner space of the bar member and at a position different from the opening ;
In the cross-sectional view, the outer peripheral wall of the bar member has five or more corners,
The internally closed cross-sectional portion is provided with the corner as a ridgeline ,
The opening is formed so as to be continuous in the longitudinal direction of the outer peripheral wall,
Structural member. A long structural member extending in a predetermined direction,
a hollow bar member formed to extend in the longitudinal direction of the structural member ;
When the bar member is viewed in cross section in a direction orthogonal to the longitudinal direction, the outer peripheral wall of the bar member has an open cross-sectional shape with an opening in part,
an internal closed cross-sectional portion having a closed cross-sectional shape in a portion along the outer peripheral wall of the bar member in the inner space of the bar member and at a position different from the opening ;
In the cross-sectional view, the bar member has a substantially circular cross section, a substantially elliptical cross section, or a substantially medium circular cross section ,
The opening is formed so as to be continuous in the longitudinal direction of the outer peripheral wall,
Structural member. The structural member according to any one of claims 1 to 3,
In the cross-sectional view, the inner space of the internal closed cross-section portion is polygonal or arc-shaped,
Structural member. The structural member according to any one of claims 1 to 4,
In the cross-sectional view, the opening is provided only at one location on the outer peripheral wall,
Structural member. The structural member according to any one of claims 1 to 4,
In the cross-sectional view, the openings are provided at a plurality of locations on the outer peripheral wall,
In each of the openings provided at the plurality of locations, an adhesive layer that connects end portions of the outer peripheral wall that constitutes the opening is further provided,
In the cross-sectional view, the openings provided at the plurality of locations include a first opening and a second opening provided at positions separated from each other,
In the first opening, the first interval, which is the interval between the ends of the outer peripheral wall forming the first opening, is the interval between the ends of the outer peripheral wall forming the second opening. provided to be wider than the second interval,
Structural member. The structural member according to any one of claims 1 to 4,
In the cross-sectional view, the bar member has an outer shell constituting member having a wall constituting the outer peripheral wall, and an inner shell constituting member accommodated in the inner space of the outer shell constituting member,
The inner closed cross-sectional portion is provided between the inner wall surface of the outer shell constituting member and the outer wall surface of the inner shell constituting member,
Structural member. A long structural member extending in a predetermined direction,
a hollow bar member formed to extend in the longitudinal direction of the structural member ;
When the bar member is viewed in cross section in a direction orthogonal to the longitudinal direction, the outer peripheral wall of the bar member has an open cross-sectional shape with an opening in part,
an internal closed cross-sectional portion having a closed cross-sectional shape in a portion along the outer peripheral wall in the inner space of the bar member and at a position different from the opening ;
In the cross-sectional view, the bar member has an outer shell constituting member having a wall constituting the outer peripheral wall, and an inner shell constituting member accommodated in the inner space of the outer shell constituting member,
The inner closed cross-sectional portion is provided between the inner wall surface of the outer shell constituting member and the outer wall surface of the inner shell constituting member,
In the cross-sectional view, the outer shell constituent member is composed of a plurality of constituent members, and the inner shell constituent member is composed of a plurality of constituent members,
The inner closed cross-sectional portion is provided between the inner wall surface of the outer shell constituting member and the outer wall surface of the inner shell constituting member,
In the cross-sectional view, two of the plurality of structural members forming the outer shell structural member are arranged such that the outer opening of the outer shell structural member is provided between the ends thereof. is,
the opening is the outer opening;
In the cross-sectional view, two of the plurality of constituent members constituting the inner shell constituent member are arranged such that the inner opening of the inner shell constituent member is provided between end portions thereof, and , disposed inside the outer opening,
Each of the outer opening and the inner opening is formed so as to be continuous in the longitudinal direction,
Structural member. A structural member according to claim 7 or claim 8 ,
In the cross-sectional view,
The outer shell constituent member is composed of a first bar constituent member and a second bar constituent member, each of which has a hat-shaped cross-sectional shape and is arranged to face each other,
The inner shell constituent member is composed of a third bar constituent member and a fourth bar constituent member, each of which has a hat-shaped cross-sectional shape and is arranged to face each other.
Structural member. A structural member according to claim 9 , wherein
In the cross-sectional view, further comprising a connecting portion that connects between one end portions of the first bar component member and the second bar component member and between the other end portions,
The first bar-constituting member and the second bar-constituting member are arranged such that a first gap is provided between the one ends and a second gap narrower than the first gap is provided between the other ends. is placed facing the
The internal space is provided with a first internally closed cross-sectional portion on the one end side and a second internally closed cross-sectional portion on the other end side,
The closed cross-sectional area of the first internal closed cross-section is larger than the closed cross-sectional area of the second internal closed cross-section,
Structural member. In the structural member according to any one of claims 1 to 10 ,
The bar member is made of fiber reinforced resin,
Structural member.

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