JP2010274789A - Skeleton structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve a skeleton structure preventing or suppressing a resin sheet from flowing out between a metal insert and a skeleton member in molding process. <P>SOLUTION: The outside of the resin sheet 48 is coated with a coating member 50 composed of a composite material consisting of fiber and resin. The coating member 50, together with the metal insert 30 and the resin sheet 48, constitutes an insert body 52 buried within the skeleton member 22. In the molding process of the skeleton structure 20, the skeleton member 22 is cured after the resin sheet 48 is cured, thereby preventing or suppressing the resin sheet 48 from flowing out. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a skeleton structure including a skeleton member made of a composite material of fibers and resin.

  As the skeleton structure, a structure including a skeleton member made of a composite material of fibers and resin (for example, CFRP) is known (for example, see Patent Document 1). A metal insert may be disposed inside the skeleton member at a site where the attached component is fastened with such a structure.

  By the way, in such a structure, in order to suppress a peeling load due to a difference in linear expansion between the metal insert and the skeleton member, a structure in which a resin sheet is interposed in the entire region between the metal insert and the skeleton member (for example, Patent Document 2). It is conceivable that this applies.

JP 2008-215489 A JP 2006-297927 A

  However, in this structure, since the skeleton member and the resin sheet have different viscosities, the resin sheet flows out from between the metal insert and the skeleton member in the molding process.

  In view of the above facts, an object of the present invention is to obtain a skeleton structure capable of preventing or suppressing the resin sheet from flowing out between the metal insert and the skeleton member in the molding process.

  The skeletal structure of the present invention according to claim 1 is a skeletal member made of a composite material of fiber and resin, a metal insert disposed inside a part to which an attached part is attached in the skeleton member, and the skeletal member A resin sheet that covers the outside of the metal insert and a composite material of fiber and resin, covers the outside of the resin sheet, and together with the metal insert and the resin sheet, And a covering member constituting an insert body embedded therein.

  According to the skeletal structure of the present invention described in claim 1, the metal insert is arranged inside the part to which the attached component is attached in the skeleton member made of the composite material of fiber and resin. The outside of the metal insert is covered with a resin sheet disposed inside the skeleton member.

  Here, the outside of the resin sheet is covered with a covering member made of a composite material of fibers and resin, and the covering member constitutes an insert body embedded in the skeleton member together with the metal insert and the resin sheet. Yes. For this reason, in the molding process of the skeletal structure, first, the resin sheet on the metal insert is cured in a state of being covered with the covering member, and then the insert body configured to include the metal insert, the resin sheet, and the covering member. Embedded in the inside of the skeleton member, and when the skeleton member is cured in this state, the resin sheet is already cured when the skeleton member is cured. Outflow is prevented or suppressed.

  The skeleton structure according to a second aspect of the present invention is the structure according to the first aspect, wherein the metal insert is not covered by either the resin sheet or the covering member and faces the inner wall surface of the skeleton member. It has an opposing surface.

  According to the skeleton structure of the present invention described in claim 2, the facing surface of the metal insert is not covered by either the resin sheet or the covering member and faces the inner wall surface of the skeleton member. For this reason, in the process of forming the skeleton structure, the thickness of the resin sheet on the outer peripheral side of the facing surface of the metal insert is reduced when the insert body including the metal insert, the resin sheet, and the covering member is formed. It can be confirmed visually. That is, the molding condition of the resin sheet can be determined by the unit of the insert body.

  The skeleton structure of the present invention described in claim 3 is the structure according to claim 1 or 2, wherein the metal insert is not covered by either the resin sheet or the covering member and the skeleton member. The fastening surface that faces the opening is provided as a surface that receives a fastening load in a state in which the attached component is attached to the skeleton member by a fastener.

  According to the skeleton structure of the present invention described in claim 3, the fastening surface of the metal insert is not covered by either the resin sheet or the covering member and faces the opening of the skeleton member. It is a surface which receives a fastening load in the state which attached components to the member. For this reason, the attachment rigidity of the attached component is higher than, for example, a case where the attached component is attached to the fastening side surface of the skeleton member via the resin sheet and the covering member.

  The skeleton structure according to a fourth aspect of the present invention is the structure according to any one of the first to third aspects, in which the metal insert has a base toward the side on which the attached component is attached. It has a first overhang that forms an expanded shape.

  According to the skeleton structure of the present invention as set forth in claim 4, the first projecting portion of the metal insert has a shape with an expanded skirt toward the side to which the attached component is attached. For this reason, in the state in which the attached part is attached to the skeletal structure, the load from the attached part side to the metal insert side is dispersed, and the first overhanging portion is reduced by thinning the end of the first overhanging portion. Stress concentration at the end of the substrate is alleviated.

  A skeleton structure according to a fifth aspect of the present invention is the structure according to any one of the first to fourth aspects, wherein the metal insert is a surface portion directed toward a side to which the attached component is attached. A part of the wall surface that is substantially orthogonal to the inner wall surface is formed in a shape along the inner wall surface of the skeleton member, and has a second overhanging portion that has a shape with an expanded base toward the inner wall surface side.

  According to the skeleton structure of the present invention described in claim 5, the metal insert has a part of the wall surface substantially orthogonal to the surface portion directed to the side to which the attached component is attached along the inner wall surface of the skeleton member. A second projecting portion is formed which is formed in a shape and has a shape in which the skirt is widened toward the inner wall surface side. For this reason, in a state in which the attached component is attached to the skeleton structure, the load in the oblique direction from the attached component side to the metal insert side is dispersed, and the second extension portion is thinned to reduce the second portion. Stress concentration at the end of the overhang is alleviated.

  The skeleton structure of the present invention described in claim 6 is the structure according to any one of claims 1 to 5, wherein the metal insert is a surface portion directed to a side to which the attached component is attached. The surface portion on the opposite side of the frame is directly abutted against the inner wall surface of the skeleton member.

  According to the skeletal structure of the present invention described in claim 6, the metal insert has a surface portion opposite to the surface portion directed to the side to which the attached component is attached directly abutted against the inner wall surface of the skeleton member. Yes. For this reason, for example, even when a load acts from the mounted part side to the metal insert side and the metal insert and the resin sheet peel or when the insert body and the skeleton member peel, the metal inside the skeleton member The posture of the insert is maintained.

  According to a seventh aspect of the present invention, in the structure of the fourth aspect, the metal insert has a chamfered end on the projecting side of the first projecting portion.

  According to the skeletal structure of the present invention as set forth in claim 7, since the metal insert is chamfered at the end of the first overhanging portion, the covering member conforms to the shape of the end portion. Easy to place. For this reason, when arranging a covering member to form an insert body, a covering is provided between the covering member and the end portion on the overhang side of the first overhanging portion or the resin sheet covering the end portion. A gap due to a short circuit of the member (in other words, not to be arranged along the shape of the end portion of the first overhang portion) is less likely to occur, and as a result, the resin sheet due to the occurrence of the gap Outflow and movement of metal inserts are suppressed.

  The skeleton structure according to an eighth aspect of the present invention is the structure according to the fifth aspect, wherein the metal insert has a chamfered end portion on the overhang side of the second overhang portion.

  According to the skeletal structure of the present invention described in claim 8, since the metal insert has a chamfered end portion on the protruding side of the second protruding portion, the covering member conforms to the shape on the end portion side. Easy to place. For this reason, when arranging the covering member to form the insert body, the covering member is covered between the covering member and the end portion of the second protruding portion on the protruding side or the resin sheet covering the end portion. A gap due to a short circuit of the member (in other words, not to be arranged along the shape of the end of the second overhanging portion) is less likely to occur, and as a result, the resin sheet resulting from the occurrence of the gap Outflow and movement of metal inserts are suppressed.

  The skeleton structure according to a ninth aspect of the present invention is the structure according to any one of the first to eighth aspects, wherein a hollow hole is formed in the metal insert, and the hollow hole is Putty is buried.

  According to the skeletal structure of the present invention as set forth in claim 9, the metal insert is formed with the hole, and the hole is filled with the putty. For this reason, the metal insert is reduced in weight, and at the time of molding the insert body, the outflow of the resin sheet to the lightening hole is suppressed.

  As described above, according to the skeleton structure according to claim 1 of the present invention, the resin sheet can be prevented or suppressed from flowing out between the metal insert and the skeleton member in the molding process. Has an excellent effect.

  According to the skeleton structure of the second aspect, it has an excellent effect that the molding condition of the resin sheet can be determined by the unit of the insert body in the molding process.

  According to the skeleton structure of the third aspect, when the attached component is attached to the skeleton member by the fastener, there is an excellent effect that the attachment rigidity of the attached component can be secured.

  According to the skeleton structure of the fourth aspect, it is possible to disperse the load from the mounted part side to the metal insert side, and it is possible to reduce the thickness of the end portion of the first overhang portion by reducing the thickness of the end portion of the first overhang portion. It has an excellent effect that stress concentration at the end can be relaxed.

  According to the skeleton structure of the fifth aspect, the load in the oblique direction from the mounted component side to the metal insert side can be dispersed, and the second tension is reduced by thinning the end portion of the second extension portion. It has an excellent effect that stress concentration at the end of the protruding portion can be relaxed.

  According to the skeleton structure of the sixth aspect, even when the metal insert and the resin sheet are separated or when the insert body and the skeleton member are separated, the posture of the metal insert is maintained inside the skeleton member. It has an excellent effect of being able to.

  According to the skeletal structure of the seventh aspect, when the insert body is molded, the end portion on the overhang side of the first overhang portion, the resin sheet that covers the end portion, and the covering member are interposed. It is possible to suppress the generation of the gap, and in turn, the excellent effect that the outflow of the resin sheet due to the generation of the gap can be suppressed.

  According to the skeletal structure of the eighth aspect, when the insert body is molded, the end portion on the overhang side of the second overhang portion, the resin sheet covering the end portion, and the covering member are between It is possible to suppress the generation of the gap, and in turn, the excellent effect that the outflow of the resin sheet due to the generation of the gap can be suppressed.

  According to the skeletal structure of the ninth aspect, the metal insert can be reduced in weight, and at the same time as the insert body is molded, the resin sheet can be prevented from flowing out into the hollow holes.

1 is a perspective view showing a skeleton structure according to a first embodiment of the present invention. It is an expanded sectional view along line 2-2 in FIG. FIG. 3 is an enlarged cross-sectional view taken along line 3-3 in FIG. 1. It is a perspective view which shows the process until it shape | molds the insert body in the 1st Embodiment of this invention. FIG. 4 (A) shows a metal insert. FIG. 4B shows a state where a metal insert is coated with a resin sheet. FIG. 4C shows an insert body. It is a perspective view which shows the process until shape | molding the frame | skeleton structure in the 1st Embodiment of this invention. FIG. 5A is a perspective view showing a skeleton core component. FIG. 5B is a perspective view showing a skeleton core material. FIG. 5C is a perspective view showing a skeleton structure. It is sectional drawing which shows the procedure for arrange | positioning a stepped washer on the frame | skeleton member side in the 1st Embodiment of this invention. FIG. 6A shows a state before the countersinking process. FIG. 6B shows a state after the countersink machining. It is a typical perspective view showing a part of vehicle body rear part to which the frame structure concerning the 1st and 2nd embodiments of the present invention was applied. FIG. 8 is an enlarged sectional view taken along line 8-8 in FIG. FIG. 9 is an enlarged cross-sectional view taken along line 9-9 in FIG.

[First Embodiment]
A skeleton structure 20 according to a first embodiment of the present invention will be described with reference to FIGS. The skeletal structure 20 is used for a vehicle body skeleton. An arrow FR appropriately shown in these drawings indicates a vehicle front side in the assembled state of the skeleton structure 20, and an arrow UP indicates a set of the skeleton structure 20. The upper side of the vehicle in the attached state is shown, and the arrow IN shows the inner side in the vehicle width direction in the assembled state of the skeleton structure 20.

  FIG. 7 is a schematic perspective view showing a part of the vehicle body rear portion 10 to which the skeleton structure 20 is applied (a part on the right side of the vehicle). As shown in FIG. 7, the skeletal structure 20 (shown broken in the figure) constitutes a rear cross member arranged with the vehicle width direction as the longitudinal direction at the rear end of the vehicle body. It is spanned between rear ends of a pair of left and right vehicle body skeleton structures 60) which will be described in detail later. A rear end 12A of the rear suspension member 12 as a mounted part (fastened part) is fixed to both ends in the longitudinal direction of the skeleton structure 20 by fastening. The rear suspension member 12 is a heavy object having a relatively large weight and supports a rear suspension (not shown).

  1 is a perspective view of the skeleton structure 20, and FIG. 2 is an enlarged cross-sectional view of the fastening portion structure (attachment portion structure) of the skeleton structure 20 taken along line 2-2 in FIG. FIG. 3 is an enlarged cross-sectional view taken along line 3-3 in FIG.

  As shown in FIGS. 1 to 3, the skeleton structure 20 includes a skeleton member 22. The skeleton member 22 is a composite material formed by solidifying fibers (for example, carbon fibers) with a resin, that is, an FRP skeleton (for example, CFRP skeleton) made of fiber reinforced resin (FRP, for example, carbon fiber reinforced resin (CFRP)). ). In other words, the skeleton structure 20 is an FRP structure part (for example, a CFRP structure part).

  In addition, the skeleton member 22 constitutes the outline of the skeleton structure 20, and as shown in FIGS. 1 and 2, an upper wall 22A and a lower wall 22B that are opposed to each other in the vehicle body vertical direction in the assembled state. I have. The front end portion of the upper wall 22A and the front end of the lower wall 22B are connected by a front wall 22C, and the front wall 22C is a vehicle rear side in an assembled state from the upper wall 22A side to the lower wall 22B side. Slightly inclined. Also, the rear end portion of the upper wall 22A and the rear end of the lower wall 22B are connected by a rear wall 22D, and the rear wall 22D is in an assembled state from the upper wall 22A side to the lower wall 22B side. The vehicle is slightly inclined toward the vehicle front side. Further, as shown in FIG. 1, the side walls 22C, 22D, and the side walls of the lower wall 22B and the portions near the side edges of the upper wall 22A are connected by side walls 22E and 22F. As a result, the skeleton member 22 forms a trapezoidal frame-like closed cross-sectional structure.

  As shown in FIG. 2, a countersink hole 24A (penetrating part) as an opening is formed through a predetermined portion of the lower wall 22B, and the countersink hole 24A of the lower wall 22B is formed in the upper wall 22A. A through hole 24B (through portion) is formed in a part of the opposite position. The part where the counterbore 24A and the through hole 24B are formed in the skeleton member 22 is set corresponding to the part where the rear end 12A of the rear suspension member 12 which is a fastening part is fastened.

  The inside of the skeleton member 22 (inside the cross section) is filled with a foamed urethane core U (which is an element grasped as “foamed core material” in a broad sense, also referred to as “foamed urethane foam”), and this foamed material. A metal insert 30 made of metal (in this embodiment, made of an aluminum alloy) is disposed so as to be embedded in the urethane core U. The metal insert 30 corresponds to a portion corresponding to the portion where the counterbore 24A and the through hole 24B are formed in the skeleton member 22, in other words, inside the portion where the rear end 12A of the rear suspension member 12 is attached to the skeleton member 22. The upper wall 22A and the lower wall 22B of the skeleton member 22 are connected to each other.

  FIG. 4A shows an external perspective view of the metal insert 30. As shown in FIG. 4A, the metal insert 30 includes an insert main body 32 having a substantially cylindrical shape. The insert main body 32 bulges out in a substantially U shape from the side of the vertical wall surface 30A constituting the back side of the metal insert 30 in plan view, and as shown in FIG. It arrange | positions so that it may face the front wall 22C side of the frame member 22. FIG. That is, as shown in FIG. 2, the curved portion 32 </ b> A of the insert main body 32 is separated from the front wall 22 </ b> C of the skeleton member 22 and substantially along the bolt insertion hole 34 of the insert main body 32.

  As shown in FIG. 4A, the bolt insertion hole 34 of the insert main body portion 32 is formed so as to penetrate along the axial direction near the curved portion 32 </ b> A of the insert main body portion 32. A female screw portion (not shown) is formed on the inner surface of the bolt insertion hole 34 by a tap. As shown in FIG. 2, a shaft portion 14A of a bolt 14 as a fastener passing through the rear end portion 12A of the rear suspension member 12 is inserted into the bolt insertion hole 34 and screwed. Yes.

  When the bolt 14 is screwed into the female thread portion of the bolt insertion hole 34, the rear end portion 12A of the rear suspension member 12 has a head 14B of the bolt 14 and a stepped washer 40 (on the metal insert 30 side). Between the first and second embodiments (details will be described later).

  From the axial direction one end side of the insert main body part 32, the 1st overhang | projection part 36 is integrally extended in the direction which cross | intersects an axial direction. The first overhanging portion 36 has a shape in which the skirt is widened while being curved toward the side to which the rear suspension member 12 is attached, and is substantially U-shaped in plan view as shown in FIG. It has a shape.

  As shown in FIG. 2, the bottom surface 30 </ b> B of the metal insert 30 includes the bottom surface of the insert body portion 32 and the bottom surface of the first overhang portion 36, and the rear end portion 12 </ b> A of the rear suspension member 12 is The surface is directed to the side to be attached. On the bottom surface 30 </ b> B side, a concave recessed portion 130 </ b> B is formed on the outer peripheral side of the bolt insertion hole 34. A boss portion 40A of a stepped washer 40 is disposed in the recessed seat portion 130B.

  The stepped washer 40 is configured such that a flange 40B is coaxially and integrally extended from one axial end side of a boss portion 40A formed in a short cylindrical shape. The outer diameter of the boss portion 40A is set slightly smaller than the inner diameter of the recessed seat portion 130B, and the inner diameter is set slightly larger than the inner diameter (maximum diameter) of the bolt insertion hole 34. The outer diameter of the flange 40B is set to be sufficiently larger than the inner diameter of the recessed seat portion 130B, and is bonded to the lower wall 22B of the skeleton member 22 with an adhesive 42.

  Further, the metal insert 30 has a shape along the inner wall surface 122D of the rear wall 22D (outer peripheral wall) of the skeleton member 22 as shown in FIG. 3 in which the vertical wall surface 30A as a part of the wall surface substantially orthogonal to the bottom surface 30B. 3 and 4A, the rear wall 22D (outer peripheral wall) of the skeleton member 22 is curved toward the inner wall surface 122D side (in other words, the vertical wall surface 30A side). However, a second overhanging portion 38 having a shape with an expanded skirt is provided. Further, as shown in the partially enlarged view of FIG. 3, the metal insert 30 has a chamfered end portion on the overhang side of the second overhang portion 38 (the chamfer portion is denoted by reference numeral 38A).

  Further, as shown in FIGS. 2 and 3, a weight reduction hole 44 for weight reduction is formed in a predetermined portion (remaining portion) of the metal insert 30 so as to penetrate in a direction orthogonal to the axial direction. Further, in order to prevent a resin sheet 48 (described later in detail) surrounding the lightening hole 44 from flowing into the lightening hole 44, the lightening hole 44 is filled with a putty 46 that is lighter than the metal insert 30 (the putty is filled). ) As the putty 46, for example, ceramics or the like can be used.

  A resin sheet 48 that covers the outside of the metal insert 30 is disposed inside the skeleton member 22. In this way, the metal insert 30 is surrounded by the resin sheet 48 because the peeling stress generated by the difference in linear expansion between the metal insert 30 and the skeleton member 22 (for example, when cooling from the molding temperature of the skeleton member 22 to room temperature) is resinous. This is because the sheet 48 is absorbed by elastic deformation. The resin sheet 48 has a certain thickness to absorb the peeling stress.

  The outside of the resin sheet 48 is covered so as to be wrapped by the covering member 50. The covering member 50 is a composite material formed by solidifying fibers (for example, carbon fibers) with a resin, that is, an FRP layer (for example, a CFRP layer) made of a fiber reinforced resin (FRP, for example, a carbon fiber reinforced resin (CFRP)). ). The covering member 50 constitutes an insert body 52 (fiber reinforced resin insert, CFRP insert, see FIG. 4C) embedded in the skeleton member 22 together with the metal insert 30 and the resin sheet 48.

  In addition, the shape of the metal insert 30 is a shape provided with an R-shaped curved surface so that the base material of the covering member 50 can be easily attached. It can be affixed to the insert 30.

  As shown in FIG. 2, in the metal insert 30, the fastening surface 31 </ b> B constituting the bottom surface of the recessed seat portion 130 </ b> B is not covered by either the resin sheet 48 or the covering member 50, and the countersink hole 24 </ b> A of the skeleton member 22 is not covered. I'm here. In other words, the fastening surface 31B is exposed from the counterbore 24A before the stepped washer 40 is disposed (see FIG. 6B). The fastening surface 31 </ b> B of the metal insert 30 is a surface that receives a fastening load from the stepped washer 40 side in a state where the rear end 12 </ b> A of the rear suspension member 12 is attached to the skeleton member 22 by the bolt 14. Further, the metal insert 30 has an upper surface 30C as a surface facing the skeleton member 22 that is not covered by either the resin sheet 48 or the covering member 50 and is formed on the inner wall surface 122A of the upper wall 22A (outer peripheral wall) of the skeleton member 22. It is directly abutted against the inner wall surface 122A in an opposed state. The upper surface 30C is a surface opposite to the bottom surface 30B directed to the side on which the rear end portion 12A of the rear suspension member 12 is attached. On the other hand, the vertical wall surface 30 </ b> A of the metal insert 30 is joined to the inner wall surface of the skeleton member 22 via the resin sheet 48 and the covering member 50.

(Procedure of the skeletal structure and its action / effect)
Next, the procedure for forming the skeleton structure 20 will be described, and the operation and effect of the above embodiment will be described.

  In the process of forming the skeletal structure 20 shown in FIG. 1, first, the operator puts the outermost part of the metal insert 30 shown in FIG. 4A (the part excluding the upper surface 30C) into FIG. As shown in FIG. 4 (C), the base material of the covering member 50 is attached so that the resin sheet 48 is attached as shown in FIG.

  Here, as shown in FIG. 3, the end portion of the metal insert 30 on the overhang side of the second overhang portion 38 is covered only by the covering member 50, but the overhang side of the second overhang portion 38. Since the end portion is chamfered, the base material of the covering member 50 is easily arranged along the shape of the end portion side.

  For this reason, when sticking the base material of the covering member 50 in order to mold the insert body 52 shown in FIG. 4C, the end on the overhang side of the second overhang portion 38 shown in FIG. A gap (air gap) due to a short circuit (short) of the base material of the covering member 50 is less likely to occur between the resin sheet 48 covering the portion and the end portion and the base material of the covering member 50. In the drawing, the short-circuited position of the covering member in the comparison structure without the chamfered portion 38A is indicated by a two-dot chain line S as an example. Further, the insert body 52 is molded (cured) by applying pressure and heating in a state where the resin sheet 48 and the base material of the covering member 50 are coated on the outside of the metal insert 30. During smooth molding, the outflow of the resin sheet 48 and the movement of the metal insert 30 due to the generation of the gap are suppressed.

  Further, since the molding is performed in units of the insert body 52 (small component unit), the degree of freedom of the orientation of the molding target set in the mold at the time of molding is large. For this reason, it is possible to easily set the molding target in a direction in which the resin sheet 48 does not easily flow out.

  As shown in FIG. 4C, the insert body 52 is an exposed surface in which the upper surface 30 </ b> C of the metal insert 30 is not covered by either the resin sheet 48 or the covering member 50. For this reason, at the stage where the insert body 52 is formed, the plate thickness of the resin sheet 48 on the outer peripheral side of the upper surface 30C of the metal insert 30 can be visually confirmed. That is, the molding condition of the resin sheet 48 can be determined by the unit of the insert body 52. Therefore, even if the resin sheet 48 has a molding defect (a predetermined thickness cannot be ensured, etc.), it can be discarded in units of the insert body 52, and the entire skeletal structure 20 (see FIG. 1) can be discarded. Compared with cost advantage.

  Then, the insert body 52 and the foamed material of the foamed urethane core U shown in FIG. 5A are put in a mold and molded, so that the insert body 52 and the foamed urethane core U are ASSY, A skeleton core part 54A shown in FIG. 5A is formed. The skeletal core component 54A constitutes one side in the longitudinal direction of the skeleton core 54 shown in FIG. 5B, and symmetrical skeleton core components 54A and 54B are connected in series by an adhesive 56. By joining, the skeleton core material 54 is formed.

  Thereafter, the base material of the skeleton member 22 shown in FIG. 5C is attached to the outside of the skeleton core material 54 to embed the insert body 52 in the skeleton member 22, and in this state, pressurization and heating are performed. The skeleton structure 20 is formed by curing the skeleton member 22. Here, when the skeleton member 22 shown in FIG. 2 is cured, since the resin sheet 48 is already cured (previously), the outflow of the resin sheet 48 is prevented or suppressed (improvement of manufacturing quality). .

  Thereafter, a countersink process (machining) is performed on the lower side of the skeleton structure 20 shown in FIG. 6A (part indicated by a two-dot chain line B) to form a countersink shape. Finally, as shown in FIG. 6 (B), the stepped washer 40 is disposed so as to be fitted from below (from the direction of the arrow A) into the portion subjected to the countersink processing, so that the bottom of the skeleton member 22 is provided. It adhere | attaches on the wall 22B with the adhesive agent 42 (refer FIG. 2).

  As described above, according to the skeleton structure 20 according to the present embodiment, the resin sheet 48 is prevented or suppressed from flowing out between the metal insert 30 and the skeleton member 22 shown in FIG. be able to.

  Supplementally, in the contrast structure in which only the resin sheet is interposed between the CFRP skeleton member and the metal insert, the resin sheet is separated from the metal insert and the skeleton member in the molding process because the viscosity of the CFRP skeleton member and the resin sheet is different. It may flow out into the foam core or the screw hole of the metal insert from between the holes, and there is a possibility that an assembling defect or a deterioration in appearance may be brought about. On the other hand, in the skeletal structure 20 according to the present embodiment, since the skeleton member 22 is cured after the resin sheet 48 is first cured, the outflow of the resin sheet 48 when the skeleton member 22 is cured is prevented or It is suppressed.

  In the skeletal structure 20 according to the present embodiment, the fastening surface 31B of the metal insert 30 is not covered by any of the resin sheet 48 and the covering member 50 and faces the counterbore 24A of the skeleton member 22, and the bolt 14 is a surface that receives a fastening load in a state where the rear end portion 12 </ b> A of the rear suspension member 12 is attached to the skeleton member 22. For this reason, the mounting rigidity of the rear end portion 12A of the rear suspension member 12 is such that the rear end portion 12A of the rear suspension member 12 is attached to the fastening side surface of the skeleton member 22 via the resin sheet 48 and the covering member 50, for example. Higher than

  In the metal insert 30, since the resin sheet 48 is disposed outside the vertical wall surface 30 </ b> A, the resin sheet 48 prevents adhesion peeling due to a difference in linear expansion between the metal insert 30 and the skeleton member 22. .

  Further, in the skeletal structure 20 according to the present embodiment, the first projecting portion 36 of the metal insert 30 has a shape in which the skirt is widened while being curved toward the side to which the rear end portion 12A of the rear suspension member 12 is attached. There is no. As a result, the area of the fastening portion to which a large load is input is widened. Therefore, when the rear end portion 12A of the rear suspension member 12 is attached to the skeleton structure 20, the rear suspension member 12 is viewed from the rear end portion 12A side. The load on the metal insert 30 side is dispersed. Further, since the end portion of the first overhang portion 36 is thinned, the stress concentration on the end portion of the first overhang portion 36 is alleviated, and further, the weight can be reduced.

  Further, in the skeleton structure 20 according to the present embodiment, as shown in FIG. 3, the metal insert 30 is formed such that the vertical wall surface 30 </ b> A is shaped along the inner wall surface 122 </ b> D of the rear wall 22 </ b> D of the skeleton member 22. The 2nd overhang | projection part 38 has comprised the shape which extended the base, curving toward the inner wall surface 122D side (in other words, vertical wall surface 30A side) of the rear wall 22D of the frame member 22. As a result, the area of the vertical wall surface 30A is increased. Therefore, when the rear end portion 12A of the rear suspension member 12 shown in FIG. 2 is attached to the skeleton structure 20, the rear suspension member 12 is viewed from the rear end portion 12A side. An oblique load on the metal insert 30 side is dispersed by the vertical wall surface 30A. Further, since the end portion of the second overhang portion 38 shown in FIG. 3 is thinned, the stress concentration on the end portion of the second overhang portion 38 is alleviated. In addition, by curving the curved portion 32 </ b> A without being along the front wall 22 </ b> C of the skeleton member 22, significant weight reduction can be achieved.

  Further, in the skeleton structure 20 according to the present embodiment, as shown in FIG. 2, the upper surface 30 </ b> C of the metal insert 30 is directly abutted against the inner wall surface 122 </ b> A of the upper wall 22 </ b> A of the skeleton member 22. For this reason, for example, when a load acts from the rear end 12A side of the rear suspension member 12 to the metal insert 30 side and the metal insert 30 and the resin sheet 48 are separated, the insert body 52 (the covering member 50) and the skeleton member Even when 22 is peeled off, the posture of the metal insert 30 inside the skeleton member 22 is maintained (in other words, falling is suppressed).

  Further, in the skeletal structure 20 according to the present embodiment, the metal insert 30 is formed with a lightening hole 44 and the lightening hole 44 is filled with a putty 46 that is lighter than the metal insert 30 (filled with putty). Yes. For this reason, the metal insert 30 is reduced in weight, and at the time of molding the insert body 52, the resin sheet 48 is prevented from flowing out into the hollow hole 44.

  Supplementally, since a large load is input to the fastening portion with the rear suspension member 12 in the skeletal structure 20, rigidity of a predetermined value or more is required in this portion. However, in the skeleton structure 20 according to the present embodiment, High rigidity can be secured by the metal insert 30 reduced in weight. For this reason, it is not necessary to impair the advantages (high rigidity and light weight) of the CFRP body by applying the skeleton structure 20 to the vehicle body.

[Second Embodiment]
Next, a skeleton structure 60 according to a second embodiment of the present invention will be described with reference to FIGS. FIG. 8 shows a fastening part structure (attachment part structure) of the skeletal structure 60 in an enlarged cross-sectional view along line 8-8 in FIG. 7, and FIG. 9 shows a fastening part structure of the skeleton structure 60. (Attachment structure) is shown in an enlarged cross-sectional view along line 9-9 in FIG.

  As shown in FIG. 7, the skeletal structure 60 constitutes a rear side member whose longitudinal direction is substantially the vehicle front-rear direction on both sides of the rear part of the vehicle body. 7 to 9, components that are substantially the same as those of the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 7, the skeletal structure 60 includes an elongated skeleton member 62 having a substantially rectangular closed cross section. Similar to the skeleton member 22, the skeleton member 62 is an FRP skeleton (for example, a CFRP skeleton) made of a composite material in which fibers (for example, carbon fibers) are solidified with a resin.

  Inside the skeleton member 62, a first insert body 64 and a second insert body 66 are embedded as insert bodies near the inner side in the vehicle width direction on the rear side. In the first insert body 64, the first fastened portion 12C on the front end side of the rear suspension member 12 is fixed by fastening. Since the structure of the first insert body 64 is substantially the same as that of the insert body 52 (see FIGS. 2 and 3) in the first embodiment, the description thereof is omitted.

  The second insert body 66 arranged on the vehicle rear side with respect to the first insert body 64 is an absorber 58 as a mounted part (fastened part) (a part schematically shown in the drawing is indicated by a two-dot chain line). A metal insert 70 for fixing by fastening and a metal insert 68 for fixing the second fastened portion 12B of the rear suspension member 12 by fastening are provided. Since the metal inserts 68 and 70 are relatively close to each other, they are collectively embedded in one second insert body 66, thereby reducing the number of parts. The absorber 58 is a component of the suspension, and a large load is input to the fastening portion of the absorber 58.

  As shown in FIG. 9, the metal insert 68 has substantially the same configuration as that of the metal insert 30 (see FIG. 2) except for the points described below. Therefore, in the metal insert 68, about the structural part substantially the same as the metal insert 30 (refer FIG. 2), the same code | symbol is attached | subjected and description is abbreviate | omitted. In the metal insert 68, a bolt insertion portion 34A is formed instead of the bolt insertion hole 34 (see FIG. 2). The bolt insertion portion 34A has the same configuration as the bolt insertion hole 34 (see FIG. 2) except that it does not penetrate to the upper surface 30C side.

  Further, the metal insert 68 has a large chamfered end portion of the first overhang portion 36 (the chamfer portion is indicated by 36A). By forming the chamfered portion 36 </ b> A at the end portion of the metal insert 68 on the overhang side of the first overhang portion 36, the operator can attach the base material of the covering member 50 to the overhang side of the first overhang portion 36. It is easy to paste along the shape of the end side. For this reason, when sticking the base material of the covering member 50 in order to form the second insert body 66, the end of the first overhanging portion 36 and the resin sheet 48 covering the end In addition, a gap (gap) due to a short circuit (short) of the base material of the covering member 50 is less likely to occur between the base material of the covering member 50, and consequently, the outflow of the resin sheet 48 due to the occurrence of the gap is suppressed. Is done.

  Further, as shown in FIG. 8, the metal insert 70 for fixing the attached portion 58A of the absorber 58 by fastening is substantially the same as the metal insert 68 (see FIG. 9) except for the points described below. It is configured. Therefore, in the metal insert 70, about the structural part substantially the same as the metal insert 68 (refer FIG. 2), the same code | symbol is attached | subjected and description is abbreviate | omitted.

  The metal insert 70 includes an insert body portion 72 corresponding to the insert body portion 32 (see FIG. 9). The insert main body 72 protrudes so that the lower side is separated from the vertical wall surface 30 </ b> A rather than the upper side, and forms a step shape in a sectional view of FIG. 8. The insert main body 72 has a bolt insertion portion 34 </ b> B formed at a portion disposed on the outer side in the vehicle width direction on the lower side. The bolt insertion part 34B has the same configuration as the bolt insertion part 34A (see FIG. 9).

  In addition, the insert main body 72 has a portion on the vertical wall surface 30 </ b> A side that can be fastened with a mounted part, and a bolt insertion portion 34 </ b> C is formed from the vertical wall surface 30 </ b> A side. The bolt insertion portion 34C has the same configuration as the bolt insertion portion 34B except that the direction perpendicular to the axial direction of the bolt insertion portion 34B is the axial direction.

  Further, a concave recessed seat portion 130A is formed on the outer peripheral side of the bolt insertion portion 34C on the vertical wall surface 30A side, and is used for disposing the boss portion 40A of the stepped washer 40. The fastening surface 31 </ b> A constituting the bottom surface of the recessed seat portion 130 </ b> A is not covered by either the resin sheet 48 or the covering member 50 and faces the counterbore hole 62 </ b> A as an opening portion of the skeleton member 62.

  Also by the configuration of the present embodiment described above, the same operations and effects as those of the first embodiment described above can be obtained.

[Supplementary explanation of the embodiment]
In the above embodiment, the rear suspension member 12 and the absorber 58 as attached parts are fixed to the skeleton structures 20 and 60 by fastening, but the attached parts are engaged with the skeleton structure, for example. It may be a mounted part attached by, for example.

12 Rear suspension member (attached parts)
14 bolts (fasteners)
20 skeleton structure 22 skeleton member 24A counter bore (opening)
30 Metal insert 30B Bottom surface (surface portion directed to the side on which the part to be attached is attached)
30C Upper surface (opposite surface, opposite surface)
31A Fastening surface 31B Fastening surface 36 First overhanging portion 38 Second overhanging portion 44 Mouth hole 46 Putty 48 Resin sheet 50 Cover member 52 Insert body 58 Absorber (attached part)
60 skeleton structure 62 skeleton member 62A counter bore (opening)
64 First insert body (insert body)
66 Second insert body (insert body)
68 Metal insert 70 Metal insert

Claims (9)

A skeleton member made of a composite material of fiber and resin;
A metal insert disposed inside a part to which the attached component is attached in the skeleton member;
A resin sheet disposed inside the skeleton member and covering the outside of the metal insert;
A covering member that is made of a composite material of fiber and resin, covers the outside of the resin sheet, and constitutes an insert body embedded in the skeleton member together with the metal insert and the resin sheet;
A skeleton structure having   The skeleton structure according to claim 1, wherein the metal insert includes a facing surface that is not covered by any of the resin sheet and the covering member and faces an inner wall surface of the skeleton member.   The metal insert includes a fastening surface that is not covered by either the resin sheet or the covering member and faces the opening of the skeleton member, and the fastening surface attaches the attached component to the skeleton member by a fastener. The skeletal structure according to claim 1, wherein the skeleton structure is a surface that receives a fastening load in an attached state.   The said metal insert is provided with the 1st overhang | projection part which makes the shape which extended the base toward the side to which the said to-be-attached component is attached, The frame structure as described in any one of Claims 1-3. .   The metal insert is formed such that a part of a wall surface substantially orthogonal to a surface portion directed to a side on which the mounted component is mounted is formed in a shape along the inner wall surface of the skeleton member, and toward the inner wall surface side. The skeletal structure according to any one of claims 1 to 4, further comprising a second projecting portion having a shape with an expanded base.   The metal insert has a surface portion opposite to a surface portion directed to a side to which the attached component is attached, directly abutted against an inner wall surface of the skeleton member. The skeleton structure described in 1.   The skeleton structure according to claim 4, wherein the metal insert has a chamfered end portion of the first overhang portion.   The skeleton structure according to claim 5, wherein the metal insert has a chamfered end portion of the second overhang portion.   The skeletal structure according to any one of claims 1 to 8, wherein a hollow hole is formed in the metal insert, and the hollow hole is filled with putty.

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