JP2008037316A - Integrated type fiber-reinforced resin member for vehicle body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an integrated type fiber-reinforced resin member for a vehicle body in which a load can be dispersed so as not to be concentrated to a part of the member. <P>SOLUTION: (1) The integrated type fiber-reinforced resin member 10 for a vehicle body comprises a single skeleton part 23 comprising a skeleton part 20 extended along a length from one end 21 of the length to a branch 22, and a plurality of branch skeleton parts 24, 25, and 26 extended from the branch 22 toward the other end of the length. In the structure, the concentration of the load can be prevented. (2) The part between at least the two branch skeleton parts 24 and 25 is composed of a combined part 30 of a pair of side walls 28. The branch skeleton parts 24 and 25 can be easily separated from each other. (3) Inner ribs 36 are provided at parts of the two branch skeleton parts 25 and 26. The branch skeleton parts 25 and 26 can be easily separated from each other. (4) Through holes 37 are formed at the combined part 30. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an integrated member made of fiber reinforced resin (FRP) for a vehicle body. The FRP member of the present invention can be applied to, for example, a rear side member of an integrated lower body (also referred to as underday) of a vehicle body.

Patent Document 1 discloses using a CFRP (carbon fiber reinforced resin) material as an energy absorbing member. As shown in FIG. 9, the CFRP material 1 does not have a structure that branches into a transverse section, but is cylindrical (FIG. 9 (A)), columnar (FIG. 9 (B)), or conical (FIG. 9 ( C)). Further, the cylindrical CFRP material 1 does not have a through hole 2 as shown in FIG.
Patent Document 2 discloses the use of a CFRP material for a truck floorboard.
Japanese Patent Application No. 2004-116564 Japanese Patent Laid-Open No. 10-129537

When the conventional fiber reinforced resin material technology is applied to an integrated fiber reinforced resin lower body for a vehicle body, for example, to a rear side member portion extending from the B pillar to the rear of the vehicle, the following problems arise.
(A) The load applied to the rear side member, that is, the axial compressive load at the time of rear collision or the bending direction load from the suspension spring concentrates on the joint part of the support part of the rear side member and the B pillar, and is applied to the support part and the joint part. There arises a problem that the strength and rigidity are insufficient, and if sufficient strength and rigidity are secured in the support part and the joint part, problems arise in that the support part and the joint part are enlarged and weight is increased.
(B) If a hole (for example, a hole through which an inlet pipe for refueling is inserted) is provided in the support part and the joint part of the rear side member, the strength and rigidity of the support part and the joint part are lowered. It becomes impossible to arrange, mount, and package the lower body with a member inserted through the hole.

An object of the present invention is to provide an integrated fiber reinforced resin member for a vehicle body that can be dispersed so that a load is not concentrated on a part of the member.
Another object of the present invention is that the member can be provided with holes so that the load can be distributed so as not to be concentrated on a part of the member and the strength and rigidity of the member are not lowered. The object is to provide an integrated fiber reinforced resin member for a vehicle body.

The present invention for solving the above problems or achieving the above object is as follows.
(1) An integrated fiber reinforced resin member for a vehicle body that constitutes a part of a lower body of a vehicle body, and has a bone portion extending in a longitudinal direction formed from an outer wall made of fiber reinforced resin, A single bone part extending from one longitudinal end of the bone part to a branch part in the longitudinal direction of the bone part, and branched from the branch part toward the other longitudinal end of the bone part A plurality of branch bone portions extending, and the plurality of branch bone portions are separated from each other in a direction perpendicular to the longitudinal direction of the bone portion, and at least partially have parallel portions that are substantially parallel to each other. Integrated fiber reinforced resin member.
(2) The outer wall made of fiber reinforced resin has a pair of side walls, and a portion between at least two branch bone portions of the plurality of branch bone portions is overlapped with the pair of side walls approaching each other. The integrated fiber reinforced resin member for a vehicle body according to (1), comprising an overlapping portion.
(3) The outer wall made of fiber reinforced resin has a pair of side walls, and an inner rib extending between the pair of outer walls is provided at a position of at least two branch bone portions of the plurality of branch bone portions ( An integrated fiber reinforced resin member for a vehicle body according to 1) or (2).
(4) The integrated fiber reinforced resin member for a vehicle body according to (2), wherein a through hole is provided in the overlapping portion.

  According to the integrated fiber reinforced resin member for vehicle body of (1) above, the integrated fiber reinforced resin member for vehicle body has a bone portion extending in the longitudinal direction formed from the outer wall made of fiber reinforced resin, and the bone portion Is a single bone portion that extends from one end in the longitudinal direction of the bone portion to a branch portion in the middle of the longitudinal direction of the bone portion, and a plurality of branches that branch off at the branch portion and extend from the branch portion toward the other longitudinal end of the bone portion Since the plurality of branch bone parts are separated from each other in a direction perpendicular to the longitudinal direction of the bone part and have parallel parts at least partially parallel to each other, input from a single bone part Load (an axial load and / or a bending load that is a load in a direction perpendicular to the axial direction) is distributed to the bifurcated bone portion, and a member portion (for example, The load concentrates at the joint between the B-pillar) and the bifurcated bone Door is eliminated. As a result, when the load is concentrated on a part of the member (for example, when the load is concentrated on the side member and the joint between the side member and the B pillar), the strength of the part of the member on which the load is concentrated, The problem of lack of rigidity is solved.

  According to the (2) vehicle body integrated fiber reinforced resin member, the outer wall made of fiber reinforced resin has a pair of side walls, and a portion between at least two branch bone portions of the plurality of branch bone portions is Since it is composed of a superposed portion in which a pair of side walls are brought close to each other, the superposed portion divides the cross section of the member into two parts and easily forms two bifurcated bone parts. Can do.

  According to the above-mentioned integrated fiber reinforced resin member for a vehicle body of (3), the outer wall made of fiber reinforced resin has a pair of side walls, and a pair of at least two branch bone portions among the plurality of branch bone portions is provided. Since the inner ribs extending between the outer walls of the two branch ribs are provided, the two inner ribs adjacent to each other out of the two branch bones divide the cross section of the member into two parts and easily form two branch bones can do.

  According to the (4) vehicle body integrated fiber reinforced resin member, since the overlap portion is provided with a through hole, the overlap portion has higher strength and rigidity than a single outer wall portion. The member can be provided with a hole with almost no decrease in strength and rigidity of the member.

  Below, the integrated fiber reinforced resin member for vehicle bodies of this invention is demonstrated with reference to FIGS.

  As shown in FIG. 1, the integrated fiber reinforced resin member 10 for a vehicle body according to the present invention is, for example, a part of an integrated lower body 11 of a vehicle body, for example, a rear side member 15, provided at an end in the width direction of the vehicle body. Configure. However, a part of the vehicle body integrated lower body 11 may be a part of the lower body 11 other than the rear side member 15.

  A part of the integrated lower body 11 of the vehicle body has an outer wall 27 formed of fiber reinforced resin. The vehicle body integrated lower body 11 includes an A pillar 12 extending in the vertical direction from the front to the rear of the vehicle, a rocker 13 extending from the A pillar 12 to the rear of the vehicle, and a B pillar 14 extending obliquely upward and rearward from the rear end of the rocker 13. , A rear side member 15 extending rearward from the B pillar 14. The A pillar 12, the rocker 13, the B pillar 14, and the rear side member 15 are integrally formed with each other. The A pillar 12, the rocker 13, the B pillar 14, and the rear side member 15 have outer walls formed of fiber reinforced resin.

  As shown in FIGS. 1 and 2, the rear side member 15 is positioned between the load containing portion 16 extending substantially horizontally in the vehicle front-rear direction, and between the load containing portion 16 and the B pillar 14 and supports the load containing portion 16. A support part 17 is provided. The support portion 17 transmits the load from the load containing portion 16 to the B pillar 14. An axial compression load 18 is applied to the load containing portion 16 at the time of rearward collision of the vehicle, and a load 19 of the suspension spring enters a direction substantially orthogonal to the load containing portion 16. The load 19 of the suspension spring acts as a bending load 19 on the loaded portion 16 and the support portion 17.

  As shown in FIG. 2 to FIG. 8, the integrated fiber reinforced resin member 10 for a vehicle body has a longitudinally extending bone portion formed from an outer wall made of fiber reinforced resin (between a pair of side walls 28 separated from each other and the side walls). A transverse wall (which may be a bent lateral wall as shown in FIG. 5) 29 or an inner rib 36 has a quadrilateral or polygonal skeleton portion 20. The bone part 20 includes a single bone part 23 extending from one longitudinal direction end 21 of the bone part to a branch part 22 in the middle of the longitudinal direction L of the bone part 20 and a branch part 22 branched from the branch part 22 to the bone part. A plurality of bifurcated bone portions 24, 25, 26 extending toward the other end in the longitudinal direction (the coupling end with the B pillar 14) (in the illustrated example, the case where there are three bifurcated bone portions is shown. As many as possible). When the branch bone parts 24, 25, 26 are branched at one point, the branch part 22 is one point, but when the branch bone parts 24, 25, 26 are not branched at one point, the branch part 22 is a single point. The bone portion 23 has a length parallel to the longitudinal direction. For example, the branch point 22a between the branch bone part 24 and the branch bone part 25 and the branch point 22b between the branch bone part 25 and the branch bone part 26 are offset in a direction parallel to the longitudinal direction of the single bone part 23. In the case where the bifurcation 22 is present, the bifurcation 22 is parallel to the longitudinal direction of the single bone 23, the bifurcation 22 a between the bifurcation 24 and the bifurcation 25, and the bifurcation between the bifurcation 25 and the bifurcation 26. It has a length corresponding to the distance from 22b. The single bone portion 23 is located in the loaded portion 16, and the plurality of branch bone portions 24, 25, and 26 are located in the support portion 17. In the illustrated example, one of the plurality of branch bone parts 24, 25, 26 (for example, the center branch bone part 25 in the vertical direction, but is not limited to the center branch bone part 25). , In front of the single bone part 23. Also, the rear end of one of the plurality of branch bone parts 24, 25, 26 (for example, the center branch bone part 25 in the vertical direction, but not limited to the center branch bone part 25) The cross section of the portion overlaps in the vehicle front-rear direction in the vehicle front-rear direction, in the cross section of the front end portion of the single bone portion 23 and at least a part of the cross section (or the entire cross section).

  The plurality of branched bone portions 24, 25, 26 are separated from each other in a direction T perpendicular to the longitudinal direction L of the bone portion, and at least partially include parallel portions 24a, 25a, 26a extending substantially parallel to each other. In the branched bone portions 24 and 26 other than the branched bone portion 25 overlapping the single bone portion 23 in the vehicle longitudinal direction, the parallel portions 24a and 26a are connected to the branched portion 22 via the inclined bone portions 24b and 26b inclined from the horizontal direction. Connected. The plurality of branched bone portions 24, 25, and 26 are integrally coupled to the B pillar 14 at the front ends of the parallel portions 24a, 25a, and 26a.

  An outer wall 27 formed of a fiber reinforced resin, which is a part of the integrated lower body 11 of the vehicle body, has a pair of side walls 28 extending substantially in the vertical direction and a lateral wall 29 extending between the pair of side walls 28. The lateral wall 29 includes a ceiling wall and a bottom wall of the outer wall 27. The pair of side walls 28 are separated from each other in the horizontal direction at the site of the branch bone portions 24, 25, 26 and the single bone portion 23.

  As shown in FIGS. 4 and 5, of the outer wall 27 formed of fiber reinforced resin, a portion between at least two branch bone portions 24, 25 among the plurality of branch bone portions 24, 25, 26 is a pair. The side wall 28 is bent so as to be close to each other and overlapped with each other. The overlapping portion 30 extends substantially in the vertical direction. In the overlapping portion 30, the pair of side walls 28 are in close contact with each other. In this close contact portion, the pair of side walls 28 may be fused to each other, or may be merely in contact and not fused. Due to the presence of the overlapping portion 30 in the portion between the two branch bone portions 24, 25, the horizontally extending parallel portions 24a, 25a of the two branch bone portions 24, 25 are separated from each other in the vertical direction. standing. The two branched bone portions 24 and 25 are not necessarily divided from each other in the vertical direction in the inclined bone portions 24b and 26b. In the example shown in the figure, a foam core is contained inside the two branch bone portions 24 and 25 and becomes a core (core) when the outer wall 27 is formed. In the overlapping portion 30, the pair of side walls 28 are heat-sealed to each other. Indicates the case. However, the inside of the two branched bone portions 24 and 25 may be hollow, or the pair of side walls 28 may be in contact with each other in the overlapping portion 30 without being thermally fused.

  As shown in FIG. 6 and FIG. 7, the fiber reinforced resin is provided at the site of at least two branch bone portions 25, 26 among the plurality of branch bone portions 24, 25, 26 of the outer wall 27 formed of fiber reinforced resin. A hollow member 32 having a rectangular cross section formed from the above is provided between the pair of outer walls 28 of the outer wall 27. The hollow members 32 at least two branch bone portions 25 and 26 are connected to each other at the branch portion 22. The rectangular hollow member 32 has an upper wall 33, a lower wall 34, and a pair of side walls 35. The pair of side walls 35 are fused and integrated with a pair of side walls 28 of the outer wall. The upper wall 33 and the lower wall 34 of the hollow member 32 extend substantially horizontally between the pair of side walls 35 and between the pair of outer walls 28 of the outer wall 27 to form inner ribs 36.

  The lower wall 34 of the hollow member 32 provided in the upper branching bone portion 25 of the branching bone portions 25 and 26 adjacent in the vertical direction and the lower branch of the branching bone portions 25 and 26 adjacent in the vertical direction. The upper wall 33 of the hollow member 32 provided in the bone part 26 is separated in the vertical direction, and the space between the two may be hollow or a foam core may be inserted. With this structure, the branch bone portions 25 and 26 adjacent in the vertical direction are separated from each other in the vertical direction in the parallel portions 25a and 26a, and are divided in the vertical direction.

  The parallel portions 24a, 25a, 26a of the plurality of branched bone portions 24, 25, 26 may be divided in the vertical direction by the structure of FIG. 4 and FIG. 5 (structure having the overlapping portion 30), or FIG. 7 may be divided in the vertical direction by the structure of FIG. 7 (structure having the inner rib 36), or as shown in FIG. 2, some of the parallel portions 24a and 25a are vertically moved by the structure having the overlapping portion 30. The remaining parallel portions 25a and 26a may be divided in the vertical direction by the structure having the inner ribs 36.

As shown in FIG. 8, in the structure having the overlapping portion 30, a through hole 37 may be provided in the overlapping portion 30. However, the through hole 37 is not necessarily provided. The through hole 37 is inserted with an inlet pipe to the fuel tank or an electric or electronic wire harness. It is desirable that the reinforcing fibers (carbon fibers or glass fibers) of the fiber reinforced resin are connected as much as possible at the through hole 37 portion of the overlapping portion 30 so that the reinforcing fibers are not cut.
A through hole may be provided in the structure of FIG. 6 and FIG. 7 (structure having the inner rib 36), but in that case, it is provided at a site between the adjacent branch bone parts 25 and 26, and the branch bone part 25, It is desirable not to provide a through hole in the wall 26.

Next, the operation and effect of the integrated fiber reinforced resin member for vehicle body of the present invention will be described.
The integrated fiber reinforced resin member 10 for a vehicle body of the present invention has a bone portion 20 extending in the longitudinal direction formed from an outer wall 27 made of fiber reinforced resin, and the bone portion 20 extends from one longitudinal end 21 of the bone portion 20. A single bone portion 23 extending to the branch portion 22 in the middle of the bone portion 20 in the longitudinal direction, and a plurality of branch bone portions 24 branched from the branch portion 22 and extending toward the other longitudinal end of the bone portion. 25, 26, and the plurality of branch bone portions 24, 25, 26 are separated from each other in a direction T perpendicular to the bone portion longitudinal direction L, and at least partially parallel portions 24a, 25a, 26a.

  With this structure, the load (the axial load 18 and / or the bending load 19 that is a load perpendicular to the axial direction) input from the single bone portion 23 is distributed to the branch bone portions 24, 25, and 26. Then, a load is applied to the branch bone portions 24, 25, 26, and the connecting portions of the member portions (for example, the B pillar 14) connected to the branch bone portions 24, 25, 26 and the branch bone portions 24, 25, 26. Concentration is lost. As a result, when the load is concentrated on a part of the member (for example, when the load is concentrated on the joint portion between the rear side member 15 and the B pillar 14), the strength and rigidity of the part of the member on which the load is concentrated. The lack of problem is solved.

  The outer wall 27 made of fiber reinforced resin has a pair of side walls 28, and a portion between at least two branch bone portions 24, 25 among the plurality of branch bone portions 24, 25, 26 has a pair of side walls 28. In the case where the overlapping portion 30 is configured to be close to each other and overlapped, the overlapping portion 30 divides the cross section of the member into two parts, so that two branched bone parts 24 and 25 are formed. be able to.

  Further, the outer wall 27 made of fiber reinforced resin has a pair of side walls 28, and extends between the pair of outer walls 28 in at least two branch bone portions 25, 26 among the plurality of branch bone portions 24, 25, 26. When the inner rib 36 is provided, two inner ribs 36 (the lower wall 34 of the upper hollow member 32 and the upper wall 33 of the lower hollow member 32) adjacent to each other out of the two branch bone portions 25 and 26. Since the cross section of the member is divided into two parts, the two bifurcated bone parts 25 and 26 can be easily formed.

  Further, when the through hole 37 is provided in the overlapping portion 30, the overlapping portion 30 is higher in strength and rigidity than one outer wall portion, so that the strength and rigidity of the member are hardly reduced. The member 10 can be provided with a hole 37. When the holes 37 are provided, the strength and rigidity of the member can be maintained at the same level as when the holes are not provided by orienting the fibers so that the reinforcing fibers of the fiber reinforced resin are not cut. Moreover, since the freedom degree which provides the hole 37 increases, it becomes easy to arrange | position the inlet pipe connected to a fuel tank, or a wire harness.

It is a perspective view of the vehicle body which attached the integrated lower body containing the member made from an integrated fiber reinforced resin for vehicle bodies of this invention. It is a side view of the integrated fiber reinforced resin member for vehicle bodies of FIG. FIG. 2 is a side view of a portion including a single bone portion and a plurality of branched bone portions of the vehicle body integrated fiber reinforced resin member of FIG. 1. FIG. 2 is a perspective view of a portion including a single bone portion and a plurality of branched bone portions divided in an up-down direction at an overlapping portion of the vehicle body integrated fiber reinforced resin member of FIG. 1. It is the sectional view on the AA line of FIG. FIG. 2 is a perspective view of a portion including a single bone portion and a plurality of branch bone portions divided in the vertical direction by inner ribs of the vehicle body integrated fiber reinforced resin member of FIG. 1. It is the BB sectional view taken on the line of FIG. It is an expanded sectional view in a through-hole site | part at the time of providing a through-hole in the overlap part of the integrated fiber reinforced resin member for vehicle bodies of FIG. It is a perspective view of the conventional CFRP material which does not have the structure branched in a cross section, (A) shows cylindrical CFRP material, (B) shows columnar CFRP material, (C) shows conical CFRP. Indicates the material. It is a perspective view at the time of providing the through-hole in the wall of the conventional cylindrical CFRP material which does not have a structure branched in a cross section.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Integrated fiber reinforced resin member 11 for vehicle body Integrated lower body 12 A pillar 13 Rocker 14 B pillar 15 Rear side member 16 Loaded portion 17 Supporting portion 18 Axial compressive load 19 Load from suspension spring (bending load)
20 Bone 21 Longitudinal end 22 of the bone part 22 Branch part 22a Branch point 22b between the branch bone part 24 and the branch bone part 25 Branch point 23 between the branch bone part 25 and the branch bone part 26 Single bone parts 24, 25, 26 A plurality of branched bone portions 24 a, 25 a, 26 a Parallel portions 24 b, 25 b, 26 b Inclined bone portions 27 Outer walls 28 A pair of side walls 29 A lateral wall 30 An overlapping portion 32 A hollow member 33 An upper wall 34 A lower wall 35 A pair of side walls 36 An inner rib 37 Through-hole L Longitudinal direction T of bone part Direction perpendicular to longitudinal direction of bone part

Claims (4)

  An integrated fiber reinforced resin member for a vehicle body that constitutes a part of a lower body of a vehicle body, and has a bone portion extending in a longitudinal direction formed from an outer wall made of fiber reinforced resin, wherein the bone portion is the bone portion A single bone part extending from one longitudinal end of the bone part to a branch part in the middle of the longitudinal direction of the bone part, and a plurality of branches branched from the branch part and extending from the branch part toward the other longitudinal end of the bone part An integrated fiber for a vehicle body having a branching bone part, wherein the plurality of branching bone parts are separated from each other in a direction perpendicular to the longitudinal direction of the bone part, and at least partially have parallel parts. A member made of reinforced resin.   The outer wall made of fiber reinforced resin has a pair of side walls, and a portion between at least two branch bone portions among the plurality of branch bone portions is an overlapped portion in which the pair of side walls are brought close to each other to overlap each other. The integrated fiber reinforced resin member for a vehicle body according to claim 1, comprising:   The outer wall made of fiber-reinforced resin has a pair of side walls, and an inner rib extending between the pair of outer walls is provided at a position of at least two branch bone portions of the plurality of branch bone portions. The integrated fiber reinforced resin member for a vehicle body according to claim 2.   The integrated fiber reinforced resin member for a vehicle body according to claim 2, wherein a through hole is provided in the overlapping portion.

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