JP2020032629A - Component made of fiber reinforced resin - Google Patents

Abstract

To provide a component made of a fiber reinforced resin capable of obtaining high rigidity when a bending load is exerted, and capable of obtaining excellent vibration attenuation performance of by means of adopting a braiding technique.SOLUTION: A reinforcing component made of a carbon fiber reinforced resin extends in one direction along an axial core Ax, and has a carbon fiber braided body 210. The carbon fiber braided body 210 has a structure in which a plurality of central threads 211, a plurality of braid threads 212 and a plurality of braid threads 213 are interwoven. The plurality of braid threads 212 and 213 are arranged so as to turn around having a braid angle crossing the axial core Ax. The braid threads 212 and the braid threads 213 are crossing with each other. A braid angle θbetween the braid threads 212 and the braid threads 213 in a middle region Arin the longitudinal direction in the reinforcing component is larger than a braid angle in the other region in the longitudinal direction in the reinforcing component.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a fiber reinforced resin member, and more particularly, to a fiber reinforced resin member using braid technology.

  In some cases, a member made of carbon fiber reinforced resin is used as a structural member of an automobile, an aircraft, or an industrial machine (Patent Documents 1 and 2).

  Patent Document 1 discloses a configuration in which a band plate made of carbon fiber reinforced resin is used to reinforce the rigidity of a lower part of a vehicle body of an automobile. In the configuration disclosed in Patent Document 1, when the vehicle body is deformed, a torsional moment acts on the band plate material.

  Patent Document 2 discloses a configuration in which a carbon fiber reinforced resin shaft is used as a steering shaft of an automobile. In the shaft disclosed in Patent Literature 2, carbon fiber reinforced resin using a braiding technique in which carbon fibers are oriented at a predetermined braiding angle and the carbon fibers are woven together is used.

  As disclosed in these documents, by adopting a member made of carbon fiber reinforced resin, weight reduction and high rigidity can be achieved.

JP-A-2017-61170 JP-A-2005-160551

  However, it is difficult to achieve both high rigidity and excellent damping performance with the conventional techniques including the technique disclosed in Patent Document 2. That is, in the technique disclosed in Patent Document 2, high rigidity can be obtained by forming a member made of carbon fiber reinforced resin using braid technology, but when this is to be applied to a structural material, It is difficult to obtain the damping performance.

  For example, when a member made of carbon fiber reinforced resin using braiding technology is to be used as a reinforcing member in a vehicle body of an automobile, the fiber direction of the carbon fiber is set parallel to the vehicle width direction over the entire longitudinal direction of the member. When the member is oriented so as to be extended, it is difficult to obtain attenuation when a bending load is applied to the member.

  Conversely, when the fiber direction of the carbon fiber is oriented so as to extend obliquely to the vehicle width direction over the entire longitudinal direction of the member, high rigidity when a bending load is applied to the member can be obtained. hard.

  The above problem is not limited to the body of an automobile or the like, but is the same in various structures.

  SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and can achieve high rigidity when a bending load is applied by employing a braiding technique, and have excellent vibration damping performance. It is an object of the present invention to provide a fiber-reinforced resin member capable of obtaining the following.

  The member made of fiber-reinforced resin according to one embodiment of the present invention is a member made of fiber-reinforced resin, is a member extending in one direction, and circulates at a set angle crossing the one direction. A fiber braid body in which the disposed first braided yarn and a second braided yarn disposed so as to wrap around at a braid angle crossing the one direction are provided. At least one of a first set angle which is the set angle of the first set yarn and a second set angle which is the set angle of the second set yarn in a predetermined region between both end portions in the longitudinal direction of the member. Is larger than the set angle of the other area.

  Since the fiber-reinforced resin member having the above-described configuration includes the fiber braided body in which the fibers are woven, high rigidity can be secured. That is, in the fiber-reinforced resin member having the above-described configuration, the first braid and the second braid are woven and reinforced with the resin, so that high rigidity can be secured.

  Further, in the fiber reinforced resin member having the above configuration, the first set angle and the second set angle in the predetermined area are set to be larger than those in the other areas. The damping property can be increased. Therefore, a bending load was applied by providing the predetermined area in which at least one of the first set angle and the second set angle was larger than the other area in the middle of the member according to the present embodiment in the longitudinal direction. In this case, high rigidity can be obtained, and excellent vibration damping performance can be obtained.

  In the fiber reinforced resin member according to the above aspect, the first set angle and the second set angle may be not less than 60 ° and less than 90 °.

  As described above, by setting the first set angle and the second set angle within the range of 60 ° or more and less than 90 °, excellent vibration damping performance in the predetermined region can be more reliably obtained.

  In the fiber-reinforced resin member according to the above aspect, the braid angle of the first braid and the second braid in the other region may be not less than 15 ° and not more than 45 °.

  As described above, by setting the braiding angle of the first braid and the second braid in a region other than the predetermined region to a range of 15 ° or more and 45 ° or less, the elastic modulus in the other region is reduced. Can be higher. Therefore, when the above configuration is adopted, high rigidity can be secured in the other region when a bending load is applied to the fiber reinforced resin member.

  In the fiber reinforced resin member according to the above aspect, a ratio of a length of the predetermined region to a total length of the member in a longitudinal direction of the member may be 0.001 or more and 0.01 or less.

  As described above, by setting the length in the predetermined region in the longitudinal direction of the member within the range of 0.001 or more and 0.01 or less with respect to the entire length of the member, high rigidity when a bending load is applied is obtained. It is possible to achieve both the securing and the excellent vibration damping performance.

  In the fiber reinforced resin member according to the above aspect, in the fiber braided body, in addition to the first braided yarn and the second braided yarn, a central yarn arranged to extend in the one direction is also knitted. Yes, you can.

  As described above, by knitting also the central yarn extending in one direction in the fiber braided body, it is possible to secure higher rigidity in the fiber reinforced resin member.

  In the fiber reinforced resin member according to the above aspect, the outer diameter of the member may be the same over the entire area in the longitudinal direction.

  As described above, by making the outer diameter of the member the same diameter over the entire region in the longitudinal direction, stress concentration hardly occurs on a part of the outer peripheral surface when a bending load is applied to the member, and high rigidity is achieved. Excellent in securing.

  In the fiber-reinforced resin member according to the above aspect, the member is a hollow cylindrical member, and the inner diameter size of the member is smaller in the predetermined region than in the other region. Can also.

  In the predetermined area, since at least one of the first set angle and the second set angle is larger than the other area, the density of the set yarn is increased in the predetermined area (the overlapping portion is formed densely), and As described above, the inside diameter of the member is reduced in the above-described predetermined region. For this reason, in the above-mentioned predetermined region where the inner diameter size is smaller than the other portions, it is possible to reduce the elastic modulus and increase the vibration damping property.

  In the fiber-reinforced resin member according to the above aspect, the first braided yarn and the second braided yarn may be made of carbon fibers.

  As described above, by adopting carbon fibers as the first braid and the second braid, it is excellent in securing high bending rigidity.

  In the above-mentioned member made of fiber-reinforced resin, by employing the braiding technique, high rigidity can be obtained when a bending load is applied, and excellent vibration damping performance can be obtained.

FIG. 2 is a schematic bottom view showing the configuration of the bottom surface of the vehicle body according to the embodiment. FIG. 2 is a schematic bottom view showing a partial configuration of a lower surface of a vehicle body. FIG. 2 is a schematic perspective view showing a configuration of a vehicle body in a vehicle cabin. It is a schematic perspective view which shows the structure of a reinforcement member. FIG. 5 is a schematic view illustrating a configuration of a carbon fiber braided body of a reinforcing member in a portion A of FIG. 4. FIG. 5 is a schematic diagram illustrating a configuration of a carbon fiber braided body of a reinforcing member in a portion B of FIG. 4. It is a schematic perspective view which shows the manufacturing method of a carbon fiber braid body. 5A and 5B are diagrams illustrating a cross section of the reinforcing member, wherein FIG. 4A illustrates a cross section of a portion A in FIG. 4 and FIG. It is a characteristic graph which shows the threshold line for evaluating the effect which the high attenuation part in a reinforcement member has. FIG. ₆ is a characteristic graph when the set angle θ ₁ is 15 °, where (a) is a case where L ₃ / L ₁ = 0.01, (b) is a case where L ₃ / L ₁ = 0.004, (C) shows the case where L ₃ / L ₁ = 0.002, and (d) shows the case where L ₃ / L ₁ = 0.001. Braiding angle theta ₁ is a characteristic graph when the 30 °, (a) in _the case of _{L 3 / L 1 = 0.01,} (b) in _the case of L ₃ / L 1 = 0.004, (C) shows the case where L ₃ / L ₁ = 0.002, and (d) shows the case where L ₃ / L ₁ = 0.001. Braiding angle theta ₁ is a characteristic graph when the 45 _°, indicating the case of L ₃ / L 1 = 0.001. It is a schematic diagram which shows the structure of the carbon fiber braided body in the longitudinal direction center part in the reinforcing member which concerns on a modification.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The embodiment described below is an example of the present invention, and the present invention is not limited to the following embodiment except for its essential configuration.

  In the drawings used in the following description, “Fr” in FIGS. 1 to 3 indicates the front of the vehicle, “Re” indicates the rear of the vehicle, “Le” indicates the right of the vehicle, and “Ri” indicates the left of the vehicle. This is a direction based on the forward direction of the vehicle assuming a vehicle body.

[Embodiment]
1. Configuration of the lower surface of the vehicle body 1 and the interior of the vehicle cabin The configuration of the lower surface 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. FIG. 1 is a schematic bottom view showing the configuration of the lower surface of the vehicle body 1, FIG. 2 is a schematic bottom view showing a partial configuration of the lower surface of the vehicle body 1, and FIG. FIG.

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

  The dash panel 3 is provided so as to extend upward from the front end 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 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 respective intermediate portions of the pair of left and right side sills 6, and a pair of left and right hinge pillars 7 extending obliquely rearward from upper end portions thereof. 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.

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

  As shown in FIGS. 1 to 3, the floor panel 2 of the vehicle body 1 includes a tunnel portion 11 that is formed in a substantially rectangular shape in plan view 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 so as to protrude from the vehicle compartment 1b.

  Further, 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 extend in a substantially rectangular shape extending substantially parallel to the front-rear direction (Fr-Re direction). It constitutes a cross section.

  A floor frame 13 extending in the front-rear direction (Fr-Re direction) and having a substantially hat-shaped cross section is provided between each of the pair of left and right side sills 6 and each of the pair of left and right tunnel frames 12. Have been. Each of the floor frames 13 is disposed so as to be outside the vehicle body 1 as it goes to 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). ) To form a substantially rectangular closed cross section that extends substantially in parallel.

  The front end of each floor frame 13 is joined to the rear end of the front side frame 4.

  The floor panel 2 is provided with cross members 14 and 15 provided so as to extend in the left-right direction (Le-Ri direction) while straddling 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) in cooperation with the upper surface of the floor panel 2 from the side wall portion of the tunnel portion 11 to the side wall portion of the side sill 6. It 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 a front wall portion of the cross member 14 at a front end portion of the floor frame 13 with the floor panel 2 interposed therebetween. The rear end portion of the upper frame 16 is joined.

  The cross member 15 is disposed substantially in parallel with the cross member 14, and is disposed at a position corresponding to the center pillar 8.

  A pair of left and right front seats (not shown) are disposed in the vehicle interior 1b. Each seat is provided with a seat frame (not shown) for ensuring the strength and rigidity of the seat, and can slide with respect to a pair of left and right seat rails 17.

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

  Further, a plurality of reinforcing members 21 to 27 are provided below the floor panel 2.

2. The configuration of the reinforcing members 21 to 27 and the mounting configuration to the members of the vehicle body 1 The configuration of the reinforcing members 21 to 27 and the mounting configuration to the members of the vehicle body 1 will be described with reference to FIGS. 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 the present embodiment, a plurality of reinforcing members 21 to 27 are arranged in a symmetrical manner. The reinforcing member 21 is bridged between the side sill 6 on the right side of the vehicle body 1 and the tunnel frame portion 12, and is fixed to each of the fixing portions P.

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

  The reinforcing member 24 is bridged between the side sill 6 on the left side of the vehicle body 1 and the tunnel frame portion 12 on the front side of the vehicle body 1 with respect to the reinforcing member 23, and is fixed at a fixing point P respectively. The reinforcing member 25 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 26 is bridged between the left and right tunnel frame portions 12 in a state of straddling the tunnel portion 11 on the rear side of the vehicle body 1 with respect 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 12 at a fixing point P.

  As shown in FIG. 4, the reinforcing member 21 includes a long tubular portion 21a provided to extend along one direction, and fixed portions 21b and 21c provided at each end of the long tubular portion 21a. Having. The fixing portions 21b and 21c are provided with holes 21d and 21e that allow bolts to be inserted (arrows C and D). The fixing portions 21b and 21c of the reinforcing member 21 are portions to be fixed to each part of the vehicle body 1 by fastening bolts.

  Although not shown in FIG. 4, the reinforcing members 22 to 27 have the same configuration as the reinforcing member 21. However, the length of the long tubular portion is appropriately set according to the place used for the vehicle body 1.

  Here, in the reinforcing members 21 to 27 according to the present embodiment, the long tubular portion 21a is configured using carbon fiber reinforced resin (CFRP: Carbon Fiber Reinforced Plastics). Although a specific configuration will be described later, more specifically, it is configured using a so-called braiding technique, and is configured using a carbon fiber reinforced resin having a carbon fiber braided body and a resin portion.

The reinforcing member 21 according to the present embodiment, the length of the elongated tube portion 21a is L _1. The end length L ₂ spaced apart portions from the elongate tubular portion 21a, i.e., a longitudinal central portion and its peripheral region of the elongated tube portion 21a (a region indicated by arrow B), high low-modulus This is the vibration damping part.

  On the other hand, in the reinforcing member 21, a region excluding a region indicated by the arrow B (for example, a region indicated by the arrow A) is a portion having a high elastic modulus, and ensures high rigidity when a bending load is applied to the reinforcing member 21. Part for

3. Configuration of Carbon Fiber Braided Body 210 The configuration of the carbon fiber braided body 210 in the reinforcing members 21 to 27 will be described with reference to FIGS. 5 and 6. FIG. 5 is a schematic view showing the configuration of the carbon fiber braided object 210 of the long tubular portion 21a in the reinforcing members 21 to 27 in the portion A in FIG. 4, and FIG. 6 is a diagram showing the reinforcing member in the portion B in FIG. It is a schematic diagram which shows the structure of the carbon fiber assembly object 210 of the long cylinder part 21a in 21-27.

  First, as shown in FIG. 5, the carbon fiber braided object 210 has a configuration in which a plurality of central yarns 211, a plurality of braided yarns 212, and a plurality of braided yarns 213 are woven together. One of the plurality of braided yarns 212 and the plurality of braided yarns 213 according to the present embodiment corresponds to a first braided yarn, and the other corresponds to a second braided yarn.

As shown in FIG. 5, each of the plurality of center yarns 211 is disposed so as to be substantially parallel to the axis Ax ₂₁₀ of the carbon fiber braided object 210. That is, each of the plurality of center yarns 211 is disposed so as to be substantially parallel to the direction in which the long tubular portion 21a extends. Adjacent central yarns 211 are arranged at intervals in the circumferential direction.

Meanwhile, each of the plurality of braids 212 are arranged so as to surround drives out braiding angle theta ₁ with respect to the axial center Ax _210. Adjacent braided yarns 212 are also arranged at intervals in the circumferential direction.

Each of the plurality of braided yarns 213 is disposed so as to orbit around the axis Ax _{210 at} a braided angle θ ₁ and intersect with the plurality of braided yarns 212. Adjacent braided yarns 213 are also arranged at intervals in the circumferential direction.

Braiding angle theta ₁ is, for example, in the range of 15 ° to 45 °.

Next, as shown in FIG. 6, in the region Ar ₁ in the middle of the elongated tube portion 21a, the set angle of the braids 212 is theta _2, braiding angle of braids 213 also theta _2. That is, in this embodiment, both the first set angle and the second set angle and theta _2.

Braiding angle theta _2, for example, it is set in the range of less than 60 ° or 90 °.

Here, as shown in FIG. 6, the carbon fiber assembly object 210 according to the present embodiment, the region Ar _1, and the width L ₃ about the longitudinal center C _L of the elongated tube portion 21a. Width _{L 3,} for example, is defined drives out ratio in the range of 0.001 to 0.01 or less with respect to the length _{L 1} of the long cylinder portion 21a.

4. Method for Manufacturing Carbon Fiber Braided Body 210 As described above, in the carbon fiber braided body 210 according to the present embodiment, the braiding angle in the central region Ar ₁ is different from other regions (for example, the region indicated by arrow A in FIG. 4). It is assumed that the angle is larger than the set angle in the above. However, a method of manufacturing the carbon fiber set object 210 having the above configuration will be described with reference to FIG. FIG. 7 is a schematic perspective view showing a partial configuration of a manufacturing apparatus used for manufacturing the carbon fiber braided object 210.

  As shown in FIG. 7, a braid forming apparatus 500 is used for manufacturing the carbon fiber braided body 210. The braid creation device 500 includes a plurality of bobbins 501, a truck 502, and a carrier 503. The plurality of bobbins 501 draw out carbon fibers (central yarn 211, braided yarns 212 and 213) while orbiting while maintaining their relative positional relationship, and wind the carbon fibers around the outer periphery of a mandrel not shown. Turn around.

The mandrel and the plurality of bobbins 501 are scanned at a relative speed V1. In the present embodiment, only the period for winding the braids 212, 213 of a portion corresponding to the region Ar ₁ in the carbon fibrous assembly object 210, slowing the operation speed V1. Alternatively, only the period for winding the braids 212, 213 of a portion corresponding to the region Ar ₁ in the carbon fibrous assembly object 210, to increase the revolution speed and rotation speed of the plurality of bobbins 501.

5. Inner diameters D ₁ , D ₂ and outer diameters D ₃ , D _{4 of} long tubular portion 21 a
Internal diameter _D 1, _{D 2} and an outer diameter _D 3, _{D 4} of the elongated tube portion 21a, will be described with reference to FIG. 8A and 8B are diagrams showing a cross section of the reinforcing member 21. FIG. 8A shows a cross section of a portion A in FIG. 4, and FIG. 8B shows a cross section of a portion B in FIG.

As shown in FIG. 8 (a), in the A portion of Fig. 4, the inner diameter of the elongated tube portion 21a is _{D 1,} an outer diameter of _{D 3.}

On the other hand, as shown in FIG. 8 (b), B part of FIG. 4 in (area Ar ₁₎ has an inner diameter of the elongated tube portion 21a is _{D 2,} the outer diameter of _{D 4.} In the long tubular portion 21a according to the present embodiment, the relationship between the inner diameters D ₁ and D _{2 and} the relationship between the outer diameters D ₃ and D ₄ are as follows.

D ₁ > D ₂ ··· (Equation 1)
D ₃ = D ₄ (Equation 2)
Number 1 relationship described above, due to the relation between the set angle theta ₁ and set the angle theta ₂ of the braids 212, 213. That is, as described above, from the relationship of θ ₂ > θ ₁ , the overlap between the braided yarn 212 and the braided yarn 213 is widened in the circumferential direction, whereby when the mandrel is pulled out and fired by the above-described manufacturing method, When the inner peripheral surface of the region Ar ₁ is reduced in diameter inward in the radial direction, the above relationship of Expression 1 is satisfied.

6. For setting a set angle theta ₂ of the setting of the length _{L 3} set a set angle theta ₂ of the set area Ar ₁ length _{L 3} region Ar _1, it will be described with reference to FIGS. 9 to 12. FIG. 9 is a characteristic graph showing a threshold line in which the region Ar ₁ in the reinforcing members 21 to 27 has an effect as a high attenuation portion. Figure 10 is a characteristic graph when the set angle theta ₁ is 15 °, (a) in _the case of _{L 3 / L 1 = 0.01,} (b) _{is, L 3 / L 1 = 0} . In the case of 004, (c) shows the case where L ₃ / L ₁ = 0.002, and (d) shows the case where L ₃ / L ₁ = 0.001. Figure 11 is a characteristic graph when the set angle theta ₁ is 30 °, (a) in _the case of _{L 3 / L 1 = 0.01,} (b) _{is, L 3 / L 1 = 0} . In the case of 004, (c) shows the case where L ₃ / L ₁ = 0.002, and (d) shows the case where L ₃ / L ₁ = 0.001. Figure 12 is a characteristic graph when the set angle theta ₁ is 45 _°, indicating the case of L ₃ / L 1 = 0.001.

(1) Setting of Threshold Line As shown in FIG. 9, a horizontal axis represents a rigidity of the long tubular portion 21a, and a vertical axis represents a characteristic diagram representing damping. However, the absolute values of the horizontal axis and the vertical axis differ depending on the shape and material of the test piece.

  In FIG. 9, the line shown by the solid line is a characteristic line when the braided yarn is wound at a uniform braid angle to form a long tubular portion.

In the present embodiment, as shown by the broken line in FIG. 9, it is possible to improve the damping property by 50% while maintaining the same rigidity as compared with a case where the braid is wound at a uniform braiding angle. Assuming a possible line, this was defined as a threshold line. In the present embodiment, in the graph shown in FIG. 9, so that the upper right region than threshold line, was set and the set angle theta ₂ of the set length L ₃ of the area Ar _1.

  In FIG. 9, a broken line extending along the horizontal axis with an attenuation of 0.00125 is a line indicating the lower limit of the attenuation rate.

(2) Case of θ ₁ = 15 ° FIG. 10 is a graph showing the relationship between the rigidity and the damping rate when the set angle θ ₁ of the set yarns 212 and 213 in the part A of FIG. 4 is 15 °.

As shown in FIG. 10A, when L ₃ / L ₁ = 0.01, the attenuation rate has the lower limit when θ ₂ = 60 °. It can be seen that the damping can be improved by 50% by setting θ ₁ = 15 ° and θ ₂ = 60 °.

As shown in FIG. 10B, when L ₃ / L ₁ = 0.004, the attenuation rate has the lower limit when θ ₂ = 83.5 °. It can be seen that by setting θ ₁ = 15 ° and θ ₂ = 83.5 °, the damping property can be improved by 50%.

As shown in FIG. 10C, when L ₃ / L ₁ = 0.002, the attenuation rate has a lower limit when θ ₂ = 85 °. Further, it can be seen that by setting θ ₁ = 15 ° and θ ₂ = 85 °, the damping property can be improved by 50%.

As shown in FIG. 10D, when L ₃ / L ₁ = 0.001, when θ ₂ = 87 °, the attenuation rate has the lower limit. It can be seen that the damping can be improved by 50% by setting θ ₁ = 15 ° and θ ₂ = 87 °.

(3) θ ₁ = 30 ° in the case 11 is a graph braiding angle theta ₁ of the braids 212 and 213 in the A portion of Fig. 4 shows the relationship between the stiffness and damping factor in the case of 30 °.

As shown in FIG. 11A, when L ₃ / L ₁ = 0.01, the measured line does not come to the upper right of the graph than the threshold line, and the attenuation cannot be improved by 50%. You can see that.

As shown in FIG. 11B, when L ₃ / L ₁ = 0.004, the attenuation rate has the lower limit when θ ₂ = 89 °. Further, it can be seen that by setting θ ₁ = 15 ° and θ ₂ = 89 °, the damping property can be improved by 50%.

As shown in FIG. 11C, even when L ₃ / L ₁ = 0.002, when θ ₂ = 89 °, the attenuation rate has the lower limit. Further, it can be seen that by setting θ ₁ = 15 ° and θ ₂ = 89 °, the damping property can be improved by 50%.

As shown in FIG. 11D, when L ₃ / L ₁ = 0.001, and when θ ₂ = 89 °, the attenuation rate has the lower limit. Further, it can be seen that by setting θ ₁ = 15 ° and θ ₂ = 89 °, the damping property can be improved by 50%.

(4) Case of θ ₁ = 45 ° FIG. 12 shows the rigidity when the braided angle θ ₁ of the braided yarns 212 and 213 in the part A in FIG. 4 is 45 ° and L ₃ / L ₁ = 0.001. 4 is a graph showing the relationship between the decay rate and the decay rate. Although not 12 the characteristic graph, when the set angle theta ₁ of the braids 212 and 213 in the A portion of Fig. 4 is 45 ° _{is, L 3 / L 1 = 0.01} , L 3 In the case of / L ₁ = 0.004 and L ₃ / L ₁ = 0.002, the measured line is not located at the upper right of the graph with respect to the threshold line, and the attenuation cannot be improved by 50%. I have confirmed.

As shown in FIG. 12, when L ₃ / L ₁ = 0.001, and when θ ₂ = 89.9 °, the attenuation rate has the lower limit. It can be seen that by setting θ ₁ = 15 ° and θ ₂ = 89.9 °, the attenuation can be improved by 50%.

(5) Summary The above results are summarized in the following table.

  In Table 1, "NG" indicates a position where the actual measurement line is not at the upper right of the graph than the threshold line, and the attenuation cannot be improved by 50%.

As shown in Table 1, the relationship between the ratio L ₃ / L ₁ and θ ₁ and θ ₂ is required to improve the vibration damping rate by 50% or more while maintaining the rigidity of the long tubular portion 21a high. Are related. Specifically, as the ratio of L ₃ / L ₁ decreases, θ ₂ that can improve the attenuation factor by 50% or more is set even when θ ₁ is somewhat large (45 ° in Table 1). be able to.

Further, as the theta ₁ is less, theta ₂ to some extent be set small (Table 1, 60 °), the attenuation factor can be set theta ₂ which can be improved more than 50%.

7. Effect Since the long tubular portion 21a of the reinforcing members 21 to 27 according to the present embodiment includes the carbon fiber braided body 210 in which the central yarn 211 made of carbon fiber and the braided yarns 212 and 213 are woven, high rigidity is secured. can do. That is, in the long tubular portion 21a according to the present embodiment, the braided yarn 212 and the braided yarn 213 are braided and reinforced with resin thereon, so that high rigidity can be secured.

Further, the long tubular part 21a according to this embodiment, a set angle theta ₂ of the braids 212, 213 in the longitudinal direction of the central region Ar _1, comprising an end portion of the other region (elongated tubular portion 21a , for example, since the larger than a set angle theta ₁ of part a) of FIG. 4, lower elastic modulus in the region Ar _1, it is possible to increase the vibration damping. Therefore, by providing the region Ar _{1 in} which the group angle θ ₂ is larger than the group angle θ ₁ in the middle of the long cylindrical portion 21a in the longitudinal direction, it is possible to obtain high rigidity when a bending load is applied. In addition, excellent vibration damping performance can be obtained.

In the long cylinder portion 21a according to the present embodiment, as described with reference to FIGS. 12 and Table 1 from FIG. 9, by a set angle theta ₂ to the range of less than 60 ° or 90 °, the region Ar ₁ , Excellent vibration damping performance can be obtained more reliably.

In the long cylinder portion 21a according to the present embodiment, as described with reference to FIGS. 12 and Table 1 from FIG. 9, a set angle theta _1, by the range of 15 ° to 45 °, long The elastic modulus in a region other than the central portion of the cylindrical portion 21a can be increased. Therefore, in the long tubular portion 21a according to the present embodiment, when a bending load is applied, high rigidity can be secured in a region other than the central portion.

In the long cylinder portion 21a according to the present embodiment, the length _{L 3} in the region Ar ₁ in the longitudinal direction and be in the range of 0.001 to 0.01 or less with respect to the total length _{L 1,} the bending load In this case, it is possible to ensure both high rigidity and excellent vibration damping performance.

In the long cylinder portion 21a according to the present embodiment, the carbon fiber set object 210, by weaving also central yarn 211 extending along the axial Ax _210, it is possible to ensure a higher stiffness in the longitudinal tubular portion 21a .

In the long cylinder portion 21a according to the present embodiment, as described with reference to FIG. 8, by an outer diameter D ₃ and the outer diameter D ₄ and the same diameter, it takes bending load on the elongated tube portion 21a In this case, stress concentration hardly occurs on a part of the outer peripheral surface, which is excellent in securing high rigidity.

In the long cylinder portion 21a according to the present embodiment, since the larger than the set angle θ1 a set angle theta ₂ in the region Ar _1, the density of the braids 212, 213 in the region Ar ₁ is other regions (end becomes higher than the region, etc.) (overlapped portion is densely formed), as described above, the inner diameter D ₂ is smaller than the inner diameter D _1. For this reason, the outer diameter D ₃ and the outer diameter D ₄ are made equal to each other to improve the quality of the outer tube and to avoid a local concentration of stress while lowering the elastic modulus and increasing the vibration damping property in the region Ar ₁ . be able to.

  In the long tubular portion 21a according to the present embodiment, since the central yarn 211 and the braided yarns 212 and 213 are made of carbon fiber, it is excellent in securing high bending rigidity.

  As described above, the reinforcing members 21 to 27 according to the present embodiment are provided with the long tubular portion 21a that is a member made of carbon fiber reinforced resin, so that a bending load is applied by employing the braiding technology. High rigidity can be obtained, and excellent vibration damping performance can be obtained.

[Modification]
The configuration of the carbon fiber braided body 310 according to the modification will be described with reference to FIG. FIG. 13 is a schematic diagram illustrating a configuration of a carbon fiber braided body 310 in a longitudinally central region Ar1 and a peripheral region thereof in a reinforcing member according to a modified example. The carbon fiber reinforced resin member according to the present modification is the same as the above embodiment except for the configuration of the carbon fiber braided body 310, and therefore, the overlapping description will be omitted.

As shown in FIG. 13, the carbon fiber braided object 310 according to the present modification is also configured by weaving a plurality of central yarns 311 and a plurality of braided yarns 312 and 313. The center yarn 311 is disposed so as to extend linearly along the axis Ax ₃₁₀ of the carbon fiber braided body 310, similarly to the center yarn 211 according to the embodiment.

Braids 312 and 313, in the longitudinally central region Ar _1, is wound so as to surround a set angle theta ₂ with respect to the axial center _{Ax 310,} in the region of the longitudinal end portions, in the axial _{Ax 310} It is wound so as to surround a set angle theta ₁ against. These are not shown in FIG. 13 but are the same as in the above embodiment.

This modification is different from the above embodiment, in the longitudinal direction of the carbon fiber set object 310, the set angle of the braids 312 and 313 to: both sides portion of the region Ar ₁ is wound so as to surround at theta ₃ The point is that regions Ar ₂ and Ar ₃ are provided. Braiding angle theta ₃ is set so as to satisfy the following relation.

θ ₂ > θ ₃ > θ ₁ (Equation 3)
In the carbon fiber assembly object 310 according to the present modification, by providing the regions Ar ₂ and Ar ₃ as described above, the region Ar _{1 at the} center in the longitudinal direction of the carbon fiber assembly object 310 and the region at the end in the longitudinal direction are arranged. It is possible to suppress a sudden change in the braiding angle between the braiding yarns 312 and 313, and to suppress a stress concentration accompanying a change in the braiding angle.

  Note that the reinforcing member having the carbon fiber braided object 310 according to the present modification also has the same configuration as the reinforcing members 21 to 27 according to the above-described embodiment except for the configuration of the carbon fiber braided body 310. Can be played as it is.

[Other Modifications]
In the above embodiment and the above modified example, the reinforcing members 21 to 27 used for reinforcing the lower surface of the vehicle body 1 are adopted as an example of the member made of the fiber reinforced resin, but the present invention is not limited to this. . For example, it can be adopted as a strut tower bar.

  Further, in the present invention, the same effect as described above can be obtained by adopting a member having the above configuration as a structural member itself as well as a member for reinforcing a certain portion. For example, if it is a vehicle body, it can be applied to a roof side rail, a center pillar, a front pillar, and the like.

  Further, the member having the above configuration is not limited to the body of an automobile or the like, and can be applied to various structures (for example, industrial equipment and the like).

  Further, in the above-described embodiment and the above-described modified example, the hollow cylindrical long tubular portion 21a is adopted as an example of the fiber reinforced resin member, but the present invention is not limited to this. For example, application to a solid member is possible, and the cross-sectional shape is not limited to a circle, but may be an ellipse, an ellipse, or a polygonal cross section.

Further, in the above-described embodiment and the above-described modified example, the configuration in which the plurality of central yarns 211 and 311 are disposed in the entire region in the longitudinal direction of the long tubular portion is described as an example, but the present invention is limited to this. is not. For example, in the longitudinal center of the region Ar _1, it is also possible to omit some or all of the plurality of central thread. Thereby, it is easy to balance the rigidity and the vibration damping property in the central region.

In the above embodiment and the above modification, braids 212, 312 and both braids 213, 313 both have, than the set angle theta ₂ is set angle theta ₁ of the other areas in the longitudinal center of the region Ar ₁ Although an enlarged configuration is employed, the present invention is not limited to this. For example, a configuration in which only one of the braiding yarns has a larger braiding angle in the central region in the longitudinal direction than in the other region may be employed.

In the above embodiment and the above modification, the longitudinal braiding angle theta ₂ in the direction center region Ar ₁ braids 212, 312 and braids 213, 313 is larger than the set angle theta ₁ of another area configuration Although adopted, the predetermined region where the braiding angle of the braid is larger than the other regions is not limited to the center in the longitudinal direction of the member. For example, in a region offset from the center in the longitudinal direction of the fiber reinforced resin member to one end side, it is possible to make the braiding angle of the braiding yarn larger than in other regions. Further, the predetermined region in which the braiding angle of the braiding yarn is increased is not limited to one region in the longitudinal direction of the fiber reinforced resin member, but may be a plurality of regions.

  Further, in the above embodiment and the above modified example, 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), fiber reinforced resin using metal fibers such as non-ferrous metals, and the like can be used. is there.

2 Floor panel 21-27 Reinforcement member (fiber reinforced resin member)
210,310 Carbon fiber braided body (fiber braided body)
211, 311 Central yarn 212, 312 Braided yarn (first braided yarn)
213, 313 braid (second braid)

Claims (8)

A member made of fiber reinforced resin, extending in one direction,
A first braid arranged so as to wrap around at a braid angle crossing the one direction;
A second braid arranged so as to wrap around at a braid angle crossing the one direction;
Is provided with a fiber braid body woven together,
In a predetermined region between both ends in the longitudinal direction of the member, at least one of a first set angle that is the set angle of the first set yarn and a second set angle that is the set angle of the second set yarn is Greater than the set angle of the other area,
Fiber reinforced resin member. The fiber-reinforced resin member according to claim 1,
The first set angle and the second set angle are 60 ° or more and less than 90 °,
Fiber reinforced resin member. The fiber-reinforced resin member according to claim 1 or 2,
The braiding angle of the first braid and the second braid in the other region is not less than 15 ° and not more than 45 °,
Fiber reinforced resin member. The fiber-reinforced resin member according to any one of claims 1 to 3,
In the longitudinal direction of the member, the ratio of the length of the predetermined region to the entire length of the member is 0.001 or more and 0.01 or less.
Fiber reinforced resin member. The fiber-reinforced resin member according to any one of claims 1 to 4,
In the fiber braided body, in addition to the first braided yarn and the second braided yarn, a central yarn arranged to extend in the one direction is also knitted.
Fiber reinforced resin member. The fiber-reinforced resin member according to any one of claims 1 to 5,
The outer diameter size of the member is the same over the entire area in the longitudinal direction.
Fiber reinforced resin member. The member made of fiber reinforced resin according to any one of claims 1 to 6,
The member is a hollow cylindrical member,
The inner diameter size of the member is smaller in the predetermined area than in the other area.
Fiber reinforced resin member. The fiber-reinforced resin member according to any one of claims 1 to 7,
The first braid and the second braid are composed of carbon fibers.
Fiber reinforced resin member.