WO2020218039A1 - Structure d'absorption de choc - Google Patents

Structure d'absorption de choc Download PDF

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Publication number
WO2020218039A1
WO2020218039A1 PCT/JP2020/016216 JP2020016216W WO2020218039A1 WO 2020218039 A1 WO2020218039 A1 WO 2020218039A1 JP 2020016216 W JP2020016216 W JP 2020016216W WO 2020218039 A1 WO2020218039 A1 WO 2020218039A1
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WIPO (PCT)
Prior art keywords
yarn
interlayer
twists
fiber
load input
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PCT/JP2020/016216
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English (en)
Japanese (ja)
Inventor
森康平
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株式会社豊田自動織機
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Application filed by 株式会社豊田自動織機 filed Critical 株式会社豊田自動織機
Publication of WO2020218039A1 publication Critical patent/WO2020218039A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
    • B60R19/02—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
    • B60R19/24—Arrangements for mounting bumpers on vehicles
    • B60R19/26—Arrangements for mounting bumpers on vehicles comprising yieldable mounting means
    • B60R19/34—Arrangements for mounting bumpers on vehicles comprising yieldable mounting means destroyed upon impact, e.g. one-shot type
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D1/00—Woven fabrics designed to make specified articles
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D11/00—Double or multi-ply fabrics not otherwise provided for
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F7/00—Vibration-dampers; Shock-absorbers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F7/00—Vibration-dampers; Shock-absorbers
    • F16F7/12—Vibration-dampers; Shock-absorbers using plastic deformation of members

Definitions

  • the present invention relates to a shock absorbing structure that is configured by impregnating a fiber structure with a matrix material and absorbs shock energy when it receives a shock.
  • a shock absorbing structure is arranged between the bumper and the side member of the vehicle body, and this shock absorbing structure is destroyed by the impact when the vehicle receives an excessive impact from the bumper side. By doing so, it absorbs impact energy.
  • the shock absorbing structure reduces the required compressive strength, which is the strength against the load, in the range from the tip to a predetermined position along the load input direction, and is destroyed by the load. It's easy.
  • the required compressive strength which is the strength against the load
  • the required compression strength is gradually increased so that an excessive load is not applied to the driver's seat side.
  • the fiber structure is formed by stacking a plurality of sheet-shaped fiber layers. Further, in the fiber structure disclosed in Patent Document 1, a plurality of sheet-shaped fiber layers are stacked at the tip portion to have a uniform thickness to reduce the required compression strength, and the sheet-shaped fiber toward the proximal end portion side. The required compression strength is increased by stacking the layers with the edges shifted in a staircase pattern.
  • a multi-layer weave other than a method of shifting and stacking fiber layers.
  • the fiber structure formed by the multi-layer weave has a plurality of warp layers in which a plurality of warp threads are arranged and a plurality of weft threads in which a plurality of weft threads are arranged in the stacking direction. A plurality of weft layers are bonded in the stacking direction.
  • An object of the present invention is to provide a shock absorbing structure capable of adjusting the required compression strength while suppressing the manufacturing cost.
  • the shock absorbing structure for solving the above problems has a fiber structure and a matrix material impregnated in the fiber structure to form the shock absorbing structure, and receives impact energy when impacted.
  • a shock absorbing structure that absorbs, said the fiber structure is a multilayer woven fabric having a load direction thread extending in a load input direction in which a load is applied to the shock absorbing structure, and a plurality of fiber layers are laminated in the laminating direction.
  • the interlayer binding yarn is provided as an interlayer binding yarn to be bonded, and the interlayer binding yarn of the fiber structure is aligned in the load input direction and extends in a direction orthogonal to the load input direction, and the fiber.
  • the structure has a first portion having a tip surface to which a load is first applied, and has a second portion continuous with the first portion along the load input direction, and the fiber structure is subject to a load.
  • the number of twists of the interlayer-bonded yarn in the first part and the number of twists of the interlayer-bonded yarn in the second part are set to be different. The gist is that it has been done.
  • the shock absorbing structure adjusts the required compression strength of the first part and the second part so as to exert the function as the shock absorbing structure. That is, when the shock absorbing structure receives an impact, the impact energy is absorbed at the first portion where the load is first applied, and the second portion prevents the impact from extending to the inner side in the load input direction.
  • the twisted yarns constituting the interlayer bonded yarns have a higher elongation rate as the number of twists increases up to a certain number of twists. The larger the elongation rate of the interlayer bond yarn, the easier it is to suppress the tearing of the shock absorbing structure when a load is applied, and the more the tearing is suppressed, the higher the required compression strength can be.
  • the first part and the second part can be obtained. It can be adjusted to the required compression strength. Therefore, in order to adjust the required compressive strength required for the first and second sites, the number of fiber layers at each site is different in the stacking direction of the fiber layers, and the threads constituting the fiber structure are cut. The required compressive strength can be adjusted to a desired value while suppressing the manufacturing cost of the shock absorbing structure.
  • the number of the fiber layers in the first portion and the number of the fiber layers in the second portion are the same, and the cross-sectional area of the first portion orthogonal to the load input direction is used.
  • the number of twists of the interlayer-bonded yarn constituting the first portion may be set to be larger than the number of twists of the interlayer-bonded yarn constituting the first portion.
  • the required compression strength of the first part and the second part can be obtained only by adjusting the number of twists of the interlayer bonding yarn. It can be adjusted to the desired value.
  • the number of the fiber layers in the first portion and the number of the fiber layers in the second portion are the same, and the cross-sectional area of the first portion orthogonal to the load input direction is
  • the first portion is configured so as to be smaller than the cross-sectional area of the second portion orthogonal to the load input direction and the required compressive strength of the first portion and the required compressive strength of the second portion are aligned.
  • the number of twists of the interlayer-bonded yarn may be set to be larger than the number of twists of the interlayer-bonded yarn constituting the second portion.
  • the required compression strength of the first portion and the second portion can be obtained by adjusting the number of twists of the interlayer bonding yarn. Can be matched.
  • the required compression strength can be adjusted while suppressing the manufacturing cost.
  • a shock absorbing structure 20 is fixed to a pair of left and right front side members 11 constituting the vehicle body at the rear ends in the front-rear direction of the vehicle.
  • a front bumper 12 is fixed to the front end of both shock absorbing structures 20 in the vehicle front-rear direction.
  • the shock absorbing structure 20 is made of a fiber reinforced composite material.
  • the shock absorbing structure 20 has a square tubular fiber structure 21 and a matrix resin which is an example of a matrix material, and is configured by impregnating the fiber structure 21 with a thermosetting resin 19 as a matrix resin.
  • the shock absorbing structure 20 absorbs shock energy by being destroyed when it receives an excessive shock.
  • the direction in which the load is applied to the shock absorbing structure 20 is referred to as the load input direction Z.
  • the load input direction Z coincides with the extending direction of the axis L of the fiber structure 21.
  • the thermosetting resin 19 for example, an epoxy resin is used.
  • the fiber structure 21 has a tip end surface 21a on one end surface in the load input direction Z to which a load is first applied, and a base end surface 21b on an end surface opposite to the tip end surface 21a. ..
  • the tip surface 21a of the fiber structure 21 constitutes the front end of the shock absorbing structure 20 to which the front bumper 12 is fixed, and the base end surface 21b of the fiber structure 21 is a shock absorbing structure to which the front side member 11 is fixed. It constitutes the rear end of 20.
  • the fiber structure 21 has a square tubular first portion 23 having a tip surface 21a, a square tubular second portion 24 continuous with the first portion 23 along the load input direction Z, and a load input direction Z. It has a square tubular third portion 25 continuous with the second portion 24.
  • a base end surface 21b is provided at the other end of the third portion 25 in the load input direction Z.
  • the dimensions of the first to third parts 23 to 25 along the load input direction Z are different, the second part 24 is the shortest, and the third part 25 is the longest.
  • the boundary between the first portion 23 and the second portion 24 along the load input direction Z and the boundary between the second portion 24 and the third portion 25 along the load input direction Z are twisted threads 26 described later. This is the position where the number changes.
  • the first portion 23, the second portion 24, and the third portion 25 have the same thickness and have a constant thickness along the load input direction Z.
  • the cross-sectional area of the first part 23 orthogonal to the load input direction Z, the cross-sectional area of the second part 24 orthogonal to the load input direction Z, and the cross-sectional area of the third part 25 orthogonal to the load input direction Z are approximately the same. It is the same.
  • cross-sectional areas of the first to third parts 23 to 25 are almost the same means that the difference between the cross-sectional areas is equal to or less than a preset threshold value, and the cross-sectional areas of the first to third parts 23 to 25 It is natural that the cross-sectional areas are the same, and it also means that the cross-sectional areas of the first to third parts 23 to 25 are slightly different due to the manufacturing error of the fiber structure 21 and the error caused by the thickness of the fibers. ..
  • the load applied in the load input direction Z is gradually increased, and the load when the first to third parts 23 to 25 are compressed and destroyed is defined as the required compression strength.
  • This required compressive strength is also the maximum value of the load that the first to third portions 23 to 25 can withstand.
  • the first portion 23 is a portion that becomes a starting point of destruction when an impact is received. Therefore, the required compression strength of the first portion 23 is smaller than the required compression strength of the second portion 24 and the required compression strength of the third portion 25, and the first portion 23 is a portion that is easily destroyed.
  • the second part 24 and the third part 25 are parts that gradually suppress the progress of destruction when an impact is received and suppress an excessive load from being applied to the driver's seat side. Therefore, the required compression strength of the second part 24 is set to be larger than the required compression strength of the first part 23, and the required compression strength of the third part 25 is set to be larger than the required compression strength of the second part 24. ..
  • the fiber structure 21 is a multi-layer woven fabric.
  • the fiber structure 21 includes five weft layers formed by arranging a plurality of wefts 27a in parallel with each other in a direction orthogonal to the load input direction Z and along the surface of the fiber structure 21. That is, the fiber structure 21 has a weft 27a.
  • the five weft layers are referred to as the first to fifth weft layers 31 to 35.
  • the fiber structure 21 includes four warp yarn layers formed by arranging a plurality of warp yarns 28a in parallel with each other in the load input direction Z.
  • the four warp layers are referred to as first to fourth warp layers 41 to 44.
  • the fiber structure 21 has a plurality of interlayer bonds that bond the first to fifth weft layers 31 to 35 and the first to fourth warp layers 41 to 44 (that is, a plurality of fiber layers) in the stacking direction X.
  • a thread 26 is provided.
  • the weft yarn 27a, the warp yarn 28a, and the interlayer binding yarn 26 are fiber bundles in which reinforcing fibers are bundled.
  • Organic fibers or inorganic fibers may be used as the reinforcing fibers constituting the weft 27a, the warp 28a, and the interlayer bonding yarn 26, or different types of organic fibers, different types of inorganic fibers, or organic fibers and inorganic fibers. You may use the mixed fiber which mixed the fiber.
  • organic fiber examples include acrylic fiber, nylon fiber, polyester fiber, aramid fiber, poly-p-phenylene benzobisoxazole fiber, ultrahigh molecular weight polyethylene fiber and the like
  • inorganic fiber examples include carbon fiber, glass fiber and ceramic fiber. And so on.
  • the fiber structure 21 is composed of the first to fifth weft layers 31 to 35 and the first to fourth warp layers 41 to 44 stacked.
  • the direction in which the first to fifth weft layers 31 to 35 and the first to fourth warp layers 41 to 44 are stacked is defined as the stacking direction X.
  • each weft thread 27a functions as a load direction thread extending in the load input direction Z.
  • the first weft layer 31 and the second weft layer 32 overlap in the stacking direction X
  • the second weft layer 32 and the third weft layer 33 overlap in the stacking direction X
  • the third weft layer 33 and the fourth weft layer 34 overlap in the stacking direction X
  • the fourth weft layer 34 and the fifth weft layer 35 overlap in the stacking direction X.
  • the first warp layer 41 is located between the first weft layer 31 and the second weft layer 32 in the stacking direction X
  • the second warp layer 42 is the second weft in the stacking direction X. It is located between the layer 32 and the third weft layer 33.
  • the third warp layer 43 is located between the third weft layer 33 and the fourth weft layer 34 in the stacking direction X
  • the fourth warp layer 44 is the fourth weft layer 34 in the stacking direction X. It is located between the fifth weft layer 35 and the fifth weft layer 35.
  • the interlayer bonding yarn 26 is manufactured by twisting yarn. As shown in FIG. 3, the interlayer bonding yarn 26 (twisted yarn) is formed by twisting a bundle of reinforcing fibers 26a in one direction by downward twisting, and then combining the bundles of the plurality of downward twisted reinforcing fibers 26a into a downward twist. It is formed by twisting upward in the opposite direction. Then, in the interlayer bond yarn 26, the difference between the number of twists in the lower twist and the number of twists in the upper twist is defined as the number of twists.
  • the elongation rate increases and the breaking strain increases as the number of twists increases up to a certain value.
  • the number of twists of the interlayer bonding yarn 26 becomes larger than a certain value, the elongation rate becomes small and the breaking strain becomes small.
  • the interlayer bonding yarns 26 are lined up in the load input direction Z and extend in a direction orthogonal to the load input direction Z.
  • the interlayer bonding thread 26 is for maintaining the shape of the fiber structure 21.
  • the plurality of interlayer bonding yarns 26 are arranged substantially parallel to each warp yarn 28a and pass through the outer surface of the weft yarn 27a of the uppermost first weft yarn layer 31 constituting the fiber structure 21. It is arranged so that it folds back.
  • each interlayer binding thread 26 is arranged so as to penetrate the fiber structure 21 in the stacking direction X and fold back through the outer surface of the weft thread 27a of the fifth weft thread layer 35 of the lowermost layer.
  • the positions of the weft threads 27a folded back in the first weft layer 31 or the fifth weft layer 35 are orthogonal to the load input direction Z and are on the surface of the fiber structure 21. It is offset in the direction along.
  • the interlayer bonding yarn 26 engages with each weft yarn 27a the first to fifth weft yarn layers 31 to 35 are bonded in the stacking direction X, and the warp yarn layer is formed between the weft yarn layers adjacent to each other in the stacking direction X. It is combined. Further, the first to fifth weft layers 31 to 35 and the first to fourth warp layers 41 to 44 are bonded in the stacking direction X by the interlayer bonding yarn 26.
  • the first site 23, the second site 24, and the third site 25 all include first to fifth weft layers 31 to 35 and first to fourth warp layers 41 to 44, and the number of fiber layers is the same. Is. Therefore, the thickness, which is the dimension of the first to third parts 23 to 25 in the stacking direction X, is almost the same, and as described above, the cross-sectional areas of the first to third parts 23 to 25 are also almost the same. ..
  • the required compression strength is different even for the first to third parts 23 to 25 having almost the same thickness and cross-sectional area.
  • the difference in the required compression strength is that the number of twists differs between the interlayer binding yarn 26 constituting the first portion 23, the interlayer binding yarn 26 constituting the second portion 24, and the interlayer binding yarn 26 constituting the third portion 25. It is expressed by making it. That is, the required compression strength of the first to third portions 23 to 25 is adjusted to a desired value by the number of twists of the interlayer bonding yarn 26 constituting the first to third portions 23 to 25.
  • the shock absorbing structure 20 when a load is applied, the shock absorbing structure 20 tries to split in the direction orthogonal to the load input direction Z while being compressed in the load input direction Z in any of the first to third parts 23 to 25. At this time, the tension of the interlayer coupling thread 26 extending in the direction orthogonal to the load input direction Z prevents the first to third portions 23 to 25 from being torn in the direction orthogonal to the load input direction Z.
  • the elongation rate of the interlayer-bonded yarn 26 increases and the tensioning force increases up to a certain number of twists. Therefore, as the number of twists of the interlayer binding yarn 26 increases, the function of suppressing the tearing of the first to third portions 23 to 25 due to the tension of the interlayer binding yarn 26 is enhanced. Then, the required compression strength is also enhanced by enhancing the function of suppressing the tearing of the first to third portions 23 to 25.
  • the required compression strength of the first part 23 is the smallest.
  • the interlayer binding yarn 26 constituting the first moiety 23 is the first interlayer binding yarn 261
  • the first moiety 23 is torn by minimizing the number of twists of the first interlayer binding yarn 261.
  • the function of suppressing the above is suppressed, and the required compression strength of the first portion 23 is minimized.
  • the interlayer binding yarn 26 constituting the second portion 24 is the second interlayer binding yarn 262
  • the number of twists of the second interlayer binding yarn 262 is made larger than the number of twists of the first interlayer binding yarn 261.
  • the function of suppressing the tearing of the two parts 24 is enhanced as compared with the first part 23, and the required compression strength of the second part 24 is made larger than that of the first part 23.
  • the interlayer binding thread 26 constituting the third portion 25 is referred to as a third interlayer binding thread 263.
  • the number of twists of the third interlayer binding yarn 263 is made larger than the number of twists of the second interlayer binding yarn 262, and the number of twists is the largest among the first to third portions 23 to 25 to suppress the tearing of the third portion 25.
  • the function to perform is the highest, and the required compression strength of the third portion 25 is maximized.
  • FIG. 6 shows the correlation between the number of twists of the interlayer bonding yarn 26 and the required compression strength.
  • the horizontal axis corresponds to the number of twists, and the vertical axis corresponds to the required compression strength.
  • the required compression strength increases as the number of twists of the interlayer bonding yarn 26 increases. Then, as the number of twists increases from a constant value, the required compression strength decreases.
  • the number of twists N1 of the first interlayer coupling yarn 261 is set so that the required compression strength of the first portion 23 can be obtained.
  • the number of twists N1 of the first interlayer coupling yarn 261 is zero.
  • the twist number N2 of the second interlayer coupling yarn 262 is set so that the required compression strength of the second portion 24 can be obtained.
  • the twist number N3 of the third interlayer bonding yarn 263 is set so that the required compression strength of the third portion 25 can be obtained.
  • the number of twists N3 of the third interlayer bond yarn 263 is set to the number of twists at which the maximum value of the required compression strength can be obtained.
  • the fiber structure 21 has the number of twists N1 of the first interlayer bond yarn 261 and the second interlayer bond yarn.
  • the number of twists N2 of 262 and the number of twists N3 of the third interlayer coupling yarn 263 are set to be different.
  • the shock absorbing structure 20 has the same number of fiber layers at any position along the load input direction Z, and although the thickness is substantially the same, the required compression strength differs depending on the position in the load input direction Z. ..
  • the boundary between the first part 23 and the second part 24 and the boundary between the second part 24 and the third part 25 are positions where the number of twists of the interlayer bonding yarn 26 changes.
  • the action of the shock absorbing structure 20 will be described.
  • a load is applied to the impact absorbing structure 20 via the front bumper 12.
  • the shock absorbing structure 20 absorbs shock energy by causing local destruction in the first portion 23. After that, the progress of destruction is suppressed at the second site 24 and the third site 25.
  • the number of twists of the first to third interlayer bonding yarns 261 to 263 constituting the first to third portions 23 to 25 is set to a desired value while being different. It was adjusted to the required compression strength required for the 1st to 3rd parts 23 to 25. Therefore, in order to adjust the required compressive strength required for the first to third parts 23 to 25 of the shock absorbing structure 20, the laminated layers of the fiber structure 21 corresponding to the first to third parts 23 to 25 The required compressive strength is desired while suppressing the manufacturing cost of the shock absorbing structure 20 without adding equipment of a loom or processing the woven fiber structure 21 in order to make the dimensions in the direction X different. Can be adjusted to the value to be used.
  • the required compression strength of the first to third parts 23 to 25 is adjusted by adjusting the number of twists of the interlayer bonding yarn 26, and the weft yarn 27a and the warp yarn 28a are not twisted. Therefore, the required compressive strength of the first to third portions 23 to 25 can be adjusted without causing a decrease in the strength of the fiber structure 21 due to twisting the weft 27a and the warp 28a.
  • the required compression strength of the first to third parts 23 to 25 is adjusted by adjusting the number of twists of the interlayer bonding yarn 26. Since the number of twists of the interlayer bonding yarn 26 can be easily adjusted, the required compression strength of the first to third portions 23 to 25 can be easily adjusted.
  • the first to third parts 23 to 25 are only classified according to the difference in the number of twists of the interlayer bonding yarn 26, and the thicknesses of the first to third parts 23 to 25 are almost the same.
  • the cross-sectional area is also almost the same.
  • the fiber structure 21 having substantially the same cross-sectional area at any position in the load input direction Z is easy to manufacture. Therefore, a shock absorbing structure obtained by manufacturing a fiber structure 21 having substantially the same thickness while adjusting the number of twists of the interlayer bonding yarn 26 to make the required compression strengths of the first to third portions 23 to 25 different.
  • the body 20 is easy to manufacture.
  • the fiber structure 21 has a square tubular shape, and the thickness of the fiber structure 21 is the same in both the load input direction Z and the direction orthogonal to the load input direction Z. Then, by setting the number of twists of the first to third interlayer bonding yarns 261 to 263 to a desired value, the required compression strength of the first to third portions 23 to 25 can be adjusted to a desired value. Therefore, even if the shock absorbing structure 20 has the same shape in the direction orthogonal to the load input direction Z and the load input direction Z, the required compression strength can be different.
  • the required compression strength can be adjusted regardless of the shape of the shock absorbing structure 20, and the degree of freedom in arrangement and use of the shock absorbing structure 20 can be adjusted.
  • the degree of freedom can be increased.
  • the fiber structure 51 of the shock absorbing structure 20 has a shape in which the dimensions gradually increase from the tip end to the base end in the load input direction Z.
  • the fiber structure 51 has a tip surface 51a on the end surface of the square frame shape to which the load is first applied, and a base end surface 51b of the square frame shape on the end surface opposite to the tip surface 51a among both ends in the load input direction Z.
  • the fiber structure 51 has a square tubular first portion 53 having a tip surface 51a, a square tubular second portion 54 continuous with the first portion 53 along the load input direction Z, and a load input direction Z. It has a square tubular third portion 55, which is continuous with the second portion 54 along the same.
  • the first portion 53, the second portion 54, and the third portion 55 have the same thickness and have a constant thickness along the load input direction Z.
  • the dimensions of the first portion 53, the second portion 54, and the third portion 55 in the direction orthogonal to the load input direction Z gradually increase in the load input direction Z. Therefore, the cross-sectional area of the first part 53 orthogonal to the load input direction Z, the cross-sectional area of the second part 54 orthogonal to the load input direction Z, and the cross-sectional area of the third part 55 orthogonal to the load input direction Z are different.
  • the cross-sectional area of the first part 53 is the smallest, and the cross-sectional area of the second part 54 is larger than that of the first part 53.
  • the cross-sectional area of the third part 55 is the largest, and is larger than the cross-sectional area of the second part 54.
  • the number of twists N1 of the first interlayer-bonded yarn 261 is set to the largest, and the number of twists N3 of the third interlayer-bonded yarn 263 is set to the smallest.
  • the twist number N2 of the second interlayer coupling yarn 262 is set to be smaller than the twist number N1 of the first interlayer coupling yarn 261 and is set to be larger than the twist number N3 of the third interlayer coupling yarn 263. Then, in the shock absorbing structure 20, required compression is performed by adjusting the size of the cross-sectional area and the number of twists of the interlayer bonding yarn 26 at the first portion 53, the second portion 54, and the third portion 55. The loads are aligned.
  • the number of twists N1 of the first interlayer binding yarn 261 and the number of twists of the second interlayer binding yarn 262 are exhibited.
  • N2 and the number of twists N3 of the third interlayer bonding yarn 263 are set to be different.
  • the shock absorbing structure 20 has a different cross-sectional area between the first portion 53, the second portion 54, and the third portion 55, the number of twists of the interlayer bonding yarn 26 is adjusted to a desired value while being different. Therefore, the required compression strengths of the first to third parts 53 to 55 can be matched.
  • each part in the load input direction Z may be changed in the first parts 23, 53, the second parts 24, 54, and the third parts 25, 55.
  • the portion where the number of twists of the interlayer bonding yarn 26 is different may be composed of only the first portion 23, 53 and the second portion 24, 54, or the number of twists is different. There may be four or more sites.
  • thermosetting resin 19 is used as the matrix resin, but other types of resins may be used.
  • the matrix material may be ceramic as well as the matrix resin.
  • the number of fiber layers to be laminated may be arbitrarily changed.
  • the shape of the fiber structures 21 and 51 does not have to be tubular, and may be columnar or plate-like in which the load direction yarn extends in the load input direction Z.
  • the shape of the fiber structures 21 and 51 does not have to be a square cylinder, and may be a cylinder or a triangle cylinder.
  • the shape of the fiber structures 21 and 51 does not have to be tubular, and may be a solid square column or triangular column.
  • the shock absorbing structure 20 may be provided between the rear bumper and the rear side member in the rear structure of the vehicle body.
  • the matrix material is a resin.
  • the fiber structure has a tubular shape, and the fiber structure 21 has the same thickness.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Vibration Dampers (AREA)
  • Woven Fabrics (AREA)

Abstract

La présente invention concerne structure d'absorption de choc dont une structure fibreuse (21) est pourvue de fils de liaison intercouche (26) qui sont des tissus multicouches et lient une pluralité de couches fibreuses dans une direction d'empilement, le fil de liaison intercouche (26) étant un fil torsadé. Dans la structure fibreuse (21), les fils de liaison intercouche (26) sont disposés côte à côte dans une direction d'entrée de charge (Z) et s'étendent dans une direction perpendiculaire à la direction d'entrée de charge (Z) et le long de la surface de la structure fibreuse (21). La structure fibreuse (21) est réglée de telle sorte que les nombres de torsions des fils de liaison intercouche (26) dans des première à troisième parties (23-25) sont différents afin d'atteindre une résistance à la compression requise des première à troisième parties (23-25) contre une charge.
PCT/JP2020/016216 2019-04-26 2020-04-10 Structure d'absorption de choc WO2020218039A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2019-084884 2019-04-26
JP2019084884A JP2020180658A (ja) 2019-04-26 2019-04-26 衝撃吸収構造体

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WO2020218039A1 true WO2020218039A1 (fr) 2020-10-29

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WO (1) WO2020218039A1 (fr)

Citations (4)

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JPH08177922A (ja) * 1994-12-26 1996-07-12 Isuzu Motors Ltd ハイブリッド化繊維強化複合材料のエネルギ吸収体
US6406088B1 (en) * 1998-11-26 2002-06-18 Lotus Cars Limited Crash rail for a vehicle
JP2015175430A (ja) * 2014-03-14 2015-10-05 帝人株式会社 樹脂製衝撃吸収部材
JP2020085234A (ja) * 2018-11-20 2020-06-04 株式会社豊田自動織機 衝撃吸収構造体

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JP2020085234A (ja) * 2018-11-20 2020-06-04 株式会社豊田自動織機 衝撃吸収構造体

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