WO2020105531A1 - Structure d'absorption de choc - Google Patents

Structure d'absorption de choc

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Publication number
WO2020105531A1
WO2020105531A1 PCT/JP2019/044645 JP2019044645W WO2020105531A1 WO 2020105531 A1 WO2020105531 A1 WO 2020105531A1 JP 2019044645 W JP2019044645 W JP 2019044645W WO 2020105531 A1 WO2020105531 A1 WO 2020105531A1
Authority
WO
WIPO (PCT)
Prior art keywords
yarns
load
shock absorbing
yarn
fragile
Prior art date
Application number
PCT/JP2019/044645
Other languages
English (en)
Japanese (ja)
Inventor
森康平
神谷隆太
井上太久真
Original Assignee
株式会社豊田自動織機
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2019084885A external-priority patent/JP2020085234A/ja
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 WO2020105531A1 publication Critical patent/WO2020105531A1/fr

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Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D21/00—Understructures, i.e. chassis frame on which a vehicle body may be mounted
    • B62D21/15—Understructures, i.e. chassis frame on which a vehicle body may be mounted having impact absorbing means, e.g. a frame designed to permanently or temporarily change shape or dimension upon impact with another body
    • 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.
  • a shock absorbing structure is arranged between the bumper and the side member of the vehicle body, and the shock absorbing structure is destroyed by breaking when the vehicle receives an excessive shock load from the bumper side. Absorbs impact energy.
  • the impact absorbing structure has a low strength against a load and is easily broken by the load in the range from the tip in the direction in which the load is applied to a predetermined position along the load direction. Further, by providing a step portion having a large thickness along the direction in which the load is applied, the strength against the load is gradually increased so that an excessive load is not applied to the driver's seat side.
  • a fiber reinforced composite material is known which is formed by impregnating a fiber structure with a matrix resin.
  • 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 leading end to have a uniform thickness, and the end of the sheet-shaped fiber layer is stepped toward the base end. By stacking them in a staggered shape, they have different thicknesses.
  • An object of the present invention is to provide a shock absorbing structure that can reduce the load generated at the step portion.
  • a shock absorbing structure for solving the above-mentioned problems is a shock absorbing structure that is configured by impregnating a fiber structure with a matrix material, and absorbs shock energy when receiving a shock load.
  • the body includes a plurality of fiber layers including a fiber layer composed of load direction yarns extending in a direction in which a load is applied.
  • a direction in which the load is applied is a load direction, and a direction orthogonal to the load direction.
  • the fibrous structure includes a step portion having a greater thickness in the stacking direction closer to the base end portion than to the tip end portion, and includes a start point of the step portion. It is a gist to provide a fragile portion whose strength is weakened as compared with a portion closer to the tip portion than the starting point.
  • the weak portion when a shock load is applied to the shock absorbing structure from the front end in the load direction, the weak portion can reduce the load generated in a part including the starting point of the step portion, and the step difference. It is possible to suppress a sudden increase in load at the part.
  • the fiber structure includes an interlayer bonding thread that bonds the plurality of fiber layers in the stacking direction, and the fragile portion is compared with a portion closer to the tip portion than the starting point. It may be formed by weakening the interlayer bond strength of the interlayer bond yarn.
  • the fragile portion may be formed with the number of fibers of the interlayer bonding yarn per unit area being smaller than those of other portions. According to this, the position where the interlayer coupling yarn penetrates in the stepped portion in the laminating direction can be easily adjusted by the loom, so that the shock absorbing structure having the fragile portion can be easily manufactured.
  • the fragile portion may be formed by making the strength of the interlayer bonding thread penetrating the fragile portion weaker than the strength of the interlayer bonding thread penetrating other portions. Good.
  • the shock absorbing structure having the fragile portion can be easily manufactured.
  • the fiber layer includes a fiber layer composed of the load direction yarns and a fiber layer composed of crossed yarns intersecting the load direction yarns, and the fragile portion is the fragile portion.
  • the strength of the crossed yarn forming the portion may be weaker than the strength of the crossed yarn at a portion closer to the tip end portion than the starting point.
  • the crossed yarn is changed in order to weaken the strength of the crossed yarn.
  • the weakened portion is provided.
  • the shock absorbing structure can be easily manufactured.
  • the fiber layer includes a fiber layer composed of the load direction yarns and a fiber layer composed of crossed yarns intersecting the load direction yarns, and the load direction per unit area is
  • the ratio of the number of the crossed yarns to the number of yarns is the orientation ratio
  • the fragile portion has the orientation ratio in the fragile portion smaller than the orientation ratio in the portion closer to the tip than the starting point. It may be formed.
  • the fiber layer includes a fiber layer composed of the load direction yarns and a fiber layer composed of crossed yarns intersecting the load direction yarns, and the fragile portion is the load
  • the direction thread may be formed to meander in the load direction.
  • the load direction thread meander by making the load direction thread meander, the magnitude of the impact load that the load direction thread can receive is reduced. Therefore, the fragile portion can be formed by controlling the load direction thread.
  • the load generated at the step can be reduced.
  • the schematic block diagram of a vehicle The perspective view which shows a shock absorption structure.
  • (A) is a figure which shows typically the state which formed the 2nd site
  • (b) is a figure which shows the state which formed the precursor in the 1st cylinder part typically
  • (A) is a figure which shows typically the state which formed the precursor in the 2nd cylinder part
  • (b) is a figure which shows the state which cut
  • the figure which shows the fiber structure of 4th Embodiment typically.
  • the figure which shows the fiber structure of another example typically.
  • a cross member 12 is provided between the front ends of side members 11 provided on both left and right sides so as to be connected in the vehicle width direction.
  • a shock absorbing structure 20 is provided at the front end of the side member 11 so as to support the bumper 13.
  • the shock absorbing structure 20 is made of fiber reinforced composite material.
  • the shock absorbing structure 20 is configured by impregnating a square tubular fiber structure 21 having a plurality of step portions with a thermosetting resin 19 as a matrix resin which is an example of a matrix material.
  • the impact absorbing structure 20 absorbs impact energy by breaking when it receives an excessive impact load along the axial direction of the tubular body.
  • the direction in which the load is applied to the shock absorbing structure 20 (the axial direction of the cylinder) is referred to as the load direction Z.
  • An epoxy resin for example, is used as the thermosetting resin 19.
  • the fiber structure 21 is made of discontinuous reinforcing fibers.
  • the discontinuous reinforcing fibers organic fibers or inorganic fibers may be used, or different types of organic fibers, different types of inorganic fibers, or mixed fiber obtained by mixing organic fibers and inorganic fibers may be used.
  • Organic fibers include acrylic fibers, nylon fibers, polyester fibers, aramid fibers, poly-p-phenylene benzobisoxazole fibers, ultra high molecular weight polyethylene fibers, and the like
  • inorganic fibers include carbon fibers, glass fibers, ceramic fibers. Etc.
  • the fibrous structure 21 has a first end face 21a on a square frame-shaped end face to which a load is first applied among both end portions in the load direction Z, and a square frame-shaped second end on the opposite end face to the first end face 21a. It has an end face 21b.
  • the fibrous structure 21 includes a square tube-shaped tip end portion 23 having a first end surface 21a, a square tube-shaped base end portion 24 having a second end surface 21b, a tip end portion 23 and a base end portion 24 in the load direction Z. And a step portion 25 in the shape of a rectangular tube.
  • the step portion 25 has three steps, and the step portion 25 is a portion in which the thickness in the stacking direction X near the base end portion 24 is thicker than the tip end portion 23 of the fiber structure 21. ..
  • the tip portion 23 is a portion that becomes a starting point of breakage when an impact load is applied.
  • the base end portion 24 is located closer to the second end surface 21b than the tip end portion 23 in the load direction Z, and is a portion that suppresses the progress of breakage when an impact load is applied.
  • the fiber structure 21 has a plurality of warp layers 28 and weft layers 27 as fiber layers.
  • the stacking direction X is the direction in which the warp layer 28 and the weft layer 27 are stacked.
  • a plurality of weft yarn layers 27 and a plurality of warp yarn layers 28 are each formed into a rectangular tube shape.
  • the weft yarn layer 27 is composed of a plurality of weft yarns 27a
  • the warp yarn layer 28 is composed of a plurality of warp yarns 28a.
  • the fiber structure 21 has the interlayer binding yarns 26 that join the plurality of weft layers 27 and the plurality of warp layers 28 in the laminating direction X.
  • each warp yarn 28a forming the warp layer 28 is a load direction yarn extending in the load direction Z.
  • the stacking direction X is a direction orthogonal to the load direction Z.
  • each of the weft yarns 27a forming the weft yarn layer 27 extends in a direction orthogonal to the direction intersecting the load direction Z.
  • the weft yarn 27a constitutes an intersecting yarn that intersects the load direction yarn.
  • the plurality of weft yarn layers 27 and the warp yarn layers 28 are laminated in a direction orthogonal to the central axis L extending in the load direction Z.
  • the number of layers of the weft yarn layer 27 and the warp layer 28 at the tip end portion 23 is smaller than that of the base end portion 24 and the step portion 25, and is the smallest in the fiber structure 21.
  • the base end portion 24 has the largest number of layers.
  • the number of layers of the weft yarn layer 27 and the warp yarn layer 28 in the step portion 25 increases from the front end portion 23 to the base end portion 24 in three stages.
  • the fibrous structure 21 has a first plate thickness portion 251 at a portion one step thicker than the tip portion 23 and a second plate thickness portion 252 at a portion one step thicker than the first plate thickness portion 251.
  • the number of laminated fiber layers in the second plate thickness portion 252 is larger than the number of laminated fiber layers in the first plate thickness portion 251, and the second plate thickness portion 252 is thicker than the first plate thickness portion 251.
  • the fiber structure 21 has a third plate thickness portion 253 at a portion thicker than the second plate thickness portion 252 by one step.
  • the number of laminated fiber layers in the third thick portion 253 is larger than the number of laminated fiber layers in the second thick portion 252, and the third thick portion 253 is thicker than the second thick portion 252.
  • the base end portion 24 is a portion that is one step thicker than the third plate thickness portion 253.
  • the number of laminated fiber layers in the base end portion 24 is larger than the number of laminated fiber layers in the third plate thickness portion 253, and the base end portion 24 is thicker than the third plate thickness portion 253.
  • the number of additional fiber layers is the same as the number of additional fiber layers for forming the proximal end portion 24.
  • the number of weft yarns 27a arranged along the load direction Z is the same for the first to third plate thickness portions 251-253, and the number of the weft yarns 27a of the first to third plate thickness portions 251-253 along the load direction Z is the same.
  • the dimensions are the same.
  • the fibrous structure 21 includes a first step surface D1 that connects the outer surface of the distal end portion 23 and the outer surface of the first thick plate portion 251, and connects the outer surface of the first thick plate portion 251 and the outer surface of the second thick plate portion 252.
  • a second step surface D2 is provided for connection.
  • the fibrous structure 21 includes a third step surface D3 that connects the outer surface of the second thick plate portion 252 and the outer surface of the third thick plate portion 253, and includes an outer surface of the third thick plate portion 253 and an outer surface of the base end portion 24.
  • a fourth step surface D4 that connects The dimensions of the first to fourth step surfaces D1 to D4 along the stacking direction X are the same.
  • the fibrous structure 21 also includes a first intersecting portion K1 at a position where the first step surface D1 and the outer surface of the first plate thickness portion 251 intersect, and the second step surface D2 and the outer surface of the second plate thickness portion 252 are provided.
  • the second intersection K2 is provided at the intersection of the two.
  • the fiber structure 21 includes a third intersection K3 at a position where the third step surface D3 and the outer surface of the third plate thickness portion 253 intersect, and a position where the fourth step surface D4 and the outer surface of the base end portion 24 intersect.
  • a fourth intersection K4 is provided.
  • the first to fourth intersections K1 to K4 have a square ring shape centered on the central axis L of the fiber structure 21.
  • first to fourth intersections K1 to K4 are intersections located on the outer side in the stacking direction X of the intersections between the outer surface of the fiber structure 21 and the step surfaces D1 to D4.
  • the first to third intersections K1 to K3 are starting points where the steps of the first to third plate thickness portions 251 to 253 start.
  • the distal end portion 23, the proximal end portion 24, and the step portion 25 are joined in the stacking direction X by an interlayer joining yarn 26.
  • the interlayer bonding yarn 26 penetrates the weft yarn layer 27 and the warp yarn layer 28 in the laminating direction X, and is folded back along the outermost and innermost weft yarns 27a in the laminating direction X.
  • the number of the weft yarn layers 27 and the warp yarn layers 28 joined by the interlayer joining yarns 26 in the laminating direction X is smallest at the front end portion 23 and largest at the base end portion 24.
  • the step portion 25 the number of the weft layers 27 and the warp layers 28 joined by the interlayer joining yarns 26 in the laminating direction X increases as the step increases.
  • the interlayer bonding yarn 26 is folded back along the outermost weft yarn 27a in the laminating direction X, and then penetrates through the distal end portion 23 and the proximal end portion 24 in the laminating direction X.
  • the interlayer coupling yarn 26 is folded back along the weft yarns 27a existing in the row of the weft yarns 27a adjacent in the loading direction Z to the weft yarn 27a folded outside in the laminating direction X. ing.
  • the inter-layer bond yarns 26 are folded back every other weft yarns 27a arranged in the load direction Z.
  • the interlocking yarns 26 are provided at regular intervals in the direction in which the weft yarns 27a extend. Therefore, the strength developed by the interlayer binding yarn 26 is constant in the extending direction of the weft yarn 27a.
  • the interlayer coupling yarn 26 is locked to the weft yarns 27a that are adjacent to the first to third step faces D1 to D3 in the load direction Z among the outermost weft yarns 27a in the stacking direction X and the load direction Z.
  • the weft yarns 27a are folded back along the weft yarns 27a in a position where a plurality of weft yarns 27a are skipped. Then, the interlayer bonding yarn 26 penetrates the first to third plate thickness portions 251 to 253 in the stacking direction X.
  • the interlayer coupling yarns 26 are arranged along the weft yarns 27a existing in the row of weft yarns 27a adjacent in the loading direction Z with respect to the weft yarns 27a folded back outside in the laminating direction X. It is folded back. Then, the interlayer coupling yarn 26 is folded back every other weft yarn 27a lined up in the load direction Z near the step surface adjacent to the load direction Z.
  • the interlocking yarns 26 are provided at regular intervals in the direction in which the weft yarns 27a extend. Therefore, the interlayer bond strength of the interlayer bond yarn 26 is constant in the extending direction of the weft yarn 27a.
  • the number of interlayer bonding yarns 26 existing per unit area is The number is smaller than that near the tip portion 23 along the load direction Z.
  • the fibrous structure 21 includes a fragile portion 29 at a portion where the number of the interlayer bonding yarns 26 is reduced.
  • the fragile portion 29 is a portion whose strength is weaker than the portion closer to the tip portion 23 than the first to third intersecting portions K1 to K3.
  • the fragile portions 29 have the same number of interlayer bonding yarns 26 per unit area.
  • the fragile portion 29 is smaller.
  • the fragile portion 29 is smaller.
  • the number of the interlayer bonding yarns 26 existing in the fragile portion 29 of the third plate thickness portion 253 and the second plate thickness With respect to the number of interlayer coupling yarns 26 existing in the portion of the portion 252 near the third step surface D3, the number of the weakened portions 29 is smaller.
  • the interlayer binding yarns 26 are folded back every other weft yarns 27a lined up in the load direction Z, and the interlayer binding yarns 26 are present between the weft yarns 27a adjacent to each other in the load direction Z, as in a region other than the fragile portion 29. Compared with, the number of the inter-layer bond yarns 26 existing along the load direction Z in the fragile portion 29 is small.
  • the interlayer bond yarn 26 By the interlayer bond yarn 26 extending in the laminating direction X, the interlayer bond yarn 26 has strength in the load direction Z, and when an impact load is applied, the interlayer bond yarn 26 develops strength.
  • the strength developed by the yarn 26 in the load direction Z is weakened.
  • the number of the interlayer bonding yarns 26 is reduced in the weak portion 29 near the first to third step surfaces D1 to D3, and The bonding strength is weakened, and the strength in the load direction Z is weaker than that of the portion other than the fragile portion 29.
  • the inter-layer bond yarn 26, the weft yarn 27a, and the warp yarn 28a are all composed of fiber bundles (multifilaments) made of the same material.
  • a fiber bundle made of carbon fibers is used for the interlayer bonding yarn 26, the weft yarn 27a, and the warp yarn 28a.
  • the carbon fiber bundle is composed of hundreds to tens of thousands of thin fibers to form one fiber bundle, and the number of fibers suitable for the required performance is selected.
  • the shock load is applied to the shock absorbing structure 20 via the bumper 13.
  • the shock absorbing structure 20 absorbs shock energy by causing local damage to the tip portion 23 and the step portion 25. After that, the base end portion 24 suppresses the progress of breakage.
  • the fragile portion 29 is provided in a part including the first to third intersecting portions K1 to K3. Then, the number of interlayer bonding yarns 26 existing in the weakened portion 29 is made smaller than the number of interlayer bonding yarns 26 existing in a portion closer to the tip end portion 23 along the load direction Z than the weakened portion 29.
  • the fragile portion 29 is configured by reducing the number of interlayer bonding yarns 26 penetrating the fragile portion 29 in the laminating direction X as compared with the portions other than the fragile portion 29.
  • the position where the interlayer bonding yarn 26 penetrates can be easily adjusted by the loom, and the fragile portion 29 can be easily manufactured. Therefore, it is possible to easily manufacture a configuration in which the load is prevented from rapidly increasing near the first to third step surfaces D1 to D3 by the loom.
  • the interlayer bonding yarn 26 is folded back along the weft yarn 27a adjacent to the first to third step faces D1 to D3 and extends along the first to third step faces D1 to D3. For this reason, in the fragile portion 29, it is possible to suppress the weft layer 27 and the warp layer 28 from being scattered near the first to third step surfaces D1 to D3 while reducing the number of the interlayer coupling yarns 26.
  • the interlayer bonding yarn 26 does not fly a plurality of weft yarns 27a in the load direction Z near the first to third step surfaces D1 to D3 in the load direction Z, Every other weft yarn 27a arranged in the load direction Z is folded back. Therefore, in the second embodiment, the fragile portion 29 is not formed by reducing the number of the interlayer coupling yarns 26.
  • the weft yarns 27a adjacent to the first to third step surfaces D1 to D3 near the base end portion 24 in the load direction Z are used as the weak portion weft yarns 27b, and the other weft yarns 27a are directly used as the weft yarns 27a.
  • the weakened portion 29 is formed by making the strength of the weakened portion weft yarn 27b lower than the strength of the weft yarn 27a.
  • the weft yarn 27a, the warp yarn 28a, and the interlayer bonding yarn 26 are a fiber bundle of carbon fibers. Then, the type of carbon fiber of the weak portion weft 27b is set to have a lower strength than the carbon fibers of the other wefts 27a.
  • the weak portion weft yarn 27b may be made of nylon having lower strength than the carbon fiber, and the weft yarn 27a may be made of carbon fiber.
  • the strength of the fragile part weft yarn 27b forming the fragile part 29 is made lower than the strength of the weft yarn 27a forming the other part. Since the change of the weft yarn 27a and the weak portion weft yarn 27b can be easily adjusted by the loom, the shock absorbing structure 20 having the weak portion 29 can be easily manufactured.
  • the fibrous structure 30 of the shock absorbing structure 20 includes a first tubular portion 31 having a rectangular tubular shape and a second tubular portion having a rectangular tubular shape stacked on the outer peripheral surface of the first tubular portion 31. 32, and.
  • the fibrous structure 30 includes a square tubular third tubular portion 33 stacked on the outer circumferential surface of the second tubular portion 32 and a square tubular fourth tubular portion 34 stacked on the outer circumferential surface of the third tubular portion 33.
  • a square tubular fifth tubular portion 35 stacked on the outer peripheral surface of the fourth tubular portion 34.
  • the one end surface of the first tubular portion 31 in the load direction Z constitutes the first end surface 30a.
  • the other end surface of the first to fifth tubular portions 31 to 35 in the load direction Z constitutes the second end surface 30b.
  • one end surface of the second tubular portion 32 in the load direction Z is displaced from the one end surface of the first tubular portion 31 in the load direction Z toward the second end surface 30b.
  • one end surface of the third tubular portion 33 in the load direction Z is displaced from the one end surface of the second tubular portion 32 in the load direction Z toward the second end surface 30b.
  • one end surface of the fourth tubular portion 34 in the load direction Z is displaced from the one end surface of the third tubular portion 33 in the load direction Z toward the second end surface 30b.
  • one end surface of the fifth tubular portion 35 in the load direction Z is displaced from the one end surface of the fourth tubular portion 34 in the load direction Z toward the second end surface 30b.
  • the tip portion 41 is formed by a portion of the first tubular portion 31 near the first end surface 30a.
  • a first step surface D1 is formed by the end surface of the second tubular portion 32 near the first end surface 30a.
  • the first intersecting portion K1 is formed by the intersecting portion of the end surface of the second tubular portion 32 near the first end surface 30a and the peripheral surface.
  • the second step surface D2 is formed by the end surface of the third tubular portion 33 near the first end surface 30a.
  • a second intersecting portion K2 is formed by the intersecting portion of the end surface of the third tubular portion 33 near the first end surface 30a and the peripheral surface.
  • a third step surface D3 is formed by the end surface of the fourth tubular portion 34 near the first end surface 30a.
  • the third intersecting portion K3 is formed by the intersecting portion of the end surface of the fourth tubular portion 34 near the first end surface 30a and the peripheral surface.
  • a fourth step surface D4 is formed by the end surface of the fifth tubular portion 35 near the first end surface 30a.
  • the fourth intersecting portion K4 is formed by the intersecting portion of the end surface of the fifth tubular portion 35 near the first end surface 30a and the peripheral surface.
  • the first plate thickness portion 251 is configured by a portion where the first tubular portion 31 and the second tubular portion 32 overlap
  • the second plate thickness portion 252 includes the first tubular portion 31 and the second tubular portion.
  • 32 and the third cylindrical portion 33 are configured to overlap each other.
  • the third plate thickness portion 253 is configured by a portion where the first tubular portion 31, the second tubular portion 32, the third tubular portion 33, and the fourth tubular portion 34 overlap
  • the base end portion 42 is the first tubular portion.
  • the second tubular portion 32, the third tubular portion 33, the fourth tubular portion 34, and the fifth tubular portion 35 overlap each other.
  • the fibrous structure 30 includes a fragile portion 40 in a part including the first to third intersecting portions K1 to K3.
  • the ratio of the number of weft yarns 27a to the number of warp yarns 28a per unit area is defined as the orientation ratio.
  • the fragile portion 40 is formed such that the orientation ratio of the fragile portion 40 is smaller than the orientation ratio of the portion closer to the tip portion 41 than the first to third intersecting portions K1 to K3.
  • the ratio of the number of warp yarns 28a to the number of weft yarns 27a per unit area is 1: 2, and the orientation ratio is 0.5.
  • the ratio of the number of warp yarns 28a other than the weak portion 40 to the number of weft yarns 27a is 2: 1 and the orientation ratio is 2.
  • the first to fourth cylindrical portions 31 to 34 have a first portion 36 having an orientation ratio of 0.5 and a first portion 36 having an orientation ratio of 2 by adjusting the number of the weft yarns 27a and the warp yarns 28a. And two parts 37.
  • the first tubular portion 31 includes a second portion 37 at a portion that constitutes the tip portion 41 of the fiber structure 30.
  • the first tubular portion 31 includes a first portion 36 in a portion forming the fragile portion 40 among portions forming the first plate thickness portion 251, and a second portion 37 in a portion forming a portion other than the fragile portion 40. Equipped with.
  • the first tubular portion 31 includes a first portion 36 in a portion that constitutes the fragile portion 40 among portions that configure the second plate thickness portion 252, and a second portion 37 in a portion that constitutes a portion other than the fragile portion 40. Equipped with.
  • the first tubular portion 31 includes a first portion 36 in a portion that constitutes the fragile portion 40 among portions that configure the third plate thickness portion 253, and a second portion 37 in a portion that constitutes a portion other than the fragile portion 40. Equipped with.
  • the second portion 37 forming the third plate thickness portion 253 also forms the base end portion 42 of the fiber structure 30.
  • the second tubular portion 32 includes a first portion 36 in a portion forming the fragile portion 40 among portions forming the first plate thickness portion 251, and a second portion 37 in a portion forming a portion other than the fragile portion 40. Equipped with.
  • the second tubular portion 32 includes a first portion 36 in a portion forming the fragile portion 40 among portions forming the second plate thickness portion 252, and a second portion 37 in a portion forming a portion other than the fragile portion 40. Equipped with.
  • the second tubular portion 32 includes a first portion 36 in a portion that constitutes the fragile portion 40 among portions that configure the third plate thickness portion 253, and a second portion 37 in a portion that constitutes a portion other than the fragile portion 40. Equipped with.
  • the second portion 37 that constitutes the third plate thickness portion 253 also constitutes the base end portion 42 of the fiber structure 30.
  • the third tubular portion 33 includes a first portion 36 in a portion that constitutes the fragile portion 40 among portions that configure the second plate thickness portion 252, and a second portion 37 in a portion that constitutes a portion other than the fragile portion 40. Equipped with.
  • the third tubular portion 33 includes a first portion 36 in a portion forming the fragile portion 40 among portions forming the third plate thickness portion 253, and a second portion 37 in a portion forming a portion other than the fragile portion 40. Equipped with.
  • the second portion 37 that constitutes the third plate thickness portion 253 also constitutes the base end portion 42 of the fiber structure 30.
  • the fourth tubular portion 34 includes a first portion 36 in a portion forming the fragile portion 40 among portions forming the third plate thickness portion 253, and a second portion 37 in a portion forming a portion other than the fragile portion 40. Equipped with.
  • the second portion 37 that constitutes the third plate thickness portion 253 also constitutes the base end portion 42 of the fiber structure 30.
  • the fifth tubular portion 35 is entirely formed by the second portion 37.
  • the fragile portion 40 of the first thick plate portion 251 is composed of the first portion 36 of the first tubular portion 31 and the first portion 36 of the second tubular portion 32, and other than the fragile portion 40 of the first thick plate portion 251.
  • the portion is composed of the second portion 37 of the first tubular portion 31 and the second portion 37 of the second tubular portion 32.
  • the fragile portion 40 of the second plate thickness portion 252 is composed of the first portion 36 of the first to third tubular portions 31 to 33, and the portions of the second plate thickness portion 252 other than the fragile portion 40 are the first to third portions. It is composed of the second portion 37 of the three tubular portions 31 to 33.
  • the fragile portion 40 of the third thick plate portion 253 is composed of the first portion 36 of the first to fourth tubular portions 31 to 34, and the portions other than the fragile portion 40 of the third thick plate portion 253 are the first to the third portion. It is composed of the second portion 37 of the four tubular portions 31 to 34.
  • the method of manufacturing the fragile portion 40 will be described by embodying the method of manufacturing the fragile portion 40 of the first plate thickness portion 251.
  • the first tubular portion 31 is manufactured.
  • eight warp layers 28 are manufactured in the laminating direction X, and one weft layer 27 is put on each of the outer sides of the warp layers 28 at both ends in the laminating direction X.
  • one weft layer 27 is inserted between the third warp layer 28 and the fourth warp layer 28 from both ends of the warp layer 28 in the laminating direction X.
  • eight warp layers 28 and four weft layers 27 are formed, and the second portion 37 having an orientation ratio of 2 is woven.
  • the eight warp layers 28 and the four weft layers 27 are bonded in the laminating direction X by the interlayer bonding yarns 26.
  • the first portion 36 is formed continuously with the second portion 37.
  • the second warp layer 28 from both ends in the laminating direction X and the laminating direction X more than the warp layers 28.
  • One weft layer 27 is inserted between the adjacent warp layers 28 on the inner side of each.
  • the third warp layer 28 from both ends in the laminating direction X and the fourth warp layer 28 that is adjacent to the warp layers 28 inside the laminating direction X with respect to the warp layers 28.
  • Two weft yarn layers 27 are inserted between the warp yarn layers 28 and the warp yarn layers 28.
  • two weft layers 27 are inserted between the fourth warp layers 28 from both ends in the laminating direction X. Then, the eight weft layers 27 and the eight warp layers 28 are woven to form the precursor 36a of the first portion 36. The eight weft layers 27 and the eight warp layers 28 are bound by the inter-layer binding yarns 26 in the laminating direction X.
  • the second portion 37 is formed continuously with the precursor 36a of the first portion 36 by the same method as described above.
  • the precursor 36a of the first portion 36, the second portion 37, the precursor 36a of the first portion 36, and the second portion 37, which are not shown, are woven in the same manner as above.
  • the entire first tubular portion 31 is configured.
  • the warp layers 28 at both ends in the laminating direction X and the first warp layer 28 from both ends in the first portion 36 of each precursor 36a The warp yarn 28a forming the precursor 36a is cut off.
  • four warp layers 28 and eight weft layers 27 are formed, and the first portion 36 is formed from the precursor 36 a of the first portion 36.
  • the second tubular portion 32 is manufactured. As shown in FIG. 8A, eight warp layers 28 are manufactured in the laminating direction X. Of the eight warp layers 28, between the second warp layer 28 from both ends in the laminating direction X and the third warp layer 28 adjacent to the inner side of the warp layers 28 in the laminating direction X, respectively. One weft layer 27 is inserted.
  • the eight warp layers 28 between the third warp layer 28 from both ends in the laminating direction X and the fourth warp layer 28 adjacent to the inner side of the warp layers 28 in the laminating direction X.
  • Two weft layers 27 are inserted in each of the layers.
  • Two weft layers 27 are inserted between the fourth warp layers 28 from both ends in the laminating direction X.
  • eight weft layers 27 are formed, and the precursor 36a of the first portion 36 is formed.
  • the eight weft layers 27 are bonded in the laminating direction X by the interlayer bonding yarns 26.
  • the second portion 37 is formed continuously with the precursor 36a of the first portion 36.
  • one weft layer 27 is provided outside each of the warp layers 28 at both ends in the laminating direction X. Weft insert. Further, one weft layer 27 is provided between the third warp layer 28 from both ends in the laminating direction X and the fourth warp layer 28 adjacent to the warp layers 28 on the inner side in the laminating direction X. Weft insert. Then, the four weft layers 27 are formed, and the second portion 37 including the eight warp layers 28 and the four weft layers 27 is woven. The four weft yarn layers 27 are joined in the laminating direction X by the interlayer joining yarn 26.
  • the precursor 36a of the first portion 36, the second portion 37, the precursor 36a of the first portion 36, and the second portion 37 are formed by the same method as described above.
  • the warp yarns 28a forming the precursors 36a are cut off from each of the two warp yarn layers 28 from both ends in the laminating direction X.
  • four warp layers 28 and eight weft layers 27 are formed, and the first portion 36 is formed from the precursor 36a.
  • the second portion 37 near one end of the first tubular portion 31 is left and the first portion 36 continuous with the second portion 37 is formed.
  • the first portion 36 near the one end of the second tubular portion 32 is stacked.
  • the second portion 37 of the first tubular portion 31 and the second portion 37 of the second tubular portion 32 are stacked.
  • the front end portion 41 is formed and the first plate thickness portion 251 is formed.
  • the tip 41 is formed by the second portion 37 of the first tubular portion 31.
  • the tip portion 41 is formed of eight warp layers 28 and four weft layers 27. Therefore, the tip portion 41 has an orientation ratio of 2.
  • the fragile portion 40 of the first plate thickness portion 251 is formed of the first portion 36 of the first tubular portion 31 and the first portion 36 of the second tubular portion 32, and has eight warp layers 28 and 16 layers. It is formed by the weft layer 27. Therefore, the fragile portion 40 of the first plate thickness portion 251 has an orientation ratio of 0.5.
  • the parts other than the fragile part 40 of the first plate thickness part 251 are formed by the second part 37 of the first tubular part 31 and the second part 37 of the second tubular part 32, and the 16 warp layers 28 and 8 are formed. It is formed by a layer of weft yarns 27. Therefore, the orientation ratio of the portion of the first plate thickness portion 251 other than the fragile portion 40 is 2.
  • the second plate thickness part 252, the third plate thickness part 253, and the base end part 24 are formed by stacking the third cylinder part 33, the fourth cylinder part 34, and the fifth cylinder part 35 formed as described above. Has been done.
  • the weaving method for the first portion 36 and the second portion 37 is the same as the above, and therefore detailed description thereof is omitted.
  • the third embodiment it is possible to obtain the same effects as the effects described in (1-1) and (1-3) of the first embodiment.
  • (3-1) In the first to third plate thickness portions 251-253, the orientation ratio of the fragile portion 40 is made smaller than the orientation ratio of the other portions. Therefore, the fragile portion 40 can be formed by adjusting the numbers of the weft yarns 27a and the warp yarns 28a. Therefore, the shock absorbing structure 20 including the fragile portion 40 can be easily manufactured.
  • the warp yarns 28a are alternately engaged with the weft yarns 27a arranged in the load direction Z. For this reason, the warp yarn 28a meanders along the load direction Z in the fragile portion 29.
  • the warp yarns 28a extend straight in the load direction Z in the portions other than the fragile portion 29 of the first to third plate thickness portions 251 to 253.
  • the warp yarn 28a meanders along the load direction Z.
  • the strength of the warp yarn 28a against a load decreases as compared with the case where the warp yarn 28a does not meander. Therefore, when a load is applied to the shock absorbing structure 20 from the tip end 23 side, the load generated in the vicinity of the first to third step surfaces D1 to D3 is reduced, and by extension, the first to third step surface D1. It is possible to prevent the load from rapidly increasing in the vicinity of D3.
  • the present embodiment can be modified and implemented as follows.
  • the present embodiment and the following modified examples can be implemented in combination with each other within a technically consistent range.
  • the fiber structure 21 is manufactured such that the tip end portion 23, the base end portion 24, and the step portion 25 have the same number of the inter-layer bonding yarns 26 existing per unit area.
  • the fragile portion 29 may be manufactured by cutting off the interlayer coupling yarn 26 existing in the portion forming the fragile portion 29.
  • the fiber structure 21 is manufactured such that the tip 23, the base 24, and the step 25 have the same number of interlayer bonding yarns 26 existing per unit area.
  • the fragile portion 29 may be manufactured by making the type of the interlayer bonding yarn 26 existing in the portion forming the fragile portion 29 different from the types of the other interlayer bonding yarns 26.
  • the interlayer coupling yarn 26 is formed by a yarn configured as a part of the weft yarn 27a.
  • the inter-layer bond yarn 26 present in the fragile portion 29 is formed of a fiber bundle whose strength is weaker than that of the inter-layer bond yarn 26 present in other parts, for example, a fiber bundle thinner than the weft yarn 27a, It is a fiber bundle made of nylon. According to this, the change of the inter-layer bond yarn 26 can be easily adjusted by the loom, so that the shock absorbing structure 20 having the fragile portion 29 can be easily manufactured.
  • the fiber structure 21 is manufactured such that the tip 23, the base 24, and the step 25 have the same number of interlayer bonding yarns 26 existing per unit area.
  • the fragile portion 29 may be manufactured by reducing the number of fibers of the interlayer coupling yarn 26 existing in the portion forming the fragile portion 29 as compared with the number of fibers of the interlayer coupling yarn 26 in other portions.
  • the interlayer bonding yarn 26 cannot be continuously inserted in the load direction Z, and therefore the type of the interlayer bonding yarn 26 inserted in the middle of the load direction Z is changed.
  • the number of the interlayer bonding yarns 26 per unit area is the same between the fragile portions 29, but between the fragile portions 29.
  • the number of inter-layer bond yarns 26 per unit area may be different. For example, the larger the increase rate of the thickness of the step portion 25 along the load direction Z, the smaller the number of the interlayer bonding yarns 26 in the weakened portion 29 may be.
  • the number of interlayer bonding yarns 26 existing in the weakened portion 29 is smaller than the number of interlayer bonding yarns 26 existing in a portion closer to the tip end 23 along the load direction Z than the weakened portion 29.
  • the interlayer bonding yarn 26 existing in the weakened portion 29 may be formed of a fiber bundle having a lower strength than the interlayer bonding yarns 26 existing in other portions.
  • the weft yarn 27a is a twisted yarn, and the number of twists of the weft yarn 27a that constitutes the fragile portions 29 and 40 constitutes a portion closer to the tip end portion 23, 41 than the first to third intersecting portions K1 to K3. It may be smaller than the number of twists of the weft yarn 27a.
  • the elongation rate increases as the number of twists increases up to a certain number of twists.
  • the larger the elongation of the weft yarn 27a the easier the cracking of the fibrous structures 21 and 30 when an impact load is applied.
  • the strength against the impact load is increased. Therefore, by reducing the number of twists of the weft yarns 27a forming the fragile portions 29 and 40, when the impact load is applied from the tip portions 23 and 41, the fragile portions 29 and 40 cause the first to third step surfaces D1. It is possible to reduce the load generated in the vicinity of D1 to D3, and to suppress the load from rapidly increasing in the vicinity of the first to third step surfaces D1 to D3.
  • the method for changing the orientation ratio is not limited to the method of stacking the first to fifth cylindrical portions 31 to 35 having the first portion 36 and the second portion 37. Good.
  • the number of the weft layers 27 to be put in the weft may be adjusted and the number of the warp layers 28 may be adjusted to form the fibrous structure 30.
  • thermosetting resin 19 is used as the matrix resin, but other types of resins may be used.
  • the matrix material may be ceramic other than matrix resin.
  • the number of fiber layers to be laminated may be changed arbitrarily.
  • the shape of the fiber structures 21 and 30 does not have to be cylindrical, and may be columnar or plate-like in which the load direction yarn extends in the load direction Z.
  • the shape of the fiber structures 21 and 30 does not have to be a square cylinder, but may be a cylinder or a triangle cylinder.
  • thermosetting resin as a matrix resin which is an example of matrix material
  • shock absorbing structure 21 shock absorbing structure 21, 30 fiber Structure 23 Tip, 41 24, 42 Base end portion 25
  • Step portion 26 Interlayer binding yarn 27 Weft layer as a fiber layer 27a Weft yarn as a crossing yarn 28 Warp layer as a fiber layer 28a Warp yarn as a load direction yarn 29 Weak portion

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Vibration Dampers (AREA)
  • Woven Fabrics (AREA)

Abstract

La présente invention concerne une structure fibreuse (21) de cette structure d'absorption de choc (20), ladite structure fibreuse présentant une forme cylindrique et comportant : une pluralité de couches de chaîne (28) ayant des chaînes (28a) s'étendant dans une direction de charge Z ; des couches de trame (27) ayant des trames (27a) perpendiculaires aux chaînes (28a) et un fil de liaison intercouche (26) qui lie la pluralité de couches de trame (27) et les couches de chaîne (28) dans une direction de stratification (X). La structure fibreuse (21) est pourvue d'une section étagée (25) dans laquelle l'épaisseur d'une partie adjacente à une section d'extrémité de base (24) est plus importante que celle d'une partie adjacente à une section de pointe (23) dans la direction de stratification (X). La structure fibreuse (21) est pourvue d'une section peu solide (29) sur une partie comprenant la première jusqu'à la troisième intersection (K1 à K3) de la section étagée (25).
PCT/JP2019/044645 2018-11-20 2019-11-14 Structure d'absorption de choc WO2020105531A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2018217160 2018-11-20
JP2018-217160 2018-11-20
JP2019-084885 2019-04-26
JP2019084885A JP2020085234A (ja) 2018-11-20 2019-04-26 衝撃吸収構造体

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WO2020105531A1 true WO2020105531A1 (fr) 2020-05-28

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05288232A (ja) * 1992-04-09 1993-11-02 Toyoda Gosei Co Ltd 樹脂製衝撃吸収部材
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
JP2003262246A (ja) * 2001-12-01 2003-09-19 Daimler Chrysler Ag 繊維複合衝撃吸収構造体
JP2016090011A (ja) * 2014-11-10 2016-05-23 小島プレス工業株式会社 衝撃吸収部材
JP2017002998A (ja) * 2015-06-10 2017-01-05 マツダ株式会社 衝撃吸収用炭素繊維樹脂構造体

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05288232A (ja) * 1992-04-09 1993-11-02 Toyoda Gosei Co Ltd 樹脂製衝撃吸収部材
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
JP2003262246A (ja) * 2001-12-01 2003-09-19 Daimler Chrysler Ag 繊維複合衝撃吸収構造体
JP2016090011A (ja) * 2014-11-10 2016-05-23 小島プレス工業株式会社 衝撃吸収部材
JP2017002998A (ja) * 2015-06-10 2017-01-05 マツダ株式会社 衝撃吸収用炭素繊維樹脂構造体

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