WO2015079876A1 - Automobile bumper - Google Patents

Automobile bumper Download PDF

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Publication number
WO2015079876A1
WO2015079876A1 PCT/JP2014/079328 JP2014079328W WO2015079876A1 WO 2015079876 A1 WO2015079876 A1 WO 2015079876A1 JP 2014079328 W JP2014079328 W JP 2014079328W WO 2015079876 A1 WO2015079876 A1 WO 2015079876A1
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WO
WIPO (PCT)
Prior art keywords
bumper beam
vehicle width
width direction
bumper
bottom wall
Prior art date
Application number
PCT/JP2014/079328
Other languages
French (fr)
Japanese (ja)
Inventor
重人 安原
柏木　正和
裕介 前迫
忠行 内田
朋也 彌武
潤一郎 荒木
健 中根
Original Assignee
本田技研工業株式会社
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
Application filed by 本田技研工業株式会社 filed Critical 本田技研工業株式会社
Priority to JP2015550628A priority Critical patent/JP6120460B2/en
Publication of WO2015079876A1 publication Critical patent/WO2015079876A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B29C43/20—Making multilayered or multicoloured articles
    • 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
    • B60R19/18—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects characterised by the cross-section; Means within the bumper to absorb impact
    • 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
    • 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
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
    • B29L2031/3044—Bumpers
    • 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
    • B60R19/18—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects characterised by the cross-section; Means within the bumper to absorb impact
    • B60R2019/1806—Structural beams therefor, e.g. shock-absorbing
    • 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
    • B60R2019/247—Fastening of bumpers' side ends

Definitions

  • the present invention is directed to an automobile, in which a bumper beam having a W-shaped cross section or a U-shaped cross section is formed by laminating a discontinuous fiber reinforced resin sheet containing discontinuous fibers and a continuous fiber reinforced resin sheet containing continuous fibers. About the bumper.
  • a bumper beam made of fiber reinforced resin having a U-shaped cross section or a W-shaped cross section which opens forward or backward the bumper beam is prevented from opening deformation when a collision load in the front-rear direction is input. Therefore, various proposals have been made to increase the strength of the bumper beam to improve the collision energy absorption performance.
  • ribs are formed longitudinally and laterally inside a bumper beam having a W-shaped cross section opened forward, and the inner surface of the bumper face is made of molten resin at the front end of the bumper beam. A combination is proposed.
  • Patent Document 2 a bumper beam having a W-shaped cross section which is opened rearward by forming a thermoplastic resin and a resin sheet containing continuous fibers in an overlapping manner is formed, and the upper and lower sides of the W-shaped cross section It has been proposed to increase the thickness locally by adding a resin sheet containing thermoplastic resin or continuous fibers at the end of the sheet.
  • Patent Document 3 proposes that a longitudinal reinforcing rib and an oblique reinforcing rib are formed inside a bumper beam having a U-shaped cross section opened forward.
  • a bumper beam having a U-shaped cross section which is opened forward is configured by overlapping a resin sheet containing continuous fibers and a resin sheet containing discontinuous fibers, and press-forming the same. It has been proposed to form longitudinal ribs and transverse ribs made of a resin sheet containing discontinuous fibers inside.
  • Patent Document 5 while forming a plurality of longitudinally extending ribs inside a bumper beam having a U-shaped cross section opened forward, a large number of beams extending in the vehicle width direction are formed in a longitudinal wall portion at the rear end. It has been proposed that the formation of
  • Patent Documents 1, 4 and 5 it is necessary to form a large number of longitudinal ribs at short intervals in the vehicle width direction in order to prevent the bumper beam from being deformed by opening at the time of collision load input. Not only is the molding difficult when the fiber reinforced resin has a continuous fiber layer, but there is also the problem that the weight is increased and the merit of using a bumper beam made of a fiber reinforced resin can not be utilized.
  • the present invention has been made in view of the above-described circumstances, and it is an object of the present invention to increase bending strength by preventing the opening deformation of a bumper beam while minimizing the increase in weight.
  • a bumper beam having a W-shaped cross section or a U-shaped cross section, a discontinuous fiber reinforced resin sheet containing discontinuous fibers, and a continuous fiber reinforced resin containing continuous fibers
  • An automotive bumper comprising a stack of sheets, wherein the bumper beam comprises a vertically positioned bottom wall and side walls extending horizontally from upper and lower ends of the bottom wall, and the thickness of the bottom wall
  • a bumper for an automobile according to a first feature of the present invention is proposed to be larger than the thickness of the side wall.
  • the thickness of the bottom wall can be made of the side wall.
  • An automotive bumper is proposed, which is characterized in that it has a second feature greater than its thickness.
  • the thickness of the bottom wall is made according to a third aspect of the present invention.
  • the thickness of the bottom wall in the vehicle width direction according to the distribution of the bending moment acting on the bumper beam by the collision load An automotive bumper is proposed, the fourth characteristic of which is changed.
  • the bumper beam has a central curved portion concavely curved outward in the longitudinal direction at a central portion in the vehicle width direction, and a vehicle width direction of the central curved portion.
  • the bumper beam extension connecting portion includes a pair of left and right curved portions convexly curved toward the front and rear direction outside on both sides, and the left and right curved portions are connected to the bumper beam extension located on the outer side in the vehicle width direction.
  • the bumper beam includes an upper folded portion formed by folding the upper flange inward in the front-rear direction and a lower folded portion formed by folding the lower flange in the front-rear direction.
  • the bumper beam extension connection portion is fastened to the main body of the bumper beam extension at least at the fastening point on the inner side in the vehicle width direction and the fastening point on the outer side in the vehicle width direction, and the vehicle width direction outer end of the upper folded portion and the lower folded portion is According to a sixth aspect of the present invention, there is provided a bumper for a motor vehicle, which ends in the vicinity of the fastening point on the inner side in the vehicle width direction.
  • the bumper beam extension 12 of the embodiment corresponds to the shock absorbing member of the present invention
  • the upper wall 14b and the lower wall 14c of the embodiment correspond to the side wall of the present invention
  • the rivet 35 of the embodiment is the present invention
  • the bumper beam extension connection portion B1 of the embodiment corresponds to the shock absorbing member connection portion of the present invention.
  • a bumper for an automobile comprises a bumper beam having a W-shaped cross section or a U-shaped cross section, a discontinuous fiber reinforced resin sheet containing discontinuous fibers, a continuous fiber reinforced resin sheet, It is configured by laminating
  • the bumper beam has a vertically positioned bottom wall and side walls extending horizontally from the upper and lower ends of the bottom wall, and the thickness of the bottom wall is larger than the thickness of the side wall, thereby minimizing the increase in weight
  • the rigidity of the bumper beam against bending deformation in the horizontal direction can be efficiently enhanced, and the impact energy absorbing performance can be improved.
  • the thickness of the bottom wall is made larger than the thickness of the side wall.
  • the amount of continuous fibers can be increased to increase the strength against tensile loading.
  • the thickness of the bottom wall is larger than the thickness of the side wall Therefore, the amount of discontinuous fibers can be increased to increase the strength against compressive load.
  • the thickness of the bottom wall is changed in the vehicle width direction according to the distribution of bending moment acting on the bumper beam due to the collision load, so the strength of the bumper beam in the vehicle width direction
  • the distribution can be optimized to reduce the weight.
  • the bumper beam has a central curved portion concavely curved outward in the longitudinal direction at a central portion in the lateral direction of the vehicle and a lateral curved outer side on both sides in the lateral direction of the central curved portion.
  • the bumper beam extension connection part located on the outer side in the vehicle width direction and connected to the bumper beam extension Since the bumper beam and the load input portion that protrudes most to the outer side in the bumper beam are provided, by receiving the collision load in the front and rear direction with the left and right load input portions, the bumper beam extension connection from the load input portion to which the load is input Reduces the bending moment acting on the bumper beam due to collision load by reducing the distance to the part and reduces the required strength of the bumper beam It is possible to reduce the weight of Te.
  • the bumper beam is provided with the upper folded portion formed by folding the upper flange inward in the front-rear direction and the lower folded portion formed by folding the lower flange in the longitudinal direction, the bumper beam It is possible to prevent the opening deformation without providing a special reinforcing rib or the like, and to prevent the occurrence of a crack or a failure due to the concentration of stress on both sides in the vehicle width direction of the opening deformed part.
  • the bumper beam extension connection portion is fastened to the main body of the bumper beam extension at least at the fastening point inside the vehicle width direction and the fastening point outside the vehicle width direction, and the vehicle width direction outer end of the upper folded portion and the lower folded portion is the vehicle width Since the terminal ends near the fastening point on the inner side, when the collision load in the front and rear direction is input, the fastening point on the outer side in the vehicle width direction of the bumper beam acts on the bumper beam from the bumper beam extension to the bumper beam By doing this, it is possible to reduce the maximum value of the bending moment acting on the bumper beam and to prevent local breakage.
  • FIG. 1 is a perspective view of a bumper beam and a bumper beam extension.
  • First Embodiment FIG. 2 is a view in the direction of arrows in FIG.
  • First Embodiment FIG. 3 is an enlarged sectional view taken along line 3-3 of FIG.
  • First Embodiment FIG. 4 is an enlarged view of part 4 of FIG.
  • First Embodiment FIG. 5 is an enlarged sectional view taken along line 5-5 of FIG.
  • First Embodiment 6 is an enlarged cross-sectional view taken along line 6-6 of FIG.
  • First Embodiment FIG. 7 is a cross-sectional view of a mold for forming a bumper beam.
  • First Embodiment FIG. 8 is a diagram corresponding to FIG. Second Embodiment FIG.
  • FIG. 9 is a perspective view of a bumper beam and a bumper beam extension.
  • Third Embodiment FIG. 10 is a view in the direction of arrow 10 in FIG.
  • Third Embodiment FIG. 11 is an enlarged view of an arrow 11 in FIG.
  • Third Embodiment 12 is an enlarged sectional view taken along line 12-12 of FIG.
  • Third Embodiment FIG. 13 is an enlarged sectional view taken along line 13-13 of FIG.
  • Third Embodiment FIG. 14 is an enlarged sectional view taken along line 14-14 of FIG.
  • Third Embodiment FIG. 15 is an enlarged sectional view taken along line 15-15 of FIG.
  • Third Embodiment FIG. 16 is a cross-sectional view of a mold for forming a bumper beam.
  • Third Embodiment FIG. 17 is an explanatory view of a bending moment acting on the bumper beam by the collision load.
  • Third Embodiment FIG. 18 is a diagram corresponding to FIG. Fourth Embodiment
  • bumper beam 12 bumper beam extension (impact absorbing member) 14a bottom wall 14b top wall (side wall) 14c Lower wall (side wall) 14d upper flange 14e lower flange 14g upper folded portion 14h lower folded portion 15 continuous fiber reinforced resin sheet 16 discontinuous fiber reinforced resin sheet 17 second continuous fiber reinforced resin sheet 33a 'main body 35 rivet (fastening point) A Central curved portion B Left and right curved portion B1 Bumper beam extension connection portion (impact absorption member connection portion) B2 Load input section T1 Bottom wall thickness T2 Side wall thickness
  • the front-rear direction, the left-right direction (vehicle width direction), and the up-down direction are defined based on the occupant seated in the driver's seat.
  • a bumper beam 11 made of fiber reinforced resin is disposed in the vehicle width direction at the front of the vehicle body of an automobile, and both ends of the bumper beam 11 in the vehicle width direction are made of fiber reinforced resin.
  • the rear ends of the bumper beam extensions 12, 12 are supported by the front ends of the left and right metal front side frames 13, 13.
  • the bumper beam 11 is a member having a W-shaped cross section in which an upper beam portion 14U and a lower beam portion 14L of a U-shaped cross section which are opened forward are coupled to the upper and lower sides.
  • the upper beam portion 14U and the lower beam portion 14L are Bottom wall 14a located at the rear end, upper wall 14b extending forward from the upper end of bottom wall 14a, lower wall 14c extending forward from the lower end of bottom wall 14a, and upper end from the front end of upper wall 14b of upper beam portion 14U
  • the upper flange 14d extending vertically
  • the lower flange 14e extending downward from the front end of the lower wall 14c of the lower beam portion 14L
  • the lower wall 14c of the upper beam portion 14U and the upper wall 14b of the lower beam portion 14L in the vertical direction
  • a flange 14f is a member having a W-shaped cross section in which an upper beam portion 14U and a lower beam portion 14L of a U-shaped cross section which are opened forward are
  • Bumper beam 11 is a pair of left and right curves which curve in the front in the vehicle width direction on both sides in the vehicle width direction of center curved portion A that curves in a concave shape toward the front in a predetermined range in the center in the vehicle width direction.
  • Parts B and B are formed, and the left and right bent parts B are located at the outer side in the vehicle width direction and connected to the bumper beam extension 12 and the bumper beam extension connection part B1; And a load input portion B2 that protrudes most forwardly.
  • middle portions in the vehicle width direction of upper beam portion 14U and lower beam portion 14L of bumper beam extension connection portion B1 extend vertically and longitudinally so as to connect upper wall 14b, bottom wall 14a and lower wall 14c, respectively.
  • Vertical rib 14j, 14j are provided, and the upper end of the upper beam portion 14U and the lower end of the lower beam portion 14L in the vehicle width direction are connected vertically to the upper wall 14b, the bottom wall 14a and the lower wall 14c respectively. It has one end wall 14k extending in the direction.
  • Upper flanges 14d and 14d and lower flanges 14e and 14e are not formed between the longitudinal ribs 14j on the inner side in the vehicle width direction of the bumper beam 11 and the end walls 14k (see FIG. 1).
  • a metal cover member 31 is attached to a central portion of the bumper beam 11 in the vehicle width direction.
  • the cover member 31 includes a rectangular main body portion 31 a and locking portions 31 b and 31 c obtained by bending the upper and lower ends of the main body portion 31 a backward, and the upper and lower portions of the main body portion 31 a are upper flanges 14 d of the bumper beam 11. And fixed to the lower flange 14e by rivets 32.
  • the locking portion 31b at the upper end of the main body portion 31a engages with the upper flange 14d of the bumper beam 11 from above
  • the locking portion 31c at the lower end of the main body portion 31a engages with the lower flange 14e of the bumper beam 11 from below Match.
  • the bumper beam 11 is configured by laminating a continuous fiber reinforced resin sheet 15 located on the rear side and a discontinuous fiber reinforced resin sheet 16 located on the front side in two layers.
  • the continuous fiber reinforced resin sheet 15 is formed by solidifying a woven fabric composed of continuous glass fibers oriented in the vehicle width direction and continuous glass fibers oriented in the vertical direction or the front-back direction orthogonal thereto with a nylon resin.
  • the fiber-reinforced resin sheet 16 is formed by fixing glass discontinuous fibers which are randomly oriented and entangled with each other with a nylon resin.
  • the mold 21 for press molding the bumper beam 11 is a negative mold 22 having concave cavities 22 a and 22 a for molding the rear surface of the continuous fiber reinforced resin sheet 15, and a discontinuous fiber reinforced resin sheet 16.
  • a negative mold 22 having concave cavities 22 a and 22 a for molding the rear surface of the continuous fiber reinforced resin sheet 15, and a discontinuous fiber reinforced resin sheet 16.
  • convex cores 23a and 23a for forming the front face of the head
  • the longitudinal ribs 14j and grooves 23b for forming the end walls 14k are formed in the cores 23a and 23a.
  • the continuous fiber prepreg 15 'and the discontinuous fiber prepreg 16' are arranged between the cavities 22a, 22a of the female mold 22 and the cores 23a, 23a of the male mold 23 in a preheated state Be done.
  • the second continuous fiber prepregs 17 ′ and 17 ′ formed in a narrow band shape at portions corresponding to the bottom walls 14 a and 14 a of the bumper beam 11 are a continuous fiber prepreg 15 ′ and a discontinuous fiber prepreg 16. Placed so as to be sandwiched between.
  • the prepreg is a woven fabric such as plain weave or twill weave made of continuous fibers such as carbon fibers, glass fibers and aramid fibers, UD (sheet in which continuous fibers are aligned in one direction), or a mat of discontinuous fibers as a reinforcing material, It is impregnated with a semi-hardened thermosetting resin (such as epoxy resin and polyester resin) or a thermoplastic resin (such as nylon 6 or polypropylene), and has flexibility adapted to the shape of the mold. In the case of a thermosetting resin, when it is heated to, for example, about 130 ° C.
  • thermosetting resin is cured to obtain a fiber reinforced resin product .
  • a plurality of preheated prepregs are inserted in a laminated state in a mold, pressure-molded, and then cooled to obtain a fiber reinforced resin product.
  • the reinforcing material of the continuous fiber prepreg 15 'and the second continuous fiber prepregs 17' and 17 ' is a woven fabric in which continuous glass fibers are oriented in the direction orthogonal to each other, and the discontinuous fiber prepreg 16
  • the 'reinforcement' is a non-woven fabric of glass discontinuous fibers consisting of long fibers having a randomly oriented fiber length of about 5 mm.
  • the continuous fiber prepreg 15' and the second continuous fiber prepregs 17 ', 17' and the core 23a, 23a of the male die 23 The continuous fiber prepreg 16 'is laminated in a thin film along the front surface of the continuous fiber prepreg 15' and the second continuous fiber prepregs 17 'and 17' and flows into the grooves 23b of the cores 23a and 23a. And the end walls 14k at the same time. Then, the excess portion protruding to the outer periphery of the bumper beam 11 taken out of the mold 21 is cut to complete the bumper beam 11.
  • FIG. 4A shows the plate thickness of the cross section of the bumper beam 11 which is formed as described above.
  • the bottom wall 14a of the bumper beam 11 is formed by the continuous fiber reinforced resin sheet 15 composed of the continuous fiber prepreg 15 'and the second continuous fiber reinforced resin sheet 17 composed of the second continuous fiber prepreg 17'. Because of the layered structure, the thickness T1 of the bottom wall 14a is larger than the thickness T2 of the upper wall 14b and the lower wall 14c over the entire area of the bumper beam 11 in the vehicle width direction.
  • the thickness T2 of the bottom wall 14a changes in the vehicle width direction of the bumper beam 11. That is, the thickness T1 between the front ends of the left and right load input portions B2 and B2 is a constant maximum value, and the thickness gradually decreases toward the outer side in the vehicle width direction, thereby minimizing the deformation center of the bumper beam extension connection portion B1. It becomes a value and gradually increases from there to the outside in the vehicle width direction.
  • the bumper beam extension 12 is a side flange formed with an upper member 33U and a lower member 33L having symmetrical upper and lower shapes on their outer ends in the vehicle width direction.
  • 33a, 33a and side flanges 33b, 33b formed at the inner end in the vehicle width direction are superposed and integrally joined by rivets 34, and configured in a box-like closed cross-section penetrating in the front-rear direction.
  • front flanges 33c, 33c extend from the front end of the upper member 33U and the lower member 33L to the front upper and front lower, respectively, and the front flange 33c of the upper member 33U is riveted to the upper wall 14b of the bumper beam extension 12 ...
  • the front flange 33c of the lower member 33L is connected to the lower wall 14c of the bumper beam extension 12 by rivets 35.
  • the upper member 33U and the lower member 33L of the bumper beam extension 12 have front walls 33d, 33d connected to the front ends of the side flanges 33a, 33a on the outer side in the vehicle width direction and the outer ends in the vehicle width direction of the front flanges 33c, 33c.
  • the side flanges 33a and 33a, the front flanges 33c and 33c, and the front walls 33d and 33d cover the outer end of the bumper beam extension connection B1 of the bumper beam 11 in the vehicle width direction.
  • the bumper beam 11 of the present embodiment is provided with the central curved portion A which is concavely curved forward.
  • the tips of the pair of load input portions B2 and B2 on both sides in the vehicle width direction of the central curved portion A collide with bumper beams of other vehicles, and the collision load F concentrates at two points of the tips of the pair load input portions B2 and B2. Input.
  • the maximum value of the bending moment acting on the bumper beam 11 is reduced, but also in a region sandwiched by the tips of the pair of load input portions B2 and B2 including the central curved portion A (input point of load F).
  • a tensile load is applied, a compressive load is applied to the bumper beam extension connections B1 and B1, and only a narrow region sandwiched between the bumper beam extension connections B1 and B1 and the tips of the load input parts B2 and B2 is twisted.
  • (shearing) deformation the opening of the bumper beam 11 due to torsional deformation is suppressed, and the breaking strength is enhanced.
  • the bumper beam 11 between the left and right bending centers is deformed so as to curve backward (see the chain line in FIG. 2).
  • the load acts on the front side of the bumper beam 11 (see FIG. 3).
  • the rear surface side of the bumper beam 11 to which the tensile load acts is formed of the continuous fiber reinforced resin sheet 15 which is resistant to the tensile load, and the continuous fiber reinforced resin sheet 15 is oriented in the direction orthogonal to each other.
  • the continuous fibers oriented in the vehicle width direction in particular resist the tensile load, thereby increasing the strength against bending deformation while improving the weight reduction of the bumper beam 11, thereby improving the collision energy absorption performance. be able to.
  • the front side of the bumper beam 11 to which the compressive load acts is composed of the discontinuous fiber reinforced resin sheet 16 which is resistant to the compressive load, and the randomly oriented and entangled discontinuous fibers are compressed.
  • the bending moment acting between the tips of the left and right load input parts B2 and B2 is a constant maximum.
  • the plate thickness T1 (see FIG. 4A) of the bottom wall 14a of the bumper beam 11 is set in accordance with the magnitude of the bending moment acting thereon, and the plate thickness T1 becomes large in the portion where the bending moment is large.
  • the plate thickness T1 decreases at portions where the bending moment is small.
  • the bottom wall 14a is located at the rear end of the bumper beam 11, it greatly contributes to the increase of the cross section coefficient related to the bending deformation in the back and forth direction of the bumper beam 11, thereby increasing the thickness T1 of the bottom wall 14a.
  • the cross section coefficient can be effectively increased by minimizing the increase of.
  • the thickness T1 of the bottom wall 14a is larger than the thickness T2 of the upper wall 14b and the lower wall 14c. Therefore, the amount of continuous fibers in the bottom wall 14a can be increased to increase the strength against tensile load.
  • the bumper beam 11 is provided with a cover member 31 at the center in the vehicle width direction, and the cover member 31 vertically connects between the top wall 14b and the bottom wall 14c at the lowest position, so that a collision load in the front and rear direction is input.
  • the bumper beam 11 can be prevented from opening deformation, the cross-sectional shape can be maintained, and the strength against bending stress and shearing stress can be enhanced.
  • the bumper beam 11 since the bumper beam 11 includes the longitudinal ribs 14 j and the end walls 14 k which are formed by compression molding the discontinuous fiber reinforced resin sheet 16, the bumper beam 11 is subjected to opening deformation when a collision load is input. It can be prevented to maintain the cross sectional shape, and the strength against bending stress and shearing stress can be enhanced.
  • the vehicle width direction outer end of the bumper beam extension connection portion B1 is covered by the side flanges 33a and 33a, the front flanges 33c and 33c and the front walls 33d and 33d of the upper member 33U and the lower member 33L of the bumper beam extension 12 Therefore, when the collision load in the front-rear direction is input, the vehicle width direction outer end of the bumper beam 11 is prevented from opening deformation, and the collision load is reliably transmitted from the bumper beam 11 to the bumper beam extension 12 to improve efficiency. Can be absorbed.
  • the continuous fiber reinforced resin sheet 15 is formed on the bottom wall 14a as a means to make the thickness T1 of the bottom wall 14a of the bumper beam 11 larger than the thickness T2 of the upper wall 14b and the lower wall 14c.
  • the second continuous fiber reinforced resin sheet 17 is laminated, in the second embodiment, the second continuous fiber reinforced resin sheet 17 is eliminated, and instead a discontinuous fiber reinforced resin sheet in the bottom wall 14a The thickness of 16 is increased. Since the discontinuous fiber reinforced resin sheet 16 can be deformed into an arbitrary shape in the mold 21 at the time of pressure forming of the bumper beam 11, it is easy to change its thickness.
  • the thickness T1 of the bottom wall 14a can be increased. Since the thickness T2 of the upper wall 14b and the lower wall 14c is larger than the thickness T2, the amount of discontinuous fibers in the bottom wall 14a can be increased to enhance the strength against compressive load.
  • FIGS. 9 to 17 The members corresponding to the above-mentioned embodiment are indicated using the same reference numerals, and the detailed description is omitted, and the description of the similarly obtained actions is also omitted.
  • the bumper beam 11 is a member having a W-shaped cross section in which an upper beam portion 14U and a lower beam portion 14L of a U-shaped cross section which are opened forward are coupled to the upper and lower sides.
  • the upper beam portion 14U and the lower beam portion 14L are Bottom wall 14a located at the rear end, upper wall 14b extending forward from the upper end of bottom wall 14a, lower wall 14c extending forward from the lower end of bottom wall 14a, and upper end from the front end of upper wall 14b of upper beam portion 14U
  • the upper flange 14d extending vertically, the lower flange 14e extending downward from the front end of the lower wall 14c of the lower beam portion 14L, and the lower wall 14c of the upper beam portion 14U and the upper wall 14b of the lower beam portion 14L in the vertical direction
  • a flange 14f an upper folded portion 14g obtained by folding the upper end of the upper flange 14d rearward, and a lower folded portion obtained by folding the lower end of the lower flange 14e
  • middle portions in the vehicle width direction of upper beam portion 14U and lower beam portion 14L of bumper beam extension connection portion B1 extend vertically and longitudinally so as to connect upper wall 14b, bottom wall 14a and lower wall 14c, respectively.
  • Vertical rib 14j, 14j are provided, and the upper end of the upper beam portion 14U and the lower end of the lower beam portion 14L in the vehicle width direction are connected vertically to the upper wall 14b, the bottom wall 14a and the lower wall 14c respectively. It has one end wall 14k extending in the direction.
  • Upper flanges 14d and 14d, lower flanges 14e and 14e, upper folds 14g and lower folds 14h are formed between the longitudinal ribs 14j on the inner side in the vehicle width direction of the bumper beam 11 and the end walls 14k. Not (see Figure 9).
  • a metal tension member 131 is attached to a central portion of the bumper beam 11 in the vehicle width direction.
  • the tension member 131 includes a rectangular main body portion 31a ', and locking portions 31b' and 31c 'obtained by bending the upper and lower ends of the main body portion 31a' backward, and the engagement portion 31b 'at the upper end and the engagement at the lower end Stops 31c 'are fixed to upper folded portion 14g of upper flange 14d of bumper beam 11 and lower folded portion 14h of lower flange 14e by clips 32' and 32 ', respectively.
  • the locking portion 31b 'at the upper end of the tension member 131 engages with the upper folded portion 14g of the bumper beam 11 from above, and the locking portion 31c' at the lower end of the tension member 131 is the lower folded portion 14h of the bumper beam 11 Engage from below.
  • the reinforcing material of the continuous fiber prepreg 15 ' is a woven fabric in which continuous glass fibers are oriented in directions orthogonal to each other, and the reinforcing material of the discontinuous fiber prepreg 16' has a randomly oriented fiber length. It is a non-woven fabric of glass discontinuous fibers consisting of long fibers of about 30 mm (see FIG. 16).
  • the continuous fiber prepreg 15 ' is pressed by the cavities 22a, 22a of the female mold 22 and the cores 23a, 23a of the male mold 23, and a bumper beam having a W-shaped cross section The back of 11 is molded.
  • the discontinuous fiber prepreg 16 ' can be easily deformed, the discontinuous fiber prepreg 16' sandwiched by the continuous fiber prepreg 15 'and the cores 23a and 23a of the male die 23 is the continuous fiber prepreg 15'.
  • the bumper beam 11 having a complicated cross-sectional shape can be easily formed by the discontinuous fiber-reinforced resin sheet 16 having high formability.
  • the longitudinal direction of the discontinuous fibers contained in the discontinuous fiber prepregs 16' flows
  • the strength of the longitudinal ribs 14 j can be effectively enhanced by aligning them along the direction of (see the dashed line frame in FIG. 14).
  • the bumper beam extension 12 includes an upper member 33U and a lower member 33L having a vertically symmetrical shape, and the U-shaped cross section of the upper member 33U and the lower member 33L
  • the body portions 33a 'and 33a' are riveted together by side flanges 33b 'and 33b' formed at their outer ends in the vehicle width direction and side flanges 33c 'and 33c' formed at their inner ends in the vehicle width direction.
  • integrally connecting at 34 ... it is configured as a box-like closed cross-section penetrating in the front-rear direction.
  • triangular extending portions 33d 'and 33d' extend from the front end of the side flanges 33c 'and 33c' on the inner side in the vehicle width direction toward the inner side in the vehicle width direction, and extend from the front ends of the main body portions 33a 'and 33a' Bumper beam attachment portions 33e and 33e are formed to straddle the front ends of the portions 33d 'and 33d'.
  • the bumper beam attaching portion 33e of the upper member 33U extends upward from the main body portion 33a 'and then extends forward, and a portion extending forward is superposed on the upper surface of the upper wall 14b of the upper beam portion 14U of the bumper beam 11 It is fixed by the rivet 35 ... of.
  • the bumper beam attachment portion 33e of the lower member 33L extends downward from the main body portion 33a 'and then extends forward, and a portion extending forward is superimposed on the lower surface of the lower wall 14c of the lower beam portion 14L of the bumper beam 11 , Fixed by four rivets 35. Further, locking walls 33g, 33g that cover the vehicle width direction outer end of the bumper beam 11 from the front are formed at the vehicle width direction outer ends of the bumper beam attachment portions 33e, 33e connected to the front side of the main body 33a '.
  • the bumper beam 11 of the present embodiment is the same as the embodiment described above.
  • the opening due to torsional deformation is suppressed and the breaking strength is enhanced.
  • the bumper beam extension 12 is extended inward in the vehicle width direction with respect to the deformation center of the bumper beam 11 and includes the extension portions 33d 'and 33d' connected to the bumper beam extension connection portion B1
  • the collision load of the frontal collision The position of the center of deformation of the bumper beam 11 is moved inward in the vehicle width direction when the character is input, and the maximum value of the bending moment acting on the bumper beam 11 is reduced to reduce the bumper beam 11 while reducing the weight locally Can be prevented.
  • the extensions 33d 'and 33d' of the bumper beam extension 12 overlap the upper folds 14g and the lower folds 14h of the bumper beam 11, so the collision load is from the bumper beam 11 to the bumper beam extensions
  • the energy can be efficiently transmitted to the twelve extensions 33d 'and 33d', and the extensions 33d 'and 33d' can be buckled to absorb collision energy.
  • the bumper beam 11 includes the tension member 131 at the center in the vehicle width direction, and the tension member 131 vertically connects between the upper folded portion 14g and the lower folded portion 14h.
  • the bumper beam 11 can be more reliably prevented from opening deformation, the cross-sectional shape can be maintained, and the strength against bending stress and shearing stress can be enhanced.
  • three upper and lower rivets 35 are main body portions 33a ' , 33a 'in front of.
  • the rivet 35 fastening point on the inner side in the vehicle width direction located closest to the inner side in the vehicle width direction is the center of deformation, and the rivet 35 (vehicle width on the outermost side in the vehicle width direction).
  • the locking wall 33g is formed in the vicinity of the fastening point (outside fastening point).
  • the outer end of the bumper beam 11 in the vehicle width direction is fixed to the bumper beam extension 12 by the rivet 35 and is locked to the front end of the bumper beam extension 12 by the locking wall 33g.
  • the vehicle width direction outer end of the bumper beam 11 which is about to move forward with the deformation center as the fulcrum at the time of input receives the rearward load f from the bumper beam extension 12.
  • a bending moment in the reverse direction acts on the bumper beam 11, thereby acting on the load input point.
  • the bending moment decreases its maximum value, which can prevent local destruction of the bumper beam 11 at the load input point.
  • the bumper beam extension 12 absorbs collision energy by collapsing under compression load from the bumper beam 11, the bumper beam extension 12 tries to move forward with the deformation center as a fulcrum when the collision load is input.
  • a forward load f ' is applied to the vehicle width direction outer end of the bumper beam extension 12 by being pulled to the vehicle width direction outer end (see FIG. 17B). Since this load f 'acts in the direction to suppress the crushing of the bumper beam extension 12, if the size thereof is excessive, the stable crushing of the bumper beam extension 12 may be inhibited and the energy absorbing performance may be reduced.
  • the upper folded portion 14g and the lower folded portion 14h are not formed on the outer side in the vehicle width direction than the rivet 35 which is the fastening point on the inner side of the bumper beam 11 in the vehicle width direction.
  • the bumper beam extension 12 by reducing the strength of the bumper beam 11 on the outer side in the vehicle width direction of the center and preventing the forward load f 'from becoming excessive at the outer end of the bumper beam extension 12 in the vehicle width direction. It can make stable crushing possible.
  • Bumper beam extension connecting portion B1 of bumper beam 11 is provided with longitudinal ribs 14j, 14j extending in the front and rear direction and in the vertical direction, and the outer ends of upper folded portion 14g and lower folded portion 14h are the positions of longitudinal ribs 14j, 14j
  • the opening deformation of the bumper beam 11 is further made by the vertical ribs 14j and 14j as well as the upper folded portion 14g and the lower folded portion 14h. This can be reliably prevented, and the collision load can be more reliably transmitted from the bumper beam 11 to the bumper beam extension 12 to enhance the absorption effect of collision energy.
  • the tension member 131 of the third embodiment is made of metal, but the tension member 131 'of this embodiment is made of fiber reinforced resin, and is located behind the continuous fiber reinforced resin sheet 17a located on the front side. It is constructed by laminating the discontinuous fiber reinforced resin sheet 18.
  • the inner surfaces of the upper and lower locking portions 31b 'and 31c' formed of the discontinuous fiber reinforced resin sheet 18 of the tension member 131 ' are an upper flange 14d and a lower flange 14e formed of the discontinuous fiber reinforced resin sheet 16 of the bumper beam 11. It is fixed to the upper folded portion 14g and the lower folded portion 14h by vibration welding.
  • the present invention can also be applied to a bumper beam on the rear side.
  • the outer side in the front-rear direction corresponds to the front
  • the outer side in the front-rear direction corresponds to the rear.
  • the bumper beam 11 of the embodiment has a W-shaped cross section opened outward in the front-rear direction
  • the bumper beam 19 of the present invention has a U-shaped (or U-shaped) cross section opened outward in the front-rear direction May be included.
  • the bumper beam extension 12 is an impact absorbing member such as a front end that is crushed by a front collision of a front side frame and absorbs impact, and a rear end that is crushed by a rear collision of a rear side frame and is absorbed by shock good.

Abstract

Provided is an automobile bumper in which a bumper beam (11) having a W-shaped cross-section open at the front is configured by laminating: a non-continuous-fiber-reinforced resin sheet (16) located on the front side and containing non-continuous fibers; and a continuous-fiber-reinforced resin sheet (15) located on the rear side and containing continuous fibers. The bumper beam (11) is provided with bottom walls (14a) located on the rear side and also with sidewalls (14b, 14c) extending forward from both the upper and lower ends of each of the bottom walls (14a). The plate thickness (T1) of the bottom walls (14a) is greater than the plate thickness (T2) of the sidewalls (14b, 14c), and consequently, the rigidity of the bumper beam (11) against bending deformation in the front-rear direction can be efficiently increased while an increase in weight is kept to a minimum, thereby increasing the collision energy absorption performance.

Description

自動車用バンパーCar bumper
　本発明は、Ｗ字状断面あるいはＵ字状断面を有するバンパービームを、不連続繊維を含む不連続繊維強化樹脂シートと、連続繊維を含む連続繊維強化樹脂シートとを積層して構成した自動車用バンパーに関する。 The present invention is directed to an automobile, in which a bumper beam having a W-shaped cross section or a U-shaped cross section is formed by laminating a discontinuous fiber reinforced resin sheet containing discontinuous fibers and a continuous fiber reinforced resin sheet containing continuous fibers. About the bumper.
　前方あるいは後方に向けて開放するＵ字状断面あるいはＷ字状断面を有する繊維強化樹脂製のバンパービームにおいて、前後方向の衝突荷重が入力したときにバンパービームが口開き変形するのを防止することで、バンパービームの強度を高めて衝突エネルギーの吸収性能の向上を図るものが種々提案されている。 In a bumper beam made of fiber reinforced resin having a U-shaped cross section or a W-shaped cross section which opens forward or backward, the bumper beam is prevented from opening deformation when a collision load in the front-rear direction is input. Therefore, various proposals have been made to increase the strength of the bumper beam to improve the collision energy absorption performance.
　例えば、下記特許文献１には、前方に向けて開放するＷ字状断面のバンパービームの内部に縦方向および横方向にリブを形成するとともに、バンパーフェイスの内面をバンパービームの前端に溶融樹脂で結合したものが提案されている。 For example, in Patent Document 1 below, ribs are formed longitudinally and laterally inside a bumper beam having a W-shaped cross section opened forward, and the inner surface of the bumper face is made of molten resin at the front end of the bumper beam. A combination is proposed.
　また下記特許文献２には、熱可塑性樹脂と連続繊維を含む樹脂シートとを重ねてプレス成形することで後方に向けて開放するＷ字状断面のバンパービームを構成し、Ｗ字状断面の上下の端部に熱可塑性樹脂あるいは連続繊維を含む樹脂シートを追加して局部的に板厚を増加させたものが提案されている。 Further, in Patent Document 2 below, a bumper beam having a W-shaped cross section which is opened rearward by forming a thermoplastic resin and a resin sheet containing continuous fibers in an overlapping manner is formed, and the upper and lower sides of the W-shaped cross section It has been proposed to increase the thickness locally by adding a resin sheet containing thermoplastic resin or continuous fibers at the end of the sheet.
　また下記特許文献３には、前方に向けて開放するＵ字状断面のバンパービームの内部に縦補強リブおよび斜め補強リブを形成したものが提案されている。 Further, Patent Document 3 below proposes that a longitudinal reinforcing rib and an oblique reinforcing rib are formed inside a bumper beam having a U-shaped cross section opened forward.
　また下記特許文献４には、連続繊維を含む樹脂シートと不連続繊維を含む樹脂シートとを重ね合わせてプレス成形することで前方に向けて開放するＵ字状断面のバンパービームを構成し、その内部に不連続繊維を含む樹脂シートよりなる縦リブおよび横リブを形成したものが提案されている。 Further, in Patent Document 4 below, a bumper beam having a U-shaped cross section which is opened forward is configured by overlapping a resin sheet containing continuous fibers and a resin sheet containing discontinuous fibers, and press-forming the same. It has been proposed to form longitudinal ribs and transverse ribs made of a resin sheet containing discontinuous fibers inside.
　また下記特許文献５には、前方に向けて開放するＵ字状断面のバンパービームの内部に縦方向に延びる多数のリブを形成するとともに、その後端の縦壁部に車幅方向に延びる多数ビ－ドを形成したものが提案されている。 Further, in Patent Document 5 below, while forming a plurality of longitudinally extending ribs inside a bumper beam having a U-shaped cross section opened forward, a large number of beams extending in the vehicle width direction are formed in a longitudinal wall portion at the rear end. It has been proposed that the formation of
日本特開平３－２２４８５０号公報Japanese Patent Laid-Open No. 3-224850 日本特表２０００－５１５８２８号公報Japanese Patent Publication No. 2000-515828 日本特許第３２２９５６８号公報Japanese Patent No. 3229568 国際公開第ＷＯ２０１３０９４５１５号公報International Publication No. WO201309515 日本特開平３－２２７７５０号公報Japanese Patent Laid-Open No. 3-227750
　しかしながら、上記各特許文献に記載されたものは、バンパービームの内部に多数のリブを形成することで強度を高めるものであり、バンパービームの曲げ強度を左右する各部の板厚分布を考慮していないため、重量が増加する割には充分な強度向上が得られないという問題があった。 However, what is described in each of the above patent documents is to increase the strength by forming a large number of ribs inside the bumper beam, and taking into consideration the thickness distribution of each part that influences the bending strength of the bumper beam. However, there is a problem that sufficient improvement in strength can not be obtained in spite of the increase in weight.
　上記特許文献１、４及び５に記載されたものは、衝突荷重の入力時にバンパービームが口開き変形するのを防止するためには縦方向のリブを車幅方向に短い間隔で多数形成する必要があり、繊維強化樹脂が連続繊維層を有する場合には成形が困難であるばかりか、重量が増加してバンパービームを繊維強化樹脂製としたメリットを活かすことができないという問題があった。 In the above-mentioned Patent Documents 1, 4 and 5, it is necessary to form a large number of longitudinal ribs at short intervals in the vehicle width direction in order to prevent the bumper beam from being deformed by opening at the time of collision load input. Not only is the molding difficult when the fiber reinforced resin has a continuous fiber layer, but there is also the problem that the weight is increased and the merit of using a bumper beam made of a fiber reinforced resin can not be utilized.
　また上記特許文献２に記載されたものは、Ｗ字状断面を有するバンパービームの底壁が前方を向いているため、衝突荷重の入力によりバンパービームが後方に湾曲したとき、バンパービームの後面に作用する引張荷重を車幅方向に延びる底壁の連続繊維層で支持することができず、曲げ荷重に対するバンパービームの強度が著しく低下するという問題があった。 In addition, since the bottom wall of the bumper beam having a W-shaped cross section faces forward, the one described in Patent Document 2 above is directed to the rear surface of the bumper beam when the bumper beam is curved backward by the input of a collision load. There is a problem that the applied tensile load can not be supported by the continuous fiber layer of the bottom wall extending in the vehicle width direction, and the strength of the bumper beam to bending load is significantly reduced.
　本発明は前述の事情に鑑みてなされたもので、重量の増加を最小限に抑えながらバンパービームの口開き変形を防止して曲げ強度を高めることを目的とする。 The present invention has been made in view of the above-described circumstances, and it is an object of the present invention to increase bending strength by preventing the opening deformation of a bumper beam while minimizing the increase in weight.
　上記目的を達成するために、本発明によれば、Ｗ字状断面あるいはＵ字状断面を有するバンパービームを、不連続繊維を含む不連続繊維強化樹脂シートと、連続繊維を含む連続繊維強化樹脂シートとを積層して構成した自動車用バンパーであって、前記バンパービームは、垂直に位置する底壁と、前記底壁の上下両端から水平方向に延びる側壁とを備え、前記底壁の板厚は前記側壁の板厚よりも大きいことを第１の特徴とする自動車用バンパーが提案される。 In order to achieve the above object, according to the present invention, a bumper beam having a W-shaped cross section or a U-shaped cross section, a discontinuous fiber reinforced resin sheet containing discontinuous fibers, and a continuous fiber reinforced resin containing continuous fibers An automotive bumper comprising a stack of sheets, wherein the bumper beam comprises a vertically positioned bottom wall and side walls extending horizontally from upper and lower ends of the bottom wall, and the thickness of the bottom wall A bumper for an automobile according to a first feature of the present invention is proposed to be larger than the thickness of the side wall.
　また本発明によれば、前記第１の特徴に加えて、前記底壁の連続繊維強化樹脂シートに第２の連続繊維強化樹脂シートを積層することで、前記底壁の板厚を前記側壁の板厚よりも大きくしたことを第２の特徴とする自動車用バンパーが提案される。 Further, according to the present invention, in addition to the first feature, by laminating a second continuous fiber reinforced resin sheet on the continuous fiber reinforced resin sheet of the bottom wall, the thickness of the bottom wall can be made of the side wall. An automotive bumper is proposed, which is characterized in that it has a second feature greater than its thickness.
　また本発明によれば、前記第１の特徴に加えて、前記底壁の不連続繊維強化樹脂シートを前記側壁の不連続繊維強化樹脂シートよりも厚くすることで、前記底壁の板厚を前記側壁の板厚よりも大きくしたことを第３の特徴とする自動車用バンパーが提案される。 Further, according to the present invention, in addition to the first feature, by making the discontinuous fiber reinforced resin sheet of the bottom wall thicker than the discontinuous fiber reinforced resin sheet of the side wall, the thickness of the bottom wall is made According to a third aspect of the present invention, there is proposed an automobile bumper having a thickness greater than the thickness of the side wall.
　また本発明によれば、前記第１～第３の何れか１つの特徴に加えて、衝突荷重により前記バンパービームに作用する曲げモーメントの分布に応じて前記底壁の板厚を車幅方向に変化させたことを第４の特徴とする自動車用バンパーが提案される。 According to the present invention, in addition to any one of the first to third features, the thickness of the bottom wall in the vehicle width direction according to the distribution of the bending moment acting on the bumper beam by the collision load An automotive bumper is proposed, the fourth characteristic of which is changed.
　また本発明によれば、前記第１の特徴に加えて、前記バンパービームは、車幅方向中央部において前後方向外側に向けて凹状に湾曲する中央湾曲部と、前記中央湾曲部の車幅方向両側において前後方向外側に向けて凸状に湾曲する一対の左右湾曲部とからなり、前記左右湾曲部は、車幅方向外側に位置して前記バンパービームエクステンションに接続されるバンパービームエクステンション接続部と、車幅方向内側に位置して前記バンパービームのうちで前後方向外側に最も突出する荷重入力部とを備えることを第５の特徴とする自動車用バンパーが提案される。 Further, according to the present invention, in addition to the first feature, the bumper beam has a central curved portion concavely curved outward in the longitudinal direction at a central portion in the vehicle width direction, and a vehicle width direction of the central curved portion. The bumper beam extension connecting portion includes a pair of left and right curved portions convexly curved toward the front and rear direction outside on both sides, and the left and right curved portions are connected to the bumper beam extension located on the outer side in the vehicle width direction According to a fifth aspect of the present invention, there is provided a bumper for an automobile according to a fifth aspect of the present invention, comprising a load input portion which is located inward in the vehicle width direction and which protrudes most outward in the front-rear direction.
　また本発明によれば、前記第５の特徴に加えて、前記バンパービームは上部フランジを前後方向内側に折り返した上部折り返し部と下部フランジを前後方向内側に折り返した下部折り返し部とを備え、前記バンパービームエクステンション接続部は少なくとも車幅方向内側の締結点および車幅方向外側の締結点で前記バンパービームエクステンションの本体部に締結され、前記上部折り返し部および前記下部折り返し部の車幅方向外端は前記車幅方向内側の締結点の近傍を終端とすることを第６の特徴とする自動車用バンパーが提案される。 Further, according to the present invention, in addition to the fifth feature, the bumper beam includes an upper folded portion formed by folding the upper flange inward in the front-rear direction and a lower folded portion formed by folding the lower flange in the front-rear direction. The bumper beam extension connection portion is fastened to the main body of the bumper beam extension at least at the fastening point on the inner side in the vehicle width direction and the fastening point on the outer side in the vehicle width direction, and the vehicle width direction outer end of the upper folded portion and the lower folded portion is According to a sixth aspect of the present invention, there is provided a bumper for a motor vehicle, which ends in the vicinity of the fastening point on the inner side in the vehicle width direction.
　尚、実施の形態のバンパービームエクステンション１２は本発明の衝撃吸収部材に対応し、実施の形態の上壁１４ｂおよび下壁１４ｃは本発明の側壁に対応し、実施の形態のリベット３５は本発明の締結点に対応し、実施の形態のバンパービームエクステンション接続部Ｂ１は本発明の衝撃吸収部材接続部に対応する。 The bumper beam extension 12 of the embodiment corresponds to the shock absorbing member of the present invention, the upper wall 14b and the lower wall 14c of the embodiment correspond to the side wall of the present invention, and the rivet 35 of the embodiment is the present invention. The bumper beam extension connection portion B1 of the embodiment corresponds to the shock absorbing member connection portion of the present invention.
　本発明の第１の特徴によれば、自動車用バンパーは、Ｗ字状断面あるいはＵ字状断面を有するバンパービームが、不連続繊維を含む不連続繊維強化樹脂シートと、連続繊維強化樹脂シートとを積層して構成される。 According to a first aspect of the present invention, a bumper for an automobile comprises a bumper beam having a W-shaped cross section or a U-shaped cross section, a discontinuous fiber reinforced resin sheet containing discontinuous fibers, a continuous fiber reinforced resin sheet, It is configured by laminating
　バンパービームは、垂直に位置する底壁と、底壁の上下両端から水平方向に延びる側壁とを備え、底壁の板厚は側壁の板厚よりも大きいので、重量の増加を最小限に抑えながら水平方向の曲げ変形に対するバンパービームの剛性を効率良く高め、衝突エネルギーの吸収性能の向上を図ることができる。 The bumper beam has a vertically positioned bottom wall and side walls extending horizontally from the upper and lower ends of the bottom wall, and the thickness of the bottom wall is larger than the thickness of the side wall, thereby minimizing the increase in weight However, the rigidity of the bumper beam against bending deformation in the horizontal direction can be efficiently enhanced, and the impact energy absorbing performance can be improved.
　また本発明の第２の特徴によれば、底壁の連続繊維強化樹脂シートに第２の連続繊維強化樹脂シートを積層することで、底壁の板厚を側壁の板厚よりも大きくしたので、連続繊維の量を増加させて引張荷重に対する強度を高めることができる。 Further, according to the second feature of the present invention, by laminating the second continuous fiber reinforced resin sheet on the continuous fiber reinforced resin sheet of the bottom wall, the thickness of the bottom wall is made larger than the thickness of the side wall. The amount of continuous fibers can be increased to increase the strength against tensile loading.
　また本発明の第３の特徴によれば、底壁の不連続繊維強化樹脂シートを側壁の不連続繊維強化樹脂シートよりも厚くすることで、底壁の板厚を側壁の板厚よりも大きくしたので、不連続繊維の量を増加させて圧縮荷重に対する強度を高めることができる。 According to the third feature of the present invention, by making the discontinuous fiber reinforced resin sheet on the bottom wall thicker than the discontinuous fiber reinforced resin sheet on the side wall, the thickness of the bottom wall is larger than the thickness of the side wall Therefore, the amount of discontinuous fibers can be increased to increase the strength against compressive load.
　また本発明の第４の特徴によれば、衝突荷重によりバンパービームに作用する曲げモーメントの分布に応じて底壁の板厚を車幅方向に変化させたので、バンパービームの車幅方向の強度分布を最適化して軽量化を図ることができる。 Further, according to the fourth feature of the present invention, the thickness of the bottom wall is changed in the vehicle width direction according to the distribution of bending moment acting on the bumper beam due to the collision load, so the strength of the bumper beam in the vehicle width direction The distribution can be optimized to reduce the weight.
　また本発明の第５の特徴によれば、バンパービームは、車幅方向中央部において前後方向外側に向けて凹状に湾曲する中央湾曲部と、中央湾曲部の車幅方向両側において前後方向外側に向けて凸状に湾曲する一対の左右湾曲部とからなり、左右湾曲部は、車幅方向外側に位置してバンパービームエクステンションに接続されるバンパービームエクステンション接続部と、車幅方向内側に位置してバンパービームのうちで前後方向外側に最も突出する荷重入力部とを備えるので、前後方向の衝突荷重を左右一対の荷重入力部で受けることで、荷重が入力する荷重入力部からバンパービームエクステンション接続部までの距離を小さくして衝突荷重によりバンパービームに作用する曲げモーメントを小さくし、バンパービームの必要強度を低減して軽量化を図ることができる。 Further, according to the fifth feature of the present invention, the bumper beam has a central curved portion concavely curved outward in the longitudinal direction at a central portion in the lateral direction of the vehicle and a lateral curved outer side on both sides in the lateral direction of the central curved portion. It consists of a pair of left and right curved parts that curve in a convex shape, and the left and right curved parts are located on the inner side in the vehicle width direction with the bumper beam extension connection part located on the outer side in the vehicle width direction and connected to the bumper beam extension Since the bumper beam and the load input portion that protrudes most to the outer side in the bumper beam are provided, by receiving the collision load in the front and rear direction with the left and right load input portions, the bumper beam extension connection from the load input portion to which the load is input Reduces the bending moment acting on the bumper beam due to collision load by reducing the distance to the part and reduces the required strength of the bumper beam It is possible to reduce the weight of Te.
　また本発明の第６の特徴によれば、バンパービームは上部フランジを前後方向内側に折り返した上部折り返し部と下部フランジを前後方向内側に折り返した下部折り返し部とを備えるので、衝突荷重によりバンパービームが口開き変形するのを特別の補強リブ等を設けることなく防止し、口開き変形した部分の車幅方向両側に応力が集中して亀裂や破壊が発生するのを防止することができる。 Further, according to the sixth feature of the present invention, since the bumper beam is provided with the upper folded portion formed by folding the upper flange inward in the front-rear direction and the lower folded portion formed by folding the lower flange in the longitudinal direction, the bumper beam It is possible to prevent the opening deformation without providing a special reinforcing rib or the like, and to prevent the occurrence of a crack or a failure due to the concentration of stress on both sides in the vehicle width direction of the opening deformed part.
　しかもバンパービームエクステンション接続部は少なくとも車幅方向内側の締結点および車幅方向外側の締結点でバンパービームエクステンションの本体部に締結され、上部折り返し部および下部折り返し部の車幅方向外端は車幅方向内側の締結点の近傍を終端とするので、前後方向の衝突荷重が入力したときにバンパービームの車幅方向外側の締結点によりバンパービームエクステンションからバンパービームに前後方向内向きの反力を作用させることで、バンパービームに作用する曲げモーメントの最大値を低減して局部的な破壊を防止することができる。 Moreover, the bumper beam extension connection portion is fastened to the main body of the bumper beam extension at least at the fastening point inside the vehicle width direction and the fastening point outside the vehicle width direction, and the vehicle width direction outer end of the upper folded portion and the lower folded portion is the vehicle width Since the terminal ends near the fastening point on the inner side, when the collision load in the front and rear direction is input, the fastening point on the outer side in the vehicle width direction of the bumper beam acts on the bumper beam from the bumper beam extension to the bumper beam By doing this, it is possible to reduce the maximum value of the bending moment acting on the bumper beam and to prevent local breakage.
　その際に、折り返し部の車幅方向外端は車幅方向内側の締結点の近傍を終端とするので、折り返し部が形成されないバンパービームの車幅方向外端部の剛性を低下させることで、車幅方向外側の締結点からバンパービームエクステンションに作用する前後方向外向きの荷重が過大になるのを防止し、バンパービームエクステンションの前後方向の圧壊が阻害されるのを回避することができる。 At that time, since the outer end of the folded portion in the vehicle width direction is terminated near the fastening point on the inner side in the vehicle width direction, the rigidity of the outer end portion of the bumper beam in which the folded portion is not formed is reduced. It is possible to prevent the front-rear direction outward load acting on the bumper beam extension from the fastening point on the outer side in the vehicle width direction from becoming excessive, and to prevent the crush of the bumper beam extension from being inhibited in the front-rear direction.
図１はバンパービームおよびバンパービームエクステンションの斜視図である。（第１の実施の形態）FIG. 1 is a perspective view of a bumper beam and a bumper beam extension. First Embodiment 図２は図１の２方向矢視図である。（第１の実施の形態）FIG. 2 is a view in the direction of arrows in FIG. First Embodiment 図３は図２の３－３線拡大断面図である。（第１の実施の形態）FIG. 3 is an enlarged sectional view taken along line 3-3 of FIG. First Embodiment 図４は図３の４部拡大図である。（第１の実施の形態）FIG. 4 is an enlarged view of part 4 of FIG. First Embodiment 図５は図２の５－５線拡大断面図である。（第１の実施の形態）FIG. 5 is an enlarged sectional view taken along line 5-5 of FIG. First Embodiment 図６は図２の６－６線拡大断面図である。（第１の実施の形態）6 is an enlarged cross-sectional view taken along line 6-6 of FIG. First Embodiment 図７はバンパービームを成形する金型の断面図である。（第１の実施の形態）FIG. 7 is a cross-sectional view of a mold for forming a bumper beam. First Embodiment 図８は図４に対応する図である。（第２の実施の形態）FIG. 8 is a diagram corresponding to FIG. Second Embodiment 図９はバンパービームおよびバンパービームエクステンションの斜視図である。（第３の実施の形態）FIG. 9 is a perspective view of a bumper beam and a bumper beam extension. Third Embodiment 図１０は図９の１０方向矢視図である。（第３の実施の形態）FIG. 10 is a view in the direction of arrow 10 in FIG. Third Embodiment 図１１は図９の１１方向拡大矢視図である。（第３の実施の形態）FIG. 11 is an enlarged view of an arrow 11 in FIG. Third Embodiment 図１２は図１１の１２－１２線拡大断面図である。（第３の実施の形態）12 is an enlarged sectional view taken along line 12-12 of FIG. Third Embodiment 図１３は図１１の１３－１３線拡大断面図である。（第３の実施の形態）FIG. 13 is an enlarged sectional view taken along line 13-13 of FIG. Third Embodiment 図１４は図１１の１４－１４線拡大断面図である。（第３の実施の形態）FIG. 14 is an enlarged sectional view taken along line 14-14 of FIG. Third Embodiment 図１５は図１１の１５－１５線拡大断面図である。（第３の実施の形態）FIG. 15 is an enlarged sectional view taken along line 15-15 of FIG. Third Embodiment 図１６はバンパービームを成形する金型の断面図である。（第３の実施の形態）FIG. 16 is a cross-sectional view of a mold for forming a bumper beam. Third Embodiment 図１７は衝突荷重によりバンパービームに作用する曲げモーメントの説明図である。（第３の実施の形態）FIG. 17 is an explanatory view of a bending moment acting on the bumper beam by the collision load. Third Embodiment 図１８は図１２に対応する図である。（第４の実施の形態）FIG. 18 is a diagram corresponding to FIG. Fourth Embodiment
１１　　　　バンパービーム
１２　　　　バンパービームエクステンション（衝撃吸収部材）
１４ａ　　　底壁
１４ｂ　　　上壁（側壁）
１４ｃ　　　下壁（側壁）
１４ｄ　　　上部フランジ
１４ｅ　　　下部フランジ
１４ｇ　　　上部折り返し部
１４ｈ　　　下部折り返し部
１５　　　　連続繊維強化樹脂シート
１６　　　　不連続繊維強化樹脂シート
１７　　　　第２の連続繊維強化樹脂シート
３３ａ′　　本体部
３５　　　　リベット（締結点）
Ａ　　　　　中央湾曲部
Ｂ　　　　　左右湾曲部
Ｂ１　　　　バンパービームエクステンション接続部（衝撃吸収部材接続部）
Ｂ２　　　　荷重入力部
Ｔ１　　　　底壁の板厚
Ｔ２　　　　側壁の板厚 11 bumper beam 12 bumper beam extension (impact absorbing member)
14a bottom wall 14b top wall (side wall)
14c Lower wall (side wall)
14d upper flange 14e lower flange 14g upper folded portion 14h lower folded portion 15 continuous fiber reinforced resin sheet 16 discontinuous fiber reinforced resin sheet 17 second continuous fiber reinforced resin sheet 33a 'main body 35 rivet (fastening point)
A Central curved portion B Left and right curved portion B1 Bumper beam extension connection portion (impact absorption member connection portion)
B2 Load input section T1 Bottom wall thickness T2 Side wall thickness
　以下、添付図面に基づいて本発明の実施の形態を説明する。尚、本明細書において前後方向、左右方向（車幅方向）および上下方向とは、運転席に着座した乗員を基準として定義される。 Hereinafter, an embodiment of the present invention will be described based on the attached drawings. In the present specification, the front-rear direction, the left-right direction (vehicle width direction), and the up-down direction are defined based on the occupant seated in the driver's seat.
第１の実施の形態First embodiment
　先ず、図１～図７に基づいて本発明の第１の実施の形態を説明する。 First, a first embodiment of the present invention will be described based on FIGS. 1 to 7.
　図１～図３に示すように、自動車の車体前部に繊維強化樹脂製のバンパービーム１１が車幅方向に配置されており、バンパービーム１１の車幅方向両端部が繊維強化樹脂製の左右一対のバンパービームエクステンション１２，１２の前端に支持され、バンパービームエクステンション１２，１２の後端が左右一対の金属製のフロントサイドフレーム１３，１３の前端に支持される。 As shown in FIGS. 1 to 3, a bumper beam 11 made of fiber reinforced resin is disposed in the vehicle width direction at the front of the vehicle body of an automobile, and both ends of the bumper beam 11 in the vehicle width direction are made of fiber reinforced resin. The rear ends of the bumper beam extensions 12, 12 are supported by the front ends of the left and right metal front side frames 13, 13.
　バンパービーム１１は、前方に向けて開放するＵ字状断面の上ビーム部１４Ｕおよび下ビーム部１４Ｌを上下に結合したＷ字状断面の部材であり、上ビーム部１４Ｕおよび下ビーム部１４Ｌは、後端に位置する底壁１４ａと、底壁１４ａの上端から前方に延びる上壁１４ｂと、底壁１４ａの下端から前方に延びる下壁１４ｃと、上ビーム部１４Ｕの上壁１４ｂの前端から上方に延びる上部フランジ１４ｄと、下ビーム部１４Ｌの下壁１４ｃの前端から下方に延びる下部フランジ１４ｅと、上ビーム部１４Ｕの下壁１４ｃおよび下ビーム部１４Ｌの上壁１４ｂを上下方向に接続する中間フランジ１４ｆとを備える。 The bumper beam 11 is a member having a W-shaped cross section in which an upper beam portion 14U and a lower beam portion 14L of a U-shaped cross section which are opened forward are coupled to the upper and lower sides. The upper beam portion 14U and the lower beam portion 14L are Bottom wall 14a located at the rear end, upper wall 14b extending forward from the upper end of bottom wall 14a, lower wall 14c extending forward from the lower end of bottom wall 14a, and upper end from the front end of upper wall 14b of upper beam portion 14U Between the upper flange 14d extending vertically, the lower flange 14e extending downward from the front end of the lower wall 14c of the lower beam portion 14L, and the lower wall 14c of the upper beam portion 14U and the upper wall 14b of the lower beam portion 14L in the vertical direction And a flange 14f.
　バンパービーム１１は、車幅方向中央の所定範囲において前方に向けて凹状に湾曲する中央湾曲部Ａと、中央湾曲部Ａの車幅方向両側において前方に向けて凸状に湾曲する一対の左右湾曲部Ｂ，Ｂとからなり、左右湾曲部Ｂは、車幅方向外側に位置してバンパービームエクステンション１２に接続されるバンパービームエクステンション接続部Ｂ１と、車幅方向内側に位置してバンパービーム１１のうちで前方に最も突出する荷重入力部Ｂ２とを備える。 Bumper beam 11 is a pair of left and right curves which curve in the front in the vehicle width direction on both sides in the vehicle width direction of center curved portion A that curves in a concave shape toward the front in a predetermined range in the center in the vehicle width direction. Parts B and B are formed, and the left and right bent parts B are located at the outer side in the vehicle width direction and connected to the bumper beam extension 12 and the bumper beam extension connection part B1; And a load input portion B2 that protrudes most forwardly.
　またバンパービームエクステンション接続部Ｂ１の上ビーム部１４Ｕおよび下ビーム部１４Ｌの車幅方向中間部は、それぞれ上壁１４ｂ、底壁１４ａおよび下壁１４ｃを接続するように上下方向かつ前後方向に延びる２枚の縦リブ１４ｊ，１４ｊを備えるとともに、上ビーム部１４Ｕおよび下ビーム部１４Ｌの車幅方向外端部は、それぞれ上壁１４ｂ、底壁１４ａおよび下壁１４ｃを接続するように上下方向かつ前後方向に延びる１枚の端壁１４ｋを備える。尚、バンパービーム１１の車幅方向内側の縦リブ１４ｊ…から端壁１４ｋ…までの間には、上部フランジ１４ｄ，１４ｄおよび下部フランジ１４ｅ，１４ｅは形成されていない（図１参照）。 Further, middle portions in the vehicle width direction of upper beam portion 14U and lower beam portion 14L of bumper beam extension connection portion B1 extend vertically and longitudinally so as to connect upper wall 14b, bottom wall 14a and lower wall 14c, respectively. Vertical rib 14j, 14j are provided, and the upper end of the upper beam portion 14U and the lower end of the lower beam portion 14L in the vehicle width direction are connected vertically to the upper wall 14b, the bottom wall 14a and the lower wall 14c respectively. It has one end wall 14k extending in the direction. Upper flanges 14d and 14d and lower flanges 14e and 14e are not formed between the longitudinal ribs 14j on the inner side in the vehicle width direction of the bumper beam 11 and the end walls 14k (see FIG. 1).
　バンパービーム１１の車幅方向中央部には金属製のカバー部材３１が装着される。カバー部材３１は、矩形状の本体部３１ａと、本体部３１ａの上下端を後方に折り曲げた係止部３１ｂ，３１ｃを備えており、本体部３１ａの上部および下部がバンパービーム１１の上部フランジ１４ｄおよび下部フランジ１４ｅにそれぞれリベット３２…で固定される。これにより、本体部３１ａの上端の係止部３１ｂがバンパービーム１１の上部フランジ１４ｄに上方から係合し、本体部３１ａの下端の係止部３１ｃがバンパービーム１１の下部フランジ１４ｅに下方から係合する。 A metal cover member 31 is attached to a central portion of the bumper beam 11 in the vehicle width direction. The cover member 31 includes a rectangular main body portion 31 a and locking portions 31 b and 31 c obtained by bending the upper and lower ends of the main body portion 31 a backward, and the upper and lower portions of the main body portion 31 a are upper flanges 14 d of the bumper beam 11. And fixed to the lower flange 14e by rivets 32. Thus, the locking portion 31b at the upper end of the main body portion 31a engages with the upper flange 14d of the bumper beam 11 from above, and the locking portion 31c at the lower end of the main body portion 31a engages with the lower flange 14e of the bumper beam 11 from below Match.
　バンパービーム１１は、後面側に位置する連続繊維強化樹脂シート１５と、前面側に位置する不連続繊維強化樹脂シート１６とを２層に積層して構成される。連続繊維強化樹脂シート１５は、車幅方向に配向したガラス連続繊維と、それと直交する上下方向あるいは前後方向に配向したガラス連続繊維とよりなる織布をナイロン樹脂で固めたものであり、不連続繊維強化樹脂シート１６は、ランダムに配向されて相互に絡み合うガラス不連続繊維をナイロン樹脂で固めたものである。 The bumper beam 11 is configured by laminating a continuous fiber reinforced resin sheet 15 located on the rear side and a discontinuous fiber reinforced resin sheet 16 located on the front side in two layers. The continuous fiber reinforced resin sheet 15 is formed by solidifying a woven fabric composed of continuous glass fibers oriented in the vehicle width direction and continuous glass fibers oriented in the vertical direction or the front-back direction orthogonal thereto with a nylon resin. The fiber-reinforced resin sheet 16 is formed by fixing glass discontinuous fibers which are randomly oriented and entangled with each other with a nylon resin.
　図７に示すように、バンパービーム１１をプレス成形する金型２１は、連続繊維強化樹脂シート１５の後面を成形する凹状のキャビティ２２ａ，２２ａを有する雌型２２と、不連続繊維強化樹脂シート１６の前面を成形する凸状のコア２３ａ，２３ａを有する雄型２３とからなり、コア２３ａ，２３ａには縦リブ１４ｊ…および端壁１４ｋ…を成形するための溝２３ｂ…が形成される。金型２１を型開きした状態で、雌型２２のキャビティ２２ａ，２２ａおよび雄型２３のコア２３ａ，２３ａ間に、連続繊維プリプレグ１５′と不連続繊維プリプレグ１６′とが予備加熱した状態で配置される。 As shown in FIG. 7, the mold 21 for press molding the bumper beam 11 is a negative mold 22 having concave cavities 22 a and 22 a for molding the rear surface of the continuous fiber reinforced resin sheet 15, and a discontinuous fiber reinforced resin sheet 16. Are formed with convex cores 23a and 23a for forming the front face of the head, and the longitudinal ribs 14j and grooves 23b for forming the end walls 14k are formed in the cores 23a and 23a. With the mold 21 open, the continuous fiber prepreg 15 'and the discontinuous fiber prepreg 16' are arranged between the cavities 22a, 22a of the female mold 22 and the cores 23a, 23a of the male mold 23 in a preheated state Be done.
　このとき、バンパービーム１１の底壁１４ａ，１４ａに対応する部分に、細幅の帯状に形成された第２の連続繊維プリプレグ１７′，１７′が、連続繊維プリプレグ１５′および不連続繊維プリプレグ１６′間に挟まれるように配置される。 At this time, the second continuous fiber prepregs 17 ′ and 17 ′ formed in a narrow band shape at portions corresponding to the bottom walls 14 a and 14 a of the bumper beam 11 are a continuous fiber prepreg 15 ′ and a discontinuous fiber prepreg 16. Placed so as to be sandwiched between.
　プリプレグは、カーボンファイバー、グラスファイバー、アラミドファイバー等の連続繊維よりなる平織や綾織などの織布やＵＤ（連続繊維を一方向に引き揃えたシート）、あるいは不連続繊維のマットを補強材とし、それに半硬化の熱硬化性樹脂（エポキシ樹脂やポリエステル樹脂等）、あるいは熱可塑性樹脂（ナイロン６やポリプロピレン等の）を含浸させたもので、金型の形状になじむ柔軟性を有している。熱硬化性樹脂の場合、複数枚のプリプレグを積層状態で金型内に挿入して圧力を加えながら例えば１３０°Ｃ程度に加熱すると、熱硬化性樹脂が硬化して繊維強化樹脂製品が得られる。本実施の形態の可塑性樹脂の場合、予備加熱した複数枚のプリプレグを積層状態で金型内に挿入して加圧成形し、その後冷却すると繊維強化樹脂製品が得られる。 The prepreg is a woven fabric such as plain weave or twill weave made of continuous fibers such as carbon fibers, glass fibers and aramid fibers, UD (sheet in which continuous fibers are aligned in one direction), or a mat of discontinuous fibers as a reinforcing material, It is impregnated with a semi-hardened thermosetting resin (such as epoxy resin and polyester resin) or a thermoplastic resin (such as nylon 6 or polypropylene), and has flexibility adapted to the shape of the mold. In the case of a thermosetting resin, when it is heated to, for example, about 130 ° C. while inserting a plurality of prepregs in a laminated state into a mold and applying pressure, the thermosetting resin is cured to obtain a fiber reinforced resin product . In the case of the plastic resin of the present embodiment, a plurality of preheated prepregs are inserted in a laminated state in a mold, pressure-molded, and then cooled to obtain a fiber reinforced resin product.
　本実施の形態では、連続繊維プリプレグ１５′および第２の連続繊維プリプレグ１７′，１７′の補強材は、ガラス連続繊維を相互に直交する方向に配向した織布であり、不連続繊維プリプレグ１６′の補強材は、ランダム配向した繊維長が５ｍｍ程度の長繊維からなるガラス不連続繊維の不織布である。 In the present embodiment, the reinforcing material of the continuous fiber prepreg 15 'and the second continuous fiber prepregs 17' and 17 'is a woven fabric in which continuous glass fibers are oriented in the direction orthogonal to each other, and the discontinuous fiber prepreg 16 The 'reinforcement' is a non-woven fabric of glass discontinuous fibers consisting of long fibers having a randomly oriented fiber length of about 5 mm.
　従って、雌型２２および雄型２３を型締めすると、連続繊維プリプレグ１５′および第２の連続繊維プリプレグ１７′，１７′が雌型２２のキャビティ２２ａ，２２ａと雄型２３のコア２３ａ，２３ａとによってプレスされ、Ｗ字状断面を有するバンパービーム１１の後面が成形される。このとき、不連続繊維プリプレグ１６′は容易に変形可能であるため、連続繊維プリプレグ１５′および第２の連続繊維プリプレグ１７′，１７′と雄型２３のコア２３ａ，２３ａとによって挟まれた不連続繊維プリプレグ１６′は、連続繊維プリプレグ１５′および第２の連続繊維プリプレグ１７′，１７′の前面に沿って薄い膜状に積層されるとともに、コア２３ａ，２３ａの溝２３ｂ…内に流入して縦リブ１４ｊ…および端壁１４ｋ…を同時に成形する。そして金型２１から取り出したバンパービーム１１の外周にはみ出した余剰部分を切断することで、バンパービーム１１を完成する。 Therefore, when the female mold 22 and the male mold 23 are clamped, the continuous fiber prepreg 15 'and the second continuous fiber prepregs 17' and 17 'are inserted into the cavities 22a and 22a of the female mold 22 and the cores 23a and 23a of the male mold 23. And the rear surface of the bumper beam 11 having a W-shaped cross section is formed. At this time, since the discontinuous fiber prepreg 16 'can be easily deformed, the continuous fiber prepreg 15' and the second continuous fiber prepregs 17 ', 17' and the core 23a, 23a of the male die 23 The continuous fiber prepreg 16 'is laminated in a thin film along the front surface of the continuous fiber prepreg 15' and the second continuous fiber prepregs 17 'and 17' and flows into the grooves 23b of the cores 23a and 23a. And the end walls 14k at the same time. Then, the excess portion protruding to the outer periphery of the bumper beam 11 taken out of the mold 21 is cut to complete the bumper beam 11.
　図４（Ａ）には、上述のようにして成形されバンパービーム１１の断面の板厚が示される。バンパービーム１１の底壁１４ａは、連続繊維プリプレグ１５′により構成される連続繊維強化樹脂シート１５と、第２の連続繊維プリプレグ１７′により構成される第２の連続繊維強化樹脂シート１７との２層構造になるため、底壁１４ａの板厚Ｔ１はバンパービーム１１の車幅方向全域に亙って上壁１４ｂおよび下壁１４ｃの板厚Ｔ２よりも大きくなる。 FIG. 4A shows the plate thickness of the cross section of the bumper beam 11 which is formed as described above. The bottom wall 14a of the bumper beam 11 is formed by the continuous fiber reinforced resin sheet 15 composed of the continuous fiber prepreg 15 'and the second continuous fiber reinforced resin sheet 17 composed of the second continuous fiber prepreg 17'. Because of the layered structure, the thickness T1 of the bottom wall 14a is larger than the thickness T2 of the upper wall 14b and the lower wall 14c over the entire area of the bumper beam 11 in the vehicle width direction.
　ただし、底壁１４ａの板厚Ｔ２はバンパービーム１１の車幅方向に変化する。即ち、左右の荷重入力部Ｂ２，Ｂ２の先端間の板厚Ｔ１は一定の最大値であり、そこから車幅方向外側に向かって次第に減少することでバンパービームエクステンション接続部Ｂ１の変形中心において最小値となり、そこから車幅方向外側に向かって次第に増加する。 However, the thickness T2 of the bottom wall 14a changes in the vehicle width direction of the bumper beam 11. That is, the thickness T1 between the front ends of the left and right load input portions B2 and B2 is a constant maximum value, and the thickness gradually decreases toward the outer side in the vehicle width direction, thereby minimizing the deformation center of the bumper beam extension connection portion B1. It becomes a value and gradually increases from there to the outside in the vehicle width direction.
　図１、図２、図５および図６に示すように、バンパービームエクステンション１２は、上下対称な形状を有する上部部材３３Ｕおよび下部部材３３Ｌを、それらの車幅方向外端に形成した側部フランジ３３ａ，３３ａおよび車幅方向内端に形成した側部フランジ３３ｂ，３３ｂで重ね合わせてリベット３４…で一体に結合し、前後方向に貫通するボックス状の閉断面に構成される。 As shown in FIG. 1, FIG. 2, FIG. 5 and FIG. 6, the bumper beam extension 12 is a side flange formed with an upper member 33U and a lower member 33L having symmetrical upper and lower shapes on their outer ends in the vehicle width direction. 33a, 33a and side flanges 33b, 33b formed at the inner end in the vehicle width direction are superposed and integrally joined by rivets 34, and configured in a box-like closed cross-section penetrating in the front-rear direction.
　また上部部材３３Ｕおよび下部部材３３Ｌの前端から前部フランジ３３ｃ，３３ｃがそれぞれ前上方および前下方に延びており、上部部材３３Ｕの前部フランジ３３ｃはバンパービームエクステンション１２の上壁１４ｂにリベット３５…で結合され、下部部材３３Ｌの前部フランジ３３ｃはバンパービームエクステンション１２の下壁１４ｃにリベット３５…で結合される。これによりバンパービーム１１のバンパービームエクステンション接続部Ｂ１は、バンパービームエクステンション１２の前部フランジ３３ｃ，３３ｃにより上下から挟まれるように固定される。 Also, front flanges 33c, 33c extend from the front end of the upper member 33U and the lower member 33L to the front upper and front lower, respectively, and the front flange 33c of the upper member 33U is riveted to the upper wall 14b of the bumper beam extension 12 ... The front flange 33c of the lower member 33L is connected to the lower wall 14c of the bumper beam extension 12 by rivets 35. As a result, the bumper beam extension connection portion B1 of the bumper beam 11 is fixed by the front flanges 33c and 33c of the bumper beam extension 12 so as to be vertically sandwiched.
　バンパービームエクステンション１２の上部部材３３Ｕおよび下部部材３３Ｌは、車幅方向外側の側部フランジ３３ａ，３３ａの前端および前部フランジ３３ｃ，３３ｃの車幅方向外端に連なる前壁３３ｄ，３３ｄを備えており、これらの側部フランジ３３ａ，３３ａ、前部フランジ３３ｃ，３３ｃおよび前壁３３ｄ，３３ｄによってバンパービーム１１のバンパービームエクステンション接続部Ｂ１の車幅方向外端が覆われる。 The upper member 33U and the lower member 33L of the bumper beam extension 12 have front walls 33d, 33d connected to the front ends of the side flanges 33a, 33a on the outer side in the vehicle width direction and the outer ends in the vehicle width direction of the front flanges 33c, 33c. The side flanges 33a and 33a, the front flanges 33c and 33c, and the front walls 33d and 33d cover the outer end of the bumper beam extension connection B1 of the bumper beam 11 in the vehicle width direction.
　次に、上記構成を備えた本発明の第１の実施の形態の作用を説明する。 Next, the operation of the first embodiment of the present invention having the above configuration will be described.
　自車のバンパービームが他車のバンパービームに前面衝突したような場合、図２に示すように、本実施の形態のバンパービーム１１は前方に向けて凹状に湾曲する中央湾曲部Ａを備えるため、中央湾曲部Ａの車幅方向両側の一対の荷重入力部Ｂ２，Ｂ２の先端が他車のバンパービームに衝突し、一対の荷重入力部Ｂ２，Ｂ２の先端の２点に衝突荷重Ｆが集中的に入力する。その結果、バンパービーム１１に作用する曲げモーメントの最大値が低減するだけでなく、中央湾曲部Ａを含む一対の荷重入力部Ｂ２，Ｂ２の先端（荷重Ｆの入力点）に挟まれた領域に引張荷重が作用し、バンパービームエクステンション接続部Ｂ１，Ｂ１に圧縮荷重が作用し、バンパービームエクステンション接続部Ｂ１，Ｂ１と荷重入力部Ｂ２，Ｂ２の先端とに挟まれた狭い領域だけが捩じり（剪断）変形することになり、捩じり変形によるバンパービーム１１の口開きが抑制されて破壊強度が高められる。 When the bumper beam of the own vehicle collides with the bumper beam of the other vehicle in front, as shown in FIG. 2, the bumper beam 11 of the present embodiment is provided with the central curved portion A which is concavely curved forward. The tips of the pair of load input portions B2 and B2 on both sides in the vehicle width direction of the central curved portion A collide with bumper beams of other vehicles, and the collision load F concentrates at two points of the tips of the pair load input portions B2 and B2. Input. As a result, not only the maximum value of the bending moment acting on the bumper beam 11 is reduced, but also in a region sandwiched by the tips of the pair of load input portions B2 and B2 including the central curved portion A (input point of load F). A tensile load is applied, a compressive load is applied to the bumper beam extension connections B1 and B1, and only a narrow region sandwiched between the bumper beam extension connections B1 and B1 and the tips of the load input parts B2 and B2 is twisted. As a result of (shearing) deformation, the opening of the bumper beam 11 due to torsional deformation is suppressed, and the breaking strength is enhanced.
　またバンパービーム１１に前方からの衝突荷重が入力すると、左右の曲げ中心間のバンパービーム１１が後方に湾曲するように変形するため（図２の鎖線参照）、バンパービーム１１の後面側に引張荷重が作用し、バンパービーム１１の前面側に圧縮荷重が作用する（図３参照）。 Further, when a collision load from the front is input to the bumper beam 11, the bumper beam 11 between the left and right bending centers is deformed so as to curve backward (see the chain line in FIG. 2). The load acts on the front side of the bumper beam 11 (see FIG. 3).
　本実施の形態によれば、引張荷重が作用するバンパービーム１１の後面側が引張荷重に強い連続繊維強化樹脂シート１５で構成されており、その連続繊維強化樹脂シート１５の相互に直交する方向に配向された連続繊維のうち、特に車幅方向に配向された連続繊維が引張荷重に抵抗することで、バンパービーム１１の軽量化を図りながら曲げ変形に対する強度を高めて衝突エネルギーの吸収性能を向上させることができる。 According to the present embodiment, the rear surface side of the bumper beam 11 to which the tensile load acts is formed of the continuous fiber reinforced resin sheet 15 which is resistant to the tensile load, and the continuous fiber reinforced resin sheet 15 is oriented in the direction orthogonal to each other. Among the continuous fibers thus made, the continuous fibers oriented in the vehicle width direction in particular resist the tensile load, thereby increasing the strength against bending deformation while improving the weight reduction of the bumper beam 11, thereby improving the collision energy absorption performance. be able to.
　また本実施の形態によれば、圧縮荷重が作用するバンパービーム１１の前面側が圧縮荷重に強い不連続繊維強化樹脂シート１６で構成されており、ランダムに配向されて絡み合った不連続繊維が圧縮荷重に抵抗することで、バンパービーム１１の軽量化を図りながら曲げ変形に対する強度を高めて衝突エネルギーの吸収性能をより一層向上させることができる。 Further, according to the present embodiment, the front side of the bumper beam 11 to which the compressive load acts is composed of the discontinuous fiber reinforced resin sheet 16 which is resistant to the compressive load, and the randomly oriented and entangled discontinuous fibers are compressed. By reducing the weight of the bumper beam 11, it is possible to increase the strength against bending deformation and to further improve the collision energy absorption performance.
　図２に示すように、バンパービーム１１の左右の荷重入力部Ｂ２，Ｂ２の先端に衝突荷重Ｆが入力したとき、左右の荷重入力部Ｂ２，Ｂ２の先端間に作用する曲げモーメントは一定の最大値となり、そこから車幅方向外側に向かって次第に減少することでバンパービームエクステンション接続部Ｂ１の変形中心において最小値となり、そこから車幅方向外側に向かって次第に増加する。つまり、バンパービーム１１の底壁１４ａの板厚Ｔ１（図４（Ａ）参照）は、そこに作用する曲げモーメントの大きさに応じて設定され、曲げモーメントが大きい部分では板厚Ｔ１が大きくなり、曲げモーメントが小さい部分では板厚Ｔ１が小さくなる。これにより、バンパービーム１１の車幅方向の強度分布を最適化して重量を最小限に抑えながら、必要な曲げ強度を確保することができる。 As shown in FIG. 2, when a collision load F is input to the tip of the left and right load input parts B2 and B2 of the bumper beam 11, the bending moment acting between the tips of the left and right load input parts B2 and B2 is a constant maximum. As the value gradually decreases toward the outer side in the vehicle width direction from there, it becomes the minimum value at the deformation center of the bumper beam extension connection portion B1, and gradually increases outward from the vehicle width direction. That is, the plate thickness T1 (see FIG. 4A) of the bottom wall 14a of the bumper beam 11 is set in accordance with the magnitude of the bending moment acting thereon, and the plate thickness T1 becomes large in the portion where the bending moment is large. The plate thickness T1 decreases at portions where the bending moment is small. As a result, the required bending strength can be secured while optimizing the strength distribution in the vehicle width direction of the bumper beam 11 and minimizing the weight.
　特に、底壁１４ａはバンパービーム１１の後端に位置するため、バンパービーム１１の前後方向の曲げ変形に関する断面係数の増加に大きく寄与し、底壁１４ａの板厚Ｔ１を増加させることで、重量の増加を最小限に抑えて断面係数を効果的に増加させることができる。 In particular, since the bottom wall 14a is located at the rear end of the bumper beam 11, it greatly contributes to the increase of the cross section coefficient related to the bending deformation in the back and forth direction of the bumper beam 11, thereby increasing the thickness T1 of the bottom wall 14a. The cross section coefficient can be effectively increased by minimizing the increase of.
　更に、底壁１４ａの連続繊維強化樹脂シート１５に第２の連続繊維強化樹脂シート１７を積層することで、底壁１４ａの板厚Ｔ１を上壁１４ｂおよび下壁１４ｃの板厚Ｔ２よりも大きくしたので、底壁１４ａの連続繊維の量を増加させて引張荷重に対する強度を高めることができる。 Furthermore, by laminating the second continuous fiber reinforced resin sheet 17 on the continuous fiber reinforced resin sheet 15 of the bottom wall 14a, the thickness T1 of the bottom wall 14a is larger than the thickness T2 of the upper wall 14b and the lower wall 14c. Therefore, the amount of continuous fibers in the bottom wall 14a can be increased to increase the strength against tensile load.
　またバンパービーム１１は車幅方向中央部にカバー部材３１を備え、カバー部材３１は最上位の上壁１４ｂおよび最下位の下壁１４ｃ間を上下方向に接続するので、前後方向の衝突荷重が入力したときにバンパービーム１１が口開き変形するのを防止して断面形状を維持し、曲げ応力や剪断応力に対する強度を高めることができる。 Further, the bumper beam 11 is provided with a cover member 31 at the center in the vehicle width direction, and the cover member 31 vertically connects between the top wall 14b and the bottom wall 14c at the lowest position, so that a collision load in the front and rear direction is input. When this occurs, the bumper beam 11 can be prevented from opening deformation, the cross-sectional shape can be maintained, and the strength against bending stress and shearing stress can be enhanced.
　しかもバンパービーム１１は不連続繊維強化樹脂シート１６を圧縮成形して構成された縦リブ１４ｊ…および端壁１４ｋ…を備えるので、衝突荷重が入力したときにバンパービーム１１が口開き変形するのを防止して断面形状を維持し、曲げ応力や剪断応力に対する強度を高めることができる。 Moreover, since the bumper beam 11 includes the longitudinal ribs 14 j and the end walls 14 k which are formed by compression molding the discontinuous fiber reinforced resin sheet 16, the bumper beam 11 is subjected to opening deformation when a collision load is input. It can be prevented to maintain the cross sectional shape, and the strength against bending stress and shearing stress can be enhanced.
　またバンパービームエクステンション接続部Ｂ１の車幅方向外端を、バンパービームエクステンション１２の上部部材３３Ｕおよび下部部材３３Ｌの側部フランジ３３ａ，３３ａ、前部フランジ３３ｃ，３３ｃおよび前壁３３ｄ，３３ｄによって覆ったので、前後方向の衝突荷重が入力したときにバンパービーム１１の車幅方向外端部が口開き変形するのを防止し、衝突荷重をバンパービーム１１からバンパービームエクステンション１２に確実に伝達して効率的に吸収することができる。 Further, the vehicle width direction outer end of the bumper beam extension connection portion B1 is covered by the side flanges 33a and 33a, the front flanges 33c and 33c and the front walls 33d and 33d of the upper member 33U and the lower member 33L of the bumper beam extension 12 Therefore, when the collision load in the front-rear direction is input, the vehicle width direction outer end of the bumper beam 11 is prevented from opening deformation, and the collision load is reliably transmitted from the bumper beam 11 to the bumper beam extension 12 to improve efficiency. Can be absorbed.
第２の実施の形態Second embodiment
　次に、図８に基づいて本発明の第２の実施の形態を説明する。第１の実施の形態に対応する部材は同じ符号を用いて表示する。 Next, a second embodiment of the present invention will be described based on FIG. The members corresponding to the first embodiment are indicated using the same reference numerals.
　第１の実施の形態では、バンパービーム１１の底壁１４ａの板厚Ｔ１を、上壁１４ｂおよび下壁１４ｃの板厚Ｔ２よりも大きくする手段として、底壁１４ａにおいて連続繊維強化樹脂シート１５に第２の連続繊維強化樹脂シート１７を積層しているが、第２の実施の形態では、第２の連続繊維強化樹脂シート１７を廃止し、その代わりに底壁１４ａにおける不連続繊維強化樹脂シート１６の板厚を増加させている。バンパービーム１１の加圧成形時に不連続繊維強化樹脂シート１６は金型２１内で任意の形状に変形可能であるため、その板厚を変化させることは容易である。 In the first embodiment, the continuous fiber reinforced resin sheet 15 is formed on the bottom wall 14a as a means to make the thickness T1 of the bottom wall 14a of the bumper beam 11 larger than the thickness T2 of the upper wall 14b and the lower wall 14c. Although the second continuous fiber reinforced resin sheet 17 is laminated, in the second embodiment, the second continuous fiber reinforced resin sheet 17 is eliminated, and instead a discontinuous fiber reinforced resin sheet in the bottom wall 14a The thickness of 16 is increased. Since the discontinuous fiber reinforced resin sheet 16 can be deformed into an arbitrary shape in the mold 21 at the time of pressure forming of the bumper beam 11, it is easy to change its thickness.
　本実施の形態によれば、底壁１４ａの不連続繊維強化樹脂シート１６を上壁１４ｂおよび下壁１４ｃの不連続繊維強化樹脂シート１６よりも厚くすることで、底壁１４ａの板厚Ｔ１を上壁１４ｂおよび下壁１４ｃの板厚Ｔ２よりも大きくしたので、底壁１４ａにおける不連続繊維の量を増加させて圧縮荷重に対する強度を高めることができる。 According to the present embodiment, by making the discontinuous fiber reinforced resin sheet 16 of the bottom wall 14a thicker than the discontinuous fiber reinforced resin sheet 16 of the upper wall 14b and the lower wall 14c, the thickness T1 of the bottom wall 14a can be increased. Since the thickness T2 of the upper wall 14b and the lower wall 14c is larger than the thickness T2, the amount of discontinuous fibers in the bottom wall 14a can be increased to enhance the strength against compressive load.
第３の実施の形態Third embodiment
　次に、図９～図１７に基づいて本発明の第３の実施の形態を説明する。前述の実施の形態に対応する部材は同じ符号を用いて表示し、詳細な説明は省略し、同様に得られる作用についても記載を省略する。 Next, a third embodiment of the present invention will be described based on FIGS. 9 to 17. The members corresponding to the above-mentioned embodiment are indicated using the same reference numerals, and the detailed description is omitted, and the description of the similarly obtained actions is also omitted.
　バンパービーム１１は、前方に向けて開放するＵ字状断面の上ビーム部１４Ｕおよび下ビーム部１４Ｌを上下に結合したＷ字状断面の部材であり、上ビーム部１４Ｕおよび下ビーム部１４Ｌは、後端に位置する底壁１４ａと、底壁１４ａの上端から前方に延びる上壁１４ｂと、底壁１４ａの下端から前方に延びる下壁１４ｃと、上ビーム部１４Ｕの上壁１４ｂの前端から上方に延びる上部フランジ１４ｄと、下ビーム部１４Ｌの下壁１４ｃの前端から下方に延びる下部フランジ１４ｅと、上ビーム部１４Ｕの下壁１４ｃおよび下ビーム部１４Ｌの上壁１４ｂを上下方向に接続する中間フランジ１４ｆと、上部フランジ１４ｄの上端を後方に折り返した上部折り返し部１４ｇと、下部フランジ１４ｅの下端を後方に折り返した下部折り返し部１４ｈとを備える。 The bumper beam 11 is a member having a W-shaped cross section in which an upper beam portion 14U and a lower beam portion 14L of a U-shaped cross section which are opened forward are coupled to the upper and lower sides. The upper beam portion 14U and the lower beam portion 14L are Bottom wall 14a located at the rear end, upper wall 14b extending forward from the upper end of bottom wall 14a, lower wall 14c extending forward from the lower end of bottom wall 14a, and upper end from the front end of upper wall 14b of upper beam portion 14U Between the upper flange 14d extending vertically, the lower flange 14e extending downward from the front end of the lower wall 14c of the lower beam portion 14L, and the lower wall 14c of the upper beam portion 14U and the upper wall 14b of the lower beam portion 14L in the vertical direction A flange 14f, an upper folded portion 14g obtained by folding the upper end of the upper flange 14d rearward, and a lower folded portion obtained by folding the lower end of the lower flange 14e rearward And a 4h.
　またバンパービームエクステンション接続部Ｂ１の上ビーム部１４Ｕおよび下ビーム部１４Ｌの車幅方向中間部は、それぞれ上壁１４ｂ、底壁１４ａおよび下壁１４ｃを接続するように上下方向かつ前後方向に延びる２枚の縦リブ１４ｊ，１４ｊを備えるとともに、上ビーム部１４Ｕおよび下ビーム部１４Ｌの車幅方向外端部は、それぞれ上壁１４ｂ、底壁１４ａおよび下壁１４ｃを接続するように上下方向かつ前後方向に延びる１枚の端壁１４ｋを備える。尚、バンパービーム１１の車幅方向内側の縦リブ１４ｊ…から端壁１４ｋ…までの間には、上部フランジ１４ｄ，１４ｄ、下部フランジ１４ｅ，１４ｅ、上部折り返し部１４ｇおよび下部折り返し部１４ｈは形成されていない（図９参照）。 Further, middle portions in the vehicle width direction of upper beam portion 14U and lower beam portion 14L of bumper beam extension connection portion B1 extend vertically and longitudinally so as to connect upper wall 14b, bottom wall 14a and lower wall 14c, respectively. Vertical rib 14j, 14j are provided, and the upper end of the upper beam portion 14U and the lower end of the lower beam portion 14L in the vehicle width direction are connected vertically to the upper wall 14b, the bottom wall 14a and the lower wall 14c respectively. It has one end wall 14k extending in the direction. Upper flanges 14d and 14d, lower flanges 14e and 14e, upper folds 14g and lower folds 14h are formed between the longitudinal ribs 14j on the inner side in the vehicle width direction of the bumper beam 11 and the end walls 14k. Not (see Figure 9).
　バンパービーム１１の車幅方向中央部には金属製の引張部材１３１が装着される。引張部材１３１は、矩形状の本体部３１ａ′と、本体部３１ａ′の上下端を後方に折り曲げた係止部３１ｂ′，３１ｃ′を備えており、上端の係止部３１ｂ′および下端の係止部３１ｃ′が、バンパービーム１１の上部フランジ１４ｄの上部折り返し部１４ｇおよび下部フランジ１４ｅの下部折り返し部１４ｈにそれぞれクリップ３２′，３２′で固定される。これにより、引張部材１３１の上端の係止部３１ｂ′がバンパービーム１１の上部折り返し部１４ｇに上方から係合し、引張部材１３１の下端の係止部３１ｃ′がバンパービーム１１の下部折り返し部１４ｈに下方から係合する。 A metal tension member 131 is attached to a central portion of the bumper beam 11 in the vehicle width direction. The tension member 131 includes a rectangular main body portion 31a ', and locking portions 31b' and 31c 'obtained by bending the upper and lower ends of the main body portion 31a' backward, and the engagement portion 31b 'at the upper end and the engagement at the lower end Stops 31c 'are fixed to upper folded portion 14g of upper flange 14d of bumper beam 11 and lower folded portion 14h of lower flange 14e by clips 32' and 32 ', respectively. Thus, the locking portion 31b 'at the upper end of the tension member 131 engages with the upper folded portion 14g of the bumper beam 11 from above, and the locking portion 31c' at the lower end of the tension member 131 is the lower folded portion 14h of the bumper beam 11 Engage from below.
　本実施の形態では、連続繊維プリプレグ１５′の補強材は、ガラス連続繊維を相互に直交する方向に配向した織布であり、不連続繊維プリプレグ１６′の補強材は、ランダム配向した繊維長が３０ｍｍ程度の長繊維からなるガラス不連続繊維の不織布である（図１６参照）。 In the present embodiment, the reinforcing material of the continuous fiber prepreg 15 'is a woven fabric in which continuous glass fibers are oriented in directions orthogonal to each other, and the reinforcing material of the discontinuous fiber prepreg 16' has a randomly oriented fiber length. It is a non-woven fabric of glass discontinuous fibers consisting of long fibers of about 30 mm (see FIG. 16).
　従って、雌型２２および雄型２３を型締めすると、連続繊維プリプレグ１５′が雌型２２のキャビティ２２ａ，２２ａと雄型２３のコア２３ａ，２３ａとによってプレスされ、Ｗ字状断面を有するバンパービーム１１の後面が成形される。このとき、不連続繊維プリプレグ１６′は容易に変形可能であるため、連続繊維プリプレグ１５′と雄型２３のコア２３ａ，２３ａとによって挟まれた不連続繊維プリプレグ１６′は、連続繊維プリプレグ１５′の前面に沿って薄い膜状に積層されるとともに、コア２３ａ，２３ａの溝２３ｂ…内に流入して縦リブ１４ｊ…および端壁１４ｋ…を成形し、かつ上部折り返し部１４ｇおよび下部折り返し部１４ｈを同時に成形する。そして金型２１から取り出したバンパービーム１１の外周にはみ出した余剰部分を切断することで、バンパービーム１１を完成する。このように、成形性の高い不連続繊維強化樹脂シート１６により、複雑な断面形状のバンパービーム１１を容易に成形することができる。 Therefore, when the female mold 22 and the male mold 23 are clamped, the continuous fiber prepreg 15 'is pressed by the cavities 22a, 22a of the female mold 22 and the cores 23a, 23a of the male mold 23, and a bumper beam having a W-shaped cross section The back of 11 is molded. At this time, since the discontinuous fiber prepreg 16 'can be easily deformed, the discontinuous fiber prepreg 16' sandwiched by the continuous fiber prepreg 15 'and the cores 23a and 23a of the male die 23 is the continuous fiber prepreg 15'. And flow into the grooves 23b of the cores 23a, 23a to form the longitudinal ribs 14j and the end walls 14k, and the upper folded portion 14g and the lower folded portion 14h At the same time. Then, the excess portion protruding to the outer periphery of the bumper beam 11 taken out of the mold 21 is cut to complete the bumper beam 11. Thus, the bumper beam 11 having a complicated cross-sectional shape can be easily formed by the discontinuous fiber-reinforced resin sheet 16 having high formability.
　圧縮された不連続繊維プリプレグ１６′がコア２３ａ，２３ａの溝２３ｂ…内に流入して縦リブ１４ｊ…を成形する際に、不連続繊維プリプレグ１６′に含まれる不連続繊維の長手方向が流れの方向に沿って整列することで、縦リブ１４ｊ…の強度が効果的に高められる（図１４の鎖線枠内参照）。 When compressed discontinuous fiber prepregs 16 'flow into the grooves 23b of the cores 23a, 23a to form the longitudinal ribs 14j, the longitudinal direction of the discontinuous fibers contained in the discontinuous fiber prepregs 16' flows The strength of the longitudinal ribs 14 j can be effectively enhanced by aligning them along the direction of (see the dashed line frame in FIG. 14).
　図９～図１１および図１３～図１５に示すように、バンパービームエクステンション１２は上下対称な形状を有する上部部材３３Ｕおよび下部部材３３Ｌを備え、上部部材３３Ｕおよび下部部材３３Ｌのコ字状断面を有する本体部３３ａ′，３３ａ′を、それらの車幅方向外端に形成した側部フランジ３３ｂ′，３３ｂ′および車幅方向内端に形成した側部フランジ３３ｃ′，３３ｃ′で重ね合わせてリベット３４…で一体に結合することで、前後方向に貫通するボックス状の閉断面に構成される。 As shown in FIGS. 9 to 11 and 13 to 15, the bumper beam extension 12 includes an upper member 33U and a lower member 33L having a vertically symmetrical shape, and the U-shaped cross section of the upper member 33U and the lower member 33L The body portions 33a 'and 33a' are riveted together by side flanges 33b 'and 33b' formed at their outer ends in the vehicle width direction and side flanges 33c 'and 33c' formed at their inner ends in the vehicle width direction. By integrally connecting at 34 ..., it is configured as a box-like closed cross-section penetrating in the front-rear direction.
　また車幅方向内側の側部フランジ３３ｃ′，３３ｃ′の前端から車幅方向内側に向けて三角形状の延長部３３ｄ′，３３ｄ′が張り出しており、本体部３３ａ′，３３ａ′の前端から延長部３３ｄ′，３３ｄ′の前端に跨がるようにバンパービーム取付部３３ｅ，３３ｅが形成される。上部部材３３Ｕのバンパービーム取付部３３ｅは、本体部３３ａ′から上方に立ち上がった後に前方に延び、前方に延びる部分がバンパービーム１１の上ビーム部１４Ｕの上壁１４ｂの上面に重ね合わされ、４本のリベット３５…で固定される。同様に下部部材３３Ｌのバンパービーム取付部３３ｅは、本体部３３ａ′から下方に立ち下がった後に前方に延び、前方に延びる部分がバンパービーム１１の下ビーム部１４Ｌの下壁１４ｃの下面に重ね合わされ、４本のリベット３５…で固定される。そして本体部３３ａ′の前側に連なるバンパービーム取付部３３ｅ，３３ｅの車幅方向外端に、バンパービーム１１の車幅方向外端を前方から覆う係止壁３３ｇ，３３ｇが形成される。 Further, triangular extending portions 33d 'and 33d' extend from the front end of the side flanges 33c 'and 33c' on the inner side in the vehicle width direction toward the inner side in the vehicle width direction, and extend from the front ends of the main body portions 33a 'and 33a' Bumper beam attachment portions 33e and 33e are formed to straddle the front ends of the portions 33d 'and 33d'. The bumper beam attaching portion 33e of the upper member 33U extends upward from the main body portion 33a 'and then extends forward, and a portion extending forward is superposed on the upper surface of the upper wall 14b of the upper beam portion 14U of the bumper beam 11 It is fixed by the rivet 35 ... of. Similarly, the bumper beam attachment portion 33e of the lower member 33L extends downward from the main body portion 33a 'and then extends forward, and a portion extending forward is superimposed on the lower surface of the lower wall 14c of the lower beam portion 14L of the bumper beam 11 , Fixed by four rivets 35. Further, locking walls 33g, 33g that cover the vehicle width direction outer end of the bumper beam 11 from the front are formed at the vehicle width direction outer ends of the bumper beam attachment portions 33e, 33e connected to the front side of the main body 33a '.
　次に、上記構成を備えた本発明の第３の実施の形態の作用を説明する。 Next, the operation of the third embodiment of the present invention having the above configuration will be described.
　自車のバンパービームが他車のバンパービームに前面衝突したような場合、図１０および図１７（Ａ）に示すように、本実施の形態のバンパービーム１１は、前述の実施の形態と同様に、捩じり変形による口開きが抑制されて破壊強度が高められる。 When the bumper beam of the own vehicle collides with the bumper beam of another vehicle in front, as shown in FIGS. 10 and 17A, the bumper beam 11 of the present embodiment is the same as the embodiment described above. The opening due to torsional deformation is suppressed and the breaking strength is enhanced.
　このとき、バンパービームエクステンション１２はバンパービーム１１の変形中心よりも車幅方向内側に延長されてバンパービームエクステンション接続部Ｂ１に接続される延長部３３ｄ′，３３ｄ′を備えるので、前面衝突の衝突荷重が入力したときにバンパービーム１１の変形中心の位置を車幅方向内側に移動させ、バンパービーム１１に作用する曲げモーメントの最大値を低下させることで、バンパービーム１１を軽量化しながら局部的な破壊を防止することができる。しかも前後方向に見たときにバンパービームエクステンション１２の延長部３３ｄ′，３３ｄ′はバンパービーム１１の上部折り返し部１４ｇおよび下部折り返し部１４ｈにオーバーラップするので、衝突荷重をバンパービーム１１からバンパービームエクステンション１２の延長部３３ｄ′，３３ｄ′に効率的に伝達し、延長部３３ｄ′，３３ｄ′を座屈変形させて衝突エネルギーを吸収することができる。 At this time, since the bumper beam extension 12 is extended inward in the vehicle width direction with respect to the deformation center of the bumper beam 11 and includes the extension portions 33d 'and 33d' connected to the bumper beam extension connection portion B1, the collision load of the frontal collision The position of the center of deformation of the bumper beam 11 is moved inward in the vehicle width direction when the character is input, and the maximum value of the bending moment acting on the bumper beam 11 is reduced to reduce the bumper beam 11 while reducing the weight locally Can be prevented. Moreover, when viewed in the front-rear direction, the extensions 33d 'and 33d' of the bumper beam extension 12 overlap the upper folds 14g and the lower folds 14h of the bumper beam 11, so the collision load is from the bumper beam 11 to the bumper beam extensions The energy can be efficiently transmitted to the twelve extensions 33d 'and 33d', and the extensions 33d 'and 33d' can be buckled to absorb collision energy.
　本実施の形態によれば、バンパービーム１１は車幅方向中央部に引張部材１３１を備え、引張部材１３１は上部折り返し部１４ｇおよび下部折り返し部１４ｈ間を上下方向に接続するので、前後方向の衝突荷重が入力したときにバンパービーム１１が口開き変形するのを一層確実に防止して断面形状を維持し、曲げ応力や剪断応力に対する強度を高めることができる。 According to the present embodiment, the bumper beam 11 includes the tension member 131 at the center in the vehicle width direction, and the tension member 131 vertically connects between the upper folded portion 14g and the lower folded portion 14h. When the load is input, the bumper beam 11 can be more reliably prevented from opening deformation, the cross-sectional shape can be maintained, and the strength against bending stress and shearing stress can be enhanced.
　図１７（Ａ）に示すように、バンパービーム１１の左右の荷重入力部Ｂ２，Ｂ２の先端に衝突荷重Ｆが入力したとき、左右の荷重入力部Ｂ２，Ｂ２の先端間に作用する曲げモーメントは一定の最大値となり、そこから車幅方向外側に向かって次第に減少することでバンパービームエクステンション接続部Ｂ１の変形中心において最小値となる。 As shown in FIG. 17A, when a collision load F is input to the tips of the left and right load input parts B2 and B2 of the bumper beam 11, the bending moment acting between the tips of the left and right load input parts B2 and B2 is It becomes a minimum at the center of deformation of the bumper beam extension connection B1 by becoming a constant maximum value and gradually decreasing outward therefrom in the vehicle width direction.
　バンパービームエクステンション１２のバンパービーム取付部３３ｅ，３３ｅをバンパービーム１１のバンパービームエクステンション接続部Ｂ１に固定する上下各４本のリベット３５…のうち、上下各３本のリベット３５…が本体部３３ａ′，３３ａ′の前方に位置している。これら３本のリベット３５…のうち、最も車幅方向内側に位置するリベット３５（車幅方向内側の締結点）の近傍が前記変形中心となり、最も車幅方向外側に位置するリベット３５（車幅方向外側の締結点）の近傍に前記係止壁３３ｇが形成される。 Of the four upper and lower rivets 35 for fixing the bumper beam attachment portions 33e and 33e of the bumper beam extension 12 to the bumper beam extension connection portion B1 of the bumper beam 11, three upper and lower rivets 35 are main body portions 33a ' , 33a 'in front of. Among these three rivets 35, the rivet 35 (fastening point on the inner side in the vehicle width direction) located closest to the inner side in the vehicle width direction is the center of deformation, and the rivet 35 (vehicle width on the outermost side in the vehicle width direction). The locking wall 33g is formed in the vicinity of the fastening point (outside fastening point).
　図１７（Ａ）に示すように、仮に、バンパービーム１１の車幅方向外端部がバンパービームエクステンション１２に固定されていないとすると、バンパービーム１１の変形中心において曲げモーメントがゼロになり、荷重の入力点において曲げモーメントが最大値となる。 As shown in FIG. 17A, assuming that the outer end of the bumper beam 11 in the vehicle width direction is not fixed to the bumper beam extension 12, the bending moment becomes zero at the deformation center of the bumper beam 11, and the load The bending moment becomes maximum at the input point of.
　しかしながら、実際にはバンパービーム１１の車幅方向外端部がバンパービームエクステンション１２にリベット３５で固定され、かつ係止壁３３ｇでバンパービームエクステンション１２の前端に係止されているため、衝突荷重の入力時に変形中心を支点として前方に移動しようとするバンパービーム１１の車幅方向外端部が、バンパービームエクステンション１２から後向きの荷重ｆを受けることになる。この荷重ｆにより、図１７（Ｂ）に示すように、バンパービーム１１に逆向きの曲げモーメント（バンパービーム１１を前方に凸に変形させる曲げモーメント）が作用することで、荷重の入力点に作用する曲げモーメントが最大値が低減し、これにより荷重の入力点におけるバンパービーム１１の局部的な破壊を防止することができる。 However, in fact, the outer end of the bumper beam 11 in the vehicle width direction is fixed to the bumper beam extension 12 by the rivet 35 and is locked to the front end of the bumper beam extension 12 by the locking wall 33g. The vehicle width direction outer end of the bumper beam 11 which is about to move forward with the deformation center as the fulcrum at the time of input receives the rearward load f from the bumper beam extension 12. By this load f, as shown in FIG. 17 (B), a bending moment in the reverse direction (bending moment that causes the bumper beam 11 to be deformed in a forward direction) acts on the bumper beam 11, thereby acting on the load input point. The bending moment decreases its maximum value, which can prevent local destruction of the bumper beam 11 at the load input point.
　このとき、バンパービーム１１の車幅方向外端部をリベット３５だけでバンパービームエクステンション１２に固定すると、その部分に荷重が集中して破断する可能性があるが、前記リベット３５を補助するように係止壁３３ｇでバンパービームエクステンション１２およびバンパービーム１１を固定することで、バンパービーム１１の車幅方向外端部の破断を防止することができる。 At this time, if the outer end of the bumper beam 11 in the vehicle width direction is fixed to the bumper beam extension 12 only with the rivets 35, there is a possibility that the load may be concentrated on that portion and fractured. By fixing the bumper beam extension 12 and the bumper beam 11 with the locking wall 33g, breakage of the vehicle width direction outer end of the bumper beam 11 can be prevented.
　ところで、バンパービームエクステンション１２は、バンパービーム１１から後向きの圧縮荷重を受けて圧壊することで衝突エネルギーを吸収するが、衝突荷重の入力時に変形中心を支点として前方に移動しようとするバンパービーム１１の車幅方向外端部に引っ張られ、バンパービームエクステンション１２の車幅方向外端部に前向きの荷重ｆ′が作用する（図１７（Ｂ）参照）。この荷重ｆ′はバンパービームエクステンション１２の圧壊を抑制する方向に作用するため、その大きさが過大になるとバンパービームエクステンション１２の安定した圧壊が阻害されてエネルギー吸収性能が低下する可能性がある。 By the way, although the bumper beam extension 12 absorbs collision energy by collapsing under compression load from the bumper beam 11, the bumper beam extension 12 tries to move forward with the deformation center as a fulcrum when the collision load is input. A forward load f 'is applied to the vehicle width direction outer end of the bumper beam extension 12 by being pulled to the vehicle width direction outer end (see FIG. 17B). Since this load f 'acts in the direction to suppress the crushing of the bumper beam extension 12, if the size thereof is excessive, the stable crushing of the bumper beam extension 12 may be inhibited and the energy absorbing performance may be reduced.
　しかしながら、本実施の形態によれば、バンパービーム１１の車幅方向内側の締結点であるリベット３５よりも車幅方向外側には上部折り返し部１４ｇおよび下部折り返し部１４ｈが形成されていないため、変形中心の車幅方向外側でバンパービーム１１の強度を敢えて低下させ、バンパービームエクステンション１２の車幅方向外端部で前向きの荷重ｆ′が過大になるのを防止することで、バンパービームエクステンション１２の安定した圧壊を可能にすることができる。 However, according to the present embodiment, the upper folded portion 14g and the lower folded portion 14h are not formed on the outer side in the vehicle width direction than the rivet 35 which is the fastening point on the inner side of the bumper beam 11 in the vehicle width direction. In the bumper beam extension 12 by reducing the strength of the bumper beam 11 on the outer side in the vehicle width direction of the center and preventing the forward load f 'from becoming excessive at the outer end of the bumper beam extension 12 in the vehicle width direction. It can make stable crushing possible.
　またバンパービーム１１のバンパービームエクステンション接続部Ｂ１は前後方向および上下方向に延びる縦リブ１４ｊ，１４ｊを備え、上部折り返し部１４ｇおよび下部折り返し部１４ｈの車幅方向外端は縦リブ１４ｊ，１４ｊの位置を超えて車幅方向外側に延びるので、衝突荷重がバンパービーム１１に入力したときに、バンパービーム１１の口開き変形を上部折り返し部１４ｇおよび下部折り返し部１４ｈだけでなく縦リブ１４ｊ，１４ｊにより一層確実に防止し、衝突荷重をバンパービーム１１からバンパービームエクステンション１２に一層確実に伝達して衝突エネルギーの吸収効果を高めることができる。 Bumper beam extension connecting portion B1 of bumper beam 11 is provided with longitudinal ribs 14j, 14j extending in the front and rear direction and in the vertical direction, and the outer ends of upper folded portion 14g and lower folded portion 14h are the positions of longitudinal ribs 14j, 14j When the collision load is input to the bumper beam 11, the opening deformation of the bumper beam 11 is further made by the vertical ribs 14j and 14j as well as the upper folded portion 14g and the lower folded portion 14h. This can be reliably prevented, and the collision load can be more reliably transmitted from the bumper beam 11 to the bumper beam extension 12 to enhance the absorption effect of collision energy.
第４の実施の形態Fourth embodiment
　次に、図１８に基づいて本発明の第４の実施の形態を説明する。前述の実施の形態に対応する部材は同じ符号を用いて表示する。 Next, a fourth embodiment of the present invention will be described based on FIG. The members corresponding to the above embodiment are indicated using the same reference numerals.
　第３の実施の形態の引張部材１３１は金属製であるが、本実施の形態の引張部材１３１′は繊維強化樹脂製であり、前側に位置する連続繊維強化樹脂シート１７ａと後側に位置する不連続繊維強化樹脂シート１８とを積層して構成される。そして引張部材１３１′の不連続繊維強化樹脂シート１８よりなる上下の係止部３１ｂ′，３１ｃ′の内面は、バンパービーム１１の不連続繊維強化樹脂シート１６よりなる上部フランジ１４ｄ、下部フランジ１４ｅ、上部折り返し部１４ｇおよび下部折り返し部１４ｈに振動溶着により固定される。 The tension member 131 of the third embodiment is made of metal, but the tension member 131 'of this embodiment is made of fiber reinforced resin, and is located behind the continuous fiber reinforced resin sheet 17a located on the front side. It is constructed by laminating the discontinuous fiber reinforced resin sheet 18. The inner surfaces of the upper and lower locking portions 31b 'and 31c' formed of the discontinuous fiber reinforced resin sheet 18 of the tension member 131 'are an upper flange 14d and a lower flange 14e formed of the discontinuous fiber reinforced resin sheet 16 of the bumper beam 11. It is fixed to the upper folded portion 14g and the lower folded portion 14h by vibration welding.
　このように、引張部材１３１′およびバンパービーム１１の不連続繊維強化樹脂シート１６，１８どうしを振動溶着することで溶着強度が高められるだけでなく、クリップ３２′，３２′のような特別の固定部材が不要になって部品点数の削減が可能になる。しかも引張部材１３１′の連続繊維強化樹脂シート１７ａが少なくとも上下方向に配向された連続繊維を含むことで、充分な引張強度を確保することができる。 Thus, not only welding strength is enhanced by vibration-welding the discontinuous fiber reinforced resin sheets 16 and 18 of the tension member 131 'and the bumper beam 11 but also special fixing such as the clips 32' and 32 '. The need for parts is eliminated and the number of parts can be reduced. Moreover, sufficient tensile strength can be secured by including the continuous fiber in which the continuous fiber reinforced resin sheet 17a of the tensile member 131 'is oriented at least in the vertical direction.
　以上、本発明の実施の形態を説明したが、本発明はその要旨を逸脱しない範囲で種々の設計変更を行うことが可能である。 As mentioned above, although embodiment of this invention was described, this invention can perform various design changes in the range which does not deviate from the summary.
　例えば、実施の形態ではフロント側のバンパービーム１１について説明したが、本発明はリヤ側のバンパービームに対しても適用することができる。フロント側のバンパービームの場合には，前後方向外側は前方に対応し、リヤ側のバンパービームの場合には，前後方向外側は後方に対応する。 For example, although the bumper beam 11 on the front side has been described in the embodiment, the present invention can also be applied to a bumper beam on the rear side. In the case of the bumper beam on the front side, the outer side in the front-rear direction corresponds to the front, and in the case of the bumper beam on the rear side, the outer side in the front-rear direction corresponds to the rear.
　また実施の形態のバンパービーム１１は前後方向外側に向けて開放するＷ字状断面を有するが、本発明のバンパービーム１９は前後方向外側に向けて開放するＵ字状（あるいはコ字状）断面を有するものであっても良い。 Further, although the bumper beam 11 of the embodiment has a W-shaped cross section opened outward in the front-rear direction, the bumper beam 19 of the present invention has a U-shaped (or U-shaped) cross section opened outward in the front-rear direction May be included.
　また実施の形態のバンパービームエクステンション１２は、フロントサイドフレームの前突で潰れて衝撃吸収する前端部や、リヤサイドフレームの後突で潰れて衝撃吸収する後端部といった、衝撃吸収部材であっても良い。 In addition, the bumper beam extension 12 according to the embodiment is an impact absorbing member such as a front end that is crushed by a front collision of a front side frame and absorbs impact, and a rear end that is crushed by a rear collision of a rear side frame and is absorbed by shock good.

Claims (6)

  1. 　Ｗ字状断面あるいはＵ字状断面を有するバンパービーム（１１）を、不連続繊維を含む不連続繊維強化樹脂シート（１６）と、連続繊維を含む連続繊維強化樹脂シート（１５）とを積層して構成した自動車用バンパーであって、
    　前記バンパービーム（１１）は、垂直に位置する底壁（１４ａ）と、前記底壁（１４ａ）の上下両端から水平方向に延びる側壁（１４ｂ，１４ｃ）とを備え、前記底壁（１４ａ）の板厚（Ｔ１）は前記側壁（１４ｂ，１４ｃ）の板厚（Ｔ２）よりも大きいことを特徴とする自動車用バンパー。     A bumper beam (11) having a W-shaped cross section or a U-shaped cross section is laminated with a discontinuous fiber reinforced resin sheet (16) containing discontinuous fibers and a continuous fiber reinforced resin sheet (15) containing continuous fibers A bumper for a motor vehicle,
    The bumper beam (11) comprises a vertically positioned bottom wall (14a) and side walls (14b, 14c) extending horizontally from upper and lower ends of the bottom wall (14a), and the bottom wall (14a) An automobile bumper characterized in that a thickness (T1) is larger than a thickness (T2) of the side walls (14b, 14c).
  2. 　前記底壁（１４ａ）の連続繊維強化樹脂シート（１５）に第２の連続繊維強化樹脂シート（１７）を積層することで、前記底壁（１４ａ）の板厚（Ｔ１）を前記側壁（１４ｂ，１４ｃ）の板厚（Ｔ２）よりも大きくしたことを特徴とする、請求項１に記載の自動車用バンパー。 By laminating a second continuous fiber reinforced resin sheet (17) on the continuous fiber reinforced resin sheet (15) of the bottom wall (14a), the thickness (T1) of the bottom wall (14a) can be reduced to the side wall (14b) , 14c), the bumper for an automobile according to claim 1, characterized in that the thickness is larger than the thickness (T2).
  3. 　前記底壁（１４ａ）の不連続繊維強化樹脂シート（１６）を前記側壁（１４ｂ，１４ｃ）の不連続繊維強化樹脂シート（１６）よりも厚くすることで、前記底壁（１４ａ）の板厚（Ｔ１）を前記側壁（１４ｂ，１４ｃ）の板厚（Ｔ２）よりも大きくしたことを特徴とする、請求項１に記載の自動車用バンパー。 By making the discontinuous fiber reinforced resin sheet (16) on the bottom wall (14a) thicker than the discontinuous fiber reinforced resin sheet (16) on the side walls (14b, 14c), the thickness of the bottom wall (14a) The automotive bumper according to claim 1, characterized in that (T1) is larger than the thickness (T2) of the side walls (14b, 14c).
  4. 　衝突荷重により前記バンパービーム（１１）に作用する曲げモーメントの分布に応じて前記底壁（１４ａ）の板厚（Ｔ１）を車幅方向に変化させたことを特徴とする、請求項１～請求項３の何れか１項に記載の自動車用バンパー。 The thickness (T1) of the bottom wall (14a) is changed in the vehicle width direction according to the distribution of bending moment acting on the bumper beam (11) due to collision load. The bumper for cars given in any 1 paragraph of paragraph 3.
  5. 　前記バンパービーム（１１）は、車幅方向中央部において前後方向外側に向けて凹状に湾曲する中央湾曲部（Ａ）と、前記中央湾曲部（Ａ）の車幅方向両側において前後方向外側に向けて凸状に湾曲する一対の左右湾曲部（Ｂ）とからなり、前記左右湾曲部（Ｂ）は、車幅方向外側に位置して衝撃吸収部材（１２）に接続される衝撃吸収部材接続部（Ｂ１）と、車幅方向内側に位置して前記バンパービーム（１１）のうちで前後方向外側に最も突出する荷重入力部（Ｂ２）とを備えることを特徴とする、請求項１に記載の自動車用バンパー。 The bumper beam (11) is directed in the front and rear direction outward on both sides in the vehicle width direction of a central curved portion (A) which is concavely curved outward in the front and rear direction at a central portion in the vehicle width direction. Shock-absorbing member connection portion which is formed of a pair of left and right curved portions (B) curved in a convex shape, and the left and right curved portions (B) are located on the outer side in the vehicle width direction and connected to the shock absorbing member (12) 2. The vehicle according to claim 1, further comprising: (B1), and a load input portion (B2) positioned on the inner side in the vehicle width direction and protruding most on the outer side in the front-rear direction in the bumper beam (11). Car bumpers.
  6. 　前記バンパービーム（１１）は上部フランジ（１４ｄ）を前後方向内側に折り返した上部折り返し部（１４ｇ）と下部フランジ（１４ｅ）を前後方向内側に折り返した下部折り返し部（１４ｈ）とを備え、前記衝撃吸収部材接続部（Ｂ１）は少なくとも車幅方向内側の締結点（３５）および車幅方向外側の締結点（３５）で前記衝撃吸収部材（１２）の本体部（３３ａ′）に締結され、前記上部折り返し部（１４ｇ）および前記下部折り返し部（１４ｈ）の車幅方向外端は前記車幅方向内側の締結点（３５）の近傍を終端とすることを特徴とする、請求項５に記載の自動車用バンパー。 The bumper beam (11) includes an upper folded portion (14g) formed by folding the upper flange (14d) inward in the front-rear direction and a lower folded portion (14h) formed by folding the lower flange (14e) in the longitudinal direction. The absorbing member connecting portion (B1) is fastened to the main body (33a ') of the shock absorbing member (12) at least at the fastening point (35) on the inner side in the vehicle width direction and the fastening point (35) on the outer side in the vehicle width direction. The outer end in the vehicle width direction of the upper folded portion (14g) and the lower folded portion (14h) is terminated in the vicinity of the fastening point (35) on the inner side in the vehicle width direction. Car bumpers.
PCT/JP2014/079328 2013-11-27 2014-11-05 Automobile bumper WO2015079876A1 (en)

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