WO2014109128A1 - Structure de poutre de pare-chocs pour automobile - Google Patents

Structure de poutre de pare-chocs pour automobile Download PDF

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Publication number
WO2014109128A1
WO2014109128A1 PCT/JP2013/080902 JP2013080902W WO2014109128A1 WO 2014109128 A1 WO2014109128 A1 WO 2014109128A1 JP 2013080902 W JP2013080902 W JP 2013080902W WO 2014109128 A1 WO2014109128 A1 WO 2014109128A1
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WO
WIPO (PCT)
Prior art keywords
bumper beam
reinforced resin
fiber reinforced
resin layer
width direction
Prior art date
Application number
PCT/JP2013/080902
Other languages
English (en)
Japanese (ja)
Inventor
朋也 彌武
重人 安原
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 JP2014556334A priority Critical patent/JP5995115B2/ja
Publication of WO2014109128A1 publication Critical patent/WO2014109128A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
    • B60R19/02—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
    • B60R19/18—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
    • 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
    • B60R2019/186—Additional energy absorbing means supported on bumber beams, e.g. cellular structures or material
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D25/00—Superstructure or monocoque structure sub-units; Parts or details thereof not otherwise provided for
    • B62D25/08—Front or rear portions
    • B62D25/082—Engine compartments

Definitions

  • the present invention relates to an automobile including a continuous fiber reinforced resin layer in which a bumper beam having a certain height in the vehicle width direction is formed from a prepreg having at least a first continuous fiber oriented in the vehicle width direction as a reinforcing material. Bumper beam structure.
  • Patent Document 1 discloses that a bumper beam made of a fiber reinforced resin having a W-shaped cross section is formed by pressing in the shape of the W-shaped cross section is constant in the vehicle width direction of the bumper beam. is there.
  • both ends of the bumper beam in the vehicle width direction are curved inward in the front-rear direction, it is not only aesthetically pleasing, but the end of the bumper beam becomes an obstacle when turning in a narrow place.
  • Patent Document 1 has a problem that the above request cannot be satisfied because the sectional shape of the bumper beam is constant in the vehicle width direction. Also, if the cross-sectional shape of the bumper beam is changed in the vehicle width direction, the shape of the material to be pressed with the die is not a simple rectangle, which causes a problem that the yield of the material is deteriorated and the cost is increased. .
  • the present invention has been made in view of the above circumstances, and an object thereof is to increase the yield of a prepreg for press-molding a bumper beam while changing the cross-sectional shape of the bumper beam in the vehicle width direction.
  • a bumper beam having a certain height in the vehicle width direction is formed from a prepreg having at least a first continuous fiber oriented in the vehicle width direction as a reinforcing material.
  • a bumper beam structure for an automobile provided with a continuous fiber reinforced resin layer, wherein the bumper beam has a groove-type cross section in which an upper wall, a bottom wall, and a lower wall are continuously opened outward in the front-rear direction.
  • the width in the vertical direction of the mold section is wider at both ends in the vehicle width direction than the center in the vehicle width direction, and the depth in the longitudinal direction of the groove section is compared with the center in the vehicle width direction at both ends in the vehicle width direction.
  • a bumper beam structure for automobiles is proposed, which is characterized by being shallow and shallow.
  • the continuous fiber reinforced resin layer includes a second continuous fiber oriented in a direction orthogonal to the first continuous fiber as a reinforcing material.
  • a bumper beam structure for an automobile having the second feature is proposed.
  • the third wall is formed by connecting the upper wall, the bottom wall, and the lower wall of the groove-shaped cross-section with the vertical ribs made of discontinuous fiber reinforced resin.
  • a bumper beam for an automobile according to the fourth feature is that a notch that opens outward in the front-rear direction is formed in the vertical middle portion of the vertical rib. A structure is proposed.
  • a fifth feature is that the bottom wall of the groove-shaped cross-section is fixed to the outer end in the front-rear direction of the bumper beam extension.
  • the bumper beam includes a single groove-shaped cross section, and the continuous fiber reinforced resin layer includes continuous fibers laminated in at least two layers,
  • a bumper beam structure for automobiles is proposed in which the upper wall, the bottom wall, and the lower wall of the groove-shaped cross section are connected by vertical ribs made of discontinuous fiber reinforced resin.
  • the bumper beam includes two upper and lower groove-shaped cross-sections, and each of the groove-shaped cross-sections includes a fixing portion for a bumper beam extension,
  • a bumper beam structure for automobiles is proposed, characterized in that a vertical rib made of discontinuous fiber reinforced resin that connects the upper wall, the bottom wall, and the lower wall is provided.
  • the bumper beam is fixed to the vehicle body at a center portion located in the center of the vehicle width direction and on both sides of the center portion in the vehicle width direction.
  • a continuous fiber reinforced resin layer that is press-molded and includes a discontinuous fiber reinforced resin layer that covers the surface of the continuous fiber reinforced resin layer, and the continuous fiber reinforced resin layer includes the central portion and the two vehicle body fixed portions.
  • An automobile bumper beam structure characterized by comprising a fiber reinforced resin layer is proposed.
  • the bumper beam has a groove-type cross-section having an upper wall, a bottom wall, and a lower wall and opening outward in the vehicle width direction.
  • a bumper beam structure for automobiles is proposed, wherein the continuous fiber reinforced resin layer includes vertical ribs connecting the upper wall, the bottom wall, and the lower wall.
  • a bumper beam for an automobile according to the tenth feature is that, in addition to the ninth feature, a notch that is open toward the outside in the front-rear direction is formed at an intermediate portion in the vertical direction of the vertical rib. A structure is proposed.
  • the vehicle body fixing portion includes a plurality of fastening portions fastened to a bumper beam extension, and the fastening portion is a bottom wall of the groove-type cross-sectional portion.
  • An automobile bumper beam structure is proposed, which is characterized in that it is formed as follows.
  • a bumper beam structure for an automobile according to the twelfth feature, wherein the second continuous fiber reinforced resin layer overlaps the fastening portion at the innermost side in the vehicle width direction. Proposed.
  • the thirteenth feature is that the vehicle body fixing portion is fixed to a front and rear outer end of the vehicle body frame via the bumper beam extension.
  • a bumper beam structure for automobiles is proposed.
  • the fourteenth aspect is that the initial load absorbing member is coupled to the outer end in the front-rear direction of the groove-shaped cross section to form a closed cross section.
  • a bumper beam structure for automobiles is proposed.
  • the first continuous fiber reinforced resin layer and the second continuous fiber reinforced resin layer may be arranged in two directions perpendicular to each other.
  • a bumper beam structure for automobiles is proposed, which is characterized by containing oriented continuous fibers.
  • the second continuous fiber reinforced resin layer has a shorter central portion in the vehicle width direction than the second continuous fiber reinforced resin layer.
  • a bumper beam structure for automobiles is proposed, characterized in that a third continuous fiber reinforced resin layer is laminated in the vehicle width direction dimension.
  • the front side frame front portion 14 of the embodiment corresponds to the vehicle body frame of the present invention
  • the first and second bosses 33h and 33i of the embodiment correspond to the boss or fastening portion of the present invention.
  • the first and second continuous fiber reinforced resin layers 53A and 53B correspond to the continuous fiber reinforced resin layer of the present invention
  • the second and third prepregs 59 and 60 of the embodiment correspond to the prepreg of the present invention.
  • the first continuous fibers 62 and the second continuous fibers 63 in the form correspond to the continuous fibers of the present invention.
  • the bumper beam since the bumper beam has a certain height in the vehicle width direction, the arrangement of the headlight and the like is not hindered by interference with the bumper beam.
  • the continuous fiber reinforced resin layer includes the first continuous fiber oriented in the vehicle width direction as a reinforcing material, the strength of the bumper beam against the collision load can be ensured.
  • the bumper beam also has a groove-shaped cross section where the top wall, bottom wall and lower wall are continuously opened outward in the front-rear direction, and the vertical width of the groove-shaped cross section is centered in the vehicle width direction at both ends in the vehicle width direction. The depth in the longitudinal direction of the cross section of the groove mold is shallower than the central side in the vehicle width direction at both ends in the vehicle width direction.
  • the continuous fiber reinforced resin layer includes the second continuous fiber oriented in a direction orthogonal to the first continuous fiber as a reinforcing material, the second continuous fiber
  • the bending strength of the bumper beam can be further increased by the fiber.
  • the continuous fiber reinforced resin layer is difficult to extend in the direction (vertical direction and front-rear direction) perpendicular to the first continuous fiber, but the vertical width and front-rear direction of the groove-shaped cross-section By making the direction depth wider and shallower at both ends in the vehicle width direction than the center side in the vehicle width direction, it is not necessary to stretch the continuous fiber reinforced resin layer in the vertical direction and the front-rear direction, making it easier to form the bumper beam .
  • the groove type cross section is It is possible to increase the torsional strength of the bumper beam while minimizing the increase in weight while preventing the mouth from opening and improving the shock absorbing performance.
  • the discontinuous fibers are reliably filled in the entire length of the vertical rib. Can be increased.
  • the bottom wall of the groove-shaped cross section is fixed to the outer end in the front-rear direction of the bumper beam extension, not only the bumper beam can be easily fixed to the bumper beam extension but also the bumper beam extension.
  • the collision load input to the beam can be reliably transmitted to the bumper beam extension.
  • the bumper beam has a single groove-shaped cross section
  • the continuous fiber reinforced resin layer includes continuous fibers laminated in at least two layers, and the upper wall of the groove-shaped cross section. Since the bottom wall and the lower wall are connected by vertical ribs made of discontinuous fiber reinforced resin, it is possible to suppress the delamination of two layers of continuous fibers by the vertical ribs when a collision load is input, and to improve the shock absorption performance it can.
  • the bumper beam has two upper and lower groove-shaped cross sections, each of which has a fixing portion for the bumper beam extension, an upper wall, a bottom wall, and a lower wall. Since there is a vertical rib made of discontinuous fiber reinforced resin that connects the two, the vertical rib exists between the upper and lower channel sections when the impact load of offset collision is input to the end in the vehicle width direction. Therefore, the upper and lower two groove-type cross-sectional portions are deformed so that the fixed portion is broken and expanded in the vertical direction. As a result, the bumper beam gradually absorbs the impact by increasing the pressure receiving load and absorbs the impact, and the vehicle width direction end portion where the collision load is input and the vehicle width direction center portion where the collision load is not input are separated. In this way, it is possible to absorb the shock further.
  • the bumper beam includes a central portion located in the center in the vehicle width direction, and two vehicle body fixing portions located on both sides in the vehicle width direction of the central portion and fixed to the vehicle body. And a discontinuous fiber reinforced resin layer covering the surface of the continuous fiber reinforced resin layer.
  • the continuous fiber reinforced resin layer includes a first continuous fiber reinforced resin layer constituting a central portion and two vehicle body fixing portions, and a first continuous fiber reinforced resin layer having a shorter dimension in the vehicle width direction than the first continuous fiber reinforced resin layer.
  • the second continuous fiber reinforced resin layer that is laminated to form the central portion so that the thickness of the continuous fiber reinforced resin layer of the bumper beam can be easily changed at the central portion and the vehicle body fixing portion,
  • By covering and smoothing the step at the end of the second continuous fiber reinforced resin layer with the discontinuous fiber reinforced resin layer it is possible to easily obtain a bumper beam whose strength gradually decreases from the central portion toward the vehicle body fixing portion.
  • the bending strength at the center where the largest bending moment is applied is maximized, and then the bending strength is gradually reduced toward the vehicle body fixing portions on both sides in the vehicle width direction. Therefore, it is not necessary to discontinuously dispose continuous fibers over the entire length of the bumper beam, thereby reducing costs and weight.
  • the bumper beam has a groove-shaped cross section having an upper wall, a bottom wall, and a lower wall and opening outward in the vehicle width direction.
  • the groove-shaped cross-section is prevented from opening when a collision load is input, improving shock absorption performance and minimizing weight increase
  • the torsional strength of the bumper beam can be increased.
  • the discontinuous fibers are reliably filled in the entire vertical rib to ensure strength. Can be increased.
  • the vehicle body fixing portion includes a plurality of fastening portions fastened to the bumper beam extension, and the fastening portion is formed on the bottom wall of the groove-type cross section.
  • the collision load input to the bumper beam can be reliably transmitted to the bumper beam extension.
  • the collision load input to the central portion of the bumper beam is applied to the second continuous fiber reinforced resin layer. It is possible to efficiently transmit from the fastening part to the bumper beam extension via the bump and absorb it with the bumper beam extension.
  • the strength of the vehicle body fixing portion is set to the central portion by the strength of the bumper beam extension. Can be lower.
  • the bumper is reduced in weight while reducing the thickness of the groove-type cross section. The bending strength of the beam can be ensured.
  • the first continuous fiber reinforced resin layer and the second continuous fiber reinforced resin layer include continuous fibers oriented in two directions orthogonal to each other, the bending of the bumper beam The strength can be further increased.
  • the third continuous fiber reinforced resin layer has a vehicle width direction dimension shorter than that of the second continuous fiber reinforced resin layer at the center in the vehicle width direction of the second continuous fiber reinforced resin layer.
  • FIG. 1 is a perspective view of a front part of a vehicle body.
  • FIG. 2 is a view in the direction of the arrow 2 in FIG.
  • FIG. 3 is a perspective view of the bumper beam.
  • FIG. 4 is a view in the direction of arrows 4 in FIG.
  • First embodiment) 5 is a cross-sectional view taken along line 5 (A) -5 (A) and line 5 (B) -5 (B) of FIG.
  • First embodiment) 6 is an enlarged view of a portion 6 in FIG.
  • First embodiment 7 is a cross-sectional view taken along line 7-7 of FIG.
  • First embodiment 8 is a cross-sectional view taken along line 8-8 of FIG. (First embodiment) FIG.
  • FIG. 9 is an exploded perspective view of the bumper beam extension.
  • FIG. 10 is a longitudinal sectional view of a mold for molding a bumper beam.
  • First embodiment 11 is a cross-sectional view taken along line 11-11 in FIG.
  • FIG. 12 corresponds to FIG.
  • (Second Embodiment) 13 is a cross-sectional view taken along line 13 (A) -13 (A) and line 13 (B) -13 (B) of FIG.
  • FIG. 14 is a diagram showing the distribution of bending moment when a collision load is input to the central portion of the bumper beam in the vehicle width direction.
  • FIG. 15 corresponds to FIG. (Third embodiment)
  • the front-rear direction impact load input direction
  • the left-right direction vehicle width direction
  • the up-down direction are defined with reference to the passenger seated in the driver's seat.
  • the vehicle body of the embodiment includes a cabin 11 integrally formed in a bathtub shape with FRP such as CFRP (carbon fiber reinforced resin), and a dash panel 12 standing from its front end.
  • FRP such as CFRP (carbon fiber reinforced resin)
  • a pair of left and right suspension support members 13, 13 that are die-cast with an aluminum alloy are fixed to the front surface.
  • the suspension support members 13 and 13 include damper housings 13a and 13a that support upper ends of suspension dampers (not shown), and front side frame rear portions 13b and 13b that are connected to lower portions of the damper housings 13a and 13a and extend forward.
  • a pair of left and right front side frame front parts 14, 14 made of an aluminum extruded material or a steel plate press material are connected to the front ends of the front side frame rear parts 13b, 13b.
  • a pair of left and right FRP side members 16, 16 are connected to front ends of a pair of left and right FRP upper members 15, 15 extending forward from the left and right upper portions of the dash panel 12.
  • a front bulkhead 17 made of FRP formed in a rectangular frame shape in front view is fixed to the front ends of the front side frame front portions 14, 14, and the front ends of the side members 16, 16 are located on the upper left and right sides of the front bulkhead 17.
  • a pair of left and right FRP bumper beam extensions 18, 18 are fixed to the front ends of the front side frame front portions 14, 14, and an FRP bumper beam 19 extending in the vehicle width direction at the front ends of the bumper beam extensions 18, 18. Is fixed.
  • the front surface of the bumper beam 19 is covered with a bumper face 20.
  • An FRP shroud 21 formed in a rectangular frame shape when viewed from the front is disposed at a position surrounded by the front bulkhead 17, the bumper beam 19, and the pair of left and right bumper beam extensions 18, 18.
  • cooling system components such as an engine cooling radiator, an air conditioning condenser, and a battery cooling radiator are overlapped and supported in the front-rear direction.
  • the bumper beam 19 made of FRP includes a rear main body 31 and front initial load absorbing portions 32.
  • the main body 31 includes a pair of groove-shaped cross-sections 33, 33 that have an upper wall 33a, a lower wall 33b, and a bottom wall 33c and that open toward the front, and an upper flange of the lower groove-shaped cross-section 33.
  • 33d and the lower flange 33e of the upper groove-type cross-sectional portion 33 are integrally continuous to form a substantially W-shaped cross-section.
  • a plurality of vertical ribs 33 f that extend in the vertical direction and connect the upper wall 33 a, the lower wall 33 b, and the bottom wall 33 c are spaced apart from each other by a predetermined distance in the longitudinal direction of the bumper beam 19. It is formed. Except for the vertical ribs 33f at both ends in the vehicle width direction, U-shaped cutouts 33j that open toward the front are formed in the remaining vertical ribs 33f.
  • a plurality of pins 33g... Projecting forward are formed on the upper flange 33d of the upper channel section 33 and the lower flange 33e of the lower channel section 33.
  • a plurality of first bosses 33h projecting forward and a plurality of second bosses 33i projecting forward are formed at both ends in the vehicle width direction of the bottom wall 33c of each groove section 33.
  • the fastening collars 34 which are oriented in the front-rear direction, are inserted into the first and second bosses 33h, 33i,.
  • the bumper beam 19 is integrally provided with a central portion 31a located at the center in the vehicle width direction and a pair of vehicle body fixing portions 31b and 31b connected to both sides of the central portion 31a.
  • the fastening collars 34 are provided on each of the vehicle body fixing portions 31b in three upper and lower portions.
  • the cross-sectional shape of the groove-type cross-sectional portion 33 is substantially constant in the vehicle width direction throughout the central portion 31a, but the cross-sectional shape of the groove-type cross-sectional portion 33 changes in the vehicle width direction in the vehicle body fixing portion 31b (see FIG. 5). . That is, the vertical width W of the U-shaped groove of the groove-shaped cross section 33 gradually increases toward the outer side in the vehicle width direction, and the longitudinal depth D of the U-shaped groove of the groove-shaped cross section 33 is the vehicle width. It becomes gradually smaller toward the outside in the direction. As a result, the developed length of the cross section of the main body 31 of the bumper beam 19, that is, the length obtained by extending the W shape of the cross section in the vertical direction is substantially constant over the entire lengthwise direction of the bumper beam 19.
  • the initial load absorbing portion 32 is divided into three in the longitudinal direction of the bumper beam 19, and each has substantially the same structure.
  • Each initial load absorbing portion 32 includes a flat connecting wall 32a, and a plurality of vertical ribs 32b and a plurality of horizontal ribs 32c formed on the front surface of the connecting wall 32a.
  • the vertical ribs 32b extending in the vertical direction and the horizontal ribs 32c extending in the left-right direction intersect with each other in a lattice shape.
  • Pin holes 32d, into which the pins 33g of the main body 31 can be fitted, are formed on the upper and lower edges of the connecting wall 32a.
  • the initial load absorbing portion 32 is coupled to the main body portion 31 by fitting the pins 33g of the main body portion 31 into the pin holes 32d of the initial load absorbing portion 32 and melting the pins 33g with a vibration tool.
  • a mold 55 for press-molding the main body 31 of the bumper beam 19 includes a female mold 56 having a concave cavity 56 a for molding the outer surface of the main body 31, and the main body 31. It comprises a male mold 57 having a convex core 57a for molding the inner surface, and grooves 56b, 57b,... For molding ribs and bosses are formed in the cavity 56a and the core 57a.
  • the first prepreg 58 of the discontinuous fiber reinforced resin, the second prepreg 59 and the third prepreg 60 of the continuous fiber reinforced resin, and the discontinuous fibers are formed above the cavity 56a of the female mold 56.
  • the fourth prepreg 61 of reinforced resin is arranged in a preheated state.
  • the second and third prepregs 59 and 60 are made of carbon fiber continuous fiber UD (sheets in which continuous fibers are aligned in one direction) laminated in two layers in directions of 0 ° and 90 ° as reinforcing materials
  • the first and fourth prepregs 58 and 61 are made of a carbon fiber discontinuous fiber mat as a reinforcing material, and are impregnated with a thermoplastic resin (nylon 6, nylon 66, polypropylene, or the like).
  • the preheated first to fourth prepregs 58 to 61 are inserted into the mold 55 in a laminated state and subjected to pressure molding, and then cooled to obtain a fiber reinforced resin product.
  • the second and third prepregs 59 and 60 are pressed by the cavity 56a of the female mold 56 and the core 57a of the male mold 57, and the main body 31 is molded.
  • the first and fourth prepregs 58 and 61 using discontinuous fibers as reinforcing materials can be easily deformed, they are sandwiched between the second and third prepregs 59 and 60 and the cavity 56a of the female die 56.
  • the first prepreg 58 flows into the grooves 56b of the cavity 56a, and simultaneously molds the second bosses 33i on the outer surface of the main body 31, and a part of the outer surface of the main body 31 (of the groove-type cross section 33).
  • a thin film is laminated along the rear surface of the bottom wall 33c.
  • the fourth prepreg 61 sandwiched between the second and third prepregs 59 and 60 and the core 57a of the male mold 57 flows into the grooves 57b of the core 57a, and the longitudinal ribs 33f on the inner surface of the main body 31 are formed.
  • pins 33g ... and first bosses 33h ... are simultaneously molded and laminated in a thin film shape along the inner surface of the inner surface of the main body 31.
  • the main-body part 31 is completed by cut
  • the cross-sectional structure of the central portion 31a of the body portion 31 of the bumper beam 19 formed in this way is the first continuous fiber reinforced resin layer 53A and the second continuous fiber reinforced formed from the second and third prepregs 59 and 60.
  • a discontinuous fiber reinforced resin layer 54 formed from the fourth prepreg 61 is laminated on the front surface of the resin layer 53B, and a discontinuous fiber reinforced resin layer 54 formed from the first prepreg 58 is laminated on the rear surface thereof. (See FIG. 5A).
  • the cross-sectional structure of the vehicle body fixing portions 31b and 31b of the main body portion 31 of the bumper beam 19 does not include the second continuous fiber reinforced resin layer 53B formed from the third prepreg 60, and thus is formed from the second prepreg 59.
  • Discontinuous fiber reinforced resin layers 54 and 54 are laminated on the front and rear surfaces of the first continuous fiber reinforced resin layer 53A (see FIG. 5B).
  • the first continuous fibers out of the first continuous fibers 62 and the second continuous fibers 63 of the first and second continuous fiber reinforced resin layers 53A and 53B. 62 are oriented in the vehicle width direction, and the second continuous fibers 63 are oriented in the front-rear direction or the vertical direction. Further, the discontinuous fibers 64 of the discontinuous fiber reinforced resin layers 54, 54 are intertwined randomly.
  • a continuous fiber reinforced resin having a long fiber UD as a reinforcing material has a relatively high strength, but due to the limited amount of deformation of the UD, the moldability is low, and thin and high ribs and pins are formed. Have difficulty.
  • discontinuous fiber reinforced resin that has short fibers that are randomly intertwined as a reinforcing material has a relatively low strength, but because the fibers are easily deformed, the moldability is high, and thin and high ribs and pins are formed. Easy to do. Therefore, by laminating the discontinuous fiber reinforced resin on the continuous fiber reinforced resin and molding the main body 31, the strength and moldability of the main body 31 can be compatible.
  • the bumper beam extension 18 is configured by connecting an upper member 51 and a lower member 52. Since the upper member 51 and the lower member 52 of the bumper beam extension 18 have a substantially plane symmetrical structure, the structure will be described below with the upper member 51 as a representative.
  • the upper member 51 includes an inner continuous fiber reinforced resin layer 53 and discontinuous fiber reinforced resin layers 54 and 54 laminated on both sides thereof.
  • the upper member 51 having such a structure is press-molded in the same manner as the main body 31 of the bumper beam 19 described with reference to FIGS.
  • the upper member 51 includes a main body 51a, a front fastening flange 51b that bends upward from the front edge of the main body 51a, a rear fastening flange 51c that is bent upward from the rear edge of the main body 51a, and a vehicle on the inner surface of the main body 51a.
  • Four joint portions 51d to 51g extending in the front-rear direction at positions separated in the width direction are provided.
  • First reinforcing ribs 51h that intersect in three directions at intervals of 60 ° are formed of discontinuous fiber reinforced resin on the inner surface between the two joining portions 51d and 51e (the same shape and arrangement as the first reinforcing ribs 52h in FIG. 9).
  • Six second reinforcing ribs 51i that extend in the front-rear direction and connect the front fastening flange 51b and the rear fastening flange 51c are formed of discontinuous fiber reinforced resin on the outer surface of the main body 51a. Further, three nuts 65 are inserted in the front fastening flange 51b of the discontinuous fiber reinforced resin, and three fastening holes 51j are formed in the rear fastening flange 51c of the discontinuous fiber reinforced resin.
  • the lower member 52 Since the lower member 52 has the same shape that is substantially plane-symmetric with the upper member 51 described above, the same subscript as the subscript of each part of the upper member 51 is added to the reference numeral 52 of the lower member 52 so as to overlap. Description is omitted.
  • the only difference between the upper member 51 and the lower member 52 is that the lower member 52 includes a plurality of pins 52k that protrude upward from the four joints 52d to 52g, whereas the upper member 51 includes the pins 52k. It is a point provided with the several pin hole 51m ... which can be fitted (refer FIG. 9).
  • the main closed cross section 22 of the bumper beam extension 18 is formed by vertically coupling the main impact absorbing sections 18a and 18a having a rectangular cross section of the upper member 51 and the lower member 52.
  • the first sub-closed cross-section portion 23 and the second sub-closed cross-section portion 24 of the bumper beam extension 18 are composed of a first sub-impact absorbing portion in which the upper member 51 and the lower member 52 form a groove shape having a circular arc cross section.
  • 18b, 18b and the second sub-impact absorbers 18c, 18c are connected vertically.
  • the main closed cross-section 22 of the bumper beam extension 18 has a three-layer structure in which discontinuous fiber reinforced resin layers 54 and 54 are laminated on both upper and lower surfaces of the continuous fiber reinforced resin layer 53.
  • the first sub-closed section 23 and the second sub-closed section 24 of the bumper beam extension 18 have a two-layer structure in which the discontinuous fiber reinforced resin layer 54 is laminated only on one side of the continuous fiber reinforced resin layer 53.
  • the upper member 51 and the lower member 52 having the above-described shapes are configured such that the pins 52k of the lower member 52 are fitted into the pin holes 51m of the upper member 51 so that the joint portions 51d to 51g and 52d to 52g are brought into contact with each other.
  • the tips of the pins 52k... Are melted together by a vibrating tool from the upper member 51 side (see FIG. 8).
  • the rear fastening flanges 51c and 52c of the upper member 51 and the lower member 52 are linearly aligned in the vertical direction, but the front fastening flanges 51b and 52b of the upper member 51 and the lower member 52 are tilted forward. (See FIG. 7).
  • a mounting plate 81 made of a metal plate is welded to the front end of the front side frame front portion 14, and a bracing member 82 made of a metal plate is attached to the vehicle width direction outer end of the mounting plate 81 and the vehicle width direction outer surface of the front side frame front portion 14. Are welded. Then, six bolts 83 that pass through the rear fastening flanges 51c and 52c of the bumper beam extension 18 from front to rear are screwed into weld nuts 84 provided on the rear surface of the mounting plate 81, so that the bumper beam extension 18 and the front are fixed. The bulkhead 17 is fastened together with the mounting plate 81.
  • bolts 85 penetrating through the fastening collars 34 inserted into the main body 31 of the bumper beam 19 from the front to the rear are screwed into nuts 65 inserted into the front fastening flanges 51 b and 52 b of the bumper beam extension 18.
  • the bumper beam 19 is fastened to the front ends of the bumper beam extensions 18 and 18.
  • the longitudinal ribs 32b and the lateral ribs 32c of the initial load absorbing parts 32 are crushed and exhibit shock absorbing performance.
  • the main body 31 of the bumper beam 19 and the bumper beam extension 18 are crushed and exhibit shock absorbing performance.
  • the initial load absorbing members 32 are coupled to the front ends of the groove-type cross-sections 33, 33 of the main body 31 to make a closed cross-section, the thickness of the groove-type cross-sections 33, 33 is reduced while reducing the weight. The bending strength of the bumper beam 19 can be ensured.
  • the bumper beam 19 Since the bumper beam 19 has a certain height in the vehicle width direction, the arrangement of headlights and the like is not hindered by interference with the bumper beam 19. Further, since the first and second continuous fiber reinforced resin layers 53A and 53B of the main body 31 of the bumper beam 19 include the first continuous fibers 62... Oriented in the vehicle width direction as a reinforcing material (see FIG. 3), a collision occurs. The strength of the bumper beam 19 against the load can be ensured. Moreover, the first and second continuous fiber reinforced resin layers 53A and 53B are made of reinforcing material of the second continuous fibers 63 oriented in the direction orthogonal to the first continuous fibers 62 oriented in the vehicle width direction. (See FIG. 3), the bending strength of the bumper beam 19 can be further increased by the second continuous fibers 63.
  • the main body 31 of the bumper beam 19 is provided with two upper and lower groove-type cross-sections 33, 33 in which an upper wall 33a, a bottom wall 33c, and a lower wall 33b are continuously opened forward.
  • the width W in the vertical direction is made wider at both ends in the vehicle width direction than the center side in the vehicle width direction, and the depth D in the front-rear direction of each groove-shaped cross section 3 is compared with the center side in the vehicle width direction at both ends in the vehicle width direction. 5 (see FIG. 5), the development length in the vertical direction of the cross-sectional shape of the main body 31 becomes constant at each position in the vehicle width direction, and the bumper beams are formed from the rectangular second and third prepregs 59 and 60. 19 main body portions 31 can be formed, the yield of the second and third prepregs 59 and 60 can be improved, and the cost can be reduced.
  • the first and second continuous fiber reinforced resin layers 53A and 53B are less likely to extend in the direction (vertical direction and front-rear direction) perpendicular to the first continuous fibers 62.
  • the vertical width W and the longitudinal depth D of the groove cross sections 33, 33 are wider and shallower at both ends in the vehicle width direction than at the vehicle width direction center, It is not necessary to stretch the first and second continuous fiber reinforced resin layers 53A and 53B in the vertical direction and the front-rear direction, and the bumper beam 19 can be easily molded.
  • the both ends of the bumper beam 19 in the vehicle width direction can be rounded to enhance the aesthetics, and when turning in a narrow place The both ends of the bumper beam 19 in the vehicle width direction can be made difficult to contact an obstacle.
  • the groove-shaped cross-section 33 opens when a collision load is input. It is possible to increase the torsional strength of the bumper beam 19 while minimizing the increase in weight and minimizing the increase in weight.
  • the notches 33j that are opened forward are formed in the middle portion in the vertical direction of the vertical ribs 33f, the discontinuous fibers 64 are reliably filled into the entire vertical ribs 33f at the time of press molding. Can be increased.
  • the bottom wall 33c of the groove-shaped cross section 33 is fixed to the front fastening flanges 51b and 52b of the bumper beam extension 18, not only the bumper beam 19 can be easily fixed to the bumper beam extension 18, but also the bumper beam 19 The input collision load can be reliably transmitted to the bumper beam extension 18.
  • the bumper beam 19 includes two upper and lower groove-shaped cross-sections 33, 33, and each groove-shaped cross-section 33 includes first and second bosses 33h, 33i, which are fixing portions with respect to the bumper beam extension 18. Since the vertical ribs 33f made of discontinuous fiber reinforced resin that connect the upper wall 33a, the bottom wall 33c, and the lower wall 33b are provided, when a collision load of an offset collision is input to the end in the vehicle width direction of the bumper beam 19 In addition, since there are no vertical ribs 33f between the rear surfaces of the upper and lower two groove-type cross-sections 33, 33, the upper and lower two groove-type cross-sections 33, 33 have first and second bosses 33h, 33i,.
  • the body portion 31 of the bumper beam 19 absorbs shock by sequentially breaking from the end while increasing the pressure receiving load, and the vehicle width direction end where the collision load is input and the vehicle width direction center where the collision load is not input It is possible to absorb further shocks by breaking the parts apart.
  • the main body 31 of the bumper beam 19 is laminated on the first continuous fiber reinforced resin layer 53A and the first continuous fiber reinforced resin layer 53A constituting the central portion 31a and the vehicle body fixing portions 31b and 31b, thereby forming the central portion 31a. Since the second continuous fiber reinforced resin layer 51B is formed, the thickness of the continuous fiber reinforced resin layer of the main body 31 can be easily changed by the central portion 31a and the vehicle body fixing portions 31b and 31b. By covering the level difference at the end of the continuous fiber reinforced resin layer 53B with the discontinuous fiber reinforced resin layer 54 and smoothing it, the bumper beam 19 whose strength gradually decreases from the central portion 31a toward the vehicle body fixing portions 31b and 31b can be easily obtained. (See FIG. 4).
  • the second continuous fiber reinforced resin layer 53B overlaps the first and second bosses 33h and 33i on the innermost side in the vehicle width direction, that is, the outer end in the vehicle width direction of the second continuous fiber reinforced resin layer 53B is the most in the vehicle width direction. Since it extends further to the outside in the vehicle width direction than the inner first and second bosses 33h and 33i (see FIG. 4), the collision load input to the central portion of the bumper beam 19 is passed through the second continuous fiber reinforced resin layer 53B. It is possible to efficiently transmit to the bumper beam extension 18 from the first and second bosses 33h and 33i on the innermost side in the vehicle width direction, and to be absorbed by the bumper beam extension 18.
  • the vehicle body fixing portions 31b and 31b do not have the second continuous fiber reinforced resin layer 53B, the strength is lower than that of the central portion 31a having the second continuous fiber reinforced resin layer 53B, but the vehicle body fixing portions 31b and 31b are bumpers. Since it is fixed to the front side frame front portions 14 and 14 via the beam extensions 18 and 18, the vehicle body fixing portions 31b and 31b are reinforced by the bumper beam extensions 18 and 18, and the strength of the bumper beam 19 is made uniform in the vehicle width direction. Can be
  • the main body 31 of the bumper beam 19 according to the first embodiment forms a W-shaped cross section by vertically connecting two groove-shaped cross-sections 33, 33 having a U-shaped cross section.
  • the main body 31 of the bumper beam 19 according to the second embodiment includes one groove-type cross-sectional portion 33 having a U-shaped cross section.
  • the cross-sectional structure of the main body 31 is the same as that of the first embodiment.
  • the first and second continuous fiber reinforced resin layers 53A, Discontinuous fiber reinforced resin layers 54 and 54 are laminated on both sides of 53B.
  • discontinuous fiber reinforced resin layers 54 and 54 are laminated on both surfaces of the first and second continuous fiber reinforced resin layers 53A and 53B.
  • the second continuous fiber reinforced resin layer 53B is not provided, and the discontinuous fiber reinforced resin layers 54 and 54 are laminated on both surfaces of the first continuous fiber reinforced resin layer 53A.
  • Only the vertical ribs 33f are formed on the inner surface of the groove-type cross section 33 of the first embodiment.
  • the inner surfaces of the groove-type cross section 33 of the second embodiment are orthogonal to the vertical ribs 33f.
  • a lateral rib 33k extending in the vehicle width direction is formed.
  • the cross-sectional shape of the groove-type cross-sectional portion 33 is substantially constant in the vehicle width direction in the entire region of the central portion 31a of the main body portion 31.
  • the vertical width W of the groove-shaped cross-section 33 gradually increases toward the vehicle width direction outer side, and the front-rear direction depth D gradually decreases toward the vehicle width direction outer side.
  • the developed length of the cross section of the main body 31 of the bumper beam 19, that is, the length obtained by extending the U shape of the cross section in the vertical direction is substantially constant over the entire lengthwise direction of the bumper beam 19.
  • each of the first continuous fiber reinforced resin layer 53A and the second continuous fiber reinforced resin layer 53B of the groove-shaped cross-section 33 includes continuous fibers laminated in at least two layers, and includes an upper wall 33a, a bottom wall 33c, and a lower wall. Since 33b is connected by the longitudinal ribs 33f made of discontinuous fibers, it is possible to improve the shock absorbing performance by suppressing the delamination of the two continuous fibers by the longitudinal ribs 33f when the collision load is input.
  • the vehicle body fixing portions 31b and 31b have a one-layer structure of the first continuous fiber reinforced resin layer 53A, and the central portion 31a has the first continuous fiber reinforced resin layer 53A and the second continuous fiber reinforced resin layer 53A.
  • the fiber reinforced resin layer 53B has a two-layer structure, as shown in FIG. 15, the bumper beam 19 of the third embodiment is formed at the central portion of the front surface of the second continuous fiber reinforced resin layer 53B in the central portion 31a.
  • the third continuous fiber reinforced resin layer 53C is laminated to form a three-layer structure.
  • the first continuous fiber reinforced resin layer 53A has the longest vehicle width direction dimension
  • the second continuous fiber reinforced resin layer 53B has the longest vehicle width direction dimension
  • the third continuous fiber reinforced resin layer 53C has the shortest vehicle width direction dimension.
  • FIG. 14 shows the distribution of the bending moment when the bumper beam 19 is regarded as a beam having both ends fixed in the vehicle width direction and a load is applied to the center in the vehicle width direction.
  • the distribution of the bending moment of the bumper beam 19 becomes maximum at the center in the vehicle width direction and gradually decreases from there toward both ends in the vehicle width direction. Therefore, the third continuous fiber reinforced resin layer 53C is laminated at the vehicle width direction central portion of the bumper beam 19 to form a three-layer structure, so that the bending strength is maximized, and from there, two layers toward both ends in the vehicle width direction.
  • the bumper beam extension and bumper beam of the present invention are not limited to those on the front side of the automobile, but may be those on the rear side.
  • the fiber reinforced resin of the present invention is not limited to the CFRP (carbon fiber reinforced resin) of the embodiment, and may be a glass fiber reinforced resin, an aramid fiber reinforced resin, or the like.
  • vehicle body frame of the present invention is not limited to the front side frame front portion 14 of the embodiment, and may be a frame arranged in the front-rear direction at the vehicle body front portion or the vehicle body rear portion.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Body Structure For Vehicles (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Abstract

La présente invention concerne une poutre de pare-chocs (19) qui comprend des parties à section transversale en forme de rainure (33) une paroi supérieure (33a), une paroi de fond (33c) et une paroi inférieure (33b) s'ouvrant en continu vers l'extérieur dans la direction avant-arrière. Du fait que la largeur (W) des parties à section transversale en forme de rainure (33) dans la direction verticale est établie de façon à être plus large au niveau de l'une ou l'autre extrémité, dans le sens de la largeur de la voiture, qu'au niveau du côté central dans le sens de la largeur de la voiture et que la profondeur (D) des parties à section transversale en forme de rainure (33) dans la direction avant-arrière est établie de façon à être moins profonde au niveau de l'une ou l'autre extrémité, dans le sens de la largeur de la voiture, qu'au niveau du côté central dans le sens de la largeur de la voiture, la longueur dépliée de la forme à section transversale de la poutre de pare-chocs (19) devient constante au niveau de positions respectives dans le sens de la largeur de la voiture. A ce titre, la poutre de pare-chocs (19) peut être formée à partir d'un pré-imprégné rectangulaire, de sorte que le rendement du pré-imprégné (59) soit amélioré et que le coût puisse ainsi être réduit. En outre, du fait que les dimensions de la poutre de pare-chocs (19) dans la direction avant-arrière sont réduites au niveau de l'une ou l'autre extrémité dans le sens de la largeur de la voiture, les extrémités de la poutre de pare-chocs (19) dans le sens de la largeur de la voiture peuvent être rendues moins susceptibles de venir en contact avec un obstacle lorsque la voiture effectue un virage dans un espace étroit.
PCT/JP2013/080902 2013-01-11 2013-11-15 Structure de poutre de pare-chocs pour automobile WO2014109128A1 (fr)

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JP2013-003481 2013-01-11
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Cited By (5)

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Publication number Priority date Publication date Assignee Title
GB2529299A (en) * 2014-07-04 2016-02-17 Gm Global Tech Operations Inc Bumper structure for a motor vehicle
US9533712B2 (en) * 2014-10-20 2017-01-03 GM Global Technology Operations LLC Wheel catcher assembly
JP2018172116A (ja) * 2017-03-31 2018-11-08 アイシン テクニカル センター オブ アメリカ インコーポレイテッドＡｉｓｉｎ Ｔｅｃｈｎｉｃａｌ Ｃｅｎｔｅｒ Ｏｆ Ａｍｅｒｉｃａ，Ｉｎｃ． 車両のためのハイブリッド・バンパー・ビーム、および、それを製造するための方法
CN112406759A (zh) * 2020-12-23 2021-02-26 湖州力椿汽车零部件有限公司 一种多级缓冲轻量化保险杠
FR3132887A1 (fr) * 2022-02-18 2023-08-25 Valeo Systemes Thermiques Poutre de pare-chocs pour véhicule automobile

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JPH0292756A (ja) * 1988-09-28 1990-04-03 Kuraray Co Ltd バンパービーム
JPH04107148U (ja) * 1991-02-28 1992-09-16 いすゞ自動車株式会社 自動車のバンパービーム構造
JPH0532143A (ja) * 1991-07-30 1993-02-09 Nishikawa Kasei Co Ltd 車両用補強材およびその製造方法
JP2002036983A (ja) * 2000-05-19 2002-02-06 Sumitomo Chem Co Ltd バンパ補強部材
JP2007038756A (ja) * 2005-08-01 2007-02-15 Toyoda Iron Works Co Ltd 自動車用バンパービーム
JP2010047077A (ja) * 2008-08-20 2010-03-04 Mazda Motor Corp 車両のバンパー構造

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0292756A (ja) * 1988-09-28 1990-04-03 Kuraray Co Ltd バンパービーム
JPH04107148U (ja) * 1991-02-28 1992-09-16 いすゞ自動車株式会社 自動車のバンパービーム構造
JPH0532143A (ja) * 1991-07-30 1993-02-09 Nishikawa Kasei Co Ltd 車両用補強材およびその製造方法
JP2002036983A (ja) * 2000-05-19 2002-02-06 Sumitomo Chem Co Ltd バンパ補強部材
JP2007038756A (ja) * 2005-08-01 2007-02-15 Toyoda Iron Works Co Ltd 自動車用バンパービーム
JP2010047077A (ja) * 2008-08-20 2010-03-04 Mazda Motor Corp 車両のバンパー構造

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2529299A (en) * 2014-07-04 2016-02-17 Gm Global Tech Operations Inc Bumper structure for a motor vehicle
US9604586B2 (en) 2014-07-04 2017-03-28 GM Global Technology Operations LLC Bumper structure for a motor vehicle
US10150259B2 (en) 2014-07-04 2018-12-11 GM Global Technology Operations LLC Method for manufacturing a bumper structure
US9533712B2 (en) * 2014-10-20 2017-01-03 GM Global Technology Operations LLC Wheel catcher assembly
JP2018172116A (ja) * 2017-03-31 2018-11-08 アイシン テクニカル センター オブ アメリカ インコーポレイテッドＡｉｓｉｎ Ｔｅｃｈｎｉｃａｌ Ｃｅｎｔｅｒ Ｏｆ Ａｍｅｒｉｃａ，Ｉｎｃ． 車両のためのハイブリッド・バンパー・ビーム、および、それを製造するための方法
CN112406759A (zh) * 2020-12-23 2021-02-26 湖州力椿汽车零部件有限公司 一种多级缓冲轻量化保险杠
FR3132887A1 (fr) * 2022-02-18 2023-08-25 Valeo Systemes Thermiques Poutre de pare-chocs pour véhicule automobile

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