WO2008150036A1 - Caisson d'impact renforcé - Google Patents

Caisson d'impact renforcé Download PDF

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Publication number
WO2008150036A1
WO2008150036A1 PCT/KR2007/002685 KR2007002685W WO2008150036A1 WO 2008150036 A1 WO2008150036 A1 WO 2008150036A1 KR 2007002685 W KR2007002685 W KR 2007002685W WO 2008150036 A1 WO2008150036 A1 WO 2008150036A1
Authority
WO
WIPO (PCT)
Prior art keywords
impact beam
reinforced
impact
reinforced impact
length
Prior art date
Application number
PCT/KR2007/002685
Other languages
English (en)
Inventor
Keun Sang Lee
Original Assignee
Keun Sang Lee
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 Keun Sang Lee filed Critical Keun Sang Lee
Priority to PCT/KR2007/002685 priority Critical patent/WO2008150036A1/fr
Publication of WO2008150036A1 publication Critical patent/WO2008150036A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60J—WINDOWS, WINDSCREENS, NON-FIXED ROOFS, DOORS, OR SIMILAR DEVICES FOR VEHICLES; REMOVABLE EXTERNAL PROTECTIVE COVERINGS SPECIALLY ADAPTED FOR VEHICLES
    • B60J5/00—Doors
    • B60J5/04—Doors arranged at the vehicle sides
    • B60J5/042—Reinforcement elements
    • B60J5/0422—Elongated type elements, e.g. beams, cables, belts or wires
    • B60J5/0438—Elongated type elements, e.g. beams, cables, belts or wires characterised by the type of elongated elements
    • B60J5/0443—Beams
    • B60J5/0444—Beams characterised by a special cross section
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60J—WINDOWS, WINDSCREENS, NON-FIXED ROOFS, DOORS, OR SIMILAR DEVICES FOR VEHICLES; REMOVABLE EXTERNAL PROTECTIVE COVERINGS SPECIALLY ADAPTED FOR VEHICLES
    • B60J5/00—Doors
    • B60J5/04—Doors arranged at the vehicle sides
    • B60J5/042—Reinforcement elements
    • B60J5/0422—Elongated type elements, e.g. beams, cables, belts or wires
    • B60J5/0438—Elongated type elements, e.g. beams, cables, belts or wires characterised by the type of elongated elements
    • B60J5/0443—Beams
    • B60J5/0445—Beams formed of several elements arranged in series

Definitions

  • the present invention relates to a technology applicable to structures, which need to be protected from external impact, such as pillars for supporting a bridge, box shapes like a container, chassis of a car, etc, capable of enhancing strength of supporting materials against impact load. More particularly, the present invention relates to an impact beam for securing structural safety by maintaining a constant strength while attached to a place vulnerable to an impact, as an impact beam attached to the inside of a car door.
  • FIG. 1 illustrates an impact beam attached to the inside of a car door.
  • the impact beam attached to the car door is a representative case of an impact beam.
  • the impact beam absorbs impact energy and maintains a constant strength.
  • the impact beam prevents the deformed car door from being crushed deeply into the car, and thus passengers in the car may be protected.
  • a conventional impact beam includes a beam 1 of a circular pipe having a constant diameter and brackets 2 for attaching the beam 1 to the car door 3.
  • the diameter or the thickness of the pipe is increased to cause the strength of the beam to be higher than the specified level.
  • the material cost, weight and occupation space are increased if the diameter or the thickness of the pipe is increased for manufacturing the safe impact beam.
  • the section modulus of the beam may be increased using a pipe having an increased diameter and a decreased thickness even though the volume or the weight of the beam material is maintained.
  • the beam stressed by the bending moment one side with respect to the central axis bears a tensile load and the other side bears a compression load. An abrupt breakage is caused due to buckling on the side bearing the compression load, and thus the thickness of the pipe is limited to some extent.
  • the section of beam may be modified to an I-shape or an elliptical shape.
  • the impact beam having an elliptical section from end to end is used often in a car door.
  • the conventional impact beam is difficult to be fastened to the car door because both ends are elliptical shape.
  • the conventional impact beam having an elliptical section from end to end is inefficient in dispersing a load along a length direction of the beam and has a relatively lower average bearing force compared with an impact beam according to mode for invention of the present invention. I-beams are hardly used since it is vulnerable to a torsion load and buckling. Disclosure of Invention Technical Problem
  • An impact beam which is used in structures to be protected from an external impact, has to be light with a relatively high strength, absorb relatively much impact energy, and have uniform quality.
  • the impact beam requires a predetermined strength so that the impact beam may not be broken under a specified impact load.
  • deformation energy must be higher than a predetermined level so that the impact beam may absorb the impact energy without being broken.
  • the impact beam is designed such that average reaction strength exceeds a specified level when load is applied to a central portion of the beam and thus the beam is bent by the greatest bending moment.
  • the average reaction strength corresponds to deformation energy divided by displacement due to the load and the average reaction strength is used for estimate an absorption rate of the impact energy.
  • the impact beam needs to have a larger section modulus, to be strong against buckling and to have a higher strength particularly in a central portion vulnerable to breakage.
  • both ends of the impact beam are supported by two opposite plates of the box (for example, top and bottom plates of the box when the impact beam is attached to a side plate of the box).
  • both ends of the beam are attached, by brackets, to a door-frame having a sufficient strength. Accordingly, when the load is applied to the beam structures where both ends of the beam are supported, the bending moment is highest in the central portion of the beam, and thus the breakage of the beam occurs in the central portion more frequently.
  • a reinforced impact beam according to mode for invention of the present invention may be formed of solid materials such as metallic materials, composite materials, or engineering plastic.
  • the impact beam may be reinforced in a central portion or the entire impact beam may be reinforced.
  • FIG. 12 illustrates experimental results of an average bearing force according to a ratio L/L of a reinforced length with respect to an entire length of an impact beam used in a car door.
  • the horizontal coordinate axis represents the ratio of the reinforced length
  • the vertical coordinate axis represents the average bearing force or the average reaction force in unit of kN (kilo-Newton).
  • the characters I represent the range of distribution in the average bearing force with respect to each ratio of the reinforced length for a number of samples.
  • the vertical coordinate axis represents a dispersion of the average bearing force that is represented in percentage with respect to a center value of the average bearing force.
  • the ratio '0' of the reinforced length ratio indicates a case where the beam is not reinforced at all and thus has a circular section from end to end
  • the ratio T of the reinforced length ratio indicates a case where has a elliptical section from end to end.
  • the average reaction force of the elliptical impact beam having the ratio " 1 " is higher than that of the circular impact beam having the ratio '0', thereby indicating that the elliptical impact beam is stronger than the circular impact beam. This is resulted from the fact that the section modulus is increased in a sectional diction perpendicular to the direction of the applied force by the load.
  • the average reaction force is highest and the dispersion is especially low when the impact beam having a constant diameter is reinforced by the ratio about '1/3' of the reinforced length with respect to the entire length.
  • the ratio about '1/3' shows critical characteristics in the average reaction force and uniformity of quality.
  • These enhancements may be caused by reinforcing the impact beam by the ratio about '1/3' so that the breakdown of the beam materials may be scattered in the reinforced portion such that gentle breakage occurs through slight V-shaped deformations, in contrast to other impact beams where the abrupt breakage occurs due to buckling and deformation in a boundary portion of reinforcement, which is weaker than the reinforced portion.
  • a reinforced impact beam according to mode for invention of the present invention may absorb relatively much impact energy compared with the conventional beam of the same amount of material.
  • the reinforced impact beam according to mode for invention of the present invention is lighter and more economical than the conventional impact beam having the same average bearing force that indicates capacity for absorbing impact energy, because the reinforced impact beam according to mode for invention of the present invention may be manufactured with less amount of material.
  • the reinforced impact beam according to mode for invention of the present invention may reduce manufacturing cost by effectually and conveniently reinforcing the strength of the impact beam.
  • FIG. 1 is a diagram illustrating an impact beam attached to a car door.
  • FIG. 2 is a diagram illustrating a conventional shape of an impact beam.
  • FIG. 3 is a diagram illustrating a reinforced impact beam according to a mode for invention of the present invention, in which a central portion is reinforced into an elliptical shape.
  • FIG. 4 is a diagram illustrating a reinforced impact beam according to a mode for invention of the present invention, in which a central length portion is coated with reinforcing material.
  • FIG. 5 is a diagram illustrating a reinforced impact beam according to a mode for invention of the present invention, in which a central length portion is reinforced with a supplemental pipe.
  • FIG. 6 is a diagram illustrating a reinforced impact beam according to a mode for invention of the present invention, in which an entire length portion is embossed. [24] FIG.
  • FIG. 7 is a diagram illustrating a reinforced impact beam according to a mode for invention of the present invention, in which a central length portion is entirely embossed with respect to a circumference direction.
  • FIG. 8 is a diagram illustrating a reinforced impact beam according to a mode for invention of the present invention, in which a central length portion is partially embossed with respect to a circumference direction.
  • FIG. 9 is a diagram illustrating a reinforced impact beam according to a mode for invention of the present invention, in which a central length portion of elliptical shape is entirely embossed with respect to a circumference direction.
  • FIG. 10 is a diagram illustrating a reinforced impact beam according to a mode for invention of the present invention, in which a central length portion of elliptical shape is partially embossed with respect to a circumference direction.
  • FIG. 11 is a diagram illustrating a reinforced impact beam according to a mode for invention of the present invention, in which a central length portion of elliptical shape is coated with reinforcing material.
  • FIG. 12 illustrates experimental results of testing an impact beam used in a car according to test requirements specified in the Federal Motor Vehicle Safety Standards
  • a reinforced impact beam according to a mode for invention is provided by processing a central portion of a pipe beam having a circular section into an elliptical shape so that the central portion corresponding to about 1/3 length of the entire length L of the beam may be reinforced.
  • a direction of a major axis corresponds to a direction of an applied force by a load, and the direction of the applied force is irrelevant in case of the circular section.
  • the elliptical section includes much sectional elements in far positions from a central axis and thus has a relatively higher section modulus compared with the circular section.
  • a circular pipe is pressed to induce plastic deformation such that the circular section may be transformed into the elliptical section.
  • various methods such as press, hydroforming, injection molding, etc. may be employed according to materials of the beam, as well known to those skilled in the art.
  • an impact beam may be reinforced by coating a central length portion of the impact beam with composite materials such as carbon fiber reinforced plastic or other high-strength plastic materials.
  • an impact beam may be reinforced in a form of concentric pipes by supplementing a central length portion of an original impact beam with a supplemental pipe.
  • the internal diameter of the supplemental pipe is substantially the same as the external diameter of the original impact beam, and the supplemental pipe may be formed with solid-state materials such as metallic materials, composite materials, engineering plastic, etc.
  • an impact beam of a circular section is widely used since a circular section can be conveniently manufactured and has relatively high and uniform stiffness or strength against impacts of all directions.
  • the section modulus of the beam may be increased by reducing the thickness of the beam pipe and increasing the external diameter of the beam. If excessively reducing the thickness and increasing the external diameter, however, buckling is easily caused on the side bearing the compression load with respect to the central axis and thus the beam is broken.
  • the strong and light impact beam may be provided by reducing the thickness and increasing the external diameter since the reinforced impact beam according to mode for invention of the present invention has a structure capable of reducing the buckling.
  • the reinforced impact beam according to mode for invention of the present invention may have the same performance as the conventional impact beam even though the amount of material and weight of the impact beam can be reduced.
  • wave patterns may be formed in the pipe of the impact beam.
  • uneven spot patterns of circular type or other types, or strait groove patterns may be formed in the pipe of a circular section or an elliptical section. Forming uneven spots or grooves on the surface of material as such is referred to as embossing.
  • the embossing portion may be an entire length portion of the beam as illustrated in FIG. 6.
  • the embossing portion may be a central length portion of the beam, where effect of the load is relatively severe, as illustrated in FIG. 7.
  • the reinforcing portion is entirely embossed with respect to the circumference direction of the beam in case of typical beam where the applied force due to the load is arbitrary.
  • the reinforcing portion is partially embossed with respect to the circumference direction of the beam. In this case, it is effectual to embossing partially the circumference portion to which the compression load is applied by the bending moment to cause buckling while the beam receives the impact load. In buckling, the impact surface portion under the compression load is dented and simultaneously both sides of the beam with respect to the impact surface portion are protruded.
  • protruding of both sides may be alleviated by reinforcing the impact surface portion, or denting of the impact surface portion may be alleviated by reinforcing both sides of the beam.
  • Respective reinforcement of the impact surface portion or both sides of the beam with respect to the impact surface portion may provide sufficient effect of reinforcement, and it is more effective to reinforce the impact surface portion and both sides of the beam with respect to the impact surface portion. As such, processing cost may be reduced through the partial embossing.
  • the strength of the impact beam may be further enhanced by entirely or partially embossing the reinforced central length portion as illustrated in FIGs. 9 and 10, or by coating the reinforced central length portion with composite materials such as carbon fiber reinforced plastic or other high-strength plastic materials as illustrated in FIG. 11.
  • a reinforced impact beam according to mode for invention of the present invention may be applied to various structures, which need to be protected from external impact
  • a reinforced impact beam according to mode for invention of the present invention may secure structural safety by absorbing impact energy when attached to a place vulnerable to impact to maintain a predetermined strength.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Body Structure For Vehicles (AREA)

Abstract

L'invention concerne une technologie applicable à des structures qui nécessitent d'être protégées contre un choc externe, par exemple, des piliers supportant un pont, des caissons du type conteneurs, châssis d'un véhicule, etc. capables d'augmenter la résistance de matériaux supports à l'encontre de charges d'impact. Le caisson d'impact nécessite une résistance prédéterminée, de façon que le caisson ne puisse être rompu sou l'effet d'une charge d'impact. Lorsque le caisson d'impact est déformé, l'énergie de déformation doit être supérieure à un niveau prédéterminé, de sorte que le caisson d'impact puisse absorber l'énergie d'impact sans être rompu. Un caisson d'impact renforcé conformément à l'invention présente une résistance au flambage accrue par renforcement d'une partie longitudinale centrale et/ou par emboutissage d'une surface du caisson. Le caisson d'impact renforcé selon l'invention peut absorber une énergie d'impact relativement élevée, comparativement aux caissons conventionnels d'une même quantité de matériau. Le caisson d'impact obtenu conformément à l'invention est léger et économique, du fait que le caisson d'impact renforcé peut être fabriqué avec une moindre quantité de matériau. En outre, le caisson d'impact selon l'invention permet de réduire le coût de la fabrication en renforçant efficacement et de manière pratique la résistance dudit caisson.
PCT/KR2007/002685 2007-06-03 2007-06-03 Caisson d'impact renforcé WO2008150036A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/KR2007/002685 WO2008150036A1 (fr) 2007-06-03 2007-06-03 Caisson d'impact renforcé

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/KR2007/002685 WO2008150036A1 (fr) 2007-06-03 2007-06-03 Caisson d'impact renforcé

Publications (1)

Publication Number Publication Date
WO2008150036A1 true WO2008150036A1 (fr) 2008-12-11

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ID=40093832

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2007/002685 WO2008150036A1 (fr) 2007-06-03 2007-06-03 Caisson d'impact renforcé

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WO (1) WO2008150036A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012065717A1 (fr) * 2010-11-15 2012-05-24 Johnson Controls Interiors Gmbh & Co. Kg Élément d'équipement intérieur de véhicule présentant une résistance aux chocs accrue
EP2848439A4 (fr) * 2012-05-07 2015-05-13 Jfe Steel Corp Élément de renfort de porte de véhicule automobile

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5093990A (en) * 1989-10-26 1992-03-10 Mannesmann Ag Process for reinforcing a motor vehicle door
JPH0986171A (ja) * 1995-09-20 1997-03-31 Tokai Rubber Ind Ltd 自動車ドア用インパクトビーム
KR19980020587U (ko) * 1996-10-15 1998-07-15 박병재 자동차의 도어 임팩트빔 보강구조

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5093990A (en) * 1989-10-26 1992-03-10 Mannesmann Ag Process for reinforcing a motor vehicle door
JPH0986171A (ja) * 1995-09-20 1997-03-31 Tokai Rubber Ind Ltd 自動車ドア用インパクトビーム
KR19980020587U (ko) * 1996-10-15 1998-07-15 박병재 자동차의 도어 임팩트빔 보강구조

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012065717A1 (fr) * 2010-11-15 2012-05-24 Johnson Controls Interiors Gmbh & Co. Kg Élément d'équipement intérieur de véhicule présentant une résistance aux chocs accrue
EP2848439A4 (fr) * 2012-05-07 2015-05-13 Jfe Steel Corp Élément de renfort de porte de véhicule automobile

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