Showing papers on "Crash box published in 2007"

Crash Box for a Vehicle

Abstract: A crash box consists of two U-profiles ( 18, 19 ) of sheet metal, the webs of which ( 21, 23 and 20, 22 ) overlap and are joined such that the crash box obtains a closed profile. The two joined sides ( 21, 23 and 20, 22 ) of the crash box have a number of transverse dents ( 26 - 33 ) with intermediate side areas ( 34 - 40 ) along their lengths. One web, or both webs, in one pair or in each pair of joined webs ( 21, 23 and 20, 22 ) has notches ( 50 - 54 ) in its edge in some of the dents ( 26 - 33 ) or in the intermediate areas ( 34 - 40 ), or both of these, as initiators of deformation.

Metal Foams—from Fundamental Research to Applications

Abstract: Aluminium foam can be manufactured applying a variety of methods including direct foam- ing of aluminium alloy melts and advanced metal powder processing. Complex-shaped foam compo- nents and 3D-shaped sandwich panels consisting of foam cores and aluminium face sheets can be produced. A short review of the most promising techniques is given. The application potential of these materials is discussed for various fields, namely light-weight construction, crash energy absorption and thermal or sound insulation. Various case studies are presented—a lifting arm for a lorry, a crash box for a car, an impact energy absorber for a tram, a motor bracket for a car and a transverse beam for a machine. Such studies allow us to assess in which application fields aluminium forms perform well and in which direction future development should be directed.

Vehicular crash box structure

Abstract: PROBLEM TO BE SOLVED: To enhance productivity in assembling and to control a buckling mode by stabilizing imparted load characteristics. SOLUTION: In the crash box structure, flange parts 24 obliquely and outwardly projected from a portion where it is superposed on a second panel member 14 by a predetermined length and extending along a longitudinal direction, are provided on free ends at both side end parts of a first panel member 12. On left and right side surfaces of the crash box 10 comprising a square cylindrical body, a vertical bead 32 extending along a vertical direction is formed on a former half part 30a with a load given thereto and a lateral bead 34 extending along a longitudinal direction of the vehicle is formed on a latter half part 30b. COPYRIGHT: (C)2009,JPO&INPIT

Vehicle body structure of automobile

Abstract: PROBLEM TO BE SOLVED: To provide a vehicle body structure of an automobile which can surely exhibit absorption performance of a collision energy by definitely buckling deforming a crash box not only upon receipt of a load from the front surface but also even upon receipt of a load offset in the vehicle width direction in the vehicle body structure of the automobile having the crash box at the tip end of a vehicle frame extending in the longitudinal direction of the vehicle. SOLUTION: The crash box 3 has a substantially cross-shaped closed section (a substantially boxed cross shape), and specifically, four substantially rectangular protrusions 35, 36, 37, 38 extend upward, downward, rightward, and leftward. The lengths L of the sides of the protrusions 35, 36, 37, 38 are almost equal to each other. Each angle α of the corners 39, 40 between the sides is set substantially at the right angle (90°). COPYRIGHT: (C)2009,JPO&INPIT

Bumper reinforcement supporting structure

Abstract: PROBLEM TO BE SOLVED: To roughly uniformly transmit a load to a fore end surface of an energy absorbing member from a bumper reinforcement SOLUTION: A crash box 10 is constituted of fiber reinforced resin and is furnished with main wall parts (10F, 10G, 10H, etc) the longitudinal directions of which is arranged along the vehicle body fore-and-aft direction and a mounting wall part 10K integrally molded toward the vehicle width inside direction from front ends of the main wall parts Further, the bumper reinforcement 20 is fixed by a bolt 26 and a nut 28 on the mounting wall part 10K of the crash box 10 with a reinforcing plate 30 nipped therebetween The reinforcing plate 30 is formed in a prescribed plate thickness T1 of a metal plate such as iron, aluminum, etc and is devised to roughly uniformly transmit the load to the fore end surface of the crash box 10 from the bumper reinforcement 20 by reinforcing the mounting wall part 10K of the crash box 10 when the load works on the crash box 10 from the bumper reinforcement 20 in collision of a vehicle COPYRIGHT: (C)2008,JPO&INPIT

Bumper mounting part structure

Abstract: PROBLEM TO BE SOLVED: To expand design flexibility of a shock absorbing member. SOLUTION: In a bumper mounting part 10, a crash box 18 is disposed between a front side member 14 and a bumper reinforcement 16, and a bracket 20 is disposed between the crash box 18 and the bumper reinforcement 16. Axial compressive strength of the vehicle longitudinal direction of the bracket 20 is higher than that of the crash box 18 and the bumper reinforcement 16. COPYRIGHT: (C)2008,JPO&INPIT

Rail vehicle with crash equipment

Abstract: The invention relates to a railway vehicle, in particular for railway traffic, with crash equipment for protecting the driver's cab in the event of an impact or a frontal collision with an object. Based on the disadvantages of the known prior art, a crash equipment is to be created, which is characterized by an improved absorption effect and ensures in a frontal impact, an integrity of the driver's cab. For this purpose, we proposed as a solution to use as energy absorbing elements a buffer 5, 6 and a crash box 7, 8, which are delayed in action. The crash box 7, 8 is fixedly connected to the car body 1 and on its front side, the buffer 5, 6 is fixed. This consists of a punch 14, a connected thereto reversible lifting element 15 and an irreversible energy absorbing lifting element 17, wherein the reversible lifting element 15 is in direct contact with the irreversible lifting element 17. The crash box 7, 8 is formed as a double-walled, box-like sheet metal component, the inner and outer walls 11, 24 at locally defined locations component weakenings and extending in the longitudinal direction bends 25, such that the crash box deforms during energy absorption by folding and compression operations. After the energy absorption, the crash box forms together with the buffer a nearly rigid unit that initiates any existing longitudinal forces in the car body.

A crash box for a vehicle

Abstract: A crash box consists of two U-profiles (18, 19) of sheet metal, the webs of which (21, 23 and 20, 22) overlap and are joined such that the crash box obtains a closed profile. The two joined sides (21, 23 and 20, 22) of the crash box have a number of transverse dents (26-33) with intermediate side areas (34-40) along their lengths. One web, or both webs, in one pair or in each pair of joined webs (21, 23 and 20, 22) has notches (50-54) in its edge in some of the dents (26-33) or in the intermediate areas (34-40), or both of these, as initiators of deformation.

Vehicle body structure

Abstract: PROBLEM TO BE SOLVED: To provide a vehicle body structure which prevents or reduces influence of a crashed remainder produced in a connecting part of a bumper reinforcement, etc. and a crash box and a side member, etc. in absorbing energy of a load. SOLUTION: The recessed crash box side connecting part 38 opened toward the side of a bumper reinforce 46 is formed on a connecting plate 36, and a bolt storage part 70 formed on the bumper reinforce 46 enters the inside of it. A head part of a bolt 78 to fasten the bolt storage part 70 and the crash box side connecting part 38 enters the inside of the bolt storage part 70, and the head part of the bolt 78 remains in the region of the crashed remainder of the crash box 22 when the bumper reinforce 46 receiving the load from the roughly vehicle front side pressurizes and deforms the crash box 22. Consequently, the head part of the bolt 78 never influences energy absorption as the crashed remainder. COPYRIGHT: (C)2007,JPO&INPIT

Crash box and method of manufacturing the same

Abstract: PROBLEM TO BE SOLVED: To provide a crash box provided with an impact absorption material comprising a fiber-reinforcement resin with easy molding and high yield ratio of a raw material capable of being provided with required mechanical strength by the small number of laminatings. SOLUTION: A reinforcement fiber is knitted to a cylindrical shape by a braiding method to be made to a reinforcement fiber knitted body 3. It is crushed to a flat shape to be made to a flat reinforcement fiber knitted body 4 and it is formed to a stereometric shape. The reinforcement fiber knitted body 5 formed so as to become the stereometric shape is placed in a molding die 10, and it is made to the impact absorption material 7 comprising the fiber-reinforced resin in which the reinforcement fiber and the resin are integrated by an injection molding method. It is made to the crash box 9 using the same. COPYRIGHT: (C)2009,JPO&INPIT

Crash box for a vehicle

Abstract: A crash box (11,12) is positioned high relative to the bumper beam (13) on, for example, an SUV. The underside (22) of the crash box has a profiled cross-section with upper (25,26) and lower (24) longitudinal portions. At least one upward profile portion (25,26) changes to being a downward-pointing profile portion (27,28) near to the outer end of the crash box, thereby increasing the vertical extent of the crash box. The underside of the crash box may have a hat profile which at its outer end changes to an inverted hat profile.

Absorbing impact device of crash box

Abstract: A shock absorbing device of a crash box for a vehicle is provided to achieve improved safety by preventing the crash box from being easily broken down during an initial stage of a vehicle crash so as to absorb a large amount of shock energy during the initial stage of the vehicle crash. A shock absorbing device of a crash box(13) for a vehicle includes a shock absorbing beam(21), a sliding block(23), a fixed wall(25), an elastic member(27), an operating pin actuator(29), a vehicle speed sensor(43), and a crash sensor(45). The shock absorbing beam is arranged in the length direction in hollow portions formed in the crash box and a side member(11), and has a front end supporting a bumper beam(5). The sliding block is formed integrally with a rear end of the shock absorbing beam such that the sliding block contacts the hollow portion of the side member and is slidable. The sliding block has an upper surface and a lower surface with respective pin holes. The fixed wall is fixed in a rear portion of the side member. The elastic member is interposed between the fixed wall and the sliding block in the side member. The operating pin actuator is mounted on an outer upper surface and an outer lower surface of the side member in correspondence to each pin hole of the sliding block such that the operating pin actuator inserts operating pins(28) into the pin holes in accordance with the control signal output from a controller(41). The vehicle speed sensor senses the vehicle speed and outputs a signal to the controller. The crash sensor senses a vehicle crash and outputs a signal to the controller.

Method for manufacturing crash box in vehicles

Abstract: A method for manufacturing a crash box for a vehicle is provided to achieve improved crash energy absorbing performance by using a plurality of aluminum extrusion pipes. A method for manufacturing a crash box for a vehicle, includes a step(S10) of designing a crash box(1) into a crash member(3), and a front bracket(5) and a rear bracket(7) to be assembled to the front and rear sides of the crash member; a step(S20) of heating and extruding an aluminum ingot by using an extruding device on the basis of design data of the crash member and the front and rear brackets, and extrusion molding aluminum extrusion pipes(11) for the crash member and aluminum extrusion pipes(13) for the front and rear brackets through a water cooling process; a step(S30) of trim molding the aluminum extrusion pipes for the crash member and the aluminum extrusion pipes for the front and rear brackets into a crash member and front and rear brackets by trimming unnecessary parts of the aluminum extrusion pipes; a step(S40) of piercing rivet holes(H) at a connection portion of the crash member and the front and rear brackets; and a step(S50) of fitting front and rear brackets to front and rear portions of the crash member, and coupling the crash member and the front and rear brackets through rivets(27).

A New Method for Reducing Dimensional Variability of Extruded Hollow Sections

Abstract: Crash boxes are one recent application example of aluminum extrusions in the automotive industry. A crash box is typically made by welding an extruded tube (tower) to a foot plate at one end, providing the mounting features towards the rail tip of the vehicle. When using fully automated welding processes, the exterior dimensions of the tower have to be within a tolerance of typically +/− 0.25 mm in order to provide consistent weld properties. However, the extrusion process commonly introduces dimensional variations exceeding those required for good weld quality. In order to avoid costly hydro‐forming processes, a new mechanical calibration process has been developed. This method represents a means to achieve sufficient dimensional accuracy of the crash box tower prior to welding. A prototype die was made to validate the calibration process using alloy AA6063 T4 extrusions. Tensile tests were performed in order to determine material parameters. The geometry of each tower was carefully measured before and after forming to determine the dimensional capability of the calibration process. Statistical methods were combined with FEA simulations and analytical methods to establish surrogate models and response surfaces. The results show that the calibration process is an effective method for improving the dimensional accuracy of crash box profiles, providing significant improvements in dimensional capability. It is concluded that the methodology has a high industrial potential.

Towing hook structure of vehicle

Abstract: PROBLEM TO BE SOLVED: To ensure a deformation stroke of a vehicle body frame in collision while ensuring towing strength, in a towing hook structure of a vehicle. SOLUTION: A crash box 14 is provided at an end portion of a front side rail 12 (a vehicle body frame) extending in a vehicle fore-and-aft direction, and the towing hook 16 supported on the front side rail 12 side is disposed along the crash box 14. Therefore, the bulging amount of the towing hook 16 is decreased, and the input of moment and the like to the towing hook 16 and the supporting portion thereof at the time of towing can be reduced, so that the towing strength can be easily ensured. The towing hook 16 is structured to separate from the crash box 14 at the time of compressing/deforming a shaft of the crash box 14, and the deformation stroke of the crash box 14 can be sufficiently ensured. COPYRIGHT: (C)2007,JPO&INPIT

Impact-energy-absorbing structural components made of a 3000 series aluminium alloy for the body of a motor vehicle

Abstract: The subject of the invention is a structural component for the body of a motor vehicle, intended for irreversibly absorbing the energy involved in collisions between the vehicle and an obstacle, or in a crash, characterized in that it is produced from an extruded section made of an aluminium alloy of the 3xxx series according to the Aluminium Association nomenclature. The component may be a shock absorber, also called a deformation element or crash box, but also, non-limitingly, it may be a door sill member, a centre, front or rear pillar, a lateral door reinforcement, an anti-intrusion rail or a component of a bumper unit.

Crash-box of automobile

Abstract: A crash box for a vehicle is provided to improve shock absorbing performance of the vehicle upon occurrence of vehicle collision without increasing the size of the crash box. A crash box for a vehicle, includes a crash box body(50), shock absorbing plates(60), and a crack protrusion(70). The crash box body is interposed between a bumper and a vehicle frame so as to absorb shock upon occurrence of vehicle crash. The crash box body is corrugated such that the crash box body is foldable. The shock absorbing plates are arranged in the crash box body. The crack protrusion is formed on a front frame(52) of the crash box body so that the shock absorbing plate is torn when the crash box body is folded.

A crash box for a vehicle

Abstract: A collision box consisting of two U-profiles 18, 19 of sheet metal, the webs 21, 23 and 20, 22 overlapping and interconnecting so that the collision box obtains a closed profile. The two connected sides 21, 23 and 20, 22 of the collision box have a plurality of transverse depressions 26-33 and intermediate side regions 34-40 along their lengths. One web or two webs of one or more pairs of the connected webs 21, 23 and 20, 22 are part of the depressions 26-33, or some of the intermediate portions 34-40, or as modification initiation. At the edges of all have notches 50-54.

Crash box and impact absorbing method

Abstract: PROBLEM TO BE SOLVED: To provide an impact absorbing member capable of securing a predetermined amount of impact absorption by stably buckling in bellows shape in an axial direction when loaded with impact load without causing bending in the axial direction or the increase of weight due to the addition of a partition wall and an increase in plate thickness. SOLUTION: This crash box has axial cross-sectional shape formed as a closed cross section of almost polygonal shape with no flange on the outside of the closed cross section. In a region of at least one side of a basic cross section specified as a polygon with the largest area out of polygons obtained by connecting a portion of a plurality of vertices constituting the almost polygonal shape, a groove which is recessed toward the inside of the basic cross section is provided in a location other than an end point of the side. Further, a residual region of the side excluding a partial region of the side having the groove part is formed in a curve. COPYRIGHT: (C)2007,JPO&INPIT

Foodstuff garbage disposers

Abstract: The utility model relates to the field of daily articles, especially relates to a foodstuff garbage disposal device comprising a motor, feeding box, a crash box, a discharge slot. The feeding box is constituted by a feeding port and a base, the crash box has a rotatable crash disk therein, which is fixed on the main motor power shaft and which has a cutterhead disposed therein and a discharge slot under it. The foodstuff garbage disposal device is characterized in that: a fence crash ring fixed on the interior wall of the crush box, a clearance existing between the edge of the crush disk and the crush ring, and the top of the crush ring, which has protrudent point on its interior wall, has been pressed so as to be restricted moving up and down, thereby, preventing the blades, within the cutterhead, flying out when an accident happens on the cutterhead. The motor of the foodstuff garbage disposal device of the present utility model is an AC squirrel cage motor which has low noise and better performance.

Crash box device

Abstract: A crash box device and an impact absorption system with a crash box device are provided for motor vehicles. The device includes, but is not limited to: a deformable element for absorbing a collision force impacting in the main direction through a corresponding re-shaping and/or damping movement, an impact limitation device fastened on one final range of the deformable element, a support element connected with the other final range of the deformable element, preferably the final range which is opposite the other final range for the reception of the deformable element and for attaching further building components and fasteners to attach the deformable element with the impact limitation device and/or the support element. The fasteners comprise at least one holding area for holding the deformable element and the at least one guiding area branching off of this, which, in case of a collision, makes possible the movement of the deformable element from the holding area along the guiding area in a additional direction which deviates from the main direction.

Crashworthiness Optimization of Crash Box in Automotive Structure

Abstract: In this paper the energy absorption of thin-walled aluminium tubes used as crash boxes in the body structure of a vehicle has been optimized. In order to achieve this, various cross-sections of extruded aluminium were chosen and their behaviour under dynamic impact loading was investigated. The crash boxes were made from aluminium alloy 6060 temper T4. Finite element software LS-DYNA in ANSYS was used for modelling. For each cross-section, the results of dynamic crushing load versus crushing distance was obtained from the FE simulation and the results were compared with the experimental and numerical work on a square crash box in the literature. Parameters such as the crush force efficiency and the specific energy of various crash boxes were compared with the relevant ones for the square crash box and the most efficient crash box was recommended.

보행자 보호와 차량 저속 충돌 성능을 고려한 차량 전면 구조물의 설계

Abstract: Various regulations are related to the automobile frontal structure. They are for pedestrian protection, the FMVSS part 581 bumper test and the RCAR test. In this research, a new bumper system is designed to meet the performance for pedestrian protection as well as FMVSS part 581 bumper test. The details are that a new bumper system is obtained for lower leg impact protection and 8 ㎞/hr pendulum bumper test. There are conflictions in the design requirements. For lower leg protection, a relatively soft bumper system is required while a relatively stiff system is typically needed to sustain the pendulum impacts. An abstract design of a new bumper system is proposed. For detailed design, the system is analyzed by using the nonlinear finite element method. An optimization problem is formulated to incorporate the analysis results. The response surface approximation optimization (RSAO) algorithm is utilized to solve the formulated problem. In addition to the above regulations, the research committee for automobile repairs (RCAR) is considered to reduce the repair cost. The repair cost in a low speed crash could be reduced by using an energy absorbing component such as a crash box. Also, the crash box is analyzed by using the nonlinear finite element method. An optimization problem is formulated and the discrete design using orthogonal arrays (DOA) method is utilized to solve the formulated problem. DOA is utilized for design in the discrete space and the results of the design are discussed.

Shock absorbing structure of automobile

Abstract: PROBLEM TO BE SOLVED: To provide a shock absorbing structure of an automobile capable of preventing any bending deformation or the like in a vehicle body skeleton member even when a load is obliquely input. SOLUTION: The target axial force limit value F1min for compression-deformation and the target moment limit value M1min for bending-deformation of a crash box 6 by the load F to be input in an oblique direction with respect to the vehicle center line L are set to be the values smaller by predetermined values than the allowable axial force limit value Fmax and the allowable moment limit value Mmax of side members 1, 2, respectively. The crash box 6 is subjected to compression deformation before the moment value thereof reaches the target moment value M1min, and subjected to the bending deformation thereafter. COPYRIGHT: (C)2008,JPO&INPIT