46results about How to "Stable energy absorption" patented technology

The invention relates to a structure of an energy-absorbing motor steering column. The mandrel of the steering column comprises an upper section and a lower section which are connected with each other by a spline, a protection tube is installed outside the upper section of the mandrel, a column shell is installed outside the lower section of the mandrel, a bushing is arranged between the inner wall of the upper section of the column shell and the outer wall of the lower section of the protection tube, and the bushing is limited and fixed along the axial direction; the lower end of the protection tube is provided with a convex part which is matched with a guide groove on the bushing, the side of the guide groove is provided with a shrinkage groove, in which the guide groove can stretch, and the column shell, the bushing and the protection tube are connected and fixed by pins; relative sliding does not occur between the upper section of the mandrel and the lower section thereof under the normal condition by using the pins to support the protection tube; when the pins are cut to be short since the automobile collides, the protection tube and the upper section of the mandrel are guided to move downwards along the guide groove by the convex part arranged at the lower end of the protection tube, so that the impact energy is transferred to the bushing. By the improvement of the mechanism, the whole steering column is closed, has simple and compact structure as well as stable energy absorption, and can still have steering operation when being collided.

The invention discloses a composite energy absorption tube machining device which comprises a rectifier (1), a resistor (2), a switch (3), a capacitor (4), a boosting transformer (5), an upper fixing plate (6), a fixing bolt (7), a pressing block (8), a mould frame (9), a constraint mould (11), a coil (12), a lower fixing plate (13), a T-shaped platform (14), an exhaust vent (16), a fixing groove (17) and a wire hole (18). Compared with a hydraulic forming method and a mechanical bulging method, a composite metal energy absorption forming method based on the electromagnetic forming principle and used in the composite energy absorption tube machining device is high in machining efficiency and high in the pipe fitting forming speed and enables composite metal tubes to be formed under the high strain rate; due to the fact that the high strain deformation process can be used for forming metal materials which are deformed difficultly through a conventional method, the plasticity of the metal materials is greatly improved, and the yield strength of the materials is greatly improved. Different wave forms and reinforcing ribs can be formed by changing the shape of the constraint mould in a mould body, and the machining flexibility is high.

The invention discloses a multiphase synchronous rectification BUCK topology circuit which comprises a main control unit and an output filtering capacitor, and each phase circuit comprises a capacitor energy storage unit, a charging power unit, a synchronous rectification unit, a drive circuit, a fly-wheel diode and an inductive energy storage unit; the main control unit is respectively connected with the drive circuit of each phase circuit, and the drive circuit of each phase circuit is connected with the synchronous rectification unit, and the charging power unit; and the input end of each phase is connected in parallel, the output end of each phase is connected in parallel and connected to the output filtering capacitor. The technical scheme of the invention is adopted, each phase BUCK circuit is independently controlled, and flow equalization adjustment is automatically performed, thus option is simpler; the topology circuit has higher conversion efficiency under the occasion of low current; and meanwhile, when one phase is in failure, other phases are not influenced, and the working state is more stable and reliable.

The invention relates to an anti-falling-collision energy absorption support post under an airplane floor. The energy absorption support post comprises two composite material pipes in left and right symmetrical arrangement. In the initial period, the angle theta is respectively formed between each of the two composite material pipes and the vertical direction; one end of each composite material pipe is connected with a cross beam of the airplane floor board through a joint bearing and a support seat; the other end of each composite material pipe is connected with a machine body frame through ajoint bearing and a connector. Compared with the prior art, the anti-falling-collision energy absorption support post has the advantages that in the airplane falling collision process, the compositematerial pipe only receives axial force; sudden fracture cannot occur; the structure can maintain the completeness; the energy absorption is more stable; the efficiency is high; the energy absorptioncapability of the composite material in the fragment compaction stage is utilized to the maximum degree; the advantages of no fragment overflow in the compaction process and the like are realized.

The invention relates to an energy absorbing device which comprises an expansion rod and an energy absorbing tube. The expansion rod is disposed in the energy absorbing tube, the hardness of a protrusion arranged on the outer side wall of the expansion rod is higher than that of the energy absorbing tube, the outer diameter of the protrusion of the expansion rod is larger than the inner diameter of the energy absorbing tube, and the expansion rod is clamped on the inner side wall of the energy absorbing tube through the protrusion. During use of the energy absorbing device having the structure, the expansion rod applies acting force to the energy absorbing tube through the protrusion in case of collision, and impact resistance is generated by plastic deformation of the energy absorbing tube, so that stability in energy absorption is realized. The energy absorbing device is simple in structure, stable in performance, high in energy absorbing efficiency and not easy to lose effectiveness. In addition, lubricant can be coated on the surface of the inner side wall of the energy absorbing tube to guarantee acting effects of the expansion rod and the energy absorbing tube.

The invention discloses a car front safety anti-collision beam. The car front safety anti-collision beam comprises a body, a truss and an energy suction box fixedly connected with the truss, the trusscomprises a first trapezoidal body, a second trapezoidal body and a third trapezoidal body which are connected in sequence, the transverse dimension of the second trapezoidal body is gradually decreased from the inner side of the body to the outside, and the transverse dimension of the first trapezoidal body and the transverse dimension of the third trapezoidal body are gradually increased from the inner side of the body to the outside; and the first trapezoidal body, the second trapezoidal body and the third trapezoidal body are all connected with the body. The truss disperses local impact force into the three trapezoidal bodies in the mode that one of the first trapezoidal body, the second trapezoidal body and the third trapezoidal body extrudes the other two to generate displacement, and the impact force is transmitted to the whole body through the three trapezoidal bodies so as to avoid stress concentration. Meanwhile, according to the truss structure, the rigidity of the body canbe improved, and the anti-collision performance of the body is improved.

There is provided a vehicle equipped with a shock absorbing structure that can absorb collision energy stably under all collision conditions to ensure the safety of crew members and passengers. The shock absorbing structure is arranged in an end part of the vehicle. The shock absorbing structure comprises an upper-stage shock absorbing structure 100 that is arranged in an upper part of a crushable zone to absorb collision energy by being crushed by a predetermined load, a lower-stage shock absorbing structure 120 that is arranged in a lower part of the crushable zone to absorb the collision energy by being crushed by the predetermined load, and a middle-stage shock absorbing structure 110 that is held between the upper-stage shock absorbing structure 100 and the lower-stage shock absorbing structure 120 arranged over and under the middle-stage shock absorbing structure 110. The middle-stage shock absorbing structure 110 includes a buffer structure 112 and a slide structure 113, and the buffer structure 112 is slid to the rear by the predetermined load.

The invention discloses a cutting type anti-creeper. The cutting type anti-creeper comprises an anti-creeping toothed plate, energy absorption tubes, a tool installing flange and cutting tools, wherein one ends of the energy absorption tubes are fixedly arranged on the anti-creeping toothed plate, and the tool installing flange is arranged on the other ends of the energy absorption tubes in a sleeved mode, the cutting tools are fixedly arranged on the tool installing flange, make contact with the energy absorption tubes and are used for cutting the energy absorption tubes when the impact force reaches a set threshold value. According to the cutting type anti-creeper, optimization is conducted on a cutting type buffer structure, by means of the mode that a process groove is machined on a buffer structural part, a friction force change caused by deformation of the energy absorption tubes is reduced, and stable energy absorption process of the cutting type anti-creeper can be facilitated. Meanwhile, the bearing capacity of the cutting type anti-creeper is improved, the friction force of the buffer structure is reduced, and therefore the stability and precision of the buffer powder are improved.

The invention discloses an automobile B-column capable of realizing multi-axis concentrated energy absorption. The automobile B-column comprises a B-column outer plate, a micro-cell filling layer, anda B-column inner plate. The micro-cell filling layer is a stereoscopic structure formed by successively arranging and combining multiple cell bodies in an X direction and a Y direction. The cell bodyis formed by connecting two symmetrical sub-cells. The sub-cell comprises a force transmitting part, a first vertical energy absorption part, a second vertical energy absorption part, a first horizontal energy absorption part, and a second horizontal energy absorption part. One end of the force transmitting part is connected with the first vertical energy absorption part through a first horizontal force transmitting plate, and the other end is connected with the first horizontal energy absorption part. The first vertical energy absorption part is connected with the second vertical energy absorption part. An included angle between the first vertical energy absorption part and the second vertical energy absorption part is 135-165 degrees. The first horizontal energy absorption part is connected with the second horizontal energy absorption part through a second horizontal force transmitting plate. The other end of the second horizontal energy absorption part is connected with the secondvertical energy absorption part. The automobile B-column is low in initial peak value during a collision process, stable in energy absorption process, and good in energy absorption effect.

The invention provides an automobile collision energy absorbing box. The automobile collision energy absorbing box comprises an upper flange plate, a compound shell, internal filling, a cone-frustum inner tube and a lower flange plate; the upper portion of the compound shell is a square box, and five defect holes are formed in each side face of the square box along the diagonal line; the lower portion of the compound shell is a table body corrugated pipe, and the lateral edges of the compound shell are of sinusoidal corrugation structures; the cone frustum inner tube is arranged in the compound shell, and the space between the cone frustum inner tube and the compound shell is filled with the internal filling, wherein the filling between the square box and the cone frustum inner tube is ofa honeycomb structure, and the filling between the table body corrugated pipe and the cone frustum inner tube is of a lattice structure. The automobile energy absorbing box is high in energy absorbingstability and good in energy absorbing effect.

The invention provides a steering column, and belongs to the technical field of steering columns. The steering column comprises a column body and a clamping assembly, wherein the column body comprisesa steering shaft, an upper column and a lower column; the first end of the upper column is arranged on the first end of the lower column in a sleeving manner; the two ends of the steering shaft are rotatably inserted into the upper column and the lower column respectively; a strip-shaped notch is formed in the side wall of the upper column; the strip-shaped notch extends from the end part of thefirst end of the upper column to the middle part of the upper column along the axial direction of the upper column; limiting teeth are arranged on the inner wall of the middle of the strip-shaped notch; a pin is arranged on the peripheral wall of the lower column, inserted into the strip-shaped notch and located at the first end of the upper column; the pin makes contact with the inner wall of thestrip-shaped notch; two clamping plates are arranged on the peripheral wall of the upper column; and the clamping assembly is configured to clamp the two clamping plates. The steering column providedby the invention can stably absorb part of impact energy in secondary collision of a driver.

The invention relates to an automobile anti-collision beam. An energy storage buffer box is of a structure that a piston is matched with an elastic piece; the elastic piece can effectively store impact energy, so that damage to passengers in an automobile is reduced, and the safety of pedestrians outside the automobile is protected. Under a low-speed condition, the elastic piece serves as an energy storage element to store certain collision energy, so that the safety of the passengers can be effectively protected. Compared with a traditional automobile anti-collision beam of which the energy absorption box is directly stressed to deform in a collision process, and the automobile anti-collision beam enables an energy absorption process to be smoother. Meanwhile, when automobiles collide with each other at a high speed, the hollow structure of the piston enables the elastic piece to be impacted by loads, subsequent metal plastic deformation can be generated to absorb impact energy aftera compression amount reaches a maximum value, and therefore, the safety of a passenger compartment is improved. Layered self-similar energy absorption boxes increase the energy absorption effect of the anti-collision beam.

The invention provides an energy absorbing type rear protection device capable of automatically adjusting height. The energy absorbing type rear protection device capable of automatically adjusting the height comprises two ground clearance detection mechanisms, two 4-shaped brackets, a transmission mechanism, B-shaped cross beams and energy absorbing units; the two 4-shaped brackets are symmetrically mounted on the external side surfaces of two longitudinal beams at the tail part of a commercial vehicle; the two 4-shaped brackets are connected with each other through the transmission mechanism; the B-shaped cross beams are connected to the end surfaces, facing the vehicle tail, of the 4-shaped brackets through the energy absorbing units; the two ground clearance detection mechanisms are correspondingly connected to the internal sides of the two longitudinal beams at the tail part of the commercial vehicle through connecting pins; each ground clearance detection mechanism comprises a connecting head, a connecting rod and a plate with a universal wheel; the connecting heads are mounted on the internal sides of the longitudinal beams at the tail part of the commercial vehicle throughconnecting pins; and the connecting heads can rotate around the connecting pins. According to the energy absorbing type rear protection device capable of automatically adjusting the height, the obstacle crossing ability is realized, collision energy can be stably absorbed stage by stage, the rigidity in the height direction is distributed in a graded manner, and an automobile suffering rear-end collision can be effectively prevented from getting to the bottom of a truck.

The invention discloses a preparation method for an alumina-based foam material. The method comprises the following steps: firstly, plating a layer of metal on the surface of carbon fiber, and adding the carbon fiber with the metal coating into aluminum or aluminum alloy fusant; then adding titanium hydride, and stirring evenly; and taking the carbon fiber out after foaming, and cooling to obtainthe alumina-based foam material with enhanced fiber. In the invention, the carbon fiber is introduced into the preparation of the foamed aluminum material, thereby realizing that the stability of bubbles and material performance are improved; and compared with the prior art, the compressive strength of the foamed aluminum material prepared by the invention is higher than 6Mpa, the impact toughness is improved by about 30%, and the energy absorption capability is improved by more than 50%, thus the compression strength, the energy absorbing and damping performances of the alumina-based foam material with short enhanced carbon fiber are remarkably improved, and the pore wall toughness of the material is better.

The invention discloses a double-gradient-strength passenger car stand column structure. The double-gradient-strength passenger car stand column structure is characterized by consisting of a longitudinal gradient strength stand column and a transverse filling gradient density foam material. As the transverse filling density foam material is bonded on the inner side wall of a gradient strength L-shaped plate in the length direction of the gradient strength L-shaped plate, the collision force of the key part-stand column of a passenger car closed loop structure can be guaranteed to be matched with the strength of the corresponding position in the passenger car tilting process, the stress of each surrounding part of a passenger car is more uniform, and the unloading of external impact load is facilitated. In addition, the transverse filling gradient density foam material enhances the rigidity of the stand column, and the energy absorption is more stable in the tilting of the passenger car, so that secondary collision casualties are reduced. Meanwhile, the foam material also achieves the effects of sound isolation and heat insulation, and improves the tilting safety and the comfort of the passenger car.

The invention relates to an electrical cabinet trolley. The electrical cabinet trolley comprises two parallel bearing frames, each of two ends of each bearing frame is movably connected with one end of a support rod via a rotary shaft, a baffle articulated with the support rod is arranged at the part, close to the corresponding rotary shaft, of the inner side of each support rod, each universal wheel comprises a hub and a tire body sleeving the hub, an air cock extending into the corresponding tire body is arranged on each hub, each tire body comprises a cover tire surface, an anti-explosion layer, a reinforcing layer and a tire part which are sequentially adhered to form a whole body from the outer side to the inner side, six rubber bodies extending to the circle center of the hub are uniformly arranged along the circumference of the inner side of each tire body, gaps are formed between each of the six rubber bodies and the corresponding hub, and a buffer device is arranged at the front end of the two bearing frames. When the electrical cabinet trolley is used for transporting electrical cabinets, the electrical cabinets are prevented from turning on one side, and the security is high; no extra persons assisting in pushing and pulling the electrical cabinets are needed, and thus the construction efficiency is enhanced; the electrical cabinet trolley has anti-collision and risk-protection functions as well as a tire burst prevention function.

The invention provides a kind of automobile collision energy-absorbing box, comprising: an upper flange, a composite shell, an inner filler, a circular platform inner tube and a lower flange; the upper part of the composite shell is a square box, and each square box Five defect holes are arranged on the side along the diagonal; the lower part of the composite shell is a platform bellows, and its side edge is a sinusoidal corrugated structure; the circular platform inner tube is arranged in the composite shell, and the internal filler It is filled between the inner tube of the round table and the inner wall of the composite shell; the filling between the square box and the inner tube of the round table is a honeycomb structure, and the filling between the bellows of the table body and the inner tube of the round table is a lattice structure. The above-mentioned energy-absorbing box for automobiles has high energy-absorbing stability and good energy-absorbing effect.

The invention relates to the technical field of new energy vehicles, in particular to a rear anti-collision beam energy absorption box and a design method thereof. A rear anti-collision beam energy absorption box is characterized in that the rear sides of the left end and the right end of a rear anti-collision beam are connected with a left energy absorption box assembly and a right energy absorption box assembly respectively, the lower portion of a left energy absorption box upper plate is connected with a left energy absorption box lower plate, and the rear sides of the left energy absorption box upper plate and the left energy absorption box lower plate are connected with a left energy absorption box sealing plate; a right energy absorption box lower plate is connected to the lower portion of the right energy absorption box upper plate, a right energy absorption box sealing plate is connected to the rear sides of the right energy absorption box upper plate and the right energy absorption box lower plate, a tow hook reinforcing plate is embedded between the right energy absorption box upper plate and the right energy absorption box lower plate, and the middle of the tow hook reinforcing plate is connected with a tow hook threaded sleeve through threads. Compared with the prior art, the rear anti-collision beam energy absorption box and the design method thereof have the advantages that compared with a traditional anti-collision beam energy absorption box, the rear anti-collision beam energy absorption box is better in safety performance, light in weight, more stable in energy absorption, simple in production and manufacturing process, low in cost and wide in applicability.

The invention discloses a vehicle-body energy absorbing device and method. The vehicle-body energy absorbing device and method aim at solving problems existing in the prior art, and a novel energy absorbing structure and a flowable flexible colloidal material are adopted. Energy is absorbed by changing the physical properties and state of the energy absorbing material, and the impact energy generated by collision is absorbed through flow resistance of colloid. The vehicle-body energy absorbing device is provided with a set of movable parts which are connected and can relatively slide and a sealing cavity, and the sealing cavity is filled with solid energy-absorbing colloid; the sealing cavity is communicated with a colloid recycling cavity through a plurality of flow discharge holes for the directional flow of the solid energy-absorbing colloid; when the solid energy-absorbing colloid is squeezed, the solid energy-absorbing colloid can flow from the sealing cavity to the recycling cavity through the flow discharge holes.

The invention provides a crash energy absorbing and anti-falling structure of a steering column. The structure comprises a mounting bracket which is fixed on a vehicle body and covers an upper columnpipe, and a clamping block which is fixed on the upper column pipe and is opposite to the position of the mounting bracket, symmetrical sliding grooves are formed in the two sides of the clamping block in the axial direction of the upper column pipe, a handle shaft transversely penetrating through the sliding grooves is arranged on the mounting bracket, extending grooves are formed in the front ends of the sliding grooves, and breakable steel belts are arranged in the extending grooves respectively. The end, facing the sliding groove, of each steel belt is a wedge-shaped end; and a wedge-shaped block matched with the wedge-shaped end is convexly arranged on the handle shaft. The crash peak force and the continuous force of the steering column can be well controlled through the breakable steel belts, stable energy absorption is achieved, and harm to a driver during collision is reduced; and the handle shaft of the mounting bracket fixed on the vehicle body transversely penetrates through the sliding groove of the clamping block, and the steel belts can be collapsed and deformed along the extending grooves after collision, so that the steering column can be effectively prevented fromfalling, and the steering column is ensured to still have steering capacity after collapsing.

The invention discloses a cutting energy-absorbing mechanism for a passenger car. The cutting energy-absorbing mechanism for the passenger car comprises a spline shaft, a spline sleeve, a fixing sleeve and a baffle. The spline shaft is arranged in the spline sleeve in a fit and interfered mode. The spline sleeve is movably arranged in the fixing sleeve in a nested mode. The baffle is fixedly arranged on the rear end of the fixing sleeve. The rear end of the spline shaft is fixedly connected with a front wall arc rod of the passenger car. The fixing sleeve is fixedly connected with an upright post of a passenger car steering table. According to the cutting energy-absorbing mechanism for the passenger car, it is guaranteed that a steering column mounting table can absorb partial energy in the frontal impact process( that is, partial kinetic energy produced by the collision can be transformed into heat energy and deformation energy in the process of the spline shaft cutting the spline sleeve), the energy-absorbing is stable, the stiffness and strength of a steering table body can be enhanced, and at the same time, the problems of the vibration of a steering wheel and the like are solved.

The invention discloses a coupler buffering and energy-absorbing device of a rail transit vehicle. The energy-absorbing device comprises a traction rod and a pull rod; the pull rod is connected with the traction rod through a guide rod, and an expansion block is arranged at the end, facing the coupler tailstock, of the traction rod. A crushing pipe is arranged outside the guide rod in a sleeving mode, one end of the crushing pipe abuts against one end face of the pull rod, and the other end of the crushing pipe forms a slope ring abutting against the expansion block; the end, close to the pullrod, of the guide rod is provided with a supporting table, and the outer circumferential face of the supporting table is attached to the inner wall face of the crushing pipe. The crushing pipe comprises two or more layers of thin-walled pipes which are arranged in a sleeved mode. According to the energy-absorbing device, the collision energy absorption capacity of the crushing pipe is improved, and the energy absorption behavior is optimized.

The invention discloses a composite pipe with gradually varied axial strength. The composite pipe comprises an inner sealing layer (1), a middle layer (2) and an outer sealing layer (3) and is characterized in that the middle layer (2) is arranged between the inner sealing layer (1) and the outer sealing layer (3), each of the inner sealing layer (1) and the outer sealing layer (3) independently crosses or independently unidirectionally intertwines to form a radial sealing layer, and the middle layer (2) independently crosses or independently unidirectionally intertwines to form an axial structural layer. The composite pipe is gradually varied in axial strength, stable in crushing deformation, low in impact load peak and high in energy absorption efficiency.

The present invention disclosed the front -end structure of the rail vehicle.The front -end structure of the vehicle includes the body body, the front -end structure of the chain, the driver's room skeleton and the anti -climber;The front end of the driver's room floor has a collision wall, which is fixed at the front end of the collision wall;In order to hook the system's energy -absorbing area, anti -climber energy absorbing area, vehicle body first -level deformation absorption area, car body secondary deformation energy absorption zone, and car body body; when the vehicle collides, the hook slow system absorption energy absorption energy absorption energy absorption energy absorption energy absorption energyArea, anti -climber -absorbing zone, first -level deformation absorption zone, and second -level deformation absorption zone of the car body occur in turn.The present invention can ensure the driver's living space at the time of the accident.

The invention discloses a rail train energy absorption device with high energy absorption rate, which comprises an outer cylinder, an inner cylinder, a primary energy absorption mechanism and a secondary energy absorption mechanism, and is characterized in that the inner cylinder is inserted into the outer cylinder in a sliding manner; the first-stage energy absorption mechanism comprises a plastic square pipe, an expansion conical head and a contact piece; the size of the second-stage energy absorption mechanism can be compressed, and the second-stage energy absorption mechanism is arranged in the outer cylinder. The first-stage energy absorption mechanism has the beneficial effects that the first-stage energy absorption mechanism absorbs energy through the pipe body plastic deformation capacity and friction force generated in the thin-walled pipe expansion process, the speed influence is avoided, and stable energy absorption can be achieved in various collision scenes. Meanwhile, the first-stage energy absorption mechanism generates energy for expansion of the inner thin-walled pipe, the expanded thin wall is tightly attached to the inner wall of the inner cylinder, vertical force is effectively supported, the energy absorption structure has higher vertical load resistance, the risk of structural failure caused by the fact that the front end is too long and the vertical force is borne in the collision process is reduced, and the service life of the energy absorption structure is prolonged. And orderliness and effectiveness of the energy absorption process are ensured.

The invention provides a cylindrically laminated stainless steel fiber porous material and an energy absorption compound pipe. The porous material is prepared from the method which comprises the following steps: crocheting a stainless steel base material to obtain a single-layered metal porous sheet, wherein the stainless steel base material is selected from a single-bundle continuous stainless steel fiber bundle, a single-bundle continuous soft stainless steel wire with the diameter of 0.2 to 1.0 mm or a single-bundle continuous ultrathin soft stainless steel rope with the diameter of 0.2 to0.8 mm; and winding and wrapping the single-layered metal porous sheet to be cylindrically laminated, carrying out vacuum sintering for 2 to 3.5 h at the temperature of 1100 to 1330 DEG C, and carrying out furnace cooling to obtain the cylindrically laminated stainless steel fiber porous material with the porosity of 60% to 90%. The stainless steel base material is crocheted and is wound and wrapped to be cylindrically laminated, and then vacuum sintering is carried out, so that the cylindrically laminated stainless steel fiber porous material with the porosity of 60% to 90% is obtained. The material is low in preparation method, and when a metal thin wall tube is filled with the metal, under the condition that the squashing peak value is hardly increased, the material has more stable energy absorption process and higher energy absorption capacity.

The invention discloses an efficient, stable and collision-resistant automobile energy absorption box. The efficient, stable and collision-resistant automobile energy absorption box comprises an energy absorption box body, a plurality of energy absorption units and flat plates, wherein the energy absorption box body is filled with the energy absorption units, and the flat plates are arranged between every two adjacent energy absorption units; the energy absorption unit comprises a first energy absorption unit and a second energy absorption unit; the first energy absorption unit is of a spiral structure with multiple holes, the second energy absorption unit comprises a plurality of transverse cylinders arranged transversely and a plurality of longitudinal cylinders arranged longitudinally, and the transverse cylinders and the longitudinal cylinders are correspondingly filled in the holes of the first energy absorption unit in an orthogonal layering mode to form the energy absorption unit. The first energy absorption units generate large deformation to diffuse impact energy when bearing pressure, the second energy absorption units can bear axial and radial pressure at the same time, and the energy absorption box is prevented from being damaged when impacted at different angles.

The invention provides a cylindrically laminated stainless steel fiber porous material and an energy absorption compound pipe. The porous material is prepared from the method which comprises the following steps: crocheting a stainless steel base material to obtain a single-layered metal porous sheet, wherein the stainless steel base material is selected from a single-bundle continuous stainless steel fiber bundle, a single-bundle continuous soft stainless steel wire with the diameter of 0.2 to 1.0 mm or a single-bundle continuous ultrathin soft stainless steel rope with the diameter of 0.2 to0.8 mm; and winding and wrapping the single-layered metal porous sheet to be cylindrically laminated, carrying out vacuum sintering for 2 to 3.5 h at the temperature of 1100 to 1330 DEG C, and carrying out furnace cooling to obtain the cylindrically laminated stainless steel fiber porous material with the porosity of 60% to 90%. The stainless steel base material is crocheted and is wound and wrapped to be cylindrically laminated, and then vacuum sintering is carried out, so that the cylindrically laminated stainless steel fiber porous material with the porosity of 60% to 90% is obtained. The material is low in preparation method, and when a metal thin wall tube is filled with the metal, under the condition that the squashing peak value is hardly increased, the material has more stable energy absorption process and higher energy absorption capacity.

The invention relates to a high-integration automobile roof with a low-peak-value energy absorption structure. The high-integration automobile roof comprises a roof outer board, a low-peak-value energy absorption structural layer and a trim panel. The low-peak-value energy absorption structural layer is of a stereoscopic structure composed of multiple unit cell bodies sequentially arranged and combined in the X direction. Each unit cell body is composed of inward-recessed quadrangular energy absorption parts evenly arranged at intervals from top to bottom and connecting boards used for connecting every two adjacent inward-recessed quadrangular energy absorption parts. Each inward-recessed quadrangular energy absorption part comprises two first transverse energy absorption parts symmetrically arranged in the horizontal direction, two second transverse energy absorption parts arranged symmetrically relative to the first transverse energy absorption parts in the vertical direction, two first vertical energy absorption parts symmetrically arranged in the horizontal direction, and two second vertical energy absorption parts arranged symmetrically relative to the first vertical energy absorption parts in the vertical direction. The roof is low in collision initial peak value, stable in energy absorption process, good in energy absorption effect and capable of guaranteeing safety andcomfort at the same time.