CN204821430U - Solid coupling collision energy -absorbing device of gradual gas -liquid of pyatyi - Google Patents
Solid coupling collision energy -absorbing device of gradual gas -liquid of pyatyi Download PDFInfo
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- CN204821430U CN204821430U CN201520180603.4U CN201520180603U CN204821430U CN 204821430 U CN204821430 U CN 204821430U CN 201520180603 U CN201520180603 U CN 201520180603U CN 204821430 U CN204821430 U CN 204821430U
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- foamed aluminium
- cylindrical shell
- column foamed
- column
- straight beam
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Abstract
The utility model provides a solid coupling collision energy -absorbing device of gradual gas -liquid of pyatyi, the device's barrel is by first sealed piston, air chjamber and hydraulic pressure room that the sealed piston of second is cut apart constitute, the indoor throttle plate of establishing of hydraulic pressure, the sealed piston of second is kept away from hydraulic pressure room orientation one side and is fixed with buffer spring and first column foamed aluminium, first column foamed aluminium lies in the straight beam, the buffer spring other end stretches out and fixes on the bearing plate in the straight beam, be equipped with on the bearing plate with the relative second column foamed aluminium of first column foamed aluminium straight line, second column foamed aluminium is kept away from bearing plate one end and is stretched into in the straight beam, and at the spring under the no elastic deformation, first column foamed aluminium separates with second column foamed aluminium each other, first column foamed aluminium is with second column foamed aluminium straight length and be greater than straight beam length. The utility model discloses an energy absorption that strengthens step by step progressively absorbs and cushions the impact energy to fine improvement car collision security performance.
Description
Technical field
The utility model belongs to Vehicular device, particularly relates to the gradual gas-liquid-solid coupling collision energy-absorbing device of a kind of Pyatyi.
Background technology
Along with the fast development of auto-industry, the traffic accident thereupon brought also becomes a serious social concern.Frontal crash of vehicles accident and the personal casualty caused thereof are that in all collision forms, fatal rate is the highest always.But pursue the main flow that lightweight has become current automobile design, so the front space of current automobile is subject to many compressions, be more difficult to reach good collision safety performance.Federal bumper is occupant safety protected to greatest extent by automobile vitals when colliding, and its main composition comprises crossbeam and is connected to the energy absorber between crossbeam and car body adapter plate.Energy absorber fully absorbs impact kinetic energy to reduce maximum impact when automobile is subject to clashing into its compressive deformation, plays the parts of buffering energy-absorbing, so the energy-absorbing effect of energy absorber decides the safety of occupant to a great extent.
The impact protection apparatus that Chinese patent CN00224934.0 provides; form by three layers of concentric steel pipe is nested against one another; hydraulic pressure is had in compound steel pipe; air pressure, the shock absorber of spring composition, is shunk in opposite directions by middle level steel pipe; hydraulic oil promotes spring-compressed; back down compressed gas thimble, due to elastic force and other the compression of spring, thus damp impacts energy.Although this device has three kinds of energy-absorbing modes, hydraulic oil and air seal difficulty, the effect that can play in practical function is not ideal enough, and the plastic deformation finally mainly through material reaches energy-absorbing effect.
The impact protection apparatus that Chinese patent CN101801757A provides; for straight beam structure; by the composition nested against one another of two steel pipes; the energy absorbing tube of this device is positioned at the afterbody of device; and length is less; can not reach good energy-absorbing effect, and device does not have buffer structure, cannot flexible buffer collision energy.
Utility model content
The purpose of this utility model is to provide a kind of Pyatyi gradual gas-liquid-solid coupling collision energy-absorbing device, be intended to solve existing energy absorption device energy-absorbing effect bad, cannot the problem such as flexible buffer collision energy.
The utility model is achieved in that the gradual gas-liquid-solid coupling collision energy-absorbing device of a kind of Pyatyi, comprises bearing plate, the hollow straight beam of both ends open, cylindrical shell; Wherein, described cylindrical shell one end closes, and the other end docks with hollow straight beam one open end rigidity; Described cylindrical shell is provided with the first packed-piston successively by closing end to other end direction, with the throttle disk of cutoff port, and the second packed-piston; Form air-pressure chamber after blanketing gas between described cylindrical shell closing end and the first packed-piston, filling liquid force feed between the first packed-piston and the second packed-piston also forms hydraulic pressure chamber, establishes throttle disk in described hydraulic pressure chamber;
Described second packed-piston is fixed with recoil spring and the first column foamed aluminium away from side, hydraulic pressure chamber direction, described first column foamed aluminium is positioned at straight beam, the described recoil spring other end stretches out and is fixed on bearing plate in straight beam, described bearing plate is provided with the second column foamed aluminium relative with described first column foamed aluminium straight line, described second column foamed aluminium stretches in straight beam away from bearing plate one end, and at spring under nonelastic deformation, described first column foamed aluminium and the second column foamed aluminium are spaced;
Described first column foamed aluminium and the second column foamed aluminium straight length and be greater than straight beam length.
Preferably, described cylindrical shell is made up of large aperture cylindrical shell and small-bore cylindrical shell, and cylindrical shell one end, described small-bore closes, and the other end docks with one end of large aperture cylindrical shell, and the described large aperture cylindrical shell other end docks with one end rigidity of hollow straight beam;
Extremely the first packed-piston and throttle disk is provided with successively with direction, cylindrical shell butt end, large aperture by closing end in the cylindrical shell of described small-bore; The second packed-piston is provided with in the cylindrical shell of described large aperture.
Preferably, the joint between described small-bore cylindrical shell and large aperture cylindrical shell is set to and narrows passage, described in narrow passage sectional area be all less than the sectional area of small-bore cylindrical shell and large aperture cylindrical shell.
Preferably, described small-bore cylindrical shell is located at above the gravity of large aperture cylindrical shell.
Preferably, described closing end is provided with charging valve; Described blanketing gas is nitrogen.
Preferably, described first column foamed aluminium is made up of some column foamed aluminiums, and symmetrical centered by spring;
Described second column foamed aluminium is made up of some column foamed aluminiums, and symmetrical centered by spring;
Straight line is relative one by one for each column foamed aluminium in described first column foamed aluminium and each column foamed aluminium in the second column foamed aluminium.
Preferably, described straight beam is that cross section comprises hexagon, octagon, square and circular.
Preferably, described straight beam, spring and the coaxial heart of large aperture cylindrical shell; The cross section maximum gauge of described straight beam is less than the aperture of large aperture cylindrical shell.
The utility model provides Pyatyi gradual gas-liquid-solid coupling collision energy-absorbing device, and this device comprises bearing plate, the hollow straight beam of both ends open, cylindrical shell, cylindrical shell is by the first packed-piston, the air-pressure chamber that second packed-piston is divided into and hydraulic pressure chamber are formed, throttle disk is established in hydraulic pressure chamber, second packed-piston is fixed with recoil spring and the first column foamed aluminium away from side, hydraulic pressure chamber direction, first column foamed aluminium is positioned at straight beam, the recoil spring other end stretches out and is fixed on bearing plate in straight beam, bearing plate is provided with the second column foamed aluminium relative with the first column foamed aluminium straight line, second column foamed aluminium stretches in straight beam away from bearing plate one end, and at spring under nonelastic deformation, first column foamed aluminium and the second column foamed aluminium are spaced, first column foamed aluminium and the second column foamed aluminium straight length and be greater than straight beam length.This application of installation on automobile to improve Crash Safety Design of Vehicles energy.
Compared to the shortcoming and defect of prior art, the utility model has following beneficial effect: the utility model is connected by carrying out elasticity by the gradual gas-liquid-solid coupling collision energy-absorbing device of Pyatyi between Federal bumper with crossbeam, the gradual gas-liquid-solid coupling collision energy-absorbing device of this Pyatyi is by spring energy-absorbing, hydraulic energy absorption, air pressure energy-absorbing, filling energy-absorbing material energy-absorbing and distortion energy-absorbing, five kinds of energy-absorbing modes are applied in device, by the energy absorption strengthened step by step, progressively absorb and cushion collision energy, thus well ensureing the personal safety of passenger inside the vehicle.
Accompanying drawing explanation
Fig. 1 is that the gradual gas-liquid-solid coupling collision energy-absorbing device of the utility model Pyatyi is arranged on the elevation cross-sectional view after on automobile;
Fig. 2 is the gradual gas-liquid-solid coupling collision energy-absorbing device of the utility model Pyatyi structural representation in the uncompressed state;
Fig. 3 is the gradual gas-liquid-solid coupling collision energy-absorbing device of the utility model Pyatyi structural representation under compression;
Fig. 4 is the structural representation of throttle disk in the gradual gas-liquid-solid coupling collision energy-absorbing device of the utility model Pyatyi.
Detailed description of the invention
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
As shown in figures 1-4, wherein, Fig. 1 is that the gradual gas-liquid-solid coupling collision energy-absorbing device of the utility model Pyatyi is arranged on the elevation cross-sectional view after on automobile; Fig. 2 is the gradual gas-liquid-solid coupling collision energy-absorbing device of the utility model Pyatyi structural representation in the uncompressed state; Fig. 3 is the gradual gas-liquid-solid coupling collision energy-absorbing device of the utility model Pyatyi structural representation under compression; Fig. 4 is the structural representation of throttle disk in the gradual gas-liquid-solid coupling collision energy-absorbing device of the utility model Pyatyi.
The gradual gas-liquid-solid coupling collision energy-absorbing device of a kind of Pyatyi, comprises bearing plate 1, the hollow straight beam 12 of both ends open, cylindrical shell; Wherein, described cylindrical shell one end closes, and the other end docks with hollow straight beam 12 1 open end rigidity; Described cylindrical shell is provided with the first packed-piston 8 successively by closing end to other end direction, with the throttle disk 7 of cutoff port, and the second packed-piston 5; Blanketing gas between described cylindrical shell closing end and the first packed-piston 8 also forms air-pressure chamber 9, and filling liquid force feed between the first packed-piston 8 and the second packed-piston 5 also forms hydraulic pressure chamber 6, establishes throttle disk 7 in described hydraulic pressure chamber 6;
Described second packed-piston 5 is fixed with recoil spring 4 and the first column foamed aluminium 3 away from side, hydraulic oil direction, described first column foamed aluminium 3 is positioned at straight beam 10, described recoil spring 4 other end stretches out and is fixed on bearing plate 1 in straight beam 10, described bearing plate 1 is provided with the second column foamed aluminium 2 relative with described first column foamed aluminium 3 straight line, described second column foamed aluminium 2 stretches in straight beam 10 away from bearing plate 1 one end, and at spring 4 under nonelastic deformation, described first column foamed aluminium 3 and the second column foamed aluminium 2 are spaced;
Described first column foamed aluminium 3 and the second column foamed aluminium 2 straight length and be greater than straight beam 10 length.
In the utility model, by described bearing plate 1 is fixed on Federal bumper 11, described cylindrical shell is fixed on vehicle beam 12, when automobile collides, absorbs collision energy by the gradual gas-liquid-solid coupling collision energy-absorbing device of this Pyatyi.
In the utility model embodiment, bearing plate 1 of the present utility model is steel plate, and the first column foamed aluminium 3, second column foamed aluminium 2 is energy-absorbing material, and this energy-absorbing material is not limited to foamed aluminium material, is filled in straight beam 10.Quantity and the size of the first column foamed aluminium 3, second column foamed aluminium 2 are arranged according to actual needs, when quantity is more, symmetrical centered by spring 4.Straight beam 10 for cross section be the cylinder in hexagon, octagon, square and the regular face such as circular, thickness of column and the material of straight beam 10 design according to actual conditions, generally, be irony thin-walled, can be advisable by compressive deformation under impacting with crossbeam 12 limit at the bumper/spoiler 11 of automobile.Throttle disk 7 of the present utility model is circular slab, according to the mode hollow out annulus of decile.
In actual application of the present utility model, after first Federal bumper 11 is clashed into, bearing plate 1 Compress Spring 4, spring 4 forms first order energy-absorbing after there is elastic deformation, i.e. spring energy-absorbing.Impact is transmitted on the second packed-piston 5 by spring 4, hydraulic oil compresses by the second packed-piston 5, in compression process, hydraulic oil is by throttle disk 7, throttle disk 7 controls flow rate of liquid, hydraulic oil, distributing by making a large amount of collision energy convert heat energy to by the effect of liquid and throttle disk 7 during throttle disk 7, forms second stage energy-absorbing, i.e. hydraulic energy absorption.
Hydraulic oil is by after throttle disk 7, and because hydraulic pressure chamber 6 is connected with air-pressure chamber 9, the hydraulic oil in hydraulic pressure chamber 6 directly arrives air-pressure chamber 9, to the first packed-piston 8 applied pressure, in first packed-piston 8 pairs air-pressure chamber 9, gas compresses, and forms third stage energy-absorbing, i.e. air pressure energy-absorbing.Now, hydraulic energy absorption and air pressure energy-absorbing almost play buffer action simultaneously.
If the dynamics of shock is very powerful, on the basis of above three grades of energy-absorbings, spring 4 is compressed to the limit, now, due to the first column foamed aluminium 3 and the second column foamed aluminium 2 straight length be greater than straight beam 10 length, be positioned at the first column foamed aluminium 3 in straight line relative direction and the second column foamed aluminium 2 holds each other, now, application force between first column foamed aluminium 3 and the second column foamed aluminium 2 forms fourth stage energy-absorbing, namely fills energy-absorbing material energy-absorbing.
When impact reaches capacity, after first column foamed aluminium 3 and the second column foamed aluminium 2 crush each other, the end immediate roof of straight beam 10 has been held on bearing plate 1, now, after acting between straight beam 10 and bearing plate 1, because straight beam 10 is thin-wall part, in the end collision energy is excessive, and all energy-absorbing modes fail to absorb whole collision energy, and the buffering produced by straight beam 10 self-deformation forms level V energy-absorbing, namely be out of shape energy-absorbing, absorb huge energy.
The utility model is connected by carrying out elasticity by the gradual gas-liquid-solid coupling collision energy-absorbing device of Pyatyi between Federal bumper 11 with crossbeam 12, the gradual gas-liquid-solid coupling collision energy-absorbing device of this Pyatyi is by spring energy-absorbing, hydraulic energy absorption, air pressure energy-absorbing, filling energy-absorbing material energy-absorbing and distortion energy-absorbing, five kinds of energy-absorbing modes are applied in device, by the energy absorption strengthened step by step, progressively absorb and cushion collision energy, thus well ensureing the personal safety of passenger inside the vehicle.
In further implementation process, in order to improve the effect of hydraulic energy absorption further, in the utility model embodiment, described cylindrical shell is made up of large aperture cylindrical shell and small-bore cylindrical shell, cylindrical shell one end, described small-bore closes, the other end docks with one end of large aperture cylindrical shell, and the described large aperture cylindrical shell other end docks with one end rigidity of hollow straight beam 10;
Extremely the first packed-piston 8 and throttle disk 7 is provided with successively with direction, cylindrical shell butt end, large aperture by closing end in the cylindrical shell of described small-bore; The second packed-piston 5 is provided with in the cylindrical shell of described large aperture.
In the actual application of the utility model embodiment, by above setting, hydraulic pressure chamber 6 is divided into small one and large one two hydraulic pressure chambers, little hydraulic pressure chamber is in the cylindrical shell of small-bore, and large hydraulic pressure chamber is in the cylindrical shell of large aperture.Under the promotion of the second packed-piston 5, hydraulic oil is entered in the process of little hydraulic pressure chamber by large hydraulic pressure chamber, and passage narrows, and can control fluid flow, improves energy-absorbing buffering effect.
In further implementation process, in order to better improve the energy-absorbing buffering effect of hydraulic pressure chamber 6, more specifically, the joint between described small-bore cylindrical shell and large aperture cylindrical shell is set to and narrows passage, described in narrow passage sectional area be all less than the sectional area of small-bore cylindrical shell and large aperture cylindrical shell.That is, by the expanding channels that a sectional area is very little between little hydraulic pressure chamber and large hydraulic pressure chamber, liquid enters little hydraulic pressure chamber by this passage, and energy-absorbing buffering effect is more outstanding.
In further implementation process, after ensureing that impact disappears, the gradual gas-liquid-solid coupling collision energy-absorbing device of whole Pyatyi can recover automatically, and in the utility model embodiment, described small-bore cylindrical shell is located at above the gravity of large aperture cylindrical shell.
In the utility model embodiment, due to the self-deformation of spring 4, other link automatic homings can be ensured.And above gravity small-bore cylindrical shell being located at large aperture cylindrical shell after, the hydraulic oil in hydraulic pressure chamber 6 by little hydraulic pressure chamber automatic back flow in large hydraulic pressure chamber.
In further implementation process, in order to buffering effect and the dynamics of better adjustable pressure room 9, in the utility model embodiment, the closing end of described cylindrical shell is provided with charging valve.In actual application of the present utility model, can be filled with desired gas by this charging valve, in the utility model embodiment, described blanketing gas is nitrogen.In addition, buffering dynamics size should be born according to air-pressure chamber 9, determine the pressure size being filled with desired gas by this charging valve toward air-pressure chamber 9.
In further implementation process, in order to ensure stability under loading and the harmony of whole device, in the utility model embodiment, described first column foamed aluminium 3 is made up of some column foamed aluminiums, and symmetrical centered by spring; Described second column foamed aluminium 2 is made up of some column foamed aluminiums, and symmetrical centered by spring 4; Straight line is relative one by one for each column foamed aluminium in described first column foamed aluminium 3 and each column foamed aluminium in the second column foamed aluminium 2.In addition, in the utility model embodiment, straight beam 10, spring 4 and the coaxial heart of large aperture cylindrical shell.
In the actual application of the utility model embodiment, because straight beam 10 is symmetrical structure, and the first column foamed aluminium 3, second column foamed aluminium 2 is also symmetrical centered by spring 4, straight beam 10, spring 4 and the coaxial heart of large aperture cylindrical shell, therefore, the structure stress that bearing plate 1, straight beam 10, second packed-piston 5, spring 4, first column foamed aluminium 3, second column foamed aluminium 2 are formed evenly, device is more firm, durable.
In further implementation process, in order to effectively avoid the second packed-piston 5 to enter into straight beam 10, cause the hydraulic oil in hydraulic pressure chamber 6 to be revealed, in the utility model embodiment, the cross section maximum gauge of described straight beam 10 is less than the aperture of large aperture cylindrical shell.Now, even if air-pressure chamber 9, hydraulic pressure chamber 6 internal pressure are large again, because straight beam 10 is to the position-limiting action of the second packed-piston 5, actv. avoids the second packed-piston 5 and deviates from from cylindrical shell, ensure that the good air-tightness of air-pressure chamber 9, hydraulic pressure chamber 6, device quality is more secure.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all do within spirit of the present utility model and principle any amendment, equivalent to replace and improvement etc., all should be included within protection domain of the present utility model.
Claims (8)
1. the gradual gas-liquid-solid coupling collision energy-absorbing device of Pyatyi, is characterized in that, comprise bearing plate, the hollow straight beam of both ends open, cylindrical shell; Wherein, described cylindrical shell one end closes, and the other end docks with hollow straight beam one open end rigidity; Described cylindrical shell is provided with the first packed-piston successively by closing end to other end direction, with the throttle disk of cutoff port, and the second packed-piston; Form air-pressure chamber after blanketing gas between described cylindrical shell closing end and the first packed-piston, filling liquid force feed between the first packed-piston and the second packed-piston also forms hydraulic pressure chamber, establishes throttle disk in described hydraulic pressure chamber;
Described second packed-piston is fixed with recoil spring and the first column foamed aluminium away from side, hydraulic pressure chamber direction, described first column foamed aluminium is positioned at straight beam, the described recoil spring other end stretches out and is fixed on bearing plate in straight beam, described bearing plate is provided with the second column foamed aluminium relative with described first column foamed aluminium straight line, described second column foamed aluminium stretches in straight beam away from bearing plate one end, and at spring under nonelastic deformation, described first column foamed aluminium and the second column foamed aluminium are spaced;
Described first column foamed aluminium and the second column foamed aluminium straight length and be greater than straight beam length.
2. the gradual gas-liquid-solid coupling collision energy-absorbing device of Pyatyi as claimed in claim 1, it is characterized in that, described cylindrical shell is made up of large aperture cylindrical shell and small-bore cylindrical shell, cylindrical shell one end, described small-bore closes, the other end docks with one end of large aperture cylindrical shell, and the described large aperture cylindrical shell other end docks with one end rigidity of hollow straight beam;
Extremely the first packed-piston and throttle disk is provided with successively with direction, cylindrical shell butt end, large aperture by closing end in the cylindrical shell of described small-bore; The second packed-piston is provided with in the cylindrical shell of described large aperture.
3. the gradual gas-liquid-solid coupling collision energy-absorbing device of Pyatyi as claimed in claim 2, it is characterized in that, joint between described small-bore cylindrical shell and large aperture cylindrical shell is set to and narrows passage, described in narrow passage sectional area be all less than the sectional area of small-bore cylindrical shell and large aperture cylindrical shell.
4. the gradual gas-liquid-solid coupling collision energy-absorbing device of Pyatyi as claimed in claim 3, it is characterized in that, described small-bore cylindrical shell is located at above the gravity of large aperture cylindrical shell.
5. the gradual gas-liquid-solid coupling collision energy-absorbing device of Pyatyi as claimed in claim 4, it is characterized in that, described closing end is provided with charging valve; Described blanketing gas is nitrogen.
6. the gradual gas-liquid-solid coupling collision energy-absorbing device of Pyatyi as claimed in claim 2, it is characterized in that, described first column foamed aluminium is made up of some column foamed aluminiums, and symmetrical centered by spring;
Described second column foamed aluminium is made up of some column foamed aluminiums, and symmetrical centered by spring;
Straight line is relative one by one for each column foamed aluminium in described first column foamed aluminium and each column foamed aluminium in the second column foamed aluminium.
7. the gradual gas-liquid-solid coupling collision energy-absorbing device of Pyatyi as claimed in claim 6, is characterized in that, described straight beam is that cross section comprises hexagon, octagon, square and circular; Described straight beam, spring and the coaxial heart of large aperture cylindrical shell.
8. the gradual gas-liquid-solid coupling collision energy-absorbing device of Pyatyi as claimed in claim 7, it is characterized in that, the cross section maximum gauge of described straight beam is less than the aperture of large aperture cylindrical shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520180603.4U CN204821430U (en) | 2015-03-29 | 2015-03-29 | Solid coupling collision energy -absorbing device of gradual gas -liquid of pyatyi |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520180603.4U CN204821430U (en) | 2015-03-29 | 2015-03-29 | Solid coupling collision energy -absorbing device of gradual gas -liquid of pyatyi |
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| Publication Number | Publication Date |
|---|---|
| CN204821430U true CN204821430U (en) | 2015-12-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520180603.4U Withdrawn - After Issue CN204821430U (en) | 2015-03-29 | 2015-03-29 | Solid coupling collision energy -absorbing device of gradual gas -liquid of pyatyi |
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|---|---|
| CN (1) | CN204821430U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104999977A (en) * | 2015-03-29 | 2015-10-28 | 厦门理工学院 | Five-level gradual-type gas-liquid-solid coupling collision energy absorption device and application |
| CN106427846A (en) * | 2016-11-17 | 2017-02-22 | 华南理工大学 | Multi-stage buffer energy-absorbing type automobile bumper device |
| CN113685208A (en) * | 2021-07-14 | 2021-11-23 | 东北大学 | Fluid-solid coupling type multistage energy-absorbing impact-resisting hydraulic upright column and working method thereof |
-
2015
- 2015-03-29 CN CN201520180603.4U patent/CN204821430U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104999977A (en) * | 2015-03-29 | 2015-10-28 | 厦门理工学院 | Five-level gradual-type gas-liquid-solid coupling collision energy absorption device and application |
| CN104999977B (en) * | 2015-03-29 | 2017-09-29 | 厦门理工学院 | A kind of gradual gas-liquid-solid coupling collision energy-absorbing device of Pyatyi |
| CN106427846A (en) * | 2016-11-17 | 2017-02-22 | 华南理工大学 | Multi-stage buffer energy-absorbing type automobile bumper device |
| CN113685208A (en) * | 2021-07-14 | 2021-11-23 | 东北大学 | Fluid-solid coupling type multistage energy-absorbing impact-resisting hydraulic upright column and working method thereof |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20151202 Effective date of abandoning: 20170929 |
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| AV01 | Patent right actively abandoned |