CN106763455B - A kind of pneumatic spring variable-damp vibration damper assembly to generate electricity - Google Patents

A kind of pneumatic spring variable-damp vibration damper assembly to generate electricity Download PDF

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Publication number
CN106763455B
CN106763455B CN201611137021.3A CN201611137021A CN106763455B CN 106763455 B CN106763455 B CN 106763455B CN 201611137021 A CN201611137021 A CN 201611137021A CN 106763455 B CN106763455 B CN 106763455B
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CN
China
Prior art keywords
vibration damper
damper assembly
piston
air bag
generate electricity
Prior art date
Application number
CN201611137021.3A
Other languages
Chinese (zh)
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CN106763455A (en
Inventor
兰志强
金国贤
Original Assignee
上乘精密科技(苏州)有限公司
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Publication date
Application filed by 上乘精密科技(苏州)有限公司 filed Critical 上乘精密科技(苏州)有限公司
Priority to CN201611137021.3A priority Critical patent/CN106763455B/en
Publication of CN106763455A publication Critical patent/CN106763455A/en
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Publication of CN106763455B publication Critical patent/CN106763455B/en

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16FSPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F13/00Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs
    • F16F13/002Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising at least one fluid spring
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16FSPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F13/00Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs
    • F16F13/04Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper
    • F16F13/26Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper characterised by adjusting or regulating devices responsive to exterior conditions
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K7/00Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/18Structural association of electric generators with mechanical driving motors, e.g. turbine

Abstract

The invention discloses the pneumatic spring variable-damp vibration damper assemblies that one kind can generate electricity, the damping changing impact damper ontology that can be generated electricity including one, possess the function of self-generating, and the power storage of generation can be got up, also have a lead-out wire, it is connect by lead-out wire with vehicle control device, provides electric energy for vehicle.With this configuration, good damping effect can be provided and can be produced electricl energy in the case where not needing and damping work greatly, the electrical equipment in power storage or supply vehicle can be saved for user by the energy by circuit control.

Description

A kind of pneumatic spring variable-damp vibration damper assembly to generate electricity

Technical field

The present invention relates to the pneumatic spring variable-damp vibration damper assemblies that one kind can generate electricity, and belong to the damper knot on automobile Structure technical field.

Background technique

The prior art mainly has CDC air spring variable-damp vibration damper assembly and MRC magnetorheological damping air spring to subtract Shake device assembly.Two kinds of vibration damper assemblies at work, need to consume a large amount of electric energy, and required electric energy can only be from outside It obtains, it is not only inconvenient but also a large amount of energy can be consumed;Vibration damper assembly internal structure is complicated simultaneously, leads to using and tieing up for later period It is all sufficiently expensive to accomplish this.

Summary of the invention

Object of the present invention is to: a kind of pneumatic spring variable-damp vibration damper assembly that can be generated electricity is provided, it can be specified It self is produced electricl energy under control environment, and structure is simple, it is easy to repair, using low with maintenance cost.

The technical scheme is that a kind of pneumatic spring variable-damp vibration damper assembly that can be generated electricity, by installing spiral shell Bolt and vibration damper assembly connector are mounted on vehicle body, are used for vehicle damping, including vibration damper assembly upper cover, air bag, can send out Damping changing impact damper ontology, the vibration damper assembly of electricity are trapped, and the air bag is pressed respectively by pressing ring on air bag and air bag lower clamping ring It is connected to cover under upper and vibration damper assembly on vibration damper assembly and put on, installation is used to be air bag charge and discharge on lid on the vibration damper assembly The stomata of gas, the air bag bottom are connect with the damping changing impact damper ontology that can be generated electricity, the damping changing impact damper to generate electricity Ontology includes shock absorber cylinder, the shock absorber piston in shock absorber cylinder body and the absorber rod being connected with shock absorber piston, The shock absorber piston is a kind of rotation piston comprising piston and brushless motor and star-like tooth in piston Take turns deceleration mechanism, the piston include piston upper cover for fixing brushless motor and with brushless motor outer wall by bearing The outer wall of the piston rotation set of rotation connection, the piston rotation set is equipped with screw thread, and the inner wall of shock absorber cylinder is equipped with therewith The guide thread that is slidably matched slot, and piston rotation set inner wall forms ring gear, the output shaft of the brushless motor and star-like tooth The centre pinion for taking turns deceleration mechanism is connected, and the peripheral planetary gear of star gear train deceleration mechanism is engaged with the ring gear, nothing The lead-out wire of brush motor is connected with vehicle control device.

It further, further include the protective device being set on the outside of the air bag, the protective device upper end subtracts with described The connection of device assembly upper cover is shaken, the protective device lower end is connect with the shock absorber cylinder.

Further, the protective device includes protective air-bag, airbag restraint cover and compressible shield, the protection Air bag is crimped onto the upper end of the vibration damper assembly upper cover and the airbag restraint cover, the gas by upper and lower two pressing rings respectively The lower end of capsule shield is crimped with the compressible shield, and the compressible shield lower end is crimped on described by pressing ring On shock absorber cylinder.

Further, the inside air bag is set at the top of the shock absorber cylinder, the air bag, extension are stretched out in bottom It point is expressed in vibration damper assembly traps by sealing ring.

Further, shock absorber cylinder bottom is fixed with damper lower cover, is fixed with lower anticollision on lid under the damper Cushion is fixed with anticollision cushion on lid on the damper.

Further, the installation bolt is set on the vibration damper assembly on lid, the vibration damper assembly connector It is set under the damper on lid.

Further, the piston further includes the piston lower cover fixed with piston rotation set bottom.

Further, it is fixed with damper upper cover at the top of the shock absorber cylinder, is provided on lid for subtracting on the damper The aperture that shake device bar passes through, aperture is interior to be equipped with sealing ring, and the absorber rod extension passes through hold-doun nut and the damper Assembly upper cover is fixed.

Further, the buffering gum cover for air bag when ineffective is provided on the vibration damper assembly on lid.

Further, the absorber rod is hollow member, and the lead-out wire of the brushless motor is out of described absorber rod It draws and is connect with the vehicle control device in portion.

The present invention adjusts bodywork height by air bag, specifically: when needing vehicle body to increase, through stomata into air bag Squeeze into gas, air bag not reflation after expansion to a certain extent then starts to stretch in the vertical direction, in folding into originally The air bag in face, which telescopes out, increases entire vibration damper assembly length;When needing vehicle body to reduce, deflated by stomata, deflation Principle is the same with raised principle, and process is opposite.

Working principle of the present invention is as follows: when absorber rod by external force downwards or while moving upwards just will drive rotation Piston moves together, just will drive internal planetary gear movement when rotating piston rotation, and then by the drive of these gears Heart tooth shaft rotation, to make brushless motor get into smooth, and due to using star gear train deceleration mechanism, piston rotation set movement is micro- Small distance can be all amplified, so that brushless motor gets up to generate electricity with higher rotational speed.

Here there are two types of working conditions for brushless motor:

Rotation: brushless motor is able to drive rotation piston and rotates together when being driven by electricity lower rotation.Therefore, work as needs When absorber rod moves up and down, it is only necessary to which the positive and negative rotation for adjusting brushless motor can be achieved with the up and down motion of absorber rod.And subtract The speed for shaking device bar up and down motion speed can be realized by raising or lowering for control brushless motor speed.

Power generation: brushless motor can produce electric energy, and revolving speed when rotating under external force (vehicle body shakes with operation) acts on Faster, the electric energy of generation is more.Therefore, it when rotating piston during exercise, will produce electricl energy, the electric energy of generation and entire damping The time for the external force that device is subject to and distance dependent;The electric energy of generation can store by control circuit or supply on vehicle Electrical equipment.

The implementation method of variable damping, according to the design, variable damping is to require in the case where a certain external force, by damping The speed of device bar up and down motion speed come determine damping size.In the identical situation of external force, absorber rod upwards or to The speed of lower movement is fast, is that damped coefficient is small;The speed that absorber rod upwardly or downwardly moves is slow, is damped coefficient Greatly.Therefore it may only be necessary to the size of the i.e. changeable damper damping of the revolving speed for changing brushless motor.Understand principles above, so that it may To know that the design can there are two types of the methods of variable damping.

One is brushless motors under as power generator, by change load (such as the electric energy of generation is used to charge, Only need to adjust the size of charging current, charging current increases, and load becomes larger, and damping becomes larger, and charging current reduces, and load subtracts Small, deattenuation) size, thus it is possible to vary damping;Another method is brushless motor in the case where being driven control, Change damping (size and force direction) by changing the speed of the brushless motor direction of motion or revolving speed.

The invention has the advantages that

1. this vibration damper assembly provided by the invention can provide good damping effect and not need to hinder greatly Buddhist nun work in the case where can produce electricl energy, by circuit control can by power storage or supply vehicle on electrical equipment, The energy is saved for user.

This vibration damper assembly provided by the invention further will can also be used to detect the Distance-sensing of bodywork height Device has been integrated in inside vibration damper assembly, can save space, improves the compatibility of product.

Detailed description of the invention

The invention will be further described with reference to the accompanying drawings and embodiments:

Fig. 1 is the structural diagram of the present invention;

Fig. 2 is the structural main section view for the damping changing impact damper ontology that can be generated electricity in the present invention;

Fig. 3 is the structural main section view of shock absorber piston;

Fig. 4 is the A-A sectional view of Fig. 3;

Wherein: 1 vibration damper assembly upper cover;101 installation bolts;102 stomatas;103 hold-doun nuts;104 buffering gum covers;2 subtract Shake device assembly is trapped;201 sealing ring A;3 air bags;Pressing ring on 301 air bags;302 air bag lower clamping rings;303 gas chambers;4 shock absorber cylinders Body;401 guide thread slots;5 absorber rods;6 lead-out wires;7 shock absorber pistons;701 screw threads;702 ring gears;8 brushless motors; 801 output shafts;9 piston upper covers;10 bearings;11 piston rotation sets;1101 screw threads;1102 ring gears;12 centre pinions;13 planets Gear;14 damper lower covers;15 piston lower covers;16 vibration damper assembly connectors;17 lower anticollision cushions;18 damper upper covers; 19 sealing ring B;Anticollision cushion on 20;21 protective air-bags;Pressing ring on 2101 protective air-bags;2102 protective air-bag lower clamping rings;22 Airbag restraint cover;23 compressible shields;Pressing ring on 2301 compressible shields;2302 compressible shield lower clamping rings.

Specific embodiment

Embodiment: total to the pneumatic spring variable-damp vibration damper provided by the invention to generate electricity in conjunction with shown in attached drawing 1-4 As follows at explaining: the pneumatic spring variable-damp vibration damper assembly that one kind can generate electricity passes through installation bolt 101 and damping Device assembly connector 16 is mounted on vehicle body, vehicle damping is used for, including vibration damper assembly upper cover 1, air bag 3, the change that can be generated electricity Damping shock absorber ontology, vibration damper assembly trap 2.

In the present embodiment, the air bag 3 possesses gas chamber 303, and air bag 3 passes through pressing ring 301 and air bag lower clamping ring on air bag 302 are crimped onto vibration damper assembly upper cover 1 and vibration damper assembly is trapped on 2 respectively, are equipped in the vibration damper assembly upper cover 1 The installation bolt 101 for the pneumatic spring variable-damp vibration damper assembly that can be generated electricity for fixation and for for 3 inflation/deflation of air bag Stomata 102.

In the present embodiment, 3 bottom of air bag is connect with the damping changing impact damper ontology to generate electricity, described to send out The damping changing impact damper ontology of electricity includes shock absorber cylinder 1, the shock absorber piston 7 in shock absorber cylinder body and lives with damper The connected absorber rod 5 of plug, the shock absorber piston 7 is a kind of rotation piston comprising piston and is set to piston Interior brushless motor 8 and star gear train deceleration mechanism, the piston include the piston upper cover 9 for fixing brushless motor 8 With the piston rotation set 11 being rotatablely connected with 4 outer wall of brushless motor by bearing 10, the outer wall of the piston rotation set 11 is equipped with Screw thread 1101, and the inner wall of shock absorber cylinder 1 is equipped with the guide thread slot 401 that is slidably matched therewith, and piston rotation covers 11 inner walls Ring gear 1102 is formed, the output shaft 801 of the brushless motor 8 is connected with the centre pinion 12 of star gear train deceleration mechanism, And the peripheral planetary gear 13 of star gear train deceleration mechanism engages 1102 with the ring gear, the lead-out wire 6 and vehicle of brushless motor 8 Controller is connected.

It in the present embodiment, further include the protective device for being set to 3 outside of air bag, the protective device includes protection Air bag 21, airbag restraint cover 22 and compressible shield 23, wherein the protective air-bag 21 includes pressing ring on protective air-bag 2101 and protective air-bag lower clamping ring 2102, protective air-bag 21 is crimped on vibration damper assembly by pressing ring 2101 on protective air-bag On lid 1, protective air-bag 21 is crimped onto the upper end of airbag restraint cover 22 by protective air-bag lower clamping ring 702, it is described compressible anti- Shield 23 includes pressing ring 2301 and compressible shield lower clamping ring 2302 on compressible shield, by pressing on compressible shield Compressible shield 23 is crimped onto the lower end of airbag restraint cover 22 by circle 2301, can by compressible shield lower clamping ring 2302 Compression shield 23 crimps on the shock absorber cylinder 4.

In the present embodiment, it is set to inside the air bag 3 at the top of the shock absorber cylinder 4, the air bag is stretched out in bottom 3, extension is expressed to vibration damper assembly by sealing ring A201 and traps in 2.

In the present embodiment, 4 bottom of shock absorber cylinder is fixed with damper lower cover 14, fixes on the damper lower cover 14 There is lower anticollision cushion 17.

In the present embodiment, the installation bolt 101 is set in the vibration damper assembly upper cover 1, and the damper is total It is set on the damper lower cover 14 at connector 16.

In the present embodiment, the piston further includes that the fixed piston lower cover 15 in 11 bottoms is covered with piston rotation.

In the present embodiment, damper upper cover 18 is fixed at the top of the shock absorber cylinder 4, in the damper upper cover 18 It is provided with the aperture passed through for absorber rod 5, is equipped with sealing ring B19 in aperture.

In the present embodiment, the absorber rod 5 is fixed in the vibration damper assembly upper cover 1 by hold-doun nut 103.

In the present embodiment, anticollision cushion 20 is fixed in the damper upper cover 18.

In the present embodiment, the buffering gum cover for air bag 3 when ineffective is provided in the vibration damper assembly upper cover 1 104。

In the present embodiment, the absorber rod 5 is hollow member, and the lead-out wire 6 of the brushless motor 4 is from the damping It draws and is connect with the vehicle control device inside device bar 5.

The present invention adjusts bodywork height by air bag, specifically: when needing vehicle body to increase, through stomata into air bag Squeeze into gas, air bag not reflation after expansion to a certain extent then starts to stretch in the vertical direction, in folding into originally The air bag in face, which telescopes out, increases entire vibration damper assembly length;When needing vehicle body to reduce, deflated by stomata, deflation Principle is the same with raised principle, and process is opposite.

Working principle of the present invention is as follows: when absorber rod by external force downwards or while moving upwards just will drive rotation Piston moves together, just will drive internal planetary gear movement when rotating piston rotation, and then by the drive of these gears Heart tooth shaft rotation, to make brushless motor get into smooth, and due to using star gear train deceleration mechanism, piston rotation set movement is micro- Small distance can be all amplified, so that brushless motor gets up to generate electricity with higher rotational speed.

Here there are two types of working conditions for brushless motor:

Rotation: brushless motor is able to drive rotation piston and rotates together when being driven by electricity lower rotation.Therefore, work as needs When absorber rod moves up and down, it is only necessary to which the positive and negative rotation for adjusting brushless motor can be achieved with the up and down motion of absorber rod.And subtract The speed for shaking device bar up and down motion speed can be realized by raising or lowering for control brushless motor speed.

Power generation: brushless motor can produce electric energy, and revolving speed when rotating under external force (vehicle body shakes with operation) acts on Faster, the electric energy of generation is more.Therefore, it when rotating piston during exercise, will produce electricl energy, the electric energy of generation and entire damping The time for the external force that device is subject to and distance dependent;The electric energy of generation can store by control circuit or supply on vehicle Electrical equipment.

The implementation method of variable damping, according to the design, variable damping is to require in the case where a certain external force, by damping The speed of device bar up and down motion speed come determine damping size.In the identical situation of external force, absorber rod upwards or to The speed of lower movement is fast, is that damped coefficient is small;The speed that absorber rod upwardly or downwardly moves is slow, is damped coefficient Greatly.Therefore it may only be necessary to the size of the i.e. changeable damper damping of the revolving speed for changing brushless motor.Understand principles above, so that it may To know that the design can there are two types of the methods of variable damping.

One is brushless motors under as power generator, by change load (such as the electric energy of generation is used to charge, Only need to adjust the size of charging current, charging current increases, and load becomes larger, and damping becomes larger, and charging current reduces, and load subtracts Small, deattenuation) size, thus it is possible to vary damping;Another method is brushless motor in the case where being driven control, Change damping (size and force direction) by changing the speed of the brushless motor direction of motion or revolving speed.

Certainly the above embodiments merely illustrate the technical concept and features of the present invention, and its object is to allow be familiar with technique People can understand the content of the present invention and implement it accordingly, it is not intended to limit the scope of the present invention.It is all according to this hair The modification that the Spirit Essence of bright main technical schemes is done, should be covered by the protection scope of the present invention.

Claims (9)

1. the pneumatic spring variable-damp vibration damper assembly that one kind can generate electricity passes through installation bolt and vibration damper assembly connector It is mounted on vehicle body, is used for vehicle damping, it is characterised in that: subtract including vibration damper assembly upper cover, air bag, the variable damping that can be generated electricity Shake device ontology, vibration damper assembly are trapped, and it is total that the air bag by pressing ring on air bag and air bag lower clamping ring is crimped onto damper respectively At putting on upper lid and under vibration damper assembly, on the vibration damper assembly on lid installation for the stomata for air bag inflation/deflation, institute It states air bag bottom to connect with the damping changing impact damper ontology that can be generated electricity, the damping changing impact damper ontology to generate electricity includes damping Device cylinder, the shock absorber piston in shock absorber cylinder body and the absorber rod being connected with shock absorber piston, the damper are living Plug is a kind of rotation piston comprising piston and brushless motor and star gear train deceleration mechanism in piston, The piston includes piston upper cover for fixing brushless motor and is rotatablely connected with brushless motor outer wall by bearing The outer wall of piston rotation set, the piston rotation set is equipped with screw thread, and the inner wall of shock absorber cylinder is equipped with to be slidably matched therewith and lead To thread groove, and piston rotation set inner wall forms ring gear, the output shaft and star gear train deceleration mechanism of the brushless motor Centre pinion be connected, and the peripheral planetary gear of star gear train deceleration mechanism is engaged with the ring gear, and brushless motor draws Outlet is connected with vehicle control device.
2. the pneumatic spring variable-damp vibration damper assembly that one kind according to claim 1 can generate electricity, it is characterised in that: also Including the protective device being set on the outside of the air bag, the protective device upper end is connect with the vibration damper assembly upper cover, institute Protective device lower end is stated to connect with the shock absorber cylinder.
3. the pneumatic spring variable-damp vibration damper assembly that one kind according to claim 2 can generate electricity, it is characterised in that: institute Stating protective device includes protective air-bag, airbag restraint cover and compressible shield, and the protective air-bag passes through upper and lower two pressures Circle is crimped onto the upper end of the vibration damper assembly upper cover and the airbag restraint cover, the lower end crimping of the airbag restraint cover respectively There is the compressible shield, the compressible shield lower end is crimped on the shock absorber cylinder by pressing ring.
4. the pneumatic spring variable-damp vibration damper assembly that one kind according to claim 1 can generate electricity, it is characterised in that: institute It states and is set to the inside air bag at the top of shock absorber cylinder, the air bag is stretched out in bottom, and extension is expressed to by sealing ring In vibration damper assembly is trapped.
5. the pneumatic spring variable-damp vibration damper assembly that one kind according to claim 1 can generate electricity, it is characterised in that: institute It states and is fixed with damper upper cover at the top of shock absorber cylinder, be provided with the aperture passed through for absorber rod on lid on the damper, open Sealing ring is equipped in hole, the part that absorber rod stretches out aperture is fixed by hold-doun nut and the vibration damper assembly upper cover, and Shock absorber cylinder bottom is fixed with damper lower cover, is fixed with lower anticollision cushion, the damper on lid under the damper Anticollision cushion is fixed on upper lid.
6. the pneumatic spring variable-damp vibration damper assembly that one kind according to claim 5 can generate electricity, it is characterised in that: institute It states installation bolt to be set on the vibration damper assembly on lid, the vibration damper assembly connector is set to the damper lower cover On.
7. the pneumatic spring variable-damp vibration damper assembly that one kind according to claim 1 can generate electricity, it is characterised in that: institute Stating piston further includes the piston lower cover fixed with piston rotation set bottom.
8. the pneumatic spring variable-damp vibration damper assembly that one kind according to claim 1 can generate electricity, it is characterised in that: institute State the buffering gum cover being provided on lid on vibration damper assembly for air bag when ineffective.
9. the pneumatic spring variable-damp vibration damper assembly that one kind according to claim 1 can generate electricity, it is characterised in that: institute Stating absorber rod is hollow member, the lead-out wire of the brushless motor drawn inside the absorber rod and with the vehicle control Device connection processed.
CN201611137021.3A 2016-12-12 2016-12-12 A kind of pneumatic spring variable-damp vibration damper assembly to generate electricity CN106763455B (en)

Priority Applications (1)

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CN201611137021.3A CN106763455B (en) 2016-12-12 2016-12-12 A kind of pneumatic spring variable-damp vibration damper assembly to generate electricity

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201611137021.3A CN106763455B (en) 2016-12-12 2016-12-12 A kind of pneumatic spring variable-damp vibration damper assembly to generate electricity

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CN106763455B true CN106763455B (en) 2018-12-28

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Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8261865B2 (en) * 2008-03-11 2012-09-11 Physics Lab Of Lake Havasu, Llc Regenerative suspension with accumulator systems and methods
CN101985965B (en) * 2010-04-09 2012-01-11 浙江吉利汽车研究院有限公司 Automobile energy renewable vibration absorber
CN102673336B (en) * 2012-05-16 2014-07-02 刘向明 Generating device for recycling energy of suspended vibration absorber to charge new-energy-source automobile
CN105114503B (en) * 2015-09-06 2017-03-22 西南交通大学 Automobile energy-feedback type damper
CN105864342B (en) * 2016-04-25 2017-12-01 山东交通学院 Circulating ball type electromagnetism power feeding shock absorber
CN106090111B (en) * 2016-06-21 2018-02-27 江苏大学 A kind of adaptive damping hydraulic vibration damper used for vehicle with height adjusting system
CN206309848U (en) * 2016-12-12 2017-07-07 上乘精密科技(苏州)有限公司 A kind of pneumatic spring variable-damp vibration damper assembly for generating electricity

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