US20190003550A1 - Improvement to frequency dependent valves - Google Patents

Improvement to frequency dependent valves Download PDF

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Publication number
US20190003550A1
US20190003550A1 US16/067,609 US201716067609A US2019003550A1 US 20190003550 A1 US20190003550 A1 US 20190003550A1 US 201716067609 A US201716067609 A US 201716067609A US 2019003550 A1 US2019003550 A1 US 2019003550A1
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Prior art keywords
pressure chamber
valve assembly
valve
spring element
volume
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
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US16/067,609
Inventor
Shi Yan
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Plush Ride GmbH
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Plush Ride GmbH
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Assigned to Plush Ride Gmbh reassignment Plush Ride Gmbh ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: YAN, SHI
Publication of US20190003550A1 publication Critical patent/US20190003550A1/en
Abandoned legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F16F9/50—Special means providing automatic damping adjustment, i.e. self-adjustment of damping by particular sliding movements of a valve element, other than flexions or displacement of valve discs; Special means providing self-adjustment of spring characteristics
    • F16F9/512—Means responsive to load action, i.e. static load on the damper or dynamic fluid pressure changes in the damper, e.g. due to changes in velocity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/10—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using liquid only; using a fluid of which the nature is immaterial
    • F16F9/14—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect
    • F16F9/16—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect involving only straight-line movement of the effective parts
    • F16F9/18—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect involving only straight-line movement of the effective parts with a closed cylinder and a piston separating two or more working spaces therein
    • F16F9/19—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect involving only straight-line movement of the effective parts with a closed cylinder and a piston separating two or more working spaces therein with a single cylinder and of single-tube type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F16F9/3207—Constructional features
    • F16F9/3214—Constructional features of pistons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F16F9/34—Special valve constructions; Shape or construction of throttling passages
    • F16F9/348—Throttling passages in the form of annular discs or other plate-like elements which may or may not have a spring action, operating in opposite directions or singly, e.g. annular discs positioned on top of the valve or piston body
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F16F9/34—Special valve constructions; Shape or construction of throttling passages
    • F16F9/348—Throttling passages in the form of annular discs or other plate-like elements which may or may not have a spring action, operating in opposite directions or singly, e.g. annular discs positioned on top of the valve or piston body
    • F16F9/3488—Throttling passages in the form of annular discs or other plate-like elements which may or may not have a spring action, operating in opposite directions or singly, e.g. annular discs positioned on top of the valve or piston body characterised by features intended to affect valve bias or pre-stress
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F16F9/50—Special means providing automatic damping adjustment, i.e. self-adjustment of damping by particular sliding movements of a valve element, other than flexions or displacement of valve discs; Special means providing self-adjustment of spring characteristics
    • F16F9/512—Means responsive to load action, i.e. static load on the damper or dynamic fluid pressure changes in the damper, e.g. due to changes in velocity
    • F16F9/5126—Piston, or piston-like valve elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F16F9/50—Special means providing automatic damping adjustment, i.e. self-adjustment of damping by particular sliding movements of a valve element, other than flexions or displacement of valve discs; Special means providing self-adjustment of spring characteristics
    • F16F9/516—Special means providing automatic damping adjustment, i.e. self-adjustment of damping by particular sliding movements of a valve element, other than flexions or displacement of valve discs; Special means providing self-adjustment of spring characteristics resulting in the damping effects during contraction being different from the damping effects during extension, i.e. responsive to the direction of movement
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F2222/00—Special physical effects, e.g. nature of damping effects
    • F16F2222/12—Fluid damping
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F2228/00—Functional characteristics, e.g. variability, frequency-dependence
    • F16F2228/04—Frequency effects
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F2228/00—Functional characteristics, e.g. variability, frequency-dependence
    • F16F2228/06—Stiffness
    • F16F2228/066—Variable stiffness

Definitions

  • the present disclosure relates to hydraulic shock absorbers and dampers which can be adapted for use in a suspension system such as the systems used for transportation vehicles. More particularly, the present disclosure relates to a frequency dependent shock absorber, to provide different damping characteristics when subjected to input of differing frequencies.
  • Frequency dependent valves such as those described in WO03040586, WO2015130544, WO2015030884, typically contain a pressure chamber, whose change in volume is related to change in preload force on a valve assembly which throttles a fluid stream.
  • movement which results in increase in preload force of the valve assembly is mostly opposed by reaction force from the valve assembly itself, but this sometimes results in sharp changes in pressure drop during a damper's stroke which is undesirable.
  • FIG. 1 shows a diagram illustrating the functioning of a valve according to the present invention.
  • FIG. 2 shows a diagram illustrating a functional alternative with respect to the one depicted in FIG. 1 , with some additional optional elements.
  • FIG. 3 shows a first embodiment of the current invention
  • FIG. 4 shows a second embodiment of the current invention
  • FIG. 5 shows a third embodiment of the current invention
  • FIG. 6 shows a fourth embodiment of the current invention
  • FIG. 1 shows a diagram illustrating the functioning of a valve according to the present invention
  • the chamber wall ( 301 ) deforms and/or moves towards the main valve assembly ( 100 ).
  • the main valve assembly ( 100 ) receives a preloading force from the pressure chamber ( 300 ), at the same time the main valve assembly ( 100 ) imparts a reaction force of the same magnitude to the pressure chamber ( 300 ), opposing its expansion.
  • a spring element ( 370 ) which can be tuned, to help return the pressure chamber ( 300 ) back to its resting volume more quickly than would be in the case without the helping element ( 370 ).
  • the helping element ( 370 ) imparts an additional force opposing the change in volume of the pressure chamber ( 300 ), which does so without adding to the preload force on the valve assembly ( 100 ).
  • FIG. 2 shows a diagram illustrating a functional alternative with respect to the one depicted in FIG. 1 , with some additional optional elements.
  • Flow restrictor ( 380 ) slows down fluid flow into the pressure chamber ( 300 ) and check valve ( 390 ) allows fast fluid exit out of the pressure chamber ( 300 ).
  • FIGS. 3-4 Structural representations of embodiments corresponding to the diagram of FIG. 2 are shown in FIGS. 3-4 :
  • FIGS. 3 and 4 Furthermore, in FIGS. 3 and 4 :
  • FIG. 3 shows an embodiment of the invention applied to a valve described in WO2015030884.
  • this valve ( 1 ) movement of chamber wall ( 301 ) towards the valve assembly ( 100 ) reduced volume of the pressure chamber ( 300 ) and preloads the valve assembly ( 100 ), so that the valve assembly throttles fluid flow ( 150 ) more.
  • the spring element ( 370 ) helps the valve assembly ( 100 ) oppose change in volume of the pressure chamber ( 300 ).
  • FIG. 4 shows an embodiment of the invention applied to a valve described in WO03040586.
  • this valve ( 1 ) movement of chamber wall ( 301 ) towards the valve assembly ( 100 ) increases volume of the pressure chamber ( 300 ) and preloads the valve assembly ( 100 ), so that the valve assembly throttles fluid flow ( 150 ) more.
  • the spring element ( 370 ) helps the valve assembly ( 100 ) oppose change in volume of the pressure chamber ( 300 ).
  • FIG. 5 shows an embodiment of the invention applied to a valve described in BE2016/0014.
  • the piston ( 10 ) is able to slide on the piston rod ( 30 ).
  • the valve assembly ( 100 ) is however fixed in its centre relative to the piston rod ( 30 ). Movement of the piston ( 10 ) relative to the piston rod ( 30 ) thus changes preload on the valve assembly ( 100 ), so that the valve assembly throttles fluid flow ( 150 ) more.
  • the movement of the piston ( 10 ) is controlled by the pressure chamber ( 300 ) so that change in volume of the pressure chamber ( 300 ) results in changed preload of the valve assembly ( 100 ).
  • the spring element ( 370 ) helps the valve assembly ( 100 ) oppose change in volume of the pressure chamber ( 300 ), and therefore movement of the piston ( 10 ).
  • FIG. 6 shows an embodiment of the invention applied to a valve described in BE2016/0013.
  • movement of chamber wall ( 301 ) towards the valve assembly ( 100 ) increases volume of the pressure chamber ( 300 ) and preloads the valve assembly ( 100 ), so that the valve assembly throttles fluid flow ( 150 ) more.
  • the spring element ( 370 ) helps the valve assembly ( 100 ) oppose change in volume of the pressure chamber ( 300 ).
  • the spring element ( 370 ) is in this case the chamber wall itself ( 301 ), configured so that for a given change in volume of the pressure chamber ( 300 ), reaction force from the spring element ( 370 ) changes faster than reaction force of the valve assembly ( 100 ).

Abstract

A valve (1) comprises: a pressure chamber (300); a valve assembly (100) controlling a passage of fluid (150), the valve assembly (100) being configured in such a way that its preload force is controlled by the pressure chamber (300); a spring element (370) that helps the valve assembly (100) oppose change in volume of the pressure chamber (300), its preload force also controlled by the pressure chamber (300); characterized in that: for a given change in volume of the pressure chamber (300), reaction force from the spring element (370) changes faster than reaction force of the valve assembly (100).

Description

    FIELD OF THE INVENTION
  • The present disclosure relates to hydraulic shock absorbers and dampers which can be adapted for use in a suspension system such as the systems used for transportation vehicles. More particularly, the present disclosure relates to a frequency dependent shock absorber, to provide different damping characteristics when subjected to input of differing frequencies.
    • BACKGROUND OF THE INVENTION AND PRIOR ART
  • Frequency dependent valves such as those described in WO03040586, WO2015130544, WO2015030884, typically contain a pressure chamber, whose change in volume is related to change in preload force on a valve assembly which throttles a fluid stream. Typically, movement which results in increase in preload force of the valve assembly is mostly opposed by reaction force from the valve assembly itself, but this sometimes results in sharp changes in pressure drop during a damper's stroke which is undesirable.
    • SUMMARY OF THE INVENTION
  • The present invention solves all the problems mentioned above as per the claims annexed to the present disclosure.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • The accompanying drawings comprise:
  • FIG. 1 shows a diagram illustrating the functioning of a valve according to the present invention.
  • FIG. 2 shows a diagram illustrating a functional alternative with respect to the one depicted in FIG. 1, with some additional optional elements.
  • FIG. 3 shows a first embodiment of the current invention
  • FIG. 4 shows a second embodiment of the current invention
  • FIG. 5 shows a third embodiment of the current invention
  • FIG. 6 shows a fourth embodiment of the current invention
    •  DESCRIPTION OF REFERENCE NUMERALS
    • 1: Frequency dependent valve
    • 10: Piston
    • 11: Flow channel
    • 30: Piston rod
    • 100: Valve assembly
    • 150: Fluid flow
    • 300: Pressure chamber
    • 301: Chamber wall
    • 370: Spring element
    • 380: Flow restrictor
    • 390: Check valve
    DETAILED DESCRIPTION OF THE DRAWINGS
  • The following description of the preferred embodiments is merely exemplary in nature and is in no way intended to limit the disclosure, its applications, or uses. Whenever the same reference number occur on different drawings, the same reference number designates similar or corresponding parts throughout the different drawings.
  • FIG. 1 shows a diagram illustrating the functioning of a valve according to the present invention:
    • A valve (1) comprising:
      • a pressure chamber (300);
      • a valve assembly (100) controlling a passage of fluid (150), the valve assembly (100) being configured in such a way that its preload force is controlled by the pressure chamber (300);
      • a spring element (370) that helps the valve assembly (100) oppose change in volume of the pressure chamber (300), its preload force also controlled by the pressure chamber (300);
    • characterized in that:
      • for a given change in volume of the pressure chamber (300), reaction force from the spring element (370) changes faster than reaction force of the valve assembly (100).
  • When the pressure chamber (300) expands, the chamber wall (301) deforms and/or moves towards the main valve assembly (100). As a result the main valve assembly (100) receives a preloading force from the pressure chamber (300), at the same time the main valve assembly (100) imparts a reaction force of the same magnitude to the pressure chamber (300), opposing its expansion.
  • It is advantageous, for an improved frequency dependency performance, to have a spring element (370), which can be tuned, to help return the pressure chamber (300) back to its resting volume more quickly than would be in the case without the helping element (370). The helping element (370) imparts an additional force opposing the change in volume of the pressure chamber (300), which does so without adding to the preload force on the valve assembly (100).
  • FIG. 2 shows a diagram illustrating a functional alternative with respect to the one depicted in FIG. 1, with some additional optional elements. Flow restrictor (380) slows down fluid flow into the pressure chamber (300) and check valve (390) allows fast fluid exit out of the pressure chamber (300).
  • Structural representations of embodiments corresponding to the diagram of FIG. 2 are shown in FIGS. 3-4:
    • A valve (1) comprising:
      • a pressure chamber (300);
      • a valve assembly (100) controlling a passage of fluid (150), the valve assembly (100) being configured in such a way that its preload force is controlled by the pressure chamber (300);
      • a spring element (370) that helps the valve assembly (100) oppose change in volume of the pressure chamber (300), its preload force also controlled by the pressure chamber (300);
    • characterized in that:
      • for a given change in volume of the pressure chamber (300), reaction force from the spring element (370) changes faster than reaction force of the valve assembly (100).
  • Furthermore, in FIGS. 3 and 4:
    • said pressure chamber (300) comprises a moveable and/or deformable chamber wall (301),
    • said spring element (370) is configured to oppose movement or deformation of said chamber wall (301) which results in increased preload of said valve assembly (100);
    • said spring element (370) is higher in stiffness than said valve assembly (100).
  • FIG. 3 shows an embodiment of the invention applied to a valve described in WO2015030884. In this valve (1), movement of chamber wall (301) towards the valve assembly (100) reduced volume of the pressure chamber (300) and preloads the valve assembly (100), so that the valve assembly throttles fluid flow (150) more. The spring element (370) helps the valve assembly (100) oppose change in volume of the pressure chamber (300).
  • FIG. 4 shows an embodiment of the invention applied to a valve described in WO03040586. In this valve (1), movement of chamber wall (301) towards the valve assembly (100) increases volume of the pressure chamber (300) and preloads the valve assembly (100), so that the valve assembly throttles fluid flow (150) more. The spring element (370) helps the valve assembly (100) oppose change in volume of the pressure chamber (300).
  • FIG. 5 shows an embodiment of the invention applied to a valve described in BE2016/0014. In this valve (1), the piston (10) is able to slide on the piston rod (30). The valve assembly (100) is however fixed in its centre relative to the piston rod (30). Movement of the piston (10) relative to the piston rod (30) thus changes preload on the valve assembly (100), so that the valve assembly throttles fluid flow (150) more. The movement of the piston (10) is controlled by the pressure chamber (300) so that change in volume of the pressure chamber (300) results in changed preload of the valve assembly (100). The spring element (370) helps the valve assembly (100) oppose change in volume of the pressure chamber (300), and therefore movement of the piston (10).
  • FIG. 6 shows an embodiment of the invention applied to a valve described in BE2016/0013. In this valve (1), movement of chamber wall (301) towards the valve assembly (100) increases volume of the pressure chamber (300) and preloads the valve assembly (100), so that the valve assembly throttles fluid flow (150) more. The spring element (370) helps the valve assembly (100) oppose change in volume of the pressure chamber (300). The spring element (370) is in this case the chamber wall itself (301), configured so that for a given change in volume of the pressure chamber (300), reaction force from the spring element (370) changes faster than reaction force of the valve assembly (100).
  • While the present invention has been described with reference to the embodiments, it will be apparent to those skilled in the art that various changes and modifications may be made as defined in the following claims.

Claims (6)

1. A valve (1) comprises:
a pressure chamber (300);
a valve assembly (100) controlling a passage of fluid (150), said valve assembly (100) being configured in such a way that its preload force is controlled by said pressure chamber (300);
a spring element (370) that helps said valve assembly (100) oppose change in volume of said pressure chamber (300), its preload force also controlled by said pressure chamber (300);
characterized in that:
for a given change in volume of said pressure chamber (300), reaction force from said spring element (370) changes faster than reaction force of said valve assembly (100);
said spring element (370) and said valve assembly (100) are configured as springs operating mechanically in parallel with respect to said pressure chamber (300).
2. A valve (1) comprises:
a pressure chamber (300);
a valve assembly (100) controlling a passage of fluid (150), said valve assembly (100) being configured in such a way that its preload force is controlled by said pressure chamber (300) by receiving a preloading force from said pressure chamber (300), and at the same time said valve assembly (100) imparts an opposing reaction force of the same magnitude to said pressure chamber (300);
characterized in that:
said valve (1) also comprises a spring element (370) that helps said valve assembly (100) oppose change in volume of said pressure chamber (300) by imparting an additional force opposing change in volume of said pressure chamber (300), which does so without adding to the preload force on said valve assembly (100), its preload force also being controlled by said pressure chamber (300);
for a given change in volume of said pressure chamber (300), reaction force from said spring element (370) changes faster than reaction force of said valve assembly (100).
3. A valve (1) according to claim 4,
characterized in that:
said pressure chamber (300) comprises a moveable and/or deformable chamber wall (301),
said spring element (370) is configured to oppose movement or deformation of said chamber wall (301) which results in increased preload of said valve assembly (100).
4. A valve (1) according to claim 5, characterized in that:
said spring element (370) is higher in stiffness than said valve assembly (100).
5. A valve (1) according to claim 1,
characterized in that:
said pressure chamber (300) comprises a moveable and/or deformable chamber wall (301),
said spring element (370) is configured to oppose movement or deformation of said chamber wall (301) which results in increased preload of said valve assembly (100).
6. A valve (1) according to claim 2,
characterized in that:
said spring element (370) is higher in stiffness than said valve assembly (100).
US16/067,609 2016-01-03 2017-01-03 Improvement to frequency dependent valves Abandoned US20190003550A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
BEBE2016/0014 2016-01-03
BE2016/0014A BE1023716B1 (en) 2016-01-03 2016-01-03 Frequency dependent shock absorber
PCT/BE2017/000005 WO2017112981A1 (en) 2016-01-03 2017-01-03 Improvement to frequency dependent valves

Publications (1)

Publication Number Publication Date
US20190003550A1 true US20190003550A1 (en) 2019-01-03

Family

ID=56800080

Family Applications (2)

Application Number Title Priority Date Filing Date
US16/473,253 Active 2037-04-25 US10907699B2 (en) 2016-01-03 2017-01-03 Sliding frequency dependent piston assembly
US16/067,609 Abandoned US20190003550A1 (en) 2016-01-03 2017-01-03 Improvement to frequency dependent valves

Family Applications Before (1)

Application Number Title Priority Date Filing Date
US16/473,253 Active 2037-04-25 US10907699B2 (en) 2016-01-03 2017-01-03 Sliding frequency dependent piston assembly

Country Status (5)

Country Link
US (2) US10907699B2 (en)
EP (1) EP3397874B1 (en)
CN (1) CN108713111A (en)
BE (2) BE1023716B1 (en)
WO (2) WO2017112980A1 (en)

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US20190017566A1 (en) * 2016-01-01 2019-01-17 Shi Yan Clamped frequency dependent piston assembly
US20190211897A1 (en) * 2016-05-23 2019-07-11 Thyssenkrupp Bilstein Gmbh Frequency-selective vibration damper for motor vehicles with a bypass control valve
US20190219127A1 (en) * 2016-05-23 2019-07-18 Thyssenkrupp Bilstein Gmbh Frequency-selective vibration damper for motor vehicles having a bypass control valve
US20200132153A1 (en) * 2017-07-07 2020-04-30 Zf Friedrichshafen Ag Damping valve for a vibration damper

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ES2772349B2 (en) * 2019-01-04 2022-03-21 Kyb Europe Gmbh Sucursal En Navarra SHOCK ABSORBER WITH HYDRAULIC LOAD REGULATION ACCORDING TO SPEED AND FREQUENCY SIMULTANEOUSLY
CN111473084B (en) * 2020-05-19 2023-06-13 黄小伟 Frequency valve

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US10907699B2 (en) 2021-02-02
US20200158204A1 (en) 2020-05-21
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CN108713111A (en) 2018-10-26
WO2017112981A1 (en) 2017-07-06

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