WO2024020648A1 - Amortisseur hydraulique - Google Patents

Amortisseur hydraulique Download PDF

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Publication number
WO2024020648A1
WO2024020648A1 PCT/AU2023/050701 AU2023050701W WO2024020648A1 WO 2024020648 A1 WO2024020648 A1 WO 2024020648A1 AU 2023050701 W AU2023050701 W AU 2023050701W WO 2024020648 A1 WO2024020648 A1 WO 2024020648A1
Authority
WO
WIPO (PCT)
Prior art keywords
fluid
damper
fluid chamber
piston
compression
Prior art date
Application number
PCT/AU2023/050701
Other languages
English (en)
Inventor
Oscar Fiorinotto
Max O'CONNELL
Original Assignee
The Dynamic Engineering Solution Pty Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from AU2022902119A external-priority patent/AU2022902119A0/en
Application filed by The Dynamic Engineering Solution Pty Ltd filed Critical The Dynamic Engineering Solution Pty Ltd
Publication of WO2024020648A1 publication Critical patent/WO2024020648A1/fr

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Classifications

    • 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
    • F16F9/06—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using both gas and liquid
    • F16F9/061—Mono-tubular units
    • 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
    • F16F9/06—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using both gas and liquid
    • F16F9/063—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using both gas and liquid comprising a hollow piston rod
    • 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
    • F16F9/06—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using both gas and liquid
    • F16F9/062—Bi-tubular units
    • 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
    • F16F9/06—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using both gas and liquid
    • F16F9/064—Units characterised by the location or shape of the expansion chamber
    • 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
    • F16F9/06—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using both gas and liquid
    • F16F9/08—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using both gas and liquid where gas is in a chamber with a flexible wall
    • F16F9/082—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using both gas and liquid where gas is in a chamber with a flexible wall characterised by the hydropneumatic accumulator
    • 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
    • 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
    • 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
    • F16F9/3482—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 the annular discs being incorporated within 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
    • F16F9/43—Filling or drainage arrangements, e.g. for supply of gas
    • 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
    • F16F9/44—Means on or in the damper for manual or non-automatic adjustment; such means combined with temperature correction
    • 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
    • F16F9/3235—Constructional features of cylinders
    • F16F9/325—Constructional features of cylinders for attachment of valve units
    • 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

Definitions

  • the present invention relates to a hydraulic damper.
  • a hydraulic damper converts kinetic energy into heat energy using viscous friction of a non- compressible fluid (such as hydraulic oil). Typically, this is achieved by passing oil through restrictions, such as restricted apertures (also known as ports) and valve mechanisms (such as shim stacks on either side of the apertures) which generate hydraulic resistance. Damping coefficient adjustments can be made by varying the aperture size and/or varying the configuration of the valve mechanism.
  • a typical hydraulic damper comprises a damper cylinder, piston rod, hydraulic piston and gas reservoir.
  • the damper cylinder is full of hydraulic oil and sealed on both ends.
  • the hydraulic piston is attached to the piston rod, which enters the hydraulic cylinder through rod seals.
  • the hydraulic piston moves through the hydraulic oil when forces are applied to the piston rod.
  • the internal oil volume capacity is reduced, wherein this volume of oil is taken up by the gas reservoir which can take many different forms depending on the damper design, such as monotube, twin tube or remote reservoir.
  • a known issue that affects hydraulic dampers is cavitation, where numerous pockets of oil vapour are created throughout the oil when the hydraulic oil vapour pressure exceeds the local static pressure. This phenomenon typically occurs when the differential pressure across the restrictions is great enough that downstream pressure falls low enough to pull dissolved air out of the oil, creating the pockets of vapour. When cavitation occurs, a small increase in static pressure will easily turn the oil vapour back into liquid, producing vibration and noise, reducing the working efficiency and possibly damaging the internals of the damper.
  • a hydraulic damper comprising a damper cylinder having an internal volume configured to contain a fluid therein, a damper piston slidably retained within the damper cylinder and separating the internal volume of the damper cylinder into a first fluid chamber and a second fluid chamber, a piston rod for driving the damper piston within the damper cylinder in compression and extension, at least one valve arrangement configured to allow the flow of fluid between the first and second fluid chambers during compression and expansion of the hydraulic damper, and a pressure source configured to provide pressure to both the first and second fluid chambers during compression and extension of the hydraulic damper.
  • the pressure source is in the form of a hydraulic accumulator comprising a compressible gas volume.
  • the hydraulic damper further comprises a separator piston slidably retained within an internal volume of the piston rod, wherein the damper piston, piston rod and separator piston collectively define the first and second fluid chambers, as well as third and fourth fluid chambers, wherein the first fluid chamber is defined by at least an inner surface of the damper cylinder and a first surface of the damper piston, the second fluid chamber is defined by an annulus formed between at least an inner surface of the damper cylinder, an outer surface of the piston rod and a second surface of the damper piston, the third fluid chamber is defined by at least an inner surface of the piston rod, a third surface of the damper piston and a first surface of the separator piston, and the fourth fluid chamber is defined by at least the inner surface of the piston rod and a second surface of the separator piston, and wherein the first, second and third fluid chambers are configured to contain a non-compressible liquid and the fourth fluid chamber is configured to contain a compressible gas.
  • the damper piston comprises the at least one valve arrangement.
  • At least one valve arrangement comprises a compression valve arrangement for allowing the flow of fluid from the first fluid chamber to the second fluid chamber during compression of the hydraulic damper.
  • the compression valve arrangement comprises a compression flow control element, configured to provide a compression damping force as fluid flows from the first fluid chamber to the second fluid chamber.
  • the at least one valve arrangement comprises an extension valve arrangement for allowing the flow of fluid from the second fluid chamber to the first fluid chamber during extension of the hydraulic damper.
  • the expansion valve arrangement comprises an expansion flow control element, configured to provide an expansion damping force as fluid flows from the second fluid chamber to the first fluid chamber.
  • the hydraulic damper further comprises at least one adjustable flow control element, configured to provide an adjustable damping force as fluid flows between the first and second fluid chambers via a bypass flow path external to the damper cylinder.
  • the at least one flow control element comprises an adjustable compression flow control element configured to provide an adjustable compression damping force as fluid flows from the first fluid chamber to the second fluid chamber via the bypass flow path.
  • the at least one flow control element comprises an adjustable expansion flow control element configured to provide an adjustable expansion damping force as fluid flows from the second fluid chamber to the first fluid chamber via the bypass flow path.
  • Figure 1 is a schematic of a hydraulic damper, according to an embodiment
  • Figure 2 is a schematic of a hydraulic damper, according to an alternate embodiment
  • Figure 3 is a perspective view of a hydraulic damper, according to an embodiment
  • Figure 4 is a sectional view of the hydraulic damper of Figure 3;
  • Figure 5 is a sectional view of the damper piston from the hydraulic damper of Figure 3, illustrating the internal features of the damper piston facilitating the flow of fluid through the piston during compression; and [0024] Figure 6 is an alternate sectional view of the damper piston from the hydraulic damper of Figure 3, illustrating the internal features of the damper piston facilitating the flow of fluid through the piston during extension.
  • the hydraulic damper 100 comprises a damper cylinder 110 having an internal volume configured to contain a fluid (such as hydraulic oil) therein.
  • the hydraulic damper 100 also comprises a piston 120 slidably retained within the damper cylinder 110 and configured to separate the internal volume of the damper cylinder into a first fluid chamber 111 and a second fluid chamber 112, as well as a piston rod 130 for driving the piston 120 within the damper cylinder 110 in compression and extension (also known as bump and rebound).
  • the hydraulic damper 100 further comprises a compression valve arrangement 140 for allowing the flow of fluid from the first fluid chamber 111 to the second fluid chamber 112 during compression of the hydraulic damper 100, and an extension valve arrangement 150 for allowing the flow of fluid from the second fluid chamber 112 to the first fluid chamber 111 during extension of the hydraulic damper 100.
  • the hydraulic damper 100 also comprises a pressure source 160 configured to provide pressure to both the first fluid chamber 111 and the second fluid chamber 112.
  • the pressure source 160 is in the form of a hydraulic accumulator 161 fluidly connected to both the first and second fluid chambers 111, 112 via first and second check valves 162, 163. It will be appreciated that pressurised fluid can only flow directly from the accumulator 161 to the first and second fluid chambers 111, 112 and not the other way around. When the damper 100 is at rest, it will be appreciated that respective pressures in the first and second fluid chambers 111, 112 will be equal to the gas pressure in the accumulator 161.
  • both the compression and expansion valve arrangements 140, 150 are represented schematically as check valves 141, 151 and damping valves 142, 152 allowing not only for the respective one way flow of fluid between the first and second fluid chambers 111, 112 to occur, but also providing means for damping the flow of fluid at different rates.
  • the damper valves 142, 152 may be configured such that damping of the fluid during extension is greater than the damping of the fluid during compression.
  • the compression and expansion valve arrangements are in the form of check valves and damping valves, it will be appreciated that this achieves a one way flow, and that alternate damping valve arrangements also providing a one way flow are also intended to fall within the scope of this disclosure.
  • the hydraulic damper 100 may also feature second compression and extension valve arrangements 170, 180, each featuring check valves 171, 181 and adjustable damping valves 172, 182, wherein the adjustable damping valves 172, 182 are each configured to be adjustable between closed and open positions respectively.
  • the accumulator 161 remains capable of providing anti-cavitating pressure to either the first or second fluid chamber as required.
  • the hydraulic damper 200 comprises a damper cylinder 210 having an internal volume configured to contain a liquid therein, the damper cylinder comprising a first end closed by an upper mount 213 and a second end closed by a seal 214.
  • the damper 200 further comprises a damper piston 220 and a piston rod 230 slidingly retained within the damper cylinder 210, and a separator piston 266 slidably retained within an internal volume of the piston rod 230.
  • the piston rod 230 comprises a first end to which the damper piston 220 is secured and a second end closed by a lower mount 231.
  • the damper piston 220, piston rod 230 and separator piston 266 collectively define first, second, third and fourth fluid chambers 211, 212, 264, 265.
  • the first fluid chamber 211 (equivalent to the first fluid chamber of Figures 1 and 2) is defined by at least an inner surface of the damper cylinder 210 and a first surface of the damper piston 220.
  • the second fluid chamber 212 (equivalent to the second fluid chamber of Figures 1 and 2) is defined by an annulus formed between at least an inner surface of the damper cylinder 210, an outer surface of the piston rod 230 and a second surface of the damper piston 220.
  • the third fluid chamber 264 is defined by at least an inner surface of the piston rod 230, a third surface of the damper piston 220 and a first surface of the separator piston 266.
  • the fourth fluid chamber 265 is defined by at least an inner surface of the piston rod 230, and a second surface of the separator piston 266.
  • the first, second and third fluid chambers 211, 212, 264 are configured to contain a non- compressible liquid such as a hydraulic oil.
  • the fourth fluid chamber 265 is configured to contain a compressible gas, such as nitrogen or air, where it will become apparent that the third and fourth fluid chambers 264, 265 separated by the separator piston 266, are equivalent to the accumulator as described in relation to Figure 1.
  • the damper piston 220 separates the first, second and third fluid chambers 211, 212, 264 and is configured to not only allow the flow of fluid between the first and second fluid chambers 211, 212 during compression and extension, but also facilitates fluid communication between the third fluid chamber 264 and the first and second fluid chambers 211, 212 as further described below.
  • the damper piston 220 is configured to allow fluid to flow from the first fluid chamber 211 to the second fluid chamber 212 via a compression valve arrangement 240.
  • the damper piston 220 is also configured to allow fluid to flow from the first fluid chamber 211 to the third fluid chamber 264, causing the gas volume in the fourth fluid chamber 265 to compress in order to accommodate fluid displaced from the damper cylinder 210 by the piston rod 230 being driven into the damper cylinder 210.
  • the damper piston 220 is also configured to allow fluid to flow from the third fluid chamber 264 to the second fluid chamber 212, where gas pressure from the fourth fluid chamber 265 acts on the separator piston 266 to maintain the same pressure in the second fluid chamber 212, reducing the likelihood of cavitation occurring in the second fluid chamber 212 during compression.
  • the damper piston 220 is configured to allow fluid to flow from the second fluid chamber 212 to the first fluid chamber 211 via an extension valve arrangement 250.
  • the damper piston 220 is also configured to allow fluid to flow from the third fluid chamber 264 to the first fluid chamber 211, causing the gas volume in the fourth fluid chamber 265 to expand in order to accommodate fluid returned to the damper cylinder 210 by the piston rod 230 being driven out of the damper cylinder 210.
  • the flow of fluid from the third fluid chamber 264 to the first fluid chamber 211 also allows for the gas pressure from the fourth fluid chamber 265 to act on the separator piston 266 to maintain the same pressure in the first fluid chamber 211, reducing the likelihood of cavitation occurring in the first fluid chamber during extension.
  • the damper piston 200 comprises a number of different fluid passages and valves as will be described in further detail below. It will of course be appreciated that the embodiment shown and described is just one version of how this can be achieved. It will however be appreciated that other variations would be expected to fall within the scope of this disclosure.
  • the damper piston 220 features a main housing 310 configured to separate the first, second and third fluid chambers 211, 212, 264.
  • the main housing 310 is configured to receive an upper body 320 and a lower body 330 spaced apart from one another and defining an inner chamber 340.
  • the upper body 320 is configured to control the flow of fluid to and from the first fluid chamber 211 and the lower body 330 is configured to control the flow of fluid to and from the second fluid chamber 212.
  • the upper body 320 comprises a plurality of compression and expansion passages 321, 322 configured to enable fluid communication between the inner chamber 340 and the first fluid chamber 211.
  • the compression passages 321 are configured to interact with a compression valve 323, such that fluid is allowed to flow from the first fluid chamber 211 to the inner chamber 340 and is damped by the compression valve 323.
  • the expansion passages 322 are configured to interact with an upper check valve 324, such that fluid is allowed to flow from the inner chamber 340 to the first fluid chamber 211 with minimal damping.
  • the compression and expansion passages 321, 322 are arranged as two concentric rings, with the outer ring comprising the compression passages 321 and the inner ring comprising the expansion passages 322.
  • the compression valve 323 is in the form of a shim stack positioned between the compression passages 321 and the inner chamber 340 on a lower surface of the upper body 320.
  • the upper check valve 324 is in the form of a shim positioned between the expansion passages 322 and the first fluid chamber 211 on an upper surface of the upper body 320.
  • the lower body 330 comprises a plurality of compression and expansion passages 331, 332 configured to enable fluid communication between the inner chamber 340 and the second fluid chamber 212.
  • the compression passages 331 are configured to interact with a lower check valve 335, such that fluid is allowed to flow from the inner chamber 340 to the second fluid chamber 212 with minimal damping.
  • the expansion passages 332 are configured to interact with an expansion valve 334, such that fluid is allowed to flow from the second fluid chamber 212 to the inner chamber 340 and is damped by the expansion valve 334.
  • the compression and expansion passages 331, 332 are arranged in two concentric rings, with the outer ring comprising the expansion passages 332 and the inner ring comprising the compression passages 331.
  • the lower check valve 335 is in the form of a shim positioned between the compression passages 331 and the second fluid chamber 212 on a lower surface of the lower body 330.
  • the expansion valve 334 is in the form of a shim stack positioned between the expansion passages 332 and the inner chamber 340 on an upper surface of the lower body 330.
  • the main housing 310 comprises a plurality of horizontal passages 312 configured to allow fluid communication between the second fluid chamber 212 and the inner chamber 340 via either of the compression and expansion passages 331, 332 of the lower body 330.
  • the main housing 310 also comprises a plurality of vertical passages 311 configured to allow fluid communication between the third fluid chamber 264 and the inner chamber 340.
  • the damper piston 220 is assembled by stacking the lower and upper bodies 320, 330 with their associated check valves 324, 335, and shim stacks 323, 334 within the main housing 310.
  • An outer surface of the upper body 320 comprises a threaded portion configured to threadingly engage with an inner threaded portion in the main housing 310, enabling the stack to be secured within the main housing 310.
  • the damper 200 also comprises an external bypass tube 350 configured to connect the first and second fluid chambers 211, 212.
  • the external bypass tube 350 is also provided with electronically adjustable compression and extension valve arrangements 270, 280, each configured to be adjustable between closed and open positions respectively.
  • fluid will either flow between the first and second fluid chambers 211, 212 through damping piston 220 or via the bypass tube 350.
  • Maximum damping will be achieved when the adjustable damping valves 270, 280 are closed and fluid flows through the damping piston 220.
  • Minimum damping will be achieved when the adjustable damping valves 270, 280 are completely opened and fluid flows through the bypass tube 350.
  • the upper and lower mounts 213, 231 comprise upper and lower eyelets via which the damper is configured to connect to the sprung and unsprung mass of a vehicle. It will however be appreciated that alternative mounting arrangements may be employed.
  • the damper is configured to provide cavitation reducing gas pressure to both the first and second fluid chambers from a single internally located pressure source.
  • the pressure source is in the form of an accumulator with a compressible gas volume, where it will be appreciated that the pressure of the gas may be varied by pre-charging the gas via a charging port (not shown).
  • the pressure of the gas may be actively controlled through connection to an additional pressure source such as a second accumulator and/or pneumatic compressor.
  • the gas volume may instead be replaced by a spring, or alternative mechanisms capable of providing a restorative force on the separator piston.
  • a single embodiment may, for succinctness and/or to assist in understanding the scope of the disclosure, combine multiple features. It is to be understood that in such a case, these multiple features may be provided separately (in separate embodiments), or in any other suitable combination. Alternatively, where separate features are described in separate embodiments, these separate features may be combined into a single embodiment unless otherwise stated or implied. This also applies to the claims which can be recombined in any combination. That is a claim may be amended to include a feature defined in any other claim. Further a phrase referring to “at least one of’ a list of items refers to any combination of those items, including single members. As an example, “at least one of: a, b, or c” is intended to cover: a, b, c, a-b, a-c, b-c, and a-b-c.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Fluid-Damping Devices (AREA)

Abstract

La présente invention concerne un amortisseur hydraulique, comprenant un cylindre d'amortisseur ayant un volume interne configuré pour contenir un fluide à l'intérieur de celui-ci, un piston d'amortisseur retenu de manière coulissante à l'intérieur du cylindre d'amortisseur et séparant le volume interne du cylindre d'amortisseur en une première chambre de fluide et en une seconde chambre de fluide, une tige de piston pour entraîner le piston d'amortisseur à l'intérieur du cylindre d'amortisseur en compression et en extension, au moins un agencement de soupape configuré pour permettre l'écoulement de fluide entre les première et seconde chambres de fluide pendant la compression et l'extension de l'amortisseur hydraulique, et une source de pression configurée pour fournir une pression à la fois à la première et à la seconde chambre de fluide pendant la compression et l'extension de l'amortisseur hydraulique.
PCT/AU2023/050701 2022-07-28 2023-07-28 Amortisseur hydraulique WO2024020648A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2022902119A AU2022902119A0 (en) 2022-07-28 Hydraulic damper
AU2022902119 2022-07-28

Publications (1)

Publication Number Publication Date
WO2024020648A1 true WO2024020648A1 (fr) 2024-02-01

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Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4899853A (en) * 1987-11-28 1990-02-13 Herman Hemscheidt Maschinenfabrik Gmbh & Co. Hydraulic shock-absorber and vibration damper with an inner tube
DE3932287A1 (de) * 1989-09-28 1991-04-11 Hemscheidt Maschf Hermann Hydropneumatische kolbenzylinderanordnung mit einem hochviskosen hydraulikmedium
US5593007A (en) * 1992-12-02 1997-01-14 Yamaha Hatsudoki Kabushiki Kaisha Shock absorber with third fluid chamber
EP1505315A2 (fr) * 2003-08-06 2005-02-09 Showa Corporation Amortisseur hydraulique
EP1531066A1 (fr) * 2003-11-11 2005-05-18 Bayerische Motoren Werke Aktiengesellschaft Amortisseur hydraulique avec un dispositif de réglage de la force d'amortissement
US20160059656A1 (en) * 2012-12-21 2016-03-03 Fludicon Gmbh Vibration Damper
US20170037923A1 (en) * 2014-04-16 2017-02-09 Alain BORDIER Hydraulic shock absorber with compression filtering
US20190136935A1 (en) * 2017-08-28 2019-05-09 Qa1 Precision Products, Inc. Shock absorber with dry valving
US20190136932A1 (en) * 2018-12-28 2019-05-09 Tenneco Automotive Operating Company Inc. Damper with control valves
US20190154100A1 (en) * 2017-01-30 2019-05-23 Fox Factory, Inc. Twin tube shock with adjustable pressure regulation
US20210239178A1 (en) * 2018-05-14 2021-08-05 öHLINS RACING AB A shock absorber and method for controlling a damping flow in a shock absorber

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4899853A (en) * 1987-11-28 1990-02-13 Herman Hemscheidt Maschinenfabrik Gmbh & Co. Hydraulic shock-absorber and vibration damper with an inner tube
DE3932287A1 (de) * 1989-09-28 1991-04-11 Hemscheidt Maschf Hermann Hydropneumatische kolbenzylinderanordnung mit einem hochviskosen hydraulikmedium
US5593007A (en) * 1992-12-02 1997-01-14 Yamaha Hatsudoki Kabushiki Kaisha Shock absorber with third fluid chamber
EP1505315A2 (fr) * 2003-08-06 2005-02-09 Showa Corporation Amortisseur hydraulique
EP1531066A1 (fr) * 2003-11-11 2005-05-18 Bayerische Motoren Werke Aktiengesellschaft Amortisseur hydraulique avec un dispositif de réglage de la force d'amortissement
US20160059656A1 (en) * 2012-12-21 2016-03-03 Fludicon Gmbh Vibration Damper
US20170037923A1 (en) * 2014-04-16 2017-02-09 Alain BORDIER Hydraulic shock absorber with compression filtering
US20190154100A1 (en) * 2017-01-30 2019-05-23 Fox Factory, Inc. Twin tube shock with adjustable pressure regulation
US20190136935A1 (en) * 2017-08-28 2019-05-09 Qa1 Precision Products, Inc. Shock absorber with dry valving
US20210239178A1 (en) * 2018-05-14 2021-08-05 öHLINS RACING AB A shock absorber and method for controlling a damping flow in a shock absorber
US20190136932A1 (en) * 2018-12-28 2019-05-09 Tenneco Automotive Operating Company Inc. Damper with control valves

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