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WO2025203101A1 - Ensemble soupape pour amortisseur hydraulique - Google Patents

Ensemble soupape pour amortisseur hydraulique

Info

Publication number
WO2025203101A1
WO2025203101A1 PCT/IN2025/050481 IN2025050481W WO2025203101A1 WO 2025203101 A1 WO2025203101 A1 WO 2025203101A1 IN 2025050481 W IN2025050481 W IN 2025050481W WO 2025203101 A1 WO2025203101 A1 WO 2025203101A1
Authority
WO
WIPO (PCT)
Prior art keywords
disc
discs
valve assembly
valve
piston
Prior art date
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.)
Pending
Application number
PCT/IN2025/050481
Other languages
English (en)
Inventor
Koenraad Reybrouck
Muragendra Magadum
Kristoff Six
Ravi B
Swapnil Kulkarni
Pruthviraj CHAVAN
Akash DOIJODE
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GABRIEL INDIA Ltd
Original Assignee
GABRIEL INDIA 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
Application filed by GABRIEL INDIA Ltd filed Critical GABRIEL INDIA Ltd
Publication of WO2025203101A1 publication Critical patent/WO2025203101A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • F16F9/32—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
    • F16F9/3484—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 of the annular discs per se, singularly or in combination
    • 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

Definitions

  • the present disclosure relates to suspension system used for automotive vehicles and more particularly relates to a valve assembly for hydraulic shock absorbers that is applicable to mono, dual and multi tube constructions of shock absorbers to control pressure drop characteristics.
  • the damping mechanism plays a crucial role in preventing excessive bouncing or oscillations within the suspension, promoting improved vehicle stability, control, and overall comfort.
  • the hydraulic valves in the suspension comes into action, overseeing the flow of hydraulic fluid. This process transforms the kinetic energy resulting from suspension motion into heat, effectively controlling excessive motion and ultimately providing passengers with a more comfortable and stable travel experience.
  • a piston and base valve assembly plays a critical role in the functioning of suspension systems, exerting control and dampening effects on suspension movement to achieve a smoother and well-regulated ride.
  • the primary purpose is to manage and alleviate oscillations, vibrations, and disturbances caused by road imperfections like bumps or uneven terrain.
  • the main goal is to absorb or disperse the energy generated by these motions, thereby enhancing ride comfort and stability.
  • the piston is configured within the piston assembly separating the pressure tube into an upper working chamber and a lower working chamber, with the support of valve assembly and both of these chambers are filled with hydraulic fluid or oil.
  • the plurality of valves on both the rebound and compression sides regulates the movement of hydraulic fluid between these upper and lower working chambers.
  • a base valve positioned within the assembly, controls the flow of hydraulic fluid between the lower working chamber and a reserve chamber.
  • a shock absorber includes a valve disc defining two chambers, a flow passage formed in the valve disc, the flow passage allowing communication between the two chambers, a window formed in the valve disc, the window being connected to the flow passage, a valve seat formed on the valve disc, the valve seat surrounding the outer periphery of the window; and a plurality of leaf valves formed in the shape of annular plates, the plurality of leaf valves being stacked on the valve disc.
  • the first leaf valve stacked on the valve disc is provided such that an outer peripheral part is seatable on and separable from the valve seat, and includes a rib recessed on a valve disc side and projecting on an opposite valve disc side at a position facing the valve seat.
  • a damping force generation mechanism 27 includes a passage 26 for running a fluid, and the disc valve 25 opening/closing the passage 26 and composed of a plurality of stacked discs 29 and 30.
  • the disc valve 25 includes: a first disc 29 having at least one projecting part 35; a spacer 31 arranged in a position without interfering with the projecting part(s) 35 and stacked on the first disc 29; and a second disc 30 stacked on the spacer 31 and contacting the projecting part(s) 35.
  • the one another related art JP2009222124 provide a fluid pressure shock absorber for compatibly suppressing the dispersion of damping force and actualizing smooth operation of disc valves.
  • an energizing member 35 is provided whose diameter is smaller than the diameter of a valve seat 19 and which energizes the disc valves 25 in a valve opening direction until the disc valves 25 are opened.
  • the energizing member 35 energizes the disc valves 25 in the valve opening direction until they are opened.
  • JP2006183775 discloses a hydraulic shock absorber wherein a piston 5 connected to a piston rod 6 is slidably fit into a cylinder 2 sealing the oil liquid. A flow of the oil liquid caused in an extension side oil passage 11 by sliding of the piston 6 is controlled by an orifice 24 and the disc valve 21 to generate damping force.
  • Protruding parts 25 A are formed on both radial ends of a disc 25 composing the disc valve 21, discs laminated in a back face side of the protruding part 25 are warped, and a disc 24 is pressed against an outer circumference seat part 20 at a predetermined set load.
  • the one another related art JP2008281114 discloses valve structure of the shock absorber that has a valve disc 1 having ports 2a and 2b and annular valve seats la and lb arranged on the outer periphery of the ports 2a and 2b, and leaf valves 10a and 10b laminated on the valve disc 1, seated on the annular valve seats la and lb and opening-closing the ports 2a and 2b, and is characterized by fixing at least one or more of butting plates la, 11b, 11c, 13a and 13b for partially increasing deflective rigidity of the leaf valves 10a and 19b, to the back face outer periphery of the leaf valves 10a and 10b.
  • FIG. 8083039 discloses a disc valve assembly for a shock absorber opens due to axial movement of a valve disc.
  • the valve disc is biased against a valve body by a valve spring.
  • the valve spring is designed to provide a circumferentially asymmetrical load biasing the valve disc against the valve body.
  • the disc valve assembly can be used as a piston rebound valve assembly, a piston compression valve assembly, a base valve compression valve assembly or a base valve rebound valve assembly.
  • a bleed valve disc is commonly employed in both the piston and base valves.
  • the bleed opening also known as orifice, is typically situated in a straightforward manner, protruding directly outward on a circular disc.
  • This configuration is designed to manage pressure reduction effectively by utilizing a flat circular valve disc arrangement, which is pivotal for attaining the intended pressure drop characteristics.
  • preloading is achieved by providing the surface height difference in piston and base valves of the shock absorber.
  • This piston and base valves are produced through mostly by sintering process. There is limitation in tunability aspect once the piston and base valve is produced. Generally, the difference in surface height cannot be considered further as tuning parameter during the valve tuning activity, unless different versions of a piston are available.
  • An object of the present invention is to provide a better tuning range during the rebound and compression operation for a shock absorber.
  • Another object of the present invention is to provide a preloading mechanism that gives better control over the opening of valve disc.
  • Another object of the present invention is to optimize the suspension performance in a vehicle based on factors like the type of terrain, the weight of the vehicle, and the desired level of comfort.
  • the present invention relates to suspension system used for automotive vehicles and more particularly relates to a valve assembly for hydraulic shock absorbers that is applicable to mono, dual and multi tube constructions of shock absorbers to control pressure drop characteristics.
  • the second set of discs comprises at least one preload disc (22a), at least one valve disc, at least one bleed disc (22b), at least one backup preload disc and at least one backup disc.
  • the plurality of discs in the second set of discs are configured to allow a flow path for the hydraulic fluid inside the shock absorber tube from one side to another.
  • the valve assembly system for hydraulic shock absorber system is comprising of a plurality of washers each configured with an opening at the centre to receive a piston rod there through and a spacer in each set of discs separating the valve disc and the preload disc (22a).
  • the valve assembly system for hydraulic shock absorber system is comprising of a plurality of protrusions (23) on each of the preload disc (22a).
  • the protrusions (23) on each of the preload disc (22a) are positioned such that they point towards the adjacent mating disc. Together with an optional spacer disc they form a gap in between the valve discs and preload discs.
  • the preload disc (22a) includes circular or noncircular valve disc.
  • the valve assembly system for hydraulic shock absorber system is comprising of a bleed fluid passage (26) provided at each of the bleed disc (22b).
  • the bleed fluid passage (26) is configured to provide longer flow path for fluid when passing therethrough and to avoid direct hitting of the hydraulic fluid on inner tube of the shock absorber.
  • Figure 1 illustrates a pictorial representation of an unassembled valve assembly for hydraulic shock absorbers in accordance with an exemplary embodiment of the present invention
  • Figure 2 illustrates a pictorial representation of a circular preload disc in the valve assembly for hydraulic shock absorbers in accordance with an exemplary embodiment of the present invention
  • Figure 3 illustrates a pictorial representation of a clover shaped preload disc in the valve assembly for hydraulic shock absorbers in accordance with an exemplary embodiment of the present invention
  • FIG. 5 illustrates an exemplary exploded view of a valve assembly system according to one of the embodiments of the present invention.
  • the present disclosure provides a valve assembly for hydraulic shock absorbers for use in automobile suspension systems.
  • the valve assembly disclosed in accordance with the present invention is applicable to mono, dual and multi tube constructions of shock absorbers and wherein hydraulic fluid preferably oil is used as damping medium. More precisely, the disclosure relates to circular, non-circular or other shaped valve disc arrangement which provide protrusion (23)s to control pressure drop characteristics.
  • references in the present invention to “one embodiment” or “an embodiment” mean that a particular feature, structure, characteristic, or function described in connection with the embodiment is included in at least one embodiment of the invention.
  • the appearances of the phrase “in one of the exemplary embodiments” in various places in the specification are not necessarily all referring to the same embodiment.
  • valve assembly (100) a valve assembly for hydraulic shock absorber (hereinafter the valve assembly (100)’), in accordance with the present invention is shown.
  • the valve assembly (100) comprises a plurality of valve discs configured to allow a flow path for the hydraulic fluid inside the shock absorber tube from one side to another.
  • the valve assembly (100) is configured within a piston assembly, wherein the piston assembly additionally comprises of apiston (10), a sealing assembly, a bump stop, and a rod guide therein.
  • the piston (10) is designed as a cylindrical component configured with a plurality of flow passages of same dimension connecting both the sides.
  • the piston (10) is designed as cylindrical component configured with a plurality of flow passages of different dimension connecting both the sides.
  • the valve assembly comprises a first set of discs secured at the rebound side and a second set of discs at the compression side of the piston.
  • the individual discs in the first and the second set of discs in the valve assembly providing a passage for the fluid inside the shock absorber cylinder from one end of the piston to the other, specifically between the tension side and a compression side.
  • the individual elements in the first and the second set of discs are layered in various arrangements in exemplary embodiments to manage the hydraulic fluid's flow, enabling precise adjustments to the shock absorber's performance in accordance with the application.
  • the valve assembly includes a plurality of slender metal discs (22) of varying size and shape, and a plurality of washers each configured with an opening at the centre to receive a piston rod there through.
  • the plurality of discs (22) are designed to provide varying levels of resistance to the movement of the fluid flowing therethrough based on the speed and intensity of the suspension's motion.
  • the valve assembly comprises the first set of discs of varying size arranged in rebound side of the piston, similarly, the second set of discs of varying size in compression side of the piston.
  • the valve assembly comprises the first set of discs of varying size arranged in ascending order in rebound side, similarly, the second set of discs of varying size arranged in descending order in compression side.
  • the first set of discs comprises at least one preload disc (22a), at least one valve disc, at least one bleed disc (22b), at least one backup preload disc and at least one backup disc etc.
  • the second set of discs comprises at least one preload disc (22a), at least one valve disc, at least one bleed disc (22b), at least one backup preload disc and at least one backup disc etc.
  • the valve disc and the preload disc (22a) are separated by a spacer.
  • the first set of discs comprises at least one valve disc, and at least one preload disc (22a).
  • the second set of discs comprises at least one valve disc, at least one preload disc (22a).
  • At least one bleed disc (22b) is present in the first or second set of discs.
  • the valve disc and the preload disc (22a) are separated by a spacer.
  • the preload disc (22a) in the valve assembly in accordance with the present invention includes a circular or noncircular valve disc.
  • the noncircular valve disc is designed with plurality of lobes with at least one protrusion (23) that forms a gap in between the individual discs. Further, gap between the adjacent lobes in the disc is arranged to allow a flow passage for the fluid inside the shock absorber tube.
  • the valve assembly in accordance with the present invention comprises at least one preload disc (22a) provided with at least one lobe resembles a clover shaped design with a protrusion (23) near to the curved edges and a centre hole to receive a piston therethrough.
  • the valve assembly in accordance with the present invention comprises at least one preload disc (22a) provided as a circular disc with at least one protrusion (23) near to the curved edge and a centre hole to receive a piston therethrough.
  • the protrusion (23)s are provided on preload disc (22a) in such a way that it is positioned straight, pointing towards the adjacent mating disc. This controls the preloading force which is one of the controlling factors in damping force characteristics and helps in achieving the desired consistency in damping force.
  • the preloading by way of introducing protrusions (23) on at least one valve disc provides better and more fine control over the opening of the individual valve discs (22) in the valve assembly. This type of preloading arrangement provides greater tunability option than the conventional preloading arrangement provided in piston.
  • the protrusion (23)s are introduced at any location with same or different dimension on the flat surface of the valve disc of circular, non-circular or any shaped valve disc to achieve said preloading adjustments.
  • the first or second or both set of discs are arranged with at least one lobed disc with a bleed disc (22b) in symmetric and asymmetric configurations.
  • each of the bleed disc (22b) in the first and second set is designed with a plurality of lobes, and these lobes are arranged in a manner where they maintain a uniform distance from the centre of the disc, resulting in a symmetrical arrangement.
  • each of the bleed disc (22a) in the first and second set is designed with a plurality of lobes of varying size.
  • the individual valve discs (22) in the valve assembly are made in identical dimensions or in varying dimensions.
  • valve disc (22) with largest dimension in both first and second set of discs are arranged close to the piston (10) thereon.
  • the bleed disc (22a) has the largest diameter and is made in close contact with the flat surface of the piston in both tension and the compression side.
  • the valve assembly comprises a plurality of discs (22) that are arranged in series configuration with varying width and thickness combinations, which enhances tunability of the shock absorber.
  • the individual components in the piston assembly are designed in such a way that angular or tangential alignment between at least two components is made possible by the process.
  • the bleed fluid passage (26) on the bleed disc (22b) may be positioned away from the curved outer edge of each of the lobes in the bleed disc (22b), preferably towards a side of the lobe.
  • the bleed disc(22b) is comprising of the bleed fluid passage (26) in an outward direction of each lobe configured on the outside curved edge of a lobe, or on an edge on side of the of a lobe.
  • the openings in the bleed disc (22b) can be configured anywhere on the outside edge of the bleed disc (22b).
  • the at least one bleed disc (22b) is comprising of at least one bleed fluid passage (28) arranged in an inclined fashion with respect to the edge.
  • the multiple bleed disc (22b) in the valve assembly system are oriented with respect to each other so that the orifice openings overlaps, creating a larger combined orifice opening.
  • the individual valve discs (22) in the valve assembly system are made in identical dimensions or in varying dimensions.
  • the valve disc (22) with largest dimension in both first and second set of discs are arranged close to the piston (10) thereon.
  • the bleed disc (22a) in the valve assembly system has the largest diameter and is made in close contact with the flat surface of the piston in both tension and the compression side.
  • a plurality of discs (22) in the valve assembly system are arranged in series configuration with varying width and thickness combinations to enhances tunability of the shock absorber.
  • the valve assembly system is configured in apiston assembly comprising of a piston (10), a sealing assembly, a bump stop, and a rod guide.
  • the piston (10) comprises construction as a cylindrical component with two opposite sides forming a tension side and a compression side and each of the tension side and the compression side configured to receive the valve assembly that regulates the flow of hydraulic fluid as the suspension moves.
  • the plurality of ports (25) configured in the piston provide fluid flow passages defined to generate different pressure drop characteristics inside the shock absorber.
  • the raised platform (11) structured in the piston on both rebound and the compression sides is in a shape similar to the disc that is configured in a closest position.
  • valve assembly system for hydraulic shock absorber system demonstrates a plurality of advantages including but not limited to:
  • the non-circular disc arrangement in the valve assembly which has asymmetric/asymmetric features helps to control the pressure drop characteristics in shock absorbers. Furthermore, proper alignment between the valve components is essential to enhance the asymmetric characteristics within a valve stack. These features contribute to improved ride comfort and NVH (Noise, Vibration, and Harshness) control.
  • valve assembly provides better pre loading by means of external protrusion (23) mechanism and not only due to difference in surface heights of piston and base valves respectively. Differences in heights of protrusion (23)s and position of protrusion (23) on disc are considered as tuning parameters during valve tuning activity.
  • a smooth opening of the plurality of discs (22) is provided by means of non-circular shaped valve disc arrangement.
  • one, two or multiple lobes are provided to form a clover shaped disc arrangement and preloaded to avoid the leakage of oil during initial velocities of shock absorber.
  • the plurality of lobes in the bleed disc (22b) particularly the clover shape of the discs helps a smooth opening at different time intervals once the oil pressure is cracked/exceeded the preloading pressure of valve disc. This makes no possibility of generating erratic results in damping operation.
  • the position of the protrusions (23) can positively influence the opening behavior of the valve, resulting in a more controlled and / or smoother opening.
  • the inclined bleed fluid passage (28) on the side of the clovers serves the purpose of limiting direct impact of hydraulic fluid jet on the inner tube of the shock absorber, resulting in a reduction of noise caused by oil flow within the shock absorber.
  • the ports (12) configured on the piston provides a plurality of oil flow passages that are defined to generate different pressure drop characteristics. Further, the clover shaped valve disc arrangement aligns with the inflow and outflow opening in said connected piston ports.

Landscapes

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

Abstract

L'invention concerne un ensemble soupape pour amortisseurs hydrauliques destiné à être utilisé dans des systèmes de suspension d'automobile. La présente invention est applicable à des constructions monotubes, à double tube et à tubes multiples d'amortisseurs et le fluide hydraulique, de préférence de l'huile, étant utilisé comme milieu d'amortissement. Plus précisément, l'invention concerne un agencement de disque de soupape circulaire, non circulaire ou autre avec au moins un disque de soupape (22) pourvu de saillies (23) à des emplacements spécifiques pour commander des caractéristiques de chute de pression.
PCT/IN2025/050481 2024-03-28 2025-03-26 Ensemble soupape pour amortisseur hydraulique Pending WO2025203101A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN202421025180 2024-03-28
IN202421025180 2024-03-28

Publications (1)

Publication Number Publication Date
WO2025203101A1 true WO2025203101A1 (fr) 2025-10-02

Family

ID=97218271

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IN2025/050481 Pending WO2025203101A1 (fr) 2024-03-28 2025-03-26 Ensemble soupape pour amortisseur hydraulique

Country Status (1)

Country Link
WO (1) WO2025203101A1 (fr)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090057079A1 (en) * 2007-08-29 2009-03-05 Tenneco Automotive Operating Company, Inc. Disc spring intake

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090057079A1 (en) * 2007-08-29 2009-03-05 Tenneco Automotive Operating Company, Inc. Disc spring intake

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