WO2007054282A1 - Reservoir de fluide anticavitation - Google Patents

Reservoir de fluide anticavitation Download PDF

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Publication number
WO2007054282A1
WO2007054282A1 PCT/EP2006/010697 EP2006010697W WO2007054282A1 WO 2007054282 A1 WO2007054282 A1 WO 2007054282A1 EP 2006010697 W EP2006010697 W EP 2006010697W WO 2007054282 A1 WO2007054282 A1 WO 2007054282A1
Authority
WO
WIPO (PCT)
Prior art keywords
cavitation
fluid
fluid reservoir
shut
housing
Prior art date
Application number
PCT/EP2006/010697
Other languages
German (de)
English (en)
Inventor
Stephan Walentowski
Sandra Nitsche
Original Assignee
Trw Automotive Gmbh
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 Trw Automotive Gmbh filed Critical Trw Automotive Gmbh
Publication of WO2007054282A1 publication Critical patent/WO2007054282A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/04—Accumulators
    • F15B1/08—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor
    • F15B1/24—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor with rigid separating means, e.g. pistons

Definitions

  • the invention relates to an anti-cavitation fluid reservoir for hydraulic circuits.
  • Fluid accumulators are known from the prior art and are used in particular in hydraulic circuits for the rapid provision of missing hydraulic fluid or for rapid absorption of excess hydraulic fluid.
  • external activation of an actuator poses a risk of cavitation in a pressure chamber of the actuator.
  • External control in this context means that the actuator does not perform a movement due to an increase or decrease of hydraulic fluid (pressure control), but that hydraulic fluid must be added or removed by an imposed movement.
  • Forced movements for a hydraulic actuator arise when used in a chassis stabilization system, e.g. by road bumps such as potholes, etc., which are followed by the wheel associated with the actuator.
  • the object of the invention is to solve the Kavitationsproblem with the least possible technical effort.
  • an anti-cavitation fluid reservoir for hydraulic circuits comprising a housing which encloses a storage space and a movable shut-off element which is arranged in the storage space and fluid-tightly delimits a fluid chamber with variable volume.
  • a first side of the shut-off element is acted upon with atmospheric pressure and a second side of the shut-off element with the operating pressure of the hydraulic circuit.
  • the fluid reservoir is preferably connected near the cavitation endangered point with the hydraulic circuit. Due to the proximity to the cavitation endangered point, the influences of internal friction and mass inertia of the hydraulic fluid are low, which facilitates prevention of cavitation phenomena.
  • fluid reservoir and actuator form a preassembled unit, and there are no additional connections for separate fluid reservoir in the hydraulic circuit needed.
  • the fluid-tight chamber of the anti-cavitation fluid reservoir is preferably filled with hydraulic fluid, whereby no separate fluid circuits are necessary, but a direct connection of the fluid-tight chamber to the hydraulic circuit is easily possible.
  • the shut-off element may be within the housing adjacent to the fluid-tight
  • Chamber also define an air space that communicates with the environment and just like the fluid-tight chamber has a variable volume.
  • This air space is preferably connected to the environment via a filter.
  • a spring element extends through the fluid-tight chamber or the air space and exerts a force on a pressurized side of the shut-off element.
  • the housing has a cylinder
  • the movable shut-off element is a piston which is movable between two attachment points of the cylinder.
  • Cylinder / piston units have proven to limit fluid-tight chambers with variable volume and allow attachment points of the cylinder a simple determination of the storage space size.
  • shut-off element is an elastic
  • FIG. 1 shows a section through an anti-cavitation fluid storage according to the invention, which is connected via a likewise cut pressure port with a cylinder / piston unit shown schematically;
  • FIG. 2 shows a longitudinal section through a cylinder of an actuator with an integrated anti-cavitation fluid reservoir according to the invention.
  • FIG. 1 shows schematically a cylinder / piston unit 8 with a
  • the fluid reservoir 14 has a housing 16 which encloses a storage space.
  • the housing 16 is cylindrical in the present case and is limited in the axial direction on one side by a housing bottom and on the other side by a connecting plug 18. Between this housing bottom and the connecting plug 18, a shut-off element, e.g. a piston 20, move in the axial direction.
  • Both the connecting plug 18 and the housing bottom each have an axial bore 21, 22, so that the storage space is connected via the connecting plug 18 with the hydraulic circuit and the housing bottom with the environment.
  • the piston 20 divides the storage space into a fluid chamber 23 and an air space 24 (cf., FIG. 2), wherein the piston 20 fluid-tightly delimits the fluid chamber 23 via an annular seal 26.
  • FIG. 1 shows by way of example a cavitation-endangered cylinder / piston
  • the Antikavitations-fluid reservoir 14 is arranged so that the fluid chamber with the hydraulic circuit near the Kavitationsgefährdeten Job is connected.
  • the fluid chamber is connected directly to the hydraulic circuit and filled with hydraulic fluid.
  • the operating pressure of the hydraulic circuit is always applied to a piston surface which faces the connection plug 18.
  • atmospheric pressure is present since there is a connection to the environment via the axial bore 22 in the housing bottom.
  • the operating pressure of the hydraulic circuit is significantly higher than the atmospheric pressure, so that in Figure 1, the piston 20 is drawn in a position which it occupies normally.
  • the piston 20 is located at the attachment point in the vicinity of the housing bottom, and the fluid chamber 23 has its largest possible volume.
  • the air space 24 reaches its minimum volume, which is close to zero.
  • the operating pressure of the hydraulic circuit must drop well below the atmospheric pressure.
  • the piston 20 moves in the direction of the connecting plug 18 until it reaches the maximum stop point in the vicinity of the connecting plug 18 in the extreme case.
  • the fluid chamber 23 in this case has its minimum volume; the hydraulic fluid previously present in it was released into the hydraulic circuit for cavitation prevention.
  • the air space 24 reaches its maximum volume and absorbs ambient air. To make the start of the movement of the piston independent of the ambient pressure, the installation of a spring element 28 is possible.
  • the spring element 28 extends from the connecting plug 18 through the fluid chamber 23 to the piston 20 and exerts there a force on the acted upon by the operating pressure of the hydraulic circuit piston surface.
  • compression springs are used as spring element 28, which in the present case means that the operating pressure of the hydraulic system must fall more clearly below the atmospheric pressure than without the installation of the spring to cause movement of the piston.
  • the spring element 28 can of course also be arranged between the housing bottom and the piston 20. When using a compression spring, this would mean that the
  • Piston 20 already at a drop in operating pressure to a value above the atmospheric pressure moves.
  • the use of a tension spring as a spring element 28 is of course also conceivable.
  • FIG. 2 shows a cylinder tube 30 of a cylinder / piston unit with an integrated anti-cavitation fluid reservoir 14.
  • the piston 20 is guided in the housing 16 analogously to FIG.
  • the housing 16 is designed in Figure 2 so that it closes the cylinder tube 30 at one end face.
  • the storage space communicates via radial bores 32 in the housing 16 with the interior of the cylinder and via an axial bore 22 with the environment. More specifically, this axial bore 22 is located in a cover plate 34 of the housing 16, which otherwise closes the cylindrical interior of the housing 16.
  • a filter 36 may be included, which cleans the gas mixture from the environment, usually air, before entering the storage space. This contributes to a smooth sliding of the piston 20 on an inner side of the housing 16 and to a longer life and better sealing effect of the annular seal 26 at.
  • the shut-off element is an elastic membrane which replaces the piston 20 together with any spring element 28 that may be present.
  • the membrane is peripherally attached to the peripheral wall of the housing 16 and may otherwise move within the storage space.
  • the housing 16 prevents in this case an undesirably large spread or even bursting of the membrane.
  • the operating principle of the fluid reservoir 14 is substantially similar to that of the embodiment described above with piston and spring element.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)

Abstract

L'invention concerne un réservoir de fluide anticavitation (14) pour circuits hydrauliques, qui présente un boîtier (16) qui englobe un espace de réserve ainsi qu'un élément mobile de blocage disposé dans l'espace de réserve et qui délimite de manière étanche aux fluides une chambre (22) pour fluide de volume variable. Un premier côté de l'élément de blocage est sollicité par la pression atmosphérique et un deuxième côté de l'élément de blocage est sollicité par la pression de travail du circuit hydraulique.
PCT/EP2006/010697 2005-11-08 2006-11-08 Reservoir de fluide anticavitation WO2007054282A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200520017434 DE202005017434U1 (de) 2005-11-08 2005-11-08 Antikavitations-Fluidspeicher
DE202005017434.3 2005-11-08

Publications (1)

Publication Number Publication Date
WO2007054282A1 true WO2007054282A1 (fr) 2007-05-18

Family

ID=35613412

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2006/010697 WO2007054282A1 (fr) 2005-11-08 2006-11-08 Reservoir de fluide anticavitation

Country Status (2)

Country Link
DE (1) DE202005017434U1 (fr)
WO (1) WO2007054282A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006037819A1 (de) * 2006-08-12 2008-02-14 Bayerische Motoren Werke Ag Druckspeicher für ein Hydrauliksystem
DE102007000620A1 (de) * 2007-11-05 2009-05-07 Zf Friedrichshafen Ag Vorrichtung zum Speichern von Hydraulikfluid und Verfahren zum Betreiben einer Vorrichtung zum Speichern von Hydraulikfluid
DE202014006620U1 (de) 2014-08-19 2015-11-20 Deutsches Zentrum für Luft- und Raumfahrt e.V. Aktuatoreinheit
DE102015111428A1 (de) * 2015-07-15 2017-01-19 Robert Bosch Automotive Steering Gmbh Fluidbehälter für ein hydraulisches System, hydraulisches System und Verfahren zum Betreiben eines hydraulischen Systems
DE102018112523A1 (de) * 2018-05-24 2019-11-28 Airbus Operations Gmbh Reservoir für ein Hydrauliksystem

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2169986A (en) * 1985-01-19 1986-07-23 Boge Gmbh Hydraulically damped rubber mounting
EP0270327A1 (fr) * 1986-12-01 1988-06-08 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Stabilisateur à caractéristique de ressort variable
JPH07113467A (ja) * 1993-10-15 1995-05-02 Jatco Corp 油圧制御回路用アキュムレータ
DE19709779A1 (de) * 1997-03-10 1998-09-17 Itt Mfg Enterprises Inc Druckmittelspeicher
EP1203712A2 (fr) * 2000-11-03 2002-05-08 Kirk Hibbert Système interconnecté de suspension de véhicule

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2169986A (en) * 1985-01-19 1986-07-23 Boge Gmbh Hydraulically damped rubber mounting
EP0270327A1 (fr) * 1986-12-01 1988-06-08 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Stabilisateur à caractéristique de ressort variable
JPH07113467A (ja) * 1993-10-15 1995-05-02 Jatco Corp 油圧制御回路用アキュムレータ
DE19709779A1 (de) * 1997-03-10 1998-09-17 Itt Mfg Enterprises Inc Druckmittelspeicher
EP1203712A2 (fr) * 2000-11-03 2002-05-08 Kirk Hibbert Système interconnecté de suspension de véhicule

Also Published As

Publication number Publication date
DE202005017434U1 (de) 2006-01-05

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