FR2593563A1 - Accumulator of pressurised fluid for systems working under high pressure in motor vehicles - Google Patents

Accumulator of pressurised fluid for systems working under high pressure in motor vehicles Download PDF

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Publication number
FR2593563A1
FR2593563A1 FR8613347A FR8613347A FR2593563A1 FR 2593563 A1 FR2593563 A1 FR 2593563A1 FR 8613347 A FR8613347 A FR 8613347A FR 8613347 A FR8613347 A FR 8613347A FR 2593563 A1 FR2593563 A1 FR 2593563A1
Authority
FR
France
Prior art keywords
accumulator
pressure
under high
high pressure
pressurised fluid
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.)
Granted
Application number
FR8613347A
Other languages
French (fr)
Other versions
FR2593563B1 (en
Inventor
Jurgen Finke
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.)
Volkswagen AG
Original Assignee
Volkswagen AG
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 Volkswagen AG filed Critical Volkswagen AG
Publication of FR2593563A1 publication Critical patent/FR2593563A1/en
Application granted granted Critical
Publication of FR2593563B1 publication Critical patent/FR2593563B1/en
Expired legal-status Critical Current

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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
    • F15B1/10—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor with flexible separating means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
    • B60R16/08—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for fluid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
    • B60T17/06—Applications or arrangements of reservoirs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
    • B60T8/44—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition co-operating with a power-assist booster means associated with a master cylinder for controlling the release and reapplication of brake pressure through an interaction with the power assist device, i.e. open systems
    • B60T8/441—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition co-operating with a power-assist booster means associated with a master cylinder for controlling the release and reapplication of brake pressure through an interaction with the power assist device, i.e. open systems using hydraulic boosters
    • 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
    • F15B2201/00—Accumulators
    • F15B2201/20—Accumulator cushioning means
    • F15B2201/205—Accumulator cushioning means using gas
    • 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
    • F15B2201/00—Accumulators
    • F15B2201/30—Accumulator separating means
    • F15B2201/315—Accumulator separating means having flexible separating means
    • F15B2201/3151—Accumulator separating means having flexible separating means the flexible separating means being diaphragms or membranes

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Transportation (AREA)
  • General Engineering & Computer Science (AREA)
  • Valves And Accessory Devices For Braking Systems (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
  • Braking Systems And Boosters (AREA)

Abstract

The subject of the invention is an accumulator of pressurised fluid intended preferably for the braking circuits of motor vehicles, provided with an anti-locking device. The accumulator comprises a storage chamber receiving the pressurised fluid as well as a chamber containing pressurised gas, which is separated from the first one and acts on the latter via a membrane. In order to prolong the life of the accumulator, a device is provided which enables the pressure to be substantially lowered whenever the device is not operating. Field of application: circuits for fluids under high pressure.

Description

L'invention a pour objet un accusulateur de fluide sous pression destiné aux systèmes travaillant sous haute pression dans des automubiles, destiné en particulier aux circuits hydrauliques de frcinage équipés d'un dispositif autiblocage, comportant une chaubre réservoir rocavant le fluide sous pression ainsi qu'une chaubre contenant du gaz sous pression, séparés de la première au moyen d'une membrane, caract6risé par un dispositif réglable permattant de dimiuver sensiblenent la pression de l'accumulateur pendant les temps de nom fonctionnement. The subject of the invention is a pressurized fluid accumulator intended for systems working under high pressure in motor vehicles, intended in particular for hydraulic frcinage circuits equipped with a self-locking device, comprising a chaubre reservoir rocavant the fluid under pressure as well as a chaubre containing gas under pressure, separated from the first by means of a membrane, characterized by an adjustable device permattant to decrease sensiblenent the pressure of the accumulator during the times of operating name.

Les accumulateurs du fluide hydraulique sous pression suat utilisés dans des cas d'application tr8s voriés, particulièrement dans les automobiles. Ils servent, entre autres, dans les circuits hydrauliques de frei- nage d'autunobiles, en particulier dans ceur pourvus d'un dispositif antiblocage. The accumulators of hydraulic fluid under pressure are used in cases of very high application, particularly in automobiles. They are used, among other things, in hydraulic braking circuits of cars, in particular in their heart provided with an anti-lock device.

Généralement. il réside une pression de l'ordre de 140 à 200 bars dans les socumulateurs mis sous pression. etant souvent placés dans la cunpartiment de moteur du vébicule, ces accunulateurs sont soumis, en règle générale, nom seulement aux pressions élevées, mois également à des teimpérstures élevées.  Usually. there is a pressure of the order of 140 to 200 bars in the pressurized documenters. As they are often placed in the engine compartment of the vehicle, these accumulators are, as a rule, subject only to high pressures, but also to high temperatures.

Il s'est avéré que la longévité de tels aocumuiatours est liaitée et qu'ils doivent être remplacés au bout d'un certain teaps de fonctionne- ment. It has been found that the longevity of such documents is linked and that they must be replaced after a certain period of operation.

Le but de l'invention est de créer des dispositifs permettant d'augienter sensibleMent la longévité de tels accuculxteursi.  The object of the invention is to create devices making it possible to significantly increase the longevity of such accumulators.

Selon l'invention, cet objectif est atteint grâce au fait qu'un dispositif réglable parmet de diminuer sessiblement la pression de l'accumulateur pendant les temps de non-fonctionnement. According to the invention, this objective is achieved thanks to the fact that an adjustable device makes it possible to appreciably reduce the pressure of the accumulator during the non-operating times.

Dee réalisations avantageuses découlent de la description. Dee advantageous embodiments follow from the description.

L'invention vise donc à créar das dispositifs permettant d'abaisser sepsiblement la pression élevée de l'accmulateur lorsque ce dernier n'est pas sollicité pendant un cartain temps, par ensmple durant le temps de stationnesent du véhicule, cette pression étant, dans des systèmes hydrauliques connus de freinage de voitures équipés d'un dispositif antiblocage, de l'ordre de 150 å 200 bars
Dans le cas le plus simple, on réduit la pression de l'occumula- teur jusqu'à la pression atmosphérique, en le reliant, par l'intermédiaire de dispositifs à valves appropriés, à un réservoir exempt de pression ou tout dispositif similaire.The invention therefore aims to create devices making it possible to lower the high pressure of the accumulator sepsibly when the latter is not stressed during a short time, for example during the parking time of the vehicle, this pressure being, in Known hydraulic systems for braking cars equipped with an anti-lock device, of the order of 150 to 200 bars
In the simplest case, the pressure of the accumulator is reduced to atmospheric pressure, by connecting it, by means of suitable valve devices, to a pressure-free reservoir or any similar device.

Une diminution de la pression jusqu'à la pression atinosphérique signifie qu'à la mise en marche du vébicule, l'accumulateur doit être mis sous pression de nouveau, au moyen de la pompe à fluide de pression disponible dans de tels systèmes, Jusqu' la pression normale de fonction nement de l'accumulateur. Par conséquent, il est avantageux d'abaisser la pression de l'accumulateur, non pas jusqu'à la pression atmosphérique, mais jusqu'à environ 2/3 de la pression de fonctionnement. A decrease in pressure to atinospheric pressure means that when the vehicle is started, the accumulator must be pressurized again, using the pressure fluid pump available in such systems, up to normal operating pressure of the accumulator. Therefore, it is advantageous to lower the pressure of the accumulator, not to atmospheric pressure, but to about 2/3 of the operating pressure.

Gracie aux mesures prévues par l'invention, l'accumulateur de fluide sous pression n'est soumis å la pression élevée de fonctionnement, en principe et contrairement aux dispositions habituelles, que pendant le temps de fonctionnement proprement dit du système hydraulique, par exemple pendant le temps de marche du véhicule. La diminution de pression ainsi prévue umène une diminution ccrrespondante de la sollicitation des Maté- riaux, en particulier une moindre sellicitation de la mabrane élastique séparant le chambre réservoir de la chambre contenant du gaz sous pression. Thanks to the measures provided for by the invention, the pressurized fluid accumulator is subjected to the high operating pressure, in principle and contrary to the usual arrangements, only during the actual operating time of the hydraulic system, for example during vehicle running time. The reduction in pressure thus provided leads to a corresponding reduction in the stress on the materials, in particular a less softening of the elastic mabrane separating the reservoir chamber from the chamber containing gas under pressure.

Un prolongement considérable de la longévité de l'accumulateur est possible, en particulier dans le cas des systèmes hydrauliques d'automobiles où l'accumulateur est exposé non seulement à la forte pression de fonctionnement, mais aussi aux températures souvent elevées.  A considerable prolongation of the longevity of the accumulator is possible, in particular in the case of automobile hydraulic systems where the accumulator is exposed not only to the high operating pressure, but also to the often elevated temperatures.

La diminution proposée de la pression de l'accumulateur ne nécessite pas, en général, un équipement important en appareils ou en noyens de régulation. Généralement, l'on pourra utiliser des valves réglables prévues, de toutes façons, dans les systèmes antiblocage, dont le dispositif électro nique de commande et de régulation peut, de surcroît, être facilenent modi- fié de telle sorte qu'il assure également la commande de ces valves parret- tant de réaliser la diminution recherchée de la pression. L'équipement né cessite un minimum de pièces supplémentaires si l'accumulateur et les valves du système antiblocage forment déjà un seul ensemble de montage.  The proposed reduction in the pressure of the accumulator does not, in general, require significant equipment with regulating apparatus or cores. Generally, it is possible to use adjustable valves provided, in any case, in anti-lock systems, the electronic control and regulation device of which can, moreover, be easily modified so that it also ensures the control of these leaving valves to achieve the desired reduction in pressure. The equipment requires a minimum of additional parts if the accumulator and the anti-lock system valves already form a single assembly.

Claims (3)

1. Accumulateur de fluide sous pression destiné aux systèmes tra 1. Pressurized fluid accumulator intended for tra systems vaillant sous haute pression dans des automnbdles, destiné en particulier aux circuits hydrauliques de freinage équipés d'un dispositif antiblocage, comportant une chambre réservoir recevant le fluide sous pression ainsi qu'une chambre contenant du gaz sous pression1 séparée de la première au moyen d'une membrane, caractérisé par un dispositif réglable permettant de diminuer sensiblement la pression de l'accumulateur pendant les temps de non-fonctionnement. working under high pressure in automnbdles, intended in particular for hydraulic braking circuits fitted with an anti-lock device, comprising a reservoir chamber receiving the pressurized fluid as well as a chamber containing pressurized gas1 separated from the former by means of a membrane, characterized by an adjustable device allowing the pressure of the accumulator to be reduced significantly during non-operating times. 2. Accumulateur selon la revendication 1, caractérisé par le fait que la pression de l'accumulateur peut etre réduite jusqu'à la pression at mosphérique.  2. Accumulator according to claim 1, characterized in that the pressure of the accumulator can be reduced up to atmospheric pressure. 3. Accumulateur selon la revendication 1, caractérisé par le fait que la pression de l'accumulateur peut etre réduite jusqu' environ @/@ de la pression de fonctionnement de l'accumulateur.  3. Accumulator according to claim 1, characterized in that the pressure of the accumulator can be reduced up to approximately @ / @ of the operating pressure of the accumulator.
FR868613347A 1985-09-25 1986-09-24 PRESSURE FLUID ACCUMULATOR FOR HIGH PRESSURE WORKING SYSTEMS IN AUTOMOBILES Expired FR2593563B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE3534087 1985-09-25

Publications (2)

Publication Number Publication Date
FR2593563A1 true FR2593563A1 (en) 1987-07-31
FR2593563B1 FR2593563B1 (en) 1989-12-08

Family

ID=6281835

Family Applications (1)

Application Number Title Priority Date Filing Date
FR868613347A Expired FR2593563B1 (en) 1985-09-25 1986-09-24 PRESSURE FLUID ACCUMULATOR FOR HIGH PRESSURE WORKING SYSTEMS IN AUTOMOBILES

Country Status (3)

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DE (1) DE3631609C2 (en)
FR (1) FR2593563B1 (en)
IT (1) IT1197231B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2630788A2 (en) * 1988-02-05 1989-11-03 Bendix France LEAK DEVICE FOR DRAINING A MEMBRANE BATTERY
FR2626941A1 (en) * 1988-02-05 1989-08-11 Bendix France Method for draining an accumulator with a membrane and leakage device for implementing this method

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3247473A1 (en) * 1982-12-22 1984-06-28 Volkswagenwerk Ag, 3180 Wolfsburg Hydraulic system for a motor vehicle

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
HYDRAULICS & PNEUMATICS, no. 7, juillet 1980, pages 22-23, Cleveland, Ohio, US; IDEAS AND APPLICATIONS: "Mini-contest winners: log splitter acumulator unloading" *

Also Published As

Publication number Publication date
DE3631609A1 (en) 1987-04-02
IT8621715A1 (en) 1988-03-16
DE3631609C2 (en) 1994-04-28
IT8621715A0 (en) 1986-09-16
IT1197231B (en) 1988-11-30
FR2593563B1 (en) 1989-12-08

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