EP1869328A1 - Pressure medium accumulator, accumulator unit comprising a plurality of pressure medium accumulators and method for manufacturing a pressure medium accumulator - Google Patents

Pressure medium accumulator, accumulator unit comprising a plurality of pressure medium accumulators and method for manufacturing a pressure medium accumulator

Info

Publication number
EP1869328A1
EP1869328A1 EP06708400A EP06708400A EP1869328A1 EP 1869328 A1 EP1869328 A1 EP 1869328A1 EP 06708400 A EP06708400 A EP 06708400A EP 06708400 A EP06708400 A EP 06708400A EP 1869328 A1 EP1869328 A1 EP 1869328A1
Authority
EP
European Patent Office
Prior art keywords
accumulator
piston
pressure medium
storage
receptacle
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.)
Withdrawn
Application number
EP06708400A
Other languages
German (de)
French (fr)
Inventor
Andreas Weh
Alexander Bareiss
Nathan Mccormick
Holger Fischer
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch 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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1869328A1 publication Critical patent/EP1869328A1/en
Withdrawn legal-status Critical Current

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
    • 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
    • B60T8/36—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 including a pilot valve responding to an electromagnetic force
    • B60T8/3615—Electromagnetic valves specially adapted for anti-lock brake and traction control systems
    • B60T8/3675—Electromagnetic valves specially adapted for anti-lock brake and traction control systems integrated in modulator units
    • B60T8/368—Electromagnetic valves specially adapted for anti-lock brake and traction control systems integrated in modulator units combined with other mechanical components, e.g. pump units, master cylinders
    • 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
    • B60T8/42—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 having expanding chambers for controlling pressure, i.e. closed systems
    • B60T8/4275—Pump-back systems
    • 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
    • F15B2201/21—Accumulator cushioning means using springs
    • 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
    • F15B2201/31—Accumulator separating means having rigid separating means, e.g. pistons
    • F15B2201/312—Sealings therefor, e.g. piston rings
    • 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
    • F15B2201/60—Assembling or methods for making accumulators
    • F15B2201/61—Assembling or methods for making separating means therefor

Definitions

  • the invention relates to a pressure fluid store according to the generic features of claim 1, a memory unit of a plurality of pressure fluid stores according to the generic features of claim 9 and a method for producing a pressure fluid store according to the generic features of claim 10.
  • Pressure fluid accumulators are used for example in hydraulic circuits slip-controlled vehicle brake systems. Their task is to absorb pressure medium from one of the wheel brakes, thereby enabling, if necessary, a rapid reduction of the brake pressure in this wheel brake.
  • the accumulator has a hydraulic connection to the suction side of an electrically driven pressure generator of the vehicle brake system. Depending on the operating state of the vehicle brake system, this pressure generator empties the pressure fluid accumulator by sucking stored pressure fluid out of the accumulator and returning it to one of the brake circuits or to a master brake cylinder.
  • Known accumulator have a storage housing and an axially slidably received therein accumulator piston.
  • the accumulator piston cooperates with a return element and has a piston seal in a peripheral receptacle. This divides the interior of the storage enclosure in two mutually sealed storage chambers. One of these storage chambers can be filled with the pressure medium of the vehicle brake system, the other storage chamber receives the return element of the accumulator piston and is usually vented.
  • Known accumulator pistons are made of plastic.
  • storage pistons made of plastic have a relatively thick minimum wall thickness. This limits the available installation space for the return element in the storage housing. Desirable, however, the largest possible installation space, because then a pressure fluid accumulator can be provided with low response pressure at the same time the highest possible restoring force by adapted dimensioning of the return element.
  • plastic accumulator pistons decrease in strength with increasing ambient temperature. This restricts the scope with regard to the design of the storage piston further.
  • special care must be taken to avoid damage or contamination by abrasion.
  • a pressure fluid store with the characterizing features of claim 1 and a memory unit with the characterizing features of claim 9 and a method for producing a pressure fluid store according to the features of claim 10 has the advantage that as a storage piston relatively thin-walled, inexpensive from a sheet material can be used by forming components that require little space and thereby have higher strength values, even at increasing ambient temperatures than known storage piston made of plastic.
  • a forming process manufacturing process allows the simple and inexpensive representation of areas of different wall thicknesses on the accumulator piston.
  • the highly loaded piston crown can thereby be made with greater wall thickness than the less loaded shaft of the accumulator piston (claim 2).
  • the receptacle for the piston seal advantageously be dimensioned such that its inner diameter simultaneously forms a radial support for the partially arranged in the interior of the accumulator piston return element.
  • Claim 10 is as a preferred manufacturing process for a storage piston produced by forming a deep-drawing process and for receiving the piston seal on the accumulator piston a rolling method and also proposes to carry out these two steps for cost reasons simultaneously in a combined operation.
  • FIG. 1 shows a memory unit - A -
  • Figure 1 shows a section of a housing 10 of a hydraulic unit of a slip-controlled vehicle brake system.
  • the housing 10 is formed by a metal block 12, on which installation spaces are provided, inter alia, for solenoid valves, pumps, a pump drive and accumulators 14.
  • the pressure fluid reservoir 14 are shown, since the other components for the understanding of the invention are irrelevant. Since vehicle brake systems are usually designed to be at least two-circuited for safety reasons, a memory unit of a total of two pressure fluid reservoirs 14 is shown in FIG. The function of the accumulator 14 within a slip-controlled vehicle brake system has already been explained above.
  • the storage housing 16 of the accumulator 14 are formed by two separate blind holes. The latter start from a common peripheral surface of the metal block 12 and have, for example, parallel longitudinal axes. The outwardly facing openings of the storage housing 16 are closed by a common cover 18. This is anchored in the embodiment by means of fastening means 20, such as screws, on the metal block 12.
  • the mounting member 20 is also used for fixing a bearing element 22 on the metal block 12.
  • the bearing element 22 is essentially made of a vibration damping elastomer and is used together with other provided on the housing 10 bearing elements 22 for vibration-decoupled storage of the hydraulic unit in the vehicle, for example in a provided holder (not shown).
  • the lid 18 would be fixed in position on its inner side by a support of restoring elements 26, to be described below, of the accumulator 14.
  • the lid 18 could be fixed without forming material, for example, by caulking the metal block 12 or by plastic deformation of the lid 18 even in a designated receptacle of the metal block 12.
  • a separate lid 18 could also be provided.
  • the metal block 12 is passed through pressure medium-carrying bores 28 which extend transversely to the longitudinal axis of the storage housing 16.
  • the holes 28 are connected via branch channels 30 with the interior of the storage housing 16 and thus ensure the pressure medium supply of the pressure fluid reservoir 14 safely.
  • branch channels 30 open into a storage housing 16 by way of example.
  • a storage piston 32 is received axially movable.
  • This accumulator piston 32 has a cup-shaped design and accordingly has a cylindrical shaft 32a and a bottom 32b closing the shaft 32a at one end.
  • the accumulator piston 32 cooperates with the return element 26 in the form of a compression spring which presses the accumulator piston 32 in the illustrated basic position. In this basic position, the accumulator piston 32 lies with its bottom 32b in block with the closed end of the accumulator housing 16.
  • the restoring element 26 is supported on the one hand on the inside of the bottom 32b of the accumulator piston 32 and on the opposite side to the cover 18 which closes the accumulator housing to the outside
  • the accumulator piston 32 has an integrally formed receptacle 32c on the circumference of its shaft.
  • a piston seal 34 is inserted, which in communication with the inner wall of the storage housing 16 and the shaft 32a of the accumulator piston 32, two storage chambers 36a, 36b against each other.
  • the first storage chamber 32a facing away from the shaft 32a of the accumulator piston 32 is, as mentioned, filled with hydraulic pressure medium via the branch channels 30, while the second accumulator chamber 36b is ventilated and receives the return element 26.
  • a piston seal 34 a conventional O-ring is used as an example.
  • Figure 2 shows the accumulator piston 32 again in detail.
  • the storage piston 32 is produced by forming, preferably in a deep-drawing process. He has a uniform in relation to its outer diameter low wall thickness and takes correspondingly little space to complete. The installation space remaining within the storage housing 16 is correspondingly large for the restoring element 26.
  • the bottom 32b of the accumulator piston 32 could also have a greater wall thickness than the shaft 32a. This is shown in FIG. 1 on the basis of the right-hand of the two accumulator pistons 32.
  • the receptacle 32c on the outer circumference of the accumulator piston 32 is erf ⁇ ndungshiel made by forming technology.
  • a roller burnishing method as it is also used for example for the representation of bulb sockets, is suitable for this purpose.
  • the production of the accumulator piston 32 and the receptacle 32c can be carried out for cost reasons in a combined operation.
  • the dimensions of the receptacle 32c, the piston seal 34 and the return element 26 are preferably coordinated such that the inner diameter Dl of the receptacle 32c is only slightly larger than the outer diameter D2 of the return element 26, whereby the receptacle 32c acts as a radial support for this return element 26 ,
  • the receptacle 32 c for the piston seal 34 is preferably arranged in the vicinity of the bottom 32 b of the accumulator piston 32.
  • the adjoining on both sides of the receptacle 32c in the axial direction sections 32d and 32e of the shaft 32a of the accumulator piston 32 preferably have the same outer diameter and form two axially spaced guides, which ensure the movement of the accumulator piston 32 in the blind hole 16 of the storage enclosure by counteract tilting or jamming of the accumulator piston 32.
  • these guide-forming sections 32d and 32e may be provided with a friction-reducing coating 33, for example a lacquer. Also attached to the guides adhesive sheets of pressure medium-resistant and friction-reducing material are conceivable for this purpose.
  • the open end of the accumulator piston 32 may have an inwardly curled portion 32f as shown in FIG. 2 to further enhance the sliding properties of the accumulator piston 32. Sharp-edged corners on the storage piston 32, which could cut into the wall of the blind hole 16 of the storage enclosure, thereby avoided.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Transportation (AREA)
  • Electromagnetism (AREA)
  • General Engineering & Computer Science (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
  • Transmission Of Braking Force In Braking Systems (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Valves And Accessory Devices For Braking Systems (AREA)

Abstract

A pressure medium accumulator (14), in particular for a slip-controlled vehicle brake system, an accumulator unit comprising a plurality of pressure medium accumulators (14) and a method for manufacturing a pressure medium accumulator (14) are proposed. The pressure medium accumulator (14) according to the invention has a larger installation space, with an unchanged overall size, for a restoring element (26) which interacts with an accumulator plunger (32), and can be manufactured inexpensively at the same time. To this end, a component which is formed without cutting from a sheet-metal material is proposed as accumulator plunger (32), a circumferential receptacle (32c) for a plunger seal (34) likewise being formed without cutting on the circumference of the said component. The accumulator plunger (32) can be manufactured by deep drawing; the receptacle (32c) for the plunger seal (34) can be manufactured by roller-burnishing. Both method steps can be carried out inexpensively in one combined operation.

Description

Druckmittelspeicher, Speichereinheit aus mehreren Druckmittelspeichern und Verfahren zur Herstellung eines DruckmittelspeichersPressure medium accumulator, storage unit of several pressure fluid accumulators and method for producing a pressure fluid accumulator
Stand der TechnikState of the art
Die Erfindung geht aus von einem Druckmittelspeicher entsprechend den gattungsbildenden Merkmalen des Anspruchs 1, einer Speichereinheit aus mehreren Druckmittelspeichern entsprechend den gattungsbildenden Merkmalen des Anspruchs 9 und einem Verfahren zur Herstellung eines Druckmittelspeichers entsprechend den gattungsbildenden Merkmalen des Anspruchs 10.The invention relates to a pressure fluid store according to the generic features of claim 1, a memory unit of a plurality of pressure fluid stores according to the generic features of claim 9 and a method for producing a pressure fluid store according to the generic features of claim 10.
Druckmittelspeicher werden beispielsweise in Hydraulikkreisen schlupfgeregelter Fahrzeugbremsanlagen eingesetzt. Ihre Aufgabe besteht darin, Druckmittel aus einer der Radbremsen aufzunehmen, um dadurch bei Bedarf einen schnellen Abbau des Bremsdrucks in dieser Radbremse zu ermöglichen. Neben einer hydraulischen Verbindung mit einer Radbremse weist der Druckmittelspeicher eine hydraulische Verbindung zur Saugseite eines elektrisch antreibbaren Druckerzeugers der Fahrzeugbremsanlage auf. Dieser Druckerzeuger entleert den Druckmittelspeicher je nach Betriebszustand der Fahrzeugbremsanlage, indem er gespeichertes Druckmittel aus dem Druckmittelspeicher absaugt und zurück in einen der Bremskreise bzw. zu einem Hauptbremszylinder fördert.Pressure fluid accumulators are used for example in hydraulic circuits slip-controlled vehicle brake systems. Their task is to absorb pressure medium from one of the wheel brakes, thereby enabling, if necessary, a rapid reduction of the brake pressure in this wheel brake. In addition to a hydraulic connection with a wheel brake, the accumulator has a hydraulic connection to the suction side of an electrically driven pressure generator of the vehicle brake system. Depending on the operating state of the vehicle brake system, this pressure generator empties the pressure fluid accumulator by sucking stored pressure fluid out of the accumulator and returning it to one of the brake circuits or to a master brake cylinder.
Bekannte Druckmittelspeicher haben ein Speichergehäuse und einen darin axial verschiebbar aufgenommenen Speicherkolben. Der Speicherkolben wirkt mit einem Rückstellelement zusammen und weist in einer umfangsseitigen Aufnahme eine Kolbendichtung auf. Diese teilt den Innenraum des Speichergehäuses in zwei gegeneinander abgedichtete Speicherkammern. Eine dieser Speicherkammern ist mit dem Druckmittel der Fahrzeugbremsanlage befüllbar, die andere Speicherkammer nimmt das Rückstellelement des Speicherkolbens auf und ist üblicherweise belüftet. Bekannte Speicherkolben sind aus Kunststoff hergestellt.Known accumulator have a storage housing and an axially slidably received therein accumulator piston. The accumulator piston cooperates with a return element and has a piston seal in a peripheral receptacle. This divides the interior of the storage enclosure in two mutually sealed storage chambers. One of these storage chambers can be filled with the pressure medium of the vehicle brake system, the other storage chamber receives the return element of the accumulator piston and is usually vented. Known accumulator pistons are made of plastic.
Unter anderem aus Festigkeitsgründen weisen Speicherkolben aus Kunststoff eine verhältnismäßig dicke Mindestwandstärke auf. Dies beschränkt den zur Verfügung stehenden Einbauraum für das Rückstellelement im Speichergehäuse. Erstrebenswert ist jedoch ein möglichst großer Einbauraum, weil dann durch angepasste Dimensionierung des Rückstellelements ein Druckmittelspeicher mit niedrigem Ansprechdruck bei gleichzeitig möglichst hoher Rückstellkraft bereitgestellt werden kann.Among other things, for reasons of strength, storage pistons made of plastic have a relatively thick minimum wall thickness. This limits the available installation space for the return element in the storage housing. Desirable, however, the largest possible installation space, because then a pressure fluid accumulator can be provided with low response pressure at the same time the highest possible restoring force by adapted dimensioning of the return element.
Daneben weisen Speicherkolben aus Kunststoff mit steigender Umgebungstemperatur sinkende Festigkeitswerte auf. Dies schränkt den Spielraum hinsichtlich der konstruktiven Gestaltung des Speicherkolbens weiter ein. Bei der Montage eines Kunststoffspeicherkolbens in ein Speichergehäuse muss zudem besondere Sorgfalt aufgewendet werden, um Beschädigungen oder Verschmutzungen durch Abrieb zu vermeiden.In addition, plastic accumulator pistons decrease in strength with increasing ambient temperature. This restricts the scope with regard to the design of the storage piston further. When mounting a plastic storage piston in a storage housing special care must be taken to avoid damage or contamination by abrasion.
Vorteile der ErfindungAdvantages of the invention
Demgegenüber weist ein Druckmittelspeicher mit den kennzeichnenden Merkmalen des Anspruchs 1 bzw. eine Speichereinheit mit den kennzeichnenden Merkmalen des Anspruchs 9 bzw. ein Verfahren zur Herstellung eines Druckmittelspeichers entsprechend den Merkmalen des Anspruchs 10 den Vorteil auf, dass als Speicherkolben relativ dünnwandige, kostengünstig aus einem Blechmaterial durch Umformen hergestellte Bauteile verwendet werden können, die wenig Bauraum beanspruchen und dabei höhere Festigkeitswerte, selbst bei steigenden Umgebungstemperaturen aufweisen als bekannte Speicherkolben aus Kunststoff.In contrast, a pressure fluid store with the characterizing features of claim 1 and a memory unit with the characterizing features of claim 9 and a method for producing a pressure fluid store according to the features of claim 10 has the advantage that as a storage piston relatively thin-walled, inexpensive from a sheet material can be used by forming components that require little space and thereby have higher strength values, even at increasing ambient temperatures than known storage piston made of plastic.
Aufgrund des geringen Bauraumbedarfs eines Speicherkolbens entsprechend der Erfindung steht ein größerer Einbauraum für das Rückstellelement zur Verfügung. Dies erlaubt größere Freiheiten bei der konstruktiven Umsetzung der Funktionsanforderungen an das Rückstellelement. Ein erfϊndungsgemäßer Speicherkolben ist in der erforderlichen Qualität hinsichtlich Durchmesser und Rundheit ohne Nachbearbeitung herstellbar. Gleichzeitig mit der vorgeschlagenen Herstellungsweise des Speicherkolbens kann die Aufnahme für die Kolbendichtung realisiert werden.Due to the small space requirement of a storage piston according to the invention, a larger installation space for the return element is available. This allows greater freedom in the design implementation of the functional requirements of the return element. An erfϊndungsgemäßer accumulator piston is produced in the required quality in terms of diameter and roundness without post processing. Simultaneously with the proposed method of manufacturing the accumulator piston, the receptacle for the piston seal can be realized.
Weitere Vorteile oder vorteilhafte Weiterbildungen der Erfindung ergeben sich aus den Unteransprüchen oder der nachfolgenden Beschreibung. Ein umformtechnischer Herstellprozess ermöglicht die einfache und preisgünstige Darstellung von Bereichen unterschiedlicher Wandstärken am Speicherkolben. Insbesondere der hoch belastete Kolbenboden kann dadurch mit größerer Wandstärke hergestellt werden als der weniger belastete Schaft des Speicherkolbens (Anspruch 2). Gemäß Anspruch 3 kann die Aufnahme für die Kolbendichtung vorteilhafterweise derart bemessen werden, dass ihr Innendurchmesser gleichzeitig ein radiale Abstützung für das abschnittsweise im Inneren des Speicherkolbens angeordnete Rückstellelement bildet. Um zu verhindern, dass durch den umformtechnischen Herstellprozess des Speicherkolbens an dessen offenem Ende eine scharfe Kante entsteht, welche in die Wandung des Speichergehäuses einschneiden und die Beweglichkeit des Speicherkolbens behindern könnte, wird nach Anspruch 4 vorgeschlagen, die Kolbenwand abschnittsweise einzurollen. Reibungsmindernde Maßnahmen am Speicherkolben sind auch in den Unteransprüchen 5 und 6 beansprucht. Die Unteransprüche 7 und 8 beanspruchen vorteilhafte Ausgestaltungen für das Speichergehäuse und insbesondere für die Verankerung eines das Speichergehäuse verschließenden Deckels. Da Fahrzeugbremsanlagen aus Sicherheitsgründen üblicherweise mehrere Bremskreise aufweisen und weil für jeden Bremskreis mindestens ein eigener Druckmittelspeicher vorhanden ist, wird in Anspruch 9 eine Speichereinheit aus mehreren Druckmittelspeichern beansprucht, bei der die Speichergehäuse von einem gemeinsamen Deckel verschlossen sind. Dies spart Einzelteile und Montageaufwand ein. Anspruch 10 gibt als bevorzugtes Herstellungsverfahren für einen umformtechnisch hergestellten Speicherkolben ein Tiefziehverfahren und für die Aufnahme der Kolbendichtung am Speicherkolben ein Rollierverfahren an und schlägt darüber hinaus vor, diese beiden Verfahrensschritte aus Kostengründen gleichzeitig in einem kombinierten Arbeitsgang durchzuführen.Further advantages or advantageous developments of the invention will become apparent from the dependent claims or the description below. A forming process manufacturing process allows the simple and inexpensive representation of areas of different wall thicknesses on the accumulator piston. In particular, the highly loaded piston crown can thereby be made with greater wall thickness than the less loaded shaft of the accumulator piston (claim 2). According to claim 3, the receptacle for the piston seal advantageously be dimensioned such that its inner diameter simultaneously forms a radial support for the partially arranged in the interior of the accumulator piston return element. In order to prevent that by the forming process manufacturing process of the accumulator piston at the open end of a sharp edge is formed, which could cut into the wall of the storage enclosure and impede the mobility of the accumulator piston, it is proposed according to claim 4, the piston wall in sections curl. Friction reducing measures on the accumulator piston are also claimed in the subclaims 5 and 6. The dependent claims 7 and 8 claim advantageous embodiments of the storage enclosure and in particular for the anchoring of the storage enclosure occlusive lid. Since vehicle brake systems usually have a plurality of brake circuits for safety reasons, and because at least one separate pressure fluid reservoir is provided for each brake circuit, a memory unit is claimed in claim 9 from a plurality of pressure fluid reservoirs, wherein the memory housing are closed by a common cover. This saves individual parts and assembly costs. Claim 10 is as a preferred manufacturing process for a storage piston produced by forming a deep-drawing process and for receiving the piston seal on the accumulator piston a rolling method and also proposes to carry out these two steps for cost reasons simultaneously in a combined operation.
Zeichnungdrawing
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Die Figur 1 zeigt eine Speichereinheit aus - A -An embodiment of the invention is illustrated in the drawing and explained in more detail in the following description. FIG. 1 shows a memory unit - A -
insgesamt zwei Druckmittelspeichern im Längsschnitt, in Figur 2 ist eine vorteilhafte Ausgestaltung eines Speicherkolbens als Detailvergrößerung dargestellt.a total of two pressure fluid reservoirs in longitudinal section, in Figure 2, an advantageous embodiment of a storage piston is shown as an enlarged detail.
Beschreibung des AusfuhrungsbeispielsDescription of the exemplary embodiment
Figur 1 zeigt einen Ausschnitt eines Gehäuses 10 eines Hydroaggregats einer schlupfgeregelten Fahrzeugbremsanlage. Das Gehäuse 10 wird von einem Metallblock 12 gebildet, an dem Einbauräume unter anderem für Magnetventile, Pumpen, eines Pumpenantriebs und von Druckmittelspeichern 14 vorgesehen sind. In der Figur 1 sind lediglich die Druckmittelspeicher 14 dargestellt, da die übrigen Komponenten für das Verständnis der Erfindung ohne Belang sind. Da Fahrzeugbremsanlagen üblicherweise aus Sicherheitsgründen zumindest zweikreisig ausgeführt sind, ist in Figur 1 eine Speichereinheit aus insgesamt zwei Druckmittelspeichern 14 dargestellt. Die Funktion der Druckmittelspeicher 14 innerhalb einer schlupf geregelten Fahrzeugbremsanlage wurde bereits eingangs erläutert.Figure 1 shows a section of a housing 10 of a hydraulic unit of a slip-controlled vehicle brake system. The housing 10 is formed by a metal block 12, on which installation spaces are provided, inter alia, for solenoid valves, pumps, a pump drive and accumulators 14. In the figure 1, only the pressure fluid reservoir 14 are shown, since the other components for the understanding of the invention are irrelevant. Since vehicle brake systems are usually designed to be at least two-circuited for safety reasons, a memory unit of a total of two pressure fluid reservoirs 14 is shown in FIG. The function of the accumulator 14 within a slip-controlled vehicle brake system has already been explained above.
Die Speichergehäuse 16 der Druckmittelspeicher 14 werden von zwei getrennten Sacklochbohrungen gebildet. Letztere gehen von einer gemeinsamen Umfangsfläche des Metallblocks 12 aus und haben beispielhaft parallel zueinander verlaufende Längsachsen. Die nach außen weisenden Öffnungen der Speichergehäuse 16 sind von einem gemeinsamen Deckel 18 verschlossen. Dieser ist im Ausführungsbeispiel mit Hilfe von Befestigungsmitteln 20, beispielsweise Schrauben, am Metallblock 12 verankert. Das Befestigungsmittel 20 dient darüber hinaus zur Fixierung eines Lagerelements 22 am Metallblock 12. Das Lagerelement 22 ist im wesentlichen aus einem Schwingungen dämpfenden Elastomer hergestellt und dient zusammen mit weiteren am Gehäuse 10 vorgesehenen Lagerelementen 22 zur schwingungsentkoppelten Lagerbarkeit des Hydroaggregats im Fahrzeug, beispielsweise in einen dafür vorgesehenen Halter (nicht dargestellt). Zusätzlich oder anstelle der Schrauben zur Verankerung des Deckels 18 der Speichergehäuse 16 wäre es vorstellbar, am Metallblock 12 Nuten-Paare 24a,24b vorzusehen, die quer zur Längsachse dieser Speichergehäuse 16 verlaufen und die dazu vorgesehen sind, einen streifenförmig ausgebildeten Deckel 18 aufzunehmen, der sich in diese Nuten-Paare 24 einschieben lässt. Der Deckel 18 würde in diesem Fall durch eine Abstützung von im Folgenden noch zu beschreibenden Rückstellelementen 26 der Druckmittelspeicher 14 auf seiner Innenseite lagefixiert. Selbstverständlich könnte der Deckel 18 auch ohne Befestigungsmittel umformtechnisch, beispielsweise durch Verstemmen des Metallblocks 12 oder durch plastisches Verformen des Deckels 18 selbst in einer dafür vorgesehenen Aufnahme des Metallblocks 12 befestigt sein. Für jedes Speichergehäuse 16 könnte auch ein separater Deckel 18 vorgesehen werden.The storage housing 16 of the accumulator 14 are formed by two separate blind holes. The latter start from a common peripheral surface of the metal block 12 and have, for example, parallel longitudinal axes. The outwardly facing openings of the storage housing 16 are closed by a common cover 18. This is anchored in the embodiment by means of fastening means 20, such as screws, on the metal block 12. The mounting member 20 is also used for fixing a bearing element 22 on the metal block 12. The bearing element 22 is essentially made of a vibration damping elastomer and is used together with other provided on the housing 10 bearing elements 22 for vibration-decoupled storage of the hydraulic unit in the vehicle, for example in a provided holder (not shown). In addition to or instead of the screws for anchoring the cover 18 of the storage enclosure 16, it would be conceivable to provide on the metal block 12 pairs of grooves 24a, 24b which extend transversely to the longitudinal axis of these storage enclosures 16 and which are intended to receive a strip-shaped cover 18 which can be inserted into these groove pairs 24. In this case, the lid 18 would be fixed in position on its inner side by a support of restoring elements 26, to be described below, of the accumulator 14. Of course, the lid 18 could be fixed without forming material, for example, by caulking the metal block 12 or by plastic deformation of the lid 18 even in a designated receptacle of the metal block 12. For each storage enclosure 16, a separate lid 18 could also be provided.
Der Metallblock 12 ist mit Druckmittel führenden Bohrungen 28 durchzogen, die quer zur Längsachse der Speichergehäuse 16 verlaufen. Die Bohrungen 28 sind über Stichkanäle 30 mit dem Inneren der Speichergehäuse 16 verbunden und stellen somit die Druckmittelversorgung der Druckmittelspeicher 14 sicher. Beim dargestellten Ausführungsbeispiel münden exemplarisch jeweils zwei Stichkanäle 30 in ein Speichergehäuse 16 ein.The metal block 12 is passed through pressure medium-carrying bores 28 which extend transversely to the longitudinal axis of the storage housing 16. The holes 28 are connected via branch channels 30 with the interior of the storage housing 16 and thus ensure the pressure medium supply of the pressure fluid reservoir 14 safely. In the illustrated embodiment, two puncture channels 30 open into a storage housing 16 by way of example.
In jedem dieser Speichergehäuse 16 ist ein Speicherkolben 32 axial beweglich aufgenommen. Dieser Speicherkolben 32 ist topfförmig ausgebildet und weist entsprechend einen zylindrischen Schaft 32a und einen den Schaft 32a an einem Ende verschließenden Boden 32b auf. Der Speicherkolben 32 wirkt mit dem Rückstellelement 26 in Form einer Druckfeder zusammen, welche den Speicherkolben 32 in die dargestellte Grundstellung drückt. In dieser Grundstellung liegt der Speicherkolben 32 mit seinem Boden 32b auf Block mit dem geschlossenen Ende des Speichergehäuses 16. Das Rückstellelement 26 stützt sich dazu einerseits auf der Innenseite des Bodens 32b des Speicherkolbens 32 ab und dazu gegenüberliegend an dem das Speichergehäuse nach außen verschließenden Deckel 18. Erfindungsgemäß weist der Speicherkolben 32 am Umfang seines Schafts eine angeformte Aufnahme 32c auf. In diese Aufnahme 32c ist eine Kolbendichtung 34 eingesetzt, welche in Wirkverbindung mit der Innenwand des Speichergehäuses 16 und mit dem Schaft 32a des Speicherkolbens 32 zwei Speicherkammern 36a, 36b gegeneinander abdichtet. Die vom Schaft 32a des Speicherkolbens 32 abgewandt liegende erste Speicherkammer 32a ist, wie erwähnt, über die Stichkanäle 30 mit hydraulischem Druckmittel befüllbar, während die zweite Speicherkammer 36b belüftet ist und das Rückstellelement 26 aufnimmt. Als Kolbendichtung 34 ist exemplarisch ein konventioneller O-Ring eingesetzt.In each of these storage housing 16, a storage piston 32 is received axially movable. This accumulator piston 32 has a cup-shaped design and accordingly has a cylindrical shaft 32a and a bottom 32b closing the shaft 32a at one end. The accumulator piston 32 cooperates with the return element 26 in the form of a compression spring which presses the accumulator piston 32 in the illustrated basic position. In this basic position, the accumulator piston 32 lies with its bottom 32b in block with the closed end of the accumulator housing 16. The restoring element 26 is supported on the one hand on the inside of the bottom 32b of the accumulator piston 32 and on the opposite side to the cover 18 which closes the accumulator housing to the outside According to the invention, the accumulator piston 32 has an integrally formed receptacle 32c on the circumference of its shaft. In this receptacle 32c, a piston seal 34 is inserted, which in communication with the inner wall of the storage housing 16 and the shaft 32a of the accumulator piston 32, two storage chambers 36a, 36b against each other. The first storage chamber 32a facing away from the shaft 32a of the accumulator piston 32 is, as mentioned, filled with hydraulic pressure medium via the branch channels 30, while the second accumulator chamber 36b is ventilated and receives the return element 26. As a piston seal 34, a conventional O-ring is used as an example.
Figur 2 zeigt den Speicherkolben 32 nochmals im Detail. Erfindungsgemäß ist der Speicherkolben 32 umformtechnisch, vorzugsweise in einem Tiefziehverfahren hergestellt. Er weist eine im Verhältnis zu seinem Außendurchmesser gleichmäßig geringe Wandstärke auf und nimmt entsprechend wenig Bauraum in Anspruch. Dementsprechend groß ist der für das Rückstellelement 26 verbleibende Einbauraum innerhalb des Speichergehäuses 16.Figure 2 shows the accumulator piston 32 again in detail. According to the invention, the storage piston 32 is produced by forming, preferably in a deep-drawing process. He has a uniform in relation to its outer diameter low wall thickness and takes correspondingly little space to complete. The installation space remaining within the storage housing 16 is correspondingly large for the restoring element 26.
Kostenneutral wäre es auch darstellbar, die Wandstärke des Speicherkolbens 32 an die auftretenden Belastungen anzupassen. Dementsprechend könnte der Boden 32b des Speicherkolbens 32 auch eine größere Wandstärke aufweisen als der Schaft 32a. Dies ist in Figur 1 anhand des rechten der beiden Speicherkolben 32 dargestellt .Cost-neutral, it would also be possible to adjust the wall thickness of the accumulator piston 32 to the loads occurring. Accordingly, the bottom 32b of the accumulator piston 32 could also have a greater wall thickness than the shaft 32a. This is shown in FIG. 1 on the basis of the right-hand of the two accumulator pistons 32.
Die Aufnahme 32c am Außenumfang des Speicherkolbens 32 ist erfϊndungsgemäß umformtechnisch hergestellt. Insbesondere ein Rollierverfahren, wie es beispielsweise auch zur Darstellung von Glühbirnensockeln eingesetzt wird, ist hierfür geeignet. Die Herstellung des Speicherkolbens 32 und der Aufnahme 32c kann aus Kostengründen in einem kombinierten Arbeitsgang durchgeführt werden. Die Abmessungen der Aufnahme 32c, der Kolbendichtung 34 und des Rückstellelements 26 sind vorzugsweise derart aufeinander abgestimmt, dass der Innendurchmesser Dl der Aufnahme 32c nur geringfügig größer ist als der Außendurchmesser D2 des Rückstellelements 26, wodurch die Aufnahme 32c als radiale Abstützung für dieses Rückstellelement 26 wirkt. Die Aufnahme 32c für die Kolbendichtung 34 ist vorzugsweise in der Nähe des Bodens 32b des Speicherkolbens 32 angeordnet. Die sich zu beiden Seiten der Aufnahme 32c in axialer Richtung anschließenden Abschnitte 32d und 32e des Schafts 32a des Speicherkolbens 32 haben vorzugsweise den selben Außendurchmesser und bilden zwei axial beabstandete Führungen, welche die Bewegung des Speicherkolbens 32 in der Sacklochbohrung 16 des Speichergehäuses sicherstellen, indem sie einem Kippen oder Klemmen des Speicherkolbens 32 entgegen wirken.The receptacle 32c on the outer circumference of the accumulator piston 32 is erfϊndungsgemäß made by forming technology. In particular, a roller burnishing method, as it is also used for example for the representation of bulb sockets, is suitable for this purpose. The production of the accumulator piston 32 and the receptacle 32c can be carried out for cost reasons in a combined operation. The dimensions of the receptacle 32c, the piston seal 34 and the return element 26 are preferably coordinated such that the inner diameter Dl of the receptacle 32c is only slightly larger than the outer diameter D2 of the return element 26, whereby the receptacle 32c acts as a radial support for this return element 26 , The receptacle 32 c for the piston seal 34 is preferably arranged in the vicinity of the bottom 32 b of the accumulator piston 32. The adjoining on both sides of the receptacle 32c in the axial direction sections 32d and 32e of the shaft 32a of the accumulator piston 32 preferably have the same outer diameter and form two axially spaced guides, which ensure the movement of the accumulator piston 32 in the blind hole 16 of the storage enclosure by counteract tilting or jamming of the accumulator piston 32.
Zur Verbesserung der Reibungsverhältnisse zwischen Speicherkolben 32 und Speichergehäuse können diese Führungen bildenden Abschnitte 32d und 32e mit einer reibungsvermindernden Beschichtung 33, beispielsweise einer Lackierung versehen sein. Auch an den Führungen befestigte Klebefolien aus druckmittelresistentem und reibungsverminderndem Material sind hierfür vorstellbar.To improve the friction conditions between the accumulator piston 32 and the accumulator housing, these guide-forming sections 32d and 32e may be provided with a friction-reducing coating 33, for example a lacquer. Also attached to the guides adhesive sheets of pressure medium-resistant and friction-reducing material are conceivable for this purpose.
Das offene Ende des Speicherkolbens 32 kann zur weiteren Verbesserung der Gleiteigenschaften des Speicherkolbens 32 einen nach innen eingerollten Bereich 32f aufweisen, wie er in Figur 2 erkennbar ist. Scharfkantige Ecken am Speicherkolben 32, welche in die Wandung der Sacklochbohrung 16 des Speichergehäuses einschneiden könnten, werden dadurch vermieden.The open end of the accumulator piston 32 may have an inwardly curled portion 32f as shown in FIG. 2 to further enhance the sliding properties of the accumulator piston 32. Sharp-edged corners on the storage piston 32, which could cut into the wall of the blind hole 16 of the storage enclosure, thereby avoided.
Selbstverständlich sind Änderungen oder Ergänzungen am beschriebenen Ausfuhrungsbeispiel denkbar, ohne vom Grundgedanken der Erfindung abzuweichen. Of course, changes or additions to the described exemplary embodiment are conceivable without deviating from the basic idea of the invention.

Claims

Ansprüche claims
1. Druckmittelspeicher, insbesondere für eine elektronisch schlupfgeregelte Fahrzeugbremsanlage, mit einem Speichergehäuse (16), in dem ein Speicherkolben (32) entgegen der Kraft eines Rückstellelements (26) axial verschiebbar angeordnet ist, wobei der Speicherkolben (32) in einer umfangseitig umlaufenden Aufnahme (32c) eine Kolbendichtung (34) aufweist, die das Innere des Druckmittelspeichers (14) in zwei getrennte Speicherkammern (36a, 36b) teilt, wobei eine der beiden Speicherkammern (36a) mit hydraulischem Druckmittel befüllbar ist, dadurch gekennzeichnet, dass der Speicherkolben (32) ein einteiliges, spanlos aus einem Blechmaterial umgeformtes Bauteil ist, dessen Aufnahme (32c) für die Kolbendichtung (34) spanlos am Speicherkolben (32) angeformt ist.1. accumulator, in particular for an electronically slip-controlled vehicle brake system, with a storage housing (16) in which a storage piston (32) against the force of a restoring element (26) is arranged axially displaceable, wherein the accumulator piston (32) in a peripheral circumferential recording ( 32c) has a piston seal (34) which divides the interior of the accumulator (14) into two separate storage chambers (36a, 36b), wherein one of the two accumulator chambers (36a) can be filled with hydraulic pressure medium, characterized in that the accumulator piston (32 ) is a one-piece, non-cutting formed from a sheet material component, the receptacle (32c) for the piston seal (34) without cutting on the accumulator piston (32) is integrally formed.
2. Druckmittelspeicher nach Anspruch 1, dadurch gekennzeichnet, dass der Speicherkolben (32) einen zylindrischen Schaft (32a) aufweist, der von einem Kolbenboden (32b) an einem Ende verschlossen ist, wobei der Schaft (32a) und der Boden (32b) unterschiedliche Wandstärken haben.2. accumulator according to claim 1, characterized in that the accumulator piston (32) has a cylindrical shaft (32 a) which is closed by a piston head (32 b) at one end, said shaft (32 a) and the bottom (32 b) different Wall thicknesses have.
3. Druckmittelspeicher nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das Rückstellelement (26) zumindest abschnittsweise im Inneren des Speicherkolbens (32) angeordnet ist und in seinem Außendurchmesser (D2) auf den Innendurchmesser (Dl) der Aufnahme (32c) für die Kolbendichtung (34) derart abgestimmt ist, dass die Aufnahme (32c) eine radiale Abstützung für das Rückstellelement (34) bildet. 3. accumulator according to claim 1 or 2, characterized in that the restoring element (26) at least partially in the interior of the accumulator piston (32) is arranged and in its outer diameter (D2) on the inner diameter (Dl) of the receptacle (32c) for the piston seal (34) is tuned such that the receptacle (32c) forms a radial support for the return element (34).
4. Druckmittelspeicher nach Anspruch 2, dadurch gekennzeichnet, dass der zylindrische Schaft (32a) des Speicherkolbens (32) an seinem vom Boden (32b) abgewandten Bereich (32f) abschnittsweise nach innen eingerollt ist.4. accumulator according to claim 2, characterized in that the cylindrical shaft (32 a) of the accumulator piston (32) at its side facing away from the bottom (32 b) portion (32 f) is partially rolled inwards.
5. Druckmittelspeicher nach einem der Ansprüche 2 bis 4, dadurch gekennzeichnet, dass die sich axial an die Aufnahme (32c) für die Kolbendichtung (34) anschließenden Abschnitte (32d, 32e) des Schafts (32a) zueinander beabstandete Führungen für den Speicherkolben (32) im Speichergehäuse bilden, wobei diese Führungen mit einer reibungsvermindernden Beschichtung (33) versehen sind.5. Pressure fluid accumulator according to one of claims 2 to 4, characterized in that the axially of the receptacle (32c) for the piston seal (34) adjoining sections (32d, 32e) of the shaft (32a) mutually spaced guides for the accumulator piston (32nd ) in the storage housing, these guides are provided with a friction-reducing coating (33).
6. Druckmittelspeicher nach Anspruch 5, dadurch gekennzeichnet, dass die reibungsvermindernde Beschichtung (33) von einer Lackierung und/oder einer Klebefolie mit reibungsmindernden Eigenschaften gebildet ist.6. accumulator according to claim 5, characterized in that the friction-reducing coating (33) is formed by a coating and / or an adhesive film with friction-reducing properties.
7. Druckmittelspeicher nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass das Speichergehäuse (16) gebildet ist von einer Sacklochbohrung in einem Metallblock (12), deren nach außen offenes Ende von einem Deckel (18) verschlossen ist, wobei sich an der Innenseite des Deckels (18) das Rückstellelement (26) abstützt und dass der Deckel (18) am Metallblock (12) durch Befestigungsmittel (20) verankert ist, mit denen gleichzeitig Mittel (22) zur schwingungsgedämpften Lagerbarkeit des Metallblocks (12) fixiert sind.7. accumulator according to one of claims 1 to 6, characterized in that the storage housing (16) is formed by a blind hole in a metal block (12) whose outwardly open end of a lid (18) is closed, wherein at the Inside the lid (18) the restoring element (26) is supported and that the lid (18) on the metal block (12) by means of anchoring (20) is anchored, with which simultaneously means (22) for vibration-damped storage of the metal block (12) are fixed.
8. Druckmittelspeicher nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass das Speichergehäuse (16) gebildet ist von einer Sacklochbohrung in einem Metallblock (12), deren nach außen offenes Ende von einem Deckel (18) verschlossen ist, wobei sich an der Innenseite des Deckels (18) das Rückstellelement (26) abgestützt ist und dass am Metallblock (12) quer zur Längsachse der Sacklochbohrung verlaufende Nuten-Paare (24a, 24b) ausgebildet sind, in die der Deckel (18) einschiebbar ist.8. accumulator according to one of claims 1 to 6, characterized in that the storage housing (16) is formed by a blind hole in a metal block (12) whose outwardly open end of a lid (18) is closed, wherein at the Inside the lid (18) the return element (26) is supported and in that on the metal block (12) transverse to the longitudinal axis of the blind hole extending groove pairs (24a, 24b) are formed, in which the lid (18) can be inserted.
9. Speichereinheit aus mehreren Druckmittelspeichern (14) nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass die Speichergehäuse (16) gebildet sind von Sacklochbohrungen in einem Metallblock (12) wobei deren Öffnungen durch einen gemeinsamen Deckel (18) verschlossen sind. 9. Storage unit of a plurality of pressure medium reservoirs (14) according to one of claims 1 to 8, characterized in that the storage housing (16) are formed by blind holes in a metal block (12) wherein the openings are closed by a common cover (18).
10. Verfahren zur Herstellung eines Druckmittelspeichers (14) entsprechend den Merkmalen eines der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass der Speicherkolben (32) durch Tiefziehen und die Aufnahme (32c) für die Kolbendichtung (34) durch Rollieren hergestellt werden. 10. A method for producing a pressure medium reservoir (14) according to the features of one of claims 1 to 8, characterized in that the storage piston (32) by deep drawing and the receptacle (32c) for the piston seal (34) are prepared by rolling.
EP06708400A 2005-04-04 2006-02-21 Pressure medium accumulator, accumulator unit comprising a plurality of pressure medium accumulators and method for manufacturing a pressure medium accumulator Withdrawn EP1869328A1 (en)

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DE102005015262A DE102005015262A1 (en) 2005-04-04 2005-04-04 Pressurized medium accumulator for electronically slip-regulated vehicle brake assembly, has piston with gasket that divides accumulator into separate chambers, where piston is single-piece chipless component made of sheet metal material
PCT/EP2006/060119 WO2006106011A1 (en) 2005-04-04 2006-02-21 Pressure medium accumulator, accumulator unit comprising a plurality of pressure medium accumulators and method for manufacturing a pressure medium accumulator

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CN101160469A (en) 2008-04-09
WO2006106011A1 (en) 2006-10-12

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