EP0907030A1 - Accumulateur, surtout pour système de freinage de véhicule. - Google Patents

Accumulateur, surtout pour système de freinage de véhicule. Download PDF

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Publication number
EP0907030A1
EP0907030A1 EP97117222A EP97117222A EP0907030A1 EP 0907030 A1 EP0907030 A1 EP 0907030A1 EP 97117222 A EP97117222 A EP 97117222A EP 97117222 A EP97117222 A EP 97117222A EP 0907030 A1 EP0907030 A1 EP 0907030A1
Authority
EP
European Patent Office
Prior art keywords
chamber
pressure medium
separating piston
seal
pump
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Withdrawn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
EP97117222A
Other languages
German (de)
English (en)
Inventor
Hans-Jörg Feigel
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.)
Continental Teves AG and Co OHG
Original Assignee
Continental Teves AG and Co OHG
ITT Manufacturing Enterprises LLC
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 Continental Teves AG and Co OHG, ITT Manufacturing Enterprises LLC filed Critical Continental Teves AG and Co OHG
Priority to EP97117222A priority Critical patent/EP0907030A1/fr
Publication of EP0907030A1 publication Critical patent/EP0907030A1/fr
Withdrawn legal-status Critical Current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
    • F15B1/24—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor with rigid separating means, e.g. pistons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B11/00—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation
    • F04B11/0008—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using accumulators
    • F04B11/0016—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using accumulators with a fluid spring
    • 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
    • F15B2201/31—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
    • F15B2201/40—Constructional details of accumulators not otherwise provided for
    • F15B2201/41—Liquid ports
    • 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
    • F15B2201/40—Constructional details of accumulators not otherwise provided for
    • F15B2201/415—Gas ports
    • F15B2201/4155—Gas ports having valve means

Definitions

  • the invention relates to a pressure medium reservoir, in particular for vehicle braking systems, with a housing in which a separating piston is slidably guided, the separating piston a first, connected to the pressure medium supply Chamber from a second chamber filled with gas separates, and with first and second on the circumference of the separating piston arranged seals that the first and the second Seal the chamber and form a third chamber between them.
  • Such a pressure medium reservoir is from EP-A 0 417 440 known.
  • That pressure medium, such as brake fluid or the like, in the gas space is introduced is between the two on the circumference of the separating piston arranged piston sealing rings a collecting space intended.
  • the cavity is covered by a an inner bore of the separating piston guided longitudinally Secondary pistons limited.
  • the object of the invention is therefore a long life the pressure fluid reservoir while maintaining its preload and capacity to ensure without gas from outside must be supplied.
  • This object is essentially achieved with the invention solved that the chamber between the first seal and the second seal with one by the working movement of the Separating piston operated pump device for return of gas escaping from the second chamber is connected, and that the pump device e.g. by one between the scope of the separating piston and the pump chamber is formed by a check valve with the second Chamber is connected and its volume corresponding to that Movement of the separating piston is changeable.
  • the gas space formed by the second chamber escaped gas volume is caused by the movement of the separating piston conveyed back into the gas space, using the check valve easy entry of the gas to be recycled into the Gas space allowed while preventing gas from escaping locks the gas space.
  • the escape is therefore only in the previous usual framework of a slight diffusion.
  • the pump device works on the displacement principle. Since the Drive the pump device via the working movement of the If the piston is separated, the gas pressure accumulator is self-pumping and an additional energy supply is not necessary.
  • the Biasing in the gas space is automatically done without loss of capacity maintained so that the storage of gas volume to achieve a long lifespan and the Storage can be made smaller and lighter. A Maintenance is not necessary. Because of the automatic Return of the escaped gas volume can also Manufacturing quality requirements are reduced.
  • Pump chamber between steps in the outer surface of the separating piston and the housing can have a defined pressure space Construction of the for the return of the gas in the gas space required pressure can be determined.
  • the pump chamber is preferably opposite the third chamber sealed by a third seal, the third Seal the function of an inlet valve device for the Pump room can take over.
  • the separating piston moves back gas can escape from the third chamber during storage discharge enter the pump chamber (suction process) so that part of the in the third chamber the existing gas molecules with the be pumped back next pumping .
  • the third chamber can also serve as a catchment area for any from the first chamber entrained pressure medium serve to prevent this gets into the gas space.
  • the second and / or the third seal are expedient Lip seals with check valve function to without additional elements a clear direction of the gas to ensure.
  • the third chamber has a fourth chamber connected, which is an extension of the third Represents chamber and as a reservoir for filling the pump chamber serves during the return movement of the separating piston.
  • the fourth chamber is in the Separating pistons designed so that they have no additional volume claimed.
  • the second and / or third seal are fixed connected to the separating piston and movable with it.
  • the fourth Chamber arranged around the housing so that the internal volume of the separating piston designed as a hollow piston and thus the Storage capacity can be increased.
  • the second and / or third seal preferably firmly connected to the housing, so that the Displacement of the separating piston also does not conflict with the Connection opening between the third and fourth chambers is caused.
  • the sophisticated sealing surface of the seals on the Shell surface of the separating piston are formed.
  • the pump device can be hydraulic, be driven electrically or pneumatically, being a hydraulic drive preferably with the first chamber connected pressure medium supply uses.
  • a pressure medium reservoir 1 according to a first embodiment shown with horizontal extending longitudinal axis is arranged.
  • the pressure fluid reservoir 1 has a housing 2 which is sealed in a storage socket 3 is screwed in. Inside the housing 2 is a separating piston 4 guided longitudinally.
  • the separating piston 4 separates a first chamber 5, which via a hydraulic connection 6 to a pressure medium supply, not shown, is connected by a second chamber 7 with a predetermined pressure Compressed gas (precharge pressure), for example nitrogen or the like is filled.
  • predetermined pressure Compressed gas for example nitrogen or the like is filled.
  • a pressure medium for example Brake fluid, insertable or removable from it.
  • the separating piston 4 has a first seal 8 on its circumference on the first chamber 5 is to be sealed in order ensure that no brake fluid from the first Chamber 5 can escape.
  • the separating piston 4 is opened to the second chamber 7 Hollow piston formed to the volume of the second chamber 7 increase.
  • the separating piston 4 in has on its outer surface its associated with the second chamber 7 end portion second seal 9, which seals the second chamber 7 and prevent gas from escaping from the second chamber 7 should.
  • a third Chamber 10 formed under a low pressure, preferably atmospheric pressure.
  • a pump chamber 12 is divided via a third seal 11, through steps 13, 14 in the outer surface of the separating piston 4 or the inner wall of the housing 2 is limited.
  • the third chamber 10 Between the first seal 8 and the third seal 11 is the third chamber 10 via a pneumatic connecting line 15 with a fourth chamber 16 in formed in the separating piston 4 Connection which is an extension of the third chamber 10 represents.
  • the second and third seals 9, 11 are lip seals trained with check valve function so that they only a gas passage in one direction (in the drawing after right). All seals 8, 9 and 11 are in corresponding receiving grooves 17, 18, 19 in the lateral surface of the Separating piston 4 arranged and with this within the housing 2 sliding.
  • the pump device works here according to the displacement principle, the drive of the pump device by the working movement of the separating piston 4.
  • the (movable) piston of the pump device is controlled by the Step 13 formed on the outer surface of the separating piston 4, while the (standing) cylinder space through a stepped bore is formed in the housing 2.
  • hydraulic fluid via the hydraulic connection 6 introduced into the first chamber 5, so the Separating piston 4 moved to the right in the drawing.
  • the volume of the pump chamber 12 decreases, and that in it contained, escaped from the second chamber 7 is over the outlet valve formed by the second seal 9 in the second chamber 7 pumped back.
  • the separating piston 4 in the drawing to the left moved back, whereby the pump chamber 12 increases its volume.
  • the third seal 11 acts as an inlet valve, about the gas from the third chamber 10 and with this flow connected fourth chamber 16 back into the pump chamber 12 can.
  • second seal 9 By acting as a check outlet valve second seal 9 is hereby prevented that gas from the second chamber 7 can flow into the pump chamber 12.
  • the self-pumping pressure medium reservoir 1 gas volume escaping from the second chamber 7 automatically fed back so that the preload during the life of the pressure medium storage 1 is retained.
  • a stockpile the gas volume to extend the service life can be omitted, since no gas from the second chamber 7 into the atmosphere diffuses. Since the gas from the second chamber 7 at most in the pump chamber 12 arrives and out of this directly no gas can be pumped back from the second chamber 7 into the brake fluid contained in the first chamber 5 diffuse so that gas bubbles form in the braking system is prevented.
  • the pressure medium reservoir can be smaller and be dimensioned more easily. May also be possible manufacturing quality requirements are reduced.
  • the pressure medium reservoir 20 shown in FIG. 2 corresponds essentially that of the first embodiment. On a renewed detailed description of corresponding parts therefore waived.
  • the pressure medium reservoir 101 according to the second embodiment differs from the pressure medium reservoir 1 according to the first embodiment essentially in that the fourth Chamber 116 not in the separating piston 104, but through a jacket 120 limited to that screwed into the storage base 103 Housing 102 is arranged around.
  • the jacket 120 is opposite the housing 102 shown with a seal 121 and a in the housing 102 formed connecting line 115 with the third chamber 110 connected.
  • the separating piston 104 which is more open to the second chamber 107 Hollow piston is formed, can be made easier become. Also, the capacity of the second chamber 107 significantly increased.
  • the connecting line 115 of the third chamber 110 to the fourth chamber 116 in this embodiment is not in the moving separating piston 104, but in the standing housing 102, the first, second and third Seals 108, 109, 111 in corresponding receiving grooves 117, 118, 119 added to the inner wall of the housing 102, so that it does not become one when the separating piston 104 is displaced Damage in particular to the lip seal 111 by the Connection line 115 comes.
  • the functioning of the pressure medium reservoir 101 according to the second embodiment corresponds otherwise to that of the pressure medium accumulator 1 according to the first embodiment, so that there is no need to go into this in detail.
  • FIG. 3 Another embodiment variant according to FIG. 3 is that the pump chamber 12 is arranged in the separating piston 4 and the Fixed pump piston 20 on the gas chamber side with the housing 2 is connected, or is supported. Less cheap, but also possible, the arrangement of the pump chamber 12 in the housing 2 and the hollow piston is attached to the separating piston 4. All others Features evident from FIG. 3 correspond to those for this equivalent details of the preceding parts of the description to Fig. 1,2 at least in their function.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
EP97117222A 1997-10-04 1997-10-04 Accumulateur, surtout pour système de freinage de véhicule. Withdrawn EP0907030A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP97117222A EP0907030A1 (fr) 1997-10-04 1997-10-04 Accumulateur, surtout pour système de freinage de véhicule.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP97117222A EP0907030A1 (fr) 1997-10-04 1997-10-04 Accumulateur, surtout pour système de freinage de véhicule.

Publications (1)

Publication Number Publication Date
EP0907030A1 true EP0907030A1 (fr) 1999-04-07

Family

ID=8227441

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97117222A Withdrawn EP0907030A1 (fr) 1997-10-04 1997-10-04 Accumulateur, surtout pour système de freinage de véhicule.

Country Status (1)

Country Link
EP (1) EP0907030A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1236909A1 (fr) * 2001-02-21 2002-09-04 Robert Bosch Gmbh Accumulateur de pression à fluide, en particulier pour un système hydraulique de freinage d'un véhicule, et méthode d'assemblage dudit accumulateur
EP1239196A3 (fr) * 2001-03-08 2004-09-15 Carl Freudenberg KG Accumulateur à piston
CN108278226A (zh) * 2018-01-19 2018-07-13 西南石油大学 一种活塞式深海用水下蓄能器
DE102018001104A1 (de) * 2018-02-09 2019-08-14 Hydac Technology Gmbh Kolbenspeicher

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1450347A1 (de) * 1964-10-22 1969-03-13 Baumgarten Hydrotech Abdichtung fuer Kolben von hydraulischen oder pneumatischen Zylindern
JPS6148601A (ja) * 1984-08-11 1986-03-10 Aisin Warner Ltd アキュ−ムレ−タ
DE3930556A1 (de) * 1989-09-13 1991-03-14 Bosch Gmbh Robert Druckmittelspeicher, insbesondere fuer fahrzeug-bremsanlagen
EP0417440A1 (fr) 1989-09-13 1991-03-20 Robert Bosch Gmbh Accumulateur à fluide, en particulier pour circuits de freinage de véhicules

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1450347A1 (de) * 1964-10-22 1969-03-13 Baumgarten Hydrotech Abdichtung fuer Kolben von hydraulischen oder pneumatischen Zylindern
JPS6148601A (ja) * 1984-08-11 1986-03-10 Aisin Warner Ltd アキュ−ムレ−タ
DE3930556A1 (de) * 1989-09-13 1991-03-14 Bosch Gmbh Robert Druckmittelspeicher, insbesondere fuer fahrzeug-bremsanlagen
EP0417440A1 (fr) 1989-09-13 1991-03-20 Robert Bosch Gmbh Accumulateur à fluide, en particulier pour circuits de freinage de véhicules

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 010, no. 207 (M - 500) 19 July 1986 (1986-07-19) *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1236909A1 (fr) * 2001-02-21 2002-09-04 Robert Bosch Gmbh Accumulateur de pression à fluide, en particulier pour un système hydraulique de freinage d'un véhicule, et méthode d'assemblage dudit accumulateur
EP1239196A3 (fr) * 2001-03-08 2004-09-15 Carl Freudenberg KG Accumulateur à piston
CN108278226A (zh) * 2018-01-19 2018-07-13 西南石油大学 一种活塞式深海用水下蓄能器
DE102018001104A1 (de) * 2018-02-09 2019-08-14 Hydac Technology Gmbh Kolbenspeicher
US11542962B2 (en) 2018-02-09 2023-01-03 Hydac Technology Gmbh Piston accumulator
US12241482B2 (en) 2018-02-09 2025-03-04 Hydac Technology Gmbh Piston accumulator

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