EP0286777A2 - Unité piston-cylindre - Google Patents

Unité piston-cylindre Download PDF

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Publication number
EP0286777A2
EP0286777A2 EP88100290A EP88100290A EP0286777A2 EP 0286777 A2 EP0286777 A2 EP 0286777A2 EP 88100290 A EP88100290 A EP 88100290A EP 88100290 A EP88100290 A EP 88100290A EP 0286777 A2 EP0286777 A2 EP 0286777A2
Authority
EP
European Patent Office
Prior art keywords
piston
damping
sleeve
flow path
check valve
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Withdrawn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
EP88100290A
Other languages
German (de)
English (en)
Other versions
EP0286777A3 (fr
Inventor
Günter Peter
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.)
Gesellschaft fur Hydraulik-Zubehor Mbh
Original Assignee
Gesellschaft fur Hydraulik-Zubehor Mbh
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 Gesellschaft fur Hydraulik-Zubehor Mbh filed Critical Gesellschaft fur Hydraulik-Zubehor Mbh
Publication of EP0286777A2 publication Critical patent/EP0286777A2/fr
Publication of EP0286777A3 publication Critical patent/EP0286777A3/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Withdrawn legal-status Critical Current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
    • 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
    • F15B2201/411—Liquid ports having valve means
    • 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 piston-cylinder unit which has the features of the preamble of claim 1.
  • Piston-cylinder units of this type are already known in various designs and for different applications, for example in the form of single or double-acting working or control cylinders with end position damping or piston accumulators with end position damping.
  • units of this type on the one hand, it is required that the flow of the pressure oil to be displaced during the forward stroke of the piston is throttled sufficiently when the piston approaches the end position, so that the desired damping effect results.
  • the invention has for its object to provide a piston-cylinder unit of the type in question, which is characterized not only by a simple, a cheap manufacture possible structure, but also a quick response of the piston during the return stroke movement by a Actuation of the piston with a comparatively large volume flow of the pressure oil is ensured.
  • the piston together with the associated damping piston, provides the installation space for the flow path, via which the pressure oil, bypassing the damping gap, leads to the main piston surface to initiate the piston return stroke.
  • the arrangement is such that the damping piston forms a projecting sleeve which is open on the piston face and whose front opening serves as an inlet opening for the flow path containing the check valve and whose sleeve wall is at least at an axial distance from the front inlet opening has an opening which leads from the inside of the sleeve to the pressure space adjacent to the main piston surface and serves as an outlet opening of the flow path containing the check valve, which is arranged in the sleeve in the region between the inlet and outlet openings.
  • the damping piston designed as a sleeve forms the valve housing for the check valve.
  • a ring-plate valve is provided as a check valve
  • the movable valve plate is guided on the inner wall of the sleeve and the valve seat ring is arranged on the front end of the sleeve so that it defines the inlet opening with its ring bore
  • a particularly large valve cross-section is available for the flow path, namely the cross-section of a valve whose valve plate extends over the entire clear cross-sectional area of the interior of the sleeve, the inlet cross-section of the valve corresponding to the clear cross-sectional area of the ring bore of the valve seat ring.
  • hydropneumatic piston accumulator has a cylinder 1 with a rear, in the drawing lying top cylinder cover 3, which is secured by a screw ring 5, which is screwed to an internal thread 6 at the rear end of the cylinder 1.
  • the rear cylinder cover 3 has a central bore 7 which is provided with an internal thread into which a plug 9 forming a gas-tight closure of the bore 7 is screwed.
  • the latter has a central bore 11 with an internal thread, the outer mouth of which is closed gas-tight by a closure cover 13 screwed onto the stopper 9 from the outside.
  • a filling valve in the internal thread of the bore 11 of the stopper 9, a filling valve, not shown, can be screwed in after removing the closure cover 13, via which a gas pressure cushion of the desired pressure can be generated in the gas space 14, which is located between the cylinder cover 3 and a piston 15 which is freely movable in the cylinder 1 .
  • the rear cylinder cover 3 and the piston 15 are opposite the inner wall of the cylinder 1 by means of sealing rings 17 and 19, respectively sealed.
  • the cylinder 1 also has an internal thread 21, to which a front cylinder cover 23 is screwed, which is sealed off from the inner wall of the cylinder 1 by a sealing ring 24.
  • the cylinder cover 23 is pierced by a central bore 25 which is provided with an internal thread with which a connection fitting for the pressure oil can be screwed.
  • the piston 15 On its side associated with the gas chamber 14, the piston 15 has a recess 27 in the piston head, in which the compressed gas pressure cushion of the gas chamber 14 is accommodated when the piston 15 is fully retracted, as shown in FIG. 1.
  • the piston 15 On the opposite side, which is assigned to the pressure oil, the piston 15 has a centrally arranged, circular-cylindrical damping piston 31 projecting from its main piston surface 29, which in the exemplary embodiment shown is formed in one piece with the remaining part of the piston 15 and is intended for interaction with a damping chamber 32 , which is formed as a central depression in the inside of the cylinder cover 23, aligned with the damping piston 31, and is connected to the central connection bore 25 for the pressure oil.
  • damping pistons 31 of conventional type which can be inserted into a damping chamber 32 in the case of end position damping
  • the outer diameter of the damping piston 31 and the inner diameter of the damping chamber 32 as well as the shape of the latter two components with bevels 33 on the damping piston 31 and bevels 35 and 36 on the inner wall of the damping chamber are in mutual adjustment chosen so that when the damping piston 31 is inserted into the damping space 32 between the mutually opposite walls, a damping gap 38 (FIG. 2) is formed, through which the piston 15 approaches its advanced (lower in the drawing) end position the pressure oil, which is displaced from the main piston surface 29 from the pressure chamber 40 adjacent to it (FIG. 2), can be supplied with throttling in the damping gap 38 to the pressure oil connection, that is to say to the connection bore 25.
  • the damping piston 31 is designed in the form of a sleeve, the interior 43 of which is arranged centrally and extends in the axial direction, is open at the front end 45 of the damping piston 31 and serves as a valve housing for a ring-plate check valve 47, the movable valve plate 48 of which Inner wall of the interior 43 is guided.
  • the interior 43 of the sleeve has an internal thread, into which the valve seat ring 49 of the check valve 47 is screwed, on the inside of which the valve plate 48 normally rests under the spring force of a valve spring, with which it is located in the present exemplary embodiment is a helical spring 51 which is supported on the one hand on the side of the valve plate 48 facing away from the valve seat ring 49 and on the other hand on the base 52 of the interior 43.
  • the wall of the sleeve forming the damping piston 31 is provided with an opening 55 which extends from the interior 43 to the outside and which opens on the outside in the region of the part of the pressure chamber 40 adjoining the main piston surface 29.
  • the opening 55 forms together with the interior 43 an inner flow path with an inlet opening defined by the ring bore 57 of the valve seat ring 49 and an outlet opening formed by the opening 55, this flow path being able to be blocked and released by the intermediate check valve 47.
  • Fig. 1 shows an operating state in which the pressure oil supplied from the connection bore 25 has the operating pressure at which the piston 15 is pushed back and the gas pressure cushion on the rear side of the piston in the gas space 14 is compressed within the recess 27 in the piston crown.
  • the piston 15 moves in the forward direction.
  • the valve plate 48 of the check valve 47 bears against the valve seat ring 49 because when the oil pressure drops at the connection bore 25 the internal oil pressure in the interior 43 of the sleeve containing the check valve (this pressure has adjusted to the prevailing operating pressure) predominates.
  • a considerable cross section can be provided for the internal flow path containing the check valve 47 and bypassing the damping gap 38 without constructional difficulties, in particular a large usable valve passage cross section results due to the large diameter of the valve plate 48 and the valve seat ring 49 whose dimensions can approximately correspond to the piston diameter. If necessary, you can increase the outlet cross-section of the outlet opening of the inner flow path, more than one opening 55 may be provided.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Damping Devices (AREA)
  • Actuator (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
EP88100290A 1987-04-14 1988-01-12 Unité piston-cylindre Withdrawn EP0286777A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873712671 DE3712671A1 (de) 1987-04-14 1987-04-14 Kolben-zylinder-einheit
DE3712671 1987-04-14

Publications (2)

Publication Number Publication Date
EP0286777A2 true EP0286777A2 (fr) 1988-10-19
EP0286777A3 EP0286777A3 (fr) 1989-12-06

Family

ID=6325614

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88100290A Withdrawn EP0286777A3 (fr) 1987-04-14 1988-01-12 Unité piston-cylindre

Country Status (3)

Country Link
EP (1) EP0286777A3 (fr)
JP (1) JPS63308202A (fr)
DE (1) DE3712671A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29721200U1 (de) * 1997-11-29 1998-01-22 Bümach Engineering International B.V., Emmen Dichtende Gewindepaarung
EP1074750A3 (fr) * 1999-08-04 2003-06-04 UNIVER S.p.A. Vérin à fluide avec amortissement et dispositif de réglage de vitesse
WO2007118500A1 (fr) * 2006-03-30 2007-10-25 Zf Friedrichshafen Ag Dispositif d'accumulation dE fluide hydraulique d'un système hydraulique d'un dispositif à engrenage
WO2022043063A1 (fr) * 2020-08-27 2022-03-03 Hydac Technology Gmbh Accumulateur à piston
EP4039986A1 (fr) * 2021-02-08 2022-08-10 Roth Hydraulics GmbH Accumulateur hydraulique
DE102022000098A1 (de) 2022-01-12 2023-07-13 Hydac Technology Gmbh Kolbenspeicher
DE102022000176A1 (de) 2022-01-18 2023-07-20 Hydac Technology Gmbh Kolbenspeicher

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4759282B2 (ja) * 2005-02-14 2011-08-31 中村工機株式会社 二段圧吸収式ピストン型アキュムレータ装置
DE102017204454A1 (de) 2017-03-16 2018-09-20 Robert Bosch Gmbh Speicherkolben, insbesondere für einen Druckmittelspeicher eines Hydraulikaggregats einer elektronisch schlupfregelbaren Fahrzeugbremsanlage
DE102021003255A1 (de) * 2021-06-24 2022-12-29 Hydac Technology Gmbh Hydrospeicher

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB755342A (en) * 1954-03-12 1956-08-22 Keelavite Co Ltd Improvements in or relating to free piston hydraulic accumulators
DE1039844B (de) * 1957-05-23 1958-09-25 Pumpenfabrik Urach Hydraulischer Arbeitszylinder mit Daempfungseinrichtung
DE1175995B (de) * 1960-07-12 1964-08-13 Teves Kg Alfred Hydraulische Daempfungseinrichtung fuer die Hubenden von Kolbenstangenzylindern
DE2027395A1 (de) * 1970-06-04 1971-12-09 Hennecke E Doppelt wirkender druckmittelbeaufschlagter Arbeitszylinder mit Endlagendämpfung
DE2240980A1 (de) * 1972-08-21 1974-03-07 Adam Dipl Ing Elmer Einrichtung zur daempfung des kolbenaufschlages in hydraulischen arbeitszylindern

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB755342A (en) * 1954-03-12 1956-08-22 Keelavite Co Ltd Improvements in or relating to free piston hydraulic accumulators
DE1039844B (de) * 1957-05-23 1958-09-25 Pumpenfabrik Urach Hydraulischer Arbeitszylinder mit Daempfungseinrichtung
DE1175995B (de) * 1960-07-12 1964-08-13 Teves Kg Alfred Hydraulische Daempfungseinrichtung fuer die Hubenden von Kolbenstangenzylindern
DE2027395A1 (de) * 1970-06-04 1971-12-09 Hennecke E Doppelt wirkender druckmittelbeaufschlagter Arbeitszylinder mit Endlagendämpfung
DE2240980A1 (de) * 1972-08-21 1974-03-07 Adam Dipl Ing Elmer Einrichtung zur daempfung des kolbenaufschlages in hydraulischen arbeitszylindern

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29721200U1 (de) * 1997-11-29 1998-01-22 Bümach Engineering International B.V., Emmen Dichtende Gewindepaarung
EP1074750A3 (fr) * 1999-08-04 2003-06-04 UNIVER S.p.A. Vérin à fluide avec amortissement et dispositif de réglage de vitesse
WO2007118500A1 (fr) * 2006-03-30 2007-10-25 Zf Friedrichshafen Ag Dispositif d'accumulation dE fluide hydraulique d'un système hydraulique d'un dispositif à engrenage
WO2022043063A1 (fr) * 2020-08-27 2022-03-03 Hydac Technology Gmbh Accumulateur à piston
EP4039986A1 (fr) * 2021-02-08 2022-08-10 Roth Hydraulics GmbH Accumulateur hydraulique
WO2022167341A1 (fr) * 2021-02-08 2022-08-11 Roth Hydraulics Gmbh Accumulateur hydraulique
DE102022000098A1 (de) 2022-01-12 2023-07-13 Hydac Technology Gmbh Kolbenspeicher
WO2023134978A1 (fr) 2022-01-12 2023-07-20 Hydac Technology Gmbh Accumulateur à piston
DE102022000176A1 (de) 2022-01-18 2023-07-20 Hydac Technology Gmbh Kolbenspeicher
WO2023138868A1 (fr) 2022-01-18 2023-07-27 Hydac Technology Gmbh Accumulateur à piston

Also Published As

Publication number Publication date
DE3712671A1 (de) 1988-10-27
EP0286777A3 (fr) 1989-12-06
JPS63308202A (ja) 1988-12-15

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