EP0538501A1 - Cylinder accumulator with charging oil disconnecting device in a hydraulic circuit - Google Patents

Cylinder accumulator with charging oil disconnecting device in a hydraulic circuit Download PDF

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Publication number
EP0538501A1
EP0538501A1 EP91117885A EP91117885A EP0538501A1 EP 0538501 A1 EP0538501 A1 EP 0538501A1 EP 91117885 A EP91117885 A EP 91117885A EP 91117885 A EP91117885 A EP 91117885A EP 0538501 A1 EP0538501 A1 EP 0538501A1
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EP
European Patent Office
Prior art keywords
cylinder
gas
valve
piston
pressure accumulator
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
EP91117885A
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German (de)
French (fr)
Other versions
EP0538501B1 (en
Inventor
Manfred Wege
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Bolenz & Schafer Maschinenfabrik GmbH
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Bolenz & Schafer Maschinenfabrik 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.)
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Publication date
Application filed by Bolenz & Schafer Maschinenfabrik GmbH filed Critical Bolenz & Schafer Maschinenfabrik GmbH
Priority to ES91117885T priority Critical patent/ES2069170T3/en
Priority to DE59104086T priority patent/DE59104086D1/en
Priority to AT91117885T priority patent/ATE116409T1/en
Priority to EP91117885A priority patent/EP0538501B1/en
Publication of EP0538501A1 publication Critical patent/EP0538501A1/en
Application granted granted Critical
Publication of EP0538501B1 publication Critical patent/EP0538501B1/en
Anticipated expiration legal-status Critical
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61D—BODY DETAILS OR KINDS OF RAILWAY VEHICLES
    • B61D7/00—Hopper cars
    • B61D7/14—Adaptations of hopper elements to railways
    • B61D7/16—Closure elements for discharge openings
    • B61D7/24—Opening or closing means
    • B61D7/28—Opening or closing means hydraulic or pneumatic
    • 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
    • F15B2201/41—Liquid ports
    • F15B2201/413—Liquid ports having multiple 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 cylinder pressure accumulator with a flying piston dividing the cylinder space into an oil space and a gas space in a hydraulic system, in particular on non-self-propelled vehicles for bulk goods with a hydraulically operated unloading device, with a pipeline leading into the oil space of the pressure accumulator
  • Check valve for the charging oil flow and an outgoing pipeline with a check valve for the working oil flow are connected and the gas space is equipped with a gas filling valve.
  • Cylinder pressure accumulators with these generic features are known in connection with hydraulic systems for actuating the unloading device on vehicles for bulk goods by prior use. Such devices are in use on railway wagons for bulk goods.
  • a wheelset pump is non-positively connected to a carriage axle, through which hydraulic oil is pumped into a cylinder pressure accumulator when the carriage moves.
  • a pressure shut-off valve is actuated, which redirects the charging oil flow to an oil reservoir without pressure.
  • the discharge device can be actuated without supplying any other energy, e.g. the side walls of the wagon or bulk goods flaps provided therein can be opened.
  • the pressure accumulator is recharged by the wheelset pump after the pressure shut-off valve is closed.
  • Such a device for generating energy for actuating the discharge device is in principle very advantageous over other devices for this purpose.
  • the pressure shut-off valve is only a valve that switches via the pressure in the charge oil flow. It works with a switch-off tolerance of 10%.
  • the filling level of the pressure accumulator can also fluctuate by 10%.
  • fluctuations in the level in the pressure accumulator that are dependent on the ambient temperature must be taken into account. The level is lower at a high ambient temperature than at a low ambient temperature.
  • the invention has for its object to perfect a cylinder pressure accumulator of the type defined in the introduction so that the shutdown tolerance is reduced to a negligibly small size. This should not only reduce the construction volume of the pressure accumulator, but also save the generation and maintenance of a previously required excess energy.
  • the cylinder pressure accumulator essentially consists of a cylinder 1 , which is sealed oil-tight or gas-tight at one end by a cylinder base 2 and at the other end by a cylinder cover 3 , and a flying piston that divides the cylinder space into an oil space 4 and a gas space 5 6 .
  • a connecting bore 7 for a in-leading pipe 8 with a non-return valve 9 for the charging oil flow and a connection bore 10 for a lead-out conduit 11 with a check valve 12 are provided in each case for the working-oil flow.
  • the cylinder cover 3 closing the gas space 5 is provided with a gas filling valve 13 .
  • To the gas chamber side cylinder cover 3 is an axially projecting into the gas space 5 shift rod 14 in a gastight manner in the axial direction against the action of a spring assembly 15 and movably supported by the piston 6, which carries a protruding from the gas seal plunger 16 at its cylinder cover side end.
  • a central part 3a of the cylinder cover 3 protruding from the cylinder 1 is drilled through by an oil passage 17a , 17b which crosses the cylinder axis and which is arranged by a switching valve 18 which is arranged in the cylinder axis and is in contact with the tappet 16 of the switching rod 14 and opens when it is pushed is lockable.
  • the input part 17a of the oil channel is connected by a pipe 19 bridging the pressure accumulator to the pipe 8 leading into the oil space 4 for the charging oil flow.
  • the plunger 16 fastened to the end of the shift rod 14 on the cylinder cover side has a cylindrical cam 16a in continuation of the shift rod 14 .
  • a prestressed helical spring 20, which is supported on an annular shoulder 16b of the plunger 16 and acts against the closing body 18a of the switching valve 18 is arranged thereon.
  • the housing of the switching valve 18 is closed by an oil-tight screw plug 22 screwed in from the outside in the central part 3a of the cylinder cover 3 .
  • the shift rod 14 is surrounded by a spacer tube 23 which limits the path of the piston 6 to the gas side, which is welded at one end to a spacer tube base 23a which has a central opening and is fastened to the inside of the cylinder cover 3 by means of screws 23b .
  • the switching rod 14 projects beyond the free edge of the spacer tube 23 on the piston side by a partial distance of the opening path of the switching valve 18 .
  • the shift rod 14 carries at its piston end an abutment 27 which is held by a nut 28 screwed onto the end of the shift rod 14 and which holds the plate springs 26 under prestress.
  • the nut 28 protrudes over the edge of the spacer tube 23 and serves as a switching stop for the switching rod 14 for the piston 6 on its way to the gas space during the charging process.
  • the spacer tube 23 thus limits on the one hand the path of the piston 6 to the gas side and on the other hand the path of the switching rod 14 to the switching valve 18 .
  • the opposite path of the shift rod 14 is limited by a shoulder-like thickening 14a of the shift rod 14 with which it abuts the inside of the intermediate floor 25 .
  • a hollow cylindrical projection 29 is fastened coaxially to the inside of the cylinder cover 3 by means of screws 24 , which on a part of the switching rod 14 when a space is left free their length surrounds.
  • the cavity of the extension 29 continues in a recess 30 of the same diameter in the cylinder cover 3 , which merges into a shoulder-like taper 31 in the interior of the cylinder cover 3 .
  • the gas seal between the shift rod 14 and the cylinder cover 3 which enables the shift rod 14 to move axially, consists of an axially elastic metal bellows 32 surrounding the shift rod 14 at a short distance. This is welded gas-tight at one end to the plunger 16 designed as a screw cap and screwed onto the end of the switching rod 14 and at its other end to the free edge of the hollow cylindrical projection 29 .
  • the input part 17a and the output part 17b of the oil channel 17a , 17b leading through the part 3a of the cylinder bottom 3 protruding from the cylinder 1 are offset in the direction of the cylinder axis in such a way that the input part 17a opens radially into the switching valve 18 behind the closing body 18a in the closing direction while the output part 17b of the cylinder cover 3 out leads in the closing direction before the closing body 18a forming radially from a portion of the oil passage 31 of the axial bore taper 30th
  • the operation of the cylinder pressure accumulator according to the invention is as follows:
  • the gas space 5 is filled with gas up to a predetermined pressure by the gas filler valve 13 .
  • the pressure of the charging oil flow is transferred through the bypass pipeline 19 into the input part 17a of the oil channel leading through the extension 3a of the cylinder cover 3 to the rear of the closing body 18a in the switching valve 18 .
  • the pressure of the charging oil flow together with the coil spring 21 located on the rear side of the closing body 18a, keeps the switching valve 18 closed against the action of the coil spring 20 located on the cam 16a of the plunger 16 at the end of the switching rod 14 .
  • the pipeline 11 coming from the oil space 4 for the working oil flow leads to the consumer (not shown in the drawing) in the form of a hydraulic system for actuating the unloading device. It is kept closed there until the unloading device is actuated.
  • the piston 6 When filling the oil space 4 , the piston 6 is pressed against the gas space 5 . At the end of the filling process, it bumps against the nut 28 on the shift rod 14 . This initiates the opening of the switching valve 18 with the cam 16a located at its other end. At the beginning of the valve opening, oil is discharged from the oil charging flow through the output part 17b of the oil channel containing the switching valve 18 . In the process, the pressure of the charging oil flow, which loads on the valve closing body 18a, is reduced. The helical spring 20 arranged on the cam 16a with pretension suddenly abruptly opens the switching valve 18 .
  • the original charging oil flow is now passed without pressure through the bypass line 19 and the oil channel 17a , 17b via the switching valve 18 past the pressure accumulator into an oil tank, not shown in the drawing.
  • Unloading device moves the piston 6 back.
  • the plate springs 26 push the switching rod 14 back into its loading position and the pressure of the coil spring 20 arranged on its cam 16a against the closing body 18a of the switching valve 18 is reduced.
  • the helical spring 21 arranged on the back of the closing body 18a and tensioned when the valve is open now closes the switching valve 18 again with the support of the pressure prevailing in the charging oil flow.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transportation (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
  • Vehicle Body Suspensions (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

The invention relates to a cylinder accumulator with a floating piston (6), subdividing the cylinder space into an oil space (4) and a gas space (5), in a hydraulic circuit. A control rod (14) projecting axially into the gas space (5) is arranged in an axially movable manner at the cylinder lid (3) on the gas-space side, which control rod (14) acts through the piston (6) on a control valve (18) arranged in the cylinder lid (3) on the gas-space side. Crossing a part (3a) of the cylinder lid (3) projecting from the cylinder lid (3) is an oil passage (17a, 17b), in which the control valve (18) is arranged in the area of the cylinder axis and the inlet side (17a) of which is connected by a bypass pipeline (19), bridging the accumulator, to the pipeline (8), leading into the oil space (4), for the charging-oil flow. A distance tube (23) coaxially surrounding the control rod (14) is arranged on the inside of the cylinder lid (3) on the gas-space side. The distance tube (23) accommodates a spring arrangement which is supported on an intermediate base (25) arranged in the distance tube (23) and acts via an abutment (27) against the piston (6) on the control rod (14). <IMAGE>

Description

Die Erfindung betrifft einen Zylinder-Druckspeicher mit einem den Zylinderraum in einen Ölraum und einen Gasraum unterteilenden fliegenden Kolben in einer Hydraulikanlage, insbesondere an nicht mit Eigenantrieb ausgestatteten Fahrzeugen für Schüttgüter mit einer hydraulisch betätigten Entladeeinrichtung, wobei an den Ölraum des Druckspeichers je eine hineinführende Rohrleitung mit Rückschlagventil für den Lade-Ölstrom und eine herausführende Rohrleitung mit Rückschlagventil für den Arbeits-Ölstrom angeschlossen sind und der Gasraum mit einem Gaseinfüllventil ausgestattet ist.The invention relates to a cylinder pressure accumulator with a flying piston dividing the cylinder space into an oil space and a gas space in a hydraulic system, in particular on non-self-propelled vehicles for bulk goods with a hydraulically operated unloading device, with a pipeline leading into the oil space of the pressure accumulator Check valve for the charging oil flow and an outgoing pipeline with a check valve for the working oil flow are connected and the gas space is equipped with a gas filling valve.

Zylinder-Druckspeicher mit diesen Gattungsmerkmalen sind in Verbindung mit Hydraulikanlagen zur Betätigung der Entladeeinrichtung an Fahrzeugen für Schüttgüter durch Vorbenutzung bekannt. An Eisenbahnwaggons für Schüttgüter sind derartige Einrichtungen im Gebrauch.Cylinder pressure accumulators with these generic features are known in connection with hydraulic systems for actuating the unloading device on vehicles for bulk goods by prior use. Such devices are in use on railway wagons for bulk goods.

Dabei ist mit einer Wagenachse eine Radsatzpumpe kraftschlüssig verbunden, durch die bei Fortbewegung des Waggons Hydrauliköl in einen Zylinder-Druckspeicher gepumpt wird. Bei Erreichung des eingestellten Betriebsdruckes im Druckspeicher wird ein Druck-Abschaltventil betätigt, welches den Lade-Ölstrom drucklos in einen Öl-Vorratsbehälter umleitet.A wheelset pump is non-positively connected to a carriage axle, through which hydraulic oil is pumped into a cylinder pressure accumulator when the carriage moves. When the set operating pressure in the pressure accumulator is reached, a pressure shut-off valve is actuated, which redirects the charging oil flow to an oil reservoir without pressure.

Mit Hilfe der im Gasraum des Druckspeichers gespeicherten, über den Kolben des Druckspeichers auf die hydraulische Einrichtung wirkenden Energie kann ohne Zuführung anderweitiger Energie die Entladeeinrichtung betätigt, z.B. können die Seitenwände des Waggons oder darin vorgesehene Schüttgüterklappen geöffnet werden. Beim Abtransport des geleerten Waggons wird nach dem Schließen des Druck-Abschaltventils der Druckspeicher durch die Radsatzpumpe wieder aufgeladen.With the aid of the energy stored in the gas space of the pressure accumulator and acting on the hydraulic device via the piston of the pressure accumulator, the discharge device can be actuated without supplying any other energy, e.g. the side walls of the wagon or bulk goods flaps provided therein can be opened. When the empty wagon is removed, the pressure accumulator is recharged by the wheelset pump after the pressure shut-off valve is closed.

Eine solche Einrichtung zur Gewinnung von Energie für die Betätigung der Entladeeinrichtung ist im Prinzip sehr vorteilhaft gegenüber anderen Einrichtungen für diesen Zweck. Sie ist jedoch wenigstens hinsichtlich der Abschaltung des Lade-Ölstromes bei Erreichen des eingestellten Betriebsdruckes im Druckspeicher noch verbesserungsbedürftig:
Das Druck-Abschaltventil ist ein ausschließlich über den im Lade-Ölstrom herrschenden Druck schaltendes Ventil. Es arbeitet mit einer Abschalttoleranz von 10 %. Das hat zur Folge, daß der Füllgrad des Druckspeichers ebenfalls um 10 % schwanken kann.
Darüber hinaus sind von der Umgebungstemperatur abhängige Schwankungen des Füllstandes im Druckspeicher zu berücksichtigen. Bei hoher Umgebungstemperatur ist der Füllstand geringer als bei niedriger Umgebungstemperatur.
Wegen dieser zum einen von der Abschalttoleranz des Druck-Abschaltventils und zum andern von der Umgebungstemperatur abhängigen Schwankungen des tatsächlichen Füllstandes im Druckspeicher ist eine beträchtlich größere Dimensionierung desselben erforderlich, um mit Sicherheit die für einen Entladevorgang benötigte Energie vorrätig zu haben.Such a device for generating energy for actuating the discharge device is in principle very advantageous over other devices for this purpose. However, it still needs to be improved at least with regard to switching off the charging oil flow when the set operating pressure in the pressure accumulator is reached:
The pressure shut-off valve is only a valve that switches via the pressure in the charge oil flow. It works with a switch-off tolerance of 10%. As a result, the filling level of the pressure accumulator can also fluctuate by 10%.
In addition, fluctuations in the level in the pressure accumulator that are dependent on the ambient temperature must be taken into account. The level is lower at a high ambient temperature than at a low ambient temperature.
Because of this on the one hand from the shutdown tolerance of the pressure shutoff valve and on the other hand from the Fluctuations in the actual fill level in the pressure accumulator, which are dependent on the ambient temperature, require a considerably larger dimensioning of the latter in order to surely have the energy required for a discharge process in stock.

Der Erfindung liegt die Aufgabe zugrunde, einen Zylinder-Druckspeicher der in der Beschreibungseinleitung definierten Gattung so zu vervollkommnen, daß die Abschalttoleranz auf eine vernachlässigbar geringe Größe reduziert wird. Damit soll nicht nur das Bauvolumen des Druckspeichers verringert, sondern auch die Erzeugung und Bereithaltung eines bisher erforderlichen Energieüberschusses eingespart werden.The invention has for its object to perfect a cylinder pressure accumulator of the type defined in the introduction so that the shutdown tolerance is reduced to a negligibly small size. This should not only reduce the construction volume of the pressure accumulator, but also save the generation and maintenance of a previously required excess energy.

Die gestellte Aufgabe wird erfindungsgemäß dadurch gelöst, daß ein solcher Druckspeicher mit den Merkmalen gemäß dem Kennzeichen des Anpsruchs 1 ausgestattet ist.
Weitere Merkmale des erfindungsgemäßen Druckspeichers gehen aus den Ansprüchen 2 bis 8 hervor.The object is achieved in that such a pressure accumulator is equipped with the features according to the characterizing part of claim 1.
Further features of the pressure accumulator according to the invention emerge from claims 2 to 8.

Im Folgenden wird die Erfindung anhand einer sie beispielsweise wiedergebenden Zeichnung näher erläutert. Es zeigen:

Fig. 1
Einen axialen Längsschnitt durch einen erfindungsgemäßen Zylinder-Druckspeicher,
Fig. 2
eine vergrößerte Darstellung des Ausschnittes A in Fig. 1.
The invention is explained in more detail below on the basis of a drawing which, for example, reproduces it. Show it:
Fig. 1
An axial longitudinal section through a cylinder pressure accumulator according to the invention,
Fig. 2
an enlarged view of section A in Fig. 1st

Der Zylinder-Druckspeicher besteht im wesentlichen aus einem Zylinder 1, der an seinem einen Ende durch einen Zylinderboden 2 und am anderen Ende durch einen Zylinderdeckel 3 öldicht bzw. gasdicht verschlossen ist und einem den Zylinderraum in einen Ölraum 4 und einen Gasraum 5 unterteilenden fliegenden Kolben 6.The cylinder pressure accumulator essentially consists of a cylinder 1 , which is sealed oil-tight or gas-tight at one end by a cylinder base 2 and at the other end by a cylinder cover 3 , and a flying piston that divides the cylinder space into an oil space 4 and a gas space 5 6 .

In dem den Ölraum 4 verschließenden Zylinderboden 2 sind je eine Anschlußbohrung 7 für eine hineinführende Rohrleitung 8 mit einem Rückschlagventil 9 für den Lade-Ölstrom und eine Anschlußbohrung 10 für eine herausführende Rohrleitung 11 mit Rückschlagventil 12 für den Arbeits-Ölstrom vorgesehen. Der den Gasraum 5 verschließende Zylinderdeckel 3 ist mit einem Gas-Einfüllventil 13 versehen.
An dem gasraumseitigen Zylinderdeckel 3 ist eine axial in den Gasraum 5 hineinragende Schaltstange 14 in axialer Richtung gegen die Wirkung einer Federanordnung 15 gasdicht und durch den Kolben 6 bewegbar gelagert, die an ihrem zylinderdeckelseitigen Ende einen aus der Gasabdichtung herausragenden Stößel 16 trägt.
Ein aus dem Zylinder 1 herausragender zentraler Teil 3a des Zylinderdeckels 3 ist von einem die Zylinderachse querenden Ölkanal 17a, 17b durchbohrt, der durch ein in der Zylinderachse angeordnetes, mit dem Stößel 16 der Schaltstange 14 in Kontakt stehendes und bei dessen Anstoß sich öffnendes Schaltventil 18 verschließbar ist. Der Eingangsteil 17a des Ölkanals ist durch eine den Druckspeicher überbrückende Rohrleitung 19 mit der in den Ölraum 4 führenden Rohrleitung 8 für den Lade-Ölstrom verbunden.In the oil chamber 4 closing cylinder base 2, a connecting bore 7 for a in-leading pipe 8 with a non-return valve 9 for the charging oil flow and a connection bore 10 for a lead-out conduit 11 with a check valve 12 are provided in each case for the working-oil flow. The cylinder cover 3 closing the gas space 5 is provided with a gas filling valve 13 .
To the gas chamber side cylinder cover 3 is an axially projecting into the gas space 5 shift rod 14 in a gastight manner in the axial direction against the action of a spring assembly 15 and movably supported by the piston 6, which carries a protruding from the gas seal plunger 16 at its cylinder cover side end.
A central part 3a of the cylinder cover 3 protruding from the cylinder 1 is drilled through by an oil passage 17a , 17b which crosses the cylinder axis and which is arranged by a switching valve 18 which is arranged in the cylinder axis and is in contact with the tappet 16 of the switching rod 14 and opens when it is pushed is lockable. The input part 17a of the oil channel is connected by a pipe 19 bridging the pressure accumulator to the pipe 8 leading into the oil space 4 for the charging oil flow.

Der am zylinderdeckelseitigen Ende der Schaltstange 14 befestigte Stößel 16 hat in Fortsetzung der Schaltstange 14 einen zylindrischen Nocken 16a. Darauf ist eine sich auf einer Ringschulter 16b des Stößels 16 abstützende, gegen den Schließkörper 18a des Schaltventils 18 wirkende, vorgespannte Schraubenfeder 20 angeordnet. An der Rückseite des Schließkörpers 18a im Schaltventil 18 ist eine sich am Ventilgehäuse abstützende und in Schließrichtung gegen den Schließkörper 18a des Schaltventils 18 wirkende Schraubenfeder 21 angeordnet, die schwächer ist, als die auf dem Nocken 16a des Stößels 16 angeordnete Schraubenfeder 20. Das Gehäuse des Schaltventils 18 ist durch einen axial von außen in den zentralen Teil 3a des Zylinderdeckels 3 öldicht eingeschraubten Schraubstopfen 22 zugänglich verschlossen.The plunger 16 fastened to the end of the shift rod 14 on the cylinder cover side has a cylindrical cam 16a in continuation of the shift rod 14 . A prestressed helical spring 20, which is supported on an annular shoulder 16b of the plunger 16 and acts against the closing body 18a of the switching valve 18 , is arranged thereon. On the rear side of the closing body 18a in the switching valve 18 there is a helical spring 21 which is supported on the valve housing and acts in the closing direction against the closing body 18a of the switching valve 18 and which is weaker than that on the coil spring 20 arranged on the cam 16a of the tappet 16 . The housing of the switching valve 18 is closed by an oil-tight screw plug 22 screwed in from the outside in the central part 3a of the cylinder cover 3 .

Die Schaltstange 14 ist von einem den Weg des Kolbens 6 zur Gasseite hin begrenzenden Distanzrohr 23 umgeben, welches an einem Ende mit einem eine zentrale Öffnung aufweisenden Distanzrohrboden 23a verschweißt und mit diesem mittels Schrauben 23b an der Innenseite des Zylinderdeckels 3 befestigt ist. Die Schaltstange 14 überragt den kolbenseitigen freien Rand des Distanzrohres 23 um eine Teilstrecke des Öffnungsweges des Schaltventils 18.
In dem Distanzrohr 23 befindet sich ein Zwischenboden 25, an dem sich die Federanordnung 15 in Form eines Paketes von Tellerfedern 26 abstützt. Die Schaltstange 14 trägt an ihrem kolbenseitigen Ende ein Widerlager 27, welches durch eine auf das Ende der Schaltstange 14 geschraubte Mutter 28 gehalten wird und die Tellerfedern 26 unter Vorspannung hält. Die Mutter 28 ragt über den Rand des Distanzrohres 23 hervor und dient dabei als Schaltanschlag der Schaltstange 14 für den Kolben 6 auf seinem Weg zum Gasraum hin beim Ladevorgang. Das Distanzrohr 23 begrenzt somit einerseits den Weg des Kolbens 6 zur Gasseite hin und andererseits den Weg der Schaltstange 14 zum Schaltventil 18 hin. Der gegenläufige Weg der Schaltstange 14 wird begrenzt durch eine absatzartige Verdickung 14a der Schaltstange 14, mit der sie an der Innenseite des Zwischenbodens 25 anstößt.
In der zentralen Öffnung des Distanzrohrbodens 23a ist koaxial ein hohlzylinderförmiger Ansatz 29 mittels Schrauben 24 an der Innenseite des Zylinderdeckels 3 befestigt, der die Schaltstange 14 bei Freilassung eines Zwischenraums auf einem Teil ihrer Länge umgibt. Der Hohlraum des Ansatzes 29 setzt sich in einer Ausdrehung 30 gleichen Durchmessers im Zylinderdeckel 3 fort, die im Innern des Zylinderdeckels 3 in eine absatzartige Verjüngung 31 übergeht.The shift rod 14 is surrounded by a spacer tube 23 which limits the path of the piston 6 to the gas side, which is welded at one end to a spacer tube base 23a which has a central opening and is fastened to the inside of the cylinder cover 3 by means of screws 23b . The switching rod 14 projects beyond the free edge of the spacer tube 23 on the piston side by a partial distance of the opening path of the switching valve 18 .
In the spacer tube 23 there is an intermediate floor 25 , on which the spring arrangement 15 is supported in the form of a package of disc springs 26 . The shift rod 14 carries at its piston end an abutment 27 which is held by a nut 28 screwed onto the end of the shift rod 14 and which holds the plate springs 26 under prestress. The nut 28 protrudes over the edge of the spacer tube 23 and serves as a switching stop for the switching rod 14 for the piston 6 on its way to the gas space during the charging process. The spacer tube 23 thus limits on the one hand the path of the piston 6 to the gas side and on the other hand the path of the switching rod 14 to the switching valve 18 . The opposite path of the shift rod 14 is limited by a shoulder-like thickening 14a of the shift rod 14 with which it abuts the inside of the intermediate floor 25 .
In the central opening of the spacer tube base 23a , a hollow cylindrical projection 29 is fastened coaxially to the inside of the cylinder cover 3 by means of screws 24 , which on a part of the switching rod 14 when a space is left free their length surrounds. The cavity of the extension 29 continues in a recess 30 of the same diameter in the cylinder cover 3 , which merges into a shoulder-like taper 31 in the interior of the cylinder cover 3 .

Die eine axiale Beweglichkeit der Schaltstange 14 ermöglichende Gasdichtung zwischen der Schaltstange 14 und dem Zylinderdeckel 3 besteht aus einem die Schaltstange 14 in geringem Abstand umgebenden, axial elastischen Metallbalg 32. Dieser ist mit seinem einen Ende an dem als Schraubkappe ausgebildeten und auf das Ende der Schaltstange 14 geschraubten Stößel 16 und mit seinem anderen Ende an dem freien Rand des hohlzylinderförmigen Ansatzes 29 gasdicht angeschweißt.The gas seal between the shift rod 14 and the cylinder cover 3 , which enables the shift rod 14 to move axially, consists of an axially elastic metal bellows 32 surrounding the shift rod 14 at a short distance. This is welded gas-tight at one end to the plunger 16 designed as a screw cap and screwed onto the end of the switching rod 14 and at its other end to the free edge of the hollow cylindrical projection 29 .

Der Eingangsteil 17a und der Ausgangsteil 17b des durch den aus dem Zylinder 1 herausragenden Teil 3a des Zylinderbodens 3 führenden Ölkanals 17a, 17b sind in Richtung der Zylinderachse derart gegeneinander versetzt, daß der Eingangsteil 17a in Schließrichtung hinter dem Schließkörper 18a radial in das Schaltventil 18 mündet, während der Ausgangsteil 17b in Schließrichtung vor dem Schließkörper 18a radial aus der einen Abschnitt des Ölkanals bildenden Verjüngung 31 der axialen Bohrung 30 des Zylinderdeckels 3 herausführt.The input part 17a and the output part 17b of the oil channel 17a , 17b leading through the part 3a of the cylinder bottom 3 protruding from the cylinder 1 are offset in the direction of the cylinder axis in such a way that the input part 17a opens radially into the switching valve 18 behind the closing body 18a in the closing direction while the output part 17b of the cylinder cover 3 out leads in the closing direction before the closing body 18a forming radially from a portion of the oil passage 31 of the axial bore taper 30th

Die Wirkungsweise des erfindungsgemäßen Zylinder-Druckspeichers ist folgendermaßen:
Der Gasraum 5 wird durch das Gas-Einfüllventil 13 mit Gas bis zu einem vorbestimmten Druck gefüllt. Zum Aufladen des Druckspeichers, das heißt zur Kompression des im Gasraum 5 befindlichen Gases wird durch die in den Ölraum 4 führende Rohrleitung 8 für den Lade-Ölstrom Öl in den Ölraum 4 gepumpt. Dies geschieht bei der Verwendung des Druckspeichers in einer Hydraulikanlage an einem nicht mit eigenem Antrieb ausgestatteten Fahrzeug für Schüttgüter mit einer hydraulisch betätigbaren Entladeeinrichtung durch eine Radsatzpumpe, die während der Fortbewegung des Fahrzeuges ständig pumpt.
Dabei wird der Druck des Lade-Ölstromes durch die Umgehungsrohrleitung 19 in den Eingangsteil 17a des durch den Ansatz 3a des Zylinderdeckels 3 führenden Ölkanals auf die Rückseite des Schließkörpers 18a im Schaltventil 18 übertragen. Der Druck des Lade-Ölstromes hält gemeinsam mit der auf der Rückseite des Schließkörpers 18a befindlichen Schraubenfeder 21 das Schaltventil 18 gegen die Wirkung des auf dem Nocken 16a des Stößels 16 am Ende der Schaltstange 14 befindlichen Schraubenfeder 20 geschlossen.
Die aus dem Ölraum 4 kommende Rohrleitung 11 für den Arbeits-Ölstrom führt zum in der Zeichnung nicht dargestellten Verbraucher in Form einer Hydraulikanlage zur Betätigung der Entladeeinrichtung. Sie wird dort jeweils bis zur Betätigung der Entladeeinrichtung geschlossen gehalten. Beim Füllen des Ölraumes 4 wird der Kolben 6 gegen den Gasraum 5 gedrückt. Er stößt am Ende des Füllvorganges gegen die Mutter 28 an der Schaltstange 14. Diese leitet mit dem an ihrem anderen Ende befindlichen Nocken 16a das Öffnen des Schaltventils 18 ein. Mit Beginn der Ventilöffnung wird Öl aus dem Öl-Ladestrom durch den Ausgangsteil 17b des das Schaltventil 18 enthaltenden Ölkanals abgeleitet. Dabei wird der auf dem Ventil-Schließkörper 18a lastende Druck des Lade-Ölstromes abgebaut. Die auf dem Nocken 16a mit Vorspannung angeordnete Schraubenfeder 20 stößt das Schaltventil 18 schlagartig ganz auf. Der ursprüngliche Lade-Ölstrom wird nun drucklos durch die Umgehungsleitung 19 und den Ölkanal 17a, 17b über das Schaltventil 18 an dem Druckspeicher vorbei in einen in der Zeichnung nicht dargestellten Ölbehälter umgeleitet.
Bei Öffnung der aus dem Ölraum zum Verbraucher führenden Rohrleitung 11 zur Betätigung der Entladeeinrichtung bewegt sich der Kolben 6 wieder zurück. Die Tellerfedern 26 drücken die Schaltstange 14 in ihre Lade-Position zurück und der Druck der auf ihrem Nocken 16a angeordneten Schraubenfeder 20 gegen den Schließkörper 18a des Schaltventils 18 verringert sich. Die auf der Rückseite des Schließkörpers 18a angeordnete, bei geöffnetem Ventil gespannte Schraubenfeder 21 schließt nun mit Unterstützung des in dem Lade-Ölstrom herrschenden Druckes wieder das Schaltventil 18. Nach Schließung der Rohrleitung 11 für den Arbeits-Ölstrom beginnt ein neuer Ladevorgang.The operation of the cylinder pressure accumulator according to the invention is as follows:
The gas space 5 is filled with gas up to a predetermined pressure by the gas filler valve 13 . To charge the pressure accumulator, that is to say to compress the gas in the gas space 5, oil is pumped into the oil space 4 through the pipeline 8 leading into the oil space 4 for the charging oil flow. This occurs when the pressure accumulator is used in a hydraulic system on a vehicle for bulk goods with a hydraulic system that is not equipped with its own drive actuated unloading device by a wheelset pump that pumps continuously while the vehicle is moving.
The pressure of the charging oil flow is transferred through the bypass pipeline 19 into the input part 17a of the oil channel leading through the extension 3a of the cylinder cover 3 to the rear of the closing body 18a in the switching valve 18 . The pressure of the charging oil flow, together with the coil spring 21 located on the rear side of the closing body 18a, keeps the switching valve 18 closed against the action of the coil spring 20 located on the cam 16a of the plunger 16 at the end of the switching rod 14 .
The pipeline 11 coming from the oil space 4 for the working oil flow leads to the consumer (not shown in the drawing) in the form of a hydraulic system for actuating the unloading device. It is kept closed there until the unloading device is actuated. When filling the oil space 4 , the piston 6 is pressed against the gas space 5 . At the end of the filling process, it bumps against the nut 28 on the shift rod 14 . This initiates the opening of the switching valve 18 with the cam 16a located at its other end. At the beginning of the valve opening, oil is discharged from the oil charging flow through the output part 17b of the oil channel containing the switching valve 18 . In the process, the pressure of the charging oil flow, which loads on the valve closing body 18a, is reduced. The helical spring 20 arranged on the cam 16a with pretension suddenly abruptly opens the switching valve 18 . The original charging oil flow is now passed without pressure through the bypass line 19 and the oil channel 17a , 17b via the switching valve 18 past the pressure accumulator into an oil tank, not shown in the drawing.
When opening the pipeline 11 leading from the oil space to the consumer for actuating the Unloading device moves the piston 6 back. The plate springs 26 push the switching rod 14 back into its loading position and the pressure of the coil spring 20 arranged on its cam 16a against the closing body 18a of the switching valve 18 is reduced. The helical spring 21 arranged on the back of the closing body 18a and tensioned when the valve is open now closes the switching valve 18 again with the support of the pressure prevailing in the charging oil flow. After the pipeline 11 for the working oil flow has been closed, a new charging process begins.

Claims (8)

Zylinder-Druckspeicher mit einem an beiden Seiten verschlossenen rohrförmigen Zylinder (1) und einem den Zylinderraum in einen Ölraum (4) und einen Gasraum (5) unterteilenden fliegenden Kolben (6) in einer Hydraulikanlage, insbesondere an nicht mit eigenem Antrieb ausgestatteten Fahrzeugen für Schüttgüter mit einer hydraulisch betätigbaren Entladeeinrichtung, wobei an den Ölraum (4) je eine hineinführende Rohrleitung (8) mit Rückschlagventil (9) für den Lade-Ölstrom und eine herausführende Rohrleitung (11) mit Rückschlagventil (12) für den Arbeits-Ölstrom angeschlossen sind und der Gasraum (5) des Druckspeichers mit einem Gas-Einfüllventil (13) ausgestattet ist.,
dadurch gekennzeichnet, a) daß an dem gasraumseitigen Zylinderdeckel (3) eine axial in den Gasraum (5) hineinragende Schaltstange (14) in Achsrichtung gegen die Wirkung einer Federanordnung (15) durch den Kolben (6) bewegbar gasdicht gelagert ist, die an ihrem zylinderdeckelseitigen Ende in einem aus der Gasdichtung herausragenden Stößel (16) endet; b) daß ein aus dem Zylinder (1) herausragender zentraler Teil (3a) des Zylinderdeckels (3) von einem die Zylinderachse querenden Ölkanal (17 a, 17b) durchbohrt ist, der durch ein in der Zylinderachse angeordnetes, mit dem Stößel (16) der Schaltstange ( 14) in Kontakt stehendes und bei dessen Anstoß sich öffnendes Schaltventil (18) verschließbar ist und dessen Eingangsseite (17a) durch eine den Druckspeicher überbrückende Umgehungs-Rohrleitung (19) mit der in den Ölraum (4) führenden Rohrleitung (8) für den Lade-Ölstrom verbunden ist; c) daß die Schaltstange (14) koaxial von einem den Weg des Kolbens (6) zur Gasseite hin begrenzenden Distanzrohr (23) umgeben ist, welches mit einem Ende an der Innenseite des Zylinderdeckels (3) befestigt ist, wobei die Schaltstange (14) den kolbenseitigen freien Rand des Distanzrohres (23) um eine Teilstrecke des Öffnungsweges des Schaltventils (18) überragt; d) daß in einiger Entfernung vom kolbenseitigen Ende des Distanzrohres (23) ein Zwischenboden (25) angeordnet ist und die Schaltstange (14) an ihrem kolbenseitigen Ende ein mit ihr bewegliches Widerlager (27) trägt, wobei zwischen diesem und dem Zwischenboden (25) eine über das Widerlager (27) auf die Schaltstange (14) wirkende und sich dabei an dem Zwischenboden (25) abstützende vorgespannte Federanordnung (15) vorgesehen ist. Cylinder pressure accumulator with a tubular cylinder ( 1 ) closed on both sides and a flying piston ( 6 ) dividing the cylinder space into an oil space ( 4 ) and a gas space ( 5 ) in a hydraulic system, in particular on vehicles for bulk goods not equipped with their own drive with a hydraulically actuated unloading device, each with an incoming pipe ( 8 ) with a check valve ( 9 ) for the charging oil flow and an outgoing pipe ( 11 ) with a check valve ( 12 ) for the working oil flow are connected to the oil chamber ( 4 ) and the gas space ( 5 ) of the pressure accumulator is equipped with a gas filler valve ( 13 ),
characterized, a) that on the gas chamber side cylinder cover ( 3 ) an axially in the gas chamber ( 5 ) protruding shift rod ( 14 ) in the axial direction against the action of a spring arrangement ( 15 ) by the piston ( 6 ) is movably mounted gas-tight, which at its cylinder cover end in a plunger ( 16 ) protruding from the gas seal ends; b) that an outstanding from the cylinder (1) a central part (3a) of the cylinder cover (3) crossing of a the cylinder axis oil passage (17 a, is pierced 17b) defined by a valve disposed in the cylinder axis, with the tappet (16) the Switching rod ( 14 ) which is in contact and opens when the switching valve ( 18 ) opens and whose input side ( 17a ) is by a bypass pipe ( 19 ) bridging the pressure accumulator with the pipe ( 8 ) leading into the oil chamber ( 4 ) for the charging oil flow is connected; c) that the switching rod ( 14 ) is coaxially surrounded by a distance tube ( 23 ) which limits the path of the piston ( 6 ) to the gas side and which is attached at one end to the inside of the cylinder cover ( 3 ), the switching rod ( 14 ) projects over the piston-side free edge of the spacer tube ( 23 ) by a partial distance of the opening travel of the switching valve ( 18 ); d) that an intermediate floor ( 25 ) is arranged at a distance from the piston-side end of the spacer tube ( 23 ) and the switching rod ( 14 ) carries an abutment ( 27 ) which can be moved with it at its piston-side end, between this and the intermediate floor ( 25 ) A prestressed spring arrangement ( 15 ) is provided which acts on the shift rod ( 14 ) via the abutment ( 27 ) and is supported on the intermediate floor ( 25 ). Zylinder-Druckspeicher nach Anspruch 1,
dadurch gekennzeichnet,
daß auf einem axialen zylindrischen Nocken ( 16b) des Stößels (16) am gasraumseitigen Ende der Schaltstange (14) eine sich auf einer Ringschulter (16b) des Stößels (16) abstützende, gegen den Schließkörper (18a) des Schließventils (18) wirkende vorgespannte Schraubenfeder (20) angeordnet ist, wobei auf der Rückseite am Ventil-Schließkörper (18a) eine sich am Ventilgehäuse abstützende und in Schließrichtung gegen den Ventil-Schließkörper (18a) wirkende Schrauben-Feder (21) angeordnet ist, die schwächer ist, als die auf dem Nocken (16a) des Stößels (16) angeordnete SchraubenFeder (20).Cylinder pressure accumulator according to claim 1,
characterized,
that the gas chamber end of the switching rod (14) which is supported on an annular shoulder (16b) of the plunger (16) acting against the closing body (18a) of the closing valve (18) biased on an axial cylindrical cam (16b) of the plunger (16) Coil spring ( 20 ) is arranged, wherein on the back of the valve closing body ( 18a ) is supported on the valve housing and in the closing direction against the valve closing body ( 18a ) acting helical spring ( 21 ) is arranged, which is weaker than the helical spring ( 20 ) arranged on the cam ( 16a ) of the tappet ( 16 ). Zylinder-Druckspeicher nach einem der Ansprüche 1 oder 2,
dadurch gekennzeichnet,
daß das Distanzrohr (23) an seinem zylinderdeckelseitigen Ende einen an der Innenseite des Zylinderdeckels (3) befestigten Distanzrohrboden (23a) hat, der koaxial einen in das Distanzrohr (23) hineinragenden, die Schaltstange (14) bei Freilassung eines Zwischenraumes (30) umgebenden hohlzylinderförmigen Ansatz (29) aufweist, wobei sich der Hohlraum des Ansatzes (29) in einer Ausdrehung gleichen Durchmessers im Zylinderdeckel (3) fortsetzt, die im Innern des Zylinderdeckels (3) absatzartig in eine Verjüngung (31) übergeht.Cylinder pressure accumulator according to one of claims 1 or 2,
characterized,
that the spacer tube ( 23 ) has at its end on the cylinder cover side a spacer tube base ( 23a ) attached to the inside of the cylinder cover ( 3 ), which coaxially projects into the spacer tube ( 23 ) and surrounds the shift rod ( 14 ) when a space ( 30 ) is left free having a hollow cylindrical extension (29), wherein the cavity of the projection (29) continues in a recess of the same diameter in the cylinder cover (3), which merges batch manner in a taper (31) in the interior of the cylinder cover (3). Zylinder-Druckspeicher nach einem der Ansprüche 1 bis 3,
dadurch gekennzeichnet,
daß die eine axiale Bewegung der Schaltstange (14) ermöglichende Gasdichtung zwischen der Schaltstange (14) und dem Zylinderdeckel (3) aus einem die Schaltstange (14) in geringem Abstand umgebenden, axial elastischen Metallbalg (32) besteht, der mit seinem einen Ende an dem als Schraubkappe ausgebildeten Stößel (16) der Schaltstange (14) und mit seinem anderen Ende an dem kolbenseitigen Rand des in der zentralen Öffnung des Distanzrohrbodens (23a) angeordneten hohlzylinderförmigen Ansatzes (29) jeweils gasdicht befestigt ist, wobei der Ansatz (29) seinerseits mittels Schrauben (24) an der Innenseite des Zylinderdeckels (3) durch Zwischenanordnung eines in eine Ringnut eingelegten Dichtungs-O-Ringes (33) gasdicht befestigt ist.Cylinder pressure accumulator according to one of claims 1 to 3,
characterized,
that the axial movement of the shift rod ( 14 ) enables gas seal between the shift rod ( 14 ) and the cylinder cover ( 3 ) from an axially elastic metal bellows ( 32 ) surrounding the shift rod ( 14 ) at a short distance, which has one end at the pusher (16) designed as a screw cap of the switching rod (14) and is fastened with its other end to the piston-side edge of which is arranged in the central opening of the spacer pipe bottom (23a) of the hollow-cylindrical projection (29) each have a gas-tight, wherein the projection (29) in turn by means of screws ( 24 ) on the The inside of the cylinder cover ( 3 ) is attached in a gas-tight manner by interposing a sealing O-ring ( 33 ) inserted in an annular groove. Zylinder-Druckspeicher nach einem der Ansprüche 1 bis 4,
dadurch gekennzeichnet,
daß die im freien Endabschnitt des Distanzrohres (23) vorgesehene Federanordnung (15) aus einem Paket von Tellerfedern (26) besteht, welches durch eine auf das Widerlager (27) wirkende, auf ein Gewinde am kolbenseitigen Ende der Schaltstange (14) geschraubte Mutter (28) vorgespannt ist, wobei die Mutter (28) soweit über den Rand des Distanzrohres (23) hervorragt, wie sich das Schaltventil (18) in dem Ölkanal (17a, 17b) des Zylinderdeckels (3) öffnen soll und als Schaltanschlag für den Kolben (6) auf seinem Weg zum Gasraum hin beim Ladevorgang dient.Cylinder pressure accumulator according to one of claims 1 to 4,
characterized,
that the spring arrangement ( 15 ) provided in the free end section of the spacer tube ( 23 ) consists of a set of disc springs ( 26 ) which is screwed by a nut () acting on the abutment ( 27 ) onto a thread on the piston-side end of the selector rod ( 14 ) 28 ) is biased, the nut ( 28 ) projecting beyond the edge of the spacer tube ( 23 ) as the switching valve ( 18 ) in the oil channel ( 17a , 17b ) of the cylinder cover ( 3 ) should open and as a switching stop for the piston ( 6 ) serves on its way to the gas space during the charging process. Zylinder-Druckspeicher nach einem der Ansprüche 1 bis 5,
dadurch gekennzeichnet,
daß das Distanzrohr (23) mittels den Distanzrohrboden (23a) durchdringender Schrauben (23b) an der Innenseite des Zylinderdeckels (3) befestigt ist.Cylinder pressure accumulator according to one of claims 1 to 5,
characterized,
that the spacer tube ( 23 ) is fastened to the inside of the cylinder cover ( 3 ) by means of screws ( 23b ) penetrating the spacer tube base ( 23a ). Zylinder-Druckspeicher nach einem der Ansprüche 1 bis 6,
dadurch gekennzeichnet,
daß das Gehäuse des Schaltventils (18) durch einen axial von außen in den Zylinderdeckel (3) öldicht eingeschraubten Schraubstopfen (22) zugänglich verschlossen ist.Cylinder pressure accumulator according to one of claims 1 to 6,
characterized,
that the housing of the switching valve ( 18 ) is accessible by a screw plug ( 22 ) screwed in oil-tight from the outside into the cylinder cover ( 3 ). Zylinder-Druckspeicher nach einem der Ansprüche 1 bis 7,
dadurch gekennzeichnet,
daß an der dem Ventilsitz (18c) des Schaltventils (18) zugekehrten Seite des Ventil-Schließkörpers (18a) eine ringförmige Dichtung (18d) aus elastischen Kunststoff oder dergleichen Material angeordnet ist.Cylinder pressure accumulator according to one of claims 1 to 7,
characterized,
that an annular seal ( 18d ) made of elastic plastic or similar material is arranged on the side of the valve closing body ( 18a ) facing the valve seat ( 18c ) of the switching valve ( 18 ).
EP91117885A 1991-10-19 1991-10-19 Cylinder accumulator with charging oil disconnecting device in a hydraulic circuit Expired - Lifetime EP0538501B1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
ES91117885T ES2069170T3 (en) 1991-10-19 1991-10-19 CYLINDER TYPE PRESSURE ACCUMULATOR WITH DEVICE FOR DISCONNECTING THE LOAD OIL CURRENT IN A HYDRAULIC SYSTEM.
DE59104086T DE59104086D1 (en) 1991-10-19 1991-10-19 Cylinder pressure accumulator with charge oil flow switch-off device in a hydraulic system.
AT91117885T ATE116409T1 (en) 1991-10-19 1991-10-19 CYLINDER PRESSURE ACCUMULATOR WITH CHARGING OIL CURRENT SHUT-OFF DEVICE IN A HYDRAULIC SYSTEM.
EP91117885A EP0538501B1 (en) 1991-10-19 1991-10-19 Cylinder accumulator with charging oil disconnecting device in a hydraulic circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP91117885A EP0538501B1 (en) 1991-10-19 1991-10-19 Cylinder accumulator with charging oil disconnecting device in a hydraulic circuit

Publications (2)

Publication Number Publication Date
EP0538501A1 true EP0538501A1 (en) 1993-04-28
EP0538501B1 EP0538501B1 (en) 1994-12-28

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ID=8207269

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91117885A Expired - Lifetime EP0538501B1 (en) 1991-10-19 1991-10-19 Cylinder accumulator with charging oil disconnecting device in a hydraulic circuit

Country Status (4)

Country Link
EP (1) EP0538501B1 (en)
AT (1) ATE116409T1 (en)
DE (1) DE59104086D1 (en)
ES (1) ES2069170T3 (en)

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CN109058183A (en) * 2018-10-16 2018-12-21 安徽博流体传动股份有限公司 A kind of gas-liquid mixed accumulator
CN112728156A (en) * 2020-12-31 2021-04-30 湖南鸿辉科技有限公司 Reversing valve with speed sectional control function and application device
CN112728156B (en) * 2020-12-31 2024-06-11 湖南鸿辉科技有限公司 Reversing valve with speed sectional control and application device

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DE873933C (en) * 1945-08-08 1953-04-20 & Giesserei Netstal A G Maschf Pressure medium accumulation system with charging pump, especially for the individual drive of hydraulically operated machines, e.g. B. hydraulic presses
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Cited By (4)

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Publication number Priority date Publication date Assignee Title
CN109058183A (en) * 2018-10-16 2018-12-21 安徽博流体传动股份有限公司 A kind of gas-liquid mixed accumulator
CN109058183B (en) * 2018-10-16 2024-05-03 安徽博一流体传动股份有限公司 Gas-liquid mixing accumulator
CN112728156A (en) * 2020-12-31 2021-04-30 湖南鸿辉科技有限公司 Reversing valve with speed sectional control function and application device
CN112728156B (en) * 2020-12-31 2024-06-11 湖南鸿辉科技有限公司 Reversing valve with speed sectional control and application device

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EP0538501B1 (en) 1994-12-28
ES2069170T3 (en) 1995-05-01
ATE116409T1 (en) 1995-01-15
DE59104086D1 (en) 1995-02-09

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