EP1086312A1 - Piston-type accumulator for a hydraulic fluid to be supplied to a consumer in a hydraulic installation - Google Patents

Piston-type accumulator for a hydraulic fluid to be supplied to a consumer in a hydraulic installation

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Publication number
EP1086312A1
EP1086312A1 EP99927842A EP99927842A EP1086312A1 EP 1086312 A1 EP1086312 A1 EP 1086312A1 EP 99927842 A EP99927842 A EP 99927842A EP 99927842 A EP99927842 A EP 99927842A EP 1086312 A1 EP1086312 A1 EP 1086312A1
Authority
EP
European Patent Office
Prior art keywords
piston
cylinder
switching
cylinder cover
plunger
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
EP99927842A
Other languages
German (de)
French (fr)
Other versions
EP1086312B1 (en
Inventor
Josef Scholl
Herbert Baltes
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.)
Hydac Technology GmbH
Original Assignee
Hydac Technology GmbH
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Filing date
Publication date
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Application filed by Hydac Technology GmbH filed Critical Hydac Technology GmbH
Publication of EP1086312A1 publication Critical patent/EP1086312A1/en
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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
    • F15B1/027—Installations or systems with accumulators having accumulator charging devices
    • 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
    • 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

  • Piston accumulator for pressure fluid to be supplied to a consumer in a hydraulic system
  • the invention relates to a piston accumulator for pressure fluid to be supplied to a consumer in a hydraulic system, in particular for the hydraulic actuation of the unloading device in non-self-propelled vehicles for bulk goods, with a piston which is arranged in a cylinder and divides the cylinder into an oil space and a gas space.
  • a switching plunger which is axially movable in the cylinder and which cooperates with its inner end with the piston and is guided with its outer end in the cylinder cover delimiting the gas space, and with a switch valve which can be actuated by the outer end of the switching plunger and serves as a switch-off device for the charging fluid flow and which is connected to the connection for the charging fluid flow in the oil chamber via a bypass pipeline which serves as a switchable bypass of the piston accumulator.
  • a piston accumulator of this type is known from DE 91 13 007 U1, which is provided for actuating the bulk material unloading device in railway wagons.
  • the hydraulic system provided in such wagons has at least one hydraulic pump driven by a wheel set in question, which pumps a charging fluid flow into the piston accumulator while the wagon is moving. If the set operating pressure in the accumulator is reached, the switch-off device causes the charging fluid flow to be diverted without pressure via the bypass pipeline to the tank connection of the hydraulic system and thus flows into the fluid reservoir.
  • the invention has for its object to provide a piston accumulator of the type mentioned, which is distinguished by a particularly simple and inexpensive construction.
  • this object is achieved according to the invention in that the outer end of the switching plunger is guided outwards by sealing through the cylinder cover and is accessible on the outside of the cylinder as an actuating element for the switching valve and that this is on the outside of the cylinder cover detachably attachable unit forms.
  • the cylinder cover itself is designed as a valve housing of the switching valve, which means that transverse bores for the valve connections and internal control surfaces must be present in the cylinder cover, which leads to a corresponding complication. tion and increases the cost, according to the invention a simply designed cylinder cover, which only ensures the gas-tight closure of the cylinder, is required.
  • a commercially available directional control valve can be used on the outside.
  • the advantage of this is also that it is particularly easy to maintain, because when the switching valve is replaced, it is not like the known one Piston accumulator which needs to be replaced with a cylinder cover, which represents an expensive component, but only the switching valve attached on the outside, so that a considerable reduction in maintenance costs is also achieved.
  • the switching plunger is guided so as to be longitudinally displaceable at its inner end provided for the interaction with the piston in a traverse located in the gas space and fastened to the inner wall of the cylinder.
  • This inner guidance opens up the possibility of designing the part of the cylinder defining the gas space in a considerable overall length, as a result of which the volume of the gas space inside the piston accumulator can be very large compared to the stroke volume of the piston in the oil space.
  • Figure 1 is a schematic block diagram of the piston accumulator with associated hydraulic circuit.
  • Fig. 2 shows a longitudinal section of the piston accumulator
  • Fig. 3 is a partial longitudinal section compared to Fig. 2 drawn on a larger scale, in which a part of the cylinder cover is shown with associated components.
  • the cylinder of a piston accumulator is denoted by 1, the interior of which is divided into an oil chamber 5 and a gas chamber 7 by a separating piston 3 arranged overhung.
  • 2 shows the piston 3 in its end position lying against the cylinder base 9, which corresponds to the operating state in which the oil chamber 5 is not charged by a supplied charging fluid flow, the volume of the oil chamber 5 under the influence of the compressed gas in the gas chamber 7 (at the
  • Embodiment N 2 therefore practical by moving the piston 3
  • the cylinder base 9 has a connection 1 1, to which the pressure fluid from the associated hydraulic pump 1 3 can be supplied via a check valve 1 5.
  • a second connection 1 7 on the cylinder base 9 enables the working fluid flow to be discharged via a check valve 19 to the consumer concerned, ie in the special case mentioned to the working cylinder of the associated bulk material unloading device.
  • a switching plunger 25 in the form of a relatively long round rod in the cylinder 1 is axially longitudinally displaceable.
  • a partition wall 29 fastened to a rib 27 on the inner wall of the cylinder 1 and having a gas passage 31 forms a guide for its axial movement at the inner end region of the switching plunger 25.
  • the switching plunger 25 is biased by its spring force, which in the exemplary embodiment shown is formed by a plate spring assembly 33 (see in particular FIG. 3), for its end position advanced against the separating piston 3, which is shown in FIG. 2, in which the Switch plunger 25 protrudes with its relevant end 35 beyond the partition wall 29 by a distance which is adapted to the actuation path of the actuator 37 of the switching valve 23.
  • the dividing wall 29 forms a mechanical stop for limiting the lifting movement of the separating piston 3 caused by the charging fluid flow, which, when in contact with the dividing wall 29 in cooperation with the end 35 of the switching plunger 25, counteracts the spring force of the plate spring assembly 33 for actuating the switching valve 23 shifts (to the right in Fig. 2).
  • the outer end of the switching plunger 25 opposite the partition 29 extends through a cylinder cover 39 screwed into the relevant end of the cylinder 1 as the end of the gas space 7, with a set of seals 41 for Forming a seal with respect to the bore 45 of the cylinder cover 39 cooperates with a tapered section 43 of the switching plunger 25.
  • This tapered section 43 extends through a dirt deflector 47 into an extension 49 of the bore 45, in which the switching plunger 25 forms a shoulder surface 51 in a knife passes even further tapered, end-side shaft part 53.
  • the extension 49 accommodates the plate spring assembly 33 surrounding the shaft part 53, which is supported on the one hand on the shoulder surface 51 of the switching plunger 25 and on the other hand on a threaded sleeve 57 screwed into an end internal thread 55 of the bore extension 49.
  • a filling valve, which can only be seen in FIG. 2, for supplying the compressed gas to the gas space 7 is designated by 59.
  • the end of the shaft part 53 of the switching plunger 25 forms a coupling member 61 for the articulated connection with the actuator 37 of the switching valve 23.
  • this is a commercially available directional valve of the slide type, which acts as a removable unit can be directly unscrewed from a base plate 72, which is connected to the cylinder cover 30 via a holding frame 63 and a screw connection 65.
  • the bypass pipeline 21 is connected to the switching valve 23 which, when actuated, ie when the switching plunger 23 displaces the actuator 37 against the acting spring force (to the right in the drawing), that prevailing in the pipeline 21 Turns on the boost pressure of the oil chamber 5 to a control line 67.
  • the pressure of the control line 67 releases a hydraulically unlockable check valve 69 connected to it.
  • the check valve 69 is switched so that it releases a fluid connection from the bypass pipeline 21 to the tank connection 71 in the unlocked state via a throttle 70 connected upstream of it.
  • the piston 3 acts on the switching plunger 25 and moves it against the acting spring force to actuate the switching valve 23 and accordingly Chend the charge pressure prevailing in the bypass pipe 21 to the control line 67, via the unlocked check valve 69 and the upstream throttle 70, the pressure-free discharge of the charging fluid flow takes place, so that the piston accumulator is hydraulically bridged.
  • the switching valve 23 returns to the switching state in which the pressure drops in the oil chamber 5 when the piston 3 moves away from the end 35 of the switching plunger 25 connected to the pipeline 21 is blocked and the control line 67 is connected to the tank connection 71, ie is depressurized.
  • the check valve 69 is no longer unlocked, and the bypass of the piston accumulator via the bypass pipeline 21 is prevented, so that the charging fluid flow for charging the piston accumulator can become effective again.

Abstract

The invention relates to a piston-type accumulator designed notably for hydraulically actuating the discharge unit in non-automotive bulk commodity vehicles. In said accumulator the cylinder (1) comprises a tappet (25) which can be axially displaced within the cylinder and when a defined load pressure is reached in the oil chamber (5) of the cylinder (1) can be displaced by the piston (3) so as to actuate a control valve (23). The valve serves as shut-off device for the loading fluid stream flowing to the oil chamber (5) and is positioned as a detachable module on the exterior face of the cylinder cover (39) in such a way that it can be actuated by the outer end of the tappet (25) which is guided towards the outside by passing in a sealed manner through the cylinder cover (39).

Description

Kolbenspeicher für einem Verbraucher in einer Hydraulikanlage zuzuführendes Druckfluid Piston accumulator for pressure fluid to be supplied to a consumer in a hydraulic system
Die Erfindung betrifft einen Kolbenspeicher für einem Verbraucher in einer Hydraulikanlage zuzuführendes Druckfluid, insbesondere zur hydraulischen Betätigung der Entladeeinrichtung bei nicht mit Eigenantrieb versehenen Fahrzeugen für Schüttgüter, mit einem in einem Zylinder fliegend angeord- neten, den Zylinder in einen Ölraum und einen Gasraum unterteilenden Kolben, am Ölraum vorgesehenen Anschlüssen für Zufuhr des Lade- Fluidstromes und Abfuhr des Arbeits-Fluidstromes, einem im Zylinder axial beweglichen Schaltstößel, der mit seinem inneren Ende mit dem Kolben zusammenwirkt und mit seinem äußeren Ende im den Gasraum begrenzen- den Zylinderdeckel geführt ist, und mit einem durch das äußere Ende des Schaltstößels betätigbaren, als Abschalteinrichtung für den Lade-Fluidstrom dienenden Schaltventil, das über eine als schaltbare Überbrückung des Kolbenspeichers dienende Umgehungs-Rohrleitung mit dem Anschluß für den Lade-Fluidstrom am Ölraum verbunden ist. Aus der DE 91 13 007 U1 ist ein Kolbenspeicher dieser Art bekannt, der zur Betätigung der Schüttgut-Entladeeinrichtung bei Eisenbahnwaggons vorgesehen ist. Die bei derartigen Waggons vorgesehene Hydraulikanlage weist mindestens eine durch einen betreffenden Radsatz angetriebene Hydropum- pe auf, die während der Fahrbewegung des Waggons einen Lade-Fluidstrom in den Kolbenspeicher pumpt. Wird hierbei der eingestellte Betriebsdruck im Speicher erreicht, bewirkt die Abschalteinrichtung, daß der Lade-Fluidstrom über die Umgehungs-Rohrleitung drucklos zum Tankanschluß der Hydraulikanlage umgeleitet wird und somit in den Fluid-Vorratsbehälter abfließt.The invention relates to a piston accumulator for pressure fluid to be supplied to a consumer in a hydraulic system, in particular for the hydraulic actuation of the unloading device in non-self-propelled vehicles for bulk goods, with a piston which is arranged in a cylinder and divides the cylinder into an oil space and a gas space. Connections provided on the oil space for supplying the charging fluid flow and discharging the working fluid flow, a switching plunger which is axially movable in the cylinder and which cooperates with its inner end with the piston and is guided with its outer end in the cylinder cover delimiting the gas space, and with a switch valve which can be actuated by the outer end of the switching plunger and serves as a switch-off device for the charging fluid flow and which is connected to the connection for the charging fluid flow in the oil chamber via a bypass pipeline which serves as a switchable bypass of the piston accumulator. A piston accumulator of this type is known from DE 91 13 007 U1, which is provided for actuating the bulk material unloading device in railway wagons. The hydraulic system provided in such wagons has at least one hydraulic pump driven by a wheel set in question, which pumps a charging fluid flow into the piston accumulator while the wagon is moving. If the set operating pressure in the accumulator is reached, the switch-off device causes the charging fluid flow to be diverted without pressure via the bypass pipeline to the tank connection of the hydraulic system and thus flows into the fluid reservoir.
Bei dem bekannten Kolbenspeicher führt die Kombination aus dem eigentlichen Druckspeicher und der Abschalteinrichtung für den Lade-Fluidstrom mit der dieser zugehörigen Betätigungseinrichtung zu einer aufwendigen Bauweise, was verhältnismäßig hohe Herstellungs- und Wartungskosten bedingt. Aufgrund der Vielzahl an zueinander bewegbaren Bauteilen ist der Verschleiß erhöht.In the known piston accumulator, the combination of the actual pressure accumulator and the switch-off device for the charging fluid flow with the actuating device associated therewith leads to a complex construction, which requires relatively high manufacturing and maintenance costs. Wear is increased due to the large number of components that can be moved relative to one another.
Der Erfindung liegt die Aufgabe zugrunde, einen Kolbenspeicher der besagten Art zu schaffen, der sich demgegenüber durch eine besonders einfache und kostengünstige Bauweise auszeichnet. Bei einem Kolbenspeicher der eingangs genannten Art ist diese Aufgabe erfindungsgemäß dadurch gelöst, daß das äußere Ende des Schaltstößels unter Abdichtung durch den Zylinderdeckel nach außen geführt und an der Außenseite des Zylinders als Betätigungsglied für das Schaltventil zugänglich ist und daß dieses eine an der Außenseite des Zylinderdeckels abnehmbar anbringbare Baueinheit bildet.The invention has for its object to provide a piston accumulator of the type mentioned, which is distinguished by a particularly simple and inexpensive construction. In a piston accumulator of the type mentioned, this object is achieved according to the invention in that the outer end of the switching plunger is guided outwards by sealing through the cylinder cover and is accessible on the outside of the cylinder as an actuating element for the switching valve and that this is on the outside of the cylinder cover detachably attachable unit forms.
Während bei dem erwähnten, bekannten Kolbenspeicher der Zylinderdeckel selbst als Ventilgehäuse des Schaltventiles ausgebildet ist, was bedeutet, daß im Zylinderdeckel Querbohrungen für die Ventilanschlüsse und innere Steu- erflächen vorhanden sein müssen, was zu einer entsprechenden Komplizie- rung und Verteuerung führt, ist erfindungsgemäß ein einfach gestalteter, lediglich den gasdichten Abschluß des Zylinders gewährleistender Zylinderdeckel erforderlich. An dessen Außenseite kann ein handelsübliches Wegeventil zur Anwendung kommen. Neben der Vereinfachung und Verbilligung, die dadurch erreicht ist, daß anstelle eines als Ventilgehäuse dienenden, aufwendig zu fertigenden Zylinderdeckels erfindungsgemäß ein einfacher Zylinderabschluß Verwendung findet, ergibt sich bei dieser auch der Vorteil der besonderen Wartungsfreundlichkeit, weil bei einem Ersatz des Schaltventils nicht wie beim bekannten Kolbenspeicher der ein teures Bauteil darstel- lende Zylinderdeckel ausgewechselt zu werden braucht, sondern lediglich das außen angesetzte Schaltventil, so daß auch eine beträchtliche Verringerung der Wartungskosten erreicht ist.While in the known piston accumulator mentioned, the cylinder cover itself is designed as a valve housing of the switching valve, which means that transverse bores for the valve connections and internal control surfaces must be present in the cylinder cover, which leads to a corresponding complication. tion and increases the cost, according to the invention a simply designed cylinder cover, which only ensures the gas-tight closure of the cylinder, is required. A commercially available directional control valve can be used on the outside. In addition to the simplification and cost-effectiveness that is achieved by using a simple cylinder cover instead of a cylinder cover serving as a valve housing, which is difficult to manufacture, the advantage of this is also that it is particularly easy to maintain, because when the switching valve is replaced, it is not like the known one Piston accumulator which needs to be replaced with a cylinder cover, which represents an expensive component, but only the switching valve attached on the outside, so that a considerable reduction in maintenance costs is also achieved.
Bei einem vorteilhaften Ausführungsbeispiel ist der Schaltstößel an seinem für die Zusammenwirkung mit dem Kolben vorgesehenen inneren Ende in einer im Gasraum befindlichen, an der Innenwand des Zylinders befestigten Traverse längsverschiebbar geführt. Diese innere Führung eröffnet die Möglichkeit, den den Gasraum definierenden Teil des Zylinders in einer beträchtlichen Baulänge auszubilden, wodurch erreicht wird, daß das Volu- men des Gasraumes innerhalb des Kolbenspeichers gegenüber dem Hubvolumen des Kolbens im Ölraum sehr groß werden kann. Dies hat den besonderen Vorteil, daß die sich über den gesamten Arbeitshub des Kolbens ergebende Druckdifferenz verhältnismäßig gering bleibt, was für den sicheren Betrieb der betreffenden Hydraulikanlage, also im speziellen Fall der Schüttgut-Entladeeinrichtung, besonders günstig ist.In an advantageous exemplary embodiment, the switching plunger is guided so as to be longitudinally displaceable at its inner end provided for the interaction with the piston in a traverse located in the gas space and fastened to the inner wall of the cylinder. This inner guidance opens up the possibility of designing the part of the cylinder defining the gas space in a considerable overall length, as a result of which the volume of the gas space inside the piston accumulator can be very large compared to the stroke volume of the piston in the oil space. This has the particular advantage that the pressure difference resulting over the entire working stroke of the piston remains relatively small, which is particularly favorable for the safe operation of the hydraulic system in question, that is to say in the special case of the bulk material unloading device.
Nachstehend ist die Erfindung an Hand eines in der Zeichnung dargestellten Ausführungsbeispieles im einzelnen erläutert. Es zeigen: Fig. 1 eine schematisierte Blockdarstellung des Kolbenspeichers mit zugehöriger hydraulischer Schaltung;The invention is explained in detail below using an exemplary embodiment shown in the drawing. Show it: Figure 1 is a schematic block diagram of the piston accumulator with associated hydraulic circuit.
Fig. 2 einen Längsschnitt des Kolbenspeichers undFig. 2 shows a longitudinal section of the piston accumulator and
Fig. 3 einen gegenüber Fig. 2 in größerem Maßstab gezeichneten Teillängsschnitt, in dem ein Teil des Zylinderdeckels mit zugehörigen Komponenten gezeigt ist.Fig. 3 is a partial longitudinal section compared to Fig. 2 drawn on a larger scale, in which a part of the cylinder cover is shown with associated components.
In der Blockdarstellung von Fig. 1 ist der Zylinder eines Kolbenspeichers mit 1 bezeichnet, dessen Innenraum durch einen fliegend angeordneten Trennkolben 3 in einen Ölraum 5 und einen Gasraum 7 unterteilt ist. Fig. 2 zeigt den Kolben 3 in seiner am Zylinderfuß 9 anliegenden Endstellung, was dem Betriebszustand entspricht, bei dem der Ölraum 5 nicht durch einen zugeführten Lade-Fluidstrom aufgeladen ist, das Volumen des Öl- raumes 5 unter Einfluß des im Gasraum 7 befindlichen Druckgases (beimIn the block diagram of FIG. 1, the cylinder of a piston accumulator is denoted by 1, the interior of which is divided into an oil chamber 5 and a gas chamber 7 by a separating piston 3 arranged overhung. 2 shows the piston 3 in its end position lying against the cylinder base 9, which corresponds to the operating state in which the oil chamber 5 is not charged by a supplied charging fluid flow, the volume of the oil chamber 5 under the influence of the compressed gas in the gas chamber 7 (at the
Ausführungsbeispiel N2) durch Verschieben des Kolbens 3 daher praktischEmbodiment N 2 ) therefore practical by moving the piston 3
auf null reduziert ist.is reduced to zero.
Für die Zufuhr des Lade-Fluidstromes zum Ölraum 5 weist der Zylinderfuß 9 einen Anschluß 1 1 auf, zu dem das Druckfluid von der zugeordneten Hydro pumpe 1 3 über ein Rückschlagventil 1 5 zuführbar ist. Ein zweiter Anschluß 1 7 am Zylinderfuß 9 ermöglicht die Abfuhr des Arbeits- Fluidstromes über ein Rückschlagventil 19 zum betreffenden Verbraucher, d.h. im erwähnten speziellen Fall zum Arbeitszylinder der zugeordneten Schüttgut-Entladeeinrichtung. Eine über das Rückschlagventil 1 5 mit dem Anschluß 1 1 am Ölraum 5 in Verbindung stehende Umgehungs- Rohrleitung 21 bildet für den Lade-Fluid ström eine Überbrückung des Kolbenspeichers und bildet in Zusammenwirkung mit einem mit der Rohrlei- tung 21 verbundenen, mit dem Rückschlagventil 69 zusammenwirkenden Schaltventil 23 eine Abschalteinrichtung für den Lade-Fluidstrom.For the supply of the charging fluid flow to the oil chamber 5, the cylinder base 9 has a connection 1 1, to which the pressure fluid from the associated hydraulic pump 1 3 can be supplied via a check valve 1 5. A second connection 1 7 on the cylinder base 9 enables the working fluid flow to be discharged via a check valve 19 to the consumer concerned, ie in the special case mentioned to the working cylinder of the associated bulk material unloading device. A bypass valve 21, which is connected to the connection 1 1 at the oil chamber 5 via the check valve 15, forms a bridging of the piston accumulator for the charging fluid flow and forms in cooperation with one with the pipe line. device 21 connected, interacting with the check valve 69 switching valve 23 a shutdown device for the charging fluid flow.
Als Betätigungsglied für das Schaltventil 23 ist ein Schaltstößel 25 in Form eines verhältnismäßig langen Rundstabes im Zylinder 1 axial längsverschiebbar. Eine an einer Rippe 27 an der Innenwand des Zylinders 1 befestigte Trennwand 29 mit einem Gasdurchlaß 31 bildet am inneren Endbereich des Schaltstößels 25 eine Führung für dessen Axialbewegung. Der Schaltstößel 25 ist durch die Federkraft einer Federanordnung, die beim gezeigten Ausführungsbeispiel durch ein Tellerfederpaket 33 (siehe insbesondere Fig. 3) gebildet ist, für seine gegen den Trennkolben 3 hin vorgeschobene Endstellung vorgespannt, die in Fig. 2 gezeigt ist, bei der der Schaltstößel 25 mit seinem betreffenden Ende 35 über die Trennwand 29 hinaus um eine Strecke vorspringt, die dem Betätigungsweg des Stellgliedes 37 des Schaltventiles 23 angepaßt ist. Die Trennwand 29 bildet einen mechanischen Anschlag für die Begrenzung der durch den Lade-Fluidstrom bewirkten Hubbewegung des Trennkolbens 3, der bei Anlage an der Trennwand 29 in Zusammenwirkung mit dem Ende 35 des Schaltstößels 25 diesen gegen die Federkraft des Tellerfederpakets 33 zur Betätigung des Schaltventiles 23 verschiebt (in der Fig. 2 nach rechts).As an actuator for the switching valve 23, a switching plunger 25 in the form of a relatively long round rod in the cylinder 1 is axially longitudinally displaceable. A partition wall 29 fastened to a rib 27 on the inner wall of the cylinder 1 and having a gas passage 31 forms a guide for its axial movement at the inner end region of the switching plunger 25. The switching plunger 25 is biased by its spring force, which in the exemplary embodiment shown is formed by a plate spring assembly 33 (see in particular FIG. 3), for its end position advanced against the separating piston 3, which is shown in FIG. 2, in which the Switch plunger 25 protrudes with its relevant end 35 beyond the partition wall 29 by a distance which is adapted to the actuation path of the actuator 37 of the switching valve 23. The dividing wall 29 forms a mechanical stop for limiting the lifting movement of the separating piston 3 caused by the charging fluid flow, which, when in contact with the dividing wall 29 in cooperation with the end 35 of the switching plunger 25, counteracts the spring force of the plate spring assembly 33 for actuating the switching valve 23 shifts (to the right in Fig. 2).
Wie den Fig. 2 und 3 zu entnehmen ist, erstreckt sich das der Trennwand 29 entgegengesetzte, äußere Ende des Schaltstößels 25 durch einen als Abschluß des Gasraumes 7 in das betreffende Ende des Zylinders 1 einge- schraubten Zylinderdeckel 39 hindurch, wobei ein Dichtungssatz 41 zur Bildung einer Abdichtung gegenüber der Bohrung 45 des Zylinderdeckels 39 mit einem verjüngten Abschnitt 43 des Schaltstößels 25 zusammenwirkt. Dieser verjüngte Abschnitt 43 erstreckt sich durch einen Schmutzabweiser 47 hindurch in eine Erweiterung 49 der Bohrung 45 hinein, in der der Schaltstößel 25 unter Bildung einer Schulterfläche 51 in einen im Durch- messer noch weiter verjüngten, endseitigen Schaftteil 53 übergeht. Die Erweiterung 49 nimmt das den Schaftteil 53 umgebende Tellerfederpaket 33 auf, das sich einerseits an der Schulterfläche 51 des Schaltstößel 25 und andererseits an einer in ein endseitiges Innengewinde 55 der Bohrungser- Weiterung 49 eingeschraubten Gewindehülse 57 abstützt. Ein nur in Fig. 2 zu sehendes Füllventil für die Zufuhr des Druckgases zum Gasraum 7 ist mit 59 bezeichnet.As can be seen in FIGS. 2 and 3, the outer end of the switching plunger 25 opposite the partition 29 extends through a cylinder cover 39 screwed into the relevant end of the cylinder 1 as the end of the gas space 7, with a set of seals 41 for Forming a seal with respect to the bore 45 of the cylinder cover 39 cooperates with a tapered section 43 of the switching plunger 25. This tapered section 43 extends through a dirt deflector 47 into an extension 49 of the bore 45, in which the switching plunger 25 forms a shoulder surface 51 in a knife passes even further tapered, end-side shaft part 53. The extension 49 accommodates the plate spring assembly 33 surrounding the shaft part 53, which is supported on the one hand on the shoulder surface 51 of the switching plunger 25 and on the other hand on a threaded sleeve 57 screwed into an end internal thread 55 of the bore extension 49. A filling valve, which can only be seen in FIG. 2, for supplying the compressed gas to the gas space 7 is designated by 59.
Wie insbesondere aus Fig. 3 zu ersehen ist, bildet das Ende des Schaftteiles 53 des Schaltstößels 25 ein Kupplungsglied 61 für die gelenkige Verbindung mit dem Stellglied 37 des Schaltventiles 23. Dieses ist beim Ausführungsbeispiel ein handelsübliches Wegeventil vom Schieber-Typ, das als abnehmbare Baueinheit von einer Grundplatte 72 unmittelbar abschraubbar ist, die über einen Halterahmen 63 und eine Verschraubung 65 mit dem Zylinderdeckel 30 verbunden ist.As can be seen in particular from FIG. 3, the end of the shaft part 53 of the switching plunger 25 forms a coupling member 61 for the articulated connection with the actuator 37 of the switching valve 23. In the exemplary embodiment, this is a commercially available directional valve of the slide type, which acts as a removable unit can be directly unscrewed from a base plate 72, which is connected to the cylinder cover 30 via a holding frame 63 and a screw connection 65.
Wie Fig. 1 zeigt, ist die Umgehungs-Rohrleitung 21 mit dem Schaltventil 23 verbunden, welches bei Betätigung, d.h., wenn der Schaltstößel 23 das Stellglied 37 gegen die wirkende Federkraft verschiebt (in der Zeichnung nach rechts), den in der Rohrleitung 21 herrschenden Ladedruck des Öl- raumes 5 zu einer Steuerleitung 67 durchschaltet. Durch den Druck der Steuerleitung 67 wird ein mit dieser in Verbindung stehendes, hydraulisch entsperrbares Rückschlagventil 69 entsperrt. Das Rückschlagventil 69 ist so geschaltet, daß es im entsperrten Zustand über eine ihm vorgeschaltete Drossel 70 eine Fluidverbindung von der Umgehungs-Rohrleitung 21 zum Tankanschluß 71 freigibt.As shown in FIG. 1, the bypass pipeline 21 is connected to the switching valve 23 which, when actuated, ie when the switching plunger 23 displaces the actuator 37 against the acting spring force (to the right in the drawing), that prevailing in the pipeline 21 Turns on the boost pressure of the oil chamber 5 to a control line 67. The pressure of the control line 67 releases a hydraulically unlockable check valve 69 connected to it. The check valve 69 is switched so that it releases a fluid connection from the bypass pipeline 21 to the tank connection 71 in the unlocked state via a throttle 70 connected upstream of it.
Wenn bei Erreichen eines vorbestimmten Ladedruckes im Ölraum 5 der Kolben 3 den Schaltstößel 25 beaufschlagt und gegen die wirkende Feder- kraft zur Betätigung des Schaltventils 23 verschiebt und dieses dementspre- chend den in der Umgehungs-Rohrleitung 21 herrschenden Ladedruck zur Steuerleitung 67 durchschaltet, erfolgt über das entsperrte Rückschlagventil 69 und die vorgeschaltete Drossel 70 die drucklose Abfuhr des Lade- Fluidstromes, so daß der Kolbenspeicher hydraulisch überbrückt ist. Auf- grund der am Schaltventil 23 und dem Schaltstößel 25 wirkenden, vorspannenden Federkraft kehrt bei einem Abfall des Ladedruckes im Ölraum 5, bei dem sich der Kolben 3 vom Ende 35 des Schaltstößels 25 entfernt, das Schaltventil 23 in den Schaltzustand zurück, bei dem der mit der Rohrleitung 21 verbundene Anschluß gesperrt ist und die Steuerleitung 67 mit dem Tankanschluß 71 verbunden, d.h drucklos ist. Somit ist das Rückschlagventil 69 nicht länger entsperrt, und die Überbrückung des Kolbenspeichers über die Umgehungs-Rohrleitung 21 ist unterbunden, so daß der Lade-Fluidstrom zur Aufladung des Kolbenspeichers wieder wirksam werden kann. If, when a predetermined charge pressure in the oil chamber 5 is reached, the piston 3 acts on the switching plunger 25 and moves it against the acting spring force to actuate the switching valve 23 and accordingly Chend the charge pressure prevailing in the bypass pipe 21 to the control line 67, via the unlocked check valve 69 and the upstream throttle 70, the pressure-free discharge of the charging fluid flow takes place, so that the piston accumulator is hydraulically bridged. On account of the prestressing spring force acting on the switching valve 23 and the switching plunger 25, the switching valve 23 returns to the switching state in which the pressure drops in the oil chamber 5 when the piston 3 moves away from the end 35 of the switching plunger 25 connected to the pipeline 21 is blocked and the control line 67 is connected to the tank connection 71, ie is depressurized. Thus, the check valve 69 is no longer unlocked, and the bypass of the piston accumulator via the bypass pipeline 21 is prevented, so that the charging fluid flow for charging the piston accumulator can become effective again.

Claims

P a t e n t a n s p r ü c h e Patent claims
1 . Kolbenspeicher für einem Verbraucher in einer Hydraulikanlage zuzuführendes Druckfluid, insbesondere zur hydraulischen Betätigung der Entladeeinrichtung bei nicht mit Eigenantrieb versehenen Fahrzeugen für Schüttgüter, mit einem in einem Zylinder (1 ) fliegend angeordne- ten, den Zylinder in einen Ölraum (5) und einen Gasraum (7) unterteilenden Kolben (3), am Ölraum (5) vorgesehenen Anschlüssen (1 1 bzw. 1 7) für Zufuhr des Lade-Fluidstromes und Abfuhr des Arbeits- Fluidstromes, einem im Zylinder (1 ) axial beweglichen Schaltstößel (25), der mit seinem inneren Ende (35) mit dem Kolben (3) zusam- menwirkt und mit seinem äußeren Ende im den Gasraum (7) begrenzenden Zylinderdeckel (39) geführt ist, und mit einem durch das äußere Ende des Schaltstößels (25) betätigbaren, als Abschalteinrichtung für den Lade-Fluidstrom dienenden Schaltventil (23), das über eine als schaltbare Überbrückung des Kolbenspeichers dienende Umgehungs- Rohrleitung (21 ) mit dem Anschluß (1 1 ) für den Lade-Fluidstrom am1 . Piston accumulator for a hydraulic fluid to be supplied to a consumer in a hydraulic system, in particular for the hydraulic actuation of the unloading device in the case of non-self-propelled vehicles for bulk goods, with a cylinder arranged in a cylinder (1), the cylinder in an oil chamber (5) and a gas chamber ( 7) dividing piston (3), on the oil chamber (5) provided connections (1 1 and 1 7) for supplying the charging fluid flow and discharging the working fluid flow, an axially movable switching plunger (25) in the cylinder (1), the with its inner end (35) cooperates with the piston (3) and with its outer end is guided in the cylinder cover (39) delimiting the gas space (7), and with an actuatable by the outer end of the switching plunger (25) as Switch-off device for the switching fluid valve (23) serving the charging fluid flow, which has a bypass pipeline (21) with the connection (1) serving as a switchable bridging of the piston accumulator 1) for the charging fluid flow on
Ölraum (5) verbunden ist, dadurch gekennzeichnet, daß das äußere Ende des Schaltstößels (25) unter Abdichtung durch den Zylinderdek- kel (39) nach außen geführt und an der Außenseite des Zylinders (1 ) als Betätigungsglied für das Schaltventil (23) zugänglich ist und daß dieses eine an der Außenseite des Zylinderdeckels (39) abnehmbar anbringbare Baueinheit bildet.Oil chamber (5) is connected, characterized in that the outer end of the switching plunger (25) is guided outwards under sealing by the cylinder cover (39) and is accessible on the outside of the cylinder (1) as an actuating element for the switching valve (23) and that this forms a removable unit on the outside of the cylinder cover (39).
2. Kolbenspeicher nach Anspruch 1 , dadurch gekennzeichnet, daß der Schaltstößel (25) an seinem für die Zusammenwirkung mit dem Kol- ben (3) vorgesehenen inneren Ende (35) in einer im Gasraum (7) befindlichen, an der Innenwand des Zylinders (1 ) befestigten Traverse (29) längsverschiebbar geführt ist. 2. Piston accumulator according to claim 1, characterized in that the switching plunger (25) at its inner end (35) provided for the interaction with the piston (3) in a gas chamber (7) located on the inner wall of the cylinder ( 1) attached crossbar (29) is guided to be longitudinally displaceable.
3. Kolbenspeicher nach Anspruch 2, dadurch gekennzeichnet, daß die Traverse in Form einer Trennwand (29) mit zumindest einem Gasdurchlaß (31 ) ausgebildet ist, die einen die Bewegung des Kolbens (3) begrenzenden Anschlag bildet, über den das Ende (35) des Schaitstö- ßels (25) bei vom Anschlag entfernter Stellung des Kolbens (3) um eine der Länge des Betätigungsweges des Schaltventils (23) entsprechende Strecke unter Einwirkung einer vorspannenden Federkraft vorsteht, so daß der Schaltstößel (25) bei Anlaufen des Kolbens (3) am Anschlag gegen die Federkraft zur Betätigung des Schaltventils (23) verschiebbar ist.3. Piston accumulator according to claim 2, characterized in that the traverse is designed in the form of a partition (29) with at least one gas passage (31) which forms a stop limiting the movement of the piston (3), via which the end (35) of the switching plunger (25) with the piston (3) removed from the stop by a distance corresponding to the length of the actuation path of the switching valve (23) under the action of a prestressing spring force, so that the switching plunger (25) when the piston (3 ) against the spring force for actuating the switching valve (23).
4. Kolbenspeicher nach Anspruch 3, dadurch gekennzeichnet, daß zur Erzeugung der Federkraft ein Tellerfederpaket (33) vorgesehen ist, das in einer endseitigen Erweiterung (49) der für den Durchtritt des4. Piston accumulator according to claim 3, characterized in that a plate spring assembly (33) is provided for generating the spring force, which in an end extension (49) for the passage of the
Schaltstößels (25) im Zylinderdeckel (39) befindlichen Bohrung (45) aufgenommen ist.Switch plunger (25) in the cylinder cover (39) located bore (45) is received.
5. Kolbenspeicher nach Anspruch 4, dadurch gekennzeichnet, daß der Schaltstößel (25) am äußeren Ende zur Bildung einer Schulterfläche5. Piston accumulator according to claim 4, characterized in that the switching plunger (25) at the outer end to form a shoulder surface
(51 ) einen verjüngten, endseitigen Schaftteil (53) besitzt, der sich in der endseitigen Erweiterung (49) der Bohrung (45) des Zylinderdek- kels (39) durch das Tellerpaket (33) hindurch erstreckt, das sich einerseits an der Schulterfläche (51 ) des Schaltstößels (25) und andererseits an einer in die Erweiterung (49) der Bohrung (45) des Zylinderdeckels(51) has a tapered, end-side shaft part (53) which extends in the end-side enlargement (49) of the bore (45) of the cylinder cover (39) through the plate pack (33), which extends on the one hand on the shoulder surface ( 51) of the switching plunger (25) and on the other hand in an extension (49) of the bore (45) of the cylinder cover
(39) einschraubbaren Gewindehülse (57) abstützt.(39) screw-in threaded sleeve (57) supports.
6. Kolbenspeicher nach Anspruch 5, dadurch gekennzeichnet, daß das als Betätigungsglied des Schaltventils dienende Ende des Schaltstößels (25) ein Kupplungsglied (61 ) für die Verbindung mit dem beweglichen Stellglied (37) des am Zylinderdeckel (39) anbringbaren Schaltventils (23) aufweist.6. Piston accumulator according to claim 5, characterized in that the serving as an actuator of the switching valve end of the switching plunger (25) is a coupling member (61) for connection to the movable Has actuator (37) of the switching valve (23) which can be attached to the cylinder cover (39).
7. Kolbenspeicher nach einem der Ansprüche 1 bis 6, dadurch gekenn- zeichnet, daß als Schaltventil ein handelsübliches Wegeventil (23) vorgesehen ist.7. Piston accumulator according to one of claims 1 to 6, characterized in that a commercially available directional valve (23) is provided as the switching valve.
8. Kolbenspeicher nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß für die Bildung einer die Abschaltung des Lade- Fluidstromes bewirkenden Fluidverbindung zwischen der Umgehungs-Rohrleitung (21 ) und dem Tankanschluß (71 ) der Hydraulikanlage ein mittels des Schaltventils hydraulisch entsperrbares Rückschlagventil (69) mit diesem vorgeschalteter Drossel (70) vorgesehen ist. 8. Piston accumulator according to one of claims 1 to 7, characterized in that for the formation of a shutdown of the charging fluid flow causing fluid connection between the bypass pipe (21) and the tank connection (71) of the hydraulic system, a hydraulically unlockable check valve by means of the switching valve (69) with this upstream throttle (70) is provided.
EP99927842A 1998-06-19 1999-06-02 Piston-type accumulator for a hydraulic fluid to be supplied to a consumer in a hydraulic installation Expired - Lifetime EP1086312B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19827363 1998-06-19
DE19827363A DE19827363A1 (en) 1998-06-19 1998-06-19 Piston store for hydraulic fluid in vehicle for friable goods without own drive
PCT/EP1999/003816 WO1999067536A1 (en) 1998-06-19 1999-06-02 Piston-type accumulator for a hydraulic fluid to be supplied to a consumer in a hydraulic installation

Publications (2)

Publication Number Publication Date
EP1086312A1 true EP1086312A1 (en) 2001-03-28
EP1086312B1 EP1086312B1 (en) 2003-05-21

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EP99927842A Expired - Lifetime EP1086312B1 (en) 1998-06-19 1999-06-02 Piston-type accumulator for a hydraulic fluid to be supplied to a consumer in a hydraulic installation

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EP (1) EP1086312B1 (en)
JP (1) JP2002519590A (en)
AT (1) ATE241087T1 (en)
DE (2) DE19827363A1 (en)
DK (1) DK1086312T3 (en)
ES (1) ES2200523T3 (en)
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WO (1) WO1999067536A1 (en)

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PT1086312E (en) 2003-10-31
EP1086312B1 (en) 2003-05-21
DE59905659D1 (en) 2003-06-26
US6332477B1 (en) 2001-12-25
DK1086312T3 (en) 2003-09-15
WO1999067536A1 (en) 1999-12-29
ES2200523T3 (en) 2004-03-01
DE19827363A1 (en) 1999-12-23
ATE241087T1 (en) 2003-06-15
JP2002519590A (en) 2002-07-02

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