DE1286278B - Device for balancing at least part of the weight of a machine part - Google Patents
Device for balancing at least part of the weight of a machine partInfo
- Publication number
- DE1286278B DE1286278B DEC41185A DEC0041185A DE1286278B DE 1286278 B DE1286278 B DE 1286278B DE C41185 A DEC41185 A DE C41185A DE C0041185 A DEC0041185 A DE C0041185A DE 1286278 B DE1286278 B DE 1286278B
- Authority
- DE
- Germany
- Prior art keywords
- pressure
- pressure medium
- cylinder
- piston rod
- engine
- 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.)
- Pending
Links
Classifications
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- 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
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/14—Energy-recuperation means
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- 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
- F15B1/024—Installations or systems with accumulators used as a supplementary power source, e.g. to store energy in idle periods to balance pump load
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- 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
- F15B1/025—Installations or systems with accumulators used for thermal compensation, e.g. to collect expanded fluid and to return it to the system as the system fluid cools down
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- 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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
- F15B11/028—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force
- F15B11/036—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force by means of servomotors having a plurality of working chambers
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- 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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/06—Servomotor systems without provision for follow-up action; Circuits therefor involving features specific to the use of a compressible medium, e.g. air, steam
- F15B11/064—Servomotor systems without provision for follow-up action; Circuits therefor involving features specific to the use of a compressible medium, e.g. air, steam with devices for saving the compressible medium
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- 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
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
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- 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
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1466—Hollow piston sliding over a stationary rod inside the cylinder
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- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/21—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge
- F15B2211/212—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge the pressure sources being accumulators
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- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/305—Directional control characterised by the type of valves
- F15B2211/30505—Non-return valves, i.e. check valves
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- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/40—Flow control
- F15B2211/415—Flow control characterised by the connections of the flow control means in the circuit
- F15B2211/41581—Flow control characterised by the connections of the flow control means in the circuit being connected to an output member and a return line
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- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/40—Flow control
- F15B2211/42—Flow control characterised by the type of actuation
- F15B2211/428—Flow control characterised by the type of actuation actuated by fluid pressure
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- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/40—Flow control
- F15B2211/45—Control of bleed-off flow, e.g. control of bypass flow to the return line
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- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/50—Pressure control
- F15B2211/505—Pressure control characterised by the type of pressure control means
- F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
- F15B2211/50518—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using pressure relief valves
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- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/50—Pressure control
- F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
- F15B2211/5158—Pressure control characterised by the connections of the pressure control means in the circuit being connected to a pressure source and an output member
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- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/625—Accumulators
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- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
- F15B2211/7051—Linear output members
- F15B2211/7055—Linear output members having more than two chambers
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- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/80—Other types of control related to particular problems or conditions
- F15B2211/875—Control measures for coping with failures
- F15B2211/8755—Emergency shut-down
Description
Die Erfindung betrifft eine Einrichtung für den Ausgleich mindestens eines Teiles des Gewichtes eines Maschinenteils, das durch einen hydraulischen Hubzylinder betätigt wird, dessen Kolbenstange eine an ihrem inneren Ende offene Längsbohrung aufweist, welche durch einen feststehenden, mit dem Kopfende des Zylinders über ein Rohr verbundenen Kolben als Druckraum ausgebildet ist, bei dessen Beaufschlagung mit Druckmittel die Kolbenstange aus dem Zylinder ausgefahren oder in den Zylinder eingezogen wird.The invention relates to a device for balancing at least part of the weight of a machine part, which is lifted by a hydraulic lifting cylinder is actuated, the piston rod of which has a longitudinal bore open at its inner end has, which by a fixed, with the head end of the cylinder over a pipe connected piston is designed as a pressure chamber, when it is acted upon the piston rod is extended out of the cylinder or into the cylinder with pressure medium is withdrawn.
Bekannt ist eine solche Einrichtung für die Verriegelung einer Fahrwerkeinziehstrebe.Such a device for locking a landing gear retractable strut is known.
Der vorliegenden Erfindung liegt demgegenüber die Aufgabe zugrunde, bei Hubzylindern der bekannten Bauart Vorkehrungen zu treffen, um einen Teil des Gewichtes eines Maschinenteiles ausgleichen zu können.In contrast, the present invention is based on the object in the case of lifting cylinders of the known type, precautions must be taken to prevent part of the To be able to compensate for the weight of a machine part.
Die Lösung dieser Aufgabe kennzeichnet sich ausgehend von einer Einrichtung der eingangs als bekannt vorausgesetzten Art erfindungsgemäß durch einen Hydraulikkreis, der einen Druckspeicher aufweist, der durch die Ausfahr- und Einziehbewegung der Kolbenstange auf einen bestimmten Druck aufladbar ist.The solution to this problem is characterized by a facility of the type assumed to be known at the beginning according to the invention by a hydraulic circuit, which has a pressure accumulator, which by the extension and retraction movement of the Piston rod is chargeable to a certain pressure.
Vorzugsweise wird die Anordnung so getroffen, daß der hydraulische Hubzylinder und das ihm zugeordnete Maschinenteil von einem motorgetriebenen Fahrzeug getragen werden, wobei der Hydraulikkreis ein Ventil aufweist, das zwischen einem Druckmittelbehälter und dem Druckspeicher angeordnet ist und bei Betrieb des Motors geschlossen wird und den Druckmittelstrom vom Druckspeicher zum Druckmittelbehälter verhindert, während es bei Stillstand des Motors den Druckmittelstrom vom Druckspeicher zum Druckmittelbehälter gestattet.Preferably, the arrangement is made so that the hydraulic Lifting cylinder and the machine part assigned to it from an engine-driven vehicle be carried, the hydraulic circuit having a valve which is between a Pressure medium container and the pressure accumulator is arranged and when the engine is running is closed and the pressure medium flow from the pressure accumulator to the pressure medium container prevents the flow of pressure medium from the pressure accumulator when the engine is at a standstill allowed to the pressure medium tank.
Die Erfindung gestattet es bei Fahrzeugen wie Planierraupen, Kratzbaggern u. dgl. das Gewicht von hydraulisch zu betätigenden Zusatzeinrichtungen oder Werkzeugen, deren Antriebskraft im allgemeinen auch vom Hauptantriebsmotor abgeleitet wird, auszugleichen. Häufig beläuft sich das Gewicht solcher hydraulisch zu betätigender Fahrzeugteile auf einige Tonnen, und die zur Bewegung erforderliche Kraft beträgt selbst im unbelasteten Zustand oft mehr als 10 % der Nennleistung des Motors. Durch die erfindungsgemäße Anordnung wird selbst dann eine überlastung des Motors vermieden, wenn beim Manövrieren des Fahrzeuges eine hydraulische Betätigung der Werkzeuge od. dgl. erfolgen soll. Bei der Erfindung wird sonst nutzlos verschwendete Energie für den Ausgleich des Gewichtes der hydraulisch zu betätigenden Teile verwendet.The invention allows it in vehicles such as bulldozers, scraper excavators etc. the weight of hydraulically operated additional devices or tools, whose driving force is generally derived from the main drive motor, balance. The weight of such hydraulically actuated ones is often Vehicle parts to a few tons, and the force required to move is often more than 10% of the rated power of the motor even in an unloaded state. By the arrangement according to the invention will even then avoid overloading the motor, if hydraulic actuation of the tools when maneuvering the vehicle or the like should take place. In the invention, otherwise wasted energy becomes useless used to balance the weight of the hydraulically operated parts.
In den Zeichnungen sind bevorzugte Ausführungsbeispiele der Erfindung dargestellt. Es zeigt F i g. 1 einen Längsschnitt eines ersten Ausführungsbeispieles der Erfindung, F i g. 2 einen Längsschnitt eines zweiten Ausführungsbeispieles der Erfindung und F i g. 3 eine schematische Darstellung eines hydraulischen Kreises, in dem eines der in den F i g. 1 und 2 gezeigten Ausführungsbeispiele Verwendung findet.In the drawings are preferred embodiments of the invention shown. It shows F i g. 1 shows a longitudinal section of a first embodiment of the invention, FIG. 2 shows a longitudinal section of a second embodiment of FIG Invention and F i g. 3 a schematic representation of a hydraulic circuit, in which one of the FIGS. 1 and 2 shown embodiments use finds.
In F i g. 1 ist ein doppelt wirkender hydraulischer Hubzylinder 10 gezeigt, aus dessen Zylindergehäuse 12 eine Kolbenstange 14 hervorsteht, die zum Anheben oder Handhaben einer Last dient. Das Stangenende des Zylinders 12 ist mit einem abnehmbaren Boden 16 versehen, an dem ein Dichtungsflansch 18 durch Schrauben 19 befestigt ist. Dichtungen 22 dichten die Kolbenstange 14 gegenüber dem Boden 16 und eine Dichtung 24 diesen gegenüber dem Zylinder 12 ab.In Fig. 1 shows a double-acting hydraulic lifting cylinder 10 , from the cylinder housing 12 of which a piston rod 14 protrudes, which is used for lifting or handling a load. The rod end of the cylinder 12 is provided with a removable bottom 16 to which a sealing flange 18 is fastened by screws 19. Seals 22 seal the piston rod 14 from the base 16 and a seal 24 seals this from the cylinder 12.
Das im Zylinder 12 liegende innere Ende der Kolbenstange 14 ist mit einem Ringkolben 26 versehen, der mittels einer Mutter 30 in Anlage an einer Umfangsschulter 28 der Kolbenstange gehalten wird. Der Kolben 26 wird durch eine O-Ringdichtung 32 gegenüber der Zylinderinnenwand abgedichtet. Die Kolbenstange 14 ist mit einer Bohrung 34 versehen, die in Längsrichtung von dem inneren Ende der Kolbenstange 14 bis in den Bereich des äußeren Endes der Kolbenstange verläuft. Der mit der Bohrung 34 verfolgte Zweck geht aus der nachfolgenden Beschreibung hervor.The inner end of the piston rod 14 located in the cylinder 12 is provided with an annular piston 26 which is held in contact with a circumferential shoulder 28 of the piston rod by means of a nut 30. The piston 26 is sealed off from the inner wall of the cylinder by an O-ring seal 32. The piston rod 14 is provided with a bore 34 which extends in the longitudinal direction from the inner end of the piston rod 14 to the region of the outer end of the piston rod. The purpose pursued with the bore 34 will emerge from the description below.
Ein Rohr 36 erstreckt sich vom Kopfende des Zylinders 12 derart nach unten, daß es sowohl in ausgefahrener als auch in zurückgezogener Stellung der Kolbenstange 14 innerhalb der Bohrung 34 der Kolbenstange liegt. Das untere Ende des Rohres 36 ist mit einem Ringkolben 38 versehen, der an der Innenwand der Bohrung 34 druckmitteldicht anliegt. Das obere Ende des Rohres 36 weist einen Teil 40 mit verringertem Durchmesser auf, der durch eine Öffnung im Kopf des Zylinders 12 hervorsteht und an dem Zylinderkopf durch eine Mutter 42 starr befestigt ist. Ein Druckmittelkana144, der durch die gesamte Länge des Rohres 36 verläuft, ist an einen Hydraulikkreis angeschlossen, der weiter unten im Zusammenhang mit F i g. 3 beschrieben wird.A tube 36 extends downwardly from the head end of the cylinder 12 such that it lies within the bore 34 of the piston rod in both the extended and retracted positions of the piston rod 14. The lower end of the tube 36 is provided with an annular piston 38 which rests against the inner wall of the bore 34 in a pressure-tight manner. The upper end of the tube 36 has a reduced diameter portion 40 which protrudes through an opening in the head of the cylinder 12 and is rigidly secured to the cylinder head by a nut 42. A pressure medium conduit 144, which runs through the entire length of the pipe 36, is connected to a hydraulic circuit which is described below in connection with FIG. 3 will be described.
Der normale Betrieb des doppelt wirkenden hydraulischen Hubzylinders 10 wird durch einen (nicht dargestellten) üblichen Hydraulikkreis hervorgerufen, der unter Druck stehendes Druckmittel wahlweise durch eine der Einlaßöffnungen 46 oder 48 am Kopfende bzw. am Stangenende des Zylinders dem Zylinder zuführt, um dadurch die Kolbenstange 14 auszufahren oder einzuziehen. Der Hubzylinder 10 ist durch bekannte Mittel zwischen dem Fahrzeug und einem zu verstellenden Teil des Fahrzeuges angebracht. Wenn von einer außenliegenden Druckmittelquelle, wie z. B. einem Druckspeicher, Druckmittel durch den Druckmittelkanal 44 geschickt wird, kann genügend Kraft in der Bohrung 34 hervorgerufen werden, um das Gewicht des Fahrzeugteiles aufzunehmen oder auszugleichen. Dabei kann dann der in der Öffnung 46 eingeführte Druckmitteldruck vollständig für die Handhabung der reinen Nutzlast verwendet werden.The normal operation of the double-acting hydraulic lifting cylinder 10 is brought about by a (not shown) conventional hydraulic circuit, which supplies pressurized pressure medium either through one of the inlet openings 46 or 48 at the head end or at the rod end of the cylinder to the cylinder, thereby the piston rod 14 extend or retract. The lift cylinder 10 is mounted between the vehicle and an adjustable portion of the vehicle by known means. If from an external pressure medium source, such as. B. a pressure accumulator, pressure medium is sent through the pressure medium channel 44, sufficient force can be generated in the bore 34 to absorb or compensate for the weight of the vehicle part. The pressure medium pressure introduced into the opening 46 can then be used entirely for handling the pure payload.
In F i g. 2 ist ein abgewandeltes Ausführungsbeispiel eines doppelt wirkenden Hubzylinders gezeigt, bei der die Kolbenstange zur Handhabung einer Last eingezogen statt ausgefahren wird. Viele Einzelteile des in F i g. 2 gezeigten Beispieles 10' sind identisch mit zuvor unter Bezugnahme auf das Beispiel 10 gemäß F i g. 1 beschriebenen Einzelheiten. Infolgedessen werden zur Kennzeichnung dieser Einzelteile in F i g. 2 die den gleichen Einzelteilen in F i g. 1 entsprechenden Bezugszahlen mit einem Strich verwendet.In Fig. 2 shows a modified embodiment of a double-acting lifting cylinder in which the piston rod is retracted instead of extended to handle a load. Many individual parts of the in FIG. Examples 10 'shown in FIG. 2 are identical to those previously with reference to example 10 according to FIG. 1 described details. As a result, to identify these items in F i g. 2 which have the same items in FIG. 1 corresponding reference numerals are used with a prime.
Das Rohr 37 bei dem Ausführungsbeispiel gemäß F i g. 2 weist einen erheblich kleineren Außendurchmesser auf als das Rohr 36 gemäß F i g. 1, und das untere Ende des Kanals 44' wird durch eine Verschlußkappe 39 verschlossen. Außerdem ist das obere Ende der Stangenbohrung 34' mit einem ringförmigen Stopfen 41 versehen, der druckmitteldicht an dem Rohr 37 anliegt. Dadurch wird eine Kammer 43 mit ringförmigem Querschnitt gebildet, deren obere und untere Stirnwände durch die Teile 41 bzw. 38' gebildet werden. Mehrere radial verlaufende Bohrungen 45 stellen eine Verbindung zwischen dem Kanal 44' in dem Rohr 37 und der Kammer 43 her.The pipe 37 in the embodiment according to FIG. 2 has a considerably smaller outer diameter than the tube 36 according to FIG. 1, and the lower end of the channel 44 'is closed by a closure cap 39. In addition, the upper end of the rod bore 34 ′ is provided with an annular plug 41 which rests against the pipe 37 in a pressure-tight manner. This forms a chamber 43 with an annular cross-section, the upper and lower end walls of which are formed by the parts 41 and 38 ', respectively. A plurality of radially extending bores 45 establish a connection between the channel 44 ′ in the tube 37 and the chamber 43.
Wenn die Kammer 43 beaufschlagt wird, ist die Kolbenstange 14' bestrebt, sich in den Zylinder 12' hineinzubewegen. Der Druck in der Kammer 43 kann so hoch gewählt werden, daß das Gewicht des angehängten Maschinenteiles ausgeglichen wird, so daß der am Anschluß 48' eingeführte Druck vollständig zur Handhabung der von dem Maschinenteil getragenen reinen Nutzlast verwendet werden kann. Ein kleines Einwegventil 47 ist im Kolben 38' vorgesehen, um den Rücklauf von Druckmittel, das in das untere Ende der Stangenbohrung 34' gelangt sein mag, in die Kammer 43 zu ermöglichen.When the chamber 43 is acted upon, the piston rod 14 'tries to move into the cylinder 12'. The pressure in the chamber 43 can be selected to be so high that the weight of the attached machine part is counterbalanced so that the pressure introduced at the connection 48 'can be used entirely for handling the pure payload carried by the machine part. A small one-way valve 47 is provided in the piston 38 'in order to allow pressure medium, which may have entered the lower end of the rod bore 34', to flow back into the chamber 43 .
F i g. 3 zeigt einen Hydraulikkreis, an den ein hydraulischer Hubzylinder 10 gemäß F i g. 1 angeschlossen ist. In F i g. 3 ist ein bekannter hydraulischer Druckspeicher 55 mit einem Kolben 56 und einem Vorrat an komprimierbarem Druckmittel 57 dargestellt, der an eine Leitung 59 über eine Leitung 61 und ein Drucksteuerventil63 angeschlossen ist. Der Druckspeicher 55 ist ferner mit einem Druckmitteltank 65 über eine Leitung 67, ein Sicherheitsventil 69 und eine Leitung 71 verbunden.F i g. 3 shows a hydraulic circuit to which a hydraulic lifting cylinder 10 according to FIG. 1 is connected. In Fig. 3 shows a known hydraulic pressure accumulator 55 with a piston 56 and a supply of compressible pressure medium 57 , which is connected to a line 59 via a line 61 and a pressure control valve 63. The pressure accumulator 55 is also connected to a pressure medium tank 65 via a line 67, a safety valve 69 and a line 71.
Der Druckspeicher 55 wird zunächst in der üblichen Weise dadurch geladen, daß abwechselnd Druckmittel aus einem Hydraulikkreis (nicht dargestellt) den Anschlüssen 46 und 48 des hydraulischen Hubzylinders zugeführt wird. Durch die Ausfahrbewegung der Kolbenstange 14 wird zunächst Druckmittel aus dem Tank 65 durch ein Rückschlagventil 73 und die Leitung 59 in die Kammer 34 der Kolbenstangenbohrung (siehe F i g. 1) gezogen, während die umgekehrte Bewegung der Kolbenstange 14 dieses Druckmittel zurück durch die Leitung 59 und durch ein Rückschlagventil 75 in den Druckspeicher 55 schickt. Aufeinanderfolgende Arbeitsgänge des Hubzylinders 10 führen schließlich dazu, daß der Druckspeicher 55 auf einen bestimmten Druck aufgeladen worden ist, unter dem sich das Drucksteuerventil 63 öffnet. Weitere Hübe der Kolbenstange 14 haben dann auf Grund des Druckes, der sich in den Leitungen 59 und 67 aufgebaut hat, keinen Einfluß mehr auf die Rückschlagventile 73 und 75.The pressure accumulator 55 is initially charged in the usual way by alternately supplying pressure medium from a hydraulic circuit (not shown) to the connections 46 and 48 of the hydraulic lifting cylinder. The extension movement of the piston rod 14 first draws pressure medium from the tank 65 through a check valve 73 and the line 59 into the chamber 34 of the piston rod bore (see FIG. 1), while the reverse movement of the piston rod 14 pulls this pressure medium back through the line 59 and sends through a check valve 75 into the pressure accumulator 55. Successive operations of the lifting cylinder 10 ultimately lead to the pressure accumulator 55 being charged to a certain pressure under which the pressure control valve 63 opens. Further strokes of the piston rod 14 then no longer have any influence on the check valves 73 and 75 due to the pressure that has built up in the lines 59 and 67.
Wenn der Druck im Druckspeicher 55 seine wirksame Höhe erreicht hat, bleibt das Drucksteuerventil 63 offen, um die Strömung von Druckmittel durch die Leitung 59 in beiden Richtungen zu gestatten. Wenn die Lastausgleichskammer in der Stangenbohrung 34 größer wird, strömt Druckmittel aus dem Druckspeicher 55 in die Kammer nach, und wenn die Kammer ihr Volumen verringert, fließt Druckmittel zurück zum Druckspeicher. Falls durch Leckverluste in der Anlage der Druck im Druckspeicher 55 unter einen bestimmten Mindestwert sinkt, schließt sich das Drucksteuerventil 63, und wenn die Kolbenstange 14 ausgefahren und eingezogen wird, wird der Hydraulikkreis wieder durch den Strom von Druckmittel durch die Rückschlagventile 73 und 75 aufgeladen, wie zuvor beschrieben wurde. Das Sicherheitsventil 69 ist mit einem Schieber 77 versehen, der normalerweise durch eine Feder 80 in die geöffnete Stellung des Ventils gedrückt wird. Wenn jedoch der Motor des Fahrzeuges läuft, gelangt der Schmieröldruck des Motors durch eine Leitung 82 in das Ventil 69 und drückt den Schieber 77 gegen eine Umfangsschulter 81, wie in F i g. 3 dargestellt ist, und unterbricht dadurch die Druckmittelverbindung zwischen dem Druckspeicher 55 und dem Tank 65. Wenn der Motor abgestellt wird oder der Öldruck des Motors aus anderen Gründen ausbleibt, wird der Schieber 77 durch die Feder 80 in eine Stellung gedrückt, in der die Verbindung zwischen dem Druckspeicher 55 und dem Tank 65 hergestellt ist. Eine derartige Anordnung gestattet es als eine Sicherheitsvorkehrung, daß die Teile des hydraulischen Hubzylinders bei längeren Abschaltzeiten in eine Ruhestellung gebracht werden können.When the pressure in the accumulator 55 has reached its effective level, the pressure control valve 63 remains open to allow the flow of pressure medium through the line 59 in both directions. When the load compensation chamber in the rod bore 34 becomes larger, pressure medium flows from the pressure accumulator 55 into the chamber, and when the chamber reduces its volume, pressure medium flows back to the pressure accumulator. If the pressure in the pressure accumulator 55 falls below a certain minimum value due to leakage losses in the system, the pressure control valve 63 closes, and when the piston rod 14 is extended and retracted, the hydraulic circuit is recharged by the flow of pressure medium through the check valves 73 and 75, as previously described. The safety valve 69 is provided with a slide 77 which is normally pressed by a spring 80 into the open position of the valve. However, when the engine of the vehicle is running, the lubricating oil pressure of the engine passes through a line 82 into the valve 69 and presses the spool 77 against a circumferential shoulder 81, as in FIG. 3 is shown, and thereby interrupts the pressure medium connection between the pressure accumulator 55 and the tank 65. If the engine is switched off or the oil pressure of the engine fails for other reasons, the slide 77 is pressed by the spring 80 into a position in which the connection between the pressure accumulator 55 and the tank 65 is established. Such an arrangement allows, as a safety precaution, that the parts of the hydraulic lifting cylinder can be brought into a rest position during longer shutdown times.
Wenngleich eine besondere Ausführungsform des Sicherheitsventils 69 veranschaulicht ist, sei darauf hingewiesen, daß jede andere geeignete Form verwendet werden könnte. Beispielsweise könnte das Ventil 69 auf irgendein Signal ansprechen, daß den Betrieb des Fahrzeugmotors anzeigt. Zusätzlich zu dem Öldruck des Motors könnte das Ventil 69 auch durch Getriebesteuerdruck oder durch Druck aus der Pumpe der Hauptsteueranlage gesteuert werden, die immer dann wirksam ist, wenn der Motor läuft. Bei einem elektrisch getriebenen Fahrzeug könnte das Ventil auf das öffnen oder Schließen des Hauptstromschalters hin elektromagnetisch gesteuert werden.While a particular embodiment of the safety valve 69 is illustrated, it should be understood that any other suitable shape could be used. For example, valve 69 could be responsive to any signal indicative of vehicle engine operation. In addition to the oil pressure of the engine, the valve 69 could also be controlled by transmission control pressure or by pressure from the pump of the main control system, which is always effective when the engine is running. In the case of an electrically powered vehicle, the valve could be controlled electromagnetically in response to the opening or closing of the main power switch.
Claims (2)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US519855A US3353352A (en) | 1966-01-11 | 1966-01-11 | Load balancing system for hydraulic jack |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE1286278B true DE1286278B (en) | 1969-01-02 |
Family
ID=24070089
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DEC41185A Pending DE1286278B (en) | 1966-01-11 | 1967-01-11 | Device for balancing at least part of the weight of a machine part |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US3353352A (en) |
| DE (1) | DE1286278B (en) |
| FR (1) | FR1507468A (en) |
| GB (1) | GB1118060A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2403293A1 (en) * | 1977-09-15 | 1979-04-13 | Jungheinrich Kg | HYDRAULIC LIFTING DEVICE FOR GROUND HANDLING TROLLEY AND LIFTING FRAME FOR SUCH A DEVICE |
| DE3608338A1 (en) * | 1986-03-13 | 1987-09-17 | Fuchs Systemtechnik Gmbh | Hydraulic actuator for an electrode support arm of an arc furnace |
| EP0317076A2 (en) * | 1987-11-16 | 1989-05-24 | General Motors Corporation | Hydraulic actuator for active ride suspension |
| NL1029161C2 (en) * | 2005-06-01 | 2006-12-04 | Actuant Corp | Hydraulic drive cylinder with gas spring action for e.g. opening and closing car doors, includes stationary tube with internal volume connected to blind axial bore in piston rod |
| DE102007061294A1 (en) | 2007-12-10 | 2009-06-18 | Thomas Sauer | Hydraulic cylinder has three lifting chambers and piston-shaped lifting chamber, which has fluid opening to hydraulic pipe on working machine side lying in bore of piston rod |
Families Citing this family (27)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1159465A (en) * | 1966-07-06 | 1969-07-23 | Hugo Cordes | Control for a Ramming Hammer with Hydraulic Drive |
| US3548573A (en) * | 1968-04-17 | 1970-12-22 | Cessna Aircraft Co | Cylinder with integral accumulator |
| US3680400A (en) * | 1969-05-14 | 1972-08-01 | Mesta Machine Co | Force-multiplying mechanisms |
| US3622124A (en) * | 1970-05-18 | 1971-11-23 | Kenneth R Sidles | Hydraulic lift jack |
| FR2208571A6 (en) * | 1972-11-29 | 1974-06-21 | Inst Francais Du Petrole | |
| FR2256822B1 (en) * | 1974-01-04 | 1977-06-10 | Patent & Inventions Ltd | |
| US4409884A (en) * | 1981-03-25 | 1983-10-18 | Mcdonnell Douglas Corporation | Synchronization cylinder |
| GB8503501D0 (en) * | 1985-02-12 | 1985-03-13 | Thomsen Sales & Service Ltd A | Reciprocatory pumps |
| CA1299207C (en) * | 1987-01-08 | 1992-04-21 | Charles B. Steger | Dual acting hydraulic actuator for active suspension system |
| SE461391B (en) * | 1987-10-28 | 1990-02-12 | Bt Ind Ab | HYDRAULIC LIFTING DEVICE |
| US4955282A (en) * | 1989-03-27 | 1990-09-11 | Ranson Ronald W | Uniform flow hydraulic system |
| US5099749A (en) * | 1990-04-19 | 1992-03-31 | Darish Joseph J | Compound motion fluid actuating device and method |
| US5172625A (en) * | 1991-11-04 | 1992-12-22 | Latham Robert P | Hydraulic cylinder with lateral support |
| JPH05340407A (en) * | 1992-06-04 | 1993-12-21 | Etsuo Ando | Hydraulic cylinder |
| US5191825A (en) * | 1992-06-12 | 1993-03-09 | Doben Limited | Low-impact air cylinder |
| FR2753751B1 (en) * | 1996-09-23 | 1999-01-08 | SINGLE ACTING HYDRAULIC CYLINDER DEVICE | |
| US7448310B2 (en) * | 2004-03-11 | 2008-11-11 | Atkisek Corporation | Innerscoping hydraulic system |
| US20070068754A1 (en) * | 2005-09-26 | 2007-03-29 | Furgala George W | Gas-biased hydraulic cylinder |
| DE102011106260A1 (en) * | 2011-05-18 | 2012-11-22 | Liebherr-Hydraulikbagger Gmbh | Working implement, in particular excavator or machine for material handling |
| GB2498190A (en) * | 2012-01-04 | 2013-07-10 | Nat Oilwell Varco Lp | Apparatus and method for positioning and connecting equipment on a drilling rig |
| US9435359B2 (en) * | 2012-02-13 | 2016-09-06 | Schlumberger Technology Corporation | Adaptive hydraulic cylinder with floating seal interface |
| JP6085163B2 (en) * | 2012-12-13 | 2017-02-22 | 株式会社昭和 | Energy-saving hydraulic cylinder device for used paper compression packaging machine |
| DE102013013690A1 (en) * | 2013-08-16 | 2015-02-19 | Hydac Technology Gmbh | System for automatically adapting a predefinable amount of gas input and actuating device with such a system |
| CN104154070A (en) * | 2014-08-22 | 2014-11-19 | 实用动力(中国)工业有限公司 | Double-acting nut-locking hydrocylinder |
| US9494168B2 (en) * | 2014-08-26 | 2016-11-15 | Ut-Battelle, Llc | Energy efficient fluid powered linear actuator with variable area and concentric chambers |
| US9964124B2 (en) * | 2015-09-02 | 2018-05-08 | Deere & Company | Piston accumulator with integrated cylinder rod |
| CN116624442A (en) * | 2023-07-24 | 2023-08-22 | 南京理工大学 | Electric putter rocking arm braced system with moment of gravity compensation |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB133119A (en) * | ||||
| US1509000A (en) * | 1924-03-17 | 1924-09-16 | George N Simpson | Power mechanism |
| US2193736A (en) * | 1936-11-14 | 1940-03-12 | Onions John Henry | Fluid pressure motor |
| US2351398A (en) * | 1941-12-29 | 1944-06-13 | Darrell Marsden Dowding | Hydrovacuumatic balance |
| US2664859A (en) * | 1950-09-11 | 1954-01-05 | Timken Roller Bearing Co | Hydraulically controlled fluid driven reciprocating actuator |
| US2641106A (en) * | 1952-01-03 | 1953-06-09 | Cleveland Automatic Machine Co | Electrohydraulic system having a safety shutoff valve for its accumulator |
| US2896583A (en) * | 1956-12-28 | 1959-07-28 | Jarvis A Stixrood | Counterbalancing hydraulic cylinder |
| US2833556A (en) * | 1957-01-30 | 1958-05-06 | Athey Products Corp | Weight transfer system and apparatus for tractor-trailers |
| US3237406A (en) * | 1962-12-10 | 1966-03-01 | Raymond Int Inc | Hydraulic hammer |
| US3186305A (en) * | 1963-07-02 | 1965-06-01 | Ex Cell O Corp | Hydraulic actuator mechanism |
-
1966
- 1966-01-11 US US519855A patent/US3353352A/en not_active Expired - Lifetime
- 1966-12-02 GB GB54101/66A patent/GB1118060A/en not_active Expired
-
1967
- 1967-01-04 FR FR89940A patent/FR1507468A/en not_active Expired
- 1967-01-11 DE DEC41185A patent/DE1286278B/en active Pending
Non-Patent Citations (1)
| Title |
|---|
| None * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2403293A1 (en) * | 1977-09-15 | 1979-04-13 | Jungheinrich Kg | HYDRAULIC LIFTING DEVICE FOR GROUND HANDLING TROLLEY AND LIFTING FRAME FOR SUCH A DEVICE |
| DE3608338A1 (en) * | 1986-03-13 | 1987-09-17 | Fuchs Systemtechnik Gmbh | Hydraulic actuator for an electrode support arm of an arc furnace |
| EP0317076A2 (en) * | 1987-11-16 | 1989-05-24 | General Motors Corporation | Hydraulic actuator for active ride suspension |
| EP0317076A3 (en) * | 1987-11-16 | 1989-10-25 | General Motors Corporation | Hydraulic actuator for active ride suspension |
| NL1029161C2 (en) * | 2005-06-01 | 2006-12-04 | Actuant Corp | Hydraulic drive cylinder with gas spring action for e.g. opening and closing car doors, includes stationary tube with internal volume connected to blind axial bore in piston rod |
| DE102007061294A1 (en) | 2007-12-10 | 2009-06-18 | Thomas Sauer | Hydraulic cylinder has three lifting chambers and piston-shaped lifting chamber, which has fluid opening to hydraulic pipe on working machine side lying in bore of piston rod |
Also Published As
| Publication number | Publication date |
|---|---|
| FR1507468A (en) | 1967-12-29 |
| US3353352A (en) | 1967-11-21 |
| GB1118060A (en) | 1968-06-26 |
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