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DE3217786A1 - Hydraulic lifting device for agricultural machines - Google Patents

Hydraulic lifting device for agricultural machines

Info

Publication number
DE3217786A1
DE3217786A1 DE19823217786 DE3217786A DE3217786A1 DE 3217786 A1 DE3217786 A1 DE 3217786A1 DE 19823217786 DE19823217786 DE 19823217786 DE 3217786 A DE3217786 A DE 3217786A DE 3217786 A1 DE3217786 A1 DE 3217786A1
Authority
DE
Germany
Prior art keywords
working piston
piston rod
spring
piston
stop
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
DE19823217786
Other languages
German (de)
Inventor
Josef 7961 Hüttenreute Gebele
Hans-Hermann Dr. Harms
Erwin 7968 Saulgau Reber
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.)
Claas Saulgau GmbH
Original Assignee
Claas Saulgau 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.)
Filing date
Publication date
Application filed by Claas Saulgau GmbH filed Critical Claas Saulgau GmbH
Priority to DE19823217786 priority Critical patent/DE3217786A1/en
Publication of DE3217786A1 publication Critical patent/DE3217786A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • 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
    • F15B15/1447—Pistons; Piston to piston rod assemblies
    • 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
    • F15B15/148—Lost-motion means between the piston and the output
    • 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
    • F15B15/149—Fluid interconnections, e.g. fluid connectors, passages

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)

Abstract

The proposed hydraulic lifting device has a cylinder (1) with a working piston (2) which is guided movably to and fro therein and is subjected to pressure medium on both sides and which is connected to a piston rod (3) mounted displaceably on its end face in the cylinder (1). For a venting of the hydraulic-oil circuit, the working piston (2) is guided on the piston rod (3) axially movably between the stops (7 and 8) counter to the force of a spring (9) and has at its guide on the piston rod (3) an oil passage (10) which, in one stop position (at the stop 7) of the working piston (2), is closed sealingly by means of the force of the spring (9) and which is open during the movement of the working piston (2) into the other stop position (at the stop 8), which takes place as a result of the bearing of the piston rod (3) against the cylinder bottom (14), the working piston (2) being moved on the screw (5) by means of oil pressure axially until the spring (9) is in the block state. <IMAGE>

Description

Hydraulische Hubeinrichtung für landwirtschaftliche MaschinenHydraulic lifting device for agricultural machines

Die Erfindung bezieht sich auf eine hydraulische Hubeinrichtung für landwirtschaftliche Maschinen nach dem Gattungsbegriff des Anspruches 1.The invention relates to a hydraulic lifting device for agricultural machines according to the generic term of claim 1.

Hydraulische Hubeinrichtungen, die bei landwirtschaftlichen Maschinen vor allem zur Schwenkbewegung von Stell- und Geräteteilen verwendet werden, arbeiten nur dann störungs- und fehlerfrei, wenn im gesamten Druckmittel kreislauf keine Luftblasen eingeschlossen sind. Letzteres ist jedoch nicht über eine längere Zeitdauer zu erreichen, weil Luftblasen Im Druckmittel kreislauf immer wieder durch beispielsweise Undichtigkeiten der Rohrleitungen oder Geräte, durch die Verwendung von Schneilkupplungen zum raschen Lösen von Schlauchleitungen, durch Schäumen des hydraulischen Druckmittels oder auch durch örtliche Erhitzungen beim Betrieb der Maschine entstehen.Hydraulic lifting devices used in agricultural machinery mainly used for the pivoting movement of control and device parts, work only trouble-free and error-free if none in the entire pressure medium circuit Air bubbles are included. However, the latter is not over a longer period of time to achieve because air bubbles in the pressure medium circuit repeatedly through, for example Leakages in the pipelines or devices due to the use of snap couplings for quick release of hose lines by foaming the hydraulic pressure medium or caused by local heating during operation of the machine.

Es ist deshalb dringend erforderlich, eine Möglichkeit für die Entlüftung der Druckmittel kreisläufe zu schaffen. Hierzu ist es bekannt, von Hand zu betätigende Entlüftungsschrauben vorzusehen, die an erhöht liegenden Stellen des Druckmittelsystems angeordnet werden, wo sich hauptsächlich die Luftblasen festsetzen. Nachteilig hierbei ist, daß die Entlüftung von Hand und an Stellen der Maschine vorgenommen werden muß, die von der bedienenden Person nur sehr schwer und unter Unfallgefahr erreicht werden können. Außerdem tritt bei jedem Entiüftungsvorgang Öl ins Freie, was zu einer unangenehmen Verschmutzung der Maschine sowie der bedienenden Person führt.It is therefore imperative to have some way of venting to create pressure medium circuits. For this purpose it is known to be operated by hand Provide vent screws at elevated points of the pressure medium system be arranged where mainly the air bubbles settle. Disadvantage here is that the ventilation is carried out by hand and at points on the machine must, which is achieved by the operator only with great difficulty and with the risk of accidents can be. In addition, with every venting process, oil leaks into the open, which to unpleasant soiling of the machine and the operator.

Der Erfindung liegt die Aufgabe zu Grunde, eine hydraulische Hubeinrichtung der im Gattungsbegriff des Anspruches 1 genannten Art zu schaffen, die,ohne Öffnung des Druckmittelkreislaufes nach außenleine Entlüftung vom Schleppersitz aus erlaubt.The invention is based on the object of a hydraulic lifting device to create the type mentioned in the generic term of claim 1, without opening of the pressure medium circuit to the outside, ventilation from the tractor seat is permitted.

Die gestellte Aufgabe wird durch Maßnahmen entsprechend dem Kennzeichen des Anspruches 1 sowie in weiterer Ausgestaltung entsprechend den Kennzeichnungsmerkmalen aus den übrigen Ansprüchen gelöst.The task is set by measures according to the indicator of claim 1 and in a further embodiment according to the identification features solved from the other claims.

In der Zeichnung ist ein Ausführungsbeispiel der Erfindung an einem doppelt wirkenden Hydraulikzylinder in Schnittdarstellung gezeigt und nachfolgend näher beschrieben.In the drawing, an embodiment of the invention is on one double-acting hydraulic cylinder shown in sectional view and below described in more detail.

Mit 1 ist ein Zylinder mit einem darin axial geführten Arbeitskolben 2 bezeichnet, dessen Kolbenstange 3 durch die Stirnwand 4 des Zylinders 1 hindurchgeführt ist.With 1 is a cylinder with a working piston axially guided therein 2, the piston rod 3 of which is passed through the end wall 4 of the cylinder 1 is.

Der Arbeitskolben 2 ist auf einer stirnseitig in die Kolbenstange 3 eingeschraubten Schraube 5 mit Kopf 6 zwischen den beiden Anschlägen 7 und 8 axialbeweglich gegen die Kraft einer Feder 9 geführt, die aus einem auf die Schraube 5 aufgeschobenen und am Anschlag 8 anliegenden Tellerfedernpaket 9 besteht. Im Bereich der Lagerung des Arbeitskolbens 2 auf der Schraube 5 weist diese an ihrem Umfang eine Abflachung 10 auf. Der Arbeitskolben 2 wird durch die Feder 9 mit seiner Stirnseite 11 so gegen die -Stirnseite 7 (als Anschlag 7) der Kolbenstange 3 gepreßt, daß kein Drucköl vom kolbenstangenseitigen Zylinderraum 12 in den kolbenseitigen Zylinderraum 13 fließen kann (gestrichelt gezeichnete Lage des Arbeitskolbens 2).The working piston 2 is on an end face in the piston rod 3 screwed in screw 5 with head 6 between the two stops 7 and 8 axially movable guided against the force of a spring 9, which consists of a pushed onto the screw 5 and plate spring pack 9 resting against the stop 8. In the area of storage of the working piston 2 on the screw 5, this has a flattening on its circumference 10 on. The working piston 2 is counteracted by the spring 9 with its end face 11 the end face 7 (as a stop 7) of the piston rod 3 pressed that no pressure oil from the cylinder space 12 on the piston rod side into the cylinder space 13 on the piston side can flow (position of working piston 2 shown in dashed lines).

Für eine Entlüftung des Druckölkreislaufes wird der Arbeitskolben 2 bis in die mit ausgezogenen Linien gezeichnete Lage gesteuert, in der die Kolbenstange 3 über den Kopf 6 der Schraube 5 am Zylinderboden 14 anliegt. Der Arbeitskolben 2 ist dabei vom Drucköl des kolbenstangenseitigen Arbeitsraumes 12 auf der Schraube 5 axial bis zur Blocklage der Feder 9 bewegt, wodurch die Dichtung zwischen den Stirnseiten 7 der Kolbenstange 5 und 11 des Arbeitskolbens 2 aufgehoben ist. Das Drucköl mit den eingeschlossenen Luftblasen kann also vom kolbenstangenseltigen Arbeitsraum 12 durch den über der Abflachung 10 an der Schraube 5 gebildeten Raum in den kolbenseitigen Arbeitsraum 13 fließen. Der Arbeitskolben 2 wird solange in dieser Endstellung gehalten, bis alle Luftblasen aus dem Druckölkreislauf in den Öltank transportiert sind.The working piston is used to vent the pressure oil circuit 2 controlled to the position drawn with solid lines in which the piston rod 3 rests on the cylinder base 14 via the head 6 of the screw 5. The working piston 2 is from the pressure oil of the piston rod-side working space 12 on the screw 5 axial moved up to the block position of the spring 9, whereby the seal lifted between the end faces 7 of the piston rod 5 and 11 of the working piston 2 is. The pressure oil with the enclosed air bubbles can therefore come from the piston rod Working space 12 through the space formed above the flat 10 on the screw 5 flow into the piston-side working space 13. The working piston 2 is in this end position held until all air bubbles from the pressure oil circuit into the Oil tank are transported.

Die Druckölanschlüsse am Zylinder 1 sind mit 15 und 16 bezeichnet.The pressure oil connections on cylinder 1 are denoted by 15 and 16.

Claims (4)

Patentansprüche 1. Hydraulische Hubeinrichtung für landwirtschaftliche Maschinen mit einem in einem Zylinder hin- und herbewegbar geführten, beidseitig druckmittelbeaufschlagten Arbeitskolben, der mit einer stirnseitig im Zylinder verschiebbar gelagerten Kolbenstange verbunden ist, dadurch gekennzeichnet, daß der Arbeitskolben (2) auf der Kolbenstange (3) zwischen zwei Anschlägen (7,8) axial beweglich gegen die Kraft einer Feder (9) geführt ist und an seiner Führung auf der Kolbenstange (3) einen bidurchgang (10) aufweist, der in einer Anschlagstellung (am Anschlag 7) des Arbeitskolbens (2) durch die Kraft der Feder (9) dicht verschlossen und bei Bewegung des Arbeitskolbens (2) in die andere Anschlagstellung (am Anschlag 8) offen ist, die durch Anlaufen und Halten der Kolbenstange (3) in der entsprechenden Endlage durch Öldruck erfolgt. Claims 1. Hydraulic lifting device for agricultural Machines with a reciprocable guided in a cylinder, both sides Pressurized working piston, which can be displaced in the cylinder with a front side mounted piston rod is connected, characterized in that the working piston (2) on the piston rod (3) between two stops (7,8) axially movable against the force of a spring (9) is guided and on its guide on the piston rod (3) has a bi-passage (10) which in a stop position (at the stop 7) of the working piston (2) is tightly closed by the force of the spring (9) and at Movement of the working piston (2) into the other stop position (at stop 8) open by starting and holding the piston rod (3) in the corresponding end position done by oil pressure. 2. Hydr. Hubeinrichtung nach Anspruch 1, dadurch gekennzeichnet, daß als Lagerung für den Arbeitskolben (2) eine stirnseitig in die Kolbenstange (3) eingeschraubte Schraube (5) mit Kopf (6) dient, die im Bereich der Lagerung des Arbeitskolbens (2) an ihrem Umfang eine Abflachung (10) für den Öldurchgang aufweist.2. Hydraulic lifting device according to claim 1, characterized in that as a bearing for the working piston (2), one in the front of the piston rod (3) The screwed-in screw (5) with head (6) is used in the area of the storage of the Working piston (2) has a flat (10) on its circumference for the oil passage. 3. Hydr. Hubeinrichtung nach Ansprüchen 1 u. 2, dadurch gekennzeichnet, daß in einer Anschlagstellung (durch Anschlag 7) der Arbeitskolben (2) stirnseitig an einer Stirnseite (7) der Kolbenstange (3) durch die Feder (9) angepreßt und gegen Öldurchgang dichtend anliegt, wobei die Feder (9) konzentrisch auf der Schraube (5) zwischen der anderen Stlrnseite des Arbeitskolbens (2) und dem Kopf (6) (als Anschlag 8) der Schraube (5) gelagert ist.3. Hydraulic lifting device according to claims 1 and 2, characterized in that that in a stop position (by stop 7) the working piston (2) on the front side pressed against one end face (7) of the piston rod (3) by the spring (9) and against The oil passage rests tightly, the spring (9) concentrically on the screw (5) between the other face of the working piston (2) and the head (6) (as Stop 8) of the screw (5) is mounted. 4. Hydr. Hubeinrichtung nach Ansp-r. 3, dadurch gekennzeichnet, daß die Feder (9) ein Tellerfedernpaket ist.4. Hydraulic lifting device according to claim. 3, characterized in that the spring (9) is a disk spring package.
DE19823217786 1982-05-12 1982-05-12 Hydraulic lifting device for agricultural machines Withdrawn DE3217786A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19823217786 DE3217786A1 (en) 1982-05-12 1982-05-12 Hydraulic lifting device for agricultural machines

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19823217786 DE3217786A1 (en) 1982-05-12 1982-05-12 Hydraulic lifting device for agricultural machines

Publications (1)

Publication Number Publication Date
DE3217786A1 true DE3217786A1 (en) 1983-11-17

Family

ID=6163332

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19823217786 Withdrawn DE3217786A1 (en) 1982-05-12 1982-05-12 Hydraulic lifting device for agricultural machines

Country Status (1)

Country Link
DE (1) DE3217786A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4923014A (en) * 1983-12-22 1990-05-08 Multinorm B.V. Agricultural implement with gas springs and control
FR2894303A1 (en) * 2005-12-02 2007-06-08 Pommier S C E B P Sa Shock-absorbing hydraulic cylinder is divided into narrow chamber and wide chamber by peripheral shoulder, piston of smaller diameter than narrow chamber being mounted in slide which fits closely in wider chamber
CN102829019A (en) * 2012-09-06 2012-12-19 临沂金利液压科技有限公司 High-performance hydraulic cylinder with oil distribution device
DE19909751B4 (en) * 1998-03-10 2016-02-11 Aisin Aw Co., Ltd. Hydraulic servo for automatic transmission

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1259711B (en) * 1960-07-01 1968-01-25 Lucien Fulhaber Hydropneumatic pressure booster with automatic fluid supplementation
US3390616A (en) * 1965-10-19 1968-07-02 William L. Hammer Fluid pressure cylinders having load responsive piston valves
DE2151194A1 (en) * 1971-10-14 1973-04-19 Cascade Corp RELIEF VALVE
DE2245129A1 (en) * 1972-09-14 1974-03-21 Bosch Gmbh Robert WORK CYLINDER
FR2441751A1 (en) * 1978-11-18 1980-06-13 Stabilus Gmbh CYLINDER AND PISTON DEVICE

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1259711B (en) * 1960-07-01 1968-01-25 Lucien Fulhaber Hydropneumatic pressure booster with automatic fluid supplementation
US3390616A (en) * 1965-10-19 1968-07-02 William L. Hammer Fluid pressure cylinders having load responsive piston valves
DE2151194A1 (en) * 1971-10-14 1973-04-19 Cascade Corp RELIEF VALVE
DE2245129A1 (en) * 1972-09-14 1974-03-21 Bosch Gmbh Robert WORK CYLINDER
FR2441751A1 (en) * 1978-11-18 1980-06-13 Stabilus Gmbh CYLINDER AND PISTON DEVICE

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4923014A (en) * 1983-12-22 1990-05-08 Multinorm B.V. Agricultural implement with gas springs and control
DE19909751B4 (en) * 1998-03-10 2016-02-11 Aisin Aw Co., Ltd. Hydraulic servo for automatic transmission
FR2894303A1 (en) * 2005-12-02 2007-06-08 Pommier S C E B P Sa Shock-absorbing hydraulic cylinder is divided into narrow chamber and wide chamber by peripheral shoulder, piston of smaller diameter than narrow chamber being mounted in slide which fits closely in wider chamber
CN102829019A (en) * 2012-09-06 2012-12-19 临沂金利液压科技有限公司 High-performance hydraulic cylinder with oil distribution device

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