EP0764241B1 - Hydraulic power cylinder - Google Patents
Hydraulic power cylinder Download PDFInfo
- Publication number
- EP0764241B1 EP0764241B1 EP95920904A EP95920904A EP0764241B1 EP 0764241 B1 EP0764241 B1 EP 0764241B1 EP 95920904 A EP95920904 A EP 95920904A EP 95920904 A EP95920904 A EP 95920904A EP 0764241 B1 EP0764241 B1 EP 0764241B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- ring
- working cylinder
- channel
- piston
- hydraulic working
- 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.)
- Expired - Lifetime
Links
Images
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
- F15B15/149—Fluid interconnections, e.g. fluid connectors, passages
-
- 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
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/044—Removal or measurement of undissolved gas, e.g. de-aeration, venting or bleeding
Definitions
- the invention relates to a hydraulic working cylinder with a piston, the piston rod with an adjusting device connected is.
- the piston divides the Working cylinders in alternately pressurizable pressure rooms. In the pressure rooms have line connections for the supply line of the pressure oil.
- the invention has for its object a device to create that even at the working cylinder below attached pipe connections a constant self-venting enables. This requirement is said to be without enlargement the steering with little additional effort to let.
- the channel of the ring is U-shaped and open on the outside diameter, the channel extends over the entire circumference of the ring.
- the ring open to the outside can also only run over part of the circumference.
- the Ring channel can be easily incorporated and its small Length ensures you at a high flow rate rapid removal of the pressure medium with the enclosed Air.
- the ring can also be variant with a stiffening bar be connected to an axial seal. The ring is then advantageous molded in one piece on the stiffening web. This Execution has the advantage of joint installation of the Axial seal with the ring and easier storage.
- the ring can also by a snap connection in the stiffening ring of the Attach the axial seal.
- FIG. 1 and 2 show a working cylinder 1 with continuous piston rod 2, which carries a piston 3.
- Piston 3 is drawn in its left end position. He divides the working cylinder 1 into a pressure chamber 4 and 5.
- the arrangement according to the invention is on both line connections applicable, but for simplicity only one line connection 6 for the supply or discharge of the Drawn pressure medium.
- the piston 3 contains a seal 8. Since the seal 8 of the Piston 3 does not have a bore 6A in the line connection 6 is a space around the hole 6A for the Stroke of the piston 3 cannot be used. According to the invention is in this space, which is in the cross-sectional plane of the pipe connection lies, a ring 10 inserted.
- This ring 10 can for example by an indentation 11 of the working cylinder 1 be fixed in a notch 12.
- the ring 10 has one U-shaped channel 13, which is partially or entirely Scope can run. It is essential that an inlet opening 14 in the pressure chamber 4 at the highest point of the ring 10 is provided. This inlet opening 14 protrudes the channel 13 with the line connection 6 in connection.
- the arrangement according to the invention ensures that a Always remove the pressure medium at the highest point of the Working cylinder 1 takes place. In the relatively narrow Cross section of the channel 13 is the flow rate so high that the air is swept down.
- FIG. 3 shows a further embodiment with a Axial seal 15 for a piston rod 16.
- This axial seal 15 has a stiffening ring 17, on which a ring 20 connected to the line connection 18 is integrally formed is.
- This ring 20 also has an inlet opening 21.
- a ring 22 can also be used a snap connection 23 into a stiffening ring 24 attach an axial seal 25.
Description
Die Erfindung betrifft einen hydraulischen Arbeitszylinder mit einem Kolben, dessen Kolbenstange mit einer Verstelleinrichtung verbunden ist. Der Kolben unterteilt den Arbeitszylinder in wechselnd beaufschlagbare Druckräume. In die Druckräume führen Leitungsanschlüsse für die Zuleitung des Drucköls.The invention relates to a hydraulic working cylinder with a piston, the piston rod with an adjusting device connected is. The piston divides the Working cylinders in alternately pressurizable pressure rooms. In the pressure rooms have line connections for the supply line of the pressure oil.
Diese Arbeitszylinder finden häufig Anwendung in Verbindung mit Zahnstangen-Hilfskraftlenkungen, in welchen die Kolbenstange einteilig mit der in ein Ritzel eingreifenden Zahnstange ausgeführt ist. Eine derartige Hilfskraftlenkeinrichtung ist beispielsweise aus der EP 0 544 086 A2 bekannt. Von einer solchen Lenkung, die mit einem in der Neutrallage geschlossenen Steuerventil arbeitet und deren Lenkungskreis einen Druckspeicher enthält, erwartet man einen hohen Wirkungsgrad. Der Konstrukteur muß darauf achten, daß die einem wechselnden Druck ausgesetzten Systembereiche eine gute Entlüftung aufweisen. Im Bereich zwischen der Steuerventil-Zulaufkante und dem Arbeitszylinder muß man die Elastizitäten möglichst klein halten, da das Druckmittelvolumen, welches man zum Auffüllen dieser Elastizitäten braucht, bei einer nachfolgenden Druckabsenkung ungenutzt in den Tank fließt. Eine häufige Ursache für diese Elastizitäten sind Lufteinschlüsse. Es ist daher wichtig, daß diese Hydraulikkreise ständig selbstentlüftend arbeiten. Bei Arbeitszylindern kann man eine Selbstentlüftung dadurch erreichen, daß man die Leitungsanschlüsse oben anordnet. Die eingeschlossene Luft wird dann bei einer Bewegung des Kolbens über die Leitungen zum Behälter ausgeschoben. Es ist jedoch aus Sicherheits- und Platzgründen oft nicht möglich, die Leitungsanschlüsse nach oben zu verlegen. Diese findet man deshalb oft unten oder seitlich. Eine seitliche Anordnung der Leitungsanschlüsse ist beispielsweise in der EP 0 518 922 B1 (Fig. 1 und 2) gezeigt.These cylinders are often used in conjunction with power assisted rack and pinion steering in which the Piston rod in one piece with the one engaging in a pinion Rack is running. Such an auxiliary steering device is known for example from EP 0 544 086 A2. From such a steering system with one in the neutral position closed control valve works and its steering circuit contains a pressure accumulator, one expects one high efficiency. The designer must ensure that the system areas exposed to changing pressure have good ventilation. In the area between the Control valve inlet edge and the working cylinder you have to keep the elasticities as low as possible, since the pressure medium volume, which one to fill up these elasticities needs, unused in a subsequent pressure drop flows into the tank. A common cause of these elasticities are air pockets. It is therefore important that these hydraulic circuits are constantly self-venting. In the case of working cylinders, this allows self-ventilation achieve that you arrange the line connections above. The trapped air is then when the Piston pushed out over the lines to the container. It is often not possible for security and space reasons, to lay the line connections upwards. This can therefore often be found below or to the side. A side The arrangement of the line connections is, for example, in the EP 0 518 922 B1 (FIGS. 1 and 2).
Der Erfindung liegt die Aufgabe zugrunde, eine Einrichtung zu schaffen, die auch bei am Arbeitszylinder unten angebrachten Leitungsanschlüssen eine ständige Selbstentlüftung ermöglicht. Diese Forderung soll sich ohne Vergrößerung der Lenkung mit geringem Mehraufwand verwirklichen lassen.The invention has for its object a device to create that even at the working cylinder below attached pipe connections a constant self-venting enables. This requirement is said to be without enlargement the steering with little additional effort to let.
Diese Aufgabe ist durch die Merkmale des Anspruches 1 gelöst. Vorteilhafte Weiterbildungen ergeben sich aus den Unteransprüchen 2 bis 5.This object is characterized by the features of claim 1 solved. Advantageous further developments result from the Subclaims 2 to 5.
Nach dem kennzeichnenden Merkmal des Anspruches 1 befindet sich in der Schnittebene der Leitungsanschlüsse im Arbeitszylinder jeweils ein Ring mit einem mit den Anschlüssen korrespondierenden Kanal. Dieser Kanal steht über eine Einlaßöffnung mit dem Druckraum in Verbindung. Hierzu gehört, daß die Einlaßöffnung an der höchsten Stelle des Arbeitszylinders liegt. Durch die Erfindung wird die sich an der höchsten Stelle des Arbeitszylinders ansammelnde Luft bei einer Bewegung des Kolbens mitgerissen und durch die Strömungsgeschwindigkeit über den Kanal und die Leitungen zum Tank transportiert. Über den Tankdeckel, der Entlüftungskanäle enthält, kann die Luft schließlich ins Freie gelangen.According to the characterizing feature of claim 1 in the cutting plane of the line connections in the working cylinder one ring each with one corresponding to the connections Channel. This channel stands over an inlet opening in connection with the pressure room. This includes that the inlet opening at the highest point of the working cylinder lies. The invention is the highest Place the air cylinder collecting air at one Movement of the piston entrained and by the flow velocity over the channel and the lines to the tank transported. Via the fuel cap, the ventilation channels contains, the air can finally get outside.
Nach Anspruch 2 ist der Kanal des Ringes U-förmig und am Außendurchmesser offen ausgeführt, wobei sich der Kanal über den gesamten Umfang des Ringes erstreckt.According to claim 2, the channel of the ring is U-shaped and open on the outside diameter, the channel extends over the entire circumference of the ring.
Nach Anspruch 3 kann der nach außen offene Ring auch nur über einen Teilbereich des Umfanges verlaufen. Der Ringkanal läßt sich einfach einarbeiten und seine geringe Länge sorgt bei hoher Strömungsgeschwindigkeit für einen schnellen Abtransport des Druckmittels mit der eingeschlossenen Luft. Nach einer in den Ansprüchen 4 und 5 enthaltenen Variante kann der Ring auch mit einem Versteifungssteg einer Axialdichtung verbunden sein. Der Ring ist dann vorteilhaft einstückig an den Versteifungssteg angeformt. Diese Ausführung hat den Vorteil des gemeinsamen Einbaues der Axialdichtung mit dem Ring und der einfacheren Lagerhaltung.According to claim 3, the ring open to the outside can also only run over part of the circumference. Of the Ring channel can be easily incorporated and its small Length ensures you at a high flow rate rapid removal of the pressure medium with the enclosed Air. According to one contained in claims 4 and 5 The ring can also be variant with a stiffening bar be connected to an axial seal. The ring is then advantageous molded in one piece on the stiffening web. This Execution has the advantage of joint installation of the Axial seal with the ring and easier storage.
Nach Anspruch 5 schließlich läßt sich der Ring auch durch eine Schnappverbindung in den Versteifungsring der Axialdichtung einhängen.Finally, according to claim 5, the ring can also by a snap connection in the stiffening ring of the Attach the axial seal.
Die Erfindung ist anhand von zwei in der Zeichnung dargestellten Ausführungsbeispielen näher erläutert. Es zeigen:
- Fig. 1
- einen Teil-Längsschnitt durch einen Arbeitszylinder;
- Fig. 2
- einen Querschnitt nach der Linie II-II in Fig. 1 und
- Fig. 3 + Fig. 3A
- weitere Teil-Längsschnitte durch andere Ausführungsformen.
- Fig. 1
- a partial longitudinal section through a working cylinder;
- Fig. 2
- a cross section along the line II-II in Fig. 1 and
- Fig. 3 + Fig. 3A
- further partial longitudinal sections through other embodiments.
Die Fig. 1 und 2 zeigen einen Arbeitszylinder 1 mit
durchgehender Kolbenstange 2, die einen Kolben 3 trägt. Der
Kolben 3 ist in seiner linken Endstellung gezeichnet. Er
unterteilt den Arbeitszylinder 1 in einen Druckraum 4
und 5. Die erfindungsgemäße Anordnung ist an beiden Leitungsanschlüssen
anwendbar, der Einfachheit wegen ist jedoch
nur ein Leitungsanschluß 6 für die Zu- bzw. Abfuhr des
Druckmittels gezeichnet. Auf der einen Seite des Leitungsanschlusses
6 ist eine Axialdichtung 7 eingesetzt. Außerdem
enthält der Kolben 3 eine Dichtung 8. Da die Dichtung 8 des
Kolbens 3 eine Bohrung 6A des Leitungsanschlusses 6 nicht
unterfahren darf, ist ein Raum um die Bohrung 6A für den
Hub des Kolbens 3 nicht nutzbar. Nach der Erfindung ist in
diesem Raum, der in der Querschnittsebene des Leitungsanschlusses
liegt, ein Ring 10 eingelegt. Dieser Ring 10 kann
zum Beispiel durch eine Eindrückung 11 des Arbeitszylinders
1 in eine Kerbe 12 fixiert sein. Der Ring 10 hat einen
U-förmigen Kanal 13, der teilweise oder über den gesamten
Umfang verlaufen kann. Wesentlich ist, daß eine Einlaßöffnung
14 in den Druckraum 4 an der höchsten Stelle des Ringes
10 vorgesehen ist. Diese Einlaßöffnung 14 steht über
den Kanal 13 mit dem Leitungsanschluß 6 in Verbindung.
Durch die erfindungsgemäße Anordnung erreicht man, daß eine
Druckmittelentnahme immer an der höchsten Stelle des
Arbeitszylinders 1 erfolgt. In dem verhältnismäßig engen
Querschnitt des Kanals 13 ist die Strömungsgeschwindigkeit
so hoch, daß die Luft nach unten mitgerissen wird.1 and 2 show a working cylinder 1 with
continuous piston rod 2, which carries a piston 3. Of the
Piston 3 is drawn in its left end position. He
divides the working cylinder 1 into a pressure chamber 4
and 5. The arrangement according to the invention is on both line connections
applicable, but for simplicity
only one line connection 6 for the supply or discharge of the
Drawn pressure medium. On one side of the line connection
6, an axial seal 7 is used. Furthermore
The piston 3 contains a
Die Fig. 3 zeigt eine weitere Ausführung mit einer
Axialdichtung 15 für eine Kolbenstange 16. Diese Axialdichtung
15 weist einen Versteifungsring 17 auf, an welchem ein
mit dem Leitungsanschluß 18 verbundener Ring 20 angeformt
ist. Auch dieser Ring 20 weist eine Einlaßöffnung 21 auf.3 shows a further embodiment with a
Wie die Fig 3A zeigt, läßt sich ein Ring 22 auch mit
einer Schnappverbindung 23 in einen Versteifungsring 24
einer Axialdichtung 25 einhängen. As FIG. 3A shows, a
- 11
- ArbeitszylinderWorking cylinder
- 22nd
- KolbenstangePiston rod
- 33rd
- Kolbenpiston
- 44th
- DruckraumPressure room
- 55
- DruckraumPressure room
- 66
- LeitungsanschlußLine connection
- 6A6A
- Bohrungdrilling
- 77
- AxialdichtungAxial seal
- 88th
- Dichtungpoetry
- 99
- --
- 1010th
- Ringring
- 1111
- Eindrückung an 1Indentation at 1st
- 1212th
- Kerbe an 10Score at 10
- 1313
- Kanalchannel
- 1414
- EinlaßöffnungInlet opening
- 1515
- AxialdichtungAxial seal
- 1616
- KolbenstangePiston rod
- 1717th
- VersteifungsringStiffening ring
- 1818th
- LeitungsanschlußLine connection
- 1919th
- --
- 2020th
- Ringring
- 2121
- EinlaßöffnungInlet opening
- 2222
- Ringring
- 2323
- SchnappverbindungSnap connection
- 2424th
- VersteifungsringStiffening ring
Claims (6)
- Hydraulic working cylinder having the following features:disposed displaceably in the working cylinder (1) is a piston (3) with a piston rod (2; 16) connected to an adjusting device;the piston (3) subdivides the working cylinder (1) into pressure chambers (4, 5) which may be alternately pressurized;leading into the pressure chambers (4, 5) are in each case line connections (6; 18) for the supply and discharge of a pressure medium,situated in the working cylinder (1) in the cutting plane of the respective line connection (6; 18) is in each case a ring (10; 20; 22) having a channel (13) corresponding to the connection;the channel (13) is connected by an inlet opening (14; 21) to the respective pressure chamber (4, 5) andthe inlet opening (14; 21) lies at the highest point of the working cylinder (1).
- Hydraulic working cylinder according to claim 1, characterized in that the channel (13) in the ring (10) is U-shaped and at the outside diameter is of an open construction and the channel (13) extends over the entire periphery of the ring (10).
- Hydraulic working cylinder according to claim 1, characterized in that the channel (13) is U-shaped and open at the outside diameter and extends over a subregion of the ring (10).
- Hydraulic working cylinder according to claim 1, characterized in that the ring (20; 22) is connected to a stiffening ring (17; 24) of an axial seal (15; 25).
- Hydraulic working cylinder according to claim 4, characterized in that the ring (20) is integrally formed on the stiffening ring (17).
- Hydraulic working cylinder according to claim 4, characterized in that the ring (22) is fitted by means of a snap connection (23) into the stiffening ring (24).
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4419213A DE4419213A1 (en) | 1994-06-01 | 1994-06-01 | Hydraulic actuating cylinder |
DE4419213 | 1994-06-01 | ||
PCT/EP1995/002020 WO1995033137A1 (en) | 1994-06-01 | 1995-05-26 | Hydraulic power cylinder |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0764241A1 EP0764241A1 (en) | 1997-03-26 |
EP0764241B1 true EP0764241B1 (en) | 1998-04-01 |
Family
ID=6519563
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95920904A Expired - Lifetime EP0764241B1 (en) | 1994-06-01 | 1995-05-26 | Hydraulic power cylinder |
Country Status (6)
Country | Link |
---|---|
US (1) | US5697287A (en) |
EP (1) | EP0764241B1 (en) |
JP (1) | JP3576559B2 (en) |
BR (1) | BR9507807A (en) |
DE (2) | DE4419213A1 (en) |
WO (1) | WO1995033137A1 (en) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19543593A1 (en) * | 1995-11-23 | 1997-05-28 | Wabco Gmbh | Working cylinder |
IT1284830B1 (en) * | 1996-09-27 | 1998-05-22 | New Holland Italia Spa | HYDRAULIC JACK. |
US6004117A (en) * | 1998-05-29 | 1999-12-21 | Qualicon Inc. | Displacement pump |
DE10151930B4 (en) * | 2001-10-20 | 2011-02-24 | Audi Ag | venting device |
DE10314242A1 (en) * | 2003-03-29 | 2004-11-18 | Zf Lenksysteme Gmbh | servo cylinder |
DE102004063120A1 (en) * | 2004-12-22 | 2006-07-13 | Thyssenkrupp Presta Steertec Gmbh | Housing for a hydraulic steering system |
US20080092683A1 (en) * | 2005-10-17 | 2008-04-24 | Spetz John W | Venturi passageway for a steering assembly |
DE102006030125A1 (en) * | 2006-06-28 | 2008-01-17 | Thyssenkrupp Presta Steertec Gmbh | Bleeding a hydraulic steering system |
US20110072962A1 (en) * | 2009-09-30 | 2011-03-31 | Control Solutions, LLC | Self-bleeding double action hydraulic cylinder |
CN102878149B (en) * | 2012-10-23 | 2015-09-23 | 湖南特力液压有限公司 | Sealing mounting structure and Sealing installation method |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2937502A (en) * | 1959-04-13 | 1960-05-24 | Roy E Kenyon | Equalizing means for hydraulic brake system |
DE2406565C3 (en) * | 1974-02-12 | 1978-03-23 | Zahnradfabrik Friedrichshafen Ag, 7990 Friedrichshafen | Hydraulic power steering, in particular for motor vehicles |
JPS55135211A (en) * | 1979-04-10 | 1980-10-21 | Aisin Seiki Co Ltd | Air-bleeder for hydraulic cylinder |
GB2074271B (en) * | 1980-04-19 | 1984-06-27 | Lucas Industries Ltd | Bleeding hydraulic pressure cylinders |
DE3635020C2 (en) * | 1985-10-26 | 1994-08-04 | Volkswagen Ag | Form-fitting fastening of a circular cylindrical stop disc under axial force in a cylinder |
DE4139085A1 (en) * | 1991-11-28 | 1993-06-03 | Bosch Gmbh Robert | HYDRAULIC AUXILIARY STEERING DEVICE FOR MOTOR VEHICLES |
DE9201972U1 (en) * | 1992-02-15 | 1993-06-17 | Hydraulik Techniek, Emmen, Nl | |
US5390586A (en) * | 1994-03-28 | 1995-02-21 | Jones; Peter D. | Self-bleeding hydraulic cylinder |
-
1994
- 1994-06-01 DE DE4419213A patent/DE4419213A1/en not_active Withdrawn
-
1995
- 1995-05-26 WO PCT/EP1995/002020 patent/WO1995033137A1/en active IP Right Grant
- 1995-05-26 EP EP95920904A patent/EP0764241B1/en not_active Expired - Lifetime
- 1995-05-26 DE DE59501785T patent/DE59501785D1/en not_active Expired - Lifetime
- 1995-05-26 JP JP50030296A patent/JP3576559B2/en not_active Expired - Fee Related
- 1995-05-26 US US08/737,785 patent/US5697287A/en not_active Expired - Fee Related
- 1995-05-26 BR BR9507807A patent/BR9507807A/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
WO1995033137A1 (en) | 1995-12-07 |
DE59501785D1 (en) | 1998-05-07 |
BR9507807A (en) | 1997-09-16 |
JP3576559B2 (en) | 2004-10-13 |
JPH10500759A (en) | 1998-01-20 |
DE4419213A1 (en) | 1995-12-07 |
EP0764241A1 (en) | 1997-03-26 |
US5697287A (en) | 1997-12-16 |
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