EP0684391B1 - Druckmittelbetätigbarer Arbeitszylinder - Google Patents
Druckmittelbetätigbarer Arbeitszylinder Download PDFInfo
- Publication number
- EP0684391B1 EP0684391B1 EP95105000A EP95105000A EP0684391B1 EP 0684391 B1 EP0684391 B1 EP 0684391B1 EP 95105000 A EP95105000 A EP 95105000A EP 95105000 A EP95105000 A EP 95105000A EP 0684391 B1 EP0684391 B1 EP 0684391B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- piston
- cushioning
- bushing
- cylinder
- piston rod
- 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
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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
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/22—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke
- F15B15/222—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke having a piston with a piston extension or piston recess which throttles the main fluid outlet as the piston approaches its end position
Definitions
- the invention is based on a pressure medium actuable Working cylinder according to the preamble of claim 1 specified genus.
- FR 24 79 389 A also includes a working cylinder Throttle device known in which a throttle bushing is fixed on the piston rod between a piston and a Piston rod section is clamped. On their outer The throttle bushing carries the entire surface area throttle grooves extending axially through their variable cross-section a progressive damping allow.
- the damping bushing cannot be used here Check valve work so that as a result of Damping device no quick return stroke is possible.
- the one fixed on the piston rod must Damping bush exactly on the housing side Passage opening in the cylinder head can be matched what construction costs increased.
- DE 34 45 481 A1 also includes a working cylinder a damping device for a longitudinally movable guided and attached to a piston rod known to brake the piston when reaching an end position a damping bush between one Piston rod section and the piston is fixedly mounted into a suitable opening in the cylinder head can immerse to the unimpeded outflow of pressure medium from a cylinder chamber adjacent to the piston throttle or interrupt. Pressure medium can then only via a parallel connection with throttle screw flow to the cylinder connection. To the next Return stroke of the piston from its end position is sufficient large pressure medium flow the flow into the cylinder chamber To enable is in the damping bush plate-like check valve installed, which in one line connecting both sides of the damping bush axially and radially extending channels.
- the working cylinder according to the invention with the characteristic Features of claim 1 has the advantage that he high damping effect with simpler and cheaper Construction achieved.
- the working cylinder with Damping device comes with only a few parts and is also easy to manufacture. Furthermore, the Damping device from a rapid leakage of the piston its end position, so that relatively high Working speeds can be achieved with the working cylinder are. Furthermore, the damping device works relatively soft and avoids pressure surges, which too an unfavorable material load and thus one can lead to low lifespan.
- FIG. 1 shows a longitudinal section through a Part of a pressure-operated cylinder
- Figure 2 shows a partial section through the working cylinder Figure 1 in another working position, in which the Damping bush works as a check valve.
- FIG. 1 shows a part of a pressure-medium-actuatable Working cylinder 10 in a half section, in which a Cylinder tube 11 with a cylinder cover 12 and one not a cylinder space 13 include in which a piston 14 is slidably guided.
- the piston 14 is placed on a multiple Piston rod 15 attached via a in the cylinder cover arranged sealing sleeve 16 leads to the outside.
- An annular space 17 is formed in the cylinder cover 12, the one in the radial direction with a cylinder connection 18th Has connection and in the axial direction via a annular passage opening 19 with a cylinder chamber 21, which is connected by the piston 14 in the cylinder space 13 is separated and from the piston 14 and the Cylinder cover 12 is limited.
- the damping bushing 22 is essentially sleeve-shaped trained, their axial length about their Outer diameter corresponds and in particular a multiple their wall thickness is.
- the damping bushing 22 has one first end face 29, which corresponds to the first stop 23 is facing and together with that as a valve seat working first annular shoulder 25 forms a seat valve 31, so that the damping bush 22 work as a check valve can.
- the damping bushing 22 is on the first end face 29 chamfered on the outside to prevent the damping bushing 22 from breaking in to facilitate the passage opening 19. From the first End face 29 proceeding in the outer Shell surface 32 several throttle grooves 30, which are even are distributed along the circumference, in the axial direction run and near the other, second end face 33 of the Damping bushing 22 ends.
- the damping bushing 22 is therefore part of a Damping device 38 in the cylinder 10, the Piston 10 a damped entry into its end position enables and on the other hand as fast as possible Permitted to run out of its end position.
- One from Piston 14 and the cylinder bottom, not shown limited, second cylinder chamber is designated 39.
- the operation of the working cylinder 10 is as follows explained, mainly on the function of Damping device 38 is received.
- Pressure medium from the first cylinder chamber 21 can only throttled via the throttle grooves 30 to the cylinder connection 18th flow out.
- throttle grooves 30 progressive damping can be achieved.
- the relatively large radial play between the damping bushing 22 and Piston rod 15 allows a tight fit in the Passage opening 19 so that good damping values can be achieved are without the damping bush 22 tends to block.
- FIG. 2 now shows in the partial longitudinal section of the Working cylinder 10 the facts when the piston 14 out an end position and thereby the function of Damping device 38 through the now as a check valve working damping bushing 22 is largely canceled to to achieve a quick extension.
- the Cylinder port 18 pressurized in the Annulus 17 on the first end face 29 of the damping bush 22 acts. Due to the somewhat lower pressure level in the The first cylinder chamber 21, the damping bush 22 with its second end face 33 against the second stop 24 on Piston 14 pushed, whereby the seat valve 31 opens.
- the damping device 38 By designing the damping device 38 with a only moving part, namely the damping bushing 22, can be a particularly effective and shock-free damping simple means.
- the Damping bushing 22 By training the Damping bushing 22 as a movable seat valve member on which additionally the throttle grooves 30 and the pressure medium connection 35 are arranged, one can be particularly simple and inexpensive damping device to reach.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Damping Devices (AREA)
- Actuator (AREA)
Description
Claims (7)
- Druckmittelbetätigbarer Arbeitszylinder (10) mit in einem Zylinderraum (13) geführten Kolben (14), der an einer Kolbenstange (15) befestigt und in dem Zylinderraum (13) zwischen zwei Endstellungen verschiebbar ist und mit einer Dämpfungseinrichtung zum Abbremsen des Kolbens (14) bei seiner Bewegung in eine Endstellung, wobei eine auf der Kolbenstange (15) angeordnete Dämpfungsbuchse (22) in eine Durchtrittsöffnung (19) eintaucht und einen gedrosselten Abfluß von Druckmittel aus einer vom Kolben (14) begrenzten Zylinderkammer (21) zu einem Zylinderanschluß (18) für ein langsames Einlaufen des Kolbens (14) in seine Endstellung bewirkt und mit einem der Dämpfungseinrichtung zugeordneten Rückschlagventil (31), das eine ungehinderte Druckbeaufschlagung dieser Zylinderkammer (21) vom Zylinderanschluß (18) aus für ein schnelles Auslaufen des Kolbens (14) aus seiner Endstellung ermöglicht, wobei die Dämpfungsbuchse (22) auf der Kolbenstange (15) zwischen zwei kolbenstangenseitigen Anschlägen (23, 24) axial frei beweglich geführt ist und ein Ende (29) der Dämpfungsbuchse (22) an dem der Durchtrittsöffnung (19) zugeordneten Anschlag (23) das Ventil (31) bildet, das die Funktion des Rückschlagventils übernimmt, wobei die Dämpfungsbuchse (22) hülsenförmig ausgebildet ist und deren eine Stirnseite (29) mit dem kolbenstangenseitigen Anschlag (23) ein Sitzventil (31) bildet und bei dem die von dem Rückschlagventil (31) gesteuerte, zwischen beiden Stirnseiten (29, 33) der Dämpfungsbuchse (22) verlaufende Druckmittelverbindung (35) in der Dämpfungsbuchse (22) angeordnet ist, dadurch gekennzeichnet, daß die Dämpfungsbuchse (22) an ihrer äußeren Mantelfläche (32) über deren Länge sich erstreckende Drosselnuten (30) aufweist, die für eine progressive Dämpfung ausgebildet sind, und daß die Druckmittelverbindung (35) zwischen beiden Stirnseiten (29, 33) der Dämpfungsbuchse (22) in deren Innenwand (37) angeordnet ist, welche unmittelbar auf der Kolbenstange (15) geführt ist.
- Arbeitszylinder nach Anspruch 1, dadurch gekennzeichnet, daß die Druckmittel-Verbindung (35) durch schraubenförmig verlaufende Rillen (36) in der Innenwand (37) der Dämpfungsbuchse (22) gebildet ist.
- Arbeitszylinder nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Dämpfungsbuchse (22) mit relativ großem radialen Spiel auf der Kolbenstange (15) geführt ist.
- Arbeitszylinder nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Kolbenstange (15) über eine Ringschulter (25) in einen Führungsabschnitt (26) mit kleinerem Durchmesser übergeht, auf dem die Dämpfungsbuchse (22) geführt ist und daß diese Ringschulter (25) als Ventilsitz und als Anschlag (23) dient.
- Arbeitszylinder nach Anspruch 4, dadurch gekennzeichnet, daß der Führungsabschnitt (26) über eine zweite Ringschulter (27) in einen Stangenabschnitt (28) übergeht, auf dem der Kolben (14) angeordnet ist, der seinerseits den zweiten Anschlag (24) für die Dämpfungsbuchse (22) bildet.
- Arbeitszylinder nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Durchtrittsöffnung (19) in einem Zylinderkopf (12) angeordnet ist und deren Durchmesser auf den Außendurchmesser der Dämpfungsbuchse (22) abgestimmt ist, insbesondere ein enges Spiel aufweist.
- Arbeitszylinder nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die hülsenförmige Dämpfungsbuchse (22) gleich große Stirnseiten (29, 33) aufweist, und ihre axiale Länge etwa ihrem Außendurchmesser entspricht, insbesondere ein Vielfaches der Wandstärke der Dämpfungsbuchse (22) beträgt.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4414485A DE4414485A1 (de) | 1994-04-26 | 1994-04-26 | Druckmittelbetätigbarer Arbeitszylinder |
DE4414485 | 1994-04-26 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0684391A1 EP0684391A1 (de) | 1995-11-29 |
EP0684391B1 true EP0684391B1 (de) | 1999-12-08 |
Family
ID=6516445
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95105000A Expired - Lifetime EP0684391B1 (de) | 1994-04-26 | 1995-04-04 | Druckmittelbetätigbarer Arbeitszylinder |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0684391B1 (de) |
DE (2) | DE4414485A1 (de) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19635876C2 (de) * | 1996-09-04 | 2001-04-05 | Orenstein & Koppel Ag | Ringseitige Dämpfung an druckmittelbetätigten Arbeitszylindern |
DE29618186U1 (de) * | 1996-10-21 | 1998-02-19 | Robert Bosch Gmbh, 70469 Stuttgart | Druckmittelbetätigbarer Arbeitszylinder |
AT406292B (de) * | 1998-07-22 | 2000-03-27 | Hainzl Industriesysteme Ges M | Vorrichtung zum abbremsen eines kolbens eines hydraulikzylinders |
KR100652872B1 (ko) * | 2005-01-03 | 2006-12-01 | 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 | 실린더 쿠션장치 |
DE102010024505A1 (de) * | 2010-06-21 | 2011-12-22 | Pacoma Gmbh | Endlagengedämpfter Druckmittelzylinder |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2433662A1 (fr) * | 1978-08-18 | 1980-03-14 | Outillage Air Comprime | Clapet a bille |
US4424737A (en) * | 1980-03-26 | 1984-01-10 | Kabushiki Kaisha Komatsu Seisakusho | Stroke cushioning apparatus for hydraulic cylinders |
DE3445481A1 (de) * | 1983-12-16 | 1985-06-27 | E.A. Storz Gmbh & Co Kg, 7200 Tuttlingen | Hydraulikzylinderaggregat |
GB9225925D0 (en) * | 1992-12-11 | 1993-02-03 | Parker Hannifin Plc | Improvements relating to cylinders |
-
1994
- 1994-04-26 DE DE4414485A patent/DE4414485A1/de not_active Withdrawn
-
1995
- 1995-04-04 DE DE59507364T patent/DE59507364D1/de not_active Expired - Lifetime
- 1995-04-04 EP EP95105000A patent/EP0684391B1/de not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
Firmenschrift 'Marrel Hydro Catalogue 11085F - 11/79', Seiten 1-7 * |
Also Published As
Publication number | Publication date |
---|---|
DE59507364D1 (de) | 2000-01-13 |
EP0684391A1 (de) | 1995-11-29 |
DE4414485A1 (de) | 1995-11-02 |
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