EP2792890A1 - Vérin à piston plongeur amorti par sections - Google Patents

Vérin à piston plongeur amorti par sections Download PDF

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Publication number
EP2792890A1
EP2792890A1 EP14001297.2A EP14001297A EP2792890A1 EP 2792890 A1 EP2792890 A1 EP 2792890A1 EP 14001297 A EP14001297 A EP 14001297A EP 2792890 A1 EP2792890 A1 EP 2792890A1
Authority
EP
European Patent Office
Prior art keywords
piston
pressure medium
pressure
channel
plunger cylinder
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Withdrawn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
EP14001297.2A
Other languages
German (de)
English (en)
Inventor
Büter Josef
Dipl.-Ing., (FH) Ludger Rüther
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.)
Buemach Engineering International BV
Original Assignee
Buemach Engineering International BV
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 Buemach Engineering International BV filed Critical Buemach Engineering International BV
Publication of EP2792890A1 publication Critical patent/EP2792890A1/fr
Withdrawn legal-status Critical Current

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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
    • F15B15/224—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke having a piston which closes off fluid outlets in the cylinder bore by its own movement

Definitions

  • the invention relates to a plunger cylinder, as a single-acting cylinder, with a hubabitestician attenuation.
  • a cylinder with damping is for example in block letters DE 28 30 416 A1 discloses, wherein the working cylinder in a portion of the cylinder tube wall has a tapered channel, via which a pressure medium from the piston rod space can flow only throttled when the piston moves in the region of its end position on the corresponding portion of the cylinder tube wall.
  • Another working cylinder is from publication DE 199 52 375 A1 as a double-acting pneumatic cylinder of a device for applying adhesive labels on packaged goods known.
  • the pneumatic cylinder also has a piston unit, consisting of a piston and a piston rod, which is braked near its end positions.
  • the piston rod chamber is acted upon retraction of the piston unit with pressure, wherein the pressure medium flows from the piston chamber via a first port, which is located in front of the end position of the piston.
  • connection is closed by the piston, so that the pressure medium can only flow throttled over a, arranged in the bottom closure part of the pneumatic cylinder, damping unit.
  • the object of the present invention is therefore to provide a plunger cylinder with a section damping of a piston unit, wherein the damping acts between the respective end positions of the piston unit and wherein the plunger cylinder is simple and inexpensive to produce.
  • An inventive, partially damped plunger cylinder also referred to below as a plunger cylinder, has a cylinder tube with a bottom closure part and a guide closure part and with a pressure medium connection and a pressure chamber, wherein from the pressure chamber, a pressure medium can be received, which can be introduced via the pressure medium connection in the pressure chamber.
  • the bottom closure part and the guide closure part can be designed both as separate components, which are connected to the cylinder tube by a suitable pressure-sealing connection method, or as integral components of the cylinder tube.
  • the plunger cylinder according to the invention further comprises a piston unit, which is axially guided in the cylinder tube.
  • the piston unit has a piston and a piston rod, wherein both elements are connected to each other or may optionally be formed in one piece and being separated by the piston of the pressure chamber of the cylinder tube in a first working space and a second working space.
  • the first working space is a piston space
  • the second working space is a piston rod space.
  • the piston unit according to the invention has a connection channel through which the two working chambers of the plunger cylinder are pressure-connected.
  • the connecting channel represents a component of the pressure chamber and, in this connection, causes the pressure medium to move from the piston chamber into the piston rod chamber when the piston unit is extended or retracted. or from the piston rod space in the piston chamber, can flow.
  • the connecting channel can be formed for example by an axial and a radial bore in the piston rod, which engage at their ends within the piston rod.
  • the plunger cylinder according to the invention is characterized in that, for the first, the pressure medium connection is arranged in a region between a first and a second end position of the piston unit on the cylinder tube and the second of the pressure medium connection hubabitestagen by the piston can be covered.
  • a Hubab4.000iki coverage of the pressure medium connection is always here when the piston passes during the extension or retraction at a certain stroke of the piston unit, the pressure medium connection.
  • the invention makes it possible to adapt the damping characteristic of a plunger cylinder according to the invention in such a way that the pressure medium connection, in the region of the damping takes place in the respective position on the cylinder tube, in which the damping of the piston unit during the stroke is desired.
  • the invention provides that the piston of the plunger cylinder has a piston circulation channel, which is formed by two axially spaced and circumferentially formed boundaries.
  • a piston circulation channel which is formed by two axially spaced and circumferentially formed boundaries.
  • the pressure medium connection is the pressure medium, with an extending stroke of the piston unit and a consequent overlap of the pressure medium connection by the piston in the area between the two circulating boundaries introduced into the piston circulation channel and discharged at a retraction of the piston via the piston circulation passage in the pressure medium connection.
  • the pressure medium escapes via the boundaries, which for this purpose have an adapted outer diameter relative to the inner diameter of the cylinder tube.
  • an effective damping distance of the piston unit is defined by the distance of the boundaries from each other.
  • the throttle gap can be formed in various ways by the limitations in this context. On the one hand, it is possible, for example, to choose the outer diameter of the boundaries so that a defined gap is established between them and the cylinder tube, which acts as a throttle gap. The attenuation intensity is determined in this case by the, between the boundaries and the cylinder tube adjusting gap.
  • the outer diameter of the boundaries can be chosen so that the boundaries rest against the cylinder tube. In this case, for example, be provided in the boundaries of a radial gap, which acts as a throttle gap.
  • the limitations advantageously fulfill a dual function in that they are the first space forming for the piston circulation channel and second, that they limit the fluid flow by means of throttle gap.
  • the provision of the throttle gap allows the variant shown here particularly advantageous that the axially spaced boundaries are either identical and so the throttle gap is provided by both limitations or that the boundaries are different and so, for example, the throttle gap only between a limit and the cylinder tube is formed. In both cases, in the field of
  • At least one of the fluid flow throttling boundaries of the piston circulation channel is formed by a piston ring.
  • the particular advantage of the piston ring is due in particular to the low procurement costs and its presence as a separate component, which makes it possible for the piston ring to be replaced when a defined wear limit or damage is reached.
  • the damping intensity can be set almost arbitrarily with the least effort. It is also possible to change the gap to the cylinder inner diameter and thus the damping intensity only by replacing a piston ring against a piston ring with a different outer diameter.
  • the piston has a radial gap, also referred to below as a piston ring gap.
  • This radial gap of the piston ring forms in this context the effective throttle gap of the plunger cylinder.
  • the particular technological advantage of the training listed here is in particular that the damping intensity of the plunger cylinder according to the invention can be adjusted by the choice of the width of the piston ring gap in a simple manner. It is possible to change the damping intensity only by replacing a piston ring against a piston ring with a different gap of the radial gap.
  • the piston has an annular groove from which the piston ring is received. This allows a simple and reliable positional determination of the piston rings in their function as a limit, so that the determination of the damping portion can also be done for a shorter section than would correspond to the total length of the piston. Manufacturing technology, therefore, the damping characteristics can be accurately adjusted without the dimensions of the piston, assuming a sufficient length, must be changed.
  • a further advantageous variant of the plunger cylinder according to the invention allows a damping exclusively in a retraction, while an undamped extension is feasible.
  • the piston unit has an overflow channel through which the piston circulation channel and the pressure chamber can be pressure-connected and through which the pressure medium can flow from the piston circulation channel into the pressure chamber, or vice versa, during a corresponding stroke movement of the piston unit.
  • the overflow channel has a connection assigned to the piston circulation channel and a connection assigned to the pressure chamber, in which connection the inlet or outflow regions of the overflow channel are referred to as connection.
  • connection of the overflow channel assigned to the piston circulation channel is presently arranged in the region of the annular groove receiving the piston ring.
  • the annular groove is formed wider than the piston ring in this case, so that the piston ring is axially displaceable in the annular groove.
  • An inventive axial displacement of the piston ring is present, with an overlap of the pressure medium connection by the piston, caused by the incoming or outflowing pressure medium and, thereby adjusting between the piston circulation channel and the adjacent pressure chamber, pressure difference.
  • the piston ring Upon retraction, the piston ring is thus axially in a piston recirculation passage facing position, and thus in the direction of the piston recirculation passage facing wall of the annular groove, and vice versa upon extension into a piston recirculation passage facing away from the position, and thus in the direction of a piston recirculation channel facing away from the wall groove postponed.
  • the piston ring is designed in such a way that, in a position facing the piston circulation channel, it obstructs the overflow channel and releases the overflow channel in a position averted from the piston circulation channel.
  • the overflow channel is in this case preferably dimensioned so that a sufficiently large amount of the pressure medium can be removed via this, so that upon extension the piston unit experiences no or only a negligible attenuation.
  • the solution allows attenuation exclusively in an extension, while a retraction is undamped feasible.
  • the piston unit also has an overflow channel through which the piston circulation channel and the pressure chamber can be pressure-connected.
  • a, the pressure chamber associated, connection of the overflow is arranged in the region of the annular groove of the piston, wherein the annular groove wider is formed as the piston ring, so that it is axially displaceable in the annular groove.
  • the piston ring in connection with the piston ring groove in the present variant is designed such that it releases the overflow channel in a position facing the piston circulation channel and blocks the overflow channel in a position facing away from the piston circulation channel.
  • the overflow is ideally designed so that a sufficiently large amount of the pressure medium can be removed via the overflow, so that when a retraction of the piston unit no or only a negligible attenuation occurs.
  • Fig. 1 shows a plunger cylinder according to the invention according to the features of claim 1.
  • the plunger cylinder has a cylinder tube 1 with a bottom closure part 2 and a guide closure part 3 and a pressure medium connection 4.
  • a pressure medium (not shown) is led into a pressure chamber 5 of the plunger cylinder or out of the pressure chamber 5 via the pressure medium connection 4.
  • the plunger cylinder further comprises a piston unit 6, consisting of a piston 7 and a piston rod 8, wherein both elements are firmly connected to each other.
  • the piston unit 6 is guided axially in the cylinder tube 1 by the guide closure part 3, wherein a sealing element 21 in the guide closure part 3 prevents the pressure medium from escaping from the second working space 10.
  • the piston 7 separates the pressure chamber 5 of the plunger cylinder according to the invention in a first working space 9 and a second working space 10, wherein the first working space 9 a piston chamber and the second working space 10 constitute a piston rod space.
  • the piston unit 6 has a connection channel 11 which, as part of the pressure chamber 5, press-connects the first working space 9 and the second working space 10 to one another.
  • the plunger cylinder according to the invention is characterized in that the pressure medium connection 4 is arranged in a region between a first and a second end position of the piston unit 6 on the cylinder tube 1 and that the pressure medium connection 4, as in Fig. 1 shown, hubabroughtagen by the piston 7 can be covered.
  • the outer diameter of the boundaries 14.1 and 14.2 is compared to the inner diameter of the cylinder tube 1 is particularly advantageously chosen so that in the hubabismetagen coverage of the pressure medium port 4th formed by the piston 7 between the boundaries 14 and the cylinder tube 1, a throttle gap 12.
  • This throttle gap 12 causes at the overlap of the pressure medium port 4 by the piston 7 according to the invention, that, by the pressure medium connection 4 in the pressure chamber 5, or from the pressure chamber 5 effluent pressure medium must flow through the throttle gap 12 mandatory and thus a throttling of Adjust existing pressure medium flow.
  • the piston 7 has a piston circulation channel 13 which is formed and bounded by two axially spaced boundaries 14.
  • the boundaries 14 are in the embodiment shown here before as integral components of the piston 7 and are provided for example by reworking of the piston 7 by means of turning.
  • the throttle gap 12 is formed by the boundaries 14, wherein the outer diameter of the boundaries 14 are selected so that between the boundaries 14 and the cylinder tube 1, a gap is established, which acts as a throttle gap 12.
  • the outer diameter of the boundaries 14 are matched to the inner diameter of the cylinder tube 1, that the boundaries 14 rest against the cylinder tube 1 and thus forms no gap between these elements.
  • the throttle gap 12 can be formed in this case, for example, by radial recesses (not shown) in the boundaries 14.
  • the pressure medium flows through the pressure medium connection 4 into the piston circulation passage 13 and out of the piston circulation passage 13 throttles through the throttle gap 12 into the pressure space 5.
  • the damping characteristic of a plunger cylinder according to the invention Fig. 1 is particularly easy adaptable by an offset arrangement of the pressure medium connection 4 to the respective application.
  • the remaining connection options are closed, for example by means of plugs.
  • the plunger cylinder according to the invention thus makes it possible to provide a selective damping in the region between the end positions of the piston unit 6 in the cylinder tube 1 in a particularly simple and at the same time cost-effective manner.
  • the embodiment of the plunger cylinder shown here has, inter alia, the technological advantage that regardless of the dimensions of the piston 7 by a specific application spacing of the boundaries 14 to each other a defined length of the attenuation path is provided.
  • the length of the damping gap is defined by the axial distance of the boundaries 14 to each other.
  • FIGS. 2a and 2 B A further embodiment of the plunger cylinder according to the invention with the features of claims 4 and 5 is in the FIGS. 2a and 2 B shown, in Fig. 2a an overlap of the pressure medium connection 4 by the piston 7 and in Fig. 2b an upper end position of the piston unit 6 in the cylinder tube 1 are shown.
  • the FIGS. 2a and 2 B differ only in the way the representation of the individual components of the plunger cylinder, the essential components themselves and the operation of the plunger cylinder are identical in both cases.
  • the boundaries of the piston recirculation channel 13 are formed by separate piston rings 15, which are arranged in corresponding annular grooves of the piston 7.
  • the piston rings 15 are formed in the outer diameters according to the invention so that they rest against the inner wall of the cylinder tube 1 and point, as in Fig. 6 shown, a radial gap 17. Consequently, in the present embodiment, the throttle gap 12 is formed by the radial gaps 17 of the piston rings 15.
  • the damping characteristics of the plunger cylinder can be adjusted by the choice of a suitable width of the radial column 17 in addition to the particular application and that on the other hand, the piston rings 15 are present as separate components and thus, for example upon reaching a wear limit or a defect, can be replaced without the piston 7 or the complete piston unit 6 must be replaced.
  • the connecting channel 11 can be provided for example by combining a radial and an axial bore in the piston rod.
  • a particularly advantageous embodiment of a plunger cylinder according to the invention with the features of claim 6 is in the Fig. 3a and 3b shown. It shows the Fig. 3a a retraction of the piston unit 6, whereas in Fig. 3b an extension of the piston unit 6 is shown. The directions of movement are each represented by the arrows. The sake of clarity is in the Fig. 3a and 3b only the relevant section of the plunger cylinder is shown in detail.
  • the piston 7 of a plunger cylinder according to the invention in addition to an overflow 18, through which, depending on the direction of movement of the piston unit 6, a complementary pressure connection between the pressure chamber 5 and the piston recirculation channel 13 is provided.
  • the piston-side piston ring 15.1 receiving, annular groove 16 is formed wider than the piston ring 15.1, so that the piston ring 15.1 in the annular groove 16 is axially displaceable. An axial displacement of the piston ring 15.1 in the annular groove 16 is effected in this context by the respective acting on the piston ring 15.1 back pressure of the pressure medium.
  • the overflow channel 18 is formed in the present embodiment so that it is blocked by the piston ring 15.1, in the piston recirculation passage 13 facing position and thus upon retraction of the piston unit 6. In this way, it is achieved that the pressure medium can flow out of the pressure chamber 5 in the piston circulation passage 13 and then into the pressure medium connection 4 during a retraction of the piston unit 6 only through the respective radial gaps 17 of the piston rings 15. Thus, when the piston unit 6 retracts, damping takes place in the region of the overlap of the pressure medium connection 4 by the piston 7.
  • the overflow channel 18 is further present in such a way that it is released by the piston ring 15.1, in the, the piston recirculation channel 13 facing away from position.
  • the release of the overflow channel 18 allows the pressure medium in an extension of the piston unit 6 an additional outflow from the piston circulation passage 13 in the first working space 9 and thus in the pressure chamber. 5
  • a correspondingly large amount of the pressure medium can thus freely flow out of the piston circulation channel 13, so that there is no or negligible throttling of the pressure medium flow and thus no damping of the piston unit 6 during an extension operation.
  • the embodiment shown here thus offers the particular advantage that the plunger cylinder selective damping of the piston unit 6 only during a retraction allows, whereas the extension process, at least as far as possible, undamped.
  • FIG. 4a and 4b Another embodiment of a plunger cylinder according to the invention is in the Fig. 4a and 4b illustrated, in which case the features of claim 7 are taken.
  • Fig. 4a is the overflow 18 according to the invention designed so that it is blocked by the piston ring 15.1, in a piston recirculation passage 13 facing away from the position. In this way, it is effected that, with an extension of the piston unit 6, the pressure medium from the piston circulation passage 13 can flow only through the radial gaps 17 in the first working space 9 and thus throttled the pressure medium flow and the extension of the piston unit 6 is attenuated.
  • the plunger cylinder according to the invention thus makes it possible, as a special technological advantage, depending on the design of the overflow channel 18, to provide a selective damping of the retraction or extension of the piston unit, without this experiencing a stroke-section damping in the respective other direction of movement.
  • the damping is in each case only in the region of the overlap of the pressure medium connection 4 by the piston 7 before.
  • the Fig. 5a and 5b each show special embodiments of the transfer port 18 as axially extending bores.
  • the bores are designed so that they at least partially engage in the annular groove 16.
  • the engagement region of the holes in the annular groove 16 is dimensioned such that this is either lockable or releasable by the piston ring 15.1, depending on the direction of movement of the piston unit 6.
EP14001297.2A 2013-04-18 2014-04-09 Vérin à piston plongeur amorti par sections Withdrawn EP2792890A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE201320003622 DE202013003622U1 (de) 2013-04-18 2013-04-18 Abschnittsgedämpfter Plungerzylinder

Publications (1)

Publication Number Publication Date
EP2792890A1 true EP2792890A1 (fr) 2014-10-22

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EP14001297.2A Withdrawn EP2792890A1 (fr) 2013-04-18 2014-04-09 Vérin à piston plongeur amorti par sections

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EP (1) EP2792890A1 (fr)
DE (1) DE202013003622U1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106382275A (zh) * 2016-11-23 2017-02-08 韶关市博仕乐液压机械制造有限公司 一种内置循环油路且带倾斜支撑盘的液压油缸
CN106382274A (zh) * 2016-11-23 2017-02-08 韶关市博仕乐液压机械制造有限公司 一种内置循环油路且带水平支撑盘的液压油缸
CN108757636A (zh) * 2018-09-10 2018-11-06 江阴市洪腾机械有限公司 一种中间部位进油的柱塞液压缸
EP3882135A1 (fr) * 2020-03-20 2021-09-22 Airbus Operations Limited Actionneur pour un ensemble trains d'atterrissage d'aéronef
US20220194564A1 (en) * 2019-08-30 2022-06-23 Airbus Operations Limited Hydraulic actuation system for an aircraft

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2587194A (en) * 2019-09-13 2021-03-24 Airbus Operations Ltd Landing gear system for an aircraft
DE102022002548A1 (de) 2022-07-12 2024-01-18 Günther Zimmer Feder-Dämpfer-System mit kolbenhubabhängigem Drosselrückschlagventil

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US3626812A (en) * 1970-07-09 1971-12-14 Bucyrus Erie Co Cylinder-cushioning arrangement
GB1363021A (en) * 1972-02-14 1974-08-14 Mangseth E Damping fluid-pressure operated cylinder and piston arrangements
DE2830416A1 (de) 1978-07-08 1980-01-17 Bell Ag Maschf Arbeitszylinder mit bremsfunktion
US4207800A (en) * 1978-11-02 1980-06-17 Homuth Kenneth C Single directional sealing piston ring
JPH0369305U (fr) * 1990-10-26 1991-07-10
EP0616882B1 (fr) 1993-03-23 1998-01-14 Leinhaas Umformtechnik GmbH Méthode de commande hydraulique d'une presse à levier articulée ou à genoullière et presse à levier articulée ou à genoullière avec un système de commande adapté à la mise en oeuvre de la méthode
DE19952375A1 (de) 1999-10-30 2001-05-10 Espera Werke Gmbh Vorrichtung zum Anbringen von Haftetiketten auf Warenpackungen

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DE29924653U1 (de) * 1998-11-06 2004-10-21 Smc Corp. Luftzylinder mit Dämpfungsmechanismus
DE20219451U1 (de) * 2002-12-13 2003-04-24 Trw Fahrwerksyst Gmbh & Co Hydraulikzylinder
DE10261412A1 (de) * 2002-12-30 2004-07-22 Bosch Rexroth Teknik Ab Pneumatikzylinder mit Dämpfungsmitteln
DE102005035633A1 (de) * 2004-07-31 2006-03-23 Zf Lenksysteme Gmbh Servomotor
DE102011105363A1 (de) * 2011-06-20 2012-12-20 Carl Freudenberg Kg Dichtring und Plungerzylinder damit

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1239948B (de) * 1959-06-30 1967-05-03 Stothert & Pitt Ltd Durch Druckmedium betaetigter, doppeltwirkender Druckzylinder
US3626812A (en) * 1970-07-09 1971-12-14 Bucyrus Erie Co Cylinder-cushioning arrangement
GB1363021A (en) * 1972-02-14 1974-08-14 Mangseth E Damping fluid-pressure operated cylinder and piston arrangements
DE2830416A1 (de) 1978-07-08 1980-01-17 Bell Ag Maschf Arbeitszylinder mit bremsfunktion
US4207800A (en) * 1978-11-02 1980-06-17 Homuth Kenneth C Single directional sealing piston ring
JPH0369305U (fr) * 1990-10-26 1991-07-10
EP0616882B1 (fr) 1993-03-23 1998-01-14 Leinhaas Umformtechnik GmbH Méthode de commande hydraulique d'une presse à levier articulée ou à genoullière et presse à levier articulée ou à genoullière avec un système de commande adapté à la mise en oeuvre de la méthode
DE19952375A1 (de) 1999-10-30 2001-05-10 Espera Werke Gmbh Vorrichtung zum Anbringen von Haftetiketten auf Warenpackungen

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106382275A (zh) * 2016-11-23 2017-02-08 韶关市博仕乐液压机械制造有限公司 一种内置循环油路且带倾斜支撑盘的液压油缸
CN106382274A (zh) * 2016-11-23 2017-02-08 韶关市博仕乐液压机械制造有限公司 一种内置循环油路且带水平支撑盘的液压油缸
CN108757636A (zh) * 2018-09-10 2018-11-06 江阴市洪腾机械有限公司 一种中间部位进油的柱塞液压缸
US20220194564A1 (en) * 2019-08-30 2022-06-23 Airbus Operations Limited Hydraulic actuation system for an aircraft
EP3882135A1 (fr) * 2020-03-20 2021-09-22 Airbus Operations Limited Actionneur pour un ensemble trains d'atterrissage d'aéronef
US11820495B2 (en) 2020-03-20 2023-11-21 Airbus Operations Limited Actuator for an aircraft landing gear assembly

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