EP1528266A1 - Joint d'étanchéité pour tube cylindrique et piston - Google Patents

Joint d'étanchéité pour tube cylindrique et piston Download PDF

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Publication number
EP1528266A1
EP1528266A1 EP04105496A EP04105496A EP1528266A1 EP 1528266 A1 EP1528266 A1 EP 1528266A1 EP 04105496 A EP04105496 A EP 04105496A EP 04105496 A EP04105496 A EP 04105496A EP 1528266 A1 EP1528266 A1 EP 1528266A1
Authority
EP
European Patent Office
Prior art keywords
sealing
damping element
piston rod
piston
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Withdrawn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
EP04105496A
Other languages
German (de)
English (en)
Inventor
Rudolf Möller
Jens Koch
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.)
Aventics GmbH
Original Assignee
Rexroth Mecman 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 Rexroth Mecman GmbH filed Critical Rexroth Mecman GmbH
Publication of EP1528266A1 publication Critical patent/EP1528266A1/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Withdrawn legal-status Critical Current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
    • F15B15/226—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke having elastic elements, e.g. springs, rubber pads
    • 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
    • F15B15/1433—End caps

Definitions

  • the present invention relates to a piston rod seal for a pressure cylinder with functionally integrated cushioning and a pressure medium cylinder with a inventive functionally integrated sealing-damping element.
  • a seal construction in which a Standard sealing element is used as a piston rod seal a pressure medium cylinder.
  • this standard sealing element also fulfills the task a scraping function for the piston rod.
  • the standard sealing element is here in one cup-shaped seal carrier fitted, in turn, with radial play in a cup-shaped recess of a cylinder cover is fitted, creating a for Piston stroke direction vertical freedom of movement of the piston rod is ensured.
  • the cylinder cover is in turn provided with a sealing ring arranged on the outside sealed against the cylinder of the pressure cylinder.
  • An end position damping is included
  • this construction is not intended. To this design a To realize cushioning, it would therefore be necessary a separate, special built-in elastomer molding in addition to the seal construction incorporate however, the unfavorable way to reduce the available working stroke space would.
  • Another piston rod seal is known for example from EP 1 306 561 A2, at also the sealing of the piston rod with respect to the cylinder via two separate Sealing rings takes place.
  • a first internal sealing ring seals the piston rod against an insert from between the Kolbestange and the cylinder inner wall is fitted.
  • the adjustable in stroke direction cylindrical insert is in turn via a sealed second outer sealing ring against the pressure medium cylinder.
  • a stop for the piston but here is one End position damping not shown.
  • a separate and special would have built-in elastomer molding can be installed, which in turn gives extra space would take.
  • a piston rod-cylinder unit shown for sealing the piston rod relative to the piston cylinder with a Guide body is equipped with a molded piston rod seal and a also has molded wall seal.
  • cushioning is also here not shown, so that for the realization of the same again incorporated an additional component would have to be.
  • the known Adhere piston rod seals with respect to the realization of a cushioning is therefore based on the object, the required To minimize space requirements in the realization of a piston end cushioning.
  • a completely new sealing-damping element which in the inner wall of a pressure cylinder or cylinder cover form-fitting fitting is and is suitable to surround the piston rod sealing and as Endlagenanschlagsdämpfung to serve for the piston of the piston rod.
  • the Seal damper element according to the invention serves to realize two Tasks. On the one hand, the sealing-damping element takes on the task of Piston rod seal true. For this purpose, the seal-damping element to the Piston rod arranged around and lies with a Kolbestangendichtungsabsacrificing to the Piston rod around collar-like and tight.
  • the seal-damping element is suitable, either directly in a pressure cylinder or fitted in a corresponding cylinder cover to become.
  • These two components - pressure cylinder and Zylinderdeckel- are in the frame of the present invention under the unitary term "cylinder housing" to subsume.
  • the seal-damping element at least two lips, one of which is the task of a Sealing lip perceives to sealingly abut the piston rod.
  • the other lip is designed as a Kolgestangenabstreifer and also abuts the piston rod.
  • the piston rod seal portion of the seal damping element according to the invention an external preferably designed as a sealing lip sealing portion on which the seal-damping element against the cylinder housing of the pressure cylinder so for example seals against the cylinder cover or the cylinder itself.
  • the seal-damping element thus, for example, directly into the pressure cylinder or be fitted in an associated cylinder cover and sealed against it.
  • the seal-damping element According to the invention a Endlagendämpfungsabites, which with the Piston rod sealing portion integrally connected and concentric to this is arranged.
  • the Endlagendämpfungsabêt of approximately hollow cylindrical shape and lies with its outer wall on the Inner wall of the cylinder or the cylinder cover.
  • the transition region between the Both sections designed so that the deformation of the Endlagendämpfungsabitess can not transfer to the piston rod seal portion.
  • the seal-damping element according to the invention to be able to do justice, is the whole element on a one-piece elastomeric molding, facing on the piston Surface of the Endlagendämpfungsabiteses either at least two raised Stop surfaces or at least an annular stop surface is formed.
  • sealing-damping element thus proves to be advantageous that with this the required space in the realization of Endlagenanschlagdämpfung can be minimized by reducing the required number of components. Another advantage, of course, is that by reducing the required components the cost of a pressure cylinder with End position stop damping can be reduced. Another advantage of According to the invention sealing-damping element is that by the Using the same a simpler injection-technical production of the receiving bore can be made possible, in contrast to conventional piston rod seals for the fixation of the same no installation grooves are provided in the receiving bore must, which can not be demolded by injection molding and only by additional parts, such as Press-fit, can be realized, which in turn causes additional costs.
  • FIG. 1 In the pressure cylinder shown in FIG. 1 is a simple acting pneumatic cylinder 8, the working chamber 13 via a pressure medium connection 12 with a pressure medium such as oil or gas can be applied to the Piston 10 of the pneumatic cylinder 8 from the position shown here in upward To move towards his final position.
  • the pneumatic cylinder 8 consists of a Cylinder housing 11 and a movable therein in the stroke direction piston rod 14 with a piston 10 arranged thereon.
  • the one shown here is simple acting pneumatic cylinder 8 a spring 9, to the piston rod 14 together with the piston 10 their end position to move back in the direction of the position shown here.
  • the embodiment described here by way of example is a simple one acting pressure cylinder with a seal-damping element according to the invention 1, it goes without saying, however, that the sealing-damping element according to the invention also with other pressure medium cylinders, such as a double acting pressure cylinder can be used. Even if this one shown single-acting pressure cylinder a Kobenstangendichtungselement is not necessary in principle, it proves to be advantageous here too incorporate the seal-damping element 1 according to the invention, since thus, for example a single-acting pressure medium cylinder easily converted into a double-acting can be.
  • a additional restoring force can be generated.
  • FIG. 2 the detail "X" of FIG. 1 in Fig. 2 in shown enlarged.
  • the seal-damping element 1 is made of an elastomeric material and consists essentially of a Sealing section A and a stop or damping section B, both concentric arranged to each other and connected to a one-piece component.
  • the stop or damping section B consists of a substantially hollow cylinder-like section and lies with its outer wall on a corresponding inner wall of the Cylinder housing 11 on. To not damaged as a result of the abutment of the piston 10 are at the damping portion B on the piston 10 surface facing Furthermore, a plurality of raised stop surfaces 2 formed.
  • the sealing section A consists of an inner sealing lip 5 and a scraper 4, the both enclose the piston rod 14 collar-like and tight.
  • the Sealing section A an outer side sealing lip 3, which the seal-damping element. 1 seals against the cylinder housing 11.
  • the inner wall of the cylinder housing 11th a contour which is substantially the outer shape of the seal-damping element 1 corresponds.
  • the cylinder housing 11 at its Inner wall of a dovetail-like bulge 6, as a safety claw acts, so, due to its shape, the seal-damping element 1 against To fix displacements as a result of acting forces.
  • the Dovetail-like claw 6 has an extension pointing in the direction of the piston 10 7, which, when the seal-damping element 1 in the recess in the Cylinder housing 11 was pressed, in the transition region between the stop or Damping section B and the sealing section A comes to rest.
  • the damping portion B is substantially of the Sealing section A decoupled, so that deformations that occur in the damping case, ie when the piston 10 abuts the seal-damping element 1, not from the Damping section B transferred to the sealing section A.
  • the piston 10 moves along the Lifting direction to the inventive seal damping element 1 and comes in its end position on the stop surfaces 2 to lie and push in consequence of its remaining Motion energy the stop or damping portion B of the seal-damping element 1 together, whereby the movement of the piston 10 is damped and on Zero is slowed down.
  • the constriction in the transition area between the Damping section B and the sealing section A transmits the deformation of the Damping section B in the damping case is not on the sealing portion A, whereby the safe sealing and Abstreiffunktion the sealing section A can be guaranteed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Damping Devices (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
EP04105496A 2003-11-03 2004-11-03 Joint d'étanchéité pour tube cylindrique et piston Withdrawn EP1528266A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2003151128 DE10351128B4 (de) 2003-11-03 2003-11-03 Kolbenstangendichtung für einen Druckmittelzylinder
DE10351128 2003-11-03

Publications (1)

Publication Number Publication Date
EP1528266A1 true EP1528266A1 (fr) 2005-05-04

Family

ID=34399646

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04105496A Withdrawn EP1528266A1 (fr) 2003-11-03 2004-11-03 Joint d'étanchéité pour tube cylindrique et piston

Country Status (2)

Country Link
EP (1) EP1528266A1 (fr)
DE (1) DE10351128B4 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2107256A1 (fr) * 2008-03-31 2009-10-07 Carl Freudenberg KG Vérin pneumatique à fin de course amortie
EP2657541A3 (fr) * 2012-04-24 2016-05-25 Parker Hannifin Manufacturing Germany GmbH & Co. KG Agencement d'étanchéité pour un système d'étanchéification de cylindre
CN113048119A (zh) * 2021-04-14 2021-06-29 陈润英 一种缓冲液压油缸

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3913460A (en) * 1972-08-10 1975-10-21 Mosier Ind Inc Impact damping means for fluid cylinders
US4852862A (en) * 1987-07-25 1989-08-01 Fritz Bauer And Sohne Ohg Fluid-filled piston-cylinder unit
GB2267131A (en) * 1992-05-19 1993-11-24 Dowty Seals Ltd A seal assembly
GB2280487A (en) * 1993-07-30 1995-02-01 Camloc Gas springs and seals therefor
DE19822805A1 (de) * 1998-05-20 1999-12-09 Ro Ra Vertriebs Ges M B H Dichtungsanordnung mit Dichtung als Zentrierelement
US20030178786A1 (en) * 2000-03-07 2003-09-25 Uwe Siegrist Scraper with integrated seal

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4039173A1 (de) * 1990-12-05 1992-06-11 Mannesmann Ag Kolbenstangendichtung
DE19714647A1 (de) * 1997-04-09 1998-10-15 Suspa Compart Ag Kolbenstangen-Zylinder-Einheit
DE10153336A1 (de) * 2001-10-29 2005-05-19 Bosch Rexroth Teknik Ab Druckmittelzylinder mit einer Einrichtung zur Verstellung des Kolbenhubs

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3913460A (en) * 1972-08-10 1975-10-21 Mosier Ind Inc Impact damping means for fluid cylinders
US4852862A (en) * 1987-07-25 1989-08-01 Fritz Bauer And Sohne Ohg Fluid-filled piston-cylinder unit
GB2267131A (en) * 1992-05-19 1993-11-24 Dowty Seals Ltd A seal assembly
GB2280487A (en) * 1993-07-30 1995-02-01 Camloc Gas springs and seals therefor
DE19822805A1 (de) * 1998-05-20 1999-12-09 Ro Ra Vertriebs Ges M B H Dichtungsanordnung mit Dichtung als Zentrierelement
US20030178786A1 (en) * 2000-03-07 2003-09-25 Uwe Siegrist Scraper with integrated seal

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2107256A1 (fr) * 2008-03-31 2009-10-07 Carl Freudenberg KG Vérin pneumatique à fin de course amortie
EP2657541A3 (fr) * 2012-04-24 2016-05-25 Parker Hannifin Manufacturing Germany GmbH & Co. KG Agencement d'étanchéité pour un système d'étanchéification de cylindre
CN113048119A (zh) * 2021-04-14 2021-06-29 陈润英 一种缓冲液压油缸

Also Published As

Publication number Publication date
DE10351128B4 (de) 2006-07-13
DE10351128A1 (de) 2005-06-16

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