EP1312810A1 - Unité piston/cylindre avec blocage en rotation entre le piston et la tige - Google Patents

Unité piston/cylindre avec blocage en rotation entre le piston et la tige Download PDF

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Publication number
EP1312810A1
EP1312810A1 EP02023850A EP02023850A EP1312810A1 EP 1312810 A1 EP1312810 A1 EP 1312810A1 EP 02023850 A EP02023850 A EP 02023850A EP 02023850 A EP02023850 A EP 02023850A EP 1312810 A1 EP1312810 A1 EP 1312810A1
Authority
EP
European Patent Office
Prior art keywords
piston
piston rod
cylinder unit
rod
internal thread
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.)
Granted
Application number
EP02023850A
Other languages
German (de)
English (en)
Other versions
EP1312810B1 (fr
Inventor
Karl-Wilhelm Herwig
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.)
Hyco Pacoma GmbH
Original Assignee
Hyco Pacoma 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 Hyco Pacoma GmbH filed Critical Hyco Pacoma GmbH
Publication of EP1312810A1 publication Critical patent/EP1312810A1/fr
Application granted granted Critical
Publication of EP1312810B1 publication Critical patent/EP1312810B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F15B15/08—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

Definitions

  • the invention relates to a piston / cylinder unit with a Cylinder housing, a piston having an axis and one an axis having piston rod, the piston a Piston seal and at least one guide element and via an internal thread arranged in an opening an external thread provided on an extension of the piston rod connected is.
  • the cylinder housing is usually supplemented by a guide bush in which the piston rod of the Piston / cylinder unit is guided and stored.
  • the piston rod can end in a bearing eye with which it is secured against rotation is arranged.
  • the cylinder housing is also with a Provide storage, for example a bearing eye.
  • the piston is with this movable end in the cylinder housing Piston rod connected.
  • the detachable attachment of the piston to the piston rod is a fundamental problem for a piston / cylinder unit.
  • the detachable attachment must be designed so that the piston absorbs the axial forces generated by the fluid and can be transferred to the piston rod. Furthermore, one Sealing of the fluid between the piston and piston rod is required.
  • the extension of the piston rod has a External thread, on which one attaches the piston Lock nut is screwed on.
  • the lock nut has an opening and an assigned internal thread.
  • the lock nut is, for example, with a plastic insert provided as a locking element against loosening acts. A non-positive anti-rotation lock is thus used.
  • piston and the 'lock nut summarized in a single part, so that the associated Internal thread is provided in an opening in the piston.
  • a radial element is provided as a securing element in the piston Stud screw applied in the assembled position on the The extension of the piston rod presses.
  • the piston must be corresponding Have attack surfaces for a twisting tool to the necessary high tightening torque during assembly and that to be able to apply the appropriate loosening torque during disassembly. Special tools are generally indispensable for this.
  • a piston / cylinder unit is the beginning described type known. It has a cylinder housing, a piston having an axis and an axis having piston rod. Between the piston and piston rod a static seal is provided. The piston has a plurality of piston seals that also act as guide elements serve or partially within the scope of professional skills Guide elements can be replaced. The piston is over one internal thread arranged in an opening with a an extension of the piston rod provided external thread. The axes of the threads and the axes of the piston rod and pistons match.
  • the well-known piston / cylinder unit shows no protection against rotation of the piston relative to the piston rod and is also not concerned with a safe and repair-friendly training.
  • the invention has for its object a piston / cylinder unit, which are assembled while avoiding a tightening torque will improve in that the necessary anti-rotation a piston screwed onto a piston rod in different way than previously achieved. It's about one inexpensive training using as little as possible Individual parts.
  • this is the case with a piston / cylinder unit achieved at the outset in that the internal thread of the piston and the external thread of the piston rod corresponding eccentricity to the respective axes of the Piston and the piston rod are provided, and that the Piston on the piston rod with such an angular end position is screwed that the axes of the piston and piston rod cursed with each other.
  • the invention is based on the idea of the internal thread in the area of the piston no longer centric, but eccentric to To arrange the outer peripheral surface of the piston so that the opening of the piston and the internal thread provided therein Eccentric axis get or have the parallel and in Distance to the axis of the piston is arranged. This distance is called eccentricity.
  • the piston rod has the outer one Circumference of its piston rod-side area an axis, while the extension and the external thread have an eccentric axis, which in turn are parallel and at a distance from the axis of the piston rod is arranged.
  • the circumferential surfaces of the piston and piston rod are then in alignment their axes again and it is possible the unit from piston rod, Insert the piston and guide bush into the cylinder housing and assemble.
  • the eccentricity described and the due to the piston seal required anyway and the Guide elements of the piston caused and applied restoring forces are usefully used to create an automatic Twisting between the piston and piston rod under operating conditions to avoid. Surprisingly, these are enough Restoring forces also out to jam the piston in its Do not let the cylinder barrel of the cylinder housing occur. This protection against rotation caused by the eccentricity requires no additional securing elements.
  • the piston attachment therefore advantageously has few components and is therefore also inexpensive to manufacture. They are not even targets required for a turning tool on the piston because of the piston can be screwed on and loosened by hand. tightening are not used, so that other necessary hardening of the end faces on the piston and piston rod omitted.
  • the piston connection advantageously has a short one Construction and contributes to the extent that the piston rod in their full length can be used
  • This eccentric piston connection is particularly useful if the piston rod has a pin in the area of its extension and the piston has a corresponding one in the area of its opening Have bore that with the same and the same Eccentricity as the external thread or the internal thread is provided are and in the area of a static seal is.
  • This static seal is from the field of Surface of the piston rod removed and in the area of the extension transferred. But this is not a disadvantage because piston and piston rod through the arrangement of the piston seal and usually several guide elements, such as guide rings, Guide bands u. Like., A corresponding axial length anyway must have, which is usually larger than the axial Length of the internal and external thread.
  • the internal thread of the Piston be axially continuous and the piston rod the external thread extends over the axial length of the extension have extending.
  • the static seal is then between Internal thread and external thread provided. The seal can too at this point make a force available to you Loosening the piston relative to the piston rod during Counteracts operation of the piston / cylinder unit.
  • the common eccentricity is usually about 0.5% to 5.0% of the diameter of the piston rod.
  • the common eccentricity usually depends on the absolute size of the Diameter of the piston rod. It shouldn't be too big be chosen to be the one caused by the eccentricity To keep bending stress on the piston rod small. on the other hand the common eccentricity must be large enough that the restoring forces of the seal and the guide element of the piston are sufficient to cause a relative rotation of the piston to prevent the piston rod from operating. Particularly advantageous has an eccentricity on the order of about 1-2 mm proven with a piston diameter of 80 mm. Too big Eccentricity is also disadvantageous in that it causes the usable diameters for the internal thread and the external thread is reduced.
  • the piston rod and the piston Have markings to identify the angular end position.
  • markings can be made by applying a punch the piston rod on the one hand and the piston on the other a splash of color or be applied in any other way.
  • the Markings should be permanently applied so that they too in the event of a repair, a clear indication that the Release the angular end position during reassembly. Through such The angular end position is ensured so that the Unit consisting of piston and piston rod in the cylinder housing inserted and the guide bush attached accordingly can be.
  • the piston is in all cases on the piston rod without application of a tightening torque. This increases the ease of repair considerably, but otherwise brings no major disadvantages. That by the eccentricity securing effect is sufficient. An additional second backup proves to be unnecessary.
  • the piston / cylinder unit 1 shown in Fig. 1 shows how Usually a cylinder housing 2, which is tubular is and at one end into a bearing 3. At the other A socket 4 is welded onto the end of the cylinder housing 2, designed to receive a guide bush 5 is. The guide bushing 5 is connected to the shoulder bushing Screws 6 attached.
  • a piston 7 is sliding and sealing in the cylinder housing 2 slidably mounted.
  • the piston 7 has an outer peripheral surface 8, which, as usual, is cylindrical. Concentric the piston 7 has an axis 9 to the peripheral surface 8 on. Are on the outer peripheral surface 8 of the piston 7 Guide and sealing elements arranged, here a guide band 10, a seal 11 and a guide ring 12.
  • the piston 7 has otherwise an opening 13, which is stepped here is. Part of the stepped opening 13 is with a Provided internal thread 14, while another part of the stepped Opening 13 is formed as a cylindrical bore 15. in the The area of this cylindrical bore 15 is a static seal 16 arranged.
  • the opening 13 with its internal thread 14 and the bore 15 with its seal 16 are eccentric the axis 9 of the piston. You have one with it Eccentric axis 17, which is parallel to the axis 9 of the piston 7 extends. The distance between the axis 9 and the eccentric axis 17 is referred to as eccentricity e.
  • the piston / cylinder unit 1 has a piston rod 18, which has an outer diameter 19, the outer circumference the piston rod 18 forms.
  • the piston rod 18 is concentric an axis 20 to its outer circumference. In the assembled position, the axis 9 of the piston 7 is aligned with the Axis 20 of the piston rod 18.
  • the piston rod 18 has on the piston 7 facing End of an extension 21.
  • the extension 21 is in coordination the opening 13 is also stepped.
  • Part of the Extension 21 has a cylindrical peripheral surface 22.
  • On another part of the extension 21 has an external thread 23 Mistake.
  • the extension 21 with its peripheral surface 22 and its External thread 23 is eccentric to the axis 20 of the piston rod 18 arranged and provided.
  • the extension 21 has one Eccentric axis 24.
  • the eccentric axis 24 extends parallel and at a distance from the axis 20 of the piston rod 18. This Distance is called eccentricity e.
  • the eccentricity e of the piston 7 and the eccentricity e of the piston rod 18th match the amount.
  • the piston rod 18 is sliding in the guide bush 5 and performed sealing.
  • the guide bush 5 supports their part reaching into the socket 4 static Seals 29 and 30.
  • the piston rod still has on her the end facing away from the piston 7 a bearing 31, via which the Connection of an implement or the like.
  • the extension 21 has an end extending through the piston 7 a stop 32, which is in the starting position on a End wall of the cylinder housing 2 supports.
  • One about the Piston rod 18 acting force is in this position Bypassing the piston 7 directly into the cylinder housing 2 or whose camp 3 forwarded.
  • the piston / cylinder unit 1 is here double-acting, d. H.
  • the both sides of the Pistons 7 formed pressure chambers can each with a fluid, especially with hydraulic fluid. This is done in a known manner via a corresponding one Control valve.
  • the invention can also be simple Apply and use acting cylinders.
  • the wiper is used to assemble the piston / cylinder unit 1 25, the seal 26, the switching ring 27 and the guide band 28 and the static seals 29 and 30 on the guide bush 5 mounted. Then the piston rod 18 is inserted and the piston 7 after the onset of static Seal 16 screwed on. The screwing can be done by hand because only corresponding frictional forces have to be overcome are. In this screwing operation, the piston 7 rotates around the Eccentric axis 24, with its axis 9 on a circular path about the eccentric axis 24 on the extension 21 of the piston rod 18 emotional. With every revolution there is a relative position between Piston 7 and piston rod 18 passed through, in which the axis 9th of the piston 7 is aligned with the axis 20 of the piston rod 18.
  • the Unscrewing the piston 7 is in such an angular end position 33 ends, in which the axis 9 of the piston 7 with the Axis 20 of the piston rod 18 is aligned. With that, also the Circumferential surface 8 of the piston 7 with the axis 20 of the piston rod and with the tread of the cylinder housing 2.
  • a certain game 34 or a distance between the frontal transition between the piston rod 18 and the Extension 21 on the one hand and the corresponding end face of the Piston 7, on the other hand, because of the production of the internal thread 14 and the external thread 23 bring this with it.
  • this Angular end position 33 is now the unit consisting of piston rod 18, Guide bushing 5 and piston 7 inserted into the cylinder housing and secured with the screws 6.
  • the piston is in this position 7 prevented from rotating relative to the piston rod 18.
  • the piston rod 18 is secured against rotation with its bearing 31 held.
  • the prestressing and restoring forces of the management and Sealing elements 10, 11, 12 and the friction in the area of static seal 16 are sufficient to the angular end position 33 secure so that the piston / cylinder unit remains in operation 1 no relative rotations between pistons 7 and piston rod 18 result.
  • piston 7 and piston rod 18 in turn have a common Eccentricity e, resulting from each revolution of the Screwing the piston 7 onto the extension 21 of the piston rod 18 a cover angular position between the axis 9 of the Piston 7 and the axis 20 of the piston rod 18 results.
  • the static seal 16 between piston 7 and piston rod 18 here in the area of an internal thread 14 on the piston 7 intended.
  • the static seal 16 is in a groove 35 on Extension 21 inserted.
  • the external thread 23 also extends otherwise over the essential length of the extension 21.
  • In the assembled end angle position 33 there is also a play 34 or a distance between the mutually assigned end faces of piston 7 and piston rod 18.
  • markings 37, 38 are provided, which show the angular end position 33.
  • the markings 37, 38 can be punched as a dash of color or the like. They are particularly useful in the event of a repair the easy reaching and checking of the angular end position 33 of the screwed-on piston 7 onto the piston rod 18.
EP02023850A 2001-11-16 2002-10-24 Unité piston/cylindre avec blocage en rotation entre le piston et la tige Expired - Lifetime EP1312810B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10156504A DE10156504C1 (de) 2001-11-16 2001-11-16 Kolben/Zylinder-Einheit mit einem Zylindergehäuse, einem Kolben und einer Kolbenstange
DE10156504 2001-11-16

Publications (2)

Publication Number Publication Date
EP1312810A1 true EP1312810A1 (fr) 2003-05-21
EP1312810B1 EP1312810B1 (fr) 2004-04-14

Family

ID=7706093

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02023850A Expired - Lifetime EP1312810B1 (fr) 2001-11-16 2002-10-24 Unité piston/cylindre avec blocage en rotation entre le piston et la tige

Country Status (5)

Country Link
US (1) US6837144B2 (fr)
EP (1) EP1312810B1 (fr)
AT (1) ATE264460T1 (fr)
DE (2) DE10156504C1 (fr)
ES (1) ES2215963T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3620664A1 (fr) * 2018-09-04 2020-03-11 Liebherr-Components Kirchdorf GmbH Procédé de réparation d'une unité de cylindre à piston dans un machine de travail

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7350453B1 (en) 2005-09-20 2008-04-01 Bailey International Corporation Hydraulic cylinder with rotatable gland
SE530030C2 (sv) * 2006-06-29 2008-02-12 Vaederstad Verken Ab Anordning vid en hydraulcylinder
DE102007037760B4 (de) 2007-08-10 2016-03-24 Pacoma Gmbh Kolben/Zylinder-Einheit mit einem Zylindergehäuse, einem Kolben und einer Kolbenstange
ES2368406B1 (es) * 2011-02-22 2012-09-07 Ceimsa Electromedicina S.L. Compresor de oxígeno.
CN102829024A (zh) * 2012-09-04 2012-12-19 无锡市长江液压缸厂 液压油缸活塞杆与后端盖安装结构
DE102014204617A1 (de) * 2014-03-13 2015-09-17 Zf Friedrichshafen Ag Schaltvorrichtung eines automatisierten Schaltgetriebes
DE102018116564A1 (de) * 2018-07-09 2020-01-09 Wabco Gmbh Linearaktor
AT524517A1 (de) * 2021-07-29 2022-05-15 Avl List Gmbh Längenverstellbare Pleuelstange mit verbessertem Zylinderdeckel

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2987046A (en) * 1958-06-06 1961-06-06 Blackhawk Mfg Co Ram assemblage
US3293993A (en) * 1964-11-05 1966-12-27 Parker Hannifin Corp Joint between a piston head and a piston rod of a fluid motor
FR2420677A1 (fr) * 1978-03-21 1979-10-19 Clark Equipment Co Verin a fluide
DE2937412A1 (de) * 1979-09-15 1981-04-09 Festo-Maschinenfabrik Gottlieb Stoll, 7300 Esslingen Arbeitszylinder
FR2755739A1 (fr) * 1996-11-12 1998-05-15 Chapel Dispositif pour etancher les deux chambres d'un verin, separees par un piston, tout en empechant celui-ci de se debloquer

Family Cites Families (8)

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Publication number Priority date Publication date Assignee Title
US2683422A (en) * 1950-05-19 1954-07-13 Jr Albert Z Richards Rotary engine or compressor
US3238559A (en) * 1964-04-13 1966-03-08 Muller Johann Sausage stuffing machine
US3474710A (en) * 1967-09-01 1969-10-28 Air Mite Devices Inc Cylinder construction using roll pins
US3650182A (en) * 1969-09-17 1972-03-21 Cessna Aircraft Co Closure for fluid pressure vessel
US3885461A (en) * 1973-10-23 1975-05-27 Caterpillar Tractor Co Self-locking piston and rod assembly for a fluid motor or the like
JPS5761837A (en) * 1980-09-29 1982-04-14 Kayaba Ind Co Ltd Prevention equipment of falling of stay damper
US5564327A (en) * 1992-04-22 1996-10-15 Sims; James O. Piston/piston rod assembly
US5904440A (en) * 1997-07-18 1999-05-18 Sims; James O. Piston/piston rod assembly having positive locking means between said piston and said piston rod

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2987046A (en) * 1958-06-06 1961-06-06 Blackhawk Mfg Co Ram assemblage
US3293993A (en) * 1964-11-05 1966-12-27 Parker Hannifin Corp Joint between a piston head and a piston rod of a fluid motor
FR2420677A1 (fr) * 1978-03-21 1979-10-19 Clark Equipment Co Verin a fluide
DE2937412A1 (de) * 1979-09-15 1981-04-09 Festo-Maschinenfabrik Gottlieb Stoll, 7300 Esslingen Arbeitszylinder
FR2755739A1 (fr) * 1996-11-12 1998-05-15 Chapel Dispositif pour etancher les deux chambres d'un verin, separees par un piston, tout en empechant celui-ci de se debloquer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3620664A1 (fr) * 2018-09-04 2020-03-11 Liebherr-Components Kirchdorf GmbH Procédé de réparation d'une unité de cylindre à piston dans un machine de travail

Also Published As

Publication number Publication date
DE50200354D1 (de) 2004-05-19
US20030094097A1 (en) 2003-05-22
US6837144B2 (en) 2005-01-04
EP1312810B1 (fr) 2004-04-14
ES2215963T3 (es) 2004-10-16
ATE264460T1 (de) 2004-04-15
DE10156504C1 (de) 2003-04-10

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