EP0508973B2 - Vérin à cylindre et piston - Google Patents

Vérin à cylindre et piston Download PDF

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Publication number
EP0508973B2
EP0508973B2 EP19920850083 EP92850083A EP0508973B2 EP 0508973 B2 EP0508973 B2 EP 0508973B2 EP 19920850083 EP19920850083 EP 19920850083 EP 92850083 A EP92850083 A EP 92850083A EP 0508973 B2 EP0508973 B2 EP 0508973B2
Authority
EP
European Patent Office
Prior art keywords
cylinder tube
end wall
piston
cylinder
peripheral
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
Application number
EP19920850083
Other languages
German (de)
English (en)
Other versions
EP0508973A1 (fr
EP0508973B1 (fr
Inventor
Folke Lennart Röllgardh
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.)
Parker Hannifin AB
Original Assignee
Parker Hannifin AB
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
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Application filed by Parker Hannifin AB filed Critical Parker Hannifin AB
Publication of EP0508973A1 publication Critical patent/EP0508973A1/fr
Application granted granted Critical
Publication of EP0508973B1 publication Critical patent/EP0508973B1/fr
Publication of EP0508973B2 publication Critical patent/EP0508973B2/fr
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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
    • F15B15/1438—Cylinder to end cap assemblies

Definitions

  • the invention relates to a piston-cylinder type actuator in which a cylinder tube is fitted with at least one end wall which at least partly is received in the cylinder tube.
  • end walls to cylinder tubes in actuators usually comprise bolt joints, either short bolts extending through flanges on the cylinder tube and the end walls or tension rods bridging both end walls and the entire length of the cylinder tube.
  • Other common end wall mountings comprise mating threads cut directly on the cylinder tube and on the end walls, or lock rings securing the end walls relative to the cylinder tube.
  • This known device comprises not only a machined weakened portion of the cylinder tube but requires at least two assembling steps.
  • the main object of the invention is to create an end wall mounting method and a piston-cylinder type actuator by which the end wall and cylinder tube design as well as the assembly work is substantially simplified and, thereby, less costly.
  • Fig 1 shows a longitudinal section through a piston-cylinder type actuator according to the invention.
  • Figs 2a-c illustrate in three steps the end wall mounting method according to the invention.
  • Fig 3 shows the completed end wall mounting carried through as illustrated in Figs 2a-c.
  • Fig 4 shows an enlarged fraction of Fig 3.
  • Fig. 5 shows an end view of the device in Fig 3
  • the actuator shown in Fig 1 comprises a cylinder tube 10 with pressure medium communication ports 11, 12 and two end walls 13, 14.
  • One of the end walls 14 has a central opening 16 through which a piston rod 17 extends.
  • the latter has a threaded bore 18 at its outer end for connection to an external load and a threaded inner portion 19 by which a piston 20 is rigidly attached.
  • the piston 20 carries both a seal ring 22 and guide elements 23 for contact with the cylindrical inner surface 24 of the cylinder tube 10.
  • a seal ring 25 is mounted in the end wall opening 16 to sealingly cooperate with the piston rod 17.
  • a coil spring 27 is inserted between the front end wall 14 and the piston 20 to exert a bias load on the latter towards the rear end wall 13.
  • the end walls 13, 14 are formed with circumferential grooves 28 and 29, respectively, for supporting seal rings 30, 31.
  • the end walls 13, 14 are also formed with circumferential mounting grooves 33, 34, which are engaged by lock lugs 35, 36 extending radially inwardly from the inner surface 24 of the cylinder tube 10.
  • the lugs 35, 36 which extend throughout the inner circumference of the cylinder tube 10, are formed by plastic deformation of the latter and form together with the grooves 33, 34 a rigid and permanent mounting means for the end walls 13, 14. Thereby, the flat end surfaces 37, 38 of the end walls 13, 14 are flush with the end surfaces of the cylinder tube 10.
  • the end wall mounting is carried out by means of a mounting tool 40 which serves both as an end wall guiding and introduction means and as a cylinder tube upsetting pressing tool.
  • the tool 40 is formed with a flat front surface 41 and an annular ridge 42 of substantially rectangular cross section and protruding in front of the front surface 41.
  • This ridge 42 has an inner diameter to fit the outside surface 37 of the end wall 13, and the axial extent of the ridge 42 is equal to the distance between the outer end surface 37 of the end wall 13 and the mounting groove 33.
  • the width of the ridge 42 is chosen so as to generate a lug 35 of a correct size to match the groove 33 when pressed against and into the end surface of the cylinder tube 10.
  • the deformation ridge 42 engages the end surface portion 43 of the cylinder tube 10 located at the inner circumference of the latter. See Fig 2b.
  • the embodiments of the invention are not limited to the above described example which includes the formation of a single annular lock lug 35 extending over the entire circumference of the cylinder tube 10.
  • the lock means may comprise a number of shorter lugs distributed over the circumference of the cylinder tube 10, and the mounting groove 33 may as well be replaced by a number of shorter grooves to match the lugs.
  • the mounting tool 40 is formed with a number of short ridge portions for producing such lugs.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)

Claims (5)

  1. Procédé pour monter rigidement une paroi d'extrémité (13, 14) sur un tube de cylindre (10) d'un vérin de type à cylindre et piston, dans lequel la paroi d'extrémité (13, 14) doit être reçue au moins partiellement dans le tube de cylindre (10) et comporte une ou plusieurs rainures périphériques (33, 34),
    caractérisé par
    un processus en une seule étape dans lequel la paroi d'extrémité (13, 14) est introduite dans le tube de cylindre (10) en même temps qu'on applique une force de pression (F) sur une ou plusieurs parties (43) à l'endroit de la circonférence intérieure de la surface d'extrémité respective du tube de cylindre (10), de manière à former, par déformation plastique de la partie ou des parties (43), un ou plusieurs ergots faisant saillie radialement vers l'intérieur (35, 36) pour produire un engagement de verrouillage avec la rainure ou les rainures périphériques (33, 34) formées dans la paroi d'extrémité (13, 14).
  2. Procédé selon la revendication 1,
    caractérisé en ce que
    la paroi d'extrémité (13, 14) est introduite dans le tube de cylindre (10) au moyen d'un outil de montage (40) qui est muni d'un moyen de déformation (42) destiné simultanément à s'engager sur les parties de surfaces d'extrémités (43) et à déformer ces parties de surfaces d'extrémités.
  3. Vérin de type à cylindre et piston, comprenant un tube de cylindre (10), un piston (20) guidé dans un mouvement de va-et-vient à l'intérieur du tube de cylindre (10), et au moins une paroi d'extrémité (13, 14) comportant chacune une surface d'extrémité extérieure (37, 38) et se trouvant logée au moins partiellement dans le tube de cylindre (10), ce tube de cylindre (10) comportant un ou plusieurs ergots périphériques s'étendant radialement vers l'intérieur (35, 36), qui sont formés par déformation plastique d'une ou plusieurs parties (43) de la surface d'extrémité respective du tube de cylindre (10), et sont disposés pour s'engager contre la paroi d'extrémité (13, 14) et bloquer celle-ci par rapport au tube de cylindre (10),
    caractérisé en ce que
    la paroi d'extrémité au moins unique (13, 14) est munie d'une ou plusieurs rainures périphériques (33, 34) placées à une certaine distance axiale de la surface d'extrémité (37, 38), cette rainure ou ces rainures périphériques (33, 34) recevant en prise l'ergot ou les ergots (35, 36) pour former un moyen de monture rigide et permanent de la paroi d'extrémité (13, 14) par rapport au tube de cylindre (10).
  4. Vérin selon la revendication 3,
    caractérisé en ce que
    la rainure ou les rainures périphériques (33, 34) comprennent une rainure unique s'étendant sur toute la circonférence de la paroi d'extrémité (13, 14).
  5. Vérin selon la revendication 4,
    caractérisé en ce que
    l'ergot ou les ergots périphériques (35, 36) comprennent un ergot unique s'étendant sur toute la circonférence intérieure du tube de cylindre (10).
EP19920850083 1991-04-11 1992-04-10 Vérin à cylindre et piston Expired - Lifetime EP0508973B2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9101083A SE468326B (sv) 1991-04-11 1991-04-11 Kolv- cylinderanordning
SE9101083 1991-04-11

Publications (3)

Publication Number Publication Date
EP0508973A1 EP0508973A1 (fr) 1992-10-14
EP0508973B1 EP0508973B1 (fr) 1996-07-17
EP0508973B2 true EP0508973B2 (fr) 1999-09-22

Family

ID=20382429

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19920850083 Expired - Lifetime EP0508973B2 (fr) 1991-04-11 1992-04-10 Vérin à cylindre et piston

Country Status (3)

Country Link
EP (1) EP0508973B2 (fr)
DE (1) DE69212197T3 (fr)
SE (1) SE468326B (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4414583A1 (de) * 1994-04-27 1995-11-02 Teves Gmbh Alfred Ventil
DE4433649A1 (de) * 1994-09-21 1995-11-02 Fichtel & Sachs Ag Verfahren zur Montage eines Kolben-Zylinderaggregats
DE19537038B4 (de) * 1995-10-05 2006-05-24 Stephan Thies Geberzylinder
DE19603384A1 (de) * 1996-01-31 1997-08-07 Teves Gmbh Alfred Befestigungsvorrichtung
DE10152414B4 (de) * 2001-08-29 2013-01-17 Bosch Rexroth Aktiengesellschaft Hydraulikzylinder
JP4246631B2 (ja) 2001-08-29 2009-04-02 ボッシュ レックスロート アクチエンゲゼルシャフト 油圧シリンダ

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2487512A (en) * 1946-01-10 1949-11-08 Automotive & Aircraft Hydrauli Cylinder and cylinder head construction
DE1939707C3 (de) * 1969-08-05 1975-05-07 Robert Bosch Gmbh, 7000 Stuttgart Arbeitszylinder für Druckmittelanlagen
DE2115053A1 (de) * 1971-03-29 1972-10-05 Knapp Mikrohydraulik Gmbh Hydraulik oder Pneumatikzylinder
DE4002558C2 (de) * 1989-02-22 1995-06-29 Knapp Mikrohydraulik Gmbh Hydraulikzylinder

Also Published As

Publication number Publication date
EP0508973A1 (fr) 1992-10-14
DE69212197T3 (de) 2000-05-25
DE69212197T2 (de) 1997-03-06
SE468326B (sv) 1992-12-14
DE69212197D1 (de) 1996-08-22
EP0508973B1 (fr) 1996-07-17
SE9101083D0 (sv) 1991-04-11
SE9101083L (sv) 1992-10-12

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