EP0945628B1 - Procédé et pièce de travail pour la fabrication d'une bande d'étanchéité pour un cylindre fendu et sans tige - Google Patents

Procédé et pièce de travail pour la fabrication d'une bande d'étanchéité pour un cylindre fendu et sans tige Download PDF

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Publication number
EP0945628B1
EP0945628B1 EP19990850034 EP99850034A EP0945628B1 EP 0945628 B1 EP0945628 B1 EP 0945628B1 EP 19990850034 EP19990850034 EP 19990850034 EP 99850034 A EP99850034 A EP 99850034A EP 0945628 B1 EP0945628 B1 EP 0945628B1
Authority
EP
European Patent Office
Prior art keywords
workpiece
band
sealing
cylinder
cutting
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
EP19990850034
Other languages
German (de)
English (en)
Other versions
EP0945628A3 (fr
EP0945628A2 (fr
Inventor
Rune Granberg
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.)
Rexroth Mecman AB
Original Assignee
Rexroth Mecman 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
Application filed by Rexroth Mecman AB filed Critical Rexroth Mecman AB
Publication of EP0945628A2 publication Critical patent/EP0945628A2/fr
Publication of EP0945628A3 publication Critical patent/EP0945628A3/fr
Application granted granted Critical
Publication of EP0945628B1 publication Critical patent/EP0945628B1/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
    • F15B15/082—Characterised by the construction of the motor unit the motor being of the slotted cylinder type

Definitions

  • the invention concerns a method and a workpiece according to the preamble of claim 1 and 5 respectively.
  • an inner sealing band is arranged to seal the slot against overpressure in the cylinder spaces between the piston, which is moveable inside the cylinder, and the cylinder end walls.
  • Conventional flexible sealing bands are typically provided with a main portion, being received inside the slot in one way or the other, and sealing elements sealingly co-operating with the areas around the slot.
  • the band is guided downwards into the central portion of the piston between. the axially separate cylinder seals, thus leaving the slot free.
  • the main portion may be dimensioned only in view of the demands put forward on the sealing band in the environment of the slot cylinder, without having to take account of the fact that the main portion has to be used for feeding and guiding when the sealing lips are cut.
  • the guiding and feeding function is instead provided for by the integral strip portion, which, when it has fulfilled its function for assuring adequate handling of the band and the band workpiece when cutting of the sealing lips, may be eliminated by cutting it away lengthwise.
  • the resulting sealing band may be given such dimensions that the deformation work associated with the bending of the band when operating the cylinder is reduced, particularly radically in cases of small cylinders.
  • a further advantage with the invention is that the sealing band having reduced dimensions demands less space in the inside of a piston as well as in the slot.
  • numeral 1 concerns a cross section through a longitudinal workpiece for making a sealing band for inside sealing of a slot cylinder, which may be of a kind being known per se and therefore is not necessary to show here.
  • the workpiece include a main portion 2, having protruding elements 3, 8 and a guiding/feeding strip portion 4, which in this embodiment is comprised of two parallel strips 4', 4", and which is intended for guiding and/or feeding the workpiece in a cutting operation for producing the sealing lips 3.
  • the division of the strip portion 4 into two strips 4', 4" is related to production technical reasons and is associated with an operation wherein the reinforcement thread 9 is placed.
  • the strip portion 4 provides guiding surfaces 5 - 7, which are intended to contact corresponding guiding means in a machine for carrying out a cutting process.
  • the reason for having to cut the sealing lips 3 is that the cutting procedure assure that the sealing lips are really provided with a sufficiently sharp edge as seen at the outer pointed areas on Fig. 1.
  • Other methods of forming the sealing band, such as moulding etc. can not guarantee such sufficiently sharp edges in this region, which in use of the band might result in insufficient sealing of the slot cylinder, since when the edges have too great radius, pressure fluid might find its way between the sealing lips and the cylinder material thus resulting in leakage.
  • the cutting is achieved such that the workpiece is fed through obliquely positioned knives, that cut the band along the cutting planes B-B and C-C for cutting the sealing lips 3, whereupon the main portion may be cut free from the strip portion 4 by a knife acting along the cut A-A.
  • the strip portion is a strip 14 placed as a continuation of the lower surface of the resulting sealing band, whereby one single cutting operation is necessary, which is made in the plane D-D, whereby in one operation the sealing lips 13 are cut at the same time as the main portion 2 is cut free from the guiding/feeding strip 14.
  • the band workpiece 11 provides corresponding guiding surfaces 15 - 17 and, within the body of the main portion 12, correspondingly as the main portion 2 in Fig. 1, a reinforcement thread 19, which preferably is a steel wire.
  • the material of the workpiece is a suitable synthetic material whereof polyurethane may be mentioned.
  • the strip portion 4 may instead of being arranged on an upper side of the main portion, as seen in Fig. 1, be arranged centrally but not extending over the entire width of the sealing lips on the bottom side of the main portion. It is however, preferred that the strip portion is attached as is shown in Fig. 1, since, at the upper surface of the main portion, certain surface smoothness deviations may be tolerated emanating from the cutting which is less tolerable at the inside of the sealing band. Further, the strip portion 4 in Fig. 1 may be made from one single strip instead of two strips 4', 4" as in the Figure.
  • sealing bands having essentially smaller dimensions may be manufactured, particularly in the vertical dimension as seen on Figs. 1 and 2 while maintaining, and even improving the provisions for guiding the band when cutting the lips.
  • the sealing band would have essentially larger final dimensions, particularly in the vertical direction, resulting in the above mentioned drawbacks.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
  • Sealing Devices (AREA)
  • Gasket Seals (AREA)

Claims (7)

  1. Procédé pour fabriquer des bandes d'étanchéité allongées souples pour étancher l'intérieur de fentes axiales d'un cylindre hydraulique du type cylindre sans tige, dans lequel la bande inclut une partie principale (2, 12) et, s'étendant de celle-ci, deux lèvres (3, 13) d'étanchéité destinées à assurer une coopération d'étanchéité avec le cylindre dans des zones situées de chaque côté de la fente, dans lequel on réalise une pièce d'oeuvre sous forme de bande allongée souple (1, 11) à partir d'une matière synthétique en formant la matière synthétique, et dans lequel on fait ensuite avancer la pièce d'oeuvre sous forme de bande à travers un poste de coupe, dans lequel les lèvres d'étanchéité sont coupées (B-B, C-C, D-D) d'un élément (14), ou d'éléments (8), faisant saillie de la partie principale (2, 12), caractérisé en ce qu'une pièce d'oeuvre sous forme de bande (1, 11) est produite, laquelle comprend une partie (4, 14) sous forme de ruban d'une seule pièce le long de l'étendue longitudinale de la pièce d'oeuvre sous forme de bande, et en ce que, lors d'une opération de coupe, on utilise la partie sous forme de ruban pour guider et/ou faire avancer la bande tout en coupant les lèvres (3, 13) d'étanchéité, et en ce que la partie sous forme de ruban est découpée longitudinalement de la partie principale.
  2. Procédé selon la revendication 1, caractérisé en ce que la pièce d'oeuvre sous forme de bande (1) est produite de sorte que la partie sous forme de ruban est attachée à la partie principale (2) du côté qui, en utilisation, est tourné dans la direction à l'écart de la chambre de cylindre.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que les lèvres (3) d'étanchéité sont découpées, par coupe longitudinale de matière excédentaire (8), du côté des lèvres d'étanchéité qui est tourné contre l'extérieur du cylindre lors de l'utilisation.
  4. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que chaque opération de coupe (A-A, B-B, C-C, D-D) est effectuée de façon continue.
  5. Pièce d'oeuvre allongée (1, 11), pour une bande d'étanchéité destinée à étancher l'intérieur de fentes axiales de cylindres hydrauliques du type cylindre sans tige, dans laquelle la bande inclut une partie principale (2, 12) et, s'étendant de celle-ci, un élément (14) ou deux éléments (8) en saillie qui sont destinés à être coupés en lèvres d'étanchéité pour assurer une coopération d'étanchéité avec un cylindre dans des régions situées de chaque côté de la fente,
       caractérisée en ce que la pièce d'oeuvre inclut une partie sous forme de ruban d'une seule pièce (4, 14) le long de l'étendue longitudinale de la pièce d'oeuvre sous forme de bande (1, 11) ; en ce que la partie sous forme de ruban (4, 14) est apte à guider et/ou faire avancer la pièce d'oeuvre (1, 11) tout en coupant les lèvres (3, 13) d'étanchéité ; et en ce que la partie sous forme de ruban (4, 14) est découpée longitudinalement de la partie principale (2, 12).
  6. Pièce d'oeuvre selon la revendication 5, caractérisée en ce qu'elle comprend également de la matière longitudinale excédentaire (8) que l'on peut enlever par découpe, dans les régions des lèvres (3) d'étanchéité, du côté qui, en utilisation, est tourné contre l'extérieur du cylindre.
  7. Pièce d'oeuvre selon la revendication 5 ou 6, caractérisée en ce qu'au moins un fil longitudinal (9, 19) de renfort est inclus à l'intérieur du corps de la partie principale (2, 12).
EP19990850034 1998-03-27 1999-03-11 Procédé et pièce de travail pour la fabrication d'une bande d'étanchéité pour un cylindre fendu et sans tige Expired - Lifetime EP0945628B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9801075A SE511691C2 (sv) 1998-03-27 1998-03-27 Förfarande och ämne för framställning av ett tätningsband till en slitscylinder
SE9801075 1998-03-27

Publications (3)

Publication Number Publication Date
EP0945628A2 EP0945628A2 (fr) 1999-09-29
EP0945628A3 EP0945628A3 (fr) 2001-06-27
EP0945628B1 true EP0945628B1 (fr) 2003-06-11

Family

ID=20410756

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19990850034 Expired - Lifetime EP0945628B1 (fr) 1998-03-27 1999-03-11 Procédé et pièce de travail pour la fabrication d'une bande d'étanchéité pour un cylindre fendu et sans tige

Country Status (4)

Country Link
EP (1) EP0945628B1 (fr)
JP (1) JPH11344118A (fr)
DE (1) DE69908687T2 (fr)
SE (1) SE511691C2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19945067A1 (de) * 1999-09-20 2001-03-22 Bosch Gmbh Robert Kolbenstangenloser Druckmittelzylinder

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1217812B (it) * 1988-06-08 1990-03-30 Univers S P A Dispositivo di tenuta per cilindri pneumatici senz,asta
SE500569C2 (sv) * 1989-09-06 1994-07-18 Bo Granbom Tätningsband vid tryckfluidumcylindrar
FR2762249B1 (fr) * 1997-04-16 1999-07-09 Standard Products Ind Faconnage de joint par decoupe evolutive

Also Published As

Publication number Publication date
EP0945628A3 (fr) 2001-06-27
SE9801075D0 (sv) 1998-03-27
SE511691C2 (sv) 1999-11-08
JPH11344118A (ja) 1999-12-14
EP0945628A2 (fr) 1999-09-29
DE69908687D1 (de) 2003-07-17
DE69908687T2 (de) 2004-04-29
SE9801075L (sv) 1999-09-28

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