EP0499687A1 - Vérin sans tige - Google Patents

Vérin sans tige Download PDF

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Publication number
EP0499687A1
EP0499687A1 EP91115723A EP91115723A EP0499687A1 EP 0499687 A1 EP0499687 A1 EP 0499687A1 EP 91115723 A EP91115723 A EP 91115723A EP 91115723 A EP91115723 A EP 91115723A EP 0499687 A1 EP0499687 A1 EP 0499687A1
Authority
EP
European Patent Office
Prior art keywords
slot
trapezoidal
band
cylinder tube
piston
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
EP91115723A
Other languages
German (de)
English (en)
Other versions
EP0499687B1 (fr
Inventor
Akio Matsui
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.)
Festo SE and Co KG
PUBOT ENGINEERING Co
Original Assignee
Festo SE and Co KG
PUBOT ENGINEERING Co
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 Festo SE and Co KG, PUBOT ENGINEERING Co filed Critical Festo SE and Co KG
Publication of EP0499687A1 publication Critical patent/EP0499687A1/fr
Application granted granted Critical
Publication of EP0499687B1 publication Critical patent/EP0499687B1/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 present invention relates to a rodless cylinder, that is, to a cylinder without a piston rod, and in particular to a rodless cylinder capable of minimizing leakage of pressure medium.
  • Conventional rodless cylinders in which a longitudinally extending slot with a trapezoidal cross-section is made in a cylinder tube, a trapezoidal trapezoidal tape, which is fastened with both ends to the ends of the cylinder tube, is inserted into the slot, and the trapezoidal tape with a piston cooperates, which is slidably inserted into the cylinder tube and fitted to seal the slot of the cylinder tube with the trapezoidal band.
  • the conventional rodless cylinder of the above-mentioned type has shortcomings in that one Area between the piston and the inner surface of the cylinder tube is sealed by means of a piston ring (an annular lip seal) which is fixed in the area of the outer circumference of the piston.
  • a piston ring an annular lip seal
  • that part of the piston ring which is in pressure contact with the horizontal plane of the underside of the trapezoidal band is deformed by imposing a curvature which differs from that of the inner circumferential surface of the cylinder tube.
  • This rodless cylinder has a structure in which a rib 21c is provided between the outer lip 21a and the inner lip 21b of a piston ring 21 which is arranged in the area of the outer periphery of a piston 20 in such a manner that the outer lip 21a passes through the rib 21c is pressed against the inner surface of the cylinder tube 22.
  • this rodless cylinder is designed such that the two sides of a trapezoidal band 23 are provided with concavely curved surfaces, so that when the base of the trapezoidal band 23 is acted upon by the piston ring 21, this base easily corresponds to the curvature of the inner surface of the cylinder tube is deformable to prevent the outer lip 21a from being bent and thus the leakage of the pressure medium is reduced.
  • the above-described conventional rodless cylinder has shortcomings in that - as shown in Fig. 10 - a corner-shaped portion A is formed at a position of the trapezoidal band 23 engaging the slot 24 from the inner surface of the cylinder tube 22, so that a lower sharp-edged one Portion of the trapezoidal band 23 protrudes slightly inward beyond the inner surface of the cylinder tube and creates a level difference due to size tolerances between the trapezoidal band 23 and the slot 24, resulting in a gap or gap C between the outer lip 21a of the piston ring 21 and the inner surface of the cylinder tube results and therefore pressure medium tends to pass through this space C.
  • the present invention has been made to solve the problems described above with reference to the prior art. Accordingly, it is an object of the present invention to provide a rodless cylinder capable of minimizing pressure fluid leakage from the cylinder barrel.
  • a rodless cylinder of the type in which a slit having a substantially trapezoidal cross section is formed in a cylinder tube so as to extend in the longitudinal direction thereof, and one further with both of its end portions fixed at the end regions of the cylinder tube and trapezoidal in cross-section sits in the slot, and in which the trapezoidal band slidably or slidably passes through a piston which is arranged in the cylinder tube and which carries a piston ring in the region of its outer circumference, the piston rodless Cylinder is characterized in that ribs or projections are provided between an outer lip and an inner lip of a piston ring which is in contact with the two edge regions of the underside of the trapezoidal band furthermore, the two side walls of the essentially trapezoidal cross-section slot are each designed with a convexly curved design, so that the two side walls of the slot can be connected to the inner surface of the cylinder tube to form a smooth or flowing
  • strip-shaped or strip-like projections for clamping and holding the trapezoidal band are provided on the outer sections of the two side walls of the slot which has a substantially trapezoidal cross section.
  • the rodless cylinder according to the present invention operates as follows.
  • the piston ring which is generally a U-shaped lip sealing ring with an axially directed U opening, is attached to the outer circumference of the piston, and the ribs are located between the outer and the inner lip of the piston ring, which abuts near the two edge regions of the underside of the trapezoidal band, so that even in a state when the outer lip is pressed and bent over the underside or the bottom of the trapezoidal band, this outer lip from the ribs against the inner surface of the cylinder is pressed to prevent the formation of a gap that normally tends to form between the outer lip and the inner surface of the cylinder barrel. In this way, the leakage of pressure medium is minimized.
  • the two slit sides of the substantially trapezoidal cross-section slit are held in a convexly curved configuration, and the two side walls of the slit can be connected to the inner peripheral surface of the cylinder tube to form a smooth, smooth transition curve.
  • no gap is formed between the outer lip of the piston ring and the inner surface of the cylinder tube if the trapezoidal band is not correctly seated in the slot and therefore the lower, edge-containing section of the trapezoidal band projects slightly inward beyond the inner surface of the cylinder tube , for example due to dimensional deviations between the trapezoidal band and the slot or due to the ingress of dust or the like.
  • the leakage of pressure medium from the cylinder tube can thereby be further reduced.
  • strip-shaped projections are formed on the two upper sections of the side walls of the essentially trapezoidal cross-section slot, between which the trapezoidal band can be clamped and held is so that its portions, which are in a position outside the piston and inside the cylinder tube, can be pressed between the projections in order to be held correctly within the slot.
  • the band is kept from sagging in the cylinder tube in order to reduce the leakage of pressure medium through the slot.
  • Figure 1 shows a longitudinal section of a rodless cylinder.
  • a cylinder tube 1 is closed at both ends by cylinder cover 2, and in a section of the cylinder tube 1 arranged at the top in FIG. 1 there is a circumferentially extending in the longitudinal direction Slot 3 introduced such that it has a substantially trapezoidal cross-sectional configuration, the radially outer periphery of which forms the upper base (shorter side).
  • the two side walls of the slit 3 having a substantially trapezoidal or trapezoidal cross section are configured with a convexly curved configuration, so that the two side walls of the slit 3 formed by the cylinder tube are connected to the inner peripheral surface of the cylinder tube 1 to form a gentle curve are.
  • the upper side or in the radially outer edge of both side walls of the slot 3 there are longitudinal strip-shaped or lip-shaped projections 12 for clamping and holding the band referred to as trapezoidal cross-sectional design 4 and strip-shaped or rib-shaped projections 13 for Clamping and holding a dirt-retaining masking tape 16 formed.
  • the trapezoidal or trapezoidal band 4 is a band inserted into the slot 3 from the inside of the cylinder.
  • the upper part of the trapezoidal band 4 is provided with one or more projections to be clamped between the above-mentioned projections and is fixed at both ends to the two ends of the cylinder tube 1.
  • the trapezoidal band 4 consists of plastic or synthetic resin and / or other reinforced material in order to ensure adequate elasticity and flexibility as well as advantageous sliding properties.
  • the trapezoidal band 4 is shaped so that, as shown in Figure 5, the two starting from the top in the direction of the underside, spreading-apart sides with concave surfaces 4a are designed. The wider base of the band 4 thus points radially inward when installed.
  • a piston 5 to be inserted and fitted into the cylinder tube 1 is constructed such that end portions or end blocks 7 are arranged on both ends of a tubular main body 6 and the end blocks or other parts are clamped by means of a continuous bolt 8 which passes through the center of the main body 6 runs through.
  • Piston rings 10 are inserted into annular grooves, which are formed on both sides of the main body 6 in pairs in succession in the outer circumference of the respective end block 7.
  • an insertion opening 9 is recessed, through which the trapezoidal band 4 enters and exits obliquely in the longitudinal direction of the main body.
  • a coupling part 11 is protruding, which protrudes through the slot 3 to the outside.
  • a groove is provided in a portion of the respective end block 7, which is designed in such a manner that the wider base of the trapezoidal band 4 can slide smoothly, and a groove is also provided in a lower portion of the coupling member 11 , which is designed in such a way that, as can be seen in FIG. 2, the trapezoidal band 4 can slide along smoothly. Furthermore, a groove is provided in an upper section of the coupling part 11, along which the dirt sealing tape or cover tape 16 can slide.
  • the piston ring 10 is made of a high polymer elastomer such as artificial rubber or the like and, as shown in Figures 6 and 7, is equipped with an inner lip 10a and an outer lip 10b, two ribs or projections or reinforcements at certain points between the inner Lip 10a and the outer lip 10b are arranged.
  • the two aforementioned ribs 10c are provided in order to avoid the formation of a space which could arise due to excessive bending of the outer lip 10b, which is in contact with the vicinity of the two lateral regions of the underside of the trapezoidal band 4, or due to one Level difference between the underside of the trapezoidal band 4 and the inner surface of the cylinder tube 1 could arise, which is caused by the dimensional tolerance of the trapezoidal band 4 and the slot 3 in a case when the upper outer portion of the piston ring 10 against the underside of the trapezoidal band 4 pressed and deformed as shown in Figure 3.
  • the ribs are arranged in the area of the outer lip 10b between the latter and the inner lip 10a, in which the lip 10b is in contact near the two side walls of the trapezoidal band 4 with the underside thereof.
  • the ribs 10c may have been integrally formed in the manufacture of the piston ring or may be subsequently arranged on the piston ring, for example by arranging parts of suitable dimensions at the corresponding points on the piston ring and fixing or gluing them to the same.
  • a plate 14 is fixed horizontally on the coupling part 11 projecting upward from the slot 3 of the cylinder tube 1, and dust and dirt wipers 15 are attached to the front and rear end portions of the plate 14, which slide along the masking tape 16 while they are at the same time push this band 14 down towards slot 3.
  • the masking tape 16 is a tape that closes the slot 3 in the cylinder tube 1 from the outside in order to retain contaminants. It preferably consists of a band-shaped stainless steel plate and a projection 16a made of synthetic resin, which is attached to the lower surface of the stainless steel plate as shown in FIG.
  • the cover tape 16 is with its two ends on the inside the cylinder cover 2 is fixed in the same manner as the trapezoidal band 4 and runs along the upper groove in the coupling part 11 to close the outside of the slot 3 in the longitudinal direction.
  • the projection 16a is clamped within the slot 3 between the projections 13 arranged on both longitudinal sides of the slot 3 or is laterally fixed and held.
  • a pressure medium line serving the compressed air supply is connected to a connection opening formed in the cylinder head 2 and serving the compressed air supply, and an object to be moved is coupled or coupled to the plate 14 arranged on the coupling part 11 protruding from the cylinder tube 1 connected. If pressure medium is then supplied via the connection opening, fluid pressure is applied to the right end of the piston 5 shown in FIG. 1, as a result of which the piston 5 is moved to the left.
  • the trapezoidal band 4 is held by the strip projections 12, 12 clamping within the slot, so that the trapezoidal band 4 never sags down into the interior of the cylinder tube 1 and the fluid pressure that is present traps the trapezoidal band 4 from the inside of the cylinder tube Push slot 3 in to securely seal slot 3.
  • the piston cups 10 seal the boundary between the piston 5, the inner surface of the cylinder tube 1 and the underside of the trapezoidal band 4.
  • the upper portion of the piston ring 10 is pressed against the underside of the trapezoidal band 4 and is thereby deformed, whereby a gap or gap easily arises near the two side edges of the underside of the trapezoidal band 4, that is, in an outer edge region of the outer lip 10b is folded over from a curved section to a flat section.
  • this area is reinforced by the ribs 10c to prevent the outer lip 10b from tilting inward, whereby the border area between the outer lip 10b in the area of both longitudinal sides of the underside of the trapezoidal band 4 and the inner surface of the Cylinder tube 1 is advantageously sealed.
  • the two side walls or side surfaces of the slot 3 are designed in a convexly curved or curved configuration and each pass over a slight or flat curve into the inner surface of the cylinder tube 1, so that even if the lower sharp-edged region of the trapezoidal band 4 is light protrudes inward from the inner surface of the cylinder tube - due to dimensional tolerances between the trapezoidal band 4 and the Slit 3 -, no space between the outer lip 10b of the piston ring 10 and the inner surface of the cylinder tube 1 is generated and thereby the leakage of the pressure medium can be minimized.
  • the trapezoidal band 4 has a substantially trapezoidal cross-section, on which its name is based, so that the compressive force acting on the trapezoidal band 4 increases the higher the pressure prevailing within the cylinder, whereby the advantageous sealing effect is achieved.
  • the trapezoidal band 4 is hardly exposed to the actuating force of the piston 5, so that it never expands and contracts, which is why no harmful effects are derived from a possible expansion and contraction of the trapezoidal band 4.
  • Compressed air is particularly suitable as a pressure source for the rodless cylinder of the present invention.
  • this rodless cylinder can also be operated under low hydraulic pressure.
  • the two side walls of the approximately trapezoidal cross-sectional slit are formed in a convexly curved configuration, and the two side walls of the slit are in contact with the inner peripheral surface of the cylinder tube to form a gentle curve or curve Rounding in connection, which is the case even if the trapezoidal band is not correctly fitted into the slot due to dimensional deviations on its part and / or the slot or because of the ingress of dirt, and therefore the lower angular section of the trapezoidal band slightly behind the inner surface of the cylinder tube protrudes inside, there is no gap or space between the outer lip of the piston ring and the inner surface of the cylinder tube, so that the leakage of pressure medium from the cylinder tube is reduced.
  • the strip-shaped projections are between clamping and holding the trapezoidal band on the upper or radially outer portions of the two side walls of the substantially trapezoidal cross-section slot, so that the portion of the trapezoidal band that comes to lie outside the piston is clamped inside the cylinder tube between the projections and is correctly held within the slot. In this way the sagging of the band into the interior of the cylinder tube can be prevented and the leakage of pressure medium through the slot can be reduced.
  • the diaphragm walls are expediently formed by the sections of the cylinder tube which delimit the slot along the longitudinal side - there is preferably such a configuration that the slot width widens from a radially central slot area towards the interior of the cylinder tube, as shown in FIG the figure 4 is expressed.
  • the contouring of the side walls or side surfaces of the slot 3 is expediently at least essentially complementary to the contouring of the concave side surfaces 4a of the trapezoidal band 4.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
EP91115723A 1991-02-19 1991-09-17 Vérin sans tige Expired - Lifetime EP0499687B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP3023639A JPH04266606A (ja) 1991-02-19 1991-02-19 ロッドレスシリンダ
JP23639/91 1991-02-19

Publications (2)

Publication Number Publication Date
EP0499687A1 true EP0499687A1 (fr) 1992-08-26
EP0499687B1 EP0499687B1 (fr) 1995-02-22

Family

ID=12116144

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91115723A Expired - Lifetime EP0499687B1 (fr) 1991-02-19 1991-09-17 Vérin sans tige

Country Status (7)

Country Link
US (1) US5531151A (fr)
EP (1) EP0499687B1 (fr)
JP (1) JPH04266606A (fr)
DE (1) DE59104706D1 (fr)
DK (1) DK0499687T3 (fr)
ES (1) ES2068450T3 (fr)
GR (1) GR3015872T3 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0690237A1 (fr) * 1994-06-28 1996-01-03 Festo KG Entraînement linéaire
EP0733811A2 (fr) * 1995-03-23 1996-09-25 Pubot Giken Co., Ltd. Vérin sans tige et procédé de fabrication d'un tube de cylindre pour un tel vérin
AT401554B (de) * 1994-05-18 1996-10-25 Hygrama Ag Kolbenstangenloser druckmittelzylinder
EP0913589A3 (fr) * 1997-10-31 2001-11-21 Ab Rexroth Mecman Vérin
US6336393B1 (en) 1998-07-01 2002-01-08 Parker-Hannifin Corporation Rodless pneumatic cylinder
DE102004003620B4 (de) * 2004-01-16 2011-12-08 Airtec Pneumatic Gmbh Dichtung bei kolbenstangenlosen Zylindern

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2935321B2 (ja) * 1992-12-24 1999-08-16 日産自動車株式会社 スライド搬送装置
US5988042A (en) * 1997-10-24 1999-11-23 Phd, Inc. Rodless cylinder with internal bearings
US6257123B1 (en) 1997-10-24 2001-07-10 Phd, Inc. Rodless slides
US5996469A (en) * 1998-04-07 1999-12-07 Greenco Manufacturing Corporation Rodless power cylinder
SE512033C2 (sv) * 1998-05-12 2000-01-17 Mecman Ab Rexroth Kolvtätning och slitcylinder med en kolv försedd med två dylika tätningar
US6857780B2 (en) * 2002-11-15 2005-02-22 Phd, Inc. Rodless slide assembly
US8863645B2 (en) * 2007-03-28 2014-10-21 Norgren Gmbh Piston support portion for a piston assembly of a rodless cylinder

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB470088A (en) * 1936-02-03 1937-08-03 Merz Franz Improvements in fluid-operated piston apparatus
CH436617A (de) * 1965-04-20 1967-05-31 Roethlin Albert Hydraulische bzw. pneumatische Fördereinrichtung
DE1475809A1 (de) * 1964-09-04 1969-03-13 Hermann Rasper Vorrichtung zum Versetzen eines ein Aggregat tragenden Kolbens in jede gewuenschte Lage an einem rohrfoermigen Zylinder entlang
EP0033541A1 (fr) * 1980-01-31 1981-08-12 Tol-O-Matic, Inc. Vérin à pression de fluide
GB2163499A (en) * 1984-08-13 1986-02-26 Herion Werke Kg Seal for shuttle piston cylinder
GB2202587A (en) * 1987-03-12 1988-09-28 Ckd Corp Rod-less piston and cylinder assembly

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62184208A (ja) * 1986-02-07 1987-08-12 Akio Matsui ロツドレスシリンダ
DE3631514A1 (de) * 1986-09-17 1988-03-24 Proma Prod & Marketing Gmbh Druckmittelzylinder
IT1217812B (it) * 1988-06-08 1990-03-30 Univers S P A Dispositivo di tenuta per cilindri pneumatici senz,asta

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB470088A (en) * 1936-02-03 1937-08-03 Merz Franz Improvements in fluid-operated piston apparatus
DE1475809A1 (de) * 1964-09-04 1969-03-13 Hermann Rasper Vorrichtung zum Versetzen eines ein Aggregat tragenden Kolbens in jede gewuenschte Lage an einem rohrfoermigen Zylinder entlang
CH436617A (de) * 1965-04-20 1967-05-31 Roethlin Albert Hydraulische bzw. pneumatische Fördereinrichtung
EP0033541A1 (fr) * 1980-01-31 1981-08-12 Tol-O-Matic, Inc. Vérin à pression de fluide
GB2163499A (en) * 1984-08-13 1986-02-26 Herion Werke Kg Seal for shuttle piston cylinder
GB2202587A (en) * 1987-03-12 1988-09-28 Ckd Corp Rod-less piston and cylinder assembly

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT401554B (de) * 1994-05-18 1996-10-25 Hygrama Ag Kolbenstangenloser druckmittelzylinder
EP0690237A1 (fr) * 1994-06-28 1996-01-03 Festo KG Entraînement linéaire
EP0733811A2 (fr) * 1995-03-23 1996-09-25 Pubot Giken Co., Ltd. Vérin sans tige et procédé de fabrication d'un tube de cylindre pour un tel vérin
EP0733811A3 (fr) * 1995-03-23 1998-11-25 Pubot Giken Co., Ltd. Vérin sans tige et procédé de fabrication d'un tube de cylindre pour un tel vérin
EP0913589A3 (fr) * 1997-10-31 2001-11-21 Ab Rexroth Mecman Vérin
US6336393B1 (en) 1998-07-01 2002-01-08 Parker-Hannifin Corporation Rodless pneumatic cylinder
DE102004003620B4 (de) * 2004-01-16 2011-12-08 Airtec Pneumatic Gmbh Dichtung bei kolbenstangenlosen Zylindern

Also Published As

Publication number Publication date
GR3015872T3 (en) 1995-07-31
DK0499687T3 (da) 1995-06-19
EP0499687B1 (fr) 1995-02-22
ES2068450T3 (es) 1995-04-16
US5531151A (en) 1996-07-02
JPH04266606A (ja) 1992-09-22
DE59104706D1 (de) 1995-03-30

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