EP0420828A2 - Dichtungsband für hydraulische Kolben-Zylindereinheit - Google Patents

Dichtungsband für hydraulische Kolben-Zylindereinheit Download PDF

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Publication number
EP0420828A2
EP0420828A2 EP19900850293 EP90850293A EP0420828A2 EP 0420828 A2 EP0420828 A2 EP 0420828A2 EP 19900850293 EP19900850293 EP 19900850293 EP 90850293 A EP90850293 A EP 90850293A EP 0420828 A2 EP0420828 A2 EP 0420828A2
Authority
EP
European Patent Office
Prior art keywords
band
cylinder
piston
sealing
edges
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Withdrawn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
EP19900850293
Other languages
English (en)
French (fr)
Other versions
EP0420828A3 (en
Inventor
Bo Granbom
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.)
Hygrama AG
Original Assignee
Hygrama AG
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 Hygrama AG filed Critical Hygrama AG
Publication of EP0420828A2 publication Critical patent/EP0420828A2/de
Publication of EP0420828A3 publication Critical patent/EP0420828A3/en
Withdrawn legal-status Critical Current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
    • F15B15/08—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 is concerned with a solution to the problem of effecting a seal between the cylinder and sealing band of a piston-cylinder device which is driven by pressurized fluid and which is of the kind defined in the preamble of Claim 1.
  • the band is chamfered or bevelled on its inner surface towards the edges thereof, while the inner surface of the cylinder, on both sides of the slot, is configured with a cylindrical surface having a curvature which is smaller than the curvature of the remainder of the cylinder.
  • the band has been ground along the edges thereof to a suitable edge thickness on only one side of the band, a relatively large amount of material is machined-off along a relatively broad area of the band.
  • the sealing band is less resistant to bending in its transverse direction at the high pressures which prevail in the cylinder, therewith resulting in excessive bending with subsequent leakage of the pressurized fluid.
  • the steel band is bevelled along the edges on both sides of said band, it is not necessary to grind away as much band material as that which is ground away with a band which is ground solely on one side and with the use of substantially the same grinding angle.
  • FIG. 1 An example of the pressurized-fluid piston-cylinder device is illustrated in Figure 1, where reference numeral 1 identifies the actual cylinder, while the reference numeral 2 identifies the movable piston which carries a dogging element 3 to which the object or the apparatus to be manouevered by the device is connected.
  • the cylinder 1 is configured with a slot 4 which is sealed by a steel band 5 in a known manner.
  • the re­ference numeral 6 identifies compressed-air connec­tions.
  • the Swedish Patent Specification No. 388 717 describes in detail the function of the pressurized-fluid piston-­cylinder device and also describes the manner in which the sealing band 5 is held sealingly against the slot and extends through the piston beneath the dogging element.
  • the sealing bands 5 are produced by clipping the bands from a broader, very thin steel band.
  • the clipped bands become deformed along their edges, depending on the method of manufacture, due to the displacement of mate­rial such that, with respect to clipping methods, the material is moved in one direction at one edge of the band and in another direction at the other edge of the band, or is also moved in the same direction at the two edges.
  • Figure 2 illustrates the former case, in which there is formed on one side of the band along one edge thereof a rounding or "radius” 7 and along the other edge a pointed projection or "burr" 8. On the other side of the band, there is obtained in a corresponding manner a burr along the first mentioned edge and a radius along the other edge.
  • Figure 3 illustrates sche­matically a section of a sealing band 5 which has been clipped in accordance with another method, wherewith the band presents radii 7 along its edges on one side of the band and burrs 8 on the other side thereof.
  • the band is ground along its edges on only one side of the blank and because the grinding angle ⁇ is a small angle, a relatively large quantity of material will be removed from the band and the band has only a relatively small resistance to bending in its trans­verse direction, which at high cylinder pressures re­sults in leakage.
  • Figure 4 is a cross-sectional view of an inventive embodiment of a steel sealing band.
  • the edges of the band are ground down on both sides to a chamfer 9 hav­ing an angle ⁇ of about 3-7°.
  • the breadth of the cham­fer 9 along the edge of the band 5 is determined by the height extension a of the band edge compared with the thickness of the band.
  • the height extension a of the band edge should suitably be about 0.04 mm.
  • Figure 4 illustrates in cross-section a band which has been ground symmetrically at angles ⁇ to a band-edge height of a .
  • Figure 5 illustrates in cross-section a band which has been ground in accordance with the in­vention at the angles ⁇ to a band-edge height of a but, as illustrated in Figure 5, the upper side of which band has been ground to a shallower depth than in the case of the cross-section illustrated in Figure 4.
  • Figure 5 is solely intended to illustrate the possi­bility of adapting grinding of the sealing band 5 to different cylinder diameters, and hence it will be understood that grinding according to Figure 5 is con­cerned with a sealing band for cylinders of larger diameters than those for which the band illustrated in Figure 4 is intended.
  • Figure 6 illustrates the manner in which a previously known band, ground solely along the edges of one side thereof, behaves in a non-loaded state (the upper part of the Figure) and in a loaded state (the lower part of the Figure), i.e. when pressure prevails in the cylin­der. In this latter case, the band will bend so that the whole of its ground inner surface will come into abutment with the wall of the cylinder 1.
  • Figure 7 illustrates the corresponding conditions for a band which has been ground in accordance with the invention. When an overpressure prevails in the cylinder, since the inventive band is stiffer than the known band the inventive band will bend to a lesser extent and will abut the inner surface of the cylinder 1 solely through its ground edges.

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)
  • Sealing Devices (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
EP19900850293 1989-09-06 1990-08-31 A sealing band for pressurized fluid piston-cylinder devices Withdrawn EP0420828A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8902935 1989-09-06
SE8902935A SE500569C2 (sv) 1989-09-06 1989-09-06 Tätningsband vid tryckfluidumcylindrar

Publications (2)

Publication Number Publication Date
EP0420828A2 true EP0420828A2 (de) 1991-04-03
EP0420828A3 EP0420828A3 (en) 1992-01-22

Family

ID=20376815

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900850293 Withdrawn EP0420828A3 (en) 1989-09-06 1990-08-31 A sealing band for pressurized fluid piston-cylinder devices

Country Status (4)

Country Link
EP (1) EP0420828A3 (de)
JP (1) JPH03149403A (de)
CA (1) CA2024446A1 (de)
SE (1) SE500569C2 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0711928A3 (de) * 1994-11-14 1997-07-30 Smc Kk Kolbenstangenloser Arbeitszylinder
EP0884485A2 (de) * 1997-06-11 1998-12-16 Howa Machinery, Ltd. Kolbenstangenloser Arbeitszylinder
EP0945628A3 (de) * 1998-03-27 2001-06-27 Ab Rexroth Mecman Verfahren und Werkstück zur Herstellung eines Dichtungsbandes für einen geschlitzten, stangenlosen Zylinder

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0033541A1 (de) * 1980-01-31 1981-08-12 Tol-O-Matic, Inc. Druckflüssigkeitszylinder

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0033541A1 (de) * 1980-01-31 1981-08-12 Tol-O-Matic, Inc. Druckflüssigkeitszylinder

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0711928A3 (de) * 1994-11-14 1997-07-30 Smc Kk Kolbenstangenloser Arbeitszylinder
EP0884485A2 (de) * 1997-06-11 1998-12-16 Howa Machinery, Ltd. Kolbenstangenloser Arbeitszylinder
EP0884485A3 (de) * 1997-06-11 1999-06-09 Howa Machinery, Ltd. Kolbenstangenloser Arbeitszylinder
EP0945628A3 (de) * 1998-03-27 2001-06-27 Ab Rexroth Mecman Verfahren und Werkstück zur Herstellung eines Dichtungsbandes für einen geschlitzten, stangenlosen Zylinder

Also Published As

Publication number Publication date
JPH03149403A (ja) 1991-06-26
SE8902935L (sv) 1991-03-07
SE500569C2 (sv) 1994-07-18
EP0420828A3 (en) 1992-01-22
SE8902935D0 (sv) 1989-09-06
CA2024446A1 (en) 1991-03-07

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