EP0588779B1 - Hydraulic cylinder - Google Patents

Hydraulic cylinder Download PDF

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Publication number
EP0588779B1
EP0588779B1 EP93890157A EP93890157A EP0588779B1 EP 0588779 B1 EP0588779 B1 EP 0588779B1 EP 93890157 A EP93890157 A EP 93890157A EP 93890157 A EP93890157 A EP 93890157A EP 0588779 B1 EP0588779 B1 EP 0588779B1
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EP
European Patent Office
Prior art keywords
cylindrical tube
cover
hydraulic cylinder
groove
base
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
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EP93890157A
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German (de)
French (fr)
Other versions
EP0588779A1 (en
Inventor
Wolfgang Kladiwa
Klaus Stolle
Gerhard Huber
Walter Kiefer
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.)
Hoerbiger Ventilwerke GmbH and Co KG
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Hoerbiger Ventilwerke GmbH and Co KG
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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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49229—Prime mover or fluid pump making
    • Y10T29/4927—Cylinder, cylinder head or engine valve sleeve making
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49908—Joining by deforming
    • Y10T29/49909—Securing cup or tube between axially extending concentric annuli
    • Y10T29/49911—Securing cup or tube between axially extending concentric annuli by expanding inner annulus
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49908—Joining by deforming
    • Y10T29/49938—Radially expanding part in cavity, aperture, or hollow body
    • Y10T29/4994—Radially expanding internal tube

Definitions

  • the invention relates to a hydraulic cylinder with a cylinder tube, which is provided at one end with a bottom and at the other end with a cover, wherein groove-shaped recesses are provided on the cover and bottom for connecting the cylinder tube on the one hand and the cover and the bottom, into which a Holding area of the respective end of the cylinder tube is pressed in under permanent deformation.
  • Hydraulic cylinders of the type mentioned are known, for example, from DE-A1 22 38 211 and DE-A1 40 02 558 and are used in particular in hydraulic actuated or controlled devices as working cylinders.
  • the aforementioned type of connection between the cylinder tube and the cover or base enables a simpler and more cost-effective production than the solutions of the connection by means of screw threads or soldering or welding, which are also common in this context, which offers advantages in particular in the case of mass articles.
  • the cylinder tube While in the known hydraulic cylinder mentioned above in the first place, the cylinder tube is narrowed by simple bending or flanging and thereby engages in a groove provided on the peripheral surface of the bottom or cover, which does not result in a particularly reliable connection and is not suitable for high working pressures, is formed in the second place as known known hydraulic cylinder one side of the groove-shaped recess frustoconical, the associated end of the cylinder tube is pressed into this recess by compression molding such that the material of the cylinder tube in the region of the groove an annular portion lying against the ground and then forms a conical section lying against the conical surface - the disadvantage here is that the cylinder tube can at least partially slip over said conical surface under higher loads, which results in at least one leak if not an egg n functional failure results.
  • a pressure medium working cylinder in particular for compressed air, is known in which the end of the smooth cylinder tube is fastened by deformation engaging in an annular groove of the cover, the pressure seal being provided by a separate one in the annular groove arranged sealing ring takes place.
  • the object of the present invention is to provide a hydraulic cylinder to improve the type mentioned in such a way that the disadvantages of the known devices are avoided and that, in particular, despite simple and inexpensive manufacture, a secure connection between the cylinder tube on the one hand and the cover and base on the other hand can be ensured.
  • This screwing and in particular its circumferential edge which is outer with respect to the longitudinal extent of the cylinder tube and which, according to a preferred development of the invention, is sharp-edged, claws to a certain extent during the pressing process into the lid or bottom and in particular over the associated inner edge of the groove-shaped recess, with which A highly resilient, positive connection results, according to which the hydraulic cylinder can still be operated safely even with much higher operating pressures than in the known hydraulic cylinders of the type mentioned. In this way, the cylinder tube can no longer simply slip over the pressed parts even when the hydraulic cylinder is subjected to high pressures.
  • a plurality of holding areas with recesses and a number of associated groove-shaped recesses can be provided, which further increases the permissible load capacity of the connection.
  • the cylinder tube consists of a relatively hard material, in particular steel, and the base and / or cover consists of a relatively soft material, in particular aluminum.
  • the base and / or cover consists of a relatively soft material, in particular aluminum.
  • Another preferred development of the invention is characterized in that the bottom and / or cover are designed to overlap the associated end of the cylinder tube and that the respective holding area is pressed from the inside into the groove-shaped recess, which is open on the inside, on the cylinder tube, which is what the design and thus application options increased while maintaining the benefits achieved.
  • FIG. 1 shows a longitudinal section through a hydraulic cylinder designed according to the invention
  • FIG. 2 shows an external view of part of the hydraulic cylinder according to FIG. 1
  • FIG. 3 shows a cylinder tube for use in a hydraulic cylinder according to FIGS. 1 and 2 before pressing Cover or bottom
  • FIG. 4 the enlarged detail IV from FIG. 3
  • FIG. 5 the enlarged detail V from FIG. 3
  • FIG. 6 a separate sectional drawing of the cover of the hydraulic cylinder from FIG. 1 on an enlarged scale
  • FIG. 7 an enlargement of detail VII from FIG. 6.
  • the hydraulic cylinder shown has a cylinder tube 1 in which a piston 2 is guided in the axial direction, the piston rod 3 of which protrudes outwards and is used via a screwed-in piston rod eye 4 to actuate units which are not shown here.
  • the hydraulic cylinder is closed on one side by means of a bottom 6 protruding into one end 5 of the cylinder tube 1 and at the other end 7 by means of a cover 8 which overlaps the cylinder tube 1, hydraulic connections 9 being provided on both the base 6 and the cover 8, which are provided via Lines 10 and 11 are connected to the interior 12 of the cylinder tube 1 and are used for the mutual application of hydraulic medium to actuate the piston 2.
  • a pivot hole 13 for fastening the bottom 6 and thus the entire hydraulic cylinder, for example at a housing location or the like, not shown here, as well as a seal 14 for sealing the piston 2 in the cylinder tube 1 and a seal 15 for sealing the piston rod 3 relative to the cover 8.
  • groove-shaped recesses 16, 17 are provided on cover 8 and base 6, into which a holding area 18, 19 of the respective end 7, 5 of the cylinder tube 1 is pressed with permanent deformation, which results in a positive, secure connection even at high operating pressures.
  • sealing rings 20, 21 are also inserted into associated grooves 22, 23 on the base 6 or cover 8.
  • Fig. 2 can be seen in the holding area 19 when pushing the end 5 of the cylinder 1 into the groove-shaped recess 17 from the outside occurring extrusion marks 24, which by a not shown here, in the radial direction at the same time in many places on the end 5 of the Cylinder tube 1 acting press tool arise, whereby a uniform contact of the holding area 19 and thus a firm and tight connection is achieved.
  • the holding region 18 is pressed evenly into the groove-shaped recess 16 - here, of course, from the inside.
  • the concrete design of the groove-shaped recess 16 including the inner edge 27 on the one hand and the indentations 26 including their outer edge 29 on the other hand are of course also conceivable and possible within the scope of the invention.
  • the bevel 30 on the left side of the groove-shaped recess 16 according to FIG. 7 serves to counteract the axial shortening of the cylinder tube 1 during expansion by the pressing and thus to eliminate play between the pressed parts.

Description

Die Erfindung betrifft einen Hydraulikzylinder, mit einem Zylinderrohr, welches an einem Ende mit einem Boden und am anderen Ende mit einem Deckel versehen ist, wobei zur Verbindung zwischen Zylinderrohr einerseits und Deckel und Boden andererseits nutförmige Ausnehmungen an Deckel und Boden vorgesehen sind, in die ein Haltebereich des jeweiligen Endes des Zylinderrohres unter bleibender Verformung hineingedrückt ist.The invention relates to a hydraulic cylinder with a cylinder tube, which is provided at one end with a bottom and at the other end with a cover, wherein groove-shaped recesses are provided on the cover and bottom for connecting the cylinder tube on the one hand and the cover and the bottom, into which a Holding area of the respective end of the cylinder tube is pressed in under permanent deformation.

Hydraulikzylinder der genannten Art sind beispielsweise aus der DE-A1 22 38 211 bzw. der DE-A1 40 02 558 bekannt und werden in hydraulisch betätigten bzw. gesteuerten Geräten insbesonders als Arbeitszylinder verwendet. Die genannte Art der Verbindung zwischen Zylinderrohr und Deckel bzw. Boden ermöglicht eine einfachere und kostengünstigere Herstellung als die in diesem Zusammenhang ebenfalls gebräuchlichen Lösungen der Verbindung mittels Schraubgewinde bzw. Löten oder Schweißen, was insbesonders bei Massenartikeln Vorteile bietet.Hydraulic cylinders of the type mentioned are known, for example, from DE-A1 22 38 211 and DE-A1 40 02 558 and are used in particular in hydraulic actuated or controlled devices as working cylinders. The aforementioned type of connection between the cylinder tube and the cover or base enables a simpler and more cost-effective production than the solutions of the connection by means of screw threads or soldering or welding, which are also common in this context, which offers advantages in particular in the case of mass articles.

Während bei dem oben an erster Stelle angeführten bekannten Hydraulikzylinder das Zylinderrohr durch einfaches Umbiegen bzw. Umbördeln verengt ist und dadurch in eine an der Umfangsfläche vom Boden bzw. Deckel vorgesehene Nut eingreift, was keine besonders zuverlässige Verbindung ergibt und sich für hohe Arbeitsdrücke nicht eignet, ist bei dem an zweiter Stelle als bekannt angeführten Hydraulikzylinder eine Seite der nutförmigen Ausnehmung kegelstumpfförmig ausgebildet, wobei das zugehörige Ende des Zylinderrohres durch Preßverformen derart in diese Ausnehmung eingedrückt wird, daß das Material des Zylinderrohres im Bereich der Nut einen gegen den Boden anliegenden ringförmigen Abschnitt sowie daran anschließend einen gegen die Kegelfläche anliegenden kegelförmigen Abschnitt bildet - nachteilig dabei ist, daß das Zylinderrohr bei höherer Belastung zumindest teilweise über die genannte Kegelfläche schlüpfen kann, womit sich zumindest eine Undichtheit wenn nicht ein Funktionsausfall ergibt.While in the known hydraulic cylinder mentioned above in the first place, the cylinder tube is narrowed by simple bending or flanging and thereby engages in a groove provided on the peripheral surface of the bottom or cover, which does not result in a particularly reliable connection and is not suitable for high working pressures, is formed in the second place as known known hydraulic cylinder one side of the groove-shaped recess frustoconical, the associated end of the cylinder tube is pressed into this recess by compression molding such that the material of the cylinder tube in the region of the groove an annular portion lying against the ground and then forms a conical section lying against the conical surface - the disadvantage here is that the cylinder tube can at least partially slip over said conical surface under higher loads, which results in at least one leak if not an egg n functional failure results.

Weiters ist beispielsweise aus der DE-U1 79 09 401 ein Druckmittel-Arbeitszylinder, insbesonders für Druckluft, bekannt, bei welchem das Ende des glatten Zylinderrohres durch in eine Ringnut des Deckels greifende Verformung befestigt ist, wobei die Druckabdichtung durch einen separaten, in der Ringnut angeordneten Dichtring erfolgt.Furthermore, for example from DE-U1 79 09 401 a pressure medium working cylinder, in particular for compressed air, is known in which the end of the smooth cylinder tube is fastened by deformation engaging in an annular groove of the cover, the pressure seal being provided by a separate one in the annular groove arranged sealing ring takes place.

Aufgabe der vorliegenden Erfindung ist es, einen Hydraulikzylinder der eingangs genannten Art so zu verbessern, daß die angeführten Nachteile der bekannten Einrichtungen vermieden werden und daß insbesonders trotz einfacher und kostengünstiger Herstellung eine sichere Verbindung zwischen Zylinderrohr einerseits und Deckel und Boden andererseits gewährleistet werden kann.The object of the present invention is to provide a hydraulic cylinder to improve the type mentioned in such a way that the disadvantages of the known devices are avoided and that, in particular, despite simple and inexpensive manufacture, a secure connection between the cylinder tube on the one hand and the cover and base on the other hand can be ensured.

Dies wird gemäß der vorliegenden Erfindung bei einem Hydraulikzylinder der eingangs genannten Art dadurch erreicht, daß im Bereich des bezüglich der Längserstreckung des Zylinderrohres inneren Endes jedes Haltebereiches des unverformten Zylinderrohres eine Eindrehung vorgesehen ist, welche im verformten Zustand des Zylinderrohres über die zugehörige innere Kante der nutförmigen Ausnehmung greift. Diese Eindrehung, und insbesonders ihre bezüglich der Längserstreckung des Zylinderrohres äußere umlaufende Kante, die gemäß einer bevorzugten Weiterbildung der Erfindung scharfkantig ausgebildet ist, krallt sich beim Verpreßvorgang gewissermaßen in den Deckel bzw. Boden und insbesonders über die zugehörige innere Kante der nutförmigen Ausnehmung, womit sich eine hoch belastbare, formschlüssige Verbindung ergibt, zufolge der der Hydraulikzylinder auch mit weitaus höheren Betriebsdrücken als bei den bekannten Hydraulikzylindern der eingangs genannten Art noch sicher betrieben werden kann. Das Zylinderrohr kann auf diese Weise auch bei großen Druckbeaufschlagungen des Hydraulikzylinders nicht mehr einfach über die verpreßten Teile schlüpfen.This is achieved according to the present invention in a hydraulic cylinder of the type mentioned in that in the region of the inner end with respect to the longitudinal extension of the cylinder tube of each holding region of the undeformed cylinder tube, a recess is provided, which in the deformed state of the cylinder tube extends over the associated inner edge of the groove-shaped Recess engages. This screwing, and in particular its circumferential edge which is outer with respect to the longitudinal extent of the cylinder tube and which, according to a preferred development of the invention, is sharp-edged, claws to a certain extent during the pressing process into the lid or bottom and in particular over the associated inner edge of the groove-shaped recess, with which A highly resilient, positive connection results, according to which the hydraulic cylinder can still be operated safely even with much higher operating pressures than in the known hydraulic cylinders of the type mentioned. In this way, the cylinder tube can no longer simply slip over the pressed parts even when the hydraulic cylinder is subjected to high pressures.

In weiterer Ausgestaltung der Erfindung können an jedem Ende des Zylinderrohres auch mehrere Haltebereiche mit Eindrehungen sowie mehrere zugehörige nutförmige Ausnehmungen vorgesehen sein, womit sich die zulässige Belastbarkeit der Verbindung weiter erhöht.In a further embodiment of the invention, at each end of the cylinder tube, a plurality of holding areas with recesses and a number of associated groove-shaped recesses can be provided, which further increases the permissible load capacity of the connection.

Nach einer besonders bevorzugten Ausgestaltung der Erfindung ist vorgesehen, daß das Zylinderrohr aus relativ hartem Werkstoff, insbesonders Stahl, und Boden und/oder Deckel aus relativ weichem Werkstoff, insbesonders Aluminium, besteht. Damit kann sich die Eindrehung - und hier insbesonders deren äußere Kante - beim Eindrück- bzw. Einpreßvorgang in den weicheren Werkstoff von Deckel bzw. Boden drücken bzw. krallen, was die Sicherheit und Dichtheit der Verbindung auf einfache Weise weiter erhöht und größere Möglichkeiten bei der Werkstoffauswahl zuläßt.According to a particularly preferred embodiment of the invention, it is provided that the cylinder tube consists of a relatively hard material, in particular steel, and the base and / or cover consists of a relatively soft material, in particular aluminum. This allows the indentation - and especially its outer edge - to become softer during the indentation or press-in process Press or claw the material from the lid or base, which further increases the security and tightness of the connection in a simple manner and allows greater possibilities in the choice of material.

Eine andere bevorzugte Weiterbildung der Erfindung ist dadurch gekennzeichnet, daß Boden und/oder Deckel das zugehörige Ende des Zylinderrohres übergreifend ausgebildet sind und daß der jeweilige Haltebereich mit seiner außen am Zylinderrohr angebrachten Eindrehung von innen her in die nach innen offene nutförmige Ausnehmung gedrückt ist, was die Gestaltungs- und damit Anwendungsmöglichkeiten unter Beibehaltung der erzielten Vorteile erhöht.Another preferred development of the invention is characterized in that the bottom and / or cover are designed to overlap the associated end of the cylinder tube and that the respective holding area is pressed from the inside into the groove-shaped recess, which is open on the inside, on the cylinder tube, which is what the design and thus application options increased while maintaining the benefits achieved.

Die Erfindung wird im folgenden noch anhand des in der Zeichnung dargestellten Ausführungsbeispiels näher erläutert. Fig. 1 zeigt dabei einen Längsschnitt durch einen erfindungsgemäß ausgeführten Hydraulikzylinder, Fig. 2 eine Außenansicht auf einen Teil des Hydraulikzylinders nach Fig. 1, Fig. 3 ein Zylinderrohr zur Verwendung in einem Hydraulikzylinder nach den Fig. 1 bzw. 2 vor dem Verpressen mit Deckel bzw. Boden, Fig. 4 das vergrößerte Detail IV aus Fig. 3, Fig. 5 das vergrößerte Detail V aus Fig. 3, Fig. 6 eine separate Schnittzeichnung des Deckels des Hydraulikzylinders aus Fig. 1 in vergrößertem Maßstab und Fig. 7 eine Vergrößerung des Details VII aus Fig. 6.The invention is explained in more detail below with reference to the embodiment shown in the drawing. 1 shows a longitudinal section through a hydraulic cylinder designed according to the invention, FIG. 2 shows an external view of part of the hydraulic cylinder according to FIG. 1, FIG. 3 shows a cylinder tube for use in a hydraulic cylinder according to FIGS. 1 and 2 before pressing Cover or bottom, FIG. 4 the enlarged detail IV from FIG. 3, FIG. 5 the enlarged detail V from FIG. 3, FIG. 6 a separate sectional drawing of the cover of the hydraulic cylinder from FIG. 1 on an enlarged scale and FIG. 7 an enlargement of detail VII from FIG. 6.

Der dargestellte Hydraulikzylinder weist ein Zylinderrohr 1 auf, in dem ein Kolben 2 in axialer Richtung geführt ist, dessen Kolbenstange 3 nach außen ragt und über ein eingeschraubtes Kolbenstangenauge 4 zur Betätigung von hier nicht weiter dargestellten Aggregaten dient. Der Hydraulikzylinder ist an einer Seite mittels eines in ein Ende 5 des Zylinderrohres 1 ragenden Bodens 6 und am anderen Ende 7 mittels eines das Zylinderrohr 1 übergreifenden Deckels 8 abgeschlossen, wobei sowohl am Boden 6 als auch am Deckel 8 Hydraulikanschlüsse 9 vorgesehen sind, welche über Leitungen 10 bzw. 11 mit dem Innenraum 12 des Zylinderrohres 1 in Verbindung stehen und zu dessen wechselseitiger Beaufschlagung mit Hydraulikmedium zur Betätigung des Kolbens 2 dienen. Der Vollständigkeit halber ist hier weiters noch auf eine Anlenkbohrung 13 zur Befestigung des Bodens 6 und damit des gesamten Hydraulikzylinders beispielsweise an einer hier nicht dargestellten Gehäusestelle oder dergleichen, sowie auf eine Dichtung 14 zur Abdichtung des Kolbens 2 im Zylinderrohr 1 und eine Dichtung 15 zur Abdichtung der Kolbenstange 3 relativ zum Deckel 8 zu verweisen.The hydraulic cylinder shown has a cylinder tube 1 in which a piston 2 is guided in the axial direction, the piston rod 3 of which protrudes outwards and is used via a screwed-in piston rod eye 4 to actuate units which are not shown here. The hydraulic cylinder is closed on one side by means of a bottom 6 protruding into one end 5 of the cylinder tube 1 and at the other end 7 by means of a cover 8 which overlaps the cylinder tube 1, hydraulic connections 9 being provided on both the base 6 and the cover 8, which are provided via Lines 10 and 11 are connected to the interior 12 of the cylinder tube 1 and are used for the mutual application of hydraulic medium to actuate the piston 2. For the sake of completeness, here is also a pivot hole 13 for fastening the bottom 6 and thus the entire hydraulic cylinder, for example at a housing location or the like, not shown here, as well as a seal 14 for sealing the piston 2 in the cylinder tube 1 and a seal 15 for sealing the piston rod 3 relative to the cover 8.

Zur Verbindung zwischen Zylinderrohr 1 einerseits und Deckel 8 bzw. Boden 6 andererseits sind nutförmige Ausnehmungen 16, 17 an Deckel 8 und Boden 6 vorgesehen, in die ein Haltebereich 18, 19 des jeweiligen Endes 7, 5 des Zylinderrohres 1 unter bleibender Verformung hineingedrückt ist, was eine formschlüssige, sichere Verbindung auch bei hohen Betriebsdrücken ergibt. Zusätzlich sind im Bereich der Enden 5, 7 noch Dichtringe 20, 21 in zugehörige Nuten 22, 23 am Boden 6 bzw. Deckel 8 eingelegt.For the connection between cylinder tube 1 on the one hand and cover 8 or base 6 on the other hand, groove-shaped recesses 16, 17 are provided on cover 8 and base 6, into which a holding area 18, 19 of the respective end 7, 5 of the cylinder tube 1 is pressed with permanent deformation, which results in a positive, secure connection even at high operating pressures. In addition, in the area of the ends 5, 7, sealing rings 20, 21 are also inserted into associated grooves 22, 23 on the base 6 or cover 8.

In Fig. 2 sind die im Haltebereich 19 beim Hineindrücken des Endes 5 des Zyinderrohres 1 in die nutförmige Ausnehmung 17 von außen her auftretenden Preßmale 24 zu ersehen, die durch ein hier nicht dargestelltes, in radialer Richtung an vielen Stellen gleichzeitig auf das Ende 5 des Zylinderrohres 1 einwirkendes Preßwerkzeug entstehen, wodurch eine gleichmäßige Anlage des Haltebereiches 19 und damit eine feste und dichte Verbindung erzielt wird. Auf ähnliche, hier ebenfalls nicht ersichtliche Weise wird auch im Bereich des anderen Endes 7 des Zylinderrohres 1 ein gleichmäßiges Einpressen des Haltebereichs 18 in die nutförmige Ausnehmung 16 - hier natürlich von innen her - vorgenommen.In Fig. 2 can be seen in the holding area 19 when pushing the end 5 of the cylinder 1 into the groove-shaped recess 17 from the outside occurring extrusion marks 24, which by a not shown here, in the radial direction at the same time in many places on the end 5 of the Cylinder tube 1 acting press tool arise, whereby a uniform contact of the holding area 19 and thus a firm and tight connection is achieved. In a similar manner, which is likewise not evident here, even in the region of the other end 7 of the cylinder tube 1, the holding region 18 is pressed evenly into the groove-shaped recess 16 - here, of course, from the inside.

Aus Fig. 3 bis 5 ist ersichtlich, daß im Bereich 25 des bezüglich der Längserstreckung des Zylinderrohres 1 inneren Endes jedes Haltebereiches 18, 19 des unverformten Zylinderrohres 1 eine Eindrehung 26 vorgesehen ist, welche im verformten Zustand (siehe Fig. 1) des Zylinderrohres 1 über die zugehörige innere Kante 27 (siehe auch Fig. 6 und 7), 28 der nutförmigen Ausnehmungen 16, 17 greift. Diese Eindrehung 26, bzw. - wie bei der in Fig. 4 und 5 speziell dargestellten Ausformung derselben einsichtig ist - deren äußere, hier scharfe Kante 29, krallt sich beim Verpreßvorgang in den Werkstoff von Boden 6 bzw. Deckel 8, und zwar insbesonders ausgeprägt dann, wenn die beiden letztgenannten Teile aus weicherem Werkstoff, wie etwa Aluminium, bestehen. Es kommt auf diese Weise zu einer insbesonders in axialer Richtung wirkenden formschlüssigen Verbindung zwischen Zylinderrohr 1 und Boden 6 bzw. Deckel 8, sodaß der Hydraulikzylinder insgesamt mit weitaus höheren Betriebsdrücken als bisher für derartige Verbindungen üblich beaufschlagt werden kann.From FIGS. 3 to 5 it can be seen that in the region 25 of the inner end of each holding region 18, 19 of the undeformed cylinder tube 1 with respect to the longitudinal extension of the cylinder tube 1, a recess 26 is provided, which in the deformed state (see FIG. 1) of the cylinder tube 1 over the associated inner edge 27 (see also FIGS. 6 and 7), 28 of the groove-shaped recesses 16, 17 engages. This indentation 26, or - as is evident in the form of the same shown in FIGS. 4 and 5 - their outer, here sharp edge 29, claws during the pressing process into the material of the bottom 6 or cover 8, especially when the latter two parts consist of a softer material, such as aluminum. This results in a positive connection, in particular in the axial direction, between the cylinder tube 1 and the base 6 or cover 8, so that the hydraulic cylinder as a whole can be subjected to much higher operating pressures than has previously been the case for such connections.

Abweichend von der in den Fig. 4 bis 7 als Beispiel dargestellten konkreten Ausbildung der nutförmigen Ausnehmung 16 samt innerer Kante 27 einerseits und der Eindrehungen 26 samt ihrer äußeren Kante 29 andererseits sind im Rahmen der Erfindung natürlich auch andere Ausbildungen dieser Elemente denkbar und möglich. So dient etwa die Abschrägung 30 an der linken Seite der nutförmigen Ausnehmung 16 gemäß Fig. 7 dazu, der axialen Verkürzung des Zylinderrohres 1 beim Aufweiten durch das Verpressen entgegenzuwirken und damit Spiel zwischen den verpreßten Teilen auszuschalten.4 to 7, as an example, the concrete design of the groove-shaped recess 16 including the inner edge 27 on the one hand and the indentations 26 including their outer edge 29 on the other hand are of course also conceivable and possible within the scope of the invention. For example, the bevel 30 on the left side of the groove-shaped recess 16 according to FIG. 7 serves to counteract the axial shortening of the cylinder tube 1 during expansion by the pressing and thus to eliminate play between the pressed parts.

Wesentlich ist nur, daß durch die Ausbildung der genannten Eindrehungen 26 im verformten Zustand des Zylinderrohres 1 das formschlüssige Übergreifen der inneren Kante 27 der nutförmigen Ausnehmung 16 verbessert wird, womit die angestrebte Verbesserung der Verbindung zwischen Zylinderrohr 1 und Boden 6 bzw. Deckel 8 in axialer Richtung erzielt wird.It is only important that the formation of the above-mentioned indentations 26 in the deformed state of the cylinder tube 1 improves the positive engagement of the inner edge 27 of the groove-shaped recess 16, so that the desired improvement in the connection between the cylinder tube 1 and the base 6 or cover 8 in the axial direction Direction is achieved.

Claims (5)

  1. An hydraulic cylinder, with a cylindrical tube provided at one end with a base and at the other end with a cover, wherein groove-shaped recesses are provided in the cover and the base for fastening between the cylindrical tube on the one hand and the cover and base on the other hand, a holding area of the respective end of the cylindrical tube being pressed into the recesses with permanent deformation, characterized in that an indentation (26) is provided in the region (25) of the inner end - with respect to the longitudinal extension of the cylindrical tube (1) - of each holding area (18, 19) of the non-deformed cylindrical tube (1), and in the deformed state of the cylindrical tube (1) the said indentation (26) engages over the associated inner edge (27, 28) of the groove-shaped recess (16, 17).
  2. An hydraulic cylinder according to Claim 1, characterized in that the outer edge (29) - with respect to the longitudinal extension of the cylindrical tube (1) - of the indentation (26) is constructed with an acute angle.
  3. An hydraulic cylinder according to Claim 1 or 2, characterized in that a plurality of holding areas (18, 19) with indentations (26) as well as a plurality of associated groove-shaped recesses (16, 17) are provided at each end (5, 7) of the cylindrical tube (1).
  4. An hydraulic cylinder according to one of Claims 1 to 3, characterized in that the cylindrical tube (1) consists of a relatively hard material, in particular steel, and the base (6) and/or the cover (8) of a relatively soft material, in particular aluminium.
  5. An hydraulic cylinder according to one or more of Claims 1 to 4, characterized in that the base (6) and/or the cover (8) are constructed so as to engage over the associated end (5, 7) of the cylindrical tube (1), and the respective holding area (18, 19) with its indentation (26) provided in the cylindrical tube (1) on the outside is pressed from the inside into the groove-shaped recess (16, 17) open on the inside.
EP93890157A 1992-09-02 1993-08-19 Hydraulic cylinder Expired - Lifetime EP0588779B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0175992A AT401677B (en) 1992-09-02 1992-09-02 HYDRAULIC CYLINDER
AT1759/92 1992-09-02

Publications (2)

Publication Number Publication Date
EP0588779A1 EP0588779A1 (en) 1994-03-23
EP0588779B1 true EP0588779B1 (en) 1995-05-17

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EP93890157A Expired - Lifetime EP0588779B1 (en) 1992-09-02 1993-08-19 Hydraulic cylinder

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US (1) US5375507A (en)
EP (1) EP0588779B1 (en)
AT (1) AT401677B (en)
DE (1) DE59300205D1 (en)
ES (1) ES2072173T3 (en)
FI (1) FI933820A (en)

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US5651303A (en) * 1994-11-14 1997-07-29 Polygon Company Fluid cylinder end cap assembly
US5465647A (en) * 1994-11-14 1995-11-14 Polygon Company Fluid cylinder end cap assembly
US5622098A (en) * 1996-03-08 1997-04-22 Amalga Composites, Inc. High pressure cylinder with locking end caps
US5680808A (en) * 1996-05-09 1997-10-28 Ingersoll-Rand Company Fluid cylinder and method of assembly
DE19721227A1 (en) * 1997-05-21 1998-11-26 Bosch Gmbh Robert Piston pump
FR2790298B1 (en) * 1999-02-25 2001-05-11 Serta DEVICE FOR CLOSING THE END END OF THE BOTTOM OR ROD GUIDE OF THE PUT OF A WORKING CYLINDER
US6439103B1 (en) 1999-09-07 2002-08-27 Vector Engineering Co. Hydraulic and pneumatic cylinder construction
EP1128073A1 (en) * 2000-02-28 2001-08-29 Serta Method of closing the end which forms the head or rod guide of the barrel of an actuator cylinder
AT408209B (en) * 2000-03-23 2001-09-25 Hoerbiger Hydraulik Activation arrangement for moveable parts on vehicles
US20070074964A1 (en) * 2005-10-03 2007-04-05 Vector Engineering Co. Telescoping fluid actuator

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DE7909401U1 (en) * 1980-09-18 Robert Bosch Gmbh, 7000 Stuttgart Working cylinder
US1658553A (en) * 1922-11-09 1928-02-07 Gen Motors Res Corp Method of making engine cylinders
FR945273A (en) * 1947-04-17 1949-04-29 Improvements to hand-operated pumps, e.g. bicycle pumps
US2832130A (en) * 1953-10-16 1958-04-29 Harvey Machine Co Inc Method of securing an end piece to a tube
US3848325A (en) * 1972-05-01 1974-11-19 C Bimba Method for assembling body and end sections for fluid power cylinder
DE2238211A1 (en) * 1972-08-03 1974-02-14 Haenchen Kg Herbert PRESSURIZED CYLINDRICAL CONTAINER
DE3020390C2 (en) * 1980-05-29 1983-03-24 Festo-Maschinenfabrik Gottlieb Stoll, 7300 Esslingen Working cylinder
JPS57157863A (en) * 1981-03-26 1982-09-29 Showa Mfg Co Ltd Formation of closed end of cylinder
JPS57149659A (en) * 1982-01-11 1982-09-16 Taiyo Tekko Kk Cylinder cover to cylinder tube joining method for liquid pressure cylinder
DE3432443C2 (en) * 1984-09-04 1986-08-14 Klaus Ing.(grad.) 4232 Xanten Dietzel Process for producing a hose compression sleeve for high pressure application and apparatus for carrying out this process
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DE4002558C2 (en) * 1989-02-22 1995-06-29 Knapp Mikrohydraulik Gmbh Hydraulic cylinder

Also Published As

Publication number Publication date
FI933820A0 (en) 1993-09-01
ES2072173T3 (en) 1995-07-01
FI933820A (en) 1994-03-03
EP0588779A1 (en) 1994-03-23
US5375507A (en) 1994-12-27
DE59300205D1 (en) 1995-06-22
ATA175992A (en) 1996-03-15
AT401677B (en) 1996-11-25

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