EP1776527B1 - Locking mechanism for linear actuators - Google Patents

Locking mechanism for linear actuators Download PDF

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Publication number
EP1776527B1
EP1776527B1 EP05774023A EP05774023A EP1776527B1 EP 1776527 B1 EP1776527 B1 EP 1776527B1 EP 05774023 A EP05774023 A EP 05774023A EP 05774023 A EP05774023 A EP 05774023A EP 1776527 B1 EP1776527 B1 EP 1776527B1
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EP
European Patent Office
Prior art keywords
piston rod
fitting
locking
locking device
elements
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EP05774023A
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German (de)
French (fr)
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EP1776527A1 (en
Inventor
Milan Kamenz
Günther ALVERMANN
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Deutsches Zentrum fuer Luft und Raumfahrt eV
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Deutsches Zentrum fuer Luft und Raumfahrt eV
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Publication of EP1776527A1 publication Critical patent/EP1776527A1/en
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    • 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
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/26—Locking mechanisms
    • F15B15/261—Locking mechanisms using positive interengagement, e.g. balls and grooves, for locking in the end positions

Definitions

  • the invention relates to a locking device for linear actuators, in particular for fluid-operated adjusting devices, with an axially displaceably mounted for receiving a piston rod.
  • the invention is particularly suitable for hydraulic adjustment devices that are used for safety-critical applications.
  • Hydraulic locks in the form of a check valve are known from the prior art for hydraulic adjusting devices.
  • check valves for locking the hydraulic adjustment are disadvantageous, since the possibility of leakage is present at each seal located in the system. A malfunction of the valve can have serious consequences.
  • volume changes of the hydraulic fluid which could result in the case of hydraulic locking to the escape of hydraulic fluid by overpressure or by the entry of ambient air by negative pressure.
  • the DE 195 07 689 A1 describes a positioning device for accurate positioning of pneumatic and hydraulic working cylinders, in which an expansion sleeve is arranged in an inner bore of a piston rod of a working cylinder.
  • the expansion sleeve is slotted several times in the longitudinal direction at one end, the segments are provided with an external thread.
  • a mold wedge is arranged, which causes an axial displacement of a spreading of the sleeve.
  • the thread segments on the expansion sleeve engage positively in the internal thread of the piston rod of the working cylinder.
  • the threaded expansion sleeve is rotated.
  • the DE 1 206 316 A1 relates to a pressure-actuated servomotor with a pressure piston and a cylinder, which are displaceable relative to each other under the action of a pressure medium and to which an interlocking locking means is arranged to a pressure piston and cylinder with respect to a Determine relative displacement.
  • the locking means is disposed between a pressure piston and the cylinder and a pressure medium chamber and includes inner and outer members axially displaceable relative to each other, one of the members having one or more projections sized and arranged to be in the locking position interact with complementary recesses in the other member.
  • the object of the present invention is to provide a locking device for linear actuators, in particular for fluid-operated adjusting devices with a piston rod axially displaceably mounted for receiving, with which a secure locking over the entire stroke of the linear actuators is possible.
  • a locking device having the features of claim 1, wherein the piston rod has a cavity extending in the axial direction, are arranged distributed in the axial direction form-fitting devices.
  • form-fitting elements are arranged radially displaceable, which are mounted axially stationary to the recording.
  • the positive-locking elements is associated with an actuating device which radially displaces the interlocking elements. This makes it possible, the positive-locking elements to bring about the actuator in positive engagement with the form-locking devices within the piston rod, so that a positive locking within the piston rod at discrete locations over the entire stroke is possible.
  • the actuating device is designed as an axially displaceable clamping cone, through the axial displacement of which the interlocking elements are brought into or out of engagement with the positive locking devices of the piston rod.
  • the clamping cone is designed as a cap-shaped outer cone into which the counter-cone engages.
  • a development of the invention provides that the form-locking devices are formed within the piston rod as grooves, in particular radially encircling grooves.
  • the positive locking devices are formed in the form of Nutenringen, which are inserted in the piston rod arranged one behind the other.
  • Nutenringen In the hollow piston rod individual rings of different diameters or rings with incorporated grooves are introduced and fixed therein. This also has the advantages of easy production and easy installation.
  • the receptacle for the piston rod is a cylinder, in particular a hydraulic or pneumatic cylinder in which a piston attached to the piston rod is slidably mounted.
  • the piston can be pressurized on both sides, so that the piston rod is mounted displaceably in the axial direction.
  • the form-locking elements are formed radially resilient or radially resiliently mounted to cause a reversibility of the positive engagement easily. It is possible that the positive-locking elements are held during operation of the linear actuator under tension out of engagement with the Form gleich Anlagenen and
  • an embodiment of the invention provides that the positive-locking elements are arranged on a holder or formed projections.
  • the interlocking elements are slidably mounted segments that are radially displaced or radially resilient spring rings that either spring into the form-fitting devices or spring out of these.
  • the holder is designed as an expansion sleeve, which is provided with slots in the axial direction, so that the slotted portions are radially displaceable.
  • the interlocking elements are formed or arranged at the slotted portions, preferably at the ends of the sections, so that a locking of the piston rod with respect to the holder or the receptacle over the entire displacement range of the piston rod is possible.
  • the form-fitting elements are mounted axially stationary to the recording on the holder.
  • the holder or the expansion sleeve is encompassed by the piston rod, at least in the region of the positive locking elements, so that the positive locking elements can engage symmetrically, preferably circumferentially, within the piston rod into the positive locking devices.
  • the actuating device is designed as an axially displaceable clamping cone, through the axial displacement of which the interlocking elements are brought into or out of engagement with the positive locking devices of the piston rod.
  • a complementary to the clamping cone counter cone is formed on the expansion sleeve over which the
  • a pull and locking sleeve is arranged as a support sleeve within the expansion sleeve, which is displaced in the locked state in the region of the slotted sections and exerts a supporting effect.
  • the clamping cone is coupled via a spring-loaded tie rods with the tension and locking sleeve, so that automatically when relieving the tension and locking sleeve is moved by a spring.
  • the FIG. 1 shows a linear actuator 1, in this case a hydraulic adjusting device, with a piston rod 10 which is slidably guided in a receptacle 30 formed as a cylinder.
  • the two ends 2, 3 of the adjusting device 1 have fastening devices which can be attached to movable objects to be stored.
  • the serving as a receptacle for the piston rod 10 cylinder 30 is a hydraulic cylinder in which a piston 31 which is fixed to the piston rod 10, can be moved in the direction of the double arrow.
  • a holder 20 On the side facing away from the piston rod 10 of the cylinder 30, a holder 20 is fixed, which passes through the piston 31 and projects into a cavity 11 of the piston rod 10.
  • the holder 20 has a central bore 25 in which a longitudinally displaceable tie rod 43 is arranged for a tension and locking sleeve, not shown, via a holding device 99 is held stationary.
  • a longitudinally displaceable tie rod 43 is arranged for a tension and locking sleeve, not shown, via a holding device 99 is held stationary.
  • Around the outer wall of the holder 20 around a base plate 32 is arranged, which is fixed to the piston 31.
  • the piston 31 is in turn secured to the piston rod 10, which has in its interior form-fitting devices 12.
  • the form-locking devices 12 are formed in the form of Nutenringen which are stacked within the cavity 11 of the hollow-bore piston rod 10 in a row.
  • the grooved rings 12 are held in the piston rod 10.
  • the groove rings 12 form circumferential grooves.
  • the piston rod 10 and the groove rings 12 are dimensioned so that the piston 31 and the base plate 32 can slide on the holder 20 along.
  • the piston 31 serves in conjunction with the base plate 32 as a guide for the holder 20, thereby obtaining a better buckling strength.
  • the expansion sleeve 20 consists of slotted portions 21 which are formed by axially extending cuts 24.
  • the slotted portions 21 are radial displaced and have on their outside positive locking elements 22 in the form of elevations or pawls.
  • the upper end of the expansion sleeve 20 is formed by a counter-cone 23, which tapers upwards.
  • FIG. 4 is the detail B of the FIG. 1 shown, in which the cylinder housing 30 with the displaceably mounted therein piston rod 10 can be seen.
  • the form-fitting devices 12 are introduced in the form of Nutringen, alternatively, the grooves in the piston rod 10 may be incorporated.
  • the grooves can be designed as a thread (trapezoidal thread or the like), for example as an internal thread within the piston rod 10.
  • the positive locking elements can be designed as external threads on the expansion sleeve 20.
  • the holder 20 Within the piston rod 10 and within the grooved rings 12, the holder 20 is guided, which is designed as a tube. In the holder 20, a pull and lock sleeve 45 is slidably mounted.
  • a tie rod 43 is mounted, which is loaded via a coil spring 45 in the direction of the cylinder-side end of the holder 20.
  • a tie rod 43 is mounted at the piston rod side end of the holder 20 at the piston rod side end of the holder 20 is in the FIG. 3 formed spreading sleeve, which is encompassed by the front end of the tie rod 43.
  • the front end of the tie rod 43 is provided with a clamping cone, which displaces the counter-cone 23 by applying an axial force radially inwardly, so that the outer diameter of the expansion sleeve 20 is reduced.
  • the form-locking elements 22 are brought out of engagement with the form-locking devices 12, so that the piston rod 10 is axially freely movable.
  • FIG. 5 is the detail D the FIG. 4 shown, can be seen from the fact that the clamping cone 40 as an actuator displaces the counter-cone 23 of the expansion sleeve 20 radially inwardly.
  • the expansion sleeve 20 is stretched and the linear actuator 1 is free movable. If the axial holding force on the pull and lock sleeve 45 is eliminated by a holding device 99, as shown in the FIG. 2 is indicated is released, is moved due to the radial stress of the slotted portions 21 of the expansion sleeve 20 by action of the mating cone 23 on the clamping cone 40 of the tie rod 43 in the direction of the piston rod 10.
  • the expansion sleeve 20 relaxes and the slotted portions 21 spring radially outward.
  • the form-fitting elements 22 engage with the form-locking devices 12 and lock the piston rod 10 in this position.
  • the pawls or the projections 22 are pressed by the residual stresses caused by the spring action of the slotted portions 21, as well as by the tensile and locking sleeve 45 loaded by the helical spring, which exerts a wedging action on the inner flank of the expansion sleeve 20, which is still deformed inwardly the Nutenringe 12. If the grooves and the projections or pawls facing each other, there is a snap.
  • the pull and lock sleeve 45 in the opposite direction, ie in the direction of the cylinder 30, moved, the coil spring 44 is biased. Then, the tie rod 43 is positively moved by the pulling and locking sleeve 45, the clamping cone 40 engages with the mating cone 23 and displaces the slotted portions 21 radially inwardly. As a result, the positive-locking elements 22 brought out of engagement with the form-locking devices 12 and the adjusting device 1 is axially freely movable.
  • the locking device can be used anywhere where an axial movement must be reversible, positive and possibly blocked over the entire stroke.
  • the arrangement of the Nutenringe 12 in succession an extremely fine gradation of the interlocking locking is possible.
  • By arranged within the cylinder 30 locking device is given a very good protection against external influences. The entire system is closed, so that damage due to external influences is almost impossible.
  • the reversible locking at discrete positions over the entire stroke of the adjusting device 1 is ensured, so that there is also a possibility for safety-critical applications.
  • the operation of the pull and lock sleeve 45 can be done by the central bore 25 of the holder 20, for example hydraulically or by electric motor. Also, an emergency operation by a primer is possible.
  • all linear actuators can be equipped with it.
  • it is provided to form the clamping cone so that it expands the expansion sleeve 20.
  • displaceably mounted pawls or segments are arranged, which are positively brought into engagement with the Form gleich Anlagenen 12 by these spring-loaded segments are pressed by a cone to the outside. If spring washers are used, these can be analogously disengaged and unlocked if necessary.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
  • Lock And Its Accessories (AREA)

Abstract

The invention relates to a locking device for linear actuators, in particular for fluid-actuated adjusting devices, with a piston rod mounted in an axially displaceable manner relative to a receiving device. The object of the invention is to provide a locking device for linear actuators, with which a secure locking is possible over the entire travel path of the linear actuators. This is attained in that the piston rod has a hollow space extending in the axial direction, in which form-fitting devices are arranged distributed in the axial direction, that form-fitting elements corresponding to the form-fitting devices are arranged in the piston rod in a radially displaceable manner, which elements are mounted in an axially stationary manner relative to the receiving device, and that an actuating device that displaces the form-fitting elements radially is assigned to the form-fitting elements.

Description

Die Erfindung betrifft eine Verriegelungsvorrichtung für Linearaktuatoren, insbesondere für fluidbetätigte Verstelleinrichtungen, mit einer zu einer Aufnahme axial verschieblich gelagerten Kolbenstange. Die Erfindung ist insbesondere für hydraulische Verstelleinrichtungen geeignet, die für sicherheitskritische Anwendungen eingesetzt werden.The invention relates to a locking device for linear actuators, in particular for fluid-operated adjusting devices, with an axially displaceably mounted for receiving a piston rod. The invention is particularly suitable for hydraulic adjustment devices that are used for safety-critical applications.

Aus dem Stand der Technik sind für hydraulische Verstellvorrichtungen hydraulische Verriegelungen in Gestalt eines Rückschlagventils bekannt. Insbesondere bei sicherheitskritischen Anwendungen in der Luftfahrt sind Rückschlagventile zur Verriegelung der hydraulischen Verstelleinrichtung nachteilig, da die Möglichkeit der Leckage an jeder im System befindlichen Dichtung gegeben ist. Eine Fehlfunktion des Ventils kann schwerwiegende Folgen haben. Weiterhin werden durch die im Flugbetrieb vorhandenen Temperaturschwankungen Volumenänderungen des Hydraulikfluids hervorgerufen, die im Falle der hydraulischen Verriegelung zum Austritt von Hydraulikflüssigkeit durch Überdruck oder durch Eintritt von Umgebungsluft durch Unterdruck führen könnten.Hydraulic locks in the form of a check valve are known from the prior art for hydraulic adjusting devices. In particular, in safety-critical applications in aviation check valves for locking the hydraulic adjustment are disadvantageous, since the possibility of leakage is present at each seal located in the system. A malfunction of the valve can have serious consequences. Furthermore, caused by the existing in flight temperature fluctuations volume changes of the hydraulic fluid, which could result in the case of hydraulic locking to the escape of hydraulic fluid by overpressure or by the entry of ambient air by negative pressure.

Weiterhin sind reibschlüssige Verriegelungen über verschiedene Klemmprinzipien bekannt. Nachteilig daran ist die hohe hertzsche Pressung, die zum Bereitstellen der erforderlichen Haltekraft notwendig ist. Darüber hinaus ist der konstruktive Aufwand der Klemmverbindungen außerordentlich hoch und hat ein hohes Strukturgewicht zur Folge. Nachteilig an Klemmverbindungen ist deren Tendenz zur Irreversibilität, so dass nach einer gelung zum Austritt von Hydraulikflüssigkeit durch Überdruck oder durch Eintritt von Umgebungsluft durch Unterdruck führen könnten.Furthermore, friction locks are known via various clamping principles. The disadvantage of this is the high hertzian pressure, which is necessary to provide the necessary holding force. In addition, the design effort of the clamp connections is extremely high and has a high structural weight result. A disadvantage of clamp connections is their tendency to irreversibility, so that after a Hydraulic fluid leakage could be due to overpressure or ingress of ambient air due to vacuum.

Weiterhin sind reibschlüssige Verriegelungen über verschiedene Klemmprinzipien bekannt. Nachteilig daran ist die hohe Hertzsche Pressung, die zum Bereitstellen der erforderlichen Haltekraft notwendig ist. Darüber hinaus ist der konstruktive Aufwand der Klemmverbindungen außerordentlich hoch und hat ein hohes Strukturgewicht zur Folge. Nachteilig an Klemmverbindungen ist deren Tendenz zur Irreversibilität, so dass nach einer Verriegelung ein Lösen der Klemmverbindungen nicht oder nur sehr schwer möglich ist.Furthermore, friction locks are known via various clamping principles. The disadvantage of this is the high Hertzian pressure, which is necessary to provide the necessary holding power. In addition, the design effort of the clamp connections is extremely high and has a high structural weight result. A disadvantage of clamp connections is their tendency to irreversibility, so that after locking a release of the clamp connections is not possible or very difficult.

Aus der DE 31 33 117 C2 ist eine teleskopisch längenveränderliche Stützstrebe für einziehbare Flugzeugfahrwerke bekannt, bei der bei einem komplett eingefahrenen Fahrwerk eine Verriegelung in der Endlage durch Formschluss erfolgt. Eine Verriegelung in einer nicht eingefahrenen Position ist nicht möglich.From the DE 31 33 117 C2 is a telescopically variable-length support strut for retractable aircraft landing gear known, takes place at a completely retracted suspension locking in the final position by positive engagement. Locking in a non-retracted position is not possible.

Die DE 195 07 689 A1 beschreibt eine Positioniervorrichtung zum genauen Positionieren von pneumatischen und hydraulischen Arbeitszylindern, bei der eine Spreizhülse in einer Innenbohrung einer Kolbenstange eines Arbeitszylinders angeordnet ist. Die Spreizhülse ist an einem Ende mehrfach in Längsrichtung geschlitzt, die Segmente sind mit einem Außengewinde versehen. An dem geschlitzten Ende ist ein Formkeil angeordnet, der bei einer axialen Verlagerung ein Aufspreizen der Hülse bewirkt. Dadurch greifen die Gewindesegmente auf der Spreizhülse formschlüssig in das Innengewinde der Kolbenstange des Arbeitszylinders ein. Um eine präzise Positionierung der Kolbenstange zu gewährleisten, wird die Gewindespreizhülse gedreht.The DE 195 07 689 A1 describes a positioning device for accurate positioning of pneumatic and hydraulic working cylinders, in which an expansion sleeve is arranged in an inner bore of a piston rod of a working cylinder. The expansion sleeve is slotted several times in the longitudinal direction at one end, the segments are provided with an external thread. At the slotted end of a mold wedge is arranged, which causes an axial displacement of a spreading of the sleeve. As a result, the thread segments on the expansion sleeve engage positively in the internal thread of the piston rod of the working cylinder. To ensure precise positioning of the piston rod, the threaded expansion sleeve is rotated.

Die DE 1 206 316 A1 betrifft einen druckmittelbetätigten Stellmotor mit einem Druckkolben und einem Zylinder, die unter der Wirkung eines Druckmediums relativ zueinander verschieblich sind und an denen eine ineinander eingreifende Verriegelungseinrichtung angeordnet ist, um einen Druckkolben und Zylinder gegenüber einer Relativverschiebung festzustellen. Die Verriegelungseinrichtung liegt zwischen einem Druckkolben und dem Zylinder und einer Druckmediumkammer und umfasst ein inneres und ein äußeres Glied, die axial relativ zueinander verschieblich sind, wobei eines der Glieder einen oder mehrere Vorsprünge aufweist, die so bemessen und angeordnet sind, dass sie in der Verriegelungsstellung mit komplementären Aussparungen in dem anderen Glied zusammenwirken.The DE 1 206 316 A1 relates to a pressure-actuated servomotor with a pressure piston and a cylinder, which are displaceable relative to each other under the action of a pressure medium and to which an interlocking locking means is arranged to a pressure piston and cylinder with respect to a Determine relative displacement. The locking means is disposed between a pressure piston and the cylinder and a pressure medium chamber and includes inner and outer members axially displaceable relative to each other, one of the members having one or more projections sized and arranged to be in the locking position interact with complementary recesses in the other member.

Aufgabe der vorliegenden Erfindung ist es, eine Verriegelungsvorrichtung für Linearaktuatoren, insbesondere für fluidbetätigte Verstelleinrichtungen mit einer zu einer Aufnahme axial verschieblich gelagerten Kolbenstange bereitzustellen, mit der eine sichere Verriegelung über den gesamten Hubweg der Linearaktuatoren möglich ist.The object of the present invention is to provide a locking device for linear actuators, in particular for fluid-operated adjusting devices with a piston rod axially displaceably mounted for receiving, with which a secure locking over the entire stroke of the linear actuators is possible.

Erfindungsgemäß wird diese Aufgabe durch eine Verriegelungseinrichtung mit den Merkmalen des Anspruchs 1 gelöst, bei der die Kolbenstange einen sich in Axialrichtung erstreckenden Hohlraum aufweist, in dem in Axialrichtung verteilt Formschlusseinrichtungen angeordnet sind. In der Kolbenstange sind zudem zu den Formschlusseinrichtungen korrespondierende Formschlusselemente radial verlagerbar angeordnet, die zu der Aufnahme axial ortsfest gelagert sind. Den Formschlusselementen ist eine Betätigungseinrichtung zugeordnet, die die Formschlusselemente radial verlagert. Dadurch ist es möglich, die Formschlusselemente über die Betätigungseinrichtung in formschlüssigen Eingriff mit den Formschlusseinrichtungen innerhalb der Kolbenstange zu bringen, so dass eine formschlüssige Verriegelung innerhalb der Kolbenstange an diskreten Stellen über den gesamten Hub möglich ist. Dadurch ist es möglich, ohne eine hydraulische Verriegelung und mit einem minimalen konstruktiven Aufwand eine sichere Verriegelung der Linearaktuatoren zu ermöglichen. Darüber hinaus bietet die mechanische Verriegelung durch Formschluss innerhalb der Kolbenstange die Möglichkeit einer geschützten Unterbringung des Verriegelungsmechanismusses. Um auf eine einfache und zuverlässige Art und Weise eine Radialverschiebung der Formschlusselemente zu erreichen, ist die Betätigungseinrichtung als ein axial verschieblicher Spannkonus ausgebildet, durch dessen axiale Verlagerung die Formschlusselemente in Eingriff oder außer Eingriff mit den Formschlusseinrichtungen der Kolbenstange gebracht werden. Dazu ist es vorgesehen, dass an der Spreizhülse ein zu dem Spannkonus komplementärer Gegenkonus ausgebildet ist, über den die Formschlusselemente außer Eingriff mit den Formschlusseinrichtungen gehalten werden. Eine solche Ausbildung ist dann vorgesehen, wenn die Formschlusselemente unter Spannung außer Eingriff gehalten werden. Dazu ist der Spannkonus als ein kappenförmiger Außenkonus ausgebildet, in den der Gegenkonus eingreift.According to the invention this object is achieved by a locking device having the features of claim 1, wherein the piston rod has a cavity extending in the axial direction, are arranged distributed in the axial direction form-fitting devices. In the piston rod also corresponding to the form-locking devices form-fitting elements are arranged radially displaceable, which are mounted axially stationary to the recording. The positive-locking elements is associated with an actuating device which radially displaces the interlocking elements. This makes it possible, the positive-locking elements to bring about the actuator in positive engagement with the form-locking devices within the piston rod, so that a positive locking within the piston rod at discrete locations over the entire stroke is possible. This makes it possible to enable a secure locking of the linear actuators without a hydraulic lock and with minimal design effort. In addition, the mechanical locking by positive engagement within the piston rod offers the possibility of a protected housing of the locking mechanism. In order to achieve a radial displacement of the interlocking elements in a simple and reliable manner, the actuating device is designed as an axially displaceable clamping cone, through the axial displacement of which the interlocking elements are brought into or out of engagement with the positive locking devices of the piston rod. For this purpose, it is provided that on the expansion sleeve to the clamping cone complementary complementary cone is formed, via which the interlocking elements are held out of engagement with the form-locking devices. Such a design is provided when the positive-locking elements are held under tension disengaged. For this purpose, the clamping cone is designed as a cap-shaped outer cone into which the counter-cone engages.

Eine Weiterbildung der Erfindung sieht vor, dass die Formschlusseinrichtungen innerhalb der Kolbenstange als Nuten, insbesondere radial umlaufende Nuten ausgebildet sind. Um eine Kerbwirkung innerhalb der Kolbenstange zu vermeiden und die Stabilität der Kolbenstange nicht zu beeinträchtigen, sind die Formschlusseinrichtungen in Gestalt von Nutenringen ausgebildet, die in der Kolbenstange hintereinander angeordnet eingelegt sind. In der hohlen Kolbenstange sind einzelne Ringe unterschiedlichen Durchmessers oder Ringe mit eingearbeiteten Nuten eingebracht und darin festgelegt. Dies hat zudem die Vorteile einer einfachen Fertigung und leichten Montage.A development of the invention provides that the form-locking devices are formed within the piston rod as grooves, in particular radially encircling grooves. In order to avoid a notch effect within the piston rod and not to impair the stability of the piston rod, the positive locking devices are formed in the form of Nutenringen, which are inserted in the piston rod arranged one behind the other. In the hollow piston rod individual rings of different diameters or rings with incorporated grooves are introduced and fixed therein. This also has the advantages of easy production and easy installation.

Eine Weiterbildung der Erfindung sieht vor, dass die Aufnahme für die Kolbenstange ein Zylinder ist, insbesondere ein Hydraulik- oder Pneumatikzylinder, in dem ein an der Kolbenstange befestigter Kolben verschiebbar gelagert ist. Der Kolben ist beidseitig druckbeaufschlagbar, so dass die Kolbenstange in Axialrichtung hin und her verschieblich gelagert ist.A development of the invention provides that the receptacle for the piston rod is a cylinder, in particular a hydraulic or pneumatic cylinder in which a piston attached to the piston rod is slidably mounted. The piston can be pressurized on both sides, so that the piston rod is mounted displaceably in the axial direction.

Darüber hinaus ist es vorgesehen, dass die Formschlusselemente radial federnd ausgebildet oder radial federnd gelagert sind, um eine Reversibilität des formschlüssigen Eingriffes einfach bewirken zu können. Dabei ist es möglich, dass die Formschlusselemente während des Betriebes des Linearaktuators unter Spannung außer Eingriff mit den Formschlusseinrichtungen gehalten werden undIn addition, it is provided that the form-locking elements are formed radially resilient or radially resiliently mounted to cause a reversibility of the positive engagement easily. It is possible that the positive-locking elements are held during operation of the linear actuator under tension out of engagement with the Formschlusseinrichtungen and

Ausgangsposition federn die Formschlusselemente in die entspannte Stellung zurück, so dass die freie Beweglichkeit des Aktuators oder der Verstellvorrichtung wieder gegeben ist.Starting position spring back the positive locking elements in the relaxed position, so that the free mobility of the actuator or the adjusting device is given again.

Eine Ausgestaltung der Erfindung sieht vor, dass die Formschlusselemente an einem Halter angeordnete oder ausgebildete Vorsprünge sind. Alternativ sind die Formschlusselemente verschieblich gelagerte Segmente, die radial verschoben werden oder radial federnd ausgebildete Federringe, die entweder in die Formschlusseinrichtungen einfedern oder aus diesen ausfedern.An embodiment of the invention provides that the positive-locking elements are arranged on a holder or formed projections. Alternatively, the interlocking elements are slidably mounted segments that are radially displaced or radially resilient spring rings that either spring into the form-fitting devices or spring out of these.

Eine vorteilhafte Variante der Erfindung sieht vor, dass der Halter als eine Spreizhülse ausgebildet ist, die in Axialrichtung mit Schlitzen versehen ist, so dass die geschlitzten Abschnitte radial verlagerbar sind. Die Formschlusselemente sind an den geschlitzten Abschnitten, vorzugsweise an den Enden der Abschnitte ausgebildet oder angeordnet, so dass eine Verriegelung der Kolbenstange in Bezug auf den Halter bzw. die Aufnahme über den gesamten Verschiebebereich der Kolbenstange möglich ist. Die Formschlusselemente sind dabei axial ortsfest zu der Aufnahme an dem Halter gelagert. Der Halter oder die Spreizhülse wird von der Kolbenstange zumindest im Bereich der Formschlusselemente umfasst, so dass die Formschlusselemente symmetrisch, vorzugsweise kreisumfänglich innerhalb der Kolbenstange in die Formschlusseinrichtungen eingreifen können.An advantageous variant of the invention provides that the holder is designed as an expansion sleeve, which is provided with slots in the axial direction, so that the slotted portions are radially displaceable. The interlocking elements are formed or arranged at the slotted portions, preferably at the ends of the sections, so that a locking of the piston rod with respect to the holder or the receptacle over the entire displacement range of the piston rod is possible. The form-fitting elements are mounted axially stationary to the recording on the holder. The holder or the expansion sleeve is encompassed by the piston rod, at least in the region of the positive locking elements, so that the positive locking elements can engage symmetrically, preferably circumferentially, within the piston rod into the positive locking devices.

Um auf eine einfache und zuverlässige Art und Weise eine Radialverschiebung der Formschlusselemente zu erreichen, ist die Betätigungseinrichtung als ein axial verschieblicher Spannkonus ausgebildet, durch dessen axiale Verlagerung die Formschlusselemente in Eingriff oder außer Eingriff mit den Formschlusseinrichtungen der Kolbenstange gebracht werden. Dazu ist es vorgesehen, dass an der Spreizhülse ein zu dem Spannkonus komplementärer Gegenkonus ausgebildet ist, über den die Um ein Ausweichen der Formschlusselemente radial nach innen zu verhindern, wenn diese in Eingriff mit den Formschlusseinrichtungen stehen, ist innerhalb der Spreizhülse eine Zug- und Verriegelungshülse als Stützhülse angeordnet, die im verriegelten Zustand in den Bereich der geschlitzten Abschnitte verlagert wird und eine Stützwirkung ausübt. Dazu ist es vorgesehen, dass der Spannkonus über einen federbelasteten Zuganker mit der Zug- und Verriegelungshülse gekoppelt ist, so dass automatisch bei Entlastung die Zug- und Verriegelungshülse über eine Feder verschoben wird.In order to achieve a radial displacement of the interlocking elements in a simple and reliable manner, the actuating device is designed as an axially displaceable clamping cone, through the axial displacement of which the interlocking elements are brought into or out of engagement with the positive locking devices of the piston rod. For this purpose, it is provided that a complementary to the clamping cone counter cone is formed on the expansion sleeve over which the In order to prevent evasion of the form-fitting elements radially inwardly when they are in engagement with the form-locking devices, a pull and locking sleeve is arranged as a support sleeve within the expansion sleeve, which is displaced in the locked state in the region of the slotted sections and exerts a supporting effect. For this purpose, it is provided that the clamping cone is coupled via a spring-loaded tie rods with the tension and locking sleeve, so that automatically when relieving the tension and locking sleeve is moved by a spring.

Nachfolgend wird ein Ausführungsbeispiel der Erfindung anhand der beigefügten Figuren näher erläutert. Es zeigen:

Figur 1 -
eine Querschnittsansicht einer hydraulischen Verstelleinrich- tung;
Figur 2-
die Einzelheit C der Figur 1;
Figur 3 -
eine Einzeldarstellung einer Spreizhülse;
Figur 4 -
die Einzelheit B in der Figur 1; sowie
Figur 5 -
die Einzelheit D in der Figur 4.
Hereinafter, an embodiment of the invention will be explained in more detail with reference to the accompanying figures. Show it:
FIG. 1 -
a cross-sectional view of a hydraulic adjusting device;
FIG. 2
the detail C of FIG. 1 ;
FIG. 3 -
an individual view of an expansion sleeve;
FIG. 4 -
the detail B in the FIG. 1 ; such as
FIG. 5 -
the detail D in the FIG. 4 ,

Die Figur 1 zeigt einen Linearaktuator 1, vorliegend eine hydraulische Verstelleinrichtung, mit einer Kolbenstange 10, die in einer als Zylinder ausgebildeten Aufnahme 30 verschieblich geführt ist. Die beiden Enden 2, 3 der Verstelleinrichtung 1 weisen Befestigungseinrichtungen auf, die an beweglich zueinander zu lagernden Objekten angebracht werden können. Der als Aufnahme für die Kolbenstange 10 dienende Zylinder 30 ist ein Hydraulikzylinder, in dem ein Kolben 31, der an der Kolbenstange 10 befestigt ist, in Richtung des Doppelpfeils bewegt werden kann. An der der Kolbenstange 10 abgewandten Seite des Zylinders 30 ist ein Halter 20 befestigt, der durch den Kolben 31 hindurchgeht und bis in einen Hohlraum 11 der Kolbenstange 10 hineinragt. An dem kolbenstangenseitigen Ende des Halters 20 sind nicht dargestellte Formschlusselemente ausgebildet, die in ebenfalls nicht dargestellte Formschlusseinrichtungen im Inneren der Kolbenstange 10 bei Bedarf eingreifen. Es erfolgt eine formschlüssige Verriegelung der Kolbenstange 10 im Verhältnis zu dem Zylinder 30 bzw. dem Halter 20, wobei die Verriegelung in nahezu jeder Stellung der Kolbenstange 10 im Verhältnis zu dem Zylinder 30 vorgenommen werden kann, da die Formschlusseinrichtungen aus axial hintereinander angeordneten Nuten bestehen, die in dem Ausführungsbeispiel über die gesamte Länge der Kolbenstange 10 in dem Hohlraum 11 angeordnet sind. In dem dargestellten Zustand sind die Formschlusselemente des Halters 20 außer Eingriff mit den Formschlusseinrichtungen innerhalb der Kolbenstange 10, so dass die Kolbenstange 10 axial frei beweglich ist. Der Halter 20 ist mit dem Zylinder 30 bzw. mit dem Zylindergehäuse verbunden und an diesem festgelegt, so dass auch die Formschlusselemente in Axialrichtung unbeweglich zu dem Zylindergehäuse 30 befestigt sind.The FIG. 1 shows a linear actuator 1, in this case a hydraulic adjusting device, with a piston rod 10 which is slidably guided in a receptacle 30 formed as a cylinder. The two ends 2, 3 of the adjusting device 1 have fastening devices which can be attached to movable objects to be stored. The serving as a receptacle for the piston rod 10 cylinder 30 is a hydraulic cylinder in which a piston 31 which is fixed to the piston rod 10, can be moved in the direction of the double arrow. On the side facing away from the piston rod 10 of the cylinder 30, a holder 20 is fixed, which passes through the piston 31 and projects into a cavity 11 of the piston rod 10. On the piston rod side end of the holder 20, not shown positive-locking elements are formed, which engage in likewise not shown form-fitting devices in the interior of the piston rod 10 as needed. There is a positive locking of the piston rod 10 in relation to the cylinder 30 and the holder 20, wherein the locking can be made in almost every position of the piston rod 10 in relation to the cylinder 30, since the form-locking devices of axially one behind the other arranged grooves which are arranged in the embodiment over the entire length of the piston rod 10 in the cavity 11. In the illustrated state, the form-fitting elements of the holder 20 are out of engagement with the form-locking devices within the piston rod 10, so that the piston rod 10 is axially freely movable. The holder 20 is connected to the cylinder 30 or to the cylinder housing and fixed thereto, so that the positive locking elements are fixed immovably to the cylinder housing 30 in the axial direction.

In der Figur 2 ist die Einzelheit C der Figur 1 in einem vergrößerten Maßstab dargestellt und zeigt in Querschnittsansicht das Zylindergehäuse 30 mit dem darin befestigten Halter 20. Der Halter 20 weist eine Zentralbohrung 25 auf, in der längsverschieblich ein Zuganker 43 für eine nicht dargestellte Zug- und Verriegelungshülse angeordnet ist, die über eine Haltevorrichtung 99 ortsfest gehalten wird. Um die Außenwandung des Halters 20 herum ist eine Grundplatte 32 angeordnet, die an dem Kolben 31 befestigt ist. Der Kolben 31 ist wiederum an der Kolbenstange 10 befestigt, die in ihrem Inneren Formschlusseinrichtungen 12 aufweist. Die Formschlusseinrichtungen 12 sind in Gestalt von Nutenringen ausgebildet, die innerhalb des Hohlraumes 11 der hohl gebohrten Kolbenstange 10 hintereinander geschichtet sind. Durch die Grundplatte 32 werden die Nutringe 12 in der Kolbenstange 10 gehalten. Die Nutringe 12 bilden umlaufende Nuten aus. Die Kolbenstange 10 und die Nutringe 12 sind so dimensioniert, dass der Kolben 31 und die Grundplatte 32 an dem Halter 20 entlang gleiten können. Der Kolben 31 dient in Verbindung mit der Grundplatte 32 als Führung für den Halter 20, der dadurch eine bessere Knickfestigkeit erhält.In the FIG. 2 the detail C is the FIG. 1 The holder 20 has a central bore 25 in which a longitudinally displaceable tie rod 43 is arranged for a tension and locking sleeve, not shown, via a holding device 99 is held stationary. Around the outer wall of the holder 20 around a base plate 32 is arranged, which is fixed to the piston 31. The piston 31 is in turn secured to the piston rod 10, which has in its interior form-fitting devices 12. The form-locking devices 12 are formed in the form of Nutenringen which are stacked within the cavity 11 of the hollow-bore piston rod 10 in a row. By the base plate 32, the grooved rings 12 are held in the piston rod 10. The groove rings 12 form circumferential grooves. The piston rod 10 and the groove rings 12 are dimensioned so that the piston 31 and the base plate 32 can slide on the holder 20 along. The piston 31 serves in conjunction with the base plate 32 as a guide for the holder 20, thereby obtaining a better buckling strength.

An dem nicht dargestellten oberen Ende des Halters 20 ist eine Spreizhülse ausgebildet, wie sie in der Figur 3 gezeigt ist. Die Spreizhülse 20 besteht dabei aus geschlitzten Abschnitten 21, die durch axial verlaufende Schnitte 24 gebildet werden. Die geschlitzten Abschnitte 21 sind radial verlagerbar und weisen auf ihrer Außenseite Formschlusselemente 22 in Gestalt von Erhebungen oder Klinken auf. Der obere Abschluss der Spreizhülse 20 wird durch einen Gegenkonus 23 gebildet, der sich nach oben verjüngt.At the upper end of the holder 20, not shown, an expansion sleeve is formed, as shown in the FIG. 3 is shown. The expansion sleeve 20 consists of slotted portions 21 which are formed by axially extending cuts 24. The slotted portions 21 are radial displaced and have on their outside positive locking elements 22 in the form of elevations or pawls. The upper end of the expansion sleeve 20 is formed by a counter-cone 23, which tapers upwards.

In der Figur 4 ist die Einzelheit B der Figur 1 gezeigt, in der das Zylindergehäuse 30 mit der verschieblich darin gelagerten Kolbenstange 10 zu erkennen ist. In dem Hohlraum der Kolbenstange 10 sind die Formschlusseinrichtungen 12 in Gestalt von Nutringen eingebracht, alternativ können die Nuten in der Kolbenstange 10 eingearbeitet sein. Des Weiteren können die Nuten als Gewinde (Trapezgewinde oder dergl.) ausgestaltet sein, beispielsweise als Innengewinde innerhalb der Kolbenstange 10. Die Formschlusselemente können als Außengewinde auf der Spreizhülse 20 ausgebildet sein. Innerhalb der Kolbenstange 10 und innerhalb der Nutringe 12 ist der Halter 20 geführt, der als Rohr ausgebildet ist. In dem Halter 20 ist eine Zug- und Verriegelungshülse 45 verschieblich gelagert. Innerhalb der Zug- und Verriegelungshülse 45 ist ein Zuganker 43 gelagert, der über eine Spiralfeder 45 in Richtung des zylinderseitigen Endes des Halters 20 belastet wird. An dem kolbenstangenseitigen Ende des Halters 20 ist die in der Figur 3 gezeigte Spreizhülse ausgebildet, die von dem vorderen Ende des Zugankers 43 umfasst wird. Das vordere Ende des Zugankers 43 ist mit einem Spannkonus versehen, der den Gegenkonus 23 durch Aufbringen einer Axialkraft radial nach innen verlagert, so dass der Außendurchmesser der Spreizhülse 20 verkleinert wird. Dadurch werden die Formschlusselemente 22 außer Eingriff mit den Formschlusseinrichtungen 12 gebracht, so dass die Kolbenstange 10 axial frei beweglich ist.In the FIG. 4 is the detail B of the FIG. 1 shown, in which the cylinder housing 30 with the displaceably mounted therein piston rod 10 can be seen. In the cavity of the piston rod 10, the form-fitting devices 12 are introduced in the form of Nutringen, alternatively, the grooves in the piston rod 10 may be incorporated. Furthermore, the grooves can be designed as a thread (trapezoidal thread or the like), for example as an internal thread within the piston rod 10. The positive locking elements can be designed as external threads on the expansion sleeve 20. Within the piston rod 10 and within the grooved rings 12, the holder 20 is guided, which is designed as a tube. In the holder 20, a pull and lock sleeve 45 is slidably mounted. Within the pull and lock sleeve 45, a tie rod 43 is mounted, which is loaded via a coil spring 45 in the direction of the cylinder-side end of the holder 20. At the piston rod side end of the holder 20 is in the FIG. 3 formed spreading sleeve, which is encompassed by the front end of the tie rod 43. The front end of the tie rod 43 is provided with a clamping cone, which displaces the counter-cone 23 by applying an axial force radially inwardly, so that the outer diameter of the expansion sleeve 20 is reduced. As a result, the form-locking elements 22 are brought out of engagement with the form-locking devices 12, so that the piston rod 10 is axially freely movable.

In der Figur 5 ist die Einzelheit D der Figur 4 gezeigt, anhand der zu erkennen ist, dass der Spannkonus 40 als Betätigungseinrichtung den Gegenkonus 23 der Spreizhülse 20 radial nach innen verlagert. In diesem Zustand ist die Spreizhülse 20 gespannt und der Linearaktuator 1 ist frei beweglich. Wird die axiale Haltekraft auf die Zug- und Verriegelungshülse 45 eliminiert, indem eine Haltevorrichtung 99, wie sie in der Figur 2 angedeutet ist, gelöst wird, wird aufgrund der Radialspannung der geschlitzten Abschnitte 21 der Spreizhülse 20 durch Wirkung des Gegenkonus 23 auf den Spannkonus 40 der Zuganker 43 in Richtung auf die Kolbenstange 10 verschoben. Die Spreizhülse 20 entspannt sich und die geschlitzten Abschnitte 21 federn radial nach außen. Dadurch treten die Formschlusselemente 22 mit den Formschlusseinrichtungen 12 in Eingriff und verriegeln die Kolbenstange 10 in dieser Position. Die Klinken oder die Vorsprünge 22 pressen sich durch die Eigenspannungen, hervorgerufen durch die Federwirkung der geschlitzten Abschnitte 21, sowie durch die durch die Schraubenfeder belastete Zug- und Verriegelungshülse 45, die auf die Innenflanke der noch nach innen verformten Spreizhülse 20 eine Keilwirkung ausübt, an die Nutenringe 12. Sofern die Nuten und die Vorsprünge bzw. Klinken einander gegenüberliegen, erfolgt ein Einrasten. Nach dem Einrasten der Formschlusselemente 22 in den Nutenringen 12 liegt eine zylindrische Geometrie innerhalb der geschlitzten Abschnitte 21 der Spreizhülse 20 vor. Nun wird die zylindrische Zug- und Verriegelungshülse 45, durch die gespannte Schraubenfeder 44 getrieben, vollständig in den geschlitzten Bereich der Spreizhülse 20 verschoben. Dabei stützt sich die Zug- und Verriegelungshülse 45 über die Schraubenfeder 44 am Zuganker 43, über den Spannkonus 240 und den Gegenkonus 23 axial am Gegenkonus 23 ab. Ein Zurückrutschen der Zug- und Verriegelungshülse wird somit verhindert. Dadurch wird verhindert, dass die geschlitzten Abschnitte 21 der Spreizhülse 20 nach innen knicken. Zum Entriegeln der Verriegelung wird die Zug- und Verriegelungshülse 45 in die entgegengesetzte Richtung, also in Richtung auf den Zylinder 30, verfahren, die Schraubenfeder 44 wird vorgespannt. Dann wird der Zuganker 43 formschlüssig durch die Zug- und Verriegelungshülse 45 mitbewegt, der Spannkonus 40 tritt in Eingriff mit dem Gegenkonus 23 und verlagert die geschlitzten Abschnitte 21 radial nach innen. Dadurch werden die Formschlusselemente 22 außer Eingriff mit den Formschlusseinrichtungen 12 gebracht und die Verstelleinrichtung 1 ist axial frei beweglich.In the FIG. 5 is the detail D the FIG. 4 shown, can be seen from the fact that the clamping cone 40 as an actuator displaces the counter-cone 23 of the expansion sleeve 20 radially inwardly. In this state, the expansion sleeve 20 is stretched and the linear actuator 1 is free movable. If the axial holding force on the pull and lock sleeve 45 is eliminated by a holding device 99, as shown in the FIG. 2 is indicated is released, is moved due to the radial stress of the slotted portions 21 of the expansion sleeve 20 by action of the mating cone 23 on the clamping cone 40 of the tie rod 43 in the direction of the piston rod 10. The expansion sleeve 20 relaxes and the slotted portions 21 spring radially outward. As a result, the form-fitting elements 22 engage with the form-locking devices 12 and lock the piston rod 10 in this position. The pawls or the projections 22 are pressed by the residual stresses caused by the spring action of the slotted portions 21, as well as by the tensile and locking sleeve 45 loaded by the helical spring, which exerts a wedging action on the inner flank of the expansion sleeve 20, which is still deformed inwardly the Nutenringe 12. If the grooves and the projections or pawls facing each other, there is a snap. After the engagement of the form-locking elements 22 in the Nutenringen 12 is a cylindrical geometry within the slotted portions 21 of the expansion sleeve 20 before. Now, the cylindrical pull and lock sleeve 45, driven by the tensioned coil spring 44, completely moved into the slotted region of the expansion sleeve 20. In this case, the tension and locking sleeve 45 is supported via the coil spring 44 on the tie rod 43, via the clamping cone 240 and the counter-cone 23 axially on the counter-cone 23 from. Slipping back of the pull and lock sleeve is thus prevented. This prevents the slotted portions 21 of the expansion sleeve 20 to buckle inward. To unlock the lock, the pull and lock sleeve 45 in the opposite direction, ie in the direction of the cylinder 30, moved, the coil spring 44 is biased. Then, the tie rod 43 is positively moved by the pulling and locking sleeve 45, the clamping cone 40 engages with the mating cone 23 and displaces the slotted portions 21 radially inwardly. As a result, the positive-locking elements 22 brought out of engagement with the form-locking devices 12 and the adjusting device 1 is axially freely movable.

Die Verriegelungsvorrichtung kann überall dort eingesetzt werden, wo eine axiale Bewegung reversibel, formschlüssig und möglichst über den gesamten Hub blockiert werden muss. Durch die Anordnung der Nutenringe 12 hintereinander ist eine außerordentlich feine Abstufung der formschlüssigen Verriegelung möglich. Durch die innerhalb des Zylinders 30 angeordnete Verriegelungsvorrichtung ist ein sehr guter Schutz vor äußeren Einflüssen gegeben. Das gesamte System ist geschlossen, so dass eine Beschädigung aufgrund äußerer Einflüsse nahezu ausgeschlossen ist. Die reversible Verriegelung an diskreten Positionen über den gesamten Hub der Verstelleinrichtung 1 ist gewährleistet, so dass auch für sicherheitskritische Anwendungen eine Einsatzmöglichkeit besteht. Die Betätigung der Zug- und Verriegelungshülse 45 kann durch die Zentralbohrung 25 des Halters 20 erfolgen, beispielsweise hydraulisch oder elektromotorisch. Ebenfalls ist eine Notfallbetätigung durch eine Zündkapsel möglich.The locking device can be used anywhere where an axial movement must be reversible, positive and possibly blocked over the entire stroke. The arrangement of the Nutenringe 12 in succession an extremely fine gradation of the interlocking locking is possible. By arranged within the cylinder 30 locking device is given a very good protection against external influences. The entire system is closed, so that damage due to external influences is almost impossible. The reversible locking at discrete positions over the entire stroke of the adjusting device 1 is ensured, so that there is also a possibility for safety-critical applications. The operation of the pull and lock sleeve 45 can be done by the central bore 25 of the holder 20, for example hydraulically or by electric motor. Also, an emergency operation by a primer is possible.

Alternativ zu einer hydraulischen Verstelleinrichtung können sämtliche Linearaktuatoren damit ausgerüstet werden. Anstatt der dargestellten Version der außer Eingriff gehaltenen Formschlusselemente 22 ist es vorgesehen, den Spannkonus so auszubilden, dass er die Spreizhülse 20 aufweitet. Ebenfalls ist es möglich, dass innerhalb der Spreizhülse 20 oder des Halters verschieblich gelagerte Klinken oder Segmente angeordnet sind, die formschlüssig in Eingriff mit den Formschlusseinrichtungen 12 gebracht werden, indem diese federgelagerten Segmente durch einen Konus nach außen gedrückt werden. Falls Federringe verwendet werden, können diese analog außer Eingriff gehalten werden und bei Bedarf entriegelt werden.As an alternative to a hydraulic adjusting device, all linear actuators can be equipped with it. Instead of the illustrated version of the disengaged form-locking elements 22, it is provided to form the clamping cone so that it expands the expansion sleeve 20. It is also possible that within the expansion sleeve 20 or the holder displaceably mounted pawls or segments are arranged, which are positively brought into engagement with the Formschlusseinrichtungen 12 by these spring-loaded segments are pressed by a cone to the outside. If spring washers are used, these can be analogously disengaged and unlocked if necessary.

Claims (10)

  1. Locking device for linear actuators, in particular for fluid-actuated adjusting devices, with a piston rod (10) mounted in an axially displaceable manner relative to a receiving device (30), where the piston rod (10) has a hollow space (11) extending in the axial direction, within which form-fitting devices (12) are arranged distributed in the axial direction, and form-fitting element (22) corresponding to the form-fitting devices (12) are arranged in the piston rod (10) in a radially displaceable manner, which elements are mounted in an axially stationary manner relative to the receiving device (30) and where an actuating device (40) in the shape of an axially displaceable gripping cone (40) that displaces the form-fitting elements (22) radially is assigned to the form-fitting elements (22), characterized in that a mating cone (23) complementary to the gripping cone (40) is embodied on the spreader sleeve (20), via which mating cone (23) the form-fitting elements (22) are held disengaged from the form-fitting devices (12).
  2. Locking device according to claim 1, characterized in that the form-fitting devices (12) are grooves.
  3. Locking device according to claim 1 or 2, characterized in that the form-fitting devices (12) are groove rings that are arranged behind one another in the piston rod (10).
  4. Locking device according to one of the preceding claims, characterized in that the receiving device (30) is a cylinder in which a piston (31) fixed to the piston rod (10) is mounted displaceably.
  5. Locking device according to one of the preceding claims, characterized in that the form-fitting elements (22) are embodied or mounted radially spring-mounted.
  6. Locking device according to one of the preceding claims, characterized in that the form-fitting elements (22) are projections arranged or embodied on a holder (20), segments mounted displaceably, or spring washers embodied radially spring-mounted.
  7. Locking device according to claim 6, characterized in that the holder (20) is embodied as a spreader sleeve that is slotted in the axial direction and the form-fitting elements (22) are arranged on the slotted sections (21).
  8. Locking device according to claim 6 or 7, characterized in that the form-fitting elements (22) are mounted on the holder (20) in an axially stationary manner relative to the receiving device, and the holder (20) is enclosed by the piston rod (10) at least in the area of the form-fitting elements (22).
  9. Locking device according to one of claims 6 to 8, characterized in that a tension- and locking sleeve (45) that prevents an escape of the form-fitting elements (22) radially inwards is arranged inside the spreader sleeve (40).
  10. Locking device according to claim 9, characterized in that the gripping cone (40) is coupled with the tension- and locking sleeve (45) via a spring-loaded tension anchor (43).
EP05774023A 2004-08-11 2005-08-11 Locking mechanism for linear actuators Not-in-force EP1776527B1 (en)

Applications Claiming Priority (2)

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DE102004039092A DE102004039092B4 (en) 2004-08-11 2004-08-11 Locking device for linear actuators
PCT/DE2005/001420 WO2006015587A1 (en) 2004-08-11 2005-08-11 Locking mechanism for linear actuators

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EP1776527A1 EP1776527A1 (en) 2007-04-25
EP1776527B1 true EP1776527B1 (en) 2010-05-05

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US (1) US7908961B2 (en)
EP (1) EP1776527B1 (en)
AT (1) ATE467054T1 (en)
BR (1) BRPI0514304A (en)
CA (1) CA2575183A1 (en)
DE (2) DE102004039092B4 (en)
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DE29503736U1 (en) * 1995-03-04 1995-04-27 Schirbel Norbert Positioning device for the exact positioning of pneumatic and hydraulic working cylinders
DE19507689C2 (en) * 1995-03-04 1997-02-13 Norbert Schirbel Positioning device for precise positioning of pneumatic or hydraulic working cylinders
US5685141A (en) * 1995-12-26 1997-11-11 General Electric Company Lock for nozzle control in the event of hydraulic failure
DE19806501C1 (en) * 1998-02-17 1999-08-19 Mannesmann Sachs Ag Vibration damper in a vehicle shock absorber system
JP2004322735A (en) * 2003-04-22 2004-11-18 Nhk Spring Co Ltd Actuator

Also Published As

Publication number Publication date
DE102004039092B4 (en) 2008-04-24
WO2006015587A1 (en) 2006-02-16
US20080022849A1 (en) 2008-01-31
BRPI0514304A (en) 2008-06-10
EP1776527A1 (en) 2007-04-25
DE502005009534D1 (en) 2010-06-17
DE102004039092A1 (en) 2006-02-23
CA2575183A1 (en) 2006-02-16
US7908961B2 (en) 2011-03-22
ATE467054T1 (en) 2010-05-15
ES2342475T3 (en) 2010-07-07

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