EP3344881A1 - Hydromechanical blocking cylinder and hydraulic control system for actuating same - Google Patents

Hydromechanical blocking cylinder and hydraulic control system for actuating same

Info

Publication number
EP3344881A1
EP3344881A1 EP17791292.0A EP17791292A EP3344881A1 EP 3344881 A1 EP3344881 A1 EP 3344881A1 EP 17791292 A EP17791292 A EP 17791292A EP 3344881 A1 EP3344881 A1 EP 3344881A1
Authority
EP
European Patent Office
Prior art keywords
locking
piston
valve
cylinder according
locking part
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP17791292.0A
Other languages
German (de)
French (fr)
Other versions
EP3344881B1 (en
Inventor
Norbert Beinl
Hubert Reiser
Rainer Schenk
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.)
Fbr Facondrehteile GmbH
Original Assignee
Fbr Facondrehteile GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fbr Facondrehteile GmbH filed Critical Fbr Facondrehteile GmbH
Publication of EP3344881A1 publication Critical patent/EP3344881A1/en
Application granted granted Critical
Publication of EP3344881B1 publication Critical patent/EP3344881B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • F15B15/20—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
    • 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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/003—Systems with load-holding valves
    • 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
    • F15B15/262—Locking mechanisms using friction, e.g. brake pads
    • F15B15/264—Screw mechanisms attached to the piston
    • 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
    • F15B15/28—Means for indicating the position, e.g. end of stroke
    • F15B15/2815—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT
    • F15B15/2861—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT using magnetic means
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/3052—Shuttle valves
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40576—Assemblies of multiple valves
    • F15B2211/40584—Assemblies of multiple valves the flow control means arranged in parallel with a check valve
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/415—Flow control characterised by the connections of the flow control means in the circuit
    • F15B2211/41527—Flow control characterised by the connections of the flow control means in the circuit being connected to an output member and a directional control valve
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/42—Flow control characterised by the type of actuation
    • F15B2211/428—Flow control characterised by the type of actuation actuated by fluid pressure

Definitions

  • the invention relates to a hydromechanical locking cylinder - which is also referred to as a locking cylinder - according to the preamble of claim 1 and a hydraulic control system for its actuation according to claim 12.
  • a generic hydromechanical locking cylinder is from the
  • EP 1 864 024 B1 a rotary sleeve connected to a spindle for locking the spindle is secured by radially engaging locking pin.
  • the locking pins are biased by compression springs into their engaged position and disengaged by acting on the locking pin pressure medium.
  • the object of the invention is to provide a hydromechanical locking cylinder with a simplified structure. Another object is to provide a hydraulic control system for easy operation, in particular of the locking cylinder according to the invention.
  • the locking cylinder according to the invention is characterized in that in a one-piece design or firmly connected two-part design of the spindle with a locking part of the locking engagement by means of at least one frontally arranged on the locking part, radially and axially open Arret michsnut the front side with fixed locking bolt.
  • no moving parts are required between the spindle and locking part.
  • the frontal engagement allows a sliding, low-wear locking or unlocking by means of only a very slight axial lifting movement of the locking part.
  • the detent grooves provided for this purpose on the locking part are preferably provided with at least one chamfering and directly adjoin one another in such a way that locking pins provided in the region of a cylinder bottom engage in each rotational position of the spindle even with very little rotation. This ensures a quick and low-wear inlet and outlet of the locking bolt in the locking grooves.
  • the locking grooves are chamfered on both sides, so that the engagement and disengagement of the locking bolt takes place equally easily in both directions of rotation.
  • three locking bolts are arranged at 120 ° offset on the cylinder bottom.
  • the number of locking grooves on the locking part is preferably a natural multiple of the number of locking bolts, that is, for example, preferably six or better even nine locking grooves in the case of three locking bolts.
  • the locking cylinder according to the invention has a separate from a working space for actuating the piston unlocking pressure chamber in the region of the front end of the locking part.
  • a suitable in particular for the actuation of the hydromechanical locking cylinder according to the invention hydraulic control system provides that a valve for acting on the working space is only then acted upon by the required working pressure for lifting the piston when the locking member is lifted by the pressure in the unlocking pressure chamber of the locking bolt.
  • a valve for acting on the working pressure chamber is in opposite directions coupled with a valve for acting on or relieving the unlocking gelungs pressure chamber.
  • all valves used for actuating the piston and the locking part are in a hydraulic control block integrated, which is preferably flanged on the outer casing or housing of the locking cylinder.
  • the locking cylinder according to the invention can be designed as a single-acting plunger cylinder but also as a double-acting cylinder. Described is in the embodiments, only a single-acting locking cylinder. For a conversion into a double-acting cylinder, the working pressure chamber in the upper area only needs to be connected to another hydraulic line.
  • Fig. 2 is a side view of a locking part chastised on one side
  • FIG. 3 is a side view of an alternative locking member with both sides chamfered locking grooves
  • Fig. 4 is a perspective view of the locking member according to Figure 3.
  • Fig. 5 is a schematic representation of a locking cylinder with an associated hydraulic control system.
  • a locking cylinder 10 shown in FIG. 1 is formed by a cylinder tube 12 which is closed at the top by a closing part 11 and at the bottom by a bottom 14.
  • the end part 1 1 is screwed by means of a thread 1 1 10 with the cylinder tube 12 and additionally sealed by means of a seal 1 1 12.
  • a housing 14 including the bottom 14 wherein the connection also preferably via a unspecified screw thread and an additional seal by means of at least one unspecified seal is done.
  • a needle bearing 33 covered upwardly by a support disk 330 is inserted when screwing in.
  • a fastening eye 15 is designed for connection, for example, to a machine frame, to a vehicle frame or to a foundation.
  • a tubular piston rod 20 is arranged, which is provided at its lower end with a piston 22.
  • the upper end of the piston rod 20 is provided with a mounting eye 21.
  • the piston 22 has an internal thread 23 that is in engagement with an external thread 31 of a spindle 30 arranged centrally in the cylinder tube 12.
  • the thread 23 or 31 is preferably designed as a trapezoidal thread.
  • the spindle 30 is fixedly connected to a locking part 32 that connects down to this.
  • the locking member 32 has on its downwardly directed end side a plurality of radially outwardly open and also in the axial direction downwardly open locking grooves 34.
  • the locking grooves 34 are in Figure 1 with locking pin 18 in engagement, which are fixedly arranged above the bottom 14 substantially horizontally laterally in the housing 19.
  • the locking grooves 34 are shown in detail in Figures 2 to 4.
  • the locking part 32 is axially movable in an unlocking pressure space 1 6 separate from the working pressure chamber 24 when it is acted upon by means of an unlocking pressure such that the locking grooves 34 can disengage from the locking bolts 18.
  • the underside of the needle bearing 33 forms a rotatable stop for the locking part 32.
  • the locking part 32 allows a rotation of the spindle 30 to, which causes an axial displacement of the piston 22 and the piston rod 20 upward due to the hydraulic pressure in the working pressure chamber 24 and the engagement of the external thread 31 in the internal thread 23. 2, a locking member 32 is shown in detail.
  • FIG. 3 shows an alternative embodiment of a locking part 32 in which the locking grooves 34 are provided with chamfers 36 on both sides. This embodiment is preferred because the engagement of the locking pin 18 or disengaged with the locking pin 18 in both directions is sliding.
  • nine locking grooves 34 are arranged uniformly distributed on the circumference. In this case, three offset by 120 ° to each other arranged locking pin 18 for engagement in these locking grooves 34 are provided.
  • the piston 22 thus performs at a locking of the locking member 32 only a maximum of 1/9 of a pitch of its thread as expiring axial movement. These are in practice only a few millimeters.
  • FIG. 4 schematically indicates a bypass bore 35 which is also present in the embodiment according to FIG.
  • This at least one bypass bore provided in the locking part 32 communicates with an inlet opening 35X arranged in the region of the locking grooves 34 with the unlocking pressure chamber 16 arranged below the first seal 161.
  • the outlet opening 35S provided laterally on the locking part 32 is in the locking position. locked on by the wall. After lifting off the locking part 32 of the locking pin 18, the outlet opening 35 S communicates with the hydraulic line S, so that the pressure in the unlocking pressure chamber 1 6 pending on the pressure acting as a control pressure line hydraulic line S for controlling the valves 1 10 and 120 is effective.
  • Fig. 5 the locking cylinder 10 is shown only schematically in the left part. Below the piston 22, the working pressure chamber 24 can be seen, in which a first hydraulic line A with a line branch A1 10 opens.
  • a first hydraulic line A with a line branch A1 10 opens.
  • these confluence parts is indicated only schematically by the arrow A.
  • a hydraulic line X and between the first seal 1 61 and the second seal 1 62 opens a further hydraulic line S.
  • these confluence parts are indicated only schematically by the arrow X and S.
  • the hydraulic lines A, X and S are controlled by a hydraulic control block 102 shown schematically in the right-hand part of FIG. 5, which forms a hydraulic control system 100 in conjunction with a multi-way valve 105 and the hydraulic lines A and B controlled by it.
  • the hydraulic control block 102 is flanged to the right side of the housing 19 in FIG.
  • the first valve 1 10 is connected on the right side via a branch line A1 10 with the first hydraulic line A.
  • the first valve 1 10 is connected on the left side via the branch line A1 12 with the working pressure chamber 24.
  • the first valve 1 10 is connected to the hydraulic line S and on its upper side, the first valve 1 10 via a control line 1 18 connected to the second valve 120, wherein the control line 1 18 a mutually opposite circuit of the valves 1 10 and 120 causes.
  • the second valve 120 is connected on its left side via a branch line B120 with the second hydraulic line B.
  • the second valve 120 is connected via a line branch B130 to the third valve 130, which on the input side has a shuttle valve 134 in this area, which inhibits or releases flow to the line branch B130.
  • the line branch B120 and the line branch B130 are additionally connected to one another by a bypass line 124 which bypasses the second valve 120 and into which a check valve 122 blocking the flow to the line branch B130 is inserted.
  • the third valve 130 is connected at its bottom via a check valve 132 with the first hydraulic line A, wherein the check valve 132 allows only a flow from the first hydraulic line A to the third valve 130. On its left side, the third valve 130 is connected to the unlocking pressure chamber 1 6 leading hydraulic line X.
  • the first hydraulic line A is pressurized.
  • the third valve 130 controls this pressure in the hydraulic line X, whereby the check valve 132 opens and the shuttle valve 134 blocks the path to the branch line 132.
  • the hydraulic line S is in this case still depressurized, so that the first valve 1 10 nor the connection from the line branch A1 10 to the line branch A1 12 stops. Therefore, starting from the hydraulic line A, initially only one unlocking pressure in the unlocking pressure chamber 16 is built up, but still no pressure in the working pressure chamber 24. The unlocking is thus unequivocally uncoupled from the working stroke.
  • the unlocking pressure fed in via the hydraulic line X into the unlocking pressure chamber 16 causes the locking part 32 to be lifted off the locking bolt 18.
  • the bypass bore 35 and its released outlet opening 35S also act as the control pressure line Hydraulic line S is acted upon by the unlocking pressure.
  • the second hydraulic line B is pressurized by the multi-way valve 105 and the first hydraulic line A is simultaneously relieved.
  • the pressure is fed via the third valve 130 into the hydraulic line X.
  • the hydraulic line S is also subjected to pressure simultaneously via the unlocking pressure chamber 16.
  • This pressure causes a reversal of the first valve 1 10 and at the same time via the control line 1 18 and a reversing of the second valve 120.
  • only as much pressure is built up, as it is needed to lift the load.
  • the mechanical lock immediately acting on the lock engaging with the locking pin 18 locking grooves 34 ensures safe interception of the load in any intermediate position.
  • the bypass line 122 with the opening check valve 122 provides for a controlled pressure reduction after completion of a lifting or lowering operation.
  • the pressure present in the unlocking pressure chamber 16 is thereby reduced via the hydraulic line X, via the third valve 130 with its now upwardly opening shuttle valve 134 and via the bypass line 122 to the then pressureless hydraulic line B120 and B.
  • the inventive hydraulic control system 100 also provides in a simple manner for a very advantageous, minimizing the wear decoupling of the unlocking process from the working stroke of a hydromechanical locking cylinder.
  • A1 10 line branch (from A to the first valve 1 10)
  • A1 12 Line branch (from the first valve 1 10 to the working pressure chamber)
  • A130 line branch (from multiway valve 105 to first valve 1 10)

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

The invention relates to a hydromechanical blocking cylinder (10) comprising a piston (22) which can be hydraulically actuated in a cylindrical tube (112) and a threaded portion (23) of which engages a threaded portion (31) on a spindle (30), wherein the spindle (30) can be blocked by means of a locking element (32) to interrupt a movement of the piston (22). According to the invention, the spindle (30) and the locking element (32) are integrally formed or fixedly connected to each other and the locking element (32) can engage at least one stationary locking pin (18) by means of at least one blocking groove (34) on the end face of the locking element. The invention further relates a hydraulic control system (100) which is particularly designed for actuating such a blocking cylinder (10).

Description

Hydromechanischer Arretierungszylinder und hydraulisches Steuersystem zu dessen Betätigung  Hydromechanical locking cylinder and hydraulic control system for its operation
Die Erfindung betrifft einen hydromechanischen Arretierungszylinder - der auch als Verriegelungszylinder bezeichnet wird - gemäß dem Oberbegriff des An- Spruchs 1 und ein hydraulisches Steuersystem zu dessen Betätigung gemäß Anspruch 12. The invention relates to a hydromechanical locking cylinder - which is also referred to as a locking cylinder - according to the preamble of claim 1 and a hydraulic control system for its actuation according to claim 12.
Ein gattungsgemäßer hydromechanischer Arretierungszylinder ist aus der A generic hydromechanical locking cylinder is from the
EP 1 864 024 B1 bekannt. Hierbei wird eine mit einer Spindel verbundene Drehhülse zur Arretierung der Spindel durch radial eingreifende Sperrbolzen gesichert. Die Sperrbolzen werden durch Druckfedern in ihre Eingriffsstellung vorgespannt und durch ein auf den Sperrbolzen einwirkendes Druckmedium außer Eingriff gebracht. EP 1 864 024 B1. Here, a rotary sleeve connected to a spindle for locking the spindle is secured by radially engaging locking pin. The locking pins are biased by compression springs into their engaged position and disengaged by acting on the locking pin pressure medium.
Aufgabe der Erfindung ist es, einen hydromechanischen Arretierungszylinder mit einem vereinfachten Aufbau zu schaffen. Eine weitere Aufgabe besteht darin, ein hydraulisches Steuersystem für eine einfache Betätigung insbesondere des erfindungsgemäßen Arretierungszylinders bereitzustellen. The object of the invention is to provide a hydromechanical locking cylinder with a simplified structure. Another object is to provide a hydraulic control system for easy operation, in particular of the locking cylinder according to the invention.
Diese Aufgabe wird erfindungsgemäß bezüglich des Arretierungszylinders durch die Merkmale des Anspruchs 1 und bezüglich des hydraulischen Steuersystems bezüglich des Anspruchs 1 2 gelöst. Vorteilhafte Ausgestaltungen der Erfindung sind in den darauf bezogenen Unteransprüchen angegeben. Mit der vorliegenden Erfindung wird ein äußerst einfacher Aufbau eines äußerst zuverlässig arbeitenden Arretierungszylinders mit nur sehr wenigen Teilen möglich. Als bevorzugtes Einsatzgebiet der Erfindung können beispielsweise hydrau- lisch betätigbare Hub-Plattformen oder Arbeitsbühnen oder andere statische Lastfälle in Betracht kommen. Durch die zusätzliche mechanische Verriegelung wird die Betriebssicherheit des erfindungsgemäßen Arretierungszylinders gegenüber Systemen, die ausschließlich mit einer hydraulischen Blockierung eines erreichten Bewegungszustandes arbeiten, insbesondere bei solchen statischen Anwendun- gen, bei denen eine Last sehr lange stabil gehalten werden muss, wesentlich verbessert. This object is achieved with respect to the locking cylinder by the features of claim 1 and with respect to the hydraulic control system with respect to claim 1 2. Advantageous embodiments of the invention are specified in the related subclaims. With the present invention, an extremely simple construction of a highly reliable locking cylinder with only a few parts is possible. For example, hydraulically operable lifting platforms or work platforms or other static load cases may be considered as a preferred field of application of the invention. As a result of the additional mechanical locking, the operational safety of the locking cylinder according to the invention is substantially improved compared to systems which work exclusively with a hydraulic blocking of an achieved movement state, in particular in those static applications in which a load must be kept stable for a very long time.
Der erfindungsgemäße Arretierungszylinder zeichnet sich dadurch aus, dass bei einer einteiligen Ausbildung oder fest verbundenen zweiteiligen Ausbildung der Spindel mit einem Verriegelungsteil der Verriegelungseingriff mittels wenigstens einer stirnseitig am Verriegelungsteil angeordneten, radial und axial offenen Arretierungsnut stirnseitig mit feststehenden Verriegelungsbolzen erfolgt. Somit sind zwischen Spindel und Verriegelungsteil keine bewegten Teile erforderlich. Es sind auch keine bewegbaren Verriegelungsbolzen erforderlich. Der stirnseitige Eingriff ermöglicht eine gleitende, verschleißarme Verriegelung bzw. Entriegelung mittels einer nur sehr geringfügigen axialen Hubbewegung des Verriegelungsteils. The locking cylinder according to the invention is characterized in that in a one-piece design or firmly connected two-part design of the spindle with a locking part of the locking engagement by means of at least one frontally arranged on the locking part, radially and axially open Arretierungsnut the front side with fixed locking bolt. Thus, no moving parts are required between the spindle and locking part. There are also no movable locking bolt required. The frontal engagement allows a sliding, low-wear locking or unlocking by means of only a very slight axial lifting movement of the locking part.
Die dazu am Verriegelungsteil vorgesehenen Arretierungsnuten sind bevorzugt mit wenigstens einer Anfasung versehen und schließen derart unmittelbar anei- nander an, dass im Bereich eines Zylinderbodens vorgesehene Verriegelungsbolzen in jeder Drehposition der Spindel auch bei einer nur sehr geringen Drehung in Eingriff geraten. Dadurch wird ein schneller und verschleißarmer Einlauf und Auslauf der Verriegelungsbolzen in die Arretierungsnuten gewährleistet. Eine einseitige Belastung eines einzigen Verriegelungsbolzens und die damit einhergehende Gefahr eines Brechens und Verklemmens, wie sie bei einem Eingriff mehrerer radial bewegbarer Verriegelungsbolzens (siehe EP 1 864 024 B1 ) durch einen minimalen Versatz bei deren Bewegung immer wieder vorkommen, ist beim erfin- dungsgemäßen Arretierungszylinder ausgeschlossen. Dadurch wird dessen Betriebssicherheit wesentlich erhöht. The detent grooves provided for this purpose on the locking part are preferably provided with at least one chamfering and directly adjoin one another in such a way that locking pins provided in the region of a cylinder bottom engage in each rotational position of the spindle even with very little rotation. This ensures a quick and low-wear inlet and outlet of the locking bolt in the locking grooves. A one-sided loading of a single locking bolt and the associated risk of breakage and jamming, as they repeatedly occur in the event of an engagement of a plurality of radially movable locking bolt (see EP 1 864 024 B1) by a minimal offset during their movement, is Locking cylinder according to the invention excluded. As a result, its reliability is significantly increased.
In einer besonders bevorzugten Ausführungsform sind die Arretierungsnuten beidseitig mit Anfasung versehen, so dass das in Eingriff und außer Eingriff bringen der Verriegelungsbolzen in beiden Drehrichtungen gleichermaßen einfach stattfindet. In a particularly preferred embodiment, the locking grooves are chamfered on both sides, so that the engagement and disengagement of the locking bolt takes place equally easily in both directions of rotation.
In einer bevorzugten Ausführungsform sind drei Verriegelungsbolzen unter 120 ° versetzt am Zylinderboden angeordnet. Die Zahl der Arretierungsnuten am Verriegelungsteil beträgt bevorzugt ein natürliches Vielfaches der Zahl der Verriegelungsbolzen, bei drei Verriegelungsbolzen also beispielsweise bevorzugt sechs oder besser sogar neun Arretierungsnuten. Der erfindungsgemäße Arretierungszylinder weist einen von einem Arbeitsraum zum Betätigen des Kolbens getrennten Entriegelungs-Druckraum im Bereich des stirnseitigen Endes des Verriegelungsteils auf. In a preferred embodiment, three locking bolts are arranged at 120 ° offset on the cylinder bottom. The number of locking grooves on the locking part is preferably a natural multiple of the number of locking bolts, that is, for example, preferably six or better even nine locking grooves in the case of three locking bolts. The locking cylinder according to the invention has a separate from a working space for actuating the piston unlocking pressure chamber in the region of the front end of the locking part.
Ein insbesondere zur Betätigung des erfindungsgemäßen hydromechanischen Arretierungszylinders geeignetes hydraulisches Steuersystem sieht vor, dass ein Ventil zur Beaufschlagung des Arbeitsraumes erst dann mit dem erforderlichen Arbeitsdruck zum Anheben des Kolbens beaufschlagt wird, wenn das Verriegelungsteil durch den Druck im Entriegelungs-Druckraum von den Verriegelungsbolzen abgehoben ist. A suitable in particular for the actuation of the hydromechanical locking cylinder according to the invention hydraulic control system provides that a valve for acting on the working space is only then acted upon by the required working pressure for lifting the piston when the locking member is lifted by the pressure in the unlocking pressure chamber of the locking bolt.
In einer vorteilhaften Ausführungsform des hydraulischen Steuersystems ist hierfür ein Ventil zur Beaufschlagung des Arbeitsdruckraums gegenläufig bewegungsgekoppelt mit einem Ventil zur Beaufschlagung oder Entlastung des Entrie- gelungs-Druckraumes. In an advantageous embodiment of the hydraulic control system for this purpose a valve for acting on the working pressure chamber is in opposite directions coupled with a valve for acting on or relieving the unlocking gelungs pressure chamber.
In einer weiteren vorteilhaften Ausgestaltung sind alle zur Betätigung des Kolbens und des Verriegelungsteils dienenden Ventile in einem hydraulischen Steuerblock integriert, der bevorzugt am Außenmantel oder Gehäuse des Arretierungszylinders anflanschbar ist. In a further advantageous embodiment, all valves used for actuating the piston and the locking part are in a hydraulic control block integrated, which is preferably flanged on the outer casing or housing of the locking cylinder.
Der erfindungsgemäße Arretierungszylinder kann als einfach wirkender Plunger- zylinder aber auch als doppeltwirkender Arbeitszylinder ausgestaltet sein. Beschrieben ist in den Ausführungsbeispielen nur ein einfach wirkender Arretierungszylinder. Für eine Umgestaltung in einen doppeltwirkenden Arbeitszylinder muss der Arbeitsdruckraum im oberen Bereich lediglich mit einer weiteren Hydraulikleitung verbunden werden. The locking cylinder according to the invention can be designed as a single-acting plunger cylinder but also as a double-acting cylinder. Described is in the embodiments, only a single-acting locking cylinder. For a conversion into a double-acting cylinder, the working pressure chamber in the upper area only needs to be connected to another hydraulic line.
Nachfolgend werden Ausführungsbeispiele des erfindungsgemäßen Arretierungszylinders näher erläutert. Es zeigt: Embodiments of the locking cylinder according to the invention will be explained in more detail. It shows:
Fig. 1 einen Längsschnitt durch einen einfach wirkenden Arretierungszylinder bei eingefahrenem Kolben und im Eingriff befindlichen Verriegelungsteil, 1 shows a longitudinal section through a single-acting locking cylinder with retracted piston and engaged locking part,
Fig. 2 eine Seitenansicht eines Verriegelungsteils mit einseitig angefasten  Fig. 2 is a side view of a locking part chastised on one side
Arretierungsnuten,  locking grooves,
Fig. 3 eine Seitenansicht eines alternativen Verriegelungsteils mit beidseitig angefasten Arretierungsnuten,  3 is a side view of an alternative locking member with both sides chamfered locking grooves,
Fig. 4 eine perspektivische Ansicht des Verriegelungsteils gemäß Figur 3, und  Fig. 4 is a perspective view of the locking member according to Figure 3, and
Fig. 5 eine schematische Darstellung eines Arretierungszylinders mit einem dazugehörigen hydraulischen Steuersystem.  Fig. 5 is a schematic representation of a locking cylinder with an associated hydraulic control system.
Ein in Fig. 1 dargestellter Arretierungszylinder 10 wird gebildet von einem Zylinderrohr 12, dass oben von einem Abschlussteil 1 1 und unten von einem Boden 14 verschlossen wird. Das Abschlussteil 1 1 ist mittels eines Gewindes 1 1 10 mit dem Zylinderrohr 12 verschraubt und zusätzlich mittels einer Dichtung 1 1 12 abgedichtet. A locking cylinder 10 shown in FIG. 1 is formed by a cylinder tube 12 which is closed at the top by a closing part 11 and at the bottom by a bottom 14. The end part 1 1 is screwed by means of a thread 1 1 10 with the cylinder tube 12 and additionally sealed by means of a seal 1 1 12.
Im unteren Teil ist das Zylinderrohr 12 mit einem auch den Boden 14 umfassenden Gehäuse 19 verbunden, wobei die Verbindung ebenfalls bevorzugt über ein nicht näher bezeichnetes Schraubgewinde und eine zusätzliche Abdichtung mittels wenigstens einer nicht näher bezeichneten Dichtung erfolgt. In the lower part of the cylinder tube 12 is connected to a housing 14 including the bottom 14, wherein the connection also preferably via a unspecified screw thread and an additional seal by means of at least one unspecified seal is done.
Zwischen Zylinderrohr 12 und Gehäuse 19 wird beim Einschrauben ein nach oben von einer Stützscheibe 330 abgedecktes Nadellager 33 eingesetzt. Between cylinder tube 12 and housing 19, a needle bearing 33 covered upwardly by a support disk 330 is inserted when screwing in.
Am unteren Teil des Gehäuses 19 ist ein Befestigungsauge 15 zur Anbindung beispielsweise an ein Maschinengestell, an einen Fahrzeugrahmen oder an ein Fundament ausgebildet. At the lower part of the housing 19, a fastening eye 15 is designed for connection, for example, to a machine frame, to a vehicle frame or to a foundation.
Im Inneren des Zylinderrohres 12 ist eine rohrförmige Kolbenstange 20 angeordnet, die an ihrem unteren Ende mit einem Kolben 22 versehen ist. Das obere Ende der Kolbenstange 20 ist mit einem Befestigung-Auge 21 versehen. Der Kolben 22 weist ein Innengewinde 23 auf, dass mit einem Außengewinde 31 einer zentral im Zylinderrohr 12 angeordneten Spindel 30 im Eingriff steht. Das Gewinde 23 bzw. 31 ist bevorzugt als Bewegungs-Trapezgewinde ausgebildet. Unterhalb des Kolbens 22 begrenzt dieser in Verbindung mit der Innenwand des Zylinderrohres 12 einen Arbeitsdruckraum 24. Die Spindel 30 ist fest mit einem Verriegelungsteil 32 verbunden, dass sich nach unten an diese anschließt. Das Verriegelungsteil 32 weist an seiner nach unten gerichteten Stirnseite mehrere radial nach außen offene und auch in axialer Richtung nach unten offene Arretierungsnuten 34 auf. Die Arretierungsnuten 34 stehen in Figur 1 mit Verriegelungsbolzen 18 im Eingriff, die oberhalb des Bodens 14 im Wesentlichen horizontal seitlich im Gehäuse 19 fest angeordnet sind. Die Arretierungsnuten 34 sind im Detail in den Figuren 2 bis 4 dargestellt. Inside the cylinder tube 12, a tubular piston rod 20 is arranged, which is provided at its lower end with a piston 22. The upper end of the piston rod 20 is provided with a mounting eye 21. The piston 22 has an internal thread 23 that is in engagement with an external thread 31 of a spindle 30 arranged centrally in the cylinder tube 12. The thread 23 or 31 is preferably designed as a trapezoidal thread. Below the piston 22, this limits in connection with the inner wall of the cylinder tube 12 a working pressure chamber 24. The spindle 30 is fixedly connected to a locking part 32 that connects down to this. The locking member 32 has on its downwardly directed end side a plurality of radially outwardly open and also in the axial direction downwardly open locking grooves 34. The locking grooves 34 are in Figure 1 with locking pin 18 in engagement, which are fixedly arranged above the bottom 14 substantially horizontally laterally in the housing 19. The locking grooves 34 are shown in detail in Figures 2 to 4.
Das Verriegelungsteil 32 ist in einem vom Arbeitsdruckraum 24 getrennten Ent- riegelungs-Druckraum 1 6 bei Beaufschlagung desselben mittels eines Entriege- lungsdrucks soweit axial bewegbar, dass die Arretierungsnuten 34 außer Eingriff mit den Verriegelungsbolzen 18 geraten können. Die Unterseite des Nadellagers 33 bildet dabei einen drehbaren Anschlag für das Verriegelungsteil 32. In der Entriegelungsstellung lässt das Verriegelungsteil 32 eine Rotation der Spindel 30 zu, die eine Axialverschiebung des Kolbens 22 und der Kolbenstange 20 nach oben infolge des Hydraulikdrucks im Arbeitsdruckraum 24 und des Eingriffs des Außengewindes 31 in das Innengewinde 23 bewirkt. In Fig. 2 ist ein Verriegelungsteil 32 im Detail dargestellt. Mehrere am Umfang gleichmäßig verteilte Arretierungsnuten 34 weisen in diesem Ausführungsbeispiel einseitig eine Anfasung 36 auf, über die sich das Arretierungsteil 32 bei einer Beaufschlagung mit einem Entriegelungsdruck von den Verriegelungsbolzen 18 abhebt und bei einem umgekehrten Verriegeln wieder gleitend in Eingriff gerät. Das Verriegelungsteil 32 weist im mittleren Bereich mehrere Aussparungen 38 auf. In diesem Bereich ist am Gehäuse 19 ein Magnetschalter 13 angeordnet, der die Anzahl der Umdrehungen des Verriegelungsteils 32 misst und dadurch die exakte Hub-Position des Kolbens 20 bestimmt. Fig. 3 ist eine alternative Ausführungsform eines Verriegelungsteils 32 dargestellt, bei der die Arretierungsnuten 34 beidseitig mit Anfasung 36 versehen sind. Diese Ausführungsform ist bevorzugt, da der Eingriff der Verriegelungsbolzen 18 oder das außer Eingriff geraten mit den Verriegelungsbolzen 18 in beiden Drehrichtungen gleitend erfolgt. Wie der perspektivischen Darstellung gemäß Figur 4 zu ent- nehmen ist, sind im gezeigten Ausführungsbeispiel am Umfang gleichmäßig verteilt neun Arretierungsnuten 34 angeordnet. In diesem Fall sind drei um 120° versetzt zueinander angeordnete Verriegelungsbolzen 18 für den Eingriff in diese Arretierungsnuten 34 vorgesehen. Der Kolben 22 führt somit bei einer Arretierung des Verriegelungsteils 32 nur noch maximal 1/9 einer Ganghöhe seines Gewin- des als auslaufende Axialbewegung durch. Dies sind in der Praxis nur wenige Millimeter. The locking part 32 is axially movable in an unlocking pressure space 1 6 separate from the working pressure chamber 24 when it is acted upon by means of an unlocking pressure such that the locking grooves 34 can disengage from the locking bolts 18. The underside of the needle bearing 33 forms a rotatable stop for the locking part 32. In the unlocked position, the locking part 32 allows a rotation of the spindle 30 to, which causes an axial displacement of the piston 22 and the piston rod 20 upward due to the hydraulic pressure in the working pressure chamber 24 and the engagement of the external thread 31 in the internal thread 23. 2, a locking member 32 is shown in detail. Several on the circumference uniformly distributed locking grooves 34 have in this embodiment on one side a chamfer 36, on which the locking member 32 lifts when subjected to an unlocking of the locking bolt 18 and again slidably engaged in a reverse locking. The locking member 32 has a plurality of recesses 38 in the middle region. In this area, a magnetic switch 13 is arranged on the housing 19, which measures the number of revolutions of the locking part 32 and thereby determines the exact stroke position of the piston 20. FIG. 3 shows an alternative embodiment of a locking part 32 in which the locking grooves 34 are provided with chamfers 36 on both sides. This embodiment is preferred because the engagement of the locking pin 18 or disengaged with the locking pin 18 in both directions is sliding. As can be seen from the perspective illustration according to FIG. 4, in the exemplary embodiment shown, nine locking grooves 34 are arranged uniformly distributed on the circumference. In this case, three offset by 120 ° to each other arranged locking pin 18 for engagement in these locking grooves 34 are provided. The piston 22 thus performs at a locking of the locking member 32 only a maximum of 1/9 of a pitch of its thread as expiring axial movement. These are in practice only a few millimeters.
In Figur 4 ist eine auch bei der Ausführungsform gemäß Fig. 2 vorhandene By- passbohrung 35 schematisch angedeutet. Diese im Verriegelungsteil 32 vorgese- hene wenigstens eine Bypassbohrung kommuniziert mit einer im Bereich der Arretierungsnuten 34 angeordneten Eintrittsöffnung 35X mit dem unterhalb der ersten Dichtung 1 61 angeordneten Entriegelungs-Druckraum 16. Die seitlich am Verriegelungsteil 32 vorgesehene Austrittsöffnung 35S ist in der Verriegelungspositi- on durch Anlage an der Wand gesperrt. Nach dem Abheben des Verriegelungsteils 32 von den Verriegelungsbolzen 18 kommuniziert die Austrittsöffnung 35S mit der Hydraulikleitung S, so dass der im Entriegelungs-Druckraum 1 6 anstehende Druck über die als Steuerdruckleitung wirkende Hydraulikleitung S auch zur Ansteuerung der Ventile 1 10 und 120 wirksam wird. FIG. 4 schematically indicates a bypass bore 35 which is also present in the embodiment according to FIG. This at least one bypass bore provided in the locking part 32 communicates with an inlet opening 35X arranged in the region of the locking grooves 34 with the unlocking pressure chamber 16 arranged below the first seal 161. The outlet opening 35S provided laterally on the locking part 32 is in the locking position. locked on by the wall. After lifting off the locking part 32 of the locking pin 18, the outlet opening 35 S communicates with the hydraulic line S, so that the pressure in the unlocking pressure chamber 1 6 pending on the pressure acting as a control pressure line hydraulic line S for controlling the valves 1 10 and 120 is effective.
In der Fig. 5 ist der Arretierungszylinder 10 im linken Teil nur noch schematisch dargestellt. Unterhalb des Kolbens 22 ist der Arbeitsdruckraum 24 erkennbar, in den eine erste Hydraulikleitung A mit einem Leitungszweig A1 10 einmündet. In Figur 1 ist diese Einmündungssteile nur schematisch durch den Pfeil A angedeutet. Im unteren Teil des Arretierungszylinders 10 ist der Entriegelungs-Druckraum 16 dargestellt, in den unterhalb der ersten Dichtung 161 eine Hydraulikleitung X und zwischen der ersten Dichtung 1 61 und der zweiten Dichtung 1 62 eine weitere Hydraulikleitung S einmündet. In Figur 1 sind diese Einmündungssteilen nur schematisch durch die Pfeil X und S angedeutet. In Fig. 5, the locking cylinder 10 is shown only schematically in the left part. Below the piston 22, the working pressure chamber 24 can be seen, in which a first hydraulic line A with a line branch A1 10 opens. In Figure 1, these confluence parts is indicated only schematically by the arrow A. In the lower part of the locking cylinder 10 of the unlocking pressure chamber 16 is shown in the below the first seal 161, a hydraulic line X and between the first seal 1 61 and the second seal 1 62 opens a further hydraulic line S. In Figure 1, these confluence parts are indicated only schematically by the arrow X and S.
Die Hydraulikleitungen A, X und S werden durch einen im rechten Teil der Figur 5 schematisch dargestellten hydraulischen Steuerblock 102 gesteuert, der in Verbindung mit einem Mehrwegeventil 105 und den von diesem gesteuert beauf- schlagten Hydraulikleitungen A und B ein hydraulisches Steuersystem 100 bildet. Der hydraulische Steuerblock 102 ist in Figur 1 an der rechten Seite des Gehäuses 19 angeflanscht. The hydraulic lines A, X and S are controlled by a hydraulic control block 102 shown schematically in the right-hand part of FIG. 5, which forms a hydraulic control system 100 in conjunction with a multi-way valve 105 and the hydraulic lines A and B controlled by it. The hydraulic control block 102 is flanged to the right side of the housing 19 in FIG.
Im hydraulischen Steuerblock 102 sind drei Ventile 1 10,120 und 130 angeordnet. Das erste Ventil 1 10 ist auf der rechten Seite über einen Leitungszweig A1 10 mit der ersten Hydraulikleitung A verbunden. Das erste Ventil 1 10 ist auf der linken Seite über den Leitungszweig A1 12 mit dem Arbeitsdruckraum 24 verbunden. Auf seiner Unterseite ist das erste Ventil 1 10 mit der Hydraulikleitung S verbunden und auf seiner Oberseite ist das erste Ventil 1 10 über eine Steuerleitung 1 18 mit dem zweiten Ventil 120 verbunden, wobei die Steuerleitung 1 18 eine wechselseitig gegenläufige Schaltung der Ventile 1 10 und 120 bewirkt. Das zweite Ventil 120 ist auf seiner linken Seite über einen Leitungszweig B120 mit der zweiten Hydraulikleitung B verbunden. Auf der rechten Seite ist das zweite Ventil 120 über einen Leitungszweig B130 mit dem dritten Ventil 130 verbunden, das in diesem Bereich eingangsseitig ein Wechselventil 134 aufweist, welches eine Strömung zum Leitungszweig B130 hin unterbindet oder freigibt. Der Leitungszweig B120 und der Leitungszweig B130 sind zusätzlich durch eine das zweite Ventil 120 umgehende Bypassleitung 124 miteinander verbunden, in welche ein den Durchfluss zum Leitungszweig B130 hin sperrendes Rückschlagventil 122 eingesetzt ist. In the hydraulic control block 102, three valves 1 10,120 and 130 are arranged. The first valve 1 10 is connected on the right side via a branch line A1 10 with the first hydraulic line A. The first valve 1 10 is connected on the left side via the branch line A1 12 with the working pressure chamber 24. On its underside, the first valve 1 10 is connected to the hydraulic line S and on its upper side, the first valve 1 10 via a control line 1 18 connected to the second valve 120, wherein the control line 1 18 a mutually opposite circuit of the valves 1 10 and 120 causes. The second valve 120 is connected on its left side via a branch line B120 with the second hydraulic line B. On the right-hand side, the second valve 120 is connected via a line branch B130 to the third valve 130, which on the input side has a shuttle valve 134 in this area, which inhibits or releases flow to the line branch B130. The line branch B120 and the line branch B130 are additionally connected to one another by a bypass line 124 which bypasses the second valve 120 and into which a check valve 122 blocking the flow to the line branch B130 is inserted.
Das dritte Ventil 130 steht an seiner Unterseite über ein Rückschlagventil 132 mit der ersten Hydraulikleitung A in Verbindung, wobei das Rückschlagventil 132 nur eine Strömung von der ersten Hydraulikleitung A zum dritten Ventil 130 zulässt. An seiner linken Seite ist das dritte Ventil 130 mit der zum Entriegelungs- Druckraum 1 6 führenden Hydraulikleitung X verbunden. The third valve 130 is connected at its bottom via a check valve 132 with the first hydraulic line A, wherein the check valve 132 allows only a flow from the first hydraulic line A to the third valve 130. On its left side, the third valve 130 is connected to the unlocking pressure chamber 1 6 leading hydraulic line X.
Nachfolgend ist ausgehend von einem Eingriff der Verriegelungsbolzen 18 in die Arretierungsnuten 34 eine Entriegelung und ein anschließendes Anheben des Kolbens 22 beschrieben. Subsequently, starting from an engagement of the locking pin 18 in the locking grooves 34 an unlocking and a subsequent lifting of the piston 22 is described.
Über das Mehrwegeventil 105 wird die erste Hydraulikleitung A mit Druck beaufschlagt. Über den Leitungszweig A130 steuert das dritte Ventil 130 diesen Druck in die Hydraulikleitung X durch, wobei das Rückschlagventil 132 öffnet und das Wechselventil 134 den Weg zur Zweigleitung 132 sperrt. About the multi-way valve 105, the first hydraulic line A is pressurized. Via the line branch A130, the third valve 130 controls this pressure in the hydraulic line X, whereby the check valve 132 opens and the shuttle valve 134 blocks the path to the branch line 132.
Die Hydraulikleitung S ist hierbei noch drucklos, so dass das erste Ventil 1 10 noch die Verbindung vom Leitungszweig A1 10 zum Leitungszweig A1 12 unterbindet. Es wird daher ausgehend von der Hydraulikleitung A zunächst nur ein Entriegelungsdruck im Entriegelungs-Druckraum 1 6 aufgebaut, aber noch kein Druck im Arbeitsdruckraum 24. Die Entriegelung wird somit zeitlich eindeutig vom Arbeitshub abgekoppelt. Der über die Hydraulikleitung X in den Entriegelungs-Druckraum 1 6 eingespeiste Entriegelungsdruck bewirkt das Abheben des Verriegelungsteils 32 von den Verriegelungsbolzen 18. Beim Abheben des Verriegelungsteils 32 wird über die By- passbohrung 35 und deren frei werdende Austrittsöffnung 35S auch die als Steu- erdruckleitung wirksame Hydraulikleitung S mit dem Entriegelungsdruck beaufschlagt. Diese steuert das erste Ventil 1 10 in die Durchgangsposition, in der der Leitungszweig A1 10 mit dem Leitungszweig A1 12 verbunden ist. Hierdurch wird von der ersten Hydraulikleitung A nun auch der erforderliche Arbeitsdruck in den Arbeitsdruckraum 24 eingespeist. Der Kolben 22 wird dabei durch Drehung der Spindel 30 nach oben bewegt. The hydraulic line S is in this case still depressurized, so that the first valve 1 10 nor the connection from the line branch A1 10 to the line branch A1 12 stops. Therefore, starting from the hydraulic line A, initially only one unlocking pressure in the unlocking pressure chamber 16 is built up, but still no pressure in the working pressure chamber 24. The unlocking is thus unequivocally uncoupled from the working stroke. The unlocking pressure fed in via the hydraulic line X into the unlocking pressure chamber 16 causes the locking part 32 to be lifted off the locking bolt 18. When the locking part 32 is lifted off, the bypass bore 35 and its released outlet opening 35S also act as the control pressure line Hydraulic line S is acted upon by the unlocking pressure. This controls the first valve 1 10 in the passage position in which the line branch A1 10 is connected to the line branch A1 12. As a result, the required working pressure is now also fed into the working pressure chamber 24 from the first hydraulic line A. The piston 22 is thereby moved by rotation of the spindle 30 upwards.
Zum Absenken des Kolbens 22 wird durch das Mehrwegeventil 105 die zweite Hydraulikleitung B mit Druck beaufschlagt und die erste Hydraulikleitung A gleichzeitig entlastet. Über den Leitungszweig B120, das zweite Ventil 120 und den Leitungszweig B130 wird der Druck über das dritte Ventil 130 in die Hydraulikleitung X eingespeist. Dadurch wird auch gleichzeitig über den Entriegelungs-Druckraum 16 die Hydraulikleitung S mit Druck beaufschlagt. Dieser Druck bewirkt ein Umsteuern des ersten Ventils 1 10 und gleichzeitig über die Steuerleitung 1 18 auch ein Umsteuern des zweiten Ventils 120. Somit wird immer nur so viel Druck aufgebaut, wie er zum Heben der Last benötigt wird. Beim Absenken der Last wird auch umgekehrt jeweils nur so viel Gegendruck aufgebaut, dass ein langsames Absenken der Last erfolgt. Im Falle eines plötzlichen Hydraulikdruckabfalls sorgt die sofort wirksam werdende mechanische Verriegelung über die mit den Verrie- gelungsbolzen18 in Eingriff geratenden Arretierungsnuten 34 für ein sicheres Abfangen der Last in jeder beliebigen Zwischenposition. To lower the piston 22, the second hydraulic line B is pressurized by the multi-way valve 105 and the first hydraulic line A is simultaneously relieved. Via the line branch B120, the second valve 120 and the line branch B130, the pressure is fed via the third valve 130 into the hydraulic line X. As a result, the hydraulic line S is also subjected to pressure simultaneously via the unlocking pressure chamber 16. This pressure causes a reversal of the first valve 1 10 and at the same time via the control line 1 18 and a reversing of the second valve 120. Thus, only as much pressure is built up, as it is needed to lift the load. When lowering the load, conversely, in each case only so much back pressure is built up that a slow lowering of the load takes place. In the event of a sudden drop in hydraulic pressure, the mechanical lock immediately acting on the lock engaging with the locking pin 18 locking grooves 34 ensures safe interception of the load in any intermediate position.
Die Bypassleitung 122 mit dem sich öffnenden Rückschlagventil 122 sorgt nach Beendigung eines Hub- oder Absenkvorgangs für einen gesteuerten Druckabbau. Der im Entriegelungs-Druckraum 1 6 anstehende Druck wird dabei über die Hyd- raulikleitung X, über das dritte Ventil 130 mit seinem sich jetzt nach oben öffnenden Wechselventil 134 und über die Bypassleitung 122 zur dann drucklosen Hydraulikleitung B120 und B hin abgebaut. Das auch für sich gesehen erfinderische hydraulische Steuersystem 100 sorgt somit in einfacher Weise für eine sehr vorteilhafte, den Verschleiß minimierende Entkopplung des Entriegelungsvorgangs vom Arbeitshub eines hydromechani- schen Arretierungszylinders. The bypass line 122 with the opening check valve 122 provides for a controlled pressure reduction after completion of a lifting or lowering operation. The pressure present in the unlocking pressure chamber 16 is thereby reduced via the hydraulic line X, via the third valve 130 with its now upwardly opening shuttle valve 134 and via the bypass line 122 to the then pressureless hydraulic line B120 and B. The inventive hydraulic control system 100 also provides in a simple manner for a very advantageous, minimizing the wear decoupling of the unlocking process from the working stroke of a hydromechanical locking cylinder.
Bezugszeichenliste LIST OF REFERENCE NUMBERS
10 Arretierungszylinder 10 locking cylinders
1 1 Abschlussteil  1 1 final part
1 1 10 Gewinde 1 1 10 thread
1 120 Dichtung 1 120 gasket
12 Zylinderrohr  12 cylinder tube
13 Sensor (Magnetschalter)  13 sensor (magnetic switch)
14 Boden  14 floor
15 Befestigungs-Auge  15 fixing eye
16 Entriegelungs-Druckraum  16 unlocking pressure chamber
161 erste Dichtung  161 first seal
162 zweite Dichtung  162 second seal
18 Verriegelungsbolzen  18 locking bolts
19 Gehäuse  19 housing
20 Kolbenstange (Kolbenrohr) 20 piston rod (piston tube)
21 Befestigungs-Auge  21 fixing eye
22 Kolben  22 pistons
23 Innengewinde  23 internal thread
24 Arbeitsdruckraum  24 working pressure room
30 Spindel 30 spindle
31 Außengewinde  31 external thread
32 Verriegelungsteil (Arretierungsnabe) 32 locking part (locking hub)
33 Nadellager 33 needle roller bearings
332 Stützscheibe 332 support disk
34 Arretierungsnut  34 locking groove
35 Bypassbohrung (in 32)  35 Bypass hole (in 32)
35X Eintrittsöffnung (von 35, verbunden mit X) 35X inlet (from 35, connected to X)
35S Austrittsöffnung (von 35, verbunden mit S)35S outlet (from 35, connected to S)
36 Anfasung 36 chamfering
38 Aussparung 100 hydraulisches Steuersystem 38 recess 100 hydraulic control system
102 hydraulischer Steuerblock  102 hydraulic control block
105 Mehrwegeventil  105 multiway valve
1 10 erstes Ventil  1 10 first valve
1 1 6 Feder  1 1 6 spring
1 18 Steuerleitung  1 18 control line
120 zweites Ventil  120 second valve
122 Rückschlagventil  122 check valve
124 Bypassleitung  124 bypass line
130 drittes Ventil  130 third valve
132 Rückschlagventil  132 check valve
134 Wechselventil  134 shuttle valve
A erste Hydraulikleitung A first hydraulic line
A1 10 Leitungszweig (von A zum ersten Ventil 1 10)  A1 10 line branch (from A to the first valve 1 10)
A1 12 Leitungszweig (vom ersten Ventil 1 10 zum Arbeitsdruckraum) A1 12 Line branch (from the first valve 1 10 to the working pressure chamber)
A130 Leitungszweig (vom Mehrwegeventil 105 zum ersten Ventil 1 10) A130 line branch (from multiway valve 105 to first valve 1 10)
B zweite Hydraulikleitung B second hydraulic line
B120 Leitungszweig (von B zum zweiten Ventil 120)  B120 line branch (from B to the second valve 120)
B130 Leitungszweig (vom zweiten Ventil 120 zum dritten Ventil 130)  B130 line branch (from the second valve 120 to the third valve 130)
X Hydraulikleitung (zum Entriegelungs-Druckraum) X hydraulic line (for unlocking pressure chamber)
S Hydraulikleitung (Steuerleitung vom Entriegelungs- Druckraum zu den Ventilen 1 10 und 120)  S hydraulic line (control line from unlocking pressure chamber to valves 1 10 and 120)

Claims

Patentansprüche claims
1 . Hydromechanischer Arretierungszylinder (10) mit einem in einem Zylinderrohr (12) hydraulisch betätigbaren Kolben (22), der mittels eines Gewindes (23) mit einem an einer Spindel (30) angeordneten Gewinde (31 ) im Eingriff steht, wobei die Spindel (30) für eine Unterbrechung einer Bewegung des Kolbens (22) mittels eines Verriegelungsteils (32) arretierbar ist, dadurch gekennzeichnet, dass die Spindel (30) und das Verriegelungsteil (32) einstückig ausgebildet oder fest miteinander verbunden sind und das Verriegelungsteil (32) mittels wenigstens einer stirnseitig angeordneten, radial und axial offenen Arretierungsnut (34) mit wenigstens einem feststehenden Verriegelungsbolzen (18) in Eingriff bringbar ist. 1 . Hydromechanical locking cylinder (10) having a piston (22) hydraulically actuated in a cylinder tube (12) which is engaged by means of a thread (23) with a thread (31) arranged on a spindle (30), the spindle (30) for interrupting a movement of the piston (22) by means of a locking part (32) can be locked, characterized in that the spindle (30) and the locking part (32) are integrally formed or firmly connected to each other and the locking part (32) by means of at least one arranged frontally, radially and axially open Arretierungsnut (34) with at least one fixed locking bolt (18) is engageable.
2. Arretierungszylinder nach Anspruch 1 , dadurch gekennzeichnet, dass am Umfang der Stirnseite des Verriegelungsteils (32) gleichmäßig voneinander beabstandet mehrere Arretierungsnuten (34) angeordnet sind. 2. locking cylinder according to claim 1, characterized in that at the periphery of the end face of the locking part (32) evenly spaced from each other a plurality of locking grooves (34) are arranged.
3. Arretierungszylinder nach einem der vorhergehenden Ansprüche dadurch gekennzeichnet, dass das gleichmäßig voneinander beabstandet mehrere Verriegelungsbolzen (18) vorgesehen sind. 3. locking cylinder according to one of the preceding claims, characterized in that the equally spaced from each other a plurality of locking bolts (18) are provided.
4. Arretierungszylinder nach Anspruch 3, dadurch gekennzeichnet, dass die Anzahl der Arretierungsnuten (34) einem ganzzahligen Vielfachen der Anzahl der Verriegelungsbolzen (18) entspricht. 4. locking cylinder according to claim 3, characterized in that the number of Arretierungsnuten (34) corresponds to an integer multiple of the number of locking bolts (18).
5. Arretierungszylinder nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Arretierungsnuten (34) in Umfangsrichtung an wenigstens einer Seite mit einer Anfasung (36) versehen sind. 5. locking cylinder according to one of the preceding claims, characterized in that the locking grooves (34) are provided in the circumferential direction on at least one side with a chamfer (36).
6. Arretierungszylinder nach Anspruch 5, dadurch gekennzeichnet, dass die Arretierungsnuten (34) in Umfangsrichtung zu beiden Seiten mit jeweils einer Anfasung (36) versehen sind. 6. locking cylinder according to claim 5, characterized in that the locking grooves (34) are provided in the circumferential direction on both sides, each with a chamfer (36).
7. Arretierungszylinder nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass an der Innenwand des Zylinderrohres (12) im Be- reich des Verriegelungsteils (32) wenigstens eine Dichtung (1 61 , 1 62) angeordnet ist, die einen die Bewegung des Kolbens (22) begrenzenden Arbeitsdruckraum (24) von einem die Bewegung des Verriegelungsteils (32) begrenzenden Entriegelungs-Druckraum (1 6) trennt. 7. Locking cylinder according to one of the preceding claims, characterized in that on the inner wall of the cylinder tube (12) in the loading at least one seal (1 61, 1 62) is arranged rich of the locking part (32), the (24) limiting the movement of the piston (22) working pressure space (24) of a movement of the locking part (32) delimiting unlocking pressure chamber (1 6) separates.
8. Arretierungszylinder nach Anspruch 7, dadurch gekennzeichnet, dass der Entriegelungs-Druckraum (18) mit zwei Hydraulikleitungen (S, X) verbunden ist. 8. locking cylinder according to claim 7, characterized in that the unlocking pressure chamber (18) with two hydraulic lines (S, X) is connected.
9. Arretierungszylinder nach Anspruch 8, dadurch gekennzeichnet, dass wenigstens eine der mit dem Entriegelungs-Druckraum (18) verbundenen Hydraulikleitungen (S, X) mit wenigstens einem Ventil (1 10; 120; 130) in Verbindung steht, das die Druckbeaufschlagung des Arbeitsdruckraums (24) steuert. 9. locking cylinder according to claim 8, characterized in that at least one of the unlocking pressure chamber (18) connected hydraulic lines (S, X) with at least one valve (1 10; 120; 130) is in communication, the pressurization of the working pressure space (24) controls.
10. Arretierungszylinder nach Anspruch 9, dadurch gekennzeichnet, dass die zwei Hydraulikleitungen (S, X) mittels wenigstens einer im Verriegelungsteil (32) angeordneter Bypassbohrung (35) in der Entriegelungsposition verbindbar sind. 10. locking cylinder according to claim 9, characterized in that the two hydraulic lines (S, X) by means of at least one in the locking part (32) arranged bypass bore (35) are connectable in the unlocking position.
1 1 . Arretierungszylinder nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass am Zylinderrohr (12) ein Nadellager (33) angeordnet ist, das einen Anschlag für das Verriegelungsteil (32) in der Entriegelungsposition bildet. 1 1. Locking cylinder according to one of the preceding claims, characterized in that on the cylinder tube (12) a needle bearing (33) is arranged, which forms a stop for the locking part (32) in the unlocked position.
12. Hydraulisches Steuersystem (100), insbesondere zur Betätigung eines Arretierungszylinders (10) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Steuersystem (100) wenigstens ein Ventil (1 10) zur Beaufschlagung eines zur Betätigung eines Kolbens (22) dienenden Arbeitsdruckraums (24) umfasst, das gegenläufig bewegungsgekoppelt mit einem Ventil (120) zur Beaufschlagung oder Entlastung eines Entriegelungs-Druckraumes (1 6) ist, der zur Betätigung eines die Hubbewegung des Kolbens (22) hemmenden oder freigebenden Verriegelungsteils (32) dient. 12. A hydraulic control system (100), in particular for actuating a locking cylinder (10) according to one of the preceding claims, characterized in that the control system (100) at least one valve (1 10) for acting on a piston (22) serving for working pressure space (24), which is in opposite movement coupled with a valve (120) for acting on or relieving an unlocking pressure chamber (1 6), which serves for actuating a lifting movement of the piston (22) inhibiting or releasing locking part (32).
13. Hydraulisches Steuersystem (100) nach Anspruch 12, dadurch gekennzeichnet, dass alle zur Betätigung des Kolbens (22) und des Verriegelungsteils (32) dienenden Ventile (1 10; 120; 130) in einen hydraulischen Steuerblock (1 12) integriert sind. 13. A hydraulic control system (100) according to claim 12, characterized in that all the actuation of the piston (22) and the locking part (32) serving valves (1 10; 120; 130) are integrated in a hydraulic control block (1 12).
EP17791292.0A 2016-10-10 2017-10-05 Hydromechanical blocking cylinder and hydraulic control system for actuating same Active EP3344881B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016119251.1A DE102016119251A1 (en) 2016-10-10 2016-10-10 Hydromechanical locking cylinder and hydraulic control system for its operation
PCT/EP2017/075297 WO2018069128A1 (en) 2016-10-10 2017-10-05 Hydromechanical blocking cylinder and hydraulic control system for actuating same

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EP3344881A1 true EP3344881A1 (en) 2018-07-11
EP3344881B1 EP3344881B1 (en) 2019-05-22

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DE (1) DE102016119251A1 (en)
WO (1) WO2018069128A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BR102020000380A2 (en) 2019-01-09 2020-09-24 Cnh Industrial America Llc CYLINDER LOCKING SYSTEM
CN114508521A (en) * 2022-03-04 2022-05-17 烟台星辉航空液压有限公司 Locking device for holding shafts tightly at any position

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7004075A (en) * 1970-03-20 1971-09-22
DE20216197U1 (en) * 2002-10-22 2004-03-04 Bümach Engineering International B.V. Hydraulic working cylinder
DE10356597B3 (en) * 2003-12-04 2005-06-02 Neumeister Hydraulik Gmbh Locking cylinder unit for hydraulically actuated component has several locking bodies in form of separately movable locking bolts
DE10356596B3 (en) * 2003-12-04 2005-06-02 Neumeister Hydraulik Gmbh Locking cylinder for hydraulic system has load-holding descent brake devices connected to two working chambers
DE10356598B3 (en) * 2003-12-04 2005-06-02 Neumeister Hydraulik Gmbh Locking cylinder for hydraulically actuated component has spindle axially movable relative to cylinder and fixed to support body
DE102004022203B3 (en) * 2004-05-05 2005-08-11 Neumeister Hydraulik Gmbh Locking cylinder for ramps for low bed trucks has units for disengaging a plunger thread and a spindle thread so that axial movement of the plunger about the rotary axis is possible relative to the cylinder without rotating the spindle
DE102005015059A1 (en) * 2005-03-31 2006-10-05 Aros Hydraulik Gmbh Lockable working cylinder
DE102007024736B3 (en) * 2007-05-25 2008-06-12 Neumeister Hydraulik Gmbh Locking cylinder with fluidic slide bearing has supporting body as supporting and bearing body with supporting and bearing surface and counter supporting and bearing surface of second axial bearing in form of fluidic slide bearing
AT505793B1 (en) * 2007-09-21 2010-03-15 Weber Hydraulik Gmbh CYLINDER PISTON UNIT WITH LOCKING ARRANGEMENT

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EP3344881B1 (en) 2019-05-22
WO2018069128A1 (en) 2018-04-19

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