EP3731997B1 - Hydraulic tool for a pulling and/or pressing device - Google Patents

Hydraulic tool for a pulling and/or pressing device Download PDF

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Publication number
EP3731997B1
EP3731997B1 EP18830478.6A EP18830478A EP3731997B1 EP 3731997 B1 EP3731997 B1 EP 3731997B1 EP 18830478 A EP18830478 A EP 18830478A EP 3731997 B1 EP3731997 B1 EP 3731997B1
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EP
European Patent Office
Prior art keywords
hydraulic
tool
hydraulic tool
screwdriver
power piston
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP18830478.6A
Other languages
German (de)
French (fr)
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EP3731997A1 (en
Inventor
Klaus Reitzig
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.)
Ws Wielander and Schill Engineering & Co KG GmbH
Original Assignee
Ws Wielander and Schill Engineering & Co KG 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
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Publication of EP3731997A1 publication Critical patent/EP3731997A1/en
Application granted granted Critical
Publication of EP3731997B1 publication Critical patent/EP3731997B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J15/00—Riveting
    • B21J15/10—Riveting machines
    • B21J15/16—Drives for riveting machines; Transmission means therefor
    • B21J15/20—Drives for riveting machines; Transmission means therefor operated by hydraulic or liquid pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
    • B25B27/02—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for connecting objects by press fit or detaching same
    • B25B27/026—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for connecting objects by press fit or detaching same fluid driven
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F3/00—Associations of tools for different working operations with one portable power-drive means; Adapters therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/005—Hydraulic driving means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D28/00—Shaping by press-cutting; Perforating
    • B21D28/002—Drive of the tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D28/00—Shaping by press-cutting; Perforating
    • B21D28/24—Perforating, i.e. punching holes
    • B21D28/34—Perforating tools; Die holders
    • B21D28/343—Draw punches
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
    • B25B27/0007—Tools for fixing internally screw-threaded tubular fasteners
    • B25B27/0014—Tools for fixing internally screw-threaded tubular fasteners motor-driven
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
    • B25B27/02—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for connecting objects by press fit or detaching same
    • B25B27/06—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for connecting objects by press fit or detaching same inserting or withdrawing sleeves or bearing races
    • B25B27/064—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for connecting objects by press fit or detaching same inserting or withdrawing sleeves or bearing races fluid driven
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
    • B25B27/02—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for connecting objects by press fit or detaching same
    • B25B27/10—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for connecting objects by press fit or detaching same inserting fittings into hoses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/02—Construction of casings, bodies or handles
    • B25F5/025—Construction of casings, bodies or handles with torque reaction bars for rotary tools
    • B25F5/026—Construction of casings, bodies or handles with torque reaction bars for rotary tools in the form of an auxiliary handle
    • 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
    • F15B15/18—Combined units comprising both motor and pump

Definitions

  • the invention relates to a hydraulic tool for driving a pulling and/or pressing device.
  • the invention particularly relates to a hydraulic tool which is designed as an attachment for a screwdriver, in particular a cordless screwdriver, and with which hydraulic tools for setting rivets, in particular blind rivets, as well as tools for punching or pressing in and out of workpieces can be operated.
  • the disclosure document DE 10 2011 111 533 A1 shows a pneumatic/hydraulic pressure generator, which is designed as a hand-held device and with which riveting tools in particular can be operated.
  • the document DE 200 17 118 U1 shows a tool that can be coupled to a screwdriver, as contained in the preamble of claim 1.
  • the invention is based on the object of providing a hydraulic tool for driving a pulling and/or pressing device, which is powerful and compact, but at the same time can be manufactured particularly easily.
  • the object of the invention is already achieved by a hydraulic tool for driving a pulling and/or pressing device according to claim 1.
  • the invention relates to a hydraulic tool for driving a pulling and/or pressing device.
  • the invention relates to a hydraulic tool by means of which rivets, in particular blind rivets, punch rivets and two-part rivets, are set.
  • the hydraulic tool can also be used to drive a pressing device, for example for punching or pressing in or out components.
  • the hydraulic tool comprises a drive shaft that can be attached to a screwdriver.
  • the hydraulic tool can be attached to an electric screwdriver, in particular a cordless screwdriver.
  • the hydraulic tool comprises a hydraulic pump which is driven by the drive shaft and which pumps hydraulic fluid into the working chamber of a working piston.
  • One aspect of the invention relates to the fact that the hydraulic tool can be attached to a commercially available screwdriver, in particular a cordless screwdriver.
  • a commercially available screwdriver in particular a cordless screwdriver.
  • Such devices which include an electric motor, for example, are available in almost every workshop and are also quite inexpensive.
  • a pump piston is moved in an oscillating manner via the drive shaft that can be connected to the screwdriver, which pumps hydraulic fluid into the working space of a hydraulic working piston.
  • the tool therefore comprises a hydraulic pump piston, also called a plunger, which is part of the hydraulic pump that pumps hydraulic fluid into the working chamber of the working piston through an oscillating movement of the pump piston.
  • a hydraulic pump piston also called a plunger
  • the working piston has a larger surface area subject to pressure than the pump piston.
  • the working piston is at least twenty, preferably fifty, preferably up to 100 times as large as the pump piston in terms of an area subject to hydraulic fluid (relative to the piston area of at least one side of the working piston).
  • a pressure of over 500 bar can be achieved in the working chamber of the working piston.
  • the working cylinder can preferably generate compressive and/or tensile forces of over 10,000 N, particularly preferably over 50,000 N.
  • the hydraulic tool according to the invention can also be constructed from relatively few components, which allows a compact design as a hand-held device to be achieved.
  • the working piston is connected to a coupling for a setting or pressing tool attachment.
  • the hydraulic tool according to the invention is thus constructed in such a modular manner that a tool for different tasks can be designed using different attachments which are coupled to the working piston, for example a blind riveting tool, a tool for setting two-part rivets, and a punching tool.
  • the pump piston can be moved in an oscillating manner by means of an eccentric.
  • an eccentric shaft rotates in two ball or needle bearings.
  • the pump piston pumps the hydraulic fluid into the working chamber of the working piston via a suction and pressure valve.
  • the pump piston preferably has a stroke of more than 1 mm and less than 10 mm, preferably from 2 to 7 mm.
  • the hydraulic tool comprises a reservoir for hydraulic fluid, which serves as a buffer volume when the working piston is moved. This makes it possible to provide a self-contained system in which the hydraulic fluid flowing in or out when the working piston is moved flows into or out of the buffer volume.
  • the working piston of the hydraulic tool is preferably designed as a differential piston.
  • a front piston surface has a smaller surface area exposed to hydraulic fluid than the rear piston surface, particularly due to a tool holder.
  • the hydraulic tool can be set to the forward or backward position of the working piston via a control element.
  • the working piston In the forward position of the working piston, it preferably moves forwards due to the pressure in the hydraulic fluid reservoir, whereas the working piston remains in its position in the backward position when the cordless screwdriver is not operated. This means that the workpiece can be approached slowly when riveting or punching.
  • the hydraulic tool is preferably purely mechanically connected to the setting or
  • the reservoir for hydraulic fluid is arranged behind the working piston and laterally offset from the drive shaft.
  • the reservoir for hydraulic fluid is designed such that it is arranged above the housing of the screwdriver when connected to a screwdriver. This allows a compact design to be provided.
  • the housing of the hydraulic tool is divided into three main sections.
  • a first section of the housing comprises the working space with the working piston and is preferably arranged in front of the drive shaft ("in front of”, “behind”, “above” and “below” in the sense of the invention is understood to mean the position in the installed state from the perspective of a cordless screwdriver standing on its base).
  • the coupled tool attachment is preferably arranged axially to the drive shaft of the screwdriver so that the ergonomic shape of the screwdriver and its operating device can continue to be used if necessary.
  • a second housing section with the reservoir for hydraulic fluid extends laterally offset to the Drive shaft and is therefore arranged next to or above the housing of the screwdriver when connected.
  • a middle housing section in which at least the pump piston, which is part of the hydraulic pump, is arranged.
  • the pump piston is preferably arranged transversely, in particular vertically, to the drive shaft and/or the working piston.
  • the eccentric can thus be connected in line with the drive shaft and drive the pump piston. This also makes it easier to provide a tool with a compact design.
  • the hydraulic tool comprises a control element, depending on the actuation of which hydraulic fluid is conveyed into a working chamber of the working piston either in front of or behind the working piston.
  • the control element is designed in such a way that the hydraulic tool can be put into two operating states, namely either for pressing or for pulling.
  • the hydraulic pump pumps hydraulic fluid into the working chamber behind the working piston, whereas for pulling, the fluid is pumped into the working chamber in front of the working piston.
  • control element is preferably coupled to a hydraulic control valve.
  • this is a spring-return 5/2-way valve, in particular with regard to the functionality of the automatic movement to a predetermined end position.
  • control element is designed such that the working piston must be permanently actuated in order to advance it.
  • the hydraulic tool is designed in such a way that in the basic position of the control element, the working piston is subjected to pressure from the piston rod side, so that the working piston is retracted.
  • the drive shaft of the screwdriver drives the hydraulic pump and the working piston is retracted with such high force that a forming process, for example the setting of a blind rivet, can be carried out.
  • the user In order to advance the working piston via the hydraulic pump, for example for punching or processing two-part rivets, the user must permanently operate the actuating element.
  • the control valve can, as provided in one embodiment of the invention, comprise a rod running transversely, in particular perpendicularly, to the working piston, via which channels running along the rod are opened and closed.
  • the control valve can in particular be switched via a tappet actuation.
  • the reservoir for hydraulic fluid is preferably installed upstream of the hydraulic pump.
  • the accumulator preferably buffers a quantity of hydraulic fluid that is at least as large as, but preferably at least twice the displacement volume of the working cylinder.
  • the accumulator for hydraulic fluid can comprise a piston preloaded by a spring.
  • This piston permanently exerts pressure on the hydraulic fluid in the accumulator.
  • a gas pressure accumulator is conceivable, in which a membrane or a piston is preloaded by gas pressure.
  • the pressure in the accumulator for hydraulic fluid is preferably 5 to 30, particularly preferably 8 to 15 bar.
  • control valve which is designed as a 5/2-way valve, is operated without activating the screwdriver, the working piston moves to the front end position solely due to this pressure.
  • the working piston is designed as a differential piston.
  • the working piston always moves forward without activating the screwdriver, so that when setting a rivet, for example, the setting punch can be moved slowly and without energy expenditure towards the workpiece.
  • the hydraulic tool comprises a pressure control valve, which is preferably designed as a full-stroke safety valve and which preferably offers the possibility of presetting the maximum working pressure or the maximum pressing force.
  • the valve opens when a preset maximum pressure is reached and prevents the preset operating pressure and thus the permissible pressing or pulling force from being exceeded.
  • the overflowing hydraulic fluid flows back into the hydraulic accumulator.
  • the hydraulic tool according to the invention benefits from the fact that cordless screwdrivers usually have an adjustable
  • torque limitation This can be used advantageously to limit the force exerted by the working piston.
  • the pressure control valve ensures that only a specified maximum pressure is reached in the hydraulic area and that, as a result, the maximum torque available on the drive shaft is also limited.
  • the hydraulic tool comprises a torque support which is designed such that it is supported on the housing of the screwdriver.
  • the torque support is arranged on the storage housing for hydraulic fluid.
  • the drive shaft only needs to be clamped into the chuck of the screwdriver.
  • the torque arm supports the hydraulic tool on at least one side, preferably on both sides of the housing. It is therefore not necessary to couple the housing of the hydraulic tool to the housing of the screwdriver using further assembly steps, such as screwing it.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Hand Tools For Fitting Together And Separating, Or Other Hand Tools (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)

Description

Gebiet der ErfindungField of the invention

Die Erfindung betrifft ein Hydraulikwerkzeug zum Antrieb einer Zug- und/oder Pressvorrichtung. Die Erfindung betrifft insbesondere ein Hydraulikwerkzeug, welches als Aufsatz für einen Schrauber, insbesondere Akku-Schrauber, ausgebildet ist und mit welchem sich Hydraulikwerkzeuge vom Setzen von Nieten, insbesondere von Blindnieten, sowie Werkzeuge zum Stanzen oder Aus- und Einpressen von Werksstücken betreiben lassen.The invention relates to a hydraulic tool for driving a pulling and/or pressing device. The invention particularly relates to a hydraulic tool which is designed as an attachment for a screwdriver, in particular a cordless screwdriver, and with which hydraulic tools for setting rivets, in particular blind rivets, as well as tools for punching or pressing in and out of workpieces can be operated.

Hintergrund der ErfindungBackground of the invention

Die Offenlegungsschrift DE 10 2011 111 533 A1 (Erfinder Klaus Reitzig) zeigt einen pneumatisch/hydraulischen Druckerzeuger, welcher als Handgerät ausgebildet ist und mit welchem sich insbesondere Nietwerkzeuge betreiben lassen.The disclosure document DE 10 2011 111 533 A1 (inventor Klaus Reitzig) shows a pneumatic/hydraulic pressure generator, which is designed as a hand-held device and with which riveting tools in particular can be operated.

Diese können über eine Schnellkupplung mit einem selbstschließenden Hydraulikventil angekoppelt werden.These can be connected via a quick coupling with a self-closing hydraulic valve.

Da der in diesem Dokument beschriebene Druckerzeuger nach dem Prinzip der pneumatisch/hydraulischen Pumpe arbeitet, lassen sich bei kleinem Bauraum hohe Drücke erzeugen. Es konnte so ein sehr leistungsfähiges Handgerät bereitgestellt werden.Since the pressure generator described in this document works according to the principle of a pneumatic/hydraulic pump, high pressures can be generated in a small installation space. This made it possible to provide a very powerful handheld device.

Nachteilig an diesem bekannten Druckerzeuger bzw. einem diesen Druckerzeuger umfassenden Nietgerät ist, dass das Werkzeug recht aufwendig aufgebaut ist und daher entsprechend kostspielig herzustellen ist.The disadvantage of this known pressure generator or a riveting device comprising this pressure generator is that the The tool is quite complex in construction and is therefore expensive to produce.

Weiter ist zum Betrieb des Werkzeugs ein Druckluftanschluss erforderlich,Furthermore, a compressed air connection is required to operate the tool,

Das Dokument DE 200 17 118 U1 zeigt ein mit einem Schrauber koppelbares Werkzeug, wie es im Oberbegriff von Anspruch 1 enthalten ist.The document DE 200 17 118 U1 shows a tool that can be coupled to a screwdriver, as contained in the preamble of claim 1.

Aufgabe der ErfindungObject of the invention

Der Erfindung liegt demgegenüber die Aufgabe zugrunde, ein Hydraulikwerkzeug zum Antrieb einer Zug- und/oder Pressvorrichtung bereitzustellen, welches leistungsfähig und kompakt ausgebildet ist, gleichzeitig aber besonders einfach hergestellt werden kann.In contrast, the invention is based on the object of providing a hydraulic tool for driving a pulling and/or pressing device, which is powerful and compact, but at the same time can be manufactured particularly easily.

Zusammenfassung der ErfindungSummary of the invention

Die Aufgabe der Erfindung wird bereits durch ein Hydraulikwerkzeug zum Antrieb einer Zug- und/oder Pressvorrichtung nach Anspruch 1 gelöst.The object of the invention is already achieved by a hydraulic tool for driving a pulling and/or pressing device according to claim 1.

Bevorzugte Ausführungsformen und Weiterbildungen der Erfindung sind dem Gegenstand der abhängigen Ansprüche, der Beschreibung sowie den Zeichnungen zu entnehmen.Preferred embodiments and further developments of the invention can be taken from the subject matter of the dependent claims, the description and the drawings.

Die Erfindung betrifft ein Hydraulikwerkzeug zum Antrieb einer Zug- und/oder Pressvorrichtung.The invention relates to a hydraulic tool for driving a pulling and/or pressing device.

Insbesondere betrifft die Erfindung ein Hydraulikwerkzeug, mittels dessen Niete, insbesondere Blindniete, Stanzniete sowie zweiteilige Niete, gesetzt werden. Weiter kann das Hydraulikwerkzeug auch zum Antrieb einer Pressvorrichtung, beispielsweise zum Stanzen oder Aus- bzw. Einpressen von Bauteilen, verwendet werden.In particular, the invention relates to a hydraulic tool by means of which rivets, in particular blind rivets, punch rivets and two-part rivets, are set. Furthermore, the hydraulic tool can also be used to drive a pressing device, for example for punching or pressing in or out components.

Das Hydraulikwerkzeug umfasst eine an einem Schrauber anbringbare Antriebswelle. Insbesondere ist das Hydraulikwerkzeug an einem Elektroschrauber, insbesondere einem Akku-Schrauber, anbringbar.The hydraulic tool comprises a drive shaft that can be attached to a screwdriver. In particular, the hydraulic tool can be attached to an electric screwdriver, in particular a cordless screwdriver.

Gemäß der Erfindung umfasst das Hydraulikwerkzeug eine hydraulische Pumpe, welche von der Antriebwelle angetrieben wird und welche Hydraulikfluid in den Arbeitsraum eines Arbeitskolbens pumpt.According to the invention, the hydraulic tool comprises a hydraulic pump which is driven by the drive shaft and which pumps hydraulic fluid into the working chamber of a working piston.

Ein Aspekt der Erfindung bezieht sich also darauf, dass das Hydraulikwerkzeug an einem handelsüblichen Schrauber, insbesondere einem Akku-Schrauber, angebracht werden kann. Derartige Geräte, die z.B. einen Elektromotor umfassen, sind nahezu in jeder Werkstatt verfügbar und zudem noch recht preiswert.One aspect of the invention relates to the fact that the hydraulic tool can be attached to a commercially available screwdriver, in particular a cordless screwdriver. Such devices, which include an electric motor, for example, are available in almost every workshop and are also quite inexpensive.

Über die mit dem Schrauber verbindbare Antriebswelle wird gemäß einer bevorzugten Ausführungsform der Erfindung ein Pumpkolben oszillierend bewegt, welcher Hydraulikfluid in den Arbeitsraum eines hydraulischen Arbeitskolbens pumpt.According to a preferred embodiment of the invention, a pump piston is moved in an oscillating manner via the drive shaft that can be connected to the screwdriver, which pumps hydraulic fluid into the working space of a hydraulic working piston.

Das Werkzeug umfasst also einen hydraulischen Pumpkolben, auch Plunger genannt, welcher Teil der hydraulischen Pumpe ist, die durch eine oszillierende Bewegung des Pumpkolbens Hydraulikfluid in den Arbeitsraum des Arbeitskolbens pumpt.The tool therefore comprises a hydraulic pump piston, also called a plunger, which is part of the hydraulic pump that pumps hydraulic fluid into the working chamber of the working piston through an oscillating movement of the pump piston.

Der Arbeitskolben hat eine größere, von Druck beaufschlagte Fläche als der Pumpkolben. Insbesondere ist der Arbeitskolben von einer mit Hydraulikfluid beaufschlagbaren Fläche (bezogen auf die Kolbenfläche zumindest einer Seite des Arbeitskolbens) her mindestens zwanzig, vorzugsweise fünfzig, vorzugsweise bis zu 100 Mal, so groß wie der Pumpkolben.The working piston has a larger surface area subject to pressure than the pump piston. In particular, the working piston is at least twenty, preferably fifty, preferably up to 100 times as large as the pump piston in terms of an area subject to hydraulic fluid (relative to the piston area of at least one side of the working piston).

So lassen sich auf einfache Weise auch mit einem vergleichsweise kleinen Elektrowerkzeug, durch ein entsprechend hohes hydraulisches Übersetzungsverhältnis, hohe Drücke im Arbeitsraum des Arbeitskolbens und damit entsprechend hohe Zug- bzw. Druckkräfte erzeugen.In this way, even with a comparatively small power tool, high pressures in the working chamber of the working piston and thus correspondingly high tensile or compressive forces can be generated in a simple manner by means of a correspondingly high hydraulic transmission ratio.

Beispielsweise lässt sich mit einem Drehmoment von 16 Nm des Schraubers ein Druck im Arbeitsraum des Arbeitskolbens von über 500 bar erzielen. Mit dem Arbeitszylinder lassen sich vorzugsweise Druck- und/oder Zugkräfte von über 10000 N, besonders bevorzugt von über 50000 N erzeugen.For example, with a torque of 16 Nm from the screwdriver, a pressure of over 500 bar can be achieved in the working chamber of the working piston. The working cylinder can preferably generate compressive and/or tensile forces of over 10,000 N, particularly preferably over 50,000 N.

Das erfindungsgemäße Hydraulikwerkzeug kann zudem aus verhältnismäßig wenigen Bauteilen aufgebaut werden, wodurch sich eine kompakte Ausgestaltung als Handgerät erzielen lässt.The hydraulic tool according to the invention can also be constructed from relatively few components, which allows a compact design as a hand-held device to be achieved.

Bei einer bevorzugten Ausführungsform der Erfindung ist der Arbeitskolben mit einer Kupplung für einen Setz- oder Presswerkzeugaufsatz verbunden.In a preferred embodiment of the invention, the working piston is connected to a coupling for a setting or pressing tool attachment.

Das erfindungsgemäße Hydraulikwerkzeug ist also derart modular aufgebaut, dass über verschiedene Aufsätze, welche mit dem Arbeitskolben gekoppelt werden, ein Werkzeug für unterschiedliche Aufgaben ausgebildet sein kann, beispielsweise ein Blindnietwerkzeug, ein Werkzeug zum Setzen von zweiteiligen Nieten, sowie ein Stanzwerkzeug.The hydraulic tool according to the invention is thus constructed in such a modular manner that a tool for different tasks can be designed using different attachments which are coupled to the working piston, for example a blind riveting tool, a tool for setting two-part rivets, and a punching tool.

Bei einer bevorzugten Ausführungsform der Erfindung ist der Pumpkolben mittels eines Exzenters oszillierend bewegbar. Es ist insbesondere vorgesehen, dass eine Exzenterwelle in zwei Kugel- oder Nadellagern rotiert.In a preferred embodiment of the invention, the pump piston can be moved in an oscillating manner by means of an eccentric. In particular, it is provided that an eccentric shaft rotates in two ball or needle bearings.

Zwei weitere Kugel- oder ein Nadellager sind auf dem Exzenter montiert, welches mit dem Pumpkolben formschlüssig verbunden ist. So lässt sich auf engem Bauraum ein oszillierender Antrieb für den Pumpkolben bereitstellen, welcher einfach aufgebaut ist und eine lange Lebensdauer hat.Two additional ball bearings or a needle bearing are mounted on the eccentric, which is positively connected to the pump piston. This makes it possible to provide an oscillating drive for the pump piston in a small installation space, which is simple in design and has a long service life.

Es versteht sich, dass, um eine hydraulische Pumpe auszubilden, der Pumpkolben über ein Saug- und Druckventil das Hydraulikfluid in den Arbeitsraum des Arbeitskolbens pumpt.It is understood that in order to form a hydraulic pump, the pump piston pumps the hydraulic fluid into the working chamber of the working piston via a suction and pressure valve.

Der Pumpkolben hat vorzugsweise einen Hub von über 1 mm und von unter 10 mm, bevorzugt von 2 bis 7 mm.The pump piston preferably has a stroke of more than 1 mm and less than 10 mm, preferably from 2 to 7 mm.

Bei einer Weiterbildung der Erfindung umfasst das Hydraulikwerkzeug einen Speicher für Hydraulikfluid, welcher als Puffervolumen beim Bewegen des Arbeitskolbens dient. So lässt sich ein in sich geschlossenes System bereitstellen, bei welchem das beim Verschieben des Arbeitskolbens ein- oder ausströmende Hydraulikfluid in bzw. aus dem Puffervolumen fließt.In a further development of the invention, the hydraulic tool comprises a reservoir for hydraulic fluid, which serves as a buffer volume when the working piston is moved. This makes it possible to provide a self-contained system in which the hydraulic fluid flowing in or out when the working piston is moved flows into or out of the buffer volume.

Der Arbeitskolben des Hydraulikwerkzeugs ist vorzugsweise als Differenzialkolben ausgebildet. So hat eine vordere Kolbenfläche, insbesondere aufgrund einer Werkzeugaufnahme, eine kleinere von Hydraulikfluid beaufschlagte Fläche als die hintere Kolbenfläche. Infolgedessen wird beim Zurücksetzen des Arbeitskolbens hinter dem Arbeitskolben mehr Hydraulikfluid verdrängt als zum Zurücksetzen vor dem Arbeitskolben hineinfließt. Dies kann durch den Speicher ausgeglichen werden.The working piston of the hydraulic tool is preferably designed as a differential piston. A front piston surface has a smaller surface area exposed to hydraulic fluid than the rear piston surface, particularly due to a tool holder. As a result, when the working piston is reset, more hydraulic fluid is displaced behind the working piston than flows in in front of the working piston when reset. This can be compensated for by the accumulator.

Vorzugsweise ist das Hydraulikwerkzeug über ein Steuerorgan in die Stellungen Vor- oder Zurückfahren des Arbeitskolbens setzbar. In der Stellung zum Vorfahren des Arbeitskolbens fährt dieser vorzugsweise bereits aufgrund des Drucks im Speicher für Hydraulikfluid nach vorne, wohingegen der Arbeitskolben in der Stellung zum Zurückfahren bei nicht betätigtem Akkuschrauber in seiner Position verharrt. So kann beim Nieten oder Stanzen das Werkstück langsam angefahren werden.Preferably, the hydraulic tool can be set to the forward or backward position of the working piston via a control element. In the forward position of the working piston, it preferably moves forwards due to the pressure in the hydraulic fluid reservoir, whereas the working piston remains in its position in the backward position when the cordless screwdriver is not operated. This means that the workpiece can be approached slowly when riveting or punching.

Das Hydraulikwerkzeug ist vorzugsweise rein mechanisch mit dem vorstehend beschriebenen Setz- oderThe hydraulic tool is preferably purely mechanically connected to the setting or

Presswerkzeugaufsatz gekoppelt, was das Bereitstellen eines Hydraulikventils vermeidbar macht.Press tool attachment, which makes the provision of a hydraulic valve avoidable.

Vorzugsweise ist der Speicher für Hydraulikfluid hinter dem Arbeitskolben und seitlich versetzt zur Antriebswelle angeordnet.Preferably, the reservoir for hydraulic fluid is arranged behind the working piston and laterally offset from the drive shaft.

Insbesondere ist der Speicher für Hydraulikfluid derart ausgebildet, dass er in einem mit einem Schrauber verbundenen Zustand oberhalb des Gehäuses vom Schrauber angeordnet ist. So lässt sich eine kompakte Bauweise bereitstellen.In particular, the reservoir for hydraulic fluid is designed such that it is arranged above the housing of the screwdriver when connected to a screwdriver. This allows a compact design to be provided.

Es ist insbesondere vorgesehen, dass das Gehäuse des Hydraulikwerkzeugs in drei wesentliche Abschnitte eingeteilt ist.In particular, it is intended that the housing of the hydraulic tool is divided into three main sections.

Ein erster Abschnitt des Gehäuses umfasst den Arbeitsraum mit dem Arbeitskolben und ist vorzugsweise vor der Antriebswelle angeordnet (unter "vor", "hinter", "oben" und "unten" im Sinne der Erfindung wird die Position im eingebauten Zustand aus Sicht eines auf seinem Standfuß stehenden Akku-Schraubers verstanden).A first section of the housing comprises the working space with the working piston and is preferably arranged in front of the drive shaft ("in front of", "behind", "above" and "below" in the sense of the invention is understood to mean the position in the installed state from the perspective of a cordless screwdriver standing on its base).

Der angekoppelte Werkzeugsaufsatz ist vorzugsweise axial zur Antriebswelle des Schraubers angeordnet, so dass ggf. die ergonomische Form des Schraubers und dessen Bedieneinrichtung weiter genutzt werden kann.The coupled tool attachment is preferably arranged axially to the drive shaft of the screwdriver so that the ergonomic shape of the screwdriver and its operating device can continue to be used if necessary.

Ein zweiter Gehäuseabschnitt mit dem Speicher für Hydraulikfluid erstreckt sich seitlich versetzt zur Antriebswelle und ist daher im verbundenen Zustand neben oder über dem Gehäuse des Schraubers angeordnet.A second housing section with the reservoir for hydraulic fluid extends laterally offset to the Drive shaft and is therefore arranged next to or above the housing of the screwdriver when connected.

Dazwischen befindet sich ein mittlerer Gehäuseabschnitt, in welchem zumindest der Pumpkolben, welcher Teil der hydraulischen Pumpe ist, angeordnet ist.In between there is a middle housing section in which at least the pump piston, which is part of the hydraulic pump, is arranged.

Der Pumpkolben ist vorzugsweise quer, insbesondere senkrecht, zur Antriebswelle und/oder zum Arbeitskolben angeordnet. So kann der Exzenter in einer Linie mit der Antriebswelle verbunden sein und den Pumpkolben antreiben. Dies erleichtert ebenfalls die Bereitstellung eines Werkzeugs in kompakter Bauform.The pump piston is preferably arranged transversely, in particular vertically, to the drive shaft and/or the working piston. The eccentric can thus be connected in line with the drive shaft and drive the pump piston. This also makes it easier to provide a tool with a compact design.

Bei einer bevorzugten Ausführungsform der Erfindung umfasst das Hydraulikwerkzeug ein Steuerorgan, in Anhängigkeit von dessen Betätigung Hydraulikfluid in einen Arbeitsraum des Arbeitskolbens entweder vor oder hinter den Arbeitskolben gefördert wird.In a preferred embodiment of the invention, the hydraulic tool comprises a control element, depending on the actuation of which hydraulic fluid is conveyed into a working chamber of the working piston either in front of or behind the working piston.

Das Steuerorgan ist also derart ausgebildet, dass das Hydraulikwerkzeug in zwei Betriebszustände versetzt werden kann, und zwar entweder zum Pressen oder zum Ziehen.The control element is designed in such a way that the hydraulic tool can be put into two operating states, namely either for pressing or for pulling.

Zum Pressen wird von der Hydraulikpumpe Hydraulikfluid in den Arbeitsraum hinter den Arbeitskolben gepumpt, wohingegen zum Ziehen das Fluid in den Arbeitsraum vor den Arbeitskolben gepumpt wird.For pressing, the hydraulic pump pumps hydraulic fluid into the working chamber behind the working piston, whereas for pulling, the fluid is pumped into the working chamber in front of the working piston.

Hierzu ist das Steuerorgan vorzugsweise mit einem hydraulischen Steuerventil gekoppelt.For this purpose, the control element is preferably coupled to a hydraulic control valve.

Es handelt sich dabei vorzugsweise, insbesondere um die Funktionalität des automatischen Verfahrens in eine vorgegebene Endstellung, um ein federrückstellendes 5/2-Wegeventil.Preferably, this is a spring-return 5/2-way valve, in particular with regard to the functionality of the automatic movement to a predetermined end position.

Das Steuerorgan ist gemäß einer Ausführungsform der Erfindung derart ausgebildet, dass zum Vorfahren des Arbeitskolbens dieses permanent betätigt sein muss.According to one embodiment of the invention, the control element is designed such that the working piston must be permanently actuated in order to advance it.

Insbesondere ist das Hydraulikwerkzeug derart ausgebildet, dass in der Grundstellung des Steuerorgans der Arbeitskolben von der Kolbenstangenseite mit Druck beaufschlagt wird, so dass der Arbeitskolben zurückgefahren wird.In particular, the hydraulic tool is designed in such a way that in the basic position of the control element, the working piston is subjected to pressure from the piston rod side, so that the working piston is retracted.

Die Antriebswelle des Schraubers treibt die hydraulische Pumpe an und der Arbeitskolben wird mit derart hoher Kraft zurückgezogen, dass ein Umformvorgang, beispielsweise der Setzvorgang eines Blindniets, bewirkt werden kann.The drive shaft of the screwdriver drives the hydraulic pump and the working piston is retracted with such high force that a forming process, for example the setting of a blind rivet, can be carried out.

Um den Arbeitskolben, beispielsweise zum Stanzen oder Verarbeiten von zweiteiligen Nieten, über die Hydraulikpumpe vorzufahren, muss dagegen der Benutzer das Betätigungsorgan permanent betätigen.In order to advance the working piston via the hydraulic pump, for example for punching or processing two-part rivets, the user must permanently operate the actuating element.

So ist beim Pressen eine Zwei-Hand-Bedienung sichergestellt, was die Sicherheit des Hydraulikwerkzeugs erhöht.This ensures two-hand operation during pressing, which increases the safety of the hydraulic tool.

Das Steuerventil kann, wie es bei einer Ausführungsform der Erfindung vorgesehen ist, eine quer, insbesondere senkrecht zum Arbeitskolben verlaufende Stange umfassen, über welche entlang der Stange laufende Kanäle geöffnet und geschlossen werden. Das Steuerventil kann insbesondere über eine Stößelbetätigung geschaltet werden.The control valve can, as provided in one embodiment of the invention, comprise a rod running transversely, in particular perpendicularly, to the working piston, via which channels running along the rod are opened and closed. The control valve can in particular be switched via a tappet actuation.

Der Speicher für Hydraulikfluid ist der Hydraulikpumpe vorzugsweise vorgeschaltet.The reservoir for hydraulic fluid is preferably installed upstream of the hydraulic pump.

Der Speicher puffert vorzugsweise eine Menge Hydraulikfluid, die mindestens genauso groß, vorzugsweise jedoch mindestens zweimal dem Schluckvolumen des Arbeitszylinders entspricht.The accumulator preferably buffers a quantity of hydraulic fluid that is at least as large as, but preferably at least twice the displacement volume of the working cylinder.

Beispielsweise kann der Speicher für Hydraulikfluid einen mittels einer Feder vorbelasteten Kolben umfassen. Dieser Kolben übt permanent Druck auf die in dem Speicher vorhandene Hydraulikflüssigkeit aus. Alternativ ist ein Gasdruckspeicher denkbar, bei welchem eine Membran oder ein Kolben durch Gasdruck vorbelastet ist.For example, the accumulator for hydraulic fluid can comprise a piston preloaded by a spring. This piston permanently exerts pressure on the hydraulic fluid in the accumulator. Alternatively, a gas pressure accumulator is conceivable, in which a membrane or a piston is preloaded by gas pressure.

Im unbetätigten Zustand beträgt der Druck im Speicher für Hydraulikfluid vorzugsweise 5 bis 30, besonders bevorzugt 8 bis 15 bar.In the unactuated state, the pressure in the accumulator for hydraulic fluid is preferably 5 to 30, particularly preferably 8 to 15 bar.

Wird das insbesondere als 5/2 Wegeventil ausgebildete Steuerventil ohne Aktivierung des Schraubers betätigt, so fährt der Arbeitskolben allein aufgrund dieses Drucks in die vordere Endstellung. Dies erfolgt insbesondere dadurch, dass der Arbeitskolben als Differenzialkolben ausgebildet ist.If the control valve, which is designed as a 5/2-way valve, is operated without activating the screwdriver, the working piston moves to the front end position solely due to this pressure. This is achieved in particular by that the working piston is designed as a differential piston.

Vorzugsweise handelt es sich dabei um eine vordere Endstellung. So fährt der Arbeitskolben bei Betätigung des Wegeventils ohne Aktivierung des Schraubers immer vor, so dass z.B. beim Setzen eines Niets der Setzstempel langsam und ohne Energieaufwand an das Werkstück herangefahren werden kann.This is preferably a front end position. When the directional control valve is operated, the working piston always moves forward without activating the screwdriver, so that when setting a rivet, for example, the setting punch can be moved slowly and without energy expenditure towards the workpiece.

Wird das Wegeventil wieder in seine Ausgangsstellung zurückgebracht und der Schrauber betätigt, wird der Arbeitskolben zurückbewegt und der Speicher für Hydraulikfluid wieder aufgeladen, da das hinter dem Arbeitskolben befindliche Hydraulikfluid wieder zurückgefördert wird.If the directional control valve is returned to its original position and the screwdriver is operated, the working piston is moved back and the hydraulic fluid reservoir is recharged because the hydraulic fluid behind the working piston is pumped back again.

Bei einer Weiterbildung der Erfindung umfasst das Hydraulikwerkzeug ein Druckregelventil, das vorzugsweise als Vollhub-Sicherheitsventil ausgebildet ist und welches vorzugsweise die Möglichkeit bietet, den maximalen Arbeitsdruck bzw. die maximale Presskraft voreinzustellen.In a further development of the invention, the hydraulic tool comprises a pressure control valve, which is preferably designed as a full-stroke safety valve and which preferably offers the possibility of presetting the maximum working pressure or the maximum pressing force.

Ab einem vor eingestellten Höchstdruck öffnet das Ventil und verhindert ein Überschreiten des voreingestellten Betriebsdruckes und damit der zulässigen Press- oder Zugkraft. Das überströmende Hydraulikfluid fließt in den Hydraulikspeicher zurück.The valve opens when a preset maximum pressure is reached and prevents the preset operating pressure and thus the permissible pressing or pulling force from being exceeded. The overflowing hydraulic fluid flows back into the hydraulic accumulator.

Dem erfindungsgemäßen Hydraulikwerkzeug kommt zwar zugute, dass Akku-Schrauber in der Regel über eine einstellbareThe hydraulic tool according to the invention benefits from the fact that cordless screwdrivers usually have an adjustable

Drehmomentbegrenzung verfügen. Diese kann in vorteilhafter Weise verwendet werden, um die vom Arbeitskolben ausgeübte Kraft zu begrenzen.torque limitation. This can be used advantageously to limit the force exerted by the working piston.

Durch das Druckregelventil ist aber auch, falls der Benutzer die Drehmomentbegrenzung nicht aktiviert, sichergestellt, dass im Hydraulikbereich nur ein vorgegebener Höchstdruck erreicht wird, sowie dass infolge dessen auch das an der Antriebswelle vorhandene Maximaldrehmoment begrenzt ist.However, even if the user does not activate the torque limitation, the pressure control valve ensures that only a specified maximum pressure is reached in the hydraulic area and that, as a result, the maximum torque available on the drive shaft is also limited.

Gemäß der Erfindung umfasst das Hydraulikwerkzeug eine Drehmomentstütze, welche derart ausgebildet ist, dass sich diese am Gehäuse des Schraubers abstützt.According to the invention, the hydraulic tool comprises a torque support which is designed such that it is supported on the housing of the screwdriver.

Insbesondere ist die Drehmomentstütze an dem Speichergehäuse für Hydraulikfluid angeordnet.In particular, the torque support is arranged on the storage housing for hydraulic fluid.

Zum Verbinden des Hydraulikwerkzeugs mit dem Schrauber braucht so die Antriebswelle nur im Futter des Schraubers eingespannt zu werden.To connect the hydraulic tool to the screwdriver, the drive shaft only needs to be clamped into the chuck of the screwdriver.

Über die Drehmomentstütze stützt sich das Hydraulikwerkzeug auf zumindest einer Seite, vorzugsweise auf beiden Seiten des Gehäuses, ab. Es ist daher nicht erforderlich, das Gehäuse des Hydraulikwerkzeugs durch weitere Montageschritte, wie beispielsweise Verschrauben mit dem Gehäuse des Schraubers, zu koppeln.The torque arm supports the hydraulic tool on at least one side, preferably on both sides of the housing. It is therefore not necessary to couple the housing of the hydraulic tool to the housing of the screwdriver using further assembly steps, such as screwing it.

Claims (15)

  1. A hydraulic tool (1) for driving a pulling and/or pressing device (100), comprising a drive shaft (3) that can be mounted to a screwdriver (32), wherein the drive shaft (3) is operable to drive a hydraulic pump (35) that pumps hydraulic fluid into an operating chamber (19) of a hydraulic power piston (20), characterized in that the hydraulic tool (1) comprises a torque support (103) which is adapted so as to be supported on the housing (102) of the screwdriver (32).
  2. The hydraulic tool (1) of the preceding claim, wherein the hydraulic pump (35) comprises a pump piston (15) which can be driven by the drive shaft (3) to reciprocate and which pumps the hydraulic fluid into the operating chamber (19) of the hydraulic power piston (20).
  3. The hydraulic tool (1) as claimed in any of the preceding claims, wherein the power piston (20) is connected to a coupling for a setting tool or pressing tool attachment (101), in particular a setting tool or pressing tool attachment (101) which has a handle (42).
  4. The hydraulic tool (1) as claimed in any of the preceding claims, wherein a cam (23) is used to drive the pump piston (15) to reciprocate.
  5. The hydraulic tool (1) as claimed in any of the preceding claims, wherein the hydraulic tool (1) comprises a hydraulic fluid accumulator (10) which serves as a buffer volume during movement of the power piston (20).
  6. The hydraulic tool (1) of the preceding claim, wherein said hydraulic fluid accumulator(10) is arranged behind the power piston (20) and laterally offset from the drive shaft (3).
  7. The hydraulic tool (7) of the preceding claim, wherein said accumulator (10) is pressurized, in particular by a spring (12) that engages a piston such that in a non-operated state of the hydraulic tool (1) the power piston (20) moves into an end position, in particular a front end position.
  8. The hydraulic tool (1) as claimed in any of the preceding claims, wherein the hydraulic tool (1) comprises a control means (7) that is actuable to feed hydraulic fluid into an operating chamber (19) of the power piston (20) either in front of or behind the power piston (20).
  9. The hydraulic tool (1) of the preceding claim, wherein said control means is coupled to a control valve (18), in particular a 5/2-way valve.
  10. The hydraulic tool (10) as claimed in any of the two preceding claims, wherein said control means (7) is configured such that the control valve (18) has to be actuated permanently in order to advance the power piston (20).
  11. The hydraulic tool (1) as claimed in any of the two preceding claims, wherein the control valve (18) comprises a rod extending transversely, in particular perpendicular to the power piston (20), and which serves to open and close passages extending along the rod.
  12. The hydraulic tool (1) as claimed in any of the preceding claims, wherein the hydraulic tool (1) comprises a pressure control valve (8) which allows hydraulic fluid to flow back into the hydraulic fluid accumulator (10) once a predetermined maximum pressure is exceeded.
  13. The hydraulic tool (1) as claimed in any of the preceding claims, wherein the torque support (103) is preferably mounted to a hydraulic fluid accumulator housing.
  14. The hydraulic tool (1) as claimed in any of the preceding claims, wherein the power piston (20) is aligned parallel to the drive shaft (3), in particular coaxially thereto.
  15. The hydraulic tool (1) as claimed in any of the preceding claims, wherein the hydraulic tool is coupled to a screwdriver (32), in particular a cordless screwdriver, and/or wherein an elastic coupling (117) is arranged between the drive shaft (3) and the hydraulic pump (35), and/or wherein the hydraulic tool comprises a chuck lock (120) for the screwdriver, in particular for a cordless screwdriver, and/or wherein the hydraulic tool (1) comprises a drive shaft (3) with a flywheel (121), in particular a flywheel in the form of a bell of a chuck lock (120) for the screwdriver.
EP18830478.6A 2017-12-21 2018-12-20 Hydraulic tool for a pulling and/or pressing device Active EP3731997B1 (en)

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EP3731997A1 (en) 2020-11-04
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WO2019122243A1 (en) 2019-06-27
US20200316765A1 (en) 2020-10-08

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