EP1157786A2 - Press tool for crimping connection elements - Google Patents

Press tool for crimping connection elements Download PDF

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Publication number
EP1157786A2
EP1157786A2 EP01810398A EP01810398A EP1157786A2 EP 1157786 A2 EP1157786 A2 EP 1157786A2 EP 01810398 A EP01810398 A EP 01810398A EP 01810398 A EP01810398 A EP 01810398A EP 1157786 A2 EP1157786 A2 EP 1157786A2
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EP
European Patent Office
Prior art keywords
valve
piston
press tool
hydraulic
tool according
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
EP01810398A
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German (de)
French (fr)
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EP1157786B1 (en
EP1157786A3 (en
Inventor
René Amherd
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.)
Von Arx AG
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Von Arx AG
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Publication date
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Publication of EP1157786A2 publication Critical patent/EP1157786A2/en
Publication of EP1157786A3 publication Critical patent/EP1157786A3/en
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Publication of EP1157786B1 publication Critical patent/EP1157786B1/en
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    • 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

Definitions

  • the present invention relates to a portable, hydraulic working pressing tool for pressing Coupling elements, with a fork-shaped receptacle and a clamp held in this recording, which by means of a piston-cylinder unit with an integrated return spring Is operable, which the features of the preamble of Claim 1.
  • Portable, hydraulic pressing tools at the beginning mentioned type are used for pressing coupling elements, such as press sleeves, press fittings, pipe sockets, one inside the other pushed pipe sections and the like used.
  • the Crimping tools have a clamp with jaws, which a press room for receiving the to be pressed Form coupling element.
  • the one necessary for the pressing Pressing pressure is from a, generally hydraulic, Drive supplied.
  • the devices of interest here preferably on Construction sites are used, it is usually about electrically operated devices.
  • electrically operated devices For example, be pure refer to US-A-5,040,400, in which a pneumatic working device is shown.
  • electrically operated press tool devices such as they are known, for example, from EP-A-0'712'696 (Pamag AG) are.
  • Most of these devices are powered by the network.
  • the availability of electrical connections is often high low on construction sites. Therefore it is desirable to be able to work independently of the network by using the device a battery is operated.
  • the performance of battery-operated devices is very high energy-efficient mode of operation dependent, so a reasonable operating time can be achieved per battery charge.
  • This task is performed by a portable, hydraulically working Press tool with the features of claim 1.
  • the solution according to the invention is implemented by Use a gear pump. Since a gear pump with sufficient power requires a relatively large amount of space Arrangement in the device is crucial to the to achieve the above-mentioned solution without the device to enlarge considerably, which makes it by the corresponding additional weight becomes unwieldy.
  • the invention achieves this by using a modular design on the one hand where the gear pump is on the one hand in the hydraulic block is arranged, however, on the other hand in the two adjacent modules on both sides of the hydraulic block. This also results in an extremely compact arrangement with correspondingly short hydraulic lines and leads corresponding to one, despite built-in batteries, relative light pressing tool.
  • the pressing tool 0 is an electro-hydraulic device, which is implemented here as a battery-operated device.
  • the Press tool 0 has a press tool functional unit 2 a handle 1 is formed.
  • a battery housing 6 on the functional unit 2 molded as a removable part.
  • the pressing tool functional unit 2 is a fork-shaped one Recording 3 recognizable.
  • the clamp 4 held. This is by means of a Safety bolt 5 held securely in the receptacle 3.
  • a trigger switch 8 available for the operation of the device.
  • the actual structure of the press tool functional unit 2 can be seen in FIG.
  • For the drive provides Electric motor 10, which is powered by the battery supply 7. Between the electric motor 10 and the battery 7 is the Trigger switch 8 arranged.
  • the electric motor 10 has one Output shaft 11 with an output pinion 12 at the end.
  • This drive pinion 12 meshes a gear wheel 13, which is mounted on a transmission output shaft 16.
  • the transmission output shaft 16 is mounted on the one hand in a gearbox bearing 14 and on the other hand in a gear housing 15, which the Transmission output shaft 16 penetrates sealingly.
  • the transmission output shaft 16 one of the two rotor shafts 19 of a gear pump 18 (see Figure 3).
  • the lower rotor shaft 19 is also in the gear housing 15 stored.
  • the counter bearings of both rotor shafts 19 are in the Cylinder housing 21 of the piston-cylinder unit 20 in corresponding plain bearings held.
  • the hydraulic block 17 already mentioned is thus of the two rotors or rotor shafts 19 of the Gear pump 18 fully penetrated.
  • a muzzle pin 27 mounted which communicates with one on the one hand volume-variable reservoir 28 communicates and on the other hand via appropriate pilot holes in Hydraulic block via a valve unit 31 with the Gear pump 18 is connected.
  • a flow line 29 and a pressure line 30 as bores realized, through which the mentioned mouth pin 27 with the Gear pump 18 on the one hand and the gear pump on the other hand 18 in communication with the piston-cylinder unit 20 Connection is established.
  • a piston chamber return 26 is provided, via the Hydraulic oil displaced during the load stroke via the Muzzle pin 27 in the volume-variable reservoir 28 can be returned or at the provision hydraulic oil into the piston chamber accordingly can be traced back.
  • a gear pump 18 becomes a particularly simple one constructive solution offered and on the other hand thanks to the a relatively large gear pump that can be realized in this way Delivery rate achieved, which is a short Operating time per stroke.
  • the inventive Arrangement and use of the gear pump also allows extremely simple and short hydraulic oil delivery paths, which minimizes the sealing problems and on the other hand the lines that are manufactured as bores are to be realized with a relatively large cross-section. This minimizes flow losses.
  • the piston-cylinder unit 20 with the cylinder housing 21 is with the exception of the integrated slide bearings for the rotor shafts the gear pump, conventionally designed.
  • the cylinder housing 21 supports the piston 20, on which a return spring 25 works.
  • the piston 22 moves in via the piston rod 23 Roller bearing 24 for actuating the clamping tongs 4.
  • valve unit 31 has two screwable together Housing parts, the one housing part the first, flow switching valve 32 records while the second, larger Housing part receives a ball valve 38 as a second valve.
  • the first valve 32 is from the second valve 38 through a Valve plate 37 separated.
  • a hollow piston 33 is axially displaceable stored.
  • the path of the hollow piston 33 is through on the input side a snap ring 52 and on the other hand through the Valve plate 37 limited.
  • the hollow piston 33 is on the Valve plate 37 fully open towards the side, while in the closed piston head end a relative small relief bore 34 is arranged.
  • the housing part 33 'thus forms the cylinder of the valve in which the hollow piston 33 is axially movably mounted.
  • a return pressure spring 36 In the hollow piston 33 engages a return pressure spring 36, the one hand inside rests on the piston head and on the other hand on the valve plate 37 supports.
  • the applied oil pressure D shifts the Hollow piston 33 against the force of the return pressure spring 36 to the hollow piston 33 the lateral flow openings 35 to Releases the print train. This reaches the pressure line 30 Hydraulic oil in the piston cylinder unit 20 and shifts the piston 22, the roller bearing with its piston rod 23 24 moves, which leads to the actuation of the clamp 4.
  • the second valve 38 is around a ball valve. On the one hand, this stands above the Return bore 39 in communicating connection with the Pressure line and on the other hand via the through hole 40 through the valve plate 37 in connection with the cylinder 33 ' of the first valve. However, this connection is made by the Valve ball 41 opened depending on pressure closed.
  • the second valve 38 has a valve body 42 with a valve body foot 43.
  • the valve body foot 43 has the shape of a circular disc, which is integral with the Valve body 42 is connected and in the center one Ball seat 53 is inserted, in which the valve ball 41st partially stored.
  • the valve plate 37 forms the valve seat for the valve ball 41.
  • a spring counter bearing 45 in the shape of a ring screwed in.
  • this compression spring 46 determines the Switching pressure. If the changeover pressure is reached, the Valve ball 41 raised, on the hollow piston 33 arises Back pressure and the hollow piston 33 is with the help of Return pressure spring 36 back to the circlip 52 moved, the flow openings 35 closed become. This is irrespective of whether the gear pump 18 continues to promote or not.
  • a push button 48 is by means of a Return spring 47 held in the starting position.
  • the head 49 will swung to the side, the entire Valve body 42 participates in this pivoting movement.
  • the valve body foot 43 lifts in the Slightly off the middle, which relieves the pressure on the valve ball 41 is.
  • the pressure can now pass through the through hole 40 in the valve plate 37 and the first valve 32 closes again.
  • the hollow piston 33 moves jerkily back. For the user, hitting the Valve audible. As soon as he hears the valve closing, he will consequently release the trigger switch 8. But it is quite possible in the cylinder 33 'of the first valve 32 in to arrange a sensor 51 on the lower area Trigger switch 8 acts, or the feed line from the battery 7 to the electric motor 10. This sensor is activated with a time delay so that it is only activated when the Hollow piston 33 in the open state is activated and thus only realized the closing process. Through one Sensor 51 can ensure that the user Energy source not unnecessarily burdened after completing one Stroke.
  • the variant shown here shows a battery powered device.
  • the invention therefore also refers to network-dependent pressing tools.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Press Drives And Press Lines (AREA)
  • Hydraulic Motors (AREA)
  • Reciprocating Pumps (AREA)
  • Mounting, Exchange, And Manufacturing Of Dies (AREA)

Abstract

The device has a forked holder for jaws actuated by a piston-cylinder unit with an integral restoring spring and a hydraulic gear wheel pump driven by an electric motor to generate the pressure applied to the unit. The pump rotor shafts are mounted in a gearbox output shaft bearing housing and the piston-cylinder unit housing. All hydraulic pressure lines are bores in a hydraulic block in which the pump rotor shafts and a valve unit are mounted. The portable, hydraulic device has a forked holder for clamping jaws actuated by a piston-cylinder unit with an integral restoring spring and a hydraulic gear wheel pump driven by an electric motor to generate the pressure applied to the piston-cylinder unit. The pump (18) rotor shafts (19) are mounted in a bearing housing for a gearbox output shaft and in the piston-cylinder unit housing. All hydraulic pressure lines are bores in a hydraulic block (17) in which the pump rotor shafts and a valve unit (31) are also mounted.

Description

Die vorliegende Erfindung betrifft ein tragbares, hydraulisch arbeitendes Presswerkzeug für die Verpressung von Kupplungselementen, mit einer gabelförmigen Aufnahme und einer in dieser Aufnahme gehaltenen Klemmzange, die mittels einer Kolbenzylindereinheit mit integrierter Rückstellfeder betätigbar ist, welches die Merkmale des Oberbegriffes des Patentanspruches 1 aufweist.The present invention relates to a portable, hydraulic working pressing tool for pressing Coupling elements, with a fork-shaped receptacle and a clamp held in this recording, which by means of a piston-cylinder unit with an integrated return spring Is operable, which the features of the preamble of Claim 1.

Tragbare, hydraulisch arbeitende Presswerkzeuge der eingangs genannten Art werden zur Verpressung von Kupplungselementen, wie Presshülsen, Pressfittinge, Rohrmuffen, ineinander geschobene Rohrabschnitte und ähnlichem eingesetzt. Die Presswerkzeuge weisen eine Klemmzange mit Klemmbacken auf, welche einen Pressraum zur Aufnahme des zu verpressenden Kupplungselementes bilden. Der für die Verpressung notwendige Pressdruck wird von einem, im allgemeinen hydraulischen, Antrieb geliefert. Portable, hydraulic pressing tools at the beginning mentioned type are used for pressing coupling elements, such as press sleeves, press fittings, pipe sockets, one inside the other pushed pipe sections and the like used. The Crimping tools have a clamp with jaws, which a press room for receiving the to be pressed Form coupling element. The one necessary for the pressing Pressing pressure is from a, generally hydraulic, Drive supplied.

Weil die hier interessierenden Geräte vorzugsweise auf Baustellen eingesetzt werden, handelt es sich meist um elektrisch betriebene Geräte. Rein beispielsweise sei jedoch auf die US-A-5,040,400 verwiesen, in der ein pneumatisch arbeitendes Gerät dargestellt ist. Wesentlich verbreiteter sind jedoch elektrisch betriebene Presswerkzeuggeräte, wie sie beispielsweise aus der EP-A-0'712'696 (Pamag AG) bekannt sind. Meistens sind diese Geräte über das Netz gespiesen. Vielfach ist die Verfügbarkeit von elektrischen Anschlüssen auf Baustellen jedoch gering. Daher ist es wünschenswert netzunabhängig arbeiten zu können, indem das Gerät mittels eines Akkus betrieben wird. Bekanntlich ist jedoch die Leistungsfähigkeit akkubetriebener Geräte stark von einer energieökonomischen Betriebsweise abhängig, damit eine vernünftige Betriebsdauer pro Akkuladung erzielt werden kann.Because the devices of interest here preferably on Construction sites are used, it is usually about electrically operated devices. For example, be pure refer to US-A-5,040,400, in which a pneumatic working device is shown. Much more common are, however, electrically operated press tool devices, such as they are known, for example, from EP-A-0'712'696 (Pamag AG) are. Most of these devices are powered by the network. The availability of electrical connections is often high low on construction sites. Therefore it is desirable to be able to work independently of the network by using the device a battery is operated. However, it is known that The performance of battery-operated devices is very high energy-efficient mode of operation dependent, so a reasonable operating time can be achieved per battery charge.

Bei den bisher auf dem Markt erhältlichen hydraulisch arbeitenden Presswerkzeugen werden unabhängig der Art der elektrischen Speisung Rotationspumpen oder Kolbenpumpen eingesetzt. Alle bisher bekannten Systeme haben eine relativ geringe Förderleistung und entsprechend ist die Betriebsdauer pro Hub der zu betätigenden Kolbenzylindereinheit relativ lang. Während dies bei netzabhängigen Geräten unbedeutend ist, ist bei akkubetriebenen Geräten diese Betriebszeit von ausschlaggebender Bedeutung. In the hydraulic systems previously available on the market working press tools are independent of the type of electrical supply rotary pumps or piston pumps used. All previously known systems have a relative low delivery rate and the operating time is corresponding relative to the stroke of the piston-cylinder unit to be actuated long. While this is insignificant for network-dependent devices is, this operating time of battery-operated devices of crucial importance.

Aus der US-A-5'125'324 ist ein netzbetriebenes Gerät der eingangs beschriebenen Art bekannt, welches ansonsten die Merkmale des Oberbegriffes des Patentanspruches 1 aufweist. Die hydraulische Pumpe, die hier als Kolbenpumpe realisiert ist, wirkt auf eine Kolbenzylindereinheit mit integrierter Rückstellfeder, wobei die Pumpe vollständig in einem Hydraulikblock angeordnet ist, der zwischen dem antriebsseitigen Getriebe und einer Kolbenzylindereinheit angeordnet ist.From US-A-5'125'324 is a mains operated device known type initially known, which otherwise the Features of the preamble of claim 1. The hydraulic pump, which is implemented here as a piston pump acts on a piston-cylinder unit with an integrated Return spring, the pump completely in one Hydraulic block is arranged between the drive-side gear and a piston-cylinder unit is arranged.

Es ist die Aufgabe der vorliegenden Erfindung, ein tragbares, hydraulisch arbeitendes Presswerkzeug gemäss Oberbegriff des Patentanspruches 1 so zu gestalten, dass die Betriebsdauer pro durchzuführenden Pressvorgang möglichst kurz ist und somit die Betriebsdauer pro Ladung der Akkus bei akkubetriebenen Geräten für möglichst viele Pressvorgänge reicht. Es ist ferner die Aufgabe der Erfindung, ein möglichst kompaktes, entsprechend leichtes und preiswert herstellbares Presswerkzeug zu schaffen.It is the object of the present invention to provide a portable, hydraulically operating pressing tool according to the preamble of To design claim 1 so that the operating time is as short as possible per pressing operation to be carried out and thus the operating time per charge of the batteries battery-operated devices for as many pressing processes as possible enough. It is also the object of the invention to provide a as compact as possible, correspondingly light and inexpensive to create producible pressing tool.

Diese Aufgabe erfüllt ein tragbares, hydraulisch arbeitendes Presswerkzeug mit den Merkmalen des Patentanspruches 1. Realisiert wird die erfindungsgemässe Lösung durch die Verwendung einer Zahnradpumpe. Da eine Zahnradpumpe mit genügender Leistung relativ viel Platz benötigt, ist deren Anordnung im Gerät von ausschlaggebender Bedeutung, um die genannte Lösung erzielen zu können, ohne dabei das Gerät erheblich zu vergrössern, wodurch es allein schon durch das entsprechende Mehrgewicht unhandlich wird. Die Erfindung erreicht dies, indem einerseits eine Modulbauweise angewendet wird, bei der die Zahnradpumpe einerseits im Hydraulikblock angeordnet ist, jedoch andererseits in den beiden benachbarten Modulen beidseits des Hydraulikblockes lagert. Dies ergibt zudem eine äusserst kompakte Anordnung mit entsprechend kurzen hydraulischen Leitungen und führt entsprechend zu einem, trotz eingebauten Akkus, relativ leichten Presswerkzeug.This task is performed by a portable, hydraulically working Press tool with the features of claim 1. The solution according to the invention is implemented by Use a gear pump. Since a gear pump with sufficient power requires a relatively large amount of space Arrangement in the device is crucial to the to achieve the above-mentioned solution without the device to enlarge considerably, which makes it by the corresponding additional weight becomes unwieldy. The invention achieves this by using a modular design on the one hand where the gear pump is on the one hand in the hydraulic block is arranged, however, on the other hand in the two adjacent modules on both sides of the hydraulic block. This also results in an extremely compact arrangement with correspondingly short hydraulic lines and leads corresponding to one, despite built-in batteries, relative light pressing tool.

Weitere erfindungsgemässe vorteilhafte Ausgestaltungsformen des hydraulisch arbeitenden Presswerkzeuges gehen aus den abhängigen Ansprüchen hervor und deren Bedeutung ist in der nachfolgenden Beschreibung mit Bezug auf die Zeichnungen erläutert. Es zeigt:

Figur 1
das erfindungsgemässe Presswerkzeug in der Gesamtansicht in perspektivischer Darstellung.
Figur 2
die Funktionseinheit des Presswerkzeuges in einem vertikalen Längsschnitt und
Figur 3
in einem vertikalen Querschnitt in vereinfachter Darstellung.
Figur 4
zeigt vereinfacht einen Längsschnitt durch die Ventileinheit, die hier separat dargestellt ist.
Further advantageous embodiments of the hydraulically operating pressing tool according to the invention emerge from the dependent claims and their meaning is explained in the following description with reference to the drawings. It shows:
Figure 1
the pressing tool according to the invention in a general view in perspective.
Figure 2
the functional unit of the pressing tool in a vertical longitudinal section and
Figure 3
in a vertical cross section in a simplified representation.
Figure 4
shows simplified a longitudinal section through the valve unit, which is shown separately here.

Das Presswerkzeug 0 ist ein elektrohydraulisches Gerät, welches hier als akkubetriebenes Gerät realisiert ist. Das Presswerkzeug 0 hat eine Presswerkzeugfunktionseinheit 2, an der ein Griff 1 angeformt ist. In der rückwärtigen Verlängerung ist an der Funktionseinheit 2 ein Akkugehäuse 6 als abnehmbarer Teil angeformt. In der vorderen Verlängerung der Presswerkzeugfunktionseinheit 2 ist eine gabelförmige Aufnahme 3 erkennbar. In der gabelförmigen Aufnahme 3 wird die Klemmzange 4 gehalten. Diese ist mittels einem Sicherungsbolzen 5 in der Aufnahme 3 gesichert gehalten. Für die Betätigung des Gerätes ist wie üblich ein Auslöseschalter 8 vorhanden.The pressing tool 0 is an electro-hydraulic device, which is implemented here as a battery-operated device. The Press tool 0 has a press tool functional unit 2 a handle 1 is formed. In the back Extension is a battery housing 6 on the functional unit 2 molded as a removable part. In the front extension the pressing tool functional unit 2 is a fork-shaped one Recording 3 recognizable. In the fork-shaped receptacle 3 the clamp 4 held. This is by means of a Safety bolt 5 held securely in the receptacle 3. For the operation of the device is, as usual, a trigger switch 8 available.

Der eigentliche Aufbau der Presswerkzeugfunktionseinheit 2 ist in der Figur 2 ersichtlich. Für den Antrieb sorgt ein Elektromotor 10, der von der Akkuspeisung 7 gespiesen ist. Zwischen dem Elektromotor 10 und dem Akku 7 ist der Auslöseschalter 8 angeordnet. Der Elektromotor 10 hat eine Abtriebswelle 11 mit einem endseitigen Abtriebritzel 12. Dieses Abtriebritzel 12 kämmt ein Getriebezahnrad 13, welches auf eine Getriebeabtriebswelle 16 montiert ist. Die Getriebeabtriebswelle 16 lagert einerseits in einem Getriebelager 14 und andererseits in einem Getriebegehäuse 15, welches die Getriebeabtriebswelle 16 dichtend durchsetzt. In der Fortsetzung bildet die Getriebeabtriebswelle 16 eine der beiden Rotorwellen 19 einer Zahnradpumpe 18 (siehe Figur 3).The actual structure of the press tool functional unit 2 can be seen in FIG. For the drive provides Electric motor 10, which is powered by the battery supply 7. Between the electric motor 10 and the battery 7 is the Trigger switch 8 arranged. The electric motor 10 has one Output shaft 11 with an output pinion 12 at the end. This drive pinion 12 meshes a gear wheel 13, which is mounted on a transmission output shaft 16. The transmission output shaft 16 is mounted on the one hand in a gearbox bearing 14 and on the other hand in a gear housing 15, which the Transmission output shaft 16 penetrates sealingly. In the Continuation forms the transmission output shaft 16 one of the two rotor shafts 19 of a gear pump 18 (see Figure 3).

Die untere Rotorwelle 19 ist ebenfalls im Getriebegehäuse 15 gelagert. Die Gegenlager beider Rotorwellen 19 sind im Zylindergehäuse 21 der Kolbenzylindereinheit 20 in entsprechenden Gleitlagern gehalten.The lower rotor shaft 19 is also in the gear housing 15 stored. The counter bearings of both rotor shafts 19 are in the Cylinder housing 21 of the piston-cylinder unit 20 in corresponding plain bearings held.

Der bereits erwähnte Hydraulikblock 17 wird somit von den beiden Rotoren beziehungsweise Rotorwellen 19 der Zahnradpumpe 18 vollständig durchsetzt. Im selben Hydraulikblock 17 ist zuunterst ein Mündungszapfen 27 montiert, der kommunizierend einerseits mit einem volumenveränderbaren Reservoir 28 in Verbindung steht und andererseits über entsprechende Vorlaufbohrungen im Hydraulikblock via einer Ventileinheit 31 mit der Zahnradpumpe 18 verbunden ist. Im Hydraulikblock sind ferner ein Vorlaufstrang 29 und ein Druckstrang 30 als Bohrungen realisiert, über die der erwähnte Mündungszapfen 27 mit der Zahnradpumpe 18 einerseits und andererseits die Zahnradpumpe 18 mit der Kolbenzylindereinheit 20 in kommunizierender Verbindung steht. Ausserhalb des Hydraulikblockes 17 ist lediglich ein Kolbenraumrücklauf 26 vorgesehen, über den während des Lasthubes verdrängtes Hydrauliköl via den Mündungszapfen 27 in das volumenveränderbare Reservoir 28 rückgeführt werden kann beziehungsweise bei der Rückstellung des Kolbens entsprechend wieder Hydrauliköl in den Kolbenraum zurückgeführt werden kann.The hydraulic block 17 already mentioned is thus of the two rotors or rotor shafts 19 of the Gear pump 18 fully penetrated. In the same Hydraulic block 17 is at the bottom a muzzle pin 27 mounted, which communicates with one on the one hand volume-variable reservoir 28 communicates and on the other hand via appropriate pilot holes in Hydraulic block via a valve unit 31 with the Gear pump 18 is connected. In the hydraulic block are also a flow line 29 and a pressure line 30 as bores realized, through which the mentioned mouth pin 27 with the Gear pump 18 on the one hand and the gear pump on the other hand 18 in communication with the piston-cylinder unit 20 Connection is established. Outside of the hydraulic block 17 only a piston chamber return 26 is provided, via the Hydraulic oil displaced during the load stroke via the Muzzle pin 27 in the volume-variable reservoir 28 can be returned or at the provision hydraulic oil into the piston chamber accordingly can be traced back.

Dank der erfindungsgemässen Anordnung und der Verwendung einer Zahnradpumpe 18 wird einerseits eine besonders einfache konstruktive Lösung angeboten und andererseits dank der relativ grossen so realisierbaren Zahnradpumpe eine grosse Förderleistung erzielt, die entsprechend eine kurze Betriebsdauer pro Hub bewirkt. Die erfindungsgemässe Anordnung und Verwendung der Zahnradpumpe erlaubt ferner äusserst einfache und kurze Förderwege des Hydrauliköls, wodurch einerseits die Dichtungsprobleme minimalisiert sind und andererseits die Leitungen, die als Bohrungen gefertigt sind, mit relativ grossen Querschnitt zu realisieren. Hierdurch sind Strömungsverluste minimalisiert.Thanks to the arrangement and use according to the invention a gear pump 18 becomes a particularly simple one constructive solution offered and on the other hand thanks to the a relatively large gear pump that can be realized in this way Delivery rate achieved, which is a short Operating time per stroke. The inventive Arrangement and use of the gear pump also allows extremely simple and short hydraulic oil delivery paths, which minimizes the sealing problems and on the other hand the lines that are manufactured as bores are to be realized with a relatively large cross-section. This minimizes flow losses.

Die Kolbenzylindereinheit 20 mit dem Zylindergehäuse 21 ist, mit Ausnahme der integrierten Gleitlager für die Rotorwellen der Zahnradpumpe, herkömmlich gestaltet. Im Zylindergehäuse 21 lagert der Kolben 20, auf den eine Rückstellfeder 25 wirkt. Der Kolben 22 verschiebt via der Kolbenstange 23 ein Rollenlager 24 zur Betätigung der Klemmzange 4.The piston-cylinder unit 20 with the cylinder housing 21 is with the exception of the integrated slide bearings for the rotor shafts the gear pump, conventionally designed. In the cylinder housing 21 supports the piston 20, on which a return spring 25 works. The piston 22 moves in via the piston rod 23 Roller bearing 24 for actuating the clamping tongs 4.

Ein weiterer Vorteil der erfindungsgemässen Lösung besteht darin, dass nicht eine Vielzahl von Ventilen erforderlich ist, die zu erheblichen Strömungsverlusten führen, sondern dass eine einzige Ventileinheit 31 hierzu genügt. Diese Ventileinheit erlaubt grosse Durchlässe in Vorlaufrichtung, wodurch die erwähnten Verluste sehr gering gehalten werden. Bezüglich des Aufbaues der Ventileinheit 31 wird auf die Figur 4 verwiesen, in der dieselbe vereinfacht dargestellt ist. Die Ventileinheit 31 hat zwei miteinander verschraubbare Gehäuseteile, wobei der eine Gehäuseteil das erste, Vorlaufumschaltventil 32 aufnimmt, während der zweite, grössere Gehäuseteil ein Kugelventil 38 als zweites Ventil aufnimmt. Das erste Ventil 32 ist vom zweiten Ventil 38 durch eine Ventilplatte 37 getrennt. Im Gehäuse des ersten, Vorlaufumschaltventiles 32 ist ein Hohlkolben 33 axial verschiebbar gelagert. Der Weg des Hohlkolbens 33 ist eingangsseitig durch einen Sicherungsring 52 und auf der anderen Seite durch die Ventilplatte 37 begrenzt. Der Hohlkolben 33 ist an der zur Ventilplatte 37 hin gerichteten Seite vollständig offen, während im geschlossenen kolbenkopfseitigen Ende eine relativ kleine Entlastungsbohrung 34 angeordnet ist. Der Gehäuseteil 33' bildet somit den Zylinder des Ventils, in dem der Hohlkolben 33 axial beweglich gelagert ist. In den Hohlkolben 33 greift eine Rückstelldruckfeder 36 ein, die einerseits innen am Kolbenkopf aufliegt und andererseits sich auf der Ventilplatte 37 abstützt. Der anliegende Oeldruck D verschiebt den Hohlkolben 33 gegen die Kraft der Rückstelldruckfeder 36, bis der Hohlkolben 33 die seitlichen Vorlauföffnungen 35 zum Druckstrang freigibt. Ueber den Druckstrang 30 gelangt das Hydrauliköl in die Kolbenzylindereinheit 20 und verschiebt den Kolben 22, der mit seiner Kolbenstange 23 das Rollenlager 24 verschiebt, welches zur Betätigung der Klemmzange 4 führt.Another advantage of the solution according to the invention is in that a multitude of valves is not required is, which lead to significant flow losses, but that a single valve unit 31 is sufficient for this. This Valve unit allows large passages in the flow direction, whereby the losses mentioned are kept very low. Regarding the structure of the valve unit 31, reference is made to the Figure 4 referenced, in which the same is shown in simplified form is. The valve unit 31 has two screwable together Housing parts, the one housing part the first, flow switching valve 32 records while the second, larger Housing part receives a ball valve 38 as a second valve. The first valve 32 is from the second valve 38 through a Valve plate 37 separated. In the housing of the first, flow switch valve 32, a hollow piston 33 is axially displaceable stored. The path of the hollow piston 33 is through on the input side a snap ring 52 and on the other hand through the Valve plate 37 limited. The hollow piston 33 is on the Valve plate 37 fully open towards the side, while in the closed piston head end a relative small relief bore 34 is arranged. The housing part 33 'thus forms the cylinder of the valve in which the hollow piston 33 is axially movably mounted. In the hollow piston 33 engages a return pressure spring 36, the one hand inside rests on the piston head and on the other hand on the valve plate 37 supports. The applied oil pressure D shifts the Hollow piston 33 against the force of the return pressure spring 36 to the hollow piston 33 the lateral flow openings 35 to Releases the print train. This reaches the pressure line 30 Hydraulic oil in the piston cylinder unit 20 and shifts the piston 22, the roller bearing with its piston rod 23 24 moves, which leads to the actuation of the clamp 4.

Beim zweiten Ventil 38 handelt es sich, wie bereits erwähnt, um ein Kugelventil. Dieses steht einerseits über die Rücklaufbohrung 39 in kommunizierender Verbindung mit der Druckleitung und andererseits über die Durchgangsbohrung 40 durch die Ventilplatte 37 in Verbindung mit dem Zylinder 33' des ersten Ventils. Diese Verbindung wird jedoch durch die Ventilkugel 41 druckabhängig geöffnet beziehungsweise geschlossen. Das zweite Ventil 38 hat einen Ventilkörper 42 mit einem Ventilkörperfuss 43. Der Ventilkörperfuss 43 hat die Form einer kreisrunden Scheibe, die einstückig mit dem Ventilkörper 42 verbunden ist und in der zentrisch eine Kugelaufnahme 53 eingelassen ist, in der die Ventilkugel 41 teilweise lagert. Die Ventilplatte 37 bildet den Ventilsitz für die Ventilkugel 41. Im Gehäuse 54 des zweiten Ventils ist ein Federgegenlager 45 in der Gestalt eines Ringes eingeschraubt. Zwischen dem Federgegenlager 45 und dem Ventilkörperfuss 43 ist eine Druckfeder 46 angeordnet. Die Charakteristik dieser Druckfeder 46 bestimmt den Umschaltdruck. Wird der Umschaltdruck erreicht, so wird die Ventilkugel 41 angehoben, auf den Hohlkolben 33 entsteht ein Gegendruck und der Hohlkolben 33 wird mit Hilfe der Rückstelldruckfeder 36 zurück zum Sicherungsring 52 verschoben, wobei die Vorlauföffnungen 35 verschlossen werden. Dies ist unabhängig davon, ob die Zahnradpumpe 18 weiterhin noch fördert oder nicht.As already mentioned, the second valve 38 is around a ball valve. On the one hand, this stands above the Return bore 39 in communicating connection with the Pressure line and on the other hand via the through hole 40 through the valve plate 37 in connection with the cylinder 33 ' of the first valve. However, this connection is made by the Valve ball 41 opened depending on pressure closed. The second valve 38 has a valve body 42 with a valve body foot 43. The valve body foot 43 has the shape of a circular disc, which is integral with the Valve body 42 is connected and in the center one Ball seat 53 is inserted, in which the valve ball 41st partially stored. The valve plate 37 forms the valve seat for the valve ball 41. In the housing 54 of the second valve a spring counter bearing 45 in the shape of a ring screwed in. Between the spring counter bearing 45 and the A valve spring 43 is arranged a compression spring 46. The Characteristic of this compression spring 46 determines the Switching pressure. If the changeover pressure is reached, the Valve ball 41 raised, on the hollow piston 33 arises Back pressure and the hollow piston 33 is with the help of Return pressure spring 36 back to the circlip 52 moved, the flow openings 35 closed become. This is irrespective of whether the gear pump 18 continues to promote or not.

Kommt es aus hier nicht weiter zu erörternden Gründen zu einer Blockierung oder einer unvollständigen Hubauslösung, so kann über manuelle Betätigung einer Drucktaste 48 der Druck abgebaut werden. Die Drucktaste 48 ist mittels einer Rückstellfeder 47 in der Ausgangsposition gehalten. Durch Druck auf die Drucktaste 48 kommt ein gerundeter Kopf 49 des Ventilkörpers 42 in eine exzentrische Bohrung, die als Kippfläche 50 bezeichnet ist, zu liegen. Der Kopf 49 wird dabei zur Seite hin geschwenkt, wobei der gesamte Ventilkörper 42 diese Schwenkbewegung mitmacht. Dabei kommt der Ventilkörperfuss 43 mit einer Kippkante 44 auf der Ventilplatte 37 einseitig zum Anliegen und schwenkt um den Anlagepunkt. In der Folge hebt der Ventilkörperfuss 43 in der Mitte leicht ab, wodurch die Ventilkugel 41 druckentlastet ist. Der Druck kann sich nun durch die Durchgangsbohrung 40 in der Ventilplatte 37 abbauen und das erste Ventil 32 schliesst wiederum.There are reasons not to be discussed here a blockage or an incomplete stroke triggering, so can the pressure by manual actuation of a push button 48 be dismantled. The push button 48 is by means of a Return spring 47 held in the starting position. By Pressing the push button 48 comes a rounded head 49 of the Valve body 42 in an eccentric bore, which as Tilt surface 50 is designated to lie. The head 49 will swung to the side, the entire Valve body 42 participates in this pivoting movement. Here comes the valve body foot 43 with a tilting edge 44 on the Valve plate 37 on one side to rest and swings around Contact point. As a result, the valve body foot 43 lifts in the Slightly off the middle, which relieves the pressure on the valve ball 41 is. The pressure can now pass through the through hole 40 in the valve plate 37 and the first valve 32 closes again.

Beim Schliessen des ersten Ventils 32 fährt der Hohlkolben 33 ruckartig zurück. Für den Benützer ist das Schlagen des Ventils hörbar. Sobald er das Schliessen des Ventils hört, wird er folglich den Auslöseschalter 8 loslassen. Es ist aber durchaus möglich, im Zylinder 33' des ersten Ventils 32 im unteren Bereich einen Sensor 51 anzuordnen, der auf den Auslöseschalter 8 wirkt, beziehungsweise die Speiseleitung vom Akku 7 zum Elektromotor 10 unterbricht. Dieser Sensor wird zeitverzögert aktiviert, so dass er erst wenn der Hohlkolben 33 im Oeffnungszustand ist aktiviert ist und somit erst den Schliessvorgang realisiert. Durch einen solchen Sensor 51 kann sichergestellt werden, dass der Benützer die Energiequelle nicht unnötig belastet nach Abschluss einer Hubbewegung.When the first valve 32 is closed, the hollow piston 33 moves jerkily back. For the user, hitting the Valve audible. As soon as he hears the valve closing, he will consequently release the trigger switch 8. But it is quite possible in the cylinder 33 'of the first valve 32 in to arrange a sensor 51 on the lower area Trigger switch 8 acts, or the feed line from the battery 7 to the electric motor 10. This sensor is activated with a time delay so that it is only activated when the Hollow piston 33 in the open state is activated and thus only realized the closing process. Through one Sensor 51 can ensure that the user Energy source not unnecessarily burdened after completing one Stroke.

Die hier gezeigte Ausführungsvariante zeigt ein akkubetriebenes Gerät. Die enormen Vorteile, nämlich die kurze Betriebsdauer pro Arbeitshub, die äusserst preiswerte Herstellbarkeit und die durch die kompakte Anordnung erzielbare Gewichtseinsparung sind selbstverständlich auch bei netzabhängigen Presswerkzeugen erwünscht. Die Erfindung bezieht sich daher auch auf netzabhängige Presswerkzeuge.The variant shown here shows a battery powered device. The enormous advantages, namely the short operating time per working stroke, which is extremely inexpensive Manufacturability and the compact arrangement Obtainable weight savings are of course also desirable for network-dependent pressing tools. The invention therefore also refers to network-dependent pressing tools.

Claims (9)

Tragbares, hydraulisch arbeitendes Presswerkzeug (0) für die Verpressung von Kupplungselementen mit einer gabelförmigen Aufnahme (3) und einer in dieser Aufnahme gehaltenen Klemmzange (4), die mittels einer Kolbenzylindereinheit (20) mit integrierter Rückstellfeder (25) betätigbar ist, und dass der auf die Kolbenzylindereinheit anliegende Druck von einer hydraulischen Pumpe (18), die von einem Elektromotor (10) angetrieben wird, erzeugt wird, wobei die Pumpe in einem Hydraulikblock angeordnet ist, der zwischen dem antriebsseitigen Getriebe (13) und der Kolbenzylindereinheit (20) angeordnet ist,
dadurch gekennzeichnet, dass die Pumpe eine Zahnradpumpe (18) ist, deren Rotorwellen (19) auf der einen Seite in einem Lagergehäuse (15) der Getriebeabtriebswelle (16) und auf der anderen Seite im Gehäuse (21) der Kolbenzylindereinheit (20) lagern und dass sämtliche hydraulische Druckleitungen als Bohrungen im Hydraulikblock (17) realisiert sind, in dem auch die Rotorwelle (19) der Zahnradpumpe (18) und eine Ventileinheit (31) angeordnet sind. Portable, hydraulically operating pressing tool (0) for pressing coupling elements with a fork-shaped receptacle (3) and a clamping pliers (4) held in this receptacle, which can be actuated by means of a piston-cylinder unit (20) with an integrated return spring (25), and that pressure applied to the piston-cylinder unit is generated by a hydraulic pump (18) which is driven by an electric motor (10), the pump being arranged in a hydraulic block which is arranged between the drive-side transmission (13) and the piston-cylinder unit (20) is
characterized in that the pump is a gear pump (18), the rotor shafts (19) of which on one side are mounted in a bearing housing (15) of the transmission output shaft (16) and on the other side in the housing (21) of the piston-cylinder unit (20) and that all hydraulic pressure lines are realized as bores in the hydraulic block (17), in which the rotor shaft (19) of the gear pump (18) and a valve unit (31) are also arranged. Presswerkzeug nach Anspruch 1, dadurch gekennzeichnet, dass im Hydraulikblock (17) eine Bohrung angeordnet ist, in der ein Mündungszapfen (27) befestigt ist, der ein volumenveränderbares Reservoir (28) fest hält.Press tool according to claim 1, characterized in that a bore is arranged in the hydraulic block (17) in which a mouth pin (27) is fastened, which holds a volume-variable reservoir (28) firmly. Presswerkzeug nach Anspruch 2, dadurch gekennzeichnet, dass die Ventileinheit (31) im Hydraulikblock (17) zwischen der Zahnradpumpe (18) und dem Mündungszapfen (27) angeordnet ist.Press tool according to claim 2, characterized in that the valve unit (31) is arranged in the hydraulic block (17) between the gear pump (18) and the orifice pin (27). Presswerkzeug nach Anspruch 1, dadurch gekennzeichnet, dass die Ventileinheit (31) zwei hintereinander geschaltete Ventile (32,38) umfasst, wobei das vorlaufseitige erste Ventil (32) einen federbelasteten (36) Hohlkolben (33) als Ventilkörper umfasst, der in einem Zylinder (33') druckabhängig verschiebbar ist, und dass das nachfolgende, zweite Ventil (38) ein Kugelventil ist, wobei die Kugel (41) auf einer Durchgangsbohrung (40) durch eine Ventilplatte (37) zwischen dem ersten (32) und zweiten Ventil (38) federdruckbelastet aufliegt, so dass der Hohlkolben (33) Oeffnungen (35) des Druckstranges öffnet und schliesst und das Kugelventil (38) den Rücklauf (39) durch die Ventilplatte (37) öffnet und schliesst. Press tool according to claim 1, characterized in that the valve unit (31) comprises two valves (32, 38) connected in series, the first valve (32) on the flow side comprising a spring-loaded (36) hollow piston (33) as valve body, which is in a cylinder (33 ') can be displaced as a function of pressure, and that the subsequent second valve (38) is a ball valve, the ball (41) on a through bore (40) through a valve plate (37) between the first (32) and second valve ( 38) rests under spring pressure so that the hollow piston (33) opens and closes openings (35) of the pressure train and the ball valve (38) opens and closes the return (39) through the valve plate (37). Presswerkzeug nach Anspruch 4, dadurch gekennzeichnet, dass das Kugelventil (38) einen Ventilkörper (42) mit einem Fuss (43) mit Kippkante (44) umfasst, wobei die Ventilkugel (41) in einer Aufnahme (41') im Fuss lagert, während über einen Kopf (49) des Ventilkörpers (42) manuell verschiebbare Drucktaste (48) angeordnet ist, mittels der der Kopf (49) des Ventilkörpers zur Seite verschiebbar ist, so dass der Ventilkörper (42) aus der axialen Richtung verschwenkt und über die Kippkante (44) des Fusses (43) eine Kippbewegung ausübt, wodurch das Kugelventil (38) öffnet.Press tool according to claim 4, characterized in that the ball valve (38) comprises a valve body (42) with a foot (43) with a tipping edge (44), the valve ball (41) being supported in a receptacle (41 ') in the foot while A push button (48) which can be moved manually is arranged over a head (49) of the valve body (42), by means of which the head (49) of the valve body can be moved to the side, so that the valve body (42) pivots out of the axial direction and over the tilting edge (44) of the foot (43) exerts a tilting movement, whereby the ball valve (38) opens. Presswerkzeug nach Anspruch 1, dadurch gekennzeichnet, dass der Elektromotor (10) von einem im Werkzeug angeordneten Akku (6) gespiesen ist.Press tool according to claim 1, characterized in that the electric motor (10) is fed by a battery (6) arranged in the tool. Presswerkzeug nach Anspruch 6, dadurch gekennzeichnet, dass die Rückstellbewegung des Hohlkolbens (33) mittels einem Sensor (51) überwachbar ist und den akkugespiesenen Elektromotor (10) abschaltet.Press tool according to claim 6, characterized in that the return movement of the hollow piston (33) can be monitored by means of a sensor (51) and switches off the battery-powered electric motor (10). Presswerkzeug nach Anspruch 5, dadurch gekennzeichnet, dass die Drucktaste an der Innenseite eine exzentrische Kippfläche (50) aufweist, auf die der Kopf (49) bei der Betätigung der Drucktaste (48) zum Aufliegen kommt und aus dem Zentrum zur Seite in eine Kippbewegung versetzbar ist. Press tool according to claim 5, characterized in that the push button on the inside has an eccentric tilting surface (50) on which the head (49) comes to rest when the push button (48) is actuated and can be set into a tilting movement from the center to the side is. Presswerkzeug nach Anspruch 2, dadurch gekennzeichnet, dass das volumenveränderbare Reservoir (28) ein Gummibalg ist.Press tool according to claim 2, characterized in that the volume-variable reservoir (28) is a rubber bellows.
EP01810398A 2000-05-25 2001-04-24 Press tool for crimping connection elements Expired - Lifetime EP1157786B1 (en)

Applications Claiming Priority (2)

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CH10522000 2000-05-25
CH105200 2000-05-25

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EP1157786A3 EP1157786A3 (en) 2002-01-16
EP1157786B1 EP1157786B1 (en) 2006-12-13

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US (1) US6510723B2 (en)
EP (1) EP1157786B1 (en)
AT (1) ATE347973T1 (en)
DE (1) DE50111613D1 (en)
ES (1) ES2277907T3 (en)

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EP2189247A3 (en) * 2008-11-24 2011-04-20 Novopress GmbH Pressen und Presswerkzeuge & Co. KG Drive device for a press device and press device with such a drive device
DE202009003196U1 (en) 2009-03-10 2010-04-29 Novopress Gmbh Pressen Und Presswerkzeuge & Co. Kommanditgesellschaft Handleable drive device for a pressing device
DE202009003197U1 (en) 2009-03-10 2010-05-06 Novopress Gmbh Pressen Und Presswerkzeuge & Co. Kommanditgesellschaft Handleable drive device for a pressing device
EP2228177A1 (en) 2009-03-10 2010-09-15 Novopress GmbH Pressen und Presswerkzeuge & Co. KG Handheld drive device for a press device and method for controlling a handheld drive device for a press device
DE102022201368A1 (en) 2022-02-10 2023-08-10 Robert Bosch Gesellschaft mit beschränkter Haftung Pump device with clutch for drive device
EP4321301A1 (en) * 2022-08-08 2024-02-14 HYTORC Drehmomentmaschinen Seis GmbH Torque tool operated with battery-powered hydraulics

Also Published As

Publication number Publication date
EP1157786B1 (en) 2006-12-13
US6510723B2 (en) 2003-01-28
ATE347973T1 (en) 2007-01-15
DE50111613D1 (en) 2007-01-25
US20020007658A1 (en) 2002-01-24
EP1157786A3 (en) 2002-01-16
ES2277907T3 (en) 2007-08-01

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