EP1157786B1 - Press tool for crimping connection elements - Google Patents

Press tool for crimping connection elements Download PDF

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Publication number
EP1157786B1
EP1157786B1 EP01810398A EP01810398A EP1157786B1 EP 1157786 B1 EP1157786 B1 EP 1157786B1 EP 01810398 A EP01810398 A EP 01810398A EP 01810398 A EP01810398 A EP 01810398A EP 1157786 B1 EP1157786 B1 EP 1157786B1
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EP
European Patent Office
Prior art keywords
valve
pressing tool
piston
tool according
hydraulic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP01810398A
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German (de)
French (fr)
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EP1157786A3 (en
EP1157786A2 (en
Inventor
René Amherd
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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, hydraulically operated pressing tool for the compression of coupling elements, with a fork-shaped receptacle and held in this recording clamping pliers which can be actuated by means of a piston-cylinder unit with integrated return spring having the features of the preamble of claim 1.
  • Portable, hydraulically operated pressing tools of the type mentioned are used for pressing of coupling elements, such as press sleeves, press fittings, pipe sleeves, telescoped pipe sections and the like.
  • the pressing tools have a clamping pliers with clamping jaws, which form a pressing space for receiving the coupling element to be pressed.
  • the pressing pressure necessary for the compression is supplied by a, generally hydraulic, drive.
  • the devices of interest here are preferably used on construction sites, they are usually electrically operated devices.
  • electrically operated press tool devices as they are known for example from EP-A-0'712'696 (Pamag AG).
  • Most of these devices are powered via the network.
  • the availability of electrical connections on construction sites is low. Therefore, it is desirable to be able to work off-grid by the device is operated by means of a battery.
  • the performance of battery-powered devices is highly dependent on energy economics so that reasonable battery life per battery charge can be achieved.
  • the hydraulic pump which is realized here as a piston pump, acts on a piston-cylinder unit with integrated return spring, wherein the pump is arranged completely in a hydraulic block, which is arranged between the drive-side gear and a piston-cylinder unit.
  • the solution according to the invention is realized by the use of a gear pump. Since a gear pump with sufficient power requires a lot of space, is their Arrangement in the device of crucial importance in order to achieve the said solution can, without significantly enlarging the device, which makes it unmanageable by the extra weight alone.
  • the invention achieves this by using, on the one hand, a modular construction in which the gear pump is arranged on the one hand in the hydraulic block, but on the other hand, it is supported on both sides of the hydraulic block in the two adjacent modules. This also results in an extremely compact arrangement with correspondingly short hydraulic lines and leads accordingly to a, despite built-in batteries, relatively light pressing tool.
  • the pressing tool 0 is an electro-hydraulic device, which is realized here as a battery-powered device.
  • the pressing tool 0 has a press tool unit 2 on which a handle 1 is formed.
  • a battery housing 6 is formed as a removable part.
  • a fork-shaped receptacle 3 can be seen.
  • the clamping pliers 4 is held. This is held secured by a locking pin 5 in the receptacle 3.
  • a trigger switch 8 is available for the operation of the device.
  • the actual structure of the press tool function unit 2 can be seen in FIG.
  • the electric motor 10 which is powered by the battery power supply 7. Between the electric motor 10 and the battery 7, the trigger switch 8 is arranged.
  • the electric motor 10 has an output shaft 11 with an end Abreteritzel 12.
  • This Abreteritzel 12 meshes with a transmission gear 13, which is mounted on a transmission output shaft 16.
  • the transmission output shaft 16 is supported on the one hand in a transmission bearing 14 and on the other hand in a transmission housing 15, which passes through the transmission output shaft 16 sealingly.
  • the transmission output shaft 16 forms one of the two rotor shafts 19 of a gear pump 18 (see Figure 3).
  • the lower rotor shaft 19 is also mounted in the transmission housing 15. The abutment of both rotor shafts 19 are held in the cylinder housing 21 of the piston-cylinder unit 20 in corresponding plain bearings.
  • a muzzle pin 27 is mounted at the bottom, communicating on the one hand with a variable volume reservoir 28 in connection and on the other hand via corresponding supply bores in the hydraulic block via a valve unit 31 to the gear pump 18 is connected.
  • a flow line 29 and a pressure line 30 are also realized as bores, via which the mentioned orifice pin 27 with the gear pump 18 on the one hand and on the other hand, the gear pump 18 communicates with the piston-cylinder unit 20 in communicating connection.
  • a piston chamber return 26 is provided, can be recycled via the displaced during the load stroke hydraulic oil via the muzzle pin 27 in the variable volume reservoir 28 or in the provision the piston according to hydraulic oil can be returned to the piston chamber.
  • the piston-cylinder unit 20 with the cylinder housing 21 is designed conventionally, with the exception of the integrated plain bearings for the rotor shafts of the gear pump.
  • the piston 20 on which a return spring 25 acts.
  • the piston 22 displaces via the piston rod 23 a roller bearing 24 for actuating the clamping tongs 4.
  • valve unit 31 has two housing parts which can be screwed together, the one housing part receiving the first, flow switching valve 32, while the second, larger housing part accommodates a ball valve 38 as a second valve.
  • the first valve 32 is separated from the second valve 38 by a valve plate 37.
  • a hollow piston 33 is mounted axially displaceable.
  • the path of the hollow piston 33 is limited on the input side by a securing ring 52 and on the other side by the valve plate 37.
  • the hollow piston 33 is completely open on the side directed toward the valve plate 37, while a relatively small relief bore 34 is arranged in the closed piston head end.
  • the housing part 33 'thus forms the cylinder of the valve, in which the hollow piston 33 is mounted axially movable.
  • a return spring 36 which rests on the one hand inside the piston head and on the other hand is supported on the valve plate 37.
  • the applied oil pressure D shifts the hollow piston 33 against the force of the return compression spring 36 until the hollow piston 33 releases the lateral flow openings 35 to the pressure line.
  • Via the pressure line 30 the hydraulic oil enters the piston-cylinder unit 20 and shifts the piston 22, which moves the roller bearing 24 with its piston rod 23, which leads to the operation of the clamping tongs 4.
  • the second valve 38 is, as already mentioned, a ball valve. This is on the one hand via the return bore 39 in communication with the pressure line and on the other hand via the through hole 40 through the valve plate 37 in communication with the cylinder 33 'of the first valve. However, this connection is opened or closed by the valve ball 41 depending on the pressure.
  • 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 integrally connected to the valve body 42 and in the center of a ball seat 53 is inserted, in which the valve ball 41 partially stored.
  • the valve plate 37 forms the valve seat for the valve ball 41.
  • a spring abutment 45 is screwed in the shape of a ring.
  • a compression spring 46 is arranged between the spring counter bearing 45 and the valve body 43.
  • the characteristic of this compression spring 46 determines the switching pressure. If the switching pressure is reached, the valve ball 41 is raised, a counter-pressure is created on the hollow piston 33, and the hollow piston 33 is displaced back to the securing ring 52 with the aid of the return pressure spring 36, the flow openings 35 being closed become. This is independent of whether the gear pump 18 still promotes or not.
  • a push button 48 If it comes from here not further discussed reasons for blocking or incomplete Hubausaims, it can be reduced by manual operation of a push button 48, the pressure.
  • the push button 48 is held by a return spring 47 in the starting position.
  • a tilting surface 50 By pressing the pushbutton 48, a rounded head 49 of the valve body 42 comes to lie in an eccentric bore, which is referred to as a tilting surface 50.
  • the head 49 is thereby pivoted to the side, wherein the entire valve body 42 participates this pivoting movement.
  • the valve body foot 43 comes with a tilting edge 44 on the valve plate 37 on one side to concern and pivots about the contact point.
  • the valve body foot 43 lifts slightly in the middle, whereby the valve ball 41 is depressurized.
  • the pressure can now dissipate through the through hole 40 in the valve plate 37 and the first valve 32 closes again.
  • the hollow piston 33 When closing the first valve 32, the hollow piston 33 jerks back. For the user, the beating of the valve is audible. As soon as he hears the closing of the valve, he will consequently release the trigger switch 8. But it is quite possible in the cylinder 33 'of the first valve 32 in lower region to arrange a sensor 51 which acts on the trigger switch 8, or the feed line from the battery 7 to the electric motor 10 interrupts. This sensor is activated with a time delay, so that it is activated only when the hollow piston 33 is in the opening state and thus only realizes the closing process. By means of such a sensor 51 it can be ensured that the user does not unnecessarily load the energy source after completion of a lifting movement.
  • the embodiment shown here shows a battery-powered device.
  • the enormous advantages, namely the short operating time per stroke, the extremely inexpensive manufacturability and the achievable by the compact arrangement weight saving are of course also desirable in network-dependent pressing tools.
  • the invention therefore also relates 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)
  • Mounting, Exchange, And Manufacturing Of Dies (AREA)
  • Reciprocating Pumps (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, hydraulically operated pressing tool for the compression of coupling elements, with a fork-shaped receptacle and held in this recording clamping pliers which can be actuated by means of a piston-cylinder unit with integrated return spring having 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, hydraulically operated pressing tools of the type mentioned are used for pressing of coupling elements, such as press sleeves, press fittings, pipe sleeves, telescoped pipe sections and the like. The pressing tools have a clamping pliers with clamping jaws, which form a pressing space for receiving the coupling element to be pressed. The pressing pressure necessary for the compression is supplied by a, generally hydraulic, drive.

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 are preferably used on construction sites, they are usually electrically operated devices. However, for example, reference is made to US-A-5,040,400, in which a pneumatically operated device is shown. However, much more common are electrically operated press tool devices, as they are known for example from EP-A-0'712'696 (Pamag AG). Most of these devices are powered via the network. In many cases, however, the availability of electrical connections on construction sites is low. Therefore, it is desirable to be able to work off-grid by the device is operated by means of a battery. As is well known, however, the performance of battery-powered devices is highly dependent on energy economics so that reasonable battery life per battery charge can be achieved.

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 hitherto available on the market hydraulically operated pressing tools, irrespective of the type of electrical supply rotary pumps or piston pumps are used. All previously known systems have a relatively low flow rate and accordingly the operating time per stroke of the piston-cylinder unit to be actuated is relatively long. While this is insignificant for network-dependent devices, this operating time is crucial for battery-operated devices.

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 a mains powered device of the type described above is known, which otherwise has the features of the preamble of claim 1. The hydraulic pump, which is realized here as a piston pump, acts on a piston-cylinder unit with integrated return spring, wherein the pump is arranged completely in a hydraulic block, which is arranged between the drive-side gear and a piston-cylinder unit.

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 design a portable, hydraulically operating pressing tool according to the preamble of claim 1 so that the operating time per pressing operation to be performed is as short as possible and thus the operating time per charge of the batteries in battery-powered devices for as many pressing operations. It is also the object of the invention to provide a compact as possible, correspondingly lightweight and inexpensive to produce 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 object is achieved by a portable, hydraulically operating pressing tool having the features of patent claim 1. The solution according to the invention is realized by the use of a gear pump. Since a gear pump with sufficient power requires a lot of space, is their Arrangement in the device of crucial importance in order to achieve the said solution can, without significantly enlarging the device, which makes it unmanageable by the extra weight alone. The invention achieves this by using, on the one hand, a modular construction in which the gear pump is arranged on the one hand in the hydraulic block, but on the other hand, it is supported on both sides of the hydraulic block in the two adjacent modules. This also results in an extremely compact arrangement with correspondingly short hydraulic lines and leads accordingly to a, despite built-in batteries, relatively 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 inventive advantageous embodiments of the hydraulically operating pressing tool will become apparent from the dependent claims and the meaning is explained in the following description with reference to the drawings. It shows:
FIG. 1
the inventive pressing tool in the overall view in perspective view.
FIG. 2
the functional unit of the pressing tool in a vertical longitudinal section and
FIG. 3
in a vertical cross section in a simplified representation.
FIG. 4
shows simplified 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 realized here as a battery-powered device. The pressing tool 0 has a press tool unit 2 on which a handle 1 is formed. In the rearward extension of the functional unit 2, a battery housing 6 is formed as a removable part. In the front extension of the press tool unit 2, a fork-shaped receptacle 3 can be seen. In the fork-shaped receptacle 3, the clamping pliers 4 is held. This is held secured by a locking pin 5 in the receptacle 3. As usual, a trigger switch 8 is available for the operation of the device.

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 function unit 2 can be seen in FIG. For the drive provides an electric motor 10, which is powered by the battery power supply 7. Between the electric motor 10 and the battery 7, the trigger switch 8 is arranged. The electric motor 10 has an output shaft 11 with an end Abtriebritzel 12. This Abtriebritzel 12 meshes with a transmission gear 13, which is mounted on a transmission output shaft 16. The transmission output shaft 16 is supported on the one hand in a transmission bearing 14 and on the other hand in a transmission housing 15, which passes through the transmission output shaft 16 sealingly. In the Continuing the transmission output shaft 16 forms 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 mounted in the transmission housing 15. The abutment of both rotor shafts 19 are held in the cylinder housing 21 of the piston-cylinder unit 20 in corresponding plain bearings.

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 already mentioned hydraulic block 17 is thus completely penetrated by the two rotors or rotor shafts 19 of the gear pump 18. In the same hydraulic block 17, a muzzle pin 27 is mounted at the bottom, communicating on the one hand with a variable volume reservoir 28 in connection and on the other hand via corresponding supply bores in the hydraulic block via a valve unit 31 to the gear pump 18 is connected. In the hydraulic block, a flow line 29 and a pressure line 30 are also realized as bores, via which the mentioned orifice pin 27 with the gear pump 18 on the one hand and on the other hand, the gear pump 18 communicates with the piston-cylinder unit 20 in communicating connection. Outside the hydraulic block 17, only a piston chamber return 26 is provided, can be recycled via the displaced during the load stroke hydraulic oil via the muzzle pin 27 in the variable volume reservoir 28 or in the provision the piston according to hydraulic oil can be returned to the piston chamber.

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 according to the invention and the use of a gear pump 18, on the one hand a particularly simple design solution is offered and on the other hand, thanks to the relatively large gear pump that can be realized, a large output is achieved, which correspondingly effects a short operating time per stroke. The inventive arrangement and use of the gear pump also allows extremely simple and short delivery paths of the hydraulic oil, which on the one hand the sealing problems are minimized and on the other hand to realize the lines that are made as holes with relatively large cross-section. As a result, flow losses are minimized.

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 designed conventionally, with the exception of the integrated plain bearings for the rotor shafts of the gear pump. In the cylinder housing 21, the piston 20, on which a return spring 25 acts. The piston 22 displaces via the piston rod 23 a 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 inventive solution is that not a large number of valves is required, which lead to significant flow losses, but that a single valve unit 31 is sufficient for this purpose. This valve unit allows large passages in the forward direction, whereby the mentioned losses are kept very low. With regard to the construction of the valve unit 31, reference is made to FIG. 4, in which the same is shown in simplified form. The valve unit 31 has two housing parts which can be screwed together, the one housing part receiving the first, flow switching valve 32, while the second, larger housing part accommodates a ball valve 38 as a second valve. The first valve 32 is separated from the second valve 38 by a valve plate 37. In the housing of the first, flow switching valve 32, a hollow piston 33 is mounted axially displaceable. The path of the hollow piston 33 is limited on the input side by a securing ring 52 and on the other side by the valve plate 37. The hollow piston 33 is completely open on the side directed toward the valve plate 37, while a relatively small relief bore 34 is arranged in the closed piston head end. The housing part 33 'thus forms the cylinder of the valve, in which the hollow piston 33 is mounted axially movable. In the hollow piston 33 engages a return spring 36, which rests on the one hand inside the piston head and on the other hand is supported on the valve plate 37. The applied oil pressure D shifts the hollow piston 33 against the force of the return compression spring 36 until the hollow piston 33 releases the lateral flow openings 35 to the pressure line. Via the pressure line 30, the hydraulic oil enters the piston-cylinder unit 20 and shifts the piston 22, which moves the roller bearing 24 with its piston rod 23, which leads to the operation of the clamping tongs 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.The second valve 38 is, as already mentioned, a ball valve. This is on the one hand via the return bore 39 in communication with the pressure line and on the other hand via the through hole 40 through the valve plate 37 in communication with the cylinder 33 'of the first valve. However, this connection is opened or closed by the valve ball 41 depending on the pressure. 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 integrally connected to the valve body 42 and in the center of a ball seat 53 is inserted, in which the valve ball 41 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 abutment 45 is screwed in the shape of a ring. Between the spring counter bearing 45 and the valve body 43, a compression spring 46 is arranged. The characteristic of this compression spring 46 determines the switching pressure. If the switching pressure is reached, the valve ball 41 is raised, a counter-pressure is created on the hollow piston 33, and the hollow piston 33 is displaced back to the securing ring 52 with the aid of the return pressure spring 36, the flow openings 35 being closed become. This is independent of whether the gear pump 18 still promotes 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.If it comes from here not further discussed reasons for blocking or incomplete Hubauslösung, it can be reduced by manual operation of a push button 48, the pressure. The push button 48 is held by a return spring 47 in the starting position. By pressing the pushbutton 48, a rounded head 49 of the valve body 42 comes to lie in an eccentric bore, which is referred to as a tilting surface 50. The head 49 is thereby pivoted to the side, wherein the entire valve body 42 participates this pivoting movement. In this case, the valve body foot 43 comes with a tilting edge 44 on the valve plate 37 on one side to concern and pivots about the contact point. As a result, the valve body foot 43 lifts slightly in the middle, whereby the valve ball 41 is depressurized. The pressure can now dissipate 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 closing the first valve 32, the hollow piston 33 jerks back. For the user, the beating of the valve is audible. As soon as he hears the closing of the valve, he will consequently release the trigger switch 8. But it is quite possible in the cylinder 33 'of the first valve 32 in lower region to arrange a sensor 51 which acts on the trigger switch 8, or the feed line from the battery 7 to the electric motor 10 interrupts. This sensor is activated with a time delay, so that it is activated only when the hollow piston 33 is in the opening state and thus only realizes the closing process. By means of such a sensor 51 it can be ensured that the user does not unnecessarily load the energy source after completion of a lifting movement.

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 embodiment shown here shows a battery-powered device. The enormous advantages, namely the short operating time per stroke, the extremely inexpensive manufacturability and the achievable by the compact arrangement weight saving are of course also desirable in network-dependent pressing tools. The invention therefore also relates to network-dependent pressing tools.

Claims (10)

  1. A portable, hydraulically functioning pressing tool (0) for pressing coupling elements with a fork-like receiver (3) and with a clamping pincer (4) which is held in this receiver and which is activatable by way of a piston cylinder unit (20) with an integrated restoring spring (25), wherein the pressure bearing on the piston cylinder unit is produced by a hydraulic pump (18) which is driven by an electric motor (10), and wherein the pump is arranged in a hydraulic block which is arranged between the drive-side gear (13) and the piston cylinder unit (20),
    characterised in that the pump is a gear pump (18) whose rotor shafts (19) are mounted on the one side in a bearing housing (15) of the gear output shaft (16) and on the other side in the housing (21) of the piston cylinder unit (20).
  2. A pressing tool according to claim 1, characterised in that all hydraulic pressure conduits are realized as bores in the hydraulic block (17) in which also the rotor shaft (19) of the gear pump (18) and a valve unit (31) are arranged.
  3. A pressing tool according to claim 1, characterised in that in the hydraulic block (17) there is arranged a bore in which an outlet peg (27) is fastened which firmly holds a reservoir (28) changeable in volume.
  4. A pressing tool according to claim 3, characterised in that the valve unit (31) in the hydraulic block (17) is arranged between the gear pump (18) and the outlet peg (27).
  5. A pressing tool according to claim 1, characterised in that the valve unit (31) comprises two valves (32, 38) connected behind one another, wherein the lead-side first valve (32) comprises a spring-loaded (36) hollow piston (33) as a valve body which is pressure-dependently displaceable in a cylinder (33'), and that the subsequent, second valve (38) is a ball valve, wherein the ball (41) bears on a passage bore (40) through a valve plate (37) between the first (32) and the second valve (37) in a spring-pressure-loaded manner so that the hollow piston (33) opens and closes openings (35) of the pressure line, and the ball valve (38) opens and closes the return travel (39) through the valve plate (37).
  6. A pressing tool according to claim 5, characterised in that the ball valve (38) comprises a valve body (42) with a foot (43) with a tilt edge (44), wherein the valve ball (41) is mounted in a receiver (41') in the foot, whilst over a head (49) of the valve body (42) there is arranged a manually displaceable push button (48) by way of which the head (49) of the valve body is displaceable to the side, so that the valve body (42) pivots from the axial direction and via the tilt edge (44) of the foot (43) exerts a pivot movement by which means the ball valve (38) opens.
  7. A pressing tool according to claim 1, characterised in that the electric motor (10) is fed by a battery (6) arranged in the tool.
  8. A pressing tool according to claim 7, characterised in that the restoring movement of the hollow piston (33) may be monitored by way of a sensor (51) and switches off the battery-fed electric motor (10).
  9. A pressing tool according to claim 6, characterised in that the push button on the inner side comprises an eccentric tilt surface (50) onto which the head (49) comes to bear on actuation of the push button (48) and is displaceable from the centre to the side in a tilting movement.
  10. A pressing tool according to claim 3, characterised in that the volume-changeable 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)

Application Number Priority Date Filing Date Title
CH105200 2000-05-25
CH10522000 2000-05-25

Publications (3)

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EP1157786A2 EP1157786A2 (en) 2001-11-28
EP1157786A3 EP1157786A3 (en) 2002-01-16
EP1157786B1 true EP1157786B1 (en) 2006-12-13

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ID=4554891

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EP01810398A Expired - Lifetime EP1157786B1 (en) 2000-05-25 2001-04-24 Press tool for crimping connection elements

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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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Publication number Publication date
DE50111613D1 (en) 2007-01-25
US20020007658A1 (en) 2002-01-24
US6510723B2 (en) 2003-01-28
EP1157786A3 (en) 2002-01-16
ATE347973T1 (en) 2007-01-15
EP1157786A2 (en) 2001-11-28
ES2277907T3 (en) 2007-08-01

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