EP4126465A1 - Electric handheld power tool - Google Patents

Electric handheld power tool

Info

Publication number
EP4126465A1
EP4126465A1 EP21713691.0A EP21713691A EP4126465A1 EP 4126465 A1 EP4126465 A1 EP 4126465A1 EP 21713691 A EP21713691 A EP 21713691A EP 4126465 A1 EP4126465 A1 EP 4126465A1
Authority
EP
European Patent Office
Prior art keywords
guide tube
main shell
shell
machine tool
cover shell
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.)
Pending
Application number
EP21713691.0A
Other languages
German (de)
French (fr)
Inventor
Ernst-Rudolf Lübkert
Karin Groth
Uto Plank
Manuel Rosenzweig
Andres Wellmann Jelic
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.)
Hilti AG
Original Assignee
Hilti AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hilti AG filed Critical Hilti AG
Publication of EP4126465A1 publication Critical patent/EP4126465A1/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D11/00—Portable percussive tools with electromotor or other motor drive
    • B25D11/06—Means for driving the impulse member
    • B25D11/12—Means for driving the impulse member comprising a crank mechanism
    • B25D11/125—Means for driving the impulse member comprising a crank mechanism with a fluid cushion between the crank drive and the striking body
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D17/06—Hammer pistons; Anvils ; Guide-sleeves for pistons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2217/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D2217/0011—Details of anvils, guide-sleeves or pistons
    • B25D2217/0019—Guide-sleeves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/065—Details regarding assembling of the tool
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/121—Housing details
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/231—Sleeve details
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/361—Use of screws or threaded connections

Definitions

  • the present invention relates to an electric handheld power tool, in particular a hammer drill and / or chisel hammer, with an electropneumatic hammer mechanism, which has a gear housing, a guide tube arranged at least in sections in the gear housing, an exciter piston movable in the axial direction in the guide tube, and an exciter piston coupled to the exciter piston Has connecting rods and an eccentric wheel.
  • the eccentric wheel is coupled on the one hand to the connecting rod and on the other hand is mounted rotatably with respect to the gear housing via a bearing plate of the gear housing.
  • Hand machine tools of the type mentioned are basically known from the prior art.
  • the object of the present invention is to provide a hand-held power tool that is easy to assemble and is preferably designed to be comparatively light.
  • the gear housing is at least divided into a main shell and a cover shell different from the main shell in such a way that the guide tube is braced against the main shell at least in sections by the cover shell.
  • the main shell is made of metal and / or the cover shell is made of plastic.
  • the invention includes the knowledge that in hand power tools of the prior art, the gear housing typically has a fully tubular section into which the guide tube has to be threaded in a complex manner.
  • deep machining - which is typically required in gear housings of the prior art - is particularly costly, since a relatively large machining volume has to be removed in a relatively small bore at a great depth.
  • This material to be removed arises from the requirements of die casting:
  • the core for the long inner diameter must have a certain draft so that it can be removed from the mold. This then typically leads to a certain accumulation of mass, which leads to the formation of shrinkage cavities in the die casting.
  • the cavities mean reduced strength in these areas and are often involved in the propagation of the fracture.
  • the preferred configuration of the cover shell made of plastic enables a significant reduction in weight of the gearbox housing and thus of the entire handheld power tool to be achieved.
  • the invention includes the knowledge that plastic can be provided in exactly the area of the gear housing in which the smallest flow of cooling air is located in the handheld power tool (i.e. in the area in which the lowest heat flow is present during operation), namely above the hammer mechanism.
  • the cover shell extends in the axial direction over the entire length of the guide tube.
  • the striking mechanism area can be easily cleaned and is also comparatively easily accessible for a visual inspection.
  • the main shell and the cover shell are designed to be complementary to one another in the radial direction and at least along the guide tube.
  • the bearing plate is formed in one piece with the main shell.
  • machining in the area of the integrated end shield can be tolerated relatively roughly, as a result of which a machining volume is considerably reduced.
  • the main shell has a concave surface section on which at least one radial rib is formed, which serves to support the guide tube radially and / or axially.
  • the radial rib is integrally formed as a blank and / or is designed without machining.
  • the cover shell has a retaining lip on a side facing the eccentric wheel. It has been found to be advantageous if the course of the retaining lip course follows, at least in sections, preferably completely, a circular path of an eccentric point of the eccentric wheel. It has been found to be advantageous if the eccentric wheel is rotatably mounted in the end shield by means of a bearing journal which is encompassed by the hammer mechanism and which is designed to be non-rotatable with respect to and / or different from the eccentric wheel.
  • the eccentric wheel is designed as an externally toothed gear wheel, which can preferably be rotationally driven by an electric motor comprised by the handheld power tool. It has been found to be advantageous if the cover shell is screwed to the main shell.
  • the main shell can mainly consist of metal.
  • the cover shell can predominantly consist of plastic.
  • FIG. 1 shows a first preferred exemplary embodiment of a striking mechanism of an electric Fland machine tool
  • FIG. 2 shows a second preferred exemplary embodiment of an impact mechanism of an electric flange machine tool in an exploded view.
  • FIG. 1 A first preferred exemplary embodiment of an electropneumatic striking mechanism 70 of an electric handheld power tool 100 (cf. FIG. 2A designed as a chisel hammer, for example) is shown in FIG. 1.
  • the electropneumatic hammer mechanism 70 has a transmission housing 60 and a guide tube 50, the guide tube 50 being arranged at least in sections in the transmission housing 60.
  • the electro-pneumatic hammer mechanism 70 also has an exciter piston 40 which is movable in the axial direction AR in the guide tube 50, a connecting rod 30 coupled to the exciter piston 40, and an eccentric wheel 20.
  • the eccentric wheel 20 is coupled, on the one hand, to the connecting rod 30 and, on the other hand, is mounted rotatably with respect to the gear housing 60 via a bearing plate 10 of the gear housing 60.
  • the eccentric wheel 20 is rotatably mounted in the bearing plate 10 by means of a bearing journal 25 which is encompassed by the hammer mechanism 70 and which is designed to be non-rotatable with respect to and different from the eccentric wheel 20.
  • the eccentric wheel 20 is designed as an externally toothed gear wheel which can be rotationally driven by an electric motor, not shown here.
  • the gear housing 60 is at least divided into a main shell 61 and a cover shell 65 different from the main shell 61 in such a way that the guide tube 50 is braced at least in sections by the cover shell 65 against the main shell 61.
  • the guide tube 50 has at least one annular retaining collar 51 via which the cover shell 65 is braced against the main shell 61, which in turn is also in contact with the retaining collar 51, in the radial direction RR in relation to the guide tube 50.
  • the cover shell 65 is screwed to the main shell 61 (the screws are not shown in FIG. 1).
  • the main shell 61 consists of metal, for example of die-cast aluminum. Since the bearing plate 10 is here advantageously formed in one piece with the main shell 61, it is also made of die-cast aluminum.
  • the cover shell 65 consists of plastic, for example of polybutylene terephthalate (PBT). As a result of the design of the cover shell 65 made of plastic, a significant overall weight reduction of the gear housing 60 is achieved.
  • the cover shell 65 has a retaining lip 67 on a side facing the eccentric wheel 20, the course of which follows, at least in sections, a circular path 23 of an eccentric point 21 of the eccentric wheel 20.
  • the connecting rod 30, the eccentric wheel 20 and the bearing pin 25 are prevented from lifting secured in the radial direction RR (in Fig. 1 upwards).
  • the radial direction RR and the axial direction AR in the context of this description are always related to the guide tube 50, the axial direction AR being oriented coaxially to the direction of movement of the exciter piston 40.
  • a separating cap 71 which is arranged between the main shell 61 and the cover shell 65 and which encompasses at least the eccentric wheel 20 is optionally provided.
  • FIG. 2A A second preferred exemplary embodiment of an electropneumatic hammer mechanism 70 of an electric flange machine tool 100 (cf. FIG. 2A designed as a chisel hammer, for example) is shown - in an exploded view - in FIG. 2B.
  • the essential difference from the exemplary embodiment in FIG. 1 is the omission of the separating cap 71.
  • the cover shell 65 extends in the axial direction AR over the entire length GL of the guide tube 50.
  • the cover shell 65 is made of plastic, for example - a considerable weight saving compared to prior art striking mechanisms is achieved.
  • This also enables the comparatively easy insertion of the guide tube 50 into the main shell 61, as well as facilitating the assembly of the exciter piston 40, connecting rod 30 and eccentric 20, which are also attached from above (ie from the side of the main shell 61 facing away from the end shield 10) by a generous Opening - namely the removed cover shell 65 - can be inserted into the main shell 61.
  • a complicated threading of the connecting rod pin 31 into the eccentric wheel 20 and the subsequent introduction of the exciter piston 40 into the guide tube 50 is significantly facilitated.
  • the main shell 61 and the cover shell 65 are designed to be complementary to one another in the radial direction RR and at least along the guide tube 50.
  • the inner surfaces of the main shell 61 and the cover shell 65 complement each other to form a solid cylinder in which the guide tube 50 is completely accommodated.
  • the plastic bearing cover 65 stiffens the main shell 61 of the gear housing 60 so that the main shell 61 does not lose rigidity due to the screw connections (indicated in FIG. 2B by the screw holes 62).
  • the main shell 61 has a concave surface section 63 on which four radial ribs 64 are formed here, for example, which serve for the radial and axial support of the guide tube 50.
  • the radial rib 64 are advantageously formed as a blank on the main shell 61 and this remains free of machining.

Abstract

The invention relates to an electric handheld power tool, in particular a hammer drill and/or a chisel hammer, comprising an electropneumatic striking mechanism which has a gearing housing, a guide tube which is at least partly arranged in the gearing housing, an exciter piston which can be moved in the guide tube in the axial direction, a connecting rod which is coupled to the exciter piston, and an eccentric gear which is coupled to the connecting rod and is mounted via a bearing shield of the gearing housing in a rotatable manner relative to the gearing housing, wherein the gearing housing is divided at least into a main shell and a cover shell which differs from the main shell such that the guide tube is at least partly pretensioned against the main shell by the cover shell.

Description

Elektrische Handwerkzeugmaschine Electric hand machine tool
Die vorliegende Erfindung betrifft eine elektrische Handwerkzeugmaschine, insbesondere einen Bohr- und/oder Meißelhammer, mit einem elektropneumatischen Schlagwerk, das ein Getriebegehäuse, ein zumindest abschnittsweise in dem Getriebegehäuse angeordnetes Führungsrohr, ein in axialer Richtung in dem Führungsrohr beweglichen Erregerkolben, einen mit dem Erregerkolben gekoppelten Pleuel sowie ein Exzenterrad aufweist. Das Exzenterrad ist einerseits mit dem Pleuel gekoppelt und andererseits über ein Lagerschild des Getriebegehäuses drehbar bezüglich des Getriebegehäuses gelagert. The present invention relates to an electric handheld power tool, in particular a hammer drill and / or chisel hammer, with an electropneumatic hammer mechanism, which has a gear housing, a guide tube arranged at least in sections in the gear housing, an exciter piston movable in the axial direction in the guide tube, and an exciter piston coupled to the exciter piston Has connecting rods and an eccentric wheel. The eccentric wheel is coupled on the one hand to the connecting rod and on the other hand is mounted rotatably with respect to the gear housing via a bearing plate of the gear housing.
Handwerkzeugmaschinen der eingangs genannter Art sind grundsätzlich aus dem Stand der Technik bekannt. Hand machine tools of the type mentioned are basically known from the prior art.
Es ist Aufgabe der vorliegenden Erfindung eine Handwerkzeugmaschine bereitzustellen, die einfach zu montieren und dabei vorzugsweise vergleichsweise leicht ausgebildet ist. The object of the present invention is to provide a hand-held power tool that is easy to assemble and is preferably designed to be comparatively light.
Die Aufgabe wird dadurch gelöst, dass das Getriebegehäuse zumindest in eine Hauptschale und eine von der Hauptschale verschiedene Deckschale derart gegliedert ist, dass das Führungsrohr zumindest abschnittsweise durch die Deckschale gegen die Hauptschale verspannt ist. In einer besonders bevorzugten Ausgestaltung besteht die Hauptschale aus Metall und/oder die besteht die Deckschale aus Kunststoff. The object is achieved in that the gear housing is at least divided into a main shell and a cover shell different from the main shell in such a way that the guide tube is braced against the main shell at least in sections by the cover shell. In a particularly preferred embodiment, the main shell is made of metal and / or the cover shell is made of plastic.
Die Erfindung schließt die Erkenntnis ein, dass bei Handwerkzeugmaschinen des Standes der Technik das Getriebegehäuse typischerweise eine vollrohrförmigen Abschnitt aufweist in den das Führungsrohr aufwändig eingefädelt werden muss. Zudem ist eine tiefe Zerspanung - die bei Getriebegehäuses des Standes der Technik typischerweise erforderlich ist - besonders kostenintensiv, da in einer relativ kleinen Bohrung bei großer Tiefe ein relativ großes Zerspanungsvolumen zu entfernen ist. Dieses zu entfernende Material entsteht aus den Erfordernissen des Druckgießens: Der Kern für den langen Innendurchmesser muss eine gewisse Formschräge aufweisen damit er entformt werden kann. Dies führt dann typischerweise zu einer gewissen Masseanhäufung, die im Druckguss zur Bildung von Schwindungslunkern führt. Die Lunker bedeuten verringerte Festigkeit in diesen Bereichen und sind oft bei der Bruchausbreitung beteiligt. Durch die erfindungsgemäße Gliederung des Getriebegehäuses in eine vorzugsweise aus Metall bestehende Hauptschale und eine vorzugsweise aus Kunststoff bestehende Deckschale wird dieser Nachteil vermieden, da das Getriebegehäuse - bei entfernter Deckschale - quasi „nach oben“ geöffnet ist. Dies ermöglich das vergleichsweise leichte Einlegen des Führungsrohrs in die Hauptschale, sowie eine Erleichtere Montage von Erregerkolben, Pleuel und Exzenter, die ebenfalls „von oben“ durch eine großzügige Öffnung - nämlich die abgenommene Deckschale - in die Hauptschale eingelegt werden können. Insbesondere ein kompliziertes Einfädeln des Exzenterzapfens in den Pleuel (oder ein kompliziertes Einfädeln des Pleuelzapfens in das Exzenterrad) und das anschließende Einführen des Erregerkolbens in das Führungsrohr entfällt. The invention includes the knowledge that in hand power tools of the prior art, the gear housing typically has a fully tubular section into which the guide tube has to be threaded in a complex manner. In addition, deep machining - which is typically required in gear housings of the prior art - is particularly costly, since a relatively large machining volume has to be removed in a relatively small bore at a great depth. This material to be removed arises from the requirements of die casting: The core for the long inner diameter must have a certain draft so that it can be removed from the mold. This then typically leads to a certain accumulation of mass, which leads to the formation of shrinkage cavities in the die casting. The cavities mean reduced strength in these areas and are often involved in the propagation of the fracture. The inventive division of the gear housing into a main shell, preferably made of metal, and a main shell, preferably made of plastic Existing cover shell, this disadvantage is avoided, since the gear housing - when the cover shell is removed - is open “upwards”, so to speak. This enables the comparatively easy insertion of the guide tube into the main shell, as well as easier assembly of the exciter piston, connecting rod and eccentric, which can also be inserted into the main shell "from above" through a large opening - namely the removed cover shell. In particular, a complicated threading of the eccentric pin into the connecting rod (or a complicated threading of the connecting rod pin into the eccentric wheel) and the subsequent insertion of the exciter piston into the guide tube are dispensed with.
Insbesondere durch die bevorzugte Ausgestaltung der Deckschale aus Kunststoff kann eine deutliche Gewichtsreduktion des Getriebegehäuses und somit der gesamten Handwerkzeugmaschine erreicht werden. Die Erfindung schließt diesbezüglich die Erkenntnis ein, dass Kunststoff in genau dem Bereich des Getriebegehäuse vorgesehen werden kann in welchem sich in den Handwerkzeugmaschinen der geringste Kühlluftstrom befindet (das heißt in dem Bereich in welchem im Betrieb der geringste Wärmestrom anliegt) nämlich oberhalb des Schlagwerks. In particular, the preferred configuration of the cover shell made of plastic enables a significant reduction in weight of the gearbox housing and thus of the entire handheld power tool to be achieved. In this regard, the invention includes the knowledge that plastic can be provided in exactly the area of the gear housing in which the smallest flow of cooling air is located in the handheld power tool (i.e. in the area in which the lowest heat flow is present during operation), namely above the hammer mechanism.
Es hat sich als vorteilhaft herausgestellt, wenn sich die Deckschale in axialer Richtung über die gesamte Länge des Führungsrohrs erstreckt. Dadurch kann der Schlagwerksbereich leicht gesäubert werden und ist auch für eine Sichtkontrolle vergleichsweise einfach zugänglich. It has been found to be advantageous if the cover shell extends in the axial direction over the entire length of the guide tube. As a result, the striking mechanism area can be easily cleaned and is also comparatively easily accessible for a visual inspection.
In einer besonders bevorzugten Ausgestaltung sind die Hauptschale und die Deckschale in radialer Richtung und zumindest entlang des Führungsrohrs komplementär zueinander ausgebildet. In a particularly preferred embodiment, the main shell and the cover shell are designed to be complementary to one another in the radial direction and at least along the guide tube.
In einer weiteren bevorzugten Ausgestaltung ist das Lagerschild einstückig mit der Hauptschale ausgebildet. Vorteilhafterweise kann dadurch eine Zerspanung im Bereich des integrierten Lagerschildes können relativ grob toleriert werden, wodurch ein Zerspanungsvolumen erheblich reduziert wird. In a further preferred embodiment, the bearing plate is formed in one piece with the main shell. Advantageously, machining in the area of the integrated end shield can be tolerated relatively roughly, as a result of which a machining volume is considerably reduced.
Es hat sich als vorteilhaft herausgestellt, wenn die Hauptschale einen konkaven Oberflächenabschnitt aufweist an dem wenigstens eine radiale Rippe ausgebildet ist, die der radialen und/oder axialen Lagerung des Führungsrohrs dient. In einer besonders bevorzugten Ausgestaltung ist die radiale Rippe als Rohteil angeformt und/oder zerspanungsfrei ausgebildet.It has been found to be advantageous if the main shell has a concave surface section on which at least one radial rib is formed, which serves to support the guide tube radially and / or axially. In a particularly preferred embodiment, the radial rib is integrally formed as a blank and / or is designed without machining.
In einer weiteren bevorzugten Ausgestaltung weist die Deckschale auf einer dem Exzenterrad zugewandten Seite eine Haltelippe auf. Es hat sich als vorteilhaft herausgestellt, wenn der Verlauf der Haltelippe Verlauf zumindest abschnittsweise, vorzugsweise vollständig einer Kreisbahn eines Exzenterpunktes des Exzenterrades folgt. Es hat sich als vorteilhaft herausgestellt, wenn das Exzenterrad mittels eines vom Schlagwerk umfassten Lagerzapfens, der drehfest zum und/oder verschieden vom Exzenterrad ausgebildet ist, drehbar in dem Lagerschild gelagert ist. In a further preferred embodiment, the cover shell has a retaining lip on a side facing the eccentric wheel. It has been found to be advantageous if the course of the retaining lip course follows, at least in sections, preferably completely, a circular path of an eccentric point of the eccentric wheel. It has been found to be advantageous if the eccentric wheel is rotatably mounted in the end shield by means of a bearing journal which is encompassed by the hammer mechanism and which is designed to be non-rotatable with respect to and / or different from the eccentric wheel.
In einer besonders bevorzugten Ausgestaltung ist das Exzenterrad als außenverzahntes Zahnrad ausgebildet, das vorzugsweise über einen von der Handwerkzeugmaschine umfassten Elektromotor rotatorisch angetrieben werden kann. Es hat sich als vorteilhaft herausgestellt, wenn die Deckschale mit der Hauptschale verschraubt ist. Die Hauptschale kann überwiegend aus Metall bestehen. Die Deckschale kann überwiegend aus Kunststoff bestehen. In a particularly preferred embodiment, the eccentric wheel is designed as an externally toothed gear wheel, which can preferably be rotationally driven by an electric motor comprised by the handheld power tool. It has been found to be advantageous if the cover shell is screwed to the main shell. The main shell can mainly consist of metal. The cover shell can predominantly consist of plastic.
Weitere Vorteile ergeben sich aus der folgenden Figurenbeschreibung. In den Figuren sind verschiedene Ausführungsbeispiele der vorliegenden Erfindung dargestellt. Die Figuren, die Beschreibung und die Ansprüche enthalten zahlreiche Merkmale in Kombination. Der Fachmann wird die Merkmale zweckmäßigerweise auch einzeln betrachten und zu sinnvollen weiteren Kombinationen zusammenfassen. Further advantages emerge from the following description of the figures. Various exemplary embodiments of the present invention are shown in the figures. The figures, the description and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into meaningful further combinations.
In den Figuren sind gleiche und gleichartige Komponenten mit gleichen Bezugszeichen beziffert. Es zeigen: In the figures, the same and similar components are numbered with the same reference numerals. Show it:
Fig. 1 ein erstes bevorzugtes Ausführungsbeispiel eines Schlagwerks einer elektrischen Flandwerkzeugmaschine; und Fig. 2 ein zweites bevorzugtes Ausführungsbeispiel eines Schlagwerks einer elektrischen Flandwerkzeugmaschine in Explosionsdarstellung. 1 shows a first preferred exemplary embodiment of a striking mechanism of an electric Fland machine tool; and FIG. 2 shows a second preferred exemplary embodiment of an impact mechanism of an electric flange machine tool in an exploded view.
Ausführunasbeisoiele: Examples of execution:
Ein erstes bevorzugtes Ausführungsbeispiel eines elektropneumatischen Schlagwerks 70 einer elektrischen Handwerkzeugmaschine 100 (vgl. Fig. 2A beispielhaft als Meißelhammer ausgebildet) ist in Fig. 1 dargestellt. A first preferred exemplary embodiment of an electropneumatic striking mechanism 70 of an electric handheld power tool 100 (cf. FIG. 2A designed as a chisel hammer, for example) is shown in FIG. 1.
Das elektropneumatische Schlagwerk 70 weist ein Getriebegehäuse 60 und ein Führungsrohr 50 auf, wobei das Führungsrohr 50 zumindest abschnittsweise in dem Getriebegehäuse 60 angeordnet ist. Das elektropneumatische Schlagwerk 70 weist weiter ein in axialer Richtung AR in dem Führungsrohr 50 beweglichen Erregerkolben 40, einen mit dem Erregerkolben 40 gekoppelten Pleuel 30 sowie ein Exzenterrad 20 auf. Das Exzenterrad 20 ist einerseits mit dem Pleuel 30 gekoppelt und andererseits über ein Lagerschild 10 des Getriebegehäuses 60 drehbar bezüglich des Getriebegehäuses 60 gelagert. Genauer gesagt ist das Exzenterrad 20 mittels eines vom Schlagwerk 70 umfassten Lagerzapfens 25, der drehfest zum und verschieden vom Exzenterrad 20 ausgebildet ist, drehbar in dem Lagerschild 10 gelagert. Das Exzenterrad 20 ist als außenverzahntes Zahnrad ausgebildet, das über einen hier nicht dargestellten Elektromotor rotatorisch angetrieben werden kann. The electropneumatic hammer mechanism 70 has a transmission housing 60 and a guide tube 50, the guide tube 50 being arranged at least in sections in the transmission housing 60. The electro-pneumatic hammer mechanism 70 also has an exciter piston 40 which is movable in the axial direction AR in the guide tube 50, a connecting rod 30 coupled to the exciter piston 40, and an eccentric wheel 20. The eccentric wheel 20 is coupled, on the one hand, to the connecting rod 30 and, on the other hand, is mounted rotatably with respect to the gear housing 60 via a bearing plate 10 of the gear housing 60. More precisely, the eccentric wheel 20 is rotatably mounted in the bearing plate 10 by means of a bearing journal 25 which is encompassed by the hammer mechanism 70 and which is designed to be non-rotatable with respect to and different from the eccentric wheel 20. The eccentric wheel 20 is designed as an externally toothed gear wheel which can be rotationally driven by an electric motor, not shown here.
Erfindungsgemäß ist das Getriebegehäuse 60 zumindest in eine Hauptschale 61 und eine von der Hauptschale 61 verschiedene Deckschale 65 derart gegliedert, dass das Führungsrohr 50 zumindest abschnittsweise durch die Deckschale 65 gegen die Hauptschale 61 verspannt ist. Genauer gesagt weist das Führungsrohr 50 wenigstens einen ringförmigen Haltekragen 51 auf über den - in radialer Richtung RR bezogen auf das Führungsrohr 50 - die Deckschale 65 gegen die Hauptschale 61 , die ihrerseits ebenfalls mit dem Haltekragen 51 in Kontakt steht, verspannt ist. Die Deckschale 65 ist mit der Hauptschale 61 verschraubt (die Schrauben sind in Fig. 1 nicht dargestellt). According to the invention, the gear housing 60 is at least divided into a main shell 61 and a cover shell 65 different from the main shell 61 in such a way that the guide tube 50 is braced at least in sections by the cover shell 65 against the main shell 61. More precisely, the guide tube 50 has at least one annular retaining collar 51 via which the cover shell 65 is braced against the main shell 61, which in turn is also in contact with the retaining collar 51, in the radial direction RR in relation to the guide tube 50. The cover shell 65 is screwed to the main shell 61 (the screws are not shown in FIG. 1).
Im vorliegend dargestellten Ausführungsbeispiel besteht die Hauptschale 61 aus Metall, beispielhaft aus Aluminiumdruckguss. Da das das Lagerschild 10 hier vorteilhafterweise einstückig mit der Hauptschale 61 ausgebildet ist, besteht dieses ebenfalls aus Aluminiumdruckguss. Die Deckschale 65 besteht aus Kunststoff, beispielhaft aus Polybutylenterephthalat (PBT). Durch die Ausgestaltung der Deckschale 65 aus Kunststoff wird eine deutliche Gewichtsreduktion des Getriebegehäuses 60 insgesamt erreicht. In the exemplary embodiment shown here, the main shell 61 consists of metal, for example of die-cast aluminum. Since the bearing plate 10 is here advantageously formed in one piece with the main shell 61, it is also made of die-cast aluminum. The cover shell 65 consists of plastic, for example of polybutylene terephthalate (PBT). As a result of the design of the cover shell 65 made of plastic, a significant overall weight reduction of the gear housing 60 is achieved.
Wie der Fig. 1 ebenfalls entnommen werden kann, weist die Deckschale 65 auf einer dem Exzenterrad 20 zugewandten Seite eine Haltelippe 67 auf, deren Verlauf zumindest abschnittsweise einer Kreisbahn 23 eines Exzenterpunktes 21 des Exzenterrades 20 folgt. Derart werden der Pleuel 30, das Exzenterrad 20 sowie der Lagerzapfen 25 gegen ein Abheben in radialer Richtung RR (in Fig. 1 nach oben) gesichert. Es sei angemerkt, dass die radiale Richtung RR und die axiale Richtung AR im Rahmen dieser Beschreibung stets auf das Führungsrohr 50 bezogen sind, wobei die axiale Richtung AR koaxial zur Bewegungsrichtung des Erregerkolben 40 orientiert ist. As can also be seen from FIG. 1, the cover shell 65 has a retaining lip 67 on a side facing the eccentric wheel 20, the course of which follows, at least in sections, a circular path 23 of an eccentric point 21 of the eccentric wheel 20. In this way, the connecting rod 30, the eccentric wheel 20 and the bearing pin 25 are prevented from lifting secured in the radial direction RR (in Fig. 1 upwards). It should be noted that the radial direction RR and the axial direction AR in the context of this description are always related to the guide tube 50, the axial direction AR being oriented coaxially to the direction of movement of the exciter piston 40.
Eine zwischen der Flauptschale 61 und der Deckschale 65 angeordnete Trennkappe 71 , die zumindest das Exzenterrad 20 umgreift ist optional vorgesehen. A separating cap 71 which is arranged between the main shell 61 and the cover shell 65 and which encompasses at least the eccentric wheel 20 is optionally provided.
Ein zweites bevorzugtes Ausführungsbeispiel eines elektropneumatischen Schlagwerks 70 einer elektrischen Flandwerkzeugmaschine 100 (vgl. Fig. 2A beispielhaft als Meißelhammer ausgebildet) ist - in Explosionsdarstellung - in Fig. 2B dargestellt. Der wesentliche Unterschied zum Ausführungsbeispiel der Fig. 1 ist der Verzicht auf die Trennkappe 71. A second preferred exemplary embodiment of an electropneumatic hammer mechanism 70 of an electric flange machine tool 100 (cf. FIG. 2A designed as a chisel hammer, for example) is shown - in an exploded view - in FIG. 2B. The essential difference from the exemplary embodiment in FIG. 1 is the omission of the separating cap 71.
Wie der Fig. 2B entnommen werden kann, erstreckt sich die Deckschale 65 in axialer Richtung AR über die gesamte Länge GL des Führungsrohrs 50. Somit wird - die Deckschale 65 besteht beispielhaft aus Kunststoff - bereits eine beträchtliche Gewichtsersparnis zu Schlagwerken des Standes der Technik erreicht. Auch ermöglicht dies das vergleichsweise leichte Einlegen des Führungsrohrs 50 in die Flauptschale 61 , sowie eine Erleichtere Montage von Erregerkolben 40, Pleuel 30 und Exzenter 20, die ebenfalls von oben (d.h. von der dem Lagerschild 10 abgewandten Seite der Flauptschale 61 aus) durch eine großzügige Öffnung - nämlich die abgenommene Deckschale 65 - in die Flauptschale 61 eingelegt werden können. Insbesondere ein kompliziertes Einfädeln des Pleuelzapfens 31 in das Exzenterrad 20 und das anschließende Einführen des Erregerkolbens 40 in das Führungsrohr 50 wird deutlich erleichtert. As can be seen in FIG. 2B, the cover shell 65 extends in the axial direction AR over the entire length GL of the guide tube 50. Thus - the cover shell 65 is made of plastic, for example - a considerable weight saving compared to prior art striking mechanisms is achieved. This also enables the comparatively easy insertion of the guide tube 50 into the main shell 61, as well as facilitating the assembly of the exciter piston 40, connecting rod 30 and eccentric 20, which are also attached from above (ie from the side of the main shell 61 facing away from the end shield 10) by a generous Opening - namely the removed cover shell 65 - can be inserted into the main shell 61. In particular, a complicated threading of the connecting rod pin 31 into the eccentric wheel 20 and the subsequent introduction of the exciter piston 40 into the guide tube 50 is significantly facilitated.
Gut zu erkennen ist, dass die Flauptschale 61 und die Deckschale 65 in radialer Richtung RR und zumindest entlang des Führungsrohrs 50 komplementär zueinander ausgebildet sind. Die inneren Oberflächen der Flauptschale 61 und die Deckschale 65 ergänzen sich zu einem Vollzylinder in dem das Führungsrohr 50 vollständig aufgenommen ist. Insbesondere durch diese komplementäre Ausgestaltung versteift der aus Kunststoff bestehende Lagerdeckel 65 die Flauptschale 61 des Getriebegehäuse 60 so, dass die Flauptschale 61 durch die Verschraubungen (in Fig. 2B angedeutet durch die Schraublöcher 62) nicht an Steifigkeit einbüßt. It can be clearly seen that the main shell 61 and the cover shell 65 are designed to be complementary to one another in the radial direction RR and at least along the guide tube 50. The inner surfaces of the main shell 61 and the cover shell 65 complement each other to form a solid cylinder in which the guide tube 50 is completely accommodated. In particular, through this complementary configuration, the plastic bearing cover 65 stiffens the main shell 61 of the gear housing 60 so that the main shell 61 does not lose rigidity due to the screw connections (indicated in FIG. 2B by the screw holes 62).
Die Flauptschale 61 weist einen konkaven Oberflächenabschnitt 63 auf an dem hier beispielhaft vier radiale Rippen 64 ausgebildet sind, die der radialen und axialen Lagerung des Führungsrohrs 50 dient. Vorteilhafterweise sind die radiale Rippe 64 als Rohteil an die Flauptschale 61 angeformt und verbleiben diese zerspanungsfrei. Bezuaszeichenliste The main shell 61 has a concave surface section 63 on which four radial ribs 64 are formed here, for example, which serve for the radial and axial support of the guide tube 50. The radial rib 64 are advantageously formed as a blank on the main shell 61 and this remains free of machining. Reference list
10 Lagerschild 10 bearing shield
20 Exzenterrad 20 eccentric wheel
21 Exzenterpunkt 21 eccentric point
23 Kreisbahn 23 circular path
25 Lagerzapfen 25 journals
30 Pleuel 30 connecting rods
31 Pleuelzapfens 31 connecting rod pin
40 Erregerkolben 40 exciter pistons
50 Führungsrohr 50 guide tube
51 Haltekragen 51 retaining collar
60 Getriebegehäuse 60 gear housing
61 Hauptschale 61 main shell
62 Schraubloch 62 screw hole
63 konkaver Oberflächenabschnitt63 concave surface section
64 radiale Rippe 64 radial rib
65 Deckschale 65 cover shell
67 Haltelippe 67 retaining lip
70 Schlagwerk 70 striking mechanism
71 Trenn kappe 71 separator cap
100 Elektrische Handwerkzeugmaschine 100 electric hand tool
AR axiale Richtung AR axial direction
GL Gesamtlänge GL total length
RR radiale Richtung RR radial direction

Claims

Patentansprüche Claims
1. Elektrische Handwerkzeugmaschine (100), insbesondere Bohr- und/oder Meißelhammer, mit einem elektropneumatischen Schlagwerk (70), das ein Getriebegehäuse (60), ein zumindest abschnittsweise in dem Getriebegehäuse (60) angeordnetes Führungsrohr (50), ein in axialer Richtung (AR) in dem Führungsrohr (50) beweglichen Erregerkolben (40), einen mit dem Erregerkolben (40) gekoppelten Pleuel (30) sowie ein Exzenterrad (20) aufweist, das einerseits mit dem Pleuel (30) gekoppelt und andererseits über ein Lagerschild (10) des Getriebegehäuses (60) drehbar bezüglich des Getriebegehäuses (60) gelagert ist, dadurch gekennzeichnet, dass das Getriebegehäuse (60) zumindest in eine Hauptschale (61) und eine von der Hauptschale (61) verschiedene Deckschale (65) derart gegliedert ist, dass das Führungsrohr (50) zumindest abschnittsweise durch die Deckschale (65) gegen die Hauptschale (61) verspannt ist. 1. Electric hand tool (100), in particular hammer drill and / or chisel hammer, with an electropneumatic hammer mechanism (70) which has a gear housing (60), a guide tube (50) arranged at least in sections in the gear housing (60), and an axial direction (AR) in the guide tube (50) movable exciter piston (40), a connecting rod (30) coupled to the exciter piston (40) and an eccentric wheel (20) which is coupled on the one hand to the connecting rod (30) and on the other hand via a bearing plate ( 10) of the gear housing (60) is rotatably mounted with respect to the gear housing (60), characterized in that the gear housing (60) is divided into at least a main shell (61) and a cover shell (65) different from the main shell (61) in such a way that that the guide tube (50) is braced at least in sections by the cover shell (65) against the main shell (61).
2. Handwerkzeugmaschine (100) nach Anspruch 1 , dadurch gekennzeichnet, dass sich die Deckschale (65) in axialer Richtung (AR) über die gesamte Länge (GL) des Führungsrohrs (50) erstreckt. 2. Hand machine tool (100) according to claim 1, characterized in that the cover shell (65) extends in the axial direction (AR) over the entire length (GL) of the guide tube (50).
3. Handwerkzeugmaschine (100) nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Hauptschale (61) und die Deckschale (65) in radialer Richtung (RR) und zumindest entlang des Führungsrohrs (50) komplementär zueinander ausgebildet sind. 3. Hand machine tool (100) according to claim 1 or 2, characterized in that the main shell (61) and the cover shell (65) are designed to be complementary to one another in the radial direction (RR) and at least along the guide tube (50).
4. Handwerkzeugmaschine (100) nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die Hauptschale (61) aus Metall besteht und/oder die Deckschale (65) aus Kunststoff besteht. 4. Hand machine tool (100) according to one of the preceding claims, characterized in that the main shell (61) consists of metal and / or the cover shell (65) consists of plastic.
5. Handwerkzeugmaschine (100) nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass das Lagerschild (10) einstückig mit der Hauptschale (61) ausgebildet ist. 5. Hand machine tool (100) according to one of the preceding claims, characterized in that the bearing plate (10) is formed in one piece with the main shell (61).
6. Handwerkzeugmaschine (100) nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die Hauptschale (61) einen konkaven Oberflächenabschnitt (63) aufweist an dem wenigstens eine radiale Rippe (64) ausgebildet ist, die der radialen und/oder axialen Lagerung des Führungsrohrs (50) dient. 6. Hand machine tool (100) according to one of the preceding claims, characterized in that the main shell (61) has a concave surface section (63) on which at least one radial rib (64) is formed, which is the radial and / or axial bearing of the guide tube (50) is used.
7. Handwerkzeugmaschine (100) nach Anspruch 6, dadurch gekennzeichnet, dass die radiale Rippe (64) als Rohteil angeformt und/oder zerspanungsfrei ausgebildet ist. 7. Hand machine tool (100) according to claim 6, characterized in that the radial rib (64) is integrally formed as a blank and / or is designed without machining.
8. Handwerkzeugmaschine (100) nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die Deckschale (65) auf einer dem Exzenterrad (20) zugewandten Seite eine Haltelippe (67) aufweist, deren Verlauf zumindest abschnittsweise einer Kreisbahn (23) eines Exzenterpunktes (21) des Exzenterrades (20) folgt. 8. Hand machine tool (100) according to one of the preceding claims, characterized in that the cover shell (65) has a retaining lip (67) on a side facing the eccentric wheel (20), the course of which at least partially corresponds to a circular path (23) of an eccentric point (21 ) of the eccentric wheel (20) follows.
9. Handwerkzeugmaschine (100) nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die Deckschale (65) mit der Hauptschale (61) verschraubt ist. 9. Hand machine tool (100) according to one of the preceding claims, characterized in that the cover shell (65) is screwed to the main shell (61).
10. Handwerkzeugmaschine (100) nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass das Exzenterrad (20) mittels eines vom Schlagwerk (70) umfassten Lagerzapfens, der drehfest zum und/oder verschieden vom Exzenterrad (20) ausgebildet ist, drehbar in dem Lagerschild (10) gelagert ist. 10. Hand machine tool (100) according to one of the preceding claims, characterized in that the eccentric wheel (20) can be rotated in the end shield by means of a bearing journal encompassed by the hammer mechanism (70), which is non-rotatable to and / or different from the eccentric wheel (20) (10) is stored.
EP21713691.0A 2020-04-03 2021-03-25 Electric handheld power tool Pending EP4126465A1 (en)

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EP20168023.8A EP3888851A1 (en) 2020-04-03 2020-04-03 Electric handheld machine tool
PCT/EP2021/057773 WO2021198023A1 (en) 2020-04-03 2021-03-25 Electric handheld power tool

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EP21713691.0A Pending EP4126465A1 (en) 2020-04-03 2021-03-25 Electric handheld power tool

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US3161242A (en) * 1960-05-31 1964-12-15 Skil Corp Rotary-hammer devices and tool element accessories therefor
DE1298954B (en) * 1963-04-26 1969-07-03 Impex Essen Vertrieb Impact device
US4113035A (en) * 1977-04-21 1978-09-12 Licentia Patent-Verwaltungs-G.M.B.H. Hammer drill with drive and percussion elements accommodated in a cylinder
DE4430161A1 (en) * 1994-08-25 1996-02-29 Bosch Gmbh Robert Portable power tool
JP4270887B2 (en) * 2003-01-10 2009-06-03 株式会社マキタ Electric reciprocating tool
US20080006422A1 (en) * 2005-07-05 2008-01-10 Black & Decker Inc. Cylinder support for powered hammer
JP2016112639A (en) * 2014-12-15 2016-06-23 株式会社マキタ Power tool
DE102015205149A1 (en) * 2015-03-23 2016-09-29 Robert Bosch Gmbh Hand tool
JP6987599B2 (en) * 2017-10-20 2022-01-05 株式会社マキタ Strike tool
JP6801798B2 (en) * 2017-12-28 2020-12-16 工機ホールディングス株式会社 Strike work machine

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