EP3901498A1 - Electro-pneumatic percussion mechanism - Google Patents
Electro-pneumatic percussion mechanism Download PDFInfo
- Publication number
- EP3901498A1 EP3901498A1 EP20170526.6A EP20170526A EP3901498A1 EP 3901498 A1 EP3901498 A1 EP 3901498A1 EP 20170526 A EP20170526 A EP 20170526A EP 3901498 A1 EP3901498 A1 EP 3901498A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- eccentric wheel
- connecting rod
- separating element
- chamber
- striking mechanism
- 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.)
- Withdrawn
Links
Images
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
-
- 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
- B25D17/26—Lubricating
-
- 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
- B25D2217/0057—Details related to cleaning or cooling the tool or workpiece
- B25D2217/0065—Use of dust covers
-
- 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
- B25D2250/345—Use of o-rings
-
- 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
- B25D2250/365—Use of seals
Definitions
- the present invention relates to an electropneumatic hammer mechanism for an electric hand tool, in particular a hammer drill and / or chisel hammer.
- the hammer mechanism is equipped with a gear housing, a guide tube arranged at least in sections in the gear housing, an exciter piston movable in the guide tube, a connecting rod coupled to the exciter piston and an eccentric wheel designed as an externally toothed gear.
- the eccentric wheel is coupled on the one hand to the connecting rod and on the other hand is rotatably mounted with respect to the transmission housing.
- Impact mechanisms of the type mentioned at the outset and hand-held machine tools with such impact mechanisms are basically known from the prior art.
- an axial gap is provided between an eccentric wheel surface facing the connecting rod and a connecting rod surface facing the eccentric wheel.
- the axial gap is preferably used to optionally accommodate a lubricating space separating element, or at least a part thereof. It has been found to be advantageous if a radial distance is provided between a contact point farthest away from the axis of rotation in the radial direction, which is between the connecting rod and the eccentric wheel, and the root circle of the eccentric wheel designed as an externally toothed gear.
- the radial distance is preferably used to optionally accommodate a / the lubrication space separating element, or at least a part thereof.
- the invention includes the knowledge that by optionally introducing a lubricating space separating element, for example in markets where a lubricating space separation is not required, the lubricating space separating element can be saved. In markets where lubrication space separation is required, a lubrication space separation element with any seals can be installed.
- a lubrication space separation element with any seals can be installed.
- the hand-held power tools and / or the hammer mechanisms are delivered without a lubrication space separating element when they are first delivered and, depending on the type of use and wear, the lubrication space separating element is introduced in the event of servicing.
- the lubrication space separating element is introduced in the event of servicing.
- the axial gap based on the axis of rotation of the eccentric wheel in the axial direction, is at least 20 percent as large as the thickness of the eccentric wheel in the axial direction. It has been found to be advantageous if the axial gap is at least 5 mm. It has been found to be advantageous for the radial distance between the contact point and the root circle to be at least 5 percent of a root circle diameter (FD) of the root circle. It has been found to be advantageous if the radial distance is at least 5 mm.
- FD root circle diameter
- the hammer mechanism has a lubricating space separating element which is received in the axial gap and / or in the radial distance. It has been found to be advantageous if the lubricating space separating element has an annular sealing collar with a dynamic sealing ring which is arranged coaxially to the axis of rotation and is pressed against the radial distance.
- the lubricating space separating element has an end sealing collar which seals the eccentric wheel at least in sections against a housing wall.
- the front sealing collar can have a static sealing ring which is arranged coaxially to the axis of rotation and is pressed against an inner edge of the gear unit.
- the lubricating space separating element has a sleeve-shaped sealing chamber for receiving a pinion of an electric motor. It has been found to be advantageous if the annular sealing collar, the front sealing collar and the sealing chamber are formed in one piece with one another.
- the lubricating space separating element is free from axial support loads that are brought about directly or indirectly by the connecting rod.
- a height of the annular sealing collar in the axial direction is less than the axial gap.
- the cover shell has, on a side facing the eccentric wheel, a retaining lip for securing the connecting rod in the axial direction.
- a profile of the retaining lip preferably follows, at least in sections, a circular path of an eccentric point of the eccentric wheel.
- a plurality of retaining lips, each configured concentrically to one another, can be provided. The retaining lips can be separated from each other have different diameters.
- the closure cover can have a support collar which extends in the axial direction and rests on the face sealing collar in the axial direction.
- an electric handheld power tool in particular a hammer drill and / or chisel hammer, with a hammer mechanism as described above. It has been found to be advantageous if the handheld power tool has an electric motor with a pinion for directly driving the eccentric wheel via its external toothing.
- the pinion and the external toothing of the eccentric wheel can be located in an engine lubrication chamber.
- the connecting rod and / or a surface portion of the eccentric wheel facing the cover shell are accommodated in a hammer mechanism lubrication space that is hydraulically separated from the engine lubrication space.
- a lubricating space separating element with an annular sealing collar, a face sealing collar and a sealing chamber, which are formed in one piece with one another.
- FIG Fig. 1 A first preferred exemplary embodiment of an electropneumatic hammer mechanism 70 of an electric handheld power tool is shown in FIG Fig. 1 shown.
- 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 electropneumatic hammer mechanism 70 also has an exciter piston 40 that is movable 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 supported by a bearing plate 10 of the transmission housing 60 so that it can rotate about an axis of rotation DA with respect to the transmission housing 60.
- the end shield 10 is integrated into the gear housing 60.
- the eccentric wheel 20 is rotatably mounted on a bearing body 25 by means of a pair of sliding bearings 28.
- the bearing body 25 is inserted non-rotatably into the bearing plate 10.
- the eccentric wheel 20 is designed as an externally toothed 29 gear wheel, which can be rotationally driven by an electric motor 90.
- the electric motor 90 has a pinion 91 which is paired with the external toothing 29.
- an axial gap AS is provided between an eccentric wheel surface EO facing the connecting rod 30 and a connecting rod surface PO facing the eccentric wheel 20.
- the axial gap AS based on the axis of rotation DA of the eccentric wheel 20 in the axial direction AR, is, for example, about 30 percent as large as a thickness DE of the eccentric wheel 20 in the axial direction AR.
- a radial distance RA is provided between a contact point KP farthest away from the axis of rotation DA in the radial direction RR, which exists between the connecting rod 30 and the eccentric wheel 20, and the root circle FK of the external toothing 29 of the eccentric wheel 20.
- the radial distance RA between the contact point KP and the root circle FK is, for example, 5 percent of a root circle diameter FD of the root circle FK of the eccentric wheel.
- the connecting rod 30 has a connecting rod pin 31 which engages in the eccentric wheel 20.
- the contact point KP is located at the transition from the connecting rod pin 31 to the eccentric wheel 20.
- the striking mechanism 70 has an optionally introduced lubricating chamber separating element 90 within the gear housing 60, which realizes a hydraulic separation between the engine lubricating chamber 92 and the striking mechanism lubricating chamber 62.
- the pinion 91 and the external toothing 29 of the eccentric wheel 20 are located in the engine lubrication chamber 92.
- the connecting rod 30 and a wheel surface 26 facing the cover shell 65 are in one Enclosed hammer mechanism lubrication chamber 62, which is hydraulically separated from engine lubrication chamber 92.
- the lubricating space separating element 80 itself has an annular sealing collar 81, a front sealing collar 83 and a sealing chamber 85.
- the annular sealing collar 81, the front sealing collar 83 and the sealing chamber 85 are formed in one piece with one another.
- the lubricating space separating element 80 consists, for example, of plastic.
- the annular sealing collar 81 serves to seal the eccentric wheel 20 on its side facing the cover shell 65.
- the annular sealing collar 81 based on the axial direction AR, is accommodated in the axial gap AS between the connecting rod 30 and the eccentric wheel 20.
- the annular sealing collar 81 rests on the radial distance RA, based on the radial direction RR.
- Axial gap AS and radial distance RA are thus occupied by one and the same separating element in the form of annular sealing collar 81.
- the ring sealing collar 81 is equipped with a dynamic sealing ring 82 which is arranged coaxially to the axis of rotation DA and is pressed against the radial distance RA.
- the end sealing collar 83 serves to seal the eccentric wheel 20 at least in sections against a housing wall 68.
- the end sealing collar 83 has a static sealing ring 84 for this purpose, which is pressed against the housing wall 68 in the axial direction AR.
- the static sealing ring 84 in the exemplary embodiment is shown in FIG Figure 1A arranged in the region of the eccentric wheel 20 coaxially to the axis of rotation DA. In the area of the pinion 91, the static sealing ring 84 is also pressed against the housing wall 68 in the axial direction AR. In this area, however, the sealing ring 84 extends coaxially to the axis of rotation RO of the pinion 91.
- the sleeve-shaped sealing chamber 85 of the lubricating space separating element 80 finally serves to accommodate the pinion 91 of the electric motor 90.
- the gear housing 60 is on an upper side 61 - from here, among other things, the connecting rod 30 and the eccentric wheel 20 are introduced into the gear housing 60 - by a cover shell 65, which is made of plastic, for example.
- the cover shell 65 has a holding lip 67 on a side 63 facing the eccentric wheel 20, the course of the holding lip 67 following a circular path 23 of an eccentric point 21 of the eccentric wheel 20.
- four retaining lips 67 concentric to one another and each having a different diameter are provided. The retaining lips 67 serve to secure the connecting rod 80 in the axial direction AR.
- the connecting rod 30 also secures the eccentric wheel 20 in the axial direction AR by an annular uprising 33 of the connecting rod pin 31 in the eccentric wheel 20 - the contact point KP is incidentally located on this annular uprising 33 30 and indirectly (via the connecting rod 30) responsible for securing the eccentric wheel 20 in the axial direction AR.
- This flow of forces described here manages without the "help" of the lubricating chamber separating element 90.
- the connecting rod 30 and the eccentric wheel 20 are axially secured even without the lubrication space separating element 90, so that if necessary - for example if there is no regulatory requirement - the lubrication space separating element 90 can be dispensed with.
- a lubricating space separating element 90 is provided.
- the cover shell 65 has a support collar 66 extending in the axial direction AR, which rests in the axial direction AR on the front sealing collar 83 and thus also exerts a pressing effect on the static sealing ring 84 in the axial direction AR.
- the lubricating space separating element 90 itself is held in the gear housing 60.
- the eccentric wheel 20 is additionally secured in the axial direction, namely indirectly via the dynamic sealing ring 82 of the annular sealing collar 81, which is formed in one piece with the end sealing collar 83.
- the height of the annular sealing collar 81 is slightly less than the axial gap AS, the annular sealing collar 81 and thus the entire lubricating chamber separating element 90 is free of axial support loads that are directly or indirectly caused by the connecting rod 30.
- the lubricating chamber separating element 90 can thus optionally be encompassed by the striking mechanism 70.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Percussive Tools And Related Accessories (AREA)
Abstract
Elektropneumatisches Schlagwerk für eine elektrische Handwerkzeugmaschine, insbesondere einen Bohr- und/oder Meißelhammer, wobei das Schlagwerk ein Getriebegehäuse, ein zumindest abschnittsweise in dem Getriebegehäuse angeordnetes Führungsrohr, ein in dem Führungsrohr beweglichen Erregerkolben, einen mit dem Erregerkolben gekoppelten Pleuel sowie ein als außenverzahntes Zahnrad ausgebildetes Exzenterrad aufweist, das einerseits mit dem Pleuel gekoppelt und andererseits um eine Drehachse drehbar bezüglich des Getriebegehäuses gelagert ist, das zwischen einer dem Pleuel zugewandten Exzenterrad-Oberfläche und einer dem Exzenterrad zugewandten Pleuel-Oberfläche ein Axialspalt, vorzugsweise zur optionalen Aufnahme zumindest eines Teils eines Schmierraumtrennelements, vorgesehen ist.Electropneumatic percussion mechanism for an electric hand tool, in particular a hammer drill and / or chisel hammer, the percussion mechanism comprising a gear housing, a guide tube arranged at least in sections in the gear housing, an exciter piston movable in the guide tube, a connecting rod coupled to the exciter piston and an externally toothed gear Has eccentric wheel, which is coupled on the one hand to the connecting rod and on the other hand is mounted rotatably about an axis of rotation with respect to the transmission housing, which has an axial gap between an eccentric wheel surface facing the connecting rod and a connecting rod surface facing the eccentric wheel, preferably for the optional accommodation of at least part of a lubricating chamber separating element , is provided.
Description
Die vorliegende Erfindung betrifft ein elektropneumatisches Schlagwerk für eine elektrische Handwerkzeugmaschine, insbesondere einen Bohr- und/oder Meißelhammer. Das Schlagwerk ist ausgestattet mit einem Getriebegehäuse, einem zumindest abschnittsweise in dem Getriebegehäuse angeordneten Führungsrohr, einem in dem Führungsrohr beweglichen Erregerkolben, einem mit dem Erregerkolben gekoppelten Pleuel sowie mit einem als außenverzahntes Zahnrad ausgebildeten Exzenterrad. Das Exzenterrad ist einerseits mit dem Pleuel gekoppelt und andererseits drehbar bezüglich des Getriebegehäuses gelagert.The present invention relates to an electropneumatic hammer mechanism for an electric hand tool, in particular a hammer drill and / or chisel hammer. The hammer mechanism is equipped with a gear housing, a guide tube arranged at least in sections in the gear housing, an exciter piston movable in the guide tube, a connecting rod coupled to the exciter piston and an eccentric wheel designed as an externally toothed gear. The eccentric wheel is coupled on the one hand to the connecting rod and on the other hand is rotatably mounted with respect to the transmission housing.
Schlagwerke der eingangs genannter Art sowie Handwerkzeugmaschinen mit solchen Schlagwerken sind grundsätzlich aus dem Stand der Technik bekannt.Impact mechanisms of the type mentioned at the outset and hand-held machine tools with such impact mechanisms are basically known from the prior art.
Es ist Aufgabe der vorliegenden Erfindung ein Schlagwerk bereitzustellen, das einen vergleichsweise flexibles Einsatz ermöglicht.It is the object of the present invention to provide a striking mechanism which enables a comparatively flexible use.
Die Aufgabe wird dadurch gelöst, dass das zwischen einer dem Pleuel zugewandten Exzenterrad-Oberfläche und einer dem Exzenterrad zugewandten Pleuel-Oberfläche ein Axialspalt vorgesehen ist. Der Axialspalt dient vorzugsweise einer optionalen Aufnahme eines Schmierraumtrennelements, oder zumindest eines Teils davon. Es hat sich als vorteilhaft herausgestellt, wenn zwischen einem in radialer Richtung am weitesten von der Drehachse entfernten Kontaktpunkt, der zwischen Pleuel und Exzenterrad besteht, und dem Fußkreis des als außenverzahntes Zahnrad ausgebildeten Exzenterrades ein Radialabstand vorgesehen ist. Der Radialabstand dient vorzugsweise zur optionalen Aufnahme eines/des Schmierraumtrennelements, oder zumindest eines Teils davon.The object is achieved in that an axial gap is provided between an eccentric wheel surface facing the connecting rod and a connecting rod surface facing the eccentric wheel. The axial gap is preferably used to optionally accommodate a lubricating space separating element, or at least a part thereof. It has been found to be advantageous if a radial distance is provided between a contact point farthest away from the axis of rotation in the radial direction, which is between the connecting rod and the eccentric wheel, and the root circle of the eccentric wheel designed as an externally toothed gear. The radial distance is preferably used to optionally accommodate a / the lubrication space separating element, or at least a part thereof.
Die Erfindung schließt die Erkenntnis ein, dass durch ein optionales Einbringen eines Schmierraumtrennelements, etwa in solchen Märkten, wo eine Schmierraumtrennung nicht erforderlich ist, das Schmierraumtrennelement eingespart werden kann. In Märkten wo eine Schmierraumtrennung erforderlich ist, kann ein Schmierraumtrennelement mit etwaigen Dichtungen eingebracht werden. Durch eine Trennung von Schlagwerksschmierraum und Motorschmierraum ist eine verbesserte Schmierung der Verzahnungsteile, etwa zwischen einem Ritzel eines Elektromotors und einer Außenverzahnung eines Exzenterrades möglich. Zusätzlich ist dadurch eine verbesserte Abschottung gegen Gesteins- und Betonstaub gegeben, wodurch wiederum ein Verschleiß der Paarung Ritzel- Außenverzahnung reduziert oder zumindest zeitlich gestreckt wird. Es ist auch denkbar, dass die Handwerkzeugmaschinen und/oder die Schlagwerke bei Erstauslieferung ohne ein Schmierraumtrennelement ausgeliefert werden und je nach Art der Nutzung und des Verschleißes, im Servicefall das Schmierraumtrennelement eingebracht wird. Durch ein Reduzieren der Teileanzahl werden bei Schlagwerken und/oder Handwerkzeugmaschinen ohne Schmierraumtrennelement Kosten und Gewicht eingespart.The invention includes the knowledge that by optionally introducing a lubricating space separating element, for example in markets where a lubricating space separation is not required, the lubricating space separating element can be saved. In markets where lubrication space separation is required, a lubrication space separation element with any seals can be installed. By separating the hammer mechanism lubrication space and the engine lubrication space, improved lubrication of the toothed parts, for example between a pinion of an electric motor and an external toothing of an eccentric wheel, is possible. In addition, this provides an improved seal against rock and concrete dust, which means In turn, wear of the pairing pinion-external toothing is reduced or at least stretched over time. It is also conceivable that the hand-held power tools and / or the hammer mechanisms are delivered without a lubrication space separating element when they are first delivered and, depending on the type of use and wear, the lubrication space separating element is introduced in the event of servicing. By reducing the number of parts, costs and weight are saved in hammer mechanisms and / or hand-held power tools without a lubrication chamber separating element.
In einer besonders bevorzugten Ausgestaltung ist der Axialspalt, bezogen auf die Drehachse des Exzenterrades in axialer Richtung, mindestens 20 Prozent so groß ist wie die Stärke des Exzenterrades in axialer Richtung. Es hat sich als vorteilhaft herausgestellt, wenn der Axialspalt wenigstens 5mm beträgt. Es hat sich als vorteilhaft herausgestellt, der Radialabstand zwischen dem Kontaktpunkt und dem Fußkreis wenigstens 5 Prozent eines Fußkreisdurchmessers (FD) des Fußkreises beträgt. Es hat sich als vorteilhaft herausgestellt, wenn der Radialabstand wenigstens 5 mm beträgt.In a particularly preferred embodiment, the axial gap, based on the axis of rotation of the eccentric wheel in the axial direction, is at least 20 percent as large as the thickness of the eccentric wheel in the axial direction. It has been found to be advantageous if the axial gap is at least 5 mm. It has been found to be advantageous for the radial distance between the contact point and the root circle to be at least 5 percent of a root circle diameter (FD) of the root circle. It has been found to be advantageous if the radial distance is at least 5 mm.
In einer besonders bevorzugten Ausgestaltung, vorzugsweise für einen spezifischen Markt, weist das Schlagwerk ein Schmierraumtrennelement auf, welches in dem Axialspalt und/oder in dem Radialabstand aufgenommen ist. Es hat sich als vorteilhaft herausgestellt, wenn das Schmierraumtrennelement eine Ringdichtmanschette mit einem dynamischen Dichtring aufweist, der koaxial zur Drehachse angeordnet und gegen den Radialabstand gepresst ist.In a particularly preferred embodiment, preferably for a specific market, the hammer mechanism has a lubricating space separating element which is received in the axial gap and / or in the radial distance. It has been found to be advantageous if the lubricating space separating element has an annular sealing collar with a dynamic sealing ring which is arranged coaxially to the axis of rotation and is pressed against the radial distance.
In einer weiteren bevorzugten Ausgestaltung weist das Schmierraumtrennelement eine Stirndichtmanschette auf, die das Exzenterrad zumindest abschnittweise gegenüber einer Gehäusewand abdichtet. Die Stirndichtmanschette kann einen statischen Dichtring aufweisen, der koaxial zur Drehachse angeordnet und gegen einen Getriebeinnenrand gepresst ist. In einer weiteren bevorzugten Ausgestaltung weist das Schmierraumtrennelement eine hülsenförmige Dichtkammer zur Aufnahme eines Ritzels eines Elektromotors auf. Es hat sich als vorteilhaft herausgestellt, wenn die Ringdichtmanschette, die Stirndichtmanschette und die Dichtkammer einstückig miteinander ausgebildet sind.In a further preferred embodiment, the lubricating space separating element has an end sealing collar which seals the eccentric wheel at least in sections against a housing wall. The front sealing collar can have a static sealing ring which is arranged coaxially to the axis of rotation and is pressed against an inner edge of the gear unit. In a further preferred embodiment, the lubricating space separating element has a sleeve-shaped sealing chamber for receiving a pinion of an electric motor. It has been found to be advantageous if the annular sealing collar, the front sealing collar and the sealing chamber are formed in one piece with one another.
In einer besonders bevorzugten Ausgestaltung ist das Schmierraumtrennelement frei von axialen Stützlasten, die mittelbar oder unmittelbar durch den Pleuel bewirkt werden. Vorteilhafterweise, ist eine Höhe der Ringdichtmanschette in axialer Richtung geringer als der Axialspalt. In einer besonders bevorzugten Ausgestaltung weist die Deckschale, auf einer dem Exzenterrad zugewandten Seite, eine Haltelippe zur Sicherung des Pleuels in axialer Richtung aufweist. Vorzugsweise folgt ein Verlauf der Haltelippe zumindest abschnittsweise einer Kreisbahn eines Exzenterpunktes des Exzenterrades. Es können mehrere, jeweils konzentrisch zueinander ausgebildete Haltelippen vorgesehen sein. Die Haltelippen können voneinander verschiedene Durchmesser aufweisen. Der Verschlussdeckel kann einen sich in axialer Richtung erstreckenden Stützkragen aufweisen, der in axialer Richtung auf der Stirndichtmanschette aufsteht.In a particularly preferred embodiment, the lubricating space separating element is free from axial support loads that are brought about directly or indirectly by the connecting rod. Advantageously, a height of the annular sealing collar in the axial direction is less than the axial gap. In a particularly preferred embodiment, the cover shell has, on a side facing the eccentric wheel, a retaining lip for securing the connecting rod in the axial direction. A profile of the retaining lip preferably follows, at least in sections, a circular path of an eccentric point of the eccentric wheel. A plurality of retaining lips, each configured concentrically to one another, can be provided. The retaining lips can be separated from each other have different diameters. The closure cover can have a support collar which extends in the axial direction and rests on the face sealing collar in the axial direction.
Die Aufgabe wird ebenfalls gelöst durch eine elektrische Handwerkzeugmaschine, insbesondere einen Bohr- und/oder Meißelhammer, mit einem vorbeschriebenen Schlagwerk. Es hat sich als vorteilhaft herausgestellt, wenn die Handwerkzeugmaschine einen Elektromotor mit einem Ritzel zum unmittelbaren Antreiben des Exzenterrades über dessen Außenverzahnung aufweist. Das Ritzel und die Außenverzahnung des Exzenterrades können in einem Motorschmierraum befindlich sein. In einer weiteren bevorzugten Ausgestaltung sind der Pleuel und/oder ein der Deckschale zugewandter Oberflächenanteil des Exzenterrades in einem vom Motorschmierraum hydraulisch getrennten Schlagwerksschmierraum untergebracht.The object is also achieved by an electric handheld power tool, in particular a hammer drill and / or chisel hammer, with a hammer mechanism as described above. It has been found to be advantageous if the handheld power tool has an electric motor with a pinion for directly driving the eccentric wheel via its external toothing. The pinion and the external toothing of the eccentric wheel can be located in an engine lubrication chamber. In a further preferred embodiment, the connecting rod and / or a surface portion of the eccentric wheel facing the cover shell are accommodated in a hammer mechanism lubrication space that is hydraulically separated from the engine lubrication space.
Die Aufgabe wird ebenfalls gelöst durch ein Schmierraumtrennelement mit einer Ringdichtmanschette, einer Stirndichtmanschette und einer Dichtkammer, die einstückig miteinander ausgebildet sind.The object is also achieved by a lubricating space separating element with an annular sealing collar, a face sealing collar and a sealing chamber, which are formed in one piece with one another.
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 zeigt:
- Figur 1
- ein bevorzugtes Ausführungsbeispiel eines erfindungsgemäßen Schlagwerks.
- Figure 1
- a preferred embodiment of a striking mechanism according to the invention.
Ein erstes bevorzugtes Ausführungsbeispiel eines elektropneumatischen Schlagwerks 70 einer elektrischen Handwerkzeugmaschine ist in
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 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 um eine Drehachse DA drehbar bezüglich des Getriebegehäuses 60 gelagert. Das Lagerschild 10 ist in das Getriebegehäuses 60 integriert. Das Exzenterrad 20 ist auf einem Lagerkörper 25 mittels einer Gleitlagerpaarung 28 drehbar gelagert. Der Lagerkörper 25 ist drehfest in das Lagerschild 10 eingebracht. Das Exzenterrad 20 ist als außenverzahntes 29 Zahnrad ausgebildet, das über einen Elektromotor 90 rotatorisch angetrieben werden kann. Der Elektromotor 90 weist dafür ein Ritzel 91 auf, das mit der Außenverzahnung 29 gepaart ist.The
Wie der
Das Schlagwerk 70 weist innerhalb des Getriebegehäuses 60 ein optional eingebrachtes Schmierraumtrennelement 90 auf, welches eine hydraulische Trennung zwischen Motorschmierraum 92 und Schlagwerksschmierraum 62 realisiert. Das Ritzel 91 und die Außenverzahnung 29 des Exzenterrades 20 sind im Motorschmierraum 92 befindlich. Der Pleuel 30 sowie eine der Deckschale 65 zugewandte Radoberfläche 26 (deren Durchmesser vorzugsweise höchstens dem Fußkreisdurchmesser FK entspricht) sind in einem Schlagwerksschmierraum 62 untergebracht, der vom Motorschmierraum 92 hydraulisch getrennt ist.The
Das Schmierraumtrennelement 80 selbst weist eine Ringdichtmanschette 81, eine Stirndichtmanschette 83 und eine Dichtkammer 85 auf. Im vorliegend dargestellten Ausführungsbeispiel sind die Ringdichtmanschette 81, die Stirndichtmanschette 83 und die Dichtkammer 85 einstückig miteinander ausgebildet. Das Schmierraumtrennelement 80 besteht beispielhaft aus Kunststoff.The lubricating
Die Ringdichtmanschette 81 dient dem Abdichten des Exzenterrades 20 auf seiner der Deckelschale 65 zugewandten Seite. Dazu ist die Ringdichtmanschette 81, bezogen auf die axiale Richtung AR, im Axialspalt AS zwischen Pleuel 30 und Exzenterrad 20 untergebracht. Gleichsam liegt die Ringdichtmanschette 81, bezogen auf die radiale Richtung RR, auf dem Radialabstand RA auf. Somit ist Axialspalt AS und Radialabstand RA mit ein- und demselben Trennelement in Form der Ringdichtmanschette 81 belegt. Die Ringdichtmanschette 81 ist ausgestattet mit einem dynamischen Dichtring 82, der koaxial zur Drehachse DA angeordnet und gegen den Radialabstand RA gepresst ist.The
Die Stirndichtmanschette 83 dient dem Abdichten des Exzenterrades 20 zumindest abschnittweise gegenüber einer Gehäusewand 68. Die Stirndichtmanschette 83 weist dafür einen statischen Dichtring 84 auf, der gegen die Gehäusewand 68 in axialer Richtung AR gepresst ist. Dabei ist der statische Dichtring 84 beim Ausführungsbeispiel der
Die hülsenförmige Dichtkammer 85 des Schmierraumtrennelements 80 dient schließlich zur Aufnahme des Ritzels 91 des Elektromotors 90.The sleeve-shaped
Wie der
Im Ausführungsbeispiel der
- 1010
- LagerschildBearing shield
- 2020th
- ExzenterradEccentric wheel
- 2121
- ExzenterpunktEccentric point
- 2323
- KreisbahnCircular path
- 2525th
- LagerkörperBearing body
- 2626th
- RadoberflächeWheel surface
- 2828
- GleitlagerpaarungPlain bearing pairing
- 2929
- AußenverzahnungExternal gearing
- 3030th
- PleuelConnecting rod
- 3131
- PleuelzapfenConnecting rod pin
- 3333
- Aufstandrevolt
- 4040
- ErregerkolbenExciter piston
- 5050
- FührungsrohrGuide tube
- 6060
- GetriebegehäuseGear housing
- 6161
- OberseiteTop
- 6262
- SchlagwerksschmierraumImpact lubrication room
- 6363
- zugewandte Seitefacing side
- 6565
- DeckelschaleLid shell
- 6666
- StützkragenSupport collar
- 6767
- HaltelippeRetaining lip
- 6868
- GehäusewandHousing wall
- 7070
- SchlagwerkPercussion
- 8080
- SchmierraumtrennelementLubricating space separator
- 8181
- RingdichtmanschetteRing sealing sleeve
- 8282
- dynamischer Dichtringdynamic sealing ring
- 8383
- StirndichtmanschetteForehead sealing sleeve
- 8484
- statischer Dichtringstatic sealing ring
- 8585
- DichtkammerSealing chamber
- 9090
- ElektromotorElectric motor
- 9191
- Ritzelpinion
- 9292
- MotorschmierraumEngine lubrication space
- ARAR
- axiale Richtungaxial direction
- ASAS
- AxialspaltAxial gap
- DATHERE
- Drehachse des ExzenterradesAxis of rotation of the eccentric wheel
- DEDE
- Stärke des ExzenterradesStrength of the eccentric wheel
- EOEO
- ExenterradoberflächeEccentric wheel surface
- FKFK
- FußkreisFoot circle
- KPKP
- KontaktpunktContact point
- FDFD
- FußkreisdurchmesserRoot diameter
- POPO
- PleueloberflächeConnecting rod surface
- RARA
- RadialabstandRadial distance
- RORO
- Rotationsachse des RitzelsAxis of rotation of the pinion
- RRRR
- radiale Richtungradial direction
Claims (14)
dadurch gekennzeichnet, dass das zwischen einer dem Pleuel (30) zugewandten Exzenterrad-Oberfläche (EA) und einer dem Exzenterrad (20) zugewandten Pleuel-Oberfläche (PO) ein Axialspalt (AS), vorzugsweise zur optionalen Aufnahme zumindest eines Teils eines Schmierraumtrennelements (80), vorgesehen ist.Electropneumatic hammer mechanism (70) for an electric hand tool, in particular a hammer drill and / or chisel hammer, the hammer mechanism (70) comprising a gear housing (60), a guide tube (50) arranged at least in sections in the gear housing (60), and a guide tube (50) has movable exciter piston (40), a connecting rod (30) coupled to the exciter piston (40) and an eccentric wheel (20) designed as an externally toothed (29) gear, which is coupled on the one hand to the connecting rod (30) and on the other hand around an axis of rotation (DA) is rotatably mounted with respect to the gear housing (60),
characterized in that there is an axial gap (AS) between an eccentric wheel surface (EA) facing the connecting rod (30) and a connecting rod surface (PO) facing the eccentric wheel (20), preferably for optionally receiving at least part of a lubricating chamber separating element (80 ), is provided.
dadurch gekennzeichnet, dass zwischen einem in radialer Richtung (RR) am weitesten von der Drehachse (DA) entfernten Kontaktpunkt (KP), der zwischen Pleuel (30) und Exzenterrad (20) besteht, und dem Fußkreis (FK) des als außenverzahntes (29) Zahnrad ausgebildeten Exzenterrades (20) ein Radialabstand (RA), vorzugsweise zur optionalen Aufnahme zumindest eines Teils eines Schmierraumtrennelements (80), vorgesehen ist.Striking mechanism (70) according to claim 1,
characterized in that between a contact point (KP) which is farthest away from the axis of rotation (DA) in the radial direction (RR) and which exists between the connecting rod (30) and the eccentric wheel (20), and the root circle (FK) of the externally toothed (29 ) Gear formed eccentric wheel (20) a radial distance (RA), preferably for the optional reception of at least part of a lubricating chamber separating element (80) is provided.
dadurch gekennzeichnet, dass der Axialspalt, bezogen auf die Drehachse (DA) des Exzenterrades (20) in axialer Richtung (AR), mindestens 20 Prozent so groß ist wie die Stärke des Exzenterrades (20) in axialer Richtung (AR).Striking mechanism (70) according to claim 1 or 2,
characterized in that the axial gap, based on the axis of rotation (DA) of the eccentric wheel (20) in the axial direction (AR), is at least 20 percent as large as the thickness of the eccentric wheel (20) in the axial direction (AR).
dadurch gekennzeichnet, dass der Radialabstand (RA) zwischen dem Kontaktpunkt (KP) und dem Fußkreis (FK) wenigstens 5 Prozent eines Fußkreisdurchmessers (FD) des Fußkreises (FK) beträgt.Striking mechanism (70) according to claim 2 or 3,
characterized in that the radial distance (RA) between the contact point (KP) and the root circle (FK) is at least 5 percent of a root circle diameter (FD) of the root circle (FK).
dadurch gekennzeichnet, dass das Schlagwerk (70) ein Schmierraumtrennelement (80) aufweist, welches in dem Axialspalt (AS) und/oder in dem Radialabstand (RA) aufgenommen ist.Striking mechanism (70) according to one of the preceding claims,
characterized in that the hammer mechanism (70) has a lubricating chamber separating element (80) which is received in the axial gap (AS) and / or in the radial distance (RA).
dadurch gekennzeichnet, dass das Schmierraumtrennelement (80) eine Ringdichtmanschette (81) mit einem dynamischen Dichtring (82) aufweist, der koaxial zur Drehachse (DA) angeordnet und gegen den Radialabstand (RA) gepresst ist.Striking mechanism (70) according to claim 5,
characterized in that the lubricating chamber separating element (80) has an annular sealing collar (81) with a dynamic sealing ring (82) which is arranged coaxially to the axis of rotation (DA) and is pressed against the radial distance (RA).
dadurch gekennzeichnet, dass das Schmierraumtrennelement (80) eine Stirndichtmanschette (83) aufweist, die das Exzenterrad (20) zumindest abschnittweise gegenüber einer Gehäusewand (68) abdichtet und die einen statischen Dichtring (84) aufweist, der vorzugsweise zumindest abschnittsweise koaxial zur Drehachse (DA) angeordnet und gegen die Gehäusewand (68) gepresst ist.Striking mechanism (70) according to claim 5 or 6,
characterized in that the lubricating chamber separating element (80) has a face sealing collar (83) which seals the eccentric wheel (20) at least in sections against a housing wall (68) and which has a static sealing ring (84) which is preferably at least in sections coaxial to the axis of rotation (DA ) is arranged and pressed against the housing wall (68).
dadurch gekennzeichnet, dass das Schmierraumtrennelement (80) eine hülsenförmige Dichtkammer (85) zur Aufnahme eines Ritzels (91) eines Elektromotors (90) aufweist.Striking mechanism (70) according to one of Claims 5 to 7,
characterized in that the lubricating space separating element (80) has a sleeve-shaped sealing chamber (85) for receiving a pinion (91) of an electric motor (90).
dadurch gekennzeichnet, dass das die Ringdichtmanschette (81), die Stirndichtmanschette (83) und die Dichtkammer (85) einstückig miteinander ausgebildet sind.Striking mechanism (70) according to claim 8,
characterized in that the ring sealing collar (81), the front sealing collar (83) and the sealing chamber (85) are formed in one piece with one another.
dadurch gekennzeichnet, dass das Schmierraumtrennelement (80) frei von axialen Stützlasten ist, die mittelbar oder unmittelbar durch den Pleuel (30) bewirkt werden.Striking mechanism (70) according to one of Claims 5 to 9,
characterized in that the lubricating space separating element (80) is free of axial support loads which are brought about directly or indirectly by the connecting rod (30).
dadurch gekennzeichnet, dass die Deckschale (65) auf einer dem Exzenterrad (20) zugewandten Seite eine Haltelippe (67) zur Sicherung des Pleuels (30) in axialer Richtung (AR) aufweist, wobei ein Verlauf der Haltelippe zumindest abschnittsweise einer Kreisbahn (23) eines Exzenterpunktes (21) des Exzenterrades (20) folgt.Striking mechanism (70) according to one of Claims 5 to 10,
characterized in that the cover shell (65) has a retaining lip (67) on a side facing the eccentric wheel (20) for securing the connecting rod (30) in the axial direction (AR), wherein a course of the retaining lip follows, at least in sections, a circular path (23) of an eccentric point (21) of the eccentric wheel (20).
dadurch gekennzeichnet, dass die Handwerkzeugmaschine einen Elektromotor (90) mit einem Ritzel (91) zum unmittelbaren Antreiben des Exzenterrades (20) über dessen Außenverzahnung (29) aufweist, wobei das Ritzel (91) und die Außenverzahnung (29) des Exzenterrades (20) in einem Motorschmierraum (92) befindlich sind, und wobei der Pleuel (30) sowie eine der Deckschale (65) zugewandte Radoberfläche (26) des Exzenterrades (20) in einem Schlagwerksschmierraum (62) untergebracht sind, der vom Motorschmierraum (92) hydraulisch getrennt ist.Hand machine tool according to Claim 12,
characterized in that the hand tool has an electric motor (90) with a pinion (91) for directly driving the eccentric wheel (20) via its external toothing (29), the pinion (91) and the external toothing (29) of the eccentric wheel (20) are located in an engine lubrication chamber (92), and the connecting rod (30) and a wheel surface (26) of the eccentric wheel (20) facing the cover shell (65) are housed in an impact mechanism lubrication chamber (62) which is hydraulically separated from the engine lubrication chamber (92) is.
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP20170526.6A EP3901498A1 (en) | 2020-04-21 | 2020-04-21 | Electro-pneumatic percussion mechanism |
US17/916,928 US20230150103A1 (en) | 2020-04-21 | 2021-04-07 | Electropneumatic impact mechanism |
CN202180028684.4A CN115398130A (en) | 2020-04-21 | 2021-04-07 | Electric pneumatic impact mechanism |
EP21717073.7A EP4139592A1 (en) | 2020-04-21 | 2021-04-07 | Electropneumatic percussion mechanism |
PCT/EP2021/059072 WO2021213804A1 (en) | 2020-04-21 | 2021-04-07 | Electropneumatic percussion mechanism |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP20170526.6A EP3901498A1 (en) | 2020-04-21 | 2020-04-21 | Electro-pneumatic percussion mechanism |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3901498A1 true EP3901498A1 (en) | 2021-10-27 |
Family
ID=70390824
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20170526.6A Withdrawn EP3901498A1 (en) | 2020-04-21 | 2020-04-21 | Electro-pneumatic percussion mechanism |
EP21717073.7A Pending EP4139592A1 (en) | 2020-04-21 | 2021-04-07 | Electropneumatic percussion mechanism |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP21717073.7A Pending EP4139592A1 (en) | 2020-04-21 | 2021-04-07 | Electropneumatic percussion mechanism |
Country Status (4)
Country | Link |
---|---|
US (1) | US20230150103A1 (en) |
EP (2) | EP3901498A1 (en) |
CN (1) | CN115398130A (en) |
WO (1) | WO2021213804A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN116587226A (en) * | 2023-07-14 | 2023-08-15 | 江苏东成工具科技有限公司 | Air compression device and electric tool thereof |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2605998A1 (en) * | 1976-02-14 | 1977-08-18 | Licentia Gmbh | Hammer drill with cylinder and striker - has shoulder with air control ports round cylinder located in hammer drill housing to prevent twisting |
EP1182012A2 (en) * | 2000-07-18 | 2002-02-27 | HILTI Aktiengesellschaft | Electrically powered portable tool with electro-pneumatic percussion mechanism |
US20090266572A1 (en) * | 2005-12-22 | 2009-10-29 | Gerhard Meixner | Hand-held power tool, in particular a rotary hammer and/or chisel hammer |
DE102013221117A1 (en) * | 2013-10-17 | 2015-05-07 | Robert Bosch Gmbh | Power transmission component with lubricant supply depot |
EP2873488A1 (en) * | 2013-11-13 | 2015-05-20 | HILTI Aktiengesellschaft | Manual tool machine |
-
2020
- 2020-04-21 EP EP20170526.6A patent/EP3901498A1/en not_active Withdrawn
-
2021
- 2021-04-07 CN CN202180028684.4A patent/CN115398130A/en active Pending
- 2021-04-07 EP EP21717073.7A patent/EP4139592A1/en active Pending
- 2021-04-07 US US17/916,928 patent/US20230150103A1/en active Pending
- 2021-04-07 WO PCT/EP2021/059072 patent/WO2021213804A1/en unknown
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2605998A1 (en) * | 1976-02-14 | 1977-08-18 | Licentia Gmbh | Hammer drill with cylinder and striker - has shoulder with air control ports round cylinder located in hammer drill housing to prevent twisting |
EP1182012A2 (en) * | 2000-07-18 | 2002-02-27 | HILTI Aktiengesellschaft | Electrically powered portable tool with electro-pneumatic percussion mechanism |
US20090266572A1 (en) * | 2005-12-22 | 2009-10-29 | Gerhard Meixner | Hand-held power tool, in particular a rotary hammer and/or chisel hammer |
DE102013221117A1 (en) * | 2013-10-17 | 2015-05-07 | Robert Bosch Gmbh | Power transmission component with lubricant supply depot |
EP2873488A1 (en) * | 2013-11-13 | 2015-05-20 | HILTI Aktiengesellschaft | Manual tool machine |
Also Published As
Publication number | Publication date |
---|---|
CN115398130A (en) | 2022-11-25 |
EP4139592A1 (en) | 2023-03-01 |
US20230150103A1 (en) | 2023-05-18 |
WO2021213804A1 (en) | 2021-10-28 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP1940593A1 (en) | Electric machine tool | |
EP3638457B1 (en) | Hand-held power tool | |
EP1987926A2 (en) | Hand-tool machine with lubricated impact mechanism | |
DE102006045842A1 (en) | Hand tool | |
EP0589337B1 (en) | Hand tool machine, particularly a hammer drill | |
DE2938513C2 (en) | ||
DE102015201573A1 (en) | Impact device, in particular for an impact wrench | |
EP1781447A1 (en) | Housing device for a machine tool with a tool holder and tool holder | |
DE1909999U (en) | IMPACT TOOLS. | |
EP3901498A1 (en) | Electro-pneumatic percussion mechanism | |
EP0266305B1 (en) | Drillhammer with percussion mechanism | |
DE102007062248A1 (en) | Hand tool with a, at least one rotatably mounted intermediate shaft comprehensive gear device | |
EP2212063B1 (en) | Hand-held machine tool | |
CH695487A5 (en) | Machine tool having a gear housing with lubricant and a pressure equalization means of the transmission space. | |
DE19543334B4 (en) | Connection of torque transmitting machine parts | |
CH682312A5 (en) | ||
CH635771A5 (en) | Tool and tool holder for a percussive or rotary-percussive hammer | |
EP0375917B1 (en) | Drilling machine | |
DE19920264A1 (en) | Tool receiver for high-frequency spindle, with device for positioning clamping segments in direction of rotation | |
EP2451615A1 (en) | Hammer-drilling and/or cutting device | |
DE102008022455B4 (en) | Rotary Hammer | |
DE19943904A1 (en) | Transmission device for multi-function hand-held tools with pneumatic drill action has bevel pinion to drive second pinion and counter-rotating beel gears | |
DE2605998B2 (en) | Rotary hammer with drive and impact elements housed in a cylinder | |
DE19844501B4 (en) | Hand-held drilling machine | |
DE102006060319A1 (en) | Machine tool with a bearing provided with an anti-rotation slide bearing |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN PUBLISHED |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
B565 | Issuance of search results under rule 164(2) epc |
Effective date: 20201022 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 20220429 |