EP2116333B1 - Hammer drill - Google Patents
Hammer drill Download PDFInfo
- Publication number
- EP2116333B1 EP2116333B1 EP09158888.9A EP09158888A EP2116333B1 EP 2116333 B1 EP2116333 B1 EP 2116333B1 EP 09158888 A EP09158888 A EP 09158888A EP 2116333 B1 EP2116333 B1 EP 2116333B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- spindle
- ring
- hammer
- tool spindle
- hammer drill
- 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.)
- Not-in-force
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Classifications
-
- 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
- B25D11/00—Portable percussive tools with electromotor or other motor drive
- B25D11/005—Arrangements for adjusting the stroke of the impulse member or for stopping the impact action when the tool is lifted from the working surface
-
- 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
- B25D17/24—Damping the reaction force
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D2211/00—Details of portable percussive tools with electromotor or other motor drive
- B25D2211/003—Crossed drill and motor spindles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D2216/00—Details of portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
- B25D2216/0007—Details of percussion or rotation modes
- B25D2216/0023—Tools having a percussion-and-rotation mode
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D2222/00—Materials of the tool or the workpiece
- B25D2222/21—Metals
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D2222/00—Materials of the tool or the workpiece
- B25D2222/54—Plastics
- B25D2222/57—Elastomers, e.g. rubber
-
- 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
- B25D2250/191—Ram catchers for stopping the ram when entering idling mode
Definitions
- the present invention relates to a hammer drill for a hand-held operation, with the features of the preamble of claim 1.
- a hammer drill is from the FR 2 552 696 A known.
- An intended for a hand-held operation rotary hammer usually includes an electric drive motor, a rotatably driven about a spindle axis tool spindle and a pneumatic hammer mill.
- Such a hammer drill is from the DE 10 2006 054 288 from 17.11.2006 known.
- the hammer mechanism comprises a coaxial with the spindle axis oriented catching ring into which the striker dips when reaching a front end position with an end portion.
- the catch ring the hold it immersed impactor with a predetermined holding force, which greatly simplifies the handling of the hammer drill.
- the hammer operation begins only when a sufficient contact pressure is applied via the tool over which the striker pushes out the striker from the catch ring, whereby this is released and can follow the pneumatic pressure surges of the plunger.
- Such a catching ring is exposed during operation of the hammer drill relatively high loads and therefore susceptible to wear.
- the present invention is concerned with the problem of providing a rotary hammer of the type mentioned an improved embodiment, which is characterized in particular by the fact that the catching ring is exposed to reduced wear, at the same time a comparatively simple and safe mountability is to be achieved.
- the present invention is based on the general idea of fixing the catching ring in the tool spindle with the aid of two disks, namely with a catching disk and with a non-return disk.
- the catching ring is supported on a striker side facing the rebound disc at an annular stage of the tool spindle axially, while he is axially supported on a side facing the striker on the catch disc on a locking ring, which is inserted into a machined into the tool spindle ring groove.
- the mechanical stress of the catch ring can be reduced in this design, which significantly reduces the wear of the catch ring.
- the catching ring can be better designed with regard to its material to grasp and fix the striking body.
- the catching ring, the catching disk and the return disk are each designed mirror-symmetrically with respect to a central plane extending perpendicular to the spindle axis.
- This design prevents the individual elements are mounted laterally reversed in the tool spindle.
- a reversed installation with asymmetrical elements can already lead to a failure of the respective element after a very short period of operation and should therefore be avoided.
- the assembly of asymmetric elements requires the respective installer increased care, which is laborious and time consuming. In an automated assembly, an increased effort must be operated in order to avoid reverse assembly of the elements can. Due to the proposed mirror-symmetrical design of the individual elements said additional effort is avoidable.
- the assembly Simplifies itself accordingly, the hammer drill can be made cheaper at increased quality.
- non-inventive solution may be provided to design the catching disk and the non-return plate as equal parts. Due to this construction catching disc and kick-back disc are confusion-proof, which also represents a simplification of assembly and brings with reduced manufacturing costs an increased manufacturing quality.
- a coaxially oriented to the spindle axis brake ring may be provided, in which the striker dips with a preceding end portion.
- This brake ring can now also be designed mirror-symmetrically with respect to a plane perpendicular to the spindle axis center plane. This also makes it easier to mount.
- the hammer drill 1 contains in its housing 2 an electric drive motor 4 and a tool spindle 5 and a pneumatic hammer 6.
- the drive motor 4 has a drive shaft 7, which rotates about a shaft axis 8 during operation of the hammer drill 1.
- the drive motor 4 drives the tool spindle 5 in rotation about a spindle axis 9.
- the drive motor 4 in the example shown via a spindle gear 10 with the tool spindle 5 drive-coupled.
- the spindle gear 10 is preferably a single-stage gear, via which the tool spindle 5 is driven directly by the drive shaft 7.
- the spindle gear 10 is preferably designed as an angle gear and accordingly has a pinion 11 attached to or formed on the drive shaft 7 and engaged with a ring gear 12 which serves to transmit torque to the tool spindle 5. It is expedient between the ring gear 12 and the tool spindle 5, a safety clutch 13 is arranged, which allows a torque limit between the drive motor 4 and 5 tool spindle.
- the pinion 11 has a radial toothing, which meshes with an axial end toothing of the ring gear 12, whereby the ring gear 12 is a crown wheel.
- the hammer mechanism 6 comprises a pressure piston 14, which is mounted in a stroke-adjustable manner directly in the tool spindle 5 and can be driven via a hammer mechanism 15 with the aid of the drive motor 4.
- a further piston 16 is also mounted adjustable in stroke, which is hereinafter referred to as impactor 16 and which is pneumatically driven via the pressure piston 14.
- yet another piston 17 is mounted adjustable in stroke, which is referred to below as a striker 17. This is the impactor 16 abuttable, so driven by direct mechanical contact.
- the striker 17 is now used for axial abutment on a not shown here tool for the operation of the hammer drill 1 of a Chuck of the tool spindle 5 is added and it is usually a drill.
- the hammer gear 15 has in the preferred embodiment shown here, a drive wheel 18 which is driven directly from the pinion 11, preferably in the same axial portion as the ring gear 12.
- a not shown here rotational axis of the drive wheel 18 preferably extends parallel to the shaft axis
- a connecting rod 20 is articulated eccentrically via a pin 19, which drives the pressure piston 14.
- a crank mechanism is formed, the stroke of the drive wheel 18 via the connecting rod 20, the pressure piston 14 between two dead points back and forth strokeveriques.
- pressure surges or pressure pulses are generated in a pressure chamber 21, which is located in the tool spindle 5 axially between the pressure piston 14 and the striker 16, which drive the striker 16 accordingly. This can abut against the striker 17 according to the frequency of the pressure surges, whereby the striker 17 ultimately proposes according to the frequency of the pressure surges against the respective tool.
- the shaft axis 8 and the spindle axis 9 are arranged relative to each other at an angle 22, which is approximately 90 ° in the example shown.
- the angle 22 may be in a range of from 60 ° to 120 ° inclusive.
- a conical toothing can in principle be provided, in particular when the angle 22 deviates from 90 °.
- the hammer mechanism 6 comprises a catching ring 23, which is oriented coaxially with the spindle axis 9.
- the catching ring 23 is arranged in the interior of the tool spindle 5 and thereby axially positioned so that a front or preceding end portion 24 of the impactor 16 can dive into it when the impactor 16 reaches a front end position.
- Fig. 2 is shown a state in which the striker 16 has not yet reached its front end position. Accordingly, its end portion 24 is axially spaced from the catching ring 23 and accordingly not immersed in it.
- Fig. 2 is shown a state in which the striker 16 has not yet reached its front end position. Accordingly, its end portion 24 is axially spaced from the catching ring 23 and accordingly not immersed in it.
- the striker 17 is in its rear end position in which he dives with a rear end portion 25 in the catching ring 23.
- the striker 16 contacts a rear side 27 of the striker 17 on its leading front side 26, thereby enabling pulse transmission.
- a check disc 28 and a catch disc 29 are used for axial fixation of the catching ring 23 in the tool spindle 5.
- the return disc 28 is in this case on the striker 17 facing side of the catch ring 23, while the catch plate 29 is disposed on a side facing the impactor 16 side of the catch ring 23.
- the catching ring 23 is axially supported via the return plate 28 on an annular step 30 of the tool spindle 5.
- the catching ring 23 is supported axially via the catching disk 29 on a securing ring 31.
- This circlip 31 is inserted into an annular groove 32, which is incorporated radially inward into the tool spindle 5.
- the discs 28,29 can be made of a different material than the catching ring 23.
- the discs 28,29 consist of a metal, but may also be made of a plastic. They allow an intensive power transmission between catching ring 23 and tool spindle 5, but they are designed in terms of their shape for a minimal wear of the catching ring 23.
- the catching ring 23 may preferably be designed so that it cooperates when dipping the front end portion 24 of the impactor 16 with a catching contour 33 of the impactor 16, which is formed by an annular circumferential radial recess into which the catching ring 23 can engage radially, if the striker 16 dives sufficiently deep into the catch ring 23 when reaching its front end position.
- the contouring of the preceding end portion 24 of the impactor 16 may have an annular shoulder 34, which upon reaching the front end position of the impactor body 16 at the catch plate 29, in particular flat, comes to rest.
- the catch ring 23, the catch disk 29 and the check disk 28 are each designed mirror-symmetrically with respect to a center plane, not shown here, which extends perpendicularly to the spindle axis 9.
- a center plane not shown here, which extends perpendicularly to the spindle axis 9.
- each of these elements can be mounted against rotation. Back and front are identical, so incorrect mounting can be avoided.
- the catch plate 29 and the return plate 28 to design as equal parts. As a result, a confusion between the tail pulley 29 and check disc 28 can be avoided.
- the components are identical and interchangeable without disadvantage.
- a brake ring 36 is also provided, which is coaxially oriented with respect to the spindle axis 9 and which is axially supported on a further annular step 37 of the tool spindle 5.
- a leading end portion 38 of the striker 17 also dips into the brake ring 36 in the rear end position shown.
- the striker 17 has at its the brake ring 36 facing Side another ring stage 39, with which it comes to rest on the brake ring 36 when reaching its front end position, in particular flat.
- the brake ring 26 may preferably be designed with respect to a plane perpendicular to the spindle axis 9 center plane mirror-symmetrical to be mounted against rotation.
- the brake ring 36 may be made of metal and may dampen the impact of the striker 17 upon reaching the forward end position.
- the striker 17 is expediently designed such that its center of gravity is located approximately centrally in a longitudinal section guided in the tool spindle 5, in which also at least one seal 40 is arranged.
- the impactor 16 and the pressure piston 14 have corresponding seals and are guided directly into or on the tool spindle 5.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Percussive Tools And Related Accessories (AREA)
Description
Die vorliegende Erfindung betrifft einen Bohrhammer für einen handgeführten Betrieb, mit den Merkmalen des Oberbegriffs des Anspruchs 1. Ein solcher Bohrhammer ist aus der
Ein für einen handgeführten Betrieb vorgesehener Bohrhammer umfasst üblicherweise einen elektrischen Antriebsmotor, eine um eine Spindelachse drehend antreibbare Werkzeugspindel sowie ein pneumatisches Hammerwerk.An intended for a hand-held operation rotary hammer usually includes an electric drive motor, a rotatably driven about a spindle axis tool spindle and a pneumatic hammer mill.
Ein derartiger Bohrhammer ist aus der
Ein derartiger Fangring ist im Betrieb des Bohrhammers relativ hohen Belastungen ausgesetzt und daher verschleißanfällig.Such a catching ring is exposed during operation of the hammer drill relatively high loads and therefore susceptible to wear.
Die vorliegende Erfindung beschäftigt sich mit dem Problem, für einen Bohrhammer der eingangs genannten Art eine verbesserte Ausführungsform anzugeben, die sich insbesondere dadurch charakterisiert, dass der Fangring einem reduzierten Verschleiß ausgesetzt ist, wobei gleichzeitig eine vergleichsweise einfache und sichere Montierbarkeit erreicht werden soll.The present invention is concerned with the problem of providing a rotary hammer of the type mentioned an improved embodiment, which is characterized in particular by the fact that the catching ring is exposed to reduced wear, at the same time a comparatively simple and safe mountability is to be achieved.
Dieses Problem wird erfindungsgemäß durch die Gegenstände der unabhängigen Ansprüche gelöst. Vorteilhafte Ausführungsformen sind Gegenstand der abhängigen Ansprüche.This problem is solved according to the invention by the subject matters of the independent claims. Advantageous embodiments are the subject of the dependent claims.
Die vorliegende Erfindung beruht auf dem allgemeinen Gedanken, den Fangring mit Hilfe von zwei Scheiben, nämlich mit einer Fangscheibe und mit einer Rückschlagscheibe, in der Werkzeugspindel zu fixieren. Dabei stützt sich der Fangring an einer dem Döpper zugewandten Seite über die Rückschlagscheibe an einer Ringstufe der Werkzeugspindel axial ab, während er sich an einer dem Schlagkörper zugewandten Seite über die Fangscheibe an einem Sicherungsring axial abstützt, der in eine in die Werkzeugspindel eingearbeitete Ringnut eingesetzt ist. Durch eine entsprechende Materialwahl für die Scheiben kann die mechanische Beanspruchung des Fangrings bei dieser Bauweise reduziert werden, was den Verschleiß des Fangrings signifikant senkt. Gleichzeitig kann der Fangring hinsichtlich seines Werkstoffs besser dafür ausgelegt werden, den Schlagkörper zu greifen und zu fixieren.The present invention is based on the general idea of fixing the catching ring in the tool spindle with the aid of two disks, namely with a catching disk and with a non-return disk. In doing so, the catching ring is supported on a striker side facing the rebound disc at an annular stage of the tool spindle axially, while he is axially supported on a side facing the striker on the catch disc on a locking ring, which is inserted into a machined into the tool spindle ring groove. By an appropriate choice of material for the discs, the mechanical stress of the catch ring can be reduced in this design, which significantly reduces the wear of the catch ring. At the same time, the catching ring can be better designed with regard to its material to grasp and fix the striking body.
Entsprechend einer ersten erfindungsgemäßen Lösung sind nun der Fangring, die Fangscheibe und die Rückschlagscheibe jeweils bezüglich einer senkrecht zur Spindelachse verlaufenden Mittelebene spiegelsymmetrisch ausgestaltet. Durch diese Bauweise wird verhindert, dass die einzelnen Elemente seitenverkehrt in der Werkzeugspindel montiert werden. Eine seitenverkehrte Montage bei asymmetrischen Elementen kann bereits nach sehr kurzer Betriebszeit zu einem Versagen des jeweiligen Elements führen und ist daher zu vermeiden. Die Montage asymmetrischer Elemente erfordert vom jeweiligen Monteur eine erhöhte Sorgfalt, was arbeits- und zeitintensiv ist. Bei einer automatisierten Montage muss ein erhöhter Aufwand betrieben werden, um eine seitenverkehrte Montage der Elemente vermeiden zu können. Durch die vorgeschlagene spiegelsymmetrische Ausgestaltung der einzelnen Elemente ist der genannte Mehraufwand vermeidbar. Die Montage vereinfacht sich entsprechend, der Bohrhammer kann dadurch bei erhöhter Qualität preiswerter hergestellt werden.According to a first solution according to the invention, the catching ring, the catching disk and the return disk are each designed mirror-symmetrically with respect to a central plane extending perpendicular to the spindle axis. This design prevents the individual elements are mounted laterally reversed in the tool spindle. A reversed installation with asymmetrical elements can already lead to a failure of the respective element after a very short period of operation and should therefore be avoided. The assembly of asymmetric elements requires the respective installer increased care, which is laborious and time consuming. In an automated assembly, an increased effort must be operated in order to avoid reverse assembly of the elements can. Due to the proposed mirror-symmetrical design of the individual elements said additional effort is avoidable. The assembly Simplifies itself accordingly, the hammer drill can be made cheaper at increased quality.
Entsprechend einer zweiten, nicht-erfindungsgemäßen Lösung kann vorgesehen sein, die Fangscheibe und die Rückschlagscheibe als Gleichteile auszugestalten. Durch diese Bauweise sind Fangscheibe und Rückschlagscheibe verwechslungssicher, was ebenfalls eine Montageerleichterung darstellt und bei reduzierten Herstellungskosten eine erhöhte Herstellungsqualität mit sich bringt.According to a second, non-inventive solution may be provided to design the catching disk and the non-return plate as equal parts. Due to this construction catching disc and kick-back disc are confusion-proof, which also represents a simplification of assembly and brings with reduced manufacturing costs an increased manufacturing quality.
Es ist klar, dass die beiden alternativen Lösungen auch kumulativ realisierbar sind. Die diesbezüglichen Vorteile hinsichtlich vereinfachter Montage und erhöhter Qualität liegen auf der Hand.It is clear that the two alternative solutions can also be realized cumulatively. The advantages in terms of simplified installation and increased quality are obvious.
Entsprechend einer vorteilhaften Ausführungsform kann zusätzlich ein koaxial zur Spindelachse orientierter Bremsring vorgesehen sein, in den der Döpper mit einem vorausgehenden Endabschnitt eintaucht. Dieser Bremsring kann nun ebenfalls bezüglich einer senkrecht zur Spindelachse verlaufenden Mittelebene spiegelsymmetrisch ausgestaltet sein. Auch hierdurch lässt sich die Montierbarkeit vereinfachen.According to an advantageous embodiment, in addition, a coaxially oriented to the spindle axis brake ring may be provided, in which the striker dips with a preceding end portion. This brake ring can now also be designed mirror-symmetrically with respect to a plane perpendicular to the spindle axis center plane. This also makes it easier to mount.
Weitere wichtige Merkmale und Vorteile der Erfindung ergeben sich aus den Unteransprüchen, aus den Zeichnungen und aus der zugehörigen Figurenbeschreibung anhand der Zeichnungen.Other important features and advantages of the invention will become apparent from the dependent claims, from the drawings and from the associated figure description with reference to the drawings.
Ein bevorzugtes Ausführungsbeispiel der Erfindung sind in den Zeichnungen dargestellt und werden in der nachfolgenden Beschreibung näher erläutert, wobei sich gleiche Bezugszeichen auf gleiche oder ähnliche oder funktional gleiche Bauteile beziehen.A preferred embodiment of the invention are illustrated in the drawings and will be described in more detail in the following description, wherein like reference numerals refer to the same or similar or functionally identical components.
Es zeigen, jeweils schematisch,
- Fig. 1
- einen Längsschnitt durch einen Bohrhammer,
- Fig. 2
- eine vergrößerte Schnittansicht wie in
Fig. 1 im Bereich eines Fangrings.
- Fig. 1
- a longitudinal section through a hammer drill,
- Fig. 2
- an enlarged sectional view as in
Fig. 1 in the area of a catching ring.
Entsprechend
Das Hammerwerk 6 umfasst einen Druckkolben 14, der unmittelbar in der Werkzeugspindel 5 hubverstellbar gelagert ist und über ein Hammergetriebe 15 mit Hilfe des Antriebsmotors 4 antreibbar ist. In der Werkzeugspindel 5 ist außerdem ein weiterer Kolben 16 hubverstellbar gelagert, der im Folgenden als Schlagkörper 16 bezeichnet wird und der über den Druckkolben 14 pneumatisch antreibbar ist. Desweiteren ist in der Werkzeugspindel 5 noch ein weiterer Kolben 17 hubverstellbar gelagert, der im Folgenden als Döpper 17 bezeichnet wird. Dieser ist vom Schlagkörper 16 anstoßbar, also durch direkte mechanische Kontaktierung antreibbar. Der Döpper 17 dient nun zum axialen Anschlagen an ein hier nicht dargestelltes Werkzeug, das für den Betrieb des Bohrhammers 1 von einem Futter der Werkszeugspindel 5 aufgenommen ist und bei dem es sich für gewöhnlich um einen Bohrer handelt.The
Das Hammergetriebe 15 besitzt bei der hier gezeigten, bevorzugten Ausführungsform ein Antriebsrad 18, das unmittelbar vom Ritzel 11 angetrieben ist, und zwar bevorzugt im gleichen Axialabschnitt wie das Tellerrad 12. Eine hier nicht gezeigte Drehachse des Antriebsrads 18 erstreckt sich dabei bevorzugt parallel zur Wellenachse 8. Am Antriebsrad 18 ist exzentrisch über einen Zapfen 19 eine Pleuelstange 20 angelenkt, die den Druckkolben 14 antreibt. Hierdurch wird ein Kurbeltrieb gebildet, der bei drehendem Antriebsrad 18 über die Pleuelstange 20 den Druckkolben 14 zwischen zwei Totpunkten hin und her hubverstellt. Hierdurch werden in einem Druckraum 21, der sich in der Werkzeugspindel 5 axial zwischen dem Druckkolben 14 und dem Schlagkörper 16 befindet, Druckstöße oder Druckimpulse erzeugt, welche den Schlagkörper 16 entsprechend antreiben. Dieser kann gegen den Döpper 17 entsprechend der Frequenz der Druckstöße anstoßen, wodurch der Döpper 17 letztlich entsprechend der Frequenz der Druckstöße gegen das jeweilige Werkzeug schlägt.The
Bei der in
Abweichend von der hier gezeigten Axialverzahnung zwischen Ritzel 11 und Tellerrad 12 kann grundsätzlich auch eine Kegelverzahnung vorgesehen sein, insbesondere dann, wenn der Winkel 22 von 90° abweicht.Notwithstanding the axial toothing shown here between
Entsprechend
Zur axialen Fixierung des Fangrings 23 in der Werkzeugspindel 5 dienen eine Rückschlagscheibe 28 und eine Fangscheibe 29. Die Rückschlagscheibe 28 ist dabei an einer dem Döpper 17 zugewandten Seite des Fangrings 23 angeordnet, während die Fangscheibe 29 an einer dem Schlagkörper 16 zugewandten Seite des Fangrings 23 angeordnet ist. Der Fangring 23 stützt sich über die Rückschlagscheibe 28 an einer Ringstufe 30 der Werkzeugspindel 5 axial ab. Ferner stützt sich der Fangring 23 über die Fangscheibe 29 an einem Sicherungsring 31 axial ab. Dieser Sicherungsring 31 ist dabei in eine Ringnut 32 eingesetzt, die radial innen in die Werkzeugspindel 5 eingearbeitet ist. Die Scheiben 28,29 können aus einem anderen Werkstoff hergestellt sein als der Fangring 23. Hierdurch ist insbesondere eine an die jeweilige Anforderung optimierte Materialauswahl möglich. Die Scheiben 28,29 bestehen beispielsweise aus einem Metall, können jedoch auch aus einem Kunststoff hergestellt sein. Sie ermöglichen eine intensive Kraftübertragung zwischen Fangring 23 und Werkzeugspindel 5, wobei sie jedoch hinsichtlich ihrer Formgebung für einen minimalen Verschleiß des Fangrings 23 ausgelegt sind. Der Fangring 23 kann bevorzugt so ausgestaltet sein, dass er beim Eintauchen des vorderen Endabschnittes 24 des Schlagkörpers 16 mit einer Fangkontur 33 des Schlagkörpers 16 zusammenwirkt, die durch eine ringförmig umlaufende, radiale Vertiefung gebildet ist, in welche der Fangring 23 radial eingreifen kann, wenn der Schlagkörper 16 bei Erreichen seiner vorderen Endstellung hinreichend tief in den Fangring 23 eintaucht.For axial fixation of the catching
Die Konturierung des vorausgehenden Endabschnitts 24 des Schlagkörpers 16 kann dabei eine Ringschulter 34 aufweisen, die bei Erreichen der vorderen Endstellung des Schlagkörpers 16 an der Fangscheibe 29, insbesondere flächig, zur Anlage kommt.The contouring of the
In der gezeigten hinteren Endstellung des Döppers 17 kommt dieser mit einer Ringstufe 35 axial an der Rückschlagscheibe 28 zur Anlage. Außerdem kann sein Endabschnitt 25 hierbei vom Fangring 23 kontaktiert werden.In the illustrated rear end position of the
Beim gezeigten Bohrhammer 1 sind nun der Fangring 23, die Fangscheibe 29 und die Rückschlagscheibe 28 jeweils bezüglich einer hier nicht dargestellten Mittelebene, die sich senkrecht zur Spindelachse 9 erstreckt, spiegelsymmetrisch ausgestaltet. Damit ist jedes einzelne dieser Elemente für sich verdrehsicher montierbar. Rückseite und Vorderseite sind identisch, so dass eine fehlerhafte Montage vermieden werden kann. Darüber hinaus ist bei der hier gezeigten bevorzugten Ausführungsform vorgesehen, die Fangscheibe 29 und die Rückschlagscheibe 28 als Gleichteile auszugestalten. Hierdurch kann auch eine Verwechslung zwischen Fangscheibe 29 und Rückschlagscheibe 28 vermieden werden. Die Bauteile sind identisch und ohne Nachteil gegeneinander austauschbar.In the
Bei der hier gezeigten Ausführungsform ist außerdem ein Bremsring 36 vorgesehen, der bezüglich der Spindelachse 9 koaxial orientiert ist und der an einer weiteren Ringstufe 37 der Werkzeugspindel 5 axial abgestützt ist. Ein vorausgehender Endabschnitt 38 des Döppers 17 taucht auch in der gezeigten hinteren Endstellung in den Bremsring 36 ein. Der Döpper 17 besitzt an seiner dem Bremsring 36 zugewandten Seite eine weitere Ringstufe 39, mit welcher er am Bremsring 36 bei Erreichen seiner vorderen Endstellung, insbesondere flächig, zur Anlage kommt. Auch der Bremsring 26 kann bevorzugt bezüglich einer senkrecht zur Spindelachse 9 verlaufenden Mittelebene spiegelsymmetrisch ausgestaltet sein, um verdrehsicher montierbar zu sein. Der Bremsring 36 kann aus Metall hergestellt sein und kann den Aufschlag des Döppers 17 bei Erreichen der vorderen Endstellung dämpfen.In the embodiment shown here, a brake ring 36 is also provided, which is coaxially oriented with respect to the
Der Döpper 17 ist zweckmäßig so ausgestaltet, dass sich sein Schwerpunkt etwa mittig in einem in der Werkzeugspindel 5 geführten Längsabschnitt befindet, in dem auch wenigstens eine Dichtung 40 angeordnet ist. Auch der Schlagkörper 16 und der Druckkolben 14 besitzen entsprechende Dichtungen und sind unmittelbar in bzw. an der Werkzeugspindel 5 geführt.The
Claims (8)
- A hammer drill for hand-guided operation,- having an electric drive motor (4),- having a tool spindle (5), which can be driven in a rotating manner about a spindle axis (9),- having a pneumatic hammer mechanism (6), which has a pressure piston (14) that is mounted in the tool spindle (5) and can be driven with adjustable stroke, an impactor (16) that is mounted in the tool spindle (5) and pneumatically driven by the pressure piston (14), and a snap hammer (17) that is mounted in the tool spindle (5) and can be struck by the impactor (16) for axially striking a tool accommodated by the tool spindle (5),- wherein an arrester ring (23) orientated coaxially to the spindle axis (9) is provided, into which the impactor (16) dips by means of an end section (24) when reaching a front end position,- wherein the arrester ring (23) is axially supported on an annular step (30) of the tool spindle (5) on a side facing the snap hammer (17) by means of a rebound disc (28),- wherein the arrester ring (23) is axially supported on a retaining ring (31), which is inserted into an annular groove (32) formed on the tool spindle (5), on a side facing the impactor (16) by means of an arrester disc (29),- wherein the arrester ring (23) and the arrester disc (29) are each configured mirror-symmetrically with respect to a central plane running perpendicularly to the spindle axis (9),
characterised in that the rebound disc (28) is configured mirror-symmetrically with respect to a central plane running perpendicularly to the spindle axis (9). - The hammer drill according to claim 1,
characterised in
that the arrester disc (29) and the rebound disc (28) are identical parts. - The hammer drill according to claim 1 or 2,
characterised in
that a brake ring (36) orientated coaxially to the spindle axis (9) is provided, into which the snap hammer (17) dips by means of a front end section (38) and which is configured mirror-symmetrically with respect to a central plane running perpendicularly to the spindle axis (9). - The hammer drill according to one of claims 1 to 3,
characterised in
that the tool spindle (5) is driven directly by a drive shaft (7) of the drive motor (4) by means of a single-stage spindle gearbox (10). - The hammer drill according to claim 4,
characterised in
that the spindle gearbox (10) is configured as an angular gearbox, which has a pinion (11) arranged or constructed on the drive shaft (7) and a ring gear (12) in engagement with the pinion (11). - The hammer drill according to claim 5,
characterised in
that the pinion (11) has radial toothing and in that the ring gear (12) is configured as a crown gear and has an axial spur toothing. - The hammer drill according to one of claims 1 to 6,
characterised in
that the pressure piston (14) is driven directly by a drive shaft (7) of the drive motor (4) by means of a single-stage hammer gearbox (15). - The hammer drill according to one of claims 1 to 7,
characterised in
that a shaft axis (8) of the drive shaft (7) and a spindle axis (9) of the tool spindle (5) are arranged at an angle (22) to one another, wherein the angle (22) lies in a range of 60° inclusive to 120° inclusive, and in particular can be approximately 90°.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102008022454.5A DE102008022454B4 (en) | 2008-05-08 | 2008-05-08 | Rotary Hammer |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2116333A1 EP2116333A1 (en) | 2009-11-11 |
EP2116333B1 true EP2116333B1 (en) | 2014-08-13 |
Family
ID=40863569
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09158888.9A Not-in-force EP2116333B1 (en) | 2008-05-08 | 2009-04-28 | Hammer drill |
Country Status (4)
Country | Link |
---|---|
US (1) | US20090277659A1 (en) |
EP (1) | EP2116333B1 (en) |
CN (1) | CN101574803B (en) |
DE (1) | DE102008022454B4 (en) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102011077220A1 (en) * | 2010-12-21 | 2012-06-21 | Robert Bosch Gmbh | Electric hand tool |
GB201112829D0 (en) * | 2011-07-26 | 2011-09-07 | Black & Decker Inc | Hammer |
CN103386669B (en) * | 2012-05-07 | 2016-03-16 | 苏州宝时得电动工具有限公司 | Electric hammer |
JP2014008559A (en) * | 2012-06-28 | 2014-01-20 | Hitachi Koki Co Ltd | Impact tool |
US11007631B2 (en) | 2014-01-15 | 2021-05-18 | Milwaukee Electric Tool Corporation | Bit retention assembly for rotary hammer |
CA2943806C (en) | 2014-03-27 | 2022-05-31 | Techtronic Power Tools Technology Limited | Powered fastener driver and operating method thereof |
EP3260239A1 (en) * | 2016-06-24 | 2017-12-27 | HILTI Aktiengesellschaft | Handheld machine tool |
CN110125880B (en) * | 2018-02-09 | 2021-03-16 | 苏州宝时得电动工具有限公司 | Locking mechanism and impact tool with same |
EP3683021B1 (en) | 2019-01-16 | 2023-09-13 | Black & Decker Inc. | Hammer drill |
USD1034128S1 (en) * | 2022-02-07 | 2024-07-09 | Robert Bosch Gmbh | Hammer drill |
Family Cites Families (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3269466A (en) * | 1964-07-17 | 1966-08-30 | Rockwell Mfg Co | Impact tool |
US4431062A (en) * | 1980-01-09 | 1984-02-14 | Robert Bosch Gmbh | Rotating drive for impact hammer |
US4462467A (en) * | 1981-11-09 | 1984-07-31 | Hilti Aktiengesellschaft | Percussion drill machine |
DE3335795A1 (en) * | 1983-10-01 | 1985-04-18 | Black & Decker Inc., Newark, Del. | DRILLING HAMMER |
DE3531641A1 (en) * | 1985-09-05 | 1987-03-05 | Hilti Ag | DRILL AND CHISEL HAMMER |
DE4135240A1 (en) * | 1991-10-25 | 1993-04-29 | Bosch Gmbh Robert | DRILLING HAMMER |
JP3424870B2 (en) * | 1995-02-28 | 2003-07-07 | 株式会社マキタ | Immersion prevention device for impact tools |
JPH11104974A (en) * | 1997-10-06 | 1999-04-20 | Makita Corp | Hammering tool |
GB9902793D0 (en) * | 1999-02-09 | 1999-03-31 | Black & Decker Inc | Rotary hammer |
GB9902789D0 (en) * | 1999-02-09 | 1999-03-31 | Black & Decker Inc | Rotary hammer |
DE19933972A1 (en) * | 1999-07-20 | 2001-01-25 | Bosch Gmbh Robert | Hammer drill or hammer |
DE19950759A1 (en) * | 1999-10-21 | 2001-04-26 | Bosch Gmbh Robert | Percussion drill has drive teeth connected to rotate with drill spindle and arranged in plane perpendicular to longitudinal axis and parallel to rotation axis of drive pinion |
JP4281273B2 (en) * | 2000-10-20 | 2009-06-17 | 日立工機株式会社 | Hammer drill |
GB0100605D0 (en) * | 2001-01-10 | 2001-02-21 | Black & Decker Inc | Hammer |
WO2003024671A2 (en) * | 2001-09-17 | 2003-03-27 | Milwaukee Electric Tool Corporation | Rotary hammer |
DE10157831B4 (en) * | 2001-11-24 | 2004-06-24 | Robert Bosch Gmbh | Hand-held machine tool with a die for receiving a tool |
DE10230991A1 (en) * | 2002-07-10 | 2004-02-12 | Robert Bosch Gmbh | Tool holder for a machine tool |
DE10240361A1 (en) * | 2002-09-02 | 2004-03-11 | Hilti Ag | Rotating and striking electric hand machine tool |
JP3976187B2 (en) * | 2002-11-20 | 2007-09-12 | 株式会社マキタ | Hammer drill |
DE102004047470A1 (en) * | 2004-09-30 | 2006-04-06 | Robert Bosch Gmbh | Hand tool, in particular drill and / or percussion hammer |
TWI279298B (en) * | 2004-11-24 | 2007-04-21 | Hitachi Koki Kk | Hammer drill |
DE102006054288A1 (en) * | 2006-11-17 | 2008-05-21 | A & M Electric Tools Gmbh | Rotary Hammer |
-
2008
- 2008-05-08 DE DE102008022454.5A patent/DE102008022454B4/en not_active Expired - Fee Related
-
2009
- 2009-04-28 EP EP09158888.9A patent/EP2116333B1/en not_active Not-in-force
- 2009-05-06 CN CN2009101365384A patent/CN101574803B/en not_active Expired - Fee Related
- 2009-05-07 US US12/437,019 patent/US20090277659A1/en not_active Abandoned
Also Published As
Publication number | Publication date |
---|---|
EP2116333A1 (en) | 2009-11-11 |
US20090277659A1 (en) | 2009-11-12 |
DE102008022454B4 (en) | 2014-06-26 |
CN101574803A (en) | 2009-11-11 |
DE102008022454A1 (en) | 2009-11-12 |
CN101574803B (en) | 2013-11-27 |
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