EP2842696A1 - Power tool - Google Patents

Power tool Download PDF

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Publication number
EP2842696A1
EP2842696A1 EP13182345.2A EP13182345A EP2842696A1 EP 2842696 A1 EP2842696 A1 EP 2842696A1 EP 13182345 A EP13182345 A EP 13182345A EP 2842696 A1 EP2842696 A1 EP 2842696A1
Authority
EP
European Patent Office
Prior art keywords
bounce
housing
beater
damper
discs
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP13182345.2A
Other languages
German (de)
French (fr)
Other versions
EP2842696B1 (en
Inventor
Markus Hartmann
Manfred Ludwig
Franz Mössnang
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
Priority to EP13182345.2A priority Critical patent/EP2842696B1/en
Priority to US14/473,187 priority patent/US9656378B2/en
Priority to CN201410437856.5A priority patent/CN104416188B/en
Publication of EP2842696A1 publication Critical patent/EP2842696A1/en
Application granted granted Critical
Publication of EP2842696B1 publication Critical patent/EP2842696B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • B25D11/04—Portable percussive tools with electromotor or other motor drive in which the tool bit or anvil is hit by an impulse member
    • 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
    • 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
    • B25D2211/06—Means for driving the impulse member
    • B25D2211/068—Crank-actuated impulse-driving mechanisms
    • 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
    • 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
    • B25D2250/345—Use of o-rings

Definitions

  • the present invention relates to a hand tool with a bounce damper.
  • the hand tool of the invention has a tool holder for receiving a tool on a working axis, a housing and a striking mechanism.
  • the Schlagtechnik has a motor-driven exciter, a racket, a pneumatic chamber between the pathogen and the racket, which couples the movement of the pathogen to the racket, and an intermediate racket.
  • a bounce stop is provided for the beater or the intermediate beater, wherein the bounce stop is movable in a direction parallel to the working axis, preferably the direction of impact, in the housing.
  • a bumper has two axially offset and radially overlapping arranged damper rings, based on polymer and two axially between the Dämpffringen, arranged discs, based on iron.
  • a first one of the damper rings is supported in the direction of the housing and a second of the damper rings is supported against the direction of the impact damper.
  • the first of the discs abuts in the direction of the first of the damper rings and is supported against the direction of the bounce stop.
  • the second of the discs bears against the direction on the second of the damper rings and is supported in the direction of the housing.
  • the structure of the bumper is compact and can still absorb very high loads.
  • the structure proves superior to a bounce damper with only one Dämpffring, either in terms of the necessary dimensions of Dämpfrings or one of the maximum load capacity.
  • Fig. 1 shows as an example of a drilling, chiselling hand tool machine schematically a hammer drill 1.
  • the hammer drill 1 has a tool holder 2, in which a shank end 3 of a tool, such as a drill or bit 4, can be used.
  • a primary drive of the hammer drill 1 is a motor 5, which drives a striking mechanism 6 and an output shaft 7 .
  • the motor 5 may be powered by a battery pack 8 .
  • a user can guide the hammer drill 1 by means of a handle 9 and be by means of a system switch 10 to the hammer drill 1 is in operation.
  • the hammer drill 1 rotates the drill 4 continuously about a working axis 11 and can beat the drill 4 in the direction of impact 12 along the working axis 11 in a substrate.
  • the striking mechanism 6 is, for example, a pneumatic percussion 6.
  • An exciter 13 and a racket 14 are movably guided in a guide tube 15 of the percussion mechanism 6 along the working axis 11 .
  • the exciter 13 is coupled via an eccentric 16 or a wobble finger to the motor 5 and forced to a periodic, linear movement.
  • An air spring formed by a pneumatic chamber 17 between exciter 13 and racket 14 couples a movement of the racket 14 to the movement of the exciter 13 at.
  • the beater 14 beats indirectly through a substantially stationary intermediate racquet 18 to the drill bit 4, to transfer a part of its momentum to the drill bit. 4
  • the striking mechanism 6 and preferably the further drive components are arranged within a machine housing 19 .
  • the intermediate beater 18 (striker) is arranged in a guide 20 , in which the intermediate beater 18 is guided coaxially to the working axis 11 movable.
  • a bounce stop 21 limits the movement in the direction of impact 12.
  • the bounce stop 21 has a bounce surface 22 which overlaps radially with the intermediate beater 18 .
  • the intermediate beater 18 comes with a radially projecting mating surface 23 on the bounce surface 22 in the direction of impact 12 for concern.
  • the bounce stop 21 is movably arranged together with the guide 20 within the housing 19 . When the intermediate beater 18 at a space against the Bounce stop 21 suggests the bounce stop 21 is moved relative to the housing 19 in the direction of impact 12 .
  • the bounce stop 21 is connected to the housing 19 by means of a bumper 24 .
  • the bumper 24 includes two Dämpfringe 25, 26.
  • the two Dämpfringe 25 26 are arranged coaxially to the working axis 11 and surround the bounce stop 21 and the guide 20.
  • the two Dämpffringe 25, 26 are made of a synthetic rubber, and can strike due to their elasticity.
  • the two Dämpfringe 25, 26 are along the working axis 11 offset from each other, but in the radial direction substantially at the same height.
  • the two Dämpfringe 25, 26 overlap in the radial direction, in the illustrated embodiment, the two Dämpfringe overlap 25, 26 completely.
  • the two Dämpfringe 25, 26 have approximately the same diameter, the diameters differ by less than their cord diameter.
  • the front damping ring 25 is supported in the direction of impact 12 on the housing 19 .
  • the front damping ring 25 bears in the direction of impact 12 against a collar 27 of a sleeve 28 .
  • the sleeve 28 is immovably applied in the direction of impact 12 relative to the housing 19 .
  • the rear damper ring 26 is against the impact direction 12 against a stop 29 of the bounce stop 21 .
  • the stop 29 may be integrally formed with the bounce stop 21 , or be connected by a snap ring, etc. with the bounce stop 21 .
  • the two discs 30, 31 are arranged between the two Dämpfringen 25, 26 two discs 30, 31 are arranged.
  • the two discs 30, 31 separate the two damper rings 25, 26 from each other.
  • the front disc 30 touches with its pointing in the direction of impact 12 side of the front Dämpfring 25.
  • the rear disc 31 touches with its counter to the direction of impact 12 side facing the rear Dämpfring 26.
  • the two discs 30, 31 do not touch each other.
  • the distance between the two disks 30, 31 is filled by an air gap 32 .
  • a coupling between the two discs 30, 31 is not provided.
  • the front disc 30 is supported against the impact direction 12 at the bounce stop 21 .
  • the exemplary front disc 30 abuts against the stop 29 .
  • the front disc 30 can not move counter to the direction of impact 12 with respect to the bounce stop 21 .
  • the front disc 30 is inhibited from approaching the rear disc against the direction of impact 12 .
  • the rear disc 31 lies in the direction of impact 12 is supported in the direction of impact 12 on the housing 19 . Consequently, the rear pulley 31 can not face in the direction of impact 12 move the housing 19 .
  • the rear disc 31 is inhibited from approaching in the direction of impact 12 of the front disc 30 .
  • the rear disc 31 is exemplified as a radially inwardly projecting collar of a sleeve 33 .
  • the rear damper ring 26 is in the direction of impact 12 on the collar, ergo the disc 31, and in the radial direction on the inside of the sleeve 33 at.
  • the sleeve 33 is located in the direction of impact 12 at a stage 34 of the housing 19 or the sleeve 28 at.
  • the front disc 30 is exemplified as a radially outwardly projecting collar of a sleeve 35 .
  • the front disc 30 bears against the direction of impact 12 at a stage 36 of the bounce stop 21 .
  • the axial distance of the two Dämpfringe 25, 26 is limited essentially to the discs 29, 30 and the air gap 32.
  • the axially compact design ensures that the bounce blow on a short path, and about the same length way in the Dämpfringe 25 flows.
  • the internal loads of the bumper 24 due to scattering of the bounce at seam / interfaces is thus kept low.
  • the forces are distributed to the two Dämpfringe 25, 26 .
  • the bounce blow is introduced into the housing 19 in part with the stop 29 of the bounce stop 21 via the rear damping ring 31 and the rear disk 31 .
  • Another part passes the stop 29 to the front disc 30, from which, starting from the other part of the bounce the front Dämpfring 25 passes and is introduced into the housing 19 .
  • the two Dämpfringe 25, 26 are loaded simultaneously, preferably with an equal force.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)

Abstract

Eine Handwerkzeugmaschine hat eine Werkzeugaufnahme (2) zum Aufnehmen eines Werkzeugs (4) auf einer Arbeitsachse (11), ein Gehäuse (19) und ein Schlagwerk (6). Ein Prellstopp (21) ist für den Schläger (14) oder den Zwischenschläger (18) vorgesehen, wobei der Prellstopp (21) in einer Richtung (12) parallel zu der Arbeitsachse (11) in dem Gehäuse (19) beweglich ist. Ein Prelldämpfer (24) hat zwei axial zueinander versetzt und radial überlappend angeordnete Dämpfringe (25, 26) auf Polymerbasis und zwei axial zwischen den Dämpfringen (25, 26) angeordnete Scheiben (30, 31 auf Eisenbasis. Ein erster der Dämpfringe (25) ist in der Richtung (12) an dem Gehäuse (19) und ein zweiter der Dämpfringe (26) entgegen der Richtung (12) an dem Prellstopp (21) abgestützt. Die erste der Scheiben (30) liegt in der Richtung (12) an dem ersten der Dämpfringe (25) an und ist entgegen der Richtung (12) an dem Prellstopp (21) abgestützt. Die zweite der Scheiben (31) liegt entgegen der Richtung (12) an dem zweiten der Dämpfringe (26) an und ist in der Richtung (12) an dem Gehäuse (19) abgestützt.A hand tool has a tool holder (2) for receiving a tool (4) on a working axis (11), a housing (19) and a striking mechanism (6). A bounce stop (21) is provided for the beater (14) or the intermediate beater (18), the bounce stop (21) being movable in a direction (12) parallel to the working axis (11) in the housing (19). A bounce damper (24) has two polymer-based damper rings (25, 26) axially offset from each other and radially overlapping, and two iron-based discs (30, 31) axially disposed between the damper rings (25, 26) in the direction (12) on the housing (19) and a second of the damper rings (26) against the direction (12) supported on the bounce stop (21) The first of the discs (30) lies in the direction (12) on the The second of the discs (31) bears against the direction (12) against the second of the damper rings (26) and is in the first position of the damper rings (25) and is supported against the bounce stop (21) Direction (12) supported on the housing (19).

Description

GEBIET DER ERFINDUNGFIELD OF THE INVENTION

Die vorliegende Erfindung betrifft eine Handwerkzeugmaschine mit einem Prelldämpfer.The present invention relates to a hand tool with a bounce damper.

OFFENBARUNG DER ERFINDUNGDISCLOSURE OF THE INVENTION

Die erfindungsgemäße Handwerkzeugmaschine hat eine Werkzeugaufnahme zum Aufnehmen eines Werkzeugs auf einer Arbeitsachse, ein Gehäuse und ein Schlagwerk. Das Schlagwerk hat einen motorgetriebenen Erreger, einen Schläger, eine pneumatische Kammer zwischen Erreger und Schläger, welche die Bewegung des Erregers an den Schläger ankoppelt, und einen Zwischenschläger. Ein Prellstopp ist für den Schläger oder den Zwischenschläger vorgesehen, wobei der Prellstopp in einer Richtung parallel zu der Arbeitsachse, vorzugsweise der Schlagrichtung, in dem Gehäuse beweglich ist. Ein Prelldämpfer hat zwei axial zueinander versetzt und radial überlappend angeordnete Dämpfringe, auf Polymerbasis und zwei axial zwischen den Dämpfringen, angeordnete Scheiben, auf Eisenbasis. Ein erster der Dämpfringe ist in der Richtung an dem Gehäuse und ein zweiter der Dämpfringe entgegen der Richtung an dem Prelldämpfer abgestützt. Die erste der Scheiben liegt in der Richtung an dem ersten der Dämpfringe an und ist entgegen der Richtung an dem Prellstopp abgestützt. Die zweite der Scheiben liegt entgegen der Richtung an dem zweiten der Dämpfringe an und ist in der Richtung an dem Gehäuse abgestützt.The hand tool of the invention has a tool holder for receiving a tool on a working axis, a housing and a striking mechanism. The Schlagwerk has a motor-driven exciter, a racket, a pneumatic chamber between the pathogen and the racket, which couples the movement of the pathogen to the racket, and an intermediate racket. A bounce stop is provided for the beater or the intermediate beater, wherein the bounce stop is movable in a direction parallel to the working axis, preferably the direction of impact, in the housing. A bumper has two axially offset and radially overlapping arranged damper rings, based on polymer and two axially between the Dämpffringen, arranged discs, based on iron. A first one of the damper rings is supported in the direction of the housing and a second of the damper rings is supported against the direction of the impact damper. The first of the discs abuts in the direction of the first of the damper rings and is supported against the direction of the bounce stop. The second of the discs bears against the direction on the second of the damper rings and is supported in the direction of the housing.

Der Aufbau des Prelldämpfers ist kompakt und kann dennoch sehr hohe Belastungen dämpfen. Insbesondere erweist sich der Aufbau überlegen gegenüber einem Prelldämpfer mit nur einem Dämpfring, entweder hinsichtlich der notwendigen Abmessungen des Dämpfrings oder einer der maximalen Belastbarkeit.The structure of the bumper is compact and can still absorb very high loads. In particular, the structure proves superior to a bounce damper with only one Dämpffring, either in terms of the necessary dimensions of Dämpfrings or one of the maximum load capacity.

KURZE BESCHREIBUNG DER FIGURENBRIEF DESCRIPTION OF THE FIGURES

Die nachfolgende Beschreibung erläutert die Erfindung anhand von exemplarischen Ausführungsformen und Figuren. In den Figuren zeigen:

  • Fig. 1 einen Bohrhammer
  • Fig. 2 einen Ausschnitt des Bohrhammers
The following description explains the invention with reference to exemplary embodiments and figures. In the figures show:
  • Fig. 1 a hammer drill
  • Fig. 2 a section of the hammer drill

Gleiche oder funktionsgleiche Elemente werden durch gleiche Bezugszeichen in den Figuren indiziert, soweit nicht anders angegeben.Identical or functionally identical elements are indicated by the same reference numerals in the figures, unless stated otherwise.

AUSFÜHRUNGSFORMEN DER ERFINDUNGEMBODIMENTS OF THE INVENTION

Fig. 1 zeigt als Beispiel einer bohrenden, meißelnden Handwerkzeugmaschine schematisch einen Bohrhammer 1. Der Bohrhammer 1 hat eine Werkzeugaufnahme 2, in welche ein Schaftende 3 eines Werkzeug, z.B. eines Bohrers oder Meißels 4, eingesetzt werden kann. Einen primären Antrieb des Bohrhammers 1 bildet ein Motor 5, welcher ein Schlagwerk 6 und eine Abtriebswelle 7 antreibt. Der Motor 5 kann von einem Batteriepaket 8 gespeist sein. Ein Anwender kann den Bohrhammer 1 mittels eines Handgriffs 9 führen und mittels eines Systemschalters 10 den Bohrhammer 1 in Betrieb nehmen. Im Betrieb dreht der Bohrhammer 1 den Bohrer 4 kontinuierlich um eine Arbeitsachse 11 und kann dabei den Bohrer 4 in Schlagrichtung 12 längs der Arbeitsachse 11 in einen Untergrund schlagen. Fig. 1 shows as an example of a drilling, chiselling hand tool machine schematically a hammer drill 1. The hammer drill 1 has a tool holder 2, in which a shank end 3 of a tool, such as a drill or bit 4, can be used. A primary drive of the hammer drill 1 is a motor 5, which drives a striking mechanism 6 and an output shaft 7 . The motor 5 may be powered by a battery pack 8 . A user can guide the hammer drill 1 by means of a handle 9 and be by means of a system switch 10 to the hammer drill 1 is in operation. In operation, the hammer drill 1 rotates the drill 4 continuously about a working axis 11 and can beat the drill 4 in the direction of impact 12 along the working axis 11 in a substrate.

Das Schlagwerk 6 ist beispielsweise ein pneumatisches Schlagwerk 6. Ein Erreger 13 und ein Schläger 14 sind in einem Führungsrohr 15 des Schlagwerks 6 längs der Arbeitsachse 11 beweglich geführt. Der Erreger 13 ist über einen Exzenter 16 oder einen Taumelfinger an den Motor 5 angekoppelt und zu einer periodischen, linearen Bewegung gezwungen. Eine Luftfeder gebildet durch eine pneumatische Kammer 17 zwischen Erreger 13 und Schläger 14 koppelt eine Bewegung des Schlägers 14 an die Bewegung des Erregers 13 an. Der Schläger 14 schlägt mittelbar über einen im Wesentlichen ruhenden Zwischenschläger 18 auf den Bohrer 4, um einen Teil seines Impulses auf den Bohrer 4 zu übertragen. Das Schlagwerk 6 und vorzugsweise die weiteren Antriebskomponenten sind innerhalb eines Maschinengehäuses 19 angeordnet.The striking mechanism 6 is, for example, a pneumatic percussion 6. An exciter 13 and a racket 14 are movably guided in a guide tube 15 of the percussion mechanism 6 along the working axis 11 . The exciter 13 is coupled via an eccentric 16 or a wobble finger to the motor 5 and forced to a periodic, linear movement. An air spring formed by a pneumatic chamber 17 between exciter 13 and racket 14 couples a movement of the racket 14 to the movement of the exciter 13 at. The beater 14 beats indirectly through a substantially stationary intermediate racquet 18 to the drill bit 4, to transfer a part of its momentum to the drill bit. 4 The striking mechanism 6 and preferably the further drive components are arranged within a machine housing 19 .

Der Zwischenschläger 18 (Döpper) ist in einer Führung 20 angeordnet, in welcher der Zwischenschläger 18 koaxial zu der Arbeitsachse 11 beweglich geführt ist. Ein Prellstopp 21 begrenzt die Bewegung in Schlagrichtung 12. Der Prellstopp 21 hat eine Prellfläche 22, welche radial mit dem Zwischenschläger 18 überlappt. Der Zwischenschläger 18 kommt mit einer radial vorstehenden Gegenfläche 23 an der Prellfläche 22 in Schlagrichtung 12 zum Anliegen. Der Prellstopp 21 ist zusammen mit der Führung 20 innerhalb des Gehäuse 19 beweglich angeordnet. Wenn der Zwischenschläger 18 bei einem Leerschlag gegen den Prellstopp 21 schlägt, wird der Prellstopp 21 gegenüber dem Gehäuse 19 in Schlagrichtung 12 verschoben.The intermediate beater 18 (striker) is arranged in a guide 20 , in which the intermediate beater 18 is guided coaxially to the working axis 11 movable. A bounce stop 21 limits the movement in the direction of impact 12. The bounce stop 21 has a bounce surface 22 which overlaps radially with the intermediate beater 18 . The intermediate beater 18 comes with a radially projecting mating surface 23 on the bounce surface 22 in the direction of impact 12 for concern. The bounce stop 21 is movably arranged together with the guide 20 within the housing 19 . When the intermediate beater 18 at a space against the Bounce stop 21 suggests the bounce stop 21 is moved relative to the housing 19 in the direction of impact 12 .

Der Prellstopp 21 ist mittels eines Prelldämpfers 24 an das Gehäuse 19 angebunden. Der Prelldämpfer 24 enthält zwei Dämpfringe 25, 26. Die beiden Dämpfringe 25 26 sind koaxial zu der Arbeitsachse 11 angeordnet und umgeben den Prellstopp 21 bzw. die Führung 20. Die beiden Dämpfringe 25, 26 sind aus einem synthetischen Kautschuk hergestellt, und können einen Schlag aufgrund ihrer Elastizität dämpfen. Die beiden Dämpfringe 25, 26 sind längs der Arbeitsachse 11 versetzt zueinander angeordnet, aber in radialer Richtung im Wesentlichen auf gleicher Höhe. Die beiden Dämpfringe 25, 26 überlappen in radialer Richtung, in der dargestellten Ausführungsform überlappen die beiden Dämpfringe 25, 26 vollständig. Die beiden Dämpfringe 25, 26 haben entsprechend näherungsweise den gleichen Durchmesser, deren Durchmesser unterscheiden sich um weniger als deren Schnurdurchmesser.The bounce stop 21 is connected to the housing 19 by means of a bumper 24 . The bumper 24 includes two Dämpfringe 25, 26. The two Dämpfringe 25 26 are arranged coaxially to the working axis 11 and surround the bounce stop 21 and the guide 20. The two Dämpffringe 25, 26 are made of a synthetic rubber, and can strike due to their elasticity. The two Dämpfringe 25, 26 are along the working axis 11 offset from each other, but in the radial direction substantially at the same height. The two Dämpfringe 25, 26 overlap in the radial direction, in the illustrated embodiment, the two Dämpfringe overlap 25, 26 completely. The two Dämpfringe 25, 26 have approximately the same diameter, the diameters differ by less than their cord diameter.

Der vordere Dämpfring 25 ist in Schlagrichtung 12 an dem Gehäuse 19 abgestützt. Bei der beispielhaft dargestellten Ausführung liegt der vordere Dämpfring 25 in Schlagrichtung 12 an einem Kragen 27 einer Hülse 28 an. Die Hülse 28 ist in Schlagrichtung 12 gegenüber dem Gehäuse 19 unbeweglich angelegt. Der hintere Dämpfring 26 liegt entgegen der Schlagrichtung 12 an einem Anschlag 29 des Prellstopps 21 an. Der Anschlag 29 kann einteilig mit dem Prellstopp 21 gebildet sein, oder durch einen Sprengring etc. mit dem Prellstopp 21 verbunden sein.The front damping ring 25 is supported in the direction of impact 12 on the housing 19 . In the embodiment shown by way of example, the front damping ring 25 bears in the direction of impact 12 against a collar 27 of a sleeve 28 . The sleeve 28 is immovably applied in the direction of impact 12 relative to the housing 19 . The rear damper ring 26 is against the impact direction 12 against a stop 29 of the bounce stop 21 . The stop 29 may be integrally formed with the bounce stop 21 , or be connected by a snap ring, etc. with the bounce stop 21 .

Zwischen den beiden Dämpfringen 25, 26 sind zwei Scheiben 30, 31 angeordnet. Die beiden Scheiben 30, 31 trennen die beiden Dämpfringen 25, 26 voneinander. Die vordere Scheibe 30 berührt mit ihrer in Schlagrichtung 12 weisenden Seite den vorderen Dämpfring 25. Die hintere Scheibe 31 berührt mit ihrer entgegen der Schlagrichtung 12 weisenden Seite den hinteren Dämpfring 26. Die beiden Scheiben 30, 31 berühren einander nicht. Der Abstand zwischen den beiden Scheiben 30, 31 ist von einem Luftspalt 32 ausgefüllt. Eine Kopplung zwischen den beiden Scheiben 30, 31 ist nicht vorgesehen. Die vordere Scheibe 30 ist entgegen der Schlagrichtung 12 an dem Prellstopp 21 abgestützt. Die beispielhafte vordere Scheibe 30 liegt an dem Anschlag 29 an. Die vordere Scheibe 30 kann sich nicht entgegen der Schlagrichtung 12 gegenüber dem Prellstopp 21 bewegen. Die vordere Scheibe 30 ist gehemmt sich der hinteren Scheibe entgegen der Schlagrichtung 12 zu nähern. Die hintere Scheibe 31 liegt in Schlagrichtung 12 ist in Schlagrichtung 12 an dem Gehäuse 19 abgestützt. Folglich kann die hintere Scheibe 31 sich nicht in Schlagrichtung 12 gegenüber dem Gehäuse 19 verschieben. Die hintere Scheibe 31 ist gehemmt, sich in Schlagrichtung 12 der vorderen Scheibe 30 zu nähern.Between the two Dämpfringen 25, 26 two discs 30, 31 are arranged. The two discs 30, 31 separate the two damper rings 25, 26 from each other. The front disc 30 touches with its pointing in the direction of impact 12 side of the front Dämpfring 25. The rear disc 31 touches with its counter to the direction of impact 12 side facing the rear Dämpfring 26. The two discs 30, 31 do not touch each other. The distance between the two disks 30, 31 is filled by an air gap 32 . A coupling between the two discs 30, 31 is not provided. The front disc 30 is supported against the impact direction 12 at the bounce stop 21 . The exemplary front disc 30 abuts against the stop 29 . The front disc 30 can not move counter to the direction of impact 12 with respect to the bounce stop 21 . The front disc 30 is inhibited from approaching the rear disc against the direction of impact 12 . The rear disc 31 lies in the direction of impact 12 is supported in the direction of impact 12 on the housing 19 . Consequently, the rear pulley 31 can not face in the direction of impact 12 move the housing 19 . The rear disc 31 is inhibited from approaching in the direction of impact 12 of the front disc 30 .

Die hintere Scheibe 31 ist beispielhaft als ein radial nach Innen vorstehender Kragen einer Hülse 33 gebildet. Der hintere Dämpfring 26 liegt in Schlagrichtung 12 an dem Kragen, ergo der Scheibe 31, und in radialer Richtung an der Innenseite der Hülse 33 an. Die Hülse 33 liegt in Schlagrichtung 12 an einer Stufe 34 des Gehäuses 19 oder der Hülse 28 an. Die vordere Scheibe 30 ist beispielhaft als ein radial nach außen vorstehender Kragen einer Hülse 35 gebildet. Die vordere Scheibe 30 liegt entgegen der Schlagrichtung 12 an einer Stufe 36 des Prellstopps 21 an.The rear disc 31 is exemplified as a radially inwardly projecting collar of a sleeve 33 . The rear damper ring 26 is in the direction of impact 12 on the collar, ergo the disc 31, and in the radial direction on the inside of the sleeve 33 at. The sleeve 33 is located in the direction of impact 12 at a stage 34 of the housing 19 or the sleeve 28 at. The front disc 30 is exemplified as a radially outwardly projecting collar of a sleeve 35 . The front disc 30 bears against the direction of impact 12 at a stage 36 of the bounce stop 21 .

Der axiale Abstand der beiden Dämpfringe 25, 26 beschränkt sich im Wesentlichen auf die Scheiben 29, 30 und den Luftspalt 32. Der axial kompakte Aufbau stellt sicher, dass der Prellschlag auf kurzem Weg, und etwa gleich langem Weg in die Dämpfringe 25 fließt. Insbesondere ist es vorteilhaft, dass der Prellschlag maximal einen Scheibe 30 zwischen Prellstopp 21 und Dämpfring 25 traversieren muss. Die internen Belastungen des Prelldämpfers 24 aufgrund von Streuungen des Prellschlags an Naht- / Grenzflächen wird somit gering gehalten.The axial distance of the two Dämpfringe 25, 26 is limited essentially to the discs 29, 30 and the air gap 32. The axially compact design ensures that the bounce blow on a short path, and about the same length way in the Dämpfringe 25 flows. In particular, it is advantageous for the bounce impact to have to traverse a maximum of one disc 30 between bounce stop 21 and damping ring 25 . The internal loads of the bumper 24 due to scattering of the bounce at seam / interfaces is thus kept low.

Bei einem Prellschlag des Zwischenschlägers 18 in den Prellstopp 21 werden die auftretenden Kräfte auf die beiden Dämpfringe 25, 26 verteilt. Der Prellschlag wird zu einem Teil mit dem Anschlag 29 des Prellstopps 21 über den hinteren Dämpfring 31 und die hintere Scheibe 31 in das Gehäuse 19 eingeleitet. Einen anderen Teil übergibt der Anschlag 29 an die vordere Scheibe 30, von welcher ausgehend der andere Teil des Prellschlags den vorderen Dämpfring 25 durchläuft und in das Gehäuse 19 eingeleitet wird. Die beiden Dämpfringe 25, 26 sind gleichzeitig belastet, vorzugsweise mit einer gleich großen Kraft.In a bounce of the intermediate beater 18 in the bounce stop 21 , the forces are distributed to the two Dämpfringe 25, 26 . The bounce blow is introduced into the housing 19 in part with the stop 29 of the bounce stop 21 via the rear damping ring 31 and the rear disk 31 . Another part passes the stop 29 to the front disc 30, from which, starting from the other part of the bounce the front Dämpfring 25 passes and is introduced into the housing 19 . The two Dämpfringe 25, 26 are loaded simultaneously, preferably with an equal force.

Claims (5)

Handwerkzeugmaschine mit
einer Werkzeugaufnahme (2) zum Aufnehmen eines Werkzeugs (4) auf einer Arbeitsachse (11),
einem Gehäuse (19),
einem Schlagwerk (6), das einen motorgetriebenen Erreger (13), einen Schläger (14), eine pneumatische Kammer (17) zwischen Erreger (13) und Schläger (14), welche die Bewegung des Erregers (13) an den Schläger (14) ankoppelt, und einen Zwischenschläger (18) aufweist,
einem Prellstopp (21) für den Schläger (14) oder den Zwischenschläger (18), wobei der Prellstopp (21) in einer Richtung (12) parallel zu der Arbeitsachse (11) in dem Gehäuse (19) beweglich ist,
einem Prelldämpfer (24), der zwei axial zueinander versetzt und radial überlappend angeordnete Dämpfringe (25, 26) auf Polymerbasis und zwei axial zwischen den Dämpfringen (25, 26) angeordnete Scheiben (30, 31) auf Eisenbasis aufweist, wobei ein erster der Dämpfringe (25) in der Richtung (12) an dem Gehäuse (19) und ein zweiter der Dämpfringe (26) entgegen der Richtung (12) an dem Prelldämpfer (24) abgestützt ist, wobei die erste der Scheiben (30) in der Richtung (12) an dem ersten der Dämpfringe (25) anliegt und entgegen der Richtung (12) an dem Prellstopp (21) abgestützt ist und die zweite der Scheiben (31) entgegen der Richtung (12) an dem zweiten der Dämpfringe (26) anliegt und in der Richtung (12) an dem Gehäuse (19) abgestützt ist.Hand tool with
a tool holder (2) for receiving a tool (4) on a working axis (11),
a housing (19),
a percussion mechanism (6) comprising a motor-driven exciter (13), a beater (14), a pneumatic chamber (17) between exciter (13) and beater (14), which controls the movement of the exciter (13) to the beater (14 ), and has an intermediate beater (18),
a bounce stop (21) for the beater (14) or the intermediate beater (18), the bounce stop (21) being movable in a direction (12) parallel to the working axis (11) in the housing (19),
a bounce damper (24) comprising two polymer-based damper rings (25, 26) axially offset from each other and radially overlapping, and two iron-based discs (30, 31) axially disposed between the damper rings (25, 26), a first one of the damper rings (25) in the direction (12) on the housing (19) and a second of the damping rings (26) against the direction (12) on the bounce damper (24) is supported, wherein the first of the discs (30) in the direction ( 12) bears against the first of the damping rings (25) and is supported against the direction (12) at the bounce stop (21) and the second of the discs (31) bears against the direction (12) against the second of the damping rings (26) and in the direction (12) on the housing (19) is supported. Handwerkzeugmaschine nach Anspruch 1, dadurch gekennzeichnet, dass die Dämpfringe (25, 26) identisch ausgebildet sind.Powered hand tool according to claim 1, characterized in that the Dämpfringe (25, 26) are identical. Handwerkzeugmaschine nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass ein Luftspalt (32) längs der Arbeitsachse (11) die beiden Scheiben (30, 31) separiert.Powered hand tool according to claim 1 or 2, characterized in that an air gap (32) along the working axis (11), the two discs (30, 31) separated. Handwerkzeugmaschine nach Anspruch 3, dadurch gekennzeichnet, dass die zweite Scheibe (31) durch einen radial nach Innen vorstehenden Kragen einer Hülse (33) gebildet ist.Powered hand tool according to claim 3, characterized in that the second disc (31) by a radially inwardly projecting collar of a sleeve (33) is formed. Handwerkzeugmaschine nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Zwischenschläger (22) in der Richtung (12) nach dem Schläger (14) angeordnet ist.Powered hand tool according to one of the preceding claims, characterized in that the intermediate beater (22) in the direction (12) after the racket (14) is arranged.
EP13182345.2A 2013-08-30 2013-08-30 Power tool Active EP2842696B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP13182345.2A EP2842696B1 (en) 2013-08-30 2013-08-30 Power tool
US14/473,187 US9656378B2 (en) 2013-08-30 2014-08-29 Machine tool
CN201410437856.5A CN104416188B (en) 2013-08-30 2014-08-29 Handheld machine tool

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13182345.2A EP2842696B1 (en) 2013-08-30 2013-08-30 Power tool

Publications (2)

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EP2842696A1 true EP2842696A1 (en) 2015-03-04
EP2842696B1 EP2842696B1 (en) 2016-06-01

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JP7236921B2 (en) * 2019-04-18 2023-03-10 株式会社マキタ impact tool
CN112427967B (en) * 2019-08-26 2022-11-11 南京泉峰科技有限公司 Electric tool
EP3822037A1 (en) * 2019-11-15 2021-05-19 Hilti Aktiengesellschaft Impact device assembly

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US5379848A (en) * 1991-10-25 1995-01-10 Robert Bosch Gmbh Drill hammer
EP0663270A1 (en) * 1994-01-13 1995-07-19 Friedrich Duss Maschinenfabrik Gmbh & Co. Impact hammer with rotative and/or percussive action
JP2005040880A (en) * 2003-07-25 2005-02-17 Hitachi Koki Co Ltd Hammering tool and idling prevention mechanism for the tool
EP1602451A2 (en) * 2004-06-05 2005-12-07 BLACK & DECKER INC. Rotary spindle for power tool and power tool incorporating such spindle
EP2199030A1 (en) * 2008-12-19 2010-06-23 Makita Corporation Impact tool

Also Published As

Publication number Publication date
US20150060099A1 (en) 2015-03-05
CN104416188A (en) 2015-03-18
EP2842696B1 (en) 2016-06-01
US9656378B2 (en) 2017-05-23
CN104416188B (en) 2017-04-12

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