EP1431005B1 - Percussion electric hand tool - Google Patents

Percussion electric hand tool Download PDF

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Publication number
EP1431005B1
EP1431005B1 EP03104752A EP03104752A EP1431005B1 EP 1431005 B1 EP1431005 B1 EP 1431005B1 EP 03104752 A EP03104752 A EP 03104752A EP 03104752 A EP03104752 A EP 03104752A EP 1431005 B1 EP1431005 B1 EP 1431005B1
Authority
EP
European Patent Office
Prior art keywords
percussion
motor
electric hand
axis
power tool
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP03104752A
Other languages
German (de)
French (fr)
Other versions
EP1431005A2 (en
EP1431005A3 (en
Inventor
Holger Cecchin
Christian Daubner
Hubert Daxenberger
David Hruza
Christoph Josef Kink
Ferdinand Kristen
Erwin Manschitz
Hans-Jürgen Horst Georg Pfisterer
Walter Wissmach
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hilti AG
Original Assignee
Hilti AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hilti AG filed Critical Hilti AG
Publication of EP1431005A2 publication Critical patent/EP1431005A2/en
Publication of EP1431005A3 publication Critical patent/EP1431005A3/en
Application granted granted Critical
Publication of EP1431005B1 publication Critical patent/EP1431005B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B25D11/06—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
    • B25D2211/00—Details of portable percussive tools with electromotor or other motor drive
    • B25D2211/003—Crossed drill and motor spindles

Definitions

  • the invention refers to an electric hand-held power tool, such as a combi-hammer or chisel hammer, at least partially hitting the preamble of claim 1 and as shown in FIG DE 736 794 known.
  • a tool striking driving electric hand tool machines have by interacting with the workpiece and the hand-arm system of the user as well as the internal masses and stiffness distribution on a complex self-excitation, the resulting self-vibration is to suppress as much as possible, especially in the handle area.
  • the technical effort in this passive passive damping or actively controlled vibration suppression increases with the complexity of self-excitation to be compensated.
  • a chisel hammer has a reluctance motor mounted cantilevered on its rotor axis, which is extended directly to the eccentric of the percussion unit, and is therefore arranged completely on one side of the striking axis.
  • the mass center of gravity thus offset from the striking axis to the reluctance motor leads to bending moments through the interaction with the workpiece and the hand-arm system of the user and finally to complex, non-axial vibrations.
  • a reluctance motor connected directly to the eccentric is necessarily slow rotating, which has a high mass / power ratio for reluctance motors.
  • a chisel hammer with a striking mechanism assembly has a mass distribution that is substantially symmetrical radially with respect to the striking axis, in that the striking mechanism transmission is arranged to be a part of the motor diametrically with respect to the striking axis.
  • the space requirement of the engine in the core area of the striking axis requires a constructive large axial distance to the eccentric, whereby bending moments are excited.
  • the object of the invention consists in the realization of an at least partially striking electric hand tool with largely analytically simple excitation.
  • an electric hand tool machine which strikes at least partially along a striking axis has an electric motor with a rotor shaft arranged transversely to the striking axis with a rotor laminated core and a motor pinion which meshes a striking mechanism assembly with an eccentric via a percussion gear mechanism, the rotor laminated core being completely diametrically opposed to the percussion gear mechanism with respect to the striking axis is arranged.
  • the rotor shaft is arranged directly adjacent to a crankshaft of the eccentric by an eccentric pinion meshes as part of the percussion gear directly with the motor pinion on the rotor shaft, whereby their distance is determined only by both pinion radii.
  • the eccentric pinion is designed as an outer pinion of the crankshaft or alternatively as an inner pinion of a hollow crankshaft, whereby the distance is determined by the sum or the difference of the pinion radii.
  • the storage of the electric motor via the rotor shaft at two bearings in the percussion gear further advantageously in a gear housing and in a bearing cap, optionally made of lightweight die-cast aluminum, whereby a precise guidance of the meshing engine pinion is achieved.
  • the rotor laminated core is freely cantilevered, whereby a mass-afflicted sheet-metal bearing side bearing is eliminated, whereby the engine center of gravity is moved closer to the impact axis.
  • a massearmes fan is arranged on the axis distant, BlechchUnfuren front end of the rotor shaft, whereby no axle near installation space is claimed.
  • the structural design of a motor housing is also simplified by the lack of bearing.
  • the electric motor as a brushless motor, further advantageously designed as a reluctance motor, whereby a high power / mass ratio can be realized.
  • the striking mechanism assembly and the electric motor have a common center of gravity on the striking axis, as a result of which analytically simpler excitations occur.
  • an electric hand-held power tool 1 striking along a striking axis A has an electric motor 2 designed as a reluctance motor with a rotor shaft 3 arranged transversely to the striking axis A with a rotor laminated core 4 and a motor pinion 5.
  • a striking mechanism 6 with an eccentric 7 is driven by a percussion gear 8 meshing of the motor pinion 4.
  • the rotor laminated core 4 is arranged completely diametrically with respect to the percussion gear 8 with respect to the striking axis A.
  • the rotor shaft 3 is arranged directly adjacent to a crankshaft 9 of the eccentric 7, in that an outer eccentric pinion 10 meshes directly with the motor pinion 5 on the rotor shaft 3 as part of the percussion gearbox 8.
  • the rotor shaft 3 is formed with the rotor laminated core 4 cantilevered and at the axis distant, sheet metal packet side front end of the rotor shaft 3 is a massearmes fan 14 is arranged.
  • the percussion gear 8 is arranged at 90% with respect to the striking axis A diametrically to the electric motor 2, whereby the common center of gravity S of the Schlagtechniksbaugruppr 6 and the electric motor 2 is located on the striking axis A.

Description

Die Erfindung bezeichnet eine zumindest teilweise schlagende Elektrohandwerkzeugmaschine wie einen Kombihammer oder Meisselhammer nach dem Oberbegriff von Anspruch 1 und wie aus der DE 736 794 bekannt.The invention refers to an electric hand-held power tool, such as a combi-hammer or chisel hammer, at least partially hitting the preamble of claim 1 and as shown in FIG DE 736 794 known.

Ein Werkzeug schlagend antreibende Elektrohandwerkzeugmaschinen weisen durch die Wechselwirkung mit dem Werkstück und dem Hand-Arm-System des Nutzers sowie der internen Massen und Steifigkeitsverteilung eine komplexe Eigenerregung auf, deren resultierende Eigenvibration insbesondere im Handgriffbereich weitestgehend zu unterdrücken ist. Der technische Aufwand diesbezüglicher passiv dämpfenden oder aktiv geregelten Vibrationsunterdrückungen steigt mit der Komplexität der zu kompensierenden Eigenerregung.A tool striking driving electric hand tool machines have by interacting with the workpiece and the hand-arm system of the user as well as the internal masses and stiffness distribution on a complex self-excitation, the resulting self-vibration is to suppress as much as possible, especially in the handle area. The technical effort in this passive passive damping or actively controlled vibration suppression increases with the complexity of self-excitation to be compensated.

Nach der EP0107628 weist ein Meisselhammer einen an seiner, unmittelbar zum Exzenter der Schlagwerksbaugruppe verlängerten, Rotorachse frei auskragend gelagerten Reluktanzmotor auf, der somit vollständig einseitig der Schlagachse angeordnet ist. Der somit von der Schlagachse zum Reluktanzmotor versetzte Massenschwerpunkt führt durch die Wechselwirkung mit dem Werkstück und dem Hand-Arm-System des Nutzers zu Biegemomenten und diese schliesslich zu komplexen, nicht axialen Vibrationen. Zudem ist ein direkt mit dem Exzenter verbundener Reluktanzmotor notwendig langsam rotierend, wodurch dieser ein für Reluktanzmotoren hohes Masse / Leistungs-Verhältnis aufweist.After EP0107628 For example, a chisel hammer has a reluctance motor mounted cantilevered on its rotor axis, which is extended directly to the eccentric of the percussion unit, and is therefore arranged completely on one side of the striking axis. The mass center of gravity thus offset from the striking axis to the reluctance motor leads to bending moments through the interaction with the workpiece and the hand-arm system of the user and finally to complex, non-axial vibrations. In addition, a reluctance motor connected directly to the eccentric is necessarily slow rotating, which has a high mass / power ratio for reluctance motors.

Nach der EP1238759 weist ein Meisselhammer mit einer Schlagwerksbaugruppe eine radial zur Schlagachse weitgehend symmetrische Masseverteilung auf, indem das Schlagwerksgetriebe zu einem Teil des Motors diametral bezüglich der Schlagachse angeordnet ist. Der Raumbedarf des Motors im Kernbereich der Schlagachse bedingt konstruktiv einen grossen axialen Abstand zum Exzenter, wodurch Biegemomente erregt werden.After EP1238759 For example, a chisel hammer with a striking mechanism assembly has a mass distribution that is substantially symmetrical radially with respect to the striking axis, in that the striking mechanism transmission is arranged to be a part of the motor diametrically with respect to the striking axis. The space requirement of the engine in the core area of the striking axis requires a constructive large axial distance to the eccentric, whereby bending moments are excited.

Die Aufgabe der Erfindung besteht in der Realisierung einer zumindest teilweise schlagenden Elektrohandwerkzeugmaschine mit weitgehend analytisch einfacher Erregung.The object of the invention consists in the realization of an at least partially striking electric hand tool with largely analytically simple excitation.

Die Aufgabe wird durch die Merkmale des unabhängigen Anspruchs 1 gelöst. Vorteilhafte Weiterbildungen ergeben sich aus den Unteransprüchen.The object is solved by the features of independent claim 1. Advantageous developments emerge from the subclaims.

Im Wesentlichen weist eine zumindest teilweise längs einer Schlagachse schlagende Elektrohandwerkzeugmaschine einen Elektromotor mit einer quer zur Schlagachse angeordneten Rotorwelle mit einem Rotorblechpaket und einem Motorritzel auf, welche eine Schlagwerksbaugruppe mit einem Exzenter über ein Schlagwerksgetriebe kämmend antreibt, wobei das Rotorblechpaket bezüglich der Schlagachse vollständig diametral zum Schlagwerksgetriebe angeordnet ist.Essentially, an electric hand tool machine which strikes at least partially along a striking axis has an electric motor with a rotor shaft arranged transversely to the striking axis with a rotor laminated core and a motor pinion which meshes a striking mechanism assembly with an eccentric via a percussion gear mechanism, the rotor laminated core being completely diametrically opposed to the percussion gear mechanism with respect to the striking axis is arranged.

Durch das vollständig diametral zum Schlagwerksgetriebe angeordnete Rotorblechpaket wird der Kernbereich der Schlagachse nur von der Rotorwelle durchsetzt, wodurch neben einer radial zur Schlagachse weitgehend symmetrischen Masseverteilung der Elektromotor nahe am Exzenter angeordnet ist und somit weniger Biegemomente erregt werden.By completely arranged diametrically to the percussion gear rotor core stack of the core portion of the striking axis is penetrated only by the rotor shaft, which in addition to a radial axis largely flat to the impact axis distribution of the electric motor is arranged close to the eccentric and thus less bending moments are excited.

Vorteilhaft ist die Rotorwelle unmittelbar benachbart zu einer Kurbelwelle des Exzenters angeordnet, indem ein Exzenterritzel als Teil des Schlagwerksgetriebes direkt mit dem Motorritzel auf der Rotorwelle kämmt, wodurch deren Abstand nur durch beide Ritzelradien bestimmt wird.Advantageously, the rotor shaft is arranged directly adjacent to a crankshaft of the eccentric by an eccentric pinion meshes as part of the percussion gear directly with the motor pinion on the rotor shaft, whereby their distance is determined only by both pinion radii.

Vorteilhaft ist das Exzenterritzel als Aussenritzel der Kurbelwelle oder alternativ als Innenritzel einer hohlen Kurbelwelle ausgebildet, wodurch der Abstand durch die Summe bzw. die Differenz der Ritzelradien bestimmt wird.Advantageously, the eccentric pinion is designed as an outer pinion of the crankshaft or alternatively as an inner pinion of a hollow crankshaft, whereby the distance is determined by the sum or the difference of the pinion radii.

Vorteilhaft erfolgt die Lagerung des Elektromotors über die Rotorwelle an zwei Lagerstellen im Schlagwerksgetriebe, weiter vorteilhaft in einem Getriebegehäuse und in einem Lagerdeckel, optional aus leichtem Aluminiumdruckguss, wodurch eine präzise Führung des kämmenden Motorritzels erzielt wird.Advantageously, the storage of the electric motor via the rotor shaft at two bearings in the percussion gear, further advantageously in a gear housing and in a bearing cap, optionally made of lightweight die-cast aluminum, whereby a precise guidance of the meshing engine pinion is achieved.

Vorteilhaft ist das Rotorblechpaket frei auskragend ausgebildet, wodurch eine massebehaftete blechpaketseitige Lagerstelle entfällt, wodurch der Motorschwerpunkt näher zur Schlagachse verlagert wird.Advantageously, the rotor laminated core is freely cantilevered, whereby a mass-afflicted sheet-metal bearing side bearing is eliminated, whereby the engine center of gravity is moved closer to the impact axis.

Vorteilhaft ist ein massearmes Lüfterrad an dem achsfernen, blechpaketseitigen Stirnende der Rotorwelle angeordnet, wodurch kein achsnaher Bauraum beansprucht wird. Bei einer weiter vorteilhaften Kombination mit dem frei auskragenden Rotorblechpaket wird durch die fehlende Lagerstelle zudem die konstruktive Gestaltung eines Motorgehäuses vereinfacht. Vorteilhaft ist der Elektromotor als bürstenloser Motor, weiter vorteilhaft als Reluktanzmotor ausgebildet, wodurch ein hohes Leistungs / Masse - Verhältnis realisierbar ist.Advantageously, a massearmes fan is arranged on the axis distant, Blechchpaketseitigen front end of the rotor shaft, whereby no axle near installation space is claimed. In a further advantageous combination with the cantilevered rotor core, the structural design of a motor housing is also simplified by the lack of bearing. Advantageously, the electric motor as a brushless motor, further advantageously designed as a reluctance motor, whereby a high power / mass ratio can be realized.

Erfindungsgemäß weisen die Schlagwerksbaugruppe und der Elektromotor einen gemeinsamen Schwerpunkt auf der Schlagachse auf, wodurch analytisch einfachere Erregungen auftreten.According to the invention, the striking mechanism assembly and the electric motor have a common center of gravity on the striking axis, as a result of which analytically simpler excitations occur.

Die Erfindung wird bezüglich eines vorteilhaften Ausführungsbeispiels näher erläutert mit der Darstellung einer Elektrohandwerkzeugmaschine im Teilschnitt.The invention will be explained in more detail with respect to an advantageous embodiment with the representation of an electric hand tool machine in partial section.

Nach der Darstellung weist eine längs einer Schlagachse A schlagende Elektrohandwerkzeugmaschine 1 einen als Reluktanzmotor ausgebildeten Elektromotor 2 mit einer quer zur Schlagachse A angeordneten Rotorwelle 3 mit einem Rotorblechpaket 4 und einem Motorritzel 5 auf. Eine Schlagwerksbaugruppe 6 mit einem Exzenter 7 ist über ein Schlagwerksgetriebe 8 kämmend von dem Motorritzel 4 angetrieben. Das Rotorblechpaket 4 ist bezüglich der Schlagachse A vollständig diametral zum Schlagwerksgetriebe 8 angeordnet. Die Rotorwelle 3 ist unmittelbar benachbart zu einer Kurbelwelle 9 des Exzenters 7 angeordnet, indem ein äusseres Exzenterritzel 10 als Teil des Schlagwerksgetriebes 8 direkt mit dem Motorritzel 5 auf der Rotorwelle 3 kämmt. Die Lagerung des Elektromotors 2 erfolgt über die Rotorwelle 3 an zwei Lagerstellen 11a, 11b im Schlagwerksgetriebe 8 aus leichtem Aluminiumdruckguss, wobei die Lagerstelle 11a in einem Getriebegehäuse 12 und die Lagerstelle 11 b in einem Lagerdeckel 13 angeordnet ist. Die Rotorwelle 3 ist mit dem Rotorblechpaket 4 frei auskragend ausgebildet und an dem achsfernen, blechpaketseitigen Stirnende der Rotorwelle 3 ist ein massearmes Lüfterrad 14 angeordnet. Das Schlagwerksgetriebe 8 ist zu 90% bezüglich der Schlagachse A diametral zum Elektromotor 2 angeordnet, wodurch der gemeinsame Schwerpunkt S der Schlagwerksbaugruppr 6 und des Elektromotors 2 auf der Schlagachse A liegt.According to the illustration, an electric hand-held power tool 1 striking along a striking axis A has an electric motor 2 designed as a reluctance motor with a rotor shaft 3 arranged transversely to the striking axis A with a rotor laminated core 4 and a motor pinion 5. A striking mechanism 6 with an eccentric 7 is driven by a percussion gear 8 meshing of the motor pinion 4. The rotor laminated core 4 is arranged completely diametrically with respect to the percussion gear 8 with respect to the striking axis A. The rotor shaft 3 is arranged directly adjacent to a crankshaft 9 of the eccentric 7, in that an outer eccentric pinion 10 meshes directly with the motor pinion 5 on the rotor shaft 3 as part of the percussion gearbox 8. The bearing of the electric motor 2 via the rotor shaft 3 at two bearings 11a, 11b in the hammer mechanism 8 made of lightweight die-cast aluminum, wherein the bearing 11a in a gear housing 12 and the bearing 11 b is arranged in a bearing cap 13. The rotor shaft 3 is formed with the rotor laminated core 4 cantilevered and at the axis distant, sheet metal packet side front end of the rotor shaft 3 is a massearmes fan 14 is arranged. The percussion gear 8 is arranged at 90% with respect to the striking axis A diametrically to the electric motor 2, whereby the common center of gravity S of the Schlagwerksbaugruppr 6 and the electric motor 2 is located on the striking axis A.

Claims (6)

  1. Electric hand-held power tool for driving a tool to be at least partly percussive along an axis of percussion (A), having an electric motor (2) which has a rotor shaft (3) arranged transversely to the axis of percussion (A), a stack (4) of rotor laminations and a motor pinion (5), and having a percussion mechanism (6) which has percussion mechanism gearing (8) and an eccentric component (7) which, via the percussion mechanism gearing (8), the motor pinion (5) drives in mesh, the whole of the stack (4) of rotor laminations being arranged to be diametrically opposed to the percussion mechanism gearing (8) across the axis of percussion (A), characterised in that the common centre of gravity (S) of the percussion mechanism (6) and the electric motor (2) is situated on the axis of percussion (A).
  2. Electric hand-held power tool according to claim 1, characterised in that the rotor shaft (3) is arranged immediately adjacent to a crankshaft (9) for the eccentric component (7) by having a gear (10) belonging to the eccentric component mesh directly with the motor pinion (5) on the motor shaft (3), as part of the percussion mechanism gearing (8).
  3. Electric hand-held power tool according to claim 1 or 2, characterised in that the electric motor (2) is mounted in the percussion mechanism gearing (8), via the rotor shaft (3), at two bearing points (11a, 11b), which as an option are in a gearing housing (12) and in a bearing cap (13).
  4. Electric hand-held power tool according to one of the preceding claims, characterised in that the stack (4) of rotor laminations is formed to be freely cantilevered.
  5. Electric hand-held power tool according to one of the preceding claims, characterised in that a fan (14) is arranged on the end of the rotor shaft (3) adjacent the stack of laminations and remote from the shaft.
  6. Electric hand-held power tool according to one of the preceding claims, characterised in that the electric motor (2) takes the form of a brushless motor.
EP03104752A 2002-12-19 2003-12-17 Percussion electric hand tool Expired - Lifetime EP1431005B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10259566 2002-12-19
DE10259566A DE10259566A1 (en) 2002-12-19 2002-12-19 Hitting electric hand machine tool

Publications (3)

Publication Number Publication Date
EP1431005A2 EP1431005A2 (en) 2004-06-23
EP1431005A3 EP1431005A3 (en) 2009-07-01
EP1431005B1 true EP1431005B1 (en) 2013-03-06

Family

ID=32336474

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03104752A Expired - Lifetime EP1431005B1 (en) 2002-12-19 2003-12-17 Percussion electric hand tool

Country Status (6)

Country Link
US (1) US7048076B2 (en)
EP (1) EP1431005B1 (en)
JP (1) JP4648624B2 (en)
CN (1) CN100341669C (en)
DE (1) DE10259566A1 (en)
PL (1) PL204879B1 (en)

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EP4324597A1 (en) 2022-08-18 2024-02-21 Hilti Aktiengesellschaft Drill hammer or chisel hammer with a vibration-reduced impact mechanism unit

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Also Published As

Publication number Publication date
PL204879B1 (en) 2010-02-26
CN100341669C (en) 2007-10-10
EP1431005A2 (en) 2004-06-23
EP1431005A3 (en) 2009-07-01
CN1507988A (en) 2004-06-30
DE10259566A1 (en) 2004-07-01
JP2004195648A (en) 2004-07-15
US7048076B2 (en) 2006-05-23
PL364131A1 (en) 2004-06-28
US20040182589A1 (en) 2004-09-23
JP4648624B2 (en) 2011-03-09

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