WO2006056513A1 - Machine-outil a main a changement de mode de fonctionnement - Google Patents

Machine-outil a main a changement de mode de fonctionnement Download PDF

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Publication number
WO2006056513A1
WO2006056513A1 PCT/EP2005/055291 EP2005055291W WO2006056513A1 WO 2006056513 A1 WO2006056513 A1 WO 2006056513A1 EP 2005055291 W EP2005055291 W EP 2005055291W WO 2006056513 A1 WO2006056513 A1 WO 2006056513A1
Authority
WO
WIPO (PCT)
Prior art keywords
shaft
movement
hand tool
tool according
coupling element
Prior art date
Application number
PCT/EP2005/055291
Other languages
German (de)
English (en)
Inventor
Achim Duesselberg
Ernst Kraenzler
Andre Ullrich
Kurt Sieber
Thomas Brinkmann
Original Assignee
Robert Bosch Gmbh
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 Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2006056513A1 publication Critical patent/WO2006056513A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D16/00—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
    • B25D16/006—Mode changers; Mechanisms connected thereto

Definitions

  • the invention relates to a hand tool with an electrical drive motor according to the preamble of claim 1.
  • Hand-held electrically driven machine tools such as percussion drills or rotary hammers, often have several types of operation, which can be set by the operator as desired. For example, in impact drills, the operator may choose between drilling and percussion drilling or drilling drills between drilling, percussion and hammer or chisel. For switching over between these modes of operation, an operating element is generally provided, by the actuation of which the drive motor of the machine tool is coupled to the tool via one or more different force transmission elements which respectively provide a different movement of the tool.
  • a hammer drill of the type mentioned is already known in which the operating mode can be optionally set so that the tool either rotating only in pure drilling operation, rotating and beating in combined hammer drilling operation and pure hammer or chisel operation is driven only hitting.
  • the known hammer drilling machine has an axially non-displaceable intermediate shaft which is rotationally driven by its drive motor and on which a motion conversion element for converting the rotational movement of the shaft into a striking movement of the tool is freely rotatable and axially non-rotatable. is slidably mounted.
  • a coupling bush is further rotatably mounted and axially displaceable by the displacement, the motion conversion member with the shaft bring into rotary engagement or disengage from the rotational engagement with the shaft.
  • the known Hammerbohr ⁇ machine on the intermediate shaft axially displaceable pinion, which can bring by axial displacement either form-fitting with the intermediate shaft in rotary engagement or disengage from the rotational engagement with the shaft.
  • the motion conversion member and the pinion form power transmission elements which each transmit at least a portion of the torque of the intermediate shaft to the tool.
  • a spring is arranged between the coupling sleeve and the pinion, which presses the pinion and the sleeve apart.
  • the hand tool according to the invention offers the advantage that the two power transmission elements can be freely rotatably mounted without spring loading and thus essentially frictionless on the axially non-displaceable shaft, so that they have no noticeable Apply light force on this shaft, as long as they are not coupled via the coupling element with the shaft.
  • the coupling element is preferably displaceable between two end positions, wherein the tool is driven in one end position via the first force transmission element and in the other end position via the second force transmission element, or alternatively in an end position via one of the two Kraft ⁇ transmission elements and in the other end position on both power transmission elements together, for example in a percussion drill in the pure drilling operation or in the combined percussion drilling operation.
  • the Kupplungsele ⁇ ment expediently have two opposite, substantially radially aligned engagement contours or engagement profiles, the - A -
  • the engagement contour of the coupling element is in this case expediently formed by radial toothing on opposite end faces of the coupling element, which complementary complementary radial toothing on the force transmission elements gegenü ⁇ , which can also serve as end stops for the coupling sleeve.
  • a third additional intermediate or middle position may be provided, in which the coupling element for Example of a combined drilling and chiseling operation with both force transmission elements is engaged.
  • the arrangement of the positions may be different if necessary.
  • a further intermediate position can also be provided for an idling operation of the handheld power tool, in which torque is transmitted from the drive motor or from the shaft to none of the force transmission elements.
  • the coupling element is preferably provided on an inner circumferential surface with a substantially axially aligned engagement contour, which is achieved by axial displacement of the coupling element optionally with a complementary axial engagement contour on ei ⁇ ner outer peripheral surface of one or both Kraftüber ⁇ tragungs instituten can be brought into clutch engagement.
  • the engagement contour of the coupling element is expediently formed in this case by radially inwardly protruding teeth, which can be brought into engagement with complementary grooves on the force-transmitting elements.
  • the axial displacement of the coupling element is preferably carried out with the aid of an operating element which projects through an opening in the housing of the power tool to the outside and is displaceable in the axial direction between different positions.
  • the operating element can expediently be lockable in the various displacement positions, for example by latching engagement with the housing, in order to prevent undesired displacement of the coupling element.
  • the connection between the wooba ⁇ ren coupling element and the operating element is preferably given by engagement of a projection of the operating element in a circumferential groove of the coupling element.
  • FIG. 1 shows a partially sectioned side view of parts of the An ⁇ drivetrain of a hammer drill with a device for Um ⁇ switch the mode in a middle position for combined Schlagbohr réelle.
  • Fig. 2 is a view corresponding to Fig. 1, wherein the device for switching the operating mode, however, is in a first end position for pure drilling operation.
  • Fig. 3 is a view corresponding to Fig. 1 and 2, wherein the Vor ⁇ direction for switching the mode, however, is in a second end position for pure hammer or chisel operation.
  • parts of the Antrieb ⁇ strand 2 of a hammer drill 4 are shown in a simplified manner, in which either one of three different modes can be set, namely pure drilling operation in which a drilling tool 6 of the hammer drill 4 is driven only rotationally, pure Hammer- or chisel operation, in which the drilling tool 6 is driven only hitting, and kom ⁇ binierter percussion drilling operation, in which the drilling tool 6 is driven to rotate and hitting.
  • the drive train 2 comprises an electric drive motor 8, the output shaft 10 via a pinion 12 a drive gear 14 on a two rolling bearings 16, 18 rotatably and axially immovable in a housing (not shown) of the hammer drill 4 mounted intermediate shaft 20 drives.
  • the shaft 20 carries a wobble finger 22, which serves in a known manner for converting the rotational movement of the shaft 20 in an axial impact movement of the drilling tool 6, a rotatably mounted behind the wobble finger 22 on the shaft 20 driver element 24, and a gear 26 of a second Getriebe ⁇ stage of the hammer drill 4, in a known manner for transmission the rotational movement of the shaft 20 on a chuck 28 of Bohr ⁇ tool 6 is used.
  • the wobble finger 22 and the gear 26 are freely rotatable and axially non-displaceably mounted on the shaft 20 and each have a protruding in the direction of the driver element 24 cylindrical projection 30 and 32, respectively.
  • the projections 30, 32 are each integral with the wobble finger 22 and the gear 26 ver ⁇ bound and have at their opposite ends the same outer diameter as the driving element 24.
  • the projections 30, 32 can be either individually or jointly rotatably with the driver 24, in order to drive the drilling tool 6 with the aid of the driven driver element 24 either in pure hammer or chisel mode via the wobble finger 22 and a conventional striking mechanism 36 arranged between the free end 34 of the wobble finger 22 and the chuck 28, in pure drilling operation via the gear wheel 26 and a further gear 38 of the second gear stage rotatably an ⁇ drive, or in the combined Schlagbohr shall both on the wobble finger 22 and on the gears 26, 38 to drive striking and rotating.
  • a substantially cylindrical coupling sleeve 40 is provided which surrounds the circumference of the Mit supportiveele ⁇ element 24 and from a in FIG. 1 shown centered axially on both sides in the end positions shown in Fig. 2 and 3, respectively.
  • the coupling sleeve 40 is on its cylindrical inner peripheral surface with radially inwardly superior present teeth (not visible), which extend with a gleich ⁇ remaining engagement profile over the entire length of the Kupplungshül ⁇ se 40 and engage over their entire displacement in kom ⁇ plementäre grooves 44 in the cylindrical outer peripheral surface of the driver element 24 so that the Kupplungs ⁇ sleeve 40 always rotates together with the driver element 24 about the axis of rotation of the shaft 20.
  • the clutch sleeve 40 overlaps only the projection 32 of the gear 26, so that their teeth are disengaged from the grooves 46 of the projection 30 and the wobble finger 22 can rotate freely on the shaft 20 , whereby the drilling tool 6 is driven only rotating.
  • the coupling sleeve 40 In the left end position shown in FIG. 3, the coupling sleeve 40 only overlaps the projection 32 of the wobble finger 22 so that its teeth are disengaged from the grooves 48 of the projection 32 and the gear 26 is free to rotate on the shaft 20 the drilling tool 6 is driven only hitting.
  • the axial displacement of the coupling sleeve 40 takes place with the aid of an operating slider (not shown) connected to the coupling sleeve 40, which is preferably displaceable in a guide of the housing of the rotary hammer 4 adjacent to the coupling sleeve 40.
  • the slider has a protruding inwardly into the housing interior protruding projection whose free end engages in a circumferential groove 50 in the outer peripheral surface of the coupling sleeve 40, so that they can rotate in relation to the operating slide and in each of its rotational positions is displaceable.
  • the operating slide in the central position and the two end positions comes into latching engagement with the housing of the rotary hammer 4 or can be locked in another manner with respect to the housing.

Landscapes

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

Abstract

L'invention concerne une machine-outil à main (4) comportant un moteur d'entraînement électrique (8), un arbre (20) entraîné en rotation par ce moteur d'entraînement (8), un premier élément de transmission de force (22) monté sur l'arbre (20) de façon rotative et axialement fixe, lequel élément peut être accouplé à cet arbre (20) de façon solidaire en rotation par déplacement axial d'un élément d'accouplement (40) pour convertir un mouvement de rotation de l'arbre (20) en un mouvement d'un outil (8) dans un premier sens de mouvement, ainsi qu'un second élément de transmission de force (26) monté sur cet arbre (20) de manière rotative, lequel élément peut être accouplé à l'arbre (20) de façon solidaire en rotation pour convertir le mouvement de rotation de l'arbre (20) en un mouvement de l'outil (8) dans un second sens de mouvement. Selon la présente invention, le second élément de transmission de force (26) peut également être accouplé à l'arbre (20) de façon solidaire en rotation par déplacement axial de l'élément d'accouplement (40).
PCT/EP2005/055291 2004-11-23 2005-10-17 Machine-outil a main a changement de mode de fonctionnement WO2006056513A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200410056411 DE102004056411A1 (de) 2004-11-23 2004-11-23 Handwerkzeugmaschine mit Betriebsartumschaltung
DE102004056411.6 2004-11-23

Publications (1)

Publication Number Publication Date
WO2006056513A1 true WO2006056513A1 (fr) 2006-06-01

Family

ID=35695513

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2005/055291 WO2006056513A1 (fr) 2004-11-23 2005-10-17 Machine-outil a main a changement de mode de fonctionnement

Country Status (2)

Country Link
DE (1) DE102004056411A1 (fr)
WO (1) WO2006056513A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008107253A1 (fr) * 2007-03-02 2008-09-12 Robert Bosch Gmbh Machine-outil à main
CN110561359A (zh) * 2018-06-06 2019-12-13 苏州宝时得电动工具有限公司 手持式动力工具以及夹头组件

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19801986A1 (de) * 1997-04-18 1998-10-22 Hitachi Koki Kk Vorrichtung zum Schalten von Betriebsmodi für eine Hammerbohrmaschine
US5992257A (en) * 1996-10-11 1999-11-30 Black & Decker Inc. Power tool with mode change switch
EP1157788A2 (fr) * 2000-04-07 2001-11-28 Black & Decker Inc. Mécanisme de changement de mode de fonctionnement pour marteau rotatif

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5992257A (en) * 1996-10-11 1999-11-30 Black & Decker Inc. Power tool with mode change switch
DE19801986A1 (de) * 1997-04-18 1998-10-22 Hitachi Koki Kk Vorrichtung zum Schalten von Betriebsmodi für eine Hammerbohrmaschine
EP1157788A2 (fr) * 2000-04-07 2001-11-28 Black & Decker Inc. Mécanisme de changement de mode de fonctionnement pour marteau rotatif

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008107253A1 (fr) * 2007-03-02 2008-09-12 Robert Bosch Gmbh Machine-outil à main
US8490715B2 (en) 2007-03-02 2013-07-23 Robert Bosch Gmbh Hand-held machine tool
CN110561359A (zh) * 2018-06-06 2019-12-13 苏州宝时得电动工具有限公司 手持式动力工具以及夹头组件

Also Published As

Publication number Publication date
DE102004056411A1 (de) 2006-05-24

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