EP3124182A1 - Machine-outil portative - Google Patents

Machine-outil portative Download PDF

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Publication number
EP3124182A1
EP3124182A1 EP15179229.8A EP15179229A EP3124182A1 EP 3124182 A1 EP3124182 A1 EP 3124182A1 EP 15179229 A EP15179229 A EP 15179229A EP 3124182 A1 EP3124182 A1 EP 3124182A1
Authority
EP
European Patent Office
Prior art keywords
countershaft
axis
hand tool
along
tool according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP15179229.8A
Other languages
German (de)
English (en)
Inventor
Thomas Bader
Yun Guo
Aaron Wiedner
Markus Hartmann
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 EP15179229.8A priority Critical patent/EP3124182A1/fr
Priority to PCT/EP2016/067737 priority patent/WO2017021204A1/fr
Publication of EP3124182A1 publication Critical patent/EP3124182A1/fr
Withdrawn legal-status Critical Current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
    • B25D11/062—Means for driving the impulse member comprising a wobbling mechanism, swash plate
    • 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
    • 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
    • B25D2211/006—Parallel 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
    • B25D2216/0015—Tools having a percussion-only mode
    • 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
    • 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
    • B25D2216/0038—Tools having a rotation-only mode
    • 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
    • B25D2250/331—Use of bearings

Definitions

  • the present invention relates to a hand tool with a pneumatic percussion, in particular with a driven by a wobble pneumatic percussion.
  • a driven by a wobble pneumatic percussion is for example from the DE 2005 03673101 A1 known.
  • the hand tool of the invention has a tool holder for holding a tool on a working axis and an electric motor.
  • a first countershaft is arranged on an axis parallel to the working axis and coupled to the electric motor.
  • a wobble drive is mounted on the countershaft.
  • the wobble drive has a shift sleeve movable along the first countershaft for coupling and uncoupling the wobble drive to the rotational movement of the first countershaft.
  • a pneumatic striking mechanism has a pathogen coupled to the wobble drive and a club coupled to the exciter via a pneumatic chamber.
  • a second countershaft is arranged on the axle and in extension of the first countershaft.
  • the second countershaft is rotatably mounted about the axis in a second pivot bearing.
  • the second countershaft is movable along the axis.
  • a pinion is provided which meshes with a toothing arranged on the working axis output shaft.
  • the countershaft is subject to axial and radial loads due to the reaction of the pneumatic hammer mechanism and the rotary drive of the tool holder. Multiple storage and support of the countershaft is manufacturing reasons not to solve.
  • the associated bearings can not be positioned with sufficient accuracy on one axis.
  • the solution according to the invention is based on the fact that although for the wobble drive an axially fixed countershaft, however, an axial for the rotary drive floating countershaft is possible. It has been recognized that by dividing the countershaft and the different bearing a larger number of radially fixing support bearings can be used without increased effort in terms of alignment of the bearing with respect to the axis.
  • first countershaft is mounted fixed along the axis and the second countershaft is mounted floating along the axis.
  • the second countershaft may be freely rotatable relative to the first countershaft.
  • the first pivot bearing for supporting the first countershaft may have exactly two rolling bearings, which are arranged offset from each other along the axis.
  • the second pivot bearing may have exactly one roller bearing for supporting the second countershaft.
  • the first countershaft has frontally a cylindrical receptacle, in which the second countershaft is inserted. The first countershaft thus supports the second countershaft in the radial direction.
  • Fig.1 shows an exemplary hammer drill 1.
  • the hammer drill 1 has a tool holder 2, in which a shank end of a tool, such as one of the drill, can be used.
  • a primary drive of the hammer drill 1 is an electric motor 3, which drives a striking mechanism 4 and an output shaft 5 .
  • a battery pack or a power line 6 supplies the electric motor 3 with power.
  • a user can guide the hammer drill 1 by means of a handle 7 and the hammer drill 1 by means of a system switch 8 in Start operation.
  • the hammer drill 1 rotates the tool continuously about a working axis 9 and can beat the drill in the direction of impact 10 along the working axis 9 in a substrate.
  • a selector switch 11 may selectively turn off the percussion mechanism 4 or the output shaft 5 to allow for purely rotary, all-hitting, or combined rotary and beating operation.
  • the electric motor 3 is coupled to a first countershaft 12 .
  • the first countershaft 12 is located on an axis 13 which is offset parallel to the working axis 9 of the percussion mechanism 4 and the tool holder 2 .
  • the first countershaft 12 is supported by a first pivot bearing 14 .
  • the pivot bearing 14 has two rolling bearings, which offset along the axis 13 , the first countershaft 12 are supported in two places.
  • the electric motor 3 closer, right rolling bearing 15 is for example a ball bearing.
  • the other left rolling bearing 16 is for example a needle bearing.
  • the first countershaft 12 is fixed in the first pivot bearing 14 along the axis 13 .
  • the fixation can be done for example by the opposite hiring the two bearings.
  • a ball bearing can be used with a very small axial play and with, for example, a press fit, be fixedly mounted on the first countershaft 12 .
  • the first countershaft 12 carries a wobble drive 17.
  • a swash plate 18 is preferably rotatably mounted on the first countershaft 12 , so that the first countershaft 12 can rotate without necessarily driving the wobble drive 17 .
  • a shift sleeve 19 is displaceable on the first countershaft 12 along the axis 13 .
  • the shift sleeve 19 engages in a toothing 20 on the first countershaft 12 a.
  • the swash plate 19 has a further toothing 21, in which the switching sleeve 19 engages or does not engage depending on the axial position.
  • the selector switch 11 moves the shift sleeve 19 between the two positions and thus switches the wobble drive 17 off or on.
  • the wobble drive 17 drives a pneumatic impact mechanism 4 .
  • a pathogen 22 is guided on the working axis 9 .
  • a wobble finger 23 of the wobble drive 17 is coupled to the exciter 22 and forces it to a periodic forward and backward movement along the working axis 9.
  • the exemplary exciter 22 is designed cup-shaped.
  • a bat 24 is inserted in the exciter 22 .
  • the racket 24 includes in the exciter 22 from a pneumatic chamber 25 , which couples the bat 24 to the exciter 22 as an air spring. The racket 24 can strike indirectly or directly via an anvil 26 on the tool holder 2 held in the tool.
  • a second countershaft 27 is located on the axis 13.
  • the second countershaft 27 is freely rotatable relative to the first countershaft 12 about the axis 13 .
  • the second countershaft 27 is not driven by the first countershaft 12 .
  • the second countershaft 27 is floatingly supported on the axle 13 .
  • the second countershaft 27 is movable along the axis 13 with respect to the first countershaft 12 .
  • a second pivot bearing 28 supports the second countershaft 27.
  • the pivot bearing 28 contains exactly one rolling bearing 29, in which the end of the second countershaft 27 remote from the first countershaft 12 is supported.
  • the rolling bearing 29 is preferably a needle bearing, which forces no or only a slight axial guidance of the second countershaft 27 .
  • the first countershaft 12 facing the end of the second countershaft 27 is supported on the first countershaft 12 .
  • the second countershaft 27 facing end side of the first countershaft 12 may have a cylindrical receptacle 30 .
  • the second countershaft 27 is located in the receptacle 30.
  • the receptacle 30 has over the second countershaft 27 a game, so that the two countershafts 12, 27 are rotatable relative to each other.
  • the second countershaft 27 may be decoupled from the electric motor 3 .
  • a pinion 31 is mounted for example on the second countershaft 27 .
  • the pinion 31 is preferably freely rotatable relative to the second countershaft 27 .
  • a sleeve 32 may couple the pinion 31 to the first countershaft 12 .
  • the exemplary sleeve 32 has an outer toothing, which engages in an internal toothing 33 on the end face of the first countershaft 12 .
  • the pinion 31 and the sleeve 32 may be integrally connected or otherwise connected to each other. In the exemplary embodiment, the pinion 31 and sleeve 32 have the same cross section.
  • the sleeve 32 is preferably displaceable along the axis 13 , for example by the selector switch 11.
  • the pinion 31 and the sleeve 32 can be arranged axially immovably on the second countershaft 27 .
  • the pinion 31 and the sleeve 32 are mounted with a press fit on the second countershaft 27 or formed integrally with the countershaft 27 .
  • the pinion 31 meshes with a toothing 34 on the output shaft 5.
  • the output shaft 5 rotates about the working axis 9 and is coupled to the tool holder 2 for transmitting the rotary motion to the tool.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Drilling And Boring (AREA)
EP15179229.8A 2015-07-31 2015-07-31 Machine-outil portative Withdrawn EP3124182A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP15179229.8A EP3124182A1 (fr) 2015-07-31 2015-07-31 Machine-outil portative
PCT/EP2016/067737 WO2017021204A1 (fr) 2015-07-31 2016-07-26 Machine-outil portative

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP15179229.8A EP3124182A1 (fr) 2015-07-31 2015-07-31 Machine-outil portative

Publications (1)

Publication Number Publication Date
EP3124182A1 true EP3124182A1 (fr) 2017-02-01

Family

ID=53776406

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15179229.8A Withdrawn EP3124182A1 (fr) 2015-07-31 2015-07-31 Machine-outil portative

Country Status (2)

Country Link
EP (1) EP3124182A1 (fr)
WO (1) WO2017021204A1 (fr)

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
EP1157788A2 (fr) * 2000-04-07 2001-11-28 Black & Decker Inc. Mécanisme de changement de mode de fonctionnement pour marteau rotatif
DE102005036731A1 (de) 2005-08-04 2007-02-08 Robert Bosch Gmbh Kupplungsvorrichtung für eine Elektrowerkzeugmaschine und Elektrowerkzeugmaschine

Patent 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
EP1157788A2 (fr) * 2000-04-07 2001-11-28 Black & Decker Inc. Mécanisme de changement de mode de fonctionnement pour marteau rotatif
DE102005036731A1 (de) 2005-08-04 2007-02-08 Robert Bosch Gmbh Kupplungsvorrichtung für eine Elektrowerkzeugmaschine und Elektrowerkzeugmaschine

Also Published As

Publication number Publication date
WO2017021204A1 (fr) 2017-02-09

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