EP2576145A1 - Machine-outil portative équipée d'un organe de percussion mécanique - Google Patents

Machine-outil portative équipée d'un organe de percussion mécanique

Info

Publication number
EP2576145A1
EP2576145A1 EP11721277.9A EP11721277A EP2576145A1 EP 2576145 A1 EP2576145 A1 EP 2576145A1 EP 11721277 A EP11721277 A EP 11721277A EP 2576145 A1 EP2576145 A1 EP 2576145A1
Authority
EP
European Patent Office
Prior art keywords
compression spring
washer
drive shaft
impactor
hand 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.)
Withdrawn
Application number
EP11721277.9A
Other languages
German (de)
English (en)
Inventor
Peng Eng Lin
Sim Teik Yeoh
Chuan Cheong Yew
Daniel Brogli
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.)
Robert Bosch GmbH
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 EP2576145A1 publication Critical patent/EP2576145A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING, OR HOLDING
    • B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
    • B25B21/02—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose with means for imparting impact to screwdriver blade or nut socket
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING, OR HOLDING
    • B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
    • B25B21/02—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose with means for imparting impact to screwdriver blade or nut socket
    • B25B21/026—Impact clutches
    • 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
    • B25D11/10—Means for driving the impulse member comprising a cam mechanism
    • B25D11/102—Means for driving the impulse member comprising a cam mechanism the rotating axis of the cam member being coaxial with the axis of the tool
    • B25D11/104—Means for driving the impulse member comprising a cam mechanism the rotating axis of the cam member being coaxial with the axis of the tool with rollers or balls as cam surface
    • 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
    • B25D17/11—Arrangements of noise-damping means
    • 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
    • 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
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/241—Sliding impact heads, i.e. impact heads sliding inside a rod or around a shaft

Definitions

  • the present invention relates to a hand tool with a provided for a beating drive an insert tool mechanical percussion having acted upon by a compression spring in the direction of the inserting impactor, which is rotatably connected to an associated drive shaft and axially slidably mounted on the drive shaft, said Compressive spring bears against a washer at its end facing away from the impactor body.
  • a rotary impact wrench hand tool which has a mechanical percussion for a beating drive an insert tool.
  • This mechanical percussion mechanism has an impact body which is connected in a rotationally fixed manner to an associated drive shaft of the handheld power tool and is mounted so as to be axially displaceable on the drive shaft. The impactor is acted upon with an associated compression spring in the direction of the insert tool.
  • a disadvantage of the prior art is that in no-load operation of the power tool, ie in an operating mode in which no impact generation is required, the striker is rotated with the drive shaft, while the compression spring in the direction of rotation of the drive shaft remains substantially immobile, ie not is turned. This causes due to friction occurring here unwanted vibrations in the power tool, which can lead to a significant noise and thus loss of comfort when using the power tool. Disclosure of the invention
  • An object of the invention is therefore to provide a new hand tool with a mechanical striking mechanism, in which at least a reduction of the noises generated by the impact mechanism in no-load operation is made possible.
  • a hand tool with a provided for a beating drive an insert tool mechanical percussion, which has acted upon by a compression spring in the direction of the inserting impactor, which is rotatably connected to an associated drive shaft and axially slidably mounted on the drive shaft.
  • the compression spring abuts against a washer at its end facing away from the impactor body.
  • the washer is axially displaceable and rotatably mounted on the drive shaft.
  • the invention thus makes it possible to provide a hand tool with a mechanical impact mechanism, in which the washer and thus the compression spring in the no-load operation of the power tool can rotate with the drive shaft, so that no friction can occur between compression spring and washer and thus unwanted vibration and a resulting undesirable Noise development can be reduced at least.
  • the washer has a disk body, on which an annular groove is formed, in which the direction away from the impactor end of the compression spring is arranged.
  • the annular groove of the disk body preferably has a beveled in the direction of the insert tool ring collar in a radially away from the drive shaft direction.
  • Reinforcement struts are preferably formed on the disk body.
  • an attenuator is disposed between the washer and the striker.
  • the invention thus enables a safe damping of axial movements of the impactor in a Schlagerzeugung.
  • the washer is preferably formed by plastic injection to the direction away from the impactor end of the compression spring.
  • the striker has an annular groove facing the compression spring, in which an end of the compression spring facing the striker is arranged.
  • a pressure ball bearing is preferably arranged in the annular groove of the impactor.
  • the impactor facing the end of the compression spring is preferably against the thrust ball bearing.
  • annular disc is preferably arranged between the thrust ball bearing and the impactor facing the end of the compression spring.
  • a mechanical hammer mechanism for the impact drive of an insertion tool of a hand tool which has an impactor acted upon by a compression spring in the direction of the insertion tool, which is rotatably connected to a drive shaft associated with the power tool and axially slidably mounted on the drive shaft ,
  • the compression spring abuts against a washer at its end facing away from the impactor body.
  • the washer is axially displaceable and rotatably mounted on the drive shaft.
  • FIG. 1 is a schematic view of a hand tool with an insertion tool according to an embodiment
  • FIG. 2 shows a sectional view of a proximal section of the mechanical percussion mechanism of the hand tool of FIG. 1 according to one embodiment
  • FIG. 3 shows a perspective view of the washer of FIG. 2, FIG.
  • Fig. 4 is a plan view of a top and a side view of the washer of Fig. 3
  • Fig. 5 is a perspective view of a washer for the mechanical
  • FIG. 6 is a plan view of an upper side and a side view of the washer of FIG. 5
  • FIG. 7 is a sectional view of a distal portion of the mechanical percussion mechanism of the portable power tool of FIG. 1 according to an embodiment
  • Fig. 8 is a perspective view of the thrust ball bearing of Fig. 7. Description of the embodiments
  • FIG. 1 shows a hand tool 100 provided with a tool holder 150, which has a housing 110 having a handle 126.
  • the handheld power tool 100 for mains-independent power supply can be mechanically and electrically connected to a battery pack 130.
  • the drive motor 1 14 is z. B. via a manual switch 128 actuated, d. H. can be switched on and off, and can be any type of engine, eg. As an electronically commutated motor or a DC motor.
  • the drive motor 1 14 so electronically controlled or controlled that both a reversing operation, as well as specifications with respect to a desired rotational speed can be realized.
  • the mode of operation and the design of a suitable drive motor are sufficiently known from the prior art, so that a detailed description of the description is omitted here for the purpose of conciseness of the description.
  • the drive motor 1 14 is connected via an associated motor shaft 1 16 to the transmission 1 18, which converts a rotation of the motor shaft 1 16 in a rotation of a provided between the transmission 1 18 and striking mechanism 122 drive shaft 120. This conversion is preferably such that the drive shaft 120 rotates relative to the motor shaft 116 with increased torque but reduced rotational speed.
  • the drive motor 1 14 is illustratively arranged in a motor housing 1 15 and the transmission 1 18 in a transmission housing 1 19, wherein the transmission housing 1 19 and the motor housing 1 15 are arranged for example in the housing 1 10.
  • the mechanical percussion mechanism 122 connected to the drive shaft 120 is an example of a rotary striking mechanism which generates sudden high-intensity angular momentum and acts on an output shaft 124, e.g. B.
  • the tool holder 150 is provided on the output shaft 124, which is preferably designed for receiving insert tools and, according to one embodiment, can be connected both to an insert tool 140 with external polygon coupling 142 and to an insert tool having an internally polygonal coupling ,
  • the insert tool 140 is exemplified as a screwdriver bit with the external polygon coupling 142, illustratively an octagonal coupling formed. Such a screwdriver bit is sufficient from the
  • the power tool 100 is exemplified as a cordless impact wrench.
  • the present invention is not limited to cordless impact wrench, but rather can be found in different power tools application in which the mechanical percussion 122 is used to beat production, z.
  • the power tool is net inde pendent with a battery pack or network-dependent operable.
  • FIG. 2 shows a distal portion of the transmission 1 18 of FIG. 1 arranged in the transmission housing 1 19 and a proximal portion of the mechanical impact mechanism 122 of FIG. 1 according to an embodiment. This is il- lustrativ arranged in a housing part 222 which on the transmission housing
  • the transmission 1 18 is an example of a planetary gear and illustratively has a sun gear 209, at least one planetary gear 215, 217, a planet carrier or driver 218, as well as an axially and radially immovable in the transmission housing 1 19 arranged ring gear 206.
  • the sun gear 209 is an example Bearing device 219 rotatably mounted on the drive shaft 120.
  • the driver 218 is illustratively formed integrally with the drive shaft 120, z. B. molded on this. Alternatively, the driver 218 may be connected to the drive shaft 120 via a suitable connection device.
  • the planetary gear 1 18 may be switchable between a plurality of stages according to an embodiment and is illustratively switchable between a first and a second stage, wherein the first stage of the sun gear 209, the at least one planetary gear 215, 217, the planet carrier 218 and the Ring gear 206 is formed.
  • a second stage 21 1 is merely indicated for the purpose of scarcity and clarity of the drawing. It should be noted, however, that a person skilled in a suitable structure of a suitable planetary gear is well known, so that can be dispensed with a detailed description here.
  • a trained as a ball bearing bearing 234 for supporting the drive shaft 120 is arranged by way of example. It should be understood, however, that other types of bearings may be used within the scope of the present invention.
  • bearing 234 may alternatively be realized as a plain bearing, needle sleeve, roller bearing, or other type of rolling bearing.
  • a washer 240 associated with the mechanical percussion mechanism 122 is arranged on a distal end face 299 of the transmission housing 12, which has an opening 242 and is rotatably and axially displaceably mounted on the drive shaft 120 via this.
  • a shock body 225 rotatably connected to the drive shaft 120 and axially slidably mounted on this.
  • damper 244 is arranged, and a drive shaft 120 embracing compression spring 228 for impact generation during operation of the power tool 100 of FIG. 1, as described below.
  • the compression spring 228 is located at its end facing away from the impactor 225 end
  • the washer 240 z. B. may be formed by plastic injection to the compression spring 228.
  • the compression spring 228 and the washer 240 may be integrally formed.
  • the compression spring 228 is disposed in the striker 225 as described below in FIG. 7.
  • the compression spring 228 is supported on the washer 240 and acts on the striking body 225 in the distal direction, ie in the direction of the insertion tool 140 of FIG. 1, as indicated by an arrow 229.
  • the striker 225 rotates in a distal end position shown in FIG. 2 with the drive shaft 120.
  • the compression spring 228 rotates and, with this, the washer 240 at least substantially frictionless also with the drive shaft 120th
  • Fig. 3 shows the washer 240 of Fig. 2 with the opening 242, which is exemplified approximately centrally.
  • the washer 240 has a reinforcement struts 341, 342, 343, 344, 345 provided
  • Disk body 340 to which a substantially perpendicular thereto formed annular wall 346 is integrally formed so that disk body 340 and ring wall 346 are formed about the reverse pot-shaped.
  • the annular wall 346 is provided with a radial extension 349, which in
  • annular collar 348 is formed, which is tapered with respect to the radial extension 349 such that an annular groove 347 is formed between the annular wall 346 and the annular collar 348.
  • FIG. 4 illustrates the reinforcing struts 341, 342, 343, 344, 345 provided on the disk body 340 and an angle 410 with which the annular collar 348 is bevelled by the radial extension 349.
  • FIGS. 5 and 6 show an exemplary alternative embodiment of a washer 500 for the mechanical percussion mechanism 122 of FIGS. 1 and 2. In contrast to the washer 240 of FIGS. 2 to 4, this does not have an annular collar 348.
  • FIG. 7 shows a distal section of the mechanical percussion mechanism 122 of FIGS. 1 and 2 according to one embodiment, with the impactor 225 mounted on the drive shaft 120, which is acted upon by the compression spring 228 in the direction of the output shaft 124. This is rotationally fixed to the drive shaft 120 via an output cam 724.
  • the impactor body 225 is cup-shaped, with an annular bottom portion 798, the output shaft 124 facing end face 730 rests against the output cam 724 in load-free operation of the power tool 100 of FIG.
  • An inner, annular wall section 732 and an outer, annular wall section 734 are integrally formed on the bottom section 798 formed with a central opening 799, which form with the bottom section 798 a ring groove 736 facing the compression spring 228 in FIG.
  • the impactor 225 facing the end 226 of the compression spring 228 is arranged, which illustratively rests against an annular disc 760, which may be attached to the compression spring 228 or formed on this.
  • the compression spring 228 acts on the annular disc 760 in the direction of the bottom Section 798 and thus in the direction of the output cam 724 against an arranged in the annular groove 736 thrust ball bearing 750.
  • This has an approximately U-shaped support ring 752 in which a plurality of balls 754, 756 are arranged.
  • the annular disc 760 abuts against the carrier ring 752 and the balls 754, 756 thus against the bottom portion 798.
  • annular disc 760 is used only to achieve an improved pressure distribution on the thrust ball bearing 750 and thus also an embodiment of the mechanical percussion 122 without the annular disc 760 is possible, in which the impactor 225 facing the end 226 of the compression spring 228 rests directly against the thrust ball bearing 750.
  • the thrust ball bearing 750 is designed to permit a rotation of the striking body 225 relative to the compression spring 228 when the impact mechanism 122 generates impact during operation of the power tool 100 of FIG. 1.
  • rotation of the pressure spring 228 is prevented, while the impactor body 225 continues its rotation or rotation about the drive shaft 120.
  • the impactor body 225 also rotates relative to the thrust ball bearing 750, which is prevented by the force of the compression spring 228 from further rotation and whose balls 754, 756 thus perform a rolling movement in the annular groove 736.
  • the thrust ball bearing 750 rotates again with the compression spring 228, the annular disc 760 and the impactor body 225 until the next generation of whip.
  • FIG. 8 illustrates an exemplary embodiment of the thrust ball bearing 750 of FIG. 7.
  • FIG. 8 illustrates a plurality of balls disposed in the approximately U-shaped carrier ring 752, of which only the balls 754, 756 are used for simplicity and clarity of the drawing Marked are. It should be noted, however, that the configuration of a suitable thrust ball bearing 750 is sufficiently well known to those skilled in the art, so that a detailed description is omitted here for the sake of brevity of the description.

Landscapes

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

Abstract

L'invention concerne une machine-outil portative équipée d'un organe de percussion (122) mécanique pour entraîner en percussion un outil d'insertion (140), cet organe de percussion présentant un corps de percussion (225) asservi par un ressort de pression (228) en direction de l'outil d'insertion (140), ce corps de percussion étant relié solidaire en rotation à un arbre d'entraînement (120) associé sur lequel il est logé coulissant dans l'axe, l'extrémité (227) du ressort de pression (228) opposée au corps de percussion (225) appuyant contre une rondelle (240). Selon l'invention, la rondelle (240) est logée coulissante dans l'axe et pivotante sur l'arbre d'entraînement (120).
EP11721277.9A 2010-06-01 2011-05-12 Machine-outil portative équipée d'un organe de percussion mécanique Withdrawn EP2576145A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201010029559 DE102010029559A1 (de) 2010-06-01 2010-06-01 Handwerkzeugmaschine mit einem mechanischen Schlagwerk
PCT/EP2011/057700 WO2011151145A1 (fr) 2010-06-01 2011-05-12 Machine-outil portative équipée d'un organe de percussion mécanique

Publications (1)

Publication Number Publication Date
EP2576145A1 true EP2576145A1 (fr) 2013-04-10

Family

ID=44119049

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11721277.9A Withdrawn EP2576145A1 (fr) 2010-06-01 2011-05-12 Machine-outil portative équipée d'un organe de percussion mécanique

Country Status (4)

Country Link
EP (1) EP2576145A1 (fr)
CN (1) CN102905852A (fr)
DE (1) DE102010029559A1 (fr)
WO (1) WO2011151145A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011089914A1 (de) * 2011-12-27 2013-06-27 Robert Bosch Gmbh Handwerkzeugvorrichtung
DE102014109412B3 (de) * 2014-07-04 2015-09-10 C. & E. Fein Gmbh Reiblager zwischen Läufer und Amboss in einem Schlagschrauber
DE102015204807A1 (de) * 2015-03-17 2016-09-22 Robert Bosch Gmbh Handwerkzeugmaschine sowie mechanisches Schlagwerk
DE102017128988A1 (de) * 2017-12-06 2019-06-06 ENDO-PASSION GmbH Vorrichtung zum Lösen von, insbesondere kaltverschweißten, Schrauben in der Orthopädie sowie einem Werkzeugeinsatz
JP6668449B2 (ja) * 2018-12-26 2020-03-18 株式会社マキタ インパクト工具
DE102021214868A1 (de) 2021-12-22 2023-06-22 Robert Bosch Gesellschaft mit beschränkter Haftung Handwerkzeugmaschine
DE102022209286A1 (de) * 2022-09-07 2024-03-07 Robert Bosch Gesellschaft mit beschränkter Haftung Handwerkzeugmaschine mit einem mechanischen Drehschlagwerk

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EP0942809A1 (fr) * 1997-08-08 1999-09-22 Power Tool Holders Incorporated Dispositif d'entrainement pour outil a percussion
US5992538A (en) * 1997-08-08 1999-11-30 Power Tool Holders Incorporated Impact tool driver
JP2002254336A (ja) * 2001-03-02 2002-09-10 Hitachi Koki Co Ltd 電動工具
US7308948B2 (en) * 2004-10-28 2007-12-18 Makita Corporation Electric power tool
DE202006014850U1 (de) * 2006-09-27 2006-11-23 Robert Bosch Gmbh Mechanisches Schlagwerk
DE102006045842A1 (de) * 2006-09-27 2008-04-03 Robert Bosch Gmbh Handwerkzeugmaschine
CN101288950B (zh) * 2007-04-18 2011-08-03 苏州宝时得电动工具有限公司 多功能动力工具
CN201208740Y (zh) * 2008-03-28 2009-03-18 南京德朔实业有限公司 一种旋转冲击工具
EP2140976B1 (fr) * 2008-07-01 2011-11-16 Metabowerke GmbH Vis autotaraudeuse à frapper

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Also Published As

Publication number Publication date
WO2011151145A1 (fr) 2011-12-08
CN102905852A (zh) 2013-01-30
DE102010029559A1 (de) 2011-12-01

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