EP2651604A1 - Machine-outil à main pourvue d'un organe de percussion mécanique - Google Patents

Machine-outil à main pourvue d'un organe de percussion mécanique

Info

Publication number
EP2651604A1
EP2651604A1 EP11785695.5A EP11785695A EP2651604A1 EP 2651604 A1 EP2651604 A1 EP 2651604A1 EP 11785695 A EP11785695 A EP 11785695A EP 2651604 A1 EP2651604 A1 EP 2651604A1
Authority
EP
European Patent Office
Prior art keywords
drive
output shaft
cam
impact
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Withdrawn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
EP11785695.5A
Other languages
German (de)
English (en)
Inventor
Mohsein Wan
Chuan Cheong Yew
Chun How Low
Siew Yuen Lee
Chun Chee Loh
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 EP2651604A1 publication Critical patent/EP2651604A1/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Withdrawn legal-status Critical Current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

Definitions

  • the present invention relates to a portable power tool with a mechanical striking mechanism, which has at least one provided with a drive cam impact body and provided with at least one output cam output shaft which is provided with a tool holder for receiving a
  • the drive cam is formed for the striking drive of the output cam in the impact mode of the mechanical percussion.
  • DE 20 2006 014 850 U1 designed as a rotary impact wrench power tool is known, which has a mechanical percussion with a striker and an output shaft.
  • drive cams formed on the impactor engage in output cams provided on the output shaft such that rotational movement of the impactor is transmitted to the output shaft.
  • the drive cams drive the output cams in an associated direction of rotation in a striking manner, with a respective impact generation each hammering a drive cam against an associated output cams.
  • a disadvantage of the prior art is that the impact generation in impact operation of the impact mechanism leads to a disturbing noise and thus to loss of comfort in the use of such a power tool.
  • An object of the invention is therefore to provide a new hand tool that has a mechanical percussion that allows at least a reduction of noise in the impact mode.
  • a hand tool with a mechanical striking mechanism which has at least one provided with a drive cam impact body and provided with at least one output cam output shaft which is connected to a tool holder for receiving a tool.
  • the drive cam is designed for the impact drive of the output cam in the impact mode of the mechanical impact mechanism.
  • the output shaft is drivable by a pot-like drive body which surrounds the output shaft at least in sections.
  • the at least one impactor is arranged radially displaceable in the drive body and has an opening through which passes through the output shaft.
  • the invention thus makes it possible to provide a hand tool with a mechanical striking mechanism, in which a Sch.zeugung takes place both within a pot-like drive body and within an associated impact body, so that drive and impact body as damping members for
  • the at least one impactor is supported via an associated spring element on the inner circumference of the pot-like drive body.
  • the drive cam is preferably formed in the opening of the at least one impactor in the manner of a radially inwardly directed bulge.
  • the at least one impactor is supported via the associated spring element on the inner circumference of the drive body such that the spring element acts on the radially inwardly directed recess with a predetermined pressure force in the direction of the output shaft.
  • the invention thus enables a safe and reliable loading of the drive cam forming bulge in the direction of the output shaft.
  • the at least one output cam is preferably formed on the outer circumference of the output shaft in the manner of a radially outward extension.
  • the pot-like drive body has at least one guide recess, in which the at least one impact body is arranged rotationally fixed and radially displaceable.
  • the guide recess preferably has two guide walls oriented substantially parallel to one another, on which preferably two substantially parallel aligned side walls of the at least one
  • Impact body are slidably mounted.
  • the impactor can be stored in a simple manner sliding in the drive body.
  • the guide recess and the at least one impact body preferably each have an at least quadrangular cross section.
  • At least a first and a second impact body are arranged in the pot-like drive body, which at least one first and a second output cam are assigned, which are formed on the output shaft.
  • the invention thus makes it possible in a simple manner to increase a corresponding rate of impact of the mechanical impact mechanism during impact operation.
  • the pot-like drive body is preferably non-rotatably connected to a drivable by an associated gear drive member.
  • FIG. 1 is a schematic view of a hand tool with an insertion tool according to an embodiment
  • FIG. 2 is an enlarged sectional view of a section of the hand tool of FIG. 1 according to an embodiment
  • FIG. 3 is an exploded perspective view of the arrangement of Fig. 2,
  • Fig. 4 is a first sectional view of the arrangement of Fig. 2 in the impact mode of the mechanical impact mechanism of Fig. 1 and 2, as seen in the direction of the arrows IV of Fig. 2, and
  • FIG. 5 shows a second sectional view of the arrangement of FIG. 2 in the impact mode of the mechanical impact mechanism of FIGS. 1 and 2, as seen in the direction of the arrows IV of FIG. 2.
  • the handheld power tool 100 for mains-independent power supply can be mechanically and electrically connected to a battery pack 130.
  • the hand tool 100 is exemplified as a cordless rotary impact wrench. It should be noted, however, that the present invention is not limited to cordless impact drivers, but rather can be applied to various tools, particularly power tools, where a tool is rotated, e.g. For example, in a percussion drill, etc., regardless of whether the power tool is net inde pendent with a battery pack or network-dependent operable. In addition, it should be noted that the present invention is not limited to power tool hand tools, but is generally applicable to tools in which the hammer mechanism 200 described in FIGS. 2 to 5 may find application.
  • 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 114 is 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 operation and structure of a suitable drive motor are well known from the prior art and are therefore not further described here for the sake of brevity of the description.
  • the drive motor 114 is connected via an associated motor shaft 1 16 and an associated drive element 1 19 with the gear 118, the rotation of the motor shaft 1 16 in a rotation of a between transmission 1 18 and
  • the drive motor 114 is illustratively arranged in a motor housing 115 and the transmission 1 18 in a housing 180, which is arranged with the motor housing 1 15 by way of example in the tool housing 1 10. It should be understood, however, that the transmission 118 and percussion mechanism 200 are merely illustratively disposed in the housing 180 and not for the purpose of limiting the invention. Rather, can transmission 1 18 and Schlagtechnik 200 z. B. also be arranged in separate housings, which are arranged in the tool housing 110, or also directly in the tool housing 110th
  • the mechanical striking mechanism 200 connected to the drive member 120 is an example of a rotary striking mechanism. This is according to an embodiment for the generation of sudden high-intensity rotational pulses formed, which via an output cam assembly 410 to an output shaft 400, z.
  • the hammer mechanism 200 has a drive body 300, which is connected in a rotationally fixed manner to the drive member 120.
  • An enlarged view of a percussion 200, the output shaft 400 and the transmission 1 18 showing section 150 of the power tool 100 is illustrated in Fig. 2.
  • the tool holder 450 is fixed, which is preferably designed for receiving insert tools and according to one embodiment with an insert tool 140 with a polygon socket coupling 142, z. B. a socket, connectable.
  • the socket wrench 140 has, for example, a square coupling with bevelled edges, which is arranged on a suitable polygonal outer receptacle (451 in FIGS. 2 and 3) of the tool receptacle 450.
  • a socket wrench is sufficiently known from the prior art, so that is omitted here for the sake of scarcity of the description to a detailed description.
  • FIG. 2 shows the detail 150 of FIG. 1 with the gear mechanism 118 and the mechanical percussion mechanism 200 of FIG. 1 in connection with the output shaft 400 in accordance with a first embodiment.
  • the mechanical percussion mechanism 200 as described with reference to FIG. drive 1 18 connected drive body 300, in the illustratively two impactors 210, 220 are arranged.
  • the transmission 118 is a reduction gear
  • the z. B. is designed in the manner of a planetary gear and may have one or more planetary stages.
  • the planetary gear 118 has a single planetary stage 201 with a sun gear 203, planetary gears 204, 205 and a planet carrier 207.
  • the sun gear 203 is drivable by the drive member 119 of FIG. 1, which is rotatably connected to the motor shaft 1 16 or formed on this or can be formed integrally with this.
  • the sun gear 203 and the drive element 119 are preferably also integrally formed.
  • the planet gears 204, 205 are arranged in a ring gear, which is not shown for the sake of simplification of the drawing and z. B. rotatably in the tool housing 110 or the housing 180 of FIG. 1 is arranged.
  • the planet carrier 207 is illustratively connected to the drive member 120 and preferably integrally formed thereon or formed integrally therewith. According to one embodiment, the planet carrier 207 forms a front region 270 of the drive member 120. This front region 270 is designed as an example plate-shaped and flange-like and provided with a fastening device 240. On a - in Fig. 2 - axial side of the front portion 270 has a recess 470 for supporting the output shaft 400 is formed and on the opposite axial side of the front, flange-like portion 270 in a central, cylindrical portion 271 of the drive member 120 via.
  • the bearing pins 278, 279 are z. B. in cylindrical openings 272, 274 and recesses 262, 264 rotatably mounted, so that by rotation of the planetary gears 204, 205 in the ring gear, not shown, a rotation of the drive member 120 can be effected.
  • the central region 271 extends into a rear, annular region 272 of the drive member 120, which illustratively forms a cavity 289 for receiving the sun gear 203 and the drive element 119.
  • the drive member 120 and its planet carrier 207 is rotatably connected to this as described above for the rotary drive of the drive body 300.
  • the drive body 300 has by way of example a counter-fastening device 340 cooperating with the fastening device 240 of the planetary carrier 207.
  • the fastening device 240 and the counter-fastening device 340 together form, for example, B. a press connection. It should be noted, however, that other types of connection are possible, for. B. threaded, clamping, latching or tooth-tooth gaps connections that allow a rotationally fixed connection between the planet carrier 207 and drive body 300. Further alternative fastening means for the rotationally fixed attachment of the drive member 120 to the drive body 300 are described by way of example in FIG.
  • the output shaft 400 has a shaft body 250 provided with an annular shoulder 255, which has an outer periphery 405.
  • the output cam assembly 410 which has at least one and preferably two output cam 412, 422, and the tool holder 450 of FIG. 1 are provided.
  • the output cams 412, 422 are illustratively formed on the outer circumference 405 of the output shaft 400 as radially outward extensions 414, 424.
  • An exemplary embodiment of the output cams 412, 422 is shown in FIGS. 3 to 5.
  • the tool holder 450 has a polygonal outer receptacle 451, preferably a square outer receptacle, which is provided in the radial direction with four preferably planar side surfaces which are connected to one another via bevelled edges.
  • the output shaft 400 is at least partially enclosed by the drive body 300 according to an embodiment.
  • This is exemplified cup-shaped and has at a first axial end 351 on a cup bottom-like wall 350 which is provided with an opening 360.
  • the drive body 300 has an opening 305, on which the counter-fastening device 340 is formed.
  • the drive body 300 has an inner circumference or an inner wall 310 and forms an inner space 320 in which the shaft body 250 with the two output cams 412, 422 of the output shaft 400 up to that provided on this Ring shoulder 255 is arranged so that the output shaft 400 is rotatably but axially immovably disposed in the drive body 300.
  • the annular shoulder 255 is exemplified at least in sections against the pot bottom-like wall 350.
  • the impactors 210, 220 are non-rotatably connected to the drive body 300, but slidably disposed in the radial direction of the drive body 300 and preferably at least substantially immovably within the interior 320 in its axial direction.
  • the impactors 210, 220 illustratively each have an opening 215 and 225, respectively, through which the output shaft 400 passes.
  • the drive cam 212 of the impactor 210 is formed as a radially inwardly directed bulge 312.
  • the impactor body 210 is supported via an associated spring element 218 on the inner circumference 310 of the drive body 300 such that the spring element 218 acts on the radially inwardly directed recess 312 of the impactor body 210 with a predetermined pressure force in the direction of the output shaft 400 or the associated output cam 412.
  • the drive cam 222 of the impactor 220 is also exemplified as a radially inwardly directed bulge 314.
  • the impactor 220 is also supported via an associated spring element 228 on the inner circumference 310 of the drive body 300 such that the spring element 228 acts on the radially inwardly directed recess 314 of the impact body 220 with a predetermined pressure force in the direction of the output shaft 400 or the associated output cam 422 ,
  • FIG. 3 shows an exploded view of the arrangement of FIG. 2 with the drive body 300, the output shaft 400, the impact members 210, 220 and the drive member 120.
  • FIG. 3 shows the exemplary embodiment of the output cams 412, 422 on the outer circumference 405 of the output shaft 400 as radially outwardly directed extensions 414, 424 and the drive cam 212, 222 in the openings 215, 225 of the impactors 210 and 220 as radially inwardly directed bulges 312 and 314 illustrates.
  • the drive body 300 has in its inner space 320 at least one guide recess 499 formed with a quadrangular cross-section, which illustratively has two guide walls 497, 498 aligned substantially parallel to one another.
  • the drive body 300 has, by way of example, two driving cutouts 397, 398, on which associated, axially aligned fastening bores are provided.
  • the driving recess 398 has an axial mounting hole 391.
  • the impactors 210, 220 each have, for example, a cuboid shape with a quadrangular cross-section and at least two substantially parallel aligned side walls 382, 384, and 386, 388, respectively. These side walls 382, 384, and 386, 388 illustratively form the longitudinal sides of the impactors 210, 220. Perpendicular thereto, wide sides 381, 387, referred to below as “foot sides”, and broad sides 383, 385, referred to below as “head sides”, are arranged , On the lying in the region of the drive cam 212, 222 head sides 383, 385 recesses for supporting the spring elements 218 and 228 are formed.
  • the drive member 120 has one or more drivers, which are exemplified stepwise formed on the planet carrier 207 and each having an associated axial mounting hole.
  • the drive member 120 has two drivers 348, 349, wherein the driver 348 has a mounting hole 393 by way of example.
  • the planetary gears 204, 205 with the bearing pins 278 and 279 fixed to the drive member 120, the driver 348, 349 are then arranged in the driving recesses 398 and 397. Finally, the drivers 348, 349 are secured in the driving recesses 398 and 397, z. B. with
  • Rivets or screws 392 and 394 wherein z. B. the rivet or screw 392 engages through the mounting hole 393 in the mounting hole 391.
  • FIG. 4 shows the drive body 300 of FIG. 2 with the guide recess 499, in which the provided with the drive cams 212, 214 striker 210 and
  • the impactors 210, 220 are respectively slidably mounted on the guide walls 498 and 497 of the guide recess 499 on two substantially parallel side walls 382, 384 and 386, 388 (FIG. 3).
  • the spring elements 218 and 228 acting on the striking elements 210, 220 in the direction of the output shaft 400 are illustratively fixed on the driving body 300 in associated recesses 448 or 495 and on the striking bodies 210, 220 in corresponding recesses 418 and 395, respectively (FIG. 3).
  • the drive member 120 of FIGS. 1 and 2 rotatably drives the drive body 300.
  • a rotational movement of the drive member 120, z. B. in the direction of an arrow 401 transmitted via the drive body 300 and the impactor 210, 220 to the output shaft 400.
  • FIG. 5 shows the arrangement of FIG. 4, in which the impactors 210, 220 have been further rotated by the drive body 300 in the direction of the arrow 401.
  • the drive cams 212, 222 slide on the outer circumference 405 of the output shaft 400 and along the associated output cams 412, 422, the force exerted by the impact members 210, 220 on the associated spring elements 218 and 228, respectively, increasing.
  • the spring elements 218, 228 are increasingly compressed until the drive cams 212, 222 have arrived at corresponding reversal points 442 and 444 of the output cams 412 and 422, whereupon the drive cams 212, 222 extend through extension of the spring elements 218 and 228 via the reversal points 442 , 444 slipping and the striking bodies 210 and 220 are accelerated with a comparatively large torque against the output cams 412 and 422, and thus perform against this a sliding rotary impact. Subsequently, the process described above is repeated.

Landscapes

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

Abstract

L'invention concerne une machine-outil à main pourvue d'un organe de percussion mécanique (200) qui présente au moins un corps de percussion (210, 220) pourvu d'une came d'entraînement (212, 222) et un arbre de sortie (400) qui est pourvu d'au moins une came menée (412, 422) et qui est relié à un logement d'outil (450) destiné à loger un outil, la came d'entraînement (212, 222) étant conçue pour entraîner par percussion la came menée (412, 422) lors du fonctionnement de l'organe de percussion mécanique (200). L'arbre de sortie (400) peut être entraîné par un corps d'entraînement (300) en forme de pot qui entoure au moins en partie l'arbre de sortie (400), ledit corps de percussion (210, 220) étant placé de manière axialement déplaçable dans le corps d'entraînement (300) et présentant une ouverture (215, 225) que traverse l'arbre de sortie (400).
EP11785695.5A 2010-12-14 2011-11-23 Machine-outil à main pourvue d'un organe de percussion mécanique Withdrawn EP2651604A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201010063080 DE102010063080A1 (de) 2010-12-14 2010-12-14 Handwerkzeugmaschine mit einem mechanischen Schlagwerk
PCT/EP2011/070751 WO2012079932A1 (fr) 2010-12-14 2011-11-23 Machine-outil à main pourvue d'un organe de percussion mécanique

Publications (1)

Publication Number Publication Date
EP2651604A1 true EP2651604A1 (fr) 2013-10-23

Family

ID=45002972

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11785695.5A Withdrawn EP2651604A1 (fr) 2010-12-14 2011-11-23 Machine-outil à main pourvue d'un organe de percussion mécanique

Country Status (3)

Country Link
EP (1) EP2651604A1 (fr)
DE (1) DE102010063080A1 (fr)
WO (1) WO2012079932A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014209398A1 (de) * 2014-05-19 2015-11-19 Robert Bosch Gmbh Schlagkörper für ein mechanisches Drehschlagwerk

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2514914A (en) * 1945-08-06 1950-07-11 Reed Roller Bit Co Impact wrench
DE4343582A1 (de) * 1993-12-21 1995-06-22 Bosch Gmbh Robert Impulsschlagwerk, insbesondere für Impulsschrauber
DE4427452A1 (de) * 1994-08-03 1996-02-08 Bosch Robert Gmbh & Co Kg Schrauber und Verfahren zum Anziehen einer Schraubverbindung mittels des Schraubers
US6527061B2 (en) * 2001-08-06 2003-03-04 Hale Liao Driving mechanism for pneumatic tools
DE202006014850U1 (de) 2006-09-27 2006-11-23 Robert Bosch Gmbh Mechanisches Schlagwerk
SE530329C2 (sv) * 2006-10-13 2008-05-06 Atlas Copco Tools Ab Slående mutterdragare med smord slagmekanism
CN201437237U (zh) * 2009-07-10 2010-04-14 海峰机械工业股份有限公司 旋转冲击工具头

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2012079932A1 *

Also Published As

Publication number Publication date
WO2012079932A1 (fr) 2012-06-21
DE102010063080A1 (de) 2012-06-14

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