EP2242620B1 - Kraftschrauber mit kraftübertragungsgetriebe und drehungserfassungsfunktion sowie statusbestimmungsverfahren dafür - Google Patents

Kraftschrauber mit kraftübertragungsgetriebe und drehungserfassungsfunktion sowie statusbestimmungsverfahren dafür Download PDF

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Publication number
EP2242620B1
EP2242620B1 EP09712893.8A EP09712893A EP2242620B1 EP 2242620 B1 EP2242620 B1 EP 2242620B1 EP 09712893 A EP09712893 A EP 09712893A EP 2242620 B1 EP2242620 B1 EP 2242620B1
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EP
European Patent Office
Prior art keywords
output spindle
motor
sensing means
power
rotational movement
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.)
Active
Application number
EP09712893.8A
Other languages
English (en)
French (fr)
Other versions
EP2242620A4 (de
EP2242620A1 (de
Inventor
Karl Johan Lars Elsmark
Erik Vilhelm Persson
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.)
Atlas Copco Industrial Technique AB
Original Assignee
Atlas Copco Industrial Technique AB
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Publication date
Application filed by Atlas Copco Industrial Technique AB filed Critical Atlas Copco Industrial Technique AB
Publication of EP2242620A1 publication Critical patent/EP2242620A1/de
Publication of EP2242620A4 publication Critical patent/EP2242620A4/de
Application granted granted Critical
Publication of EP2242620B1 publication Critical patent/EP2242620B1/de
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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
    • 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
    • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
    • B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
    • 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
    • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
    • B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
    • B25B23/1405—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers for impact wrenches or screwdrivers
    • 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
    • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
    • B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
    • B25B23/142—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for hand operated wrenches or screwdrivers
    • B25B23/1422—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for hand operated wrenches or screwdrivers torque indicators or adjustable torque limiters
    • B25B23/1425—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for hand operated wrenches or screwdrivers torque indicators or adjustable torque limiters by electrical means

Definitions

  • the invention relates to a power nutrunner with an electric rotation motor connected to an output spindle via a power transmitting gearing.
  • torque sensing means for indicating the torque delivered to a screw joint being tightened.
  • this torque sensing means is of a mechanical-electric type associated with the reduction gearing or in the case of an electrically powered tool incorporated in the electric motor drive to detect the motor current/torque.
  • the torque sensing means is associated with the output spindle and gives a fairly correct signal in relation to the actually delivered torque, because in these cases the torque signal is not disturbed by occurring deficiencies of the reduction gearing.
  • An example of such power nutrunner is known from DE19637934 .
  • torque sensing means located at the output spindle in angle nutrunners might give a reliable torque signal but is disadvantageous as the torque sensing means requires some space and causes a bulky angle head. This results in an impaired accessibility of the nutrunner.
  • torque sensing means located "upstream" of the reduction gearing particularly nutrunners having an angle gear
  • there may be considerable disturbances between the "upstream” torque sensing means and the output spindle such that the torque actually delivered to the screw joint may deviate considerably from that indicated by the torque sensing means.
  • the output angular speed and subsequently the output torque from an angle gear is by nature to some extent sinusoidal due to the sequential gear teeth engagement. This results in a non-linear torque growth in the screw joint being tightened.
  • Another source of torque sensing error is a certain elastic torsional deformation of the transmission parts and the output spindle which influences upon the rotation angle as well as the registration dynamics, service life and the installed torque.
  • One way of ensuring an acceptable output torque accuracy is to keep track on the status of the power transmitting gearing and to be able to decide when the gearing is mechanical worn down to such an extent that an overhaul or repair of the tool is necessary.
  • a worn down gearing results in impaired output performance of the tool, and the output torque of the nutrunner may no longer be what it was originally set to be, which means that screw joints tightened by the nutrunner may not be tightened to an acceptable pretension level.
  • the main object for the invention is to provide a power nutrunner with a motor arranged to deliver torque to an output spindle via a gearing and comprising a means for indicating the rotational movement of the output spindle to thereby detect excessive mechanical wear or any other damages of the gearing resulting in unacceptable deviations of the output torque, and also to detect the amount of elastic yield of the power transmission, thereby, determining the angular lag of the output spindle in relation to the motor.
  • the nutrunner front section shown in Fig. 1 comprises a housing 10 which is connectable to a non-illustrated rear section of the nutrunner including a rotation motor and power feed means connected to the motor.
  • This front section housing 10 comprises an angle head 11 with an output spindle 12 journalled in a forward ball bearing 13 and a rear needle bearing 14.
  • the output spindle 12 is formed with an output end 15 for carrying a nut sleeve for connection to a screw joint to be tightened.
  • the forward ball bearing 13 has one of its ball races formed directly on the output spindle 12, whereas the other ball race is formed on an end cover 17 threaded into the forward end of the angle head 11.
  • the output spindle 12 is connected to the motor via an angle gearing 18 and an intermediate shaft 19, wherein the angle gearing 18 includes a pinion gear 20 on the intermediate shaft 19 and a bevel gear 21 on the output spindle 12.
  • the intermediate shaft 19 is journalled in a rear adjustable ball bearing 22 and a forward needle bearing 23 and provided at its rear end with a coupling sleeve 24 for connection to the motor.
  • a rotation sensing means in the form of a Hall-element type sensor 26 secured in the angle head 11 and an activator 27 associated with the output spindle 12.
  • the activator 27 is preferably formed as a thin plastic strip 29 attached around the bevel gear 21 and magnetised in transverse equidistantly placed parallel bands. These magnetic bands are very narrow for a high resolution and arranged to accomplish a pulsing activation of the sensor 26.
  • the sensor 26 is connected to a non-illustrated electronic control and evaluation unit preferably located at the rear end of the nutrunner, and the sensor 26 will deliver electric pulses to that unit in response to the magnetic bands 29 pass it during rotation of the output spindle 12.
  • the output spindle 12 could as well be provided with a circumferential row of teeth to activate an inductive sensor located in the angle head.
  • Other types of rotation sensing means may also be used.
  • a power nutrunner having a housing (10,11) with an electric rotation motor, a power transmitting gearing (18), and an output spindle (12), wherein a rotation sensing means (26,27) is associated with the output spindle (12) and arranged to deliver equidistantly generated pulse signals to an evaluation unit to detect undesirable irregularities in the rotational movement of the output spindle (12) caused by deficiencies of the gearing (18).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)

Claims (3)

  1. Kraftschrauber, umfassend ein Gehäuse (10,11), einen Elektrodrehmotor und eine Abtriebsspindel (12), der über ein Kraftübertragungsgetriebe (18) an den Motor gekoppelt und angepasst ist, ein in eine Schraubverbindung eingreifendes Arbeitsmittel zu tragen, wobei ein Drehsensormittel (26, 27) angeordnet ist, Signale zu erzeugen, die die momentane Drehbewegung der Abtriebsspindel (12) angeben, dadurch gekennzeichnet, dass eine Bewertungseinheit an das Drehsensormittel (26, 27) angeschlossen und angepasst ist, den aktuellen Status des Kraftübertragungsgetriebes (18) durch Erfassen und Analysieren unerwünschte Unregelmäßigkeiten in der Drehbewegung der Abtriebsspindel (12) zu bestimmen, wobei eine elektronische Stromversorgung und eine Steuereinheit, umfassend Mittel, die an den Motor angeschlossen sind, und das Drehsensormittel (26, 27) angeordnet ist, das Ausgangsdrehmoment und die Drehbewegung des Motors zu bestimmen, und wobei die Bewertungseinheit in der Versorgungs- und Steuereinheit vorgesehen und angeordnet ist, die Drehbewegung des Motors mit der Drehbewegung der Abtriebsspindel (12) zu vergleichen, um einer Winkelverzögerung der Abtriebsspindel (12) in Bezug zum Motor zu erkennen.
  2. Kraftschrauber nach Anspruch 1, wobei das Drehsensormittel (26, 27) ein pulserzeugendes Betätigungselement (27), das der Abtriebsspindel (12) zugehörig ist, und einen stationären Sensor (26), der in dem Gehäuse (10, 11) montiert und angeordnet ist, elektrische Pulse zu liefern, die abstandsgleich von dem Betätigungselement (27) bei der Drehung der Abtriebsspindel (12) erzeugt werden, umfasst.
  3. Kraftschrauber nach Anspruch 2, wobei das Kraftübertragungsgetriebe (18) ein Winkelgetriebe mit einem Kegelrad (21) umfasst, das auf der Abtriebsspindel (12) gelagert ist, und das Betätigungselement (27) auf dem Kegelrad (21) gelagert ist.
EP09712893.8A 2008-02-20 2009-02-19 Kraftschrauber mit kraftübertragungsgetriebe und drehungserfassungsfunktion sowie statusbestimmungsverfahren dafür Active EP2242620B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0800385A SE532128C2 (sv) 2008-02-20 2008-02-20 Mutterdragare med en kraftöverförande växel och rotationsavkännande organ, samt metod för fastställande växelns status
PCT/SE2009/000095 WO2009105008A1 (en) 2008-02-20 2009-02-19 Power nutrunner with a power transmitting gearing and rotation sensing means and method for determining the status

Publications (3)

Publication Number Publication Date
EP2242620A1 EP2242620A1 (de) 2010-10-27
EP2242620A4 EP2242620A4 (de) 2013-09-18
EP2242620B1 true EP2242620B1 (de) 2016-04-20

Family

ID=40985757

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09712893.8A Active EP2242620B1 (de) 2008-02-20 2009-02-19 Kraftschrauber mit kraftübertragungsgetriebe und drehungserfassungsfunktion sowie statusbestimmungsverfahren dafür

Country Status (5)

Country Link
EP (1) EP2242620B1 (de)
JP (1) JP5771395B2 (de)
CN (1) CN101939141B (de)
SE (1) SE532128C2 (de)
WO (1) WO2009105008A1 (de)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105848833B (zh) * 2013-12-27 2018-03-20 阿特拉斯·科普柯工业技术公司 动力工具
JP7080814B2 (ja) * 2015-12-11 2022-06-06 アトラス・コプコ・インダストリアル・テクニーク・アクチボラグ アングル駆動装置付きパワーレンチ
SE539112C2 (en) * 2015-12-14 2017-04-11 Atlas Copco Ind Technique Ab Impulse wrench rotation detection
US10160106B2 (en) 2016-04-24 2018-12-25 Toyota Motor Engineering & Manufacturing North America, Inc. Programmable tool orientation based, assembly tightening control
CN110730704A (zh) * 2017-06-12 2020-01-24 阿特拉斯·科普柯工业技术公司 带有角传动的动力扳手
CN111300325B (zh) * 2020-04-17 2021-09-14 湖南省东海五金工具制造有限公司 一种辅助式扳手

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4043222A (en) * 1973-05-14 1977-08-23 Thor Power Tool Company Housing construction for a power tool
US4844177A (en) * 1987-08-07 1989-07-04 The Aro Corporation Torque sensing, automatic shut-off and reset clutch for toggle controlled screwdrivers, nutsetters and the like
JPH05134769A (ja) * 1991-11-14 1993-06-01 Teijin Seiki Co Ltd トルク制御型アクチユエータ
DE19637934A1 (de) * 1996-09-17 1998-03-26 Psm Drucklufttechnik Vertrieb Winkelschrauber mit eingebautem Drehmomentgeber
DE20111326U1 (de) * 2001-07-07 2001-09-27 Wagner Paul Heinz Hydraulischer Kraftschrauber
JP4493920B2 (ja) * 2003-02-05 2010-06-30 株式会社マキタ 締付工具
JP4421193B2 (ja) * 2003-02-14 2010-02-24 株式会社マキタ 締付工具
JP2005118910A (ja) * 2003-10-14 2005-05-12 Matsushita Electric Works Ltd インパクト回転工具
JP4906236B2 (ja) * 2004-03-12 2012-03-28 株式会社マキタ 締付工具
JP2005351683A (ja) * 2004-06-09 2005-12-22 Makita Corp 締付工具とその管理装置とそれらのセット
JP3975299B2 (ja) * 2004-07-08 2007-09-12 前田金属工業株式会社 締付トルク測定ユニット及びトルク表示締付機
JP2007229853A (ja) * 2006-02-28 2007-09-13 Nitto Seiko Co Ltd ねじ締めドライバユニット

Also Published As

Publication number Publication date
JP5771395B2 (ja) 2015-08-26
WO2009105008A1 (en) 2009-08-27
JP2011512266A (ja) 2011-04-21
EP2242620A4 (de) 2013-09-18
CN101939141B (zh) 2012-10-31
CN101939141A (zh) 2011-01-05
EP2242620A1 (de) 2010-10-27
SE0800385L (sv) 2009-08-21
SE532128C2 (sv) 2009-10-27

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