EP2684645A2 - Clé à chocs dotée d'un mécanisme de percussion - Google Patents

Clé à chocs dotée d'un mécanisme de percussion Download PDF

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Publication number
EP2684645A2
EP2684645A2 EP13172429.6A EP13172429A EP2684645A2 EP 2684645 A2 EP2684645 A2 EP 2684645A2 EP 13172429 A EP13172429 A EP 13172429A EP 2684645 A2 EP2684645 A2 EP 2684645A2
Authority
EP
European Patent Office
Prior art keywords
switching
rotary impact
impact wrench
operating parameter
sensor
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Withdrawn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
EP13172429.6A
Other languages
German (de)
English (en)
Other versions
EP2684645A3 (fr
Inventor
Falk Herrmann
Nils Schoeche
Swee Ping Kuek
Sim Teik Yeoh
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 EP2684645A2 publication Critical patent/EP2684645A2/fr
Publication of EP2684645A3 publication Critical patent/EP2684645A3/fr
Withdrawn legal-status Critical Current

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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
    • 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
    • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
    • B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
    • B25B23/147—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for electrically operated wrenches or screwdrivers
    • B25B23/1475—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for electrically operated wrenches or screwdrivers for impact wrenches or screwdrivers

Definitions

  • the present invention relates to a rotary impact driver with a striking mechanism for the impact drive of an output shaft and with an operating mode switching element for switching between a non-impact operation and a striking operation of the impact mechanism.
  • Such a rotary impact wrench which has a tool housing in which a provided with a striker mechanical percussion is arranged. Associated with this mechanical percussion mechanism is an operating mode switching element which serves to toggle the percussion mechanism between non-impact operation and impact operation.
  • the operating mode switching element comprises a switching shaft, which is displaceable axially between a first and a second position by actuating a rotatably mounted on the tool housing and the operating mode switching element associated actuating sleeve, wherein the first position is assigned to the non-impact operation and the second position the beating operation of the impact mechanism ,
  • a disadvantage of the prior art is that during operation of such a rotary impact wrench, z. B. when screwing a screw in an associated object, in a delayed switching from non-impact operation in the beating operation of the percussion damage to the screw head of the screw by turning a corresponding insert tool, z. B. a screwdriver bit, can occur on the screw head. As a result, a complete screwing the screw difficult or even prevented.
  • An object of the invention is therefore to provide a new impact wrench with a striking mechanism, in which a determination of a suitable switching time for switching between an associated non-impact operation and a beating operation of the impact mechanism is made possible.
  • a rotary impact wrench with a striking mechanism for the striking drive of an output shaft and with an operating mode switching element for switching between a non-impact operation and a beating operation of the impact mechanism.
  • a sensor element is provided, which is designed to detect an operating parameter of the rotary impact wrench, which can be evaluated to determine a switching time for switching from non-striking to the striking operation of the impact mechanism.
  • the invention thus enables the provision of a rotary impact wrench, in which a safe and reliable determination of a suitable switching time for switching the impact mechanism between an associated non-impact operation and a beating operation is made possible.
  • a control unit for evaluating the detected operating parameter and for determining the switching instant on the basis of the evaluated operating parameter.
  • an output unit is provided, which can be controlled by the control unit when determining the switch-over time, at least for the purpose of outputting a switch-over recommendation.
  • a user of the rotary impact wrench can be provided in a simple manner a switching recommendation for manual switching from non-impacting to the striking operation of the impact mechanism.
  • control unit is designed to control the operating mode switching element in order to enable automated switching from non-striking to striking operation of the percussion mechanism.
  • the invention thus enables the provision of a rotary impact wrench, in which a simplified, more comfortable handling by a user is made possible by an automation of switching from non-impacting to the striking operation of the striking mechanism.
  • the switching time is preferably determined in the event that the operating parameter exceeds a predetermined threshold.
  • the sensor element has a current sensor, wherein the operating parameter is a motor current flowing in an associated drive motor.
  • the invention thus makes it possible to provide a rotary impact wrench in which a simple and inexpensive component can be used for the realization of the sensor element.
  • the sensor element has a torque sensor, wherein the operating parameter is a torque generated by an associated transmission.
  • the sensor element has a speed sensor, wherein the operating parameter is a rotational speed of a motor shaft of an associated drive motor.
  • the invention thus makes it possible to provide a rotary impact wrench in which a robust and reliable component can be used for the realization of the sensor element.
  • the sensor element has a position sensor, wherein the operating parameter is an operating position of a manual switch for actuating the rotary impact wrench.
  • a non-contact detection of the operating parameter can be realized in a simple manner, wherein the position sensor can be arranged in the rotary impact wrench, without requiring an increase in its space.
  • the sensor element has an acceleration sensor, wherein the operating parameter is a rotational and / or longitudinal acceleration of an associated tool housing.
  • the invention thus makes it possible to provide a rotary impact wrench, in which a secure and reliable, non-contact detection of the operating parameter as well as a compact design can be made possible.
  • Fig. 1 shows a rotary impact wrench 100 provided with a tool holder 150 and a striking mechanism 122, which has a tool housing 110 with a handle 126.
  • the Rotary impact wrench 100 for mains-independent power supply mechanically and electrically connectable to a battery pack 130.
  • the rotary impact driver 100 is exemplified as a cordless impact wrench. It should be noted, however, that the present invention is not limited to cordless rotary impact wrenches, but rather can be generally applied to rotary impact wrenches, regardless of whether they are electrically, d. H. mains-independent with a battery pack or network-dependent, or non-electrically operated.
  • electric drive motor 114 In the tool housing 110 illustratively powered by the battery pack 130, electric drive motor 114, a gear 118 and the impact mechanism 122 are arranged.
  • the drive motor 114 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 116 to the transmission 118, which is a rotation of the motor shaft 116 in rotation of a provided between the gear 118 and percussion gear 122 drive member 120, for. B. a drive shaft, converts. 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 114 is illustratively arranged in a motor housing 115 and the gear 118 in a gear housing 119, wherein the gear housing 119 and the motor housing 115 are arranged in the tool housing 110 by way of example.
  • the striking mechanism 122 connected to the drive shaft 120 is exemplified by a rotary impact mechanism provided with a striking body 125 which generates high-intensity sudden turning impulses and is transmitted via the striking body 125 to the output shaft 124, e.g. B. an output spindle transmits.
  • the tool holder 150 is provided, the is preferably designed for receiving insert tools and illustratively in the manner of a so-called bit holder, in the example provided with an external polygon coupling 142 insert tool 140, z. B. a so-called screwdriver bit is arranged.
  • the tool holder 150 according to an embodiment also or alternatively thereto with an insert tool with polygon socket coupling, z. B.
  • a so-called socket wrench be connected.
  • An exemplary tool holder, with which the tool holder 150 can be realized is in the DE 10 2010 002 353 A1 to which reference is expressly made and the teachings of which are to be understood as a part of the present description, so that a detailed description of the tool holder 150 can be omitted here for the sake of brevity of the description.
  • suitable screwdriver bits or socket wrenches are sufficiently known from the prior art, so that here for the sake of conciseness of the description is also dispensed with a detailed description of these components.
  • the striking mechanism 122 is formed in the manner of a mechanical impact mechanism 122, wherein the impactor 125 z. B. longitudinally displaceable and at least partially rotatably mounted on the drive shaft 120 and there is spring-loaded in the direction of the output shaft 124.
  • the hammer mechanism 122 in a separate impact mechanism housing or other suitable housing, for. B. the gear housing 119 or the tool housing 110 may be arranged.
  • striking mechanism 122 is arranged directly in tool housing 110.
  • An exemplary mechanical striking mechanism, with which the impact mechanism 122 can be realized, is in the DE 20 2006 014 850 U1 which is hereby incorporated by reference and whose teachings are to be understood as a part of the present description, so that a detailed description of the percussion mechanism 122 can be omitted here for the sake of brevity of the description.
  • the percussion mechanism 122 is illustratively associated with an operating mode switching element 123 for switching between a non-impact operation and a percussion operation of the percussion mechanism 122.
  • the non-impact operation will hereinafter also be referred to as “normal operation” and the beating operation hereinafter also as “impact operation”.
  • the mode switching element 123 may be configured to be in Normal operation of the percussion gear 122 to block an axial displacement of the impactor 125 in the longitudinal direction of the drive shaft 120, and to allow this in impact mode to allow the generation of sudden angular momentum by the impactor 125.
  • the operating mode switching element 123 may, in operation of the rotary impact wrench 100 at a suitable switching time z. B. be operated manually by a user, for example via a in Fig. 1 indicated, associated annular actuator, or alternatively allow automated switching of percussion 122 between normal and impact mode.
  • a suitable switching time is in the context of the present invention, a time at which switching of percussion 122 should be between normal and impact mode to z. B. to prevent damage to the screw head of the screw by further operation of the rotary impact wrench 100 during normal operation of the percussion mechanism 122 when screwing a screw into an associated object.
  • a sensor element 162 is provided according to one embodiment, which is adapted to detect an operating parameter of the rotary impact wrench 100, which is evaluable for determining the switching time for switching from normal operation to impact mode of the hammer mechanism 122, z. B. from an associated control unit 164.
  • the sensor element 162 and the control unit 164 are associated with an electronic unit 160, which is also assigned by way of example at least one output unit 166.
  • the electronics unit 160 is z. B. formed by a stocked with electronic components circuit board, which may be formed, for example, to control the rotary impact wrench 100 and the drive motor 114.
  • control unit 164 may be configured to control the mode switching element 123 in determining the switching timing to switch from normal operation to percussion operation of the percussion mechanism 122 to enable automated switching between normal and percussion operation of the percussion mechanism 122.
  • control unit 164 is designed at least to control the output unit 166 when determining the switching time for outputting a switching recommendation 168.
  • the switching recommendation 168 is shown as an example as a visual signal, z. B. as lights or flashing of the output unit 166 forming LED's. It should be understood, however, that this specific visual signal is merely exemplary in nature and should not be considered as limiting the invention. Rather, different visual signals can be used, for. B. a user can be displayed an explicit request for switching, for example in text or image form. Alternatively or additionally, for. B. an auditive, tactile and / or other switching recommendation to the user are issued.
  • Fig. 2 shows the electronics unit 160 of Fig. 1 with the sensor element 162 and the control unit 164, which are used to evaluate the operating parameter detected by the sensor element 162 and to determine the changeover time for switching from normal operation to impact operation of the percussion mechanism 122 of FIG Fig. 1 is provided on the basis of the evaluated operating parameter.
  • the control unit 164 is at least configured to determine the switching time in the event that the operating parameter exceeds a predetermined threshold.
  • the threshold value is stored in a memory unit 165 assigned to the electronic unit 160 and can be called up there by the control unit 164.
  • comparison curves can be stored in the memory unit 165, so that instead of a threshold value consideration, for example, a comparison is made.
  • temporal courses of the detected operating parameter for determining the switching time can be compared with associated comparison curves.
  • the rotary impact driver 100 of Fig. 1 assigned parameters are stored, z. As an identification number, etc.
  • the electronics unit 160 is illustratively an output unit 167, e.g. As a display or a speaker, assigned. This is z. B. at least provided to issue a corresponding switching recommendation and can be exemplified to the realization of the output unit 166 of Fig. 1 Find application.
  • the sensor element 162 has a current sensor.
  • the operating parameter detectable by the sensor element 162 is z. B. in the drive motor 114 of Fig. 1 flowing motor current. This increases in the operation of the rotary impact wrench 100 of Fig. 1 if the workload on insert tool 140 of FIG Fig. 1 rises, z. B. in a so-called "hard" screwing.
  • a suitable switching time for switching to the impact mode of the impact mechanism 122 of Fig. 1 be determined, for example, if the motor current exceeds a predetermined threshold.
  • the sensor element 162 has a torque sensor.
  • This also increases in the operation of the rotary impact wrench 100 of Fig. 1 if the workload on insert tool 140 of FIG Fig. 1 rises, so that on the basis of a detection of the torque by means of z. B. in the gear housing 119 of Fig. 1 arranged torque sensor of the control unit 164 is a suitable switching time for switching to the striking operation of the hammer mechanism 122 of Fig. 1 can be determined, for example, if the torque exceeds a predetermined threshold.
  • the sensor element 162 has a speed sensor.
  • the detectable by the sensor element 162 operating parameters z. B. a rotational speed of the motor shaft 116 of the drive motor 114 of Fig. 1 In this case, for example, the normal operation can be switched at low rotational speeds and a determination of the suitable changeover time can take place when a predetermined rotational speed defining a corresponding threshold value is reached.
  • the sensor element 162 has a position sensor.
  • a rotational and / or longitudinal position or an actuating speed assumed by the manual switch 128 when it is actuated can be detected by the position sensor and evaluated to determine the suitable switching time.
  • the sensor element 162 has an acceleration sensor.
  • the detectable by the sensor element 162 operating parameters z. B. a rotational and / or longitudinal acceleration of the tool housing 110 of Fig. 1
  • This can also be a on the insert 140 of Fig. 1 increasing workload by means of z. B. in and / or on the tool housing 110 of Fig. 1 arranged acceleration sensor can be detected, whereupon from the control unit 164, a suitable switching time for switching to the striking operation of the hammer mechanism 122 of Fig. 1 can be determined, for example, if the detected rotational and / or longitudinal acceleration exceeds a predetermined threshold.
  • any sensor element can be used, with which an operating parameter can be detected, which allows a determination of a suitable switching time, regardless of whether a subsequent switching manually by a user or automatically.
  • a rotation angle sensor can be used, with which, as an operating parameter, z. B. a rotation of the output shaft 124 of Fig. 1 is detectable.
  • contactless as well as touch sensors can be used.
  • a switching mechanism for switching the percussion gear 122 from normal operation in the impact mode find application, the switching takes place, for example, when the hand switch 128 of Fig. 1 is actuated beyond a predetermined actuation point or a corresponding actuation position, so that in this case the manual switch 128 as such forms the sensor element 162.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
  • Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
EP13172429.6A 2012-07-09 2013-06-18 Clé à chocs dotée d'un mécanisme de percussion Withdrawn EP2684645A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE201210211910 DE102012211910A1 (de) 2012-07-09 2012-07-09 Drehschlagschrauber mit einem Schlagwerk

Publications (2)

Publication Number Publication Date
EP2684645A2 true EP2684645A2 (fr) 2014-01-15
EP2684645A3 EP2684645A3 (fr) 2017-10-18

Family

ID=48670412

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13172429.6A Withdrawn EP2684645A3 (fr) 2012-07-09 2013-06-18 Clé à chocs dotée d'un mécanisme de percussion

Country Status (3)

Country Link
EP (1) EP2684645A3 (fr)
CN (1) CN103538018A (fr)
DE (1) DE102012211910A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10272550B2 (en) 2016-02-25 2019-04-30 Milwaukee Electric Tool Corporation Power tool including an output position sensor

Families Citing this family (9)

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Publication number Priority date Publication date Assignee Title
DE102015201573A1 (de) * 2015-01-29 2016-08-04 Robert Bosch Gmbh Schlagwerkvorrichtung, insbesondere für einen Schlagschrauber
JP6587110B2 (ja) * 2016-01-14 2019-10-09 工機ホールディングス株式会社 回転打撃工具
EP3501743A1 (fr) 2017-12-20 2019-06-26 HILTI Aktiengesellschaft Procédé de pose pour élément d'ancrage à expansion au moyen de la clé à percussion
EP3756831A1 (fr) * 2019-06-25 2020-12-30 Hilti Aktiengesellschaft Capteur pour détecter une contrainte mécanique sur le bloc-batterie
EP3756830A1 (fr) 2019-06-25 2020-12-30 Hilti Aktiengesellschaft Protection de batterie contre les chutes
EP3758103A1 (fr) 2019-06-25 2020-12-30 Hilti Aktiengesellschaft Détection de contrainte mécanique agissant sur un système
DE102020206741A1 (de) 2020-05-29 2021-12-02 Robert Bosch Gesellschaft mit beschränkter Haftung Verfahren zum Erkennen von Schraubverbindungen
CN115816358A (zh) * 2022-12-19 2023-03-21 锐奇控股股份有限公司 一种电钻防扭手控制装置及控制方法
DE102023212812A1 (de) 2023-12-15 2025-06-18 Robert Bosch Gesellschaft mit beschränkter Haftung Verfahren zum Betreiben einer elektrischen Handwerkzeugmaschine

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DE202006014850U1 (de) 2006-09-27 2006-11-23 Robert Bosch Gmbh Mechanisches Schlagwerk
WO2008101556A1 (fr) 2007-02-23 2008-08-28 Robert Bosch Gmbh Outil électrique rotatif pouvant fonctionner soit dans un mode d'impact soit dans un mode de perçage
DE102010002353A1 (de) 2010-02-25 2011-08-25 Robert Bosch GmbH, 70469 Handwerkzeugmaschine

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JP2001121442A (ja) * 1999-10-29 2001-05-08 Hitachi Koki Co Ltd インパクト工具
DE10303006B4 (de) * 2003-01-27 2019-01-03 Hilti Aktiengesellschaft Handgeführtes Arbeitsgerät
DE102005015900B4 (de) * 2004-04-10 2020-07-09 Marquardt Gmbh Elektrowerkzeug, insbesondere Schlagschrauber
JP4211675B2 (ja) * 2004-05-12 2009-01-21 パナソニック電工株式会社 インパクト回転工具
JP4400519B2 (ja) * 2005-06-30 2010-01-20 パナソニック電工株式会社 インパクト回転工具
DE102009000129A1 (de) * 2009-01-09 2010-07-15 Robert Bosch Gmbh Verfahren zum Einstellen einer Elektrowerkzeugmaschine
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JP2012045665A (ja) * 2010-08-26 2012-03-08 Toyota Motor Corp 打撃式締め付け工具

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Publication number Priority date Publication date Assignee Title
DE202006014850U1 (de) 2006-09-27 2006-11-23 Robert Bosch Gmbh Mechanisches Schlagwerk
WO2008101556A1 (fr) 2007-02-23 2008-08-28 Robert Bosch Gmbh Outil électrique rotatif pouvant fonctionner soit dans un mode d'impact soit dans un mode de perçage
DE102010002353A1 (de) 2010-02-25 2011-08-25 Robert Bosch GmbH, 70469 Handwerkzeugmaschine

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10272550B2 (en) 2016-02-25 2019-04-30 Milwaukee Electric Tool Corporation Power tool including an output position sensor
US10583545B2 (en) 2016-02-25 2020-03-10 Milwaukee Electric Tool Corporation Power tool including an output position sensor
US11484999B2 (en) 2016-02-25 2022-11-01 Milwaukee Electric Tool Corporation Power tool including an output position sensor
US11813722B2 (en) 2016-02-25 2023-11-14 Milwaukee Electric Tool Corporation Power tool including an output position sensor
US12115630B2 (en) 2016-02-25 2024-10-15 Milwaukee Electric Tool Corporation Power tool including an output position sensor
US12485519B2 (en) 2016-02-25 2025-12-02 Milwaukee Electric Tool Corporation Power tool including an output position sensor

Also Published As

Publication number Publication date
DE102012211910A1 (de) 2014-01-09
EP2684645A3 (fr) 2017-10-18
CN103538018A (zh) 2014-01-29

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