EP4353418B1 - Drehmomenterfassungsanordnung für ein elektrowerkzeug - Google Patents

Drehmomenterfassungsanordnung für ein elektrowerkzeug

Info

Publication number
EP4353418B1
EP4353418B1 EP22201613.1A EP22201613A EP4353418B1 EP 4353418 B1 EP4353418 B1 EP 4353418B1 EP 22201613 A EP22201613 A EP 22201613A EP 4353418 B1 EP4353418 B1 EP 4353418B1
Authority
EP
European Patent Office
Prior art keywords
bushing
power
disposed
power tool
torque
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
EP22201613.1A
Other languages
English (en)
French (fr)
Other versions
EP4353418A1 (de
Inventor
Yi-Min Wu
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.)
Matatakitoyo Tool Co Ltd
Original Assignee
Matatakitoyo Tool Co Ltd
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 Matatakitoyo Tool Co Ltd filed Critical Matatakitoyo Tool Co Ltd
Priority to EP22201613.1A priority Critical patent/EP4353418B1/de
Publication of EP4353418A1 publication Critical patent/EP4353418A1/de
Application granted granted Critical
Publication of EP4353418B1 publication Critical patent/EP4353418B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • 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
    • B25B23/147—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for electrically operated wrenches or screwdrivers

Definitions

  • This disclosure relates to a power tool, and more particularly relates to a power tool including a torque sensing arrangement.
  • a power tool provided with a torque sensor in the related art may be used to detect the torque.
  • the torque sensor transmits a signal to control the power device to stop when the predetermined torque is reached.
  • the torque sensor of a power tool is usually installed on the transmission mechanism.
  • the torque sensor is situated in a rotating state for a long time with the operation of the transmission mechanism. Hence, problems such as broken wires and contact failures may occur which will affect the electrical connection and may cause damage to the power tool. Additionally, the transmission mechanism connected to the tool head may be vibrated or deformed when the power tool is in operation. Thus, the torque value detected by the torque sensor may be affected, and the accuracy of the torque sensor is reduced.
  • EP 2497607 A1 discloses a power tool according to the preamble of claim 1, including a torque post disposed in the handle of the power tool and arranged perpendicularly to the power body, and a torque sensor.
  • the torque sensor arrangement includes a first sensor that detects the torque of the tool bit and a second sensor that detects motion of the tool body.
  • the first sensor is disposed on a driven-side member, and the second sensor is disposed is mounted on a controller of the power tool.
  • the torque post does not comprise a platform that is connected to the base and disposed in the handle between the base of the torque post and a bushing or power body.
  • the torque sensor is not disposed on a side surface of such a platform, as the first sensor is mounted directly adjacent the outer surface of the torque post, whereas the second sensor is disposed far away from the torque post, namely on the controller.
  • the power tool according to the present disclosure includes the torque post and the torque sensor disposed in the handle of the housing, so that the torque sensor may not rotate with the power device. Therefore, problems such as broken wires and contact failures may be avoided and the convenience of assembly is increased.
  • the torque post disposed in the handle is arranged perpendicularly to the power body. Therefore, the torque detection may not be affected by the vibration of the power body, and an accurate torque value is provided to increase the practicality of this disclosure.
  • FIG 1 to FIG 3 are a perspective schematic view of the power tool in this disclosure, a perspective schematic view and a perspective exploded schematic view of the torque sensing arrangement of the power tool in this disclosure.
  • This disclosure is a torque sensing arrangement of a power tool.
  • the power tool 1 includes a housing 10, a power device 20, a bearing set 30, a torque post 40 and a torque sensor 50.
  • the power device 20 is installed in the housing 10.
  • the bearing set 30 is disposed between the power device 20 and the housing 10.
  • the torque post 40 is combined with the torque sensor 50 and disposed perpendicularly to the power device 20.
  • the torque value of the power tool 1 is detected through the torque sensor 50, and the operation of the power device 20 is controlled accordingly.
  • the structure of the power tool 1 and the torque sensing arrangement are described in more detail as follows.
  • the housing 10 includes a main body 11 and a handle 12 perpendicularly connected to one side of the main body 11.
  • the housing 10 is in a T-shape.
  • the power device 20 is disposed in the main body 11.
  • the power device 20 includes a power body 21 and a bushing 22 adapted to sheathe the power body 21.
  • the power body 21 is provided with a driving shaft 211.
  • the power body 21 is an electric motor, which uses a battery as a power source to drive the driving shaft 211 to rotate.
  • the power body 21 may be a pneumatic motor, which uses compressed air as a power source to drive the driving shaft 211 to rotate.
  • the bearing set 30 is arranged between the bushing 22 and the housing 10. Therefore, the power body 21 (with the bushing 22) may rotate relative to the housing 10.
  • an outer annular rib 220 is formed on an outer surface of the bushing 22.
  • the bushing 22 has a bushing front side 221 and a bushing rear side 222 opposite to each other.
  • An end edge of the bushing front side 221 is provided with a plurality of front pawls 2211, and an end edge of the bushing rear side 222 is provided with a plurality of rear pawls 2221.
  • the power device 20 further includes a pair of motor fixing pieces 23.
  • the pair of motor fixing pieces 23 includes a front fixing piece 231 and a rear fixing piece 232 disposed on two sides of the bushing 22 opposite to each other.
  • a plurality of front tabs 2311 are arranged spacedly on a periphery of the front fixing piece 231.
  • a plurality of rear tabs 2321 are arranged spacedly on a periphery of the rear fixing piece 232.
  • the power device 20 further includes a plurality of locking members 24.
  • the front fixing piece 231 is provided with a plurality of first locking holes 2310, and the power body 21 is correspondingly provided with a plurality of second locking holes 210.
  • the front fixing plate 231 is fixed on the power body 21 through the locking members 24 passing through the first locking holes 2310 and the second locking holes 210.
  • the front fixing piece 231 is positioned on one end of the bushing front side 221 through the front tabs 2311 being engaged with the front pawls 2211 of the bushing 22.
  • the rear fixing piece 232 is positioned on one end of the bushing rear side 222 of the bushing 22 through the rear tabs 2321 being engaged with the rear pawls 2221 of the bushing 22.
  • the bearing set 30 includes a front bearing 31 and a rear bearing 32 arranged on two sides of the outer annular rib 220. Furthermore, the torque post 40 is disposed in the handle 12 to abut against the bushing 22, and the torque post 40 is disposed perpendicularly to the power body 21.
  • the torque sensor 50 may include a strain gauge disposed on the torque post 40.
  • the principle of the torque sensor 50 is to generate a change of resistance when the torque post 40 is curved (deformed). The change of the resistance may generate a signal, and a corresponding torque value may be obtained after calculation.
  • the torque post 40 includes a base 41 and a platform 42 connected to the base 41.
  • the torque sensor 50 is disposed on one side of the platform 42.
  • the platform 42 includes an abutting surface 421.
  • the platform 42 abuts against the outer annular rib 220 of the bushing 22 by the abutting surface 421.
  • the outer annular rib 220 is correspondingly provided with an outer annular plane 2201. That is, the abutting surface 421 of the torque post 40 abuts against on the outer annular plane 2201 of the bushing 22.
  • the torque post 40 is fixed to the bushing 22 through the outer annular rib 220.
  • the arrangement of the outer annular rib 220 may increase the structural strength of the bushing 22 to prevent the bushing 22 from being deformed under rotation and squeezing (pressure). Therefore, the torque sensor 50 disposed on the torque post 40 may receive specific deformation amount and generate a signal.
  • FIG 4 and FIG 5 are cross sectional views from two sides of the power tool in this disclosure.
  • the power device 20 of this disclosure is disposed in the main body 11.
  • the bearing set 30 is arranged between the bushing 22 and the housing 10.
  • the pair of motor fixing pieces 23 are disposed on two sides of the power body 21 opposite to each other.
  • the torque post 40 is disposed in the handle 12 and abuts against the bushing 22, and the torque sensor 50 is fixed on the platform 42 of the torque post 40.
  • the inner of the handle 12 includes a positioning space 121 and an electricity space 122 communicating with each other. Additionally, the base 41 of the torque post 40 is clamped in the positioning space 121. The platform 42 of the torque post 40 is inserted in the electricity space 122 with an installation gap 122' being defined.
  • FIG 6 is a schematic view illustrating operation of the power tool in this disclosure.
  • the power tool 1 of this disclosure further includes a gearbox 60.
  • the gearbox 60 is connected to the driving shaft 211 of the power body 21 to provide the required output torque.
  • the power tool 1 further includes a battery 70 and a control board 80.
  • the battery 70 and the control board 80 are disposed in the installation gap 122', and the control board 80 is electrically connected with the power body 21 and the torque sensor 50.
  • the power body 21 transmits the reverse force to the bushing 22, and the bushing 22 may rotate. Additionally, the rotation of the bushing 22 may drive the torque post 40 to be deformed. Accordingly, the torque sensor 50 disposed on the torque post 40 may receive the deformation amount to generate a signal.
  • the torque sensor 50 transmits the signal to the control board 80 to immediately stop the power body 21. Furthermore, when the power tool 1 is actuated, the power body 21 may be affected by the vibration of an external tool under the power transmission and influence the torque value. Furthermore, the torque sensor 50 of this disclosure is disposed on the torque post 40 perpendicularly connected to one side of the power body 21. Since the torque post 40 is not a power transmission component, it may not be affected by the vibration of the power body 21. Therefore, the torque sensor 50 may perform the torque detection to provide an accurate torque value.

Landscapes

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

Claims (9)

  1. Elektrowerkzeug, umfassend:
    ein Gehäuse (10) mit einem Hauptkörper (11) und einem Griff (12), der senkrecht mit einer Seite des Hauptkörpers (11) verbunden ist;
    eine Antriebsvorrichtung (20), die in dem Hauptkörper (11) angeordnet ist und einen Antriebskörper (21) und eine Buchse (22) umfasst, die dazu ausgelegt ist, den Antriebskörper (21) zu umgeben;
    eine Gruppe von Lagerkörpern (30), der zwischen der Buchse (22) und dem Gehäuse (10) angeordnet ist, sodass sich der Antriebskörper (21) relativ zu dem Gehäuse (10) drehen kann;
    einen Drehmomentstift (40) mit einer Basis (41), wobei der Drehmomentstift (40) in dem Griff (12) angeordnet ist und senkrecht zum Antriebskörper (21) angeordnet ist; und
    einen Drehmomentsensor (50), der auf dem Drehmomentstift (40) angeordnet ist;
    dadurch gekennzeichnet, dass der Drehmomentstift (40) ferner einen Grundkörper (42) umfasst, der mit der Basis (41) verbunden ist und im Griff (12) zwischen der Basis (41) und der Buchse (22) angeordnet ist, wobei der Drehmomentsensor (50) auf einer Seite des Grundkörpers (42) angeordnet ist.
  2. Elektrowerkzeug nach Anspruch 1, wobei eine äußere ringförmige Rippe (220) an einer Außenfläche der Buchse (22) angeordnet ist und die Gruppe von Lagerkörpern (30) ein vorderes Lager (31) und ein hinteres Lager (32) umfasst, die an zwei Seiten der äußeren ringförmigen Rippe (220) angeordnet sind.
  3. Elektrowerkzeug nach Anspruch 1 oder 2, wobei
    die Buchse (22) eine Buchsenvorderseite (221) und eine Buchsenrückseite (222) umfasst, die einander gegenüberliegen,
    eine Vielzahl von vorderen Klinken (2211) an einer Endkante der Buchsenvorderseite (221) angeordnet ist und
    eine Vielzahl von hinteren Klinken (2221) an einer Endkante der Buchsenrückseite (222) angeordnet sind.
  4. Elektrowerkzeug nach Anspruch 3, wobei die Antriebseinrichtung (20) ferner ein Paar Motorbefestigungsteile (23) umfasst, die ein vorderes Befestigungsteil (231) und ein hinteres Befestigungsteil (232) umfassen, die an zwei einander gegenüberliegenden Seiten der Buchse (22) angeordnet sind, wobei
    eine Vielzahl von vorderen Vorsprüngen (2311) zueinander beabstandet an einem Umfang des vorderen Befestigungsteils (231) angeordnet sind und
    eine Vielzahl von hinteren Vorsprüngen (2321) zueinander beabstandet an einem Umfang des hinteren Befestigungsteils (232) angeordnet sind.
  5. Elektrowerkzeug nach Anspruch 4, wobei das vordere Befestigungsteil (231) an einem Ende der Vorderseite (221) der Buchse positioniert ist, weil die vorderen Vorsprüngen (2311) in die vorderen Klinken (2211) in Eingriff stehen, und wobei das hintere Befestigungsteil (232) an einem Ende der hinteren Seite (222) der Buchse positioniert ist, weil die hinteren Vorsprüngen (2321) mit den hinteren Klinken (2221) in Eingriff stehen.
  6. Elektrowerkzeug nach Anspruch 4, wobei
    die Antriebsvorrichtung (20) ferner eine Vielzahl von Verriegelungselementen (24) umfasst,
    eine Vielzahl von ersten Verriegelungslöchern (2310) auf dem vorderen Befestigungsstück (231) definiert ist,
    eine Vielzahl von zweiten Verriegelungslöchern (210) entsprechend auf dem Antriebskörper (21) angeordnet sind und
    die vordere Befestigungsplatte (231) durch die Verriegelungselemente (24), die sich durch die ersten Verriegelungslöcher (2310) und die zweiten Verriegelungslöcher (210) erstrecken, auf dem Antriebskörper (21) befestigt ist.
  7. Elektrowerkzeug nach Anspruch 2, wobei der Grundkörper (42) eine Anlagefläche (421) aufweist und über die Anlagefläche (421) an der äußeren ringförmigen Rippe (220) der Buchse (22) anliegt.
  8. Elektrowerkzeug nach einem der vorhergehenden Ansprüche, wobei
    der Griff (12) einen Positionierungsbereich (121) und einen Elektrizitätsbereich bzw. Bereich zur Stromversorgung (122) umfasst, die miteinander in Verbindung stehen,
    die Basis (41) in dem Positionierungsbereich (121) festgeklemmt ist und
    der Grundkörper (42) in den Elektrizitätsbereich bzw. Bereich zur Stromversorgung (122) eingesetzt ist, wobei ein Einbauschlitz (122') definiert ist.
  9. Elektrowerkzeug nach Anspruch 8, weiterhin umfassend eine Batterie (70) und eine Steuerplatine (80), wobei die Batterie (70) und die Steuerplatine (80) in dem Einbauschlitz (122') angeordnet sind und die Steuerplatine (80) elektrisch mit dem Antriebskörper (21) und dem Drehmomentsensor (50) verbunden ist.
EP22201613.1A 2022-10-14 2022-10-14 Drehmomenterfassungsanordnung für ein elektrowerkzeug Active EP4353418B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP22201613.1A EP4353418B1 (de) 2022-10-14 2022-10-14 Drehmomenterfassungsanordnung für ein elektrowerkzeug

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP22201613.1A EP4353418B1 (de) 2022-10-14 2022-10-14 Drehmomenterfassungsanordnung für ein elektrowerkzeug

Publications (2)

Publication Number Publication Date
EP4353418A1 EP4353418A1 (de) 2024-04-17
EP4353418B1 true EP4353418B1 (de) 2026-03-18

Family

ID=83692669

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22201613.1A Active EP4353418B1 (de) 2022-10-14 2022-10-14 Drehmomenterfassungsanordnung für ein elektrowerkzeug

Country Status (1)

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EP (1) EP4353418B1 (de)

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB0220951D0 (en) * 2002-09-11 2002-10-23 Black & Decker Inc Safety cut-off for power tool with rotating tool bit
DE102004003202B4 (de) * 2004-01-22 2022-05-25 Robert Bosch Gmbh Handgriff mit Erfassungseinrichtung
US7552781B2 (en) * 2004-10-20 2009-06-30 Black & Decker Inc. Power tool anti-kickback system with rotational rate sensor
JP5431006B2 (ja) * 2009-04-16 2014-03-05 Ｔｏｎｅ株式会社 ワイヤレス・データ送受信システム
JP5537122B2 (ja) * 2009-11-02 2014-07-02 株式会社マキタ 電動工具
US9266178B2 (en) * 2010-01-07 2016-02-23 Black & Decker Inc. Power tool having rotary input control
JP7356312B2 (ja) * 2019-09-30 2023-10-04 株式会社マキタ 動力工具
CN217434190U (zh) * 2021-06-15 2022-09-16 瞬丰实业股份有限公司 动力工具机及其扭力显示设置

Also Published As

Publication number Publication date
EP4353418A1 (de) 2024-04-17

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