EP4353418A1 - Drehmomenterfassungsanordnung für ein elektrowerkzeug - Google Patents

Drehmomenterfassungsanordnung für ein elektrowerkzeug Download PDF

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Publication number
EP4353418A1
EP4353418A1 EP22201613.1A EP22201613A EP4353418A1 EP 4353418 A1 EP4353418 A1 EP 4353418A1 EP 22201613 A EP22201613 A EP 22201613A EP 4353418 A1 EP4353418 A1 EP 4353418A1
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.)
Pending
Application number
EP22201613.1A
Other languages
English (en)
French (fr)
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/EP4353418A1/de
Publication of EP4353418A1 publication Critical patent/EP4353418A1/de
Pending legal-status Critical Current

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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 torque sensing arrangement of a power tool.
  • a power tool disposed with a torque sensor in 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 the power tool is usually installed on the transmission mechanism. Therefore, 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 to affect the electrical connection and 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.
  • One object of this disclosure is to provide a torque sensing arrangement of the power tool, which the torque post is disposed in the handle and 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 may be provided.
  • Another object of this disclosure is to provide a torque sensing arrangement of the power tool, which the torque post and the torque sensor are disposed in the handle of the housing. Therefore, the torque sensor may not rotate with the power device, and problems such as broken wires and contact failures may be avoided and the convenience of assembly is increased.
  • a power tool in the embodiment of this disclosure, includes a housing, a power device, a bearing set, a torque post and a torque sensor.
  • the housing includes a main body and a handle perpendicularly connected to one side of the main body.
  • the power device is disposed in the main body.
  • the power device includes a power body and a bushing adapted to sheathe the power body.
  • the bearing set is arranged between the bushing and the housing.
  • the power body is configured to rotate relative to the housing.
  • the torque post is disposed in the handle and abuts against the bushing.
  • the torque post is arranged perpendicularly to the power body.
  • the torque sensor is disposed on the torque post.
  • the power tool in this 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)
EP22201613.1A 2022-10-14 2022-10-14 Drehmomenterfassungsanordnung für ein elektrowerkzeug Pending EP4353418A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP22201613.1A EP4353418A1 (de) 2022-10-14 2022-10-14 Drehmomenterfassungsanordnung für ein elektrowerkzeug

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP22201613.1A EP4353418A1 (de) 2022-10-14 2022-10-14 Drehmomenterfassungsanordnung für ein elektrowerkzeug

Publications (1)

Publication Number Publication Date
EP4353418A1 true EP4353418A1 (de) 2024-04-17

Family

ID=83692669

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22201613.1A Pending EP4353418A1 (de) 2022-10-14 2022-10-14 Drehmomenterfassungsanordnung für ein elektrowerkzeug

Country Status (1)

Country Link
EP (1) EP4353418A1 (de)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1398119A1 (de) * 2002-09-11 2004-03-17 Black & Decker Inc. Sicherheitsschaltungsanordnung für drebaren Werkzeughalter
US7628219B2 (en) * 2004-01-22 2009-12-08 Robert Bosch Gmbh Handle with detecting unit
EP2248632A1 (de) * 2009-04-16 2010-11-10 Maeda Metal Industries, Ltd. Drahtloses Datenübertragungs- und -empfangssystem
EP2497607A1 (de) * 2009-11-02 2012-09-12 Makita Corporation Elektrowerkzeug
EP2631036A2 (de) * 2012-02-24 2013-08-28 Black & Decker Inc. Elektrowerkzeug mit Dreheingabesteuerung
EP2949432A1 (de) * 2006-09-12 2015-12-02 Black & Decker, Inc. Antirückschlagsystem mit drehzahlsensor für elektrowerkzeug
US20220286024A1 (en) * 2019-09-30 2022-09-08 Makita Corporation Power tool
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

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1398119A1 (de) * 2002-09-11 2004-03-17 Black & Decker Inc. Sicherheitsschaltungsanordnung für drebaren Werkzeughalter
US7628219B2 (en) * 2004-01-22 2009-12-08 Robert Bosch Gmbh Handle with detecting unit
EP2949432A1 (de) * 2006-09-12 2015-12-02 Black & Decker, Inc. Antirückschlagsystem mit drehzahlsensor für elektrowerkzeug
EP2248632A1 (de) * 2009-04-16 2010-11-10 Maeda Metal Industries, Ltd. Drahtloses Datenübertragungs- und -empfangssystem
EP2497607A1 (de) * 2009-11-02 2012-09-12 Makita Corporation Elektrowerkzeug
EP2631036A2 (de) * 2012-02-24 2013-08-28 Black & Decker Inc. Elektrowerkzeug mit Dreheingabesteuerung
US20220286024A1 (en) * 2019-09-30 2022-09-08 Makita Corporation Power tool
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

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