EP4116035A1 - Kraftmaschinenwerkzeug - Google Patents

Kraftmaschinenwerkzeug Download PDF

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Publication number
EP4116035A1
EP4116035A1 EP21184026.9A EP21184026A EP4116035A1 EP 4116035 A1 EP4116035 A1 EP 4116035A1 EP 21184026 A EP21184026 A EP 21184026A EP 4116035 A1 EP4116035 A1 EP 4116035A1
Authority
EP
European Patent Office
Prior art keywords
power
torque
machine tool
housing
disposed
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.)
Granted
Application number
EP21184026.9A
Other languages
English (en)
French (fr)
Other versions
EP4116035B1 (de
EP4116035C0 (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 EP21184026.9A priority Critical patent/EP4116035B1/de
Publication of EP4116035A1 publication Critical patent/EP4116035A1/de
Application granted granted Critical
Publication of EP4116035B1 publication Critical patent/EP4116035B1/de
Publication of EP4116035C0 publication Critical patent/EP4116035C0/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • 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
    • 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

Definitions

  • the technical field of the present disclosure relates to a power tool, and in particular, to a power machine tool and a torque display structure thereof.
  • a related-art power tool such as electric screwdriver and impact wrench, etc.
  • its structure mainly includes a housing, a power device (such as battery or pressurized air), a transmission mechanism and a control element, etc.
  • the power device is secured inside the housing and the rotating axle is connected to the transmission mechanism, and the control element is electrically connected to the power device. Accordingly, the control element is used to control the running of the power device to drive the transmission mechanism and the tool head installed on the transmission mechanism, thereby providing sufficient torque to allow the tool head to rotate.
  • the related-art power tools are torque adjustable devices, and such power tools often continue to rotate after exceeding the predefined torques, leading to the situations of damaged components and reduced useful life of the power tools. Accordingly, there is a need for improvement of such situations.
  • the related-art power tools are installed with torque sensors to detect the torques.
  • a signal is transmitted to the control element to control the power device to stop running.
  • the torque sensors of related-art power tools are arranged on the transmission mechanism, and such torque sensors are constantly under the rotational state as they rotate with the running of the transmission mechanism. Consequently, the drawbacks of rupture of cables or improper electrical contact often occur and the electrical connection is affected, leading to damages of the power tool.
  • the transmission mechanism connecting to the tool head is also subject to vibration and deformation, such that the torque value detected by the torque sensor arranged on the power tool is affected, thereby reducing the accuracy of the torque sensor.
  • the inventor seeks to overcome the aforementioned drawbacks associated with the current technology and aims to provide an effective solution through extensive researches along with utilization of academic principles and knowledge.
  • An objective of the present disclosure is to provide a power machine tool, and the power body is able to rotate relative to the housing via the arrangement of the bearing set, such that the power body is under the reverse rotation state when the predefined torque is exceeded.
  • the torque sensor is able to transmit signal to the control board to stop the running of the power body, thereby preventing the situations of damages of the power device or reduction of useful life.
  • a housing includes an accommodating space and a working end located on a front end of the accommodating space.
  • the working end includes an opening.
  • a control board is disposed in the accommodating space.
  • a power device is disposed in the accommodating space, and the power device includes a power body electrically connected to the control board, a driving axle driven by the power body, and a protective cover configured to cover the power body.
  • a bearing set is arranged between the protective cover and the housing to make the power body rotate relative to the housing.
  • a transmission mechanism is disposed in the accommodating space and located on a front side of the power device. The transmission mechanism includes an actuating portion.
  • the actuating portion rotates with the driving axle and is extended out of the opening of the housing to drive a tool piece to rotate.
  • a torque axle is disposed in the accommodating space and located on a rear side of the power device opposite to the transmission mechanism. The torque axle is connected to the power device and configured to rotate with the power device.
  • An objective of the present disclosure is to provide a torque display structure for a power machine tool.
  • the torque sensor is arranged on a rear side of the power device, such that the torque detection is not affected by the vibration of the external tool piece, thereby providing an accurate torque value.
  • the present disclosure provides a torque display structure for a power machine tool, including a power machine tool and a torque sensor.
  • the torque sensor is arranged in the housing and located on a rear side of the power device.
  • a power machine tool of the present disclosure includes a bearing set arranged between the power body and the housing such that once the predefined torque is exceeded, the power body is able to perform rotation relative to the housing and to be in a reverse rotation state.
  • the torque sensor is able to transmit signal to the control board to stop the running of the power body, thereby preventing damages of the power device or reduction of useful life.
  • the present disclosure further provides a torque display structure for a power machine tool, and the torque sensor is arranged on a rear side of the power device, such that the torque detection is not affected by the vibration of the external tool piece or any deformation, thereby providing an accurate torque value.
  • the arrangement of the torque sensor on the rear end of the housing of the power machine tool is able to further reduce the space on the front end of the housing and to prevent impacts on the power output. Accordingly, the power output may be transmitted to the working end more directly, thereby enhancing the practical use and application.
  • the power machine tool 1 of the present disclosure includes a housing 10 and a control board 20, a power device 30, a bearing set 40, a transmission mechanism 50 and a torque axle 60 disposed in the housing 10.
  • the power device 30 is disposed in the housing 10 via the bearing set 40 and transmits a torque to a tool piece (not shown in the drawings) via the transmission of the transmission mechanism 50.
  • the torque axle 60 is connected to the rear side of the power device 30 and rotates with the power device 30 to constitute the power machine tool 1.
  • the structure of the power machine tool 1 please refer to the following description.
  • the housing 10 includes an accommodating space 100 and a working end 101 located on a front end of the receiving space 100.
  • the working end 101 includes an opening 102 connected to the external.
  • the control board 20 is electrically connected to the power device 30 to control the operation of the power machine tool 1.
  • the power device 30 is disposed in the accommodating space 100.
  • the power device 30 includes a power body 31 electrically connected to the control board 20, a driving axle 32 driven by the power body 31, a protective cover 33 covering the power body 31, and a driving gear 321 attached to the driving axle 32.
  • the driving gear 321 is connected to the transmission mechanism 50.
  • the power body 31 is an electric motor and uses a battery as the power source.
  • the electric motor is used to drive the driving axle 32 to rotate.
  • the power body 31 may also be an air motor using a compressed air as the power source such that a high-pressure air may be used to drive the driving axle 32 to rotate.
  • the bearing set 40 is arranged between the protective cover 33 and the housing 10 to make the power body 31 (together with the protective cover 33) rotate relative to the housing 10.
  • the transmission mechanism 50 is disposed in the accommodating space 100 and is located on a front side of the power device 30.
  • the transmission mechanism 50 includes an actuating portion 52.
  • the actuating portion 52 rotates with the driving axle 32 and is extended out of the opening 102 of the housing to drive the tool piece (not shown in the drawings) to rotate.
  • the torque axle 60 is disposed in the accommodating space 100 and is located on a rear side of the power device 30 opposite to the transmission mechanism 50.
  • the torque axle 60 is connected to the power device 30 and is configured to rotate with the power device 30.
  • the power body 31 is an electric motor.
  • the transmission mechanism 50 includes a gearbox 51 connected to the driving axle 32.
  • the actuating portion 52 is connected to the gearbox 51 to perform rotational output.
  • the housing 10 includes a body portion 11 and a handle portion 12 connected to the body portion 11.
  • the power device 30 and the transmission mechanism 50 are arranged on the body portion 11.
  • the handle portion 12 includes a button 121 arranged to be exposed from the housing.
  • the power machine tool 1 further includes a battery 80.
  • the battery 80 is arranged on the handle portion 12 and is electrically connected to the control board 20 to provide a power necessary for the operation of the power machine tool 1.
  • the torque axle 60 may also be arranged on the rear side edge of the power device 30, such as on the rear end of the power body 21 and adjacent to one side edge of the battery 80 or the button 121.
  • the present disclosure further provides a torque display structure (arrangement) for a power machine tool, including the power machine tool 1 and a torque sensor 2.
  • the torque sensor 2 may be a strain gauge disposed in the accommodating space 100 and located on the rear side of the power device 30.
  • the torque sensor 2 is arranged on the torque axle 60 and provided to detect a torque of the power machine tool 1.
  • the torque sensor 2 may also be arranged on a sleeve 342 or a rear receiving seat 70 as described in the following.
  • the power machine tool 1 of the present disclosure further includes a display unit 3.
  • the display unit 3 is exposed from the housing 10 and is electrically connected to the control board 20, and is used to display a torque value of the power machine tool 1.
  • the power device 30 further includes a linkage cover 34 arranged between the protective cover 33 and the torque axle 60.
  • a linkage cover 34 arranged between the protective cover 33 and the torque axle 60.
  • two sides of the linkage cover 34 are connected to the protective cover 33 and the torque axle 60 respectively.
  • the protective cover 33 includes a front side 331 and a rear side 332 opposite from each other.
  • the front side 331 includes a plurality of first ratchets 3311 formed thereon
  • the rear side 332 includes a plurality of second ratchets 3321 formed thereon.
  • the linkage cover 34 includes a plurality of third ratchets 340 formed on one side thereof facing the protective cover 33 and engaged with the second ratchets 3321.
  • the linkage cover 34 includes a cover shield 341 and a sleeve 342 connected to the cover shield 341.
  • the cover shield 341 covers a rear side of the power body 31 and includes the plurality of third ratchets 340 formed thereon.
  • the sleeve 342 covers a front end of the torque axle 60.
  • the sleeve 342 is formed of a hexagonal hole 3420 thereon (as shown in FIG 4 ), and the front end of the torque axle 60 includes a hexagonal column 62 formed thereon.
  • the torque axle 60 penetrates the hexagonal hole 3420 through the hexagonal column 61 to be attached in the sleeve 342.
  • the power machine tool 1 further includes a rear receiving seat 70.
  • the rear receiving seat 70 is secured in the housing 1 (as shown in FIG 1 ) and is configured to receive a rear end of the torque axle 60.
  • an outer circumferential surface of the torque axle 60 includes two protruding rings 62 formed spaced apart from each other. The two protruding rings 62 abut against the sleeve 342 and the rear receiving seat 70 respectively. Accordingly, the torque axle 60 is supported between the linkage cover 34 and the rear receiving seat 70.
  • the transmission mechanism 50 further includes a connecting ring 53.
  • the connecting ring 53 includes a plurality of protrusions 531 formed spaced apart from each other, and the plurality of protrusions 531 are fastened on the first ratchets 3311.
  • the bearing set 40 disposed between the protective cover 33 and the housing 10 includes a front bearing 41 and a rear bearing 42 arranged spaced apart from each other.
  • An outer circumferential surface of the protective cover 33 includes a first circumferential rib 333 formed thereon.
  • the front bearing 41 and the rear bearing 42 respectively abut against two sides of the first circumferential rib 333 and are formed with a circumferential slot 330 (as shown in FIG 2 ).
  • an inner wall of the housing 10 includes a second circumferential rib 13 formed thereon (as shown in FIG 1 ).
  • the protective cover 33 abuts against the first circumferential rib 333 via the second circumferential rib 13 to be positioned inside the housing 10.
  • the user is able to press the button 121 to trigger the control board 20 to start the operation.
  • the control board 20 drives the power body 31 to start running.
  • the power body 31 drives the transmission mechanism 50 to rotate via the driving axle 32.
  • the actuating portion 52 of the transmission 50 then drives the external tool piece to rotate.
  • the power body 31 is able to utilize the bearing set 40 to perform rotation relative to the housing 10.
  • the linkage cover 34 and the torque axle 60 are able to rotate together with the power body 31.
  • the torque sensor 2 arranged on the rear side of the power body 31 is able to detect the torque, and such torque signal is transmitted by the control board 20 and displayed on the display unit 3.
  • the power body 31 of the present disclosure exceeds the predefined torque, the power body 31 is under a reverse rotation state, and the torque is transmitted to the torque axle 60.
  • the torque sensor 2 is able to transmit signal to the control board to immediately stop the running of the power body 31.
  • the torque sensor 2 of the present disclosure is arranged on the rear side of the power device 31, such that the torque detection is not affected by the vibration of the external tool piece, and it is able to provide an accurate torque value.
  • the arrangement of the torque sensor 2 on the rear end of the housing 10 of the power machine tool 1 is able to further reduce the space at the front end of the housing 10 and to prevent impacts on the power output. Accordingly, the power output may be transmitted to the working end 101 more directly.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Portable Power Tools In General (AREA)
EP21184026.9A 2021-07-06 2021-07-06 Kraftmaschinenwerkzeug Active EP4116035B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP21184026.9A EP4116035B1 (de) 2021-07-06 2021-07-06 Kraftmaschinenwerkzeug

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP21184026.9A EP4116035B1 (de) 2021-07-06 2021-07-06 Kraftmaschinenwerkzeug

Publications (3)

Publication Number Publication Date
EP4116035A1 true EP4116035A1 (de) 2023-01-11
EP4116035B1 EP4116035B1 (de) 2023-12-13
EP4116035C0 EP4116035C0 (de) 2023-12-13

Family

ID=76829343

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21184026.9A Active EP4116035B1 (de) 2021-07-06 2021-07-06 Kraftmaschinenwerkzeug

Country Status (1)

Country Link
EP (1) EP4116035B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4349529A1 (de) * 2022-10-06 2024-04-10 Matatakitoyo Tool Co., Ltd. Drehmomenterfassungsvorrichtung für ein elektrowerkzeug

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090064824A1 (en) * 2006-02-20 2009-03-12 Honda Motor Co., Ltd. Bolt-tightening tool
US9475180B2 (en) * 2010-01-07 2016-10-25 Black & Decker Inc. Power tool having rotary input control
US20170216999A1 (en) * 2016-01-29 2017-08-03 Ming-Ta Cheng Power tool with a double operational structure

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090064824A1 (en) * 2006-02-20 2009-03-12 Honda Motor Co., Ltd. Bolt-tightening tool
US9475180B2 (en) * 2010-01-07 2016-10-25 Black & Decker Inc. Power tool having rotary input control
US20170216999A1 (en) * 2016-01-29 2017-08-03 Ming-Ta Cheng Power tool with a double operational structure

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4349529A1 (de) * 2022-10-06 2024-04-10 Matatakitoyo Tool Co., Ltd. Drehmomenterfassungsvorrichtung für ein elektrowerkzeug

Also Published As

Publication number Publication date
EP4116035B1 (de) 2023-12-13
EP4116035C0 (de) 2023-12-13

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