WO2021035512A1 - Power tool for generating an instantaneous torque - Google Patents

Power tool for generating an instantaneous torque Download PDF

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Publication number
WO2021035512A1
WO2021035512A1 PCT/CN2019/102722 CN2019102722W WO2021035512A1 WO 2021035512 A1 WO2021035512 A1 WO 2021035512A1 CN 2019102722 W CN2019102722 W CN 2019102722W WO 2021035512 A1 WO2021035512 A1 WO 2021035512A1
Authority
WO
WIPO (PCT)
Prior art keywords
fluid
fluid chamber
power tool
output shaft
axially extending
Prior art date
Application number
PCT/CN2019/102722
Other languages
English (en)
French (fr)
Inventor
Liguo Ma
Jingfeng Zhou
Rui Liang
Original Assignee
Techtronic Cordless Gp
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 Techtronic Cordless Gp filed Critical Techtronic Cordless Gp
Priority to EP19942829.3A priority Critical patent/EP4021683B1/de
Priority to PCT/CN2019/102722 priority patent/WO2021035512A1/en
Priority to CN201990001317.3U priority patent/CN216067235U/zh
Publication of WO2021035512A1 publication Critical patent/WO2021035512A1/en

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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
    • B25B21/026—Impact clutches

Definitions

  • the present invention generally relates to a power tool, and in particularly, to the power tool for generating an instantaneous or a pulsed torque via a hydraulic unit.
  • a power tool including a transmission mechanism, an output shaft driven by the transmission mechanism, and a hydraulic unit filled with a working fluid.
  • the hydraulic unit is disposed coaxially with the output shaft, and defines a rotatively driving mechanism, a first fluid chamber, and a second fluid chamber.
  • the first fluid chamber is in intermittently fluid connection with the second fluid chamber via a fluid channel.
  • a relative rotation between the hydraulic unit and the output shaft causes the rotatively driving mechanism to axially compress or expand a volume of the second fluid chamber for raising or decreasing a fluid pressure of the second fluid chamber, generating a pressure difference between the first fluid chamber and the second fluid chamber to cause an instantaneous torque to the output shaft.
  • the fluid channel includes a first fluid passage is in fluid connection with the first fluid chamber, a second fluid passage is in fluid connection with the second fluid chamber.
  • the radial rotation of the rolling member intermittently fluidly communicates the first fluid passage and the second fluid passage.
  • the second fluid passage includes a trench for receiving the axially movable member.
  • the rotatively driving mechanism, the first fluid chamber, and the second fluid chamber are disposed in plural numbers coaxially and rotationally symmetrical to each other.
  • the two rotatively driving mechanisms, two first fluid chambers, and two second fluid chambers are disposed in a relationship rotationally symmetrical by 180° to each other.
  • the present invention therefore provides a new or otherwise improved structure of the hydraulic unit which reduce the noises and the reaction force and vibration inside the hydraulic, thus provides a better user experience to the user, and a longer service life of the power tool.
  • Figure 5b shows a rear view of the hydraulic unit and output shaft of Figure 1.
  • Figure 6b shows rear view of the rolling member of Figure 6a.
  • Figure 7a shows an internal view of a cover which forms a part of the hydraulic unit of Figure 1.
  • Figure 7b shows an external view of the cover of Figure 7a.
  • Figure 10c shows a force analysis diagram of the axially moveable member under ideal conditions during the impacting between the axially extending body and the axially moveable member as shown from Figure 10a to Figure 11a.
  • Figure 14c shows a schematic diagram of the projection of the ball, the fluid hole and the blade trench on the rolling member in accordance with the positional relationship as shown in Figure 14a.
  • the hydraulic unit 16 defines a rotatively driving mechanism 18, a first fluid chamber 20, and a second fluid chamber 22.
  • the first fluid chamber 20 is in intermittently fluid connection with the second fluid chamber via a fluid channel 28, and due to a relative rotation between the hydraulic unit 16 and the output shaft 14.
  • the said relative rotation causes the rotatively driving mechanism 18 to axially compress or expand a volume of the second fluid chamber 22. Therefore, a fluid pressure of the second fluid chamber 22 is either increased or decreasing in accordance with the compressing or expanding the volume of the second fluid chamber 22.
  • the said change of the fluid pressure of the second chamber 22 results in an instantaneous torque to the output shaft 14.
  • the rotatively driving mechanism 18 includes a holder 102 and a support assembly 48.
  • the holder 102 is adapted to hold the support assembly 48, a ball 52, the blade 36, and other related components which are shown in Figure 5 and 6.
  • the support assembly 48 is located under the blade 36 and further dynamically supports the axially movement of the blade 36.
  • the support assembly 48 includes a rolling member 50 and a ball 52.
  • the rolling member 50 which has a roughly disc shape rotates radially and synchronously with the axially extending bodies 30a and 30b.
  • the ball 52 is moveably received in the rolling member 50.
  • an upper end surface 54 of the rolling member 50 forms an end wall which defines another edge 44 of the second fluid chamber 22.
  • the rolling member 50 includes a set of slots 60a and 60b which are located symmetrically around a center of the rolling member 50.
  • the set of slots 60a and 60b are configured to couple with a set of projections 62a and 62b disposed on the sleeve 24 for receiving a driven force and generating the radial rotation of the rolling member 50, which is synchronous with the sleeve 24.
  • a bearing 88 includes an inner ring, an outer ring, a plurality of balls and a cage are (not shown herewith) .
  • the outer ring of the bearing 88 is mounted on the bearing mounting portion 86b, and the inner ring is mounted on the bearing mounting portion 86a.
  • the function of the bearing 88 is to ensure that the sun gear 76 rotates coaxial with a rotational center axis 90.
  • Figure 8a is a cross-sectional view along line A of Figure 3.
  • FIG. 10c is a force analysis diagram under ideal conditions during in the impacting.
  • the sleeve 24 continues to rotate, generating a thrust F1 towards the blade 36.
  • the blade 36 is forced to move downwards along the blade trench 72, and the ball 52 is also moved downwards by the blade ball groove 86.
  • the second fluid chamber 22 and the first fluid chamber 20 are not in connection, and the hydraulic fluid in the second fluid chamber 6 is discharged along the blade trench 72.
  • the Ceta angle is 45 degrees. It can be seen that the state at this time is similar to the state of Ceta is 5 degrees, and e lower end 38 of the blade 36 is supported and restricted by the support assembly 48, at which time the axially movement of the blade 36 is also restricted by the axially extending body 30 from above.
  • the groove 56 is not connected with the fluid hole 68, and the first fluid chamber 20 and the second fluid chamber 6 are not connected herewith, which is consistent with the Figure 8c.
  • Figure 14a Figure 14b and Figure 14c, it is a state when the Ceta is at 90 degrees. As can be seen from Figures 14a, b, at this point the ball 50is already located at the top 88 of the blade trench 72. Meanwhile, the blade 36 has reached the highest axial position.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
  • Fluid-Damping Devices (AREA)
PCT/CN2019/102722 2019-08-27 2019-08-27 Power tool for generating an instantaneous torque WO2021035512A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP19942829.3A EP4021683B1 (de) 2019-08-27 2019-08-27 Elektrowerkzeug zur erzeugung eines unmittelbaren drehmoments
PCT/CN2019/102722 WO2021035512A1 (en) 2019-08-27 2019-08-27 Power tool for generating an instantaneous torque
CN201990001317.3U CN216067235U (zh) 2019-08-27 2019-08-27 用于产生瞬时转矩的动力工具

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2019/102722 WO2021035512A1 (en) 2019-08-27 2019-08-27 Power tool for generating an instantaneous torque

Publications (1)

Publication Number Publication Date
WO2021035512A1 true WO2021035512A1 (en) 2021-03-04

Family

ID=74684936

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2019/102722 WO2021035512A1 (en) 2019-08-27 2019-08-27 Power tool for generating an instantaneous torque

Country Status (3)

Country Link
EP (1) EP4021683B1 (de)
CN (1) CN216067235U (de)
WO (1) WO2021035512A1 (de)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5704434A (en) * 1994-12-30 1998-01-06 Atlas Copco Tools Ab Hydraulic torque impulse mechanism
CN1782445A (zh) * 2004-12-02 2006-06-07 创科实业有限公司 阶梯轴
TW201544264A (zh) * 2014-05-30 2015-12-01 Tranmax Machinery Co Ltd 衝擊式傳動裝置
CN105201402A (zh) * 2014-06-30 2015-12-30 中国石油化工股份有限公司 扭转冲击钻井装置
CN105443034A (zh) * 2015-12-03 2016-03-30 克拉玛依市新锋锐金刚石钻头制造有限公司 频率可调扭力冲击提速装置
CN109421012A (zh) * 2017-08-31 2019-03-05 瓜生制作株式会社 液压式扭矩扳手的冲击扭矩产生装置

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6782956B1 (en) * 2003-03-07 2004-08-31 Ingersoll-Rand Company Drive system having an inertial valve
US6863134B2 (en) * 2003-03-07 2005-03-08 Ingersoll-Rand Company Rotary tool
WO2018054311A1 (zh) * 2016-09-20 2018-03-29 苏州宝时得电动工具有限公司 电动工具

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5704434A (en) * 1994-12-30 1998-01-06 Atlas Copco Tools Ab Hydraulic torque impulse mechanism
CN1782445A (zh) * 2004-12-02 2006-06-07 创科实业有限公司 阶梯轴
TW201544264A (zh) * 2014-05-30 2015-12-01 Tranmax Machinery Co Ltd 衝擊式傳動裝置
CN105201402A (zh) * 2014-06-30 2015-12-30 中国石油化工股份有限公司 扭转冲击钻井装置
CN105443034A (zh) * 2015-12-03 2016-03-30 克拉玛依市新锋锐金刚石钻头制造有限公司 频率可调扭力冲击提速装置
CN109421012A (zh) * 2017-08-31 2019-03-05 瓜生制作株式会社 液压式扭矩扳手的冲击扭矩产生装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP4021683A4 *

Also Published As

Publication number Publication date
EP4021683C0 (de) 2023-12-20
CN216067235U (zh) 2022-03-18
EP4021683A1 (de) 2022-07-06
EP4021683A4 (de) 2023-05-03
EP4021683B1 (de) 2023-12-20

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