EP4021683B1 - Elektrowerkzeug zur erzeugung eines unmittelbaren drehmoments - Google Patents

Elektrowerkzeug zur erzeugung eines unmittelbaren drehmoments Download PDF

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Publication number
EP4021683B1
EP4021683B1 EP19942829.3A EP19942829A EP4021683B1 EP 4021683 B1 EP4021683 B1 EP 4021683B1 EP 19942829 A EP19942829 A EP 19942829A EP 4021683 B1 EP4021683 B1 EP 4021683B1
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EP
European Patent Office
Prior art keywords
fluid
fluid chamber
power tool
axially extending
extending body
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EP19942829.3A
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English (en)
French (fr)
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EP4021683A4 (de
EP4021683C0 (de
EP4021683A1 (de
Inventor
Li Guo Ma
Jing Feng Zhou
Rui Liang
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Techtronic Cordless GP
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Techtronic Cordless GP
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Publication of EP4021683A4 publication Critical patent/EP4021683A4/de
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Publication of EP4021683C0 publication Critical patent/EP4021683C0/de
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    • 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

  • EP 1 454 715 represents the closest prior art and discloses a power tool according to the preamble of claim 1.
  • the present invention seeks to mitigate or at least to alleviate the aforesaid problem or shortcoming by providing a power tool with a new or otherwise improved 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 rotatively driving mechanism includes an axially extending body protruding from an interior surface of the hydraulic unit. During the relative rotation between the hydraulic unit and the output shaft, the axially extending body pushes a first end wall which defining one edge of the second fluid chamber towards a second end wall which defining another edge of the second fluid chamber downwards at a first position, until the second fluid chamber is decreased to a minimum volume.
  • the hydraulic unit comprises an axially movable member.
  • a first end of the axially movable member forms the first end wall which defining said one edge of the second fluid chamber.
  • a second end of the axially movable member which is axially opposite to the first end of the axially movable member receives the push from the axially extending body.
  • the second end of the axially movable member has a wedge-shape.
  • the second end includes a slope for receiving the push from the axially extending body.
  • the rotatively driving mechanism includes a support assembly comprising a rolling member which rotates radially and synchronously with the axially extending body and a ball moveably received in the rolling member.
  • the end surface of the rolling member forms the second end wall which defining another edge of the second fluid chamber.
  • an axial movement of the ball in the second chamber expands the volume of the second fluid chamber to a maximum by rising the axially movable member after the axially movable member is released by the axially extending body at a second position.
  • the rolling member includes a groove disposed generally at an edge of the rolling member for moveably receiving the ball.
  • the groove has an arc shape with a deep middle portion and gradually shallower ends.
  • the radial rotation of the rolling member generates a relatively axial movement between the ball and the second fluid chamber.
  • the ball is adapted to move to a lowest portion of the groove when the volume of the second fluid chamber is decreased to the minimum volume.
  • the ball is further adapted to move to be received by the groove when the axially extending body begins to push a first end wall which defining one edge of the second fluid chamber towards a second end wall which defining another edge of the second fluid chamber downwards at the first position.
  • the rolling member includes a set of slots symmetrical around a center of the rolling member.
  • the set of slots coupling with a set of projections disposed on the axially extending body for receiving a driven force and generating the radial rotation of the rolling member.
  • 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 first fluid passage and the second passage is communicated through the groove.
  • the first fluid passage includes a fluid hole disposed on the output shaft.
  • the second fluid passage includes a trench for receiving the axially movable member.
  • the first fluid passage and the second fluid passage are not in fluid connection between the movements of the axially extending body from the first position to the second position.
  • the first fluid passage and the second fluid passage are in fluid connection after the axially movable member is released by the axially extending body at the second position.
  • the fluid pressure of first fluid chamber generally equals to the fluid pressure of the second fluid chamber when the axially extending body begins to push the first end wall which defining one edge of the second fluid chamber at the first position.
  • a portion of working fluid inside the second fluid chamber is squeezed out from the second fluid chamber to the trench during the push during the axially extending body and the first end wall which defining one edge of the second fluid chamber from the first position to the second position.
  • the working fluid is gas contented hydraulic fluid.
  • the hydraulic unit includes an adjusting screw located coaxially with the output shaft for adjusting the gas content of the working fluid.
  • the working fluid is arranged to flow the fluid channel and hold the first and second fluid chambers.
  • the relatively 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 first fluid chamber, the second fluid chamber and the rotatively driving mechanism are disposed inside a generally cylindrical case which is coaxial with the output shaft.
  • the first fluid chamber is surrounded by an outer side surface of the output shaft, an inner side surface of the case, and both end surfaces of the case.
  • the second fluid chamber is surrounded by an end surface of the rolling member, the first end of the axially movable member, and an outer side surface of the output shaft, and an inner side surface of the case.
  • 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.
  • the power tool 10 generally includes a housing (not shown), a transmission mechanism 12, an output shaft. 14 and a hydraulic unit 16 and an electric motor (not shown) contained within the housing.
  • the motor is configured to drive the transmission mechanism 12, and generate an instantaneous torque onto the output shaft 14 via the transmission mechanism 12 and the hydraulic unit 16.
  • the output shaft 14 is driven by the transmission mechanism 12 and hydraulic unit 16.
  • the output shaft 14 has an output for detachably connecting a tool head, such as a screwdriver head.
  • the hydraulic unit 16 is filled with a working fluid inside, and disposed coaxially with the output shaft 14.
  • 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 hydraulic unit 16 includes an axially movable member 34.
  • the axially movable member 34 is a blade 36.
  • the hydraulic unit 16 includes a pair of blades 36a and 36b which is located symmetrically with each other.
  • a lower end 38 of the blades 36 forms an end wall which defines one edge 42 of the second fluid chamber 22.
  • the upper end 40 of the blade 36 which is axially opposite to the lower end 38 of the blade 36 is adapted to receive a push and an impact from the axially extending bodies 30.
  • the said push and impact are generated by the relative rotation between the hydraulic unit 16 and the output shaft 14, in particularly by the relative rotation between the sleeve 24 and the blade 36.
  • the axially extending body 30 includes an impact surface 146, and a holding surface 148.
  • the impact surface 146 is configured to provide and initially impact and push the slope 46 of the blade 36.
  • the holding surface 148 is configured to restrict the axially movable member 34 from above for a certain distance, after the axially movable member is pushed by the impact surface 146.
  • the holder 102 includes a locating shaft 104 located on the upper portion of the holder 102.
  • the locating shaft 104 is inserted into a positioning hole 106 of the sleeve 24 to maintain the coaxiality.
  • An end face 108 is coupled with the sleeve 24 to ensure the perpendicularity of the holder 102 and the sleeve 24.
  • the holder 102 also has a locating shaft 100 for coupling with a hole 102 of the rolling member 48, a cover hole 114, and a bushing of the casing (not shown) to ensure the coaxiality of the holder 102 with the rolling member 48, the cover 26, the output shaft 14.
  • the holder 102 includes a cylindrical bore 116 which inner connects a fluid hole 118 and remains normally open with the same, which constitutes a part of the first fluid chamber 20.
  • the gas content of working fluid inside the first fluid chamber 20 and the second fluid chamber 22 can be adjusted by changing the position of an adjusting screw 120.
  • the adjusting screw 120 is further sealed by a set of seal rings 140 and 142.
  • the blade trench 72, a lower end of blade 38, the groove 56, the side surface 69 of the sleeve 24, an end surface of the rolling member 50, and the grooves 56a and 56b form two second fluid chambers 22a and 22b which located symmetrically with the output shaft 14 in radial direction.
  • the working mechanism of the second chamber 22 can be concluded as a circulation of firstly, the axially extending body 30 pushes a first end wall which defining one edge of the second fluid chamber 22 towards a second end wall which defining another edge of the second fluid chamber downwards at a first position, until the second fluid chamber 22 is decreased to a minimum volume, and an axial movement of the ball 52 in the second chamber 22 expands the volume of the second fluid chamber to a maximum by rising the axially movable member 34 after the axially movable member is released by the axially extending body 30 at a second position.
  • the hydraulic unit 16 includes a fluid hole 68 forms as the first fluid passage which punches through the surface 70, and in intermittently communication with the grooves 56a and 56b.
  • the blade trench 72 which receives the blade 36 forms the second fluid passage, which also in intermittently communication with the grooves 56.
  • the planetary gears 78 rotate about their planetary gear shaft 82, respectively, and are fixed to the sleeve 24 by a swivel bearing 84. As shown, the sun gear 76, the ring gear 80, the planetary gears 78, and the sleeve 24 are mechanically coupled. By driving with the sun gear 76, the respective rotation of each of the planetary gears 78, and the meshing with the ring gear 80, the planetary gears 78 revolve around the sun gear 76 and further drive the shaft 82 at such revolution speed.
  • the above described components collectively constitute the planetary gearing reducer 74.
  • the hydraulic unit 16 further includes a fixed gear case cover 86, and bearing mounting portions 86b, 86c.
  • the gear case cover 86 protects the rotating operation of various parts in the hydraulic unit 16 by preventing the entry of external foreign matters which cause malfunction or acceleration of mechanical loss.
  • the swivel bearing 84 includes an inner ring, an outer ring, a plurality of balls and a cage (not shown herewith).
  • the outer ring of the swivel bearing 84 is mounted on a bearing mounting portion 86c, and the inner ring of the swivel bearing is mounted on a bearing mounting portion 86d.
  • the function of the swivel bearing 84 is to ensure that the sleeve 24 rotates coaxial with the rotational center axis 90.
  • the hydraulic unit 16 further includes a cylindrical hole 92 which reserves a space for receiving the sun gear 76 to prevent the sun gear 76 from colliding with the sleeve 24 in the axial direction.
  • the top of the sleeve 24 has six cylindrical holes 94 which are distributed in a regular hexagon in circumferential direction.
  • the six cylindrical holes 94 are deformed into two groups, one of which is inserted by the planetary gear shaft 82; the other is used as rotating support holes for tightening and loosening the sleeve 24 and the cover 26 of the sleeve 24.
  • the radial width of a sleeve projection 62 is shorter than the radial width of a slot 60 of the rolling member 50, leaving a certain gap in the inner side of the slot 60.
  • the hydraulic fluid injected from an fluid fill hole 124 flows along an fluid duct 126 of the rolling member 50 and flows into the first fluid chamber 20 from the said slot 60, as the groove 94 is of an arc type with a deep middle portion, and the depth is gradually shallower at both ends.
  • a slot 99 located in the cover 26 is adapted to mount the sealing ring 128 and the C-ring 55, and the C-ring 55 is used to limit the sealing ring 128.
  • the seal ring 128 is used for static sealing and rotational dynamic sealing of the cover 26 and the holder 102.
  • the fluid holes 68a, 68b are inner connected with the first fluid chamber 20.
  • the blade trench 72a, 72b are connected with the second fluid chambers 22a and 22b.
  • the blade trench 72a and 72b which intermittently opens and closes the first fluid chamber 20 and the second fluid chamber 22a and 22b.
  • 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 .
  • FIG 13a Figure 13b and Figure 13c , it is a state when the Ceta is at 67 degrees.
  • the axially extending body 30 has already left the upper end 40 of the blade 36, thus the movement of the blade 36 is no longer restricted, the blade 36 returned to the original height.
  • the groove 56a is connected with the blade trench 72a, and the second fluid chamber 22a and 22b are connected with the first fluid chamber 20.
  • the groove 56 is also rotated to the end where the depth is shallow and the ball 52 is gradually lifted as the rolling member 50 rotates.

Claims (21)

  1. Elektrowerkzeug (10), umfassend einen Übertragungsmechanismus (12), eine Abtriebswelle (14), die durch den Übertragungsmechanismus angetrieben wird, und eine Hydraulikeinheit (16), die mit einem Arbeitsfluid gefüllt ist, wobei
    die Hydraulikeinheit mit der Abtriebswelle koaxial angeordnet ist und einen rotativen Antriebsmechanismus (18), eine erste Fluidkammer (20) und eine zweite Fluidkammer (22) definiert;
    die erste Fluidkammer über einen Fluidkanal (28) mit der zweiten Fluidkammer intermittierend in Fluidverbindung ist; und
    eine relative Rotation zwischen der Hydraulikeinheit und der Abtriebswelle bewirkt, dass der rotative Antriebsmechanismus ein Volumen der zweiten Fluidkammer, zum Erhöhen oder verringern eines Fluiddrucks, axial komprimiert oder ausdehnt, wobei eine Druckdifferenz zwischen der ersten Fluidkammer und der zweiten Fluidkammer erzeugt wird, um ein Momentanmoment an der Abtriebswelle zu bewirken, dadurch gekennzeichnet, dass:
    der rotative Antriebsmechanismus einen sich axial erstreckenden Körper (30) umfasst, der von einer Innenoberfläche (32) der Hydraulikeinheit hervorsteht; und
    während der relativen Rotation zwischen der Hydraulikeinheit und der Abtriebswelle der sich axial erstreckende Körper eine erste Stirnwand (38) eines axial bewegbaren Elements (36), die eine Kante (42) der zweiten Fluidkammer definiert, zu einer zweiten Stirnwand, die eine andere Kante (44) der zweiten Fluidkammer definiert, an eine ersten Position nach unten schiebt, bis die zweite Fluidkammer auf ein Mindestvolumen verringert ist, und
    wobei die erste Fluidkammer, die zweite Fluidkammer und der rotative Antriebsmechanismus innerhalb eines im Allgemeinen zylindrischen Gehäuses angeordnet sind, das mit der Abtriebswelle koaxial ist, wobei die erste Fluidkammer durch eine Außenseitenoberfläche (87) der Abtriebswelle, eine Innenseitenoberfläche (69) des Gehäuses und beide Stirnoberflächen des Gehäuses umgeben ist, wobei die zweite Fluidkammer durch eine Stirnoberfläche eines Rollelements (50), das erste Ende des axial bewegbaren Elements und die Außenseitenoberfläche der Abtriebswelle und die Innenseitenoberfläche des Gehäuses umgeben ist.
  2. Elektrowerkzeug nach Anspruch 1, wobei das erste Ende des axial bewegbaren Elements die erste Stirnwand bildet, die die eine Kante der zweiten Fluidkammer definiert;
    ein zweites Ende (40) des axial bewegbaren Elements, das axial entgegengesetzt zu dem ersten Ende des axial bewegbaren Elements ist, den Schub von dem sich axial erstreckenden Körper aufnimmt.
  3. Elektrowerkzeug nach Anspruch 2, wobei das zweite Ende des axial bewegbaren Elements eine Keilform aufweist und eine Schräge (46) zum Aufnehmen des Schubs von dem sich axial erstreckenden Körper umfasst.
  4. Elektrowerkzeug nach Anspruch 2, wobei
    der rotative Antriebsmechanismus eine Stützbaugruppe (48) umfasst, umfassend das Rollelement, das mit dem sich axial erstreckenden Körper radial und synchron rotiert, und eine Kugel (52), die in dem Rollelement bewegbar aufgenommen ist;
    und das Rollelement in einem Hohlraum innerhalb des axial bewegbaren Elements aufgenommen ist.
  5. Elektrowerkzeug nach Anspruch 4, wobei eine axiale Bewegung der Kugel in der zweiten Kammer das Volumen der zweiten Fluidkammer durch Erheben des axial bewegbaren Elements, nachdem das axial bewegbare Element durch den sich axial erstreckenden Körper an einer zweiten Position gelöst wird, auf ein Maximum ausdehnt.
  6. Elektrowerkzeug nach Anspruch 4, wobei
    das Rollelement eine Nut (56) umfasst, die im Allgemeinen an einer Kante des Rollelements, zum bewegbaren Aufnehmen der Kugel, angeordnet ist;
    die Nut eine Bogenform mit einem tiefen mittleren Abschnitt und allmählich flacheren Enden aufweist.
  7. Elektrowerkzeug nach Anspruch 4, wobei
    die radiale Rotation des Rollelements eine relativ axiale Bewegung zwischen der Kugel und der zweiten Fluidkammer erzeugt;
    die Kugel angepasst ist, um sich zu einem untersten Abschnitt der Nut zu bewegen, wenn das Volumen der zweiten Fluidkammer auf das Mindestvolumen verringert wird; und
    die Kugel ferner angepasst ist, um sich zu bewegen, um durch die Nut aufgenommen zu werden, wenn der sich axial erstreckende Körper beginnt, die erste Stirnwand, die eine Kante der zweiten Fluidkammer definiert, zu der zweiten Stirnwand, die eine andere Kante der zweiten Fluidkammer definiert, an die erste Position nach unten zu schieben.
  8. Elektrowerkzeug nach Anspruch 7, wobei
    das Rollelement einen Satz von Schlitzen (60) umfasst, die um eine Mitte des Rollelements symmetrisch sind; und
    der Satz von Schlitzen mit einem Satz von Vorsprüngen (62) gekoppelt ist, die auf dem sich axial erstreckenden Körper, zum Aufnehmen einer angetriebenen Kraft und zum Erzeugen der radialen Rotation des Rollelements, angeordnet sind.
  9. Elektrowerkzeug nach Anspruch 2, wobei
    der Fluidkanal (28) einen ersten Fluiddurchgang in Fluidverbindung mit der ersten Fluidkammer umfasst, ein zweiter Fluiddurchgang in Fluidverbindung mit der zweiten Fluidkammer ist und die radiale Rotation des Rollelements intermittierend mit dem ersten Fluiddurchgang und dem zweiten Fluiddurchgang fluidisch in Austausch ist.
  10. Elektrowerkzeug nach Anspruch 9, wobei der erste Fluiddurchgang und der zweite Fluiddurchgang durch die Nut in Austausch sind.
  11. Elektrowerkzeug nach Anspruch 9, wobei der erste Fluiddurchgang ein Fluidloch (68) umfasst, das an der Abtriebswelle angeordnet ist.
  12. Elektrowerkzeug nach Anspruch 9, wobei der zweite Fluiddurchgang einen Graben (72) zum Aufnehmen des axial bewegbaren Elements umfasst.
  13. Elektrowerkzeug nach Anspruch 9, wobei der erste Fluiddurchgang und der zweite Fluiddurchgang zwischen den Bewegungen des sich axial erstreckenden Körpers von der ersten Position zu der zweiten Position nicht in Fluidverbindung sind.
  14. Elektrowerkzeug nach Anspruch 9, wobei der erste Fluiddurchgang und der zweite Fluiddurchgang in Fluidverbindung stehen, nachdem das axial bewegbare Element durch den sich axial erstreckenden Körper an der zweiten Position gelöst wird.
  15. Elektrowerkzeug nach Anspruch 9, wobei der Fluiddruck der ersten Fluidkammer im Allgemeinen gleich dem Fluiddruck der zweiten Fluidkammer ist, wenn der sich axial erstreckende Körper beginnt, die erste Stirnwand, die eine Kante der zweiten Fluidkammer definiert, an die erste Position zu schieben.
  16. Elektrowerkzeug nach Anspruch 12, wobei ein Abschnitt des Arbeitsfluids innerhalb der zweiten Fluidkammer aus der zweiten Fluidkammer zu dem Graben und dem Hohlraum zum Aufnehmen des Rollelements gedrückt wird, während des Schubs, während der sich axial erstreckende Körper und die erste Stirnwand, die eine Kante der zweiten Fluidkammer definiert, von der ersten Position zu der zweiten Position.
  17. Elektrowerkzeug nach Anspruch 1, wobei das Arbeitsfluid gashaltiges Hydraulikfluid ist.
  18. Elektrowerkzeug nach Anspruch 17, wobei die Hydraulikeinheit eine Einstellschraube (120) umfasst, die sich an der Abtriebswelle, zum Einstellen des Gasgehalts des Arbeitsfluids, koaxial befindet.
  19. Elektrowerkzeug nach Anspruch 1, wobei das Arbeitsfluid arrangiert ist, um den Fluidkanal zu durchströmen und die erste und die zweite Fluidkammer zu halten.
  20. Elektrowerkzeug nach Anspruch 1, wobei der rotative Antriebsmechanismus, die erste Fluidkammer und die zweite Fluidkammer in vielzähliger Zahl koaxial und rotationssymmetrisch zueinander angeordnet sind.
  21. Elektrowerkzeug nach Anspruch 1, wobei zwei rotative Antriebsmechanismen, zwei erste Fluidkammern und zwei zweite Fluidkammern in einer um 180 ° zueinander rotationssymmetrischen Beziehung angeordnet sind.
EP19942829.3A 2019-08-27 2019-08-27 Elektrowerkzeug zur erzeugung eines unmittelbaren drehmoments Active EP4021683B1 (de)

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 (4)

Publication Number Publication Date
EP4021683A1 EP4021683A1 (de) 2022-07-06
EP4021683A4 EP4021683A4 (de) 2023-05-03
EP4021683C0 EP4021683C0 (de) 2023-12-20
EP4021683B1 true EP4021683B1 (de) 2023-12-20

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CN (1) CN216067235U (de)
WO (1) WO2021035512A1 (de)

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE504101C2 (sv) * 1994-12-30 1996-11-11 Atlas Copco Tools Ab Hydraulisk momentimpulsmekanism
US6863134B2 (en) * 2003-03-07 2005-03-08 Ingersoll-Rand Company Rotary tool
US6782956B1 (en) * 2003-03-07 2004-08-31 Ingersoll-Rand Company Drive system having an inertial valve
US7207393B2 (en) * 2004-12-02 2007-04-24 Eastway Fair Company Ltd. Stepped drive shaft for a power tool
TWI498194B (zh) * 2014-05-30 2015-09-01 Tranmax Machinery Co Ltd Impact drive
CN105201402B (zh) * 2014-06-30 2019-01-01 中国石油化工股份有限公司 扭转冲击钻井装置
CN105443034B (zh) * 2015-12-03 2017-10-27 新疆新锋锐石油技术服务股份有限公司 频率可调扭力冲击提速装置
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
KR102431500B1 (ko) * 2017-08-31 2022-08-11 우류세이사쿠 가부시키가이샤 유압식 토크 렌치의 타격 토크 발생 장치

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EP4021683A4 (de) 2023-05-03
EP4021683C0 (de) 2023-12-20
CN216067235U (zh) 2022-03-18
EP4021683A1 (de) 2022-07-06
WO2021035512A1 (en) 2021-03-04

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