US20180290284A1 - Electric power tool - Google Patents

Electric power tool Download PDF

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Publication number
US20180290284A1
US20180290284A1 US15/578,016 US201615578016A US2018290284A1 US 20180290284 A1 US20180290284 A1 US 20180290284A1 US 201615578016 A US201615578016 A US 201615578016A US 2018290284 A1 US2018290284 A1 US 2018290284A1
Authority
US
United States
Prior art keywords
gear
motor
shaft portion
coupling
input gear
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.)
Abandoned
Application number
US15/578,016
Other languages
English (en)
Inventor
Karl Göran Johansson
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.)
Atlas Copco Industrial Technique AB
Original Assignee
Atlas Copco Industrial Technique AB
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 Atlas Copco Industrial Technique AB filed Critical Atlas Copco Industrial Technique AB
Assigned to ATLAS COPCO INDUSTRIAL TECHNIQUE AB reassignment ATLAS COPCO INDUSTRIAL TECHNIQUE AB ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: JOHANSSON, Karl Göran
Publication of US20180290284A1 publication Critical patent/US20180290284A1/en
Abandoned legal-status Critical Current

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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
    • 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
    • B25F5/001—Gearings, speed selectors, clutches or the like specially adapted for rotary tools
    • 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
    • B25B23/0007—Connections or joints between tool parts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
    • F16D3/16—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts
    • F16D3/18—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts the coupling parts (1) having slidably-interengaging teeth
    • F16D3/185—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts the coupling parts (1) having slidably-interengaging teeth radial teeth connecting concentric inner and outer coupling parts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
    • F16D3/50—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive with the coupling parts connected by one or more intermediate members
    • F16D3/72—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive with the coupling parts connected by one or more intermediate members with axially-spaced attachments to the coupling parts
    • 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

Definitions

  • the invention relates to an electric power tool with an electric motor that is connected to an output shaft via a power transmission.
  • Electric torque delivering power tools such as screw drivers, are used in a wide variety of applications. Different applications set different demands with respect to performance parameters such as speed and torque level. Therefore, there is a desire to produce electric power tools in a modular shape such that components such as the motor and reduction gearings may be exchanged for different ones within the existing tool housing, without the necessity of time consuming and costly adaptations.
  • Modular power tools typically include a casing that is adapted to receiving different motors and/or different gearings depending on specific needs or applications.
  • a problem related to such power tools is however that the power transmission is normally not so easily adapted to the different modules.
  • the power transmission is produced as rigid as possible so as to transmit the torque in a best manner with as little losses as possible. This may result in a power transmission with poor tolerances for axial un-alignment, whereby harmful stress may be created along the power transmission or in the motor or output shaft. Further such power transmission is not configured to be replaced or adapted for different applications,
  • An object of the invention is to provide an electric power tool that makes it possible to replace parts of the power tool as modules while at the same time providing an efficient and liable power transmission.
  • an electric power tool comprising an electric motor connected to a motor gear; an output shaft connected to an input gear; a coupling that connects the motor gear to the input gear; and a housing that houses the motor, motor gear, coupling and input gear.
  • the coupling includes a shaft portion and two connective portions arranged at opposite ends of the shaft portion for connection to the motor gear and input gear, respectively, wherein at least one of the motor gear and the input gear has a cambered profile allowing a tilting movement of the coupling with respect to the axial position of the one of the motor gear and the input gear that has a cambered profile.
  • This arrangement has an improved tolerance to axial un-alignment of components involved in the power transmission with respect to conventional arrangements.
  • the coupling may be easily adapted to different modules of different length by simply replacing the shaft portion of the coupling with a shaft portion of a different length.
  • FIG. 1 shows a power tool according to a specific embodiment of the invention
  • FIG. 2 is a sectional view of the power transmission of the power tool in FIG. 1 ;
  • FIG. 3 is a perspective cut view of a coupling in accordance with the invention.
  • FIG. 4 is an exploded view of a coupling in accordance with the invention.
  • FIG. 1 a power tool according to a specific embodiment of the invention is shown.
  • the shown power tool 10 is an electric torque delivering power tool that includes a motor 11 , which is connected via a power transmission including a reduction gear 12 to an output shaft 13 .
  • a bit holder 14 is arranged on the outer end of the output shaft 13 for insertion of a screw or nut connectable bit.
  • the power transmission further includes a motor gear 15 that is driven by the motor 11 and connected via a coupling 17 to an input gear 16 of the reduction gear 12 .
  • a housing 18 is arranged to house the motor 11 and the power transmission.
  • the output shaft 13 extends through a front end of the housing 18 .
  • a torsion spring 19 is arranged to take up reaction forces between the reduction gear 12 and the housing 18 .
  • the shown torsion spring 19 is a helical spring that is tightly fitted inside a tubular portion of the housing 18 .
  • FIG. 2 a sectional view of the power transmission of the power tool 10 is shown.
  • the reduction gear 12 is a planetary gear driven by a sun gear 22 that is connected to the input gear 16 via a planet gear connection 33 .
  • An output gear 23 of the planetary gear is connected to the planet carrier (not shown) of the planetary gear.
  • a gear rim (not shown) is arranged outside the planet carrier.
  • the gear rim is arranged in a single bearing 24 with respect to the housing.
  • the gear rim is not fixed to the housing, but is arranged to rotate against the action of the torsion spring 19 .
  • This is just an exemplary embodiment and the planetary gear may just as well be fully supported by the housing 18 and the torsion spring may be dispensed with.
  • the inventive coupling 17 that connects the motor gear 15 to the input gear 16 is shown inside of the torsion spring 19 the inventive coupling 17 that connects the motor gear 15 to the input gear 16 is shown.
  • the coupling 17 is shown in detail in FIGS. 3 and 4 . It includes a shaft portion 25 and two connective portions 26 arranged at opposite ends of the shaft portion 25 for connection to the motor gear 15 and input gear 16 , respectively.
  • the motor gear 15 is connected to a motor shaft 28 that is driven by the motor and the input gear is connected to a reduction gear via a reduction gear connection 33 .
  • the motor gear 15 and the input gear 16 of the specific embodiment have cambered profiles allowing a tilting movement with respect to the axial position of the coupling 17 .
  • the cambered profile means that the toothed part of the gear has a radius that varies axially. The radius is as largest near the middle of the toothed gear and decreases in both directions from the maximum radius near the middle.
  • the toothed gears 15 and 16 are to be arranged in meshing contact with the connective portions 26 , which hence include a toothed or splined interior 32 .
  • the splined interior 32 includes straight splines with a same inner profile throughout its splined length. To achieve the best meshing interaction the curvature of the cambered teeth should have a part circular circumference that provides an equally good mesh with the splined interior 32 of the connective portions 26 irrespective of whether the connection is slightly tilted or perfectly straight.
  • both the motor gear 15 and the input gear 16 have a cambered gear profile.
  • An effect is however achieved as soon as only one of the motor gear 15 and the input gear 16 has a cambered gear profile, allowing a tilting movement of the coupling 17 with respect to the axial position of the one of the motor gear 15 and the input gear 16 that has a cambered profile.
  • Both the connective portions 26 include splines for meshing connection to the motor gear 15 and input gear 16 , respectively.
  • the splined connective portions 26 of the coupling are plastic parts that are fitted inside the shaft portion 25 .
  • the connective portions 26 are produced with a tight tolerance so as to be press fitted inside the end openings of the shaft portion 25 .
  • An advantage of a press fitted arrangement is that no adhesive is needed.
  • the shaft portion 25 may be tube shaped, but it may also, as in the shown embodiment comprise a solid midsection 27 .
  • the solid midsection 27 may function as an axial stop and support for the connective portions 26 .
  • each connective portion 26 may be provided with a rim 29 that also functions as an axial stop and support for the connective portions 26 , such that the solid midsection 27 is not needed for that purpose.
  • the rims 29 comprise recesses 30 , in which guides 31 of the shaft portion 25 fit so as to lock the connective portions 26 and the shaft portion 25 from mutual rotation.
  • the guides 31 may also include grip ends (not shown) for locking the connective portions 26 axially to the shaft portion 25 . Typically though, such grip ends are not needed since the tight fit between the shaft portion 25 and the connective portions 26 is tight enough to guarantee that they will remain locked to each other.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Retarders (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Gear Transmission (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
US15/578,016 2015-06-30 2016-06-13 Electric power tool Abandoned US20180290284A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE1550912A SE538749C2 (sv) 2015-06-30 2015-06-30 Electric power tool
SE1550912-8 2015-06-30
PCT/EP2016/063474 WO2017001176A1 (en) 2015-06-30 2016-06-13 Electric power tool

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2016/063474 A-371-Of-International WO2017001176A1 (en) 2015-06-30 2016-06-13 Electric power tool

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US17/589,183 Continuation US11701768B2 (en) 2015-06-30 2022-01-31 Electric power tool

Publications (1)

Publication Number Publication Date
US20180290284A1 true US20180290284A1 (en) 2018-10-11

Family

ID=56137303

Family Applications (2)

Application Number Title Priority Date Filing Date
US15/578,016 Abandoned US20180290284A1 (en) 2015-06-30 2016-06-13 Electric power tool
US17/589,183 Active US11701768B2 (en) 2015-06-30 2022-01-31 Electric power tool

Family Applications After (1)

Application Number Title Priority Date Filing Date
US17/589,183 Active US11701768B2 (en) 2015-06-30 2022-01-31 Electric power tool

Country Status (7)

Country Link
US (2) US20180290284A1 (zh)
EP (1) EP3317050B1 (zh)
JP (1) JP6829713B2 (zh)
KR (1) KR102509250B1 (zh)
CN (1) CN107848100B (zh)
SE (1) SE538749C2 (zh)
WO (1) WO2017001176A1 (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220152807A1 (en) * 2015-06-30 2022-05-19 Atlas Copco Industrial Technique Ab Electric power tool

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US9441678B2 (en) * 2014-02-13 2016-09-13 Matt Nelson Shearable drive coupling assembly
US9642494B1 (en) * 2013-10-21 2017-05-09 Kevin Brun Radial immersion blender
US9976332B2 (en) * 2014-06-27 2018-05-22 Magna Closures Inc. Electromechanical strut with integrated flex coupling and slip device and clutch/coupling assembly therefor

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Publication number Priority date Publication date Assignee Title
US61581A (en) * 1867-01-29 -taylor
US2346058A (en) * 1941-10-22 1944-04-04 Spicer Mfg Corp Constant-velocity joint
US2430683A (en) * 1945-10-30 1947-11-11 Morgan Construction Co Wabbler coupling
US2857749A (en) * 1956-08-14 1958-10-28 Nylo Flex Products Company Flexible coupling
US3174302A (en) * 1962-07-27 1965-03-23 Midland Ross Corp Gear coupling
US3313124A (en) * 1964-11-27 1967-04-11 Midland Ross Corp Flexible coupling
US3734205A (en) * 1971-06-04 1973-05-22 S Maurer Rotary power tool with centrifugal coupling means
US3874194A (en) * 1974-04-12 1975-04-01 Midland Ross Corp Gear type torsion coupling with quickly replaceable sleeve
US4033144A (en) * 1976-02-18 1977-07-05 Allen Clifford H Flexible coupling
US4373925A (en) * 1977-09-21 1983-02-15 Fickelscher Kurt G Elastic coupling
US4318627A (en) * 1979-05-15 1982-03-09 Societe Anonyme D.B.A. Ball and socket articulated joint
US4357137A (en) * 1980-08-18 1982-11-02 Arinc Research Corporation Shaft coupling
US4416645A (en) * 1982-01-13 1983-11-22 Rexnord Inc. Piloted flexible coupling
US4530674A (en) * 1983-09-30 1985-07-23 Allied Corporation Coupling arrangement for driving and driven members
US4913681A (en) * 1987-05-18 1990-04-03 Green Paul C Shock absorbing rotary gear coupling
US4950101A (en) * 1989-03-10 1990-08-21 M-B-W Inc. Shaft coupling construction for a vibratory screed
US5139460A (en) * 1989-11-16 1992-08-18 Hoyt Iii Raymond E Flexible couplings with end float limiting
US5197786B1 (en) * 1991-10-04 1995-06-20 Nat Racing Products Inc Rigid driver axle with cambered wheel hubs
US5197786A (en) * 1991-10-04 1993-03-30 National Racing Products, Inc. Rigid drive axle with cambered wheel hubs
US5398454A (en) * 1992-07-14 1995-03-21 Robert Bosch Gmbh Surface grinding machine
US5366286A (en) * 1993-01-19 1994-11-22 Maweva Holding Ag (Ltd.) Wand-type hand mixer having a removable mixing head
US5595541A (en) * 1993-11-19 1997-01-21 P.I.V. S.A. Flexible adjustable shaft coupling
US5890965A (en) * 1994-11-14 1999-04-06 Maag Getriebe Ab Dry coupling
US6123157A (en) * 1994-12-29 2000-09-26 Ergonomics Specialties Anti-vibration adaptor
US5810472A (en) * 1995-02-13 1998-09-22 Braun Aktiengesellschaft Hand blender for mixing or comminuting foodstuffs with an air supply structure
US5716279A (en) * 1995-11-21 1998-02-10 Itt Automotive Electrical Systems, Inc. Apparatus and method for coupling an output shaft of a motor to a secondary shaft
US6283868B1 (en) * 1998-06-17 2001-09-04 The Gates Corporation Flexible shaft coupling element and flexible couplings incorporating same
US6671475B2 (en) * 2000-01-17 2003-12-30 Konica Corporation Drive power transmission device, image forming apparatus and process cartridge
US6506120B1 (en) * 2000-08-10 2003-01-14 Dirk Lockwood Flexible shaft coupling
US6843727B2 (en) * 2003-02-21 2005-01-18 Rexnord Industries, Inc. Flexible wrap-type shaft coupling
US20040253912A1 (en) * 2003-06-16 2004-12-16 Ratko Menjak Double flank delash gear mechanism
US7383750B2 (en) * 2003-06-16 2008-06-10 Delphi Technologies, Inc. Double flank delash gear mechanism
US7763336B2 (en) * 2004-05-20 2010-07-27 The Gates Corporation Flexible coupling sleeve and a flexible shaft coupling incorporating same
US20060105844A1 (en) * 2004-11-17 2006-05-18 Sweet Roger L Flexible drive adapter
US7625290B2 (en) * 2006-07-05 2009-12-01 The Gates Corporation Sleeve-type flexible shaft coupling
US8096212B2 (en) * 2009-10-13 2012-01-17 Cheng-Wei Su Two-section tool joint
US20110197719A1 (en) * 2010-02-16 2011-08-18 Neitzell Roger D Driver accessory
US20160207178A1 (en) * 2013-08-23 2016-07-21 Positec Power Tools (Suzhou) Co., Ltd Power tool
US9642494B1 (en) * 2013-10-21 2017-05-09 Kevin Brun Radial immersion blender
US9441678B2 (en) * 2014-02-13 2016-09-13 Matt Nelson Shearable drive coupling assembly
US9976332B2 (en) * 2014-06-27 2018-05-22 Magna Closures Inc. Electromechanical strut with integrated flex coupling and slip device and clutch/coupling assembly therefor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220152807A1 (en) * 2015-06-30 2022-05-19 Atlas Copco Industrial Technique Ab Electric power tool
US11701768B2 (en) * 2015-06-30 2023-07-18 Atlas Copco Industrial Technique Ab Electric power tool

Also Published As

Publication number Publication date
JP6829713B2 (ja) 2021-02-10
JP2018519178A (ja) 2018-07-19
EP3317050B1 (en) 2019-12-18
US20220152807A1 (en) 2022-05-19
US11701768B2 (en) 2023-07-18
KR102509250B1 (ko) 2023-03-14
EP3317050A1 (en) 2018-05-09
CN107848100B (zh) 2021-07-09
CN107848100A (zh) 2018-03-27
SE1550912A1 (sv) 2016-11-08
WO2017001176A1 (en) 2017-01-05
KR20180023960A (ko) 2018-03-07
SE538749C2 (sv) 2016-11-08

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