SE1550912A1 - Electric power tool - Google Patents

Electric power tool Download PDF

Info

Publication number
SE1550912A1
SE1550912A1 SE1550912A SE1550912A SE1550912A1 SE 1550912 A1 SE1550912 A1 SE 1550912A1 SE 1550912 A SE1550912 A SE 1550912A SE 1550912 A SE1550912 A SE 1550912A SE 1550912 A1 SE1550912 A1 SE 1550912A1
Authority
SE
Sweden
Prior art keywords
gear
motor
input gear
shaft portion
tool according
Prior art date
Application number
SE1550912A
Other languages
English (en)
Other versions
SE538749C2 (sv
Inventor
GÖRAN JOHANSSON Karl
Original Assignee
Atlas Copco Ind 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 Ind Technique Ab filed Critical Atlas Copco Ind Technique Ab
Priority to SE1550912A priority Critical patent/SE538749C2/sv
Priority to EP16730324.7A priority patent/EP3317050B1/en
Priority to PCT/EP2016/063474 priority patent/WO2017001176A1/en
Priority to CN201680037930.1A priority patent/CN107848100B/zh
Priority to JP2018500324A priority patent/JP6829713B2/ja
Priority to KR1020187002220A priority patent/KR102509250B1/ko
Priority to US15/578,016 priority patent/US20180290284A1/en
Publication of SE1550912A1 publication Critical patent/SE1550912A1/sv
Publication of SE538749C2 publication Critical patent/SE538749C2/sv
Priority to US17/589,183 priority patent/US11701768B2/en

Links

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
    • 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
    • B25B23/0007—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

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)

Description

Summary of the invention 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.
This object is achieved by the invention according to claim l, which relates to 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.
Further, with this arrangement 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.
Other features and advantages of the invention will be apparent from the independent claims and from the detailed description of the shown embodiment.
Short description of the drawings In the following detailed description reference is made to the accompanying drawings, of which: 10 15 20 25 30 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; and Fig. 4 is an exploded view of a coupling in accordance with the invention.
Detailed description of the shown embodiment of the invention In 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. In the shown embodiment 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.
In figure 2 a sectional view of the power transmission of the power tool 10 is shown. In the shown embodiment 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 10 15 20 25 30 to the housing. Hence, 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. 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 figures 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.
As is shown in figure 4 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.
In the shown embodiment 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 10 15 20 25 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. Advantageously, the splined connective portions 26 of the coupling are plastic parts that are fitted inside the shaft portion 25. Preferably 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. Further though, 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.
Above, the invention has been described with reference to a specific embodiment. The invention is however not limited to this embodiment.
It is obvious to a person skilled in the art that the invention comprises further embodiments within its scope of protection, which is defined by the following claims.

Claims (7)

10 15 20 25 30 Claims
1. An electric power tool (10) comprising: - an electric motor (11) with a motor gear (l5); - an output shaft (13) with an input gear (16); - a coupling (17) that connects the motor gear (15) to the input gear (16); - a housing (18) that houses the motor (11), motor gear (15), coupling (17) and input gear, characterised in that the coupling (17) includes a shaft portion (25) and two connective portions (26) arranged at opposite ends of the shaft portion for connection to the (15) (16), wherein at least motor gear and input gear (15) respectively, (16) has a cambered (17) (15) one of the motor gear and the input gear 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 (16) that has a cambered profile.
2. The electric power tool according to claim 1, wherein both the motor gear (15) and the input gear (16) have a cambered gear profile.
3. The electric power tool according to claim 2, wherein both the connective portions (26) include splines for meshing connection to the motor gear (15) and input gear (16), respectively.
4. The electric power tool according to claim 3, wherein the two opposed connective portions (26) of the coupling are plastic parts that are fitted inside the shaft portion (25).
5. The electric power tool according to claim 4, wherein the shaft portion (25) is tube shaped. 6. The electric power tool according to claim 5, wherein the connective portions (26) are press fitted inside the shaft portion (25). 7. The electric power tool according to claim 6, wherein the connective portions (26) 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. Patentansökan nr / Patent application No: 1550912-8 I följande bilaga finns en översättning av patentkraven till svenska. Observera att det är patentkravens lydelse på engelska som gäller. A Swedish translation of the patent claims is enclosed. Please note that only the English elaims have legal effect. Krav Ett elektriskt kraftverktyg (10) innefattande: en elektrisk motor (11) med ett motorkugghjul (l5); en utgående axel (13) med ett ingångskugghjul (16) en koppling (17) som förbinder motorkugghjulet (15) till det ingående kugghjulet (l6); ett hus (18) som inrymmer motorn (11), motorkugghjulet (15), kopplingen (17) och ingångskugghjulet, kånnetecknad av att kopplingen (17) innefattar en skaftdel (25) och två sammanbindande partier (26) anordnade vid motsatta ändar av axelpartiet för anslutning till respektive motorkugghjulet (15) och det ingående kugghjulet (16), varvid åtminstone ett av motorkugghjulet (15) och det ingående kugghjulet (16) har en böjd profil som tillåter en tipprörelse av kopplingen (17) med avseende på den axiella positionen för en av motorkugghjulet (15) och det ingående kugghjulet (16) som har en böjd profil. 2. Det elektriska motorverktyget enligt krav 1, varvid både motorkugghjulet (15) och det ingående kugghjulet (16) har en böjd kugghjulsprofil. 3. Det elektriska motorverktyget enligt krav 2, varvid både de san? nbindande partierna (26) innefattar splines för ikuggning till respektive moitcmfikugg'hjj 11.1.6211 (15) ocIh det .ir1<_;'å.san-:ie k.u<_;'g'š1jjul_eaï: (16) . 4. Det lektriska motorverktyget enligt krav 3, varvid de två motstàende samm>nbindande partierna (26) hos kopplingen är plastdelar som är monterade på insidan av skaftdelen (25). 5, Det elektriska motorverktyget enligt krav 4, varvid axelpartiet (25) är rörformad.
6. Det elektriska motoïverktyget enligt krav 5, varvic de sïmmanbindande 2 _11 païtierna ) är presspassat inuti skaftdelfln (25).
7. Det de sam.anbindande V' Ei. I' \J partierna (26) innefattar urtag (SJ), i vilk;n "rníngarna (31) hos J) passar for att låsa de sammanbindande delarna (26) och axelpartiet (25) fïån inböxdes rotation.
SE1550912A 2015-06-30 2015-06-30 Electric power tool SE538749C2 (sv)

Priority Applications (8)

Application Number Priority Date Filing Date Title
SE1550912A SE538749C2 (sv) 2015-06-30 2015-06-30 Electric power tool
EP16730324.7A EP3317050B1 (en) 2015-06-30 2016-06-13 Electric power tool
PCT/EP2016/063474 WO2017001176A1 (en) 2015-06-30 2016-06-13 Electric power tool
CN201680037930.1A CN107848100B (zh) 2015-06-30 2016-06-13 电动工具
JP2018500324A JP6829713B2 (ja) 2015-06-30 2016-06-13 電動工具
KR1020187002220A KR102509250B1 (ko) 2015-06-30 2016-06-13 전기식 전동 공구
US15/578,016 US20180290284A1 (en) 2015-06-30 2016-06-13 Electric power tool
US17/589,183 US11701768B2 (en) 2015-06-30 2022-01-31 Electric power tool

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE1550912A SE538749C2 (sv) 2015-06-30 2015-06-30 Electric power tool

Publications (2)

Publication Number Publication Date
SE1550912A1 true SE1550912A1 (sv) 2016-11-08
SE538749C2 SE538749C2 (sv) 2016-11-08

Family

ID=56137303

Family Applications (1)

Application Number Title Priority Date Filing Date
SE1550912A SE538749C2 (sv) 2015-06-30 2015-06-30 Electric power tool

Country Status (7)

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

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE538749C2 (sv) * 2015-06-30 2016-11-08 Atlas Copco Ind Technique Ab Electric power tool

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Also Published As

Publication number Publication date
CN107848100A (zh) 2018-03-27
JP6829713B2 (ja) 2021-02-10
JP2018519178A (ja) 2018-07-19
EP3317050B1 (en) 2019-12-18
KR20180023960A (ko) 2018-03-07
US11701768B2 (en) 2023-07-18
EP3317050A1 (en) 2018-05-09
WO2017001176A1 (en) 2017-01-05
KR102509250B1 (ko) 2023-03-14
US20220152807A1 (en) 2022-05-19
US20180290284A1 (en) 2018-10-11
CN107848100B (zh) 2021-07-09
SE538749C2 (sv) 2016-11-08

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