EP2075094B1 - Outil électrique rotatif avec une interface entre le moteur et le réducteur, qui facilite l'assemblage - Google Patents

Outil électrique rotatif avec une interface entre le moteur et le réducteur, qui facilite l'assemblage Download PDF

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Publication number
EP2075094B1
EP2075094B1 EP20070124144 EP07124144A EP2075094B1 EP 2075094 B1 EP2075094 B1 EP 2075094B1 EP 20070124144 EP20070124144 EP 20070124144 EP 07124144 A EP07124144 A EP 07124144A EP 2075094 B1 EP2075094 B1 EP 2075094B1
Authority
EP
European Patent Office
Prior art keywords
gearbox
motor
protrusion
cavity
power tool
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.)
Not-in-force
Application number
EP20070124144
Other languages
German (de)
English (en)
Other versions
EP2075094A1 (fr
Inventor
Chi Hoe Leong
Daniel Brogli
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Priority to DE200760012739 priority Critical patent/DE602007012739D1/de
Priority to EP20070124144 priority patent/EP2075094B1/fr
Publication of EP2075094A1 publication Critical patent/EP2075094A1/fr
Application granted granted Critical
Publication of EP2075094B1 publication Critical patent/EP2075094B1/fr
Not-in-force 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
    • 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
    • B25F5/02—Construction of casings, bodies or handles
    • 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
    • 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

Definitions

  • the invention relates to the interface between a motor and a gearbox in a rotary power tool.
  • Impact drivers are rotary power tools used for high torque driving applications.
  • the gearbox is preferably securely mounted to the motor to prevent rotation and unnecessary vibration during high torque impacts.
  • US 5,624,000 A discloses a power tool including a modular drive system in which the motor and the transmission consist of separate self-contained modular units which can be assembled together by simply sliding and rotating the motor housing and the transmission housing relative to each other. Guide pins extending from the transmission housing are inserted into guide holes in the motor housing to align the housings with each other.
  • a rotary tool comprising an output shaft having an axis of rotation, a motor, a gearbox, a first protrusion that is offset from the axis of rotation and protrudes from either one of the motor or the gearbox, a first cavity that is offset from the axis of rotation and is within either one of the motor or the gearbox, wherein the first protrusion is substantially within the first cavity.
  • the motor and gearbox are not able to substantially rotate relative to each other. This stabilizes the interface and limits vibration as well as stress on the tool housing during impacts that might occur when a hammer assembly or an external object acts on the rotary shaft. The more complementary the coupling, the less rotation and vibration is possible between the two parts.
  • Design possibilities are increased by the possibility of locating the first protrusion to either the motor or the gearbox. Naturally the corresponding first cavity should be implemented in the other corresponding part.
  • a secure coupling between the motor and gearbox results if both the first protrusion and the first cavity are shaped like a cylinder.
  • Such a shape permits easy axial movement for assembly and disassembly, but also allow the protrusion and cavity to be shaped with little play, so that there is little possible rotation around the axis of rotation of the output shaft.
  • the first protrusion is either the head of a screw or the head of a rivet
  • these elements can also provide the second function. If either the motor or the gearbox were not of unitary construction, these elements can also secure the motor or the gearbox end cap to the remaining parts of the motor or the gearbox housing. As such, less parts are necessary to accomplish diverse design objectives.
  • first protrusion is not intrinsic to the motor or to the gearbox
  • a single motor or gearbox design can be used to support several different numbers or types of protrusions. This gives greater flexibility in designing multiple different tools with possibly different tolerance requirements or requiring different possible orientations for assembly. It may be advantageous from a cost standpoint to redesign only the shape of the screw or rivet rather than the motor or gearbox. It also would be easier to increase or decrease the number of protrusions and cavities without significant change to the design.
  • the subassembly including the gearbox and motor can be secured to or oriented with the remainder of the tool, it is useful to provide the gearbox with means for securing or orienting the gearbox to the tool housing. Since the motor is closely coupled with the gearbox, means for separately securing the motor to the tool housing are less necessary.
  • the rotary tool is provided with a second protrusion that is offset from the axis of rotation and protrudes from either one of the motor or the gearbox, as well as with a second cavity that is offset from the axis of rotation and is within either one of the motor or the gearbox, wherein the second protrusion is substantially within the second cavity.
  • Having a second protrusion and cavity coupling may provide further stability to the motor and gearbox interface, so that there is even less vibration.
  • first protrusion can also be positioned in a second cavity while the second protrusion is positioned in the first cavity. If multiple orientations are possible, this should reduce the time necessary for manual assembly of the two parts.
  • first protrusion and second protrusion are substantially identically shaped so that the second protrusion is substantially complementary to the first cavity, then the gearbox to motor interface can be equally stable even in different orientations. The same is true if the first cavity and second cavity are substantially identically shaped so that the second cavity is substantially complementary to the first protrusion.
  • protrusions on either the gearbox or motor it is also possible to place one or more protrusions on the motor along with one or more protrusions on the gearbox, and also with the corresponding cavities located accordingly, such that the first protrusion and the second cavity are both associated with the same one of either the motor or the gearbox. This may be useful if hybrid shapes are necessary for manufacture or for overcoming other design obstacles.
  • a rotary power tool or more specifically an impact driver 10, is shown in Fig. 1 .
  • a rotary shaft 14 which is driven indirectly by a motor 16 and which has an axis of rotation 18.
  • the speed and torque output of the motor are modulated by a gear assembly 20.
  • the gear assembly 20 is housed together with an impact hammer assembly 22 in a closed module gearbox 24.
  • the impact hammer assembly 22 normally transmits rotational force to the output shaft 14 but is also capable of providing intermittent impacts to the same output shaft 14 under conditions where high torque is required.
  • the motor 16 and gearbox 24 are coupled with each other to form a larger sub-assembly that is shown in greater detail in Figs. 2 and 3 .
  • the gearbox 24 has a gearbox housing 26 to which is coupled a gearbox end cap 28.
  • Either metal or plastic would be suitable materials for the gearbox housing 26 and gearbox end cap 28, but both should preferably be constructed of the same type of material.
  • These aspects of the gearbox 24 can be of unitary construction, but separate parts do facilitate manufacture and assembly of the parts.
  • each side of the gearbox housing 26 has a ring-shaped protrusion 30 defining a cavity 32 which is in turn threaded for accommodating a fastener, such as a screw (not shown).
  • a U-shaped protrusion 34 extends from the bottom side of the gearbox 24. Even without a fastening element, the U-shaped protrusion 34 can be used to orient or secure the gearbox with respect to ribs or comparable features (not shown) that form a part of the tool housing 12.
  • the gearbox housing 26 is also provided with elevated ridges 36 stretching across particular arcs along its circumference.
  • These may also be used to orient the gearbox with complementary structures in the tool housing 12.
  • the shape and location of these securing means is customized to conform with the shape of the rotary tool housing 12.
  • alternative means or locations for these means may be equally effective in orienting and/or fastening the gearbox 24.
  • the gearbox end cap 28 actually surrounds the gear assembly 20. It also provides a seat for a ball bearing 38 that stabilizes a jackshaft 40 which transmits the output of the gear assembly 20 to the impact hammer assembly 22.
  • the ball bearing 38 is seated within a ring-shaped shelf 42 that protrudes out of the main face 44 of the end cap 28.
  • the gearbox end cap 28 is provided with several flanges 46 around its perimeter which cooperate with corresponding recesses 48 within the gearbox housing 26 to orient the gearbox end cap 28. The flanges 46 prevent relative rotation of the gearbox end cap 28 and the gearbox housing 26.
  • the gearbox end cap 28 does not need to be fastened to the gearbox housing 26 and instead is maintained in position via an axial force that compresses the entire assembly within the tool housing 12.
  • the main face 44 of the end cap 28 is provided with a central ring-shaped protrusion 50 defining a central orifice 52 (see Fig. 4 ).
  • a central ring-shaped protrusion 50 defining a central orifice 52 (see Fig. 4 ).
  • Intersecting both the ring-shaped shelf 42 and the central ring-shaped protrusion 50 are four smaller ring-shaped projections 54, each defining a cavity 56.
  • the motor 16 also has a motor housing 58 and a motor end cap 60 which may be of unitary construction as illustrated in Fig. 5 or comprised of separate parts which potentially facilitates manufacture and assembly of the motor 16.
  • Two laterally positioned brush covers 62 extend from the motor housing 58 through cavities (not shown) in the tool housing 12 for access to the brushes (not shown).
  • Each of four oblong cavities 64 provides a path for air to enter and/or exit the motor housing 58.
  • channels formed by ribs in the tool housing 12 can interact with and/or insert into the cavities 64, although in doing so they do not by themselves provide significant structural stability. Instead they mostly serve as a guide for channelling air to and from the motor 16.
  • the motor end cap is 60 also provided with four more oblong cavities 66 for providing additional air paths.
  • a ring-shaped extension 68 seats a bearing 70 that supports a motor shaft 72 that extends from the motor 16.
  • Motor shaft 72 is connectable via an interference press-fit to a pinion gear 74 that meshes with planetary gears 76 in the gearbox assembly 20.
  • Screws 78 or alternatively rivets 80 are secured to the motor end cap 56. Both screws 78 or rivets 80 can potentially be used to fasten motor end cap 60 to the motor housing 58 if these parts were not of unitary construction. However, the screw heads 82 or rivet heads 84 primarily serve a role as protrusions for cooperating with cavities 56 as will be described below.
  • pinion gear 74 is meshed with planetary gears 76 while ring-shaped extension 68 is interference press-fit into the orifice 52 defined by ring-shaped protrusion 50.
  • the screw heads 82 are completely within the cavities 56.
  • cavities 86 that are not fully enclosed (see Fig. 7 ). That is, they may result from a C-shaped projection 88 that does not define a fully enclosed cavity.
  • the screw heads 82 or rivet heads 84 might also not be cylinder-shaped, but instead be a generally cylinder-shaped screw head 90 with one or more extensions 92 deviating from that shape (see Fig. 8 ). If such a screw head 90 were found within cavity 86, the protrusion would be considered to be substantially within the cavity 86.
  • the number of cavities 56 and the number of screw heads 82 or rivet heads 84 acting as protrusions is preferably chosen in consideration of the desired orientation options.
  • each cavity 56 and each protrusion is symmetrical in shape and provided they are symmetrically provided on the respective end caps, a single cavity or protrusion permits assembly of the motor 16 and gearbox 24 in only one possible orientation. Two permit two orientations, while three permit three, and so on.
  • cavities 56 and/or protrusions may be desirable, however to make the cavities 56 and/or protrusions asymmetrical in shape or distribution, so that the number of possible orientations is further limited, even though there may be multiple cavities 56 or protrusions.
  • the cylinder-shaped screw heads 82 or rivet heads 84 preferably slide into the cylinder-shaped cavities 56 just like a piston in a combustion engine. Consistent with this analogy, there is very little play between the two parts, so the cavities 56 are very effective in orienting the screw heads 82 or rivet heads 84 to permit little rotational movement between the motor 16 and gearbox 24.
  • the ring-shaped shelf 42 serves as a blocking member to prevent unintentional mating of the screw heads 82 with the space in-between the various protrusions 54.
  • the subassembly of motor 16 and gearbox 24 is inserted into the tool housing 12.
  • the end bell 94 of the motor 16 helps to orient the subassembly and an O-ring 96 is provided in the space between the motor end face 98 and the tool housing 12, so that the entire subassembly is compressed in the axial direction.
  • This compression maintains the positioning of the screw heads 82 or rivet heads 84 into cavities 56, so that there can be no relative rotation between the motor 16 and gearbox 24.
  • this axial force also keeps the gearbox end cap 28 positioned in the gearbox housing 26.
  • the screw or rivet heads plus the corresponding cavities can take on a conic shape rather than a cylindrical shape. This may facilitate assembly in so far as the angled surfaces of the cavity might help to orient the protrusions for insertion into the cavities when the parts are assembled. However, there is less room for mismatch between the depth of the cavity and the protrusions measured in the axial direction. With the cylindrical design, even with tolerance errors, the motor 16 and gearbox 24 are well-stabilized against relative rotation.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)

Claims (12)

  1. Outil électrique rotatif comprenant :
    un arbre de sortie (14) ayant un axe de rotation (18) ;
    un moteur (16) ;
    un réducteur (24) ;
    une première saillie (82) qui est décalée par rapport à l'axe de rotation (18) et ressort soit du moteur (16) soit du réducteur (24) ;
    une première cavité (56) qui est décalée par rapport à l'axe de rotation (18) et est placée à l'intérieur soit du moteur (16) soit du réducteur (24) ;
    dans lequel la première saillie (82) est située sensiblement à l'intérieur de la première cavité (56) et la première cavité (56) est placée sensiblement de façon complémentaire à la première saillie (82) de sorte que le moteur (16) et le réducteur (24) ne peuvent pas tourner sensiblement l'un par rapport à l'autre ;
    caractérisé en ce que la première saillie (82) sert également de moyen de fixation d'un cache d'extrémité de moteur ou de réducteur (60) à un carter de moteur ou de réducteur (58).
  2. Outil électrique rotatif selon l'une quelconque des revendications précédentes, caractérisé en ce que la première saillie (82) ressort du moteur (16) et que la première cavité (56) est placée à l'intérieur du réducteur (24).
  3. Outil électrique rotatif selon l'une quelconque des revendications précédentes, caractérisé en ce que la première saillie (82) prend sensiblement une forme de cylindre.
  4. Outil électrique rotatif selon l'une quelconque des revendications précédentes, caractérisé en ce que la première cavité (56) prend sensiblement une forme de cylindre.
  5. Outil électrique rotatif selon l'une quelconque des revendications précédentes, caractérisé en ce que le réducteur (24) est pourvu de moyens (30, 34, 36) de fixation du réducteur (24) à un carter d'outil (12).
  6. Outil électrique rotatif selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il comprend en outre :
    une seconde saillie (82) qui est décalée par rapport à l'axe de rotation (18) et ressort soit du moteur (16) soit du réducteur (24) ;
    une seconde cavité (56) qui est décalée par rapport à l'axe de rotation (18) et est placée à l'intérieur soit du moteur (16) soit du réducteur (24) ;
    dans lequel la seconde saillie (82) est positionnée sensiblement à l'intérieur de la seconde cavité (56).
  7. Outil électrique rotatif selon la revendication 6, caractérisé en ce que la première saillie (82) peut également être positionnée dans la seconde cavité (56) tandis que la seconde saillie (82) est positionnée dans la première cavité (56).
  8. Outil électrique rotatif selon l'une quelconque des revendications 6 ou 7, caractérisé en ce que la première saillie (82) et la seconde saillie (82) prennent des formes sensiblement identiques de sorte que la seconde saillie (82) est sensiblement complémentaire à la première cavité (56).
  9. Outil électrique rotatif selon l'une quelconque des revendications 6 ou 8, caractérisé en ce que la première cavité (56) et la seconde cavité (56) prennent des formes sensiblement identiques de sorte que la seconde cavité (56) est sensiblement complémentaire à la première saillie (82).
  10. Outil électrique rotatif selon l'une quelconque des revendications 6 à 9, caractérisé en ce que la première saillie (82) et la seconde cavité (56) sont toutes deux associées soit au moteur (16) soit au réducteur (24).
  11. Outil électrique rotatif selon l'une quelconque des revendications précédentes, caractérisé en ce que la première saillie (82) est une tête de vis (82) d'une vis (78) dont le filetage est vissé soit dans le moteur (16) soit dans le réducteur (24).
  12. Outil électrique rotatif selon l'une quelconque des revendications 1 à 10, caractérisé en ce que la première saillie (84) est une tête de rivet (84) d'un rivet (80) qui est fixé soit sur le moteur (16) soit sur le réducteur (24).
EP20070124144 2007-12-28 2007-12-28 Outil électrique rotatif avec une interface entre le moteur et le réducteur, qui facilite l'assemblage Not-in-force EP2075094B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE200760012739 DE602007012739D1 (de) 2007-12-28 2007-12-28 Drehkraftwerkzeug mit einer Schnittstelle zwischen dem Motor und dem Getriebe, die die Montage vereinfacht
EP20070124144 EP2075094B1 (fr) 2007-12-28 2007-12-28 Outil électrique rotatif avec une interface entre le moteur et le réducteur, qui facilite l'assemblage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20070124144 EP2075094B1 (fr) 2007-12-28 2007-12-28 Outil électrique rotatif avec une interface entre le moteur et le réducteur, qui facilite l'assemblage

Publications (2)

Publication Number Publication Date
EP2075094A1 EP2075094A1 (fr) 2009-07-01
EP2075094B1 true EP2075094B1 (fr) 2011-02-23

Family

ID=39314962

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20070124144 Not-in-force EP2075094B1 (fr) 2007-12-28 2007-12-28 Outil électrique rotatif avec une interface entre le moteur et le réducteur, qui facilite l'assemblage

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Country Link
EP (1) EP2075094B1 (fr)
DE (1) DE602007012739D1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11602832B2 (en) 2015-06-05 2023-03-14 Ingersoll-Rand Industrial U.S., Inc. Impact tools with ring gear alignment features
US11707831B2 (en) 2015-06-05 2023-07-25 Ingersoll-Rand Industrial U.S., Inc. Power tool housings
US11784538B2 (en) 2015-06-05 2023-10-10 Ingersoll-Rand Industrial U.S., Inc. Power tool user interfaces

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9221112B2 (en) 2010-03-10 2015-12-29 Milwaukee Electric Tool Corporation Motor mount for a power tool
AU2012205232B2 (en) * 2011-07-20 2015-02-05 Milwaukee Electric Tool Corporation Motor mount for a power tool
EP2921264B1 (fr) * 2014-03-20 2016-06-29 Black & Decker Inc. Marteau perforateur
WO2016196984A1 (fr) 2015-06-05 2016-12-08 Ingersoll-Rand Company Machines portatives à moteur à modes de fonctionnement sélectionnables par l'utilisateur
WO2016196905A1 (fr) 2015-06-05 2016-12-08 Ingersoll-Rand Company Systèmes d'éclairages pour outils électriques
US10418879B2 (en) 2015-06-05 2019-09-17 Ingersoll-Rand Company Power tool user interfaces
EP3792005B1 (fr) * 2019-09-11 2023-06-07 Robert Bosch GmbH Machine-outil portative dotée d'une bride de réducteur
US11685036B2 (en) 2020-07-27 2023-06-27 Techtronic Cordless Gp Motor mounting assembly for a power tool
DE102022212839A1 (de) 2022-11-30 2024-06-06 Robert Bosch Gesellschaft mit beschränkter Haftung Handwerkzeugmaschine

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69530892T2 (de) 1994-07-26 2004-02-26 Black & Decker Inc., Newark Kraftwerkzeug mit modularem Antriebssystem und Verfahren zur Montage des modularen Antriebssystems
JP2005066804A (ja) 2003-08-27 2005-03-17 Ryobi Ltd 電動工具

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11602832B2 (en) 2015-06-05 2023-03-14 Ingersoll-Rand Industrial U.S., Inc. Impact tools with ring gear alignment features
US11707831B2 (en) 2015-06-05 2023-07-25 Ingersoll-Rand Industrial U.S., Inc. Power tool housings
US11784538B2 (en) 2015-06-05 2023-10-10 Ingersoll-Rand Industrial U.S., Inc. Power tool user interfaces

Also Published As

Publication number Publication date
DE602007012739D1 (de) 2011-04-07
EP2075094A1 (fr) 2009-07-01

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