EP4072790A1 - Outil électrique portatif - Google Patents

Outil électrique portatif

Info

Publication number
EP4072790A1
EP4072790A1 EP20821181.3A EP20821181A EP4072790A1 EP 4072790 A1 EP4072790 A1 EP 4072790A1 EP 20821181 A EP20821181 A EP 20821181A EP 4072790 A1 EP4072790 A1 EP 4072790A1
Authority
EP
European Patent Office
Prior art keywords
housing
machine tool
hand machine
guide
motor
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.)
Granted
Application number
EP20821181.3A
Other languages
German (de)
English (en)
Other versions
EP4072790B1 (fr
Inventor
Horst Fahrner
Jürgen Blickle
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.)
C&E Fein GmbH and Co
Original Assignee
C&E Fein GmbH and Co
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 C&E Fein GmbH and Co filed Critical C&E Fein GmbH and Co
Publication of EP4072790A1 publication Critical patent/EP4072790A1/fr
Application granted granted Critical
Publication of EP4072790B1 publication Critical patent/EP4072790B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • 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
    • B25F5/006—Vibration damping means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/02—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/02—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor
    • B24B23/028—Angle tools

Definitions

  • the invention relates to an electric hand tool, in particular an angle grinder, with a housing in which an electric motor is accommodated, which drives a rotor shaft which is connected in a force-transmitting manner to an output unit accommodated in a gear head.
  • Such handheld power tools have long been known from the prior art, for example from EP 2873493 A2.
  • the electric motor is usually received and stored in the housing, the electric motor often being designed as an EC motor and thus comprising a stator with several windings and a rotor with a rotor shaft, the rotor being rotatable about an axis of rotation in the stator is stored.
  • a laminated rotor core with a plurality of permanent magnets is held on the rotor shaft, so that a rotating field can be generated in the stator by suitable control, which drives the rotor in order to drive an insert tool, for example a grinding wheel.
  • the gear head is screwed tightly to the housing, but there is the problem that the alignment of the gear head with respect to the rotor shaft is often imprecise. However, this then harbors the problem that this adversely affects the service life of the handheld power tool.
  • the present invention is therefore based on the object of reducing the aforementioned disadvantages and providing an improved handheld power tool.
  • a housing ring which provides at least one guide section for the gear head and a guide for the electric motor, an air guide section being formed on the side of the housing ring facing away from the housing is, in which a fan attached to the rotor shaft is accommodated.
  • the guide is arranged concentrically to the at least one guide section. This particularly further benefits the gear head and the electric motor are aligned with each other.
  • concentric is in particular also understood to mean that the center points of the guide and those of the at least one guide section lie on a common axis, and it has been shown to be particularly preferred if these lie on the axis of rotation.
  • the housing ring is arranged axially staggered between the housing and the gear head. This has advantages in terms of assembly technology, in particular, which make it easier to connect the gear head to the housing. This means that the gear head is not in direct contact with the housing, but is spaced and separated from the housing by the housing ring.
  • the side of the housing ring facing away from the housing is assigned an axial collar on which the at least one guide section for the gear head is formed.
  • an additional guide is provided for the gear head, which also favors centering and alignment of the gear head with respect to the housing ring.
  • the number of guide sections is preferably two or more, preferably three or more and more preferably six or less, preferably five or less and particularly preferably four.
  • the guide sections are formed like a circular arc, and if the angle of the individual guide sections is preferably 10 ° or more, preferably 20 ° or more, particularly preferably 25 ° or more and more preferably 50 ° or less, preferably 40 ° or less and particularly preferably 35 ° or less and very particularly preferably 30 °, then it is possible to further reduce the manufacturing cost.
  • the total angle of the guide sections is preferably 60 ° or more, preferably 80 ° or more, particularly preferably 100 ° or more and more preferably 250 ° or less, preferably 180 ° or less and particularly preferably 150 ° or less and very particularly preferably 120 °. This means that only a few areas of the axial collar have to be adapted to the shape of the gear head.
  • the guide is formed on the side of the housing ring facing the housing.
  • the result of the guidance is that the electric motor can be guided in the housing ring but can also be secured and centered radially, so that this ultimately further improves the alignment of the electric motor with respect to the gear head.
  • the guide comprises a contact surface for supporting an end face of the electric motor. This also promotes the alignment of the electric motor relative to the housing ring.
  • the guide is formed as an annular axial web.
  • the annular axial web provides a flat, radial guide in the form of a hollow cylinder for the electric motor, which has a positive effect on the alignment and centering of the electric motor.
  • Assembly can also be facilitated by the fact that the axial web has an insertion bevel on the inner circumference. What is achieved hereby in particular is that the electric motor can be inserted into the guide in a simplified manner. The alignment of the electric motor relative to the gear head is further promoted by the fact that the housing ring is screwed to the electric motor via a motor screw connection. In this context, it has proven useful if the number of screws of the motor screw connection is preferably two or more and more preferably four or less and preferably three. In addition, the electric motor connected to the housing ring can be easily installed as a result.
  • the electric motor is assigned a motor housing in which receptacles are formed into which the screws of the motor screw connection are screwed. This ensures that there is sufficient space to form the threads.
  • the motor housing provides electrical insulation from the stator of the electric motor, which ensures that the housing ring is double insulated from the stator.
  • the screws are screwed into another part of the electric motor, for example into the stator of the electric motor.
  • the receptacles formed in the motor housing extend essentially over the entire length of the motor housing. This has the advantage that the receptacle can serve to receive screws from both sides and can therefore also be used to screw, for example, an end cap to the motor housing.
  • the housing comprises a first housing part and a second housing part, this has a positive effect on the assembly effort Hand tool according to the invention, since the two housing parts can be easily connected to one another.
  • the housing ring connects the first housing part to the second housing part on the end face. This ensures that the position of the two housing parts with respect to one another is secured without the two housing parts having to be screwed transversely to the rotor shaft in the end-face area that adjoins the gear head. In this way, in particular, a small gripping dimension can then be achieved.
  • the housing ring at least partially overlaps the first housing part and / or the second housing part on the outer circumference side.
  • the two housing parts are ultimately held from the outside, which further increases the securing effect and at the same time also allows the two housing parts to be centered with respect to one another.
  • the housing ring is overlapped by the two housing parts.
  • the housing ring is screwed to the first housing part and / or the second housing part, the screwing taking place parallel to the rotor shaft.
  • the two housing parts are firmly connected to the housing ring in their end-face areas, which has a positive effect on the mechanical load-bearing capacity of the entire housing.
  • the number of screws of the screw connection is preferably three or more and more preferably five or less and preferably four.
  • at least two screw receptacles are formed in each of the first housing part and in the second housing part, into which the screws of the screw connection are screwed. It has also proven particularly useful when the screw connection is made through the gear head. This then ultimately forms a unit that consists of the gear head, housing ring and the two housing parts and is secured by the screw connection.
  • the housing is vibration-decoupled from the housing ring and / or the gear head. This ensures that the vibrations that occur during operation of the handheld power tool are not transmitted to the housing and thus cannot have a disadvantageous effect on the user of the handheld power tool.
  • the housing ring is formed as a housing pot which forms a receiving space which at least partially accommodates the electric motor.
  • the Housing ring so in particular be extended axially and ultimately formed as a pot in which the electric motor is at least partially accommodated.
  • FIG. 1 shows a sectional view along a longitudinal section through a first embodiment of the handheld power tool
  • FIG. 2 shows a perspective exploded view of the first embodiment of the hand power tool
  • FIG. 3 shows a perspective view of a first side of a housing ring of the handheld power tool
  • FIG. 4 shows a perspective view of a second side of the housing ring of the flange machine tool
  • FIG. 5 is a perspective view of a cup-shaped housing ring.
  • FIG. 1 shows, in a sectional view along a longitudinal section, an electric handheld power tool 1, which is shown in FIG
  • Embodiment is formed as a wired angle grinder 2, which is usually operated with voltages between 80 V and 280 V.
  • the handheld power tool 1 has a housing 3 which comprises a first housing part 4 and a second housing part 5, both of which are ultimately formed as half-shells.
  • an electric motor 6 is received, which is designed as an EC motor and one of several Stator 8 having windings 7 and a rotor 9, which is rotatably mounted inside the stator 8 about an axis of rotation 10.
  • the electric motor 6 drives a rotor shaft 11 which is connected to the rotor 9 and which is connected in a force-transmitting manner to an output unit 13 accommodated in a gear head 12.
  • An insert tool 14 which in the present case is designed as a grinding wheel 15, is driven by the output unit 13.
  • a housing ring 16 is arranged, which at least partially overlaps the first housing part 4 and the second housing part 5 on the outer circumference and thus ultimately clamps them.
  • these housing screws 17.1 are arranged perpendicular to the rotor shaft 11, specifically in the area of the housing 3, which faces away from the housing ring 16.
  • the housing ring 16 is screwed to the first housing part 4 and the second housing part 5, the screwing taking place parallel to the rotor shaft 11.
  • screw domes 18 arranged perpendicular to the rotor shaft 11 in the first housing part 4 and the second housing part 5 in the frontal area, in which the electric motor 6 is also accommodated, can be dispensed with.
  • four screws 17.2 are used for the screw connection, which are screwed from the gear head 12 and ultimately connect the gear head 12, the housing ring 16 and the first housing part 4 and the second housing part 5 to one another.
  • two screw receptacles 19 are formed in the first housing part 4 and in the second housing part 5, into which the Screws 17.2 of the screw connection are screwed in.
  • the housing 3 is decoupled from vibrations with respect to the housing ring 16 and the gear head 12.
  • corresponding damping elements 20 are provided, which are placed on the screws 17.2 and thus contribute to a corresponding damping and decoupling of the housing 3.
  • this is screwed to the electric motor 6 via a motor screw connection.
  • a total of three motor screws 17.3 are used here, which are screwed from the side of the housing ring 16 facing the gear head 12 into receptacles 21 which are formed in a motor housing 22 in which the electric motor 6 is accommodated and encapsulated in a dust-tight manner.
  • These receptacles 21 extend essentially over the entire length of the motor housing 22 and, in addition to the fastening of the housing ring 16, also enable an end cap 23 to be fastened to the motor housing 22.
  • an air guide section 24 is formed in which a fan 25 fastened on the rotor shaft 11 is accommodated.
  • an axial collar 26 is formed on which a total of four guide sections 27 are formed for the gear head 12, which enable the gear head 12 to be aligned and centered with respect to the housing ring 16 and the housing 3.
  • the individual guide sections 27 are formed like a circular arc and each have an angle of around 30 °, so that the total angle of the four guide sections 27 is around 120 °.
  • To the Housing ring 16 also has a total of four screw feed-throughs 28 in which the screws 17.2 of the screw connection are received.
  • FIG. 4 shows that projections 29 are formed on the side of the housing ring 16 facing the housing 3 in the area of the screw feedthroughs 28.
  • these projections 29, which are shaped like segments of a circle at least partially cover the outer circumference of the screw receptacles 19, which are formed in the first housing part 4 and in the second housing part 5.
  • FIG. 4 also shows that a guide 30 for the electric motor 6 is formed in the housing ring 16. This has a contact surface 31 on which the electric motor 6 can be supported.
  • the guide 30 is formed as an annular axial web 32 which has an insertion bevel 33 on the inner circumference and thus makes it easier to insert the electric motor 6 into the housing ring 16.
  • FIG. 5 shows a perspective view of a second embodiment of the housing ring 16. This differs from the first embodiment according to FIGS. 1 to 4 essentially in that the housing ring 16 is formed as a housing pot 34 which is at least partially closed on one end face, and a receiving space 35 forms, in which the electric motor 6 can be at least partially included.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Abstract

La présente invention concerne un outil électrique portatif (1), en particulier une meuleuse angulaire (2), comprenant un boîtier (3) équipé d'un moteur électrique (6) qui entraîne un arbre de rotor (11) qui est accouplé à une unité de sortie (13) reçue dans une tête d'engrenage (12) de manière à transmettre une force. Une bague de boîtier (16) comporte au moins une section de guidage (27) pour la tête d'engrenage (12) et un guide (30) pour le moteur électrique (6). Le côté de la bague de boîtier (16) opposé au boîtier (3) est équipé d'une section de guidage d'air (24) dans laquelle est reçu un ventilateur (25) fixé à l'arbre de rotor (11).
EP20821181.3A 2019-12-13 2020-12-08 Outil électrique portatif Active EP4072790B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE202019106969.4U DE202019106969U1 (de) 2019-12-13 2019-12-13 Elektrische Handwerkzeugmaschine
PCT/EP2020/085017 WO2021116076A1 (fr) 2019-12-13 2020-12-08 Outil électrique portatif

Publications (2)

Publication Number Publication Date
EP4072790A1 true EP4072790A1 (fr) 2022-10-19
EP4072790B1 EP4072790B1 (fr) 2024-03-13

Family

ID=73790097

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20821181.3A Active EP4072790B1 (fr) 2019-12-13 2020-12-08 Outil électrique portatif

Country Status (6)

Country Link
US (1) US12076846B2 (fr)
EP (1) EP4072790B1 (fr)
CN (1) CN114829074A (fr)
DE (1) DE202019106969U1 (fr)
ES (1) ES2979164T3 (fr)
WO (1) WO2021116076A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11691261B2 (en) * 2020-06-02 2023-07-04 Snap-On Incorporated Housing clamp for a power tool
DE102022210259A1 (de) * 2022-09-28 2024-03-28 Robert Bosch Gesellschaft mit beschränkter Haftung Handwerkzeugmaschine mit einem Positionierungsgerüst

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE59008112D1 (de) * 1989-07-15 1995-02-09 Kress Elektrik Gmbh & Co Elektrowerkzeug.
DE29501974U1 (de) * 1995-02-08 1996-06-05 Robert Bosch Gmbh, 70469 Stuttgart Elektrohandwerkzeugmaschine
JP2001009757A (ja) * 1999-06-28 2001-01-16 Makita Corp 電動工具
DE10314299B4 (de) * 2003-03-25 2016-09-01 Robert Bosch Gmbh Ankerlagerung für eine Elektromaschine
JP2008019757A (ja) * 2006-07-12 2008-01-31 Hitachi Ltd 内燃機関のバルブタイミング制御装置
DE102007043916A1 (de) * 2007-09-14 2009-04-02 Robert Bosch Gmbh Elektrohandwerkzeugmaschine
JP5447980B2 (ja) * 2010-07-16 2014-03-19 株式会社マキタ 電動工具におけるブレーキ機構の選択構造
WO2013002776A1 (fr) * 2011-06-29 2013-01-03 Ingersoll-Rand Company Outils motorisés à logements comportant des montures pour moteur élastiques et intégrées
US9314900B2 (en) 2013-10-18 2016-04-19 Black & Decker Inc. Handheld grinder with a brushless electric motor
DE102014103854A1 (de) * 2014-03-20 2015-09-24 C. & E. Fein Gmbh Handwerkzeug mit einer Lüftereinheit
EP3150333B1 (fr) * 2015-09-30 2019-08-28 Chervon (HK) Limited Outil electrique portatif comprenant un ensemble de freinage amélioré
US10226849B2 (en) * 2015-10-14 2019-03-12 Black & Decker Inc. Handheld grinder with brushless electric motor
DE102016215660A1 (de) * 2016-08-22 2018-02-22 Robert Bosch Gmbh Handwerkzeugmaschine und Verfahren zur Dämpfung einer Handwerkzeugmaschine
EP3290157B1 (fr) * 2016-08-29 2019-07-24 Nanjing Chervon Industry Co., Ltd. Meuleuse angulaire
CN108789283B (zh) * 2017-05-05 2021-11-19 南京德朔实业有限公司 扭力输出工具
JP6847763B2 (ja) * 2017-05-18 2021-03-24 株式会社マキタ 電動工具
JP6924634B2 (ja) * 2017-07-03 2021-08-25 株式会社マキタ 電動工具
DE102018107808A1 (de) 2018-04-03 2019-10-10 C. & E. Fein Gmbh Handwerkzeugmaschine
DE202019106967U1 (de) * 2019-12-13 2021-03-16 C. & E. Fein Gmbh Elektrische Handwerkzeugmaschine

Also Published As

Publication number Publication date
EP4072790B1 (fr) 2024-03-13
CN114829074A (zh) 2022-07-29
DE202019106969U1 (de) 2021-03-16
WO2021116076A8 (fr) 2022-07-14
WO2021116076A1 (fr) 2021-06-17
ES2979164T3 (es) 2024-09-24
US12076846B2 (en) 2024-09-03
US20220297278A1 (en) 2022-09-22

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