EP4072790B1 - Outil électrique portatif - Google Patents

Outil électrique portatif Download PDF

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Publication number
EP4072790B1
EP4072790B1 EP20821181.3A EP20821181A EP4072790B1 EP 4072790 B1 EP4072790 B1 EP 4072790B1 EP 20821181 A EP20821181 A EP 20821181A EP 4072790 B1 EP4072790 B1 EP 4072790B1
Authority
EP
European Patent Office
Prior art keywords
housing
hand
machine tool
held machine
guide
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.)
Active
Application number
EP20821181.3A
Other languages
German (de)
English (en)
Other versions
EP4072790A1 (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

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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
    • B25F5/006—Vibration damping means
    • 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
    • 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.
  • the electric motor is usually accommodated in the housing and stored therein, 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 rotor laminated 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 onto the housing, but this creates the problem that the alignment of the gear head towards the rotor shaft is often only imprecise. However, this then poses the problem that the service life of the hand-held power tool is adversely affected.
  • the preamble of claim 1 is from the US 2018/337575 A1 known.
  • JP 2019 013985 A EP 3 290 157 A2 , EP 3 549 717 A1 , US 2017/106490 A1 or JP 2001 009757 A disclosed.
  • the present invention is therefore based on the object of reducing the aforementioned disadvantages and providing an improved hand-held 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 further favors the gear head and the electric motor are aligned with each other.
  • concentric is also understood in particular 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 proven to be particularly preferred if they lie on the axis of rotation.
  • the housing ring is arranged in an axially staggered manner between the housing and the gear head. This has particular advantages in terms of assembly technology, 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. This provides an additional guide for the gear head, which also promotes centering and alignment of the gear head relative 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 most preferably 30°, then it is possible to further reduce the manufacturing effort.
  • 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 most preferably 120°. This means that only a few areas of the axial collar need to be adapted to the shape of the gear head.
  • the guide is designed on the side of the housing ring facing the housing.
  • the guidance ensures that the electric motor can be guided in the housing ring but can also be secured and centered radially, so that the alignment of the electric motor with respect to the gear head is ultimately further improved.
  • the guide includes 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.
  • the assembly can be further facilitated by the fact that the axial web has an insertion bevel on the inside circumference. This ensures, in particular, 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. It has proven useful in this context if the number of screws in the engine screw connection is preferably two or more and more preferably four or fewer and preferably three. In addition, the electric motor connected to the housing ring can be easily installed.
  • 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 enough space to form the threads.
  • this also has the advantage that the motor housing achieves electrical insulation from the stator of the electric motor, which ensures that the housing ring is doubly 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 holder can be used to hold screws from both sides and can therefore also be used, for example, to screw an end cap to the motor housing.
  • the housing comprises a first housing part and a second housing part, this has a positive influence on the assembly effort Hand tool according to the invention, since the two housing parts can be easily connected to each other.
  • the housing ring connects the first housing part to the second housing part at the end face. This ensures that the position of the two housing parts relative to one another is secured without the two housing parts having to be screwed transversely to the rotor shaft in the front area that borders the gear head. This makes it possible, in particular, to achieve a small gripping dimension.
  • the housing ring overlaps the first housing part and/or the second housing part at least partially on the outer circumference.
  • the two housing parts are ultimately held from the outside, which further strengthens the securing effect and at the same time also allows the two housing parts to be centered relative 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 front areas, which has a positive effect on the mechanical strength of the entire housing.
  • the number of screws in the screw connection is preferably three or more and more preferably five or fewer and preferably four.
  • 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 hand-held power tool are not transmitted to the housing and therefore cannot have a detrimental effect on the user of the hand-held power tool.
  • housing ring is formed as a housing pot, which forms a receiving space that at least partially accommodates the electric motor.
  • Housing ring can therefore be extended in particular axially and ultimately formed as a pot in which the electric motor is at least partially accommodated.
  • Figure 1 shows a sectional view along a longitudinal section of an electric hand-held power tool 1, which in the exemplary embodiment shown is formed as a cable-connected angle grinder 2, which is usually operated with voltages between 80 V and 280 V.
  • the hand-held power tool 1 has a housing 3, which includes a first housing part 4 and a second housing part 5, both of which are ultimately formed as half-shells.
  • the housing 3 accommodates an electric motor 6, which is designed as an EC motor and has several Windings 7 comprising stator 8 and a rotor 9, which is rotatably mounted within the stator 8 about an axis of rotation 10.
  • the electric motor 6 drives a rotor shaft 11 connected to the rotor 9, which is connected in a force-transmitting manner to an output unit 13 accommodated in a gear head 12.
  • the output unit 13 drives an insert tool 14, which in the present case is formed as a grinding wheel 15.
  • a housing ring 16 is arranged, which at least partially engages over the outer circumference of the first housing part 4 and the second housing part 5 and thereby ultimately clamps them.
  • housing screws 17.1 are arranged perpendicular to the rotor shaft 11, namely 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 front area, in which the electric motor 6 is also accommodated, can be dispensed with.
  • a total of 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 Indian Figure 2 it can also be seen in particular from the exploded view shown that the housing 3 is vibration-decoupled relative 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 appropriate damping and decoupling of the housing 3.
  • it 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 into receptacles 21 from the side of the housing ring 16 facing the gear head 12, which are formed in a motor housing 22 in which the electric motor 6 is accommodated and encapsulated in a dust-tight manner.
  • These recordings 21 extend essentially over the entire length of the motor housing 22 and, in addition to fastening 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 attached to the rotor shaft 11 is accommodated.
  • an axial collar 26 is formed on the side of the housing ring 16 facing the gear head 12, on which a total of four guide sections 27 are formed for the gear head 12, which enable alignment and centering of the gear head 12 relative 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°.
  • a total of four screw bushings 28 are also formed, in which the screws 17.2 of the screw connection are received.
  • Illustrated perspective view of the housing ring 16 can be seen that on the side of the housing ring 16 facing the housing 3 in the area of the screw bushings 28 projections 29 are formed. In the assembled state, these circular segment-shaped projections 29 at least partially cover the screw receptacles 19 on the outer circumference, which are formed in the first housing part 4 and in the second housing part 5.
  • 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 Figures 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 accommodated.

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)

Claims (23)

  1. Machine-outil manuelle (1) électrique, en particulier meuleuse d'angle (2), avec un boîtier (3), dans lequel est logé un moteur électrique (6) qui entraîne un arbre de rotor (11), qui est relié avec transmission de force à une unité de sortie (13) logée dans une tête d'engrenage (12), dans laquelle
    est prévue une bague de boîtier (16), qui fournit au moins une section de guidage (27) pour la tête d'engrenage (12) et un guide (30) pour le moteur électrique (6),
    une section de guidage d'air (24) est réalisée sur le côté de la bague de boîtier (16) orienté de manière à s"éloigner du boîtier (3), dans laquelle est logé un ventilateur (25) fixé sur l'arbre de rotor (11), caractérisée en ce qu'est associé, au côté de la bague de boîtier (16) orienté de manière à s'éloigner du boîtier (3), un collet axial (26), sur lequel l'au moins une section de guidage (27) est réalisée pour la tête d'engrenage (12).
  2. Machine-outil manuelle (1) selon la revendication 1, caractérisée en ce que le guide (30) est disposé de manière concentrique par rapport à l'au moins une section de guidage (27).
  3. Machine-outil manuelle (1) selon la revendication 1 ou 2, caractérisée en ce que la bague de boîtier (16) est disposée de manière étagée axialement entre le boîtier (3) et la tête d'engrenage (12).
  4. Machine-outil manuelle (1) selon l'une quelconque des revendications 1 à 3, caractérisée en ce que le nombre de sections de guidage (27) est de préférence de deux ou plus, de manière préférée de trois ou plus et par ailleurs de préférence de six ou moins, de manière préférée de cinq ou moins et de manière particulièrement préférée de quatre.
  5. Machine-outil manuelle (1) selon l'une quelconque des revendications 1 à 4, caractérisée en ce que les sections de guidage (27) sont formées en arc de cercle, et que l'angle des différentes sections de guidage (27) est de préférence de 10° ou plus, de manière préférée de 20° ou plus, de manière particulièrement préférée de 25° ou plus et par ailleurs de préférence de 50° ou moins, de manière préférée de 40° ou moins et de manière particulièrement préférée de 35° ou moins et de manière très particulièrement préférée de 30°.
  6. Machine-outil manuelle (1) selon la revendication 5, caractérisée en ce que l'angle total des sections de guidage (27) est de préférence de 60° ou plus, de manière préférée de 80° ou plus, de manière particulièrement préférée de 100° ou plus et par ailleurs de préférence de 250° ou moins, de manière préférée de 180° ou moins et de manière particulièrement préférée de 150° ou moins et de manière très particulièrement préférée de 120°.
  7. Machine-outil manuelle (1) selon l'une quelconque des revendications 1 à 6, caractérisée en ce que le guide (30) est réalisé sur le côté de la bague de boîtier (16) tourné vers le boîtier (3).
  8. Machine-outil manuelle (1) selon l'une quelconque des revendications 1 à 7, caractérisée en ce que le guide (30) comprend une surface d'appui (31) pour soutenir un côté frontal du moteur électrique (6).
  9. Machine-outil manuelle (1) selon l'une quelconque des revendications 1 à 8, caractérisée en ce que le guide (30) est formé en tant qu'un élément de liaison axial annulaire (32) .
  10. Machine-outil manuelle (1) selon la revendication 9, caractérisée en ce que l'élément de liaison axial (32) présente du côté périphérique intérieur un chanfrein d'introduction (33).
  11. Machine-outil manuelle (1) selon l'une quelconque des revendications 1 à 10, caractérisée en ce que la bague de boîtier (16) est vissée au moteur électrique (6) par l'intermédiaire d'un raccord vissé de moteur.
  12. Machine-outil manuelle (1) selon la revendication 11, caractérisée en ce que le nombre de vis moteur (17.3) du raccord vissé de moteur est de préférence de deux ou plus et par ailleurs de préférence de quatre ou moins et de manière préférée de trois.
  13. Machine-outil manuelle (1) selon l'une quelconque des revendications 1 à 12, caractérisée en ce qu'est associé au moteur électrique (6) un carter de moteur (22), dans lequel sont réalisés des logements (21), dans lesquels sont vissées les vis de moteur (17.3) du raccord vissé de moteur.
  14. Machine-outil manuelle (1) selon la revendication 13, caractérisée en ce que les logements (21) réalisés dans le carter de moteur (22) s'étendent sensiblement sur toute la longueur du carter de moteur (22).
  15. Machine-outil manuelle (1) selon l'une quelconque des revendications 1 à 14, caractérisée en ce que le boîtier (3) comprend une première partie de boîtier (4) et une deuxième partie de boîtier (5).
  16. Machine-outil manuelle (1) selon la revendication 15, caractérisée en ce que la bague de boîtier relie côté frontal la première partie de boîtier (4) à la deuxième partie de boîtier (5).
  17. Machine-outil manuelle (1) selon la revendication 15 ou 16, caractérisée en ce que la bague de boîtier (16) dépasse la première partie de boîtier (4) et/ou la deuxième partie de boîtier (5) au moins en partie du côté périphérique extérieur.
  18. Machine-outil manuelle (1) selon l'une quelconque des revendications 1 à 17, caractérisée en ce que la bague de boîtier (16) est vissée au boîtier (3), dans laquelle le vissage est effectué parallèlement à l'arbre de rotor (11).
  19. Machine-outil manuelle (1) selon la revendication 18, caractérisée en ce que le nombre de vis (17.2) du vissage est de préférence de trois ou plus et par ailleurs de préférence de cinq ou moins et de manière préférée de quatre.
  20. Machine-outil manuelle (1) selon la revendication 18 ou 19, caractérisée en ce que sont réalisés dans la première partie de boîtier (4) et dans la deuxième partie de boîtier (5) respectivement au moins deux logements de vis (19), dans lesquels les vis (17.2) du vissage sont vissées.
  21. Machine-outil manuelle (1) selon la revendication 20, caractérisée en ce que des saillies de type segment circulaire (29) sont réalisées sur le côté de la bague de boîtier (16) pointant vers le boîtier (3), qui recouvrent au moins en partie côté périphérique extérieur les logements de vis (19).
  22. Machine-outil manuelle (1) selon l'une quelconque des revendications 1 à 21, caractérisée en ce que le boîtier (3) est découplé des vibrations par rapport à la bague de boîtier (16) et/ou à la tête d'engrenage (12).
  23. Machine-outil manuelle (1) selon l'une quelconque des revendications 1 à 22, caractérisée en ce que la bague de boîtier (16) est formée comme un pot de boîtier (34) qui forme un espace de réception (35) recevant au moins en partie le moteur électrique (6).
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 EP4072790A1 (fr) 2022-10-19
EP4072790B1 true 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 (5)

Country Link
US (1) US20220297278A1 (fr)
EP (1) EP4072790B1 (fr)
CN (1) CN114829074A (fr)
DE (1) DE202019106969U1 (fr)
WO (1) WO2021116076A1 (fr)

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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

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JP2001009757A (ja) * 1999-06-28 2001-01-16 Makita Corp 電動工具

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ATE116490T1 (de) * 1989-07-15 1995-01-15 Kress Elektrik Gmbh & Co Elektrowerkzeug.
DE29501974U1 (de) * 1995-02-08 1996-06-05 Bosch Gmbh Robert Elektrohandwerkzeugmaschine
DE10314299B4 (de) * 2003-03-25 2016-09-01 Robert Bosch Gmbh Ankerlagerung für eine Elektromaschine
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EP3150333B1 (fr) * 2015-09-30 2019-08-28 Chervon (HK) Limited Outil electrique portatif comprenant un ensemble de freinage amélioré
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CN108789283B (zh) * 2017-05-05 2021-11-19 南京德朔实业有限公司 扭力输出工具
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Also Published As

Publication number Publication date
WO2021116076A1 (fr) 2021-06-17
WO2021116076A8 (fr) 2022-07-14
CN114829074A (zh) 2022-07-29
EP4072790A1 (fr) 2022-10-19
DE202019106969U1 (de) 2021-03-16
US20220297278A1 (en) 2022-09-22

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