EP4072789A1 - Outil à main électrique - Google Patents

Outil à main électrique

Info

Publication number
EP4072789A1
EP4072789A1 EP20821175.5A EP20821175A EP4072789A1 EP 4072789 A1 EP4072789 A1 EP 4072789A1 EP 20821175 A EP20821175 A EP 20821175A EP 4072789 A1 EP4072789 A1 EP 4072789A1
Authority
EP
European Patent Office
Prior art keywords
housing
machine tool
hand machine
motor
housing part
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
EP20821175.5A
Other languages
German (de)
English (en)
Other versions
EP4072789B1 (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 EP4072789A1 publication Critical patent/EP4072789A1/fr
Application granted granted Critical
Publication of EP4072789B1 publication Critical patent/EP4072789B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • 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
    • B24B47/00—Drives or gearings; Equipment therefor
    • B24B47/10—Drives or gearings; Equipment therefor for rotating or reciprocating working-spindles carrying grinding wheels or workpieces
    • B24B47/12—Drives or gearings; Equipment therefor for rotating or reciprocating working-spindles carrying grinding wheels or workpieces by mechanical gearing or electric power

Definitions

  • the invention relates to an electric hand tool, in particular an angle grinder, with a housing that comprises a first housing part and a second housing part, with an electric motor accommodated in the housing, which drives a rotor shaft which is connected in a power-transmitting manner to an output unit accommodated in a gear head.
  • the first housing part and the second housing part are usually connected to one another by screws, which are screwed in perpendicular to the rotor shaft and thus connect the two housing parts to one another and secure them against one another.
  • the electric motor is received and stored, which is often designed as an EC motor and thus comprises a stator with several windings and a rotor with a rotor shaft, the rotor around a
  • the axis of rotation is rotatably mounted in the stator.
  • Laminated rotor core held with a plurality of permanent magnets, so that a rotating field can be generated in the stator by suitable control, which field drives the rotor in order to drive an insert tool, for example a grinding wheel.
  • the invention is therefore based on the object of reducing the above disadvantages and providing an improved handheld power tool.
  • this object is achieved in a handheld power tool of the type mentioned at the outset in that a housing ring is provided which connects the first housing part to the second housing part at the end.
  • the housing ring at least partially overlaps the first housing part and / or the second housing part on the outer circumference side. As a result, the two housing parts are ultimately held from the outside, which further intensifies the securing effect and at the same time also allows the two housing parts to be centered with respect to one another. In the context of the invention, however, it is also provided that the housing ring is overlapped by the two housing parts.
  • 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 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.
  • 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 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.
  • a guide for the motor is formed in the housing ring.
  • the result of the guidance is that the motor can be guided in the housing ring but can also be secured and centered radially, so that ultimately it is ensured that the Electric motor is aligned with respect to the housing and the gear head, which is particularly further promoted by the fact that the guide is arranged concentrically to the guide sections. This ensures that the gear head and the electric motor are also aligned with one another via the housing ring, with respect to which both the electric motor and the gear head are ultimately aligned.
  • concentric in particular also understood to mean that the center points of the guide and those of the guide sections lie on a common axis, whereby it has been shown to be particularly preferred if these lie on the axis of rotation.
  • 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 assembly can be further facilitated by the fact that the guide is formed as an annular axial web which 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 housing is further facilitated by the fact that the housing ring is screwed to the electric motor via a motor screw connection.
  • the number of screws of the motor screw connection is preferably two or more and more preferably four or less and preferably three.
  • the electric motor connected to the housing ring can thus 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 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 ring is formed as a housing pot which forms a receiving space which at least partially accommodates the electric motor.
  • the housing ring can in particular be extended axially and ultimately formed as a pot in which the electric motor is at least partially accommodated.
  • 1 shows a sectional view along a longitudinal section through a first embodiment of the handheld power tool
  • 2 is a perspective exploded view of the first embodiment of the flange machine tool
  • FIG. 3 shows a perspective view of a first side of a housing ring of the flange machine 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 electrical flat-bed machine tool 1 which, in the exemplary embodiment shown, is formed as a wired angle grinder 2 which is usually operated with voltages between 80 V and 280 V.
  • the flange machine 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 accommodated in the housing 3, which is designed as an EC motor and comprises a stator 8 having a plurality of windings 7 and a rotor 9 which is rotatably supported within 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.
  • By the output unit 13 is a
  • Insertion tool 14 which in the present case is formed as a grinding wheel 15, is driven.
  • 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 this ultimately jams.
  • 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. From the exploded view shown in FIG. 2, however, it can also be seen in particular that the housing 3 is decoupled from vibrations with respect to the housing ring 16 and the gear head 12. For this purpose, corresponding damping elements 20 are provided, which are placed on the screws 17.2 and thus contribute to a corresponding damping. In order to improve the centering of the electric motor 6 with respect to the housing ring 16, this is screwed to the electric motor 6 via a motor screw connection. A total of three motor screws 17.
  • receptacles 21 which are formed in a motor housing 22 in which the electric motor 6 is received 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 3 and the housing ring 16.
  • 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 formed on the housing ring 16, in which the screws 17.2 of the screw connection are received.
  • the perspective view of the housing ring 16 shown in 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 a segment of a circle at least partially cover the outer circumference of the screw receptacles 19 which are in the first housing part 4 and in the second housing part 5 are trained.
  • 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 attached to a
  • Front side is at least partially closed, and forms a receiving space 35 in which the electric motor 6 can be at least partially received.

Landscapes

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

Abstract

L'invention concerne un outil à main électrique (1), plus particulièrement un meuleuse d'angle (2), comportant un boîtier (3), qui comprend une première partie de boîtier (4) et une seconde partie de boîtier (5), avec un moteur électrique (6), qui est reçu dans le boîtier (3) et qui entraîne un arbre de rotor (11) qui est relié pour un transfert de force à une unité de sortie (13) reçue dans une tête de transmission (12). Une bague de boîtier (16) est utilisée pour relier la première partie de boîtier (4) à la seconde partie de boîtier (5) sur la face avant de celle-ci.
EP20821175.5A 2019-12-13 2020-12-08 Outil à main électrique Active EP4072789B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE202019106967.8U DE202019106967U1 (de) 2019-12-13 2019-12-13 Elektrische Handwerkzeugmaschine
PCT/EP2020/085002 WO2021116067A1 (fr) 2019-12-13 2020-12-08 Outil à main électrique

Publications (2)

Publication Number Publication Date
EP4072789A1 true EP4072789A1 (fr) 2022-10-19
EP4072789B1 EP4072789B1 (fr) 2024-03-20

Family

ID=73790091

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20821175.5A Active EP4072789B1 (fr) 2019-12-13 2020-12-08 Outil à main électrique

Country Status (5)

Country Link
US (1) US20220305607A1 (fr)
EP (1) EP4072789B1 (fr)
CN (1) CN114786880A (fr)
DE (1) DE202019106967U1 (fr)
WO (1) WO2021116067A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202019106969U1 (de) * 2019-12-13 2021-03-16 C. & E. Fein Gmbh Elektrische Handwerkzeugmaschine

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4730134A (en) * 1987-05-28 1988-03-08 The Singer Company Portable power tool with combination bearing plate, nut plate and auxiliary handle mount
DE102007017243A1 (de) * 2007-04-12 2008-10-16 Robert Bosch Gmbh Werkzeugmaschine, insbesondere Handwerkzeugmaschine
US7604528B2 (en) * 2008-02-28 2009-10-20 Techway Industrial Co., Ltd. Electric grinding gun
US9314900B2 (en) * 2013-10-18 2016-04-19 Black & Decker Inc. Handheld grinder with a brushless electric motor
US10226849B2 (en) * 2015-10-14 2019-03-12 Black & Decker Inc. Handheld grinder with brushless electric motor
DE102015121305A1 (de) * 2015-12-08 2017-06-08 Festool Gmbh Hand-Werkzeugmaschine
DE102016210853A1 (de) * 2016-06-17 2017-12-21 Robert Bosch Gmbh Handwerkzeugmaschine mit einer Kühleinheit
DE102016215660A1 (de) * 2016-08-22 2018-02-22 Robert Bosch Gmbh Handwerkzeugmaschine und Verfahren zur Dämpfung einer Handwerkzeugmaschine
JP6847763B2 (ja) * 2017-05-18 2021-03-24 株式会社マキタ 電動工具

Also Published As

Publication number Publication date
US20220305607A1 (en) 2022-09-29
EP4072789B1 (fr) 2024-03-20
WO2021116067A1 (fr) 2021-06-17
DE202019106967U1 (de) 2021-03-16
CN114786880A (zh) 2022-07-22

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