EP2476520A2 - Machine-outil électrique, notamment une machine de ponçage ou de polissage - Google Patents

Machine-outil électrique, notamment une machine de ponçage ou de polissage Download PDF

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Publication number
EP2476520A2
EP2476520A2 EP11189077A EP11189077A EP2476520A2 EP 2476520 A2 EP2476520 A2 EP 2476520A2 EP 11189077 A EP11189077 A EP 11189077A EP 11189077 A EP11189077 A EP 11189077A EP 2476520 A2 EP2476520 A2 EP 2476520A2
Authority
EP
European Patent Office
Prior art keywords
housing
wall
power tool
air
drive
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
EP11189077A
Other languages
German (de)
English (en)
Other versions
EP2476520B1 (fr
EP2476520A3 (fr
Inventor
Jan Schulze
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.)
Metabowerke GmbH and Co
Original Assignee
Metabowerke 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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=43799337&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP2476520(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Metabowerke GmbH and Co filed Critical Metabowerke GmbH and Co
Publication of EP2476520A2 publication Critical patent/EP2476520A2/fr
Publication of EP2476520A3 publication Critical patent/EP2476520A3/fr
Application granted granted Critical
Publication of EP2476520B1 publication Critical patent/EP2476520B1/fr
Active legal-status Critical Current
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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
    • B25F5/008—Cooling 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
    • B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
    • B24B55/02—Equipment for cooling the grinding surfaces, e.g. devices for feeding coolant

Definitions

  • the present invention relates to a power tool, in particular a grinding or polishing machine, comprising a housing in which a drive, a fan unit and an electronic device are accommodated.
  • a power tool in particular a grinding or polishing machine
  • a fan unit With the help of the fan unit, an air flow for cooling the drive can be generated by ambient air is drawn through at least one air inlet opening in the housing.
  • at least one air channel is further formed, which extends in the flow direction of the air flow from the air inlet opening to the drive and allows a directed air supply to the drive.
  • a power tool according to the preamble to a battery (DC) - and / or a network (AC) -Electrotechnikmaschine, for example, a grinding or polishing machine or the like.
  • Such power tool machines have a housing in which components are accommodated, which generate heat as power loss, such as the drive or the electronic device. To dissipate the heat generated by these heat, a fan unit is provided which can generate a cooling air flow.
  • the power consumption of the power tool is limited by the heat accumulating within the housing, so that only with sufficient cooling is ensured that the power tool can exploit the entire performance space available to her.
  • the service life of the machine components of the power tool is improved by sufficient cooling.
  • the DE 10 2007 000 290 A1 discloses therefore to effect a targeted or directed air supply by means of air guide elements, which limit a Mauströmungspfad, via which at least a portion of the non-directional main air flow of the electronic device can be fed.
  • the electronic device is arranged in an end portion of the handle housing part facing away from the drive housing part.
  • An airflow is drawn into the housing via a plurality of housing slots by means of the fan device of the power tool and flows along a main flow path bounded by the drive housing part to the fan device.
  • the provided air guide elements are substantially perpendicular to the main flow direction along the drive motor and lead a side stream in the arranged substantially perpendicular to the drive housing housing of the handle portion.
  • the housing of the power tool is designed in several parts and comprises a gear housing, a motor housing and a handle housing, which are arranged one behind the other.
  • the handle housing in which the handle switch and the essential part of the electronic device is accommodated, is separated from the motor housing by intermediate walls.
  • the air intake slots for sucking in the cooling air are attached to the upstream engine housing, so that the entire electronic device, in particular the grip switch, do not come into contact with the cooling air.
  • a power tool according to the preamble is finally from the DE 10 2006 038 756 A1 in which a device for generating a cooling air flow is provided. At least one rigid and / or flexible air duct is arranged in the housing of the power tool, with one end of the air duct of the device for generating a cooling air flow and the other end of the air duct facing the heat-generating component. The air duct then conducts and distributes the air flow for cooling the heat source in the form of the electric motor.
  • the air ducts are composed of several individual parts, which are firmly flanged together. These are then used in the assembly of the power tool in the housing half shells of the housing.
  • a power tool comprising a housing in which a drive, a fan unit and an electronic device are accommodated, wherein with the aid of the fan unit an air flow for cooling the drive can be generated by ambient air drawn through at least one air inlet opening into the housing is formed, and wherein within the housing at least one air passage which extends in the flow direction of the air flow from the air inlet opening to the drive and allows a directed air supply to the drive.
  • the air inlet opening is arranged in an end region of the power tool, which faces away from the workpiece to be machined in a processing of a workpiece with the power tool.
  • the housing is at least sectionally double-walled formed with a housing inner wall and a housing outer wall spaced therefrom, wherein the air channel is bounded by the housing outer wall and the housing inner wall.
  • Such an air channel allows a directed air supply starting from the at least one air inlet opening up to the drive to be cooled.
  • a single air inlet opening may be provided with a single air duct.
  • at least two air inlet openings are preferred, wherein each air inlet opening is assigned an air channel.
  • the air inlet opening (s) is arranged in an end region of the electric machine tool, which faces away from the workpiece to be machined in a machining of a workpiece with the power tool, the risk of contamination by airborne dirt particles is already clear reduced. Due to the double-walled design of the housing in the region of the air channel with a housing outer wall and a housing inner wall spaced therefrom, the simplest possible and most cost-effective provision of a channel for a directed air supply is possible. The risk of unintentional damage or damage to the channel walls during assembly of the electric machine tool is significantly reduced in this way.
  • the electronics unit is accommodated in the housing (16) in such a way that it is at least partially separated from the air duct by the housing inner wall, ie that it is accommodated in the housing within the space delimited by the housing inner wall.
  • the housing inner wall bounds a substantially closed chamber, which is at least partially accommodated within the housing outer wall.
  • the design form in which the housing inner wall defines a substantially closed chamber is particularly advantageous, since this makes the provision of an electronics device encapsulated as such, as has become customary in practice (encapsulated switch) superfluous. Consequently, less expensive electronic components can be used for the electronic device without the risk of a reduced lifetime of the electronic device.
  • the housing outer wall may be formed as a lateral surface of a substantially cylindrical body which forms at least partially a handle portion of the power tool.
  • this is relatively simple and inexpensive and extends along a longitudinal axis.
  • the individual components ie, for example, the electronic device, the drive and the fan unit are arranged one behind the other within the housing.
  • At one end of the housing extends from this a drive shaft with a tool holder with which a kind of whatever tool, such as a grinding or polishing wheel, is connecting bar.
  • the handle portion of the power tool is intended to be enclosed by one or two hands of the user. The smaller the restrictions on the intended gripping area of the grip part, the less complicated is designed for a user handling, since he does not have to pay attention to where he may grasp the machine tool in the housing area and on which he should not do this.
  • the at least one air inlet opening may be formed on an end face of the housing through the clearance space between the housing wall and the housing inner wall.
  • the housing end face is not completely closed by the housing outer wall, but is open at least in the region of the air inlet opening.
  • the distance space is defined as the space that is bounded by the distance between the inner wall of the housing and the Gesimouseau- ⁇ enwand.
  • the air inlet opening or air inlet openings has at least one, preferably a plurality of, mutually parallel support ribs. These may also extend between the housing outer wall and the housing inner wall to support them against each other. In this way it is prevented that in a production of the housing made of a relatively soft material, such as from a deformable under low force plastic, the user can not close the air inlet opening by a too firm grip by deformation of the housing outer wall undesirable.
  • the at least one support rib extends along the entire air channel in the flow direction of the air flow.
  • the housing outer wall projects beyond the at least one air inlet opening at least in sections.
  • the housing shell wall does not terminate flush with the at least one support rib or with the support ribs of the at least one air inlet opening, but projects beyond it (in a direction away from the tool of the power tool machine).
  • the user unintentionally closes the at least one air inlet opening with his hand (for example the palm of his hand) when he grasps the grip part of the power tool.
  • the housing is formed in several parts and comprises at least two half-shells.
  • Particularly preferred is the so-called pot construction, in which the housing has a pot-like framework, to which the two half-shells and optionally further housing parts can be attached.
  • the power tool may comprise as drive an electric motor with a collector and means for electrically contacting the collector, wherein the air duct directs a directed to the means for electrically contacting the collector air flow.
  • Such means for electrically contacting the collector may include, for example carbon brushes or the like.
  • the present invention also relates to a housing for a power tool with the features of claims 1 to 10.
  • FIG. 1 shows a power tool according to the invention, which is generally designated by the reference numeral 10.
  • the electric machine tool 10 comprises a tool-side output 12 and one viewed along a longitudinal axis L.
  • the handle part 14 is formed on a housing 16 which comprises a plurality of housing parts 16 1 and 16 2 , wherein the housing part 16 1 is formed as a housing pot with a gripping portion 36 A and a mounting portion 36 B, attached to the two half-shell-shaped housing parts 16 2 can be.
  • the housing part 16 1 is formed as a housing pot with a gripping portion 36 A and a mounting portion 36 B, attached to the two half-shell-shaped housing parts 16 2 can be.
  • FIG. 1 only one such shell-shaped housing part 16 2 is mounted in the lower region, while the upper region shows the attachment section 36 B and the components of the power tool 10 housed therein.
  • housing 16 by a plurality of housing parts, which need not necessarily be formed in the form of a half shell or must be cup-shaped.
  • an electric motor 20 (in FIG. 1 only indicated) trained drive recorded, which can be activated and deactivated via a slide switch.
  • the slide switch on a switching element 18 which can be manually operated by a user.
  • the switching element 18 is, as in FIG. 1 is clearly shown, arranged in the grip region of the electric machine tool 10 on the outer peripheral surface of the housing 16.
  • Such an arrangement of the switching element 18 allows a simple and uncomplicated handling for a user, since he has to solve without the hand of the handle portion 14 of the electric machine tool 10, these can turn on and off by means of the switching element 18.
  • the drive of the present power tool 10 is, as mentioned above, designed as an electric motor 20 and conventionally comprises a rotor which is rotatable about the longitudinal axis L and fixed to a rotor output shaft (not shown), and a stator (not shown). that at least partially surrounds the rotor. Due to the geometry of the stator, an air gap is usually formed between the rotor and the stator of the electric motor 20. This allows ventilation of the electric motor and thus reduces power losses of the drive due to overheating.
  • the rotor output shaft is drivingly connected to a driven shaft 22.
  • This is centrally received in an attachment with a substantially cylindrical housing 22A and has at its free end a tool holder 22B for receiving an associated tool (not shown).
  • a transmission (not shown) may further be provided, which is received in a corresponding housing 34 in the illustrated embodiment.
  • Such a transmission allows a transmission or reduction of the transmitted from the motor drive and its driving shaft torque to the output 12th
  • a shift rod 30 is provided as a switching member of the Schallschiebers, which is connected to the switching element 18 and serves to turn the motor drive on and off.
  • an electronic unit 32 is additionally provided, which cooperates with the shift rod 30 and the electric motor 20 is only supplied with power when the switching element 18 is in a corresponding on position.
  • the electronic unit 32 for example, have a pressure switch which is biased by a pressure spring integrated into the pressure switch in a position in which the electronics unit 32, the motor drive 20 is not energized. To turn on the motor drive 20 by means of the activation unit 32, it is therefore necessary to press the pressure switch in the direction of the motor drive 20 against the action of the integrated spring.
  • the shift rod 30 takes on the task of transmitting a translational displacement of the switching element 18 along the longitudinal axis L to the pressure switch.
  • the electronics unit 32 is connected via a cable connection to a power grid.
  • a power supply with the help of a to be attached to the housing 16 or integrated battery.
  • the electric motor 20 is connected to a fan unit designed as a fan wheel 26 such that a rotational movement of the rotor shaft causes a rotational movement of the fan 26 results.
  • the fan 26 is formed in a conventional manner such that an air flow is generated by such a rotational movement, wherein within the housing 16, a suction chamber is formed.
  • the sucked air is discharged via air outlets 38 in the transmission housing 34 to the outside, as indicated by the arrow labeled LU.
  • the housing 16 of the handle portion 14 also has on its side facing away from the output 12 end air inlet openings 68, is sucked through the outside air into the housing 16, as indicated by the arrow drawn with LU.
  • FIGS. 2A and 2 B is a plan view of the power tool 10 according to the invention according to FIG. 1 shown, the FIG. 2B a detailed view of the in FIG. 2A Representing B section.
  • the FIG. 3 further shows one of the housing shells 16 2 in plan view.
  • the first cup-shaped housing part 16 1 has, in addition to its gripping surface forming a gripping portion 36 A (in FIG. 2A left) on a mounting portion 36 B, to which two half-shell-shaped housing parts 16 2 can be attached.
  • mounting recesses 48 are provided in the region of the fastening section 36B, in which corresponding fastening projections 46 of the housing shell parts 16 2 can engage (cf. FIG. 3 ).
  • the housing 16 In the housing 16 are two air channels 66 (in FIGS. 2A to 3 formed above and below), each by a Gezzauseau- ⁇ enwand 40 and a housing inner wall 50 are limited.
  • the housing outer wall 40 is formed as a lateral surface of a substantially cylindrical body which forms a rear section of the grip part 14 of the power tool 10.
  • each of the housing shells 16 2 specific compound geometries to ensure an exact alignment of the two housing shells 16 2 to each other at their connection with each other.
  • the lower housing shell 16 2 in FIGS. 2A to 3 shown) first recesses 54 and second recesses 56, can be added to the corresponding, for example, peg-shaped projections of the upper housing shell, not shown.
  • 54 screw receptacles 52 are formed on the first recesses, which extend concentrically to the first recesses 54 and allow the inclusion of fastening screws for connecting the housing half-shell parts 16 2 .
  • a cable recess 72 in the two housing shell parts 16 2 is provided on the front side.
  • an unillustrated electric cable may extend to the electronics unit 32 in the illustrated embodiment.
  • a groove 42 or corresponding projections are provided on the respective other housing half shell.
  • a special feature of the present invention is the fact that the housing inner walls define an inner housing chamber in which the electronic unit 32 is accommodated.
  • the housing inner walls 50 extend inwardly from the inner surface of the housing outer wall 40 so that this inner chamber for the electronics unit 32 is bounded not only by the housing inner walls 50 but also by the housing outer wall 40.
  • the housing inner wall 50 in an assembled state of the housing shells 16 2 also forms a circumferential lateral surface which is at least partially surrounded by the housing outer wall 40.
  • this inner chamber is bounded by an additional wall 60, which has a recess 62 for the shift rod 30 (cf., for example FIG. 3 ).
  • the housing half shells 16 2 as well as the housing pot 16 1 can usually be made of plastic, which can be prepared for example by means of injection molding. To stabilize the housing inner walls 50 may be cast on these support ribs 64A and 64B.
  • the air inlet openings 68 are arranged on the front side in an end region of the housing 16 and are formed by the gap between the outer housing wall 40 and the housing inner walls 50.
  • a plurality of support ribs 70 between the housing walls 40 and 50 are arranged. These are aligned substantially parallel to one another and each extend from the housing outer wall 40 to the adjacent housing inner wall 50.
  • the housing outer wall 40 is formed in the end-side end region with a projection 44 relative to the support ribs 70. This serves to significantly minimize the risk of the air inlet openings 68 being undesirably closed by hand, even when a user grips the grip part 14 of the power tool 10 in its end region.
  • the air channels 66 extend from the air inlet openings 68 to the contacting means 28 of the electric motor 20, which are usually formed as carbon brushes, which are secured to a corresponding spring. Due to the special design of the air duct 66, a directed air supply to the components of the electric motor 20 is possible, which are subject to a particularly pronounced heat development due to their continuous sliding contact with the collector of the electric motor and the resulting frictional heat.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Portable Power Tools In General (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)
EP11189077.8A 2011-01-13 2011-11-15 Machine-outil électrique, notamment une machine de ponçage ou de polissage Active EP2476520B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE202011001475U DE202011001475U1 (de) 2011-01-13 2011-01-13 Elektrowerkzeugmaschine, insbesondere eine Schleif- oder Poliermaschine

Publications (3)

Publication Number Publication Date
EP2476520A2 true EP2476520A2 (fr) 2012-07-18
EP2476520A3 EP2476520A3 (fr) 2012-08-29
EP2476520B1 EP2476520B1 (fr) 2016-04-06

Family

ID=43799337

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11189077.8A Active EP2476520B1 (fr) 2011-01-13 2011-11-15 Machine-outil électrique, notamment une machine de ponçage ou de polissage

Country Status (4)

Country Link
US (1) US20120184191A1 (fr)
EP (1) EP2476520B1 (fr)
CN (1) CN102581768B (fr)
DE (1) DE202011001475U1 (fr)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
DE102014105107A1 (de) 2014-04-10 2015-10-15 Metabowerke Gmbh Schalteranordnung für eine angetriebene Handwerkzeugmaschine

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USD661563S1 (en) 2011-06-07 2012-06-12 Metabowerke Gmbh Polishing machine
US20130299207A1 (en) * 2012-05-10 2013-11-14 Black & Decker, Inc. Power tool cooling
US9475172B2 (en) 2014-07-15 2016-10-25 Milwaukee Electric Tool Corporation Adjustable guard for power tool
DE102016210853A1 (de) * 2016-06-17 2017-12-21 Robert Bosch Gmbh Handwerkzeugmaschine mit einer Kühleinheit
DE102018217155A1 (de) * 2018-10-08 2020-04-09 Robert Bosch Gmbh Handwerkzeugmaschine
USD914071S1 (en) 2018-11-02 2021-03-23 Esab Ab Welding device enclosure
US12021437B2 (en) 2019-06-12 2024-06-25 Milwaukee Electric Tool Corporation Rotary power tool
CN112366876A (zh) * 2020-11-20 2021-02-12 江苏铁锚工具股份有限公司 一种分体式交直流无刷工具

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DE102006038756A1 (de) 2006-08-17 2008-02-21 Marquardt Gmbh Elektrogerät, insbesondere in der Art eines Elektrohandwerkzeugs
DE102007000290A1 (de) 2007-05-24 2008-11-27 Hilti Aktiengesellschaft Elektrisches Handwerkzeuggerät mit Elektronikkühlung

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DE102006038756A1 (de) 2006-08-17 2008-02-21 Marquardt Gmbh Elektrogerät, insbesondere in der Art eines Elektrohandwerkzeugs
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Publication number Priority date Publication date Assignee Title
DE102014105107A1 (de) 2014-04-10 2015-10-15 Metabowerke Gmbh Schalteranordnung für eine angetriebene Handwerkzeugmaschine

Also Published As

Publication number Publication date
DE202011001475U1 (de) 2011-03-17
EP2476520B1 (fr) 2016-04-06
EP2476520A3 (fr) 2012-08-29
CN102581768A (zh) 2012-07-18
CN102581768B (zh) 2015-07-22
US20120184191A1 (en) 2012-07-19

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