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WO2005039822A1 - Machine-outil electrique - Google Patents

Machine-outil electrique Download PDF

Info

Publication number
WO2005039822A1
WO2005039822A1 PCT/DE2004/002129 DE2004002129W WO2005039822A1 WO 2005039822 A1 WO2005039822 A1 WO 2005039822A1 DE 2004002129 W DE2004002129 W DE 2004002129W WO 2005039822 A1 WO2005039822 A1 WO 2005039822A1
Authority
WO
WIPO (PCT)
Prior art keywords
housing
cooling
power tool
tool according
air
Prior art date
Application number
PCT/DE2004/002129
Other languages
German (de)
English (en)
Inventor
Peter Stierle
Juergen Wiker
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 EP04786845A priority Critical patent/EP1677946B1/fr
Priority to CN2004800300621A priority patent/CN1867421B/zh
Priority to US10/550,047 priority patent/US7597157B2/en
Priority to DE502004011078T priority patent/DE502004011078D1/de
Publication of WO2005039822A1 publication Critical patent/WO2005039822A1/fr

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
    • B25F5/008—Cooling means

Definitions

  • the invention relates to an electric machine tool according to the preamble of claim 1.
  • the cooling air required to cool the electric motor is usually sucked in through side air inlet openings, which are located in the rear part of the housing. It is also known to additionally provide air inlet openings on a rear end face of the housing. With conventional air routing, the cooling air is drawn into the interior of the housing by a fan located on the armature shaft. On the way from the air inlet to the air outlet, the cooling air inside the housing encounters various components that divert, swirl and slow down the air flow.
  • the housing can be used as a handle, but there is a risk that the side air intake openings can be used by the user. cover and suck in air only through the front air inlet openings. However, these are relatively small in relation to the side openings, so that only a little air can get into the housing. However, the side air inlet openings cannot be extended or enlarged arbitrarily, as otherwise the necessary distances to live parts inside the housing cannot be maintained.
  • the invention relates to an electric machine tool with an electric motor arranged in a housing and a cooling device.
  • the cooling device has, at least in some areas, a cooling channel that is essentially closed with respect to an interior of the housing.
  • the cooling medium preferably cooling air
  • the cooling medium can be directed past disruptive components. A high flow rate and a high volume throughput can be achieved. Any dirt drawn into the cooling air can be guided past sensitive parts, such as brushes or switches, and dirt can be prevented from being deposited thereon.
  • sensitive parts such as brushes or switches
  • dirt can be prevented from being deposited thereon.
  • An essentially closed cooling duct should in particular also be understood to mean cooling ducts which are nisch at least largely negligible recesses, such as slots, small holes, etc.
  • cooling duct is embedded in a support plate of a motor housing, this can be provided inexpensively during the manufacture of the support plate and can be introduced into the support plate in a space-saving and optimized manner.
  • cooling duct is covered with a cover plate, a closed cooling duct can be provided in which the
  • Coolant can flow undisturbed by components inside the housing.
  • the cooling duct can be easily cleaned if necessary by removing the cover plate.
  • cover plate is made in one piece with a motor housing, there is no need for a separate cover plate.
  • the production is particularly simple, and in the case of a motor housing produced by means of injection molding, the cover plate can simply be molded on.
  • cooling duct opens into an intake socket protruding from the housing, it is practically impossible that it will be accidentally covered when working with the power tool.
  • cooling air gets directly into the cooling duct and can be led directly to where it is needed.
  • the cross section of the cooling channel is variable and is provided by the person skilled in the art in accordance with the requirements of the individual power tool. In principle, however, it is also conceivable that the cooling duct or an intake manifold ends flush with the housing, in particular in areas outside of a grip area, whereby dirt deposits can advantageously be avoided.
  • the cooling duct can be supplied with cooling air without hindrance, even if the housing serves as a handle.
  • the cooling duct If the cooling duct is guided essentially in a straight line, the cooling air reaches the electric motor unhindered, without being hindered by components that stand in the way of the flow. There are fewer vortices in the flow path, so that any entrained dirt can deposit less and a high speed of the cooling medium can be maintained. Smaller inlet openings can be provided in order to be able to provide a required quantity of cooling medium.
  • the coolant supply can be better distributed.
  • the number of cooling channels is variable and is selected by the person skilled in the art in accordance with the requirements of the individual power tool. In principle, however, it is also conceivable that only one cooling channel is provided.
  • components can also be cooled inside the housing without affecting the cooling of the electric motor.
  • Angle grinder designed, which is inherently light
  • the drive can be overloaded, which requires particularly reliable cooling.
  • FIG. 1 shows a preferred angle grinder
  • FIG. 2 shows details of a housing according to the prior art
  • FIG. 3 shows details of an air duct according to the prior art
  • FIG. 4 shows a view of a carrier plate with cooling channels according to the invention
  • FIG. 5 shows the cooling channels from FIG. 4 with cover plate
  • FIG. 6 shows the arrangement from FIG. 5 with the switch installed
  • FIG. 7 shows a section of a completely assembled housing with intake manifold. Description of the embodiment
  • FIG. 1 shows an electric machine tool in the form of a preferred angle grinder with an electric motor arranged in a housing 10 and a cooling device in which an intake connector 20 is arranged on the rear end face of the housing 10.
  • the angle grinder can additionally have a handle that protrudes at an angle from the housing 10.
  • the housing 10 itself is also used as a handle.
  • the electric motor preferably drives an insert tool 12 which can be driven in rotation, such as a grinding wheel.
  • Fig. 2 and Fig. 3 illustrate a cooling air guide according to the prior art. Identical parts are generally numbered with the same reference symbols in the figures.
  • the housing 10 is cut open in order to clarify the conditions inside the housing 10. Air sucked in by a fan (not shown) flows through side and front air inlet openings 18, 16 into the housing 10. The side air inlet openings 18 can be provided on both sides of the housing 10. After entering the housing 10, the cooling air encounters components, such as switches 22 and electronics 24, which in themselves require little or no cooling. When these components 22, 24 flow past, vortices are created which brake the cooling air and ensure that dirt that is carried along is deposited there.
  • the thick arrows in the figures FIGS.
  • FIGS. 4 to 7 The arrangement according to the invention is shown in the following FIGS. 4 to 7.
  • a carrier plate 28 of the motor housing 26 two cooling channels 30 are let in, which lead essentially in a straight line from two intake ports 20 arranged in an end face 14 of the housing 10 to the motor housing 26 (FIG. 4).
  • the intake manifold 20 protrude from the housing 10.
  • the cooling channels 30 are covered with a cover plate 32 (FIG. 5), so that airtight cooling channels 30 are formed.
  • the cover plate 32 can be detachably or firmly connected to the edges of the cooling channels 30, for example glued, screwed or clamped onto the cooling channels 30.
  • the cover plate 32 can be formed from a single piece for all the cooling channels 30, or a separate cover plate 32 can be provided for each cooling channel 30.
  • FIG. 6 shows a switch 22 which is mounted in the housing on the cooling channels 30 or the cover plate 32.
  • the cooling air in the cooling channels 30 reaches the motor housing 26 without being influenced by the switch 22.
  • FIG. 7 shows a completely assembled housing 10 with additional front and side air inlet openings 16,
  • the intake manifold 20 for the closed cooling channels 30 in the interior of the housing 10 are arranged between a cable connection 34 and the air inlet openings 16 in the end face 14 of the housing 10.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Motor Or Generator Cooling System (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Sawing (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)

Abstract

L'invention concerne une machine-outil électrique comportant un moteur électrique logé dans un boîtier (10), et un dispositif de refroidissement (16, 18, 20, 30, 32). Selon l'invention, le dispositif de refroidissement (16, 18, 20, 30, 32) comporte, au moins dans certaines parties, un canal de refroidissement (30) fermé par rapport à l'intérieur du boîtier (10).
PCT/DE2004/002129 2003-10-15 2004-09-24 Machine-outil electrique WO2005039822A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP04786845A EP1677946B1 (fr) 2003-10-15 2004-09-24 Machine-outil electrique
CN2004800300621A CN1867421B (zh) 2003-10-15 2004-09-24 电动工具机
US10/550,047 US7597157B2 (en) 2004-09-24 2004-09-24 Electric power tool having cooling conduits
DE502004011078T DE502004011078D1 (de) 2003-10-15 2004-09-24 Elektrowerkzeugmaschine

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10347943.0A DE10347943B4 (de) 2003-10-15 2003-10-15 Elektrowerkzeugmaschine
DE10347943.0 2003-10-15

Publications (1)

Publication Number Publication Date
WO2005039822A1 true WO2005039822A1 (fr) 2005-05-06

Family

ID=34441965

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2004/002129 WO2005039822A1 (fr) 2003-10-15 2004-09-24 Machine-outil electrique

Country Status (4)

Country Link
EP (1) EP1677946B1 (fr)
CN (1) CN1867421B (fr)
DE (2) DE10347943B4 (fr)
WO (1) WO2005039822A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3960384A1 (fr) * 2020-08-28 2022-03-02 Black & Decker Inc. Configuration d'admission d'air dans un outil électrique

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008001250A1 (de) * 2008-04-18 2009-10-22 Robert Bosch Gmbh Handwerkzeugmaschine
JP5468459B2 (ja) * 2010-05-07 2014-04-09 株式会社マキタ グラインダ
DE202011001475U1 (de) * 2011-01-13 2011-03-17 Metabowerke Gmbh Elektrowerkzeugmaschine, insbesondere eine Schleif- oder Poliermaschine
US9577493B2 (en) * 2012-09-20 2017-02-21 Black & Decker Inc. Motor and electronics cooling system for a high power cordless nailer
DE102016210853A1 (de) 2016-06-17 2017-12-21 Robert Bosch Gmbh Handwerkzeugmaschine mit einer Kühleinheit
US11139722B2 (en) 2018-03-02 2021-10-05 Black & Decker Inc. Motor having an external heat sink for a power tool
DE102021206669A1 (de) 2021-06-28 2022-12-29 Robert Bosch Gesellschaft mit beschränkter Haftung Handwerkzeugmaschine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB789189A (en) * 1954-10-30 1958-01-15 Duss Friedrich Improvements in or relating to portable electric tools
US5099160A (en) * 1988-07-16 1992-03-24 Robert Bosch Gmbh Powered hand tool having an enclosed-ventilated drive motor
CH692488A5 (de) * 1996-02-06 2002-07-15 Bosch Gmbh Robert Handwerkzeugmaschine mit Vorsatzgerät.
US6543549B1 (en) * 1999-05-28 2003-04-08 Hilti Aktiengesellschaft Electrically driven hand-held tool

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1012563B (zh) * 1985-05-02 1991-05-08 神钢电机株式会社 磨削机

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB789189A (en) * 1954-10-30 1958-01-15 Duss Friedrich Improvements in or relating to portable electric tools
US5099160A (en) * 1988-07-16 1992-03-24 Robert Bosch Gmbh Powered hand tool having an enclosed-ventilated drive motor
CH692488A5 (de) * 1996-02-06 2002-07-15 Bosch Gmbh Robert Handwerkzeugmaschine mit Vorsatzgerät.
US6543549B1 (en) * 1999-05-28 2003-04-08 Hilti Aktiengesellschaft Electrically driven hand-held tool

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3960384A1 (fr) * 2020-08-28 2022-03-02 Black & Decker Inc. Configuration d'admission d'air dans un outil électrique
US11806857B2 (en) 2020-08-28 2023-11-07 Black & Decker, Inc. Airflow intake configuration in power tool

Also Published As

Publication number Publication date
CN1867421A (zh) 2006-11-22
DE502004011078D1 (de) 2010-06-02
DE10347943B4 (de) 2018-08-23
CN1867421B (zh) 2010-12-08
EP1677946A1 (fr) 2006-07-12
DE10347943A1 (de) 2005-05-19
EP1677946B1 (fr) 2010-04-21

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