DE10161616A1 - Hand-held machine tool esp. eccentric grinder has cooling air outlet channel opening to outside via chip suction air channel and dust box - Google Patents

Hand-held machine tool esp. eccentric grinder has cooling air outlet channel opening to outside via chip suction air channel and dust box

Info

Publication number
DE10161616A1
DE10161616A1 DE10161616A DE10161616A DE10161616A1 DE 10161616 A1 DE10161616 A1 DE 10161616A1 DE 10161616 A DE10161616 A DE 10161616A DE 10161616 A DE10161616 A DE 10161616A DE 10161616 A1 DE10161616 A1 DE 10161616A1
Authority
DE
Germany
Prior art keywords
cooling
channel
machine tool
dust box
air outlet
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.)
Withdrawn
Application number
DE10161616A
Other languages
German (de)
Inventor
Juergen Hesse
Martin Noack
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.)
Robert Bosch GmbH
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 DE10161616A priority Critical patent/DE10161616A1/en
Priority to PCT/DE2002/003695 priority patent/WO2003051574A1/en
Publication of DE10161616A1 publication Critical patent/DE10161616A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
    • B23Q11/12—Arrangements for cooling or lubricating parts of the machine
    • B23Q11/126—Arrangements for cooling or lubricating parts of the machine for cooling only
    • B23Q11/127—Arrangements for cooling or lubricating parts of the machine for cooling only for cooling motors or spindles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
    • B23Q11/0042—Devices for removing chips
    • B23Q11/0046—Devices for removing chips by sucking
    • 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
    • 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
    • B24B55/06—Dust extraction equipment on grinding or polishing machines
    • B24B55/10—Dust extraction equipment on grinding or polishing machines specially designed for portable grinding machines, e.g. hand-guided
    • B24B55/102—Dust extraction equipment on grinding or polishing machines specially designed for portable grinding machines, e.g. hand-guided with rotating 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans
    • H02K7/145—Hand-held machine tool
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine
    • H02K9/04—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium
    • H02K9/06—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium with fans or impellers driven by the machine shaft

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Abstract

The machine tool (10) has a housing (12), containing a motor (20) with air cooling and cooling air outlet channels (44), and a chip suction channel (40). The cooling air channel opens indirectly to the outside via the chip suction airflow. The two channels are connected via a connection channel (46). The air outlet channel increases in size snail-like in direction of outlet, an opens into the suction channel with its larger section.

Description

Stand der TechnikState of the art

Die vorliegende Erfindung betrifft eine Handwerkzeugmaschine mit Motorluftkühlung und Spanabsaugung nach dem Oberbegriff des Anspruchs 1. The present invention relates to a hand machine tool with engine air cooling and chip extraction according to the generic term of claim 1.

Durch die US 4,209,069 ist eine Handwerkzeugmaschine mit Motorluftkühlung bekannt, deren Kühlluft durch die Staubbox hindurch angesaugt wird. Zwischen der Staubbox und dem Kühlventilator ist ein Staubfilter angeordnet, damit kein Staub ins Motorinnere gelangt. Außerdem führt ein äußeres Spanabsaugrohr vom Werkzeug der Handwerkzeugmaschine zur Staubbox. Durch dieses werden Späne vom Ort des Werkzeugeingriffs in ein Werkstück zur Staubbox transportiert. US 4,209,069 includes a handheld power tool Engine air cooling known, the cooling air through the dust box is sucked through. Between the dust box and the Cooling fan is arranged a dust filter, so no dust got inside the engine. In addition, an exterior leads Chip extraction pipe from the tool of the hand tool to the dust box. This removes chips from the location of the tool intervention in a workpiece is transported to the dust box.

Eine weitere Handwerkzeugmaschine ist durch die EP 579 964 bekannt, die eine dem Kühllüfter vorgeschaltete Spanbox trägt. Another handheld power tool is EP 579 964 known, the Spanbox upstream of the cooling fan wearing.

Bei beiden Handwerkzeugmaschine besteht der Nachteil, daß der Kühlluftstrom durch den hohen Widerstand des dem Kühlventilator vorgelagerten Staubfilters beeinträchtigt ist. Auf Staubfilter kann jedoch nicht verzichtet werden, da mit der Kühlluft in den Motor eintretender Staub die Motorfunktion beeinträchtigt. The disadvantage of both handheld power tools is that the cooling air flow through the high resistance of the Cooling fan upstream dust filter is impaired. However, there is no need for a dust filter, because with the cooling air dust entering the engine Motor function impaired.

Darüber hinaus verursacht die aus dem Motorgehäuse ausgeblasene, erwärmte Kühlluft eine erhebliche, gesundheitsbeeinträchtigende Staubverwirbelung im Spanabtragsbereich des Werkzeugs. It also caused out of the motor housing blown out, heated cooling air a considerable, dust swirling in the chip removal area of the Tool.

Vorteile der ErfindungAdvantages of the invention

Die vorliegende Erfindung mit den Merkmalen des Anspruchs 1 hat den Vorteil, dass die Kühlabluft nicht mehr unmittelbar aus dem Gehäuse ins Freie austreten kann, sondern daß dort Staubverwirbelung vermieden wird und die Kühl-Abluft das Gehäuse strömungsoptimiert über die Staubbox verlassen muß, so daß die in die Atemluft in der Umgebung der Handwerkzeugmaschine gelangende Staubmenge verringert wird. The present invention with the features of claim 1 has the advantage that the cooling exhaust air is no longer immediate can escape from the housing into the open, but that there Swirling of dust is avoided and the cooling exhaust air Must leave the housing in a flow-optimized manner via the dust box, so that in the breathing air around the Handheld power tool dust quantity is reduced.

Außerdem wird dadurch die Spanabsaugung im Bereich des Werkzeugeingriffs durch die Injektorwirkung des in die Staubbox geleiteten Kühlabluftstromes verbessert. In addition, the chip extraction in the area of Tool intervention due to the injector effect in the dust box conducted cooling exhaust air flow improved.

Dadurch, dass der Kühlabluftstrom das Gehäuse durch einen zyklonartig geführten Ringabluftkanal tangential verlassen muß, wird der Strömungswiderstand des Kühlabluftstromes verringert und ein Schalldämpfereffekt erreicht. Dadurch werden insbesondere die hohe Schwingungsfrequenzen der Kühlabluft unterdrückt. The fact that the cooling exhaust air flow through a housing Leave the cyclone-type duct exhaust tangentially must, the flow resistance of the cooling exhaust air flow reduced and a silencer effect achieved. This will in particular the high vibration frequencies of the cooling exhaust air suppressed.

Zeichnungdrawing

Nachstehend ist die Erfindung anhand eines Ausführungsbeispiels mit zugehöriger Zeichnung näher erläutert. Diese zeigt einen Längsschnitt eines erfindungsgemäßen Exzenterschleifers. The invention is based on a Embodiment with associated drawing explained in more detail. This shows a longitudinal section of an inventive Orbital sander.

Ausführungsbeispielembodiment

Die Zeichnung zeigt eine als Exzenterschleifer ausgestaltete Handwerkzeugmaschine 10 mit einem Gehäuse 12, das in Betrachtungsrichtung nach links einen waagerechten Handgriff 14 aufweist, der eine handbetätigbare Schalttaste 16 eines nicht dargestellten Schalters zum Starten und Stoppen des Motors 20 trägt. The drawing shows a handheld power tool 10 designed as an eccentric grinder with a housing 12 which, in the viewing direction to the left, has a horizontal handle 14 which carries a manually operable switch button 16 of a switch (not shown) for starting and stopping the motor 20 .

Am hinteren Ende des Handgriffs 14 tritt ein Elektrokabel 18 aus, das zur Energieversorgung des Motors 20 dient. At the rear end of the handle 14 , an electrical cable 18 emerges, which is used to supply energy to the motor 20 .

Das Gehäuse 12 trägt den Motor 20 mit einer senkrecht zum Handgriff 14 verlaufenden Motorachse 19, in deren Verlängerung nach unten aus dem Motor 20 eine Motorwelle 22 ragt. Deren Ende wird drehfest von einem Kühl-Ventilator 26 umgriffen, der Luft radial nach außen in Richtung des Kühlabluftpfeiles 48 fördert. Dadurch wird im oberen Bereich des Gehäuses 12 an Kühlschlitzen 23 des Gehäuses 12 kühlende Außenluft angesaugt, die gemäß Kühleinströmpfeil 24 in das Gehäuse 12 ein- und am Motor 20 vorbeiströmen kann und anschließend durch einen Verbindungskanal 46 das Gehäuse 12 durch dessen Absaugstutzen 42 verlassen kann. The housing 12 supports the motor 20 with a motor axis 19 running perpendicular to the handle 14 , in the extension of which a motor shaft 22 projects downward from the motor 20 . The end of which is rotatably gripped by a cooling fan 26 which conveys air radially outward in the direction of the cooling exhaust air arrow 48 . As a result, cooling external air is sucked into cooling slots 23 of the housing 12 in the upper region of the housing 12 , which air can flow into the housing 12 according to the cooling inflow arrow 24 and flow past the motor 20 and can then leave the housing 12 through a connection duct 46 through its suction nozzle 42 .

Dadurch, daß sich der Verbindungskanal 46 insbesondere im Bereich seiner Mündung 47 in den Absaugstutzen 42 radial erweitert, fließt die Kühlabluft entlang dem Richtungspfeil 48 und erzeugt im Staubabsaugkanal 40 - wie mit einer Injektorpumpe - einen zusätzlichen Unterdruck. Damit wird der Spanabtransport von den Staubabsauglöchern 38 des Schleiftellers 34 zur Staubbox 50 hin verstärkt. Characterized in that the connecting channel 46 in particular in the region of its mouth 47 into the exhaust pipe 42 expands radially, the cooling air flows along the direction of arrow 48 and generated in Staubabsaugkanal 40 - as with an injector pump - an additional negative pressure. The chip removal from the dust extraction holes 38 of the grinding plate 34 to the dust box 50 is thus increased.

Axial nach unten hin ist das den Kühlventilator 26 umgebende Gehäuse 12 abgedichtet und wird vom unteren Ende der Motorwelle 22 durchtreten. Diese ist dort in einem Wälzlager 28 drehbar gelagert. The housing 12 surrounding the cooling fan 26 is sealed axially downward and is penetrated by the lower end of the motor shaft 22 . This is rotatably supported there in a roller bearing 28 .

Im glockenartigen, vom Kühlventilator 26 abgewandten Bereich trägt das freie Ende der Motorwelle 22 einen Staubventilator 30, der an den Staubabsauglöchern 38 des Schleiftellers 34 Luft bzw. Späne einsaugt und diese zum Absaugstutzen 42 hinausbläst. In the bell-like area facing away from the cooling fan 26 , the free end of the motor shaft 22 carries a dust fan 30 , which sucks in air or chips at the dust suction holes 38 of the grinding plate 34 and blows them out to the suction nozzle 42 .

Eine am unteren Rand des Gehäuses 12 sitzende, ringförmige Dichtlippe 52 stützt sich federelastisch vorgespannt in axialer Richtung oben am Schleifteller 34 ab. Damit ist der Raum zwischen dem Gehäuse 12 und dem Schleifteller 34 gegen störende Falschluft abgedichtet und der Spanabtransport mit hohem Wirkungsgrad gesichert. An annular sealing lip 52 seated at the lower edge of the housing 12 is resiliently prestressed in the axial direction at the top of the grinding plate 34 . The space between the housing 12 and the grinding plate 34 is thus sealed against disturbing false air and the chip removal is ensured with high efficiency.

Der Staubventilator 30 weist nach unten zum Schleifteller 34 hin eine nicht näher bezeichnete exzentrische Öffnung auf, die als Lagersitz für ein Kugellager 31 dient. Dieses exzentrisch sitzende Kugellager 31 trägt einen Exzenterzapfen 32, der über einer Schraube 36 drehfest mit dem Schleifteller 34 verbindbar ist. The dust fan 30 has an eccentric opening, which is not designated in more detail, towards the grinding plate 34 and serves as a bearing seat for a ball bearing 31 . This eccentrically seated ball bearing 31 carries an eccentric pin 32 which can be connected in a rotationally fixed manner to the grinding plate 34 by means of a screw 36 .

Dreht sich die Motorwelle 22, so folgt der Exzenter 32 wegen der Lagerreibung des Kugellagers 31 dieser Drehung, indem er um seine Exzenterachse 33 rotiert und gleichzeitig um die Motorachse 19 beziehungsweise die Motorwelle 22 kreist. Dies führt zur charakteristischen orbitalen, bei Exzenterschleifern üblichen Schwingbewegung des Schleiftellers 34. If the motor shaft 22 rotates, the eccentric 32 follows this rotation because of the bearing friction of the ball bearing 31 by rotating about its eccentric axis 33 and simultaneously rotating around the motor axis 19 or the motor shaft 22 . This leads to the characteristic orbital oscillating movement of the grinding plate 34 , which is common in eccentric grinders.

Claims (3)

1. Handwerkzeugmaschine (10) mit einem Gehäuse (12), das einen Motor (20) mit Luftkühlung und Kühlabluftkanal (44, 46) sowie einen einen Spanabsaugluftstrom führenden Spanabsaugkanal (40) aufweist, dadurch gekennzeichnet, daß der Kühlabluftkanal (44, 46) mittelbar nach außen mündet, indem er mit dem Spanabsaugluftstrom zusammengeführt ist. 1. Hand tool ( 10 ) with a housing ( 12 ) which has a motor ( 20 ) with air cooling and cooling exhaust air duct ( 44 , 46 ) and a chip extraction duct ( 40 ) leading a chip extraction air flow, characterized in that the cooling exhaust air duct ( 44 , 46 ) indirectly flows outwards by being brought together with the chip suction air flow. 2. Handwerkzeugmaschine nach Anspruch 1, dadurch gekennzeichnet, daß der Kühlabluftkanal (44, 46) über einen Verbindungskanal (46) mit dem Absaugkanal (40, 42) zusammengeführt ist. 2. Hand tool according to claim 1, characterized in that the cooling exhaust air duct ( 44 , 46 ) via a connecting channel ( 46 ) with the suction channel ( 40 , 42 ) is brought together. 3. Handwerkzeugmaschine nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Kühlabluftkanal (44) schneckenartig in Ausströmrichtung vergrößert ist und an seinem größten Querschnitt in den Absaugkanal (40, 42) mündet. 3. Hand tool according to claim 1 or 2, characterized in that the cooling exhaust duct ( 44 ) is auger-like in the outflow direction and opens at its largest cross section in the suction channel ( 40 , 42 ).
DE10161616A 2001-12-14 2001-12-14 Hand-held machine tool esp. eccentric grinder has cooling air outlet channel opening to outside via chip suction air channel and dust box Withdrawn DE10161616A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE10161616A DE10161616A1 (en) 2001-12-14 2001-12-14 Hand-held machine tool esp. eccentric grinder has cooling air outlet channel opening to outside via chip suction air channel and dust box
PCT/DE2002/003695 WO2003051574A1 (en) 2001-12-14 2002-09-27 Hand tool comprising motor air cooling and chip removal by suction

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE10161616A DE10161616A1 (en) 2001-12-14 2001-12-14 Hand-held machine tool esp. eccentric grinder has cooling air outlet channel opening to outside via chip suction air channel and dust box

Publications (1)

Publication Number Publication Date
DE10161616A1 true DE10161616A1 (en) 2003-06-26

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Family Applications (1)

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DE10161616A Withdrawn DE10161616A1 (en) 2001-12-14 2001-12-14 Hand-held machine tool esp. eccentric grinder has cooling air outlet channel opening to outside via chip suction air channel and dust box

Country Status (2)

Country Link
DE (1) DE10161616A1 (en)
WO (1) WO2003051574A1 (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10329828A1 (en) * 2003-06-27 2005-01-20 Festool Gmbh Hand tool
EP1728591A2 (en) * 2005-05-13 2006-12-06 Black & Decker, Inc. Angle grinder
DE102007057531A1 (en) * 2007-11-29 2009-06-04 Mafell Ag power tool
DE102016123179A1 (en) * 2016-11-30 2018-05-30 Metabowerke Gmbh Machine tool with dust collecting device
CN110883696A (en) * 2019-12-10 2020-03-17 西安奕斯伟硅片技术有限公司 Water cooling system for upper polishing disc
US10818450B2 (en) 2017-06-14 2020-10-27 Black & Decker Inc. Paddle switch
DE102009054811B4 (en) * 2009-12-17 2021-06-17 Robert Bosch Gmbh Hand machine tool
EP4368338A1 (en) * 2022-11-10 2024-05-15 X'Pole Precision Tools Inc. Electric tool grinding machine and casing thereof

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JP2012061575A (en) * 2010-09-17 2012-03-29 Makita Corp Dust-collecting mechanism of electric tool
JP2012149635A (en) * 2010-12-27 2012-08-09 Hitachi Koki Co Ltd Engine working machine
US10369672B2 (en) 2012-10-19 2019-08-06 Husqvarna Ab Outdoor power device internal cooling system
FI127766B (en) * 2017-09-01 2019-02-15 Mirka Ltd An abrading apparatus comprising a spindle bearing cooling arrangement and a method for cooling a spindle bearing of an abrading apparatus
DE102020215737A1 (en) * 2020-12-11 2022-06-15 Flex-Elektrowerkzeuge Gmbh machine tool

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Publication number Priority date Publication date Assignee Title
DE10329828B4 (en) * 2003-06-27 2009-06-18 Festool Gmbh Hand tool with cooling device and dust extraction
DE10329828A1 (en) * 2003-06-27 2005-01-20 Festool Gmbh Hand tool
US8087977B2 (en) 2005-05-13 2012-01-03 Black & Decker Inc. Angle grinder
CN102069442B (en) * 2005-05-13 2014-05-07 布莱克和戴克公司 Angle grinder
EP1728591A3 (en) * 2005-05-13 2007-02-14 Black & Decker, Inc. Angle grinder
EP2095907A1 (en) * 2005-05-13 2009-09-02 BLACK & DECKER INC. Angle grinder
US7722444B2 (en) 2005-05-13 2010-05-25 Black & Decker Inc. Angle grinder
US8087976B2 (en) 2005-05-13 2012-01-03 Black & Decker Inc. Trigger assembly for angle grinder
EP1728591A2 (en) * 2005-05-13 2006-12-06 Black & Decker, Inc. Angle grinder
DE102007057531A1 (en) * 2007-11-29 2009-06-04 Mafell Ag power tool
DE102009054811B4 (en) * 2009-12-17 2021-06-17 Robert Bosch Gmbh Hand machine tool
DE102016123179A1 (en) * 2016-11-30 2018-05-30 Metabowerke Gmbh Machine tool with dust collecting device
US10818450B2 (en) 2017-06-14 2020-10-27 Black & Decker Inc. Paddle switch
CN110883696A (en) * 2019-12-10 2020-03-17 西安奕斯伟硅片技术有限公司 Water cooling system for upper polishing disc
CN110883696B (en) * 2019-12-10 2021-10-01 西安奕斯伟硅片技术有限公司 Water cooling system for upper polishing disc
EP4368338A1 (en) * 2022-11-10 2024-05-15 X'Pole Precision Tools Inc. Electric tool grinding machine and casing thereof

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