EP1970162A1 - Machine-outil manuelle dotée d'un corps de refroidissement - Google Patents

Machine-outil manuelle dotée d'un corps de refroidissement Download PDF

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Publication number
EP1970162A1
EP1970162A1 EP07023723A EP07023723A EP1970162A1 EP 1970162 A1 EP1970162 A1 EP 1970162A1 EP 07023723 A EP07023723 A EP 07023723A EP 07023723 A EP07023723 A EP 07023723A EP 1970162 A1 EP1970162 A1 EP 1970162A1
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EP
European Patent Office
Prior art keywords
machine tool
tool according
cooling
hand machine
air flow
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
EP07023723A
Other languages
German (de)
English (en)
Other versions
EP1970162B1 (fr
Inventor
Paul Zimmermann
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.)
Festool GmbH
Original Assignee
Festool 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 Festool GmbH filed Critical Festool GmbH
Publication of EP1970162A1 publication Critical patent/EP1970162A1/fr
Application granted granted Critical
Publication of EP1970162B1 publication Critical patent/EP1970162B1/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
    • B25F5/008—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
    • B24B23/028—Angle tools

Definitions

  • the invention relates to a hand-held power tool having a drive train, which comprises an electric drive motor for driving a fastened to a tool holder of the hand-held power tool, with a fan for generating a cooling air flow, and with a housing having an air inlet assembly through which the cooling air flow to Cooling can flow at least one drive component of the drive train, and an air outlet assembly through which the cooling air flow can flow out of the housing.
  • a fan wheel For cooling of manual power tool machines, a fan wheel is usually arranged on the electric motor, which generates a cooling air flow.
  • the cooling air flow enters an air inlet assembly, such as slots, in the housing of the machine tool, flows past the drive train and often also its electrical components, and finally flows out of an air outlet assembly from the housing.
  • suitable cooling air ducts for example between a housing wall and the respective drive component to be cooled, an attempt is made to achieve an optimum cooling result.
  • drive components that are not sufficiently coolable in this way such as high speed bearings or the like, can cause heat transfer to the housing of the hand machine tool. The case heats up and can no longer be grasped.
  • a heat sink for dissipating heat is disposed on the at least one drive component, which protrudes freely in the cooling air flow.
  • the heat sink optimally dissipates the heat from the drive component, for example a relatively hot armature bearing of the drive motor or the like.
  • the cooling air stream absorbs the heat and conveys it out of the housing through the air outlet arrangement, so that the housing is heated relatively little, even in the region of the at least one drive component cooled in accordance with the invention.
  • the heat sink is preferably designed so that it hardly obstructs the cooling air flow and forms little resistance.
  • the cooling air flow is guided so that it also cools grip areas of the hand-held machine tool, for example by the cooling air flow being guided along an inner side of the housing in the region of the grip areas.
  • air guide means such as guide projections, air outlets and the like, may be provided for optimized guidance of the cooling air flow.
  • the hand machine tool may be, for example, a surface treatment machine such as a polishing machine, a grinding machine or the like. But even with cutting tools, such as angle grinders, or other tools with relatively fast-rotating drive components, the invention is advantageous.
  • thermoelectric cooler It can also be provided a plurality of heat sink and / or a plurality of fan wheels. Furthermore, it is conceivable that a heat sink arrangement, that is to say a plurality of heat sinks which project into the cooling air flow, are provided on the drive component to be cooled.
  • the heat sink is advantageously arranged directly on the fan.
  • the heat sink can also form an air guide for the fan.
  • the heat sink can deflect the airflow that the fan generates.
  • the fan is preferably at least partially disposed in an interior of the heat sink.
  • an upper part of the fan is arranged next to the heat sink, while a lower part is away from the heat sink.
  • the fan may also be completely surrounded by the heat sink, so that it forms a kind of fan cage. Of course, then air inlets and outlets are required on the heat sink.
  • a peripheral wall portion of the heat sink advantageously surrounds at least a part of the outer circumference of the fan wheel.
  • the fan for example, inflates the peripheral wall section.
  • the fan is advantageously arranged in the region of the air outlet arrangement.
  • the fan preferably blows at least at a portion of the cooling air flow directly through the Heilauslassan extract from the housing.
  • the other part of the cooling air flow flows past the cooling body and cools it.
  • the heat sink is advantageously arranged so that it is flowed around during operation of the machine tool on a side facing away from the fan from the cooling air flow. It is advantageous if the cooling body is also flowed around on a side facing the fan wheel of the cooling air flow, so that the cooling body is flowed around on numerous surfaces, in particular on opposite sides of the cooling air flow.
  • the heat sink advantageously has at least one air passage opening for the cooling air flow.
  • the air passage opening is e.g. arranged on an end face of the heat sink and / or preferably on a radial peripheral wall portion of the heat sink.
  • the air passage openings between cooling fingers or cooling fins are provided, which extend parallel to the outer circumference of the fan along the impeller.
  • the fan wheel is arranged, for example, below the at least one air passage opening on the radial outer circumference of the heat sink.
  • the heat sink advantageously contains or forms guiding means for the cooling air flow.
  • the heat sink forms e.g. a Nachleitapparat for the fan. It is understood that the heat sink can also be a Vorleitapparat for the fan.
  • the heat sink converts the speed of the outflowing cooling air into usable pressure.
  • the air flow increases thereby, which improves the cooling.
  • the cooling air flow can overcome greater flow resistance due to the increased pressure.
  • the reduced outflow speed reduces the flow noise.
  • the at least one drive component may include, for example, a transmission, a bearing of the drive motor or the like.
  • the bearing is, for example, a driven-side bearing of the electric motor.
  • the heat sink advantageously forms or comprises a mount for the bearing.
  • the heat sink and a support for the bearing suitably form a one-piece unit. It is also possible that a bearing part is formed on the heat sink, e.g. a bearing ring for rolling elements of a rolling or ball bearing.
  • the heat sink forms part of a transmission housing or of the drive motor.
  • the gearbox or the motor housing at the same time advantageously also form the holder for the bearing.
  • the fan is arranged for example on an output shaft of the drive motor.
  • the heat sink and the fan are positioned between the drive motor and a gearbox of the machine tool.
  • a manual power tool 10 has a power train 11 with an electric drive motor 12.
  • the power tool 10 is, for example, a polishing machine.
  • the drive motor 12 drives via a gear 13, a tool 14, for example, a polishing plate, which is held by a tool holder 15 of the hand-held machine tool 10.
  • the drive motor 12 includes a collector 16 and is rotatably mounted on bearings 17, 18.
  • the bearing 18 is a bearing for an output shaft 19, which drives the schematically illustrated gear 13.
  • a pinion 20 at the front end of the output shaft 19 meshes with a gear 21, which is rotatably mounted together with a bevel gear 23 on a shaft 22.
  • the bevel gear 23 in turn drives a bevel gear 24 on a tool spindle 25.
  • the tool holder 15 is arranged.
  • the bevel gears 23, 24 form an angular gear, while the transmission components 20, 21 reduce the speed of the drive motor 12, which rotates relatively fast.
  • the bearing 18 can heat up strongly, for example in a range of about 40 to 60 °.
  • An additional heating can be given by the bearing 18, a seal is arranged, which protects the transmission 13 from environmental influences, such as dirt particles. Such a seal generates frictional heat. Then radiating heat could in itself lead to unwanted strong heating a housing 26 of the hand-held machine tool 10, in particular in a front handle portion 27 lead. This is not the case with the manual machine tool 10.
  • An operator may grasp the handheld power tool 10 with one hand at a rear handle portion 28 where a switch 29 for turning on and off the drive motor 12 is located.
  • the operator's other hand grips the machine tool 10 in front portions of the housing 26 closer to the tool 14, preferably at the front handle portion 27, to guide the hand machine tool 10.
  • a front handle portion 59 Before the handle portion 27 is above the tool spindle 25 and the gear 13 at the top of the housing 26, a front handle portion 59. There, an operator can run the machine tool 10 and exert a compressive force on the tool 14, for example. Between the handle regions 27 and 59, the machine tool 10 can also be gripped on a handle region 60 arranged on the upper side of the housing 26.
  • the housing 26 is not undesirably heated to the handle portions 27, 28 and especially to the handle portions 59 and 60 undesirably and further drive components 30, such as the drive motor 12, the bearings 17, 18 and / or the transmission 13, are cooled, If the cooling concept according to the invention is provided:
  • a fan 31 generates a cooling air flow 32, which flows through air slots 33 of an air inlet assembly 34 of the housing 26 into the housing 26.
  • the air inlet arrangement 34 is arranged in the region of the bearing 17, so that the cooling air flow 32 directly cools it.
  • the air inlet assembly 34 is disposed between the handle portions 27, 28.
  • the cooling air stream 32 flows past the drive motor 12 from the air inlet arrangement 34.
  • the cooling air flow 32 flows through a gap 35 between the housing 26 and the drive train 11.
  • the intermediate space 35 also extends below the front handle region 27, so that it is cooled. This is indicated by arrows 36.
  • the fan 31 is driven by the drive motor 12.
  • the fan 31 is disposed between the drive motor 12 and the transmission 13 on the output shaft 19.
  • the fan 31 sucks, so to speak, the cooling air flow 32 through the air inlet assembly 34.
  • On its side facing the gear 13, the fan 31 is closed and open to the drive motor 12.
  • the cooling air flow 32 flows from the drive motor 12 ago in an interior 37 of the fan 31 and is blown through outlet openings 38 on the radially outer periphery of the fan 31 through radially outward.
  • the outlet openings 38 are e.g. provided between ribs of the fan 31.
  • a part 41 of the cooling air flow 32 flows out directly through air slots 39 of an air outlet arrangement 40 of the housing 26.
  • the air outlet assembly 40 is disposed at a lower portion of the housing 26, such as below the front end of the front handle portion 27. As a result, the blown, heated cooling air flows out of the housing 26 away from the handle regions 27, 28.
  • the cooling air flow part 42 serves to cool a heat sink 43.
  • the heat sink 43 projects freely into the cooling air flow 32.
  • the heat sink 43 essentially serves to cool the bearing 18. But also the transmission 13 can dissipate heat via the heat sink 43 in the cooling air stream 32 via the transmission housing 44.
  • the heat sink 43 forms part of a transmission housing 44 of the transmission 13.
  • the heat sink 43 is part of a transmission housing cover 45.
  • the bearing 18 is arranged in a bearing receptacle 46.
  • a counter support not shown in the drawing for the bearing 18, for example, a headband is bolted to retaining seats 47 of the gear housing 44.
  • the holding receptacles 47 are expediently tapered towards the bearing receptacle 46, so that the assembly and centering of the counter support, not shown, is simplified.
  • An end wall 48 of the heat sink 43 extends radially outward from the bearing receiver 46.
  • the fan 31 is arranged close to the bearing 18 on the output shaft 19.
  • the closed side of the fan 31 is the end wall 48 of the heat sink 43 opposite.
  • a peripheral wall portion 49 of the heat sink 43 projects in front of the end wall 48 to the fan 31.
  • the peripheral wall portion 49 surrounds a partial circumference of the fan wheel 31.
  • the end wall 48 and the peripheral wall portion 49 define an inner space 50 in which the fan 31 is at least partially disposed.
  • the heat sink 43 is disposed above the bearing receptacle 46 and thus in an upper region of the fan 31.
  • the part 42 of the cooling air flow 32 substantially cools the peripheral wall portion 49 of the heat sink 43.
  • the cooling air 32 flows out of the inner space 50 through air passage openings 51 of the heat sink 43.
  • the air passage openings 51 are provided between finger-like projections 52, in front of the Peripheral wall portion 49 project toward the fan 31 out.
  • the cooling air flow 32 flows through the air passage openings 51 radially outward through and then along a side facing away from the fan 31 31 of the heat sink 43 along.
  • the side 53 forms an outer side of the heat sink 43, so to speak.
  • the cooling air flow 32 on the one hand cools the inner side of the peripheral wall section 49 facing the fan 31 and, on the other hand, the outer side 53, so that an optimum cooling effect is achieved.
  • the cooling air flowing outside on the heat sink 43 is indicated by arrows 54 in FIG FIG. 1 indicated.
  • the cooling air flow 32 flows over the outer side 53 away to the air slots 39 of the air outlet assembly 40th
  • the geometric shape and arrangement of the heat sink 43 causes a deflection of the cooling air flow 32, so that it forms a total of air guide means for the cooling air flow 32.
  • the heat sink 43 may also be designed as a Nachleitapparat 55.
  • projections 56 may be provided which are obliquely set to the cooling air flow.
  • the projections 56 act spoiler-like and reduce the downstream speed of the cooling air flow 32.
  • the projections 56 are, for example, obliquely set radially outward.
  • the transmission housing 44 is secured to the housing 26 with brackets 57.
  • the holders 57 which are configured for example as recordings, not shown protrusions on the housing 26 before.
  • the housing 26 has, for example, two housing halves, of which the in FIG. 1 front housing half is partially cut open.
  • the housing components of the housing 26 are, for example, with fastening means 58, for example screws, connected together.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Motor Or Generator Cooling System (AREA)
EP20070023723 2007-03-15 2007-12-07 Machine-outil manuelle dotée d'un corps de refroidissement Active EP1970162B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102007012395A DE102007012395A1 (de) 2007-03-15 2007-03-15 Hand-Werkzeugmaschine mit einem Kühlkörper

Publications (2)

Publication Number Publication Date
EP1970162A1 true EP1970162A1 (fr) 2008-09-17
EP1970162B1 EP1970162B1 (fr) 2009-11-11

Family

ID=39521179

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20070023723 Active EP1970162B1 (fr) 2007-03-15 2007-12-07 Machine-outil manuelle dotée d'un corps de refroidissement

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EP (1) EP1970162B1 (fr)
DE (2) DE102007012395A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2191940A1 (fr) * 2008-11-28 2010-06-02 AEG Electric Tools GmbH Outil électrique
WO2011047959A1 (fr) * 2009-10-19 2011-04-28 Robert Bosch Gmbh Machine.outil et procédé de refroidissement d'une machine-outil
CN102729106A (zh) * 2011-03-31 2012-10-17 株式会社牧田 动力工具

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009015091B4 (de) 2009-03-31 2017-03-09 Festool Gmbh Hand-Werkzeugmaschine mit einem Antriebsstrang und einer Puffereinrichtung
DE102013000374A1 (de) * 2013-01-11 2014-07-17 Festool Group Gmbh & Co. Kg Hand-Werkzeugmaschine mit einem Lüfterrad
DE102013203806B4 (de) * 2013-03-06 2023-12-14 Robert Bosch Gmbh Handwerkzeugmaschine
DE102018217155A1 (de) * 2018-10-08 2020-04-09 Robert Bosch Gmbh Handwerkzeugmaschine
DE102019111472B3 (de) 2019-05-03 2020-06-25 Metabowerke Gmbh Elektromotor

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2335867A1 (de) 1973-07-14 1975-01-30 Metabowerke Kg Motorisch angetriebenes handwerkzeug mit schalldaemmendem gehaeuse

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29620393U1 (de) * 1996-11-25 1998-03-26 Robert Bosch Gmbh, 70469 Stuttgart Handwerkzeugmaschine
JP2005299458A (ja) * 2004-04-09 2005-10-27 T Rad Co Ltd 熱交換器冷却システム
DE102004024287A1 (de) * 2004-05-15 2005-12-01 Robert Bosch Gmbh Lagervorrichtung und Lüftungsvorrichtung

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2335867A1 (de) 1973-07-14 1975-01-30 Metabowerke Kg Motorisch angetriebenes handwerkzeug mit schalldaemmendem gehaeuse

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2191940A1 (fr) * 2008-11-28 2010-06-02 AEG Electric Tools GmbH Outil électrique
CN101745898A (zh) * 2008-11-28 2010-06-23 Aeg电动工具有限公司 电动工具
US8479840B2 (en) 2008-11-28 2013-07-09 Aeg Electric Tools Gmbh Electric tool
WO2011047959A1 (fr) * 2009-10-19 2011-04-28 Robert Bosch Gmbh Machine.outil et procédé de refroidissement d'une machine-outil
CN102596512A (zh) * 2009-10-19 2012-07-18 罗伯特·博世有限公司 工具机和用于工具机的散热的方法
CN102729106A (zh) * 2011-03-31 2012-10-17 株式会社牧田 动力工具
EP2505317A3 (fr) * 2011-03-31 2012-11-07 Makita Corporation Outil électrique

Also Published As

Publication number Publication date
EP1970162B1 (fr) 2009-11-11
DE502007001961D1 (de) 2009-12-24
DE102007012395A1 (de) 2008-09-18

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