EP1666213B1 - Outil électrique - Google Patents

Outil électrique Download PDF

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Publication number
EP1666213B1
EP1666213B1 EP05110263A EP05110263A EP1666213B1 EP 1666213 B1 EP1666213 B1 EP 1666213B1 EP 05110263 A EP05110263 A EP 05110263A EP 05110263 A EP05110263 A EP 05110263A EP 1666213 B1 EP1666213 B1 EP 1666213B1
Authority
EP
European Patent Office
Prior art keywords
cooling
air duct
cooling air
power tool
section
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.)
Active
Application number
EP05110263A
Other languages
German (de)
English (en)
Other versions
EP1666213A1 (fr
Inventor
Stefan Hammerstingl
Bernd Runau
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.)
Hilti AG
Original Assignee
Hilti AG
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 Hilti AG filed Critical Hilti AG
Publication of EP1666213A1 publication Critical patent/EP1666213A1/fr
Application granted granted Critical
Publication of EP1666213B1 publication Critical patent/EP1666213B1/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
    • B25D—PERCUSSIVE TOOLS
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D17/20—Devices for cleaning or cooling tool or work
    • 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
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2211/00—Details of portable percussive tools with electromotor or other motor drive
    • B25D2211/003—Crossed drill and motor spindles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2211/00—Details of portable percussive tools with electromotor or other motor drive
    • B25D2211/06—Means for driving the impulse member
    • B25D2211/068—Crank-actuated impulse-driving mechanisms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2217/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D2217/0057—Details related to cleaning or cooling the tool or workpiece
    • B25D2217/0061—Details related to cleaning or cooling the tool or workpiece related to cooling

Definitions

  • the invention relates to a power tool, in particular chisel, drill or Combihammer, referred to in the preamble of claim 1.
  • a power tool in particular chisel, drill or Combihammer, referred to in the preamble of claim 1.
  • a power tool is, for example, from DE 196 26 254 A1 known.
  • the area of the power tool also serves to guide or hold the same.
  • the metal impact mechanism housing is insulated by means of an additional housing shell made of plastic.
  • a disadvantage of the known solution is that the additional housing shell is only sufficiently robust for operation on a construction site and often constructively makes special demands. In addition, additional manufacturing costs.
  • a power tool which has an outer housing in which a drive motor and a percussion mechanism for a rotating and / or beating drive of a arranged in a tool holder of the power tool device processing tool is provided.
  • the striking mechanism is connected to the drive motor via a gearbox.
  • a fan element driven in the outer housing for example directly from the drive motor, a cooling air flow is generated for cooling the heat-generating components of the power tool device.
  • the housing of the percussion mechanism is arranged at a distance to form a cooling air passage extending parallel to a longitudinal extent of the percussion mechanism.
  • the cooling air flow in the outer housing flows around the possibly present electronics, the drive motor, the gear and is passed through the cooling air duct for tool holder on percussion over and blown through exhaust ports on the tool holder.
  • a disadvantage of the known solution is that the impact mechanism is at the end of the cold chain and the cooling air has already been heated by the other heat-generating components of the power tool. If the temperature of the cooling air flow is already at a high level after the cooling of the other heat-generating constituents, the impact mechanism is barely cooled by means of the already heated cooling air conducted through the cooling air duct or, in the extreme case, even heated by it. The lifetime of the striking mechanism is reduced because critical lubrication and sealing areas are thermally overloaded.
  • the object of the invention is to provide a power tool with a striking mechanism according to the preamble of claim 1, which is easy to manufacture and with a, advantageously low energy consumption having fan element, the cooling of the entire power tool and in particular the percussion ensures.
  • the cooling air duct has a constriction of its cross section and a fresh air duct is provided, which communicates with the atmosphere on the one hand via an intake opening in the outer housing and on the other hand via a connection opening with the cooling air duct.
  • the connection opening is arranged in the region of the constriction of the cooling air channel.
  • the impact mechanism in the cold chain is at the end, due to the passive supply of fresh air and the resulting reduction in the temperature level of the cooling air flow in the impact mechanism, the life of the percussion mechanism increases because the lubrication and sealing chambers are exposed to less thermal stress. Furthermore, the contact temperature in the percussion area lowers to a tolerable level, so that no further constructive measures, such as the arrangement of additional housing shells are required to improve the ease of use of the power tool or to meet approval standards.
  • the cross-section of the cooling air channel decreases from at least one end of the cooling air channel to the constriction, at which the cross-section of the cooling air channel is most tapered towards continuously or continuously, whereby the flow losses within the cooling air channel are kept small despite the narrowing of the cross section.
  • the constriction of the cross section of the cooling air channel steadily decreases from the cooling air flow upstream end of the cooling air channel to and after the junction of the connection opening in the cooling air channel to the other, cooling air flow downstream end of the cooling air channel.
  • the surfaces of the corresponding channel sections have a low wall roughness in order to minimize undesired pressure losses.
  • an insert element for creating the constriction of the cross section of the cooling air passage in the cooling air passage is provided.
  • the impact mechanism is arranged at least partially with a distance from the outer housing.
  • the insert element is z. B. prior to assembly of the outer housing in the area, which forms the at least one cooling air channel aligned in the merged state of the power tool device.
  • the housing of the striking mechanism is formed from an extruded profile, in which at least one cooling air channel is formed. For example, by means of appropriate reworking the required constriction of the cross section of the cooling air duct is created at the desired location in the same.
  • connection opening is smaller than the suction opening, so that the passive suction of ambient air through the fresh air channel is supported by the cooling air flowing in the cooling air passage.
  • the cross section of the connection opening is advantageously designed to be substantially smaller than the cross section in the region of the constriction of the cooling air channel.
  • an advantageous intake behavior is achieved if the connection opening at the junction is sharp-edged, but burr-free.
  • these can also be arranged obliquely, at an angle between 0 ° and 90 ° to the outside of the outer housing.
  • the connection opening does not necessarily have to be aligned perpendicular to the longitudinal extent of the cooling air duct. To minimize the Flow losses are deflections advantageous round running or angled by sloping formed.
  • the fresh air duct preferably has a section extending substantially parallel to the cooling air duct, with which removal material or accumulating dust during operation can not penetrate directly into the cooling air duct.
  • a section extending substantially parallel to the cooling air channel can be easily manufactured.
  • each cooling air channel is assigned at least one fresh air channel, so that a sufficient amount of cool ambient air can be supplied and thus sufficient cooling of the percussion mechanism is ensured.
  • a sufficient cooling is ensured when z. B. individual suction through manual closure or by decomposition material or dust are closed.
  • power tool 11 is a chisel hammer with an outer housing 12, in which a drive motor 13 and a percussion mechanism 15 is provided, the percussion mechanism 15 is connected via a gear 14 with the drive motor 13 for a beating drive a fixable in a tool holder 16 processing tool 17 in conjunction ,
  • the housing 20 of the percussion mechanism 15 is extruded Made profile and has along the longitudinal extent of the striking mechanism 15 extending cooling air ducts 18.
  • a fan element 19 driven by the drive motor 13 is provided in the outer housing 12.
  • each cooling air channel 18 associated fresh air ducts 31 are provided which are on the one hand via a suction port 32 in the outer housing 12 with the atmosphere and on the other hand via a connection opening 33 with the cooling air duct 18 in connection.
  • Each of the fresh air ducts 31 has a section 34 extending parallel to the cooling air ducts 18.
  • the connection openings 33 each have a smaller cross-section than the suction openings 32 and are arranged at a distance from the ends of the section 34.
  • the size of the cross section of the fresh air channel 31 has a constant size and substantially corresponds to the size of the cross section of the suction opening 32.
  • the inlet opening 35 of the connection opening 33 in the cooling air channel 18 is formed sharp-edged and burr-free.
  • the deflection 36 between the intake port 32 and the fresh air passage 31 is round.
  • Each cooling air channel 18 has a constriction 21 of the cross section of the cooling air channel 18, wherein the connecting opening 33 is arranged in the region of the largest constriction 21 of the cross section.
  • the constriction 21 increases steadily from the cooling air flow upstream end 22 to the region with the greatest narrowing of the cross section of the cooling air duct 18 and then decreases from this continuously or continuously to the cooling air flow downstream end 23 from.
  • ambient air is sucked in through the air openings 27 by means of the fan element 19, the generated cooling air flow 26 for cooling the drive motor 13 and the transmission 14 flowing around same.
  • the heated cooling air is guided through the cooling air channels 18 and blown out through the blow-off openings 28. Due to the constriction 21 in the cooling air channels 18, a negative pressure relative to the barometric ambient pressure outside the power tool 11 is generated and passively sucked through the fresh air channels 31 ambient air, which mixes with the heated cooling air in the cooling air duct 18, wherein the temperature level of the previously heated cooling air is lowered.
  • the power tool device which in the FIG. 3 is only partially shown, is to form parallel to the longitudinal extension extending cooling air channels 48, the percussion 45 at a distance from the outer housing 42nd arranged.
  • an insert element 54 is provided in each cooling air channel 48 to create the constriction 51 of the cross section of the cooling air channel 48.
  • each cooling air channel 48 is associated with a fresh air duct 61 is provided, which is on the one hand via two intake ports 62 in the outer housing 42 with the atmosphere and on the other hand via a connection opening 63 with the cooling air passage 48 in connection.
  • the fresh air duct 61 has a section 64 extending at an angle ⁇ to the longitudinal extension of the cooling air duct 48.
  • the connection opening 63 also has a smaller cross section than the sum of the cross sections of the suction openings 62 in this exemplary embodiment and is arranged at a distance from the ends of the section 64 in the region of the greatest constriction 51 of the cross section of the cooling air channel 48.
  • the suction openings 62 are arranged at an angle ⁇ to the outer side 55 of the outer housing 42.
  • the size of the cross section of the fresh air channel 61 corresponds essentially to the sum of the size of the cross sections of the intake openings 62.
  • the inclined arrangement of the suction openings 62 on the one hand and the fresh air channel 61 on the other hand provide a deflection 66 which is advantageous for the flow behavior between the intake openings 62 and the fresh air channel 61 ,

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)

Claims (6)

  1. Appareil électrique, en particulier burineur, marteau perforateur ou perforateur-burineur, comprenant un carter extérieur (12 ; 42) et un élément de ventilateur (19) pour produire un courant d'air de refroidissement (26) dans le carter extérieur (12 ; 42), dans le carter extérieur (12 ; 42) étant prévu un moteur d'entraînement (13) qui, par l'intermédiaire d'une transmission (14), est couplé à un mécanisme de percussion (15 ; 45), et dans le carter extérieur (12 ; 42) étant ménagé un canal d'air de refroidissement (18 ; 48) qui s'étend le long d'une extension longitudinale du mécanisme de percussion (15 ; 45), caractérisé en ce que le canal d'air de refroidissement (18 ; 48) comporte un rétrécissement (21 ; 51) de sa section transversale et en ce qu'il est prévu un canal d'air frais (31 ; 61) qui communique, d'une part, avec l'atmosphère par l'intermédiaire d'au moins une ouverture d'aspiration (32 ; 62) ménagée dans le carter extérieur (12 ; 42) et, d'autre part, avec le canal d'air de refroidissement (18 ; 48) par l'intermédiaire d'une ouverture de liaison (33 ; 63), l'ouverture de liaison (33 ; 63) étant disposée dans la zone du rétrécissement (21 ; 51) du canal d'air de refroidissement (18 ; 48).
  2. Appareil électrique selon la revendication 1,
    caractérisé en ce que la section transversale du canal d'air de refroidissement (18 ; 48) décroît constamment d'au moins une extrémité du canal d'air de refroidissement (18 ; 48) jusqu'au rétrécissement (21 ; 51).
  3. Appareil électrique selon la revendication 1 ou 2, caractérisé en ce qu'un élément rapporté (54) est prévu dans le canal d'air de refroidissement (48) pour créer le rétrécissement (51) de la section transversale du canal d'air de refroidissement (48).
  4. Appareil électrique selon une des revendications 1 à 3, caractérisé en ce que l'ouverture de liaison (33 ; 63) est plus petite que l'ouverture d'aspiration (32 ; 62).
  5. Appareil électrique selon une des revendications 1 à 4, caractérisé en ce que le canal d'air frais (31) comporte une portion (34) qui s'étend sensiblement parallèlement au canal d'air de refroidissement (18).
  6. Appareil électrique selon une des revendications 1 à 5, caractérisé en ce que plusieurs canaux d'air de refroidissement (18 ; 48) sont prévus, à chaque canal d'air de refroidissement (18 ; 48) étant associé un canal d'air frais (31 ; 61).
EP05110263A 2004-12-06 2005-11-02 Outil électrique Active EP1666213B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102004058696A DE102004058696A1 (de) 2004-12-06 2004-12-06 Elektrowerkzeuggerät

Publications (2)

Publication Number Publication Date
EP1666213A1 EP1666213A1 (fr) 2006-06-07
EP1666213B1 true EP1666213B1 (fr) 2009-08-12

Family

ID=36072133

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05110263A Active EP1666213B1 (fr) 2004-12-06 2005-11-02 Outil électrique

Country Status (3)

Country Link
US (1) US7258173B2 (fr)
EP (1) EP1666213B1 (fr)
DE (2) DE102004058696A1 (fr)

Families Citing this family (23)

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Publication number Priority date Publication date Assignee Title
NZ547208A (en) * 2003-10-28 2009-10-30 Ibex Ind Ltd Powered hand tool
DE102006000209A1 (de) * 2006-05-05 2007-11-15 Hilti Ag Handwerkzeugmaschine mit Schlagwerkzeugaufnahme
DE102006029634A1 (de) * 2006-06-28 2008-01-03 Robert Bosch Gmbh Elektrohandwerkzeugmaschine
US7413026B2 (en) * 2006-07-01 2008-08-19 Black & Decker Inc. Lubricant system for powered hammer
EP1872915A3 (fr) * 2006-07-01 2011-06-01 Black & Decker, Inc. Pompe de lubrifiant pour marteau perforateur
DE102007043916A1 (de) * 2007-09-14 2009-04-02 Robert Bosch Gmbh Elektrohandwerkzeugmaschine
CN101537611A (zh) * 2008-03-21 2009-09-23 南京德朔实业有限公司 动力工具及其工作头
DE102008032791A1 (de) * 2008-07-11 2010-01-14 Wacker Neuson Se Bohr- und/oder Schlaghammer mit Nachschmiervorrichtung
JP5416397B2 (ja) * 2008-12-19 2014-02-12 株式会社マキタ 作業工具
JP5321138B2 (ja) * 2009-02-28 2013-10-23 日立工機株式会社 集塵装置付き穿孔工具
DE102009045799A1 (de) 2009-10-19 2011-05-12 Robert Bosch Gmbh Werkzeugmaschine und Verfahren zur Kühlung einer Werkzeugmaschine
DE102010004723A1 (de) * 2010-01-15 2011-07-21 Wacker Neuson SE, 80809 Bohr- und/oder Schlaghammer mit Freikonvektions-Kühlung
DE102010004724A1 (de) * 2010-01-15 2011-07-21 Wacker Neuson SE, 80809 Bohr- und/oder Schlaghammer mit Kühlung von Gerätekomponenten
US9339925B2 (en) * 2010-07-01 2016-05-17 Stanley Fastening Systems, L.P. Fastener driving device with dust blower
DE102012201583A1 (de) * 2012-02-03 2013-08-08 Robert Bosch Gmbh Handwerkzeugmaschinenvorrichtung
US20130299207A1 (en) * 2012-05-10 2013-11-14 Black & Decker, Inc. Power tool cooling
US9718180B2 (en) 2013-05-09 2017-08-01 Black & Decker Inc. Power tool having improved motor and controller cooling
EP2857149A1 (fr) * 2013-10-03 2015-04-08 HILTI Aktiengesellschaft Machine-outil manuelle
US9475172B2 (en) 2014-07-15 2016-10-25 Milwaukee Electric Tool Corporation Adjustable guard for power tool
WO2019079560A1 (fr) 2017-10-20 2019-04-25 Milwaukee Electric Tool Corporation Outil à percussion
WO2019147919A1 (fr) 2018-01-26 2019-08-01 Milwaukee Electric Tool Corporation Outil à percussion
US20230027574A1 (en) * 2021-07-26 2023-01-26 Makita Corporation Striking tool
EP4324598A1 (fr) * 2022-08-18 2024-02-21 Hilti Aktiengesellschaft Dispositif de raccordement d'outil pour un marteau perforateur ou burineur

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US3003073A (en) * 1959-03-20 1961-10-03 Black & Decker Mfg Co Cooling means for portable electric tool
DE1179520B (de) * 1959-04-07 1964-10-08 Bosch Gmbh Robert Elektromotorisch angetriebener Hammer
US3511322A (en) * 1967-09-14 1970-05-12 Phillips Drill Co Percussive hammer with vacuum system for cleaning debris from workpiece
US4286675A (en) * 1979-06-25 1981-09-01 Beaird-Poulan Division Of Emerson Electric Co. Narrow profile power handle for line trimmer and the like
NL8801466A (nl) * 1988-06-07 1990-01-02 Emerson Electric Co Inrichting voor het aandrijven van een boor- en/of slaggereedschap.
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DE19839963A1 (de) * 1998-09-02 2000-03-09 Hilti Ag Elektrowerkzeug
JP2000153473A (ja) * 1998-11-19 2000-06-06 Makita Corp 打撃工具
DE19924552A1 (de) * 1999-05-28 2000-11-30 Hilti Ag Elektrisch betreibbares Handgerät
GB0109747D0 (en) * 2001-04-20 2001-06-13 Black & Decker Inc Hammer
ATE361182T1 (de) * 2001-10-15 2007-05-15 Hilti Ag Kühlluftleitung für ein elektrohandwerkzeuggerät mit elektropneumatischem schlagwerk
US7064462B2 (en) * 2002-02-04 2006-06-20 Milwaukee Electric Tool Corporation Power tools with switched reluctance motor
JP4075540B2 (ja) * 2002-09-10 2008-04-16 松下電工株式会社 電動工具
DE10242414A1 (de) * 2002-09-12 2004-03-25 Hilti Ag Elektrowerkzeugmaschine mit Gebläse
JP4485190B2 (ja) * 2003-12-26 2010-06-16 株式会社マキタ 電動ハンマ

Also Published As

Publication number Publication date
DE502005007883D1 (de) 2009-09-24
US20060131042A1 (en) 2006-06-22
US7258173B2 (en) 2007-08-21
DE102004058696A1 (de) 2006-06-08
EP1666213A1 (fr) 2006-06-07

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