EP2025476B1 - Outil électrique manuel - Google Patents

Outil électrique manuel Download PDF

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Publication number
EP2025476B1
EP2025476B1 EP08104549A EP08104549A EP2025476B1 EP 2025476 B1 EP2025476 B1 EP 2025476B1 EP 08104549 A EP08104549 A EP 08104549A EP 08104549 A EP08104549 A EP 08104549A EP 2025476 B1 EP2025476 B1 EP 2025476B1
Authority
EP
European Patent Office
Prior art keywords
hand tool
electric hand
heat exchanger
cooling
cooling circuit
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
EP08104549A
Other languages
German (de)
English (en)
Other versions
EP2025476A1 (fr
Inventor
Stefan Schmid
Holger Cecchin
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 EP2025476A1 publication Critical patent/EP2025476A1/fr
Application granted granted Critical
Publication of EP2025476B1 publication Critical patent/EP2025476B1/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
    • B25D17/22—Devices for cleaning or cooling tool or work using pressure fluid

Definitions

  • the invention relates to an electric hand tool device with an outer housing, in which a motor, a transmission, a striking mechanism and an electronic control system and a closed cooling circuit for a cooling medium for cooling the aforementioned components of the electric hand tool device is provided.
  • the mechanical energy supplied by the engine is converted via the transmission and percussion in a rotational and / or impact movement for the arranged in the electric hand tool tool.
  • a disadvantage of the known solution is that the cooling medium can not sufficiently dissipate the heat absorbed in the environment during prolonged operation and therefore heats up. Until the achievement of a sufficiently low temperature level of the cooling medium, the use of the known electric hand tool device must be suspended.
  • the object of the invention is to provide an electric hand tool device with a closed cooling circuit for cooling the components, wherein the electric hand tool device has a degree of protection of IPX4 and higher and allows continuous operation of the electric hand tool device over a longer period.
  • a fixedly connected to the electric hand tool device heat exchanger is provided in the cooling circuit for cooling the cooling medium.
  • the cooling medium is advantageously liquid and comprises, for example, water.
  • the electric hand tool device can be operated much longer in continuous operation, as it is possible with at least partially striking electric hand tool devices of the known type.
  • a heat exchanger a device which the surface between the cooling medium, for. As a liquid cooling medium such as water, and another medium, for. As a gaseous medium such as air, increased.
  • the heat exchanger is made of a material which has good heat conduction and a large surface area.
  • the heat exchanger has, for example, tubes or hollow plates made of metal, which are guided back and forth in a limited space and are flowed through by the cooling medium. This is a larger surface for the transfer of heat from the cooling medium to the other medium available, as in a pure wiring, as for example from the DE 100 37 418 A1 is known.
  • Such heat exchangers are also referred to as heat exchangers.
  • the heat exchange is advantageously carried out by free convection.
  • the heat exchange takes place by means of a forced convection, for example by means of a fan arranged on the heat exchanger.
  • the closed cooling circuit arranged in the outer housing and the heat exchanger fixedly connected to the electric hand tool device Due to the closed cooling circuit arranged in the outer housing and the heat exchanger fixedly connected to the electric hand tool device, a complete encapsulation of the components of the electric hand tool device is possible while ensuring sufficient cooling of the components.
  • the requirements for a degree of protection of IPX4 and higher can be met with a simple structural design of the electric hand tool device.
  • the user can also use the electric hand tool device in rain or outdoors under wet conditions.
  • the power tool device is versatile and can be used without interference from this projecting elements, as in ensuring sufficient cooling of the components of the electric hand tool no external cooling unit or an external connection for the cooling medium is required.
  • a bypass is provided in the cooling circuit for bypassing the heat exchanger, which advantageously conducts the cooling medium around the heat exchanger in a temperature-controlled manner.
  • an optimum operating temperature of the electric hand tool device can be achieved quickly. Once the operating temperature is reached, the cooling medium is passed through the heat exchanger for sufficient cooling of the individual components of the electric hand tool device again.
  • correspondingly designed valves are provided at the ends of the bypass as a function of the control coming to the application.
  • the heat exchanger upstream of the control electronics in the cooling circuit, which ensures advantageous cooling of the control electronics, since the cooling medium cooled by the heat exchanger has not yet been reheated by another, heat-emitting component of the electric hand tool. This ensures a high level of protection of the electronic components from overheating even during continuous operation of the electric hand tool device.
  • the heat exchanger for direct heat transfer with the ambient air is arranged on the outer housing of the electric hand tool device. This ensures an advantageous heat transfer from the cooling medium to the air surrounding the electric hand tool and allows a simple configuration of the electric hand tool.
  • the heat exchanger for improved heat transfer is arranged on the outside of the outer housing.
  • the lines of the cooling circuit are passed through the outer housing, the implementation is advantageously sealed.
  • a pressure-generating pump is provided for the cooling medium, wherein the pump is connected downstream of the heat exchanger in the cooling circuit.
  • the cooling medium is drawn by the pump permanently through the heat exchanger and brought to a sufficient level for sufficient cooling of the components of the electric hand tool.
  • the pump is arranged between the control electronics and the motor and mechanically coupled to the drive for their drive.
  • FIGURE shows a schematic representation of an electric hand tool device in side view.
  • the liquid-cooled electric hand tool device 11 shown in the figure has an outer housing 12 with a handle 13.
  • a motor 16, a gear 17, a striking mechanism 18 and a control electronics 19 are arranged.
  • closed cooling circuit 21 is further provided with a heat exchanger 26 for cooling the liquid cooling medium, the heat exchanger 26 is in communication with the environment and is arranged directly on the outer housing 12 ,
  • the heat exchanger 26 is connected upstream of the control electronics 19 in the cooling circuit 21.
  • a pressure-generating pump 31 is provided, which is connected downstream of the heat exchanger 26 in the cooling circuit.
  • upstream and downstream is understood to mean an arrangement before or after a component, in each case based on the direction of flow of the cooling medium.
  • the direction of flow of the cooling medium is indicated in this illustration by the arrows 22 and 23.
  • a bypass 24 is provided in the cooling circuit 21 for bypassing the heat exchanger 26, via which the cooling medium can be passed around the heat exchanger 26 until it reaches the optimum operating temperature of the electric hand tool 11.

Landscapes

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

Claims (4)

  1. Outil électrique tenu à la main comportant un boîtier extérieur (12), dans lequel sont prévus un moteur (16), un bloc d'engrenages (17), un mécanisme de percussion (18) et une électronique de commande (19) ainsi qu'un circuit de refroidissement fermé (21) pour un fluide de refroidissement destiné à refroidir les composants mentionnés ci-dessus de l'outil électrique tenu à la main (11), caractérisé en ce qu'un échangeur de chaleur (26) fixement relié à l'outil électrique tenu à la main (11) est prévu dans le circuit de refroidissement (21) pour refroidir le fluide de refroidissement, et en ce qu'une dérivation (24) est prévue dans le circuit de refroidissement (21) pour contourner l'échangeur de chaleur (26).
  2. Outil électrique tenu à la main selon la revendication 1, caractérisé en ce que l'échangeur de chaleur (26) est intercalé dans le circuit de refroidissement (21) en amont de l'électronique de commande (19).
  3. Outil électrique tenu à la main selon la revendication 1 ou 2, caractérisé en ce que l'échangeur de chaleur (26) est agencé sur le boîtier extérieur (12).
  4. Outil électrique tenu à la main selon l'une quelconque des revendications 1 à 3, caractérisé en ce qu'une pompe générant une pression (31) est prévue pour le fluide de refroidissement, dans lequel la pompe (31) est intercalée dans le circuit de refroidissement en aval de l'échangeur de chaleur (26).
EP08104549A 2007-08-16 2008-06-26 Outil électrique manuel Active EP2025476B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102007038555A DE102007038555A1 (de) 2007-08-16 2007-08-16 Elektrohandwerkzeuggerät

Publications (2)

Publication Number Publication Date
EP2025476A1 EP2025476A1 (fr) 2009-02-18
EP2025476B1 true EP2025476B1 (fr) 2010-10-27

Family

ID=39882240

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08104549A Active EP2025476B1 (fr) 2007-08-16 2008-06-26 Outil électrique manuel

Country Status (3)

Country Link
US (1) US20090044961A1 (fr)
EP (1) EP2025476B1 (fr)
DE (2) DE102007038555A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202010017684U1 (de) * 2010-06-23 2012-05-03 Bmz Batterien-Montage-Zentrum Gmbh Zellenverbundsystem für mobile Leistungsgeräte
AT510741B1 (de) * 2010-11-18 2014-11-15 Avl List Gmbh Stromerzeugungsaggregat
US20130309099A1 (en) * 2012-05-16 2013-11-21 Flow Control LLC Compact, Light Weight, Battery Operated, Self-Priming, Positive Displacement Pump
DE102012223902A1 (de) * 2012-12-20 2014-06-26 Robert Bosch Gmbh Handwerkzeugmaschine
DE102013204970A1 (de) * 2013-03-21 2014-10-09 Robert Bosch Gmbh Handwerkzeugmaschine
DE102014207867A1 (de) 2014-04-25 2015-10-29 Robert Bosch Gmbh Werkzeugmaschinenkühlungsvorrichtung
JP7221113B2 (ja) * 2019-03-29 2023-02-13 住友重機械ファインテック株式会社 工作機械用の液体循環装置及びタンク

Family Cites Families (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3294182A (en) * 1964-09-23 1966-12-27 Black & Decker Mfg Co Power tools
DE2538561C3 (de) * 1975-08-29 1980-06-04 Arnold 7312 Kirchheim Mueller Induktionsmotor
US4728840A (en) * 1987-03-16 1988-03-01 Westinghouse Electric Corp. Water-cooled AC and DC motor-generator set on a common shaft with series cooling flow path
DE3866533D1 (de) * 1988-01-30 1992-01-09 Rieter Ag Maschf Waermeabfuhr von textilmaschinen.
US5531279A (en) * 1994-04-12 1996-07-02 Indresco Inc. Sensor impulse unit
DE19631517A1 (de) * 1996-08-03 1998-02-05 Wacker Werke Kg Von einem Elektromotor angetriebenes, an Einphasenwechselstrom anschließbares, drehzahlvariables, handgehaltenes Elektrowerkzeug
US5859482A (en) * 1997-02-14 1999-01-12 General Electric Company Liquid cooled electric motor frame
DE19740464A1 (de) * 1997-09-15 1999-03-18 Hilti Ag Antriebsgerät für Hohlbohrwerkzeuge
DE19810910A1 (de) * 1998-03-13 1999-09-16 Hilti Ag Bohrgerät
SE521618C2 (sv) * 1998-07-31 2003-11-18 Volvo Lastvagnar Ab Förfarande och anordning för avluftning av ett kylvätskesystem till en förbränningsmotor
DE19846712A1 (de) * 1998-10-09 2000-04-13 Hilti Ag Gerät zur Bearbeitung eines harten Untergrundes
DE20010531U1 (de) * 2000-06-14 2001-10-18 Steiner Andreas Antriebseinheit für eine spanabhebende Bearbeitungsmaschine
DE10037418A1 (de) * 2000-07-19 2002-02-07 Hilti Ag Elektrohandwerkzeuggerät mit elektropneumatischem Schlagwerk
AU784583B2 (en) * 2001-07-14 2006-05-04 Hilti Aktiengesellschaft Support for supporting a power tool on a displacement carriage
DE10137159A1 (de) * 2001-07-30 2003-02-20 Hilti Ag Schlagendes Elektrohandwerkzeuggerät
US6769487B2 (en) * 2002-12-11 2004-08-03 Schlumberger Technology Corporation Apparatus and method for actively cooling instrumentation in a high temperature environment
US7270910B2 (en) * 2003-10-03 2007-09-18 Black & Decker Inc. Thermal management systems for battery packs
US7597157B2 (en) * 2004-09-24 2009-10-06 Robert Bosch Gmbh Electric power tool having cooling conduits

Also Published As

Publication number Publication date
DE102007038555A1 (de) 2009-02-19
DE502008001626D1 (de) 2010-12-09
EP2025476A1 (fr) 2009-02-18
US20090044961A1 (en) 2009-02-19

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