EP1302281A1 - Cooling air duct in an electric percussive tool - Google Patents

Cooling air duct in an electric percussive tool Download PDF

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Publication number
EP1302281A1
EP1302281A1 EP01811005A EP01811005A EP1302281A1 EP 1302281 A1 EP1302281 A1 EP 1302281A1 EP 01811005 A EP01811005 A EP 01811005A EP 01811005 A EP01811005 A EP 01811005A EP 1302281 A1 EP1302281 A1 EP 1302281A1
Authority
EP
European Patent Office
Prior art keywords
cooling
striking
cooling air
air
hand tool
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
EP01811005A
Other languages
German (de)
French (fr)
Other versions
EP1302281B1 (en
Inventor
Ferdinand Kristen
Hubert Daxenberg
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
Priority to AT01811005T priority Critical patent/ATE361182T1/en
Priority to DE50112450T priority patent/DE50112450D1/en
Priority to EP01811005A priority patent/EP1302281B1/en
Priority to CN02146822.2A priority patent/CN1411959A/en
Priority to PL356629A priority patent/PL203191B1/en
Priority to JP2002300498A priority patent/JP2003165073A/en
Priority to US10/270,940 priority patent/US6776245B2/en
Publication of EP1302281A1 publication Critical patent/EP1302281A1/en
Application granted granted Critical
Publication of EP1302281B1 publication Critical patent/EP1302281B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S173/00—Tool driving or impacting
    • Y10S173/02—Sound muffling

Definitions

  • the invention relates to an at least partially striking electric hand tool device, such as a hammer drill, combination and chisel hammer, with electro-pneumatic hammer mechanism preferably for striking abrasive removal of rock.
  • electric hand tool device such as a hammer drill, combination and chisel hammer
  • electro-pneumatic hammer mechanism preferably for striking abrasive removal of rock.
  • Such handheld power tools generate from electrical energy by means of an electric motor and more suitable mechanical transformation an axial, swinging swinging and optional additional a superimposed rotating movement, which one for appropriate use Tool is transferred non-positively and positively.
  • DE3205063A1 cool electric hand tools by means of one Cooling fan of the electric motor through cooling air drawn in through air openings in the housing, which by the pneumatic striking mechanism and by cavities between the Percussion mechanism assembly and the machine housing is pressed, also the percussion mechanism.
  • DE19600339C1 forms a striking hand tool between the Outer housing and the components of the drive and gearbox different air ducts out.
  • a movable guide tube is a striking Hand tool device thermally insulated via an air gap to the outer housing.
  • a striking hand tool device has a Percussion mechanism assembly, which is mounted within the vibration-damped External housing with the handle attached to it can be moved separately.
  • the object of the invention is to implement a well-cooled, in Outer housing vibration-dampened movable striking mechanism Electric power tool.
  • it has an at least partially striking electric hand tool device an electropneumatic striking mechanism in a striking mechanism assembly, which in a Vents for a cooling fan, outer housing vibration-damped is movable, at least one cooling air line attached to the striking mechanism assembly Cooling fan on.
  • the end of the cooling air line is advantageously at least one, essentially annular Cooling, air flow-conducting cooling ring connected, whereby the striking mechanism in the is essentially uniformly coolable.
  • the cooling ring advantageously has circumferentially distributed ring openings, as a result of which the Air openings in the outer housing in the cooling ring flowing cooling air flow circumferentially is distributed.
  • FIG. 1 shows the electric hand tool device 1 striking along an axis A.
  • the cooling air line 7 has an annularly cooling airflow-conducting cooling ring 8 at the end connected, which is attached near a gas spring 9 of the striking mechanism 2.
  • the cooling ring 8 has circumferentially distributed rim openings 10 which close to the air openings 4 in the Outer housing 6 are arranged, through which the air flow 11 via the cooling air line 7 to the electric motor 12, further to the cooling fan 5 and behind this to the Air outlet openings 13 located in the outer housing 6 without there being a backflow 14 can lead to an air short circuit.
  • the cooling ring 8 is mounted concentrically on the striking mechanism assembly 3 circumferentially distributed rim openings 10, which are connected to the Cooling air line 7 are connected.
  • the air flow 11 passes through the ring openings 10 spatially assigned, air openings 4 in the outer housing 6 into the cooling air line 7.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Abstract

An electrically operated hand tool (1) has a partially striking electro-pneumatic striking tool mechanism (2) in a subassembly (3) that has its vibration suppressed and moves in an outer casing (6) with air vents (4) for a cooling fan (5). Cooling air conduction (7) for the cooling fan fastens on the subassembly.

Description

Die Erfindung betrifft ein zumindest teilweise schlagendes Elektrohandwerkzeuggerät, wie einen Bohrhammer, Kombi- und Meisselhammer, mit elektropneumatischem Schlagwerk vorzugsweise zum schlagend abrasiven Abtrag von Gestein. Derartige Elektrohandwerkzeuggeräte erzeugen aus elektrischer Energie mittels eines Elektromotors und geeigneter mechanischer Transformation eine axiale, schlagend schwingende und optional zusätzlich eine überlagerte drehende Bewegung, welche zur zweckentsprechenden Verwendung einem Werkzeug kraft- und formschlüssig übertragen wird.The invention relates to an at least partially striking electric hand tool device, such as a hammer drill, combination and chisel hammer, with electro-pneumatic hammer mechanism preferably for striking abrasive removal of rock. Such handheld power tools generate from electrical energy by means of an electric motor and more suitable mechanical transformation an axial, swinging swinging and optional additional a superimposed rotating movement, which one for appropriate use Tool is transferred non-positively and positively.

Bei in dieser Erfindung ausschliesslich betrachteten elektropneumatischen Schlagwerken wird die zumeist von einem Elektromotor erzeugte mechanische Energie über einen Exzenter auf einen oszillierenden Erregerkolben und von diesem pneumatisch über eine Gasfeder auf einen Flugkolben übertragen, welcher über einen Döpper diese mechanische Schlagenergie weitgehend auf das schlagende oder schlagdrehende Werkzeug weitergibt. Durch die wiederholte Verdichtung und Entspannung der Luftsäule der Gasfeder entsteht auf Grund thermodynamischer Prozesse eine Abwärme, die durch Wärmeleitung und Wärmekonvektion nach Aussen abgeführt werden muss.With electropneumatic percussion mechanisms considered exclusively in this invention the mechanical energy usually generated by an electric motor is transferred via a Eccentric on an oscillating exciter piston and pneumatically by this Transfer gas spring to a flying piston, which uses a striker to mechanically Impact energy largely on the striking or impact rotating tool. Due to the repeated compression and expansion of the air column, the gas spring arises Due to thermodynamic processes, waste heat caused by heat conduction and heat convection must be dissipated to the outside.

Nach der DE3205063A1 kühlen Elektrohandwerkzeuggeräte mittels der von einem Kühlgebläse des Elektromotors durch Luftöffnungen im Gehäuse angesaugten Kühlluft, welche durch das pneumatische Schlagwerk und durch Hohlräume zwischen der Schlagwerksbaugruppe und dem Maschinengehäuse gedrückt wird, auch das Schlagwerk. Nach der DE19600339C1 bildet ein schlagendes Handwerkzeuggerät zwischen dem Aussengehäuse und den Baugruppen des Antriebs und Getriebes verschiedene Luftkanäle aus. Nach der US4353425 ist ein bewegliches Führungsrohr eines schlagenden Handwerkzeuggerätes über einen Luftspalt zum Aussengehäuse thermisch isoliert.According to DE3205063A1 cool electric hand tools by means of one Cooling fan of the electric motor through cooling air drawn in through air openings in the housing, which by the pneumatic striking mechanism and by cavities between the Percussion mechanism assembly and the machine housing is pressed, also the percussion mechanism. According to DE19600339C1 forms a striking hand tool between the Outer housing and the components of the drive and gearbox different air ducts out. According to US4353425, a movable guide tube is a striking Hand tool device thermally insulated via an air gap to the outer housing.

Durch die zweckentsprechende Wechselwirkung mit einem Werkstück eines durch den Nutzer über den Handgriff druckseitig vorbelasteten und vom Elektrohandwerkzeuggerät axial überlagernd, schlagend angetriebenen Werkzeugs führt ein am Gehäuse befestigter Handgriff axiale Schwingungen aus, die möglichst vollständig zu unterbinden sind. Durch die bei zueinander beweglichen Gehäuseteilen auftretenden Dichtungsprobleme sind keine Kühlkanäle zwischen diesen ausbildbar, wodurch es im Kühlluftstrom partiell zu Luftkurzschlüssen kommt, welche die Kühlleistung verringern.Through the appropriate interaction with a workpiece one by the User preloaded on the pressure side via the handle and from the electric hand tool device axially overlapping, impact driven tool leads a fixed to the housing Handle axial vibrations, which are to be prevented as completely as possible. Through the there are no sealing problems with housing parts that can move relative to one another Cooling channels can be formed between them, which means that it partially closes in the cooling air flow Air short circuits occur, which reduce the cooling capacity.

Nach der DE3405922 weist ein schlagendes Handwerkzeuggerät eine Schlagwerksbaugruppe auf, welche innerhalb des vibrationsgedämpft gelagerten Aussengehäuses mit dem daran befestigten Handgriff getrennt beweglich ist.According to DE3405922, a striking hand tool device has a Percussion mechanism assembly, which is mounted within the vibration-damped External housing with the handle attached to it can be moved separately.

Die Aufgabe der Erfindung besteht in der Realisierung eines gut gekühlten, im Aussengehäuse vibrationsgedämpft beweglichen Schlagwerks eines Elektrohandwerkzeuggerätes.The object of the invention is to implement a well-cooled, in Outer housing vibration-dampened movable striking mechanism Electric power tool.

Die Aufgabe wird im wesentlichen durch die Merkmale der unabhängigen Ansprüche gelöst. Vorteilhafte Weiterbildungen ergeben sich aus den Unteransprüchen.The task is essentially solved by the features of the independent claims. Advantageous further developments result from the subclaims.

Im wesentlichen weist ein zumindest teilweise schlagendes Elektrohandwerkzeuggerät mit einem elektropneumatischen Schlagwerk in einer Schlagwerksbaugruppe, welche in einem, Luftöffnungen für ein Kühlgebläse aufweisenden, Aussengehäuse vibrationsgedämpft beweglich ist, zumindest eine an der Schlagwerksbaugruppe befestigte Kühlluftleitung zum Kühlgebläse auf.Essentially, it has an at least partially striking electric hand tool device an electropneumatic striking mechanism in a striking mechanism assembly, which in a Vents for a cooling fan, outer housing vibration-damped is movable, at least one cooling air line attached to the striking mechanism assembly Cooling fan on.

Durch die an der Schlagwerksbaugruppe befestigte Kühlluftleitung treten keine Dichtungsprobleme zwischen der vibrationsgedämpft bis zu ca. 10 mm beweglichen Schlagwerksbaugruppe und dem Aussengehäuse auf, wodurch ein, die Kühlleistung des Kühlluftstroms reduzierender; Luftkurzschluss vom Luftaustritt zum Lufteintritt des Kühlgebläses verhindert wird.There is no passage through the cooling air line attached to the striking mechanism assembly Sealing problems between the vibration damped up to about 10 mm movable Percussion mechanism assembly and the outer housing, thereby increasing the cooling capacity of the Cooling air flow reducing; Air short circuit from the air outlet to the air inlet of the Cooling fan is prevented.

Vorteilhaft ist die Kühlluftleitung endseitig mit zumindest einem, im wesentlichen ringförmig kühlenden, luftstromleitenden Kühlkranz verbunden, wodurch das Schlagwerk im wesentlichen gleichmässig umfänglich kühlbar ist.The end of the cooling air line is advantageously at least one, essentially annular Cooling, air flow-conducting cooling ring connected, whereby the striking mechanism in the is essentially uniformly coolable.

Vorteilhaft weist der Kühlkranz umfänglich verteilte Kranzöffnungen auf, wodurch der über Luftöffnungen im Aussengehäusse in den Kühlkranz einströmende Kühlluftstrom umfänglich verteilt wird.The cooling ring advantageously has circumferentially distributed ring openings, as a result of which the Air openings in the outer housing in the cooling ring flowing cooling air flow circumferentially is distributed.

Die Erfindung wird bezüglich eines vorteilhaften Ausführungsbeispiels näher erläutert mit

  • Fig. 1 als Elektrohandwerkzeuggerät
  • Fig. 2 als Teilschnitt
    • The invention is explained in more detail with respect to an advantageous embodiment
  • Fig. 1 as an electric hand tool device
  • Fig. 2 as a partial section

    • Nach Fig. 1 weist das längs einer Achse A schlagende Elektrohandwerkzeuggerät 1 ein elektropneumatisches Schlagwerk 2 in einer Schlagwerksbaugruppe 3 auf, welche in einem, Luftöffnungen 4 für ein Kühlgebläse 5 aufweisenden, Aussengehäuse 6 durch eine elastische Aufhängung vibrationsgedämpft beweglich ist, wobei an der Schlagwerksbaugruppe 3 eine Kühlluftleitung 7 zum Kühlgebläse 5 befestigt ist. Die Kühlluftleitung 7 ist endseitig mit einem ringförmig kühlenden luftstromleitenden Kühlkranz 8 verbunden, welcher nahe einer Gasfeder 9 des Schlagwerks 2 befestigt ist. Der Kühlkranz 8 weist umfänglich verteilte Kranzöffnungen 10 auf, welche nahe den Luftöffnungen 4 im Aussengehäuse 6 angeordnet sind, durch welche der Luftstrom 11 über die Kühlluftleitung 7 zum Elektromotor 12, weiter zum Kühlgebläse 5 und hinter diesem zu den Luftaustrittsöffnungen 13 im Aussengehäuse 6 gelagt, ohne dass es eine Rückströmung 14 zu einem Luftkurzschluss führen kann.1 shows the electric hand tool device 1 striking along an axis A. electropneumatic striking mechanism 2 in a striking mechanism assembly 3, which in one, Air openings 4 for a cooling fan 5, outer housing 6 through a elastic suspension is movable in a vibration-damped manner, being at the Percussion mechanism assembly 3, a cooling air line 7 is attached to the cooling fan 5. The The cooling air line 7 has an annularly cooling airflow-conducting cooling ring 8 at the end connected, which is attached near a gas spring 9 of the striking mechanism 2. The cooling ring 8 has circumferentially distributed rim openings 10 which close to the air openings 4 in the Outer housing 6 are arranged, through which the air flow 11 via the cooling air line 7 to the electric motor 12, further to the cooling fan 5 and behind this to the Air outlet openings 13 located in the outer housing 6 without there being a backflow 14 can lead to an air short circuit.

    Nach Fig. 2 weist der konzentrisch auf der Schlagwerksbaugruppe 3 befestigte Kühlkranz 8 umfänglich verteilte Kranzöffnungen 10 auf, welche über einen Ringkanal 15 mit der Kühlluftleitung 7 verbunden sind. Der Luftstrom 11 tritt über die, den Kranzöffnungen 10 räumlich zugeordneten, Luftöffnungen 4 im Aussengehäuse 6 in die Kühlluftleitung 7 ein.According to FIG. 2, the cooling ring 8 is mounted concentrically on the striking mechanism assembly 3 circumferentially distributed rim openings 10, which are connected to the Cooling air line 7 are connected. The air flow 11 passes through the ring openings 10 spatially assigned, air openings 4 in the outer housing 6 into the cooling air line 7.

    Claims (3)

    Elektrohandwerkzeuggerät mit einem zumindest teilweise schlagenden elektropneumatischen Schlagwerk (2) in einer Schlagwerksbaugruppe (3), welches in einem, Luftöffnungen (4) für ein Kühlgebläse (5) aufweisenden, Aussengehäuse (6) vibrationsgedämpft beweglich ist, dadurch gekennzeichnet, dass an der Schlagwerksbaugruppe (3) zumindest eine Kühlluftleitung (7) zum Kühlgebläse (5) befestigt ist.Electric hand tool device with an at least partially striking electropneumatic striking mechanism (2) in a striking mechanism assembly (3), which can be moved in a vibration-damping manner in an outer housing (6) having air openings (4) for a cooling fan (5), characterized in that on the striking mechanism assembly ( 3) at least one cooling air line (7) to the cooling fan (5) is attached. Elektrohandwerkzeuggerät nach Anspruch 1, dadurch gekennzeichnet, dass die Kühlluftleitung (7) endseitig mit zumindest einem, im wesentlichen ringförmig kühlenden, luftstromleitenden Kühlkranz (8) verbunden ist.Electric hand tool device according to claim 1, characterized in that the cooling air line (7) is connected at the end to at least one, essentially annularly cooling, air flow-conducting cooling ring (8). Elektrohandwerkzeuggerät nach Anspruch 1, dadurch gekennzeichnet, dass der Kühlkranz (8) umfänglich verteilte Kranzöffnungen (10) aufweist.Electric hand tool device according to claim 1, characterized in that the cooling ring (8) has circumferentially distributed ring openings (10).
    EP01811005A 2001-10-15 2001-10-15 Cooling air duct in an electric percussive tool Expired - Lifetime EP1302281B1 (en)

    Priority Applications (7)

    Application Number Priority Date Filing Date Title
    AT01811005T ATE361182T1 (en) 2001-10-15 2001-10-15 COOLING AIR LINE FOR AN ELECTRICAL HAND TOOL WITH ELECTROPNEUMATIC IMPACT MACHINE
    DE50112450T DE50112450D1 (en) 2001-10-15 2001-10-15 Cooling air duct for an electric hand tool with electro-pneumatic impact mechanism
    EP01811005A EP1302281B1 (en) 2001-10-15 2001-10-15 Cooling air duct in an electric percussive tool
    CN02146822.2A CN1411959A (en) 2001-10-15 2002-10-11 Hand-held electric tool machine with electric pneumatic impact tool
    PL356629A PL203191B1 (en) 2001-10-15 2002-10-14 Hand-held equipment with an electrically powered tool and an electropneumatic impact mechanism
    JP2002300498A JP2003165073A (en) 2001-10-15 2002-10-15 Motor-driven hand tool device
    US10/270,940 US6776245B2 (en) 2001-10-15 2002-10-15 Electrical hand-held power tool with an electropneumatic percussion mechanism

    Applications Claiming Priority (1)

    Application Number Priority Date Filing Date Title
    EP01811005A EP1302281B1 (en) 2001-10-15 2001-10-15 Cooling air duct in an electric percussive tool

    Publications (2)

    Publication Number Publication Date
    EP1302281A1 true EP1302281A1 (en) 2003-04-16
    EP1302281B1 EP1302281B1 (en) 2007-05-02

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    ID=8184189

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP01811005A Expired - Lifetime EP1302281B1 (en) 2001-10-15 2001-10-15 Cooling air duct in an electric percussive tool

    Country Status (7)

    Country Link
    US (1) US6776245B2 (en)
    EP (1) EP1302281B1 (en)
    JP (1) JP2003165073A (en)
    CN (1) CN1411959A (en)
    AT (1) ATE361182T1 (en)
    DE (1) DE50112450D1 (en)
    PL (1) PL203191B1 (en)

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    Also Published As

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    PL356629A1 (en) 2003-04-22
    JP2003165073A (en) 2003-06-10
    DE50112450D1 (en) 2007-06-14
    CN1411959A (en) 2003-04-23
    ATE361182T1 (en) 2007-05-15
    PL203191B1 (en) 2009-09-30
    EP1302281B1 (en) 2007-05-02
    US6776245B2 (en) 2004-08-17
    US20030070823A1 (en) 2003-04-17

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