EP1302281B1 - 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
EP1302281B1
EP1302281B1 EP01811005A EP01811005A EP1302281B1 EP 1302281 B1 EP1302281 B1 EP 1302281B1 EP 01811005 A EP01811005 A EP 01811005A EP 01811005 A EP01811005 A EP 01811005A EP 1302281 B1 EP1302281 B1 EP 1302281B1
Authority
EP
European Patent Office
Prior art keywords
cooling
hand tool
cooling air
air duct
air
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.)
Expired - Lifetime
Application number
EP01811005A
Other languages
German (de)
French (fr)
Other versions
EP1302281A1 (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 DE50112450T priority Critical patent/DE50112450D1/en
Priority to EP01811005A priority patent/EP1302281B1/en
Priority to AT01811005T priority patent/ATE361182T1/en
Priority to CN02146822.2A priority patent/CN1411959A/en
Priority to PL356629A priority patent/PL203191B1/en
Priority to US10/270,940 priority patent/US6776245B2/en
Priority to JP2002300498A priority patent/JP2003165073A/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 beating electric hand tool device, such as a hammer drill, combi and chisel hammer, with electro-pneumatic striking mechanism preferably for hitting abrasive removal of rock.
  • electric hand tool devices generate from electrical energy by means of an electric motor and suitable mechanical transformation of an axial, hitting swinging and optionally additionally a superimposed rotating movement, which is transmitted to the appropriate use a tool force and form fit.
  • DE19626254A1 cool electric hand tool devices by means of the sucked by a cooling fan of the electric motor through air openings in the housing cooling air, which is pressed by the pneumatic percussion and cavities between the percussion unit and the machine housing, and the percussion.
  • DE19600339C1 forms a striking hand tool between the outer housing and the assemblies of the drive and transmission various air channels.
  • a movable guide tube of a beating hand tool is thermally insulated via an air gap to the outer housing.
  • DE3405922 has a striking hand tool on a percussion unit, which is movable separately within the vibration damped mounted outer housing with the handle attached thereto.
  • the object of the invention is the realization of a well-cooled, vibration-dampened in the outer housing movable striking mechanism of an electric hand tool.
  • an at least partially striking electric hand tool device with an electro-pneumatic percussion in a percussion unit which in a, air openings for a cooling fan having outer housing is vibration-dampened, at least one attached to the percussion unit cooling air line to the cooling fan.
  • the cooling air line is connected at the end to at least one, substantially annular cooling, airflow-conducting cooling ring, whereby the impact mechanism is substantially uniformly circumferentially coolable.
  • the cooling ring has circumferentially distributed annular openings, whereby the cooling air flow flowing into the cooling ring via air openings in the outer housing is distributed circumferentially.
  • Fig. 1 the striking along an axis A electric hand tool 1 an electropneumatic percussion 2 in a percussion unit 3, which is vibration damped in an air openings 4 for a cooling fan 5, outer housing 6 by an elastic suspension, wherein on the percussion unit 3 a cooling air duct 7 is attached to the cooling fan 5.
  • the cooling air line 7 is connected at the end to an annular cooling airflow-conducting cooling ring 8, which is fastened near a gas spring 9 of the impact mechanism 2.
  • the cooling ring 8 has circumferentially distributed ring openings 10, which are arranged near the air openings 4 in the outer housing 6, 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 in the outer housing 6, without it can cause a return flow 14 to an air short circuit.
  • the cooling rim 8 which is concentrically mounted on the percussion unit 3, has circumferentially distributed rim openings 10, which are connected to the cooling air line 7 via an annular channel 15.
  • the air flow 11 enters via the, the rim openings 10 spatially associated, air openings 4 in the outer housing 6 in the cooling air line 7 a.

Landscapes

  • 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 beating electric hand tool device, such as a hammer drill, combi and chisel hammer, with electro-pneumatic striking mechanism preferably for hitting abrasive removal of rock. Such electric hand tool devices generate from electrical energy by means of an electric motor and suitable mechanical transformation of an axial, hitting swinging and optionally additionally a superimposed rotating movement, which is transmitted to the appropriate use a tool force and form fit.

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.In electropneumatic percussion exclusively considered in this invention, the mechanical energy generated mostly by an electric motor is transmitted via an eccentric on an oscillating exciter piston and pneumatically via a gas spring on a flying piston, which over a striker this mechanical impact energy largely on the striking or striking tool passes. The repeated compression and expansion of the air column of the gas spring creates a waste heat due to thermodynamic processes, which must be dissipated by heat conduction and heat convection to the outside.

Nach der DE19626254A1 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 DE19626254A1 cool electric hand tool devices by means of the sucked by a cooling fan of the electric motor through air openings in the housing cooling air, which is pressed by the pneumatic percussion and cavities between the percussion unit and the machine housing, and the percussion. According to DE19600339C1 forms a striking hand tool between the outer housing and the assemblies of the drive and transmission various air channels. According to US4353425 a movable guide tube of a beating hand tool is 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.Due to the appropriate interaction with a workpiece by the user via the handle on the pressure side preloaded and axially superimposed by the electric hand tool, hitting driven tool performs an attached to the housing handle axial vibrations that are as completely as possible to prevent. Due to the occurring with mutually movable housing parts sealing problems are no Cooling channels between these can be formed, which is partially in the cooling air flow to air short circuits, 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 has a striking hand tool on a percussion unit, which is movable separately within the vibration damped mounted outer housing with the handle attached thereto.

Die Aufgabe der Erfindung besteht in der Realisierung eines gut gekühlten, im Aussengehäuse vibrationsgedämpft beweglichen Schlagwerks eines Elektrohandwerkzeuggerätes.The object of the invention is the realization of a well-cooled, vibration-dampened in the outer housing movable striking mechanism of an electric hand tool.

Die Aufgabe wird im wesentlichen durch die Merkmale der unabhängigen Ansprüche gelöst. Vorteilhafte Weiterbildungen ergeben sich aus den Unteransprüchen.The object is essentially achieved by the features of the independent claims. Advantageous developments emerge 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, an at least partially striking electric hand tool device with an electro-pneumatic percussion in a percussion unit, which in a, air openings for a cooling fan having outer housing is vibration-dampened, at least one attached to the percussion unit cooling air line to the cooling fan.

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.Due to the attached to the percussion unit cooling air duct no sealing problems between the vibration dampened up to about 10 mm movable percussion unit and the outer housing occur, creating a, reducing the cooling capacity of the cooling air flow; 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.Advantageously, the cooling air line is connected at the end to at least one, substantially annular cooling, airflow-conducting cooling ring, whereby the impact mechanism is substantially uniformly circumferentially coolable.

Vorteilhaft weist der Kühlkranz umfänglich verteilte Kranzöffnungen auf, wodurch der über Luftöffnungen im Aussengehäusse in den Kühlkranz einströmende Kühlluftstrom umfänglich verteilt wird.Advantageously, the cooling ring has circumferentially distributed annular openings, whereby the cooling air flow flowing into the cooling ring via air openings in the outer housing is distributed circumferentially.

Die Erfindung wird bezüglich eines vorteilhaften Ausführungsbeispiels näher erläutert mit

  • Fig. 1 als Elektrohandwerkzeuggerät
  • Fig. 2 als Teilschnitt
The invention will be explained in more detail with respect to an advantageous embodiment
  • Fig. 1 as electric hand tool
  • 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.According to Fig. 1, the striking along an axis A electric hand tool 1 an electropneumatic percussion 2 in a percussion unit 3, which is vibration damped in an air openings 4 for a cooling fan 5, outer housing 6 by an elastic suspension, wherein on the percussion unit 3 a cooling air duct 7 is attached to the cooling fan 5. The cooling air line 7 is connected at the end to an annular cooling airflow-conducting cooling ring 8, which is fastened near a gas spring 9 of the impact mechanism 2. The cooling ring 8 has circumferentially distributed ring openings 10, which are arranged near the air openings 4 in the outer housing 6, 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 in the outer housing 6, without it can cause a return flow 14 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 rim 8, which is concentrically mounted on the percussion unit 3, has circumferentially distributed rim openings 10, which are connected to the cooling air line 7 via an annular channel 15. The air flow 11 enters via the, the rim openings 10 spatially associated, air openings 4 in the outer housing 6 in the cooling air line 7 a.

Claims (3)

  1. Electric hand tool with an at least partially striking electro-pneumatic woodpecker system (2) in a woodpecker unit (3), which can move with vibration damping in an outer housing (6) exhibiting air openings (4) for a cooling fan(5), characterised by the fact that on the woodpecker unit (3) at least one cooling air duct (7) is attached to the cooling fan (5).
  2. Electric hand tool according to Claim 1, characterised by the fact that the cooling air duct (7) is at is end with at least one essentially annular cooling, airstream conducting cooling face1 (8).
  3. Electric hand tool according to Claim 1, characterised by the fact that the cooling face1 (8) exhibits comprehensively distributed face1 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
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
AT01811005T ATE361182T1 (en) 2001-10-15 2001-10-15 COOLING AIR LINE FOR AN ELECTRICAL HAND TOOL WITH ELECTROPNEUMATIC IMPACT MACHINE
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
US10/270,940 US6776245B2 (en) 2001-10-15 2002-10-15 Electrical hand-held power tool with an electropneumatic percussion mechanism
JP2002300498A JP2003165073A (en) 2001-10-15 2002-10-15 Motor-driven hand tool device

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 EP1302281A1 (en) 2003-04-16
EP1302281B1 true 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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US6776245B2 (en) 2004-08-17
US20030070823A1 (en) 2003-04-17
EP1302281A1 (en) 2003-04-16
CN1411959A (en) 2003-04-23
JP2003165073A (en) 2003-06-10
ATE361182T1 (en) 2007-05-15
PL356629A1 (en) 2003-04-22
DE50112450D1 (en) 2007-06-14
PL203191B1 (en) 2009-09-30

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