EP2047951B1 - Manual machine tool with a crank drive - Google Patents

Manual machine tool with a crank drive Download PDF

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Publication number
EP2047951B1
EP2047951B1 EP08105405A EP08105405A EP2047951B1 EP 2047951 B1 EP2047951 B1 EP 2047951B1 EP 08105405 A EP08105405 A EP 08105405A EP 08105405 A EP08105405 A EP 08105405A EP 2047951 B1 EP2047951 B1 EP 2047951B1
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EP
European Patent Office
Prior art keywords
crankshaft
hand
power tool
hollow
held power
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.)
Not-in-force
Application number
EP08105405A
Other languages
German (de)
French (fr)
Other versions
EP2047951A1 (en
Inventor
Josef Fünfer
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
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Filing date
Publication date
Application filed by Hilti AG filed Critical Hilti AG
Publication of EP2047951A1 publication Critical patent/EP2047951A1/en
Application granted granted Critical
Publication of EP2047951B1 publication Critical patent/EP2047951B1/en
Not-in-force 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
    • B25D11/00—Portable percussive tools with electromotor or other motor drive
    • B25D11/06—Means for driving the impulse member
    • B25D11/12—Means for driving the impulse member comprising a crank mechanism
    • B25D11/125—Means for driving the impulse member comprising a crank mechanism with a fluid cushion between the crank drive and the striking body
    • 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
    • B25D2211/006—Parallel 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
    • B25D2222/00—Materials of the tool or the workpiece
    • B25D2222/21—Metals
    • B25D2222/24—Aluminium

Definitions

  • the invention relates to a hand tool machine with a connecting rod and an axially rotatable crankshaft, in particular an at least partially striking combination hammer or a chisel hammer according to the preamble of claim 1 and as from EP 0 583 710 A or the GB 24090 A known.
  • crank gear is used to implement the rotational movement in a reciprocating motion to drive the exciter piston, which drives the shank piston via an air spring, which generates the impact on the tool.
  • the connecting rod and the, these via an eccentric crank pin driving, axially rotatable crankshaft are solid to achieve a sufficient component rigidity and component strength.
  • the connecting rod is a strongly (alternately) accelerated component. A reduction in their mass thus leads to economies of scale in the mass reduction in other components. Therefore, for example, after the DE3910599 the connecting rod formed hollow.
  • the gears of the transmission and the crankshaft contributes a high mass of these parts to a high rotational moment of inertia, which in principle is desirable because of the stored rotational energy for the synchronization.
  • a high mass increases, without providing an added benefit, as is the case, for example, in the conduction of the magnetic flux in the rotor, the entire machine mass.
  • DE3120834 is an internally mounted on a housing pin integral crankshaft coaxially hollow.
  • EP1355764 is an externally mounted one-piece crankshaft completely coaxially hollow.
  • the remaining wall thickness is in each case about one fifth of the diameter.
  • the task is to reduce the engine mass by a hollow, sufficiently stiff and strong crankshaft.
  • a hand tool machine has a crank mechanism with a connecting rod and a, the connecting rod on a crank pin overlapping, axially rotatable crankshaft, which is coaxially hollow and axially closed on both sides.
  • a crank pin bearing crank pin is hollow, whereby the component mass of the crankshaft is further reduced.
  • crankshaft Due to the design of the crankshaft as a coaxial hollow, but axially closed on both sides spatial form this forms a three-dimensionally closed surface (topologically similar to a spherical surface).
  • a substantial increase in component rigidity and component strength is achieved in comparison to the (topologically) two-fold axially open spatial forms given a given material, given wall thickness and (except for the axial termination) given spatial form, or a reduction of the wall thickness and thus of the component mass is made possible. This contributes to the reduction of the engine mass.
  • crankshaft is formed in two parts, in particular at the opposite axial end to the crank pin a plug is present, which closes the otherwise (topologically) simple open space form of the remaining crankshaft, whereby the latter by hydroforming (English hydroforming) can be produced inexpensively and technologically simple ,
  • the wall thickness of the remaining crankshaft (except for the plug) is less than one tenth of the associated shaft diameter, whereby the component mass of the crankshaft is further reduced.
  • crank pin itself is hollow, whereby the component mass and eccentricity of the crankshaft is further reduced.
  • two cylindrical bearing guides are formed on the crankshaft, each of which is advantageously associated with an axial stop, whereby (via one associated radial bearing) an externally guided bearing in the housing is supported.
  • crankshaft is radially tapered axially between the bearing guides, whereby the component mass of the crankshaft is minimized.
  • a rotary and beating hand tool 1 in the form of a combihammer a crank gear 2 for converting the rotational movement of a rotor 13 of the electric motor 14 in a reciprocating motion to drive the exciter piston 3, which drives the latching piston 5 via an air spring 4, via a Anvil 6 generates the impact on a tool 7 in the form of a drill bit.
  • the crank mechanism 2 has a connecting rod 8 and a, this via an eccentric crank pin 9 driving, axially rotatable crankshaft 10, which is guided in a radial bearing 11 in the housing 12.
  • crankshaft 10 With respect to a crank axis A coaxially hollow and axially closed on both sides, wherein at the opposite axial end to the crank pin 9, a plug 15 is present, which closes the otherwise simple open space shape of the remaining crankshaft 10.
  • the remaining crankshaft 10 is made by hydroforming from a tubular blank (not shown) made of an aluminum alloy.
  • the wall thickness W of this remaining crankshaft 10 is less than one-tenth of the associated shaft diameter D.
  • the crank pin 9 and a crank plate 16 carrying this itself is hollow.
  • On the crankshaft 10 are two axially spaced cylindrical bearing guides 17 for radial bearings 11 (FIGS. Fig. 1 ), each associated with an axial stop 18.
  • the crankshaft 10 is radially tapered axially between the bearing guides 17.

Abstract

The tool has a crank drive with an axially rotatable crankshaft (10) supporting a connecting rod at a crankshaft journal (9). The crankshaft is coaxially hollow-formed, and is axially closed at both sides. A plug (15) is provided opposite to the crankshaft journal at an axial end of the crankshaft. A wall thickness (W) of the hollow crankshaft amounts to less than one-tenth of the assigned shaft diameter (D). An axial stopper (18) is attached to a bearing guide (17), and the crankshaft is radially tapered axially between two bearing guides.

Description

Die Erfindung bezeichnet eine Handwerkzeugmaschine mit einer Pleuelstange und einer axial drehbaren Kurbelwelle, insbesondere einen zumindest teilweise schlagenden Kombihammer oder einen Meisselhammer nach dem Obergriff von Anspruch 1 und wie aus der EP 0 583 710 A oder der GB 24090 A bekannt.The invention relates to a hand tool machine with a connecting rod and an axially rotatable crankshaft, in particular an at least partially striking combination hammer or a chisel hammer according to the preamble of claim 1 and as from EP 0 583 710 A or the GB 24090 A known.

Das Kurbelgetriebe dient zur Umsetzung der Rotationsbewegung in eine Hin- und Herbewegung zum Antrieb des Erregerkolbens, der über eine Luftfeder den Schagkolben antreibt, der den Schlag auf das Werkzeug erzeugt.The crank gear is used to implement the rotational movement in a reciprocating motion to drive the exciter piston, which drives the shank piston via an air spring, which generates the impact on the tool.

Üblicherweise sind die Pleuelstange und die, diese über einen exzentrischen Kurbelzapfen antreibende, axial drehbare Kurbelwelle massiv ausgebildet, um eine hinreichende Bauteilsteifigkeit und Bauteiffestigkeit zu erzielen.Usually, the connecting rod and the, these via an eccentric crank pin driving, axially rotatable crankshaft are solid to achieve a sufficient component rigidity and component strength.

Bei der Pleuelstange handelt es sich um ein stark (wechselnd) beschleunigtes Bauteil. Eine Verringerung ihrer Masse führt somit zu Skaleneffekten in der Masseverringerung bei anderen Bauteilen. Deshalb ist bspw. nach der DE3910599 die Pleuelstange hohl ausgebildet.The connecting rod is a strongly (alternately) accelerated component. A reduction in their mass thus leads to economies of scale in the mass reduction in other components. Therefore, for example, after the DE3910599 the connecting rod formed hollow.

Bei den rotierenden Bauteilen wie dem Läufer des antreibenden Elektromotors, der Zahnräder des Getriebes und der Kurbelwelle hingegen trägt eine hohe Masse dieser Teile zu einem hohen Rotationsträgheitsmoment bei, welches als solches wegen der gespeicherten Rotationsenergie für den Gleichlauf prinzipiell erwünscht ist. Andererseits erhöht eine hohe Masse, ohne einen Zusatznutzen zu erbringen, wie das bspw. bei der Leitung des magnetischen Flusses im Läufer der Fall ist, die gesamte Maschinenmasse.In the rotating components such as the rotor of the driving electric motor, the gears of the transmission and the crankshaft, however, contributes a high mass of these parts to a high rotational moment of inertia, which in principle is desirable because of the stored rotational energy for the synchronization. On the other hand, a high mass increases, without providing an added benefit, as is the case, for example, in the conduction of the magnetic flux in the rotor, the entire machine mass.

Nach der DE3120834 ist eine auf einem Gehäusezapfen innengelagerte einstückige Kurbelwelle koaxial hohl ausgebildet. Nach der EP1355764 ist eine aussengelagerte einstückige Kurbelwelle vollständig koaxial hohl ausgebildet. Um bei diesem vollständig koaxial hohl ausgebildeten Raumformen eine hinreichende Bauteilsteifigkeit und Bauteilfestigkeit zu erzielen, beträgt die verbleibende Wandstärke jeweils etwa ein Fünftel des Durchmessers.After DE3120834 is an internally mounted on a housing pin integral crankshaft coaxially hollow. After EP1355764 is an externally mounted one-piece crankshaft completely coaxially hollow. In order to achieve a sufficient component rigidity and component strength in this completely coaxial hollow-shaped spatial forms, the remaining wall thickness is in each case about one fifth of the diameter.

Die Aufgabe besteht in der Verringerung der Maschinenmasse durch eine hohle, hinreichend steife und feste Kurbelwelle.The task is to reduce the engine mass by a hollow, sufficiently stiff and strong crankshaft.

Die Aufgabe wird im Wesentlichen durch die Merkmale des Anspruchs 1 gelöst. Vorteilhafte Weiterbildungen ergeben sich aus den Unteransprüchen.The object is essentially achieved by the features of claim 1. Advantageous developments emerge from the subclaims.

So weist eine Handwerkzeugmaschine ein Kurbelgetriebe mit einer Pleuelstange und eine, die Pleuelstange an einem Kurbelzapfen lagernde, axial drehbaren Kurbelwelle auf, die koaxial hohl ausgebildet und axial beidseitig geschlossen ist. Ein den Kurbelzapfen tragender Kurbelteller ist hohl ausgebildet, wodurch die Bauteilmasse der Kurbelwelle weiter verringert wird.Thus, a hand tool machine has a crank mechanism with a connecting rod and a, the connecting rod on a crank pin overlapping, axially rotatable crankshaft, which is coaxially hollow and axially closed on both sides. A crank pin bearing crank pin is hollow, whereby the component mass of the crankshaft is further reduced.

Durch die Ausbildung der Kurbelwelle als koaxial hohle, jedoch axial beidseitig geschlossene Raumform bildet diese eine dreidimensional geschlossene Oberfläche aus (topologisch ähnlich einer Kugeloberfläche). Dadurch wird im Vergleich zu den (topologisch) zweifach axial offenen Raumformen bei gegebenem Material, gegebener Wandstärke und (bis auf den axialen Abschluss) gegebener Raumform eine wesentliche Steigerung der Bauteilsteifigkeit und Bauteilfestigkeit erzielt, bzw. eine Verringerung der Wandstärke und somit der Bauteilmasse ermöglicht. Dies trägt zur Verringerung der Maschinenmasse bei.Due to the design of the crankshaft as a coaxial hollow, but axially closed on both sides spatial form this forms a three-dimensionally closed surface (topologically similar to a spherical surface). As a result, a substantial increase in component rigidity and component strength is achieved in comparison to the (topologically) two-fold axially open spatial forms given a given material, given wall thickness and (except for the axial termination) given spatial form, or a reduction of the wall thickness and thus of the component mass is made possible. This contributes to the reduction of the engine mass.

Vorteilhaft ist die Kurbelwelle zweiteilig ausgebildet, insbesondere ist an dem zum Kurbelzapfen gegenüberliegenden axialen Ende ein Pfropfen vorhanden, welcher die ansonsten (topologisch) einfache offene Raumform der restlichen Kurbelwelle verschliesst, wodurch sich letztere durch Innenhochdruckumformen (engl. Hydroforming) kostengünstig und technologisch einfach herstellen lässt.Advantageously, the crankshaft is formed in two parts, in particular at the opposite axial end to the crank pin a plug is present, which closes the otherwise (topologically) simple open space form of the remaining crankshaft, whereby the latter by hydroforming (English hydroforming) can be produced inexpensively and technologically simple ,

Vorteilhaft beträgt die Wandstärke der restlichen Kurbelwelle (bis auf den Pfropfen) weniger als ein Zehntel des zugeordneten Wellendurchmessers, wodurch die Bauteilmasse der Kurbelwelle weiter verringert wird.Advantageously, the wall thickness of the remaining crankshaft (except for the plug) is less than one tenth of the associated shaft diameter, whereby the component mass of the crankshaft is further reduced.

Vorteilhaft ist der Kurbelzapfen selbst hohl ausgebildet, wodurch die Bauteilmasse und Exzentrizität der Kurbelwelle weiter verringert wird.Advantageously, the crank pin itself is hollow, whereby the component mass and eccentricity of the crankshaft is further reduced.

Vorteilhaft sind auf der Kurbelwelle zwei zylindrische Lagerführungen ausgebildet, denen weiter vorteilhaft jeweils ein Axialanschlag zugeordnet ist, wodurch (über je ein zugeordnetes Radiallager) eine aussengeführte Lagerung im Gehäuse unterstützt wird.Advantageously, two cylindrical bearing guides are formed on the crankshaft, each of which is advantageously associated with an axial stop, whereby (via one associated radial bearing) an externally guided bearing in the housing is supported.

Vorteilhaft ist die Kurbelwelle axial zwischen den Lagerführungen radial verjüngt, wodurch die Bauteilmasse der Kurbelwelle minimiert wird.Advantageously, the crankshaft is radially tapered axially between the bearing guides, whereby the component mass of the crankshaft is minimized.

Die Erfindung wird bezüglich eines vorteilhaften Ausführungsbeispiels näher erläutert mit:

  • Fig. 1 als Handwerkzeugmaschine
  • Fig. 2 als Kurbelwelle
The invention will be explained in more detail with respect to an advantageous embodiment with:
  • Fig. 1 as a hand tool machine
  • Fig. 2 as a crankshaft

Nach Fig. 1 weist eine drehende und schlagende Handwerkzeugmaschine 1 in Form eines Kombihammers ein Kurbelgetriebe 2 zur Umsetzung der Rotationsbewegung eines Läufers 13 des Elektromotors 14 in eine Hin- und Herbewegung zum Antrieb des Erregerkolbens 3 auf, der über eine Luftfeder 4 den Schagkolben 5 antreibt, der über einen Döpper 6 den Schlag auf ein Werkzeug 7 in Form eines Bohrmeissels erzeugt. Das Kurbelgetriebe 2 weist eine Pleuelstange 8 und eine, diese über einen exzentrischen Kurbelzapfen 9 antreibende, axial drehbaren Kurbelwelle 10 auf, die in einem Radiallager 11 im Gehäuse 12 geführt ist.To Fig. 1 a rotary and beating hand tool 1 in the form of a combihammer a crank gear 2 for converting the rotational movement of a rotor 13 of the electric motor 14 in a reciprocating motion to drive the exciter piston 3, which drives the latching piston 5 via an air spring 4, via a Anvil 6 generates the impact on a tool 7 in the form of a drill bit. The crank mechanism 2 has a connecting rod 8 and a, this via an eccentric crank pin 9 driving, axially rotatable crankshaft 10, which is guided in a radial bearing 11 in the housing 12.

Nach Fig. 2 ist die zweiteilig ausgebildete Kurbelwelle 10 bezüglich einer Kurbelachse A koaxial hohl ausgebildet und axial beidseitig geschlossen, wobei an dem zum Kurbelzapfen 9 gegenüberliegenden axialen Ende ein Pfropfen 15 vorhanden ist, welcher die ansonsten einfach offene Raumform der restlichen Kurbelwelle 10 verschliesst. Die restliche Kurbelwelle 10 ist dabei durch Innenhochdruckumformen aus einem rohrförmigen Rohling (nicht dargestellt) aus einer Aluminiumlegierung hergestellt. Die Wandstärke W dieser restlichen Kurbelwelle 10 beträgt weniger als ein Zehntel des zugeordneten Wellendurchmessers D. Zudem ist der Kurbelzapfen 9 sowie ein diesen tragender Kurbelteller 16 selbst hohl ausgebildet. Auf der Kurbelwelle 10 sind zwei axial beabstandete zylindrische Lagerführungen 17 für Radiallager 11 (Fig. 1) ausgebildet, denen jeweils ein Axialanschlag 18 zugeordnet ist. Die Kurbelwelle 10 ist axial zwischen den Lagerführungen 17 radial verjüngt.To Fig. 2 is the two-part formed crankshaft 10 with respect to a crank axis A coaxially hollow and axially closed on both sides, wherein at the opposite axial end to the crank pin 9, a plug 15 is present, which closes the otherwise simple open space shape of the remaining crankshaft 10. The remaining crankshaft 10 is made by hydroforming from a tubular blank (not shown) made of an aluminum alloy. The wall thickness W of this remaining crankshaft 10 is less than one-tenth of the associated shaft diameter D. In addition, the crank pin 9 and a crank plate 16 carrying this itself is hollow. On the crankshaft 10 are two axially spaced cylindrical bearing guides 17 for radial bearings 11 (FIGS. Fig. 1 ), each associated with an axial stop 18. The crankshaft 10 is radially tapered axially between the bearing guides 17.

Claims (8)

  1. A hand-held power tool comprising a crank mechanism (2) with a connecting rod (8) and an axially rotatable crankshaft (10) supporting the connecting rod (8) on a crank pin (9), the crankshaft (10) being coaxially hollow and the crankshaft (10) being axially closed on both sides, characterised in that a crank disc (15) bearing the crank pin (9) is hollow.
  2. Hand-held power tool according to claim 1, characterised in that the crankshaft (10) is formed in two parts.
  3. Hand-held power tool according to claim 2, characterised in that a plug (15) is provided at the axial end of the crankshaft (10) opposite the crank pin (9) and closes the remaining part of the crankshaft (10) which would otherwise simply be open.
  4. Hand-held power tool according to one of claims 1 to 3, characterised in that the wall thickness (W) of the hollow crankshaft (10) is less than one teeth of the associated shaft diameter (D).
  5. Hand-held power tool according to one of claims 1 to 4, characterised in that the crank pin (9) itself is hollow.
  6. Hand-held power tool according to one of claims 1 to 4, characterised in that two cylindrical bearing guides (17) are provided on the crankshaft (10).
  7. Hand-held power tool according to claim 6, characterised in that an axial stop (18) is associated with the bearing guide (17).
  8. Hand-held power tool according to claim 6 or claim 7, characterised in that the crankshaft (10) is radially tapered axially between the bearing guides (17).
EP08105405A 2007-10-08 2008-09-23 Manual machine tool with a crank drive Not-in-force EP2047951B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102007000827A DE102007000827A1 (en) 2007-10-08 2007-10-08 Hand tool with a crank mechanism

Publications (2)

Publication Number Publication Date
EP2047951A1 EP2047951A1 (en) 2009-04-15
EP2047951B1 true EP2047951B1 (en) 2010-11-17

Family

ID=40219278

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08105405A Not-in-force EP2047951B1 (en) 2007-10-08 2008-09-23 Manual machine tool with a crank drive

Country Status (3)

Country Link
EP (1) EP2047951B1 (en)
AT (1) ATE488330T1 (en)
DE (2) DE102007000827A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITPN20110067A1 (en) * 2011-10-11 2013-04-12 Giovanni Zago DRILLING EQUIPMENT-PLURI-CYLINDRICAL DEMOLITION FOR ELECTRO-PNEUMATIC ACTION

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191224090A (en) * 1912-10-22 1913-12-22 Electric Hammers Ltd Improvements in Power Operated Portable Hammers for use with Percussive Tools for Rivetting, Caulking, Chipping and the like.
DE2335924A1 (en) * 1973-07-14 1975-02-06 Bosch Gmbh Robert Portable power tool with operating hours indicator - has wearing pin spring-loaded against rotary slipring
DE3120834A1 (en) 1981-05-26 1982-12-16 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Pneumatically working drilling hammer
DE3910599C2 (en) 1989-04-01 1994-11-17 Bosch Gmbh Robert Lubrication device for a hammer drill and / or hammer
DE4227288A1 (en) * 1992-08-18 1994-02-24 Bosch Gmbh Robert Hammer drill
DE10103996C1 (en) 2001-01-30 2002-10-02 Wacker Werke Kg Air spring hammer mechanism for a hammer and / or hammer drill with a short piston

Also Published As

Publication number Publication date
DE502008001811D1 (en) 2010-12-30
EP2047951A1 (en) 2009-04-15
DE102007000827A1 (en) 2009-04-09
ATE488330T1 (en) 2010-12-15

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