EP1864760A2 - Machine-outil manuelle dotée d'un mécanisme de percussion pneumatique entraîné par manivelle - Google Patents

Machine-outil manuelle dotée d'un mécanisme de percussion pneumatique entraîné par manivelle Download PDF

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Publication number
EP1864760A2
EP1864760A2 EP07109179A EP07109179A EP1864760A2 EP 1864760 A2 EP1864760 A2 EP 1864760A2 EP 07109179 A EP07109179 A EP 07109179A EP 07109179 A EP07109179 A EP 07109179A EP 1864760 A2 EP1864760 A2 EP 1864760A2
Authority
EP
European Patent Office
Prior art keywords
eccentric
crank
hand tool
range
mass
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.)
Withdrawn
Application number
EP07109179A
Other languages
German (de)
English (en)
Other versions
EP1864760A3 (fr
Inventor
Reinhard Schulz
Stefan Hammerstingl
Damir Cehajic
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 EP1864760A2 publication Critical patent/EP1864760A2/fr
Publication of EP1864760A3 publication Critical patent/EP1864760A3/fr
Withdrawn legal-status Critical Current

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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
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D17/24—Damping the reaction force
    • 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
    • B25D2217/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D2217/0073—Arrangements for damping of the reaction force
    • B25D2217/0076—Arrangements for damping of the reaction force by use of counterweights
    • B25D2217/0088—Arrangements for damping of the reaction force by use of counterweights being mechanically-driven
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/245—Spatial arrangement of components of the tool relative to each other

Definitions

  • the invention refers to a hand tool with a crank-driven air spring impact mechanism, in particular a combination hammer or chisel hammer.
  • a conventional such hand tool has after the DE2511083 a driven by an electric motor crank gear with a mirror symmetry unbalanced to the crank radius eccentric, which reciprocates a percussion piston oscillating about an air spring, which strikes directly on a percussion tool.
  • the vibration can theoretically be compensated to zero with practically corresponding counter-phase counter forces, practically only in part.
  • this can be achieved by a sufficiently large number of harmonic countervibrations of different frequency, amplitude and phase, if they are chosen according to out-of-phase for Fourier decomposition of the vibration.
  • the object of the invention is the structurally simple realization of an active vibration reduction for a hand tool with a crank-driven air spring impact mechanism.
  • a hand-held power tool has an air spring impact mechanism suitable for producing axial impacts of a percussion hammer reciprocating piston, which is driven via a crank pin of a rotatably mounted eccentric whose mass distribution has an imbalance with respect to an eccentric axis which is in the eccentric plane perpendicular to the eccentric axis offset by an unbalance angle to the crank pin spaced in the crank radius, which lies in the direction of rotation in the range of 70 ° to 90 °.
  • the imbalance related to the crank radius and the aircraft piston mass is in the range of 0.3 to 1.0, whereby the imbalance is suitably dimensioned
  • the unbalance related to the crank radius and the aircraft piston mass is advantageously in the range from 0.4 to 1.0.
  • the imbalance related to the crank radius and the aircraft piston mass is in the range of 0.35 to 0.9.
  • the imbalance related to the crank radius and the aircraft piston mass is in the range of 0.3 to 0.8.
  • crankshaft journal along the eccentric axis directly adjacent crank disc with a non-rotationally symmetrical in the eccentric mass distribution, which is not mirror-symmetrical with respect to the (vectorial) crank radius, whereby an eccentric arranged close to the impact axis with this imbalance only low tilting moments generated.
  • a shaped eccentric can be easily produced by a casting or forging process.
  • the eccentric multi-part design and an eccentric shaft with the crank disc (9, 9 ') or, further advantageously designed as an eccentric ring, additional mass (11) is firmly connected, whereby the eccentric of geometrically simple components can be assembled.
  • a rotary hammers hand tool 1 an axial blows of a striking axis A reciprocating percussion piston 2 on a percussion tool 12 exporting air spring impactor 3, wherein on a molded from the outer housing 7 handle 8, a slight vibration V occurs, the (in generally temporally periodically) is oriented obliquely to the impact axis A.
  • the exciting the air spring impactor 3, along the striking axis A reciprocating excitation piston 13 is connected via a connecting rod 14 with a crank radius K spaced crank pin 4 of an eccentric E rotating in a bearing 15 mounted eccentric 5, which via a pinion 16 of an electric motor 6 is driven.
  • the eccentric 5 has along the eccentric axis E a crankshaft 4 directly adjacent crankshaft 9, which is fixedly connected to an eccentric shaft 10.
  • the crank disk 9 shown in the eccentric plane oriented perpendicular to the eccentric axis E and fixedly connected to the eccentric shaft 10 has a non-rotationally symmetrical contour and corresponding mass distribution which is not mirror-symmetrical with respect to the crank radius K directed to the crank pin 4 (vectorially) the eccentric 5 forms a resultant imbalance U (which is physically equivalent to a point of mass of the eccentric 5 otherwise considered as massless in the amount of the crank radius K) which is offset by an imbalance angle [phi] of 80 ° to the (vectorially) directed crank radius K Crank pin 4 is offset.
  • the additional mass 11 designed as an eccentric ring has a contour which is not rotationally symmetrical in the eccentric plane to the eccentric shaft 10 and corresponding mass distribution which is not mirror-symmetrical with respect to the crank pin 4 'directed (vectorial) crank radius K, whereby the eccentric 5'. forming a resulting imbalance U (which is physically equivalent to a mass point of the otherwise otherwise considered eccentric 5 ') which is deflected by an imbalance angle [phi] of 80 ° to the (vectorially) crank radius K to the crank pin 4'. is offset.
  • the eccentric 5 ' is with the Crankshaft 5 'and the additional mass 11 formed in several parts and connected via a press fit with tongue and groove fit firmly with the eccentric shaft 10.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
EP07109179A 2006-06-08 2007-05-30 Machine-outil manuelle dotée d'un mécanisme de percussion pneumatique entraîné par manivelle Withdrawn EP1864760A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102006000279A DE102006000279A1 (de) 2006-06-08 2006-06-08 Handwerkzeugmaschine mit kurbelgetriebenem Luftfederschlagwerk

Publications (2)

Publication Number Publication Date
EP1864760A2 true EP1864760A2 (fr) 2007-12-12
EP1864760A3 EP1864760A3 (fr) 2013-01-09

Family

ID=38543732

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07109179A Withdrawn EP1864760A3 (fr) 2006-06-08 2007-05-30 Machine-outil manuelle dotée d'un mécanisme de percussion pneumatique entraîné par manivelle

Country Status (4)

Country Link
US (1) US20080047720A1 (fr)
EP (1) EP1864760A3 (fr)
JP (1) JP2007326215A (fr)
DE (1) DE102006000279A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011035955A1 (fr) * 2009-09-24 2011-03-31 Robert Bosch Gmbh Outil électrique comprenant un ensemble de percussion et une masse d'équilibrage pour la compensation des vibrations de l'outil électrique

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007037043A1 (de) * 2007-08-06 2009-02-12 Robert Bosch Gmbh Zusatzhandgriffvorrichtung
KR101159587B1 (ko) * 2009-05-26 2012-06-26 현대제철 주식회사 슈트용 고착물 제거장치
DE202010017883U1 (de) * 2010-12-21 2013-02-08 Robert Bosch Gmbh Handwerkzeugmaschine
JP7624319B2 (ja) * 2021-02-04 2025-01-30 株式会社マキタ 打撃工具

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3305031A (en) * 1965-02-01 1967-02-21 Ingersoll Rand Co Power hammer
US4318446A (en) * 1978-10-10 1982-03-09 Caterpillar Tractor Co. Linear motion impactor device
US4509378A (en) * 1983-02-22 1985-04-09 Brown Arthur E Reciprocating machines with both primary and secondary counter rotating balancers
SU1617139A1 (ru) * 1988-08-09 1990-12-30 Московское Научно-Производственное Объединение По Механизированному Строительному Инструменту И Отделочным Машинам Компрессионно-вакуумна машина ударного действи
DE4415348A1 (de) * 1994-05-02 1995-11-09 Hilti Ag Bohr- und Meisselgerät
DE10034359A1 (de) * 2000-07-14 2002-01-24 Hilti Ag Schlagendes Elektrohandwerkzeuggerät
GB0100605D0 (en) * 2001-01-10 2001-02-21 Black & Decker Inc Hammer
ATE467487T1 (de) * 2003-03-21 2010-05-15 Black & Decker Inc Schwingungsreduziervorrichtung für kraftbetriebenes werkzeug und solch eine vorrichtung enthaltendes kraftbetriebenes werkzeug
DE202004020770U1 (de) * 2003-03-21 2006-01-05 Black & Decker Inc., Newark Schwingungsverringerungsvorrichtung für ein angetriebenes Werkzeug und angetriebenes Werkzeug mit einer solchen Vorrichtung
DE10358033B4 (de) * 2003-12-11 2007-05-03 Hilti Ag Antriebsanordnung
JP2008012664A (ja) * 2006-07-01 2008-01-24 Black & Decker Inc ハンマードリル用の潤滑油ポンプ

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011035955A1 (fr) * 2009-09-24 2011-03-31 Robert Bosch Gmbh Outil électrique comprenant un ensemble de percussion et une masse d'équilibrage pour la compensation des vibrations de l'outil électrique
CN102510791A (zh) * 2009-09-24 2012-06-20 罗伯特·博世有限公司 具有冲击机构组件和用于补偿电动工具的振动的平衡质量的电动工具
CN102510791B (zh) * 2009-09-24 2015-06-03 罗伯特·博世有限公司 具有冲击机构组件和用于补偿电动工具的振动的平衡质量的电动工具

Also Published As

Publication number Publication date
US20080047720A1 (en) 2008-02-28
DE102006000279A1 (de) 2007-12-13
EP1864760A3 (fr) 2013-01-09
JP2007326215A (ja) 2007-12-20

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