EP2105261A1 - Outil électrique, en particulier marteau perforateur et/ou burineur - Google Patents

Outil électrique, en particulier marteau perforateur et/ou burineur Download PDF

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Publication number
EP2105261A1
EP2105261A1 EP08005762A EP08005762A EP2105261A1 EP 2105261 A1 EP2105261 A1 EP 2105261A1 EP 08005762 A EP08005762 A EP 08005762A EP 08005762 A EP08005762 A EP 08005762A EP 2105261 A1 EP2105261 A1 EP 2105261A1
Authority
EP
European Patent Office
Prior art keywords
housing
capsule
tool
transmission
sound
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Withdrawn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
EP08005762A
Other languages
German (de)
English (en)
Inventor
Roland Vögele
Zbynek Kadlec
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.)
Techtronic Industries GmbH
Original Assignee
AEG Electric Tools GmbH
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 AEG Electric Tools GmbH filed Critical AEG Electric Tools GmbH
Priority to EP08005762A priority Critical patent/EP2105261A1/fr
Publication of EP2105261A1 publication Critical patent/EP2105261A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/006—Vibration damping means
    • 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
    • B25D17/11—Arrangements of noise-damping means
    • 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
    • B25D17/11—Arrangements of noise-damping means
    • B25D17/12—Arrangements of noise-damping means of exhaust silencers
    • 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
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/008—Cooling means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2222/00—Materials of the tool or the workpiece
    • B25D2222/54—Plastics
    • 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
    • B25D2250/121—Housing details

Definitions

  • the present invention relates to power tools and in particular drill and / or chisel hammer.
  • the present invention relates to power tools in which sound-reducing measures are to be taken to comply with regulations and regulations.
  • EU Regulation 2000/14 / EC which regulates the allowable noise emissions of equipment intended for outdoor use.
  • the object of the present invention is to develop a power tool of the type mentioned in such a way that the noise emission emanating from it is reduced without substantially increasing the weight and the manufacturing costs and impairing the external appearance.
  • the present invention is based on the idea of the area of a power tool in which the noise source generating the noise to be reduced is preferably completely surrounded by a sound-insulating or sound-insulating capsule, which is attached to the power tool via an elastic suspension in order to avoid structure-borne sound transmissions.
  • an inventive power tool which is in particular a drill and / or chisel hammer defined by a housing, a recorded in the housing drive, for.
  • a housing a recorded in the housing drive
  • an electric motor for generating a driving force
  • a tool holder for receiving a tool, such as a drill or bit, at one end of the housing and a housed in the housing gear for direct or indirect transmission of the driving force to the tool
  • at least one Noise source is located in the housing.
  • this noise source may be located, for example, at the point of impact between a striker and an anvil or the striker and the tool or between the striker and the tool and thus in the transmission housing.
  • the noise source may also be formed by a fan, for example for cooling the drive.
  • the power tools according to the invention are power tools in the weight class under 25 kg, but in particular to power tools in high weight classes of about 10-25 kg.
  • a sound-insulating or insulating capsule is provided according to the invention, which completely surrounds the housing at least in the region of at least one noise source. Complete here means that the capsule is located on both sides of the noise source in the longitudinal direction of the tool extends out and surrounds the housing circumferentially completely. Completely enclosing the housing at the axial ends is not mandatory.
  • the capsule according to the invention is attached to the housing via an elastic suspension or suspended elastically on the housing. This can be done, for example, that the attachment of the capsule on the housing is positively, wherein between the capsule and the housing elastic devices or suspensions, z. B. are provided from rubber. These elastic devices may, for. B. are formed by O-rings.
  • the capsule may be formed in one embodiment of a glass fiber reinforced polyamide, magnesium or aluminum of 5 mm thickness. With this configuration, it becomes possible to reduce the sound pressure and sound power level by a few dB (A) (for example, by 6 dB (A)) so that the required regulations and regulations can be maintained.
  • the electrical appliances according to the invention usually have a cooling device for cooling the drive (electric motor), for which purpose cooling air inlets and cooling air outlets are provided in the housing. Furthermore, a fan is generally provided on the drive to suck in the cooling air and to blow it through the housing or to flow.
  • a cooling air outlets are covered by the capsule. If outlets were formed in the capsule corresponding to the outflow openings in order to allow outflow of the cooling air, this would again reduce the abovementioned and achieved noise emission reduction, as a sound transmission could take place via the outlets.
  • a space is formed between the housing and the capsule into which the cooling air can flow out of the outflow openings of the housing. Subsequently, and after passing through a silencer, the cooling air can flow out of the capsule.
  • the outlet for the cooling air from the capsule is provided with a defined cross-section in order to achieve a sufficiently high air flow rate. This can avoid a significant reduction in engine performance and associated risk of overheating.
  • the housing usually consists of a gear housing, generally made of a metallic material, for. As aluminum or magnesium die-cast, and a drive or motor housing made of a plastic.
  • the at least one noise source may, as mentioned above, lie in the transmission housing. Since the transmission housing can transmit structure-borne noise, it is particularly preferred for the capsule to completely surround the transmission housing in the longitudinal direction or axial direction in order to counteract this structure-borne sound transmission via the transmission housing.
  • the capsule preferably extends beyond the tool holder and leaves only a relatively small sized opening for passage of the tool.
  • care must be taken to ensure that the tool holder for insertion and removal of the tool remains easily accessible or can be opened over the tool holder portion extending the capsule in a simple manner and closed or moved to grant access to the tool holder. With regard to the latter, simple and uncomplicated handling must be ensured.
  • the capsule has a sound-insulating material on its inner side facing the housing.
  • a sound-insulating material on its inner side facing the housing. This makes it possible to form the outside of the capsule facing away from the housing, for example, from a hard plastic, magnesium or aluminum, which can be configured with regard to the external appearance.
  • the design may possibly be modeled on the existing contour of the transmission housing.
  • the electric tool for flowing through the housing with cooling air in particular for cooling the electric motor, can have a fan which is provided in the housing.
  • the fan is advantageously also driven by the drive and may form the mentioned at least one noise source. Both by the flowing cooling air and by the fan itself or in the housing air noise, in particular whistling, be generated, which represent another source of noise.
  • the capsule surrounds the housing in the region of the fan.
  • a chisel hammer of the 20 kg class is described as a purely exemplary power tool. It is understood, however, that the present invention is not limited to such a power tool, but also to other power tools such. As angle grinder, saws, etc. is transferable.
  • Fig. 1 shown power tool comprises a two-part housing consisting of a motor housing 100 and a gear housing 110.
  • the gear housing 110 is made of a metallic material, here aluminum die casting, whereas the motor housing 100 is made of plastic.
  • a tool holder 120 is provided, in which a chisel is used as a tool 50 in the illustrated embodiment.
  • the motor housing 100 comprises handles in the form of the handles 101, 102.
  • cooling air inlets 103 are provided in the region of the front side of the motor housing 100, which faces away from the gear housing 110, through which cooling air for cooling the electric motor can flow.
  • the gear housing 110 also has slot-like cooling air outlets 112, through which the cooling air can flow out after cooling.
  • an electric motor is accommodated in the motor housing 100. This is how it looks Fig. 2 can be seen from a coil 30 and an armature shaft 31 together.
  • the armature shaft 31 is rotatably mounted in the motor housing 100 and has at its end facing the transmission, a fan 32 and a pinion 33.
  • the transmission is added.
  • This comprises on the one hand a ring gear 40, which is rotatably mounted in the gear housing 110 via an axle 42.
  • the ring gear 40 is engaged with the pinion 33 of the armature shaft 31 and is rotated by the rotation of the armature shaft.
  • Rotationally connected to the ring gear 40 is an eccentric 41, on the eccentric axis 44 is mounted.
  • This axis 44 is connected to a connecting rod 43, which in turn is connected via an axis 46 with a piston 45.
  • the piston 45 is guided in a cylinder 53, in which further a striker 48 is guided. Between the facing end faces of the piston 45 and the impactor 48, an air cushion 47 is formed.
  • the impactor 48 acts in operation on an anvil 49, which in turn acts on the bit 50.
  • the armature shaft 31 is rotated.
  • the eccentric 41 rotates, whereby the piston 45 is translated over the connecting rod 43 in the cylinder 53 translationally back and forth.
  • the air cushion 47 is compressed, so that the striker 48 strikes against the striker 49, which in turn strikes against the chisel 50 to produce the advancing movement of the chisel 50.
  • the return stroke of the piston 45 the return of the impactor 48 and the striker 49 takes place.
  • first noise source 51 and second noise source 52 Another source of noise, in the illustrated embodiment, is the fan 32.
  • a capsule 10 is provided according to the invention.
  • the capsule 10 is formed in the illustrated embodiment by a plastic housing 11 which is lined with an insulating material 12.
  • the insulating material is preferably a foam, for example with a foam thickness of 28 mm, preferably between 20 and 35 mm.
  • sound-insulating foam it is possible to use all sound-absorbing foams which withstand temperatures of at least 90 ° C. Examples of such foams are PUR esters or polyethylene.
  • the capsule 10 is designed with two shells and is screwed, for example.
  • the outside of the plastic housing Due to the configuration with a plastic housing 11 and an insulating material 12 on the inside, it is possible to provide the outside of the plastic housing with a desired external appearance, which is modeled, for example, the conventional outer contour of the gear housing 110.
  • the capsule 10 in one piece from a sound-absorbing foam, wherein, for example, the density of the foam on the outside is greatly increased. The latter can be achieved for example by a targeted heating of the foam in the outdoor area.
  • the capsule 10 completely surrounds the gear housing 110 in the axial direction and, moreover, extends completely beyond the tool holder 120.
  • an opening 22 is provided for the passage of the bit 50, which is to be kept as small as possible in their dimensions.
  • a fixation of the capsule 10 in the longitudinal direction (axial direction) of the power tool also takes place in a form-fitting manner.
  • a fixing device 13 is provided between the and the tool holder 120, the O-rings 15, 16 are interposed.
  • the capsule is clamped for fixing with the interposition of the O-ring 16 between the fixing device and a shoulder 121 of the tool holder 120. At the other end, the fixing device is supported via the O-ring 15 on a shoulder 111 of the transmission housing 110. A displacement of the capsule 10 in the longitudinal direction is therefore not possible.
  • the O-rings 15, 16, 17 are made of rubber, z. B. NBR formed.
  • the capsule consists of a glass fiber reinforced polyamide of 5 mm thickness, which corresponds approximately to the basis weight of a 1 mm thick steel sheet.
  • a cooling air space 18 is formed between the capsule 10 and the gear housing 110 at least in the region of thede Kunststoffausströmö réelle 112, which is dimensioned such that a sufficiently high air flow rate is possible. This allows the cooling air to flow out of the cooling air outflow ports 112 of the transmission case 110 into the space 18. Thereafter, the cooling air flows as indicated by the arrows KL in Fig. 2 is shown, further through a cooling air passage 19 and exits the capsule 10 via a muffler 17 through a cooling air outlet 21.
  • the cross section of the cooling air outlet 21 is also such defines that it is not too small and allows sufficient air flow so that engine power can be maintained without significant reduction, thus avoiding overheating.
  • the muffler 17 is also at least partially lined with the insulating material 12, which may be the same insulating material as described above.
  • a region 20 is formed, which functions similar to a Helmholtz resonator.
  • a Helmholtz resonator is an acoustic resonator consisting of a gas volume with a narrow opening 22 to the outside. The elasticity of the volume of air in the interior in combination with the inertial mass of the air in the opening creates a mechanical mass-spring system with a pronounced self-resonance. This makes it possible to reduce the sound pressure from low frequencies. In contrast, the muffler 17 makes it possible to eliminate high whistling frequencies of> 500 Hz.
  • the transitions between the motor housing 100, gear housing 110 and capsule 10 and between the capsule shells are airtight.
  • the O-rings 14-16 thus have a dual function in the sealing of the interface between the capsule 10 and the housing 100, 110 and the elastic suspension of the capsule 10th
  • the sound pressure and sound power level was reduced by 10 dB (A) in the illustrated chisel hammer and compared with a same chisel hammer without capsule 10 and eliminates all whistling noises.
  • the design of the capsule 10 of a plastic housing 11 with an insulation lining a desired predetermined appearance could be achieved by the design of the capsule 10 of a plastic housing 11 with an insulation lining a desired predetermined appearance.
  • the production is relatively cheap and the Weight gain by the capsule 10 is in a range below 8% of the original weight.
  • the present invention is not limited to the above described embodiment, but various modifications are conceivable.
  • the elastic suspension may be other than by the illustrated O-rings 14-16 are solved, such as springs or other elastic or resilient elements.
  • an integral embodiment of the capsule 10 of a sound-insulating material instead of the two-part configuration is conceivable.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
EP08005762A 2008-03-27 2008-03-27 Outil électrique, en particulier marteau perforateur et/ou burineur Withdrawn EP2105261A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08005762A EP2105261A1 (fr) 2008-03-27 2008-03-27 Outil électrique, en particulier marteau perforateur et/ou burineur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP08005762A EP2105261A1 (fr) 2008-03-27 2008-03-27 Outil électrique, en particulier marteau perforateur et/ou burineur

Publications (1)

Publication Number Publication Date
EP2105261A1 true EP2105261A1 (fr) 2009-09-30

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Application Number Title Priority Date Filing Date
EP08005762A Withdrawn EP2105261A1 (fr) 2008-03-27 2008-03-27 Outil électrique, en particulier marteau perforateur et/ou burineur

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EP (1) EP2105261A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2253430A1 (fr) * 2009-05-20 2010-11-24 Friedrich Duss Maschinenfabrik GmbH & Co. KG Machine-outil électrique, notamment perceuse manuelle
CN102597444A (zh) * 2009-12-02 2012-07-18 长年Tm公司 用于消除噪音和防冰控制的消音系统

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1300477B (de) * 1963-06-10 1969-07-31 Clarke Ronald Albert William Schalldaempfer fuer mit Gas betriebene Werkzeuge
EP0147262A1 (fr) * 1983-11-10 1985-07-03 CHARBONNAGES DE FRANCE, Etablissement public dit: Carter insonorisant pour marteau pneumatique de foration
EP0166681A1 (fr) * 1984-05-29 1986-01-02 SIG Schweizerische Industrie-Gesellschaft Marteau penumatique
DE19730356A1 (de) * 1997-07-15 1999-01-28 Wacker Werke Kg Aufbruch- und/oder Bohrhammer
EP0937548A1 (fr) * 1998-02-23 1999-08-25 Kress-elektrik GmbH + Co. Elektromotorenfabrik Outil à main et méthode de sa fabrication
US20010000882A1 (en) * 1999-10-01 2001-05-10 Giardino David A. Vibration isolated impact wrench
WO2004110701A1 (fr) * 2003-06-11 2004-12-23 Kuken Co., Ltd. Outil electrique a main et accessoire associe
EP1637288A1 (fr) * 2004-09-16 2006-03-22 HILTI Aktiengesellschaft Outil à main électrique amortissant les vibrations
EP1958735A1 (fr) * 2007-02-15 2008-08-20 HILTI Aktiengesellschaft Machine-outil

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1300477B (de) * 1963-06-10 1969-07-31 Clarke Ronald Albert William Schalldaempfer fuer mit Gas betriebene Werkzeuge
EP0147262A1 (fr) * 1983-11-10 1985-07-03 CHARBONNAGES DE FRANCE, Etablissement public dit: Carter insonorisant pour marteau pneumatique de foration
EP0166681A1 (fr) * 1984-05-29 1986-01-02 SIG Schweizerische Industrie-Gesellschaft Marteau penumatique
DE19730356A1 (de) * 1997-07-15 1999-01-28 Wacker Werke Kg Aufbruch- und/oder Bohrhammer
EP0937548A1 (fr) * 1998-02-23 1999-08-25 Kress-elektrik GmbH + Co. Elektromotorenfabrik Outil à main et méthode de sa fabrication
US20010000882A1 (en) * 1999-10-01 2001-05-10 Giardino David A. Vibration isolated impact wrench
WO2004110701A1 (fr) * 2003-06-11 2004-12-23 Kuken Co., Ltd. Outil electrique a main et accessoire associe
EP1637288A1 (fr) * 2004-09-16 2006-03-22 HILTI Aktiengesellschaft Outil à main électrique amortissant les vibrations
EP1958735A1 (fr) * 2007-02-15 2008-08-20 HILTI Aktiengesellschaft Machine-outil

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2253430A1 (fr) * 2009-05-20 2010-11-24 Friedrich Duss Maschinenfabrik GmbH & Co. KG Machine-outil électrique, notamment perceuse manuelle
CN102597444A (zh) * 2009-12-02 2012-07-18 长年Tm公司 用于消除噪音和防冰控制的消音系统
CN102597444B (zh) * 2009-12-02 2015-09-16 长年Tm公司 用于消除噪音和防冰控制的消音系统

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