EP2240296B1 - Handwerkzeugmaschine, insbesondere elektrisch betriebene handwerkzeugmaschine - Google Patents

Handwerkzeugmaschine, insbesondere elektrisch betriebene handwerkzeugmaschine Download PDF

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Publication number
EP2240296B1
EP2240296B1 EP08871343.3A EP08871343A EP2240296B1 EP 2240296 B1 EP2240296 B1 EP 2240296B1 EP 08871343 A EP08871343 A EP 08871343A EP 2240296 B1 EP2240296 B1 EP 2240296B1
Authority
EP
European Patent Office
Prior art keywords
damping element
power tool
portable power
housing
secondary damping
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.)
Active
Application number
EP08871343.3A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2240296A1 (de
Inventor
Joachim Schadow
Joerg Maute
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2240296A1 publication Critical patent/EP2240296A1/de
Application granted granted Critical
Publication of EP2240296B1 publication Critical patent/EP2240296B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/04—Portable grinding machines, e.g. hand-guided; Accessories therefor with oscillating grinding tools; Accessories therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B41/00—Component parts such as frames, beds, carriages, headstocks
    • B24B41/007—Weight compensation; Temperature compensation; Vibration damping
    • 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

Definitions

  • the invention relates to a hand tool, in particular an electrically operated hand tool, according to the preamble of claim 1.
  • the oscillating drive produces vibrations which contribute to the development of noise and, in particular, represent a mechanical load on the components of the power tool. It is therefore desirable to reduce the vibrations by suitable measures such as the use of damping elements. It is important to ensure that the damping measures are effective over a long service life.
  • the DE 10 2007 027 489 A1 which forms the basis for the preamble of claim 1, shows a hand tool with a first housing part and a second housing part, between which a damping element is arranged, which are the two Casing parts together.
  • a damping element is arranged, which are the two Casing parts together.
  • the rear housing part forms a handle for guiding the power tool. Due to the intermediate damping element there is a vibration decoupling between the housing parts.
  • This vibration decoupling according to the embodiment according to Fig. 6 be achieved via a damping arrangement in which the housing parts are held together by a primary damping element which engages over the mutually facing ends of the housing parts and lying between the housing parts gap.
  • a primary damping element is a locking element with damping function, a leaf spring element with meandering wavy, gap-spanning legs embedded, which forms a secondary damping element due to its damping properties.
  • a vibration damped handle which can be connected via a coupling element with the housing of a hand tool.
  • the handle has a grip sleeve, which is connected via a spring washer with the coupling element.
  • the spring washer can transmit forces both in the axial direction and in the radial direction.
  • the DE 10 2005 061 870 A1 shows a hand tool with two housing shells, which are connected to each other via two different damping means.
  • the first damping means is located between the inner wall of the upper side of the upper housing shell and a portion of the lower housing shell adjacent to the inner wall.
  • the second damping means is disposed on the approximately cylindrical outer wall of the housing between the housing shells and surrounds the second housing shell.
  • the damping means are active in each operating state of the power tool and damp vibrations between the housing shells.
  • a vibration decoupling connection between a central, housed housing and a received therein pneumatic drive motor is from the US 4,905,772 known.
  • the motor is in this case added with its cylindrical housing in a supporting skeleton, which has to the opposite end faces of the cylindrical motor housing surrounding support rings and a support ring axially connecting web.
  • This consisting of elastic material supporting skeleton of the motor is supported in a cylindrical receptacle of the housing via a provided for supporting skeleton sleeve-like sheath of damping material and fixed in a predetermined mounting position.
  • the invention has for its object to effectively reduce vibrations in a hand tool over a long period of operation with simple measures.
  • the hand tool according to the invention which is in particular an electrically operated hand tool, for example an angle grinder, has in a housing a drive unit which drives a tool via a drive connection.
  • the housing of the power tool is constructed in two parts and comprises two separate housing parts, between which a primary damping element is arranged, leading to an effective vibration damping or reduction between the housing parts and thus in the contributes to the entire hand tool.
  • the drive unit and the drive shaft with the tool accommodated thereon are arranged in the front housing part, whereas the rear housing part is designed as a grip, in which the electronics is accommodated and actuation switches are arranged.
  • the primary damping element both the vibrations are damped, which emanate from the drive unit, as well as the vibrations caused by the operation of the tool.
  • vibrations generated by eccentric drive such as unbalance vibrations are reduced via the primary damping element, but also vibrations in the machine tool.
  • the vibration load acting on a handle in the rear housing part is considerably reduced.
  • the primary damping element also has a force-transmitting function and holds the two housing parts together.
  • a secondary damping element is arranged between the two housing parts of the power tool in parallel to the primary damping element.
  • This secondary damping element is at least approximately free of forces at regular function of the primary damping element and only comes into operation when the primary damping element is deformed beyond a defined level. In such a deformation also changes according to the relative position between the two housing parts, whereupon the secondary damping element comes into operation and can develop its damping effect. In this way, a graded, hierarchical operation is achieved: With intact primary damping element or loads on the hand tool below a threshold, the damping takes place exclusively on the primary damping element.
  • the secondary damping element becomes effective. In this way, an effective vibration damping is ensured over a long period of operation of the power tool. Overall, the potential operating period extended because intact primary damping element, the vibrations are damped by this and in this time the secondary damping element is not subjected to stress. The secondary damping element is therefore subject to no or only a delayed aging and can also develop its function after a failure of the primary damping element.
  • the secondary damping element cooperates with a securing part, which bridges the two housing parts.
  • the securing part can be formed in particular in such a way that higher forces between the housing parts can be transmitted.
  • Securing part and secondary damping element can be optimized with respect to their different tasks.
  • the securing part is fixed to one housing part and loosely connected to the other housing part via the secondary damping element.
  • This is done, for example, by providing a bolt-receiving connection device in the area of the loose connection, in which a bolt, for example on the housing part, engages in a receptacle on the securing part, the secondary damping element at least partially embracing the bolt, for example in one embodiment as a damping ring, which is held either in the receptacle or on the bolt.
  • the bolt projects loosely into the receptacle and is only connected to the receptacle via the secondary damping element.
  • the secondary damping element can be designed as an independent component which is arranged or held on the securing part-possibly also on one of the housing parts.
  • the secondary damping element is integrated into the securing part, in which case both an insertion of the secondary damping element designed as an independent component into the securing part is possible, as well as a one-piece or one-piece embodiment of the secondary damping part with the securing part, especially with special structural design of the security part.
  • the securing part has, for example, a section with a wave or bellows shape; This section forms the secondary damping element, which can undergo a length expansion or - compression in a corresponding application of force, wherein the damping takes place via the internal damping of the material of the security part.
  • the secondary damping element can either consist of known damping materials such as elastomers, thermoplastics, thermosets, TPE or other plastics. It is also possible to use a knit design which consists for example of metal, plastic or other materials, where appropriate knitted fabrics are used with different material pairings. Finally, liquid or semi-liquid or viscous media are also suitable, for example silicone, gel, grease or oil. Gaseous media for the secondary damping element are also possible. The liquid or gaseous media have the advantage that the damping properties can be easily influenced or adjusted on the one hand by the pressure of the fluid and on the other hand by the choice of the viscosity of the fluid.
  • secondary damping element in the material of the Securing part for example, executions as wire rope, carbon fiber, coil spring or the like into consideration.
  • the integration into the securing part is carried out either by subsequent attachment of the secondary damping element to the securing part, for example by clamping in recesses or approaches of the security part or fastening using conventional fastening techniques, or even during the production of the security part, for example by encapsulation with the material of the security part or a other material.
  • the secondary damping element is embedded for this purpose, for example, as an insert in the mold of the security part.
  • an encapsulation after completion of the security part, wherein via the injection process, a connection to the security part is achieved.
  • a further, suitable combination of securing part and secondary damping element provides that the securing part is designed as a wire rope and the secondary damping element as pulled over the wire rope hose.
  • the hose has the desired damping properties
  • the wire rope is suitable for power transmission.
  • the combination of securing part and secondary damping element is formed deformable and can therefore be adapted to different geometries in the power tool. In principle, however, it is also possible to provide a inherently stiff secondary damping element which nevertheless has damping properties due to its geometry and / or its material.
  • Hand tool 1 shown for example, an electrically driven angle grinder, comprises a multi-part housing 2, which consists of a front, shell-shaped housing part 3, which forms a motor housing, and a rear shell-shaped housing part 4, which forms a handle housing 4.
  • the housing 2 is also associated with a transmission housing 19, which adjoins the front housing part 3.
  • the two housing parts 3 and 4 are connected via a primary damping element 5 with each other, wherein the primary damping element 5 performs both a force transmitting, the two housing parts 3 and 4 cohesive function as well as a vibration damping function.
  • an electric drive motor 6 is provided in the motor housing 2, which - only symbolically registered - drives a drive shaft 8 in the gear housing 19 via a drive connection 7, to which a tool 9 is releasably attached.
  • an electronics 20 for controlling or controlling the drive motor is arranged in the rear housing part 4.
  • a securing part 10 is provided inside the housing, which is arranged to act in parallel to the primary damping element 5 and connects the two housing parts 3 and 4 with each other.
  • the securing part 10 engages over the primary damping element 5, which bridges a gap separating the two housing parts 3 and 4.
  • the securing part 10 is positively connected, for this purpose 10
  • FormQueryausEnglishept 11 are placed in the securing part, which are placed on corresponding form-fitting elevations, which are formed on the rear housing part 4.
  • the securing part 10 has a recess 12 into which a one-piece with the front housing part 3 formed bolt 13 protrudes.
  • a secondary damping element 14 is arranged, which consists for example of a soft damping material.
  • the secondary damping element 14 may be connected to the securing part 10 and / or to the bolt 13.
  • the secondary damping element 14 is designed as a damping ring, which is arranged in the intermediate space between the outer jacket of the bolt 13 and the inner wall of the recess 12 in the securing part 10.
  • the secondary damping element 14 consists of two concentric rings of different diameters, which are connected to each other via radially extending webs and between which, separated by the webs, distributed over the circumference a plurality of chambers are formed.
  • the secondary damping element 14 is expediently held on the recess 12 limiting wall of the security part.
  • the inner ring of the secondary damping element 14 is seated on contact on the lateral surface of the bolt 13.
  • the secondary damping element 14 is also annular. It has a central recess which is bounded by inwardly directed nubs or teeth of the secondary damping element. In this central recess of the bolt 13 projects, wherein the relative positioning between the bolt and the secondary damping element takes place either in such a way that the lateral surface of the bolt is in contact with the inwardly directed nubs or, according to another Execution, in such a way that between the knobs and the bolt is an air gap.
  • Fig. 5 largely corresponds to the one after Fig. 1 , so that reference is made to the local description with respect to the matching structure.
  • the outer diameter of the secondary damping element 14 is smaller than the inner diameter of the recess 12 in the securing part 10, so that there is an air gap between the secondary damping element and the inside of the recess.
  • the secondary damping element 14 is pushed onto the bolt 13.
  • each securing part is assigned a secondary damping element, it being possible for a common secondary damping element to be provided for both lateral securing parts, and this common secondary damping element extends transversely across the width of the housing.
  • secondary damping element 14 has a central recess for pushing on a bolt and is provided with radially outwardly directed teeth or nubs.
  • an effective damping between the housing parts is also achieved, which is effective only when the primary damping element is disabled.
  • the secondary damping element 14 situated in the front region can be additionally provided; if necessary, this front secondary damping element can also be dispensed with.
  • Fig. 8 is a portion 10a of the securing part 10 structurally or geometrically designed in such a way that at a relative displacement in the longitudinal direction between the two housing parts 3 and 4, the securing member 10 can stretch in this section 10a or can be compressed.
  • Fig. 9 is exemplified by the fact that in this section 10a, the material of the securing part 10 is wave-shaped or bellows-shaped, so that in this area lower forces are sufficient to achieve elongation or compression.
  • Fig. 8 can be seen further, in this area 10a also provided a recess to further weaken the security part at this point.
  • the portion 10a of the security part assumes the function of a secondary damping element. Vibrations acting in the longitudinal direction of the hand tool machine cause an expansion or compression in the section 10a; additional damping is achieved by the internal damping of the material of the securing part.
  • the security part 10 is formed as a steel strip or steel cable, on which a hose 16 is mounted, which takes over the function of the secondary damping element.
  • the securing part 10 including tube 16 is formed deformable.
  • the securing part 10 is looped to a two elevations 17 in the front housing part 3 and attached to the other on a projection 18 in the rear housing part 4.
  • the security part is designed as a steel cable on which a hose 16 is mounted.
  • the tube 16 is not freely deformable, but carried out essentially self-supporting. It can be any shapes or geometries for the hose and the wire rope be given, which is given by a waveform of the hose 16, an additional strain or compression travel, which serves to damp the vibration.
  • a total of four annular secondary damping elements 14 are provided, which are effective between the securing part 10 and the bolt 13 on the second front housing part 3.
  • the four secondary damping elements 14 annularly surround the bolt 13, which is arranged on the front housing part 3.
  • a rope can be used or a suitably shaped molded part.
  • the damping elements can be positioned regularly or irregularly.
  • the secondary damping element 14 is arranged in the recess 12 in the securing part 10 and surrounds the bolt 13 in an annular manner.
  • the secondary damping element 14 is designed as an elastomeric strip which is guided along the inner wall of the recess 12 along and through bores which are introduced into the wall which delimits the recess 12.
  • each recess 11 in the rear region of the security part 10 secondary damping elements 14 is introduced, which in the in Fig. 15 illustrated manner are formed.
  • Each secondary damping element 14 has a tube shape and is brought by axial compression in a bulbous shape, whereby a bias voltage and thus influencing the damping properties is achieved.
  • a plurality of individual securing parts 10 are provided, which are formed for example as carbon fibers, shaped coil springs or wire ropes and are attached directly to the two housing parts 3 and 4.
  • the securing parts 10 can additionally of the Material of the primary damping element 5 to be encapsulated.
  • the securing parts 10 also have vibration damping properties, which is achieved by the geometry of the securing parts. In particular, in the form of a spiral spring or as a bellows-shaped, corrugated component, the securing parts 10 have elongation properties, damping being achieved via the inherent damping of the material.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Vibration Prevention Devices (AREA)
EP08871343.3A 2008-01-25 2008-11-11 Handwerkzeugmaschine, insbesondere elektrisch betriebene handwerkzeugmaschine Active EP2240296B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008006030A DE102008006030A1 (de) 2008-01-25 2008-01-25 Handwerkzeugmaschine, insbesondere elektrisch betriebene Handwerkzeugmaschine
PCT/EP2008/065308 WO2009092468A1 (de) 2008-01-25 2008-11-11 Handwerkzeugmaschine, insbesondere elektrisch betriebene handwerkzeugmaschine

Publications (2)

Publication Number Publication Date
EP2240296A1 EP2240296A1 (de) 2010-10-20
EP2240296B1 true EP2240296B1 (de) 2015-08-12

Family

ID=40361432

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08871343.3A Active EP2240296B1 (de) 2008-01-25 2008-11-11 Handwerkzeugmaschine, insbesondere elektrisch betriebene handwerkzeugmaschine

Country Status (6)

Country Link
US (1) US8205683B2 (ru)
EP (1) EP2240296B1 (ru)
CN (1) CN101925440B (ru)
DE (1) DE102008006030A1 (ru)
RU (1) RU2497650C2 (ru)
WO (1) WO2009092468A1 (ru)

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DE102007060057A1 (de) * 2007-12-13 2009-06-18 Robert Bosch Gmbh Handwerkzeugmaschine
JP5180697B2 (ja) * 2008-06-19 2013-04-10 株式会社マキタ 手持式作業工具
JP5395531B2 (ja) * 2009-06-19 2014-01-22 株式会社マキタ 作業工具
DE102011002404A1 (de) * 2011-01-03 2012-07-05 Robert Bosch Gmbh Handwerkzeugmaschinen-Energieversorgungseinheit
GB201112833D0 (en) * 2011-07-26 2011-09-07 Black & Decker Inc A hammer drill
DE102012103587A1 (de) * 2012-04-24 2013-10-24 C. & E. Fein Gmbh Handführbare Werkzeugmaschine mit Außengehäuse
US8966773B2 (en) * 2012-07-06 2015-03-03 Techtronic Power Tools Technology Limited Power tool including an anti-vibration handle
DE102012214257A1 (de) * 2012-08-10 2014-02-13 Robert Bosch Gmbh Elektrowerkzeug mit einem Motorgehäuse und einem Handgriff mit mehreren elastischen Dämpfungselementen
JP6096593B2 (ja) * 2013-05-29 2017-03-15 株式会社マキタ 往復動式作業工具
DE102013211013A1 (de) * 2013-06-13 2014-12-18 Robert Bosch Gmbh Handwerkzeugmaschine mit mindestens einem Gehäuse mit mindestens einem elastischen Dämpfungselement
EP2898991B1 (en) 2014-01-23 2018-12-26 Black & Decker Inc. Rear handle
EP2898993B1 (en) * 2014-01-23 2019-01-30 Black & Decker Inc. Power tool
EP2898994A1 (en) 2014-01-23 2015-07-29 Black & Decker Inc. Power tool with rear handle
EP2898992B1 (en) 2014-01-23 2016-05-04 Black & Decker Inc. Power tool with rear handle, method of manufacturing a part of a handle assembly for a power tool and method of disassembling a part of a handle assembly for a power tool
WO2015132474A1 (fr) * 2014-03-03 2015-09-11 Noretud Industries Dispositif de mise en place d'un joint d'etancheite
DE102014103856A1 (de) * 2014-03-20 2015-09-24 C. & E. Fein Gmbh Handwerkzeug mit einem Außengehäuse und einem Innengehäuse
JP6345523B2 (ja) * 2014-07-23 2018-06-20 株式会社やまびこ バッテリ駆動式作業機
CN109421033B (zh) 2017-08-31 2024-03-15 南京泉峰科技有限公司 动力工具
DE102018203179A1 (de) * 2018-03-02 2019-09-05 Robert Bosch Gmbh Vorrichtung, insbesondere Handwerkzeugmaschinen-Verwaltungsvorrichtung, und Verfahren zur Überwachung und/oder zur Verwaltung einer Vielzahl von Gegenständen
CN109333459B (zh) * 2018-08-18 2021-08-17 浙江信普工贸有限公司 一种减震电锤

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Also Published As

Publication number Publication date
DE102008006030A1 (de) 2009-07-30
US20100193209A1 (en) 2010-08-05
CN101925440B (zh) 2013-03-13
CN101925440A (zh) 2010-12-22
WO2009092468A1 (de) 2009-07-30
EP2240296A1 (de) 2010-10-20
RU2497650C2 (ru) 2013-11-10
RU2010135197A (ru) 2012-02-27
US8205683B2 (en) 2012-06-26

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