EP2251152B1 - Handheld power tool, in particular electric hand tool - Google Patents

Handheld power tool, in particular electric hand tool Download PDF

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Publication number
EP2251152B1
EP2251152B1 EP10159977.7A EP10159977A EP2251152B1 EP 2251152 B1 EP2251152 B1 EP 2251152B1 EP 10159977 A EP10159977 A EP 10159977A EP 2251152 B1 EP2251152 B1 EP 2251152B1
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EP
European Patent Office
Prior art keywords
motor housing
power tool
portable power
housing part
handle part
Prior art date
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Not-in-force
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EP10159977.7A
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German (de)
French (fr)
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EP2251152A1 (en
Inventor
Joerg Maute
Florian Esenwein
Manfred Lutz
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication date
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Publication of EP2251152A1 publication Critical patent/EP2251152A1/en
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    • 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
    • B25F5/02—Construction of casings, bodies or handles
    • 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 electric hand tool, according to the preamble of claim 1.
  • From the DE 10 2005 016 453 A1 is designed as an angle grinder electric hand tool machine, which has an electric drive motor in a motor housing.
  • the motor housing is followed by a grip part for holding and guiding the power tool, which is cup-shaped and is connected to the rear end face of the motor housing.
  • a damping ring is arranged in the connecting region between the motor housing and the handle part.
  • the EP 0 336 261 A2 shows a hand tool machine with an outer housing and an inner motor housing of an air pressure drive, which is supported via different damping elements of the inside of the outer housing.
  • a handle is connected, which connects to the front side of the housing, wherein there is a spring washer between the housing and the handle.
  • the DE 10 11 819 B shows a compressed air hammer with a cylinder guide in which a cylinder is guided with a piston.
  • the cylinder is supported by a spring on the bottom of the cylinder guide.
  • a handle engages around the cylinder guide and is supported via a further spring element on the opposite bottom side of the cylinder guide.
  • the invention is based on the object to reduce vibrations and vibrations in the handle part of the housing of a power tool with a good space utilization at the same time with simple design measures.
  • the hand tool according to the invention is preferably an electric hand tool such as an angle grinder with an electric drive motor as the drive unit.
  • the housing of the power tool is constructed in several parts and includes a two-part motor housing and in addition a handle part for holding and guiding the power tool.
  • a vibration reduction element is arranged in the transmission path between the motor housing and the handle part, so that vibrations and vibrations only in a reduced Mode in the handle part.
  • the motor housing is formed in two parts with at least two separately formed motor housing parts, between which a vibration reduction element is arranged. Furthermore, it is provided that the grip part is fixedly connected to only one of the housing parts, but not to the further motor housing part in order to avoid direct vibration transmission between this further motor housing part and the grip part.
  • the connection to the first motor housing part is easily possible because between the first and second motor housing part, the vibration reduction element is arranged so that in the transmission chain, the handle part is effectively shielded against vibration and vibration.
  • additional components can be accommodated in the further motor housing part, in particular components which are assigned to the drive unit of the handheld power tool, for example a control electronics or a power switch. Due to the positioning of the vibration reduction element between the motor housing parts arranged in the other motor housing part components as well as the handle part are protected against high vibration loads, so that it is possible to accommodate mechanically sensitive components in the respective motor housing part.
  • the handle part is formed as a hollow cylinder or cup-shaped and surrounds the associated motor housing part annular. In this way, seen in the longitudinal direction of the power tool in which the motor housing parts are arranged axially one behind the other, due to the possibility of receiving additional components in the rear motor housing part, achieved a relatively compact arrangement.
  • the handle is firmly connected to only one motor housing part, but not with the other motor housing part.
  • a contact between the other motor housing part and the handle part via a vibration reduction element which allows a relative movement and at the same time dampens vibrations and vibrations emanating from the motor housing part.
  • an additional support of the handle portion of the motor housing part is possible to which there is no firm connection.
  • the handle part as a cup-shaped housing part is the vibration reduction element to the motor housing part to which there is no firm connection, in the region of the free end face of the handle part.
  • the handle part is connected by way of example via a screw or other connecting element fixed to one of the motor housing parts, in particular in the region of the bottom of the handle part or the free end face of the relevant motor housing part.
  • the vibration reduction element between the two motor housing parts is conveniently located on the axially opposite side, with a further connection element can be provided for captive securing between the motor housing parts, which is in particular passed through the vibration reduction element to avoid direct material contact between the motor housing parts, the would lead to a vibration transmission.
  • a connecting element such as a screw is performed.
  • the connecting element presses the two housing parts together, at the same time, the two vibration reduction elements ensure effective vibration reduction.
  • vibration reduction elements are in particular damping elements into consideration, which preferably consist of a material damping material.
  • spring elements can also be used as vibration reduction elements, in which case the vibration-reducing effect is achieved by shifting the transmitted vibrations from critical to uncritical frequencies and amplitudes.
  • electric hand tool 1 for example, an angle grinder, has a multi-part housing 5, consisting of a motor housing 2 and a handle part 4 for holding and guiding the power tool.
  • the motor housing 2 is constructed in two parts with a first, front motor housing part 2a and a second, rear motor housing part 2b, which are arranged lying one behind the other in the direction of the longitudinal axis 11 of the power tool and connected to each other.
  • the front motor housing part 2 a accommodates an electric drive motor 3, in the rear motor housing part 2 b different components can be accommodated, for example control electronics for the electric motor and the electrical connections for the motor.
  • the front and rear motor housing parts 2a, 2b are connected to one another via a connecting element designed as a screw 8, which extends in the direction of the longitudinal axis 11.
  • damping elements 6 and 7 are arranged axially behind one another or in series between the two motor housing parts. Between the two damping elements 6 and 7 projects a radially inwardly bent frontal portion of the rear motor housing 2b, which is clamped between the two successively arranged damping elements 6 and 7.
  • the clamping force is generated by the screw 8, which is a disc 10 against the outside End face of the damping element 7 presses, wherein this clamping force leads to a clamping of the radially projecting frontal portion of the rear motor housing part 2 b between the two damping elements 6 and 7.
  • the handle part 4 is cup-shaped and surrounds the rear motor housing part 2b, wherein the inner diameter of the handle part 4 exceeds the outer diameter of the rear housing part 2b, so that an intermediate annular space is formed.
  • the grip part 4 is firmly connected to the rear motor housing part 2b via another connecting element designed as a screw 9, wherein the screw 9 projects into a recess which is introduced into the free, rearward end face 2c of the rear motor housing part 2b ,
  • the handle part 4 has no direct connection to the front motor housing part 2a, so that a direct vibration transmission between the front motor housing part 2a and the handle part 4 is excluded.
  • Fig. 2 largely corresponds to the one after Fig. 1 , so to the description too Fig. 1 can be referenced.
  • the damping element 6 which rests directly on the rear end face of the front motor housing part 2a, a radially outwardly facing sealing lip 6a, which is integrally formed on the damping element 6.
  • the sealing lip 6a is in contact with the inside of the encompassing grip part 4, namely adjacent to the free end face of the grip part.
  • An additional support in the radial direction of the grip part 4 on the damping element 6 is provided via the sealing lip 6a.
  • the free end face of the grip part 4 which engages over the rear motor housing part 2b in the shape of a pot, projects into an annular recess or groove 12 which is introduced into the rear end face of the front motor housing part 2a.
  • a tongue and groove connection is realized, whereby in particular the internal components of the power tool are better protected.
  • a further damping element is arranged in the recess 12 or on the end face of the grip part 4.
  • a damping ring 13 between the front motor housing part 2a and the handle part 4 is provided, whereby on the one hand, the handle part 4 is additionally supported in the radial direction, on the other hand, a direct vibration transmission is prevented.
  • the damping ring 13 rests on a circumferentially extending shoulder, which is integrally formed on the rear axial end side of the front motor housing part 2a. In the axial direction of the damping ring 13 is adjacent to the free end side of the handle part. 4
  • Fig. 5 an embodiment is shown, in which in the rear motor housing part 2b various components are integrated, for example, a heat sink 14 which breaks through the wall of the rear motor housing part 2b and protrudes into the annular space between the rear motor housing part 2b and handle part 4, and further a control electronics 15th and a power switch 16.
  • a heat sink 14 which breaks through the wall of the rear motor housing part 2b and protrudes into the annular space between the rear motor housing part 2b and handle part 4
  • a control electronics 15th and a power switch 16 In the bottom 4a of the handle part 4 flow openings are introduced, via which a cooling air flow 18 can flow axially into the annular space between the rear motor housing part 2b and handle part 4.
  • the power switch 16 for operating the electric drive motor which is arranged in the front motor housing part 2a, is connected to a power line 17 which is arranged in a cable grommet and leads over the bottom 4a of the handle part 4 to the outside.
  • the switch 16, the electronics 15 and electrical contacts are well
  • connection between the front and rear motor housing part 2a, 2b takes place in the embodiment according to Fig. 5 two parallel arranged screws 8a and 8b, which are guided by a single, arranged between the motor housing parts 2a, 2b damping element 6.
  • the handle part 4 is fixedly connected to the rear motor housing part 2b, as in the previously described exemplary embodiments, by means of a screw 9, which is arranged in the region of the base 4a.
  • the screw 8 is designed as a collar screw with a collar 19, which comes when screwed into abutment with the rear end face of the front motor housing part 2a.
  • damping element 6 with additional form-fitting portions 20 and 21, which allow an axial positive engagement with the housing parts 2 a and 2 b.
  • the form-fitting portions 20 and 21 are each formed in the manner of a button with radially expanded collar and are buttoned into recesses which are introduced into the walls of the front housing part 2a and the rear housing part 2b.
  • the damping element 6 has a further, additional form-fitting portion 22, which is arranged on the radially opposite side of the screw 8 relative to the form-fitting portion 21.
  • the additional positive locking section 22 is buttoned into a recess which is introduced into the wall of the rear motor housing part 2b.
  • a damping element 6 is arranged between the motor housing parts 2a and 2b, which is formed with form-fitting portions, which are buttoned into associated recesses in the walls of the motor housing parts 2a, 2b, whereby in the axial direction a positive connection is made.
  • 6 reinforcing elements 23, 24 are introduced, in particular injected, in the sealing body of the damping element which are formed, for example, as a wire element.
  • the reinforcing elements 23 and 24 extend in the axial direction and project beyond both end faces of the damping element 6.
  • the protruding portions of the reinforcing elements 23 and 24 can be connected to the respective walls of the motor housing parts 2a, 2b.
  • the reinforcing elements 23 and 24 advantageously have a relatively high inherent elasticity, so that the reinforcing elements are effective as spring elements and critical frequencies and amplitudes, which emanate from the front motor housing part 2a, are shifted to uncritical values.
  • the reinforcing elements 23 and 24 also serve as securing elements in the event of material failure or tearing off of the damping element 6 between the motor housing parts 2a and 2b.
  • the damping element 6 can be injection molded onto the motor housing parts 2a and 2b in a two-component injection molding process.

Description

Die Erfindung bezieht sich auf eine Handwerkzeugmaschine, insbesondere eine Elektrohandwerkzeugmaschine, nach dem Oberbegriff des Anspruches 1.The invention relates to a hand tool, in particular an electric hand tool, according to the preamble of claim 1.

Stand der TechnikState of the art

Aus der DE 10 2005 016 453 A1 ist eine als Winkelschleifer ausgebildete Elektrohandwerkzeugmaschine bekannt, die in einem Motorgehäuse einen elektrischen Antriebsmotor aufweist. An das Motorgehäuse schließt sich ein Griffteil zum Halten und Führen der Handwerkzeugmaschine an, das topfförmig ausgebildet ist und an die hintere Stirnseite des Motorgehäuses angeschlossen ist. Zur Reduzierung von Schwingungen und Vibrationen, welche vom elektrischen Antriebsmotor und der Bearbeitung eines Werkstückes ausgehen, ist im Verbindungsbereich zwischen Motorgehäuse und Griffteil ein Dämpfungsring angeordnet.From the DE 10 2005 016 453 A1 is designed as an angle grinder electric hand tool machine, which has an electric drive motor in a motor housing. The motor housing is followed by a grip part for holding and guiding the power tool, which is cup-shaped and is connected to the rear end face of the motor housing. To reduce vibrations and vibrations, which emanate from the electric drive motor and the machining of a workpiece, a damping ring is arranged in the connecting region between the motor housing and the handle part.

Die EP 0 336 261 A2 zeigt eine Handwerkzeugmaschine mit einem äußeren Gehäuse sowie einem innen liegenden Motorgehäuse eines Luftdruckantriebs, der über verschiedene Dämpfungselemente der Innenseite des äußeren Gehäuses abgestützt ist. Mit dem äußeren Gehäuse ist ein Handgriff verbunden, der sich stirnseitig an das Gehäuse anschließt, wobei sich zwischen dem Gehäuse und dem Handgriff eine Federscheibe befindet.The EP 0 336 261 A2 shows a hand tool machine with an outer housing and an inner motor housing of an air pressure drive, which is supported via different damping elements of the inside of the outer housing. With the outer housing a handle is connected, which connects to the front side of the housing, wherein there is a spring washer between the housing and the handle.

Die DE 10 11 819 B zeigt einen Presslufthandhammer mit einer Zylinderführung, in der ein Zylinder mit einem Kolben geführt ist. Der Zylinder ist über eine Feder am Boden der Zylinderführung abgestützt. Ein Handgriff umgreift die Zylinderführung und ist über ein weiteres Federelement an der gegenüberliegenden Bodenseite der Zylinderführung abgestützt.The DE 10 11 819 B shows a compressed air hammer with a cylinder guide in which a cylinder is guided with a piston. The cylinder is supported by a spring on the bottom of the cylinder guide. A handle engages around the cylinder guide and is supported via a further spring element on the opposite bottom side of the cylinder guide.

Offenbarung der ErfindungDisclosure of the invention

Der Erfindung liebt die Aufgabe zu Grunde, mit einfachen konstruktiven Maßnahmen Schwingungen und Vibrationen im Griffteil des Gehäuses einer Handwerkzeugmaschine bei zugleich guter Bauraumausnutzung zu reduzieren.The invention is based on the object to reduce vibrations and vibrations in the handle part of the housing of a power tool with a good space utilization at the same time with simple design measures.

Diese Aufgabe wird erfindungsgemäß mit den Merkmalen des Anspruches 1 gelöst. Die Unteransprüche geben zweckmäßige Weiterbildungen an.This object is achieved with the features of claim 1. The dependent claims indicate expedient developments.

Bei der erfindungsgemäßen Handwerkzeugmaschine handelt es sich vorzugsweise um eine Elektrohandwerkzeugmaschine wie z.B. einen Winkelschleifer mit einem elektrischen Antriebsmotor als Antriebseinheit. Das Gehäuse der Handwerkzeugmaschine ist mehrteilig aufgebaut und umfasst ein zweiteiliges Motorgehäuse sowie zusätzlich ein Griffteil zum Halten und Führen der Handwerkzeugmaschine. Um Schwingungen zu reduzieren, welche vom Antriebsmotor und/oder der Bearbeitung eines Werkstückes ausgehen und die sich über das Motorgehäuse in das Griffteil fortpflanzen, ist im Übertragungsweg zwischen dem Motorgehäuse und dem Griffteil ein Schwingungsreduktionselement angeordnet, so dass Schwingungen und Vibrationen sich nur in einer reduzierten Weise im Griffteil auswirken.The hand tool according to the invention is preferably an electric hand tool such as an angle grinder with an electric drive motor as the drive unit. The housing of the power tool is constructed in several parts and includes a two-part motor housing and in addition a handle part for holding and guiding the power tool. In order to reduce vibrations, which emanate from the drive motor and / or the machining of a workpiece and propagate through the motor housing in the handle part, a vibration reduction element is arranged in the transmission path between the motor housing and the handle part, so that vibrations and vibrations only in a reduced Mode in the handle part.

Erfindungsgemäß ist das Motorgehäuse zweiteilig mit mindestens zwei separat ausgebildeten Motorgehäuseteilen ausgebildet, zwischen denen ein Schwingungsreduktionselement angeordnet ist. Des Weiteren ist vorgesehen, das das Griffteil mit nur einem der Gehäuseteile fest verbunden ist, nicht jedoch mit dem weiteren Motorgehäuseteil, um eine unmittelbare Schwingungsübertragung zwischen diesem weiteren Motorgehäuseteil und dem Griffteil zu vermeiden. Die Verbindung mit dem ersten Motorgehäuseteil ist dagegen problemlos möglich, da zwischen erstem und zweitem Motorgehäuseteil das Schwingungsreduktionselement angeordnet ist, so dass in der Übertragungskette das Griffteil wirksam gegen Schwingungen und Vibrationen abgeschirmt ist.According to the invention the motor housing is formed in two parts with at least two separately formed motor housing parts, between which a vibration reduction element is arranged. Furthermore, it is provided that the grip part is fixedly connected to only one of the housing parts, but not to the further motor housing part in order to avoid direct vibration transmission between this further motor housing part and the grip part. The connection to the first motor housing part, however, is easily possible because between the first and second motor housing part, the vibration reduction element is arranged so that in the transmission chain, the handle part is effectively shielded against vibration and vibration.

Zugleich können in das weitere Motorgehäuseteil zusätzliche Bauelemente aufgenommen werden, insbesondere Bauelemente, welche der Antriebseinheit der Handwerkzeugmaschine zugeordnet sind, beispielsweise eine Steuerungselektronik oder einen Netzschalter. Auf Grund der Positionierung des Schwingungsreduktionselementes zwischen den Motorgehäuseteilen sind die in dem weiteren Motorgehäuseteil angeordneten Bauelemente ebenso wie das Griffteil vor hohen Schwingungsbelastungen geschützt, so dass es möglich ist, mechanisch empfindliche Bauelemente in dem betreffenden Motorgehäuseteil unterzubringen.At the same time, additional components can be accommodated in the further motor housing part, in particular components which are assigned to the drive unit of the handheld power tool, for example a control electronics or a power switch. Due to the positioning of the vibration reduction element between the motor housing parts arranged in the other motor housing part components as well as the handle part are protected against high vibration loads, so that it is possible to accommodate mechanically sensitive components in the respective motor housing part.

Ein weiterer Vorteil liegt in der kompakten Bauform, welche insbesondere noch dadurch verbessert wird, dass das Griffteil hohlzylindrisch oder topfförmig ausgebildet ist und das zugeordnete Motorgehäuseteil ringförmig umschließt. Auf diese Weise wird in Längsrichtung der Handwerkzeugmaschine gesehen, in der die Motorgehäuseteile axial hintereinander liegend angeordnet sind, auf Grund der Möglichkeit, zusätzliche Bauelemente in dem hinten liegenden Motorgehäuseteil aufzunehmen, eine verhältnismäßig kompakte Anordnung erzielt.Another advantage lies in the compact design, which is particularly improved by the fact that the handle part is formed as a hollow cylinder or cup-shaped and surrounds the associated motor housing part annular. In this way, seen in the longitudinal direction of the power tool in which the motor housing parts are arranged axially one behind the other, due to the possibility of receiving additional components in the rear motor housing part, achieved a relatively compact arrangement.

Das Griffteil ist nur mit einen Motorgehäuseteil fest verbunden, nicht jedoch mit dem anderen Motorgehäuseteil. Grundsätzlich möglich ist aber ein Kontakt zwischen dem weiteren Motorgehäuseteil und dem Griffteil über ein Schwingungsreduktionselement, welches eine Relativbewegung erlaubt und zugleich von dem Motorgehäuseteil ausgehende Schwingungen und Vibrationen dämpft. In dieser Ausführung ist beispielsweise eine zusätzliche Abstützung des Griffteils an dem Motorgehäuseteil möglich, zu dem keine feste Verbindung besteht. In der Ausführung des Griffteils als topfförmiges Gehäuseteil befindet sich das Schwingungsreduktionselement zu dem Motorgehäuseteil, zu dem keine feste Verbindung besteht, im Bereich der freien Stirnseite des Griffteiles.The handle is firmly connected to only one motor housing part, but not with the other motor housing part. In principle, however, is possible a contact between the other motor housing part and the handle part via a vibration reduction element, which allows a relative movement and at the same time dampens vibrations and vibrations emanating from the motor housing part. In this embodiment, for example, an additional support of the handle portion of the motor housing part is possible to which there is no firm connection. In the embodiment of the handle part as a cup-shaped housing part is the vibration reduction element to the motor housing part to which there is no firm connection, in the region of the free end face of the handle part.

Das Griffteil ist beispielhaft über eine Schraube oder ein sonstiges Verbindungselement fest mit einem der Motorgehäuseteile verbunden, und zwar insbesondere im Bereich des Bodens des Griffteiles bzw. der freien Stirnseite des betreffenden Motorgehäuseteils. Das Schwingungsreduktionselement zwischen den beiden Motorgehäuseteilen befindet sich dagegen zweckmäßigerweise an der axial gegenüberliegenden Seite, wobei für eine unverlierbare Sicherung zwischen den Motorgehäuseteilen ein weiteres Verbindungselement vorgesehen sein kann, das insbesondere durch das Schwingungsreduktionselement hindurchgeführt ist, um einen direkten Materialkontakt zwischen den Motorgehäuseteilen zu vermeiden, der zu einer Schwingungsübertragung führen würde.The handle part is connected by way of example via a screw or other connecting element fixed to one of the motor housing parts, in particular in the region of the bottom of the handle part or the free end face of the relevant motor housing part. The vibration reduction element between the two motor housing parts, however, is conveniently located on the axially opposite side, with a further connection element can be provided for captive securing between the motor housing parts, which is in particular passed through the vibration reduction element to avoid direct material contact between the motor housing parts, the would lead to a vibration transmission.

Für eine wirkungsvolle Schwingungsreduzierung einerseits und eine feste Verbindung zwischen den Motorgehäuseteilen andererseits kann es zweckmäßig sein, in Verbindungsrichtung zwei hintereinander angeordnete, in Reihe liegende Schwingungsreduktionselemente vorzusehen, wobei parallel zu diesen beiden Schwingungsreduktionselementen ein Verbindungselement, beispielsweise eine Schraube geführt ist. Das Verbindungselement presst die beiden Gehäuseteile aneinander, zugleich sorgen die beiden Schwingungsreduktionselemente für eine wirksame Schwingungsreduzierung.For an effective vibration reduction on the one hand and a fixed connection between the motor housing parts on the other hand, it may be expedient to provide two successive arranged in series vibration reduction elements in the connecting direction, parallel to these two vibration reduction elements, a connecting element, such as a screw is performed. The connecting element presses the two housing parts together, at the same time, the two vibration reduction elements ensure effective vibration reduction.

Um die von dem Griffteil umschlossenen Bauelemente der Handwerkzeugmaschine zu schützen, kann es zweckmäßig sein, nach Art einer Nut-Feder-Verbindung das nicht mit dem Griffteil verbundene Motorgehäuseteil und das Griffteil formschlüssig ineinandergreifen zu lassen, jedoch ohne feste Verbindung, um eine direkte Schwingungsübertragung zu vermeiden.In order to protect the enclosed by the handle components of the power tool, it may be appropriate in the manner of a tongue and groove connection not connected to the handle part motor housing part and the Handle part form-fitting interlock, but without a firm connection to avoid a direct vibration transmission.

Als Schwingungsreduktionselemente kommen insbesondere Dämpfungselemente in Betracht, welche bevorzugt aus einem Material dämpfenden Material bestehen. Grundsätzlich können als Schwingungsreduktionselemente auch Federelemente verwendet werden, wobei in diesem Fall die schwingungsreduzierende Wirkung durch eine Verlagerung der übertragenen Schwingungen von kritischen zu unkritischen Frequenzen und Amplituden erreicht wird.As vibration reduction elements are in particular damping elements into consideration, which preferably consist of a material damping material. In principle, spring elements can also be used as vibration reduction elements, in which case the vibration-reducing effect is achieved by shifting the transmitted vibrations from critical to uncritical frequencies and amplitudes.

Weitere Vorteile und zweckmäßige Ausführungen sind den weiteren Ansprüchen, der Figurenbeschreibung und den Zeichnungen zu entnehmen. Es zeigen:

Fig. 1
einen Schnitt durch eine elektrische Handwerkzeugmaschine mit einem zweiteiligen Motorgehäuse und einem Griffteil, welches das hintere Motorgehäuseteil umschließt, wobei das Griffteil mit dem hinteren Motorgehäuseteil fest verbunden ist und zwischen den beiden Motorgehäuseteilen zwei scheibenförmige Dämpfungselemente axial hintereinander liegend angeordnet sind,
Fig. 2
eine ähnliche Ausführung wie Fig. 1, jedoch mit einer angeformten Dichtlippe an einem der Dämpfungselemente zwischen den beiden Motorgehäuseteilen, wobei die Dichtlippe in Kontakt mit der Innenseite des Griffteiles steht,
Fig. 3
ein weiteres Ausführungsbeispiel, bei dem die Stirnseite des Griffteils nach Art einer Nut-Feder-Verbindung in eine zugeordnete Ausnehmung am vorne liegenden Motorgehäuseteil einragt,
Fig. 4
ein weiteres Ausführungsbeispiel, bei dem ein Dämpfungsring zwischen der Innenseite des Griffteiles im Bereich der freien Stirnseite und ein Absatz des vorne liegenden Gehäuseteils angeordnet ist,
Fig. 5
ein Ausführungsbeispiel, bei dem im hinteren Motorgehäuseteil verschiedene Bauelemente angeordnet sind,
Fig. 6
eine Variante zur Verbindung der beiden Motorgehäuseteile mit zwei in Reihe angeordneten Dämpfungselementen,
Fig. 7
die Verbindung zwischen den Motorgehäuseteilen in einer weiteren Ausführung,
Fig. 8
noch eine weitere Ausführung der Verbindung zwischen den Motorgehäuseteilen,
Fig. 9
noch eine weitere Ausführung der Verbindung zwischen den Motorgehäuseteilen.
Further advantages and expedient embodiments can be taken from the further claims, the description of the figures and the drawings. Show it:
Fig. 1
a section through an electric hand tool with a two-part motor housing and a handle which encloses the rear motor housing part, wherein the handle part is fixedly connected to the rear motor housing part and between the two motor housing parts two disc-shaped damping elements are arranged axially behind the other,
Fig. 2
a similar design as Fig. 1 but with a molded sealing lip on one of the damping elements between the two motor housing parts, wherein the sealing lip is in contact with the inside of the handle part,
Fig. 3
a further embodiment in which the end face of the grip part protrudes in the manner of a tongue and groove connection in an associated recess on the front motor housing part,
Fig. 4
a further embodiment in which a damping ring between the inside of the handle part in the region of the free end face and a shoulder of the front housing part is arranged,
Fig. 5
an embodiment in which various components are arranged in the rear motor housing part,
Fig. 6
a variant for connecting the two motor housing parts with two damping elements arranged in series,
Fig. 7
the connection between the motor housing parts in a further embodiment,
Fig. 8
yet another embodiment of the connection between the motor housing parts,
Fig. 9
Yet another embodiment of the connection between the motor housing parts.

In den Figuren sind gleiche Bauteile mit gleichen Bezugszeichen versehen.In the figures, the same components are provided with the same reference numerals.

Die in Fig. 1 dargestellte Elektrohandwerkzeugmaschine 1, beispielsweise ein Winkelschleifer, weist ein mehrteiliges Gehäuse 5 auf, bestehend aus einem Motorgehäuse 2 und einem Griffteil 4 zum Halten und Führen der Handwerkzeugmaschine. Das Motorgehäuse 2 ist zweiteilig aufgebaut mit einem ersten, vorderen Motorgehäuseteil 2a und einem zweiten, hinteren Motorgehäuseteil 2b, die in Richtung der Längsachse 11 der Handwerkzeugmaschine gesehen hintereinander liegend angeordnet und miteinander verbunden sind. Das vordere Motorgehäuseteil 2a nimmt einen elektrischen Antriebsmotor 3 auf, im hinteren Motorgehäuseteil 2b können verschiedene Bauelemente aufgenommen werden, beispielsweise eine Steuerungselektronik für den Elektromotor und die elektrischen Anschlüsse für den Motor.In the Fig. 1 shown electric hand tool 1, for example, an angle grinder, has a multi-part housing 5, consisting of a motor housing 2 and a handle part 4 for holding and guiding the power tool. The motor housing 2 is constructed in two parts with a first, front motor housing part 2a and a second, rear motor housing part 2b, which are arranged lying one behind the other in the direction of the longitudinal axis 11 of the power tool and connected to each other. The front motor housing part 2 a accommodates an electric drive motor 3, in the rear motor housing part 2 b different components can be accommodated, for example control electronics for the electric motor and the electrical connections for the motor.

Das vordere und das hintere Motorgehäuseteil 2a, 2b sind über ein als Schraube 8 ausgeführtes Verbindungselement, welches sich in Richtung der Längsachse 11 erstreckt, miteinander verbunden. Um eine Schwingungsübertragung vom vorderen Motorgehäuseteil 2a auf das hintere Motorgehäuseteil 2b zu reduzieren, sind zwischen den beiden Motorgehäuseteilen Dämpfungselemente 6 und 7 axial hintereinander bzw. in Reihe liegend angeordnet. Zwischen die beiden Dämpfungselemente 6 und 7 ragt ein radial nach innen umgebogener stirnseitiger Abschnitt des hinteren Motorgehäuses 2b ein, der zwischen den beiden hintereinander angeordneten Dämpfungselementen 6 und 7 eingeklemmt ist. Die Klemmkraft wird von der Schraube 8 erzeugt, die eine Scheibe 10 gegen die äußere Stirnfläche des Dämpfungselementes 7 drückt, wobei diese Klemmkraft zu einem Festklemmen des radial einragenden stirnseitigen Abschnittes des hinteren Motorgehäuseteils 2b zwischen den beiden Dämpfungselementen 6 und 7 führt.The front and rear motor housing parts 2a, 2b are connected to one another via a connecting element designed as a screw 8, which extends in the direction of the longitudinal axis 11. In order to reduce vibration transmission from the front motor housing part 2a to the rear motor housing part 2b, damping elements 6 and 7 are arranged axially behind one another or in series between the two motor housing parts. Between the two damping elements 6 and 7 projects a radially inwardly bent frontal portion of the rear motor housing 2b, which is clamped between the two successively arranged damping elements 6 and 7. The clamping force is generated by the screw 8, which is a disc 10 against the outside End face of the damping element 7 presses, wherein this clamping force leads to a clamping of the radially projecting frontal portion of the rear motor housing part 2 b between the two damping elements 6 and 7.

Das Griffteil 4 ist topfförmig ausgebildet und umgreift das hintere Motorgehäuseteil 2b, wobei der Innendurchmesser des Griffteils 4 den Außendurchmesser des hinteren Gehäuseteils 2b übersteigt, so dass ein zwischenliegender Ringraum gebildet ist. Im Bereich des Bodens 4a ist das Griffteil 4 über ein weiteres, als Schraube 9 ausgeführtes Verbindungselement fest mit dem hinteren Motorgehäuseteil 2b verbunden, wobei die Schraube 9 in eine Ausnehmung einragt, die in die freie, hinten liegende Stirnseite 2c des hinteren Motorgehäuseteils 2b eingebracht ist.The handle part 4 is cup-shaped and surrounds the rear motor housing part 2b, wherein the inner diameter of the handle part 4 exceeds the outer diameter of the rear housing part 2b, so that an intermediate annular space is formed. In the region of the bottom 4a, the grip part 4 is firmly connected to the rear motor housing part 2b via another connecting element designed as a screw 9, wherein the screw 9 projects into a recess which is introduced into the free, rearward end face 2c of the rear motor housing part 2b ,

Das Griffteil 4 besitzt keine direkte Verbindung zum vorderen Motorgehäuseteil 2a, so dass auch eine direkte Schwingungsübertragung zwischen dem vorderen Motorgehäuseteil 2a und dem Griffteil 4 ausgeschlossen ist.The handle part 4 has no direct connection to the front motor housing part 2a, so that a direct vibration transmission between the front motor housing part 2a and the handle part 4 is excluded.

Das Ausführungsbeispiel gemäß Fig. 2 entspricht weitgehend demjenigen nach Fig. 1, so dass auf die Beschreibung zu Fig. 1 verwiesen werden kann. Im Unterschied zum ersten Ausführungsbeispiel weist jedoch das Dämpfungselement 6, welches unmittelbar an der hinteren Stirnseite des vorderen Motorgehäuseteils 2a anliegt, eine radial nach außen weisende Dichtlippe 6a auf, die einstückig an dem Dämpfungselement 6 angeformt ist. Die Dichtlippe 6a liegt auf Kontakt zur Innenseite des umgreifenden Griffteils 4, und zwar benachbart zur freien Stirnseite des Griffteils. Über die Dichtlippe 6a ist eine zusätzliche Abstützung in Radialrichtung des Griffteiles 4 am Dämpfungselement 6 gegeben.The embodiment according to Fig. 2 largely corresponds to the one after Fig. 1 , so to the description too Fig. 1 can be referenced. In contrast to the first embodiment, however, the damping element 6, which rests directly on the rear end face of the front motor housing part 2a, a radially outwardly facing sealing lip 6a, which is integrally formed on the damping element 6. The sealing lip 6a is in contact with the inside of the encompassing grip part 4, namely adjacent to the free end face of the grip part. An additional support in the radial direction of the grip part 4 on the damping element 6 is provided via the sealing lip 6a.

Im Ausführungsbeispiel nach Fig. 3 ragt die freie Stirnseite des Griffteils 4, die das hintere Motorgehäuseteil 2b topfförmig übergreift, in eine ringförmige Ausnehmung bzw. Nut 12 ein, die in die hintere Stirnseite des vorderen Motorgehäuseteils 2a eingebracht ist. Dadurch wird eine Nut-Feder-Verbindung realisiert, wodurch insbesondere die im Inneren liegenden Bauelemente der Handwerkzeugmaschine besser geschützt sind. Allerdings ist es zweckmäßig, einen unmittelbaren Kontakt zwischen der Stirnseite des Griffteiles 4 und einer begrenzenden Wandung der Ausnehmung 12 zu vermeiden, um eine direkte Schwingungsübertragung zwischen dem vorderen Motorgehäuseteil 2a und dem Griffteil 4 auszuschließen. Gegebenenfalls ist in die Ausnehmung 12 bzw. an der Stirnseite des Griffteils 4 ein weiteres Dämpfungselement angeordnet.In the embodiment according to Fig. 3 the free end face of the grip part 4, which engages over the rear motor housing part 2b in the shape of a pot, projects into an annular recess or groove 12 which is introduced into the rear end face of the front motor housing part 2a. As a result, a tongue and groove connection is realized, whereby in particular the internal components of the power tool are better protected. However, it is expedient to avoid direct contact between the end face of the handle part 4 and a limiting wall of the recess 12, to a direct vibration transmission to exclude between the front motor housing part 2 a and the handle part 4. Optionally, a further damping element is arranged in the recess 12 or on the end face of the grip part 4.

Im Ausführungsbeispiel gemäß Fig. 4 ist als weiteres Schwingungsreduktionselement ein Dämpfungsring 13 zwischen dem vorderen Motorgehäuseteil 2a und dem Griffteil 4 vorgesehen, wodurch einerseits das Griffteil 4 in Radialrichtung zusätzlich abgestützt ist, andererseits eine direkte Schwingungsübertragung verhindert wird. Der Dämpfungsring 13 liegt auf einem sich in Umfangsrichtung erstreckenden Absatz auf, der an der hinteren axialen Stirnseite des vorderen Motorgehäuseteils 2a angeformt ist. In Achsrichtung befindet sich der Dämpfungsring 13 benachbart zur freien Stirnseite des Griffteils 4.In the embodiment according to Fig. 4 is as a further vibration reduction element, a damping ring 13 between the front motor housing part 2a and the handle part 4 is provided, whereby on the one hand, the handle part 4 is additionally supported in the radial direction, on the other hand, a direct vibration transmission is prevented. The damping ring 13 rests on a circumferentially extending shoulder, which is integrally formed on the rear axial end side of the front motor housing part 2a. In the axial direction of the damping ring 13 is adjacent to the free end side of the handle part. 4

In Fig. 5 ist ein Ausführungsbeispiel dargestellt, bei dem in das hintere Motorgehäuseteil 2b diverse Bauelemente integriert sind, beispielsweise ein Kühlkörper 14, der die Wandung des hinteren Motorgehäuseteils 2b durchbricht und in den ringförmigen Zwischenraum zwischen hinterem Motorgehäuseteil 2b und Griffteil 4 einragt, sowie des Weiteren eine Steuerungselektronik 15 und ein Netzschalter 16. In den Boden 4a des Griffteils 4 sind Strömungsöffnungen eingebracht, über die ein Kühlluftstrom 18 axial in den Ringraum zwischen hinterem Motorgehäuseteil 2b und Griffteil 4 einströmen kann. Der Netzschalter 16 zur Betätigung des elektrischen Antriebsmotors, welcher im vorderen Motorgehäuseteil 2a angeordnet ist, ist mit einer Netzleitung 17 verbunden, die in einer Kabeltülle angeordnet ist und über den Boden 4a des Griffteiles 4 nach außen führt. In dieser Ausführung sind der Schalter 16, die Elektronik 15 sowie elektrische Kontakte vor Verschmutzung und der Gefahr von Kurzschlüssen gut geschützt, was sich positiv auf die Lebensdauer und die Produktsicherheit auswirkt.In Fig. 5 an embodiment is shown, in which in the rear motor housing part 2b various components are integrated, for example, a heat sink 14 which breaks through the wall of the rear motor housing part 2b and protrudes into the annular space between the rear motor housing part 2b and handle part 4, and further a control electronics 15th and a power switch 16. In the bottom 4a of the handle part 4 flow openings are introduced, via which a cooling air flow 18 can flow axially into the annular space between the rear motor housing part 2b and handle part 4. The power switch 16 for operating the electric drive motor, which is arranged in the front motor housing part 2a, is connected to a power line 17 which is arranged in a cable grommet and leads over the bottom 4a of the handle part 4 to the outside. In this embodiment, the switch 16, the electronics 15 and electrical contacts are well protected against contamination and the risk of short circuits, which has a positive effect on the life and product safety.

Die Verbindung zwischen vorderem und hinterem Motorgehäuseteil 2a, 2b erfolgt im Ausführungsbeispiel nach Fig. 5 über zwei parallel angeordnete Schrauben 8a und 8b, die durch ein einzelnes, zwischen den Motorgehäuseteilen 2a, 2b angeordnetes Dämpfungselement 6 geführt sind.The connection between the front and rear motor housing part 2a, 2b takes place in the embodiment according to Fig. 5 two parallel arranged screws 8a and 8b, which are guided by a single, arranged between the motor housing parts 2a, 2b damping element 6.

Das Griffteil 4 ist wie bei den vorbeschriebenen Ausführungsbeispielen über eine Schraube 9, welche im Bereich des Bodens 4a angeordnet ist, mit dem hinteren Motorgehäuseteil 2b fest verbunden.The handle part 4 is fixedly connected to the rear motor housing part 2b, as in the previously described exemplary embodiments, by means of a screw 9, which is arranged in the region of the base 4a.

Im Ausführungsbeispiel gemäß Fig. 6 sind zwei axial hintereinander liegende Dämpfungselemente 6 und 7 zwischen den Motorgehäuseteilen 2a und 2b angeordnet. Die Verbindung zwischen den Motorgehäuseteilen erfolgt über die Schraube 8, die durch beide Dämpfungselemente 6, 7 hindurch geführt ist. Der Kopf der Schraube 8 liegt unmittelbar an dem Dämpfungselement 7 an und ist dadurch weich gelagert. Außerdem sind in das Dämpfungselement 7 Ausnehmungen eingebracht, in die Abschnitte des hinteren Motorgehäuseteils 2b einragen, wodurch in Radialrichtung ein Formschluss zwischen dem Dämpfungselement 7 und dem hinteren Motorgehäuseteil 2b gegeben ist.In the embodiment according to Fig. 6 two axially successive damping elements 6 and 7 are arranged between the motor housing parts 2a and 2b. The connection between the motor housing parts via the screw 8, which is guided through both damping elements 6, 7. The head of the screw 8 abuts directly on the damping element 7 and is thus supported soft. In addition, 7 recesses are introduced into the damping element, protrude into the sections of the rear motor housing part 2b, whereby a positive connection between the damping element 7 and the rear motor housing part 2b is given in the radial direction.

Für eine definierte Einschraubtiefe ist die Schraube 8 als Bundschraube mit einem Bund 19 ausgeführt, der beim Einschrauben in Anlage mit der hinteren Stirnseite des vorderen Motorgehäuseteils 2a gelangt.For a defined screw-in depth, the screw 8 is designed as a collar screw with a collar 19, which comes when screwed into abutment with the rear end face of the front motor housing part 2a.

Im Ausführungsbeispiel gemäß Fig. 7 ist das zwischen den Motorgehäuseteilen 2a und 2b angeordnete Dämpfungselement 6 mit zusätzlichen Formschlussabschnitten 20 und 21 ausgebildet, die einen axialen Formschluss mit den Gehäuseteilen 2a und 2b ermöglichen. Die Formschlussabschnitte 20 und 21 sind jeweils nach Art eines Knopfes mit radial erweitertem Kragen ausgebildet und werden in Ausnehmungen eingeknöpft, welche in die Wandungen des vorderen Gehäuseteils 2a bzw. des hinteren Gehäuseteils 2b eingebracht sind.In the embodiment according to Fig. 7 is arranged between the motor housing parts 2 a and 2 b arranged damping element 6 with additional form-fitting portions 20 and 21, which allow an axial positive engagement with the housing parts 2 a and 2 b. The form-fitting portions 20 and 21 are each formed in the manner of a button with radially expanded collar and are buttoned into recesses which are introduced into the walls of the front housing part 2a and the rear housing part 2b.

Das Ausführungsbeispiel gemäß Fig. 8 entspricht weitgehend demjenigen nach Fig. 7, jedoch besitzt das Dämpfungselement 6 einen weiteren, zusätzlichen Formschlussabschnitt 22, der bezogen auf den Formschlussabschnitt 21 auf der radial gegenüberliegenden Seite der Schraube 8 angeordnet ist. Der zusätzliche Formschlussabschnitt 22 ist in eine Ausnehmung eingeknöpft, die in die Wandung des hinteren Motorgehäuseteils 2b eingebracht ist.The embodiment according to Fig. 8 largely corresponds to the one after Fig. 7 However, the damping element 6 has a further, additional form-fitting portion 22, which is arranged on the radially opposite side of the screw 8 relative to the form-fitting portion 21. The additional positive locking section 22 is buttoned into a recess which is introduced into the wall of the rear motor housing part 2b.

Auch im Ausführungsbeispiel gemäß Fig. 9 ist zwischen den Motorgehäuseteilen 2a und 2b ein Dämpfungselement 6 angeordnet, das mit Formschlussabschnitten ausgebildet ist, welche in zugeordnete Ausnehmungen in den Wandungen der Motorgehäuseteile 2a, 2b einknöpfbar sind, wodurch in Achsrichtung ein Formschluss hergestellt wird. Außerdem sind in den Dichtkörper des Dämpfungselementes 6 Verstärkungselemente 23, 24 eingebracht, insbesondere eingespritzt, die beispielsweise als Drahtelement ausgebildet sind. Die Verstärkungselemente 23 und 24 erstrecken sich in Achsrichtung und überragen beide Stirnflächen des Dämpfungselementes 6. Die herausragenden Abschnitte der Verstärkungselemente 23 und 24 können mit den jeweiligen Wandungen der Motorgehäuseteile 2a, 2b verbunden werden. Die Verstärkungselemente 23 und 24 besitzen vorteilhafterweise eine verhältnismäßig hohe Eigenelastizität, so dass die Verstärkungselemente als Federelementen wirksam sind und kritische Frequenzen und Amplituden, welche vom vorderen Motorgehäuseteil 2a ausgehen, hin zu unkritischen Werten verlagert werden.Also in the embodiment according to Fig. 9 is a damping element 6 is arranged between the motor housing parts 2a and 2b, which is formed with form-fitting portions, which are buttoned into associated recesses in the walls of the motor housing parts 2a, 2b, whereby in the axial direction a positive connection is made. In addition, 6 reinforcing elements 23, 24 are introduced, in particular injected, in the sealing body of the damping element which are formed, for example, as a wire element. The reinforcing elements 23 and 24 extend in the axial direction and project beyond both end faces of the damping element 6. The protruding portions of the reinforcing elements 23 and 24 can be connected to the respective walls of the motor housing parts 2a, 2b. The reinforcing elements 23 and 24 advantageously have a relatively high inherent elasticity, so that the reinforcing elements are effective as spring elements and critical frequencies and amplitudes, which emanate from the front motor housing part 2a, are shifted to uncritical values.

Die Verstärkungselemente 23 und 24 dienen zudem als Sicherungselemente für den Fall eines Materialversagens bzw. Abreißens des Dämpfungselements 6 zwischen den Motorgehäuseteilen 2a und 2b.The reinforcing elements 23 and 24 also serve as securing elements in the event of material failure or tearing off of the damping element 6 between the motor housing parts 2a and 2b.

Das Dämpfungselement 6 kann ggf. im Zwei-Komponenten-Spritzgussverfahren an die Motorgehäuseteile 2a und 2b angespritzt werden.If necessary, the damping element 6 can be injection molded onto the motor housing parts 2a and 2b in a two-component injection molding process.

Claims (13)

  1. Portable power tool, in particular portable electric power tool, having a housing (5) that has at least two separate housing parts (2, 4) to be connected together, wherein one housing part is in the form of a handle part (4) for holding and guiding the portable power tool (1) and a vibration reducing element (6, 7) is arranged in the transmission path between the housing parts (2, 4), wherein the motor housing (2) consists of at least two separately formed motor housing parts (2a, 2b), between which a vibration reducing element (6, 7) is arranged, wherein the handle part (4) is firmly connected to only one motor housing part (2b), characterized in that the two motor housing parts (2a, 2b) are arranged in succession as seen in the direction of the longitudinal axis (11) of the portable power tool (1), and in that the first and the second motor housing part (2a, 2b), for the one part, and the second motor housing part (2b) and the handle part (4), for the other part, are each connected together on opposite end sides (2c), wherein the handle part (4) is formed in a hollow-cylindrical or pot-like manner and annularly encloses the associated motor housing part (2b).
  2. Portable power tool according to Claim 1, characterized in that the handle part (4) is in the form of a handle sleeve and encloses the motor housing part (2b) to which the handle part (4) is firmly connected.
  3. Portable power tool according to Claim 2, characterized in that electric or electronic components (15, 16) of a drive motor are arranged in the motor housing part (2b) enclosed by the handle sleeve (4).
  4. Portable power tool according to one of Claims 1 to 3, characterized in that the handle part (4) and the motor housing part (2b) are connected together in the region of their end side (2c) in the axial direction.
  5. Portable power tool according to one of Claims 1 to 4, characterized in that a drive unit of the portable power tool (1) is arranged in the motor housing part (2a) that is not firmly connected to the handle part (4).
  6. Portable power tool according to one of Claims 1 to 5, characterized in that components assigned to the drive unit of the portable power tool (1), for example power electronics (15) or a power switch (16), are accommodated in the motor housing part (2b) connected to the handle part (4).
  7. Portable power tool according to one of Claims 1 to 6, characterized in that two vibration reducing elements (6, 7) that are in series in the connecting direction are arranged between the first and the second motor housing part (2a, 2b).
  8. Portable power tool according to one of Claims 1 to 7, characterized in that the vibration reducing element (6, 7) arranged between the first and the second motor housing part (2a, 2b) is additionally also in contact with the handle part (4).
  9. Portable power tool according to one of Claims 1 to 8, characterized in that the first motor housing part (2a), not connected to the handle part (4), and the handle part (4) have portions that engage in one another in a form-fitting, tongue-and-groove-like manner but are not firmly connected together.
  10. Portable power tool according to one of Claims 1 to 9, characterized in that a vibration reducing element (13) is arranged between the first motor housing part (2a), not connected to the handle part (4), and the handle part (4).
  11. Portable power tool according to one of Claims 1 to 10, characterized in that at least one vibration reducing element is embodied as a damping element (6, 7).
  12. Portable power tool according to one of Claims 1 to 11, characterized in that at least one vibration reducing element is embodied as a spring element.
  13. Portable power tool housing in a portable power tool (1) according to one of Claims 1 to 12.
EP10159977.7A 2009-05-11 2010-04-15 Handheld power tool, in particular electric hand tool Not-in-force EP2251152B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200910002982 DE102009002982A1 (en) 2009-05-11 2009-05-11 Hand tool machine, in particular electric hand tool machine

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EP2251152A1 EP2251152A1 (en) 2010-11-17
EP2251152B1 true EP2251152B1 (en) 2019-01-23

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JP5704955B2 (en) 2011-02-17 2015-04-22 株式会社マキタ Anti-vibration handle
DE102011006369A1 (en) * 2011-03-29 2012-10-04 Hilti Aktiengesellschaft Electric power tool with electronic cooling
DE102011017671A1 (en) 2011-04-28 2012-10-31 Hilti Aktiengesellschaft Hand tool
DE102011081442A1 (en) * 2011-08-23 2013-02-28 Robert Bosch Gmbh Hand tool
DE102011113737A1 (en) * 2011-09-15 2013-03-21 C. & E. Fein Gmbh Oscillatory drivable machine tool e.g. grinding tool has passive damping element that is assembled at oscillation gear or motor, and is connected to actuator for active damping of vibration
DE102012212066A1 (en) * 2012-07-11 2014-01-16 Robert Bosch Gmbh Portable machine tool
DE102016215660A1 (en) * 2016-08-22 2018-02-22 Robert Bosch Gmbh Hand tool and method for damping a hand tool
EP3381620B1 (en) * 2017-03-31 2019-08-28 Andreas Stihl AG & Co. KG Manually operated work device

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DE102009002982A1 (en) 2010-11-18

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