EP2429770B1 - Hand-held power tool, in particular electric hand-held power tool - Google Patents

Hand-held power tool, in particular electric hand-held power tool Download PDF

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Publication number
EP2429770B1
EP2429770B1 EP10713918.0A EP10713918A EP2429770B1 EP 2429770 B1 EP2429770 B1 EP 2429770B1 EP 10713918 A EP10713918 A EP 10713918A EP 2429770 B1 EP2429770 B1 EP 2429770B1
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EP
European Patent Office
Prior art keywords
power tool
hand
held power
housing
spring element
Prior art date
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Not-in-force
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EP10713918.0A
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German (de)
French (fr)
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EP2429770A1 (en
Inventor
Joachim Schadow
Joerg Maute
Manfred Lutz
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP2429770A1 publication Critical patent/EP2429770A1/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.
  • a hand tool with a multi-part housing known which comprises an inner housing and a cup-shaped, the inner housing cross-outer housing.
  • spring elements which are integrally formed with the inner housing.
  • adjusting element which serves to adjust the bias of the spring elements in the annular space between the inner and outer housing.
  • the actuator acts on a pressure plate which is connected to the outer housing. Upon actuation of the actuator, an axial relative displacement between the inner and outer housing is generated, resulting in the desired adjustment of the bias voltage.
  • the invention is based on the object to achieve an effective vibration reduction in the handle part of a power tool with simple constructive measures.
  • the hand tool according to the invention is preferably an electric hand tool, whose drive unit is designed as an electric drive motor, which is arranged in a motor housing.
  • the motor housing is followed by a handle part, via which the power tool is held and guided.
  • a vibration reduction element Between the handle part and another housing part - usually the motor housing - is a vibration reduction element, which has the task to reduce vibrations and vibrations in the handle.
  • the vibration reduction element is designed as a spring element, which is arranged in a space between the handle part on the one hand and the other housing part on the other.
  • a designed as a separate component spring element as a vibration reduction element has the advantage that on the one hand a support of the handle part is given to the other housing part and the other amplitude and frequencies of the vibrations, which emanate from the other housing part, are shifted from critical to non-critical values , so that the objective and subjective vibration load is reduced in the handle part.
  • spring element different types of springs can be used, for example, leaf springs, coil springs, disc springs, corrugated springs, diaphragm springs or the like.
  • the spring element is connected due to its design as a separate component in the space between the handle part and the other housing part expediently at least one of the housing parts involved, for example screwed. But it is also possible to rest on one or both housing parts without further fastening measure, the spring element expediently stops, depressions or other Form MUSTISSen are provided to the spring element on one or both housing parts preferably form-fitting in the axial direction, in Radial direction and / or to fix in the circumferential direction.
  • the power transmission takes place depending on the installation location and type of spring element in one or more axial directions.
  • a support of the handle portion in the radial direction and in the circumferential direction into consideration.
  • the handle part is formed as a hollow cylinder or pot-shaped and pushed onto the further housing part, between the outer surface of the further housing part and the inside of the handle expediently an annular space is formed in order to avoid direct contact between the walls of the handle part and further housing part. Also in the region of the pot bottom or the end face of the other housing part, a gap may be present to prevent direct contact and an accompanying direct vibration transmission at this point.
  • a first spring element is arranged in the area of the rear end face of the further housing part and the facing pot bottom of the grip part, via which forces are mainly transmitted in the axial direction.
  • At least one further spring element is located in the annular space between the lateral surface of the further housing part and the inside of the grip part, wherein support via this further spring element in the radial direction and possibly also in the circumferential direction is achieved.
  • a leaf spring element in the space between the outer surface of the housing part and the inside of the encompassing handle portion either a radially effective coil spring or a corrugated spring element can be used, either on the entire circumference or extends over a partial angle range in the circumferential direction.
  • a preferably effective in the axial direction spring element may be arranged, which is supported on a shoulder of the further housing part and which also extends either over the entire circumference or only over a limited angular segment in the circumferential direction.
  • a damping element is arranged in addition to the at least one spring element between the handle part and the housing part, which in particular assumes the function of a sliding element and allows a relative movement between the handle part and the further housing part.
  • the sliding element assumes a supporting function in the radial direction, wherein due to the damping properties, the vibrations emanating from the further housing part are reduced.
  • the relative movement between the handle part and the further housing part preferably takes place in the axial direction and / or in the circumferential direction, optionally also in the radial direction.
  • electric hand tool 1 has a two-part housing 5, consisting of a motor housing 2 with an electric drive motor 3 arranged therein and a handle part 4 which is cup-shaped and is pushed onto the motor housing 2.
  • the inner diameter of the grip part 4 exceeds the outer diameter of the motor housing 2, whereby an annular space is formed between the outer surface of the motor housing 2 and the inner side of the grip part 4.
  • the bottom 4a of the handle part 4 is at an axial distance to the rear axial end 2a of the motor.
  • the grip part 4 is supported on the motor housing 2 via a spring element 6, which is arranged in the annular space between the motor housing 2 and the grip part 4.
  • the spring element 6 is in the embodiment according to Fig. 1 formed as a spiral spring or possibly also as a wave spring and extends in the radial direction, relative to the longitudinal axis 8 of the power tool 1.
  • the spring element 6 supports the grip part 4 in the radial direction on the motor housing 2 from.
  • the spring element 6 also acts in the circumferential direction and thus holds the grip part 4 in a desired angular position relative to the motor housing 2.
  • each recesses introduced into which the spring element 6 is inserted are each recesses introduced into which the spring element 6 is inserted.
  • a plurality of such spring elements may be provided to correspondingly the handle part Support 4 over the axial length and the circumference of the motor housing 2.
  • the grip part 4 is supported with its inner side on a sliding element 7, which is applied to the outer surface of the motor housing 2 and fixed there.
  • the sliding member 7 allows a relative movement of the handle part 4 relative to the motor housing 2, both axial and in the circumferential direction and possibly also in the radial direction.
  • the sliding member 7 also assumes the function of a damping element and is accordingly made of a damping material to ensure that when the grip part 4 vibrations of the motor housing are forwarded in an only reduced manner.
  • the sliding element 7 is an optional component which may possibly be dispensed with.
  • a spring element 6 is located in the annular space between the lateral surface of the motor housing 2 and the inside of the handle part 4, a spring element 6, but, as well as the sectional view according to Fig. 3 to be taken as a corrugated leaf spring is executed.
  • the spring element 6 extends in the circumferential direction, wherein both embodiments with a only a limited angular segment extending leaf spring and an annular leaf spring come into consideration, in which the spring element extends over the entire circumference. Due to the wave-shaped structure of the leaf spring 6 are distributed over the circumference in each case a plurality of spring mounds and spring valleys on the inside of the handle part 4 and the lateral surface of the motor housing 2 at.
  • Analogous to the previous embodiment is adjacent to the free end face of the handle part 4 on the lateral surface of the motor housing 2, a sliding member 7, on which the inside of the handle part 4 is supported.
  • This sliding element 7 is optionally available and can be omitted if necessary.
  • the spring element 9 is formed as a leaf spring and connected by a screw 10 fixed to the rear end side of the motor housing 2.
  • the spring element 9 is also connected to the inside of the bottom 4a of the Handle part 4 connected.
  • the spring element 9 acts primarily axially in the direction of the longitudinal axis 8, but also in the radial and circumferential direction.
  • the spring element 6 in the annular space is inserted into recesses in the lateral surface of the motor housing 2 and on the inside of the handle part 4 and thereby fixed in the axial direction. Basically, it is sufficient to arrange the spring element 6 without a fixed connection to the motor housing or the handle part, although it is possible to provide a fixed connection to one or both housing parts.
  • Fig. 4 There is a designed as a leaf spring spring element 9 in the axial intermediate region between the inside of the bottom 4a of the handle part 4 and the rear axial end side of the motor housing 2.
  • the spring element 9 is axially connected via the screw 10 with the motor housing 2.
  • the Federelemenf 9 has in its radially outer region a bent portion over which the spring element is connected via a further screw 11 with the radially inner side of the handle part 4.
  • the connection thus takes place in the region of the annular gap between the motor housing 2 and the inside of the grip part 4.
  • the connection can also be carried out via other connection measures, for example via a snap connection, by gluing, ultrasonic welding, etc.
  • the sliding element 7, which is arranged adjacent to the free end face of the grip part 4 on the lateral surface of the motor housing 2, may be dimensioned such that in a desired position the inside of the grip part 4 is at a distance from the sliding element 7, so that the sliding element 7 only at a radial deflection of the desired position comes into contact with the inside of the handle part 4.
  • Fig. 5 is arranged between the free axial end face of the handle part 4 and the motor housing 2 in the axial direction extending, expediently circumferential spring element 6, which is designed for example as a bellows or as a corrugated spring.
  • the spring element 6 is held on fastening parts 12 and 13, of which the fastening part 12 protrudes into a receiving pocket 14, which is formed on the motor housing 2 and is secured thereto, whereas the second fastening part 13 with the end face of the handle part 4th connected is.
  • the spring element is in the annular space between the outer surface of the motor housing 2 and the inside of the handle part 4.
  • the spring element 6 may be formed circumferentially or possibly extend in the circumferential direction only over a limited angular segment, in the latter case basically over the circumference distributed more spring element can be arranged in the annular space.
  • the spring element 6 is designed as a wave spring and transmits forces both in the axial direction and in the circumferential direction and in the radial direction.
  • the spring element 6 is connected via fastening parts 15 and 16 both with the inside of the handle part 4 and with the lateral surface of the motor housing 2.
  • the fastening parts 15, 16 may each be part of a bayonet closure to allow a simple change of the spring element 6.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)

Description

Die Erfindung bezieht sich auf eine Handwerkzeugmasehine 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

In der DE 10 2005 016 453 A1 wird eine als Winkelschleifer ausgeführte Elektrohandwerkzeugmaschine beschrieben, die in einem Motorgehäuse einen elektrischen Antriebsmotor aufweist. Zum Halten und Führen der Handwerkzeugmaschine ist an die hintere Stirnseite des Motorgehäuses ein topfförmiges Griffteil angeflanscht, wobei zwischen Motorgehäuse und Griffteil ein Dämpfungsring angeordnet ist, um Schwingungen und Vibrationen, die vom Antriebsmotor ausgehen oder bei der Bearbeitung eines Werkstückes entstehen, zu dämpfen.In the DE 10 2005 016 453 A1 is described as an angle grinder electric hand tool machine which has an electric drive motor in a motor housing. For holding and guiding the hand tool a cup-shaped handle part is flanged to the rear end side of the motor housing, wherein between the motor housing and handle part a damping ring is arranged to dampen vibrations and vibrations that emanate from the drive motor or arise during the machining of a workpiece.

Aus der DE 10 2006 027 774 A1 ist eine Handwerkzeugmaschine mit einem mehrteiligen Gehäuse bekannt, welches ein Innengehäuse sowie ein topfförmiges, das Innengehäuse übergreifendes Außengehäuse umfasst. In einem Ringraum zwischen der Außenseite des Innengehäuses und der Innenseite des Außengehäuses befinden sich Federelemente, welche einstückig mit dem Innengehäuse ausgebildet sind. Im Bereich des Bodens sind Innen- und Außengehäuse über ein Stellelement verbunden, welches dazu dient, die Vorspannung der Federelemente im Ringraum zwischen Innen- und Außengehäuse einzustellen. Das Stellelement wirkt auf eine Druckplatte, die mit dem Außengehäuse verbunden ist. Bei einer Betätigung des Stellelementes wird eine axiale Relativverschiebung zwischen Innen- und Außengehäuse erzeugt, was zu der gewünschten Einstellung der Vorspannung führt.From the DE 10 2006 027 774 A1 is a hand tool with a multi-part housing known which comprises an inner housing and a cup-shaped, the inner housing cross-outer housing. In an annular space between the outside of the inner housing and the inside of the outer housing are spring elements which are integrally formed with the inner housing. In the area of the bottom inner and outer housing are connected via an adjusting element, which serves to adjust the bias of the spring elements in the annular space between the inner and outer housing. The actuator acts on a pressure plate which is connected to the outer housing. Upon actuation of the actuator, an axial relative displacement between the inner and outer housing is generated, resulting in the desired adjustment of the bias voltage.

Offenbarung der ErfindungDisclosure of the invention

Der Erfindung liegt die Aufgabe zu Grunde, mit einfachen konstruktiven Maßnahmen eine wirkungsvolle Schwingungsreduzierung im Griffteil einer Handwerkzeugmaschine zu erreichen.The invention is based on the object to achieve an effective vibration reduction in the handle part of a power tool with simple constructive 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 bevorzugt um eine Elektrohandwerkzeugmaschine, deren Antriebseinheit als elektrischer Antriebsmotor ausgebildet ist, welcher in einem Motorgehäuse angeordnet ist. An das Motorgehäuse schließt sich ein Griffteil an, über das die Handwerkzeugmaschine gehalten und geführt wird. Zwischen dem Griffteil und einem weiteren Gehäuseteil - in der Regel das Motorgehäuse - befindet sich ein Schwingungsreduktionselement, welches die Aufgabe hat, Schwingungen und Vibrationen im Griffteil zu reduzieren.The hand tool according to the invention is preferably an electric hand tool, whose drive unit is designed as an electric drive motor, which is arranged in a motor housing. The motor housing is followed by a handle part, via which the power tool is held and guided. Between the handle part and another housing part - usually the motor housing - is a vibration reduction element, which has the task to reduce vibrations and vibrations in the handle.

Erfindungsgemäß ist das Schwingungsreduktionselement als ein Federelement ausgebildet, das in einem Zwischenraum zwischen dem Griffteil einerseits und dem weiteren Gehäuseteil andererseits angeordnet ist. Ein als separates Bauteil ausgeführtes Federelement als Schwingungsreduktionselement vorzusehen, hat den Vorteil, dass zum einen eine Abstützung des Griffteils an dem weiteren Gehäuseteil gegeben ist und zum andern Amplituden und Frequenzen der Schwingungen, welche von dem weiteren Gehäuseteil ausgehen, von kritischen zu unkritischen Werten verlagert werden, so dass die objektive und subjektive Schwingungsbelastung im Griffteil reduziert ist.According to the invention, the vibration reduction element is designed as a spring element, which is arranged in a space between the handle part on the one hand and the other housing part on the other. To provide a designed as a separate component spring element as a vibration reduction element, has the advantage that on the one hand a support of the handle part is given to the other housing part and the other amplitude and frequencies of the vibrations, which emanate from the other housing part, are shifted from critical to non-critical values , so that the objective and subjective vibration load is reduced in the handle part.

Grundsätzlich reicht es aus, zwischen dem Griffteil und dem weiteren Gehäuseteil ausschließlich ein oder mehrere Federelemente vorzusehen. Möglich ist es aber auch, zusätzlich als Schwingungsreduktionselemente Dämpfungselemente einzusetzen.In principle, it is sufficient to provide only one or more spring elements between the grip part and the further housing part. But it is also possible to additionally use damping elements as vibration reduction elements.

Als Federelement können verschiedene Federtypen verwendet werden, beispielsweise Blattfedern, Spiralfedern, Tellerfedern, Wellfedern, Membranfedern oder dergleichen. Das Federelement wird auf Grund seiner Ausführung als separates Bauteil im Zwischenraum zwischen dem Griffteil und dem weiteren Gehäuseteil zweckmäßigerweise zumindest mit einem der beteiligten Gehäuseteile verbunden, beispielsweise angeschraubt. Möglich ist es aber auch, das Federelement an einem oder an beiden Gehäuseteilen ohne weitere Befestigungsmaßnahme anliegen zu lassen, wobei in diesem Fall zweckmäßigerweise Anschläge, Vertiefungen oder sonstige Formschlusseinrichtungen vorgesehen sind, um das Federelement an einem oder an beiden Gehäuseteilen vorzugsweise formschlüssig in Achsrichtung, in Radialrichtung und/oder in Umfangsrichtung zu fixieren.As spring element different types of springs can be used, for example, leaf springs, coil springs, disc springs, corrugated springs, diaphragm springs or the like. The spring element is connected due to its design as a separate component in the space between the handle part and the other housing part expediently at least one of the housing parts involved, for example screwed. But it is also possible to rest on one or both housing parts without further fastening measure, the spring element expediently stops, depressions or other Formschlusseinrichtungen are provided to the spring element on one or both housing parts preferably form-fitting in the axial direction, in Radial direction and / or to fix in the circumferential direction.

Die Kraftübertragung erfolgt je nach Einbauort und Art des Federelementes in eine oder mehrere Achsrichtungen. Grundsätzlich möglich ist eine Kraftübertragung zwischen dem Griffteil und dem weiteren Gehäuseteil in Achsrichtung, also in Richtung der Längsachse der Handwerkzeugmaschine. Darüber hinaus kommt auch eine Abstützung des Griffteils in Radialrichtung sowie in Umfangsrichtung in Betracht.The power transmission takes place depending on the installation location and type of spring element in one or more axial directions. In principle, it is possible to transmit power between the grip part and the further housing part in the axial direction, that is to say in the direction of the longitudinal axis of the handheld power tool. In addition, comes Also, a support of the handle portion in the radial direction and in the circumferential direction into consideration.

Gemäß vorteilhafter Ausführung ist das Griffteil hohlzylindrisch oder topfförmig ausgebildet und auf das weitere Gehäuseteil aufgeschoben, wobei zwischen der Mantelfläche des weiteren Gehäuseteils und der Innenseite des Griffteils zweckmäßigerweise ein Ringraum gebildet ist, um einen unmittelbaren Kontakt zwischen den Wandungen von Griffteil und weiterem Gehäuseteil zu vermeiden. Auch im Bereich des Topfbodens bzw. der Stirnseite des weiteren Gehäuseteils kann ein Zwischenraum vorhanden sein, um auch an dieser Stelle einen direkten Kontakt und eine damit einhergehende unmittelbare Schwingungsübertragung zu verhindern.According to an advantageous embodiment, the handle part is formed as a hollow cylinder or pot-shaped and pushed onto the further housing part, between the outer surface of the further housing part and the inside of the handle expediently an annular space is formed in order to avoid direct contact between the walls of the handle part and further housing part. Also in the region of the pot bottom or the end face of the other housing part, a gap may be present to prevent direct contact and an accompanying direct vibration transmission at this point.

In bevorzugter Ausführung ist im Bereich der hinteren Stirnseite des weiteren Gehäuseteils und dem zugewandten Topfbodens des Griffteils ein erstes Federelement angeordnet, über das hauptsächlich Kräfte in Achsrichtung übertragen werden. Zumindest ein weiteres Federelement befindet sich im ringförmigen Zwischenraum zwischen Mantelfläche des weiteren Gehäuseteils und Innenseite des Griffteils, wobei über dieses weitere Federelement eine Abstützung in Radialrichtung und ggf. auch in Umfangsrichtung erreicht wird. Im Bereich der hinteren axialen Stirnseite des weiteren Gehäuseteils und dem Topfboden wird beispielsweise ein Blattfederelement eingesetzt, in den Zwischenraum zwischen äußerer Mantelfläche des Gehäuseteils und Innenseite des umgreifenden Griffteils kann entweder eine in Radialrichtung wirksame Spiralfeder oder ein gewelltes Federelement eingesetzt werden, das sich entweder über den gesamten Umfang oder über einen Teilwinkelbereich in Umfangsrichtung erstreckt. Auch an der freien Stirnseite des Griffteils kann ein vorzugsweise in Achsrichtung wirksames Federelement angeordnet sein, das sich an einem Absatz des weiteren Gehäuseteils abstützt und das sich ebenfalls entweder über den gesamten Umfang oder nur über ein begrenztes Winkelsegment in Umfangsrichtung erstreckt.In a preferred embodiment, a first spring element is arranged in the area of the rear end face of the further housing part and the facing pot bottom of the grip part, via which forces are mainly transmitted in the axial direction. At least one further spring element is located in the annular space between the lateral surface of the further housing part and the inside of the grip part, wherein support via this further spring element in the radial direction and possibly also in the circumferential direction is achieved. In the region of the rear axial end face of the other housing part and the pot bottom, for example, a leaf spring element is used, in the space between the outer surface of the housing part and the inside of the encompassing handle portion either a radially effective coil spring or a corrugated spring element can be used, either on the entire circumference or extends over a partial angle range in the circumferential direction. Also on the free end face of the handle portion, a preferably effective in the axial direction spring element may be arranged, which is supported on a shoulder of the further housing part and which also extends either over the entire circumference or only over a limited angular segment in the circumferential direction.

Gemäß einer weiteren vorteilhaften Ausführung ist zusätzlich zu dem mindestens einen Federelement zwischen dem Griffteil und dem Gehäuseteil ein Dämpfungselement angeordnet, das insbesondere die Funktion eines Gleitelementes übernimmt und eine Relativbewegung zwischen dem Griffteil und dem weiteren Gehäuseteil erlaubt. Das Gleitelement übernimmt eine Abstützfunktion in Radialrichtung, wobei auf Grund der dämpfenden Eigenschaften die von dem weiteren Gehäuseteil ausgehenden Schwingungen reduziert werden. Die Relativbewegung zwischen Griffteil und dem weiteren Gehäuseteil findet vorzugsweise in Achsrichtung und/oder in Umfangsrichtung statt, gegebenenfalls auch in Radialrichtung.According to a further advantageous embodiment, a damping element is arranged in addition to the at least one spring element between the handle part and the housing part, which in particular assumes the function of a sliding element and allows a relative movement between the handle part and the further housing part. The sliding element assumes a supporting function in the radial direction, wherein due to the damping properties, the vibrations emanating from the further housing part are reduced. The relative movement between the handle part and the further housing part preferably takes place in the axial direction and / or in the circumferential direction, optionally also in the radial direction.

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

Fig. 1
eine Handwerkzeugmaschine mit einem mehrteiligen Gehäuse, bestehend aus einem Motorgehäuse zur Aufnahme eines Antriebsmotors und einem Griffteil, welches topfförmig ausgebildet und auf das Motorgehäuse aufgeschoben ist, wobei in einem Ringraum zwischen der Mantelfläche des Motorgehäuses und der Innenseite des Griffteils ein als Federelement ausgeführtes Schwingungsreduktionselement angeordnet ist, mit einem zusätzlichen Dämpfungselement, das benachbart zur freien axialen Stirnseite des Griffteils angeordnet ist,
Fig. 2
ein weiteres Ausführungsbeispiel, mit einer Blattfeder zwischen dem Boden des topfförmigen Griffteils und der axialen hinteren Stirnseite des Motorgehäuses und einem zweiten Federelement im ringförmigen Zwischenraum, das sich in Umfangsrichtung erstreckt,
Fig. 3
das im ringförmigen Zwischenraum angeordnete Federelement aus Fig. 2 in einer Schnittdarstellung,
Fig. 4
ein weiteres Ausführungsbeispiel mit einem Blattfederelement zwischen dem Boden des Griffteils und der hinteren axialen Stirnseite des Motorgehäuses sowie einem Gleitelement im Ringraum zwischen Motorgehäuse und Griffteil,
Fig. 5
ein weiteres Ausführungsbeispiel mit einem Federelement zwischen der freien axialen Stirnseite des Griffteils und einem Absatz am Motorgehäuse,
Fig. 6
ein weiteres Ausführungsbeispiel mit einem als Wellfeder ausgebildeten Federelement im ringförmigen Zwischenraum zwischen Motorgehäuse und Griffteil.
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 hand tool with a multi-part housing, consisting of a motor housing for receiving a drive motor and a handle portion, which is cup-shaped and pushed onto the motor housing, wherein in an annular space between the outer surface of the motor housing and the inside of the handle portion designed as a spring element vibration reduction element is arranged with an additional damping element which is arranged adjacent to the free axial end side of the grip part,
Fig. 2
a further embodiment, with a leaf spring between the bottom of the pot-shaped handle portion and the axial rear end face of the motor housing and a second spring element in the annular space extending in the circumferential direction,
Fig. 3
the arranged in the annular space spring element Fig. 2 in a sectional view,
Fig. 4
a further embodiment with a leaf spring element between the bottom of the handle part and the rear axial end side of the motor housing and a sliding element in the annular space between the motor housing and the handle part,
Fig. 5
a further embodiment with a spring element between the free axial end face of the handle part and a shoulder on the motor housing,
Fig. 6
a further embodiment with a spring element designed as a wave spring in the annular space between the motor housing and handle part.

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 weist ein zweiteiliges Gehäuse 5 auf, bestehend aus einem Motorgehäuse 2 mit einem darin angeordneten elektrischen Antriebsmotor 3 und einem Griffteil 4, das topfförmig ausgebildet und auf das Motorgehäuse 2 aufgeschoben ist. Der Innendurchmesser des Griffteils 4 übersteigt den Außendurchmesser des Motorgehäuses 2, wodurch zwischen der Mantelfläche des Motorgehäuses 2 und der Innenseite des Griffteils 4 ein ringförmiger Zwischenraum gebildet ist. Auch der Boden 4a des Griffteils 4 liegt auf axialem Abstand zur hinteren axialen Stirnseite 2a des Motorgedies Weise soll ein direkter Kontakt zwischen dem Motorgehäuse 2 und Griffteil 4 vermieden werden, um sicherzustellen, dass Schwingungen und Vibrationen sich nur in einer reduzierten Weise vom Motorgehäuse 2 auf das Griffteil 4 ausbreiten können.In the Fig. 1 shown electric hand tool 1 has a two-part housing 5, consisting of a motor housing 2 with an electric drive motor 3 arranged therein and a handle part 4 which is cup-shaped and is pushed onto the motor housing 2. The inner diameter of the grip part 4 exceeds the outer diameter of the motor housing 2, whereby an annular space is formed between the outer surface of the motor housing 2 and the inner side of the grip part 4. Also, the bottom 4a of the handle part 4 is at an axial distance to the rear axial end 2a of the motor. Thus, direct contact between the motor housing 2 and the handle part 4 should be avoided to ensure that vibrations and vibrations only in a reduced manner from the motor housing 2 on can spread the handle part 4.

Das Griffteil 4 ist über ein Federelement 6, das im ringförmigen Zwischenraum zwischen Motorgehäuse 2 und Griffteil 4 angeordnet ist, am Motorgehäuse 2 abgestützt. Das Federelement 6 ist im Ausführungsbeispiel nach Fig. 1 als Spiralfeder oder ggf. auch als Wellfeder ausgebildet und erstreckt sich in Radialrichtung, bezogen auf die Längsachse 8 der Handwerkzeugmaschine 1. Das Federelement 6 stützt das Griffteil 4 in Radialrichtung am Motorgehäuse 2 ab. Gegebenenfalls wirkt das Federelement 6 auch zusätzlich in Umfangsrichtung und hält somit das Griffteil 4 in einer Soll-Winkellage bezüglich des Motorgehäuses 2.The grip part 4 is supported on the motor housing 2 via a spring element 6, which is arranged in the annular space between the motor housing 2 and the grip part 4. The spring element 6 is in the embodiment according to Fig. 1 formed as a spiral spring or possibly also as a wave spring and extends in the radial direction, relative to the longitudinal axis 8 of the power tool 1. The spring element 6 supports the grip part 4 in the radial direction on the motor housing 2 from. Optionally, the spring element 6 also acts in the circumferential direction and thus holds the grip part 4 in a desired angular position relative to the motor housing 2.

Das Federelement 6 befindet sich in Achsrichtung gesehen nahe zur freien Stirnseite des topfförmigen Griffteiles 4. Zur axialen Sicherung und Positionierung sind in die Mantelfläche des Motorgehäuses 2 sowie an der Innenseite des Griffteiles 4 jeweils Vertiefungen eingebracht, in die das Federelement 6 eingesetzt ist.For axial securing and positioning in the lateral surface of the motor housing 2 and on the inside of the handle part 4 are each recesses introduced into which the spring element 6 is inserted.

Über die axiale Länge verteilt sowie ggf. auch über den Umfang verteilt können mehrere derartiger Federelemente vorgesehen sein, um entsprechend das Griffteil 4 über dessen axiale Länge und den Umfang am Motorgehäuse 2 abzustützen.Distributed over the axial length and possibly also distributed over the circumference, a plurality of such spring elements may be provided to correspondingly the handle part Support 4 over the axial length and the circumference of the motor housing 2.

Unmittelbar benachbart zur freien Stirnseite ist das Griffteil 4 mit seiner Innenseite an einem Gleitelement 7 abgestützt, welches auf die Mantelfläche des Motorgehäuses 2 aufgebracht bzw. dort befestigt ist. Das Gleitelement 7 erlaubt eine Relativbewegung des Griffteils 4 gegenüber dem Motorgehäuse 2, und zwar sowohl Achs- als auch in Umfangsrichtung sowie ggf. auch in Radialrichtung. Das Gleitelement 7 übernimmt auch die Funktion eines Dämpfungselementes und besteht dementsprechend aus einem dämpfenden Material, um sicherzustellen, dass bei aufliegendem Griffteil 4 Schwingungen des Motorgehäuses in einer nur reduzierten Weise weitergeleitet werden. Bei dem Gleitelement 7 handelt es sich um ein optionales Bauteil, auf das ggf. auch verzichtet werden kann.Immediately adjacent to the free end face, the grip part 4 is supported with its inner side on a sliding element 7, which is applied to the outer surface of the motor housing 2 and fixed there. The sliding member 7 allows a relative movement of the handle part 4 relative to the motor housing 2, both axial and in the circumferential direction and possibly also in the radial direction. The sliding member 7 also assumes the function of a damping element and is accordingly made of a damping material to ensure that when the grip part 4 vibrations of the motor housing are forwarded in an only reduced manner. The sliding element 7 is an optional component which may possibly be dispensed with.

Auch im Ausführungsbeispiel gemäß Fig. 2 befindet sich im ringformigen Zwischenraum zwischen der Mantelfläche des Motorgehäuses 2 und der Innenseite des Griffteiles 4 ein Federelement 6, das aber, wie auch der Schnittdarstellung gemäß Fig. 3 zu entnehmen, als gewellte Blattfeder ausgeführt ist. Das Federelement 6 erstreckt sich in Umfangsrichtung, wobei sowohl Ausführungen mit einer sich nur über ein begrenztes Winkelsegment erstreckenden Blattfeder als auch eine ringförmige Blattfeder in Betracht kommen, bei der sich das Federelement über den gesamten Umfang erstreckt. Auf Grund der wellenförmigen Struktur der Blattfeder 6 liegen über den Umfang verteilt jeweils mehrere Federhügel und Federtäler an der Innenseite des Griffteiles 4 bzw. der Mantelfläche des Motorgehäuses 2 an.Also in the embodiment according to Fig. 2 is located in the annular space between the lateral surface of the motor housing 2 and the inside of the handle part 4, a spring element 6, but, as well as the sectional view according to Fig. 3 to be taken as a corrugated leaf spring is executed. The spring element 6 extends in the circumferential direction, wherein both embodiments with a only a limited angular segment extending leaf spring and an annular leaf spring come into consideration, in which the spring element extends over the entire circumference. Due to the wave-shaped structure of the leaf spring 6 are distributed over the circumference in each case a plurality of spring mounds and spring valleys on the inside of the handle part 4 and the lateral surface of the motor housing 2 at.

Analog zum vorhergehenden Ausführungsbeispiel befindet sich benachbart zur freien Stirnseite des Griffteiles 4 an der Mantelfläche des Motorgehäuses 2 ein Gleitelement 7, an welchem die Innenseite des Griffteiles 4 abgestützt ist. Auch dieses Gleitelement 7 ist optional vorhanden und kann ggf. weggelassen werden.Analogous to the previous embodiment is adjacent to the free end face of the handle part 4 on the lateral surface of the motor housing 2, a sliding member 7, on which the inside of the handle part 4 is supported. This sliding element 7 is optionally available and can be omitted if necessary.

Im axialen Zwischenraum zwischen dem Boden 4a des Griffteiles 4 und der hinteren axialen Stirnseite 2a des Motorgehäuses 2 befindet sich ein weiteres Federelement 9, das als Blattfeder ausgebildet und über eine Schraube 10 fest mit der hinteren Stirnseite des Motorgehäuses 2 verbunden ist. Über eine weitere Schraube 11 ist das Federelement 9 auch mit der Innenseite des Bodens 4a des Griffteiles 4 verbunden. Das Federelement 9 wirkt in erster Linie axial in Richtung der Längsachse 8, darüber hinaus aber auch in Radial- und Umfangsrichtung.In the axial space between the bottom 4a of the handle part 4 and the rear axial end 2a of the motor housing 2 is another spring element 9, which is formed as a leaf spring and connected by a screw 10 fixed to the rear end side of the motor housing 2. About a further screw 11, the spring element 9 is also connected to the inside of the bottom 4a of the Handle part 4 connected. The spring element 9 acts primarily axially in the direction of the longitudinal axis 8, but also in the radial and circumferential direction.

Das Federelement 6 im ringförmigen Zwischenraum ist in Vertiefungen in der Mantelfläche des Motorgehäuses 2 und an der Innenseite des Griffteiles 4 eingesetzt und dadurch in Achsrichtung fixiert. Grundsätzlich reicht es aus, das Federelement 6 ohne feste Verbindung zum Motorgehäuse oder zum Griffteil anzuordnen, wenngleich es möglich ist, auch eine feste Verbindung an einem oder an beiden Gehäuseteilen vorzusehen.The spring element 6 in the annular space is inserted into recesses in the lateral surface of the motor housing 2 and on the inside of the handle part 4 and thereby fixed in the axial direction. Basically, it is sufficient to arrange the spring element 6 without a fixed connection to the motor housing or the handle part, although it is possible to provide a fixed connection to one or both housing parts.

Auch im Ausführungsbeispiel nach Fig. 4 befindet sich ein als Blattfeder ausgeführtes Federelement 9 im axialen Zwischenbereich zwischen der Innenseite des Bodens 4a des Griffteiles 4 und der hinteren axialen Stirnseite des Motorgehäuses 2. Das Federelement 9 ist über die Schraube 10 mit dem Motorgehäuse 2 axial verbunden. Das Federelemenf 9 besitzt in seinem radial außen liegenden Bereich einen umgebogenen Abschnitt, über den das Federelement über eine weitere Schraube 11 mit der radialen Innenseite des Griffteiles 4 verbunden ist. Die Verbindung erfolgt somit im Bereich des ringförmigen Zwischenraums zwischen Motorgehäuse 2 und Innenseite des Griffteils 4. Die Verbindung kann auch über sonstige Verbindungsmaßnahmen durchgeführt werden, beispielsweise über eine Schnappverbindung, durch Kleben, Ultraschallverschweißen etc.Also in the exemplary embodiment Fig. 4 There is a designed as a leaf spring spring element 9 in the axial intermediate region between the inside of the bottom 4a of the handle part 4 and the rear axial end side of the motor housing 2. The spring element 9 is axially connected via the screw 10 with the motor housing 2. The Federelemenf 9 has in its radially outer region a bent portion over which the spring element is connected via a further screw 11 with the radially inner side of the handle part 4. The connection thus takes place in the region of the annular gap between the motor housing 2 and the inside of the grip part 4. The connection can also be carried out via other connection measures, for example via a snap connection, by gluing, ultrasonic welding, etc.

Das Gleitelement 7, welches benachbart zur freien Stirnseite des Griffteiles 4 auf der Mantelfläche des Motorgehäuses 2 angeordnet ist, kann so dimensioniert sein, dass in einer Solllage die Innenseite des Griffteils 4 auf Abstand zu dem Gleitelement 7 liegt, so dass das Gleitelement 7 nur bei einer radialen Auslenkung aus der Solllage in Kontakt mit der Innenseite des Griffteiles 4 kommt.The sliding element 7, which is arranged adjacent to the free end face of the grip part 4 on the lateral surface of the motor housing 2, may be dimensioned such that in a desired position the inside of the grip part 4 is at a distance from the sliding element 7, so that the sliding element 7 only at a radial deflection of the desired position comes into contact with the inside of the handle part 4.

Im Ausführungsbeispiel nach Fig. 5 ist zwischen der freien axialen Stirnseite des Griffteiles 4 und dem Motorgehäuse 2 ein sich in Achsrichtung erstreckendes, zweckmäßigerweise umlaufendes Federelement 6 angeordnet, welches beispielsweise als Faltenbalg oder als Wellfeder ausgeführt ist. An seinen axialen Stirnseiten ist das Federelement 6 an Befestigungsteilen 12 und 13 gehalten, von denen das Befestigungsteil 12 in eine Aufnahmetasche 14 einragt, die am Motorgehäuse 2 ausgebildet ist bzw. an diesem befestigt ist, wohingegen das zweite Befestigungsteil 13 mit der Stirnseite des Griffteiles 4 verbunden ist.In the embodiment according to Fig. 5 is arranged between the free axial end face of the handle part 4 and the motor housing 2 in the axial direction extending, expediently circumferential spring element 6, which is designed for example as a bellows or as a corrugated spring. At its axial end faces, the spring element 6 is held on fastening parts 12 and 13, of which the fastening part 12 protrudes into a receiving pocket 14, which is formed on the motor housing 2 and is secured thereto, whereas the second fastening part 13 with the end face of the handle part 4th connected is.

Im Ausführungsbeispiel gemäß Fig. 6 befindet sich das Federelement im ringförmigen Zwischenraum zwischen der äußeren Mantelfläche des Motorgehäuses 2 und der Innenseite des Griffteils 4. Das Federelement 6 kann umlaufend ausgebildet sein oder ggf. sich in Umfangsrichtung auch nur über ein begrenztes Winkelsegment erstrecken, wobei in letzterem Fall grundsätzlich über den Umfang verteilt mehrere Federelementes im Ringraum angeordnet sein können. Das Federelement 6 ist als Wellfeder ausgebildet und überträgt Kräfte sowohl in Achsrichtung als auch in Umfangsrichtung und in Radialrichtung. Das Federelement 6 ist über Befestigungsteile 15 und 16 sowohl mit der Innenseite des Griffteils 4 als auch mit der Mantelfläche des Motorgehäuses 2 verbunden. Die Befestigungsteile 15, 16 können jeweils Teil eines Bajonettverschlusses sein, um in einfacher Weise einen Wechsel des Federelementes 6 zu erlauben.In the embodiment according to Fig. 6 the spring element is in the annular space between the outer surface of the motor housing 2 and the inside of the handle part 4. The spring element 6 may be formed circumferentially or possibly extend in the circumferential direction only over a limited angular segment, in the latter case basically over the circumference distributed more spring element can be arranged in the annular space. The spring element 6 is designed as a wave spring and transmits forces both in the axial direction and in the circumferential direction and in the radial direction. The spring element 6 is connected via fastening parts 15 and 16 both with the inside of the handle part 4 and with the lateral surface of the motor housing 2. The fastening parts 15, 16 may each be part of a bayonet closure to allow a simple change of the spring element 6.

Claims (12)

  1. Hand-held power tool, in particular an electric hand-held power tool, comprising a housing (5) which has at least two separate housing parts (2, 4) to be connected to one another, wherein one housing part is designed as a handle part (4) for holding and guiding the hand-held power tool (1), wherein the handle part (4) is of pot-shaped design and encloses the further housing part (2), wherein there is arranged a vibration reduction element (6) which interacts with at least one housing part (2, 4), which vibration reduction element is designed as a separate spring element (6) and is arranged in an annular space which lies between the inner side of the handle part (4) and the outer side of the further housing part (2) enclosed by the handle part, characterized in that in the space between the handle part (4) and a further housing part (2), a further spring element (9) is arranged in the region of the pot base (4a) or acts on the pot base (4a).
  2. Hand-held power tool according to Claim 1, characterized in that the spring element (6, 9) is designed as a leaf spring.
  3. Hand-held power tool according to Claim 2, characterized in that the leaf spring (6) forms a spring ring which is put around a housing part (2, 4).
  4. Hand-held power tool according to one of Claims 1 to 3, characterized in that the spring element (6) is designed as a helical spring.
  5. Hand-held power tool according to one of Claims 1 to 4, characterized in that the spring element (6, 9) is active in the direction of the housing longitudinal axis.
  6. Hand-held power tool according to one of Claims 1 to 5, characterized in that the spring element (6, 9) is active in the circumferential direction.
  7. Hand-held power tool according to one of Claims 1 to 6, characterized in that the spring element (6, 9) is active in the radial direction.
  8. Hand-held power tool according to one of Claims 1 to 7, characterized in that the housing part interacting with the handle part (4) forms a motor housing (2) for accommodating a drive motor (3).
  9. Hand-held power tool according to one of Claims 1 to 8, characterized in that a damping element (7) is arranged between the handle part (4) and the further housing part (2).
  10. Hand-held power tool according to Claim 9, characterized in that the damping element (7) is arranged between the inner side of the handle part (4) and the outer side of the further housing part (2).
  11. Hand-held power tool according to Claim 9 or 10, characterized in that the damping element forms a sliding element (7) which is connected to one of the housing parts (2, 4) and permits a relative movement of the other housing part.
  12. Hand-held power tool housing of a hand-held power tool according to one of Claims 1 to 11.
EP10713918.0A 2009-05-11 2010-04-12 Hand-held power tool, in particular electric hand-held power tool Not-in-force EP2429770B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009002975A DE102009002975A1 (en) 2009-05-11 2009-05-11 Hand tool machine, in particular electric hand tool machine
PCT/EP2010/054740 WO2010130512A1 (en) 2009-05-11 2010-04-12 Hand-held power tool, in particular electric hand-held power tool

Publications (2)

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EP2429770A1 EP2429770A1 (en) 2012-03-21
EP2429770B1 true EP2429770B1 (en) 2016-03-30

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US (1) US20120125648A1 (en)
EP (1) EP2429770B1 (en)
CN (1) CN102421567A (en)
DE (1) DE102009002975A1 (en)
WO (1) WO2010130512A1 (en)

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CN102421567A (en) 2012-04-18
DE102009002975A1 (en) 2010-11-18
WO2010130512A1 (en) 2010-11-18
US20120125648A1 (en) 2012-05-24
EP2429770A1 (en) 2012-03-21

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