EP1320446B1 - Machine tool with a chamber for lubricating agent and a pressure equalisation device for said chamber - Google Patents

Machine tool with a chamber for lubricating agent and a pressure equalisation device for said chamber Download PDF

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Publication number
EP1320446B1
EP1320446B1 EP01969266A EP01969266A EP1320446B1 EP 1320446 B1 EP1320446 B1 EP 1320446B1 EP 01969266 A EP01969266 A EP 01969266A EP 01969266 A EP01969266 A EP 01969266A EP 1320446 B1 EP1320446 B1 EP 1320446B1
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EP
European Patent Office
Prior art keywords
bearing
pressure
power tool
tool according
chamber
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP01969266A
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German (de)
French (fr)
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EP1320446A1 (en
Inventor
Helmut Lebisch
Otto Baumann
Rolf Mueller
Dietmar Saur
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP1320446A1 publication Critical patent/EP1320446A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D17/26—Lubricating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/185—Pressure equalising means between sealed chambers

Definitions

  • the invention relates to a machine tool with a space with lubricant and a pressure compensation device of the space according to the preamble of claim 1.
  • the rotary hammer has a arranged in an engine compartment of a housing drive motor with a motor shaft which extends through a housing part into a gear housing and is there via a molded pinion with a gear for driving a tool holder is engaged.
  • the gear compartment is provided with a pressure compensation device, which degrades a pressure occurring in the gear compartment during operation to the atmosphere or the engine compartment.
  • the pressure compensation device has a bore leading from the gear housing to the outside or to the engine compartment and a constantly rotating driven element in the form of a cap in which a passage is introduced.
  • the invention relates to a machine tool, according to the preamble of claim 1 of a hand-held hammer drill, with a space with lubricant and a pressure compensation device of the space in the region of a bearing of a rotationally driven.
  • the rotationally driven component forms a drive or intermediate shaft.
  • a lubricant seal designed as a gap seal, which is arranged between the bearing and a bearing seat, wherein the gap seal can be arranged between an outer ring and / or between an inner ring of the bearing and a bearing seat.
  • the lubricant seal which is simultaneously usable for pressure compensation, is formed by a channel through the bearing, for example, by a channel through a cage of a rolling bearing and / or by bearing washers attached to the bearing.
  • the bearing and the bearing seat made of different materials with different thermal expansion coefficients formed and these are used to produce the lubricant seal, and that is advantageous, the bearing seat made of aluminum or an aluminum alloy and the bearing formed from a steel. If an outer bearing seat is made of a material having a larger coefficient of thermal expansion than the bearing, as is advantageous in the case of an aluminum bearing seat and a steel bearing, the bearing seat expands more when heated, and there is a gap between the bearing and the bearing seat a, which can be used advantageously as a gap seal.
  • an aluminum-steel combination other material combinations that appear appropriate to the person skilled in the art are also conceivable.
  • this is advantageously fixed in the bearing seat in the circumferential direction.
  • This can be achieved by various frictional, positive and / or material connections, for example by a pin connection, a tongue and groove connection and / or a form-locking connection by an outer ring of the bearing has a deviating from a round outer contour outer contour, etc.
  • a pressure equalization channel is introduced in a bearing surface of the bearing and / or in a bearing surface of the bearing seat. It can be structurally simply achieved an advantageous cross section for pressure equalization and at the same time a gap seal and / or labyrinth seal can be realized.
  • the pressure equalization channel can be introduced, for example, in the form of an axial groove in a shaft, in an inner ring of a rolling bearing, an outer ring of a rolling bearing and / or in an outer bearing seat forming component, etc.
  • the pressure equalization channel is at least partially formed by a thread-shaped depression, an advantageous labyrinth effect or labyrinth seal can be achieved and, moreover, a return effect can be achieved, namely by matching the thread direction and direction of rotation accordingly.
  • the thread-like depression can in turn be introduced into the bearing and / or into a bearing seat. If the pressure equalization channel opens into at least one annular groove, this can be produced in a particularly simple and cost-effective manner, for example in a turning process, starting from a first annular groove and opening into a second annular groove.
  • a filter element is connected in series with the lubricant seal formed at least partially by the bearing. At the same time ensuring the pressure compensation function, the sealing effect can be improved.
  • a filter element is particularly suitable a felt seal, which is particularly inexpensive to produce and has advantageous, proven properties.
  • the felt element can by different, The fibrous materials appear to be useful to those skilled in the art, such as in particular from animal hair, vegetable fibers and / or synthetic fibers, etc.
  • the filter element is advantageously fixed in its position by a component which fixes a bearing.
  • an advantageously large filter volume can be achieved by branching off from the bearing at least two radial pressure equalization channels, in particular by the bearing is surrounded by an annular filter element, and the pressure equalization channels open from the bearing radially outward on the filter element.
  • the solution according to the invention can be used in all machine tools that appear appropriate to a person skilled in the art, in particular in handheld power tools, such as, for example, grinding machines, saws, milling machines, planers, drills, chisel hammers, etc.
  • Fig. 1 shows a drill hammer shown schematically with a housing 104 in which in a motor space 56, a drive motor 58 is mounted.
  • a tool holder 60 and a drill 62 fixed in the tool holder 60 can be driven in rotation and in a hammering manner by way of a gear unit 10, which is not shown in more detail.
  • the hammer drill can be guided with two, 64 extending substantially perpendicular to an actuating direction handles 64, 66, wherein a handle 64 is formed on a side facing away from the drill bit 62 to the housing 104, and a handle 66 on a drill 62 facing side is attached to the housing 104.
  • the drive motor 58 has a drive shaft 68, on which in the engine compartment 56, a fan 80 is arranged rotationally fixed ( Fig. 2 ).
  • the drive shaft 68 protrudes from the engine compartment 56 through an intermediate wall 70 made of aluminum in the gear chamber 10 and is rotatably mounted in the intermediate wall 70 in a ball bearing 48.
  • the ball bearing 48 is connected with its outer ring 72 via a press fit with the intermediate wall 70 and is rotatably connected with its inner ring 74 via a press fit with the drive shaft 68.
  • the ball bearing 48 is designed as a fixed bearing, and this is supported axially in the direction of the gear housing 10 at a shoulder 78 in the intermediate wall 70 and axially toward the engine compartment 56 to a retaining wall 32 fixed in the intermediate wall 70.
  • the lubricant-filled gear chamber 10 is sealed at the ball bearing 48 via a sealing washer 76 in the direction of the engine compartment 56 air and lubricant tight.
  • a pinion 82 is formed, with which the drive shaft 68 with a rotatably mounted on an intermediate shaft 20 of the transmission, not shown gear meshes.
  • the intermediate shaft 20 is rotatably supported by a ball bearing 16 in the intermediate wall 70.
  • the ball bearing 16 is designed as a fixed bearing, and this is supported axially towards the engine compartment 56 at a shoulder 88 in the intermediate wall 70 and axially in weight gear chamber 10 via a non-illustrated, fixed in the intermediate wall 70 holding member.
  • the ball bearing 16 forms part of a lubricant seal 24 of a pressure compensation device 12, via which the pressure in the gear chamber 10 compensated or a pressure build-up in the gear chamber 10 during operation of the hammer drill can be reliably avoided by heating.
  • the ball bearing 16 is rotationally fixed with its inner ring 84 via a press fit connected to the intermediate shaft 20. Furthermore, the ball bearing 16 is introduced with its outer ring 86 made of steel via a sliding fit into a bearing seat 28 formed by the intermediate wall 70. If the hammer drill is operated, the ball bearing 16 and the intermediate wall 70 is heated. Due to their different thermal expansion coefficients, the intermediate wall 70 made of aluminum expands more than the ball bearing 16 made of steel.
  • a bearing gap between the inner ring 84 and the outer ring 86 of the ball bearing 16 is sealed by a sealing ring 90 air and lubricant tight.
  • a filter element 46 formed by a felt ring is connected in series.
  • the filter element 46 is inserted into a recess 94 surrounding the ball bearing 48 of the intermediate wall 70 and is held by the retaining ring 32 in its position.
  • a bore 92 is coaxially inserted to the intermediate shaft 20, which conceals in the direction of the engine compartment 56 from the filter element 46 is and over the pressure difference between the gear chamber 10 and the engine compartment 56 can be compensated.
  • FIG. 3 is a variant too Fig. 2 shown with a pressure compensation device 14.
  • Fig. 3 is a variant too Fig. 2 shown with a pressure compensation device 14.
  • Essentially identical components are numbered in the illustrated embodiments in principle with the same reference numerals.
  • a drive shaft 22 of a drive motor 58 is mounted via a ball bearing 18 in an intermediate wall 106.
  • the ball bearing 18 according to the invention forms part of a lubricant seal 26 of the pressure compensation device 14, via which the pressure in a gear chamber 10 can be compensated.
  • the ball bearing 18 is rotatably connected with its inner ring 96 via a press fit with the drive shaft 22.
  • the ball bearing 18 is introduced with its outer ring 98 made of steel via a sliding fit into a bearing seat 30 formed by the intermediate wall 106.
  • the ball bearing 18 and the intermediate wall 106 are heated. Due to their different coefficients of thermal expansion, the intermediate wall 106 of aluminum expands more than the steel ball bearing 18.
  • a felt ring filter element 46 To the adjusting between the outer ring 98 and the intermediate wall 106 gap seal formed by a felt ring filter element 46 is connected in series.
  • the filter element 46 is inserted into a recess 94 surrounding the ball bearing 18 in the intermediate wall 106 and is held in its position by the retaining ring 32. From the outer ring 98 of the ball bearing 18 extend four uniformly distributed over the circumference, introduced into the intermediate wall 106 radial pressure equalization channels 50, 52 which open radially outward on the filter element 46.
  • An intermediate shaft 20 of a transmission in the transmission 10 not shown in detail is mounted on a ball bearing 100 in the intermediate wall 106.
  • the intermediate wall 106 is sealed in the region of the ball bearing 100 from the gear chamber 10 in the direction of the engine compartment 56.
  • an intermediate shaft 54 is rotatably supported via a ball bearing 36 in an intermediate wall 70.
  • the ball bearing 36 according to the invention forms part of a lubricant seal 38 of a pressure compensation device 34, over which the pressure in a gear chamber 10 can be compensated.
  • the ball bearing 36 is arranged with its inner ring 84 via a press fit on a bearing seat 40 of the intermediate shaft 54 rotatably. Further, the ball bearing 36 is introduced with its outer ring 86 made of steel via a press fit in a bearing seat 102 formed by the intermediate wall 70.
  • a pressure equalization channel 42 formed by a thread-shaped depression is introduced, which opens into an annular groove 44 counter to a venting direction of the gear chamber 10.
  • the pressure compensation channel 42 forms a labyrinth seal and also has a return effect of the lubricant during operation.
  • a bearing gap between the inner ring 84 and the outer ring 86 of the ball bearing 36 is sealed by a sealing ring 90 air and lubricant tight.

Abstract

The invention relates to a machine tool, in particular a hand-operated hammer drill, comprising a chamber (10) with lubricating agent and a pressure equalising device (12, 14, 34) for the chamber (10), in the region of a bearing (16, 18, 36) for a rotating driven component (20, 22, 54). According to the invention, the bearing (16, 18, 36) forms at least part of a lubricating agent seal (24, 26, 38) for the pressure equalisation device (12, 14, 34), by means of which a pressure in the chamber (10) may be equilibrated.

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einer Werkzeugmaschine mit einem Raum mit Schmiermittel und einer Druckausgleichseinrichtung des Raums nach dem Oberbegriff des Anspruchs 1.The invention relates to a machine tool with a space with lubricant and a pressure compensation device of the space according to the preamble of claim 1.

Aus der DE 42 31 987.0 A1 ist eine gattungsbildende Werkzeugmaschine, insbesondere ein handgeführter Bohrhammer, bekannt. Der Bohrhammer besitzt einen in einem Motorraum eines Gehäuses angeordneten Antriebsmotor mit einer Motorwelle, die sich durch ein Gehäuseteil hindurch in einen Getrieberaum erstreckt und dort über ein angeformtes Ritzel mit einem Getriebe zum Antrieb einer Werkzeugaufnahme in Eingriff steht. Der Getrieberaum ist mit einer Druckausgleichseinrichtung versehen, die einen im Getrieberaum im Betrieb entstehenden Druck zur Atmosphäre oder zum Motorraum hin abbaut. Die Druckausgleichseinrichtung besitzt eine vom Getrieberaum nach außen bzw. zum Motorraum führende Bohrung sowie ein ständig umlaufend angetriebenes Rotationselement in Form einer Abdeckkappe, in die ein Durchlaß eingebracht ist.From the DE 42 31 987.0 A1 is a generic machine tool, in particular a hand-held rotary hammer, known. The rotary hammer has a arranged in an engine compartment of a housing drive motor with a motor shaft which extends through a housing part into a gear housing and is there via a molded pinion with a gear for driving a tool holder is engaged. The gear compartment is provided with a pressure compensation device, which degrades a pressure occurring in the gear compartment during operation to the atmosphere or the engine compartment. The pressure compensation device has a bore leading from the gear housing to the outside or to the engine compartment and a constantly rotating driven element in the form of a cap in which a passage is introduced.

Vorteile der ErfindungAdvantages of the invention

Die Erfindung geht aus von einer Werkzeugmaschine, gemäß dem Oberbegriff des Anspruchs 1 von einem handgeführten Bohrhammer, mit einem Raum mit Schmiermittel und einer Druckausgleichseinrichtung des Raums im Bereich eines Lagers einer rotierend antreibbaren.The invention relates to a machine tool, according to the preamble of claim 1 of a hand-held hammer drill, with a space with lubricant and a pressure compensation device of the space in the region of a bearing of a rotationally driven.

Erfindungsgemäß wird vorgeschlagen, daß das rotierend antriebbare Bauteil eine Antriebs- oder Zwischenwellebildet.According to the invention it is proposed that the rotationally driven component forms a drive or intermediate shaft.

Zusätzliche Bauteile, Bauraum, Gewicht, Montageaufwand und Kosten könnten eingespart werden. Besonders konstruktiv einfach und kostengünstig kann dies mit einer als Spaltdichtung ausgeführten Schmiermitteldichtung erreicht werden, die zwischen dem Lager und einem Lagersitz angeordnet ist, wobei die Spaltdichtung zwischen einem Außenring und/oder zwischen einem Innenring des Lagers und einem Lagersitz angeordnet sein kann. Ferner ist denkbar, daß die Schmiermitteldichtung, die gleichzeitig zum Druckausgleich nutzbar ist, von einem Kanal durch das Lager gebildet ist, beispielsweise von einem Kanal durch einen Käfig eines Wälzlagers und/oder durch entsprechend am Lager befestigte Lagerdichtscheiben.Additional components, space, weight, installation costs and costs could be saved. This can be achieved in a structurally simple and cost-effective manner with a lubricant seal designed as a gap seal, which is arranged between the bearing and a bearing seat, wherein the gap seal can be arranged between an outer ring and / or between an inner ring of the bearing and a bearing seat. Furthermore, it is conceivable that the lubricant seal, which is simultaneously usable for pressure compensation, is formed by a channel through the bearing, for example, by a channel through a cage of a rolling bearing and / or by bearing washers attached to the bearing.

In einer weiteren Ausgestaltung der Erfindung wird vorgeschlagen, daß das Lager und der Lagersitz aus verschiedenen Materialien mit unterschiedlichen Wärmeausdehnungskoeffizienten gebildet und diese zur Erzeugung der Schmiermitteldichtung genutzt sind, und zwar ist vorteilhaft der Lagersitz aus Aluminium oder einer Aluminiumlegierung und das Lager aus einem Stahl gebildet. Ist ein äußerer Lagersitz aus einem Material mit einem größeren Wärmeausdehnungskoeffizienten gebildet als das Lager, wie dies vorteilhaft bei einem Aluminiumlagersitz und einem Stahllager der Fall ist, dehnt sich der Lagersitz bei Erwärmung stärker aus, und es stellt sich ein Spalt zwischen dem Lager und dem Lagersitz ein, der vorteilhaft als Spaltdichtung nutzbar ist. Anstatt eine Aluminium-Stahlkombination sind auch andere, dem Fachmann als sinnvoll erscheinende Materialkombinationen denkbar.In a further embodiment of the invention, it is proposed that the bearing and the bearing seat made of different materials with different thermal expansion coefficients formed and these are used to produce the lubricant seal, and that is advantageous, the bearing seat made of aluminum or an aluminum alloy and the bearing formed from a steel. If an outer bearing seat is made of a material having a larger coefficient of thermal expansion than the bearing, as is advantageous in the case of an aluminum bearing seat and a steel bearing, the bearing seat expands more when heated, and there is a gap between the bearing and the bearing seat a, which can be used advantageously as a gap seal. Instead of an aluminum-steel combination, other material combinations that appear appropriate to the person skilled in the art are also conceivable.

Um dabei eine ungewünschte Rotationsbewegung des Lagers im Lagersitz zu vermeiden, wird dieses vorteilhaft im Lagersitz in Umfangsrichtung fixiert. Dies kann durch verschiedene kraftschlüssige, formschlüssige und/oder stoffschlüssige Verbindungen erreicht werden, beispielsweise durch eine Stiftverbindung, eine Feder-Nutverbindung und/oder eine Formschlußverbindung, indem ein Außenring des Lagers eine von einer runden Außenkontur abweichende Außenkontur aufweist usw. Ist das Lager als Festlager ausgebildet und ein das Lager in axialer Richtung fixierendes Bauteil ist zur Fixierung des Lagers in Umfangsrichtung genutzt, können vorteilhaft zusätzliche Bauteile, Bauraum und Montageaufwand eingespart werden, beispielsweise kann dies mit einem Klammerbauteil erreicht werden, das das Lager in axialer Richtung fixiert, das drehfest gesichert ist und mit einem Vorsprung in eine Ausnehmung eines Außenrings des Lagers greift.In order to avoid unwanted rotational movement of the bearing in the bearing seat, this is advantageously fixed in the bearing seat in the circumferential direction. This can be achieved by various frictional, positive and / or material connections, for example by a pin connection, a tongue and groove connection and / or a form-locking connection by an outer ring of the bearing has a deviating from a round outer contour outer contour, etc. Is the camp as a fixed bearing formed and a bearing in the axial direction-fixing component is used to fix the bearing in the circumferential direction, additional components, space and installation costs can be advantageously saved, for example, this can be achieved with a clamp member which fixes the bearing in the axial direction, the rotationally secured is and engages with a projection in a recess of an outer ring of the bearing.

In einer weiteren Ausgestaltung der Erfindung wird vorgeschlagen, daß in eine Lagerfläche des Lagers und/oder in eine Lagerfläche des Lagersitzes ein Druckausgleichskanal eingebracht ist. Es kann konstruktiv einfach ein vorteilhafter Querschnitt zum Druckausgleich erreicht und gleichzeitig eine Spaltdichtung und/oder Labyrinthdichtung realisiert werden. Der Druckausgleichskanal kann dabei beispielsweise in der Form einer Axialnut in eine Welle, in einen Innenring eines Wälzlagers, einen Außenring eines Wälzlagers und/oder in ein einen äußeren Lagersitz bildendes Bauteil eingebracht sein usw.In a further embodiment of the invention it is proposed that in a bearing surface of the bearing and / or in a bearing surface of the bearing seat, a pressure equalization channel is introduced. It can be structurally simply achieved an advantageous cross section for pressure equalization and at the same time a gap seal and / or labyrinth seal can be realized. The pressure equalization channel can be introduced, for example, in the form of an axial groove in a shaft, in an inner ring of a rolling bearing, an outer ring of a rolling bearing and / or in an outer bearing seat forming component, etc.

Ist der Druckausgleichskanal zumindest teilweise von einer gewindeförmigen Vertiefung gebildet, kann eine vorteilhafte Labyrinthwirkung bzw. Labyrinthdichtung erreicht und zudem kann eine Rückförderwirkung erzielt werden, und zwar indem Gewinderichtung und Drehrichtung entsprechend aufeinander abgestimmt werden. Die gewindeförmige Vertiefung kann wiederum ins Lager und/oder in einen Lagersitz eingebracht sein. Mündet der Druckausgleichskanal in zumindest einer Ringnut, kann dieser besonders einfach und kostengünstig hergestellt werden, beispielsweise in einem Drehvorgang, ausgehend von einer ersten Ringnut und mündend in einer zweiten Ringnut.If the pressure equalization channel is at least partially formed by a thread-shaped depression, an advantageous labyrinth effect or labyrinth seal can be achieved and, moreover, a return effect can be achieved, namely by matching the thread direction and direction of rotation accordingly. The thread-like depression can in turn be introduced into the bearing and / or into a bearing seat. If the pressure equalization channel opens into at least one annular groove, this can be produced in a particularly simple and cost-effective manner, for example in a turning process, starting from a first annular groove and opening into a second annular groove.

Vorteilhaft ist ein Filterelement zur vom Lager zumindest teilweise gebildeten Schmiermitteldichtung in Reihe geschaltet. Bei gleichzeitiger Gewährleistung der Druckausgleichsfunktion kann die Dichtwirkung verbessert werden. Als Filterelement eignet sich besonders eine Filzdichtung, die besonders kostengünstig herstellbar ist und vorteilhafte, bewährte Eigenschaften besitzt. Das Filzelement kann durch verschiedene, dem Fachmann als sinnvoll erscheinende faserförmige Materialien gebildet sein, wie insbesondere aus Tierhaaren, pflanzlichen Fasern und/oder Kunstfasern usw. Um zusätzliche Haltebauteile einzusparen, ist das Filterelement vorteilhaft durch ein ein Lager fixierendes Bauteil in seiner Lage fixiert.Advantageously, a filter element is connected in series with the lubricant seal formed at least partially by the bearing. At the same time ensuring the pressure compensation function, the sealing effect can be improved. As a filter element is particularly suitable a felt seal, which is particularly inexpensive to produce and has advantageous, proven properties. The felt element can by different, The fibrous materials appear to be useful to those skilled in the art, such as in particular from animal hair, vegetable fibers and / or synthetic fibers, etc. In order to save additional holding components, the filter element is advantageously fixed in its position by a component which fixes a bearing.

Ferner kann bei einer platzsparenden Konstruktion ein vorteilhaft großes Filtervolumen erreicht werden, indem vom Lager zumindest zwei radiale Druckausgleichskanäle abzweigen, und zwar insbesondere indem das Lager von einem ringförmigen Filterelement umgeben ist, und die Druckausgleichskanäle vom Lager radial nach außen am Filterelement münden.Further, in a space-saving design, an advantageously large filter volume can be achieved by branching off from the bearing at least two radial pressure equalization channels, in particular by the bearing is surrounded by an annular filter element, and the pressure equalization channels open from the bearing radially outward on the filter element.

Die erfindungsgemäße Lösung kann bei sämtlichen, dem Fachmann als sinnvoll erscheinenden Werkzeugmaschinen eingesetzt werden, insbesondere bei Handwerkzeugmaschinen, wie beispielsweise bei Schleifmaschinen, Sägen, Fräsen, Hobel, Bohrmaschinen, Meißelhämmer usw.The solution according to the invention can be used in all machine tools that appear appropriate to a person skilled in the art, in particular in handheld power tools, such as, for example, grinding machines, saws, milling machines, planers, drills, chisel hammers, etc.

Zeichnungdrawing

Weitere Vorteile ergeben sich aus der folgenden Zeichnungsbeschreibung. In der Zeichnung sind Ausführungsbeispiele der Erfindung dargestellt. Die Zeichnung, die Beschreibung und die Ansprüche enthalten zahlreiche Merkmale in Kombination. Der Fachmann wird die Merkmale zweckmäßigerweise auch einzeln betrachten und zu sinnvollen weiteren Kombinationen zusammenfassen.Further advantages emerge from the following description of the drawing. In the drawings, embodiments of the invention are shown. The drawing, the description and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into meaningful further combinations.

Es zeigen:

Fig. 1
einen schematisch dargestellten Bohrhammer von der Seite,
Fig. 2
einen mit II gekennzeichneten Ausschnitt aus Fig. 1,
Fig. 3
eine Variante zu Fig. 2 mit radial nach außen verlaufenden Druckausgleichskanälen und
Fig. 4
eine Variante zu Fig. 2 mit einem gewindeför- migen Druckausgleichskanal.
Show it:
Fig. 1
a drill hammer shown schematically from the side,
Fig. 2
a section marked II Fig. 1 .
Fig. 3
a variant too Fig. 2 with radially outwardly extending pressure equalization channels and
Fig. 4
a variant too Fig. 2 with a thread-shaped pressure compensation channel.

Beschreibung der AusführungsbeispieleDescription of the embodiments

Fig. 1 zeigt einen schematisch dargestellten Bohrhammer mit einem Gehäuse 104, in dem in einem Motorraum 56 ein Antriebsmotor 58 gelagert ist. Mit dem Antriebsmotor 58 ist über ein in einem Getrieberaum 10 angeordnetes, nicht näher dargestelltes Getriebe eine Werkzeughalterung 60 und ein in der Werkzeughalterung 60 befestigter Bohrer 62 drehend und schlagend antreibbar. Der Bohrhammer kann mit zwei, sich im wesentlichen senkrecht zur einer Betätigungsrichtung erstrekkenden Handgriffen 64, 66 geführt werden, wobei ein Handgriff 64 an einer dem Bohrer 62 abgewandten Seite an das Gehäuse 104 angeformt ist, und ein Handgriff 66 auf einer dem Bohrer 62 zugewandten Seite am Gehäuse 104 befestigt ist. Fig. 1 shows a drill hammer shown schematically with a housing 104 in which in a motor space 56, a drive motor 58 is mounted. By means of the drive motor 58, a tool holder 60 and a drill 62 fixed in the tool holder 60 can be driven in rotation and in a hammering manner by way of a gear unit 10, which is not shown in more detail. The hammer drill can be guided with two, 64 extending substantially perpendicular to an actuating direction handles 64, 66, wherein a handle 64 is formed on a side facing away from the drill bit 62 to the housing 104, and a handle 66 on a drill 62 facing side is attached to the housing 104.

Der Antriebsmotor 58 besitzt eine Antriebswelle 68, auf der im Motorraum 56 ein Lüfterrad 80 drehfest angeordnet ist (Fig. 2). Die Antriebswelle 68 ragt vom Motorraum 56 durch eine Zwischenwand 70 aus Aluminium in den Getrieberaum 10 und ist in der Zwischenwand 70 in einem Kugellager 48 drehbar gelagert. Das Kugellager 48 ist mit seinem Außenring 72 über einen Preßsitz mit der Zwischenwand 70 und ist mit seinem Innenring 74 über einen Preßsitz drehfest mit der Antriebswelle 68 verbunden. Das Kugellager 48 ist als Festlager ausgeführt, und zwar ist dieses axial in Richtung Getrieberaum 10 an einem Absatz 78 in der Zwischenwand 70 und axial in Richtung Motorraum 56 an einem in der Zwischenwand 70 befestigten Haltering 32 abgestützt. Der mit Schmiermittel gefüllte Getrieberaum 10 ist am Kugellager 48 über eine Dichtscheibe 76 in Richtung Motorraum 56 luft- und schmiermitteldicht abgedichtet.The drive motor 58 has a drive shaft 68, on which in the engine compartment 56, a fan 80 is arranged rotationally fixed ( Fig. 2 ). The drive shaft 68 protrudes from the engine compartment 56 through an intermediate wall 70 made of aluminum in the gear chamber 10 and is rotatably mounted in the intermediate wall 70 in a ball bearing 48. The ball bearing 48 is connected with its outer ring 72 via a press fit with the intermediate wall 70 and is rotatably connected with its inner ring 74 via a press fit with the drive shaft 68. The ball bearing 48 is designed as a fixed bearing, and this is supported axially in the direction of the gear housing 10 at a shoulder 78 in the intermediate wall 70 and axially toward the engine compartment 56 to a retaining wall 32 fixed in the intermediate wall 70. The lubricant-filled gear chamber 10 is sealed at the ball bearing 48 via a sealing washer 76 in the direction of the engine compartment 56 air and lubricant tight.

An einem in den Getrieberaum 10 ragenden Ende der Antriebswelle 68 ist ein Ritzel 82 angeformt, mit dem die Antriebswelle 68 mit einem auf einer Zwischenwelle 20 des Getriebes drehfest angeordneten, nicht näher dargestellten Zahnrad kämmt. Die Zwischenwelle 20 ist über ein Kugellager 16 in der Zwischenwand 70 drehbar gelagert. Das Kugellager 16 ist als Festlager ausgeführt, und zwar ist dieses axial in Richtung Motorraum 56 an einem Absatz 88 in der Zwischenwand 70 und axial in Wichtung Getrieberaum 10 über ein nicht näher dargestelltes, in der Zwischenwand 70 befestigtes Halteelement abgestützt.At a projecting into the gear housing 10 end of the drive shaft 68, a pinion 82 is formed, with which the drive shaft 68 with a rotatably mounted on an intermediate shaft 20 of the transmission, not shown gear meshes. The intermediate shaft 20 is rotatably supported by a ball bearing 16 in the intermediate wall 70. The ball bearing 16 is designed as a fixed bearing, and this is supported axially towards the engine compartment 56 at a shoulder 88 in the intermediate wall 70 and axially in weight gear chamber 10 via a non-illustrated, fixed in the intermediate wall 70 holding member.

Das Kugellager 16 bildet erfindungsgemäß einen Teil einer Schmiermitteldichtung 24 einer Druckausgleichseinrichtung 12, über die der Druck im Getrieberaum 10 ausgleichbar bzw. ein Druckaufbau im Getrieberaum 10 während des Betriebs des Bohrhammers durch Erwärmung sicher vermeidbar ist. Das Kugellager 16 ist mit seinem Innenring 84 über einen Preßsitz drehfest mit der Zwischenwelle 20 verbunden. Ferner ist das Kugellager 16 mit seinem Außenring 86 aus Stahl über einen Schiebesitz in einen von der Zwischenwand 70 gebildeten Lagersitz 28 eingebracht. Wird der Bohrhammer betrieben, erwärmt sich das Kugellager 16 und die Zwischenwand 70. Aufgrund ihrer unterschiedlichen Wärmeausdehnungskoeffizienten dehnt sich die Zwischenwand 70 aus Aluminium stärker aus als das Kugellager 16 aus Stahl. Zwischen dem Außenring 86 des Kugellagers 16 und der Zwischenwand 70 ergibt sich ein Spalt, der als Schmiermitteldichtung 24 bzw. als Spaltdichtung der Druckausgleichseinrichtung 12 dient, über die ein Druck ausgleichbar ist. Ein Lagerspalt zwischen dem Innenring 84 und dem Außenring 86 des Kugellagers 16 ist über einen Dichtring 90 luft- und schmiermitteldicht abgedichtet.The ball bearing 16 according to the invention forms part of a lubricant seal 24 of a pressure compensation device 12, via which the pressure in the gear chamber 10 compensated or a pressure build-up in the gear chamber 10 during operation of the hammer drill can be reliably avoided by heating. The ball bearing 16 is rotationally fixed with its inner ring 84 via a press fit connected to the intermediate shaft 20. Furthermore, the ball bearing 16 is introduced with its outer ring 86 made of steel via a sliding fit into a bearing seat 28 formed by the intermediate wall 70. If the hammer drill is operated, the ball bearing 16 and the intermediate wall 70 is heated. Due to their different thermal expansion coefficients, the intermediate wall 70 made of aluminum expands more than the ball bearing 16 made of steel. Between the outer ring 86 of the ball bearing 16 and the intermediate wall 70 there is a gap which serves as a lubricant seal 24 or as a gap seal of the pressure compensation device 12, via which a pressure can be compensated. A bearing gap between the inner ring 84 and the outer ring 86 of the ball bearing 16 is sealed by a sealing ring 90 air and lubricant tight.

Um eine ungewünschte Rotationsbewegung des Außenrings 86 des Kugellagers 16 in der Zwischenwand 70 zu vermeiden, ist dieser über das das Kugellager 16 in Richtung Getrieberaum 10 axial fixierende Halteelement in Umfangsrichtung durch eine formschlüssige Verbindung drehfest mit der Zwischenwand 70 verbunden.In order to avoid an undesired rotational movement of the outer ring 86 of the ball bearing 16 in the intermediate wall 70, this is rotatably connected via the ball bearing 16 in the direction of the gear housing 10 axially fixing retaining element in the circumferential direction by a positive connection with the intermediate wall 70.

Zu der sich zwischen dem Außenring 86 und der Zwischenwand 70 einstellenden Spaltdichtung ist ein von einem Filzring gebildetes Filterelement 46 in Reihe geschaltet. Das Filterelement 46 ist in einer das Kugellager 48 ringförmig umgebenden Ausnehmung 94 der Zwischenwand 70 eingebracht und ist durch den Haltering 32 in seiner Lage gehalten. In die Zwischenwand 70 ist koaxial zur Zwischenwelle 20 eine Bohrung 92 eingebracht, die in Richtung Motorraum 56 vom Filterelement 46 verdeckt ist und über die ein Druckunterschied zwischen dem Getrieberaum 10 und dem Motorraum 56 ausgeglichen werden kann.To the adjusting between the outer ring 86 and the intermediate wall 70 gap seal a filter element 46 formed by a felt ring is connected in series. The filter element 46 is inserted into a recess 94 surrounding the ball bearing 48 of the intermediate wall 70 and is held by the retaining ring 32 in its position. In the intermediate wall 70, a bore 92 is coaxially inserted to the intermediate shaft 20, which conceals in the direction of the engine compartment 56 from the filter element 46 is and over the pressure difference between the gear chamber 10 and the engine compartment 56 can be compensated.

In Fig. 3 ist eine Variante zu Fig. 2 mit einer Druckausgleichseinrichtung 14 dargestellt. Im wesentlichen gleichbleibende Bauteile sind in den dargestellten Ausführungsbeispielen grundsätzlich mit den gleichen Bezugszeichen beziffert. Ferner kann bezüglich gleichbleibender Merkmale und Funktionen auf die Beschreibung zum Ausführungsbeispiel in den Fig. 1 und 2 verwiesen werden. Die nachfolgende Beschreibung beschränkt sich im wesentlichen auf die Unterschiede zum Ausführungsbeispiel in den Fig. 1 und 2.In Fig. 3 is a variant too Fig. 2 shown with a pressure compensation device 14. Essentially identical components are numbered in the illustrated embodiments in principle with the same reference numerals. Furthermore, with regard to features and functions that are the same, the description of the exemplary embodiment in FIGS Fig. 1 and 2 to get expelled. The following description is essentially limited to the differences from the embodiment in the Fig. 1 and 2 ,

Eine Antriebswelle 22 eines Antriebsmotors 58 ist über ein Kugellager 18 in einer Zwischenwand 106 gelagert. Das Kugellager 18 bildet erfindungsgemäß einen Teil einer Schmiermitteldichtung 26 der Druckausgleichseinrichtung 14, über die der Druck in einem Getrieberaum 10 ausgleichbar ist. Das Kugellager 18 ist mit seinem Innenring 96 über einen Preßsitz drehfest mit der Antriebswelle 22 verbunden. Ferner ist das Kugellager 18 mit seinem Außenring 98 aus Stahl über einen Schiebesitz in einen von der Zwischenwand 106 gebildeten Lagersitz 30 eingebracht. Wird der Bohrhammer betrieben, erwärmt sich das Kugellager 18 und die Zwischenwand 106. Aufgrund ihrer unterschiedlichen Wärmeausdehnungskoeffizienten dehnt sich die Zwischenwand 106 aus Aluminium stärker aus als das Kugellager 18 aus Stahl. Zwischen dem Außenring 98 des Kugellagers 18 und der Zwischenwand 106 ergibt sich ein Spalt, der als Schmiermitteldichtung 26 bzw. Spaltdichtung der Druckausgleichseinrichtung 14 dient, über die ein Druck ausgleichbar ist. Ein Lagerspalt zwischen dem Innenring 96 und dem Außenring 98 des Kugellagers 18 ist über einen Dichtring 90 luft- und schmiermitteldicht abgedichtet.A drive shaft 22 of a drive motor 58 is mounted via a ball bearing 18 in an intermediate wall 106. The ball bearing 18 according to the invention forms part of a lubricant seal 26 of the pressure compensation device 14, via which the pressure in a gear chamber 10 can be compensated. The ball bearing 18 is rotatably connected with its inner ring 96 via a press fit with the drive shaft 22. Furthermore, the ball bearing 18 is introduced with its outer ring 98 made of steel via a sliding fit into a bearing seat 30 formed by the intermediate wall 106. When the hammer drill is operated, the ball bearing 18 and the intermediate wall 106 are heated. Due to their different coefficients of thermal expansion, the intermediate wall 106 of aluminum expands more than the steel ball bearing 18. Between the outer ring 98 of the ball bearing 18 and the intermediate wall 106 results in a gap which serves as a lubricant seal 26 and gap seal of the pressure compensation device 14, via which a pressure can be compensated. A bearing gap between the inner ring 96 and the outer ring 98 of the ball bearing 18 is sealed by a sealing ring 90 air and lubricant tight.

Um eine ungewünschte Rotationsbewegung des Außenrings 98 des Kugellagers 18 in der Zwischenwand 106 zu vermeiden, ist dieser über einen das Kugellager 18 in Richtung Getrieberaum 10 axial fixierenden Haltering 32 in Umfangsrichtung durch eine formschlüssige Verbindung drehfest mit der Zwischenwand 106 verbunden.In order to avoid an undesired rotational movement of the outer ring 98 of the ball bearing 18 in the intermediate wall 106, this is rotatably connected via a ball bearing 18 in the direction of gear chamber 10 axially fixing retaining ring 32 in the circumferential direction by a positive connection with the intermediate wall 106.

Zu der sich zwischen dem Außenring 98 und der Zwischenwand 106 einstellenden Spaltdichtung ist ein von einem Filzring gebildetes Filterelement 46 in Reihe geschaltet. Das Filterelement 46 ist in einer das Kugellager 18 ringförmig umgebenden Ausnehmung 94 der Zwischenwand 106 eingebracht und ist durch den Haltering 32 in seiner Lage gehalten. Vom Außenring 98 des Kugellagers 18 erstrecken sich vier gleichmäßig über den Umfang verteilte, in die Zwischenwand 106 eingebrachte radiale Druckausgleichskanäle 50, 52, die radial nach außen am Filterelement 46 münden.To the adjusting between the outer ring 98 and the intermediate wall 106 gap seal formed by a felt ring filter element 46 is connected in series. The filter element 46 is inserted into a recess 94 surrounding the ball bearing 18 in the intermediate wall 106 and is held in its position by the retaining ring 32. From the outer ring 98 of the ball bearing 18 extend four uniformly distributed over the circumference, introduced into the intermediate wall 106 radial pressure equalization channels 50, 52 which open radially outward on the filter element 46.

Eine Zwischenwelle 20 eines im Getrieberaum 10 nicht näher dargestellten Getriebes ist über ein Kugellager 100 in der Zwischenwand 106 gelagert. Die Zwischenwand 106 ist im Bereich des Kugellagers 100 vom Getrieberaum 10 in Richtung Motorraum 56 dicht verschlossen.An intermediate shaft 20 of a transmission in the transmission 10 not shown in detail is mounted on a ball bearing 100 in the intermediate wall 106. The intermediate wall 106 is sealed in the region of the ball bearing 100 from the gear chamber 10 in the direction of the engine compartment 56.

Bei einem Ausführungsbeispiel in Fig. 4 ist eine Zwischenwelle 54 über ein Kugellager 36 in einer Zwischenwand 70 drehbar gelagert. Das Kugellager 36 bildet erfindungsgemäß einen Teil einer Schmiermitteldichtung 38 einer Druckausgleichseinrichtung 34, über die der Druck in einem Getrieberaum 10 ausgleichbar ist. Das Kugellager 36 ist mit seinem Innenring 84 über einen Preßsitz auf einem Lagersitz 40 der Zwischenwelle 54 drehfest angeordnet. Ferner ist das Kugellager 36 mit seinem Außenring 86 aus Stahl über einen Preßsitz in einen von der Zwischenwand 70 gebildeten Lagersitz 102 eingebracht.In one embodiment in Fig. 4 an intermediate shaft 54 is rotatably supported via a ball bearing 36 in an intermediate wall 70. The ball bearing 36 according to the invention forms part of a lubricant seal 38 of a pressure compensation device 34, over which the pressure in a gear chamber 10 can be compensated. The ball bearing 36 is arranged with its inner ring 84 via a press fit on a bearing seat 40 of the intermediate shaft 54 rotatably. Further, the ball bearing 36 is introduced with its outer ring 86 made of steel via a press fit in a bearing seat 102 formed by the intermediate wall 70.

In eine Lagerfläche des Lagersitzes 40 ist ein von einer gewindeförmigen Vertiefung gebildeter Druckausgleichskanal 42 eingebracht, der entgegen einer Entlüftungsrichtung des Getrieberaums 10 in einer Ringnut 44 mündet. Der Druckausgleichskanal 42 bildet eine Labyrinthdichtung und besitzt während des Betriebs zudem eine Rückförderwirkung des Schmiermittels. Ein Lagerspalt zwischen dem Innenring 84 und dem Außenring 86 des Kugellagers 36 ist über einen Dichtring 90 luft- und schmiermitteldicht abgedichtet.In a bearing surface of the bearing seat 40, a pressure equalization channel 42 formed by a thread-shaped depression is introduced, which opens into an annular groove 44 counter to a venting direction of the gear chamber 10. The pressure compensation channel 42 forms a labyrinth seal and also has a return effect of the lubricant during operation. A bearing gap between the inner ring 84 and the outer ring 86 of the ball bearing 36 is sealed by a sealing ring 90 air and lubricant tight.

Bezugszeichenreference numeral

1010
Raumroom
1212
Druckausgleichseinrich- tungPressure compensation device
1414
Druckausgleichseinrich- tungPressure compensation device
1616
Lagercamp
1818
Lagercamp
2020
Bauteilcomponent
2222
Bauteilcomponent
2424
Schmiermitteldichtunglubricant seal
2626
Schmiermitteldichtunglubricant seal
2828
Lagersitzbearing seat
3030
Lagersitzbearing seat
3232
Bauteilcomponent
3434
Druckausgleichseinrich- tungPressure compensation device
3636
Lagercamp
3838
Schmiermitteldichtunglubricant seal
4040
Lagersitzbearing seat
4242
DruckausgleichskanalPressure compensation channel
4444
Ringnutring groove
4646
Filterelementfilter element
4848
Lagercamp
5050
DruckausgleichskanalPressure compensation channel
5252
DruckausgleichskanalPressure compensation channel
5454
Bauteilcomponent
5656
Motorraumengine compartment
5858
Antriebsmotordrive motor
6060
Werkzeughalterungtool holder
6262
Bohrerdrill
6464
Handgriffhandle
6666
Handgriffhandle
6868
Antriebswelledrive shaft
7070
Zwischenwandpartition
7272
Außenringouter ring
7474
Innenringinner ring
7676
Dichtscheibesealing washer
7878
Absatzparagraph
8080
Lüfterradfan
8282
Ritzelpinion
8484
Innenringinner ring
8686
Außenringouter ring
8888
Absatzparagraph
9090
Dichtringseal
9292
Bohrungdrilling
9494
Ausnehmungrecess
9696
Innenringinner ring
9898
Außenringouter ring
100100
Kugellagerball-bearing
102102
Lagersitzbearing seat
104104
Gehäusecasing
106106
Zwischenwandpartition

Claims (11)

  1. Power tool, in particular hand-held hammer drill, having a chamber (10) containing lubricant and a pressure-equalizing device (12, 14, 34) for said chamber (10) in the region of a bearing (16, 18, 36) of a rotationally drivable component, the bearing (16, 18, 36) forming at least part of a lubricant seal (24, 26, 38) of the pressure-equalizing device (12, 14, 34), via which a pressure in the chamber (10) can be equalized, characterized in that the rotationally drivable component forms a drive or intermediate shaft (20, 22, 54).
  2. Power tool according to Claim 1, characterized in that the lubricant seal (24, 26) is designed as a gap seal and is arranged between the bearing (16, 18) and a bearing seat (28, 30).
  3. Power tool according to Claim 2, characterized in that the bearing (16, 18) and the bearing seat (28, 30) are formed from different materials having different coefficients of thermal expansion and the latter are used for producing the lubricant seal (24, 26).
  4. Power tool according to Claim 3, characterized in that the bearing (16, 18) is designed as a fixed bearing and a component (32) fixing the bearing (16, 18) in the axial direction is used for fixing the bearing (16, 18) in the circumferential direction.
  5. Power tool according to one of the preceding claims, characterized in that a pressure-equalizing passage (42) is incorporated in a bearing surface of the bearing and/or in a bearing surface of the bearing seat (40).
  6. Power tool according to Claim 5, characterized in that the pressure-equalizing passage (42) is formed at least partly by a screw-thread-shaped recess.
  7. Power tool according to Claim 6, characterized in that the pressure-equalizing passage (42) opens out in at least one annular groove (44).
  8. Power tool according to one of the preceding claims, characterized in that a filter element (46) is connected in series with the lubricant seal (24, 26, 38) at least partly formed by the bearing (16, 18, 36).
  9. Power tool according to Claim 8, characterized in that the filter element (46) is fixed in its position by a component (32) fixing a bearing (18, 48).
  10. Power tool according to one of the preceding claims, characterized in that at least two radial pressure-equalizing passages (50, 52) branch off from the bearing (18).
  11. Power tool according to Claim 8 or 9 and 10, characterized in that the bearing (18) is surrounded by an annular filter element (46), and the pressure-equalizing passages (50, 52) open out from the bearing (18) radially outwards on the filter element (46).
EP01969266A 2000-09-15 2001-08-31 Machine tool with a chamber for lubricating agent and a pressure equalisation device for said chamber Expired - Lifetime EP1320446B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10045618A DE10045618A1 (en) 2000-09-15 2000-09-15 Machine tool with a room with lubricant and a pressure compensation device of the room
DE10045618 2000-09-15
PCT/DE2001/003358 WO2002022315A1 (en) 2000-09-15 2001-08-31 Machine tool with a chamber for lubricating agent and a pressure equalisation device for said chamber

Publications (2)

Publication Number Publication Date
EP1320446A1 EP1320446A1 (en) 2003-06-25
EP1320446B1 true EP1320446B1 (en) 2009-02-11

Family

ID=7656283

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01969266A Expired - Lifetime EP1320446B1 (en) 2000-09-15 2001-08-31 Machine tool with a chamber for lubricating agent and a pressure equalisation device for said chamber

Country Status (5)

Country Link
US (1) US6722449B2 (en)
EP (1) EP1320446B1 (en)
JP (1) JP2004508948A (en)
DE (2) DE10045618A1 (en)
WO (1) WO2002022315A1 (en)

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Publication number Publication date
JP2004508948A (en) 2004-03-25
DE10045618A1 (en) 2002-04-04
EP1320446A1 (en) 2003-06-25
US20030121683A1 (en) 2003-07-03
DE50114703D1 (en) 2009-03-26
US6722449B2 (en) 2004-04-20
WO2002022315A1 (en) 2002-03-21

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