EP2161108B1 - Machine tool and method for producing same - Google Patents

Machine tool and method for producing same Download PDF

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Publication number
EP2161108B1
EP2161108B1 EP09164985A EP09164985A EP2161108B1 EP 2161108 B1 EP2161108 B1 EP 2161108B1 EP 09164985 A EP09164985 A EP 09164985A EP 09164985 A EP09164985 A EP 09164985A EP 2161108 B1 EP2161108 B1 EP 2161108B1
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EP
European Patent Office
Prior art keywords
piston
accommodating
piston unit
region
segment
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP09164985A
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German (de)
French (fr)
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EP2161108A1 (en
Inventor
Richard Engel
Michael Weiss
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP2161108A1 publication Critical patent/EP2161108A1/en
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Classifications

    • 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
    • B25D17/06—Hammer pistons; Anvils ; Guide-sleeves for pistons
    • 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
    • B25D17/24—Damping the reaction force
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2211/00—Details of portable percussive tools with electromotor or other motor drive
    • B25D2211/06—Means for driving the impulse member
    • B25D2211/061—Swash-plate actuated impulse-driving mechanisms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2222/00—Materials of the tool or the workpiece
    • B25D2222/21—Metals
    • B25D2222/24—Aluminium
    • 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
    • B25D2250/065—Details regarding assembling of the tool
    • 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
    • B25D2250/391—Use of weights; Weight properties of the tool

Definitions

  • the invention relates to a machine tool and a manufacturing method for a machine tool according to the preamble of the independent claims.
  • a drive device which comprises at least one axial drive device for driving a tool.
  • the axial drive device on, a coupling member comprehensive motion transmission unit.
  • a receiving area and a piston portion having a longitudinal axis piston unit is provided.
  • the known piston units, in particular the piston areas of the known piston units, have a substantially cylindrical shape which extends cylindrically symmetrically around the longitudinal axis.
  • the coupling member of the movement transmission unit is connected in the receiving region of the piston unit with the piston unit via a coupling pin.
  • the receiving area of the piston unit is usually produced by post-processing steps.
  • a receiving bore is introduced into the piston cylinder perpendicular to the longitudinal axis.
  • a joint recess is cut into the piston cylinder on one end face.
  • the joint recess is designed as a hinge groove, so that the piston unit has two, substantially symmetrical receiving areas.
  • the piston unit is usually excited in machine tools by means of the axial drive device to a substantially axial oscillatory movement. Due to the inertial mass of the piston unit, so-called inertial or inertial forces, which can react on the machine tool in the form of vibrations, occur in the reversal points of this oscillation movement.
  • the strength of the mass forces depends not only on the amount of speed change in the turning points but also on the inert mass itself, which reverses your direction of motion.
  • WO99 / 67063A1 discloses an example of a machine tool according to the preamble of claim 1.
  • the receiving portion of the piston unit has to, a substantially dome-shaped receiving segment and a connecting segment.
  • the receiving segment is connected to the piston area via the connecting segment.
  • the term "dome-shaped" is understood to mean, in particular, spherical, part-spherical-shaped, cylindrical-shell-like or circular-ring-like.
  • the dome-shaped design of the receiving segment in particular means that the receiving area can be performed with a minimum cost of materials.
  • the inertial mass of the piston unit according to the invention is advantageously reduced.
  • WO99 / 67063A1 also discloses an example of a method of manufacturing such a machine tool.
  • the connecting segment has a constriction, which is characterized by a transverse extension directed perpendicular to the longitudinal axis of the piston region, which is smaller than a transverse extension of the receiving segment directed perpendicular to the longitudinal axis of the piston region.
  • the constriction has a substantially concave surface profile, viewed from a lateral surface of the piston area.
  • the machine tool according to the invention with the features of the main claim has the advantage that with the same performance of the axial drive device for driving the tool even lower mass forces occur in the reversal points of the oscillatory motion.
  • a particularly advantageous embodiment of the piston unit according to the invention is achieved in that the receiving segment has a substantially spherical outer circumferential surface.
  • the receiving segment is designed essentially as a circular ring with a substantially cylindrical outer circumferential surface, another advantageous embodiment of the piston unit according to the invention is achieved.
  • the receiving segment has a receiving bore for receiving a coupling bolt.
  • the receiving bore in this case has a bore axis which is perpendicular to the longitudinal axis of the piston area and this preferably cuts.
  • the bore axis and the longitudinal axis define a first main plane of the piston unit.
  • a particularly good mobility between the coupling member of the movement transmission unit and the piston unit according to the invention is achieved in that the receiving region has a joint recess, which extends in a recess plane perpendicular to the longitudinal axis of the piston region.
  • the recess plane is substantially perpendicular to the first main plane.
  • two receiving segments in particular arranged symmetrically about the longitudinal axis of the piston region and preferably mirror-symmetrical, are provided. These receiving segments are each connected via a connecting segment with the piston area. Preferably, each of the two receiving segments each have a receiving bore. In particular, the bore axes are aligned coaxially.
  • the receiving region has a transverse extent which is perpendicular to the longitudinal axis of the piston region and which is smaller than a diameter of the piston region.
  • the transverse extent of the receiving area at no point is equal to or greater than the diameter of the piston area.
  • a particularly lightweight embodiment of the piston unit of the machine tool according to the invention is achieved in that the piston unit consists of a metallic material, in particular an aluminum or magnesium-based light metal or a corresponding light metal alloy.
  • the axial drive device is a hammer mechanism, in particular an air cushion impact mechanism.
  • the piston unit is designed as a percussion piston.
  • the machine tool according to the invention can also be designed, for example, as a saw, in which the piston unit according to the invention is designed as an axially oscillating tool spindle of a saw drive.
  • the piston unit according to the invention can be used advantageously.
  • Another aspect of the invention relates to a manufacturing method according to claim 11 for a machine tool according to the invention with a piston unit, wherein in a partial step, the piston unit with the piston area and the receiving area is produced with a chipless manufacturing process.
  • the piston unit according to the invention is produced by means of a casting, injection, injection molding, powder injection molding or sintering process.
  • the chipless production process can be a so-called MIM process.
  • the partial step is the only process step for producing the piston unit.
  • FIG. 1 shows a schematic view of a hammer drill 10 as an example of a machine tool 10a, in particular a hand tool 10b.
  • the hammer drill 10 has a machine housing 12.
  • a tool holder 16 is provided at a front end face 14 of the machine housing 12.
  • the tool holder 16 serves to receive, in particular the exchangeable receiving a tool 18th
  • a drive device 20 is arranged, which comprises an axial drive device 22.
  • the drive device 20 is operatively connected to a drive of the tool 18 with this.
  • the drive device 20 further has a drive motor 24, in particular an electric motor 26, which in FIG. 1 only indicated is shown.
  • the axial drive device 22 converts a rotational movement 100 of the drive motor 24, 26 into an axial movement, in particular into an essentially axial oscillation movement 102. This axial oscillating movement 102 is transmitted to a piston unit 32 via a coupling member 28 of a motion transmission unit 30.
  • the piston unit 32 is designed as a percussion piston 34 of a striking mechanism 36, in particular an air cushion impact mechanism 38.
  • the piston unit 32 is received in the hammer drill 10 along a tool axis 40 in a hammer tube 42 axially movable.
  • Such percussion mechanisms 36, 38 are well known, so that their representation with respect to structure and operation is omitted at this point.
  • An end portion 44 of the piston unit 32 protruding from the hammer tube 42 is designed as a receiving area 46.
  • the receiving region 46 has a receiving bore 48.
  • a coupling pin 50 is received in the receiving bore 48.
  • the coupling pin 50 is rotatably mounted in particular in the receiving bore.
  • the coupling member 28 of the movement transmission unit 30 is received in the coupling pin 50 in a receiving bore, not shown here. This way you can a movement of the coupling member 28, in particular caused by the axial oscillatory movement 102 pivotal movement of the coupling member 28, which extends substantially axially along the tool axis 40, are transmitted to the piston unit 32.
  • FIG. 2 shows a piston unit 32 as known from the prior art.
  • the piston unit 32 is designed substantially cylindrical.
  • the cylindrical shape extends along a longitudinal axis 52.
  • the piston unit 32 has two receiving areas 46, 47.
  • the receiving areas 46, 47 each have a receiving bore 48, 49, the receiving bores 48, 49 being aligned along a bore axis 51, in particular coaxially to the bore axis 51.
  • the bore axis 51 and the longitudinal axis 52 thereby span a first main plane 104.
  • the piston unit 32 comprises, in addition to the receiving regions 46, 47, a piston region 54.
  • the piston region 54 is formed completely cylindrical and has a cylinder diameter Dz.
  • the receiving regions 46, 47 each have an outer lateral surface 58, which emerges substantially smoothly and without a deviation from the cylinder diameter Dz from the piston region 54.
  • the joint recess 56 extends substantially parallel to a, on the first main plane 104 perpendicular and defined by the intersection of the bore axis 51 and the longitudinal axis 52 recess 106.
  • the joint recess extends at least along the bore axis 51 symmetrically about the recess plane 106.
  • the joint recess 56 is formed as a hinge groove. In this joint recess 56, the coupling member 28 engages, as in FIG. 1 is shown.
  • the piston unit 32 is made from a cylindrical blank.
  • the receiving bore 48 is thereby introduced as a bore, while the joint recess 56 is produced for example by milling.
  • the resulting receiving area 46 proves to be not optimal with respect to a moving mass of the piston unit 32.
  • FIG. 3a shows a first embodiment of a piston unit 32a according to the invention in a perspective side view. All the same or equivalent features obtained in the description of the first embodiment hereinafter followed by a "a".
  • the piston region 54a of the piston unit 32a is also designed substantially cylindrical here.
  • the piston region 54a extends along the longitudinal axis 52a.
  • the receiving regions 46a, 47a of the piston unit 32a have a substantially, in particular piecemeal, in particular spherical outer lateral surface 58a.
  • the term "piecewise” is understood in particular to mean that the outer lateral surface 58a is of a dome-shaped, in particular spherical, shape substantially up to the receiving bores 48a, 49a and the joint recess 56a.
  • each receiving area 46a, 47a is divided into a respective receiving segment 60a, 61a and in a connecting segment 62a, 63a.
  • the receiving segment 60a is essentially characterized by the piece-wise dome-shaped, in particular spherical, outer lateral surface 58a. In the embodiment to Fig.
  • each receiving segment 60a, 61a a rear, flat end face 65a, 67a is provided.
  • This end face 65a, 67a favors a compact installation of the piston unit 32a according to the invention into the drive device 20a.
  • the outer lateral surface 58a has a maximum transverse dimension 64a which is smaller than an outer diameter 66a of the piston region 54a, in particular smaller than the cylinder diameter Dz.
  • the transverse extent 64a is understood to mean a transverse extent or diameter perpendicular to the longitudinal axis 52a.
  • the region lying as the connecting segment 62a between the receiving segment 60a and the piston region 54a is substantially characterized by a constriction 68a.
  • a transverse extent 70a of the constriction 68a is smaller than the transverse extent 64a of the receiving segment 62a.
  • FIGS. 3d and 3e show two different sections through the end portion 44a of the piston unit 32a according to the first embodiment. This is in particular from 3d figure again the piecewise dome-shaped, in particular the piecewise spherical shape of the outer circumferential surface 58a of the receiving segments 60a clearly.
  • FIG. 4a a second embodiment of a piston unit 32b is shown. All the same or equivalent features to those described above are given a "b" in the description below.
  • the piston unit 32b differs from the first embodiment of the piston unit 32a, in particular in their receiving areas 46b, 47b. Since the construction of both receiving areas 46b, 47b in the first exemplary embodiment is mirror-symmetrical to the hinge recess 56b, only one receiving area 46b will be described below, the description being analogous to the second receiving area 47b.
  • the receiving segment 60b has a substantially cylindrical outer circumferential surface 58b.
  • a rear, flat end face 65b, 67b is provided on each receiving segment 60b, 61b.
  • This end face 65b, 67b favors a compact installation of the piston unit 32b according to the invention in the drive device 20b.
  • receiving bore 48b is provided on each receiving segment 60b.
  • the outer circumferential surface 58b extends substantially cylindrically around the receiving bore 48b, in particular, it is formed almost coaxially around the bore axis 51b.
  • the receiving segment 60b thereby appears to be essentially loop-shaped.
  • the piston unit 32a, 32b of the first embodiment of a piston unit according to the invention can be produced, among other things, particularly simply by using a turning operation of a cylindrical starting body. Moreover, it is possible to manufacture the piston unit 32a, 32b with the piston portion 54a, 54b and the receiving portions 46a, 47a, 46b, 47b by a casting, injection, injection molding, powder injection molding or sintering process. In particular, a so-called MIM process could be advantageously used here. It is preferably possible in these processes to produce a piston unit 32a, 32b without further process steps.
  • the invention is not limited to piston units 32a, 32b each having two, in particular two symmetrically shaped receiving areas 46a, 47a, 46b, 47b.
  • this can only one Receiving area 46a, 46b have.
  • the coupling pin 50 is connected to the receiving area 46a, 46b or the coupling member 28, in particular firmly connected or made in one piece.
  • the receiving area 46a, 46b itself to include almost the first main plane of the bore axis 51 and the longitudinal axis 52a, 52b in such a way that the receiving area 52a, 52b extends almost symmetrically about the longitudinal axis.
  • the coupling member 28 may encompass the receiving region 46a, 46b.

Abstract

The machine tool has a drive device (20), which comprises an axial drive unit (22) for driving a tool (18), where the axial drive unit has a movement transmission unit (30) with a coupling element (28) and a piston unit (32) made of aluminum or light metal alloy. The coupling element of the movement transmission unit is connected with the piston unit in a receiving area (46) by a coupling pin (50). The receiving area has a receiving segment formed in dome shape and a connecting segment, where the receiving segment is connected with a piston area by the connecting segment. An independent claim is included for a method for manufacturing a machine tool.

Description

Stand der TechnikState of the art

Die Erfindung betrifft eine Werkzeugmaschine und ein Herstellverfahren für eine Werkzeugmaschine nach der Gattung der unabhängigen Ansprüche.The invention relates to a machine tool and a manufacturing method for a machine tool according to the preamble of the independent claims.

Es sind bereits Werkzeugmaschinen mit einer Antriebsvorrichtung, welche mindestens eine Axialantriebsvorrichtung zum Antrieb eines Werkzeugs umfasst, bekannt. Dabei weist die Axialantriebsvorrichtung eine, ein Koppelglied umfassende Bewegungsübertragungseinheit auf. Ferner ist eine, einen Aufnahmebereich und einen Kolbenbereich mit einer Längsachse aufweisende Kolbeneinheit vorgesehen. Die bekannten Kolbeneinheiten, insbesondere die Kolbenbereiche der bekannten Kolbeneinheiten weisen dabei eine im Wesentlichen zylindrische Gestalt auf, welche sich zylindersymmetrisch um die Längsachse erstreckt. Das Koppelglied der Bewegungsübertragungseinheit ist im Aufnahmebereich der Kolbeneinheit mit der Kolbeneinheit über einen Koppelbolzen verbunden.There are already known machine tools with a drive device which comprises at least one axial drive device for driving a tool. In this case, the axial drive device on, a coupling member comprehensive motion transmission unit. Furthermore, one, a receiving area and a piston portion having a longitudinal axis piston unit is provided. The known piston units, in particular the piston areas of the known piston units, have a substantially cylindrical shape which extends cylindrically symmetrically around the longitudinal axis. The coupling member of the movement transmission unit is connected in the receiving region of the piston unit with the piston unit via a coupling pin.

Der Aufnahmebereich der Kolbeneinheit wird in der Regel durch Nachbearbeitungsschritte hergestellt. Dabei wird senkrecht zur Längsachse eine Aufnahmebohrung in den Kolbenzylinder eingebracht. Ferner wird auf einer Stirnseite eine Gelenkaussparung in den Kolbenzylinder eingeschnitten. In den meisten Fällen ist die Gelenkaussparung als Gelenknut ausgeführt, so dass die Kolbeneinheit zwei, im Wesentlichen symmetrisch ausgeführte Aufnahmebereiche aufweist.The receiving area of the piston unit is usually produced by post-processing steps. In this case, a receiving bore is introduced into the piston cylinder perpendicular to the longitudinal axis. Furthermore, a joint recess is cut into the piston cylinder on one end face. In most cases, the joint recess is designed as a hinge groove, so that the piston unit has two, substantially symmetrical receiving areas.

Die Kolbeneinheit wird in der Regel in Werkzeugmaschinen mittels der Axialantriebsvorrichtung zu einer im Wesentlichen axialen Oszillationsbewegung angeregt. In den Umkehrpunkten dieser Oszillationsbewegung treten aufgrund der trägen Masse der Kolbeneinheit sogenannte Trägheits- oder Massenkräfte auf, welche auf die Werkzeugmaschine in Form von Vibrationen zurückwirken können. Die Stärke der Massenkräfte hängt neben der Höhe der Geschwindigkeitsänderung in den Umkehrpunkten im Wesentlichen von der trägen Masse selbst ab, welche Ihre Bewegungsrichtung umkehrt.The piston unit is usually excited in machine tools by means of the axial drive device to a substantially axial oscillatory movement. Due to the inertial mass of the piston unit, so-called inertial or inertial forces, which can react on the machine tool in the form of vibrations, occur in the reversal points of this oscillation movement. The strength of the mass forces depends not only on the amount of speed change in the turning points but also on the inert mass itself, which reverses your direction of motion.

WO99/67063A1 offenbart ein Beispiel einer Werkzeugmaschine gemäß dem Oberbegriff des Anspruchs 1. Der Aufnahmebereich der Kolbeneinheit weist dazu ein, im Wesentlichen kalottenförmig ausgebildetes Aufnahmesegment und ein Verbindungssegment auf. Das Aufnahmesegment ist dabei mit dem Kolbenbereich über das Verbindungssegment verbunden. Unter "kalottenförmig ausgebildet" wird dabei insbesondere kugelförmig, kugelteilschnittförmig, zylinderschalenartig oder kreisringähnlich ausgebildet verstanden. Die kalottenförmige Ausbildung des Aufnahmesegments führt insbesondere dazu, dass der Aufnahmebereich mit einem minimalen Materialaufwand ausgeführt werden kann. Dadurch wird die träge Masse der erfindungsgemäßen Kolbeneinheit günstig reduziert. WO99/67063A1 offenbart auch ein Beispiel eines Verfahrens zum Herstellen eine solche Werkzeugmaschine. WO99 / 67063A1 discloses an example of a machine tool according to the preamble of claim 1. The receiving portion of the piston unit has to, a substantially dome-shaped receiving segment and a connecting segment. The receiving segment is connected to the piston area via the connecting segment. The term "dome-shaped" is understood to mean, in particular, spherical, part-spherical-shaped, cylindrical-shell-like or circular-ring-like. The dome-shaped design of the receiving segment in particular means that the receiving area can be performed with a minimum cost of materials. As a result, the inertial mass of the piston unit according to the invention is advantageously reduced. WO99 / 67063A1 also discloses an example of a method of manufacturing such a machine tool.

Offenbarung der ErfindungDisclosure of the invention

Erfindungsgemäß weist das Verbindungssegment eine Einschnürung auf, welche durch eine senkrecht zur Längsachse des Kolbenbereichs gerichtete Querausdehnung ausgezeichnet ist, welche kleiner ist als eine senkrecht zur Längsachse des Kolbenbereichs gerichtete Querausdehnung des Aufnahmesegments. Insbesondere weist die Einschnürung einen, von einer Mantelfläche des Kolbenbereichs ausgesehen, im wesentlichen konkaven Oberflächenverlauf auf.According to the invention, the connecting segment has a constriction, which is characterized by a transverse extension directed perpendicular to the longitudinal axis of the piston region, which is smaller than a transverse extension of the receiving segment directed perpendicular to the longitudinal axis of the piston region. In particular, the constriction has a substantially concave surface profile, viewed from a lateral surface of the piston area.

Die erfindungsgemäße Werkzeugmaschine mit den Merkmalen des Hauptanspruchs hat den Vorteil, dass bei gleicher Leistungsfähigkeit der Axialantriebsvorrichtung zum Antrieb des Werkzeugs noch geringere Massenkräfte in den Umkehrpunkten der Oszillationsbewegung auftreten.The machine tool according to the invention with the features of the main claim has the advantage that with the same performance of the axial drive device for driving the tool even lower mass forces occur in the reversal points of the oscillatory motion.

Durch die in den Unteransprüchen aufgeführten Maßnahmen ergeben sich vorteilhafte Weiterbildungen und Verbesserungen der im Hauptanspruch angegebenen Merkmale.The measures listed in the dependent claims, advantageous refinements and improvements of the main claim features.

Eine besonders vorteilhafte Ausführung der erfindungsgemäßen Kolbeneinheit wird dadurch erreicht, dass das Aufnahmesegment eine im Wesentlichen kugelförmige Außenmantelfläche aufweist.A particularly advantageous embodiment of the piston unit according to the invention is achieved in that the receiving segment has a substantially spherical outer circumferential surface.

Ist das Aufnahmesegment im Wesentlichen als ein Kreisring mit einer im Wesentlichen zylindrischen Außenmantelfläche ausgebildet, wird eine andere vorteilhafte Ausführung der erfindungsgemäßen Kolbeneinheit erreicht.If the receiving segment is designed essentially as a circular ring with a substantially cylindrical outer circumferential surface, another advantageous embodiment of the piston unit according to the invention is achieved.

Eine effiziente und einfache Wirkverbindung der erfindungsgemäßen Kolbeneinheit mit dem Koppelglied der Bewegungsübertragungseinheit der Axialantriebsvorrichtung wird dadurch erreicht, dass das Aufnahmesegment eine Aufnahmebohrung für die Aufnahme eines Koppelbolzens aufweist. Insbesondere wenn die Aufnahmebohrung eine zur Längsachse des Kolbenbereichs senkrecht stehende Aufnahmebohrung ist, wird auch eine montagefreundliche Ausführung erreicht. Die Aufnahmebohrung weist dabei eine Bohrungsachse auf, welche auf der Längachse des Kolbenbereichs senkrecht steht und diese vorzugsweise schneidet. Die Bohrungsachse und die Längsachse legen dabei eine erste Hauptebene der Kolbeneinheit fest.An efficient and simple operative connection of the piston unit according to the invention with the coupling member of the movement transmission unit of the axial drive device is achieved in that the receiving segment has a receiving bore for receiving a coupling bolt. In particular, when the receiving bore is a vertical to the longitudinal axis of the piston portion receiving bore, a mounting-friendly design is achieved. The receiving bore in this case has a bore axis which is perpendicular to the longitudinal axis of the piston area and this preferably cuts. The bore axis and the longitudinal axis define a first main plane of the piston unit.

Eine besonders gute Beweglichkeit zwischen dem Koppelglied der Bewegungsübertragungseinheit und der erfindungsgemäßen Kolbeneinheit wird dadurch erreicht, dass der Aufnahmebereich eine Gelenkaussparung aufweist, welche in einer zu der Längsachse des Kolbenbereichs senkrechten Aussparungsebene verläuft. Vorzugsweise steht die Aussparungsebene im Wesentlichen senkrecht auf der ersten Hauptebene.A particularly good mobility between the coupling member of the movement transmission unit and the piston unit according to the invention is achieved in that the receiving region has a joint recess, which extends in a recess plane perpendicular to the longitudinal axis of the piston region. Preferably, the recess plane is substantially perpendicular to the first main plane.

Bei einer bevorzugten Ausführung der erfindungsgemäßen Werkzeugmaschine sind zwei, insbesondere symmetrisch um die Längsachse des Kolbenbereichs angeordnete, vorzugsweise spiegelsymmetrisch ausgebildete Aufnahmesegmente vorgesehen. Diese Aufnahmesegmente sind dabei jeweils über ein Verbindungssegment mit dem Kolbenbereich verbunden. Vorzugsweise weist jedes der beiden Aufnahmesegmente je eine Aufnahmebohrung auf. Insbesondere sind dabei die Bohrungsachsen koaxial ausgerichtet.In a preferred embodiment of the machine tool according to the invention, two receiving segments, in particular arranged symmetrically about the longitudinal axis of the piston region and preferably mirror-symmetrical, are provided. These receiving segments are each connected via a connecting segment with the piston area. Preferably, each of the two receiving segments each have a receiving bore. In particular, the bore axes are aligned coaxially.

In einer besonders bevorzugten und vorteilhaften Ausführung weist der Aufnahmebereich eine zur Längsachse des Kolbenbereichs senkrechte Querausdehnung auf, welche kleiner ist als ein Durchmesser des Kolbenbereichs. Insbesondere ist die Querausdehnung des Aufnahmebereichs an keiner Stelle gleich oder größer als der Durchmesser des Kolbenbereichs.In a particularly preferred and advantageous embodiment, the receiving region has a transverse extent which is perpendicular to the longitudinal axis of the piston region and which is smaller than a diameter of the piston region. In particular, the transverse extent of the receiving area at no point is equal to or greater than the diameter of the piston area.

In einer kostengünstigen Ausführung sind der Kolbenbereich und der Aufnahmebereich der Kolbeneinheit einstückig ausgeführt.In a cost-effective design of the piston area and the receiving area of the piston unit are made in one piece.

Eine besonders leichte Ausführung der Kolbeneinheit der erfindungsgemäßen Werkzeugmaschine wird dadurch erreicht, dass die Kolbeneinheit aus einem metallischen Material, insbesondere einem aluminium- oder magnesiumbasierten Leichtmetall oder einer entsprechenden Leichtmetalllegierung besteht.A particularly lightweight embodiment of the piston unit of the machine tool according to the invention is achieved in that the piston unit consists of a metallic material, in particular an aluminum or magnesium-based light metal or a corresponding light metal alloy.

In einer bevorzugten Ausführung einer erfindungsgemäßen Werkzeugmaschine ist die axiale Antriebsvorrichtung ein Schlagwerk, insbesondere ein Luftpolsterschlagwerk. Die Kolbeneinheit ist dabei als ein Schlagwerkskolben ausgeführt.In a preferred embodiment of a machine tool according to the invention, the axial drive device is a hammer mechanism, in particular an air cushion impact mechanism. The piston unit is designed as a percussion piston.

Die erfindungsgemäße Werkzeugmaschine kann aber auch beispielsweise als eine Säge ausgeführt sein, in welcher die erfindungsgemäße Kolbeneinheit als axial oszillierende Werkzeugspindel eines Sägeantriebs ausgeführt ist. Darüber hinaus sind andere Ausführungen von Werkzeugmaschinen möglich, bei denen die erfindungsgemäße Kolbeneinheit vorteilhaft eingesetzt werden kann.However, the machine tool according to the invention can also be designed, for example, as a saw, in which the piston unit according to the invention is designed as an axially oscillating tool spindle of a saw drive. In addition, other embodiments of machine tools are possible in which the piston unit according to the invention can be used advantageously.

Ein weiterer Aspekt der Erfindung betrifft ein Herstellverfahren gemäß Anspruch 11 für eine erfindungsgemäße Werkzeugmaschine mit einer Kolbeneinheit, bei dem in einem Teilschritt die Kolbeneinheit mit dem Kolbenbereich und dem Aufnahmebereich mit einem spanlosen Fertigungsprozess hergestellt wird. Die erfindungsgemäße Kolbeneinheit wird mit einem Guss-, Spritz-, Spritzguss-, Pulverspritzguss- oder Sinterprozess hergestellt. In besonders bevorzugter Ausführung kann der spanlose Fertigungsrozess ein sogenannter MIM-Prozess sein.Another aspect of the invention relates to a manufacturing method according to claim 11 for a machine tool according to the invention with a piston unit, wherein in a partial step, the piston unit with the piston area and the receiving area is produced with a chipless manufacturing process. The piston unit according to the invention is produced by means of a casting, injection, injection molding, powder injection molding or sintering process. In particularly preferred The chipless production process can be a so-called MIM process.

In einer besonders kostengünstigen Ausführung des Herstellverfahrens ist der Teilschritt der einzige Prozessschritt zur Herstellung der Kolbeneinheit.In a particularly cost-effective embodiment of the production method, the partial step is the only process step for producing the piston unit.

Beschreibung der ZeichnungenDescription of the drawings

Ausführungsbeispiele der Erfindung sind in den Zeichnungen dargestellt und in der folgenden Beschreibung näher erläutert. Es zeigen:

  • Figur 1 eine schematische, teilgeschnittene Seitenansicht eines Bohrhammers
  • Figur 2 eine perspektivische Ansicht einer Kolbeneinheit nach dem Stand der Technik
  • Figur 3a eine perspektivische Seitenansicht eines ersten Ausführungsbeispiels einer erfindungsgemäßen Kolbeneinheit
  • Figur 3b eine vergrößerte Detailansicht des Aufnahmebereichs der Kolbeneinheit nach Figur 3a
  • Figur 3c eine Seitenansicht des Aufnahmebereichs aus Figur 3b
  • Figur 3d eine Aussicht auf eine Schnittansicht des Aufnahmebereichs nach Linie A - A aus Figur 3c
  • Figur 3e eine Schnittansicht entlang Linie B - B aus Figur 3c
  • Figur 4a eine perspektivische Ansicht eines zweiten Ausführungsbeispiels einer Kolbeneinheit
  • Figur 4b eine Seitenansicht der Kolbeneinheit nach Figur 4a.
Embodiments of the invention are illustrated in the drawings and explained in more detail in the following description. Show it:
  • FIG. 1 a schematic, partially sectioned side view of a hammer drill
  • FIG. 2 a perspective view of a piston unit according to the prior art
  • FIG. 3a a perspective side view of a first embodiment of a piston unit according to the invention
  • FIG. 3b an enlarged detail of the receiving area of the piston unit after FIG. 3a
  • Figure 3c a side view of the receiving area FIG. 3b
  • 3d figure a prospect of a sectional view of the receiving area along line A - A from Figure 3c
  • FIG. 3e a sectional view taken along line B - B Figure 3c
  • FIG. 4a a perspective view of a second embodiment of a piston unit
  • FIG. 4b a side view of the piston unit according to FIG. 4a ,

Beschreibung der AusführungsbeispieleDescription of the embodiments

Figur 1 zeigt eine schematische Ansicht eines Bohrhammers 10 als Beispiel einer Werkzeugmaschine 10a, insbesondere einer Handwerkzeugmaschine 10b. Der Bohrhammer 10 weist ein Maschinengehäuse 12 auf. An einer vorderen Stirnseite 14 des Maschinengehäuses 12 ist ein Werkzeughalter 16 vorgesehen. Der Werkzeughalter 16 dient der Aufnahme, insbesondere der wechselbaren Aufnahme eines Werkzeugs 18. FIG. 1 shows a schematic view of a hammer drill 10 as an example of a machine tool 10a, in particular a hand tool 10b. The hammer drill 10 has a machine housing 12. At a front end face 14 of the machine housing 12, a tool holder 16 is provided. The tool holder 16 serves to receive, in particular the exchangeable receiving a tool 18th

Im Maschinengehäuse 12 ist eine Antriebsvorrichtung 20 angeordnet, welche eine Axialantriebsvorrichtung 22 umfasst. Dabei ist die Antriebsvorrichtung 20 zu einem Antrieb des Werkzeugs 18 mit diesem wirkverbunden. Die Antriebsvorrichtung 20 weist weiters einen Antriebsmotor 24, insbesondere einen Elektromotor 26 auf, welcher in Figur 1 nur angedeutet dargestellt ist. Die Axialantriebsvorrichtung 22 setzt dabei eine Rotationsbewegung 100 des Antriebsmotors 24, 26 in eine Axialbewegung, insbesondere in eine im Wesentlichen axiale Oszillationsbewegung 102 um. Diese axiale Oszillationsbewegung 102 wird über ein Koppelglied 28 einer Bewegungsübertragungseinheit 30 auf eine Kolbeneinheit 32 übertragen.In the machine housing 12, a drive device 20 is arranged, which comprises an axial drive device 22. In this case, the drive device 20 is operatively connected to a drive of the tool 18 with this. The drive device 20 further has a drive motor 24, in particular an electric motor 26, which in FIG. 1 only indicated is shown. The axial drive device 22 converts a rotational movement 100 of the drive motor 24, 26 into an axial movement, in particular into an essentially axial oscillation movement 102. This axial oscillating movement 102 is transmitted to a piston unit 32 via a coupling member 28 of a motion transmission unit 30.

Im Falle des Bohrhammers 10 ist die Kolbeneinheit 32 als ein Schlagwerkskolben 34 eines Schlagwerks 36, insbesondere eines Luftpolsterschlagwerks 38 ausgeführt. Die Kolbeneinheit 32 ist in dem Bohrhammer 10 entlang einer Werkzeugachse 40 in einem Hammerrohr 42 axial beweglich aufgenommen. Derartige Schlagwerke 36, 38 sind hinreichend bekannt, so dass auf deren Darstellung bezüglich Aufbau und Funktionsweise an dieser Stelle verzichtet wird.In the case of the hammer drill 10, the piston unit 32 is designed as a percussion piston 34 of a striking mechanism 36, in particular an air cushion impact mechanism 38. The piston unit 32 is received in the hammer drill 10 along a tool axis 40 in a hammer tube 42 axially movable. Such percussion mechanisms 36, 38 are well known, so that their representation with respect to structure and operation is omitted at this point.

Ein aus dem Hammerrohr 42 herausragender Endbereich 44 der Kolbeneinheit 32 ist als ein Aufnahmebereich 46 ausgeführt. Der Aufnahmebereich 46 weist eine Aufnahmebohrung 48 auf. In der Aufnahmebohrung 48 ist ein Koppelbolzen 50 aufgenommen. Der Koppelbolzen 50 ist dabei insbesondere drehbar beweglich in der Aufnahmebohrung gelagert. Das Koppelglied 28 der Bewegungsübertragungseinheit 30 ist in einer hier nicht dargestellten Aufnahmebohrung im Koppelbolzen 50 aufgenommen. Auf diese Weise kann eine Bewegung des Koppelglieds 28, insbesondere eine durch die axiale Oszillationsbewegung 102 verursachte Schwenkbewegung des Koppelglieds 28, welche im Wesentlichen axial entlang der Werkzeugachse 40 verläuft, auf die Kolbeneinheit 32 übertragen werden.An end portion 44 of the piston unit 32 protruding from the hammer tube 42 is designed as a receiving area 46. The receiving region 46 has a receiving bore 48. In the receiving bore 48, a coupling pin 50 is received. The coupling pin 50 is rotatably mounted in particular in the receiving bore. The coupling member 28 of the movement transmission unit 30 is received in the coupling pin 50 in a receiving bore, not shown here. This way you can a movement of the coupling member 28, in particular caused by the axial oscillatory movement 102 pivotal movement of the coupling member 28, which extends substantially axially along the tool axis 40, are transmitted to the piston unit 32.

Figur 2 zeigt eine Kolbeneinheit 32 wie sie aus dem Stand der Technik bekannt ist. Die Kolbeneinheit 32 ist dabei im Wesentlichen zylindrisch ausgeführt. Die Zylindergestalt erstreckt sich dabei entlang einer Längsachse 52. Wie aus der Darstellung in Figur 2 zu erkennen ist, weist die Kolbeneinheit 32 zwei Aufnahmebereiche 46, 47 auf. Die Aufnahmebereiche 46, 47 weisen je eine Aufnahmebohrung 48, 49 auf, wobei die Aufnahmebohrungen 48, 49 entlang einer Bohrungsachse 51, insbesondere koaxial zur Bohrungsachse 51 ausgerichtet sind. Die Bohrungsachse 51 und die Längsachse 52 spannen dabei eine erste Hauptebene 104 auf. FIG. 2 shows a piston unit 32 as known from the prior art. The piston unit 32 is designed substantially cylindrical. The cylindrical shape extends along a longitudinal axis 52. As is apparent from the illustration in FIG FIG. 2 can be seen, the piston unit 32 has two receiving areas 46, 47. The receiving areas 46, 47 each have a receiving bore 48, 49, the receiving bores 48, 49 being aligned along a bore axis 51, in particular coaxially to the bore axis 51. The bore axis 51 and the longitudinal axis 52 thereby span a first main plane 104.

Die Kolbeneinheit 32 umfasst neben den Aufnahmebereichen 46, 47 einen Kolbenbereich 54. Im vorliegenden Beispiel ist der Kolbenbereich 54 vollständig zylindrisch ausgeformt und weist einen Zylinderdurchmesser Dz auf. Die Aufnahmebereiche 46, 47 weisen jeweils eine Außenmantelfläche 58 auf, welche im Wesentlichen glatt und ohne eine Abweichung vom Zylinderdurchmesser Dz aus dem Kolbenbereich 54 hervorgeht.The piston unit 32 comprises, in addition to the receiving regions 46, 47, a piston region 54. In the present example, the piston region 54 is formed completely cylindrical and has a cylinder diameter Dz. The receiving regions 46, 47 each have an outer lateral surface 58, which emerges substantially smoothly and without a deviation from the cylinder diameter Dz from the piston region 54.

Zwischen den Aufnahmebereichen 46, 47 ist eine senkrecht zur Längsachse 52 der Kolbeneinheit und senkrecht zur der Bohrungsachse 51 verlaufende Gelenkaussparung 56 vorgesehen. Die Gelenkaussparung 56 erstreckt sich dabei im Wesentlichen parallel zur einer, auf der ersten Hauptebene 104 senkrecht stehenden und durch den Schnittpunkt der Bohrungsachse 51 und Längsachse 52 festgelegten Aussparungsebene 106. Vorzugsweise erstreckt sich die Gelenkaussparung zumindest entlang der Bohrungsachse 51 symmetrisch um die Aussparungsebene 106. Im vorliegenden Beispiel ist die Gelenkaussparung 56 als Gelenknut ausgebildet. In diese Gelenkaussparung 56 greift das Koppelglied 28 ein, wie es in Figur 1 dargestellt ist.Between the receiving areas 46, 47 a perpendicular to the longitudinal axis 52 of the piston unit and perpendicular to the bore axis 51 extending hinge recess 56 is provided. The joint recess 56 extends substantially parallel to a, on the first main plane 104 perpendicular and defined by the intersection of the bore axis 51 and the longitudinal axis 52 recess 106. Preferably, the joint recess extends at least along the bore axis 51 symmetrically about the recess plane 106. Im present example, the joint recess 56 is formed as a hinge groove. In this joint recess 56, the coupling member 28 engages, as in FIG. 1 is shown.

In der Ausführung nach Fig. 2 sind die Aufnahmebereiche 46, 47, insbesondere die Außenmantelfläche 58 in den Bereichen senkrecht zur Gelenkaussparung 56 gegenüber dem Kolbenbereich 54 im Wesentlichen eben abgestuft. Diese Abstufung verringert den Bauraumbedarf der Kolbeneinheit 32 und ermöglicht einen kürzeren Achsabstand zwischen zur Antriebsvorrichtung 20.In the execution after Fig. 2 are the receiving areas 46, 47, in particular the outer circumferential surface 58 in the areas perpendicular to the hinge recess 56th substantially planar with respect to the piston region 54. This gradation reduces the space requirement of the piston unit 32 and allows a shorter center distance between the drive device 20th

Typischerweise wird die Kolbeneinheit 32 aus einem zylindrischen Rohling hergestellt. Die Aufnahmebohrung 48 wird dabei als Bohrung eingebracht, während die Gelenkaussparung 56 zum Beispiel durch Fräsen hergestellt wird. Der so entstandene Aufnahmebereich 46 erweist sich bezüglich einer bewegten Masse der Kolbeneinheit 32 als nicht optimal.Typically, the piston unit 32 is made from a cylindrical blank. The receiving bore 48 is thereby introduced as a bore, while the joint recess 56 is produced for example by milling. The resulting receiving area 46 proves to be not optimal with respect to a moving mass of the piston unit 32.

Figur 3a zeigt ein erstes Ausführungsbeispiel einer erfindungsgemäßen Kolbeneinheit 32a in einer perspektivischen Seitenansicht. Alle gleichen oder gleichwirkenden Merkmale erhalten bei der Beschreibung des ersten Ausführungsbeispiels im Weiteren ein nachgestelltes "a". FIG. 3a shows a first embodiment of a piston unit 32a according to the invention in a perspective side view. All the same or equivalent features obtained in the description of the first embodiment hereinafter followed by a "a".

Der Kolbenbereich 54a der Kolbeneinheit 32a ist auch hier im Wesentlichen zylindrisch ausgeführt. Der Kolbenbereich 54a erstreckt sich dabei entlang der Längsachse 52a. Die Aufnahmebereiche 46a, 47a der Kolbeneinheit 32a weisen eine im Wesentlichen, insbesondere stückweise kalottenförmige, insbesondere kugelförmige Außenmantelfläche 58a auf. Dabei wird unter stückweise insbesondere verstanden, dass die Außenmantelfläche 58a im Wesentlichen bis auf die Aufnahmebohrungen 48a, 49a sowie die Gelenkaussparung 56a kalottenförmig, insbesondere kugelförmig ausgebildet ist.The piston region 54a of the piston unit 32a is also designed substantially cylindrical here. The piston region 54a extends along the longitudinal axis 52a. The receiving regions 46a, 47a of the piston unit 32a have a substantially, in particular piecemeal, in particular spherical outer lateral surface 58a. In this context, the term "piecewise" is understood in particular to mean that the outer lateral surface 58a is of a dome-shaped, in particular spherical, shape substantially up to the receiving bores 48a, 49a and the joint recess 56a.

Wie in Figur 3c am besten zu erkennen ist, ist jeder Aufnahmebereich 46a, 47a in je ein Aufnahmesegment 60a, 61a und in ein Verbindungssegment 62a, 63a unterteilt. In der bevorzugten Ausführung des ersten Ausführungsbeispiels weisen insbesondere die Aufnahmesegmente 60a, 61a die stückweise kalottenförmige, insbesondere kugelförmige Außenmantelfläche 58a auf. Da der Aufbau beider Aufnahmebereiche 46a, 47a im ersten Ausführungsbeispiel spiegelsymmetrisch zur Gelenkaussparung 56a verläuft, wird im weiteren nur ein Aufnahmebereich 46a beschrieben, wobei die Beschreibung analog auf den zweiten Aufnahmebereich 47a zu übertragen ist. Das Aufnahmesegment 60a zeichnet sich im Wesentlichen durch die stückweise kalottenförmige, insbesondere kugelförmige Außenmantelfläche 58a aus. Im Ausführungsbeispiel nach Fig. 3a ist an jedem Aufnahmesegmente 60a, 61a eine rückwärtige, ebene Stirnfläche 65a, 67a vorgesehen. Diese Stirnfläche 65a, 67a begünstigt einen kompakten Einbau der erfindungsgemäßen Kolbeneinheit 32a in die Antriebsvorrichtung 20a. Die Außenmantelfläche 58a weist eine maximale Querausdehnung 64a aus, welche kleiner ist als ein Außendurchmesser 66a des Kolbenbereichs 54a, insbesondere kleiner ist als der Zylinderdurchmesser Dz. Dabei wird unter der Querausdehnung 64a eine Quererstreckung bzw. Durchmesser senkrecht zur Längsachse 52a verstanden. Der als Verbindungssegment 62a zwischen dem Aufnahmesegment 60a und dem Kolbenbereich 54a liegende Bereich ist im Wesentlichen durch eine Einschnürung 68a gekennzeichnet. Eine Querausdehnung 70a der Einschnürung 68a ist dabei kleiner als die Querausdehnung 64a des Aufnahmesegments 62a.As in Figure 3c is best seen, each receiving area 46a, 47a is divided into a respective receiving segment 60a, 61a and in a connecting segment 62a, 63a. In the preferred embodiment of the first embodiment, in particular the receiving segments 60a, 61a, the piece-like dome-shaped, in particular spherical outer surface 58a on. Since the construction of both receiving regions 46a, 47a in the first exemplary embodiment is mirror-symmetrical to the joint recess 56a, only one receiving region 46a will be described below, the description being analogous to the second receiving region 47a. The receiving segment 60a is essentially characterized by the piece-wise dome-shaped, in particular spherical, outer lateral surface 58a. In the embodiment to Fig. 3a At each receiving segment 60a, 61a a rear, flat end face 65a, 67a is provided. This end face 65a, 67a favors a compact installation of the piston unit 32a according to the invention into the drive device 20a. The outer lateral surface 58a has a maximum transverse dimension 64a which is smaller than an outer diameter 66a of the piston region 54a, in particular smaller than the cylinder diameter Dz. In this case, the transverse extent 64a is understood to mean a transverse extent or diameter perpendicular to the longitudinal axis 52a. The region lying as the connecting segment 62a between the receiving segment 60a and the piston region 54a is substantially characterized by a constriction 68a. A transverse extent 70a of the constriction 68a is smaller than the transverse extent 64a of the receiving segment 62a.

Die Figuren 3d und 3e zeigen zwei verschiedene Schnitte durch den Endbereich 44a der Kolbeneinheit 32a nach dem ersten Ausführungsbeispiel. Dabei wird insbesondere aus Figur 3d nochmals die stückweise kalottenförmige, insbesondere die stückweise kugelförmige Gestalt der Außenmantelfläche 58a der Aufnahmesegmente 60a deutlich.The Figures 3d and 3e show two different sections through the end portion 44a of the piston unit 32a according to the first embodiment. This is in particular from 3d figure again the piecewise dome-shaped, in particular the piecewise spherical shape of the outer circumferential surface 58a of the receiving segments 60a clearly.

In Figur 4a ist ein zweites Ausführungsbeispiel einer Kolbeneinheit 32b gezeigt. Alle zu den im Vorhergehenden beschriebenen Beispiel gleichen oder gleichwirkenden Merkmale erhalten bei der Beschreibung im Weiteren ein nachgestelltes "b".In FIG. 4a a second embodiment of a piston unit 32b is shown. All the same or equivalent features to those described above are given a "b" in the description below.

Die Kolbeneinheit 32b unterscheidet sich dabei von dem ersten Ausführungsbeispiel der Kolbeneinheit 32a insbesondere in ihren Aufnahmebereichen 46b, 47b. Da der Aufbau beider Aufnahmebereiche 46b, 47b im ersten Ausführungsbeispiel spiegelsymmetrisch zur Gelenkaussparung 56b verläuft, wird im weiteren nur ein Aufnahmebereich 46b beschrieben, wobei die Beschreibung analog auf den zweiten Aufnahmebereich 47b zu übertragen ist.The piston unit 32b differs from the first embodiment of the piston unit 32a, in particular in their receiving areas 46b, 47b. Since the construction of both receiving areas 46b, 47b in the first exemplary embodiment is mirror-symmetrical to the hinge recess 56b, only one receiving area 46b will be described below, the description being analogous to the second receiving area 47b.

Das Aufnahmesegment 60b weist eine im Wesentlichen zylindrische Außenmantelfläche 58b auf. Im Ausführungsbeispiel nach Fig. 4a ist an jedem Aufnahmesegment 60b, 61b eine rückwärtige, ebene Stirnfläche 65b, 67b vorgesehen. Diese Stirnfläche 65b, 67b begünstigt einen kompakten Einbau der erfindungsgemäßen Kolbeneinheit 32b in die Antriebsvorrichtung 20b. Auch im Aufnahmesegmenten 60b ist eine bereits aus dem ersten Ausführungsbeispiel bekannte Aufnahmebohrung 48b vorgesehen. Die Außenmantelfläche 58b erstreckt sich im Wesentlichen zylindrisch um die Aufnahmenbohrung 48b, insbesondere ist Sie nahezu koaxial um die Bohrungsachse 51b ausgebildet. Das Aufnahmesegmente 60b erscheint dadurch im Wesentlichen ösenartig ausgeführt.The receiving segment 60b has a substantially cylindrical outer circumferential surface 58b. In the embodiment according to Fig. 4a On each receiving segment 60b, 61b, a rear, flat end face 65b, 67b is provided. This end face 65b, 67b favors a compact installation of the piston unit 32b according to the invention in the drive device 20b. Also in the receiving segment 60b is already known from the first embodiment receiving bore 48b is provided. The outer circumferential surface 58b extends substantially cylindrically around the receiving bore 48b, in particular, it is formed almost coaxially around the bore axis 51b. The receiving segment 60b thereby appears to be essentially loop-shaped.

In ihrer Funktion unterscheiden sich die beiden Ausführungsbeispiele einer Kolbeneinheit 32a, 32b nicht von der Kolbeneinheit 32 nach dem Stand der Technik, so dass auf eine Beschreibung verzichtet und auf den bekannten Stand der Technik verwiesen wird.In their function, the two embodiments of a piston unit 32a, 32b are not different from the piston unit 32 according to the prior art, so that dispenses with a description and reference is made to the known prior art.

Für eine besonders geringe träge Masse der erfindungsgemäßen Kolbeneinheit 32a, 32b wird diese auf Basis eines Leichtmetalls wie Aluminium oder Magnesium oder aber einer entsprechenden Leichtmetalllegierung hergestellt.For a particularly low inertial mass of the piston unit 32a, 32b according to the invention, this is produced on the basis of a light metal such as aluminum or magnesium or a corresponding light metal alloy.

Die Kolbeneinheit 32a, 32b des ersten Ausführungsbeispiels einer erfindungsgemäßen Kolbeneinheit lässt sich unter anderem besonders einfach unter Verwendung einer Drehbearbeitung eines zylindrischen Ausgangskörpers herstellen. Darüber hinaus ist es möglich, die Kolbeneinheit 32a, 32b mit dem Kolbenbereich 54a, 54b und den Aufnahmebereichen 46a, 47a, 46b, 47b durch einen Guss-, Spritz-, Spritzguss-, Pulverspritzguss- oder Sinterprozess herzustellen. Insbesondere könnte hier ein sogenannter MIM-Prozess vorteilhaft eingesetzt werden. Bevorzugter Weise ist es in diesen Prozessen möglich, ohne weitere Prozessschritte eine Kolbeneinheit 32a, 32b herzustellen.The piston unit 32a, 32b of the first embodiment of a piston unit according to the invention can be produced, among other things, particularly simply by using a turning operation of a cylindrical starting body. Moreover, it is possible to manufacture the piston unit 32a, 32b with the piston portion 54a, 54b and the receiving portions 46a, 47a, 46b, 47b by a casting, injection, injection molding, powder injection molding or sintering process. In particular, a so-called MIM process could be advantageously used here. It is preferably possible in these processes to produce a piston unit 32a, 32b without further process steps.

Über die hier gezeigten Ausführungsbeispiele hinaus können durch Kombination der hier beschriebene Merkmal weitere vorteilhafte Ausführungen einer erfindungsgemäße Kolbeneinheit 32a, 32b erhalten werden.Beyond the exemplary embodiments shown here, further advantageous embodiments of a piston unit 32a, 32b according to the invention can be obtained by combining the feature described here.

Insbesondere ist die Erfindung nicht auf Kolbeneinheiten 32a, 32b mit jeweils zwei, insbesondere zwei symmetrisch ausgebildete Aufnahmebereiche 46a, 47a, 46b, 47b beschränkt. In einer besonders leichten Ausführung einer erfindungsgemäßen Kolbeneinheit 32a, 32b kann diese nur einen Aufnahmebereich 46a, 46b aufweisen. Dabei ist es möglich, den Aufnahmebereich 46a, 46b entweder wie in den beschriebenen Beispielen gezeigt so auszuführen, dass das Koppelglied 28 der Bewegungsübertragungseinheit 30 analog zu den hier bekannten Beispielen nahezu koaxial zur Längsachse 52a, 52b angreift. Dabei kann vorgesehen sein, dass der Koppelbolzen 50 mit dem Aufnahmebereich 46a, 46b oder dem Koppelglied 28 verbunden, insbesondere fest verbunden oder einstückig ausgeführt ist. Alternativ kann auch vorgesehen sein, dass der Aufnahmebereich 46a, 46b selbst nahezu die erste Hauptebene aus Bohrungsachse 51 und Längsachse 52a, 52b derart einschließt, dass der Aufnahmebereich 52a, 52b sich nahezu symmetrisch um die Längsachse erstreckt. Hierbei kann es vorteilhaft sein, dass das Koppelglied 28 den Aufnahmebereich 46a, 46b umgreift.In particular, the invention is not limited to piston units 32a, 32b each having two, in particular two symmetrically shaped receiving areas 46a, 47a, 46b, 47b. In a particularly lightweight embodiment of a piston unit 32a, 32b according to the invention, this can only one Receiving area 46a, 46b have. In this case, it is possible to carry out the receiving region 46a, 46b either as shown in the examples described in such a way that the coupling member 28 of the motion transfer unit 30 engages almost coaxially with the longitudinal axis 52a, 52b analogously to the examples known here. It can be provided that the coupling pin 50 is connected to the receiving area 46a, 46b or the coupling member 28, in particular firmly connected or made in one piece. Alternatively, provision may also be made for the receiving area 46a, 46b itself to include almost the first main plane of the bore axis 51 and the longitudinal axis 52a, 52b in such a way that the receiving area 52a, 52b extends almost symmetrically about the longitudinal axis. In this case, it may be advantageous for the coupling member 28 to encompass the receiving region 46a, 46b.

Claims (12)

  1. Power tool having a drive device (20) which comprises at least one axial drive device (22) for driving a tool (18), wherein the axial drive device (22) has a motion-transmitting unit (30), comprising a coupling member (28), and a piston unit (32, 32a, 32b) having an accommodating region (46, 47, 46a, 47a, 46b, 47b) and a piston region (54, 54a, 54b) with a longitudinal axis (52, 52a, 52b), wherein the coupling member (28) of the motion-transmitting unit (30) is connected in the accommodating region (46, 47, 46a, 47a, 46b, 47b) to the piston unit (32, 32a, 32b) via a coupling pin (50), wherein the accommodating region (46a, 47a, 46b, 47b) has at least one accommodating segment (60a, 60b, 61a, 61b) of substantially dome-shaped design and a connecting segment (62a, 62b, 63a, 63b), wherein the accommodating segment (60a, 60b, 61a, 61b) is connected to the piston region (54a, 54b) via the connecting segment (62a, 62b, 63a, 63b), characterized in that the connecting segment (62a, 62b, 63a, 63b) has a constriction (68a) which is distinguished by a transverse extent (70a, 70b) which is directed perpendicularly to the longitudinal axis (52a, 52b) of the piston unit (32a, 32b) and which is smaller than a transverse extent (64a, 64b), directed perpendicularly to the longitudinal axis (52a, 52b) of the piston unit (32a, 32b), of the accommodating segment (60a, 61a, 60b, 61b).
  2. Power tool according to Claim 1, characterized in that the accommodating segment (60a, 60b, 61a, 61b) has a substantially spherical outer lateral surface (58a, 58b).
  3. Power tool according to Claim 1, characterized in that the accommodating segment (60a, 60b, 61a, 61b) is designed substantially as a circular ring having a substantially cylindrical outer lateral surface (58a, 58b).
  4. Power tool according to at least one of the preceding claims, characterized in that the accommodating segment (60a, 60b, 61a, 61b) has an accommodating bore (48a, 49a, 48b, 49b), in particular an accommodating bore (48a, 49a, 48b, 49b) disposed perpendicularly to the longitudinal axis (52a, 52b) of the piston unit (32a, 32b) for accommodating the piston pin (50).
  5. Power tool according to at least one of the preceding claims, characterized in that the accommodating region (46a, 47a, 46b, 47b) has a joint recess (56a, 56b) which runs in a recess plane (106a, 106b) which is perpendicular to the longitudinal axis (52a, 52b) of the piston unit (32a, 32b).
  6. Power tool according to at least one of the preceding claims, characterized in that two accommodating segments (60a, 60b, 61a, 61b) arranged in particular symmetrically about the longitudinal axis (52a, 52b) of the piston unit (32a, 32b) and preferably designed in mirror symmetry are provided, said accommodating segments (60a, 60b, 61a, 61b) being connected to the piston region (54a, 54b) via one connecting segment (62a, 62b, 63a, 63b) each.
  7. Power tool according to at least one of the preceding claims, characterized in that the accommodating region (46a, 46b, 47a, 47b), in particular the accommodating segment (60a, 60b, 61a, 61b), has a transverse extent (64a, 64b) which is perpendicular to the longitudinal axis (52a, 52b) of the piston unit (32a, 32b) and which is smaller than a diameter (66a) of the piston region.
  8. Power tool according to at least one of the preceding claims, characterized in that the piston region (54a, 54b) and the accommodating region (46a, 46b, 47a, 47b) of the piston unit (32a, 32b) are embodied in one piece.
  9. Power tool according to at least one of the preceding claims, characterized in that the piston unit (32a, 32b) consists of a metallic material, in particular an aluminium- or magnesium-based light metal or a corresponding light metal alloy.
  10. Power tool according to at least one of the preceding claims, characterized in that the axial drive device (22) is a percussion mechanism (36), in particular an air cushion percussion mechanism (38), and in that the piston unit (32a, 32b) is a percussion mechanism piston (34).
  11. Method for producing a power tool having a piston unit (32a, 32b) according to at least one of the preceding claims, wherein, in a partial step, the piston unit (32a, 32b) having the piston region (54a, 54b) and the accommodating region (46a, 46b, 47a, 47b) is produced using a non-cutting production process, wherein the non-cutting production process is a casting, injection, injection-moulding, powder injection-moulding or sintering process.
  12. Production method according to Claim 11, characterized in that the partial step is the only process step for producing the piston unit (32a, 32b).
EP09164985A 2008-09-09 2009-07-09 Machine tool and method for producing same Active EP2161108B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102008041889A DE102008041889A1 (en) 2008-09-09 2008-09-09 Machine tool and manufacturing method for a machine tool

Publications (2)

Publication Number Publication Date
EP2161108A1 EP2161108A1 (en) 2010-03-10
EP2161108B1 true EP2161108B1 (en) 2011-05-18

Family

ID=41009945

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09164985A Active EP2161108B1 (en) 2008-09-09 2009-07-09 Machine tool and method for producing same

Country Status (4)

Country Link
EP (1) EP2161108B1 (en)
CN (1) CN101670453B (en)
AT (1) ATE509738T1 (en)
DE (1) DE102008041889A1 (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011003646A1 (en) * 2009-07-09 2011-01-13 Robert Bosch Gmbh Hammer-drilling and/or cutting device

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2038986B (en) * 1978-12-13 1983-05-05 Black & Decker Inc Converting rotary motion to reciprocatory motion
JP2552566B2 (en) * 1990-04-05 1996-11-13 株式会社マキタ Impact tool
GB9524180D0 (en) * 1995-11-27 1996-01-31 Black & Decker Inc Hammer mechanism
DE19726272A1 (en) * 1997-06-20 1999-01-07 Wacker Werke Kg Single-sided air spring striking mechanism with idle condition
DE19828423C2 (en) * 1998-06-25 2000-05-18 Wacker Werke Kg Driving piston for an air spring hammer mechanism
GB2394437A (en) * 2002-10-23 2004-04-28 Black & Decker Inc Hammer including a piston with wear-reducing washers
DE102007010181A1 (en) * 2007-03-02 2008-09-04 Robert Bosch Gmbh Hand tool comprises a striking unit with a hammer piston having a contact point and an active base surface forming an axial distance

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011003646A1 (en) * 2009-07-09 2011-01-13 Robert Bosch Gmbh Hammer-drilling and/or cutting device
DE102009027560A1 (en) * 2009-07-09 2011-01-13 Robert Bosch Gmbh Hammer drill and / or chisel device

Also Published As

Publication number Publication date
DE102008041889A1 (en) 2010-03-11
CN101670453A (en) 2010-03-17
ATE509738T1 (en) 2011-06-15
CN101670453B (en) 2015-03-11
EP2161108A1 (en) 2010-03-10

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