EP2161108A1 - Machine-outil et procédé de fabrication pour une machine-outil - Google Patents

Machine-outil et procédé de fabrication pour une machine-outil Download PDF

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Publication number
EP2161108A1
EP2161108A1 EP09164985A EP09164985A EP2161108A1 EP 2161108 A1 EP2161108 A1 EP 2161108A1 EP 09164985 A EP09164985 A EP 09164985A EP 09164985 A EP09164985 A EP 09164985A EP 2161108 A1 EP2161108 A1 EP 2161108A1
Authority
EP
European Patent Office
Prior art keywords
receiving
piston
piston unit
machine tool
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.)
Granted
Application number
EP09164985A
Other languages
German (de)
English (en)
Other versions
EP2161108B1 (fr
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
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2161108A1 publication Critical patent/EP2161108A1/fr
Application granted granted Critical
Publication of EP2161108B1 publication Critical patent/EP2161108B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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.
  • the machine tool according to the invention with the features of the main claim has the advantage that at the same capacity of the axial drive device for driving the tool lower mass forces occur in the reversal points of the oscillatory motion.
  • the receiving area 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.
  • 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 piston area at any point is equal to or greater than the diameter of the piston area.
  • the connecting segment has a constriction, which is characterized by a transverse dimension directed perpendicularly to the longitudinal axis of the piston area, which is smaller than a transverse extent of the receiving segment directed perpendicular to the longitudinal axis of the piston area, a further advantageous embodiment of the piston unit is achieved.
  • the constriction has a substantially concave surface profile, viewed from a lateral surface 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.
  • a further aspect of the invention relates to a production method for a machine tool according to the invention with a piston unit, in which the piston unit with the piston area and the receiving area is produced in a partial step with a non-cutting production process.
  • a piston unit according to the invention can be 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 molding, 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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gripping On Spindles (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Actuator (AREA)
EP09164985A 2008-09-09 2009-07-09 Machine-outil et procédé de fabrication pour une machine-outil Active EP2161108B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102008041889A DE102008041889A1 (de) 2008-09-09 2008-09-09 Werkzeugmaschine und Herstellverfahren für eine Werkzeugmaschine

Publications (2)

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

Family

ID=41009945

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09164985A Active EP2161108B1 (fr) 2008-09-09 2009-07-09 Machine-outil et procédé de fabrication pour une machine-outil

Country Status (4)

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

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2038986A (en) * 1978-12-13 1980-07-30 Black & Decker Inc Converting rotary motion to reciprocatory motion
DE4111127A1 (de) * 1990-04-05 1991-10-10 Makita Corp Schlagwerkzeug
EP0775556A1 (fr) * 1995-11-27 1997-05-28 Black & Decker Inc. Mécanisme de marteau
WO1998058773A2 (fr) * 1997-06-20 1998-12-30 Wacker-Werke Gmbh & Co. Kg Mecanisme de percussion pneumatique unilateral avec possibilite de passage en marche a vide
WO1999067063A1 (fr) * 1998-06-25 1999-12-29 Wacker-Werke Gmbh & Co. Kg Piston d'entrainement pour dispositif de percussion pneumatique
EP1413401A1 (fr) * 2002-10-23 2004-04-28 Black & Decker Inc. Ensemble de piston et tourillion dans un marteau perforateur et leur procédé de montage
DE102007010181A1 (de) * 2007-03-02 2008-09-04 Robert Bosch Gmbh Handwerkzeugmaschine

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009027560A1 (de) * 2009-07-09 2011-01-13 Robert Bosch Gmbh Bohrhammer- und/oder Meißelgerät

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2038986A (en) * 1978-12-13 1980-07-30 Black & Decker Inc Converting rotary motion to reciprocatory motion
DE4111127A1 (de) * 1990-04-05 1991-10-10 Makita Corp Schlagwerkzeug
EP0775556A1 (fr) * 1995-11-27 1997-05-28 Black & Decker Inc. Mécanisme de marteau
WO1998058773A2 (fr) * 1997-06-20 1998-12-30 Wacker-Werke Gmbh & Co. Kg Mecanisme de percussion pneumatique unilateral avec possibilite de passage en marche a vide
WO1999067063A1 (fr) * 1998-06-25 1999-12-29 Wacker-Werke Gmbh & Co. Kg Piston d'entrainement pour dispositif de percussion pneumatique
EP1413401A1 (fr) * 2002-10-23 2004-04-28 Black & Decker Inc. Ensemble de piston et tourillion dans un marteau perforateur et leur procédé de montage
DE102007010181A1 (de) * 2007-03-02 2008-09-04 Robert Bosch Gmbh Handwerkzeugmaschine

Also Published As

Publication number Publication date
ATE509738T1 (de) 2011-06-15
CN101670453B (zh) 2015-03-11
DE102008041889A1 (de) 2010-03-11
EP2161108B1 (fr) 2011-05-18
CN101670453A (zh) 2010-03-17

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