EP2307172A1 - Dispositif de percussion - Google Patents

Dispositif de percussion

Info

Publication number
EP2307172A1
EP2307172A1 EP09779566A EP09779566A EP2307172A1 EP 2307172 A1 EP2307172 A1 EP 2307172A1 EP 09779566 A EP09779566 A EP 09779566A EP 09779566 A EP09779566 A EP 09779566A EP 2307172 A1 EP2307172 A1 EP 2307172A1
Authority
EP
European Patent Office
Prior art keywords
unit
piston
transmission
wobble
impact device
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
EP09779566A
Other languages
German (de)
English (en)
Other versions
EP2307172B1 (fr
Inventor
Thomas Bernhardt
Tobias Herr
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 EP2307172A1 publication Critical patent/EP2307172A1/fr
Application granted granted Critical
Publication of EP2307172B1 publication Critical patent/EP2307172B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25DPERCUSSIVE TOOLS
    • B25D11/00Portable percussive tools with electromotor or other motor drive
    • B25D11/06Means for driving the impulse member
    • B25D11/062Means for driving the impulse member comprising a wobbling mechanism, swash plate
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25DPERCUSSIVE TOOLS
    • B25D17/00Details of, or accessories for, portable power-driven percussive tools
    • B25D17/06Hammer pistons; Anvils ; Guide-sleeves for pistons

Definitions

  • the invention relates to a percussion device according to the preamble of claim 1.
  • the impact device comprises a percussion unit, which has a piston unit, a transmission unit which has a swash bearing, which is intended to transmit a movement to the percussion unit, and a transmission element between the transmission unit and the piston unit.
  • the invention relates to a percussion device, in particular for a rotary and / or chisel hammer, with a percussion unit having a piston unit, a transmission unit which has a swash bearing and which is provided for transmitting a movement to the percussion unit, and a transmission element between the transmission unit and the piston unit.
  • the transmission element has a force flow direction with a component which is opposite to a direction of force flow of the wobble leg.
  • the term "intended” should be understood to mean, in particular, specially designed and / or specially equipped Unit are understood, which is provided in the operation of the power tool to generate a shock pulse and to transfer the impact pulse to a tool.
  • the piston unit can be formed both by a piston alone, such as a pot piston, and by a plurality of components, such as a hammer piston, a connecting rod and / or another, the skilled person appear appropriate element.
  • the term "between” is to be understood as meaning, in particular, an arrangement, in particular of the transmission element, along a direction of force flow between two components, in particular between the transmission unit and the piston unit be understood by a component and / or an element in the operation of the percussion device, wherein under a "force flow” in particular a path of a force and / or torque in a component, in particular in the transmission element, from a point of application or a point of force introduction to an exit point or up to a point at which the force and / or the moment is absorbed by a reaction force and / or a reaction torque is to be understood
  • the transmission element may be formed as a separate component or from the
  • Piston unit and / or be included by the transmission unit Piston unit and / or be included by the transmission unit.
  • a one-piece construction of the transmission element with the piston unit and / or the transmission unit is also conceivable, whereby "integral” should be understood to be in one piece and / or formed from a cast and / or formed as a component to a force flow direction ", in particular, be understood that the direction of force flow of the transmission element has a component of non-zero parallel to the direction of force flow of the wobble leg.
  • a particularly space-saving and compact impact device or hand tool, and in particular by a lever length of the wobble leg can advantageously be extended constructively simple up to a desired stroke of the piston and a force by means of
  • Transmission element advantageous to the piston unit is transferable.
  • the power flow direction of the transmission element extends from outside to inside along a radial direction of the piston unit.
  • a "radial direction” should be understood to mean, in particular, a direction which extends radially outward and / or inward along a cross-sectional area of the piston unit from a central axis of the piston unit Taumelschenkel on the piston unit, in particular on a piston of the piston unit, can be passed.
  • the transmission element has a contact point with the transmission unit, which is arranged on a side of the piston unit facing away from the swash-bearing of the transmission unit.
  • a "side of the piston applied to the swash bearing” should be understood to mean, in particular, a side and / or a region of the piston that, at least partially, faces the piston away from a swash-bearing in a direction away from a center axis of the piston
  • an “attachment point” should be understood to mean, in particular, a point and / or a point which is provided for transmitting a movement and / or a force flow between the transfer unit and the transfer element and / or the piston unit
  • Impact device of the bearing point can move relative to the central axis of the piston due to a wobbling movement of the transmission unit.
  • the inventive design can be a great leverage in the transmission of a drive movement and thus a large piston stroke and a high impact speed during operation of the drill and / or hammer tiller, especially at a constant or almost constant center distance between the piston and a Rotation axis of an intermediate shaft or a wobble bearing can be achieved.
  • an angular range covered by the moving wobble limb during operation of the wobble bearing to achieve a desired stroke movement of a piston can be reduced, and thus a possible unbalance during operation of the handheld power tool can at least be reduced or prevented.
  • assembly of the piston unit can be simplified by the position of the transmission bolt or incorrect assembly of the piston unit can be prevented.
  • the contact point is arranged outside an inner cross section of the piston unit.
  • an "inner cross-section” is to be understood in particular a cross-sectional area and / or a diameter which extends and / or within a wall, in particular a cylindrical wall, of the piston, in particular a pot piston, in particular transversely to a main direction of extension of the piston and and / or is delimited by an inwardly facing side of the wall,
  • This embodiment particularly advantageously makes possible a compact and, in particular, short-built impact device or hand-held power tool.
  • an "outer cross-section" is to be understood in particular a cross-sectional area and / or a diameter which is bounded by an outwardly facing surface of a wall, in particular a cylindrical wall, of the piston, in particular of a pot piston, and / or. or extending inwardly from the outwardly facing surface of the wall, in particular transverse to a main extension direction of the piston.
  • a particularly advantageous and in particular structurally simple bridging a varying in operation of the drill and / or chisel hammer height difference between the piston, in particular a side facing away from the swash bearing of the piston, and the transmission unit, in particular a bearing point on a side facing away from the swash bearing end of a Taumelschenkels can be achieved when the transmission element is mounted at least partially movable on the transmission unit.
  • the transmission unit particularly advantageously has at least one bearing and / or guide means for movably supporting and / or guiding the transmission element.
  • a particularly short length of the impact device and thus of the power tool can advantageously be achieved if the transmission unit has at least one wobble leg which is guided past an axial extent of the piston unit next to the piston unit.
  • “beside” is meant in particular that a shortest distance between the wobble leg and the piston unit is aligned perpendicular to a main extension, along the axial extent, in particular a length of the piston unit, and preferably greater than a radius of a piston
  • the tympanic limb can be embodied in particular fixedly and / or resiliently with the wobble bearing.
  • the transmission unit has at least two wobble legs, which are guided past an axial extent of the piston unit next to the piston unit.
  • an advantageous force distribution during operation of the impact device or of the drill and / or chisel hammer can be achieved during a power transmission from the transmission unit to the impact mechanism unit. It can be reduced in this case a point load of individual components and thus a lifetime of the individual components can be advantageously increased.
  • the transmission unit has at least one bearing element and the contact point between the bearing element and the transmission element is arranged, whereby an advantageous power transmission during operation of the drill and / or chisel hammer can be achieved.
  • the bearing element may in this case be formed by a separate component or at least partially formed integrally with the piston unit or a component of the transmission unit.
  • the bearing element is provided for receiving translational and / or particularly advantageous for receiving rotational forces and in particular spatially and / or temporally oscillating forces.
  • the bearing element is preferably formed by a movably mounted bolt, a joint unit and / or further components that appear to be useful to a person skilled in the art, for example a bearing component.
  • Transmission element may be formed by a separate component or at least partially formed in one piece with the at least one wobble legs.
  • the bearing element together with the at least one wobble limb, span a plane which is in at least one plane
  • an "almost complete cross-sectional area” is understood in particular to mean that at least 83% of the cross-sectional area, preferably at least 94% and particularly preferably 100% of the cross-sectional area of the piston pierces the plane spanned by the at least one wobble limb together with the bearing element
  • a particularly space-saving arrangement of the impact device with a particularly short overall length can be achieved in a structurally simple manner.
  • the bearing element is aligned substantially transversely to a main extension direction of the wobble limb.
  • substantially transversely is to be understood here in particular that the bearing element, in particular a main extension direction and / or a force flow direction of the bearing element, an angle to the main extension direction of the Taumelschenkels includes, which is between 70 ° and 110 °, advantageously between - See 75 ° and 105 ° and is more preferably between 83 ° and 97 ° ..
  • the embodiment of the invention can advantageously be reduced stress on bearings and / or in particular inexpensive bearing components are used its long-term be formed, as may be advantageous for example in a transmission unit with two wobble legs.
  • the impact device according to the invention can be used particularly advantageously in a hand-held power tool, in particular a rotary and / or chisel hammer.
  • FIG. 1 shows a drill and / or chisel hammer with a percussion device in a schematic side view
  • FIG. 3 shows a first embodiment of the impact device with a bearing element formed by a bolt in a perspective view
  • FIG. 4 shows a second embodiment of the impact device with a bearing element formed by a joint unit in a perspective view
  • FIG. 5 shows the impact device from FIG. 4 in a sectional illustration
  • FIG. 6 shows the impact device from FIG. 4 in a plan view.
  • FIG. 1 shows a hand-held power tool formed by a drill and / or chisel hammer 12.
  • the drill and / or chisel hammer 12 has a housing 58 and a tool holder 60 for receiving a drill and / or chisel tool 12, not shown.
  • On a side 62 facing away from the tool holder 60, the drill and / or chisel hammer 12 has a main handle 64 integrated in the housing 58.
  • the drill and / or bit Hammer 12 also has an impact device 10, which is a percussion unit 14, which is provided for generating and transmitting a shock pulse to the drilling and / or chiseling tool, and a transmission unit 18, which is used to transmit a drive torque to the percussion unit 14th is provided.
  • the drive torque is generated by a motor unit 66 during operation of the drill and / or chisel hammer 12 and via an unspecified motor shaft of the motor unit 66 to an intermediate shaft 68 and from there via the transmission unit 18 to the percussion unit 14 and / or via a gear stage a rotating output means, such as the hammer tube 70, transferred to a rotation of the drilling and / or chiselling tool.
  • the transmission unit 18 has a wobble bearing 36 which is mounted on the intermediate shaft 68.
  • FIGS. 2 and 3 show a first exemplary embodiment of the impact device 10 from FIG.
  • the percussion unit 14 has a piston unit 16 with a piston 48 formed by a pot piston, which is mounted axially movably in the hammer tube 70 of the impact mechanism unit 14.
  • the percussion unit 14 or the piston unit 16 has a transmission element 24, via which a power transmission from the transmission unit 18 to the percussion unit 14 or to the piston unit 16 during operation of the drill and / or chisel hammer 12 takes place.
  • the transmission element 24 is arranged along a force flow between the transmission unit 18 and the piston 48 of the piston unit 16.
  • a force flow direction 26 of the transmission element 24 in this case has a component which corresponds to the force flow directions 28,
  • the transmission element 24 is arranged on a side facing away from the swash bearing 36 side 38 of the piston 48, wherein the transmission element 24 along a direction 72 from a rotation axis 74 of the intermediate shaft 68 (not shown in Figures 2 and 3) in the direction of a longitudinal axis or a central axis 76 of the piston unit 16 is aligned substantially parallel to the direction 72 and extends away from the piston 48.
  • the power flow direction 26 of the transmission element 24 in this case extends along a radial direction 32 of the piston unit 16 from outside to inside.
  • the transfer element 24 has with the transfer unit 18 a contact point 34 which is arranged on the side facing away from the swash bearing 36 side 38 of the piston unit, wherein the contact point 34 along the radial direction 32 outside an inner cross section 40 and also outside an outer cross section 42 of the piston 48 of Piston unit 16 is arranged.
  • the inner cross section 40 and the outer cross section 42 of the piston 48 are characterized by a zylinderförmi-
  • the inner cross-section 40 is formed by an inner diameter of a cylindrical wall 80 and the outer cross-section 42 by an outer diameter of the cylindrical wall 80 of the cylindrical Aufhahmebe- rich 78 of the piston 48.
  • the cylindrical receiving area 78 is provided for holding a racket and a compression means formed by air.
  • the transmission element 24 is arranged and fixedly connected to the piston 48, the transmission element 24 being screwed to the fastening element (see FIG. 3).
  • the transmission element 24 is integrally formed with the fastening element 84, is pressed with the fastening element 84 and / or by means of a further, the skilled person seems appropriate sense of attachment to the fastener 84 is arranged.
  • the transmission unit 18 has the two wobble legs 20, 22, which are at least partially formed integrally with the swash bearing 36.
  • the swash bearing 36 has a ball bearing and is provided for converting a rotational movement of the intermediate shaft 68 into an axial movement of the piston 48.
  • the two wobble legs 20, 22 extend from the wobble bearing 36 viewed from the rotation axis 74 of the intermediate shaft 68 in the direction 72 of the piston 48, the wobble legs 20, 22 extending substantially perpendicular to an axis 86 of an outer ring 88 of the wobble bearing 36.
  • the two wobble legs 20, 22 are also arranged along a circumferential direction 90 of the outer ring 88 on two opposite sides 92 on the outer ring 88 and formed integrally therewith.
  • the transmission unit 18 also has a bearing element 46, which is aligned substantially transversely to a main extension direction 54, 56 of the wobble legs 20, 22.
  • the bearing element 46 is bolt-shaped and forms, together with the two wobble legs 20, 22, two bearing points 94, 96.
  • the two wobble legs 20, 22 on an end 98, 100 facing away from the swash bearing 36 each have an integrally formed with the wobble legs 20, 22 annular Lageraufhahme 102, 104, in which the bearing element 46 is rotatably mounted about a longitudinal axis 106 of the bearing member 46 ,
  • the bearing element 46 has in a central region 108 along its longitudinal axis 106, a bore 110, which is aligned substantially transverse to the longitudinal axis 106.
  • the transmission element 24 is movably mounted on the transmission unit 18, so that the contact point 34 is arranged for transmitting power between the transmission unit 18 and the piston unit 16 and the piston 48 between the bearing element 46 and the transmission element 24 ( Figure 3).
  • Transmission pin 24 is in this case aligned in at least one operating position substantially parallel to a main extension direction 54, 56 of a wobble leg 20, 22 of the transmission unit 18, wherein in this case the force flow direction 26 of the transmission element 24 of the force flow direction 28, 30 of one of the two wobble legs 20, 22 is directed opposite.
  • the piston 48 driven by the transfer unit 18, moves periodically from a first end position facing the tool holder 60 into a second end position facing away from the tool holder 60 and back again.
  • both wobble legs 20, 22 are in a first end position facing the tool housing 60.
  • the two wobble legs 20, 22 are sequentially moved out of their first end position in a transition from the first end position to the second end position, so that the wobble legs 20, 22 along an axial direction 50 of the piston 48 are at different positions.
  • the bearing element 46 is also rotated relative to the transmission element 24 about a longitudinal axis 112 of the transmission element 24.
  • the two ends 98, 100 of the wobble legs 20, 22 facing away from the swash bearing 36 describe a movement along a circular arc, so that the movable mounting of the transmission element 24 causes a varying height difference between the piston 48 and the transmission element 24 and also a varying orientation Tumble legs 20, 22 are balanced with respect to the central axis 76 during a power transmission.
  • Only in the second end position of the piston 48 are the two wobble legs 20, 22 again along the axial direction 50 of the piston 48 in a common end position. A transition from the second end position to the first end position of the piston 48 is analogous to the transition of the first to the second end position.
  • FIGS. 4 to 6 show an alternative embodiment. Substantially identical components, features and functions are basically numbered by the same reference numerals. To distinguish the embodiments, the letter a is added in the reference numerals of Figures 4 to 6. The following description is essentially limited to the differences from the exemplary embodiment in FIG. 3, with respect to more constant ones
  • FIG. 4 shows an alternatively configured impact device 10a.
  • a transmission unit 18a and a percussion unit 14a of the impact device 10a are shown in a first end position (shown in dashed lines) and in a second end position, wherein a piston 48a of a piston unit 16a of the percussion unit 14a is mounted in a hammer tube 70a.
  • the transmission unit 18a has two wobble legs 20a, 22a and a wobble bearing 36a.
  • the impact device 10a also has a transmission element 24a, which in use has a force flow direction 26a with a component which is opposite to a force flow direction 28a of the wobble limbs 20a, 22a.
  • the transmission element 24a is also arranged on a side facing away from the swash bearing 36a side 38a of the piston unit 16a and the piston 48a.
  • the transmission element 24a is arranged on the piston 48a on a fastening sleeve 130a arranged on a side 82a facing away from a cylindrical receiving region 78a along an axial direction 50a of the piston unit 16a or of the piston 48a.
  • the transmission element 24a is also screwed to the mounting sleeve 130a by means of a screw 132a.
  • the transmission element 24a has a stepped shape, with a step 134a of the transmission element 24a between a first partial region 136a arranged in the fastening sleeve 130a and a second partial region 138a of the transmission element extending away from the piston 48a in the radial direction 32a 24a is arranged.
  • the two sections 136a, 138a are aligned parallel to each other and perpendicular to the axial direction 50a of the piston unit 16a.
  • a central portion 140a of the transmission element 24a is oriented substantially perpendicular to the first and the second portions 136a, 138a and extends on a radially outwardly directed wall 80a of the piston
  • the transmission unit 18a has a bearing element 46a, on which the transmission element 24a is movably mounted, wherein the bearing element 46a is at least partially around the Longitudinal axis 106a of the transmission element 24a is rotatably arranged.
  • the bearing member 46a is formed by a hinge unit formed as a ball joint unit 114a.
  • the ball joint unit 114a has an outer joint ring ball 116a, an inner joint ring ball 118a and a slide ring 120a, which is arranged between the outer joint ring ball 116a and the inner joint ring ball 118a (FIG. 5).
  • the sliding ring 120a could also be formed integrally with the outer joint ring ball 116a.
  • the outer joint ring ball 116a of the ball joint unit 114a is formed integrally with the two wobble legs 20a, 22a, wherein the outer joint ring ball 116a is disposed between the two wobble legs 20a, 22a on the swash bearing 36a opposite ends 98a, 100a of the two wobble legs 20a, 22a.
  • the two wobble legs 20a, 22a are bent at the ends 98a, 100a facing away from the wobble bearing 36a, wherein the ends 98a, 100a of the two wobble legs 20a, 22a converge towards one another (FIG. 5).
  • the inner hinge ring ball 118a is fixed to the transmission element 24a by pressing the inner hinge ring ball 118a with the transmission element 24a.
  • Joint ring ball 118a is thereby arranged against rotation on the transmission element 24a, so that a relative movement between the transmission element 24a and the inner joint ring ball 118a is prevented.
  • a relative movement between the transmission element 24a and the ball joint unit 114a takes place during operation of the impact device 10a or of the rotary and / or chisel hammer between the outer joint ring ball 116a and the inner joint ring ball 118a via the sliding ring 120a (FIG. 5).
  • the impact device 10a also has a guide rail 122a (FIGS. 4 and 5).
  • the transmission element 24a is arranged in the guide rail 122a with an end region 124a facing away from the piston 48a.
  • the guide rail 122a is arranged on a housing, not shown, of the drill and / or chisel hammer.
  • the transmission element 24a has a sliding element 126a.
  • the sliding element 126a is cup-shaped and arranged on the end region 124a of the transmission element 24a around the transmission element 24a.
  • the transmission element 24a has a bore 128a extending along its longitudinal extension 112a for a weight reduction.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)

Abstract

La présente invention concerne un dispositif de percussion destiné notamment à un marteau perforateur et/ou à un marteau burineur (12) comprenant une unité de percussion (14; 14a) qui présente une unité à piston (16, 16a); une unité de transmission (18;18a) qui présente au moins une branche de culbuteur (20; 22; 20a; 22a) et qui est conçue pour transmettre un mouvement à l'unité de percussion (14; 14a); et un élément de transmission (24, 24a) situé entre l'unité de transmission (18, 18a) et l'unité à piston (16, 16a). Selon l'invention, l'élément de transmission (24; 24a) présente une direction de transfert de force (26, 26a) comprenant une composante opposée à la direction de transfert de force (28; 30; 30a) de la branche de culbuteur (20; 22; 20a, 22a).
EP09779566.0A 2008-07-28 2009-05-28 Dispositif de percussion Not-in-force EP2307172B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200810040765 DE102008040765A1 (de) 2008-07-28 2008-07-28 Schlagvorrichtung
PCT/EP2009/056510 WO2010012520A1 (fr) 2008-07-28 2009-05-28 Dispositif de percussion

Publications (2)

Publication Number Publication Date
EP2307172A1 true EP2307172A1 (fr) 2011-04-13
EP2307172B1 EP2307172B1 (fr) 2016-12-21

Family

ID=40912038

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09779566.0A Not-in-force EP2307172B1 (fr) 2008-07-28 2009-05-28 Dispositif de percussion

Country Status (5)

Country Link
EP (1) EP2307172B1 (fr)
CN (1) CN102105272B (fr)
DE (1) DE102008040765A1 (fr)
RU (1) RU2011107127A (fr)
WO (1) WO2010012520A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107627263B (zh) * 2017-09-30 2023-11-10 苏州宝时得电动工具有限公司 电锤

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3438208A1 (de) * 1984-10-18 1986-04-24 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Handgefuehrte hammerbohrmaschine mit gegen verdrehen gesichertem antriebsglied
USRE35372E (en) * 1988-06-07 1996-11-05 S-B Power Tool Company Apparatus for driving a drilling or percussion tool
DE4207295A1 (de) * 1992-03-07 1993-09-09 Black & Decker Inc Bohrhammer
DE4441820B4 (de) * 1994-11-24 2004-10-28 Robert Bosch Gmbh Bohr- und/oder Schlaghammer
DE19540391A1 (de) * 1995-10-30 1997-05-07 Hilti Ag Bohr- und Meisselgerät
DE19856638A1 (de) * 1998-12-03 2000-06-08 Black & Decker Inc Antrieb für ein Elektrowerkzeug, insbesondere einen Bohrhammer, sowie Bohrhammer
GB2394437A (en) * 2002-10-23 2004-04-28 Black & Decker Inc Hammer including a piston with wear-reducing washers
CN201009226Y (zh) * 2006-07-28 2008-01-23 苏州宝时得电动工具有限公司 电锤

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2010012520A1 *

Also Published As

Publication number Publication date
CN102105272A (zh) 2011-06-22
DE102008040765A1 (de) 2010-02-04
WO2010012520A1 (fr) 2010-02-04
EP2307172B1 (fr) 2016-12-21
RU2011107127A (ru) 2012-09-10
CN102105272B (zh) 2014-10-29

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