EP1157789A1 - Handwerkzeuggerät mit elektromagnetischem Schlagwerk - Google Patents
Handwerkzeuggerät mit elektromagnetischem Schlagwerk Download PDFInfo
- Publication number
- EP1157789A1 EP1157789A1 EP01810470A EP01810470A EP1157789A1 EP 1157789 A1 EP1157789 A1 EP 1157789A1 EP 01810470 A EP01810470 A EP 01810470A EP 01810470 A EP01810470 A EP 01810470A EP 1157789 A1 EP1157789 A1 EP 1157789A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- hand tool
- coil
- stator
- axis
- assigned
- 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
Links
- 238000009527 percussion Methods 0.000 title description 2
- 230000005291 magnetic effect Effects 0.000 claims abstract description 26
- 230000010355 oscillation Effects 0.000 claims abstract description 22
- 230000004907 flux Effects 0.000 claims abstract description 9
- 230000005294 ferromagnetic effect Effects 0.000 claims description 8
- QNRATNLHPGXHMA-XZHTYLCXSA-N (r)-(6-ethoxyquinolin-4-yl)-[(2s,4s,5r)-5-ethyl-1-azabicyclo[2.2.2]octan-2-yl]methanol;hydrochloride Chemical compound Cl.C([C@H]([C@H](C1)CC)C2)CN1[C@@H]2[C@H](O)C1=CC=NC2=CC=C(OCC)C=C21 QNRATNLHPGXHMA-XZHTYLCXSA-N 0.000 claims description 4
- 230000005415 magnetization Effects 0.000 claims description 2
- 239000000463 material Substances 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 2
- 238000006424 Flood reaction Methods 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000005520 electrodynamics Effects 0.000 description 1
- 230000002996 emotional effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D11/00—Portable percussive tools with electromotor or other motor drive
- B25D11/06—Means for driving the impulse member
- B25D11/064—Means for driving the impulse member using an electromagnetic drive
Definitions
- the invention relates to an at least partially striking hand tool device, for example. a chisel hammer or rotary hammer with an electromagnetic hammer mechanism.
- a flying piston is axially limitedly movable with respect to the tool with a ferromagnetic insert, which is coaxial inside one, one in time changing magnetic field generating, coil is arranged, and which for storing the Kickback energy is axially connected to a storage spring.
- a disadvantage of such Solutions is the poor electrical efficiency of the impact energies that can be achieved. A Increasing this efficiency is only associated with an impermissible reduction lifetime possible.
- an electrodynamic actuator in a magnetic Flux circuit formed which has a permanent magnet, a coil and a soft magnetic, penetrated ferromagnetic armature.
- the yoke, here the anchor and the coil is across two springs arranged on both sides transversely to the adjacent surface areas of the flow passing through the U-shaped stator with limited mobility. So that The spring-mass system that can oscillate can be created by a flow through the coil Alternating current can be excited to forced vibrations.
- a disadvantage of one Such a solution is for use as a striking mechanism in hand tools high mass of the part to be moved as a flying piston and the necessary lifespan power supply of the moving coil of the striking mechanism.
- an oscillating linear drive works according to the principle a "polarized reluctance actuator" (PRA).
- PRA polarized reluctance actuator
- a yoke here the anchor and the magnet
- This Yoke is made by the coil of a U-shaped stator with its control magnetic field between the two pole pieces, the flux density varied transversely to the adjacent flood areas of the river passing through the yoke or through the river in the flooding area resulting field gradients in the direction of a minimum total flow resistance emotional.
- a disadvantage of such a solution is that for use as a striking mechanism in Hand tool devices high impact sensitivity of permanent magnets with regard to their magnetic and mechanical properties.
- the object of the invention is to realize an at least partially striking Hand tool with an electromagnetic hammer mechanism with comparable lifespan increased efficiency of the achievable impact energies.
- a vibrating linear drive corresponding to the Principle of a "polarized reluctance actuator" (PRA) used, in which one, one magnetic flux generating magnet along one of the directions of impact of a tool of the hand tool corresponding oscillating axis is magnetized and along next to a stator located at one end of a longitudinally U-shaped stator, Segment of a coil is arranged, the axis of which is transverse to the oscillation axis.
- PRA polarized reluctance actuator
- the pole piece assigned to the segment of the coil at one end of the stator is over a gap perpendicular to the axis of vibration and the axis of the coil in two pole pieces divided, between which the magnetic coil of the current-carrying coil River can be split.
- a bridging both pole shoes of the stator, along the Swing axis limits movably mounted yoke, which at least in the pole pieces assigned flow area along the oscillation axis made of soft magnetic, ferroelectric material, has a position with respect to both partial pole shoes along the oscillation axis, at which the resulting total magnetic resistance is minimal in the overall flow cycle.
- the current strength of the coil is advantageous in accordance with the condition of cancellation of the selected flux generated by the magnet in a partial pole piece, whereby this doubled in the other pole piece. This is an optimal control behavior of the anchor given by the coil.
- the anchor on the end facing away from the tool is advantageous via a storage spring for storing the rebound energy with the housing of the hand tool connected.
- the resulting energy-storing, self-oscillating system means that Efficiency further increased.
- two opposite segments of the coil are each one, each at the end of the pole shoe formed in the longitudinal section U-shaped stator assigned and this is divided into two partial pole shoes with a gap, the Anchor with respect to the partial pole shoes arranged in one direction, associated flow areas with regard to a minimum magnetic resistance is trained.
- the current flowing through the coil as a result of the Flow division forces acting on the anchor, which are mirror-symmetrical Double training to a plane perpendicular to the swing axis.
- the movable anchor is a common yoke two more rotationally symmetrical to the oscillation axis, another one U-shaped in longitudinal section Assigned stator, a magnetized magnet, partial pole shoes and assigned Containing segments of a current-carrying coil. This adds up to the Forces acting again anchor, which are in a symmetrical training double again.
- composite flying piston In addition to the advantageous considering the high mechanical alternating load one-piece design of the anchor used as a flying piston points with respect to lower mass, consisting of lighter material in the distance area, composite flying piston also has advantages.
- the magnetic flux circuit closes over both of them U-shaped in longitudinal section Stators and the two, axially offset to the oscillation axis, flood areas of the Anchor made yokes.
- the flow areas are perpendicular to the river Floods swinging axis, which maximizes the resulting force on the anchor.
- the anchor designed as a flying piston which is advantageously longitudinal, can also be advantageous of the river passing through it is made flatter, a mirror symmetry have, in which, based on the cross-sectional area, the area of the Flooding areas increase because they are flatter along the river that runs through them is executed.
- the side edges perpendicular to this serve advantageously for storing the Flying piston vertical and as a guide parallel to the swing axis.
- the cross-sectional area of the flat flying piston serve to enclose an acute angle on both sides as the side edge Partial flow areas for storage or guidance on the correspondingly assigned, in Angled, pole pieces of the U-shaped stators in longitudinal section, with the Reduction of friction and wear a thin, lubricious, preferably a non-ferromagnetic intermediate layer forming a magnetic gap on the pole shoes and / or the partial flow areas is applied.
- the end face of the flying piston facing the tool advantageously contains one radial circular area, which is used for low-wear transmission of the field to the Tool or designed for intermediate pistons.
- the end face of the flying piston facing the storage spring also advantageously contains an at least partially radial circular ring surface for at least partially circumferential Contact with the spring.
- An axial blind bore is advantageous for reducing weight intended.
- the end face of the flying piston facing the tool with a die is advantageous Prestressed spring preloaded so that the springs instead of in Alternating load range can be operated in the pressure threshold range and thus their Life can be increased.
- an electromagnetic hammer mechanism 1 is not shown in full Hand tool device 2 with a tool 3, along a parallel to the tool axis Swing axis A is arranged, an axis B of coils 4a, 4b of the striking mechanism 1 is oriented perpendicular to the oscillation axis A and the stator of the striking mechanism 1 the segments the permanent magnets 5a associated with the coils 4a, 4b along the oscillation axis A. includes.
- Fig. 2 shows the electromagnetic striking mechanism 1 in a not fully shown Hand tool device 2 cut in a containing the oscillation axis A and the axis B. Level.
- the magnetic flux-producing, advantageously permanently executed, Magnets 5a, 5b are along a direction corresponding to the direction of impact of the tool 3 Vibration axis A magnetized in opposite directions and alongside one, at one end one, partially surrounding one of opposite segments of the coil 4a, Toroidal core 6a and magnet 5a arranged therebetween, U-shaped stator located, segment of the coil 4a, 4b, whose axis B transverse to the oscillation axis A lies.
- the pole piece assigned to the segment of the coil 4a at one end of the stator is perpendicular to the oscillation axis A and the axis B of the coil 4a in two via a gap 7a Partial pole pieces 8a, 9a divided, between which via a control magnetic field current-carrying segment of the coil 4a the flow can be divided.
- One both Stator bridging pole pieces limited movement along the oscillation axis A.
- the yoke 10 which forms the movable armature of a vibrating linear motor is open the end facing away from the tool 3 via a storage spring 12 for storage the rebound energy with the housing 13 of the hand tool 2 and on the Tool 3 facing end face connected to a biasing spring 14.
- Two, opposite segments of the coil 4a is one, each at the end of the U-shaped Stator trained, associated pole piece and this with a gap 7a in each divides two partial pole shoes 8a, 9a, the yoke 10 forming the armature with respect that assigned to the partial pole shoes 8a and 9a, respectively, arranged in one direction Flooding areas 11 is formed area-wide.
- the distance area 15 of the armature located between the flow areas 11 forming yoke 10 consists of another, non-ferromagnetic, material such as Aluminum or plastic.
- the movable anchor as a common yoke 10 is twofold Another U-shaped stator is assigned rotationally symmetrically to the oscillation axis A, one oppositely magnetized permanent magnets 5b and partial pole shoes 8b, 9b one, an assigned segment of an identically oriented current-carrying coil 4b partially surrounding toroidal core 6b, including.
- the two coils 4a, 4b are each partially around the vibration axis A. curved around, only the ring core 6a lying around a segment of the coil 4a is shown.
- the anchor designed as a flying piston, which forms the yoke 10, has a mirror symmetry flat along the flow passing through it along the axis B. on.
- the side edges 16 advantageously serve to support the flying piston vertically and as Guide parallel to the swing axis A.
- the rhombic side edges 16 are (in only indicated once in the illustration), formed at an angle, pole pieces with two through assigned a gap 7a to separate partial pole pieces 8a, 9a of the U-shaped stators, wherein in between is a thin, slidable, non-ferromagnetic one that forms a magnetic gap Liner 17 is applied to the partial flooding areas.
- the tool facing end face of the flying piston includes a radial circular surface 18 which for low-wear transmission of the impact to the tool or to intermediate pistons is designed.
- the end face of the flying piston facing the storage spring contains around an axial blind bore 19 an at least partially radial annular surface 20 for at least partial, extensive contact with the storage spring.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Reciprocating, Oscillating Or Vibrating Motors (AREA)
- Percussive Tools And Related Accessories (AREA)
Abstract
Description
Claims (12)
- Handwerkzeuggerät zur Erzeugung einer zumindest teilweise schlagenden Bewegung eines Werkzeugs (3) entlang einer Schwingachse (A) mit einem einen Stator aufweisenden elektromagnetischen Schlagwerk (1), mit zumindest einer Spule (4a) und einem als ein Joch (10) im magnetischen Fluss ausgebildeten, begrenzt längs der Schwingachse (A) beweglichen, Flugkolben, welcher zumindest einen weichmagnetischen ferromagnetischen Durchflutungsbereich (11) aufweist, dadurch gekennzeichnet, dass dem Stator des elektromagnetischen Schlagwerks (1) zumindest ein Magnet (5a) längs der Schwingachse (A) magnetisiert zugeordnet sowie längs neben zumindest einem, an einem Ende des Stators befindlichen, Segment der Spule (4a) angeordnet ist, wobei die Spule (4a) eine Achse (B) quer zur Schwingachse (A) aufweist.
- Handwerkzeuggerät nach Anspruch 1, dadurch gekennzeichnet, dass ein an einem Ende des Stators dem Segment der Spule (4a) zugeordnete Polschuh über einen Spalt (7a) quer zur Schwingachse (A) und zur Achse (B) der Spule (4a) in zwei Teilpolschuhe (8a, 9a) unterteilt ist.
- Handwerkzeuggerät nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass zweien, gegenüberliegenden Segmenten der Spule (4a) je ein, jeweils am Ende des Stators ausgebildeter, Polschuh zugeordnet ist, wobei das Joch (10) bezüglich der, den jeweils in einer Richtung angeordneten Teilpolschuhen (8a bzw. 9a) zugeordneten, Durchflutungsbereiche (11) bezüglich eines minimalen magnetischen Widerstands ausgebildet ist.
- Handwerkzeuggerät nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass dem Joch (10) zweizählig rotationssymmetrisch zur Schwingachse (A) ein weiterer Stator zugeordnet ist, einen magnetisierten Magneten (5b), Teilpolschuhe (8b, 9b) und zugeordnete Segmente einer stromdurchflossenen Spule (4b) beinhaltend.
- Handwerkzeuggerät nach Anspruch 4, dadurch gekennzeichnet, dass bezüglich beider Statoren die Magnetisierungsrichtung der Magneten (5a, 5b) entgegengesetzt und die Stromrichtung durch die Spulen (4a, 4b) gleich orientiert ist.
- Handwerkzeuggerät nach Anspruch 5, dadurch gekennzeichnet, dass die Durchflutungsbereiche (11) des Jochs (10) vom resultierenden magnetischen Fluss senkrecht zur Schwingachse (A) durchflutet sind.
- Handwerkzeuggerät nach einem der Ansprüche 4 bis 6, dadurch gekennzeichnet, dass die beiden Spulen (4a, 4b) teilweise um die Schwingungsachse (A) herum gekrümmt sind.
- Handwerkzeuggerät nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass der Flugkolben eine Spiegelsymmetrie aufweist, längs des diesen durchsetzenden Flusses flacher ausgeführte und mit Seitenkanten (15) versehen ist.
- Handwerkzeuggerät nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Polschuhe der Statoren winkelig angeordnet und den Teildurchflutungsflächen des rhombische Querschnittsflächen aufweisenden Flugkolbens zugeordnet sind.
- Handwerkzeuggerät nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass eine dünne, gleitfähige, optional nicht ferromagnetische, Zwischenlage auf den Pohlschuhen und/oder den Teildurchflutungsflächen aufgebracht ist.
- Handwerkzeuggerät nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass der Flugkolben auf der dem Werkzeug (3) abgewandten Stirnseite über eine Speicherfeder (12) zur Speicherung der Rückprallenergie mit einem Gehäuse (13) des Handwerkzeuggerätes (2) verbunden ist.
- Handwerkzeuggerät nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die dem Werkzeug (3) zugewandte Stirnfläche des Flugkolbens mit einer die Speicherfeder (12) vorspannenden Vorspannfeder (14) vorgespannt ist.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10025371A DE10025371A1 (de) | 2000-05-23 | 2000-05-23 | Handwerkzeuggerät mit elektromagnetischem Schlagwerk |
| DE10025371 | 2000-05-23 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1157789A1 true EP1157789A1 (de) | 2001-11-28 |
| EP1157789B1 EP1157789B1 (de) | 2007-08-08 |
Family
ID=7643156
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP01810470A Expired - Lifetime EP1157789B1 (de) | 2000-05-23 | 2001-05-14 | Handwerkzeuggerät mit elektromagnetischem Schlagwerk |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US6520269B2 (de) |
| EP (1) | EP1157789B1 (de) |
| JP (1) | JP2002011676A (de) |
| CN (1) | CN1324712A (de) |
| DE (2) | DE10025371A1 (de) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2210711A1 (de) * | 2009-01-21 | 2010-07-28 | HILTI Aktiengesellschaft | Schlagwerk und Handwerkzeugmaschine |
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| US5497555A (en) * | 1994-12-19 | 1996-03-12 | Averbukh; Moshe | Electromagnetic percussion device |
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- 2000-05-23 DE DE10025371A patent/DE10025371A1/de not_active Withdrawn
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- 2001-05-14 DE DE50112812T patent/DE50112812D1/de not_active Expired - Lifetime
- 2001-05-14 US US09/855,072 patent/US6520269B2/en not_active Expired - Lifetime
- 2001-05-15 CN CN01119004.3A patent/CN1324712A/zh active Pending
- 2001-05-23 JP JP2001154143A patent/JP2002011676A/ja active Pending
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|---|---|---|---|---|
| DE2821842A1 (de) * | 1978-05-19 | 1979-11-29 | Doege Eckart | Elektromagnetische antriebsvorrichtung |
| US5497555A (en) * | 1994-12-19 | 1996-03-12 | Averbukh; Moshe | Electromagnetic percussion device |
| DE19855750A1 (de) * | 1998-12-03 | 2000-06-08 | Hilti Ag | Handgeführtes Bohr- und/oder Meisselgerät |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2210711A1 (de) * | 2009-01-21 | 2010-07-28 | HILTI Aktiengesellschaft | Schlagwerk und Handwerkzeugmaschine |
| US9259830B2 (en) | 2009-01-21 | 2016-02-16 | Hilti Aktiengesellschaft | Striking mechanism and hand-held power tool |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2002011676A (ja) | 2002-01-15 |
| EP1157789B1 (de) | 2007-08-08 |
| DE10025371A1 (de) | 2001-11-29 |
| US6520269B2 (en) | 2003-02-18 |
| US20020014344A1 (en) | 2002-02-07 |
| DE50112812D1 (de) | 2007-09-20 |
| CN1324712A (zh) | 2001-12-05 |
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