EP1301726A1 - Embrayage a une seule surface de friction exempt de bague glissante et a commande electromagnetique - Google Patents

Embrayage a une seule surface de friction exempt de bague glissante et a commande electromagnetique

Info

Publication number
EP1301726A1
EP1301726A1 EP01957967A EP01957967A EP1301726A1 EP 1301726 A1 EP1301726 A1 EP 1301726A1 EP 01957967 A EP01957967 A EP 01957967A EP 01957967 A EP01957967 A EP 01957967A EP 1301726 A1 EP1301726 A1 EP 1301726A1
Authority
EP
European Patent Office
Prior art keywords
armature
rotor
axially
friction clutch
rotor element
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.)
Withdrawn
Application number
EP01957967A
Other languages
German (de)
English (en)
Inventor
Rudolf Schneider
Helmut Fronius
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.)
ZF Friedrichshafen AG
Original Assignee
ZF Friedrichshafen AG
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
Priority claimed from DE2000135277 external-priority patent/DE10035277A1/de
Priority claimed from DE2000135276 external-priority patent/DE10035276A1/de
Application filed by ZF Friedrichshafen AG filed Critical ZF Friedrichshafen AG
Publication of EP1301726A1 publication Critical patent/EP1301726A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D27/00—Magnetically- or electrically- actuated clutches; Control or electric circuits therefor
    • F16D27/10—Magnetically- or electrically- actuated clutches; Control or electric circuits therefor with an electromagnet not rotating with a clutching member, i.e. without collecting rings
    • F16D27/108—Magnetically- or electrically- actuated clutches; Control or electric circuits therefor with an electromagnet not rotating with a clutching member, i.e. without collecting rings with axially movable clutching members
    • F16D27/112—Magnetically- or electrically- actuated clutches; Control or electric circuits therefor with an electromagnet not rotating with a clutching member, i.e. without collecting rings with axially movable clutching members with flat friction surfaces, e.g. discs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D27/00—Magnetically- or electrically- actuated clutches; Control or electric circuits therefor
    • F16D2027/008—Details relating to the magnetic circuit, or to the shape of the clutch parts to achieve a certain magnetic path

Definitions

  • the invention relates to an electromagnetically actuated, slip ring-free single-face friction clutch with a cup-shaped anchor element.
  • An electromagnetically actuated friction clutch with such an anchor element is shown in the unpublished DE 199 51 630.
  • This coupling has a rotatably mounted rotor element, a fixed magnetic body with a magnet coil and a rotatable, but axially displaceably mounted, pot-like anchor element.
  • the anchor element has an annular disk-shaped area and a cylindrical jacket-shaped area.
  • the armature element dips into an annular groove of the magnet body with a cylinder-shaped region, it being possible for magnetic flux to be transmitted via a narrow, radial air gap.
  • This type of electromagnetically actuated clutches is inexpensive to manufacture, requires little space and is highly reliable.
  • Such a coupling is suitable for hand-held impact drills for selectively coupling or uncoupling the drive motor from the output side
  • the coupling responds to high loads and / or deflection movements of the housing of the impact drill, such as occur when the drilling tool gets caught. This can avoid a risk of injury to the machine operator.
  • the coupling described in DE 199 51 630 is intended to be installed in an impact drill in such a way that the rotor element is constantly driven by the drive motor and the armature element. ment is constantly connected to the drilling tool or the drilling tool holder.
  • the invention is therefore based on the object of reducing the undesirable reaction moments which can still occur after the clutch has been released to a minimum.
  • the clutch should also be able to be further developed in such a way that the time until the drive side comes to a standstill after a triggering process.
  • the rotor element is on the output side and the armature element is on the drive side. arranged on the side. Due to the shape of the pot, the anchor element on its cylindrical surface at a large distance from the center of rotation has considerable portions of its total mass and therefore has a large moment of inertia. In contrast, the rotor element has a smaller diameter and lower mass fractions that are far from the center of rotation. It therefore has a much smaller mass moment of inertia, which means that the angular momentum that has to be reduced on the output side after the clutch is released is much smaller. Tear out of a hand-held tool after the clutch has been released is reduced to a minimum.
  • the friction surface of the rotor element is assigned to the side of the annular disk-shaped region of the armature element, which lies opposite the region of the armature element in the form of a cylinder jacket.
  • the friction surface of the rotor element lies, so to speak, outside the cup-shaped armature on the pot bottom, the rotor element lying essentially outside the axial installation space occupied by the armature element.
  • the rotor element is therefore very close to the output side, which enables a short, output-side shaft with a correspondingly small moment of inertia.
  • the anchor element can be axially displaced between two end positions, it being in the the first end position is frictionally coupled to the rotor element and in the second end position is frictionally connected to a stationary brake ring.
  • This embodiment can advantageously be developed in that the armature element is connected or connectable to an armature shaft by means of an axially deflectable spring element, the armature element being biased axially against the brake ring by the spring element.
  • this brake which is formed by simple means, is actuated by the biasing force of the spring element.
  • ⁇ sondere in combination with an embodiment in which the friction surface of the rotor element is assigned to the side of the ringschei- benförmigen portion of the anchor element which faces the cylinder jacket-shaped portion of the anchor element, is provided with extremely simple means, a clutch-brake combination.
  • the anchor element then has a friction surface at both axial ends.
  • a friction surface is arranged on the ring disk-shaped area of the armature, so to speak on the bottom of the pot, opposite the rotor element and a friction surface on the end face of the cylinder jacket-shaped area opposite the brake ring.
  • the friction surfaces of the rotor element and the brake ring form axial stops, between which the armature element can be moved back and forth.
  • a space-saving design of the coupling is characterized in that a flange is provided on the armature shaft for connection to the spring element, which carries the armature element, which conducts a magnetic flux between the magnet body and the rotor element in the case of a current-carrying magnet coil. If a first part of the flange extends axially along an inner circumferential surface of the magnet body with a narrow radial air gap and a second part of the flange comprises a hub of the rotor element with a narrow radial air gap, the magnetic flux can in each case with little over the narrow radial air gaps
  • the flange In addition to the function of mechanically coupling the armature element to the drive-side armature shaft, the flange also fulfills the function of magnetically coupling the rotor element to the magnet body.
  • the electromagnetically actuated coupling according to the invention and its embodiments are suitable due to their low output moment of inertia, their compact design and their low manufacturing costs for the optional coupling or decoupling of a drive motor and a drilling or percussion drilling tool in a hand-held drilling or percussion drilling machine.
  • 2 denotes a rotor element arranged on a rotor shaft 4.
  • the rotor shaft 4 is rotatably supported by means of bearings, not shown.
  • a fixed magnetic body 6 is provided with a magnetic coil 8, which is arranged between an inner lateral surface 10 and an outer lateral surface 12 of the magnetic body.
  • the magnetic body 6 is arranged fixed in the housing 14 of the clutch, so that the power supply to the magnetic coil 8 takes place without a slip ring.
  • a ball bearing 16 is NEN retaining ring 18 is held, which sits on a drive-side armature shaft 20.
  • a flange 22 sits on the armature shaft 20 in a rotationally fixed manner, to which an axially resilient but torsionally rigid spring element 26 is fastened by means of fastening screws 24.
  • a possible embodiment of the spring element is described in the aforementioned DE 199 51 630. It is stated that the content of this earlier application is included in the disclosure content of the present application.
  • the spring element 26 carries the anchor element 28, which is thus connected to the flange 22 in a torsionally rigid manner, but is axially deflectable relative to the flange.
  • the anchor element 28 is cup-shaped with an annular disk-shaped area 28A and a cylindrical jacket-shaped area 28B. There is a narrow radial air gap between the cylindrical jacket-shaped region 28B of the armature element and the outer jacket surface 12 of the magnet body 6, via which a magnetic flux can be transmitted from the armature element to the magnet body or vice versa.
  • a bridgeable, axial working air gap S is located between the annular-disk-shaped area 28A of the armature element and an axially opposite, annular-disk-shaped friction surface 30 of the rotor element 2 magnetic poles that create an attractive force. Due to the attractive force, the armature element 28 is deflected axially in the direction of the rotor element, so that the working air gap S is bridged and the two elements are connected to one another in a friction-locked manner.
  • the clutch takes up this switching position in a hand-held drill or impact drill during operation. A drilling or impact drilling tool is then driven by a drive motor.
  • the tool on the output side is decoupled from the drive motor by switching off the magnet coil 8.
  • the anchor element 28 is separated from the rotor element by a prestressing force of the spring element 26.
  • the output side of the clutch which is formed by the rotor element 2 and the rotor shaft 4, has only a very low mass moment of inertia, as a result of which a further deflection movement after the clutch is released is reduced to a minimum.
  • the friction surface 30 of the rotor element 2 shown in FIG. 1 is assigned to the side of the annular disk-shaped area 28A of the armature element 28, which lies opposite the cylinder jacket-shaped area 28B of the armature element 28.
  • the axial movement of the armature element 28 is limited on the one hand by the rotor element 2 and on the other hand by a brake ring 32.
  • the anchor element 28 is axially displaceable between two end positions, in the first, left end position it is frictionally coupled to the rotor element 2 and in the second, right end position it is in frictional engagement with the fixed brake ring 32.
  • the spring element 26 exerts an axial prestressing force on the armature element 28, by means of which the armature element is pressed axially against the brake ring.
  • the armature shaft 20 with the armature element 28 and the drive motor connected to it braked to a standstill in a short time. This means that the machine operator only has a very short waiting time before the machine is ready for operation again after a triggering process.
  • the flange 22 which establishes the drive connection between the armature shaft 20 and the spring element 26 or the armature element 28, extends with a narrow radial air gap along part of the inner circumferential surface 10 of the magnet body 6. A magnetic flux from the magnet body is generated via the narrow radial air gap transferred to the flange. In a second region of the flange, a hub 34 of the rotor element 2 with a narrow radial air gap is encompassed.
  • a magnetic flux which is represented by the line 36 and which occurs when the magnet coil 8 flows through current, thus flows from the radially inner circumferential surface 10 of the magnet body 6 via an air gap to the flange 22, from there via a narrow radial air gap to the hub 34 of the Rotor element, from there via the bridged working air gap S to the cup-shaped armature element 28 and from there via a narrow radial air gap to the outer lateral surface 12 of the magnet body 6.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Mechanical Engineering (AREA)
  • Braking Arrangements (AREA)

Abstract

Embrayage à une seule surface de friction exempt de bague glissante et à commande électromagnétique, qui comporte un élément rotor (2), un corps magnétique fixe (6) et un élément induit (28) à coulissement axial en forme de pot. Une zone cylindrique (28b) de l'élément induit (28) s'étend avec un entrefer radial étroit sur une surface externe (12) de paroi du corps magnétique (6). Un entrefer de travail (S) pouvant être ponté se trouve entre l'élément induit (28) et une surface de friction (30) de l'élément rotor. Selon la présente invention, pour maintenir au minimum possible le couple d'inertie côté sortie, l'élément rotor (2) est placé côté sortie et l'élément induit (28) est placé côté commande.
EP01957967A 2000-07-20 2001-07-14 Embrayage a une seule surface de friction exempt de bague glissante et a commande electromagnetique Withdrawn EP1301726A1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE10035276 2000-07-20
DE10035277 2000-07-20
DE2000135277 DE10035277A1 (de) 2000-07-20 2000-07-20 Elektromagnetisch betätigbare, schleifringlose Einflächen-Reibungskupplungs-Bremskombination
DE2000135276 DE10035276A1 (de) 2000-07-20 2000-07-20 Elektromagnetisch betätigbare, schleifringlose Einflächen-Reibungskupplung
PCT/EP2001/008141 WO2002008627A1 (fr) 2000-07-20 2001-07-14 Embrayage a une seule surface de friction exempt de bague glissante et a commande electromagnetique

Publications (1)

Publication Number Publication Date
EP1301726A1 true EP1301726A1 (fr) 2003-04-16

Family

ID=26006452

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01957967A Withdrawn EP1301726A1 (fr) 2000-07-20 2001-07-14 Embrayage a une seule surface de friction exempt de bague glissante et a commande electromagnetique

Country Status (3)

Country Link
US (1) US6827189B2 (fr)
EP (1) EP1301726A1 (fr)
WO (1) WO2002008627A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020061848A1 (en) * 2000-07-20 2002-05-23 Ajay Bhatia Compounds and methods for treatment and diagnosis of chlamydial infection
US7975818B2 (en) * 2005-06-10 2011-07-12 Warner Electric Technology Llc Rotational coupling device
US7732959B2 (en) * 2005-06-10 2010-06-08 Warner Electric Technology, Llc Rotational coupling device
US7493996B2 (en) * 2005-06-10 2009-02-24 Warner Electric Technology Llc Rotational coupling device
US20070209896A1 (en) * 2006-03-10 2007-09-13 Pardee James A Rotational coupling device
US7527134B2 (en) 2006-04-03 2009-05-05 Warner Electric Technology Llc Rotational coupling device
CN102529933B (zh) * 2012-01-11 2014-12-17 龙口中宇机械有限公司 制动气泵及其制造方法和控制方法
US9874254B2 (en) * 2016-01-29 2018-01-23 Warner Electric Technology Llc Electromagnetic brake for a power transmission assembly

Family Cites Families (17)

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Publication number Priority date Publication date Assignee Title
US2490044A (en) * 1947-02-14 1949-12-06 Sperry Corp Magnetic clutch
US3036679A (en) 1958-01-17 1962-05-29 Novi Equipment Co Magnetic clutch structure
US3415347A (en) 1967-01-26 1968-12-10 Stearns Electric Corp Pole structure for electromagnetic clutch or brake with stationary magnet and method of manufacture thereof
FR1558574A (fr) * 1968-01-16 1969-02-28
DE1913883A1 (de) * 1969-03-19 1970-10-08 Siemens Ag Elektromagnetische Bremse oder Kupplung
US3994379A (en) * 1975-06-16 1976-11-30 Facet Enterprises, Inc. Motor Components Division Self-adjusting electromagnetic clutch
US4126215A (en) * 1976-12-20 1978-11-21 Facet Enterprises, Inc. Sealed electromagnetic torque translating device
US4285421A (en) 1979-11-13 1981-08-25 General Motors Corporation Electromagnetic clutch
JPH0663545B2 (ja) 1985-07-05 1994-08-22 神鋼電機株式会社 電磁連結装置
DE3540964A1 (de) 1985-11-19 1987-05-21 Bosch Gmbh Robert Motorisch angetriebenes handwerkzeug fuer bohrenden oder schlagbohrenden betrieb
DE3823387C2 (de) 1988-07-09 2000-11-02 Mannesmann Sachs Ag Anordnung zur Steuerung einer automatisch betätigten Reibungskupplung
FR2648886B1 (fr) 1989-06-27 1991-09-27 Valeo Poulie d'entrainement d'au moins un accessoire, notamment pour vehicule automobile, et nez d'accessoire associe a une telle poulie
US5285882A (en) 1992-12-23 1994-02-15 Dana Corporation Clutch with spacer for supporting a bearing
JP3419121B2 (ja) 1994-11-25 2003-06-23 神鋼電機株式会社 ブレーキ付電磁クラッチ
DE29907942U1 (de) 1999-05-05 1999-07-29 Zf Friedrichshafen Ag, 88046 Friedrichshafen Elektromagnetisch betätigte Einflächenkupplung oder Einflächenbremse
DE19951630B4 (de) 1999-10-26 2004-07-01 Zf Friedrichshafen Ag Elektromagnetisch betätigbare, schleifringlose Einflächen-Reibungskupplung
DE10057139A1 (de) * 2000-11-17 2002-05-23 Hilti Ag Elektrohandwerkzeug mit Sicherheitskupplung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0208627A1 *

Also Published As

Publication number Publication date
US20040104095A1 (en) 2004-06-03
US6827189B2 (en) 2004-12-07
WO2002008627A1 (fr) 2002-01-31

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