WO2008037569A1 - Electric drive unit having a device for maintaining the position of a shaft - Google Patents

Electric drive unit having a device for maintaining the position of a shaft Download PDF

Info

Publication number
WO2008037569A1
WO2008037569A1 PCT/EP2007/059233 EP2007059233W WO2008037569A1 WO 2008037569 A1 WO2008037569 A1 WO 2008037569A1 EP 2007059233 W EP2007059233 W EP 2007059233W WO 2008037569 A1 WO2008037569 A1 WO 2008037569A1
Authority
WO
WIPO (PCT)
Prior art keywords
drive unit
shaft
unit according
holding device
clamping
Prior art date
Application number
PCT/EP2007/059233
Other languages
German (de)
French (fr)
Inventor
Ulrich Grau
Harald Hochmuth
Robby Lipfert
Original Assignee
Schaeffler Kg
Ina Drives & Mechatronics Gmbh & Co. Ohg
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 Schaeffler Kg, Ina Drives & Mechatronics Gmbh & Co. Ohg filed Critical Schaeffler Kg
Publication of WO2008037569A1 publication Critical patent/WO2008037569A1/en

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
    • F16D41/00—Freewheels or freewheel clutches
    • F16D41/06—Freewheels or freewheel clutches with intermediate wedging coupling members between an inner and an outer surface
    • F16D41/08—Freewheels or freewheel clutches with intermediate wedging coupling members between an inner and an outer surface with provision for altering the freewheeling action
    • F16D41/084—Freewheels or freewheel clutches with intermediate wedging coupling members between an inner and an outer surface with provision for altering the freewheeling action the intermediate coupling members wedging by pivoting or rocking
    • 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
    • F16D2121/00—Type of actuator operation force
    • F16D2121/18—Electric or magnetic
    • F16D2121/20—Electric or magnetic using electromagnets
    • F16D2121/22—Electric or magnetic using electromagnets for releasing a normally applied brake
    • 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
    • F16D2125/00—Components of actuators
    • F16D2125/18—Mechanical mechanisms
    • F16D2125/20—Mechanical mechanisms converting rotation to linear movement or vice versa
    • F16D2125/34—Mechanical mechanisms converting rotation to linear movement or vice versa acting in the direction of the axis of rotation
    • F16D2125/36—Helical cams, Ball-rotating ramps

Definitions

  • Electric drive unit with device for maintaining the position of a shaft
  • the invention relates to an electric drive unit with a device for maintaining the position of a rotatably mounted shaft.
  • a generic drive unit is known for example from DE 103 44 211 A1.
  • a position around a shaft namely an armature shaft of an electric motor, a arranged around the shaft wrapping body is used.
  • an actively actuable actuator for example an electrically actuated lifting magnet, is provided.
  • the shaft or the wrapping body may be coated with a material having a high coefficient of friction, in particular with a rubber-like sheathing. The sheathing is inherently subject to wear.
  • the invention has for its object to provide an electric drive unit, which comprises a device for maintaining the position of a shaft and is characterized both by compact design and by a particularly low wear. Summary of the invention
  • This object is achieved according to the invention by an electric drive unit having the features of claim 1.
  • This drive unit comprises both an electric motor with a housing, a stator, a rotor and a shaft connected to the rotor, and a position holding device acting on the shaft, i. a device with which the shaft can be selectively blocked or released.
  • a position holding device is a switchable, double-acting, i. provided in both directions of rotation, provided in the housing of the electric motor clamping roller freewheel.
  • a particularly compact construction of the entire drive unit including the position holding device can be realized.
  • the position holding device is preferably magnetically switchable, wherein a solenoid is provided for their actuation, which is an integral part of the stator of the electric motor.
  • the position holding device is preferably designed such that it is blocking in the de-energized state, i. the shaft of the electric motor is automatically held in case of failure of the power supply.
  • the position holding device may also be designed such that the rotation of the shaft is released in the de-energized state.
  • the outer clamping track of the clamping roller freewheel is formed integrally with an end wall of the housing.
  • the housing which terminates the housing on the front side and provides an external clamping track for the clamping rollers, is suitable for forming an outer raceway of a roller bearing, in particular a ball bearing, of the electric motor.
  • the pinch rollers of the positi- Onshaltevoriques here are arranged axially between the rotor of the electric motor and the bearing of the shaft of the electric motor bearings.
  • the sprag freewheel has a clamping cage leading to a number of pinch rollers, which in the released position of the position holding device, i. when the shaft is not blocked, with the shaft rotated and fixed in the locked position of the position holding device relative to the housing.
  • Double clamping ramps cooperating with the clamping rollers are preferably formed on the surface of the shaft. In the released position of the position holding device, the clamping rollers are located in the middle in a double clamping ramp, with the smallest possible distance to the axis of rotation of the electric motor.
  • the pinch rollers are acted upon by spring force, preferably in the form of a ring spring placed around the cage.
  • spring force preferably in the form of a ring spring placed around the cage.
  • the annular spring is inserted into annular grooves, which are located on the surface of the individual pinch rollers. The spring force of the annular spring is sufficient to prevent lifting of the pinch rollers from the shaft at all speeds occurring.
  • an armature plate which surrounds the shaft in an annular manner and is provided with an axially displaceable armature is preferably provided. This preferably acts positively, in particular by means of a toothing, with the clamping cage together.
  • a spring is tensioned between the armature plate and a non-rotating part of the electric motor, which is preferably designed in a space-saving manner as coaxial with the shaft arranged coil spring.
  • the armature plate is preferably axially displaceable by energizing the stator of the electric motor.
  • FIG. 1 is a perspective, partially sectioned view of an electric drive unit with a device for maintaining the position of a shaft
  • FIG. 2 shows the position holding device of the drive unit according to FIG.
  • Figure 3 shows the position holding device of Figure 2 in an exploded view.
  • An electric drive unit 1 illustrated in FIG. 1 is essentially composed of an electric motor 2 and a position-holding device 3, which is suitable for selectively blocking or releasing a shaft 5 rigidly connected to a rotor 4 of the electric motor 2.
  • the position holding device 3 is formed as a switchable, double-acting clamping roller freewheel and is located as well as the rotor 4 and a cooperating with this stator 6 in a housing 7 of the electric motor 2.
  • the housing 7 is composed of a substantially cylindrical shell part 8 and two end parts 9, 10 which are screwed on the casing part 8, for example.
  • the rotor 4 and the shaft 5 are mounted in the housing 7 by means of two rolling bearings 11, 12, namely ball bearings.
  • the individual balls 13 of the rolling bearing 12 contact on the one hand the shaft 5 and on the other hand, the front part 10, which closes the housing 7 on the side of the position holding device 3.
  • the front part 10 has an inward, ie. towards the rotor 4, pointing annular shoulder 14 integrally formed.
  • This paragraph 14 forms an outer clamping track 15 for pinch rollers 16 of the clamping roller freewheel 3.
  • the pinch rollers 16 are guided in a clamping cage 17 and surrounded by a designed as an annular spring spring 18 which rests in each case a circumferential groove 19 of the individual clamping rollers 16.
  • the annular spring 18 loads the clamping rollers 16 with a force radially inwardly, wherein each pinch roller 16 is located centrally in a double clamping ramp 20 formed on the surface of the shaft 5.
  • the spring 18 serves to keep not only the individual pinch rollers 16, but also the entire clamping cage 17 in freewheeling position.
  • at least one separate spring may be provided in a manner not shown in order to keep the clamping cage 17 in rest or freewheeling position. In any case, when the position holding device 3 is released, the clamping cage 17 rotates with the shaft 5, wherein the clamping rollers 16 do not contact the outer clamping track 15.
  • the armature plate 21 has an outer, in the arrangement of Figure 2 on the end portion 10 adjacent radial portion 22, a paragraph 14 adjacent to this parallel axial portion 23, and an inner radial portion 24 which is adjacent to the pinch rollers 16 axially.
  • a toothing 25 is formed, which is provided for positive engagement with a toothing 26 of the clamping cage 17.
  • the clamping cage 17 has relative to the anchor plate 21 a defined game in the circumferential direction.
  • the anchor plate 21 is secured against rotation by a guide (not visible in FIG. 2). If the anchor plate 21 is in the position shown in FIG.
  • the clamping cage 17 is first rotated along with it as long as the shaft 5 rotates until the toothing 26 is rotated of the clamping cage 17 abuts the toothing 25 of the anchor plate 21.
  • the pinch rollers 16 leave the center position of the double clamping ramps 20, so that the pinch rollers 16 are displaced radially outwards in the direction of the outer clamping track 15, until finally the desired clamping effect occurs and thus the shaft 5 is blocked relative to the housing 7 .
  • a direct form-fitting blocking for example by means of a blocking element engaging in a contour of a shaft, the shaft 5 is thus stopped by the clamping roller freewheel 3, although not abruptly within a small angular range. Excessive loads or damage to the position holding device 3 are thus avoided.
  • the armature plate 21 is permanently loaded by means of a helical spring 27 coaxially surrounding the shaft 5 with a force in the direction of the blocking position shown in FIG.
  • the axially displaceable armature plate 21 forms together with the stator 6 an electromagnetic actuator, wherein the stator 6 acts as a solenoid 28.
  • the stator 6 acts as a solenoid 28.

Abstract

An electric drive unit, into which a device for maintaining the position of a shaft is integrated, comprises an electric motor (2) having a rotor (4), a stator (6), and a housing (7), a shaft (5) that is connected to the rotor (4), and a device (3) for maintaining the position that acts upon the shaft (5), the device being configured as a switchable, double-acting clamping roller freewheel that is integrated in the housing (7).

Description

Bezeichnung der Erfindung Name of the invention
Elektrische Antriebseinheit mit Vorrichtung zur Positionseinhaltung einer WelleElectric drive unit with device for maintaining the position of a shaft
Beschreibungdescription
Gebiet der ErfindungField of the invention
Die Erfindung betrifft eine elektrische Antriebseinheit mit einer Vorrichtung zur Positionseinhaltung einer drehbar gelagerten Welle.The invention relates to an electric drive unit with a device for maintaining the position of a rotatably mounted shaft.
Hintergrund der ErfindungBackground of the invention
Eine gattungsgemäße Antriebseinheit ist beispielsweise aus der DE 103 44 211 A1 bekannt. Hierbei wird zur Positionseinhaltung einer Welle, nämlich einer Ankerwelle eines Elektromotors, ein um die Welle angeordneter Umschlin- gungskörper verwendet. Zur Ausbildung eines Reibschlusses zwischen dem Umschlingungskörper und der Welle ist ein aktiv betätigbares Stellglied, beispielsweise ein elektrisch betätigbarer Hubmagnet, vorgesehen. Um die zum Blockieren der Welle aufzuwendende Haltekraft zu reduzieren, kann die Welle oder der Umschlingungskörper mit einem Werkstoff mit hohem Reibwert, insbesondere mit einer gummiartigen Ummantelung, überzogen sein. Die Ummante- lung ist prinzipbedingt einem Verschleiß ausgesetzt.A generic drive unit is known for example from DE 103 44 211 A1. In this case, a position around a shaft, namely an armature shaft of an electric motor, a arranged around the shaft wrapping body is used. To form a frictional connection between the wrapping body and the shaft, an actively actuable actuator, for example an electrically actuated lifting magnet, is provided. In order to reduce the holding force to be used for blocking the shaft, the shaft or the wrapping body may be coated with a material having a high coefficient of friction, in particular with a rubber-like sheathing. The sheathing is inherently subject to wear.
Aufgabe der ErfindungObject of the invention
Der Erfindung liegt die Aufgabe zugrunde, eine elektrische Antriebseinheit anzugeben, welche eine Vorrichtung zur Positionseinhaltung einer Welle umfasst und sich sowohl durch kompakten Aufbau als auch durch einen besonders geringen Verschleiß auszeichnet. Zusammenfassung der ErfindungThe invention has for its object to provide an electric drive unit, which comprises a device for maintaining the position of a shaft and is characterized both by compact design and by a particularly low wear. Summary of the invention
Diese Aufgabe wird erfindungsgemäß gelöst durch eine elektrische Antriebseinheit mit den Merkmalen des Anspruchs 1. Diese Antriebseinheit umfasst sowohl einen Elektromotor mit einem Gehäuse, einem Stator, einem Rotor und einer mit dem Rotor verbundenen Welle, als auch eine auf die Welle wirkende Positionshaltevorrichtung, d.h. eine Vorrichtung, mit der die Welle wahlweise blockiert oder freigegeben werden kann. Als Positionshaltevorrichtung ist ein schaltbarer, doppelt wirkender, d.h. in beide Drehrichtungen wirkender, in das Gehäuse des Elektromotors integrierter Klemmrollenfreilauf vorgesehen. Dadurch, dass die Achse des Klemmrollenfreilaufs mit der Achse des Elektromotors übereinstimmt und die Klemmrollen des Freilaufs direkt mit der Welle des Elektromotors zusammenwirken, ist ein besonders kompakter Aufbau der gesamten Antriebseinheit einschließlich der Positionshaltevorrichtung realisierbar.This object is achieved according to the invention by an electric drive unit having the features of claim 1. This drive unit comprises both an electric motor with a housing, a stator, a rotor and a shaft connected to the rotor, and a position holding device acting on the shaft, i. a device with which the shaft can be selectively blocked or released. As a position holding device is a switchable, double-acting, i. provided in both directions of rotation, provided in the housing of the electric motor clamping roller freewheel. Characterized in that the axis of the clamping roller freewheel coincides with the axis of the electric motor and the pinch rollers of the freewheel interact directly with the shaft of the electric motor, a particularly compact construction of the entire drive unit including the position holding device can be realized.
Die Positionshaltevorrichtung ist vorzugsweise magnetisch schaltbar, wobei zu deren Betätigung ein Hubmagnet vorgesehen ist, der integraler Bestandteil des Stators des Elektromotors ist. Im Sinne einer bei Ausfall sicheren Funktion ist die Positionshaltevorrichtung bevorzugt derart ausgebildet, dass sie im stromlosen Zustand blockierend ist, d.h. die Welle des Elektromotors bei Ausfall dessen Stromversorgung selbsttätig festgehalten wird. Alternativ kann die Positionshaltevorrichtung auch derart ausgelegt sein, dass die Rotation der Welle im stromlosen Zustand freigegeben ist.The position holding device is preferably magnetically switchable, wherein a solenoid is provided for their actuation, which is an integral part of the stator of the electric motor. In the sense of a fail safe function, the position holding device is preferably designed such that it is blocking in the de-energized state, i. the shaft of the electric motor is automatically held in case of failure of the power supply. Alternatively, the position holding device may also be designed such that the rotation of the shaft is released in the de-energized state.
In einer besonders rationell herstellbaren und zugleich mechanisch stabilen Ausführungsform ist die Außenklemmbahn des Klemmrollenfreilaufs einstückig mit einer Stirnwand des Gehäuses ausgebildet. Zusätzlich ist das das Gehäuse stirnseitig abschließende sowie eine Außenklemmbahn für die Klemmrollen bereitstellende Bauteil geeignet, eine Außenlaufbahn eines Wälzlagers, insbesondere Kugellagers, des Elektromotors zu bilden. Die Klemmrollen der Positi- onshaltevorrichtung sind hierbei axial zwischen dem Rotor des Elektromotors und dem die Welle des Elektromotors lagernden Wälzlager angeordnet.In a particularly rationally producible and at the same time mechanically stable embodiment, the outer clamping track of the clamping roller freewheel is formed integrally with an end wall of the housing. In addition, the housing, which terminates the housing on the front side and provides an external clamping track for the clamping rollers, is suitable for forming an outer raceway of a roller bearing, in particular a ball bearing, of the electric motor. The pinch rollers of the positi- Onshaltevorrichtung here are arranged axially between the rotor of the electric motor and the bearing of the shaft of the electric motor bearings.
In bevorzugter Ausgestaltung weist der Klemmkörperfreilauf einen eine Anzahl Klemmrollen führenden Klemmkäfig auf, welcher in freigegebener Stellung der Positionshaltevorrichtung, d.h. bei nicht blockierter Welle, mit der Welle rotiert und in blockierter Stellung der Positionshaltevorrichtung relativ zum Gehäuse fixiert ist. Mit den Klemmrollen zusammenwirkende Doppelklemmrampen sind vorzugsweise an der Oberfläche der Welle ausgebildet. In freigegebener Stel- lung der Positionshaltevorrichtung befinden sich die Klemmrollen jeweils mittig in einer Doppelklemmrampe, mit kleinstmöglichem Abstand zur Rotationsachse des Elektromotors. Um die Klemmrollen zuverlässig in dieser Lage zu halten, solange die Positionshaltevorrichtung freigegeben ist, sind die Klemmrollen mit Federkraft beaufschlagbar, vorzugsweise in Form einer um den Käfig gelegten Ringfeder. In Platz sparender, die Funktion des Klemmrollenfreilaufs nicht beeinträchtigender Weise ist die Ringfeder in Ringnuten eingelegt, welche sich an der Oberfläche der einzelnen Klemmrollen befinden. Die Federkraft der Ringfeder ist ausreichend, um ein Abheben der Klemmrollen von der Welle bei allen auftretenden Drehzahlen zu verhindern. Somit ist in Freilaufstellung der Positi- onshaltevorrichtung stets ein praktisch reibungsfreier Betrieb des Klemmrollenfreilaufs gegeben.In a preferred embodiment, the sprag freewheel has a clamping cage leading to a number of pinch rollers, which in the released position of the position holding device, i. when the shaft is not blocked, with the shaft rotated and fixed in the locked position of the position holding device relative to the housing. Double clamping ramps cooperating with the clamping rollers are preferably formed on the surface of the shaft. In the released position of the position holding device, the clamping rollers are located in the middle in a double clamping ramp, with the smallest possible distance to the axis of rotation of the electric motor. In order to keep the pinch rollers reliably in this position, as long as the position holding device is released, the pinch rollers are acted upon by spring force, preferably in the form of a ring spring placed around the cage. In space-saving, the function of the clamping roller freewheel not impairing manner, the annular spring is inserted into annular grooves, which are located on the surface of the individual pinch rollers. The spring force of the annular spring is sufficient to prevent lifting of the pinch rollers from the shaft at all speeds occurring. Thus, in the free-running position of the position holding device, there is always a practically friction-free operation of the clamping roller freewheel.
Um den Klemmkäfig zu blockieren, d.h. die Positionshaltevorrichtung von der Freilaufposition in die die Welle blockierende Halteposition zu überführen, ist vorzugsweise eine die Welle ringförmig umgebende, axial verschiebliche Ankerplatte vorgesehen. Diese wirkt bevorzugt formschlüssig, insbesondere mittels einer Verzahnung, mit dem Klemmkäfig zusammen. Um die Ankerplatte im stromlosen Zustand in einer definierten Position, insbesondere der blockierenden Position, zu halten, ist zwischen die Ankerplatte und ein nicht rotierendes Teil des Elektromotors eine Feder gespannt, welche in raumsparender Weise bevorzugt als koaxial zur Welle angeordnete Schraubenfeder ausgebildet ist. Die Ankerplatte ist vorzugsweise durch Bestromung des Stators des Elektromotors axial verschiebbar. Nachfolgend wird ein Ausführungsbeispiel der Erfindung anhand einer Zeichnung näher erläutert. Hierin zeigen:In order to block the clamping cage, ie to transfer the position holding device from the freewheeling position into the holding position blocking the shaft, an armature plate which surrounds the shaft in an annular manner and is provided with an axially displaceable armature is preferably provided. This preferably acts positively, in particular by means of a toothing, with the clamping cage together. In order to hold the armature plate in the de-energized state in a defined position, in particular the blocking position, a spring is tensioned between the armature plate and a non-rotating part of the electric motor, which is preferably designed in a space-saving manner as coaxial with the shaft arranged coil spring. The armature plate is preferably axially displaceable by energizing the stator of the electric motor. An embodiment of the invention will be explained in more detail with reference to a drawing. Herein show:
Kurze Beschreibung der ZeichnungShort description of the drawing
Figur 1 in einer perspektivischen, teilweise geschnittenen Ansicht eine elektrische Antriebseinheit mit einer Vorrichtung zur Positionseinhaltung einer Welle,1 is a perspective, partially sectioned view of an electric drive unit with a device for maintaining the position of a shaft,
Figur 2 die Positionshaltevorrichtung der Antriebseinheit nach Figur2 shows the position holding device of the drive unit according to FIG
1 , und1, and
Figur 3 die Positionshaltevorrichtung nach Figur 2 in einer Explosionsdarstellung.Figure 3 shows the position holding device of Figure 2 in an exploded view.
Ausführliche Beschreibung der ZeichnungDetailed description of the drawing
Eine in Figur 1 dargestellte elektrische Antriebseinheit 1 setzt sich im Wesentlichen zusammen aus einem Elektromotor 2 und einer Positionshaltevorrichtung 3, welche dazu geeignet ist, eine mit einem Rotor 4 des Elektromotors 2 starr verbundene Welle 5 wahlweise zu blockieren oder freizugeben. Die Positions- haltevorrichtung 3 ist als schaltbarer, doppelt wirkender Klemmrollenfreilauf ausgebildet und befindet sich ebenso wie der Rotor 4 und ein mit diesem zusammenwirkender Stator 6 in einem Gehäuse 7 des Elektromotors 2. Das Gehäuse 7 setzt sich zusammen aus einem im Wesentlichen zylindrischen Mantelteil 8 sowie zwei Stirnteilen 9, 10, welche am Mantelteil 8 beispielsweise ver- schraubt sind. Der Rotor 4 sowie die Welle 5 sind mittels zweier Wälzlager 11 , 12, nämlich Kugellager, im Gehäuse 7 gelagert. Die einzelnen Kugeln 13 des Wälzlagers 12 kontaktieren einerseits die Welle 5 und andererseits das Stirnteil 10, welches das Gehäuse 7 auf der Seite der Positionshaltevorrichtung 3 abschließt.An electric drive unit 1 illustrated in FIG. 1 is essentially composed of an electric motor 2 and a position-holding device 3, which is suitable for selectively blocking or releasing a shaft 5 rigidly connected to a rotor 4 of the electric motor 2. The position holding device 3 is formed as a switchable, double-acting clamping roller freewheel and is located as well as the rotor 4 and a cooperating with this stator 6 in a housing 7 of the electric motor 2. The housing 7 is composed of a substantially cylindrical shell part 8 and two end parts 9, 10 which are screwed on the casing part 8, for example. The rotor 4 and the shaft 5 are mounted in the housing 7 by means of two rolling bearings 11, 12, namely ball bearings. The individual balls 13 of the rolling bearing 12 contact on the one hand the shaft 5 and on the other hand, the front part 10, which closes the housing 7 on the side of the position holding device 3.
An das Stirnteil 10 ist, wie insbesondere aus den Figuren 2 und 3 hervorgeht, ein nach innen, d.h. zum Rotor 4 hin, weisender ringförmiger Absatz 14 einstückig angeformt. Dieser Absatz 14 bildet eine Außenklemmbahn 15 für Klemmrollen 16 des Klemmrollenfreilaufs 3. Die Klemmrollen 16 sind in einem Klemmkäfig 17 geführt und von einer als Ringfeder ausgebildeten Feder 18 umgeben, die in jeweils einer Umfangsnut 19 der einzelnen Klemmrollen 16 einliegt. Die Ringfeder 18 belastet die Klemmrollen 16 mit einer Kraft radial nach innen, wobei sich jede Klemmrolle 16 mittig in einer an der Oberfläche der Welle 5 gebildeten Doppelklemmrampe 20 befindet. Somit dient die Feder 18 dazu, nicht nur die einzelnen Klemmrollen 16, sondern auch den gesamten Klemmkäfig 17 in Freilaufstellung zu halten. Alternativ kann auch in nicht dargestellter Weise mindestens eine separate Feder vorgesehen sein, um den Klemmkäfig 17 in Ruhe- oder Freilaufposition zu halten. In jedem Fall rotiert bei freigegebener Positionshaltevorrichtung 3 der Klemmkäfig 17 mit der Welle 5, wobei die Klemmrollen 16 die Außenklemmbahn 15 nicht kontaktieren.As can be seen in particular from FIGS. 2 and 3, the front part 10 has an inward, ie. towards the rotor 4, pointing annular shoulder 14 integrally formed. This paragraph 14 forms an outer clamping track 15 for pinch rollers 16 of the clamping roller freewheel 3. The pinch rollers 16 are guided in a clamping cage 17 and surrounded by a designed as an annular spring spring 18 which rests in each case a circumferential groove 19 of the individual clamping rollers 16. The annular spring 18 loads the clamping rollers 16 with a force radially inwardly, wherein each pinch roller 16 is located centrally in a double clamping ramp 20 formed on the surface of the shaft 5. Thus, the spring 18 serves to keep not only the individual pinch rollers 16, but also the entire clamping cage 17 in freewheeling position. Alternatively, at least one separate spring may be provided in a manner not shown in order to keep the clamping cage 17 in rest or freewheeling position. In any case, when the position holding device 3 is released, the clamping cage 17 rotates with the shaft 5, wherein the clamping rollers 16 do not contact the outer clamping track 15.
Um die Positionshaltevorrichtung 3 freizugeben, d.h. eine Rotation der Welle 5 zu ermöglichen, muss eine die Welle 5 ringförmig umgebende Ankerplatte 21 von dem Stirnteil 10 abgehoben werden. Die Ankerplatte 21 weist einen äußeren, in der Anordnung nach Figur 2 an dem Stirnteil 10 anliegenden Radialbereich 22, einen dem Absatz 14 benachbarten, zu diesem parallel verlaufenden Axialbereich 23, sowie einen inneren Radialbereich 24 auf, der den Klemmrollen 16 axial benachbart ist. Im inneren Radialbereich 24 ist eine Verzahnung 25 ausgebildet, welche zur formschlüssigen Zusammenwirkung mit einer Verzahnung 26 des Klemmkäfigs 17 vorgesehen ist. Hierbei hat der Klemmkäfig 17 relativ zur Ankerplatte 21 ein definiertes Spiel in Umfangsrichtung. Die Anker- platte 21 ist durch eine in Figur 2 nicht erkennbare Führung gegen Verdrehung gesichert. Befindet sich die Ankerplatte 21 in der in Figur 2 dargestellten, am Stirnteil 10 anliegenden Position, so wird bei einer Verdrehung der Welle 5 der Klemmkäfig 17 zunächst so lange mit dieser mitgedreht, bis die Verzahnung 26 des Klemmkäfigs 17 an der Verzahnung 25 der Ankerplatte 21 anschlägt. Bei der weiteren Verdrehung der Welle 5 verlassen die Klemmrollen 16 die Mittelposition der Doppelklemmrampen 20, so dass die Klemmrollen 16 radial nach außen in Richtung zur Außenklemmbahn 15 verlagert werden, bis schließlich die erwünschte Klemmwirkung eintritt und damit die Welle 5 relativ zum Gehäuse 7 blockiert wird. Im Gegensatz zu einer unmittelbar formschlüssigen Blockierung, beispielsweise mittels eines in eine Kontur einer Welle eingreifenden Blockierelementes, wird somit die Welle 5 durch den Klemmrollenfreilauf 3 zwar innerhalb eines geringen Winkelbereiches, aber dennoch nicht abrupt gestoppt. Übermäßige Belastungen oder Beschädigungen der Positionshaltevorrichtung 3 werden somit vermieden.In order to release the position holding device 3, ie to allow a rotation of the shaft 5, an anchor plate 21 surrounding the shaft 5 must be lifted off the front part 10. The armature plate 21 has an outer, in the arrangement of Figure 2 on the end portion 10 adjacent radial portion 22, a paragraph 14 adjacent to this parallel axial portion 23, and an inner radial portion 24 which is adjacent to the pinch rollers 16 axially. In the inner radial region 24, a toothing 25 is formed, which is provided for positive engagement with a toothing 26 of the clamping cage 17. Here, the clamping cage 17 has relative to the anchor plate 21 a defined game in the circumferential direction. The anchor plate 21 is secured against rotation by a guide (not visible in FIG. 2). If the anchor plate 21 is in the position shown in FIG. 2, which bears against the front part 10, the clamping cage 17 is first rotated along with it as long as the shaft 5 rotates until the toothing 26 is rotated of the clamping cage 17 abuts the toothing 25 of the anchor plate 21. During the further rotation of the shaft 5, the pinch rollers 16 leave the center position of the double clamping ramps 20, so that the pinch rollers 16 are displaced radially outwards in the direction of the outer clamping track 15, until finally the desired clamping effect occurs and thus the shaft 5 is blocked relative to the housing 7 , In contrast to a direct form-fitting blocking, for example by means of a blocking element engaging in a contour of a shaft, the shaft 5 is thus stopped by the clamping roller freewheel 3, although not abruptly within a small angular range. Excessive loads or damage to the position holding device 3 are thus avoided.
Die Ankerplatte 21 wird mittels einer die Welle 5 koaxial umgebenden Schraubenfeder 27 permanent mit einer Kraft in Richtung zur in Figur 2 dargestellten Blockierposition belastet. Die in Axialrichtung verschiebliche Ankerplatte 21 bildet zusammen mit dem Stator 6 einen elektromagnetischen Aktuator, wobei der Stator 6 als Hubmagnet 28 wirkt. Sobald der Stator 6 bestromt wird, wird die Ankerplatte 21 gegen die Kraft der Schraubenfeder 27 in Richtung zum Stator 6 gezogen, wobei die Positionshaltevorrichtung 3 freigegeben wird. Bei Strom- ausfall kehrt die Ankerplatte 21 selbsttätig in die in Figur 2 dargestellte Blockierposition zurück. The armature plate 21 is permanently loaded by means of a helical spring 27 coaxially surrounding the shaft 5 with a force in the direction of the blocking position shown in FIG. The axially displaceable armature plate 21 forms together with the stator 6 an electromagnetic actuator, wherein the stator 6 acts as a solenoid 28. Once the stator 6 is energized, the armature plate 21 is pulled against the force of the coil spring 27 in the direction of the stator 6, wherein the position holding device 3 is released. In case of power failure, the anchor plate 21 automatically returns to the blocking position shown in Figure 2.
BezugszeichenlisteLIST OF REFERENCE NUMBERS
1 Elektrische Antriebseinheit1 Electric drive unit
2 Elektromotor2 electric motor
3 Positionshaltevorrichtung, Klemmrollenfreilauf3 position holding device, clamping roller freewheel
4 Rotor4 rotor
5 Welle5 wave
6 Stator6 stator
7 Gehäuse7 housing
8 Mantelteil8 casing part
9 Stirnteil9 front part
10 Stirnteil10 front part
11 Wälzlager11 rolling bearings
12 Wälzlager12 rolling bearings
13 Kugel13 ball
14 Absatz14 paragraph
15 Außenklemmbahn15 outdoor track
16 Klemmrolle16 pinch roller
17 Klemmkäfig17 clamping cage
18 Feder18 spring
19 Umfangsnut19 circumferential groove
20 Doppelklemmrampe20 double clamping ramp
21 Ankerplatte21 anchor plate
22 äußerer Radialbereich22 outer radial area
23 Axialbereich23 axial area
24 innerer Radialbereich24 inner radial area
25 Verzahnung25 toothing
26 Verzahnung26 toothing
27 Schraubenfeder27 coil spring
28 Hubmagnet 28 lifting magnet

Claims

Patentansprüche claims
1. Elektrische Antriebseinheit mit Vorrichtung zur Positionseinhaltung einer Welle, mit einem einen Rotor (4), einen Stator (6) und ein Ge- häuse (7) aufweisenden Elektromotor (2), einer mit dem Rotor (4) verbundenen Welle (5), sowie einer auf die Welle (5) wirkenden Posi- tionshaltevorrichtung (3), dadurch gekennzeichnet, dass die Positi- onshaltevorrichtung (3) als schaltbarer, doppelt wirkender, in das Gehäuse (7) integrierter Klemmrollenfreilauf ausgebildet ist.1. Electric drive unit with a device for maintaining the position of a shaft, comprising a rotor (4), a stator (6) and a housing (7) having an electric motor (2), connected to the rotor (4) shaft (5) and a position holding device (3) acting on the shaft (5), characterized in that the position holding device (3) is designed as a switchable, double-acting clamping roller freewheel integrated in the housing (7).
2. Antriebseinheit nach Anspruch 1 , dadurch gekennzeichnet, dass die Positionshaltevorrichtung (3) magnetisch schaltbar ist.2. Drive unit according to claim 1, characterized in that the position holding device (3) is magnetically switchable.
3. Antriebseinheit nach Anspruch 2, dadurch gekennzeichnet, dass zur Betätigung der Positionshaltevorrichtung (3) ein Hubmagnet (28) vorgesehen ist, welcher integraler Bestandteil des Stators (6) des E- lektromotors (2) ist.3. Drive unit according to claim 2, characterized in that for actuating the position holding device (3), a lifting magnet (28) is provided, which is an integral part of the stator (6) of the electric motor (2).
4. Antriebseinheit nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass die Positionshaltevorrichtung (3) im stromlosen Zustand blockierend ausgebildet ist.4. Drive unit according to claim 2 or 3, characterized in that the position holding device (3) is designed blocking in the de-energized state.
5. Antriebseinheit nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass die Positionshaltevorrichtung (3) im bestromten Zustand blockie- rend ausgebildet ist.5. Drive unit according to claim 2 or 3, characterized in that the position holding device (3) in the energized state blocking is formed.
6. Antriebseinheit nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass eine Außenklemmbahn (15) des Klemmrollenfreilaufs (3) einstückig mit einem Stirnteil (10) des Gehäuses (7) ausgebildet ist. 6. Drive unit according to one of claims 1 to 5, characterized in that an outer clamping track (15) of the clamping roller freewheel (3) is formed integrally with an end part (10) of the housing (7).
7. Antriebseinheit nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass die Positionshaltevorrichtung (3) axial zwischen zwei Lagern (1 1 , 12), insbesondere Wälzlagern, des Elektromotors (2) angeordnet ist.7. Drive unit according to one of claims 1 to 6, characterized in that the position holding device (3) axially between two bearings (1 1, 12), in particular rolling bearings, of the electric motor (2) is arranged.
8. Antriebseinheit nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass der Klemmrollenfreilauf (3) einen eine Anzahl Klemmrollen (16) führenden Klemmkäfig (17) aufweist, welcher in freigegebener Stellung der Positionshaltevorrichtung (3) mit der Welle (5) ro- tiert und in blockierter Stellung der Positionshaltevorrichtung (3) relativ zum Gehäuse (7) fixiert ist.8. Drive unit according to one of claims 1 to 7, characterized in that the clamping roller freewheel (3) has a number of clamping rollers (16) leading clamping cage (17) which in the released position of the position holding device (3) with the shaft (5) ro - Tiert and fixed in the blocked position of the position holding device (3) relative to the housing (7).
9. Antriebseinheit nach Anspruch 8, dadurch gekennzeichnet, dass zur Blockierung des Klemmkäfigs (17) eine die Welle (5) ringförmig umgebende, axial verschiebliche Ankerplatte (21 ) vorgesehen ist.9. Drive unit according to claim 8, characterized in that for blocking the clamping cage (17) a shaft (5) annularly surrounding, axially displaceable armature plate (21) is provided.
10. Antriebseinheit nach Anspruch 9, dadurch gekennzeichnet, dass die Ankerplatte (21 ) formschlüssig, insbesondere mittels einer Verzahnung (25), mit dem Klemmkäfig (17) zusammenwirkt.10. Drive unit according to claim 9, characterized in that the anchor plate (21) positively, in particular by means of a toothing (25), cooperates with the clamping cage (17).
11. Antriebseinheit nach Anspruch 9 oder 10, dadurch gekennzeichnet, dass die Ankerplatte (21 ) durch eine koaxial zur Welle (5) angeordnete Schraubenfeder (27) mit einer Kraft belastet ist.11. Drive unit according to claim 9 or 10, characterized in that the armature plate (21) by a coaxial with the shaft (5) arranged coil spring (27) is loaded with a force.
12. Antriebseinheit nach einem der Ansprüche 8 bis 1 1 , gekennzeichnet durch eine die Klemmrollen (16) in freigegebener Stellung der Positionshaltevorrichtung (3) in nicht blockierender Lage haltende Feder (18). 12. Drive unit according to one of claims 8 to 1 1, characterized by a clamping rollers (16) in the released position of the position holding device (3) in non-blocking position holding spring (18).
13. Antriebseinheit nach Anspruch 12, dadurch gekennzeichnet, dass die Feder (18) als um den Klemmkäfig (17) gelegte Ringfeder ausgebildet ist.13. Drive unit according to claim 12, characterized in that the spring (18) is designed as around the clamping cage (17) set ring spring.
14. Antriebseinheit nach Anspruch 13, dadurch gekennzeichnet, dass die Klemmrollen (16) jeweils eine zur Aufnahme der Ringfeder (18) vorgesehene Umfangsnut (19) aufweisen. 14. Drive unit according to claim 13, characterized in that the clamping rollers (16) each have one for receiving the annular spring (18) provided for circumferential groove (19).
PCT/EP2007/059233 2006-09-26 2007-09-04 Electric drive unit having a device for maintaining the position of a shaft WO2008037569A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200610045231 DE102006045231A1 (en) 2006-09-26 2006-09-26 Electric drive unit with device for maintaining the position of a shaft
DE102006045231.3 2006-09-26

Publications (1)

Publication Number Publication Date
WO2008037569A1 true WO2008037569A1 (en) 2008-04-03

Family

ID=38670772

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2007/059233 WO2008037569A1 (en) 2006-09-26 2007-09-04 Electric drive unit having a device for maintaining the position of a shaft

Country Status (2)

Country Link
DE (1) DE102006045231A1 (en)
WO (1) WO2008037569A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009039627A1 (en) 2009-09-01 2011-03-03 Schaeffler Technologies Gmbh & Co. Kg Switchable clamping roller freewheel
DE102010000999B4 (en) * 2010-01-19 2018-03-01 Siemens Aktiengesellschaft Dynamoelectric machine with rotor blocking device
DE102013021877B4 (en) * 2013-12-21 2017-02-23 Thomas Magnete Gmbh Electromechanical device for switchable positive connection of rotational bodies

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19933242A1 (en) * 1998-07-16 2000-01-20 Ntn Toyo Bearing Co Ltd Force transmission device for use in hybrid vehicle to transmit and separate drive force from IC engine or motor has two-way clutch with engagement elements and control device to lock and release it
EP1426643A1 (en) * 2002-12-04 2004-06-09 Ntn Corporation Roller clutch and driveline assembly
DE10344211A1 (en) * 2003-09-24 2005-04-21 Bosch Gmbh Robert Device for position maintenance of rotatably or movably mounted shaft with surface, especially electric motor armature shaft, has actively operable final control element connected at least to one end of looping body passed around shaft
US20060185956A1 (en) * 2005-02-21 2006-08-24 Makoto Yasui Rotation transmission device

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB140380A (en) * 1919-03-18 1920-12-09 Anonima A B G D Soc Improvements in or relating to automatic clutches for shafts
US3050321A (en) * 1957-11-15 1962-08-21 John R Howe Auxiliary drive clutch mechanism
GB2219637B (en) * 1988-06-08 1992-05-06 Mitsubishi Electric Corp Electromagnetic clutch in motor-powered drive device
DE69700552T2 (en) * 1996-02-26 2000-05-18 Denso Corp Spring ring for free coupling and starter with such a ring
US6135255A (en) * 1998-12-09 2000-10-24 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Resealable roller clutch

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19933242A1 (en) * 1998-07-16 2000-01-20 Ntn Toyo Bearing Co Ltd Force transmission device for use in hybrid vehicle to transmit and separate drive force from IC engine or motor has two-way clutch with engagement elements and control device to lock and release it
EP1426643A1 (en) * 2002-12-04 2004-06-09 Ntn Corporation Roller clutch and driveline assembly
DE10344211A1 (en) * 2003-09-24 2005-04-21 Bosch Gmbh Robert Device for position maintenance of rotatably or movably mounted shaft with surface, especially electric motor armature shaft, has actively operable final control element connected at least to one end of looping body passed around shaft
US20060185956A1 (en) * 2005-02-21 2006-08-24 Makoto Yasui Rotation transmission device

Also Published As

Publication number Publication date
DE102006045231A1 (en) 2008-04-03

Similar Documents

Publication Publication Date Title
EP1971791B1 (en) Selective freewheeling mechanism and electromechanical vehicle brake comprising a selective freewheeling mechanism
EP0944781B1 (en) Electromechanical brake
WO2005111458A1 (en) Disengaging free-wheel and electromechanical vehicle brake having a disengaging free-wheel
DE202014002459U1 (en) Disc brake and brake actuation mechanism for a disc brake
EP1594212A2 (en) Geared motor with fail-safe arrangement
WO2009121434A1 (en) Starting device
EP1912840B1 (en) Electromechanical brake
WO1998025046A1 (en) Wheel-mounted electro-mechanical brake
CH668451A5 (en) DEVICE FOR ELECTROMAGNETIC LOCKING ON A LOCKING CYLINDER FOR A MECHANICAL / ELECTRONIC LOCKING SYSTEM.
DE4213570C2 (en)
EP2172645B1 (en) Starting device
WO2007074026A2 (en) Locking unit, especially for a superimposed steering system
WO2008037569A1 (en) Electric drive unit having a device for maintaining the position of a shaft
EP0136282B2 (en) Device for braking electric motors
DE10127487A1 (en) Bearing unit with braking and/or holding function has brake element axially movable and able to be pressed against counter-surface to create braking effect
EP1688575B1 (en) Drive unit
EP3152095B1 (en) Plastic sleeve for securing a ball recirculation and for centering a corrugated spring and a shim in a steering mechanism
WO2015014350A1 (en) Step-by-step mechanism
DE102016207927B4 (en) actuator
DE102008017225A1 (en) Adjusting device for adjusting air gap of electromechanical brake, has cam mechanism for transformation of rotary motion into linear motion, where cam mechanism has cam disk arranged around reference axis in rotating manner
EP1030981B1 (en) Electromechanical brake for motor vehicles
WO2018192600A1 (en) Roller screw drive
DE202021003041U1 (en) Coupling device for a linear drive device and linear drive device and piece of furniture with the same
DE202004001042U1 (en) Electromagnetically opening spring pressure brake has permanent magnet(s) that pulls brake disk against brake surface(s) against spring force, electromagnet that releases disk from braking surface(s)
DE102007035748A1 (en) Blocking device for a gear-drive unit in a vehicle comprises a spring element and a braking spring element for stopping an adjusting movement from the blocking position into a releasing position

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 07820037

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 07820037

Country of ref document: EP

Kind code of ref document: A1