WO2011050782A1 - Spindelaktor - Google Patents
Spindelaktor Download PDFInfo
- Publication number
- WO2011050782A1 WO2011050782A1 PCT/DE2010/001249 DE2010001249W WO2011050782A1 WO 2011050782 A1 WO2011050782 A1 WO 2011050782A1 DE 2010001249 W DE2010001249 W DE 2010001249W WO 2011050782 A1 WO2011050782 A1 WO 2011050782A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- housing
- spindle
- threaded spindle
- axially
- sensor
- Prior art date
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
- F16H—GEARING
- F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
- F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
- F16H25/20—Screw mechanisms
- F16H25/2021—Screw mechanisms with means for avoiding overloading
-
- 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
- F16D29/00—Clutches and systems of clutches involving both fluid and magnetic actuation
- F16D29/005—Clutches and systems of clutches involving both fluid and magnetic actuation with a fluid pressure piston driven by an electric motor
-
- 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
- F16H—GEARING
- F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
- F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
- F16H25/20—Screw mechanisms
- F16H2025/2062—Arrangements for driving the actuator
- F16H2025/2075—Coaxial drive motors
Definitions
- the invention relates to a spindle actuator, in particular for acting on a piston of a master cylinder with a housing, a rotatably mounted on this threaded spindle, a rotatably mounted on this and the housing rotatably arranged spindle nut and accommodated in the housing and the threaded spindle driving electric motor with a stator and a Rotor firmly connected to the threaded spindle and a sensor device for detecting a load applied by the spindle nut on a component axially displaced therefrom.
- Generic spindle actuators are used as drives with a gear, wherein the threaded spindle, for example a ball screw driven by a rotary drive by an electric motor and the spindle nut axially displaceable component, such as the piston of a master cylinder of a Hydrostataktors for actuating a friction clutch or a brake in a Motor vehicle, axially displaced.
- the threaded spindle for example a ball screw driven by a rotary drive by an electric motor
- the spindle nut axially displaceable component such as the piston of a master cylinder of a Hydrostataktors for actuating a friction clutch or a brake in a Motor vehicle, axially displaced.
- a correspondingly expensive sensor device is necessary.
- a pressure sensor can be introduced, which detects the pressure in the pressure chamber of the master cylinder depending on the axial movement of the formed as an axially displaced component piston.
- the object of the invention is to develop generic spindle actuators such that the load can be detected by means of a sensor device with simple and in particular of the type of embodiment of the axially displaceable component independent sensors.
- a spindle actuator having a housing, a threaded spindle rotatably mounted thereon, a spindle nut rotatable on the housing and rotationally fixed relative to the housing, and an electric motor accommodated in the housing and driving the threaded spindle with a stator and a rotor firmly connected to the threaded spindle and a sensor device for detecting a load applied by the spindle nut on a axially displaced from this component load, wherein the threaded spindle relative to the housing against the action of at least one axially effective energy storage axially limited displaceable and a Axialweg the threaded spindle is detected by the sensor device.
- a simple displacement sensor system can be determined with a corresponding, for example, empirically determined knowledge of the behavior of the axially displaceable component for determining the load applied to the spindle nut.
- a relative determination of the load may be sufficient to detect, for example, an overload of the electric motor, a start of an obstacle, for example a stop of the spindle nut and / or the axially displaced component and to initiate appropriate measures.
- control operations of the electric motor can be provided depending on the determined Axialweg and derived therefrom load sizes of the spindle nut and / or the axially displaced component.
- the determination of the axial travel of the threaded spindle is independent of the type of the downstream axially displaceable component, so that a universally designed spindle drive can be provided for many applications.
- the axial travel of the threaded spindle is limited.
- the Axialweg is preferably limited to a certain proportion of the axial travel of the spindle nut, so that no negative effects of the axial displacement of the threaded spindle are to be expected on the axial displacement of the component. Accordingly, the Axialweg the threaded spindle is only a fraction of the Axialwegs as stroke of the spindle nut.
- the Axialweg the threaded spindle is limited by stops, along the axial travel of the threaded spindle are provided axially effective, corresponding stiff trained energy storage.
- the sensor device serves in particular to detect load situations in the region of stops of the spindle nut or of the downstream axially displaceable component. If it is, for example, a master cylinder, the path of the piston can be formed by a stop in a rest position and a stop at fully loaded pressure chamber. According to the inventive idea, a detection of a load state upon reaching one or both stops can each serve to limit the power of the electric motor. In this case, the load determined from the detected axial travel or the detected axial travel can itself serve as a control or controlled variable.
- the dynamics of the spindle actuator depending on the determined load or the detected Axialwegs for example, the speed of the axial movement of the spindle nut can be adjusted by appropriate control of the electric motor already at an approach to a stop.
- a clutch actuator while the load of the Spindelaktors can be limited if, for example, a pressed-friction clutch is completely closed and / or when the friction clutch is fully open and the piston is completely relieved.
- two axially elastic stops of the threaded spindle can be provided, wherein the threaded spindle in a stop of the spindle nut or the axially displaceable component under bias of an axially effective energy storage is shifted and generates a path signal to a displacement sensor of the sensor device until the threaded spindle itself moves against the stop on the housing.
- the threaded spindle can move in the same manner against a housing stop when the arranged by the spindle nut or the axial component on the other side of the spindle stroke stop is reached.
- the threaded spindle is held between the stops of the spindle nut in a neutral, set by the axially effective energy storage position.
- the axially effective energy storage may be disc springs, diaphragm springs, helical compression springs or packet-shaped laminations of these.
- Other energy storage such as elastically deformable plastic rings are used.
- the rigidity of this depends on the loads occurring at the spindle nut and the natural frequencies of the spindle actuator and in particular the rotor / spindle unit relative to the housing. In this case, a stiffness of the energy storage is selected which does not lead to an excitation of natural frequencies.
- the energy storage can also come from the rigidity of the actuator housing itself
- the threaded spindle by means of a
- the characteristics of the two axially, each effective for a stop energy storage can be decoupled from each other.
- the housing for the outer ring in one direction form a stop and the outer ring in the opposite direction to a limited axially limited between two axial stops of the housing axially displaceable, supported by an axially effective energy storage on the housing limiting element be relocatable.
- the sensor device can have a sensor which detects the axial travel of the threaded spindle analogously with a sensor part fixed to the threaded spindle and to the housing.
- a sensor as the displacement sensor may be formed by a potentiometer, wherein in an advantageous manner, an electrical resistance is fixed to the housing and arranged on this sliding contact on the threaded spindle.
- a potentiometer wherein in an advantageous manner, an electrical resistance is fixed to the housing and arranged on this sliding contact on the threaded spindle.
- linearly increasing or decreasing resistance develops, for example.
- an analog magnetic field sensor with, for example, housing fixedly arranged sensor element and arranged on the threaded spindle resulting from a neutral position between two stops at an axial displacement of the threaded spindle along its Axialwegs to the displacement sensor each have a signal image in the form of sine half-waves in both directions .
- the amplitude of the sine or cosine half-wave is detected and evaluated.
- the change in amplitude can be used to determine the axial travel by evaluating this and the amplitude before application of an arctangent function or before amplification of the detected signals.
- the sensor device may comprise a sensor which detects the axial travel of the threaded spindle digitally, for example by means of a digital magnetic field sensor such as switched Hall sensor, with a sensor part fixed to the threaded spindle and to the housing. It has proved to be advantageous if the change of the detected signal with this signal compared with the rotational movement of the threaded spindle and the polarity of the rotating sensor magnet is used. In this case, the arranged on the threaded spindle sensor part such as sensor magnet is far away from the housing fixed sensor part with a large Axialweg and whose magnetic field is not detected by the housing-fixed sensor part and thus switches with a change in polarity.
- a digital magnetic field sensor such as switched Hall sensor
- the sensor magnet when reducing the axial travel, enters the detection range of the sensor part arranged fixed to the housing, it can detect and switch a polarity change.
- a digital sensor only one stop of the threaded spindle can be detected. To detect two stops two such sensors are required.
- the magnetic field strength detected by the housing part arranged sensor part can be adjusted by appropriate magnetic field screens.
- switches can be provided with switching positions for a respective stop and an intermediate position.
- the sensor device can detect operating variables of the spindle actuator, in particular of the electric motor, and can be provided for determining the axial travel of the threaded spindle or the load applied to the spindle nut. For example, the current flowing through the electric motor can be evaluated to determine the load. If the spindle is driven against a stop, the current increases by the compression of the axially effective energy storage by a predetermined detectable amount. Alternatively, the voltage for speed control or a pulse width ratio at the output stages for controlling the electric motor can be evaluated.
- the change in the rotational speed of the electric motor for detecting a stop of the threaded spindle can be evaluated at a stop. Furthermore, a change in the motor constant of the electric motor can be evaluated. This is based on the observation that the rotor moves at least slightly out of the stator in the case of a displacing threaded spindle, thus changing the motor constant and the resulting torque. A further possibility for detecting the axial travel results from the evaluation of the inductance with the rotor moving out of the stator. If a change in the motor constant in a displacement of the threaded spindle does not occur, the stator can be axially extended axially relative to the rotor by the predetermined axial travel of the threaded spindle.
- the Spindelaktor according to the inventive idea is not only suitable for detecting attacks of the threaded spindle at the attacks. Rather, in a detection of the axial travel of the spindle nut or of this axially displaced component by means of a not absolutely measuring displacement sensor, for example, an Inkrementalweg- sensors, by the stop of the threaded spindle on one or two stops a reference position of the spindle nut can be determined at the displacement sensor the spindle nut is calibrated.
- the stop of the threaded spindle is assigned to the two stops in each case an extreme position of the spindle nut, for example, in a hydrostatic clutch actuator the two stop positions of the master cylinder at full stand.
- the incremental displacement sensor is calibrated to one of the two positions or an intermediate position determined therefrom. In this way, from the number of increments for the entire stroke of the spindle nut and the number of measured increments, the position of the spindle nut can be determined.
- the incremental travel sensor can be provided in or on the rotor for detecting the rotor rotation angle in the form of angular increments so that the axial travel and stroke of the spindle nut can be determined via the ratio of threaded spindle and spindle sleeve and at the same time the electric motor can be commutated electronically by means of the detected signals.
- the object is therefore also by a spindle actuator with a housing, a rotatably mounted on this threaded spindle, rotatably mounted on this and rotatably relative to the housing arranged spindle nut and a recorded in the housing and the threaded spindle driving electric motor with a stator and fixed to the threaded spindle associated rotor and a sensor device for detecting a load applied by the spindle nut on a axially displaced from this component load, wherein axially effective between the threaded spindle and the housing at least in a load direction of the threaded spindle, a piezoelectric element is arranged.
- the invention is further achieved by a Hydrostataktor with the spindle actuator described in the application documents, which has a master cylinder with a displaceable in a housing piston, which is axially displaced by the spindle nut of the Spindelaktors.
- the piston builds pressure in a pressure chamber formed by housing and piston, which actuates a slave cylinder via a pressure line, which acts on a hydraulically actuated in this way friction clutch, a hydraulically actuated brake or the like.
- FIG. 1A shows a schematic representation of a Spindelaktors in section, mounted on a motor bearing 15,
- 1 B is a schematic representation of a Spindelaktors in section, mounted on the engine mount 15 and a movable bearing,
- FIG. 2 shows a diagram of a load in a spindle actuator actuating a master cylinder
- FIG. 3 shows a modified mounting of the threaded spindle relative to FIG. 1;
- FIG. 4 shows a further bearing arrangement which has been modified with respect to FIGS
- Figure 5 shows a comparison with Figures 1 A, 3 and 4 changed storage of
- FIG. 1 A shows the Spindelaktor 1, here as a hydrostatic actuator 2 with a master cylinder 3, which is connected via a pressure line with a slave cylinder, not shown, in a schematic cross-sectional view.
- the Spindelaktor 1 contains the threaded spindle 4, which is driven by the rotor 5 of the fixed housing 6 with its stator in the housing 7 only partially shown arranged electric motor 8.
- the threaded spindle 4 is displaceable together with a motor bearing 15 described in detail below.
- the spindle nut 9 is relatively rotatably arranged, which is rotatably and axially displaceably received in the housing 7.
- the threaded spindle 4 and the spindle nut 9 may be formed as a simple spindle drive, as a ball screw or the like. Threaded spindle and spindle nut can also be designed as a planetary rolling gear.
- the spindle nut 9 is axially fixedly connected to the piston 10 of the master cylinder 3 and displaces it axially when the threaded spindle 4 is driven by the electric motor 8.
- the threaded spindle 4 relative to the housing 7 is arranged axially limited displaceable.
- the threaded spindle by means of a roller bearing 15, for example a deep groove ball bearing, and optionally by another - not shown floating bearing - centered on the housing 7 rotatably received, wherein the inner ring 16 of the bearing 15 is fixedly connected to the threaded spindle 4, for example by means of a press fit and the Outer ring 17 is axially displaceably accommodated on the housing 7 so as to be displaced on both sides by axially effective energy stores 18, 19 (- 'sensor springs') relative to the housing 7.
- the bearing with an additional movable bearing G is shown in FIG
- the axial paths B1, B2 shown oversized in this illustration for the sake of clarity result in a displacement of the threaded spindle 4 against the housing 7 when the rigidity of the energy stores 18, 19 is overcome a shift of Threaded spindle 4 only occurs when the spindle nut 9 encounters a stop or the spindle actuator exceeds a predetermined load L.
- the Axialweg B1 thus describes the edge region of the movement of the actuator at the stop 22 at "clutch open” and the Axialweg B2 describes the edge region of the stop 23 at "clutch closed”.
- a sensor device can be proposed, which determines such a load behavior in a control unit of the electric motor 8, for example by evaluating the operating current, so that the stops 22, 23 of the outer ring 17 are detected on the housing 7 and optionally the power of the electric motor 8 is limited. This can be deduced the position of the rest position 12 and the working position 13 and these are determined accordingly.
- the actuator is displaced in the boundary regions B1 and B2 in case of loss of confidence in a position determination only speed and force-limited. In any case, in the event of a fault, the edge areas should only be used as a rolling area for the actuator.
- the stator 6 can have axial extensions 24.
- the rotor 5 can be axially fixed to the threaded spindle 4 and axially displaceable and axially fixed and rotatable connected to the housing 7 or stator 6 or the entire electric motor 8 relative to the housing 7 rotatably and axially displaceable.
- the sensor device 25 for detection of measured data for determining the axial paths B1, B2 provided.
- a digital or analog sensor 26 such as a potentiometer, a non-contact sensor such as magnetic field sensor, switched Hall sensor or the like with a sensor part 27 mounted fixed to the housing and provided on the threaded spindle sensor part 28 is provided, the axial distance between the two sensor parts 27th , 28 and thus at least one of the two Axialwege B1, B2 determined, so that in a control unit of the electric motor 8 on the position of the piston 10 in particular at the extreme positions of the rest position 12 and the working position 13 can be closed.
- part 28 is formed as a magnet and part 27 as a magnetic sensor.
- the present hydrostatic actuator is self-locking.
- the counterforce in the vicinity of the sniffer bore is low. Furthermore, the counterforce in the vicinity of the stop when clutch is closed very large.
- a possible sensor for detecting the edge region can be integrated very cost-effectively in the case of a coupling, wherein this sensor can simultaneously be used as a reference mark.
- Figure 3 shows a schematic representation of a section through an amended relative to Figure 1 storage of the threaded spindle 4 in the housing 7.
- the outer ring 17 of the rolling bearing 15 is in this case against the housing 7 against the action of the energy storage 18, 19 braced, which decouples from each other with respect to their characteristics are.
- the path of the energy storage 18, 19 is limited by means of the limiting elements 29, 30, so that via the axial paths B1, B2 respectively only or the strained between the respective limiting element 29, 30 and the housing energy storage 18 and 19 are effective.
- the limiting elements 29, 30 are displaceable between the housing-side stops 22, 22a and 23, 23a, wherein in the shown neutral position of the threaded spindle 4 both energy storage by the stop 22a, 23a off and take effect on displacement of the threaded spindle 4.
- Figure 4 shows a variant relative to the mounting of the threaded spindle 4 of Figure 3 with a limited means of the limiting element 30 via the axial path of the threaded spindle 4 energy storage 19 and its effect over the entire Axialweg the spindle unfolding energy storage 18, located directly between the housing 7 and the outer ring 17 is supported.
- Figure 5 shows, in contrast to the bearings of the threaded spindle 4 on the housing 7 a directly supported on the housing 7 outer ring 17, which is axially displaceable axially against the action of the shut-off by means of the limiting element 30 energy storage device 19 relative to the housing 7 only in one direction. To avoid a permanent bias of the outer ring 17 relative to the housing 7, this is turned off at the stop 23a in the neutral position of the threaded spindle 4.
- the axially effective energy storage 18 and 19 shown in the preceding figures depending on the requirements of the displaced in the corresponding direction threaded spindle 4 may have the same or different characteristics and from disc springs, diaphragm springs, distributed over the circumference helical compression springs or the like are formed.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE112010004249.7T DE112010004249B4 (de) | 2009-11-02 | 2010-10-26 | Spindelaktor |
CN201080043889.1A CN102549306B (zh) | 2009-11-02 | 2010-10-26 | 主轴致动器 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102009051721 | 2009-11-02 | ||
DE102009051721.9 | 2009-11-02 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2011050782A1 true WO2011050782A1 (de) | 2011-05-05 |
Family
ID=43530663
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2010/001249 WO2011050782A1 (de) | 2009-11-02 | 2010-10-26 | Spindelaktor |
Country Status (3)
Country | Link |
---|---|
CN (1) | CN102549306B (de) |
DE (2) | DE112010004249B4 (de) |
WO (1) | WO2011050782A1 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102012220712A1 (de) | 2011-12-08 | 2013-06-13 | Schaeffler Technologies AG & Co. KG | Verfahren zur Steuerung eines Aktors zur Betätigung einer Bremse eines Startergetriebes zum Starten eines Kraftfahrzeugmotors sowie Startergetriebeanordnung |
DE102013218549A1 (de) * | 2013-09-17 | 2015-03-19 | Continental Teves Ag & Co. Ohg | Elektrohydraulischer Aktuator |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102013217470A1 (de) * | 2012-09-25 | 2014-03-27 | Schaeffler Technologies Gmbh & Co. Kg | Betätigungsvorrichtung |
DE112013004724B4 (de) | 2012-09-26 | 2019-10-10 | Schaeffler Technologies AG & Co. KG | Ausrücksystem für eine Kupplung eines Kraftfahrzeuges |
DE102013201473A1 (de) | 2013-01-30 | 2014-07-31 | Schaeffler Technologies Gmbh & Co. Kg | Betätigungssystem für eine Kupplung eines Kraftfahrzeuges |
DE102014223479B3 (de) * | 2014-11-18 | 2016-04-07 | Schaeffler Technologies AG & Co. KG | Verfahren zur Einstellung einer Anschlagposition eines hydrostatischen Kupplungsaktors |
DE102015211531B4 (de) | 2015-06-23 | 2018-04-05 | Schaeffler Technologies AG & Co. KG | Elektrische Maschine mit variabler Motorkonstante, Aktor mit der elektrischen Maschine und Verfahren zur Variation der Motorkonstante der elektrischen Maschine |
CN105422770A (zh) * | 2015-11-13 | 2016-03-23 | 兰州飞行控制有限责任公司 | 一种丝杠副的精确限位装置 |
WO2018097615A1 (ko) * | 2016-11-23 | 2018-05-31 | 엘지이노텍 주식회사 | 액츄에이터, 이를 포함하는 헤드램프 및 액츄에이터의 제어 방법 |
DE102016223733A1 (de) * | 2016-11-30 | 2018-05-30 | Aktiebolaget Skf | Baueinheit mit wenigstens einem Gehäuseteil und zumindest einem Sensor und Verfahren |
DE112018002306A5 (de) * | 2017-05-04 | 2020-01-23 | Schaeffler Technologies AG & Co. KG | Verfahren zum Befestigen eines Magneten an einer Gewindespindel eines Aktors |
DE102019109977B4 (de) | 2018-05-15 | 2024-03-28 | Schaeffler Technologies AG & Co. KG | Verfahren zur Referenzierung eines Endanschlages eines hydrostatischen Kupplungsaktors |
DE102019206232A1 (de) * | 2019-04-30 | 2020-11-05 | Zf Friedrichshafen Ag | Kupplungsbetätigungseinheit |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2978621A (en) * | 1958-09-16 | 1961-04-04 | Pure Oil Co | Motor |
US3682283A (en) * | 1970-03-02 | 1972-08-08 | Mitumasa Sato | Motor-driven actuator and safety overload mechanism therefor |
US4114747A (en) * | 1976-03-17 | 1978-09-19 | Fritz Eller | Switching bearing assembly for a motor-driven spindle |
FR2496804A1 (fr) * | 1980-12-23 | 1982-06-25 | Knorr Bremse Gmbh | Dispositif de serrage, en particulier pour des freins d'arret, notamment de vehicules sur rails |
US4498350A (en) * | 1982-09-20 | 1985-02-12 | Eaton Corporation | Shifting mechanism |
GB2279125A (en) * | 1993-06-18 | 1994-12-21 | Fichtel & Sachs Ag | Actuating means for a motor vehicle friction clutch has master cylinder operated by electric motor via ball and screw |
US5644951A (en) * | 1991-11-15 | 1997-07-08 | Hatamura; Yotaro | Feed screw apparatus and precise positioning and fine feed system |
-
2010
- 2010-10-26 CN CN201080043889.1A patent/CN102549306B/zh not_active Expired - Fee Related
- 2010-10-26 DE DE112010004249.7T patent/DE112010004249B4/de not_active Expired - Fee Related
- 2010-10-26 WO PCT/DE2010/001249 patent/WO2011050782A1/de active Application Filing
- 2010-10-26 DE DE102010049618A patent/DE102010049618A1/de not_active Withdrawn
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2978621A (en) * | 1958-09-16 | 1961-04-04 | Pure Oil Co | Motor |
US3682283A (en) * | 1970-03-02 | 1972-08-08 | Mitumasa Sato | Motor-driven actuator and safety overload mechanism therefor |
US4114747A (en) * | 1976-03-17 | 1978-09-19 | Fritz Eller | Switching bearing assembly for a motor-driven spindle |
FR2496804A1 (fr) * | 1980-12-23 | 1982-06-25 | Knorr Bremse Gmbh | Dispositif de serrage, en particulier pour des freins d'arret, notamment de vehicules sur rails |
US4498350A (en) * | 1982-09-20 | 1985-02-12 | Eaton Corporation | Shifting mechanism |
US5644951A (en) * | 1991-11-15 | 1997-07-08 | Hatamura; Yotaro | Feed screw apparatus and precise positioning and fine feed system |
GB2279125A (en) * | 1993-06-18 | 1994-12-21 | Fichtel & Sachs Ag | Actuating means for a motor vehicle friction clutch has master cylinder operated by electric motor via ball and screw |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102012220712A1 (de) | 2011-12-08 | 2013-06-13 | Schaeffler Technologies AG & Co. KG | Verfahren zur Steuerung eines Aktors zur Betätigung einer Bremse eines Startergetriebes zum Starten eines Kraftfahrzeugmotors sowie Startergetriebeanordnung |
DE102013218549A1 (de) * | 2013-09-17 | 2015-03-19 | Continental Teves Ag & Co. Ohg | Elektrohydraulischer Aktuator |
Also Published As
Publication number | Publication date |
---|---|
CN102549306A (zh) | 2012-07-04 |
DE102010049618A1 (de) | 2011-05-05 |
CN102549306B (zh) | 2015-07-01 |
DE112010004249B4 (de) | 2019-05-16 |
DE112010004249A5 (de) | 2012-11-29 |
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