EP4066362A1 - Electrically actuatable drive assembly - Google Patents

Electrically actuatable drive assembly

Info

Publication number
EP4066362A1
EP4066362A1 EP20781490.6A EP20781490A EP4066362A1 EP 4066362 A1 EP4066362 A1 EP 4066362A1 EP 20781490 A EP20781490 A EP 20781490A EP 4066362 A1 EP4066362 A1 EP 4066362A1
Authority
EP
European Patent Office
Prior art keywords
holding element
motor shaft
drive unit
unit according
magnetic 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.)
Pending
Application number
EP20781490.6A
Other languages
German (de)
French (fr)
Inventor
Erwin Sinnl
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP4066362A1 publication Critical patent/EP4066362A1/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
    • H02K11/21—Devices for sensing speed or position, or actuated thereby
    • H02K11/215—Magnetic effect devices, e.g. Hall-effect or magneto-resistive elements
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
    • H02K11/21—Devices for sensing speed or position, or actuated thereby
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
    • B60T13/66—Electrical control in fluid-pressure brake systems
    • B60T13/662—Electrical control in fluid-pressure brake systems characterised by specified functions of the control system components
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/74—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
    • B60T17/02—Arrangements of pumps or compressors, or control devices therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
    • B60T8/40—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition comprising an additional fluid circuit including fluid pressurising means for modifying the pressure of the braking fluid, e.g. including wheel driven pumps for detecting a speed condition, or pumps which are controlled by means independent of the braking system
    • B60T8/404—Control of the pump unit
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/003—Couplings; Details of shafts

Definitions

  • the invention relates to an electrically controllable drive unit according to the features of the preamble of claim 1.
  • Such drive units are used, for example, in electronically slip-controllable brake systems of motor vehicles to drive a pressure generator as part of a brake pressure control.
  • the drive units are electrically controlled by an electronic control unit of the brake system.
  • the pressure generator actuated thereby conveys a pressure medium within a brake circuit from a reservoir of the brake system to connected wheel brakes.
  • a brake pressure then builds up in the wheel brakes in proportion to the pressure medium volume conveyed.
  • this brake pressure can be adapted for each wheel to the slip conditions that currently prevail on the respectively assigned wheels of the vehicle. This can prevent spinning wheels and consequently improve the driving stability of a vehicle.
  • braking processes can be carried out independently of the driver depending on the current traffic situation.
  • the volume of pressure medium displaced by the pressure generator represents a decisive parameter in these control and / or regulation processes, which can be determined from the actuation signals of the pressure generator.
  • Existing sensor devices record the angle of rotation of the rotor of the drive unit and transmit the measured angle of rotation signal to the electronic control unit for evaluation.
  • Such sensor devices are constructed from a signal transmitter rotating with the motor shaft and an associated signal receiver which, on the other hand, is arranged in a stationary manner.
  • An electrically controllable drive unit according to the features of the preamble of claim 1 belongs to the prior art and is disclosed, for example, in DE 102017218 648 A1.
  • Such a drive unit 10 is also shown in FIG. 1 of this patent application.
  • This drive unit 10 comprises an electric motor 12 with a rotor 14 that can be driven to rotate and a motor shaft 16 connected to the rotor 14 in a rotationally fixed manner.
  • the rotor 14 is conventionally constructed and has an iron core and several coils wound on it and arranged next to one another in the circumferential direction of the iron core. In a known manner, the coils form magnets in the current-carrying state, which interact with magnets which are fixedly arranged on an opposite inner surface of a housing 18 of the drive unit 10 in such a way that the rotor 14 and motor shaft 16 execute a rotational movement.
  • the motor shaft 16 is rotatably mounted in the housing 18 by means of roller bearings 20, for example.
  • roller bearings 20 for example.
  • several eccentric elements 22 are arranged on the motor shaft 16, for example, in order to actuate devices (not shown) which are arranged transversely to the motor shaft 16.
  • the detail X according to FIG. 1 shows a signal transmitter 24 of a sensor device for electronic detection and evaluation of the angle of rotation of the rotor 14.
  • This signal transmitter 24 is arranged on the end face of the motor shaft 16 facing away from the rotor 14. It has a magnetic element 26 which is fastened indirectly to the motor shaft 16 via a holding element 28.
  • the holding element 28 is cup-shaped and consists of magnetically non-conductive material.
  • a mandrel 30 protrudes from a base of the holding element 28, with which the holding element 28 is pressed into an associated centering bore 32 of the motor shaft 16 and glued therein.
  • a blind hole-like, outwardly open receptacle 34 is formed in which the magnetic element 26 is inserted positively and flush to the outside.
  • the magnetic element 26 is also fixed in this receptacle 34 of the holding element 28 by means of an adhesive connection.
  • the rotor 14 Under operating conditions of this drive unit, the rotor 14 is often greatly accelerated or decelerated.
  • the dynamic, axial and also radial forces occurring in this case load the explained adhesive connections and can lead to the magnetic element 26 of the signal transmitter 24 executing undesired relative movements, in particular axially, with respect to the motor shaft 16.
  • These relative movements lead to inaccuracies in the detection of the covered angle of rotation of the motor shaft 16 and consequently to possible errors in the electrical control of the electric motor 12 of the drive unit 10 or in the regulation of the displaced pressure medium volume. The latter has an undesirable influence on the brake pressure regulation that takes place.
  • An electrically controllable drive unit has the advantage that the attachment of the signal transmitter to the motor shaft does not require adhesive connections. This eliminates elasticities and the rotation angle signal is recorded with greater accuracy. Increasing accuracy is accompanied by an improvement in the electrical controllability of the drive unit and consequently a reduction in possible deviations between an actually conveyed pressure medium volume and a desired setpoint value. Apart from that, the elimination of the adhesive connections simplifies the manufacturing process of the drive unit in a large series and manufacturing time and costs can be saved.
  • a holding element which is designed as a hollow cylinder, in the interior of which the magnetic element of a signal transmitter is received.
  • the hollow cylinder has an open first end with which the holding element, including the magnetic element inserted therein, is fastened to the motor shaft, and a second end opposite thereto with holding element sections which enter the open cross section of the hollow cylinder protrude.
  • the magnetic element of the signal transmitter rests against these retaining element sections and is thereby secured against falling out of the retaining element.
  • a holding element according to the invention can be manufactured inexpensively in a deep-drawing process and receives the magnetic element of the signal transmitter extremely rigidly. As a result, this magnetic element assumes a constant relative position to the assigned signal receiver over the service life and regardless of the loads occurring during operation of the drive unit.
  • the motor shaft advantageously has a section which is reduced in its outer diameter compared to the outer diameter of the motor shaft.
  • the hollow cylindrical holding element is fixed with its open first end on this section.
  • the holding element can be pushed onto this shoulder of the motor shaft in a simple manner and is at the same time centered relative to the longitudinal axis of the motor shaft. It is then firmly connected to the motor shaft by means of a first welded connection.
  • a transition from the shoulder to the circumference of the motor shaft forms a shoulder which serves as an axial stop for the holding element when it is mounted on the motor shaft.
  • the coaxiality of the holding element or the signal transmitter with respect to the longitudinal axis of the motor shaft and the length tolerance of the motor shaft holding element unit can be maintained within relatively narrow limits on the basis of the structural measures explained on the components.
  • the magnetic element of the signal transmitter is held in place by a bracket element within the holding element.
  • the latter is in turn firmly connected to the holding element by a second welded connection.
  • the welded connection increases the deformation resistance of the unit consisting of the holding element, signal transmitter and motor shaft, and the bracket element together with the second welded connection also ensures that the temperature changes occur Fixation of the magnetic element in the holding element.
  • the bracket element also enables a constant air gap to be set between an end face of the motor shaft and the magnetic element. With the air gap, the magnetic flux is directed in the direction of the signal receiver, which benefits the signal strength and facilitates signal detection.
  • the bracket element can be produced inexpensively, for example without cutting.
  • the drawing includes a total of 3 figures, of which
  • Figure 1 shows a drive unit according to the features of the preamble of
  • FIG. 2 shows the detail X according to FIG. 1 in an embodiment according to the invention
  • FIG. 3 shows the signal transmitter according to FIG. 2 without a magnetic element inserted therein in a perspective view.
  • FIG. 2 shows the detail X according to FIG. 1 in an embodiment according to the invention.
  • the motor shaft 16 of a drive unit 10 is shown in the area of its end facing away from a rotor 14 of an electric motor 12 (not shown). According to Figure 2, this end of the motor shaft 16 is equipped with a signal transmitter 24 of a sensor device.
  • the signal transmitter 24 comprises a magnetic element 26 which is fastened to the end face of the motor shaft 16 by means of a holding element 28 made of magnetically non-conductive material.
  • the holding element 28 is designed as a hollow cylinder, inside which the magnetic element 26 is received and firmly anchored by means of a bracket element 36.
  • the hollow cylinder has an open first end, with which it has an outer diameter compared to an outer diameter of the Motor shaft 16 withdrawn paragraph 38 is pushed.
  • a transition from the circumference of the motor shaft 16 to the circumference of the shoulder 38 is designed as a right-angled shoulder 40, for example.
  • the holding element 28 rests on this shoulder 40 with a circumferential, radially protruding collar 42 which is formed at the open end of this holding element 28.
  • the retaining element 28 can be aligned concentrically to a longitudinal axis L of the motor shaft 16 via the shoulder 38 and its shoulder 40 and, after it is initially positively fastened to the motor shaft 16, is additionally connected to this motor shaft 16 by means of a first welded connection 44.
  • This welded connection 44 is formed in FIG. 2 on the basis of an annular, circumferential weld seam, but alternatively a plurality of successive weld points or weld seam sections could also be provided circumferentially.
  • the second end of the holding element 28 opposite the open first end of the holding element 28 and therefore facing away from the motor shaft 16 forms holding element regions 46 which protrude into the open cross section of the hollow cylindrical holding element 28 and extend, for example, across the entire open cross section of the holding element 28 can.
  • the magnetic element 26 of the signal transmitter 24 rests axially on the holding element regions 46 and is therefore mechanically secured against falling out of the interior of the holding element 28.
  • a bracket element 36 is used to axially fix the magnetic element 26 within the holding element 28.
  • the latter is inserted into the holding element 28 under radial prestress and also forms a form-fitting connection with the magnetic element 26.
  • the bracket element 36 is preferably made from a rectangular sheet metal strip and bent into a U-shape. Accordingly, the bracket element 36 has a base 48 which spans the end face of the magnetic element 26 located in the interior of the holding element 28 and also has legs 50 formed at both ends of this base 48 and projecting at right angles therefrom in the same direction. Groove-shaped recesses 52 are formed on the magnetic element 26 on its circumference, which recesses extend in the direction of the longitudinal axis L of the motor shaft 16 starting from the inner end face of the magnetic element 26 until shortly before it extend opposite end face. One of the legs 50 of the bracket element 36 is located in each recess 52.
  • the bracket element 36 is materially connected to the holding element 28 by a second welded connection 54.
  • the weld seam of this second welded connection 54 is designed in a circumferential ring shape, but can alternatively also consist of several weld seam sections following one another in the circumferential direction or of several weld points.
  • the magnetic element 26 of the signal transmitter 24 is thus held between the holding element region 46, which protrudes into the open cross section of the hollow cylindrical holding element 28, and the bracket element 36.
  • FIG. 2 shows the explained holding element 28 again in a perspective illustration.
  • Components or component sections that correspond to one another are provided with the same reference symbols in FIGS. 2 and 3 for the sake of simplicity.
  • the magnetic element of the signal transmitter 24 is not shown in order to be able to better show the design of the holding element 28 and of the bracket element 36.
  • the holding element region 46 protruding into the open cross section of the holding element 28 is designed as a transverse web which extends over the entire opening cross section of the holding element 28 and divides this opening cross section into two separate partial opening cross sections 58.
  • changes or additions to the exemplary embodiment described are conceivable without deviating from the basic concept of the invention according to claim 1 explained at the beginning.

Landscapes

  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Braking Arrangements (AREA)
  • Brushless Motors (AREA)

Abstract

The invention relates to an electrically actuatable drive assembly (10) formed by an electric motor (12) having a rotor (14) that can be driven to perform a rotational movement, and having a motor shaft (16) that is rotationally fixed to the rotor (14) and a signal generator (24) of a sensor device for electronically detecting and evaluating the rotational angle of the motor shaft (16). The signal transmitter (24) is indirectly anchored to the motor shaft (16) via a retaining element (28). The invention proposes a retaining element (28) designed as a hollow cylinder, which has an open first end with which the retaining element (28) is secured on the motor shaft (16) and which has a second end facing away from the motor shaft (16) and having at least one retaining element region (46) projecting into the open cross-section of the retaining element (28).

Description

Offenbarung der Erfindung Disclosure of the invention
Titel: Title:
Elektrisch ansteuerbares Antriebsaggregat Electrically controllable drive unit
Die Erfindung betrifft ein elektrisch ansteuerbares Antriebsaggregat nach den Merkmalen des Oberbegriffs des Anspruchs 1. The invention relates to an electrically controllable drive unit according to the features of the preamble of claim 1.
Derartige Antriebsaggregate werden beispielsweise in elektronisch schlupfregelbaren Bremsanlagen von Kraftfahrzeugen zum Antrieb eines Druckerzeugers im Rahmen einer Bremsdruckregelung verwendet. Eine elektrische Ansteuerung der Antriebsaggregate wird dabei von einem elektronischen Steuergerät der Bremsanlage vorgenommen. Im Falle der elektrischen Ansteuerung des Antriebsaggregats fördert der dadurch betätigte Druckerzeuger ein Druckmittel innerhalb eines Bremskreises von einem Vorratsbehälter der Bremsanlage zu angeschlossenen Radbremsen. Proportional zum geförderten Druckmittelvolumen baut sich in den Radbremsen daraufhin ein Bremsdruck auf. Such drive units are used, for example, in electronically slip-controllable brake systems of motor vehicles to drive a pressure generator as part of a brake pressure control. The drive units are electrically controlled by an electronic control unit of the brake system. In the case of the electrical control of the drive unit, the pressure generator actuated thereby conveys a pressure medium within a brake circuit from a reservoir of the brake system to connected wheel brakes. A brake pressure then builds up in the wheel brakes in proportion to the pressure medium volume conveyed.
Mit Hilfe zusätzlicher vom elektronischen Steuergerät ansteuerbarer Steuereinrichtungen kann dieser Bremsdruck radindividuell an die Schlupfverhältnisse angepasst werden, welche aktuell an den jeweils zugeordneten Rädern des Fahrzeugs vorherrschen. Durchdrehende Räder lassen sich darüber verhindern und folglich die Fahrstabilität eines Fahrzeugs verbessern. Zudem lassen sich Bremsvorgänge in Abhängigkeit der momentanen Verkehrssituation unabhängig vom Fahrer durchführen. With the aid of additional control devices that can be controlled by the electronic control unit, this brake pressure can be adapted for each wheel to the slip conditions that currently prevail on the respectively assigned wheels of the vehicle. This can prevent spinning wheels and consequently improve the driving stability of a vehicle. In addition, braking processes can be carried out independently of the driver depending on the current traffic situation.
Das vom Druckerzeuger verdrängte Volumen an Druckmittel stellt bei diesen Steuer- und/oder Regelungsvorgängen eine maßgebliche Kenngröße dar, welche sich aus den Betätigungssignalen des Druckerzeugers bestimmen lässt. Vorhandene Sensoreinrichtungen erfassen hierfür den Drehwinkel des Rotors des Antriebsaggregats und leiten das gemessene Drehwinkelsignal an das elektronische Steuergerät zur Auswertung weiter. Derartige Sensoreinrichtungen sind aufgebaut aus einem mit der Motorwelle umlaufenden Signalgeber und einem zugeordneten Signalempfänger, welcher demgegenüber ortsfest angeordnet ist. The volume of pressure medium displaced by the pressure generator represents a decisive parameter in these control and / or regulation processes, which can be determined from the actuation signals of the pressure generator. Existing sensor devices record the angle of rotation of the rotor of the drive unit and transmit the measured angle of rotation signal to the electronic control unit for evaluation. Such sensor devices are constructed from a signal transmitter rotating with the motor shaft and an associated signal receiver which, on the other hand, is arranged in a stationary manner.
Stand der Technik State of the art
Ein elektrisch ansteuerbares Antriebsaggregat nach den Merkmalen des Oberbegriffs des Anspruchs 1 gehört zum Stand der Technik und ist beispielsweise in der DE 102017218 648 Al offenbart. An electrically controllable drive unit according to the features of the preamble of claim 1 belongs to the prior art and is disclosed, for example, in DE 102017218 648 A1.
Ein solches Antriebsaggregat 10 ist im Übrigen auch in Figur 1 dieser Patentanmeldung dargestellt. Dieses Antriebsaggregat 10 umfasst einen Elektromotor 12 mit einem zu einer Rotationsbewegung antreibbaren Rotor 14 sowie eine drehfest mit dem Rotor 14 verbundene Motorwelle 16. Der Rotor 14 ist konventionell aufgebaut und weist einen Eisenkern sowie mehrere darauf gewickelte und in Umfangsrichtung des Eisenkerns nebeneinanderliegend angeordnete Spulen auf. In bekannter Art und Weise bilden die Spulen im stromdurchflossenen Zustand Magnete aus, welche mit Magneten, die ortsfest an einer gegenüberliegenden Innenfläche eines Gehäuse 18 des Antriebsaggregats 10 angeordnet sind, derart Zusammenwirken, dass Rotor 14 und Motorwelle 16 eine Rotationsbewegung ausführen. Die Motorwelle 16 ist dazu exemplarisch mittels Wälzlagern 20 im Gehäuse 18 drehbar gelagert. Gemäß Figur 1 sind auf der Motorwelle 16 bespielhaft mehrere Exzenterelemente 22 angeordnet um nicht gezeigte Einrichtungen zu betätigen, die quer zur Motorwelle 16 angeordnet sind. Such a drive unit 10 is also shown in FIG. 1 of this patent application. This drive unit 10 comprises an electric motor 12 with a rotor 14 that can be driven to rotate and a motor shaft 16 connected to the rotor 14 in a rotationally fixed manner. The rotor 14 is conventionally constructed and has an iron core and several coils wound on it and arranged next to one another in the circumferential direction of the iron core. In a known manner, the coils form magnets in the current-carrying state, which interact with magnets which are fixedly arranged on an opposite inner surface of a housing 18 of the drive unit 10 in such a way that the rotor 14 and motor shaft 16 execute a rotational movement. For this purpose, the motor shaft 16 is rotatably mounted in the housing 18 by means of roller bearings 20, for example. According to FIG. 1, several eccentric elements 22 are arranged on the motor shaft 16, for example, in order to actuate devices (not shown) which are arranged transversely to the motor shaft 16.
Das Detail X nach Figur 1 zeigt einen Signalgeber 24 einer Sensoreinrichtung zur elektronischen Erfassung und Auswertung des Drehwinkels des Rotors 14. The detail X according to FIG. 1 shows a signal transmitter 24 of a sensor device for electronic detection and evaluation of the angle of rotation of the rotor 14.
Dieser Signalgeber 24 ist an der vom Rotor 14 abgewandten Stirnfläche der Motorwelle 16 angeordnet. Er weist ein magnetisches Element 26 auf, das mittelbar über ein Haltelement 28 an der Motorwelle 16 befestigt ist. Das Halteelement 28 ist becherförmig ausgebildet und besteht aus magnetisch nichtleitendem Material. Von einem Boden des Haltelements 28 steht ein Dorn 30 ab, mit dem das Haltelement 28 in eine zugeordneten Zentrierbohrung 32 der Motorwelle 16 eingepresst und darin verklebt ist. An der dazu gegenüberliegenden Seite des Haltelements 28 ist eine sacklochartige, nach außen offene Aufnahme 34 ausgebildet, in welcher das magnetische Element 26 formschlüssig und nach außen bündig eingesetzt ist. Eine Fixierung des magnetischen Elements 26 in dieser Aufnahme 34 des Haltelements 28 erfolgt ebenfalls durch eine Klebeverbindung. This signal transmitter 24 is arranged on the end face of the motor shaft 16 facing away from the rotor 14. It has a magnetic element 26 which is fastened indirectly to the motor shaft 16 via a holding element 28. The holding element 28 is cup-shaped and consists of magnetically non-conductive material. A mandrel 30 protrudes from a base of the holding element 28, with which the holding element 28 is pressed into an associated centering bore 32 of the motor shaft 16 and glued therein. On the opposite side of the holding element 28, a blind hole-like, outwardly open receptacle 34 is formed in which the magnetic element 26 is inserted positively and flush to the outside. The magnetic element 26 is also fixed in this receptacle 34 of the holding element 28 by means of an adhesive connection.
Unter Betriebsbedingungen dieses Antriebsaggregats wird der Rotor 14 oftmals stark beschleunigt oder verzögert. Die dabei auftretenden dynamischen, axialen und auch radialen Kräfte belasten die erläuterten Klebeverbindungen und können dazu führen, dass das magnetische Element 26 des Signalgebers 24 unerwünschte Relativbewegungen, insbesondere axial, zur Motorwelle 16 ausführt. Diese Relativbewegungen führen zu Ungenauigkeiten bei der Erfassung des zurückgelegten Drehwinkels der Motorwelle 16 und folglich zu eventuellen Fehlern in der elektrischen Ansteuerung des Elektromotors 12 des Antriebsaggregats 10 bzw. in der Regelung des verdrängten Druckmittelvolumens. Letzteres hat einen unerwünschten Einfluss auf die stattfindende Bremsdruckregelung. Under operating conditions of this drive unit, the rotor 14 is often greatly accelerated or decelerated. The dynamic, axial and also radial forces occurring in this case load the explained adhesive connections and can lead to the magnetic element 26 of the signal transmitter 24 executing undesired relative movements, in particular axially, with respect to the motor shaft 16. These relative movements lead to inaccuracies in the detection of the covered angle of rotation of the motor shaft 16 and consequently to possible errors in the electrical control of the electric motor 12 of the drive unit 10 or in the regulation of the displaced pressure medium volume. The latter has an undesirable influence on the brake pressure regulation that takes place.
Vorteile der Erfindung Advantages of the invention
Ein elektrisch ansteuerbares Antriebsaggregat nach den Merkmalen des Anspruchs 1 weist demgegenüber den Vorteil auf, dass die Befestigung des Signalgebers an der Motorwelle ohne Klebeverbindungen auskommt. Damit werden Elastizitäten eliminiert und die Erfassung des Drehwinkelsignals erfolgt mit höherer Genauigkeit. Mit steigender Genauigkeit geht eine Verbesserung der elektrischen Ansteuerbarkeit des Antriebsaggregats einher und folglich eine Verringerung eventueller Abweichungen zwischen einem tatsächlich geförderten Druckmittelvolumen und einem gewünschten Sollwert. Davon abgesehen vereinfacht sich durch einen Entfall der Klebeverbindungen der Herstellprozess des Antriebsaggregats in einer Großserie und Fertigungszeit sowie -kosten können eingespart werden. An electrically controllable drive unit according to the features of claim 1 has the advantage that the attachment of the signal transmitter to the motor shaft does not require adhesive connections. This eliminates elasticities and the rotation angle signal is recorded with greater accuracy. Increasing accuracy is accompanied by an improvement in the electrical controllability of the drive unit and consequently a reduction in possible deviations between an actually conveyed pressure medium volume and a desired setpoint value. Apart from that, the elimination of the adhesive connections simplifies the manufacturing process of the drive unit in a large series and manufacturing time and costs can be saved.
Erfindungsgemäß werden diese Vorteile durch ein Haltelement erreicht, das als Hohlzylinder ausgeführt ist, in dessen Innerem das magnetische Element eines Signalgebers aufgenommen ist. Der Hohlzylinder weist ein offenes erstes Ende auf, mit dem das Haltelement inklusive des darin eingesetzten magnetischen Elements an der Motorwelle befestigt ist sowie ein dazu gegenüberliegendes, zweites Ende mit Halteelementabschnitten, welche in den offenen Querschnitt des Hohlzylinders hineinragen. An diesen Halteelementabschnitten liegt das magnetische Element des Signalgebers an und ist dadurch gegen ein Herausfallen aus dem Haltelement gesichert. According to the invention, these advantages are achieved by a holding element which is designed as a hollow cylinder, in the interior of which the magnetic element of a signal transmitter is received. The hollow cylinder has an open first end with which the holding element, including the magnetic element inserted therein, is fastened to the motor shaft, and a second end opposite thereto with holding element sections which enter the open cross section of the hollow cylinder protrude. The magnetic element of the signal transmitter rests against these retaining element sections and is thereby secured against falling out of the retaining element.
Ein erfindungsgemäßes Haltelement lässt sich in einem Tiefziehverfahren kostengünstig hersteilen und nimmt das magnetische Element des Signalgebers äußerst starr auf. Dadurch nimmt dieses magnetische Element über die Lebensdauer und unabhängig von den auftretenden Belastungen während eines Betriebs des Antriebsaggregats eine konstante Relativposition zum zugeordneten Signalempfänger ein. A holding element according to the invention can be manufactured inexpensively in a deep-drawing process and receives the magnetic element of the signal transmitter extremely rigidly. As a result, this magnetic element assumes a constant relative position to the assigned signal receiver over the service life and regardless of the loads occurring during operation of the drive unit.
Weitere Vorteile und vorteilhafte Weiterbildungen der Erfindung ergeben sich aus den Unteransprüchen und/oder aus der nachfolgenden Beschreibung. Further advantages and advantageous developments of the invention emerge from the subclaims and / or from the following description.
Vorteilhafterweise weist die Motorwelle an ihrem dem Halteelement zugewandten Ende einen Abschnitt auf, welcher in seinem Außendurchmesser gegenüber dem Außendurchmesser der Motorwelle zurückgenommenen ist. An diesem Abschnitt ist das hohlzylindrische Haltelement mit seinem offenen ersten Ende fixiert. Das Haltelement lässt sich auf einfache Art und Weise auf diesen Absatz der Motorwelle aufschieben und wird dabei gleichzeitig relativ zur Längsachse der Motorwelle zentriert. Anschließend wird es mittels einer ersten Schweißverbindung stoffschlüssig mit der Motorwelle verbunden. Ein Übergang vom Absatz zum Umfang der Motorwelle bildet eine Schulter aus, welche dem Haltelement als Axialanschlag bei dessen Montage auf die Motorwelle dient.At its end facing the holding element, the motor shaft advantageously has a section which is reduced in its outer diameter compared to the outer diameter of the motor shaft. The hollow cylindrical holding element is fixed with its open first end on this section. The holding element can be pushed onto this shoulder of the motor shaft in a simple manner and is at the same time centered relative to the longitudinal axis of the motor shaft. It is then firmly connected to the motor shaft by means of a first welded connection. A transition from the shoulder to the circumference of the motor shaft forms a shoulder which serves as an axial stop for the holding element when it is mounted on the motor shaft.
Die Koaxialität des Haltelements bzw. des Signalgebers gegenüber der Längsachse der Motorwelle sowie die Längentoleranz der Motorwelle- Haltelement- Einheit kann anhand der erläuterten konstruktive Maßnahmen an den Bauteilen in relativ engen Grenzen eingehalten werden. The coaxiality of the holding element or the signal transmitter with respect to the longitudinal axis of the motor shaft and the length tolerance of the motor shaft holding element unit can be maintained within relatively narrow limits on the basis of the structural measures explained on the components.
In einer weiter vorteilhaften Ausbildung der Erfindung ist das magnetische Element des Signalgebers durch ein Bügelelement innerhalb des Halteelements ortsfest gehalten. Letzteres ist seinerseits durch eine zweite Schweißverbindung stoffschlüssig mit dem Halteelement verbunden. Die Schweißverbindung steigert die Verformungsfestigkeit der Einheit aus Haltelement, Signalgeber und Motorwelle und zudem gewährleistet das Bügelelement zusammen mit der zweiten Schweißverbindung selbst bei auftretenden Temperaturänderungen die Fixierung des magnetischen Elements im Haltelement. Das Bügelelement ermöglicht darüber hinaus die Einstellung eines konstanten Luftspalts zwischen einer Stirnfläche der Motorwelle und dem magnetischen Element. Mit dem Luftspalt wird der Magnetfluss in Richtung des Signalempfängers gelenkt, was der Signalstärke zugutekommt bzw. die Signalerfassung begünstigt. In a further advantageous embodiment of the invention, the magnetic element of the signal transmitter is held in place by a bracket element within the holding element. The latter is in turn firmly connected to the holding element by a second welded connection. The welded connection increases the deformation resistance of the unit consisting of the holding element, signal transmitter and motor shaft, and the bracket element together with the second welded connection also ensures that the temperature changes occur Fixation of the magnetic element in the holding element. The bracket element also enables a constant air gap to be set between an end face of the motor shaft and the magnetic element. With the air gap, the magnetic flux is directed in the direction of the signal receiver, which benefits the signal strength and facilitates signal detection.
Das Bügelelement ist kostengünstig, beispielsweise spanlos, produzierbar. The bracket element can be produced inexpensively, for example without cutting.
Zeichnung drawing
Ein Ausführungsbeispiel der Erfindung ist anhand der Zeichnung veranschaulicht und wird in nachfolgender Beschreibung detailliert erläutert. An exemplary embodiment of the invention is illustrated with the aid of the drawing and is explained in detail in the following description.
Die Zeichnung umfasst insgesamt 3 Figuren, von denen The drawing includes a total of 3 figures, of which
Figur 1 ein Antriebsaggregat nach den Merkmalen des Oberbegriffs desFigure 1 shows a drive unit according to the features of the preamble of
Anspruchs 1 zeigt; Claim 1 shows;
Figur 2 das Detail X nach Figur 1 in erfindungsgemäßer Ausführung darstellt und FIG. 2 shows the detail X according to FIG. 1 in an embodiment according to the invention and
Figur 3 den Signalgeber nach Figur 2 ohne darin eingesetztes magnetisches Element in perspektivischer Ansicht zeigt. FIG. 3 shows the signal transmitter according to FIG. 2 without a magnetic element inserted therein in a perspective view.
Beschreibung der Figuren Description of the figures
Figur 2 zeigt das Detail X nach Figur 1 in einer erfindungsgemäßen Ausgestaltung. Dargestellt ist die Motorwelle 16 eines Antriebsaggregats 10 im Bereich ihres von einem Rotor 14 eines Elektromotors 12 (nicht gezeigt) abgewandten Endes. Gemäß Figur 2 ist dieses Ende der Motorwelle 16 mit einem Signalgeber 24 einer Sensoreinrichtung bestückt. FIG. 2 shows the detail X according to FIG. 1 in an embodiment according to the invention. The motor shaft 16 of a drive unit 10 is shown in the area of its end facing away from a rotor 14 of an electric motor 12 (not shown). According to Figure 2, this end of the motor shaft 16 is equipped with a signal transmitter 24 of a sensor device.
Der Signalgeber 24 umfasst, wie bekannt, ein magnetisches Element 26, das mittels eines Halteelements 28 aus magnetisch nicht-leitendem Material an der Stirnseite der Motorwelle 16 befestigt ist. Das Haltelement 28 ist erfindungsgemäß als Hohlzylinder ausgeführt in dessen Innerem das magnetische Element 26 aufgenommen und mittels eines Bügelelements 36 fest verankert ist. Der Hohlzylinder weist ein offenes erstes Ende auf, mit dem er auf einen in seinem Außendurchmesser gegenüber einem Außendurchmesser der Motorwelle 16 zurückgenommenen Absatz 38 aufgeschoben ist. Ein Übergang vom Umfang der Motorwelle 16 zum Umfang des Absatzes 38 ist exemplarisch als rechtwinklige Schulter 40 ausgebildet. An dieser Schulter 40 liegt das Haltelement 28 mit einem umlaufenden, radial abstehenden Bund 42, welcher am offenen Ende dieses Haltelements 28 ausgebildet ist, an. Das Haltelement 28 ist über den Absatz 38 und dessen Schulter 40 konzentrisch zu einer Längsachse L der Motorwelle 16 ausrichtbar und wird nach seiner zunächst formschlüssigen Befestigung an der Motorwelle 16 mittels einer ersten Schweißverbindung 44 zusätzlich stoffschlüssig mit dieser Motorwelle 16 verbunden. Diese Schweißverbindung 44 ist in Figur 2 anhand einer ringförmig umlaufenden Schweißnaht ausgebildet, alternativ könnten jedoch auch umlaufend mehrere aufeinanderfolgende Schweißpunkte oder Schweißnahtabschnitte vorgesehen werden. As is known, the signal transmitter 24 comprises a magnetic element 26 which is fastened to the end face of the motor shaft 16 by means of a holding element 28 made of magnetically non-conductive material. According to the invention, the holding element 28 is designed as a hollow cylinder, inside which the magnetic element 26 is received and firmly anchored by means of a bracket element 36. The hollow cylinder has an open first end, with which it has an outer diameter compared to an outer diameter of the Motor shaft 16 withdrawn paragraph 38 is pushed. A transition from the circumference of the motor shaft 16 to the circumference of the shoulder 38 is designed as a right-angled shoulder 40, for example. The holding element 28 rests on this shoulder 40 with a circumferential, radially protruding collar 42 which is formed at the open end of this holding element 28. The retaining element 28 can be aligned concentrically to a longitudinal axis L of the motor shaft 16 via the shoulder 38 and its shoulder 40 and, after it is initially positively fastened to the motor shaft 16, is additionally connected to this motor shaft 16 by means of a first welded connection 44. This welded connection 44 is formed in FIG. 2 on the basis of an annular, circumferential weld seam, but alternatively a plurality of successive weld points or weld seam sections could also be provided circumferentially.
Das dem offenen ersten Ende des Haltelements 28 gegenüberliegende und demnach von der Motorwelle 16 abgewandt liegende zweite Ende des Haltelements 28 bildet Halteelementbereiche 46 aus, welche in den offenen Querschnitt des hohlzylindrischen Haltelements 28 hineinragen und sich beispielsweise quer über den gesamten offenen Querschnitt des Haltelements 28 erstrecken können. An den Haltelementbereichen 46 liegt das magnetische Element 26 des Signalgebers 24 axial an und ist demnach mechanisch gegen ein Herausfallen aus dem Inneren des Haltelements 28 gesichert. The second end of the holding element 28 opposite the open first end of the holding element 28 and therefore facing away from the motor shaft 16 forms holding element regions 46 which protrude into the open cross section of the hollow cylindrical holding element 28 and extend, for example, across the entire open cross section of the holding element 28 can. The magnetic element 26 of the signal transmitter 24 rests axially on the holding element regions 46 and is therefore mechanically secured against falling out of the interior of the holding element 28.
Zu einer axialen Fixierung des magnetischen Elements 26 innerhalb des Haltelements 28 dient ein Bügelelement 36. Letzteres ist unter radialer Vorspannung in das Haltelement 28 eingesetzt und geht mit dem magnetischen Element 26 zudem eine formschlüssige Verbindung ein. A bracket element 36 is used to axially fix the magnetic element 26 within the holding element 28. The latter is inserted into the holding element 28 under radial prestress and also forms a form-fitting connection with the magnetic element 26.
Das Bügelelement 36 ist bevorzugt aus einem rechteckigen Blechstreifen hergestellt und u-förmig gebogen. Dementsprechend weist das Bügelelement 36 eine Basis 48 auf, welche die im Inneren des Halteelements 28 liegende Stirnfläche des magnetischen Elements 26 überspannt und weist darüber hinaus an beiden Enden dieser Basis 48 ausgebildete und rechtwinklig davon in dieselbe Richtung abstehende Schenkel 50 auf. Am magnetischen Element 26 sind an dessen Umfang nutförmige Ausnehmungen 52 ausgebildet, welche sich in Richtung der Längsachse L der Motorwelle 16 ausgehend von der innenliegenden Stirnfläche des magnetischen Elements 26 bis kurz vor dessen gegenüberliegende Stirnfläche erstrecken. In einer jeden Ausnehmung 52 liegt einer der Schenkel 50 des Bügelelements 36 ein. The bracket element 36 is preferably made from a rectangular sheet metal strip and bent into a U-shape. Accordingly, the bracket element 36 has a base 48 which spans the end face of the magnetic element 26 located in the interior of the holding element 28 and also has legs 50 formed at both ends of this base 48 and projecting at right angles therefrom in the same direction. Groove-shaped recesses 52 are formed on the magnetic element 26 on its circumference, which recesses extend in the direction of the longitudinal axis L of the motor shaft 16 starting from the inner end face of the magnetic element 26 until shortly before it extend opposite end face. One of the legs 50 of the bracket element 36 is located in each recess 52.
Das Bügelelement 36 ist mit dem Halteelement 28 stoffschlüssig durch eine zweite Schweißverbindung 54 verbunden. Die Schweißnaht dieser zweiten Schweißverbindung 54 ist gemäß der Figur 2 umlaufend ringförmig ausgestaltet, kann alternativ aber auch aus mehreren in Umfangsrichtung aufeinanderfolgenden Schweißnahtabschnitten oder aus mehreren Schweißpunkten bestehen. Das magnetische Element 26 des Signalgebers 24 ist somit zwischen dem Haltelementbereich 46, welcher in den offenen Querschnitt des hohlzylindrischen Halteelements 28 hineinragt und dem Bügelelement 36 gehalten. The bracket element 36 is materially connected to the holding element 28 by a second welded connection 54. According to FIG. 2, the weld seam of this second welded connection 54 is designed in a circumferential ring shape, but can alternatively also consist of several weld seam sections following one another in the circumferential direction or of several weld points. The magnetic element 26 of the signal transmitter 24 is thus held between the holding element region 46, which protrudes into the open cross section of the hollow cylindrical holding element 28, and the bracket element 36.
Zwischen der im Inneren des Haltelements 28 gelegenen Stirnfläche des magnetischen Elements 26 und einer zugewandten Stirnfläche der Motorwelle 16 besteht ein axialer Abstand und damit ein Luftspalt 56, welcher eine Beeinflussung des magnetischen Flusses des magnetischen Elements 26 durch die Motorwelle 16 zumindest weitgehend ausschließt. Between the end face of the magnetic element 26 located inside the holding element 28 and a facing end face of the motor shaft 16, there is an axial distance and thus an air gap 56, which at least largely excludes the motor shaft 16 from influencing the magnetic flux of the magnetic element 26.
Figur 2 zeigt das erläuterte Haltelement 28 nochmals in einer perspektivischen Darstellung. Einander entsprechende Bauteile oder Bauteilabschnitte sind in den Figuren 2 und 3 der Einfachheit halber mit denselben Bezugszeichen versehen.FIG. 2 shows the explained holding element 28 again in a perspective illustration. Components or component sections that correspond to one another are provided with the same reference symbols in FIGS. 2 and 3 for the sake of simplicity.
In der Figur 3 ist allerdings das magnetische Element des Signalgebers 24 nicht gezeigt um die Ausbildung des Haltelements 28 sowie des Bügelelements 36 besser zeigen zu können. In FIG. 3, however, the magnetic element of the signal transmitter 24 is not shown in order to be able to better show the design of the holding element 28 and of the bracket element 36.
Der in den offenen Querschnitt des Haltelements 28 hineinragende Haltelementbereich 46 ist bei diesem Ausführungsbeispiel als Quersteg ausgebildet, welcher sich über den gesamten Öffnungsquerschnitt des Haltelements 28 erstreckt und diesen Öffnungsquerschnitt in zwei voneinander getrennte Teilöffnungsquerschnitte 58 unterteilt. Prinzipiell ist es denkbar mehrere solcher Querstege vorzusehen und den Öffnungsquerschnitt des Haltelements 28 in weitere Teilöffnungsquerschnitte zu unterteilen. Selbstverständlich sind Änderungen oder Ergänzungen am beschriebenen Ausführungsbeispiel denkbar, ohne vom eingangs erläuterten Grundgedanken der Erfindung nach Anspruch 1 abzuweichen. In this exemplary embodiment, the holding element region 46 protruding into the open cross section of the holding element 28 is designed as a transverse web which extends over the entire opening cross section of the holding element 28 and divides this opening cross section into two separate partial opening cross sections 58. In principle, it is conceivable to provide a plurality of such transverse webs and to subdivide the opening cross section of the holding element 28 into further partial opening cross sections. Of course, changes or additions to the exemplary embodiment described are conceivable without deviating from the basic concept of the invention according to claim 1 explained at the beginning.

Claims

Ansprüche Expectations
1. Elektrisch ansteuerbares Antriebsaggregat (10) mit einem Elektromotor (12), insbesondere mit einem elektronisch kommutierten Elektromotor, der einen zu einer Rotationsbewegung antreibbaren Rotor (14) und eine drehtest mit dem Rotor (14) verbundene Motorwelle (16) aufweist und mit einem an der Motorwelle (16) angeordneten Signalgeber (24) einer Sensoreinrichtung zur elektronischen Erfassung und Auswertung des Drehwinkels der Motorwelle (16), welcher ein Halteelement (28) sowie ein am Halteelement (28) angeordnetes magnetisches Element (26) umfasst, dadurch gekennzeichnet, dass das Haltelement (28) als Hohlzylinder ausgeführt ist, in dessen Innerem das magnetisches Element (26) gehalten ist, wobei das Haltelement (28) ein offenes erstes Ende aufweist mit dem das Haltelement (28) mit dem magnetischen Element (26) an der Motorwelle (16) befestigt ist und wobei das Haltelement (28) ein von der Motorwelle (16) abgewandt liegendes zweites Ende mit wenigstens einem in den offenen Querschnitt des Haltelements (28) hineinragenden Haltelementbereich (46) aufweist, an welchem das magnetische Element (26) anliegt. 1. Electrically controllable drive unit (10) with an electric motor (12), in particular with an electronically commutated electric motor, which has a rotor (14) that can be driven to a rotational movement and a motor shaft (16) connected to the rotor (14) and connected to a on the motor shaft (16) arranged signal transmitter (24) of a sensor device for electronic detection and evaluation of the angle of rotation of the motor shaft (16), which comprises a holding element (28) and a magnetic element (26) arranged on the holding element (28), characterized in that, that the holding element (28) is designed as a hollow cylinder, in the interior of which the magnetic element (26) is held, wherein the holding element (28) has an open first end with which the holding element (28) with the magnetic element (26) on the Motor shaft (16) is attached and wherein the holding element (28) has a second end facing away from the motor shaft (16) with at least one end in the open cross section t of the holding element (28) has holding element region (46) which protrudes and against which the magnetic element (26) rests.
2. Antriebsaggregat nach Anspruch 1, dadurch gekennzeichnet, dass die Motorwelle (16), an ihrem dem Halteelement (28) zugewandten Ende, einen in seinem Außendurchmesser gegenüber einem Außendurchmesser der Motorwelle (16) zurückgenommenen Absatz (38) aufweist, an dem der Signalgeber (24) mit dem offenen Ende seines Haltelements (28) befestigt ist. 2. Drive unit according to claim 1, characterized in that the motor shaft (16), at its end facing the holding element (28), has a shoulder (38) with its outer diameter relative to an outer diameter of the motor shaft (16), on which the signal transmitter (24) is attached to the open end of its holding element (28).
3. Antriebsaggregat nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass ein Übergang vom Absatz (38) der Motorwelle (16) zum Umfang der Motorwelle (16) eine Schulter (40) ausbildet, an welcher das Haltelement (28) anliegt. 3. Drive unit according to claim 1 or 2, characterized in that a transition from the shoulder (38) of the motor shaft (16) to the circumference of the motor shaft (16) forms a shoulder (40) on which the holding element (28) rests.
4. Antriebsaggregat nach einem der Ansprüche 1 bis 32, dadurch gekennzeichnet, dass das magnetische Element (26) des Signalgebers (24) mittels eines Bügelelements (36) im Inneren des Haltelements (28) befestigt ist, wobei dieses Bügelelement (36) eine den Querschnitt des magnetischen Elements (26) überspannende Basis (48) sowie mit der Basis (48) verbundene Schenkel (50) aufweist, welche sich am Umfang des magnetischen Elements (26) in Richtung einer Längsachse L der Motorwelle (16) erstrecken. 4. Drive unit according to one of claims 1 to 32, characterized in that the magnetic element (26) of the signal transmitter (24) is fastened by means of a bracket element (36) inside the holding element (28), this bracket element (36) having a Cross section of the magnetic element (26) spanning base (48) and with the base (48) connected legs (50) which extend on the circumference of the magnetic element (26) in the direction of a longitudinal axis L of the motor shaft (16).
5. Antriebsaggregat nach Anspruch 4, dadurch gekennzeichnet, dass das Bügelelement (36) mit dem Haltelement (28) stoffschlüssig verbunden ist, insbesondere durch eine erste Schweißverbindung (44), welche sich wenigstens abschnittsweise in Umfangsrichtung des Haltelements (28) erstreckt. 5. Drive unit according to claim 4, characterized in that the bracket element (36) is integrally connected to the holding element (28), in particular by a first welded connection (44) which extends at least in sections in the circumferential direction of the holding element (28).
6. Antriebsaggregat nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass das Haltelement (28) mit der Motorwelle (16) stoffschlüssig verbunden ist, insbesondere durch eine zweite Schweißverbindung (54), welche sich wenigstens abschnittsweise in Umfangsrichtung des Haltelements (28) erstreckt. 6. Drive unit according to one of claims 1 to 5, characterized in that the holding element (28) is materially connected to the motor shaft (16), in particular by a second welded connection (54) which extends at least in sections in the circumferential direction of the holding element (28) extends.
7. Antriebsaggregat nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass der Halteelementbereich (46) des Halteelements (28) als Quersteg ausgebildet ist, welcher den offenen Querschnitt des Haltelements (28) in mehrere Teilöffnungsquerschnitte (58) unterteilt. 7. Drive unit according to one of claims 1 to 6, characterized in that the holding element region (46) of the holding element (28) is designed as a transverse web which divides the open cross section of the holding element (28) into several partial opening cross-sections (58).
8. Antriebsaggregat nach einem der Ansprüche 4 bis 7, dadurch gekennzeichnet, dass das magnetische Element (26) des Signalgebers (24) zwischen dem Halteelementbereich (46) des Halteelements (28) und der Basis (48) des Bügelelements (36) festgelegt ist. 8. Drive unit according to one of claims 4 to 7, characterized in that the magnetic element (26) of the signal transmitter (24) is fixed between the holding element region (46) of the holding element (28) and the base (48) of the bracket element (36) .
9. Antriebsaggregat nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass eine Erstreckung des Haltelements (28) und eine Erstreckung des magnetischen Elements (24) jeweils in Richtung einer Längsachse L der Motorwelle (16) derart aufeinander abgestimmt sind, dass in dem auf die Motorwelle (16) montierten Zustand des Signalgebers (24) zwischen der Stirnfläche der Motorwelle (16) und der dieser Motorwelle (10) zugewandten Stirnfläche des magnetischen Elements (24) ein Luftspalt (56) besteht. 9. Drive unit according to one of claims 1 to 8, characterized in that an extension of the holding element (28) and an extension of the magnetic element (24) are each coordinated in the direction of a longitudinal axis L of the motor shaft (16) such that in the When the signal transmitter (24) is mounted on the motor shaft (16), there is an air gap (56) between the end face of the motor shaft (16) and the end face of the magnetic element (24) facing this motor shaft (10).
EP20781490.6A 2019-11-28 2020-09-28 Electrically actuatable drive assembly Pending EP4066362A1 (en)

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DE102017218648A1 (en) 2017-10-19 2019-04-25 Robert Bosch Gmbh Drive unit, in particular hydraulic unit of an electronically slip-controllable vehicle brake system

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WO2021104717A1 (en) 2021-06-03
US20230006519A1 (en) 2023-01-05
DE102019218441A1 (en) 2021-06-02

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