CN112953111A

CN112953111A - Driven element of an electric motor drive unit and method for producing the same

Info

Publication number: CN112953111A
Application number: CN202011347188.9A
Authority: CN
Inventors: A·克鲁格; J·T·乔蒂; R·德切博雷尔
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2019-11-26
Filing date: 2020-11-26
Publication date: 2021-06-11
Also published as: DE102019218246A1

Abstract

The invention relates to a driven element (10) of an electric drive unit (80), in particular in a motor vehicle, and to a method for producing such a driven element (10), and to an electric drive unit (80) comprising the driven element (10), wherein the driven element (10) has a driven pinion (12) made of metal, wherein the driven pinion (12) has a toothing (30) for transmitting torque, wherein the driven pinion (12) has a flange region (32), wherein the flange region (32) is directly encapsulated, at least in some regions, by a signal transmitter element (40), wherein the signal transmitter element (40) has a magnetic material in combination with a synthetic material.

Description

Driven element of an electric motor drive unit and method for producing the same

Technical Field

The invention relates to a driven element and to an electric motor-type drive unit comprising such a driven element and to a method for producing such a driven element according to the type of the independent claims.

Background

DE 102019203482 a1, which is published subsequently by the applicant, discloses an electric machine with a driven element for transmitting torque to a transmission. The driven element comprises a driven pinion made of metal and having a toothed section, which has a flange-shaped, radially encircling rim that is surrounded by a sintered component, which is designed as a magnetic wheel for the sensor device. The requirement for the driven pinion to be made of metal arises from the robustness or wear resistance of the transmission drive. In this case, a form-locking connection is produced between the driven pinion and the magnet wheel by a special design of the driven pinion, wherein the production of the driven element with the magnet wheel and the driven pinion as sintered components is very complicated and subject to large production tolerances. However, in order to accurately detect the rotational position, it is necessary to: the dimensions of the magnetic wheel are positioned very precisely with respect to the corresponding sensor unit. On the one hand, therefore, the production of such a driven element should be simplified, wherein at the same time the positioning of the magnet wheel relative to the driven pinion should be improved.

Disclosure of Invention

In contrast, the driven element according to the invention and the electric-motor-type drive unit comprising such a driven element and the method for producing a driven element according to the type of the independent claims have the following advantages: by injecting the magnetic material in combination with the synthetic material directly at the flange region of the metallic driven pinion, the assembly of an additional intermediate sleeve made of brass material is dispensed with. Since the sensor magnet wheel is made of a magnetic material in combination with a synthetic material, it has a significantly smaller weight than a sintered magnet wheel. By means of synthetic material injection molding, the sensor magnet wheel can be positioned dimensionally very exactly with respect to the driven pinion, so that the rotational position detection of the rotor can be more reliable and more accurate.

Advantageous refinements and improvements of the features specified in the independent claims result from the measures mentioned in the dependent claims. Particularly advantageous are: sintered driven pinions made of metal can be produced at significantly lower costs than driven pinions made in a cut-out manner. On the other hand, the inexpensive and lightweight magnetic material of the sensor magnet wheel, combined with the synthetic material, enables a very good connection to the sintered component of the driven pinion in the injection molding tool. In this case, a polymer is preferably used as the synthetic material, into which individual particles of hard ferrite are incorporated. The magnetic material can then be magnetized accordingly in order to form a strong permanent magnet pole at the sensor wheel over the entire life span.

In this way, the sensor magnet wheel cannot be released from the driven pinion even under extreme conditions of use, the flange region of the driven pinion forming a form-fit with the magnetic material in combination with the synthetic material. The projections extend in one piece radially and/or axially from the flange region, wherein the magnetic material bonded to the synthetic material is then inserted between the projections in a form-fitting manner. The sensor magnet wheel can thereby be connected to the flange region in a form-fitting manner both with respect to the circumferential direction and with respect to the axial direction without additional manufacturing effort. This ensures that the sensor magnet wheel remains securely positioned on the driven pinion over the entire life and cannot become loose.

If the form-locking element is designed as an axially and/or radially open pocket, the magnetic material combined with the synthetic material can easily penetrate into the pocket during injection molding without interference due to capillary effects. The pockets can be formed, for example, on the axial side of the flange region. In order to ensure sufficient mechanical stability of the pockets, the pockets are configured axially upward and axially downward, respectively, in an alternating manner at all times in the circumferential direction. Such pocket-like recesses can advantageously be produced by a sintering process of the driven pinion and are more mechanically stable in particular than radial teeth running continuously in the axial direction. This enables the axial construction height of the connection flange to be reduced.

As an alternative, the form-locking element can also be designed as a groove and a radial toothing alternately over the circumferential extent, which groove and radial toothing extend in particular over the entire axial extent of the flange region. In this case, the slots or radial teeth can be precisely aligned in the axial direction of the driven pinion or can be formed obliquely in the circumferential direction.

The driven pinion has a central bore in the axial direction, by means of which the driven element can be pushed onto the shaft. In this case, the bore can be designed as a continuous axial opening, so that the shaft penetrates the driven pinion completely in the axial direction. A flange region having a larger outer diameter than the external teeth portion is formed adjacent to the external teeth portion at an axial end portion of the driven pinion. A magnet wheel is injected onto the flange region and extends radially outward from an outer edge of the flange region. Particularly advantageous are: in the radially outer region of the magnet wheel, a sleeve-shaped projection is formed, which extends away from the toothing of the driven pinion and projects in particular axially beyond the metallic driven pinion. The sleeve-shaped projection is particularly suitable for interacting radially with the sensor element, so that the axial installation space axially above the driven element can be reduced.

In a preferred embodiment of the invention, a cylindrical region is formed axially between the flange region and the toothing, said cylindrical region having a smaller outer diameter than the outer diameter of the flange region. Such a cylindrical region can additionally also be formed axially on the side of the flange region facing away from the toothing. Such a cylindrical region, which in particular also has a larger outer diameter than the toothing, can be used to seal the injection molding tool radially against the circumferential surface of the cylindrical region. The injection molding tool therefore does not have to bear axially sealingly against the axial side of the flange region. Thus, the flange region can be arranged inside the injection molding die without it contacting the inner wall of the injection molding die. This has the following advantages: as a result, manufacturing tolerances in the production of the driven pinion as a sintered component can be compensated for by the axially variable positioning of the flange region within the injection molding tool.

In such embodiments, the magnetic material combined with the synthetic material then bears axially against two opposite axial sides of the flange region and extends radially as far as the circumference of the cylindrical region. The flange region is therefore completely surrounded on both axial sides by the material of the magnet wheel, whereby the magnet wheel is particularly firmly connected to the flange region and thus simultaneously forms an axial form-fit with the flange region. The magnet wheel thereby tapers radially inward from the disk-shaped section into a fork-shaped region in order to completely surround the flange region of the driven pinion.

In order to position the sensor magnet wheel on the rotor shaft in an axially precise manner, an axial end face of the tooth, which faces away from the sensor magnet wheel in the axial direction, is particularly advantageously used as a reference surface. The reference surface is positioned on the rotor shaft, for example, in the axial direction, precisely in a defined manner relative to a predefined axial stop. The axial distance between the axial end face of the toothing and the axially outer side of the sensor magnet wheel facing the toothing can now be precisely predefined to a specific dimension. For this purpose, the teeth are pressed into precisely manufactured axial recesses in the injection molding tool, so that the inner wall of the injection molding tool, which forms the axially outer surface of the sensor magnet wheel, always forms a very precisely predefined dimension. By having the injection molding die seal radially with respect to the cylinder region and not seal axially with respect to the flange region, the exact position of the flange region inside the injection molding die is no longer important for the precise positioning of the sensor magnet wheel. More precisely, the manufacturing tolerances of the driven pinion can be compensated for in the following manner: the axial distance between the inner wall of the injection molding die and the axial side of the flange region can be changed accordingly. The variable distance then corresponds to the axial wall thickness of the sensor magnet wheel in the region of its fork.

In an alternative embodiment of the driven element, a deformation region is formed over the entire circumference on the axial side of the flange region, which deformation region bears directly in an axially sealing manner against the inner wall of the injection molding tool. In order to always position the sensor magnet wheel precisely in the axial direction in this embodiment relative to the flange region of the driven pinion, the axial manufacturing tolerances of the flange region are compensated for by the axial pressing of the deformation region by means of the injection molding tool. This ensures that the injection molding tool always bears reliably in an axially sealing manner against the two opposite axial sides of the flange region. In this embodiment, the material of the magnet wheel substantially rests only at the radially outer region of the flange region and not at both axial sides of the flange region. In this embodiment, for example, the exact axial position of the sensor magnet wheel can also be precisely predefined relative to the end face of the driven pinion facing away from the toothing. The deformation region is formed here axially as an annular circumferential projection, and the cross section of the projection can be formed here with a rounded tip in a nose-like manner, in order to achieve, on the one hand, a good seal against the inner wall of the injection molding tool and, on the other hand, a sufficient deformation by the contact pressure of the tool parts.

In order to form a defined radial surface for the sensor magnet wheel on exactly one axial side of the flange region, an axial annular projection is preferably formed only on the axial side of the flange region opposite the axial end faces of the teeth.

The driven element according to the invention can be particularly advantageously installed in an electric-motor-type drive unit, which preferably has an electric motor. In this case, the driven element is inserted axially at the free end into the rotor shaft of the electric motor, so that the sensor magnet wheel is arranged axially in a precisely defined position. The magnetized magnetic pole of the sensor magnet interacts with a sensor device, which is a component of an electronics unit of the electric motor. The detected rotor position can preferably be used for electronic commutation of the stator coils of the electric motor. In this case, for example, the magnetic sensor can extend directly from a printed circuit board arranged axially above the driven element as a finger into the axial region of the sleeve-shaped projection of the sensor magnet wheel. If the sensor is arranged radially opposite the sleeve-shaped projection, the axial installation space between the driven element and the electronics unit can thereby be reduced.

The toothing of the driven pinion extends from the sensor magnet wheel axially away from the latter and preferably engages in a corresponding gear element of the gear, which is preferably flanged axially to the motor housing. The torque of the electric motor is transmitted via the gear mechanism, in particular, to a pump, which is a component of a hydraulic system in the motor vehicle. The driven pinion preferably drives a brake booster which, for example, also has an ABS system, i.e. an anti-lock brake system, or an ESP system, i.e. a vehicle body stability control system, in a motor vehicle.

The method for producing a driven element according to the invention has the following advantages: the axially variable arrangement of the flange region in the interior of the injection molding tool enables very precise and well reproducible production of very precise defined dimensions as the distance between the axial end face of the tooth and the axial outer face of the sensor magnet wheel facing the tooth. The axial end faces of the teeth are pressed into precisely manufactured axial recesses in the injection molding tool by means of an axial pressing force, so that the specified dimension is always specified by the precisely manufactured axial depth of the axial recesses. Since the two axial sides of the flange region do not abut against the inner side of the injection molding tool, the magnetic material combined with the synthetic material can be injected in each case in the axial region between the axial sides of the flange region and the opposing axial inner wall of the injection molding tool. The injection mould is preferably composed of two halves separated by a radially extending partition surface. In this case, the axial recess for the precise production of the toothing is formed only at one of the two parts of the injection molding tool, so that the circumferential regions of the two cylindrical regions are not contacted by the separating surfaces of the two tool parts.

In an alternative production method for the driven element, two opposite axial sides of the flange region are pressed axially between two axial tool halves. The axial contact pressure of the two tool halves is so great that the annular axial projection formed at the axial side of the flange region is deformed to such an extent that the two tool parts always bear sealingly against one another at their radial separating surfaces. This ensures that a very precise axial clearance in the interior of the die is always set independently of the precise axial dimension of the flange region. The axial position of the sensor magnet wheel can thereby always be adjusted very precisely relative to the axial side of the flange region opposite the annular axial projection.

Drawings

Further features of the invention emerge from the further embodiments of the description and the figures as they are described in the following examples of the invention. Wherein:

figure 1 shows a section through a driven element according to the invention;

fig. 2 and 3 show two different variants of a driven pinion as an insert for the driven element according to fig. 1;

FIG. 4 shows an injection molding die with a driven pinion gear already inserted;

fig. 5 shows a driven element produced by means of the injection molding tool according to fig. 4;

fig. 6 shows a further variant of a driven pinion for insertion into an injection-moulding mould; and is

Fig. 7 shows the drive unit with the driven element already installed.

Detailed Description

Fig. 1 shows a driven element 10 for an electrical drive unit 80, as the electrical drive unit 80 is, for example, a component of a brake booster in a motor vehicle. The driven element 10 has a driven pinion 12, which driven pinion 12 is made of metal and is preferably designed as a sintered component. The output pinion 12 has a through-opening 44 in the axial direction 8, by means of which through-opening 44 the output element 10 can be connected to the rotor shaft 84 of the electric drive unit 80. In the axially downward region, the driven pinion 12 has a toothing 30, which toothing 30 is preferably designed as helical toothing. In the axially upper region opposite the toothing 30, a flange region 32 is formed on the driven pinion 12, which flange region 32 has a larger outer diameter than the toothing 30. A sensor magnet wheel 41 is arranged as a signal transmitter element 40 at the flange region 32, which sensor magnet wheel 41 extends radially 7 outward beyond the flange region 32. The sensor magnet wheel 41 is made of a hard ferrite bonded polymer in this embodiment, which can be injected directly onto the flange region 32 by means of injection molding. Alternatively, other magnetic materials in combination with synthetic materials can also be considered for the sensor magnet wheel 41. The sensor magnet wheel 41 has a disk-shaped section 46, which disk-shaped section 46 extends in the radial direction 7. At a radially outer edge 47 of the disk-shaped section 46, a sleeve-shaped section 42 is formed, which sleeve-shaped section 42 extends in the axial direction 8 coaxially with the through-opening 44, away from the tooth 30. In this case, the sleeve-shaped section 42 projects axially beyond the upper end 33 of the flange region 32. In the left half of the figure, the flange region 32 has a constant outer diameter 31 over its entire axial extent from the toothing 30 up to the upper end 33. On the right, a variant of a flange region 30 is shown, which flange region 30 has a reduced outer diameter 31 at its upper end 33 and/or toward the toothing 30. A form-locking element 34 is formed at the flange region 32, into which form-locking element 34 the magnetic material of the magnetic sensor wheel 41, which is combined with the synthetic material, is embedded in a form-locking manner. The sensor magnet wheel 41 is thereby securely and torsionally fixed to the driven pinion 12. In this embodiment, the axially outer face 50 of the sensor magnet wheel 41 extends in the same radial plane 51 as the axial side face 53 of the flange region 32. Such a driven element 10 can preferably be produced in the following manner: the driven pinion 12 as an insert rests axially with the axial side 53 of the flange region 32 against an axial inner wall 94 of the injection molding tool 90.

Fig. 2 and 3 show two different embodiments of the driven pinion 12, as the driven pinion 12 is, for example, in fig. 1, encapsulated by the sensor magnet wheel 41. In fig. 2, the form-locking element 34 is formed at the radially outer edge 29 of the flange region 32. The form-locking element 34 extends as a groove 35 in the axial direction 8, wherein the groove 35 extends, for example, in the circumferential direction 9 in a direction inclined to the axial direction 8. Between the grooves 35, radial teeth 37 are formed by shaping the grooves 35, which radial teeth 37 form a positive lock with the grooves 35 with respect to the circumferential direction 9. The inclination of the grooves 35 and the radial teeth 37 also forms a positive lock in the axial direction 8. In the embodiment according to fig. 2, the groove 35 and the radial toothing 37 extend over the entire axial extension of the flange region 32. The toothing 30 is connected in the axial direction directly to the flange region 32 at the axial end face 53 of the flange region 32.

In fig. 3, the form-locking element 34 is designed as an axially open pocket 36, into which pocket 36 the material of the signal transmitter element 40 is inserted in a form-locking manner. For example, pocket-shaped recesses 36 are formed at both axial sides 53 of the flange region 32. The pocket-like recesses 36 are preferably formed in the circumferential direction 9 alternately at the upper and lower axial side 53 of the flange region 32. The pocket 36, which is open in the axial direction and in particular also in the radial direction, in turn forms a form-locking connection with respect to the circumferential direction 9 and the axial direction 8.

Fig. 4 shows a driven pinion 12 for an alternative embodiment of a driven element 10, which has been inserted into an injection molding die 90. In this case, column regions 38 are formed axially on both sides of the flange region 32, which column regions 38 have a smaller outer diameter than the outer diameter 31 of the flange region 32. The driven pinion 12 here also does not rest directly with the side 53 of the flange region 32 against the inner wall 94 of the injection molding tool 90. Rather, the two opposite side faces 53 of the flange region 32 have an axial distance 70 from the inner side 94, so that the flange region 32 is supported virtually floating in the injection molding tool 90. The injection mold 90 has two

axial parts

91, 92, which

parts

91, 92 are each sealed radially with respect to the cylindrical region 38. In this case, the distance 52 between the axial end face 54 of the toothing 30 and the axial outer face 50 of the sensor magnet wheel 41 at the flange region 32 is predefined to a defined dimension. Here, manufacturing tolerances of the driven pinion 12 are compensated for by the variable adjustment of the distance 70 between the inner wall 94 and the axial side 53 of the flange region 32. The inner wall 94 is dimensioned for the axially outer surface 50 of the sensor magnet wheel 41, the axially outer surface 50 of the sensor magnet wheel 41 then having a precisely defined distance 52 from the axial end face 54 of the tooth 30. In order to adjust the axial distance 52, the driven pinion 12 is pressed axially by means of a pressing force 74 into an axial projection 72 for the toothing 30, which axial projection 72 is formed outside the injection region of the injection mold 90. The material of the signal transmitter element 40 is then injected into the injection molding die 90.

In fig. 5, the driven element 10 is now shown, as the driven element 10 is produced according to the method of fig. 4. The disk-shaped section 46 of the sensor magnet wheel 41 extends radially inward to the two cylinder regions 38 and rests sealingly against the two cylinder regions 38. In this case, the disk-shaped section 46 surrounds the flange region 32 with the fork-shaped region 43. The material of the sensor magnet wheel 41 thereby bears axially against the two axial sides 53 of the flange region 32. The axial outer face 50 of the sensor magnet wheel 41 facing the toothing 30 has a distance 70 with respect to the axial side 53 facing the toothing 30. The distance 52 between the axial end face 54 of the toothing 30 and the axially outer face 50 of the sensor magnet wheel 41 also corresponds to the distance 76 between the axial end face 54 of the toothing 30 and an axial underside 77 of the sleeve-shaped region 42, which underside 77 likewise lies in the plane 51. The axial position of the sleeve-shaped region 42 is thus precisely predefined by the distance 52, which is necessary for precise interaction with the respective magnetic sensor 110. In fig. 5, a form-locking element 34 can additionally be formed at the radially outer edge 29, which form-locking element 34 forms a form-locking, in particular in the circumferential direction 9.

Fig. 6 shows a further variant of the driven pinion 12, in which driven pinion 12 an annular axial projection 60 is formed coaxially with the through opening 44 at the axial side 53 above the flange region 32. The projection is formed in cross section with a curved nose 61. The flange region 32 of the driven pinion 12 is clamped axially between two

parts

91, 92 of the injection molding tool 90, the two

parts

91, 92 being only schematically illustrated in fig. 6. In this case, the annular bead 60 can be pressed in the axial direction 8 by a corresponding closing force 96 of the injection mold 90 to such an extent that the axial manufacturing tolerances of the flange region 32 can be compensated for according to an axial standard dimension 99 of the injection mold 90. In this embodiment, the axial side 53 of the flange region 32 facing the toothing 30 again lies in the same radial plane 51 as the axial outer face 50 of the sensor magnet wheel 41. In this case, the material of the sensor magnet wheel 41 does not rest axially on the axial side 53 of the flange region 32, but on the radially outer edge 29 of the flange region 32. At the outer edge 29, a form-locking element 34 can be formed in turn, which form-locking element 34 forms a form-locking in particular with respect to the axial direction 8 and/or the circumferential direction 9.

Fig. 7 shows an electrical drive unit 80, which electrical drive unit 80 is designed as an electric motor 81. The electric motor 81 is designed as a brushless, electronically commutated electric motor 81 and has a stator 14 arranged in the motor housing 13. At the stator 14, stator coils 18 are arranged on inwardly directed stator teeth, which stator coils 18 interact with a rotor 22 that is rotatably mounted about a rotational axis 20. Permanent magnets 24 are fixed to rotor 22, rotor 22 being rotated by the temporally successive energization of the individual stator coils 18 of stator 14. The rotor 22 has a rotor shaft 84, which is arranged, for example, in two bearing

arrangements

26, 28 spaced apart from one another in the axial direction. The second bearing device 28 is arranged, for example, at the closed bottom face 15 of the motor housing 13. The first bearing device 26 is accommodated at a bearing cap 27, which bearing cap 27 is arranged axially opposite the bottom face 15. The free end of the rotor shaft 84 penetrates the bearing cover 15 and the first bearing device 26 and projects into the axially open region 11 of the motor housing 13. The driven element 10 is connected in a rotationally fixed manner at the free end of the rotor shaft 84. The driven element 10 with the driven pinion 12 and the signal transmitter element 40 is thereby arranged above the bearing cap 27 in the axially open region 11. An electronic unit, not shown, having a magnetic sensor 110, which is only schematically shown in fig. 7, is inserted into the axially open region 11. The magnetic sensor 110 is connected, for example, directly to an electronic printed circuit board and is arranged, in particular, radially relative to the sleeve-shaped section 42 of the sensor magnet wheel 41. The sleeve-shaped section 41 is magnetized in such a way that a plurality of north and south poles 48 are alternately formed distributed over the circumference. The sleeve-shaped section 42 is preferably magnetized in the radial direction. The magnetic sensor 110 can then detect the rotational position of the rotor 22, for example, to control electronic commutation of the stator coil 18. A flange 16 is formed at the axially open region 11, with which flange 16 the electric motor 81 can be flanged to the gear housing. In this case, the toothing 30 of the output pinion 12 engages in a corresponding gear element in order to actuate, for example, a hydraulic pump of a brake booster. The brake booster is preferably a component of a brake system in a motor vehicle, which brake system is used at least indirectly to generate a braking force at a wheel of the vehicle.

It should be noted that various combinations of the individual features with one another are possible with regard to the exemplary embodiments shown in the figures and the description. Thus, the material used for the sintered component and the magnetic material used for the drive unit 80 in combination with the synthetic material can be varied. The specific shaping of the teeth 30 and of the sensor magnet wheel 41 can likewise be varied accordingly. The mechanical connection of the driven pinion 12 to the sensor magnet wheel 41 is particularly suitable for the following drive units 80: in the case of the drive unit 80, the driven member and the electronics unit are arranged on the same axial side of the rotor 22, and in particular the electronics circuit board extends transversely to the rotor shaft 84. The drive unit 80 according to the invention is particularly suitable as an embodiment of an electronically commutated motor for adjusting a movable assembly or for a rotary drive in a motor vehicle. Here, such an electric motor 81 according to the invention can be used particularly advantageously in external areas, such as, for example, in motor chambers, where the electric motor 81 is subjected to extreme weather conditions and vibrations.

Claims

1. A driven element (10) of an electric drive unit (80), in particular in a motor vehicle, having a driven pinion (12) made of metal, the driven pinion (12) having a toothing (30) for transmitting a torque, wherein the driven pinion (12) has a flange region (32), the flange region (32) being at least partially encapsulated by a signal transmitter element (40) in a direct manner, the signal transmitter element (40) having a magnetic material in combination with a synthetic material.

2. The driven element (10) as claimed in claim 1, characterized in that the driven pinion (12) with the flange region (32) is designed as a metallic sintered component and the signal transmitter element (40) is designed as a sensor magnet wheel (41) made of hard ferrite bonded to a polymer.

3. The driven element (10) according to claim 1 or 2, characterized in that a form-locking element (34) is formed at the flange region (32), the magnetic material combined with the synthetic material being inserted into the form-locking element (34) in a form-locking manner, wherein the form-locking element (34) extends in a radial direction (7) and/or in an axial direction (8) and in particular forms a form-locking with respect to the circumferential direction (9) and/or the axial direction (8).

4. The driven element (10) according to one of the preceding claims, characterized in that an axially open pocket-shaped recess (36) is formed in the flange region (32), which recess (36) is filled with the magnetic material combined with the synthetic material for forming a form-locking connection, wherein in particular the recesses (36) alternate in the circumferential direction (9) at an upper side (53) and a lower side (53) of the flange region (32).

5. The driven element (10) according to one of the preceding claims, characterized in that the driven pinion (12) has an axial through-opening (44) for receiving a rotor shaft (84), and the flange region (32) extends in the radial direction (7) at an axial end of the driven pinion (12), and the sensor magnet wheel (41) extends in the radial direction (7) from the flange region (32) in a disk-shaped manner, wherein a sleeve-shaped section (42) is formed in one piece, in particular at a radially outer edge (47) of the sensor magnet wheel (41), the sleeve-shaped section (42) extending in the axial direction (8) away from the toothing (30).

6. The driven element (10) according to any one of the preceding claims, characterized in that a cylindrical region (38) is formed at both sides of the flange region (53) with respect to the axial direction (8), respectively, the cylindrical region (38) having a smaller diameter than the outer diameter (31) of the flange region (32), and the magnetic material in combination with synthetic material abuts radially at both cylindrical regions (38).

7. The driven element (10) according to one of the preceding claims, characterized in that a disk-shaped part (46) of the sensor magnet wheel (41) surrounds the flange region (32) in a radially (7) fork-shaped manner and axially on both sides of the flange region (32), the sensor magnet wheel (41) being configured with an axially outer face (50) in each case at the flange region (32).

8. Driven element (10) according to one of the preceding claims, characterized in that a defined, specified dimension is predefined for an axial distance (52) from an axial end face (54) of the toothing (30) to an axial outer face (50) of the sensor magnet wheel (41) facing the toothing (30), wherein tolerance compensation of the driven pinion (12) is compensated by means of a variable axial distance (70) between the axial outer face (50) and an axial side face (53) of the flange region (32).

9. The driven element (10) according to any one of the preceding claims, characterized in that an annular projection in the form of a nose (60) is formed axially (8) at the flange region (32) at least at one axial side (53), which annular projection is axially deformable when inserted into an injection molding die (90) in order to compensate for axial manufacturing tolerances of the flange region (32).

10. The driven element (10) as claimed in one of the preceding claims, characterized in that the annular nose (60) is formed exclusively on the side (53) of the flange region (32) facing away from the toothing (30) and is designed as a closed, circumferential ring, and in particular the annular nose (60) has a curved nose (61).

11. Drive unit (80) with a driven element (10) according to one of the preceding claims, characterized in that the driven element (10) is arranged on a rotor shaft (84) of an electric motor (81), wherein the sensor magnet wheel (41) interacts with a sensor device (110) for detecting a rotational position of the rotor (22), the sensor device (110) being used in particular for electronic commutation of a stator coil (18) of an electronically commutated motor.

12. Drive unit (80) having a driven element (10) according to one of the preceding claims, characterized in that the toothing (30) of the driven element (10) engages in a corresponding gear element of a pump and in particular drives an eccentric pump of a hydraulic system for a brake force machine, preferably having an ABS function, i.e. a brake anti-lock function, and/or an ESP function, i.e. a body stability control function.

13. Method for manufacturing a driven element (10) according to one of the preceding claims, characterized in that a previously manufactured driven pinion (12) with a flange region (32) is arranged inside an injection molding die (90) in the following manner: the flange region (32) is mounted in a floating manner in relation to the axial direction (8) within the injection molding tool (90) such that the flange region (32) does not contact an inner wall (94) of the injection molding tool (90), but rather the injection molding tool (90) is sealed radially with respect to a cylindrical region (38) of the driven pinion (12).

14. Method for producing a driven element (10) according to claim 13, characterized in that the toothing (30) protrudes axially from the injection molding tool (90) to such an extent that a predetermined axial distance (52) between an axial end face (54) of the toothing (30) and an axial inner side (94) of the injection molding tool (90) in the region of the flange region (32) is set before the signal transmitter element (40) is injected into the flange region (32) by means of a magnetic material in combination with a synthetic material.

15. Method for producing a driven element (10) according to one of claims 1 to 12, characterized in that a flange region (32) of a previously produced driven pinion (12) is clamped axially between inner walls (94) of the injection molding tool (90), wherein the inner walls (94) of the injection molding tool (90) press together an annular nose (60) formed axially at the flange region (32) axially until the injection molding tool (90) is completely sealed axially, wherein in particular two parts (91, 92) of the injection molding tool (90) bear axially sealingly against the flange region (32) axially from two sides, respectively.