Drive unit for actuation device of brake system, actuation device

Abstract

The invention relates to a drive unit (13) for an actuating device (1) of a brake system (2), comprising: a motor housing (14); an electric motor (22) arranged in the motor housing (14), a rotor (24) of the electric motor (22) being arranged in a rotationally fixed manner on a motor shaft (25) rotatably mounted in the motor housing (14); the motor shaft (25) is connected or can be connected to an actuator (3) of the actuating device (1), the planetary transmission (28) has a rotatably mounted planet carrier (30), and the planet carrier (30) has a support section (31) on which at least one planet gear (32) is rotatably mounted. According to the invention, the drive unit (13) has a support plate (36) arranged on the motor housing (14), by means of which the planet carrier (30) is supported on the side of the planet gear (32) facing away from the electric machine (22).

Description

Technical Field

[0001] The present invention relates to a drive unit for an operating device of a brake system, the drive unit comprising: a motor housing; an electric motor arranged in the motor housing, wherein a rotor of the electric motor is arranged non-rotatably relative to a motor shaft rotatably supported in the motor housing; and a planetary transmission mechanism, via which the motor shaft is connected or connectable to an actuator of the operating device, wherein the planetary transmission mechanism has a rotatably supported planet carrier, and wherein the planet carrier has a bearing section, on which at least one planet gear is rotatably supported.

[0002] The invention further relates to an actuating device for a brake system, comprising an actuator and a drive unit for driving the actuator. Background Art

[0003] Drive units of the type mentioned above are known in the prior art. With the increasing degree of electrification of motor vehicles, the operating devices of the brake systems are also becoming increasingly electrified. For this purpose, the operating device has a drive unit with an electric motor arranged in a motor housing. Here, the rotor of the electric motor is arranged non-rotatably on a motor shaft rotatably supported in the motor housing. In order to achieve high torques, a planetary transmission is usually located downstream of the motor shaft, so that the motor shaft is connected or can be connected to the actuator of the operating device via the planetary transmission. Usually, the planetary transmission has a rotatably supported planet carrier with a bearing section, on which at least one planet gear is rotatably supported. Summary of the invention

[0004] The drive unit according to the invention with the features of claim 1 has the advantage that the installation of the drive unit in the actuating device is simplified compared to previously known solutions. To this end, it is provided according to the invention that the drive unit has a bearing plate arranged on the motor housing, by which the planet carrier is supported on the side of the planetary gears facing away from the motor. The bearing plate arranged on the motor housing supports the planet carrier so that the motor and the planetary gear can be handled together as a pre-assembled part. Therefore, the planetary gear does not have to be connected to the motor, more precisely the motor shaft, in terms of transmission technology during the final assembly of the actuating device. The reduction in the assembly work associated with the final assembly ultimately leads to a reduction in the manufacturing costs of the actuating device. Since the bearing plate supports the planet carrier on the side of at least one planetary gear facing away from the motor, a particularly reliable holding of the planet carrier on the bearing plate and therefore on the motor housing is achieved. This is preferably supported by the fact that the part of the rotary bearing that can rotate with the planet carrier forms an axial stop for the bearing section. Preferably, the bearing plate is fixed to the motor housing, for example, by one or more fixing means. Preferably, a plurality of planetary gears are rotatably mounted on the carrier section, wherein the bearing cover then supports the planet carrier on the side of the plurality of planetary gears facing away from the electric machine. Particularly preferably, at least three planetary gears are rotatably mounted on the carrier section.

[0005] According to a preferred embodiment, the support plate carries a rolling bearing for supporting the planet carrier. This enables a low-friction support of the planet carrier. In addition, the position of the planet carrier can be defined particularly accurately by the rolling bearing.

[0006] According to a preferred embodiment, it is provided that the bearing plate abuts the motor housing radially on the inside. The bearing plate is thus arranged at least partially in the motor housing and is thus designed to save structural space. In addition, the radial abutment allows the bearing plate to be mechanically firmly fixed to the motor housing. Preferably, the bearing plate is pressed into the motor housing and is thus fixed to the motor housing by an interference fit. Alternatively, the bearing plate is fixed to the motor housing, for example, by an adhesive connection or by a welded connection.

[0007] According to a preferred embodiment, it is provided that the bearing guard bears axially against the motor housing flange of the motor housing. By configuring the drive unit in this way, a particularly precise definition of the position of the planet carrier can be achieved due to a minimized tolerance chain. This will be explained in more detail below. In particular, the bearing guard has a bearing guard flange, wherein the bearing guard flange bears axially against the motor housing flange with reference to the axis of rotation of the planet carrier.

[0008] According to a preferred embodiment, the planet carrier has an output shaft and the bearing plate supports the output shaft. Since the bearing plate supports the output shaft, i.e., a shaft-shaped or shaft-like element with a relatively small diameter, a rotary bearing with a small diameter can also be used. This leads to a further reduction in the manufacturing costs of the drive unit or the actuating device.

[0009] According to a preferred embodiment, the load-bearing section is arranged in the motor housing and the driven shaft protrudes from the motor housing. By arranging the load-bearing section in the motor housing, the drive unit is designed to be compact and saves construction space. Since the driven shaft protrudes from the motor housing, the coupling of the driven shaft to another transmission element in terms of transmission technology can be easily realized.

[0010] According to a preferred embodiment, the support plate supports a first bearing point of the planet carrier, and the planet carrier has a second bearing point, which is arranged on the side of the first bearing point facing away from the motor and is spaced apart from the first bearing point. By providing two bearing points spaced apart from each other, an accurate support of the planet carrier can be achieved. In particular, during the operation of the drive unit, at least the transverse forces introduced into the planetary transmission are reduced. In the case of a correct assembly of the drive unit and a correct design of the elements supporting the bearing point, the introduction of transverse forces into the planetary transmission can even be effectively avoided. Preferably, the driven shaft has at least a second bearing point, particularly preferably a first bearing point and a second bearing point. Preferably, the planet carrier or the driven shaft has a driven toothing between the bearing points.

[0011] According to a preferred embodiment, the drive unit has a further bearing cover which is arranged between the planetary gear and the electric motor and supports the motor shaft. In addition to the bearing cover which supports the planet carrier, there is also the further bearing cover which supports the motor shaft. The position of the motor shaft can be precisely defined by the further bearing cover. Preferably, the bearing section of the planet carrier is arranged between the bearing cover and the further bearing cover.

[0012] The actuating device according to the invention having the features of claim 9 is characterized by a drive unit designed according to the invention. This also results in the advantages already mentioned. Further preferred features and combinations of features are apparent from the above description and claims.

[0013] According to a preferred embodiment, the operating device has a transmission housing fixed to the motor housing, and the second bearing point of the planet carrier is supported by the transmission housing. By supporting the first bearing point and the second bearing point of the planet carrier, it is effectively avoided that transverse forces are introduced into the planetary transmission during the operation of the operating device.

[0014] According to a preferred embodiment, the transmission housing carries a rolling bearing for supporting the planet carrier. The rolling bearing enables a low-friction support of the planet carrier in the transmission housing. In addition, the position of the second bearing point of the planet carrier can be defined particularly accurately by the rolling bearing. Particularly preferably, the rolling bearing is designed as a needle bearing.

[0015] According to an alternative embodiment, it is preferably provided that the transmission housing has a bearing pin fixed relative to the housing, which engages in a recess on the end side of the planet carrier to support the planet carrier. This embodiment of the actuating device is advantageous for the production costs of the actuating device, since relatively expensive rolling bearings can be saved. Preferably, the bearing pin forms a sliding bearing for the planet carrier.

[0016] According to a preferred embodiment, the motor housing flange of the motor housing has a plurality of first fixing channels, the transmission housing flange of the transmission housing has a plurality of second fixing channels, each of the first fixing channels is aligned with another of the second fixing channels, and the transmission housing is fixed to the motor housing by fixing means inserted into the fixing channels. In this way, a particularly mechanically stable fixing of the motor housing to the transmission housing can be achieved. As described above, the bearing guard preferably abuts the motor housing radially inwardly. In this embodiment, the transmission housing flange preferably abuts the motor housing flange directly axially. As described above, the bearing guard can also abut the motor housing flange axially. The bearing guard, more precisely the bearing guard flange of the bearing guard, is preferably arranged between the motor housing flange and the transmission housing flange. Particularly preferably, the bearing guard, more precisely the bearing guard flange, has a plurality of third fixing channels, each of the third fixing channels is aligned with one of the first fixing channels and one of the second fixing channels. At this time, the fixing means is also inserted into the third fixing channel. Preferably, the fixing means is configured as a screw.

[0017] Particularly preferably, the fixing means is designed as a pass screw. The pass screw is a threaded element having a first axial section and a second axial section, wherein the first axial section has a thread and wherein the second axial section is designed as a guide section. Preferably, the pass screw is designed such that the guide section is arranged in the fixing channel at least substantially without radial play. In addition to the mechanically stable fixing of the motor housing to the transmission housing, the pass screw also enables an exact orientation of the motor housing relative to the transmission housing. This means that the desired orientation of the planet carrier can also be achieved accurately. For example, it can be achieved that the axis of rotation of the planet carrier is oriented parallel to the axis of rotation of the motor shaft. The advantage of this axially parallel orientation is that the transverse forces introduced into the planetary transmission are particularly effectively reduced. As described above, according to a preferred embodiment, the support guard is axially against the motor housing flange. If a pass screw is used as the fixing means, the support guard will also be accurately oriented by the pass screw. This is accompanied by a particularly precise definition of the position of the planet carrier, since the tolerance chain is minimized by direct alignment of the bearing shroud with the bolts by means of the recessed holes.

[0018] According to a preferred embodiment, the motor housing flange has a plurality of first orientation channels, the transmission housing flange has a plurality of second orientation channels, each of the first orientation channels is aligned with another of the second orientation channels, and the orientation channels are not occupied. The orientation channels are not occupied, so that when assembling the operating device, no fixing means or the like are arranged in the orientation channels. Therefore, the orientation channels are occupied by no fixing means. In this respect, the orientation channels do not contribute to fixing the transmission housing at the motor housing. However, the orientation channels provide advantages with respect to the assembly of the operating device. For example, when assembling the operating device, the drive unit is first provided and arranged at the transmission housing, so that the motor housing flange is arranged relative to the transmission housing flange. Then, the desired orientation of the motor housing relative to the transmission housing is achieved by inserting the positioning pins through each pair of orientation channels. Then, the transmission housing and the motor housing are fixed to each other, for example, by inserting the fixing means into the above-mentioned fixing channels. However, the fixing can also be achieved in other ways, so that the presence of the orientation channel does not necessarily require the presence of the fixing channel. Since the orientation of the transmission housing relative to the motor housing is fixed by the fixing means at this time, the positioning pins are preferably removed next. The advantages explained above in connection with the bolts for the reaming holes can be achieved by means of the orientation channels. As described above, according to a preferred embodiment, the support guard is axially in contact with the motor housing flange. In this embodiment, the support guard preferably has a plurality of third orientation channels, wherein each of the third orientation channels is aligned with one of the first orientation channels and one of the second orientation channels, respectively. If the locating pins are inserted into the orientation channels, the support guard is now also precisely oriented by the locating pins. As described above, this is accompanied by a particularly precise definition of the position of the planet carrier due to the minimization of the tolerance chain. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be explained in more detail below with reference to the accompanying drawings, wherein:

[0020] Figure 1 A cross-sectional view showing an operating device of a brake system;

[0021] Figure 2 A detailed perspective view of the manipulator is shown;

[0022] Figure 3 A cross-sectional view showing a drive unit of the operating device; and

[0023] Figure 4 A drive unit according to another embodiment is shown. DETAILED DESCRIPTION

[0024] Figure 1 A sectional view of an actuating device 1 for a brake system 2 (not shown in detail) of a motor vehicle is shown.

[0025] The operating device 1 has a movably supported pressure element 3, more precisely an actuator 3, which in the present case is designed as a push rod 3. The actuator 3 can be moved in a first direction 4 and in a second direction 5 opposite to the first direction 4. The actuator 3 is at least partially arranged in a housing 6 of the operating device 1. The master brake cylinder 7 of the operating device 1 is arranged fixedly on the housing 6 relative to the housing. A first hydraulic piston 8 and a second hydraulic piston 9 are movably supported in the master brake cylinder 7, that is, movably supported in the first direction 4 and the second direction 5. The master brake cylinder 7 has a plurality of hydraulic couplings 10, 11. If the operating device 1 is designed as intended in the brake system 2, the hydraulic couplings 10, 11 are fluidically connected to the slave cylinders of the friction brake device of the brake system 2. In this case, the friction brake device can be actuated by moving the hydraulic pistons 8 and 9 in the first direction 4. The actuator 3 is coupled to the hydraulic pistons 8 and 9 so that the hydraulic pistons 8, 9 can be moved in the first direction 4 by the actuator 3. Therefore, the friction brake device can be actuated by moving the actuator 3.

[0026] The operating device 1 also has a transmission housing 12. The housing 6 and the transmission housing 12 are fixed to each other. In the present case, the transmission housing 12 is designed in the form of a shell.

[0027] The operating device 1 also has a drive unit 13. The drive unit 13 has a motor housing 14. The motor housing 14 is fixed to the transmission mechanism housing 12. This will be referred to below. Figure 2 Explain in more detail. Figure 2 For this purpose, a detailed perspective view of the operating device 1 is shown. Figure 2 As shown, the motor housing 14 has a motor housing flange 15, and the transmission housing 12 has a transmission housing flange 16. The mounting surface of the motor housing flange 15 is arranged opposite to the mounting surface of the transmission housing 12. The motor housing flange 15 is fixed to the transmission housing flange 16 by a plurality of fixing means 17, wherein the fixing means 17 is configured as a screw member 17 in the present case. The fixing means 17 are respectively inserted into a first fixing channel 18 of the motor housing flange 15 and a second fixing channel 19 of the transmission housing flange 16. Figure 3 One of the fixing means 17 can be seen by way of example in FIG.

[0028] The motor housing flange 15 also has a plurality of first orientation channels 20. The transmission housing flange 16 has a plurality of second orientation channels 21, wherein each of the first orientation channels 20 is aligned with another of the second orientation channels 21. Figure 2As shown, when the operating device 1 is assembled, the orientation channels 20 and 21 are not occupied, or more precisely, are not occupied by fixing means. Therefore, the orientation channels 20 and 21 do not contribute to fixing the transmission housing 12 on the motor housing 14. However, the orientation channels 20 and 21 bring advantages when assembling the operating device 1, as will be explained in more detail later.

[0029] Refer to the following Figure 3 The embodiment of the drive unit 13 is explained in more detail. The drive unit 13 has an electric motor 22 arranged in a motor housing 14. The stator 23 of the electric motor 22 is arranged fixedly relative to the housing in the motor housing 14. The rotor 24 of the electric motor 22 is arranged on a motor shaft 25 in a rotationally fixed manner. The motor shaft 25 is rotatably supported in the motor housing 14 about an axis of rotation 26.

[0030] The motor shaft 25 is coupled to the actuator 3 via a transmission 27, so that the actuator 3 can be moved by the motor 22. The transmission 27 has a planetary transmission 28, which can be driven or rotated by the motor shaft 25. For this purpose, the sun gear 29 of the planetary transmission 28 is arranged on the motor shaft 25 in a non-rotatable manner. The planetary transmission 28 also has a rotatably supported planet carrier 30. The axis of rotation of the planet carrier 30 corresponds to the axis of rotation 26 of the motor shaft 25. The planet carrier 30 has a plate-shaped bearing section 31, and a plurality of planetary gears 32 are rotatably supported at the bearing section. In the present case, three planetary gears 32 are rotatably supported at the bearing section 31. The bearing section 31 is arranged in the motor housing 14. The planet carrier 30 also has a driven shaft 33, which is arranged on the side of the bearing section 31 facing away from the motor 22 and is non-rotatably connected to the bearing section 31. With reference to the rotation axis of the planet carrier 30 , the driven shaft 33 protrudes axially from the motor housing 14 .

[0031] The planet carrier 30 has a first bearing location 34 and a second bearing location 35. The first bearing location 34 is arranged adjacent to the bearing section 31 on the side of the planetary gear 32 facing away from the electric motor 22. The second bearing location 35 is arranged on the side of the first bearing location 34 facing away from the electric motor 22 and is spaced apart from the first bearing location 34. In the present case, the driven shaft 33 has the bearing locations 34 and 35, so that the planet carrier 30 is supported by supporting the driven shaft 33.

[0032] The first bearing point 34 is supported by a bearing plate 36 which is arranged on the motor housing 14 and is fixed relative to the housing. For this purpose, the bearing plate 36 has a sleeve-shaped bearing section 37 which radially surrounds the output shaft 33 or the planet carrier 30 in the region of the first bearing point 34. The bearing section 37 carries a rolling bearing 38 which acts between the bearing section 37 and the first bearing point 34. Figure 3In the exemplary embodiment shown, the bearing plate 36 has a bearing plate flange 39 which, with reference to the axis of rotation of the planet carrier 30, rests axially against the motor housing flange 15. When the actuating device 1 is assembled, the bearing plate flange 39 is arranged axially between the motor housing flange 15 on one side and the gear housing flange 16 on the other side. The bearing plate flange 39 has a plurality of third fixing channels 40, wherein each of the third fixing channels 40 is aligned with a respective one of the first fixing channels 18 and a respective one of the second fixing channels 19. The fixing means 17 is also inserted into the third fixing channels 40. The bearing plate flange 39 also has a plurality of third orientation channels 41, wherein each of the third orientation channels 41 is aligned with a respective one of the first orientation channels 20 and a respective one of the second orientation channels 21. When the actuating device 1 is assembled, the third orientation channels 41 are likewise not occupied, or more precisely, are not occupied by fixing means.

[0033] The second bearing point 35 of the planet carrier 30 is supported by the transmission housing 12. Figure 3 In the embodiment shown, the transmission housing 12 has an axial channel 42, into which the driven shaft 33 projects. The inner side 43 of the transmission housing 12, which forms the axial channel 42, carries a rolling bearing 44, which acts between the second bearing point 35 of the driven shaft 33 and the transmission housing 12. In the present case, the rolling bearing 44 is designed as a needle bearing 44.

[0034] The planetary gear mechanism 28 also has a ring gear 45 fixed relative to the housing. The planetary gears 32 mesh with the sun gear 29 on the one hand and with the ring gear 45 on the other hand. The side wall outer surface 47 of the ring gear 45 abuts against the motor housing 14 radially on the inside.

[0035] The transmission 27 further comprises a gear 48 which is arranged in a rotationally fixed manner on the output shaft 33 or the planet carrier 30, in the present case between the first bearing point 34 and the second bearing point 35. As an example, the gear 48 comprises an internal toothing (not shown) which meshes with an output toothing (not shown) of the output shaft 33 in order to be connected in a rotationally fixed manner to the output shaft 33.

[0036] The transmission 27 further comprises a spindle transmission 49 with a rotatably mounted spindle nut 50. Here, the axis of rotation 51 of the spindle nut 50 corresponds to the longitudinal center axis of the actuator 3. In addition, the axis of rotation 51 of the spindle nut 50 is oriented parallel to the axis of rotation 26 of the motor shaft 25 or the planet carrier 30. The spindle transmission 49 further comprises a movable threaded spindle 52. The threaded spindle 52 can be moved by rotating the spindle nut 50, i.e. in a first direction 4 and in a second direction 5. Here, the threaded spindle 52 is coupled to the actuator 3, so that the actuator 3 can be moved at least in the first direction 4 via the threaded spindle 52. The spindle transmission 49 is arranged in an axial channel 53 of the transmission housing 12.

[0037] The transmission 27 further has another gear 54. The other gear 54 is arranged on the spindle nut 50 in a rotationally fixed manner. The driven toothing 55 of the gear 48 meshes with the driving toothing 56 of the other gear 54. Therefore, the other gear 54 can be rotated by rotating the gear 48. Therefore, the spindle transmission mechanism 49 can be driven or rotated by the motor 22.

[0038] according to Figure 3 In the embodiment shown, the motor shaft 25 is supported by the ring gear 45 on the side of the electric motor 22 facing the planetary gear 28. For this purpose, the ring gear 45 has a sleeve-shaped bearing section 57, which radially surrounds the motor shaft 25 between the sun gear 29 and the rotor 24. The bearing section 57 forms a sliding bearing for the motor shaft 25. On the side of the electric motor 22 facing away from the planetary gear 28, the motor shaft 25 is supported by the bottom 58 of the motor housing 14. For this purpose, the bottom 58 carries a rolling bearing 59, which acts between the motor shaft 25 and the bottom 58.

[0039] The operating device 1 further comprises a control unit 70 which is designed to actuate the electric motor 22 . The control unit 70 is arranged on the motor housing 14 on the side of the electric motor 22 facing away from the planetary gear 28 .

[0040] The operating device 1 further comprises an operating element 60, which is movably supported in an axial passage 61 of the threaded spindle 52. A first end 62 of the operating element 60 is coupled or can be coupled to a brake pedal of the brake system 2 via an input rod 63, so that the operating element 60 can be moved by actuating the brake pedal. A second end 64 of the operating element 60 is coupled to the actuator 3, so that the actuator 3 can be moved by the operating element 60. The friction brake device can also be actuated by actuating the brake pedal.

[0041] Figure 4 A drive unit 13 according to another embodiment is shown. Figure 4 The embodiment shown is Figure 3The embodiment shown differs in particular in that the bearing plate 36 bears radially on the inside against the motor housing 14. For example, the bearing plate 36 is pressed into the motor housing 14. The motor housing flange 15 bears directly against the transmission housing flange 16. In addition, Figure 4 In the illustrated embodiment, the output shaft 33 has an end-side recess 65. A bearing pin 66 fixed to the transmission housing 12 engages in the end-side recess 65 in order to support the output shaft 33. Figure 4 In the embodiment shown, the second bearing point 35 is formed by the inner side 67 of the output shaft 33 which forms the recess 65. Figure 4 In the exemplary embodiment shown, the motor shaft 25 is not supported by the ring gear 45 . Instead, the drive unit 13 has a further bearing plate 68 which is fixed relative to the housing and is arranged between the planetary gear 28 and the electric motor 22 and supports the motor shaft 25 .

[0042] When assembling the actuating device 1, preferably, a pre-assembled part is first provided, which has at least the motor housing 14, the electric motor 22, the planetary gear 28 and the bearing guard 36. The motor housing 14 is then arranged on the gear housing 12, so that the motor housing flange 15 is arranged opposite the gear housing flange 16. The desired orientation of the motor housing 14 relative to the gear housing 12 is then achieved by inserting a locating pin through each pair of orientation channels 20 and 21. If the bearing guard flange 39 is arranged between the motor housing flange 15 and the gear housing flange 16, the locating pin is also inserted through the third orientation channel 41, so that the desired orientation of the bearing guard 36 is also achieved by the locating pin. The locating pins inserted into the orientation channels 20, 21 and 41 can achieve a particularly precise definition of the position of the elements involved. For example, it can be achieved that the planet carrier 30 is oriented at least substantially axially parallel to the motor shaft 25. The gear housing 12 is then fixed to the motor housing 14 by the fixing means 17, wherein the orientation specified by the locating pins is maintained. Since the orientation is now fixed by the fixing means 17, the dowel pins are preferably removed. The embodiment in which the support plate flange 39 is arranged between the motor housing flange 15 and the transmission housing flange 16 is particularly advantageous, since the orientation of the support plate 36 is directly specified by the dowel pins. The tolerance chain with respect to the orientation or arrangement of the support plate 36 is minimized in this respect.

Claims

1. A drive unit for an actuating device of a brake system, the drive unit comprising: Motor housing (14); An electric motor (22) is arranged in the motor housing (14), wherein: The rotor (24) of the electric motor (22) is arranged in a rotationally fixed manner on a motor shaft (25) rotatably supported in the motor housing (14); and a planetary gear (28), via which the motor shaft (25) is connected or can be connected to an actuator (3) of the operating device (1), wherein the planetary gear (28) has a rotatably mounted planet carrier (30), and wherein the planet carrier (30) has a bearing section (31) on which at least one planet gear (32) is rotatably mounted, The invention is characterized in that a bearing cover (36) is provided which is arranged on the motor housing (14) and by which the planet carrier (30) is supported on the side of the planetary gear (32) facing away from the electric motor (22).

2. The drive unit according to claim 1, characterized in that: The bearing plate (36) carries a rolling bearing (38) for supporting the planet carrier (30).

3. Drive unit according to any one of the preceding claims, characterized in that The bearing shell (36) bears radially on the inside against the motor housing (14).

4. The drive unit according to any one of claims 1 and 2, characterized in that The bearing shell (36) bears axially against a motor housing flange (15) of the motor housing (14).

5. Drive unit according to any one of the preceding claims, characterized in that The planet carrier (30) has an output shaft (33), and the support plate (36) supports the output shaft (33).

6. The drive unit according to claim 5, characterized in that: The support section (31) is arranged in the motor housing (14), and the output shaft (33) protrudes from the motor housing (14).

7. Drive unit according to any one of the preceding claims, characterized in that The bearing plate (36) supports a first bearing point (34) of the planet carrier (30), and the planet carrier (30) has a second bearing point (35) which is arranged on a side of the first bearing point (34) facing away from the electric machine (22) and is spaced apart from the first bearing point (34).

8. Drive unit according to any one of the preceding claims, characterized in that The drive unit (13) has a further bearing plate (68) which is arranged between the planetary gear (28) and the electric motor (22) and supports the motor shaft (25).

9. An operating device for a brake system, comprising an actuator (3) and a drive unit (13) for driving the actuator (3), characterized in that: The drive unit (13) is designed according to any of the preceding claims.

10. The operating device according to claim 9, characterized in that The actuating device (1) has a transmission housing (12) which is fixed to the motor housing (14), and the second bearing point (35) of the planet carrier (30) is supported by the transmission housing (12).

11. The operating device according to claim 10, characterized in that The gear housing (12) carries a rolling bearing (44), preferably a needle bearing (44), for supporting the planet carrier (30).

12. The operating device according to claim 10, characterized in that The transmission housing (12) has a bearing pin (66) fixed relative to the housing and engaging in a recess (65) at the end of the planet carrier (30) for supporting the planet carrier (30).

13. The operating device according to any one of claims 10 to 12, characterized in that The motor housing flange (15) of the motor housing (14) has a plurality of first fixing channels (18), the transmission housing flange (16) of the transmission housing (12) has a plurality of second fixing channels (19), each of the first fixing channels (18) is aligned with another of the second fixing channels (19), and the transmission housing (12) is fixed to the motor housing (14) by means of fixing devices (17) inserted into the fixing channels (18, 19).

14. The operating device according to claim 13, characterized in that The fixing means (17) is designed as a reamed bolt.

15. The operating device according to any one of claims 10 to 14, characterized in that The motor housing flange (15) has a plurality of first orientation channels (20), and the transmission mechanism housing flange (16) has a plurality of second orientation channels (21), each of the first orientation channels (20) is aligned with another second orientation channel in the second orientation channels (21), and the orientation channels (20, 21) are not occupied.

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