Drive unit for operating device of braking system, operating device

Abstract

The present invention relates to a drive unit (13) for an operating device (1) of a braking system (2), comprising a motor housing (14), an electromechanical machine (22) arranged in the motor housing (14), a rotor (24) of the electromechanical machine (22) being non-rotatably arranged on a motor shaft (25) rotatably supported in the motor housing (14), and a planetary transmission mechanism (28), by means of which the motor shaft (25) can be or is coupled to an actuator element (3) of the operating device (1), the planetary transmission mechanism (28) having a rotatably supported planetary carrier (30), and the planetary carrier (30) having a carrier section (31) on which at least one planet wheel (32) is rotatably supported. 【Solution means】The drive unit (13) comprises a bearing shield (36) arranged in the motor housing (14), by means of which the planetary carrier (30) is supported on the side of the planet wheel (32) facing away from the electromechanical machine (22).

Description

Technical Field

[0001] The present invention relates to a drive unit for an operating device of a brake system, comprising a motor housing, an electromechanical machine disposed within the motor housing, a rotor of the electromechanical machine being non-rotatably disposed on a motor shaft rotatably supported within the motor housing, and a planetary transmission mechanism, wherein the motor shaft is connectable to, or is connected to, an actuator element of the operating device by means of the planetary transmission mechanism, the planetary transmission mechanism having a rotatably supported planetary carrier, and the planetary carrier having a carrier section on which at least one planet gear is rotatably supported.

[0002] Furthermore, the present invention relates to an operating device for a brake system, comprising an actuator element and a drive unit for driving the actuator element.

Background Art

[0003] A drive unit in the form mentioned at the beginning is known from the prior art. As the electrification of motor vehicles progresses, the electrification of operating devices for brake systems is also advancing. For this purpose, the operating device comprises a drive unit with an electromechanical machine disposed within a motor housing. The rotor of the electromechanical machine is then non-rotatably disposed on a motor shaft rotatably supported within the motor housing. In order to achieve high torque, a planetary transmission mechanism is often connected downstream of the motor shaft, so that the motor shaft is connectable to, or is connected to, an actuator element of the operating device by means of the planetary transmission mechanism. Typically, the planetary transmission mechanism then has a rotatably supported planetary carrier, and the planetary carrier has a carrier section on which at least one planet gear is rotatably supported.

Summary of the Invention

[0004] The drive unit according to the present invention having the features of claim 1 has the advantage that the incorporation of the drive unit into the operating device is simplified compared to previously known solutions. For this purpose, according to the present invention, the drive unit comprises a bearing shield arranged in the motor housing, and by means of the bearing shield, the planetary carrier is supported on the side of the planet gears facing away from the electric machine. The support of the planetary carrier by the bearing shield arranged in the motor housing enables the electric machine and the planetary transmission mechanism to be handled together as a front assembly group. Correspondingly, the planetary transmission mechanism does not need to be technically connected to the electric machine or the motor shaft for the first time within the framework of the final assembly of the operating device. The reduction in the assembly effort from the perspective of the final assembly ultimately leads to a reduction in the manufacturing costs of the operating device. Since the bearing shield supports the planetary carrier on the side of at least one planet gear facing away from the electric machine, it is achieved that the planetary carrier is held particularly securely on the bearing shield and thus on the motor housing. Preferably, this is assisted by the fact that the part of the rotary bearing that can rotate with the planetary carrier forms an axial stop for the carrier section. Preferably, the bearing shield is attached to the motor housing, for example, by means of one or more attachment means. Preferably, a plurality of planet gears are rotatably supported in the carrier section, and the bearing shield supports the planetary carrier on the side of the plurality of planet gears facing away from the electric machine in this case. Particularly preferably, at least three planet gears are rotatably supported in the carrier section.

[0005] According to a preferred embodiment, it is contemplated that the bearing shield carries a rolling bearing for supporting the planetary carrier. Thereby, low-friction support of the planetary carrier is achieved. In addition, by means of the rolling bearing, the position of the planetary carrier can be defined particularly precisely.

[0006] According to a preferred embodiment, the bearing shield is intended to abut against the motor housing radially from the inside. The bearing shield is thus arranged at least partly within the motor housing and is thus packed so that less space is required for assembly. In addition, by the radial abutment, it can be achieved that the bearing shield is mechanically firmly attached to the motor housing. Preferably, the bearing shield is press-fitted into the motor housing and is thus attached to the motor housing by press fitting. Instead of this, the bearing shield is attached to the motor housing, for example, by adhesive bonding or by welding bonding.

[0007] According to a preferred embodiment, the bearing shield is intended to abut against the motor housing flange of the motor housing axially. By forming the drive unit in this way, a particularly precise definition of the position of the planetary carrier can be achieved based on the minimization of the tolerance chain. This will be explained in more detail below. In particular, the bearing shield has a bearing shield flange, and the bearing shield flange abuts axially against the motor housing flange with respect to the rotational axis of the planetary carrier.

[0008] According to a preferred embodiment, the planetary carrier has a driven shaft and the bearing shield is intended to support the driven shaft. Since the bearing shield supports a driven shaft having a relatively small diameter, that is, a shaft-shaped or axle-shaped element, a rotary bearing having a small diameter can also be used. This leads to a further reduction in the manufacturing costs for the drive unit or the operating device.

[0009] According to a preferred embodiment, it is provided that the carrier section is arranged in the motor housing and the driven shaft projects from the motor housing. Due to the arrangement of the carrier section in the motor housing, the drive unit is designed to be compact and requires little space for installation. Since the driven shaft projects from the motor housing, it is technically easy to realize a drive-mechanical coupling of the driven shaft to further drive-mechanical elements.

[0010] According to a preferred embodiment, it is provided that the bearing shield supports a first bearing location of the planet carrier and that the planet carrier has a second bearing location, which is arranged on the side of the first bearing location facing away from the electric machine and spaced apart from the first bearing location. By providing two bearing locations spaced apart from one another, a precise support of the planet carrier can be achieved. In particular, during operation of the drive unit, the introduction of lateral forces into the planetary gear is at least reduced. When the drive unit is assembled correctly and when the elements supporting the bearing locations are designed correctly, the introduction of lateral forces into the planetary gear can even be effectively avoided. Preferably, the driven shaft has at least a second bearing location, particularly preferably the first and second bearing locations. Preferably, the planet carrier or the driven shaft has a driven toothing between the bearing locations.

[0011] According to a preferred embodiment, the drive unit comprises a further bearing shield, which is arranged between the planetary gear mechanism and the electric machine and is intended to support the motor shaft. In addition to the bearing shield supporting the planet carrier, there is another bearing shield, which in turn supports the motor shaft. By means of this further bearing shield, the position of the motor shaft can be precisely defined. Preferably, the carrier section of the planet carrier is arranged between the bearing shield and the further bearing shield.

[0012] The operating device according to the invention is characterized, according to the features of claim 9, by the formation according to the invention of the drive unit. From this, too, the advantages already mentioned arise. Further preferred features and combinations of features can be seen from the previous description and the claims.

[0013] According to a preferred embodiment, it is contemplated that the operating device comprises a transmission housing attached to the motor housing, and that the second bearing location of the planetary carrier is supported by the transmission housing. By supporting the first and second bearing locations of the planetary carrier, the introduction of lateral forces into the planetary transmission during operation of the operating device is effectively avoided.

[0014] According to a preferred embodiment, it is contemplated that the transmission housing carries a rolling bearing in order to support the planetary carrier. By means of the rolling bearing, low-friction support of the planetary carrier within the transmission housing is achieved. In addition, the position of the second bearing location of the planetary carrier can be defined particularly precisely by means of the rolling bearing. Particularly preferably, the rolling bearing is formed as a needle bearing.

[0015] According to an alternative embodiment, preferably the transmission housing has a housing-fixed bearing pin which is intended to engage in a recess in the end face of the planetary carrier in order to support the planetary carrier. This configuration of the operating device is advantageous since, from the point of view of the manufacturing costs of the operating device, relatively expensive rolling bearings can be saved. Preferably, the bearing pin forms a sliding bearing for the planetary carrier.

[0016] According to a preferred embodiment, the motor housing flange of the motor housing has a plurality of first mounting through-holes, the transmission mechanism housing flange of the transmission mechanism housing has a plurality of second mounting through-holes, each of the first mounting through-holes is aligned in a straight line with a respective separate second mounting through-hole, and it is contemplated that the transmission mechanism housing is attached to the motor housing by attachment means inserted into the mounting through-holes. Thereby, it can be achieved that the motor housing is mechanically and particularly robustly attached to the transmission mechanism housing. As previously mentioned, the bearing shield preferably abuts the motor housing radially from the inside. In this embodiment, the transmission mechanism housing flange preferably abuts the motor housing flange directly axially. As previously mentioned, the bearing shield may also abut the motor housing flange axially. Alternatively, the bearing shield flange of the bearing shield is preferably arranged between the motor housing flange and the transmission mechanism housing flange in this case. Particularly preferably, the bearing shield or the bearing shield flange has a plurality of third mounting through-holes in this case, each of the third mounting through-holes being aligned in a straight line with one of each of the first mounting through-holes and one of each of the second mounting through-holes. The attachment means are also inserted into the third mounting through-holes in this case. Preferably, the attachment means are formed as screws.

[0017] Particularly preferably, the attachment means is formed as a stepped screw. The stepped screw is a screw having a first axial section and a second axial section. The first axial section has a thread helix, and the second axial section is a screw formed as a guide section. Preferably, the stepped screw is formed such that the guide section is arranged in the attachment through-hole with at least substantially no radial play. By means of the stepped screw, in addition to mechanically and robustly attaching the motor housing to the transmission mechanism housing, it is also possible to achieve a relatively precise orientation of the motor housing with respect to the transmission mechanism housing. This results in the desired orientation of the planetary carrier also being precisely achievable. For example, it can be achieved that the axis of rotation of the planetary carrier is oriented parallel to the axis of rotation of the motor shaft. This axis-parallel orientation has the advantage that the introduction of lateral forces into the planetary transmission mechanism is particularly effectively reduced. As previously mentioned, according to a preferred embodiment, the bearing shield abuts axially against the motor housing flange. When a stepped screw is used as the attachment means, in this case, the bearing shield is also precisely oriented by the stepped screw. This involves a particularly precise definition of the position of the planetary carrier. This is because the chain of tolerances is minimized by the direct orientation of the bearing shield by the stepped screw.

[0018] According to a preferred embodiment, the motor housing flange has a plurality of first orienting through-holes, the transmission mechanism housing flange has a plurality of second orienting through-holes, each of the first orienting through-holes is aligned with a respective separate second orienting through-hole, and the orienting through-holes are intended to be unoccupied. The orienting through-holes are unoccupied, and as a result, in the assembled operating device, attachment means or the like are not disposed within the orienting through-holes. The orienting through-holes are thus without attachment means. In that regard, the orienting through-holes do not contribute to attaching the transmission mechanism housing to the motor housing. The orienting through-holes, however, provide an advantage from the perspective of assembling the operating device. For example, when assembling the operating device, the following is done. First, a drive unit is prepared and the motor housing flange is disposed on the transmission mechanism housing such that the motor housing flange faces the transmission mechanism housing flange. Subsequently, the desired orientation of the motor housing relative to the transmission mechanism housing is achieved by inserting one fitting pin through each pair of the orienting through-holes. Subsequently, the transmission mechanism housing and the motor housing are attached in contact with each other, for example, by inserting attachment means into the previously mentioned attachment through-holes. This attachment, however, may be achieved in another way, so the presence of the orienting through-holes does not necessarily presuppose the presence of the attachment through-holes. The orientation of the transmission mechanism housing relative to the motor housing is subsequently fixed by the attachment means, so the fitting pins are subsequently preferably removed. The orienting through-holes can achieve the advantages previously already described in connection with the stepped screw. As previously mentioned, the bearing shield, according to a preferred embodiment, axially abuts against the motor housing flange. In the present embodiment, the bearing shield preferably has a plurality of third orienting through-holes, each of the third orienting through-holes being aligned with one of each of the first orienting through-holes and one of each of the second orienting through-holes. When the fitting pins are inserted into the orienting through-holes, the fitting pins also precisely orient the bearing shield in this case.As mentioned previously, this involves a particularly refined definition of the position of the planetary carrier, based on minimizing the chain of tolerances.

[0019] The present invention will be described in detail below with reference to the drawings.

Brief Description of the Drawings

[0020]

Figure 1

Figure 2

Figure 3

Figure 4

Embodiments for Carrying Out the Invention

[0021] FIG. 1 shows a cross-sectional view of an operating device 1 for a brake system 2 of an automobile, not shown in detail.

[0022] The operating device 1 comprises a thrust element 3 or an actuator element 3 that is supported slidably, and here, the thrust element 3 or the actuator element 3 is formed as a push rod 3. The actuator element 3 is slidable in a first direction 4 and a second direction 5 opposite to the first direction 4. The actuator element 3 is arranged at least partially within the housing 6 of the operating device 1. In the housing 6, a main brake cylinder 7 of the operating device 1 is arranged fixed to the housing. Within the main brake cylinder 7, a first hydraulic piston 8 and a second hydraulic piston 9 are supported slidably, that is, slidably supported in the first direction 4 and the second direction 5. The main brake cylinder 7 has a plurality of hydraulic ports 10, 11. When the operating device 1 is assembled into the brake system 2 as specified, the hydraulic ports 10, 11 are fluid-technologically connected to the slave cylinders of the friction brake device of the brake system 2. In this case, the friction brake device is operable by the sliding of the hydraulic pistons 8 and 9 in the first direction 4. The actuator element 3 is connected to the hydraulic pistons 8 and 9 such that the hydraulic pistons 8 and 9 are slidable in the first direction 4 by the actuator element 3. The friction brake device is thus operable by the sliding of the actuator element 3.

[0023] The operating device 1 further comprises a transmission mechanism housing 12. The housing 6 and the transmission mechanism housing 12 are attached in contact with each other. Here, the transmission mechanism housing 12 is formed in a shell shape.

[0024] The operating device 1 further includes a drive unit 13. The drive unit 13 includes a motor housing 14. The motor housing 14 is attached to the transmission mechanism housing 12. This will be described in detail below with reference to FIG. 2. FIG. 2 shows a perspective detailed view of the operating device 1 for this purpose. As can be seen from FIG. 2, the motor housing 14 has a motor housing flange 15, and the transmission mechanism housing 12 has a transmission mechanism housing flange 16. The mounting surface of the motor housing flange 15 and the mounting surface of the transmission mechanism housing flange 16 face each other. The motor housing flange 15 is attached to the transmission mechanism housing flange 16 by a plurality of attachment means 17, and the attachment means 17 are formed here as screws 17. The attachment means 17 are inserted into each one of the first attachment through-holes 18 of the motor housing flange 15 and into each one of the second attachment through-holes 19 of the transmission mechanism housing flange 16. This can be seen exemplarily from FIG. 3 with respect to one of the attachment means 17.

[0025] The motor housing flange 15 further has a plurality of first orientation through-holes 20. The transmission mechanism housing flange 16 has a plurality of second orientation through-holes 21, and each of the first orientation through-holes 20 is aligned in a straight line with a respective different second orientation through-hole 21. As can be seen from FIG. 2, the orientation through-holes 20 and 21 are not occupied or are without attachment means in the assembled operating device 1. The orientation through-holes 20 and 21 thus do not contribute to attaching the transmission mechanism housing 12 to the motor housing 14. However, the orientation through-holes 20 and 21 necessarily have advantages during the assembly of the operating device 1, as will be explained in more detail later.

[0026] The configuration of the drive unit 13 will be described in detail below with reference to FIG. 3. The drive unit 13 includes an electromechanical machine 22 disposed within a motor housing 14. A stator 23 of the electromechanical machine 22 is disposed within the motor housing 14 in a housing-fixed manner. A rotor 24 of the electromechanical machine 22 is disposed non-rotatably relative to a motor shaft 25. The motor shaft 25 is rotatably supported within the motor housing 14 about a rotation axis 26.

[0027] The motor shaft 25 is connected to an actuator element 3 by a transmission mechanism device 27 such that the actuator element 3 is slidable by the electromechanical machine 22. The transmission mechanism device 27 has a planetary transmission mechanism 28, and the planetary transmission mechanism 28 is drivable or rotatable by the motor shaft 25. For this purpose, a sun gear 29 of the planetary transmission mechanism 28 is disposed non-rotatably relative to the motor shaft 25. The planetary transmission mechanism 28 further has a planetary carrier 30 that is rotatably supported. A rotation axis of the planetary carrier 30 corresponds to the rotation axis 26 of the motor shaft 25. The planetary carrier 30 has a plate-shaped carrier section 31, and a plurality of planet gears 32 are rotatably supported by the carrier section 31. Here, three planet gears 32 are rotatably supported by the carrier section 31. The carrier section 31 is disposed within the motor housing 14. The planetary carrier 30 further has a driven shaft 33, and the driven shaft 33 is disposed on a side of the carrier section 31 that is away from the electromechanical machine 22 and is non-rotatably coupled to the carrier section 31. The driven shaft 33 projects axially from the motor housing 14 with respect to the rotation axis of the planetary carrier 30.

[0028] 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 carrier section 31 on the side of the planetary wheel 32 facing away from the electric machine 22. The second bearing location 35 is arranged on the side of the first bearing location 34 facing away from the electric machine 22 and is spaced apart from the first bearing location 34. Here, the driven shaft 33 has the bearing locations 34 and 35, so that the planet carrier 30 is supported by the bearing of the driven shaft 33.

[0029] The first bearing location 34 is supported by a housing-fixed bearing shield 36 arranged on the motor housing 14. The bearing shield 36 has for this purpose a sleeve-shaped bearing section 37 which radially surrounds the driven shaft 33 or the planet carrier 30 in the area of ​​the first bearing location 34. The bearing section 37 carries a rolling element bearing 38 which acts between the bearing section 37 and the first bearing location 34. According to the embodiment shown in FIG. 3, the bearing shield 36 has a bearing shield flange 39 which rests axially against the motor housing flange 15 with respect to the axis of rotation of the planet carrier 30. The bearing shield flange 39 is thus arranged in the assembled actuator 1 axially between the motor housing flange 15 on the one hand and the transmission housing flange 16 on the other hand. The bearing shield flange 39 has a plurality of third mounting penetrations 40, each of which is aligned with a respective separate first mounting penetration 18 and a respective separate second mounting penetration 19. The mounting means 17 is also inserted into the third mounting penetrations 40. The bearing shield flange 39 further has a plurality of third orientation penetrations 41, each of which is aligned with a respective separate first orientation penetration 20 and a respective separate second orientation penetration 21. The third orientation penetrations 41 are also unoccupied or without mounting means in the assembled operating device 1.

[0030] The second bearing portion 35 of the planetary carrier 30 is supported by the transmission mechanism housing 12. According to the embodiment shown in FIG. 3, the transmission mechanism housing 12 has an axially penetrating portion 42, and the driven shaft 33 penetrates into the axially penetrating portion 42. The inner surface 43 of the surrounding portion forming the axially penetrating portion 42 of the transmission mechanism housing 12 carries a rolling bearing 44, and the rolling bearing 44 acts between the second bearing portion 35 of the driven shaft 33 and the transmission mechanism housing 12. Here, the rolling bearing 44 is formed as a needle bearing 44.

[0031] The planetary transmission mechanism 28 further has a housing-fixed hollow gear 45. The planetary gear 32 meshes with the sun gear 29 on the one hand and with the hollow gear 45 on the other hand. The outer surface 47 of the surrounding wall of the hollow gear 45 abuts against the motor housing 14 in the radial direction from the inside.

[0032] The transmission mechanism device 27 further has a gear 48, and the gear 48 is arranged on the driven shaft 33 or the planetary carrier 30 in a non-rotatable relative manner, and here it is arranged between the first bearing portion 34 and the second bearing portion 35. For example, the gear 48 has an invisible internal tooth row, and the internal tooth row meshes with the invisible driven tooth row of the driven shaft 33 for non-rotatable connection with the driven shaft 33.

[0033] The transmission mechanism device 27 further has a spindle transmission mechanism 49, and the spindle transmission mechanism 49 has a spindle nut 50 that is rotatably supported. At this time, the rotation axis 51 of the spindle nut 50 corresponds to the longitudinal central axis of the actuator element 3. In addition, the rotation axis 51 of the spindle nut 50 is oriented parallel to the rotation axis 26 of the motor shaft 25 or the planetary carrier 30. The spindle transmission mechanism 49 further has a slidable threaded spindle 52. The threaded spindle 52 is slidable by the rotation of the spindle nut 50, that is, slidable in the first direction 4 and the second direction 5. At this time, the threaded spindle 52 is connected to the actuator element 3 such that the actuator element 3 is slidable by the threaded spindle 52 at least in the first direction 4. The spindle transmission mechanism 49 is disposed in the axial through portion 53 of the transmission mechanism housing 12.

[0034] The transmission mechanism device 27 further has another gear 54. This another gear 54 is disposed on the spindle nut 50 in a non-rotatable relative manner. The driven tooth row 55 of the gear 48 meshes with the driving tooth row 56 of this another gear 54. This another gear 54 is thus rotatable by the rotation of the gear 48. Correspondingly, the spindle transmission mechanism 49 is drivable or rotatable by the electromechanical device 22.

[0035] According to the embodiment shown in FIG. 3, the motor shaft 25 is supported by the hollow wheel 45 on the side of the electromechanical device 22 facing the planetary transmission mechanism 28. The hollow wheel 45 has a sleeve-shaped bearing section 57 for this purpose, and the bearing section 57 radially surrounds the motor shaft 25 between the sun wheel 29 and the rotor 24. At this time, the bearing section 57 forms a sliding bearing for the motor shaft 25. On the side of the electromechanical device 22 facing away from the planetary transmission mechanism 28, the motor shaft 25 is supported by the bottom 58 of the motor housing 14. The bottom 58 carries a rolling bearing 59 for this purpose, and the rolling bearing 59 acts between the motor shaft 25 and the bottom 58.

[0036] The operating device 1 further includes a control device 70, which is configured to operationally control the electromechanical machine 22. The control device 70 is disposed in the motor housing 14 on the side of the electromechanical machine 22 that is away from the planetary transmission mechanism 28.

[0037] The operating device 1 further includes an operating element 60, which is slidably supported within the axial through portion 61 of the threaded spindle 52. The first end portion 62 of the operating element 60 can be connected, or is connected, to the brake pedal of the brake system 2 by means of an input rod 63. As a result, the operating element 60 is slidable in this case by operating the brake pedal. The second end portion 64 of the operating element 60 is connected to the actuator element 3 such that the actuator element 3 is slidable by the operating element 60. The friction brake device is thus also operable by operating the brake pedal.

[0038] FIG. 4 shows a drive unit 13 according to another embodiment. The embodiment shown in FIG. 4 differs from the embodiment shown in FIG. 3, in particular, in that the bearing shield 36 abuts the motor housing 14 radially from the inside. For example, the bearing shield 36 is press-fitted into the motor housing 14. The motor housing flange 15 abuts directly against the transmission mechanism housing flange 16. Further, the driven shaft 33 has a recess 65 in the end face in the embodiment shown in FIG. 4. A bearing pin 66 attached to the transmission mechanism housing 12 engages within the recess 65 in the end face to support the driven shaft 33. The second bearing location 35 is correspondingly formed by the inner surface 67 of the surrounding portion of the driven shaft 33 that forms the recess 65 in the embodiment shown in FIG. 4. Further, the motor shaft 25 is not supported by the hollow wheel 45 in the embodiment shown in FIG. 4. Instead, the drive unit 13 includes another bearing shield 68 fixed to the housing, which is disposed between the planetary transmission mechanism 28 and the electromechanical machine 22 and supports the motor shaft 25.

[0039] When assembling the operating device 1, it is preferably carried out as follows. First, prepare a front component group having at least a motor housing 14, an electromechanical device 22, a planetary transmission mechanism 28, and a bearing shield 36. Then, place the motor housing 14 in the transmission mechanism housing 12 such that the motor housing flange 15 faces the transmission mechanism housing flange 16. Subsequently, achieve the desired orientation of the motor housing 14 relative to the transmission mechanism housing 12 by inserting one fitting pin through each pair of orientation through-holes 20 and 21. When the bearing shield flange 39 is disposed between the motor housing flange 15 and the transmission mechanism housing flange 16, insert the fitting pin also through the third orientation through-hole 41, and as a result, the desired orientation of the bearing shield 36 is also achieved by the fitting pin. A particularly precise definition of the positions of the involved elements can be achieved by the fitting pins inserted into the orientation through-holes 20, 21, and 41. For example, it can be achieved that the planetary carrier 30 is oriented at least substantially parallel to the motor shaft 25. Subsequently, attach the transmission mechanism housing 12 to the motor housing 14 by attachment means 17. At this time, the orientation pre-given by the fitting pin is maintained. Since the orientation is now fixed by the attachment means 17, the fitting pin is preferably removed. The embodiment in which the bearing shield flange 39 is disposed between the motor housing flange 15 and the transmission mechanism housing flange 16 is particularly advantageous. This is because the orientation of the bearing shield 36 is directly pre-given by the fitting pin. The chain of tolerances regarding the orientation or arrangement of the bearing shield 36 is minimized in that regard.

Explanation of Signs

[0040] 1 Operating device 2 Brake system 3 Thrust element, actuator element, push rod 4 First direction 5 Second direction 6 Housing 7 Master brake cylinder 8 First hydraulic piston 9 Second hydraulic piston 10 Hydraulic port 11 Hydraulic port 12 Transmission mechanism housing 13 Drive unit 14 Motor housing 15 Motor housing flange 16 Transmission mechanism housing flange 17 Mounting means, screw 18 First mounting through-hole 19 Second mounting through-hole 20 First alignment through-hole 21 Second alignment through-hole 22 Electromechanical device 23 Stator 24 Rotor 25 Motor shaft 26 Axis of rotation 27 Transmission mechanism device 28 Planetary transmission mechanism 29 Sun gear 30 Planetary carrier 31 Carrier section 32 Planet gear 33 Driven shaft 34 First bearing location 35 Second bearing location 36 Bearing shield 37 Bearing section 38 Rolling bearing 39 Bearing shield flange 40 Third mounting through-hole 41 Third alignment through-hole 42 Axial through-hole 43 Inner surface of the surrounding part 44 Rolling bearing, needle bearing 45 Hollow gear 47 Outer surface of the surrounding wall 48 Gear 49 Spindle transmission mechanism 50 Spindle nut 51 Axis of rotation 52 Threaded spindle 53 Axial through-hole 54 Another gear 55 Driven tooth row 56 Driving tooth row 57 Bearing section 58 Bottom part 59 Rolling bearing 60 Operating element 61 Axial through-hole 62 First end 63 Input rod 64 Second end 65 Recess 66 Bearing pin 67 Inner surface of the surrounding part 68 Another bearing shield 70 Control device

Claims

1. A drive unit for an operating device of a braking system, comprising: a motor housing (14); an electromechanical machine (22) disposed within the motor housing (14), wherein a rotor (24) of the electromechanical machine (22) is non-rotatably disposed on a motor shaft (25) rotatably supported within the motor housing (14), and a planetary transmission mechanism (28), by which the motor shaft (25) is connectable to or is connected to an actuator element (3) of the operating device (1), the planetary transmission mechanism (28) having a rotatably supported planetary carrier (30), and the planetary carrier (30) having a carrier section (31) on which at least one planet gear (32) is rotatably supported; wherein in the drive unit, a bearing shield (36) is disposed on the motor housing (14), by which the planetary carrier (30) is supported on a side of the planet gear (32) facing away from the electromechanical machine (22); a drive unit for an operating device of a braking system, characterized in that.

2. The drive unit according to claim 1, characterized in that the bearing shield (36) carries a rolling bearing (38) that supports the planetary carrier (30).

3. The drive unit according to claim 1 or 2, characterized in that the bearing shield (36) abuts the motor housing (14) radially from the inside.

4. The drive unit according to claim 1 or 2, characterized in that the bearing shield (36) abuts the motor housing flange (15) of the motor housing (14) axially.

5. The drive unit according to any one of claims 1 to 4, characterized in that the planetary carrier (30) has a driven shaft (33), and the bearing shield (36) supports the driven shaft (33).

6. The drive unit according to claim 5, characterized in that the carrier section (31) is disposed within the motor housing (14), and the driven shaft (33) projects from the motor housing (14).

7. 7. The drive unit according to claim 1, wherein the bearing shield (36) supports a first bearing point (34) of the planet carrier (30), and the planet carrier (30) has a second bearing point (35), the second bearing point (35) being arranged on a side of the first bearing point (34) facing away from the electric machine (22) and spaced apart from the first bearing point (34).

8. 8. The drive unit according to claim 1, further comprising a further bearing shield (68) arranged between the planetary gear mechanism (28) and the electric machine (22) and supporting the motor shaft (25).

9. 9. An actuating device for a brake system, comprising an actuator element (3) and a drive unit (13) for driving said actuator element (3), characterized in that said drive unit (13) is formed according to any one of claims 1 to 8.

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

11. 11. An operating device according to claim 10, characterized in that the transmission housing (12) carries rolling element bearings (44), preferably needle bearings (44), for supporting the planet carrier (30).

12. 11. The operating device according to claim 10, characterized in that the transmission mechanism housing (12) has a bearing pin (66) fixed to the housing, the bearing pin (66) engaging in a recess (65) in an end face of the planet carrier (30) to support the planet carrier (30).

13. The motor housing flange (15) of the motor housing (14) has a plurality of first mounting through-holes (18), the transmission mechanism housing flange (16) of the transmission mechanism housing (12) has a plurality of second mounting through-holes (19), each of the first mounting through-holes (18) is aligned in a straight line with a respective one of the second mounting through-holes (19), and the transmission mechanism housing (12) is attached to the motor housing (14) by attachment means (17) inserted into the mounting through-holes (18, 19), the operating device according to any one of claims 10 to 12.

14. The attachment means (17) is formed as a stepped screw, the operating device according to claim 13.

15. The motor housing flange (15) has a plurality of first orientation through-holes (20), the transmission mechanism housing flange (16) has a plurality of second orientation through-holes (21), each of the first orientation through-holes (20) is aligned in a straight line with a respective one of the second orientation through-holes (21), and the orientation through-holes (20, 21) are not occupied, the operating device according to any one of claims 10 to 14.

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