Geared motor comprising a gearbox and an electric motor, and method for producing variants in a type series of geared motors
Patent Information
- Application Number
- EP2023748275
- Authority / Receiving Office
- EP · EP
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2022-09-13
- Filing Date
- 2023-07-27
- Publication Date
- 2025-07-23
AI Technical Summary
Existing geared motors face challenges in producing high gear ratios in a simple and cost-effective manner, as they require complex alignments and components that are difficult to vary for different applications.
The geared motor design features a gearbox and electric motor with a bearing flange having discrete rotational symmetry axes offset from the gearbox's axis, allowing for a higher axial offset and thus a higher gear ratio, and includes interchangeable bearing flanges with coaxial or non-coaxial drilling patterns to achieve varying gear ratios with minimal components.
This design enables the production of geared motors with high and varying gear ratios using a small number of components, allowing for efficient use of space and easy assembly, while maintaining stability and reducing resonance vibrations.
Smart Images
Figure 1.1
Abstract
Description
[0001] Geared motor comprising a gearbox and an electric motor, and method for producing variants of a series of geared motors
[0002] Description:
[0003] The invention relates to a geared motor comprising a gearbox and an electric motor, and to a method for producing variants of a series of geared motors.
[0004] It is known that in a geared motor, an electric motor of the geared motor drives a gearbox of the geared motor.
[0005] From DE 10 2021 003 134 A1, the closest prior art is a geared motor with an adapter flange.
[0006] A geared motor is known from DE 10 2014 008 330 A1.
[0007] The invention is therefore based on the object of developing a geared motor, whereby a high gear ratio can be produced in a simple and cost-effective manner.
[0008] According to the invention, the object is achieved in the geared motor according to the features specified in claim 1.
[0009] Important features of the invention in the geared motor according to claim 1, comprising a
[0010] Gearbox and an electric motor, are that the geared motor has a housing part of the gearbox, a bearing flange, a stator housing of the electric motor, a rotor shaft and a bearing, wherein the bearing is received in the bearing flange, wherein the inner ring of the bearing is placed on the rotor shaft, wherein the bearing flange has a motor-side drilling pattern, in particular a motor-side drilling pattern on its side facing away from the housing part of the gearbox, in particular for first fastening elements connecting the stator housing to the bearing flange, in particular screws, wherein the bearing flange has a gearbox-side drilling pattern, in particular a gearbox-side drilling pattern on its side facing away from the stator housing, in particular for further fastening elements connecting the housing part of the gearbox to the bearing flange, in particular further screws, wherein the motor-side drilling pattern has a discrete or integer rotational symmetry axis,which is parallel and spaced, i.e. not coaxial, to a discrete or integer rotational symmetry axis of the gearbox-side bore pattern.
[0011] In particular, a discrete rotational symmetry axis, especially a rotational symmetry axis, is understood to be the mathematically conceived symmetry axis for which a rotation of the hole pattern by an angle of 3607n transforms the hole pattern into itself, thus leaving it unchanged, where n is a natural number greater than one. Alternatively, a rotational symmetry axis with this symmetry is referred to as an integer rotational symmetry axis, since the rotational symmetry is n-fold.
[0012] The advantage here is that the offset of the two mutually parallel axes of rotational symmetry of the electric motor including the rotor shaft relative to the axis of rotation of the wheel of the input stage of the gearbox allows for a greater axial offset between the axis of rotation of the rotor shaft and the axis of rotation of the wheel, thus resulting in a much higher gear ratio of the input angular gear stage of the gearbox. The motor is, so to speak, higher, i.e., shifted more in the direction perpendicular to the direction of the axis of rotation of the wheel and perpendicular to the direction of the axis of rotation of the rotor shaft, thus with coaxial alignment of the axis of rotational symmetry of the two bore patterns. Important features of the geared motor according to claim 2, comprising a gearbox and an electric motor, are that the geared motor comprises a housing part of the gearbox, a bearing flange, a stator housing of the electric motor, a rotor shaft, and a bearing, wherein the bearing is received in the bearing flange.wherein the inner ring of the bearing is placed on the rotor shaft, wherein the bearing flange has a first cheek and a second cheek connected to the first cheek via a web, in particular wherein the second cheek is arranged on the side of the web axially facing away from the stator housing and the first cheek is arranged on the side axially facing away from the housing part of the gearbox, wherein the axial direction is aligned parallel to the axis of rotation of the rotor shaft, wherein the first cheek is centered to the stator housing via a first centering collar, wherein the first centering collar is formed on the first cheek or on the stator housing, wherein the second cheek is centered to the housing part of the gearbox via a second centering collar, wherein the second centering collar is formed on the second cheek or on the housing part of the gearbox, wherein the first centering collar has a rotational axis of symmetry,which is aligned parallel to and spaced from a rotational symmetry axis of the second centering collar and / or wherein the first centering collar is designed as a continuous or interrupted circular ring, the ring axis of which is aligned parallel to and spaced from the ring axis of the second centering collar designed as a continuous or interrupted circular ring, in particular wherein the first centering collar is designed as a hollow cylinder and the second centering collar is designed as a further hollow cylinder.
[0013] In the present description, an annulus is understood to mean an annular spatial region that resembles a flat hollow cylinder.
[0014] The advantage here is that fitting and / or centering when connecting the bearing flange to the stator housing or the housing part can be carried out quickly and easily.
[0015] Another advantage is that the offset of the two parallel axes of rotational symmetry or ring axes of the electric motor and rotor shaft relative to the axis of rotation of the wheel of the input stage of the gearbox allows for a larger axial offset between the axis of rotation of the rotor shaft and the axis of rotation of the wheel, thus resulting in a much higher gear ratio of the input angular gear stage of the gearbox. The motor is, so to speak, higher, i.e., shifted more in a direction perpendicular to the direction of the axis of rotation of the wheel and perpendicular to the direction of the axis of rotation of the rotor shaft, thus ensuring a coaxial alignment of the axis of rotational symmetry or ring axis.
[0016] The invention therefore makes it possible to achieve a smaller center distance between the wheel's axis of rotation and the pinion's axis of rotation by replacing the bearing flange with another bearing flange in which the two bore patterns are aligned coaxially to one another, and thus also smaller gear ratios. By stocking the two different bearing flanges, different versions of geared motors can be produced as required. Overall, a high degree of variance can be achieved with few components, particularly when manufacturing geared motors from one series. In an advantageous embodiment, the rotor shaft's axis of rotation is aligned coaxially with the discrete or integer rotational symmetry axis of the motor-side bore pattern. One advantage here is that the bearing flange can be easily aligned with the rotor shaft.
[0017] In an advantageous embodiment, the axis of rotation of the rotor shaft is aligned coaxially with the rotational symmetry axis of the first centering collar and / or with the ring axis of the first centering collar.
[0018] The advantage here is that the bearing flange can be easily aligned to the rotor shaft.
[0019] In an advantageous embodiment, the rotational axis of the rotor shaft is coaxial with the rotational axis of the bearing. This is advantageous because the rotor shaft can be rotatably mounted by means of the bearing.
[0020] In an advantageous embodiment, a shaft seal is accommodated in the bearing flange, which seals against the rotor shaft, in particular with the shaft seal being arranged on the side axially facing away from the stator housing. This is advantageous in that increased sealing can be achieved.
[0021] In an advantageous embodiment, a pinion is connected to the rotor shaft in a rotationally fixed manner, which pinion meshes with a face-toothed gear, in particular with the rotational axis of the gear aligned perpendicular to the rotational axis of the rotor shaft, and the pinion has a worm gear, in particular a ZA worm gear. The advantage here is that the pinion is simple and cost-effective to manufacture.
[0022] In an advantageous embodiment, the gear has teeth that extend in an arc-shaped manner from the radially inner to the radially outer in the circumferential direction, particularly where the gear is a Spiroplan gear. This is advantageous in that a high gear ratio can be achieved.
[0023] In an advantageous embodiment, the wheel is connected to another gear, which meshes with a third gear connected to the output shaft of the transmission, or with a fourth gear connected to the output shaft of the transmission. The advantage here is that even higher gear ratios can be achieved by adding additional gear stages.
[0024] In an advantageous embodiment, the housing part is manufactured as a cast part, with a channel extending through the wall of the housing part being formed by means of a slide, the drawing direction of which forms a non-negligible angle, in particular an angle between 10° and 40°, to the rotational axis of the rotor shaft. This is advantageous in that the housing part has increased stability and rigidity on the input side. Furthermore, the rotor shaft with the pinion protrudes through the channel into the interior of the gearbox, so that the gear, which is arranged in the interior area of the gearbox, engages with the pinion.
[0025] In an advantageous design, the rotor shaft with the pinion extends into the channel or through it. The advantage here is that the pinion is located predominantly within the channel, thus efficiently utilizing the installation space.
[0026] In an advantageous embodiment, the wheel's axis of rotation is aligned perpendicular to the rotor shaft's axis of rotation. The advantage here is that the input gear stage is an angular gear stage.
[0027] In an advantageous embodiment, the wheel's axis of rotation has a non-negligible center distance from the rotor shaft's axis of rotation. This is advantageous because a high gear ratio can be achieved.
[0028] In an advantageous embodiment, the first centering collar is aligned parallel to the second centering collar, in particular with the rotational symmetry axis of the first centering collar aligned parallel to the rotational symmetry axis of the second centering collar. Advantageously, the ring axes of the two ring-shaped centering collars are aligned parallel to each other but spaced apart. This allows a high gear ratio to be achieved and manufactured in a simple and cost-effective manner.
[0029] In an advantageous embodiment, the first and second cheeks of the bearing flange are connected by means of ribs formed on the web of the bearing flange, in particular wherein the ribs are spaced apart from one another in the circumferential direction, in particular with respect to the axis of rotation of the rotor shaft, in particular are evenly spaced, in particular wherein the outermost radial distance of the respective rib, measured in particular at a respective axial position, in particular with respect to the axis of rotation of the rotor shaft, decreases monotonically, in particular strictly monotonically, with increasing axial distance from the stator housing, in particular wherein at least two ribs have a different extent in the radial direction and / or wherein the extent of the ribs in the radial direction is a non-constant function of the circumferential angle,In particular, at a given circumferential angle, the radial distance area covered by the respective rib in the radial direction borders the radial distance area covered by the web. The advantage here is that the bearing flange has increased rigidity and improved heat dissipation, particularly of the bearing's lost heat. However, the different lengths also suppress resonant vibrations. This is because the ribs of different lengths are distributed around the circumference, thus forming unevenly distributed ribs around the circumference, so that corresponding natural vibrations or resonant vibrations are suppressed.
[0030] In addition, the stability is increased in that respective ribs from the motor to the gearbox, in particular from the first cheek to the second cheek, have a maximum radial distance which decreases with increasing axial distance to the stator housing, in particular wherein the radial distance is related to the axis of rotation of the rotor shaft.
[0031] Important features of the method for producing variants of a series of geared motors are that a first or a second bearing flange is selectively selected from a modular system and connected to a housing part of the modular system and a stator housing of the modular system, wherein when the first bearing flange is selected as the first variant, an aforementioned geared motor is produced, wherein when the second bearing flange is selected as the second variant, a geared motor is produced which has a lower transmission ratio than the aforementioned geared motor.
[0032] The advantage is that a high variance of the series can be achieved with a small number of parts.
[0033] In an advantageous embodiment, the second bearing flange has a motor-side drilling pattern, in particular on its side facing away from the housing part of the gearbox, a motor-side drilling pattern, in particular for first fastening elements connecting the stator housing to the bearing flange, in particular screws, wherein the second bearing flange has a gearbox-side drilling pattern, in particular on its side facing away from the stator housing, a gearbox-side drilling pattern, in particular for further fastening elements connecting the housing part of the gearbox to the second bearing flange
[0034] Fastening elements, in particular further screws, wherein the motor-side drilling pattern of the second bearing flange has a discrete or integer rotational symmetry axis which is coaxial to a discrete or integer rotational symmetry axis of the gearbox-side drilling pattern.
[0035] The advantage here is that the second bearing flange can be used instead of the first bearing flange, thus allowing a lower gear ratio to be achieved.
[0036] In an advantageous embodiment, the second bearing flange has a first cheek and a second cheek connected to the first cheek via a web, in particular wherein the second cheek is arranged on the side of the web axially facing away from the stator housing and the first cheek is arranged on the side axially facing away from the housing part of the gearbox, wherein the axial direction is aligned parallel to the axis of rotation of the rotor shaft, wherein the first cheek is centered to the stator housing via a first centering collar, wherein the first centering collar is formed on the first cheek or on the stator housing, wherein the second cheek is centered to the housing part of the gearbox via a second centering collar, wherein the second centering collar is formed on the second cheek or on the housing part of the gearbox,
[0037] - wherein the first centering collar has a rotational symmetry axis which is coaxially aligned with a rotational symmetry axis of the second centering collar and / or wherein the first centering collar is designed as a continuous or interrupted
[0038] circular ring, the ring axis of which is coaxially aligned with the ring axis of the second centering collar formed as a continuous or interrupted circular ring, in particular wherein the first centering collar is formed as a hollow cylinder and the second centering collar is formed as a further hollow cylinder.
[0039] The advantage here is that a variant with a higher or lower gear ratio is available.
[0040] The advantage here is that the second bearing flange can be used optionally instead of the first bearing flange, thus achieving a lower transmission ratio. Further advantages arise from the subclaims. The invention is not limited to the combination of features of the claims. Those skilled in the art will recognize further possible combinations of claims and / or individual claim features and / or features of the description and / or the figures, in particular from the task and / or the task posed by comparison with the prior art.
[0041] The invention will now be explained in more detail using schematic illustrations:
[0042] Figure 1 shows a gear motor according to the invention in longitudinal section.
[0043] Figure 2 shows a bearing flange 2 of the motor from an oblique view.
[0044] In Figure 3, the bearing flange 2 is shown in an oblique view from a different viewing direction.
[0045] Figure 4 shows the bearing flange 2 in side view.
[0046] Figure 5 shows the bearing flange 2 in cross section.
[0047] As shown in the figures, the inverter motor has a rotor shaft which is rotatably mounted via a first bearing 8 and a further bearing.
[0048] The first bearing 8 is accommodated in a bearing flange 2.
[0049] The bearing flange 2 has a first cheek 40 and a second cheek 41, which are connected via a web 42.
[0050] The first bearing 8 is accommodated in the bearing flange 2, in particular radially inside the web 42, wherein the axis of rotation of the first bearing 8 is aligned coaxially to the axis of rotation of the rotor shaft 9.
[0051] The first cheek 40 is connected to a stator housing 1 on its side facing the rotor shaft 9, with a first centering collar 7 formed on the first cheek 40 or alternatively on the stator housing 1. The first centering collar 7 is circularly cylindrical in shape, i.e., has a circular cylinder section, in particular a section of a hollow circular cylinder. The first centering collar 7 is aligned coaxially with the rotor shaft 9.
[0052] In particular, the cylinder axis and / or rotational symmetry axis of the centering collar 7 is aligned coaxially with the rotational axis of the rotor shaft 9, in particular it coincides with it and / or is identical or equal to it.
[0053] The second cheek 41 is connected to a housing part 3 of the transmission on its side facing away from the rotor shaft 9, with a second centering collar 10 formed on the second cheek 41 or alternatively on the housing part 3. This second centering collar 10 is also circularly cylindrical in shape, i.e., has a circular cylinder section, in particular a section of a hollow circular cylinder. However, the associated cylinder axis, i.e., the rotational symmetry axis of the second centering collar 10, is aligned parallel to the axis of rotation of the rotor shaft 9 and spaced from this axis of rotation of the rotor shaft 9.
[0054] The bearing flange 2 is connected to the stator housing 1 by means of screws screwed into first holes or tie rods are used to hold the housing parts of the motor together, which are passed through first holes,
[0055] In any case, the rotational symmetry axis of the hole pattern of the first holes is coaxial and concentrically aligned to the rotational axis of the rotor shaft 9.
[0056] The hole pattern 6 of the second screws, which connect the bearing flange 2 to the housing part 3 of the gearbox, has a rotational symmetry axis which is spaced from the rotational axis of the rotor shaft 9 and aligned parallel to it.
[0057] Thus, the rotor shaft 9 protrudes off-center and / or eccentrically from the bearing flange 2 into the gearbox on the gearbox side.
[0058] The rotor shaft 9 projects through a continuous stepped bore, in particular a bearing receiving bore, in the bearing flange 2, wherein the bearing, in particular the outer ring of the first bearing, is accommodated axially in front of the step and a shaft sealing ring is accommodated axially after the step, which seals off the rotor shaft 9. The pinion 5 has worm gearing, in particular ZA worm gearing, and is in engagement with the gearing of a face-toothed wheel 4. The teeth of the face-toothed wheel 4 run in an arc from radially inside to radially outside, i.e. with a circumferential angular position that progressively increases with increasing radial distance from the axis of rotation of the wheel 4.
[0059] There is a distance, in particular a non-vanishing distance, between the axis of rotation of the wheel 4 and the axis of rotation of the rotor shaft 9 and / or the pinion 5.
[0060] The axis of rotation of the wheel 4 is aligned perpendicular to the axis of rotation of the rotor shaft 9 and / or the pinion 5.
[0061] The transmission preferably has additional gear stages. In particular, a further gear is connected to gear 4 in a rotationally fixed manner and meshes with a third gear, which meshes with a fourth gear.
[0062] The inner wall of the stepped bore is aligned concentrically to the axis of rotation of the rotor shaft.
[0063] The rotor shaft 9, with the pinion 5 connected to it in a rotationally fixed manner, projects through an opening in the housing part 3 of the gearbox into the interior of the gearbox, which is at least partially filled with oil. This opening, this through opening shaped in particular as a channel, in particular a drawing channel, is created by drawing a slide during the casting production of the housing part 3. The drawing direction has a non-zero angle to the axis of rotation of the rotor shaft 9, in particular an angle between 10° and 40°. In this preferred angular range, the pinion 5 is sufficiently spaced from the material of the housing part 3, in particular from the channel wall, even when partially protruding into the interior of the gearbox.
[0064] As shown in Figures 2 to 4, ribs 20 are formed radially outside the web 42 on the bearing flange, connecting the first cheek 40 to the second cheek 41. The ribs 20 protrude radially from the web 42 and are spaced apart from each other in the circumferential direction. The ribs 20 are integrally formed on the web 42 and extend in the radial direction.
[0065] However, the ribs 20 are designed with different lengths in the radial direction. Thus, the maximum extension of the ribs 20, in particular the radial dimension, is a non-constant, and in particular, variable, function of the circumferential angle. This is particularly clearly visible in Figure 5.
[0066] As can be clearly seen in Figures 3 and 4, the ribs 20 run axially obliquely, since the motor-side drilling pattern of the bearing flange 2 is not concentric and / or coaxial with the gearbox-side drilling pattern.
[0067] Thus, the outermost radial distance of the respective rib 20 decreases monotonically, in particular strictly monotonically, with increasing axial distance from the stator housing 1.
[0068] In further embodiments according to the invention, in order to form a further variant of a geared motor, the bearing flange is replaced by a further bearing flange in which the centering collars 7 and 10 and the drilling patterns are all aligned rotationally symmetrically, in particular discretely rotationally symmetrically to the axis of rotation of the rotor shaft, in particular therefore also concentrically and / or coaxially.
[0069] Although there is still an axial offset, i.e. distance, between the axis of rotation of the rotor shaft 9 and the axis of rotation of the wheel 4, this is now much smaller and thus also the achievable maximum gear ratio of the gearbox.
[0070] In this way, different variants of a series can be manufactured using a small number of components. A high degree of variance can be achieved with this small number of components. For this purpose, two different bearing flanges 2 must be kept in stock. The first has a transmission-side bore pattern that is not concentric with the engine-side bore pattern, and the second has a transmission-side bore pattern that is concentric with the engine-side bore pattern. List of reference symbols
[0071] 1 Stator housing 2 Bearing flange
[0072] 3 Gearbox housing part
[0073] 4 wheel
[0074] 5 pinions
[0075] 6 Hole pattern for screws 7 First centering collar
[0076] 8 warehouses
[0077] 9 Rotor shaft
[0078] 10 second centering collar
[0079] 20 Rib 40 Cheek
[0080] 41 Cheek
[0081] 42 Steps
Claims
Patent claims:
1. Geared motor, comprising a gearbox and an electric motor, wherein the geared motor has a housing part of the gearbox, a bearing flange, a stator housing of the electric motor, a rotor shaft and a bearing, wherein the bearing is received in the bearing flange, wherein the inner ring of the bearing is placed on the rotor shaft, wherein the bearing flange has a motor-side drilling pattern, in particular a motor-side drilling pattern on its side facing away from the housing part of the gearbox, in particular for first fastening elements, in particular screws, connecting the stator housing to the bearing flange, wherein the bearing flange has a gearbox-side drilling pattern, in particular a gearbox-side drilling pattern on its side facing away from the stator housing, in particular for further fastening elements, in particular further screws, connecting the housing part of the gearbox to the bearing flange, characterized in that the motor-side drilling pattern has a rotational symmetry axis, in particular a discrete or integer rotational symmetry axis, which is parallel and spaced, in particular not coaxial, to a rotational symmetry axis, in particular to a discrete or integer rotational symmetry axis, of the transmission-side drilling pattern.
2. A geared motor comprising a gearbox and an electric motor, wherein the geared motor has a housing part of the gearbox, a bearing flange, a stator housing of the electric motor, a rotor shaft, and a bearing, wherein the bearing is received in the bearing flange, wherein the inner ring of the bearing is placed on the rotor shaft, wherein the bearing flange has a first cheek and a second cheek connected to the first cheek via a web, in particular wherein the second cheek is arranged on the side of the web axially facing away from the stator housing and the first cheek is arranged on the side axially facing away from the housing part of the gearbox, wherein the axial direction is aligned parallel to the axis of rotation of the rotor shaft, wherein the first cheek is centered to the stator housing via a first centering collar, wherein the first centering collar is formed on the first cheek or on the stator housing,wherein the second cheek is centered to the housing part of the transmission via a second centering collar, wherein the second centering collar is formed on the second cheek or on the housing part of the transmission, wherein the first centering collar has a rotational symmetry axis which is aligned parallel to and spaced from a rotational symmetry axis of the second, Centering collar and / or wherein the first centering collar is designed as a continuous or interrupted circular ring, the ring axis of which is spaced from the ring axis of the second ring formed as a continuous or interrupted circular ring Centering collar, in particular wherein the first centering collar is designed as a hollow cylinder and the second centering collar is designed as a further hollow cylinder.
3. Geared motor according to claim 1, characterized in that the axis of rotation of the rotor shaft is aligned coaxially to the discrete or integer rotational symmetry axis of the motor-side drilling pattern.
4. Geared motor according to claim 2, characterized in that the axis of rotation of the rotor shaft is aligned coaxially with the rotational symmetry axis of the first centering collar and / or with the ring axis of the first centering collar.
5. Geared motor according to one of the preceding claims, characterized in that the axis of rotation of the rotor shaft is coaxial with the axis of rotation of the bearing, and / or that a shaft sealing ring is accommodated in the bearing flange, which seals off the rotor shaft, in particular wherein the shaft sealing ring is arranged on the side axially facing away from the stator housing, in particular wherein the shaft sealing ring is arranged coaxially with the bearing.
6. Geared motor according to one of the preceding claims, characterized in that a pinion is rotationally connected to the rotor shaft, which pinion is in engagement with a face-toothed wheel, in particular wherein the axis of rotation of the wheel is aligned perpendicular to the axis of rotation of the rotor shaft, wherein the pinion has a worm gear, in particular a ZA worm gear.
7. Geared motor according to one of the preceding claims, characterized in that the wheel has teeth which extend in an arc shape from radially inside to radially outside in the circumferential direction, in particular wherein the wheel is a Spiroplan wheel.
8. Geared motor according to one of the preceding claims, characterized in that the wheel is connected to a further gear which is in engagement with a third gear which is connected to the output shaft of the gearbox or with a fourth gear which is connected to the output shaft of the gearbox.
9. Geared motor according to one of the preceding claims, characterized in that the housing part is manufactured as a cast part, wherein a channel passing through the wall of the housing part is manufactured by means of a slide, the drawing direction of which has a non-zero angle, in particular an angle between 10° and 40°, to the axis of rotation of the rotor shaft.
10. Geared motor according to one of the preceding claims, characterized in that the rotor shaft with the pinion projects into the channel or through the channel.
11. Geared motor according to one of the preceding claims, characterized in that the axis of rotation of the wheel is aligned perpendicular to the axis of rotation of the rotor shaft, and / or that the axis of rotation of the wheel has a non-zero axial distance from the axis of rotation of the rotor shaft.
12. Geared motor according to one of the preceding claims, characterized in that the first centering collar is aligned parallel to the second centering collar, in particular wherein the rotational symmetry axis of the first centering collar is aligned parallel to the rotational symmetry axis of the second centering collar, and / or that the first and second cheeks of the bearing flange are connected by means of ribs formed on the web of the bearing flange, in particular wherein the ribs are spaced apart from one another in the circumferential direction, in particular with respect to the axis of rotation of the rotor shaft, in particular are evenly spaced, in particular wherein the outermost radial distance of the respective rib, measured in particular at a respective axial position, in particular with respect to the axis of rotation of the rotor shaft, decreases monotonically, in particular strictly monotonically, with increasing axial distance from the stator housing,in particular wherein at least two ribs have a different extent in the radial direction and / or wherein the extent of the ribs in the radial direction is a non-constant function of the circumferential angle, in particular wherein, at a respective circumferential angle, the radial distance region covered by the respective rib in the radial direction adjoins the radial distance region covered by the web.
13. A method for producing variants of a series of geared motors, wherein a first or a second bearing flange is selectively selected from a modular system and connected to a housing part of the modular system and to a stator housing of the modular system, wherein when the first bearing flange is selected as the first variant, a geared motor according to one of the preceding claims is produced, wherein when the second bearing flange is selected as the second variant, a geared motor is produced which has a lower transmission ratio than a geared motor according to one of the preceding claims.
14. Method according to one of the preceding claims, characterized in that the second bearing flange has a motor-side drilling pattern, in particular a motor-side drilling pattern on its side facing away from the housing part of the gearbox, in particular for first fastening elements, in particular screws, connecting the stator housing to the bearing flange, wherein the second bearing flange has a gearbox-side drilling pattern, in particular a gearbox-side drilling pattern on its side facing away from the stator housing, in particular for further fastening elements, in particular further screws, connecting the housing part of the gearbox to the second bearing flange, wherein the motor-side drilling pattern of the second bearing flange has a discrete or integer rotational symmetry axis which is coaxial with a discrete or integer rotational symmetry axis of the gearbox-side drilling pattern.
15. The method according to claim 13, characterized in that the second bearing flange has a first cheek and a second cheek connected to the first cheek via a web, in particular wherein the second cheek is arranged on the side of the web axially facing away from the stator housing and the first cheek is arranged on the side axially facing away from the housing part of the gearbox, wherein the axial direction is aligned parallel to the axis of rotation of the rotor shaft, wherein the first cheek is centered to the stator housing via a first centering collar, wherein the first centering collar is formed on the first cheek or on the stator housing, wherein the second cheek is centered to the housing part of the gearbox via a second centering collar, wherein the second centering collar is formed on the second cheek or on the housing part of the gearbox, - wherein the first centering collar has a rotational symmetry axis which is coaxially aligned with a rotational symmetry axis of the second centering collar and / or wherein the first centering collar is designed as a continuous or interrupted circular ring, the ring axis of which is coaxially aligned with the ring axis of the second centering collar formed as a continuous or interrupted circular ring, in particular wherein the first centering collar is formed as a hollow cylinder and the second centering collar is formed as a further hollow cylinder.