Housing for a drive device for driving a belt support means of an elevator system

Abstract

The following embodiments relate to a drive device (6) having a housing (11) with a first connection element (11.1), a second connection element (11.2), and two reinforcing struts (11.3); a motor (9) received on the first connection element (11.1); a brake (10) received on the second connection element (11.2); and a drive shaft (7) extending between the motor (9) and the brake (10), wherein a connection element (11.1, 11.2) is formed in two parts, i.e. a main part (12.1) and an adapter element (12.2) receiving the motor (9) or the brake (10), the adapter element (12.2) is held on the main part (12.1) for conjoint rotation therewith, the main part (12.1) and the adapter element (12.2) have recesses (18.1, 18.2) for receiving pins (19) for producing a formfitting connection, and the recesses (18.1, 18.2) are provided in a region for receiving the motor (9) or the brake (10) such that the recesses (18.1, 18.2) are covered when the motor (9) or the brake (10) is received.

Description

[0001] TD41899 - 1 - August 2025

[0002] Housing for a drive device for driving a belt support system of an elevator system

[0003] Technical field

[0004] The following descriptions relate to a drive device for driving at least one belt support element of an elevator system, comprising a housing, comprising a first connection element for receiving a motor of the drive device on the housing, a second connection element for receiving a brake of the drive device on the housing, and at least two stiffening struts extending longitudinally between the first connection element and the second connection element for surrounding a drive shaft of the drive device extending between the motor and the brake, wherein the drive device further comprises a motor received on the first connection element, a brake received on the second connection element, and a drive shaft extending between the motor and the brake for receiving and driving the at least one belt support element.

[0005] Technical background

[0006] Elevator systems for transporting people and / or goods are an integral part of modern residential and commercial buildings. A typical elevator system comprises one or more elevator shafts, in each of which one or more cars are moved between landing positions by means of drives such as suspension drives.

[0007] In such elevator systems, it is known that the load-bearing elements are designed as belt load-bearing elements. Furthermore, it is known that in a drive device of the elevator system, the belt load-bearing elements each bear against drive zones of a drive shaft, wherein the drive shaft is connected or connectable to a motor on a first side and to a brake on a second side, and wherein the TD41899 - 2 - August 2025

[0008] Drive zones extend between the motor and the brake. The drive device then typically has a housing that serves, on the one hand, to ensure the arrangement of the motor, the brake, and the drive shaft relative to each other, as well as the transmission of force and torque between these components, and on the other hand, to fix the components to the elevator shaft.

[0009] A disadvantage of known housing designs is their relatively complex geometry, making them relatively difficult to manufacture. Another disadvantage is that, depending on the design of the connection between the motor or brake and the housing, individual housing geometries must be manufactured and / or kept in stock for different motors or brakes.

[0010] Description - Technical Solution

[0011] Based on this situation, the task at hand is to reduce the manufacturing effort and / or simplify the warehousing of a drive device as described above.

[0012] The present problem is solved by the features of the independent claims. Advantageous embodiments are specified in the dependent claims, the description, and the drawings. Where technically feasible, the teachings of the dependent claims can be combined arbitrarily with those of the main and dependent claims.

[0013] In particular, the problem is solved by a drive device for driving at least one belt support element of an elevator system, comprising a housing, comprising a first connection element for receiving a motor of the

[0014] The drive device comprises a drive element on the housing, a second connection element for receiving a brake of the drive device on the housing, and at least two stiffening struts extending longitudinally between the first and second connection elements for surrounding a drive shaft of the drive device extending between the motor and the brake. The drive device further comprises: a motor received on the first connection element, a brake received on the second connection element, and a drive shaft extending between the motor and the brake for receiving and driving the at least one belt support, wherein at least one connection element is divided into two parts: a base body and an adapter element formed separately from the base body for receiving the motor or brake.the brake is designed, wherein the adapter element is held non-rotatably on the base body, wherein the base body and the adapter element have recesses for receiving pins to create a positive connection with each other, and wherein the recesses are arranged in an area for receiving the motor or the brake, such that the recesses are covered by the motor or the brake when the motor or brake is received.

[0015] The following sections explain advantageous aspects and subsequently describe preferred modified embodiments. Explanations, particularly regarding advantages and definitions of features, are essentially descriptive and preferred, but not limiting, examples. If an explanation is limiting, this will be explicitly stated.

[0016] Where ordinal numbers, for example "first," "second," etc., are used, for instance to designate a component, an element, a process step, or a process action, these ordinal numbers are solely for differentiation in the designation and do not indicate any dependencies or sequences. This means, in particular, that a device does not need to have a "first component" to have a "second component." A device can also have a "first component" and a "third component" without necessarily having a "second component." Multiple units with the same ordinal number are also possible, for example, multiple "first components."

[0017] According to the present understanding, an elevator system is designed, for example, with at least one vertical elevator shaft and at least one car, but can also have several parallel elevator shafts and / or several cars, in particular several cars in one elevator shaft. A car is held on a first side of a drive device by a suspension element and driven via the suspension element, the drive device transmitting the drive torque to the suspension element via the drive shaft. The suspension element is further preferably connected on a second side of the drive device by means of the suspension element to a TD41899 - 4 - August 2025

[0018] A counterweight is connected. A drive device is located, for example, in a machine room above the elevator shaft(s) or preferably in an upper section of an elevator shaft, the so-called shaft head. The load-bearing element(s) is / are designed as a belt load-bearing element, i.e., with a flat cross-section and a flat or contoured force transmission surface, and carries / carry tensile loads in the direction of its / their longitudinal extent. Such belt load-bearing elements are also referred to as load-bearing belts and comprise, for example, several steel cables arranged side by side, enclosed in a common rubber sheath. Several load-bearing elements can be provided in the elevator system, for example, to increase the load-bearing capacity or for redundancy.An elevator shaft is a continuous shaft that extends over several floors of a building and has a cross-section designed for the passage of the elevator car.

[0019] In a drive mechanism, a housing serves to hold the individual components together and in relation to the elevator shaft, and to transmit power between the components and to the elevator shaft. Furthermore, the housing can serve to protect individual components, for example, by at least partially enclosing them. This protection then exists, for instance, at least partially against the ingress of objects or liquids into the drive zone(s). However, according to the present understanding, the housing does not necessarily form a complete enclosure or housing of the components, and in particular, not a complete enclosure or housing of all components.

[0020] A connecting element is, for example, designed as a flat and / or cubic body and has fastening devices such as bores or recesses and / or projections for attaching the motor or brake – the motor or brake is thus connected to the connecting element or, via the connecting element, to the drive device. Furthermore, each connecting element has, in particular, a through-hole for the drive shaft and, when the drive device is assembled, completely surrounds the drive shaft.

[0021] A stiffening strut is, for example, rod-shaped or designed as a flat body and arranged between the connecting elements such that the belt support elements located at the drive zones pass over the stiffening struts without contact during operation of the elevator system (TD41899 - 5 - August 2025). The connecting elements are dimensioned and designed accordingly so that the stiffening struts arranged on them lie outside the guide planes of the belt support element(s). If the stiffening strut is intended to surround the drive shaft, it is arranged in the circumferential region of the drive shaft and radially spaced from it. The stiffening strut preferably has a torsionally rigid cross-section, in particular a torsionally rigid profile cross-section.

[0022] Insofar as components of the housing, the drive device or the elevator system are designed separately from one another, they are each manufactured as a single part, and insofar as a connection exists between two separate components, this connection was created after the individual components had been manufactured, for example by positive locking, by screwing, by joining or other types of connection.

[0023] Insofar as the housing components are rotationally fixed to one another, the connection allows torque transmission from one component to another without the connection loosening or failing under the transmission of design torques. A torque acts, in particular, around the longitudinal direction or axis of the drive shaft, or in the circumferential direction with respect to a cylindrical coordinate system defined by the drive shaft. The longitudinal direction is parallel to the axis of the drive shaft. Thus, for example, if the drive shaft is driven by the motor and set into rotation relative to the stationary housing, the motor is supported against the first connecting element or an adapter element of the first connecting element.The support moment is then transferred, for example, from the first connection element to the stiffening struts and the second connection element, and dissipated at the second connection element into a wall of the elevator shaft, if the housing – purely for example – is connected to the elevator shaft at the second connection element. Insofar as reference is made to a cylindrical coordinate system in relation to the drive device or the housing in the present disclosure, this coordinate system is or refers to a coordinate system defined by the drive shaft.

[0024] The previously described solution to the problem with the drive device now comprises the teaching that the motor or brake is mounted on an adapter element designed to suit the respective motor or brake, TD41899 - 6 - August 2025, wherein adapter elements for different motors or brakes are mounted on the base body of the housing's connection element in the same way. The housing or base body of the connection element is thus designed identically, regardless of the type or model of the motor or brake, and can therefore be manufactured in a standardized manner without individual adaptation to different motors / brakes and kept in stock as a single version. Furthermore, it is advantageously achieved that the adapter element is independent of the rest of the housing or brake.The drive unit can be manufactured separately from the rest of the drive unit and, for example, can be clamped into suitable machines as a significantly smaller and more compact component compared to the entire drive unit during machining. This eliminates the need for the complex machining of a connection for the motor or brake on the drive unit as a whole. Overall, the drive unit is simple and inexpensive to manufacture, with the housing, apart from the adapter element(s), being a single, identical part regardless of the motor or brake used. Consequently, the drive unit also advantageously allows for simple housing storage.

[0025] The solution to the problem with the aforementioned drive device further comprises the teaching that a pin inserted into the recesses simultaneously engages the adapter element and the base body with a corresponding fit in order to position the adapter element on the base body and to achieve a positive connection sufficient for torque transmission. Furthermore, the pins are advantageously secured in the recesses by the motor or brake when the motor or brake is installed, respectively, due to the overlapping of the recesses.

[0026] In particular, the drive shaft has at least one drive zone extending between the motor and the brake, on which the at least one belt support element is mounted, guided, and driven. The at least one drive zone is, for example, slightly convex. Specifically, one drive zone is arranged on the drive shaft for each belt support element of the associated elevator car.

[0027] Alternatively or additionally, the base body can be provided with a round receiving geometry, with the adapter element resting against the round receiving geometry via a round recess. This geometry engages the arrangement of TD41899 - 7 - August 2025

[0028] The connecting element is positioned around the drive shaft. In particular, the round receiving geometry is arranged concentrically with a through-passage through the base body for the drive shaft to pass through the base body, for example as a ring or collar at this through-passage. This advantageously creates a compact and simply designed base body or a compact and simply designed connecting element.

[0029] Alternatively or additionally, the adapter element can be positively engaged with the base body. A positive engagement advantageously allows for the reliable and wear-free transmission of relatively high torques between the adapter element and the base body and is also simple to achieve during housing assembly without additional tools. Alternatively, the adapter element can be joined to the base body, in particular by welding, or otherwise by a material-fit or force-fit connection to create a sufficiently rotationally rigid connection between the base body and the adapter element.

[0030] Alternatively or additionally, the base body may have at least one projection extending longitudinally or radially to the longitudinal direction, and the adapter element may have at least one recess corresponding to the projection. Alternatively, the adapter element may have at least one projection extending longitudinally or radially to the longitudinal direction, and the base body may have at least one recess corresponding to the projection. The adapter element and the base body can then be aligned, for example, by sliding them together longitudinally during housing assembly. Further means or devices for securing the adapter element to the base body may be provided, such as locking elements or recesses for receiving fasteners. In this way, a secure, positive-locking connection between the adapter element and the base body can be easily achieved to prevent rotation.

[0031] Alternatively or additionally, the projection and recess can be formed on the circular receiving geometry of the base body and the circular recess of the adapter element. For example, several projections or recesses are distributed around the circumference of the circular receiving geometry and the circumference of the circular recess, for example, two or four projections or recesses. In this way, a favorable and simple moment transfer between the TD41899 - 8 - August 2025

[0032] adapter element and the base body, which also specifies an alignment and centering of the adapter element on the base body.

[0033] Alternatively or additionally, the recesses can be designed to extend longitudinally. Extending them longitudinally allows for optimal force transmission between the adapter element, the pin, and the base body, thus maximizing the torque that can be transmitted via the pin. Furthermore, the longitudinal extension facilitates easy insertion of the pins into the recesses after the adapter element has been positioned on the base body.

[0034] Alternatively or additionally, the adapter element can be provided with a friction surface for interaction with a brake element of the brake when braking the drive shaft. When the brake element contacts the friction surface, it then creates a frictional connection between the drive shaft and the housing via the friction element and the adapter element, thus braking the drive shaft. The braking torque is then transmitted via the housing, in particular to the elevator shaft. Advantageously, the adapter element can be designed and / or machined independently of the base body or the rest of the housing to form the friction surface. For example, the adapter element is made of a different material than the base body, or the adapter element has a different surface finish on its friction surface than the base body, in particular a surface finish achieved through individual machining operations.Furthermore, the friction surface can be advantageously adapted in its dimensions and further design to a particular type of brake without changing the rest of the housing.

[0035] Alternatively or additionally, the base body and the adapter element can be made of different materials. The material of the base body and the adapter element can then be tailored to the specific component requirements, with the material being selected based on further aspects, such as material costs.

[0036] Alternatively or additionally, the base body can be designed as a casting. The base body can then be manufactured particularly easily and cost-effectively (TD41899 - 9 - August 2025), especially if it is integrally formed with the other components of the housing. Standardizing the base body means that a corresponding casting tool is only required once or in one version. Advantageously, the adapter element can be manufactured independently of the casting and thus independently of the tolerances inherent in the casting.

[0037] Alternatively or additionally, the adapter element may be provided with a hole pattern for mounting the motor or brake by means of connecting elements that pass through the holes in the hole pattern. The motor or brake is then particularly easy to mount on the adapter element, whereby the hole pattern can be tailored to a specific type of motor or brake or can be designed for several different motors or brakes. In particular, screws are provided as connecting elements, so that a force-fit connection is established between the adapter element and the motor or brake. Furthermore, the holes and the connecting elements accommodated therein extend in the longitudinal direction, so that the connecting elements are conveniently positioned on the housing and a connection suitable for torque transmission between the motor or brake and the adapter element is created.Preferably, the holes of the hole pattern remain accessible from a side of the adapter element facing away from the motor or brake when the adapter element is mounted on the base body.

[0038] The problem is further solved by an elevator system comprising at least one elevator shaft, at least one car movable along the elevator shaft, at least one belt drive for holding and propelling the car, and at least one drive device according to the solution to the problem described above for driving the at least one belt drive. The elevator system achieves the advantages of the solutions to the problem described above with the drive device. In particular, the elevator system is simple and inexpensive to manufacture, and the housing can be easily stored or kept on hand during production. TD41899 - 10 - August 2025

[0039] Brief description of the drawings

[0040] A preferred technical solution is explained in more detail below with reference to the accompanying drawings and preferred embodiments. The term "figure" is abbreviated as "Fig." in the drawings.

[0041] The drawings show

[0042] Fig. 1 shows a schematic view of an elevator system according to one embodiment;

[0043] Fig. 2 shows a schematic sectional view of a drive device for an elevator system according to Fig. 1;

[0044] Fig. 3a shows a perspective detail view of a housing in exploded view of a drive device according to Fig. 2 in a first embodiment;

[0045] Fig. 3b shows a perspective detail view of the housing according to Fig. 3a in its assembled state;

[0046] Fig. 4a shows a perspective detail view of a housing in exploded view of a drive device according to Fig. 2 in a second embodiment;

[0047] Fig. 4b shows a perspective detail view of the housing according to Fig. 4a in its assembled state;

[0048] Detailed description of the drawings

[0049] The described embodiments are merely examples that can be modified and / or supplemented in various ways within the scope of the claims. Each feature described for a particular embodiment can be used independently or in combination with other features in any other embodiment. Each feature described for an embodiment of a particular claim category can also be used accordingly in an embodiment of a different claim category. TD41899 - 11 - August 2025

[0050] Figure 1 shows an elevator system 1 with a vertical elevator shaft 2 and a car 3 that travels in the elevator shaft 2. The car 3 is suspended from belts 4, which are guided over several deflection elements 5 and a drive shaft 7 of a drive unit 6. The drive unit 6 is located in a shaft head 2.1 of the elevator shaft 2 and is attached to the ceiling of the elevator shaft 2 in a manner not shown in detail. A counterweight 8 is also suspended from the belts 4 and moves in the opposite direction to the car 3 in the elevator shaft 2.

[0051] Figure 2 shows the drive device 6 in detail in a cross-sectional view. The drive shaft 7 has a first end 7.1, by means of which the drive shaft 7 is connected to a motor 9 in a torque-resistant manner or can be connected to a motor 9 in a torque-resistant manner by means of a coupling (not shown). The motor 9 is preferably designed as an electric machine. The drive shaft 7 also has a second end 7.2, by means of which the drive shaft 7 is connected to a brake 10 in a torque-resistant manner. Between the motor 9 and the brake 10, several drive zones 7.3 are formed on the drive shaft 7, on which three belt support elements 4 of the car 3 (not shown in Figure 2) are received, held, and / or driven or braked. In the embodiment according to Figure 2, three drive zones 7 are shown by way of example.3 for three parallel belt support elements 4 on the drive shaft 7, wherein the length of the drive shaft 7 in a longitudinal direction L is determined by the number of drive zones 7.3. The number of belt support elements 4 required and to be accommodated on the drive shaft 7 is determined, for example, by the permissible maximum weight of the car 3 and the load-bearing capacity of a single belt support element 4 and / or by required redundancies.

[0052] The drive device 6 further comprises a housing 11 with a first connection element 11.1 for receiving the motor 9, a second connection element 11.2 for receiving the brake 10, and at least two stiffening struts 11.3 extending in the longitudinal direction L between the first connection element 11.1 and the second connection element 11.2. The connection elements 11.1 and 11.2 are shown here as plates, but can also have any other shape and are preferably designed as castings. The stiffening struts 11.3 surround the drive shaft 7 and extend parallel to it in the longitudinal direction L. The longitudinal direction L corresponds to the axial extent of the drive shaft 7. TD41899 - 12 - August 2025

[0053] Housing 11 serves to accommodate all further components of the drive device 6, i.e. the motor 9, the brake 10 and the drive shaft 7, and is connected to the ceiling of the elevator shaft 2 in a manner not shown in detail, for example by screwing the first connecting element 11.1, the second connecting element 11.2 and / or at least one stiffening strut 11.3 to the ceiling.

[0054] Figures 3a and 3b show a first embodiment of the housing 11 in a detailed view, showing two stiffening struts 11.3 and the second connecting element 11.2 for receiving the brake 10, which is connected to the stiffening struts 11.3. The second connecting element 11.2 is formed from a base body 12.1 and an adapter element 12.2, wherein the connecting element 12.1 and the adapter element 12.2 are designed as two separate components, as shown in the exploded view of Figure 3a. The base body 12.1 is annular and has an internal through-pass 13 in a radial direction R for guiding the drive shaft 7. The base body 12.1 can, for example, be cast already in its annular shape with the through-pass 13 (and machined accordingly), or the through-pass 13 can be formed, for example, as a bore in a previously cast solid body.

[0055] Base body 12.1 is formed. Facing away from the through-hole 13, or, in the case of the assembled drive device 6, from the drive shaft 7, the base body 12.1 has a round receiving geometry 14 which corresponds to a round recess 15 of the adapter element 12.2, so that the round recess 15 can be slid onto the round receiving geometry 14 with a fit. Feet 16 are also formed on the base body 12.1, which serve, in a manner not shown in detail, to fasten the housing 11 to the elevator shaft 2.

[0056] The adapter element 12.2 is formed with a round recess 15 on one side and a radially outward, essentially rectangular outer contour 17 on the other. The adapter element 12.2 also has recesses 18.1 which, in the assembled state, align with recesses 18.2 on the base body 12.1 and serve to receive pins 19. In the assembled state of the housing 11, the pins 19 form a positive connection between the adapter element 12.2 and the base body 12.1 for rotationally fixed retention and are, in particular, covered by the mounted brake 10 and thus in the TD41899 - 13 - August 2025

[0057] Recesses 18.1 and 18.2 are secured. The adapter element 12.2 further comprises holes 20 of a hole pattern, the holes 20 projecting beyond the base body 12.1 in the assembled state of the connecting element 11.3 and thus remaining accessible. Fasteners, in particular screws, are arranged in the longitudinal direction L at the holes 20 for securing the brake 10. The hole pattern, and thus also the further dimensions of the adapter element 12.2, are adapted to a specific type of brake 10. The outer surface of the adapter element 12.2 in the longitudinal direction L is also designed as a friction surface 22 for interaction with a brake body of the brake 10, which is not shown in detail.

[0058] Figures 4a and 4b show a second embodiment of the housing 11 in a detailed view, wherein the housing 11 of the second embodiment corresponds in most features to the housing of the first embodiment shown in Figures 3a and 3b. A repetitive description of these features is omitted. In addition to the housing 11 according to Figures 3a and 3b, the base body 12.1 in the second embodiment has four projections 21.1 extending radially in the direction R on the circular receiving geometry 14, distributed around its circumference, wherein the adapter element 12.2 has corresponding recesses 21.2 radially inside the circular recess 15. The projections 21.1 and the recesses 21.2 form a positive fit in the circumferential direction when the housing 11 is mounted, as shown in Figure 4b, so that a rotationally fixed connection is created between the adapter element 12.2 and the base body 12.1.Additional pins 19 can then be inserted into the recesses 18.1, 18.2 to create a further positive fit between adapter element 12.2 and base body 12.1; however, such pins 19 can also be omitted.

[0059] The embodiment of the second connecting element 11.2 shown in Figures 3a to 4b can be provided in the same or corresponding manner on the first connecting element 11.1 for receiving the motor 9. Furthermore, the projections 21.1 and the recesses 21.2 can be interchanged in the same manner and with the same effect, i.e., projections on the round recess 15 of the adapter element 12.2 and recesses 21.2 on the round receiving geometry 14 of the base body 12.1. TD41899 - 14 - August 2025

[0060] Reference symbol list

[0061] 1 elevator system

[0062] 2 elevator shafts

[0063] 2.1 Shaft head of the elevator shaft

[0064] 3 elevator car

[0065] 4 belt support devices

[0066] 5 Deflection devices

[0067] 6 Drive device

[0068] 7 Drive shaft of the drive device

[0069] 7.1 First end of the drive shaft

[0070] 7.2 Second end of the drive shaft

[0071] 7.3 Drive zone of the drive shaft

[0072] 8 Counterweight

[0073] 9 Motor of the drive device

[0074] 10 Brake of the drive device

[0075] 11 Housing of the drive device

[0076] 11.1 First connection element of the housing

[0077] 11.2 second connection element of the housing

[0078] 11.3 Housing stiffening strut

[0079] 12.1 Base body of the connection element

[0080] 12.2 Adapter element of the connection element

[0081] 13. Passage of the base body

[0082] 14 round recording geometry of the base body

[0083] 15 round recess of the adapter element

[0084] 16 feet of the base body

[0085] 17 rectangular outer contour of the adapter element

[0086] 18.1 Recess on the adapter element

[0087] 18.2 Recess on the base body

[0088] 19 pens

[0089] 20 holes of a hole pattern

[0090] 21.1 lead

[0091] 21.2 Exclusion TD41899 - 15 - August 2025

[0092] 22 Friction surface of the adapter element

[0093] L Longitudinal direction

[0094] R radial direction

Claims

TD41899 - 16 - August 2025 Claims 1. Drive device (6) for driving at least one belt support element (4) of an elevator system (1), comprising a housing (11), comprising a first connection element (11.1) for receiving a motor (9) of the drive device (6) on the housing (11); a second connection element (11.2) for receiving a brake (10) of the drive device (6) on the housing (11); and at least two stiffening struts (11.3) extending in a longitudinal direction (L) between the first connection element (11.1) and the second connection element (11.2) for surrounding a drive shaft (7) of the drive device (6) extending between the motor (9) and the brake (10); a motor (9) received on the first connection element (11.1); a brake (10) received on the second connection element (11.2) a brake (10) mounted on the motor (9); and a drive shaft (7) extending between the motor (9) and the brake (10) for receiving and driving the at least one belt support element (4); wherein at least one connecting element (11.1, 11.2) is formed in two parts from a base body (12.1) and an adapter element (12.2) formed separately from the base body (12.1) for receiving the motor (9) or the brake (10), wherein the adapter element (12.2) is held non-rotatably on the base body (12.1); and wherein the base body (12.1) and the adapter element (12.2) have recesses (18.1, 18.2) for receiving pins (19) for establishing a positive connection with each other; characterized in that the recesses (18.1, 18.2) are arranged in an area for receiving the motor (9) or the brake (10), such that the recesses (18.1, 18.2) are covered by the motor (9) or the brake (10) when the motor (9) or brake (10) is received.

2. Drive device (6) according to claim 1, wherein the base body (12.1) has a round receiving geometry (14) and wherein the adapter element (12.2) abuts the round receiving geometry (14) with a round recess (15). TD41899 - 17 - August 2025 3. Drive device (6) according to claim 1 or 2, wherein the adapter element (12.2) is positively locked to the base body (12.1).

4. Drive device (6) according to claim 3, wherein the base body (12.1) has at least one projection (21.1) extending in the longitudinal direction (L) or radially to the longitudinal direction (L) and the adapter element (12.2) has at least one recess (21.2) corresponding to the projection (21.1); or the adapter element (12.2) has at least one projection (21.1) extending in the longitudinal direction (L) or radially to the longitudinal direction (L) and the base body (12.1) has at least one recess (21.2) corresponding to the projection (21.1).

5. Drive device (6) according to claim 4, wherein the projection (21.1) and the recess (21.2) are formed on the round receiving geometry (14) of the base body (12.1) and the round recess (15) of the adapter element (12.2).

6. Drive device (6) according to one of the preceding claims, wherein the recesses (18.1, 18.2) extend in the longitudinal direction (L).

7. Drive device (6) according to one of the preceding claims, wherein the adapter element (12.2) has a friction surface (22) for interacting with a brake body of the brake (10) when braking the drive shaft (7).

8. Drive device (6) according to one of the preceding claims, wherein the base body (12.1) and the adapter element (12.2) are made of different materials.

9. Drive device (6) according to one of the preceding claims, wherein the base body (12.1) is designed as a casting.

10. Drive device (6) according to one of the preceding claims, wherein the adapter element (12.2) has a hole pattern for receiving the motor (9) or the brake (10) by means of connecting means passing through holes (20) of the hole pattern. TD41899 - 18 - August 2025 11. Elevator system (1) comprising at least one elevator shaft (2); at least one car (3) movable along the elevator shaft (2); at least one belt support element (4) for holding and driving the car (3); and at least one drive device (6) according to one of the preceding claims for driving the at least one belt support element (4).

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