Door drive and door arrangement

Abstract

The present invention relates to a door drive (10), which is designed in particular as a direct drive for a pivot door. The door drive (10) has a housing (28) and an output shaft (26) which is designed to be coupled, preferably directly, to a door leaf (12) and to rotate about a rotational axis (20). Furthermore, the door drive (10) has an adjusting device (42) which is designed to adjust the output shaft (26) between an operating position and a mounting position relative to the housing (28) along the rotational axis (20). In the operating position, the output shaft (26) protrudes from the housing (28) beyond a first housing side (44). In the mounting position, however, the output shaft (26) is fully retracted into the housing (28) so that it no longer protrudes from the housing (28) beyond the first housing side (44).

Description

[0001] The present invention relates to a door drive for revolving doors, which is particularly suitable as a direct drive for pivot doors. Furthermore, the present invention relates to a door assembly for a revolving door, particularly in the form of a pivot door, in which the door drive according to the invention can be used.

[0002] In this context, a door drive configured as a "direct drive" refers to a door drive that engages directly with the door leaf, i.e., is directly coupled to the door leaf without any intermediate linkage. The direct drive design is preferred for the door drive according to the invention, although it can also be used in principle for revolving doors where the output shaft of the door drive is connected to the door leaf via a mechanical linkage.

[0003] The door drive according to the invention is particularly suitable for use in pivot doors. Accordingly, the door assembly according to the invention preferably comprises such a pivot door.

[0004] Pivot doors are a special type of revolving door. They differ from conventional revolving doors in that they rotate around a vertical axis, which is not created by a hinge located on the side of the door leaf, but is typically located near the center of the door leaf or asymmetrically arranged between the center and the side edges of the door leaf. In other words, the fittings or hinges on pivot doors are not attached to the side of the door leaf, but are usually embedded directly into the door leaf as a central or asymmetrical pivot point.

[0005] Pivot doors, by their very nature, enable an elegant and virtually seamless door design, often used in large-format, glazed doors. Pivot doors are therefore particularly popular in modern architecture. Concealed drive solutions are particularly popular in high-end and luxury residential construction and high-profile commercial projects, due to the high design requirements typically placed on such pivot doors.

[0006] In most solutions on the market, the automated drive of such pivot doors is achieved via an underfloor drive and, in the case of very large door elements, even via a gate drive.

[0007] DE 10 2020 113 755 B4 discloses a direct swing door actuator that can be used to directly actuate a swing door leaf. The output shaft of this direct swing door actuator, when installed, engages directly with the swing door or door leaf to drive it in rotation. This direct swing door actuator is designed as an underfloor drive located beneath the door leaf. A height adjustment unit enables the height of the output shaft to be adjusted after the direct swing door actuator has been inserted into the floor. This allows the output shaft of the actuator or drive to be securely brought into rotational engagement with the swing door when the swing door is already installed.

[0008] However, the direct swing leaf actuator known from DE 10 2020 113 755 B4 is only suitable to a limited extent for use in pivot doors. CN 1 02 889 040 A relates to a vertical swing door, in particular an electric vertical swing door with bidirectional opening. DE 10 2013 000 421 A1 relates to a drive unit for a revolving door with an electronically commutated multi-pole motor, wherein the multi-pole motor has a number of coil elements and magnetic elements and has a flat basic structure.

[0009] The installation of pivot doors presents a particular challenge. Unlike conventional revolving doors, where the hinges and fasteners are easily accessible, installing a pivot door requires the door leaf to be installed into the frame "past the drive." This is particularly difficult when the drive is a direct drive. For both aesthetic and safety reasons, the gap between the door leaf frame and the frame permanently attached to the door frame is usually very small. Furthermore, considering that pivot doors are often designed as large-format, glazed doors, this further increases the difficulty of installation. The glass surfaces bear a large part of the door's structural strength, so collision-free installation and disassembly are of paramount importance to avoid damage to both the drive and the door leaf or panel itself.

[0010] It is therefore an object of the present invention to provide a door drive that is particularly suitable as a direct drive for a pivot door and that enables simple, collision-free installation. It is also an object to provide a door assembly with such a door drive and an associated door.

[0011] According to a first aspect of the present invention, this object is achieved by a door drive according to claim 1, which comprises: - a housing; - an output shaft which is designed to be coupled to a door leaf, preferably directly, and to rotate about a rotation axis, wherein the output shaft projects from the housing beyond a first housing side in an operating position; and - an adjusting device which is designed to adjust the output shaft between the operating position and a mounting position relative to the housing along the axis of rotation, wherein the output shaft in the mounting position is completely retracted into the housing such that it no longer protrudes from the housing beyond the first housing side.

[0012] According to a second aspect of the present invention, the above object is achieved by a door assembly according to claim 12, which comprises: - a frame; - a door leaf; and - a door drive which is designed to drive the door leaf so as to rotate relative to the frame about a rotation axis, wherein the drive has an output shaft which, in an operating position, is coupled to the door leaf, preferably directly, and is designed to rotate about the rotation axis, wherein the output shaft, in the operating position, projects from the frame in the direction of the door leaf, and wherein the door drive further has an adjusting device which is designed to adjust the output shaft between the operating position and a mounting position relative to the frame along the rotation axis, wherein the output shaft, in the mounting position, is completely retracted into the frame such that it no longer projects from the frame in the direction of the door leaf.

[0013] According to the invention, the output shaft of the door drive can be adjusted between an operating position and an installation position along the rotation axis using an adjustment device, preferably translationally displaced along the rotation axis. The adjustment device enables the output shaft to be fully retracted into the housing, so that in the installation position, the output shaft no longer protrudes beyond the first housing side of the door drive housing or the frame of the door assembly.

[0014] The ability to fully retract the output shaft into the casing or frame not only simplifies assembly and disassembly in the case of pivot door designs, but also minimizes the risk of collisions during installation. This is especially important for glazed door panels that do not allow for reglazing and are sensitive to physical impact. The option of directly coupling the output shaft to the door leaf also ensures precise control of the door movement, improving the functionality and safety of the door assembly.

[0015] In this context, "fully retracted" means that the output shaft is retracted into the housing or frame at least far enough that its front end, which can be coupled to the door leaf in the operating position, no longer protrudes from the first side of the housing or frame. The front end of the output shaft can therefore, for example, be flush or aligned with the first side of the housing and / or the frame in the installed position. However, the front end of the output shaft can also be retracted further into the interior of the door drive housing and / or the frame.

[0016] The term "interior" does not necessarily refer to an enclosed space. It can also refer to a recess open to the outside in or on the door drive housing and / or in or on the door frame.

[0017] According to one embodiment, the adjustment device is accessible from outside the housing for operating purposes.

[0018] This design allows for easy access to the adjustment mechanism, simplifying maintenance and adjustment of the system without having to disassemble the entire door assembly. This increases user-friendliness and reduces maintenance costs.

[0019] According to a further embodiment, the housing has a first housing component in which a drive gear is arranged, which is operatively connected to the output shaft, wherein the output shaft protrudes through an opening from the first housing component and the adjusting device is arranged outside the first housing component.

[0020] The arrangement of the drive gear in a separate housing component (first housing component) ensures improved modularity and facilitates access to the mechanical components. This leads to simpler assembly and increased ease of maintenance. Furthermore, the spatial separation of the drive gear and adjustment device allows for more specific adaptation of both systems to their respective functions, increasing the efficiency and reliability of the drive.

[0021] According to a further embodiment, the housing has a second housing component which is directly or indirectly coupled to the first housing component, wherein the output shaft projects through the opening into the second housing component and at least a part of the adjusting device is arranged in or on the second housing component.

[0022] The integration of a second housing component, directly or indirectly connected to the first housing component, improves the structural integrity of the entire drive system. This allows for better distribution of mechanical loads, which is particularly important for heavy or large door leaves, such as those commonly used in pivot doors. The second housing component provides additional protection and stability for the adjustment mechanism.

[0023] According to a further embodiment, the output shaft in the assembly position is completely retracted into an interior space of the second housing component or into a recess formed by the second housing component.

[0024] By fully retracting the output shaft into the interior or a recess provided on the outside of the second housing component, safety during assembly and maintenance is further increased. There is less risk of workers or tools coming into contact with the output shaft during assembly, which is especially important in automated or semi-automated installation processes.

[0025] According to a further embodiment, the second housing component defines the first housing side.

[0026] In other words, the second housing component forms the first housing side, beyond which the output shaft protrudes from the housing in the operating position.

[0027] According to a further embodiment, the door drive according to the invention has a hollow gear shaft in which the output shaft is arranged and with which the output shaft is operatively connected, wherein the output shaft is adjustable relative to the hollow gear shaft along the axis of rotation.

[0028] In order to bring the output shaft into operative connection with the hollow transmission shaft, the hollow transmission shaft has, for example, an internal toothing which corresponds to an external toothing provided on the output shaft.

[0029] The output shaft and the hollow transmission shaft thus mesh and, despite their operative connection, are adjustable relative to each other along the rotational axis. This is particularly advantageous in combination with the adjustment device according to the invention, since the output shaft is then operatively connected to the hollow transmission shaft both in the operating position and in the assembly position, and the output shaft essentially plunges further into the hollow transmission shaft or protrudes further through it when adjusted to the assembly position. Overall, this allows for a very space-saving, flat design.

[0030] The resulting, comparatively low installation height of the door drive makes it possible to fully integrate it into the door assembly's frame and the space above it between the door element and the door lintel. More precisely, part of the door drive can be arranged between the on-site door lintel and the door frame, i.e. above the door frame, while a lower part of the door drive is integrated into the door frame. The lower installation height also makes it possible to use the door drive not only as an underfloor drive, but also as a ceiling drive, which is installed above the door leaf in the door lintel area in the door assembly's frame. The low installation height of the door drive also allows for the structural connection of the entire door assembly to be implemented effectively in terms of thermal insulation and structural integrity.

[0031] According to a further embodiment, the adjusting device has an adjusting plate which is adjustably mounted relative to the housing and has a second opening through which the output shaft projects.

[0032] The adjustable actuator plate increases the flexibility of the door drive system by allowing the position of the output shaft to be adjusted in a mechanically reliable manner.

[0033] According to a further embodiment, the adjusting plate is designed to support the output shaft axially along the axis of rotation.

[0034] The axial bearing of the output shaft by the adjusting plate provides additional stability and reduces mechanical wear. The adjusting plate can therefore absorb relatively large axial forces. Furthermore, the adjustment mechanism is coupled to the axial bearing of the output shaft. This improves the service life of the door drive and ensures consistent performance over long periods, which is essential in high-traffic areas such as public buildings or office complexes.

[0035] According to a further embodiment, the output shaft has a predetermined breaking point, wherein the predetermined breaking point and a free end of the output shaft are arranged on opposite sides of the setting plate with respect to the setting plate.

[0036] The inclusion of a predetermined breaking point provides an integrated safety feature that prevents damage to the door in the event of overload or jamming by breaking the output shaft at a predefined point. This can prevent failure of the entire system and the resulting high installation costs. It also protects other mechanical components of the drive system and the door leaf itself from damage, which is particularly important for valuable or difficult-to-replace door materials such as glass.

[0037] Because the predetermined breaking point and the free end of the output shaft are located on opposite sides of the adjusting plate, and the adjusting plate also serves as the axial bearing for the output shaft, the adjusting plate holds the output shaft axially even if the output shaft breaks at the predetermined breaking point. The drive is then separated from the output shaft. However, the end of the output shaft connected to the door leaf remains axially and rotationally supported, so that manual opening and closing of the door may still be possible.

[0038] According to a further embodiment, the output shaft is designed as a hollow shaft.

[0039] The hollow design of the output shaft allows for supply lines or control cables to be routed through the output shaft. This allows, for example, the power supply to be integrated into the door leaf. It also allows the weight of the door drive to be reduced somewhat, making handling and installation easier.

[0040] As already mentioned at the beginning, the present invention relates not only to the door drive itself, but also to the door assembly, which includes the door frame, the door leaf and the door drive.

[0041] According to one embodiment, the door drive is arranged above the door leaf in the direction of gravity.

[0042] Positioning the door operator above the door leaf optimizes power transmission and reduces stress on the mechanical components of the door operator, improving efficiency and extending the service life of the system. Positioning the door operator above the door leaf also solves many weather-related problems, such as water ingress or leaks in the door operator. This positioning also benefits the aesthetic integration of the door operator into the overall architectural design, as the door operator is less visible.

[0043] According to a further embodiment, the drive has a housing which is at least partially integrated into the frame and is preferably mounted in a completely concealed manner.

[0044] The compact design and installation of the door drive in the suspended ceiling area make a concealed installation possible. This allows for invisible integration of the drive system, which is particularly desirable in design-oriented applications.

[0045] It is understood that the door drive used in the door assembly according to the invention is a door drive as defined in claims 1 to 11. In this respect, the advantageous embodiments previously mentioned with respect to the door drive as well as the features defined in claims 1 to 11 also relate in an equivalent manner to the door assembly according to the invention.

[0046] It is further understood that the features mentioned above and those to be explained below can be used not only in the combination specified in each case, but also in other combinations or on their own, without departing from the scope of the present invention.

[0047] An embodiment of the invention is illustrated in the drawings and explained in more detail in the following description. They show: Fig. 1 is a schematic view illustrating the basic structure of an embodiment of the door arrangement according to the invention; Fig. 2 a sectional view of a door arrangement in Fig. 1 used embodiment of the door drive, wherein the door drive is shown in its operating position; and Fig. 3 a sectional view of the Fig. 2, with the door drive shown in its mounting position.

[0048] Fig. Figure 1 shows a schematic representation of an embodiment of the door assembly according to the invention. The door assembly is designated in its entirety by reference numeral 100.

[0049] The door assembly 100 is designed as a pivot door. It has a door leaf 12, which can also be referred to as a door panel 12. In the presently shown embodiment, the door panel or door leaf 12 comprises a glass pane 14, which is enclosed in a casement frame 16.

[0050] It is understood that the door leaf 12 does not necessarily have to be made of glass, but can also be made of other materials (e.g., metal or wood). Likewise, the door leaf 12 can also be designed frameless (i.e., without a leaf frame 16).

[0051] The door leaf 12 is pivotable about a rotation axis 20 relative to a fixed door frame 18. Unlike regular pivot doors, which are hinged on the sides, the rotation axis 20 is offset from the vertical sides of the door frame 18 inward toward the center of the door leaf 12. This offset arrangement of the rotation axis 20 represents the characteristic feature of a pivot door. The door leaf 12 thus pivots both inward and outward during an opening movement, which is often perceived as a fluid and impressive movement of the door.

[0052] The door frame 18 encloses the door leaf 12 and forms the structural basis of the door 100. The door frame 18 thus forms the fixed, immovable part of the door 100, relative to which the door leaf or the door leaf 12 (e.g. including the leaf frame and glass pane) is pivoted.

[0053] Continue from Fig. 1 shows the door drive 10, which is installed above the door leaf 12. More precisely, the door drive 10 is installed below the on-site door lintel 24 and is arranged in particular in the area between the door lintel 24 and the door frame 18. As can be seen from Fig. 2 and Fig. 3 and will be explained in detail below, a part of the door drive 10 is arranged between the on-site door lintel 24 and the door frame 18, i.e. above the door frame 18, while another (lower) part of the door drive 10 is integrated into the door frame 18.

[0054] The door drive 10 according to the invention is preferably a door drive that is mounted almost completely concealed and is barely visible to a user. During operation, only a lower part of an output shaft 26, which is preferably directly coupled to the door leaf 12, protrudes from the door frame 18. This complete integration of the door drive 10 into the door frame 18 and the area provided on site between the door frame 18 and the door lintel 24 is possible in particular due to the comparatively low overall height of the door drive 10. Preferably, the door drive 10 requires a space requirement of only 120 mm or even less in the vertical direction.

[0055] As is particularly evident from Fig. 2 and Fig. 3, the door drive 10 has a housing 28 in which the output shaft 26 is arranged at least for the most part, wherein the lower end 30 of the output shaft 26 in the Fig. 2 protrudes from the housing 28 in the operating position of the door drive 10.

[0056] In this context, "housing 28" refers to any type of structure or casing that serves to at least partially enclose, protect, or support the door drive 10 or parts thereof. The housing 28 can be completely closed, partially open, or designed as a frame construction. Parts of the housing 28 can be designed as partially open frames or consoles that allow access to and interaction with the components of the door drive 10 arranged therein. The housing 28 is preferably designed in several parts, as explained in more detail below, and has a plurality of housing components. The housing 28 is therefore preferably understood as an overall unit formed by these housing components.

[0057] The output shaft 26 is coupled to an actuator or drive motor 33 via a gear unit 32, which is referred to herein as a "drive gear." This actuator or drive motor 33 is typically an electric drive motor.

[0058] The drive gear 32 includes, among other things, a transmission output shaft 34, which is designed as a hollow shaft and is therefore also referred to below as the "transmission hollow shaft 34." The transmission hollow shaft 34 engages with the output shaft 26. The output shaft 26 extends through the transmission hollow shaft 34. For mechanical coupling, the output shaft 26 has external gearing 36, which corresponds to and engages with internal gearing 38 provided on the transmission hollow shaft 34.

[0059] The hollow transmission shaft 34 is, in turn, mounted for rotation about the rotation axis 20 via a bearing 40 in the housing 28 of the door drive 10. Accordingly, the rotational mobility or rotational mounting of the output shaft 26 about the rotation axis 20 is also ensured.

[0060] At the same time, the output shaft 26 is displaceable relative to the hollow transmission shaft 34 along the rotational axis 20, whereby this displacement or adjustment possibility of the output shaft 26 is present as long as it is engaged with the hollow transmission shaft 34. In other words, the output shaft 26 remains engaged with the hollow transmission shaft 34 even when it is displaced relative to the hollow transmission shaft 34 along the rotational axis 20. Accordingly, the external gearing 36 and the internal gearing 38 are preferably designed as straight splines.

[0061] For reasons explained below, it is preferred that the output shaft 26 be adjustable relative to the hollow transmission shaft 34 along the rotational axis 20 by more than 10 mm, particularly preferably by more than 20 mm. For example, the output shaft 26 can be adjusted relative to the hollow transmission shaft 34 by a maximum of 20 mm or a maximum of 30 mm, while the output shaft 26 remains engaged with the hollow transmission shaft 34, as mentioned above.

[0062] The adjustment possibility of the output shaft 26 is effected by an adjustment device 42. This adjustment device 42 is designed to adjust the output shaft 26 between the Fig. 2 shown operating position of the door drive 10 and the Fig. 3 shown mounting position of the door drive 10 relative to the housing 28 along the rotation axis 20.

[0063] While the lower end 30 of the output shaft 26 in the Fig. 2, the output shaft 26 projects downwards from the housing 28 beyond a first housing side 44, in the operating position shown in Fig. 3, the drive shaft 26 is completely retracted into the housing 28, so that the lower, free end 30 of the output shaft 26 no longer protrudes beyond the first housing side 44 from the housing 28, but is, for example, flush with this first housing side 44.

[0064] The “first housing side 44” is preferably the underside of the housing 28, which in the installed state is preferably flush with the Fig. 2 and Fig. 3 underside 46 of the door frame 18 indicated by dashed lines. Regardless of whether the underside or first housing side 44 is flush with the underside 46 of the door frame 18 or is even offset upwards compared to the underside 46 of the door frame 18, i.e. inwards into the door frame 18, it is preferred according to the invention that the output shaft 26 protrudes from the door frame 18 in the operating position, while in the assembly position it is completely retracted into the door frame 18, i.e. the lower end 30 of the output shaft 26 no longer protrudes beyond the door frame 18.

[0065] In the Fig. In the mounting position of the door drive 10 shown in Figure 2, the lower end 30 of the output shaft 26 is directly coupled to the door leaf or door wing 12. For this purpose, the output shaft 26 has a second external toothing 46 at its lower end 30, which engages with a corresponding second internal toothing 48, which is preferably integrated into the wing frame 16 or attached thereto.

[0066] In the Fig. 3, the output shaft 26 is retracted further upwards into the housing 28, so that the second external toothing 46 arranged on the output shaft 26 does not engage with the second internal toothing 48 arranged on the door leaf 12.

[0067] The adjustment device 42 has an adjustably mounted adjusting plate 50. The position of this adjusting plate 50 can be adjusted relative to the housing 28 using two adjusting screws 52. More precisely, the adjusting plate 50 can be moved translationally relative to the housing 28 along the rotation axis 20 using the adjusting screw 52. Two threaded pins 54 are also provided to fix the adjusting plate 50 in a desired position (e.g., in the operating position). These threaded pins enable the adjusting plate 50 to be fixed relative to the housing 28.

[0068] The adjusting plate 50 provides axial support for the output shaft 26, so that the output shaft 26 moves along the rotational axis 20 with the adjusting plate 50 when the adjusting plate 50 is adjusted by means of the adjusting device 42. At the same time, the output shaft 26 is mounted so as to be rotatable about the rotational axis 20 relative to the housing 28 as well as relative to the adjusting plate 50. This is made possible by corresponding plain bearings, which are Fig. 2 and Fig. 3 are indicated by the reference number 56.

[0069] Above the bearing of the output shaft 26 on the adjusting plate 50, the output shaft 26 has a predetermined breaking point 58. In the presently shown embodiment, the predetermined breaking point 58 is designed as a constriction or milled recess. In the event of an overload of the door drive 10, for example due to a jam or a strong impact on the door leaf 12, the predetermined breaking point 58 ensures that the output shaft 26 breaks at a defined location. A break in the output shaft 26 therefore does not lead to a complete failure of the door assembly 100. In particular, the door leaf 12 is not decoupled from its bearing 56 provided in the door frame 18.

[0070] In the illustrated embodiment, the housing 28 of the door drive 10 is constructed in several parts. It has a first housing component 60 and a second housing component 62. The drive gear 32 is arranged in the first housing component 60. The drive gear 32 is in turn housed in a gear housing 61. In the present embodiment, the first housing component 60 is designed as a partially open (mounting) bracket in which the gear housing 61 is fastened using screws 63. The adjusting device 42 is arranged in and / or on the second housing component 62. The adjusting device 42 is thus arranged spatially separate from the drive gear 32, which improves modularity and thus facilitates installation.

[0071] The drive shaft 26 extends through a first opening 64 provided in the first housing component 60 into the second housing component 62. The adjusting plate 50 has a second opening 66 through which the output shaft 26 also extends. While the first housing component 60 is preferably designed as a closed or at least almost closed housing component, the second housing component 62 is designed as a partially open housing component in the presently shown embodiment. The second housing component 62 defines the aforementioned first housing side 44 of the housing 28 at its lower end.

[0072] As further stated Fig. 2 and Fig. 3, the first housing component 60 is largely installed between the on-site door lintel 24 and the door frame 18, while the second housing component 62 is largely integrated into the door frame 18. In Fig. In Figure 2, the underside of the door lintel 24 is indicated by a dashed line. The top side 68 and the bottom side 46 of the door frame 18 are also shown in dashed lines for orientation of their respective positions.

[0073] Ultimately, in Fig. 2 and Fig. 3 that the output shaft 26 is preferably designed as a hollow shaft, which allows the integration of further components into the interior of the output shaft 26 or, for example, a cable feedthrough through the interior of the output shaft 26. List of reference symbols 10 Door drive 12 Door leaf or door wing 14 glass pane 16 sash frames 18 door frames 20 Rotation axis 24 Door lintel 26 Output shaft 28 housings 30 Lower end of the output shaft 32 drive gears 33 Drive motor 34 Gearbox hollow shaft 36 external gearing 38 internal gearing 42 Adjustment device 44 First housing side 46 Bottom 48 Second internal gear 50 base plate 52 adjusting screws 54 threaded pins 56 plain bearings 58 Predetermined breaking point 60 First housing component 61 Gearbox housing 62 Second housing component 63 screws 64 First opening 66 Second opening 68 Top 100 Door arrangement

Claims

[1] Door drive (10), which is designed in particular as a direct drive for a pivot door, comprising: - a housing (28); - an output shaft (26) which is designed to be coupled to a door leaf (12), preferably directly, and to rotate about a rotation axis (20), wherein the output shaft (26) projects from the housing (28) beyond a first housing side (44) in an operating position; and - an adjusting device (42) which is designed to adjust the output shaft (26) between the operating position and a mounting position relative to the housing (28) along the rotation axis (20), wherein the output shaft (26) in the mounting position is completely retracted into the housing (28) such that it no longer protrudes from the housing (28) beyond the first housing side (44). [2] Door drive (10) according to claim 1, wherein the adjusting device (42) is accessible from outside the housing (28) for operating purposes. [3] Door drive (10) according to claim 1 or 2, wherein the housing (28) has a first housing component (60) in which a drive gear (32) is arranged, which is operatively connected to the output shaft (26), wherein the output shaft (26) projects out of the first housing component (60) through an opening (64) and the adjusting device (42) is arranged outside the first housing component (60). [4] Door drive (10) according to claim 3, wherein the housing (28) has a second housing component (62) which is directly or indirectly coupled to the first housing component (60), wherein the output shaft (26) projects through the opening (64) into the second housing component (62) and at least a part of the adjusting device (42) is arranged in or on the second housing component (62). [5] Door drive according to claim 4, wherein the output shaft (26) in the mounting position is completely retracted into an interior of the second housing component (62) or into a recess formed by the second housing component (62). [6] Door operator (10) according to claim 3 or 4, wherein the second housing component (62) defines the first housing side (44). [7] Door drive (10) according to one of the preceding claims, further comprising a hollow transmission shaft (34) in which the output shaft (26) is arranged and with which the output shaft (26) is operatively connected, wherein the output shaft (26) is adjustable relative to the hollow transmission shaft (34) along the rotation axis (20). [8] Door drive (10) according to one of the preceding claims, wherein the adjusting device (42) has an adjusting plate (50) adjustably mounted relative to the housing (28) with a second opening (66) through which the output shaft (26) projects. [9] Door drive (10) according to claim 8, wherein the adjusting plate (50) is adapted to axially support the output shaft (26) along the rotation axis (20). [10] Door drive (10) according to claim 8 or 9, wherein the output shaft (26) has a predetermined breaking point (58), and wherein the predetermined breaking point (58) and a free end (30) of the output shaft (26) are arranged on opposite sides of the adjusting plate (50) with respect to the adjusting plate (50). [11] Door drive (10) according to one of the preceding claims, wherein the output shaft (26) is designed as a hollow shaft. [12] Door arrangement (100), which is designed in particular as a pivot door arrangement, comprising: - a frame (18); - a door leaf (12); and - a door drive (10) which is designed to drive the door leaf (12) relative to the frame (18) about a rotation axis (20), wherein the drive (10) has an output shaft (26) which, in an operating position, is coupled to the door leaf (12), preferably directly, and is designed to rotate about the rotation axis (20), wherein the output shaft (26) protrudes from the frame (18) in the direction of the door leaf (12) in the operating position, and wherein the door drive (10) further has an adjusting device (42) which is designed to adjust the output shaft (26) between the operating position and a mounting position relative to the frame (18) along the rotation axis (20), wherein the output shaft (26) in the mounting position is completely retracted into the frame (18) in such a way that it no longer protrudes from the frame (18) in the direction of the door leaf (12). [13] Door arrangement (100) according to claim 12, wherein the door drive (10) is arranged above the door leaf (12) in the direction of gravity. [14] Door arrangement (100) according to claim 13, wherein the drive (10) has a housing (28) which is integrated into the frame (18), preferably mounted completely concealed. [15] Door arrangement (100) according to one of claims 12 to 14, wherein the door drive (10) is a door drive (10) according to one of claims 1 to 11.

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