Multi-part drive shaft for a drive means of an elevator system

Abstract

The invention relates to a drive shaft (1.1, 1.2) for at least one support means (7.1, 7.2) of an elevator system (10), having at least one support means sleeve (2) with at least one circumferential contact surface (2.1, 2.2) for receiving at least one support means (7.1, 7.2) of the elevator system (10), a first shaft stub (3) having a first coupling portion (3.1) for coupling a drive device (5) for conjoint rotation and having a first connecting portion (3.2) for engaging in the at least one support means sleeve (2), and a second shaft stub (4) having a second coupling portion (4.1) for coupling a brake (6) for conjoint rotation and having a second connecting portion (4.2) for engaging in the at least one support means sleeve (2), wherein the first connecting portion (3.2) and the second connecting portion (4.2) engage on both sides in the at least one support means sleeve (2) and are joined to the at least one support means sleeve (2) to form the drive shaft (1.1, 1.2). The invention further relates to an elevator system (10) having such a drive shaft (1.1, 1.2).

Description

[0001] Multi-part drive shaft for the propellant of an elevator system

[0002] Technical area

[0003] The following statements concern a drive shaft for the support means of an elevator system.

[0004] Furthermore, the following embodiments relate to an elevator system with at least one vertically extending elevator shaft, at least one elevator car movable along the elevator shaft, at least one drive shaft, at least one drive device coupled to the drive shaft, at least one brake coupled to the drive shaft and at least one support means assigned to a car.

[0005] Technical background

[0006] Elevator systems for the vertical transport of 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 which one or more elevator cars are moved between landing positions by means of drives such as suspension drives or linear drives.

[0007] In conventional suspension drives, ropes are often used as the suspension element, which are held and driven by traction sheaves, with the traction sheaves being attached to drive shafts. Due to the comparatively low tolerance of ropes to alternating bending, such traction sheaves are usually designed with a relatively large diameter. Alternatively, chains are also used as the suspension element, which rely on relatively complex gears attached to the drive shaft for holding and driving.

[0008] To avoid the disadvantages of the aforementioned suspension elements, it is already known to use belts as suspension elements. These belts can be held and driven on a contact surface of a much smaller diameter due to the significantly greater tolerance to alternating bending. In particular, thanks to the relatively small diameter, such a contact surface can technically expediently be formed directly on the drive shaft. However, drive shafts with contact surfaces provided directly on them are disadvantageous and therefore complex to manufacture. In particular, such drive shafts have relatively strong diameter differences in different axial shaft sections, meaning that the smaller of these diameters have to be manufactured from a relatively large semi-finished product, resulting in high material loss and a high expenditure of effort, particularly time, required.Furthermore, it is usually necessary to adapt the drive shaft to the specific design and installation situation of an elevator system, including with regard to the axial extension and the axial distances between individual shaft sections, so that the drive shaft is particularly expensive as a custom-made product for a specific elevator system.

[0009] From DE 10 2019 120 992 Al, for example, ammunition lifts or provisions lifts for ships are known, with which goods such as ammunition or provisions can be moved within a ship and which have a belt-like pulling device.

[0010] Description - Technical solution

[0011] Based on this situation, one of the tasks at hand is to simplify the drive shaft, in particular to simplify the manufacture of a drive shaft, in elevator systems with support means directly attached to the drive shaft.

[0012] The present problem is solved by the features of the independent main claims. Advantageous embodiments are specified in the subclaims. To the extent technically feasible, the teachings of the subclaims can be combined arbitrarily with the teachings of the main and subclaims.

[0013] In particular, the object is accordingly achieved by a drive shaft for at least one support means of an elevator installation, comprising at least one support means sleeve with at least one circumferential contact surface for receiving at least one support means of the elevator installation, a first stub shaft with a first coupling section for the rotationally fixed coupling of a drive device and with a first connecting section for engaging in the at least one support means sleeve and a second stub shaft with a second coupling section for the rotationally fixed coupling of a brake and with a second connecting section for engaging in the at least one support means sleeve, wherein the first connecting section and the second connecting section engage on both sides in the at least one support means sleeve and are joined to the at least one support means sleeve to form the drive shaft.

[0014] Advantageous aspects are explained below, and preferred modified embodiments are described further below. 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 expressly stated.

[0015] Where ordinal numbers ("first", "second", etc.) are used, for example to designate a component, an element, a process step, or a process action, these ordinal numbers are intended purely for differentiation in the designation and do not indicate any dependencies or sequences. This means, in particular, that, for example, a device does not have to have a "first component" in order 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 can also be provided, for example, multiple "first components."

[0016] A drive shaft is a rotating, elongated machine element, particularly with circular cross-sections, used to transmit rotary motion and torque. In particular, a drive shaft has a greater axial extension than radial extension and is therefore essentially cylindrical in shape. In an elevator system, the rotary motion or torque is transmitted between a drive device or a brake of the elevator system and the support means attached to a car. A drive shaft is typically supported by at least two pivot bearings. When transmitting torque, the drive shaft is subjected to torsional stress.

[0017] A support element is generally designed as a belt, strap, rope, chain, or the like and carries tensile loads in the direction of its longitudinal extension. Insofar as the present disclosure primarily relates to support elements that bear directly against the drive shaft, i.e., for which a force- or torque-transmitting surface is formed on a surface of the shaft, these are designed in particular as belts, for example as flat belts, V-belts, or toothed belts, or as straps. A belt is characterized in particular by having a flat cross-section.

[0018] According to the present understanding, an elevator installation is designed, for example, with at least one vertical elevator shaft and at least one car, but can also have a plurality of elevator shafts, in particular a plurality of parallel vertical elevator shafts, and / or a plurality of cars, in particular a plurality of cars in one elevator shaft. A car is held on a first side by the drive shaft by means of the support means and is driven via the support means, wherein a drive device transmits the drive torque via the drive shaft and / or a brake transmits a braking torque to the support means via the drive shaft. The support means is further preferably connected on a second side by the drive shaft by means of the support means to a counterweight assigned to the car. A drive device is in particular arranged in a machine room above the elevator shaft orthe elevator shafts or in an upper section of an elevator shaft, the so-called shaft head.

[0019] A shaft stub is a shaft element that is primarily designed to form connecting sections, wherein the connecting sections engage, for example, in components of the elevator system or other elements of the drive shaft. A coupling section is designed in particular for engagement with a drive device or a brake and has a corresponding geometry, for example with teeth, a recess for a feather key, a wedge or with a non-circular geometry such as a polygonal geometry, and can be inserted, for example, into a corresponding receptacle in the drive device or brake. A rotationally fixed connection is understood to mean that a rotational movement or torque can be transmitted between the respective shaft stub and the drive device or brake via the connection in a substantially wear-free and backlash-free manner. The respective coupling section can be connected to the drive device orBrake can also be connected indirectly via a gear unit. A drive device can be, for example, an electric machine, a pneumatic machine or a hydraulic machine. A suspension element sleeve has, in particular over an axial extent that corresponds to a width of a suspension element, a contact surface on which the suspension element can be held in a rotationally fixed manner for the expected drive loads and can be driven or braked. Depending on the suspension element, the rotational stability can be achieved, for example, by positive locking or frictional locking. The contact surface is, for example, machined and / or shaped accordingly, i.e., has, for example, corresponding surface qualities or geometries. For a flat belt, the contact surface can, in particular, be cylindrical or convex. The suspension element wraps around the suspension element section and lies against the contact surface along a wrap angle.If the suspension element sleeve is a sleeve, it has a central, axially extending recess, which particularly preferably has a purely cylindrical geometry. The suspension element sleeve is therefore annular in cross-section and thus designed as a hollow cylinder.

[0020] Joining is the permanent connection of two or more solid bodies with a geometrically defined shape, the so-called joining parts. In some joining processes, an "amorphous material" is also used, i.e. a material whose shape is not more precisely defined, such as an adhesive, a solder or a welding filler. Through joining, the cohesion between the joining parts is created or increased locally, i.e. at the joining points. The connection can be fixed or movable and can be separated non-destructively or inseparable, i.e. can only be separated with destruction. Forces and / or moments as well as movements, in particular rotational movements, are transmitted via the active surfaces of the connection.

[0021] The solution to the problem with a drive shaft described above now includes the teaching that the drive shaft is designed modularly from several elements. The elements, namely the support sleeve and the shaft stubs, are divided in such a way that the diameters provided for each element differ relatively small from one another. The respective elements can then be easily manufactured from an appropriately dimensioned semi-finished product with significantly reduced effort. The differences in the diameters are further advantageously taken into account with the drive shaft in that the support sleeve is designed as a sleeve, i.e. as a hollow shaft, and the shaft stubs, which have a relatively small diameter, engage in the shaft sleeve. The engagement using various joining methods enables the elements to be easily joined to one another.Ultimately, by dividing the drive shaft into several elements joined together, adaptations to the drive shaft with regard to the respective design and installation situation in an elevator system, in particular with regard to the axial extent, can be made to just one element, so that the other elements remain unchanged. The other elements can then be produced cost-effectively in larger quantities as standard parts, while individualization of the drive shaft is still possible by adapting one of the elements. Adaptation can also be carried out in such a way that all essential elements are designed as standard parts and are variably spaced from one another using appropriate adapter pieces. The drive shaft created in this way is therefore easy to manufacture; in particular, the individual elements can be manufactured and joined with little effort, and their design can be varied easily.

[0022] As an alternative to the features described above, or in a preferred embodiment of the above, the at least one support element sleeve has at least two circumferential contact surfaces, each for receiving and driving support elements of the elevator system. The drive shaft is then configured to accommodate two synchronously operated support elements. In particular, the two contact surfaces are provided for support elements connected redundantly to the same elevator car.

[0023] As an alternative to the features described above, or in a preferred embodiment of the above, it is provided that the respective coupling section of the first shaft stub and / or the second shaft stub has a smaller diameter than the respective connecting section. This allows the selection of a semi-finished product that corresponds to or almost corresponds to the diameter of the connecting section, so that only minimal machining effort is required to produce the connecting section, while the machining effort required to produce a geometry of the coupling section is largely the same.In addition, the diameter at which the connecting section is joined to the support element sleeve can be selected to be relatively large in this way in order to achieve a particularly light support element sleeve and, thanks to the relatively large joining surface, a particularly large torque that can be transmitted between the shaft stub and the support element sleeve. As an alternative to the features described above, or in a preferred embodiment of the above, it is provided that the first shaft stub and / or the second shaft stub have a collar on the respective connecting section for axially abutting against the at least one support element sleeve and thus for determining the engagement depth of the connecting section in the at least one support element sleeve. This achieves positioning of the elements relative to one another and ensures that the connecting sections do not interfere with one another when engaging in the support element sleeve.In addition, by forming the collar on the shaft stubs, a central recess of the support sleeve can be formed as a simple cylindrical geometry without one or more stops having to be provided within this recess.

[0024] As an alternative to the features described above, or in a preferred embodiment of the above, it is provided that the first connecting section and / or the second connecting section are each joined to the at least one support element sleeve by means of an interference fit. Such an interference fit allows for the transmission of high torque, while all parts are also rotationally symmetrical and thus exhibit favorable concentricity. The interference fit can be achieved, for example, by heating or cooling one of the elements prior to assembly.

[0025] As an alternative to the features described above, or in a preferred embodiment of the above, it is provided that the first connecting section and / or the second connecting section are each joined to the at least one support element sleeve by means of a positive fit, in particular by means of mutually corresponding non-circular geometries such as polygons. Such a positive fit allows a high torque to be transmitted, and in addition, all parts can be designed with a centered center of gravity and thus exhibit favorable concentricity. Furthermore, mutually corresponding non-circular geometries are particularly easy to join. A positive fit can also be achieved, for example, by means of a keyed connection.

[0026] As an alternative to the features described above, or in a preferred embodiment of the above, it is provided that the first connecting section and / or the second connecting section are each thermally joined to the at least one support element sleeve. Through thermal joining, for example by welding, the connecting section and the support element sleeve can be formed particularly simply, for example as simple cylindrical geometries, whereby the joining can also be carried out in a simple and cost-effective manner.

[0027] As an alternative to the features described above, or in a preferred embodiment of the above, at least one coupling section has a multi-tooth contour for the rotationally fixed coupling of the drive device or brake. Such a multi-tooth contour enables a secure transmission of torque from the drive device or brake to the drive shaft, while the positive connection during installation of the elevator system can be achieved particularly easily, namely by inserting the multi-tooth geometry into the drive device or brake.

[0028] As an alternative to the features described above, or in a preferred embodiment of the above, the first stub shaft and the second stub shaft are designed as identical parts. The number of different parts, each of which would require individual production, is thus reduced, and a unit-count effect is advantageously achieved, making the first and second stub shafts significantly more cost-effective to manufacture. Adaptation of the drive shaft, for example, in its axial extent, is then achieved via the at least one support element sleeve or other elements, and in any case not via the first and second stub shafts, which are designed as identical parts.

[0029] As an alternative to features described above or in a preferred embodiment of the above, the drive shaft has at least two support element sleeves and a third shaft stub with a third connecting section and a fourth connecting section, each for engaging in one of the at least two support element sleeves, wherein the first connecting section engages in one of the at least two support element sleeves and the second connecting section engages in another of the at least two support element sleeves and is joined to the respective support element sleeve to form the drive shaft, and wherein the third connecting section engages in one of the at least two support element sleeves and the fourth connecting section engages in another of the at least two support element sleeves and is joined to the respective support element sleeve to form the drive shaft. The third shaft stubs are therefore interposed between two support element sleeves.On the drive shaft, several support elements can then be accommodated on the at least two support element sleeves, for example, redundant support elements for an elevator car. Furthermore, the support element sleeves can then be designed as identical parts, with the axial extension of the drive shaft being adapted to the specific conditions of an elevator system via the third shaft stubs. The third shaft stubs can have a particularly simple geometry and are therefore particularly easy and cost-effective to manufacture. For example, the third shaft stubs are designed as simple cylinders.

[0030] The object is further achieved by an elevator system comprising at least one vertically extending elevator shaft, at least one elevator car movable along the elevator shaft, at least one drive shaft as described above, at least one drive device coupled to the first coupling section of the drive shaft, at least one brake coupled to the second coupling section of the drive shaft and at least one support means assigned to a car and received on the drive shaft.

[0031] The above solution to the problem with an elevator system includes the teaching that the drive shaft is designed as a drive shaft as described above, and the advantages described in this regard are accordingly transferred to the elevator system. The elevator system is therefore particularly simple in design and easy and cost-effective to manufacture. Depending on the design of the elevator system, the drive shaft can be variably adapted in its design, particularly in its axial extension, so that variably designed elevator systems can be implemented while maintaining the same advantages provided by the drive shaft.

[0032] In a preferred embodiment of the immediately above-described embodiment, the at least one suspension element is designed as a flat belt and frictionally wraps around the drive shaft at the contact surface. In this way, the drive shaft or the suspension element sleeve can be designed with a particularly small diameter, and the elevator system can thus be particularly compact. In particular, the compact design allows the drive shaft and / or the drive device to be installed in a confined shaft head. Brief Description of the Drawings

[0033] A preferred technical solution is explained in more detail below with reference to the accompanying drawings using preferred embodiments. The term "figure" is abbreviated to "Fig." in the drawings.

[0034] The drawings show

[0035] Fig. 1a is a perspective exploded view of a drive shaft for an elevator installation in a first embodiment;

[0036] Fig. 1b is a perspective view of the drive shaft in the first embodiment according to Fig. 1a;

[0037] Fig. 2a is a perspective exploded view of a drive shaft for an elevator system in a second embodiment;

[0038] Fig. 2b is a perspective view of the drive shaft in the second embodiment according to Fig. 2a; and

[0039] Fig. 3 is a highly schematic representation of an elevator system.

[0040] Detailed description of the drawings

[0041] The described embodiments are merely examples that can be modified and / or supplemented in a variety of ways within the scope of the claims. Each feature described for a specific embodiment can be used independently or in combination with other features in any other embodiment. Each feature described for an embodiment of a specific claim category can also be used correspondingly in an embodiment of a different claim category.

[0042] Figures 1a and 1b show a drive shaft 1.1 in a first embodiment, once in an exploded view and once in an assembled state. The drive shaft 1.1 has a support means sleeve 2 with two contact surfaces 2.1, 2.2 formed thereon for receiving belt support means not shown in detail in Figures 1a and 1b. The belts partially wrap around the contact surfaces 2.1, 2.2, in particular approximately halfway around them, and are thus held there by frictional engagement and can be subjected to torque via the drive shaft 1.1. The support means sleeve 2 further has outer collars 2.3 and a central collar 2.4, by which the contact surfaces 2.1, 2.2 are separated from one another, as well as a cylindrical central recess 2.5, which is designed to engage the shaft stubs 3, 4 described below.

[0043] The drive shaft 1.1 is further formed by a first stub shaft 3 and a second stub shaft 4. The stub shafts 3, 4 each have a coupling section 3.1, 4.1, wherein the first stub shaft 3 is coupled or can be coupled by means of the first coupling section 3.1 to a drive device 5 (not shown in detail in Figures 1a, 1b), and the second stub shaft 4 is coupled or can be coupled by means of the second coupling section 4.1 to a brake 6 (not shown in detail in Figures 1a, 1b). The stub shafts 3, 4 also each have connecting sections 3.2, 4.2, which are provided on opposite sides for engaging in the central recess 2.5 of the suspension element sleeve 2. The connecting sections 3.2, 4.2 are then joined to form the drive shaft 1.1 shown assembled in Figure 1b with the support means sleeve 2, for example by force fit (e.g. by forming a press fit), form fit (e.g.due to a non-circular geometry or a keyway connection) or material connection (e.g. by thermal joining). The shaft stubs 3, 4 also have spacer sections 3.3, 4.3, by means of which the coupling sections 3.1, 4.1 are spaced from the connecting sections 3.2, 4.2. The spacer sections 3.3, 4.3 are offset from the connecting sections 3.2, 4.2 by collars 3.4, 4.4, whereby the collars 3.4, 4.4 also serve as stops on end faces 2.6 of the support member sleeve 2 and thus for determining the engagement depth of the connecting sections 3.2, 4.2 in the central recess 2.5. The spacer sections 3.3, 4.3 can also serve to accommodate bearings of a shaft bearing arrangement and have surface geometries corresponding to the respective bearing.

[0044] In the drive shaft 1.1, the first coupling section 3.1 of the first shaft stub 3 is designed as a cylinder with a smooth surface and is intended to be connected to the drive device 5 by means of an interference fit or by means of a key connection (not shown in detail). The second coupling section 4.1 of the second shaft stub 4, on the other hand, is designed as a multi-tooth tooth and is intended to engage in a corresponding counter-geometry of the brake 6 to form a positive connection. The drive shaft 1.2, shown in Figures 2a, 2b in a second embodiment, once in an exploded view and once in an assembled state, largely corresponds to the drive shaft 1.1 in the first embodiment and will therefore not be described repeatedly in terms of the corresponding features. In the drive shaft 1.2, in contrast to the drive shaft 1.1, the two

[0045] Coupling sections 3.1, 4.1 are each designed as a multi-tooth, whereby the coupling sections 3.1,

[0046] 4.1, with the respective multi-tooth, engages a corresponding countergeometry 5.1, 6.1 of the drive device 5 or brake 6, respectively, shown only partially in Figures 2a and 2b. The shaft ends 3, 4 are thus designed as identical parts. The multi-tooth connection with the drive device 5 also eliminates the imbalance that would arise with a keyed connection between the first coupling section 3.1 and the drive device 5. Balancing of the drive device, which would then be necessary, is therefore dispensed with.

[0047] Figure 3 shows a highly schematic representation of an elevator system 10 with an elevator shaft 11 extending in the vertical direction V, in which a car 12 can be moved between landing positions not shown in detail. In a shaft head

[0048] 11.1 houses a drive device 5, which is designed, for example, as an electric machine, pneumatic machine, or hydraulic machine. Furthermore, a brake 6 is arranged in the shaft head 11.1, which is designed, for example, as an electric machine, mechanical brake, or eddy current brake. A drive shaft 1.1, 1.2 is arranged in the shaft head 11.1, which is connected in a rotationally fixed manner to the drive device 5 and the brake 6 on a bearing (not shown in detail). The drive shaft 1.1, 1.2 receives two suspension elements 7.1, 7.2 on a suspension element sleeve 2 for driving and braking them, respectively. The suspension elements 7.1, 7.2 are designed as flat belts and are redundantly connected on a first side of the drive shaft 1.1, 1.2 to the elevator car 12 for driving the latter. The connection and guidance of the suspension elements 7.1, 7.2 is shown in a highly simplified manner and can, for example, be designed in a known manner corresponding to a 1:1 suspension or a 2:1 suspension. Furthermore, the support means 7.1, 7.2 are connected to a counterweight on a second side of the drive shaft 1.1, 1.2 in a manner not shown. The drive shaft 1.1, 1.2 is designed according to Figures 1a, 1b or according to Figures 2a, 2b. List of reference symbols.

[0049] 1.1 Drive shaft

[0050] 1.2 Drive shaft

[0051] 2 suspension sleeve

[0052] 2.1 Contact surface of the suspension sleeve

[0053] 2.2 Contact surface of the suspension sleeve

[0054] 2.3 outer collar of the support sleeve

[0055] 2.4 middle collar of the suspension sleeve

[0056] 2.5 central recess of the suspension sleeve

[0057] 2.6 Front face of the suspension sleeve

[0058] 3 first shaft stub

[0059] 3.1 first coupling section of the first shaft stub

[0060] 3.2 first connecting section of the first shaft stub

[0061] 3.3 From the stand section of the first shaft stub

[0062] 3.4 Collar of the first shaft stub

[0063] 4 second shaft stub

[0064] 4.1 second coupling section of the second shaft stub

[0065] 4.2 second connecting section of the second shaft stub

[0066] 4.3 From the stand section of the second shaft stub

[0067] 4.4 Collar of the second shaft stub

[0068] 5 Drive device

[0069] 5.1 Counter geometry of the drive device

[0070] 6 Brake

[0071] 6.1 Counter geometry of the brake

[0072] 7.1 first load-bearing element

[0073] 7.2 second load-bearing element

[0074] 10 elevator system

[0075] 11 Elevator shaft

[0076] 11.1 Shaft head of the elevator shaft

[0077] 12 car

[0078] V vertical direction

Claims

Claims 1. Drive shaft (1.1, 1.2) for at least one support means (7.1, 7.2) of an elevator installation (10), comprising at least one support means sleeve (2) with at least one circumferential contact surface (2.1, 2.2) for receiving at least one support means (7.1, 7.2) of the elevator installation (10); a first shaft stub (3) with a first coupling section (3.1) for the rotationally fixed coupling of a drive device (5) and with a first connecting section (3.2) for engaging in the at least one support means sleeve (2); and a second shaft stub (4) with a second coupling section (4.1) for the rotationally fixed coupling of a brake (6) and with a second connecting section (4.2) for engaging in the at least one support means sleeve (2); wherein the first connecting section (3.2) and the second connecting section (4.2) engage on both sides into the at least one support means sleeve (2) and are joined to the at least one support means sleeve (2) to form the drive shaft (1.1, 1.2).

2. Drive shaft (1.1, 1.2) according to claim 1, wherein the at least one support means sleeve (2) has at least two circumferential contact surfaces (2.1, 2.2) each for receiving and driving support means (7.1, 7.2) of the elevator installation (10).

3. Drive shaft (1.1, 1.2) according to claim 1 or 2, wherein in the first shaft stub (3) and / or in the second shaft stub (4) the respective coupling section (3.1, 4.1) has a smaller diameter than the respective connecting section (3.2, 4.2).

4. Drive shaft (1.1, 1.2) according to one of the preceding claims, wherein the first shaft stub (3) and / or the second shaft stub (4) have a collar (3.4, 4.4) on the respective connecting section (3.2, 4.2) for axially abutting the at least one support means sleeve (2) and thus for determining the depth of engagement of the connecting section (3.2, 4.2) in the at least one support means sleeve (2).

5. Drive shaft (1.1, 1.2) according to one of the preceding claims, wherein the first connecting section (3.2) and / or the second connecting section (4.2) are each joined to the at least one support means sleeve (2) by means of an interference fit.

6. Drive shaft (1.1, 1.2) according to one of the preceding claims, wherein the first connecting section (3.2) and / or the second connecting section (4.2) are each joined to the at least one support means sleeve (2) by form-fitting, in particular by mutually corresponding non-circular geometries.

7. Drive shaft (1.1, 1.2) according to one of the preceding claims, wherein the first connecting section (3.2) and / or the second connecting section (4.2) are each thermally joined to the at least one support means sleeve (2).

8. Drive shaft (1.1, 1.2) according to one of the preceding claims, wherein at least one coupling section (3.1, 4.1) has a multi-tooth contour for the rotationally fixed coupling of the drive device (5) or brake (6).

9. Drive shaft (1.1, 1.2) according to one of the preceding claims, wherein the first shaft stub (3) and the second shaft stub (4) are designed as identical parts.

10. Drive shaft (1.1, 1.2) according to one of the preceding claims, comprising at least two support sleeves (2); and a third shaft stub with a third connecting section and a fourth connecting section, each for engaging one of the at least two support sleeves (2); wherein the first connecting section (3.2) engages one of the at least two support sleeves (2) and the second connecting section (4.2) engages another of the at least two support sleeves (2) and is joined to the respective support sleeve (2) to form the drive shaft (1.1, 1.2); and wherein the third connecting section engages one of the at least two support sleeves (2) and the fourth connecting section engages another of the at least two support sleeves (2) and is joined to the respective support sleeve (2) to form the drive shaft (1.1, 1.2).

11. Elevator installation (10), comprising at least one vertically extending elevator shaft (11); at least one elevator car (12) movable along the elevator shaft (11); at least one drive shaft (1.1, 1.2) according to one of the preceding claims; at least one drive device (5) coupled to the first coupling section (3.1) of the drive shaft (1.1, 1.2); at least one brake (6) coupled to the second coupling section (4.1) of the drive shaft (1.1, 1.2); and at least one support means (7.1, 7.2) assigned to a car (12) and received on the drive shaft (1.1, 1.2).

12. Elevator installation (10) according to claim 11, wherein the at least one support means (7.1, 7.2) is designed as a flat belt and frictionally wraps around the drive shaft (1.1, 1.2) on the contact surface (2.1, 2.2).

Images