Shaft having shaft sections of different sizes which are connected in a rotationally fixed manner

Abstract

The following embodiments relate to a shaft (1.1,..., 1.4), in particular a drive shaft for support means (25.1, 25.2) of an elevator system (20), having a first shaft section (2.1) with a first diameter; a second shaft section (2.2) which axially adjoins the first shaft section (2.1), is formed separately from the first shaft section (2.1) and has a second diameter, wherein the second diameter is greater than the first diameter; at least one connecting piece (7) for producing a rotationally fixed connection between the first shaft section (2.1) and the second shaft section (2.2); and at least one retaining ring (8) which surrounds the first shaft section (2.1) and is fixed on an end face of the second shaft section (2.2), for fixing the connecting piece (7) with respect to the second shaft section (2.2), wherein the first shaft section (2.1) has at least one first groove (6.1) running orthogonally to its axial extent, and wherein the connecting piece (7) engages in a form-fitting manner in the first groove (6.1) in order to produce the rotationally fixed connection.

Description

[0001] Shaft with non-rotatably connected shaft sections of different sizes

[0002] Technical area

[0003] The following statements relate to a shaft, in particular a drive shaft for support means of an elevator installation, comprising a first shaft section with a first diameter, a second shaft section which is axially adjacent to the first shaft section and is formed separately from the first shaft section and has a second diameter, wherein the second diameter is formed larger than the first diameter, and at least one connecting piece for establishing a rotationally fixed connection between the first shaft section and the second shaft section.

[0004] Furthermore, the following embodiments relate to an elevator system comprising at least one vertically extending elevator shaft, at least one elevator car movable along the elevator shaft, and at least one aforementioned shaft designed as a drive shaft.

[0005] Technical background

[0006] Shafts are known for a wide variety of applications in the art, for example, as drive shafts for elevator systems. Elevator systems for the vertical transport of people and / or goods are an integral component 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 known suspension drives, ropes are often used as the suspension means, which are held and driven by traction sheaves, with the traction sheaves being held by drive shafts. Due to the comparatively low tolerance of ropes to alternating bending, such traction sheaves are usually designed with a relatively large diameter. To avoid the disadvantages of the aforementioned suspension means, it is already known to use belts as the suspension means, which, due to the significantly greater tolerance to alternating bending, can be held and driven on a contact surface of a much smaller diameter. In particular, thanks to the relatively small diameter, such a contact surface can also be formed directly on the drive shaft for technical reasons. The disadvantage, however, is that drive shafts with contact surfaces provided directly on them are complex and correspondingly expensive to manufacture.In particular, such drive shafts have diameters that differ relatively greatly from one another in different axial shaft sections, so that the smaller of these diameters have to be manufactured from a relatively large semi-finished product, resulting in high material loss and high expenditure, in particular time.

[0008] 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.

[0009] Description - Technical solution

[0010] Based on this situation, the task at hand is to propose a shaft that is easy to manufacture and has steps of different diameters.

[0011] 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.

[0012] In particular, the object is accordingly achieved by a shaft, in particular a drive shaft for support means of an elevator installation, comprising a first shaft section with a first diameter, a second shaft section which is axially adjacent to the first shaft section and is formed separately from the first shaft section and has a second diameter, wherein the second diameter is larger than the first diameter, at least one connecting piece for establishing a rotationally fixed connection between the first shaft section and the second shaft section and at least one retaining ring which surrounds the first shaft section and is fixed to the end face of the second shaft section for fixing the connecting piece relative to the second shaft section,wherein the first shaft section has at least one first groove extending orthogonally to its axial extent and wherein the connecting piece engages positively in the first groove to establish the rotationally fixed connection.

[0013] 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.

[0014] 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."

[0015] A shaft or drive shaft is a rotating, elongated machine element, particularly with a circular cross-section, that serves to transmit rotary motion and torque. In particular, a shaft has a greater axial extension than radial extension and is therefore essentially cylindrical. In the case of a drive shaft of an elevator system, the rotary motion or torque is transmitted between a drive device and / or a brake of the elevator system and the support means attached to a car via the drive shaft. A drive shaft is usually supported by at least two pivot bearings. When transmitting torque, the drive shaft is subjected to torsional stress.

[0016] Insofar as shaft sections are formed separately from one another, they are each manufactured as individual parts and joined together in a rotationally fixed manner to form the shaft. In general, joining can be achieved, for example, by means of positive locking, frictional locking and / or material locking. Insofar as the shaft sections have different shaft diameters, these differ in particular to such an extent that the smaller first shaft section cannot be produced economically from a semi-finished product which is large enough to produce the second shaft section, i.e. only with a relatively large expenditure of time and loss of material. Furthermore, in particular they differ in the diameters of the shaft sections in such a way that a central recess in the second shaft section for the axial accommodation of the first shaft section still leads to a sufficient thickness of the resulting ring geometry so that it does not fail under normal loads.A rotationally fixed connection is understood to be a connection via which a torque or a rotational movement about the axis of rotation of the coaxial shaft sections can be transmitted between the shaft sections, in particular to an extent at which the shaft does not fail under the expected loads.

[0017] Insofar as reference is made here to a cylindrical coordinate system with an axial direction, a radial direction, and a circumferential direction, this is always the coordinate system defined by the shaft, in which the axial direction is coaxial with the shaft's axis of rotation, a radial direction is perpendicular to it, and a circumferential direction extends around the axial direction. The coordinate system is determined in the same way with respect to the entire shaft as well as with respect to the individual shaft sections.

[0018] 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 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.

[0019] 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 elevator shafts, in particular several parallel vertical elevator shafts, and / or several cars, in particular several cars in one elevator shaft. A car is held on a first side by the drive shaft by means of the support means and driven via the support means, wherein a drive device via the drive shaft generates the drive torque and / or a brake via the

[0020] The drive shaft transmits a braking torque to the support means. The support means is further preferably connected to a counterweight assigned to the car on a second side of the drive shaft by means of the support means. A drive device is arranged in particular in a machine room above the elevator shaft(s) or in an upper section of an elevator shaft, the so-called shaft head.

[0021] To the extent that the retaining ring surrounds the first shaft section, the retaining ring rests against the outer surface of the first shaft section along a line extending at least partially around the circumference of the first shaft section, thus encompassing the first shaft section. To the extent that the retaining ring is secured to the end face of the second shaft section, it rests directly against the end face and is held to the second shaft section in the axial direction and / or in the circumferential direction by a positive, force, and / or material fit.

[0022] The connecting piece is in particular in positive engagement with the first groove of the first shaft section such that torque is transmitted between the first shaft section and the connecting piece in a positive-locking manner. A supplementary transmission of torque between the first shaft section and the connecting piece can be effected by force-locking and / or by material-locking. A further transmission of torque between the connecting piece and the second shaft section can also be effected by form-locking, but alternatively or additionally also by force-locking or material-locking.

[0023] The above-described solution to the problem using a shaft now includes the teaching that firstly a two-part shaft is provided in which the individual shaft sections can each be manufactured simply and thus cost-effectively from a semi-finished product matched to the respective diameter. Furthermore, the present teaching creates a particularly simple and reliable way of transmitting torque between the shaft sections for the necessary connection of the shaft sections to one another. To form the rotationally fixed connection, in the simplest case only the first groove needs to be formed and a fixing of the retaining ring to the second shaft section needs to be provided, for example by means of corresponding recesses for connecting means. The other components, in particular the connecting piece and the retaining ring, can be manufactured simply and inexpensively in large quantities and thus at relatively low costs per unit.The shaft is therefore simple and inexpensive to manufacture. The assembly of the manufactured components is also simple and therefore inexpensive.

[0024] As an alternative to the features described above, or in a preferred embodiment of the above, the second shaft section has a central first recess on its end face, and the first shaft section projects into the central first recess. The engagement of the first shaft section in the second shaft section thus achieves centering, i.e., coaxial alignment, of the first shaft section on the second shaft section. Furthermore, a radial positive fit is created between the shaft sections, and the engagement allows further components, in particular the connecting piece, to be positioned or held in a positive fit in at least one direction. Furthermore, the depth of engagement of the first shaft section can be defined by the depth of the central recess, which determines the axial positioning of the first shaft section on the second shaft section.

[0025] As an alternative to the features described above, or in a preferred embodiment of the above, the retaining ring is fixed to the second shaft section in the axial direction and / or in the circumferential direction. When fixed axially, the retaining ring can then secure the connecting piece, for example, axially to the second shaft section or hold it in a form-fitting manner. When fixed in the circumferential direction, the retaining ring can also particularly advantageously contribute to the transmission of torques or rotational movements, for example, to transmit a torque from a connecting piece formed integrally with the retaining ring or, in particular, connected by a material fit, to the second shaft section.

[0026] In a preferred embodiment of what has been described immediately above, it is provided that the retaining ring is screwed and / or pinned to the second shaft section away from its axis of rotation, in particular is screwed and / or pinned multiple times on a circumferential line. A screw connection in particular creates a frictional connection in the circumferential direction and axially secures the retaining ring to the second shaft section. A pin connection creates a positive connection in the circumferential direction between the retaining ring and the second shaft section. The torque that can be transmitted in the circumferential direction by the connection is determined by spacing the circumferential line from the axis of rotation of the shaft in the radial direction, in this respect positioning the screw connections or pin connections as far out as possible on the second shaft section is preferred. In particular, a radial position of the screw connections orPins, in particular the circumferential line, outside the diameter of the first shaft section so that the screw connections or pins are accessible.

[0027] As an alternative to the features described above, or in a preferred embodiment of the above, the first groove is provided on a lateral surface of the first shaft section, so that a normal direction of a base of the first groove is oriented radially. A normal direction is understood to be a direction perpendicular to a surface, here the base surface of the groove. As understood here, a groove is preferably designed such that it has a base and two lateral walls, i.e., is designed as a recess with a rectangular cross-section. It is within the understanding of the present disclosure that a cross-section of the first groove can also be designed differently, for example, as a triangular or round cross-section, in which case the spatial orientation of the groove, explained here with reference to the rectangular cross-section, is to be understood accordingly.Torque transmission is enabled by the first groove in such a way that the bottom surface extends deviating from a circumferential contour on the shaft and is in positive engagement with the connecting piece along its contour. The connecting piece then engages radially in the first groove. Advantageously, the connecting piece can then be connected in a simple manner to the retaining ring, which, for example, immediately surrounds the first groove radially on the outside or is arranged axially offset from the first groove, in order to transmit torque or rotational movement to the second shaft section via the retaining ring. In this case, engagement in the second shaft ring other than fixing the retaining ring to the second shaft section is not necessary.

[0028] In a preferred embodiment of what has been described immediately above, the connecting piece and the retaining ring are formed integrally with one another. A one-piece design is understood in particular to mean a monolithic design, wherein the retaining ring and the connecting piece are manufactured from one piece, for example a semi-finished product, or are formed together in a continuous process, for example cast or 3D printed. For example, the connecting piece is designed as an internal projection on the retaining ring, wherein the retaining ring then directly surrounds the first groove in the radial direction and the projection engages in the first groove. With a one-piece design of the retaining ring and the connecting piece, the shaft is formed from very few individual components and is therefore particularly inexpensive to manufacture.

[0029] As an alternative to features described immediately above or in a preferred embodiment of that described immediately above, it is provided that a plurality of first grooves, in particular symmetrical to one another, are arranged around the circumference of the outer surface, so that the shaft cross-section in the axial region of the first grooves forms in particular a polygon. In the simplest case, two first grooves are formed opposite one another on opposite sides of the outer surface or the shaft. This ensures that the center of mass of the shaft continues to lie in the axis of rotation in the region of the first grooves, so that concentricity of the shaft is ensured and a balancing process that might otherwise be necessary can be dispensed with. In particular, the cross-section is rectangular or has more than four corners.

[0030] As an alternative to what has been described immediately above, it is provided that the first groove is introduced on an end face of the first shaft section, so that a normal direction of a base of the first groove is axially oriented. It is further within the understanding of the present disclosure that a cross-section of the first groove can also be designed to deviate from the rectangular shape underlying the description here, for example as a triangular or round cross-section, in which case the spatial orientation of the groove explained here with reference to the rectangular cross-section is to be understood accordingly. Torque transmission is made possible by the first groove in such a way that lateral walls of the first groove extend on the shaft deviating from a circumferential contour and are in positive engagement with the connecting piece along their contour. The connecting piece then engages in the first groove axially.Advantageously, a first groove introduced in this way is open towards the second shaft section so that the connecting piece can extend towards the second shaft section for a positive connection and / or material connection there. In a preferred embodiment of the immediately above-described embodiment, the first shaft section has a second recess arranged orthogonally to the first groove in the axial region of the first groove, in particular a bore, wherein a securing means for axially holding the connecting piece on the first shaft section is arranged in the second recess. The axial region of the first groove is understood to be the region of the first shaft section over which the first groove projects in the axial direction into the first shaft section, i.e. the region between the end face of the first shaft section and the bottom surface of the first groove.In the simplest case, the recess is a hole that continues into the connecting piece, with a pin or screw extending through the first shaft section and the connecting piece as a securing means. This provides a simple way to axially secure the first shaft section to the connecting piece, or the connecting piece to the first shaft section, thus preventing the first shaft section from slipping axially off the connecting piece.

[0031] As an alternative to features immediately above or in a preferred embodiment of the immediately above, it is provided that a second groove is introduced into an end face of the second shaft section, so that a normal direction of a base of the second groove is axially oriented, and wherein the connecting piece engages positively in the second groove to establish the rotationally fixed connection. It is further within the understanding of the present disclosure that a cross section of the second groove can also be designed to deviate from a rectangular shape underlying the description here, for example as a triangular or round cross section, in which case the spatial orientation of the groove explained here with reference to the rectangular cross section is to be understood accordingly.Torque transmission is made possible by the second groove in such a way that lateral walls of the groove extend deviating from a circumferential contour on the shaft and are in positive engagement with the connecting piece along their contour. The connecting piece can then advantageously extend directly between the first groove in the first shaft section and the second groove in the second shaft section, whereby the grooves together form a continuous receptacle for the connecting piece. The transmission of torque or rotary movements then takes place exclusively directly via the connecting piece and is therefore particularly simple and reliable. In a preferred embodiment of what is immediately described above, the connecting piece is T-shaped, i.e. it extends within the first groove over the (smaller) diameter of the first shaft section and within the second groove over the (larger) diameter of the second shaft section.However, torque or rotational movement can still be transmitted even if the connecting piece in one of the shaft sections does not extend outward to the outer surface. The connecting piece can then be rectangular, for example.

[0032] In a preferred embodiment of the immediately above-described embodiment, the retaining ring is fixed in the axial direction to the second shaft section and secures the connecting piece against slipping out of the second groove. For this purpose, the retaining ring covers the connecting piece in the axial direction, for example, in the case of a T-shaped connecting piece in the region of the greater extension. The retaining ring can further secure the connecting piece in the radial direction to the first shaft section and / or the second shaft section or hold it in a form-fitting manner. The retaining ring thus achieves simple and secure fastening of the connecting piece in the second groove and / or the first groove.

[0033] As an alternative to the features described above, or in a preferred embodiment of the above, at least one of the shaft sections is designed as a hollow shaft. A hollow shaft has a central recess extending over its entire axial length and is therefore annular in cross-section. In particular, the central recess is simply cylindrical. By designing one of the shaft sections as a hollow shaft, a particularly lightweight shaft is created overall. In particular, the central recess of the hollow shaft, in the case of the second shaft section, is also suitable for engagement with the first shaft section, insofar as the diameter of the central recess corresponds to the diameter of the first shaft section, without the need for a separate recess.

[0034] As an alternative to the features described above, or in a preferred embodiment of the above, the second shaft section is designed as a hollow shaft, with a securing means for axially holding the first shaft section to the second shaft section extending axially through the second shaft section. Such a securing means is, in particular, a tensioning means or a screw connection. In this case, no further geometry, in particular no further recess, needs to be created on the shaft sections to provide axial securing besides the central recess.

[0035] The problem is further solved by an elevator system comprising at least one vertically extending elevator shaft, at least one car movable along the elevator shaft, at least one shaft designed as a drive shaft according to the above-described solution, at least one drive device coupled to the shaft, and at least one support means assigned to a car and received on the shaft. The above solution to the problem with an elevator system includes the teaching that the drive shaft is designed as a shaft described above, and the advantages described above in this regard are accordingly transferred to the elevator system. The elevator system is therefore particularly simple and cost-effective to manufacture.

[0036] In a preferred embodiment of the immediately above-described embodiment, the at least one support means is designed as a flat belt and wraps around the shaft at a contact surface in a frictionally engaged manner. In this way, the shaft, or a part of the shaft forming the contact surface, can be designed with a particularly small diameter, thus making the elevator system particularly compact. In particular, the compact design enables the shaft and / or the drive device to be installed in a confined shaft headroom.

[0037] Short description of the drawings

[0038] 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.

[0039] The drawings show

[0040] Fig. 1a is a perspective view of a section of a shaft in a first embodiment;

[0041] Fig. 1b is a perspective view of a section of the shaft according to Figure 1a; Fig. 2a is a perspective view of a section of a shaft in a second embodiment;

[0042] Fig. 2b is a perspective view of a section of the shaft according to Figure 2a;

[0043] Fig. 3a is a perspective view of a section of a shaft in a third

[0044] embodiment;

[0045] Fig. 3b is a perspective view of a section of the shaft according to Figure 3a;

[0046] Fig. 4a is a perspective view of a section of a shaft in a fourth

[0047] embodiment;

[0048] Fig. 4b is a perspective view of a section of the shaft according to Fig. 4a; and Fig. 5 is a highly schematic representation of an elevator system.

[0049] Detailed description of the drawings

[0050] 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.

[0051] Figures 1a and 1b show a shaft 1.1 in a first embodiment with a first shaft section 2.1 and a second shaft section 2.2, wherein the first shaft section 2.1 has a smaller diameter than the second

[0052] Shaft section 2.2. The shaft 1.1 spans a cylindrical coordinate system with an axial direction A, a radial direction R, and a circumferential direction U. On the second shaft section 2.2, a central recess 4 is arranged on an end face 3, into which the first shaft section 2.1 projects. Furthermore, on the first shaft section 2.1, on a lateral surface 5, two first grooves 6.1 are arranged, oriented orthogonally to a rotational axis DA of the shaft 1.1, into which grooves a connecting piece 7 engages. The connecting piece 7 is formed integrally with a retaining ring 8 and is covered by the retaining ring 8 in the radial direction R. The retaining ring 8 encompasses the first shaft section 2.1 in the circumferential direction U and bears against the end face 3 of the second shaft section 2.2. Furthermore, decentralized bores 9 are arranged on the second shaft section 2.2, to which the retaining ring 8 is secured by connecting means in a manner not shown in detail.The retaining ring 8 is fixed to the bores 9 at least in the circumferential direction U relative to the second shaft section 2.2.

[0053] Torque is transmitted between the first shaft section 2.1 and the second shaft section 2.2 in the shaft 1.1 by means of the connecting piece 7 and the retaining ring 8 through the positive connection between the first groove 6.1 and the connecting piece 7, as well as through the positive or frictional connection between the retaining ring 8 and the second shaft section 2.2 through the connecting means in the bores 9. The connecting piece 7 is also held axially on the first shaft section 2.1 in the first grooves 5.1. With respect to the second shaft section 2.1, either the retaining ring 8 is axially fixed by screwing, or the first shaft section 2.1 is axially fixed to the second shaft section 2.2.

[0054] Figures 2a and 2b show a second embodiment of a shaft 1.2 that essentially corresponds to shaft 1.1. The repetitive description of previously described features is omitted. Unlike shaft 1.1, the first shaft section 2.1 of shaft 1.2 has four first grooves 6.1, which together form a square residual cross-section of the first shaft section 2.1. The connecting piece 7 engages accordingly in all first grooves 6.1.

[0055] Figures 3a and 3b show a shaft 1.3 in a third embodiment. In the shaft 1.3, the first groove 6.1 is arranged on an end face 10 of the first shaft section 2.1, orthogonal to the axis of rotation DA of the shaft 1.1. The connecting piece 7 is formed separately from the retaining ring 8 and lies in the first groove 6.1 with a first section 7.1. The first section 7.1 extends over the entire diameter of the first shaft section 2.1. Furthermore, a second groove 6.2 is arranged in the second shaft section 2.2 on the end face 3, orthogonal to the axis of rotation DA of the shaft 1.1. The connecting piece 7 engages with a second section 7.2 in the second groove 6.2 and extends over the entire diameter of the second shaft section 2.2. The retaining ring 8 encompasses the first shaft section 2.1 and lies against the end face 3 of the second shaft section 2.2. The retaining ring 8 also covers the second section 7.2 of the connecting piece 7 and thus secures the connecting piece 7 axially in the second groove 6.2. In addition, the retaining ring 8 also secures the connecting piece 7 in the radial direction R by encompassing the first shaft section 2.1. The retaining ring 8 is in turn fastened to the end face 3 of the second shaft section 2.1 by means of connecting means (not shown in detail).

[0056] Shaft section 2.2 is fixed. For axially securing the first shaft section 2.1 relative to the connecting piece 7, a recess 11 formed as a bore is arranged in the first shaft section 2.1, through which a securing means (not shown in detail) passes, wherein the securing means holds the connecting piece 7 in a manner not shown in detail.

[0057] A torque transmission between the first shaft section 2.1 and the second shaft section 2.2 takes place in the shaft 1.3 by means of the connecting piece 7 and the retaining ring 8 through the positive connection between the first groove 6.1 and the

[0058] Connecting piece 7 and the positive connection between the second groove 6.2 and the connecting piece 7. The connecting piece 7 is further held axially on the first shaft section 2.1 by the securing means in the recess 11 and on the second shaft section 2.2 by the retaining ring 8 or other means not shown in detail.

[0059] Figures 4a and 4b show a second embodiment of a shaft 1.4 that essentially corresponds to shaft 1.3. The repetitive description of previously described features is omitted. Unlike shaft 1.3, in shaft 1.4, the first shaft section 2.1 extends into a central recess 4 of the second shaft section 2.2, where it is centered and radially held.

[0060] Figure 5 shows a highly schematic representation of an elevator installation 20 with an elevator shaft 21 running in the vertical direction V, in which a car 22 can be moved between landing positions not shown in detail. A drive device 23, which is designed, for example, as an electric machine, pneumatic machine, or hydraulic machine, is arranged in a shaft head 21.1. Furthermore, a brake 24, which is designed, for example, as an electric machine, mechanical brake, or eddy current brake, is arranged in the shaft head 21.1. A shaft 1.1, 1.2, 1.3, 1.4 with two first shaft sections 2.1 and a second shaft section 2.2 is arranged in the shaft head 21.1, and is rotatably connected to the drive device 23 and the brake 24 on a bearing (not shown in detail). Two redundant support elements 25.1, 25.2 are mounted on the second shaft section 2.2 for driving and braking respectively.The support elements 25.1, 25.2 are designed as flat belts and are each connected on a first side of the shaft 1.1, 1.2, 1.3, 1.4 to the elevator car 22 for driving the latter. On a second side of the shaft 1.1, 1.2, 1.3, 1.4, the support elements 25.1, 25.2 are each connected to a counterweight 26. The connection and guidance of the support elements 25.1, 25.2 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 1:2 suspension. The shaft 1.1, 1.2, 1.3, 1.4 is designed according to Figures 1a, 1b, 2a, 2b, 3a, 3b or 4a, 4b.

[0061] List of reference symbols

[0062] 1.1 Wave

[0063] 1.2 Wave

[0064] 1.3 Wave

[0065] 1.4 Wave

[0066] 2.1 first wave section

[0067] 2.2 second wave section

[0068] 3 Front side of the second shaft section

[0069] 4 central recess

[0070] 5 Shell surface of the first shaft section

[0071] 6.1 first groove on the first shaft section

[0072] 6.2 second groove on the second shaft section

[0073] 7 connecting piece

[0074] 7.1 first section of the connecting piece

[0075] 7.2 second section of the connecting piece

[0076] 8 Retaining ring

[0077] 9 Hole

[0078] 10 Front side of the first shaft section

[0079] 11 Recess

[0080] 20 elevator system

[0081] 21 Elevator shaft

[0082] 21.1 Shaft head of the elevator shaft

[0083] 22 car

[0084] 23 Drive device

[0085] 24 Brake

[0086] 25.1 first support means

[0087] 25.2 second support means

[0088] 26 Counterweight

[0089] A axial direction

[0090] DA rotation axis

[0091] R radial direction

[0092] U circumferential direction

Claims

Claims 1. Shaft (1.1, 1.4), in particular drive shaft for support means (25.1, 252) of a Elevator installation (20), comprising a first shaft section (2.1) with a first diameter; a second shaft section (2.2), which is axially adjacent to the first shaft section (2.1) and formed separately from the first shaft section (2.1), and has a second diameter, wherein the second diameter is larger than the first diameter; at least one connecting piece (7) for establishing a rotationally fixed connection between the first shaft section (2.1) and the second shaft section (2.2); and at least one retaining ring (8) surrounding the first shaft section (2.1) and fixed to the end face of the second shaft section (2.2) for fixing the connecting piece (7) relative to the second shaft section (2.2); wherein the first shaft section (2.1) has at least one first groove (6.1) running orthogonally to its axial extent; and wherein the connecting piece (7) is positively inserted into the first groove (6.1) to establish the rotationally fixed connection.1) intervenes.

2. Shaft (1.1, . . . , 1.4) according to claim 1, wherein the second shaft section (2.2) has a central first recess (4) on its end face and the first shaft section (2.1) projects into the central first recess (4).

3. Shaft (1.1, . . ., 1.4) according to claim 1 or 2, wherein the retaining ring (8) is fixed to the second shaft section (2.2) in the axial direction (A) and / or in the circumferential direction (U).

4. Shaft (1.1, . . . , 1.4) according to claim 3, wherein the retaining ring (8) is screwed and / or pinned to the second shaft section (2.2) away from its axis of rotation (DA), in particular is screwed and / or pinned several times on a circumferential line.

5. Shaft (1.1, . . . , 1.4) according to one of the preceding claims, wherein the first groove (6.1) is introduced on a lateral surface (5) of the first shaft section (2.1) so that a normal direction of a bottom of the first groove (6.1) is oriented radially.

6. Shaft (1.1, . . . , 1.4) according to claim 5, wherein the connecting piece (7) and the retaining ring (8) are formed integrally with one another.

7. Shaft (1.1, ..., 1.4) according to claim 5 or 6, wherein around the circumference of the A plurality of first grooves (6.1), in particular symmetrical to one another, are arranged on the lateral surface (5), so that the shaft cross-section in the axial region of the first grooves (6.1) forms in particular a polygon.

8. Shaft (1.1, ..., 1.4) according to one of claims 1 to 4, wherein the first groove (6.1) is introduced on an end face (10) of the first shaft section (2.1) so that a normal direction of a bottom of the first groove (6.1) is axially oriented.

9. Shaft (1.1, . . . , 1.4) according to claim 8, wherein the first shaft section (2.1) has a second recess (11), in particular a bore, arranged orthogonally to the first groove (6.1) in the axial region of the first groove (6.1), wherein in the second Recess (11) a securing means for axially holding the connecting piece (7) on the first shaft section (2.1) is arranged.

10. Shaft (1.1, . . ., 1.4) according to claim 8 or 9, wherein a second groove (6.2) is introduced on an end face (3) of the second shaft section (2.2) so that a normal direction of a bottom of the second groove (6.2) is axially oriented, and wherein the connecting piece (7) engages positively in the second groove (6.2) to establish the rotationally fixed connection.

11. Shaft (1.1, . . . , 1.4) according to claim 10, wherein the retaining ring (8) is fixed in the axial direction (A) to the second shaft section (2.2) and secures the connecting piece (7) in a form-fitting manner against slipping out of the second groove (6.2).

12. Shaft (1.1, . . . , 1.4) according to one of the preceding claims, wherein at least one of the shaft sections (2.1, 2.2) is designed as a hollow shaft.

13. Shaft (1.1, . . ., 1.4) according to one of the preceding claims, wherein the second shaft section (2.2) is designed as a hollow shaft, and wherein a securing means for axially holding the first shaft section (2.1) on the second shaft section (2.2) extends axially through the second shaft section (2.2).

14. Elevator installation (20), comprising at least one vertically extending elevator shaft (21); at least one elevator car (22.1, 22.2) movable along the elevator shaft (21); at least one shaft (1.1, . . ., 1.4) designed as a drive shaft according to one of the preceding claims; at least one drive device (23) coupled to the shaft (1.1, . . ., 1.4); and at least one drive device (23) assigned to a car (22.1, 22.2) and mounted on the shaft (1.1, . . . , 1.4) supporting means (25.1, 25.2).

15. Elevator installation (20) according to claim 11, wherein the at least one support means (25.1, 25.2) is designed as a flat belt and wraps around the shaft (1.1, ..., 1.4) at a contact surface in a frictionally engaged manner.

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