Belt drive shaft and belt drive device equipped therewith, and method and use

Abstract

In belt drive devices, the shaft by means of which at least one belt interacts is a relatively central and important component or machine element. On account of a relatively high material quality, on the one hand, and on account of a relatively high complexity of this machine element, on the other hand, even relatively small optimizations can noticeably have an effect also in the overall context of providing and operating belt drive devices. The invention relates to a belt drive shaft for a belt drive device, in particular of elevator systems, comprising a driving zone having one or more driving zone sections, which are designed to be coupled to a respective belt or which, as intended, each couple to a belt, wherein at least one of the driving zone sections is delimited by at least one ring-like machine element which is rotationally and axially fixedly seated on the shaft in the manner of a shoulder or a web and delimits the at least one driving zone section, preferably on both sides. This also makes it possible to achieve an advantageous compromise between costs, material use and variability. The invention also relates to a belt drive device equipped with such a belt drive shaft.

Description

[0001] Belt drive shaft and belt drive device equipped therewith, as well as method and use

[0002] TECHNICAL FIELD

[0003] The present invention relates to a belt drive shaft for a belt drive device, in particular of elevator systems, comprising a drive zone with one or more drive zone sections, each of which is configured to couple to a belt or which is intended to couple to a belt. Furthermore, the present invention relates to a method for producing or assembling such a belt drive shaft. Last but not least, the present invention also relates to the use of such a belt drive shaft in belt drive devices of elevator systems. In particular, the invention relates to a device and a method according to the preamble of the respective independent claim.

[0004] BACKGROUND OF THE INVENTION

[0005] Belt drives use belts in many different applications which must be guided in a drive zone for or to transmit the drive movement, for example multiple belts in directly adjacent drive zone sections of the same belt drive shaft. The drive zone or the individual drive zone sections are separated from one another, for example, by radial circumferential elevations. According to the state of the art, the shaft is advantageously provided or manufactured from a single piece (solid), i.e. the starting material must have a comparatively large diameter, particularly since the shaft is usually dimensioned with regard to a minimum drive zone diameter, at least in applications such as elevator systems. In other words: the drive zone or the radial circumferential elevations for the (axial) delimitation of the drive zone represent the largest diameter of the shaft.This leads to costly shaft designs, not least because complex post-processing, such as comparatively extensive machining operations, may be required in the area of ​​a high-quality radially outer material zone. Therefore, there is interest in a more advantageous concept for the design of the shaft of belt drives, particularly for elevator systems.

[0006] By way of example, the publications CN 218988523 U and CN 211141249 U can be mentioned, which each describe a shaft for a belt drive for elevator systems, wherein the shaft is axially subdivided by radially projecting extensions, wherein between the radially projecting extensions in each case an advantageously spherically designed drive zone is formed for interaction with at least one belt.

[0007] Based on the state of the art, there is a need for an innovative design or further development of the shaft, particularly with regard to advantageously lean material use and (post-)processing effort.

[0008] SUMMARY OF THE INVENTION

[0009] The object is to provide a shaft for belt drives, particularly in elevator systems, by means of which at least one drive zone for a belt can be advantageously defined. It is also the object to design such a belt drive shaft in such a way that the definition of the desired axial effective range of a respective belt can be ensured in a particularly advantageous manner. Last but not least, the object is to design a shaft specifically for belt drives in elevator systems in such a way that, with the least possible use of material, a high degree of design variability can be ensured, including with regard to the axial limitation of at least one drive zone section.

[0010] This object is achieved by a belt drive shaft according to claim 1 and by a method according to the independent method claim and by uses according to the independent use claim. Advantageous developments of the invention are explained in the respective subclaims. The features of the exemplary embodiments described below can be combined with one another unless this is explicitly denied. Provided is a belt drive shaft for a belt drive device, in particular of elevator systems, comprising a drive zone with one or more drive zone sections, which are each configured to couple with a belt or which are each intended to couple with a belt;

[0011] According to the invention, it is proposed that at least one of the drive zone sections is delimited by at least one ring-like machine element which sits on the shaft in the manner of a shoulder or web in a rotationally and axially fixed manner and delimits the at least one drive zone section, preferably on both sides. This promotes comparatively low material usage and also enables comparatively great variability, e.g. with regard to the height of the shoulder or web (or, accordingly, the radial circumferential elevations). This also allows a considerable amount of material to be saved, in particular if the radial circumferential elevations provided as standard for the corresponding application are to protrude several millimeters radially, e.g. in the range of 3 to 5 mm (the diameter variation of the shaft is then in the range of 6 to 10 mm), and if the drive zone diameter is comparatively large.

[0012] Accordingly, the invention is also based on the concept of designing a shaft that is advantageously one-piece with regard to the power transmission function as a multi-part shaft by adding the annular machine elements described here, without having to forego the advantages associated with the solid / one-piece design. Of course, the shaft can optionally also be divided into further components; those skilled in the art will recognize that, based on the present disclosure, a one-piece shaft can be designed in a cost- and material-optimized manner by providing only the radial circumferential elevations (shoulders and optionally at least one web) as separate annular machine elements and advantageously connecting them to the shaft (outer) surface in a purely force-fitting manner.

[0013] According to the present disclosure, the drive zone is understood to mean, in particular, the at least one axial section of the shaft provided for interaction with the at least one belt. The drive zone can optionally have only one or also several drive zone sections, optionally directly adjacent to one another, or optionally arranged on different axial sections of the shaft. Each drive zone section is configured for coupling with a respective belt, and each drive zone section is advantageously axially delimited to define the desired position or the axial effective range of the corresponding belt. According to the present invention, the axial delimitation can advantageously be achieved by the ring-like machine elements described here.

[0014] In other words, the invention can also be generally described as follows: The drive zone delimitation described here by means of separate machine elements between the individual drive zone sections makes it possible to produce the (belt drive) shaft starting from a semi-finished product with a comparatively small diameter. The raw material of the shaft does not have to be unnecessarily large in diameter; in particular, approximately 8 mm in diameter or 4 mm in radius can be saved. Furthermore, thanks to the separate design of the ring-like machine elements, the color highlighting of rotating parts within the belt drive device can be made easier; in particular, subsequent color application can be dispensed with.The shaft described here with its multi-part design of the annular demarcation of the drive zone sections enables, for example, the ring-like machine elements to be made of aluminum, i.e., material optimization and material variation also with regard to a favorable material for the shaft itself. In this case, a yellow highlight can be realized on the anodized aluminum rings. For example, the ring-like machine elements are mechanically or thermally joined to / on the shaft, e.g., pressed or shrunk. The ring-like machine elements can easily reproduce the desired (cross-sectional) contour of the corresponding shaft shoulder or shaft web, i.e., the contour can correspond to that of one-piece shafts, i.e., can be easily reproduced 1:1 by the joined rings.The desired technical effect of separating the individual belts from one another can also be achieved in the same way using the ring-like machine elements described here, i.e., as with one-piece shafts with integrally formed shoulders and webs. Last but not least, cost savings can be realized in connection with the production of the respective shaft (smaller raw material diameter, less machining work). The ring-like machine elements can optionally also be designed as identical parts, so that the cost structure can be further optimized and assembly is also less complex (e.g., with shafts with two or three belt drive zone sections, i.e., two shoulders and one or two webs, i.e., three or four joined ring-like machine elements).

[0015] According to one embodiment, the at least one ring-like machine element is arranged in the manner of a shoulder at at least one of the axial ends of the drive zone. This also enables a lateral axial delimitation of the (entire) drive zone, particularly in the region of a shoulder and / or bearing seat of the shaft, particularly in a configuration in which the drive zone (apart from the ring-like machine elements described here) has the largest outer diameter of the shaft.

[0016] According to one embodiment, the at least one ring-like machine element is arranged in the manner of a web between two adjacent drive zone sections. This also enables a subdivision between two adjacent drive zone sections. In a web-like arrangement, the ring-like machine element can divide the drive zone into two drive zone sections, so that the respective belt couples to the shaft in an axial section, axially separated from at least one other adjacent belt.

[0017] According to one embodiment, all drive zone sections of the belt drive shaft are defined by at least one corresponding ring-like machine element, wherein the ring-like machine elements are designed as identical parts (e.g., three ring-like machine elements for two drive zone sections, or four ring-like machine elements for three drive zone sections). This simplifies the assembly of the shaft and can also further reduce costs, particularly thanks to the minimal number of different parts.

[0018] According to one embodiment, the at least one ring-like machine element is configured as a ring for a thermally or mechanically joined connection, in particular a fit. This geometric and dimensional coordination of corresponding contact surfaces also promotes a purely force-fitting assembly (in particular based on static friction in the joined state). In this respect, the at least one ring-like machine element advantageously has an inner circumferential surface that couples or is configured to couple force-fittingly with the (outer) circumferential surface of the shaft.

[0019] According to one embodiment, the belt drive shaft is designed as a single piece, i.e., integrally, except for at least one ring-like machine element. With such a shaft design, the cost and material savings advantages described here are particularly noticeable.

[0020] According to one embodiment, a seat or connection between the belt drive shaft and the corresponding ring-like machine element is a thermally joined connection or a corresponding seat, in particular in the form of a fit. A connection brought about by thermal measures, e.g., a connection created by shrinking or a press fit, offers the advantage of a particularly flexible and time-efficient assembly process; the initially separate ring-like machine elements (even three or more) can be preheated in an oven and pushed onto the shaft at the appropriate time. After a few moments, the (press) fit is created there in the desired axial position during cooling and the associated contraction. Optionally, alternatively or additionally, the shaft can also be cooled (alternatively, the respective machine element can be joined at / to room temperature, with the shaft cooled).A thermally joined connection can also have the advantage that disassembly of the corresponding ring-like machine element can be made easier, in particular by thermal means (in particular based on different expansion coefficients of the materials of the material pairing shaft and ring-like machine element).

[0021] According to one embodiment, the connection between the belt drive shaft and the corresponding ring-like machine element is a mechanically joined connection or a corresponding seat. A connection created by mechanical means, e.g., a connection created by pressing, also offers the advantage of a relatively precisely predeterminable axial position on the shaft during pressing, for example, especially at the axial positions of the shoulders. In a central region of the drive zone, for example, thermal joining (diameter enlargement) may be preferred, and the lateral (end) rings (particularly close to the bearings) can advantageously be pressed.

[0022] According to one embodiment, the belt drive shaft has a larger diameter in the area of ​​the respective seat than in adjacent axial sections, in particular the largest diameter of the belt drive shaft, in particular a diameter that is no more than 5% or no more than 1 mm, in particular no more than 0.5 mm larger than the (maximum) diameter of the drive zone. This can also facilitate surface finishing / coating in the area of ​​the seats and also simplify assembly (in particular, optionally mechanical and / or thermal joining in the area of ​​the shoulders and / or webs).

[0023] According to one exemplary embodiment, the belt drive shaft is / was subjected to a surface treatment in the area of ​​the respective seat, in particular with a view to achieving the highest possible static friction force between the abutting circumferential surfaces. This also enables even further optimization of the interaction between the shaft circumferential surface and the inner circumferential surface of the corresponding ring-like machine element. In other words: In the area of ​​the respective seat, a different surface finish than within the respective drive zone section can be advantageous. For example, the respective drive zone section is slightly crowned, thus decreasing in radius towards the web / shoulder, so that the surface of the seat protrudes at least slightly radially.

[0024] According to one embodiment, the outer surface area of ​​the respective seat is tempered, in particular surface-hardened, particularly with respect to a predefined hardness. Surface treatment / tempering of the shaft exterior (at least in the area of ​​the contact surfaces) and the ring interior can improve the quality, particularly with respect to the risk of so-called fretting corrosion, especially when the overlap between ring and shaft (negative value) is greater than bending during operation. For example, a nitriding process can be used to increase resistance to wear and corrosion, particularly with a predefined surface roughness at least in the area of ​​the contact surface(s).

[0025] According to one exemplary embodiment, the belt drive shaft has a larger diameter in the region of a seat for a ring-like machine element (shoulder) to be arranged at one axial end of the drive zone than in the adjacent drive zone section, wherein the belt drive shaft has a larger diameter in the region of a seat for a ring-like machine element (web) to be arranged between two drive zone sections than in the adjacent drive zone sections, in particular the largest diameter of the belt drive shaft. This can also facilitate the application-specific design of the respective surface as well as assembly. Of course, the diameter variation may remain minimal, particularly with regard to a material-saving design of the semi-finished product for the shaft.

[0026] According to one embodiment, the at least one ring-like machine element can be reversibly mounted (and dismounted) on the belt drive shaft, in particular with a press fit, in particular thermally or mechanically joined. This also enables subsequent adaptation, customization, or modification, e.g., with regard to the height of the radially circumferential elevations and / or with regard to the width of the respective drive zone section (and / or its axial position).

[0027] According to one exemplary embodiment, the at least one ring-like machine element is joined to the corresponding seat of the belt drive shaft in such a way that a rotationally / axially fixed (at least substantially) force-locking connection is ensured, in particular through static friction on adjacent lateral surfaces. This also promotes a comparatively uncomplicated assembly procedure and a comparatively high level of robustness. In this respect, the joining according to the present disclosure is also to be understood as a permanent connection of two geometrically predefined bodies (shaft and ring-like machine element) in the region of mutually force-locking / adhering lateral surfaces, advantageously based on material-elastic bracing and holding effects, advantageously entirely without additional adhesive, i.e. without the need to create a material-to-material connection.

[0028] According to one embodiment, the at least one ring-like machine element is made of metallic material, in particular aluminum, preferably anodized aluminum. This also provides a good compromise between robustness, corrosion resistance, thermal properties, weight, material costs, and advantageous material pairing.

[0029] According to one embodiment, the at least one ring-like machine element is highlighted in color relative to the belt drive shaft, particularly in a signal color (e.g., yellow, red). This also facilitates a comparatively simple highlighting of rotating parts, particularly the radially outermost parts / sections of the shaft.

[0030] The aforementioned object is also achieved by a belt drive device with a belt drive shaft according to the present disclosure. This results in the aforementioned advantages, particularly with regard to the comparatively large masses to be displaced in elevator systems and the comparatively high speeds of the belt movement, as well as the comparatively high demands on the (material) quality of the shaft. The belt drive device has, for example, a brake unit on one (end) side of the shaft and a drive unit (motor) on the other (end) side of the shaft and is advantageously designed for interaction with at least two, three, or four belts.

[0031] The aforementioned object is also achieved by an elevator system with at least one belt drive shaft according to the present disclosure. This results in the aforementioned advantages, in particular with regard to a targeted further (optionally application-specific) optimization of a central, important component (drive shaft) of the entire elevator system. The belt drive device has, for example, a belt drive shaft with three or four drive zone sections and correspondingly four or five ring-like machine elements and is advantageously designed for interaction with a corresponding number of belts, in particular for the purpose of displacing at least one elevator car.

[0032] The above-mentioned object is also achieved by a method according to the corresponding independent method claim, namely by an assembly method for assembling a belt drive shaft of a belt drive device of elevator systems, in particular a belt drive shaft according to the present disclosure, comprising the steps:

[0033] -Step (S1): Providing a / the belt drive shaft with at least two seats for ring-like machine elements for the arrangement delimiting a / the drive zone of the belt drive shaft;

[0034] -Step (S2): Providing at least two ring-like machine elements adapted for (preferably thermal or mechanical) joining to the shaft in the region of one of the seats;

[0035] Step (S3): Joining the ring-like machine element and the shaft, preferably thermally or mechanically, in the area of ​​the corresponding seat to axially define the drive zone. This results in the aforementioned advantages, particularly with regard to a symbiosis of advantageous robustness, advantageous variability, and an advantageous shaft assembly method.

[0036] Whenever "joining" or "joined" is generally referred to in the present disclosure, this refers in particular to thermal joining and / or mechanical joining, each for permanent connection, in particular for forming a rotationally / axially fixed, force-locking connection (i.e., without the need for additional form-locking contours, at least without macroscopic form-locking contours). Advantageously, neither form-locking nor material bonding is provided. Joining therefore also implies that the joining partners (shaft and ring-like machine element) are precisely matched to one another geometrically and in terms of size, particularly in the area of ​​the contacting lateral surfaces.

[0037] According to one embodiment, thermal joining is performed during the joining process for at least one ring-like machine element of the belt drive shaft. According to one embodiment, mechanical joining is performed during the joining process for at least one ring-like machine element of the belt drive shaft.

[0038] According to one embodiment, the axial section of the shaft intended for the respective ring-like machine element (i.e., the corresponding seat) is surface-machined and / or surface-hardened, particularly with a view to maximizing static friction effects. This also favors a functionality similar to a one-piece integral shaft, which, however, is strictly speaking constructed in multiple parts due to the ring-like machine elements initially provided separately.

[0039] The aforementioned object is also achieved by a belt drive shaft described here, which is manufactured by thermally or mechanically joining the at least one ring-like machine element to a predefined axial section of the belt drive shaft to laterally delimit at least one drive zone section of the drive zone of the belt drive shaft. Based on the aforementioned advantages, this also enables a symbiosis of advantageous robustness, advantageous variability, and an advantageous manner of shaft assembly.

[0040] The aforementioned object is also achieved by using ring-like machine elements for delimiting a drive zone or multiple drive zone sections of a belt drive shaft, in particular a belt drive shaft according to the present disclosure, in a belt drive device of an elevator system, wherein the respective ring-like machine element is / will be joined to the shaft in a rotationally and axially fixed manner in the manner of a shoulder or a web, in particular thermally and / or mechanically joined. This allows the aforementioned advantages to be realized, in particular with regard to an advantageous symbiosis of a substantially one-piece shaft and a material- and resource-saving structural design, as well as a high degree of variability / flexibility with regard to the subdivision of the drive zone.

[0041] Summary: In belt drive devices, the shaft, by means of which at least one belt interacts, is a comparatively central and important component or machine element. On the one hand, due to the comparatively high material quality and, on the other hand, due to the comparatively high complexity of this machine element, even comparatively small optimizations can have a noticeable effect in the overall context of the provision and operation of belt drive devices. The invention relates to a belt drive shaft for a belt drive device, in particular of elevator systems, comprising a drive zone with one or more drive zone sections, which are designed to be coupled to a respective belt orwhich are each intended to couple to a belt, wherein at least one of the drive zone sections is delimited by at least one ring-like machine element, which sits on the shaft in a rotationally and axially fixed manner in the manner of a shoulder or web and delimits the at least one drive zone section, preferably on both sides. This also makes it possible to achieve an advantageous compromise between cost, material usage, and variability. The invention also relates to a belt drive device equipped with such a belt drive shaft.

[0042] SHORT DESCRIPTION OF THE CHARACTERS

[0043] The invention is described in more detail in the following drawing figures. Reference numbers not explicitly described in a particular drawing figure refer to the other drawing figures. They show:

[0044] Figure 1 shows a perspective side view of a belt drive shaft according to one embodiment, in a schematic representation in an assembly phase; Figures 2 and 3 each show a perspective side view of a belt drive shaft according to a further embodiment, already assembled or with ring-like machine elements already joined;

[0045] Figure 4 shows a sectional view of a belt drive shaft according to a further embodiment;

[0046] Figure 5 shows a perspective side view of a belt drive device having a belt drive shaft according to embodiments;

[0047] Figure 6 shows a side view in a schematic representation of an elevator system with at least one belt drive device having a belt drive shaft according to exemplary embodiments; Figure 7 shows a schematic representation of steps of an assembly method for producing a belt drive shaft according to exemplary embodiments;

[0048] DETAILED DESCRIPTION OF THE FIGURES

[0049] The invention will first be explained with general reference to all reference numerals and figures. Special features or individual aspects of the present invention will be discussed in connection with the respective figure.

[0050] A belt drive shaft 10 is provided, in particular for a belt drive device 5 of an elevator installation 1, comprising a drive zone 11 with one or more drive zone sections 11.1, each of which is configured to couple to a belt 3. For example, the shaft 10 interacts with two or three belts 3, which displace an elevator car 7 or corresponding counterweights (not shown here) within an elevator shaft 9. The at least one drive zone section 11.1 is delimited by at least one ring-like machine element 15, which is seated on the shaft 10 in a rotationally and axially fixed manner in the manner of a shoulder 15a or a web 15b (each formed by a ring-like machine element seated on the shaft) and delimits the drive zone section 11.1 on at least one side. The ring-like machine element 15 can optionally form a shoulder 15a at an axial end 12 of the drive zone 11, or a web 15b between two drive zone sections 11.1.On the (outer) circumferential surface of the shaft 10, a seat 13 is advantageously provided for at least substantially frictional interaction with the corresponding ring-like machine element 15, optionally with a surface-treated circumferential surface region 13.1. The seat 13 can also be provided on a web-like (integral) axial section 14 of the shaft 10 that projects at least minimally / slightly radially. The respective ring-like machine element 15 is advantageously designed as a ring with an at least approximately cylindrical inner circumferential surface 15.1.

[0051] Optionally, a shoulder (particularly radially projecting, in the manner of a step) can also be formed on the at least minimally / slightly protruding web-like (integral) axial section 14 (contact surface of the shaft), which is geometrically configured to correspond to a shoulder formed on the inner surface 15.1 of the ring-like machine element 15 (particularly in the manner of a recess extending radially inward), serving as a positioning stop in the axial direction. This facilitates assembly in the desired axial position, whether with thermal and / or mechanical connection of the shaft and the ring-like machine element 15.

[0052] In addition to the drive zone 11, further sections of the shaft 10 can be provided for interaction with drive train components, in particular a first positive-locking section 17 (toothing section or key section) for interaction with a motor and a second positive-locking section 17 (toothing section or key section) for interaction with a brake unit. Between such a positive-locking section 17 and the drive zone, a bearing seat or a bearing surface 18 (axial section of the shaft for receiving a bearing) can be provided, in particular adjacent to a shaft shoulder 19 or directly adjacent to a / the corresponding shoulder 15a or to the corresponding axial end 12 of the drive zone 11.

[0053] The following diameter reference numbers, particularly indicated in Fig. 4, facilitate the understanding of the advantageous design concept described here: Dl 1 diameter of the driving zone, D13 diameter of the corresponding seat 13 for the respective ring-like machine element, Dl 5 diameter in the area of ​​the (respective) shoulder 15a or in the area of ​​the web, D17 diameter of the form-fitting section.

[0054] In the figures, the radial direction is indicated by the reference symbol (r), and the longitudinal direction corresponding to the main extension direction of the shaft 10 is indicated by the reference symbol (x).

[0055] Fig. 1 illustrates a belt drive shaft 10 with two drive zone sections 11.1, wherein the drive zone sections 11.1 are each axially delimited on both sides by rings 15 (ring-like machine elements). The rings 15 therefore form two shoulders 15a and a web 15b. In Fig. 1, one of the intended three rings is not shown, in particular because an assembly phase is shown in which the second ring 15 is first joined (intended to form the web 15b). Fig. 2 shows a further embodiment with two drive zone sections 11.1; the three rings 15 are already joined. The shaft 10 has two form-fitting sections 17. The two bearing seats 18 are arranged axially directly adjacent to the shoulders 15a formed by the rings 15 and the corresponding shaft shoulder 19.

[0056] Fig. 3 shows a further embodiment with three drive zone sections 11.1; accordingly, two shoulders 15a and two webs 15b are formed on the shaft 10 by the rings 15.

[0057] In Fig. 4, with reference to a further embodiment of a shaft with two drive zone sections 11.1, it can be seen that the drive zone diameter Dl 1 is at least approximately the largest diameter of the shaft, optionally slightly exceeded by the diameter D13 of the seat 13 provided for the respective ring 15 or of a correspondingly machined / tempered outer surface 13.1. In Fig. 4, the respective belt 3 interacting with the drive zone 15 is shown sectioned at only one point (circumferential position on top of the shaft), in particular since the wrap angle of the belt 3 around the shaft 10 does not necessarily have to be >=180°.

[0058] Fig. 5 shows a belt drive device 5 with a motor and brake unit, with the drive zone (or the individual drive zone sections 11.1) mounted between the motor and the brake unit. At least one centrally arranged ring 15 forming a web 15b is visible.

[0059] In Fig. 6, an elevator installation 1 is sketched in which a / the belt drive device 5 interacts with at least one belt 3 for displacing at least one elevator car 7 within the elevator shaft 9.

[0060] Fig. 7 illustrates steps S1, S2, S3 of an assembly method for producing the shaft 10 described here, in particular in the following embodiment: -Step S1: Providing a / the belt drive shaft with at least two seats for ring-like machine elements for the arrangement delimiting a / the drive zone of the belt drive shaft; -Step S2: Providing at least two ring-like machine elements configured for joining to the belt drive shaft, each in the region of one of the seats;

[0061] - Step S3: Joining the corresponding ring-like machine element and the

[0062] Belt drive shaft, preferably thermal or mechanical joining, in the area of ​​the corresponding seat, for axial limitation of the drive zone.

[0063] Based on this, the expert can further develop the process, e.g. by adding additional (intermediate) steps.

[0064] List of reference symbols

[0065] I Elevator system

[0066] 3 straps

[0067] 5 Belt drive device

[0068] 7 elevator car

[0069] 9 Elevator shaft

[0070] 10 Belt drive shaft

[0071] II Drifting zone

[0072] 11.1 Driving zone section

[0073] 12 axial end of the driving zone

[0074] 13 Seat for ring-like machine element

[0075] 13.1 optional surface-coated shell surface area

[0076] 14 radially projecting web-like axial section for seat

[0077] 15 ring-like machine element, in particular ring

[0078] 15.1 Inner surface

[0079] 15a Shoulder (formed by a ring-like machine element sitting on the shaft)

[0080] 15b Web (formed by a ring-like machine element sitting on the shaft)

[0081] 17 Form-fitting section, in particular toothing section

[0082] 18 Bearing seat / surface (axial section of the shaft for accommodating a bearing)

[0083] 19 wave heel

[0084] Dl 1 Diameter of the driving zone

[0085] D 13 Diameter of the corresponding seat for the respective ring-like machine element

[0086] Dl 5 diameter in the area of ​​the (respective) shoulder or in the area of ​​the bridge

[0087] D17 Diameter of the form-fitting section

[0088] 51 first step of the assembly process

[0089] 52 second step of the assembly process

[0090] 53 third step of the assembly process r radial direction x longitudinal direction (main extension direction of the shaft)

Claims

Patent claims 1. Belt drive shaft (10) for a belt drive device (5), in particular of elevator systems (1), comprising a drive zone (11) with one or more drive zone sections (11.1), which are designed to be coupled to a respective belt (3), characterized in that at least one of the drive zone sections (11.1) is delimited by at least one ring-like machine element (15) which, in the manner of a shoulder (15a) or a web (15b), is seated on the belt drive shaft (10) in a rotationally and axially fixed manner and delimits the drive zone section (11.1).

2. Belt drive shaft (10) according to claim 1, wherein the at least one ring-like machine element (15) is arranged in the manner of a shoulder (15a) at at least one of the axial ends of the drive zone (11); and / or wherein the at least one ring-like machine element (15) is arranged in the manner of a web (15b) between two adjacent drive zone sections (11.1); and / or wherein all drive zone sections (11.1) of the belt drive shaft are delimited by at least one corresponding ring-like machine element (15), wherein the ring-like machine elements are designed as identical parts.

3. Belt drive shaft (10) according to one of the preceding claims, wherein the at least one ring-like machine element (15) is designed as a ring for a thermally or mechanically joined connection.

4. Belt drive shaft (10) according to one of the preceding claims, wherein the belt drive shaft, apart from the at least one ring-like machine element (15), is designed as a single piece, i.e., is integrally constructed; and / or wherein a / the seat corresponding to a / the connection between the belt drive shaft (10) and the corresponding ring-like machine element (15) is a thermally joined connection; and / or wherein the connection between the belt drive shaft (10) and the corresponding ring-like machine element (15) is a mechanically joined connection.

5. Belt drive shaft (10) according to one of the preceding claims, wherein the belt drive shaft (10) has a larger diameter in the region of the respective seat than in adjacent axial sections, in particular the largest diameter of the belt drive shaft, in particular a diameter that is at most 5% or at most 1 mm larger than the diameter of the drive zone (11); and / or wherein the belt drive shaft is / was subjected to surface treatment in the region of the respective seat, in particular with regard to the highest possible static friction force between the adjacent lateral surfaces; and / or wherein the lateral surface region of the respective seat of the belt drive shaft (10) is tempered, in particular surface-tempered, in particular with regard to a predefined hardness.

6. Belt drive shaft (10) according to one of the preceding claims, wherein the belt drive shaft has a larger diameter in the region of a / the seat for a ring-like machine element (15, 15a) to be arranged at an axial end of the drive zone than in the adjacent drive zone section (11.1), and wherein the belt drive shaft has a larger diameter in the region of a / the seat for a ring-like machine element (15, 15b) to be arranged between two drive zone sections (11.1) than in the adjacent drive zone sections, in particular the largest diameter of the belt drive shaft.

7. Belt drive shaft (10) according to one of the preceding claims, wherein the at least one ring-like machine element (15) is reversibly (dis)mountable on the belt drive shaft, in particular with a press fit, in particular thermally or mechanically joined; and / or wherein the at least one ring-like machine element (15) is joined to the corresponding seat of the belt drive shaft (10) in such a way that a rotationally / axially fixed, non-positive connection is ensured, in particular by static friction on adjacent lateral surfaces (13.1, 15.1).

8. Belt drive shaft according to one of the preceding claims, wherein the at least one ring-like machine element (15) consists of metallic material, in particular of aluminum, preferably of anodized aluminum; and / or wherein the at least one ring-like machine element (15) is highlighted in color compared to the belt drive shaft (10), in particular in a signal color.

9. Belt drive device (5) with a belt drive shaft (10) according to one of the preceding claims.

10. Elevator installation (1) with at least one belt drive shaft (10) according to one of claims 1 to 8.

11. Assembly method for assembling a belt drive shaft (10) of a belt drive device (5) of an elevator installation (1), in particular a belt drive shaft according to one of claims 1 to 8, comprising the steps: -Providing a / the belt drive shaft with at least two seats (13) for ring-like machine elements (15) for the arrangement delimiting a / the drive zone (11) of the belt drive shaft (10); -providing at least two ring-like machine elements (15) adapted to be joined to the belt drive shaft (10) in the region of one of the seats (13); -Joining the corresponding ring-like machine element (15) and the belt drive shaft (10), preferably thermal or mechanical joining, in each case in the region of the corresponding seat (13), for axially limiting the drive zone.

12. Assembly method according to the preceding method claim, wherein the joining of at least one ring-like machine element (15) of the belt drive shaft is a thermal joining.

13. Assembly method according to one of the preceding method claims, wherein the joining of at least one ring-like machine element (15) of the belt drive shaft is a mechanical joining.

14. Belt drive shaft (10) according to one of claims 1 to 8, produced by thermal or mechanical joining of the at least one ring-like machine element on a predefined axial section of the belt drive shaft for laterally delimiting at least one drive zone section of the drive zone of the belt drive shaft.

15. Use of ring-like machine elements (15) for delimiting a drive zone (11), in particular a plurality of drive zone sections (11.1) of a belt drive shaft (10), in particular a belt drive shaft according to one of claims 1 to 8, in a belt drive device (5) of an elevator installation (1), wherein the respective ring-like machine element (15) is / is joined to the belt drive shaft (10) in the manner of a shoulder (15a) or a web (15b) in a rotationally and axially fixed manner, in particular is / is joined thermally and / or mechanically.

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