Drive train assembly for a belt drive unit of a lift system and correspondingly designed shaft and use thereof

Abstract

In the design of drive trains for lift systems, an advantageous balance between necessary resources and achievable technical (power) data is desirable. In particular, in drive trains with a belt drive, the shaft interacting with at least one belt in a drive zone requires constructional optimisation in order to be able to utilise improvement potential in terms of other components in the drive train. According to the invention, the shaft has at least one section bordering the drive zone with a diameter depending on the drive zone diameter, wherein the drive zone diameter is greater than this section by an advantageous factor. In this way, a particularly advantageous sizing can be achieved based on an interdependency between the diameters, in particular in terms of an optimum relating to both the material processing requirements and smallest possible dimensions, wherein, on this basis, the respective drive train can be easily designed for different applications.

Description

[0001] Drive train arrangement for a belt drive unit of an elevator system as well as correspondingly designed shaft and its use

[0002] TECHNICAL FIELD

[0003] The present invention relates to a drive train arrangement for a belt drive unit of an elevator system, comprising a shaft mounted in a housing, on which a drive zone is configured for at least one belt interacting with a / the belt drive unit. The drive zone has a drive zone diameter, and the shaft has at least one section whose diameter is dimensioned depending on the drive zone diameter. Furthermore, the present invention relates to a correspondingly configured shaft and its use. In particular, the invention relates to a drive train arrangement according to the preamble of the independent claim.

[0004] BACKGROUND OF THE INVENTION

[0005] For traction machines for elevator systems, a material-efficient and space-saving design is also of interest; this also applies to traction machines with belt drives, here generally referred to as belt drives or belt drives. A belt drive for an elevator system has a shaft with a drive zone mounted in a housing, over which the belt is guided and the torque from the shaft is transmitted. The shaft is mounted or supported in bearings on both sides of the drive zone. The aim is to determine a suitable design for the drive train, on the one hand with regard to assembly and bearings of the shaft, and on the other hand with regard to material usage and space requirements, whether general or application-specific. The belt used / usable is determined in particular by performance parameters, so that the designer's task is, among other things, to design the shaft orto design the entire drive train for different power levels or different applications in such a way that it is as scalable as possible or to provide a design guideline that is as generally applicable as possible so that all of the above-mentioned requirements can be met synergistically if possible.

[0006] According to the state of the art, the shaft with drive zone is provided in a more or less standardized configuration. Based on this, there is interest in an improved way of designing the drive train, i.e., in a technical teaching that enables optimization of the design of the shaft in particular. The following publications describe advantageous measures in connection with belt drives, in particular regarding the relative size of the respective belt and its interaction with the respective drum or shaft: US 2002 / 0 100 902 Al, US 2015 / 0 353 325 Al, CN 1 01 349 023 A, CN 2 03 486 710 U.

[0007] Based on the current state of the art, there is a clear need for further design optimization of the drive train of a belt drive for elevator systems, particularly with regard to the dimensions of the shaft. Last but not least, there is also interest in a scalable technical approach for (design) optimization of the shaft, particularly with regard to potential savings in the resources used for construction.

[0008] SUMMARY OF THE INVENTION

[0009] The objective is to provide a drive train assembly in which the shaft is advantageously designed and dimensioned from a structural point of view, particularly with regard to material and cost-effectiveness. It is also necessary to design the shaft of a drive train assembly, particularly for elevator systems, in such a way that the shaft interacts advantageously with other components of the drive train and can be installed in an advantageous manner.

[0010] This object is achieved by a drive train arrangement according to claim 1, as well as by a shaft designed therefor and its use according to the respective independent patent claim. Advantageous further 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 explicitly stated otherwise.

[0011] A drive train arrangement is provided for a belt drive unit of an elevator installation, comprising a shaft mounted in a housing, on which shaft a drive zone is configured for at least one belt cooperating with a / the belt drive unit, wherein the drive zone has (at least) one drive zone diameter, wherein the shaft has at least one section whose diameter is dimensioned as a function of the drive zone diameter (diameter of the running surface of the belt);

[0012] According to the invention, it is proposed that the drive zone diameter be larger, according to at least one predefined factor, than a shaft diameter in a first and / or second bearing section for bearings delimiting the drive zone, in particular also larger than a shaft diameter at the respective shaft end. In other words, the drive zone diameter is larger, according to at least one predefined factor, than a shaft diameter at least in a section adjacent to the drive zone (apart from any shoulders delimiting the drive zone), in particular in a first and / or second bearing section for bearings delimiting the drive zone. This also enables optimized dimensioning, essentially based on the requirements of the belt coupling, i.e., based on the drive zone. The invention is also based on the concept of keeping the design as slim as possible and creating an advantageous installation situation.The invention is also based on the finding that an optimal drive zone can be used as a design parameter, for example for the bearing sections, by assuming that, starting from an advantageous target diameter for the drive zone or starting from a minimum diameter of the drive zone, further dimensioning of the shaft can be standardized with reference to ratios (factors) relative to the drive zone or to the drive zone diameter; in this respect, the present invention also includes, in particular, the technical teaching of starting from the drive zone when designing the shaft and giving it the highest priority by using the findings to adapt other shaft sections depending on it; the available bearing technology allows this (e.g. advantageous load ratings even with comparatively small bearings).In other words, the shaft can be dimensioned as slim as possible starting from the drive zone diameter, in particular by scaling the two shaft ends or at least the sections adjacent to the drive zone as far down as possible (i.e., making them comparatively thin) without incurring excessive material processing effort. Advantageously, all other shaft sections are each smaller than the drive zone diameter by a shaft section-specific, predefined factor. In this respect, the phrase "according to at least one predefined factor" should also be understood to mean that a first shaft section can be dimensioned based on a first factor with respect to the drive zone diameter, and a further shaft section can be dimensioned based on a further (second) factor with respect to the drive zone diameter.Thus, the invention is also based on the technical teaching of designing the individual diameters of the shaft (particularly those in the area of ​​the bearings) essentially by reference to the drive zone diameter; this also enables a standardizable shaft design based at least essentially on the respective advantageous drive zone diameter.

[0013] The "drive zone diameter" here refers to the maximum diameter of a circumferential surface of the drive zone or the corresponding drive zone section (in the case of multiple belts) on which the belt interacts with the shaft as intended. Typically, the circumferential surface of the drive zone is not strictly cylindrical, but rather slightly crowned (serving the belt's centering function); therefore, the drive zone diameter is understood here to be the diameter that typically characterizes the largest diameter in the central area of ​​the drive zone or the corresponding drive zone section.

[0014] The "(absolute) drive zone width" is understood in particular to mean the contact surface or running surface usable by the (respective) belt acting around the shaft. In the event that the drive zone is divided into at least two or three drive zone sections, the (absolute) drive zone width is also understood to include a longitudinal section of the shaft, which is taken into account in the design of shoulders or (central) webs for guiding the respective belt; thus, the (absolute) drive zone width is then composed of the widths of the individual drive zone sections and the widths of the webs or shoulders provided for guiding the belts (or at least their design-specific minimum width, e.g. 10% of the width of the respective drive zone section, for example 5 mm per shoulder or web).With two drive zone sections, an (absolute) drive zone width results from the sum of the width of the two drive zone sections and the width of the central web and the width of the two limiting shoulders; with three drive zone sections, an (absolute) drive zone width results from the sum of the width of the three drive zone sections and twice the width of the corresponding central web and the width of the two laterally limiting shoulder(s). Even in the case that only one belt or only a single drive zone section is provided, these approximately 10% on both sides of the drive zone section may have to be taken into account, especially if two shoulders are provided for in the design. Since shoulders do not necessarily have to be designed as an integral part of the shaft, but rather, for example,can also be provided by additional pulleys, the present disclosure relates to both variants: if no integral shoulders are present, the corresponding width specification relates to the length section intended for the drive zone in the sense of the actually usable running surface for the belt(s) and a length section intended for pulleys or similar axial limiting means. In this respect, the term "drive zone width" is also to be understood as a design length specification for the length section of the shaft that must be planned accordingly for the correct functioning of the at least one belt, in particular between two bearing sections.

[0015] A "shoulder" is understood to mean a lateral boundary of the entire drive zone, which is preferably designed as an integral part of the shaft, a "(shaft) shoulder," or which can optionally be connected to the shaft as an additional disc (attachment component) (compare so-called flanged discs in standard belt drives). Unless expressly stated otherwise here, the shoulder is preferably designed as an integral part of the shaft, i.e., formed by machining the shaft material.

[0016] A "web" is understood to mean a raised portion for dividing the drive zone into individual drive zone sections, particularly for a coupling with multiple belts, each of which is intended to run on only one of the drive zone sections separated from one another by the web. Unless expressly stated otherwise, the respective web is also preferably designed as an integral piece on the shaft, a "(shaft) web."

[0017] The shoulders and webs described here can also fulfil the function, among other things, of providing a contact / stop / rolling surface for a belt hold-down unit.

[0018] The “(absolute) belt width” is understood to be the cumulative width of the belts used, i.e., for example, with three belts, three times the width of the individual belt (assuming that all belts are exactly the same width).

[0019] A "belt drive unit" is understood here in particular to mean a traction machine by means of which power can be transmitted from a / the motor to at least one traction means designed as a belt, wherein the belt drive unit is configured to receive, mount, and support a shaft interacting with the at least one traction means. Although the shaft can also be regarded as a component of the belt drive unit, according to one of the exemplary embodiments the belt drive unit is configured to receive different shafts (e.g. depending on the power level or depending on a predefined or desired number of belts), so that the belt drive unit can also be provided without a shaft. The belt drive unit comprises at least the housing that accommodates or at least holds the shaft and the motor or drive.

[0020] The term "drive train arrangement" is understood here to mean, in particular, the torque-transmitting components that interact with the at least one belt, in particular also key and / or at least one toothing (shaft-hub connections in general); depending on the design of the shaft and the bearings and the desired assembly sequence, the drive train arrangement can also include bearing components or the entire bearings. Depending on the definition, the drive train arrangement can also include the motor or drive of the belt drive unit. Personified terms, unless formulated in the neuter form here, can refer to all genders within the scope of this disclosure. Any English terms or abbreviations used herein are technical terms commonly used in the industry and are familiar to those skilled in the English language.

[0021] The ratio of the drive zone diameter to the shaft diameter in at least one bearing section is always less than or equal to (<=) 2.0, especially in both bearing sections of the bearings bordering the drive zone. This also facilitates material processing that is as inexpensive as possible; the corresponding bearing is designed to be comparatively small, in particular significantly smaller than one or more other bearings.

[0022] The ratio of the drive zone diameter to the shaft diameter is always greater than or equal to (>=) 1.05, especially in both bearing sections of the bearings bordering the drive zone. This also prevents oversizing.

[0023] The ratio of the drive zone diameter to the shaft diameter in at least one bearing section of the bearings bordering the drive zone is in the range of less than or equal to (<=) 2.0 to greater than or equal to (>=) 1.05, particularly in both bearing sections. This also provides advantageous size gradation when implementing bearings of different sizes (if desired).

[0024] For example, the size ratio described here (drive zone diameter to shaft diameter) is in the range of 1.8 in a first bearing section and in the range of 1.2 in a second bearing section (or vice versa), or more moderate in each case with less strong diameter variation of the bearing sections (e.g. 1.7 and 1.3).

[0025] It has been shown that starting with a ratio or factor of drive zone diameter to shaft diameter of more than 2.0 (i.e., a reciprocal of less than 0.5 for the ratio of shaft diameter to drive zone diameter), the material machining of the shaft becomes comparatively complex. It has also been shown that starting with a ratio or factor of drive zone diameter to shaft diameter of less than 1.05 (i.e., a reciprocal of greater than 0.95 for the ratio of shaft diameter to drive zone diameter), over-dimensioning would occur (excessively thick shaft). According to the present disclosure, the drive zone diameter is placed first in size ratio specifications, as this serves as a reference value. However, the size ratio specification can also be expressed inverted as a reciprocal or used as a specification.

[0026] According to the invention, the ratio of the drive zone diameter to the shaft diameter in a first bearing section accommodating a fixed bearing is in the range of 1.9 to 1.6, particularly with a maximum deviation of 10%. This also enables, for example, an advantageous bearing arrangement and fixation in conjunction with a brake unit.

[0027] According to the invention, the ratio of the drive zone diameter to the shaft diameter in a second bearing section accommodating a floating bearing is in the range of 1.1 to 1.4, particularly with a maximum deviation of 10%. This also enables, for example, an advantageous bearing arrangement in combination with a rotor mounted on the shaft in a rotationally fixed manner.

[0028] The present invention therefore also provides a design approach for optimizing size ratios, material usage, strength, and installation conditions. Dimensioning can be optimized, on the one hand, with regard to efficient utilization of the shaft material, and, on the other hand, with regard to an advantageous arrangement and dimensioning of the bearings, particularly with regard to the respective selected or desired drive zone diameter. Based on the present disclosure, the person skilled in the art can achieve a comparatively stiff shaft that can be supported or mounted in the belt drive unit in a comparatively robust manner, particularly with regard to the longest possible service life of the entire assembly.

[0029] In this case, the diameter of the loose bearing section is / remains preferably larger than the diameter of the fixed bearing section.

[0030] According to one embodiment, at least two drive zone sections are provided which together form the drive zone, in particular at least two drive zone sections with the same drive zone diameter, in particular at least two or at least three drive zone sections each delimited from one another by a web provided circumferentially on the shaft, in particular drive zone sections with the same width. This also enables scaling with regard to the number of belts that can be used. The drive zone sections preferably all have the same diameter (in the case of a spherical design of the drive zone, reference is made here to the largest diameter). According to one embodiment, the shaft is configured to interact with at least two or at least three belts which are guided on individual drive zone sections of the drive zone.This design, in combination with the other features described here, provides an advantageous design and mode of operation of the drive train.

[0031] According to one exemplary embodiment, the shaft has two bearing sections, with the drive zone being arranged between the bearing sections, in particular directly adjacent to a first bearing section intended for a first bearing (in particular a fixed bearing) and / or directly adjacent to a second bearing section intended for a second bearing (in particular a floating bearing). The diameter of the respective bearing section can be continued or adopted to the respective end of the shaft without any noticeable further diameter change (possibly with the exception of very small steps or shaft shoulders or radii).

[0032] According to one embodiment, the drive zone is / is bordered on both sides by bearing sections of the shaft. This also facilitates the advantageous integration of the support function into a housing (bearing force transmission).

[0033] According to one embodiment, the shaft has the largest diameter in the region of the drive zone (apart from any shoulders delimiting the drive zone and / or webs dividing the drive zone into several sections) and the second largest diameter in the region of a first or second bearing section. This not least favors an advantageous design with regard to an at least approximately central / central arrangement of the drive zone with respect to the entire length of the shaft.

[0034] According to one embodiment, at least two or at least three drive zone sections are provided, which together form the drive zone, wherein the drive zone sections are each delimited from one another by a (central) web provided circumferentially on the shaft, wherein the width of the (central) web is in the range of 3 to 15% of the width of the individual drive zone section, in particular at most at least approximately 10%. This also makes it possible to provide the largest / widest possible usable running surface on a comparatively short absolute width of the drive zone or length of the shaft section provided for it. According to one embodiment, the (absolute) width of the drive zone (or the axial length of the corresponding shaft section), including any

[0035] Lands and / or shoulders provided in drive zone sections are in the range of 28 to 42% of the absolute length of the shaft, particularly in the range of 30 to 35%. This also enables a comparatively short shaft length and thus a compact drive, while maximizing the available or effective drive zone.

[0036] For example, with a driving zone diameter of approximately 75mm or 80mm, an absolute driving zone width in the range of 105mm can result in an absolute wavelength in the range of 335mm (ratio approximately 31%), or an absolute driving zone width in the range of 160mm can result in an absolute wavelength in the range of 470mm (ratio approximately 34%). For example, with a driving zone diameter of approximately 100mm, an absolute driving zone width in the range of 230mm can result in an absolute wavelength in the range of 550mm (ratio approximately 42%).

[0037] The aforementioned object is also achieved by a shaft for a drive train arrangement described here, wherein the shaft diameter in both a first and a second bearing section for the bearings delimiting the drive zone (apart from shoulders) is larger than the shaft diameter in another section adjacent to the respective bearing section (apart from any shoulders delimiting the drive zone). This results in the aforementioned advantages, in particular with regard to comparatively simple measures on the shaft, which nevertheless provide advantages for the entire drive train in many respects. The (absolute) width of the drive zone is advantageously in the range of 30 to 45% of the absolute length of the shaft.

[0038] The shaft can have a shoulder in front of the respective bearing section, which limits the (absolute) drive zone width and is dimensioned such that the drive zone width usable for at least one belt is reduced by a maximum of 10%. The shoulders can, for example, define an axial stop for the respective bearing and optionally also assume the function of a certain structural axial length buffer, for example, to more easily respond to any desired variations in power levels and / or desired absolute drive zone width and / or bearing width.Last but not least, this axial length buffer provided by at least one of the shoulders also enables potential variation optimization options with regard to an optimal ratio of belt width to the width of the corresponding drive zone section (which is oversized in width to allow the belt freedom of movement in the longitudinal direction), particularly without having to adapt the type of shaft (and thus the housing) support. The optimization measures described here can therefore be implemented in such a way that design flexibility remains open.

[0039] The aforementioned object is also achieved by a belt drive unit of an elevator system, installed / installable in a drive train arrangement described here, wherein the belt drive unit is configured to couple at least one drive of the belt drive unit to at least one driven component of the elevator system by means of at least one belt. This results in the aforementioned advantages, particularly with regard to the most streamlined integration of the drive train components between the drive and the driven component of the elevator system.

[0040] The aforementioned object is also achieved by an elevator system with a drive train arrangement described here and at least one belt drive unit installed therein, which couples / connects at least one drive of the belt drive unit to at least one driven component of the elevator system by means of at least one belt. This allows the aforementioned advantages to be realized.

[0041] The aforementioned object is also achieved by using a diameter-optimized shaft for a drive train arrangement of an elevator installation, in particular in a drive train arrangement described here, for coupling at least one drive of a / the belt drive unit of the elevator installation by means of at least one belt to at least one component of the elevator installation to be driven, wherein the shaft is mounted in bearings on both sides of a / the drive zone, wherein the diameter of the drive zone is larger according to at least one predefined factor than the shaft diameter in both bearing sections adjacent to the drive zone (apart from any shoulders delimiting the drive zone), wherein the size ratio of drive zone diameter to shaft diameter in a first bearing section accommodating a fixed bearing is in the range from 1.9 to 1.6;wherein the size ratio of drive zone diameter to shaft diameter in a second bearing section accommodating a floating bearing is in the range of 1.1 to 1.4. This enables the aforementioned advantages to be achieved. Advantageously, the shaft can also be dimensioned in a length-optimized manner with regard to the (absolute) width of the drive zone, in particular by ensuring that the absolute length of the shaft is in the range of a factor of 2 to 4 of the (absolute) width of the drive zone. This dimensioning measure with regard to the length enables advantageous dimensioning of the shaft in a / the second spatial direction, particularly in connection with the diameter dependency described here (two-dimensionally applied dimensioning measures, each depending on the design of the drive zone).

[0042] Summary: When designing drive trains for elevator systems, a favorable compromise between required resources and achievable technical (performance) data is also desirable. Especially in drive trains with belt drives, the shaft interacting with at least one belt in a drive zone requires structural optimization in order to fully exploit improvement potential with regard to other components of the drive train. According to the invention, the shaft has at least one section adjacent to the drive zone, the diameter of which is dimensioned as a function of the drive zone diameter, wherein the drive zone diameter is advantageously larger than this section (or the shaft is dimensioned thinner, particularly in the bearing sections, by at least a factor of less than 1 as a function of the drive zone diameter).This allows a particularly advantageous compromise to be found based on a diameter dependency (and optionally also a length dependency), particularly with regard to an optimum regarding both material processing effort and the smallest possible dimensions (avoiding oversizing). Based on this, the respective drive train can also be easily designed for different applications in the sense of a standardizable design guideline. Optionally, the width of the drive zone (or the axial length of the corresponding shaft section) can also be specified as a function of the absolute shaft length (or vice versa), as a supplementary dimensioning measure, also with regard to the axial extension.

[0043] SHORT DESCRIPTION OF THE CHARACTERS

[0044] 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:

[0045] Figures 1, 2, 3 each show a perspective side view of a shaft configured for a drive train arrangement according to embodiments;

[0046] Figure 4 shows a sectional side view of a shaft configured for a drive train arrangement according to an embodiment;

[0047] Figure 5 shows a schematic representation of a drive train arrangement coupled to an elevator system according to embodiments;

[0048] Figures 6A and 6B each show a perspective side view of a belt drive unit with a shaft or drive train arrangement according to exemplary embodiments; 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, or aspects that are clearly visible / depictable in the respective figure, will be addressed individually in connection with the respective figure.

[0050] A drive train arrangement 10 is provided for a belt drive unit (traction machine) 20, in particular for driving an elevator car 1 of an elevator system 100, wherein a drive 23 is coupled to at least one belt 21 via a shaft 13. The shaft 13 is mounted in a first bearing 11 (in particular a fixed bearing) and a second bearing 12 (in particular a floating bearing) in a first bearing section 13.1 and a second bearing section 13.2 in a housing 19, wherein the at least one belt 21 is guided in a drive zone 13.4, which optionally comprises a plurality of sections 13.5, each delimited by at least one shoulder 13.3 or by a web 13.3a. At one of the shaft ends, a toothed section 13.6 can be provided, in particular for a rotationally fixed arrangement of a component of a brake unit 17, and at the other shaft end, a key section 13.7 or a comparable rotationally fixed coupling to the rotor of the drive 23 can be provided.

[0051] The following reference numbers indicate in detail individual size or position specifications, with reference to the radial direction (r) and to the longitudinal direction x (axial direction);

[0052] B13 Width or longitudinal section (absolute) between bearing seats / bearing surfaces; bl 3.3 Width of an individual shoulder; bl3.3a Width of the individual central web; B13.4 Absolute drive zone width comprising all drive zone sections and also the webs / shoulders provided for delimitation; b 13.5 Width of the individual drive zone section (with average proportion of web / shoulder); b21 Width of the individual belt, B21 Absolute belt width of all belts used; Shaft diameter D0 at the first end of the shaft (particularly in the toothed section); Shaft diameter D1 in the first bearing section, particularly immediately adjacent to the drive zone, apart from a shoulder; (first) shoulder diameter D2 (or shaft diameter in the area of ​​a first shoulder); Drive zone diameter D3 (or shaft diameter in the area of ​​the drive zone); (central) web diameter D4 (or shaft diameter in the area of ​​a web); (second) shoulder diameter D5 (orShaft diameter in the area of ​​a second shoulder);.

[0053] Shaft diameter D6 in the second bearing section, particularly immediately adjacent to the drive zone, apart from a shoulder; shaft diameter D7 at the second shaft end (particularly in the keyway section, rotor coupling section); the absolute length of the shaft is designated here as L13.

[0054] It is worth mentioning that, according to the present disclosure, the respective (shaft) shoulder 13.3 is configured as a one-sided delimiting shoulder for limiting the belt movement (axial degree of freedom of movement), and that one / the (shaft) web 13.3a is configured as a central web, thus acting as a delimiting shoulder on both sides and thus also providing an axial stop for two belts each (the terminological distinction chosen here is to be understood in this respect). Optionally, an axial limitation of the key section can also be provided, in particular by a shaft shoulder shoulder, which, however, may be significantly flatter than the shoulders described here for limiting the drive zone.

[0055] Guides, panels or similar baffles 19.9 may be provided on the housing for the clean coupling / discoupling of the belt(s).

[0056] In the following, special features of the invention are explained with reference to individual figures or embodiments.

[0057] Fig. 1 shows a first type of shaft having the features according to the invention (belt not shown); the drive zone 13.4 has two drive zone sections 13.5, which are separated from each other by a web 13.3a. The drive zone diameter is, according to an advantageous factor, larger than the shaft diameter on both sides of the drive zone. Preferably, the drive zone is, according to an advantageous factor, smaller than the absolute shaft length.

[0058] Fig. 2 shows a second type of shaft having the features according to the invention (belt not shown); the drive zone 13.4 has three drive zone sections 13.5.

[0059] Fig. 3 shows a third type of shaft having the features according to the invention (belt not shown); the drive zone 13.4 has three drive zone sections 13.5. This type differs slightly from the type shown in Fig. 2 with regard to the design of the shoulder 13.3 and the bearing section 13.2 between the key section 13.7 and the drive zone 13.4.

[0060] Fig. 4 shows a shaft having the features according to the invention with belts 21 in the drive zone, with the individual size and position specifications explained in detail. The design parameter according to the invention (reference value drive zone diameter D3 as a specification for at least one shaft diameter D0, D1, D6, D7) is underlined here. Fig. 4 also highlights that the absolute belt width B21 with two belts used (as provided here) corresponds to twice the individual belt width b21, assuming that the belts used are of the same width (B21 = 2xb21).

[0061] Fig. 5 illustrates a rough schematic of the interaction between elevator car 1 and drive train assembly 10. The shaft described here is installed in drive train assembly 10. The positional relationship of the components shown is intentionally not specified here; in this regard, the person skilled in the art can provide an application-specific implementation.

[0062] Fig. 6A shows the belt drive unit 20 from the motor 23 side; Fig. 6B shows the opposite side, which is intended for the arrangement of the brake unit 17. It can be seen from Fig. 6 that the drive zone is arranged largely centrally and the entire belt drive unit 20 is comparatively compact.

[0063] List of reference symbols

[0064] I Elevator car

[0065] 10 Drivetrain arrangement

[0066] II first bearing, especially fixed bearing

[0067] 12 second bearing, especially loose bearing

[0068] 13 Wave

[0069] 13.1 first camp section

[0070] 13.2 second camp section

[0071] 13.3 (Wave) shoulder, especially one-sided

[0072] 13.3a (Wave) web in the form of a central web, bordering on both sides

[0073] 13.4 Drifting zone, possibly comprising several sections

[0074] 13.5 individual drift zone section, delimited by a bridge or shoulder

[0075] 13.6 Gear section especially for brake unit

[0076] 13.7 Key section (rotationally fixed connection to the rotor)

[0077] 17 Brake unit

[0078] 19 housings

[0079] 19.9 Guide, aperture, baffle

[0080] 20 Belt drive unit (traction machine)

[0081] 21 belts

[0082] 23 Engine, drive

[0083] 100 elevator system

[0084] B13 Width or length section (absolute) between bearing seats / bearing surfaces b 13.3 Width of a shoulder b 13.3a Width of the individual central web

[0085] Bl 3.4 (absolute) drive zone width b 13.5 Width of the individual drive zone section b21 Width of the individual belt

[0086] B21 (absolute) belt width

[0087] DO Shaft diameter at the first end (especially gear section)

[0088] D 1 Shaft diameter in the first bearing section

[0089] D2 (first) shoulder diameter (shaft diameter in the area of ​​a first shoulder)

[0090] D3 Driving zone diameter (shaft diameter in the driving zone area)

[0091] D4 (central) web diameter (shaft diameter in the area of ​​a web)

[0092] D5 (second) shoulder diameter (shaft diameter in the area of ​​a second shoulder) D6 Shaft diameter in the second bearing section

[0093] D7 Shaft diameter at the second end (especially keyway section, rotor coupling)

[0094] L13 absolute length of the shaft r radial direction x longitudinal direction (axial direction)

Claims

Patent claims 1. Drive train arrangement (10) for a belt drive unit (20) of an elevator installation (100), comprising a shaft (13) mounted in a housing, on which shaft a drive zone (13.4) is configured for at least one belt cooperating with a / the belt drive unit (20), wherein the drive zone (13.4) has a drive zone diameter (D3), wherein the shaft (13) has at least one section whose diameter is dimensioned as a function of the drive zone diameter (D3); characterized in that the drive zone diameter (D3) is larger than the shaft diameter (D1, D6) in a first and second bearing section for the drive zone (13) according to at least one predefined factor.4) limiting bearings (11, 12), in particular also larger than a / the shaft diameter (D0, D7) at the respective shaft end, wherein the size ratio of drive zone diameter (D3) to shaft diameter (D1) in a first bearing section accommodating a fixed bearing (11) is in the range from 1.9 to 1.6; wherein the size ratio of drive zone diameter (D3) to shaft diameter (D6) in a second bearing section accommodating a floating bearing (12) is in the range from 1.1 to 1.

4.

2. Drive train arrangement (10) according to the preceding claim, wherein at least two drive zone sections (13.5) are provided, which together form the drive zone (13.4), in particular at least two drive zone sections with the same drive zone diameter (D3), in particular at least two or at least three drive zone sections each delimited from one another by a web (13.3a) provided circumferentially on the shaft (13), in particular drive zone sections with the same width.

3. Drive train arrangement (10) according to one of the preceding claims, wherein the shaft (13) is arranged to interact with at least two or at least three belts which are guided on individual drive zone sections of the drive zone (13.4).

4. Drive train arrangement (10) according to one of the preceding claims, wherein the shaft (13) has two bearing sections, wherein the drive zone (13.4) is arranged between the bearing sections, in particular directly adjacent to a / the first bearing section provided for a first bearing and / or directly adjacent to a / the second bearing section provided for a second bearing.

5. Drive train arrangement (10) according to one of the preceding claims, wherein the drive zone (13.4) is / is delimited on both sides by bearing sections of the shaft (13).

6. Drive train arrangement (10) according to one of the preceding claims, wherein the shaft (13) has the largest diameter in the region of the drive zone (13.4) and the second largest diameter in the region of a first or second bearing section.

7. Drive train arrangement (10) according to one of the preceding claims, wherein at least two or at least three drive zone sections (13.5) are provided, which together form the drive zone (13.4), wherein the drive zone sections (13.5) are each delimited from one another by a web (13.3a) provided circumferentially on the shaft (13), wherein the width of the web (13.3a) is in the range of 3 to 15% of the width of the individual drive zone section (13.5), in particular 10%.

8. Drive train arrangement (10) according to one of the preceding claims, wherein the width of the drive zone (13.4) is in the range of 28 to 42% of the absolute length of the shaft (13), in particular in the range of 30 to 35%.

9. Shaft (13) for a drive train arrangement (10) according to one of the preceding claims, wherein the shaft diameter in both a first and a second bearing section for the bearings (11, 12) delimiting the drive zone (13.4) is larger than the shaft diameter in a further section of the shaft adjacent to the respective bearing section.

10. Belt drive unit (20) of an elevator installation (100), installed / installable in a drive train arrangement (10) according to one of claims 1 to 8, wherein the belt drive unit (20) is designed to couple at least one drive (23) of the belt drive unit (20) by means of at least one belt (21) to at least one component of the elevator installation (100) to be driven.

11. Elevator installation (100) with a drive train arrangement (10) according to one of claims 1 to 8 and at least one belt drive unit (20) installed therein, which couples / couples at least one drive (23) of the belt drive unit (20) by means of at least one belt (21) to at least one component of the elevator installation (100) to be driven.

12. Use of a diameter-optimized shaft (13) for a drive train arrangement (10) of an elevator installation (100), in particular in a drive train arrangement (10) according to one of claims 1 to 8, for coupling at least one drive (23) of a / the belt drive unit (20) of the elevator installation (100) by means of at least one belt (21) to at least one component of the elevator installation (100) to be driven, wherein the shaft (13) is mounted on both sides of a / the drive zone (13.4) in bearings (11, 12), wherein the diameter of the drive zone (13.4) is larger according to at least one predefined factor than the shaft diameter in both sides adjacent to the drive zone (13.4) adjacent bearing sections, wherein the size ratio of drive zone diameter (D3) to shaft diameter in a first bearing section accommodating a fixed bearing is in the range from 1.9 to 1.6; wherein the size ratio of drive zone diameter (D3) to shaft diameter in a second bearing section accommodating a floating bearing is in the range from 1.1 to 1.4.

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