Drivetrain arrangement for a drive unit of an elevator system and corresponding shaft and use thereof

Abstract

The present invention provides an improved drivetrain arrangement in particular for a drive unit of an elevator system, in which the drive unit comprises at least one belt drive, with a shaft mounted in a housing in a fixed bearing and in a movable bearing; the fixed bearing can be / become secured in an axially fixed manner on the shaft without a bearing cover in several circumferential positions in each case by means of at least one disc interacting with the housing. Advantageously, a reservoir is configured between the bearings and a brake unit to receive bearing grease. Advantageously, a / the inner diameter of the fixed bearing is smaller than or greater than a / the inner diameter of the movable bearing such that in the axial assembly direction, the bearing with the larger inner diameter can be brought over the shaft portion intended for the bearing with the smaller inner diameter. This simplifies the assembly and implementation of the drive in particular in connection with at least one driving zone provided on the shaft between the bearings and optimises the operation of the drive.

Description

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

[0002] TECHNICAL FIELD

[0003] The present invention relates to a drive train arrangement for a drive unit (in particular a belt drive unit) of an elevator system, comprising a shaft mounted in a housing in at least two bearings, in particular in a fixed bearing and a floating bearing; wherein at least one component of at least one of the bearings can advantageously be secured to the shaft without a bearing cover. The present invention further relates to a further development of such a drive train arrangement in that the functioning of a brake unit can be improved by a reservoir containing bearing grease or similar lubricant.The present invention further relates to a further development of such a drive train arrangement in that the inner diameters of the bearings are / are dimensioned interdependently such that, in the axial assembly direction, the bearing with the larger inner diameter can be mounted over the shaft section provided for the bearing with the smaller inner diameter. In this respect, the present invention relates to an optimization of the arrangement and functional integration and support / bearing of the shaft in the drive train. Furthermore, the present invention also relates to the use of a correspondingly designed shaft, in particular in a drive train of an elevator system. In particular, the invention relates to a device according to the preamble of the respective independent claim.

[0004] BACKGROUND OF THE INVENTION

[0005] When it comes to 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, generally referred to here as belt drive or belt drive. 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 bearing 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 adapt the drive zone for different power levels orto design different, scalable drive trains in such a way 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.

[0006] According to the state of the art, the shaft is provided in a more or less standardized configuration for functional integration and support within the drive train. Based on this, there is interest in an improved way of designing and integrating the shaft into the drive train, i.e., in a technical theory that enables the optimization of the design of the shaft and its interacting components, particularly in the drive zone and in relation to the shaft support.

[0007] The following publications describe shafts with axial locking devices acting on the shaft: DE 10 2021 003 240 Al, US 4 482 194 A.

[0008] 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 bearings and functional integration of the shaft within the drive train. Last but not least, there is also interest in a scalable, applicable technical theory for the (design) optimization of the drive train sections that interact with the shaft, particularly with regard to potential savings in the resources used for construction.

[0009] SUMMARY OF THE INVENTION

[0010] The objective is to provide a drive train arrangement for a drive unit of an elevator system, in which an advantageous design and layout of the bearings, shaft, and housing accommodating the shaft enables a beneficial symbiosis of the requirements with regard to assembly, bearing support, lubrication, and also an optional active braking function on the shaft, particularly in connection with the optimization of drive units comprising at least one belt drive. It is also the objective to design the drive train arrangement in such a way that the shaft can be easily optimized not only with regard to bearing support and assembly, but also with regard to operating conditions and operating parameters, in particular with regard to bearing lubrication and any desired braking function.Last but not least, it is also an object to design the shaft of such a drive train arrangement in such a way that, with the simplest possible assembly of the shaft during subsequent (long-term) operation with regard to optimized bearing function, lubrication can be ensured with high reliability, independently of or in combination with a braking function. This object is achieved by a drive train arrangement according to claim 1 or according to the independent device claims, as well as 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 stated otherwise.The present invention is based on several aspects, which can (but do not have to) be implemented in combination with one another; all of these aspects contribute to achieving the object of the present invention at least to the extent that the functioning of the shaft in the drive train can be improved while ensuring the leanest possible design of the individual components of the drive train, in particular by proposing uniform measures regarding the bearings of the shaft and associated components.

[0011] A drive train arrangement is provided for a drive unit / belt drive unit of an elevator installation, with a shaft mounted in a housing in at least two bearings, in particular in a fixed bearing and a loose bearing;

[0012] According to the invention, at least one component (in particular a bearing ring) of at least one of the bearings, in particular the fixed bearing or the corresponding component of the fixed bearing, is secured axially fixedly on the shaft in several circumferential positions, each by means of at least one disk interacting with the housing, without a bearing cover. This eliminates the need for a bearing cover and enables a comparatively slim design.

[0013] The invention is also based on the concept of utilizing the housing as extensively as possible to position and secure the individual components relative to one another, ideally without requiring complex additional components in addition to the housing. In other words, the present invention teaches the use of standard, cost-neutral (imperceptible) assembly aids such as shims instead of a specific bearing cap, thus avoiding the comparatively complex production of bearing caps.

[0014] The washers described here, e.g. in the form of washers (or their corresponding arrangement), can particularly advantageously fix the fixed bearing in the housing in a classic fixed / loose bearing arrangement. Traditionally, the fixed bearing is fixed by means of a bearing cover; in many applications, this bearing cover is provided either as a solid turned part or as a circular sheet metal, and therefore represents a component that must be provided separately. In contrast to this, the present invention enables the bearing in question to be secured solely by means of the washers that are readily available and do not require any individual design, which, for example, rest or are brought into contact with the outer ring of the bearing on the one hand and the housing on the other. For example, the washers are axially secured by being fixed or screwed to the end face of the housing from the outside using screws.be preloaded, whereby these screws can also be secured against accidental loosening using common methods (e.g. using adhesive, lock washers or similar means with an equivalent effect). The bearing seat can also be designed in such a way that the bearing protrudes minimally and the respective disc can fix the bearing in place through a certain assembly preload force; in this respect, preload and secure axially tight seating can also be ensured by / the residual stress (elasticity or material thickness) of the discs. Sealing of the drive train or the housing is not the function of the discs here; rather, already sealed bearings can advantageously be used. In this respect, the discs essentially provide an axial locking Z-preload (fixing of the bearing in question).It has been shown that the fixing concept according to the invention can preferably also be implemented in all those installation situations for the bearings described here in which sealed bearings are provided or can potentially be used, and even when sealing of the bearings is not required at all.

[0015] An assembly method is known from the prior art in which a bearing cap is / is not yet mounted, but is mounted after installation of the bearing in interaction with the bearing inner ring and by means of a screw connection to the shaft, transmitting axial force and covering the end face. In contrast, the arrangement according to the invention no longer requires a bearing cap, but can ensure securing of the corresponding bearing component by means of washers that can be attached directly to the housing, e.g., by screwing three washers acting on an outer ring of the bearing to the housing. In other words: the corresponding end face of the shaft can remain open.

[0016] The present invention can advantageously be implemented in drive units configured as belt drive units. As described here, an "(absolute) drive zone width" is to be understood in particular as 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 structurally taken into account for 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 structurally intended 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, the (absolute) drive zone width is therefore the sum of the width of the two drive zone sections, the width of the center web, and the width of the two limiting shoulders. Therefore, 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 for the correct functioning of at least one belt, particularly between two bearing sections.

[0017] The term "drivetrain arrangement" refers here in particular to the torque-transmitting components that interact with a motor and in particular with at least one belt of a belt drive unit, in particular also with a 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 drivetrain arrangement can also include bearing components or the entire bearings. Depending on the definition, the drivetrain arrangement can also include the motor or drive of the belt drive unit.

[0018] 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.

[0019] 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."

[0020] 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.

[0021] The “(absolute) belt width” is to be understood as the cumulative width of the belts used, i.e., in the case of three belts, three times the width of the individual belt (assuming that all belts are exactly the same width). The “belt drive unit” is to be understood here in particular as a traction machine by means of which power can be transmitted from a / the motor to at least one traction device designed as a belt, wherein the belt drive unit is designed to receive, mount and support a shaft that interacts with the at least one traction device. 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 designed 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.

[0022] 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.

[0023] Unless formulated in the neuter, personified terms can refer to all genders within the scope of this disclosure. Any English-language expressions or abbreviations used herein are standard industry terms and are familiar to those skilled in the English language.

[0024] According to one embodiment, the at least one component (in particular a bearing ring) of the at least one bearing, in particular the fixed bearing or a bearing ring of the fixed bearing, is secured in the multiple circumferential positions by fixing the at least one disk to the housing, in particular with the disk in a radially overlapping arrangement between the housing and the outer ring of the respective bearing. This promotes simple assembly and good accessibility and enables the arrangement of the fastening means in an advantageous (non-interfering) area of ​​the housing.

[0025] According to one embodiment, the at least one washer in each of the multiple circumferential positions comes into contact with an outer ring of the respective bearing (in particular the fixed bearing). This also enables the direct application and transmission of an axial locking force from the fastening means (in particular screws) to the bearing.

[0026] According to one embodiment, the discs are evenly distributed symmetrically around the circumference, in particular in at least three circumferential positions. This also promotes the most uniform force distribution possible and thus also the most precise arrangement of the corresponding bearing.

[0027] According to one embodiment, the at least one disk provided in the respective circumferential position is fixed by means of a screw or a similarly acting fastening means, in particular with the respective screw in an axial alignment at least approximately parallel to the shaft and on the outside of the housing. Such an arrangement not only promotes an advantageous force flow path but also provides good accessibility.

[0028] According to one embodiment, at least three bores or similar recesses, preferably evenly distributed around the circumference, are formed in a front section of the housing in which the bearing in question is mounted (in particular the fixed bearing), for receiving fastening means or screws that secure the discs. This also allows the respective fastening position to be unambiguously predefined or visibly specified for an installer.

[0029] According to one embodiment, the shaft terminates in a front section of the housing in which the bearing in question (in particular the fixed bearing) is mounted, with a front end (at least approximately flush in / in the same radial plane) and, together with the bearing in question, seals the corresponding housing passage. This also provides an elegant housing closure with the slimmest possible design.

[0030] Advantageously, a / the drive train arrangement is provided, in particular for a drive unit / belt drive unit of an elevator installation, in a design with a shaft mounted in a housing in at least two bearings, in particular in a fixed bearing and a loose bearing, and with a brake unit acting on the shaft; wherein the drive train arrangement has a reservoir arranged between the bearings and the brake unit, designed to hold bearing grease, wherein the reservoir is arranged and designed (in particular integrally on the housing) in such a way that bearing grease is driven by centrifugal force from / by an adjacent bearing or from the at least two bearings into the reservoir; in particular a drive train arrangement comprising the features of a drive train arrangement described here. In this respect, it is also proposed within the scope of the present invention to take precautions on the housing to ensure not only the most precise bearing seat orNot only can the correct bearing position be ensured with a high degree of reliability, but long-term functionality can also be ensured with minimal maintenance effort, particularly through at least partially self-maintaining / self-regulating functionality. This further optimizes the entire drive train arrangement in such a way that the bearings can be optimized both in terms of design and operation through comparatively simple yet synergistic measures.

[0031] The brake unit (or at least one brake disc) is connected to the shaft in a toothed section at a shaft end next to one of the bearings in a rotationally fixed manner and can interact with an end face of the housing, for example.

[0032] The invention is also based on the concept of requiring as little further processing of the shaft as possible and integrating at least part of the intended range of functions into the housing. In other words, the invention provides for interaction between the housing and the shaft not only with regard to the type and manner of bearings, but also with regard to individual operating functions, at least including lubrication, particularly at an axial position of the shaft upstream of a brake unit.

[0033] Draining the leaking grease is not necessary; rather, the reservoir can be dimensioned such that the grease contained in the bearing (or the maximum possible amount that can escape) can (and could) be completely absorbed in the reservoir, and in particular cannot (and could not) reach a brake unit. The grease / oil is driven radially outwards by centrifugal force and collects at the bottom of the reservoir by gravity, allowing it to flow along the surface of the reservoir. From this lowest point in relation to the direction of gravity, further use of this lubricating medium can be provided (optional).

[0034] The grease reservoir has, for example, a circular segment-shaped, particularly semicircular, cross-sectional geometry in the radially outer region (particularly in a ring-like configuration). The relative position relative to / to a brake unit can be selected in such a way as to prevent grease / oil from reaching a brake disc or interacting sections. The grease reservoir can be provided at all existing bearing points; the most effective arrangement is between the brake-side bearing point and the brake. Therefore, it is sufficient if the grease reservoir is provided on only one axial side.

[0035] The present invention also enables the most cost-effective, material-efficient and sustainable bearing and the lubrication required for this, whereby a comparatively safe functioning of a brake unit can also be ensured (in particular without the need for further measures).

[0036] According to one embodiment, the reservoir is provided integrally on the housing, in particular, formed / configured exclusively by the housing. This promotes functional decoupling from the shaft and can further streamline the shaft design.

[0037] According to one embodiment, the reservoir is designed as a ring with a circular or elliptical segment-shaped cross-sectional geometry and is arranged with a radial extension extending radially outward at least beyond the adjacent bearing in such a way that bearing grease escaping from at least one bearing is driven radially outward into the reservoir upon rotation of the shaft (i.e., under corresponding centrifugal forces). This can also ensure a good collection and retention function.

[0038] According to one embodiment, the reservoir is arranged on a housing face intended for the placement of a brake disc, in the first axial section adjacent to the housing face. This promotes the smooth interaction of lubrication measures and braking function.

[0039] According to one embodiment, the reservoir (when the bearing / shaft is installed as intended) is arranged axially directly next to one of the bearings and axially directly next to the brake unit, between the bearing and the brake unit. This relative position proves to be particularly effective.

[0040] According to one embodiment, the lowest point of the reservoir is located at least 5%, preferably at least 10%, further radially outward than the radius of the outer ring of at least the adjacent bearing. This promotes the self-regulating effect described here with regard to lubricant removal, in particular to prevent contamination of the brake unit. According to one embodiment, at least one drive zone for at least one belt of the drive unit is configured on the shaft, wherein the at least one drive zone is arranged between the bearings. The reservoir can also ensure protection of the belt from lubricant.

[0041] According to one exemplary embodiment, the reservoir (with the bearing / shaft in the intended installation position) is arranged between the fixed bearing and the brake unit (apart from an axial ring or similar bearing seat shoulder), in particular axially directly adjacent to the fixed bearing and axially directly adjacent to the brake unit. This also promotes particularly effective lubricant absorption.

[0042] According to one embodiment, a felt ring or similar lubricant collecting element is arranged between the reservoir and a bearing inner ring, particularly filling the axial section therebetween. This can also further increase the effectiveness of the reservoir arrangement.

[0043] Advantageously, a / the drive train arrangement is provided in particular for a drive unit of an elevator installation comprising at least one belt drive with a shaft mounted in a housing in at least two bearings, in particular in a fixed bearing and a loose bearing, wherein at least one drive zone for at least one belt of the drive unit is configured on the shaft between the bearings; wherein an inner diameter of the fixed bearing is smaller or larger than an inner diameter of the loose bearing and deviates from the inner diameter of the other bearing in such a way that, in the axial mounting direction, the bearing with the larger inner diameter can be applied (slidably, mounted), in particular without contact, over the shaft section provided for the bearing with the smaller inner diameter; in particular a drive train arrangement comprising the features of a drive train arrangement described here.The outer diameters of the bearings can also differ from one another in such a way that assembly of the shaft in the housing with bearings pre-assembled on the shaft is simplified, in particular at least approximately analogously based on the diameter variation described here using the example of the inner diameter. Apart from this, the size of the respective bearing can also be varied such that one inner diameter deviates more or less from the inner diameter of the other bearing than is / will be realized for the outer diameters (e.g. based on bearing rings or balls or rolling elements of different thicknesses). In this way, an optimum can be found specifically for the respective interface (on the one hand to the shaft, on the other hand to the housing). The specialist can consider these possible variations and implement them for the specific application.In this respect, the present invention also proposes measures regarding the dimensioning of the bearing seats in order to further optimize the bearing arrangement and, in particular, to facilitate assembly. The present invention therefore teaches the possibility of different dimensioning in both bearing sections, even with comparatively symmetrical bearing loads, in particular to ensure that the shaft requires minimal machining and is not oversized with respect to the load rating of the corresponding bearing.

[0044] The invention is also based on the concept of implementing bearings of different sizes with a size variation only to the extent that a predominantly evenly distributed load, as expected, does not lead to oversizing, while still ensuring the assembly advantages achievable with the different bearing sizes. In other words, the two bearing sizes, although different, are nevertheless brought as close to each other as possible (i.e., in a sense, standardized).

[0045] In conventional electric motors, the axle load at the (two) bearing points can vary comparatively greatly; in particular, in conventional electric motors, the axle load on the output side is usually much higher than on the opposite side. Especially in the case of a drive for an elevator system (elevator installations), the axle load is generally assumed to be very high, but largely evenly distributed (at least in the case of belt drives); up to now, a symmetrical structure of the shaft relative to the drive zones has been implemented, which results in comparable loads at the corresponding bearing points. The invention makes it possible, specifically in this context, to find an optimum for implementing bearings that are as similar as possible in terms of size and load rating, but nevertheless different. The corresponding bearing diameter can also be selected orIt can be specified that the shaft requires as little (re)machining as possible and that it does not need to be oversized in terms of load capacity. This also provides cost advantages. A bearing arrangement without a bearing cap is also possible (regardless of the individually selected / optimized bearing diameter).

[0046] According to one exemplary embodiment, the inner diameters of the bearings differ from one another (only) to such an extent that remachining of the shaft is minimized / can be minimized. This design approach helps to take into account that a significant diameter variation is associated with disadvantageously high material processing expenditure. According to one exemplary embodiment, the inner diameters of the bearings differ from one another to such an extent that, in the axial assembly direction, the bearing with the larger inner diameter can be applied (slidably mounted) over a shaft section configured as at least one drive zone, in particular when at least two or three drive zones are predetermined by the shape of the shaft. This also promotes very advantageous assembly.

[0047] According to one embodiment, the inner diameter of the fixed bearing is smaller than the inner diameter of the floating bearing. This configuration or size distribution proves to be advantageous, particularly with regard to the belt drive units described here.

[0048] According to one embodiment, the smaller bearing is arranged between the drive zone and a brake unit acting around the shaft. This also facilitates a favorable installation situation.

[0049] The drive unit described here is preferably designed as a belt drive unit with at least one belt engaging at least one drive zone of the shaft, preferably with at least two or three drive zones and a corresponding number of belts.

[0050] The above-mentioned object is also achieved by an elevator system with at least one drive unit described here.

[0051] The aspects of the invention described herein can be implemented individually or in combination with one another. In this respect, the aforementioned object is also achieved by using a shaft that can be mounted in a housing in at least two bearings, in particular in a fixed bearing and a floating bearing, for coupling drive components of a drive train arrangement of an elevator installation, in particular for coupling at least one belt of a drive unit / belt drive unit with at least one component of the elevator installation to be driven, wherein at least one component of at least one of the bearings, in particular of the fixed bearing, is secured axially fixedly on the shaft in several circumferential positions, each by means of at least one disk interacting with the housing, without a bearing cover.wherein the shaft has at least one of the following features, particularly in combination with one another: the housing has a reservoir arranged (when the bearings / shaft are installed as intended) between the bearings and a gear section of the shaft provided for a brake unit, designed to hold bearing grease, and / or wherein an inner diameter of the fixed bearing is smaller or larger than an inner diameter of the floating bearing; in particular, use of the shaft in a drive train arrangement described here. This allows the aforementioned advantages to be realized, particularly with regard to an approach that takes into account both the installation situation and the (long-term) operation of the drive unit.

[0052] The aforementioned object is therefore also achieved by a drive train arrangement described here, manufactured by dimensioning and arranging the shaft and housing such that the disks securing the corresponding bearing axially rest against the housing at the end face, and by forming a reservoir for the bearing grease by removing material at least on the housing (and optionally also in a corresponding axial section on the shaft), and optionally also by machining a shaft section intended for the bearing with the smaller inner diameter. This allows the aforementioned advantages to be realized, particularly with regard to optimizing the design of the shaft bearing.

[0053] Summary: The present invention provides an improved drive train arrangement, in particular for a drive unit of an elevator installation, in which the drive unit comprises at least one belt drive, with a shaft mounted in a housing in a fixed bearing and a floating bearing. The fixed bearing can be secured axially fixed to the shaft in several circumferential positions, each by means of at least one disk interacting with the housing, without a bearing cover. Advantageously, a reservoir is arranged between the bearings and a brake unit of the drive train arrangement to hold bearing grease. Advantageously, an inner diameter of the fixed bearing is smaller or larger than an inner diameter of the floating bearing such that, in the axial mounting direction, the bearing with the larger inner diameter can be mounted over the shaft section provided for the bearing with the smaller inner diameter.This facilitates the assembly and implementation of the drive, particularly in conjunction with at least one drive zone provided on the shaft between the bearings, and optimizes the drive's operation. The features and aspects described here can also be advantageously combined with one another, with each aspect providing the advantages described here in its own right.

[0054] SHORT DESCRIPTION OF THE CHARACTERS

[0055] 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. Figures 1, 2, and 3 each show a perspective side view of a shaft configured for a drive train arrangement according to exemplary embodiments.

[0056] Figure 4 shows a sectional side view of a shaft configured for a drive train arrangement according to an embodiment;

[0057] Figure 5 shows a schematic representation of a drive train arrangement coupled to an elevator system according to embodiments;

[0058] Figures 6A, 6B each show a perspective side view of a belt drive unit with a shaft or drive train arrangement according to embodiments;

[0059] Figure 7 shows a perspective view of a belt drive unit configured for a drive train arrangement according to embodiments, in particular for elevator systems;

[0060] Figures 8A, 8B each show a side view of a shaft of a drive train arrangement mounted in a housing according to embodiments;

[0061] Figure 9 shows a schematic representation in a partially sectioned view of a shaft configured for a drive train arrangement according to embodiments;

[0062] DETAILED DESCRIPTION OF THE FIGURES

[0063] 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.

[0064] 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.

[0065] The following reference numbers designate individual size or position specifications in detail, whereby reference is made to the radial direction (r) and the longitudinal direction x (axial direction); B13 Width or length 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 DO at the first end of the shaft (in particular in the toothed section); Shaft diameter D1 in the first bearing section, in particular 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 (orShaft 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 (or shaft diameter in the area of ​​a second shoulder);.

[0066] 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.

[0067] 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 (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 13.8 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.

[0068] The housing may be provided with guides, baffles or similar guide plates 19.9 for the clean coupling / discoupling of the belt(s).

[0069] In the following, special features of the invention are explained with reference to individual figures or embodiments.

[0070] 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. 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.

[0071] 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.

[0072] 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. It is emphasized in Fig. 4 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).

[0073] 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.

[0074] 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.

[0075] In Fig. 7 it can be seen that the bearing or its bearing ring 11.1 can advantageously be held by three disks 16, which can be clamped between the housing and the bearing ring by means of screws 18 secured in the axial direction on the housing 19. Corresponding (threaded) bores 19.1 are formed on the housing in a contact section provided for the disks, in particular concentrically around a / the housing passage 19.3 for the shaft 13. A / the braking surface section 19.2 provided for interaction with the braking unit (not shown) can also be formed on the same end face. In this respect, the fastening means 18 can also be arranged countersunk below this braking plane 19.2; the housing provides the corresponding recesses for this purpose. Details regarding an advantageous relative arrangement of the reservoir 15 are shown in Fig. 8A, 8B.Fig. 8A shows an advantageous embodiment of the reservoir 15 by integral formation in the housing 19, in particular directly axially next to a shoulder for the outer ring of the respective bearing 11. Fig. 8B shows the area indicated by the dashed circle in Fig. 8A in detail. The reservoir 15 is arranged directly next to the brake unit 17, axially borders the brake unit and any brake disc that interacts with the housing, thus protecting them particularly effectively from lubricating medium (oil / grease) escaping from the bearings. The contour C15 or the cross-sectional geometry of the reservoir 15 is advantageously semicircular in this example (at least approximately), whereby a groove or an additional recess can also be provided at a lowest point RI5, in the sense of a predefined collection point for the lubricating medium.

[0076] Fig. 8B also shows in detail a felt ring 14 or similar collecting / receiving element, which is arranged between the reservoir 15 and the bearing inner ring 11.2, in particular filling the axial section therebetween. In this way, the functioning of the reservoir 15 can be specified even more precisely: the oil / lubricating medium is held back in the axial direction in the area of ​​the shaft and must therefore take the axial path via the reservoir, thus preventing it from reaching the brake along the outer surface of the shaft in the axial direction. By arranging a felt ring of this type (or a similarly acting fluid collecting element), the effectiveness of the reservoir can be further improved and the brake unit even more effectively protected.

[0077] Fig. 9 shows a schematic representation of the basic structure of a shaft 13 described here. The bearing sections for the two bearings 11, 12 have different diameters, and the outer diameters of the bearings (or the corresponding diameters in the housing) can also be designed to match the size. Optionally, the fixed bearing 11 is smaller in diameter but larger in terms of the bearing rings and rolling elements than the floating bearing 12.

[0078] List of reference symbols

[0079] I Elevator car

[0080] 10 Drivetrain arrangement

[0081] II first bearing, in particular sealed or self-sealing fixed bearing

[0082] 11.1 Outer ring of the fixed bearing

[0083] 11.2 Inner ring of the fixed bearing

[0084] 12 second bearing, especially loose bearing

[0085] 13 Wave

[0086] 13.1 first camp section

[0087] 13.2 second camp section

[0088] 13.3 (Wave) shoulder, especially one-sided

[0089] 13.3a (Wave) web in the form of a central web, bordering on both sides

[0090] 13.4 Drifting zone, possibly comprising several sections

[0091] 13.5 individual drift zone section, delimited by a bridge or shoulder

[0092] 13.6 Gear section especially for brake unit

[0093] 13.7 Key section (rotationally fixed connection to the rotor)

[0094] 13.8 axial limitation of the key section, in particular by shaft shoulder

[0095] 14 Felt ring or similar collecting / receiving element

[0096] 15 Reservoir

[0097] 16 Washer for fixing the fixed bearing, especially washer

[0098] 17 Brake unit, especially with brake disc

[0099] 18 fasteners for disc(s)

[0100] 19 housings

[0101] 19. 1 Contact surface or fastening section on the front side of the housing

[0102] 19.2 Braking surface section

[0103] 19.3 Housing bushing for shaft

[0104] 19.9 Guide, aperture, baffle

[0105] 20 Belt drive unit (traction machine)

[0106] 21 belts

[0107] 23 Engine, drive

[0108] 100 elevator system

[0109] 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 center web Bl 3.4 (absolute) drive zone width b 13.5 Width of the individual drive zone section b21 Width of the individual belt

[0110] B21 (absolute) belt width C15 Contour or cross-sectional geometry of the reservoir

[0111] DO Shaft diameter at the first end (especially gear section)

[0112] Dl Shaft diameter in the first bearing section or inner diameter of the first bearing

[0113] D2 (first) shoulder diameter (shaft diameter in the area of ​​a first shoulder)

[0114] D3 Driving zone diameter (shaft diameter in the area of ​​the driving zone) D4 (central) web diameter (shaft diameter in the area of ​​a web)

[0115] D5 (second) shoulder diameter (shaft diameter in the area of ​​a second shoulder)

[0116] D6 Shaft diameter in the second bearing section or inner diameter of the second bearing

[0117] D7 Shaft diameter at the second end (especially keyway section, rotor coupling) L13 Absolute length of the shaft RI 5 Deepest point of the reservoir (radially outermost)

Claims

Patent claims 1. Drive train arrangement (10) for a drive unit / belt drive unit (20) of an elevator installation (100), comprising a shaft (13) mounted in a housing (19) in at least two bearings (11, 12); characterized in that at least one component of at least one of the bearings (11, 12) is secured axially fixedly on the shaft (13) in several circumferential positions, each by means of at least one disk (16) interacting with the housing (19), without a bearing cover.

2. Drive train arrangement (10) according to claim 1, wherein the at least one component of the at least one bearing is secured in the plurality of circumferential positions by fixing the at least one disc (16) to the housing (19), in particular with the respective disc in a radially overlapping arrangement between the housing and the outer ring (11.1) of the respective bearing (11, 12).

3. Drive train arrangement (10) according to one of the preceding claims, wherein the at least one disc (16) in each of the plurality of circumferential positions comes to bear against an outer ring (11.1) of the bearing in question.

4. Drive train arrangement (10) according to one of the preceding claims, wherein the discs (16) are arranged evenly distributed symmetrically over the circumference, in particular in at least three circumferential positions.

5. Drive train arrangement (10) according to one of the preceding claims, wherein the at least one disc provided in the respective circumferential position is fixed by means of a screw or a similarly acting fastening means (18), in particular with the respective screw in axial alignment at least approximately parallel to the shaft and outside on the housing (19).

6. Drive train arrangement (10) according to one of the preceding claims, wherein in an end section of the housing (19) in which the bearing in question is mounted, at least three bores or similar recesses, preferably arranged uniformly distributed over the circumference, are formed for receiving fastening means (18), in particular screws, which fix the discs.

7. Drive train arrangement (10) according to one of the preceding claims, wherein in an end section of the housing in which the bearing in question is mounted, the shaft with one end face and, together with the bearing in question, seals the corresponding housing bushing (19.3).

8. Drive train arrangement (10) according to one of the preceding claims, with a brake unit (17) acting on the shaft; wherein the drive train arrangement (10) has a reservoir (15) arranged between the bearings and the brake unit, adapted to hold bearing grease, wherein the reservoir (15) is arranged and designed such that bearing grease is driven by centrifugal force from / from an adjacent bearing (11, 12) or from the at least two bearings into the reservoir (15).

9. Drive train arrangement (10) according to claim 8, wherein the reservoir (15) is provided integrally on the housing (19), in particular is formed / configured exclusively by the housing.

10. Drive train arrangement (10) according to one of claims 8 to 9, wherein the reservoir (15) is designed in a ring-like manner with a circular segment-shaped or elliptical segment-shaped cross-sectional geometry and is arranged with a radial extension extending radially outwards at least beyond the adjacent bearing in such a way that bearing grease escaping from at least one bearing is driven radially outwards into the reservoir upon rotation of the shaft (13).

11. Drive train arrangement (10) according to one of claims 8 to 10, wherein the reservoir (15) is arranged on a housing end face provided for the arrangement of a brake disc in the first axial section adjacent to the housing end face.

12. Drive train arrangement (10) according to one of claims 8 to 11, wherein the reservoir is arranged axially immediately adjacent to one of the bearings and axially immediately adjacent to the brake unit (17) between the bearing and the brake unit.

13. Drive train arrangement (10) according to one of claims 8 to 12, wherein a / the lowest point (R15) of the reservoir is arranged at least 5%, preferably at least 10% further radially outward than the radius of a / the outer ring of at least the adjacent bearing.

14. Drive train arrangement (10) according to one of claims 8 to 13, wherein at least one drive zone for at least one belt of the drive unit is configured on the shaft, wherein the at least one drive zone is arranged between the bearings.

15. Drive train arrangement (10) according to one of claims 8 to 14, wherein the reservoir is between Fixed bearing (11) and brake unit (17) are arranged, in particular axially directly next to the fixed bearing and axially directly next to the brake unit.

16. Drive train arrangement (10) according to one of claims 8 to 15, wherein a felt ring (14) is arranged in an arrangement between the reservoir (15) and a bearing inner ring (11.2), in particular filling the axial section therebetween.

17. Drive train arrangement (10) according to one of the preceding claims, wherein the drive unit (20) of the elevator installation (100) comprises at least one belt drive, wherein at least one drive zone (13.4) for at least one belt of the drive unit is configured on the shaft between the bearings; wherein an inner diameter of a fixed bearing (11) of the bearings is smaller or larger than an inner diameter of a loose bearing (12) of the bearings and deviates from the inner diameter of the other bearing in such a way that, in the axial mounting direction, the bearing with the larger inner diameter can be applied over the shaft section provided for the bearing with the smaller inner diameter, in particular without contact.

18. Drive train arrangement (10) according to claim 17, wherein the inner diameters of the bearings differ from one another in such a way that remachining of the shaft is / can be minimized.

19. Drive train arrangement (10) according to one of claims 17 or 18, wherein the inner diameter of the fixed bearing is smaller than the inner diameter of the loose bearing.

20. Drive train arrangement (10) according to one of claims 17 to 19, wherein the smaller bearing is arranged between the drive zone and a / the brake unit.

21. Drive unit (20) with a drive train arrangement (10) according to one of the preceding claims, wherein the drive unit is designed as a belt drive unit with at least one belt engaging at least one drive zone (13.4) of the shaft, preferably with at least two or three drive zones and a corresponding number of belts.

22. Elevator installation (100) with at least one drive unit (20) according to the preceding claim.

23. Use of a shaft (13) which can be mounted in a housing (19) in at least two bearings (11, 12) for coupling drive components of a drive train arrangement (10) according to one of claims 1 to 19, in particular for coupling at least one belt of a drive unit / belt drive unit (20) with at least one component of the elevator installation to be driven, wherein at least one component of at least one of the bearings, in particular of the fixed bearing, is secured axially fixedly on the shaft in several circumferential positions, each by means of at least one disk (16) interacting with the housing (19) without a bearing cover, wherein the shaft (13) has at least one of the following features, in particular in combination with one another: the housing has a reservoir (15) arranged between the bearings and a toothed section of the shaft (13) provided for a brake unit (17), adapted to hold bearing grease,and / or wherein an inner diameter of the fixed bearing (11) is smaller or larger than an inner diameter of the floating bearing., 24. Drive train arrangement (10) according to one of the device claims 1 to 19, produced by dimensioning and arranging the shaft (13) and the housing (19) in such a way that the disks (16) securing the corresponding bearing (11, 12) in an axially fixed manner come to rest on the end face of the housing (19), and by forming a reservoir (15) receiving the bearing grease at least on the housing (19) by removing material, and optionally additionally also by machining a shaft section provided for the bearing with the smaller inner diameter by removing material.

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