US-20260125243-A1 - DRIVE TRAIN ASSEMBLY FOR A BELT DRIVE UNIT OF A LIFT SYSTEM AND CORRESPONDINGLY DESIGNED SHAFT AND USE THEREOF

US20260125243A1US 20260125243 A1US20260125243 A1US 20260125243A1US-20260125243-A1

Abstract

Even when designing drivetrains for elevator installations, an advantageous compromise between required resources and achievable technical (performance) data is desirable. Especially in the case of drivetrains with a belt drive, the shaft interacting with at least one belt at a driving zone requires structural optimization in order to be able to make use of improvement potential including with regard to further components of the drivetrain. According to the disclosure, the shaft has an absolute shaft length which is predefined by length dimensioning with reference to the width of the driving zone. In this way, a particularly advantageous compromise on the basis of length dependency and optionally in addition also of diameter dependency can be found, in particular in terms of optimization concerning both the material-machining outlay and smallest possible dimensions, wherein the respective drivetrain, on the basis thereof, can also be designed for different applications.

Inventors

Alexander Wölfel
Andreas Wilhelm
Florian Otto
Aleksandr Gentner

Assignees

TK ELEVATOR INNOVATION AND OPERATIONS GMBH

Dates

Publication Date: 20260507
Application Date: 20230926
Priority Date: 20221005

Claims (13)

1 . A drivetrain arrangement for a belt-drive unit of an elevator installation comprising: a shaft which has been mounted in a housing and on which a driving zone for at least one belt interacting with a/the belt-drive unit has been formed, wherein the driving zone has a driving-zone width wherein the shaft has at least one section whose axial length has been dimensioned in a manner dependent on the driving-zone width; wherein the absolute length of the shaft is greater than the driving-zone width according to a predefined/predefinable length factor, wherein the predefined/predefinable length factor is smaller than an upper threshold value, wherein the predefined/predefinable length factor lies between 2.5 and 3.3.
2 . The drivetrain arrangement according to claim 1 , wherein the predefined/predefinable length factor is smaller than the upper threshold value 3.0.
3 . The drivetrain arrangement according to claim 1 , wherein provision is made of at least two driving-zone sections which together form the driving zone the at least two driving-zone sections with the same driving-zone diameter, the at least two have been separated from one another by a web in each case, said web being provided in an encircling manner on the shaft such that the driving-zone sections have the same width.
4 . The drivetrain arrangement according to claim 1 , wherein the shaft is configured to interact with at least two belts which are guided on individual driving-zone sections of the driving zone said driving-zone sections being separated from one another in particular by webs.
5 . The drivetrain arrangement according to claim 1 , wherein the shaft has two bearing sections wherein the driving zone has been arranged between the bearing sections, directly adjacent to a first bearing section, which is provided for a first bearing, or directly adjacent to a second bearing section, which is provided for a second bearing.
6 . The drivetrain arrangement according to claim 1 , wherein the driving zone is delimited on both sides by bearing sections of the shaft.
7 . The drivetrain arrangement according to claim 1 , wherein the shaft has the greatest diameter in the region of the driving zone and has the second greatest diameter in the region of a first or second bearing section.
8 . The drivetrain arrangement according to claim 1 , wherein provision is made of two or three driving-zone sections which together form the driving zone wherein the driving-zone sections have been separated from one another by a web in each case, said web being provided in an encircling manner on the shaft, wherein the width of the web is, in terms of magnitude, in the range of 3 to 15% of the width of the individual driving-zone section.
9 . The drivetrain arrangement according to claim 1 , wherein the width of the driving zone including any shoulders and webs provided for separating driving-zone sections lies in the range of 28 to 42% of the absolute length of the shaft.
10 . The drivetrain arrangement according to claim 1 , wherein the shaft diameter is greater both in a first and in a second bearing section for bearings that delimit the driving zone than the shaft diameter in a further section that is adjacent to the respective bearing section, wherein the width of the driving zone lies in the range of 28 to 42% of the absolute length of the shaft.
11 . The drivetrain arrangement according to claim 1 , wherein the belt-drive unit is configured for coupling at least one drive of the belt-drive unit to at least one component to be driven of the elevator installation by at least one belt.
12 . (canceled)
13 . A method for use of a shaft, dimensioned in a manner optimized in terms of length, for a drivetrain arrangement of an elevator installation, the method comprising: coupling at least one drive of a belt-drive unit of the elevator installation to at least one component to be driven of the elevator installation by at least one belt, wherein the shaft is mounted in bearings on both sides of a/the driving zone wherein the shaft has at least one section whose axial length has been dimensioned in a manner dependent on the driving-zone width wherein the absolute length of the shaft is greater than the driving-zone width according to a predefined length factor, wherein the predefined length factor is smaller than an upper threshold value, specifically smaller than a length factor of 3.3, wherein the predefined/predefinable length factor lies between 2.5 and 3.3.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is a National Phase Entry under 35 U.S.C. § 371 of International Patent Application Serial No. PCT/EP2023/076546 filed Sep. 26, 2023, which claims the benefit of and priority to German Application Serial No. 10 2022 125 725.8 filed Oct. 5, 2022, the entire contents of both which are incorporated by reference in the present disclosure. TECHNICAL FIELD The present disclosure relates to a drivetrain arrangement for a belt-drive unit of an elevator installation. BACKGROUND In traction machines for elevator installations, inter alia material-efficient and space-saving construction is also of interest; this is also true of traction machines having a belt drive. A belt drive for an elevator installation has a shaft which is mounted in a housing and which has a driving zone via which the belt is guided and the torque is transmitted from the shaft. The shaft is mounted or supported in bearings on both sides of the driving zone. Here, it is the case that it is necessary to determine a respectively suitable construction of the drivetrain, on the one hand with regard to installation and mounting of the shaft, and on the other hand also with regard to material use and space requirement, whether in general or whether application-specific. The used/usable belt is predefined in particular by performance parameters, and therefore the task of the designer is inter alia to design the shaft or the whole drivetrain for different power levels or different applications in as scalable a manner as possible in such a way that, or to provide construction guidelines that are as generally applicable as possible such that, the aforementioned requirements can be met each as synergistically as possible. According to the prior art, the shaft with driving zone is provided as standard in a configuration with a greater or lesser degree of standardization. On this basis, there is interest in an improved manner of designing the drivetrain, that is to say in technical teaching that makes it possible for the configuration in particular of the shaft to be optimized. The publication US 2002/0100902 A1 describes variants of belt drives with in each case multiple belts which are guided around a shaft one next to the other in for example three or five driving-zone sections. Proceeding from the prior art, there is felt to be a need for further structural optimization of the drivetrain of a belt drive for elevator installations, in particular regarding the dimensions of the shaft. Not least, in particular with regard to potential savings in connection with the resources used for the construction, there is also interest in technical teaching which can be used in as scalable a manner as possible for (structural) optimization of the shaft. SUMMARY It is an object to provide a drivetrain arrangement in particular for elevator installations having a belt drive in the case of which the shaft is advantageously configured and dimensioned in terms of construction, with regard to a material-and cost-/resource-saving design. It is also an object to configure the shaft of a drivetrain arrangement for elevator installations with a belt drive in such a way that the shaft can advantageously interact in cooperation with further components of the drivetrain and can be advantageously installed. Said object is achieved by a drivetrain arrangement as claimed in claim 1 and by a shaft designed therefor and the use thereof according to the respective alternative independent claim. Advantageous refinements of the disclosure are explained in the respective dependent claims. The features of the exemplary embodiments described below can be combined with one another, unless explicitly stated otherwise. Provision is made of a drivetrain arrangement for a belt-drive unit of an elevator installation, having a shaft which has been mounted in a housing and on which a driving zone for at least one belt interacting with a/the belt-drive unit has been formed, wherein the driving zone has a driving-zone width, wherein the shaft has at least one section whose axial length has been dimensioned in a manner dependent on the driving-zone width; According to the disclosure, it is proposed that the absolute length of the shaft is greater than the driving-zone width according to a predefined/predefinable length factor, wherein the predefined/predefinable length factor is smaller than an upper threshold value, specifically smaller than or equal to (<=) a length factor of 3.3. This also allows optimized dimensioning essentially based on requirements of the belt coupling. In this case, the disclosure is also based on the concept of keeping the construction as slender as possible and of providing an advantageous installation situation. In other words, the shaft can be dimensioned so as to be as slender as possible on the basis of the driving-zone width, in particular in that the shaft is dimensioned to be as short as possible. The present discl