EP3914548A2 - Lift system - Google Patents

Abstract

The invention relates to a lift system (1) comprising a plurality of lanes (2VL, 2VR, 2H) which are orientated in a direction (z, y), at least one lift car (5), guide rails (22V, 22B, 22H) for guiding the lift car (5) along the lanes, at least one transfer unit (30) for transferring the lift car from one of the lanes to another of the lanes, characterised by toothed racks (23V, 23B, 23H) that are installed along the lanes, a drive (52-55) having a drive wheel (52) attached to the lift car (5), which can integrate with the toothed racks in order to apply a driving force to the lift car (5) for movement.

Description

Elevator system

Technical field

The invention relates to an elevator system.

Technical background

DE 10 2014 220 966 A1 discloses an elevator installation in which several cars are operated cyclically in a circulating mode, similar to a paternoster. In contrast to the classic paternoster, each car is driven independently of the other cars and can therefore stop at any stop independently of the other cars. Transfer units are provided to transfer the cars from a vertical lane to a horizontal lane, so as to transfer the cars between different vertical lanes. The drive is based on a linear motor.

Disclosure of the invention

It is an object of the present invention to provide an alternative elevator system, in particular an alternative to the comparatively complex linear motor. This problem is solved by an elevator system. Refinements are the subject of the dependent claims and the description.

The elevator installation comprises a plurality of lanes, which in at least one,

in particular are oriented in different directions,

at least one car, in particular a plurality of cars,

Guide rails for guiding the car or the car along the lanes;

at least one conversion unit for transferring the car from one of the lanes to another of the lanes. The elevator system further includes racks running along the

Lanes are installed, in particular comprising a movable rack; a drive with a drive wheel attached to the car, which can interact with the toothed racks in order to apply a driving force to the car for locomotion.

According to the invention, a rack and pinion drive is used instead of the conventional linear motor. Rack and pinion drives are already known; an application this

However, drive technology with the generic elevators with relocating units presents considerable difficulties in aligning the rails in the area of the relocator Transitional area of the converter. So far, this has been an obstacle to application. Solutions to these difficulties are now available, which are presented in the context of the description.

It is important to point out a fundamental problem when adjusting racks over long lengths. For an exact setting of toothed racks, it is necessary that the first tooth and the last tooth of the toothed rack are arranged at a distance from one another which corresponds to an integral multiple of the tooth pitch. If the building settles over time, i.e. the height of the building is reduced by 0.1%, for example, so the total extent of the setting corresponds to the multiple of a tooth pitch. This requires realignment of the racks, which have a constant length compared to the building. Comparatively easy to solve is the fixed-lot storage of the

Rack, if the rack is designed throughout the entire shaft system. In the generic elevator system, however, the converters are arranged in regular sections, which change their absolute position in height when the building is set and thus force the racks attached to them to misalign with the neighboring racks.

Cogwheel railways generally do not have this problem, so that solutions from the technical field of cogwheel railways cannot be used. On the one hand, betting does not occur to the extent that is the case with buildings; on the other hand, passengers on cogwheels expect significantly less driving comfort than the residents of ultra-modern high-tech buildings.

In particular, a plurality of racks are arranged along a lane.

In particular, a rack that is permanently installed in the shaft is arranged at least temporarily in the track direction adjacent to a movable, in particular rotatable, rack.

In particular, there is one in the track direction between two adjacent racks

Rack gap provided. The toothed rack gap may be necessary in order to enable two adjacent toothed racks to move relative to one another in the area of the converter.

In one embodiment, a toothing with a

Void tooth pitch provided, the gap tooth pitch deviating from a defined tooth pitch within a rack. In particular, the gap tooth pitch is larger than a defined tooth pitch within the rack. The deviating gap tooth division arises in particular only by arranging two adjacent teeth on

Rack transition with an increased distance. The geometry of the tooth is in particular identical to that of the other teeth.

The deviation of the gap tooth division from the defined gap tooth division can

in particular be at least 5%, 10%, 20% more. In particular, the deviation is such that the gap tooth pitch is larger than the defined tooth pitch.

In one embodiment, an adjustment arrangement is provided, by means of which the position of at least one rack, in particular several racks, can be changed in a defined manner in the track direction. In particular, the first setting arrangement is in particular

set up for setting a dimension of a rack gap in the track direction, in particular a gap tooth pitch of the rack gap.

The term lane direction denotes the direction in which the car or the drive wheel moves in an operating state. The rack is particularly aligned in the direction of the track. When traveling vertically, the track direction is aligned vertically; at a

Horizontal travel, the track direction is aligned horizontally. Deviating / oblique directions are also possible.

In one embodiment, a variable-length rack is provided with a plurality

Tooth sections provided. This can be part of the setting arrangement. The positions of individual tooth sections with respect to one another can or are adjustable in the track direction within the variable-length rack using a length adjuster. Misalignments can be remedied locally using the variable-length rack without the need for time-consuming readjustment of a large number of racks.

In one configuration, the variable-length toothed rack has at least three tooth sections, the spacing of which from one another during a joint actuation of one

common adjusting means, in particular an adjusting screw, can be changed uniformly. The joint actuation causes a simple, even change of the

Tooth division between the tooth sections. The more even the gap tooth divisions are, the smaller the deviations from the defined tooth pitch and thus the less

Loss of comfort.

Basically, each rack in the elevator system can be designed as such a variable-length rack. In one embodiment, the drive is suitable, in particular is set up to interact with toothings of different tooth pitch. This makes the drive robust against

Rack misalignment. The tedious adjustment can be omitted.

In particular, the toothing comprises a defined tooth pitch and in some places a toothing that deviates from the defined tooth pitch by at least 10%, preferably at least 20%. The deviation of the tooth pitch can also be in the range between 40% and 60%, i.e. means that the toothing is aligned essentially out of phase. Without further measures, the tooth of the drive wheel would now hit the tooth of the rack. In one configuration, the drive is suitable, in particular it is set up or can be set up to interact with a toothing in a defined tooth pitch (1Z) and in a tooth pitch (1.5xZL) which deviates by 30-70%, in particular approximately 50%, of it . Without further measures, the tooth of the drive wheel would now hit the tooth of the rack.

In one embodiment, the drive comprises a controller which is set up to control the drive as a function of tooth pitches which vary in the direction of the track. For this purpose, the rotational speed of the drive wheel can be specifically adjusted, in particular reduced, before the drive wheel engages in a rack area with an enlarged tooth pitch.

In particular, the drive has a first and a second drive wheel on a common elevator car, the drive power of the second drive wheel being increased when the drive power of the first drive wheel is reduced when a toothed rack gap is passed over. The alignment requirement is consequently shifted from the rack to the drive.

Information that is required for the control depending on tooth pitches that change during operation can be stored in a configuration in a data memory and can be made available in operation. In this case, the drive knows where the teeth are. The drive can then align itself accordingly, so that it always interacts correctly with the racks.

Information that is required for the control as a function of tooth pitches that change during operation can be recorded by a tooth sensor during operation. In particular, the tooth sensor rushes ahead of the drive wheel in the direction of the track and thus detects the teeth in the area of the toothed rack that is to be passed next. This allows the required information to be recorded in real time; in this respect is one

Mapping of gaps is not required. In one embodiment, a rack comprises a bendable tooth. The bendable tooth represents in particular an outermost tooth of a rack.

The elevator installation has in particular a shaft height in the first, in particular vertical, direction of at least 100 m, in particular at least 200 m.

The maximum car speed of the car in the first, in particular vertical, direction is in particular at least 8 m / s, in particular at least 9 m / s or 10 m / s.

Brief description of the drawing

The invention is explained in more detail below with reference to the figures. It shows schematically in each case

1 shows a section of an elevator installation according to the invention in perspective

Presentation;

2 shows a rack area and a car of the elevator system according to FIG. 1 in FIG

schematic side view;

Figure 3 shows a transition between two racks of the elevator system of Figure 1 in a schematic side view;

FIG. 4 shows several toothed racks with an adjustment arrangement of the elevator installation according to FIG. 1 in a schematic side view;

FIG. 5 shows a drive wheel when driving over an unaligned rack transition of the elevator installation according to FIG. 1 in a schematic side view in different situations;

Figure 6 shows the speed profile of the drive wheel in the situations of Figure 5;

Figure 7 shows a drive wheel when driving over an aligned rack transition

1 in a schematic side view in different situations;

Figure 8 shows the speed profile of the drive wheel in the situations of Figure 7; FIG. 9 different representations of a variable-length toothed rack of the elevator installation according to FIG. 1;

FIG. 10 shows a drive wheel when driving over an unaligned toothed rack transition of the elevator system according to FIG. 1 in a schematic side view in different situations with an adapted drive wheel speed;

FIG. 11 shows the speed profile of the drive wheel in the situations according to FIG. 10;

FIG. 12 shows a toothed rack with a bendable tooth of the elevator installation according to FIG. 1 in

schematic side view.

Description of embodiments

1 shows parts of an elevator system 1 according to the invention. The elevator system 1 comprises a plurality of lanes 2H, 2V, along which a plurality of cars 5a-5h are guided.

There are several, here exemplarily two, vertical lanes 2VL, 2VR aligned in a first direction, along which the car 10 can be moved between different floors. There are horizontal between the two vertical rails 2VL, 2VR

Arranged lanes 2H, along which the car 5 can be moved within each floor. Furthermore, the horizontal lane 2H connects the two vertical lanes 2VL, 2VR to one another. Thus the horizontal lane 2H also serves to transfer the car 10 between the two vertical lanes 2VL, 2VR, e.g. to carry out a modern paternoster operation. There are further such horizontal lanes 2H provided in the elevator system 1, which connect the two vertical rails to one another. Furthermore, further vertical lanes can be provided, which are not shown.

Guide rails 22 V, 22H, 22D are provided along the lanes for guiding the cars. For this purpose, the cars have guide rollers, not shown.

The guide rails include backpack guide rails 22 V, 22H, 22D.

Backpack guide rails are arranged on a common side of the car. The car 5, in particular the center of gravity of the car 5, is always cantilevered. The weight is determined by the introduction of bending moments on the

Transfer backpack guide rails. The backpack guide rails include 22V fixed vertical backpack guide rails aligned along the vertical track. The backpack guide rails include fixed horizontal backpack guide rails 22H aligned along the horizontal track 2H.

The car can be moved from one of the vertical lanes 2V to the other of the vertical lanes 2V via a transfer arrangement 3.

The transfer arrangement 3 comprises two transfer units 30 and a horizontal one

Backpack guide rail 22H. The elevator car 5 can be transferred between one of the vertical backpack guide rails 22V and the horizontal backpack guide rails 22H via the conversion units 30. The conversion unit 30 comprises a rotatable one

Backpack guide rail 22D.

All guide rails are installed at least indirectly in a shaft wall 20. Up to this point, the elevator installation basically corresponds to what is described in WO 2015/144781 A1 and in DE10 2016 211 997A1 and DE 10 2015 218 025 A1.

The cars are driven by a toothed drive. To this end, racks 23V, 23H, 23D, each with a large number of teeth 24, are installed in the shaft. This

Racks 23 interact with at least one drive wheel 52 which is attached to the car 5. A motor 53 is attached to the car 5 to drive one or more drive wheels. A plurality of motors can also be provided for driving the plurality of drive wheels, as schematically illustrated in FIG. 2.

Grip the racks

vertical racks 23V aligned parallel to the fixed vertical guide rails 22V,

horizontal racks 23H aligned parallel to the fixed horizontal guide rails 22H, and

- Movable, in particular rotatable racks 23D, which are aligned parallel to the movable, in particular rotatable guide rails 22B.

In the present exemplary embodiment, the vertical direction and the horizontal direction are merely an example of a first and second direction, as set out in the claims.

Figure 3 shows sections of adjacent racks, here a vertical rack 23 V and a movable rack. The racks have a defined tooth pitch ZI. To the To ensure mobility of the movable rack 23B, a rack gap 23L is provided between the racks. In the area of the toothed rack gap, the teeth adjacent to the gap have a gap tooth pitch ZL to one another.

In one configuration, the toothed racks 23 are designed and arranged in such a way that, despite the toothed rack gap 23L, the gap tooth pitch ZL corresponds to the defined tooth pitch ZI. This enables a smooth transition of the drive wheel 53 from a rack 23 to the adjacent rack.

The attachment of the toothed racks to a shaft 6 is described with reference to FIG. 4. The shaft can be through a concrete wall or through a frame on the shaft side

Elevator components are attached. For the fastening, the elevator installation has, among other things, an adjustment arrangement 7, by means of which the positions of one or more racks 23 in the track direction S can be adjusted. Based on the setting arrangement, the

Gap tooth pitches ZL set to any value, in particular to the value of the defined tooth pitch ZI.

The setting arrangement 7 comprises a plurality of setting points 71. Each setting point comprises a shaft-side fastening 73 and a rack-side fastening 74. Between the shaft-side fastening 73 and the rack-side fastening 74 there is one

Screw connection 75 is provided, on the basis of which an orientation of the shaft-side fastening 73 and the rack-side fastening 74 can be varied. By varying this orientation, the position of the respective rack, which is fastened with the rack-side fastening 74, can be adjusted and finally the gap tooth pitches ZL can also be adjusted.

For example, in the upper area of FIG. 4 it can be seen that the upper fixed vertical rack 23 V has not yet been aligned. The gap tooth pitch is ZL

movable adjacent vertical rack 23B here any value between the single defined tooth pitch IxZl and twice the defined tooth pitch 2xZl.

5, the travel path of the drive wheel 53 over the rack gap 23L shown in the upper part of FIG. 4 is shown. The rotational position can be tracked using the individual intervention means highlighted by black shading in the illustration. The rack gap 23L is not optimally set in the illustrations in FIGS. 5a-d and thus has, for example, a gap tooth pitch ZL of approximately 1.5 × Z1. When moving over the rack gap 23L from bottom to top, the drive wheel 53 consequently do not plunge gently into the corresponding tooth gap, but rather collide with the head of the first gear of the vertical rack (see “Blitz” in Figure 5d). FIG. 6 shows the rotational position w52 or the constant rotational speed v52 of the drive wheel over time during the situations shown in FIGS. 5a-d.

By correspondingly actuating the setting arrangement, the gap tooth pitch ZL is set to a desired value, in particular IxZl, in one setting process (see FIG. 7a). If the drive wheel 53 now drives over the toothed rack gap 23L, it becomes a smooth one

Immersion of the drive wheel in the first tooth gap of the next rack reached (Figure 7d). The drive wheel can interact seamlessly with the next rack (FIG. 7e). FIG. 8 shows the rotational position w52 or the constant rotational speed v52d of the drive wheel over time during the situations which are shown in FIGS. 7a-e.

However, it can be problematic that an alignment of a second rack relative to a first rack requires a new alignment of a third rack relative to the position-altered second rack. This requirement can be repeated as often as required for a series of racks.

Furthermore, it can be seen from the previous description that the toothing shown in FIGS. 5 and 7 has no tolerance for a deviation in the tooth spacing of +/- 50%. However, the toothing has a tolerance to a deviation in the

Tooth spacing of +/- 20%. This fact is used in one embodiment in order to make the tooth spacing in the transition region of adjacent toothed racks sufficiently small, even if the toothed racks themselves have an excessive degree of misalignment. This is explained on the basis of FIG. 9.

Figure 9 shows an embodiment of the adjustment arrangement. The setting arrangement here has a second setting points 72 within a rack 23. To this end, the rack 23 has a plurality of tooth sections 23S1, 23S2 23S3. The tooth pitch can be in

Transition area between two tooth sections based on the defined tooth pitch 1Z can be changed, in particular enlarged, by an adjustable tooth pitch difference dZ. The toothed rack according to FIG. 6 thus has a first tooth section 23S1

Main section, which can be connected to the shaft wall via the adjustment arrangement (see also Figure 4). The first tooth portion 23S1 has a plurality of teeth.

A second tooth section 23S2 and a third tooth section 23S3, which each have, in particular precisely, one tooth, adjoins the edge, that is to say, faces the respective adjacent rack. A length adjuster 8 has an adjusting screw 81. Based on Adjustment screw 81, the tooth sections are connected in series. The tooth pitch difference dZ can be changed by turning the adjusting screw 81 (FIG. 9b).

So that the gap width between the tooth sections can be adjusted uniformly by a defined rotation of the adjusting screw 81, the adjusting screw 81

different thread areas Gl, G2, G3 (Figure 9c). The different

Thread areas Gl, G2, G3 have at least partially different pitches.

A first slope is provided in a first area G1. Based on the first

Thread section Gl is only the adjusting screw 81 compared to the first

Tooth section 23S1 held in a defined orientation. To this end, the first

Tooth section 23S1 a through hole Bl (without internal thread) for receiving

Adjustment screw 81 on. The adjusting screw 81 is fastened on the first tooth section 23S1 by means of nuts 82 by means of the first threaded section Gl.

A second pitch is provided in a second thread area G2; the second tooth section 23S2 is guided thereon, the second tooth section having a second bore B2 with an internal thread (matching the external thread of the second threaded section). A third pitch is provided in a third thread area G3; this becomes the third

Tooth section 23S3 guided, the third tooth section having a third bore B3

Has internal thread (matching the external thread of the third threaded section). The third slope is twice the second slope. By turning the adjusting screw 81, the gap 23L between the second tooth portion 23S2 and the first

Tooth section 23S1 and between the third tooth section 23S3 and the second

Tooth section 23S3 can be adjusted evenly since the displacement of the third

Tooth section 23S2 is twice as large as the displacement of the second tooth section 23S2.

In the present case, it would also be possible for the thread in the second and third

Thread section Gl, G2 is identical.

It can be seen that, by varying a plurality of tooth pitches, a fundamentally intolerable misalignment (ZL = 1.5xZl) of the adjacent racks can be converted into a plurality of tooth pitches with tolerable misalignment (IZ + dZ). With this measure, individual toothed rack transitions can be set in a simple manner, without the need to readjust further toothed rack transitions. Another embodiment is described with reference to FIG. A transition area between two toothed racks, which has not been set, is shown again analogously to FIG. 5. FIG. 11 shows that the toothed rack gap 23L has, for example, a tooth gap ZL of approximately 1.5 × Z1. FIG. 11 shows the rotational position w52 or the rotational speed v52 of the drive wheel 52 over time during the situations which are illustrated in FIGS. 10a-e. If the drive wheel 52 now comes into the area of the toothed rack gap, the drive wheel is braked briefly, in this case the rotational position w52 of the drive wheel 52 now follows the extended tooth pitch ZL = 1.5XZ. The collision of the drive wheel with the head of the tooth (see FIG. 5d) is prevented in this way without the gap length having been set to a specific dimension. It goes without saying that the course of the rotational speed v52 can also be designed to be significantly gentler and therefore less square than is shown in FIG. 11. For this purpose, the motor control 45 is provided with information 57 which

To draw conclusions about the position of the teeth to be run over soon.

This is implemented in a first variant by position-dependent control of the drive motor which drives the drive wheel. For this purpose, the tooth pitches in the area of the rack gaps are initially recorded during the installation of the elevator system and in one

Data storage 55 stored. For example, positions of tooth tips can then be made available as information 57 during the operation of the motor controller 54. In the database, the individual values of the gap tooth divisions are linked to the associated positions along the lane. The difference between the current position and the relative position between the drive wheel and a tooth tip can then be used. Alternatively, only a link between a target drive wheel position and the position of the cabin can be stored in the data memory; this link then takes into account the tooth pitch at the corresponding position.

In a second variant, a tooth sensor 56 is provided, which drives the car along the lane. The tooth sensor detects the shape of the rack, in particular the position of tooth heads, before the drive wheel comes into engagement with the respective tooth head. In this respect, sensor 56 also provides information 57 about the relative position between the drive wheel and the tooth tips. Such a sensor can be a laser scanner or a Hall sensor, each of which can detect a distance from a surface; if the distance to the surface is small, the presence of a tooth head at the sensor position is registered. A variety of other sensors are conceivable. The configuration according to FIG. 11 therefore only requires a rough alignment of the racks with respect to one another, each with large tolerances. During a phase between the representations of FIGS. 10c and 10e, the drive connection via the drive wheel 52 to the rack is interrupted. If the car has only one drive wheel 52, the car can then briefly be in a kind of parabolic flight. However, since this state only lasts a few fractions of a second, passengers hardly notice it. The duration of the drive interruption, i.e. the gap tooth position in combination with the driving speed, is therefore decisive for the comfort behavior of the elevator system.

The loss of comfort caused by the drive interruption can be reduced or eliminated if the car (as shown by way of example in FIG. 2) has at least two

Has drive wheels, of which at least one drive wheel is always in drive connection with a rack. Optionally, the drive power of the gearwheel connected to the drive can be temporarily increased in order to at least partially compensate for the brief loss of drive power of the other drive wheel.

FIG. 12 shows a toothed rack 23 with an outermost tooth 24D, which is designed to be bendable. The tooth can be made of hard rubber. When the drive wheel hits the deflectable tooth 24D, a force F is generated at the head of the tooth, which force bends the tooth against the direction of travel / track direction S, whereby a misalignment can be compensated for to a certain extent.

Reference list

1 elevator system

2H horizontal lane

2VL, 2VR vertical lane

22V fixed guide rail vertical 22H fixed guide rail horizontal 22B movable guide rail

23V vertical rack

23H horizontal rack

23B movable rack

23L rack gap

23Q variable-length rack

2351 first tooth section

2352 second tooth section

2353 third tooth section

24 tooth

24D bendable tooth

3 transfer arrangement

30 conversion unit

31 bogie

5 car

51 leadership roles

52 drive wheel

53 drive motor

54 Engine control

55 data memories

56 tooth sensor

57 information

6 shaft wall

7 Adjustment arrangement

71 setting point 73 shaft-side fastening

74 rack-side fastening

75 adjusting screw

8 length adjusters

81 adjusting screw

82 mother

H21 L Height of the side guide rail gap

H5 height of the car

ZI defined tooth pitch

ZL gap tooth division

dZ adjustable tooth pitch difference

S track direction

v52 Rotation speed of the drive wheel w52 Rotation position of the drive wheel

F force

Claims

Expectations 1. elevator system (1), comprising: a plurality of lanes (2VL, 2VR, 2FD, which are aligned in one direction (z, y), at least one car (5), Guide rails (22V, 22B, 22H) for guiding the car (5) along the Lanes; at least one transfer unit (30) for transferring the car from one of the Lanes to another of the lanes, marked by - racks (23V, 23B, 23H) installed along the lanes, - A drive (52-55) with a drive wheel (52) attached to the car (5), which can interact with the toothed racks in order to apply a driving force for locomotion to the car (5). 2. elevator system (1) according to the preceding claim, characterized, that a plurality of racks (23V, 23B, 23H) are arranged along a lane (2VL, 2VR, 2FD). 3. elevator system (1) according to one of the preceding claims, characterized, that at least at times a rack (22V, 22H) permanently installed in the shaft is arranged in the track direction adjacent to a movable, in particular rotatable, rack (23B). 4. elevator system (1) according to one of the preceding claims, characterized, that in the track direction (S) between two adjacent racks one Rack gap (23L) is provided. 5. elevator system (1) according to the preceding claim, characterized, that a toothing with a gap tooth pitch (ZL) is provided in the toothed rack gap (23L), the gap tooth pitch (ZL) being defined by a defined tooth pitch (1Z) deviates within a rack (23), in particular is greater than a defined tooth pitch (1Z) within the rack (23). 6. elevator system (1) according to one of the preceding claims, marked by an adjusting arrangement (7) which is set up for changing the position of at least one rack, in particular a plurality of racks, in the track direction (S); the setting arrangement is in particular set up for setting a dimension (ZL) of a rack gap (23L) in the track direction (S), in particular a gap tooth pitch (ZL) of the rack gap (23L). 7. elevator system (1) according to one of the preceding claims, marked by a variable-length toothed rack (23Q) with a plurality of toothed sections (23S1, 23S2, 23S3), the positions of individual toothed sections in relation to one another in the track direction (S) within the variable-length toothed rack (23Q) being adjustable using a length adjuster (8). 8. elevator system (1) according to the preceding claim, characterized, that the variable-length toothed rack (23Q) has at least three tooth sections (23S), the spacing (dZ) of which from one another can be changed uniformly during a joint actuation of a common adjusting means (81), in particular an adjusting screw (81). 9. elevator system (1) according to one of the preceding claims, characterized, that the drive is suitable, in particular is set up to interact with toothings of different tooth pitch. 10. elevator system (1) according to the preceding claims, characterized, that the toothing comprises a defined tooth pitch and one that deviates from the defined tooth pitch by at least 10%, preferably at least 20% Gearing includes. 11. Elevator system (1) according to one of the preceding claims, characterized, that the drive is suitable, in particular is or can be set up, to interact with a toothing in a defined tooth pitch (1Z) and in a tooth pitch that deviates by 30-70%, in particular approximately 50% (1.5xZL) in the track direction. 12. Elevator system (1) according to one of the preceding claims, characterized, that the drive comprises a controller (54) which is set up to control the drive as a function of tooth pitches which vary in the track direction (S). 13. Elevator system (1) according to one of the preceding claims, characterized, that the rotational speed of the drive wheel (52) is specifically adapted, in particular reduced, before the drive wheel engages in a rack section with an enlarged tooth pitch; In particular, the drive has a first and a second drive wheel on a common elevator car, the drive power of the second drive wheel being increased when the drive power of the first drive wheel when driving over one Rack gap is reduced. 14. Elevator system (1) according to one of the preceding claims 12 or 13, characterized, that information (57) which is required for the control as a function of tooth pitch changes during operation is stored in a data memory (55) and can be made available in operation. 15. elevator system (1) according to one of claims 12 to 14, characterized, that information (57) which is required for the control as a function of tooth pitches which change during operation, during the operation of one Tooth sensor (56) are detected, in particular wherein the tooth sensor is designed to lead the drive wheel (52) in the direction of the track (S). 16. elevator system (1) according to one of the preceding claims, characterized, that a rack comprises a bendable tooth (24D), the bendable tooth (24D) in particular representing an outermost tooth of a rack.