Elevator car assembly for a double-deck elevator

Abstract

The invention relates to an elevator car assembly (2) for a double-deck elevator (1), comprising: an elevator car frame (5) which can be installed in a shaft (6) in a movable manner between multiple floors; two elevator cars (3, 4) which are connected to the elevator car frame (5) such that the elevator cars can be moved together with the elevator car frame (5) and are arranged one over the other when the elevator car frame (5) is installed in the shaft (6) in a movable manner between the floors, wherein a spacing (A) between the elevator cars (3, 4) arranged one or the other can be adjusted by moving the elevator cars (3, 4) relative to each other by means of an actuator (8); and a vibration damper (13) which comprises a damping mass (16) and an elongated damping spring (15). The damping mass (16) is connected to a free end of the damping spring (15), and the other end of the damping spring (15) is connected to an elevator car assembly (2) component (3, 4, 5, 8, 12, 22, 23) which is susceptible to vibrations. The damping mass (16) and the damping spring (15) are adapted to each other such that the vibration damper (13) generates desired vibrations during the operation of the actuator (8), said vibrations counteracting undesired vibrations of the component (3, 4, 5, 8, 12, 22, 23) which is susceptible to vibrations.

Description

[0001] Car arrangement for a double-decker elevator

[0002] The present invention relates to a car assembly for a double-decker elevator. Furthermore, the invention relates to a double-decker elevator, a method for tuning a vibration damper of a car assembly for a double-decker elevator, and a control unit for implementing this method.

[0003] In addition to single-car elevators, so-called double-decker or double-decker elevators can be used to transport people and / or objects between floors of a building. A double-decker elevator is essentially characterized by a car frame in which two cars or elevator cabins are arranged one above the other. By moving the car frame with the cars arranged within it, the cars can be moved together and thus stop at two floors above one another simultaneously.

[0004] Since floor heights can vary within a building, double-decker elevators are often equipped with an adjustment mechanism that allows the vertical distance between the two elevator cars to be adjusted, for example automatically during the journey to the next stop.

[0005] The adjustment mechanism may, for example, comprise an electric spindle drive. During vertical adjustment of one or both of the elevator cars using such a drive, undesirable oscillations of the entire elevator car assembly or parts thereof, particularly the car frame and / or the driven car, may occur in certain situations, for example, at certain drive speeds. These oscillations may result in vibrations and / or noise, thus reducing ride comfort.

[0006] EP 1 074 503 Bl shows an example of a double-decker elevator with two spindle drives for the vertical adjustment of two elevator cars within one elevator car frame.

[0007] EP 3 176 121 B1 describes a car assembly consisting of a car and a car frame, which is connected to the car via a damper. The damper serves to dampen vibrations that are transmitted via guide rails to the car frame and from there to the car during elevator operation. For this purpose, the damper is attached at its first end to a floor of the car and at its second end to the car frame. The two ends are connected to each other via a damping element, for example, made of rubber.

[0008] There may therefore be a need for an improved car arrangement for a double-decker elevator with which undesirable oscillations, for example in the form of vibrations and / or noise, can be reduced or limited during operation of the double-decker elevator, in particular during vertical adjustment of the two cars relative to each other.

[0009] In addition, there may be a need for a method that enables automatic adaptation of a vibration absorber of such a vibration-damped elevator car arrangement to different operating conditions.

[0010] Furthermore, there may be a need for a corresponding control unit and a corresponding double-decker elevator.

[0011] These needs can be met by the subject matter of the independent claims. Advantageous embodiments are set forth in the dependent claims, the following description, and the accompanying figures.

[0012] A first aspect of the invention relates to a car assembly for a double-deck elevator. The car assembly comprises: a car frame that can be displaceably mounted in a shaft between several floors; two cars that are connected to the car frame in such a way that they can be displaced together with the car frame and—when the car frame is displaceably mounted in the shaft between the floors—are arranged one above the other, wherein a distance between the superimposed cars can be adjusted by displacing the cars relative to each other using an actuator;a vibration damper comprising a damper mass and an elongated damper spring, the damper mass being connected to one free end of the damper spring, and the damper spring being connected at its other end to a vibration-prone component of the car assembly. The damper mass and the damper spring are coordinated with one another such that, during operation of the actuator, the vibration damper is set into desired vibrations that counteract, i.e., attenuate or eliminate, undesired vibrations of the vibration-prone component. The car frame can be mounted so that it can be displaced vertically between floors when in an operational state.

[0013] The car frame can be considered a frame-like structure consisting of several beams and / or support structures. For example, in operational condition, the car frame can be guided by guide shoes and / or rollers along at least one guide rail anchored in the shaft.

[0014] In the simplest case, the car frame can be constructed, for example, from two (horizontal) crossbeams and two (vertical) longitudinal beams, which are connected to form a single frame via the crossbeams. The car frame can also have three (horizontal) crossbeams. The cars can be arranged one above the other within this frame. For example, each longitudinal beam can be guided along a guide rail.

[0015] As mentioned at the beginning, the two elevator cars can be moved together in the shaft by moving the car frame along the guide rail(s), thus stopping simultaneously at two (directly) superimposed floors. Using the actuator, for example in the form of one or more spindle, chain, or rack drives, it is possible to adjust the vertical distance between the elevator cars to the vertical distance between two (directly) superimposed floors at which the elevator cars are to stop simultaneously.

[0016] It is possible for only one of the elevator cars to be movable relative to the car frame using the actuator, while the other car is permanently connected to the car frame. Alternatively, both cars can be movable relative to the car frame using the actuator or multiple actuators.

[0017] The actuator can, for example, comprise an electric drive motor and a gear that couples a drive shaft of the drive motor to a spindle. The spindle can be rotatably mounted in a spindle nut, which can be suitably attached to one of the stacked elevator cars, for example, the lower car. Rotating the spindle changes the position of the spindle nut relative to a longitudinal direction of the spindle, depending on the direction of rotation. This also changes the distance between the stacked elevator cars. The actuator can additionally comprise a braking system, in particular a redundant braking system using spring-applied brakes. A "vibration damper" can be understood as a pendulum-type vibration damper clamped on one side.The damper mass and the damper spring form a mass-spring system with a specific natural frequency, which is tuned to the resonance frequencies of the vibration-prone component(s) to which it is attached, such that unwanted vibrations of these components are canceled or attenuated by (desired) vibrations of the mass-spring system according to its natural frequency. The term "spring" can encompass various types of elastically deformable bodies. In particular, the damper spring can be made of at least one elastically deformable material, for example, spring steel or various metallic and / or non-metallic elastically deformable materials, and / or with a geometry that promotes the elastic deformation of the damper spring. For example, the damper spring can also be designed with a spiral spring or a helical spring.

[0018] Such a vibration damper, especially if designed as a passive damper, can have a very simple design and is therefore easy to install and remove. Furthermore, such a vibration damper is very robust and, unlike rubber dampers, virtually maintenance-free.

[0019] The vibration absorber can have one or more fixed natural frequencies. A vibration absorber design that allows for a change in its natural frequency(ies) is also possible, for example, using a separate actuator designed to change the position of the damper mass relative to the damper spring (see also below).

[0020] In order to achieve the greatest possible damping effect, the vibration absorber should be placed as close as possible to the center of gravity of the vibration-prone component.

[0021] The vibration absorber can be mounted hanging, standing or lying down, for example.

[0022] The vibration absorber, or more precisely the connected end of the damper spring, can also be connected to several vibration-prone components of the elevator car assembly at the same time.

[0023] The elevator car arrangement can also comprise two or more than two, for example four, six, or eight vibration dampers, which can be connected to the same vibration-susceptible component and / or to different vibration-susceptible components. It is possible for the damper springs of different vibration dampers to protrude from the vibration-susceptible component in different, for example, opposite, directions. For example, one of the damper springs can protrude upwards so that the respective damper mass rests on the damper spring, whereas another of the damper springs can protrude downwards so that the respective damper mass hangs from the damper spring. Alternatively, the damper springs can protrude in different horizontal directions in a corresponding manner.

[0024] A second aspect of the invention relates to a preferably computer-implemented method for tuning a vibration damper of a car assembly for a double-deck elevator. The car assembly can be the car assembly according to an embodiment of the first aspect of the invention described above or below, in which the damper mass is movable between different longitudinal positions in the longitudinal direction of the damper spring, and the vibration damper further comprises a servomotor for adjusting the damper mass between the longitudinal positions.The method comprises: receiving vibration data indicating current frequencies of the unwanted vibrations; determining a selected longitudinal position from the various longitudinal positions between which the damper mass is movable in the longitudinal direction of the damper spring, wherein the vibration damper has a natural frequency tuned to the current frequencies when the damper mass is in the selected longitudinal position; generating a control command to actuate the actuator motor so that the damper mass is adjusted to the selected longitudinal position.

[0025] The process enables automatic adjustment of the vibration absorber's natural frequency(ies) to different environmental conditions. This allows unwanted vibrations to be attenuated under different environmental conditions.

[0026] The vibration data may have been generated using a suitable sensor, for example using an inertial sensor for measuring an acceleration and / or rotation rate of the vibration-prone component with respect to one or more, preferably three, spatial axes.

[0027] A computer program comprising instructions that, when executed by the processor, cause a processor of the control unit to execute the method described above and below can be stored in the memory of the control unit. For example, a lookup table can also be stored in the memory of the control unit that assigns different longitudinal positions of the damper mass to different resonant frequency ranges of the vibration-prone component. Each longitudinal position can correspond to a specific natural frequency range of the vibration damper, which is suitably tuned to the respective resonant frequency range in order to enable the undesired vibrations of the vibration-prone component to be attenuated or even completely eliminated by corresponding counter-vibrations of the vibration damper.For example, the natural frequency range and the resonant frequency range may include at least partially the same frequencies.

[0028] Features of the method described above and below may also be features of the control unit (and vice versa).

[0029] A third aspect of the invention relates to a control unit with a processor configured to carry out the method described above and below. The control unit can comprise hardware and / or software modules. In addition to the processor, the control unit can comprise a memory and data communication interfaces for wireless and / or wired data communication with peripheral devices. The control unit can, for example, be a hardware and / or software component of a higher-level elevator control system. Alternatively, the control unit can be a hardware component of the car arrangement. If the double-decker elevator comprises several car arrangements, each car arrangement can, for example, comprise such a control unit as its own hardware component.

[0030] A fourth aspect of the invention relates to a double-deck elevator. The double-deck elevator comprises: a shaft; the elevator car assembly described above and below, wherein the elevator car frame is mounted in the shaft for displacement between multiple floors.

[0031] Embodiments of the invention may be considered, without limiting the invention, as being based on the ideas and findings described below.

[0032] According to one embodiment, the vibration-prone component can be a first of the elevator cars. During operation of the actuator, unwanted vibrations of the actuator and / or the car frame can be transmitted to one of the cars, in particular to the car driven by the actuator. By mechanically coupling the vibration damper to the relevant car, these vibrations can be dampened particularly effectively. Thus, disruptive vibrations and / or disturbing noises from the elevator car can be avoided, improving ride comfort.

[0033] According to one embodiment, the damper spring can be connected at its other end to a floor structure of the first car. This allows the vibration damper to be placed as close as possible to the center of gravity of the first car. This improves vibration damping compared to designs in which the vibration damper is placed further away from the center of gravity, for example, on a ceiling structure or side wall of the first car. The floor structure can be a load-bearing structure. The floor structure can therefore bear a large portion of the weight of the first car (for example, a cabin of the first car can rest on the floor structure).

[0034] According to one embodiment, the first car can be a lower one of the stacked cars and / or can be mechanically coupled to the actuator, i.e., can be displaced relative to the car frame by means of the actuator. Practical tests with a car arrangement in which the lower car is the car driven by the actuator have shown that this embodiment enables particularly effective vibration damping. The first and / or lower car can be mechanically coupled to the actuator, for example, via its floor structure.

[0035] According to one embodiment, the vibration-prone component can be the car frame or the actuator. In certain cases, for example due to space constraints, it may be expedient to attach the vibration damper to a component other than one of the cars. The car frame or the actuator is particularly suitable for this purpose, since a significant portion of the unwanted vibrations is usually transmitted from these components to other components of the car arrangement. For example, the actuator can be attached to the car frame and, depending on its rotational speed, oscillate at an excitation frequency that excites the car frame (and possibly one or each of the connected cars) to oscillate in an undesirable manner. This can be avoided by attaching the vibration damper to the actuator itself or to the car frame.

[0036] It is also conceivable that at least one first vibration damper is attached to one or each of the elevator cars, at least one second vibration damper is attached to the car frame, and at least one third vibration damper is attached to the actuator. According to one embodiment, the vibration-susceptible component can be a longitudinal member of the elevator car frame. In this case, the damper spring can be attached to the longitudinal member at its other end directly or indirectly, for example via a cantilever extending from the longitudinal member. The longitudinal member can, for example, have one or more car guide rails for guiding one or both of the elevator cars during displacement by means of the actuator.

[0037] It is also conceivable for the elevator car frame to comprise a guide section for guiding the elevator car frame along at least one guide rail anchored in the shaft during (vertical) displacement between floors. In this case, the damper spring can be connected to the guide section at its other end. The guide section can be formed, for example, by one or more, preferably two, vertical longitudinal beams which, when the elevator car arrangement is in operation, can be coupled to the guide rail (or rails), for example via guide shoes and / or rollers. When the elevator car frame is displaced in the shaft, unwanted vibrations can also be transmitted from the guide rail (or rails) via the guide section to the elevator car frame and from there to one or each of the elevator cars.The transmission of these additional vibrations via the car frame can be effectively prevented if the vibration absorber is attached to the guide section itself.

[0038] According to one embodiment, the damper mass can be movable between different longitudinal positions in the longitudinal direction of the damper spring. In this case, the vibration damper can further comprise a servomotor for adjusting the damper mass between the longitudinal positions. In other words, the servomotor can be designed to displace the damper mass and the damper spring relative to one another in the longitudinal direction of the damper spring. The servomotor can be electrically controlled by a control unit of the double-decker elevator. For example, the servomotor can be designed as an electric, hydraulic, or pneumatic drive, or a combination of at least two of these examples. This enables simple automatic adaptation of the natural frequency(ies) of the vibration damper to changes in the frequencies of the unwanted vibrations, for example when the speed of the actuator for displacing the elevator cars changes.

[0039] According to one embodiment, the damper spring can comprise a tubular section. The free end and the other end of the damper spring can be ends of the tubular section. In the simplest case, the damper spring can be formed by a single tube.

[0040] According to one embodiment, the damper mass can be formed by a body with an opening for the damper spring to pass through, for example, in the form of a tube. An inner contour of the opening can be adapted to an outer contour of the damper spring such that the body and the damper spring can be displaced relative to each other in the longitudinal direction of the damper spring with sufficient accuracy. This enables simple and precise adjustment of the longitudinal position of the damper mass (see also above).

[0041] The body can, for example, be cylindrical or disc-shaped and / or made of one or more pieces. For example, the body can be formed by a stack of several discs with central openings. This allows for easy adjustment of the weight of the damper mass by adding or removing individual discs. Furthermore, such a rotationally symmetrical design of the body ensures that the vibration damper behaves the same or similarly when vibrating in different vibration directions.

[0042] According to one embodiment, the free end of the damper spring can protrude vertically or horizontally from the vibration-prone component if the car frame is mounted so that it can move in the shaft between the floors.

[0043] In other words, the free end can protrude downwards or upwards, for example, from the floor structure of one of the elevator cars. In the first case, the damper mass hangs from the damper spring, while in the second case, it rests on the damper spring. The damper spring thus has a substantially vertical longitudinal direction.

[0044] Alternatively, the free end can protrude to the left or right, for example, toward or away from the center of the floor structure. In this case, the damper spring has a substantially horizontal longitudinal direction.

[0045] According to one embodiment, the elevator car arrangement may further comprise: a further vibration damper comprising an absorber mass and an elongated absorber spring, wherein the absorber mass is connected to a free end of the absorber spring and the absorber spring is connected at its other end to a vibration-prone component of the elevator car arrangement, wherein the absorber mass and the absorber spring are coordinated with one another such that the further vibration damper is set into desired vibrations during operation of the actuator, which counteract unwanted vibrations of the vibration-prone component, ie weaken or eliminate them.

[0046] The vibration absorber and the additional vibration absorber can preferably be of identical design.

[0047] The car arrangement may also include two or more vibration absorbers.

[0048] This allows multiple vibration dampers to be placed at several suitable locations within the car assembly. This can further improve the effectiveness of vibration damping.

[0049] According to one embodiment, the vibration absorber and the further vibration absorber (or the further vibration absorbers) can be attached to different locations on the same vibration-prone component.

[0050] For example, the various vibration absorbers can be evenly distributed around the center of gravity of the same vibration-prone component.

[0051] Alternatively, the different vibration absorbers can be connected to different vibration-prone components of the car assembly.

[0052] The various damper springs can, for example, be located in the same horizontal or vertical plane. Additionally or alternatively, the longitudinal axes of the damper springs can be aligned parallel to each other. A collinear arrangement of the longitudinal axes of the damper springs is also possible.

[0053] In addition, as mentioned above, the various damper springs can protrude from the respective component (or components) in opposite directions.

[0054] Thus, the effectiveness of vibration damping can be further improved.

[0055] According to one embodiment, the double-deck elevator may further comprise the control unit described above and below and a device for determining the current frequencies of the undesirable vibrations of the vibration-prone component of the elevator car assembly. This enables automatic adaptation of the vibration damper of the elevator car assembly to different environmental conditions.

[0056] Embodiments of the invention are described below with reference to the accompanying drawings. Neither the description nor the drawings are to be construed as limiting the invention.

[0057] Fig. 1 shows a double-deck elevator according to an embodiment of the invention.

[0058] Fig. 2 shows a side view of a car frame of a car arrangement according to an embodiment of the invention.

[0059] The drawings are purely schematic and not to scale. Identical reference symbols in different drawings indicate identical or equivalent features.

[0060] Fig. 1 shows components of a double-decker elevator 1. The double-decker elevator 1 comprises a car arrangement 2 consisting of a first car 3, a second car 4 and a car frame 5, which is mounted in a shaft 6 between several floors of a building so as to be displaceable in the direction of a vertical axis z.

[0061] Vertically running guide rails 7 can be anchored in the shaft 6, which guide the car frame 5 in the z-direction on one side or, as here, on both sides.

[0062] The elevator cars 3, 4 are arranged one above the other in the car frame 5 and separated by a vertical distance A. In this example, the first elevator car 3 is the lower of the two elevator cars 3, 4.

[0063] By moving the car frame 5 in the shaft 6 along the guide rails 7, the two cars 3, 4 can be moved together and thus stop simultaneously at two adjacent floors, ie directly above one another.

[0064] Floor heights can vary within a building. For example, the vertical distance between two adjacent floors may decrease with increasing building height, which can be particularly the case in high-rise buildings. The vertical distance A between the two elevator cars 3 and 4 should therefore be adjustable accordingly.

[0065] For this purpose, in this example, the lower, first car 3 is mounted on the car frame 5 so that it can be moved in the z-direction. The second car 4, on the other hand, is firmly connected to the car frame 5.

[0066] The vertical adjustment of the first elevator car 3 can be carried out, for example, by means of two (identical) spindle drives 8 as actuators, each comprising a spindle 9 and a drive unit 10 for driving, i.e. motor-driven rotation of the spindle 9. Each drive unit 10 can, for example, comprise an electric drive motor, a gear coupling the drive motor to the respective spindle 9, and spring-applied brakes. A spindle nut 11 is seated on each spindle 9, which here is connected to a supporting floor structure 12 of the first elevator car 3. By rotating the spindles 9, the spindle nuts 11 are moved in the longitudinal direction of the spindles 9, i.e. in the z-direction, whereby the first elevator car 3 is either lowered or raised depending on the direction of rotation, i.e. the distance A becomes larger or smaller.In this case, certain vibration-prone components of the car arrangement 2, in particular the lower, driven car 3, can be set into undesirable vibrations, which can manifest themselves in disturbing vibrations and / or disturbing noises.

[0067] To eliminate or mitigate these unwanted vibrations, the elevator car assembly 2 in this example further comprises a first vibration damper 13 and a second vibration damper 14, which are suspended downwards from the floor structure 12, similar to a pendulum. The first vibration damper 13 is attached to the left of the floor structure 12, and the second vibration damper 14 is attached to the right rear of the floor structure 12. The two vibration dampers 13, 14 are thus diagonally opposite each other and evenly distributed around a center of gravity of the lower elevator car 3, which contributes to the effectiveness of the vibration damping.

[0068] The vibration dampers 13, 14 can also be mounted vertically or horizontally and / or in different orientations on the floor structure 12 or another component susceptible to vibration, such as the car frame 5 (see Fig. 2).

[0069] The elevator car assembly 2 can comprise only one vibration damper or more than two, for example, at least four, at least six, or at least eight vibration dampers. Each vibration damper 13, 14 is formed by an elongated damper spring 15, for example, a simple tube, with a defined stiffness and a damper mass 16 with a defined weight. The damper mass 16 sits on a free end of the damper spring 15, while the other end of the damper spring 15 is attached to the floor structure 12, for example, by screwing or welding.

[0070] The absorber mass 16 can in particular be formed by a single-piece or multi-piece cylindrical body.

[0071] Each vibration damper 13, 14 is tuned—more precisely, the damper spring 15 and the damper mass 16 of each vibration damper 13, 14 are tuned to one another—so that when the spindle drives 8 are operating, i.e., when the electric motors of the drive units 10 rotate the spindles 9 at a specific speed, it oscillates at a specific natural frequency or with natural frequencies within a specific frequency range. These desired vibrations of the vibration dampers 13, 14 interact with the undesired vibrations in such a way that the undesired vibrations are noticeably attenuated, at least to the extent that no disturbing vibrations and / or disturbing noises can be perceived.

[0072] In order to tune the vibration dampers 13, 14, the respective damper mass 16 can, for example, be mounted in different longitudinal positions in the longitudinal direction of the respective damper spring 15, here in the z-direction.

[0073] It is particularly advantageous if the damper mass 16 is mounted on the damper spring 15 so that it can be moved between the longitudinal positions. In this case, the damper mass 16 can be adjusted between the longitudinal positions, for example, using an electric servomotor 17 (see Fig. 2). This enables automatic tuning of the vibration dampers 13, 14.

[0074] For this purpose, current frequencies or - additionally - other relevant properties of the unwanted vibrations, such as their amplitude, can be determined using a suitable vibration sensor 18, for example an inertial sensor arranged on the floor structure 12 or directly on the first car 3.

[0075] The vibration data 19 generated in this way are received by a control unit 20, which evaluates the vibration data 19 to determine a suitable longitudinal position for each damper mass 16 and generates a corresponding control command 21 for each actuator 17, causing it to adjust the respective damper mass 16 to the respective longitudinal position. The vibration dampers 13, 14 then generate desired vibrations that counteract the undesired vibrations according to the current frequencies.

[0076] Fig. 2 shows an alternative arrangement of the vibration dampers 13, 14 on the car frame 5, more precisely on a lateral guide section 22 of the car frame 5, which is formed here by two parallel longitudinal beams 23 of the car frame 5.

[0077] It is possible for the first car 3 to be mounted on one or both of the longitudinal beams 23 via one or more car guide rails (not shown) for displacement in the z-direction. If the first car 3 is mounted on both sides, as shown in Fig. 1, the car frame 5 can have such a guide section 22 on each of two opposite sides.

[0078] One of the vibration dampers 13, 14 is attached to each longitudinal member 23 via its respective damper spring 15. In this example, the first vibration damper 13 is mounted suspended, whereas the second vibration damper 14 is mounted vertically.

[0079] Each vibration damper 13, 14 is attached via its respective damping spring 15 to one of two arms 24, each of which protrudes from one of the longitudinal beams 23 and is attached to the respective longitudinal beam 23 via a fastening device 25. The fastening device 25 can be formed, for example, by a screw connection and / or welding.

[0080] The boom 24 of the second vibration damper 14 also includes a bearing device 26 (see also Fig. 1) that rotatably supports an upper end of the spindle 9. The second vibration damper 14 and the spindle 9 can be arranged on opposite sides of the boom 24, as here.

[0081] The outriggers 24 can be arranged at essentially the same height in the z-direction. However, the outriggers 24 can also have different positions in the z-direction.

[0082] Additionally or alternatively, at least one vibration damper 13, 14 can be attached to at least one of the spindle drives 18, for example to the drive unit 10.

[0083] Finally, it should be noted that terms such as "comprising," "including," "having," "including," etc., do not exclude other elements or steps, and indefinite articles such as "a" or "an" do not exclude a plurality. Furthermore, it should be noted that features or steps described with reference to one of the above embodiments may also be used in combination with features or steps described with reference to other of the above embodiments. Reference signs in the claims are not to be understood as limiting.

Claims

Claims 1. A car assembly for a double-decker elevator (1), the car assembly (2) comprising: a car frame (5) that can be displaceably mounted in a shaft (6) between several floors; two cars (3, 4) that are connected to the car frame (5) such that they can be displaced together with the car frame (5) and - when the car frame (5) is displaceably mounted in the shaft (6) between the floors - are arranged one above the other, wherein a distance (A) between the cars (3, 4) arranged one above the other can be adjusted by displacing the cars (3, 4) relative to one another by means of an actuator (8);a vibration damper (13) comprising a damper mass (16) and an elongated damper spring (15), wherein the damper mass (16) is connected to a free end of the damper spring (15) and the damper spring (15) is connected at its other end to a vibration-prone component (3, 4, 5, 8, 12, 22, 23) of the elevator car arrangement (2), wherein the damper mass (16) and the damper spring (15) are coordinated with one another such that the vibration damper (13) is set into desired vibrations during operation of the actuator (8), which counteract undesired vibrations of the vibration-prone component (3, 4, 5, 8, 12, 22, 23); 2. Elevator car arrangement according to claim 1, wherein the vibration-prone component (3, 4, 5, 8, 12, 22, 23) is a first (3) of the elevator cars (3, 4).

3. Elevator car arrangement according to claim 2, wherein the damper spring (15) is connected at its other end to a floor structure (12) of the first elevator car (3).

4. Elevator car arrangement according to claim 2 or 3, wherein the first car (3) is a lower one (3) of the elevator cars (3, 4) arranged one above the other and / or is mechanically coupled to the actuator (8).

5. Elevator car assembly according to claim 1, wherein the vibration-prone component (3, 4, 5, 8, 12, 22, 23) is the elevator car frame (5) or the actuator (8).

6. Elevator car arrangement according to claim 5, wherein the vibration-prone component (3, 4, 5, 8, 12, 22, 23) is a longitudinal member (23) of the elevator car frame (5).

7. Elevator car arrangement according to one of the preceding claims, wherein the damper mass (16) is movable between different longitudinal positions in the longitudinal direction (z) of the damper spring (15); wherein the vibration damper (13) further comprises a servomotor (17) for adjusting the damper mass (16) between the longitudinal positions.

8. Elevator car arrangement according to one of the preceding claims, wherein the damper spring (15) comprises a tubular section (15), wherein the free end and the other end of the damper spring (15) are ends of the tubular section (15); and / or wherein the damper mass (16) is formed by a body (16) with an opening for passing the damper spring (15).

9. Elevator car arrangement according to one of the preceding claims, wherein the free end of the damper spring (15) projects vertically or horizontally from the vibration-prone component (3, 4, 5, 8, 12, 22, 23) when the elevator car frame (5) is mounted displaceably in the shaft (6) between the floors.

10. Elevator car arrangement according to one of the preceding claims, further comprising: a further vibration damper (14) which comprises an absorber mass (16) and an elongated absorber spring (15), wherein the absorber mass (16) is connected to a free end of the absorber spring (15) and the absorber spring (15) is connected at its other end to a vibration-susceptible component (3, 4, 5, 8, 12, 22, 23) of the elevator car arrangement (2), wherein the absorber mass (16) and the absorber spring (15) are coordinated with one another such that the further vibration damper (14) is set into desired vibrations during operation of the actuator (8), which counteract undesired vibrations of the vibration-susceptible component (3, 4, 5, 8, 12, 22, 23).

11. Elevator car arrangement according to claim 10, wherein the vibration damper (13) and the further vibration damper (14) are attached to different locations of the same vibration-susceptible component (3, 4, 5, 8, 12, 22, 23).

12. A method for tuning a vibration damper (13, 14) of a car assembly (2) for a double-deck elevator (1), wherein the car assembly (2) is the car assembly (2) according to claim 7, the method comprising: Receiving vibration data (19) indicating current frequencies of the unwanted vibrations; Determining a selected longitudinal position from the various longitudinal positions between which the damper mass (16) is movable in the longitudinal direction (z) of the damper spring (15) using the vibration data (19), wherein the vibration damper (13, 14) has a natural frequency tuned to the current frequencies when the damper mass (16) is in the selected longitudinal position; Generating a control command (21) to control the servo motor (17) so that the damper mass (16) is adjusted to the selected longitudinal position.

13. A control unit comprising a processor configured to perform the method of claim 12.

14. A double-deck elevator comprising: a shaft (6); a car assembly (2) according to one of claims 1 to 11, wherein the car frame (5) is mounted in the shaft (6) for displacement between several floors.

15. A double-deck elevator according to claim 14, further comprising: the control unit (20) according to claim 13; a device (18) for determining the current frequencies of the undesirable vibrations.

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